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 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    str[160];\r
  87         unsigned        EMShandle;\r
  88         byte err;\r
  89         boolean errorflag=false;\r
  90         int     i;\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     error\r
 101                 jmp End\r
 102 #ifdef __BORLANDC__\r
 103         }\r
 104 #endif\r
 105                 error:\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                 End:\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    str[64];\r
 144         byte err;\r
 145 \r
 146         boolean errorflag=0;\r
 147         static char     emmname[] = "EMMXXXX0"; //fix by andrius4669\r
 148         unsigned int EMSVer = 0;\r
 149         unsigned        totalEMSpages,freeEMSpages,EMSPageFrame,EMSHandle,EMSAvail;\r
 150         totalEMSpages = freeEMSpages = EMSPageFrame = 0;\r
 151         gvar->pm.emm.EMSPresent = false;                        // Assume that we'll fail\r
 152         gvar->pm.emm.EMSAvail = 0;\r
 153         gvar->mmi.EMSmem = 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 /*\r
 230         if(errorflag==false)\r
 231         {\r
 232                 // Don't hog all available EMS\r
 233                 size = gvar->pm.emm.EMSAvail * (long)EMSPageSize;\r
 234                 if (size - (EMSPageSize * 2) > (gvar->pm.fi.ChunksInFile * (long)PMPageSize))\r
 235                 {\r
 236                         size = (gvar->pm.fi.ChunksInFile * (long)PMPageSize) + EMSPageSize;\r
 237                         gvar->pm.emm.EMSAvail = size / EMSPageSize;\r
 238                 }\r
 239         }\r
 240 */\r
 241         __asm {\r
 242                 mov     ah,EMS_ALLOCPAGES\r
 243                 mov     bx,[EMSAvail];\r
 244                 int     EMS_INT\r
 245                 or      ah,ah\r
 246                 jnz     error2\r
 247                 mov     [EMSHandle],dx\r
 248                 jmp     End2\r
 249 #ifdef __BORLANDC__\r
 250         }\r
 251 #endif\r
 252         error2:\r
 253 #ifdef __BORLANDC__\r
 254         __asm {\r
 255 #endif\r
 256                 mov     err,ah\r
 257                 mov     errorflag,1\r
 258                 jmp End2\r
 259 #ifdef __BORLANDC__\r
 260         }\r
 261 #endif\r
 262 End2:\r
 263 #ifdef __WATCOMC__\r
 264         }\r
 265 #endif\r
 266 \r
 267         if(errorflag==false)\r
 268         {\r
 269         gvar->mmi.EMSmem += gvar->pm.emm.EMSAvail * (long)EMSPageSize;\r
 270 \r
 271         // Initialize EMS mapping cache\r
 272         for (i = 0;i < EMSFrameCount;i++)\r
 273                 gvar->pm.emm.EMSList[i].baseEMSPage = -1;\r
 274 \r
 275         }\r
 276         else\r
 277         {\r
 278                 strcpy(str,"PML_StartupEMS: EMS error ");\r
 279                 MM_EMSerr(str, err);\r
 280                 printf("%s\n",str);\r
 281                 return(gvar->pm.emm.EMSPresent);\r
 282         }\r
 283 \r
 284         gvar->pm.emm.EMSPresent = true;                 // We have EMS\r
 285         gvar->pm.emm.EMSPageFrame = EMSPageFrame;\r
 286         gvar->pm.emm.EMSAvail = EMSAvail;\r
 287         gvar->pm.emm.EMSVer = EMSVer;\r
 288         gvar->pm.emm.EMSHandle = EMSHandle;\r
 289         gvar->pm.emm.freeEMSpages = freeEMSpages;\r
 290         gvar->pm.emm.totalEMSpages = totalEMSpages;\r
 291 \r
 292         return(gvar->pm.emm.EMSPresent);\r
 293 }\r
 294 \r
 295 //\r
 296 //      PML_ShutdownEMS() - If EMS was used, deallocate it\r
 297 //\r
 298 void\r
 299 PML_ShutdownEMS(global_game_variables_t *gvar)\r
 300 {\r
 301         word EMSHandle;\r
 302         byte err;\r
 303         byte    str[64];\r
 304         boolean errorflag=false;\r
 305 \r
 306         EMSHandle=gvar->pm.emm.EMSHandle;\r
 307 \r
 308         if (gvar->pm.emm.EMSPresent)\r
 309         {\r
 310                 __asm {\r
 311                         mov     ah,EMS_FREEPAGES\r
 312                         mov     dx,[EMSHandle]\r
 313                         int     EMS_INT\r
 314                         jc      errors\r
 315                         jmp     Ends\r
 316 #ifdef __BORLANDC__\r
 317                 }\r
 318 #endif\r
 319                         errors:\r
 320 #ifdef __BORLANDC__\r
 321                 __asm {\r
 322 #endif\r
 323                         mov     err,ah\r
 324                         mov     errorflag,1\r
 325                         jmp Ends\r
 326 #ifdef __BORLANDC__\r
 327                 }\r
 328 #endif\r
 329                 Ends:\r
 330 #ifdef __WATCOMC__\r
 331                 }\r
 332 #endif\r
 333                 if(errorflag==true)\r
 334                 {\r
 335                         strcpy(str,"PML_ShutdownEMS: Error freeing EMS ");\r
 336                         MM_EMSerr(str, err);\r
 337                         printf("%s\n",str);\r
 338                         Quit("PML_ShutdownEMS: Error freeing EMS\n");\r
 339                         //return;\r
 340                 }\r
 341         }\r
 342 }\r
 343 \r
 344 /////////////////////////////////////////////////////////////////////////////\r
 345 //\r
 346 //      XMS Management code\r
 347 //\r
 348 /////////////////////////////////////////////////////////////////////////////\r
 349 \r
 350 //\r
 351 //      PML_StartupXMS() - Starts up XMS for the Page Mgr's use\r
 352 //              Checks for presence of an XMS driver\r
 353 //              Makes sure that there's at least a page of XMS available\r
 354 //              Allocates any remaining XMS (rounded down to the nearest page size)\r
 355 //\r
 356 boolean\r
 357 PML_StartupXMS(global_game_variables_t *gvar)\r
 358 {\r
 359         gvar->pm.xmm.XMSPresent = false;                                        // Assume failure\r
 360         gvar->pm.xmm.XMSAvail = 0;\r
 361 \r
 362         _AX=0x4300;\r
 363         geninterrupt(XMS_INT);                                  // Check for presence of XMS driver\r
 364         if (_AL != 0x80)\r
 365                 goto error;\r
 366 \r
 367 \r
 368         __asm {\r
 369                 mov     ax,0x4310\r
