src/lib/16_pm.c

   1 /* Project 16 Source Code~\r
   2  * Copyright (C) 2012-2017 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 //      Main Mem specific variables\r
  33         //boolean                       MainPresent;\r
  34 /*      memptr                  MainMemPages[PMMaxMainMem];\r
  35         PMBlockAttr             gvar->pm.mm.MainMemUsed[PMMaxMainMem];\r
  36         int                             gvar->pm.mm.MainPagesAvail;*/\r
  37 \r
  38 //      EMS specific variables\r
  39         //boolean                       EMSPresent;\r
  40 /*      word                    gvar->pm.emm.EMSAvail,gvar->pm.emm.EMSPagesAvail,gvar->pm.emm.EMSHandle,\r
  41                                         gvar->pm.emm.EMSPageFrame,gvar->pm.emm.EMSPhysicalPage;\r
  42         gvar->pm.emm.EMSListStruct      gvar->pm.emm.EMSList[EMSFrameCount];*/\r
  43 \r
  44 //      XMS specific variables\r
  45         //boolean                       XMSPresent;\r
  46         //word                  gvar->pm.xmm.XMSAvail,gvar->pm.xmm.XMSPagesAvail,gvar->pm.xmm.XMSHandle;\r
  47         dword                   XMSDriver;      //hard to put in gvar\r
  48         word                            XMSVer; //hard to put in gvar\r
  49 /*      int                             gvar->pm.xmm.XMSProtectPage = -1;\r
  50 \r
  51 //      File specific variables\r
  52         char                    gvar->pm.fi.PageFileName[13] = {"VSWAP."};\r
  53         int                             PageFile = -1;\r
  54         word                    gvar->pm.fi.ChunksInFile;\r
  55         word                    PMSpriteStart,PMSoundStart;*/\r
  56 \r
  57 //      General usage variables\r
  58 /*      boolean                 PMStarted,\r
  59                                         gvar->pm.PMPanicMode,\r
  60                                         gvar->pm.PMThrashing;\r
  61         word                    gvar->pm.XMSPagesUsed,\r
  62                                         gvar->pm.EMSPagesUsed,\r
  63                                         MainPagesUsed,\r
  64                                         gvar->pm.PMNumBlocks;\r
  65         long                    PMFrameCount;\r
  66         PageListStruct  far *gvar->pm.PMPages,\r
  67                                         _seg *gvar->pm.PMSegPages;*/\r
  68 \r
  69 static union REGS CPURegs;\r
  70 \r
  71 #define _AX CPURegs.x.ax\r
  72 #define _BX CPURegs.x.bx\r
  73 #define _CX CPURegs.x.cx\r
  74 #define _DX CPURegs.x.dx\r
  75 \r
  76 #define _SI CPURegs.x.si\r
  77 \r
  78 #define _AH CPURegs.h.ah\r
  79 #define _AL CPURegs.h.al\r
  80 #define _BH CPURegs.h.bh\r
  81 #define _BL CPURegs.h.bl\r
  82 #define _CH CPURegs.h.ch\r
  83 #define _CL CPURegs.h.cl\r
  84 #define _DH CPURegs.h.dh\r
  85 #define _DL CPURegs.h.dl\r
  86 \r
  87 #ifdef __WATCOMC__\r
  88 #define geninterrupt(n) int86(n,&CPURegs,&CPURegs);\r
  89 #endif\r
  90 \r
  91 static  char            *ParmStrings[] = {"nomain","noems","noxms",nil};\r
  92 \r
  93 /////////////////////////////////////////////////////////////////////////////\r
  94 //\r
  95 //      EMS Management code\r
  96 //\r
  97 /////////////////////////////////////////////////////////////////////////////\r
  98 \r
  99 //\r
 100 //      PML_MapEMS() - Maps a logical page to a physical page\r
 101 //\r
 102 byte\r
 103 PML_MapEMS(word logical, byte physical, global_game_variables_t *gvar)\r
 104 {\r
 105         byte    err=0, str[160];\r
 106         unsigned        EMShandle;\r
 107         //int   i;\r
 108 \r
 109         boolean errorflag=false;\r
 110         EMShandle=gvar->pm.emm.EMSHandle;\r
 111 \r
 112         __asm {\r
 113                 mov     ah,EMS_MAPPAGE\r
 114                 mov     al,physical\r
 115                 mov     bx,logical\r
 116                 mov     dx,EMShandle\r
 117                 int     EMS_INT\r
 118                 or      ah,ah\r
 119                 jnz     errorme\r
 120                 jmp     Endme\r
 121 #ifdef __BORLANDC__\r
 122         }\r
 123 #endif\r
 124                 errorme:\r
 125 #ifdef __BORLANDC__\r
 126         __asm {\r
 127 #endif\r
 128                 mov     err,ah\r
 129                 mov     errorflag,1\r
 130 #ifdef __BORLANDC__\r
 131         }\r
 132 #endif\r
 133                 Endme:\r
 134 #ifdef __WATCOMC__\r
 135         }\r
 136 #endif\r
 137         if(errorflag==true)\r
 138         {\r
 139                 strcpy(str,"MM_MapEMS: EMS error ");\r
 140                 MM_EMSerr(str, err);\r
 141                 printf("%s\n",str);\r
 142                 Quit ("PML_MapEMS: Page mapping failed\n");\r
 143                 return err;\r
 144         }\r
 145         return 0;\r
 146 }\r
 147 \r
 148 //\r
 149 //      PML_StartupEMS() - Sets up EMS for Page Mgr's use\r
 150 //              Checks to see if EMS driver is present\r
 151 //      Verifies that EMS hardware is present\r
 152 //              Make sure that EMS version is 3.2 or later\r
 153 //              If there's more than our minimum (2 pages) available, allocate it (up\r
 154 //                      to the maximum we need)\r
 155 //\r
 156 //      Please call MML_CheckForEMS() before calling this function.\r
 157 //      MML_CheckForEMS is not local despite the name wwww.\r
 158 //\r
 159 \r
 160 boolean\r
 161 PML_StartupEMS(global_game_variables_t *gvar)\r
 162 {\r
 163         int             i;\r
 164 #ifdef __PM__NOHOGEMS__\r
 165         long    size;\r
 166 #endif\r
 167         byte    err=0, str[64];\r
 168 \r
 169         boolean errorflag=false;\r
 170         unsigned        EMSVer;\r
 171         unsigned        totalEMSpages,freeEMSpages,EMSPageFrame,EMSHandle,EMSAvail;\r
 172         totalEMSpages = freeEMSpages = EMSPageFrame = EMSHandle = EMSAvail = EMSVer = 0;        // set all to 0~\r
 173         gvar->pm.emm.EMSPresent = false;                        // Assume that we'll fail\r
 174         gvar->pm.emm.EMSAvail = gvar->mmi.EMSmem = 0;\r
 175 \r
 176         __asm {\r
 177                 //MML_CheckForEMS() takes care of what the code did here\r
 178                 mov     ah,EMS_STATUS\r
 179                 int     EMS_INT\r
 180                 jc      error1                  // make sure EMS hardware is present\r
 181 \r
 182                 mov     ah,EMS_VERSION\r
 183                 int     EMS_INT                 // only work on EMS 3.2 or greater (silly, but...)\r
 184                 or      ah,ah\r
 185                 jnz     error1\r
 186                 mov     [EMSVer],ax             // set EMSVer\r
 187                 cmp     al,0x32                 // only work on ems 3.2 or greater\r
 188                 jb      error1\r
 189 \r
 190                 mov     ah,EMS_GETFRAME\r
 191                 int     EMS_INT                 // find the page frame address\r
 192                 or      ah,ah\r
 193                 jnz     error1\r
 194                 mov     [EMSPageFrame],bx\r
 195 \r
 196                 mov     ah,EMS_GETPAGES\r
 197                 int     EMS_INT                 // find out how much EMS is there\r
 198                 or      ah,ah\r
 199                 jnz     error1\r
 200                 or      bx,bx\r
 201                 jz      noEMS                   // no EMS at all to allocate\r
 202                 cmp     bx,2\r
 203                 jl      noEMS                   // Require at least 2 pages (32k)\r
 204                 mov     [totalEMSpages],dx\r
 205                 mov     [freeEMSpages],bx\r
