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         gvar->pm.emm.EMSPresent = false;                        // Assume that we'll fail\r
 152         gvar->pm.emm.EMSAvail = 0;\r
 153         gvar->mmi.EMSmem = 0;\r
 154 \r
 155         __asm {\r
 156                 mov     dx,OFFSET emmname       //fix by andrius4669\r
 157                 mov     ax,0x3d00\r
 158                 int     EMS_INT         // try to open EMMXXXX0 device\r
 159                 jc      erroreu\r
 160 \r
 161                 mov     bx,ax\r
 162                 mov     ax,0x4400\r
 163 \r
 164                 int     EMS_INT         // get device info\r
 165                 jc      erroreu\r
 166 \r
 167                 and     dx,0x80\r
 168                 jz      erroreu\r
 169 \r
 170                 mov     ax,0x4407\r
 171 \r
 172                 int     EMS_INT         // get status\r
 173                 jc      erroreu\r
 174                 or      al,al\r
 175                 jz      erroreu\r
 176 \r
 177                 mov     ah,0x3e\r
 178                 int     EMS_INT         // close handle\r
 179                 jc      erroreu\r
 180 \r
 181                 mov     ah,EMS_STATUS\r
 182                 int     EMS_INT\r
 183                 jc      erroreu                 // make sure EMS hardware is present\r
 184 \r
 185                 mov     ah,EMS_VERSION\r
 186                 int     EMS_INT                 // only work on EMS 3.2 or greater (silly, but...)\r
 187                 or      ah,ah\r
 188                 jnz     erroreu\r
 189                 mov     [EMSVer],ax             //      set EMSVer\r
 190                 cmp     al,0x32                 // only work on ems 3.2 or greater\r
 191                 jb      erroreu\r
 192 \r
 193                 mov     ah,EMS_GETFRAME\r
 194                 int     EMS_INT                 // find the page frame address\r
 195                 or      ah,ah\r
 196                 jnz     erroreu\r
 197                 mov     [EMSPageFrame],bx\r
 198 \r
 199                 mov     ah,EMS_GETPAGES\r
 200                 int     EMS_INT                 // find out how much EMS is there\r
 201                 or      ah,ah\r
 202                 jnz     erroreu\r
 203                 or      bx,bx\r
 204                 jz      noEMS                   // no EMS at all to allocate\r
 205                 cmp     bx,2\r
 206                 jl      noEMS                   // Require at least 2 pages (32k)\r
 207                 mov     [totalEMSpages],dx\r
 208                 mov     [freeEMSpages],bx\r
 209                 mov     [EMSAvail],bx\r
 210                 jmp     Endeu\r
 211 #ifdef __BORLANDC__\r
 212         }\r
 213 #endif\r
 214                 erroreu:\r
 215 #ifdef __BORLANDC__\r
 216         __asm {\r
 217 #endif\r
 218                 mov     err,ah\r
 219                 mov     errorflag,1\r
 220                 jmp     Endeu\r
 221 #ifdef __BORLANDC__\r
 222         }\r
 223 #endif\r
 224                 noEMS:\r
 225                 Endeu:\r
 226 #ifdef __WATCOMC__\r
 227         }\r
 228 #endif\r
 229 /*\r
 230         if(errorflag==false)\r
 231         {\r
 232                 // Don't hog all available EMS\r
 233                 size = gvar->pm.emm.EMSAvail * (long)EMSPageSize;\r
 234                 if (size - (EMSPageSize * 2) > (gvar->pm.fi.ChunksInFile * (long)PMPageSize))\r
 235                 {\r
 236                         size = (gvar->pm.fi.ChunksInFile * (long)PMPageSize) + EMSPageSize;\r
 237                         gvar->pm.emm.EMSAvail = size / EMSPageSize;\r
 238                 }\r
 239         }\r
 240 */\r
 241         __asm {\r
 242                 mov     ah,EMS_ALLOCPAGES\r
 243                 mov     bx,[EMSAvail];\r
 244                 int     EMS_INT\r
 245                 or      ah,ah\r
 246                 jnz     erroreuu\r
 247                 mov     [EMSHandle],dx\r
 248                 jmp     Endeuu\r
 249 #ifdef __BORLANDC__\r
 250         }\r
 251 #endif\r
 252                 erroreuu:\r
 253 #ifdef __BORLANDC__\r
 254         __asm {\r
 255 #endif\r
 256                 mov     err,ah\r
 257                 mov     errorflag,1\r
 258                 jmp Endeuu\r
 259 #ifdef __BORLANDC__\r
 260         }\r
 261 #endif\r
 262                 Endeuu:\r
 263 #ifdef __WATCOMC__\r
 264         }\r
 265 #endif\r
 266 \r
 267         if(errorflag==false)\r
 268         {\r
 269         gvar->pm.emm.EMSAvail = EMSAvail;\r
 270         gvar->mmi.EMSmem = gvar->pm.emm.EMSAvail * (dword)EMSPageSize;\r
 271 \r
 272         // Initialize EMS mapping cache\r
 273         for (i = 0;i < EMSFrameCount;i++)\r
 274                 gvar->pm.emm.EMSList[i].baseEMSPage = -1;\r
 275 \r
 276         }\r
 277         else\r
 278         {\r
 279                 strcpy(str,"PML_StartupEMS: EMS error ");\r
 280                 MM_EMSerr(str, err);\r
 281                 printf("%s\n",str);\r
 282                 return(gvar->pm.emm.EMSPresent);\r
 283         }\r
 284 \r
 285         gvar->pm.emm.EMSPresent = true;                 // We have EMS\r
 286         gvar->pm.emm.EMSPageFrame = EMSPageFrame;\r
 287         gvar->pm.emm.EMSVer = EMSVer;\r
 288         gvar->pm.emm.EMSHandle = EMSHandle;\r
 289         gvar->pm.emm.freeEMSpages = freeEMSpages;\r
 290         gvar->pm.emm.totalEMSpages = totalEMSpages;\r
 291 \r
 292         return(gvar->pm.emm.EMSPresent);\r
 293 }\r
 294 \r
 295 //\r
 296 //      PML_ShutdownEMS() - If EMS was used, deallocate it\r
 297 //\r
 298 void\r
 299 PML_ShutdownEMS(global_game_variables_t *gvar)\r
 300 {\r
 301         word EMSHandle;\r
 302         byte err;\r
 303         byte    str[64];\r
 304         boolean errorflag=false;\r
 305 \r
 306         EMSHandle=gvar->pm.emm.EMSHandle;\r
 307 \r
 308         if (gvar->pm.emm.EMSPresent)\r
 309         {\r
 310                 __asm {\r
 311                         mov     ah,EMS_FREEPAGES\r
 312                         mov     dx,[EMSHandle]\r
 313                         int     EMS_INT\r
 314                         jc      errores\r
 315                         jmp     Endes\r
 316 #ifdef __BORLANDC__\r
 317                 }\r
 318 #endif\r
 319                         errores:\r
 320 #ifdef __BORLANDC__\r
 321                 __asm {\r
 322 #endif\r
 323                         mov     err,ah\r
 324                         mov     errorflag,1\r
 325                         jmp     Endes\r
 326 #ifdef __BORLANDC__\r
 327                 }\r
 328 #endif\r
 329                         Endes:\r
 330 #ifdef __WATCOMC__\r
 331                 }\r
 332 #endif\r
 333                 if(errorflag==true)\r
