/* INCLUDES *******************************************************************/
-#include "ntvdm.h"
-#include <softx86/softx86.h>
-#include <softx86/softx87.h>
+#define NDEBUG
-softx86_ctx EmulatorContext;
-softx87_ctx FpuEmulatorContext;
+#include "emulator.h"
+#include "bios.h"
+#include "dos.h"
+#include "vga.h"
+#include "pic.h"
+#include "ps2.h"
+#include "timer.h"
-static VOID EmulatorReadMemory(PVOID Context, UINT Address, LPBYTE Buffer, INT Size)
+/* PRIVATE VARIABLES **********************************************************/
+
+FAST486_STATE EmulatorContext;
+
+static BOOLEAN A20Line = FALSE;
+
+/* PRIVATE FUNCTIONS **********************************************************/
+
+static VOID WINAPI EmulatorReadMemory(PFAST486_STATE State, ULONG Address, PVOID Buffer, ULONG Size)
{
+ UNREFERENCED_PARAMETER(State);
+
+ /* If the A20 line is disabled, mask bit 20 */
+ if (!A20Line) Address &= ~(1 << 20);
+
/* Make sure the requested address is valid */
if ((Address + Size) >= MAX_ADDRESS) return;
- /* Are we reading some of the console video memory? */
- if (((Address + Size) >= CONSOLE_VIDEO_MEM_START)
- && (Address < CONSOLE_VIDEO_MEM_END))
- {
- /* Call the VDM BIOS to update the video memory */
- BiosUpdateConsole(max(Address, CONSOLE_VIDEO_MEM_START),
- min(Address + Size, CONSOLE_VIDEO_MEM_END));
- }
-
/* Read the data from the virtual address space and store it in the buffer */
RtlCopyMemory(Buffer, (LPVOID)((ULONG_PTR)BaseAddress + Address), Size);
+
+ /* Check if we modified the console video memory */
+ if (((Address + Size) >= VgaGetVideoBaseAddress())
+ && (Address < VgaGetVideoLimitAddress()))
+ {
+ DWORD VgaAddress = max(Address, VgaGetVideoBaseAddress());
+ LPBYTE VgaBuffer = (LPBYTE)((ULONG_PTR)Buffer + VgaAddress - Address);
+
+ /* Read from the VGA memory */
+ VgaReadMemory(VgaAddress, VgaBuffer, Size);
+ }
}
-static VOID EmulatorWriteMemory(PVOID Context, UINT Address, LPBYTE Buffer, INT Size)
+static VOID WINAPI EmulatorWriteMemory(PFAST486_STATE State, ULONG Address, PVOID Buffer, ULONG Size)
{
+ UNREFERENCED_PARAMETER(State);
+
+ /* If the A20 line is disabled, mask bit 20 */
+ if (!A20Line) Address &= ~(1 << 20);
+
/* Make sure the requested address is valid */
if ((Address + Size) >= MAX_ADDRESS) return;
RtlCopyMemory((LPVOID)((ULONG_PTR)BaseAddress + Address), Buffer, Size);
/* Check if we modified the console video memory */
- if (((Address + Size) >= CONSOLE_VIDEO_MEM_START)
- && (Address < CONSOLE_VIDEO_MEM_END))
+ if (((Address + Size) >= VgaGetVideoBaseAddress())
+ && (Address < VgaGetVideoLimitAddress()))
{
- /* Call the VDM BIOS to update the screen */
- BiosUpdateConsole(max(Address, CONSOLE_VIDEO_MEM_START),
