src/lib/16_mm.c

   1 /* Catacomb Apocalypse Source Code
   2  * Copyright (C) 1993-2014 Flat Rock Software
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 // NEWMM.C
  20
  21 /*
  22 =============================================================================
  23
  24                         ID software memory manager
  25                         --------------------------
  26
  27 Primary coder: John Carmack
  28
  29 RELIES ON
  30 ---------
  31 Quit (char *error) function
  32
  33
  34 WORK TO DO
  35 ----------
  36 MM_SizePtr to change the size of a given pointer
  37
  38 Multiple purge levels utilized
  39
  40 EMS / XMS unmanaged routines
  41
  42 =============================================================================
  43 */
  44 /*
  45
  46 Open Watcom port by sparky4
  47
  48 */
  49 #include "src/lib/16_mm.h"
  50
  51 /*
  52 =============================================================================
  53
  54                                                  GLOBAL VARIABLES
  55
  56 =============================================================================
  57 */
  58
  59 void            (* beforesort) (void);
  60 void            (* aftersort) (void);
  61 void            (* XMSaddr) (void);             // far pointer to XMS driver
  62
  63 /*
  64 =============================================================================
  65
  66                                                  LOCAL VARIABLES
  67
  68 =============================================================================
  69 */
  70
  71 static  char *ParmStringsexmm[] = {"noems","noxms",""};
  72
  73 /*
  74 ======================
  75 =
  76 = MML_CheckForEMS
  77 =
  78 = Routine from p36 of Extending DOS
  79 =
  80 =======================
  81 */
  82
  83 boolean MML_CheckForEMS(void)
  84 {
  85         boolean emmcfems;
  86         char    emmname[] = "EMMXXXX0";
  87 //              mov     dx,OFFSET emmname
  88         __asm {
  89                 LEA     DX, emmname     //fix by andrius4669
  90                 mov     ax,0x3d00
  91                 int     0x21            // try to open EMMXXXX0 device
  92                 jc      error
  93
  94                 mov     bx,ax
  95                 mov     ax,0x4400
  96
  97                 int     0x21            // get device info
  98                 jc      error
  99
 100                 and     dx,0x80
 101                 jz      error
 102
 103                 mov     ax,0x4407
 104
 105                 int     0x21            // get status
 106                 jc      error
 107                 or      al,al
 108                 jz      error
 109
 110                 mov     ah,0x3e
 111                 int     0x21            // close handle
 112                 jc      error
 113                 //
 114                 // EMS is good
 115                 //
 116                 mov     emmcfems,1
 117                 jmp End
 118                 error:
 119                 //
 120                 // EMS is bad
 121                 //
 122                 mov     emmcfems,0
 123                 End:
 124         }
 125         return(emmcfems);
 126 }
 127
 128
 129 /*
 130 ======================
 131 =
 132 = MML_SetupEMS
 133 =
 134 =======================
 135 */
 136
 137 unsigned MML_SetupEMS(mminfo_t *mm)
 138 {
 139         char    str[80],str2[10];
 140         unsigned        err;
 141         boolean errorflag=false;
 142         union REGS CPURegs;
 143
 144         unsigned int EMSVer = 0;
 145         unsigned        totalEMSpages,freeEMSpages,EMSpageframe,EMSpagesmapped,EMShandle;
 146         totalEMSpages = freeEMSpages = EMSpageframe = EMSpagesmapped = 0;
 147
 148         __asm
 149                 {
 150                 mov     ah,EMS_STATUS
 151                 int     EMS_INT                                         // make sure EMS hardware is present
 152                 or      ah,ah
 153                 jnz     error
 154
 155                 mov     ah,EMS_VERSION
 156                 int     EMS_INT
 157                 or      ah,ah
 158                 jnz     error
 159                 mov     [EMSVer],ax                             //      set EMSVer
 160                 cmp     al,0x32                                         // only work on ems 3.2 or greater
 161                 jb      error
 162
 163                 mov     ah,EMS_GETFRAME
 164                 int     EMS_INT                                         // find the page frame address
 165                 or      ah,ah
 166                 jnz     error
 167                 mov     [EMSpageframe],bx
 168
 169                 mov     ah,EMS_GETPAGES
 170                 int     EMS_INT                                         // find out how much EMS is there
 171                 or      ah,ah
 172                 jnz     error
 173                 mov     [totalEMSpages],dx
 174                 mov     [freeEMSpages],bx
 175                 or      bx,bx
 176                 jz      noEMS                                           // no EMS at all to allocate
 177 //++++EXPAND DONG!!!!
