memmap.cpp

SFC游戏模拟器 snes9x 1.43 的原代码

/*******************************************************************************
  Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
 
  (c) Copyright 1996 - 2002 Gary Henderson ([e-mail]) and
                            Jerremy Koot ([e-mail])

  (c) Copyright 2001 - 2004 John Weidman ([e-mail])

  (c) Copyright 2002 - 2004 Brad Jorsch ([e-mail]),
                            funkyass ([e-mail]),
                            Joel Yliluoma (http://iki.fi/bisqwit/)
                            Kris Bleakley ([e-mail]),
                            Matthew Kendora,
                            Nach ([e-mail]),
                            Peter Bortas ([e-mail]) and
                            zones ([e-mail])

  C4 x86 assembler and some C emulation code
  (c) Copyright 2000 - 2003 zsKnight ([e-mail]),
                            _Demo_ ([e-mail]), and Nach

  C4 C++ code
  (c) Copyright 2003 Brad Jorsch

  DSP-1 emulator code
  (c) Copyright 1998 - 2004 Ivar ([e-mail]), _Demo_, Gary Henderson,
                            John Weidman, neviksti ([e-mail]),
                            Kris Bleakley, Andreas Naive

  DSP-2 emulator code
  (c) Copyright 2003 Kris Bleakley, John Weidman, neviksti, Matthew Kendora, and
                     Lord Nightmare ([e-mail]

  OBC1 emulator code
  (c) Copyright 2001 - 2004 zsKnight, pagefault ([e-mail]) and
                            Kris Bleakley
  Ported from x86 assembler to C by sanmaiwashi

  SPC7110 and RTC C++ emulator code
  (c) Copyright 2002 Matthew Kendora with research by
                     zsKnight, John Weidman, and Dark Force

  S-DD1 C emulator code
  (c) Copyright 2003 Brad Jorsch with research by
                     Andreas Naive and John Weidman
 
  S-RTC C emulator code
  (c) Copyright 2001 John Weidman
  
  ST010 C++ emulator code
  (c) Copyright 2003 Feather, Kris Bleakley, John Weidman and Matthew Kendora

  Super FX x86 assembler emulator code 
  (c) Copyright 1998 - 2003 zsKnight, _Demo_, and pagefault 

  Super FX C emulator code 
  (c) Copyright 1997 - 1999 Ivar, Gary Henderson and John Weidman


  SH assembler code partly based on x86 assembler code
  (c) Copyright 2002 - 2004 Marcus Comstedt ([e-mail]) 

 
  Specific ports 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 <string.h>
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#include <ctype.h>

#ifdef __linux
#include <unistd.h>
#endif

#ifdef JMA_SUPPORT
#include "jma/s9x-jma.h"
#endif

#include "snes9x.h"
#include "memmap.h"
#include "cpuexec.h"
#include "ppu.h"
#include "display.h"
#include "cheats.h"
#include "apu.h"
#include "sa1.h"
#include "dsp1.h"
#include "srtc.h"
#include "sdd1.h"
#include "spc7110.h"
#include "seta.h"

#include "unzip.h"

#ifdef __W32_HEAP
#include <malloc.h>
#endif

#ifndef ZSNES_FX
#include "fxemu.h"
extern struct FxInit_s SuperFX;
#else
START_EXTERN_C
extern uint8 *SFXPlotTable;
END_EXTERN_C
#endif

#ifndef SET_UI_COLOR
#define SET_UI_COLOR(r,g,b) ;
#endif

//you would think everyone would have these
//since they're so useful.
#ifndef max
#define max(a,b)            (((a) > (b)) ? (a) : (b))
#endif