 206                 mov     [EMSAvail],bx\r
 207                 jmp     End1\r
 208 #ifdef __BORLANDC__\r
 209         }\r
 210 #endif\r
 211         error1:\r
 212 #ifdef __BORLANDC__\r
 213         __asm {\r
 214 #endif\r
 215                 mov     err,ah\r
 216                 mov     errorflag,1\r
 217                 jmp     End1\r
 218 #ifdef __BORLANDC__\r
 219         }\r
 220 #endif\r
 221 noEMS:\r
 222 End1:\r
 223 #ifdef __WATCOMC__\r
 224         }\r
 225 #endif\r
 226 #ifdef __PM__NOHOGEMS__\r
 227         if(errorflag==false)\r
 228         {\r
 229                 // Don't hog all available EMS\r
 230                 size = gvar->pm.emm.EMSAvail * (long)EMSPageSize;\r
 231                 if (size - (EMSPageSize * 2) > (gvar->pm.fi.ChunksInFile * (long)PMPageSize))\r
 232                 {\r
 233                         size = (gvar->pm.fi.ChunksInFile * (long)PMPageSize) + EMSPageSize;\r
 234                         gvar->pm.emm.EMSAvail = size / EMSPageSize;\r
 235                 }\r
 236         }\r
 237 #endif\r
 238         __asm {\r
 239                 mov     ah,EMS_ALLOCPAGES\r
 240                 mov     bx,[EMSAvail];\r
 241                 int     EMS_INT\r
 242                 or      ah,ah\r
 243                 jnz     error2\r
 244                 mov     [EMSHandle],dx\r
 245                 jmp     End2\r
 246 #ifdef __BORLANDC__\r
 247         }\r
 248 #endif\r
 249         error2:\r
 250 #ifdef __BORLANDC__\r
 251         __asm {\r
 252 #endif\r
 253                 mov     err,ah\r
 254                 mov     errorflag,1\r
 255                 jmp     End2\r
 256 #ifdef __BORLANDC__\r
 257         }//end of assembly\r
 258 #endif\r
 259 End2:\r
 260 #ifdef __WATCOMC__\r
 261         }//end of assembly\r
 262 #endif\r
 263         if(errorflag==true)\r
 264         {\r
 265                 strcpy(str,"PML_StartupEMS: EMS error ");\r
 266                 MM_EMSerr(str, err);\r
 267                 printf("%s\n",str);\r
 268                 return(gvar->pm.emm.EMSPresent);\r
 269         }\r
 270         gvar->mmi.EMSmem = 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         gvar->pm.emm.EMSPresent = true;                 // We have EMS\r
 277         gvar->pm.emm.EMSPageFrame = EMSPageFrame;\r
 278         gvar->pm.emm.EMSAvail = EMSAvail;\r
 279         gvar->pm.emm.EMSVer = EMSVer;\r
 280         gvar->pm.emm.EMSHandle = EMSHandle;\r
 281         gvar->pm.emm.freeEMSpages = freeEMSpages;\r
 282         gvar->pm.emm.totalEMSpages = totalEMSpages;\r
 283 \r
 284         return(gvar->pm.emm.EMSPresent);\r
 285 }\r
 286 \r
 287 //\r
 288 //      PML_ShutdownEMS() - If EMS was used, deallocate it\r
 289 //\r
 290 void\r
 291 PML_ShutdownEMS(global_game_variables_t *gvar)\r
 292 {\r
 293         word EMSHandle;\r
 294         byte err=0, str[64];\r
 295 \r
 296         boolean errorflag=false;\r
 297         EMSHandle=gvar->pm.emm.EMSHandle;\r
 298 \r
 299         if (gvar->pm.emm.EMSPresent)\r
 300         {\r
 301                 __asm {\r
 302                         mov     ah,EMS_FREEPAGES\r
 303                         mov     dx,[EMSHandle]\r
 304                         int     EMS_INT\r
 305                         jc      errores\r
 306                         jmp     Endes\r
 307 #ifdef __BORLANDC__\r
 308                 }\r
 309 #endif\r
 310                         errores:\r
 311 #ifdef __BORLANDC__\r
 312                 __asm {\r
 313 #endif\r
 314                         mov     err,ah\r
 315                         mov     errorflag,1\r
 316                         jmp     Endes\r
 317 #ifdef __BORLANDC__\r
 318                 }\r
 319 #endif\r
 320                         Endes:\r
 321 #ifdef __WATCOMC__\r
 322                 }\r
 323 #endif\r
 324                 if(errorflag==true)\r
 325                 {\r
 326                         strcpy(str,"PML_ShutdownEMS: Error freeing EMS ");\r
 327                         MM_EMSerr(str, err);\r
 328                         printf("%s\n",str);\r
 329                         Quit ("PML_ShutdownEMS: Error freeing EMS\n");\r
 330                         //return;\r
 331                 }\r
 332         }\r
 333 }\r
 334 \r
 335 /////////////////////////////////////////////////////////////////////////////\r
 336 //\r
 337 //      XMS Management code\r
 338 //\r
 339 /////////////////////////////////////////////////////////////////////////////\r
 340 \r
 341 //\r
 342 //      PML_StartupXMS() - Starts up XMS for the Page Mgr's use\r
 343 //              Checks for presence of an XMS driver\r
 344 //              Makes sure that there's at least a page of XMS available\r
 345 //              Allocates any remaining XMS (rounded down to the nearest page size)\r
 346 //\r
 347 boolean\r
 348 PML_StartupXMS(global_game_variables_t *gvar)\r
 349 {\r
 350 //TODO: translate the _REG into working assembly\r
 351 //#define STARTUPXMSASM\r
 352         byte err;\r
 353         word XMSAvail, XMSHandle;//, XMSVer;\r
 354         boolean errorflag=false;\r
 355         word e=0;\r
 356         gvar->pm.xmm.XMSPresent = false;                                        // Assume failure\r
 357         XMSAvail = gvar->mmi.XMSmem = 0;\r
 358 \r
 359         __asm {\r
 360                 mov     ax,0x4300\r
 361                 int     XMS_INT                                         // Check for presence of XMS driver\r
 362                 cmp     al,0x80\r
 363                 jne     error1\r
 364                 mov     e,1\r
 365 \r
 366                 mov     ax,0x4310\r
 367                 int     XMS_INT                                                 // Get address of XMS driver\r
 368                 mov     [WORD PTR XMSDriver],bx\r
 369                 mov     [WORD PTR XMSDriver+2],es               // function pointer to XMS driver\r
 370 \r
 371                 mov     ah,XMS_VERSION\r
 372                 call    [DWORD PTR XMSDriver]                                           //; Get XMS Version Number\r
 373                 mov     [XMSVer],ax\r
 374                 mov     e,2\r
 375 \r
 376 #ifdef STARTUPXMSASM\r
 377                 mov     ah,XMS_QUERYFREE                        // Find out how much XMS is available\r
 378                 call    [DWORD PTR XMSDriver]\r
 379                 mov     XMSAvail,ax\r
 380                 or      ax,ax                           // AJR: bugfix 10/8/92\r
 381                 jz      error1\r
 382                 mov     e,3\r
 383 #endif\r
 384                 jmp     End1\r
 385 #ifdef __BORLANDC__\r
 386         }\r
 387 #endif\r
 388         error1:\r
 389 #ifdef __BORLANDC__\r
 390         __asm {\r
 391 #endif\r
 392                 mov     err,bl\r
 393                 mov     errorflag,1\r
 394                 jmp End1\r
 395 #ifdef __BORLANDC__\r
 396         }\r
 397 #endif\r
 398 End1:\r
 399 #ifdef __WATCOMC__\r
 400         }\r
 401 #endif\r
 402         if(errorflag==true) goto error;\r
 403 #ifndef STARTUPXMSASM\r
 404         XMS_CALL(XMS_QUERYFREE);                        // Find out how much XMS is available\r
 405         XMSAvail = _AX;\r
 406         if (!_AX)                               // AJR: bugfix 10/8/92\r
 407         {\r
 408                 errorflag = true;\r
 409                 err = _BL;\r
 410                 goto error;\r
 411         }\r
 412         e++;\r
 413 #endif\r
 414 \r
 415 #ifdef __DEBUG_PM__\r
 416         printf("XMSVer=%02X     ", XMSVer);\r
 417         printf("XMSAvail=%u\n", XMSAvail);\r
