src/lib/16_pm.c

   1 /* Project 16 Source Code~\r
   2  * Copyright (C) 2012-2016 sparky4 & pngwen & andrius4669 & joncampbell123 & yakui-lover\r
   3  *\r
   4  * This file is part of Project 16.\r
   5  *\r
   6  * Project 16 is free software; you can redistribute it and/or modify\r
   7  * it under the terms of the GNU General Public License as published by\r
   8  * the Free Software Foundation; either version 3 of the License, or\r
   9  * (at your option) any later version.\r
  10  *\r
  11  * Project 16 is distributed in the hope that it will be useful,\r
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
  14  * GNU General Public License for more details.\r
  15  *\r
  16  * You should have received a copy of the GNU General Public License\r
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>, or\r
  18  * write to the Free Software Foundation, Inc., 51 Franklin Street,\r
  19  * Fifth Floor, Boston, MA 02110-1301 USA.\r
  20  *\r
  21  */\r
  22 \r
  23 //\r
  24 //      ID_PM.C\r
  25 //      Id Engine's Page Manager v1.0\r
  26 //      Primary coder: Jason Blochowiak\r
  27 //\r
  28 \r
  29 #include "src/lib/16_pm.h"\r
  30 #pragma hdrstop\r
  31 \r
  32 #ifdef __DEBUG__\r
  33 boolean dbg_debugpm=0;\r
  34 #endif\r
  35 \r
  36 //      Main Mem specific variables\r
  37         //boolean                       MainPresent;\r
  38 /*      memptr                  MainMemPages[PMMaxMainMem];\r
  39         PMBlockAttr             gvar->pm.mm.MainMemUsed[PMMaxMainMem];\r
  40         int                             gvar->pm.mm.MainPagesAvail;*/\r
  41 \r
  42 //      EMS specific variables\r
  43         //boolean                       EMSPresent;\r
  44 /*      word                    gvar->pm.emm.EMSAvail,gvar->pm.emm.EMSPagesAvail,gvar->pm.emm.EMSHandle,\r
  45                                         gvar->pm.emm.EMSPageFrame,gvar->pm.emm.EMSPhysicalPage;\r
  46         gvar->pm.emm.EMSListStruct      gvar->pm.emm.EMSList[EMSFrameCount];*/\r
  47 \r
  48 //      XMS specific variables\r
  49         //boolean                       XMSPresent;\r
  50         //word                  gvar->pm.xmm.XMSAvail,gvar->pm.xmm.XMSPagesAvail,gvar->pm.xmm.XMSHandle;\r
  51         dword           XMSDriver;\r
  52 /*      int                             gvar->pm.xmm.XMSProtectPage = -1;\r
  53 \r
  54 //      File specific variables\r
  55         char                    gvar->pm.fi.PageFileName[13] = {"VSWAP."};\r
  56         int                             PageFile = -1;\r
  57         word                    gvar->pm.fi.ChunksInFile;\r
  58         word                    PMSpriteStart,PMSoundStart;*/\r
  59 \r
  60 //      General usage variables\r
  61 /*      boolean                 PMStarted,\r
  62                                         gvar->pm.PMPanicMode,\r
  63                                         gvar->pm.PMThrashing;\r
  64         word                    gvar->pm.XMSPagesUsed,\r
  65                                         gvar->pm.EMSPagesUsed,\r
  66                                         MainPagesUsed,\r
  67                                         gvar->pm.PMNumBlocks;\r
  68         long                    PMFrameCount;\r
  69         PageListStruct  far *gvar->pm.PMPages,\r
  70                                         _seg *gvar->pm.PMSegPages;*/\r
  71 \r
  72 static  char            *ParmStrings[] = {"nomain","noems","noxms",nil};\r
  73 \r
  74 /////////////////////////////////////////////////////////////////////////////\r
  75 //\r
  76 //      EMS Management code\r
  77 //\r
  78 /////////////////////////////////////////////////////////////////////////////\r
  79 \r
  80 //\r
  81 //      PML_MapEMS() - Maps a logical page to a physical page\r
  82 //\r
  83 byte\r
  84 PML_MapEMS(word logical, byte physical, global_game_variables_t *gvar)\r
  85 {\r
  86         byte    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      erroreu\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      erroreu\r
 166 \r
 167                 and     dx,0x80\r
 168                 jz      erroreu\r
 169 \r
 170                 mov     ax,0x4407\r
 171 \r
 172                 int     EMS_INT         // get status\r
 173                 jc      erroreu\r
 174                 or      al,al\r
 175                 jz      erroreu\r
 176 \r
 177                 mov     ah,0x3e\r
 178                 int     EMS_INT         // close handle\r
 179                 jc      erroreu\r
 180 \r
 181                 mov     ah,EMS_STATUS\r
 182                 int     EMS_INT\r
 183                 jc      erroreu                 // 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     erroreu\r
 189                 mov     [EMSVer],ax             //      set EMSVer\r
 190                 cmp     al,0x32                 // only work on ems 3.2 or greater\r
 191                 jb      erroreu\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     erroreu\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     erroreu\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     Endeu\r
 211 #ifdef __BORLANDC__\r
 212         }\r
 213 #endif\r
 214                 erroreu:\r
 215 #ifdef __BORLANDC__\r
 216         __asm {\r
 217 #endif\r
 218                 mov     err,ah\r
 219                 mov     errorflag,1\r
 220                 jmp     Endeu\r
 221 #ifdef __BORLANDC__\r
 222         }\r
 223 #endif\r
 224                 noEMS:\r
 225                 Endeu:\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     erroreuu\r
 247                 mov     [EMSHandle],dx\r
 248                 jmp     Endeuu\r
 249 #ifdef __BORLANDC__\r
 250         }\r
 251 #endif\r
 252                 erroreuu:\r
 253 #ifdef __BORLANDC__\r
 254         __asm {\r
 255 #endif\r
 256                 mov     err,ah\r
 257                 mov     errorflag,1\r
 258                 jmp Endeuu\r
 259 #ifdef __BORLANDC__\r
 260         }\r
 261 #endif\r
 262                 Endeuu:\r
 263 #ifdef __WATCOMC__\r
 264         }\r
 265 #endif\r
 266 \r
 267         if(errorflag==false)\r
 268         {\r
 269         gvar->pm.emm.EMSAvail = EMSAvail;\r
 270         gvar->mmi.EMSmem = gvar->pm.emm.EMSAvail * (dword)EMSPageSize;\r
 271 \r
 272         // Initialize EMS mapping cache\r
 273         for (i = 0;i < EMSFrameCount;i++)\r
 274                 gvar->pm.emm.EMSList[i].baseEMSPage = -1;\r
 275 \r
 276         }\r
 277         else\r
 278         {\r
 279                 strcpy(str,"PML_StartupEMS: EMS error ");\r
 280                 MM_EMSerr(str, err);\r
 281                 printf("%s\n",str);\r
 282                 return(gvar->pm.emm.EMSPresent);\r
