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 dbg_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         dword           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    err, str[160];\r
  87         unsigned        EMShandle;\r
  88         int     i;\r
  89 \r
  90         boolean errorflag=false;\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     errorme\r
 101                 jmp     Endme\r
 102 #ifdef __BORLANDC__\r
 103         }\r
 104 #endif\r
 105                 errorme:\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                 Endme:\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    err, str[64];\r
 144 \r
 145         boolean errorflag=false;\r
 146         static char     emmname[] = "EMMXXXX0"; //fix by andrius4669\r
 147         unsigned int EMSVer = 0;\r
 148         unsigned        totalEMSpages,freeEMSpages,EMSPageFrame,EMSHandle,EMSAvail;\r
 149         totalEMSpages = freeEMSpages = EMSPageFrame = 0;\r
 150         gvar->pm.emm.EMSPresent = false;                        // Assume that we'll fail\r
 151         gvar->pm.emm.EMSAvail = 0;\r
 152         gvar->mmi.EMSmem = 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 = EMSAvail * (dword)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(gvar->pm.emm.EMSPresent);\r
 281         }\r
 282 \r
 283         gvar->pm.emm.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(gvar->pm.emm.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,str[64];\r
 302 \r
 303         boolean errorflag=false;\r
 304         EMSHandle=gvar->pm.emm.EMSHandle;\r
 305 \r
 306         if (gvar->pm.emm.EMSPresent)\r
 307         {\r
 308                 __asm {\r
 309                         mov     ah,EMS_FREEPAGES\r
 310                         mov     dx,[EMSHandle]\r
 311                         int     EMS_INT\r
 312                         jc      errores\r
 313                         jmp     Endes\r
 314 #ifdef __BORLANDC__\r
 315                 }\r
 316 #endif\r
 317                         errores:\r
 318 #ifdef __BORLANDC__\r
 319                 __asm {\r
 320 #endif\r
 321                         mov     err,ah\r
 322                         mov     errorflag,1\r
 323                         jmp     Endes\r
 324 #ifdef __BORLANDC__\r
 325                 }\r
 326 #endif\r
 327                         Endes:\r
 328 #ifdef __WATCOMC__\r
 329                 }\r
 330 #endif\r
 331                 if(errorflag==true)\r
 332                 {\r
 333                         strcpy(str,"PML_ShutdownEMS: Error freeing EMS ");\r
 334                         MM_EMSerr(str, err);\r
 335                         printf("%s\n",str);\r
 336                         Quit("PML_ShutdownEMS: Error freeing EMS\n");\r
 337                         //return;\r
 338                 }\r
 339         }\r
 340 }\r
 341 \r
 342 /////////////////////////////////////////////////////////////////////////////\r
 343 //\r
 344 //      XMS Management code\r
 345 //\r
 346 /////////////////////////////////////////////////////////////////////////////\r
 347 \r
 348 //\r
 349 //      PML_StartupXMS() - Starts up XMS for the Page Mgr's use\r
 350 //              Checks for presence of an XMS driver\r
 351 //              Makes sure that there's at least a page of XMS available\r
 352 //              Allocates any remaining XMS (rounded down to the nearest page size)\r
 353 //\r
 354 boolean\r
 355 PML_StartupXMS(global_game_variables_t *gvar)\r
 356 {\r
 357 //#define STARTUPXMSASM\r
 358         byte err;\r
 359 #ifndef STARTUPXMSASM\r
 360 #define XMSAVI  gvar->pm.xmm.XMSAvail\r
 361 #define XMSHAN gvar->pm.xmm.XMSHandle\r
 362 #else\r
 363         #define BRACKETXMS\r
 364         word XMSAvail, XMSHandle;\r
 365 #define XMSAVI  XMSAvail\r
 366 #define XMSHAN XMSHandle\r
 367 #endif\r
 368 //++++  word XMSVer;\r
 369         boolean errorflag=false;\r
 370         word e=0;\r
 371         gvar->pm.xmm.XMSPresent = false;                                        // Assume failure\r
 372         XMSAVI = gvar->mmi.XMSmem = 0;\r
 373 \r
 374         __asm {\r
 375                 mov     ax,0x4300\r
 376                 int     XMS_INT                                         // Check for presence of XMS driver\r
 377                 cmp     al,0x80\r
 378                 jne     error1\r
 379                 mov     e,1\r
 380 \r
 381                 mov     ax,0x4310\r
 382                 int     XMS_INT                                                 // Get address of XMS driver\r
 383                 mov     [WORD PTR XMSDriver],bx\r
 384                 mov     [WORD PTR XMSDriver+2],es               // function pointer to XMS driver\r
 385 //++++          mov     ah,0\r
 386 //++++          call    [DWORD PTR XMSDriver]                                           //; Get XMS Version Number\r
 387 //++++          mov     [XMSVer],ax\r
 388                 mov     e,2\r
 389 \r
 390 #ifdef STARTUPXMSASM\r
 391                 mov     ah,XMS_QUERYFREE                        // Find out how much XMS is available\r
 392                 call    [DWORD PTR XMSDriver]//DWORD PTR\r
 393 #ifndef BRACKETXMS\r
 394                 mov     XMSAVI,ax\r
 395 #else\r
 396                 mov     [XMSAVI],ax\r
 397 #endif\r
 398                 or      ax,ax                           // AJR: bugfix 10/8/92\r
 399                 jz      error1\r
 400                 mov     e,3\r
 401 #endif\r
 402                 jmp     End1\r
 403 #ifdef __BORLANDC__\r
 404         }\r
 405 #endif\r
 406         error1:\r
 407 #ifdef __BORLANDC__\r
 408         __asm {\r
 409 #endif\r
 410                 mov     err,bl\r
 411                 mov     errorflag,1\r
 412                 jmp End1\r
 413 #ifdef __BORLANDC__\r
 414         }\r
 415 #endif\r
 416 End1:\r
 417 #ifdef __WATCOMC__\r
 418         }\r
 419 #endif\r
 420         if(errorflag==true) goto error;\r
 421 #ifndef STARTUPXMSASM\r
 422         XMS_CALL(XMS_QUERYFREE);                        // Find out how much XMS is available\r
 423         XMSAVI = _AX;\r
 424         if (!_AX)                               // AJR: bugfix 10/8/92\r
 425         {\r
 426                 errorflag = true;\r
 427                 err = _BL;\r
 428                 goto error;\r
 429         }\r
 430         e++;\r
 431 #endif\r
 432 \r
 433 #ifdef __DEBUG_PM__\r
 434 //++++  printf("XMSVer=%02X     ", XMSVer);\r
 435         printf("XMSAvail=%u\n", XMSAVI);\r
 436 #endif\r
