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 "debug.h"
  30 #include <sys/mman.h>
  31
  32 #ifndef MAP_ANONYMOUS
  33 #define MAP_ANONYMOUS MAP_ANON
  34 #endif
  35
  36 s8 *psxM = NULL; // Kernel & User Memory (2 Meg)
  37 s8 *psxP = NULL; // Parallel Port (64K)
  38 s8 *psxR = NULL; // BIOS ROM (512K)
  39 s8 *psxH = NULL; // Scratch Pad (1K) & Hardware Registers (8K)
  40
  41 u8 **psxMemWLUT = NULL;
  42 u8 **psxMemRLUT = NULL;
  43
  44 /*  Playstation Memory Map (from Playstation doc by Joshua Walker)
  45 0x0000_0000-0x0000_ffff         Kernel (64K)
  46 0x0001_0000-0x001f_ffff         User Memory (1.9 Meg)
  47
  48 0x1f00_0000-0x1f00_ffff         Parallel Port (64K)
  49
  50 0x1f80_0000-0x1f80_03ff         Scratch Pad (1024 bytes)
  51
  52 0x1f80_1000-0x1f80_2fff         Hardware Registers (8K)
  53
  54 0x1fc0_0000-0x1fc7_ffff         BIOS (512K)
  55
  56 0x8000_0000-0x801f_ffff         Kernel and User Memory Mirror (2 Meg) Cached
  57 0x9fc0_0000-0x9fc7_ffff         BIOS Mirror (512K) Cached
  58
  59 0xa000_0000-0xa01f_ffff         Kernel and User Memory Mirror (2 Meg) Uncached
  60 0xbfc0_0000-0xbfc7_ffff         BIOS Mirror (512K) Uncached
  61 */
  62
  63 int psxMemInit() {
  64         int i;
  65
  66         psxMemRLUT = (u8 **)malloc(0x10000 * sizeof(void *));
  67         psxMemWLUT = (u8 **)malloc(0x10000 * sizeof(void *));
  68         memset(psxMemRLUT, 0, 0x10000 * sizeof(void *));
  69         memset(psxMemWLUT, 0, 0x10000 * sizeof(void *));
  70
  71         psxM = mmap((void *)0x80000000, 0x00210000,
  72                 PROT_WRITE | PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
  73
  74         psxP = &psxM[0x200000];
  75         psxH = mmap((void *)0x1f800000, 0x00010000,
  76                 PROT_WRITE | PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
  77
  78         psxR = mmap((void *)0x1fc00000, 0x80000,
  79                 PROT_WRITE | PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
  80
  81         if (psxMemRLUT == NULL || psxMemWLUT == NULL ||
  82                 psxM != (void *)0x80000000 || psxR == MAP_FAILED ||
  83                 psxP == NULL || psxH != (void *)0x1f800000) {
  84                 SysMessage(_("Error allocating memory!"));
  85                 return -1;
  86         }
  87
  88 // MemR
  89         for (i = 0; i < 0x80; i++) psxMemRLUT[i + 0x0000] = (u8 *)&psxM[(i & 0x1f) << 16];
  90
  91         memcpy(psxMemRLUT + 0x8000, psxMemRLUT, 0x80 * sizeof(void *));
  92         memcpy(psxMemRLUT + 0xa000, psxMemRLUT, 0x80 * sizeof(void *));
  93
  94         psxMemRLUT[0x1f00] = (u8 *)psxP;
  95         psxMemRLUT[0x1f80] = (u8 *)psxH;
  96
  97         for (i = 0; i < 0x08; i++) psxMemRLUT[i + 0x1fc0] = (u8 *)&psxR[i << 16];
  98
  99         memcpy(psxMemRLUT + 0x9fc0, psxMemRLUT + 0x1fc0, 0x08 * sizeof(void *));
 100         memcpy(psxMemRLUT + 0xbfc0, psxMemRLUT + 0x1fc0, 0x08 * sizeof(void *));
 101
 102 // MemW
 103         for (i = 0; i < 0x80; i++) psxMemWLUT[i + 0x0000] = (u8 *)&psxM[(i & 0x1f) << 16];
 104
 105         memcpy(psxMemWLUT + 0x8000, psxMemWLUT, 0x80 * sizeof(void *));
 106         memcpy(psxMemWLUT + 0xa000, psxMemWLUT, 0x80 * sizeof(void *));
 107
 108         psxMemWLUT[0x1f00] = (u8 *)psxP;
 109         psxMemWLUT[0x1f80] = (u8 *)psxH;
 110
 111         return 0;
 112 }
 113
 114 void psxMemReset() {
 115         FILE *f = NULL;
 116         char bios[1024];
 117
 118         memset(psxM, 0, 0x00200000);
 119         memset(psxP, 0, 0x00010000);
 120
 121         if (strcmp(Config.Bios, "HLE") != 0) {
 122                 sprintf(bios, "%s/%s", Config.BiosDir, Config.Bios);
 123                 f = fopen(bios, "rb");
 124
 125                 if (f == NULL) {
 126                         SysMessage(_("Could not open BIOS:\"%s\". Enabling HLE Bios!\n"), bios);
 127                         memset(psxR, 0, 0x80000);
 128                         Config.HLE = TRUE;
 129                 } else {
 130                         fread(psxR, 1, 0x80000, f);
 131                         fclose(f);
 132                         Config.HLE = FALSE;
