psxmem.c

/***************************************************************************
 *   Copyright (C) 2007 Ryan Schultz, PCSX-df Team, PCSX team              *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.           *
 ***************************************************************************/

/*  Playstation Memory Map (from Playstation doc by Joshua Walker)
0x0000_0000-0x0000_ffff		Kernel (64K)	
0x0001_0000-0x001f_ffff		User Memory (1.9 Meg)	
		
0x1f00_0000-0x1f00_ffff		Parallel Port (64K)	
		
0x1f80_0000-0x1f80_03ff		Scratch Pad (1024 bytes)	
		
0x1f80_1000-0x1f80_2fff		Hardware Registers (8K)	
		
0x8000_0000-0x801f_ffff		Kernel and User Memory Mirror (2 Meg) Cached	
		
0xa000_0000-0xa01f_ffff		Kernel and User Memory Mirror (2 Meg) Uncached	
		
0xbfc0_0000-0xbfc7_ffff		BIOS (512K)
*/
 
/*
* PSX memory functions.
*/

/* Ryan TODO: I'd rather not use GLib in here */

#include <malloc.h>
#include <gccore.h>
#include <stdlib.h>
#include "psxmem.h"
#include "r3000a.h"
#include "psxhw.h"
#include "Gamecube/fileBrowser/fileBrowser.h"
#include "Gamecube/fileBrowser/fileBrowser-libfat.h"
#include "Gamecube/fileBrowser/fileBrowser-CARD.h"
#include "Gamecube/fileBrowser/fileBrowser-DVD.h"
#include "Gamecube/wiiSXconfig.h"

extern void SysMessage(char *fmt, ...);

s8 psxM[0x00220000] __attribute__((aligned(32)));
s8 psxR[0x00080000] __attribute__((aligned(32)));
u8* psxMemWLUT[0x10000] __attribute__((aligned(32)));
u8* psxMemRLUT[0x10000] __attribute__((aligned(32)));

int psxMemInit() {
	int i;

	//psxMemRLUT = (u8**)memalign(32,0x10000 * sizeof(void*));
	//psxMemWLUT = (u8**)memalign(32,0x10000 * sizeof(void*));
	memset(psxMemRLUT, 0, 0x10000 * sizeof(void*));
	memset(psxMemWLUT, 0, 0x10000 * sizeof(void*));
	//psxM = memalign(32,0x00220000);
	psxP = &psxM[0x200000];
	psxH = &psxM[0x210000];
	//psxR = (s8*)memalign(32,0x00080000);
	/*if (psxMemRLUT == NULL || psxMemWLUT == NULL || 
		psxM == NULL || psxP == NULL || psxH == NULL) {
		SysMessage(_("Error allocating memory!")); return -1;
	}*/

// MemR
	for (i=0; i<0x80; i++) psxMemRLUT[i + 0x0000] = (u8*)&psxM[(i & 0x1f) << 16];
	
	memcpy(psxMemRLUT + 0x8000, psxMemRLUT, 0x80 * sizeof(void*));
	memcpy(psxMemRLUT + 0xa000, psxMemRLUT, 0x80 * sizeof(void*));

	for (i=0; i<0x01; i++) psxMemRLUT[i + 0x1f00] = (u8*)&psxP[i << 16];

	for (i=0; i<0x01; i++) psxMemRLUT[i + 0x1f80] = (u8*)&psxH[i << 16];

	for (i=0; i<0x08; i++) psxMemRLUT[i + 0xbfc0] = (u8*)&psxR[i << 16];

// MemW
	for (i=0; i<0x80; i++) psxMemWLUT[i + 0x0000] = (u8*)&psxM[(i & 0x1f) << 16];
	memcpy(psxMemWLUT + 0x8000, psxMemWLUT, 0x80 * sizeof(void*));
	memcpy(psxMemWLUT + 0xa000, psxMemWLUT, 0x80 * sizeof(void*));

	for (i=0; i<0x01; i++) psxMemWLUT[i + 0x1f00] = (u8*)&psxP[i << 16];

	for (i=0; i<0x01; i++) psxMemWLUT[i + 0x1f80] = (u8*)&psxH[i << 16];

	return 0;
}

void psxMemReset() {
  //printf("BIOS file %s\n",biosFile->name);
  int temp;
	memset(psxM, 0, 0x00200000);
	memset(psxP, 0, 0x00010000);
  memset(psxR, 0, 0x80000);
  if(!biosFile || (biosDevice == BIOSDEVICE_HLE)) {
    Config.HLE = BIOS_HLE;
    return;
  }
  else {
    biosFile->offset = 0; //must reset otherwise the if statement will fail!
  	if(biosFile_readFile(biosFile, &temp, 4) == 4) {  //bios file exists
  	  biosFile->offset = 0;
  		if(biosFile_readFile(biosFile, psxR, 0x80000) != 0x80000) { //failed size
  		  //printf("Using HLE\n");
  		  Config.HLE = BIOS_HLE;
  	  }
  		else {
    		//printf("Using BIOS file %s\n",biosFile->name);
  		  Config.HLE = BIOS_USER_DEFINED;
  	  }
  	}
  	else {  //bios fails to open
    	Config.HLE = BIOS_HLE;
  	}
	}
}

void psxMemShutdown() {
/*	free(psxM);
	free(psxR);
	free(psxMemRLUT);
	free(psxMemWLUT);*/
}

static int writeok=1;

u8 psxMemRead8(u32 mem) {
	u32 t;

