src/lib/16_pm.c

   1 /* Project 16 Source Code~\r
   2  * Copyright (C) 2012-2016 sparky4 & pngwen & andrius4669 & joncampbell123 & yakui-lover\r
   3  *\r
   4  * This file is part of Project 16.\r
   5  *\r
   6  * Project 16 is free software; you can redistribute it and/or modify\r
   7  * it under the terms of the GNU General Public License as published by\r
   8  * the Free Software Foundation; either version 3 of the License, or\r
   9  * (at your option) any later version.\r
  10  *\r
  11  * Project 16 is distributed in the hope that it will be useful,\r
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
  14  * GNU General Public License for more details.\r
  15  *\r
  16  * You should have received a copy of the GNU General Public License\r
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>, or\r
  18  * write to the Free Software Foundation, Inc., 51 Franklin Street,\r
  19  * Fifth Floor, Boston, MA 02110-1301 USA.\r
  20  *\r
  21  */\r
  22 \r
  23 //\r
  24 //      ID_PM.C\r
  25 //      Id Engine's Page Manager v1.0\r
  26 //      Primary coder: Jason Blochowiak\r
  27 //\r
  28 \r
  29 #include "src/lib/16_pm.h"\r
  30 #pragma hdrstop\r
  31 \r
  32 #ifdef __DEBUG__\r
  33 boolean debugpm=0;\r
  34 #endif\r
  35 \r
  36 //      Main Mem specific variables\r
  37 /*      boolean                 MainPresent;\r
  38         memptr                  MainMemPages[PMMaxMainMem];\r
  39         PMBlockAttr             gvar->pm.mm.MainMemUsed[PMMaxMainMem];\r
  40         int                             gvar->pm.mm.MainPagesAvail;\r
  41 \r
  42 //      EMS specific variables\r
  43         boolean                 EMSPresent;\r
  44         word                    gvar->pm.emm.EMSAvail,gvar->pm.emm.EMSPagesAvail,gvar->pm.emm.EMSHandle,\r
  45                                         gvar->pm.emm.EMSPageFrame,gvar->pm.emm.EMSPhysicalPage;\r
  46         gvar->pm.emm.EMSListStruct      gvar->pm.emm.EMSList[EMSFrameCount];\r
  47 \r
  48 //      XMS specific variables\r
  49         boolean                 XMSPresent;\r
  50         word                    gvar->pm.xmm.XMSAvail,gvar->pm.xmm.XMSPagesAvail,gvar->pm.xmm.XMSHandle;*/\r
  51         word            XMSDriver;\r
  52 /*      int                             gvar->pm.xmm.XMSProtectPage = -1;\r
  53 \r
  54 //      File specific variables\r
  55         char                    gvar->pm.fi.PageFileName[13] = {"VSWAP."};\r
  56         int                             PageFile = -1;\r
  57         word                    gvar->pm.fi.ChunksInFile;\r
  58         word                    PMSpriteStart,PMSoundStart;\r
  59 \r
  60 //      General usage variables\r
  61         boolean                 PMStarted,\r
  62                                         gvar->pm.PMPanicMode,\r
  63                                         gvar->pm.PMThrashing;\r
  64         word                    gvar->pm.XMSPagesUsed,\r
  65                                         gvar->pm.EMSPagesUsed,\r
  66                                         MainPagesUsed,\r
  67                                         gvar->pm.PMNumBlocks;\r
  68         long                    PMFrameCount;\r
  69         PageListStruct  far *gvar->pm.PMPages,\r
  70                                         _seg *gvar->pm.PMSegPages;\r
  71 */\r
  72 boolean         PMStarted, MainPresent, EMSPresent, XMSPresent;\r
  73 static  char            *ParmStrings[] = {"nomain","noems","noxms",nil};\r
  74 \r
  75 /////////////////////////////////////////////////////////////////////////////\r
  76 //\r
  77 //      EMS Management code\r
  78 //\r
  79 /////////////////////////////////////////////////////////////////////////////\r
  80 \r
  81 //\r
  82 //      PML_MapEMS() - Maps a logical page to a physical page\r
  83 //\r
  84 byte\r
  85 PML_MapEMS(word logical, byte physical, global_game_variables_t *gvar)\r
  86 {\r
  87         byte    str[160];\r
  88         unsigned        EMShandle;\r
  89         byte err;\r
  90         boolean errorflag=false;\r
  91         int     i;\r
  92         EMShandle=gvar->pm.emm.EMSHandle;\r
  93 \r
  94         __asm {\r
  95                 mov     ah,EMS_MAPPAGE\r
  96                 mov     al,physical\r
  97                 mov     bx,logical\r
  98                 mov     dx,EMShandle\r
  99                 int     EMS_INT\r
 100                 or      ah,ah\r
 101                 jnz     error\r
 102                 jmp End\r
 103 #ifdef __BORLANDC__\r
 104         }\r
 105 #endif\r
 106                 error:\r
 107 #ifdef __BORLANDC__\r
 108         __asm {\r
 109 #endif\r
 110                 mov     err,ah\r
 111                 mov     errorflag,1\r
 112 #ifdef __BORLANDC__\r
 113         }\r
 114 #endif\r
 115                 End:\r
 116 #ifdef __WATCOMC__\r
 117         }\r
 118 #endif\r
 119         if(errorflag==true)\r
 120         {\r
 121                 strcpy(str,"MM_MapEMS: EMS error ");\r
 122                 MM_EMSerr(str, err);\r
 123                 printf("%s\n",str);\r
 124                 Quit("PML_MapEMS: Page mapping failed\n");\r
 125                 return err;\r
 126         }\r
 127         return 0;\r
 128 }\r
 129 \r
 130 //\r
 131 //      PML_StartupEMS() - Sets up EMS for Page Mgr's use\r
 132 //              Checks to see if EMS driver is present\r
 133 //      Verifies that EMS hardware is present\r
 134 //              Make sure that EMS version is 3.2 or later\r
 135 //              If there's more than our minimum (2 pages) available, allocate it (up\r
 136 //                      to the maximum we need)\r
 137 //\r
 138 \r
 139 boolean\r
 140 PML_StartupEMS(global_game_variables_t *gvar)\r
 141 {\r
 142         int             i;\r
 143         long    size;\r
 144         byte    str[160];\r
 145         byte err;\r
 146 \r
 147         boolean errorflag=0;\r
 148         static char     emmname[] = "EMMXXXX0"; //fix by andrius4669\r
 149         unsigned int EMSVer = 0;\r
 150         unsigned        totalEMSpages,freeEMSpages,EMSPageFrame,EMSHandle,EMSAvail;\r
 151         totalEMSpages = freeEMSpages = EMSPageFrame = 0;\r
 152         EMSPresent = false;                     // Assume that we'll fail\r
 153         gvar->pm.emm.EMSAvail = 0;\r
 154 \r
 155         __asm {\r
 156                 mov     dx,OFFSET emmname       //fix by andrius4669\r
 157                 mov     ax,0x3d00\r
 158                 int     EMS_INT         // try to open EMMXXXX0 device\r
 159                 jc      error1\r
 160 \r
 161                 mov     bx,ax\r
 162                 mov     ax,0x4400\r
 163 \r
 164                 int     EMS_INT         // get device info\r
 165                 jc      error1\r
 166 \r
 167                 and     dx,0x80\r
 168                 jz      error1\r
 169 \r
 170                 mov     ax,0x4407\r