 334                 {\r
 335                         strcpy(str,"PML_ShutdownEMS: Error freeing EMS ");\r
 336                         MM_EMSerr(str, err);\r
 337                         printf("%s\n",str);\r
 338                         Quit("PML_ShutdownEMS: Error freeing EMS\n");\r
 339                         //return;\r
 340                 }\r
 341         }\r
 342 }\r
 343 \r
 344 /////////////////////////////////////////////////////////////////////////////\r
 345 //\r
 346 //      XMS Management code\r
 347 //\r
 348 /////////////////////////////////////////////////////////////////////////////\r
 349 \r
 350 //\r
 351 //      PML_StartupXMS() - Starts up XMS for the Page Mgr's use\r
 352 //              Checks for presence of an XMS driver\r
 353 //              Makes sure that there's at least a page of XMS available\r
 354 //              Allocates any remaining XMS (rounded down to the nearest page size)\r
 355 //\r
 356 boolean\r
 357 PML_StartupXMS(global_game_variables_t *gvar)\r
 358 {\r
 359         boolean errorflag;\r
 360         word XMSAvail, XMSHandle;\r
 361         errorflag=gvar->pm.xmm.XMSPresent = false;                                      // Assume failure\r
 362         XMSAvail = gvar->pm.xmm.XMSAvail = 0;\r
 363 \r
 364         __asm {\r
 365                 mov     ax,0x4300\r
 366                 int     XMS_INT                                         // Check for presence of XMS driver\r
 367                 cmp     al,0x80\r
 368                 jne     errorxu\r
 369 \r
 370                 mov     ax,0x4310\r
 371                 int     XMS_INT                                                 // Get address of XMS driver\r
 372                 mov     [WORD PTR XMSDriver],bx\r
 373                 mov     [WORD PTR XMSDriver+2],es               // function pointer to XMS driver\r
 374 \r
 375                 //XMS_CALL(XMS_QUERYFREE);                      // Find out how much XMS is available\r
 376                 mov     ah,XMS_QUERYFREE\r
 377                 call    [WORD PTR XMSDriver]\r
 378                 mov     [XMSAvail],ax\r
 379                 or      ax,ax                           // AJR: bugfix 10/8/92\r
 380                 jz      errorxu\r
 381                 jmp     Endxu\r
 382 #ifdef __BORLANDC__\r
 383         }\r
 384 #endif\r
 385                 errorxu:\r
 386 #ifdef __BORLANDC__\r
 387         __asm {\r
 388 #endif\r
 389                 //mov   err,ah\r
 390                 mov     errorflag,1\r
 391                 jmp     Endxu\r
 392 #ifdef __BORLANDC__\r
 393         }\r
 394 #endif\r
 395                 Endxu:\r
 396 #ifdef __WATCOMC__\r
 397         }\r
 398 #endif\r
 399         gvar->pm.xmm.XMSAvail &= ~(PMPageSizeKB - 1);   // Round off to nearest page size\r
 400         if (gvar->pm.xmm.XMSAvail < (PMPageSizeKB * 2)) // Need at least 2 pages\r
 401                 goto error;\r
 402 \r
 403         __asm {\r
 404                 mov     dx,[XMSAvail]\r
 405                 //XMS_CALL(XMS_ALLOC);                          // And do the allocation\r
 406                 mov     ah,XMS_ALLOC\r
 407                 call    [WORD PTR XMSDriver]\r
 408                 mov     [XMSHandle],dx\r
 409                 or      ax,ax                           // AJR: bugfix 10/8/92\r
 410                 jz      errorxuu\r
 411                 jmp     Endxuu\r
 412 #ifdef __BORLANDC__\r
 413                 }\r
 414 #endif\r
 415                 errorxuu:\r
 416 #ifdef __BORLANDC__\r
 417         __asm {\r
 418 #endif\r
 419                 //mov   err,ah\r
 420                 mov     [XMSAvail],0\r
 421                 mov     errorflag,1\r
 422                 jmp     Endxuu\r
 423 #ifdef __BORLANDC__\r
 424         }\r
 425 #endif\r
 426                 Endxuu:\r
 427 #ifdef __WATCOMC__\r
 428         }\r
 429 #endif\r
 430 \r
 431         if(errorflag==false)\r
 432         {\r
 433                 gvar->pm.xmm.XMSAvail = XMSAvail;\r
 434                 gvar->mmi.XMSmem += gvar->pm.xmm.XMSAvail * 1024;\r
 435                 gvar->pm.xmm.XMSHandle = XMSHandle;\r
 436 \r
 437                 gvar->pm.xmm.XMSPresent = true;\r
 438         }\r
 439 error:\r
 440         return(gvar->pm.xmm.XMSPresent);\r
 441 }\r
 442 \r
 443 //\r
 444 //      PML_XMSCopy() - Copies a main/EMS page to or from XMS\r
 445 //              Will round an odd-length request up to the next even value\r
 446 //\r
 447 void\r
 448 PML_XMSCopy(boolean toxms,byte far *addr,word xmspage,word length, global_game_variables_t *gvar)\r
 449 {\r
 450         dword   xoffset;\r
 451         struct\r
 452         {\r
 453                 dword   length;\r
 454                 word            source_handle;\r
 455                 dword   source_offset;\r
 456                 word            target_handle;\r
 457                 dword   target_offset;\r
 458         } copy;\r
 459 \r
 460         if (!addr)\r
 461         {\r
 462                 Quit("PML_XMSCopy: zero address\n");\r
 463                 //return;\r
 464         }\r
 465 \r
 466         xoffset = (dword)xmspage * PMPageSize;\r
 467 \r
 468         copy.length = (length + 1) & ~1;\r
 469         copy.source_handle = toxms? 0 : gvar->pm.xmm.XMSHandle;\r
 470         copy.source_offset = toxms? (long)addr : xoffset;\r
 471         copy.target_handle = toxms? gvar->pm.xmm.XMSHandle : 0;\r
 472         copy.target_offset = toxms? xoffset : (long)addr;\r
 473 \r
 474         __asm {\r
 475                 push si\r
 476         }\r
 477         _SI = (word)&copy;\r
 478         XMS_CALL(XMS_MOVE);\r
 479         __asm {\r
 480                 pop     si\r
 481         }\r
 482         if (!_AX)\r
 483         {\r
 484                 Quit("PML_XMSCopy: Error on copy");\r
 485                 //return;\r
 486         }\r
 487 }\r
 488 \r
 489 #if 1\r
 490 #define PML_CopyToXMS(s,t,l,gvar)       PML_XMSCopy(true,(s),(t),(l),(gvar))\r
 491 #define PML_CopyFromXMS(t,s,l,gvar)     PML_XMSCopy(false,(t),(s),(l),(gvar))\r
 492 #else\r
 493 //\r
 494 //      PML_CopyToXMS() - Copies the specified number of bytes from the real mode\r
 495 //              segment address to the specified XMS page\r
 496 //\r
 497 void\r
 498 PML_CopyToXMS(byte far *source,int targetpage,word length,global_game_variables_t *gvar)\r
 499 {\r
 500         PML_XMSCopy(true,source,targetpage,length, global_game_variables_t *gvar);\r
 501 }\r
 502 \r
 503 //\r
 504 //      PML_CopyFromXMS() - Copies the specified number of bytes from an XMS\r
 505 //              page to the specified real mode address\r
 506 //\r
 507 void\r
 508 PML_CopyFromXMS(byte far *target,int sourcepage,word length, global_game_variables_t *gvar)\r
