+++ /dev/null
-/*
- * Fast486 386/486 CPU Emulation Library
- * fast486.c
- *
- * Copyright (C) 2015 Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- */
-
-/* INCLUDES *******************************************************************/
-
-#include <windef.h>
-
-// #define NDEBUG
-#include <debug.h>
-
-#include <fast486.h>
-#include "common.h"
-#include "opcodes.h"
-#include "fpu.h"
-
-/* DEFAULT CALLBACKS **********************************************************/
-
-static VOID
-FASTCALL
-Fast486MemReadCallback(PFAST486_STATE State, ULONG Address, PVOID Buffer, ULONG Size)
-{
- UNREFERENCED_PARAMETER(State);
- RtlMoveMemory(Buffer, (PVOID)Address, Size);
-}
-
-static VOID
-FASTCALL
-Fast486MemWriteCallback(PFAST486_STATE State, ULONG Address, PVOID Buffer, ULONG Size)
-{
- UNREFERENCED_PARAMETER(State);
- RtlMoveMemory((PVOID)Address, Buffer, Size);
-}
-
-static VOID
-FASTCALL
-Fast486IoReadCallback(PFAST486_STATE State, USHORT Port, PVOID Buffer, ULONG DataCount, UCHAR DataSize)
-{
- UNREFERENCED_PARAMETER(State);
- UNREFERENCED_PARAMETER(Port);
- UNREFERENCED_PARAMETER(Buffer);
- UNREFERENCED_PARAMETER(DataCount);
- UNREFERENCED_PARAMETER(DataSize);
-}
-
-static VOID
-FASTCALL
-Fast486IoWriteCallback(PFAST486_STATE State, USHORT Port, PVOID Buffer, ULONG DataCount, UCHAR DataSize)
-{
- UNREFERENCED_PARAMETER(State);
- UNREFERENCED_PARAMETER(Port);
- UNREFERENCED_PARAMETER(Buffer);
- UNREFERENCED_PARAMETER(DataCount);
- UNREFERENCED_PARAMETER(DataSize);
-}
-
-static VOID
-FASTCALL
-Fast486BopCallback(PFAST486_STATE State, UCHAR BopCode)
-{
- UNREFERENCED_PARAMETER(State);
- UNREFERENCED_PARAMETER(BopCode);
-}
-
-static UCHAR
-FASTCALL
-Fast486IntAckCallback(PFAST486_STATE State)
-{
- UNREFERENCED_PARAMETER(State);
-
- /* Return something... defaulted to single-step interrupt */
- return 0x01;
-}
-
-static VOID
-FASTCALL
-Fast486FpuCallback(PFAST486_STATE State)
-{
- UNREFERENCED_PARAMETER(State);
-}
-
-/* PUBLIC FUNCTIONS ***********************************************************/
-
-VOID
-NTAPI
-Fast486Initialize(PFAST486_STATE State,
- FAST486_MEM_READ_PROC MemReadCallback,
- FAST486_MEM_WRITE_PROC MemWriteCallback,
- FAST486_IO_READ_PROC IoReadCallback,
- FAST486_IO_WRITE_PROC IoWriteCallback,
- FAST486_BOP_PROC BopCallback,
- FAST486_INT_ACK_PROC IntAckCallback,
- FAST486_FPU_PROC FpuCallback,
- PULONG Tlb)
-{
- /* Set the callbacks (or use default ones if some are NULL) */
- State->MemReadCallback = (MemReadCallback ? MemReadCallback : Fast486MemReadCallback );
- State->MemWriteCallback = (MemWriteCallback ? MemWriteCallback : Fast486MemWriteCallback);
- State->IoReadCallback = (IoReadCallback ? IoReadCallback : Fast486IoReadCallback );
- State->IoWriteCallback = (IoWriteCallback ? IoWriteCallback : Fast486IoWriteCallback );
- State->BopCallback = (BopCallback ? BopCallback : Fast486BopCallback );
- State->IntAckCallback = (IntAckCallback ? IntAckCallback : Fast486IntAckCallback );
- State->FpuCallback = (FpuCallback ? FpuCallback : Fast486FpuCallback );
-
- /* Set the TLB (if given) */
- State->Tlb = Tlb;
-
- /* Reset the CPU */
- Fast486Reset(State);
-}
-
-VOID
-NTAPI
-Fast486Reset(PFAST486_STATE State)
-{
- FAST486_SEG_REGS i;
-
- /* Save the callbacks and TLB */
- FAST486_MEM_READ_PROC MemReadCallback = State->MemReadCallback;
- FAST486_MEM_WRITE_PROC MemWriteCallback = State->MemWriteCallback;