#ifndef min
#define min(a,b)            (((a) < (b)) ? (a) : (b))
#endif

static int retry_count=0;
static uint8 bytes0x2000 [0x2000];
int is_bsx(unsigned char *);
int bs_name(unsigned char *);
int check_char(unsigned);
void S9xDeinterleaveType2 (bool8 reset=TRUE);
inline uint32 caCRC32(uint8 *array, uint32 size, register uint32 crc32 = 0xFFFFFFFF);

extern char *rom_filename;

const uint32 crc32Table[256] = {
  0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
  0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
  0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
  0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
  0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
  0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
  0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
  0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
  0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
  0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
  0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
  0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
  0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
  0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
  0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
  0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
  0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
  0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
  0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
  0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
  0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
  0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
  0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
  0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
  0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
  0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
  0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
  0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
  0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
  0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
  0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
  0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
  0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
  0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
  0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
  0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
  0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
  0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
  0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
  0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
  0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
  0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
  0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
};



void S9xDeinterleaveType1(int TotalFileSize, uint8 * base)
{
	if(Settings.DisplayColor==0xffff)
	{
		Settings.DisplayColor=BUILD_PIXEL(0,31,0);
		SET_UI_COLOR(0,255,0);
	}

	int i;
	int nblocks = TotalFileSize >> 16;
	uint8 blocks [256];
	for (i = 0; i < nblocks; i++)
	{
		blocks [i * 2] = i + nblocks;
		blocks [i * 2 + 1] = i;
	}
	uint8 *tmp = (uint8 *) malloc (0x8000);
	if (tmp)
	{
		for (i = 0; i < nblocks * 2; i++)
		{
			for (int j = i; j < nblocks * 2; j++)
			{
				if (blocks [j] == i)
				{
					memmove (tmp, &base [blocks [j] * 0x8000], 0x8000);
					memmove (&base [blocks [j] * 0x8000], 
						&base [blocks [i] * 0x8000], 0x8000);
					memmove (&base [blocks [i] * 0x8000], tmp, 0x8000);
					uint8 b = blocks [j];
					blocks [j] = blocks [i];
					blocks [i] = b;
					break;
				}
			}
		}
		free ((char *) tmp);
	}
}

void S9xDeinterleaveGD24(int TotalFileSize, uint8 * base)
{

	if(TotalFileSize!=0x300000)
		return;

	if(Settings.DisplayColor==0xffff)
	{
		Settings.DisplayColor=BUILD_PIXEL(0,31,31);
		SET_UI_COLOR(0,255,255);
	}

	uint8 *tmp = (uint8 *) malloc (0x80000);
	if (tmp)
	{
		memmove(tmp, &base[0x180000], 0x80000);
		memmove(&base[0x180000], &base[0x200000], 0x80000);
		memmove(&base[0x200000], &base[0x280000], 0x80000);
		memmove(&base[0x280000], tmp, 0x80000);
		free ((char *) tmp);

		S9xDeinterleaveType1(TotalFileSize, base);
	}
}

bool8 CMemory::AllASCII (uint8 *b, int size)
{
    for (int i = 0; i < size; i++)
    {
		if (b[i] < 32 || b[i] > 126)
			return (FALSE);
    }
    return (TRUE);
}

int CMemory::ScoreHiROM (bool8 skip_header, int32 romoff)
{
    int score = 0;
    int o = skip_header ? 0xff00 + 0x200 : 0xff00;
	
	o+=romoff;

	if(Memory.ROM [o + 0xd5] & 0x1)
		score+=2;

	//Mode23 is SA-1
	if(Memory.ROM [o + 0xd5] == 0x23)
		score-=2;

	if(Memory.ROM [o+0xd4] == 0x20)
		score +=2;

    if ((Memory.ROM [o + 0xdc] + (Memory.ROM [o + 0xdd] << 8) +
		Memory.ROM [o + 0xde] + (Memory.ROM [o + 0xdf] << 8)) == 0xffff)
	{
		score += 2;
		if(0!=(Memory.ROM [o + 0xde] + (Memory.ROM [o + 0xdf] << 8)))
			score++;
	}
	
    if (Memory.ROM [o + 0xda] == 0x33)
		score += 2;
    if ((Memory.ROM [o + 0xd5] & 0xf) < 4)
		score += 2;
    if (!(Memory.ROM [o + 0xfd] & 0x80))
		score -= 6;
    if ((Memory.ROM [o + 0xfc]|(Memory.ROM [o + 0xfd]<<8))>0xFFB0)
		score -= 2; //reduced after looking at a scan by Cowering
    if (CalculatedSize > 1024 * 1024 * 3)
		score += 4;
    if ((1 << (Memory.ROM [o + 0xd7] - 7)) > 48)
		score -= 1;
    if (!AllASCII (&Memory.ROM [o + 0xb0], 6))
		score -= 1;
    if (!AllASCII (&Memory.ROM [o + 0xc0], ROM_NAME_LEN - 1))
		score -= 1;
	
    return (score);
}	

int CMemory::ScoreLoROM (bool8 skip_header, int32 romoff)
{
    int score = 0;
    int o = skip_header ? 0x7f00 + 0x200 : 0x7f00;
	
	o+=romoff;

	if(!(Memory.ROM [o + 0xd5] & 0x1))
		score+=3;

