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         word XMSAvail, XMSHandle;\r
 360 #define XMSAVI  XMSAvail\r
 361 #define XMSHAN XMSHandle\r
 362 //++++  word XMSVer;\r
 363         boolean errorflag=false;\r
 364         word e=0;\r
 365         gvar->pm.xmm.XMSPresent = false;                                        // Assume failure\r
 366         XMSAVI = gvar->mmi.XMSmem = 0;\r
 367 \r
 368         __asm {\r
 369                 mov     ax,0x4300\r
 370                 int     XMS_INT                                         // Check for presence of XMS driver\r
 371                 cmp     al,0x80\r
 372                 jne     error1\r
 373                 mov     e,1\r
 374 \r
 375                 mov     ax,0x4310\r
 376                 int     XMS_INT                                                 // Get address of XMS driver\r
 377                 mov     [WORD PTR XMSDriver],bx\r
 378                 mov     [WORD PTR XMSDriver+2],es               // function pointer to XMS driver\r
 379 //++++          mov     ah,0\r
 380 //++++          call    [DWORD PTR XMSDriver]                                           //; Get XMS Version Number\r
 381 //++++          mov     [XMSVer],ax\r
 382                 mov     e,2\r
 383 \r
 384 #ifdef STARTUPXMSASM\r
 385                 mov     ah,XMS_QUERYFREE                        // Find out how much XMS is available\r
 386                 call    [DWORD PTR XMSDriver]\r
 387                 mov     XMSAVI,ax\r
 388                 cmp     bl,0xa0                         // AJR: bugfix 10/8/92\r
 389                 je      error1\r
 390                 mov     e,3\r
 391 #endif\r
 392                 jmp     End1\r
 393 #ifdef __BORLANDC__\r
 394         }\r
 395 #endif\r
 396         error1:\r
 397 #ifdef __BORLANDC__\r
 398         __asm {\r
 399 #endif\r
 400                 mov     err,bl\r
 401                 mov     errorflag,1\r
 402                 jmp End1\r
 403 #ifdef __BORLANDC__\r
 404         }\r
 405 #endif\r
 406 End1:\r
 407 #ifdef __WATCOMC__\r
 408         }\r
 409 #endif\r
 410         if(errorflag==true) goto error;\r
 411 #ifndef STARTUPXMSASM\r
 412         XMS_CALL(XMS_QUERYFREE);                        // Find out how much XMS is available\r
 413         XMSAVI = _AX;\r
 414         if (_BL)                                // AJR: bugfix 10/8/92\r
 415         {\r
 416                 errorflag = true;\r
 417                 err = _BL;\r
 418                 goto error;\r
 419         }\r
 420         e++;\r
 421 #endif\r
 422 \r
 423 #ifdef __DEBUG_PM__\r
 424 //++++  printf("XMSVer=%02X     ", XMSVer);\r
 425         printf("XMSAvail=%u\n", (XMSAVI));\r
 426         getch();\r
 427 #endif\r
 428         XMSAVI &= ~(PMPageSizeKB - 1);  // Round off to nearest page size\r
 429         if (XMSAVI < (PMPageSizeKB * 2))        // Need at least 2 pages\r
 430         {\r
 431                 errorflag=true;\r
 432                 goto error;\r
 433         }\r
 434 #ifdef STARTUPXMSASM\r
 435         __asm {\r
 436                 mov     dx,XMSAVI\r
 437                 mov     ah,XMS_ALLOC                            // And do the allocation\r
 438                 call    [DWORD PTR XMSDriver]\r
 439 #ifndef BRACKETXMS\r
 440                 mov     XMSHAN,dx\r
 441 #else\r
 442                 mov     [XMSHAN],dx\r
 443 #endif\r
 444                 cmp     ax,0                            // AJR: bugfix 10/8/92\r
 445                 je      error2\r
 446                 mov     e,4\r
 447                 jmp     End2\r
 448 #ifdef __BORLANDC__\r
 449         }\r
 450 #endif\r
 451         error2:\r
 452 #ifdef __BORLANDC__\r
 453         __asm {\r
 454 #endif\r
 455                 mov     err,bl\r
 456                 mov     errorflag,1\r
 457                 jmp End2\r
 458 #ifdef __BORLANDC__\r
 459         }\r
 460 #endif\r
 461 End2:\r
 462 #ifdef __WATCOMC__\r
 463         }\r
 464 #endif\r
 465 #else\r
 466         _DX = XMSAVI;\r
 467         XMS_CALL(XMS_ALLOC);                            // And do the allocation\r
 468         XMSHAN = _DX;\r
 469         if (!_AX)                               // AJR: bugfix 10/8/92\r
 470         {\r
 471                 errorflag=true;\r
 472                 err = _BL;\r
 473                 goto error;\r
 474         }\r
 475         e++;\r
 476 #endif\r
 477 error:\r
 478         if(errorflag==false)\r
 479         {\r
 480                 gvar->mmi.XMSmem = (XMSAVI) * 1024ul;\r
 481                 gvar->pm.xmm.XMSAvail = (word)XMSAVI;\r
 482                 gvar->pm.xmm.XMSHandle = XMSHAN;\r
 483 //++++          gvar->pm.xmm.XMSVer = XMSVer;\r
 484                 gvar->pm.xmm.XMSPresent = true;\r
 485 #ifdef __DEBUG_PM__\r
 486                 printf("        XMSmem=%lu      XMSAvail=%u\n", gvar->mmi.XMSmem, XMSAVI);\r
 487 #endif\r
 488         }\r
 489         else\r
 490         {\r
 491 #ifdef __DEBUG_PM__\r
 492                 //printf("XMSHandle\n");\r
 493                 //printf("      1=%u    2=%u    3=%u    4=%u\n", XMSHandle1, XMSHandle2, XMSHandle3, XMSHandle4);\r
 494                 //printf("      2=%u    ", XMSHandle);\r
 495                 //printf("      %u", gvar->pm.xmm.XMSHandle);\r
 496                 printf("XMSerr\n");\r
 497                 printf("        %u,     %lu\n", (word)XMSAVI, (dword)XMSAVI);\r
 498                 printf("        err=%02X        e=%u\n", err, e);\r
 499                 getch();\r
 500 #endif\r
 501         }\r
 502         return(gvar->pm.xmm.XMSPresent);\r
 503 }\r
 504 \r
 505 //\r
 506 //      PML_XMSCopy() - Copies a main/EMS page to or from XMS\r
 507 //              Will round an odd-length request up to the next even value\r
 508 //\r
 509 void\r
 510 PML_XMSCopy(boolean toxms,byte far *addr,word xmspage,word length, global_game_variables_t *gvar)\r
 511 {\r
 512         dword   xoffset;\r
 513         struct\r
 514         {\r
 515                 dword   length;\r
 516                 word            source_handle;\r
