/* $NetBSD: bltgrid.c,v 1.1.1.2 2021/09/30 18:50:09 jmcneill Exp $ */ #include #include extern EFI_GUID GraphicsOutputProtocol; static void fill_boxes(UINT32 *PixelBuffer, UINT32 Width, UINT32 Height) { UINT32 y, x = 0; /* * This assums BGRR, but it doesn't really matter; we pick red and * green so it'll just be blue/green if the pixel format is backwards. */ EFI_GRAPHICS_OUTPUT_BLT_PIXEL Red = {0, 0, 0xff, 0}, Green = {0, 0xff, 0, 0}, *Color; for (y = 0; y < Height; y++) { Color = ((y / 32) % 2 == 0) ? &Red : &Green; for (x = 0; x < Width; x++) { if (x % 32 == 0 && x != 0) Color = (Color == &Red) ? &Green : &Red; PixelBuffer[y * Width + x] = *(UINT32 *)Color; } } } static void draw_boxes(EFI_GRAPHICS_OUTPUT_PROTOCOL *gop) { int i, imax; EFI_STATUS rc; EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *info; UINTN NumPixels; UINT32 *PixelBuffer; UINT32 BufferSize; if (gop->Mode) { imax = gop->Mode->MaxMode; } else { Print(L"gop->Mode is NULL\n"); return; } for (i = 0; i < imax; i++) { UINTN SizeOfInfo; rc = uefi_call_wrapper(gop->QueryMode, 4, gop, i, &SizeOfInfo, &info); if (rc == EFI_NOT_STARTED) { Print(L"gop->QueryMode() returned %r\n", rc); Print(L"Trying to start GOP with SetMode().\n"); rc = uefi_call_wrapper(gop->SetMode, 2, gop, gop->Mode ? gop->Mode->Mode : 0); rc = uefi_call_wrapper(gop->QueryMode, 4, gop, i, &SizeOfInfo, &info); } if (EFI_ERROR(rc)) { Print(L"%d: Bad response from QueryMode: %r (%d)\n", i, rc, rc); continue; } if (CompareMem(info, gop->Mode->Info, sizeof (*info))) continue; NumPixels = info->VerticalResolution * info->HorizontalResolution; BufferSize = NumPixels * sizeof(UINT32); PixelBuffer = AllocatePool(BufferSize); if (!PixelBuffer) { Print(L"Allocation of 0x%08lx bytes failed.\n", sizeof(UINT32) * NumPixels); return; } fill_boxes(PixelBuffer, info->HorizontalResolution, info->VerticalResolution); uefi_call_wrapper(gop->Blt, 10, gop, (EFI_GRAPHICS_OUTPUT_BLT_PIXEL *)PixelBuffer, EfiBltBufferToVideo, 0, 0, 0, 0, info->HorizontalResolution, info->VerticalResolution, 0); FreePool(PixelBuffer); return; } Print(L"Never found the active video mode?\n"); } static EFI_STATUS SetWatchdog(UINTN seconds) { EFI_STATUS rc; rc = uefi_call_wrapper(BS->SetWatchdogTimer, 4, seconds, 0x1ffff, 0, NULL); if (EFI_ERROR(rc)) { CHAR16 Buffer[64]; StatusToString(Buffer, rc); Print(L"Bad response from QueryMode: %s (%d)\n", Buffer, rc); } return rc; } EFI_STATUS efi_main (EFI_HANDLE image_handle, EFI_SYSTEM_TABLE *systab) { EFI_STATUS rc; EFI_GRAPHICS_OUTPUT_PROTOCOL *gop; InitializeLib(image_handle, systab); SetWatchdog(10); rc = LibLocateProtocol(&GraphicsOutputProtocol, (void **)&gop); if (EFI_ERROR(rc)) { Print(L"Could not locate GOP: %r\n", rc); return rc; } if (!gop) { Print(L"LocateProtocol(GOP, &gop) returned %r but GOP is NULL\n", rc); return EFI_UNSUPPORTED; } draw_boxes(gop); SetWatchdog(0); return EFI_SUCCESS; }