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4 Using the UEFI Programming Model

The UEFI Shell provides a programming API. You can use it to write your own UEFI applications

for calling some of the Shell programmatic APIs or protocols. For more information, see the UEFI

Shell Specification and EDK2. The UEFI Shell provides a programming API as listed in Table 13

(page 68). EFI_SHELL_PROTOCOL provides shell services to UEFI applications. It provides UEFI

shell applications access to the low-level shell functions, including: files, pipes, environment variables,

the current working directory, mappings, help text, aliases, and launching shell applications and

scripts.

Table 13 UEFI Application APIs

DescriptionFunction NameFunction Type

Causes the shell to parse and execute the

command line.

ExecuteEFI_SHELL_EXECUTE

Gets the environment variable.GetEnvEFI_SHELL_GET_ENV

Changes a specific environment variable.SetEnvEFI_SHELL_SET_ENV

Retrieves the alias for a specific shell

command.

GetAliasEFI_SHELL_GET_ALIAS

Adds or removes the alias for a specific shell

command.

SetAliasEFI_SHELL_SET_ALIAS

Return help information about a specific

command.

GetHelpTextEFI_SHELL_GET_HELP_TEXT

Returns the device path that corresponds to

a mapping.

GetDevicePathFromMapEFI_SHELL_GET_DEVICE_PATH_FROM_MAP

Returns the mapping that corresponds to a

particular device path.

GetMapFromDevicePathEFI_SHELL_GET_MAP_FROM_DEVICE_PATH

Converts a file path to a device path, where

all mappings have been replaced with the

corresponding device paths.

GetDevicePathFromFilePathEFI_SHELL_GET_DEVICE_PATH_FROM_FILE_PATH

Converts a device path to a file path, where

the portion of the device path corresponding

GetFilePathFromDevicePathEFI_SHELL_GET_FILE_PATH_FROM_DEVICE_PATH

to one of the mappings is replaced with that

mapping.

It creates/updates/deletes a mapping

between a device and a device path.

SetMapEFI_SHELL_SET_MAP

Returns the current directory on a device.GetCurDirEFI_SHELL_GET_CUR_DIR

Changes the current directory on a device.SetCurDirEFI_SHELL_SET_CUR_DIR

Opens the files that match the path pattern

specified.

OpenFileListEFI_SHELL_OPEN_FILE_LIST

Frees the file list that created by OpenFileList().FreeFileListEFI_SHELL_FREE_FILE_LIST

Deletes the duplicate files in the given file list.RemoveDupInFileListEFI_SHELL_REMOVE_DUP_IN_FILE_LIST

Returns whether any script files are currently

being processed.

BatchIsActiveEFI_SHELL_BATCH_IS_ACTIVE

Judges whether the active Shell is the root

shell.

IsRootShellEFI_SHELL_IS_ROOT_SHELL

Enables the page break output mode.EnablePageBreakEFI_SHELL_ENABLE_PAGE_BREAK

Disables the page break output mode.DisablePageBreakEFI_SHELL_DISABLE_PAGE_BREAK

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