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windows-nt-4.0/private/ntos/nthals/haleagle/ppc/x86bios.c

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/*++
Copyright (c) 1994 Microsoft Corporation
Module Name:
x86bios.c
Abstract:
This module implements the platform specific interface between a device
driver and the execution of x86 ROM bios code for the device.
Author:
David N. Cutler (davec) 17-Jun-1994
Environment:
Kernel mode only.
Revision History:
9/26/95 Steve Johns - Motorola
- Don't scan last PCI slot if PowerStack
- Don't execute PCI ROM if BaseClass indicates not video
3/29/96 Scott Geranen - Motorola
- call PCI BIOS with bus/dev/func arguments
--*/
#define USE_BIOS_EMULATOR
#include "halp.h"
#include "xm86.h"
#include "x86new.h"
#include "pxpcisup.h"
#include "pxsystyp.h"
#include "pci.h"
extern ULONG HalpPciMaxSlots;
extern ULONG HalpPciConfigSize;
//
// Define global data.
//
ULONG HalpX86BiosInitialized = FALSE;
ULONG HalpEnableInt10Calls = FALSE;
PVOID HalpIoMemoryBase = NULL;
PUCHAR HalpRomBase = NULL;
UCHAR HalpVideoBus; // Used as arguments to the PCI BIOS
UCHAR HalpVideoDevice; // init function. Set HalpInitX86Emulator,
UCHAR HalpVideoFunction; // used by HalpInitializeX86DisplayAdapter.
UCHAR HalpLastPciBus; // Set by scanning the configuration data and
// used by PCI BIOS eumulation code.
//
// The MPC105 and the IBM27-82660 map the device number to the AD
// line differently. This value is used to compensate for the
// difference. Any HAL #including this file should set this value
// appropriately. Note that this value is subtracted from the
// computed AD line.
//
#ifndef PCI_DEVICE_NUMBER_OFFSET
#define PCI_DEVICE_NUMBER_OFFSET 0 // default value for eagle
#endif
ULONG ROM_Length;
#define BUFFER_SIZE (64*1024)
UCHAR ROM_Buffer[BUFFER_SIZE];
BOOLEAN HalpInitX86Emulator(
VOID)
{
ULONG ROM_size = 0;
PHYSICAL_ADDRESS PhysAddr;
USHORT Cmd, VendorID;
ULONG Slot, EndSlot;
PVOID HalpVideoConfigBase;
PUCHAR ROM_Ptr, ROM_Shadow;
ULONG i;
UCHAR BaseClass;
PhysAddr.HighPart = 0x00000000;
EndSlot = HalpPciMaxSlots;
if (HalpSystemType == MOTOROLA_POWERSTACK)
EndSlot--;
//
// Scan PCI slots for video BIOS ROMs, except 2 PCI "slots" on motherboard
//
for (Slot = 2; Slot < EndSlot; Slot++) {
//
// Create a mapping to PCI configuration space
//
if( HalpPciConfigBase == NULL) {
HalpPciConfigBase = KePhase0MapIo(PCI_CONFIG_PHYSICAL_BASE, HalpPciConfigSize);
if (HalpPciConfigBase == NULL) {
DbgPrint("\nCan't create mapping to PCI Configuration Space\n");
return FALSE;
}
}
HalpVideoConfigBase = (PVOID) ((ULONG) HalpPciConfigBase + HalpPciConfigSlot[Slot]);
//
// Read Vendor ID and check if slot is empty
//
VendorID = READ_REGISTER_USHORT(&((PCI_CONFIG)HalpVideoConfigBase)->VendorID);
if (VendorID == 0xFFFF)
continue; // Slot is empty; go to next slot
//
// If Base Class does not indicate video, go to next slot
//
BaseClass = READ_REGISTER_UCHAR(&((PCI_CONFIG)HalpVideoConfigBase)->ClassCode[2]);
if (BaseClass != 0 && BaseClass != 3)
continue;
//
// Get size of ROM
//
