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#include <lib.h>
#include <efi.h>
#include <comus/efi.h>
static EFI_GRAPHICS_OUTPUT_PROTOCOL *gop = NULL;
EFI_STATUS efi_load_gop(EFI_SYSTEM_TABLE *ST)
{
EFI_STATUS status = EFI_SUCCESS;
EFI_GUID gopGuid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *info;
UINTN SizeOfInfo, numModes, nativeMode;
status = ST->BootServices->LocateProtocol(&gopGuid, NULL, (void **)&gop);
if (EFI_ERROR(status))
return status;
status = gop->QueryMode(gop, gop->Mode == NULL ? 0 : gop->Mode->Mode,
&SizeOfInfo, &info);
if (status == EFI_NOT_STARTED)
status = gop->SetMode(gop, 0);
if (EFI_ERROR(status))
return status;
nativeMode = gop->Mode->Mode;
numModes = gop->Mode->MaxMode;
// find the best mode
UINTN best = nativeMode;
UINTN width = 0;
for (UINTN i = 0; i < numModes; i++) {
status = gop->QueryMode(gop, i, &SizeOfInfo, &info);
if (info->PixelFormat != PixelBlueGreenRedReserved8BitPerColor &&
info->PixelFormat != PixelRedGreenBlueReserved8BitPerColor)
continue;
if (info->HorizontalResolution > width) {
width = info->HorizontalResolution;
best = i;
}
}
gop->SetMode(gop, best);
if (EFI_ERROR(status))
return status;
return status;
}
EFI_GRAPHICS_OUTPUT_PROTOCOL *efi_get_gop(void)
{
return gop;
}
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