 517                 dword   source_offset;\r
 518                 word            target_handle;\r
 519                 dword   target_offset;\r
 520         } copy;\r
 521 \r
 522         if (!addr)\r
 523         {\r
 524                 Quit("PML_XMSCopy: zero address\n");\r
 525                 //return;\r
 526         }\r
 527 \r
 528         xoffset = (dword)xmspage * PMPageSize;\r
 529 \r
 530         copy.length = (length + 1) & ~1;\r
 531         copy.source_handle = toxms? 0 : gvar->pm.xmm.XMSHandle;\r
 532         copy.source_offset = toxms? (long)addr : xoffset;\r
 533         copy.target_handle = toxms? gvar->pm.xmm.XMSHandle : 0;\r
 534         copy.target_offset = toxms? xoffset : (long)addr;\r
 535 \r
 536         __asm {\r
 537                 push si\r
 538         }\r
 539         _SI = (word)&copy;\r
 540         XMS_CALL(XMS_MOVE);\r
 541         __asm {\r
 542                 pop     si\r
 543         }\r
 544         if (!_AX)\r
 545         {\r
 546                 Quit("PML_XMSCopy: Error on copy");\r
 547                 //return;\r
 548         }\r
 549 }\r
 550 \r
 551 #if 1\r
 552 #define PML_CopyToXMS(s,t,l,gvar)       PML_XMSCopy(true,(s),(t),(l),(gvar))\r
 553 #define PML_CopyFromXMS(t,s,l,gvar)     PML_XMSCopy(false,(t),(s),(l),(gvar))\r
 554 #else\r
 555 //\r
 556 //      PML_CopyToXMS() - Copies the specified number of bytes from the real mode\r
 557 //              segment address to the specified XMS page\r
 558 //\r
 559 void\r
 560 PML_CopyToXMS(byte far *source,int targetpage,word length,global_game_variables_t *gvar)\r
 561 {\r
 562         PML_XMSCopy(true,source,targetpage,length, global_game_variables_t *gvar);\r
 563 }\r
 564 \r
 565 //\r
 566 //      PML_CopyFromXMS() - Copies the specified number of bytes from an XMS\r
 567 //              page to the specified real mode address\r
 568 //\r
 569 void\r
 570 PML_CopyFromXMS(byte far *target,int sourcepage,word length, global_game_variables_t *gvar)\r
 571 {\r
 572         PML_XMSCopy(false,target,sourcepage,length, global_game_variables_t *gvar);\r
 573 }\r
 574 #endif\r
 575 \r
 576 //\r
 577 //      PML_ShutdownXMS()\r
 578 //\r
 579 void\r
 580 PML_ShutdownXMS(global_game_variables_t *gvar)\r
 581 {\r
 582         boolean errorflag=false;\r
 583         word XMSHandle = gvar->pm.xmm.XMSHandle;\r
 584         if (gvar->pm.xmm.XMSPresent)\r
 585         {\r
 586                 __asm {\r
 587                         mov     dx,[XMSHandle]\r
 588                         //XMS_CALL(XMS_FREE);\r
 589                         mov     ah,XMS_FREE\r
 590                         call    [DWORD PTR XMSDriver]\r
 591                         or      bl,bl\r
 592                         jz      errorxs\r
 593                         jmp     Endxs\r
 594 #ifdef __BORLANDC__\r
 595                 }\r
 596 #endif\r
 597                         errorxs:\r
 598 #ifdef __BORLANDC__\r
 599                 __asm {\r
 600 #endif\r
 601                         //mov   err,ah\r
 602                         mov     errorflag,1\r
 603                         jmp     Endxs\r
 604 #ifdef __BORLANDC__\r
 605                 }\r
 606 #endif\r
 607                         Endxs:\r
 608 #ifdef __WATCOMC__\r
 609                 }\r
 610 #endif\r
 611                 if(errorflag==true)\r
 612                 {\r
 613                         Quit("PML_ShutdownXMS: Error freeing XMS");\r
 614                         //return;\r
 615                 }\r
 616         }\r
 617 }\r
 618 \r
 619 /////////////////////////////////////////////////////////////////////////////\r
 620 //\r
 621 //      Main memory code\r
 622 //\r
 623 /////////////////////////////////////////////////////////////////////////////\r
 624 \r
 625 //\r
 626 //      PM_SetMainMemPurge() - Sets the purge level for all allocated main memory\r
 627 //              blocks. This shouldn't be called directly - the PM_LockMainMem() and\r
 628 //              PM_UnlockMainMem() macros should be used instead.\r
 629 //\r
 630 void\r
 631 PM_SetMainMemPurge(int level, global_game_variables_t *gvar)\r
 632 {\r
 633         int     i;\r
 634 \r
 635         if(gvar->pm.mm.MainPresent)\r
 636         for (i = 0;i < PMMaxMainMem;i++)\r
 637         {\r
 638 #ifdef __DEBUG_PM__\r
 639                 printf("PM_SetMainMemPurge()    info of gvar->pm.mm.MainMemPages[i]\n");\r
 640                 printf("&       %Fp,    %Fp\n", &gvar->pm.mm.MainMemPages[i],   &(gvar->pm.mm.MainMemPages[i]));\r
 641 #endif\r
 642                 if (gvar->pm.mm.MainMemPages[i])\r
 643                         MM_SetPurge(&(gvar->pm.mm.MainMemPages[i]),level, gvar);\r
 644         }\r
 645 \r
 646         else\r
 647         {\r
 648                 Quit("MainPresent IS NULL\n");\r
 649         }\r
 650 }\r
 651 \r
 652 //\r
 653 //      PM_CheckMainMem() - If something besides the Page Mgr makes requests of\r
 654 //              the Memory Mgr, some of the Page Mgr's blocks may have been purged,\r
 655 //              so this function runs through the block list and checks to see if\r
 656 //              any of the blocks have been purged. If so, it marks the corresponding\r
 657 //              page as purged & unlocked, then goes through the block list and\r
 658 //              tries to reallocate any blocks that have been purged.\r
 659 //      This routine now calls PM_LockMainMem() to make sure that any allocation\r
 660 //              attempts made during the block reallocation sweep don't purge any\r
 661 //              of the other blocks. Because PM_LockMainMem() is called,\r
 662 //              PM_UnlockMainMem() needs to be called before any other part of the\r
 663 //              program makes allocation requests of the Memory Mgr.\r
 664 //\r
 665 void\r
 666 PM_CheckMainMem(global_game_variables_t *gvar)\r
 667 {\r
 668         boolean                 allocfailed;\r
 669         int                             i,n;\r
 670         memptr                  *p;\r
 671         PMBlockAttr             *used;\r