 171 \r
 172                 int     EMS_INT         // get status\r
 173                 jc      error1\r
 174                 or      al,al\r
 175                 jz      error1\r
 176 \r
 177                 mov     ah,0x3e\r
 178                 int     EMS_INT         // close handle\r
 179                 jc      error1\r
 180 \r
 181                 mov     ah,EMS_STATUS\r
 182                 int     EMS_INT\r
 183                 jc      error1                  // make sure EMS hardware is present\r
 184 \r
 185                 mov     ah,EMS_VERSION\r
 186                 int     EMS_INT                 // only work on EMS 3.2 or greater (silly, but...)\r
 187                 or      ah,ah\r
 188                 jnz     error1\r
 189                 mov     [EMSVer],ax             //      set EMSVer\r
 190                 cmp     al,0x32                 // only work on ems 3.2 or greater\r
 191                 jb      error1\r
 192 \r
 193                 mov     ah,EMS_GETFRAME\r
 194                 int     EMS_INT                 // find the page frame address\r
 195                 or      ah,ah\r
 196                 jnz     error1\r
 197                 mov     [EMSPageFrame],bx\r
 198 \r
 199                 mov     ah,EMS_GETPAGES\r
 200                 int     EMS_INT                 // find out how much EMS is there\r
 201                 or      ah,ah\r
 202                 jnz     error1\r
 203                 or      bx,bx\r
 204                 jz      noEMS                   // no EMS at all to allocate\r
 205                 cmp     bx,2\r
 206                 jl      noEMS                   // Require at least 2 pages (32k)\r
 207                 mov     [totalEMSpages],dx\r
 208                 mov     [freeEMSpages],bx\r
 209                 mov     [EMSAvail],bx\r
 210                 jmp End1\r
 211 #ifdef __BORLANDC__\r
 212         }\r
 213 #endif\r
 214         error1:\r
 215 #ifdef __BORLANDC__\r
 216         __asm {\r
 217 #endif\r
 218                 mov     err,ah\r
 219                 mov     errorflag,1\r
 220                 jmp End1\r
 221 #ifdef __BORLANDC__\r
 222         }\r
 223 #endif\r
 224 noEMS:\r
 225 End1:\r
 226 #ifdef __WATCOMC__\r
 227         }\r
 228 #endif\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 += gvar->pm.emm.EMSAvail * (long)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(EMSPresent);\r
 281         }\r
 282 \r
 283         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 \r
 289         return(EMSPresent);\r
 290 }\r
 291 \r
 292 //\r
 293 //      PML_ShutdownEMS() - If EMS was used, deallocate it\r
 294 //\r
 295 void\r
 296 PML_ShutdownEMS(global_game_variables_t *gvar)\r
 297 {\r
 298         word EMSHandle;\r
 299         EMSHandle=gvar->pm.emm.EMSHandle;\r
 300 \r
 301         if (EMSPresent)\r
 302         {\r
 303                 __asm {\r
 304                         mov     ah,EMS_FREEPAGES\r
 305                         mov     dx,[EMSHandle]\r
 306                         int     EMS_INT\r
 307                 }\r
 308                 if (_AH)\r
 309                 {\r
 310                         Quit("PML_ShutdownEMS: Error freeing EMS\n");\r
 311                         //return;\r
 312                 }\r
 313         }\r
 314 }\r
 315 \r
 316 /////////////////////////////////////////////////////////////////////////////\r
 317 //\r
 318 //      XMS Management code\r
 319 //\r
 320 /////////////////////////////////////////////////////////////////////////////\r
 321 \r
 322 //\r
 323 //      PML_StartupXMS() - Starts up XMS for the Page Mgr's use\r
 324 //              Checks for presence of an XMS driver\r
 325 //              Makes sure that there's at least a page of XMS available\r
 326 //              Allocates any remaining XMS (rounded down to the nearest page size)\r
 327 //\r
 328 boolean\r
 329 PML_StartupXMS(global_game_variables_t *gvar)\r
 330 {\r
 331         XMSPresent = false;                                     // Assume failure\r
 332         gvar->pm.xmm.XMSAvail = 0;\r
 333 \r
 334         _AX=0x4300;\r
 335         geninterrupt(XMS_INT);                                  // Check for presence of XMS driver\r
 336         if (_AL != 0x80)\r
 337                 goto error;\r
 338 \r
 339 \r
 340         __asm {\r
 341                 mov     ax,0x4310\r
 342                 int     XMS_INT                                                 // Get address of XMS driver\r
 343                 mov     [WORD PTR XMSDriver],bx\r
 344                 mov     [WORD PTR XMSDriver+2],es               // function pointer to XMS driver\r
 345         }\r
 346 \r
 347         XMS_CALL(XMS_QUERYFREE);                        // Find out how much XMS is available\r
 348         gvar->pm.xmm.XMSAvail = _AX;\r
 349         if (!_AX)                               // AJR: bugfix 10/8/92\r
 350                 goto error;\r
 351 \r
 352         gvar->pm.xmm.XMSAvail &= ~(PMPageSizeKB - 1);   // Round off to nearest page size\r
 353         if (gvar->pm.xmm.XMSAvail < (PMPageSizeKB * 2)) // Need at least 2 pages\r
 354                 goto error;\r
 355 \r
 356         _DX = gvar->pm.xmm.XMSAvail;\r
 357         XMS_CALL(XMS_ALLOC);                            // And do the allocation\r
 358         gvar->pm.xmm.XMSHandle = _DX;\r
 359 \r
 360         if (!_AX)                               // AJR: bugfix 10/8/92\r
 361         {\r
 362                 gvar->pm.xmm.XMSAvail = 0;\r
 363                 goto error;\r
 364         }\r
 365 \r
 366         gvar->mmi.XMSmem += gvar->pm.xmm.XMSAvail * 1024;\r
 367 \r
 368         XMSPresent = true;\r
 369 error:\r
 370         return(XMSPresent);\r
 371 }\r
 372 \r
 373 //\r
 374 //      PML_XMSCopy() - Copies a main/EMS page to or from XMS\r
 375 //              Will round an odd-length request up to the next even value\r
 376 //\r
 377 void\r
 378 PML_XMSCopy(boolean toxms,byte far *addr,word xmspage,word length, global_game_variables_t *gvar)\r
 379 {\r
 380         dword   xoffset;\r
 381         struct\r
 382         {\r
 383                 dword   length;\r
 384                 word            source_handle;\r
 385                 dword   source_offset;\r
 386                 word            target_handle;\r
 387                 dword   target_offset;\r
 388         } copy;\r
 389 \r
 390         if (!addr)\r
 391         {\r
 392                 Quit("PML_XMSCopy: zero address\n");\r
 393                 //return;\r
 394         }\r
 395 \r
 396         xoffset = (dword)xmspage * PMPageSize;\r
 397 \r
 398         copy.length = (length + 1) & ~1;\r
 399         copy.source_handle = toxms? 0 : gvar->pm.xmm.XMSHandle;\r
 400         copy.source_offset = toxms? (long)addr : xoffset;\r
 401         copy.target_handle = toxms? gvar->pm.xmm.XMSHandle : 0;\r
