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         // Don't allow writes to PIO Expansion region (psxP) to take effect.
 218         // NOTE: Not sure if this is needed to fix any games but seems wise,
 219         //       seeing as some games do read from PIO as part of copy-protection
 220         //       check. (See fix in psxMemReset() regarding psxP region reads).
 221         psxMemWLUT[0x1f00] = NULL;
 222         psxMemWLUT[0x1f80] = (u8 *)psxH;
 223
 224         return 0;
 225 }
 226
 227 void psxMemReset() {
 228         FILE *f = NULL;
 229         char bios[1024];
 230
 231         memset(psxM, 0, 0x00200000);
 232         memset(psxP, 0xff, 0x00010000);
 233
 234         Config.HLE = TRUE;
 235
 236         if (strcmp(Config.Bios, "HLE") != 0) {
 237                 sprintf(bios, "%s/%s", Config.BiosDir, Config.Bios);
 238                 f = fopen(bios, "rb");
 239
 240                 if (f == NULL) {
 241                         SysMessage(_("Could not open BIOS:\"%s\". Enabling HLE Bios!\n"), bios);
 242                         memset(psxR, 0, 0x80000);
 243                 } else {
 244                         if (fread(psxR, 1, 0x80000, f) == 0x80000) {
 245                                 Config.HLE = FALSE;
 246                         } else {
 247                                 SysMessage(_("The selected BIOS:\"%s\" is of wrong size. Enabling HLE Bios!\n"), bios);
 248                         }
 249                         fclose(f);
 250                 }
 251         }
 252 }
 253
 254 void psxMemShutdown() {
 255         psxUnmap(psxM, 0x00210000, MAP_TAG_RAM); psxM = NULL;
 256         psxUnmap(psxH, 0x10000, MAP_TAG_OTHER); psxH = NULL;
 257         psxUnmap(psxR, 0x80000, MAP_TAG_OTHER); psxR = NULL;
 258
 259         free(psxMemRLUT); psxMemRLUT = NULL;
 260         free(psxMemWLUT); psxMemWLUT = NULL;
 261 }
 262
 263 u8 psxMemRead8(u32 mem) {
 264         char *p;
 265         u32 t;
 266
 267         t = mem >> 16;
 268         if (t == 0x1f80 || t == 0x9f80 || t == 0xbf80) {
 269                 if ((mem & 0xffff) < 0x400)
 270                         return psxHu8(mem);
 271                 else
 272                         return psxHwRead8(mem);
 273         } else {
 274                 p = (char *)(psxMemRLUT[t]);
 275                 if (p != NULL) {
 276                         if (Config.Debug)
 277                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, R1);
 278                         return *(u8 *)(p + (mem & 0xffff));
 279                 } else {
 280 #ifdef PSXMEM_LOG
 281                         PSXMEM_LOG("err lb %8.8lx\n", mem);
 282 #endif
 283                         return 0xFF;
 284                 }
 285         }
 286 }
 287
 288 u16 psxMemRead16(u32 mem) {
 289         char *p;
 290         u32 t;
 291
 292         t = mem >> 16;
 293         if (t == 0x1f80 || t == 0x9f80 || t == 0xbf80) {
 294                 if ((mem & 0xffff) < 0x400)
 295                         return psxHu16(mem);
 296                 else
 297                         return psxHwRead16(mem);
 298         } else {
 299                 p = (char *)(psxMemRLUT[t]);
 300                 if (p != NULL) {
 301                         if (Config.Debug)
 302                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, R2);
 303                         return SWAPu16(*(u16 *)(p + (mem & 0xffff)));
 304                 } else {
 305 #ifdef PSXMEM_LOG
 306                         PSXMEM_LOG("err lh %8.8lx\n", mem);
 307 #endif
 308                         return 0xFFFF;
 309                 }
 310         }
 311 }
 312
 313 u32 psxMemRead32(u32 mem) {
 314         char *p;
 315         u32 t;
 316
 317         t = mem >> 16;
 318         if (t == 0x1f80 || t == 0x9f80 || t == 0xbf80) {
 319                 if ((mem & 0xffff) < 0x400)
 320                         return psxHu32(mem);
 321                 else
 322                         return psxHwRead32(mem);
