cpu.cpp

/*
 * Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
 *
 * (c) Copyright 1996 - 2001 Gary Henderson (gary.henderson@ntlworld.com) and
 *                           Jerremy Koot (jkoot@snes9x.com)
 *
 * Super FX C emulator code 
 * (c) Copyright 1997 - 1999 Ivar (ivar@snes9x.com) and
 *                           Gary Henderson.
 * Super FX assembler emulator code (c) Copyright 1998 zsKnight and _Demo_.
 *
 * DSP1 emulator code (c) Copyright 1998 Ivar, _Demo_ and Gary Henderson.
 * C4 asm and some C emulation code (c) Copyright 2000 zsKnight and _Demo_.
 * C4 C code (c) Copyright 2001 Gary Henderson (gary.henderson@ntlworld.com).
 *
 * DOS port code contains the works of other authors. See headers in
 * individual files.
 *
 * Snes9x homepage: http://www.snes9x.com
 *
 * Permission to use, copy, modify and distribute Snes9x in both binary and
 * source form, for non-commercial purposes, is hereby granted without fee,
 * providing that this license information and copyright notice appear with
 * all copies and any derived work.
 *
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event shall the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Snes9x is freeware for PERSONAL USE only. Commercial users should
 * seek permission of the copyright holders first. Commercial use includes
 * charging money for Snes9x or software derived from Snes9x.
 *
 * The copyright holders request that bug fixes and improvements to the code
 * should be forwarded to them so everyone can benefit from the modifications
 * in future versions.
 *
 * Super NES and Super Nintendo Entertainment System are trademarks of
 * Nintendo Co., Limited and its subsidiary companies.
 */
#include "snes9x.h"
#include "memmap.h"
#include "ppu.h"
#include "dsp1.h"
#include "cpuexec.h"
#include "debug.h"
#include "apu.h"
#include "dma.h"
#include "sa1.h"
#include "psp/counter.h"
#include "bsx.h"

extern "C" {
#include "cheats.h"
}

#include "srtc.h"
#include "sdd1.h"
#include "spc7110.h"

#ifndef ZSNES_FX
#include "fxemu.h"

extern struct FxInit_s SuperFX;

void S9xResetSuperFX ()
{
    SuperFX.vFlags = 0; //FX_FLAG_ROM_BUFFER;// | FX_FLAG_ADDRESS_CHECKING;
    FxReset (&SuperFX);
}
#endif

void S9xResetCPU ()
{		
    CPUPack.Registers.PB = 0;
    CPUPack.Registers.PC = S9xGetWord (0xFFFC);
    CPUPack.Registers.D.W = 0;
    CPUPack.Registers.DB = 0;
    CPUPack.Registers.SH = 1;
    CPUPack.Registers.SL = 0xFF;
    CPUPack.Registers.XH = 0;
    CPUPack.Registers.YH = 0;
    CPUPack.Registers.P.W = 0;

    CPUPack.ICPU.ShiftedPB = 0;
    CPUPack.ICPU.ShiftedDB = 0;
    SetFlags (MemoryFlag | IndexFlag | IRQ | Emulation);
    ClearFlags (Decimal);

    CPUPack.CPU.Flags = CPUPack.CPU.Flags & (DEBUG_MODE_FLAG | TRACE_FLAG);
    CPUPack.CPU.BranchSkip = FALSE;
    CPUPack.CPU.NMIActive = FALSE;
    CPUPack.CPU.IRQActive = FALSE;
    CPUPack.CPU.WaitingForInterrupt = FALSE;
    CPUPack.CPU.InDMA = FALSE;
    CPUPack.CPU.WhichEvent = HBLANK_START_EVENT;
    S9x_Current_HBlank_Event=S9xDoHBlankProcessing_HBLANK_START_EVENT;
    