 283         }\r
 284 \r
 285         gvar->pm.emm.EMSPresent = true;                 // We have EMS\r
 286         gvar->pm.emm.EMSPageFrame = EMSPageFrame;\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      errores\r
 315                         jmp     Endes\r
 316 #ifdef __BORLANDC__\r
 317                 }\r
 318 #endif\r
 319                         errores:\r
 320 #ifdef __BORLANDC__\r
 321                 __asm {\r
 322 #endif\r
 323                         mov     err,ah\r
 324                         mov     errorflag,1\r
 325                         jmp     Endes\r
 326 #ifdef __BORLANDC__\r
 327                 }\r
 328 #endif\r
 329                         Endes:\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         boolean errorflag;\r
 360         word XMSAvail, XMSHandle;\r
 361         errorflag=gvar->pm.xmm.XMSPresent = false;                                      // Assume failure\r
 362         gvar->pm.xmm.XMSAvail = gvar->mmi.XMSmem = 0;\r
 363 \r
 364         __asm {\r
 365                 mov     ax,0x4300\r
 366                 int     XMS_INT                                         // Check for presence of XMS driver\r
 367                 cmp     al,0x80\r
 368                 jne     errorxu\r
 369 \r
 370                 mov     ax,0x4310\r
 371                 int     XMS_INT                                                 // Get address of XMS driver\r
 372                 mov     [WORD PTR XMSDriver],bx\r
 373                 mov     [WORD PTR XMSDriver+2],es               // function pointer to XMS driver\r
 374 \r
 375                 //XMS_CALL(XMS_QUERYFREE);                      // Find out how much XMS is available\r
 376                 mov     ah,XMS_QUERYFREE\r
 377                 call    [DWORD PTR XMSDriver]\r
 378                 mov     [XMSAvail],ax\r
 379                 or      ax,ax                           // AJR: bugfix 10/8/92\r
 380                 jz      errorxu\r
 381                 jmp     Endxu\r
 382 #ifdef __BORLANDC__\r
 383         }\r
 384 #endif\r
 385                 errorxu:\r
 386 #ifdef __BORLANDC__\r
 387         __asm {\r
 388 #endif\r
 389                 //mov   err,ah\r
 390                 mov     errorflag,1\r
 391                 jmp     Endxu\r
 392 #ifdef __BORLANDC__\r
 393         }\r
 394 #endif\r
 395                 Endxu:\r
 396 #ifdef __WATCOMC__\r
 397         }\r
 398 #endif\r
 399         XMSAvail &= ~(PMPageSizeKB - 1);        // Round off to nearest page size\r
 400         if (XMSAvail < (PMPageSizeKB * 2)){     // Need at least 2 pages\r
 401                 printf("PISS! %u\n", XMSAvail);\r
 402                 goto error;\r
 403         }\r
 404 \r
 405         __asm {\r
 406                 mov     dx,[XMSAvail]\r
 407                 //XMS_CALL(XMS_ALLOC);                          // And do the allocation\r
 408                 mov     ah,XMS_ALLOC\r
 409                 call    [WORD PTR XMSDriver]\r
 410                 mov     [XMSHandle],dx\r
 411                 or      ax,ax                           // AJR: bugfix 10/8/92\r
 412                 jz      errorxuu\r
 413                 jmp     Endxuu\r
 414 #ifdef __BORLANDC__\r
 415                 }\r
 416 #endif\r
 417                 errorxuu:\r
 418 #ifdef __BORLANDC__\r
 419         __asm {\r
 420 #endif\r
 421                 //mov   err,ah\r
 422                 mov     [XMSAvail],0\r
 423                 mov     errorflag,1\r
 424                 jmp     Endxuu\r
 425 #ifdef __BORLANDC__\r
 426         }\r
 427 #endif\r
 428                 Endxuu:\r
 429 #ifdef __WATCOMC__\r
 430         }\r
 431 #endif\r
 432 \r
 433         if(errorflag==false)\r
 434         {\r
 435                 gvar->pm.xmm.XMSAvail = XMSAvail;\r
 436                 gvar->mmi.XMSmem += gvar->pm.xmm.XMSAvail * (dword)1024;\r
 437                 gvar->pm.xmm.XMSHandle = XMSHandle;\r
 438 \r
 439                 gvar->pm.xmm.XMSPresent = true;\r
 440                 printf("        %u      %u      %u\n", gvar->mmi.XMSmem, gvar->pm.xmm.XMSAvail, XMSAvail);\r
 441                 getch();\r
 442         }else printf("  errorflag\n");\r
 443 error:\r
 444         return(gvar->pm.xmm.XMSPresent);\r
 445 }\r
 446 \r
 447 //\r
 448 //      PML_XMSCopy() - Copies a main/EMS page to or from XMS\r
 449 //              Will round an odd-length request up to the next even value\r
 450 //\r
 451 void\r
 452 PML_XMSCopy(boolean toxms,byte far *addr,word xmspage,word length, global_game_variables_t *gvar)\r
 453 {\r
 454         dword   xoffset;\r
 455         struct\r
 456         {\r
 457                 dword   length;\r
 458                 word            source_handle;\r
 459                 dword   source_offset;\r
 460                 word            target_handle;\r
 461                 dword   target_offset;\r
 462         } copy;\r
 463 \r
 464         if (!addr)\r
 465         {\r
 466                 Quit("PML_XMSCopy: zero address\n");\r
 467                 //return;\r
 468         }\r
 469 \r
 470         xoffset = (dword)xmspage * PMPageSize;\r
 471 \r
 472         copy.length = (length + 1) & ~1;\r
 473         copy.source_handle = toxms? 0 : gvar->pm.xmm.XMSHandle;\r
 474         copy.source_offset = toxms? (long)addr : xoffset;\r
 475         copy.target_handle = toxms? gvar->pm.xmm.XMSHandle : 0;\r
 476         copy.target_offset = toxms? xoffset : (long)addr;\r
 477 \r
 478         __asm {\r
 479                 push si\r
 480         }\r
 481         _SI = (word)&copy;\r
 482         XMS_CALL(XMS_MOVE);\r
 483         __asm {\r
 484                 pop     si\r
 485         }\r
 486         if (!_AX)\r
 487         {\r
 488                 Quit("PML_XMSCopy: Error on copy");\r
 489                 //return;\r
 490         }\r
 491 }\r
 492 \r
 493 #if 1\r
 494 #define PML_CopyToXMS(s,t,l,gvar)       PML_XMSCopy(true,(s),(t),(l),(gvar))\r
 495 #define PML_CopyFromXMS(t,s,l,gvar)     PML_XMSCopy(false,(t),(s),(l),(gvar))\r
 496 #else\r
 497 //\r
 498 //      PML_CopyToXMS() - Copies the specified number of bytes from the real mode\r
 499 //              segment address to the specified XMS page\r
 500 //\r
 501 void\r
 502 PML_CopyToXMS(byte far *source,int targetpage,word length,global_game_variables_t *gvar)\r
 503 {\r
 504         PML_XMSCopy(true,source,targetpage,length, global_game_variables_t *gvar);\r
 505 }\r
 506 \r
 507 //\r
 508 //      PML_CopyFromXMS() - Copies the specified number of bytes from an XMS\r
 509 //              page to the specified real mode address\r
 510 //\r
 511 void\r
 512 PML_CopyFromXMS(byte far *target,int sourcepage,word length, global_game_variables_t *gvar)\r
 513 {\r