 437         XMSAVI &= ~(PMPageSizeKB - 1);  // Round off to nearest page size\r
 438         if (XMSAVI < (PMPageSizeKB * 2))        // Need at least 2 pages\r
 439         {\r
 440                 errorflag=true;\r
 441                 goto error;\r
 442         }\r
 443 #ifdef STARTUPXMSASM\r
 444         __asm {\r
 445 #ifndef BRACKETXMS\r
 446                 mov     dx,XMSAVI\r
 447 #else\r
 448                 mov     dx,[XMSAVI]\r
 449 #endif\r
 450                 mov     ah,XMS_ALLOC                            // And do the allocation\r
 451                 call    [DWORD PTR XMSDriver]//DWORD PTR\r
 452 #ifndef BRACKETXMS\r
 453                 mov     XMSHAN,dx\r
 454 #else\r
 455                 mov     [XMSHAN],dx\r
 456 #endif\r
 457                 or      ax,ax                           // AJR: bugfix 10/8/92\r
 458                 jz      error2\r
 459                 mov     e,4\r
 460                 jmp     End2\r
 461 #ifdef __BORLANDC__\r
 462         }\r
 463 #endif\r
 464         error2:\r
 465 #ifdef __BORLANDC__\r
 466         __asm {\r
 467 #endif\r
 468                 mov     err,bl\r
 469                 mov     errorflag,1\r
 470                 jmp End2\r
 471 #ifdef __BORLANDC__\r
 472         }\r
 473 #endif\r
 474 End2:\r
 475 #ifdef __WATCOMC__\r
 476         }\r
 477 #endif\r
 478 #else\r
 479         _DX = XMSAVI;\r
 480         XMS_CALL(XMS_ALLOC);                            // And do the allocation\r
 481         XMSHAN = _DX;\r
 482         if (!_AX)                               // AJR: bugfix 10/8/92\r
 483         {\r
 484                 errorflag=true;\r
 485                 err = _BL;\r
 486                 goto error;\r
 487         }\r
 488         e++;\r
 489 #endif\r
 490 error:\r
 491         if(errorflag==false)\r
 492         {\r
 493                 gvar->mmi.XMSmem = (dword)(XMSAVI) * 1024;\r
 494 #ifdef STARTUPXMSASM\r
 495                 gvar->pm.xmm.XMSAvail = XMSAVI;\r
 496                 gvar->pm.xmm.XMSHandle = XMSHAN;\r
 497 #endif\r
 498 //++++          gvar->pm.xmm.XMSVer = XMSVer;\r
 499                 gvar->pm.xmm.XMSPresent = true;\r
 500 #ifdef __DEBUG_PM__\r
 501                 printf("        XMSmem=%lu      XMSAvail=%u\n", gvar->mmi.XMSmem, XMSAVI);\r
 502 #endif\r
 503         }\r
 504         else\r
 505         {\r
 506 #ifdef __DEBUG_PM__\r
 507                 //printf("XMSHandle\n");\r
 508                 //printf("      1=%u    2=%u    3=%u    4=%u\n", XMSHandle1, XMSHandle2, XMSHandle3, XMSHandle4);\r
 509                 //printf("      2=%u    ", XMSHandle);\r
 510                 //printf("      %u", gvar->pm.xmm.XMSHandle);\r
 511                 printf("err=%02X        e=%u\n", err, e);\r
 512 #endif\r
 513         }\r
 514         return(gvar->pm.xmm.XMSPresent);\r
 515 }\r
 516 \r
 517 //\r
 518 //      PML_XMSCopy() - Copies a main/EMS page to or from XMS\r
 519 //              Will round an odd-length request up to the next even value\r
 520 //\r
 521 void\r
 522 PML_XMSCopy(boolean toxms,byte far *addr,word xmspage,word length, global_game_variables_t *gvar)\r
 523 {\r
 524         dword   xoffset;\r
 525         struct\r
 526         {\r
 527                 dword   length;\r
 528                 word            source_handle;\r
 529                 dword   source_offset;\r
 530                 word            target_handle;\r
 531                 dword   target_offset;\r
 532         } copy;\r
 533 \r
 534         if (!addr)\r
 535         {\r
 536                 Quit("PML_XMSCopy: zero address\n");\r
 537                 //return;\r
 538         }\r
 539 \r
 540         xoffset = (dword)xmspage * PMPageSize;\r
 541 \r
 542         copy.length = (length + 1) & ~1;\r
 543         copy.source_handle = toxms? 0 : gvar->pm.xmm.XMSHandle;\r
 544         copy.source_offset = toxms? (long)addr : xoffset;\r
 545         copy.target_handle = toxms? gvar->pm.xmm.XMSHandle : 0;\r
 546         copy.target_offset = toxms? xoffset : (long)addr;\r
 547 \r
 548         __asm {\r
 549                 push si\r
 550         }\r
 551         _SI = (word)&copy;\r
 552         XMS_CALL(XMS_MOVE);\r
 553         __asm {\r
 554                 pop     si\r
 555         }\r
 556         if (!_AX)\r
 557         {\r
 558                 Quit("PML_XMSCopy: Error on copy");\r
 559                 //return;\r
 560         }\r
 561 }\r
 562 \r
 563 #if 1\r
 564 #define PML_CopyToXMS(s,t,l,gvar)       PML_XMSCopy(true,(s),(t),(l),(gvar))\r
 565 #define PML_CopyFromXMS(t,s,l,gvar)     PML_XMSCopy(false,(t),(s),(l),(gvar))\r
 566 #else\r
 567 //\r
 568 //      PML_CopyToXMS() - Copies the specified number of bytes from the real mode\r
 569 //              segment address to the specified XMS page\r
 570 //\r
 571 void\r
 572 PML_CopyToXMS(byte far *source,int targetpage,word length,global_game_variables_t *gvar)\r
 573 {\r
 574         PML_XMSCopy(true,source,targetpage,length, global_game_variables_t *gvar);\r
 575 }\r
 576 \r
 577 //\r
 578 //      PML_CopyFromXMS() - Copies the specified number of bytes from an XMS\r
 579 //              page to the specified real mode address\r
 580 //\r
 581 void\r
 582 PML_CopyFromXMS(byte far *target,int sourcepage,word length, global_game_variables_t *gvar)\r
 583 {\r
 584         PML_XMSCopy(false,target,sourcepage,length, global_game_variables_t *gvar);\r
 585 }\r
 586 #endif\r
 587 \r
 588 //\r
 589 //      PML_ShutdownXMS()\r
 590 //\r
 591 void\r
 592 PML_ShutdownXMS(global_game_variables_t *gvar)\r
 593 {\r
 594         boolean errorflag=false;\r
 595         word XMSHandle = gvar->pm.xmm.XMSHandle;\r
 596         if (gvar->pm.xmm.XMSPresent)\r
 597         {\r
 598                 __asm {\r
 599                         mov     dx,[XMSHandle]\r
 600                         //XMS_CALL(XMS_FREE);\r
 601                         mov     ah,XMS_FREE\r
 602                         call    [DWORD PTR XMSDriver]\r
 603                         or      bl,bl\r
 604                         jz      errorxs\r
 605                         jmp     Endxs\r
 606 #ifdef __BORLANDC__\r
 607                 }\r
 608 #endif\r
 609                         errorxs:\r
 610 #ifdef __BORLANDC__\r
 611                 __asm {\r
 612 #endif\r
 613                         //mov   err,ah\r
 614                         mov     errorflag,1\r
 615                         jmp     Endxs\r
 616 #ifdef __BORLANDC__\r
 617                 }\r
 618 #endif\r
 619                         Endxs:\r