WRITE_REGISTER_ULONG(&((PCI_CONFIG)HalpVideoConfigBase)->ROMbase, 0xFFFFFFFF);
ROM_size = READ_REGISTER_ULONG(&((PCI_CONFIG)HalpVideoConfigBase)->ROMbase);
if ((ROM_size != 0xFFFFFFFF) && (ROM_size != 0)) {
ROM_size = 0xD0000; // Map to end of option ROM space
//
// Set Expansion ROM Base Address & enable ROM
//
PhysAddr.LowPart = 0x000C0000 | 1;
WRITE_REGISTER_ULONG(&((PCI_CONFIG)HalpVideoConfigBase)->ROMbase, PhysAddr.LowPart);
//
// Enable Memory & I/O spaces in command register
//
Cmd = READ_REGISTER_USHORT(&((PCI_CONFIG)HalpVideoConfigBase)->Command);
WRITE_REGISTER_USHORT(&((PCI_CONFIG)HalpVideoConfigBase)->Command, Cmd | 3);
//
// Delete the mapping to PCI config space
//
HalpPciConfigBase = HalpVideoConfigBase = NULL;
KePhase0DeleteIoMap( PCI_CONFIG_PHYSICAL_BASE, HalpPciConfigSize);
//
// Create a mapping to the PCI memory space
//
HalpIoMemoryBase = KePhase0MapIo(PCI_MEMORY_BASE, ROM_size);
if (HalpIoMemoryBase == NULL) {
DbgPrint("\nCan't create mapping to PCI memory space\n");
return FALSE;
}
//
// Look for PCI option video ROM signature
//
HalpRomBase = ROM_Ptr = (PUCHAR) HalpIoMemoryBase + 0xC0000;
if (*ROM_Ptr == 0x55 && *(ROM_Ptr+1) == 0xAA) {
//
// Copy ROM to RAM. PCI Spec says you can't execute from ROM.
// Sometimes option ROM and video RAM can't co-exist.
//
ROM_Length = *(ROM_Ptr+2) << 9;
if (ROM_Length <= BUFFER_SIZE) {
for (i=0; i<ROM_Length; i++)
ROM_Buffer[i] = *ROM_Ptr++;
HalpRomBase = (PUCHAR) ROM_Buffer;
}
//
// Setup the PCI location for calling the BIOS init code.
// "Slot" needs to be translated into the device number
// suitable for CF8/CFC config accesses. In this case,
// if bit 11 set, dev = 11, etc.
//
HalpVideoBus = 0;
HalpVideoFunction = 0;
i = HalpPciConfigSlot[Slot] >> 1;
HalpVideoDevice = 0;
while (i) {
HalpVideoDevice++;
i >>= 1;
}
HalpVideoDevice -= PCI_DEVICE_NUMBER_OFFSET;
return TRUE; // Exit slot scan after finding 1st option ROM
}
//
// Delete mapping to PCI memory space
//
HalpIoMemoryBase = NULL;
KePhase0DeleteIoMap(PCI_MEMORY_BASE, HalpPciConfigSize);
//
// Restore PCI command register
//
HalpPciConfigBase = KePhase0MapIo(PCI_CONFIG_PHYSICAL_BASE, HalpPciConfigSize);
if (HalpPciConfigBase == NULL) {
DbgPrint("\nCan't create mapping to PCI Configuration Space\n");
return FALSE;
}
HalpVideoConfigBase = (PVOID) ((ULONG) HalpPciConfigBase + HalpPciConfigSlot[Slot]);
WRITE_REGISTER_USHORT(&((PCI_CONFIG)HalpVideoConfigBase)->Command, Cmd);
} // end of if clause
} // end of for loop
//
// Delete mapping to PCI config space
//
if (HalpPciConfigBase) {
HalpPciConfigBase = NULL;
KePhase0DeleteIoMap(PCI_CONFIG_PHYSICAL_BASE, HalpPciConfigSize);
}
//
// Create a mapping to ISA memory space, unless one already exists
//
if (HalpIoMemoryBase == NULL) {
HalpIoMemoryBase = KePhase0MapIo(PCI_MEMORY_BASE, ROM_size);
}
if (HalpIoMemoryBase == NULL) {
return FALSE;
} else {
//
// Look for ISA option video ROM signature
//
ROM_Ptr = (PUCHAR) HalpIoMemoryBase + 0xC0000;
HalpRomBase = ROM_Ptr;
if (*ROM_Ptr == 0x55 && *(ROM_Ptr+1) == 0xAA) {
//
// Copy ROM to RAM. PCI Spec says you can't execute from ROM.
