libpcsxcore/psxmem.c

   1 /***************************************************************************
   2  *   Copyright (C) 2007 Ryan Schultz, PCSX-df Team, PCSX team              *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   51 Franklin Street, Fifth Floor, Boston, MA 02111-1307 USA.           *
  18  ***************************************************************************/
  19
  20 /*
  21 * PSX memory functions.
  22 */
  23
  24 // TODO: Implement caches & cycle penalty.
  25
  26 #include "psxmem.h"
  27 #include "r3000a.h"
  28 #include "psxhw.h"
  29 #include <sys/mman.h>
  30
  31 #ifndef MAP_ANONYMOUS
  32 #define MAP_ANONYMOUS MAP_ANON
  33 #endif
  34
  35 s8 *psxM = NULL; // Kernel & User Memory (2 Meg)
  36 s8 *psxP = NULL; // Parallel Port (64K)
  37 s8 *psxR = NULL; // BIOS ROM (512K)
  38 s8 *psxH = NULL; // Scratch Pad (1K) & Hardware Registers (8K)
  39
  40 u8 **psxMemWLUT = NULL;
  41 u8 **psxMemRLUT = NULL;
  42
  43 /*  Playstation Memory Map (from Playstation doc by Joshua Walker)
  44 0x0000_0000-0x0000_ffff         Kernel (64K)
  45 0x0001_0000-0x001f_ffff         User Memory (1.9 Meg)
  46
  47 0x1f00_0000-0x1f00_ffff         Parallel Port (64K)
  48
  49 0x1f80_0000-0x1f80_03ff         Scratch Pad (1024 bytes)
  50
  51 0x1f80_1000-0x1f80_2fff         Hardware Registers (8K)
  52
  53 0x1fc0_0000-0x1fc7_ffff         BIOS (512K)
  54
  55 0x8000_0000-0x801f_ffff         Kernel and User Memory Mirror (2 Meg) Cached
  56 0x9fc0_0000-0x9fc7_ffff         BIOS Mirror (512K) Cached
  57
  58 0xa000_0000-0xa01f_ffff         Kernel and User Memory Mirror (2 Meg) Uncached
  59 0xbfc0_0000-0xbfc7_ffff         BIOS Mirror (512K) Uncached
  60 */
  61
  62 int psxMemInit() {
  63         int i;
  64
  65         psxMemRLUT = (u8 **)malloc(0x10000 * sizeof(void *));
  66         psxMemWLUT = (u8 **)malloc(0x10000 * sizeof(void *));
  67         memset(psxMemRLUT, 0, 0x10000 * sizeof(void *));
  68         memset(psxMemWLUT, 0, 0x10000 * sizeof(void *));
  69
  70         psxM = mmap((void *)0x80000000, 0x00220000,
  71                 PROT_WRITE | PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
  72
  73         psxP = &psxM[0x200000];
  74         psxH = &psxM[0x210000];
  75
  76         psxR = mmap((void *)0x9fc00000, 0x80000,
  77                 PROT_WRITE | PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
  78
  79         if (psxMemRLUT == NULL || psxMemWLUT == NULL ||
  80                 psxM != (void *)0x80000000 || psxR != (void *)0x9fc00000 ||
  81                 psxP == NULL || psxH == NULL) {
  82                 SysMessage(_("Error allocating memory!"));
  83                 return -1;
  84         }
  85
  86 // MemR
  87         for (i = 0; i < 0x80; i++) psxMemRLUT[i + 0x0000] = (u8 *)&psxM[(i & 0x1f) << 16];
  88
  89         memcpy(psxMemRLUT + 0x8000, psxMemRLUT, 0x80 * sizeof(void *));
  90         memcpy(psxMemRLUT + 0xa000, psxMemRLUT, 0x80 * sizeof(void *));
  91
  92         psxMemRLUT[0x1f00] = (u8 *)psxP;
  93         psxMemRLUT[0x1f80] = (u8 *)psxH;
  94
  95         for (i = 0; i < 0x08; i++) psxMemRLUT[i + 0x1fc0] = (u8 *)&psxR[i << 16];
  96
  97         memcpy(psxMemRLUT + 0x9fc0, psxMemRLUT + 0x1fc0, 0x08 * sizeof(void *));
  98         memcpy(psxMemRLUT + 0xbfc0, psxMemRLUT + 0x1fc0, 0x08 * sizeof(void *));
  99
 100 // MemW
 101         for (i = 0; i < 0x80; i++) psxMemWLUT[i + 0x0000] = (u8 *)&psxM[(i & 0x1f) << 16];
 102
 103         memcpy(psxMemWLUT + 0x8000, psxMemWLUT, 0x80 * sizeof(void *));
 104         memcpy(psxMemWLUT + 0xa000, psxMemWLUT, 0x80 * sizeof(void *));
 105
 106         psxMemWLUT[0x1f00] = (u8 *)psxP;
 107         psxMemWLUT[0x1f80] = (u8 *)psxH;
 108
 109         return 0;
 110 }
 111
 112 void psxMemReset() {
 113         FILE *f = NULL;
 114         char bios[1024];
 115
 116         memset(psxM, 0, 0x00200000);
 117         memset(psxP, 0, 0x00010000);
 118
 119         if (strcmp(Config.Bios, "HLE") != 0) {
 120                 sprintf(bios, "%s/%s", Config.BiosDir, Config.Bios);
 121                 f = fopen(bios, "rb");
 122
 123                 if (f == NULL) {
 124                         SysMessage(_("Could not open BIOS:\"%s\". Enabling HLE Bios!\n"), bios);
