16/WOLFSRC/ID_MM.C

   1 // NEWMM.C\r
   2 \r
   3 /*\r
   4 =============================================================================\r
   5 \r
   6                    ID software memory manager\r
   7                    --------------------------\r
   8 \r
   9 Primary coder: John Carmack\r
  10 \r
  11 RELIES ON\r
  12 ---------\r
  13 Quit (char *error) function\r
  14 \r
  15 \r
  16 WORK TO DO\r
  17 ----------\r
  18 MM_SizePtr to change the size of a given pointer\r
  19 \r
  20 Multiple purge levels utilized\r
  21 \r
  22 EMS / XMS unmanaged routines\r
  23 \r
  24 =============================================================================\r
  25 */\r
  26 \r
  27 #include "ID_HEADS.H"\r
  28 #pragma hdrstop\r
  29 \r
  30 #pragma warn -pro\r
  31 #pragma warn -use\r
  32 \r
  33 /*\r
  34 =============================================================================\r
  35 \r
  36                                                         LOCAL INFO\r
  37 \r
  38 =============================================================================\r
  39 */\r
  40 \r
  41 #define LOCKBIT         0x80    // if set in attributes, block cannot be moved\r
  42 #define PURGEBITS       3               // 0-3 level, 0= unpurgable, 3= purge first\r
  43 #define PURGEMASK       0xfffc\r
  44 #define BASEATTRIBUTES  0       // unlocked, non purgable\r
  45 \r
  46 #define MAXUMBS         10\r
  47 \r
  48 typedef struct mmblockstruct\r
  49 {\r
  50         unsigned        start,length;\r
  51         unsigned        attributes;\r
  52         memptr          *useptr;        // pointer to the segment start\r
  53         struct mmblockstruct far *next;\r
  54 } mmblocktype;\r
  55 \r
  56 \r
  57 //#define GETNEWBLOCK {if(!(mmnew=mmfree))Quit("MM_GETNEWBLOCK: No free blocks!")\\r
  58 //      ;mmfree=mmfree->next;}\r
  59 \r
  60 #define GETNEWBLOCK {if(!mmfree)MML_ClearBlock();mmnew=mmfree;mmfree=mmfree->next;}\r
  61 \r
  62 #define FREEBLOCK(x) {*x->useptr=NULL;x->next=mmfree;mmfree=x;}\r
  63 \r
  64 /*\r
  65 =============================================================================\r
  66 \r
  67                                                  GLOBAL VARIABLES\r
  68 \r
  69 =============================================================================\r
  70 */\r
  71 \r
  72 mminfotype      mminfo;\r
  73 memptr          bufferseg;\r
  74 boolean         mmerror;\r
  75 \r
  76 void            (* beforesort) (void);\r
  77 void            (* aftersort) (void);\r
  78 \r
  79 /*\r
  80 =============================================================================\r
  81 \r
  82                                                  LOCAL VARIABLES\r
  83 \r
  84 =============================================================================\r
  85 */\r
  86 \r
  87 boolean         mmstarted;\r
  88 \r
  89 void far        *farheap;\r
  90 void            *nearheap;\r
  91 \r
  92 mmblocktype     far mmblocks[MAXBLOCKS]\r
  93                         ,far *mmhead,far *mmfree,far *mmrover,far *mmnew;\r
  94 \r
  95 boolean         bombonerror;\r
  96 \r
  97 //unsigned      totalEMSpages,freeEMSpages,EMSpageframe,EMSpagesmapped,EMShandle;\r
  98 \r
  99 void            (* XMSaddr) (void);             // far pointer to XMS driver\r
 100 \r
 101 unsigned        numUMBs,UMBbase[MAXUMBS];\r
 102 \r
 103 //==========================================================================\r
 104 \r
 105 //\r
 106 // local prototypes\r
 107 //\r
 108 \r
 109 boolean         MML_CheckForEMS (void);\r
 110 void            MML_ShutdownEMS (void);\r
 111 void            MM_MapEMS (void);\r
 112 boolean         MML_CheckForXMS (void);\r
 113 void            MML_ShutdownXMS (void);\r
 114 void            MML_UseSpace (unsigned segstart, unsigned seglength);\r
 115 void            MML_ClearBlock (void);\r