 418         getch();\r
 419 #endif\r
 420         XMSAvail &= ~(PMPageSizeKB - 1);        // Round off to nearest page size\r
 421         if (XMSAvail < (PMPageSizeKB * 2))      // Need at least 2 pages\r
 422         {\r
 423                 errorflag=true;\r
 424                 goto error;\r
 425         }\r
 426 #ifdef STARTUPXMSASM\r
 427         __asm {\r
 428                 mov     dx,XMSAvail\r
 429                 mov     ah,XMS_ALLOC                            // And do the allocation\r
 430                 call    [DWORD PTR XMSDriver]\r
 431                 mov     XMSHandle,dx\r
 432                 or      ax,ax                           // AJR: bugfix 10/8/92\r
 433                 jz      error2\r
 434                 mov     e,4\r
 435                 jmp     End2\r
 436 #ifdef __BORLANDC__\r
 437         }\r
 438 #endif\r
 439         error2:\r
 440 #ifdef __BORLANDC__\r
 441         __asm {\r
 442 #endif\r
 443                 mov     err,bl\r
 444                 mov     errorflag,1\r
 445                 jmp End2\r
 446 #ifdef __BORLANDC__\r
 447         }\r
 448 #endif\r
 449 End2:\r
 450 #ifdef __WATCOMC__\r
 451         }\r
 452 #endif\r
 453 #else\r
 454         _DX = XMSAvail;\r
 455         XMS_CALL(XMS_ALLOC);                            // And do the allocation\r
 456         XMSHandle = _DX;\r
 457         if (!_AX)                               // AJR: bugfix 10/8/92\r
 458         {\r
 459                 errorflag=true;\r
 460                 err = _BL;\r
 461                 goto error;\r
 462         }\r
 463         e++;\r
 464 #endif\r
 465 error:\r
 466         if(errorflag==false)\r
 467         {\r
 468                 gvar->mmi.XMSmem = (dword)(XMSAvail) * 1024;\r
 469                 gvar->pm.xmm.XMSAvail = XMSAvail;\r
 470                 gvar->pm.xmm.XMSHandle = XMSHandle;\r
 471                 //gvar->pm.xmm.XMSVer = XMSVer;\r
 472                 gvar->pm.xmm.XMSPresent = true;\r
 473 #ifdef __DEBUG_PM__\r
 474                 printf("        XMSmem=%lu      XMSAvail=%u\n", gvar->mmi.XMSmem, XMSAvail);\r
 475 #endif\r
 476         }\r
 477         else\r
 478         {\r
 479 #ifdef __DEBUG_PM__\r
 480                 //printf("XMSHandle\n");\r
 481                 //printf("      1=%u    2=%u    3=%u    4=%u\n", XMSHandle1, XMSHandle2, XMSHandle3, XMSHandle4);\r
 482                 //printf("      2=%u    ", XMSHandle);\r
 483                 //printf("      %u", gvar->pm.xmm.XMSHandle);\r
 484                 printf("        err=%02X        e=%u\n", err, e);\r
 485 #endif\r
 486         }\r
 487         return(gvar->pm.xmm.XMSPresent);\r
 488 }\r
 489 \r
 490 //\r
 491 //      PML_XMSCopy() - Copies a main/EMS page to or from XMS\r
 492 //              Will round an odd-length request up to the next even value\r
 493 //\r
 494 void\r
 495 PML_XMSCopy(boolean toxms,byte far *addr,word xmspage,word length, global_game_variables_t *gvar)\r
 496 {\r
 497         dword   xoffset;\r
 498         struct\r
 499         {\r
 500                 dword   length;\r
 501                 word            source_handle;\r
 502                 dword   source_offset;\r
 503                 word            target_handle;\r
 504                 dword   target_offset;\r
 505         } copy;\r
 506 \r
 507         if (!addr)\r
 508         {\r
 509                 Quit ("PML_XMSCopy: zero address\n");\r
 510         }\r
 511 \r
 512         xoffset = (dword)xmspage * PMPageSize;\r
 513 \r
 514         copy.length = (length + 1) & ~1;\r
 515         copy.source_handle = toxms? 0 : gvar->pm.xmm.XMSHandle;\r
 516         copy.source_offset = toxms? (long)addr : xoffset;\r
 517         copy.target_handle = toxms? gvar->pm.xmm.XMSHandle : 0;\r
 518         copy.target_offset = toxms? xoffset : (long)addr;\r
 519 \r
 520         __asm {\r
 521                 push si\r
 522         }\r
 523         _SI = (word)&copy;\r
 524         XMS_CALL(XMS_MOVE);\r
 525         __asm {\r
 526                 pop     si\r
 527         }\r
 528         if (!_AX)\r
 529         {\r
 530                 Quit ("PML_XMSCopy: Error on copy");\r
 531                 //return;\r
 532         }\r
 533 }\r
 534 \r
 535 #if 1\r
 536 #define PML_CopyToXMS(s,t,l,gvar)       PML_XMSCopy(true,(s),(t),(l),(gvar))\r
 537 #define PML_CopyFromXMS(t,s,l,gvar)     PML_XMSCopy(false,(t),(s),(l),(gvar))\r
 538 #else\r
 539 //\r
 540 //      PML_CopyToXMS() - Copies the specified number of bytes from the real mode\r
 541 //              segment address to the specified XMS page\r
 542 //\r
 543 void\r
 544 PML_CopyToXMS(byte far *source,int targetpage,word length,global_game_variables_t *gvar)\r
 545 {\r
 546         PML_XMSCopy(true,source,targetpage,length, global_game_variables_t *gvar);\r
 547 }\r
 548 \r
 549 //\r
 550 //      PML_CopyFromXMS() - Copies the specified number of bytes from an XMS\r
 551 //              page to the specified real mode address\r
 552 //\r
 553 void\r
 554 PML_CopyFromXMS(byte far *target,int sourcepage,word length, global_game_variables_t *gvar)\r
 555 {\r
 556         PML_XMSCopy(false,target,sourcepage,length, global_game_variables_t *gvar);\r
 557 }\r
 558 #endif\r
 559 \r
 560 //\r
 561 //      PML_ShutdownXMS()\r
 562 //\r
 563 void\r
 564 PML_ShutdownXMS(global_game_variables_t *gvar)\r
 565 {\r
 566         boolean errorflag=false;\r
 567         word XMSHandle = gvar->pm.xmm.XMSHandle;\r
 568         if (gvar->pm.xmm.XMSPresent)\r
 569         {\r
 570                 __asm {\r
 571                         mov     dx,[XMSHandle]\r
 572                         //XMS_CALL(XMS_FREE);\r
 573                         mov     ah,XMS_FREE\r
 574                         call    [DWORD PTR XMSDriver]\r
 575                         or      bl,bl\r
 576                         jz      errorxs\r
 577                         jmp     Endxs\r
 578 #ifdef __BORLANDC__\r
 579                 }\r
 580 #endif\r
 581                         errorxs:\r
 582 #ifdef __BORLANDC__\r
 583                 __asm {\r
 584 #endif\r
 585                         //mov   err,ah\r
 586                         mov     errorflag,1\r
 587                         jmp     Endxs\r
 588 #ifdef __BORLANDC__\r
 589                 }\r
 590 #endif\r
 591                         Endxs:\r
 592 #ifdef __WATCOMC__\r
 593                 }\r
 594 #endif\r
 595                 if(errorflag==true)\r
 596                 {\r
 597                         Quit ("PML_ShutdownXMS: Error freeing XMS");\r
 598                         //return;\r
 599                 }\r
 600         }\r
 601 }\r
 602 \r
 603 /////////////////////////////////////////////////////////////////////////////\r
 604 //\r
 605 //      Main memory code\r
 606 //\r
 607 /////////////////////////////////////////////////////////////////////////////\r
 608 \r
 609 //\r
 610 //      PM_SetMainMemPurge() - Sets the purge level for all allocated main memory\r
 611 //              blocks. This shouldn't be called directly - the PM_LockMainMem() and\r
 612 //              PM_UnlockMainMem() macros should be used instead.\r
 613 //\r
 614 void\r
 615 PM_SetMainMemPurge(int level, global_game_variables_t *gvar)\r
 616 {\r
 617         int     i;\r
 618 \r
 619         if(gvar->pm.mm.MainPresent)\r
 620         for (i = 0;i < PMMaxMainMem;i++)\r
 621         {\r
 622 #ifdef __DEBUG_PM__\r
 623 #ifdef __DEBUG_PM_MAIN__\r
 624                 printf("PM_SetMainMemPurge()    info of gvar->pm.mm.MainMemPages[i]\n");\r