// ROM and video RAM sometimes can't co-exist.
//
ROM_Length = *(ROM_Ptr+2) << 9;
if (ROM_Length <= BUFFER_SIZE) {
for (i=0; i<ROM_Length; i++)
ROM_Buffer[i] = *ROM_Ptr++;
HalpRomBase = (PUCHAR) ROM_Buffer;
}
return TRUE;
}
//
// No video option ROM was found. Delete mapping to PCI memory space.
//
KePhase0DeleteIoMap(PCI_MEMORY_BASE, ROM_size);
return FALSE;
}
}
BOOLEAN
HalCallBios (
IN ULONG BiosCommand,
IN OUT PULONG Eax,
IN OUT PULONG Ebx,
IN OUT PULONG Ecx,
IN OUT PULONG Edx,
IN OUT PULONG Esi,
IN OUT PULONG Edi,
IN OUT PULONG Ebp
)
/*++
Routine Description:
This function provides the platform specific interface between a device
driver and the execution of the x86 ROM bios code for the specified ROM
bios command.
Arguments:
BiosCommand - Supplies the ROM bios command to be emulated.
Eax to Ebp - Supplies the x86 emulation context.
Return Value:
A value of TRUE is returned if the specified function is executed.
Otherwise, a value of FALSE is returned.
--*/
{
#if defined(USE_BIOS_EMULATOR)
XM86_CONTEXT Context;
//
// If the x86 BIOS Emulator has not been initialized, then return FALSE.
//
if (HalpX86BiosInitialized == FALSE) {
return FALSE;
}
//
// If the Video Adapter initialization failed and an Int10 command is
// specified, then return FALSE.
//
if ((BiosCommand == 0x10) && (HalpEnableInt10Calls == FALSE)) {
return FALSE;
}
//
// Copy the x86 bios context and emulate the specified command.
//
Context.Eax = *Eax;
Context.Ebx = *Ebx;
Context.Ecx = *Ecx;
Context.Edx = *Edx;
Context.Esi = *Esi;
Context.Edi = *Edi;
Context.Ebp = *Ebp;
if (x86BiosExecuteInterrupt((UCHAR)BiosCommand,
&Context,
HalpIoControlBase,
HalpIoMemoryBase) != XM_SUCCESS) {
return FALSE;
}
//
// Copy the x86 bios context and return TRUE.
//
*Eax = Context.Eax;
*Ebx = Context.Ebx;
*Ecx = Context.Ecx;
*Edx = Context.Edx;
*Esi = Context.Esi;
*Edi = Context.Edi;
*Ebp = Context.Ebp;
return TRUE;
#else
return FALSE;
#endif
}
BOOLEAN
HalpInitializeX86DisplayAdapter(
IN PLOADER_PARAMETER_BLOCK LoaderBlock
)
/*++
Routine Description:
This function initializes a display adapter using the x86 bios emulator.
Arguments:
LoaderBlock for access to the number of PCI buses
Return Value:
None.
--*/
{
#if defined(USE_BIOS_EMULATOR)
PCONFIGURATION_COMPONENT_DATA ConfigurationEntry;
PPCI_REGISTRY_INFO PCIRegInfo;
ULONG MatchKey;
PCM_PARTIAL_RESOURCE_LIST Descriptor;
PCM_PARTIAL_RESOURCE_DESCRIPTOR Partial;
XM86_CONTEXT State;
//
// If EISA I/O Ports or EISA memory could not be mapped, then don't
// attempt to initialize the display adapter.
//
if (!HalpInitX86Emulator())
return FALSE;
if (HalpIoControlBase == NULL || HalpIoMemoryBase == NULL) {
return FALSE;
}
//
// Get the number of PCI buses for the PCI BIOS functions
//
//
// Find the PCI info in the config data.
