src/lib/16_pm.c

   1 /* Project 16 Source Code~\r
   2  * Copyright (C) 2012-2016 sparky4 & pngwen & andrius4669 & joncampbell123 & yakui-lover\r
   3  *\r
   4  * This file is part of Project 16.\r
   5  *\r
   6  * Project 16 is free software; you can redistribute it and/or modify\r
   7  * it under the terms of the GNU General Public License as published by\r
   8  * the Free Software Foundation; either version 3 of the License, or\r
   9  * (at your option) any later version.\r
  10  *\r
  11  * Project 16 is distributed in the hope that it will be useful,\r
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
  14  * GNU General Public License for more details.\r
  15  *\r
  16  * You should have received a copy of the GNU General Public License\r
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>, or\r
  18  * write to the Free Software Foundation, Inc., 51 Franklin Street,\r
  19  * Fifth Floor, Boston, MA 02110-1301 USA.\r
  20  *\r
  21  */\r
  22 \r
  23 //\r
  24 //      ID_PM.C\r
  25 //      Id Engine's Page Manager v1.0\r
  26 //      Primary coder: Jason Blochowiak\r
  27 //\r
  28 \r
  29 #include "src/lib/16_pm.h"\r
  30 #pragma hdrstop\r
  31 \r
  32 /*\r
  33 //      Main Mem specific variables\r
  34         boolean                 MainPresent;\r
  35         memptr                  MainMemPages[PMMaxMainMem];\r
  36         PMBlockAttr             gvar->pm.mm.MainMemUsed[PMMaxMainMem];\r
  37         int                             gvar->pm.mm.MainPagesAvail;\r
  38 \r
  39 //      EMS specific variables\r
  40         boolean                 gvar->pm.emm.EMSPresent;\r
  41         word                    gvar->pm.emm.EMSAvail,gvar->pm.emm.EMSPagesAvail,gvar->pm.emm.EMSHandle,\r
  42                                         gvar->pm.emm.EMSPageFrame,gvar->pm.emm.EMSPhysicalPage;\r
  43         gvar->pm.emm.EMSListStruct      gvar->pm.emm.EMSList[EMSFrameCount];\r
  44 \r
  45 //      XMS specific variables\r
  46         boolean                 gvar->pm.xmm.XMSPresent;\r
  47         word                    gvar->pm.xmm.XMSAvail,gvar->pm.xmm.XMSPagesAvail,gvar->pm.xmm.XMSHandle;*/\r
  48         word            XMSDriver;\r
  49 /*      int                             gvar->pm.xmm.XMSProtectPage = -1;\r
  50 \r
  51 //      File specific variables\r
  52         char                    gvar->pm.fi.PageFileName[13] = {"VSWAP."};\r
  53         int                             PageFile = -1;\r
  54         word                    gvar->pm.fi.ChunksInFile;\r
  55         word                    PMSpriteStart,PMSoundStart;\r
  56 \r
  57 //      General usage variables\r
  58         boolean                 PMStarted,\r
  59                                         gvar->pm.PMPanicMode,\r
  60                                         gvar->pm.PMThrashing;\r
  61         word                    gvar->pm.XMSPagesUsed,\r
  62                                         gvar->pm.EMSPagesUsed,\r
  63                                         MainPagesUsed,\r
  64                                         gvar->pm.PMNumBlocks;\r
  65         long                    PMFrameCount;\r
  66         PageListStruct  far *gvar->pm.PMPages,\r
  67                                         _seg *gvar->pm.PMSegPages;\r
  68 */\r
  69 static  char            *ParmStrings[] = {"nomain","noems","noxms",nil};\r
  70 \r
  71 /////////////////////////////////////////////////////////////////////////////\r
  72 //\r
  73 //      EMS Management code\r
  74 //\r
  75 /////////////////////////////////////////////////////////////////////////////\r
  76 \r
  77 //\r
  78 //      PML_MapEMS() - Maps a logical page to a physical page\r
  79 //\r
  80 byte\r
  81 PML_MapEMS(word logical, byte physical, global_game_variables_t *gvar)\r
  82 {\r
  83         byte    str[160];\r
  84         unsigned        EMShandle;\r
  85         byte err;\r
  86         boolean errorflag=false;\r
  87         int     i;\r
  88         EMShandle=gvar->pm.emm.EMSHandle;\r
  89 \r
  90         __asm {\r
  91                 mov     ah,EMS_MAPPAGE\r
  92                 mov     al,physical\r
  93                 mov     bx,logical\r
  94                 mov     dx,EMShandle\r
  95                 int     EMS_INT\r
  96                 or      ah,ah\r
  97                 jnz     error\r
  98                 jmp End\r
  99 #ifdef __BORLANDC__\r
 100         }\r
 101 #endif\r
 102                 error:\r
 103 #ifdef __BORLANDC__\r
 104         __asm {\r
 105 #endif\r
 106                 mov     err,ah\r
 107                 mov     errorflag,1\r
 108 #ifdef __BORLANDC__\r
 109         }\r
 110 #endif\r
 111                 End:\r
 112 #ifdef __WATCOMC__\r
 113         }\r
 114 #endif\r
 115         if(errorflag==true)\r
 116         {\r
 117                 strcpy(str,"MM_MapEMS: EMS error ");\r
 118                 MM_EMSerr(str, err);\r
 119                 printf("%s\n",str);\r
 120                 Quit("PML_MapEMS: Page mapping failed\n");\r
 121                 return err;\r
 122         }\r
 123         return 0;\r
 124 }\r
 125 \r
 126 //\r
 127 //      PML_StartupEMS() - Sets up EMS for Page Mgr's use\r
 128 //              Checks to see if EMS driver is present\r
 129 //      Verifies that EMS hardware is present\r
 130 //              Make sure that EMS version is 3.2 or later\r
 131 //              If there's more than our minimum (2 pages) available, allocate it (up\r
 132 //                      to the maximum we need)\r
 133 //\r
 134 \r
 135         char    EMMDriverName[9] = "EMMXXXX0";\r
 136 \r
 137 boolean\r
 138 PML_StartupEMS(global_game_variables_t *gvar)\r
 139 {\r
 140         int             i;\r
 141         long    size;\r
 142         boolean errorflag;\r
 143 \r
 144         gvar->pm.emm.EMSPresent = false;                        // Assume that we'll fail\r
 145         gvar->pm.emm.EMSAvail = 0;\r
 146         errorflag=0;\r
 147 \r
 148         _DX = (word)EMMDriverName;\r
 149         _AX = 0x3d00;\r
 150         geninterrupt(0x21);                     // try to open EMMXXXX0 device\r
 151         __asm {\r
 152                 jnc     gothandle\r
 153                 mov     errorflag,1\r
 154 #ifdef __BORLANDC__\r
 155         }\r
 156 #endif\r
 157                 gothandle:\r
 158 #ifdef __WATCOMC__\r
 159         }\r
 160 #endif\r
 161         if(errorflag)\r
 162                 goto error;\r
 163 \r
 164 //gothandle:\r
 165         _BX = _AX;\r
 166         _AX = 0x4400;\r
 167         geninterrupt(0x21);                     // get device info\r
 168         __asm {\r
 169                 jnc     gotinfo\r
 170                 mov     errorflag,1\r
 171 #ifdef __BORLANDC__\r
 172         }\r
 173 #endif\r
 174                 gotinfo:\r
 175 #ifdef __WATCOMC__\r
 176         }\r