 620 #ifdef __WATCOMC__\r
 621                 }\r
 622 #endif\r
 623                 if(errorflag==true)\r
 624                 {\r
 625                         Quit("PML_ShutdownXMS: Error freeing XMS");\r
 626                         //return;\r
 627                 }\r
 628         }\r
 629 }\r
 630 \r
 631 /////////////////////////////////////////////////////////////////////////////\r
 632 //\r
 633 //      Main memory code\r
 634 //\r
 635 /////////////////////////////////////////////////////////////////////////////\r
 636 \r
 637 //\r
 638 //      PM_SetMainMemPurge() - Sets the purge level for all allocated main memory\r
 639 //              blocks. This shouldn't be called directly - the PM_LockMainMem() and\r
 640 //              PM_UnlockMainMem() macros should be used instead.\r
 641 //\r
 642 void\r
 643 PM_SetMainMemPurge(int level, global_game_variables_t *gvar)\r
 644 {\r
 645         int     i;\r
 646 \r
 647         if(gvar->pm.mm.MainPresent)\r
 648         for (i = 0;i < PMMaxMainMem;i++)\r
 649         {\r
 650 #ifdef __DEBUG_PM__\r
 651                 printf("PM_SetMainMemPurge()    info of gvar->pm.mm.MainMemPages[i]\n");\r
 652                 printf("&       %Fp,    %Fp\n", &gvar->pm.mm.MainMemPages[i],   &(gvar->pm.mm.MainMemPages[i]));\r
 653 #endif\r
 654                 if (gvar->pm.mm.MainMemPages[i])\r
 655                         MM_SetPurge(&(gvar->pm.mm.MainMemPages[i]),level, gvar);\r
 656         }\r
 657 \r
 658         else\r
 659         {\r
 660                 Quit("MainPresent IS NULL\n");\r
 661         }\r
 662 }\r
 663 \r
 664 //\r
 665 //      PM_CheckMainMem() - If something besides the Page Mgr makes requests of\r
 666 //              the Memory Mgr, some of the Page Mgr's blocks may have been purged,\r
 667 //              so this function runs through the block list and checks to see if\r
 668 //              any of the blocks have been purged. If so, it marks the corresponding\r
 669 //              page as purged & unlocked, then goes through the block list and\r
 670 //              tries to reallocate any blocks that have been purged.\r
 671 //      This routine now calls PM_LockMainMem() to make sure that any allocation\r
 672 //              attempts made during the block reallocation sweep don't purge any\r
 673 //              of the other blocks. Because PM_LockMainMem() is called,\r
 674 //              PM_UnlockMainMem() needs to be called before any other part of the\r
 675 //              program makes allocation requests of the Memory Mgr.\r
 676 //\r
 677 void\r
 678 PM_CheckMainMem(global_game_variables_t *gvar)\r
 679 {\r
 680         boolean                 allocfailed;\r
 681         int                             i,n;\r
 682         memptr                  *p;\r
 683         PMBlockAttr             *used;\r
 684         PageListStruct  far *page;\r
 685 \r
 686         if (!gvar->pm.mm.MainPresent)\r
 687                 return;\r
 688 \r
 689         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 690         {\r
 691                 n = page->mainPage;\r
 692                 if (n != -1)                                            // Is the page using main memory?\r
 693                 {\r
 694                         if (!gvar->pm.mm.MainMemPages[n])                       // Yep, was the block purged?\r
 695                         {\r
 696                                 page->mainPage = -1;            // Yes, mark page as purged & unlocked\r
 697                                 page->locked = pml_Unlocked;\r
 698                         }\r
 699                 }\r
 700         }\r
 701 \r
 702         // Prevent allocation attempts from purging any of our other blocks\r
 703         PM_LockMainMem(gvar);\r
 704         allocfailed = false;\r
 705         for (i = 0,p = gvar->pm.mm.MainMemPages,used = gvar->pm.mm.MainMemUsed; i < PMMaxMainMem;i++,p++,used++)\r
 706         {\r
 707                 if (!*p)                                                        // If the page got purged\r
 708                 {\r
 709                         if (*used & pmba_Allocated)             // If it was allocated\r
 710                         {\r
 711                                 *used &= ~pmba_Allocated;       // Mark as unallocated\r
 712                                 gvar->pm.mm.MainPagesAvail--;                   // and decrease available count\r
 713                         }\r
 714 \r
 715                         if (*used & pmba_Used)                  // If it was used\r
 716                         {\r
 717                                 *used &= ~pmba_Used;            // Mark as unused\r
 718                                 gvar->pm.MainPagesUsed--;                       // and decrease used count\r
 719                         }\r
 720 \r
 721                         if (!allocfailed)\r
 722                         {\r
 723                                 MM_BombOnError(false, gvar);\r
 724                                 MM_GetPtr(p,PMPageSize, gvar);          // Try to reallocate\r
 725                                 if (gvar->mm.mmerror)                                   // If it failed,\r
 726                                         allocfailed = true;                     //  don't try any more allocations\r
 727                                 else                                                    // If it worked,\r
 728                                 {\r
 729                                         *used |= pmba_Allocated;        // Mark as allocated\r
 730                                         gvar->pm.mm.MainPagesAvail++;                   // and increase available count\r
 731                                 }\r
 732                                 MM_BombOnError(true, gvar);\r
 733                         }\r
 734                 }\r
 735         }\r
 736         if (gvar->mm.mmerror)\r
 737                 gvar->mm.mmerror = false;\r
 738 }\r
 739 \r
 740 //\r
 741 //      PML_StartupMainMem() - Allocates as much main memory as is possible for\r
 742 //              the Page Mgr. The memory is allocated as non-purgeable, so if it's\r
 743 //              necessary to make requests of the Memory Mgr, PM_UnlockMainMem()\r
 744 //              needs to be called.\r
 745 //\r
 746 void\r
 747 PML_StartupMainMem(global_game_variables_t *gvar)\r
 748 {\r
 749         int             i,n;\r
 750         memptr  *p;\r
 751 \r
 752         gvar->pm.mm.MainPagesAvail = 0;\r