 178                 cmp     [EMSVer],0x40
 179                 jb      low
 180                 cmp     bx,[freeEMSpages]
 181                 jle     getpages
 182                 mov     bx,[freeEMSpages]
 183                 jmp     getpages
 184
 185 low:
 186                 cmp     bx,4
 187                 jle     getpages                                        // there is only 1,2,3,or 4 pages
 188                 mov     bx,4                                            // we can't use more than 4 pages
 189
 190 getpages:
 191                 mov     [EMSpagesmapped],bx
 192                 mov     ah,EMS_ALLOCPAGES                       // allocate up to 64k of EMS
 193                 int     EMS_INT
 194                 or      ah,ah
 195                 jnz     error
 196                 mov     [EMShandle],dx
 197                 jmp End
 198 error:
 199                 mov     errorflag,1
 200                 jmp End
 201 noEMS:
 202 End:
 203         }
 204         if(errorflag==true)
 205         {
 206                 err = CPURegs.h.ah;
 207                 strcpy(str,"MML_SetupEMS: EMS error 0x");
 208                 itoa(err,str2,16);
 209                 strcpy(str,str2);
 210                 printf("%s\n",str);
 211                 return err;
 212         }
 213         mm->totalEMSpages=totalEMSpages;
 214         mm->freeEMSpages=freeEMSpages;
 215         mm->EMSpageframe=EMSpageframe;
 216         mm->EMSpagesmapped=EMSpagesmapped;
 217         mm->EMShandle=EMShandle;
 218         mm->EMSVer=EMSVer;
 219         return 0;
 220 }
 221
 222
 223 /*
 224 ======================
 225 =
 226 = MML_ShutdownEMS
 227 =
 228 =======================
 229 */
 230
 231 void MML_ShutdownEMS(mminfo_t *mm)
 232 {
 233         boolean errorflag=false;
 234         unsigned EMShandle=mm->EMShandle;
 235
 236         if(!EMShandle)
 237                 return;
 238         __asm
 239         {
 240                 mov     ah,EMS_FREEPAGES
 241                 mov     dx,[EMShandle]
 242                 int     EMS_INT
 243                 or      ah,ah
 244                 jz      ok
 245                 mov     errorflag,1
 246                 ok:
 247         }
 248         if(errorflag==true) printf("MML_ShutdownEMS: Error freeing EMS!");      //++++ add something
 249 }
 250
 251 /*
 252 ====================
 253 =
 254 = MM_MapEMS
 255 =
 256 = Maps the 64k of EMS used by memory manager into the page frame
 257 = for general use.  This only needs to be called if you are keeping
 258 = other things in EMS.
 259 =
 260 ====================
 261 */
 262
 263 unsigned MM_MapEMS(mminfo_t *mm)
 264 {
 265         char    str[80],str2[10];
 266         unsigned        err, EMShandle;
 267         boolean errorflag=false;
 268         int     i;
 269         union REGS CPURegs;
 270         EMShandle=mm->EMShandle;
 271
 272         for (i=0;i<mm->EMSpagesmapped;i++)
 273         {
 274                 __asm
 275                 {
 276                         mov     ah,EMS_MAPPAGE
 277                         mov     bx,[i]                  // logical page
 278                         mov     al,bl                   // physical page
 279                         mov     dx,[EMShandle]  // handle
 280                         int     EMS_INT
 281                         or      ah,ah
 282                         jnz     error
 283                         jmp End
 284                         error:
 285                         mov     errorflag,1
 286                         End:
 287                 }
 288                 if(errorflag==true)
 289                 {
 290                         err = CPURegs.h.ah;
 291                         strcpy(str,"MM_MapEMS: EMS error 0x");
 292                         itoa(err,str2,16);
 293                         strcpy(str,str2);
 294                         printf("%s\n",str);
 295                         return err;
 296                 }
 297         }
 298         return 0;
 299 }
 300
 301 //==========================================================================
 302
 303 /*
 304 ======================
 305 =
 306 = MML_CheckForXMS
 307 =
 308 = Check for XMM driver
 309 =
 310 =======================
 311 */
 312
 313 boolean MML_CheckForXMS(mminfo_t *mm)
 314 {
 315         boolean errorflag=false;
 316         mm->numUMBs = 0;
 317
 318         __asm
 319         {
 320                 mov     ax,0x4300
 321                 int     0x2f                            // query status of installed diver
 322                 cmp     al,0x80
 323                 je      good
 324                 mov     errorflag,1
 325                 good:
 326         }
 327         if(errorflag==true) return false;
 328         else return true;
 329 }
 330
 331
 332 /*
 333 ======================
 334 =
 335 = MML_SetupXMS
 336 =
 337 = Try to allocate all upper memory block
 338 =
 339 =======================
 340 */
 341
 342 void MML_SetupXMS(mminfo_t *mm, mminfotype *mmi)
 343 {
 344         unsigned        base,size;
 345
 346 getmemory:
 347         __asm
 348         {
 349                 mov     ax,0x4310
 350                 int     0x2f
 351                 mov     [WORD PTR XMSaddr],bx
 352                 mov     [WORD PTR XMSaddr+2],es         // function pointer to XMS driver
 353
 354                 mov     ah,XMS_ALLOCUMB
 355                 mov     dx,0xffff                                       // try for largest block possible
 356                 call    [DWORD PTR XMSaddr]
 357                 or      ax,ax
 358                 jnz     gotone
 359
 360                 cmp     bl,0xb0                                         // error: smaller UMB is available
 361                 jne     done;
 362
 363                 mov     ah,XMS_ALLOCUMB
 364                 call    [DWORD PTR XMSaddr]             // DX holds largest available UMB
 365                 or      ax,ax
 366                 jz      done                                            // another error...