 402         copy.target_offset = toxms? xoffset : (long)addr;\r
 403 \r
 404         __asm {\r
 405                 push si\r
 406         }\r
 407         _SI = (word)&copy;\r
 408         XMS_CALL(XMS_MOVE);\r
 409         __asm {\r
 410                 pop     si\r
 411         }\r
 412         if (!_AX)\r
 413         {\r
 414                 Quit("PML_XMSCopy: Error on copy");\r
 415                 //return;\r
 416         }\r
 417 }\r
 418 \r
 419 #if 1\r
 420 #define PML_CopyToXMS(s,t,l,gvar)       PML_XMSCopy(true,(s),(t),(l),(gvar))\r
 421 #define PML_CopyFromXMS(t,s,l,gvar)     PML_XMSCopy(false,(t),(s),(l),(gvar))\r
 422 #else\r
 423 //\r
 424 //      PML_CopyToXMS() - Copies the specified number of bytes from the real mode\r
 425 //              segment address to the specified XMS page\r
 426 //\r
 427 void\r
 428 PML_CopyToXMS(byte far *source,int targetpage,word length,global_game_variables_t *gvar)\r
 429 {\r
 430         PML_XMSCopy(true,source,targetpage,length, global_game_variables_t *gvar);\r
 431 }\r
 432 \r
 433 //\r
 434 //      PML_CopyFromXMS() - Copies the specified number of bytes from an XMS\r
 435 //              page to the specified real mode address\r
 436 //\r
 437 void\r
 438 PML_CopyFromXMS(byte far *target,int sourcepage,word length, global_game_variables_t *gvar)\r
 439 {\r
 440         PML_XMSCopy(false,target,sourcepage,length, global_game_variables_t *gvar);\r
 441 }\r
 442 #endif\r
 443 \r
 444 //\r
 445 //      PML_ShutdownXMS()\r
 446 //\r
 447 void\r
 448 PML_ShutdownXMS(global_game_variables_t *gvar)\r
 449 {\r
 450         if (XMSPresent)\r
 451         {\r
 452                 _DX = gvar->pm.xmm.XMSHandle;\r
 453                 XMS_CALL(XMS_FREE);\r
 454                 if (_BL)\r
 455                 {\r
 456                         Quit("PML_ShutdownXMS: Error freeing XMS");\r
 457                         //return;\r
 458                 }\r
 459         }\r
 460 }\r
 461 \r
 462 /////////////////////////////////////////////////////////////////////////////\r
 463 //\r
 464 //      Main memory code\r
 465 //\r
 466 /////////////////////////////////////////////////////////////////////////////\r
 467 \r
 468 //\r
 469 //      PM_SetMainMemPurge() - Sets the purge level for all allocated main memory\r
 470 //              blocks. This shouldn't be called directly - the PM_LockMainMem() and\r
 471 //              PM_UnlockMainMem() macros should be used instead.\r
 472 //\r
 473 void\r
 474 PM_SetMainMemPurge(int level, global_game_variables_t *gvar)\r
 475 {\r
 476         int     i;\r
 477 \r
 478         if(MainPresent)\r
 479         for (i = 0;i < PMMaxMainMem;i++)\r
 480         {\r
 481 #ifdef __DEBUG_PM__\r
 482                 printf("PM_SetMainMemPurge()    info of gvar->pm.mm.MainMemPages[i]\n");\r
 483                 //printf("      %Fp,    %Fp\n", gvar->pm.mm.MainMemPages[i],            (gvar->pm.mm.MainMemPages[i]));\r
 484                 printf("&       %Fp,    %Fp\n", &gvar->pm.mm.MainMemPages[i],   &(gvar->pm.mm.MainMemPages[i]));\r
 485                 //MM_ShowMemory(gvar);\r
 486                 //MM_DumpData(gvar);\r
 487                 //MM_Report_(gvar);\r
 488 #endif\r
 489                 if (gvar->pm.mm.MainMemPages[i])\r
 490                         MM_SetPurge(&(gvar->pm.mm.MainMemPages[i]),level, gvar);\r
 491         }\r
 492 \r
 493         else\r
 494         {\r
 495                 printf("MainPresent IS NULL\n");\r
 496                 printf("%x      ", MainPresent);\r
 497                 exit(-4);\r
 498         }\r
 499 }\r
 500 \r
 501 //\r
 502 //      PM_CheckMainMem() - If something besides the Page Mgr makes requests of\r
 503 //              the Memory Mgr, some of the Page Mgr's blocks may have been purged,\r
 504 //              so this function runs through the block list and checks to see if\r
 505 //              any of the blocks have been purged. If so, it marks the corresponding\r
 506 //              page as purged & unlocked, then goes through the block list and\r
 507 //              tries to reallocate any blocks that have been purged.\r
 508 //      This routine now calls PM_LockMainMem() to make sure that any allocation\r
 509 //              attempts made during the block reallocation sweep don't purge any\r
 510 //              of the other blocks. Because PM_LockMainMem() is called,\r
 511 //              PM_UnlockMainMem() needs to be called before any other part of the\r
 512 //              program makes allocation requests of the Memory Mgr.\r
 513 //\r
 514 void\r
 515 PM_CheckMainMem(global_game_variables_t *gvar)\r
 516 {\r
 517         boolean                 allocfailed;\r
 518         int                             i,n;\r
 519         memptr                  *p;\r
 520         PMBlockAttr             *used;\r
 521         PageListStruct  far *page;\r
 522 \r
 523         if (!MainPresent)\r
 524                 return;\r
 525 \r
 526         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 527         {\r
 528                 n = page->mainPage;\r
 529                 if (n != -1)                                            // Is the page using main memory?\r
 530                 {\r
 531                         if (!gvar->pm.mm.MainMemPages[n])                       // Yep, was the block purged?\r
 532                         {\r
 533                                 page->mainPage = -1;            // Yes, mark page as purged & unlocked\r
 534                                 page->locked = pml_Unlocked;\r
 535                         }\r
 536                 }\r
 537         }\r
 538 \r
 539         // Prevent allocation attempts from purging any of our other blocks\r
 540         PM_LockMainMem(gvar);\r
 541         allocfailed = false;\r
 542         for (i = 0,p = gvar->pm.mm.MainMemPages,used = gvar->pm.mm.MainMemUsed; i < PMMaxMainMem;i++,p++,used++)\r
 543         {\r
 544                 if (!*p)                                                        // If the page got purged\r
 545                 {\r
 546                         if (*used & pmba_Allocated)             // If it was allocated\r
 547                         {\r
 548                                 *used &= ~pmba_Allocated;       // Mark as unallocated\r
 549                                 gvar->pm.mm.MainPagesAvail--;                   // and decrease available count\r
 550                         }\r
 551 \r
 552                         if (*used & pmba_Used)                  // If it was used\r
 553                         {\r
 554                                 *used &= ~pmba_Used;            // Mark as unused\r
 555                                 gvar->pm.MainPagesUsed--;                       // and decrease used count\r
 556                         }\r
 557 \r
 558                         if (!allocfailed)\r
