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Discover and set the best video mode supported by the UEFI graphics driver

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This commit is contained in:
Justin C. Miller
2017-01-03 08:03:07 -08:00
parent e87609ac6d
commit dba1ca186d
2 changed files with 45 additions and 5 deletions
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45
src/arch/x86_64/main.c
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@@ -12,11 +12,46 @@ efi_main (EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable)
InitializeLib(ImageHandle, SystemTable);
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdiscarded-qualifiers"
status = ST->ConOut->OutputString(ST->ConOut, L"Hello from UEFI\n\r");
#pragma GCC diagnostic pop
check_status(status, L"OutputString");
Print(L"Popcorn OS " GIT_VERSION L" booting...\n");
Print(L"Setting console display mode... ");
EFI_GRAPHICS_OUTPUT_PROTOCOL *gfx_out_proto;
EFI_GUID gfx_out_guid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
status = SystemTable->BootServices->LocateProtocol(&gfx_out_guid, NULL, (void**)&gfx_out_proto);
check_status(status, "LocateProtocol gfx");
const uint32_t modes = gfx_out_proto->Mode->MaxMode;
uint32_t res =
gfx_out_proto->Mode->Info->HorizontalResolution *
gfx_out_proto->Mode->Info->VerticalResolution;
uint32_t best = (uint32_t)-1;
for (uint32_t i = 0; i < modes; ++i) {
UINTN size = 0;
EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *info = NULL;
status = gfx_out_proto->QueryMode(gfx_out_proto, i, &size, &info);
check_status(status, "QueryMode");
const uint32_t new_res =
info->HorizontalResolution *
info->VerticalResolution;
if (new_res > res) {
best = i;
res = new_res;
}
}
if (best != (uint32_t)-1) {
status = gfx_out_proto->SetMode(gfx_out_proto, best);
check_status(status, "SetMode");
Print(L"*");
}
Print(L"%ux%u\n",
gfx_out_proto->Mode->Info->HorizontalResolution,
gfx_out_proto->Mode->Info->VerticalResolution);
Print(L" SystemTable: %x\n", SystemTable);
if (SystemTable)