 370                 int     XMS_INT                                                 // Get address of XMS driver\r
 371                 mov     [WORD PTR XMSDriver],bx\r
 372                 mov     [WORD PTR XMSDriver+2],es               // function pointer to XMS driver\r
 373         }\r
 374 \r
 375         XMS_CALL(XMS_QUERYFREE);                        // Find out how much XMS is available\r
 376         gvar->pm.xmm.XMSAvail = _AX;\r
 377         if (!_AX)                               // AJR: bugfix 10/8/92\r
 378                 goto error;\r
 379 \r
 380         gvar->pm.xmm.XMSAvail &= ~(PMPageSizeKB - 1);   // Round off to nearest page size\r
 381         if (gvar->pm.xmm.XMSAvail < (PMPageSizeKB * 2)) // Need at least 2 pages\r
 382                 goto error;\r
 383 \r
 384         _DX = gvar->pm.xmm.XMSAvail;\r
 385         XMS_CALL(XMS_ALLOC);                            // And do the allocation\r
 386         gvar->pm.xmm.XMSHandle = _DX;\r
 387 \r
 388         if (!_AX)                               // AJR: bugfix 10/8/92\r
 389         {\r
 390                 gvar->pm.xmm.XMSAvail = 0;\r
 391                 goto error;\r
 392         }\r
 393 \r
 394         gvar->mmi.XMSmem += gvar->pm.xmm.XMSAvail * 1024;\r
 395 \r
 396         gvar->pm.xmm.XMSPresent = true;\r
 397 error:\r
 398         return(gvar->pm.xmm.XMSPresent);\r
 399 }\r
 400 \r
 401 //\r
 402 //      PML_XMSCopy() - Copies a main/EMS page to or from XMS\r
 403 //              Will round an odd-length request up to the next even value\r
 404 //\r
 405 void\r
 406 PML_XMSCopy(boolean toxms,byte far *addr,word xmspage,word length, global_game_variables_t *gvar)\r
 407 {\r
 408         dword   xoffset;\r
 409         struct\r
 410         {\r
 411                 dword   length;\r
 412                 word            source_handle;\r
 413                 dword   source_offset;\r
 414                 word            target_handle;\r
 415                 dword   target_offset;\r
 416         } copy;\r
 417 \r
 418         if (!addr)\r
 419         {\r
 420                 Quit("PML_XMSCopy: zero address\n");\r
 421                 //return;\r
 422         }\r
 423 \r
 424         xoffset = (dword)xmspage * PMPageSize;\r
 425 \r
 426         copy.length = (length + 1) & ~1;\r
 427         copy.source_handle = toxms? 0 : gvar->pm.xmm.XMSHandle;\r
 428         copy.source_offset = toxms? (long)addr : xoffset;\r
 429         copy.target_handle = toxms? gvar->pm.xmm.XMSHandle : 0;\r
 430         copy.target_offset = toxms? xoffset : (long)addr;\r
 431 \r
 432         __asm {\r
 433                 push si\r
 434         }\r
 435         _SI = (word)&copy;\r
 436         XMS_CALL(XMS_MOVE);\r
 437         __asm {\r
 438                 pop     si\r
 439         }\r
 440         if (!_AX)\r
 441         {\r
 442                 Quit("PML_XMSCopy: Error on copy");\r
 443                 //return;\r
 444         }\r
 445 }\r
 446 \r
 447 #if 1\r
 448 #define PML_CopyToXMS(s,t,l,gvar)       PML_XMSCopy(true,(s),(t),(l),(gvar))\r
 449 #define PML_CopyFromXMS(t,s,l,gvar)     PML_XMSCopy(false,(t),(s),(l),(gvar))\r
 450 #else\r
 451 //\r
 452 //      PML_CopyToXMS() - Copies the specified number of bytes from the real mode\r
 453 //              segment address to the specified XMS page\r
 454 //\r
 455 void\r
 456 PML_CopyToXMS(byte far *source,int targetpage,word length,global_game_variables_t *gvar)\r
 457 {\r
 458         PML_XMSCopy(true,source,targetpage,length, global_game_variables_t *gvar);\r
 459 }\r
 460 \r
 461 //\r
 462 //      PML_CopyFromXMS() - Copies the specified number of bytes from an XMS\r
 463 //              page to the specified real mode address\r
 464 //\r
 465 void\r
 466 PML_CopyFromXMS(byte far *target,int sourcepage,word length, global_game_variables_t *gvar)\r
 467 {\r
 468         PML_XMSCopy(false,target,sourcepage,length, global_game_variables_t *gvar);\r
 469 }\r
 470 #endif\r
 471 \r
 472 //\r
 473 //      PML_ShutdownXMS()\r
 474 //\r
 475 void\r
 476 PML_ShutdownXMS(global_game_variables_t *gvar)\r
 477 {\r
 478         if (gvar->pm.xmm.XMSPresent)\r
 479         {\r
 480                 _DX = gvar->pm.xmm.XMSHandle;\r
 481                 XMS_CALL(XMS_FREE);\r
 482                 if (_BL)\r
 483                 {\r
 484                         Quit("PML_ShutdownXMS: Error freeing XMS");\r
 485                         //return;\r
 486                 }\r
 487         }\r
 488 }\r
 489 \r
 490 /////////////////////////////////////////////////////////////////////////////\r
 491 //\r
 492 //      Main memory code\r
 493 //\r
 494 /////////////////////////////////////////////////////////////////////////////\r
 495 \r
 496 //\r
 497 //      PM_SetMainMemPurge() - Sets the purge level for all allocated main memory\r
 498 //              blocks. This shouldn't be called directly - the PM_LockMainMem() and\r
 499 //              PM_UnlockMainMem() macros should be used instead.\r
 500 //\r
 501 void\r
 502 PM_SetMainMemPurge(int level, global_game_variables_t *gvar)\r
 503 {\r
 504         int     i;\r
 505 \r
 506         if(gvar->pm.mm.MainPresent)\r
 507         for (i = 0;i < PMMaxMainMem;i++)\r
 508         {\r
 509 #ifdef __DEBUG_PM__\r
 510                 printf("PM_SetMainMemPurge()    info of gvar->pm.mm.MainMemPages[i]\n");\r
 511                 printf("&       %Fp,    %Fp\n", &gvar->pm.mm.MainMemPages[i],   &(gvar->pm.mm.MainMemPages[i]));\r
 512 #endif\r
 513                 if (gvar->pm.mm.MainMemPages[i])\r
 514                         MM_SetPurge(&(gvar->pm.mm.MainMemPages[i]),level, gvar);\r
 515         }\r
 516 \r
 517         else\r
 518         {\r
 519                 Quit("MainPresent IS NULL\n");\r
 520         }\r
 521 }\r
 522 \r
 523 //\r
 524 //      PM_CheckMainMem() - If something besides the Page Mgr makes requests of\r
 525 //              the Memory Mgr, some of the Page Mgr's blocks may have been purged,\r
 526 //              so this function runs through the block list and checks to see if\r
 527 //              any of the blocks have been purged. If so, it marks the corresponding\r
 528 //              page as purged & unlocked, then goes through the block list and\r