 509 {\r
 510         PML_XMSCopy(false,target,sourcepage,length, global_game_variables_t *gvar);\r
 511 }\r
 512 #endif\r
 513 \r
 514 //\r
 515 //      PML_ShutdownXMS()\r
 516 //\r
 517 void\r
 518 PML_ShutdownXMS(global_game_variables_t *gvar)\r
 519 {\r
 520         boolean errorflag=false;\r
 521         word XMSHandle = gvar->pm.xmm.XMSHandle;\r
 522         if (gvar->pm.xmm.XMSPresent)\r
 523         {\r
 524                 __asm {\r
 525                         mov     dx,[XMSHandle]\r
 526                         //XMS_CALL(XMS_FREE);\r
 527                         mov     ah,XMS_FREE\r
 528                         call    [WORD PTR XMSDriver]\r
 529                         or      bl,bl\r
 530                         jz      errorxs\r
 531                         jmp     Endxs\r
 532 #ifdef __BORLANDC__\r
 533                 }\r
 534 #endif\r
 535                         errorxs:\r
 536 #ifdef __BORLANDC__\r
 537                 __asm {\r
 538 #endif\r
 539                         //mov   err,ah\r
 540                         mov     errorflag,1\r
 541                         jmp     Endxs\r
 542 #ifdef __BORLANDC__\r
 543                 }\r
 544 #endif\r
 545                         Endxs:\r
 546 #ifdef __WATCOMC__\r
 547                 }\r
 548 #endif\r
 549                 if(errorflag==true)\r
 550                 {\r
 551                         Quit("PML_ShutdownXMS: Error freeing XMS");\r
 552                         //return;\r
 553                 }\r
 554         }\r
 555 }\r
 556 \r
 557 /////////////////////////////////////////////////////////////////////////////\r
 558 //\r
 559 //      Main memory code\r
 560 //\r
 561 /////////////////////////////////////////////////////////////////////////////\r
 562 \r
 563 //\r
 564 //      PM_SetMainMemPurge() - Sets the purge level for all allocated main memory\r
 565 //              blocks. This shouldn't be called directly - the PM_LockMainMem() and\r
 566 //              PM_UnlockMainMem() macros should be used instead.\r
 567 //\r
 568 void\r
 569 PM_SetMainMemPurge(int level, global_game_variables_t *gvar)\r
 570 {\r
 571         int     i;\r
 572 \r
 573         if(gvar->pm.mm.MainPresent)\r
 574         for (i = 0;i < PMMaxMainMem;i++)\r
 575         {\r
 576 #ifdef __DEBUG_PM__\r
 577                 printf("PM_SetMainMemPurge()    info of gvar->pm.mm.MainMemPages[i]\n");\r
 578                 printf("&       %Fp,    %Fp\n", &gvar->pm.mm.MainMemPages[i],   &(gvar->pm.mm.MainMemPages[i]));\r
 579 #endif\r
 580                 if (gvar->pm.mm.MainMemPages[i])\r
 581                         MM_SetPurge(&(gvar->pm.mm.MainMemPages[i]),level, gvar);\r
 582         }\r
 583 \r
 584         else\r
 585         {\r
 586                 Quit("MainPresent IS NULL\n");\r
 587         }\r
 588 }\r
 589 \r
 590 //\r
 591 //      PM_CheckMainMem() - If something besides the Page Mgr makes requests of\r
 592 //              the Memory Mgr, some of the Page Mgr's blocks may have been purged,\r
 593 //              so this function runs through the block list and checks to see if\r
 594 //              any of the blocks have been purged. If so, it marks the corresponding\r
 595 //              page as purged & unlocked, then goes through the block list and\r
 596 //              tries to reallocate any blocks that have been purged.\r
 597 //      This routine now calls PM_LockMainMem() to make sure that any allocation\r
 598 //              attempts made during the block reallocation sweep don't purge any\r
 599 //              of the other blocks. Because PM_LockMainMem() is called,\r
 600 //              PM_UnlockMainMem() needs to be called before any other part of the\r
 601 //              program makes allocation requests of the Memory Mgr.\r
 602 //\r
 603 void\r
 604 PM_CheckMainMem(global_game_variables_t *gvar)\r
 605 {\r
 606         boolean                 allocfailed;\r
 607         int                             i,n;\r
 608         memptr                  *p;\r
 609         PMBlockAttr             *used;\r
 610         PageListStruct  far *page;\r
 611 \r
 612         if (!gvar->pm.mm.MainPresent)\r
 613                 return;\r
 614 \r
 615         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 616         {\r
 617                 n = page->mainPage;\r
 618                 if (n != -1)                                            // Is the page using main memory?\r
 619                 {\r
 620                         if (!gvar->pm.mm.MainMemPages[n])                       // Yep, was the block purged?\r
 621                         {\r
 622                                 page->mainPage = -1;            // Yes, mark page as purged & unlocked\r
 623                                 page->locked = pml_Unlocked;\r
 624                         }\r
 625                 }\r
 626         }\r
 627 \r
 628         // Prevent allocation attempts from purging any of our other blocks\r
 629         PM_LockMainMem(gvar);\r
 630         allocfailed = false;\r
 631         for (i = 0,p = gvar->pm.mm.MainMemPages,used = gvar->pm.mm.MainMemUsed; i < PMMaxMainMem;i++,p++,used++)\r
 632         {\r
 633                 if (!*p)                                                        // If the page got purged\r
 634                 {\r
 635                         if (*used & pmba_Allocated)             // If it was allocated\r
 636                         {\r
 637                                 *used &= ~pmba_Allocated;       // Mark as unallocated\r
 638                                 gvar->pm.mm.MainPagesAvail--;                   // and decrease available count\r
 639                         }\r
 640 \r
 641                         if (*used & pmba_Used)                  // If it was used\r
 642                         {\r
 643                                 *used &= ~pmba_Used;            // Mark as unused\r
 644                                 gvar->pm.MainPagesUsed--;                       // and decrease used count\r
 645                         }\r
 646 \r
 647                         if (!allocfailed)\r
 648                         {\r
 649                                 MM_BombOnError(false, gvar);\r
 650                                 MM_GetPtr(p,PMPageSize, gvar);          // Try to reallocate\r
 651                                 if (gvar->mm.mmerror)                                   // If it failed,\r
 652                                         allocfailed = true;                     //  don't try any more allocations\r
 653                                 else                                                    // If it worked,\r
 654                                 {\r