 559                         {\r
 560                                 MM_BombOnError(false, gvar);\r
 561                                 MM_GetPtr(p,PMPageSize, gvar);          // Try to reallocate\r
 562                                 if (gvar->mm.mmerror)                                   // If it failed,\r
 563                                         allocfailed = true;                     //  don't try any more allocations\r
 564                                 else                                                    // If it worked,\r
 565                                 {\r
 566                                         *used |= pmba_Allocated;        // Mark as allocated\r
 567                                         gvar->pm.mm.MainPagesAvail++;                   // and increase available count\r
 568                                 }\r
 569                                 MM_BombOnError(true, gvar);\r
 570                         }\r
 571                 }\r
 572         }\r
 573         if (gvar->mm.mmerror)\r
 574                 gvar->mm.mmerror = false;\r
 575 }\r
 576 \r
 577 //\r
 578 //      PML_StartupMainMem() - Allocates as much main memory as is possible for\r
 579 //              the Page Mgr. The memory is allocated as non-purgeable, so if it's\r
 580 //              necessary to make requests of the Memory Mgr, PM_UnlockMainMem()\r
 581 //              needs to be called.\r
 582 //\r
 583 void\r
 584 PML_StartupMainMem(global_game_variables_t *gvar)\r
 585 {\r
 586         int             i,n;\r
 587         memptr  *p;\r
 588 \r
 589         gvar->pm.mm.MainPagesAvail = 0;\r
 590         MainPresent = false;\r
 591         MM_BombOnError(false, gvar);\r
 592         printf("PML_StartupMainMem()\n");\r
 593         printf("        p=%04x  MainMemPages=%04x\n", p, gvar->pm.mm.MainMemPages);\r
 594         printf("        p=%Fp   MainMemPages=%Fp\n", p, gvar->pm.mm.MainMemPages);\r
 595         for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)\r
 596         {\r
 597                 MM_GetPtr(p,PMPageSize, gvar);\r
 598                 if (gvar->mm.mmerror)\r
 599                         break;\r
 600 \r
 601                 gvar->pm.mm.MainPagesAvail++;\r
 602                 gvar->pm.mm.MainMemUsed[i] = pmba_Allocated;\r
 603         }\r
 604         MM_BombOnError(true, gvar);\r
 605         if (gvar->mm.mmerror)\r
 606                 gvar->mm.mmerror = false;\r
 607         if (gvar->pm.mm.MainPagesAvail < PMMinMainMem)\r
 608         {\r
 609                 Quit("PM_SetupMainMem: Not enough main memory");\r
 610                 //return;\r
 611         }\r
 612         MainPresent = true;\r
 613 }\r
 614 \r
 615 //\r
 616 //      PML_ShutdownMainMem() - Frees all of the main memory blocks used by the\r
 617 //              Page Mgr.\r
 618 //\r
 619 void\r
 620 PML_ShutdownMainMem(global_game_variables_t *gvar)\r
 621 {\r
 622         int             i;\r
 623         memptr  *p;\r
 624 \r
 625         // DEBUG - mark pages as unallocated & decrease page count as appropriate\r
 626         for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)\r
 627                 if (*p)\r
 628                         MM_FreePtr(p, gvar);\r
 629 }\r
 630 \r
 631 /////////////////////////////////////////////////////////////////////////////\r
 632 //\r
 633 //      File management code\r
 634 //\r
 635 /////////////////////////////////////////////////////////////////////////////\r
 636 \r
 637 //\r
 638 //      PML_ReadFromFile() - Reads some data in from the page file\r
 639 //\r
 640 void\r
 641 PML_ReadFromFile(byte far *buf,long offset,word length, global_game_variables_t *gvar)\r
 642 {\r
 643         if (!buf)\r
 644         {\r
 645                 Quit("PML_ReadFromFile: Null pointer");\r
 646                 //return;\r
 647         }\r
 648         if (!offset)\r
 649         {\r
 650                 Quit("PML_ReadFromFile: Zero offset");\r
 651                 //return;\r
 652         }\r
 653         if (lseek(gvar->pm.fi.PageFile,offset,SEEK_SET) != offset)\r
 654         {\r
 655                 Quit("PML_ReadFromFile: Seek failed");\r
 656                 //return;\r
 657         }\r
 658         if (!CA_FarRead(gvar->pm.fi.PageFile,buf,length, gvar))\r
 659         {\r
 660                 Quit("PML_ReadFromFile: Read failed");\r
 661                 //return;\r
 662         }\r
 663 }\r
 664 \r
 665 //\r
 666 //      PML_OpenPageFile() - Opens the page file and sets up the page info\r
 667 //\r
 668 void\r
 669 PML_OpenPageFile(global_game_variables_t *gvar)\r
 670 {\r
 671         int                             i;\r
 672         long                    size;\r
 673                                 //__SEGA buf;\r
 674         memptr          buf;\r
 675         dword           far *offsetptr;\r
 676         word                    far *lengthptr;\r
 677         PageListStruct  far *page;\r
 678 \r
 679         gvar->pm.fi.PageFile = open(gvar->pm.fi.PageFileName,O_RDONLY + O_BINARY);\r
 680         if (gvar->pm.fi.PageFile == -1)\r
 681         {\r
 682                 Quit("PML_OpenPageFile: Unable to open page file");\r
 683                 //return;\r
 684         }\r
 685 \r
 686         // Read in header variables\r
 687         read(gvar->pm.fi.PageFile,&gvar->pm.fi.ChunksInFile,sizeof(gvar->pm.fi.ChunksInFile));\r
 688         read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSpriteStart,sizeof(gvar->pm.fi.PMSpriteStart));\r
 689         read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSoundStart,sizeof(gvar->pm.fi.PMSoundStart));\r
 690 \r
 691         // Allocate and clear the page list\r
 692         gvar->pm.PMNumBlocks = gvar->pm.fi.ChunksInFile;\r
 693         MM_GetPtr((memptr *)gvar->pm.PMSegPages, sizeof(PageListStruct) * (gvar->pm.PMNumBlocks), gvar);\r
 694         MM_SetLock((memptr *)gvar->pm.PMSegPages,true, gvar);\r
 695         gvar->pm.PMPages = (PageListStruct far *)gvar->pm.PMSegPages;\r
 696         _fmemset(gvar->pm.PMPages,0,sizeof(PageListStruct) * gvar->pm.PMNumBlocks);\r
 697 \r
 698         // Read in the chunk offsets\r
 699         size = sizeof(dword) * gvar->pm.fi.ChunksInFile;\r
 700         MM_GetPtr(&buf, size, gvar);\r
 701         if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))\r
 702         {\r
 703                 Quit("PML_OpenPageFile: Offset read failed");\r
 704                 //return;\r
 705         }\r
 706         offsetptr = (dword far *)buf;\r
 707         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 708                 page->offset = *offsetptr++;\r
 709         MM_FreePtr(&buf, gvar);\r
 710 \r
 711         // Read in the chunk lengths\r
 712         size = sizeof(word) * gvar->pm.fi.ChunksInFile;\r
 713         MM_GetPtr(&buf,size, gvar);\r
 714         if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))\r
