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 "psxmem_map.h"
  28 #include "r3000a.h"
  29 #include "psxhw.h"
  30 #include "debug.h"
  31
  32 #include "memmap.h"
  33
  34 #ifdef USE_LIBRETRO_VFS
  35 #include <streams/file_stream_transforms.h>
  36 #endif
  37
  38 #ifndef MAP_ANONYMOUS
  39 #define MAP_ANONYMOUS MAP_ANON
  40 #endif
  41
  42 boolean writeok = TRUE;
  43
  44 #ifndef NDEBUG
  45 #include "debug.h"
  46 #else
  47 void DebugCheckBP(u32 address, enum breakpoint_types type) {}
  48 #endif
  49
  50 void *(*psxMapHook)(unsigned long addr, size_t size, int is_fixed,
  51                 enum psxMapTag tag);
  52 void (*psxUnmapHook)(void *ptr, size_t size, enum psxMapTag tag);
  53
  54 void *psxMap(unsigned long addr, size_t size, int is_fixed,
  55                 enum psxMapTag tag)
  56 {
  57 #ifdef LIGHTREC
  58 #ifdef MAP_FIXED_NOREPLACE
  59         int flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED_NOREPLACE;
  60 #else
  61         int flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED;
  62 #endif
  63 #else
  64         int flags = MAP_PRIVATE | MAP_ANONYMOUS;
  65 #endif
  66
  67         int try_ = 0;
  68         unsigned long mask;
  69         void *req, *ret;
  70
  71 retry:
  72         if (psxMapHook != NULL) {
  73                 ret = psxMapHook(addr, size, 0, tag);
  74                 if (ret == NULL)
  75                         return NULL;
  76         }
  77         else {
  78                 /* avoid MAP_FIXED, it overrides existing mappings.. */
  79                 /* if (is_fixed)
  80                         flags |= MAP_FIXED; */
  81
  82                 req = (void *)addr;
  83                 ret = mmap(req, size, PROT_READ | PROT_WRITE, flags, -1, 0);
  84                 if (ret == MAP_FAILED)
  85                         return NULL;
  86         }
  87
  88         if (addr != 0 && ret != (void *)addr) {
  89                 SysMessage("psxMap: warning: wanted to map @%08x, got %p\n",
  90                         addr, ret);
  91
  92                 if (is_fixed) {
  93                         psxUnmap(ret, size, tag);
  94                         return NULL;
  95                 }
  96
  97                 if (((addr ^ (unsigned long)ret) & ~0xff000000l) && try_ < 2)
  98                 {
  99                         psxUnmap(ret, size, tag);
 100
 101                         // try to use similarly aligned memory instead
 102                         // (recompiler needs this)
 103                         mask = try_ ? 0xffff : 0xffffff;
 104                         addr = ((unsigned long)ret + mask) & ~mask;
 105                         try_++;
 106                         goto retry;
 107                 }
 108         }
 109
 110         return ret;
 111 }
 112
 113 void psxUnmap(void *ptr, size_t size, enum psxMapTag tag)
 114 {
 115         if (psxUnmapHook != NULL) {
 116                 psxUnmapHook(ptr, size, tag);
 117                 return;
 118         }
 119
 120         if (ptr)
 121                 munmap(ptr, size);
 122 }
 123
 124 s8 *psxM = NULL; // Kernel & User Memory (2 Meg)
 125 s8 *psxP = NULL; // Parallel Port (64K)
 126 s8 *psxR = NULL; // BIOS ROM (512K)
 127 s8 *psxH = NULL; // Scratch Pad (1K) & Hardware Registers (8K)
 128
 129 u8 **psxMemWLUT = NULL;
 130 u8 **psxMemRLUT = NULL;
 131
 132 /*  Playstation Memory Map (from Playstation doc by Joshua Walker)
 133 0x0000_0000-0x0000_ffff         Kernel (64K)
 134 0x0001_0000-0x001f_ffff         User Memory (1.9 Meg)
 135
 136 0x1f00_0000-0x1f00_ffff         Parallel Port (64K)
 137
 138 0x1f80_0000-0x1f80_03ff         Scratch Pad (1024 bytes)
 139
 140 0x1f80_1000-0x1f80_2fff         Hardware Registers (8K)
 141
 142 0x1fc0_0000-0x1fc7_ffff         BIOS (512K)
 143
 144 0x8000_0000-0x801f_ffff         Kernel and User Memory Mirror (2 Meg) Cached
 145 0x9fc0_0000-0x9fc7_ffff         BIOS Mirror (512K) Cached
 146
 147 0xa000_0000-0xa01f_ffff         Kernel and User Memory Mirror (2 Meg) Uncached
 148 0xbfc0_0000-0xbfc7_ffff         BIOS Mirror (512K) Uncached
 149 */
 150
 151 int psxMemInit() {
 152         int i;