 177 #endif\r
 178         if(errorflag)\r
 179                 goto error;\r
 180 \r
 181 //gotinfo:\r
 182 __asm   and     dx,0x80\r
 183         if (!_DX)\r
 184                 goto error;\r
 185 \r
 186         _AX = 0x4407;\r
 187         geninterrupt(0x21);                     // get status\r
 188         __asm {\r
 189                 jc      error\r
 190                 jmp     end\r
 191                 error:\r
 192                 mov     errorflag,1\r
 193 #ifdef __BORLANDC__\r
 194         }\r
 195 #endif\r
 196                 end:\r
 197 #ifdef __WATCOMC__\r
 198         }\r
 199 #endif\r
 200         if (!_AL)\r
 201                 goto error;\r
 202 \r
 203         _AH = 0x3e;\r
 204         geninterrupt(0x21);                     // close handle\r
 205 \r
 206         _AH = EMS_STATUS;\r
 207         geninterrupt(EMS_INT);\r
 208         if (_AH)\r
 209                 goto error;                             // make sure EMS hardware is present\r
 210 \r
 211         _AH = EMS_VERSION;\r
 212         geninterrupt(EMS_INT);\r
 213         if (_AH || (_AL < 0x32))        // only work on EMS 3.2 or greater (silly, but...)\r
 214                 goto error;\r
 215 \r
 216         _AH = EMS_GETFRAME;\r
 217         geninterrupt(EMS_INT);\r
 218         if (_AH)\r
 219                 goto error;                             // find the page frame address\r
 220         gvar->pm.emm.EMSPageFrame = _BX;\r
 221 \r
 222         _AH = EMS_GETPAGES;\r
 223         geninterrupt(EMS_INT);\r
 224         if (_AH)\r
 225                 goto error;\r
 226         if (_BX < 2)\r
 227                 goto error;             // Require at least 2 pages (32k)\r
 228         gvar->pm.emm.EMSAvail = _BX;\r
 229 \r
 230         // Don't hog all available EMS\r
 231         size = gvar->pm.emm.EMSAvail * (long)EMSPageSize;\r
 232         if (size - (EMSPageSize * 2) > (gvar->pm.fi.ChunksInFile * (long)PMPageSize))\r
 233         {\r
 234                 size = (gvar->pm.fi.ChunksInFile * (long)PMPageSize) + EMSPageSize;\r
 235                 gvar->pm.emm.EMSAvail = size / EMSPageSize;\r
 236         }\r
 237 \r
 238         _AH = EMS_ALLOCPAGES;\r
 239         _BX = gvar->pm.emm.EMSAvail;\r
 240         geninterrupt(EMS_INT);\r
 241         if (_AH)\r
 242                 goto error;\r
 243         gvar->pm.emm.EMSHandle = _DX;\r
 244 \r
 245         gvar->mmi.EMSmem += gvar->pm.emm.EMSAvail * (long)EMSPageSize;\r
 246 \r
 247         // Initialize EMS mapping cache\r
 248         for (i = 0;i < EMSFrameCount;i++)\r
 249                 gvar->pm.emm.EMSList[i].baseEMSPage = -1;\r
 250 \r
 251         gvar->pm.emm.EMSPresent = true;                 // We have EMS\r
 252 \r
 253 error:\r
 254         return(gvar->pm.emm.EMSPresent);\r
 255 }\r
 256 \r
 257 //\r
 258 //      PML_ShutdownEMS() - If EMS was used, deallocate it\r
 259 //\r
 260 void\r
 261 PML_ShutdownEMS(global_game_variables_t *gvar)\r
 262 {\r
 263         word EMSHandle;\r
 264         EMSHandle=gvar->pm.emm.EMSHandle;\r
 265 \r
 266         if (gvar->pm.emm.EMSPresent)\r
 267         {\r
 268                 __asm {\r
 269                         mov     ah,EMS_FREEPAGES\r
 270                         mov     dx,[EMSHandle]\r
 271                         int     EMS_INT\r
 272                 }\r
 273                 if (_AH)\r
 274                 {\r
 275                         Quit("PML_ShutdownEMS: Error freeing EMS\n");\r
 276                         //return;\r
 277                 }\r
 278         }\r
 279 }\r
 280 \r
 281 /////////////////////////////////////////////////////////////////////////////\r
 282 //\r
 283 //      XMS Management code\r
 284 //\r
 285 /////////////////////////////////////////////////////////////////////////////\r
 286 \r
 287 //\r
 288 //      PML_StartupXMS() - Starts up XMS for the Page Mgr's use\r
 289 //              Checks for presence of an XMS driver\r
 290 //              Makes sure that there's at least a page of XMS available\r
 291 //              Allocates any remaining XMS (rounded down to the nearest page size)\r
 292 //\r
 293 boolean\r
 294 PML_StartupXMS(global_game_variables_t *gvar)\r
 295 {\r
 296         gvar->pm.xmm.XMSPresent = false;                                        // Assume failure\r
 297         gvar->pm.xmm.XMSAvail = 0;\r
 298 \r
 299         _AX=0x4300;\r
 300         geninterrupt(XMS_INT);                                  // Check for presence of XMS driver\r
 301         if (_AL != 0x80)\r
 302                 goto error;\r
 303 \r
 304 \r
 305         __asm {\r
 306                 mov     ax,0x4310\r
 307                 int     XMS_INT                                                 // Get address of XMS driver\r
 308                 mov     [WORD PTR XMSDriver],bx\r
 309                 mov     [WORD PTR XMSDriver+2],es               // function pointer to XMS driver\r
 310         }\r
 311 \r
 312         XMS_CALL(XMS_QUERYFREE);                        // Find out how much XMS is available\r
 313         gvar->pm.xmm.XMSAvail = _AX;\r
 314         if (!_AX)                               // AJR: bugfix 10/8/92\r
 315                 goto error;\r
 316 \r
 317         gvar->pm.xmm.XMSAvail &= ~(PMPageSizeKB - 1);   // Round off to nearest page size\r
 318         if (gvar->pm.xmm.XMSAvail < (PMPageSizeKB * 2)) // Need at least 2 pages\r
 319                 goto error;\r
 320 \r
 321         _DX = gvar->pm.xmm.XMSAvail;\r
 322         XMS_CALL(XMS_ALLOC);                            // And do the allocation\r
 323         gvar->pm.xmm.XMSHandle = _DX;\r
 324 \r
 325         if (!_AX)                               // AJR: bugfix 10/8/92\r
 326         {\r
 327                 gvar->pm.xmm.XMSAvail = 0;\r
 328                 goto error;\r
 329         }\r
 330 \r
 331         gvar->mmi.XMSmem += gvar->pm.xmm.XMSAvail * 1024;\r
 332 \r
 333         gvar->pm.xmm.XMSPresent = true;\r
 334 error:\r
 335         return(gvar->pm.xmm.XMSPresent);\r
 336 }\r
 337 \r
 338 //\r
 339 //      PML_XMSCopy() - Copies a main/EMS page to or from XMS\r
 340 //              Will round an odd-length request up to the next even value\r
 341 //\r
 342 void\r
 343 PML_XMSCopy(boolean toxms,byte far *addr,word xmspage,word length, global_game_variables_t *gvar)\r
 344 {\r
 345         dword   xoffset;\r
 346         struct\r
 347         {\r
 348                 dword   length;\r
 349                 word            source_handle;\r
 350                 dword   source_offset;\r
 351                 word            target_handle;\r
 352                 dword   target_offset;\r
 353         } copy;\r
 354 \r
 355         if (!addr)\r
 356         {\r
 357                 Quit("PML_XMSCopy: zero address\n");\r
 358                 //return;\r
 359         }\r