 715         {\r
 716                 Quit("PML_OpenPageFile: Length read failed");\r
 717                 //return;\r
 718         }\r
 719         lengthptr = (word far *)buf;\r
 720         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 721                 page->length = *lengthptr++;\r
 722         MM_FreePtr(&buf, gvar);\r
 723 }\r
 724 \r
 725 //\r
 726 //  PML_ClosePageFile() - Closes the page file\r
 727 //\r
 728 void\r
 729 PML_ClosePageFile(global_game_variables_t *gvar)\r
 730 {\r
 731         if (gvar->pm.fi.PageFile != -1)\r
 732                 close(gvar->pm.fi.PageFile);\r
 733         if (gvar->pm.PMSegPages)\r
 734         {\r
 735                 MM_SetLock((memptr)gvar->pm.PMSegPages,false, gvar);\r
 736                 MM_FreePtr((memptr)gvar->pm.PMSegPages, gvar);\r
 737         }\r
 738 }\r
 739 \r
 740 /////////////////////////////////////////////////////////////////////////////\r
 741 //\r
 742 //      Allocation, etc., code\r
 743 //\r
 744 /////////////////////////////////////////////////////////////////////////////\r
 745 \r
 746 //\r
 747 //      PML_GetEMSAddress()\r
 748 //\r
 749 //              Page is in EMS, so figure out which EMS physical page should be used\r
 750 //              to map our page in. If normal page, use EMS physical page 3, else\r
 751 //              use the physical page specified by the lock type\r
 752 //\r
 753 #ifndef __DEBUG_2__\r
 754 #pragma argsused        // DEBUG - remove lock parameter\r
 755 memptr\r
 756 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)\r
 757 {\r
 758         int             i,emspage;\r
 759         word    emsoff,emsbase,offset;\r
 760 \r
 761         emsoff = page & (PMEMSSubPage - 1);\r
 762         emsbase = page - emsoff;\r
 763 \r
 764         emspage = -1;\r
 765         // See if this page is already mapped in\r
 766         for (i = 0;i < EMSFrameCount;i++)\r
 767         {\r
 768                 if (gvar->pm.emm.EMSList[i].baseEMSPage == emsbase)\r
 769                 {\r
 770                         emspage = i;    // Yep - don't do a redundant remapping\r
 771                         break;\r
 772                 }\r
 773         }\r
 774 \r
 775         // If page isn't already mapped in, find LRU EMS frame, and use it\r
 776         if (emspage == -1)\r
 777         {\r
 778                 dword last = LONG_MAX;\r
 779                 for (i = 0;i < EMSFrameCount;i++)\r
 780                 {\r
 781                         if (gvar->pm.emm.EMSList[i].lastHit < last)\r
 782                         {\r
 783                                 emspage = i;\r
 784                                 last = gvar->pm.emm.EMSList[i].lastHit;\r
 785                         }\r
 786                 }\r
 787 \r
 788                 gvar->pm.emm.EMSList[emspage].baseEMSPage = emsbase;\r
 789                 PML_MapEMS(page / PMEMSSubPage,emspage, gvar);\r
 790         }\r
 791 \r
 792         if (emspage == -1)\r
 793                 Quit("PML_GetEMSAddress: EMS find failed");\r
 794 \r
 795         gvar->pm.emm.EMSList[emspage].lastHit = gvar->pm.PMFrameCount;\r
 796         offset = emspage * EMSPageSizeSeg;\r
 797         offset += emsoff * PMPageSizeSeg;\r
 798         return((memptr)(gvar->pm.emm.EMSPageFrame + offset));\r
 799 }\r
 800 #else\r
 801 memptr\r
 802 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)\r
 803 {\r
 804         word    emspage;\r
 805 \r
 806         emspage = (lock < pml_EMSLock)? 3 : (lock - pml_EMSLock);\r
 807 \r
 808         PML_MapEMS(page / PMEMSSubPage,emspage);\r
 809 \r
 810         return((memptr)(EMSPageFrame + (emspage * EMSPageSizeSeg)\r
 811                         + ((page & (PMEMSSubPage - 1)) * PMPageSizeSeg)));\r
 812 }\r
 813 #endif\r
 814 \r
 815 //\r
 816 //      PM_GetPageAddress() - Returns the address of a given page\r
 817 //              Maps in EMS if necessary\r
 818 //              Returns nil if block isn't cached into Main Memory or EMS\r
 819 //\r
 820 //\r
 821 memptr\r
 822 PM_GetPageAddress(int pagenum, global_game_variables_t *gvar)\r
 823 {\r
 824         PageListStruct  far *page;\r
 825 \r
 826         page = &gvar->pm.PMPages[pagenum];\r
 827         if (page->mainPage != -1)\r
 828                 return(gvar->pm.mm.MainMemPages[page->mainPage]);\r
 829         else if (page->emsPage != -1)\r
 830                 return(PML_GetEMSAddress(page->emsPage,page->locked, gvar));\r
 831         else\r
 832                 return(nil);\r
 833 }\r
 834 \r
 835 //\r
 836 //      PML_GiveLRUPage() - Returns the page # of the least recently used\r
 837 //              present & unlocked main/EMS page (or main page if mainonly is true)\r
 838 //\r
 839 int\r
 840 PML_GiveLRUPage(boolean mainonly, global_game_variables_t *gvar)\r
 841 {\r
 842         int                             i,lru;\r
 843         long                    last;\r
 844         PageListStruct  far *page;\r
 845 \r
 846         for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 847         {\r
 848                 if\r
 849                 (\r
 850                         (page->lastHit < last)\r
 851                 &&      ((page->emsPage != -1) || (page->mainPage != -1))\r
 852                 &&      (page->locked == pml_Unlocked)\r
 853                 &&      (!(mainonly && (page->mainPage == -1)))\r
 854                 )\r
 855                 {\r
 856                         last = page->lastHit;\r
 857                         lru = i;\r
 858                 }\r
 859         }\r
 860 \r
 861         if (lru == -1)\r
 862                 Quit("PML_GiveLRUPage: LRU Search failed");\r
 863         return(lru);\r
 864 }\r
 865 \r
 866 //\r
 867 //      PML_GiveLRUXMSPage() - Returns the page # of the least recently used\r
 868 //              (and present) XMS page.\r
 869 //      This routine won't return the XMS page protected (by XMSProtectPage)\r
 870 //\r
 871 int\r
 872 PML_GiveLRUXMSPage(global_game_variables_t *gvar)\r
 873 {\r
 874         int                             i,lru;\r
 875         long                    last;\r
 876         PageListStruct  far *page;\r
 877 \r
 878         for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 879         {\r
 880                 if\r
 881                 (\r
 882                         (page->xmsPage != -1)\r
 883                 &&      (page->lastHit < last)\r
 884                 &&      (i != gvar->pm.xmm.XMSProtectPage)\r
 885                 )\r
 886                 {\r
 887                         last = page->lastHit;\r
 888                         lru = i;\r
 889                 }\r
 890         }\r
 891         return(lru);\r
 892 }\r
 893 \r
 894 //\r
 895 //      PML_PutPageInXMS() - If page isn't in XMS, find LRU XMS page and replace\r
 896 //              it with the main/EMS page\r
 897 //\r