 625                 printf("&       %Fp,    %Fp\n", &gvar->pm.mm.MainMemPages[i],   &(gvar->pm.mm.MainMemPages[i]));\r
 626 #endif\r
 627 #endif\r
 628                 if (gvar->pm.mm.MainMemPages[i])\r
 629                         MM_SetPurge(&(gvar->pm.mm.MainMemPages[i]),level, gvar);\r
 630         }\r
 631 \r
 632         else\r
 633         {\r
 634                 Quit ("MainPresent IS NULL\n");\r
 635         }\r
 636 }\r
 637 \r
 638 //\r
 639 //      PM_CheckMainMem() - If something besides the Page Mgr makes requests of\r
 640 //              the Memory Mgr, some of the Page Mgr's blocks may have been purged,\r
 641 //              so this function runs through the block list and checks to see if\r
 642 //              any of the blocks have been purged. If so, it marks the corresponding\r
 643 //              page as purged & unlocked, then goes through the block list and\r
 644 //              tries to reallocate any blocks that have been purged.\r
 645 //      This routine now calls PM_LockMainMem() to make sure that any allocation\r
 646 //              attempts made during the block reallocation sweep don't purge any\r
 647 //              of the other blocks. Because PM_LockMainMem() is called,\r
 648 //              PM_UnlockMainMem() needs to be called before any other part of the\r
 649 //              program makes allocation requests of the Memory Mgr.\r
 650 //\r
 651 void\r
 652 PM_CheckMainMem(global_game_variables_t *gvar)\r
 653 {\r
 654         boolean                 allocfailed;\r
 655         int                             i,n;\r
 656         memptr                  *p;\r
 657         PMBlockAttr             *used;\r
 658         PageListStruct  far *page;\r
 659 \r
 660         if (!gvar->pm.mm.MainPresent)\r
 661                 return;\r
 662 \r
 663         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 664         {\r
 665                 n = page->mainPage;\r
 666                 if (n != -1)                                            // Is the page using main memory?\r
 667                 {\r
 668                         if (!gvar->pm.mm.MainMemPages[n])                       // Yep, was the block purged?\r
 669                         {\r
 670                                 page->mainPage = -1;            // Yes, mark page as purged & unlocked\r
 671                                 page->locked = pml_Unlocked;\r
 672                         }\r
 673                 }\r
 674         }\r
 675 \r
 676         // Prevent allocation attempts from purging any of our other blocks\r
 677         PM_LockMainMem(gvar);\r
 678         allocfailed = false;\r
 679         for (i = 0,p = gvar->pm.mm.MainMemPages,used = gvar->pm.mm.MainMemUsed; i < PMMaxMainMem;i++,p++,used++)\r
 680         {\r
 681                 if (!*p)                                                        // If the page got purged\r
 682                 {\r
 683                         if (*used & pmba_Allocated)             // If it was allocated\r
 684                         {\r
 685                                 *used &= ~pmba_Allocated;       // Mark as unallocated\r
 686                                 gvar->pm.mm.MainPagesAvail--;                   // and decrease available count\r
 687                         }\r
 688 \r
 689                         if (*used & pmba_Used)                  // If it was used\r
 690                         {\r
 691                                 *used &= ~pmba_Used;            // Mark as unused\r
 692                                 gvar->pm.MainPagesUsed--;                       // and decrease used count\r
 693                         }\r
 694 \r
 695                         if (!allocfailed)\r
 696                         {\r
 697                                 MM_BombOnError(false, gvar);\r
 698                                 MM_GetPtr(p,PMPageSize, gvar);          // Try to reallocate\r
 699                                 if (gvar->mm.mmerror)                                   // If it failed,\r
 700                                         allocfailed = true;                     //  don't try any more allocations\r
 701                                 else                                                    // If it worked,\r
 702                                 {\r
 703                                         *used |= pmba_Allocated;        // Mark as allocated\r
 704                                         gvar->pm.mm.MainPagesAvail++;                   // and increase available count\r
 705                                 }\r
 706                                 MM_BombOnError(true, gvar);\r
 707                         }\r
 708                 }\r
 709         }\r
 710         if (gvar->mm.mmerror)\r
 711                 gvar->mm.mmerror = false;\r
 712 }\r
 713 \r
 714 //\r
 715 //      PML_StartupMainMem() - Allocates as much main memory as is possible for\r
 716 //              the Page Mgr. The memory is allocated as non-purgeable, so if it's\r
 717 //              necessary to make requests of the Memory Mgr, PM_UnlockMainMem()\r
 718 //              needs to be called.\r
 719 //\r
 720 void\r
 721 PML_StartupMainMem(global_game_variables_t *gvar)\r
 722 {\r
 723         int             i;//,n;\r
 724         memptr  *p;\r
 725 \r
 726         gvar->pm.mm.MainPagesAvail = 0;\r
 727         gvar->pm.mm.MainPresent = false;\r
 728         MM_BombOnError(false, gvar);\r
 729         for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)\r
 730         {\r
 731                 MM_GetPtr(p,PMPageSize, gvar);\r
 732                 if (gvar->mm.mmerror)\r
 733                         break;\r
 734 \r
 735                 gvar->pm.mm.MainPagesAvail++;\r
 736                 gvar->pm.mm.MainMemUsed[i] = pmba_Allocated;\r
 737         }\r
 738         MM_BombOnError(true, gvar);\r
 739         if (gvar->mm.mmerror)\r
 740                 gvar->mm.mmerror = false;\r
 741         if (gvar->pm.mm.MainPagesAvail < PMMinMainMem)\r
 742         {\r
 743                 Quit ("PM_SetupMainMem: Not enough main memory");\r
 744                 //return;\r
 745         }\r
 746         gvar->pm.mm.MainPresent = true;\r
 747 }\r
 748 \r
 749 //\r
 750 //      PML_ShutdownMainMem() - Frees all of the main memory blocks used by the\r
 751 //              Page Mgr.\r
 752 //\r
 753 void\r
 754 PML_ShutdownMainMem(global_game_variables_t *gvar)\r
 755 {\r
 756         int             i;\r
 757         memptr  *p;\r
 758 \r
 759         // DEBUG - mark pages as unallocated & decrease page count as appropriate\r
 760         for (i = 0,p = gvar->pm.mm.MainMemPages;i < PMMaxMainMem;i++,p++)\r
 761                 if (*p)\r
 762                         MM_FreePtr(p, gvar);\r
 763 }\r
 764 \r
 765 /////////////////////////////////////////////////////////////////////////////\r
 766 //\r
 767 //      File management code\r
 768 //\r
 769 /////////////////////////////////////////////////////////////////////////////\r
 770 \r
 771 //\r
 772 //      PML_ReadFromFile() - Reads some data in from the page file\r
 773 //\r
 774 void\r
 775 PML_ReadFromFile(byte far *buf,long offset,word length, global_game_variables_t *gvar)\r
 776 {\r
 777         if (!buf)\r
 778         {\r
 779                 Quit ("PML_ReadFromFile: Null pointer");\r
 780                 //return;\r
 781         }\r
 782         if (!offset)\r
 783         {\r
 784                 Quit ("PML_ReadFromFile: Zero offset");\r
 785                 //return;\r
 786         }\r
 787         if (lseek(gvar->pm.fi.PageFile,offset,SEEK_SET) != offset)\r