//
HalpLastPciBus = 0;
MatchKey = 0;
while ((ConfigurationEntry=KeFindConfigurationEntry(LoaderBlock->ConfigurationRoot,
AdapterClass, MultiFunctionAdapter, &MatchKey)) != NULL) {
if (!strcmp(ConfigurationEntry->ComponentEntry.Identifier,"PCI")) {
Descriptor = (PCM_PARTIAL_RESOURCE_LIST)ConfigurationEntry->ConfigurationData;
PCIRegInfo = (PPCI_REGISTRY_INFO)&Descriptor->PartialDescriptors[1];
HalpLastPciBus = PCIRegInfo->NoBuses - 1;
break;
}
MatchKey++;
}
//
// Initialize the x86 bios emulator.
//
x86BiosInitializeBios(HalpIoControlBase, HalpIoMemoryBase);
HalpX86BiosInitialized = TRUE;
//
// Attempt to initialize the display adapter by executing its ROM bios
// code. The standard ROM bios code address for PC video adapters is
// 0xC000:0000 on the ISA bus.
//
State.Eax = (HalpVideoBus << 8) |
(HalpVideoDevice << 3) |
HalpVideoFunction;
State.Ecx = 0;
State.Edx = 0;
State.Ebx = 0;
State.Ebp = 0;
State.Esi = 0;
State.Edi = 0;
if (x86BiosInitializeAdapter(0xc0000, &State, HalpIoControlBase, HalpIoMemoryBase) != XM_SUCCESS) {
HalpEnableInt10Calls = FALSE;
return FALSE;
}
HalpEnableInt10Calls = TRUE;
#endif
return TRUE;
}
VOID
HalpResetX86DisplayAdapter(
VOID
)
/*++
Routine Description:
This function resets a display adapter using the x86 bios emulator.
Arguments:
None.
Return Value:
None.
--*/
{
#if defined(USE_BIOS_EMULATOR)
XM86_CONTEXT Context;
//
// Initialize the x86 bios context and make the INT 10 call to initialize
// the display adapter to 80x25 color text mode.
//
Context.Eax = 0x0003; // Function 0, Mode 3
Context.Ebx = 0;
Context.Ecx = 0;
Context.Edx = 0;
Context.Esi = 0;
Context.Edi = 0;
Context.Ebp = 0;
HalCallBios(0x10,
&Context.Eax,
&Context.Ebx,
&Context.Ecx,
&Context.Edx,
&Context.Esi,
&Context.Edi,
&Context.Ebp);
#endif
return;
}
//
// This code came from ..\..\x86new\x86bios.c
//
#define LOW_MEMORY_SIZE 0x800
extern UCHAR x86BiosLowMemory[LOW_MEMORY_SIZE + 3];
extern ULONG x86BiosScratchMemory;
extern ULONG x86BiosIoMemory;
extern ULONG x86BiosIoSpace;
PVOID
x86BiosTranslateAddress (
IN USHORT Segment,
IN USHORT Offset
)
/*++
Routine Description:
This translates a segment/offset address into a memory address.
Arguments:
Segment - Supplies the segment register value.
Offset - Supplies the offset within segment.
Return Value:
The memory address of the translated segment/offset pair is
returned as the function value.
--*/
{
ULONG Value;
//
// Compute the logical memory address and case on high hex digit of
// the resultant address.
//
Value = Offset + (Segment << 4);
Offset = (USHORT)(Value & 0xffff);
Value &= 0xf0000;
switch ((Value >> 16) & 0xf) {
//
// Interrupt vector/stack space.
//
case 0x0:
if (Offset > LOW_MEMORY_SIZE) {
x86BiosScratchMemory = 0;
return (PVOID)&x86BiosScratchMemory;
} else {
return (PVOID)(&x86BiosLowMemory[0] + Offset);
}
//
// The memory range from 0x10000 to 0x9ffff reads as zero
// and writes are ignored.
//
case 0x1:
case 0x2:
case 0x3:
case 0x4:
case 0x5:
case 0x6:
case 0x7:
case 0x8:
case 0x9:
x86BiosScratchMemory = 0;
return (PVOID)&x86BiosScratchMemory;
//
// The memory range from 0xa0000 to 0xdffff maps to I/O memory.
//
case 0xa:
case 0xb:
return (PVOID)(x86BiosIoMemory + Offset + Value);
case 0xc:
case 0xd:
return (PVOID)(HalpRomBase + Offset);
//
// The memory range from 0x10000 to 0x9ffff reads as zero
// and writes are ignored.
