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 #ifdef __DEBUG__\r
  33 boolean debugpm=0;\r
  34 #endif\r
  35 \r
  36 //      Main Mem specific variables\r
  37         boolean                 MainPresent;\r
  38 /*      memptr                  MainMemPages[PMMaxMainMem];\r
  39         PMBlockAttr             gvar->pm.mm.MainMemUsed[PMMaxMainMem];\r
  40         int                             gvar->pm.mm.MainPagesAvail;*/\r
  41 \r
  42 //      EMS specific variables\r
  43         boolean                 EMSPresent;\r
  44 /*      word                    gvar->pm.emm.EMSAvail,gvar->pm.emm.EMSPagesAvail,gvar->pm.emm.EMSHandle,\r
  45                                         gvar->pm.emm.EMSPageFrame,gvar->pm.emm.EMSPhysicalPage;\r
  46         gvar->pm.emm.EMSListStruct      gvar->pm.emm.EMSList[EMSFrameCount];*/\r
  47 \r
  48 //      XMS specific variables\r
  49         boolean                 XMSPresent;\r
  50         //word                  gvar->pm.xmm.XMSAvail,gvar->pm.xmm.XMSPagesAvail,gvar->pm.xmm.XMSHandle;\r
  51         word            XMSDriver;\r
  52 /*      int                             gvar->pm.xmm.XMSProtectPage = -1;\r
  53 \r
  54 //      File specific variables\r
  55         char                    gvar->pm.fi.PageFileName[13] = {"VSWAP."};\r
  56         int                             PageFile = -1;\r
  57         word                    gvar->pm.fi.ChunksInFile;\r
  58         word                    PMSpriteStart,PMSoundStart;*/\r
  59 \r
  60 //      General usage variables\r
  61         boolean                 PMStarted;/*,\r
  62                                         gvar->pm.PMPanicMode,\r
  63                                         gvar->pm.PMThrashing;\r
  64         word                    gvar->pm.XMSPagesUsed,\r
  65                                         gvar->pm.EMSPagesUsed,\r
  66                                         MainPagesUsed,\r
  67                                         gvar->pm.PMNumBlocks;\r
  68         long                    PMFrameCount;\r
  69         PageListStruct  far *gvar->pm.PMPages,\r
  70                                         _seg *gvar->pm.PMSegPages;*/\r
  71 \r
  72 static  char            *ParmStrings[] = {"nomain","noems","noxms",nil};\r
  73 \r
  74 /////////////////////////////////////////////////////////////////////////////\r
  75 //\r
  76 //      EMS Management code\r
  77 //\r
  78 /////////////////////////////////////////////////////////////////////////////\r
  79 \r
  80 //\r
  81 //      PML_MapEMS() - Maps a logical page to a physical page\r
  82 //\r
  83 byte\r
  84 PML_MapEMS(word logical, byte physical, global_game_variables_t *gvar)\r
  85 {\r
  86         byte    str[160];\r
  87         unsigned        EMShandle;\r
  88         byte err;\r
  89         boolean errorflag=false;\r
  90         int     i;\r
  91         EMShandle=gvar->pm.emm.EMSHandle;\r
  92 \r
  93         __asm {\r
  94                 mov     ah,EMS_MAPPAGE\r
  95                 mov     al,physical\r
  96                 mov     bx,logical\r
  97                 mov     dx,EMShandle\r
  98                 int     EMS_INT\r
  99                 or      ah,ah\r
 100                 jnz     error\r
 101                 jmp End\r
 102 #ifdef __BORLANDC__\r
 103         }\r
 104 #endif\r
 105                 error:\r
 106 #ifdef __BORLANDC__\r
 107         __asm {\r
 108 #endif\r
 109                 mov     err,ah\r
 110                 mov     errorflag,1\r
 111 #ifdef __BORLANDC__\r
 112         }\r
 113 #endif\r
 114                 End:\r
 115 #ifdef __WATCOMC__\r
 116         }\r
 117 #endif\r
 118         if(errorflag==true)\r
 119         {\r
 120                 strcpy(str,"MM_MapEMS: EMS error ");\r
 121                 MM_EMSerr(str, err);\r
 122                 printf("%s\n",str);\r
 123                 Quit("PML_MapEMS: Page mapping failed\n");\r
 124                 return err;\r
 125         }\r
 126         return 0;\r
 127 }\r
 128 \r
 129 //\r
 130 //      PML_StartupEMS() - Sets up EMS for Page Mgr's use\r
 131 //              Checks to see if EMS driver is present\r
 132 //      Verifies that EMS hardware is present\r
 133 //              Make sure that EMS version is 3.2 or later\r
 134 //              If there's more than our minimum (2 pages) available, allocate it (up\r
 135 //                      to the maximum we need)\r
 136 //\r
 137 \r
 138 boolean\r
 139 PML_StartupEMS(global_game_variables_t *gvar)\r
 140 {\r
 141         int             i;\r
 142         long    size;\r
 143         byte    str[64];\r
 144         byte err;\r
 145 \r
 146         boolean errorflag=0;\r
 147         static char     emmname[] = "EMMXXXX0"; //fix by andrius4669\r
 148         unsigned int EMSVer = 0;\r
 149         unsigned        totalEMSpages,freeEMSpages,EMSPageFrame,EMSHandle,EMSAvail;\r
 150         totalEMSpages = freeEMSpages = EMSPageFrame = 0;\r
 151         EMSPresent = false;                     // Assume that we'll fail\r
 152         gvar->pm.emm.EMSAvail = 0;\r
 153 \r
 154         __asm {\r
 155                 mov     dx,OFFSET emmname       //fix by andrius4669\r
 156                 mov     ax,0x3d00\r
 157                 int     EMS_INT         // try to open EMMXXXX0 device\r
 158                 jc      error1\r
 159 \r
 160                 mov     bx,ax\r
 161                 mov     ax,0x4400\r
 162 \r
 163                 int     EMS_INT         // get device info\r
 164                 jc      error1\r
 165 \r
 166                 and     dx,0x80\r
 167                 jz      error1\r
 168 \r
 169                 mov     ax,0x4407\r
 170 \r
 171                 int     EMS_INT         // get status\r
 172                 jc      error1\r
 173                 or      al,al\r
 174                 jz      error1\r
 175 \r
 176                 mov     ah,0x3e\r
 177                 int     EMS_INT         // close handle\r
 178                 jc      error1\r
 179 \r
 180                 mov     ah,EMS_STATUS\r
 181                 int     EMS_INT\r
 182                 jc      error1                  // make sure EMS hardware is present\r
 183 \r
 184                 mov     ah,EMS_VERSION\r
 185                 int     EMS_INT                 // only work on EMS 3.2 or greater (silly, but...)\r
 186                 or      ah,ah\r
 187                 jnz     error1\r
 188                 mov     [EMSVer],ax             //      set EMSVer\r
 189                 cmp     al,0x32                 // only work on ems 3.2 or greater\r
 190                 jb      error1\r
 191 \r
 192                 mov     ah,EMS_GETFRAME\r
 193                 int     EMS_INT                 // find the page frame address\r
 194                 or      ah,ah\r
 195                 jnz     error1\r
 196                 mov     [EMSPageFrame],bx\r
 197 \r
 198                 mov     ah,EMS_GETPAGES\r
 199                 int     EMS_INT                 // find out how much EMS is there\r
