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