 116 \r
 117 //==========================================================================\r
 118 \r
 119 /*\r
 120 ======================\r
 121 =\r
 122 = MML_CheckForXMS\r
 123 =\r
 124 = Check for XMM driver\r
 125 =\r
 126 =======================\r
 127 */\r
 128 \r
 129 boolean MML_CheckForXMS (void)\r
 130 {\r
 131         numUMBs = 0;\r
 132 \r
 133 asm {\r
 134         mov     ax,0x4300\r
 135         int     0x2f                            // query status of installed diver\r
 136         cmp     al,0x80\r
 137         je      good\r
 138         }\r
 139 \r
 140         return false;\r
 141 good:\r
 142         return true;\r
 143 }\r
 144 \r
 145 \r
 146 /*\r
 147 ======================\r
 148 =\r
 149 = MML_SetupXMS\r
 150 =\r
 151 = Try to allocate all upper memory block\r
 152 =\r
 153 =======================\r
 154 */\r
 155 \r
 156 void MML_SetupXMS (void)\r
 157 {\r
 158         unsigned        base,size;\r
 159 \r
 160 asm     {\r
 161         mov     ax,0x4310\r
 162         int     0x2f\r
 163         mov     [WORD PTR XMSaddr],bx\r
 164         mov     [WORD PTR XMSaddr+2],es         // function pointer to XMS driver\r
 165         }\r
 166 \r
 167 getmemory:\r
 168 asm     {\r
 169         mov     ah,XMS_ALLOCUMB\r
 170         mov     dx,0xffff                                       // try for largest block possible\r
 171         call    [DWORD PTR XMSaddr]\r
 172         or      ax,ax\r
 173         jnz     gotone\r
 174 \r
 175         cmp     bl,0xb0                                         // error: smaller UMB is available\r
 176         jne     done;\r
 177 \r
 178         mov     ah,XMS_ALLOCUMB\r
 179         call    [DWORD PTR XMSaddr]             // DX holds largest available UMB\r
 180         or      ax,ax\r
 181         jz      done                                            // another error...\r
 182         }\r
 183 \r
 184 gotone:\r
 185 asm     {\r
 186         mov     [base],bx\r
 187         mov     [size],dx\r
 188         }\r
 189         MML_UseSpace (base,size);\r
 190         mminfo.XMSmem += size*16;\r
 191         UMBbase[numUMBs] = base;\r
 192         numUMBs++;\r
 193         if (numUMBs < MAXUMBS)\r
 194                 goto getmemory;\r
 195 \r
 196 done:;\r
 197 }\r
 198 \r
 199 \r
 200 /*\r
 201 ======================\r
 202 =\r
 203 = MML_ShutdownXMS\r
 204 =\r
 205 ======================\r
 206 */\r
 207 \r
 208 void MML_ShutdownXMS (void)\r
 209 {\r
 210         int     i;\r
 211         unsigned        base;\r
 212 \r
 213         for (i=0;i<numUMBs;i++)\r
 214         {\r
 215                 base = UMBbase[i];\r
 216 \r
 217 asm     mov     ah,XMS_FREEUMB\r
 218 asm     mov     dx,[base]\r
 219 asm     call    [DWORD PTR XMSaddr]\r
 220         }\r
 221 }\r
 222 \r
 223 //==========================================================================\r
 224 \r
 225 /*\r
 226 ======================\r
 227 =\r
 228 = MML_UseSpace\r
 229 =\r
 230 = Marks a range of paragraphs as usable by the memory manager\r
 231 = This is used to mark space for the near heap, far heap, ems page frame,\r
 232 = and upper memory blocks\r
 233 =\r
 234 ======================\r
 235 */\r
 236 \r
 237 void MML_UseSpace (unsigned segstart, unsigned seglength)\r
 238 {\r
 239         mmblocktype far *scan,far *last;\r
 240         unsigned        oldend;\r
 241         long            extra;\r
 242 \r
 243         scan = last = mmhead;\r
 244         mmrover = mmhead;               // reset rover to start of memory\r
 245 \r
 246 //\r
 247 // search for the block that contains the range of segments\r
 248 //\r
 249         while (scan->start+scan->length < segstart)\r
 250         {\r
 251                 last = scan;\r
 252                 scan = scan->next;\r
 253         }\r
 254 \r
 255 //\r
 256 // take the given range out of the block\r
