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#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiLib.h>
#include <Protocol/AcpiSystemDescriptionTable.h>
#include <Library/ShellLib.h>
#include <IndustryStandard/Bmp.h>
EFI_STATUS WriteFile(CHAR16* FileName, VOID* Data, UINTN* Size)
{
SHELL_FILE_HANDLE FileHandle;
EFI_STATUS Status = ShellOpenFileByName(
FileName,
&FileHandle,
EFI_FILE_MODE_CREATE | EFI_FILE_MODE_WRITE | EFI_FILE_MODE_READ,
0
);
if (!EFI_ERROR(Status)) {
Print(L"Save it to %s\n", FileName);
UINTN ToWrite = *Size;
Status = ShellWriteFile(
FileHandle,
Size,
Data
);
if (EFI_ERROR(Status)) {
Print(L"Can't write file: %r\n", Status);
}
if (*Size != ToWrite) {
Print(L"Error! Not all data was written\n");
}
Status = ShellCloseFile(
&FileHandle
);
if (EFI_ERROR(Status)) {
Print(L"Can't close file: %r\n", Status);
}
} else {
Print(L"Can't open file: %r\n", Status);
}
return Status;
}
EFI_STATUS
EFIAPI
UefiMain (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_ACPI_SDT_PROTOCOL* AcpiSdtProtocol;
EFI_STATUS Status = gBS->LocateProtocol (
&gEfiAcpiSdtProtocolGuid,
NULL,
(VOID**)&AcpiSdtProtocol
);
if (EFI_ERROR (Status)) {
return Status;
}
BOOLEAN BGRT_found = FALSE;
UINTN Index = 0;
EFI_ACPI_SDT_HEADER* Table;
EFI_ACPI_TABLE_VERSION Version;
UINTN TableKey;
while (TRUE) {
Status = AcpiSdtProtocol->GetAcpiTable(Index,
&Table,
&Version,
&TableKey
);
if (EFI_ERROR(Status)) {
break;
}
if (((CHAR8)((Table->Signature >> 0) & 0xFF) == 'B') &&
((CHAR8)((Table->Signature >> 8) & 0xFF) == 'G') &&
((CHAR8)((Table->Signature >> 16) & 0xFF) == 'R') &&
((CHAR8)((Table->Signature >> 24) & 0xFF) == 'T')) {
BGRT_found = TRUE;
break;
}
Index++;
}
if (!BGRT_found) {
Print(L"BGRT table is not present in the system\n");
return EFI_UNSUPPORTED;
}
EFI_ACPI_6_3_BOOT_GRAPHICS_RESOURCE_TABLE* BGRT = (EFI_ACPI_6_3_BOOT_GRAPHICS_RESOURCE_TABLE*)Table;
if (BGRT->ImageType == 0) {
BMP_IMAGE_HEADER* BMP = (BMP_IMAGE_HEADER*)(BGRT->ImageAddress);
if ((BMP->CharB != 'B') || (BMP->CharM != 'M')) {
Print(L"BMP image has wrong signature!\n");
return EFI_UNSUPPORTED;
}
Print(L"BGRT conatins BMP image with %dx%d resolution\n", BMP->PixelWidth, BMP->PixelHeight);
UINTN Size = BMP->Size;
Status = WriteFile(L"BGRT.bmp", BMP, &Size);
if (EFI_ERROR(Status)) {
Print(L"Error! Can't write BGRT.bmp file\n");
}
}
return Status;
}
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