 514         PML_XMSCopy(false,target,sourcepage,length, global_game_variables_t *gvar);\r
 515 }\r
 516 #endif\r
 517 \r
 518 //\r
 519 //      PML_ShutdownXMS()\r
 520 //\r
 521 void\r
 522 PML_ShutdownXMS(global_game_variables_t *gvar)\r
 523 {\r
 524         boolean errorflag=false;\r
 525         word XMSHandle = gvar->pm.xmm.XMSHandle;\r
 526         if (gvar->pm.xmm.XMSPresent)\r
 527         {\r
 528                 __asm {\r
 529                         mov     dx,[XMSHandle]\r
 530                         //XMS_CALL(XMS_FREE);\r
 531                         mov     ah,XMS_FREE\r
 532                         call    [WORD PTR XMSDriver]\r
 533                         or      bl,bl\r
 534                         jz      errorxs\r
 535                         jmp     Endxs\r
 536 #ifdef __BORLANDC__\r
 537                 }\r
 538 #endif\r
 539                         errorxs:\r
 540 #ifdef __BORLANDC__\r
 541                 __asm {\r
 542 #endif\r
 543                         //mov   err,ah\r
 544                         mov     errorflag,1\r
 545                         jmp     Endxs\r
 546 #ifdef __BORLANDC__\r
 547                 }\r
 548 #endif\r
 549                         Endxs:\r
 550 #ifdef __WATCOMC__\r
 551                 }\r
 552 #endif\r
 553                 if(errorflag==true)\r
 554                 {\r
 555                         Quit("PML_ShutdownXMS: Error freeing XMS");\r
 556                         //return;\r
 557                 }\r
 558         }\r
 559 }\r
 560 \r
 561 /////////////////////////////////////////////////////////////////////////////\r
 562 //\r
 563 //      Main memory code\r
 564 //\r
 565 /////////////////////////////////////////////////////////////////////////////\r
 566 \r
 567 //\r
 568 //      PM_SetMainMemPurge() - Sets the purge level for all allocated main memory\r
 569 //              blocks. This shouldn't be called directly - the PM_LockMainMem() and\r
 570 //              PM_UnlockMainMem() macros should be used instead.\r
 571 //\r
 572 void\r
 573 PM_SetMainMemPurge(int level, global_game_variables_t *gvar)\r
 574 {\r
 575         int     i;\r
 576 \r
 577         if(gvar->pm.mm.MainPresent)\r
 578         for (i = 0;i < PMMaxMainMem;i++)\r
 579         {\r
 580 #ifdef __DEBUG_PM__\r
 581                 printf("PM_SetMainMemPurge()    info of gvar->pm.mm.MainMemPages[i]\n");\r
 582                 printf("&       %Fp,    %Fp\n", &gvar->pm.mm.MainMemPages[i],   &(gvar->pm.mm.MainMemPages[i]));\r
 583 #endif\r
 584                 if (gvar->pm.mm.MainMemPages[i])\r
 585                         MM_SetPurge(&(gvar->pm.mm.MainMemPages[i]),level, gvar);\r
 586         }\r
 587 \r
 588         else\r
 589         {\r
 590                 Quit("MainPresent IS NULL\n");\r
 591         }\r
 592 }\r
 593 \r
 594 //\r
 595 //      PM_CheckMainMem() - If something besides the Page Mgr makes requests of\r
 596 //              the Memory Mgr, some of the Page Mgr's blocks may have been purged,\r
 597 //              so this function runs through the block list and checks to see if\r
 598 //              any of the blocks have been purged. If so, it marks the corresponding\r
 599 //              page as purged & unlocked, then goes through the block list and\r
 600 //              tries to reallocate any blocks that have been purged.\r
 601 //      This routine now calls PM_LockMainMem() to make sure that any allocation\r
 602 //              attempts made during the block reallocation sweep don't purge any\r
 603 //              of the other blocks. Because PM_LockMainMem() is called,\r
 604 //              PM_UnlockMainMem() needs to be called before any other part of the\r
 605 //              program makes allocation requests of the Memory Mgr.\r
 606 //\r
 607 void\r
 608 PM_CheckMainMem(global_game_variables_t *gvar)\r
 609 {\r
 610         boolean                 allocfailed;\r
 611         int                             i,n;\r
 612         memptr                  *p;\r
 613         PMBlockAttr             *used;\r
 614         PageListStruct  far *page;\r
 615 \r
 616         if (!gvar->pm.mm.MainPresent)\r
 617                 return;\r
 618 \r
 619         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 620         {\r
 621                 n = page->mainPage;\r
 622                 if (n != -1)                                            // Is the page using main memory?\r
 623                 {\r
 624                         if (!gvar->pm.mm.MainMemPages[n])                       // Yep, was the block purged?\r
 625                         {\r
 626                                 page->mainPage = -1;            // Yes, mark page as purged & unlocked\r
 627                                 page->locked = pml_Unlocked;\r
 628                         }\r
 629                 }\r
 630         }\r
 631 \r
 632         // Prevent allocation attempts from purging any of our other blocks\r
 633         PM_LockMainMem(gvar);\r
 634         allocfailed = false;\r
 635         for (i = 0,p = gvar->pm.mm.MainMemPages,used = gvar->pm.mm.MainMemUsed; i < PMMaxMainMem;i++,p++,used++)\r
 636         {\r
 637                 if (!*p)                                                        // If the page got purged\r
 638                 {\r
 639                         if (*used & pmba_Allocated)             // If it was allocated\r
 640                         {\r
 641                                 *used &= ~pmba_Allocated;       // Mark as unallocated\r
 642                                 gvar->pm.mm.MainPagesAvail--;                   // and decrease available count\r
 643                         }\r
 644 \r
 645                         if (*used & pmba_Used)                  // If it was used\r
 646                         {\r
 647                                 *used &= ~pmba_Used;            // Mark as unused\r
 648                                 gvar->pm.MainPagesUsed--;                       // and decrease used count\r
 649                         }\r
 650 \r
 651                         if (!allocfailed)\r
 652                         {\r
 653                                 MM_BombOnError(false, gvar);\r
 654                                 MM_GetPtr(p,PMPageSize, gvar);          // Try to reallocate\r
 655                                 if (gvar->mm.mmerror)                                   // If it failed,\r
 656                                         allocfailed = true;                     //  don't try any more allocations\r
 657                                 else                                                    // If it worked,\r
 658                                 {\r
