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https://github.com/reactos/reactos.git
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90ab15cf66
- Thanks Thomas for having pointed me towards the fact that the NTVDM exports were really STDCALL and not CDECL (as I've thought first, because originally I was checking whether the getXX() functions were stdcall or not, and distinguishing VOID stdcall or cdecl functions without the symbols was hopeless). - Halfplement and export Sim32pGetVDMPointer and MGetVdmPointer, needed to run correctly the RageStorm "galaxy" sample mentioned yesterday (see revision 61283). Now it loads and the dispatch call works \o/ - VDD_INIT_PROC and VDD_DISPATCH_PROC have the same signature --> rename them to VDD_PROC. Have fun at testing! svn path=/branches/ntvdm/; revision=61286
196 lines
5.5 KiB
C
196 lines
5.5 KiB
C
/*
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* COPYRIGHT: GPL - See COPYING in the top level directory
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* PROJECT: ReactOS Virtual DOS Machine
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* FILE: emulator.c
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* PURPOSE: Minimal x86 machine emulator for the VDM
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* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
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*/
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/* INCLUDES *******************************************************************/
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#define NDEBUG
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#include "emulator.h"
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#include "bios.h"
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#include "bop.h"
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#include "vddsup.h"
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#include "io.h"
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#include "registers.h"
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#include "vga.h"
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#include "pic.h"
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/* PRIVATE VARIABLES **********************************************************/
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FAST486_STATE EmulatorContext;
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static BOOLEAN A20Line = FALSE;
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/* BOP Identifiers */
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#define BOP_DEBUGGER 0x56 // Break into the debugger from a 16-bit app
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/* PRIVATE FUNCTIONS **********************************************************/
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VOID WINAPI EmulatorReadMemory(PFAST486_STATE State, ULONG Address, PVOID Buffer, ULONG Size)
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{
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UNREFERENCED_PARAMETER(State);
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/* If the A20 line is disabled, mask bit 20 */
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if (!A20Line) Address &= ~(1 << 20);
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/* Make sure the requested address is valid */
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if ((Address + Size) >= MAX_ADDRESS) return;
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/* Read the data from the virtual address space and store it in the buffer */
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RtlCopyMemory(Buffer, (LPVOID)((ULONG_PTR)BaseAddress + Address), Size);
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/* Check if we modified the console video memory */
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if (((Address + Size) >= VgaGetVideoBaseAddress())
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&& (Address < VgaGetVideoLimitAddress()))
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{
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DWORD VgaAddress = max(Address, VgaGetVideoBaseAddress());
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DWORD ActualSize = min(Address + Size - 1, VgaGetVideoLimitAddress())
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- VgaAddress + 1;
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LPBYTE VgaBuffer = (LPBYTE)((ULONG_PTR)Buffer + VgaAddress - Address);
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/* Read from the VGA memory */
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VgaReadMemory(VgaAddress, VgaBuffer, ActualSize);
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}
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}
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VOID WINAPI EmulatorWriteMemory(PFAST486_STATE State, ULONG Address, PVOID Buffer, ULONG Size)
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{
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UNREFERENCED_PARAMETER(State);
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/* If the A20 line is disabled, mask bit 20 */
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if (!A20Line) Address &= ~(1 << 20);
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/* Make sure the requested address is valid */
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if ((Address + Size) >= MAX_ADDRESS) return;
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/* Make sure we don't write to the ROM area */
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if ((Address + Size) >= ROM_AREA_START && (Address < ROM_AREA_END)) return;
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/* Read the data from the buffer and store it in the virtual address space */
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RtlCopyMemory((LPVOID)((ULONG_PTR)BaseAddress + Address), Buffer, Size);
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/* Check if we modified the console video memory */
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if (((Address + Size) >= VgaGetVideoBaseAddress())
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&& (Address < VgaGetVideoLimitAddress()))
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{
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DWORD VgaAddress = max(Address, VgaGetVideoBaseAddress());
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DWORD ActualSize = min(Address + Size - 1, VgaGetVideoLimitAddress())
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- VgaAddress + 1;
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LPBYTE VgaBuffer = (LPBYTE)((ULONG_PTR)Buffer + VgaAddress - Address);
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/* Write to the VGA memory */
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VgaWriteMemory(VgaAddress, VgaBuffer, ActualSize);
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}
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}
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UCHAR WINAPI EmulatorIntAcknowledge(PFAST486_STATE State)
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{
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UNREFERENCED_PARAMETER(State);
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/* Get the interrupt number from the PIC */
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return PicGetInterrupt();
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}
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VOID WINAPI EmulatorDebugBreak(LPWORD Stack)
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{
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DPRINT1("NTVDM: BOP_DEBUGGER\n");
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DebugBreak();
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}
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/* PUBLIC FUNCTIONS ***********************************************************/
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BOOLEAN EmulatorInitialize(VOID)
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{
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/* Allocate memory for the 16-bit address space */
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BaseAddress = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, MAX_ADDRESS);
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if (BaseAddress == NULL) return FALSE;
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/* Initialize the CPU */
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Fast486Initialize(&EmulatorContext,
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EmulatorReadMemory,
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EmulatorWriteMemory,
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EmulatorReadIo,
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EmulatorWriteIo,
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NULL,
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EmulatorBiosOperation,
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EmulatorIntAcknowledge,
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NULL /* TODO: Use a TLB */);
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/* Enable interrupts */
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setIF(1);
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/* Initialize VDD support */
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VDDSupInitialize();
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/* Register the DebugBreak BOP */
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RegisterBop(BOP_DEBUGGER, EmulatorDebugBreak);
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return TRUE;
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}
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VOID EmulatorCleanup(VOID)
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{
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/* Free the memory allocated for the 16-bit address space */
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if (BaseAddress != NULL) HeapFree(GetProcessHeap(), 0, BaseAddress);
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}
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// FIXME: This function assumes 16-bit mode!!!
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VOID EmulatorExecute(WORD Segment, WORD Offset)
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{
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/* Tell Fast486 to move the instruction pointer */
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Fast486ExecuteAt(&EmulatorContext, Segment, Offset);
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}
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VOID EmulatorInterrupt(BYTE Number)
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{
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/* Call the Fast486 API */
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Fast486Interrupt(&EmulatorContext, Number);
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}
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VOID EmulatorInterruptSignal(VOID)
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{
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/* Call the Fast486 API */
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Fast486InterruptSignal(&EmulatorContext);
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}
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VOID EmulatorStep(VOID)
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{
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/* Dump the state for debugging purposes */
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// Fast486DumpState(&EmulatorContext);
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/* Execute the next instruction */
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Fast486StepInto(&EmulatorContext);
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}
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VOID EmulatorSetA20(BOOLEAN Enabled)
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{
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A20Line = Enabled;
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}
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PBYTE WINAPI Sim32pGetVDMPointer(ULONG Address, BOOL ProtectedMode)
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{
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// FIXME
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UNREFERENCED_PARAMETER(ProtectedMode);
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/*
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* HIWORD(Address) == Segment (if ProtectedMode == FALSE)
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* or Selector (if ProtectedMode == TRUE )
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* LOWORD(Address) == Offset
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*/
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return SEG_OFF_TO_PTR(HIWORD(Address), LOWORD(Address));
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}
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PBYTE WINAPI MGetVdmPointer(ULONG Address, ULONG Size, BOOL ProtectedMode)
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{
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UNREFERENCED_PARAMETER(Size);
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return Sim32pGetVDMPointer(Address, ProtectedMode);
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}
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/* EOF */
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