 753         gvar->pm.mm.MainPresent = false;\r
 754         MM_BombOnError(false, gvar);\r
 755         for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)\r
 756         {\r
 757                 MM_GetPtr(p,PMPageSize, gvar);\r
 758                 if (gvar->mm.mmerror)\r
 759                         break;\r
 760 \r
 761                 gvar->pm.mm.MainPagesAvail++;\r
 762                 gvar->pm.mm.MainMemUsed[i] = pmba_Allocated;\r
 763         }\r
 764         MM_BombOnError(true, gvar);\r
 765         if (gvar->mm.mmerror)\r
 766                 gvar->mm.mmerror = false;\r
 767         if (gvar->pm.mm.MainPagesAvail < PMMinMainMem)\r
 768         {\r
 769                 Quit("PM_SetupMainMem: Not enough main memory");\r
 770                 //return;\r
 771         }\r
 772         gvar->pm.mm.MainPresent = true;\r
 773 }\r
 774 \r
 775 //\r
 776 //      PML_ShutdownMainMem() - Frees all of the main memory blocks used by the\r
 777 //              Page Mgr.\r
 778 //\r
 779 void\r
 780 PML_ShutdownMainMem(global_game_variables_t *gvar)\r
 781 {\r
 782         int             i;\r
 783         memptr  *p;\r
 784 \r
 785         // DEBUG - mark pages as unallocated & decrease page count as appropriate\r
 786         for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)\r
 787                 if (*p)\r
 788                         MM_FreePtr(p, gvar);\r
 789 }\r
 790 \r
 791 /////////////////////////////////////////////////////////////////////////////\r
 792 //\r
 793 //      File management code\r
 794 //\r
 795 /////////////////////////////////////////////////////////////////////////////\r
 796 \r
 797 //\r
 798 //      PML_ReadFromFile() - Reads some data in from the page file\r
 799 //\r
 800 void\r
 801 PML_ReadFromFile(byte far *buf,long offset,word length, global_game_variables_t *gvar)\r
 802 {\r
 803         if (!buf)\r
 804         {\r
 805                 Quit("PML_ReadFromFile: Null pointer");\r
 806                 //return;\r
 807         }\r
 808         if (!offset)\r
 809         {\r
 810                 Quit("PML_ReadFromFile: Zero offset");\r
 811                 //return;\r
 812         }\r
 813         if (lseek(gvar->pm.fi.PageFile,offset,SEEK_SET) != offset)\r
 814         {\r
 815                 Quit("PML_ReadFromFile: Seek failed");\r
 816                 //return;\r
 817         }\r
 818         if (!CA_FarRead(gvar->pm.fi.PageFile,buf,length, gvar))\r
 819         {\r
 820                 Quit("PML_ReadFromFile: Read failed");\r
 821                 //return;\r
 822         }\r
 823 }\r
 824 \r
 825 //\r
 826 //      PML_OpenPageFile() - Opens the page file and sets up the page info\r
 827 //\r
 828 void\r
 829 PML_OpenPageFile(global_game_variables_t *gvar)\r
 830 {\r
 831         int                             i;\r
 832         long                    size;\r
 833                                 //__SEGA buf;\r
 834         memptr          buf;\r
 835         dword           far *offsetptr;\r
 836         word                    far *lengthptr;\r
 837         PageListStruct  far *page;\r
 838 \r
 839         gvar->pm.fi.PageFile = open(gvar->pm.fi.PageFileName,O_RDONLY + O_BINARY);\r
 840         if (gvar->pm.fi.PageFile == -1)\r
 841         {\r
 842                 Quit("PML_OpenPageFile: Unable to open page file");\r
 843                 //return;\r
 844         }\r
 845 \r
 846         // Read in header variables\r
 847         read(gvar->pm.fi.PageFile,&gvar->pm.fi.ChunksInFile,sizeof(gvar->pm.fi.ChunksInFile));\r
 848         read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSpriteStart,sizeof(gvar->pm.fi.PMSpriteStart));\r
 849         read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSoundStart,sizeof(gvar->pm.fi.PMSoundStart));\r
 850 \r
 851         // Allocate and clear the page list\r
 852         gvar->pm.PMNumBlocks = gvar->pm.fi.ChunksInFile;\r
 853         MM_GetPtr((memptr *)gvar->pm.PMSegPages, sizeof(PageListStruct) * (gvar->pm.PMNumBlocks), gvar);\r
 854         MM_SetLock((memptr *)gvar->pm.PMSegPages,true, gvar);\r
 855         gvar->pm.PMPages = (PageListStruct far *)gvar->pm.PMSegPages;\r
 856         _fmemset(gvar->pm.PMPages,0,sizeof(PageListStruct) * gvar->pm.PMNumBlocks);\r
 857 \r
 858         // Read in the chunk offsets\r
 859         size = sizeof(dword) * gvar->pm.fi.ChunksInFile;\r
 860         MM_GetPtr(&buf, size, gvar);\r
 861         if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))\r
 862         {\r
 863                 Quit("PML_OpenPageFile: Offset read failed");\r
 864                 //return;\r
 865         }\r
 866         offsetptr = (dword far *)buf;\r
 867         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 868                 page->offset = *offsetptr++;\r
 869         MM_FreePtr(&buf, gvar);\r
 870 \r
 871         // Read in the chunk lengths\r
 872         size = sizeof(word) * gvar->pm.fi.ChunksInFile;\r
 873         MM_GetPtr(&buf,size, gvar);\r
 874         if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))\r
 875         {\r
 876                 Quit("PML_OpenPageFile: Length read failed");\r
 877                 //return;\r
 878         }\r
 879         lengthptr = (word far *)buf;\r
 880         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 881                 page->length = *lengthptr++;\r
 882         MM_FreePtr(&buf, gvar);\r
 883 }\r
 884 \r
 885 //\r
 886 //  PML_ClosePageFile() - Closes the page file\r
 887 //\r
 888 void\r
 889 PML_ClosePageFile(global_game_variables_t *gvar)\r
 890 {\r
 891         if (gvar->pm.fi.PageFile != -1)\r
 892                 close(gvar->pm.fi.PageFile);\r
 893         if (gvar->pm.PMSegPages)\r
 894         {\r
 895                 MM_SetLock((memptr)gvar->pm.PMSegPages,false, gvar);\r
 896                 MM_FreePtr((memptr)gvar->pm.PMSegPages, gvar);\r
 897         }\r
 898 }\r
 899 \r
 900 /////////////////////////////////////////////////////////////////////////////\r
 901 //\r
 902 //      Allocation, etc., code\r
 903 //\r
 904 /////////////////////////////////////////////////////////////////////////////\r
 905 \r
 906 //\r
 907 //      PML_GetEMSAddress()\r
 908 //\r
 909 //              Page is in EMS, so figure out which EMS physical page should be used\r
 910 //              to map our page in. If normal page, use EMS physical page 3, else\r
 911 //              use the physical page specified by the lock type\r
 912 //\r
 913 #ifndef __DEBUG_2__\r
 914 #pragma argsused        // DEBUG - remove lock parameter\r