 360 \r
 361         xoffset = (dword)xmspage * PMPageSize;\r
 362 \r
 363         copy.length = (length + 1) & ~1;\r
 364         copy.source_handle = toxms? 0 : gvar->pm.xmm.XMSHandle;\r
 365         copy.source_offset = toxms? (long)addr : xoffset;\r
 366         copy.target_handle = toxms? gvar->pm.xmm.XMSHandle : 0;\r
 367         copy.target_offset = toxms? xoffset : (long)addr;\r
 368 \r
 369         __asm {\r
 370                 push si\r
 371         }\r
 372         _SI = (word)&copy;\r
 373         XMS_CALL(XMS_MOVE);\r
 374         __asm {\r
 375                 pop     si\r
 376         }\r
 377         if (!_AX)\r
 378         {\r
 379                 Quit("PML_XMSCopy: Error on copy");\r
 380                 //return;\r
 381         }\r
 382 }\r
 383 \r
 384 #if 1\r
 385 #define PML_CopyToXMS(s,t,l,gvar)       PML_XMSCopy(true,(s),(t),(l),(gvar))\r
 386 #define PML_CopyFromXMS(t,s,l,gvar)     PML_XMSCopy(false,(t),(s),(l),(gvar))\r
 387 #else\r
 388 //\r
 389 //      PML_CopyToXMS() - Copies the specified number of bytes from the real mode\r
 390 //              segment address to the specified XMS page\r
 391 //\r
 392 void\r
 393 PML_CopyToXMS(byte far *source,int targetpage,word length,global_game_variables_t *gvar)\r
 394 {\r
 395         PML_XMSCopy(true,source,targetpage,length, global_game_variables_t *gvar);\r
 396 }\r
 397 \r
 398 //\r
 399 //      PML_CopyFromXMS() - Copies the specified number of bytes from an XMS\r
 400 //              page to the specified real mode address\r
 401 //\r
 402 void\r
 403 PML_CopyFromXMS(byte far *target,int sourcepage,word length, global_game_variables_t *gvar)\r
 404 {\r
 405         PML_XMSCopy(false,target,sourcepage,length, global_game_variables_t *gvar);\r
 406 }\r
 407 #endif\r
 408 \r
 409 //\r
 410 //      PML_ShutdownXMS()\r
 411 //\r
 412 void\r
 413 PML_ShutdownXMS(global_game_variables_t *gvar)\r
 414 {\r
 415         if (gvar->pm.xmm.XMSPresent)\r
 416         {\r
 417                 _DX = gvar->pm.xmm.XMSHandle;\r
 418                 XMS_CALL(XMS_FREE);\r
 419                 if (_BL)\r
 420                 {\r
 421                         Quit("PML_ShutdownXMS: Error freeing XMS");\r
 422                         //return;\r
 423                 }\r
 424         }\r
 425 }\r
 426 \r
 427 /////////////////////////////////////////////////////////////////////////////\r
 428 //\r
 429 //      Main memory code\r
 430 //\r
 431 /////////////////////////////////////////////////////////////////////////////\r
 432 \r
 433 //\r
 434 //      PM_SetMainMemPurge() - Sets the purge level for all allocated main memory\r
 435 //              blocks. This shouldn't be called directly - the PM_LockMainMem() and\r
 436 //              PM_UnlockMainMem() macros should be used instead.\r
 437 //\r
 438 void\r
 439 PM_SetMainMemPurge(int level, global_game_variables_t *gvar)\r
 440 {\r
 441         int     i;\r
 442 \r
 443         for (i = 0;i < PMMaxMainMem;i++)\r
 444         {\r
 445 #ifdef __DEBUG_PM__\r
 446                 printf("PM_SetMainMemPurge()    info of gvar->pm.mm.MainMemPages[i]\n");\r
 447                 printf("        %Fp,    %Fp\n", gvar->pm.mm.MainMemPages[i],            (gvar->pm.mm.MainMemPages[i]));\r
 448                 printf("&       %Fp,    %Fp\n", &gvar->pm.mm.MainMemPages[i],   &(gvar->pm.mm.MainMemPages[i]));\r
 449 #endif\r
 450                 if (gvar->pm.mm.MainMemPages[i])\r
 451                         MM_SetPurge((gvar->pm.mm.MainMemPages[i]),level, gvar);\r
 452         }\r
 453 }\r
 454 \r
 455 //\r
 456 //      PM_CheckMainMem() - If something besides the Page Mgr makes requests of\r
 457 //              the Memory Mgr, some of the Page Mgr's blocks may have been purged,\r
 458 //              so this function runs through the block list and checks to see if\r
 459 //              any of the blocks have been purged. If so, it marks the corresponding\r
 460 //              page as purged & unlocked, then goes through the block list and\r
 461 //              tries to reallocate any blocks that have been purged.\r
 462 //      This routine now calls PM_LockMainMem() to make sure that any allocation\r
 463 //              attempts made during the block reallocation sweep don't purge any\r
 464 //              of the other blocks. Because PM_LockMainMem() is called,\r
 465 //              PM_UnlockMainMem() needs to be called before any other part of the\r
 466 //              program makes allocation requests of the Memory Mgr.\r
 467 //\r
 468 void\r
 469 PM_CheckMainMem(global_game_variables_t *gvar)\r
 470 {\r
 471         boolean                 allocfailed;\r
 472         int                             i,n;\r
 473         memptr                  *p;\r
 474         PMBlockAttr             *used;\r
 475         PageListStruct  far *page;\r
 476 \r
 477         if (!gvar->pm.mm.MainPresent)\r
 478                 return;\r
 479 \r
 480         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 481         {\r
 482                 n = page->mainPage;\r
 483                 if (n != -1)                                            // Is the page using main memory?\r
 484                 {\r
 485                         if (!gvar->pm.mm.MainMemPages[n])                       // Yep, was the block purged?\r
 486                         {\r
 487                                 page->mainPage = -1;            // Yes, mark page as purged & unlocked\r
 488                                 page->locked = pml_Unlocked;\r
 489                         }\r
 490                 }\r
 491         }\r
 492 \r
 493         // Prevent allocation attempts from purging any of our other blocks\r
 494         PM_LockMainMem(gvar);\r
 495         allocfailed = false;\r
 496         for (i = 0,p = gvar->pm.mm.MainMemPages,used = gvar->pm.mm.MainMemUsed; i < PMMaxMainMem;i++,p++,used++)\r
 497         {\r
 498                 if (!*p)                                                        // If the page got purged\r
 499                 {\r
 500                         if (*used & pmba_Allocated)             // If it was allocated\r
 501                         {\r
 502                                 *used &= ~pmba_Allocated;       // Mark as unallocated\r
 503                                 gvar->pm.mm.MainPagesAvail--;                   // and decrease available count\r
 504                         }\r
 505 \r
 506                         if (*used & pmba_Used)                  // If it was used\r
 507                         {\r
 508                                 *used &= ~pmba_Used;            // Mark as unused\r
 509                                 gvar->pm.MainPagesUsed--;                       // and decrease used count\r
 510                         }\r
 511 \r