//
case 0xe:
case 0xf:
x86BiosScratchMemory = 0;
return (PVOID)&x86BiosScratchMemory;
}
// NOT REACHED - NOT EXECUTED - Prevents Compiler Warning.
return (PVOID)NULL;
}
VOID HalpCopyROMs(VOID)
{
ULONG i;
PUCHAR ROM_Shadow;
if (ROM_Buffer[0] == 0x55 && ROM_Buffer[1] == 0xAA) {
HalpRomBase = ROM_Shadow = ExAllocatePool(NonPagedPool, ROM_Length);
for (i=0; i<ROM_Length; i++) {
*ROM_Shadow++ = ROM_Buffer[i];
}
}
}
/****Include File x86new\x86bios.c Here - except the routine x86BiosTranslateAddress. ****/
/*++
Copyright (c) 1994 Microsoft Corporation
Module Name:
x86bios.c
Abstract:
This module implements supplies the HAL interface to the 386/486
real mode emulator for the purpose of emulating BIOS calls..
Author:
David N. Cutler (davec) 13-Nov-1994
Environment:
Kernel mode only.
Revision History:
--*/
#include "nthal.h"
#include "hal.h"
#include "xm86.h"
#include "x86new.h"
//
// Define the size of low memory.
//
#define LOW_MEMORY_SIZE 0x800
//
// Define storage for low emulated memory.
//
UCHAR x86BiosLowMemory[LOW_MEMORY_SIZE + 3];
ULONG x86BiosScratchMemory;
//
// Define storage to capture the base address of I/O space and the
// base address of I/O memory space.
//
ULONG x86BiosIoMemory;
ULONG x86BiosIoSpace;
//
// Define BIOS initialized state.
//
BOOLEAN x86BiosInitialized = FALSE;
//
// Hardware Configuration Mechanism #1 emulation.
//
// The eagle does not distinguish between CF8 and CFC on reads.
// At least one BIOS we know of writes/reads CF8 to see if HW
// mechanism 1 is implemented.
//
ULONG x86CF8Shadow;
//
// Hardware Configuration Mechanism #2 emulation.
//
static struct {
UCHAR CSE;
UCHAR Forward;
} x86ConfigMechanism2 = { 0, 0};
ULONG
x86BiosReadIoSpace (
IN XM_OPERATION_DATATYPE DataType,
IN USHORT PortNumber
)
/*++
Routine Description:
This function reads from emulated I/O space.
Arguments:
DataType - Supplies the datatype for the read operation.
PortNumber - Supplies the port number in I/O space to read from.
Return Value:
The value read from I/O space is returned as the function value.
N.B. If an aligned operation is specified, then the individual
bytes are read from the specified port one at a time and
assembled into the specified datatype.
--*/
{
ULONG Result;
union {
PUCHAR Byte;
PUSHORT Word;
PULONG Long;
} u;
//
// Convert mechanism #2 config accesses to mechanism #1.
//
if (((PortNumber & 0xF000) == 0xC000) &&
((x86ConfigMechanism2.CSE & 0xF0) != 0)) {
WRITE_REGISTER_ULONG(x86BiosIoSpace + 0xCF8,
(1 << 31) | // Enable
(x86ConfigMechanism2.Forward << 16) | // Bus
((((PortNumber & 0x0F00) >> 8) + 11) << 11) | // Dev
(((x86ConfigMechanism2.CSE & 0x0E) >> 1) << 8) | // Function
(PortNumber & 0x00FC) // Register
);
PortNumber = 0xCFC + (PortNumber & 3); // convert to config data port
// and let code below do the rest
}
//
// Compute port address and read port.