 257 //\r
 258         oldend = scan->start + scan->length;\r
 259         extra = oldend - (segstart+seglength);\r
 260         if (extra < 0)\r
 261                 Quit ("MML_UseSpace: Segment spans two blocks!");\r
 262 \r
 263         if (segstart == scan->start)\r
 264         {\r
 265                 last->next = scan->next;                        // unlink block\r
 266                 FREEBLOCK(scan);\r
 267                 scan = last;\r
 268         }\r
 269         else\r
 270                 scan->length = segstart-scan->start;    // shorten block\r
 271 \r
 272         if (extra > 0)\r
 273         {\r
 274                 GETNEWBLOCK;\r
 275                 mmnew->useptr = NULL;\r
 276 \r
 277                 mmnew->next = scan->next;\r
 278                 scan->next = mmnew;\r
 279                 mmnew->start = segstart+seglength;\r
 280                 mmnew->length = extra;\r
 281                 mmnew->attributes = LOCKBIT;\r
 282         }\r
 283 \r
 284 }\r
 285 \r
 286 //==========================================================================\r
 287 \r
 288 /*\r
 289 ====================\r
 290 =\r
 291 = MML_ClearBlock\r
 292 =\r
 293 = We are out of blocks, so free a purgable block\r
 294 =\r
 295 ====================\r
 296 */\r
 297 \r
 298 void MML_ClearBlock (void)\r
 299 {\r
 300         mmblocktype far *scan,far *last;\r
 301 \r
 302         scan = mmhead->next;\r
 303 \r
 304         while (scan)\r
 305         {\r
 306                 if (!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS) )\r
 307                 {\r
 308                         MM_FreePtr(scan->useptr);\r
 309                         return;\r
 310                 }\r
 311                 scan = scan->next;\r
 312         }\r
 313 \r
 314         Quit ("MM_ClearBlock: No purgable blocks!");\r
 315 }\r
 316 \r
 317 \r
 318 //==========================================================================\r
 319 \r
 320 /*\r
 321 ===================\r
 322 =\r
 323 = MM_Startup\r
 324 =\r
 325 = Grabs all space from turbo with malloc/farmalloc\r
 326 = Allocates bufferseg misc buffer\r
 327 =\r
 328 ===================\r
 329 */\r
 330 \r
 331 static  char *ParmStrings[] = {"noems","noxms",""};\r
 332 \r
 333 void MM_Startup (void)\r
 334 {\r
 335         int i;\r
 336         unsigned        long length;\r
 337         void far        *start;\r
 338         unsigned        segstart,seglength,endfree;\r
 339 \r
 340         if (mmstarted)\r
 341                 MM_Shutdown ();\r
 342 \r
 343 \r
 344         mmstarted = true;\r
 345         bombonerror = true;\r
 346 //\r
 347 // set up the linked list (everything in the free list;\r
 348 //\r
 349         mmhead = NULL;\r
 350         mmfree = &mmblocks[0];\r
 351         for (i=0;i<MAXBLOCKS-1;i++)\r
 352                 mmblocks[i].next = &mmblocks[i+1];\r
 353         mmblocks[i].next = NULL;\r
 354 \r
 355 //\r
 356 // locked block of all memory until we punch out free space\r
 357 //\r
 358         GETNEWBLOCK;\r
 359         mmhead = mmnew;                         // this will allways be the first node\r
 360         mmnew->start = 0;\r
 361         mmnew->length = 0xffff;\r
 362         mmnew->attributes = LOCKBIT;\r
 363         mmnew->next = NULL;\r
 364         mmrover = mmhead;\r
 365 \r
 366 \r
 367 //\r
 368 // get all available near conventional memory segments\r
 369 //\r
 370         length=coreleft();\r
 371         start = (void far *)(nearheap = malloc(length));\r
 372 \r
 373         length -= 16-(FP_OFF(start)&15);\r
 374         length -= SAVENEARHEAP;\r
 375         seglength = length / 16;                        // now in paragraphs\r
 376         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;\r
 377         MML_UseSpace (segstart,seglength);\r
 378         mminfo.nearheap = length;\r
 379 \r
 380 //\r