 512                         if (!allocfailed)\r
 513                         {\r
 514                                 MM_BombOnError(false, gvar);\r
 515                                 MM_GetPtr(p,PMPageSize, gvar);          // Try to reallocate\r
 516                                 if (gvar->mm.mmerror)                                   // If it failed,\r
 517                                         allocfailed = true;                     //  don't try any more allocations\r
 518                                 else                                                    // If it worked,\r
 519                                 {\r
 520                                         *used |= pmba_Allocated;        // Mark as allocated\r
 521                                         gvar->pm.mm.MainPagesAvail++;                   // and increase available count\r
 522                                 }\r
 523                                 MM_BombOnError(true, gvar);\r
 524                         }\r
 525                 }\r
 526         }\r
 527         if (gvar->mm.mmerror)\r
 528                 gvar->mm.mmerror = false;\r
 529 }\r
 530 \r
 531 //\r
 532 //      PML_StartupMainMem() - Allocates as much main memory as is possible for\r
 533 //              the Page Mgr. The memory is allocated as non-purgeable, so if it's\r
 534 //              necessary to make requests of the Memory Mgr, PM_UnlockMainMem()\r
 535 //              needs to be called.\r
 536 //\r
 537 void\r
 538 PML_StartupMainMem(global_game_variables_t *gvar)\r
 539 {\r
 540         int             i,n;\r
 541         memptr  *p;\r
 542 \r
 543         gvar->pm.mm.MainPagesAvail = 0;\r
 544         MM_BombOnError(false, gvar);\r
 545         for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)\r
 546         {\r
 547                 MM_GetPtr(p,PMPageSize, gvar);\r
 548                 if (gvar->mm.mmerror)\r
 549                         break;\r
 550 \r
 551                 gvar->pm.mm.MainPagesAvail++;\r
 552                 gvar->pm.mm.MainMemUsed[i] = pmba_Allocated;\r
 553         }\r
 554         MM_BombOnError(true, gvar);\r
 555         if (gvar->mm.mmerror)\r
 556                 gvar->mm.mmerror = false;\r
 557         if (gvar->pm.mm.MainPagesAvail < PMMinMainMem)\r
 558         {\r
 559                 Quit("PM_SetupMainMem: Not enough main memory");\r
 560                 //return;\r
 561         }\r
 562         gvar->pm.mm.MainPresent = true;\r
 563 }\r
 564 \r
 565 //\r
 566 //      PML_ShutdownMainMem() - Frees all of the main memory blocks used by the\r
 567 //              Page Mgr.\r
 568 //\r
 569 void\r
 570 PML_ShutdownMainMem(global_game_variables_t *gvar)\r
 571 {\r
 572         int             i;\r
 573         memptr  *p;\r
 574 \r
 575         // DEBUG - mark pages as unallocated & decrease page count as appropriate\r
 576         for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)\r
 577                 if (*p)\r
 578                         MM_FreePtr(p, gvar);\r
 579 }\r
 580 \r
 581 /////////////////////////////////////////////////////////////////////////////\r
 582 //\r
 583 //      File management code\r
 584 //\r
 585 /////////////////////////////////////////////////////////////////////////////\r
 586 \r
 587 //\r
 588 //      PML_ReadFromFile() - Reads some data in from the page file\r
 589 //\r
 590 void\r
 591 PML_ReadFromFile(byte far *buf,long offset,word length, global_game_variables_t *gvar)\r
 592 {\r
 593         if (!buf)\r
 594         {\r
 595                 Quit("PML_ReadFromFile: Null pointer");\r
 596                 //return;\r
 597         }\r
 598         if (!offset)\r
 599         {\r
 600                 Quit("PML_ReadFromFile: Zero offset");\r
 601                 //return;\r
 602         }\r
 603         if (lseek(gvar->pm.fi.PageFile,offset,SEEK_SET) != offset)\r
 604         {\r
 605                 Quit("PML_ReadFromFile: Seek failed");\r
 606                 //return;\r
 607         }\r
 608         if (!CA_FarRead(gvar->pm.fi.PageFile,buf,length, gvar))\r
 609         {\r
 610                 Quit("PML_ReadFromFile: Read failed");\r
 611                 //return;\r
 612         }\r
 613 }\r
 614 \r
 615 //\r
 616 //      PML_OpenPageFile() - Opens the page file and sets up the page info\r
 617 //\r
 618 void\r
 619 PML_OpenPageFile(global_game_variables_t *gvar)\r
 620 {\r
 621         int                             i;\r
 622         long                    size;\r
 623                                 //__SEGA buf;\r
 624         memptr          buf;\r
 625         dword           far *offsetptr;\r
 626         word                    far *lengthptr;\r
 627         PageListStruct  far *page;\r
 628 \r
 629         gvar->pm.fi.PageFile = open(gvar->pm.fi.PageFileName,O_RDONLY + O_BINARY);\r
 630         if (gvar->pm.fi.PageFile == -1)\r
 631         {\r
 632                 Quit("PML_OpenPageFile: Unable to open page file");\r
 633                 //return;\r
 634         }\r
 635 \r
 636         // Read in header variables\r
 637         read(gvar->pm.fi.PageFile,&gvar->pm.fi.ChunksInFile,sizeof(gvar->pm.fi.ChunksInFile));\r
 638         read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSpriteStart,sizeof(gvar->pm.fi.PMSpriteStart));\r
 639         read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSoundStart,sizeof(gvar->pm.fi.PMSoundStart));\r
 640 \r
 641         // Allocate and clear the page list\r
 642         gvar->pm.PMNumBlocks = gvar->pm.fi.ChunksInFile;\r
 643         MM_GetPtr((memptr *)gvar->pm.PMSegPages, sizeof(PageListStruct) * (gvar->pm.PMNumBlocks), gvar);\r
 644         MM_SetLock((memptr *)gvar->pm.PMSegPages,true, gvar);\r
 645         gvar->pm.PMPages = (PageListStruct far *)gvar->pm.PMSegPages;\r
 646         _fmemset(gvar->pm.PMPages,0,sizeof(PageListStruct) * gvar->pm.PMNumBlocks);\r
 647 \r
 648         // Read in the chunk offsets\r
 649         size = sizeof(dword) * gvar->pm.fi.ChunksInFile;\r
 650         MM_GetPtr(&buf, size, gvar);\r
 651         if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))\r
 652         {\r
 653                 Quit("PML_OpenPageFile: Offset read failed");\r
 654                 //return;\r
 655         }\r
 656         offsetptr = (dword far *)buf;\r
 657         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 658                 page->offset = *offsetptr++;\r
 659         MM_FreePtr(&buf, gvar);\r
 660 \r
 661         // Read in the chunk lengths\r
 662         size = sizeof(word) * gvar->pm.fi.ChunksInFile;\r
 663         MM_GetPtr(&buf,size, gvar);\r
 664         if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))\r
 665         {\r
 666                 Quit("PML_OpenPageFile: Length read failed");\r
 667                 //return;\r
 668         }\r