- min(Address + Size, CONSOLE_VIDEO_MEM_END));
+ DWORD VgaAddress = max(Address, VgaGetVideoBaseAddress());
+ LPBYTE VgaBuffer = (LPBYTE)((ULONG_PTR)Buffer + VgaAddress - Address);
+
+ /* Write to the VGA memory */
+ VgaWriteMemory(VgaAddress, VgaBuffer, Size);
}
}
-static VOID EmulatorReadIo(PVOID Context, UINT Address, LPBYTE Buffer, INT Size)
+static VOID WINAPI EmulatorReadIo(PFAST486_STATE State, ULONG Port, PVOID Buffer, ULONG Size)
{
- switch (Address)
+ LPBYTE Address = (LPBYTE)Buffer;
+
+ UNREFERENCED_PARAMETER(State);
+ UNREFERENCED_PARAMETER(Size);
+
+ switch (Port)
{
case PIC_MASTER_CMD:
case PIC_SLAVE_CMD:
{
- *Buffer = PicReadCommand(Address);
+ *Address = PicReadCommand(Port);
break;
}
case PIC_MASTER_DATA:
case PIC_SLAVE_DATA:
{
- *Buffer = PicReadData(Address);
+ *Address = PicReadData(Port);
+ break;
+ }
+
+ case PIT_DATA_PORT(0):
+ case PIT_DATA_PORT(1):
+ case PIT_DATA_PORT(2):
+ {
+ *Address = PitReadData(Port - PIT_DATA_PORT(0));
+ break;
+ }
+
+ case PS2_CONTROL_PORT:
+ {
+ *Address = KeyboardReadStatus();
+ break;
+ }
+
+ case PS2_DATA_PORT:
+ {
+ *Address = KeyboardReadData();
+ break;
+ }
+
+ case VGA_AC_WRITE:
+ case VGA_AC_READ:
+ case VGA_SEQ_INDEX:
+ case VGA_SEQ_DATA:
+ case VGA_DAC_READ_INDEX:
+ case VGA_DAC_WRITE_INDEX:
+ case VGA_DAC_DATA:
+ case VGA_MISC_READ:
+ case VGA_MISC_WRITE:
+ case VGA_CRTC_INDEX:
+ case VGA_CRTC_DATA:
+ case VGA_GC_INDEX:
+ case VGA_GC_DATA:
+ case VGA_STAT_MONO:
+ case VGA_STAT_COLOR:
+ {
+ *Address = VgaReadPort(Port);
break;
}
+
+ default:
+ {
+ DPRINT1("Read from unknown port: 0x%X\n", Port);
+ }
}
}
-static VOID EmulatorWriteIo(PVOID Context, UINT Address, LPBYTE Buffer, INT Size)
+static VOID WINAPI EmulatorWriteIo(PFAST486_STATE State, ULONG Port, PVOID Buffer, ULONG Size)
{
- BYTE Byte = *Buffer;
+ BYTE Byte = *(LPBYTE)Buffer;
- switch (Address)
+ UNREFERENCED_PARAMETER(State);
+ UNREFERENCED_PARAMETER(Size);
+
+ switch (Port)
{
case PIT_COMMAND_PORT:
{
case PIT_DATA_PORT(1):
case PIT_DATA_PORT(2):
{
- PitWriteData(Address - PIT_DATA_PORT(0), Byte);
+ PitWriteData(Port - PIT_DATA_PORT(0), Byte);
break;
}
case PIC_MASTER_CMD:
case PIC_SLAVE_CMD:
{
- PicWriteCommand(Address, Byte);
+ PicWriteCommand(Port, Byte);
break;
}
case PIC_MASTER_DATA:
case PIC_SLAVE_DATA:
{
- PicWriteData(Address, Byte);
+ PicWriteData(Port, Byte);
+ break;
+ }
+
+ case PS2_CONTROL_PORT:
+ {
+ KeyboardWriteCommand(Byte);
+ break;
+ }
+
+ case PS2_DATA_PORT:
+ {
+ KeyboardWriteData(Byte);
break;
}
+
+ case VGA_AC_WRITE:
+ case VGA_AC_READ:
+ case VGA_SEQ_INDEX:
+ case VGA_SEQ_DATA:
+ case VGA_DAC_READ_INDEX:
+ case VGA_DAC_WRITE_INDEX:
+ case VGA_DAC_DATA:
+ case VGA_MISC_READ:
+ case VGA_MISC_WRITE:
+ case VGA_CRTC_INDEX:
+ case VGA_CRTC_DATA:
+ case VGA_GC_INDEX:
+ case VGA_GC_DATA:
+ case VGA_STAT_MONO:
+ case VGA_STAT_COLOR:
+ {
+ VgaWritePort(Port, Byte);
+ break;
+ }
+
+ default:
+ {
+ DPRINT1("Write to unknown port: 0x%X\n", Port);
+ }
}
}
-static VOID EmulatorSoftwareInt(PVOID Context, BYTE Number)
+static VOID WINAPI EmulatorBiosOperation(PFAST486_STATE State, USHORT BopCode)
{
WORD StackSegment, StackPointer, CodeSegment, InstructionPointer;
BYTE IntNum;
+ LPWORD Stack;
- /* Check if this is the special interrupt */
- if (Number == SPECIAL_INT_NUM)
- {
- /* Get the SS:SP */
- StackSegment = EmulatorContext.state->segment_reg[SX86_SREG_SS].val;
- StackPointer = EmulatorContext.state->general_reg[SX86_REG_SP].val;
+ /* Get the SS:SP */
+ StackSegment = State->SegmentRegs[FAST486_REG_SS].Selector;
+ StackPointer = State->GeneralRegs[FAST486_REG_ESP].LowWord;
- /* Get the interrupt number */
- IntNum = *(LPBYTE)((ULONG_PTR)BaseAddress + TO_LINEAR(StackSegment, StackPointer));
+ /* Get the stack */
+ Stack = (LPWORD)SEG_OFF_TO_PTR(StackSegment, StackPointer);
- /* Move the stack pointer forward one word to skip the interrupt number */
- StackPointer += sizeof(WORD);
+ if (BopCode == EMULATOR_INT_BOP)
+ {
+ /* Get the interrupt number */
+ IntNum = LOBYTE(Stack[STACK_INT_NUM]);
/* Get the CS:IP */
- InstructionPointer = *(LPWORD)((ULONG_PTR)BaseAddress
- + TO_LINEAR(StackSegment, StackPointer));
- CodeSegment = *(LPWORD)((ULONG_PTR)BaseAddress
- + TO_LINEAR(StackSegment, StackPointer + sizeof(WORD)));
+ InstructionPointer = Stack[STACK_IP];
+ CodeSegment = Stack[STACK_CS];
/* Check if this was an exception */
if (IntNum < 8)
if (IntNum >= BIOS_PIC_MASTER_INT && IntNum < BIOS_PIC_MASTER_INT + 8)
{
/* It was an IRQ from the master PIC */
- BiosHandleIrq(IntNum - BIOS_PIC_MASTER_INT);
+ BiosHandleIrq(IntNum - BIOS_PIC_MASTER_INT, Stack);
+ return;
}
else if (IntNum >= BIOS_PIC_SLAVE_INT && IntNum < BIOS_PIC_SLAVE_INT + 8)
{
/* It was an IRQ from the slave PIC */
- BiosHandleIrq(IntNum - BIOS_PIC_SLAVE_INT + 8);
+ BiosHandleIrq(IntNum - BIOS_PIC_SLAVE_INT + 8, Stack);
+ return;
}
switch (IntNum)
{
- case VIDEO_BIOS_INTERRUPT:
+ case BIOS_VIDEO_INTERRUPT:
{
/* This is the video BIOS interrupt, call the BIOS */
- BiosVideoService();
+ BiosVideoService(Stack);
+ break;
+ }
+ case BIOS_EQUIPMENT_INTERRUPT:
+ {
+ /* This is the BIOS "get equipment" command, call the BIOS */
+ BiosEquipmentService(Stack);
+ break;
+ }
+ case BIOS_KBD_INTERRUPT:
+ {
+ /* This is the keyboard BIOS interrupt, call the BIOS */
+ BiosKeyboardService(Stack);
+ break;
+ }
+ case BIOS_TIME_INTERRUPT:
+ {
+ /* This is the time BIOS interrupt, call the BIOS */