 200                 or      ah,ah\r
 201                 jnz     error1\r
 202                 or      bx,bx\r
 203                 jz      noEMS                   // no EMS at all to allocate\r
 204                 cmp     bx,2\r
 205                 jl      noEMS                   // Require at least 2 pages (32k)\r
 206                 mov     [totalEMSpages],dx\r
 207                 mov     [freeEMSpages],bx\r
 208                 mov     [EMSAvail],bx\r
 209                 jmp End1\r
 210 #ifdef __BORLANDC__\r
 211         }\r
 212 #endif\r
 213         error1:\r
 214 #ifdef __BORLANDC__\r
 215         __asm {\r
 216 #endif\r
 217                 mov     err,ah\r
 218                 mov     errorflag,1\r
 219                 jmp End1\r
 220 #ifdef __BORLANDC__\r
 221         }\r
 222 #endif\r
 223 noEMS:\r
 224 End1:\r
 225 #ifdef __WATCOMC__\r
 226         }\r
 227 #endif\r
 228 /*\r
 229         if(errorflag==false)\r
 230         {\r
 231                 // Don't hog all available EMS\r
 232                 size = gvar->pm.emm.EMSAvail * (long)EMSPageSize;\r
 233                 if (size - (EMSPageSize * 2) > (gvar->pm.fi.ChunksInFile * (long)PMPageSize))\r
 234                 {\r
 235                         size = (gvar->pm.fi.ChunksInFile * (long)PMPageSize) + EMSPageSize;\r
 236                         gvar->pm.emm.EMSAvail = size / EMSPageSize;\r
 237                 }\r
 238         }\r
 239 */\r
 240         __asm {\r
 241                 mov     ah,EMS_ALLOCPAGES\r
 242                 mov     bx,[EMSAvail];\r
 243                 int     EMS_INT\r
 244                 or      ah,ah\r
 245                 jnz     error2\r
 246                 mov     [EMSHandle],dx\r
 247                 jmp     End2\r
 248 #ifdef __BORLANDC__\r
 249         }\r
 250 #endif\r
 251         error2:\r
 252 #ifdef __BORLANDC__\r
 253         __asm {\r
 254 #endif\r
 255                 mov     err,ah\r
 256                 mov     errorflag,1\r
 257                 jmp End2\r
 258 #ifdef __BORLANDC__\r
 259         }\r
 260 #endif\r
 261 End2:\r
 262 #ifdef __WATCOMC__\r
 263         }\r
 264 #endif\r
 265 \r
 266         if(errorflag==false)\r
 267         {\r
 268         gvar->mmi.EMSmem += gvar->pm.emm.EMSAvail * (long)EMSPageSize;\r
 269 \r
 270         // Initialize EMS mapping cache\r
 271         for (i = 0;i < EMSFrameCount;i++)\r
 272                 gvar->pm.emm.EMSList[i].baseEMSPage = -1;\r
 273 \r
 274         }\r
 275         else\r
 276         {\r
 277                 strcpy(str,"PML_StartupEMS: EMS error ");\r
 278                 MM_EMSerr(str, err);\r
 279                 printf("%s\n",str);\r
 280                 return(EMSPresent);\r
 281         }\r
 282 \r
 283         EMSPresent = true;                      // We have EMS\r
 284         gvar->pm.emm.EMSPageFrame = EMSPageFrame;\r
 285         gvar->pm.emm.EMSAvail = EMSAvail;\r
 286         gvar->pm.emm.EMSVer = EMSVer;\r
 287         gvar->pm.emm.EMSHandle = EMSHandle;\r
 288         gvar->pm.emm.freeEMSpages = freeEMSpages;\r
 289         gvar->pm.emm.totalEMSpages = totalEMSpages;\r
 290 \r
 291         return(EMSPresent);\r
 292 }\r
 293 \r
 294 //\r
 295 //      PML_ShutdownEMS() - If EMS was used, deallocate it\r
 296 //\r
 297 void\r
 298 PML_ShutdownEMS(global_game_variables_t *gvar)\r
 299 {\r
 300         word EMSHandle;\r
 301         byte err;\r
 302         byte    str[64];\r
 303         boolean errorflag=false;\r
 304 \r
 305         EMSHandle=gvar->pm.emm.EMSHandle;\r
 306 \r
 307         if (EMSPresent)\r
 308         {\r
 309                 __asm {\r
 310                         mov     ah,EMS_FREEPAGES\r
 311                         mov     dx,[EMSHandle]\r
 312                         int     EMS_INT\r
 313                         jc      errors\r
 314                         jmp     Ends\r
 315 #ifdef __BORLANDC__\r
 316                 }\r
 317 #endif\r
 318                         errors:\r
 319 #ifdef __BORLANDC__\r
 320                 __asm {\r
 321 #endif\r
 322                         mov     err,ah\r
 323                         mov     errorflag,1\r
 324                         jmp Ends\r
 325 #ifdef __BORLANDC__\r
 326                 }\r
 327 #endif\r
 328                 Ends:\r
 329 #ifdef __WATCOMC__\r
 330                 }\r
 331 #endif\r
 332                 if(errorflag==true)\r
 333                 {\r
 334                         strcpy(str,"PML_ShutdownEMS: Error freeing EMS ");\r
 335                         MM_EMSerr(str, err);\r
 336                         printf("%s\n",str);\r
 337                         Quit("PML_ShutdownEMS: Error freeing EMS\n");\r
 338                         //return;\r
 339                 }\r
 340         }\r
 341 }\r
 342 \r
 343 /////////////////////////////////////////////////////////////////////////////\r
 344 //\r
 345 //      XMS Management code\r
 346 //\r
 347 /////////////////////////////////////////////////////////////////////////////\r
 348 \r
 349 //\r
 350 //      PML_StartupXMS() - Starts up XMS for the Page Mgr's use\r
 351 //              Checks for presence of an XMS driver\r
 352 //              Makes sure that there's at least a page of XMS available\r
 353 //              Allocates any remaining XMS (rounded down to the nearest page size)\r
 354 //\r
 355 boolean\r
 356 PML_StartupXMS(global_game_variables_t *gvar)\r
 357 {\r
 358         XMSPresent = false;                                     // Assume failure\r
 359         gvar->pm.xmm.XMSAvail = 0;\r
 360 \r
 361         _AX=0x4300;\r
 362         geninterrupt(XMS_INT);                                  // Check for presence of XMS driver\r
 363         if (_AL != 0x80)\r
 364                 goto error;\r
 365 \r
 366 \r
 367         __asm {\r
 368                 mov     ax,0x4310\r
 369                 int     XMS_INT                                                 // Get address of XMS driver\r
 370                 mov     [WORD PTR XMSDriver],bx\r
 371                 mov     [WORD PTR XMSDriver+2],es               // function pointer to XMS driver\r
 372         }\r
 373 \r
 374         XMS_CALL(XMS_QUERYFREE);                        // Find out how much XMS is available\r
 375         gvar->pm.xmm.XMSAvail = _AX;\r
 376         if (!_AX)                               // AJR: bugfix 10/8/92\r
 377                 goto error;\r
 378 \r
 379         gvar->pm.xmm.XMSAvail &= ~(PMPageSizeKB - 1);   // Round off to nearest page size\r
 380         if (gvar->pm.xmm.XMSAvail < (PMPageSizeKB * 2)) // Need at least 2 pages\r
 381                 goto error;\r
 382 \r
 383         _DX = gvar->pm.xmm.XMSAvail;\r
 384         XMS_CALL(XMS_ALLOC);                            // And do the allocation\r
 385         gvar->pm.xmm.XMSHandle = _DX;\r
 386 \r
 387         if (!_AX)                               // AJR: bugfix 10/8/92\r
 388         {\r
 389                 gvar->pm.xmm.XMSAvail = 0;\r
 390                 goto error;\r
 391         }\r
