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 = (s8 *)malloc(0x00080000);
  77
  78         if (psxMemRLUT == NULL || psxMemWLUT == NULL ||
  79                 psxM != (void *)0x80000000 || psxP == NULL || psxH == NULL) {
  80                 SysMessage(_("Error allocating memory!"));
  81                 return -1;
  82         }
  83
  84 // MemR
  85         for (i = 0; i < 0x80; i++) psxMemRLUT[i + 0x0000] = (u8 *)&psxM[(i & 0x1f) << 16];
  86
  87         memcpy(psxMemRLUT + 0x8000, psxMemRLUT, 0x80 * sizeof(void *));
  88         memcpy(psxMemRLUT + 0xa000, psxMemRLUT, 0x80 * sizeof(void *));
  89
  90         psxMemRLUT[0x1f00] = (u8 *)psxP;
  91         psxMemRLUT[0x1f80] = (u8 *)psxH;
  92
  93         for (i = 0; i < 0x08; i++) psxMemRLUT[i + 0x1fc0] = (u8 *)&psxR[i << 16];
  94
  95         memcpy(psxMemRLUT + 0x9fc0, psxMemRLUT + 0x1fc0, 0x08 * sizeof(void *));
  96         memcpy(psxMemRLUT + 0xbfc0, psxMemRLUT + 0x1fc0, 0x08 * sizeof(void *));
  97
  98 // MemW
  99         for (i = 0; i < 0x80; i++) psxMemWLUT[i + 0x0000] = (u8 *)&psxM[(i & 0x1f) << 16];
 100
 101         memcpy(psxMemWLUT + 0x8000, psxMemWLUT, 0x80 * sizeof(void *));
 102         memcpy(psxMemWLUT + 0xa000, psxMemWLUT, 0x80 * sizeof(void *));
 103
 104         psxMemWLUT[0x1f00] = (u8 *)psxP;
 105         psxMemWLUT[0x1f80] = (u8 *)psxH;
 106
 107         return 0;
 108 }
 109
 110 void psxMemReset() {
 111         FILE *f = NULL;
 112         char bios[1024];
 113
 114         memset(psxM, 0, 0x00200000);
 115         memset(psxP, 0, 0x00010000);
 116
 117         if (strcmp(Config.Bios, "HLE") != 0) {
 118                 sprintf(bios, "%s/%s", Config.BiosDir, Config.Bios);
 119                 f = fopen(bios, "rb");
 120
 121                 if (f == NULL) {
 122                         SysMessage(_("Could not open BIOS:\"%s\". Enabling HLE Bios!\n"), bios);
 123                         memset(psxR, 0, 0x80000);
 124                         Config.HLE = TRUE;
 125                 } else {
 126                         fread(psxR, 1, 0x80000, f);
 127                         fclose(f);
 128                         Config.HLE = FALSE;
 129                 }
 130         } else Config.HLE = TRUE;
 131 }
 132
 133 void psxMemShutdown() {
 134         munmap(psxM, 0x00220000);
 135
 136         free(psxR);
 137         free(psxMemRLUT);
 138         free(psxMemWLUT);
 139 }
 140
 141 static int writeok = 1;
 142
 143 u8 psxMemRead8(u32 mem) {
 144         char *p;
 145         u32 t;
 146
 147         t = mem >> 16;
 148         if (t == 0x1f80) {
 149                 if (mem < 0x1f801000)
 150                         return psxHu8(mem);
 151                 else
 152                         return psxHwRead8(mem);
 153         } else {
 154                 p = (char *)(psxMemRLUT[t]);
 155                 if (p != NULL) {
 156                         if (Config.Debug)
 157                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, R1);
 158                         return *(u8 *)(p + (mem & 0xffff));
 159                 } else {
 160 #ifdef PSXMEM_LOG
 161                         PSXMEM_LOG("err lb %8.8lx\n", mem);
 162 #endif
 163                         return 0;
 164                 }
 165         }
 166 }
 167
 168 u16 psxMemRead16(u32 mem) {
 169         char *p;
 170         u32 t;
 171
 172         t = mem >> 16;
 173         if (t == 0x1f80) {
 174                 if (mem < 0x1f801000)
 175                         return psxHu16(mem);
 176                 else
 177                         return psxHwRead16(mem);
 178         } else {
 179                 p = (char *)(psxMemRLUT[t]);
 180                 if (p != NULL) {
 181                         if (Config.Debug)
 182                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, R2);
 183                         return SWAPu16(*(u16 *)(p + (mem & 0xffff)));
 184                 } else {
 185 #ifdef PSXMEM_LOG
 186                         PSXMEM_LOG("err lh %8.8lx\n", mem);
 187 #endif
 188                         return 0;
 189                 }
 190         }
 191 }
 192
 193 u32 psxMemRead32(u32 mem) {
 194         char *p;
 195         u32 t;
 196
 197         t = mem >> 16;
 198         if (t == 0x1f80) {
 199                 if (mem < 0x1f801000)
 200                         return psxHu32(mem);
 201                 else
 202                         return psxHwRead32(mem);
 203         } else {
 204                 p = (char *)(psxMemRLUT[t]);
 205                 if (p != NULL) {
 206                         if (Config.Debug)
 207                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, R4);
 208                         return SWAPu32(*(u32 *)(p + (mem & 0xffff)));
 209                 } else {
 210 #ifdef PSXMEM_LOG
 211                         if (writeok) { PSXMEM_LOG("err lw %8.8lx\n", mem); }
 212 #endif
 213                         return 0;
 214                 }
 215         }
 216 }
 217
 218 void psxMemWrite8(u32 mem, u8 value) {
 219         char *p;
 220         u32 t;
 221
 222         t = mem >> 16;
 223         if (t == 0x1f80) {
 224                 if (mem < 0x1f801000)