 529 //              tries to reallocate any blocks that have been purged.\r
 530 //      This routine now calls PM_LockMainMem() to make sure that any allocation\r
 531 //              attempts made during the block reallocation sweep don't purge any\r
 532 //              of the other blocks. Because PM_LockMainMem() is called,\r
 533 //              PM_UnlockMainMem() needs to be called before any other part of the\r
 534 //              program makes allocation requests of the Memory Mgr.\r
 535 //\r
 536 void\r
 537 PM_CheckMainMem(global_game_variables_t *gvar)\r
 538 {\r
 539         boolean                 allocfailed;\r
 540         int                             i,n;\r
 541         memptr                  *p;\r
 542         PMBlockAttr             *used;\r
 543         PageListStruct  far *page;\r
 544 \r
 545         if (!gvar->pm.mm.MainPresent)\r
 546                 return;\r
 547 \r
 548         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 549         {\r
 550                 n = page->mainPage;\r
 551                 if (n != -1)                                            // Is the page using main memory?\r
 552                 {\r
 553                         if (!gvar->pm.mm.MainMemPages[n])                       // Yep, was the block purged?\r
 554                         {\r
 555                                 page->mainPage = -1;            // Yes, mark page as purged & unlocked\r
 556                                 page->locked = pml_Unlocked;\r
 557                         }\r
 558                 }\r
 559         }\r
 560 \r
 561         // Prevent allocation attempts from purging any of our other blocks\r
 562         PM_LockMainMem(gvar);\r
 563         allocfailed = false;\r
 564         for (i = 0,p = gvar->pm.mm.MainMemPages,used = gvar->pm.mm.MainMemUsed; i < PMMaxMainMem;i++,p++,used++)\r
 565         {\r
 566                 if (!*p)                                                        // If the page got purged\r
 567                 {\r
 568                         if (*used & pmba_Allocated)             // If it was allocated\r
 569                         {\r
 570                                 *used &= ~pmba_Allocated;       // Mark as unallocated\r
 571                                 gvar->pm.mm.MainPagesAvail--;                   // and decrease available count\r
 572                         }\r
 573 \r
 574                         if (*used & pmba_Used)                  // If it was used\r
 575                         {\r
 576                                 *used &= ~pmba_Used;            // Mark as unused\r
 577                                 gvar->pm.MainPagesUsed--;                       // and decrease used count\r
 578                         }\r
 579 \r
 580                         if (!allocfailed)\r
 581                         {\r
 582                                 MM_BombOnError(false, gvar);\r
 583                                 MM_GetPtr(p,PMPageSize, gvar);          // Try to reallocate\r
 584                                 if (gvar->mm.mmerror)                                   // If it failed,\r
 585                                         allocfailed = true;                     //  don't try any more allocations\r
 586                                 else                                                    // If it worked,\r
 587                                 {\r
 588                                         *used |= pmba_Allocated;        // Mark as allocated\r
 589                                         gvar->pm.mm.MainPagesAvail++;                   // and increase available count\r
 590                                 }\r
 591                                 MM_BombOnError(true, gvar);\r
 592                         }\r
 593                 }\r
 594         }\r
 595         if (gvar->mm.mmerror)\r
 596                 gvar->mm.mmerror = false;\r
 597 }\r
 598 \r
 599 //\r
 600 //      PML_StartupMainMem() - Allocates as much main memory as is possible for\r
 601 //              the Page Mgr. The memory is allocated as non-purgeable, so if it's\r
 602 //              necessary to make requests of the Memory Mgr, PM_UnlockMainMem()\r
 603 //              needs to be called.\r
 604 //\r
 605 void\r
 606 PML_StartupMainMem(global_game_variables_t *gvar)\r
 607 {\r
 608         int             i,n;\r
 609         memptr  *p;\r
 610 \r
 611         gvar->pm.mm.MainPagesAvail = 0;\r
 612         gvar->pm.mm.MainPresent = false;\r
 613         MM_BombOnError(false, gvar);\r
 614         printf("PML_StartupMainMem()\n");\r
 615         printf("        p=%04x  MainMemPages=%04x\n", p, gvar->pm.mm.MainMemPages);\r
 616         printf("        p=%Fp   MainMemPages=%Fp\n", p, gvar->pm.mm.MainMemPages);\r
 617         for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)\r
 618         {\r
 619                 MM_GetPtr(p,PMPageSize, gvar);\r
 620                 if (gvar->mm.mmerror)\r
 621                         break;\r
 622 \r
 623                 gvar->pm.mm.MainPagesAvail++;\r
 624                 gvar->pm.mm.MainMemUsed[i] = pmba_Allocated;\r
 625         }\r
 626         MM_BombOnError(true, gvar);\r
 627         if (gvar->mm.mmerror)\r
 628                 gvar->mm.mmerror = false;\r
 629         if (gvar->pm.mm.MainPagesAvail < PMMinMainMem)\r
 630         {\r
 631                 Quit("PM_SetupMainMem: Not enough main memory");\r
 632                 //return;\r
 633         }\r
 634         gvar->pm.mm.MainPresent = true;\r
 635 }\r
 636 \r
 637 //\r
 638 //      PML_ShutdownMainMem() - Frees all of the main memory blocks used by the\r
 639 //              Page Mgr.\r
 640 //\r
 641 void\r
 642 PML_ShutdownMainMem(global_game_variables_t *gvar)\r
 643 {\r
 644         int             i;\r
 645         memptr  *p;\r
 646 \r
 647         // DEBUG - mark pages as unallocated & decrease page count as appropriate\r
 648         for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)\r
 649                 if (*p)\r
 650                         MM_FreePtr(p, gvar);\r
 651 }\r
 652 \r
 653 /////////////////////////////////////////////////////////////////////////////\r
 654 //\r
 655 //      File management code\r