 392 \r
 393         gvar->mmi.XMSmem += gvar->pm.xmm.XMSAvail * 1024;\r
 394 \r
 395         XMSPresent = true;\r
 396 error:\r
 397         return(XMSPresent);\r
 398 }\r
 399 \r
 400 //\r
 401 //      PML_XMSCopy() - Copies a main/EMS page to or from XMS\r
 402 //              Will round an odd-length request up to the next even value\r
 403 //\r
 404 void\r
 405 PML_XMSCopy(boolean toxms,byte far *addr,word xmspage,word length, global_game_variables_t *gvar)\r
 406 {\r
 407         dword   xoffset;\r
 408         struct\r
 409         {\r
 410                 dword   length;\r
 411                 word            source_handle;\r
 412                 dword   source_offset;\r
 413                 word            target_handle;\r
 414                 dword   target_offset;\r
 415         } copy;\r
 416 \r
 417         if (!addr)\r
 418         {\r
 419                 Quit("PML_XMSCopy: zero address\n");\r
 420                 //return;\r
 421         }\r
 422 \r
 423         xoffset = (dword)xmspage * PMPageSize;\r
 424 \r
 425         copy.length = (length + 1) & ~1;\r
 426         copy.source_handle = toxms? 0 : gvar->pm.xmm.XMSHandle;\r
 427         copy.source_offset = toxms? (long)addr : xoffset;\r
 428         copy.target_handle = toxms? gvar->pm.xmm.XMSHandle : 0;\r
 429         copy.target_offset = toxms? xoffset : (long)addr;\r
 430 \r
 431         __asm {\r
 432                 push si\r
 433         }\r
 434         _SI = (word)&copy;\r
 435         XMS_CALL(XMS_MOVE);\r
 436         __asm {\r
 437                 pop     si\r
 438         }\r
 439         if (!_AX)\r
 440         {\r
 441                 Quit("PML_XMSCopy: Error on copy");\r
 442                 //return;\r
 443         }\r
 444 }\r
 445 \r
 446 #if 1\r
 447 #define PML_CopyToXMS(s,t,l,gvar)       PML_XMSCopy(true,(s),(t),(l),(gvar))\r
 448 #define PML_CopyFromXMS(t,s,l,gvar)     PML_XMSCopy(false,(t),(s),(l),(gvar))\r
 449 #else\r
 450 //\r
 451 //      PML_CopyToXMS() - Copies the specified number of bytes from the real mode\r
 452 //              segment address to the specified XMS page\r
 453 //\r
 454 void\r
 455 PML_CopyToXMS(byte far *source,int targetpage,word length,global_game_variables_t *gvar)\r
 456 {\r
 457         PML_XMSCopy(true,source,targetpage,length, global_game_variables_t *gvar);\r
 458 }\r
 459 \r
 460 //\r
 461 //      PML_CopyFromXMS() - Copies the specified number of bytes from an XMS\r
 462 //              page to the specified real mode address\r
 463 //\r
 464 void\r
 465 PML_CopyFromXMS(byte far *target,int sourcepage,word length, global_game_variables_t *gvar)\r
 466 {\r
 467         PML_XMSCopy(false,target,sourcepage,length, global_game_variables_t *gvar);\r
 468 }\r
 469 #endif\r
 470 \r
 471 //\r
 472 //      PML_ShutdownXMS()\r
 473 //\r
 474 void\r
 475 PML_ShutdownXMS(global_game_variables_t *gvar)\r
 476 {\r
 477         if (XMSPresent)\r
 478         {\r
 479                 _DX = gvar->pm.xmm.XMSHandle;\r
 480                 XMS_CALL(XMS_FREE);\r
 481                 if (_BL)\r
 482                 {\r
 483                         Quit("PML_ShutdownXMS: Error freeing XMS");\r
 484                         //return;\r
 485                 }\r
 486         }\r
 487 }\r
 488 \r
 489 /////////////////////////////////////////////////////////////////////////////\r
 490 //\r
 491 //      Main memory code\r
 492 //\r
 493 /////////////////////////////////////////////////////////////////////////////\r
 494 \r
 495 //\r
 496 //      PM_SetMainMemPurge() - Sets the purge level for all allocated main memory\r
 497 //              blocks. This shouldn't be called directly - the PM_LockMainMem() and\r
 498 //              PM_UnlockMainMem() macros should be used instead.\r
 499 //\r
 500 void\r
 501 PM_SetMainMemPurge(int level, global_game_variables_t *gvar)\r
 502 {\r
 503         int     i;\r
 504 \r
 505         if(MainPresent)\r
 506         for (i = 0;i < PMMaxMainMem;i++)\r
 507         {\r
 508 #ifdef __DEBUG_PM__\r
 509                 printf("PM_SetMainMemPurge()    info of gvar->pm.mm.MainMemPages[i]\n");\r
 510                 printf("&       %Fp,    %Fp\n", &gvar->pm.mm.MainMemPages[i],   &(gvar->pm.mm.MainMemPages[i]));\r
 511 #endif\r
 512                 if (gvar->pm.mm.MainMemPages[i])\r
 513                         MM_SetPurge(&(gvar->pm.mm.MainMemPages[i]),level, gvar);\r
 514         }\r
 515 \r
 516         else\r
 517         {\r
 518                 Quit("MainPresent IS NULL\n");\r
 519         }\r
 520 }\r
 521 \r
 522 //\r
 523 //      PM_CheckMainMem() - If something besides the Page Mgr makes requests of\r
 524 //              the Memory Mgr, some of the Page Mgr's blocks may have been purged,\r
 525 //              so this function runs through the block list and checks to see if\r
 526 //              any of the blocks have been purged. If so, it marks the corresponding\r
 527 //              page as purged & unlocked, then goes through the block list and\r
 528 //              tries to reallocate any blocks that have been purged.\r
 529 //      This routine now calls PM_LockMainMem() to make sure that any allocation\r
 530 //              attempts made during the block reallocation sweep don't purge any\r
 531 //              of the other blocks. Because PM_LockMainMem() is called,\r
 532 //              PM_UnlockMainMem() needs to be called before any other part of the\r
 533 //              program makes allocation requests of the Memory Mgr.\r
 534 //\r
 535 void\r
 536 PM_CheckMainMem(global_game_variables_t *gvar)\r
 537 {\r
 538         boolean                 allocfailed;\r
 539         int                             i,n;\r
 540         memptr                  *p;\r
 541         PMBlockAttr             *used;\r
 542         PageListStruct  far *page;\r
 543 \r
 544         if (!MainPresent)\r
 545                 return;\r
 546 \r
 547         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 548         {\r
 549                 n = page->mainPage;\r
 550                 if (n != -1)                                            // Is the page using main memory?\r
 551                 {\r
 552                         if (!gvar->pm.mm.MainMemPages[n])                       // Yep, was the block purged?\r
 553                         {\r
 554                                 page->mainPage = -1;            // Yes, mark page as purged & unlocked\r
 555                                 page->locked = pml_Unlocked;\r
 556                         }\r
 557                 }\r
 558         }\r
 559 \r
 560         // Prevent allocation attempts from purging any of our other blocks\r
 561         PM_LockMainMem(gvar);\r
 562         allocfailed = false;\r
 563         for (i = 0,p = gvar->pm.mm.MainMemPages,used = gvar->pm.mm.MainMemUsed; i < PMMaxMainMem;i++,p++,used++)\r
 564         {\r
 565                 if (!*p)                                                        // If the page got purged\r
 566                 {\r