 669         lengthptr = (word far *)buf;\r
 670         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 671                 page->length = *lengthptr++;\r
 672         MM_FreePtr(&buf, gvar);\r
 673 }\r
 674 \r
 675 //\r
 676 //  PML_ClosePageFile() - Closes the page file\r
 677 //\r
 678 void\r
 679 PML_ClosePageFile(global_game_variables_t *gvar)\r
 680 {\r
 681         if (gvar->pm.fi.PageFile != -1)\r
 682                 close(gvar->pm.fi.PageFile);\r
 683         if (gvar->pm.PMSegPages)\r
 684         {\r
 685                 MM_SetLock((memptr)gvar->pm.PMSegPages,false, gvar);\r
 686                 MM_FreePtr((memptr)gvar->pm.PMSegPages, gvar);\r
 687         }\r
 688 }\r
 689 \r
 690 /////////////////////////////////////////////////////////////////////////////\r
 691 //\r
 692 //      Allocation, etc., code\r
 693 //\r
 694 /////////////////////////////////////////////////////////////////////////////\r
 695 \r
 696 //\r
 697 //      PML_GetEMSAddress()\r
 698 //\r
 699 //              Page is in EMS, so figure out which EMS physical page should be used\r
 700 //              to map our page in. If normal page, use EMS physical page 3, else\r
 701 //              use the physical page specified by the lock type\r
 702 //\r
 703 #ifndef __DEBUG_2__\r
 704 #pragma argsused        // DEBUG - remove lock parameter\r
 705 memptr\r
 706 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)\r
 707 {\r
 708         int             i,emspage;\r
 709         word    emsoff,emsbase,offset;\r
 710 \r
 711         emsoff = page & (PMEMSSubPage - 1);\r
 712         emsbase = page - emsoff;\r
 713 \r
 714         emspage = -1;\r
 715         // See if this page is already mapped in\r
 716         for (i = 0;i < EMSFrameCount;i++)\r
 717         {\r
 718                 if (gvar->pm.emm.EMSList[i].baseEMSPage == emsbase)\r
 719                 {\r
 720                         emspage = i;    // Yep - don't do a redundant remapping\r
 721                         break;\r
 722                 }\r
 723         }\r
 724 \r
 725         // If page isn't already mapped in, find LRU EMS frame, and use it\r
 726         if (emspage == -1)\r
 727         {\r
 728                 dword last = LONG_MAX;\r
 729                 for (i = 0;i < EMSFrameCount;i++)\r
 730                 {\r
 731                         if (gvar->pm.emm.EMSList[i].lastHit < last)\r
 732                         {\r
 733                                 emspage = i;\r
 734                                 last = gvar->pm.emm.EMSList[i].lastHit;\r
 735                         }\r
 736                 }\r
 737 \r
 738                 gvar->pm.emm.EMSList[emspage].baseEMSPage = emsbase;\r
 739                 PML_MapEMS(page / PMEMSSubPage,emspage, gvar);\r
 740         }\r
 741 \r
 742         if (emspage == -1)\r
 743                 Quit("PML_GetEMSAddress: EMS find failed");\r
 744 \r
 745         gvar->pm.emm.EMSList[emspage].lastHit = gvar->pm.PMFrameCount;\r
 746         offset = emspage * EMSPageSizeSeg;\r
 747         offset += emsoff * PMPageSizeSeg;\r
 748         return((memptr)(gvar->pm.emm.EMSPageFrame + offset));\r
 749 }\r
 750 #else\r
 751 memptr\r
 752 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)\r
 753 {\r
 754         word    emspage;\r
 755 \r
 756         emspage = (lock < pml_EMSLock)? 3 : (lock - pml_EMSLock);\r
 757 \r
 758         PML_MapEMS(page / PMEMSSubPage,emspage);\r
 759 \r
 760         return((memptr)(EMSPageFrame + (emspage * EMSPageSizeSeg)\r
 761                         + ((page & (PMEMSSubPage - 1)) * PMPageSizeSeg)));\r
 762 }\r
 763 #endif\r
 764 \r
 765 //\r
 766 //      PM_GetPageAddress() - Returns the address of a given page\r
 767 //              Maps in EMS if necessary\r
 768 //              Returns nil if block isn't cached into Main Memory or EMS\r
 769 //\r
 770 //\r
 771 memptr\r
 772 PM_GetPageAddress(int pagenum, global_game_variables_t *gvar)\r
 773 {\r
 774         PageListStruct  far *page;\r
 775 \r
 776         page = &gvar->pm.PMPages[pagenum];\r
 777         if (page->mainPage != -1)\r
 778                 return(gvar->pm.mm.MainMemPages[page->mainPage]);\r
 779         else if (page->emsPage != -1)\r
 780                 return(PML_GetEMSAddress(page->emsPage,page->locked, gvar));\r
 781         else\r
 782                 return(nil);\r
 783 }\r
 784 \r
 785 //\r
 786 //      PML_GiveLRUPage() - Returns the page # of the least recently used\r
 787 //              present & unlocked main/EMS page (or main page if mainonly is true)\r
 788 //\r
 789 int\r
 790 PML_GiveLRUPage(boolean mainonly, global_game_variables_t *gvar)\r
 791 {\r
 792         int                             i,lru;\r
 793         long                    last;\r
 794         PageListStruct  far *page;\r
 795 \r
 796         for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 797         {\r
 798                 if\r
 799                 (\r
 800                         (page->lastHit < last)\r
 801                 &&      ((page->emsPage != -1) || (page->mainPage != -1))\r
 802                 &&      (page->locked == pml_Unlocked)\r
 803                 &&      (!(mainonly && (page->mainPage == -1)))\r
 804                 )\r
 805                 {\r
 806                         last = page->lastHit;\r
 807                         lru = i;\r
 808                 }\r
 809         }\r
 810 \r
 811         if (lru == -1)\r
 812                 Quit("PML_GiveLRUPage: LRU Search failed");\r
 813         return(lru);\r
 814 }\r
 815 \r
 816 //\r
 817 //      PML_GiveLRUXMSPage() - Returns the page # of the least recently used\r
 818 //              (and present) XMS page.\r
 819 //      This routine won't return the XMS page protected (by XMSProtectPage)\r
 820 //\r
 821 int\r
 822 PML_GiveLRUXMSPage(global_game_variables_t *gvar)\r
 823 {\r
 824         int                             i,lru;\r
 825         long                    last;\r
 826         PageListStruct  far *page;\r
 827 \r
 828         for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 829         {\r
 830                 if\r
 831                 (\r
 832                         (page->xmsPage != -1)\r
 833                 &&      (page->lastHit < last)\r
 834                 &&      (i != gvar->pm.xmm.XMSProtectPage)\r
 835                 )\r
 836                 {\r
 837                         last = page->lastHit;\r
 838                         lru = i;\r
 839                 }\r
 840         }\r
 841         return(lru);\r
 842 }\r
 843 \r
 844 //\r
 845 //      PML_PutPageInXMS() - If page isn't in XMS, find LRU XMS page and replace\r
 846 //              it with the main/EMS page\r
 847 //\r
 848 void\r
 849 PML_PutPageInXMS(int pagenum, global_game_variables_t *gvar)\r
 850 {\r
 851         int                             usexms;\r