 788         {\r
 789                 Quit ("PML_ReadFromFile: Seek failed");\r
 790                 //return;\r
 791         }\r
 792         if (!CA_FarRead(gvar->pm.fi.PageFile,buf,length, gvar))\r
 793         {\r
 794                 Quit ("PML_ReadFromFile: Read failed");\r
 795                 //return;\r
 796         }\r
 797 }\r
 798 \r
 799 //\r
 800 //      PML_OpenPageFile() - Opens the page file and sets up the page info\r
 801 //\r
 802 void\r
 803 PML_OpenPageFile(global_game_variables_t *gvar)\r
 804 {\r
 805         int                             i;\r
 806         long                    size;\r
 807         void                    _seg *buf;\r
 808         dword           far *offsetptr;\r
 809         word                    far *lengthptr;\r
 810         PageListStruct  far *page;\r
 811 \r
 812         gvar->pm.fi.PageFile = open(gvar->pm.fi.PageFileName,O_RDONLY + O_BINARY);\r
 813         if (gvar->pm.fi.PageFile == -1)\r
 814         {\r
 815                 Quit ("PML_OpenPageFile: Unable to open page file");\r
 816                 //return;\r
 817         }\r
 818 \r
 819         // Read in header variables\r
 820         read(gvar->pm.fi.PageFile,&gvar->pm.fi.ChunksInFile,sizeof(gvar->pm.fi.ChunksInFile));\r
 821         read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSpriteStart,sizeof(gvar->pm.fi.PMSpriteStart));\r
 822         read(gvar->pm.fi.PageFile,&gvar->pm.fi.PMSoundStart,sizeof(gvar->pm.fi.PMSoundStart));\r
 823 \r
 824         // Allocate and clear the page list\r
 825         gvar->pm.PMNumBlocks = gvar->pm.fi.ChunksInFile;\r
 826         MM_GetPtr((memptr *)&gvar->pm.PMSegPages, sizeof(PageListStruct) * (gvar->pm.PMNumBlocks), gvar);\r
 827         MM_SetLock((memptr *)&gvar->pm.PMSegPages,true, gvar);\r
 828         gvar->pm.PMPages = (PageListStruct far *)gvar->pm.PMSegPages;\r
 829         _fmemset(gvar->pm.PMPages,0,sizeof(PageListStruct) * gvar->pm.PMNumBlocks);\r
 830 \r
 831         // Read in the chunk offsets\r
 832         size = sizeof(dword) * gvar->pm.fi.ChunksInFile;\r
 833         MM_GetPtr((memptr *)&buf, size, gvar);\r
 834         if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))\r
 835         {\r
 836                 Quit ("PML_OpenPageFile: Offset read failed");\r
 837                 //return;\r
 838         }\r
 839         offsetptr = (dword far *)buf;\r
 840         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 841                 page->offset = *offsetptr++;\r
 842         MM_FreePtr((memptr *)&buf, gvar);\r
 843 \r
 844         // Read in the chunk lengths\r
 845         size = sizeof(word) * gvar->pm.fi.ChunksInFile;\r
 846         MM_GetPtr(&buf,size, gvar);\r
 847         if (!CA_FarRead(gvar->pm.fi.PageFile,(byte far *)buf,size, gvar))\r
 848         {\r
 849                 Quit ("PML_OpenPageFile: Length read failed");\r
 850                 //return;\r
 851         }\r
 852         lengthptr = (word far *)buf;\r
 853         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 854                 page->length = *lengthptr++;\r
 855         MM_FreePtr((memptr *)&buf, gvar);\r
 856 }\r
 857 \r
 858 //\r
 859 //  PML_ClosePageFile() - Closes the page file\r
 860 //\r
 861 void\r
 862 PML_ClosePageFile(global_game_variables_t *gvar)\r
 863 {\r
 864         if (gvar->pm.fi.PageFile != -1)\r
 865                 close(gvar->pm.fi.PageFile);\r
 866         if (gvar->pm.PMSegPages)\r
 867         {\r
 868                 MM_SetLock((memptr *)&gvar->pm.PMSegPages,false, gvar);\r
 869                 MM_FreePtr((void _seg *)&gvar->pm.PMSegPages, gvar);\r
 870         }\r
 871 }\r
 872 \r
 873 /////////////////////////////////////////////////////////////////////////////\r
 874 //\r
 875 //      Allocation, etc., code\r
 876 //\r
 877 /////////////////////////////////////////////////////////////////////////////\r
 878 \r
 879 //\r
 880 //      PML_GetEMSAddress()\r
 881 //\r
 882 //              Page is in EMS, so figure out which EMS physical page should be used\r
 883 //              to map our page in. If normal page, use EMS physical page 3, else\r
 884 //              use the physical page specified by the lock type\r
 885 //\r
 886 #ifndef __DEBUG_2__\r
 887 #pragma argsused        // DEBUG - remove lock parameter\r
 888 memptr\r
 889 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)\r
 890 {\r
 891         int             i,emspage;\r
 892         word    emsoff,emsbase,offset;\r
 893 \r
 894         emsoff = page & (PMEMSSubPage - 1);\r
 895         emsbase = page - emsoff;\r
 896 \r
 897         emspage = -1;\r
 898         // See if this page is already mapped in\r
 899         for (i = 0;i < EMSFrameCount;i++)\r
 900         {\r
 901                 if (gvar->pm.emm.EMSList[i].baseEMSPage == emsbase)\r
 902                 {\r
 903                         emspage = i;    // Yep - don't do a redundant remapping\r
 904                         break;\r
 905                 }\r
 906         }\r
 907 \r
 908         // If page isn't already mapped in, find LRU EMS frame, and use it\r
 909         if (emspage == -1)\r
 910         {\r
 911                 dword last = LONG_MAX;\r
 912                 for (i = 0;i < EMSFrameCount;i++)\r
 913                 {\r
 914                         if (gvar->pm.emm.EMSList[i].lastHit < last)\r
 915                         {\r
 916                                 emspage = i;\r
 917                                 last = gvar->pm.emm.EMSList[i].lastHit;\r
 918                         }\r
 919                 }\r
 920 \r
 921                 gvar->pm.emm.EMSList[emspage].baseEMSPage = emsbase;\r
 922                 PML_MapEMS(page / PMEMSSubPage,emspage, gvar);\r
 923         }\r
 924 \r
 925         if (emspage == -1)\r
 926                 Quit ("PML_GetEMSAddress: EMS find failed");\r
 927 \r
 928         gvar->pm.emm.EMSList[emspage].lastHit = gvar->pm.PMFrameCount;\r
 929         offset = emspage * EMSPageSizeSeg;\r
 930         offset += emsoff * PMPageSizeSeg;\r
 931         return((memptr)(gvar->pm.emm.EMSPageFrame + offset));\r
 932 }\r
 933 #else\r
 934 memptr\r
 935 PML_GetEMSAddress(int page,PMLockType lock, global_game_variables_t *gvar)\r
 936 {\r
 937         word    emspage;\r
 938 \r
 939         emspage = (lock < pml_EMSLock)? 3 : (lock - pml_EMSLock);\r
 940 \r
 941         PML_MapEMS(page / PMEMSSubPage,emspage);\r
 942 \r
 943         return((memptr)(EMSPageFrame + (emspage * EMSPageSizeSeg)\r
 944                         + ((page & (PMEMSSubPage - 1)) * PMPageSizeSeg)));\r
 945 }\r
 946 #endif\r
 947 \r
 948 //\r
 949 //      PM_GetPageAddress() - Returns the address of a given page\r
 950 //              Maps in EMS if necessary\r
 951 //              Returns nil if block isn't cached into Main Memory or EMS\r
 952 //\r
 953 //\r
 954 memptr\r
 955 PM_GetPageAddress(int pagenum, global_game_variables_t *gvar)\r
 956 {\r
 957         PageListStruct  far *page;\r
 958 \r
 959         page = &gvar->pm.PMPages[pagenum];\r
 960         if (page->mainPage != -1)\r
 961                 return(gvar->pm.mm.MainMemPages[page->mainPage]);\r
 962         else if (page->emsPage != -1)\r
 963                 return(PML_GetEMSAddress(page->emsPage,page->locked, gvar));\r
 964         else\r
 965                 return(nil);\r
 966 }\r
 967 \r
 968 //\r
 969 //      PML_GiveLRUPage() - Returns the page # of the least recently used\r
 970 //              present & unlocked main/EMS page (or main page if mainonly is true)\r
 971 //\r
 972 int\r