//
u.Long = (PULONG)(x86BiosIoSpace + PortNumber);
if (DataType == BYTE_DATA) {
//
// Emulate config mechanism #2
//
if (PortNumber == 0xCF8) {
Result = x86ConfigMechanism2.CSE;
} else if (PortNumber == 0xCFA) {
Result = x86ConfigMechanism2.Forward;
} else {
Result = READ_REGISTER_UCHAR(u.Byte);
}
} else if (DataType == LONG_DATA) {
if (((ULONG)u.Long & 0x3) != 0) {
Result = (READ_REGISTER_UCHAR(u.Byte + 0)) |
(READ_REGISTER_UCHAR(u.Byte + 1) << 8) |
(READ_REGISTER_UCHAR(u.Byte + 2) << 16) |
(READ_REGISTER_UCHAR(u.Byte + 3) << 24);
} else {
//
// Watch out for reads from CF8, the eagle will generate a config
// cycle rather than returning the contents of the CONFIG_ADDR reg.
//
if (PortNumber == 0xCF8) {
Result = x86CF8Shadow;
} else {
Result = READ_REGISTER_ULONG(u.Long);
}
}
} else {
if (((ULONG)u.Word & 0x1) != 0) {
Result = (READ_REGISTER_UCHAR(u.Byte + 0)) |
(READ_REGISTER_UCHAR(u.Byte + 1) << 8);
} else {
Result = READ_REGISTER_USHORT(u.Word);
}
}
return Result;
}
VOID
x86BiosWriteIoSpace (
IN XM_OPERATION_DATATYPE DataType,
IN USHORT PortNumber,
IN ULONG Value
)
/*++
Routine Description:
This function write to emulated I/O space.
N.B. If an aligned operation is specified, then the individual
bytes are written to the specified port one at a time.
Arguments:
DataType - Supplies the datatype for the write operation.
PortNumber - Supplies the port number in I/O space to write to.
Value - Supplies the value to write.
Return Value:
None.
--*/
{
union {
PUCHAR Byte;
PUSHORT Word;
PULONG Long;
} u;
//
// Convert mechanism #2 config accesses to mechanism #1.
//
if (((PortNumber & 0xF000) == 0xC000) &&
((x86ConfigMechanism2.CSE & 0xF0) != 0)) {
WRITE_REGISTER_ULONG(x86BiosIoSpace + 0xCF8,
(1 << 31) | // Enable
(x86ConfigMechanism2.Forward << 16) | // Bus
((((PortNumber & 0x0F00) >> 8) + 11) << 11) | // Dev
(((x86ConfigMechanism2.CSE & 0x0E) >> 1) << 8) | // Function
(PortNumber & 0x00FC) // Register
);
PortNumber = 0xCFC + (PortNumber & 3); // convert to config data port
// and let code below do the rest
}
//
// Compute port address and read port.
//
u.Long = (PULONG)(x86BiosIoSpace + PortNumber);
if (DataType == BYTE_DATA) {
//
// Emulate config mechanism #2
//
if (PortNumber == 0xCF8) {
x86ConfigMechanism2.CSE = (UCHAR)Value;
} else if (PortNumber == 0xCFA) {
x86ConfigMechanism2.Forward = (UCHAR)Value;
} else {
WRITE_REGISTER_UCHAR(u.Byte, (UCHAR)Value);
}
} else if (DataType == LONG_DATA) {
if (((ULONG)u.Long & 0x3) != 0) {
WRITE_REGISTER_UCHAR(u.Byte + 0, (UCHAR)(Value));
WRITE_REGISTER_UCHAR(u.Byte + 1, (UCHAR)(Value >> 8));
WRITE_REGISTER_UCHAR(u.Byte + 2, (UCHAR)(Value >> 16));
WRITE_REGISTER_UCHAR(u.Byte + 3, (UCHAR)(Value >> 24));
} else {
WRITE_REGISTER_ULONG(u.Long, Value);
//
// Shadow writes to CF8.
//
if (PortNumber == 0xCF8) {
x86CF8Shadow = Value;
}
}
} else {
if (((ULONG)u.Word & 0x1) != 0) {
WRITE_REGISTER_UCHAR(u.Byte + 0, (UCHAR)(Value));
WRITE_REGISTER_UCHAR(u.Byte + 1, (UCHAR)(Value >> 8));
} else {
WRITE_REGISTER_USHORT(u.Word, (USHORT)Value);
}
}
return;
}
VOID
x86BiosInitializeBios (
IN PVOID BiosIoSpace,
IN PVOID BiosIoMemory
)
/*++
Routine Description:
This function initializes x86 BIOS emulation.
