/* 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 "bop.h"
+#include "vddsup.h"
+#include "io.h"
+#include "registers.h"
+#include "vga.h"
+#include "pic.h"
-static VOID EmulatorReadMemory(PVOID Context, UINT Address, LPBYTE Buffer, INT Size)
+// HACK
+typedef INT VDM_MODE;
+
+/* PRIVATE VARIABLES **********************************************************/
+
+FAST486_STATE EmulatorContext;
+
+static BOOLEAN A20Line = FALSE;
+
+/* BOP Identifiers */
+#define BOP_DEBUGGER 0x56 // Break into the debugger from a 16-bit app
+
+/* PRIVATE FUNCTIONS **********************************************************/
+
+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))
+ /*
+ * Check if we are going to read the VGA memory and
+ * copy it into the virtual address space if needed.
+ */
+ if (((Address + Size) >= VgaGetVideoBaseAddress())
+ && (Address < VgaGetVideoLimitAddress()))
{
- /* Call the VDM BIOS to update the video memory */
- BiosUpdateConsole(max(Address, CONSOLE_VIDEO_MEM_START),
- min(Address + Size, CONSOLE_VIDEO_MEM_END));
+ DWORD VgaAddress = max(Address, VgaGetVideoBaseAddress());
+ DWORD ActualSize = min(Address + Size - 1, VgaGetVideoLimitAddress())
+ - VgaAddress + 1;
+ LPBYTE DestBuffer = (LPBYTE)((ULONG_PTR)BaseAddress + VgaAddress);
+
+ /* Read from the VGA memory */
+ VgaReadMemory(VgaAddress, DestBuffer, ActualSize);
}
/* Read the data from the virtual address space and store it in the buffer */
RtlCopyMemory(Buffer, (LPVOID)((ULONG_PTR)BaseAddress + Address), Size);
}
-static VOID EmulatorWriteMemory(PVOID Context, UINT Address, LPBYTE Buffer, INT Size)
+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;
/* Read the data from the buffer and store it in the virtual address space */
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))
+ /*
+ * Check if we modified the VGA memory.
+ */
+ 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());
+ DWORD ActualSize = min(Address + Size - 1, VgaGetVideoLimitAddress())
+ - VgaAddress + 1;
+ LPBYTE SrcBuffer = (LPBYTE)((ULONG_PTR)BaseAddress + VgaAddress);
-static VOID EmulatorReadIo(PVOID Context, UINT Address, LPBYTE Buffer, INT Size)
-{
- switch (Address)
- {
- case PIC_MASTER_CMD:
- case PIC_SLAVE_CMD:
- {
- *Buffer = PicReadCommand(Address);
- break;
- }
-
- case PIC_MASTER_DATA:
- case PIC_SLAVE_DATA:
- {
- *Buffer = PicReadData(Address);
- break;
- }
+ /* Write to the VGA memory */
+ VgaWriteMemory(VgaAddress, SrcBuffer, ActualSize);
}
}
-static VOID EmulatorWriteIo(PVOID Context, UINT Address, LPBYTE Buffer, INT Size)
+UCHAR WINAPI EmulatorIntAcknowledge(PFAST486_STATE State)
{
- BYTE Byte = *Buffer;
+ UNREFERENCED_PARAMETER(State);
- switch (Address)
- {
- case PIT_COMMAND_PORT:
- {
- PitWriteCommand(Byte);
- break;
- }
-
- case PIT_DATA_PORT(0):
- case PIT_DATA_PORT(1):
- case PIT_DATA_PORT(2):
- {
- PitWriteData(Address - PIT_DATA_PORT(0), Byte);
- break;
- }
-
- case PIC_MASTER_CMD:
- case PIC_SLAVE_CMD:
- {
- PicWriteCommand(Address, Byte);
- break;
- }
-
- case PIC_MASTER_DATA:
- case PIC_SLAVE_DATA:
- {
- PicWriteData(Address, Byte);
- break;
- }
- }
+ /* Get the interrupt number from the PIC */
+ return PicGetInterrupt();
}
-static VOID EmulatorSoftwareInt(PVOID Context, BYTE Number)
+VOID WINAPI EmulatorDebugBreak(LPWORD Stack)
{
- WORD StackSegment, StackPointer, CodeSegment, InstructionPointer;
- BYTE IntNum;
-
- /* 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 interrupt number */
- IntNum = *(LPBYTE)((ULONG_PTR)BaseAddress + TO_LINEAR(StackSegment, StackPointer));
-
- /* Move the stack pointer forward one word to skip the interrupt number */
- StackPointer += sizeof(WORD);
-
- /* Get the CS:IP */
- InstructionPointer = *(LPWORD)((ULONG_PTR)BaseAddress
- + TO_LINEAR(StackSegment, StackPointer));
- CodeSegment = *(LPWORD)((ULONG_PTR)BaseAddress
- + TO_LINEAR(StackSegment, StackPointer + sizeof(WORD)));
-
- /* Check if this was an exception */
- if (IntNum < 8)
- {
- /* Display a message to the user */
- DisplayMessage(L"Exception: %s occured at %04X:%04X",
- ExceptionName[IntNum],
- CodeSegment,
- InstructionPointer);
-
- /* Stop the VDM */
- VdmRunning = FALSE;
- return;
- }
-
- /* Check if this was an PIC IRQ */
- 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);