 672         PageListStruct  far *page;\r
 673 \r
 674         if (!gvar->pm.mm.MainPresent)\r
 675                 return;\r
 676 \r
 677         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 678         {\r
 679                 n = page->mainPage;\r
 680                 if (n != -1)                                            // Is the page using main memory?\r
 681                 {\r
 682                         if (!gvar->pm.mm.MainMemPages[n])                       // Yep, was the block purged?\r
 683                         {\r
 684                                 page->mainPage = -1;            // Yes, mark page as purged & unlocked\r
 685                                 page->locked = pml_Unlocked;\r
 686                         }\r
 687                 }\r
 688         }\r
 689 \r
 690         // Prevent allocation attempts from purging any of our other blocks\r
 691         PM_LockMainMem(gvar);\r
 692         allocfailed = false;\r
 693         for (i = 0,p = gvar->pm.mm.MainMemPages,used = gvar->pm.mm.MainMemUsed; i < PMMaxMainMem;i++,p++,used++)\r
 694         {\r
 695                 if (!*p)                                                        // If the page got purged\r
 696                 {\r
 697                         if (*used & pmba_Allocated)             // If it was allocated\r
 698                         {\r
 699                                 *used &= ~pmba_Allocated;       // Mark as unallocated\r
 700                                 gvar->pm.mm.MainPagesAvail--;                   // and decrease available count\r
 701                         }\r
 702 \r
 703                         if (*used & pmba_Used)                  // If it was used\r
 704                         {\r
 705                                 *used &= ~pmba_Used;            // Mark as unused\r
 706                                 gvar->pm.MainPagesUsed--;                       // and decrease used count\r
 707                         }\r
 708 \r
 709                         if (!allocfailed)\r
 710                         {\r
 711                                 MM_BombOnError(false, gvar);\r
 712                                 MM_GetPtr(p,PMPageSize, gvar);          // Try to reallocate\r
 713                                 if (gvar->mm.mmerror)                                   // If it failed,\r
 714                                         allocfailed = true;                     //  don't try any more allocations\r
 715                                 else                                                    // If it worked,\r
 716                                 {\r
 717                                         *used |= pmba_Allocated;        // Mark as allocated\r
 718                                         gvar->pm.mm.MainPagesAvail++;                   // and increase available count\r
 719                                 }\r
 720                                 MM_BombOnError(true, gvar);\r
 721                         }\r
 722                 }\r
 723         }\r
 724         if (gvar->mm.mmerror)\r
 725                 gvar->mm.mmerror = false;\r
 726 }\r
 727 \r
 728 //\r
 729 //      PML_StartupMainMem() - Allocates as much main memory as is possible for\r
 730 //              the Page Mgr. The memory is allocated as non-purgeable, so if it's\r
 731 //              necessary to make requests of the Memory Mgr, PM_UnlockMainMem()\r
 732 //              needs to be called.\r
 733 //\r
 734 void\r
 735 PML_StartupMainMem(global_game_variables_t *gvar)\r
 736 {\r
 737         int             i,n;\r
 738         memptr  *p;\r
 739 \r
 740         gvar->pm.mm.MainPagesAvail = 0;\r
 741         gvar->pm.mm.MainPresent = false;\r
 742         MM_BombOnError(false, gvar);\r
 743         for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)\r
 744         {\r
 745                 MM_GetPtr(p,PMPageSize, gvar);\r
 746                 if (gvar->mm.mmerror)\r
 747                         break;\r
 748 \r
 749                 gvar->pm.mm.MainPagesAvail++;\r
 750                 gvar->pm.mm.MainMemUsed[i] = pmba_Allocated;\r
 751         }\r
 752         MM_BombOnError(true, gvar);\r
 753         if (gvar->mm.mmerror)\r
 754                 gvar->mm.mmerror = false;\r
 755         if (gvar->pm.mm.MainPagesAvail < PMMinMainMem)\r
 756         {\r
 757                 Quit("PM_SetupMainMem: Not enough main memory");\r
 758                 //return;\r
 759         }\r
 760         gvar->pm.mm.MainPresent = true;\r
 761 }\r
 762 \r
 763 //\r
 764 //      PML_ShutdownMainMem() - Frees all of the main memory blocks used by the\r
 765 //              Page Mgr.\r
 766 //\r
 767 void\r
 768 PML_ShutdownMainMem(global_game_variables_t *gvar)\r
 769 {\r
 770         int             i;\r
 771         memptr  *p;\r
 772 \r
 773         // DEBUG - mark pages as unallocated & decrease page count as appropriate\r
 774         for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)\r
 775                 if (*p)\r
 776                         MM_FreePtr(p, gvar);\r
 777 }\r
 778 \r
 779 /////////////////////////////////////////////////////////////////////////////\r
 780 //\r
 781 //      File management code\r
 782 //\r
 783 /////////////////////////////////////////////////////////////////////////////\r
 784 \r
 785 //\r
 786 //      PML_ReadFromFile() - Reads some data in from the page file\r
 787 //\r
 788 void\r
 789 PML_ReadFromFile(byte far *buf,long offset,word length, global_game_variables_t *gvar)\r
 790 {\r
 791         if (!buf)\r
 792         {\r
 793                 Quit("PML_ReadFromFile: Null pointer");\r
 794                 //return;\r
 795         }\r
 796         if (!offset)\r
 797         {\r
 798                 Quit("PML_ReadFromFile: Zero offset");\r
 799                 //return;\r
 800         }\r
 801         if (lseek(gvar->pm.fi.PageFile,offset,SEEK_SET) != offset)\r
 802         {\r
 803                 Quit("PML_ReadFromFile: Seek failed");\r
 804                 //return;\r
 805         }\r
