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/*
* Copyright (c) 2021, Konstantin Aladyshev <aladyshev22@gmail.com>
*
* SPDX-License-Identifier: MIT
*/
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/UefiRuntimeServicesTableLib.h>
#include <Library/DevicePathLib.h>
#include <Library/PrintLib.h>
EFI_STATUS
GetNvramVariable( CHAR16 *VariableName,
EFI_GUID *VariableOwnerGuid,
VOID **Buffer,
UINTN *BufferSize)
{
UINTN Size = 0;
*BufferSize = 0;
EFI_STATUS Status = gRT->GetVariable(VariableName, VariableOwnerGuid, NULL, &Size, NULL);
if (Status != EFI_BUFFER_TOO_SMALL) {
Print(L"Error! 'gRT->GetVariable' call returned %r\n", Status);
return Status;
}
*Buffer = AllocateZeroPool(Size);
if (!Buffer) {
Print(L"Error! 'AllocateZeroPool' call returned %r\n", Status);
return EFI_OUT_OF_RESOURCES;
}
Status = gRT->GetVariable(VariableName, VariableOwnerGuid, NULL, &Size, *Buffer);
if (Status == EFI_SUCCESS) {
*BufferSize = Size;
} else {
FreePool( *Buffer );
*Buffer = NULL;
}
return Status;
}
VOID PrintBootOption(CHAR16* BootOptionName)
{
UINTN OptionSize;
UINT8* Buffer;
EFI_STATUS Status = GetNvramVariable(BootOptionName, &gEfiGlobalVariableGuid, (VOID**)&Buffer, &OptionSize);
if (Status == EFI_SUCCESS) {
EFI_LOAD_OPTION* LoadOption = (EFI_LOAD_OPTION*) Buffer;
CHAR16* Description = (CHAR16*)(Buffer + sizeof (EFI_LOAD_OPTION));
UINTN DescriptionSize = StrSize(Description);
Print(L"%s\n", Description);
if (LoadOption->FilePathListLength != 0) {
VOID* FilePathList = (UINT8 *)Description + DescriptionSize;
CHAR16* DevPathString = ConvertDevicePathToText(FilePathList, TRUE, FALSE);
Print(L"%s\n", DevPathString);
}
} else {
Print(L"Can't get %s variable\n", BootOptionName);
}
}
INTN EFIAPI ShellAppMain(IN UINTN Argc, IN CHAR16 **Argv)
{
UINTN OptionSize;
EFI_STATUS Status;
UINT16* BootCurrent;
Status = GetNvramVariable(L"BootCurrent", &gEfiGlobalVariableGuid, (VOID**)&BootCurrent, &OptionSize);
if (Status != EFI_SUCCESS) {
Print(L"Can't get BootCurrent variable\n");
}
UINT16* BootOrderArray;
Status = GetNvramVariable(L"BootOrder", &gEfiGlobalVariableGuid, (VOID**)&BootOrderArray, &OptionSize);
if (Status == EFI_SUCCESS) {
for (UINTN i=0; i<(OptionSize/sizeof(UINT16)); i++) {
CHAR16 BootOptionStr[sizeof("Boot####")+1];
UnicodeSPrint(BootOptionStr, (sizeof("Boot####")+1)*sizeof(CHAR16), L"Boot%04x", BootOrderArray[i]);
Print(L"%s%s\n", BootOptionStr, (BootOrderArray[i] == *BootCurrent)? L"*" : L"" );
PrintBootOption(BootOptionStr);
Print(L"\n");
}
} else {
Print(L"Can't get BootOrder variable\n");
}
return EFI_SUCCESS;
}
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