 153
 154         psxMemRLUT = (u8 **)malloc(0x10000 * sizeof(void *));
 155         psxMemWLUT = (u8 **)malloc(0x10000 * sizeof(void *));
 156         memset(psxMemRLUT, 0, 0x10000 * sizeof(void *));
 157         memset(psxMemWLUT, 0, 0x10000 * sizeof(void *));
 158
 159 #ifdef LIGHTREC
 160         psxM = psxMap(0x30000000, 0x00210000, 1, MAP_TAG_RAM);
 161         if (psxM == NULL)
 162                 psxM = psxMap(0x70000000, 0x00210000, 1, MAP_TAG_RAM);
 163
 164 #else
 165         psxM = psxMap(0x80000000, 0x00210000, 1, MAP_TAG_RAM);
 166 #endif
 167 #ifndef RAM_FIXED
 168         if (psxM == NULL)
 169                 psxM = psxMap(0x77000000, 0x00210000, 0, MAP_TAG_RAM);
 170 #endif
 171         if (psxM == NULL) {
 172                 SysMessage(_("mapping main RAM failed"));
 173                 return -1;
 174         }
 175
 176         psxP = &psxM[0x200000];
 177 #ifdef LIGHTREC
 178         psxH = psxMap(0x4f800000, 0x10000, 0, MAP_TAG_OTHER);
 179         if (psxH == NULL)
 180                 psxH = psxMap(0x8f800000, 0x10000, 0, MAP_TAG_OTHER);
 181
 182         psxR = psxMap(0x4fc00000, 0x80000, 0, MAP_TAG_OTHER);
 183         if (psxR == NULL)
 184                 psxR = psxMap(0x8fc00000, 0x80000, 0, MAP_TAG_OTHER);
 185 #else
 186         psxH = psxMap(0x1f800000, 0x10000, 0, MAP_TAG_OTHER);
 187         psxR = psxMap(0x1fc00000, 0x80000, 0, MAP_TAG_OTHER);
 188 #endif
 189
 190         if (psxMemRLUT == NULL || psxMemWLUT == NULL ||
 191             psxR == NULL || psxP == NULL || psxH == NULL) {
 192                 SysMessage(_("Error allocating memory!"));
 193                 psxMemShutdown();
 194                 return -1;
 195         }
 196
 197 // MemR
 198         for (i = 0; i < 0x80; i++) psxMemRLUT[i + 0x0000] = (u8 *)&psxM[(i & 0x1f) << 16];
 199
 200         memcpy(psxMemRLUT + 0x8000, psxMemRLUT, 0x80 * sizeof(void *));
 201         memcpy(psxMemRLUT + 0xa000, psxMemRLUT, 0x80 * sizeof(void *));
 202
 203         psxMemRLUT[0x1f00] = (u8 *)psxP;
 204         psxMemRLUT[0x1f80] = (u8 *)psxH;
 205
 206         for (i = 0; i < 0x08; i++) psxMemRLUT[i + 0x1fc0] = (u8 *)&psxR[i << 16];
 207
 208         memcpy(psxMemRLUT + 0x9fc0, psxMemRLUT + 0x1fc0, 0x08 * sizeof(void *));
 209         memcpy(psxMemRLUT + 0xbfc0, psxMemRLUT + 0x1fc0, 0x08 * sizeof(void *));
 210
 211 // MemW
 212         for (i = 0; i < 0x80; i++) psxMemWLUT[i + 0x0000] = (u8 *)&psxM[(i & 0x1f) << 16];
 213
 214         memcpy(psxMemWLUT + 0x8000, psxMemWLUT, 0x80 * sizeof(void *));
 215         memcpy(psxMemWLUT + 0xa000, psxMemWLUT, 0x80 * sizeof(void *));
 216
 217         psxMemWLUT[0x1f00] = (u8 *)psxP;
 218         psxMemWLUT[0x1f80] = (u8 *)psxH;
 219
 220         return 0;
 221 }
 222
 223 void psxMemReset() {
 224         FILE *f = NULL;
 225         char bios[1024];
 226
 227         memset(psxM, 0, 0x00200000);
 228         memset(psxP, 0xff, 0x00010000);
 229
 230         Config.HLE = TRUE;
 231
 232         if (strcmp(Config.Bios, "HLE") != 0) {
 233                 sprintf(bios, "%s/%s", Config.BiosDir, Config.Bios);
 234                 f = fopen(bios, "rb");
 235
 236                 if (f == NULL) {
 237                         SysMessage(_("Could not open BIOS:\"%s\". Enabling HLE Bios!\n"), bios);
 238                         memset(psxR, 0, 0x80000);
 239                 } else {
 240                         if (fread(psxR, 1, 0x80000, f) == 0x80000) {
 241                                 Config.HLE = FALSE;
 242                         } else {
 243                                 SysMessage(_("The selected BIOS:\"%s\" is of wrong size. Enabling HLE Bios!\n"), bios);
 244                         }
 245                         fclose(f);
 246                 }
 247         }
 248 }
 249
 250 void psxMemShutdown() {
 251         psxUnmap(psxM, 0x00210000, MAP_TAG_RAM); psxM = NULL;
 252         psxUnmap(psxH, 0x10000, MAP_TAG_OTHER); psxH = NULL;
 253         psxUnmap(psxR, 0x80000, MAP_TAG_OTHER); psxR = NULL;
 254
 255         free(psxMemRLUT); psxMemRLUT = NULL;
 256         free(psxMemWLUT); psxMemWLUT = NULL;
 257 }
 258
 259 u8 psxMemRead8(u32 mem) {