 655                                         *used |= pmba_Allocated;        // Mark as allocated\r
 656                                         gvar->pm.mm.MainPagesAvail++;                   // and increase available count\r
 657                                 }\r
 658                                 MM_BombOnError(true, gvar);\r
 659                         }\r
 660                 }\r
 661         }\r
 662         if (gvar->mm.mmerror)\r
 663                 gvar->mm.mmerror = false;\r
 664 }\r
 665 \r
 666 //\r
 667 //      PML_StartupMainMem() - Allocates as much main memory as is possible for\r
 668 //              the Page Mgr. The memory is allocated as non-purgeable, so if it's\r
 669 //              necessary to make requests of the Memory Mgr, PM_UnlockMainMem()\r
 670 //              needs to be called.\r
 671 //\r
 672 void\r
 673 PML_StartupMainMem(global_game_variables_t *gvar)\r
 674 {\r
 675         int             i,n;\r
 676         memptr  *p;\r
 677 \r
 678         gvar->pm.mm.MainPagesAvail = 0;\r
 679         gvar->pm.mm.MainPresent = false;\r
 680         MM_BombOnError(false, gvar);\r
 681         for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)\r
 682         {\r
 683                 MM_GetPtr(p,PMPageSize, gvar);\r
 684                 if (gvar->mm.mmerror)\r
 685                         break;\r
 686 \r
 687                 gvar->pm.mm.MainPagesAvail++;\r
 688                 gvar->pm.mm.MainMemUsed[i] = pmba_Allocated;\r
 689         }\r
 690         MM_BombOnError(true, gvar);\r
 691         if (gvar->mm.mmerror)\r
 692                 gvar->mm.mmerror = false;\r
 693         if (gvar->pm.mm.MainPagesAvail < PMMinMainMem)\r
 694         {\r
 695                 Quit("PM_SetupMainMem: Not enough main memory");\r
 696                 //return;\r
 697         }\r
 698         gvar->pm.mm.MainPresent = true;\r
 699 }\r
 700 \r
 701 //\r
 702 //      PML_ShutdownMainMem() - Frees all of the main memory blocks used by the\r
 703 //              Page Mgr.\r
 704 //\r
 705 void\r
 706 PML_ShutdownMainMem(global_game_variables_t *gvar)\r
 707 {\r
 708         int             i;\r
 709         memptr  *p;\r
 710 \r
 711         // DEBUG - mark pages as unallocated & decrease page count as appropriate\r
 712         for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)\r
 713                 if (*p)\r
 714                         MM_FreePtr(p, gvar);\r
 715 }\r
 716 \r
 717 /////////////////////////////////////////////////////////////////////////////\r
 718 //\r
 719 //      File management code\r
 720 //\r
 721 /////////////////////////////////////////////////////////////////////////////\r
 722 \r
 723 //\r
 724 //      PML_ReadFromFile() - Reads some data in from the page file\r
 725 //\r
 726 void\r
 727 PML_ReadFromFile(byte far *buf,long offset,word length, global_game_variables_t *gvar)\r
 728 {\r
 729         if (!buf)\r
 730         {\r
 731                 Quit("PML_ReadFromFile: Null pointer");\r
 732                 //return;\r
 733         }\r
 734         if (!offset)\r
 735         {\r
 736                 Quit("PML_ReadFromFile: Zero offset");\r
 737                 //return;\r
 738         }\r
 739         if (lseek(gvar->pm.fi.PageFile,offset,SEEK_SET) != offset)\r
 740         {\r
 741                 Quit("PML_ReadFromFile: Seek failed");\r
 742                 //return;\r
 743         }\r
 744         if (!CA_FarRead(gvar->pm.fi.PageFile,buf,length, gvar))\r
 745         {\r
 746                 Quit("PML_ReadFromFile: Read failed");\r
 747                 //return;\r
 748         }\r
 749 }\r
 750 \r
 751 //\r
 752 //      PML_OpenPageFile() - Opens the page file and sets up the page info\r
 753 //\r
 754 void\r
 755 PML_OpenPageFile(global_game_variables_t *gvar)\r
 756 {\r
 757         int                             i;\r
 758         long                    size;\r
 759                                 //__SEGA buf;\r
 760         memptr          buf;\r
 761         dword           far *offsetptr;\r
 762         word                    far *lengthptr;\r
 763         PageListStruct  far *page;\r
 764 \r
 765         gvar->pm.fi.PageFile = open(gvar->pm.fi.PageFileName,O_RDONLY + O_BINARY);\r
 766         if (gvar->pm.fi.PageFile == -1)\r
 767         {\r
 768                 Quit("PML_OpenPageFile: Unable to open page file");\r
 769                 //return;\r
 770         }\r
 771 \r
 772         // Read in header variables\r
 773         read(gvar->pm.fi.PageFile,&gvar->pm.fi.ChunksInFile,sizeof(gvar->pm.fi.ChunksInFile));\r
 774         read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSpriteStart,sizeof(gvar->pm.fi.PMSpriteStart));\r
 775         read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSoundStart,sizeof(gvar->pm.fi.PMSoundStart));\r
 776 \r
 777         // Allocate and clear the page list\r
 778         gvar->pm.PMNumBlocks = gvar->pm.fi.ChunksInFile;\r
 779         MM_GetPtr((memptr *)gvar->pm.PMSegPages, sizeof(PageListStruct) * (gvar->pm.PMNumBlocks), gvar);\r
 780         MM_SetLock((memptr *)gvar->pm.PMSegPages,true, gvar);\r
 781         gvar->pm.PMPages = (PageListStruct far *)gvar->pm.PMSegPages;\r
 782         _fmemset(gvar->pm.PMPages,0,sizeof(PageListStruct) * gvar->pm.PMNumBlocks);\r
 783 \r
 784         // Read in the chunk offsets\r
 785         size = sizeof(dword) * gvar->pm.fi.ChunksInFile;\r
 786         MM_GetPtr(&buf, size, gvar);\r
 787         if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))\r
 788         {\r
 789                 Quit("PML_OpenPageFile: Offset read failed");\r
 790                 //return;\r
 791         }\r
 792         offsetptr = (dword far *)buf;\r
 793         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 794                 page->offset = *offsetptr++;\r
 795         MM_FreePtr(&buf, gvar);\r
 796 \r
 797         // Read in the chunk lengths\r
 798         size = sizeof(word) * gvar->pm.fi.ChunksInFile;\r
 799         MM_GetPtr(&buf,size, gvar);\r
 800         if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))\r
 801         {\r
 802                 Quit("PML_OpenPageFile: Length read failed");\r
 803                 //return;\r
 804         }\r
 805         lengthptr = (word far *)buf;\r
 806         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 807                 page->length = *lengthptr++;\r
 808         MM_FreePtr(&buf, gvar);\r
 809 }\r
 810 \r
 811 //\r
 812 //  PML_ClosePageFile() - Closes the page file\r
 813 //\r
 814 void\r
 815 PML_ClosePageFile(global_game_variables_t *gvar)\r
 816 {\r
 817         if (gvar->pm.fi.PageFile != -1)\r
 818                 close(gvar->pm.fi.PageFile);\r
 819         if (gvar->pm.PMSegPages)\r
 820         {\r