 659                                         *used |= pmba_Allocated;        // Mark as allocated\r
 660                                         gvar->pm.mm.MainPagesAvail++;                   // and increase available count\r
 661                                 }\r
 662                                 MM_BombOnError(true, gvar);\r
 663                         }\r
 664                 }\r
 665         }\r
 666         if (gvar->mm.mmerror)\r
 667                 gvar->mm.mmerror = false;\r
 668 }\r
 669 \r
 670 //\r
 671 //      PML_StartupMainMem() - Allocates as much main memory as is possible for\r
 672 //              the Page Mgr. The memory is allocated as non-purgeable, so if it's\r
 673 //              necessary to make requests of the Memory Mgr, PM_UnlockMainMem()\r
 674 //              needs to be called.\r
 675 //\r
 676 void\r
 677 PML_StartupMainMem(global_game_variables_t *gvar)\r
 678 {\r
 679         int             i,n;\r
 680         memptr  *p;\r
 681 \r
 682         gvar->pm.mm.MainPagesAvail = 0;\r
 683         gvar->pm.mm.MainPresent = false;\r
 684         MM_BombOnError(false, gvar);\r
 685         for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)\r
 686         {\r
 687                 MM_GetPtr(p,PMPageSize, gvar);\r
 688                 if (gvar->mm.mmerror)\r
 689                         break;\r
 690 \r
 691                 gvar->pm.mm.MainPagesAvail++;\r
 692                 gvar->pm.mm.MainMemUsed[i] = pmba_Allocated;\r
 693         }\r
 694         MM_BombOnError(true, gvar);\r
 695         if (gvar->mm.mmerror)\r
 696                 gvar->mm.mmerror = false;\r
 697         if (gvar->pm.mm.MainPagesAvail < PMMinMainMem)\r
 698         {\r
 699                 Quit("PM_SetupMainMem: Not enough main memory");\r
 700                 //return;\r
 701         }\r
 702         gvar->pm.mm.MainPresent = true;\r
 703 }\r
 704 \r
 705 //\r
 706 //      PML_ShutdownMainMem() - Frees all of the main memory blocks used by the\r
 707 //              Page Mgr.\r
 708 //\r
 709 void\r
 710 PML_ShutdownMainMem(global_game_variables_t *gvar)\r
 711 {\r
 712         int             i;\r
 713         memptr  *p;\r
 714 \r
 715         // DEBUG - mark pages as unallocated & decrease page count as appropriate\r
 716         for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)\r
 717                 if (*p)\r
 718                         MM_FreePtr(p, gvar);\r
 719 }\r
 720 \r
 721 /////////////////////////////////////////////////////////////////////////////\r
 722 //\r
 723 //      File management code\r
 724 //\r
 725 /////////////////////////////////////////////////////////////////////////////\r
 726 \r
 727 //\r
 728 //      PML_ReadFromFile() - Reads some data in from the page file\r
 729 //\r
 730 void\r
 731 PML_ReadFromFile(byte far *buf,long offset,word length, global_game_variables_t *gvar)\r
 732 {\r
 733         if (!buf)\r
 734         {\r
 735                 Quit("PML_ReadFromFile: Null pointer");\r
 736                 //return;\r
 737         }\r
 738         if (!offset)\r
 739         {\r
 740                 Quit("PML_ReadFromFile: Zero offset");\r
 741                 //return;\r
 742         }\r
 743         if (lseek(gvar->pm.fi.PageFile,offset,SEEK_SET) != offset)\r
 744         {\r
 745                 Quit("PML_ReadFromFile: Seek failed");\r
 746                 //return;\r
 747         }\r
 748         if (!CA_FarRead(gvar->pm.fi.PageFile,buf,length, gvar))\r
 749         {\r
 750                 Quit("PML_ReadFromFile: Read failed");\r
 751                 //return;\r
 752         }\r
 753 }\r
 754 \r
 755 //\r
 756 //      PML_OpenPageFile() - Opens the page file and sets up the page info\r
 757 //\r
 758 void\r
 759 PML_OpenPageFile(global_game_variables_t *gvar)\r
 760 {\r
 761         int                             i;\r
 762         long                    size;\r
 763                                 //__SEGA buf;\r
 764         memptr          buf;\r
 765         dword           far *offsetptr;\r
 766         word                    far *lengthptr;\r
 767         PageListStruct  far *page;\r
 768 \r
 769         gvar->pm.fi.PageFile = open(gvar->pm.fi.PageFileName,O_RDONLY + O_BINARY);\r
 770         if (gvar->pm.fi.PageFile == -1)\r
 771         {\r
 772                 Quit("PML_OpenPageFile: Unable to open page file");\r
 773                 //return;\r
 774         }\r
 775 \r
 776         // Read in header variables\r
 777         read(gvar->pm.fi.PageFile,&gvar->pm.fi.ChunksInFile,sizeof(gvar->pm.fi.ChunksInFile));\r
 778         read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSpriteStart,sizeof(gvar->pm.fi.PMSpriteStart));\r
 779         read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSoundStart,sizeof(gvar->pm.fi.PMSoundStart));\r
 780 \r
 781         // Allocate and clear the page list\r
 782         gvar->pm.PMNumBlocks = gvar->pm.fi.ChunksInFile;\r
 783         MM_GetPtr((memptr *)gvar->pm.PMSegPages, sizeof(PageListStruct) * (gvar->pm.PMNumBlocks), gvar);\r
 784         MM_SetLock((memptr *)gvar->pm.PMSegPages,true, gvar);\r
 785         gvar->pm.PMPages = (PageListStruct far *)gvar->pm.PMSegPages;\r
 786         _fmemset(gvar->pm.PMPages,0,sizeof(PageListStruct) * gvar->pm.PMNumBlocks);\r
 787 \r
 788         // Read in the chunk offsets\r
 789         size = sizeof(dword) * gvar->pm.fi.ChunksInFile;\r
 790         MM_GetPtr(&buf, size, gvar);\r
 791         if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))\r
 792         {\r
 793                 Quit("PML_OpenPageFile: Offset read failed");\r
 794                 //return;\r
 795         }\r
 796         offsetptr = (dword far *)buf;\r
 797         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 798                 page->offset = *offsetptr++;\r
 799         MM_FreePtr(&buf, gvar);\r
 800 \r
 801         // Read in the chunk lengths\r
 802         size = sizeof(word) * gvar->pm.fi.ChunksInFile;\r
 803         MM_GetPtr(&buf,size, gvar);\r
 804         if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))\r
 805         {\r
 806                 Quit("PML_OpenPageFile: Length read failed");\r
 807                 //return;\r
 808         }\r
 809         lengthptr = (word far *)buf;\r
 810         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 811                 page->length = *lengthptr++;\r
 812         MM_FreePtr(&buf, gvar);\r
 813 }\r
 814 \r
 815 //\r
 816 //  PML_ClosePageFile() - Closes the page file\r
 817 //\r
 818 void\r
 819 PML_ClosePageFile(global_game_variables_t *gvar)\r
 820 {\r
 821         if (gvar->pm.fi.PageFile != -1)\r
 822                 close(gvar->pm.fi.PageFile);\r