+ BiosTimeService(Stack);
+ break;
+ }
+ case BIOS_SYS_TIMER_INTERRUPT:
+ {
+ /* BIOS timer update */
+ BiosSystemTimerInterrupt(Stack);
break;
}
case 0x20:
{
- DosInt20h(CodeSegment);
+ DosInt20h(Stack);
break;
}
case 0x21:
{
- DosInt21h(CodeSegment);
+ DosInt21h(Stack);
break;
}
case 0x23:
{
- DosBreakInterrupt();
+ DosBreakInterrupt(Stack);
+ break;
+ }
+ default:
+ {
+ DPRINT1("Unhandled interrupt: 0x%02X\n", IntNum);
break;
}
}
}
}
+static UCHAR WINAPI EmulatorIntAcknowledge(PFAST486_STATE State)
+{
+ UNREFERENCED_PARAMETER(State);
+
+ /* Get the interrupt number from the PIC */
+ return PicGetInterrupt();
+}
+
/* PUBLIC FUNCTIONS ***********************************************************/
BOOLEAN EmulatorInitialize()
{
/* Allocate memory for the 16-bit address space */
- BaseAddress = HeapAlloc(GetProcessHeap(), 0, MAX_ADDRESS);
+ BaseAddress = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, MAX_ADDRESS);
if (BaseAddress == NULL) return FALSE;
- /* Initialize the softx86 CPU emulator */
- if (!softx86_init(&EmulatorContext, SX86_CPULEVEL_80186))
- {
- HeapFree(GetProcessHeap(), 0, BaseAddress);
- return FALSE;
- }
-
- /* Initialize the softx87 FPU emulator*/
- if(!softx87_init(&FpuEmulatorContext, SX87_FPULEVEL_8087))
- {
- softx86_free(&EmulatorContext);
- HeapFree(GetProcessHeap(), 0, BaseAddress);
- return FALSE;
- }
-
- /* Set memory read/write callbacks */
- EmulatorContext.callbacks->on_read_memory = EmulatorReadMemory;
- EmulatorContext.callbacks->on_write_memory = EmulatorWriteMemory;
-
- /* Set MMIO read/write callbacks */
- EmulatorContext.callbacks->on_read_io = EmulatorReadIo;
- EmulatorContext.callbacks->on_write_io = EmulatorWriteIo;
+ /* Set the callbacks */
+ EmulatorContext.MemReadCallback = EmulatorReadMemory;
+ EmulatorContext.MemWriteCallback = EmulatorWriteMemory;
+ EmulatorContext.IoReadCallback = EmulatorReadIo;
+ EmulatorContext.IoWriteCallback = EmulatorWriteIo;
+ EmulatorContext.BopCallback = EmulatorBiosOperation;
+ EmulatorContext.IntAckCallback = EmulatorIntAcknowledge;
- /* Set interrupt callbacks */
- EmulatorContext.callbacks->on_sw_int = EmulatorSoftwareInt;
+ /* Reset the CPU */
+ Fast486Reset(&EmulatorContext);
- /* Connect the emulated FPU to the emulated CPU */
- softx87_connect_to_CPU(&EmulatorContext, &FpuEmulatorContext);
+ /* Enable interrupts */
+ EmulatorSetFlag(EMULATOR_FLAG_IF);
return TRUE;
}
-VOID EmulatorSetStack(WORD Segment, WORD Offset)
+VOID EmulatorSetStack(WORD Segment, DWORD Offset)
{
- /* Call the softx86 API */
- softx86_set_stack_ptr(&EmulatorContext, Segment, Offset);
+ Fast486SetStack(&EmulatorContext, Segment, Offset);
}
+// FIXME: This function assumes 16-bit mode!!!