 567                         if (*used & pmba_Allocated)             // If it was allocated\r
 568                         {\r
 569                                 *used &= ~pmba_Allocated;       // Mark as unallocated\r
 570                                 gvar->pm.mm.MainPagesAvail--;                   // and decrease available count\r
 571                         }\r
 572 \r
 573                         if (*used & pmba_Used)                  // If it was used\r
 574                         {\r
 575                                 *used &= ~pmba_Used;            // Mark as unused\r
 576                                 gvar->pm.MainPagesUsed--;                       // and decrease used count\r
 577                         }\r
 578 \r
 579                         if (!allocfailed)\r
 580                         {\r
 581                                 MM_BombOnError(false, gvar);\r
 582                                 MM_GetPtr(p,PMPageSize, gvar);          // Try to reallocate\r
 583                                 if (gvar->mm.mmerror)                                   // If it failed,\r
 584                                         allocfailed = true;                     //  don't try any more allocations\r
 585                                 else                                                    // If it worked,\r
 586                                 {\r
 587                                         *used |= pmba_Allocated;        // Mark as allocated\r
 588                                         gvar->pm.mm.MainPagesAvail++;                   // and increase available count\r
 589                                 }\r
 590                                 MM_BombOnError(true, gvar);\r
 591                         }\r
 592                 }\r
 593         }\r
 594         if (gvar->mm.mmerror)\r
 595                 gvar->mm.mmerror = false;\r
 596 }\r
 597 \r
 598 //\r
 599 //      PML_StartupMainMem() - Allocates as much main memory as is possible for\r
 600 //              the Page Mgr. The memory is allocated as non-purgeable, so if it's\r
 601 //              necessary to make requests of the Memory Mgr, PM_UnlockMainMem()\r
 602 //              needs to be called.\r
 603 //\r
 604 void\r
 605 PML_StartupMainMem(global_game_variables_t *gvar)\r
 606 {\r
 607         int             i,n;\r
 608         memptr  *p;\r
 609 \r
 610         gvar->pm.mm.MainPagesAvail = 0;\r
 611         MainPresent = false;\r
 612         MM_BombOnError(false, gvar);\r
 613         printf("PML_StartupMainMem()\n");\r
 614         printf("        p=%04x  MainMemPages=%04x\n", p, gvar->pm.mm.MainMemPages);\r
 615         printf("        p=%Fp   MainMemPages=%Fp\n", p, gvar->pm.mm.MainMemPages);\r
 616         for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)\r
 617         {\r
 618                 MM_GetPtr(p,PMPageSize, gvar);\r
 619                 if (gvar->mm.mmerror)\r
 620                         break;\r
 621 \r
 622                 gvar->pm.mm.MainPagesAvail++;\r
 623                 gvar->pm.mm.MainMemUsed[i] = pmba_Allocated;\r
 624         }\r
 625         MM_BombOnError(true, gvar);\r
 626         if (gvar->mm.mmerror)\r
 627                 gvar->mm.mmerror = false;\r
 628         if (gvar->pm.mm.MainPagesAvail < PMMinMainMem)\r
 629         {\r
 630                 Quit("PM_SetupMainMem: Not enough main memory");\r
 631                 //return;\r
 632         }\r
 633         MainPresent = true;\r
 634 }\r
 635 \r
 636 //\r
 637 //      PML_ShutdownMainMem() - Frees all of the main memory blocks used by the\r
 638 //              Page Mgr.\r
 639 //\r
 640 void\r
 641 PML_ShutdownMainMem(global_game_variables_t *gvar)\r
 642 {\r
 643         int             i;\r
 644         memptr  *p;\r
 645 \r
 646         // DEBUG - mark pages as unallocated & decrease page count as appropriate\r
 647         for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)\r
 648                 if (*p)\r
 649                         MM_FreePtr(p, gvar);\r
 650 }\r
 651 \r
 652 /////////////////////////////////////////////////////////////////////////////\r
 653 //\r
 654 //      File management code\r
 655 //\r
 656 /////////////////////////////////////////////////////////////////////////////\r
 657 \r
 658 //\r
 659 //      PML_ReadFromFile() - Reads some data in from the page file\r
 660 //\r
 661 void\r
 662 PML_ReadFromFile(byte far *buf,long offset,word length, global_game_variables_t *gvar)\r
 663 {\r
 664         if (!buf)\r
 665         {\r
 666                 Quit("PML_ReadFromFile: Null pointer");\r
 667                 //return;\r
 668         }\r
 669         if (!offset)\r
 670         {\r
 671                 Quit("PML_ReadFromFile: Zero offset");\r
 672                 //return;\r
 673         }\r
 674         if (lseek(gvar->pm.fi.PageFile,offset,SEEK_SET) != offset)\r
 675         {\r
 676                 Quit("PML_ReadFromFile: Seek failed");\r
 677                 //return;\r
 678         }\r
 679         if (!CA_FarRead(gvar->pm.fi.PageFile,buf,length, gvar))\r
 680         {\r
 681                 Quit("PML_ReadFromFile: Read failed");\r
 682                 //return;\r
 683         }\r
 684 }\r
 685 \r
 686 //\r
 687 //      PML_OpenPageFile() - Opens the page file and sets up the page info\r
 688 //\r
 689 void\r
 690 PML_OpenPageFile(global_game_variables_t *gvar)\r
 691 {\r
 692         int                             i;\r
 693         long                    size;\r
 694                                 //__SEGA buf;\r
 695         memptr          buf;\r
 696         dword           far *offsetptr;\r
 697         word                    far *lengthptr;\r
 698         PageListStruct  far *page;\r
 699 \r
 700         gvar->pm.fi.PageFile = open(gvar->pm.fi.PageFileName,O_RDONLY + O_BINARY);\r
 701         if (gvar->pm.fi.PageFile == -1)\r
 702         {\r
 703                 Quit("PML_OpenPageFile: Unable to open page file");\r
 704                 //return;\r
 705         }\r
 706 \r
 707         // Read in header variables\r
 708         read(gvar->pm.fi.PageFile,&gvar->pm.fi.ChunksInFile,sizeof(gvar->pm.fi.ChunksInFile));\r
 709         read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSpriteStart,sizeof(gvar->pm.fi.PMSpriteStart));\r
 710         read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSoundStart,sizeof(gvar->pm.fi.PMSoundStart));\r
 711 \r
 712         // Allocate and clear the page list\r
 713         gvar->pm.PMNumBlocks = gvar->pm.fi.ChunksInFile;\r
 714         MM_GetPtr((memptr *)gvar->pm.PMSegPages, sizeof(PageListStruct) * (gvar->pm.PMNumBlocks), gvar);\r
 715         MM_SetLock((memptr *)gvar->pm.PMSegPages,true, gvar);\r
 716         gvar->pm.PMPages = (PageListStruct far *)gvar->pm.PMSegPages;\r
 717         _fmemset(gvar->pm.PMPages,0,sizeof(PageListStruct) * gvar->pm.PMNumBlocks);\r
 718 \r
 719         // Read in the chunk offsets\r
 720         size = sizeof(dword) * gvar->pm.fi.ChunksInFile;\r