 852         PageListStruct  far *page;\r
 853 \r
 854         if (!gvar->pm.xmm.XMSPresent)\r
 855                 return;\r
 856 \r
 857         page = &gvar->pm.PMPages[pagenum];\r
 858         if (page->xmsPage != -1)\r
 859                 return;                                 // Already in XMS\r
 860 \r
 861         if (gvar->pm.XMSPagesUsed < gvar->pm.xmm.XMSPagesAvail)\r
 862                 page->xmsPage = gvar->pm.XMSPagesUsed++;\r
 863         else\r
 864         {\r
 865                 usexms = PML_GiveLRUXMSPage(gvar);\r
 866                 if (usexms == -1)\r
 867                         Quit("PML_PutPageInXMS: No XMS LRU");\r
 868                 page->xmsPage = gvar->pm.PMPages[usexms].xmsPage;\r
 869                 gvar->pm.PMPages[usexms].xmsPage = -1;\r
 870         }\r
 871         PML_CopyToXMS(PM_GetPageAddress(pagenum, gvar),page->xmsPage,page->length, gvar);\r
 872 }\r
 873 \r
 874 //\r
 875 //      PML_TransferPageSpace() - A page is being replaced, so give the new page\r
 876 //              the old one's address space. Returns the address of the new page.\r
 877 //\r
 878 memptr\r
 879 PML_TransferPageSpace(int orig,int new, global_game_variables_t *gvar)\r
 880 {\r
 881         memptr                  addr;\r
 882         PageListStruct  far *origpage,far *newpage;\r
 883 \r
 884         if (orig == new)\r
 885                 Quit("PML_TransferPageSpace: Identity replacement");\r
 886 \r
 887         origpage = &gvar->pm.PMPages[orig];\r
 888         newpage = &gvar->pm.PMPages[new];\r
 889 \r
 890         if (origpage->locked != pml_Unlocked)\r
 891                 Quit("PML_TransferPageSpace: Killing locked page");\r
 892 \r
 893         if ((origpage->emsPage == -1) && (origpage->mainPage == -1))\r
 894                 Quit("PML_TransferPageSpace: Reusing non-existent page");\r
 895 \r
 896         // Copy page that's about to be purged into XMS\r
 897         PML_PutPageInXMS(orig, gvar);\r
 898 \r
 899         // Get the address, and force EMS into a physical page if necessary\r
 900         addr = PM_GetPageAddress(orig, gvar);\r
 901 \r
 902         // Steal the address\r
 903         newpage->emsPage = origpage->emsPage;\r
 904         newpage->mainPage = origpage->mainPage;\r
 905 \r
 906         // Mark replaced page as purged\r
 907         origpage->mainPage = origpage->emsPage = -1;\r
 908 \r
 909         if (!addr)\r
 910                 Quit("PML_TransferPageSpace: Zero replacement");\r
 911 \r
 912         return(addr);\r
 913 }\r
 914 \r
 915 //\r
 916 //      PML_GetAPageBuffer() - A page buffer is needed. Either get it from the\r
 917 //              main/EMS free pool, or use PML_GiveLRUPage() to find which page to\r
 918 //              steal the buffer from. Returns a far pointer to the page buffer, and\r
 919 //              sets the fields inside the given page structure appropriately.\r
 920 //              If mainonly is true, free EMS will be ignored, and only main pages\r
 921 //              will be looked at by PML_GiveLRUPage().\r
 922 //\r
 923 byte far *\r
 924 PML_GetAPageBuffer(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
 925 {\r
 926         byte                    far *addr = nil;\r
 927         int                             i,n;\r
 928         PMBlockAttr             *used;\r
 929         PageListStruct  far *page;\r
 930 \r
 931         page = &gvar->pm.PMPages[pagenum];\r
 932         if ((gvar->pm.EMSPagesUsed < gvar->pm.emm.EMSPagesAvail) && !mainonly)\r
 933         {\r
 934                 // There's remaining EMS - use it\r
 935                 page->emsPage = gvar->pm.EMSPagesUsed++;\r
 936                 addr = PML_GetEMSAddress(page->emsPage,page->locked, gvar);\r
 937         }\r
 938         else if (gvar->pm.MainPagesUsed < gvar->pm.mm.MainPagesAvail)\r
 939         {\r
 940                 // There's remaining main memory - use it\r
 941                 for (i = 0,n = -1,used = gvar->pm.mm.MainMemUsed;i < PMMaxMainMem;i++,used++)\r
 942                 {\r
 943                         if ((*used & pmba_Allocated) && !(*used & pmba_Used))\r
 944                         {\r
 945                                 n = i;\r
 946                                 *used |= pmba_Used;\r
 947                                 break;\r
 948                         }\r
 949                 }\r
 950                 if (n == -1)\r
 951                         Quit("PML_GetPageBuffer: MainPagesAvail lied");\r
 952                 addr = gvar->pm.mm.MainMemPages[n];\r
 953                 if (!addr)\r
 954                         Quit("PML_GetPageBuffer: Purged main block");\r
 955                 page->mainPage = n;\r
 956                 gvar->pm.MainPagesUsed++;\r
 957         }\r
 958         else\r
 959                 addr = PML_TransferPageSpace(PML_GiveLRUPage(mainonly, gvar),pagenum, gvar);\r
 960 \r
 961         if (!addr)\r
 962                 Quit("PML_GetPageBuffer: Search failed");\r
 963         return(addr);\r
 964 }\r
 965 \r
 966 //\r
 967 //      PML_GetPageFromXMS() - If page is in XMS, find LRU main/EMS page and\r
 968 //              replace it with the page from XMS. If mainonly is true, will only\r
 969 //              search for LRU main page.\r
 970 //      XMSProtectPage is set to the page to be retrieved from XMS, so that if\r
 971 //              the page from which we're stealing the main/EMS from isn't in XMS,\r
 972 //              it won't copy over the page that we're trying to get from XMS.\r
 973 //              (pages that are being purged are copied into XMS, if possible)\r
 974 //\r
 975 memptr\r
 976 PML_GetPageFromXMS(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
 977 {\r
 978         byte                    far *checkaddr;\r
 979         memptr                  addr = nil;\r
 980         PageListStruct  far *page;\r
 981 \r
 982         page = &gvar->pm.PMPages[pagenum];\r
 983         if (gvar->pm.xmm.XMSPresent && (page->xmsPage != -1))\r
 984         {\r
 985                 gvar->pm.xmm.XMSProtectPage = pagenum;\r
 986                 checkaddr = PML_GetAPageBuffer(pagenum,mainonly, gvar);\r
 987                 if (FP_OFF(checkaddr))\r
 988                         Quit("PML_GetPageFromXMS: Non segment pointer");\r
 989                 addr = (memptr)FP_SEG(checkaddr);\r
 990                 PML_CopyFromXMS(addr,page->xmsPage,page->length, gvar);\r
 991                 gvar->pm.xmm.XMSProtectPage = -1;\r
 992         }\r
 993 \r
 994         return(addr);\r
 995 }\r
 996 \r
 997 //\r
 998 //      PML_LoadPage() - A page is not in main/EMS memory, and it's not in XMS.\r
 999 //              Load it into either main or EMS. If mainonly is true, the page will\r
1000 //              only be loaded into main.\r
1001 //\r