 323         } else {
 324                 p = (char *)(psxMemRLUT[t]);
 325                 if (p != NULL) {
 326                         if (Config.Debug)
 327                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, R4);
 328                         return SWAPu32(*(u32 *)(p + (mem & 0xffff)));
 329                 } else {
 330 #ifdef PSXMEM_LOG
 331                         if (writeok) { PSXMEM_LOG("err lw %8.8lx\n", mem); }
 332 #endif
 333                         return 0xFFFFFFFF;
 334                 }
 335         }
 336 }
 337
 338 void psxMemWrite8(u32 mem, u8 value) {
 339         char *p;
 340         u32 t;
 341
 342         t = mem >> 16;
 343         if (t == 0x1f80 || t == 0x9f80 || t == 0xbf80) {
 344                 if ((mem & 0xffff) < 0x400)
 345                         psxHu8(mem) = value;
 346                 else
 347                         psxHwWrite8(mem, value);
 348         } else {
 349                 p = (char *)(psxMemWLUT[t]);
 350                 if (p != NULL) {
 351                         if (Config.Debug)
 352                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, W1);
 353                         *(u8 *)(p + (mem & 0xffff)) = value;
 354 #ifdef PSXREC
 355                         psxCpu->Clear((mem & (~3)), 1);
 356 #endif
 357                 } else {
 358 #ifdef PSXMEM_LOG
 359                         PSXMEM_LOG("err sb %8.8lx\n", mem);
 360 #endif
 361                 }
 362         }
 363 }
 364
 365 void psxMemWrite16(u32 mem, u16 value) {
 366         char *p;
 367         u32 t;
 368
 369         t = mem >> 16;
 370         if (t == 0x1f80 || t == 0x9f80 || t == 0xbf80) {
 371                 if ((mem & 0xffff) < 0x400)
 372                         psxHu16ref(mem) = SWAPu16(value);
 373                 else
 374                         psxHwWrite16(mem, value);
 375         } else {
 376                 p = (char *)(psxMemWLUT[t]);
 377                 if (p != NULL) {
 378                         if (Config.Debug)
 379                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, W2);
 380                         *(u16 *)(p + (mem & 0xffff)) = SWAPu16(value);
 381 #ifdef PSXREC
 382                         psxCpu->Clear((mem & (~3)), 1);
 383 #endif
 384                 } else {
 385 #ifdef PSXMEM_LOG
 386                         PSXMEM_LOG("err sh %8.8lx\n", mem);
 387 #endif
 388                 }
 389         }
 390 }
 391
 392 void psxMemWrite32(u32 mem, u32 value) {
 393         char *p;
 394 #if defined(ICACHE_EMULATION)
 395         /*  Stores in PS1 code during cache isolation invalidate cachelines.
 396          * It is assumed that cache-flush routines write to the lowest 4KB of
 397          * address space for Icache, or 1KB for Dcache/scratchpad.
 398          *  Originally, stores had to check 'writeok' in psxRegs struct before
 399          * writing to RAM. To eliminate this necessity, we could simply patch the
 400          * BIOS 0x44 FlushCache() A0 jumptable entry. Unfortunately, this won't
 401          * work for some games that use less-buggy non-BIOS cache-flush routines
 402          * like '007 Tomorrow Never Dies', often provided by SN-systems, the PS1
 403          * toolchain provider.
 404          *  Instead, we backup the lowest 64KB PS1 RAM when the cache is isolated.
 405          * All stores write to RAM regardless of cache state. Thus, cache-flush
 406          * routines temporarily trash the lowest 4KB of PS1 RAM. Fortunately, they
 407          * ran in a 'critical section' with interrupts disabled, so there's little
 408          * worry of PS1 code ever reading the trashed contents.
 409          *  We point the relevant portions of psxMemRLUT[] to the 64KB backup while
 410          * cache is isolated. This is in case the dynarec needs to recompile some
 411          * code during isolation. As long as it reads code using psxMemRLUT[] ptrs,
 412          * it should never see trashed RAM contents.