- FAST486_IO_READ_PROC IoReadCallback = State->IoReadCallback;
- FAST486_IO_WRITE_PROC IoWriteCallback = State->IoWriteCallback;
- FAST486_BOP_PROC BopCallback = State->BopCallback;
- FAST486_INT_ACK_PROC IntAckCallback = State->IntAckCallback;
- FAST486_FPU_PROC FpuCallback = State->FpuCallback;
- PULONG Tlb = State->Tlb;
-
- /* Clear the entire structure */
- RtlZeroMemory(State, sizeof(*State));
-
- /* Initialize the registers */
- State->Flags.AlwaysSet = 1;
- State->InstPtr.LowWord = 0xFFF0;
-
- /* Set the CPL to 0 */
- State->Cpl = 0;
-
- /* Initialize segments */
- for (i = 0; i < FAST486_NUM_SEG_REGS; i++)
- {
- State->SegmentRegs[i].Selector = 0;
- State->SegmentRegs[i].Base = 0;
- State->SegmentRegs[i].Limit = 0xFFFF;
- State->SegmentRegs[i].Present = TRUE;
- State->SegmentRegs[i].ReadWrite = TRUE;
- State->SegmentRegs[i].Executable = FALSE;
- State->SegmentRegs[i].DirConf = FALSE;
- State->SegmentRegs[i].SystemType = 1; // Segment descriptor
- State->SegmentRegs[i].Dpl = 0;
- State->SegmentRegs[i].Size = FALSE; // 16-bit
- }
-
- /* Initialize the code segment */
- State->SegmentRegs[FAST486_REG_CS].Executable = TRUE;
- State->SegmentRegs[FAST486_REG_CS].Selector = 0xF000;
- State->SegmentRegs[FAST486_REG_CS].Base = 0xFFFF0000;
-
- /* Initialize the IDT */
- State->Idtr.Size = 0x3FF;
- State->Idtr.Address = 0;
-
-#ifndef FAST486_NO_FPU
- /* Initialize CR0 */
- State->ControlRegisters[FAST486_REG_CR0] |= FAST486_CR0_ET;
-
- /* Initialize the FPU control and tag registers */
- State->FpuControl.Value = FAST486_FPU_DEFAULT_CONTROL;
- State->FpuStatus.Value = 0;
- State->FpuTag = 0xFFFF;
-#endif
-
- /* Restore the callbacks and TLB */
- State->MemReadCallback = MemReadCallback;
- State->MemWriteCallback = MemWriteCallback;
- State->IoReadCallback = IoReadCallback;
- State->IoWriteCallback = IoWriteCallback;
- State->BopCallback = BopCallback;
- State->IntAckCallback = IntAckCallback;
- State->FpuCallback = FpuCallback;
- State->Tlb = Tlb;
-
- /* Flush the TLB */
- Fast486FlushTlb(State);
-}
-
-VOID
-NTAPI
-Fast486InterruptSignal(PFAST486_STATE State)
-{
- State->IntSignaled = TRUE;
-}
-
-VOID
-NTAPI
-Fast486ExecuteAt(PFAST486_STATE State, USHORT Segment, ULONG Offset)
-{
- /* Load the new CS */
- if (!Fast486LoadSegment(State, FAST486_REG_CS, Segment))
- {
- /* An exception occurred, let the handler execute instead */
- return;
- }
-
- /* Set the new IP */
- State->InstPtr.Long = Offset;
-}
-
-VOID
-NTAPI
-Fast486SetStack(PFAST486_STATE State, USHORT Segment, ULONG Offset)
-{
- /* Load the new SS */
- if (!Fast486LoadSegment(State, FAST486_REG_SS, Segment))
- {
- /* An exception occurred, let the handler execute instead */
- return;
- }
-
- /* Set the new SP */
- State->GeneralRegs[FAST486_REG_ESP].Long = Offset;
-}
-
-VOID
-NTAPI
-Fast486SetSegment(PFAST486_STATE State,
- FAST486_SEG_REGS Segment,
- USHORT Selector)
-{
- /* Call the internal function */
- Fast486LoadSegment(State, Segment, Selector);
-}
-
-VOID
-NTAPI
-Fast486Rewind(PFAST486_STATE State)
-{
- /* This function is used when an instruction has been interrupted remotely */
- State->PrefixFlags = 0;
- State->InstPtr.Long = State->SavedInstPtr.Long;
-
-#ifndef FAST486_NO_PREFETCH
- State->PrefetchValid = FALSE;
-#endif
-}
-
-/* EOF */
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