 367
 368 gotone:
 369                 mov     [base],bx
 370                 mov     [size],dx
 371 done:
 372         }
 373         MML_UseSpace(base,size, mm);
 374         mmi->XMSmem += size*16;
 375         mm->UMBbase[mm->numUMBs] = base;
 376         mm->numUMBs++;
 377         if(mm->numUMBs < MAXUMBS)
 378                 goto getmemory;
 379 }
 380
 381
 382 /*
 383 ======================
 384 =
 385 = MML_ShutdownXMS
 386 =
 387 ======================
 388 */
 389
 390 void MML_ShutdownXMS(mminfo_t *mm)
 391 {
 392         int     i;
 393         unsigned        base;
 394
 395         for (i=0;i<mm->numUMBs;i++)
 396         {
 397                 base = mm->UMBbase[i];
 398                 __asm
 399                 {
 400                         mov     ah,XMS_FREEUMB
 401                         mov     dx,[base]
 402                         call    [DWORD PTR XMSaddr]
 403                 }
 404         }
 405 }
 406
 407 //==========================================================================
 408
 409 /*
 410 ======================
 411 =
 412 = MML_UseSpace
 413 =
 414 = Marks a range of paragraphs as usable by the memory manager
 415 = This is used to mark space for the near heap, far heap, ems page frame,
 416 = and upper memory blocks
 417 =
 418 ======================
 419 */
 420
 421 void MML_UseSpace(unsigned segstart, dword seglength, mminfo_t *mm)
 422 {
 423         mmblocktype huge *scan,huge *last;
 424         dword   oldend;
 425         dword fat=0;
 426         word segm=0;
 427         dword           extra;
 428
 429         scan = last = mm->mmhead;
 430         mm->mmrover = mm->mmhead;               // reset rover to start of memory
 431
 432 //
 433 // search for the block that contains the range of segments
 434 //
 435         while(scan->start+scan->length < segstart)
 436         {
 437                 last = scan;
 438                 scan = scan->next;
 439         }
 440
 441 //
 442 // take the given range out of the block
 443 //
 444         oldend = scan->start + scan->length;
 445         extra = oldend - (segstart+seglength);
 446         //++++emsver stuff!
 447         if(extra>0xfffflu)
 448         {
 449                 segm=(extra%(0xfffflu))-1;
 450                 fat=segm*(0xfffflu);
 451                 extra-=fat;
 452 //printf("extra=%lu     ", extra);
 453 //printf("segm=%lu\n", segm);
 454                 printf("MML_UseSpace: Segment spans two blocks!\n");
 455         }
 456
 457 //segu:
 458 //++++todo: linked list of segment!