 656 //\r
 657 /////////////////////////////////////////////////////////////////////////////\r
 658 \r
 659 //\r
 660 //      PML_ReadFromFile() - Reads some data in from the page file\r
 661 //\r
 662 void\r
 663 PML_ReadFromFile(byte far *buf,long offset,word length, global_game_variables_t *gvar)\r
 664 {\r
 665         if (!buf)\r
 666         {\r
 667                 Quit("PML_ReadFromFile: Null pointer");\r
 668                 //return;\r
 669         }\r
 670         if (!offset)\r
 671         {\r
 672                 Quit("PML_ReadFromFile: Zero offset");\r
 673                 //return;\r
 674         }\r
 675         if (lseek(gvar->pm.fi.PageFile,offset,SEEK_SET) != offset)\r
 676         {\r
 677                 Quit("PML_ReadFromFile: Seek failed");\r
 678                 //return;\r
 679         }\r
 680         if (!CA_FarRead(gvar->pm.fi.PageFile,buf,length, gvar))\r
 681         {\r
 682                 Quit("PML_ReadFromFile: Read failed");\r
 683                 //return;\r
 684         }\r
 685 }\r
 686 \r
 687 //\r
 688 //      PML_OpenPageFile() - Opens the page file and sets up the page info\r
 689 //\r
 690 void\r
 691 PML_OpenPageFile(global_game_variables_t *gvar)\r
 692 {\r
 693         int                             i;\r
 694         long                    size;\r
 695                                 //__SEGA buf;\r
 696         memptr          buf;\r
 697         dword           far *offsetptr;\r
 698         word                    far *lengthptr;\r
 699         PageListStruct  far *page;\r
 700 \r
 701         gvar->pm.fi.PageFile = open(gvar->pm.fi.PageFileName,O_RDONLY + O_BINARY);\r
 702         if (gvar->pm.fi.PageFile == -1)\r
 703         {\r
 704                 Quit("PML_OpenPageFile: Unable to open page file");\r
 705                 //return;\r
 706         }\r
 707 \r
 708         // Read in header variables\r
 709         read(gvar->pm.fi.PageFile,&gvar->pm.fi.ChunksInFile,sizeof(gvar->pm.fi.ChunksInFile));\r
 710         read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSpriteStart,sizeof(gvar->pm.fi.PMSpriteStart));\r
 711         read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSoundStart,sizeof(gvar->pm.fi.PMSoundStart));\r
 712 \r
 713         // Allocate and clear the page list\r
 714         gvar->pm.PMNumBlocks = gvar->pm.fi.ChunksInFile;\r
 715         MM_GetPtr((memptr *)gvar->pm.PMSegPages, sizeof(PageListStruct) * (gvar->pm.PMNumBlocks), gvar);\r
 716         MM_SetLock((memptr *)gvar->pm.PMSegPages,true, gvar);\r
 717         gvar->pm.PMPages = (PageListStruct far *)gvar->pm.PMSegPages;\r
 718         _fmemset(gvar->pm.PMPages,0,sizeof(PageListStruct) * gvar->pm.PMNumBlocks);\r
 719 \r
 720         // Read in the chunk offsets\r
 721         size = sizeof(dword) * gvar->pm.fi.ChunksInFile;\r
 722         MM_GetPtr(&buf, size, gvar);\r
 723         if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))\r
 724         {\r
 725                 Quit("PML_OpenPageFile: Offset read failed");\r
 726                 //return;\r
 727         }\r
 728         offsetptr = (dword far *)buf;\r
 729         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 730                 page->offset = *offsetptr++;\r
 731         MM_FreePtr(&buf, gvar);\r
 732 \r
 733         // Read in the chunk lengths\r
 734         size = sizeof(word) * gvar->pm.fi.ChunksInFile;\r
 735         MM_GetPtr(&buf,size, gvar);\r
 736         if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))\r
 737         {\r
 738                 Quit("PML_OpenPageFile: Length read failed");\r
 739                 //return;\r
 740         }\r
 741         lengthptr = (word far *)buf;\r
 742         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 743                 page->length = *lengthptr++;\r
 744         MM_FreePtr(&buf, gvar);\r
 745 }\r
 746 \r
 747 //\r
 748 //  PML_ClosePageFile() - Closes the page file\r
 749 //\r
 750 void\r
 751 PML_ClosePageFile(global_game_variables_t *gvar)\r
 752 {\r
 753         if (gvar->pm.fi.PageFile != -1)\r
 754                 close(gvar->pm.fi.PageFile);\r
 755         if (gvar->pm.PMSegPages)\r
 756         {\r
 757                 MM_SetLock((memptr)gvar->pm.PMSegPages,false, gvar);\r
 758                 MM_FreePtr((memptr)gvar->pm.PMSegPages, gvar);\r
 759         }\r
 760 }\r
 761 \r
 762 /////////////////////////////////////////////////////////////////////////////\r
 763 //\r
 764 //      Allocation, etc., code\r
 765 //\r
 766 /////////////////////////////////////////////////////////////////////////////\r
 767 \r
 768 //\r
 769 //      PML_GetEMSAddress()\r
 770 //\r
 771 //              Page is in EMS, so figure out which EMS physical page should be used\r
 772 //              to map our page in. If normal page, use EMS physical page 3, else\r
 773 //              use the physical page specified by the lock type\r
 774 //\r
 775 #ifndef __DEBUG_2__\r
 776 #pragma argsused        // DEBUG - remove lock parameter\r
 777 memptr\r
 778 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)\r
 779 {\r
 780         int             i,emspage;\r
 781         word    emsoff,emsbase,offset;\r
 782 \r
 783         emsoff = page & (PMEMSSubPage - 1);\r
 784         emsbase = page - emsoff;\r
 785 \r
 786         emspage = -1;\r
 787         // See if this page is already mapped in\r
 788         for (i = 0;i < EMSFrameCount;i++)\r
 789         {\r
 790                 if (gvar->pm.emm.EMSList[i].baseEMSPage == emsbase)\r
 791                 {\r
 792                         emspage = i;    // Yep - don't do a redundant remapping\r
 793                         break;\r
 794                 }\r
 795         }\r
 796 \r
 797         // If page isn't already mapped in, find LRU EMS frame, and use it\r
 798         if (emspage == -1)\r
 799         {\r
 800                 dword last = LONG_MAX;\r
 801                 for (i = 0;i < EMSFrameCount;i++)\r
 802                 {\r
 803                         if (gvar->pm.emm.EMSList[i].lastHit < last)\r
 804                         {\r
 805                                 emspage = i;\r
 806                                 last = gvar->pm.emm.EMSList[i].lastHit;\r
