UEFI Shell Specification
September 25, 2008
Revision 2.0

The material contained herein is not a license, either expressly or impliedly, to any intellectual property owned or controlled by any of the authors or developers of this material or to any contribution thereto. The material contained herein is provided on an "AS IS" basis and, to the maximum extent permitted by applicable law, this information is provided AS IS AND WITH ALL FAULTS, and the authors and developers of this material hereby disclaim all other warranties and conditions, either express, implied or statutory, including, but not limited to, any (if any) implied warranties, duties or conditions of merchantability, of fitness for a particular purpose, of accuracy or completeness of responses, of results, of workmanlike effort, of lack of viruses and of lack of negligence, all with regard to this material and any contribution thereto. Designers must not rely on the absence or characteristics of any features or instructions marked "reserved" or "undefined." The Unified EFI Forum, Inc. reserves any features or instructions so marked for future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to them. ALSO, THERE IS NO WARRANTY OR CONDITION OF TITLE, QUIET ENJOYMENT, QUIET POSSESSION, CORRESPONDENCE TO DESCRIPTION OR NON-INFRINGEMENT WITH REGARD TO THE SPECIFICATION AND ANY CONTRIBUTION THERETO. IN NO EVENT WILL ANY AUTHOR OR DEVELOPER OF THIS MATERIAL OR ANY CONTRIBUTION THERETO BE LIABLE TO ANY OTHER PARTY FOR THE COST OF PROCURING SUBSTITUTE GOODS OR SERVICES, LOST PROFITS, LOSS OF USE, LOSS OF DATA, OR ANY INCIDENTAL, CONSEQUENTIAL, DIRECT, INDIRECT, OR SPECIAL DAMAGES WHETHER UNDER CONTRACT, TORT, WARRANTY, OR OTHERWISE, ARISING IN ANY WAY OUT OF THIS OR ANY OTHER AGREEMENT RELATING TO THIS DOCUMENT, WHETHER OR NOT SUCH PARTY HAD ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. Copyright 2008 Unified EFI, Inc. All Rights Reserved

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Contents
1 Introduction .....................................................................................................1 1.1 1.2 1.3 2 Overview ..............................................................................................1 Related Information................................................................................1 Terms...................................................................................................1

Code Definitions ...............................................................................................3 2.1 2.2 Introduction ..........................................................................................3 EFI_SHELL_PROTOCOL............................................................................3 EFI_SHELL_PROTOCOL ...........................................................................3 EFI_SHELL_PROTOCOL.BatchIsActive() .....................................................8 EFI_SHELL_PROTOCOL.CloseFile()............................................................9 EFI_SHELL_PROTOCOL.CreateFile() ........................................................ 10 EFI_SHELL_PROTOCOL.DeleteFile() ........................................................12 EFI_SHELL_PROTOCOL.DeleteFileByName() ............................................. 13 EFI_SHELL_PROTOCOL.DisablePageBreak() .............................................14 EFI_SHELL_PROTOCOL.EnablePageBreak() ..............................................15 EFI_SHELL_PROTOCOL.Execute() ........................................................... 16 EFI_SHELL_PROTOCOL.FindFiles() .......................................................... 18 EFI_SHELL_PROTOCOL.FindFilesInDir() ................................................... 19 EFI_SHELL_PROTOCOL.FlushFile() .......................................................... 20 EFI_SHELL_PROTOCOL.FreeFileList() ......................................................21 EFI_SHELL_PROTOCOL.GetCurDir() ........................................................ 22 EFI_SHELL_PROTOCOL.GetDeviceName() ................................................ 23 EFI_SHELL_PROTOCOL.GetDevicePathFromMap() ..................................... 25 EFI_SHELL_PROTOCOL.GetDevicePathFromFilePath() ................................ 26 EFI_SHELL_PROTOCOL.GetEnv() ............................................................ 27 EFI_SHELL_PROTOCOL.GetFileInfo()....................................................... 28 EFI_SHELL_PROTOCOL.GetFilePathFromDevicePath() ................................ 29 EFI_SHELL_PROTOCOL.GetFilePosition().................................................. 30 EFI_SHELL_PROTOCOL.GetFileSize()....................................................... 31 EFI_SHELL_PROTOCOL.GetHelpText() .....................................................32 EFI_SHELL_PROTOCOL.GetMapFromDevicePath() ..................................... 34 EFI_SHELL_PROTOCOL.GetPageBreak() ..................................................35 EFI_SHELL_PROTOCOL.IsRootShell() ...................................................... 36 EFI_SHELL_PROTOCOL.OpenFileByName() ..............................................37 EFI_SHELL_PROTOCOL.OpenFileList() .....................................................39 EFI_SHELL_PROTOCOL.OpenRoot() ........................................................41 EFI_SHELL_PROTOCOL.OpenRootByHandle() ...........................................42 EFI_SHELL_PROTOCOL.ReadFile() ..........................................................43 EFI_SHELL_PROTOCOL.RemoveDupInFileList() ......................................... 44 EFI_SHELL_PROTOCOL.SetAlias()........................................................... 45 EFI_SHELL_PROTOCOL.SetCurDir() ........................................................46 EFI_SHELL_PROTOCOL.SetEnv() ............................................................ 47 EFI_SHELL_PROTOCOL.SetFileInfo() ....................................................... 48 EFI_SHELL_PROTOCOL.SetFilePosition()..................................................49 EFI_SHELL_PROTOCOL.SetMap()............................................................ 50 EFI_SHELL_PROTOCOL.WriteFile().......................................................... 51

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2.3 3

EFI_SHELL_PARAMETERS_PROTOCOL ..................................................... 52 EFI_SHELL_PARAMETERS_PROTOCOL ..................................................... 52 Levels Of Support.................................................................................55 Invocation...........................................................................................56 Initialization ........................................................................................57 3.3.1 Finding startup.nsh.................................................................. 58 3.3.2 Supported Profiles ...................................................................58 Command-Line .................................................................................... 58 3.4.1 Special Characters...................................................................59 3.4.2 Escape Characters ...................................................................59 3.4.3 Quoting ................................................................................. 59 3.4.4 Redirection............................................................................. 60 Current Directory .................................................................................62 Variables.............................................................................................62 3.6.1 Environment Variables ............................................................. 63 3.6.2 Positional Parameters ..............................................................65 3.6.3 Index Parameters....................................................................65 3.6.4 Aliases...................................................................................65 File Names ..........................................................................................66 3.7.1 Wildcard Expansion ................................................................. 66 3.7.2 Mappings ...............................................................................67 3.7.3 Consistent File System Mapping ................................................67 Scripts................................................................................................67 Nesting the Shell.................................................................................. 68 Interactive Features..............................................................................68 3.10.1 Key History Support ................................................................ 68 3.10.2 Execution Interrupt Support...................................................... 68 3.10.3 Output Streaming Control.........................................................69 3.10.4 Scroll Back Buffer Support ........................................................69 Shell Applications ................................................................................. 69 3.11.1 Installation............................................................................. 69 3.11.2 Command-Line Help ................................................................ 70 Comments ..........................................................................................71 Error Handling ..................................................................................... 71 Script Nesting ......................................................................................72 Output and Echoing ..............................................................................72 Limitations ..........................................................................................72

UEFI Shell Features .........................................................................................55 3.1 3.2 3.3

3.4

3.5 3.6

3.7

3.8 3.9 3.10

3.11

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Scripts ..........................................................................................................71 4.1 4.2 4.3 4.4 4.5

5

Shell Commands.............................................................................................73 5.1 Overview ............................................................................................ 73 5.1.1 Explanation of Command Description Layout ............................... 77 5.1.2 Shell Command-Line Options .................................................... 77 Shell Command Profiles.........................................................................78 Shell Commands ..................................................................................78 alias ............................................................................................ 78 attrib ............................................................................................ 81 bcfg ............................................................................................83 cd ............................................................................................86
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cls ............................................................................................88 comp ............................................................................................ 89 connect ............................................................................................91 cp ............................................................................................93 date ............................................................................................96 dblk ............................................................................................ 98 del .......................................................................................... 102 devices .......................................................................................... 103 devtree .......................................................................................... 105 dh .......................................................................................... 106 dir .......................................................................................... 109 disconnect ........................................................................................ 110 dmem .......................................................................................... 112 dmpstore .......................................................................................... 115 drivers .......................................................................................... 117 drvcfg .......................................................................................... 120 drvdiag .......................................................................................... 124 echo .......................................................................................... 126 edit .......................................................................................... 128 eficompress ...................................................................................... 129 efidecompress ................................................................................... 130 exit .......................................................................................... 131 for .......................................................................................... 132 getmtc .......................................................................................... 134 goto .......................................................................................... 135 guid .......................................................................................... 136 help .......................................................................................... 137 hexedit .......................................................................................... 139 if .......................................................................................... 140 ifconfig .......................................................................................... 145 ipconfig .......................................................................................... 147 load .......................................................................................... 148 loadpcirom........................................................................................ 150 ls .......................................................................................... 151 map .......................................................................................... 155 md .......................................................................................... 158 mem .......................................................................................... 159 memmap .......................................................................................... 160 mkdir .......................................................................................... 163 mm .......................................................................................... 165 mode .......................................................................................... 168 mv .......................................................................................... 170 openinfo .......................................................................................... 172 parse .......................................................................................... 173 pause .......................................................................................... 175 pci .......................................................................................... 176 ping .......................................................................................... 180 reconnect ......................................................................................... 181 reset .......................................................................................... 183 rm .......................................................................................... 184 sermode .......................................................................................... 186 set .......................................................................................... 188 setsize .......................................................................................... 190 setvar .......................................................................................... 191 shift .......................................................................................... 193
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smbiosview ....................................................................................... 194 stall .......................................................................................... 196 time .......................................................................................... 197 timezone .......................................................................................... 199 touch .......................................................................................... 201 type .......................................................................................... 202 unload .......................................................................................... 204 ver .......................................................................................... 205 vol .......................................................................................... 207 Appendix A UEFI Shell Consistent Mapping Design................................................................. 209 A.1 A.2 A.2.1 A.2.2 A.2.2.1 A.2.2.2 A.2.3 A.2.4 A.2.5 A.2.5.1 A.2.5.2 A.2.5.3 A.2.5.3.1 A.2.5.3.2 A.2.5.3.3 A.2.5.3.4 A.3 A.3.1 A.3.2 A.3.3 A.3.3.1 A.3.3.1.1 A.3.3.2 Requirement: ............................................................................................... 209 Design ........................................................................................................ 209 What does consistent mapping mean?.............................................................. 209 Hardware configuration change:...................................................................... 209 Hardware configuration change example .......................................................... 210 Hardware configuration not change example ..................................................... 210 Mapping generated from device path ............................................................... 210 Consistent Mapping ....................................................................................... 210 Example (USB Devices) ................................................................................. 211 Step 1: Determine MTD ................................................................................. 211 Step 2: Determine HI .................................................................................... 212 Step 3: Determine CSD ................................................................................. 213 Rules for USB device path node ...................................................................... 213 Rules for hard drive device path node .............................................................. 213 Corresponding CSDs...................................................................................... 213 Step 4: Make the whole mapping .................................................................... 213 Implementation ............................................................................................ 214 Get the MTD................................................................................................. 216 Get the HI ................................................................................................... 216 Get the CSD................................................................................................. 216 USB Devices ................................................................................................ 216 Example ...................................................................................................... 217 Floppy Devices ............................................................................................. 217

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A.3.3.2.1 A.3.3.3 A.3.3.4 A.3.3.4.1 A.3.3.5 A.3.3.6 A.3.3.7 A.3.3.7.1 A.3.3.8 A.3.3.8.1 A.3.3.9 A.3.3.10 A.3.3.11 A.3.3.12 A.3.3.13 A.3.3.14 A.3.3.15 A.3.3.16 A.3.3.17 A.4

Examples: ................................................................................................... 217 CSD of ATAPI device path node....................................................................... 217 CSD of LUN Device path node ......................................................................... 217 Examples: ................................................................................................... 217 CSD of SAS Device path node ......................................................................... 217 CSD of SATA Device path node ....................................................................... 217 CSD of hard drive device path node ................................................................. 217 Examples..................................................................................................... 218 CSD of SCSI device path node ........................................................................ 218 Examples: ................................................................................................... 218 Fibre Channel Device Path.............................................................................. 218 1394 Device Path.......................................................................................... 218 I2o Device Path ............................................................................................ 218 MAC Address Device Path............................................................................... 218 InfiniBand Device Path................................................................................... 218 UART Device Path ......................................................................................... 219 Vendor-Defined Device Path ........................................................................... 219 Vendor-defined Media Device Path................................................................... 219 File Path Media Device Path ............................................................................ 219 Function & Structure. .................................................................................... 219

Appendix B UEFI Help Manual Page Syntax........................................................................... 223 Appendix C UEFI Shell Status Codes.................................................................................... 225 Appendix D UEFI Shell Command Standard Formatted Output................................................. 227

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Tables
Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table Table 1 Support Levels .................................................................................... 55 2 Standard Command Line Options ........................................................... 56 3: UEFI Shell Invocation Options............................................................... 56 4 Output Redirection Syntax ....................................................................60 5 Input Redirection Syntax ...................................................................... 61 6 Input Redirection Syntax ...................................................................... 62 7 Environment Variables with Special Meaning to the UEFI Shell.................... 64 8 Built-in Aliases for the UEFI Shell ........................................................... 66 9 Wildcard Character Expansion................................................................ 67 10 Commands from Default Build Shell ......................................................74 11Standard Command Line Options...........................................................77 12Standard Profiles.................................................................................78 13 Conventions for Directory Names .........................................................86 14Date Command Table .......................................................................... 97 15 Standard-Format Output for devices ................................................... 103 16 dh Standard Formatted Output (HandlesInfo) ....................................... 108 17 Variable command line options........................................................... 115 18 Drivers command table ..................................................................... 118 19Comparison Operators ....................................................................... 142 20Functions used to convert integers into UEFI, PI or OEM error codes......... 142 21 Boolean Functions ............................................................................ 143 22 ls Standard Formatted Output (VolumeInfo)......................................... 153 23 ls Standard Formatted Output (FileInfo) .............................................. 153 24 Standard Formatted Output (Mappings)............................................... 157 25 Standard-Format Output for memmap (MemoryMap) ............................ 161 26 Standard-Format Output for memmap (Summary)................................ 162 27 Open Protocol Information Layout....................................................... 172 28 How to process each type the device path node:................................... 214 29 MTD Naming ................................................................................... 216 30 Subheadings and descriptions ............................................................ 223 31 SHELL_STATUS return codes ............................................................. 225

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Revision History
Revision Number 2.0 Initial UEFI release Description Revision Date 9/25/08

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1 Introduction
1.1 Overview
The UEFI Shell environment provides an API, a command prompt and a rich set of commands that extend and enhance the UEFI Shell’s capability.

1.2

Related Information
The following publications and sources of information may be useful or are referred to by this document: Extensible Firmware Interface Specification, Version 1.10, Intel, 2001, http://developer.intel.com/technology/efi. Unified Extensible Firmware Interface Specification, Version 2.0, Unified EFI, Inc, 2006, http://www.uefi.org. Intel® Platform Innovation Framework for EFI Specifications, Intel, 2006, http://www.intel.com/technology/framework/.

1.3

Terms
EFI Generic term that refers to one of the versions of the EFI specification: EFI 1.02, EFI 1.10, or UEFI 2.0. EFI 1.10 Specification Intel Corporation published the Extensible Firmware Interface Specification. It has been supplanted by the Unified Extensible Firmware Interface (UEFI), which is controlled by the UEFI Forum. GUID Globally Unique Identifier. A 128-bit value used to name entities uniquely. Without the help of a centralized authority, an individual can generate a unique GUID. This allows the generation of names that will never conflict, even among multiple, unrelated parties. Protocol An API named by a GUID as defined by the UEFI specification.

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UEFI Application An application following the UEFI specification. The only difference between a UEFI application and a UEFI driver is that an application is unloaded from memory when it exits regardless of return status, while a driver that returns a successful return status is not unloaded when its entry point exits. UEFI Driver A driver following the UEFI specification driver model. UEFI Specification Version 2.0 The first UEFI specification released by the Unified EFI Forum. UEFI Specification Version 2.1 Current version of the UEFI specification released by the Unified EFI Forum. Unified EFI Forum A non-profit collaborative trade organization formed to promote and manage the UEFI standard. For more information, see www.uefi.org.

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2 Code Definitions
2.1 2.2 Introduction
Formatted: Bullets and Numbering

EFI_SHELL_PROTOCOL

EFI_SHELL_PROTOCOL
Summary
Provides shell services to UEFI applications.

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GUID
#define EFI_SHELL_PROTOCOL_GUID \ { 0x6302d008, 0x7f9b, 0x4f30, \ { 0x87, 0xac, 0x60, 0xc9, 0xfe, 0xf5, 0xda, 0x4e } }

Protocol Interface Structure typedef struct _EFI_SHELL_PROTOCOL { EFI_SHELL_EXECUTE EFI_SHELL_GET_ENV EFI_SHELL_SET_ENV EFI_SHELL_SET_ALIAS EFI_SHELL_GET_HELP_TEXT EFI_SHELL_GET_DEVICE_PATH_FROM_MAP EFI_SHELL_GET_MAP_FROM_DEVICE_PATH EFI_SHELL_GET_DEVICE_PATH_FROM_FILE_PATH EFI_SHELL_GET_FILE_PATH_FROM_DEVICE_PATH EFI_SHELL_SET_MAP EFI_SHELL_GET_CUR_DIR EFI_SHELL_SET_CUR_DIR EFI_SHELL_OPEN_FILE_LIST EFI_SHELL_FREE_FILE_LIST EFI_SHELL_REMOVE_DUP_IN_FILE_LIST EFI_SHELL_BATCH_IS_ACTIVE EFI_SHELL_IS_ROOT_SHELL EFI_SHELL_ENABLE_PAGE_BREAK EFI_SHELL_DISABLE_PAGE_BREAK EFI_SHELL_GET_PAGE_BREAK EFI_SHELL_GET_DEVICE_NAME EFI_SHELL_GET_FILE_INFO EFI_SHELL_SET_FILE_INFO EFI_SHELL_OPEN_FILE_BY_NAME EFI_SHELL_CLOSE_FILE EFI_SHELL_CREATE_FILE EFI_SHELL_READ_FILE EFI_SHELL_WRITE_FILE EFI_SHELL_DELETE_FILE EFI_SHELL_DELETE_FILE_BY_NAME EFI_SHELL_GET_FILE_POSITION EFI_SHELL_SET_FILE_POSITION EFI_SHELL_FLUSH_FILE EFI_SHELL_FIND_FILES EFI_SHELL_FIND_FILES_IN_DIR EFI_SHELL_GET_FILE_SIZE EFI_SHELL_OPEN_ROOT EFI_SHELL_OPEN_ROOT_BY_HANDLE EFI_EVENT UINT32 UINT32 } EFI_SHELL_PROTOCOL; Execute; GetEnv; SetEnv; SetAlias; GetHelpText; GetDevicePathFromMap; GetMapFromDevicePath; GetDevicePathFromFilePath; GetFilePathFromDevicePath; SetMap; GetCurDir; SetCurDir; OpenFileList; FreeFileList; RemoveDupInFileList; BatchIsActive; IsRootShell; EnablePageBreak; DisablePageBreak; GetPageBreak; GetDeviceName; GetFileInfo; SetFileInfo; OpenFileByName; CloseFile; CreateFile; ReadFile; WriteFile; DeleteFile; DeleteFileByName; GetFilePosition; SetFilePosition; FlushFile; FindFiles; FindFilesInDir; GetFileSize; OpenRoot; OpenRootByHandle; ExecutionBreak; MajorVersion; MinorVersion;

Members
Execute

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Causes the shell to parse and execute the command line. See the Execute() function description below. GetEnv Gets the environment variable. See the GetEnv() function description below. SetEnv Changes a specific environment variable. Set the SetEnv() function description below. SetAlias Adds or removes the alias for a specific shell command. See the SetAlias() function description below. GetDevicePathFromMap Returns the device path that corresponds to a mapping. See the GetDevicePathFromMap() function description below. GetMapFromDevicePath Returns the mapping that corresponds to a particular device path. See the GetMapFromDevicePath() function description below. GetDevicePathFromFilePath Converts a file path to a device path, where all mappings have been replaced with the corresponding device paths. GetFilePathFromDevicePath Converts a device path to a file path, where the portion of the device path corresponding to one of the mappings is replaced with that mapping. SetMap Creates, updates or deletes a mapping between a device and a device path. GetCurDir Returns the current directory on a device. See the GetCurDir() function description below. SetCurDir Changes the current directory on a device. Set the SetCurDir() function description below. OpenFileList Opens the files that match the path pattern specified. See the OpenFileList() function description below. FreeFileList Frees the file list that created by OpenFileList(). See the FreeFileList() function description below. RemoveDupInFileList Deletes the duplicate files in the given file list. See the RemoveDupInFileList() function description below. BatchIsActive Returns whether any script files are currently being processed. See the BatchIsActive() function description below.
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IsRootShell Judges whether the active Shell is the root shell. See the IsRootShell() function description below. EnablePageBreak Enables the page break output mode. See the EnablePageBreak() function description below. DisablePageBreak Disables the page break output mode. See the DisablePageBreak() function description below. GetPageBreak Gets the enable status of the page break output mode. See the GetPageBreak() function description below. GetDeviceName Gets the name of the device specified by the device handle. See the GetDeviceName() function description below. GetFileInfo Return information about a specific file handle. See the GetFileInfo() function description below. SetFileInfo Change information about a specific file handle. See the SetFileInfo() function description below. OpenFileByName Given a file name, open a file and return a file handle. See the OpenFileByName() description below. CloseFile Close an open file. See the CloseFile() description below. CreateFile Create a new file. See the CreateFile() function description. ReadFile Read data from a file. See the ReadFile() function description. WriteFile Write data to a file. See the WriteFile() function description. DeleteFile Delete a file. See the DeleteFile() function description. DeleteFileByName Delete a file by name. See the DeleteFileByName() function description. SetFilePosition Change the current read/write position within a file. See the SetFilePosition() function description.

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GetFilePosition Return the current read/write position within a file. See the GetFilePosition() function description. FlushFile Write all buffered data to a file. See the FlushFile() function description. FindFiles Return all files that match a pattern in a file list. See the FindFiles() function description. FindFilesInDir Return all files in a specified directory in a file list. See the FindFilesInDir() function description. GetFileSize Return the size of a file. See the GetFileSize() function description. OpenRoot Return the root directory of a file system. See the OpenRoot() function description. OpenRootByHandle Return the root directory of a file system on a particular handle. See the OpenRootByHandle() function description. ExecutionBreak Event signaled by the UEFI Shell when the user presses CTRL-C to indicate that the current UEFI Shell command execution should be interrupted. MajorVersion The major version of the shell environment. MinorVersion The minor version of the shell environment.

Description
Description that is more detailed goes here.

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EFI_SHELL_PROTOCOL.BatchIsActive()
Summary
Returns whether any script files are currently being processed.

Prototype typedef BOOLEAN (EFIAPI *EFI_SHELL_BATCH_IS_ACTIVE) ( VOID );

Parameters
None

Description
This function tells whether any script files are currently being processed

Status Codes Returned
TRUE FALSE
There is at least one script file active. No script files are active now.

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EFI_SHELL_PROTOCOL.CloseFile()
Summary
Closes the file handle.

Prototype typedef EFI_STATUS (EFIAPI *EFI_SHELL_CLOSE_FILE)( IN EFI_FILE_HANDLE FileHandle );

Parameters
FileHandle The file handle to be closed

Description
This function closes a specified file handle. All “dirty” cached file data is flushed to the device, and the file is closed. In all cases, the handle is closed.

Status Codes Returned
EFI_SUCCESS
The file is closed successfully

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EFI_SHELL_PROTOCOL.CreateFile()
Summary
Creates a file or directory by name.

Prototype typedef EFI_STATUS (EFIAPI *EFI_SHELL_CREATE_FILE)( IN CONST CHAR16 *FileName, IN UINT64 FileAttribs, OUT EFI_FILE_HANDLE *FileHandle );

Parameters
FileName Points to the null-terminated file path. FileAttribs The new file’s attributes. The different attributes are described in EFI_FILE_PROTOCOL.Open(). FileHandle On return, points to the created file or directory’s handle.

Description
This function creates an empty new file or directory with the specified attributes and returns the new file’s handle. If the file already exists and is read-only, then EFI_INVALID_PARAMETER will be returned. If the file already existed, it is truncated and its attributes updated. If the file is created successfully, the FileHandle is the file’s handle, else, the FileHandle is NULL. If the file name begins with >v, then the file handle which is returned refers to the shell environment variable with the specified name. If the shell environment variable already exists and is non-volatile then EFI_INVALID_PARAMETER is returned.

Status Codes Returned
EFI_SUCCESS EFI_INVALID_PARAMETER EFI_UNSUPPORTED EFI_NOT_FOUND EFI_NO_MEDIA
The file was opened. FileHandle points to the new file’s handle. One of the parameters has an invalid value. Could not open the file path. The specified file could not be found on the device, or could not find the file system on the device. The device has no medium.

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EFI_MEDIA_CHANGED EFI_DEVICE_ERROR EFI_VOLUME_CORRUPTED EFI_WRITE_PROTECTED EFI_ACCESS_DENIED EFI_OUT_OF_RESOURCES EFI_VOLUME_FULL

The device has a different medium in it or the medium is no longer supported. The device reported an error or can’t get the file path according the DirName. The file system structures are corrupted. An attempt was made to create a file, or open a file for write when the media is write-protected. The service denied access to the file. Not enough resources were available to open the file. The volume is full.

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EFI_SHELL_PROTOCOL.DeleteFile()
Summary
Deletes the file specified by the file handle.

Prototype typedef EFI_STATUS (EFIAPI *EFI_SHELL_DELETE_FILE)( IN EFI_FILE_HANDLE FileHandle );

Parameters
FileHandle The file handle to delete.

Description
This function closes and deletes a file. In all cases, the file handle is closed. If the file cannot be deleted, the warning code EFI_WARN_DELETE_FAILURE is returned, but the handle is still closed.

Status Codes Returned
EFI_SUCCESS EFI_WARN_DELETE_FAILURE
The file was closed and deleted, and the handle was closed. The handle was closed but the file was not deleted.

