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239 lines
4.0 KiB
239 lines
4.0 KiB
/*++
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Copyright (c) 1994 Microsoft Corporation
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Module Name:
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x86bios.c
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Abstract:
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This module implements the platform specific interface between a device
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driver and the execution of x86 ROM bios code for the device.
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Author:
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David N. Cutler (davec) 17-Jun-1994
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Environment:
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Kernel mode only.
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Revision History:
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--*/
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#include "halp.h"
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//
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// Define global data.
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//
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ULONG HalpX86BiosInitialized = FALSE;
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ULONG HalpEnableInt10Calls = FALSE;
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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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#if defined(USE_BIOS_EMULATOR)
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XM86_CONTEXT Context;
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//
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// If the x86 BIOS Emulator has not been initialized, then return FALSE.
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//
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if (HalpX86BiosInitialized == FALSE) {
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return FALSE;
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}
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//
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// If the Video Adapter initialization failed and an Int10 command is
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// specified, then return FALSE.
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//
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if ((BiosCommand == 0x10) && (HalpEnableInt10Calls == FALSE)) {
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return FALSE;
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}
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//
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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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if (x86BiosExecuteInterrupt((UCHAR)BiosCommand, &Context) != 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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#else
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return FALSE;
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#endif
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}
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VOID
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HalpInitializeX86DisplayAdapter(
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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 initializes a display adapter using the x86 bios emulator.
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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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#if defined(USE_BIOS_EMULATOR)
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//
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// If EISA I/O Ports or EISA memory could not be mapped, then don't
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// attempt to initialize the display adapter.
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//
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if (HalpEisaControlBase == NULL || HalpEisaMemoryBase == NULL) {
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return;
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}
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//
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// Initialize the x86 bios emulator.
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//
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x86BiosInitializeBios((ULONG)HalpEisaControlBase, (ULONG)HalpEisaMemoryBase);
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HalpX86BiosInitialized = TRUE;
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//
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// Attempt to initialize the display adapter by executing its ROM bios
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// code. The standard ROM bios code address for PC video adapters is
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// 0xC000:0000 on the ISA bus.
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//
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if (x86BiosInitializeAdapter(0xc0000) != XM_SUCCESS) {
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HalpEnableInt10Calls = FALSE;
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return;
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}
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HalpEnableInt10Calls = TRUE;
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#endif
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return;
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}
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VOID
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HalpResetX86DisplayAdapter(
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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 resets a display adapter using the x86 bios emulator.
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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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#if defined(USE_BIOS_EMULATOR)
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XM86_CONTEXT Context;
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//
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// Initialize the x86 bios context and make the INT 10 call to initialize
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// the display adapter to 80x25 color text mode.
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//
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Context.Eax = 0x0003; // Function 0, Mode 3
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Context.Ebx = 0;
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Context.Ecx = 0;
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Context.Edx = 0;
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Context.Esi = 0;
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Context.Edi = 0;
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Context.Ebp = 0;
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HalCallBios(0x10,
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&Context.Eax,
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&Context.Ebx,
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&Context.Ecx,
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&Context.Edx,
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&Context.Esi,
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&Context.Edi,
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&Context.Ebp);
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#endif
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return;
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}
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