 721         MM_GetPtr(&buf, size, gvar);\r
 722         if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))\r
 723         {\r
 724                 Quit("PML_OpenPageFile: Offset read failed");\r
 725                 //return;\r
 726         }\r
 727         offsetptr = (dword far *)buf;\r
 728         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 729                 page->offset = *offsetptr++;\r
 730         MM_FreePtr(&buf, gvar);\r
 731 \r
 732         // Read in the chunk lengths\r
 733         size = sizeof(word) * gvar->pm.fi.ChunksInFile;\r
 734         MM_GetPtr(&buf,size, gvar);\r
 735         if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))\r
 736         {\r
 737                 Quit("PML_OpenPageFile: Length read failed");\r
 738                 //return;\r
 739         }\r
 740         lengthptr = (word far *)buf;\r
 741         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 742                 page->length = *lengthptr++;\r
 743         MM_FreePtr(&buf, gvar);\r
 744 }\r
 745 \r
 746 //\r
 747 //  PML_ClosePageFile() - Closes the page file\r
 748 //\r
 749 void\r
 750 PML_ClosePageFile(global_game_variables_t *gvar)\r
 751 {\r
 752         if (gvar->pm.fi.PageFile != -1)\r
 753                 close(gvar->pm.fi.PageFile);\r
 754         if (gvar->pm.PMSegPages)\r
 755         {\r
 756                 MM_SetLock((memptr)gvar->pm.PMSegPages,false, gvar);\r
 757                 MM_FreePtr((memptr)gvar->pm.PMSegPages, gvar);\r
 758         }\r
 759 }\r
 760 \r
 761 /////////////////////////////////////////////////////////////////////////////\r
 762 //\r
 763 //      Allocation, etc., code\r
 764 //\r
 765 /////////////////////////////////////////////////////////////////////////////\r
 766 \r
 767 //\r
 768 //      PML_GetEMSAddress()\r
 769 //\r
 770 //              Page is in EMS, so figure out which EMS physical page should be used\r
 771 //              to map our page in. If normal page, use EMS physical page 3, else\r
 772 //              use the physical page specified by the lock type\r
 773 //\r
 774 #ifndef __DEBUG_2__\r
 775 #pragma argsused        // DEBUG - remove lock parameter\r
 776 memptr\r
 777 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)\r
 778 {\r
 779         int             i,emspage;\r
 780         word    emsoff,emsbase,offset;\r
 781 \r
 782         emsoff = page & (PMEMSSubPage - 1);\r
 783         emsbase = page - emsoff;\r
 784 \r
 785         emspage = -1;\r
 786         // See if this page is already mapped in\r
 787         for (i = 0;i < EMSFrameCount;i++)\r
 788         {\r
 789                 if (gvar->pm.emm.EMSList[i].baseEMSPage == emsbase)\r
 790                 {\r
 791                         emspage = i;    // Yep - don't do a redundant remapping\r
 792                         break;\r
 793                 }\r
 794         }\r
 795 \r
 796         // If page isn't already mapped in, find LRU EMS frame, and use it\r
 797         if (emspage == -1)\r
 798         {\r
 799                 dword last = LONG_MAX;\r
 800                 for (i = 0;i < EMSFrameCount;i++)\r
 801                 {\r
 802                         if (gvar->pm.emm.EMSList[i].lastHit < last)\r
 803                         {\r
 804                                 emspage = i;\r
 805                                 last = gvar->pm.emm.EMSList[i].lastHit;\r
 806                         }\r
 807                 }\r
 808 \r
 809                 gvar->pm.emm.EMSList[emspage].baseEMSPage = emsbase;\r
 810                 PML_MapEMS(page / PMEMSSubPage,emspage, gvar);\r
 811         }\r
 812 \r
 813         if (emspage == -1)\r
 814                 Quit("PML_GetEMSAddress: EMS find failed");\r
 815 \r
 816         gvar->pm.emm.EMSList[emspage].lastHit = gvar->pm.PMFrameCount;\r
 817         offset = emspage * EMSPageSizeSeg;\r
 818         offset += emsoff * PMPageSizeSeg;\r
 819         return((memptr)(gvar->pm.emm.EMSPageFrame + offset));\r
 820 }\r
 821 #else\r
 822 memptr\r
 823 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)\r
 824 {\r
 825         word    emspage;\r
 826 \r
 827         emspage = (lock < pml_EMSLock)? 3 : (lock - pml_EMSLock);\r
 828 \r
 829         PML_MapEMS(page / PMEMSSubPage,emspage);\r
 830 \r
 831         return((memptr)(EMSPageFrame + (emspage * EMSPageSizeSeg)\r
 832                         + ((page & (PMEMSSubPage - 1)) * PMPageSizeSeg)));\r
 833 }\r
 834 #endif\r
 835 \r
 836 //\r
 837 //      PM_GetPageAddress() - Returns the address of a given page\r
 838 //              Maps in EMS if necessary\r
 839 //              Returns nil if block isn't cached into Main Memory or EMS\r
 840 //\r
 841 //\r
 842 memptr\r
 843 PM_GetPageAddress(int pagenum, global_game_variables_t *gvar)\r
 844 {\r
 845         PageListStruct  far *page;\r
 846 \r
 847         page = &gvar->pm.PMPages[pagenum];\r
 848         if (page->mainPage != -1)\r
 849                 return(gvar->pm.mm.MainMemPages[page->mainPage]);\r
 850         else if (page->emsPage != -1)\r
 851                 return(PML_GetEMSAddress(page->emsPage,page->locked, gvar));\r
 852         else\r
 853                 return(nil);\r
 854 }\r
 855 \r
 856 //\r
 857 //      PML_GiveLRUPage() - Returns the page # of the least recently used\r
 858 //              present & unlocked main/EMS page (or main page if mainonly is true)\r
 859 //\r
 860 int\r
 861 PML_GiveLRUPage(boolean mainonly, global_game_variables_t *gvar)\r
 862 {\r
 863         int                             i,lru;\r
 864         long                    last;\r
 865         PageListStruct  far *page;\r
 866 \r
 867         for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 868         {\r
 869                 if\r
 870                 (\r
 871                         (page->lastHit < last)\r
 872                 &&      ((page->emsPage != -1) || (page->mainPage != -1))\r
 873                 &&      (page->locked == pml_Unlocked)\r
 874                 &&      (!(mainonly && (page->mainPage == -1)))\r
 875                 )\r
 876                 {\r
 877                         last = page->lastHit;\r
 878                         lru = i;\r
 879                 }\r
 880         }\r
 881 \r
 882         if (lru == -1)\r
 883                 Quit("PML_GiveLRUPage: LRU Search failed");\r
 884         return(lru);\r
 885 }\r
 886 \r
 887 //\r
 888 //      PML_GiveLRUXMSPage() - Returns the page # of the least recently used\r
 889 //              (and present) XMS page.\r
 890 //      This routine won't return the XMS page protected (by XMSProtectPage)\r
 891 //\r
 892 int\r
 893 PML_GiveLRUXMSPage(global_game_variables_t *gvar)\r
 894 {\r
 895         int                             i,lru;\r
 896         long                    last;\r
 897         PageListStruct  far *page;\r
 898 \r
 899         for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 900         {\r
 901                 if\r
 902                 (\r
 903                         (page->xmsPage != -1)\r