 806         if (!CA_FarRead(gvar->pm.fi.PageFile,buf,length, gvar))\r
 807         {\r
 808                 Quit("PML_ReadFromFile: Read failed");\r
 809                 //return;\r
 810         }\r
 811 }\r
 812 \r
 813 //\r
 814 //      PML_OpenPageFile() - Opens the page file and sets up the page info\r
 815 //\r
 816 void\r
 817 PML_OpenPageFile(global_game_variables_t *gvar)\r
 818 {\r
 819         int                             i;\r
 820         long                    size;\r
 821                                 //__SEGA buf;\r
 822         memptr          buf;\r
 823         dword           far *offsetptr;\r
 824         word                    far *lengthptr;\r
 825         PageListStruct  far *page;\r
 826 \r
 827         gvar->pm.fi.PageFile = open(gvar->pm.fi.PageFileName,O_RDONLY + O_BINARY);\r
 828         if (gvar->pm.fi.PageFile == -1)\r
 829         {\r
 830                 Quit("PML_OpenPageFile: Unable to open page file");\r
 831                 //return;\r
 832         }\r
 833 \r
 834         // Read in header variables\r
 835         read(gvar->pm.fi.PageFile,&gvar->pm.fi.ChunksInFile,sizeof(gvar->pm.fi.ChunksInFile));\r
 836         read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSpriteStart,sizeof(gvar->pm.fi.PMSpriteStart));\r
 837         read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSoundStart,sizeof(gvar->pm.fi.PMSoundStart));\r
 838 \r
 839         // Allocate and clear the page list\r
 840         gvar->pm.PMNumBlocks = gvar->pm.fi.ChunksInFile;\r
 841         MM_GetPtr((memptr *)gvar->pm.PMSegPages, sizeof(PageListStruct) * (gvar->pm.PMNumBlocks), gvar);\r
 842         MM_SetLock((memptr *)gvar->pm.PMSegPages,true, gvar);\r
 843         gvar->pm.PMPages = (PageListStruct far *)gvar->pm.PMSegPages;\r
 844         _fmemset(gvar->pm.PMPages,0,sizeof(PageListStruct) * gvar->pm.PMNumBlocks);\r
 845 \r
 846         // Read in the chunk offsets\r
 847         size = sizeof(dword) * gvar->pm.fi.ChunksInFile;\r
 848         MM_GetPtr(&buf, size, gvar);\r
 849         if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))\r
 850         {\r
 851                 Quit("PML_OpenPageFile: Offset read failed");\r
 852                 //return;\r
 853         }\r
 854         offsetptr = (dword far *)buf;\r
 855         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 856                 page->offset = *offsetptr++;\r
 857         MM_FreePtr(&buf, gvar);\r
 858 \r
 859         // Read in the chunk lengths\r
 860         size = sizeof(word) * gvar->pm.fi.ChunksInFile;\r
 861         MM_GetPtr(&buf,size, gvar);\r
 862         if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))\r
 863         {\r
 864                 Quit("PML_OpenPageFile: Length read failed");\r
 865                 //return;\r
 866         }\r
 867         lengthptr = (word far *)buf;\r
 868         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 869                 page->length = *lengthptr++;\r
 870         MM_FreePtr(&buf, gvar);\r
 871 }\r
 872 \r
 873 //\r
 874 //  PML_ClosePageFile() - Closes the page file\r
 875 //\r
 876 void\r
 877 PML_ClosePageFile(global_game_variables_t *gvar)\r
 878 {\r
 879         if (gvar->pm.fi.PageFile != -1)\r
 880                 close(gvar->pm.fi.PageFile);\r
 881         if (gvar->pm.PMSegPages)\r
 882         {\r
 883                 MM_SetLock((memptr)gvar->pm.PMSegPages,false, gvar);\r
 884                 MM_FreePtr((memptr)gvar->pm.PMSegPages, gvar);\r
 885         }\r
 886 }\r
 887 \r
 888 /////////////////////////////////////////////////////////////////////////////\r
 889 //\r
 890 //      Allocation, etc., code\r
 891 //\r
 892 /////////////////////////////////////////////////////////////////////////////\r
 893 \r
 894 //\r
 895 //      PML_GetEMSAddress()\r
 896 //\r
 897 //              Page is in EMS, so figure out which EMS physical page should be used\r
 898 //              to map our page in. If normal page, use EMS physical page 3, else\r
 899 //              use the physical page specified by the lock type\r
 900 //\r
 901 #ifndef __DEBUG_2__\r
 902 #pragma argsused        // DEBUG - remove lock parameter\r
 903 memptr\r
 904 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)\r
 905 {\r
 906         int             i,emspage;\r
 907         word    emsoff,emsbase,offset;\r
 908 \r
 909         emsoff = page & (PMEMSSubPage - 1);\r
 910         emsbase = page - emsoff;\r
 911 \r
 912         emspage = -1;\r
 913         // See if this page is already mapped in\r
 914         for (i = 0;i < EMSFrameCount;i++)\r
 915         {\r
 916                 if (gvar->pm.emm.EMSList[i].baseEMSPage == emsbase)\r
 917                 {\r
 918                         emspage = i;    // Yep - don't do a redundant remapping\r
 919                         break;\r
 920                 }\r
 921         }\r
 922 \r
 923         // If page isn't already mapped in, find LRU EMS frame, and use it\r
 924         if (emspage == -1)\r
 925         {\r
 926                 dword last = LONG_MAX;\r
 927                 for (i = 0;i < EMSFrameCount;i++)\r
 928                 {\r
 929                         if (gvar->pm.emm.EMSList[i].lastHit < last)\r
 930                         {\r
 931                                 emspage = i;\r
 932                                 last = gvar->pm.emm.EMSList[i].lastHit;\r
 933                         }\r
 934                 }\r
 935 \r
 936                 gvar->pm.emm.EMSList[emspage].baseEMSPage = emsbase;\r
 937                 PML_MapEMS(page / PMEMSSubPage,emspage, gvar);\r
 938         }\r
 939 \r
 940         if (emspage == -1)\r
 941                 Quit("PML_GetEMSAddress: EMS find failed");\r
 942 \r
 943         gvar->pm.emm.EMSList[emspage].lastHit = gvar->pm.PMFrameCount;\r
 944         offset = emspage * EMSPageSizeSeg;\r
 945         offset += emsoff * PMPageSizeSeg;\r
 946         return((memptr)(gvar->pm.emm.EMSPageFrame + offset));\r
 947 }\r
 948 #else\r
 949 memptr\r
 950 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)\r