 807                         }\r
 808                 }\r
 809 \r
 810                 gvar->pm.emm.EMSList[emspage].baseEMSPage = emsbase;\r
 811                 PML_MapEMS(page / PMEMSSubPage,emspage, gvar);\r
 812         }\r
 813 \r
 814         if (emspage == -1)\r
 815                 Quit("PML_GetEMSAddress: EMS find failed");\r
 816 \r
 817         gvar->pm.emm.EMSList[emspage].lastHit = gvar->pm.PMFrameCount;\r
 818         offset = emspage * EMSPageSizeSeg;\r
 819         offset += emsoff * PMPageSizeSeg;\r
 820         return((memptr)(gvar->pm.emm.EMSPageFrame + offset));\r
 821 }\r
 822 #else\r
 823 memptr\r
 824 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)\r
 825 {\r
 826         word    emspage;\r
 827 \r
 828         emspage = (lock < pml_EMSLock)? 3 : (lock - pml_EMSLock);\r
 829 \r
 830         PML_MapEMS(page / PMEMSSubPage,emspage);\r
 831 \r
 832         return((memptr)(EMSPageFrame + (emspage * EMSPageSizeSeg)\r
 833                         + ((page & (PMEMSSubPage - 1)) * PMPageSizeSeg)));\r
 834 }\r
 835 #endif\r
 836 \r
 837 //\r
 838 //      PM_GetPageAddress() - Returns the address of a given page\r
 839 //              Maps in EMS if necessary\r
 840 //              Returns nil if block isn't cached into Main Memory or EMS\r
 841 //\r
 842 //\r
 843 memptr\r
 844 PM_GetPageAddress(int pagenum, global_game_variables_t *gvar)\r
 845 {\r
 846         PageListStruct  far *page;\r
 847 \r
 848         page = &gvar->pm.PMPages[pagenum];\r
 849         if (page->mainPage != -1)\r
 850                 return(gvar->pm.mm.MainMemPages[page->mainPage]);\r
 851         else if (page->emsPage != -1)\r
 852                 return(PML_GetEMSAddress(page->emsPage,page->locked, gvar));\r
 853         else\r
 854                 return(nil);\r
 855 }\r
 856 \r
 857 //\r
 858 //      PML_GiveLRUPage() - Returns the page # of the least recently used\r
 859 //              present & unlocked main/EMS page (or main page if mainonly is true)\r
 860 //\r
 861 int\r
 862 PML_GiveLRUPage(boolean mainonly, global_game_variables_t *gvar)\r
 863 {\r
 864         int                             i,lru;\r
 865         long                    last;\r
 866         PageListStruct  far *page;\r
 867 \r
 868         for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 869         {\r
 870                 if\r
 871                 (\r
 872                         (page->lastHit < last)\r
 873                 &&      ((page->emsPage != -1) || (page->mainPage != -1))\r
 874                 &&      (page->locked == pml_Unlocked)\r
 875                 &&      (!(mainonly && (page->mainPage == -1)))\r
 876                 )\r
 877                 {\r
 878                         last = page->lastHit;\r
 879                         lru = i;\r
 880                 }\r
 881         }\r
 882 \r
 883         if (lru == -1)\r
 884                 Quit("PML_GiveLRUPage: LRU Search failed");\r
 885         return(lru);\r
 886 }\r
 887 \r
 888 //\r
 889 //      PML_GiveLRUXMSPage() - Returns the page # of the least recently used\r
 890 //              (and present) XMS page.\r
 891 //      This routine won't return the XMS page protected (by XMSProtectPage)\r
 892 //\r
 893 int\r
 894 PML_GiveLRUXMSPage(global_game_variables_t *gvar)\r
 895 {\r
 896         int                             i,lru;\r
 897         long                    last;\r
 898         PageListStruct  far *page;\r
 899 \r
 900         for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 901         {\r
 902                 if\r
 903                 (\r
 904                         (page->xmsPage != -1)\r
 905                 &&      (page->lastHit < last)\r
 906                 &&      (i != gvar->pm.xmm.XMSProtectPage)\r
 907                 )\r
 908                 {\r
 909                         last = page->lastHit;\r
 910                         lru = i;\r
 911                 }\r
 912         }\r
 913         return(lru);\r
 914 }\r
 915 \r
 916 //\r
 917 //      PML_PutPageInXMS() - If page isn't in XMS, find LRU XMS page and replace\r
 918 //              it with the main/EMS page\r
 919 //\r
 920 void\r
 921 PML_PutPageInXMS(int pagenum, global_game_variables_t *gvar)\r
 922 {\r
 923         int                             usexms;\r
 924         PageListStruct  far *page;\r
 925 \r
 926         if (!gvar->pm.xmm.XMSPresent)\r
 927                 return;\r
 928 \r
 929         page = &gvar->pm.PMPages[pagenum];\r
 930         if (page->xmsPage != -1)\r
 931                 return;                                 // Already in XMS\r
 932 \r
 933         if (gvar->pm.XMSPagesUsed < gvar->pm.xmm.XMSPagesAvail)\r
 934                 page->xmsPage = gvar->pm.XMSPagesUsed++;\r
 935         else\r
 936         {\r
 937                 usexms = PML_GiveLRUXMSPage(gvar);\r
 938                 if (usexms == -1)\r
 939                         Quit("PML_PutPageInXMS: No XMS LRU");\r
 940                 page->xmsPage = gvar->pm.PMPages[usexms].xmsPage;\r
 941                 gvar->pm.PMPages[usexms].xmsPage = -1;\r
 942         }\r
 943         PML_CopyToXMS(PM_GetPageAddress(pagenum, gvar),page->xmsPage,page->length, gvar);\r
 944 }\r
 945 \r
 946 //\r
 947 //      PML_TransferPageSpace() - A page is being replaced, so give the new page\r
 948 //              the old one's address space. Returns the address of the new page.\r
 949 //\r
 950 memptr\r
 951 PML_TransferPageSpace(int orig,int new, global_game_variables_t *gvar)\r
 952 {\r
 953         memptr                  addr;\r
 954         PageListStruct  far *origpage,far *newpage;\r
 955 \r
 956         if (orig == new)\r
 957                 Quit("PML_TransferPageSpace: Identity replacement");\r
 958 \r
 959         origpage = &gvar->pm.PMPages[orig];\r
 960         newpage = &gvar->pm.PMPages[new];\r
 961 \r
 962         if (origpage->locked != pml_Unlocked)\r
 963                 Quit("PML_TransferPageSpace: Killing locked page");\r
 964 \r
 965         if ((origpage->emsPage == -1) && (origpage->mainPage == -1))\r
 966                 Quit("PML_TransferPageSpace: Reusing non-existent page");\r
 967 \r
