cpu.c File Reference

#include "ntvdm.h"
#include <debug.h>
#include "emulator.h"
#include "cpu.h"
#include "memory.h"
#include "callback.h"
#include "bop.h"
#include <isvbop.h>
#include "clock.h"
#include "bios/rom.h"
#include "hardware/cmos.h"
#include "hardware/keyboard.h"
#include "hardware/mouse.h"
#include "hardware/pic.h"
#include "hardware/ps2.h"
#include "hardware/sound/speaker.h"
#include "hardware/pit.h"
#include "hardware/video/svga.h"
#include "io.h"

Include dependency graph for cpu.c:

Go to the source code of this file.

Macros
#define	NDEBUG

Functions
VOID	CpuExecute (WORD Segment, WORD Offset)
VOID	CpuStep (VOID)
LONG	CpuExceptionFilter (IN PEXCEPTION_POINTERS ExceptionInfo)
VOID	CpuSimulate (VOID)
VOID	CpuUnsimulate (VOID)
static VOID WINAPI	CpuUnsimulateBop (LPWORD Stack)
BOOLEAN	CpuInitialize (VOID)
VOID	CpuCleanup (VOID)

Variables
FAST486_STATE	EmulatorContext
BOOLEAN	CpuRunning = FALSE
static const INT	MaxCpuCallLevel = 32
static INT	CpuCallLevel = 0

Macro Definition Documentation

NDEBUG

#define NDEBUG

Definition at line 13 of file cpu.c.

Function Documentation

CpuCleanup()

VOID CpuCleanup

(

VOID

)

Definition at line 243 of file cpu.c.

{
    // Fast486Cleanup();
}

Referenced by EmulatorCleanup().

CpuExceptionFilter()

LONG CpuExceptionFilter

(

IN PEXCEPTION_POINTERS

ExceptionInfo

)

Definition at line 117 of file cpu.c.

{
    /* Get the exception record */
    PEXCEPTION_RECORD ExceptionRecord = ExceptionInfo->ExceptionRecord;
 
    switch (ExceptionRecord->ExceptionCode)
    {
        /* We only handle access violations so far */
        case EXCEPTION_ACCESS_VIOLATION:
        {
            BOOLEAN Writing = (ExceptionRecord->ExceptionInformation[0] == 1);
 
            /* Retrieve the address to which a read or write attempt was made */
            ULONG_PTR Address = ExceptionRecord->ExceptionInformation[1];
 
            /*
             * Check whether the access exception was done inside the virtual memory space
             * (caused by an emulated app) or outside (caused by a bug in ourselves).
             */
            if (Address <  (ULONG_PTR)BaseAddress ||
                Address >= (ULONG_PTR)BaseAddress + MAX_ADDRESS)
            {
                DPRINT1("NTVDM: %s access violation at 0x%p outside the virtual memory space!\n",
                        (Writing ? "Write" : "Read"), Address);
                return EXCEPTION_CONTINUE_SEARCH;
            }
 
            /* We are good to go, dispatch to our memory handlers */
 
            /* Fix the CPU state */
            Fast486Rewind(&EmulatorContext);
 
            /* Call the memory handler */
            MemExceptionHandler((ULONG_PTR)PHYS_TO_REAL(Address), Writing);
 
            /* The execution of the CPU opcode handler MUST NOT continue */
            return EXCEPTION_EXECUTE_HANDLER;
        }
 
        default:
        {
            DPRINT1("NTVDM: Exception 0x%08lx not handled!\n", ExceptionRecord->ExceptionCode);
            break;
        }
    }
 
    /* Continue to search for a handler */
    return EXCEPTION_CONTINUE_SEARCH;
}

Referenced by CpuSimulate().

CpuExecute()

VOID CpuExecute	(	WORD	Segment,
		WORD	Offset
	)

Definition at line 102 of file cpu.c.

{
    /* Tell Fast486 to move the instruction pointer */
    Fast486ExecuteAt(&EmulatorContext, Segment, Offset);
}

Referenced by DosLoadExecutableInternal(), setEIP(), and setIP().

CpuInitialize()

BOOLEAN CpuInitialize

(

VOID

)

Definition at line 216 of file cpu.c.

{
    // /* Initialize the internal clock */
    // if (!ClockInitialize())
    // {
        // wprintf(L"FATAL: Failed to initialize the clock\n");
        // return FALSE;
    // }
 
    /* Initialize the CPU */
    Fast486Initialize(&EmulatorContext,
                      EmulatorReadMemory,
                      EmulatorWriteMemory,
                      EmulatorReadIo,
                      EmulatorWriteIo,
                      EmulatorBiosOperation,
                      EmulatorIntAcknowledge,
                      EmulatorFpu,
                      NULL /* TODO: Use a TLB */);
 
    /* Initialize the software callback system and register the emulator BOPs */
    // RegisterBop(BOP_DEBUGGER  , EmulatorDebugBreakBop);
    RegisterBop(BOP_UNSIMULATE, CpuUnsimulateBop);
 
    return TRUE;
}

Referenced by EmulatorInitialize().

