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         //XMSD;\r
 297         gvar->pm.xmm.XMSPresent = false;                                        // Assume failure\r
 298         gvar->pm.xmm.XMSAvail = 0;\r
 299 \r
 300         _AX=0x4300;\r
 301         geninterrupt(XMS_INT);                                  // Check for presence of XMS driver\r
 302         if (_AL != 0x80)\r
 303                 goto error;\r
 304 \r
 305 \r
 306         __asm {\r
 307                 mov     ax,0x4310\r
 308                 int     XMS_INT                                                 // Get address of XMS driver\r
 309                 mov     [WORD PTR XMSDriver],bx\r
 310                 mov     [WORD PTR XMSDriver+2],es               // function pointer to XMS driver\r
 311         }\r
 312 \r
 313         XMS_CALL(XMS_QUERYFREE);                        // Find out how much XMS is available\r
 314         gvar->pm.xmm.XMSAvail = _AX;\r
 315         if (!_AX)                               // AJR: bugfix 10/8/92\r
 316                 goto error;\r
 317 \r
 318         gvar->pm.xmm.XMSAvail &= ~(PMPageSizeKB - 1);   // Round off to nearest page size\r
 319         if (gvar->pm.xmm.XMSAvail < (PMPageSizeKB * 2)) // Need at least 2 pages\r
 320                 goto error;\r
 321 \r
 322         _DX = gvar->pm.xmm.XMSAvail;\r
 323         XMS_CALL(XMS_ALLOC);                            // And do the allocation\r
 324         gvar->pm.xmm.XMSHandle = _DX;\r
 325 \r
 326         if (!_AX)                               // AJR: bugfix 10/8/92\r
 327         {\r
 328                 gvar->pm.xmm.XMSAvail = 0;\r
 329                 goto error;\r
 330         }\r
 331 \r
 332         gvar->mmi.XMSmem += gvar->pm.xmm.XMSAvail * 1024;\r
 333 \r
 334         gvar->pm.xmm.XMSPresent = true;\r
 335 error:\r
 336         return(gvar->pm.xmm.XMSPresent);\r
 337 }\r
 338 \r
 339 //\r
 340 //      PML_XMSCopy() - Copies a main/EMS page to or from XMS\r
 341 //              Will round an odd-length request up to the next even value\r
 342 //\r
 343 void\r
 344 PML_XMSCopy(boolean toxms,byte far *addr,word xmspage,word length, global_game_variables_t *gvar)\r
 345 {\r
 346 #ifdef __WATCOMC__\r
 347         //XMSD;\r
 348 #endif\r
 349         dword   xoffset;\r
 350         struct\r
 351         {\r
 352                 dword   length;\r
 353                 word            source_handle;\r
 354                 dword   source_offset;\r
 355                 word            target_handle;\r
 356                 dword   target_offset;\r
 357         } copy;\r
 358 \r
 359         if (!addr)\r
 360         {\r
 361                 Quit("PML_XMSCopy: zero address\n");\r
 362                 //return;\r
 363         }\r
 364 \r
 365         xoffset = (dword)xmspage * PMPageSize;\r
 366 \r
 367         copy.length = (length + 1) & ~1;\r
 368         copy.source_handle = toxms? 0 : gvar->pm.xmm.XMSHandle;\r
 369         copy.source_offset = toxms? (long)addr : xoffset;\r
 370         copy.target_handle = toxms? gvar->pm.xmm.XMSHandle : 0;\r
 371         copy.target_offset = toxms? xoffset : (long)addr;\r
 372 \r
 373         __asm {\r
 374                 push si\r
 375         }\r
 376         _SI = (word)&copy;\r
 377         XMS_CALL(XMS_MOVE);\r
 378         __asm {\r
 379                 pop     si\r
 380         }\r
 381         if (!_AX)\r
 382         {\r
 383                 Quit("PML_XMSCopy: Error on copy");\r
 384                 //return;\r
 385         }\r
 386 }\r
 387 \r
 388 #if 1\r
 389 #define PML_CopyToXMS(s,t,l,gvar)       PML_XMSCopy(true,(s),(t),(l),(gvar))\r
 390 #define PML_CopyFromXMS(t,s,l,gvar)     PML_XMSCopy(false,(t),(s),(l),(gvar))\r
 391 #else\r
 392 //\r
 393 //      PML_CopyToXMS() - Copies the specified number of bytes from the real mode\r
 394 //              segment address to the specified XMS page\r
 395 //\r
 396 void\r
 397 PML_CopyToXMS(byte far *source,int targetpage,word length,global_game_variables_t *gvar)\r
 398 {\r
 399         PML_XMSCopy(true,source,targetpage,length, global_game_variables_t *gvar);\r
 400 }\r
 401 \r
 402 //\r
 403 //      PML_CopyFromXMS() - Copies the specified number of bytes from an XMS\r
 404 //              page to the specified real mode address\r
 405 //\r
 406 void\r
 407 PML_CopyFromXMS(byte far *target,int sourcepage,word length, global_game_variables_t *gvar)\r
 408 {\r
 409         PML_XMSCopy(false,target,sourcepage,length, global_game_variables_t *gvar);\r
 410 }\r
 411 #endif\r
 412 \r
 413 //\r
 414 //      PML_ShutdownXMS()\r
 415 //\r
 416 void\r
 417 PML_ShutdownXMS(global_game_variables_t *gvar)\r
 418 {\r
 419         //XMSD;\r
 420         if (gvar->pm.xmm.XMSPresent)\r
 421         {\r
 422                 _DX = gvar->pm.xmm.XMSHandle;\r
 423                 XMS_CALL(XMS_FREE);\r
 424                 if (_BL)\r
 425                 {\r
 426                         Quit("PML_ShutdownXMS: Error freeing XMS");\r
 427                         //return;\r
 428                 }\r
 429         }\r
 430 }\r
 431 \r
 432 /////////////////////////////////////////////////////////////////////////////\r
 433 //\r
 434 //      Main memory code\r
 435 //\r
 436 /////////////////////////////////////////////////////////////////////////////\r
 437 \r
 438 //\r
 439 //      PM_SetMainMemPurge() - Sets the purge level for all allocated main memory\r
 440 //              blocks. This shouldn't be called directly - the PM_LockMainMem() and\r