 951 {\r
 952         word    emspage;\r
 953 \r
 954         emspage = (lock < pml_EMSLock)? 3 : (lock - pml_EMSLock);\r
 955 \r
 956         PML_MapEMS(page / PMEMSSubPage,emspage);\r
 957 \r
 958         return((memptr)(EMSPageFrame + (emspage * EMSPageSizeSeg)\r
 959                         + ((page & (PMEMSSubPage - 1)) * PMPageSizeSeg)));\r
 960 }\r
 961 #endif\r
 962 \r
 963 //\r
 964 //      PM_GetPageAddress() - Returns the address of a given page\r
 965 //              Maps in EMS if necessary\r
 966 //              Returns nil if block isn't cached into Main Memory or EMS\r
 967 //\r
 968 //\r
 969 memptr\r
 970 PM_GetPageAddress(int pagenum, global_game_variables_t *gvar)\r
 971 {\r
 972         PageListStruct  far *page;\r
 973 \r
 974         page = &gvar->pm.PMPages[pagenum];\r
 975         if (page->mainPage != -1)\r
 976                 return(gvar->pm.mm.MainMemPages[page->mainPage]);\r
 977         else if (page->emsPage != -1)\r
 978                 return(PML_GetEMSAddress(page->emsPage,page->locked, gvar));\r
 979         else\r
 980                 return(nil);\r
 981 }\r
 982 \r
 983 //\r
 984 //      PML_GiveLRUPage() - Returns the page # of the least recently used\r
 985 //              present & unlocked main/EMS page (or main page if mainonly is true)\r
 986 //\r
 987 int\r
 988 PML_GiveLRUPage(boolean mainonly, global_game_variables_t *gvar)\r
 989 {\r
 990         int                             i,lru;\r
 991         long                    last;\r
 992         PageListStruct  far *page;\r
 993 \r
 994         for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 995         {\r
 996                 if\r
 997                 (\r
 998                         (page->lastHit < last)\r
 999                 &&      ((page->emsPage != -1) || (page->mainPage != -1))\r
1000                 &&      (page->locked == pml_Unlocked)\r
1001                 &&      (!(mainonly && (page->mainPage == -1)))\r
1002                 )\r
1003                 {\r
1004                         last = page->lastHit;\r
1005                         lru = i;\r
1006                 }\r
1007         }\r
1008 \r
1009         if (lru == -1)\r
1010                 Quit("PML_GiveLRUPage: LRU Search failed");\r
1011         return(lru);\r
1012 }\r
1013 \r
1014 //\r
1015 //      PML_GiveLRUXMSPage() - Returns the page # of the least recently used\r
1016 //              (and present) XMS page.\r
1017 //      This routine won't return the XMS page protected (by XMSProtectPage)\r
1018 //\r
1019 int\r
1020 PML_GiveLRUXMSPage(global_game_variables_t *gvar)\r
1021 {\r
1022         int                             i,lru;\r
1023         long                    last;\r
1024         PageListStruct  far *page;\r
1025 \r
1026         for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
1027         {\r
1028                 if\r
1029                 (\r
1030                         (page->xmsPage != -1)\r
1031                 &&      (page->lastHit < last)\r
1032                 &&      (i != gvar->pm.xmm.XMSProtectPage)\r
1033                 )\r
1034                 {\r
1035                         last = page->lastHit;\r
1036                         lru = i;\r
1037                 }\r
1038         }\r
1039         return(lru);\r
1040 }\r
1041 \r
1042 //\r
1043 //      PML_PutPageInXMS() - If page isn't in XMS, find LRU XMS page and replace\r
1044 //              it with the main/EMS page\r
1045 //\r
1046 void\r
1047 PML_PutPageInXMS(int pagenum, global_game_variables_t *gvar)\r
1048 {\r
1049         int                             usexms;\r
1050         PageListStruct  far *page;\r
1051 \r
1052         if (!gvar->pm.xmm.XMSPresent)\r
1053                 return;\r
1054 \r
1055         page = &gvar->pm.PMPages[pagenum];\r
1056         if (page->xmsPage != -1)\r
1057                 return;                                 // Already in XMS\r
1058 \r
1059         if (gvar->pm.XMSPagesUsed < gvar->pm.xmm.XMSPagesAvail)\r
1060                 page->xmsPage = gvar->pm.XMSPagesUsed++;\r
1061         else\r
1062         {\r
1063                 usexms = PML_GiveLRUXMSPage(gvar);\r
1064                 if (usexms == -1)\r
1065                         Quit("PML_PutPageInXMS: No XMS LRU");\r
1066                 page->xmsPage = gvar->pm.PMPages[usexms].xmsPage;\r
1067                 gvar->pm.PMPages[usexms].xmsPage = -1;\r
1068         }\r
1069         PML_CopyToXMS(PM_GetPageAddress(pagenum, gvar),page->xmsPage,page->length, gvar);\r
1070 }\r
1071 \r
1072 //\r
1073 //      PML_TransferPageSpace() - A page is being replaced, so give the new page\r
1074 //              the old one's address space. Returns the address of the new page.\r
1075 //\r
1076 memptr\r
1077 PML_TransferPageSpace(int orig,int new, global_game_variables_t *gvar)\r
1078 {\r
1079         memptr                  addr;\r
1080         PageListStruct  far *origpage,far *newpage;\r
1081 \r
1082         if (orig == new)\r
1083                 Quit("PML_TransferPageSpace: Identity replacement");\r
1084 \r
1085         origpage = &gvar->pm.PMPages[orig];\r
1086         newpage = &gvar->pm.PMPages[new];\r
1087 \r
1088         if (origpage->locked != pml_Unlocked)\r
1089                 Quit("PML_TransferPageSpace: Killing locked page");\r
1090 \r
1091         if ((origpage->emsPage == -1) && (origpage->mainPage == -1))\r
1092                 Quit("PML_TransferPageSpace: Reusing non-existent page");\r
1093 \r
1094         // Copy page that's about to be purged into XMS\r
1095         PML_PutPageInXMS(orig, gvar);\r
1096 \r
1097         // Get the address, and force EMS into a physical page if necessary\r
1098         addr = PM_GetPageAddress(orig, gvar);\r
1099 \r
1100         // Steal the address\r
1101         newpage->emsPage = origpage->emsPage;\r
1102         newpage->mainPage = origpage->mainPage;\r
1103 \r
1104         // Mark replaced page as purged\r
1105         origpage->mainPage = origpage->emsPage = -1;\r
1106 \r
1107         if (!addr)\r