CpuSimulate()

VOID CpuSimulate

(

VOID

)

Definition at line 167 of file cpu.c.

{
    if (CpuCallLevel > MaxCpuCallLevel)
    {
        DisplayMessage(L"Too many CPU levels of recursion (%d, expected maximum %d)",
                       CpuCallLevel, MaxCpuCallLevel);
 
        /* Stop the VDM */
        EmulatorTerminate();
        return;
    }
    CpuCallLevel++;
    DPRINT("CpuSimulate --> Level %d\n", CpuCallLevel);
 
    CpuRunning = TRUE;
    while (VdmRunning && CpuRunning)
    {
        _SEH2_TRY
        {
            while (VdmRunning && CpuRunning) ClockUpdate();
        }
        _SEH2_EXCEPT(CpuExceptionFilter(_SEH2_GetExceptionInformation()))
        {
            DPRINT("VDM exception handler called\n");
        }
        _SEH2_END;
    }
 
    DPRINT("CpuSimulate <-- Level %d\n", CpuCallLevel);
    CpuCallLevel--;
    if (!VdmRunning || CpuCallLevel < 0) CpuCallLevel = 0;
 
    /* This takes into account for reentrance */
    if (VdmRunning && (CpuCallLevel > 0)) CpuRunning = TRUE;
}

Referenced by Call16(), VDDSimulate16(), and wmain().

CpuStep()

VOID CpuStep

(

VOID

)

Definition at line 108 of file cpu.c.

{
    /* Dump the state for debugging purposes */
    // Fast486DumpState(&EmulatorContext);
 
    /* Execute the next instruction */
    Fast486StepInto(&EmulatorContext);
}

Referenced by ClockUpdate().

CpuUnsimulate()

VOID CpuUnsimulate

(

VOID

)

Definition at line 203 of file cpu.c.

{
    /* Stop simulation */
    CpuRunning = FALSE;
}

Referenced by CpuUnsimulateBop(), DosTerminateProcess(), and EmulatorTerminate().

CpuUnsimulateBop()

static VOID WINAPI CpuUnsimulateBop ( LPWORD  Stack )

static

Definition at line 209 of file cpu.c.

{
    CpuUnsimulate();
}

Referenced by CpuInitialize().

Variable Documentation

CpuCallLevel

INT CpuCallLevel = 0

static

Definition at line 44 of file cpu.c.

Referenced by CpuSimulate().

CpuRunning

BOOLEAN CpuRunning = FALSE

Definition at line 40 of file cpu.c.

Referenced by ClockUpdate(), CpuSimulate(), and CpuUnsimulate().

EmulatorContext

FAST486_STATE EmulatorContext

Definition at line 39 of file cpu.c.

Referenced by CpuExceptionFilter(), CpuExecute(), CpuInitialize(), CpuStep(), DmaRequest(), DosReadFile(), DosWriteFile(), EmulatorException(), EmulatorInterruptSignal(), EraseMouseCursor(), getAF(), getAH(), getAL(), getAX(), getBH(), getBL(), getBP(), getBX(), getCF(), getCH(), getCL(), getCS(), getCX(), getDF(), getDH(), getDI(), getDL(), getDS(), getDX(), getEAX(), getEBP(), getEBX(), getECX(), getEDI(), getEDX(), getEFLAGS(), getEIP(), getES(), getESI(), getESP(), getFS(), getGS(), getIF(), getIntelRegistersPointer(), getIP(), getMSW(), getOF(), getPF(), getSF(), getSI(), getSP(), getSS(), getZF(), PaintMouseCursor(), ReadDisk(), setAF(), setAH(), setAL(), setAX(), setBH(), setBL(), setBP(), setBX(), setCF(), setCH(), setCL(), setCS(), setCX(), setDF(), setDH(), setDI(), setDL(), setDS(), setDX(), setEAX(), setEBP(), setEBX(), setECX(), setEDI(), setEDX(), setEFLAGS(), setES(), setESI(), setESP(), setFS(), setGS(), setIF(), setMSW(), setOF(), setPF(), setSF(), setSI(), setSP(), setSS(), setZF(), VidBiosClearScreen(), VidBiosDrawGlyph(), VidBiosScrollWindow(), VidBiosVideoService(), WriteDisk(), and x86BiosCall().

MaxCpuCallLevel

const INT MaxCpuCallLevel = 32

static

Definition at line 43 of file cpu.c.

Referenced by CpuSimulate().