 260         char *p;
 261         u32 t;
 262
 263         t = mem >> 16;
 264         if (t == 0x1f80 || t == 0x9f80 || t == 0xbf80) {
 265                 if ((mem & 0xffff) < 0x400)
 266                         return psxHu8(mem);
 267                 else
 268                         return psxHwRead8(mem);
 269         } else {
 270                 p = (char *)(psxMemRLUT[t]);
 271                 if (p != NULL) {
 272                         if (Config.Debug)
 273                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, R1);
 274                         return *(u8 *)(p + (mem & 0xffff));
 275                 } else {
 276 #ifdef PSXMEM_LOG
 277                         PSXMEM_LOG("err lb %8.8lx\n", mem);
 278 #endif
 279                         return 0;
 280                 }
 281         }
 282 }
 283
 284 u16 psxMemRead16(u32 mem) {
 285         char *p;
 286         u32 t;
 287
 288         t = mem >> 16;
 289         if (t == 0x1f80 || t == 0x9f80 || t == 0xbf80) {
 290                 if ((mem & 0xffff) < 0x400)
 291                         return psxHu16(mem);
 292                 else
 293                         return psxHwRead16(mem);
 294         } else {
 295                 p = (char *)(psxMemRLUT[t]);
 296                 if (p != NULL) {
 297                         if (Config.Debug)
 298                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, R2);
 299                         return SWAPu16(*(u16 *)(p + (mem & 0xffff)));
 300                 } else {
 301 #ifdef PSXMEM_LOG
 302                         PSXMEM_LOG("err lh %8.8lx\n", mem);
 303 #endif
 304                         return 0;
 305                 }
 306         }
 307 }
 308
 309 u32 psxMemRead32(u32 mem) {
 310         char *p;
 311         u32 t;
 312
 313         t = mem >> 16;
 314         if (t == 0x1f80 || t == 0x9f80 || t == 0xbf80) {
 315                 if ((mem & 0xffff) < 0x400)
 316                         return psxHu32(mem);
 317                 else
 318                         return psxHwRead32(mem);
 319         } else {
 320                 p = (char *)(psxMemRLUT[t]);
 321                 if (p != NULL) {
 322                         if (Config.Debug)
 323                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, R4);
 324                         return SWAPu32(*(u32 *)(p + (mem & 0xffff)));
 325                 } else {
 326 #ifdef PSXMEM_LOG
 327                         if (writeok) { PSXMEM_LOG("err lw %8.8lx\n", mem); }
 328 #endif
 329                         return 0;
 330                 }
 331         }
 332 }
 333
 334 void psxMemWrite8(u32 mem, u8 value) {
 335         char *p;
 336         u32 t;
 337
 338         t = mem >> 16;
 339         if (t == 0x1f80 || t == 0x9f80 || t == 0xbf80) {
 340                 if ((mem & 0xffff) < 0x400)
 341                         psxHu8(mem) = value;
 342                 else
 343                         psxHwWrite8(mem, value);
 344         } else {
 345                 p = (char *)(psxMemWLUT[t]);
 346                 if (p != NULL) {
 347                         if (Config.Debug)
 348                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, W1);
 349                         *(u8 *)(p + (mem & 0xffff)) = value;
 350 #ifdef PSXREC
 351                         psxCpu->Clear((mem & (~3)), 1);
 352 #endif
 353                 } else {
 354 #ifdef PSXMEM_LOG
 355                         PSXMEM_LOG("err sb %8.8lx\n", mem);
 356 #endif
 357                 }
 358         }
 359 }
 360
 361 void psxMemWrite16(u32 mem, u16 value) {
 362         char *p;
 363         u32 t;
 364
 365         t = mem >> 16;
 366         if (t == 0x1f80 || t == 0x9f80 || t == 0xbf80) {
 367                 if ((mem & 0xffff) < 0x400)
 368                         psxHu16ref(mem) = SWAPu16(value);
 369                 else
 370                         psxHwWrite16(mem, value);
 371         } else {
 372                 p = (char *)(psxMemWLUT[t]);
 373                 if (p != NULL) {
 374                         if (Config.Debug)
 375                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, W2);