 821                 MM_SetLock((memptr)gvar->pm.PMSegPages,false, gvar);\r
 822                 MM_FreePtr((memptr)gvar->pm.PMSegPages, gvar);\r
 823         }\r
 824 }\r
 825 \r
 826 /////////////////////////////////////////////////////////////////////////////\r
 827 //\r
 828 //      Allocation, etc., code\r
 829 //\r
 830 /////////////////////////////////////////////////////////////////////////////\r
 831 \r
 832 //\r
 833 //      PML_GetEMSAddress()\r
 834 //\r
 835 //              Page is in EMS, so figure out which EMS physical page should be used\r
 836 //              to map our page in. If normal page, use EMS physical page 3, else\r
 837 //              use the physical page specified by the lock type\r
 838 //\r
 839 #ifndef __DEBUG_2__\r
 840 #pragma argsused        // DEBUG - remove lock parameter\r
 841 memptr\r
 842 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)\r
 843 {\r
 844         int             i,emspage;\r
 845         word    emsoff,emsbase,offset;\r
 846 \r
 847         emsoff = page & (PMEMSSubPage - 1);\r
 848         emsbase = page - emsoff;\r
 849 \r
 850         emspage = -1;\r
 851         // See if this page is already mapped in\r
 852         for (i = 0;i < EMSFrameCount;i++)\r
 853         {\r
 854                 if (gvar->pm.emm.EMSList[i].baseEMSPage == emsbase)\r
 855                 {\r
 856                         emspage = i;    // Yep - don't do a redundant remapping\r
 857                         break;\r
 858                 }\r
 859         }\r
 860 \r
 861         // If page isn't already mapped in, find LRU EMS frame, and use it\r
 862         if (emspage == -1)\r
 863         {\r
 864                 dword last = LONG_MAX;\r
 865                 for (i = 0;i < EMSFrameCount;i++)\r
 866                 {\r
 867                         if (gvar->pm.emm.EMSList[i].lastHit < last)\r
 868                         {\r
 869                                 emspage = i;\r
 870                                 last = gvar->pm.emm.EMSList[i].lastHit;\r
 871                         }\r
 872                 }\r
 873 \r
 874                 gvar->pm.emm.EMSList[emspage].baseEMSPage = emsbase;\r
 875                 PML_MapEMS(page / PMEMSSubPage,emspage, gvar);\r
 876         }\r
 877 \r
 878         if (emspage == -1)\r
 879                 Quit("PML_GetEMSAddress: EMS find failed");\r
 880 \r
 881         gvar->pm.emm.EMSList[emspage].lastHit = gvar->pm.PMFrameCount;\r
 882         offset = emspage * EMSPageSizeSeg;\r
 883         offset += emsoff * PMPageSizeSeg;\r
 884         return((memptr)(gvar->pm.emm.EMSPageFrame + offset));\r
 885 }\r
 886 #else\r
 887 memptr\r
 888 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)\r
 889 {\r
 890         word    emspage;\r
 891 \r
 892         emspage = (lock < pml_EMSLock)? 3 : (lock - pml_EMSLock);\r
 893 \r
 894         PML_MapEMS(page / PMEMSSubPage,emspage);\r
 895 \r
 896         return((memptr)(EMSPageFrame + (emspage * EMSPageSizeSeg)\r
 897                         + ((page & (PMEMSSubPage - 1)) * PMPageSizeSeg)));\r
 898 }\r
 899 #endif\r
 900 \r
 901 //\r
 902 //      PM_GetPageAddress() - Returns the address of a given page\r
 903 //              Maps in EMS if necessary\r
 904 //              Returns nil if block isn't cached into Main Memory or EMS\r
 905 //\r
 906 //\r
 907 memptr\r
 908 PM_GetPageAddress(int pagenum, global_game_variables_t *gvar)\r
 909 {\r
 910         PageListStruct  far *page;\r
 911 \r
 912         page = &gvar->pm.PMPages[pagenum];\r
 913         if (page->mainPage != -1)\r
 914                 return(gvar->pm.mm.MainMemPages[page->mainPage]);\r
 915         else if (page->emsPage != -1)\r
 916                 return(PML_GetEMSAddress(page->emsPage,page->locked, gvar));\r
 917         else\r
 918                 return(nil);\r
 919 }\r
 920 \r
 921 //\r
 922 //      PML_GiveLRUPage() - Returns the page # of the least recently used\r
 923 //              present & unlocked main/EMS page (or main page if mainonly is true)\r
 924 //\r
 925 int\r
 926 PML_GiveLRUPage(boolean mainonly, global_game_variables_t *gvar)\r
 927 {\r
 928         int                             i,lru;\r
 929         long                    last;\r
 930         PageListStruct  far *page;\r
 931 \r
 932         for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 933         {\r
 934                 if\r
 935                 (\r
 936                         (page->lastHit < last)\r
 937                 &&      ((page->emsPage != -1) || (page->mainPage != -1))\r
 938                 &&      (page->locked == pml_Unlocked)\r
 939                 &&      (!(mainonly && (page->mainPage == -1)))\r
 940                 )\r
 941                 {\r
 942                         last = page->lastHit;\r
 943                         lru = i;\r
 944                 }\r
 945         }\r
 946 \r
 947         if (lru == -1)\r
 948                 Quit("PML_GiveLRUPage: LRU Search failed");\r
 949         return(lru);\r
 950 }\r
 951 \r
 952 //\r
 953 //      PML_GiveLRUXMSPage() - Returns the page # of the least recently used\r
 954 //              (and present) XMS page.\r
 955 //      This routine won't return the XMS page protected (by XMSProtectPage)\r
 956 //\r
 957 int\r
 958 PML_GiveLRUXMSPage(global_game_variables_t *gvar)\r
 959 {\r
 960         int                             i,lru;\r
 961         long                    last;\r
 962         PageListStruct  far *page;\r
 963 \r
 964         for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 965         {\r
 966                 if\r
 967                 (\r
 968                         (page->xmsPage != -1)\r
 969                 &&      (page->lastHit < last)\r
 970                 &&      (i != gvar->pm.xmm.XMSProtectPage)\r
 971                 )\r
 972                 {\r
 973                         last = page->lastHit;\r
 974                         lru = i;\r
 975                 }\r
 976         }\r
 977         return(lru);\r
 978 }\r
 979 \r
 980 //\r
 981 //      PML_PutPageInXMS() - If page isn't in XMS, find LRU XMS page and replace\r
 982 //              it with the main/EMS page\r
 983 //\r
 984 void\r
 985 PML_PutPageInXMS(int pagenum, global_game_variables_t *gvar)\r
 986 {\r
 987         int                             usexms;\r
 988         PageListStruct  far *page;\r
 989 \r
 990         if (!gvar->pm.xmm.XMSPresent)\r
 991                 return;\r
 992 \r
 993         page = &gvar->pm.PMPages[pagenum];\r
 994         if (page->xmsPage != -1)\r
 995                 return;                                 // Already in XMS\r
 996 \r
 997         if (gvar->pm.XMSPagesUsed < gvar->pm.xmm.XMSPagesAvail)\r
