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#include <stdio.h>
#include <stdint.h>
#include <Uefi.h>
#include <Library/UefiLib.h>
#include <Library/UefiApplicationEntryPoint.h>
static int
memcmp(const void *s1, const void *s2, UINTN n)
{
const unsigned char *c1 = s1, *c2 = s2;
int d = 0;
if (!s1 && !s2)
return 0;
if (s1 && !s2)
return 1;
if (!s1 && s2)
return -1;
while (n--) {
d = (int)*c1++ - (int)*c2++;
if (d)
break;
}
return d;
}
EFI_STATUS
PrintGOP(EFI_GRAPHICS_OUTPUT_PROTOCOL *gop)
{
int i, imax;
EFI_STATUS Status;
imax = gop->Mode->MaxMode;
Print(L"GOP reports MaxMode %d\n", imax);
for (i = 0; i < imax; i++) {
EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *Info;
UINTN SizeOfInfo;
Status = gop->QueryMode(gop, i, &SizeOfInfo, &Info);
if (EFI_ERROR(Status) && Status == EFI_NOT_STARTED) {
gop->SetMode(gop, gop->Mode->Mode);
Status = gop->QueryMode(gop, i, &SizeOfInfo, &Info);
}
if (EFI_ERROR(Status)) {
Print(L"ERROR: Bad response from QueryMode: %d\n", Status);
continue;
}
Print(L"%c%d: %dx%d ", memcmp(Info,gop->Mode->Info,sizeof(*Info)) == 0 ? '*' : ' ', i,
Info->HorizontalResolution,
Info->VerticalResolution);
switch(Info->PixelFormat) {
case PixelRedGreenBlueReserved8BitPerColor:
Print(L"RGBRerserved");
break;
case PixelBlueGreenRedReserved8BitPerColor:
Print(L"BGRReserved");
break;
case PixelBitMask:
Print(L"Red:%08x Green:%08x Blue:%08x Reserved:%08x",
Info->PixelInformation.RedMask,
Info->PixelInformation.GreenMask,
Info->PixelInformation.BlueMask,
Info->PixelInformation.ReservedMask);
break;
case PixelBltOnly:
Print(L"(blt only)");
break;
default:
Print(L"(Invalid pixel format)");
break;
}
Print(L" Pixels %d\n", Info->PixelsPerScanLine);
}
Print(L"\n");
return EFI_SUCCESS;
}
EFI_STATUS
CheckGOP(BOOLEAN Verbose, IN EFI_SYSTEM_TABLE *gST, IN EFI_BOOT_SERVICES *gBS)
{
EFI_HANDLE *HandleBuffer = NULL;
UINTN HandleCount = 0;
EFI_STATUS Status = EFI_SUCCESS;
EFI_GRAPHICS_OUTPUT_PROTOCOL *Gop;
// get from ConsoleOutHandle?
Status = gBS->HandleProtocol( gST->ConsoleOutHandle,
&gEfiGraphicsOutputProtocolGuid,
(VOID **) &Gop);
if (EFI_ERROR (Status)) {
Print(L"No GOP handle found via HandleProtocol\n");
} else {
Print(L"GOP handle found via HandleProtocol\n");
if (Verbose)
PrintGOP(Gop);
}
// try locating directly
Status = gBS->LocateProtocol( &gEfiGraphicsOutputProtocolGuid,
NULL,
(VOID **) &Gop);
if (EFI_ERROR(Status) || Gop == NULL) {
Print(L"No GOP handle found via LocateProtocol\n");
} else {
Print(L"Found GOP handle via LocateProtocol\n");
if (Verbose)
PrintGOP(Gop);
}
// try locating by handle
Status = gBS->LocateHandleBuffer( ByProtocol,
&gEfiGraphicsOutputProtocolGuid,
NULL,
&HandleCount,
&HandleBuffer);
if (EFI_ERROR (Status)) {
Print(L"No GOP handles found via LocateHandleBuffer\n");
} else {
Print(L"Found %d GOP handles via LocateHandleBuffer\n", HandleCount);
for (int i = 0; i < HandleCount; i++) {
Status = gBS->HandleProtocol( HandleBuffer[i],
&gEfiGraphicsOutputProtocolGuid,
(VOID*) &Gop);
if (!EFI_ERROR (Status)) {
if (Verbose)
PrintGOP(Gop);
}
}
gBS->FreePool(HandleBuffer);
}
Print(L"\n");
return Status;
}
EFI_STATUS
EFIAPI
UefiMain (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
CheckGOP(TRUE, SystemTable, SystemTable->BootServices);
return EFI_SUCCESS;
}
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