 381 // get all available far conventional memory segments\r
 382 //\r
 383         length=farcoreleft();\r
 384         start = farheap = farmalloc(length);\r
 385         length -= 16-(FP_OFF(start)&15);\r
 386         length -= SAVEFARHEAP;\r
 387         seglength = length / 16;                        // now in paragraphs\r
 388         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;\r
 389         MML_UseSpace (segstart,seglength);\r
 390         mminfo.farheap = length;\r
 391         mminfo.mainmem = mminfo.nearheap + mminfo.farheap;\r
 392 \r
 393 //\r
 394 // allocate the misc buffer\r
 395 //\r
 396         mmrover = mmhead;               // start looking for space after low block\r
 397 \r
 398         MM_GetPtr (&bufferseg,BUFFERSIZE);\r
 399 }\r
 400 \r
 401 //==========================================================================\r
 402 \r
 403 /*\r
 404 ====================\r
 405 =\r
 406 = MM_Shutdown\r
 407 =\r
 408 = Frees all conventional, EMS, and XMS allocated\r
 409 =\r
 410 ====================\r
 411 */\r
 412 \r
 413 void MM_Shutdown (void)\r
 414 {\r
 415   if (!mmstarted)\r
 416         return;\r
 417 \r
 418   farfree (farheap);\r
 419   free (nearheap);\r
 420 //  MML_ShutdownXMS ();\r
 421 }\r
 422 \r
 423 //==========================================================================\r
 424 \r
 425 /*\r
 426 ====================\r
 427 =\r
 428 = MM_GetPtr\r
 429 =\r
 430 = Allocates an unlocked, unpurgable block\r
 431 =\r
 432 ====================\r
 433 */\r
 434 \r
 435 void MM_GetPtr (memptr *baseptr,unsigned long size)\r
 436 {\r
 437         mmblocktype far *scan,far *lastscan,far *endscan\r
 438                                 ,far *purge,far *next;\r
 439         int                     search;\r
 440         unsigned        needed,startseg;\r
 441 \r
 442         needed = (size+15)/16;          // convert size from bytes to paragraphs\r
 443 \r
 444         GETNEWBLOCK;                            // fill in start and next after a spot is found\r
 445         mmnew->length = needed;\r
 446         mmnew->useptr = baseptr;\r
 447         mmnew->attributes = BASEATTRIBUTES;\r
 448 \r
 449 tryagain:\r
 450         for (search = 0; search<3; search++)\r
 451         {\r
 452         //\r
 453         // first search:        try to allocate right after the rover, then on up\r
 454         // second search:       search from the head pointer up to the rover\r
 455         // third search:        compress memory, then scan from start\r
 456                 if (search == 1 && mmrover == mmhead)\r
 457                         search++;\r
 458 \r
 459                 switch (search)\r
 460                 {\r
 461                 case 0:\r
 462                         lastscan = mmrover;\r
 463                         scan = mmrover->next;\r
 464                         endscan = NULL;\r
 465                         break;\r
 466                 case 1:\r
 467                         lastscan = mmhead;\r
 468                         scan = mmhead->next;\r
 469                         endscan = mmrover;\r
 470                         break;\r
 471                 case 2:\r
 472                         MM_SortMem ();\r
 473                         lastscan = mmhead;\r
 474                         scan = mmhead->next;\r
 475                         endscan = NULL;\r
 476                         break;\r
 477                 }\r
 478 \r
 479                 startseg = lastscan->start + lastscan->length;\r
 480 \r
 481                 while (scan != endscan)\r
 482                 {\r
 483                         if (scan->start - startseg >= needed)\r
 484                         {\r
 485                         //\r
 486                         // got enough space between the end of lastscan and\r
 487                         // the start of scan, so throw out anything in the middle\r