 459 //printf("segm=%lu\n", segm);
 460         if(segstart == scan->start)
 461         {
 462                 last->next = scan->next;                        // unlink block
 463                 MM_FreeBlock(scan, mm);
 464                 scan = last;
 465         }
 466         else
 467                 scan->length = segstart-scan->start;    // shorten block
 468
 469 //      segm--;
 470
 471         if(0xfffflu > extra > 0)
 472         {
 473                 MM_GetNewBlock(mm);
 474                 mm->mmnew->next = scan->next;
 475                 scan->next = mm->mmnew;
 476                 mm->mmnew->start = segstart+seglength;
 477                 mm->mmnew->length = extra;
 478                 mm->mmnew->attributes = LOCKBIT;
 479         }//else if(segm>0) goto segu;
 480
 481 }
 482
 483 //==========================================================================
 484
 485 /*
 486 ====================
 487 =
 488 = MML_ClearBlock
 489 =
 490 = We are out of blocks, so free a purgable block
 491 =
 492 ====================
 493 */
 494
 495 void MML_ClearBlock(mminfo_t *mm)
 496 {
 497         mmblocktype huge *scan,huge *last;
 498
 499         scan = mm->mmhead->next;
 500
 501         while(scan)
 502         {
 503                 if(!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS))
 504                 {
 505                         MM_FreePtr(scan->useptr, mm);
 506                         return;
 507                 }
 508                 scan = scan->next;
 509         }
 510
 511         printf("MM_ClearBlock: No purgable blocks!\n");
 512 }
 513
 514
 515 //==========================================================================
 516
 517 /*
 518 ===================
 519 =
 520 = MM_Startup
 521 =
 522 = Grabs all space from turbo with malloc/farmalloc
 523 = Allocates bufferseg misc buffer
 524 =
 525 ===================
 526 */
 527
 528 void MM_Startup(mminfo_t *mm, mminfotype *mmi)
 529 {
 530         int i;
 531         dword length;//,farlen;
 532         void huge       *start;
 533         unsigned        segstart,seglength,endfree;
 534
 535         if(mm->mmstarted)
 536                 MM_Shutdown(mm);
 537
 538         mm->mmstarted = true;
 539         mm->bombonerror = true;
 540 //
 541 // set up the linked list (everything in the free list;
 542 //
 543         mm->mmhead = NULL;
 544         mm->mmfree = &(mm->mmblocks[0]);
 545         for(i=0;i<MAXBLOCKS-1;i++)
 546         {
 547                 mm->mmblocks[i].next = &(mm->mmblocks[i+1]);
 548         }
 549         mm->mmblocks[i].next = NULL;
 550
 551 //
 552 // locked block of all memory until we punch out free space
 553 //
 554         MM_GetNewBlock(mm);
 555         mm->mmhead = mm->mmnew;                         // this will allways be the first node
 556         mm->mmnew->start = 0;
 557         mm->mmnew->length = 0xffff;                     //todo: mm make it fucking massive as fuck!~
 558         mm->mmnew->attributes = LOCKBIT;
 559         mm->mmnew->next = NULL;
 560         mm->mmrover = mm->mmhead;
 561
 562 //      farlen=_bios_memsize()*1024;
 563
 564 //
 565 // get all available near conventional memory segments
 566 //
 567 //----  length=coreleft();
 568         _nheapgrow();
 569         length=_memavl();
 570         start = (void huge *)(mm->nearheap = malloc(length));
 571
 572         length -= 16-(FP_OFF(start)&15);
 573         length -= SAVENEARHEAP;
 574         seglength = length / 16;                        // now in paragraphs
 575         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 576         MML_UseSpace(segstart,seglength, mm);
 577         mmi->nearheap = length;
 578
 579 //
 580 // get all available far conventional memory segments
 581 //
 582 //----  length=farcoreleft();
 583         _fheapgrow();
 584         length=_memavl();
 585         //length-=farlen;
 586         start = mm->farheap = halloc(length, sizeof(length));
 587         //start = mm->farheap = _fmalloc(length);
 588         length -= 16-(FP_OFF(start)&15);
 589         length -= SAVEFARHEAP;
 590         seglength = length / 16;                        // now in paragraphs
 591         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 592         MML_UseSpace(segstart,seglength, mm);
 593         mmi->farheap = length;
 594         mmi->mainmem = mmi->nearheap + mmi->farheap;
 595
 596
 597 //
 598 // detect EMS and allocate up to 64K at page frame
 599 //
 600         mmi->EMSmem = 0;
 601         for(i = 1;i < __argc;i++)
 602         {
 603                 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 604                         goto emsskip;                           // param NOEMS
 605         }
 606         printf("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0");     //bug!
 607         if(MML_CheckForEMS())
 608         {
 609 //printf("EMS1\n");
 610                 MML_SetupEMS(mm);                                       // allocate space
 611                 printf("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0");     //bug!
 612                 //TODO: EMS4! AND EMS 3.2 MASSIVE DATA HANDLMENT!