1108                 Quit("PML_TransferPageSpace: Zero replacement");\r
1109 \r
1110         return(addr);\r
1111 }\r
1112 \r
1113 //\r
1114 //      PML_GetAPageBuffer() - A page buffer is needed. Either get it from the\r
1115 //              main/EMS free pool, or use PML_GiveLRUPage() to find which page to\r
1116 //              steal the buffer from. Returns a far pointer to the page buffer, and\r
1117 //              sets the fields inside the given page structure appropriately.\r
1118 //              If mainonly is true, free EMS will be ignored, and only main pages\r
1119 //              will be looked at by PML_GiveLRUPage().\r
1120 //\r
1121 byte far *\r
1122 PML_GetAPageBuffer(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
1123 {\r
1124         byte                    far *addr = nil;\r
1125         int                             i,n;\r
1126         PMBlockAttr             *used;\r
1127         PageListStruct  far *page;\r
1128 \r
1129         page = &gvar->pm.PMPages[pagenum];\r
1130         if ((gvar->pm.EMSPagesUsed < gvar->pm.emm.EMSPagesAvail) && !mainonly)\r
1131         {\r
1132                 // There's remaining EMS - use it\r
1133                 page->emsPage = gvar->pm.EMSPagesUsed++;\r
1134                 addr = PML_GetEMSAddress(page->emsPage,page->locked, gvar);\r
1135         }\r
1136         else if (gvar->pm.MainPagesUsed < gvar->pm.mm.MainPagesAvail)\r
1137         {\r
1138                 // There's remaining main memory - use it\r
1139                 for (i = 0,n = -1,used = gvar->pm.mm.MainMemUsed;i < PMMaxMainMem;i++,used++)\r
1140                 {\r
1141                         if ((*used & pmba_Allocated) && !(*used & pmba_Used))\r
1142                         {\r
1143                                 n = i;\r
1144                                 *used |= pmba_Used;\r
1145                                 break;\r
1146                         }\r
1147                 }\r
1148                 if (n == -1)\r
1149                         Quit("PML_GetPageBuffer: MainPagesAvail lied");\r
1150                 addr = gvar->pm.mm.MainMemPages[n];\r
1151                 if (!addr)\r
1152                         Quit("PML_GetPageBuffer: Purged main block");\r
1153                 page->mainPage = n;\r
1154                 gvar->pm.MainPagesUsed++;\r
1155         }\r
1156         else\r
1157                 addr = PML_TransferPageSpace(PML_GiveLRUPage(mainonly, gvar),pagenum, gvar);\r
1158 \r
1159         if (!addr)\r
1160                 Quit("PML_GetPageBuffer: Search failed");\r
1161         return(addr);\r
1162 }\r
1163 \r
1164 //\r
1165 //      PML_GetPageFromXMS() - If page is in XMS, find LRU main/EMS page and\r
1166 //              replace it with the page from XMS. If mainonly is true, will only\r
1167 //              search for LRU main page.\r
1168 //      XMSProtectPage is set to the page to be retrieved from XMS, so that if\r
1169 //              the page from which we're stealing the main/EMS from isn't in XMS,\r
1170 //              it won't copy over the page that we're trying to get from XMS.\r
1171 //              (pages that are being purged are copied into XMS, if possible)\r
1172 //\r
1173 memptr\r
1174 PML_GetPageFromXMS(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
1175 {\r
1176         byte                    far *checkaddr;\r
1177         memptr                  addr = nil;\r
1178         PageListStruct  far *page;\r
1179 \r
1180         page = &gvar->pm.PMPages[pagenum];\r
1181         if (gvar->pm.xmm.XMSPresent && (page->xmsPage != -1))\r
1182         {\r
1183                 gvar->pm.xmm.XMSProtectPage = pagenum;\r
1184                 checkaddr = PML_GetAPageBuffer(pagenum,mainonly, gvar);\r
1185                 if (FP_OFF(checkaddr))\r
1186                         Quit("PML_GetPageFromXMS: Non segment pointer");\r
1187                 addr = (memptr)FP_SEG(checkaddr);\r
1188                 PML_CopyFromXMS(addr,page->xmsPage,page->length, gvar);\r
1189                 gvar->pm.xmm.XMSProtectPage = -1;\r
1190         }\r
1191 \r
1192         return(addr);\r
1193 }\r
1194 \r
1195 //\r
1196 //      PML_LoadPage() - A page is not in main/EMS memory, and it's not in XMS.\r
1197 //              Load it into either main or EMS. If mainonly is true, the page will\r
1198 //              only be loaded into main.\r
1199 //\r
1200 void\r
1201 PML_LoadPage(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
1202 {\r
1203         byte                    far *addr;\r
1204         PageListStruct  far *page;\r
1205 \r
1206         addr = PML_GetAPageBuffer(pagenum,mainonly, gvar);\r
1207         page = &gvar->pm.PMPages[pagenum];\r
1208         PML_ReadFromFile(addr,page->offset,page->length, gvar);\r
1209 }\r
1210 \r
1211 //\r
1212 //      PM_GetPage() - Returns the address of the page, loading it if necessary\r
1213 //              First, check if in Main Memory or EMS\r
1214 //              Then, check XMS\r
1215 //              If not in XMS, load into Main Memory or EMS\r
1216 //\r
1217 #pragma warn -pia\r
1218 memptr\r
1219 PM_GetPage(int pagenum, global_game_variables_t *gvar)\r
1220 {\r
1221         memptr  result;\r
1222 \r
1223         if (pagenum >= gvar->pm.fi.ChunksInFile)\r
1224                 Quit("PM_GetPage: Invalid page request");\r
1225 \r
1226 #ifdef __DEBUG_2__      // for debugging\r
1227         __asm {\r
1228                 mov     dx,STATUS_REGISTER_1\r
1229                 in      al,dx\r
1230                 mov     dx,ATR_INDEX\r
1231                 mov     al,ATR_OVERSCAN\r
1232                 out     dx,al\r
1233                 mov     al,10   // bright green\r
1234                 out     dx,al\r
1235         }\r
1236 #endif\r
1237 \r
1238         if (!(result = PM_GetPageAddress(pagenum, gvar)))\r
1239         {\r
1240                 boolean mainonly = (pagenum >= gvar->pm.fi.PMSoundStart);\r
1241 if (!gvar->pm.PMPages[pagenum].offset)  // JDC: sparse page\r
1242         Quit ("Tried to load a sparse page!");\r
