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#include <efi.h>
#include <efilib.h>
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;
}
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