195 lines
3.1 KiB
C
195 lines
3.1 KiB
C
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/*--
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Copyright (c) 2001 Microsoft Corporation
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Module Name:
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x86bios.c
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Abstract:
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This is the AMD64 specific part of the video port driver
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Author:
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Forrest C. Foltz (forrestf)
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Environment:
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Kernel mode only
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Notes:
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This module is a driver which implements OS dependent functions on
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behalf of the video drivers
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Revision history:
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--*/
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#include "halcmn.h"
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#include <xm86.h>
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#include <x86new.h>
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PVOID HalpIoControlBase = NULL;
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PVOID HalpIoMemoryBase = (PVOID)KSEG0_BASE;
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BOOLEAN HalpX86BiosInitialized = FALSE;
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VOID
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HalpBiosDisplayReset (
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VOID
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)
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/*++
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Routine Description:
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This function places the VGA display into 640 x 480 16 color mode
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by calling the BIOS.
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Arguments:
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None.
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Return Value:
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None.
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--*/
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{
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ULONG eax;
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ULONG exx;
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//
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// ah = function 0: reset display
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// al = mode 0x12: 640x480 16 color
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//
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eax = 0x0012;
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exx = 0;
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//
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// Simulate:
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//
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// mov ax, 0012h
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// int 10h
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//
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HalCallBios(0x10,&eax,&exx,&exx,&exx,&exx,&exx,&exx);
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}
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BOOLEAN
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HalCallBios (
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IN ULONG BiosCommand,
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IN OUT PULONG Eax,
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IN OUT PULONG Ebx,
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IN OUT PULONG Ecx,
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IN OUT PULONG Edx,
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IN OUT PULONG Esi,
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IN OUT PULONG Edi,
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IN OUT PULONG Ebp
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)
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/*++
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Routine Description:
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This function provides the platform specific interface between a device
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driver and the execution of the x86 ROM bios code for the specified ROM
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bios command.
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Arguments:
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BiosCommand - Supplies the ROM bios command to be emulated.
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Eax to Ebp - Supplies the x86 emulation context.
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Return Value:
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A value of TRUE is returned if the specified function is executed.
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Otherwise, a value of FALSE is returned.
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--*/
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{
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XM86_CONTEXT context;
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XM_STATUS status;
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if (HalpX86BiosInitialized == FALSE) {
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return FALSE;
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}
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// s
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// Copy the x86 bios context and emulate the specified command.
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//
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context.Eax = *Eax;
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context.Ebx = *Ebx;
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context.Ecx = *Ecx;
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context.Edx = *Edx;
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context.Esi = *Esi;
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context.Edi = *Edi;
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context.Ebp = *Ebp;
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status = x86BiosExecuteInterrupt((UCHAR)BiosCommand,
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&context,
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(PVOID)HalpIoControlBase,
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(PVOID)HalpIoMemoryBase);
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if (status != XM_SUCCESS) {
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return FALSE;
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}
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//
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// Copy the x86 bios context and return TRUE.
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//
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*Eax = context.Eax;
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*Ebx = context.Ebx;
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*Ecx = context.Ecx;
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*Edx = context.Edx;
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*Esi = context.Esi;
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*Edi = context.Edi;
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*Ebp = context.Ebp;
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return TRUE;
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}
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VOID
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HalpInitializeBios (
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VOID
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)
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/*++
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Routine Description:
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This routine initializes the X86 emulation module and an attached VGA
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adapter.
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Arguments:
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None.
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Return Value:
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None.
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--*/
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{
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XM_STATUS status;
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x86BiosInitializeBios(NULL, (PVOID)KSEG0_BASE);
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status = x86BiosInitializeAdapter(0xc0000,NULL,NULL,NULL);
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if (status != XM_SUCCESS) {
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return;
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}
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HalpX86BiosInitialized = TRUE;
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}
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