 915 memptr\r
 916 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)\r
 917 {\r
 918         int             i,emspage;\r
 919         word    emsoff,emsbase,offset;\r
 920 \r
 921         emsoff = page & (PMEMSSubPage - 1);\r
 922         emsbase = page - emsoff;\r
 923 \r
 924         emspage = -1;\r
 925         // See if this page is already mapped in\r
 926         for (i = 0;i < EMSFrameCount;i++)\r
 927         {\r
 928                 if (gvar->pm.emm.EMSList[i].baseEMSPage == emsbase)\r
 929                 {\r
 930                         emspage = i;    // Yep - don't do a redundant remapping\r
 931                         break;\r
 932                 }\r
 933         }\r
 934 \r
 935         // If page isn't already mapped in, find LRU EMS frame, and use it\r
 936         if (emspage == -1)\r
 937         {\r
 938                 dword last = LONG_MAX;\r
 939                 for (i = 0;i < EMSFrameCount;i++)\r
 940                 {\r
 941                         if (gvar->pm.emm.EMSList[i].lastHit < last)\r
 942                         {\r
 943                                 emspage = i;\r
 944                                 last = gvar->pm.emm.EMSList[i].lastHit;\r
 945                         }\r
 946                 }\r
 947 \r
 948                 gvar->pm.emm.EMSList[emspage].baseEMSPage = emsbase;\r
 949                 PML_MapEMS(page / PMEMSSubPage,emspage, gvar);\r
 950         }\r
 951 \r
 952         if (emspage == -1)\r
 953                 Quit("PML_GetEMSAddress: EMS find failed");\r
 954 \r
 955         gvar->pm.emm.EMSList[emspage].lastHit = gvar->pm.PMFrameCount;\r
 956         offset = emspage * EMSPageSizeSeg;\r
 957         offset += emsoff * PMPageSizeSeg;\r
 958         return((memptr)(gvar->pm.emm.EMSPageFrame + offset));\r
 959 }\r
 960 #else\r
 961 memptr\r
 962 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)\r
 963 {\r
 964         word    emspage;\r
 965 \r
 966         emspage = (lock < pml_EMSLock)? 3 : (lock - pml_EMSLock);\r
 967 \r
 968         PML_MapEMS(page / PMEMSSubPage,emspage);\r
 969 \r
 970         return((memptr)(EMSPageFrame + (emspage * EMSPageSizeSeg)\r
 971                         + ((page & (PMEMSSubPage - 1)) * PMPageSizeSeg)));\r
 972 }\r
 973 #endif\r
 974 \r
 975 //\r
 976 //      PM_GetPageAddress() - Returns the address of a given page\r
 977 //              Maps in EMS if necessary\r
 978 //              Returns nil if block isn't cached into Main Memory or EMS\r
 979 //\r
 980 //\r
 981 memptr\r
 982 PM_GetPageAddress(int pagenum, global_game_variables_t *gvar)\r
 983 {\r
 984         PageListStruct  far *page;\r
 985 \r
 986         page = &gvar->pm.PMPages[pagenum];\r
 987         if (page->mainPage != -1)\r
 988                 return(gvar->pm.mm.MainMemPages[page->mainPage]);\r
 989         else if (page->emsPage != -1)\r
 990                 return(PML_GetEMSAddress(page->emsPage,page->locked, gvar));\r
 991         else\r
 992                 return(nil);\r
 993 }\r
 994 \r
 995 //\r
 996 //      PML_GiveLRUPage() - Returns the page # of the least recently used\r
 997 //              present & unlocked main/EMS page (or main page if mainonly is true)\r
 998 //\r
 999 int\r
1000 PML_GiveLRUPage(boolean mainonly, global_game_variables_t *gvar)\r
1001 {\r
1002         int                             i,lru;\r
1003         long                    last;\r
1004         PageListStruct  far *page;\r
1005 \r
1006         for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
1007         {\r
1008                 if\r
1009                 (\r
1010                         (page->lastHit < last)\r
1011                 &&      ((page->emsPage != -1) || (page->mainPage != -1))\r
1012                 &&      (page->locked == pml_Unlocked)\r
1013                 &&      (!(mainonly && (page->mainPage == -1)))\r
1014                 )\r
1015                 {\r
1016                         last = page->lastHit;\r
1017                         lru = i;\r
1018                 }\r
1019         }\r
1020 \r
1021         if (lru == -1)\r
1022                 Quit("PML_GiveLRUPage: LRU Search failed");\r
1023         return(lru);\r
1024 }\r
1025 \r
1026 //\r
1027 //      PML_GiveLRUXMSPage() - Returns the page # of the least recently used\r
1028 //              (and present) XMS page.\r
1029 //      This routine won't return the XMS page protected (by XMSProtectPage)\r
1030 //\r
1031 int\r
1032 PML_GiveLRUXMSPage(global_game_variables_t *gvar)\r
1033 {\r
1034         int                             i,lru;\r
1035         long                    last;\r
1036         PageListStruct  far *page;\r
1037 \r
1038         for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
1039         {\r
1040                 if\r
1041                 (\r
1042                         (page->xmsPage != -1)\r
1043                 &&      (page->lastHit < last)\r
1044                 &&      (i != gvar->pm.xmm.XMSProtectPage)\r
1045                 )\r
1046                 {\r
1047                         last = page->lastHit;\r
1048                         lru = i;\r
1049                 }\r
1050         }\r
1051         return(lru);\r
1052 }\r
1053 \r
1054 //\r
1055 //      PML_PutPageInXMS() - If page isn't in XMS, find LRU XMS page and replace\r
1056 //              it with the main/EMS page\r
1057 //\r
1058 void\r
1059 PML_PutPageInXMS(int pagenum, global_game_variables_t *gvar)\r
1060 {\r
1061         int                             usexms;\r
1062         PageListStruct  far *page;\r
1063 \r
1064         if (!gvar->pm.xmm.XMSPresent)\r
1065                 return;\r
1066 \r
1067         page = &gvar->pm.PMPages[pagenum];\r
1068         if (page->xmsPage != -1)\r
1069                 return;                                 // Already in XMS\r
1070 \r
1071         if (gvar->pm.XMSPagesUsed < gvar->pm.xmm.XMSPagesAvail)\r
1072                 page->xmsPage = gvar->pm.XMSPagesUsed++;\r
1073         else\r
1074         {\r
1075                 usexms = PML_GiveLRUXMSPage(gvar);\r
1076                 if (usexms == -1)\r
1077                         Quit("PML_PutPageInXMS: No XMS LRU");\r
1078                 page->xmsPage = gvar->pm.PMPages[usexms].xmsPage;\r
1079                 gvar->pm.PMPages[usexms].xmsPage = -1;\r
1080         }\r
1081         PML_CopyToXMS(PM_GetPageAddress(pagenum, gvar),page->xmsPage,page->length, gvar);\r
1082 }\r
1083 \r
1084 //\r
1085 //      PML_TransferPageSpace() - A page is being replaced, so give the new page\r