1243                 if (!(result = PML_GetPageFromXMS(pagenum,mainonly, gvar)))\r
1244                 {\r
1245                         if (gvar->pm.PMPages[pagenum].lastHit ==  gvar->pm.PMFrameCount)\r
1246                                 gvar->pm.PMThrashing++;\r
1247 \r
1248                         PML_LoadPage(pagenum,mainonly, gvar);\r
1249                         result = PM_GetPageAddress(pagenum, gvar);\r
1250                 }\r
1251         }\r
1252         gvar->pm.PMPages[pagenum].lastHit =  gvar->pm.PMFrameCount;\r
1253 \r
1254 #ifdef __DEBUG_2__      // for debugging\r
1255         __asm{\r
1256                 mov     dx,STATUS_REGISTER_1\r
1257                 in      al,dx\r
1258                 mov     dx,ATR_INDEX\r
1259                 mov     al,ATR_OVERSCAN\r
1260                 out     dx,al\r
1261                 mov     al,3    // blue\r
1262                 out     dx,al\r
1263                 mov     al,0x20 // normal\r
1264                 out     dx,al\r
1265 #endif\r
1266 \r
1267         return(result);\r
1268 }\r
1269 #pragma warn +pia\r
1270 \r
1271 //\r
1272 //      PM_SetPageLock() - Sets the lock type on a given page\r
1273 //              pml_Unlocked: Normal, page can be purged\r
1274 //              pml_Locked: Cannot be purged\r
1275 //              pml_EMS?: Same as pml_Locked, but if in EMS, use the physical page\r
1276 //                                      specified when returning the address. For sound stuff.\r
1277 //\r
1278 void\r
1279 PM_SetPageLock(int pagenum,PMLockType lock, global_game_variables_t *gvar)\r
1280 {\r
1281         if (pagenum < gvar->pm.fi.PMSoundStart)\r
1282                 Quit("PM_SetPageLock: Locking/unlocking non-sound page");\r
1283 \r
1284         gvar->pm.PMPages[pagenum].locked = lock;\r
1285 }\r
1286 \r
1287 //\r
1288 //      PM_Preload() - Loads as many pages as possible into all types of memory.\r
1289 //              Calls the update function after each load, indicating the current\r
1290 //              page, and the total pages that need to be loaded (for thermometer).\r
1291 //\r
1292 void\r
1293 PM_Preload(boolean (*update)(word current,word total), global_game_variables_t *gvar)\r
1294 {\r
1295         int                             i,j,\r
1296                                         page,oogypage;\r
1297         word                    current,total,\r
1298                                         totalnonxms,totalxms,\r
1299                                         mainfree,maintotal,\r
1300                                         emsfree,emstotal,\r
1301                                         xmsfree,xmstotal;\r
1302         memptr                  addr;\r
1303         PageListStruct  far *p;\r
1304 \r
1305         mainfree = (gvar->pm.mm.MainPagesAvail - gvar->pm.MainPagesUsed) + (gvar->pm.emm.EMSPagesAvail - gvar->pm.EMSPagesUsed);\r
1306         xmsfree = (gvar->pm.xmm.XMSPagesAvail - gvar->pm.XMSPagesUsed);\r
1307 \r
1308         xmstotal = maintotal = 0;\r
1309 \r
1310         for (i = 0;i < gvar->pm.fi.ChunksInFile;i++)\r
1311         {\r
1312                 if (!gvar->pm.PMPages[i].offset)\r
1313                         continue;                       // sparse\r
1314 \r
1315                 if ( gvar->pm.PMPages[i].emsPage != -1 || gvar->pm.PMPages[i].mainPage != -1 )\r
1316                         continue;                       // already in main mem\r
1317 \r
1318                 if ( mainfree )\r
1319                 {\r
1320                         maintotal++;\r
1321                         mainfree--;\r
1322                 }\r
1323                 else if ( xmsfree && (gvar->pm.PMPages[i].xmsPage == -1) )\r
1324                 {\r
1325                         xmstotal++;\r
1326                         xmsfree--;\r
1327                 }\r
1328         }\r
1329 \r
1330 \r
1331         total = maintotal + xmstotal;\r
1332 \r
1333         if (!total)\r
1334                 return;\r
1335 \r
1336         page = 0;\r
1337         current = 0;\r
1338 \r
1339 //\r
1340 // cache main/ems blocks\r
1341 //\r
1342         while (maintotal)\r
1343         {\r
1344                 while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].mainPage != -1\r
1345                         ||      gvar->pm.PMPages[page].emsPage != -1 )\r
1346                         page++;\r
1347 \r
1348                 if (page >= gvar->pm.fi.ChunksInFile)\r
1349                         Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");\r
1350 \r
1351                 PM_GetPage(page, gvar);\r
1352 \r
1353                 page++;\r
1354                 current++;\r
1355                 maintotal--;\r
1356                 update(current,total);\r
1357         }\r
1358 \r
1359 //\r
1360 // load stuff to XMS\r
1361 //\r
1362         if (xmstotal)\r
1363         {\r
1364                 for (oogypage = 0 ; gvar->pm.PMPages[oogypage].mainPage == -1 ; oogypage++)\r
1365                 ;\r
1366                 addr = PM_GetPage(oogypage, gvar);\r
1367                 if (!addr)\r
1368                         Quit("PM_Preload: XMS buffer failed");\r
1369 \r
1370                 while (xmstotal)\r
1371                 {\r
1372                         while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].xmsPage != -1 )\r
1373                                 page++;\r
1374 \r
1375                         if (page >= gvar->pm.fi.ChunksInFile)\r
1376                                 Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");\r
1377 \r
1378                         p = &gvar->pm.PMPages[page];\r
1379 \r
1380                         p->xmsPage = gvar->pm.XMSPagesUsed++;\r
1381                         if (gvar->pm.XMSPagesUsed > gvar->pm.xmm.XMSPagesAvail)\r
1382                                 Quit("PM_Preload: Exceeded XMS pages");\r
1383                         if (p->length > PMPageSize)\r
1384                                 Quit("PM_Preload: Page too long");\r
1385 \r
1386                         PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);\r