 376                         *(u16 *)(p + (mem & 0xffff)) = SWAPu16(value);
 377 #ifdef PSXREC
 378                         psxCpu->Clear((mem & (~3)), 1);
 379 #endif
 380                 } else {
 381 #ifdef PSXMEM_LOG
 382                         PSXMEM_LOG("err sh %8.8lx\n", mem);
 383 #endif
 384                 }
 385         }
 386 }
 387
 388 void psxMemWrite32(u32 mem, u32 value) {
 389         char *p;
 390 #if defined(ICACHE_EMULATION)
 391         /*  Stores in PS1 code during cache isolation invalidate cachelines.
 392          * It is assumed that cache-flush routines write to the lowest 4KB of
 393          * address space for Icache, or 1KB for Dcache/scratchpad.
 394          *  Originally, stores had to check 'writeok' in psxRegs struct before
 395          * writing to RAM. To eliminate this necessity, we could simply patch the
 396          * BIOS 0x44 FlushCache() A0 jumptable entry. Unfortunately, this won't
 397          * work for some games that use less-buggy non-BIOS cache-flush routines
 398          * like '007 Tomorrow Never Dies', often provided by SN-systems, the PS1
 399          * toolchain provider.
 400          *  Instead, we backup the lowest 64KB PS1 RAM when the cache is isolated.
 401          * All stores write to RAM regardless of cache state. Thus, cache-flush
 402          * routines temporarily trash the lowest 4KB of PS1 RAM. Fortunately, they
 403          * ran in a 'critical section' with interrupts disabled, so there's little
 404          * worry of PS1 code ever reading the trashed contents.
 405          *  We point the relevant portions of psxMemRLUT[] to the 64KB backup while
 406          * cache is isolated. This is in case the dynarec needs to recompile some
 407          * code during isolation. As long as it reads code using psxMemRLUT[] ptrs,
 408          * it should never see trashed RAM contents.
 409          *
 410          * -senquack, mips dynarec team, 2017
 411          */
 412         static u32 mem_bak[0x10000/4];
 413 #endif
 414         u32 t;
 415         u32 m = mem & 0xffff;
 416 //      if ((mem&0x1fffff) == 0x71E18 || value == 0x48088800) SysPrintf("t2fix!!\n");
 417         t = mem >> 16;
 418         if (t == 0x1f80 || t == 0x9f80 || t == 0xbf80) {
 419                 if (m < 0x400)
 420                         psxHu32ref(mem) = SWAPu32(value);
 421                 else
 422                         psxHwWrite32(mem, value);
 423         } else {
 424                 p = (char *)(psxMemWLUT[t]);
 425                 if (p != NULL) {
 426                         if (Config.Debug)
 427                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, W4);
 428                         *(u32 *)(p + (mem & 0xffff)) = SWAPu32(value);
 429 #ifdef PSXREC
 430                         psxCpu->Clear(mem, 1);
 431 #endif
 432                 } else {
 433                         if (mem != 0xfffe0130) {
 434 #ifdef PSXREC
 435                                 if (!writeok)
 436                                         psxCpu->Clear(mem, 1);
 437 #endif
 438
 439 #ifdef PSXMEM_LOG
 440                                 if (writeok) { PSXMEM_LOG("err sw %8.8lx\n", mem); }
 441 #endif
 442                         } else {
 443                                 int i;
 444
 445                                 switch (value) {
 446                                         case 0x800: case 0x804:
 447                                                 if (writeok == FALSE) break;
 448                                                 writeok = FALSE;
 449                                                 memset(psxMemWLUT + 0x0000, 0, 0x80 * sizeof(void *));
 450                                                 memset(psxMemWLUT + 0x8000, 0, 0x80 * sizeof(void *));
 451                                                 memset(psxMemWLUT + 0xa000, 0, 0x80 * sizeof(void *));
 452 #ifdef ICACHE_EMULATION
 453                                                 /* Cache is now isolated, pending cache-flush sequence:
 454                                                 *  Backup lower 64KB of PS1 RAM, adjust psxMemRLUT[].
