在实验中，我发现 QEMU 启动的虚拟机并不支持调出 BootMenu，为此研究一下如何修改BIOS 添加这个功能。
前面的实验中，我们在启动项目中插入了自定义的 Application，主要代码在BdsPlatform.c 中。继续查看这个文件，可以看到分配快捷键的代码：
VOID
PlatformRegisterOptionsAndKeys (
VOID
)
{
EFI_STATUS Status;
EFI_INPUT_KEY Enter;
EFI_INPUT_KEY F2;
EFI_INPUT_KEY Esc;
EFI_BOOT_MANAGER_LOAD_OPTION BootOption;
//
// Register ENTER as CONTINUE key
//
Enter.ScanCode = SCAN_NULL;
Enter.UnicodeChar = CHAR_CARRIAGE_RETURN;
Status = EfiBootManagerRegisterContinueKeyOption (0, &Enter, NULL);
ASSERT_EFI_ERROR (Status);
//
// Map F2 to Boot Manager Menu
//
F2.ScanCode = SCAN_F2;
F2.UnicodeChar = CHAR_NULL;
Esc.ScanCode = SCAN_ESC;
Esc.UnicodeChar = CHAR_NULL;
Status = EfiBootManagerGetBootManagerMenu (&BootOption);
ASSERT_EFI_ERROR (Status);
Status = EfiBootManagerAddKeyOptionVariable (
NULL, (UINT16) BootOption.OptionNumber, 0, &F2, NULL
);
ASSERT (Status == EFI_SUCCESS || Status == EFI_ALREADY_STARTED);
Status = EfiBootManagerAddKeyOptionVariable (
NULL, (UINT16) BootOption.OptionNumber, 0, &Esc, NULL
);
ASSERT (Status == EFI_SUCCESS || Status == EFI_ALREADY_STARTED);
}
和EmulatorPkg 中的PlatformBdsRegisterStaticBootOptions() 函数进行对比（代码位于 \EmulatorPkg\Library\PlatformBmLib\PlatformBm.c中），可以看到后者注册了多个快捷键对应着不同的功能：
/**
Register the static boot options.
**/
VOID
PlatformBdsRegisterStaticBootOptions (
VOID
)
{
EFI_GRAPHICS_OUTPUT_BLT_PIXEL Black;
EFI_GRAPHICS_OUTPUT_BLT_PIXEL White;
EFI_INPUT_KEY Enter;
EFI_INPUT_KEY F2;
EFI_INPUT_KEY F7;
EFI_BOOT_MANAGER_LOAD_OPTION BootOption;
UINTN OptionNumber;
Black.Blue = Black.Green = Black.Red = Black.Reserved = 0;
White.Blue = White.Green = White.Red = White.Reserved = 0xFF;
//
// Register ENTER as CONTINUE key
//
Enter.ScanCode = SCAN_NULL;
Enter.UnicodeChar = CHAR_CARRIAGE_RETURN;
EfiBootManagerRegisterContinueKeyOption (0, &Enter, NULL);
//
// Map F2 to Boot Manager Menu
//
F2.ScanCode = SCAN_F2;
F2.UnicodeChar = CHAR_NULL;
EfiBootManagerGetBootManagerMenu (&BootOption);
EfiBootManagerAddKeyOptionVariable (NULL, (UINT16) BootOption.OptionNumber, 0, &F2, NULL);
//
// 3. Boot Device List menu
//
F7.ScanCode = SCAN_F7;
F7.UnicodeChar = CHAR_NULL;
OptionNumber = GetBootManagerMenuAppOption ();
EfiBootManagerAddKeyOptionVariable (NULL, (UINT16)OptionNumber, 0, &F7, NULL);
PrintXY (10, 10, &White, &Black, L"F2 to enter Setup. ");
PrintXY (10, 30, &White, &Black, L"F7 to enter Boot Manager Menu.");
PrintXY (10, 50, &White, &Black, L"Enter to boot directly.");
}
最终修改\OvmfPkg\Library\PlatformBootManagerLib\BdsPlatform.c 代码如下:
//LABZ_Start
EFI_GUID mBootMenuFile = {
0xEEC25BDC, 0x67F2, 0x4D95, { 0xB1, 0xD5, 0xF8, 0x1B, 0x20, 0x39, 0xD1, 0x1D }
};
/**
Check if it's a Device Path pointing to BootManagerMenuApp.
