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