 413          *
 414          * -senquack, mips dynarec team, 2017
 415          */
 416         static u32 mem_bak[0x10000/4];
 417 #endif
 418         u32 t;
 419         u32 m = mem & 0xffff;
 420 //      if ((mem&0x1fffff) == 0x71E18 || value == 0x48088800) SysPrintf("t2fix!!\n");
 421         t = mem >> 16;
 422         if (t == 0x1f80 || t == 0x9f80 || t == 0xbf80) {
 423                 if (m < 0x400)
 424                         psxHu32ref(mem) = SWAPu32(value);
 425                 else
 426                         psxHwWrite32(mem, value);
 427         } else {
 428                 p = (char *)(psxMemWLUT[t]);
 429                 if (p != NULL) {
 430                         if (Config.Debug)
 431                                 DebugCheckBP((mem & 0xffffff) | 0x80000000, W4);
 432                         *(u32 *)(p + (mem & 0xffff)) = SWAPu32(value);
 433 #ifdef PSXREC
 434                         psxCpu->Clear(mem, 1);
 435 #endif
 436                 } else {
 437                         if (mem != 0xfffe0130) {
 438 #ifdef PSXREC
 439                                 if (!writeok)
 440                                         psxCpu->Clear(mem, 1);
 441 #endif
 442
 443 #ifdef PSXMEM_LOG
 444                                 if (writeok) { PSXMEM_LOG("err sw %8.8lx\n", mem); }
 445 #endif
 446                         } else {
 447                                 int i;
 448
 449                                 switch (value) {
 450                                         case 0x800: case 0x804:
 451                                                 if (writeok == FALSE) break;
 452                                                 writeok = FALSE;
 453                                                 memset(psxMemWLUT + 0x0000, 0, 0x80 * sizeof(void *));
 454                                                 memset(psxMemWLUT + 0x8000, 0, 0x80 * sizeof(void *));
 455                                                 memset(psxMemWLUT + 0xa000, 0, 0x80 * sizeof(void *));
 456 #ifdef ICACHE_EMULATION
 457                                                 /* Cache is now isolated, pending cache-flush sequence:
 458                                                 *  Backup lower 64KB of PS1 RAM, adjust psxMemRLUT[].
 459                                                 */
 460                                                 memcpy((void*)mem_bak, (void*)psxM, sizeof(mem_bak));
 461                                                 psxMemRLUT[0x0000] = psxMemRLUT[0x0020] = psxMemRLUT[0x0040] = psxMemRLUT[0x0060] = (u8 *)mem_bak;
 462                                                 psxMemRLUT[0x8000] = psxMemRLUT[0x8020] = psxMemRLUT[0x8040] = psxMemRLUT[0x8060] = (u8 *)mem_bak;
 463                                                 psxMemRLUT[0xa000] = psxMemRLUT[0xa020] = psxMemRLUT[0xa040] = psxMemRLUT[0xa060] = (u8 *)mem_bak;
 464                                                 psxCpu->Notify(R3000ACPU_NOTIFY_CACHE_ISOLATED, NULL);
 465 #endif
 466                                                 break;
 467                                         case 0x00: case 0x1e988:
 468                                                 if (writeok == TRUE) break;
 469                                                 writeok = TRUE;
 470                                                 for (i = 0; i < 0x80; i++) psxMemWLUT[i + 0x0000] = (void *)&psxM[(i & 0x1f) << 16];
 471                                                 memcpy(psxMemWLUT + 0x8000, psxMemWLUT, 0x80 * sizeof(void *));
 472                                                 memcpy(psxMemWLUT + 0xa000, psxMemWLUT, 0x80 * sizeof(void *));
 473 #ifdef ICACHE_EMULATION
 474                                                 /* Cache is now unisolated:
 475                                                 * Restore lower 64KB RAM contents and psxMemRLUT[].
 476                                                 */
 477                                                 memcpy((void*)psxM, (void*)mem_bak, sizeof(mem_bak));
 478                                                 psxMemRLUT[0x0000] = psxMemRLUT[0x0020] = psxMemRLUT[0x0040] = psxMemRLUT[0x0060] = (u8 *)psxM;
 479                                                 psxMemRLUT[0x8000] = psxMemRLUT[0x8020] = psxMemRLUT[0x8040] = psxMemRLUT[0x8060] = (u8 *)psxM;
 480                                                 psxMemRLUT[0xa000] = psxMemRLUT[0xa020] = psxMemRLUT[0xa040] = psxMemRLUT[0xa060] = (u8 *)psxM;
 481                                                 /* Dynarecs might take this opportunity to flush their code cache */
 482                                                 psxCpu->Notify(R3000ACPU_NOTIFY_CACHE_UNISOLATED, NULL);
 483 #endif
 484                                                 break;
 485                                         default:
 486 #ifdef PSXMEM_LOG
 487                                                 PSXMEM_LOG("unk %8.8lx = %x\n", mem, value);
 488 #endif
 489                                                 break;
 490                                 }
 491                         }
 492                 }
 493         }
 494 }
 495
 496 void *psxMemPointer(u32 mem) {
 497         char *p;
 498         u32 t;
 499
 500         t = mem >> 16;
 501         if (t == 0x1f80 || t == 0x9f80 || t == 0xbf80) {
 502                 if ((mem & 0xffff) < 0x400)
 503                         return (void *)&psxH[mem];
 504                 else
 505                         return NULL;
 506         } else {
 507                 p = (char *)(psxMemWLUT[t]);
 508                 if (p != NULL) {
 509                         return (void *)(p + (mem & 0xffff));
 510                 }
 511                 return NULL;
 512         }
 513 }