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EFI_SHELL_PROTOCOL.DeleteFileByName()
Summary
Deletes the file specified by the file handle.

Prototype typedef EFI_STATUS (EFIAPI *EFI_SHELL_DELETE_FILE_BY_NAME)( IN CONST CHAR16 *FileName );

Parameters
FileName Points to the null-terminated file name.

Description
This function deletes a file.

Status Codes Returned
EFI_SUCCESS The file was closed and deleted, and the handle was closed. The handle was closed but the file was not deleted.

EFI_WARN_DELETE_FAILURE

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EFI_SHELL_PROTOCOL.DisablePageBreak()
Summary
Disables the page break output mode.

Prototype typedef VOID (EFIAPI *EFI_SHELL_DISABLE_PAGE_BREAK) ( VOID );

Parameters
None

Description
This function disables the page break output mode.

Status Codes Returned
None

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EFI_SHELL_PROTOCOL.EnablePageBreak()
Summary
Enables the page break output mode.

Prototype typedef VOID (EFIAPI *EFI_SHELL_ENABLE_PAGE_BREAK) ( VOID );

Parameters
None

Description
This function enables the page break output mode.

Status Codes Returned
None

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EFI_SHELL_PROTOCOL.Execute()
Summary
Execute the command line.

Prototype typedef EFI_STATUS (EFIAPI *EFI_SHELL_EXECUTE) ( IN EFI_HANDLE *ParentImageHandle, IN CHAR16 *CommandLine OPTIONAL, IN CHAR16 **Environment OPTIONAL, OUT EFI_STATUS *StatusCode OPTIONAL );

Parameters
ParentImageHandle A handle of the image that is executing the specified command line. CommandLine Points to the null-terminated UCS-2 encoded string containing the command line. If NULL then the command-line will be empty. Environment Points to a null-terminated array of environment variables with the format ‘x=y’, where x is the environment variable name and y is the value. If this is NULL, then the current shell environment is used. ErrorCode Points to the status code returned by the command.

Description
This function creates a nested instance of the shell and executes the specified command (CommandLine) with the specified environment (Environment). Upon return, the status code returned by the specified command is placed in StatusCode. If Environment is NULL, then the current environment is used and all changes made by the commands executed will be reflected in the current environment. If the Environment is non-NULL, then the changes made will be discarded. The CommandLine is executed from the current working directory on the current device.

Status Codes Returned
EFI_SUCCESS
The command executed successfully. The status code returned by the command is

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pointed to by StatusCode.

EFI_INVALID_PARAMETER EFI_OUT_OF_RESOURCES EFI_UNSUPPORTED

The parameters are invalid. Out of resources. Nested shell invocations are not allowed.

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EFI_SHELL_PROTOCOL.FindFiles()
Summary
Find files that match a specified pattern.

Prototype typedef EFI_STATUS (EFIAPI *EFI_SHELL_FIND_FILES)( IN CONST CHAR16 *FilePattern, OUT EFI_SHELL_FILE_INFO **FileList );

Parameters
FilePattern Points to a null-terminated shell file path, including wildcards. FileList On return, points to the start of a file list containing the names of all matching files or else points to NULL if no matching files were found.

Description
This function searches for all files and directories that match the specified FilePattern. The FilePattern can contain wild-card characters. The resulting file information is placed in the file list FileList. The files in the file list are not opened. The OpenMode field is set to 0 and the FileInfo field is set to NULL.

Status Codes Returned
EFI_SUCCESS EFI_NOT_FOUND EFI_NO_MEDIA EFI_DEVICE_ERROR EFI_VOLUME_CORRUPTED
Files found. No files found. The device has no media The device reported an error The file system structures are corrupted

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EFI_SHELL_PROTOCOL.FindFilesInDir()
Summary
Find all files in a specified directory.

Prototype typedef EFI_STATUS (EFIAPI *EFI_SHELL_FIND_FILES_IN_DIR)( IN EFI_FILE_HANDLE FileDirHandle, OUT EFI_SHELL_FILE_INFO **FileList );

Parameters
FileDirHandle Handle of the directory to search. FileList On return, points to the list of files in the directory or NULL if there are no files in the directory.

Status Codes Returned
EFI_SUCCESS EFI_VOLUME_CORRUPTED EFI_DEVICE_ERROR EFI_NO_MEDIA
File information was returned successfully. The file system structures have been corrupted. The device reported an error. The device media is not present.

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EFI_SHELL_PROTOCOL.FlushFile()
Summary
Flushes data back to a device

Prototype typedef EFI_STATUS (EFIAPI *EFI_SHELL_FLUSH_FILE)( IN EFI_FILE_HANDLE FileHandle );

Parameters
FileHandle The handle of the file to flush.

Description
This function flushes all modified data associated with a file to a device.

Status Codes Returned
EFI_SUCCESS EFI_NO_MEDIA EFI_DEVICE_ERROR EFI_VOLUME_CORRUPTED EFI_WRITE_PROTECTED EFI_ACCESS_DENIED EFI_VOLUME_FULL
The data was flushed. The device has no medium. The device reported an error. The file system structures are corrupted. The file or medium is write-protected. The file was opened read-only. The volume is full.

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EFI_SHELL_PROTOCOL.FreeFileList()
Summary
Frees the file list.

Prototype typedef EFI_STATUS (EFIAPI *EFI_SHELL_FREE_FILE_LIST) ( IN EFI_SHELL_FILE_INFO **FileList );

Parameters
FileList The file list to free. Type EFI_SHELL_FILE_INFO is defined in OpenFileList()

Description
This function cleans up the file list and any related data structures. It has no impact on the files themselves.

Status Codes Returned
EFI_SUCCESS
Free the file list successfully.

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EFI_SHELL_PROTOCOL.GetCurDir()
Summary
Returns the current directory on the specified device.

Prototype typedef CONST CHAR16 * (EFIAPI *EFI_SHELL_GET_CUR_DIR) ( IN CONST CHAR16 *FileSystemMapping OPTIONAL );

Parameters
FileSystemMapping A pointer to the file system mapping. If NULL, then the current working directory is returned.

Description
If FileSystemMapping is NULL, it returns the current working directory. If the FileSystemMapping is not NULL, it returns the current directory associated with the FileSystemMapping. In both cases, the returned name includes the file system mapping (i.e. fs0:\current-dir). For more information, see “Current Directory”, section3.5.

Status Codes Returned
≠NULL NULL The current directory. Current directory does not exist.

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EFI_SHELL_PROTOCOL.GetDeviceName()
Summary
Gets the name of the device specified by the device handle.

Prototype typedef EFI_STATUS (*EFI_SHELL_GET_DEVICE_NAME) ( IN EFI_HANDLE IN EFI_SHELL_DEVICE_NAME_FLAGS IN CHAR8 OUT CHAR16 );

DeviceHandle, Flags, *Language, **BestDeviceName

Parameters
DeviceHandle The handle of the device. Flags Determines the possible sources of component names. See “Related Definitions” below for more information. Language A pointer to the language specified for the device name, in the same format as described in the UEFI specification, Appendix M BestDeviceName On return, points to the callee-allocated null-terminated name of the device. If no device name could be found, points to NULL. The name must be freed by the caller..

Description
This function gets the user-readable name of the device specified by the device handle. If no user-readable name could be generated, then *BestDeviceName will be NULL and EFI_NOT_FOUND will be returned. The

Related Definitions typedef UINT32 EFI_DEVICE_NAME_FLAGS; #define EFI_DEVICE_NAME_USE_COMPONENT_NAME 0x00000001 #define EFI_DEVICE_NAME_USE_DEVICE_PATH 0x00000002 If EFI_DEVICE_NAME_USE_COMPONENT_NAME is set, then the function will return the device’s name using the EFI_COMPONENT_NAME2_PROTOCOL, if present on DeviceHandle.

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If EFI_DEVICE_NAME_USE_DEVICE_PATH is set, then the function will return the device’s name using the EFI_DEVICE_PATH_PROTOCOL, if present on DeviceHandle. If both EFI_DEVICE_NAME_USE_COMPONENT_NAME and EFI_DEVICE_NAME_USE_DEVICE_PATH are set, then EFI_DEVICE_NAME_USE_COMPONENT_NAME will have higher priority.

Status Codes Returned
EFI_SUCCESS EFI_NOT_FOUND Get the name successfully. Fail to get the device name.

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EFI_SHELL_PROTOCOL.GetDevicePathFromMap()
Summary
Gets the device path from the mapping.

Prototype typedef CONST EFI_DEVICE_PATH_PROTOCOL * (EFIAPI *EFI_SHELL_GET_DEVICE_PATH_FROM_MAP) ( IN CONST CHAR16 *Mapping );

Parameters
Mapping A pointer to the mapping.

Description
This function gets the device path associated with a mapping.

Status Codes Returned
≠NULL NULL Pointer to the device path that corresponds to the device mapping. The returned pointer does not need to be freed. There is no device path associated with the specified mapping.

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EFI_SHELL_PROTOCOL.GetDevicePathFromFilePath()
Summary
Converts a file system style name to a device path.

Prototype typedef EFI_DEVICE_PATH_PROTOCOL * (EFIAPI *EFI_SHELL_GET_DEVICE_PATH_FROM_FILE_PATH) ( IN CONST CHAR16 *Path );

Parameters
Path The pointer to the path.

Description
This function converts a file system style name to a device path, by replacing any mapping references to the associated device path.

Status Codes Returned
The pointer of the file path. The file path is callee allocated and should be freed by the caller.

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EFI_SHELL_PROTOCOL.GetEnv()
Summary
Gets the environment variable.

Prototype typedef CONST CHAR16 * (EFIAPI *EFI_SHELL_GET_ENV) ( IN CONST CHAR16 *Name );

Parameters
Name A pointer to the environment variable name.

Description
This function returns the current value of the specified environment variable.

Status Codes Returned
≠NULL NULL The environment variable’s value. The returned pointer does not need to be freed by the caller. The environment variable doesn’t exist.

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EFI_SHELL_PROTOCOL.GetFileInfo()
Summary
Gets the file information from an open file handle.

Prototype typedef EFI_FILE_INFO * (EFIAPI *EFI_SHELL_GET_FILE_INFO)( IN EFI_FILE_HANDLE FileHandle );

Parameters
FileHandle A file handle

Description
This function allocates a buffer to store the file’s information. It’s the caller’s responsibility to free the buffer.

Returns
≠NULL NULL Cannot get the file info. A pointer to a buffer with file information.

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EFI_SHELL_PROTOCOL.GetFilePathFromDevicePath()
Summary
Converts a device path to a file system-style path.

Prototype typedef CHAR16 * (EFIAPI *EFI_SHELL_GET_FILE_PATH_FROM_DEVICE_PATH) ( IN CONST EFI_DEVICE_PATH_PROTOCOL *Path );

Parameters
Path The pointer to the device path.

Description
This function converts a device path to a file system path by replacing part, or all, of the device path with the file-system mapping. If there are more than one application file system mappings, the one that most closely matches Path will be used.

Returned Value
The pointer of the null-terminated file path. The path is callee-allocated and should be freed by the caller.

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EFI_SHELL_PROTOCOL.GetFilePosition()
Summary
Gets a file’s current position

Prototype typedef EFI_STATUS (EFIAPI *EFI_SHELL_GET_FILE_POSITION)( IN EFI_FILE_HANDLE FileHandle, OUT UINT64 *Position );

Parameters
FileHandle The file handle on which to get the current position. Position Byte position from the start of the file

Description
This function returns the current file position for the file handle. For directories, the current file position has no meaning outside of the file system driver and as such, the operation is not supported.

Status Codes Returns
EFI_SUCCESS EFI_UNSUPPORTED
Data was accessed. The request is not valid on open directories.

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EFI_SHELL_PROTOCOL.GetFileSize()
Summary
Gets the size of a file.

Prototype typedef EFI_STATUS (EFIAPI *EFI_SHELL_GET_FILE_SIZE)( IN EFI_FILE_HANDLE FileHandle, OUT UINT64 *Size );

Parameters
FileHandle The handle of the file. Size The size of this file.

Description
This function returns the size of the file specified by FileHandle.

Status Codes Returned
EFI_SUCCESS EFI_DEVICE_ERROR
Get the file’s size. Can’t access the file.

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EFI_SHELL_PROTOCOL.GetHelpText()
Summary
Return help information about a specific command.

Prototype typedef EFI_STATUS (EFIAPI *EFI_SHELL_GET_HELP_TEXT) ( IN CONST CHAR16 *Command, IN CONST CHAR16 *Sections, OUT CHAR16 **HelpText );

Parameters
Command Points to the null-terminated UEFI Shell command name. Sections Points to the null-terminated comma-delimited section names to return. If NULL, then all sections will be returned. HelpText On return, points to a callee-allocated buffer containing all specified help text.

Description
This function returns the help information for the specified command. The help text can be internal to the shell or can be from a UEFI Shell manual page, as described in Appendix B If Sections is specified, then each section name listed will be compared in a casesensitive manner, to the section names described in Appendix B. If the section exists, it will be appended to the returned help text. If the section does not exist, no information will be returned. If Sections is NULL, then all help text information available will be returned.

Status Codes Returned
EFI_SUCCESS EFI_OUT_OF_RESOURCES EFI_INVALID_PARAMETER EFI_NOT_FOUND
The help text was returned. The necessary buffer could not be allocated to hold the returned help text.

HelpText is NULL
There is no help text available for Command.

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EFI_SHELL_PROTOCOL.GetMapFromDevicePath()
Summary
Gets the mapping that most closely matches the device path.

Prototype typedef CONST CHAR16 * (EFIAPI *EFI_SHELL_GET_MAP_FROM_DEVICE_PATH) ( IN OUT EFI_DEVICE_PATH_PROTOCOL **DevicePath );

Parameters
DevicePath On entry, points to a device path pointer. On exit, updates the pointer to point to the portion of the device path after the mapping.

Description
This function gets the mapping which corresponds to the device path *DevicePath. If there is no exact match, then the mapping which most closely matches *DevicePath is returned, and *DevicePath is updated to point to the remaining portion of the device path. If there is an exact match, the mapping is returned and *DevicePath points to the end-of-device-path node.

Returned Value
!NULL NULL Pointer to null-terminated mapping. The buffer is calleeallocated and should be freed by the caller. No mapping was found.

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EFI_SHELL_PROTOCOL.GetPageBreak()
Summary
Gets the enable status of the page break output mode.

Prototype typedef BOOLEAN (EFIAPI *EFI_SHELL_GET_PAGE_BREAK) ( VOID );

Parameters
None

Description
User can use this function to determine current page break mode.

Status Codes Returned
TRUE FALSE The page break output mode is enabled The page break output mode is disabled

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EFI_SHELL_PROTOCOL.IsRootShell()
Summary
Judges whether the active shell is the root shell.

Prototype typedef BOOLEAN (EFIAPI *EFI_SHELL_IS_ROOT_SHELL) ( VOID );

Parameters
None

Description
This function makes the user to know that whether the active Shell is the root shell.

Status Codes Returned
TRUE FALSE The active Shell is the root Shell. The active Shell is NOT the root Shell.

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EFI_SHELL_PROTOCOL.OpenFileByName()
Summary
Opens a file or a directory by file name.

Prototype typdef EFI_STATUS (EFIAPI *EFI_SHELL_OPEN_FILE_BY_NAME) ( IN CONST CHAR16 *FileName, OUT EFI_FILE_HANDLE *FileHandle, IN UINT64 OpenMode );

Parameters
FileName Points to the null-terminated UCS-2 encoded file name. FileHandle On return, points to the file handle. OpenMode File open mode. Either EFI_FILE_MODE_READ or EFI_FILE_MODE_WRITE from section 12.4 of the UEFI Specification.

Related Definitions typedef VOID *EFI_FILE_HANDLE;

Description
This function opens the specified file in the specified OpenMode and returns a file handle. If the file name begins with >v, then the file handle which is returned refers to the shell environment variable with the specified name. If the shell environment variable exists, is non-volatile and the OpenMode indicates EFI_FILE_MODE_WRITE, then EFI_INVALID_PARAMETER is returned. If the file name is >i, then the file handle which is returned refers to the standard input. If the OpenMode indicates EFI_FILE_MODE_WRITE, then EFI_INVALID_PARAMETER is returned. If the file name is >o, then the file handle which is returned refers to the standard output. If the OpenMode indicates EFI_FILE_MODE_READ, then EFI_INVALID_PARAMETER is returned. If the file name is >e, then the file handle which is returned refers to the standard error. If the OpenMode indicates EFI_FILE_MODE_READ, then EFI_INVALID_PARAMETER is returned.

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If the file name is NUL, then the file handle that is returned refers to the standard NUL file. If the OpenMode indicates EFI_FILE_MODE_READ, then EFI_INVALID_PARAMETER is returned. If return EFI_SUCCESS, the FileHandle is the opened file’s handle, else, the FileHandle is NULL.

Status Codes Returned
EFI_SUCCESS EFI_INVALID_PARAMETER EFI_UNSUPPORTED EFI_NOT_FOUND EFI_NO_MEDIA EFI_MEDIA_CHANGED EFI_DEVICE_ERROR EFI_VOLUME_CORRUPTED EFI_WRITE_PROTECTED EFI_ACCESS_DENIED EFI_OUT_OF_RESOURCES EFI_VOLUME_FULL
The file was opened. FileHandle has the opened file’s handle. One of the parameters has an invalid value. FileHandle is NULL. Could not open the file path. FileHandle is NULL. The specified file could not be found on the device or the file system could not be found on the device. FileHandle is NULL. The device has no medium. FileHandle is NULL. The device has a different medium in it or the medium is no longer supported. FileHandle is NULL. The device reported an error or can’t get the file path according the FileName. FileHandle is NULL. The file system structures are corrupted. FileHandle is NULL. An attempt was made to create a file, or open a file for write when the media is write-protected. FileHandle is NULL. The service denied access to the file. FileHandle is NULL. Not enough resources were available to open the file. FileHandle is NULL. The volume is full. FileHandle is NULL.

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EFI_SHELL_PROTOCOL.OpenFileList()
Summary
Opens the files that match the path specified.

Prototype typedef EFI_STATUS (EFIAPI *EFI_SHELL_OPEN_FILE_LIST) ( IN CHAR16 *Path, IN UINT64 OpenMode, IN OUT EFI_SHELL_FILE_INFO **FileList );

Parameters
Path A pointer to the path string. OpenMode Specifies the mode used to open each file, EFI_FILE_MODE_READ or EFI_FILE_MODE_WRITE. FileList Points to the start of a list of files opened.

Description
This function opens all of the files specified by Path. Wildcards are processed according to the rules specified in 3.7.1. Each matching file has an EFI_SHELL_FILE_INFO structure created in a linked list.

Related Definitions typedef struct _EFI_LIST_ENTRY { struct _EFI_LIST_ENTRY *Flink; struct _EFI_LIST_ENTRY *Blink; } EFI_LIST_ENTRY; typedef struct { EFI_LIST_ENTRY EFI_STATUS CONST CHAR16 CONST CHAR16 EFI_FILE_HANDLE EFI_FILE_INFO } EFI_SHELL_FILE_INFO; Link Points to the next and previous entries in the file list. If NULL, then no more files. Status The status returned when calling OpenFile() for the entry in the file list. Link; Status; *FullName; *FileName Handle; *Info;

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FullName Specifies the full name of the file, including the path. Handle The file handle of the file after it was opened. Info The file information for the opened file.

Status Codes Returned
EFI_SUCCESS
Others Create the file list successfully. Can’t create the file list.

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EFI_SHELL_PROTOCOL.OpenRoot()
Summary
Opens the root directory of a device.

Prototype typedef EFI_STATUS (EFIAPI EFI_SHELL_OPEN_ROOT)( IN EFI_DEVICE_PATH_PROTOCOL *DevicePath OUT EFI_FILE_HANDLE *FileHandle );

Parameters
DevicePath Points to the device path corresponding to the device where the EFI_SIMPLE_FILE_SYSTEM_PROTOCOL is installed. FileHandle On exit, points to the file handle corresponding to the root directory on the device.

Description
This function opens the root directory of a device and returns a file handle to it.

Status Codes Returned
EFI_SUCCESS EFI_NOT_FOUND EFI_VOLUME_CORRUPTED EFI_DEVICE_ERROR
Root opened successfully. EFI_SIMPLE_FILE_SYSTEM could not be found or the root directory could not be opened. The data structures in the volume were corrupted. The device had an error

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EFI_SHELL_PROTOCOL.OpenRootByHandle()
Summary
Opens the root directory of a device on a handle

Prototype typedef EFI_STATUS (EFIAPI EFI_SHELL_OPEN_ROOT_BY_HANDLE)( IN EFI_HANDLE DeviceHandle, OUT EFI_FILE_HANDLE *FileHandle );

Parameters
DeviceHandle The handle of the device that contains the volume. FileHandle On exit, points to the file handle corresponding to the root directory on the device.

Description
This function opens the root directory of a device and returns a file handle to it.

Status Codes Returned
EFI_SUCCESS EFI_NOT_FOUND EFI_VOLUME_CORRUPTED EFI_DEVICE_ERROR
Root opened successfully. EFI_SIMPLE_FILE_SYSTEM could not be found or the root directory could not be opened. The data structures in the volume were corrupted. The device had an error

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EFI_SHELL_PROTOCOL.ReadFile()
Summary
Reads data from the file.

Prototype typedef EFI_STATUS (EFIAPI *EFI_SHELL_READ_FILE) ( IN EFI_FILE_HANDLE FileHandle, IN OUT UINTN *ReadSize, OUT VOID *Buffer );

Parameters
FileHandle The opened file handle for read ReadSize On input, the size of Buffer, in bytes. On output, the amount of data read. Buffer The buffer in which data is read.

Description
If FileHandle is not a directory, the function reads the requested number of bytes from the file at the file’s current position and returns them in Buffer. If the read goes beyond the end of the file, the read length is truncated to the end of the file. The file’s current position is increased by the number of bytes returned. If FileHandle is a directory, then an error is returned.

Status Codes Returned
EFI_SUCCESS EFI_NO_MEDIA EFI_DEVICE_ERROR EFI_VOLUME_CORRUPTED EFI_BUFFER_TO_SMALL
Data was read. The device has no media The device reported an error The file system structures are corrupted Buffer is too small. ReadSize contains required size

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EFI_SHELL_PROTOCOL.RemoveDupInFileList()
Summary
Deletes the duplicate file names files in the given file list.

Prototype typedef EFI_STATUS (EFIAPI *EFI_SHELL_REMOVE_DUP_IN_FILE_LIST) ( IN EFI_SHELL_FILE_INFO **FileList );

Parameters
FileList A pointer to the first entry in the file list.

Description
This function deletes the reduplicate files in the given file list.

Status Codes Returned
EFI_SUCCESS
Always success.

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EFI_SHELL_PROTOCOL.SetAlias()
Summary
Changes a shell command alias.

Prototype typedef EFI_STATUS (EFIAPI *EFI_SHELL_SET_ALIAS)( IN CONST CHAR16 *Command, IN CONST CHAR16 *Alias, IN BOOLEAN Replace );

Parameters
Command Points to the null-terminated shell command or existing alias. Alias Points to the null-terminated alias for the shell command. If this is NULL, and Command refers to an alias, that alias will be deleted. Replace If TRUE and the alias already exists, then the existing alias will be replaced. If FALSE and the alias already exists, then the existing alias is unchanged and EFI_ACCESS_DENIED is returned.

Description
This function creates an alias for a shell command.

Return Value
EFI_SUCCESS EFI_ACCESS_DENIED
Alias created or deleted successfully. The alias is a built-in alias or already existed and Replace was set to FALSE.

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EFI_SHELL_PROTOCOL.SetCurDir()
Summary
Changes the current directory on the specified device.

Prototype typedef EFI_STATUS (EFIAPI *EFI_SHELL_SET_CUR_DIR) ( IN CONST CHAR16 *FileSystem OPTIONAL, IN CONST CHAR16 *Dir );

Parameters
FileSystem A pointer to the file system’s mapped name. If NULL, then the current working directory is changed. Dir Points to the null-terminated directory on the device specified by FileSystem.

Description
If the FileSystem is NULL, and the directory Dir does not contain a file system’s mapped name, this function changes the current working directory. If FileSystem is NULL and the directory Dir contains a mapped name, then the current file system and the current directory on that file system are changed. If FileSystem is not NULL, and Dir is NULL, then this changes the current working file system. If FileSystem is not NULL and Dir is not NULL, then this function changes the current directory on the specified file system. If the current working directory or the current working file system is changed then the %cwd% environment variable will be updated. For more information, see “Current Directory” , section3.5.

Status Codes Returned
≠NULL NULL The current directory. Current directory does not exist.

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EFI_SHELL_PROTOCOL.SetEnv()
Summary
Sets the environment variable.

Prototype typedef EFI_STATUS (EFIAPI *EFI_SHELL_SET_ENV) ( IN CONST CHAR16 *Name, IN CONST CHAR16 *Value, IN BOOLEAN Volatile );

Parameters
Name Points to the null-terminated environment variable name. Value Points to the null-terminated environment variable value. If the value is an empty string then the environment variable is deleted. Volatile Indicates whether the variable is non-volatile (FALSE) or volatile (TRUE).

Description
This function changes the current value of the specified environment variable. If the environment variable exists and the Value is an empty string, then the environment variable is deleted. If the environment variable exists and the Value is not an empty string, then the value of the environment variable is changed. If the environment variable does not exist and the Value is an empty string, there is no action. If the environment variable does not exist and the Value is a non-empty string, then the environment variable is created and assigned the specified value. For a description of volatile and non-volatile environment variables, see3.6.1.

Status Codes Returned
EFI_SUCCESS The environment variable was successfully updated.

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EFI_SHELL_PROTOCOL.SetFileInfo()
Summary
Sets the file information to an opened file handle.

Prototype typedef EFI_STATUS (EFIAPI *EFI_SHELL_SET_FILE_INFO)( IN EFI_FILE_HANDLE FileHandle, IN CONST EFI_FILE_INFO *FileInfo );

Parameters
FileHandle A file handle FileInfo Points to new file information.

Description
This function changes file information.

Status Codes Returned
EFI_SUCCESS EFI_NO_MEDIA EFI_DEVICE_ERROR EFI_VOLUME_CORRUPTED EFI_WRITE_PROTECTED EFI_ACCESS_DENIED EFI_VOLUME_FULL EFI_BAD_BUFFER_SIZE
The information was set. The device has no medium. The device reported an error. The file system structures are corrupted. The file or medium is write-protected. The file was opened read-only. The volume is full.