VOID EmulatorExecute(WORD Segment, WORD Offset)
{
- /* Call the softx86 API */
- softx86_set_instruction_ptr(&EmulatorContext, Segment, Offset);
+ /* Tell Fast486 to move the instruction pointer */
+ Fast486ExecuteAt(&EmulatorContext, Segment, Offset);
}
VOID EmulatorInterrupt(BYTE Number)
{
- LPDWORD IntVecTable = (LPDWORD)((ULONG_PTR)BaseAddress);
- UINT Segment, Offset;
-
- /* Get the segment and offset */
- Segment = HIWORD(IntVecTable[Number]);
- Offset = LOWORD(IntVecTable[Number]);
+ /* Call the Fast486 API */
+ Fast486Interrupt(&EmulatorContext, Number);
+}
- /* Call the softx86 API */
- softx86_make_simple_interrupt_call(&EmulatorContext, &Segment, &Offset);
+VOID EmulatorInterruptSignal(VOID)
+{
+ /* Call the Fast486 API */
+ Fast486InterruptSignal(&EmulatorContext);
}
ULONG EmulatorGetRegister(ULONG Register)
{
if (Register < EMULATOR_REG_ES)
{
- return EmulatorContext.state->general_reg[Register].val;
+ return EmulatorContext.GeneralRegs[Register].Long;
}
else
{
- return EmulatorContext.state->segment_reg[Register - EMULATOR_REG_ES].val;
+ return EmulatorContext.SegmentRegs[Register - EMULATOR_REG_ES].Selector;
}
}
VOID EmulatorSetRegister(ULONG Register, ULONG Value)
{
- if (Register < EMULATOR_REG_CS)
+ if (Register < EMULATOR_REG_ES)
{
- EmulatorContext.state->general_reg[Register].val = Value;
+ EmulatorContext.GeneralRegs[Register].Long = Value;
}
else
{
- EmulatorContext.state->segment_reg[Register - EMULATOR_REG_ES].val = Value;
+ Fast486SetSegment(&EmulatorContext, Register - EMULATOR_REG_ES, (USHORT)Value);
}
}
+ULONG EmulatorGetProgramCounter(VOID)
+{
+ return EmulatorContext.InstPtr.Long;
+}
+
BOOLEAN EmulatorGetFlag(ULONG Flag)
{
- return (EmulatorContext.state->reg_flags.val & Flag);
+ return (EmulatorContext.Flags.Long & Flag) ? TRUE : FALSE;
}
VOID EmulatorSetFlag(ULONG Flag)
{
- EmulatorContext.state->reg_flags.val |= Flag;
+ EmulatorContext.Flags.Long |= Flag;
}
VOID EmulatorClearFlag(ULONG Flag)
{
- EmulatorContext.state->reg_flags.val &= ~Flag;
+ EmulatorContext.Flags.Long &= ~Flag;
}
-VOID EmulatorStep()
+VOID EmulatorStep(VOID)
{
- /* Call the softx86 API */
- softx86_step(&EmulatorContext);
+ /* Dump the state for debugging purposes */
+ // Fast486DumpState(&EmulatorContext);
+
+ /* Execute the next instruction */
+ Fast486StepInto(&EmulatorContext);
}
-VOID EmulatorCleanup()
+VOID EmulatorCleanup(VOID)
{
/* Free the memory allocated for the 16-bit address space */
if (BaseAddress != NULL) HeapFree(GetProcessHeap(), 0, BaseAddress);
+}
- /* Free the softx86 CPU and FPU emulator */
- softx86_free(&EmulatorContext);
- softx87_free(&FpuEmulatorContext);
+VOID EmulatorSetA20(BOOLEAN Enabled)
+{
+ A20Line = Enabled;
}
/* EOF */
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