 998                 page->xmsPage = gvar->pm.XMSPagesUsed++;\r
 999         else\r
1000         {\r
1001                 usexms = PML_GiveLRUXMSPage(gvar);\r
1002                 if (usexms == -1)\r
1003                         Quit("PML_PutPageInXMS: No XMS LRU");\r
1004                 page->xmsPage = gvar->pm.PMPages[usexms].xmsPage;\r
1005                 gvar->pm.PMPages[usexms].xmsPage = -1;\r
1006         }\r
1007         PML_CopyToXMS(PM_GetPageAddress(pagenum, gvar),page->xmsPage,page->length, gvar);\r
1008 }\r
1009 \r
1010 //\r
1011 //      PML_TransferPageSpace() - A page is being replaced, so give the new page\r
1012 //              the old one's address space. Returns the address of the new page.\r
1013 //\r
1014 memptr\r
1015 PML_TransferPageSpace(int orig,int new, global_game_variables_t *gvar)\r
1016 {\r
1017         memptr                  addr;\r
1018         PageListStruct  far *origpage,far *newpage;\r
1019 \r
1020         if (orig == new)\r
1021                 Quit("PML_TransferPageSpace: Identity replacement");\r
1022 \r
1023         origpage = &gvar->pm.PMPages[orig];\r
1024         newpage = &gvar->pm.PMPages[new];\r
1025 \r
1026         if (origpage->locked != pml_Unlocked)\r
1027                 Quit("PML_TransferPageSpace: Killing locked page");\r
1028 \r
1029         if ((origpage->emsPage == -1) && (origpage->mainPage == -1))\r
1030                 Quit("PML_TransferPageSpace: Reusing non-existent page");\r
1031 \r
1032         // Copy page that's about to be purged into XMS\r
1033         PML_PutPageInXMS(orig, gvar);\r
1034 \r
1035         // Get the address, and force EMS into a physical page if necessary\r
1036         addr = PM_GetPageAddress(orig, gvar);\r
1037 \r
1038         // Steal the address\r
1039         newpage->emsPage = origpage->emsPage;\r
1040         newpage->mainPage = origpage->mainPage;\r
1041 \r
1042         // Mark replaced page as purged\r
1043         origpage->mainPage = origpage->emsPage = -1;\r
1044 \r
1045         if (!addr)\r
1046                 Quit("PML_TransferPageSpace: Zero replacement");\r
1047 \r
1048         return(addr);\r
1049 }\r
1050 \r
1051 //\r
1052 //      PML_GetAPageBuffer() - A page buffer is needed. Either get it from the\r
1053 //              main/EMS free pool, or use PML_GiveLRUPage() to find which page to\r
1054 //              steal the buffer from. Returns a far pointer to the page buffer, and\r
1055 //              sets the fields inside the given page structure appropriately.\r
1056 //              If mainonly is true, free EMS will be ignored, and only main pages\r
1057 //              will be looked at by PML_GiveLRUPage().\r
1058 //\r
1059 byte far *\r
1060 PML_GetAPageBuffer(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
1061 {\r
1062         byte                    far *addr = nil;\r
1063         int                             i,n;\r
1064         PMBlockAttr             *used;\r
1065         PageListStruct  far *page;\r
1066 \r
1067         page = &gvar->pm.PMPages[pagenum];\r
1068         if ((gvar->pm.EMSPagesUsed < gvar->pm.emm.EMSPagesAvail) && !mainonly)\r
1069         {\r
1070                 // There's remaining EMS - use it\r
1071                 page->emsPage = gvar->pm.EMSPagesUsed++;\r
1072                 addr = PML_GetEMSAddress(page->emsPage,page->locked, gvar);\r
1073         }\r
1074         else if (gvar->pm.MainPagesUsed < gvar->pm.mm.MainPagesAvail)\r
1075         {\r
1076                 // There's remaining main memory - use it\r
1077                 for (i = 0,n = -1,used = gvar->pm.mm.MainMemUsed;i < PMMaxMainMem;i++,used++)\r
1078                 {\r
1079                         if ((*used & pmba_Allocated) && !(*used & pmba_Used))\r
1080                         {\r
1081                                 n = i;\r
1082                                 *used |= pmba_Used;\r
1083                                 break;\r
1084                         }\r
1085                 }\r
1086                 if (n == -1)\r
1087                         Quit("PML_GetPageBuffer: MainPagesAvail lied");\r
1088                 addr = gvar->pm.mm.MainMemPages[n];\r
1089                 if (!addr)\r
1090                         Quit("PML_GetPageBuffer: Purged main block");\r
1091                 page->mainPage = n;\r
1092                 gvar->pm.MainPagesUsed++;\r
1093         }\r
1094         else\r
1095                 addr = PML_TransferPageSpace(PML_GiveLRUPage(mainonly, gvar),pagenum, gvar);\r
1096 \r
1097         if (!addr)\r
1098                 Quit("PML_GetPageBuffer: Search failed");\r
1099         return(addr);\r
1100 }\r
1101 \r
1102 //\r
1103 //      PML_GetPageFromXMS() - If page is in XMS, find LRU main/EMS page and\r
1104 //              replace it with the page from XMS. If mainonly is true, will only\r
1105 //              search for LRU main page.\r
1106 //      XMSProtectPage is set to the page to be retrieved from XMS, so that if\r
1107 //              the page from which we're stealing the main/EMS from isn't in XMS,\r
1108 //              it won't copy over the page that we're trying to get from XMS.\r
1109 //              (pages that are being purged are copied into XMS, if possible)\r
1110 //\r
1111 memptr\r
1112 PML_GetPageFromXMS(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
1113 {\r
1114         byte                    far *checkaddr;\r
1115         memptr                  addr = nil;\r
1116         PageListStruct  far *page;\r
1117 \r
1118         page = &gvar->pm.PMPages[pagenum];\r
1119         if (gvar->pm.xmm.XMSPresent && (page->xmsPage != -1))\r
1120         {\r
1121                 gvar->pm.xmm.XMSProtectPage = pagenum;\r
1122                 checkaddr = PML_GetAPageBuffer(pagenum,mainonly, gvar);\r
1123                 if (FP_OFF(checkaddr))\r
1124                         Quit("PML_GetPageFromXMS: Non segment pointer");\r
1125                 addr = (memptr)FP_SEG(checkaddr);\r
1126                 PML_CopyFromXMS(addr,page->xmsPage,page->length, gvar);\r
1127                 gvar->pm.xmm.XMSProtectPage = -1;\r
1128         }\r
1129 \r
1130         return(addr);\r
1131 }\r
1132 \r
1133 //\r
1134 //      PML_LoadPage() - A page is not in main/EMS memory, and it's not in XMS.\r
1135 //              Load it into either main or EMS. If mainonly is true, the page will\r
1136 //              only be loaded into main.\r
1137 //\r
1138 void\r
1139 PML_LoadPage(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
1140 {\r
1141         byte                    far *addr;\r
1142         PageListStruct  far *page;\r
1143 \r
1144         addr = PML_GetAPageBuffer(pagenum,mainonly, gvar);\r
1145         page = &gvar->pm.PMPages[pagenum];\r