 973 PML_GiveLRUPage(boolean mainonly, global_game_variables_t *gvar)\r
 974 {\r
 975         int                             i,lru;\r
 976         long                    last;\r
 977         PageListStruct  far *page;\r
 978 \r
 979         for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
 980         {\r
 981                 if\r
 982                 (\r
 983                         (page->lastHit < last)\r
 984                 &&      ((page->emsPage != -1) || (page->mainPage != -1))\r
 985                 &&      (page->locked == pml_Unlocked)\r
 986                 &&      (!(mainonly && (page->mainPage == -1)))\r
 987                 )\r
 988                 {\r
 989                         last = page->lastHit;\r
 990                         lru = i;\r
 991                 }\r
 992         }\r
 993 \r
 994         if (lru == -1)\r
 995                 Quit ("PML_GiveLRUPage: LRU Search failed");\r
 996         return(lru);\r
 997 }\r
 998 \r
 999 //\r
1000 //      PML_GiveLRUXMSPage() - Returns the page # of the least recently used\r
1001 //              (and present) XMS page.\r
1002 //      This routine won't return the XMS page protected (by XMSProtectPage)\r
1003 //\r
1004 int\r
1005 PML_GiveLRUXMSPage(global_game_variables_t *gvar)\r
1006 {\r
1007         int                             i,lru;\r
1008         long                    last;\r
1009         PageListStruct  far *page;\r
1010 \r
1011         for (i = 0,page = gvar->pm.PMPages,lru = -1,last = LONG_MAX;i < gvar->pm.fi.ChunksInFile;i++,page++)\r
1012         {\r
1013                 if\r
1014                 (\r
1015                         (page->xmsPage != -1)\r
1016                 &&      (page->lastHit < last)\r
1017                 &&      (i != gvar->pm.xmm.XMSProtectPage)\r
1018                 )\r
1019                 {\r
1020                         last = page->lastHit;\r
1021                         lru = i;\r
1022                 }\r
1023         }\r
1024         return(lru);\r
1025 }\r
1026 \r
1027 //\r
1028 //      PML_PutPageInXMS() - If page isn't in XMS, find LRU XMS page and replace\r
1029 //              it with the main/EMS page\r
1030 //\r
1031 void\r
1032 PML_PutPageInXMS(int pagenum, global_game_variables_t *gvar)\r
1033 {\r
1034         int                             usexms;\r
1035         PageListStruct  far *page;\r
1036 \r
1037         if (!gvar->pm.xmm.XMSPresent)\r
1038                 return;\r
1039 \r
1040         page = &gvar->pm.PMPages[pagenum];\r
1041         if (page->xmsPage != -1)\r
1042                 return;                                 // Already in XMS\r
1043 \r
1044         if (gvar->pm.XMSPagesUsed < gvar->pm.xmm.XMSPagesAvail)\r
1045                 page->xmsPage = gvar->pm.XMSPagesUsed++;\r
1046         else\r
1047         {\r
1048                 usexms = PML_GiveLRUXMSPage(gvar);\r
1049                 if (usexms == -1)\r
1050                         Quit ("PML_PutPageInXMS: No XMS LRU");\r
1051                 page->xmsPage = gvar->pm.PMPages[usexms].xmsPage;\r
1052                 gvar->pm.PMPages[usexms].xmsPage = -1;\r
1053         }\r
1054         PML_CopyToXMS(PM_GetPageAddress(pagenum, gvar),page->xmsPage,page->length, gvar);\r
1055 }\r
1056 \r
1057 //\r
1058 //      PML_TransferPageSpace() - A page is being replaced, so give the new page\r
1059 //              the old one's address space. Returns the address of the new page.\r
1060 //\r
1061 memptr\r
1062 PML_TransferPageSpace(int orig,int new, global_game_variables_t *gvar)\r
1063 {\r
1064         memptr                  addr;\r
1065         PageListStruct  far *origpage,far *newpage;\r
1066 \r
1067         if (orig == new)\r
1068                 Quit ("PML_TransferPageSpace: Identity replacement");\r
1069 \r
1070         origpage = &gvar->pm.PMPages[orig];\r
1071         newpage = &gvar->pm.PMPages[new];\r
1072 \r
1073         if (origpage->locked != pml_Unlocked)\r
1074                 Quit ("PML_TransferPageSpace: Killing locked page");\r
1075 \r
1076         if ((origpage->emsPage == -1) && (origpage->mainPage == -1))\r
1077                 Quit ("PML_TransferPageSpace: Reusing non-existent page");\r
1078 \r
1079         // Copy page that's about to be purged into XMS\r
1080         PML_PutPageInXMS(orig, gvar);\r
1081 \r
1082         // Get the address, and force EMS into a physical page if necessary\r
1083         addr = PM_GetPageAddress(orig, gvar);\r
1084 \r
1085         // Steal the address\r
1086         newpage->emsPage = origpage->emsPage;\r
1087         newpage->mainPage = origpage->mainPage;\r
1088 \r
1089         // Mark replaced page as purged\r
1090         origpage->mainPage = origpage->emsPage = -1;\r
1091 \r
1092         if (!addr)\r
1093                 Quit ("PML_TransferPageSpace: Zero replacement");\r
1094 \r
1095         return(addr);\r
1096 }\r
1097 \r
1098 //\r
1099 //      PML_GetAPageBuffer() - A page buffer is needed. Either get it from the\r
1100 //              main/EMS free pool, or use PML_GiveLRUPage() to find which page to\r
1101 //              steal the buffer from. Returns a far pointer to the page buffer, and\r
1102 //              sets the fields inside the given page structure appropriately.\r
1103 //              If mainonly is true, free EMS will be ignored, and only main pages\r
1104 //              will be looked at by PML_GiveLRUPage().\r
1105 //\r
1106 byte far *\r
1107 PML_GetAPageBuffer(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
1108 {\r
1109         byte                    far *addr = nil;\r
1110         int                             i,n;\r
1111         PMBlockAttr             *used;\r
1112         PageListStruct  far *page;\r
1113 \r
1114         page = &gvar->pm.PMPages[pagenum];\r
1115         if ((gvar->pm.EMSPagesUsed < gvar->pm.emm.EMSPagesAvail) && !mainonly)\r
1116         {\r
1117                 // There's remaining EMS - use it\r
1118                 page->emsPage = gvar->pm.EMSPagesUsed++;\r
1119                 addr = PML_GetEMSAddress(page->emsPage,page->locked, gvar);\r
1120         }\r
1121         else if (gvar->pm.MainPagesUsed < gvar->pm.mm.MainPagesAvail)\r
1122         {\r
1123                 // There's remaining main memory - use it\r
1124                 for (i = 0,n = -1,used = gvar->pm.mm.MainMemUsed;i < PMMaxMainMem;i++,used++)\r
1125                 {\r
1126                         if ((*used & pmba_Allocated) && !(*used & pmba_Used))\r
1127                         {\r
1128                                 n = i;\r
1129                                 *used |= pmba_Used;\r
1130                                 break;\r
1131                         }\r
1132                 }\r
1133                 if (n == -1)\r
1134                         Quit ("PML_GetPageBuffer: MainPagesAvail lied");\r
1135                 addr = gvar->pm.mm.MainMemPages[n];\r
1136                 if (!addr)\r
1137                         Quit ("PML_GetPageBuffer: Purged main block");\r
1138                 page->mainPage = n;\r
1139                 gvar->pm.MainPagesUsed++;\r
1140         }\r
1141         else\r
1142                 addr = PML_TransferPageSpace(PML_GiveLRUPage(mainonly, gvar),pagenum, gvar);\r
1143 \r
1144         if (!addr)\r
1145                 Quit ("PML_GetPageBuffer: Search failed");\r
1146         return(addr);\r
1147 }\r
1148 \r
1149 //\r
1150 //      PML_GetPageFromXMS() - If page is in XMS, find LRU main/EMS page and\r
1151 //              replace it with the page from XMS. If mainonly is true, will only\r
1152 //              search for LRU main page.\r