 613                 MML_UseSpace(mm->EMSpageframe,((dword)mm->EMSpagesmapped)*0x4000lu, mm);
 614 //printf("EMS3\n");
 615                 MM_MapEMS(mm);                                  // map in used pages
 616 //printf("EMS4\n");
 617                 mmi->EMSmem = ((dword)mm->EMSpagesmapped)*0x4000lu;
 618         }
 619
 620 //
 621 // detect XMS and get upper memory blocks
 622 //
 623 emsskip:
 624         mmi->XMSmem = 0;
 625         for(i = 1;i < __argc;i++)
 626         {
 627                 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 628                         goto xmsskip;                           // param NOXMS
 629         }
 630 //      printf("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0");     //bug!
 631         if(MML_CheckForXMS(mm))
 632         {
 633 //printf("XMS!\n");
 634                 MML_SetupXMS(mm, mmi);                                  // allocate as many UMBs as possible
 635         }
 636
 637 //
 638 // allocate the misc buffer
 639 //
 640 xmsskip:
 641         mm->mmrover = mm->mmhead;               // start looking for space after low block
 642
 643         MM_GetPtr(&(mm->bufferseg),BUFFERSIZE, mm, mmi);
 644 }
 645
 646 //==========================================================================
 647
 648 /*
 649 ====================
 650 =
 651 = MM_Shutdown
 652 =
 653 = Frees all conventional, EMS, and XMS allocated
 654 =
 655 ====================
 656 */
 657
 658 void MM_Shutdown(mminfo_t *mm)
 659 {
 660         if(!(mm->mmstarted))
 661                 return;
 662
 663         _ffree(mm->farheap);
 664         printf("far freed\n");
 665         free(mm->nearheap);
 666         printf("near freed\n");
 667         //hfree(mm->hugeheap);
 668         //printf("huge freed\n");
 669         if(MML_CheckForEMS()){ MML_ShutdownEMS(mm); printf("EMS freed\n"); }
 670         if(MML_CheckForXMS(mm)){ MML_ShutdownXMS(mm); printf("XMS freed\n"); }
 671 }
 672
 673 //==========================================================================
 674
 675 /*
 676 ====================
 677 =
 678 = MM_GetPtr
 679 =
 680 = Allocates an unlocked, unpurgable block
 681 =
 682 ====================
 683 */
 684
 685 void MM_GetPtr(memptr *baseptr,dword size, mminfo_t *mm, mminfotype *mmi)
 686 {
 687         mmblocktype huge *scan,huge *lastscan,huge *endscan,huge *purge,huge *next;
 688         int                     search;
 689         unsigned        needed,startseg;
 690
 691         needed = (size+15)/16;          // convert size from bytes to paragraphs
 692
 693         MM_GetNewBlock(mm);                             // fill in start and next after a spot is found
 694         mm->mmnew->length = needed;
 695         mm->mmnew->useptr = baseptr;
 696         mm->mmnew->attributes = BASEATTRIBUTES;
 697
 698         for(search = 0; search<3; search++)
 699         {
 700         //
 701         // first search:        try to allocate right after the rover, then on up
 702         // second search:       search from the head pointer up to the rover
 703         // third search:        compress memory, then scan from start
 704                 if(search == 1 && mm->mmrover == mm->mmhead)
 705                         search++;
 706
 707                 switch(search)
 708                 {
 709                 case 0:
 710                         lastscan = mm->mmrover;
 711                         scan = mm->mmrover->next;
 712                         endscan = NULL;
 713                         break;
 714                 case 1:
 715                         lastscan = mm->mmhead;
 716                         scan = mm->mmhead->next;
 717                         endscan = mm->mmrover;
 718                         break;
 719                 case 2:
 720                         MM_SortMem(mm);
 721                         lastscan = mm->mmhead;
 722                         scan = mm->mmhead->next;
 723                         endscan = NULL;
 724                         break;
 725                 }
 726
 727                 startseg = lastscan->start + lastscan->length;
 728
 729                 while(scan != endscan)
 730                 {
 731                         if(scan->start - startseg >= needed)
 732                         {
 733                         //
 734                         // got enough space between the end of lastscan and
 735                         // the start of scan, so throw out anything in the middle
 736                         // and allocate the new block
 737                         //
 738                                 purge = lastscan->next;
 739                                 lastscan->next = mm->mmnew;
 740                                 mm->mmnew->start = *(unsigned *)baseptr = startseg;
 741                                 mm->mmnew->next = scan;
 742                                 while(purge != scan)
 743                                 {       // free the purgable block
 744                                         next = purge->next;
 745                                         MM_FreeBlock(purge, mm);
 746                                         purge = next;           // purge another if not at scan
 747                                 }
 748                                 mm->mmrover = mm->mmnew;
 749                                 return; // good allocation!