	t = mem >> 16;
	if (t == 0x1f80) {
		if (mem < 0x1f801000)
			return psxHu8(mem);
		else
			return psxHwRead8(mem);
	} else {
		char *p = (char *)(psxMemRLUT[t]);
		if (p != NULL) {
			return *(u8 *)(p + (mem & 0xffff));
		} else {
#ifdef PSXMEM_LOG
			PSXMEM_LOG("err lb %8.8lx\n", mem);
#endif
			return 0;
		}
	}
}

u16 psxMemRead16(u32 mem) {
	u32 t;

	t = mem >> 16;
	if (t == 0x1f80) {
		if (mem < 0x1f801000)
			return psxHu16(mem);
		else
			return psxHwRead16(mem);
	} else {
		char *p = (char *)(psxMemRLUT[t]);
		if (p != NULL) {
			return SWAPu16(*(u16 *)(p + (mem & 0xffff)));
		} else {
#ifdef PSXMEM_LOG
			PSXMEM_LOG("err lh %8.8lx\n", mem);
#endif
			return 0;
		}
	}
}

u32 psxMemRead32(u32 mem) {
	u32 t;

	t = mem >> 16;
	if (t == 0x1f80) {
		if (mem < 0x1f801000)
			return psxHu32(mem);
		else
			return psxHwRead32(mem);
	} else {
		char *p = (char *)(psxMemRLUT[t]);
		if (p != NULL) {
			return SWAPu32(*(u32 *)(p + (mem & 0xffff)));
		} else {
#ifdef PSXMEM_LOG
			if (writeok) { PSXMEM_LOG("err lw %8.8lx\n", mem); }
#endif
			return 0;
		}
	}
}

void psxMemWrite8(u32 mem, u8 value) {
	u32 t;

	t = mem >> 16;
	if (t == 0x1f80) {
		if (mem < 0x1f801000)
			psxHu8(mem) = value;
		else
			psxHwWrite8(mem, value);
	} else {
		char *p = (char *)(psxMemWLUT[t]);
		if (p != NULL) {
			*(u8  *)(p + (mem & 0xffff)) = value;
#ifdef PSXREC
			psxCpu->Clear((mem&(~3)), 1);
#endif
		} else {
#ifdef PSXMEM_LOG
			PSXMEM_LOG("err sb %8.8lx\n", mem);
#endif
		}
	}
}

void psxMemWrite16(u32 mem, u16 value) {
	u32 t;

	t = mem >> 16;
	if (t == 0x1f80) {
		if (mem < 0x1f801000)
			psxHu16ref(mem) = SWAPu16(value);
		else
			psxHwWrite16(mem, value);
	} else {
		char *p = (char *)(psxMemWLUT[t]);
		if (p != NULL) {
			*(u16 *)(p + (mem & 0xffff)) = SWAPu16(value);
#ifdef PSXREC
			psxCpu->Clear((mem&(~1)), 1);
#endif
		} else {
#ifdef PSXMEM_LOG
			PSXMEM_LOG("err sh %8.8lx\n", mem);
#endif
		}
	}
}

void psxMemWrite32(u32 mem, u32 value) {
	u32 t;

//	if ((mem&0x1fffff) == 0x71E18 || value == 0x48088800) SysPrintf("t2fix!!\n");
	t = mem >> 16;
	if (t == 0x1f80) {
		if (mem < 0x1f801000)
			psxHu32ref(mem) = SWAPu32(value);
		else
			psxHwWrite32(mem, value);
	} else {
		char *p = (char *)(psxMemWLUT[t]);
		if (p != NULL) {
			*(u32 *)(p + (mem & 0xffff)) = SWAPu32(value);
#ifdef PSXREC
			psxCpu->Clear(mem, 1);
#endif
		} else {
			if (mem != 0xfffe0130) {
#ifdef PSXREC
				if (!writeok)
					psxCpu->Clear(mem, 1);
#endif

#ifdef PSXMEM_LOG
				if (writeok) { PSXMEM_LOG("err sw %8.8lx\n", mem); }
#endif
			} else {
				int i;

				switch (value) {
					case 0x800: case 0x804:
						if (writeok == 0) break;
						writeok = 0;
						memset(psxMemWLUT + 0x0000, 0, 0x80 * sizeof(void*));
						memset(psxMemWLUT + 0x8000, 0, 0x80 * sizeof(void*));
						memset(psxMemWLUT + 0xa000, 0, 0x80 * sizeof(void*));
						break;
					case 0x1e988:
						if (writeok == 1) break;
						writeok = 1;
						for (i=0; i<0x80; i++) psxMemWLUT[i + 0x0000] = (void*)&psxM[(i & 0x1f) << 16];
						memcpy(psxMemWLUT + 0x8000, psxMemWLUT, 0x80 * sizeof(void*));
						memcpy(psxMemWLUT + 0xa000, psxMemWLUT, 0x80 * sizeof(void*));
						break;
					default:
#ifdef PSXMEM_LOG
						PSXMEM_LOG("unk %8.8lx = %x\n", mem, value);
#endif
						break;
				}
			}
		}
	}
}

void *psxMemPointer(u32 mem) {
	u32 t;

	t = mem >> 16;
	if (t == 0x1f80) {
		if (mem < 0x1f801000)
			return (void *)&psxH[mem];
		else
			return NULL;
	} else {
		char *p = (char *)(psxMemWLUT[t]);
		if (p != NULL) {
			return (void *)(p + (mem & 0xffff));
		}
		return NULL;
	}
}