 904                 &&      (page->lastHit < last)\r
 905                 &&      (i != gvar->pm.xmm.XMSProtectPage)\r
 906                 )\r
 907                 {\r
 908                         last = page->lastHit;\r
 909                         lru = i;\r
 910                 }\r
 911         }\r
 912         return(lru);\r
 913 }\r
 914 \r
 915 //\r
 916 //      PML_PutPageInXMS() - If page isn't in XMS, find LRU XMS page and replace\r
 917 //              it with the main/EMS page\r
 918 //\r
 919 void\r
 920 PML_PutPageInXMS(int pagenum, global_game_variables_t *gvar)\r
 921 {\r
 922         int                             usexms;\r
 923         PageListStruct  far *page;\r
 924 \r
 925         if (!XMSPresent)\r
 926                 return;\r
 927 \r
 928         page = &gvar->pm.PMPages[pagenum];\r
 929         if (page->xmsPage != -1)\r
 930                 return;                                 // Already in XMS\r
 931 \r
 932         if (gvar->pm.XMSPagesUsed < gvar->pm.xmm.XMSPagesAvail)\r
 933                 page->xmsPage = gvar->pm.XMSPagesUsed++;\r
 934         else\r
 935         {\r
 936                 usexms = PML_GiveLRUXMSPage(gvar);\r
 937                 if (usexms == -1)\r
 938                         Quit("PML_PutPageInXMS: No XMS LRU");\r
 939                 page->xmsPage = gvar->pm.PMPages[usexms].xmsPage;\r
 940                 gvar->pm.PMPages[usexms].xmsPage = -1;\r
 941         }\r
 942         PML_CopyToXMS(PM_GetPageAddress(pagenum, gvar),page->xmsPage,page->length, gvar);\r
 943 }\r
 944 \r
 945 //\r
 946 //      PML_TransferPageSpace() - A page is being replaced, so give the new page\r
 947 //              the old one's address space. Returns the address of the new page.\r
 948 //\r
 949 memptr\r
 950 PML_TransferPageSpace(int orig,int new, global_game_variables_t *gvar)\r
 951 {\r
 952         memptr                  addr;\r
 953         PageListStruct  far *origpage,far *newpage;\r
 954 \r
 955         if (orig == new)\r
 956                 Quit("PML_TransferPageSpace: Identity replacement");\r
 957 \r
 958         origpage = &gvar->pm.PMPages[orig];\r
 959         newpage = &gvar->pm.PMPages[new];\r
 960 \r
 961         if (origpage->locked != pml_Unlocked)\r
 962                 Quit("PML_TransferPageSpace: Killing locked page");\r
 963 \r
 964         if ((origpage->emsPage == -1) && (origpage->mainPage == -1))\r
 965                 Quit("PML_TransferPageSpace: Reusing non-existent page");\r
 966 \r
 967         // Copy page that's about to be purged into XMS\r
 968         PML_PutPageInXMS(orig, gvar);\r
 969 \r
 970         // Get the address, and force EMS into a physical page if necessary\r
 971         addr = PM_GetPageAddress(orig, gvar);\r
 972 \r
 973         // Steal the address\r
 974         newpage->emsPage = origpage->emsPage;\r
 975         newpage->mainPage = origpage->mainPage;\r
 976 \r
 977         // Mark replaced page as purged\r
 978         origpage->mainPage = origpage->emsPage = -1;\r
 979 \r
 980         if (!addr)\r
 981                 Quit("PML_TransferPageSpace: Zero replacement");\r
 982 \r
 983         return(addr);\r
 984 }\r
 985 \r
 986 //\r
 987 //      PML_GetAPageBuffer() - A page buffer is needed. Either get it from the\r
 988 //              main/EMS free pool, or use PML_GiveLRUPage() to find which page to\r
 989 //              steal the buffer from. Returns a far pointer to the page buffer, and\r
 990 //              sets the fields inside the given page structure appropriately.\r
 991 //              If mainonly is true, free EMS will be ignored, and only main pages\r
 992 //              will be looked at by PML_GiveLRUPage().\r
 993 //\r
 994 byte far *\r
 995 PML_GetAPageBuffer(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
 996 {\r
 997         byte                    far *addr = nil;\r
 998         int                             i,n;\r
 999         PMBlockAttr             *used;\r
1000         PageListStruct  far *page;\r
1001 \r
1002         page = &gvar->pm.PMPages[pagenum];\r
1003         if ((gvar->pm.EMSPagesUsed < gvar->pm.emm.EMSPagesAvail) && !mainonly)\r
1004         {\r
1005                 // There's remaining EMS - use it\r
1006                 page->emsPage = gvar->pm.EMSPagesUsed++;\r
1007                 addr = PML_GetEMSAddress(page->emsPage,page->locked, gvar);\r
1008         }\r
1009         else if (gvar->pm.MainPagesUsed < gvar->pm.mm.MainPagesAvail)\r
1010         {\r
1011                 // There's remaining main memory - use it\r
1012                 for (i = 0,n = -1,used = gvar->pm.mm.MainMemUsed;i < PMMaxMainMem;i++,used++)\r
1013                 {\r
1014                         if ((*used & pmba_Allocated) && !(*used & pmba_Used))\r
1015                         {\r
1016                                 n = i;\r
1017                                 *used |= pmba_Used;\r
1018                                 break;\r
1019                         }\r
1020                 }\r
1021                 if (n == -1)\r
1022                         Quit("PML_GetPageBuffer: MainPagesAvail lied");\r
1023                 addr = gvar->pm.mm.MainMemPages[n];\r
1024                 if (!addr)\r
1025                         Quit("PML_GetPageBuffer: Purged main block");\r
1026                 page->mainPage = n;\r
1027                 gvar->pm.MainPagesUsed++;\r
1028         }\r
1029         else\r
1030                 addr = PML_TransferPageSpace(PML_GiveLRUPage(mainonly, gvar),pagenum, gvar);\r
1031 \r
1032         if (!addr)\r
1033                 Quit("PML_GetPageBuffer: Search failed");\r
1034         return(addr);\r
1035 }\r
1036 \r
1037 //\r
1038 //      PML_GetPageFromXMS() - If page is in XMS, find LRU main/EMS page and\r
1039 //              replace it with the page from XMS. If mainonly is true, will only\r
1040 //              search for LRU main page.\r
1041 //      XMSProtectPage is set to the page to be retrieved from XMS, so that if\r
1042 //              the page from which we're stealing the main/EMS from isn't in XMS,\r
1043 //              it won't copy over the page that we're trying to get from XMS.\r
1044 //              (pages that are being purged are copied into XMS, if possible)\r
1045 //\r
1046 memptr\r
1047 PML_GetPageFromXMS(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
1048 {\r
1049         byte                    far *checkaddr;\r
1050         memptr                  addr = nil;\r
1051         PageListStruct  far *page;\r
1052 \r
1053         page = &gvar->pm.PMPages[pagenum];\r
1054         if (XMSPresent && (page->xmsPage != -1))\r
1055         {\r
1056                 gvar->pm.xmm.XMSProtectPage = pagenum;\r
1057                 checkaddr = PML_GetAPageBuffer(pagenum,mainonly, gvar);\r
1058                 if (FP_OFF(checkaddr))\r
1059                         Quit("PML_GetPageFromXMS: Non segment pointer");\r
1060                 addr = (memptr)FP_SEG(checkaddr);\r
