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Fix bug of wrong stack16 stack for thunk call. This may cause Duet failed to enter graphic mode under Qemu simulator or some platforms.

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git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7771 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
klu2
2009-03-02 15:03:37 +00:00
parent 71bd6db178
commit 237bb9d0be
2 changed files with 21 additions and 16 deletions
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10
DuetPkg/BiosVideoThunkDxe/BiosVideo.c
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@@ -1043,6 +1043,7 @@ BiosVideoCheckForVbe (
VESA_BIOS_EXTENSIONS_VALID_EDID_TIMING ValidEdidTiming;
EFI_GRAPHICS_OUTPUT_PROTOCOL_MODE *GraphicsOutputMode;
DEBUG ((EFI_D_INFO, "Enter BiosVideoCheckForVbe()\n"));
//
// Allocate buffer under 1MB for VBE data structures
//
@@ -1095,26 +1096,33 @@ BiosVideoCheckForVbe (
Regs.X.ES = EFI_SEGMENT ((UINTN) BiosVideoPrivate->VbeInformationBlock);
Regs.X.DI = EFI_OFFSET ((UINTN) BiosVideoPrivate->VbeInformationBlock);
DEBUG ((EFI_D_INFO, "Before VESA!\n"));
LegacyBiosInt86 (BiosVideoPrivate, 0x10, &Regs);
DEBUG ((EFI_D_INFO, "Call VESA! Return Status=0x%X\n", Regs.X.AX));
DEBUG ((EFI_D_INFO, "Call VESA! VESA Signature =0x%X\n", BiosVideoPrivate->VbeInformationBlock->VESASignature));
DEBUG ((EFI_D_INFO, "Call VESA! VESA Version =0x%X\n", BiosVideoPrivate->VbeInformationBlock->VESAVersion));
Status = EFI_DEVICE_ERROR;
//
// See if the VESA call succeeded
//
if (Regs.X.AX != VESA_BIOS_EXTENSIONS_STATUS_SUCCESS) {
DEBUG ((EFI_D_INFO, "Fail to call VESA! Status=0x%X\n", Regs.X.AX));
return Status;
}
//
// Check for 'VESA' signature
//
if (BiosVideoPrivate->VbeInformationBlock->VESASignature != VESA_BIOS_EXTENSIONS_VESA_SIGNATURE) {
DEBUG ((EFI_D_INFO, "Fail to check VESA signature!\n"));
return Status;
}
//
// Check to see if this is VBE 2.0 or higher
//
if (BiosVideoPrivate->VbeInformationBlock->VESAVersion < VESA_BIOS_EXTENSIONS_VERSION_2_0) {
DEBUG ((EFI_D_INFO, "VBE version is little than 2.0!\n"));
return Status;
}