BufferSize is smaller than the size of EFI_FILE_INFO.

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EFI_SHELL_PROTOCOL.SetFilePosition()
Summary
Sets a file’s current position

Prototype typedef EFI_STATUS (EFIAPI *EFI_SHELL_SET_FILE_POSITION)( IN EFI_FILE_HANDLE FileHandle, IN UINT64 Position );

Parameters
FileHandle The file handle on which requested position will be set. Position Byte position from the start of the file

Description
This function sets the current file position for the handle to the position supplied. With the exception of seeking to position 0xFFFFFFFFFFFFFFFF, only absolute positioning is supported, and seeking past the end of the file is allowed (a subsequent write would grow the file). Seeking to position 0xFFFFFFFFFFFFFFFF causes the current position to be set to the end of the file.

Status Codes Returned
EFI_SUCCESS EFI_UNSUPPORTED
Data was written. The seek request for nonzero is not valid on open directories.

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EFI_SHELL_PROTOCOL.SetMap()
Summary
Changes a shell command alias.

Prototype typedef EFI_STATUS (EFIAPI *EFI_SHELL_SET_MAP)( IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath, IN CONST CHAR16 *Mapping );

Parameters
DevicePath Points to the device path. If this is NULL and Mapping points to a valid mapping, then the mapping will be deleted. Mapping Points to the null-terminated mapping for the device path.

Description
This function creates a mapping for a device path.

Return Value
EFI_SUCCESS EFI_NO_MAPPING EFI_ACCESS_DENIED
Mapping created or deleted successfully. There is no handle that corresponds exactly to DevicePath. See the boot service function LocateDevicePath(). The mapping is a built-in alias.

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EFI_SHELL_PROTOCOL.WriteFile()
Summary
Writes data to the file.

Prototype typedef EFI_STATUS (EFIAPI EFI_SHELL_WRITE_FILE)( IN EFI_FILE_HANDLE FileHandle, IN OUT UINTN *BufferSize, OUT VOID *Buffer );

Parameters
FileHandle The opened file handle for writing. BufferSize On input, size of Buffer. Buffer The buffer in which data to write.

Description
This function writes the specified number of bytes to the file at the current file position. The current file position is advanced the actual number of bytes written, which is returned in BufferSize. Partial writes only occur when there has been a data error during the write attempt (such as “volume space full”). The file automatically grows to hold the data, if required. Direct writes to opened directories are not supported.

Status Codes Returned
EFI_SUCCESS EFI_UNSUPPORTED EFI_NO_MEDIA EFI_DEVICE_ERROR EFI_VOLUME_CORRUPTED EFI_WRITE_PROTECTED EFI_ACCESS_DENIED EFI_VOLUME_FULL
Data was written. Writes to open directory are not supported The device has no media The device reported an error The file system structures are corrupted The device is write-protected The file was open for read only The volume is full

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2.3

EFI_SHELL_PARAMETERS_PROTOCOL

EFI_SHELL_PARAMETERS_PROTOCOL
Summary
Shell application’s arguments.

GUID
#define EFI_SHELL_PARAMETERS_PROTOCOL_GUID \ { 0x752f3136, 0x4e16, 0x4fdc, \ { 0xa2, 0x2a, 0xe5, 0xf4, 0x68, 0x12, 0xf4, 0xca } };

Prototype typedef struct _EFI_SHELL_PARAMETERS_PROTOCOL { CHAR16 **Argv; UINTN Argc; EFI_FILE_HANDLE StdIn; EFI_FILE_HANDLE StdOut; EFI_FILE_HANDLE StdErr; } EFI_SHELL_PARAMETERS_PROTOCOL;

Parameters
Argv Points to an Argc-element array of points to null-terminated strings containing the command-line parameters. The first entry in the array is always the full file path of the executable. Any quotation marks that were used to preserve whitespace have been removed. Argc The number of elements in the Argv array. StdIn The file handle for the standard input for this executable. This may be different from the ConInHandle in the EFI_SYSTEM_TABLE. StdOut The file handle for the standard output for this executable. This may be different from the ConOutHandle in the EFI_SYSTEM_TABLE. StdErr The file handle for the standard error output for this executable. This may be different from the StdErrHandle in the EFI_SYSTEM_TABLE.

Description
An instance of this protocol is installed on each shell application’s image handle prior to calling StartImage(). It describes all of the command-line parameters passed on the command line, as well as the standard file handles for standard input, output and error output.

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54

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3 UEFI Shell Features
The UEFI Shell supports an interactive command-line interface, scripting, and a standard set of commands. All the commands can be invoked by entering the name of the command at the command prompt. For external commands, they must reside in a file system. So, to run them users need to have at least one mapped file system and put those external commands under this file system. The active drive may be changed by entering the mapped name followed by a ‘:’ at the command prompt.

3.1

Levels Of Support
This section describes the different standard levels of shell support. The different standard levels are designed to provide different feature/size tradeoffs for different uses. The levels mentioned here are referenced throughout this specification

Table 1 Support Levels
Level Name Execute()/ Scripting/ startup.nsh No Yes PATH? ALIAS? Interactive? Commands

0 1

Minimal Scripting

No Yes

No No

No No

None for, endfor, goto, if, else, endif, shift, exit attrib, cd, cp, date*, time*, del, load, ls, map, mkdir, mv, rm, reset, set, timezone* alias, date, echo, help, pause, time, touch, type, ver, cls, timezone

2

Basic

Yes

Yes

Yes

No

3

Interactive

Yes

Yes

Yes

Yes

*Non-interactive forms only Execute()/Scripting/startup.nsh support indicates whether the Execute() function is supported by the EFI_SHELL_PROTOCOL, whether or not scripts are supported and whether the default startup script startup.nsh is supported.

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PATH support determines whether the PATH environment variable will be used to determine the location of executables. ALIAS support determines whether the ALIAS environment variable will be used to determine alternate names for shell commands. Interactive determines whether or not an interactive session can be started. For more information on scripting, see UEFI Shell Script (Chapter 4). For more information on processing of the startup.nsh file, please see UEFI Shell Initialization (section 3.3). The shell must remain compliant with its advertised shellsupport command profile. There can be cases where a shell implementation may not want to expose certain commands to all users. If a shell implementation wants to make a particular command inaccessible to a particular user, they must properly interpret the command request and return an appropriate return code, such as SHELL_SECURITY_VIOLATION.

3.2

Invocation
The UEFI Shell is a UEFI application. The UEFI Shell takes command-line options that are null-terminated UCS-2 encoded strings. The syntax is: shell.efi [ShellOpt-options] [options] [file-name [file-name-options]] The command-line options are separated by the space or tab character. The options are processed left-to-right retrieved from the LoadOptions field of the EFI_LOADED_IMAGE_PROTOCOL. The following table describes the standard command-line options.

Table 2 Standard Command Line Options
Option file-name Description The name of a UEFI shell application or script to be executed after initialization is complete. By default, if file-name is specified, then -nostartup is implied. Scripts are not supported by level 0. The command-line options that are passed to file-name when it is invoked. Options (from table X below) which control the initialization behavior of the shell. Options (from table X below) which control the initialization behavior of the shell. These options are read from the EFI global variable “ShellOpt” and are processed before options or file-name.

file-nameoptions options ShellOptoptions

Table 3: UEFI Shell Invocation Options
-nostartup -noconsoleout
The default startup script startup.nsh will not be executed. Console output from the shell applications will not be displayed. This has no effect for UEFI Shells that do not support an interactive mode.

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Console input will not be accepted from the user. This has no effect for UEFI Shells that do not support an interactive mode. Specifies the integer number of seconds the shell will delay prior to the execution of startup.nsh. Ignored for shell level 0 or if –nostartup is specified. If n is not specified, the default is 5 seconds. If 0 is specified, then there will be no delay. If –nointerrupt is specified, then there will be no delay. Execution interruption (as described in Execution Interrupt Support) is not allowed. This has no effect for UEFI Shells that do not support an interactive mode. The default mappings will not be displayed. The version information will not be displayed. The default startup script startup.nsh will be executed. Requires shell support level 1 or higher. This overrides the default behavior when filename is specified.

-nointerrupt

-nomap -noversion -startup

3.3

Initialization
This section describes the steps taken during shell initialization. The following steps are not exhaustive, but they are executed in order:

1. 2. 3. 4. 5. 6. 7.

The command-line options of the shell itself are processed. Default file system (FSx:) mapped names are created. The current directory for each mapped name is set to the root. The default alias settings are read from non-volatile storage. This is only supported in shell level 2. The default environment variable settings are read from non-volatile storage. The profiles are read into the ‘profiles’ environment variable. If the shell supports interactive mode and console output support is enabled, then the console is cleared. The platform watchdog will be cleared through the UEFI SetWatchdogTimer() API to avoid inadvertent platform resets during long operations within the UEFI Shell environment. If the shell supports interactive mode and console output support is enabled and version support (see –noversion) is enabled, then the equivalent of ver will be executed. If the shell supports interactive mode and console output support is enabled and map support is enabled (see –nomap), then the equivalent of map –terse will be executed. If interactive mode is supported and execution interrupt is supported (see – nointerrupt) then the shell will wait for the number of seconds specified by the –delay option.
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8.

9.

10.

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11. 12.

If startup.nsh is supported and enabled (see –startup and –nostartup), the script will be launched. If a file name was specified among the command-line options, then the image or script (if supported) is launched.

3.3.1 Finding startup.nsh
When executing startup.nsh, the shell will search for it first in the directory where the shell itself was launched. If it cannot find the startup.nsh file in that directory or it was not launched from a file system, it will search the execution path defined by the environment variable PATH.

3.3.2 Supported Profiles
The UEFI Shell may have support for zero or more profiles, such as those described in chapter 5 built in to its executable. Additional profiles are described in the file ‘profiles.txt’, located in the same directory as the UEFI Shell executable. The contents of the file are carriage-return delimited (one profile name per line) and are read into the UEFI shell environment variable ‘profiles’, where they are semicolon (‘;’) delimited. Profiles names that begin with ‘UEFI’ are reserved for use in this specification.

3.4

Command-Line
The UEFI Shell implements a programming language that provides control over the execution of individual commands. Command names and keywords in certain commands are all case insensitive. The UEFI Shell processes the command-line by

1.

Substituting aliases. The UEFI Shell supports specifying aliases for UEFI Shell commands (both internal and external). The substitution is performed automatically on the first command-line parameter. Substituting variables. The UEFI Shell finds the % character and substitutes the value of an Environment Variable, Positional Parameter or Index Parameter based on the characters found after the % character. See Variables (section, 3.6) for more information. Setting up input and output redirection. Using special characters on the command-line, the UEFI Shell can get input from a file and send output to a file. See Redirection (section 3.4.4) for more information. Breaking up the command-line into arguments. The arguments are delimited by non-quoted whitespace characters. Launching the shell command or UEFI Shell script.
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2.

3.

4. 5.

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When the shell scans its input, it always treats certain characters (#, >, < | % ” ^ *, ?, [, ] Ends a command line. Ends an argument, if it is not in a quotation. Starts a comment. Used for output redirection. Used for input redirection Used for pipe command support. Used to delimit a variable or an argument. Used to delimit a quotation. Prevents the next character from being interpreted as having special meaning. Can be used inside quoted strings. Wildcards to specify multiple similar file names. Description

3.4.2 Escape Characters
The escaping character ^ is used to prevent interpreting the character that immediately follows it as a special character.

3.4.3 Quoting
The UEFI Shell uses quotation marks for argument grouping. Normally, the UEFI Shell will interpret a one or more whitespace character as an argument delimiter. However, if the whitespace character appears between double quotation marks, it will be ignored for the purposes of argument delimiting. Empty strings are treated as valid command line arguments. Substitution of environment variables and positional parameters still occurs within quotation marks. Double-quotation marks that surround arguments are stripped before they are passed to the entry point of a shell application. For more information, see the Argv member of the EFI_SHELL_PARAMETERS_PROTOCOL. Double-quotation marks that surround arguments are not stripped in positional parameters (see Positional Parameters, section 3.6.2) or on the copy of the command line passed in the LoadOptions member of the EFI_LOADED_IMAGE_PROTOCOL passed to shell applications. To include a double-quotation mark inside of a quoted string, use ^”. To include a ^ character inside of a quoted string, use ^^.
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For information about how the quotes are treated in each of the options, see “Shell Commands”, chapter 5).

3.4.4 Redirection

3.4.4.1

Output Redirection
Output of EFI Shell commands can be redirected to files. For example: Command > ucs2_output_file_pathname Command >a ascii_output_file_pathname Command 1> ucs-2_output_file_pathname Command 1>a ascii_output_file_pathname Command 2> ucs-2_output_file_pathname Command 2>a ascii_output_file_pathname Command >> ucs-2_output_file_pathname Command >>a ascii_output_file_pathname Command 1>> ucs-2_output_file_pathname Command 1>>a ascii_output_file_pathname Table 4 shows the special character combinations that are used to denote output redirection operations:

Table 4 Output Redirection Syntax
Character Sequence Description Redirect standard output to a UCS-2 encode file. Redirect standard output to an ASCII file. Redirect standard output to a UCS-2 encoded file. Redirect standard output to an ASCII file. Redirect standard error to a UCS-2 encoded file. Redirect standard error to an ASCII file. Redirect standard output to an environment variable, encoded as UCS-2. Redirect standard output to an environment variable, encoded as UCS-2. Redirect standard error to an environment variable, encoded as UCS2. Redirect standard output appended to a UCS-2 encoded file. Redirect standard output appended to an ASCII file. Redirect standard output appended to a UCS-2 encoded file. Redirect standard output appended to an ASCII file. Append standard output to an environment variable, encoded as UCS2. Append standard output to an environment variable, encoded as UCS2.

> >a 1> 1>a 2> 2>a >v 1>v 2>v >> >>a 1>> 1>>a >>v 1>>v

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Append standard error to an environment variable, encoded as UCS2.

The UEFI Shell will redirect standard output to a single file or variable and standard error to a single file or variable. Redirecting both standard output and standard error to different files or variables is allowed, but not to the same file or variable. Redirecting standard output to more than one file or variable on the same command is not supported. Similarly, redirecting to multiple files or variables is not supported for standard error either. When redirecting output to an environment variable, if a new environment variable will be created, then it will be volatile. If the environment variable already exists and is non-volatile, an error will be generated. All output to UCS-2 encoded files will be prefixed with the Unicode Byte Ordering Character (0xFFFE) if (a) there is at least one other character output and (b) that character is not the Unicode Byte Ordering Character. “NUL” is used as a special output file name. When “NUL” is used, the output will not be written into a file. Instead, they are discarded silently.

3.4.4.2

Input Redirection
Contents from an existing file or variable can be used as standard input to a UEFI shell command. Any commands coming from an ASCII file will be automatically be converted to the equivalent UCS-2 encoding and passed to the UEFI shell command. When redirecting input from an environment variable, the environment variable must already exist. If it does not, an error will be generated. The shell will ensure that the first character read from an input redirected environment variable will contain the Unicode Byte Ordering Character (0xFFFE). If the first character in the input source is not the Unicode Byte Ordering Character, the shell will insert this character in the output from the input redirected variable. This is done to ensure that an input redirected variable will be look like a UCS-2 encoded file. Redirecting input from a non-volatile variable is permitted.

Table 5 Input Redirection Syntax
Character Sequence Description Redirect standard input from a Unicode file. Redirect standard input from an ASCII file. Redirect standard input from an environment variable.

< %2, %4 -> %3, etc.) There is no way for a UEFI Shell script to access the 10th or greater argument without using shift. When executing the UEFI Shell script, the %n is replaced by the corresponding argument on the command-line that invoked the script. If a positional parameter is referenced in the UEFI Shell script but that parameter was not present, then an empty string is substituted. Positional parameters do not have quotation marks removed from them. For more information on how quotation marks are handled, see “Quoting”

3.6.3 Index Parameters
Index parameters are the variables created by the for command (see page 139) when executing inside of a UEFI Shell script. Each index parameter is in the form of %x, where x is a case-insensitive letter (%a-%z). When executing the UEFI Shell script, the %x is replaced by the value specified by the for command. If the specified index parameter has not been defined in the current UEFI Shell script, the script execution will halt with an error.

3.6.4 Aliases
An alias creates an additional name for an internal UEFI Shell command or a UEFI Shell application. Aliases can be used to provide alternative commonly used names for existing shell commands or even create shortcuts. An alias is a C-style identifier and may refer to an internal command or else the directory and file name of a UEFI shell application. During command-line processing, if the 1st argument of a command is a defined alias, the shell replaces the alias with its defined value. The alias substitution occurs after
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the variable substitution. So if %myvariable% is set to dir and dir is aliased to ls, entering %myvariable% in command line will cause the ls command to be executed. Alias substitution is not recursive. There are several built-in aliases (sometimes referred to as synonyms) provided by the UEFI Shell for the following commands:

Table 8 Built-in Aliases for the UEFI Shell
Original Command Built-In Alias Description List directory contents Delete a file Copy a file. Create a directory Display memory

ls rm cp mkdir dmem

dir del copy md mem

3.7

File Names
The UEFI Shell supports file names and paths with the following format: fs-path fs-map-name fs-divider fs-dirs := [fs-map-name] [fs-divider][fs-dirs][fs-name] := identifier : := \ | / := fs-dir | fs-dirs fs-dir fs-dir fs-name := fs-name fs-divider := fs-file-name .fs-file-ext

fs-file-name := one or more ASCII characters, excluding *?\/” Both short and long names are supported. The maximum valid length for a file path is 255 characters.

3.7.1 Wildcard Expansion
The *, ? and [] characters can be used as wildcard characters in file name command-line options certain UEFI shell commands that use the OpenFileList() function. In addition, the UEFI Shell for and if script commands also expand arguments containing wildcard characters to existing file names that matches the pattern. A ^ before the wildcard cannot prevent the wildcard from being expanded.

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[] can be either wildcard characters or literal file name characters, the UEFI Shell will try to take them as wildcard characters first to match files, if there are files matched, no further interpretation. Otherwise, they will be considered as literal characters in file names.

Table 9 Wildcard Character Expansion
Character Sequence Description Matches zero or more characters in a file name. Matches exactly one character in a file name. Matches one character in a file name with one of the characters in []

* ? []

3.7.2 Mappings
Mappings are C-style identifiers that act as an alias for a device path. These mappings can be used interchangeably with the device path in the EFI_SHELL_PROTOCOL and on the interactive shell’s command line. Default mappings (such as fsx) are created by the UEFI Shell during initialization (see Initializaiton, section 3.3. Other mappings can be created using the map shell command or the SetMap() function. A mapping which translates to a device path of a device that has a file system protocol installed on its handle is called a file system mapping.

3.7.3 Consistent File System Mapping
The UEFI Shell provides consistent mapping for file system mappings. The consistent mappings will not change after reboot or after ‘map –r’ if the hardware configuration hasn’t changed. If two or more computers have the same hardware configurations, the consistent mapping results on these computers should be exactly the same. Hardware configuration changes are defined as the changes of controllers or physical interfaces to which the devices are connected. If you are used to the fsx notation style for mapping file systems, then the new consistent mapping convention might look a little different. For example, the GUIDed file system may have a consistent mapping , such as f0agonennapphibbndlnmeaakamjeafdnb. The fsx style mappings facilitates the use of mappings on the command line, but they don’t have the consistent mapping characteristics. Consistent mapping only applies to file system mappings, not other device mappings.

3.8

Scripts
The UEFI Shell has the capability of executing commands from a file (script). UEFI Shell script files are named using the ".nsh" extension. Script files can be either UCS2 or ASCII format files. UEFI Shell script files are invoked by entering the filename at the command prompt, with or without the filename extension. See “Scripts” (section 4) for more information.

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Nesting the Shell
The UEFI Shell supports nested shell execution. The UEFI Shell can run the shell from within itself. The maximum nesting level is determined by how much memory the system has. The command exit can be used to exit the current shell instance. If the current shell is a child shell, it will return to the parent shell. Newly launched shell will have a brand new execution environment except for environment variables and aliases.

3.10

Interactive Features
Even though the shell design specification primarily discusses aspects of the shell that can run without user interaction, there are some features described which can augment the experience of users that are actively interacting with the console.

3.10.1

Key History Support
The UEFI Shell will save commands history that executed from the shell prompt. User can press up-arrow key and down-arrow key to browse the previous commands. Commands that were executed in script will not be saved in the key history.

3.10.2

Execution Interrupt Support
The UEFI Shell supports the capability of interrupting the execution of the shell commands and scripts. There are two kinds of the execution interrupt: script execution interrupt and internal command execution interrupt. Script Execution Interrupt. The user can press CTRL-C to interrupt the execution of the script. The interrupt can only happen between commands in a script. The script supports the nesting of scripts. Once a script is interrupted, all its predecessor scripts are also interrupted. Shell Command Execution Interrupt. The user can press the CTRL-C key sequence to interrupt the execution of some time-consuming UEFI Shell commands (i.e. ls –r). The UEFI Shell detects this key sequence and signals the ExecutionBreak member of the EFI_SHELL_PROTOCOL. Individual UEFI Shell commands check the state of ExecutionBreak as often as practical and return the SHELL_ABORTED error code. The UEFI Shell may not support asynchronous execution interrupt for commands or applications.

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Output Streaming Control
The UEFI Shell supports the ability to pause and resume the streaming of characters to the output device. The user can press the CTRL-S key sequence to pause and any key to resume the output results produced by the current running commands or applications. It is especially useful for the commands and applications that may produce a great deal of the output results.

3.10.4

Scroll Back Buffer Support
The UEFI Shell supports the ability to scroll back and forward the output so that consoles can have screen history. The user can press Page Up and Page Down to scroll back and forward the screen history, and press any other key to quit scrolling. However, the user cannot do this while the command, application or script is being executed. The text output history will be at least 3 screens.

3.11

Shell Applications
UEFI Shell applications have the extension .efi and have the same entry point (EFI_IMAGE_ENTRY_POINT) defined in section 4.1 of the UEFI specification. When the entry point to a shell command is called, the image handle (ImageHandle) has both the EFI_LOADED_IMAGE_PROTOCOL and the EFI_SHELL_PARAMETERS_PROTOCOL installed on it. In the EFI_LOADED_IMAGE_PROTOCOL, the LoadOptions member points to the NULLterminated, expanded command line. The first part (which corresponds to Argv[0] in the EFI_SHELL_PARAMETERS_PROTOCOL) is the file path of the executable after alias substitution. After this, delimited by a whitespace character, are listed each of the arguments, with all environment variables expanded, and with quotation marks still present. This is different from what appears in Argv[] in the EFI_SHELL_PARAMETERS_PROTOCOL. The EFI_SHELL_PARAMETERS_PROTOOCOL has two members: Argv, which points to each of the command-line arguments and Argc, which is the number of command-line arguments. There is always at least one command-line argument: the path and file name of the shell command. Any arguments are enumerated in Argv[1-n], with all environment variables expanded and all quotation marks removed. If ExecutionBreak was signaled during the execution of a UEFI Shell application, then it will be cleared upon return to the shell.

3.11.1

Installation
During installation, UEFI Shell applications may choose to update certain global files or settings, which are used for detecting installed UEFI Shell profiles or providing help text for UEFI shell applications. During installation, UEFI Shell applications may update the profiles environment variable, which lists all of the command profiles supported by the current
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implementation of the shell. Some of these command profiles are standard (see “Shell Command Profiles”, section 5.2) and others can be defined by implementers. During installation, UEFI Shell applications may provide a help file (as described in “Command-Line Help”, section 3.11.2) to support the standard help command. During installation, UEFI Shell applications may update a help file for the help category/categories to which the application belongs. This consists of creating a NAME section for the .man file and then copying the NAME section from the command’s help file to the end of the DESCRIPTION section of the .man file, if not already present. The shell application’s category (or categories) is listed in the CATEGORY section of the shell application’s help (.man) file. Help categories are not described as part of this specification.

3.11.2

Command-Line Help
The user can get UEFI Shell application command-line either using the help command or else by typing in -?. Both of these use the GetHelpText() (page 32) function to retrieve the help text. The UEFI Shell gets help text for UEFI Shell applications by search the directory where startup.nsh was located (highest priority) (if –nostartup was not specified) and then the directories specified by the path environment variable for a file with the same name as the UEFI Shell application, but with the .man extension. The format of these files is described in Appendix B. The UEFI Shell supports help categories, which have .man pages similar to those for UEFI shell applications, except using the category name instead of the application name.

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Scripts

UEFI Shell scripts allow user to simplify routine or repetitive tasks. A shell script program is a UCS-2 or ASCII text file that contains one or more commands and has a .nsh file name extension. When the file name is typed at the command prompt, commands in the file are executed sequentially. All shell commands can be executed in scripts. In addition, some script-only commands are also provided to do basic flow control. Script-only means those commands can be only executed in UEFI Shell Script files, and cannot be executed from the shell prompt. Up to ten positional arguments are supported for scripts. Positional argument substitution is performed before the execution of each line in the script file. Positional arguments are denoted by %n, where n is a digit between 0 and 9. By convention, %0 is the name of the script file currently being executed. Script file execution can be nested; that is, script files may be executed from within other script files. Recursion is allowed. Shell scripts run in their parent’s environment. Output and input redirection are fully supported in scripts. Output redirection on a command in a script file causes the output for that command to be redirected. Output redirection on the invocation of a script causes the output for all commands executed from that script to be redirected to the file, with the output of each command appended to the end of the file. By default, both the input and output for all commands executed from a script are echoed to the console. Display of commands read from a script file can be suppressed via the echo -off command (see echo). Also, additional ‘@’ before a command in a script file can prevent the current command from being echoed. If output for a command is redirected to a file, then that output is not displayed on the console. Commands executed from a script will not be saved by the shell for key history and these commands cannot be recalled by pressing Up-Arrow key.

4.1

Comments
Comments can be embedded in scripts. The # character on a line is used to denote that all characters on the same line and to the right of the # are to be ignored by the shell. Whether the echo state is on or off, comments are not echoed to the console.