 968         // Copy page that's about to be purged into XMS\r
 969         PML_PutPageInXMS(orig, gvar);\r
 970 \r
 971         // Get the address, and force EMS into a physical page if necessary\r
 972         addr = PM_GetPageAddress(orig, gvar);\r
 973 \r
 974         // Steal the address\r
 975         newpage->emsPage = origpage->emsPage;\r
 976         newpage->mainPage = origpage->mainPage;\r
 977 \r
 978         // Mark replaced page as purged\r
 979         origpage->mainPage = origpage->emsPage = -1;\r
 980 \r
 981         if (!addr)\r
 982                 Quit("PML_TransferPageSpace: Zero replacement");\r
 983 \r
 984         return(addr);\r
 985 }\r
 986 \r
 987 //\r
 988 //      PML_GetAPageBuffer() - A page buffer is needed. Either get it from the\r
 989 //              main/EMS free pool, or use PML_GiveLRUPage() to find which page to\r
 990 //              steal the buffer from. Returns a far pointer to the page buffer, and\r
 991 //              sets the fields inside the given page structure appropriately.\r
 992 //              If mainonly is true, free EMS will be ignored, and only main pages\r
 993 //              will be looked at by PML_GiveLRUPage().\r
 994 //\r
 995 byte far *\r
 996 PML_GetAPageBuffer(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
 997 {\r
 998         byte                    far *addr = nil;\r
 999         int                             i,n;\r
1000         PMBlockAttr             *used;\r
1001         PageListStruct  far *page;\r
1002 \r
1003         page = &gvar->pm.PMPages[pagenum];\r
1004         if ((gvar->pm.EMSPagesUsed < gvar->pm.emm.EMSPagesAvail) && !mainonly)\r
1005         {\r
1006                 // There's remaining EMS - use it\r
1007                 page->emsPage = gvar->pm.EMSPagesUsed++;\r
1008                 addr = PML_GetEMSAddress(page->emsPage,page->locked, gvar);\r
1009         }\r
1010         else if (gvar->pm.MainPagesUsed < gvar->pm.mm.MainPagesAvail)\r
1011         {\r
1012                 // There's remaining main memory - use it\r
1013                 for (i = 0,n = -1,used = gvar->pm.mm.MainMemUsed;i < PMMaxMainMem;i++,used++)\r
1014                 {\r
1015                         if ((*used & pmba_Allocated) && !(*used & pmba_Used))\r
1016                         {\r
1017                                 n = i;\r
1018                                 *used |= pmba_Used;\r
1019                                 break;\r
1020                         }\r
1021                 }\r
1022                 if (n == -1)\r
1023                         Quit("PML_GetPageBuffer: MainPagesAvail lied");\r
1024                 addr = gvar->pm.mm.MainMemPages[n];\r
1025                 if (!addr)\r
1026                         Quit("PML_GetPageBuffer: Purged main block");\r
1027                 page->mainPage = n;\r
1028                 gvar->pm.MainPagesUsed++;\r
1029         }\r
1030         else\r
1031                 addr = PML_TransferPageSpace(PML_GiveLRUPage(mainonly, gvar),pagenum, gvar);\r
1032 \r
1033         if (!addr)\r
1034                 Quit("PML_GetPageBuffer: Search failed");\r
1035         return(addr);\r
1036 }\r
1037 \r
1038 //\r
1039 //      PML_GetPageFromXMS() - If page is in XMS, find LRU main/EMS page and\r
1040 //              replace it with the page from XMS. If mainonly is true, will only\r
1041 //              search for LRU main page.\r
1042 //      XMSProtectPage is set to the page to be retrieved from XMS, so that if\r
1043 //              the page from which we're stealing the main/EMS from isn't in XMS,\r
1044 //              it won't copy over the page that we're trying to get from XMS.\r
1045 //              (pages that are being purged are copied into XMS, if possible)\r
1046 //\r
1047 memptr\r
1048 PML_GetPageFromXMS(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
1049 {\r
1050         byte                    far *checkaddr;\r
1051         memptr                  addr = nil;\r
1052         PageListStruct  far *page;\r
1053 \r
1054         page = &gvar->pm.PMPages[pagenum];\r
1055         if (gvar->pm.xmm.XMSPresent && (page->xmsPage != -1))\r
1056         {\r
1057                 gvar->pm.xmm.XMSProtectPage = pagenum;\r
1058                 checkaddr = PML_GetAPageBuffer(pagenum,mainonly, gvar);\r
1059                 if (FP_OFF(checkaddr))\r
1060                         Quit("PML_GetPageFromXMS: Non segment pointer");\r
1061                 addr = (memptr)FP_SEG(checkaddr);\r
1062                 PML_CopyFromXMS(addr,page->xmsPage,page->length, gvar);\r
1063                 gvar->pm.xmm.XMSProtectPage = -1;\r
1064         }\r
1065 \r
1066         return(addr);\r
1067 }\r
1068 \r
1069 //\r
1070 //      PML_LoadPage() - A page is not in main/EMS memory, and it's not in XMS.\r
1071 //              Load it into either main or EMS. If mainonly is true, the page will\r
1072 //              only be loaded into main.\r
1073 //\r
1074 void\r
1075 PML_LoadPage(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
1076 {\r
1077         byte                    far *addr;\r
1078         PageListStruct  far *page;\r
1079 \r
1080         addr = PML_GetAPageBuffer(pagenum,mainonly, gvar);\r
1081         page = &gvar->pm.PMPages[pagenum];\r
1082         PML_ReadFromFile(addr,page->offset,page->length, gvar);\r
1083 }\r
1084 \r
1085 //\r
1086 //      PM_GetPage() - Returns the address of the page, loading it if necessary\r
1087 //              First, check if in Main Memory or EMS\r
1088 //              Then, check XMS\r
1089 //              If not in XMS, load into Main Memory or EMS\r
1090 //\r
1091 #pragma warn -pia\r
1092 memptr\r
1093 PM_GetPage(int pagenum, global_game_variables_t *gvar)\r
1094 {\r
1095         memptr  result;\r
1096 \r
1097         if (pagenum >= gvar->pm.fi.ChunksInFile)\r
1098                 Quit("PM_GetPage: Invalid page request");\r
1099 \r
1100 #ifdef __DEBUG_2__      // for debugging\r
1101         __asm {\r
1102                 mov     dx,STATUS_REGISTER_1\r
1103                 in      al,dx\r
1104                 mov     dx,ATR_INDEX\r
1105                 mov     al,ATR_OVERSCAN\r
1106                 out     dx,al\r