1153 //      XMSProtectPage is set to the page to be retrieved from XMS, so that if\r
1154 //              the page from which we're stealing the main/EMS from isn't in XMS,\r
1155 //              it won't copy over the page that we're trying to get from XMS.\r
1156 //              (pages that are being purged are copied into XMS, if possible)\r
1157 //\r
1158 memptr\r
1159 PML_GetPageFromXMS(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
1160 {\r
1161         byte                    far *checkaddr;\r
1162         memptr                  addr = nil;\r
1163         PageListStruct  far *page;\r
1164 \r
1165         page = &gvar->pm.PMPages[pagenum];\r
1166         if (gvar->pm.xmm.XMSPresent && (page->xmsPage != -1))\r
1167         {\r
1168                 gvar->pm.xmm.XMSProtectPage = pagenum;\r
1169                 checkaddr = PML_GetAPageBuffer(pagenum,mainonly, gvar);\r
1170                 if (FP_OFF(checkaddr))\r
1171                         Quit ("PML_GetPageFromXMS: Non segment pointer");\r
1172                 addr = (memptr)FP_SEG(checkaddr);\r
1173                 PML_CopyFromXMS(addr,page->xmsPage,page->length, gvar);\r
1174                 gvar->pm.xmm.XMSProtectPage = -1;\r
1175         }\r
1176 \r
1177         return(addr);\r
1178 }\r
1179 \r
1180 //\r
1181 //      PML_LoadPage() - A page is not in main/EMS memory, and it's not in XMS.\r
1182 //              Load it into either main or EMS. If mainonly is true, the page will\r
1183 //              only be loaded into main.\r
1184 //\r
1185 void\r
1186 PML_LoadPage(int pagenum,boolean mainonly, global_game_variables_t *gvar)\r
1187 {\r
1188         byte                    far *addr;\r
1189         PageListStruct  far *page;\r
1190 \r
1191         addr = PML_GetAPageBuffer(pagenum,mainonly, gvar);\r
1192         page = &gvar->pm.PMPages[pagenum];\r
1193         PML_ReadFromFile(addr,page->offset,page->length, gvar);\r
1194 }\r
1195 \r
1196 //\r
1197 //      PM_GetPage() - Returns the address of the page, loading it if necessary\r
1198 //              First, check if in Main Memory or EMS\r
1199 //              Then, check XMS\r
1200 //              If not in XMS, load into Main Memory or EMS\r
1201 //\r
1202 #pragma warn -pia\r
1203 memptr\r
1204 PM_GetPage(int pagenum, global_game_variables_t *gvar)\r
1205 {\r
1206         memptr  result;\r
1207 \r
1208         if (pagenum >= gvar->pm.fi.ChunksInFile)\r
1209                 Quit ("PM_GetPage: Invalid page request");\r
1210 \r
1211 //#ifdef __DEBUG_2__    // for debugging\r
1212         __asm {\r
1213                 mov     dx,STATUS_REGISTER_1\r
1214                 in      al,dx\r
1215                 mov     dx,ATR_INDEX\r
1216                 mov     al,ATR_OVERSCAN\r
1217                 out     dx,al\r
1218                 mov     al,10   // bright green\r
1219                 out     dx,al\r
1220         }\r
1221 //#endif\r
1222 \r
1223         if (!(result = PM_GetPageAddress(pagenum, gvar)))\r
1224         {\r
1225                 boolean mainonly = (pagenum >= gvar->pm.fi.PMSoundStart);\r
1226 if (!gvar->pm.PMPages[pagenum].offset)  // JDC: sparse page\r
1227         Quit ("Tried to load a sparse page!");\r
1228                 if (!(result = PML_GetPageFromXMS(pagenum,mainonly, gvar)))\r
1229                 {\r
1230                         if (gvar->pm.PMPages[pagenum].lastHit ==  gvar->pm.PMFrameCount)\r
1231                                 gvar->pm.PMThrashing++;\r
1232 \r
1233                         PML_LoadPage(pagenum,mainonly, gvar);\r
1234                         result = PM_GetPageAddress(pagenum, gvar);\r
1235                 }\r
1236         }\r
1237         gvar->pm.PMPages[pagenum].lastHit =  gvar->pm.PMFrameCount;\r
1238 \r
1239 //#ifdef __DEBUG_2__    // for debugging\r
1240         __asm{\r
1241                 mov     dx,STATUS_REGISTER_1\r
1242                 in      al,dx\r
1243                 mov     dx,ATR_INDEX\r
1244                 mov     al,ATR_OVERSCAN\r
1245                 out     dx,al\r
1246                 mov     al,3    // blue\r
1247                 out     dx,al\r
1248                 mov     al,0x20 // normal\r
1249                 out     dx,al\r
1250         }\r
1251 //#endif\r
1252 \r
1253         return(result);\r
1254 }\r
1255 #pragma warn +pia\r
1256 \r
1257 //\r
1258 //      PM_SetPageLock() - Sets the lock type on a given page\r
1259 //              pml_Unlocked: Normal, page can be purged\r
1260 //              pml_Locked: Cannot be purged\r
1261 //              pml_EMS?: Same as pml_Locked, but if in EMS, use the physical page\r
1262 //                                      specified when returning the address. For sound stuff.\r
1263 //\r
1264 void\r
1265 PM_SetPageLock(int pagenum,PMLockType lock, global_game_variables_t *gvar)\r
1266 {\r
1267         if (pagenum < gvar->pm.fi.PMSoundStart)\r
1268                 Quit ("PM_SetPageLock: Locking/unlocking non-sound page");\r
1269 \r
1270         gvar->pm.PMPages[pagenum].locked = lock;\r
1271 }\r
1272 \r
1273 //\r
1274 //      PM_Preload() - Loads as many pages as possible into all types of memory.\r
1275 //              Calls the update function after each load, indicating the current\r
1276 //              page, and the total pages that need to be loaded (for thermometer).\r
1277 //\r
1278 void\r
1279 PM_Preload(boolean (*update)(word current,word total), global_game_variables_t *gvar)\r
1280 {\r
1281         int                             i,//j,\r
1282                                         page,oogypage;\r
1283         word                    current,total,\r
1284                                         //totalnonxms,totalxms,\r
1285                                         mainfree,maintotal,\r
1286                                         //emstotal,emsfree,\r
1287                                         xmsfree,xmstotal;\r
1288         memptr                  addr;\r
1289         PageListStruct  __far *p;\r
1290 \r
1291         mainfree = (gvar->pm.mm.MainPagesAvail - gvar->pm.MainPagesUsed) + (gvar->pm.emm.EMSPagesAvail - gvar->pm.EMSPagesUsed);\r
1292         xmsfree = (gvar->pm.xmm.XMSPagesAvail - gvar->pm.XMSPagesUsed);\r
1293 \r
1294         xmstotal = maintotal = 0;\r
1295 \r
1296         for (i = 0;i < gvar->pm.fi.ChunksInFile;i++)\r
1297         {\r
1298                 if (!gvar->pm.PMPages[i].offset)\r
1299                         continue;                       // sparse\r
1300 \r
1301                 if ( gvar->pm.PMPages[i].emsPage != -1 || gvar->pm.PMPages[i].mainPage != -1 )\r
1302                         continue;                       // already in main mem\r
1303 \r
1304                 if ( mainfree )\r
1305                 {\r
1306                         maintotal++;\r
1307                         mainfree--;\r
1308                 }\r
1309                 else if ( xmsfree && (gvar->pm.PMPages[i].xmsPage == -1) )\r
1310                 {\r
1311                         xmstotal++;\r
1312                         xmsfree--;\r
1313                 }\r
1314         }\r
1315 \r
1316 \r
1317         total = maintotal + xmstotal;\r
1318 \r
1319         if (!total)\r
1320                 return;\r
1321 \r
1322         page = 0;\r
1323         current = 0;\r
1324 \r
1325 //\r
1326 // cache main/ems blocks\r
1327 //\r
1328         while (maintotal)\r
1329         {\r
1330                 while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].mainPage != -1\r
1331                         ||      gvar->pm.PMPages[page].emsPage != -1 )\r