4.2

Error Handling
By default, if an error is encountered during the execution of a command in a script, the script will continue to execute. But if an error is encountered when executing the script-only commands which affects the logic of the script, such as for, endfor, if,

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else, endif, and goto, the script will exit. If the error arousing script is a called by another script, the caller script will continue to execute. The lasterror shell variable allows scripts to test the results of the most recently executed command using the if command. This variable is maintained by the shell, is read-only, and cannot be modified by command set. Script-only commands, as well as echo, which are used to control the logic of the script, do not affect the value of variable lasterror. The lasterror environment variable is not changed by comments.

4.3

Script Nesting
Scripts can be nested. A script can call one or more scripts. The embedded script will be executed as a command. After the whole embedded script is executed completely, the next command will be executed. The UEFI Shell will automatically save and restore the running mode before and after the execution of nested scripts so that the changes of running modes in nested scripts will not affect the running mode of a parent script.

4.4

Output and Echoing
Output redirection is supported for scripts. Output redirection on a command in a script file causes the output for that command to be redirected. Output redirection on the invocation of a script causes the output for all commands executed from that script to be redirected to the file, with the output of each command appended to the end of the file. If a command in a script redirects its output to file1, while the output is redirected to file2 on invocation of a whole script, the output of that command will be redirected to file1, but the echo of the command itself (if echo state is on) will appear in file2, as well as output of all other commands. When a script is launched from the interactive shell, it inherits its echo state from interactive shell or parent script. Changing echo state in the script does not affect the echo state of the interactive shell. When a script calls another script, the called script inherits the caller script’s current echo state. But if the called script changes the echo state, after returning, the caller’s echo script changes, too.

4.5

Limitations
Following are some examples of known limitations with the UEFI scripts:

1. 2. 3. 4.

Cannot read and write the same file within a single command, for example, fs0:>type test.nsh > test.nsh goto cannot be used to jump into another loop. Don’t use the same index variable in nested for statements. Index values cannot be referred outside of the for statement that defines it.
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5.1 Overview

Shell Commands

This section describes the standard UEFI Shell commands. The table below lists all standard UEFI Shell commands.

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Table 10 Commands from Default Build Shell
Command Description Required at Shell Level or Profile 3 2 Debug1, Install1 2 3 Debug1 Driver1 2 2/3 Debug1 2 Driver1 Driver1 Driver1 2 Driver1 Debug1 Debug1 Driver1 Driver1 Driver1 3

alias attrib bcfg cd cls comp connect cp date dblk del devices devtree dh dir disconnect dmem dmpstore drivers drvcfg drvdiag echo

Displays, creates, or deletes aliases in the UEFI Shell environment Displays or changes the attributes of files or directories. Manipulate boot order and driver order Displays or changes the current directory Clears the standard output and optionally changes the background color Compares the contents of two files on a byte for byte basis Binds a driver to a specific device and starts the driver. Copies one or more source files or directories to a destination. Displays and sets the current date for the system. Displays the contents of one or more blocks from a block device. Deletes one or more files or directories. Displays the list of devices managed by UEFI drivers. Displays the tree of devices compliant with the UEFI Driver Model. Displays the device handles in the UEFI environment. Lists directory contents or file information. Disconnects one or more drivers from the specified devices. Displays the contents of system or device memory. Manages all UEFI NVRAM variables. Displays a list of information for drivers that follow the EFI Driver Model in the EFI environment. Configures the driver using the UEFI Configuration Access Protocol. Invokes the Driver Diagnostics Protocol. Controls whether or not script commands are displayed as they are read from the script file and prints the given message to the display.

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Description

Required at Shell Level or Profile 3 2 Debug1 Debug1 Debug1 1 1 1 1 1 3 1 Debug1 3 Debug1 1 Network1 Network1 2 Debug1 2 2 Debug1 Debug1

alias attrib edit eficompress efidecompress else endfor endif exit for getmtc goto guid help hexedit if ifconfig ipconfig load loadpcirom ls map mem memmap

Displays, creates, or deletes aliases in the UEFI Shell environment Displays or changes the attributes of files or directories. Full screen editor for ASCII or UCS-2 files. Compress a file using EFI Compression Algorithm. Decompress a file using EFI Decompression Algorithm. Conditionally execute commands if a previous if condition was false. End a loop stated with for in a script. End a conditional block started with if. Exits the UEFI Shell environment and returns control to the parent that launched the UEFI Shell. Start a loop in a script Return current monotonic count. Go to a label in a script Displays all registered EFI GUIDs. Displays the list of commands that are built into the UEFI Shell. Full screen hex editor for files, block devices, or memory. Conditionally execute script statements. Displays or modifies the current IP configuration. Displays or modifies the current IP configuration. Loads a UEFI driver into memory. Loads a PCI Option ROM from the specified file. Lists a directory's contents or file information. Defines a mapping between a user-defined name and a device handle. Displays the contents of system or device memory. Displays the memory map maintained by the EFI environment.

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Command

Description

Required at Shell Level or Profile 3 2 2 Debug1 Debug1 2 Driver1 2 3 Debug1 Network1 Driver1 2 2 Debug1 2 Debug1 Debug1 1 Debug1 2/3 2/3 3 3

alias attrib mkdir mm mode mv openinfo parse pause pci ping reconnect reset rm sermode set setsize setvar shift smbiosview time timezone touch type

Displays, creates, or deletes aliases in the UEFI Shell environment Displays or changes the attributes of files or directories. Creates one or more new directories. Displays or modifies MEM/MMIO/IO/PCI/PCIE address space. Displays or changes the console output device mode. Moves one or more files to a destination within a file system. Displays the protocols and agents associated with a handle. Parse data returned from standard formatted output Pause script execution and wait for a keypress Displays PCI device list or PCI function configuration space. Check response of an ip address. Reconnects drivers to the specific device. Resets the system. Deletes one or more files or directories. Sets serial port attributes. Used to maintain the environment variables that are available from the EFI environment. Set the size of a file Change value of UEFI variable Shift to the 2 nd set of positional parameters

Displays SMBIOS information. Displays or sets the current time for the system. Displays or sets time zone information. Updates the time and date on a file to the current time and date. Sends the contents of a file to the standard output device.

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Description

Required at Shell Level or Profile 3 2 Driver1 3

alias attrib unload ver

Displays, creates, or deletes aliases in the UEFI Shell environment Displays or changes the attributes of files or directories. Unloads a driver image that was already loaded. Displays the version information for this EFI firmware.

5.1.1 Explanation of Command Description Layout
The description of each command is composed of four sections: Summary, Usage, Options, Description, Notes, Status Codes Returned and Examples. Summary is a brief explanation of the function of the command. Usage describes how the command is used. Options gives a complete description of each of the commandlie options. Description describes the details of the command. Examples give sample usage of the command. The output may differ from the output listed in this section.

5.1.2 Shell Command-Line Options
The following table describes the standard command-line options. No command supports all options, but when needed, the following option parameters are used:

Table 11Standard Command Line Options
Option Description Pause after each page. The command will suppress all output. Standard Format Output. Instead of normal output, the shell command will output using the standard format described Appendix D. Terse Output. The shell command will restrict additional informative content. Verbose Output. The shell command will output additional informative content. Help. For more information on how command-line help is supported, see section 3.11.2.

-b, -break -q, -quiet -sfo -t, -terse -v, -verbose -?

Command-line options that begin with the ‘_’ character are implementation-specific.

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5.2

Shell Command Profiles
Shell command profiles are groups of shell commands that are identified by a profile name. Profile names that begin with the ‘_’ character are reserved for individual implementations. For information on how profiles are identified, see section 3.3.2 (Supported Profiles). For more information on how profiles are updated when new commands are installed, see section 3.11 There are four standard profiles:

Table 12Standard Profiles
Profile Name Description Standard set of driver-related commands. Standard set of debug commands. Standard set of networking-related commands. Standard set of commands to aid installation.

Driver1 Debug1 Network1 Install1

5.3 alias Summary

Shell Commands

Displays, creates, or deletes aliases in the UEFI Shell environment.

Usage alias [-d|-v] [alias-name] [command-name]

Options alias-name Alias name command-name Original command’s name or original command’s file name/directory. -d Delete an alias. command-name should not be present. -v Make the alias volatile.

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Description
This command displays, creates, or deletes aliases in the UEFI Shell environment. An alias provides a new name for an existing UEFI Shell command or UEFI application. Once the alias is created, it can be used to run the command or launch the UEFI application. There are some aliases that are predefined in the UEFI Shell environment. These aliases provide the MS-DOS and UNIX equivalent names for the file manipulation commands. See Built-In Aliases (section 3.6.4) for more details. Aliases will be retained even after exiting the shell unless the –v option is specified. If -v is specified then the alias will not be valid after leaving the shell.

Status Codes Returned
SHELL_SUCCESS SHELL_INVALID_PARAMETER SHELL_OUT_OF_RESOURCES
The action was completed as requested. One of the passed in parameters was incorrectly formatted or its value was out of bounds. A request to set a variable in a non-volatile fashion could not be completed. The resulting non-volatile request has been converted into a volatile request. This function was not performed due to a security violation

SHELL_SECURITY_VIOLATION

Examples
To display all aliases in the UEFI Shell environment: Shell> alias md : mkdir rd : rm To create an alias in the UEFI Shell environment: Shell> alias myguid guid Shell> alias md : mkdir rd : rm myguid : guid To delete an alias in the UEFI Shell environment: Shell> alias -d myguid Shell> alias md : mkdir rd : rm To add a volatile alias in the current EFI environment, which has a star * at the line head. This volatile alias will disappear at next boot.
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Shell> Shell> md rd * fs0

alias -v fs0 floppy alias : mkdir : rm : floppy

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attrib
Summary
Displays or changes the attributes of files or directories.

Usage attrib [+a|-a] [+s|-s] [+h|-h] [+r|-r] [file...] [directory...]

Options
+a|-a Set or clear the ‘archive’ attribute +s|-s Set or clear the ‘system’ attribute +h|-h Set or clear the ‘hidden’ attribute +r|-r Set or clear the ‘read-only’ attribute file File name (wild cards are permitted) directory Directory name (wildcards are permitted)

Description
This command displays and sets the attributes of files or directories. The following four attribute types are supported in the UEFI file system: • • • • Archive [A] System [S] Hidden [H] Read only [R]

If a file (in general meaning) is a directory, then it is also shown to have the attribute [D]. If any file in the file list that is specified in the command line does not exist, attrib will continue processing the remaining files while reporting the error. If no file or directory is specified, then all of the files in the current directory are displayed. If no attribute is specified, then the attributes of the files will be displayed.

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Status Codes Returned
SHELL_SUCCESS SHELL_NOT_FOUND SHELL_INVALID_PARAMETER SHELL_SECURITY_VIOLATION SHELL_WRITE_PROTECTED
The action was completed as requested. The requested file was not found. One of the passed in parameters was incorrectly formatted or its value was out of bounds. This function was not performed due to a security violation The media that the action was to take place on is write-protected.

Examples
• To display the attributes of a directory: fs0:\> attrib fs0:\ attrib:D fs0:\ To display the attributes of all files and sub-directories in the current directory: fs0:\> attrib * attrib: AS fs0:\serial.efi attrib:DA fs0:\test1 attrib: A HR fs0:\bios.inf attrib: A fs0:\VerboseHelp.txt attrib: AS fs0:\IsaBus.efi To add the system attribute to all files with extension '.efi': fs0:\> attrib +s *.efi

•

•

•

To remove the read only attribute from all files with extension '.inf': fs0:\> attrib -r *.inf attrib: A H fs0:\bios.inf

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bcfg
Summary
Manages the boot and driver options that are stored in NVRAM.

Usage bcfg driver|boot [dump [-v]] [add # file "desc"] [addp # file “desc”] [addh # handle “desc”] [rm #] [mv # #] [-opt # [[filename]|[”data”]] | [KeyData *]]

Options driver Display/modify the driver option list boot Display/modify the boot option list dump Display the option list -v Display the option list with extra info including the optional data. add Add an option. The # is the number of options to add in hexadecimal. The file name of the UEFI application/driver for the option. The quoted parameter is the description of the option being added. addh Add an option that refers to the driver specified by handle. The # is the number of options to add, in hexadecimal. The handle is the driver handle, in hexadecimal. The device path for the option is retrieved from the handle. The quoted parameter is the description of the option being added. addp Add an option that refers to a specific file. Only the portion of the device path starting with the hard drive partition is placed in the option. The # is the number of options to add, in hexadecimal. The quoted parameter is the description of the option being added. rm Remove an option. The parameter lists the number of the options to remove in hexadecimal. mv Move an option. The first numeric parameter is the number of the option to move in hexadecimal. The second numeric parameter is the new number of the option being moved. -opt Display/modify the optional data associated with a driver or boot option. Followed either by the file name of thefile which contains the binary data to be
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associated with the driver or boot option optional data or else the quotedelimited data which will be associated with the driver or boot option optional data. KeyData The packed value associated with a hot-key. This is the equivalent of the EFI_KEY_DATA value in the UEFI specification. ScanCode This is the UEFI-defined Scan code portion of the EFI_INPUT_KEY struction. This value is directly associated with the preceding KeyData value and there may be 1 to 4 entries per the UEFI specification. When one instance of this parameter has a non-zero value, the paired UnicodeChar value will have a zero-based value. UnicodeChar This is the Unicode value for the character associated with the preceding KeyData value. There may be 1 to 4 entries per the UEFI specification. When one instance of this parameter has a non-zero value, the paired ScanCode value will have a zero-based value.

Description
Manages the boot and driver options stored in NVRAM. This command can display the Boot#### or Driver#### environment variables by using the dump option. The add option can be used to add a new Boot#### or Driver#### environment variable. The rm option can be used to delete a Boot#### or Driver#### environment variable, and finally, then mv option can be used to reorder the Boot#### and Driver#### environment variables. The add, rm, and mv options also update the BootOrder or DriverOrder environment variables as appropriate.

Examples
To display driver options: Shell> bcfg driver dump To display boot options: Shell> bcfg boot dump To display verbosely of boot options: Shell> bcfg boot dump -v To add a driver option #5 Shell> bcfg driver add 5 mydriver.efi "My Driver" To add a boot option #3 Shell> bcfg boot add 3 osloader.efi "My OS" To remove boot option #3 Shell> bcfg boot rm 3 To move boot option #3 to boot option #7 Shell> bcfg boot mv 3 7 To assign a CTRL-B hot-key to boot option #3.

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Shell> bcfg boot –opt 3 0x40000200 0 0x42

Status Codes Returned
SHELL_SUCCESS SHELL_NOT_FOUND SHELL_INVALID_PARAMETER SHELL_UNSUPPORTED SHELL_SECURITY_VIOLATION SHELL_OUT_OF_RESOURCES
The action was completed as requested. The requested option was not found. One of the passed in parameters was incorrectly formatted or its value was out of bounds. The action as requested was unsupported. This function was not performed due to a security violation There was insufficient free space for the request to be completed.

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cd
Summary
Displays or changes the current directory.

Usage cd [path]

Options path The relative or absolute directory path.

Description
This command changes the current working directory that is used by the UEFI Shell environment. If a file system mapping is specified, then the current working directory is changed for that device. Otherwise, the current working directory is changed for the current device. If path is not present, then the current working directory (including file system mapping) is displayed to standard out. The table below describes the conventions that are used to refer to the directory, its parent, and the root directory in the UEFI Shell environment.

Table 13 Conventions for Directory Names
Convention Description Refers to the current directory. Refers to the directory's parent. Refers to the root of the current file system.

. .. \

The current working directory is maintained in the environment variable %cwd%. See “Current Directory” (section 3.5) for more information.

Status Codes Returned
SHELL_SUCCESS SHELL_SECURITY_VIOLATION SHELL_INVALID_PARAMETER
The action was completed as requested. This function was not performed due to a security violation One of the passed in parameters was incorrectly formatted or its value was out of bounds.

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Examples
To change the current filesystem to the mapped fs0 filesystem: Shell> fs0: To change the current directory to subdirectory 'efi': fs0:\> cd efi To change the current directory to the parent directory (fs0:\): fs0:\efi\> cd .. To change the current directory to 'fs0:\efi\tools': fs0:\> cd efi\tools To change the current directory to the root of the current fs (fs0): fs0:\efi\tools\> cd \ fs0:\> To change volumes with cd will not work! For example: fs0:\efi\tools\> cd fs1:\ !!!! will not work !!!! must first type fs1: then cd to desired directory To move between volumes and maintain the current path. fs0:\> cd \efi\tools fs0:\efi\tools\> fs1: fs1:\> cd tmp fs1:\tmp> cp fs0:*.* . copies all of files in fs0:\efi\tools into fs1:\tmp directory

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cls
Summary
Clears the standard output and optionally changes the background color.

Usage cls [color]

Options color - New background color 0 - Black 1 - Blue 2 - Green 3 - Cyan 4 - Red 5 - Magenta 6 - Yellow 7 - Light gray

Description
This command clears the standard output device with an optional background color attribute. If color is not specified, then the background color does not change.

Status Codes Returned
SHELL_SUCCESS SHELL_INVALID_PARAMETER SHELL_SECURITY_VIOLATION SHELL_NOT_FOUND
The action was completed as requested. One of the passed in parameters was incorrectly formatted or its value was out of bounds. This function was not performed due to a security violation The requested file was not found.

Examples
To clear standard output without changing the background color: fs0:\> cls To clear standard output and change the background color to cyan: fs0:\> cls 3 To clear standard output and change the background to the default color: fs0:\> cls 0

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comp
Summary
Compares the contents of two files on a byte for byte basis.

Usage comp [-b] file1 file2

Options
-b file1 file2 - Display one screen at a time - First file name (directory name or wildcards not permitted) - Second file name (directory name or wildcards not permitted)

Description
This command compares the contents of two files in binary mode. It displays up to 10 differences between the two files. For each difference, up to 32 bytes from the location where the difference starts is dumped. It will exit immediately if the lengths of the compared files are different.

Status Codes Returned
SHELL_SUCCESS SHELL_NOT_EQUAL SHELL_INVALID_PARAMETER SHELL_SECURITY_VIOLATION SHELL_NOT_FOUND
The function operated as expected. The files were not identical. One of the passed in parameters was incorrectly formatted or its value was out of bounds. This function was not performed due to a security violation The requested file was not found.

Examples
To compare two files with different lengths: fs0:\> comp bios.inf legacy.inf Compare fs0:\bios.inf to fs0:\legacy.inf Difference #1: File sizes mismatch [difference(s) encountered] To compare two files with the same contents: fs0:\> comp bios.inf rafter.inf Compare fs0:\bios.inf to fs0:\rafter.inf [no difference encountered] To compare two files with the same length but different contents:

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fs0:\> comp bios.inf bios2.inf Compare fs0:\bios.inf to fs0:\bios2.inf Difference #1: File1: fs0:\bios.inf 00000000: 5F File2: fs0:\bios2.inf 00000000: 33 Difference #2: File1: fs0:\bios.inf 0000000C: 00 00 00 00 File2: fs0:\bios2.inf 0000000C: 25 32 03 03 [difference(s) encountered]

*_* *3* *....* *%2..*

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connect
Summary
Binds a driver to a specific device and starts the driver.

Usage connect [[DeviceHandle] [DriverHandle] | [-c] | [-r]]

Options
-r Recursively scan all handles and check to see if any loaded or embedded driver can match the specified device. If so, the driver will be bound to the device. Additionally, if more device handles are created during the binding, these handles will also be checked to see if a matching driver can bind to these devices as well. The process is repeated until no more drivers are able to connect to any devices. However, without the option, the newly created device handles will not be further bound to any drivers. -c Connect console devices found in the EFI global variables (see UEFI specification, chapter 3) DeviceHandle Device handle (a hexadecimal number). If not specified, then all device handles will be connected. DriverHandle Driver handle (a hexadecimal number). If not specified, then all matching drivers will be bound to the specified device. If specified, then this driver will have the highest priority.

Description
This command binds a driver to a specific device and starts the driver. If the -r flag is used, then the connection is done recursively until no further connections between devices and drivers are made. If the -c flag is used, then the connect command will bind the proper drivers to the console devices that are described in the EFI environment variables. The example below shows the typical output from the verbose help for this command. If only a single handle is specified and the handle has an EFI_DRIVER_BINDING_PROTOCOL on it, then the handle is assumed to be a driver handle. Otherwise, it is assumed to be a device handle. If no parameters are specified, then the command will attempt to bind all proper drivers to all devices without recursion. Each connection status will be displayed.

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Status Codes Returned
SHELL_SUCCESS SHELL_SECURITY_VIOLATION SHELL_INVALID_PARAMETER
The action was completed as requested. This function was not performed due to a security violation One of the passed in parameters was incorrectly formatted or its value was out of bounds.

Examples
• To connect all drivers to all devices recursively: Shell> connect -r To display all connections: Shell> connect ConnectController(1) : Status = Success ConnectController(2) : Status = Success ConnectController(3) : Status = Success ... ConnectController(3D) : Status = Success

•

• To connect drivers with 0x17 as highest priority to all the devices they can manage: Shell> connect 17 • To connect all possible drivers to device 0x19: Shell> connect 19 To connect drivers with 0x17 as highest priority to device 0x19 they can manage: Shell> connect 19 17 To connect console devices described in the UEFI Shell environment variables: Shell> connect -c

•

•

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cp
Summary
Copies one or more source files or directories to a destination.

Usage cp [-r] [-q] src [src...] [dst]

Options src Source file/directory name (wildcards are permitted) dst Destination file/directory name (wildcards are not permitted). If not specified, then the current working directory is assumed to be the destination. If there are more than one directory specified, then the last is always assumed to be the destination. -r Recursive copy. -q Quiet copy (no prompt)

Description
This command copies one or more source files or directories to a destination. If the source is a directory, the -r flag must be specified. If -r is specified, then the source directory will be recursively copied to the destination (which means that all subdirectories will be copied). If a destination is not specified, then the current working directory is assumed to be the destination. If any target file (not directory) already exists, there will be a prompt asking the user to confirm replacing the file. The following four choices are available: • • • • Yes: Replace the file. No: Do not replace the file. All: Replace the existing files in all subsequent cases. Cancel: Do not replace any existing files in all subsequent cases.

If there are multiple source files/directories, the destination must be a directory. If an error occurs, then the copying process will stop immediately. When executing in a script, the default is –q.

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When copying to another directory, the directory must already exist.

Status Codes Returned
SHELL_SUCCESS SHELL_INVALID_PARAMETER SHELL_OUT_OF_RESOURCES SHELL_SECURITY_VIOLATION SHELL_WRITE_PROTECTED
The action was completed as requested. One of the passed in parameters was incorrectly formatted or its value was out of bounds. There was insufficient space to save the requested file at the destination. This function was not performed due to a security violation An attempt was made to create a file on media that was writeprotected.

Examples
Note: 1. ‘-r’ must be specified if src is a directory. If '-r' is specified, then the source directory will be recursively copied to the destination. Src itself will be copied. ???? • To display the contents of current directory first of all: fs0:\> ls Directory of: fs0:\ 06/18/01 06/18/01 06/18/01 06/13/01 06/13/01 06/18/01 06/18/01 01:02p 512 01:02p 512 01:02p 512 10:00a 28,739 10:00a 32,838 08:04p 29 08:05p 512 3 File(s) 61,606 bytes 4 Dir(s) efi test1 test2 IsaBus.efi IsaSerial.efi temp.txt test

•

To copy a file in the same directory, but change the file name: fs0:\> cp temp.txt readme.txt copying fs0:\temp.txt -> fs0:\readme.txt - [ok] To copy multiple files to another directory: fs0:\> cp temp.txt isaBus.efi \test copying fs0:\temp.txt -> fs0:\test\temp.txt - [ok] copying fs0:\isaBus.efi -> fs0:\test\IsaBus.efi - [ok] To copy multiple directories recursively to another directory:

•

•

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fs0:\> cp -r test1 test2 boot \test copying fs0:\test1 -> fs0:\test\test1 copying fs0:\test1\test1.txt -> fs0:\test\test1\test1.txt - [ok] copying fs0:\test2 -> fs0:\test\test2 copying fs0:\test2\test2.txt -> fs0:\test\test2\test2.txt - [ok] copying fs0:\boot -> fs0:\test\boot copying fs0:\boot\shell.efi -> fs0:\test\boot\shell.efi - [ok] • To see the results of the above operations: fs0:\> ls \test Directory of: fs0:\test 06/18/01 06/18/01 01/28/01 01/28/01 01/28/01 01/28/01 01/28/01 01:01p 512 01:01p 0 08:21p 512 08:21p 512 08:21p 512 08:23p 29 08:23p 28,739 2 File(s) 28,828 bytes 5 Dir(s) . .. test1 test2 boot temp.txt IsaBus.efi

Shell>

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date
Summary
Displays and sets the current date for the system.

Usage date [mm/dd/[yy]yy][-sfo]

Options mm Month of the date to be set (1-12) dd Day of the date to be set (1-31) yy/yyyy Year of the date to be set. If only two digits, then 9x = 199x, otherwise 20xx. -sfo Standard-format output. See "Related Definitions" below.

Description
This command displays and/or sets the current date for the system. If no parameters are used, it shows the current date. If a valid month, day, and year are provided, then the system's date will be updated. Detailed rules are listed below: Except for numeric characters and /, all other characters in the argument are invalid. The Shell will report an error if the number is in the wrong month/date/year range. Space before or after the numeric character is not allowed. Inserting a space into the number is invalid. Repeated zeros are allowed before the number. For example: Shell > date 0000008/000004/000097 Shell > date 08/04/2097 Shell > The year range is greater than or equal to 1998. Two numeric characters indicate the year. Numbers below 98 are regarded as 20xx, and numbers equal to or above 98 are regarded as 19xx. 00 means 2000. For example:

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Shell > date 8/4/97 Shell > date 08/04/2097 Shell > Shell > date 8/4/98 Shell > date 08/04/1998 Shell > The range of valid years is from 1998–2099.

Standard-Format Output
The standard-format from the date command has a single table: Date, with the following columns:

Table 14Date Command Table
Column 2 3 4 Day (from 1-31) Month (from 1-12) Year (from 1998-2099) Description

Status Codes Returned
SHELL_SUCCESS SHELL_DEVICE_ERROR SHELL_SECURITY_VIOLATION SHELL_INVALID_PARAMETER
The action was completed as requested. There was a hardware error preventing the completion of this command This function was not performed due to a security violation One of the passed in parameters was incorrectly formatted or its value was out of bounds.