1002 void\r
1003 PML_LoadPage(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
1004 {\r
1005         byte                    far *addr;\r
1006         PageListStruct  far *page;\r
1007 \r
1008         addr = PML_GetAPageBuffer(pagenum,mainonly, gvar);\r
1009         page = &gvar->pm.PMPages[pagenum];\r
1010         PML_ReadFromFile(addr,page->offset,page->length, gvar);\r
1011 }\r
1012 \r
1013 //\r
1014 //      PM_GetPage() - Returns the address of the page, loading it if necessary\r
1015 //              First, check if in Main Memory or EMS\r
1016 //              Then, check XMS\r
1017 //              If not in XMS, load into Main Memory or EMS\r
1018 //\r
1019 #pragma warn -pia\r
1020 memptr\r
1021 PM_GetPage(int pagenum, global_game_variables_t *gvar)\r
1022 {\r
1023         memptr  result;\r
1024 \r
1025         if (pagenum >= gvar->pm.fi.ChunksInFile)\r
1026                 Quit("PM_GetPage: Invalid page request");\r
1027 \r
1028 #ifdef __DEBUG_2__      // for debugging\r
1029         __asm {\r
1030                 mov     dx,STATUS_REGISTER_1\r
1031                 in      al,dx\r
1032                 mov     dx,ATR_INDEX\r
1033                 mov     al,ATR_OVERSCAN\r
1034                 out     dx,al\r
1035                 mov     al,10   // bright green\r
1036                 out     dx,al\r
1037         }\r
1038 #endif\r
1039 \r
1040         if (!(result = PM_GetPageAddress(pagenum, gvar)))\r
1041         {\r
1042                 boolean mainonly = (pagenum >= gvar->pm.fi.PMSoundStart);\r
1043 if (!gvar->pm.PMPages[pagenum].offset)  // JDC: sparse page\r
1044         Quit ("Tried to load a sparse page!");\r
1045                 if (!(result = PML_GetPageFromXMS(pagenum,mainonly, gvar)))\r
1046                 {\r
1047                         if (gvar->pm.PMPages[pagenum].lastHit ==  gvar->pm.PMFrameCount)\r
1048                                 gvar->pm.PMThrashing++;\r
1049 \r
1050                         PML_LoadPage(pagenum,mainonly, gvar);\r
1051                         result = PM_GetPageAddress(pagenum, gvar);\r
1052                 }\r
1053         }\r
1054         gvar->pm.PMPages[pagenum].lastHit =  gvar->pm.PMFrameCount;\r
1055 \r
1056 #ifdef __DEBUG_2__      // for debugging\r
1057         __asm{\r
1058                 mov     dx,STATUS_REGISTER_1\r
1059                 in      al,dx\r
1060                 mov     dx,ATR_INDEX\r
1061                 mov     al,ATR_OVERSCAN\r
1062                 out     dx,al\r
1063                 mov     al,3    // blue\r
1064                 out     dx,al\r
1065                 mov     al,0x20 // normal\r
1066                 out     dx,al\r
1067 #endif\r
1068 \r
1069         return(result);\r
1070 }\r
1071 #pragma warn +pia\r
1072 \r
1073 //\r
1074 //      PM_SetPageLock() - Sets the lock type on a given page\r
1075 //              pml_Unlocked: Normal, page can be purged\r
1076 //              pml_Locked: Cannot be purged\r
1077 //              pml_EMS?: Same as pml_Locked, but if in EMS, use the physical page\r
1078 //                                      specified when returning the address. For sound stuff.\r
1079 //\r
1080 void\r
1081 PM_SetPageLock(int pagenum,PMLockType lock, global_game_variables_t *gvar)\r
1082 {\r
1083         if (pagenum < gvar->pm.fi.PMSoundStart)\r
1084                 Quit("PM_SetPageLock: Locking/unlocking non-sound page");\r
1085 \r
1086         gvar->pm.PMPages[pagenum].locked = lock;\r
1087 }\r
1088 \r
1089 //\r
1090 //      PM_Preload() - Loads as many pages as possible into all types of memory.\r
1091 //              Calls the update function after each load, indicating the current\r
1092 //              page, and the total pages that need to be loaded (for thermometer).\r
1093 //\r
1094 void\r
1095 PM_Preload(boolean (*update)(word current,word total), global_game_variables_t *gvar)\r
1096 {\r
1097         int                             i,j,\r
1098                                         page,oogypage;\r
1099         word                    current,total,\r
1100                                         totalnonxms,totalxms,\r
1101                                         mainfree,maintotal,\r
1102                                         emsfree,emstotal,\r
1103                                         xmsfree,xmstotal;\r
1104         memptr                  addr;\r
1105         PageListStruct  far *p;\r
1106 \r
1107         mainfree = (gvar->pm.mm.MainPagesAvail - gvar->pm.MainPagesUsed) + (gvar->pm.emm.EMSPagesAvail - gvar->pm.EMSPagesUsed);\r
1108         xmsfree = (gvar->pm.xmm.XMSPagesAvail - gvar->pm.XMSPagesUsed);\r
1109 \r
1110         xmstotal = maintotal = 0;\r
1111 \r
1112         for (i = 0;i < gvar->pm.fi.ChunksInFile;i++)\r
1113         {\r
1114                 if (!gvar->pm.PMPages[i].offset)\r
1115                         continue;                       // sparse\r
1116 \r
1117                 if ( gvar->pm.PMPages[i].emsPage != -1 || gvar->pm.PMPages[i].mainPage != -1 )\r
1118                         continue;                       // already in main mem\r
1119 \r
1120                 if ( mainfree )\r
1121                 {\r
1122                         maintotal++;\r
1123                         mainfree--;\r
1124                 }\r
1125                 else if ( xmsfree && (gvar->pm.PMPages[i].xmsPage == -1) )\r
1126                 {\r
1127                         xmstotal++;\r
1128                         xmsfree--;\r
1129                 }\r
1130         }\r
1131 \r
1132 \r
1133         total = maintotal + xmstotal;\r
1134 \r
1135         if (!total)\r
1136                 return;\r
1137 \r
1138         page = 0;\r
1139         current = 0;\r
1140 \r
1141 //\r
1142 // cache main/ems blocks\r
1143 //\r
1144         while (maintotal)\r
1145         {\r
1146                 while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].mainPage != -1\r
1147                         ||      gvar->pm.PMPages[page].emsPage != -1 )\r
1148                         page++;\r
1149 \r
1150                 if (page >= gvar->pm.fi.ChunksInFile)\r
1151                         Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");\r
1152 \r
1153                 PM_GetPage(page, gvar);\r
1154 \r
1155                 page++;\r
1156                 current++;\r
1157                 maintotal--;\r
1158                 update(current,total);\r
1159         }\r
1160 \r
1161 //\r
1162 // load stuff to XMS\r
1163 //\r
1164         if (xmstotal)\r
1165         {\r
1166                 for (oogypage = 0 ; gvar->pm.PMPages[oogypage].mainPage == -1 ; oogypage++)\r
1167                 ;\r
1168                 addr = PM_GetPage(oogypage, gvar);\r
1169                 if (!addr)\r
1170                         Quit("PM_Preload: XMS buffer failed");\r
1171 \r
1172                 while (xmstotal)\r