 750                         }
 751
 752                         //
 753                         // if this block is purge level zero or locked, skip past it
 754                         //
 755                         if((scan->attributes & LOCKBIT)
 756                                 || !(scan->attributes & PURGEBITS) )
 757                         {
 758                                 lastscan = scan;
 759                                 startseg = lastscan->start + lastscan->length;
 760                         }
 761
 762
 763                         scan=scan->next;                // look at next line
 764                 }
 765         }
 766
 767         if (mm->bombonerror)
 768                 printf(OUT_OF_MEM_MSG,(size-mmi->nearheap));
 769         else
 770                 mm->mmerror = true;
 771 }
 772
 773 //==========================================================================
 774
 775 /*
 776 ====================
 777 =
 778 = MM_FreePtr
 779 =
 780 = Allocates an unlocked, unpurgable block
 781 =
 782 ====================
 783 */
 784
 785 void MM_FreePtr(memptr *baseptr, mminfo_t *mm)
 786 {
 787         mmblocktype huge *scan,huge *last;
 788
 789         last = mm->mmhead;
 790         scan = last->next;
 791
 792         if(baseptr == mm->mmrover->useptr)      // removed the last allocated block
 793                 mm->mmrover = mm->mmhead;
 794
 795         while(scan->useptr != baseptr && scan)
 796         {
 797                 last = scan;
 798                 scan = scan->next;
 799         }
 800
 801         if(!scan)
 802         {
 803                 printf("MM_FreePtr: Block not found!");
 804                 return;
 805         }
 806
 807         last->next = scan->next;
 808
 809         MM_FreeBlock(scan, mm);
 810 }
 811 //==========================================================================
 812
 813 /*
 814 =====================
 815 =
 816 = MM_SetPurge
 817 =
 818 = Sets the purge level for a block (locked blocks cannot be made purgable)
 819 =
 820 =====================
 821 */
 822
 823 void MM_SetPurge(memptr *baseptr, int purge, mminfo_t *mm)
 824 {
 825         mmblocktype huge *start;
 826
 827         start = mm->mmrover;
 828
 829         do
 830         {
 831                 if(mm->mmrover->useptr == baseptr)
 832                         break;
 833
 834                 mm->mmrover = mm->mmrover->next;
 835
 836                 if(!mm->mmrover)
 837                         mm->mmrover = mm->mmhead;
 838                 else if(mm->mmrover == start)
 839                 {
 840                         printf("MM_SetPurge: Block not found!");
 841                         return;
 842                 }
 843
 844         } while(1);
 845
 846         mm->mmrover->attributes &= ~PURGEBITS;
 847         mm->mmrover->attributes |= purge;
 848 }
 849
 850 //==========================================================================
 851
 852 /*
 853 =====================
 854 =
 855 = MM_SetLock
 856 =
 857 = Locks / unlocks the block
 858 =
 859 =====================
 860 */
 861
 862 void MM_SetLock(memptr *baseptr, boolean locked, mminfo_t *mm)
 863 {
 864         mmblocktype huge *start;
 865
 866         start = mm->mmrover;
 867
 868         do
 869         {
 870                 if(mm->mmrover->useptr == baseptr)
 871                         break;
 872
 873                 mm->mmrover = mm->mmrover->next;
 874
 875                 if(!mm->mmrover)
 876                         mm->mmrover = mm->mmhead;
 877                 else if(mm->mmrover == start)
 878                 {
 879                         printf("MM_SetLock: Block not found!");
 880                         return;
 881                 }
 882
 883         } while(1);
 884
 885         mm->mmrover->attributes &= ~LOCKBIT;
 886         mm->mmrover->attributes |= locked*LOCKBIT;
 887 }
 888
 889 //==========================================================================
 890
 891 /*
 892 =====================
 893 =
 894 = MM_SortMem
 895 =
 896 = Throws out all purgable stuff and compresses movable blocks
 897 =
 898 =====================
 899 */
 900
 901 void MM_SortMem(mminfo_t *mm)
 902 {
 903         mmblocktype huge *scan,huge *last,huge *next;
 904         unsigned        start,length,source,dest,oldborder;
 905         int                     playing;
 906
 907         //
 908         // lock down a currently playing sound
 909         //
 910 /*++++  playing = SD_SoundPlaying ();
 911         if(playing)
 912         {
 913                 switch (SoundMode)
 914                 {
 915                 case sdm_PC:
 916                         playing += STARTPCSOUNDS;
 917                         break;
 918                 case sdm_AdLib:
 919                         playing += STARTADLIBSOUNDS;
 920                         break;
 921                 }
 922                 MM_SetLock(&(memptr)audiosegs[playing],true);
 923         }
 924
 925
 926         SD_StopSound();*/
 927 //      oldborder = bordercolor;
 928 //      VW_ColorBorder (15);
 929
 930         if(beforesort)
 931                 beforesort();
 932
 933         scan = mm->mmhead;
 934
 935         last = NULL;            // shut up compiler warning
 936
 937         while(scan)
 938         {
 939                 if(scan->attributes & LOCKBIT)
 940                 {
 941                 //
 942                 // block is locked, so try to pile later blocks right after it
 943                 //
 944                         start = scan->start + scan->length;
 945                 }
 946                 else
 947                 {
 948                         if(scan->attributes & PURGEBITS)
 949                         {
 950                         //
 951                         // throw out the purgable block
 952                         //
 953                                 next = scan->next;
 954                                 MM_FreeBlock(scan, mm);
 955                                 last->next = next;
 956                                 scan = next;
 957                                 continue;
 958                         }
 959                         else
 960                         {
 961                         //
 962                         // push the non purgable block on top of the last moved block
 963                         //
 964                                 if(scan->start != start)
 965                                 {
 966                                         length = scan->length;
 967                                         source = scan->start;
 968                                         dest = start;
 969                                         while(length > 0xf00)
 970                                         {
 971                                                 movedata(source,0,dest,0,0xf00*16);
 972                                                 length -= 0xf00;
 973                                                 source += 0xf00;
 974                                                 dest += 0xf00;
 975                                         }
 976                                         movedata(source,0,dest,0,length*16);
 977
 978                                         scan->start = start;
 979                                         *(unsigned *)scan->useptr = start;
 980                                 }
 981                                 start = scan->start + scan->length;
 982                         }
 983                 }
 984
 985                 last = scan;
 986                 scan = scan->next;              // go to next block
 987         }
 988
 989         mm->mmrover = mm->mmhead;
 990
 991         if(aftersort)
 992                 aftersort();
 993
 994 //      VW_ColorBorder (oldborder);
 995
 996 /*++++  if(playing)
 997                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
 998 }
 999
1000
1001 //==========================================================================
1002
1003 //****#if 0
1004 /*
1005 =====================
1006 =
1007 = MM_ShowMemory
1008 =
1009 =====================
1010 */
1011
1012 void MM_ShowMemory(mminfo_t *mm)
1013 {
1014         mmblocktype huge *scan;
1015         unsigned color,temp;//, i;
1016         long    end,owner;
1017         char    scratch[80],str[10];
1018
1019 //****  VW_SetDefaultColors();
1020 //****  VW_SetLineWidth(40);
1021 //++++mh        temp = bufferofs;
1022 //++++mh        bufferofs = 0;
1023 //****  VW_SetScreen (0,0);
1024
1025         scan = mm->mmhead;
1026
1027         end = -1;
1028
1029 //CA_OpenDebug ();
1030
1031         while (scan)
1032         {
1033                 if(scan->attributes & PURGEBITS)
1034                         color = 5;              // dark purple = purgable
1035                 else
1036                         color = 9;              // medium blue = non purgable
1037                 if(scan->attributes & LOCKBIT)
1038                         color = 12;             // red = locked
1039                 if(scan->start<=end)
1040                 {
1041                         printf("MM_ShowMemory: Memory block order currupted!");
1042                         return;
1043                 }
1044                 end = scan->start+scan->length-1;
1045 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1046 //++++          VW_Plot(scan->start,0,15);
1047                 if(scan->next->start > end+1)
1048 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1049