Examples
• To display the current date in the system: fs0:\> date 06/18/2001 To set the date with long year format: fs0:\> date 01/01/2050 fs0:\> date 01/01/2050 To set the date with short year format: fs0:\> date 06/18/01 fs0:\> date 06/18/2001

•

•

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dblk
Summary
Displays the contents of one or more blocks from a block device.

Usage dblk device [lba] [blocks] [-b]

Options device Block device name lba Index of the first block to be displayed (a hexadecimal number). The default is 0. blocks Number of blocks to be displayed (a hexadecimal number). The default is 0. If larger than 0x10, then only 0x10 are displayed. -b Display one screen at a time.

Description
This command displays the contents of one or more blocks from a block device. lba and blocks should be typed in hex value. If lba is not specified, block #0 is assumed. If blocks is not specified, then on1y 1 block will be displayed. The maximum number of blocks that can be displayed at one time is 0x10. If an MBR is found on the block, the partition information will be printed after all the block contents have been displayed. If the block is a FAT partition, some FAT parameters will be displayed (label, systemid, oemid, sectorsize, clustersize, media etc) after all the blocks have been displayed.

Examples
• To display one block of blk0, beginning from block 0: Shell>dblk blk0 To display one block of fs0, beginning from block 0x2: Shell>dblk fs0 2 To display 0x5 blocks of fs0, beginning from block 0x12: Shell>dblk fs0 12 5 To display 0x10 blocks of fs0, beginning from block 0x12: Shell>dblk fs0 12 10 The attempt to display more than 0x10 blocks will display only 0x10 blocks:
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•

•

•

•
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Shell>dblk fs0 12 20 • To display one block of blk2, beginning from the first block (blk0):

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fs1:\tmps1> dblk blk2 0 1 LBA 0000000000000000 Size 00000000: EB 3C 90 4D 53 *. devtree

• To display the tree of all devices below device 28 compliant with the UEFI Driver Model: Shell> devtree 28 • To display the tree of all devices compliant with the UEFI Driver Model one screen at a time: Shell> devtree -b

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dh
Summary
Displays the device handles in the UEFI environment.

Usage dh [-l ] [handle | -p ] [-d] [-v]

Options handle Specific handle to dump information about (a hexadecimal number). If not present, then all information will be dumped. -p Dumps all handles of a protocol specified by the GUID. -d Dumps UEFI Driver Model-related information. -l Dumps information using the language codes, as described in Appendix M of the UEFI specification. -sfo Displays information as described in “Standard-Format Output” below. -v, -verbose Dumps verbose information about a specific handle.

Description
This command displays the device handles in the EFI environment. If this command is used with a specific handle number, the details of all the protocols that are associated with that device handle are displayed. Otherwise, the -p option can be used to list the device handles that contain a specific protocol. If neither –p or handle is specified, then all handles will be displayed.

Status Codes Returned
SHELL_SUCCESS SHELL_SECURITY_VIOLATION SHELL_INVALID_PARAMETER
The action was completed as requested. This function was not performed due to a security violation One of the passed in parameters was incorrectly formatted or its value was out of bounds.

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Examples
To display all handles and display one screen at a time: Shell> dh -b Handle dump 1: Image(DXE Core) 2: FwVol FwFileSys FwVolBlk DevPath(MemMap(11:1B500001D4FFC8)) 3: Image(Ebc) 4: DevPath(MemMap(11:1CA0000-1CB0000)) 5: Image(WinNtThunk) 6: WinNtThunk DevPath(..76F3-11D4-BCEA-0080C73C8881)) 7: Image(WinNtBusDriver) DriverBinding ... To display the detailed information on handle 0x30: Shell> dh 30 Handle 30 (01AF5308) IsaIo ROM Size......: 00000000 ROM Location..: 00000000 ISA Resource List : IO : 000003F8-000003FF Attr : 00000000 INT : 00000004-00000000 Attr : 00000000 dpath PNP Device Path for PnP HID A0341D0, UID 0x0 Hardware Device Path for PCI PNP Device Path for PnP HID 50141D0, UID 0 AsStr: 'Acpi(PNP0A03,0)/Pci(1F|0)/Acpi(PNP0501,0)' To display all handles with 'diskio' protocol: Shell> dh -p diskio Handle dump by protocol 'Diskio' 15: DiskIo BlkIo DevPath(..i(3|1)/Ata(Secondary,Master)) 16: DiskIo BlkIo DevPath(..,1)/PCI(0|0)/Scsi(Pun0,Lun0)) 44: DiskIo BlkIo Fs DevPath(..ABD0-01C0-507B-9E5F8078F531)) ESP 45: DiskIo BlkIo Fs DevPath(..i(Pun0,Lun0)/HD(Part4,SigG0)) ESP 17: DiskIo BlkIo DevPath(..PCI(3|1)/Ata(Primary,Master)) To display all handles with 'Image' protocol and break when the screen is full:

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Shell> dh -p Image -b Handle dump by protocol 'image' 1: Image(DXE Core) 5: Image(WinNtThunk) 7: Image(WinNtBusDriver) DriverBinding 8: Image(Metronome) A: Image(IsaBus) DriverBinding B: Image(WinNtConsole) DriverBinding ...

Standard-Format Output
When using the –sfo command-line option, the dh shell command will produce one of two tables: HandlesInfo or HandleInfo. The table columns are described in the following table:

Table 16 dh Standard Formatted Output (HandlesInfo)
Column Number 2 3 4 5 6 Description Driver Name. Name of driver producing the handle. Controller Name. Name of controller producing the handle. Handle Number. Integer handle number. Device Path.Device path associated with the handle. Protocol Identifiers. Semicolon-delimited list of protocol identifiers or GUIDs.

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dir
Summary
An internal alias for the ls command.

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disconnect
Summary
Disconnects one or more drivers from the specified devices.

Usage disconnect DeviceHandle [DriverHandle [ChildHandle]]

Options
DeviceHandle Device handle (a hexadecimal number). If not specified, then disconnect DriverHandle. DriverHandle Driver handle (a hexadecimal number) ChildHandle Child handle of a device (a hexadecimal number). If not specified, then all child handles of DeviceHandle will be disconnected. -r Disconnect all drivers from all devices.

Description
This command disconnects one or more drivers from the specified devices. If the -r option is used, all drivers are disconnected from all devices in the system. The following example is the typical output from the help for this command.

Status Codes Returned
SHELL_SUCCESS SHELL_SECURITY_VIOLATION SHELL_INVALID_PARAMETER The action was completed as requested. This function was not performed due to a security violation One of the passed in parameters was incorrectly formatted or its value was out of bounds.

Examples
• To disconnect all drivers from all devices:

Shell> disconnect -r
• To disconnect all drivers from device 0x28:

fs0:\> disconnect 28
• 110 To disconnect driver 0x17 from device 0x28: Version 2.0

fs0:\> disconnect 28 17
• To disconnect driver 0x17 from controlling the child 0x32 of device 0x28

fs0:\> disconnect 28 17 32

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dmem
Summary
Displays the contents of system or device memory.

Usage dmem [-b] [address] [size] [-MMIO]

Options address Starting address in hexadecimal format size Number of bytes to display in hexadecimal format -b Display one screen at a time -MMIO Forces address cycles to the PCI bus

Description
This command displays the contents of system memory or device memory. address and size should be typed in hex value. If Address is not specified, then the contents of the EFI System Table are displayed. Otherwise, memory starting at Address is displayed. Size specifies the number of bytes to display. If Size is not specified, then it defaults to 512 bytes. If MMIO is not specified, then main system memory is displayed. Otherwise, device memory is displayed through the use of the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.

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Examples
* To display the EFI system table pointer entries: fs0:\> dmem Memory Address 000000003FF7D808 200 Bytes 3FF7D808: 49 42 49 20 53 59 53 54-02 00 01 SYST....x...* 3FF7D818: 5C 3E 6A FE 00 00 00 00-88 2E 1B *\>j........?....* 3FF7D828: 26 00 0C 00 00 00 00 00-88 D3 1A *&..........?....* 3FF7D838: A8 CE 1A 3F 00 00 00 00-88 F2 1A *...?.......?....* 3FF7D848: 28 EE 1A 3F 00 00 00 00-08 DD 1A *(..?.......?....* 3FF7D858: A8 EB 1A 3F 00 00 00 00-18 C3 3F *...?..........* 3FF7D868: 00 4B 3F 3F 00 00 00 00-06 00 00 *.K............* 3FF7D878: 08 DA F7 3F 00 00 00 00-70 74 61 *...?....ptal....* 3FF7D888: 00 00 00 00 00 00 00 00-00 00 00 *................* 3FF7D898: 00 00 00 00 00 00 00 00-00 00 00 *................* 3FF7D8A8: 00 00 00 00 00 00 00 00-00 00 00 *................* 3FF7D8B8: 00 00 00 00 00 00 00 00-00 00 00 *................* 3FF7D8C8: 00 00 00 00 00 00 00 00-00 00 00 *................* 3FF7D8D8: 00 00 00 00 00 00 00 00-00 00 00 *................* 3FF7D8E8: 00 00 00 00 00 00 00 00-00 00 00 *................* 3FF7D8F8: 00 00 00 00 00 00 00 00-70 68 06 *........ph.0....* 3FF7D908: 65 76 6E 74 00 00 00 00-02 02 00 *evnt.......`....* 3FF7D918: 18 6F 1A 3F 00 00 00 00-10 E0 3F *.o.?..........* 3FF7D928: 10 00 00 00 00 00 00 00-40 C0 12 *........@..?....* 3FF7D938: 10 80 13 3F 00 00 00 00-00 00 00 *...?............* 3FF7D948: 00 00 00 00 00 00 00 00-40 7D 3F *........@.....* 3FF7D958: 50 6F 1A 3F 00 00 00 00-00 00 00 *Po.?............* 3FF7D968: 00 00 00 00 00 00 00 00-00 00 00 *................* 3FF7D978: 00 00 00 00 00 00 00 00-70 74 61 *........ptal....* 3FF7D988: 00 00 00 00 00 00 00 00-00 00 00 *................* 3FF7D998: 00 00 00 00 00 00 00 00-00 00 00 *................* 3FF7D9A8: 00 00 00 00 00 00 00 00-00 00 00 *................* 3FF7D9B8: 00 00 00 00 00 00 00 00-00 00 00 *................* 3FF7D9C8: 00 00 00 00 00 00 00 00-00 00 00 *................* 3FF7D9D8: 00 00 00 00 00 00 00 00-00 00 00 *................*
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00 78 00 00 00 3F 00 00 00 00 3F 00 00 00 00 3F 00 00 00 00 3F 00 00 00 00 3F 00 00 00 00 00 00 00 00 00 6C 88 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 30 88 00 00 00 60 00 00 00 00 3F 00 00 00 00 3F 00 00 00 00 00 00 00 00 00 3F 00 00 00 00 00 00 00 00 00 00 00 00 00 00 6C 88 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

*IBI

3FF7D9E8: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 *................* 3FF7D9F8: 00 00 00 00 00 00 00 00-70 68 06 30 A0 00 00 00 *........ph.0....* Valid EFI Header at Address 000000003FF7D808 -------------------------------------------System: Table Structure size 00000078 revision 00010002 ConIn (3F1AD388) ConOut (3F1AF288) StdErr (3F1ADD08) Runtime Services 000000003F3FC318 Boot Services 000000003F3F4B00 SAL System Table 000000003FF22760 ACPI Table 000000003FFD9FC0 ACPI 2.0 Table 00000000000E2000 MPS Table 000000003FFD0000 SMBIOS Table 00000000000F0020 * To display memory contents from 1af3088 with size of 16 bytes: Shell> dmem 1af3088 16 Memory Address 0000000001AF3088 16 Bytes 01AF3088: 49 42 49 20 53 59 53 54-00 00 02 00 18 00 00 00 *IBI SYST........* 01AF3098: FF 9E D7 9B 00 00 *......* * To display memory mapped IO contents from 1af3088 with size of 16 bytes: Shell> dmem 1af3088 16 -MMIO

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dmpstore
Summary
Manages all UEFI NVRAM variables.

Usage dmpstore [-b] [-d] [-all | ([variable] [–guid guid])] dmpstore [-all | ([variable] [–guid guid])] -s file dmpstore [-all | ([variable] [–guid guid])] -l file

Options
-b Display one screen at a time variable Specifies the name of the variable name. May be a literal name or a pattern as specified in the MetaiMatch() function of the EFI_UNICODE_COLLATION2_PROCOOL. -guid Specifies the GUID of the variables to be displayed. The GUID has the standard text format. If guid is not specified and –all is not specified, then the EFI_GLOBAL_VARIABLE GUID is assumed. -all Indicates that all variables should be dumped, including those with a different GUID that EFI_GLOBAL_VARIABLE. -d Delete variables -s Save variables to file -l Load and set variables from file

Description
This command is used to manage the UEFI NVRAM variables. The variables to display or delete depend on the command line options, as specified in the following table:

Table 17 Variable command line options
Variable ----Version 2.0 115 GUID -----all ----Description All variables with the GUID EFI_GLOBAL_VARIABLE will be operated on. All variables (regardless of GUID or name) will be operated on.

--X X

X --X

-------

All variables with the specified GUID will be operated on. The variable with the GUID EFI_GLOBAL_VARIABLE and the name(s) Variable will be operated on. The variable with the specified GUID and name Variable will be operated on.

The variable value is printed as hexadecimal dump. Option –d is used to delete variables. Option –s and –l are used to save and load variables to and from file. The variable name can be specified when using these variables so that the operation only takes effect on that variable.

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drivers
Summary
Displays a list of information for drivers that follow the UEFI Driver Model in the UEFI environment.

Usage drivers [-l XXX]

Options
-l Displays drivers using the language code XXX, which has the format specified by Appendix M of the UEFI specification. -sfo Displays information as described in “Standard-Format Output” below.

Description
This command displays a list of information for drivers that follow the UEFI Driver Model in the UEFI environment. The list includes: • • The handle number of the EFI driver. The version number of the EFI driver.

• The driver type. A B in this column indicates a bus driver, and D indicates a device driver. • • • • • • Indicates that the driver supports the Driver Configuration Protocol. Indicates that the driver supports the Driver Diagnostics Protocol. The number of devices that this driver is managing. The number of child devices that this driver has produced. The name of the driver from the Component Name Protocol. The file path from which the driver was loaded.

Status Codes Returned
SHELL_SUCCESS SHELL_SECURITY_VIOLATION SHELL_INVALID_PARAMETER
The action was completed as requested. This function was not performed due to a security violation One of the passed in parameters was incorrectly formatted or its value was out of bounds.

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Examples
• To display the list: Shell> drivers T D D Y C I R P F A V VERSION E G G #D #C DRIVER NAME NAME === ======= = = = == == ===================================== ========== 39 00000010 D - - 1 - Platform Console Management Driver ConPlatform 3A 00000010 D - - 1 - Platform Console Management Driver ConPlatform 3B 00000010 B - - 1 1 Console Splitter Driver ConSplitter 3C 00000010 ? - - - - Console Splitter Driver ConSplitter 3D 00000010 B - - 1 1 Console Splitter Driver ConSplitter 3E 00000010 ? - - - - Console Splitter Driver ConSplitter 42 00000010 D - - 1 - UGA Console Driver GraphicsConsole 43 00000010 ? - - - - Serial Terminal Driver Terminal 44 00000010 D - - 1 - Generic Disk I/O Driver 45 00000010 D - - 1 - FAT File System Driver 48 00000010 ? - - - - ISA Bus Driver 49 00000010 ? - - - - ISA Serial Driver IsaSerial 4C 00000010 B - - 1 1 PCI Bus Driver 55 00000010 D X X 1 - Windows Block I/O Driver WinNtBlockIo 56 00000010 ? - - - - Windows Text Console Driver WinNtConsole 57 00000010 ? - - - - Windows Serial I/O Driver WinNtSerialIo 58 00000010 D - - 1 - Windows Simple File System Driver WinNtSimpleFileSystem 59 00000010 B - - 1 3 Windows Bus Driver WinNtBusDriver 5F 00000010 D - - 1 - Windows Universal Graphics Adapter WinNtUga

IMAGE

DiskIo Fat IsaBus PciBus

Standard-Format Output
The standard-format output for the drivers command produces a single table: Drivers. The following columns are described:

Table 18 Drivers command table
Column Number 2 3 4 5 6 Description Handle Number. The handlenumber of the UEFI driver. Version Number. The version number of the UEFI Driver Driver Type. Either ‘B’ for bus driver or ‘D’ for device driver. Configuration Protocol Support. Either “Y” (Yes) or “N” (No) Driver Protocol Support. Either ‘Y’ (Yes) or ‘N’ (No)

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7 8 9 10

Devices Managed. The number of devices that this driver is managing. Child Devices. The number of child devices that this driver has produced. Driver Name. The name of the driver from the Component Name Protocol. Driver Image Path. The device path from which the driver was loaded.

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drvcfg
Summary
Configures the driver using the platform’s underlying configuration infrastructure.

Usage drvcfg [-l XXX] [-c] [-f |-v|-s] [DriverHandle [DeviceHandle [ChildHandle]]] [-i filename] [-o filename]

Options
Type The type of default configuration options to force on the controller. 0 - Standard Defaults. 1 - Manufacturing Defaults. 2 - Safe Defaults. 4000-FFFF - Custom Defaults. DriverHandle The handle of the driver to configure DeviceHandle The handle of a device that DriverHandle is managing ChildHandle The handle of a device that is a child of DeviceHandle -c Configure all child devices -l Configure using the ISO 3066 language specified by XXX -f Force defaults -v Validate options -s Set options -i Receive configuration updates from an input file

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-o Export the settings of the specified driver instance to a file

Description
This command invokes the platform’s Configuration infrastructure. The table below describes the values for the Type parameter. Other values depend on the driver’s implementation.

Table Default Values for the “Type” Parameter
Value 0x0000 0x0001 0x0002 Type of Default Standard Defaults Manufacturing Defaults Safe Defaults Description Places a controller in a state that is prepared for normal operation in a platform. Optional type that places the controller in a configuration that is suitable for a manufacturing and test environment. Optional type that places a controller in a safe configuration that has the greatest probability of functioning correctly in a platform. Specification reserved range of default values

0x0003 – 0x3FFF 0x4000 – 0xFFFF

Reserved

Custom Defaults

Optional type that places the controller in a configuration that has custom characteristics.

Status Codes Returned
SHELL_SUCCESS SHELL_SECURITY_VIOLATION SHELL_UNSUPPORTED SHELL_INVALID_PARAMETER
The action was completed as requested. This function was not performed due to a security violation The action as requested was unsupported. One of the passed in parameters was incorrectly formatted or its value was out of bounds.

Examples
To display the list of devices that are available for configuration: Shell> drvcfg To display the list of devices and child devices that are available for configuration: Shell> drvcfg –c To force defaults on all devices: Shell> drvcfg –f 0 To force defaults on all devices that are managed by driver 0x17:

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Shell> drvcfg –f 0 17 To force defaults on device 0x28 that is managed by driver 0x17: Shell> drvcfg –f 0 17 28 To force defaults on all child devices of device 0x28 that is managed by driver 0x17: Shell> drvcfg –f 0 17 28 –c

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To force defaults on child device 0x30 of device 0x28 that is managed by driver 0x17: Shell> drvcfg –f 0 17 28 30 To validate options on all devices: Shell> drvcfg –v To validate options on all devices that are managed by driver 0x17: Shell> drvcfg –v 17 To validate options on device 0x28 that is managed by driver 0x17: Shell> drvcfg –v 17 28 To validate options on all child devices of device 0x28 that is managed by driver 0x17: Shell> drvcfg –v 17 28 –c To validate options on child device 0x30 of device 0x28 that is managed by driver 0x17: Shell> drvcfg –v 17 28 30 To set options on device 0x28 that is managed by driver 0x17: Shell> drvcfg –s 17 28 To set options on child device 0x30 of device 0x28 that is managed by driver 0x17: Shell> drvcfg –s 17 28 30 To set options on device 0x28 that is managed by driver 0x17 in English: Shell> drvcfg –s 17 28 –l eng To set options on device 0x28 that is managed by driver 0x17 in Spanish: Shell> drvcfg –s 17 28 –l spa

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drvdiag
Summary
Invokes the Driver Diagnostics Protocol.

Usage drvdiag [-c] [-l XXX] [-s|-e|-m] [DriverHandle [DeviceHandle [ChildHandle]]]

Options
DriverHandle The handle of the driver to diagnose DeviceHandle The handle of a device that DriverHandle is managing ChildHandle The handle of a device that is a child of DeviceHandle -c Diagnose all child devices -l Diagnose using the ISO 639-2 language specified by XXX -s Run diagnostics in standard mode -e Run diagnostics in extended mode -m Run diagnostics in manufacturing mode

Description
This command invokes the Driver Diagnostics Protocol.

Status Codes Returned
SHELL_SUCCESS SHELL_SECURITY_VIOLATION SHELL_INVALID_PARAMETER
The action was completed as requested. This function was not performed due to a security violation One of the passed in parameters was incorrectly formatted or its value was out of bounds.

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Examples
To display the list of devices that are available for diagnostics: Shell> drvdiag To display the list of devices and child devices that are available for diagnostics: Shell> drvdiag –c To run diagnostics in standard mode on all devices: Shell> drvdiag –s To run diagnostics in standard mode on all devices in English: Shell> drvdiag –s –l eng To run diagnostics in standard mode on all devices in Spanish: Shell> drvdiag –s –l spa To run diagnostics in standard mode on all devices and child devices: Shell> drvdiag –s –c To run diagnostics in extended mode on all devices: Shell> drvdiag –e To run diagnostics in manufacturing mode on all devices: Shell> drvdiag –m To run diagnostics in standard mode on all devices managed by driver 0x17: Shell> drvdiag –s 17 To run diagnostics in standard mode on device 0x28 managed by driver 0x17: Shell> drvdiag –s 17 28 To run diagnostics in standard mode on all child devices of device 0x28 managed by driver 0x17: Shell> drvdiag –s 17 28 –c To run diagnostics in standard mode on child device 0x30 of device 0x28 managed by driver 0x17: Shell> drvdiag –s 17 28 30

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echo
Summary
Controls whether or not script commands are displayed as they are read from the script file and prints the given message to the display.

Usage echo [-on|-off] echo [message]

Options message Message to display -on Enables display when reading commands from script files. -off Disables display when reading commands from script files.

Description
The first form of this command controls whether or not script commands are displayed as they are read from the script file. If no argument is given, the current "on" or "off" status is displayed. The second form prints the given message to the display.

Note
This command does not change the value of the environment variable lasterror.

Status Codes Returned
SHELL_SUCCESS SHELL_SECURITY_VIOLATION
The action was completed as requested. This function was not performed due to a security violation

Examples
• To display a message string of 'Hello World': fs0:\> echo Hello World Hello World To turn command echoing on: fs0:\> echo -on To execute HelloWorld.nsh, and display when reading lines from the script file:

•

•

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fs0:\> HelloWorld.nsh +HelloWorld.nsh> echo Hello World Hello World • To turn command echoing off: fs0:\> echo -off To display the current echo setting: fs0:\> echo Echo is off

•

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edit
Summary
Full screen editor for ASCII or UCS-2 files.

Usage edit [file]

Options file Name of file to be edited. If none is specified, then an empty file will be created with a default file name.

Description
This command allows a file to be edited using a full screen editor. The editor supports both UCS-2 and ASCII file types. The following example shows typical output for help on this command.

Examples
• To edit the 'shell.log' file: fs0:\> edit shell.log

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eficompress
Summary
Compress a file using EFI Compression Algorithm.

Usage eficompress infile outfile

Options infile outfile - Filename for uncompressed input file - Filename for compressed output file

Description
This command is used to compress a file using EFI Compression Algorithm and write the compressed form out to a new file.

Examples
• To compress a file named ‘uncompressed’ to file ‘compressed’: fs0:\> eficompress uncompressed compressed

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efidecompress
Summary
Decompress a file using EFI Decompression Algorithm.

Usage efidecompress infile outfile

Options infile Filename of compressed input file outfile Filename of decompressed output file

Description
This command is used to decompress a file using EFI Decompression Algorithm and write the decompressed form out to a new file.

Examples
• To decompress a file named ‘compressed’ to file ‘uncompressed’: fs0:\> efidecompress compressed uncompressed

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exit
Summary
Exits the UEFI Shell or the current script.

Usage exit [/b] [exit-code]

Options
/b Indicates that only the current UEFI shell script should be terminated. Ignored if not used within a script. exit-code If exiting a UEFI shell script, the value that will be placed into the environment variable lasterror. If exiting an instance of the UEFI shell, the value that will be returned to the caller. If not specified, then 0 will be returned.

Description
This command exits the UEFI Shell or, if /b is specified, the current script.

Status Codes Returned
0 exit-code Exited normally The value specified as an option.

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for
Usage
for %indexvar in set command [arguments] [command [arguments]] … endfor for %indexvar run (start end [step]) command [arguments] [command [arguments]] … endfor

Description
The for command executes one or more commands for each item in a set of items. The set may be text strings or filenames or a mixture of both, separated by spaces (if not in a quotation). If the length of an element in the set is between 0 and 256, and if the string contains wildcards, the string will be treated as a file name containing wildcards, and be expanded before command is executed. If after expansion no such files are found, the literal string itself is kept. Indexvar is any alphabet character from ‘a’ to ‘z’ or ‘A’ to ‘Z’, and they are case sensitive. It should not be a digit (0-9) because %digit will be interpreted as a positional argument on the command line that launches the script. The namespace for index variables is separate from that for environment variables, so if indexvar has the same name as an existing environment variable, the environment variable will remain unchanged by the for loop. Each command is executed once for each item in the set, with any occurrence of %indexvar in the command replacing with the current item. In the second format of for … endfor statement, indexvar will be assigned a value from start to end with an interval of step. start and end can be any integer whose length is less than 7 digits excluding sign, and it can also applied to step with one exception of zero. step is optional, if step is not specified it will be automatically determined by following rule, if start echo –off file1.txt exists file2.txt exists

Theoretically it is legal for 2 nested for commands to use the same alphabet letter as their index variable, for instance, a. # # Sample for loop from 1 to 3 with step 1 # echo -off for %a run (1 3) echo %a endfor # # Sample for loop from 3 down to 1 with step -1 # echo -off for %a run (3 1 -1) echo %a endfor # # Sample for loop – 2 nested for using same index variable # echo -off for %a in value1 value2 for %a in value3 value4 echo %a endfor endfor When processing first for and before seeing the endfor, the index variable %a has the value “value1”, so in second for, the %a has been already defined and it will be replaced with the current value of %a. The string after substitution becomes for value1 in value3 value4, which is not a legal for command. Thus only when the value of %a is also a single alphabet letter, the script will be executed without error. If 2 independent for commands use the same index variable, when the second for is encountered, the first for has already freed the variable so there’ll be no problem in this case.