 225                         psxHu8(mem) = value;
 226                 else
 227                         psxHwWrite8(mem, value);
 228         } else {
 229                 p = (char *)(psxMemWLUT[t]);
 230                 if (p != NULL) {
 231                         if (Config.Debug)
 232                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, W1);
 233                         *(u8 *)(p + (mem & 0xffff)) = value;
 234 #ifdef PSXREC
 235                         psxCpu->Clear((mem & (~3)), 1);
 236 #endif
 237                 } else {
 238 #ifdef PSXMEM_LOG
 239                         PSXMEM_LOG("err sb %8.8lx\n", mem);
 240 #endif
 241                 }
 242         }
 243 }
 244
 245 void psxMemWrite16(u32 mem, u16 value) {
 246         char *p;
 247         u32 t;
 248
 249         t = mem >> 16;
 250         if (t == 0x1f80) {
 251                 if (mem < 0x1f801000)
 252                         psxHu16ref(mem) = SWAPu16(value);
 253                 else
 254                         psxHwWrite16(mem, value);
 255         } else {
 256                 p = (char *)(psxMemWLUT[t]);
 257                 if (p != NULL) {
 258                         if (Config.Debug)
 259                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, W2);
 260                         *(u16 *)(p + (mem & 0xffff)) = SWAPu16(value);
 261 #ifdef PSXREC
 262                         psxCpu->Clear((mem & (~1)), 1);
 263 #endif
 264                 } else {
 265 #ifdef PSXMEM_LOG
 266                         PSXMEM_LOG("err sh %8.8lx\n", mem);
 267 #endif
 268                 }
 269         }
 270 }
 271
 272 void psxMemWrite32(u32 mem, u32 value) {
 273         char *p;
 274         u32 t;
 275
 276 //      if ((mem&0x1fffff) == 0x71E18 || value == 0x48088800) SysPrintf("t2fix!!\n");
 277         t = mem >> 16;
 278         if (t == 0x1f80) {
 279                 if (mem < 0x1f801000)
 280                         psxHu32ref(mem) = SWAPu32(value);
 281                 else
 282                         psxHwWrite32(mem, value);
 283         } else {
 284                 p = (char *)(psxMemWLUT[t]);
 285                 if (p != NULL) {
 286                         if (Config.Debug)
 287                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, W4);
 288                         *(u32 *)(p + (mem & 0xffff)) = SWAPu32(value);
 289 #ifdef PSXREC
 290                         psxCpu->Clear(mem, 1);
 291 #endif
 292                 } else {
 293                         if (mem != 0xfffe0130) {
 294 #ifdef PSXREC
 295                                 if (!writeok)
 296                                         psxCpu->Clear(mem, 1);
 297 #endif
 298
 299 #ifdef PSXMEM_LOG
 300                                 if (writeok) { PSXMEM_LOG("err sw %8.8lx\n", mem); }
 301 #endif
 302                         } else {
 303                                 int i;
 304
 305                                 switch (value) {
 306                                         case 0x800: case 0x804:
 307                                                 if (writeok == 0) break;
 308                                                 writeok = 0;
 309                                                 memset(psxMemWLUT + 0x0000, 0, 0x80 * sizeof(void *));
 310                                                 memset(psxMemWLUT + 0x8000, 0, 0x80 * sizeof(void *));
 311                                                 memset(psxMemWLUT + 0xa000, 0, 0x80 * sizeof(void *));
 312                                                 break;
 313                                         case 0x00: case 0x1e988:
 314                                                 if (writeok == 1) break;
 315                                                 writeok = 1;
 316                                                 for (i = 0; i < 0x80; i++) psxMemWLUT[i + 0x0000] = (void *)&psxM[(i & 0x1f) << 16];
 317                                                 memcpy(psxMemWLUT + 0x8000, psxMemWLUT, 0x80 * sizeof(void *));
 318                                                 memcpy(psxMemWLUT + 0xa000, psxMemWLUT, 0x80 * sizeof(void *));
 319                                                 break;
 320                                         default:
 321 #ifdef PSXMEM_LOG
 322                                                 PSXMEM_LOG("unk %8.8lx = %x\n", mem, value);
 323 #endif
 324                                                 break;
 325                                 }
 326                         }
 327                 }
 328         }
 329 }
 330
 331 void *psxMemPointer(u32 mem) {
 332         char *p;
 333         u32 t;
 334
 335         t = mem >> 16;
 336         if (t == 0x1f80) {
 337                 if (mem < 0x1f801000)
 338                         return (void *)&psxH[mem];
 339                 else
 340                         return NULL;
 341         } else {
 342                 p = (char *)(psxMemWLUT[t]);
 343                 if (p != NULL) {
 344                         return (void *)(p + (mem & 0xffff));
 345                 }
 346                 return NULL;
 347         }
 348 }