1086 //              the old one's address space. Returns the address of the new page.\r
1087 //\r
1088 memptr\r
1089 PML_TransferPageSpace(int orig,int new, global_game_variables_t *gvar)\r
1090 {\r
1091         memptr                  addr;\r
1092         PageListStruct  far *origpage,far *newpage;\r
1093 \r
1094         if (orig == new)\r
1095                 Quit("PML_TransferPageSpace: Identity replacement");\r
1096 \r
1097         origpage = &gvar->pm.PMPages[orig];\r
1098         newpage = &gvar->pm.PMPages[new];\r
1099 \r
1100         if (origpage->locked != pml_Unlocked)\r
1101                 Quit("PML_TransferPageSpace: Killing locked page");\r
1102 \r
1103         if ((origpage->emsPage == -1) && (origpage->mainPage == -1))\r
1104                 Quit("PML_TransferPageSpace: Reusing non-existent page");\r
1105 \r
1106         // Copy page that's about to be purged into XMS\r
1107         PML_PutPageInXMS(orig, gvar);\r
1108 \r
1109         // Get the address, and force EMS into a physical page if necessary\r
1110         addr = PM_GetPageAddress(orig, gvar);\r
1111 \r
1112         // Steal the address\r
1113         newpage->emsPage = origpage->emsPage;\r
1114         newpage->mainPage = origpage->mainPage;\r
1115 \r
1116         // Mark replaced page as purged\r
1117         origpage->mainPage = origpage->emsPage = -1;\r
1118 \r
1119         if (!addr)\r
1120                 Quit("PML_TransferPageSpace: Zero replacement");\r
1121 \r
1122         return(addr);\r
1123 }\r
1124 \r
1125 //\r
1126 //      PML_GetAPageBuffer() - A page buffer is needed. Either get it from the\r
1127 //              main/EMS free pool, or use PML_GiveLRUPage() to find which page to\r
1128 //              steal the buffer from. Returns a far pointer to the page buffer, and\r
1129 //              sets the fields inside the given page structure appropriately.\r
1130 //              If mainonly is true, free EMS will be ignored, and only main pages\r
1131 //              will be looked at by PML_GiveLRUPage().\r
1132 //\r
1133 byte far *\r
1134 PML_GetAPageBuffer(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
1135 {\r
1136         byte                    far *addr = nil;\r
1137         int                             i,n;\r
1138         PMBlockAttr             *used;\r
1139         PageListStruct  far *page;\r
1140 \r
1141         page = &gvar->pm.PMPages[pagenum];\r
1142         if ((gvar->pm.EMSPagesUsed < gvar->pm.emm.EMSPagesAvail) && !mainonly)\r
1143         {\r
1144                 // There's remaining EMS - use it\r
1145                 page->emsPage = gvar->pm.EMSPagesUsed++;\r
1146                 addr = PML_GetEMSAddress(page->emsPage,page->locked, gvar);\r
1147         }\r
1148         else if (gvar->pm.MainPagesUsed < gvar->pm.mm.MainPagesAvail)\r
1149         {\r
1150                 // There's remaining main memory - use it\r
1151                 for (i = 0,n = -1,used = gvar->pm.mm.MainMemUsed;i < PMMaxMainMem;i++,used++)\r
1152                 {\r
1153                         if ((*used & pmba_Allocated) && !(*used & pmba_Used))\r
1154                         {\r
1155                                 n = i;\r
1156                                 *used |= pmba_Used;\r
1157                                 break;\r
1158                         }\r
1159                 }\r
1160                 if (n == -1)\r
1161                         Quit("PML_GetPageBuffer: MainPagesAvail lied");\r
1162                 addr = gvar->pm.mm.MainMemPages[n];\r
1163                 if (!addr)\r
1164                         Quit("PML_GetPageBuffer: Purged main block");\r
1165                 page->mainPage = n;\r
1166                 gvar->pm.MainPagesUsed++;\r
1167         }\r
1168         else\r
1169                 addr = PML_TransferPageSpace(PML_GiveLRUPage(mainonly, gvar),pagenum, gvar);\r
1170 \r
1171         if (!addr)\r
1172                 Quit("PML_GetPageBuffer: Search failed");\r
1173         return(addr);\r
1174 }\r
1175 \r
1176 //\r
1177 //      PML_GetPageFromXMS() - If page is in XMS, find LRU main/EMS page and\r
1178 //              replace it with the page from XMS. If mainonly is true, will only\r
1179 //              search for LRU main page.\r
1180 //      XMSProtectPage is set to the page to be retrieved from XMS, so that if\r
1181 //              the page from which we're stealing the main/EMS from isn't in XMS,\r
1182 //              it won't copy over the page that we're trying to get from XMS.\r
1183 //              (pages that are being purged are copied into XMS, if possible)\r
1184 //\r
1185 memptr\r
1186 PML_GetPageFromXMS(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
1187 {\r
1188         byte                    far *checkaddr;\r
1189         memptr                  addr = nil;\r
1190         PageListStruct  far *page;\r
1191 \r
1192         page = &gvar->pm.PMPages[pagenum];\r
1193         if (gvar->pm.xmm.XMSPresent && (page->xmsPage != -1))\r
1194         {\r
1195                 gvar->pm.xmm.XMSProtectPage = pagenum;\r
1196                 checkaddr = PML_GetAPageBuffer(pagenum,mainonly, gvar);\r
1197                 if (FP_OFF(checkaddr))\r
1198                         Quit("PML_GetPageFromXMS: Non segment pointer");\r
1199                 addr = (memptr)FP_SEG(checkaddr);\r
1200                 PML_CopyFromXMS(addr,page->xmsPage,page->length, gvar);\r
1201                 gvar->pm.xmm.XMSProtectPage = -1;\r
1202         }\r
1203 \r
1204         return(addr);\r
1205 }\r
1206 \r
1207 //\r
1208 //      PML_LoadPage() - A page is not in main/EMS memory, and it's not in XMS.\r
1209 //              Load it into either main or EMS. If mainonly is true, the page will\r
1210 //              only be loaded into main.\r
1211 //\r
1212 void\r
1213 PML_LoadPage(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
1214 {\r
1215         byte                    far *addr;\r
1216         PageListStruct  far *page;\r
1217 \r
1218         addr = PML_GetAPageBuffer(pagenum,mainonly, gvar);\r
1219         page = &gvar->pm.PMPages[pagenum];\r
1220         PML_ReadFromFile(addr,page->offset,page->length, gvar);\r
1221 }\r
1222 \r
1223 //\r
1224 //      PM_GetPage() - Returns the address of the page, loading it if necessary\r
1225 //              First, check if in Main Memory or EMS\r
1226 //              Then, check XMS\r
1227 //              If not in XMS, load into Main Memory or EMS\r
1228 //\r
1229 #pragma warn -pia\r
1230 memptr\r