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getmtc
Usage
getmtc

Description
This command displays the current monotonic counter value. The lower 32 bits increment every time this command is executed. Every time the system is reset, the upper 32 bits will be incremented, and the lower 32 bits will be reset to 0. The following example is typical output from help for this command.

Status Codes Returned
SHELL_SUCCESS SHELL_DEVICE_ERROR SHELL_SECURITY_VIOLATION
The action was completed as requested. The underlying device was not working correctly. This function was not performed due to a security violation

Examples fs0:\> getmtc 100000000 fs0:\> getmtc 100000001

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goto
Usage
goto label

Description
The goto command directs script file execution to the line in the script file after the given label. The command is not supported from the interactive shell. A label is a line beginning with a colon (:). It can appear either after the goto command, or before the goto command. The search for label is done forward in the script file, from the current file position. If the end of the file is reached, the search resumes at the top of the file and continues until label is found or the starting point is reached. If label is not found, the script process terminates and an error message is displayed. If a label is encountered but there is no goto command executed, the label lines are ignored. Using goto command to jump into another for loop is not allowed, but jumping into an if statement is legal.

Note
The goto command is only valid in script files.

Examples
# This is a script goto Done … :Done cleanup.nsh

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guid
Summary
Displays all registered EFI GUIDs.

Usage guid [-b]

Options
-b Display one screen at a time

Description
This command displays a list of all the GUIDs that have been registered with the UEFI environment.

Examples
Note: 1. Only displays the GUIDs included in the core EFI build at the time the core was built. Additional GUIDs may have been added by the BIOS integrator. Any GUIDs that are not in the original core build or were added by a new protocol loaded by the user will show up as an Unknown Device. 2. The GUID with a '*' at end means that there will probably be dump information or token available for the protocol to this GUID. The 'dh' command can be used to dump this information. fs0:\> guid -b DevIo diskio blkio txtin txtout fs load image ... Examples Shell> exit : : : : : : : : AF6AC311-84C3-11D2-8E3C-00A0C969723B CE345171-BA0B-11D2-8E4F-00A0C969723B 964E5B21-6459-11D2-8E39-00A0C969723B 387477C1-69C7-11D2-8E39-00A0C969723B 387477C2-69C7-11D2-8E39-00A0C969723B 964E5B22-6459-11D2-8E39-00A0C969723B 56EC3091-954C-11D2-8E3F-00A0C969723B 5B1B31A1-9562-11D2-8E3F-00A0C969723B

* * *

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help
Summary
Displays the list of commands that are built into the UEFI Shell.

Usage help [cmd | pattern | special] [-usage] [-verbose] [-section sectionname][-b]

Options cmd Command to display help about. pattern Pattern which describes the commands to be displayed. special Displays a list of the special characters used in the shell command line. -usage Display the usage information for the command. The same as specifying – section:NAME and –section:SYNOPSIS -section sectionname Display the specified section of the help information. Standard section names can be found in Appendix B.

Description
The help command displays information about one or more shell commands. If no other options are specified, each command will be displayed along with a brief description of its function. If –verbose is specified, then all help information for the specified commands. If –section is specified, only the help section specified will be displayed (see below). If –usage is specified, then the command, a brief description and the usage will be displayed. The help text is gathered from UCS-2 text files found in the directory where the shell or shell command executable was located. The files have the name commandname.man, where command-name is the name of the shell command. The files follow a sub-set of the MAN page format, as described below. If no option is specified, then only the NAME section of the page is reproduced.

Status Codes Returned
0 1 The help was displayed No command help was displayed

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Examples
To display the list of commands in the UEFI Shell and break after one screen: Shell> help –b ? - Displays commands list or verbose help of a command alias - Displays, creates, or deletes aliases in the UEFI Shell attrib - Displays or changes the attributes of files or directories cd - Displays or changes the current directory cls - Clears the standard output with an optional background color connect - Binds an EFI driver to a device and starts the driver copy - Copies one or more files/directories to another location ... To display help information of a Shell command - ls: Shell> help ls Shell> ? ls Shell> ls -? To display the list of commands that start with character ‘p’: Shell> help p* pause – Prints a message and suspends for keyboard input

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hexedit
Summary
Full screen hex editor for files, block devices, or memory.

Usage hexedit [[-f] filename| [-d diskname offset size] | [-m address size]]

Options
-f Name of file to edit -d Disk block to edit: DiskName - Name of disk to edit (for example fs0) Offset Size -m Memory region to edit: Address - Starting 32-bit memory address (beginning from 0) Size - Size of memory region to be edited in bytes - Starting block number (beginning from 0) - Number of blocks to be edited

Description
This command allows a file, block device, or memory region to be edited. The region being edited is displayed as hexadecimal bytes, and the contents can be modified and saved. The following example shows typical output for help on this command.

Examples
• To edit a file in hex mode: fs0:\> hexedit test.bin To edit block device fs0 starting at block 0 with size of 2 blocks: fs0:\> hexedit -d fs0 0 2 To edit memory region starting at address 0x00000000 with size of 2 bytes: fs0:\> hexedit -m 0 2

•

•

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if
Controls which script commands will be executed based on provided conditional expressions.

Usage if [not] exist filename then command [arguments] [command [arguments]] … [else command [arguments] [command [arguments]] … ] endif if [/i] [not] string1 == string2 then command [arguments] [command [arguments]] … [else command [arguments] [command [arguments]] … ] endif if [/i][/s] ConditionalExpression then command [arguments] [command [arguments]] … [else command [arguments] [command [arguments]] … ] Endif

Options ConditionalExpression
Conditional expression, as described in “Expressions”, below.

Description
The if command executes one or more commands before the else or endif commands, if the specified condition is true; otherwise commands between else (if present) and endif are executed. In the first usage of if, the exist condition is true when the file specified by filename exists. The filename argument may include device and path information. Also wildcard expansion is supported by this form. If more than one file matches the wildcard pattern, the condition evaluates to TRUE.

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In the second usage, the string1 == string2 condition is true if the two strings are identical. Here the comparison can be case sensitive or insensitive, it depends on the optional switch /i. If /i is specified, it will compare strings in the case insensitive manner; otherwise, it compares strings in the case sensitive manner. In the third usage, general purpose comparison is supported using expressions optionally separated by and or or. Since < and > are used for redirection, the expressions use common two character (FORTRAN) abbreviations for the operators (augmented with unsigned equivalents):

Expressions
Conditional expressions are evaluated strictly from left to right. Complex conditionals requiring precedence may be implemented as nested ifs. The expressions used in the third usage have the following syntax:

conditional-expression := expression | expression and expression expression or expression expression := expr | not expr expr := item binop item | boolfunc(string) item := mapfunc(string) | string mapfunc boolfunc binop := efierror | pierror | oemerror := isint | exists | available | profile := gt | lt | eq | ne | ge | le | == | ugt | ult | uge | ule

Comparisons
By default, comparisons are done numerically if the strings on both sides of the operator are numbers (as defined below) and in case sensitive character sort order otherwise. Spaces separate the operators from operands. The /s option forces string comparisons and the /i option forces case-insensitive string comparisons. If either of these is used, the signed or unsigned versions of the operators have the same results. The /s and /i apply to the entire line and must
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appear at the start of the line (just after the if itself). The two may appear in either order. When performing comparisons, the Unicode Byte Ordering Character is ignored at the beginning of any argument.

Table 19Comparison Operators
Operator Definition Greater than Unsigned Greater than Less than Unsigned Less than Greater than or equal Unsigned greater than or equal Less than or equal Unsigned less than or equal Not equal Equals (semantically equivalent to ==) Equals (semantically equivalent to eq)

gt ugt lt ult ge uge le ule ne eq ==

Error Mapping Functions
These functions are used to convert integers into UEFI, PI or OEM error codes, as defined by Appendix D of the UEFI specification.

Table 20Functions used to convert integers into UEFI, PI or OEM error codes
Function Definition Sets top nibble of parameter to 0100 binary (0x8) Sets top nibble of parameter to 1010 binary (0xA) Sets top nibble of parameter to 1100 binary (0xC)

UefiError PiError OemError

Each function maps the small positive parameter into its equivalent error classification as described in Appendix D of the UEFI Specification. For example, ... if %lasterror% == EfiError(8) then # Check for write protect. ... These functions may only be used to modify operators in comparisons.

Boolean Functions
The following built-in Boolean functions are also available:

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Table 21 Boolean Functions
Function Definition Evaluates to true if the parameter string that follows is a number (as defined below) and false otherwise. Evaluates to true if the file specified by string exists is in the current working directory or false if not. Evaluates to true if the file specified by string is in the current working directory or current path. Determines whether the parameter string matches one of the profile names in the profiles environment variable.

IsInt Exists Available Profile

No spaces are allowed between function names and the open parenthesis, between the open parenthesis and the string or between the string and the closed parenthesis. Constant strings containing spaces must be quoted. Note: To avoid ambiguity and current or future incompatibility, users are strongly encouraged to surround constant strings that contain parenthesis with quotes in if statements.

Conditional Expressions
Not inverts the sense of only the following expression.

Numbers
Allowable number formats are decimal numbers and C-style case insensitive hexadecimal numbers. Numbers may be preceded by a “-“ indicating a negative number. Examples: • • • • • 13 46 -0x3FFF 0x3fff 0x1234

Unsigned values must be less than 264. Signed integer values are bounded by ±263. Numbers are internally represented in two’s compliment form. The representation of the number in the string has no bearing on the way that number is treated in an numeric expression – type is assigned by the operator. So, for example, -1 lt 2 is true but -1 ult 2 is false.

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Examples
# # Example script for “if” command usages 1 and 2 # if exist fs0:\myscript.nsh then myscript myarg1 myarg2 endif if %myvar% == runboth then myscript1 myscript2 else echo ^%myvar^% != runboth endif In this example, if the script file myscript.nsh exists in fs0:\, this script will be launched with 2 arguments, myarg1 and myarg2. After that, environment variable %myvar% is checked to see if its value is runboth, if so, script myscript1 and myscript2 will be executed one after the other, otherwise a message %myvar% != runboth is printed.

# # Example script for “if” command usage 3 # :Redo echo Enter 0-6 or q to quit # assumes “input y” stores a character of user input into variable y InputCh MyVar if x%MyVar% eq x then echo Empty line. Try again goto Redo endif if IsInt(%MyVar%) and %MyVar% le 6 then myscript1 %MyVar% goto Redo endif if /i %MyVar% ne q then echo Invalid input goto Redo endif In this example, the script requests user input and uses the if command for input validation. It checks for empty line first and then range checks the input. Note also the use of the /i in the last comparison so “Q” and “q” are both supported. Note: This command does not change the value of the environment variable lasterror. Note: The if command is only available in scripts. Note: The else command is optional in an if/else statement.

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ifconfig
Summary
Modify the default IP address of the UEFI IP4 Network Stack.

Usage ifConfig [-?] [-c [Name]] [-l [Name]] [-s dhcp | [permanent]]

Options
Name Adapter name, i.e., eth0 -c [Name] Clear the configuration for all or specified interface, and the network stack for related interface will fall back to the DHCP as default. -l [Name] List the configuration for all or the specified interface. -s < Name> static [permanent] Use static IP4 address configuration for all or specified interface. If permanent is not present, the configuration is one-time only, otherwise this configuration request will survive a network stack reload. -s dhcp [permanent] Use DHCP4 to request the IP4 address configuration dynamically for all interface or specified interface. If permanent is not present, the configuration is one-time only, otherwise this configuration request will survive a network stack reload. IP IP4 address in four integer values (each between 0-255). i.e., 192.168.0.10 SubnetMask Subnet mask in four integer values (each between 0-255), i.e., 255.255.255.0 GatewayMask Default gateway in four integer values (each between 0-255), i.e., 192.168.0.1 -? Display the help message

Description
This command is used to modify the default IP address for the UEFI IP4 Network Stack.

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Examples
To list the configuration for the interface eth0: Shell:\> IfConfig -l eth0 To use DHCP4 to request the IP4 address configuration dynamically for the interface eth0: Shell:\> IfConfig –s eth0 dhcp To use the static IP4 address configuration for the interface eth0, and this configuration survives the network reload: Shell:\> IfConfig –s 192.168.0.1 permanent eth0 static 192.168.0.5 255.255.255.0

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ipconfig
Summary
Displays or modifies the current IP configuration.

Usage ipconfig [-r]|[-b] [-c Instance] [IpAddress [-m NetMask]]

Options
-r Restart the PXE base code and DHCP settings -b Display one screen at a time -c, -controller Specify the 0-based handle of the EFI_SIMPLE_NETWORK_PROTOCOL instance to use. IpAddress IP address in a.b.c.d format -m, -mask Network mask in 255.255.255.0 format

Description
This command displays or modifies the IP configuration of EFI_PXE_BASE_CODE_PROTOCOL. If no parameter is specified in the command line, it just displays the IP configuration of EFI_PXE_BASE_CODE_PROTOCOL. If IpAddress or NetMask is specified, the according configuration of EFI_PXE_BASE_CODE_PROTOCOL will be changed.

Examples
• To restart the PXE base code and refresh the DHCP settings: shell:\> IpConfig -r To display the current IP configuration: Shell:\> IpConfig To modify the IP address without changing the network mask: shell:\> IpConfig 192.168.10.30 To modify the IP address and network mask: shell:\> IpConfig 192.168.10.30 -m 255.255.255.0

•

•

•

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load
Summary
Loads a UEFI driver into memory.

Usage load [-nc] file [file...]

Options
-nc Load the driver, but do not connect the driver. File File that contains the image of the UEFI driver (wildcards are permitted)

Description
This command loads an driver into memory. It can load multiple files at one time, and the file name supports wildcards. If the -nc flag is not specified, this command will try to connect the driver to a proper device; it may also cause already loaded drivers be connected to their corresponding devices.

Status Codes Returned
SHELL_SUCCESS SHELL_INVALID_PARAMETER SHELL_SECURITY_VIOLATIO N SHELL_NOT_FOUND
The action was completed as requested. One of the passed in parameters was incorrectly formatted or its value was out of bounds. This function was not performed due to a security violation The requested file was not found

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Examples fs0:\> load Isabus.efi load: Image 'fs0:\Isabus.efi' loaded at 18FE000 - Success fs0:\> load Isabus.efi IsaSerial.efi load: Image 'fs0:\Isabus.efi' loaded at 18E5000 - Success load: Image 'fs0:\IsaSerial.efi' loaded at 18DC000 - Success fs0:\> load Isa*.efi load: Image 'fs0:\IsaBus.efi' loaded at 18D4000 - Success load: Image 'fs0:\IsaSerial.efi' loaded at 18CB000 – Success fs0:\> load –nc IsaBus.efi load: Image ‘fs0:\Isabus.efi’ loaded at 18FE000 - Success

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loadpcirom
Summary
Loads a UEFI driver from a file in the format of a PCI Option ROM.

Usage loadpcirom [-nc] romfile [romfile...]

Options
-nc romfile - Load the ROM image but do not connect the driver - PCI option ROM image file (wildcards are permitted)

Description
This command is used to load PCI option ROM images into memory for execution. The file can contain legacy images and multiple PE32 images, in which case all PE32 images will be loaded. The example below shows typical output from help for this command.

Examples
To load a rom file ‘rom.bin’: fs0:\> LoadPciRom rom.bin To load ‘*.bin’ files but do not connect the driver fs0:\> LoadPciRom –nc *.bin

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ls
Summary
Lists a directory's contents or file information.

Usage ls [-r] [-a[attrib]][-sfo][file]

Options
-r Displays recursively (including subdirectories) -a Display only those files with the attributes which follow. If no attributes are listed, then all files will be listed. If –a is not specified, then all non-system and non-hidden files will be listed. The attributes (attrib) may be one or more of the following: 1. a 2. s 3. h 4. r - Archive - System - Hidden - Read-only - Directory

5. d -sfo

Display information as described in “Standard-Format Output” below. file Name of file/directory (wildcards are permitted)

Description
This command lists directory contents or file information. If no file name or directory name is specified, then the current working directory is assumed. The contents of a directory are listed if all of the following are true: • • • If option -r is not specified If no wildcard characters are specified in the file parameter If file represents an existing directory

In all other cases, the command functions as follows: • • All files/directories that match the specified name are displayed. The -r flag determines whether a recursive search is performed.

• The option flag -a[attrib] tells the command to display only those files with the attributes that are specified by [attrib]. If more than one attribute is
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specified, only the files that have all those attributes will be listed. If -a is followed by nothing, then all files/directories are displayed, regardless of their attributes. If -a itself is not specified, then all files except system and hidden files are displayed.

Status Codes Returned
SHELL_SUCCESS SHELL_INVALID_PARAMETER SHELL_SECURITY_VIOLATION SHELL_NOT_FOUND
The action was completed as requested. One of the passed in parameters was incorrectly formatted or its value was out of bounds. This function was not performed due to a security violation The requested file or directory was not found.

Examples
To hide files by adding the hidden or system attribute to them: fs0:\> attrib +s +h *.efi ASH fs0:\IsaBus.efi ASH fs0:\IsaSerial.efi To display all, except the files/directories with 'h' or 's' attribute: fs0:\> ls Directory of: fs0:\ 06/18/01 06/18/01 06/18/01 06/18/01 06/18/01 06/18/01 01/28/01 09:32p 01:02p 01:02p 01:02p 08:04p 08:05p 08:24p r 3 File(s) 4 Dir(s) 153 512 512 512 29 512 29 211 bytes for.nsh efi test1 test2 temp.txt test readme.txt

To display files with all attributes in the current directory: fs0:\> ls -a Directory of: fs0:\ 06/18/01 06/18/01 06/18/01 06/18/01 06/18/01 06/18/01 06/18/01 06/18/01 01/28/01 09:32p 153 01:02p 512 01:02p 512 01:02p 512 10:59p 28,739 10:59p 32,838 08:04p 29 08:05p 512 08:24p r 29 5 File(s) 61,788 bytes 4 Dir(s) for.nsh efi test1 test2 IsaBus.efi IsaSerial.efi temp.txt test readme.txt

To display files with read-only attributes in the current directory:

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fs0:\> ls -ar Directory of: fs0:\ 06/18/01 11:14p 1 File(s) 0 Dir(s) r 29 29 bytes readme.txt

To display the files with attribute of 's': fs0:\> ls -as isabus.efi Directory of: fs0:\ 06/18/01 10:59p 1 File(s) 0 Dir(s) 28,739 28,739 bytes IsaBus.efi

To display all in fs0:\efi directory recursively: fs0:\> ls -r -a efi To search for files with the specified type in the current directory recursively: fs0:\> ls -r -a *.efi –b

Standard-Format Output
The ls command will produce at least two tables: VolumeInfo and FileInfo. The VolumeInfo table reports one row for each file system volume reported. The FileInfo table reports one row for each file, including directories. The following tables describe the standard table column headings and their description. For more information on “Standard-Format Output”, see Appendix D.

Table 22 ls Standard Formatted Output (VolumeInfo)
Column Number 2 3 4 5 6 Name. Standard volume label Total Size. Total number of bytes in the volume. Read Only. “True” if the volume is read-only, otherwise “False”. Free Space. Total number of free bytes in the volume. Block Size. Nominal block size by which files are typically grown, in bytes. Description

Table 23 ls Standard Formatted Output (FileInfo)
Column Number 2 3 4 Description Name. Complete file name & directory, including the file system’s mapped name. Logical Size. Size of the file, in bytes. Physical Size. Size of the file in the volume, including any padding, in bytes.

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5

Attributes. List of file attributes. The string can contain zero or more of the following (but no repeats): a – Archive d – Directory h – Hidden r – Read-Only s – System

6 7 8 9 10 11

File Creation Time. Time when the file was created, in the format: hh:mm:ss. File Creation Date. Date when the file was created, in the format: dd.mm.yyyy. File Access Time. Time when the file was accessed, in the format: hh:mm:ss File Access Date. Date when the file was accessed, in the format: dd.mm.yyyy File Modification Time. Time when the file was modified, in the format: hh:mm:ss File Modification Date. Date when the file was modified, in the format: dd.mm.yyyy.

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map
Summary
Defines a mapping between a user-defined name and a device handle.

Usage map [-d ] map [[-r][-v][-c][-f][-u][-t ][sname]] map [sname handle | mapping]

Options sname MappingMapped name handle The number of handle, which is same as dumped from 'dh' mapping The device’s mapped name. Use this parameter to assign a new mapping to a device. The mapping must end with a ‘:’. -sfo Output will be formatted according to “Standard-Format Output” below. -t Shows the device mappings, filtered according to the device type. The supported types are fp (floppy), hd (hard disk) and cd (CD-ROM). Types can be combined by putting a comma between two types. Spaces are not allowed between types. -d Deletes a mapping -r Resets to default mappings -v Lists verbose information about all mappings. -c Shows the consistent mapping. -f Shows the normal mapping (not the consistent mapping). -u This option will add mappings for newly installed devices and remove mappings for uninstalled devices but will not change the mappings of existing devices. The user-defined mappings are also preserved.

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Description
This command creates a mapping between a user-defined name and a device. The most common use of this command is to create a the mapped name for devices that support a file system protocol. Once these mappings are created, the names can be used with all the file manipulation commands. The UEFI Shell environment creates default mappings for all of the devices that support a recognized file system. This command can be used to create additional mappings, or it can be used to delete an existing mapping with the -d option. If the map command is used without any parameters, all of the current mappings will be listed. If the -v option is used, the mappings will be shown with additional information about each device. The -r option is used to reset all the default mappings in a system; this option is useful if the system configuration has changed since the last boot. The –u option will add mappings for newly installed devices and remove mappings for uninstalled devices but will not change the mappings of existing devices. The userdefined mappings are also preserved. A mapping history will be saved so that the original mapping name is used for a device with a specific device path if that mapping name was used for that device path last time. The current directory is also preserved if the current device is not changed. Each device in the system has a consistent mapping. If the hardware configuration has not changed, the device’s consistent mappings do not change. If two or more machines have the same hardware configurations, the device’s consistent mapping will be the same. Use the -c option to list all the consistent mappings in the system. The mapping consist of digits and characters. Other characters are illegal. This command support wildcards. You can use the wildcards to delete or show the mapping . However, when you assign the mapping, wildcards are forbidden.

Status Codes Returned
SHELL_SUCCESS SHELL_SECURITY_VIOLATION SHELL_INVALID_PARAMETER
The action was completed as requested. This function was not performed due to a security violation One of the passed in parameters was incorrectly formatted or its value was out of bounds.

Standard-Format Output
If –sfo is specified, then the map command will output a single table: Mappings. The following table describes the table columns for this table:

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Table 24 Standard Formatted Output (Mappings)
Column Number 2 3 4 Description Mapped Name. The mapped device name. Device Path. The device path which corresponds to the mapped device name. Consistent Name. The consistent mapped name (if any) which is equivalent to

MappedName. If MappedName is already a consistent mapped name, then this column is empty.

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md
Summary
An internal alias for the mkdir command. '

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mem
Summary
This is a built-in alias for dmem.

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memmap
Summary
Displays the memory map maintained by the EFI environment.

Usage memmap [-b]

Options
-b Display one screen at a time

Description
This command displays the memory map that is maintained by the EFI environment. The EFI environment keeps track all the physical memory in the system and how it is currently being used. The EFI Specification defines a set of Memory Type Descriptors. Please see the EFI Specification for a description of how each of these memory types is used. The following example shows typical output for help on this command.

Examples
To display the system memory map:

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fs0:\> memmap Type Start End # Pages Attributes available 0000000000750000-0000000001841FFF 00000000000010F2 0000000000000009 LoaderCode 0000000001842000-00000000018A3FFF 0000000000000062 0000000000000009 available 00000000018A4000-00000000018C1FFF 000000000000001E 0000000000000009 LoaderData 00000000018C2000-00000000018CAFFF 0000000000000009 0000000000000009 BS_code 00000000018CB000-0000000001905FFF 000000000000003B 0000000000000009 BS_data 0000000001906000-00000000019C9FFF 00000000000000C4 0000000000000009 ... RT_data 0000000001B2B000-0000000001B2BFFF 0000000000000001 8000000000000009 BS_data 0000000001B2C000-0000000001B4FFFF 0000000000000024 0000000000000009 reserved 0000000001B50000-0000000001D4FFFF 0000000000000200 0000000000000009 reserved : 512 Pages (2,097,152) LoaderCode: 98 Pages (401,408) LoaderData: 32 Pages (131,072) BS_code : 335 Pages (1,372,160) BS_data : 267 Pages (1,093,632) RT_data : 19 Pages (77,824) available : 4,369 Pages (17,895,424) Total Memory: 20 MB (20,971,520) Bytes

Standard-Format Output
The standard-format output produced with the –sfo option produces two tables: MemoryMap and Summary.

Table 25 Standard-Format Output for memmap (MemoryMap)
Column Number 2 Type. Description

Available LoaderCode LoaderData BootServiceCode BootServiceData RuntimeCode RuntimeData Reserved
3 4 Starting Address Ending Address

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5 6

Number Of 4KB Pages Attributes

Table 26 Standard-Format Output for memmap (Summary)
Column Number 2 3 4 5 6 7 8 9 10 Total Memory Size (bytes) Reserved Memory Total Size (bytes) Boot Service Code Total Size (bytes) Boot Service Data Total Size (bytes) Runtime Code Total Size (bytes) Runtime Data Total Size (bytes) Loader Code Total Size (bytes) Loader Data Total Size (bytes) Available Total Size (bytes) Description

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mkdir
Summary
Creates one or more new directories.

Usage mkdir dir [dir...]

Options dir Name of directory or directories to be created. Wildcards are not allowed.

Description
This command creates one or more new directories. If dir includes nested directories, then parent directories will be created before child directories. If the directory already exists, then the command will exit with an error.

Status Codes Returned
SHELL_SUCCESS SHELL_INVALID_PARAMETER SHELL_OUT_OF_RESOURCES SHELL_SECURITY_VIOLATION SHELL_WRITE_PROTECTED
The action was completed as requested. One of the passed in parameters was incorrectly formatted or its value was out of bounds. There was insufficient space on the destination to create the requested directory. This function was not performed due to a security violation An attempt was made to create a directory when the target media was write-protected.