 898 void\r
 899 PML_PutPageInXMS(int pagenum, global_game_variables_t *gvar)\r
 900 {\r
 901         int                             usexms;\r
 902         PageListStruct  far *page;\r
 903 \r
 904         if (!XMSPresent)\r
 905                 return;\r
 906 \r
 907         page = &gvar->pm.PMPages[pagenum];\r
 908         if (page->xmsPage != -1)\r
 909                 return;                                 // Already in XMS\r
 910 \r
 911         if (gvar->pm.XMSPagesUsed < gvar->pm.xmm.XMSPagesAvail)\r
 912                 page->xmsPage = gvar->pm.XMSPagesUsed++;\r
 913         else\r
 914         {\r
 915                 usexms = PML_GiveLRUXMSPage(gvar);\r
 916                 if (usexms == -1)\r
 917                         Quit("PML_PutPageInXMS: No XMS LRU");\r
 918                 page->xmsPage = gvar->pm.PMPages[usexms].xmsPage;\r
 919                 gvar->pm.PMPages[usexms].xmsPage = -1;\r
 920         }\r
 921         PML_CopyToXMS(PM_GetPageAddress(pagenum, gvar),page->xmsPage,page->length, gvar);\r
 922 }\r
 923 \r
 924 //\r
 925 //      PML_TransferPageSpace() - A page is being replaced, so give the new page\r
 926 //              the old one's address space. Returns the address of the new page.\r
 927 //\r
 928 memptr\r
 929 PML_TransferPageSpace(int orig,int new, global_game_variables_t *gvar)\r
 930 {\r
 931         memptr                  addr;\r
 932         PageListStruct  far *origpage,far *newpage;\r
 933 \r
 934         if (orig == new)\r
 935                 Quit("PML_TransferPageSpace: Identity replacement");\r
 936 \r
 937         origpage = &gvar->pm.PMPages[orig];\r
 938         newpage = &gvar->pm.PMPages[new];\r
 939 \r
 940         if (origpage->locked != pml_Unlocked)\r
 941                 Quit("PML_TransferPageSpace: Killing locked page");\r
 942 \r
 943         if ((origpage->emsPage == -1) && (origpage->mainPage == -1))\r
 944                 Quit("PML_TransferPageSpace: Reusing non-existent page");\r
 945 \r
 946         // Copy page that's about to be purged into XMS\r
 947         PML_PutPageInXMS(orig, gvar);\r
 948 \r
 949         // Get the address, and force EMS into a physical page if necessary\r
 950         addr = PM_GetPageAddress(orig, gvar);\r
 951 \r
 952         // Steal the address\r
 953         newpage->emsPage = origpage->emsPage;\r
 954         newpage->mainPage = origpage->mainPage;\r
 955 \r
 956         // Mark replaced page as purged\r
 957         origpage->mainPage = origpage->emsPage = -1;\r
 958 \r
 959         if (!addr)\r
 960                 Quit("PML_TransferPageSpace: Zero replacement");\r
 961 \r
 962         return(addr);\r
 963 }\r
 964 \r
 965 //\r
 966 //      PML_GetAPageBuffer() - A page buffer is needed. Either get it from the\r
 967 //              main/EMS free pool, or use PML_GiveLRUPage() to find which page to\r
 968 //              steal the buffer from. Returns a far pointer to the page buffer, and\r
 969 //              sets the fields inside the given page structure appropriately.\r
 970 //              If mainonly is true, free EMS will be ignored, and only main pages\r
 971 //              will be looked at by PML_GiveLRUPage().\r
 972 //\r
 973 byte far *\r
 974 PML_GetAPageBuffer(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
 975 {\r
 976         byte                    far *addr = nil;\r
 977         int                             i,n;\r
 978         PMBlockAttr             *used;\r
 979         PageListStruct  far *page;\r
 980 \r
 981         page = &gvar->pm.PMPages[pagenum];\r
 982         if ((gvar->pm.EMSPagesUsed < gvar->pm.emm.EMSPagesAvail) && !mainonly)\r
 983         {\r
 984                 // There's remaining EMS - use it\r
 985                 page->emsPage = gvar->pm.EMSPagesUsed++;\r
 986                 addr = PML_GetEMSAddress(page->emsPage,page->locked, gvar);\r
 987         }\r
 988         else if (gvar->pm.MainPagesUsed < gvar->pm.mm.MainPagesAvail)\r
 989         {\r
 990                 // There's remaining main memory - use it\r
 991                 for (i = 0,n = -1,used = gvar->pm.mm.MainMemUsed;i < PMMaxMainMem;i++,used++)\r
 992                 {\r
 993                         if ((*used & pmba_Allocated) && !(*used & pmba_Used))\r
 994                         {\r
 995                                 n = i;\r
 996                                 *used |= pmba_Used;\r
 997                                 break;\r
 998                         }\r
 999                 }\r
1000                 if (n == -1)\r
1001                         Quit("PML_GetPageBuffer: MainPagesAvail lied");\r
1002                 addr = gvar->pm.mm.MainMemPages[n];\r
1003                 if (!addr)\r
1004                         Quit("PML_GetPageBuffer: Purged main block");\r
1005                 page->mainPage = n;\r
1006                 gvar->pm.MainPagesUsed++;\r
1007         }\r
1008         else\r
1009                 addr = PML_TransferPageSpace(PML_GiveLRUPage(mainonly, gvar),pagenum, gvar);\r
1010 \r
1011         if (!addr)\r
1012                 Quit("PML_GetPageBuffer: Search failed");\r
1013         return(addr);\r
1014 }\r
1015 \r
1016 //\r
1017 //      PML_GetPageFromXMS() - If page is in XMS, find LRU main/EMS page and\r
1018 //              replace it with the page from XMS. If mainonly is true, will only\r
1019 //              search for LRU main page.\r
1020 //      XMSProtectPage is set to the page to be retrieved from XMS, so that if\r
1021 //              the page from which we're stealing the main/EMS from isn't in XMS,\r
1022 //              it won't copy over the page that we're trying to get from XMS.\r
1023 //              (pages that are being purged are copied into XMS, if possible)\r
1024 //\r
1025 memptr\r
1026 PML_GetPageFromXMS(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
1027 {\r
1028         byte                    far *checkaddr;\r
1029         memptr                  addr = nil;\r
1030         PageListStruct  far *page;\r
1031 \r
1032         page = &gvar->pm.PMPages[pagenum];\r
1033         if (XMSPresent && (page->xmsPage != -1))\r
1034         {\r
1035                 gvar->pm.xmm.XMSProtectPage = pagenum;\r
1036                 checkaddr = PML_GetAPageBuffer(pagenum,mainonly, gvar);\r
1037                 if (FP_OFF(checkaddr))\r
1038                         Quit("PML_GetPageFromXMS: Non segment pointer");\r
1039                 addr = (memptr)FP_SEG(checkaddr);\r
1040                 PML_CopyFromXMS(addr,page->xmsPage,page->length, gvar);\r
1041                 gvar->pm.xmm.XMSProtectPage = -1;\r
1042         }\r
1043 \r
1044         return(addr);\r
1045 }\r
1046 \r
1047 //\r
1048 //      PML_LoadPage() - A page is not in main/EMS memory, and it's not in XMS.\r
1049 //              Load it into either main or EMS. If mainonly is true, the page will\r