- }
- 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);
- }
-
- switch (IntNum)
- {
- case VIDEO_BIOS_INTERRUPT:
- {
- /* This is the video BIOS interrupt, call the BIOS */
- BiosVideoService();
- break;
- }
- case 0x20:
- {
- DosInt20h(CodeSegment);
- break;
- }
- case 0x21:
- {
- DosInt21h(CodeSegment);
- break;
- }
- case 0x23:
- {
- DosBreakInterrupt();
- break;
- }
- }
- }
+ DPRINT1("NTVDM: BOP_DEBUGGER\n");
+ DebugBreak();
}
/* PUBLIC FUNCTIONS ***********************************************************/
-BOOLEAN EmulatorInitialize()
+BOOLEAN EmulatorInitialize(VOID)
{
/* 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;
+ /* Initialize the CPU */
+ Fast486Initialize(&EmulatorContext,
+ EmulatorReadMemory,
+ EmulatorWriteMemory,
+ EmulatorReadIo,
+ EmulatorWriteIo,
+ NULL,
+ EmulatorBiosOperation,
+ EmulatorIntAcknowledge,
+ NULL /* TODO: Use a TLB */);
- /* Set MMIO read/write callbacks */
- EmulatorContext.callbacks->on_read_io = EmulatorReadIo;
- EmulatorContext.callbacks->on_write_io = EmulatorWriteIo;
+ /* Enable interrupts */
+ setIF(1);
- /* Set interrupt callbacks */
- EmulatorContext.callbacks->on_sw_int = EmulatorSoftwareInt;
+ /* Initialize VDD support */
+ VDDSupInitialize();
- /* Connect the emulated FPU to the emulated CPU */
- softx87_connect_to_CPU(&EmulatorContext, &FpuEmulatorContext);
+ /* Register the DebugBreak BOP */
+ RegisterBop(BOP_DEBUGGER, EmulatorDebugBreak);
return TRUE;
}
-VOID EmulatorSetStack(WORD Segment, WORD Offset)
+VOID EmulatorCleanup(VOID)
{
- /* Call the softx86 API */
- softx86_set_stack_ptr(&EmulatorContext, Segment, Offset);
+ /* Free the memory allocated for the 16-bit address space */
+ if (BaseAddress != NULL) HeapFree(GetProcessHeap(), 0, BaseAddress);
}
+// 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)
+VOID EmulatorStep(VOID)
{
- if (Register < EMULATOR_REG_CS)
- {
- return EmulatorContext.state->general_reg[Register].val;
- }
- else
- {
- return EmulatorContext.state->segment_reg[(Register >> 3) - 1].val;
- }
+ /* Dump the state for debugging purposes */
+ // Fast486DumpState(&EmulatorContext);
+
+ /* Execute the next instruction */
+ Fast486StepInto(&EmulatorContext);
}
-VOID EmulatorSetRegister(ULONG Register, ULONG Value)
+VOID EmulatorSetA20(BOOLEAN Enabled)
{
- if (Register < EMULATOR_REG_CS)
- {
- EmulatorContext.state->general_reg[Register].val = Value;
- }
- else
- {
- EmulatorContext.state->segment_reg[(Register >> 3) - 1].val = Value;
- }
+ A20Line = Enabled;
}
-BOOLEAN EmulatorGetFlag(ULONG Flag)
+
+
+VOID
+WINAPI
+VDDTerminateVDM(VOID)
{
- return (EmulatorContext.state->reg_flags.val & Flag);
+ /* Stop the VDM */
+ VdmRunning = FALSE;
}
-VOID EmulatorSetFlag(ULONG Flag)
+PBYTE
+WINAPI
+Sim32pGetVDMPointer(IN ULONG Address,
+ IN BOOLEAN ProtectedMode)
{
- EmulatorContext.state->reg_flags.val |= Flag;
+ // FIXME
+ UNREFERENCED_PARAMETER(ProtectedMode);
+
+ /*
+ * HIWORD(Address) == Segment (if ProtectedMode == FALSE)
+ * or Selector (if ProtectedMode == TRUE )
+ * LOWORD(Address) == Offset
+ */
+ return (PBYTE)FAR_POINTER(Address);
}
-VOID EmulatorClearFlag(ULONG Flag)
+PBYTE
+WINAPI
+MGetVdmPointer(IN ULONG Address,
+ IN ULONG Size,
+ IN BOOLEAN ProtectedMode)
{
- EmulatorContext.state->reg_flags.val &= ~Flag;
+ UNREFERENCED_PARAMETER(Size);
+ return Sim32pGetVDMPointer(Address, ProtectedMode);
}
-VOID EmulatorStep()
+PVOID
+WINAPI
+VdmMapFlat(IN USHORT Segment,
+ IN ULONG Offset,
+ IN VDM_MODE Mode)
{
- /* Call the softx86 API */
- softx86_step(&EmulatorContext);
+ // FIXME
+ UNREFERENCED_PARAMETER(Mode);
+
+ return SEG_OFF_TO_PTR(Segment, Offset);
}
-VOID EmulatorCleanup()
+BOOL
+WINAPI
+VdmFlushCache(IN USHORT Segment,
+ IN ULONG Offset,
+ IN ULONG Size,
+ IN VDM_MODE Mode)
{
- /* Free the memory allocated for the 16-bit address space */
- if (BaseAddress != NULL) HeapFree(GetProcessHeap(), 0, BaseAddress);
+ // FIXME
+ UNIMPLEMENTED;
+ return TRUE;
+}
- /* Free the softx86 CPU and FPU emulator */
- softx86_free(&EmulatorContext);
- softx87_free(&FpuEmulatorContext);
+BOOL
+WINAPI
+VdmUnmapFlat(IN USHORT Segment,
+ IN ULONG Offset,
+ IN PVOID Buffer,
+ IN VDM_MODE Mode)
+{
+ // FIXME
+ UNIMPLEMENTED;
+ return TRUE;
}
/* EOF */
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