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