 455                                                 */
 456                                                 memcpy((void*)mem_bak, (void*)psxM, sizeof(mem_bak));
 457                                                 psxMemRLUT[0x0000] = psxMemRLUT[0x0020] = psxMemRLUT[0x0040] = psxMemRLUT[0x0060] = (u8 *)mem_bak;
 458                                                 psxMemRLUT[0x8000] = psxMemRLUT[0x8020] = psxMemRLUT[0x8040] = psxMemRLUT[0x8060] = (u8 *)mem_bak;
 459                                                 psxMemRLUT[0xa000] = psxMemRLUT[0xa020] = psxMemRLUT[0xa040] = psxMemRLUT[0xa060] = (u8 *)mem_bak;
 460                                                 psxCpu->Notify(R3000ACPU_NOTIFY_CACHE_ISOLATED, NULL);
 461 #endif
 462                                                 break;
 463                                         case 0x00: case 0x1e988:
 464                                                 if (writeok == TRUE) break;
 465                                                 writeok = TRUE;
 466                                                 for (i = 0; i < 0x80; i++) psxMemWLUT[i + 0x0000] = (void *)&psxM[(i & 0x1f) << 16];
 467                                                 memcpy(psxMemWLUT + 0x8000, psxMemWLUT, 0x80 * sizeof(void *));
 468                                                 memcpy(psxMemWLUT + 0xa000, psxMemWLUT, 0x80 * sizeof(void *));
 469 #ifdef ICACHE_EMULATION
 470                                                 /* Cache is now unisolated:
 471                                                 * Restore lower 64KB RAM contents and psxMemRLUT[].
 472                                                 */
 473                                                 memcpy((void*)psxM, (void*)mem_bak, sizeof(mem_bak));
 474                                                 psxMemRLUT[0x0000] = psxMemRLUT[0x0020] = psxMemRLUT[0x0040] = psxMemRLUT[0x0060] = (u8 *)psxM;
 475                                                 psxMemRLUT[0x8000] = psxMemRLUT[0x8020] = psxMemRLUT[0x8040] = psxMemRLUT[0x8060] = (u8 *)psxM;
 476                                                 psxMemRLUT[0xa000] = psxMemRLUT[0xa020] = psxMemRLUT[0xa040] = psxMemRLUT[0xa060] = (u8 *)psxM;
 477                                                 /* Dynarecs might take this opportunity to flush their code cache */
 478                                                 psxCpu->Notify(R3000ACPU_NOTIFY_CACHE_UNISOLATED, NULL);
 479 #endif
 480                                                 break;
 481                                         default:
 482 #ifdef PSXMEM_LOG
 483                                                 PSXMEM_LOG("unk %8.8lx = %x\n", mem, value);
 484 #endif
 485                                                 break;
 486                                 }
 487                         }
 488                 }
 489         }
 490 }
 491
 492 void *psxMemPointer(u32 mem) {
 493         char *p;
 494         u32 t;
 495
 496         t = mem >> 16;
 497         if (t == 0x1f80 || t == 0x9f80 || t == 0xbf80) {
 498                 if ((mem & 0xffff) < 0x400)
 499                         return (void *)&psxH[mem];
 500                 else
 501                         return NULL;
 502         } else {
 503                 p = (char *)(psxMemWLUT[t]);
 504                 if (p != NULL) {
 505                         return (void *)(p + (mem & 0xffff));
 506                 }
 507                 return NULL;
 508         }
 509 }