 823         if (gvar->pm.PMSegPages)\r
 824         {\r
 825                 MM_SetLock((memptr)gvar->pm.PMSegPages,false, gvar);\r
 826                 MM_FreePtr((memptr)gvar->pm.PMSegPages, gvar);\r
 827         }\r
 828 }\r
 829 \r
 830 /////////////////////////////////////////////////////////////////////////////\r
 831 //\r
 832 //      Allocation, etc., code\r
 833 //\r
 834 /////////////////////////////////////////////////////////////////////////////\r
 835 \r
 836 //\r
 837 //      PML_GetEMSAddress()\r
 838 //\r
 839 //              Page is in EMS, so figure out which EMS physical page should be used\r
 840 //              to map our page in. If normal page, use EMS physical page 3, else\r
 841 //              use the physical page specified by the lock type\r
 842 //\r
 843 #ifndef __DEBUG_2__\r
 844 #pragma argsused        // DEBUG - remove lock parameter\r
 845 memptr\r
 846 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)\r
 847 {\r
 848         int             i,emspage;\r
 849         word    emsoff,emsbase,offset;\r
 850 \r
 851         emsoff = page & (PMEMSSubPage - 1);\r
 852         emsbase = page - emsoff;\r
 853 \r
 854         emspage = -1;\r
 855         // See if this page is already mapped in\r
 856         for (i = 0;i < EMSFrameCount;i++)\r
 857         {\r
 858                 if (gvar->pm.emm.EMSList[i].baseEMSPage == emsbase)\r
 859                 {\r
 860                         emspage = i;    // Yep - don't do a redundant remapping\r
 861                         break;\r
 862                 }\r
 863         }\r
 864 \r
 865         // If page isn't already mapped in, find LRU EMS frame, and use it\r
 866         if (emspage == -1)\r
 867         {\r
 868                 dword last = LONG_MAX;\r
 869                 for (i = 0;i < EMSFrameCount;i++)\r
 870                 {\r
 871                         if (gvar->pm.emm.EMSList[i].lastHit < last)\r
 872                         {\r
 873                                 emspage = i;\r
 874                                 last = gvar->pm.emm.EMSList[i].lastHit;\r
 875                         }\r
 876                 }\r
 877 \r
 878                 gvar->pm.emm.EMSList[emspage].baseEMSPage = emsbase;\r
 879                 PML_MapEMS(page / PMEMSSubPage,emspage, gvar);\r
 880         }\r
 881 \r
 882         if (emspage == -1)\r
 883                 Quit("PML_GetEMSAddress: EMS find failed");\r
 884 \r
 885         gvar->pm.emm.EMSList[emspage].lastHit = gvar->pm.PMFrameCount;\r
 886         offset = emspage * EMSPageSizeSeg;\r
 887         offset += emsoff * PMPageSizeSeg;\r
 888         return((memptr)(gvar->pm.emm.EMSPageFrame + offset));\r
 889 }\r
 890 #else\r
 891 memptr\r
 892 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)\r
 893 {\r
 894         word    emspage;\r
 895 \r
 896         emspage = (lock < pml_EMSLock)? 3 : (lock - pml_EMSLock);\r
 897 \r
 898         PML_MapEMS(page / PMEMSSubPage,emspage);\r
 899 \r
 900         return((memptr)(EMSPageFrame + (emspage * EMSPageSizeSeg)\r
 901                         + ((page & (PMEMSSubPage - 1)) * PMPageSizeSeg)));\r
 902 }\r
 903 #endif\r
 904 \r
 905 //\r
 906 //      PM_GetPageAddress() - Returns the address of a given page\r
 907 //              Maps in EMS if necessary\r
 908 //              Returns nil if block isn't cached into Main Memory or EMS\r
 909 //\r
 910 //\r
 911 memptr\r
 912 PM_GetPageAddress(int pagenum, global_game_variables_t *gvar)\r
 913 {\r
 914         PageListStruct  far *page;\r
 915 \r
 916         page = &gvar->pm.PMPages[pagenum];\r
 917         if (page->mainPage != -1)\r
 918                 return(gvar->pm.mm.MainMemPages[page->mainPage]);\r
 919         else if (page->emsPage != -1)\r
 920                 return(PML_GetEMSAddress(page->emsPage,page->locked, gvar));\r
 921         else\r
 922                 return(nil);\r
 923 }\r
 924 \r
 925 //\r
 926 //      PML_GiveLRUPage() - Returns the page # of the least recently used\r
 927 //              present & unlocked main/EMS page (or main page if mainonly is true)\r
 928 //\r
 929 int\r
 930 PML_GiveLRUPage(boolean mainonly, global_game_variables_t *gvar)\r
 931 {\r
 932         int                             i,lru;\r
 933         long                    last;\r
 934         PageListStruct  far *page;\r
 935 \r
 936         for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 937         {\r
 938                 if\r
 939                 (\r
 940                         (page->lastHit < last)\r
 941                 &&      ((page->emsPage != -1) || (page->mainPage != -1))\r
 942                 &&      (page->locked == pml_Unlocked)\r
 943                 &&      (!(mainonly && (page->mainPage == -1)))\r
 944                 )\r
 945                 {\r
 946                         last = page->lastHit;\r
 947                         lru = i;\r
 948                 }\r
 949         }\r
 950 \r
 951         if (lru == -1)\r
 952                 Quit("PML_GiveLRUPage: LRU Search failed");\r
 953         return(lru);\r
 954 }\r
 955 \r
 956 //\r
 957 //      PML_GiveLRUXMSPage() - Returns the page # of the least recently used\r
 958 //              (and present) XMS page.\r
 959 //      This routine won't return the XMS page protected (by XMSProtectPage)\r
 960 //\r
 961 int\r
 962 PML_GiveLRUXMSPage(global_game_variables_t *gvar)\r
 963 {\r
 964         int                             i,lru;\r
 965         long                    last;\r
 966         PageListStruct  far *page;\r
 967 \r
 968         for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 969         {\r
 970                 if\r
 971                 (\r
 972                         (page->xmsPage != -1)\r
 973                 &&      (page->lastHit < last)\r
 974                 &&      (i != gvar->pm.xmm.XMSProtectPage)\r
 975                 )\r
 976                 {\r
 977                         last = page->lastHit;\r
 978                         lru = i;\r
 979                 }\r
 980         }\r
 981         return(lru);\r
 982 }\r
 983 \r
 984 //\r
 985 //      PML_PutPageInXMS() - If page isn't in XMS, find LRU XMS page and replace\r
 986 //              it with the main/EMS page\r
 987 //\r
 988 void\r
 989 PML_PutPageInXMS(int pagenum, global_game_variables_t *gvar)\r
 990 {\r
 991         int                             usexms;\r
 992         PageListStruct  far *page;\r
 993 \r
 994         if (!gvar->pm.xmm.XMSPresent)\r
 995                 return;\r
 996 \r
 997         page = &gvar->pm.PMPages[pagenum];\r
 998         if (page->xmsPage != -1)\r
 999                 return;                                 // Already in XMS\r
1000 \r