 441 //              PM_UnlockMainMem() macros should be used instead.\r
 442 //\r
 443 void\r
 444 PM_SetMainMemPurge(int level, global_game_variables_t *gvar)\r
 445 {\r
 446         int     i;\r
 447 \r
 448         for (i = 0;i < PMMaxMainMem;i++)\r
 449         {\r
 450 #ifdef __DEBUG_PM__\r
 451                 printf("PM_SetMainMemPurge()    info of gvar->pm.mm.MainMemPages[i]\n");\r
 452                 printf("        %Fp,    %Fp\n", gvar->pm.mm.MainMemPages[i],            (gvar->pm.mm.MainMemPages[i]));\r
 453                 printf("&       %Fp,    %Fp\n", &gvar->pm.mm.MainMemPages[i],   &(gvar->pm.mm.MainMemPages[i]));\r
 454 #endif\r
 455                 if (gvar->pm.mm.MainMemPages[i])\r
 456                         MM_SetPurge((gvar->pm.mm.MainMemPages[i]),level, gvar);\r
 457         }\r
 458 }\r
 459 \r
 460 //\r
 461 //      PM_CheckMainMem() - If something besides the Page Mgr makes requests of\r
 462 //              the Memory Mgr, some of the Page Mgr's blocks may have been purged,\r
 463 //              so this function runs through the block list and checks to see if\r
 464 //              any of the blocks have been purged. If so, it marks the corresponding\r
 465 //              page as purged & unlocked, then goes through the block list and\r
 466 //              tries to reallocate any blocks that have been purged.\r
 467 //      This routine now calls PM_LockMainMem() to make sure that any allocation\r
 468 //              attempts made during the block reallocation sweep don't purge any\r
 469 //              of the other blocks. Because PM_LockMainMem() is called,\r
 470 //              PM_UnlockMainMem() needs to be called before any other part of the\r
 471 //              program makes allocation requests of the Memory Mgr.\r
 472 //\r
 473 void\r
 474 PM_CheckMainMem(global_game_variables_t *gvar)\r
 475 {\r
 476         boolean                 allocfailed;\r
 477         int                             i,n;\r
 478         memptr                  *p;\r
 479         PMBlockAttr             *used;\r
 480         PageListStruct  far *page;\r
 481 \r
 482         if (!gvar->pm.mm.MainPresent)\r
 483                 return;\r
 484 \r
 485         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 486         {\r
 487                 n = page->mainPage;\r
 488                 if (n != -1)                                            // Is the page using main memory?\r
 489                 {\r
 490                         if (!gvar->pm.mm.MainMemPages[n])                       // Yep, was the block purged?\r
 491                         {\r
 492                                 page->mainPage = -1;            // Yes, mark page as purged & unlocked\r
 493                                 page->locked = pml_Unlocked;\r
 494                         }\r
 495                 }\r
 496         }\r
 497 \r
 498         // Prevent allocation attempts from purging any of our other blocks\r
 499         PM_LockMainMem(gvar);\r
 500         allocfailed = false;\r
 501         for (i = 0,p = gvar->pm.mm.MainMemPages,used = gvar->pm.mm.MainMemUsed; i < PMMaxMainMem;i++,p++,used++)\r
 502         {\r
 503                 if (!*p)                                                        // If the page got purged\r
 504                 {\r
 505                         if (*used & pmba_Allocated)             // If it was allocated\r
 506                         {\r
 507                                 *used &= ~pmba_Allocated;       // Mark as unallocated\r
 508                                 gvar->pm.mm.MainPagesAvail--;                   // and decrease available count\r
 509                         }\r
 510 \r
 511                         if (*used & pmba_Used)                  // If it was used\r
 512                         {\r
 513                                 *used &= ~pmba_Used;            // Mark as unused\r
 514                                 gvar->pm.MainPagesUsed--;                       // and decrease used count\r
 515                         }\r
 516 \r
 517                         if (!allocfailed)\r
 518                         {\r
 519                                 MM_BombOnError(false, gvar);\r
 520                                 MM_GetPtr(p,PMPageSize, gvar);          // Try to reallocate\r
 521                                 if (gvar->mm.mmerror)                                   // If it failed,\r
 522                                         allocfailed = true;                     //  don't try any more allocations\r
 523                                 else                                                    // If it worked,\r
 524                                 {\r
 525                                         *used |= pmba_Allocated;        // Mark as allocated\r
 526                                         gvar->pm.mm.MainPagesAvail++;                   // and increase available count\r
 527                                 }\r
 528                                 MM_BombOnError(true, gvar);\r
 529                         }\r
 530                 }\r
 531         }\r
 532         if (gvar->mm.mmerror)\r
 533                 gvar->mm.mmerror = false;\r
 534 }\r
 535 \r
 536 //\r
 537 //      PML_StartupMainMem() - Allocates as much main memory as is possible for\r
 538 //              the Page Mgr. The memory is allocated as non-purgeable, so if it's\r