@param DevicePath Input device path.
@retval TRUE The device path is BootManagerMenuApp File Device Path.
@retval FALSE The device path is NOT BootManagerMenuApp File Device Path.
**/
BOOLEAN
IsBootManagerMenuAppFilePath (
EFI_DEVICE_PATH_PROTOCOL *DevicePath
)
{
EFI_HANDLE FvHandle;
VOID *NameGuid;
EFI_STATUS Status;
Status = gBS->LocateDevicePath (&gEfiFirmwareVolume2ProtocolGuid, &DevicePath, &FvHandle);
if (!EFI_ERROR (Status)) {
NameGuid = EfiGetNameGuidFromFwVolDevicePathNode ((CONST MEDIA_FW_VOL_FILEPATH_DEVICE_PATH *) DevicePath);
if (NameGuid != NULL) {
return CompareGuid (NameGuid, &mBootMenuFile);
}
}
return FALSE;
}
EFI_DEVICE_PATH *
FvFilePath (
EFI_GUID *FileGuid
)
{
EFI_STATUS Status;
EFI_LOADED_IMAGE_PROTOCOL *LoadedImage;
MEDIA_FW_VOL_FILEPATH_DEVICE_PATH FileNode;
EfiInitializeFwVolDevicepathNode (&FileNode, FileGuid);
Status = gBS->HandleProtocol (
gImageHandle,
&gEfiLoadedImageProtocolGuid,
(VOID **) &LoadedImage
);
ASSERT_EFI_ERROR (Status);
return AppendDevicePathNode (
DevicePathFromHandle (LoadedImage->DeviceHandle),
(EFI_DEVICE_PATH_PROTOCOL *) &FileNode
);
}
/**
Create one boot option for BootManagerMenuApp.
@param FileGuid Input file guid for the BootManagerMenuApp.
@param Description Description of the BootManagerMenuApp boot option.
@param Position Position of the new load option to put in the ****Order variable.
@param IsBootCategory Whether this is a boot category.
@retval OptionNumber Return the option number info.
**/
UINTN
RegisterBootManagerMenuAppBootOption (
EFI_GUID *FileGuid,
CHAR16 *Description,
UINTN Position,
BOOLEAN IsBootCategory
)
{
EFI_STATUS Status;
EFI_BOOT_MANAGER_LOAD_OPTION NewOption;
EFI_DEVICE_PATH_PROTOCOL *DevicePath;
UINTN OptionNumber;
DevicePath = FvFilePath (FileGuid);
Status = EfiBootManagerInitializeLoadOption (
&NewOption,
LoadOptionNumberUnassigned,
LoadOptionTypeBoot,
IsBootCategory ? LOAD_OPTION_ACTIVE : LOAD_OPTION_CATEGORY_APP,
Description,
DevicePath,
NULL,
0
);
ASSERT_EFI_ERROR (Status);
FreePool (DevicePath);
Status = EfiBootManagerAddLoadOptionVariable (&NewOption, Position);
ASSERT_EFI_ERROR (Status);
OptionNumber = NewOption.OptionNumber;
EfiBootManagerFreeLoadOption (&NewOption);
return OptionNumber;
}
/**
Return the boot option number to the BootManagerMenuApp.
If not found it in the current boot option, create a new one.
@retval OptionNumber Return the boot option number to the BootManagerMenuApp.
**/
UINTN
GetBootManagerMenuAppOption (
VOID
)
{
UINTN BootOptionCount;
EFI_BOOT_MANAGER_LOAD_OPTION *BootOptions;
UINTN Index;
UINTN OptionNumber;
OptionNumber = 0;
BootOptions = EfiBootManagerGetLoadOptions (&BootOptionCount, LoadOptionTypeBoot);
for (Index = 0; Index < BootOptionCount; Index++) {
if (IsBootManagerMenuAppFilePath (BootOptions[Index].FilePath)) {
OptionNumber = BootOptions[Index].OptionNumber;
break;
}
}
EfiBootManagerFreeLoadOptions (BootOptions, BootOptionCount);
if (Index >= BootOptionCount) {
//
// If not found the BootManagerMenuApp, create it.
