#include <IndustryStandard/LegacyVgaBios.h>
#include <Library/DebugLib.h>
#include <Library/PciLib.h>
#include <Library/PrintLib.h>
#include "Gop.h"
#include "VbeShim.h"

Data Structures
struct	IVT_ENTRY

Macros
#define	NUM_VBE_MODES 3

#define	VBE_MODE_ENABLED 0x00BB

#define	VBE_MODE_DISABLED 0x00BA

Functions
VOID	InstallVbeShim (IN CONST CHAR16 *CardName, IN EFI_PHYSICAL_ADDRESS FrameBufferBase)

Variables
STATIC CONST CHAR8	mProductRevision [] = "2.0"

STATIC CONST UINT16	vbeModeIds []

STATIC VBE2_MODE_INFO	vbeModes []

Detailed Description

Install a fake VGABIOS service handler (real mode Int10h) for the buggy Windows 2008 R2 SP1 UEFI guest.

The handler is never meant to be directly executed by a VCPU; it's there for the internal real mode emulator of Windows 2008 R2 SP1.

The code is based on Ralf Brown's Interrupt List: http://www.cs.cmu.edu/~ralf/files.html http://www.ctyme.com/rbrown.htm

Copyright (C) 2020, Rebecca Cran rebec.nosp@m.ca@b.nosp@m.sdio..nosp@m.com Copyright (C) 2015, Nahanni Systems, Inc. Copyright (C) 2014, Red Hat, Inc. Copyright (c) 2013 - 2014, Intel Corporation. All rights reserved.

SPDX-License-Identifier: BSD-2-Clause-Patent

Definition in file VbeShim.c.

Macro Definition Documentation

◆ NUM_VBE_MODES

#define NUM_VBE_MODES 3

Definition at line 42 of file VbeShim.c.

◆ VBE_MODE_DISABLED

#define VBE_MODE_DISABLED 0x00BA

Definition at line 51 of file VbeShim.c.

◆ VBE_MODE_ENABLED

#define VBE_MODE_ENABLED 0x00BB

Definition at line 50 of file VbeShim.c.

Function Documentation

◆ InstallVbeShim()

VOID InstallVbeShim	(	IN CONST CHAR16 *	CardName,
		IN EFI_PHYSICAL_ADDRESS	FrameBufferBase
	)

Install the VBE Info and VBE Mode Info structures, and the VBE service handler routine in the C segment. Point the real-mode Int10h interrupt vector to the handler. The only advertised mode is 1024x768x32.

Parameters

[in]	CardName	Name of the video card to be exposed in the Product Name field of the VBE Info structure.
[in]	FrameBufferBase	Guest-physical base address of the video card's frame buffer.

Definition at line 97 of file VbeShim.c.

Variable Documentation

◆ mProductRevision

STATIC CONST CHAR8 mProductRevision[] = "2.0"

Definition at line 40 of file VbeShim.c.

◆ vbeModeIds

STATIC CONST UINT16 vbeModeIds[]

Initial value:

= {
  0x13f,  
  0x140,  
  0x141   
}

Definition at line 43 of file VbeShim.c.

◆ vbeModes

STATIC VBE2_MODE_INFO vbeModes[]

Definition at line 53 of file VbeShim.c.

Data Structures

Macros

Functions

Variables