1146         PML_ReadFromFile(addr,page->offset,page->length, gvar);\r
1147 }\r
1148 \r
1149 //\r
1150 //      PM_GetPage() - Returns the address of the page, loading it if necessary\r
1151 //              First, check if in Main Memory or EMS\r
1152 //              Then, check XMS\r
1153 //              If not in XMS, load into Main Memory or EMS\r
1154 //\r
1155 #pragma warn -pia\r
1156 memptr\r
1157 PM_GetPage(int pagenum, global_game_variables_t *gvar)\r
1158 {\r
1159         memptr  result;\r
1160 \r
1161         if (pagenum >= gvar->pm.fi.ChunksInFile)\r
1162                 Quit("PM_GetPage: Invalid page request");\r
1163 \r
1164 #ifdef __DEBUG_2__      // for debugging\r
1165         __asm {\r
1166                 mov     dx,STATUS_REGISTER_1\r
1167                 in      al,dx\r
1168                 mov     dx,ATR_INDEX\r
1169                 mov     al,ATR_OVERSCAN\r
1170                 out     dx,al\r
1171                 mov     al,10   // bright green\r
1172                 out     dx,al\r
1173         }\r
1174 #endif\r
1175 \r
1176         if (!(result = PM_GetPageAddress(pagenum, gvar)))\r
1177         {\r
1178                 boolean mainonly = (pagenum >= gvar->pm.fi.PMSoundStart);\r
1179 if (!gvar->pm.PMPages[pagenum].offset)  // JDC: sparse page\r
1180         Quit ("Tried to load a sparse page!");\r
1181                 if (!(result = PML_GetPageFromXMS(pagenum,mainonly, gvar)))\r
1182                 {\r
1183                         if (gvar->pm.PMPages[pagenum].lastHit ==  gvar->pm.PMFrameCount)\r
1184                                 gvar->pm.PMThrashing++;\r
1185 \r
1186                         PML_LoadPage(pagenum,mainonly, gvar);\r
1187                         result = PM_GetPageAddress(pagenum, gvar);\r
1188                 }\r
1189         }\r
1190         gvar->pm.PMPages[pagenum].lastHit =  gvar->pm.PMFrameCount;\r
1191 \r
1192 #ifdef __DEBUG_2__      // for debugging\r
1193         __asm{\r
1194                 mov     dx,STATUS_REGISTER_1\r
1195                 in      al,dx\r
1196                 mov     dx,ATR_INDEX\r
1197                 mov     al,ATR_OVERSCAN\r
1198                 out     dx,al\r
1199                 mov     al,3    // blue\r
1200                 out     dx,al\r
1201                 mov     al,0x20 // normal\r
1202                 out     dx,al\r
1203 #endif\r
1204 \r
1205         return(result);\r
1206 }\r
1207 #pragma warn +pia\r
1208 \r
1209 //\r
1210 //      PM_SetPageLock() - Sets the lock type on a given page\r
1211 //              pml_Unlocked: Normal, page can be purged\r
1212 //              pml_Locked: Cannot be purged\r
1213 //              pml_EMS?: Same as pml_Locked, but if in EMS, use the physical page\r
1214 //                                      specified when returning the address. For sound stuff.\r
1215 //\r
1216 void\r
1217 PM_SetPageLock(int pagenum,PMLockType lock, global_game_variables_t *gvar)\r
1218 {\r
1219         if (pagenum < gvar->pm.fi.PMSoundStart)\r
1220                 Quit("PM_SetPageLock: Locking/unlocking non-sound page");\r
1221 \r
1222         gvar->pm.PMPages[pagenum].locked = lock;\r
1223 }\r
1224 \r
1225 //\r
1226 //      PM_Preload() - Loads as many pages as possible into all types of memory.\r
1227 //              Calls the update function after each load, indicating the current\r
1228 //              page, and the total pages that need to be loaded (for thermometer).\r
1229 //\r
1230 void\r
1231 PM_Preload(boolean (*update)(word current,word total), global_game_variables_t *gvar)\r
1232 {\r
1233         int                             i,j,\r
1234                                         page,oogypage;\r
1235         word                    current,total,\r
1236                                         totalnonxms,totalxms,\r
1237                                         mainfree,maintotal,\r
1238                                         emsfree,emstotal,\r
1239                                         xmsfree,xmstotal;\r
1240         memptr                  addr;\r
1241         PageListStruct  far *p;\r
1242 \r
1243         mainfree = (gvar->pm.mm.MainPagesAvail - gvar->pm.MainPagesUsed) + (gvar->pm.emm.EMSPagesAvail - gvar->pm.EMSPagesUsed);\r
1244         xmsfree = (gvar->pm.xmm.XMSPagesAvail - gvar->pm.XMSPagesUsed);\r
1245 \r
1246         xmstotal = maintotal = 0;\r
1247 \r
1248         for (i = 0;i < gvar->pm.fi.ChunksInFile;i++)\r
1249         {\r
1250                 if (!gvar->pm.PMPages[i].offset)\r
1251                         continue;                       // sparse\r
1252 \r
1253                 if ( gvar->pm.PMPages[i].emsPage != -1 || gvar->pm.PMPages[i].mainPage != -1 )\r
1254                         continue;                       // already in main mem\r
1255 \r
1256                 if ( mainfree )\r
1257                 {\r
1258                         maintotal++;\r
1259                         mainfree--;\r
1260                 }\r
1261                 else if ( xmsfree && (gvar->pm.PMPages[i].xmsPage == -1) )\r
1262                 {\r
1263                         xmstotal++;\r
1264                         xmsfree--;\r
1265                 }\r
1266         }\r
1267 \r
1268 \r
1269         total = maintotal + xmstotal;\r
1270 \r
1271         if (!total)\r
1272                 return;\r
1273 \r
1274         page = 0;\r
1275         current = 0;\r
1276 \r
1277 //\r
1278 // cache main/ems blocks\r
1279 //\r
1280         while (maintotal)\r
1281         {\r
1282                 while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].mainPage != -1\r
1283                         ||      gvar->pm.PMPages[page].emsPage != -1 )\r
1284                         page++;\r
1285 \r
1286                 if (page >= gvar->pm.fi.ChunksInFile)\r
1287                         Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");\r
1288 \r
1289                 PM_GetPage(page, gvar);\r
1290 \r
1291                 page++;\r
1292                 current++;\r
1293                 maintotal--;\r
1294                 update(current,total);\r
1295         }\r
1296 \r
1297 //\r
1298 // load stuff to XMS\r
1299 //\r
1300         if (xmstotal)\r
1301         {\r
1302                 for (oogypage = 0 ; gvar->pm.PMPages[oogypage].mainPage == -1 ; oogypage++)\r
1303                 ;\r
1304                 addr = PM_GetPage(oogypage, gvar);\r
1305                 if (!addr)\r
1306                         Quit("PM_Preload: XMS buffer failed");\r
1307 \r
1308                 while (xmstotal)\r
1309                 {\r
1310                         while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].xmsPage != -1 )\r
1311                                 page++;\r
1312 \r
1313                         if (page >= gvar->pm.fi.ChunksInFile)\r