    CPUPack.CPU.PC = NULL;
    CPUPack.CPU.PCBase = NULL;
    CPUPack.CPU.PCAtOpcodeStart = NULL;
    CPUPack.CPU.WaitAddress = NULL;
    CPUPack.CPU.WaitCounter = 0;
    CPUPack.CPU.Cycles = 0;
    old_cpu_cycles=0;
    cpu_glob_cycles=0;
    
    CPUPack.CPU.NextEvent = Settings.HBlankStart;
    CPUPack.CPU.V_Counter = 0;
    CPUPack.CPU.MemSpeed = SLOW_ONE_CYCLE;
    CPUPack.CPU.MemSpeedx2 = SLOW_ONE_CYCLE * 2;
    CPUPack.CPU.FastROMSpeed = SLOW_ONE_CYCLE;
    CPUPack.CPU.AutoSaveTimer = 0;
    CPUPack.CPU.SRAMModified = FALSE;
    // CPUPack.CPU.NMITriggerPoint = 4; // Set when ROM image loaded
    CPUPack.CPU.BRKTriggered = FALSE;
    //CPUPack.CPU.TriedInterleavedMode2 = FALSE; // Reset when ROM image loaded
    CPUPack.CPU.NMICycleCount = 0;
    CPUPack.CPU.IRQCycleCount = 0;
    S9xSetPCBase (CPUPack.Registers.PC);

#ifndef VAR_CYCLES
    CPUPack.ICPU.Speed = S9xE1M1X1;
#endif
    CPUPack.ICPU.S9xOpcodes = S9xOpcodesM1X1;
    CPUPack.ICPU.CPUExecuting = TRUE;

    S9xUnpackStatus();
}

#ifdef ZSNES_FX
START_EXTERN_C
void S9xResetSuperFX ();
bool8 WinterGold = 0;
extern uint8 *C4Ram;
END_EXTERN_C
#endif
void debug_dump(const char* filename);
//int msgBoxLines(char* msg,int delay);
void S9xReset (void)
{
	//	msgBoxLines("S9xReset called",80);	
	MyCounter_Init();
	S9xResumeSoundProcess();
	S9xSuspendSoundProcess();
#ifdef _BSX_151_
	if (Settings.BS)//add azz 080517
		S9xResetBSX();
#endif

    if (Settings.SuperFX)
        S9xResetSuperFX ();

#ifdef ZSNES_FX
    WinterGold = Settings.WinterGold;
#endif
    ZeroMemory (ROM_GLOBAL, 0x8000);
    memset (VRAM, 0x00, 0x10000);
    memset (RAM, 0x55, 0x20000);

	if (Settings.SPC7110)
		S9xResetSPC7110();
    S9xResetCPU ();
    S9xResetPPU ();
	if (Settings.SRTC)
		S9xResetSRTC ();
    if (Settings.SDD1)
        S9xResetSDD1 ();

    S9xResetDMA ();
    S9xResetAPU ();
    S9xResetDSP1 ();
    S9xSA1Init ();
    if (Settings.C4)
        S9xInitC4 ();
    S9xInitCheatData ();

    Settings.Paused = FALSE;
    
        //Init CPU Map & co
    CPUPack.CPU.Memory_Map=(uint8*)Map;
    CPUPack.CPU.Memory_WriteMap=(uint8*)Memory.WriteMap;
    CPUPack.CPU.Memory_MemorySpeed=(uint8*)Memory.MemorySpeed;
    CPUPack.CPU.Memory_BlockIsRAM=(uint8*)Memory.BlockIsRAM;
//    CPUPack.CPU.Memory_SRAM=SRAM;
    CPUPack.CPU.Memory_BWRAM=BWRAM;
    CPUPack.CPU.Memory_SRAMMask=Memory.SRAMMask;
	
/*    __asm 
    {
    	LDR 	R0, = CPU
  	    ADD		R0,R0,R10
  		STR	 	R9,[R0,#124]
  		STR	 	R10,[R0,#128]
    } 
	*/
}