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OvmfPkg: add 'initrd' shell command to expose Linux initrd via device path

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Add a new 'initrd' command to the UEFI Shell that allows any file that is
accessible to the shell to be registered as the initrd that is returned
when Linux's EFI stub loader invokes the LoadFile2 protocol on its special
vendor media device path.

Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2564
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Ard Biesheuvel
2020-02-26 20:43:39 +01:00
committed by mergify[bot]
parent 15bee1937f
commit 2632178bc6
3 changed files with 531 additions and 0 deletions
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OvmfPkg/LinuxInitrdDynamicShellCommand/LinuxInitrdDynamicShellCommand.uni Normal file
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// /**
//
// Copyright (c) 2020, Arm, Ltd. All rights reserved.<BR>
// SPDX-License-Identifier: BSD-2-Clause-Patent
//
// Module Name:
//
// LinuxInitrdDynamicShellCommand.uni
//
// Abstract:
//
// String definitions for 'initrd' UEFI Shell command
//
// **/
/=#
#langdef en-US "english"
#string STR_GEN_PROBLEM #language en-US "%H%s%N: Unknown flag - '%H%s%N'\r\n"
#string STR_GEN_TOO_MANY #language en-US "%H%s%N: Too many arguments.\r\n"
#string STR_GEN_TOO_FEW #language en-US "%H%s%N: Too few arguments.\r\n"
#string STR_GEN_FIND_FAIL #language en-US "%H%s%N: File not found - '%H%s%N'\r\n"
#string STR_GEN_FILE_OPEN_FAIL #language en-US "%H%s%N: Cannot open file - '%H%s%N'\r\n"
#string STR_GET_HELP_INITRD #language en-US ""
".TH initrd 0 "Registers or unregisters a file as Linux initrd."\r\n"
".SH NAME\r\n"
"Registers or unregisters a file as Linux initrd.\r\n"
".SH SYNOPSIS\r\n"
" \r\n"
"initrd <FileName>\r\n"
"initrd -u\r\n"
".SH OPTIONS\r\n"
" \r\n"
" FileName - Specifies a file to register as initrd.\r\n"
" -u - Unregisters any previously registered initrd files.\r\n"
".SH DESCRIPTION\r\n"
" \r\n"
"NOTES:\r\n"
" 1. Only a single file can be loaded as initrd at any given time. Using the\r\n"
" command twice with a <FileName> option will result in the first file to\r\n"
" be unloaded again, regardless of whether the second invocation succeeded\r\n"
" or not.\r\n"
" 2. The initrd is not unloaded when the shell exits, and will remain active\r\n"
" until it is unloaded again by a different invocation of the shell.\r\n"
" Consumers of the LoadFile2 protocol on the LINUX_EFI_INITRD_MEDIA_GUID\r\n"
" device path that are started via means other than the shell will be able\r\n"
" to locate the protocol and invoke it.\r\n"