1332                         page++;\r
1333 \r
1334                 if (page >= gvar->pm.fi.ChunksInFile)\r
1335                         Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");\r
1336 \r
1337                 PM_GetPage(page, gvar);\r
1338 \r
1339                 page++;\r
1340                 current++;\r
1341                 maintotal--;\r
1342                 update(current,total);\r
1343         }\r
1344 \r
1345 //\r
1346 // load stuff to XMS\r
1347 //\r
1348         if (xmstotal)\r
1349         {\r
1350                 for (oogypage = 0 ; gvar->pm.PMPages[oogypage].mainPage == -1 ; oogypage++)\r
1351                 ;\r
1352                 addr = PM_GetPage(oogypage, gvar);\r
1353                 if (!addr)\r
1354                         Quit ("PM_Preload: XMS buffer failed");\r
1355 \r
1356                 while (xmstotal)\r
1357                 {\r
1358                         while ( !gvar->pm.PMPages[page].offset || gvar->pm.PMPages[page].xmsPage != -1 )\r
1359                                 page++;\r
1360 \r
1361                         if (page >= gvar->pm.fi.ChunksInFile)\r
1362                                 Quit ("PM_Preload: Pages>=gvar->pm.fi.ChunksInFile");\r
1363 \r
1364                         p = &gvar->pm.PMPages[page];\r
1365 \r
1366                         p->xmsPage = gvar->pm.XMSPagesUsed++;\r
1367                         if (gvar->pm.XMSPagesUsed > gvar->pm.xmm.XMSPagesAvail)\r
1368                                 Quit ("PM_Preload: Exceeded XMS pages");\r
1369                         if (p->length > PMPageSize)\r
1370                                 Quit ("PM_Preload: Page too long");\r
1371 \r
1372                         PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);\r
1373                         PML_CopyToXMS((byte far *)addr,p->xmsPage,p->length, gvar);\r
1374 \r
1375                         page++;\r
1376                         current++;\r
1377                         xmstotal--;\r
1378                         update(current,total);\r
1379                 }\r
1380 \r
1381                 p = &gvar->pm.PMPages[oogypage];\r
1382                 PML_ReadFromFile((byte far *)addr,p->offset,p->length, gvar);\r
1383         }\r
1384 \r
1385         update(total,total);\r
1386 }\r
1387 \r
1388 /////////////////////////////////////////////////////////////////////////////\r
1389 //\r
1390 //      General code\r
1391 //\r
1392 /////////////////////////////////////////////////////////////////////////////\r
1393 \r
1394 //\r
1395 //      PM_NextFrame() - Increments the frame counter and adjusts the thrash\r
1396 //              avoidence variables\r
1397 //\r
1398 //              If currently in panic mode (to avoid thrashing), check to see if the\r
1399 //                      appropriate number of frames have passed since the last time that\r
1400 //                      we would have thrashed. If so, take us out of panic mode.\r
1401 //\r
1402 //\r
1403 void\r
1404 PM_NextFrame(global_game_variables_t *gvar)\r
1405 {\r
1406         int     i;\r
1407 \r
1408         // Frame count overrun - kill the LRU hit entries & reset frame count\r
1409         if (++gvar->pm.PMFrameCount >= LONG_MAX - 4)\r
1410         {\r
1411                 for (i = 0;i < gvar->pm.PMNumBlocks;i++)\r
1412                         gvar->pm.PMPages[i].lastHit = 0;\r
1413                 gvar->pm.PMFrameCount = 0;\r
1414         }\r
1415 \r
1416 //#if 0\r
1417         for (i = 0;i < gvar->pm.fi.PMSoundStart;i++)\r
1418         {\r
1419                 if (gvar->pm.PMPages[i].locked)\r
1420                 {\r
1421                         char buf[40];\r
1422                         sprintf(buf,"PM_NextFrame: Page %d is locked",i);\r
1423                         Quit (buf);\r
1424                 }\r
1425         }\r
1426 //#endif\r
1427 \r
1428         if (gvar->pm.PMPanicMode)\r
1429         {\r
1430                 // DEBUG - set border color\r
1431                 if ((!gvar->pm.PMThrashing) && (!--gvar->pm.PMPanicMode))\r
1432                 {\r
1433                         // DEBUG - reset border color\r
1434                 }\r
1435         }\r
1436         if (gvar->pm.PMThrashing >= PMThrashThreshold)\r
1437                 gvar->pm.PMPanicMode = PMUnThrashThreshold;\r
1438         gvar->pm.PMThrashing = false;\r
1439 }\r
1440 \r
1441 //\r
1442 //      PM_Reset() - Sets up caching structures\r
1443 //\r
1444 void\r
1445 PM_Reset(global_game_variables_t *gvar)\r
1446 {\r
1447         int                             i;\r
1448         PageListStruct  far *page;\r
1449 \r
1450         gvar->pm.xmm.XMSPagesAvail = gvar->pm.xmm.XMSAvail / PMPageSizeKB;\r
1451 \r
1452         gvar->pm.emm.EMSPagesAvail = gvar->pm.emm.EMSAvail * (EMSPageSizeKB / PMPageSizeKB);\r
1453         gvar->pm.emm.EMSPhysicalPage = 0;\r
1454 \r
1455         gvar->pm.MainPagesUsed = gvar->pm.EMSPagesUsed = gvar->pm.XMSPagesUsed = 0;\r
1456 \r
1457         gvar->pm.PMPanicMode = false;\r
1458 \r
1459         gvar->pm.fi.PageFile = -1;\r
1460         gvar->pm.xmm.XMSProtectPage = -1;\r
1461 \r
1462         // Initialize page list\r
1463         for (i = 0,page = gvar->pm.PMPages;i < gvar->pm.PMNumBlocks;i++,page++)\r
1464         {\r
1465                 page->mainPage = -1;\r
1466                 page->emsPage = -1;\r
1467                 page->xmsPage = -1;\r
1468                 page->locked = false;\r
1469         }\r
1470 }\r
1471 \r
1472 //\r
1473 //      PM_Startup() - Start up the Page Mgr\r
1474 //\r
1475 void\r
1476 PM_Startup(global_game_variables_t *gvar)\r
1477 {\r
1478         boolean nomain,noems,noxms;\r
1479         int             i;\r
1480 \r
1481         if (gvar->pm.PMStarted)\r
1482                 return;\r
1483 \r
1484         //0000+=+=strcpy(&(gvar->pm.fi.PageFileName), "VSWAP.");\r
1485 \r
1486         nomain = noems = noxms = false;\r
1487         for (i = 1;i < _argc;i++)\r
1488         {\r
1489                 switch (US_CheckParm(_argv[i],ParmStrings))\r
1490                 {\r
1491                 case 0:\r
1492                         nomain = true;\r
1493                         break;\r
1494                 case 1:\r
1495                         noems = true;\r
1496                         break;\r
1497                 case 2:\r
1498                         noxms = true;\r
1499                         break;\r
1500                 }\r
1501         }\r
1502 \r
1503         //0000+=+=PML_OpenPageFile(gvar);\r
1504 \r
1505         if (!noems && MML_CheckForEMS())\r
1506                 PML_StartupEMS(gvar);\r
1507         if (!noxms && MML_CheckForXMS())\r
1508                 PML_StartupXMS(gvar);\r
1509         if(!nomain)\r
1510                 PML_StartupMainMem(gvar);\r
1511 \r
1512         if (!gvar->pm.mm.MainPresent && !gvar->pm.emm.EMSPresent && !gvar->pm.xmm.XMSPresent)\r
1513         {\r
1514                 Quit ("PM_Startup: No main or EMS\n");\r
1515                 //return;\r
1516         }\r
1517 \r
1518         PM_Reset(gvar);\r
1519 \r
1520         gvar->pm.PMStarted = true;\r
1521 }\r
1522 \r
1523 //\r
1524 //      PM_Shutdown() - Shut down the Page Mgr\r
1525 //\r
1526 void\r
1527 PM_Shutdown(global_game_variables_t *gvar)\r
1528 {\r
1529         if(MML_CheckForXMS()) PML_ShutdownXMS(gvar);\r
1530         if(MML_CheckForEMS()) PML_ShutdownEMS(gvar);\r
1531 \r
1532         if (!gvar->pm.PMStarted)\r
1533                 return;\r
1534 \r
1535         //0000+=+=PML_ClosePageFile(gvar);\r
1536 \r
1537         PML_ShutdownMainMem(gvar);\r
1538 }\r