1050 //              only be loaded into main.\r
1051 //\r
1052 void\r
1053 PML_LoadPage(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
1054 {\r
1055         byte                    far *addr;\r
1056         PageListStruct  far *page;\r
1057 \r
1058         addr = PML_GetAPageBuffer(pagenum,mainonly, gvar);\r
1059         page = &gvar->pm.PMPages[pagenum];\r
1060         PML_ReadFromFile(addr,page->offset,page->length, gvar);\r
1061 }\r
1062 \r
1063 //\r
1064 //      PM_GetPage() - Returns the address of the page, loading it if necessary\r
1065 //              First, check if in Main Memory or EMS\r
1066 //              Then, check XMS\r
1067 //              If not in XMS, load into Main Memory or EMS\r
1068 //\r
1069 #pragma warn -pia\r
1070 memptr\r
1071 PM_GetPage(int pagenum, global_game_variables_t *gvar)\r
1072 {\r
1073         memptr  result;\r
1074 \r
1075         if (pagenum >= gvar->pm.fi.ChunksInFile)\r
1076                 Quit("PM_GetPage: Invalid page request");\r
1077 \r
1078 #ifdef __DEBUG_2__      // for debugging\r
1079         __asm {\r
1080                 mov     dx,STATUS_REGISTER_1\r
1081                 in      al,dx\r
1082                 mov     dx,ATR_INDEX\r
1083                 mov     al,ATR_OVERSCAN\r
1084                 out     dx,al\r
1085                 mov     al,10   // bright green\r
1086                 out     dx,al\r
1087         }\r
1088 #endif\r
1089 \r
1090         if (!(result = PM_GetPageAddress(pagenum, gvar)))\r
1091         {\r
1092                 boolean mainonly = (pagenum >= gvar->pm.fi.PMSoundStart);\r
1093 if (!gvar->pm.PMPages[pagenum].offset)  // JDC: sparse page\r
1094         Quit ("Tried to load a sparse page!");\r
1095                 if (!(result = PML_GetPageFromXMS(pagenum,mainonly, gvar)))\r
1096                 {\r
1097                         if (gvar->pm.PMPages[pagenum].lastHit ==  gvar->pm.PMFrameCount)\r
1098                                 gvar->pm.PMThrashing++;\r
1099 \r
1100                         PML_LoadPage(pagenum,mainonly, gvar);\r
1101                         result = PM_GetPageAddress(pagenum, gvar);\r
1102                 }\r
1103         }\r
1104         gvar->pm.PMPages[pagenum].lastHit =  gvar->pm.PMFrameCount;\r
1105 \r
1106 #ifdef __DEBUG_2__      // for debugging\r
1107         __asm{\r
1108                 mov     dx,STATUS_REGISTER_1\r
1109                 in      al,dx\r
1110                 mov     dx,ATR_INDEX\r
1111                 mov     al,ATR_OVERSCAN\r
1112                 out     dx,al\r
1113                 mov     al,3    // blue\r
1114                 out     dx,al\r
1115                 mov     al,0x20 // normal\r
1116                 out     dx,al\r
1117 #endif\r
1118 \r
1119         return(result);\r
1120 }\r
1121 #pragma warn +pia\r
1122 \r
1123 //\r
1124 //      PM_SetPageLock() - Sets the lock type on a given page\r
1125 //              pml_Unlocked: Normal, page can be purged\r
1126 //              pml_Locked: Cannot be purged\r
1127 //              pml_EMS?: Same as pml_Locked, but if in EMS, use the physical page\r
1128 //                                      specified when returning the address. For sound stuff.\r
1129 //\r
1130 void\r
1131 PM_SetPageLock(int pagenum,PMLockType lock, global_game_variables_t *gvar)\r
1132 {\r
1133         if (pagenum < gvar->pm.fi.PMSoundStart)\r
1134                 Quit("PM_SetPageLock: Locking/unlocking non-sound page");\r
1135 \r
1136         gvar->pm.PMPages[pagenum].locked = lock;\r
1137 }\r
1138 \r
1139 //\r
1140 //      PM_Preload() - Loads as many pages as possible into all types of memory.\r
1141 //              Calls the update function after each load, indicating the current\r
1142 //              page, and the total pages that need to be loaded (for thermometer).\r
1143 //\r
1144 void\r
1145 PM_Preload(boolean (*update)(word current,word total), global_game_variables_t *gvar)\r
1146 {\r
1147         int                             i,j,\r
1148                                         page,oogypage;\r
1149         word                    current,total,\r
1150                                         totalnonxms,totalxms,\r
1151                                         mainfree,maintotal,\r
1152                                         emsfree,emstotal,\r
1153                                         xmsfree,xmstotal;\r
1154         memptr                  addr;\r
1155         PageListStruct  far *p;\r
1156 \r
1157         mainfree = (gvar->pm.mm.MainPagesAvail - gvar->pm.MainPagesUsed) + (gvar->pm.emm.EMSPagesAvail - gvar->pm.EMSPagesUsed);\r
1158         xmsfree = (gvar->pm.xmm.XMSPagesAvail - gvar->pm.XMSPagesUsed);\r
1159 \r
1160         xmstotal = maintotal = 0;\r
1161 \r
1162         for (i = 0;i < gvar->pm.fi.ChunksInFile;i++)\r
1163         {\r
1164                 if (!gvar->pm.PMPages[i].offset)\r
1165                         continue;                       // sparse\r
1166 \r
1167                 if ( gvar->pm.PMPages[i].emsPage != -1 || gvar->pm.PMPages[i].mainPage != -1 )\r
1168                         continue;                       // already in main mem\r
1169 \r
1170                 if ( mainfree )\r
1171                 {\r
1172                         maintotal++;\r
1173                         mainfree--;\r
1174                 }\r
1175                 else if ( xmsfree && (gvar->pm.PMPages[i].xmsPage == -1) )\r
1176                 {\r
1177                         xmstotal++;\r
1178                         xmsfree--;\r
1179                 }\r
1180         }\r
1181 \r
1182 \r
1183         total = maintotal + xmstotal;\r
1184 \r
1185         if (!total)\r
1186                 return;\r
1187 \r
1188         page = 0;\r
1189         current = 0;\r
1190 \r
1191 //\r
1192 // cache main/ems blocks\r
1193 //\r
1194         while (maintotal)\r
1195         {\r
1196                 while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].mainPage != -1\r
1197                         ||      gvar->pm.PMPages[page].emsPage != -1 )\r
1198                         page++;\r
1199 \r
1200                 if (page >= gvar->pm.fi.ChunksInFile)\r
1201                         Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");\r
1202 \r
1203                 PM_GetPage(page, gvar);\r
1204 \r
1205                 page++;\r
1206                 current++;\r
1207                 maintotal--;\r
1208                 update(current,total);\r
1209         }\r
1210 \r
1211 //\r
1212 // load stuff to XMS\r
1213 //\r
1214         if (xmstotal)\r
1215         {\r
1216                 for (oogypage = 0 ; gvar->pm.PMPages[oogypage].mainPage == -1 ; oogypage++)\r
1217                 ;\r
1218                 addr = PM_GetPage(oogypage, gvar);\r
1219                 if (!addr)\r
1220                         Quit("PM_Preload: XMS buffer failed");\r
1221 \r
1222                 while (xmstotal)\r
