OcConsoleControlEntryModeLib.c

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#include <Uefi.h>
 
#include <Protocol/ConsoleControl.h>
 
#include <Library/PcdLib.h>
#include <Library/UefiBootServicesTableLib.h>
 
EFI_STATUS
EFIAPI
OcConsoleControlEntryModeConstructor (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_STATUS                    Status;
  EFI_CONSOLE_CONTROL_PROTOCOL  *ConsoleControl;
 
  if (FixedPcdGet8 (PcdConsoleControlEntryMode) < EfiConsoleControlScreenMaxValue) {
    //
    // On several types of firmware, we need to use legacy console control protocol to
    // switch to text mode, otherwise a black screen will be shown.
    //
    Status = gBS->HandleProtocol (
                    gST->ConsoleOutHandle,
                    &gEfiConsoleControlProtocolGuid,
                    (VOID **)&ConsoleControl
                    );
    if (EFI_ERROR (Status)) {
      Status = gBS->LocateProtocol (
                      &gEfiConsoleControlProtocolGuid,
                      NULL,
                      (VOID **)&ConsoleControl
                      );
    }
 
    if (!EFI_ERROR (Status)) {
      ConsoleControl->SetMode (
                        ConsoleControl,
                        FixedPcdGet8 (PcdConsoleControlEntryMode)
                        );
    }
  }
 
  return EFI_SUCCESS;
}