 488                         // and allocate the new block\r
 489                         //\r
 490                                 purge = lastscan->next;\r
 491                                 lastscan->next = mmnew;\r
 492                                 mmnew->start = *(unsigned *)baseptr = startseg;\r
 493                                 mmnew->next = scan;\r
 494                                 while ( purge != scan)\r
 495                                 {       // free the purgable block\r
 496                                         next = purge->next;\r
 497                                         FREEBLOCK(purge);\r
 498                                         purge = next;           // purge another if not at scan\r
 499                                 }\r
 500                                 mmrover = mmnew;\r
 501                                 return; // good allocation!\r
 502                         }\r
 503 \r
 504                         //\r
 505                         // if this block is purge level zero or locked, skip past it\r
 506                         //\r
 507                         if ( (scan->attributes & LOCKBIT)\r
 508                                 || !(scan->attributes & PURGEBITS) )\r
 509                         {\r
 510                                 lastscan = scan;\r
 511                                 startseg = lastscan->start + lastscan->length;\r
 512                         }\r
 513 \r
 514 \r
 515                         scan=scan->next;                // look at next line\r
 516                 }\r
 517         }\r
 518 \r
 519         if (bombonerror)\r
 520         {\r
 521 \r
 522 extern char configname[];\r
 523 extern  boolean insetupscaling;\r
 524 extern  int     viewsize;\r
 525 boolean SetViewSize (unsigned width, unsigned height);\r
 526 #define HEIGHTRATIO             0.50\r
 527 //\r
 528 // wolf hack -- size the view down\r
 529 //\r
 530                 if (!insetupscaling && viewsize>10)\r
 531                 {\r
 532 mmblocktype     far *savedmmnew;\r
 533                         savedmmnew = mmnew;\r
 534                         viewsize -= 2;\r
 535                         SetViewSize (viewsize*16,viewsize*16*HEIGHTRATIO);\r
 536                         mmnew = savedmmnew;\r
 537                         goto tryagain;\r
 538                 }\r
 539 \r
 540 //              unlink(configname);\r
 541                 Quit ("MM_GetPtr: Out of memory!");\r
 542         }\r
 543         else\r
 544                 mmerror = true;\r
 545 }\r
 546 \r
 547 //==========================================================================\r
 548 \r
 549 /*\r
 550 ====================\r
 551 =\r
 552 = MM_FreePtr\r
 553 =\r
 554 = Deallocates an unlocked, purgable block\r
 555 =\r
 556 ====================\r
 557 */\r
 558 \r
 559 void MM_FreePtr (memptr *baseptr)\r
 560 {\r
 561         mmblocktype far *scan,far *last;\r
 562 \r
 563         last = mmhead;\r
 564         scan = last->next;\r
 565 \r
 566         if (baseptr == mmrover->useptr) // removed the last allocated block\r
 567                 mmrover = mmhead;\r
 568 \r
 569         while (scan->useptr != baseptr && scan)\r
 570         {\r
 571                 last = scan;\r
 572                 scan = scan->next;\r
 573         }\r
 574 \r
 575         if (!scan)\r
 576                 Quit ("MM_FreePtr: Block not found!");\r
 577 \r
 578         last->next = scan->next;\r
 579 \r
 580         FREEBLOCK(scan);\r
 581 }\r
 582 //==========================================================================\r
 583 \r
 584 /*\r
 585 =====================\r
 586 =\r
 587 = MM_SetPurge\r
 588 =\r
 589 = Sets the purge level for a block (locked blocks cannot be made purgable)\r
 590 =\r
 591 =====================\r
 592 */\r