 125                         memset(psxR, 0, 0x80000);
 126                         Config.HLE = TRUE;
 127                 } else {
 128                         fread(psxR, 1, 0x80000, f);
 129                         fclose(f);
 130                         Config.HLE = FALSE;
 131                 }
 132         } else Config.HLE = TRUE;
 133 }
 134
 135 void psxMemShutdown() {
 136         munmap(psxM, 0x00220000);
 137         munmap(psxR, 0x80000);
 138
 139         free(psxMemRLUT);
 140         free(psxMemWLUT);
 141 }
 142
 143 static int writeok = 1;
 144
 145 u8 psxMemRead8(u32 mem) {
 146         char *p;
 147         u32 t;
 148
 149         t = mem >> 16;
 150         if (t == 0x1f80) {
 151                 if (mem < 0x1f801000)
 152                         return psxHu8(mem);
 153                 else
 154                         return psxHwRead8(mem);
 155         } else {
 156                 p = (char *)(psxMemRLUT[t]);
 157                 if (p != NULL) {
 158                         if (Config.Debug)
 159                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, R1);
 160                         return *(u8 *)(p + (mem & 0xffff));
 161                 } else {
 162 #ifdef PSXMEM_LOG
 163                         PSXMEM_LOG("err lb %8.8lx\n", mem);
 164 #endif
 165                         return 0;
 166                 }
 167         }
 168 }
 169
 170 u16 psxMemRead16(u32 mem) {
 171         char *p;
 172         u32 t;
 173
 174         t = mem >> 16;
 175         if (t == 0x1f80) {
 176                 if (mem < 0x1f801000)
 177                         return psxHu16(mem);
 178                 else
 179                         return psxHwRead16(mem);
 180         } else {
 181                 p = (char *)(psxMemRLUT[t]);
 182                 if (p != NULL) {
 183                         if (Config.Debug)
 184                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, R2);
 185                         return SWAPu16(*(u16 *)(p + (mem & 0xffff)));
 186                 } else {
 187 #ifdef PSXMEM_LOG
 188                         PSXMEM_LOG("err lh %8.8lx\n", mem);
 189 #endif
 190                         return 0;
 191                 }
 192         }
 193 }
 194
 195 u32 psxMemRead32(u32 mem) {
 196         char *p;
 197         u32 t;
 198
 199         t = mem >> 16;
 200         if (t == 0x1f80) {
 201                 if (mem < 0x1f801000)
 202                         return psxHu32(mem);
 203                 else
 204                         return psxHwRead32(mem);
 205         } else {
 206                 p = (char *)(psxMemRLUT[t]);
 207                 if (p != NULL) {
 208                         if (Config.Debug)
 209                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, R4);
 210                         return SWAPu32(*(u32 *)(p + (mem & 0xffff)));
 211                 } else {
 212 #ifdef PSXMEM_LOG
 213                         if (writeok) { PSXMEM_LOG("err lw %8.8lx\n", mem); }
 214 #endif
 215                         return 0;
 216                 }
 217         }
 218 }
 219
 220 void psxMemWrite8(u32 mem, u8 value) {
 221         char *p;
 222         u32 t;
 223
 224         t = mem >> 16;
 225         if (t == 0x1f80) {
 226                 if (mem < 0x1f801000)
 227                         psxHu8(mem) = value;
 228                 else
 229                         psxHwWrite8(mem, value);
 230         } else {
 231                 p = (char *)(psxMemWLUT[t]);
 232                 if (p != NULL) {
 233                         if (Config.Debug)
 234                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, W1);
 235                         *(u8 *)(p + (mem & 0xffff)) = value;
 236 #ifdef PSXREC
 237                         psxCpu->Clear((mem & (~3)), 1);
 238 #endif
 239                 } else {
 240 #ifdef PSXMEM_LOG
 241                         PSXMEM_LOG("err sb %8.8lx\n", mem);
 242 #endif
 243                 }
 244         }
 245 }
 246
 247 void psxMemWrite16(u32 mem, u16 value) {
 248         char *p;
 249         u32 t;
 250
 251         t = mem >> 16;
 252         if (t == 0x1f80) {
 253                 if (mem < 0x1f801000)