 539 //              necessary to make requests of the Memory Mgr, PM_UnlockMainMem()\r
 540 //              needs to be called.\r
 541 //\r
 542 void\r
 543 PML_StartupMainMem(global_game_variables_t *gvar)\r
 544 {\r
 545         int             i,n;\r
 546         memptr  *p;\r
 547 \r
 548         gvar->pm.mm.MainPagesAvail = 0;\r
 549         MM_BombOnError(false, gvar);\r
 550         for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)\r
 551         {\r
 552                 MM_GetPtr(p,PMPageSize, gvar);\r
 553                 if (gvar->mm.mmerror)\r
 554                         break;\r
 555 \r
 556                 gvar->pm.mm.MainPagesAvail++;\r
 557                 gvar->pm.mm.MainMemUsed[i] = pmba_Allocated;\r
 558         }\r
 559         MM_BombOnError(true, gvar);\r
 560         if (gvar->mm.mmerror)\r
 561                 gvar->mm.mmerror = false;\r
 562         if (gvar->pm.mm.MainPagesAvail < PMMinMainMem)\r
 563         {\r
 564                 Quit("PM_SetupMainMem: Not enough main memory");\r
 565                 //return;\r
 566         }\r
 567         gvar->pm.mm.MainPresent = true;\r
 568 }\r
 569 \r
 570 //\r
 571 //      PML_ShutdownMainMem() - Frees all of the main memory blocks used by the\r
 572 //              Page Mgr.\r
 573 //\r
 574 void\r
 575 PML_ShutdownMainMem(global_game_variables_t *gvar)\r
 576 {\r
 577         int             i;\r
 578         memptr  *p;\r
 579 \r
 580         // DEBUG - mark pages as unallocated & decrease page count as appropriate\r
 581         for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)\r
 582                 if (*p)\r
 583                         MM_FreePtr(p, gvar);\r
 584 }\r
 585 \r
 586 /////////////////////////////////////////////////////////////////////////////\r
 587 //\r
 588 //      File management code\r
 589 //\r
 590 /////////////////////////////////////////////////////////////////////////////\r
 591 \r
 592 //\r
 593 //      PML_ReadFromFile() - Reads some data in from the page file\r
 594 //\r
 595 void\r
 596 PML_ReadFromFile(byte far *buf,long offset,word length, global_game_variables_t *gvar)\r
 597 {\r
 598         if (!buf)\r
 599         {\r
 600                 Quit("PML_ReadFromFile: Null pointer");\r
 601                 //return;\r
 602         }\r
 603         if (!offset)\r
 604         {\r
 605                 Quit("PML_ReadFromFile: Zero offset");\r
 606                 //return;\r
 607         }\r
 608         if (lseek(gvar->pm.fi.PageFile,offset,SEEK_SET) != offset)\r
 609         {\r
 610                 Quit("PML_ReadFromFile: Seek failed");\r
 611                 //return;\r
 612         }\r
 613         if (!CA_FarRead(gvar->pm.fi.PageFile,buf,length, gvar))\r
 614         {\r
 615                 Quit("PML_ReadFromFile: Read failed");\r
 616                 //return;\r
 617         }\r
 618 }\r
 619 \r
 620 //\r
 621 //      PML_OpenPageFile() - Opens the page file and sets up the page info\r
 622 //\r
 623 void\r
 624 PML_OpenPageFile(global_game_variables_t *gvar)\r
 625 {\r
 626         int                             i;\r
 627         long                    size;\r
 628                                 //__SEGA buf;\r
 629         memptr          buf;\r
 630         dword           far *offsetptr;\r
 631         word                    far *lengthptr;\r
 632         PageListStruct  far *page;\r
 633 \r
 634         gvar->pm.fi.PageFile = open(gvar->pm.fi.PageFileName,O_RDONLY + O_BINARY);\r
 635         if (gvar->pm.fi.PageFile == -1)\r
 636         {\r
 637                 Quit("PML_OpenPageFile: Unable to open page file");\r
 638                 //return;\r
 639         }\r
 640 \r
 641         // Read in header variables\r
 642         read(gvar->pm.fi.PageFile,&gvar->pm.fi.ChunksInFile,sizeof(gvar->pm.fi.ChunksInFile));\r
 643         read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSpriteStart,sizeof(gvar->pm.fi.PMSpriteStart));\r
 644         read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSoundStart,sizeof(gvar->pm.fi.PMSoundStart));\r
 645 \r
 646         // Allocate and clear the page list\r
 647         gvar->pm.PMNumBlocks = gvar->pm.fi.ChunksInFile;\r
 648         MM_GetPtr((memptr *)gvar->pm.PMSegPages, sizeof(PageListStruct) * (gvar->pm.PMNumBlocks), gvar);\r
 649         MM_SetLock((memptr *)gvar->pm.PMSegPages,true, gvar);\r
 650         gvar->pm.PMPages = (PageListStruct far *)gvar->pm.PMSegPages;\r
 651         _fmemset(gvar->pm.PMPages,0,sizeof(PageListStruct) * gvar->pm.PMNumBlocks);\r
 652 \r
 653         // Read in the chunk offsets\r
 654         size = sizeof(dword) * gvar->pm.fi.ChunksInFile;\r
 655         MM_GetPtr(&buf, size, gvar);\r
 656         if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))\r
 657         {\r
 658                 Quit("PML_OpenPageFile: Offset read failed");\r
 659                 //return;\r
 660         }\r
 661         offsetptr = (dword far *)buf;\r
 662         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 663                 page->offset = *offsetptr++;\r
 664         MM_FreePtr(&buf, gvar);\r
 665 \r
 666         // Read in the chunk lengths\r
 667         size = sizeof(word) * gvar->pm.fi.ChunksInFile;\r
 668         MM_GetPtr(&buf,size, gvar);\r
 669         if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))\r
 670         {\r
 671                 Quit("PML_OpenPageFile: Length read failed");\r
 672                 //return;\r
 673         }\r