1231 PM_GetPage(int pagenum, global_game_variables_t *gvar)\r
1232 {\r
1233         memptr  result;\r
1234 \r
1235         if (pagenum >= gvar->pm.fi.ChunksInFile)\r
1236                 Quit("PM_GetPage: Invalid page request");\r
1237 \r
1238 #ifdef __DEBUG_2__      // for debugging\r
1239         __asm {\r
1240                 mov     dx,STATUS_REGISTER_1\r
1241                 in      al,dx\r
1242                 mov     dx,ATR_INDEX\r
1243                 mov     al,ATR_OVERSCAN\r
1244                 out     dx,al\r
1245                 mov     al,10   // bright green\r
1246                 out     dx,al\r
1247         }\r
1248 #endif\r
1249 \r
1250         if (!(result = PM_GetPageAddress(pagenum, gvar)))\r
1251         {\r
1252                 boolean mainonly = (pagenum >= gvar->pm.fi.PMSoundStart);\r
1253 if (!gvar->pm.PMPages[pagenum].offset)  // JDC: sparse page\r
1254         Quit ("Tried to load a sparse page!");\r
1255                 if (!(result = PML_GetPageFromXMS(pagenum,mainonly, gvar)))\r
1256                 {\r
1257                         if (gvar->pm.PMPages[pagenum].lastHit ==  gvar->pm.PMFrameCount)\r
1258                                 gvar->pm.PMThrashing++;\r
1259 \r
1260                         PML_LoadPage(pagenum,mainonly, gvar);\r
1261                         result = PM_GetPageAddress(pagenum, gvar);\r
1262                 }\r
1263         }\r
1264         gvar->pm.PMPages[pagenum].lastHit =  gvar->pm.PMFrameCount;\r
1265 \r
1266 #ifdef __DEBUG_2__      // for debugging\r
1267         __asm{\r
1268                 mov     dx,STATUS_REGISTER_1\r
1269                 in      al,dx\r
1270                 mov     dx,ATR_INDEX\r
1271                 mov     al,ATR_OVERSCAN\r
1272                 out     dx,al\r
1273                 mov     al,3    // blue\r
1274                 out     dx,al\r
1275                 mov     al,0x20 // normal\r
1276                 out     dx,al\r
1277 #endif\r
1278 \r
1279         return(result);\r
1280 }\r
1281 #pragma warn +pia\r
1282 \r
1283 //\r
1284 //      PM_SetPageLock() - Sets the lock type on a given page\r
1285 //              pml_Unlocked: Normal, page can be purged\r
1286 //              pml_Locked: Cannot be purged\r
1287 //              pml_EMS?: Same as pml_Locked, but if in EMS, use the physical page\r
1288 //                                      specified when returning the address. For sound stuff.\r
1289 //\r
1290 void\r
1291 PM_SetPageLock(int pagenum,PMLockType lock, global_game_variables_t *gvar)\r
1292 {\r
1293         if (pagenum < gvar->pm.fi.PMSoundStart)\r
1294                 Quit("PM_SetPageLock: Locking/unlocking non-sound page");\r
1295 \r
1296         gvar->pm.PMPages[pagenum].locked = lock;\r
1297 }\r
1298 \r
1299 //\r
1300 //      PM_Preload() - Loads as many pages as possible into all types of memory.\r
1301 //              Calls the update function after each load, indicating the current\r
1302 //              page, and the total pages that need to be loaded (for thermometer).\r
1303 //\r
1304 void\r
1305 PM_Preload(boolean (*update)(word current,word total), global_game_variables_t *gvar)\r
1306 {\r
1307         int                             i,j,\r
1308                                         page,oogypage;\r
1309         word                    current,total,\r
1310                                         totalnonxms,totalxms,\r
1311                                         mainfree,maintotal,\r
1312                                         emsfree,emstotal,\r
1313                                         xmsfree,xmstotal;\r
1314         memptr                  addr;\r
1315         PageListStruct  far *p;\r
1316 \r
1317         mainfree = (gvar->pm.mm.MainPagesAvail - gvar->pm.MainPagesUsed) + (gvar->pm.emm.EMSPagesAvail - gvar->pm.EMSPagesUsed);\r
1318         xmsfree = (gvar->pm.xmm.XMSPagesAvail - gvar->pm.XMSPagesUsed);\r
1319 \r
1320         xmstotal = maintotal = 0;\r
1321 \r
1322         for (i = 0;i < gvar->pm.fi.ChunksInFile;i++)\r
1323         {\r
1324                 if (!gvar->pm.PMPages[i].offset)\r
1325                         continue;                       // sparse\r
1326 \r
1327                 if ( gvar->pm.PMPages[i].emsPage != -1 || gvar->pm.PMPages[i].mainPage != -1 )\r
1328                         continue;                       // already in main mem\r
1329 \r
1330                 if ( mainfree )\r
1331                 {\r
1332                         maintotal++;\r
1333                         mainfree--;\r
1334                 }\r
1335                 else if ( xmsfree && (gvar->pm.PMPages[i].xmsPage == -1) )\r
1336                 {\r
1337                         xmstotal++;\r
1338                         xmsfree--;\r
1339                 }\r
1340         }\r
1341 \r
1342 \r
1343         total = maintotal + xmstotal;\r
1344 \r
1345         if (!total)\r
1346                 return;\r
1347 \r
1348         page = 0;\r
1349         current = 0;\r
1350 \r
1351 //\r
1352 // cache main/ems blocks\r
1353 //\r
1354         while (maintotal)\r
1355         {\r
1356                 while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].mainPage != -1\r
1357                         ||      gvar->pm.PMPages[page].emsPage != -1 )\r
1358                         page++;\r
1359 \r
1360                 if (page >= gvar->pm.fi.ChunksInFile)\r
1361                         Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");\r
1362 \r
1363                 PM_GetPage(page, gvar);\r
1364 \r
1365                 page++;\r
1366                 current++;\r
1367                 maintotal--;\r
1368                 update(current,total);\r
1369         }\r
1370 \r
1371 //\r
1372 // load stuff to XMS\r
1373 //\r
1374         if (xmstotal)\r
1375         {\r
1376                 for (oogypage = 0 ; gvar->pm.PMPages[oogypage].mainPage == -1 ; oogypage++)\r
1377                 ;\r
1378                 addr = PM_GetPage(oogypage, gvar);\r
1379                 if (!addr)\r
1380                         Quit("PM_Preload: XMS buffer failed");\r
1381 \r
1382                 while (xmstotal)\r
1383                 {\r
1384                         while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].xmsPage != -1 )\r
1385                                 page++;\r
1386 \r
1387                         if (page >= gvar->pm.fi.ChunksInFile)\r
1388                                 Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");\r
1389 \r