Examples
To create a new directory: fs0:\> mkdir rafter fs0:\> ls Directory of: fs0:\ 06/18/01 06/18/01 06/18/01 08:05p 11:14p r 11:50p 1 File(s) 2 Dir(s) 512 29 512 211 bytes test readme.txt rafter

•

To create multiple directories:

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fs0:\> mkdir temp1 temp2 fs0:\> ls Directory of: fs0:\ 06/18/01 06/18/01 06/18/01 06/18/01 06/18/01 08:05p 11:14p r 11:50p 11:52p 11:52p 1 File(s) 4 Dir(s) 512 29 512 512 512 211 bytes test readme.txt rafter temp1 temp2

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mm
Summary
Displays or modifies MEM/MMIO/IO/PCI/PCIE address space.

Usage mm address [value] [-w 1|2|4|8] [-MEM | -MMIO | -IO | -PCI | -PCIE] [-n]

Options address Starting address value The value to write. If not specified, then the current value will be displayed. -MEM Memory Address type. -IO IO Address type -PCI PCI Configuration Space. The address will have the format 0x000000ssbbddffrr, where ss = Segment, bb = Bus, dd = Device, ff = Function and rr = Register. This is the same format used in the PCI command. -PCIE PCI Express Configuration Space. The address will have the format 0x0000000ssbbddffrrr, where ss = Segment, bb = Bus, dd = Device, ff = Function and rrr = Register. -w Access Width, in bytes. 1 = byte, 2 = 2 bytes, 4 = 4 bytes, 8 = 8 bytes. If not specified, then 1 is assumed. -n Non-interactive mode.

Description
This command allows the user to display or modify I/O register, memory contents, or PCI configuration space. The user can specify the start address and the access size they wish to perform using the Address parameter and –w option. Address should be typed in hex value. -MEM accesses system memory, -MMIO accesses device memory, IO accesses device I/O ports, -PCI accesses PCI Configuration Space, and –PCIE accesses PCIE Configuration Space. If –MEM, -MMIO, -IO, -PCI and –PCIE are not specified, then –MEM is assumed.
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If Value is specified which should be typed in hex value, this command will write this value to specified address. Otherwise when this command is executed, the current contents of Address are displayed. If Value is specified, then –n is assumed. If -n is not specified, the command will run in interactive mode and the user has the option of modifying the contents by typing in a hex value. When the user pressed ‘ENTER’, then next address is displayed. This is continued until the user enters ‘q’.

Examples
To display or modify memory: Address 0x1b07288, default width=1 byte: fs0:\> mm 1b07288 MEM 0x0000000001B07288 : 0x6D > MEM 0x0000000001B07289 : 0x6D > MEM 0x0000000001B0728A : 0x61 > 80 MEM 0x0000000001B0728B : 0x70 > q fs0:\> mm 1b07288 MEM 0x0000000001B07288 MEM 0x0000000001B07289 MEM 0x0000000001B0728A MEM 0x0000000001B0728B : : : : 0x6D 0x6D 0x80 0x70 > > > > q

*Modified

To modify memory: Address 0x1b07288, width = 2 bytes: Shell> mm 1b07288 -w 2 MEM 0x0000000001B07288 : 0x6D6D > MEM 0x0000000001B0728A : 0x7061 > 55aa MEM 0x0000000001B0728C : 0x358C > q Shell> mm 1b07288 -w 2 MEM 0x0000000001B07288 : 0x6D6D > MEM 0x0000000001B0728A : 0x55AA > MEM 0x0000000001B0728C : 0x358C > q

*Modified

To display IO space: Address 80h, width = 4 bytes: Shell> mm 80 -w 4 -IO IO 0x0000000000000080 : 0x000000FE > IO 0x0000000000000084 : 0x00FF5E6D > q To modify IO space using non-interactive mode: Shell> mm 80 52 -w 1 -IO Shell> mm 80 -w 1 -IO IO 0x0000000000000080 : 0x52 > FE *Modified IO 0x0000000000000081 : 0xFF > IO 0x0000000000000082 : 0x00 > IO 0x0000000000000083 : 0x00 > IO 0x0000000000000084 : 0x6D > IO 0x0000000000000085 : 0x5E > IO 0x0000000000000086 : 0xFF > IO 0x0000000000000087 : 0x00 > q • To display PCI configuration space, ss=00, bb=00, dd=00, ff=00, rr=00:

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Shell> mm 0000000000 -PCI PCI 0x0000000000000000 : PCI 0x0000000000000001 : PCI 0x0000000000000002 : PCI 0x0000000000000003 : PCI 0x0000000000000004 : PCI 0x0000000000000005 :

0x86 0x80 0x30 0x11 0x06 0x00

> > > > > > q

These contents can also be displayed by 'PCI 00 00 00'. To display PCIE configuration space, ss=00, bb=06, dd=00, ff=00, rrr=000: Shell> mm 00060000000 -PCIE PCIE 0x0000000060000000 : 0xAB > PCIE 0x0000000060000001 : 0x11 > PCIE 0x0000000060000002 : 0x61 > PCIE 0x0000000060000003 : 0x43 > PCIE 0x0000000060000004 : 0x00 > q

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mode
Summary
Displays or changes the console output device mode.

Usage mode [col row]

Options row Number of rows col Number of columns

Description
This command is used to change the display mode for the console output device. When this command is used without any parameters, it shows the list of modes that the standard output device currently supports. The mode command can then be used with the row and col parameter to change the number of rows and columns on the standard output device. The following examples show how the mode command can be used. The first example lists all modes that are currently available, and the current selected mode is indicated by an '*'. The second example changes the mode to an 80 X 50 text mode display. The display is cleared every time the mode command is used to change the currently selected display mode.

Status Codes Returned
SHELL_SUCCESS SHELL_SECURITY_VIOLATION SHELL_INVALID_PARAMETER
The action was completed as requested. This function was not performed due to a security violation One of the passed in parameters was incorrectly formatted or its value was out of bounds.

Examples
To display all available modes on standard output: Shell> mode Available modes on standard output col 80 row 25 * col 80 row 50 col 80 row 43 col 100 row 100 To change the current mode setting:

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Shell> mode 80 50 Available modes on standard output col 80 row 25 col 80 row 50 * col 80 row 43 col 100 row 100

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mv
Summary
Moves one or more files to a destination within a file system.

Usage mv src [src...] [dst]

Options src Source file/directory name (wildcards are permitted) dst Destination file/directory name (wildcards are permitted). If not specified, then the current working directory is assumed to be the destination. If there is more than one argument on the command line, the last one will always be considered the destination.

Description
This command moves one or more files to a destination within a file system. Moving between filesystem volumes is not supported. If the destination is an existing directory, then the sources are moved into that directory. Otherwise, the sources are moved to the destination, as if the directory has been renamed. If a destination is not specified, the current directory is assumed to be the destination. Attempting to move a read-only file/directory will result in an error. Moving a directory that contains read-only files is allowed. You cannot move a directory into itself or its subdirectories. You cannot move a directory if the current working directory is itself or its subdirectories. If an error occurs, the remaining files or directories will still be moved.

Status Codes Returned
SHELL_SUCCESS SHELL_INVALID_PARAMETER SHELL_NOT_FOUND SHELL_OUT_OF_RESOURCES SHELL_SECURITY_VIOLATION SHELL_WRITE_PROTECTED
The action was completed as requested. One of the passed in parameters was incorrectly formatted or its value was out of bounds. The source file was not able to be found There was insufficient free space to move the requested file to its destination. This function was not performed due to a security violation An attempt was made to create a file on media that was writeprotected.

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Examples
To rename a file: fs0:\> mv IsaBus.efi Bus.efi moving fs0:\IsaBus.efi -> \Bus.efi - [ok]

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openinfo
Summary
Displays the protocols and agents associated with a handle.

Usage openinfo Handle [-b]

Options
Handle Display open protocol information for specified handle -b Display one screen at a time

Description
This command is used to display the open protocols on a given handle. The example below is typical output from help for this command.

Table 27 Open Protocol Information Layout
Column Index 1 2 3 4 5 Description Agent handle that opens the protocol Controller handle that requires the protocol interface Open count Open type: HandProt, GetProt, TestProt, Child, Driver, Exclusive, DriverEx or Unknown Name of image of the agent if available

Examples
To show open protocols on handle 0x23: Shell> openinfo 23 Handle 23 (07DEE108) PciRootBridgeIo Drv[1D] Ctrl[23] Cnt(01) Driver Drv[1D] Ctrl[28] Cnt(01) Child Drv[1D] Ctrl[29] Cnt(01) Child Drv[1D] Ctrl[2A] Cnt(01) Child Drv[1D] Ctrl[2B] Cnt(01) Child Drv[1D] Ctrl[2C] Cnt(01) Child Drv[1D] Ctrl[2D] Cnt(01) Child Drv[1D] Ctrl[2E] Cnt(01) Child Drv[00] Ctrl[ ] Cnt(01) HandProt dpath Drv[1D] Ctrl[23] Cnt(01) Driver Drv[00] Ctrl[ ] Cnt(0D) HandProt

Image(PciBus) Image(PciBus) Image(PciBus) Image(PciBus) Image(PciBus) Image(PciBus) Image(PciBus) Image(PciBus) Image(PciBus)

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parse
Summary
Command used to retrieve a value from a particular record which was output in a standard formatted output.

Usage parse filename tablename column [-i ] [-s ]

Options filename Source file name tablename The name of the table being parsed. column The one-based column index to use to determine which value from a particular record to parse. -i Start parsing with the nth instance of specified tablename, after the specified instance of ShellCommand. If not present, then all instances will be returned. -s Start parsing with the nth instance of the ShellCommand table. If not present, then 1 is assumed.

Description
This command will enable the parsing of data from a file which contains data which has been output from a command having used the –sfo parameter. Since the standard formatted output has a well known means of parsing, this command is intended to be used as a simplified means of having scripts consume such constructed output files and use this retrieved data in logic of the scripts being written for the UEFI shell.

Examples
The following data is contained in a temporary file (temp.txt): VolumeInfo, "MikesVolume","400000000","32000000","16000000" FileInfo, "fs0:/efi/boot/winloader.efi","45670","arsh" FileInfo, "fs0:/efi/boot/mikesfile.txt","1250","a" FileInfo, "fs0:/efi/boot/readme.txt","795","a" The following shows the parse command being used:

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fs0:\> parse temp.txt VolumeInfo 2 MikesVolume Below is an example using the Index parameter: fs0:\> parse temp.txt FileInfo 3 –i 3 795

Status Codes Returned
SHELL_SUCCESS SHELL_INVALID_PARAMETER SHELL_NOT_FOUND SHELL_SECURITY_VIOLATION
The action was completed as requested. One of the passed in parameters was incorrectly formatted or its value was out of bounds. The source file was not able to be found This function was not performed due to a security violation

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pause
Usage
pause [-q]

Description
The pause command prints a message to the display and then suspends script file execution and waits for keyboard input. Pressing any key resumes execution, except for q or Q. If q or Q is pressed, script processing terminates; otherwise execution continues with the next line after the pause command. The pause command is available only in scripts. Switch –q can hide the message and it’s optional.

Examples
Following script is a sample of 'pause' command: fs0:\> type pause.nsh # # Example script for 'pause' command # echo pause.nsh begin.. date time pause echo pause.nsh done. To execute the script with echo on: fs0:\> pause.nsh +pause.nsh> echo pause.nsh begin.. pause.nsh begin.. +pause.nsh> date 06/19/2001 +pause.nsh> time 00:51:45 +pause.nsh> pause Enter 'q' to quit, any other key to continue: +pause.nsh> echo pause.nsh done. pause.nsh done. To execute the script with echo off: fs0:\> echo -off fs0:\> pause.nsh pause.nsh begin.. 06/19/2001 00:52:50 Enter 'q' to quit, any other key to continue: q fs0:\>

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pci
Summary
Displays PCI device list or PCI function configuration space.

Usage pci [Bus Dev [Func] [-s Seg] [-i]]

Options
Bus Bus number Dev Device number Func Function number -s Optional segment number Seg specified -i Information interpreted

Description
This command will display all the PCI devices found in the system. And it can also display the configuration space of a PCI device according to the specified bus (Bus), device (Dev),and function (Func) addresses. If the function address is not specified, it will default to 0. The –i option is used to display verbose information for the specified PCI device. The PCI configuration space for the device will be dumped with a detailed interpretation. If no parameters are specified all PCI devices will be listed. If the Bus and Device number parameters are specified while the Func or Seg parameters are not, Function or Seg will be set as default value 0. The '-i' option can be used to display verbose information for the specified PCI device. The PCI configuration space for the specified device will be dumped wit h a detailed interpretation.

Examples
To display all PCI devices in the system:

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Shell> PCI Seg --00 00 00 00 00 00 00 00 00 00 00 00 00 00 Bus --00 00 00 00 00 00 00 00 00 00 01 02 02 02 Dev Func --- ---00 00 ==> Bridge Device - Host/PCI bridge Vendor 8086 Device 1130 Prog Interface 0 01 00 ==> Bridge Device - PCI/PCI bridge Vendor 8086 Device 1131 Prog Interface 0 1E 00 ==> Bridge Device - PCI/PCI bridge Vendor 8086 Device 244E Prog Interface 0 1F 00 ==> Bridge Device - PCI/ISA bridge Vendor 8086 Device 2440 Prog Interface 0 1F 01 ==> Mass Storage Controller - IDE controller Vendor 8086 Device 244B Prog Interface 80 1F 02 ==> Serial Bus Controllers - USB Vendor 8086 Device 2442 Prog Interface 0 1F 03 ==> Serial Bus Controllers - System Management Bus Vendor 8086 Device 2443 Prog Interface 0 1F 04 ==> Serial Bus Controllers - USB Vendor 8086 Device 2444 Prog Interface 0 1F 05 ==> Multimedia Device - Audio device Vendor 8086 Device 2445 Prog Interface 0 1F 06 ==> Simple Communications Controllers - Modem Vendor 8086 Device 2446 Prog Interface 0 00 00 ==> Display Controller - VGA/8514 controller Vendor 1002 Device 5246 Prog Interface 0 07 00 ==> Multimedia Device - Audio device Vendor 1274 Device 1371 Prog Interface 0 0A 00 ==> Bridge Device - CardBus bridge Vendor 1180 Device 0476 Prog Interface 0 0A 01 ==> Bridge Device - CardBus bridge Vendor 1180 Device 0476 Prog Interface 0

To display the configuration space of Bus 0, Device 0, Function 0:

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Shell> PCI 00 00 00 -i PCI Segment 00 Bus 00000000: 86 80 30 ........* 00000010: 08 00 00 ............* 00000020: 00 00 00 *................* 00000030: 00 00 00 *................* 00000040: 00 00 00 *................* 00000050: 50 00 09 *P..8............* 00000060: 00 00 00 *................* 00000070: 00 00 18 *................* 00000080: DE 2C CF *.,..............* 00000090: 00 00 D6 *........3.3.....* 000000A0: 02 00 20 .............* 000000B0: 00 00 00 *....0...........* 000000C0: 00 00 00 *................* 000000D0: 00 00 00 *................* 000000E0: 00 00 00 *................* 000000F0: 00 00 00 *....t...........* Vendor ID(0): 8086 Command(4): 0006 (00)I/O space access enabled: 1 (02)Behave as bus master: enabled: 0 (04)Mem Write & Invalidate enabled: 0 (06)Assert PERR# when parity error: 0 (08)SERR# driver enabled: transact...: 0 0 1 0 0 0 00 Device 00 Func 00 11 06 00 90 20-02 00 00 06 00 00 00 00 20 00 00 00 00-00 00 00 00 00 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 00 88 00 00 00-00 00 00 00 00 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 38 00 00 00 00-00 00 00 00 00 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 00 00 00 00 00-09 A0 04 F1 00 00 00 00 FF FE FF 00 00-33 80 33 80 85 84 C4 00 00 07 02 00 1F-00 00 00 00 00 00 00 00 00 30 00 00 00-00 00 00 00 00 00 08 00 00 00 00 00 00-00 08 00 00 00 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 00 00 00 00 00-00 00 90 14 00 00 00 00 00 74 F8 00 00-00 00 00 00 08 00 00 00 Device ID(2): 1130 (01)Memory space access enabled: (03)Monitor special cycle (05)Palette snooping is enabled: (07)Do address/data stepping: (09)Fast back-to-back *.. *..0.... *...

Status(6): 2090 (04)New Capabilities linked list: 1 0 (07)Fast Back-to-Back Capable: 1 0 (09)DEVSEL timing: Fast 0 (12)Received Target Abort: 0 1 (14)Signaled System Error: 0 0

(05)66MHz Capable: (08)Master Data Parity Error: (11)Signaled Target Abort: (13)Received Master Abort: (15)Detected Parity Error:

Revision ID(8): 02 BIST(0F): Incapable Cache Line Size(C): 00 Latency Timer(D): 00 Header Type(0E): 0, Single function, PCI device Class: Bridge Device - Host/PCI bridge Base Address Registers(10):
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Start Type Space Prefetchable? Size Limit ---------------------------------------------------------------20000000 Mem 32 bits YES 04000000 24000000 ---------------------------------------------------------------No Expansion ROM(30) Cardbus CIS ptr(28): Sub VendorID(2C): Capabilities Ptr(34): Interrupt Line(3C): Min_Gnt(3E): 00000000 0000 88 00 00 Subsystem ID(2E): Interrupt Pin(3D): Max_Lat(3F): 0000 00 00

To display configuration space of Segment 0, Bus 0, Device 0, Function 0: Shell> PCI 00 00 00 -s 0 PCI Segment 00 Bus 00000000: 86 80 30 ........* 00000010: 08 00 00 ............* 00000020: 00 00 00 *................* 00000030: 00 00 00 *................* 00000040: 00 00 00 *................* 00000050: 50 00 09 *P..8............* 00000060: 00 00 00 *................* 00000070: 00 00 18 *................* 00000080: DE A8 CE *................* 00000090: 00 00 D6 *........3.3.....* 000000A0: 02 00 20 .............* 000000B0: 00 00 00 *....0...........* 000000C0: 00 00 00 *................* 000000D0: 00 00 00 *................* 000000E0: 00 00 00 *................* 000000F0: 00 00 00 *....t...........* 00 Device 00 Func 00 11 06 00 90 20-02 00 00 06 00 00 00 00 20 00 00 00 00-00 00 00 00 00 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 00 88 00 00 00-00 00 00 00 00 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 38 00 00 00 00-00 00 00 00 00 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 00 00 00 00 00-09 A0 04 F1 00 00 00 00 FF FE FF 00 00-33 80 33 80 85 84 C4 00 00 07 02 00 1F-00 00 00 00 00 00 00 00 00 30 00 00 00-00 00 00 00 00 00 08 00 00 00 00 00 00-00 08 00 00 00 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 00 00 00 00 00-00 00 A0 18 00 00 00 00 00 74 F8 00 00-00 00 00 00 08 00 00 00 *.. *..0.... *...

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ping
Summary
Ping the target host with IPv4 stack.

Usage
Ping [-n count] [-l size] TargetIp

Options
-n Number of echo request datagram to be sent. -l Size of data buffer in echo request datagram. TargetIp IPv4 address of the target machine.

Description
This command uses the ICMPv4 ECHO_REQUEST datagram to elicit ECHO_REPLY from a host.

Examples
To ping the target host with 64 bytes data: Shell:\> ping -l 64 192.168.0.1

To ping the target host by sending 20 echo request datagram: Shell:\> ping -n 20 202.120.100.1

Status Codes Returned
SHELL_SUCCESS SHELL_INVALID_PARAMETER
The action was completed as requested. One of the passed in parameters was incorrectly formatted or its value was out of bounds.

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reconnect
Summary
Reconnects drivers to the specific device.

Usage reconnect DeviceHandle [DriverHandle [ChildHandle]] reconnect -r

Options
DeviceHandle Device handle (a hexadecimal number) DriverHandle Driver handle (a hexadecimal number). If not specified, all drivers on the specified device will be reconnected. ChildHandle Child handle of device (a hexadecimal number). If not specified, then all child handles of the specified device will be reconnected. -r Reconnect drivers to all devices.

Description
This command reconnects drivers to the specific device. It will first disconnect the specified driver from the specified device and then connect the driver to the device recursively. If the -r option is used, then all drivers will be reconnected to all devices. Any drivers that are bound to any devices will be disconnected first and then connected recursively. See the connect and disconnect commands for more details.

Status Codes Returned
SHELL_SUCCESS SHELL_SECURITY_VIOLATION SHELL_INVALID_PARAMETER
The action was completed as requested. This function was not performed due to a security violation One of the passed in parameters was incorrectly formatted or its value was out of bounds.

Examples
To reconnect all drivers to all devices:

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Shell> reconnect -r To reconnect all drivers to device 0x28: fs0:\> reconnect 28 To disconnect 0x17 from 0x28 then reconnect drivers with 0x17 as highest priority to device 0x28: fs0:\> reconnect 28 17 To disconnect 0x17 from 0x28 destroying child 0x32 then reconnect drivers with 0x17 as highest priority to device 0x28 fs0:\> reconnect 28 17 32

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reset
Summary
Resets the system.

Usage reset [-w [string]] reset [-s [string]] reset [-c [string]]

Options
-s -w -c string Performs a shutdown Performs a warm boot Performs a cold boot String to be passed to reset service

Description
This command resets the system. The default is to perform a cold reset unless the -w parameter is specified. If the reset string is specified, then it is passed into the Reset() function, so the system can know the reason for the system reset.

Status Codes Returned
SHELL_INVALID_PARAMETER
One of the passed in parameters was incorrectly formatted or its value was out of bounds.

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rm
Summary
Deletes one or more files or directories.

Usage rm [-q] file/directory [file/directory ...]

Options
-q Quiet mode; does not prompt user for a confirmation file File name (wildcards are permitted) directory Directory name (wildcards are permitted)

Description
This command deletes one or more files or directories. If the target is a directory, it will delete the directory, including all its subdirectories. It is not allowed to redirect a file whose parent directory (or the file itself) is being deleted. Removing a read-only file/directory will result in a failure. Removing a directory containing read-only file(s) will result in a failure. If an error occurs, rm will exit immediately and later files/directories will not be removed. You cannot remove a directory when the current directory is itself or its subdirectory. If file contains wildcards, it will not ask user for confirmation. You cannot remove the root directory. You cannot remove the current directory or its ancestor.

Status Codes Returned
SHELL_SUCCESS SHELL_NOT_FOUND SHELL_SECURITY_VIOLATION SHELL_WRITE_PROTECTED
The action was completed as requested. The target file or directory was not able to be found This function was not performed due to a security violation The target media was write-protected.

Examples
To remove multiple directories at a time:

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fs0:\> ls test Directory of: fs0:\test 06/18/01 06/18/01 06/19/01 06/19/01 01:01p 01:01p 12:59a 12:59a 0 File(s) 4 Dir(s) 512 0 512 512 0 bytes . .. temp1 temp2

Error occurs and RM will exit: fs0:\> rm test\temp11 temp2 rm/del: Cannot find 'fs0:\test\temp11' - Not Found To remove multiple directories with wildcards: fs0:\> rm test\temp* rm/del: Remove subtree 'fs0:\test\temp1' [y/n]? y removing fs0:\test\temp1\temp1.txt - [ok] removing fs0:\test\temp1\boot\nshell.efi - [ok] removing fs0:\test\temp1\boot - [ok] removing fs0:\test\temp1 - [ok] rm/del: Remove subtree 'fs0:\test\temp2' [y/n]? y removing fs0:\test\temp2\temp2.txt - [ok] removing fs0:\test\temp2 - [ok] Removing a directory that contains a read-only file will fail: fs0:\> attrib +r test\temp1\readme.txt A R fs0:\test\temp1\readme.txt fs0:\> rm test\temp1 rm/del: Cannot open 'readme.txt' under 'fs0:\test\temp1' in writable mode - [error] - Access Denied Exit status code: Access Denied

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sermode
Summary
Sets serial port attributes.

Usage sermode [handle [baudrate parity databits stopbits]]

Options handle Device handle for a serial port in hexadecimal. The dh command can be used to retrieve the right handle. baudrate Baud rate for specified serial port. The following values are supported: 50, 75, 110, 150, 300, 600, 1200, 1800, 2000, 2400, 3600, 4800, 7200, 9600(default), 19200, 38400, 57600, 115200, 230400, and 460800. All other values will be converted to the next highest setting. parity Parity bit settings for specified serial port. Any one of the following: d n e o m s - Default parity - No parity - Even parity - Odd parity - Mark parity - Space parity

databits Data bits for the specified serial port. The following settings are supported: 4, 7, 8 (default). All other settings are invalid. stopbits Stop bits for the specified serial port. The following settings are supported: 0 (0 stop bits - default setting) 1 (1 stop bit) 2 (2 stop bits) 15 (1.5 stop bits) Note: All other settings are invalid.

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Description
This command displays or sets baud rate, parity attribute, data bits and stop bits of serial ports. If no attributes are specified, then the current settings are displayed. If no handle is specified, then all serial ports are displayed.

Examples
To display the settings for all serial port devices: Shell> sermode 4F06B08 - (115200, N, 8, 1) 4F05F88 - (115200, N, 8, 1) To display the settings for the serial port device whose handle is 0x6B: Shell> sermode 6B 4F06B08 - (115200, N, 8, 1) To configure the serial port settings for handle 0x6B to 9600bps, even parity, 8 data bits, and 1 stop bit: Shell> sermode 6B 9600 e 8 1 sermode: Mode set on handle 04F06B08

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set
Summary
Displays, changes or deletes a UEFI Shell environment variables.

Usage set [-v] [sname [value]] set [-d ]

Options
-d Deletes the environment variable -v Volatile variable sname Environment variable name value Environment variable value

Description
This command is used to maintain the UEFI Shell environment variables. This command can do the following: • • • • Display the environment variables. Create new environment variables. Change the value of existing environment variables. Delete environment variables.

The set command will set the environment variable that is specified by sname to value. This command can be used to create a new environment variable or to modify an existing environment variable. If the set command is used without any parameters, then all the environment variables are displayed. If the set command is used with the -d option, then the environment variable that is specified by sname will be deleted. Note: This command does not change the value of the environment variable lasterror.