 593 \r
 594 void MM_SetPurge (memptr *baseptr, int purge)\r
 595 {\r
 596         mmblocktype far *start;\r
 597 \r
 598         start = mmrover;\r
 599 \r
 600         do\r
 601         {\r
 602                 if (mmrover->useptr == baseptr)\r
 603                         break;\r
 604 \r
 605                 mmrover = mmrover->next;\r
 606 \r
 607                 if (!mmrover)\r
 608                         mmrover = mmhead;\r
 609                 else if (mmrover == start)\r
 610                         Quit ("MM_SetPurge: Block not found!");\r
 611 \r
 612         } while (1);\r
 613 \r
 614         mmrover->attributes &= ~PURGEBITS;\r
 615         mmrover->attributes |= purge;\r
 616 }\r
 617 \r
 618 //==========================================================================\r
 619 \r
 620 /*\r
 621 =====================\r
 622 =\r
 623 = MM_SetLock\r
 624 =\r
 625 = Locks / unlocks the block\r
 626 =\r
 627 =====================\r
 628 */\r
 629 \r
 630 void MM_SetLock (memptr *baseptr, boolean locked)\r
 631 {\r
 632         mmblocktype far *start;\r
 633 \r
 634         start = mmrover;\r
 635 \r
 636         do\r
 637         {\r
 638                 if (mmrover->useptr == baseptr)\r
 639                         break;\r
 640 \r
 641                 mmrover = mmrover->next;\r
 642 \r
 643                 if (!mmrover)\r
 644                         mmrover = mmhead;\r
 645                 else if (mmrover == start)\r
 646                         Quit ("MM_SetLock: Block not found!");\r
 647 \r
 648         } while (1);\r
 649 \r
 650         mmrover->attributes &= ~LOCKBIT;\r
 651         mmrover->attributes |= locked*LOCKBIT;\r
 652 }\r
 653 \r
 654 //==========================================================================\r
 655 \r
 656 /*\r
 657 =====================\r
 658 =\r
 659 = MM_SortMem\r
 660 =\r
 661 = Throws out all purgable stuff and compresses movable blocks\r
 662 =\r
 663 =====================\r
 664 */\r
 665 \r
 666 void MM_SortMem (void)\r
 667 {\r
 668         mmblocktype far *scan,far *last,far *next;\r
 669         unsigned        start,length,source,dest;\r
 670         int                     playing;\r
 671 \r
 672         //\r
 673         // lock down a currently playing sound\r
 674         //\r
 675         playing = SD_SoundPlaying ();\r
 676         if (playing)\r
 677         {\r
 678                 switch (SoundMode)\r
 679                 {\r
 680                 case sdm_PC:\r
 681                         playing += STARTPCSOUNDS;\r
 682                         break;\r
 683                 case sdm_AdLib:\r
 684                         playing += STARTADLIBSOUNDS;\r
 685                         break;\r
 686                 }\r
 687                 MM_SetLock(&(memptr)audiosegs[playing],true);\r
 688         }\r
 689 \r
 690 \r
 691         SD_StopSound();\r
 692 \r
 693         if (beforesort)\r
 694                 beforesort();\r
 695 \r
 696         scan = mmhead;\r
 697 \r
 698         last = NULL;            // shut up compiler warning\r
 699 \r
 700         while (scan)\r
 701         {\r
 702                 if (scan->attributes & LOCKBIT)\r
 703                 {\r
 704                 //\r
 705                 // block is locked, so try to pile later blocks right after it\r
 706                 //\r
 707                         start = scan->start + scan->length;\r
 708                 }\r
 709                 else\r
 710                 {\r
 711                         if (scan->attributes & PURGEBITS)\r
 712                         {\r
 713                         //\r
 714                         // throw out the purgable block\r
 715                         //\r
 716                                 next = scan->next;\r
 717                                 FREEBLOCK(scan);\r
 718                                 last->next = next;\r