 254                         psxHu16ref(mem) = SWAPu16(value);
 255                 else
 256                         psxHwWrite16(mem, value);
 257         } else {
 258                 p = (char *)(psxMemWLUT[t]);
 259                 if (p != NULL) {
 260                         if (Config.Debug)
 261                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, W2);
 262                         *(u16 *)(p + (mem & 0xffff)) = SWAPu16(value);
 263 #ifdef PSXREC
 264                         psxCpu->Clear((mem & (~1)), 1);
 265 #endif
 266                 } else {
 267 #ifdef PSXMEM_LOG
 268                         PSXMEM_LOG("err sh %8.8lx\n", mem);
 269 #endif
 270                 }
 271         }
 272 }
 273
 274 void psxMemWrite32(u32 mem, u32 value) {
 275         char *p;
 276         u32 t;
 277
 278 //      if ((mem&0x1fffff) == 0x71E18 || value == 0x48088800) SysPrintf("t2fix!!\n");
 279         t = mem >> 16;
 280         if (t == 0x1f80) {
 281                 if (mem < 0x1f801000)
 282                         psxHu32ref(mem) = SWAPu32(value);
 283                 else
 284                         psxHwWrite32(mem, value);
 285         } else {
 286                 p = (char *)(psxMemWLUT[t]);
 287                 if (p != NULL) {
 288                         if (Config.Debug)
 289                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, W4);
 290                         *(u32 *)(p + (mem & 0xffff)) = SWAPu32(value);
 291 #ifdef PSXREC
 292                         psxCpu->Clear(mem, 1);
 293 #endif
 294                 } else {
 295                         if (mem != 0xfffe0130) {
 296 #ifdef PSXREC
 297                                 if (!writeok)
 298                                         psxCpu->Clear(mem, 1);
 299 #endif
 300
 301 #ifdef PSXMEM_LOG
 302                                 if (writeok) { PSXMEM_LOG("err sw %8.8lx\n", mem); }
 303 #endif
 304                         } else {
 305                                 int i;
 306
 307                                 switch (value) {
 308                                         case 0x800: case 0x804:
 309                                                 if (writeok == 0) break;
 310                                                 writeok = 0;
 311                                                 memset(psxMemWLUT + 0x0000, 0, 0x80 * sizeof(void *));
 312                                                 memset(psxMemWLUT + 0x8000, 0, 0x80 * sizeof(void *));
 313                                                 memset(psxMemWLUT + 0xa000, 0, 0x80 * sizeof(void *));
 314                                                 break;
 315                                         case 0x00: case 0x1e988:
 316                                                 if (writeok == 1) break;
 317                                                 writeok = 1;
 318                                                 for (i = 0; i < 0x80; i++) psxMemWLUT[i + 0x0000] = (void *)&psxM[(i & 0x1f) << 16];
 319                                                 memcpy(psxMemWLUT + 0x8000, psxMemWLUT, 0x80 * sizeof(void *));
 320                                                 memcpy(psxMemWLUT + 0xa000, psxMemWLUT, 0x80 * sizeof(void *));
 321                                                 break;
 322                                         default:
 323 #ifdef PSXMEM_LOG
 324                                                 PSXMEM_LOG("unk %8.8lx = %x\n", mem, value);
 325 #endif
 326                                                 break;
 327                                 }
 328                         }
 329                 }
 330         }
 331 }
 332
 333 void *psxMemPointer(u32 mem) {
 334         char *p;
 335         u32 t;
 336
 337         t = mem >> 16;
 338         if (t == 0x1f80) {
 339                 if (mem < 0x1f801000)
 340                         return (void *)&psxH[mem];
 341                 else
 342                         return NULL;
 343         } else {
 344                 p = (char *)(psxMemWLUT[t]);
 345                 if (p != NULL) {
 346                         return (void *)(p + (mem & 0xffff));
 347                 }
 348                 return NULL;
 349         }
 350 }