1001         if (gvar->pm.XMSPagesUsed < gvar->pm.xmm.XMSPagesAvail)\r
1002                 page->xmsPage = gvar->pm.XMSPagesUsed++;\r
1003         else\r
1004         {\r
1005                 usexms = PML_GiveLRUXMSPage(gvar);\r
1006                 if (usexms == -1)\r
1007                         Quit("PML_PutPageInXMS: No XMS LRU");\r
1008                 page->xmsPage = gvar->pm.PMPages[usexms].xmsPage;\r
1009                 gvar->pm.PMPages[usexms].xmsPage = -1;\r
1010         }\r
1011         PML_CopyToXMS(PM_GetPageAddress(pagenum, gvar),page->xmsPage,page->length, gvar);\r
1012 }\r
1013 \r
1014 //\r
1015 //      PML_TransferPageSpace() - A page is being replaced, so give the new page\r
1016 //              the old one's address space. Returns the address of the new page.\r
1017 //\r
1018 memptr\r
1019 PML_TransferPageSpace(int orig,int new, global_game_variables_t *gvar)\r
1020 {\r
1021         memptr                  addr;\r
1022         PageListStruct  far *origpage,far *newpage;\r
1023 \r
1024         if (orig == new)\r
1025                 Quit("PML_TransferPageSpace: Identity replacement");\r
1026 \r
1027         origpage = &gvar->pm.PMPages[orig];\r
1028         newpage = &gvar->pm.PMPages[new];\r
1029 \r
1030         if (origpage->locked != pml_Unlocked)\r
1031                 Quit("PML_TransferPageSpace: Killing locked page");\r
1032 \r
1033         if ((origpage->emsPage == -1) && (origpage->mainPage == -1))\r
1034                 Quit("PML_TransferPageSpace: Reusing non-existent page");\r
1035 \r
1036         // Copy page that's about to be purged into XMS\r
1037         PML_PutPageInXMS(orig, gvar);\r
1038 \r
1039         // Get the address, and force EMS into a physical page if necessary\r
1040         addr = PM_GetPageAddress(orig, gvar);\r
1041 \r
1042         // Steal the address\r
1043         newpage->emsPage = origpage->emsPage;\r
1044         newpage->mainPage = origpage->mainPage;\r
1045 \r
1046         // Mark replaced page as purged\r
1047         origpage->mainPage = origpage->emsPage = -1;\r
1048 \r
1049         if (!addr)\r
1050                 Quit("PML_TransferPageSpace: Zero replacement");\r
1051 \r
1052         return(addr);\r
1053 }\r
1054 \r
1055 //\r
1056 //      PML_GetAPageBuffer() - A page buffer is needed. Either get it from the\r
1057 //              main/EMS free pool, or use PML_GiveLRUPage() to find which page to\r
1058 //              steal the buffer from. Returns a far pointer to the page buffer, and\r
1059 //              sets the fields inside the given page structure appropriately.\r
1060 //              If mainonly is true, free EMS will be ignored, and only main pages\r
1061 //              will be looked at by PML_GiveLRUPage().\r
1062 //\r
1063 byte far *\r
1064 PML_GetAPageBuffer(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
1065 {\r
1066         byte                    far *addr = nil;\r
1067         int                             i,n;\r
1068         PMBlockAttr             *used;\r
1069         PageListStruct  far *page;\r
1070 \r
1071         page = &gvar->pm.PMPages[pagenum];\r
1072         if ((gvar->pm.EMSPagesUsed < gvar->pm.emm.EMSPagesAvail) && !mainonly)\r
1073         {\r
1074                 // There's remaining EMS - use it\r
1075                 page->emsPage = gvar->pm.EMSPagesUsed++;\r
1076                 addr = PML_GetEMSAddress(page->emsPage,page->locked, gvar);\r
1077         }\r
1078         else if (gvar->pm.MainPagesUsed < gvar->pm.mm.MainPagesAvail)\r
1079         {\r
1080                 // There's remaining main memory - use it\r
1081                 for (i = 0,n = -1,used = gvar->pm.mm.MainMemUsed;i < PMMaxMainMem;i++,used++)\r
1082                 {\r
1083                         if ((*used & pmba_Allocated) && !(*used & pmba_Used))\r
1084                         {\r
1085                                 n = i;\r
1086                                 *used |= pmba_Used;\r
1087                                 break;\r
1088                         }\r
1089                 }\r
1090                 if (n == -1)\r
1091                         Quit("PML_GetPageBuffer: MainPagesAvail lied");\r
1092                 addr = gvar->pm.mm.MainMemPages[n];\r
1093                 if (!addr)\r
1094                         Quit("PML_GetPageBuffer: Purged main block");\r
1095                 page->mainPage = n;\r
1096                 gvar->pm.MainPagesUsed++;\r
1097         }\r
1098         else\r
1099                 addr = PML_TransferPageSpace(PML_GiveLRUPage(mainonly, gvar),pagenum, gvar);\r
1100 \r
1101         if (!addr)\r
1102                 Quit("PML_GetPageBuffer: Search failed");\r
1103         return(addr);\r
1104 }\r
1105 \r
1106 //\r
1107 //      PML_GetPageFromXMS() - If page is in XMS, find LRU main/EMS page and\r
1108 //              replace it with the page from XMS. If mainonly is true, will only\r
1109 //              search for LRU main page.\r
1110 //      XMSProtectPage is set to the page to be retrieved from XMS, so that if\r
1111 //              the page from which we're stealing the main/EMS from isn't in XMS,\r
1112 //              it won't copy over the page that we're trying to get from XMS.\r
1113 //              (pages that are being purged are copied into XMS, if possible)\r
1114 //\r
1115 memptr\r
1116 PML_GetPageFromXMS(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
1117 {\r
1118         byte                    far *checkaddr;\r
1119         memptr                  addr = nil;\r
1120         PageListStruct  far *page;\r
1121 \r
1122         page = &gvar->pm.PMPages[pagenum];\r
1123         if (gvar->pm.xmm.XMSPresent && (page->xmsPage != -1))\r
1124         {\r
1125                 gvar->pm.xmm.XMSProtectPage = pagenum;\r
1126                 checkaddr = PML_GetAPageBuffer(pagenum,mainonly, gvar);\r
1127                 if (FP_OFF(checkaddr))\r
1128                         Quit("PML_GetPageFromXMS: Non segment pointer");\r
1129                 addr = (memptr)FP_SEG(checkaddr);\r
1130                 PML_CopyFromXMS(addr,page->xmsPage,page->length, gvar);\r
1131                 gvar->pm.xmm.XMSProtectPage = -1;\r
1132         }\r
1133 \r
1134         return(addr);\r
1135 }\r
1136 \r
1137 //\r
1138 //      PML_LoadPage() - A page is not in main/EMS memory, and it's not in XMS.\r
1139 //              Load it into either main or EMS. If mainonly is true, the page will\r
1140 //              only be loaded into main.\r
1141 //\r
1142 void\r
1143 PML_LoadPage(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
1144 {\r
1145         byte                    far *addr;\r
1146         PageListStruct  far *page;\r
1147 \r
1148         addr = PML_GetAPageBuffer(pagenum,mainonly, gvar);\r