1050 //****#if 0
1051 printf("Location:");
1052 printf("%x\t", scan->start);
1053 strcpy (scratch,"Size:");
1054 ltoa ((dword)scan->length*16,str,10);
1055 strcat (scratch,str);
1056 strcat (scratch,"\tOwner:0x");
1057 owner = (unsigned)scan->useptr;
1058 ultoa (owner,str,16);
1059 strcat (scratch,str);
1060 strcat (scratch,"\n");
1061 //++++write (debughandle,scratch,strlen(scratch));
1062 fprintf(stdout, "%s", scratch);
1063 //****#endif
1064
1065                 scan = scan->next;
1066         }
1067
1068 //CA_CloseDebug ();
1069
1070 //++++mh        IN_Ack();
1071 //****  VW_SetLineWidth(64);
1072 //++++mh        bufferofs = temp;
1073 }
1074 //****#endif
1075
1076 //==========================================================================
1077
1078
1079 /*
1080 ======================
1081 =
1082 = MM_UnusedMemory
1083 =
1084 = Returns the total free space without purging
1085 =
1086 ======================
1087 */
1088
1089 dword MM_UnusedMemory(mminfo_t *mm)
1090 {
1091         dword free;
1092         mmblocktype huge *scan;
1093
1094         free = 0;
1095         scan = mm->mmhead;
1096
1097         while(scan->next)
1098         {
1099                 free += scan->next->start - (scan->start + scan->length);
1100                 scan = scan->next;
1101         }
1102
1103         return free*16l;
1104 //      return free;
1105 }
1106
1107 //==========================================================================
1108
1109
1110 /*
1111 ======================
1112 =
1113 = MM_TotalFree
1114 =
1115 = Returns the total free space with purging
1116 =
1117 ======================
1118 */
1119
1120 dword MM_TotalFree(mminfo_t *mm)
1121 {
1122         dword free;
1123         mmblocktype huge *scan;
1124
1125         free = 0;
1126         scan = mm->mmhead;
1127
1128         while(scan->next)
1129         {
1130                 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1131                         free += scan->length;
1132                 free += scan->next->start - (scan->start + scan->length);
1133                 scan = scan->next;
1134         }
1135
1136         return free*16l;
1137 //      return free;
1138 }
1139
1140 //==========================================================================
1141
1142 /*
1143 =====================
1144 =
1145 = MM_Report
1146 =
1147 =====================
1148 */
1149
1150 void MM_Report(mminfo_t *mm, mminfotype *mmi)
1151 {
1152         if(MML_CheckForEMS())
1153         {
1154                 printf("EMM %x available\n", mm->EMSVer);
1155                 printf("totalEMSpages=%u\n", mm->totalEMSpages);
1156                 printf("freeEMSpages=%u\n", mm->freeEMSpages);
1157                 printf("EMSpageframe=%x\n", mm->EMSpageframe);
1158         }
1159         if(MML_CheckForXMS(mm)) printf("XMSaddr=%x\n", *XMSaddr);
1160         printf("near=%lu\n", mmi->nearheap);
1161         printf("far=%lu\n", mmi->farheap);
1162         printf("EMSmem=%lu\n", mmi->EMSmem);
1163         printf("XMSmem=%lu\n", mmi->XMSmem);
1164         printf("mainmem=%lu\n", mmi->mainmem);
1165         printf("UnusedMemory=%lu\n", MM_UnusedMemory(mm));
1166         printf("TotalFree=%lu\n", MM_TotalFree(mm));
1167 //      printf("\n");
1168 //      printf("UnusedMemory=%lu kb\n", MM_UnusedMemory()/10248);
1169 //      printf("TotalFree=%lu kb\n", MM_TotalFree()/10248);
1170 }
1171
1172 //==========================================================================
1173
1174 /*
1175 =====================
1176 =
1177 = MM_EMSVer
1178 =
1179 =====================
1180
1181
1182 int MM_EMSVer(void)
1183 {
1184         int EMSver;
1185         __asm
1186         {
1187                 mov             ah,EMS_VERSION
1188                 int             EMS_INT
1189                 mov             EMSver,ax
1190         }
1191         return(EMSver);
1192 }*/
1193
1194 //==========================================================================
1195
1196 /*
1197 =====================
1198 =
1199 = MM_BombOnError
1200 =
1201 =====================
1202 */
1203
1204 void MM_BombOnError(boolean bomb, mminfo_t *mm)
1205 {
1206         mm->bombonerror = bomb;
1207 }
1208
1209 void MM_GetNewBlock(mminfo_t *mm)
1210 {
1211         if(!mm->mmfree)
1212                 MML_ClearBlock(mm);
1213         mm->mmnew=mm->mmfree;
1214         mm->mmfree=mm->mmfree->next;
1215         /*if(!(mm->mmnew=mm->mmfree))
1216         {
1217                 printf("MM_GETNEWBLOCK: No free blocks!");
1218                 return;
1219         }
1220         mm->mmfree=mm->mmfree->next;*/
1221 }
1222
1223 void MM_FreeBlock(mmblocktype *x, mminfo_t *mm)
1224 {
1225         x->useptr=NULL;
1226         x->next=mm->mmfree;
1227         mm->mmfree=x;
1228 }