 674         lengthptr = (word far *)buf;\r
 675         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 676                 page->length = *lengthptr++;\r
 677         MM_FreePtr(&buf, gvar);\r
 678 }\r
 679 \r
 680 //\r
 681 //  PML_ClosePageFile() - Closes the page file\r
 682 //\r
 683 void\r
 684 PML_ClosePageFile(global_game_variables_t *gvar)\r
 685 {\r
 686         if (gvar->pm.fi.PageFile != -1)\r
 687                 close(gvar->pm.fi.PageFile);\r
 688         if (gvar->pm.PMSegPages)\r
 689         {\r
 690                 MM_SetLock((memptr)gvar->pm.PMSegPages,false, gvar);\r
 691                 MM_FreePtr((memptr)gvar->pm.PMSegPages, gvar);\r
 692         }\r
 693 }\r
 694 \r
 695 /////////////////////////////////////////////////////////////////////////////\r
 696 //\r
 697 //      Allocation, etc., code\r
 698 //\r
 699 /////////////////////////////////////////////////////////////////////////////\r
 700 \r
 701 //\r
 702 //      PML_GetEMSAddress()\r
 703 //\r
 704 //              Page is in EMS, so figure out which EMS physical page should be used\r
 705 //              to map our page in. If normal page, use EMS physical page 3, else\r
 706 //              use the physical page specified by the lock type\r
 707 //\r
 708 #ifndef __DEBUG_2__\r
 709 #pragma argsused        // DEBUG - remove lock parameter\r
 710 memptr\r
 711 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)\r
 712 {\r
 713         int             i,emspage;\r
 714         word    emsoff,emsbase,offset;\r
 715 \r
 716         emsoff = page & (PMEMSSubPage - 1);\r
 717         emsbase = page - emsoff;\r
 718 \r
 719         emspage = -1;\r
 720         // See if this page is already mapped in\r
 721         for (i = 0;i < EMSFrameCount;i++)\r
 722         {\r
 723                 if (gvar->pm.emm.EMSList[i].baseEMSPage == emsbase)\r
 724                 {\r
 725                         emspage = i;    // Yep - don't do a redundant remapping\r
 726                         break;\r
 727                 }\r
 728         }\r
 729 \r
 730         // If page isn't already mapped in, find LRU EMS frame, and use it\r
 731         if (emspage == -1)\r
 732         {\r
 733                 dword last = LONG_MAX;\r
 734                 for (i = 0;i < EMSFrameCount;i++)\r
 735                 {\r
 736                         if (gvar->pm.emm.EMSList[i].lastHit < last)\r
 737                         {\r
 738                                 emspage = i;\r
 739                                 last = gvar->pm.emm.EMSList[i].lastHit;\r
 740                         }\r
 741                 }\r
 742 \r
 743                 gvar->pm.emm.EMSList[emspage].baseEMSPage = emsbase;\r
 744                 PML_MapEMS(page / PMEMSSubPage,emspage, gvar);\r
 745         }\r
 746 \r
 747         if (emspage == -1)\r
 748                 Quit("PML_GetEMSAddress: EMS find failed");\r
 749 \r
 750         gvar->pm.emm.EMSList[emspage].lastHit = gvar->pm.PMFrameCount;\r
 751         offset = emspage * EMSPageSizeSeg;\r
 752         offset += emsoff * PMPageSizeSeg;\r
 753         return((memptr)(gvar->pm.emm.EMSPageFrame + offset));\r
 754 }\r
 755 #else\r
 756 memptr\r
 757 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)\r
 758 {\r
 759         word    emspage;\r
 760 \r
 761         emspage = (lock < pml_EMSLock)? 3 : (lock - pml_EMSLock);\r
 762 \r
 763         PML_MapEMS(page / PMEMSSubPage,emspage);\r
 764 \r
 765         return((memptr)(EMSPageFrame + (emspage * EMSPageSizeSeg)\r
 766                         + ((page & (PMEMSSubPage - 1)) * PMPageSizeSeg)));\r
 767 }\r
 768 #endif\r
 769 \r
 770 //\r
 771 //      PM_GetPageAddress() - Returns the address of a given page\r
 772 //              Maps in EMS if necessary\r
 773 //              Returns nil if block isn't cached into Main Memory or EMS\r
 774 //\r
 775 //\r
 776 memptr\r
 777 PM_GetPageAddress(int pagenum, global_game_variables_t *gvar)\r
 778 {\r
 779         PageListStruct  far *page;\r
 780 \r
 781         page = &gvar->pm.PMPages[pagenum];\r
 782         if (page->mainPage != -1)\r
 783                 return(gvar->pm.mm.MainMemPages[page->mainPage]);\r
 784         else if (page->emsPage != -1)\r
 785                 return(PML_GetEMSAddress(page->emsPage,page->locked, gvar));\r
 786         else\r
 787                 return(nil);\r
 788 }\r
 789 \r
 790 //\r
 791 //      PML_GiveLRUPage() - Returns the page # of the least recently used\r
 792 //              present & unlocked main/EMS page (or main page if mainonly is true)\r
 793 //\r
 794 int\r
 795 PML_GiveLRUPage(boolean mainonly, global_game_variables_t *gvar)\r
 796 {\r
 797         int                             i,lru;\r
 798         long                    last;\r
 799         PageListStruct  far *page;\r
 800 \r
 801         for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 802         {\r
 803                 if\r
 804                 (\r
 805                         (page->lastHit < last)\r
 806                 &&      ((page->emsPage != -1) || (page->mainPage != -1))\r
 807                 &&      (page->locked == pml_Unlocked)\r
 808                 &&      (!(mainonly && (page->mainPage == -1)))\r
 809                 )\r
 810                 {\r
 811                         last = page->lastHit;\r
 812                         lru = i;\r
 813                 }\r
 814         }\r
 815 \r
 816         if (lru == -1)\r