1173                 {\r
1174                         while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].xmsPage != -1 )\r
1175                                 page++;\r
1176 \r
1177                         if (page >= gvar->pm.fi.ChunksInFile)\r
1178                                 Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");\r
1179 \r
1180                         p = &gvar->pm.PMPages[page];\r
1181 \r
1182                         p->xmsPage = gvar->pm.XMSPagesUsed++;\r
1183                         if (gvar->pm.XMSPagesUsed > gvar->pm.xmm.XMSPagesAvail)\r
1184                                 Quit("PM_Preload: Exceeded XMS pages");\r
1185                         if (p->length > PMPageSize)\r
1186                                 Quit("PM_Preload: Page too long");\r
1187 \r
1188                         PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);\r
1189                         PML_CopyToXMS((byte far *)addr,p->xmsPage,p->length, gvar);\r
1190 \r
1191                         page++;\r
1192                         current++;\r
1193                         xmstotal--;\r
1194                         update(current,total);\r
1195                 }\r
1196 \r
1197                 p = &gvar->pm.PMPages[oogypage];\r
1198                 PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);\r
1199         }\r
1200 \r
1201         update(total,total);\r
1202 }\r
1203 \r
1204 /////////////////////////////////////////////////////////////////////////////\r
1205 //\r
1206 //      General code\r
1207 //\r
1208 /////////////////////////////////////////////////////////////////////////////\r
1209 \r
1210 //\r
1211 //      PM_NextFrame() - Increments the frame counter and adjusts the thrash\r
1212 //              avoidence variables\r
1213 //\r
1214 //              If currently in panic mode (to avoid thrashing), check to see if the\r
1215 //                      appropriate number of frames have passed since the last time that\r
1216 //                      we would have thrashed. If so, take us out of panic mode.\r
1217 //\r
1218 //\r
1219 void\r
1220 PM_NextFrame(global_game_variables_t *gvar)\r
1221 {\r
1222         int     i;\r
1223 \r
1224         // Frame count overrun - kill the LRU hit entries & reset frame count\r
1225         if (++gvar->pm.PMFrameCount >= LONG_MAX - 4)\r
1226         {\r
1227                 for (i = 0;i < gvar->pm.PMNumBlocks;i++)\r
1228                         gvar->pm.PMPages[i].lastHit = 0;\r
1229                 gvar->pm.PMFrameCount = 0;\r
1230         }\r
1231 \r
1232 //#if 0\r
1233         for (i = 0;i < gvar->pm.fi.PMSoundStart;i++)\r
1234         {\r
1235                 if (gvar->pm.PMPages[i].locked)\r
1236                 {\r
1237                         char buf[40];\r
1238                         sprintf(buf,"PM_NextFrame: Page %d is locked",i);\r
1239                         Quit(buf);\r
1240                 }\r
1241         }\r
1242 //#endif\r
1243 \r
1244         if (gvar->pm.PMPanicMode)\r
1245         {\r
1246                 // DEBUG - set border color\r
1247                 if ((!gvar->pm.PMThrashing) && (!--gvar->pm.PMPanicMode))\r
1248                 {\r
1249                         // DEBUG - reset border color\r
1250                 }\r
1251         }\r
1252         if (gvar->pm.PMThrashing >= PMThrashThreshold)\r
1253                 gvar->pm.PMPanicMode = PMUnThrashThreshold;\r
1254         gvar->pm.PMThrashing = false;\r
1255 }\r
1256 \r
1257 //\r
1258 //      PM_Reset() - Sets up caching structures\r
1259 //\r
1260 void\r
1261 PM_Reset(global_game_variables_t *gvar)\r
1262 {\r
1263         int                             i;\r
1264         PageListStruct  far *page;\r
1265 \r
1266         gvar->pm.xmm.XMSPagesAvail = gvar->pm.xmm.XMSAvail / PMPageSizeKB;\r
1267 \r
1268         gvar->pm.emm.EMSPagesAvail = gvar->pm.emm.EMSAvail * (EMSPageSizeKB / PMPageSizeKB);\r
1269         gvar->pm.emm.EMSPhysicalPage = 0;\r
1270 \r
1271         gvar->pm.MainPagesUsed = gvar->pm.EMSPagesUsed = gvar->pm.XMSPagesUsed = 0;\r
1272 \r
1273         gvar->pm.PMPanicMode = false;\r
1274 \r
1275         gvar->pm.fi.PageFile = -1;\r
1276         gvar->pm.xmm.XMSProtectPage = -1;\r
1277 \r
1278         // Initialize page list\r
1279         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.PMNumBlocks;i++,page++)\r
1280         {\r
1281                 page->mainPage = -1;\r
1282                 page->emsPage = -1;\r
1283                 page->xmsPage = -1;\r
1284                 page->locked = false;\r
1285         }\r
1286 }\r
1287 \r
1288 //\r
1289 //      PM_Startup() - Start up the Page Mgr\r
1290 //\r
1291 void\r
1292 PM_Startup(global_game_variables_t *gvar)\r
1293 {\r
1294         boolean nomain,noems,noxms;\r
1295         int             i;\r
1296 \r
1297         if (gvar->pm.PMStarted)\r
1298                 return;\r
1299 \r
1300         strcat(&(gvar->pm.fi.PageFileName), "VSWAP.");\r
1301 \r
1302         nomain = noems = noxms = false;\r
1303         for (i = 1;i <\r
1304 #ifdef __WATCOMC__\r
1305         __argc\r
1306 #endif\r
1307 #ifdef __BORLANDC__\r
1308         _argc\r
1309 #endif\r
1310         ;i++)\r
1311         {\r
1312                 switch (US_CheckParm(\r
1313 #ifdef __WATCOMC__\r
1314         __argv[i]\r
1315 #endif\r
1316 #ifdef __BORLANDC__\r
1317         _argv[i]\r
1318 #endif\r
1319                 ,ParmStrings))\r
1320                 {\r
1321                 case 0:\r
1322                         nomain = true;\r
1323                         break;\r
1324                 case 1:\r
1325                         noems = true;\r
1326                         break;\r
1327                 case 2:\r
1328                         noxms = true;\r
1329                         break;\r
1330                 }\r
1331         }\r
1332 \r
1333         PML_OpenPageFile(gvar);\r
1334 \r
1335         if (!noems)\r
1336                 PML_StartupEMS(gvar);\r
1337         if (!noxms)\r
1338                 PML_StartupXMS(gvar);\r
1339 \r
1340         if (nomain && !gvar->pm.emm.EMSPresent)\r
1341         {\r
1342                 Quit("PM_Startup: No main or EMS\n");\r
1343                 //return;\r
1344         }\r
1345         else\r
1346                 PML_StartupMainMem(gvar);\r
1347 \r
1348         PM_Reset(gvar);\r
1349 \r
1350         gvar->pm.PMStarted = true;\r
1351 }\r
1352 \r
1353 //\r
1354 //      PM_Shutdown() - Shut down the Page Mgr\r
1355 //\r
1356 void\r
1357 PM_Shutdown(global_game_variables_t *gvar)\r
1358 {\r
1359         PML_ShutdownXMS(gvar);\r
1360         PML_ShutdownEMS(gvar);\r
1361 \r
1362         if (!gvar->pm.PMStarted)\r
1363                 return;\r
1364 \r
1365         PML_ClosePageFile(gvar);\r
1366 \r
1367         PML_ShutdownMainMem(gvar);\r
1368 }\r