 719                                 scan = next;\r
 720                                 continue;\r
 721                         }\r
 722                         else\r
 723                         {\r
 724                         //\r
 725                         // push the non purgable block on top of the last moved block\r
 726                         //\r
 727                                 if (scan->start != start)\r
 728                                 {\r
 729                                         length = scan->length;\r
 730                                         source = scan->start;\r
 731                                         dest = start;\r
 732                                         while (length > 0xf00)\r
 733                                         {\r
 734                                                 movedata(source,0,dest,0,0xf00*16);\r
 735                                                 length -= 0xf00;\r
 736                                                 source += 0xf00;\r
 737                                                 dest += 0xf00;\r
 738                                         }\r
 739                                         movedata(source,0,dest,0,length*16);\r
 740 \r
 741                                         scan->start = start;\r
 742                                         *(unsigned *)scan->useptr = start;\r
 743                                 }\r
 744                                 start = scan->start + scan->length;\r
 745                         }\r
 746                 }\r
 747 \r
 748                 last = scan;\r
 749                 scan = scan->next;              // go to next block\r
 750         }\r
 751 \r
 752         mmrover = mmhead;\r
 753 \r
 754         if (aftersort)\r
 755                 aftersort();\r
 756 \r
 757         if (playing)\r
 758                 MM_SetLock(&(memptr)audiosegs[playing],false);\r
 759 }\r
 760 \r
 761 \r
 762 //==========================================================================\r
 763 \r
 764 /*\r
 765 =====================\r
 766 =\r
 767 = MM_ShowMemory\r
 768 =\r
 769 =====================\r
 770 */\r
 771 \r
 772 void MM_ShowMemory (void)\r
 773 {\r
 774         mmblocktype far *scan;\r
 775         unsigned color,temp,x,y;\r
 776         long    end,owner;\r
 777         char    scratch[80],str[10];\r
 778 \r
 779         temp = bufferofs;\r
 780         bufferofs = displayofs;\r
 781         scan = mmhead;\r
 782 \r
 783         end = -1;\r
 784 \r
 785         while (scan)\r
 786         {\r
 787                 if (scan->attributes & PURGEBITS)\r
 788                         color = 5;              // dark purple = purgable\r
 789                 else\r
 790                         color = 9;              // medium blue = non purgable\r
 791                 if (scan->attributes & LOCKBIT)\r
 792                         color = 12;             // red = locked\r
 793                 if (scan->start<=end)\r
 794                         Quit ("MM_ShowMemory: Memory block order currupted!");\r
 795                 end = scan->length-1;\r
 796                 y = scan->start/320;\r
 797                 x = scan->start%320;\r
 798                 VW_Hlin(x,x+end,y,color);\r
 799                 VW_Plot(x,y,15);\r
 800                 if (scan->next && scan->next->start > end+1)\r
 801                         VW_Hlin(x+end+1,x+(scan->next->start-scan->start),y,0); // black = free\r
 802 \r
 803                 scan = scan->next;\r
 804         }\r
 805 \r
 806         VW_FadeIn ();\r
 807         IN_Ack();\r
 808 \r
 809         bufferofs = temp;\r
 810 }\r
 811 \r
 812 //==========================================================================\r
 813 \r
 814 /*\r
 815 =====================\r
 816 =\r
 817 = MM_DumpData\r
 818 =\r
 819 =====================\r