 817                 Quit("PML_GiveLRUPage: LRU Search failed");\r
 818         return(lru);\r
 819 }\r
 820 \r
 821 //\r
 822 //      PML_GiveLRUXMSPage() - Returns the page # of the least recently used\r
 823 //              (and present) XMS page.\r
 824 //      This routine won't return the XMS page protected (by gvar->pm.xmm.XMSProtectPage)\r
 825 //\r
 826 int\r
 827 PML_GiveLRUXMSPage(global_game_variables_t *gvar)\r
 828 {\r
 829         int                             i,lru;\r
 830         long                    last;\r
 831         PageListStruct  far *page;\r
 832 \r
 833         for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 834         {\r
 835                 if\r
 836                 (\r
 837                         (page->xmsPage != -1)\r
 838                 &&      (page->lastHit < last)\r
 839                 &&      (i != gvar->pm.xmm.XMSProtectPage)\r
 840                 )\r
 841                 {\r
 842                         last = page->lastHit;\r
 843                         lru = i;\r
 844                 }\r
 845         }\r
 846         return(lru);\r
 847 }\r
 848 \r
 849 //\r
 850 //      PML_PutPageInXMS() - If page isn't in XMS, find LRU XMS page and replace\r
 851 //              it with the main/EMS page\r
 852 //\r
 853 void\r
 854 PML_PutPageInXMS(int pagenum, global_game_variables_t *gvar)\r
 855 {\r
 856         int                             usexms;\r
 857         PageListStruct  far *page;\r
 858 \r
 859         if (!gvar->pm.xmm.XMSPresent)\r
 860                 return;\r
 861 \r
 862         page = &gvar->pm.PMPages[pagenum];\r
 863         if (page->xmsPage != -1)\r
 864                 return;                                 // Already in XMS\r
 865 \r
 866         if (gvar->pm.XMSPagesUsed < gvar->pm.xmm.XMSPagesAvail)\r
 867                 page->xmsPage = gvar->pm.XMSPagesUsed++;\r
 868         else\r
 869         {\r
 870                 usexms = PML_GiveLRUXMSPage(gvar);\r
 871                 if (usexms == -1)\r
 872                         Quit("PML_PutPageInXMS: No XMS LRU");\r
 873                 page->xmsPage = gvar->pm.PMPages[usexms].xmsPage;\r
 874                 gvar->pm.PMPages[usexms].xmsPage = -1;\r
 875         }\r
 876         PML_CopyToXMS(PM_GetPageAddress(pagenum, gvar),page->xmsPage,page->length, gvar);\r
 877 }\r
 878 \r
 879 //\r
 880 //      PML_TransferPageSpace() - A page is being replaced, so give the new page\r
 881 //              the old one's address space. Returns the address of the new page.\r
 882 //\r
 883 memptr\r
 884 PML_TransferPageSpace(int orig,int new, global_game_variables_t *gvar)\r
 885 {\r
 886         memptr                  addr;\r
 887         PageListStruct  far *origpage,far *newpage;\r
 888 \r
 889         if (orig == new)\r
 890                 Quit("PML_TransferPageSpace: Identity replacement");\r
 891 \r
 892         origpage = &gvar->pm.PMPages[orig];\r
 893         newpage = &gvar->pm.PMPages[new];\r
 894 \r
 895         if (origpage->locked != pml_Unlocked)\r
 896                 Quit("PML_TransferPageSpace: Killing locked page");\r
 897 \r
 898         if ((origpage->emsPage == -1) && (origpage->mainPage == -1))\r
 899                 Quit("PML_TransferPageSpace: Reusing non-existent page");\r
 900 \r
 901         // Copy page that's about to be purged into XMS\r
 902         PML_PutPageInXMS(orig, gvar);\r
 903 \r
 904         // Get the address, and force EMS into a physical page if necessary\r
 905         addr = PM_GetPageAddress(orig, gvar);\r
 906 \r
 907         // Steal the address\r
 908         newpage->emsPage = origpage->emsPage;\r
 909         newpage->mainPage = origpage->mainPage;\r
 910 \r
 911         // Mark replaced page as purged\r
 912         origpage->mainPage = origpage->emsPage = -1;\r
 913 \r
 914         if (!addr)\r
 915                 Quit("PML_TransferPageSpace: Zero replacement");\r
 916 \r
 917         return(addr);\r
 918 }\r
 919 \r
 920 //\r
 921 //      PML_GetAPageBuffer() - A page buffer is needed. Either get it from the\r
 922 //              main/EMS free pool, or use PML_GiveLRUPage() to find which page to\r
 923 //              steal the buffer from. Returns a far pointer to the page buffer, and\r
 924 //              sets the fields inside the given page structure appropriately.\r
 925 //              If mainonly is true, free EMS will be ignored, and only main pages\r
 926 //              will be looked at by PML_GiveLRUPage().\r
 927 //\r
 928 byte far *\r
 929 PML_GetAPageBuffer(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
 930 {\r
 931         byte                    far *addr = nil;\r
 932         int                             i,n;\r
 933         PMBlockAttr             *used;\r
 934         PageListStruct  far *page;\r
 935 \r
 936         page = &gvar->pm.PMPages[pagenum];\r
 937         if ((gvar->pm.EMSPagesUsed < gvar->pm.emm.EMSPagesAvail) && !mainonly)\r
 938         {\r
 939                 // There's remaining EMS - use it\r
 940                 page->emsPage = gvar->pm.EMSPagesUsed++;\r
 941                 addr = PML_GetEMSAddress(page->emsPage,page->locked, gvar);\r
 942         }\r
 943         else if (gvar->pm.MainPagesUsed < gvar->pm.mm.MainPagesAvail)\r
 944         {\r
 945                 // There's remaining main memory - use it\r
 946                 for (i = 0,n = -1,used = gvar->pm.mm.MainMemUsed;i < PMMaxMainMem;i++,used++)\r
 947                 {\r
