UEFI EDK2框架学习 （四）——UEFI图形化

一、修改protocol.c

#include <Uefi.h>
#include <Library/UefiLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <stdio.h>


EFI_STATUS
EFIAPI
UefiMain(
  IN EFI_HANDLE ImageHandle,
  IN EFI_SYSTEM_TABLE *SystemTable
) {
  EFI_STATUS Status = EFI_SUCCESS;
  UINTN NoHandles = 0;
  EFI_HANDLE *Buffer = NULL;
  Status = gBS->LocateHandleBuffer(
    ByProtocol,
    &gEfiGraphicsOutputProtocolGuid,
    NULL,
    &NoHandles,
    &Buffer
  );

  Print(L"Status = %d", Status);
  if (EFI_ERROR(Status)) {
    Print(L"Failed to LocateHandleBuffer. \n");
    return Status;
  }
  Print(L"Hello, Protocol\n");

  EFI_GRAPHICS_OUTPUT_PROTOCOL *Gop;
  Status = gBS->OpenProtocol(
    Buffer[0],
    &gEfiGraphicsOutputProtocolGuid,
    (VOID**)&Gop,
    ImageHandle,
    NULL,
    EFI_OPEN_PROTOCOL_GET_PROTOCOL
  );

  Print(L"Status = %d", Status);
  if (EFI_ERROR(Status)) {
    Print(L"Failed to OpenProtocol. \n");
    return Status;
  }

  UINTN SizeOfInfo = 0;
  EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *Info;
  UINTN i = 0;

  for (; i < Gop->Mode->MaxMode; i++) {
    Status = Gop->QueryMode(Gop, i, &SizeOfInfo, &Info);

    if (EFI_ERROR(Status)) {
      Print(L"Failed to Querymode. \n");
      return Status;
    }

    PrintL(L"Mode %d, H = %d, V = %d", i, Info->HorizontalResolution, Info->VerticalResolution);
  }
  
  Status = Gop->SetMode(Gop, 22);
  if (EFI_ERROR(Status)) {
    Print(L"Failed to Querymode. \n");
    return Status;
  }

  EFI_GRAPHICS_OUTPUT_BLT_PIXEL Red = {0, 0, 255, 0};

  Gop->Blt(
    Gop,
    &Red,
    EfiBltVideoFill,
    0,0,   // source x y
    0,0,
    100,100,  // wid  height
    0
  );

  if (EFI_ERROR(Status)) {
    Print(L"Failed to Blt. \n");
    return Status;
  }


  Gop->Blt(
    Gop,
    &Red,
    EfiBltVideoFill,
    0,0,   // source x y
    200, 200,
    100,100,  // wid  height
    0
  );  // copy

    if (EFI_ERROR(Status)) {
    Print(L"Failed to Blt. \n");
    return Status;
  }
  return Status;
}

二、build