Function ResetNativeNvram

rEFIt_UEFI/Platform/Nvram.cpp:333–424

Reset Native NVRAM by vit9696, reworked and implemented by Sherlocks

// Reset Native NVRAM by vit9696, reworked and implemented by Sherlocks
EFI_STATUS
ResetNativeNvram ()
{
  EFI_STATUS      Status = EFI_NOT_FOUND;
  EFI_GUID        Guid;
  CHAR16          *Name;
  UINTN           NameSize;
  UINTN           NewNameSize;
  BOOLEAN         Restart = TRUE;
  UINTN           VolumeIndex;
  REFIT_VOLUME    *Volume;
  EFI_FILE_HANDLE FileHandle;

  //DbgHeader("ResetNativeNvram: cleanup NVRAM variables");

  NameSize = sizeof (CHAR16);
  Name = (__typeof__(Name))AllocateZeroPool(NameSize);
  if (Name == NULL) {
    return Status;
  }
    
  while (TRUE) {
    if (Restart) {
      ZeroMem (&Guid, sizeof(Guid));
      ZeroMem (Name, sizeof(Name));
      Restart = FALSE;
    }
      
    NewNameSize = NameSize;
    Status = gRT->GetNextVariableName (&NewNameSize, Name, &Guid);
    if (Status == EFI_BUFFER_TOO_SMALL) {
      Name = (__typeof__(Name))ReallocatePool (NameSize, NewNameSize, Name);
      if (Name == NULL) {
        return Status;
      }

      Status = gRT->GetNextVariableName (&NewNameSize, Name, &Guid);
      NameSize = NewNameSize;
    }

    if (EFI_ERROR(Status)) {
      break;
    }

    if (!EFI_ERROR(Status)) {
      if (IsDeletableVariable (Name, &Guid)) {
        //DBG("Deleting %s:%ls...", strguid(&Guid), Name);
        Status = DeleteNvramVariable(Name, &Guid);
        if (!EFI_ERROR(Status)) {
          //DBG("OK\n");
          Restart = TRUE;
        } else {
          //DBG("FAIL (%s)\n", efiStrError(Status));
          break;
        }
      }
    }
  }