 948                         if ((*used & pmba_Allocated) && !(*used & pmba_Used))\r
 949                         {\r
 950                                 n = i;\r
 951                                 *used |= pmba_Used;\r
 952                                 break;\r
 953                         }\r
 954                 }\r
 955                 if (n == -1)\r
 956                         Quit("PML_GetPageBuffer: MainPagesAvail lied");\r
 957                 addr = gvar->pm.mm.MainMemPages[n];\r
 958                 if (!addr)\r
 959                         Quit("PML_GetPageBuffer: Purged main block");\r
 960                 page->mainPage = n;\r
 961                 gvar->pm.MainPagesUsed++;\r
 962         }\r
 963         else\r
 964                 addr = PML_TransferPageSpace(PML_GiveLRUPage(mainonly, gvar),pagenum, gvar);\r
 965 \r
 966         if (!addr)\r
 967                 Quit("PML_GetPageBuffer: Search failed");\r
 968         return(addr);\r
 969 }\r
 970 \r
 971 //\r
 972 //      PML_GetPageFromXMS() - If page is in XMS, find LRU main/EMS page and\r
 973 //              replace it with the page from XMS. If mainonly is true, will only\r
 974 //              search for LRU main page.\r
 975 //      XMSProtectPage is set to the page to be retrieved from XMS, so that if\r
 976 //              the page from which we're stealing the main/EMS from isn't in XMS,\r
 977 //              it won't copy over the page that we're trying to get from XMS.\r
 978 //              (pages that are being purged are copied into XMS, if possible)\r
 979 //\r
 980 memptr\r
 981 PML_GetPageFromXMS(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
 982 {\r
 983         byte                    far *checkaddr;\r
 984         memptr                  addr = nil;\r
 985         PageListStruct  far *page;\r
 986 \r
 987         page = &gvar->pm.PMPages[pagenum];\r
 988         if (gvar->pm.xmm.XMSPresent && (page->xmsPage != -1))\r
 989         {\r
 990                 gvar->pm.xmm.XMSProtectPage = pagenum;\r
 991                 checkaddr = PML_GetAPageBuffer(pagenum,mainonly, gvar);\r
 992                 if (FP_OFF(checkaddr))\r
 993                         Quit("PML_GetPageFromXMS: Non segment pointer");\r
 994                 addr = (memptr)FP_SEG(checkaddr);\r
 995                 PML_CopyFromXMS(addr,page->xmsPage,page->length, gvar);\r
 996                 gvar->pm.xmm.XMSProtectPage = -1;\r
 997         }\r
 998 \r
 999         return(addr);\r
1000 }\r
1001 \r
1002 //\r
1003 //      PML_LoadPage() - A page is not in main/EMS memory, and it's not in XMS.\r
1004 //              Load it into either main or EMS. If mainonly is true, the page will\r
1005 //              only be loaded into main.\r
1006 //\r
1007 void\r
1008 PML_LoadPage(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
1009 {\r
1010         byte                    far *addr;\r
1011         PageListStruct  far *page;\r
1012 \r
1013         addr = PML_GetAPageBuffer(pagenum,mainonly, gvar);\r
1014         page = &gvar->pm.PMPages[pagenum];\r
1015         PML_ReadFromFile(addr,page->offset,page->length, gvar);\r
1016 }\r
1017 \r
1018 //\r
1019 //      PM_GetPage() - Returns the address of the page, loading it if necessary\r
1020 //              First, check if in Main Memory or EMS\r
1021 //              Then, check XMS\r
1022 //              If not in XMS, load into Main Memory or EMS\r
1023 //\r
1024 #pragma warn -pia\r
1025 memptr\r
1026 PM_GetPage(int pagenum, global_game_variables_t *gvar)\r
1027 {\r
1028         memptr  result;\r
1029 \r
1030         if (pagenum >= gvar->pm.fi.ChunksInFile)\r
1031                 Quit("PM_GetPage: Invalid page request");\r
1032 \r
1033 #ifdef __DEBUG_2__      // for debugging\r
1034         __asm {\r
1035                 mov     dx,STATUS_REGISTER_1\r
1036                 in      al,dx\r
1037                 mov     dx,ATR_INDEX\r
1038                 mov     al,ATR_OVERSCAN\r
1039                 out     dx,al\r
1040                 mov     al,10   // bright green\r
1041                 out     dx,al\r
1042         }\r
1043 #endif\r
1044 \r
1045         if (!(result = PM_GetPageAddress(pagenum, gvar)))\r
1046         {\r
1047                 boolean mainonly = (pagenum >= gvar->pm.fi.PMSoundStart);\r
1048 if (!gvar->pm.PMPages[pagenum].offset)  // JDC: sparse page\r
1049         Quit ("Tried to load a sparse page!");\r
1050                 if (!(result = PML_GetPageFromXMS(pagenum,mainonly, gvar)))\r
1051                 {\r
1052                         if (gvar->pm.PMPages[pagenum].lastHit ==  gvar->pm.PMFrameCount)\r
1053                                 gvar->pm.PMThrashing++;\r
1054 \r
1055                         PML_LoadPage(pagenum,mainonly, gvar);\r
1056                         result = PM_GetPageAddress(pagenum, gvar);\r
1057                 }\r
1058         }\r
1059         gvar->pm.PMPages[pagenum].lastHit =  gvar->pm.PMFrameCount;\r
1060 \r
1061 #ifdef __DEBUG_2__      // for debugging\r
1062         __asm{\r
1063                 mov     dx,STATUS_REGISTER_1\r
1064                 in      al,dx\r
1065                 mov     dx,ATR_INDEX\r
1066                 mov     al,ATR_OVERSCAN\r
1067                 out     dx,al\r
1068                 mov     al,3    // blue\r
1069                 out     dx,al\r
1070                 mov     al,0x20 // normal\r
1071                 out     dx,al\r
1072 #endif\r
1073 \r
1074         return(result);\r