	//Mode23 is SA-1
	if(Memory.ROM [o + 0xd5] == 0x23)
		score+=2;

    if ((Memory.ROM [o + 0xdc] + (Memory.ROM [o + 0xdd] << 8) +
		Memory.ROM [o + 0xde] + (Memory.ROM [o + 0xdf] << 8)) == 0xffff)
	{
		score += 2;
		if(0!=(Memory.ROM [o + 0xde] + (Memory.ROM [o + 0xdf] << 8)))
			score++;
	}
	
    if (Memory.ROM [o + 0xda] == 0x33)
		score += 2;
    if ((Memory.ROM [o + 0xd5] & 0xf) < 4)
		score += 2;
    if (CalculatedSize <= 1024 * 1024 * 16)
		score += 2;
    if (!(Memory.ROM [o + 0xfd] & 0x80))
		score -= 6;
	if ((Memory.ROM [o + 0xfc]|(Memory.ROM [o + 0xfd]<<8))>0xFFB0)
		score -= 2;//reduced per Cowering suggestion
    if ((1 << (Memory.ROM [o + 0xd7] - 7)) > 48)
		score -= 1;
    if (!AllASCII (&Memory.ROM [o + 0xb0], 6))
		score -= 1;
    if (!AllASCII (&Memory.ROM [o + 0xc0], ROM_NAME_LEN - 1))
		score -= 1;
	
    return (score);
}

char *CMemory::Safe (const char *s)
{
    static char *safe;
    static int safe_len = 0;

	if(s==NULL)
	{
		if(safe!=NULL)
		{
			free((char*)safe);
			safe = NULL;
		}
		return NULL;
	}
    int len = strlen (s);
    if (!safe || len + 1 > safe_len)
    {
		if (safe)
			free ((char *) safe);
		safe = (char *) malloc (safe_len = len + 1);
    }
	
    for (int i = 0; i < len; i++)
    {
		if (s [i] >= 32 && s [i] < 127)
			safe [i] = s[i];
		else
			safe [i] = '?';
    }
    safe [len] = 0;
    return (safe);
}

/**********************************************************************************************/
/* Init()                                                                                     */
/* This function allocates all the memory needed by the emulator                              */
/**********************************************************************************************/
bool8 CMemory::Init ()
{
    RAM	    = (uint8 *) malloc (0x20000);
    SRAM    = (uint8 *) malloc (0x20000);
    VRAM    = (uint8 *) malloc (0x10000);
    ROM     = (uint8 *) malloc (MAX_ROM_SIZE + 0x200 + 0x8000);
	memset (RAM, 0, 0x20000);
	memset (SRAM, 0, 0x20000);
	memset (VRAM, 0, 0x10000);
	memset (ROM, 0, MAX_ROM_SIZE + 0x200 + 0x8000);
    
	BSRAM	= (uint8 *) malloc (0x80000);
	memset (BSRAM, 0, 0x80000);

	FillRAM = NULL;
	
    IPPU.TileCache [TILE_2BIT] = (uint8 *) malloc (MAX_2BIT_TILES * 128);
    IPPU.TileCache [TILE_4BIT] = (uint8 *) malloc (MAX_4BIT_TILES * 128);
    IPPU.TileCache [TILE_8BIT] = (uint8 *) malloc (MAX_8BIT_TILES * 128);
    
    IPPU.TileCached [TILE_2BIT] = (uint8 *) malloc (MAX_2BIT_TILES);
    IPPU.TileCached [TILE_4BIT] = (uint8 *) malloc (MAX_4BIT_TILES);
    IPPU.TileCached [TILE_8BIT] = (uint8 *) malloc (MAX_8BIT_TILES);
    
    if (!RAM || !SRAM || !VRAM || !ROM || !BSRAM ||
        !IPPU.TileCache [TILE_2BIT] || !IPPU.TileCache [TILE_4BIT] ||
		!IPPU.TileCache [TILE_8BIT] || !IPPU.TileCached [TILE_2BIT] ||
		!IPPU.TileCached [TILE_4BIT] ||	!IPPU.TileCached [TILE_8BIT])
    {
		Deinit ();
		return (FALSE);
    }
	
    // FillRAM uses first 32K of ROM image area, otherwise space just
    // wasted. Might be read by the SuperFX code.
	