1061                 PML_CopyFromXMS(addr,page->xmsPage,page->length, gvar);\r
1062                 gvar->pm.xmm.XMSProtectPage = -1;\r
1063         }\r
1064 \r
1065         return(addr);\r
1066 }\r
1067 \r
1068 //\r
1069 //      PML_LoadPage() - A page is not in main/EMS memory, and it's not in XMS.\r
1070 //              Load it into either main or EMS. If mainonly is true, the page will\r
1071 //              only be loaded into main.\r
1072 //\r
1073 void\r
1074 PML_LoadPage(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
1075 {\r
1076         byte                    far *addr;\r
1077         PageListStruct  far *page;\r
1078 \r
1079         addr = PML_GetAPageBuffer(pagenum,mainonly, gvar);\r
1080         page = &gvar->pm.PMPages[pagenum];\r
1081         PML_ReadFromFile(addr,page->offset,page->length, gvar);\r
1082 }\r
1083 \r
1084 //\r
1085 //      PM_GetPage() - Returns the address of the page, loading it if necessary\r
1086 //              First, check if in Main Memory or EMS\r
1087 //              Then, check XMS\r
1088 //              If not in XMS, load into Main Memory or EMS\r
1089 //\r
1090 #pragma warn -pia\r
1091 memptr\r
1092 PM_GetPage(int pagenum, global_game_variables_t *gvar)\r
1093 {\r
1094         memptr  result;\r
1095 \r
1096         if (pagenum >= gvar->pm.fi.ChunksInFile)\r
1097                 Quit("PM_GetPage: Invalid page request");\r
1098 \r
1099 #ifdef __DEBUG_2__      // for debugging\r
1100         __asm {\r
1101                 mov     dx,STATUS_REGISTER_1\r
1102                 in      al,dx\r
1103                 mov     dx,ATR_INDEX\r
1104                 mov     al,ATR_OVERSCAN\r
1105                 out     dx,al\r
1106                 mov     al,10   // bright green\r
1107                 out     dx,al\r
1108         }\r
1109 #endif\r
1110 \r
1111         if (!(result = PM_GetPageAddress(pagenum, gvar)))\r
1112         {\r
1113                 boolean mainonly = (pagenum >= gvar->pm.fi.PMSoundStart);\r
1114 if (!gvar->pm.PMPages[pagenum].offset)  // JDC: sparse page\r
1115         Quit ("Tried to load a sparse page!");\r
1116                 if (!(result = PML_GetPageFromXMS(pagenum,mainonly, gvar)))\r
1117                 {\r
1118                         if (gvar->pm.PMPages[pagenum].lastHit ==  gvar->pm.PMFrameCount)\r
1119                                 gvar->pm.PMThrashing++;\r
1120 \r
1121                         PML_LoadPage(pagenum,mainonly, gvar);\r
1122                         result = PM_GetPageAddress(pagenum, gvar);\r
1123                 }\r
1124         }\r
1125         gvar->pm.PMPages[pagenum].lastHit =  gvar->pm.PMFrameCount;\r
1126 \r
1127 #ifdef __DEBUG_2__      // for debugging\r
1128         __asm{\r
1129                 mov     dx,STATUS_REGISTER_1\r
1130                 in      al,dx\r
1131                 mov     dx,ATR_INDEX\r
1132                 mov     al,ATR_OVERSCAN\r
1133                 out     dx,al\r
1134                 mov     al,3    // blue\r
1135                 out     dx,al\r
1136                 mov     al,0x20 // normal\r
1137                 out     dx,al\r
1138 #endif\r
1139 \r
1140         return(result);\r
1141 }\r
1142 #pragma warn +pia\r
1143 \r
1144 //\r
1145 //      PM_SetPageLock() - Sets the lock type on a given page\r
1146 //              pml_Unlocked: Normal, page can be purged\r
1147 //              pml_Locked: Cannot be purged\r
1148 //              pml_EMS?: Same as pml_Locked, but if in EMS, use the physical page\r
1149 //                                      specified when returning the address. For sound stuff.\r
1150 //\r
1151 void\r
1152 PM_SetPageLock(int pagenum,PMLockType lock, global_game_variables_t *gvar)\r
1153 {\r
1154         if (pagenum < gvar->pm.fi.PMSoundStart)\r
1155                 Quit("PM_SetPageLock: Locking/unlocking non-sound page");\r
1156 \r
1157         gvar->pm.PMPages[pagenum].locked = lock;\r
1158 }\r
1159 \r
1160 //\r
1161 //      PM_Preload() - Loads as many pages as possible into all types of memory.\r
1162 //              Calls the update function after each load, indicating the current\r
1163 //              page, and the total pages that need to be loaded (for thermometer).\r
1164 //\r
1165 void\r
1166 PM_Preload(boolean (*update)(word current,word total), global_game_variables_t *gvar)\r
1167 {\r
1168         int                             i,j,\r
1169                                         page,oogypage;\r
1170         word                    current,total,\r
1171                                         totalnonxms,totalxms,\r
1172                                         mainfree,maintotal,\r
1173                                         emsfree,emstotal,\r
1174                                         xmsfree,xmstotal;\r
1175         memptr                  addr;\r
1176         PageListStruct  far *p;\r
1177 \r
1178         mainfree = (gvar->pm.mm.MainPagesAvail - gvar->pm.MainPagesUsed) + (gvar->pm.emm.EMSPagesAvail - gvar->pm.EMSPagesUsed);\r
1179         xmsfree = (gvar->pm.xmm.XMSPagesAvail - gvar->pm.XMSPagesUsed);\r
1180 \r
1181         xmstotal = maintotal = 0;\r
1182 \r
1183         for (i = 0;i < gvar->pm.fi.ChunksInFile;i++)\r
1184         {\r
1185                 if (!gvar->pm.PMPages[i].offset)\r
1186                         continue;                       // sparse\r
1187 \r
1188                 if ( gvar->pm.PMPages[i].emsPage != -1 || gvar->pm.PMPages[i].mainPage != -1 )\r
1189                         continue;                       // already in main mem\r
1190 \r
1191                 if ( mainfree )\r
1192                 {\r
1193                         maintotal++;\r
1194                         mainfree--;\r
1195                 }\r
1196                 else if ( xmsfree && (gvar->pm.PMPages[i].xmsPage == -1) )\r
1197                 {\r
1198                         xmstotal++;\r
1199                         xmsfree--;\r
1200                 }\r
1201         }\r
1202 \r
1203 \r
1204         total = maintotal + xmstotal;\r
1205 \r
1206         if (!total)\r
1207                 return;\r
1208 \r
1209         page = 0;\r
1210         current = 0;\r
1211 \r
1212 //\r
1213 // cache main/ems blocks\r
1214 //\r
1215         while (maintotal)\r
1216         {\r
1217                 while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].mainPage != -1\r
1218                         ||      gvar->pm.PMPages[page].emsPage != -1 )\r
1219                         page++;\r
1220 \r
1221                 if (page >= gvar->pm.fi.ChunksInFile)\r
1222                         Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");\r
1223 \r
1224                 PM_GetPage(page, gvar);\r
1225 \r
1226                 page++;\r
1227                 current++;\r
1228                 maintotal--;\r
1229                 update(current,total);\r
1230         }\r
1231 \r
1232 //\r
1233 // load stuff to XMS\r
1234 //\r
1235         if (xmstotal)\r
1236         {\r
1237                 for (oogypage = 0 ; gvar->pm.PMPages[oogypage].mainPage == -1 ; oogypage++)\r