Arguments:
BiosIoSpace - Supplies the base address of the I/O space to be used
for BIOS emulation.
BiosIoMemory - Supplies the base address of the I/O memory to be
used for BIOS emulation.
Return Value:
None.
--*/
{
//
// Zero low memory.
//
memset(&x86BiosLowMemory, 0, LOW_MEMORY_SIZE);
//
// Save base address of I/O memory and I/O space.
//
x86BiosIoSpace = (ULONG)BiosIoSpace;
x86BiosIoMemory = (ULONG)BiosIoMemory;
//
// Initialize the emulator and the BIOS.
//
XmInitializeEmulator(0,
LOW_MEMORY_SIZE,
x86BiosReadIoSpace,
x86BiosWriteIoSpace,
x86BiosTranslateAddress);
x86BiosInitialized = TRUE;
return;
}
XM_STATUS
x86BiosExecuteInterrupt (
IN UCHAR Number,
IN OUT PXM86_CONTEXT Context,
IN PVOID BiosIoSpace OPTIONAL,
IN PVOID BiosIoMemory OPTIONAL
)
/*++
Routine Description:
This function executes an interrupt by calling the x86 emulator.
Arguments:
Number - Supplies the number of the interrupt that is to be emulated.
Context - Supplies a pointer to an x86 context structure.
Return Value:
The emulation completion status.
--*/
{
XM_STATUS Status;
//
// If a new base address is specified, then set the appropriate base.
//
if (BiosIoSpace != NULL) {
x86BiosIoSpace = (ULONG)BiosIoSpace;
}
if (BiosIoMemory != NULL) {
x86BiosIoMemory = (ULONG)BiosIoMemory;
}
//
// Execute the specified interrupt.
//
Status = XmEmulateInterrupt(Number, Context);
if (Status != XM_SUCCESS) {
DbgPrint("HAL: Interrupt emulation failed, status %lx\n", Status);
}
return Status;
}
XM_STATUS
x86BiosInitializeAdapter (
IN ULONG Adapter,
IN OUT PXM86_CONTEXT Context OPTIONAL,
IN PVOID BiosIoSpace OPTIONAL,
IN PVOID BiosIoMemory OPTIONAL
)
/*++
Routine Description:
This function initializes the adapter whose BIOS starts at the
specified 20-bit address.
Arguments:
Adpater - Supplies the 20-bit address of the BIOS for the adapter
to be initialized.
Return Value:
The emulation completion status.
--*/
{
PUCHAR Byte;
XM86_CONTEXT State;
USHORT Offset;
USHORT Segment;
XM_STATUS Status;
//
// If BIOS emulation has not been initialized, then return an error.
//
if (x86BiosInitialized == FALSE) {
return XM_EMULATOR_NOT_INITIALIZED;
}
//
// If an emulator context is not specified, then use a default
// context.
//
if (ARGUMENT_PRESENT(Context) == FALSE) {
State.Eax = 0;
State.Ecx = 0;
State.Edx = 0;
State.Ebx = 0;
State.Ebp = 0;
State.Esi = 0;
State.Edi = 0;
Context = &State;
}
//
// If a new base address is specified, then set the appropriate base.
//
if (BiosIoSpace != NULL) {
x86BiosIoSpace = (ULONG)BiosIoSpace;
}
if (BiosIoMemory != NULL) {
x86BiosIoMemory = (ULONG)BiosIoMemory;
}
//
// If the specified adpater is not BIOS code, then return an error.
//
Segment = (USHORT)((Adapter >> 4) & 0xf000);
Offset = (USHORT)(Adapter & 0xffff);
Byte = (PUCHAR)x86BiosTranslateAddress(Segment, Offset);
if ((*Byte++ != 0x55) || (*Byte != 0xaa)) {
return XM_ILLEGAL_CODE_SEGMENT;
}
//
// Call the BIOS code to initialize the specified adapter.
//
Adapter += 3;
Segment = (USHORT)((Adapter >> 4) & 0xf000);
Offset = (USHORT)(Adapter & 0xffff);
Status = XmEmulateFarCall(Segment, Offset, Context);
if (Status != XM_SUCCESS) {
DbgPrint("HAL: Adapter initialization falied, status %lx\n", Status);
}
return Status;
}