    FillRAM = ROM;
	
    // Add 0x8000 to ROM image pointer to stop SuperFX code accessing
    // unallocated memory (can cause crash on some ports).
    ROM += 0x8000;
	
    C4RAM    = ROM + 0x400000 + 8192 * 8;
    ::ROM    = ROM;
    ::SRAM   = SRAM;
    ::RegRAM = FillRAM;
	
#ifdef ZSNES_FX
    SFXPlotTable = ROM + 0x400000;
#else
    SuperFX.pvRegisters = &Memory.FillRAM [0x3000];
    SuperFX.nRamBanks = 2;	// Most only use 1.  1=64KB, 2=128KB=1024Mb
    SuperFX.pvRam = ::SRAM;
    SuperFX.nRomBanks = (2 * 1024 * 1024) / (32 * 1024);
    SuperFX.pvRom = (uint8 *) ROM;
#endif
	
    ZeroMemory (IPPU.TileCache [TILE_2BIT], MAX_2BIT_TILES * 128);
    ZeroMemory (IPPU.TileCache [TILE_4BIT], MAX_4BIT_TILES * 128);
    ZeroMemory (IPPU.TileCache [TILE_8BIT], MAX_8BIT_TILES * 128);

    ZeroMemory (IPPU.TileCached [TILE_2BIT], MAX_2BIT_TILES);
    ZeroMemory (IPPU.TileCached [TILE_4BIT], MAX_4BIT_TILES);
    ZeroMemory (IPPU.TileCached [TILE_8BIT], MAX_8BIT_TILES);
    
    SDD1Data = NULL;
    SDD1Index = NULL;
	
    return (TRUE);
}

void CMemory::Deinit ()
{
#ifdef __W32_HEAP
	if(_HEAPOK!=_heapchk())
		MessageBox(GUI.hWnd, "CMemory::Deinit", "Heap Corrupt", MB_OK);
#endif

    if (RAM)
    {
		free ((char *) RAM);
		RAM = NULL;
    }
    if (SRAM)
    {
		free ((char *) SRAM);
		SRAM = NULL;
    }
    if (VRAM)
    {
		free ((char *) VRAM);
		VRAM = NULL;
    }
    if (ROM)
    {
		ROM -= 0x8000;
		free ((char *) ROM);
		ROM = NULL;
    }
	
	if(BSRAM)
	{
		free((char*) BSRAM);
		BSRAM=NULL;
	}

    if (IPPU.TileCache [TILE_2BIT])
    {
		free ((char *) IPPU.TileCache [TILE_2BIT]);
		IPPU.TileCache [TILE_2BIT] = NULL;
    }
    if (IPPU.TileCache [TILE_4BIT])
    {
		free ((char *) IPPU.TileCache [TILE_4BIT]);
		IPPU.TileCache [TILE_4BIT] = NULL;
    }
    if (IPPU.TileCache [TILE_8BIT])
    {
		free ((char *) IPPU.TileCache [TILE_8BIT]);
		IPPU.TileCache [TILE_8BIT] = NULL;
    }
	
    if (IPPU.TileCached [TILE_2BIT])
    {
		free ((char *) IPPU.TileCached [TILE_2BIT]);
		IPPU.TileCached [TILE_2BIT] = NULL;
    }
    if (IPPU.TileCached [TILE_4BIT])
    {
		free ((char *) IPPU.TileCached [TILE_4BIT]);
		IPPU.TileCached [TILE_4BIT] = NULL;
    }
    if (IPPU.TileCached [TILE_8BIT])
    {
		free ((char *) IPPU.TileCached [TILE_8BIT]);
		IPPU.TileCached [TILE_8BIT] = NULL;
    }
    FreeSDD1Data ();
	Safe(NULL);