1107                 mov     al,10   // bright green\r
1108                 out     dx,al\r
1109         }\r
1110 #endif\r
1111 \r
1112         if (!(result = PM_GetPageAddress(pagenum, gvar)))\r
1113         {\r
1114                 boolean mainonly = (pagenum >= gvar->pm.fi.PMSoundStart);\r
1115 if (!gvar->pm.PMPages[pagenum].offset)  // JDC: sparse page\r
1116         Quit ("Tried to load a sparse page!");\r
1117                 if (!(result = PML_GetPageFromXMS(pagenum,mainonly, gvar)))\r
1118                 {\r
1119                         if (gvar->pm.PMPages[pagenum].lastHit ==  gvar->pm.PMFrameCount)\r
1120                                 gvar->pm.PMThrashing++;\r
1121 \r
1122                         PML_LoadPage(pagenum,mainonly, gvar);\r
1123                         result = PM_GetPageAddress(pagenum, gvar);\r
1124                 }\r
1125         }\r
1126         gvar->pm.PMPages[pagenum].lastHit =  gvar->pm.PMFrameCount;\r
1127 \r
1128 #ifdef __DEBUG_2__      // for debugging\r
1129         __asm{\r
1130                 mov     dx,STATUS_REGISTER_1\r
1131                 in      al,dx\r
1132                 mov     dx,ATR_INDEX\r
1133                 mov     al,ATR_OVERSCAN\r
1134                 out     dx,al\r
1135                 mov     al,3    // blue\r
1136                 out     dx,al\r
1137                 mov     al,0x20 // normal\r
1138                 out     dx,al\r
1139 #endif\r
1140 \r
1141         return(result);\r
1142 }\r
1143 #pragma warn +pia\r
1144 \r
1145 //\r
1146 //      PM_SetPageLock() - Sets the lock type on a given page\r
1147 //              pml_Unlocked: Normal, page can be purged\r
1148 //              pml_Locked: Cannot be purged\r
1149 //              pml_EMS?: Same as pml_Locked, but if in EMS, use the physical page\r
1150 //                                      specified when returning the address. For sound stuff.\r
1151 //\r
1152 void\r
1153 PM_SetPageLock(int pagenum,PMLockType lock, global_game_variables_t *gvar)\r
1154 {\r
1155         if (pagenum < gvar->pm.fi.PMSoundStart)\r
1156                 Quit("PM_SetPageLock: Locking/unlocking non-sound page");\r
1157 \r
1158         gvar->pm.PMPages[pagenum].locked = lock;\r
1159 }\r
1160 \r
1161 //\r
1162 //      PM_Preload() - Loads as many pages as possible into all types of memory.\r
1163 //              Calls the update function after each load, indicating the current\r
1164 //              page, and the total pages that need to be loaded (for thermometer).\r
1165 //\r
1166 void\r
1167 PM_Preload(boolean (*update)(word current,word total), global_game_variables_t *gvar)\r
1168 {\r
1169         int                             i,j,\r
1170                                         page,oogypage;\r
1171         word                    current,total,\r
1172                                         totalnonxms,totalxms,\r
1173                                         mainfree,maintotal,\r
1174                                         emsfree,emstotal,\r
1175                                         xmsfree,xmstotal;\r
1176         memptr                  addr;\r
1177         PageListStruct  far *p;\r
1178 \r
1179         mainfree = (gvar->pm.mm.MainPagesAvail - gvar->pm.MainPagesUsed) + (gvar->pm.emm.EMSPagesAvail - gvar->pm.EMSPagesUsed);\r
1180         xmsfree = (gvar->pm.xmm.XMSPagesAvail - gvar->pm.XMSPagesUsed);\r
1181 \r
1182         xmstotal = maintotal = 0;\r
1183 \r
1184         for (i = 0;i < gvar->pm.fi.ChunksInFile;i++)\r
1185         {\r
1186                 if (!gvar->pm.PMPages[i].offset)\r
1187                         continue;                       // sparse\r
1188 \r
1189                 if ( gvar->pm.PMPages[i].emsPage != -1 || gvar->pm.PMPages[i].mainPage != -1 )\r
1190                         continue;                       // already in main mem\r
1191 \r
1192                 if ( mainfree )\r
1193                 {\r
1194                         maintotal++;\r
1195                         mainfree--;\r
1196                 }\r
1197                 else if ( xmsfree && (gvar->pm.PMPages[i].xmsPage == -1) )\r
1198                 {\r
1199                         xmstotal++;\r
1200                         xmsfree--;\r
1201                 }\r
1202         }\r
1203 \r
1204 \r
1205         total = maintotal + xmstotal;\r
1206 \r
1207         if (!total)\r
1208                 return;\r
1209 \r
1210         page = 0;\r
1211         current = 0;\r
1212 \r
1213 //\r
1214 // cache main/ems blocks\r
1215 //\r
1216         while (maintotal)\r
1217         {\r
1218                 while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].mainPage != -1\r
1219                         ||      gvar->pm.PMPages[page].emsPage != -1 )\r
1220                         page++;\r
1221 \r
1222                 if (page >= gvar->pm.fi.ChunksInFile)\r
1223                         Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");\r
1224 \r
1225                 PM_GetPage(page, gvar);\r
1226 \r
1227                 page++;\r
1228                 current++;\r
1229                 maintotal--;\r
1230                 update(current,total);\r
1231         }\r
1232 \r
1233 //\r
1234 // load stuff to XMS\r
1235 //\r
1236         if (xmstotal)\r
1237         {\r
1238                 for (oogypage = 0 ; gvar->pm.PMPages[oogypage].mainPage == -1 ; oogypage++)\r
1239                 ;\r
1240                 addr = PM_GetPage(oogypage, gvar);\r
1241                 if (!addr)\r
1242                         Quit("PM_Preload: XMS buffer failed");\r
1243 \r
1244                 while (xmstotal)\r
1245                 {\r
1246                         while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].xmsPage != -1 )\r
1247                                 page++;\r
1248 \r
1249                         if (page >= gvar->pm.fi.ChunksInFile)\r
1250                                 Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");\r
1251 \r
1252                         p = &gvar->pm.PMPages[page];\r
1253 \r
1254                         p->xmsPage = gvar->pm.XMSPagesUsed++;\r
1255                         if (gvar->pm.XMSPagesUsed > gvar->pm.xmm.XMSPagesAvail)\r