 133                 }
 134         } else Config.HLE = TRUE;
 135 }
 136
 137 void psxMemShutdown() {
 138         munmap(psxM, 0x00210000);
 139         munmap(psxH, 0x1f800000);
 140         munmap(psxR, 0x80000);
 141
 142         free(psxMemRLUT);
 143         free(psxMemWLUT);
 144 }
 145
 146 static int writeok = 1;
 147
 148 u8 psxMemRead8(u32 mem) {
 149         char *p;
 150         u32 t;
 151
 152         t = mem >> 16;
 153         if (t == 0x1f80) {
 154                 if (mem < 0x1f801000)
 155                         return psxHu8(mem);
 156                 else
 157                         return psxHwRead8(mem);
 158         } else {
 159                 p = (char *)(psxMemRLUT[t]);
 160                 if (p != NULL) {
 161                         if (Config.Debug)
 162                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, R1);
 163                         return *(u8 *)(p + (mem & 0xffff));
 164                 } else {
 165 #ifdef PSXMEM_LOG
 166                         PSXMEM_LOG("err lb %8.8lx\n", mem);
 167 #endif
 168                         return 0;
 169                 }
 170         }
 171 }
 172
 173 u16 psxMemRead16(u32 mem) {
 174         char *p;
 175         u32 t;
 176
 177         t = mem >> 16;
 178         if (t == 0x1f80) {
 179                 if (mem < 0x1f801000)
 180                         return psxHu16(mem);
 181                 else
 182                         return psxHwRead16(mem);
 183         } else {
 184                 p = (char *)(psxMemRLUT[t]);
 185                 if (p != NULL) {
 186                         if (Config.Debug)
 187                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, R2);
 188                         return SWAPu16(*(u16 *)(p + (mem & 0xffff)));
 189                 } else {
 190 #ifdef PSXMEM_LOG
 191                         PSXMEM_LOG("err lh %8.8lx\n", mem);
 192 #endif
 193                         return 0;
 194                 }
 195         }
 196 }
 197
 198 u32 psxMemRead32(u32 mem) {
 199         char *p;
 200         u32 t;
 201
 202         t = mem >> 16;
 203         if (t == 0x1f80) {
 204                 if (mem < 0x1f801000)
 205                         return psxHu32(mem);
 206                 else
 207                         return psxHwRead32(mem);
 208         } else {
 209                 p = (char *)(psxMemRLUT[t]);
 210                 if (p != NULL) {
 211                         if (Config.Debug)
 212                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, R4);
 213                         return SWAPu32(*(u32 *)(p + (mem & 0xffff)));
 214                 } else {
 215 #ifdef PSXMEM_LOG
 216                         if (writeok) { PSXMEM_LOG("err lw %8.8lx\n", mem); }
 217 #endif
 218                         return 0;
 219                 }
 220         }
 221 }
 222
 223 void psxMemWrite8(u32 mem, u8 value) {
 224         char *p;
 225         u32 t;
 226
 227         t = mem >> 16;
 228         if (t == 0x1f80) {
 229                 if (mem < 0x1f801000)
 230                         psxHu8(mem) = value;
 231                 else
 232                         psxHwWrite8(mem, value);
 233         } else {
 234                 p = (char *)(psxMemWLUT[t]);
 235                 if (p != NULL) {
 236                         if (Config.Debug)
 237                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, W1);
 238                         *(u8 *)(p + (mem & 0xffff)) = value;
 239 #ifdef PSXREC
 240                         psxCpu->Clear((mem & (~3)), 1);
 241 #endif
 242                 } else {
 243 #ifdef PSXMEM_LOG
 244                         PSXMEM_LOG("err sb %8.8lx\n", mem);
 245 #endif
 246                 }
 247         }
 248 }
 249
 250 void psxMemWrite16(u32 mem, u16 value) {
 251         char *p;
 252         u32 t;
 253
 254         t = mem >> 16;
 255         if (t == 0x1f80) {
 256                 if (mem < 0x1f801000)
 257                         psxHu16ref(mem) = SWAPu16(value);
 258                 else
 259                         psxHwWrite16(mem, value);