1075 }\r
1076 #pragma warn +pia\r
1077 \r
1078 //\r
1079 //      PM_SetPageLock() - Sets the lock type on a given page\r
1080 //              pml_Unlocked: Normal, page can be purged\r
1081 //              pml_Locked: Cannot be purged\r
1082 //              pml_EMS?: Same as pml_Locked, but if in EMS, use the physical page\r
1083 //                                      specified when returning the address. For sound stuff.\r
1084 //\r
1085 void\r
1086 PM_SetPageLock(int pagenum,PMLockType lock, global_game_variables_t *gvar)\r
1087 {\r
1088         if (pagenum < gvar->pm.fi.PMSoundStart)\r
1089                 Quit("PM_SetPageLock: Locking/unlocking non-sound page");\r
1090 \r
1091         gvar->pm.PMPages[pagenum].locked = lock;\r
1092 }\r
1093 \r
1094 //\r
1095 //      PM_Preload() - Loads as many pages as possible into all types of memory.\r
1096 //              Calls the update function after each load, indicating the current\r
1097 //              page, and the total pages that need to be loaded (for thermometer).\r
1098 //\r
1099 void\r
1100 PM_Preload(boolean (*update)(word current,word total), global_game_variables_t *gvar)\r
1101 {\r
1102         int                             i,j,\r
1103                                         page,oogypage;\r
1104         word                    current,total,\r
1105                                         totalnonxms,totalxms,\r
1106                                         mainfree,maintotal,\r
1107                                         emsfree,emstotal,\r
1108                                         xmsfree,xmstotal;\r
1109         memptr                  addr;\r
1110         PageListStruct  far *p;\r
1111 \r
1112         mainfree = (gvar->pm.mm.MainPagesAvail - gvar->pm.MainPagesUsed) + (gvar->pm.emm.EMSPagesAvail - gvar->pm.EMSPagesUsed);\r
1113         xmsfree = (gvar->pm.xmm.XMSPagesAvail - gvar->pm.XMSPagesUsed);\r
1114 \r
1115         xmstotal = maintotal = 0;\r
1116 \r
1117         for (i = 0;i < gvar->pm.fi.ChunksInFile;i++)\r
1118         {\r
1119                 if (!gvar->pm.PMPages[i].offset)\r
1120                         continue;                       // sparse\r
1121 \r
1122                 if ( gvar->pm.PMPages[i].emsPage != -1 || gvar->pm.PMPages[i].mainPage != -1 )\r
1123                         continue;                       // already in main mem\r
1124 \r
1125                 if ( mainfree )\r
1126                 {\r
1127                         maintotal++;\r
1128                         mainfree--;\r
1129                 }\r
1130                 else if ( xmsfree && (gvar->pm.PMPages[i].xmsPage == -1) )\r
1131                 {\r
1132                         xmstotal++;\r
1133                         xmsfree--;\r
1134                 }\r
1135         }\r
1136 \r
1137 \r
1138         total = maintotal + xmstotal;\r
1139 \r
1140         if (!total)\r
1141                 return;\r
1142 \r
1143         page = 0;\r
1144         current = 0;\r
1145 \r
1146 //\r
1147 // cache main/ems blocks\r
1148 //\r
1149         while (maintotal)\r
1150         {\r
1151                 while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].mainPage != -1\r
1152                         ||      gvar->pm.PMPages[page].emsPage != -1 )\r
1153                         page++;\r
1154 \r
1155                 if (page >= gvar->pm.fi.ChunksInFile)\r
1156                         Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");\r
1157 \r
1158                 PM_GetPage(page, gvar);\r
1159 \r
1160                 page++;\r
1161                 current++;\r
1162                 maintotal--;\r
1163                 update(current,total);\r
1164         }\r
1165 \r
1166 //\r
1167 // load stuff to XMS\r
1168 //\r
1169         if (xmstotal)\r
1170         {\r
1171                 for (oogypage = 0 ; gvar->pm.PMPages[oogypage].mainPage == -1 ; oogypage++)\r
1172                 ;\r
1173                 addr = PM_GetPage(oogypage, gvar);\r
1174                 if (!addr)\r
1175                         Quit("PM_Preload: XMS buffer failed");\r
1176 \r
1177                 while (xmstotal)\r
1178                 {\r
1179                         while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].xmsPage != -1 )\r
1180                                 page++;\r
1181 \r
1182                         if (page >= gvar->pm.fi.ChunksInFile)\r
1183                                 Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");\r
1184 \r
1185                         p = &gvar->pm.PMPages[page];\r
1186 \r
1187                         p->xmsPage = gvar->pm.XMSPagesUsed++;\r
1188                         if (gvar->pm.XMSPagesUsed > gvar->pm.xmm.XMSPagesAvail)\r
1189                                 Quit("PM_Preload: Exceeded XMS pages");\r
1190                         if (p->length > PMPageSize)\r
1191                                 Quit("PM_Preload: Page too long");\r
1192 \r
1193                         PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);\r
1194                         PML_CopyToXMS((byte far *)addr,p->xmsPage,p->length, gvar);\r
1195 \r
1196                         page++;\r
1197                         current++;\r
1198                         xmstotal--;\r
1199                         update(current,total);\r
1200                 }\r
1201 \r
1202                 p = &gvar->pm.PMPages[oogypage];\r
1203                 PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);\r