1149         page = &gvar->pm.PMPages[pagenum];\r
1150         PML_ReadFromFile(addr,page->offset,page->length, gvar);\r
1151 }\r
1152 \r
1153 //\r
1154 //      PM_GetPage() - Returns the address of the page, loading it if necessary\r
1155 //              First, check if in Main Memory or EMS\r
1156 //              Then, check XMS\r
1157 //              If not in XMS, load into Main Memory or EMS\r
1158 //\r
1159 #pragma warn -pia\r
1160 memptr\r
1161 PM_GetPage(int pagenum, global_game_variables_t *gvar)\r
1162 {\r
1163         memptr  result;\r
1164 \r
1165         if (pagenum >= gvar->pm.fi.ChunksInFile)\r
1166                 Quit("PM_GetPage: Invalid page request");\r
1167 \r
1168 #ifdef __DEBUG_2__      // for debugging\r
1169         __asm {\r
1170                 mov     dx,STATUS_REGISTER_1\r
1171                 in      al,dx\r
1172                 mov     dx,ATR_INDEX\r
1173                 mov     al,ATR_OVERSCAN\r
1174                 out     dx,al\r
1175                 mov     al,10   // bright green\r
1176                 out     dx,al\r
1177         }\r
1178 #endif\r
1179 \r
1180         if (!(result = PM_GetPageAddress(pagenum, gvar)))\r
1181         {\r
1182                 boolean mainonly = (pagenum >= gvar->pm.fi.PMSoundStart);\r
1183 if (!gvar->pm.PMPages[pagenum].offset)  // JDC: sparse page\r
1184         Quit ("Tried to load a sparse page!");\r
1185                 if (!(result = PML_GetPageFromXMS(pagenum,mainonly, gvar)))\r
1186                 {\r
1187                         if (gvar->pm.PMPages[pagenum].lastHit ==  gvar->pm.PMFrameCount)\r
1188                                 gvar->pm.PMThrashing++;\r
1189 \r
1190                         PML_LoadPage(pagenum,mainonly, gvar);\r
1191                         result = PM_GetPageAddress(pagenum, gvar);\r
1192                 }\r
1193         }\r
1194         gvar->pm.PMPages[pagenum].lastHit =  gvar->pm.PMFrameCount;\r
1195 \r
1196 #ifdef __DEBUG_2__      // for debugging\r
1197         __asm{\r
1198                 mov     dx,STATUS_REGISTER_1\r
1199                 in      al,dx\r
1200                 mov     dx,ATR_INDEX\r
1201                 mov     al,ATR_OVERSCAN\r
1202                 out     dx,al\r
1203                 mov     al,3    // blue\r
1204                 out     dx,al\r
1205                 mov     al,0x20 // normal\r
1206                 out     dx,al\r
1207 #endif\r
1208 \r
1209         return(result);\r
1210 }\r
1211 #pragma warn +pia\r
1212 \r
1213 //\r
1214 //      PM_SetPageLock() - Sets the lock type on a given page\r
1215 //              pml_Unlocked: Normal, page can be purged\r
1216 //              pml_Locked: Cannot be purged\r
1217 //              pml_EMS?: Same as pml_Locked, but if in EMS, use the physical page\r
1218 //                                      specified when returning the address. For sound stuff.\r
1219 //\r
1220 void\r
1221 PM_SetPageLock(int pagenum,PMLockType lock, global_game_variables_t *gvar)\r
1222 {\r
1223         if (pagenum < gvar->pm.fi.PMSoundStart)\r
1224                 Quit("PM_SetPageLock: Locking/unlocking non-sound page");\r
1225 \r
1226         gvar->pm.PMPages[pagenum].locked = lock;\r
1227 }\r
1228 \r
1229 //\r
1230 //      PM_Preload() - Loads as many pages as possible into all types of memory.\r
1231 //              Calls the update function after each load, indicating the current\r
1232 //              page, and the total pages that need to be loaded (for thermometer).\r
1233 //\r
1234 void\r
1235 PM_Preload(boolean (*update)(word current,word total), global_game_variables_t *gvar)\r
1236 {\r
1237         int                             i,j,\r
1238                                         page,oogypage;\r
1239         word                    current,total,\r
1240                                         totalnonxms,totalxms,\r
1241                                         mainfree,maintotal,\r
1242                                         emsfree,emstotal,\r
1243                                         xmsfree,xmstotal;\r
1244         memptr                  addr;\r
1245         PageListStruct  far *p;\r
1246 \r
1247         mainfree = (gvar->pm.mm.MainPagesAvail - gvar->pm.MainPagesUsed) + (gvar->pm.emm.EMSPagesAvail - gvar->pm.EMSPagesUsed);\r
1248         xmsfree = (gvar->pm.xmm.XMSPagesAvail - gvar->pm.XMSPagesUsed);\r
1249 \r
1250         xmstotal = maintotal = 0;\r
1251 \r
1252         for (i = 0;i < gvar->pm.fi.ChunksInFile;i++)\r
1253         {\r
1254                 if (!gvar->pm.PMPages[i].offset)\r
1255                         continue;                       // sparse\r
1256 \r
1257                 if ( gvar->pm.PMPages[i].emsPage != -1 || gvar->pm.PMPages[i].mainPage != -1 )\r
1258                         continue;                       // already in main mem\r
1259 \r
1260                 if ( mainfree )\r
1261                 {\r
1262                         maintotal++;\r
1263                         mainfree--;\r
1264                 }\r
1265                 else if ( xmsfree && (gvar->pm.PMPages[i].xmsPage == -1) )\r
1266                 {\r
1267                         xmstotal++;\r
1268                         xmsfree--;\r
1269                 }\r
1270         }\r
1271 \r
1272 \r
1273         total = maintotal + xmstotal;\r
1274 \r
1275         if (!total)\r
1276                 return;\r
1277 \r
1278         page = 0;\r
1279         current = 0;\r
1280 \r
1281 //\r
1282 // cache main/ems blocks\r
1283 //\r
1284         while (maintotal)\r
1285         {\r
1286                 while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].mainPage != -1\r
1287                         ||      gvar->pm.PMPages[page].emsPage != -1 )\r
1288                         page++;\r
1289 \r
1290                 if (page >= gvar->pm.fi.ChunksInFile)\r
1291                         Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");\r
1292 \r
1293                 PM_GetPage(page, gvar);\r
1294 \r
1295                 page++;\r
1296                 current++;\r
1297                 maintotal--;\r
1298                 update(current,total);\r
1299         }\r
1300 \r
1301 //\r
1302 // load stuff to XMS\r
1303 //\r
1304         if (xmstotal)\r
1305         {\r
1306                 for (oogypage = 0 ; gvar->pm.PMPages[oogypage].mainPage == -1 ; oogypage++)\r
1307                 ;\r
1308                 addr = PM_GetPage(oogypage, gvar);\r
1309                 if (!addr)\r
1310                         Quit("PM_Preload: XMS buffer failed");\r
1311 \r
1312                 while (xmstotal)\r
1313                 {\r
1314                         while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].xmsPage != -1 )\r