1223                 {\r
1224                         while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].xmsPage != -1 )\r
1225                                 page++;\r
1226 \r
1227                         if (page >= gvar->pm.fi.ChunksInFile)\r
1228                                 Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");\r
1229 \r
1230                         p = &gvar->pm.PMPages[page];\r
1231 \r
1232                         p->xmsPage = gvar->pm.XMSPagesUsed++;\r
1233                         if (gvar->pm.XMSPagesUsed > gvar->pm.xmm.XMSPagesAvail)\r
1234                                 Quit("PM_Preload: Exceeded XMS pages");\r
1235                         if (p->length > PMPageSize)\r
1236                                 Quit("PM_Preload: Page too long");\r
1237 \r
1238                         PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);\r
1239                         PML_CopyToXMS((byte far *)addr,p->xmsPage,p->length, gvar);\r
1240 \r
1241                         page++;\r
1242                         current++;\r
1243                         xmstotal--;\r
1244                         update(current,total);\r
1245                 }\r
1246 \r
1247                 p = &gvar->pm.PMPages[oogypage];\r
1248                 PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);\r
1249         }\r
1250 \r
1251         update(total,total);\r
1252 }\r
1253 \r
1254 /////////////////////////////////////////////////////////////////////////////\r
1255 //\r
1256 //      General code\r
1257 //\r
1258 /////////////////////////////////////////////////////////////////////////////\r
1259 \r
1260 //\r
1261 //      PM_NextFrame() - Increments the frame counter and adjusts the thrash\r
1262 //              avoidence variables\r
1263 //\r
1264 //              If currently in panic mode (to avoid thrashing), check to see if the\r
1265 //                      appropriate number of frames have passed since the last time that\r
1266 //                      we would have thrashed. If so, take us out of panic mode.\r
1267 //\r
1268 //\r
1269 void\r
1270 PM_NextFrame(global_game_variables_t *gvar)\r
1271 {\r
1272         int     i;\r
1273 \r
1274         // Frame count overrun - kill the LRU hit entries & reset frame count\r
1275         if (++gvar->pm.PMFrameCount >= LONG_MAX - 4)\r
1276         {\r
1277                 for (i = 0;i < gvar->pm.PMNumBlocks;i++)\r
1278                         gvar->pm.PMPages[i].lastHit = 0;\r
1279                 gvar->pm.PMFrameCount = 0;\r
1280         }\r
1281 \r
1282 //#if 0\r
1283         for (i = 0;i < gvar->pm.fi.PMSoundStart;i++)\r
1284         {\r
1285                 if (gvar->pm.PMPages[i].locked)\r
1286                 {\r
1287                         char buf[40];\r
1288                         sprintf(buf,"PM_NextFrame: Page %d is locked",i);\r
1289                         Quit(buf);\r
1290                 }\r
1291         }\r
1292 //#endif\r
1293 \r
1294         if (gvar->pm.PMPanicMode)\r
1295         {\r
1296                 // DEBUG - set border color\r
1297                 if ((!gvar->pm.PMThrashing) && (!--gvar->pm.PMPanicMode))\r
1298                 {\r
1299                         // DEBUG - reset border color\r
1300                 }\r
1301         }\r
1302         if (gvar->pm.PMThrashing >= PMThrashThreshold)\r
1303                 gvar->pm.PMPanicMode = PMUnThrashThreshold;\r
1304         gvar->pm.PMThrashing = false;\r
1305 }\r
1306 \r
1307 //\r
1308 //      PM_Reset() - Sets up caching structures\r
1309 //\r
1310 void\r
1311 PM_Reset(global_game_variables_t *gvar)\r
1312 {\r
1313         int                             i;\r
1314         PageListStruct  far *page;\r
1315 \r
1316         gvar->pm.xmm.XMSPagesAvail = gvar->pm.xmm.XMSAvail / PMPageSizeKB;\r
1317 \r
1318         gvar->pm.emm.EMSPagesAvail = gvar->pm.emm.EMSAvail * (EMSPageSizeKB / PMPageSizeKB);\r
1319         gvar->pm.emm.EMSPhysicalPage = 0;\r
1320 \r
1321         gvar->pm.MainPagesUsed = gvar->pm.EMSPagesUsed = gvar->pm.XMSPagesUsed = 0;\r
1322 \r
1323         gvar->pm.PMPanicMode = false;\r
1324 \r
1325         gvar->pm.fi.PageFile = -1;\r
1326         gvar->pm.xmm.XMSProtectPage = -1;\r
1327 \r
1328         // Initialize page list\r
1329         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.PMNumBlocks;i++,page++)\r
1330         {\r
1331                 page->mainPage = -1;\r
1332                 page->emsPage = -1;\r
1333                 page->xmsPage = -1;\r
1334                 page->locked = false;\r
1335         }\r
1336 }\r
1337 \r
1338 //\r
1339 //      PM_Startup() - Start up the Page Mgr\r
1340 //\r
1341 void\r
1342 PM_Startup(global_game_variables_t *gvar)\r
1343 {\r
1344         boolean nomain,noems,noxms;\r
1345         int             i;\r
1346 \r
1347         if (PMStarted)\r
1348         {\r
1349                 printf("pee\n");\r
1350                 return;\r
1351         }\r
1352 \r
1353         strcat(&(gvar->pm.fi.PageFileName), "VSWAP.");\r
1354 \r
1355         nomain = noems = noxms = false;\r
1356         for (i = 1;i <\r
1357 #ifdef __WATCOMC__\r
1358         __argc\r
1359 #endif\r
1360 #ifdef __BORLANDC__\r
1361         _argc\r
1362 #endif\r
1363         ;i++)\r
1364         {\r
1365                 switch (US_CheckParm(\r
1366 #ifdef __WATCOMC__\r
1367         __argv[i]\r
1368 #endif\r
1369 #ifdef __BORLANDC__\r
1370         _argv[i]\r
1371 #endif\r
1372                 ,ParmStrings))\r
1373                 {\r
1374                 case 0:\r
1375                         nomain = true;\r
1376                         break;\r
1377                 case 1:\r
1378                         noems = true;\r
1379                         break;\r
1380                 case 2:\r
1381                         noxms = true;\r
1382                         break;\r
1383                 }\r
1384         }\r
1385 \r
1386         PML_OpenPageFile(gvar);\r
1387 \r
1388         if (!noems)\r
1389                 PML_StartupEMS(gvar);\r
1390         if (!noxms)\r
1391                 PML_StartupXMS(gvar);\r
1392 \r
1393         if (nomain && !EMSPresent)\r
1394         {\r
1395                 Quit("PM_Startup: No main or EMS\n");\r
1396                 //return;\r
1397         }\r
1398         printf("PML_StartupMainMem\n");\r
1399         PML_StartupMainMem(gvar);\r
1400 \r
1401         PM_Reset(gvar);\r
1402 \r
1403         PMStarted = true;\r
1404 }\r
1405 \r
1406 //\r
1407 //      PM_Shutdown() - Shut down the Page Mgr\r
1408 //\r
1409 void\r
1410 PM_Shutdown(global_game_variables_t *gvar)\r
1411 {\r
1412         PML_ShutdownXMS(gvar);\r
1413         PML_ShutdownEMS(gvar);\r
1414 \r
1415         if (!PMStarted)\r
1416                 return;\r
1417 \r
1418         PML_ClosePageFile(gvar);\r
1419 \r
1420         PML_ShutdownMainMem(gvar);\r
1421 }\r