Status Codes Returned
SHELL_SUCCESS SHELL_SECURITY_VIOLATION The action was completed as requested. This function was not performed due to a security violation

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SHELL_OUT_OF_RESOURCES

A request to set a variable in a non-volatile fashion could not be completed. The resulting non-volatile request has been converted into a volatile request.

Examples
To add an environment variable: Shell> set DiagnosticPath fs0:\efi\diag;fs1:\efi\diag To display environment variables: Shell> set * path : . diagnosticPath : fs0:\efi1.1\diag;fs1:\efi1.1\diag To delete an environment variable: Shell> set -d diagnosticpath Shell> set * path : . To change an environment variable: fs0:\> set src efi fs0:\> set * path : .;fs0:\efi\tools;fs0:\efi\boot;fs0:\ src : efi fs0:\> set src efi1.1 fs0:\> set * path : .;fs0:\efi\tools;fs0:\efi\boot;fs0:\ src : efi1.1 To append an environment variable: Shell> set * path : . Shell> set path %path%;fs0:\efi\tools;fs0:\efi\boot;fs0:\ Shell> set * path : .;fs0:\efi\tools;fs0:\efi\boot;fs0:\ To set a volatile variable that will disappear at the next boot: Shell> set -v EFI_SOURCE c:\project\EFI1.1 Shell> set * path : .;fs0:\efi\tools;fs0:\efi\boot;fs0:\ * EFI_SOURCE : c:\project\EFI1.1

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setsize
Summary
Adjusts the size of a file.

Usage setsize size file [file...]

Options file The file or files which will have its size adjusted. size The desired size of the file once it is adjusted. Setting the size smaller than the actual data contained in this file will truncate this data.

Description
This command adjusts the size of a particular target file. When adjusting the size of a file, it should be noted that it will automatically truncate or extend the size of a file based on the passed in parameters. If the file does not exist, it will be created.

Status Codes Returned
SHELL_SUCCESS SHELL_VOLUME_FULL SHELL_INVALID_PARAMETER
The action was completed as requested. The media has insufficient space to complete the request. One of the passed in parameters was incorrectly formatted or its value was out of bounds.

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setvar
Summary
Changes the value of a UEFI variable.

Usage setvar variable-name [–guid guid][-bs][-rs][-nv] [=data]

Options variable-name The name of the UEFI variable to modify or display. -guid Specifies the GUID of the UEFI variable to modify or display. If not present, then the GUID EFI_GLOBAL_VARIABLE, as defined in chapter 3.2 of the UEFI specification. -bs Indicates that the variable is a boot variable. Should only be present for new variables, otherwise it is ignored. -rt Indicates that the variable is a runtime variable. Should only be present for new variables, otherwise it is ignored. -nv Indicates that the variable is non-volatile. If not present, then the variable is assumed to be volatile. Should only be present for new variables, otherwise it is ignored. =data New data for the variable. If there is nothing after the ‘=’ then the variable is deleted. If = is not present, then the current value of the variable is dumped as hex bytes. The data may consist of zero or more of the following:

xx[xx]:
Hexadecimal bytes

“ascii-string”:
ASCII-string with no null-terminator

L”UCS2-string”:
UCS-2 encoded string with no null-terminator

--device
Device path text format, as specified by the EFI Device Path Display Format Overview section of the UEFI 2.1 specification.

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Description
This command changes the UEFI variable specified by name and guid. If = is specified, but data is not, the variable is deleted, if it exists. If = is not specified, then the current variable contents are displayed. If =data is specified, then the variable’s value is changed to the value specified by data. -bs, -rt and –nv are only useful if the variable already exists. If the variable already exists and the attributes cannot be changed, then -1 is returned.

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shift
Usage
shift

Description
The shift command shifts the contents of a UEFI Shell script’s positional parameters so that %1 is discarded, %2 is copied to %1, %3 is copied to %2, %4 is copied to %3 and so on. This allows UEFI Shell scripts to process script parameters from left to right. Note: This command does not change the UEFI shell environment variable lasterror. Note: The shift command is available only in UEFI Shell scripts.

Examples
Following script is a sample of 'shift' command: fs0:\> type shift.nsh # # Example script for 'shift' command # echo %1 %2 %3 shift echo %1 %2 To execute the script with echo on: fs0:\> shift.nsh welcome EFI world shift.nsh> echo welcome EFI world welcome EFI world shift echo EFI world EFI world To execute the script with echo off: fs0:\> echo -off fs0:\> shift.nsh welcome EFI world welcome EFI world EFI world

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smbiosview
Summary
Displays SMBIOS information.

Usage smbiosview [-t SmbiosType]|[-h SmbiosHandle]|[-s]|[-a]

Options
-t Display all structures of SmbiosType. The following values are supported: 0 - BIOS Information 1 - System Information 3 - System Enclosure 4 - Processor Information 5 - Memory Controller Information 6 - Memory Module Information 7 - Cache Information 8 - Port Connector Information 9 - System Slots 10 - On Board Devices Information 15 - System Event Log 16 - Physical Memory Array 17 - Memory Device 18 - 32-bit Memory Error Information 19 - Memory Array Mapped Address 20 - Memory Device Mapped Address 21 - Built-in Pointing Device 22 - Portable Battery 34 - Management Device 37 - Memory Channel 38 - IPMI Device Information 39 - System Power Supply -h Display the structure of SmbiosHandle, the unique 16-bit value assigned to each SMBIOS structure. SmbiosHandle can be specified in either decimal or hexadecimal format. Use the 0x prefix for hexadecimal values. -s Display statistics table. -a Display all information.

Description
This command displays the SMBIOS information. Users can display the information of SMBIOS structures specified by type or handle.
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Version 2.0 195

stall
Summary
Stalls the operation for a specified number of microseconds.

Usage stall time

Options time The number of microseconds for the processor to stall.

Description
This command would be used to establish a timed stall of operations during a script.

Status Codes Returned
SHELL_SUCCESS SHELL_DEVICE_ERROR SHELL_INVALID_PARAMETER
The action was completed as requested. There was a hardware error associated with this request. One of the passed in parameters was incorrectly formatted or its value was out of bounds.

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time
Summary
Displays or sets the current time for the system.

Usage time [hh:mm[:ss]] [-tz tz] [-d dl]

Options hh New hour (0-23) (required) mm New minute (0-59) (required) ss New second (0-59) If not specified, then zero will be used. -tz Timezone adjustment, measured in minutes offset from GMT. Valid values can be between -1440 and 1440 or 2047. If not present or set to 2047, time is interpreted as local time. -d Indicates that time is not affected by daylight savings time (0), time is affected by daylight savings time but time has not been adjusted (1), or time is affected by daylight savings time and has been adjusted (3).. All other values are invalid. If no value follows –d, then the current daylight savings time will be displayed.

Description
This command displays or sets the current time for the system. If no parameters are used, it shows the current time. If valid hours, minutes, and seconds are provided, then the system's time will be updated. Note the following rules: Except for numeric characters and the : character, all other characters in the argument are invalid. The Shell will report an error if the number is in the wrong hour/minute/second range. Spaces before or after the numeric character are not allowed. Spaces inserted into the number are not allowed either. Repeated zeros are allowed before the number. For example:

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Shell > time 00000017:000004:0000 Shell > time 17:04:00 (GMT+08:00) Shell > The seconds parameter is optional. If there is no seconds number, it will set to zero by default.

Status Codes Returned
SHELL_SUCCESS SHELL_DEVICE_ERROR SHELL_SECURITY_VIOLATION SHELL_INVALID_PARAMETER
The action was completed as requested. There was a hardware error preventing the completion of this command This function was not performed due to a security violation One of the passed in parameters was incorrectly formatted or its value was out of bounds.

Examples
Shell > time 17:23 Shell > time 17:23:00 (GMT+08:00) Shell > time 17:23: Shell > time 17:23:00 (GMT+08:00) To display current time: fs0:\> time 16:51:03 (GMT+08:00) To set the system time: fs0:\> time 9:51:30 fs0:\> time 09:51:31 (GMT+08:00) To get the time, including daylight savings time: fs0:\> time 9:51:30 fs0:\> time –d 09:51:31 (GMT+08:00) DST: Not Affected

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timezone
Summary
Displays or sets time zone information.

Usage timezone [-s hh:mm | -l] [-b] [-f]

Options
-s Set time zone associated with hh:mm offset from GMT -l Display list of all time zones -b Display one screen at a time -f Display full information for specified timezone

Description
This command displays and sets the current time zone for the system. If no parameters are used, it shows the current time zone. If a valid hh:mm parameter is provided, then the system's time zone information will be updated.

Examples
To display all available time zones:

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Shell> timezone -l GMT-12:00, International Date Line West GMT-11:00, Midway Island, Samoa GMT-10:00, Hawaii GMT-09:00, Alaska GMT-08:00, Pacific Time(US & Canada); Tijuana GMT-07:00, Arizona, Chihuahua, La Paz, Mazatlan GMT-06:00, Central America, Central Time(US & Canada) GMT-05:00, Bogota, Lima, Quito, Eastern Time(US & Canada) GMT-04:00, Atlantic Time(Canada), Caracas, Santiago GMT-03:30, Newfoundland GMT-03:00, Brasilia, Buenos Aires, Georgetown, Greenland GMT-02:00, Mid-Atlantic GMT-01:00, Azores, Cape Verde Is. GMT, Greenwich Mean Time, Casablanca, Monrovia, Dublin, London GMT+01:00, Amsterdam, Berlin, Bern, Rome, Paris, West Central Africa GMT+02:00, Athens, Istanbul, Bucharest, Cairo, Jerusalem GMT+03:00, Baghdad, Kuwait, Riyadh, Moscow, Nairobi GMT+03:30, Tehran GMT+04:00, Abu Dhabi, Muscat, Baku, Tbilisi, Yerevan GMT+04:30, Kabul GMT+05:00, Ekaterinburg, Islamabad, Karachi, Tashkent GMT+05:30, Chennai, Kolkata, Mumbai, New Delhi GMT+05:45, Kathmandu GMT+06:00, Almaty, Novosibirsk, Astana, Dhaka, Sri Jayawardenepura GMT+06:30, Rangoon GMT+07:00, Bangkok, Hanio, Jakarta, Krasnoyarsk GMT+08:00, Beijing, Chongqing, Hong Kong, Urumqi, Taipei, Perth GMT+09:00, Osaka, Sapporo, Tokyo, Seoul, Yakutsk GMT+09:30, Adelaide, Darwin GMT+10:00, Canberra, Melbourne, Sydney, Guam, Hobart, Vladivostok GMT+11:00, Magadan, Solomon Is., New Caledonia GMT+12:00, Auckland, Wellington, Fiji, Kamchatka, Marshall Is. GMT+13:00, Nuku'alofa To set the time zone: Shell> timezone -s -7:00 Shell> timezone GMT-07:00 Shell> timezone -s 5:00 Shell> timezone GMT+05:00 To display detailed information for the current time zone: Shell> timezone -f GMT+05:00, Ekaterinburg, Islamabad, Karachi, Tashkent Shell> timezone GMT+05:00

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touch
Summary
Updates the time and date on a file to the current time and date.

Usage touch [-r] file [file …]

Options file The name or pattern of the file or directory. There can be multiple files on the command-line. -r Recurse into subdirectories

Description
This command updates the time and date on the file that is specified by the file parameter to the current time and date. If multiple files are specified on the command line, it will continue processing. It will touch the files one by one and errors will be ignored. Touch cannot change the time and date of read-only files and directories.

Status Codes Returned
SHELL_SUCCESS SHELL_NOT_FOUND SHELL_SECURITY_VIOLATION SHELL_WRITE_PROTECTED
The action was completed as requested. The target file or set of files were not found. This function was not performed due to a security violation The media was write-protected or the file had a read-only attribute associated with it.

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type
Summary
Sends the contents of a file to the standard output device.

Usage type [-a|-u] file [file...]

Options file Name of the file to display. -a Display the file as if it is encoded as 8-bit ASCII -u Displays the file as if it were encoded as UCS-2 Unicode.

Description
This command sends the contents of a file to the standard output device. If no options are used, then the command attempts to automatically detect the file type. If it fails, then UCS-2 is presumed. If the -a option is specified, the file is sent to the standard output device as a stream of ASCII characters. If the -u option is specified, the file is sent to the standard output device as a stream of Unicode (UCS-2) characters.

Status Codes Returned
SHELL_SUCCESS SHELL_INVALID_PARAMETER SHELL_SECURITY_VIOLATION SHELL_NOT_FOUND
The action was completed as requested. One of the passed in parameters was incorrectly formatted or its value was out of bounds. This function was not performed due to a security violation The target file or set of files were not found.

Examples
To display a file in UCS-2 format:

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fs0:\> type -u pause.nsh # # Example script for 'pause' command # echo pause.nsh begin.. date time pause echo pause.nsh done.

To display multiple files: fs0:\> type test.* How to Install? time stall 3000000 time

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unload
Summary
Unloads a driver image that was already loaded.

Usage unload [-n] [-v|-verbose] Handle

Options
-n Skips all prompts during unloading, so that it can be used in a script file. -v, -verbose Dump verbose status information before the image is unloaded. Handle Handle of driver to unload, always taken as hexadecimal number

Description
This command unloads a driver image that was already loaded and which supports the unloading option (see EFI_LOADED_IMAGE_PROTOCOL’s Unload() member.)

Status Codes Returned
SHELL_SUCCESS SHELL_SECURITY_VIOLATION SHELL_INVALID_PARAMETER
The action was completed as requested. This function was not performed due to a security violation One of the passed in parameters was incorrectly formatted or its value was out of bounds.

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ver
Summary
Displays the version information for the UEFI Shell and the underlying UEFI firmware.

Usage ver [-s|-terse]

Options
-s Displays only the UEFI Shell version -terse

Description
This command displays the version information for this EFI Firmware or the version information for the UEFI Shell itself. The information is retrieved through the EFI System Table or the Shell image. UEFI Shell v shell-supplier-specific-data UEFI v (, 0x )

UEFI Basic Shell v2.0 Build 8192. Copyright 2008 by Intel(R) Corporation. UEFI v2.10 Firmware (Phoenix Technologies Ltd., 0x01014318)

0 = Minimal, 1 = Scripting, 2 = Basic, 3 = Interactive comes from the shell spec upon which the shell implementation is based. Build, copyright, etc.

From the EFI System Table's Hdr.Revision field, formatted as two period delimited fields. The first field is the upper 16-bits of this field, represented as a decimal unsigned integer. The second field is the lower 16-bites of this field, represented as a two-digit, zero-filled decimal unsigned integer. From the EFI System Table's FirmwareVendor field

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 From the EFI System Table's FIrmwareRevision field

Status Codes Returned
SHELL_SUCCESS The action was completed as requested.

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vol
Summary
Displays the volume information for the file system that is specified by fs.

Usage vol [fs] [-n ] vol [fs] [-d]

Options fs The name of the file system. VolumeLabel The name of the file system. The following characters cannot be used: % ^ * + = [ ] | : ; “ < > ? / . No spaces are allowed in the volume label. -d Empty volume label.

Description
This command displays the volume information for the file system that is specified by fs. If fs is not specified, the current file system will be used. If -n is specified, then the volume label for fs will be set to VolumeLabel. The maximum length for VolumeLabel is 11 characters.

Status Codes Returned
SHELL_SUCCESS SHELL_INVALID_PARAMETER SHELL_SECURITY_VIOLATION SHELL_NOT_FOUND
The action was completed as requested. One of the passed in parameters was incorrectly formatted or its value was out of bounds. This function was not performed due to a security violation The target file-system was not found

Examples
To display the volume of the current fs: fs0:\> vol Volume has no label (rw) 1,457,664 bytes total disk space 1,149,440 bytes available on disk 512 bytes in each allocation unit To change the label of fs0:

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shell> vol fs0 –n help_test Volume HELP_TEST (rw) 1,457,664 bytes total disk space 1,149,440 bytes available on disk 512 bytes in each allocation unit To get rid of the label of fs0: fs0:\> vol fs0 -d Volume has no label (rw) 1,457,664 bytes total disk space 220,160 bytes available on disk 512 bytes in each allocation unit

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Appendix A UEFI Shell Consistent Mapping Design
This appendix describes how device assignments are created.

A.1

Requirement:
1.
The shell shall support consistent device assignments across (through) reboots. e.g. same concept as how you assign the letter D: to a partition under DOS/Windows.

2.

The shell commands shall support defining mappings. For identical machines with the same hardware configurations the mapping result should always be the same.

3.

Not use the NV storage. In the OS, it is easy to implement the consistent mapping, because it can store the mapping info on the hard disk or other storage. The firmware has no large storage to store all of this system info. To save space, it is strongly desired that such mapping data does not use NV storage to maintain this data.

A.2 A.2.1

Design
What does consistent mapping mean?
If hardware configuration is not changed, the mappings should not change. EXAMPLE: map –r, reboot, map -r will not change the mappings. If two or more machines have the same hardware configurations, mapping result should be the same.

A.2.2

Hardware configuration change:
Generally, buses, controllers, hubs or bridges changing mean hardware configuration change.

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The change of the number or physical connection of hardware which can have child hardware devices will be considered as hardware configuration change.

Example: A.2.2.1 Hardware configuration change example
1. 2. 3.
Change IDE disk from IDE primary master to slave Change USB device from port0 to port1 Add or remove a SCSI controller adapt card
Formatted: Bullets and Numbering

A.2.2.2

Hardware configuration not change example
1. 2. 3. 4.
Remove floppy/cdrom disk in drive will not affect mapped names of other existing names Remove floppy/cdrom, then insert back, the newly mapped name will be the same as the last time it was mapped. Unplugging a usb device will not affect mapped names of other existing names Unplug usb device, then plug back to the same port, the newly mapped will be the same as the last time it was mapped.
Formatted: Bullets and Numbering

A.2.3

Mapping generated from device path
The device path is used to generate the mapping, because in a platform, the device path is unique and if the hardware configuration doesn’t change, the device’s device path doesn’t change.

A.2.4

Consistent Mapping
A consistent mapping consists of 3 parts: MTD(Media Type Descriptor): ROM, …etc.) A string carries device’s media info (harddisk, CD-

1. 2. 3.

Auxiliary name of media type, determined by device path Matches with EFI device path specification Proposed name (hd for harddisk, cd for CD-ROM, fp for floppy, etc.)
Formatted: Bullets and Numbering

HI(Hardware Index): The index of the hardware device path node described in current device path. The index is determined by the position of the whole sorted hardware device path node in system.

1.

Extract the hardware device path node and ACPI device path node from each device path in system, make a condensed device path.
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2. 3.

Use certain algorithm to sort all the condensed device paths Adding/Removing controller(s) would change the index (hardware configuration change)
Formatted: Bullets and Numbering

CSD(Connection Specific Descriptor): A string of numbers and characters, which identifies how the device connects to parent controller.

1. 2.

Specify the connection of device use one or several numbers or characters to describe each media and messaging device path node in device path to specify the connection
Formatted: Bullets and Numbering

A.2.5

Example (USB Devices)
Hardware Configuration (USB part) 4 UHC 7 USB devices: 4 Hard disks, 3 hub Other hardware are ignored when mapping usb subsystem Device Path (controllers are underlined) acpi(pnp0a03,0)/pci(1d,0)/usb(0,1)/usb(1,1)/HD(Part4, sigxxx) acpi(pnp0a03,0)/pci(1d,3)/usb(0,1)/usb(5,1)/HD(Part2, sigxxx) acpi(pnp0a03,0)/pci(1d,1)/usb(1,0)/HD(Part3, sigxxx) acpi(pnp0a03,0)/pci(1d,2)/usb(1,0)/ usb(2,0)/HD(Part1, sigxxx) Steps to determine the consistent mapping for devices:

1. 2. 3. 4.

Determine the MTD Determine the HI Determine the CSD Make the final mapping
Formatted: Bullets and Numbering

A.2.5.1

Step 1: Determine MTD
MTD for all devices: • • • • … More names will be added according to the evolution of UEFI specification hd is defined for harddisk. cd is defined for CD-ROM. fp is defined for floppy. f is defined for unknown device.

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The 4 USB devices are the hard disks, so their MTDs are “hd”.

A.2.5.2

Step 2: Determine HI
HI is determined by ACPI device path node and hardware device path node

1. 2. 3.

Algorithm to calculate the HI Enumerate all device path exist in system, whether there is a file system on it or not. Split the device path: the hardware and ACPI device path node part consists of the HI device path that generates the HI and the remain device path consist the CSD device path which generate the CSD.
Formatted: Bullets and Numbering

acpi(pnp0a03,0)/pci(1d|0)/usb(0,1)/usb(1,1)/HD(Part4, sigxxx)

acpi(pnp0a03,0)/pci(1d|0) HI device path, for generate HI.

usb(0,1)/usb(1,1)/HD(Part4, sigxxx) CSD device path, for generate CSD.

Each kind of device path node has its own compare algorithm. For acpi device path node, the compare algorithm is: acpi(h1, u1) > acpi(h2, u2) only if h1 > h2 or (h1 = h2 and u1 > u2) For pci device path node, the compare algorithm is: pci(d1, f1) > pci (d2, f2) only if d1 > d2 or (d1 = d2 and f1>f2) For example: acpi(pnp0a03,0)/pci(1d|0) d2 or (d1 = d2 and f1>f2) } If (DeviceSubType(Node) == ACPI) { pci(d1, f1) > pci (d2, f2) only if d1 > d2 or (d1 = d2 and f1>f2) } If(Length(Node) != Length(Node2)) { Return (Length(Node1) – Length(Node2); } Return memcmp(Node1, Node2, Length(Node1)); }

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Appendix B UEFI Help Manual Page Syntax
The manual page files are standard text files with title and section heading information embedded using commands which begin with a ‘.’. The following two macros are supported:

.TH command-name 0 “short-description” Title header. When printing multi-page help, this will appear at the top of each page. .SH section-name Sub-header. Specifies one of several standard sub-headings.

Table 30 Subheadings and descriptions
Sub-Heading Name Description The name of the function or command, along with a one-line summary. Usage of the command General description Description of all options and parameters. Values returned. Environment variables used Files associated with the subject. Examples and suggestions. Errors reported by the command. Conformance to applicable standards. Errors and caveats. The comma-delimited list of categories to which this command belongs. Category names must follow normal file naming conventions. Category names which begin with ‘_’ will not be used in the specification. See section TBD (“Command-Line Help”) for more information on how this category is used when installing new commands. Other sections added by the help author.

NAME SYNOPISIS DESCRIPTION OPTIONS RETURN VALUES ENVIRONMENT VARIABLES FILES EXAMPLES ERRORS STANDARDS BUGS CATEGORY

other

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Appendix C UEFI Shell Status Codes
Most UEFI Shell commands return SHELL_STATUS code values. These UEFI Shell status codes are enumerated below.

Table 31 SHELL_STATUS return codes
Mnemonic Value 0 1 2 3 4 5 Description The operation completed successfully The image failed to load. There was an error in the command-line options. The operation is not supported. The buffer was not the proper size for the request. The buffer is not large enough to hold the requested data. The required buffer size is returned in the appropriate parameter when this error occurs. There is no data pending upon return. The physical device reported an error while attempting the operation. The device cannot be written to. A resource has run out. An inconstancy was detected on the file system causing the operating to fail. There is no more space on the file system. The device does not contain any medium to perform the operation. The medium in the device has changed since the last access. The item was not found. Access was denied. The timeout time expired. The specified operation could not be started. The specified operation had already started. The operation was aborted by the user The function encountered an internal version that was incompatible with a version requested by the caller.

SHELL_SUCCESS SHELL_LOAD_ERROR SHELL_INVALID_PARAMETER SHELL_UNSUPPORTED SHELL_BAD_BUFFER_SIZE SHELL_BUFFER_TOO_SMALL

SHELL_NOT_READY SHELL_DEVICE_ERROR SHELL_WRITE_PROTECTED SHELL_OUT_OF_RESOURCES SHELL_VOLUME_CORRUPTED SHELL_VOLUME_FULL SHELL_NO_MEDIA SHELL_MEDIA_CHANGED SHELL_NOT_FOUND SHELL_ACCESS_DENIED SHELL_TIMEOUT SHELL_NOT_STARTED SHELL_ALREADY_STARTED SHELL_ABORTED SHELL_INCOMPATIBLE_VERSION

6 7 8 9 10 11 12 13 14 15 18 19 20 21 25

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SHELL_SECURITY_VIOLATION SHELL_NOT_EQUAL

26 27

The function was not performed due to a security violation. The function was performed and resulted in an unequal comparison..

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Appendix D UEFI Shell Command Standard Formatted Output
This section describes the general, table-based standard output format for UEFI shell commands. The format is designed so that tools can easily process output produced by shell commands. UEFI shell commands using standard formatted output display the same information they would normally display, except using rows and columns of comma-delimited data. The first column always contains a C-style identifier which describes the type of data on the row. This identifier is known as the table name. Table names which begin with the ‘_’ character are implementation-specific. The second and subsequent columns are quoted C-style strings containing the actual UEFI shell command data. For each UEFI shell command, the format and meaning of each column depends on the column number and the table name. Shell commands which support the –sfo option will always produce the table name ShellCommand. The second column contains the name of the shell command without any extension. For example: ShellCommand,”ls” For example: FileInfo,"fs0:/efi/boot/winloader.efi","45670","arsh" FileInfo,"fs0:/efi/boot/timsfile.txt","1250","a" FileInfo,"fs0:/efi/boot/readme.txt","795","a" In the syntax below, an identifier is a C-style identifier, which starts with an alphabetic character or underscore. A quoted string starts with a double-quotation mark (“) character, followed by zero or more characters and concluding with a doublequotation mark (“) character. Quotation marks in the string must be escaped by using a ^ character (i.e. ^”). The ^ character may be inserted using ^^.

Extended Syntax sfo-format := sfo-row sfo-row sfo-row sfo-table-name sfo-columns
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:= sfo-table-name, sfo-columns := identifier := sfo-column |

sfo-columns, | sfo-column sfo-column := quoted-string |

Example
VolumeInfo, "TimsVolume","400000000","32000000","16000000" FileInfo, "fs0:/efi/boot/winloader.efi","45670","arsh" FileInfo, "fs0:/efi/boot/timsfile.txt","1250","a" FileInfo, "fs0:/efi/boot/readme.txt","795","a"

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