1238                 ;\r
1239                 addr = PM_GetPage(oogypage, gvar);\r
1240                 if (!addr)\r
1241                         Quit("PM_Preload: XMS buffer failed");\r
1242 \r
1243                 while (xmstotal)\r
1244                 {\r
1245                         while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].xmsPage != -1 )\r
1246                                 page++;\r
1247 \r
1248                         if (page >= gvar->pm.fi.ChunksInFile)\r
1249                                 Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");\r
1250 \r
1251                         p = &gvar->pm.PMPages[page];\r
1252 \r
1253                         p->xmsPage = gvar->pm.XMSPagesUsed++;\r
1254                         if (gvar->pm.XMSPagesUsed > gvar->pm.xmm.XMSPagesAvail)\r
1255                                 Quit("PM_Preload: Exceeded XMS pages");\r
1256                         if (p->length > PMPageSize)\r
1257                                 Quit("PM_Preload: Page too long");\r
1258 \r
1259                         PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);\r
1260                         PML_CopyToXMS((byte far *)addr,p->xmsPage,p->length, gvar);\r
1261 \r
1262                         page++;\r
1263                         current++;\r
1264                         xmstotal--;\r
1265                         update(current,total);\r
1266                 }\r
1267 \r
1268                 p = &gvar->pm.PMPages[oogypage];\r
1269                 PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);\r
1270         }\r
1271 \r
1272         update(total,total);\r
1273 }\r
1274 \r
1275 /////////////////////////////////////////////////////////////////////////////\r
1276 //\r
1277 //      General code\r
1278 //\r
1279 /////////////////////////////////////////////////////////////////////////////\r
1280 \r
1281 //\r
1282 //      PM_NextFrame() - Increments the frame counter and adjusts the thrash\r
1283 //              avoidence variables\r
1284 //\r
1285 //              If currently in panic mode (to avoid thrashing), check to see if the\r
1286 //                      appropriate number of frames have passed since the last time that\r
1287 //                      we would have thrashed. If so, take us out of panic mode.\r
1288 //\r
1289 //\r
1290 void\r
1291 PM_NextFrame(global_game_variables_t *gvar)\r
1292 {\r
1293         int     i;\r
1294 \r
1295         // Frame count overrun - kill the LRU hit entries & reset frame count\r
1296         if (++gvar->pm.PMFrameCount >= LONG_MAX - 4)\r
1297         {\r
1298                 for (i = 0;i < gvar->pm.PMNumBlocks;i++)\r
1299                         gvar->pm.PMPages[i].lastHit = 0;\r
1300                 gvar->pm.PMFrameCount = 0;\r
1301         }\r
1302 \r
1303 //#if 0\r
1304         for (i = 0;i < gvar->pm.fi.PMSoundStart;i++)\r
1305         {\r
1306                 if (gvar->pm.PMPages[i].locked)\r
1307                 {\r
1308                         char buf[40];\r
1309                         sprintf(buf,"PM_NextFrame: Page %d is locked",i);\r
1310                         Quit(buf);\r
1311                 }\r
1312         }\r
1313 //#endif\r
1314 \r
1315         if (gvar->pm.PMPanicMode)\r
1316         {\r
1317                 // DEBUG - set border color\r
1318                 if ((!gvar->pm.PMThrashing) && (!--gvar->pm.PMPanicMode))\r
1319                 {\r
1320                         // DEBUG - reset border color\r
1321                 }\r
1322         }\r
1323         if (gvar->pm.PMThrashing >= PMThrashThreshold)\r
1324                 gvar->pm.PMPanicMode = PMUnThrashThreshold;\r
1325         gvar->pm.PMThrashing = false;\r
1326 }\r
1327 \r
1328 //\r
1329 //      PM_Reset() - Sets up caching structures\r
1330 //\r
1331 void\r
1332 PM_Reset(global_game_variables_t *gvar)\r
1333 {\r
1334         int                             i;\r
1335         PageListStruct  far *page;\r
1336 \r
1337         gvar->pm.xmm.XMSPagesAvail = gvar->pm.xmm.XMSAvail / PMPageSizeKB;\r
1338 \r
1339         gvar->pm.emm.EMSPagesAvail = gvar->pm.emm.EMSAvail * (EMSPageSizeKB / PMPageSizeKB);\r
1340         gvar->pm.emm.EMSPhysicalPage = 0;\r
1341 \r
1342         gvar->pm.MainPagesUsed = gvar->pm.EMSPagesUsed = gvar->pm.XMSPagesUsed = 0;\r
1343 \r
1344         gvar->pm.PMPanicMode = false;\r
1345 \r
1346         gvar->pm.fi.PageFile = -1;\r
1347         gvar->pm.xmm.XMSProtectPage = -1;\r
1348 \r
1349         // Initialize page list\r
1350         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.PMNumBlocks;i++,page++)\r
1351         {\r
1352                 page->mainPage = -1;\r
1353                 page->emsPage = -1;\r
1354                 page->xmsPage = -1;\r
1355                 page->locked = false;\r
1356         }\r
1357 }\r
1358 \r
1359 //\r
1360 //      PM_Startup() - Start up the Page Mgr\r
1361 //\r
1362 void\r
1363 PM_Startup(global_game_variables_t *gvar)\r
1364 {\r
1365         boolean nomain,noems,noxms;\r
1366         int             i;\r
1367 \r
1368         if (PMStarted)\r
1369                 return;\r
1370 \r
1371         //strcpy(&(gvar->pm.fi.PageFileName), "VSWAP.");\r
1372 \r
1373         nomain = noems = noxms = false;\r
1374         for (i = 1;i <\r
1375 #ifdef __WATCOMC__\r
1376         __argc\r
1377 #endif\r
1378 #ifdef __BORLANDC__\r
1379         _argc\r
1380 #endif\r
1381         ;i++)\r
1382         {\r
1383                 switch (US_CheckParm(\r
1384 #ifdef __WATCOMC__\r
1385         __argv[i]\r
1386 #endif\r
1387 #ifdef __BORLANDC__\r
1388         _argv[i]\r
1389 #endif\r
1390                 ,ParmStrings))\r
1391                 {\r
1392                 case 0:\r
1393                         nomain = true;\r
1394                         break;\r
1395                 case 1:\r
1396                         noems = true;\r
1397                         break;\r
1398                 case 2:\r
1399                         noxms = true;\r
1400                         break;\r
1401                 }\r
1402         }\r
1403 \r
1404         //0000++++PML_OpenPageFile(gvar);\r
1405 \r
1406         if (!noems)\r
1407                 PML_StartupEMS(gvar);\r
1408         if (!noxms)\r
1409                 //++++PML_StartupXMS(gvar);     //TODO: convert\r
1410 \r
1411         if (!nomain && !EMSPresent)\r
1412         {\r
1413                 Quit("PM_Startup: No main or EMS\n");\r
1414                 //return;\r
1415         }\r
1416         PML_StartupMainMem(gvar);\r
1417 \r
1418         PM_Reset(gvar);\r
1419 \r
1420         PMStarted = true;\r
1421 }\r
1422 \r
1423 //\r
1424 //      PM_Shutdown() - Shut down the Page Mgr\r
1425 //\r
1426 void\r
1427 PM_Shutdown(global_game_variables_t *gvar)\r
1428 {\r
1429         PML_ShutdownXMS(gvar);\r
1430         PML_ShutdownEMS(gvar);\r
1431 \r
1432         if (!PMStarted)\r
1433                 return;\r
1434 \r
1435         PML_ClosePageFile(gvar);\r
1436 \r
1437         PML_ShutdownMainMem(gvar);\r
1438 }\r