1390                         p = &gvar->pm.PMPages[page];\r
1391 \r
1392                         p->xmsPage = gvar->pm.XMSPagesUsed++;\r
1393                         if (gvar->pm.XMSPagesUsed > gvar->pm.xmm.XMSPagesAvail)\r
1394                                 Quit("PM_Preload: Exceeded XMS pages");\r
1395                         if (p->length > PMPageSize)\r
1396                                 Quit("PM_Preload: Page too long");\r
1397 \r
1398                         PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);\r
1399                         PML_CopyToXMS((byte far *)addr,p->xmsPage,p->length, gvar);\r
1400 \r
1401                         page++;\r
1402                         current++;\r
1403                         xmstotal--;\r
1404                         update(current,total);\r
1405                 }\r
1406 \r
1407                 p = &gvar->pm.PMPages[oogypage];\r
1408                 PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);\r
1409         }\r
1410 \r
1411         update(total,total);\r
1412 }\r
1413 \r
1414 /////////////////////////////////////////////////////////////////////////////\r
1415 //\r
1416 //      General code\r
1417 //\r
1418 /////////////////////////////////////////////////////////////////////////////\r
1419 \r
1420 //\r
1421 //      PM_NextFrame() - Increments the frame counter and adjusts the thrash\r
1422 //              avoidence variables\r
1423 //\r
1424 //              If currently in panic mode (to avoid thrashing), check to see if the\r
1425 //                      appropriate number of frames have passed since the last time that\r
1426 //                      we would have thrashed. If so, take us out of panic mode.\r
1427 //\r
1428 //\r
1429 void\r
1430 PM_NextFrame(global_game_variables_t *gvar)\r
1431 {\r
1432         int     i;\r
1433 \r
1434         // Frame count overrun - kill the LRU hit entries & reset frame count\r
1435         if (++gvar->pm.PMFrameCount >= LONG_MAX - 4)\r
1436         {\r
1437                 for (i = 0;i < gvar->pm.PMNumBlocks;i++)\r
1438                         gvar->pm.PMPages[i].lastHit = 0;\r
1439                 gvar->pm.PMFrameCount = 0;\r
1440         }\r
1441 \r
1442 //#if 0\r
1443         for (i = 0;i < gvar->pm.fi.PMSoundStart;i++)\r
1444         {\r
1445                 if (gvar->pm.PMPages[i].locked)\r
1446                 {\r
1447                         char buf[40];\r
1448                         sprintf(buf,"PM_NextFrame: Page %d is locked",i);\r
1449                         Quit(buf);\r
1450                 }\r
1451         }\r
1452 //#endif\r
1453 \r
1454         if (gvar->pm.PMPanicMode)\r
1455         {\r
1456                 // DEBUG - set border color\r
1457                 if ((!gvar->pm.PMThrashing) && (!--gvar->pm.PMPanicMode))\r
1458                 {\r
1459                         // DEBUG - reset border color\r
1460                 }\r
1461         }\r
1462         if (gvar->pm.PMThrashing >= PMThrashThreshold)\r
1463                 gvar->pm.PMPanicMode = PMUnThrashThreshold;\r
1464         gvar->pm.PMThrashing = false;\r
1465 }\r
1466 \r
1467 //\r
1468 //      PM_Reset() - Sets up caching structures\r
1469 //\r
1470 void\r
1471 PM_Reset(global_game_variables_t *gvar)\r
1472 {\r
1473         int                             i;\r
1474         PageListStruct  far *page;\r
1475 \r
1476         gvar->pm.xmm.XMSPagesAvail = gvar->pm.xmm.XMSAvail / PMPageSizeKB;\r
1477 \r
1478         gvar->pm.emm.EMSPagesAvail = gvar->pm.emm.EMSAvail * (EMSPageSizeKB / PMPageSizeKB);\r
1479         gvar->pm.emm.EMSPhysicalPage = 0;\r
1480 \r
1481         gvar->pm.MainPagesUsed = gvar->pm.EMSPagesUsed = gvar->pm.XMSPagesUsed = 0;\r
1482 \r
1483         gvar->pm.PMPanicMode = false;\r
1484 \r
1485         gvar->pm.fi.PageFile = -1;\r
1486         gvar->pm.xmm.XMSProtectPage = -1;\r
1487 \r
1488         // Initialize page list\r
1489         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.PMNumBlocks;i++,page++)\r
1490         {\r
1491                 page->mainPage = -1;\r
1492                 page->emsPage = -1;\r
1493                 page->xmsPage = -1;\r
1494                 page->locked = false;\r
1495         }\r
1496 }\r
1497 \r
1498 //\r
1499 //      PM_Startup() - Start up the Page Mgr\r
1500 //\r
1501 void\r
1502 PM_Startup(global_game_variables_t *gvar)\r
1503 {\r
1504         boolean nomain,noems,noxms;\r
1505         int             i;\r
1506 \r
1507         if (gvar->pm.PMStarted)\r
1508                 return;\r
1509 \r
1510         //strcpy(&(gvar->pm.fi.PageFileName), "VSWAP.");\r
1511 \r
1512         nomain = noems = noxms = false;\r
1513         for (i = 1;i <\r
1514 #ifdef __WATCOMC__\r
1515         __argc\r
1516 #endif\r
1517 #ifdef __BORLANDC__\r
1518         _argc\r
1519 #endif\r
1520         ;i++)\r
1521         {\r
1522                 switch (US_CheckParm(\r
1523 #ifdef __WATCOMC__\r
1524         __argv[i]\r
1525 #endif\r
1526 #ifdef __BORLANDC__\r
1527         _argv[i]\r
1528 #endif\r
1529                 ,ParmStrings))\r
1530                 {\r
1531                 case 0:\r
1532                         nomain = true;\r
1533                         break;\r
1534                 case 1:\r
1535                         noems = true;\r
1536                         break;\r
1537                 case 2:\r
1538                         noxms = true;\r
1539                         break;\r
1540                 }\r
1541         }\r
1542 \r
1543         //0000+=+=PML_OpenPageFile(gvar);\r
1544 \r
1545         if (!noems && MML_CheckForEMS())\r
1546                 PML_StartupEMS(gvar);\r
1547         if (!noxms && MML_CheckForXMS())\r
1548                 PML_StartupXMS(gvar);\r
1549 \r
1550         if (!nomain && !gvar->pm.emm.EMSPresent)\r
1551         {\r
1552                 printf("PM_Startup: No main or EMS\n");\r
1553                 exit(-5);\r
1554                 //return;\r
1555         }\r
1556         PML_StartupMainMem(gvar);\r
1557 \r
1558         PM_Reset(gvar);\r
1559 \r
1560         gvar->pm.PMStarted = true;\r
1561 }\r
1562 \r
1563 //\r
1564 //      PM_Shutdown() - Shut down the Page Mgr\r
1565 //\r
1566 void\r
1567 PM_Shutdown(global_game_variables_t *gvar)\r
1568 {\r
1569         if(MML_CheckForXMS()) PML_ShutdownXMS(gvar);\r
1570         if(MML_CheckForEMS()) PML_ShutdownEMS(gvar);\r
1571 \r
1572         if (!gvar->pm.PMStarted)\r
1573                 return;\r
1574 \r
1575         PML_ClosePageFile(gvar);\r
1576 \r
1577         PML_ShutdownMainMem(gvar);\r
1578 }\r