1204         }\r
1205 \r
1206         update(total,total);\r
1207 }\r
1208 \r
1209 /////////////////////////////////////////////////////////////////////////////\r
1210 //\r
1211 //      General code\r
1212 //\r
1213 /////////////////////////////////////////////////////////////////////////////\r
1214 \r
1215 //\r
1216 //      PM_NextFrame() - Increments the frame counter and adjusts the thrash\r
1217 //              avoidence variables\r
1218 //\r
1219 //              If currently in panic mode (to avoid thrashing), check to see if the\r
1220 //                      appropriate number of frames have passed since the last time that\r
1221 //                      we would have thrashed. If so, take us out of panic mode.\r
1222 //\r
1223 //\r
1224 void\r
1225 PM_NextFrame(global_game_variables_t *gvar)\r
1226 {\r
1227         int     i;\r
1228 \r
1229         // Frame count overrun - kill the LRU hit entries & reset frame count\r
1230         if (++gvar->pm.PMFrameCount >= LONG_MAX - 4)\r
1231         {\r
1232                 for (i = 0;i < gvar->pm.PMNumBlocks;i++)\r
1233                         gvar->pm.PMPages[i].lastHit = 0;\r
1234                 gvar->pm.PMFrameCount = 0;\r
1235         }\r
1236 \r
1237 //#if 0\r
1238         for (i = 0;i < gvar->pm.fi.PMSoundStart;i++)\r
1239         {\r
1240                 if (gvar->pm.PMPages[i].locked)\r
1241                 {\r
1242                         char buf[40];\r
1243                         sprintf(buf,"PM_NextFrame: Page %d is locked",i);\r
1244                         Quit(buf);\r
1245                 }\r
1246         }\r
1247 //#endif\r
1248 \r
1249         if (gvar->pm.PMPanicMode)\r
1250         {\r
1251                 // DEBUG - set border color\r
1252                 if ((!gvar->pm.PMThrashing) && (!--gvar->pm.PMPanicMode))\r
1253                 {\r
1254                         // DEBUG - reset border color\r
1255                 }\r
1256         }\r
1257         if (gvar->pm.PMThrashing >= PMThrashThreshold)\r
1258                 gvar->pm.PMPanicMode = PMUnThrashThreshold;\r
1259         gvar->pm.PMThrashing = false;\r
1260 }\r
1261 \r
1262 //\r
1263 //      PM_Reset() - Sets up caching structures\r
1264 //\r
1265 void\r
1266 PM_Reset(global_game_variables_t *gvar)\r
1267 {\r
1268         int                             i;\r
1269         PageListStruct  far *page;\r
1270 \r
1271         gvar->pm.xmm.XMSPagesAvail = gvar->pm.xmm.XMSAvail / PMPageSizeKB;\r
1272 \r
1273         gvar->pm.emm.EMSPagesAvail = gvar->pm.emm.EMSAvail * (EMSPageSizeKB / PMPageSizeKB);\r
1274         gvar->pm.emm.EMSPhysicalPage = 0;\r
1275 \r
1276         gvar->pm.MainPagesUsed = gvar->pm.EMSPagesUsed = gvar->pm.XMSPagesUsed = 0;\r
1277 \r
1278         gvar->pm.PMPanicMode = false;\r
1279 \r
1280         gvar->pm.fi.PageFile = -1;\r
1281         gvar->pm.xmm.XMSProtectPage = -1;\r
1282 \r
1283         // Initialize page list\r
1284         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.PMNumBlocks;i++,page++)\r
1285         {\r
1286                 page->mainPage = -1;\r
1287                 page->emsPage = -1;\r
1288                 page->xmsPage = -1;\r
1289                 page->locked = false;\r
1290         }\r
1291 }\r
1292 \r
1293 //\r
1294 //      PM_Startup() - Start up the Page Mgr\r
1295 //\r
1296 void\r
1297 PM_Startup(global_game_variables_t *gvar)\r
1298 {\r
1299         boolean nomain,noems,noxms;\r
1300         int             i;\r
1301 \r
1302         if (gvar->pm.PMStarted)\r
1303                 return;\r
1304 \r
1305         strcat(&(gvar->pm.fi.PageFileName), "VSWAP.");\r
1306 \r
1307         nomain = noems = noxms = false;\r
1308         for (i = 1;i <\r
1309 #ifdef __WATCOMC__\r
1310         __argc\r
1311 #endif\r
1312 #ifdef __BORLANDC__\r
1313         _argc\r
1314 #endif\r
1315         ;i++)\r
1316         {\r
1317                 switch (US_CheckParm(\r
1318 #ifdef __WATCOMC__\r
1319         __argv[i]\r
1320 #endif\r
1321 #ifdef __BORLANDC__\r
1322         _argv[i]\r
1323 #endif\r
1324                 ,ParmStrings))\r
1325                 {\r
1326                 case 0:\r
1327                         nomain = true;\r
1328                         break;\r
1329                 case 1:\r
1330                         noems = true;\r
1331                         break;\r
1332                 case 2:\r
1333                         noxms = true;\r
1334                         break;\r
1335                 }\r
1336         }\r
1337 \r
1338         PML_OpenPageFile(gvar);\r
1339 \r
1340         if (!noems)\r
1341                 PML_StartupEMS(gvar);\r
1342         if (!noxms)\r
1343                 PML_StartupXMS(gvar);\r
1344 \r
1345         if (nomain && !gvar->pm.emm.EMSPresent)\r
1346         {\r
1347                 Quit("PM_Startup: No main or EMS\n");\r
1348                 //return;\r
1349         }\r
1350         else\r
1351                 PML_StartupMainMem(gvar);\r
1352 \r
1353         PM_Reset(gvar);\r
1354 \r
1355         gvar->pm.PMStarted = true;\r
1356 }\r
1357 \r
1358 //\r
1359 //      PM_Shutdown() - Shut down the Page Mgr\r
1360 //\r
1361 void\r
1362 PM_Shutdown(global_game_variables_t *gvar)\r
1363 {\r
1364         PML_ShutdownXMS(gvar);\r
1365         PML_ShutdownEMS(gvar);\r
1366 \r
1367         if (!gvar->pm.PMStarted)\r
1368                 return;\r
1369 \r
1370         PML_ClosePageFile(gvar);\r
1371 \r
1372         PML_ShutdownMainMem(gvar);\r
1373 }\r