1256                                 Quit("PM_Preload: Exceeded XMS pages");\r
1257                         if (p->length > PMPageSize)\r
1258                                 Quit("PM_Preload: Page too long");\r
1259 \r
1260                         PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);\r
1261                         PML_CopyToXMS((byte far *)addr,p->xmsPage,p->length, gvar);\r
1262 \r
1263                         page++;\r
1264                         current++;\r
1265                         xmstotal--;\r
1266                         update(current,total);\r
1267                 }\r
1268 \r
1269                 p = &gvar->pm.PMPages[oogypage];\r
1270                 PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);\r
1271         }\r
1272 \r
1273         update(total,total);\r
1274 }\r
1275 \r
1276 /////////////////////////////////////////////////////////////////////////////\r
1277 //\r
1278 //      General code\r
1279 //\r
1280 /////////////////////////////////////////////////////////////////////////////\r
1281 \r
1282 //\r
1283 //      PM_NextFrame() - Increments the frame counter and adjusts the thrash\r
1284 //              avoidence variables\r
1285 //\r
1286 //              If currently in panic mode (to avoid thrashing), check to see if the\r
1287 //                      appropriate number of frames have passed since the last time that\r
1288 //                      we would have thrashed. If so, take us out of panic mode.\r
1289 //\r
1290 //\r
1291 void\r
1292 PM_NextFrame(global_game_variables_t *gvar)\r
1293 {\r
1294         int     i;\r
1295 \r
1296         // Frame count overrun - kill the LRU hit entries & reset frame count\r
1297         if (++gvar->pm.PMFrameCount >= LONG_MAX - 4)\r
1298         {\r
1299                 for (i = 0;i < gvar->pm.PMNumBlocks;i++)\r
1300                         gvar->pm.PMPages[i].lastHit = 0;\r
1301                 gvar->pm.PMFrameCount = 0;\r
1302         }\r
1303 \r
1304 //#if 0\r
1305         for (i = 0;i < gvar->pm.fi.PMSoundStart;i++)\r
1306         {\r
1307                 if (gvar->pm.PMPages[i].locked)\r
1308                 {\r
1309                         char buf[40];\r
1310                         sprintf(buf,"PM_NextFrame: Page %d is locked",i);\r
1311                         Quit(buf);\r
1312                 }\r
1313         }\r
1314 //#endif\r
1315 \r
1316         if (gvar->pm.PMPanicMode)\r
1317         {\r
1318                 // DEBUG - set border color\r
1319                 if ((!gvar->pm.PMThrashing) && (!--gvar->pm.PMPanicMode))\r
1320                 {\r
1321                         // DEBUG - reset border color\r
1322                 }\r
1323         }\r
1324         if (gvar->pm.PMThrashing >= PMThrashThreshold)\r
1325                 gvar->pm.PMPanicMode = PMUnThrashThreshold;\r
1326         gvar->pm.PMThrashing = false;\r
1327 }\r
1328 \r
1329 //\r
1330 //      PM_Reset() - Sets up caching structures\r
1331 //\r
1332 void\r
1333 PM_Reset(global_game_variables_t *gvar)\r
1334 {\r
1335         int                             i;\r
1336         PageListStruct  far *page;\r
1337 \r
1338         gvar->pm.xmm.XMSPagesAvail = gvar->pm.xmm.XMSAvail / PMPageSizeKB;\r
1339 \r
1340         gvar->pm.emm.EMSPagesAvail = gvar->pm.emm.EMSAvail * (EMSPageSizeKB / PMPageSizeKB);\r
1341         gvar->pm.emm.EMSPhysicalPage = 0;\r
1342 \r
1343         gvar->pm.MainPagesUsed = gvar->pm.EMSPagesUsed = gvar->pm.XMSPagesUsed = 0;\r
1344 \r
1345         gvar->pm.PMPanicMode = false;\r
1346 \r
1347         gvar->pm.fi.PageFile = -1;\r
1348         gvar->pm.xmm.XMSProtectPage = -1;\r
1349 \r
1350         // Initialize page list\r
1351         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.PMNumBlocks;i++,page++)\r
1352         {\r
1353                 page->mainPage = -1;\r
1354                 page->emsPage = -1;\r
1355                 page->xmsPage = -1;\r
1356                 page->locked = false;\r
1357         }\r
1358 }\r
1359 \r
1360 //\r
1361 //      PM_Startup() - Start up the Page Mgr\r
1362 //\r
1363 void\r
1364 PM_Startup(global_game_variables_t *gvar)\r
1365 {\r
1366         boolean nomain,noems,noxms;\r
1367         int             i;\r
1368 \r
1369         if (gvar->pm.PMStarted)\r
1370                 return;\r
1371 \r
1372         //strcpy(&(gvar->pm.fi.PageFileName), "VSWAP.");\r
1373 \r
1374         nomain = noems = noxms = false;\r
1375         for (i = 1;i <\r
1376 #ifdef __WATCOMC__\r
1377         __argc\r
1378 #endif\r
1379 #ifdef __BORLANDC__\r
1380         _argc\r
1381 #endif\r
1382         ;i++)\r
1383         {\r
1384                 switch (US_CheckParm(\r
1385 #ifdef __WATCOMC__\r
1386         __argv[i]\r
1387 #endif\r
1388 #ifdef __BORLANDC__\r
1389         _argv[i]\r
1390 #endif\r
1391                 ,ParmStrings))\r
1392                 {\r
1393                 case 0:\r
1394                         nomain = true;\r
1395                         break;\r
1396                 case 1:\r
1397                         noems = true;\r
1398                         break;\r
1399                 case 2:\r
1400                         noxms = true;\r
1401                         break;\r
1402                 }\r
1403         }\r
1404 \r
1405         //0000++++PML_OpenPageFile(gvar);\r
1406 \r
1407         if (!noems)\r
1408                 PML_StartupEMS(gvar);\r
1409         if (!noxms)\r
1410                 //++++PML_StartupXMS(gvar);     //TODO: convert\r
1411 \r
1412         if (!nomain && !gvar->pm.emm.EMSPresent)\r
1413         {\r
1414                 Quit("PM_Startup: No main or EMS\n");\r
1415                 //return;\r
1416         }\r
1417         PML_StartupMainMem(gvar);\r
1418 \r
1419         PM_Reset(gvar);\r
1420 \r
1421         gvar->pm.PMStarted = true;\r
1422 }\r
1423 \r
1424 //\r
1425 //      PM_Shutdown() - Shut down the Page Mgr\r
1426 //\r
1427 void\r
1428 PM_Shutdown(global_game_variables_t *gvar)\r
1429 {\r
1430         PML_ShutdownXMS(gvar);\r
1431         PML_ShutdownEMS(gvar);\r
1432 \r
1433         if (!gvar->pm.PMStarted)\r
1434                 return;\r
1435 \r
1436         PML_ClosePageFile(gvar);\r
1437 \r
1438         PML_ShutdownMainMem(gvar);\r
1439 }\r