1387                         PML_CopyToXMS((byte far *)addr,p->xmsPage,p->length, gvar);\r
1388 \r
1389                         page++;\r
1390                         current++;\r
1391                         xmstotal--;\r
1392                         update(current,total);\r
1393                 }\r
1394 \r
1395                 p = &gvar->pm.PMPages[oogypage];\r
1396                 PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);\r
1397         }\r
1398 \r
1399         update(total,total);\r
1400 }\r
1401 \r
1402 /////////////////////////////////////////////////////////////////////////////\r
1403 //\r
1404 //      General code\r
1405 //\r
1406 /////////////////////////////////////////////////////////////////////////////\r
1407 \r
1408 //\r
1409 //      PM_NextFrame() - Increments the frame counter and adjusts the thrash\r
1410 //              avoidence variables\r
1411 //\r
1412 //              If currently in panic mode (to avoid thrashing), check to see if the\r
1413 //                      appropriate number of frames have passed since the last time that\r
1414 //                      we would have thrashed. If so, take us out of panic mode.\r
1415 //\r
1416 //\r
1417 void\r
1418 PM_NextFrame(global_game_variables_t *gvar)\r
1419 {\r
1420         int     i;\r
1421 \r
1422         // Frame count overrun - kill the LRU hit entries & reset frame count\r
1423         if (++gvar->pm.PMFrameCount >= LONG_MAX - 4)\r
1424         {\r
1425                 for (i = 0;i < gvar->pm.PMNumBlocks;i++)\r
1426                         gvar->pm.PMPages[i].lastHit = 0;\r
1427                 gvar->pm.PMFrameCount = 0;\r
1428         }\r
1429 \r
1430 //#if 0\r
1431         for (i = 0;i < gvar->pm.fi.PMSoundStart;i++)\r
1432         {\r
1433                 if (gvar->pm.PMPages[i].locked)\r
1434                 {\r
1435                         char buf[40];\r
1436                         sprintf(buf,"PM_NextFrame: Page %d is locked",i);\r
1437                         Quit(buf);\r
1438                 }\r
1439         }\r
1440 //#endif\r
1441 \r
1442         if (gvar->pm.PMPanicMode)\r
1443         {\r
1444                 // DEBUG - set border color\r
1445                 if ((!gvar->pm.PMThrashing) && (!--gvar->pm.PMPanicMode))\r
1446                 {\r
1447                         // DEBUG - reset border color\r
1448                 }\r
1449         }\r
1450         if (gvar->pm.PMThrashing >= PMThrashThreshold)\r
1451                 gvar->pm.PMPanicMode = PMUnThrashThreshold;\r
1452         gvar->pm.PMThrashing = false;\r
1453 }\r
1454 \r
1455 //\r
1456 //      PM_Reset() - Sets up caching structures\r
1457 //\r
1458 void\r
1459 PM_Reset(global_game_variables_t *gvar)\r
1460 {\r
1461         int                             i;\r
1462         PageListStruct  far *page;\r
1463 \r
1464         gvar->pm.xmm.XMSPagesAvail = gvar->pm.xmm.XMSAvail / PMPageSizeKB;\r
1465 \r
1466         gvar->pm.emm.EMSPagesAvail = gvar->pm.emm.EMSAvail * (EMSPageSizeKB / PMPageSizeKB);\r
1467         gvar->pm.emm.EMSPhysicalPage = 0;\r
1468 \r
1469         gvar->pm.MainPagesUsed = gvar->pm.EMSPagesUsed = gvar->pm.XMSPagesUsed = 0;\r
1470 \r
1471         gvar->pm.PMPanicMode = false;\r
1472 \r
1473         gvar->pm.fi.PageFile = -1;\r
1474         gvar->pm.xmm.XMSProtectPage = -1;\r
1475 \r
1476         // Initialize page list\r
1477         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.PMNumBlocks;i++,page++)\r
1478         {\r
1479                 page->mainPage = -1;\r
1480                 page->emsPage = -1;\r
1481                 page->xmsPage = -1;\r
1482                 page->locked = false;\r
1483         }\r
1484 }\r
1485 \r
1486 //\r
1487 //      PM_Startup() - Start up the Page Mgr\r
1488 //\r
1489 void\r
1490 PM_Startup(global_game_variables_t *gvar)\r
1491 {\r
1492         boolean nomain,noems,noxms;\r
1493         int             i;\r
1494 \r
1495         if (gvar->pm.PMStarted)\r
1496                 return;\r
1497 \r
1498         //strcpy(&(gvar->pm.fi.PageFileName), "VSWAP.");\r
1499 \r
1500         nomain = noems = noxms = false;\r
1501         for (i = 1;i <\r
1502 #ifdef __WATCOMC__\r
1503         __argc\r
1504 #endif\r
1505 #ifdef __BORLANDC__\r
1506         _argc\r
1507 #endif\r
1508         ;i++)\r
1509         {\r
1510                 switch (US_CheckParm(\r
1511 #ifdef __WATCOMC__\r
1512         __argv[i]\r
1513 #endif\r
1514 #ifdef __BORLANDC__\r
1515         _argv[i]\r
1516 #endif\r
1517                 ,ParmStrings))\r
1518                 {\r
1519                 case 0:\r
1520                         nomain = true;\r
1521                         break;\r
1522                 case 1:\r
1523                         noems = true;\r
1524                         break;\r
1525                 case 2:\r
1526                         noxms = true;\r
1527                         break;\r
1528                 }\r
1529         }\r
1530 \r
1531         //0000+=+=PML_OpenPageFile(gvar);\r
1532 \r
1533         if (!noems && MML_CheckForEMS())\r
1534                 PML_StartupEMS(gvar);\r
1535         if (!noxms && MML_CheckForXMS())\r
1536                 PML_StartupXMS(gvar);\r
1537         if(!nomain)\r
1538                 PML_StartupMainMem(gvar);\r
1539 \r
1540         if (!gvar->pm.mm.MainPresent && !gvar->pm.emm.EMSPresent && !gvar->pm.xmm.XMSPresent)\r
1541         {\r
1542                 Quit("PM_Startup: No main or EMS\n");\r
1543                 //return;\r
1544         }\r
1545 \r
1546         PM_Reset(gvar);\r
1547 \r
1548         gvar->pm.PMStarted = true;\r
1549 }\r
1550 \r
1551 //\r
1552 //      PM_Shutdown() - Shut down the Page Mgr\r
1553 //\r
1554 void\r
1555 PM_Shutdown(global_game_variables_t *gvar)\r
1556 {\r
1557         if(MML_CheckForXMS()) PML_ShutdownXMS(gvar);\r
1558         if(MML_CheckForEMS()) PML_ShutdownEMS(gvar);\r
1559 \r
1560         if (!gvar->pm.PMStarted)\r
1561                 return;\r
1562 \r
1563         PML_ClosePageFile(gvar);\r
1564 \r
1565         PML_ShutdownMainMem(gvar);\r
1566 }\r