 260         } else {
 261                 p = (char *)(psxMemWLUT[t]);
 262                 if (p != NULL) {
 263                         if (Config.Debug)
 264                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, W2);
 265                         *(u16 *)(p + (mem & 0xffff)) = SWAPu16(value);
 266 #ifdef PSXREC
 267                         psxCpu->Clear((mem & (~3)), 1);
 268 #endif
 269                 } else {
 270 #ifdef PSXMEM_LOG
 271                         PSXMEM_LOG("err sh %8.8lx\n", mem);
 272 #endif
 273                 }
 274         }
 275 }
 276
 277 void psxMemWrite32(u32 mem, u32 value) {
 278         char *p;
 279         u32 t;
 280
 281 //      if ((mem&0x1fffff) == 0x71E18 || value == 0x48088800) SysPrintf("t2fix!!\n");
 282         t = mem >> 16;
 283         if (t == 0x1f80) {
 284                 if (mem < 0x1f801000)
 285                         psxHu32ref(mem) = SWAPu32(value);
 286                 else
 287                         psxHwWrite32(mem, value);
 288         } else {
 289                 p = (char *)(psxMemWLUT[t]);
 290                 if (p != NULL) {
 291                         if (Config.Debug)
 292                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, W4);
 293                         *(u32 *)(p + (mem & 0xffff)) = SWAPu32(value);
 294 #ifdef PSXREC
 295                         psxCpu->Clear(mem, 1);
 296 #endif
 297                 } else {
 298                         if (mem != 0xfffe0130) {
 299 #ifdef PSXREC
 300                                 if (!writeok)
 301                                         psxCpu->Clear(mem, 1);
 302 #endif
 303
 304 #ifdef PSXMEM_LOG
 305                                 if (writeok) { PSXMEM_LOG("err sw %8.8lx\n", mem); }
 306 #endif
 307                         } else {
 308                                 int i;
 309
 310                                 switch (value) {
 311                                         case 0x800: case 0x804:
 312                                                 if (writeok == 0) break;
 313                                                 writeok = 0;
 314                                                 memset(psxMemWLUT + 0x0000, 0, 0x80 * sizeof(void *));
 315                                                 memset(psxMemWLUT + 0x8000, 0, 0x80 * sizeof(void *));
 316                                                 memset(psxMemWLUT + 0xa000, 0, 0x80 * sizeof(void *));
 317                                                 break;
 318                                         case 0x00: case 0x1e988:
 319                                                 if (writeok == 1) break;
 320                                                 writeok = 1;
 321                                                 for (i = 0; i < 0x80; i++) psxMemWLUT[i + 0x0000] = (void *)&psxM[(i & 0x1f) << 16];
 322                                                 memcpy(psxMemWLUT + 0x8000, psxMemWLUT, 0x80 * sizeof(void *));
 323                                                 memcpy(psxMemWLUT + 0xa000, psxMemWLUT, 0x80 * sizeof(void *));
 324                                                 break;
 325                                         default:
 326 #ifdef PSXMEM_LOG
 327                                                 PSXMEM_LOG("unk %8.8lx = %x\n", mem, value);
 328 #endif
 329                                                 break;
 330                                 }
 331                         }
 332                 }
 333         }
 334 }
 335
 336 void *psxMemPointer(u32 mem) {
 337         char *p;
 338         u32 t;
 339
 340         t = mem >> 16;
 341         if (t == 0x1f80) {
 342                 if (mem < 0x1f801000)
 343                         return (void *)&psxH[mem];
 344                 else
 345                         return NULL;
 346         } else {
 347                 p = (char *)(psxMemWLUT[t]);
 348                 if (p != NULL) {
 349                         return (void *)(p + (mem & 0xffff));
 350                 }
 351                 return NULL;
 352         }
 353 }