 820 */\r
 821 \r
 822 void MM_DumpData (void)\r
 823 {\r
 824         mmblocktype far *scan,far *best;\r
 825         long    lowest,oldlowest;\r
 826         unsigned        owner;\r
 827         char    lock,purge;\r
 828         FILE    *dumpfile;\r
 829 \r
 830 \r
 831         free (nearheap);\r
 832         dumpfile = fopen ("MMDUMP.TXT","w");\r
 833         if (!dumpfile)\r
 834                 Quit ("MM_DumpData: Couldn't open MMDUMP.TXT!");\r
 835 \r
 836         lowest = -1;\r
 837         do\r
 838         {\r
 839                 oldlowest = lowest;\r
 840                 lowest = 0xffff;\r
 841 \r
 842                 scan = mmhead;\r
 843                 while (scan)\r
 844                 {\r
 845                         owner = (unsigned)scan->useptr;\r
 846 \r
 847                         if (owner && owner<lowest && owner > oldlowest)\r
 848                         {\r
 849                                 best = scan;\r
 850                                 lowest = owner;\r
 851                         }\r
 852 \r
 853                         scan = scan->next;\r
 854                 }\r
 855 \r
 856                 if (lowest != 0xffff)\r
 857                 {\r
 858                         if (best->attributes & PURGEBITS)\r
 859                                 purge = 'P';\r
 860                         else\r
 861                                 purge = '-';\r
 862                         if (best->attributes & LOCKBIT)\r
 863                                 lock = 'L';\r
 864                         else\r
 865                                 lock = '-';\r
 866                         fprintf (dumpfile,"0x%p (%c%c) = %u\n"\r
 867                         ,(unsigned)lowest,lock,purge,best->length);\r
 868                 }\r
 869 \r
 870         } while (lowest != 0xffff);\r
 871 \r
 872         fclose (dumpfile);\r
 873         Quit ("MMDUMP.TXT created.");\r
 874 }\r
 875 \r
 876 //==========================================================================\r
 877 \r
 878 \r
 879 /*\r
 880 ======================\r
 881 =\r
 882 = MM_UnusedMemory\r
 883 =\r
 884 = Returns the total free space without purging\r
 885 =\r
 886 ======================\r
 887 */\r
 888 \r
 889 long MM_UnusedMemory (void)\r
 890 {\r
 891         unsigned free;\r
 892         mmblocktype far *scan;\r
 893 \r
 894         free = 0;\r
 895         scan = mmhead;\r
 896 \r
 897         while (scan->next)\r
 898         {\r
 899                 free += scan->next->start - (scan->start + scan->length);\r
 900                 scan = scan->next;\r
 901         }\r
 902 \r
 903         return free*16l;\r
 904 }\r
 905 \r
 906 //==========================================================================\r
 907 \r
 908 \r
 909 /*\r
 910 ======================\r
 911 =\r
 912 = MM_TotalFree\r
 913 =\r
 914 = Returns the total free space with purging\r
 915 =\r
 916 ======================\r
 917 */\r
 918 \r
 919 long MM_TotalFree (void)\r
 920 {\r
 921         unsigned free;\r
 922         mmblocktype far *scan;\r
 923 \r
 924         free = 0;\r
 925         scan = mmhead;\r
 926 \r
 927         while (scan->next)\r
 928         {\r
 929                 if ((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))\r
 930                         free += scan->length;\r
 931                 free += scan->next->start - (scan->start + scan->length);\r
 932                 scan = scan->next;\r
 933         }\r
 934 \r
 935         return free*16l;\r
 936 }\r
 937 \r
 938 //==========================================================================\r
 939 \r
 940 /*\r
 941 =====================\r
 942 =\r
 943 = MM_BombOnError\r
 944 =\r
 945 =====================\r
 946 */\r
 947 \r
 948 void MM_BombOnError (boolean bomb)\r
 949 {\r
 950         bombonerror = bomb;\r
 951 }\r
 952 \r
 953 \r