//
OptionNumber = (UINT16) RegisterBootManagerMenuAppBootOption (&mBootMenuFile, L"UEFI BootManagerMenuApp", (UINTN) -1, FALSE);
}
return OptionNumber;
}
//LABZ_End
VOID
PlatformRegisterOptionsAndKeys (
VOID
)
{
EFI_STATUS Status;
EFI_INPUT_KEY Enter;
EFI_INPUT_KEY F2;
EFI_INPUT_KEY F7;
EFI_INPUT_KEY Esc;
EFI_BOOT_MANAGER_LOAD_OPTION BootOption;
UINTN OptionNumber;
//
// Register ENTER as CONTINUE key
//
Enter.ScanCode = SCAN_NULL;
Enter.UnicodeChar = CHAR_CARRIAGE_RETURN;
Status = EfiBootManagerRegisterContinueKeyOption (0, &Enter, NULL);
ASSERT_EFI_ERROR (Status);
//
// Map F2 to Boot Manager Menu
//
F2.ScanCode = SCAN_F2;
F2.UnicodeChar = CHAR_NULL;
Esc.ScanCode = SCAN_ESC;
Esc.UnicodeChar = CHAR_NULL;
Status = EfiBootManagerGetBootManagerMenu (&BootOption);
ASSERT_EFI_ERROR (Status);
Status = EfiBootManagerAddKeyOptionVariable (
NULL, (UINT16) BootOption.OptionNumber, 0, &F2, NULL
);
ASSERT (Status == EFI_SUCCESS || Status == EFI_ALREADY_STARTED);
Status = EfiBootManagerAddKeyOptionVariable (
NULL, (UINT16) BootOption.OptionNumber, 0, &Esc, NULL
);
ASSERT (Status == EFI_SUCCESS || Status == EFI_ALREADY_STARTED);
//LABZ_Start
//
// 3. Boot Device List menu
//
F7.ScanCode = SCAN_F7;
F7.UnicodeChar = CHAR_NULL;
OptionNumber = GetBootManagerMenuAppOption ();
EfiBootManagerAddKeyOptionVariable (NULL, (UINT16)OptionNumber, 0, &F7, NULL);
//LABZ_End
}
此外，在 \OvmfPkg\OvmfPkgX64.dsc 中添加BootManagerMenuApp.inf如下：
<PcdsFixedAtBuild>
gEfiMdePkgTokenSpaceGuid.PcdDebugPropertyMask|0xFF
gEfiShellPkgTokenSpaceGuid.PcdShellLibAutoInitialize|FALSE
gEfiMdePkgTokenSpaceGuid.PcdUefiLibMaxPrintBufferSize|8000
}
MdeModulePkg/Application/BootManagerMenuApp/BootManagerMenuApp.inf
!if $(SECURE_BOOT_ENABLE) == TRUE
SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigDxe.inf
OvmfPkg/EnrollDefaultKeys/EnrollDefaultKeys.inf
!endif
\OvmfPkg\OvmfPkgX64.fdf修改如下：
!if $(TOOL_CHAIN_TAG) != "XCODE5"
INF ShellPkg/DynamicCommand/TftpDynamicCommand/TftpDynamicCommand.inf
INF ShellPkg/DynamicCommand/HttpDynamicCommand/HttpDynamicCommand.inf
INF OvmfPkg/LinuxInitrdDynamicShellCommand/LinuxInitrdDynamicShellCommand.inf
!endif
INF ShellPkg/Application/Shell/Shell.inf
INF MdeModulePkg/Application/BootManagerMenuApp/BootManagerMenuApp.inf
INF MdeModulePkg/Logo/LogoDxe.inf
#
# Network modules
#
!if $(E1000_ENABLE)
可以看到整体和之前的“BootMenu插入自己的Application”并无多大差别，只是多了使用EfiBootManagerAddKeyOptionVariable() 函数将 Application 和快捷键关联起来的。
运行结果：
大佬，这个有boot menu的固件还有吗？我很需要这个，请问能发一份吗？因为这可能是我启动时间很方便，谢谢大佬(*^o^*)
有可能不是你的问题，我刚才试验了一下，新的 EDK2 + 旧版本的 OVMF 启动的时候会出错；然后新的 EDK2+新的 OVMF 修改 BootMenu无法进入 Setup 界面。
打扰一下，可以把这个带有boot menu的efi固件发一下吗，我现在很需要，谢谢大佬
原来的测试 OK 的现在找不到了，新的 EDK2 这里有问题
大佬，可以把那个带有bootmenu的efi固件发一下吗，我想让我的启动比较方便，谢谢大佬(*^o^*)
用百度网盘发就可以