1314                                 Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");\r
1315 \r
1316                         p = &gvar->pm.PMPages[page];\r
1317 \r
1318                         p->xmsPage = gvar->pm.XMSPagesUsed++;\r
1319                         if (gvar->pm.XMSPagesUsed > gvar->pm.xmm.XMSPagesAvail)\r
1320                                 Quit("PM_Preload: Exceeded XMS pages");\r
1321                         if (p->length > PMPageSize)\r
1322                                 Quit("PM_Preload: Page too long");\r
1323 \r
1324                         PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);\r
1325                         PML_CopyToXMS((byte far *)addr,p->xmsPage,p->length, gvar);\r
1326 \r
1327                         page++;\r
1328                         current++;\r
1329                         xmstotal--;\r
1330                         update(current,total);\r
1331                 }\r
1332 \r
1333                 p = &gvar->pm.PMPages[oogypage];\r
1334                 PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);\r
1335         }\r
1336 \r
1337         update(total,total);\r
1338 }\r
1339 \r
1340 /////////////////////////////////////////////////////////////////////////////\r
1341 //\r
1342 //      General code\r
1343 //\r
1344 /////////////////////////////////////////////////////////////////////////////\r
1345 \r
1346 //\r
1347 //      PM_NextFrame() - Increments the frame counter and adjusts the thrash\r
1348 //              avoidence variables\r
1349 //\r
1350 //              If currently in panic mode (to avoid thrashing), check to see if the\r
1351 //                      appropriate number of frames have passed since the last time that\r
1352 //                      we would have thrashed. If so, take us out of panic mode.\r
1353 //\r
1354 //\r
1355 void\r
1356 PM_NextFrame(global_game_variables_t *gvar)\r
1357 {\r
1358         int     i;\r
1359 \r
1360         // Frame count overrun - kill the LRU hit entries & reset frame count\r
1361         if (++gvar->pm.PMFrameCount >= LONG_MAX - 4)\r
1362         {\r
1363                 for (i = 0;i < gvar->pm.PMNumBlocks;i++)\r
1364                         gvar->pm.PMPages[i].lastHit = 0;\r
1365                 gvar->pm.PMFrameCount = 0;\r
1366         }\r
1367 \r
1368 //#if 0\r
1369         for (i = 0;i < gvar->pm.fi.PMSoundStart;i++)\r
1370         {\r
1371                 if (gvar->pm.PMPages[i].locked)\r
1372                 {\r
1373                         char buf[40];\r
1374                         sprintf(buf,"PM_NextFrame: Page %d is locked",i);\r
1375                         Quit(buf);\r
1376                 }\r
1377         }\r
1378 //#endif\r
1379 \r
1380         if (gvar->pm.PMPanicMode)\r
1381         {\r
1382                 // DEBUG - set border color\r
1383                 if ((!gvar->pm.PMThrashing) && (!--gvar->pm.PMPanicMode))\r
1384                 {\r
1385                         // DEBUG - reset border color\r
1386                 }\r
1387         }\r
1388         if (gvar->pm.PMThrashing >= PMThrashThreshold)\r
1389                 gvar->pm.PMPanicMode = PMUnThrashThreshold;\r
1390         gvar->pm.PMThrashing = false;\r
1391 }\r
1392 \r
1393 //\r
1394 //      PM_Reset() - Sets up caching structures\r
1395 //\r
1396 void\r
1397 PM_Reset(global_game_variables_t *gvar)\r
1398 {\r
1399         int                             i;\r
1400         PageListStruct  far *page;\r
1401 \r
1402         gvar->pm.xmm.XMSPagesAvail = gvar->pm.xmm.XMSAvail / PMPageSizeKB;\r
1403 \r
1404         gvar->pm.emm.EMSPagesAvail = gvar->pm.emm.EMSAvail * (EMSPageSizeKB / PMPageSizeKB);\r
1405         gvar->pm.emm.EMSPhysicalPage = 0;\r
1406 \r
1407         gvar->pm.MainPagesUsed = gvar->pm.EMSPagesUsed = gvar->pm.XMSPagesUsed = 0;\r
1408 \r
1409         gvar->pm.PMPanicMode = false;\r
1410 \r
1411         gvar->pm.fi.PageFile = -1;\r
1412         gvar->pm.xmm.XMSProtectPage = -1;\r
1413 \r
1414         // Initialize page list\r
1415         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.PMNumBlocks;i++,page++)\r
1416         {\r
1417                 page->mainPage = -1;\r
1418                 page->emsPage = -1;\r
1419                 page->xmsPage = -1;\r
1420                 page->locked = false;\r
1421         }\r
1422 }\r
1423 \r
1424 //\r
1425 //      PM_Startup() - Start up the Page Mgr\r
1426 //\r
1427 void\r
1428 PM_Startup(global_game_variables_t *gvar)\r
1429 {\r
1430         boolean nomain,noems,noxms;\r
1431         int             i;\r
1432 \r
1433         if (gvar->pm.PMStarted)\r
1434                 return;\r
1435 \r
1436         //strcpy(&(gvar->pm.fi.PageFileName), "VSWAP.");\r
1437 \r
1438         nomain = noems = noxms = false;\r
1439         for (i = 1;i <\r
1440 #ifdef __WATCOMC__\r
1441         __argc\r
1442 #endif\r
1443 #ifdef __BORLANDC__\r
1444         _argc\r
1445 #endif\r
1446         ;i++)\r
1447         {\r
1448                 switch (US_CheckParm(\r
1449 #ifdef __WATCOMC__\r
1450         __argv[i]\r
1451 #endif\r
1452 #ifdef __BORLANDC__\r
1453         _argv[i]\r
1454 #endif\r
1455                 ,ParmStrings))\r
1456                 {\r
1457                 case 0:\r
1458                         nomain = true;\r
1459                         break;\r
1460                 case 1:\r
1461                         noems = true;\r
1462                         break;\r
1463                 case 2:\r
1464                         noxms = true;\r
1465                         break;\r
1466                 }\r
1467         }\r
1468 \r
1469         //0000+=+=PML_OpenPageFile(gvar);\r
1470 \r
1471         if (!noems)\r
1472                 PML_StartupEMS(gvar);\r
1473         /*if (!noxms)\r
1474         {\r
1475                 //++++\r
1476                 printf("PML_StartupXMS ");\r
1477                 PML_StartupXMS(gvar);   //TODO: convert\r
1478                 printf("ok!\n");\r
1479         }*/\r
1480 \r
1481         if (!nomain && !gvar->pm.emm.EMSPresent)\r
1482         {\r
1483                 Quit("PM_Startup: No main or EMS\n");\r
1484                 //return;\r
1485         }\r
1486         PML_StartupMainMem(gvar);\r
1487 \r
1488         PM_Reset(gvar);\r
1489 \r
1490         gvar->pm.PMStarted = true;\r
1491 }\r
1492 \r
1493 //\r
1494 //      PM_Shutdown() - Shut down the Page Mgr\r
1495 //\r
1496 void\r
1497 PM_Shutdown(global_game_variables_t *gvar)\r
1498 {\r
1499         PML_ShutdownXMS(gvar);\r
1500         PML_ShutdownEMS(gvar);\r
1501 \r
1502         if (!gvar->pm.PMStarted)\r
1503                 return;\r
1504 \r
1505         PML_ClosePageFile(gvar);\r
1506 \r
1507         PML_ShutdownMainMem(gvar);\r
1508 }\r