1315                                 page++;\r
1316 \r
1317                         if (page >= gvar->pm.fi.ChunksInFile)\r
1318                                 Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");\r
1319 \r
1320                         p = &gvar->pm.PMPages[page];\r
1321 \r
1322                         p->xmsPage = gvar->pm.XMSPagesUsed++;\r
1323                         if (gvar->pm.XMSPagesUsed > gvar->pm.xmm.XMSPagesAvail)\r
1324                                 Quit("PM_Preload: Exceeded XMS pages");\r
1325                         if (p->length > PMPageSize)\r
1326                                 Quit("PM_Preload: Page too long");\r
1327 \r
1328                         PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);\r
1329                         PML_CopyToXMS((byte far *)addr,p->xmsPage,p->length, gvar);\r
1330 \r
1331                         page++;\r
1332                         current++;\r
1333                         xmstotal--;\r
1334                         update(current,total);\r
1335                 }\r
1336 \r
1337                 p = &gvar->pm.PMPages[oogypage];\r
1338                 PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);\r
1339         }\r
1340 \r
1341         update(total,total);\r
1342 }\r
1343 \r
1344 /////////////////////////////////////////////////////////////////////////////\r
1345 //\r
1346 //      General code\r
1347 //\r
1348 /////////////////////////////////////////////////////////////////////////////\r
1349 \r
1350 //\r
1351 //      PM_NextFrame() - Increments the frame counter and adjusts the thrash\r
1352 //              avoidence variables\r
1353 //\r
1354 //              If currently in panic mode (to avoid thrashing), check to see if the\r
1355 //                      appropriate number of frames have passed since the last time that\r
1356 //                      we would have thrashed. If so, take us out of panic mode.\r
1357 //\r
1358 //\r
1359 void\r
1360 PM_NextFrame(global_game_variables_t *gvar)\r
1361 {\r
1362         int     i;\r
1363 \r
1364         // Frame count overrun - kill the LRU hit entries & reset frame count\r
1365         if (++gvar->pm.PMFrameCount >= LONG_MAX - 4)\r
1366         {\r
1367                 for (i = 0;i < gvar->pm.PMNumBlocks;i++)\r
1368                         gvar->pm.PMPages[i].lastHit = 0;\r
1369                 gvar->pm.PMFrameCount = 0;\r
1370         }\r
1371 \r
1372 //#if 0\r
1373         for (i = 0;i < gvar->pm.fi.PMSoundStart;i++)\r
1374         {\r
1375                 if (gvar->pm.PMPages[i].locked)\r
1376                 {\r
1377                         char buf[40];\r
1378                         sprintf(buf,"PM_NextFrame: Page %d is locked",i);\r
1379                         Quit(buf);\r
1380                 }\r
1381         }\r
1382 //#endif\r
1383 \r
1384         if (gvar->pm.PMPanicMode)\r
1385         {\r
1386                 // DEBUG - set border color\r
1387                 if ((!gvar->pm.PMThrashing) && (!--gvar->pm.PMPanicMode))\r
1388                 {\r
1389                         // DEBUG - reset border color\r
1390                 }\r
1391         }\r
1392         if (gvar->pm.PMThrashing >= PMThrashThreshold)\r
1393                 gvar->pm.PMPanicMode = PMUnThrashThreshold;\r
1394         gvar->pm.PMThrashing = false;\r
1395 }\r
1396 \r
1397 //\r
1398 //      PM_Reset() - Sets up caching structures\r
1399 //\r
1400 void\r
1401 PM_Reset(global_game_variables_t *gvar)\r
1402 {\r
1403         int                             i;\r
1404         PageListStruct  far *page;\r
1405 \r
1406         gvar->pm.xmm.XMSPagesAvail = gvar->pm.xmm.XMSAvail / PMPageSizeKB;\r
1407 \r
1408         gvar->pm.emm.EMSPagesAvail = gvar->pm.emm.EMSAvail * (EMSPageSizeKB / PMPageSizeKB);\r
1409         gvar->pm.emm.EMSPhysicalPage = 0;\r
1410 \r
1411         gvar->pm.MainPagesUsed = gvar->pm.EMSPagesUsed = gvar->pm.XMSPagesUsed = 0;\r
1412 \r
1413         gvar->pm.PMPanicMode = false;\r
1414 \r
1415         gvar->pm.fi.PageFile = -1;\r
1416         gvar->pm.xmm.XMSProtectPage = -1;\r
1417 \r
1418         // Initialize page list\r
1419         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.PMNumBlocks;i++,page++)\r
1420         {\r
1421                 page->mainPage = -1;\r
1422                 page->emsPage = -1;\r
1423                 page->xmsPage = -1;\r
1424                 page->locked = false;\r
1425         }\r
1426 }\r
1427 \r
1428 //\r
1429 //      PM_Startup() - Start up the Page Mgr\r
1430 //\r
1431 void\r
1432 PM_Startup(global_game_variables_t *gvar)\r
1433 {\r
1434         boolean nomain,noems,noxms;\r
1435         int             i;\r
1436 \r
1437         if (gvar->pm.PMStarted)\r
1438                 return;\r
1439 \r
1440         //strcpy(&(gvar->pm.fi.PageFileName), "VSWAP.");\r
1441 \r
1442         nomain = noems = noxms = false;\r
1443         for (i = 1;i <\r
1444 #ifdef __WATCOMC__\r
1445         __argc\r
1446 #endif\r
1447 #ifdef __BORLANDC__\r
1448         _argc\r
1449 #endif\r
1450         ;i++)\r
1451         {\r
1452                 switch (US_CheckParm(\r
1453 #ifdef __WATCOMC__\r
1454         __argv[i]\r
1455 #endif\r
1456 #ifdef __BORLANDC__\r
1457         _argv[i]\r
1458 #endif\r
1459                 ,ParmStrings))\r
1460                 {\r
1461                 case 0:\r
1462                         nomain = true;\r
1463                         break;\r
1464                 case 1:\r
1465                         noems = true;\r
1466                         break;\r
1467                 case 2:\r
1468                         noxms = true;\r
1469                         break;\r
1470                 }\r
1471         }\r
1472 \r
1473         //0000+=+=PML_OpenPageFile(gvar);\r
1474 \r
1475         if (!noems)\r
1476                 PML_StartupEMS(gvar);\r
1477         if (!noxms)\r
1478                 PML_StartupXMS(gvar);\r
1479 \r
1480         if (!nomain && !gvar->pm.emm.EMSPresent)\r
1481         {\r
1482                 printf("PM_Startup: No main or EMS\n");\r
1483                 exit(-5);\r
1484                 //return;\r
1485         }\r
1486         PML_StartupMainMem(gvar);\r
1487 \r
1488         PM_Reset(gvar);\r
1489 \r
1490         gvar->pm.PMStarted = true;\r
1491 }\r
1492 \r
1493 //\r
1494 //      PM_Shutdown() - Shut down the Page Mgr\r
1495 //\r
1496 void\r
1497 PM_Shutdown(global_game_variables_t *gvar)\r
1498 {\r
1499         PML_ShutdownXMS(gvar);\r
1500         PML_ShutdownEMS(gvar);\r
1501 \r
1502         if (!gvar->pm.PMStarted)\r
1503                 return;\r
1504 \r
1505         PML_ClosePageFile(gvar);\r
1506 \r
1507         PML_ShutdownMainMem(gvar);\r
1508 }\r