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
 178                 cmp     bx,4
 179                 jle     getpages                                        // there is only 1,2,3,or 4 pages
 180                 mov     bx,4                                            // we can't use more than 4 pages
 181
 182 getpages:
 183                 mov     [EMSpagesmapped],bx
 184                 mov     ah,EMS_ALLOCPAGES                       // allocate up to 64k of EMS
 185                 int     EMS_INT
 186                 or      ah,ah
 187                 jnz     error
 188                 mov     [EMShandle],dx
 189                 jmp End
 190 error:
 191                 mov     errorflag,1
 192                 jmp End
 193 noEMS:
 194 End:
 195         }
 196         if(errorflag==true)
 197         {
 198                 err = CPURegs.h.ah;
 199                 strcpy(str,"MML_SetupEMS: EMS error 0x");
 200                 itoa(err,str2,16);
 201                 strcpy(str,str2);
 202                 printf("%s\n",str);
 203                 return err;
 204         }
 205         mm->totalEMSpages=totalEMSpages;
 206         mm->freeEMSpages=freeEMSpages;
 207         mm->EMSpageframe=EMSpageframe;
 208         mm->EMSpagesmapped=EMSpagesmapped;
 209         mm->EMShandle=EMShandle;
 210         mm->EMSVer=EMSVer;
 211         return 0;
 212 }
 213
 214
 215 /*
 216 ======================
 217 =
 218 = MML_ShutdownEMS
 219 =
 220 =======================
 221 */
 222
 223 void MML_ShutdownEMS(mminfo_t *mm)
 224 {
 225         boolean errorflag=false;
 226         unsigned EMShandle=mm->EMShandle;
 227
 228         if(!EMShandle)
 229                 return;
 230         __asm
 231         {
 232                 mov     ah,EMS_FREEPAGES
 233                 mov     dx,[EMShandle]
 234                 int     EMS_INT
 235                 or      ah,ah
 236                 jz      ok
 237                 mov     errorflag,1
 238                 ok:
 239         }
 240         if(errorflag==true) printf("MML_ShutdownEMS: Error freeing EMS!");      //++++ add something
 241 }
 242
 243 /*
 244 ====================
 245 =
 246 = MM_MapEMS
 247 =
 248 = Maps the 64k of EMS used by memory manager into the page frame
 249 = for general use.  This only needs to be called if you are keeping
 250 = other things in EMS.
 251 =
 252 ====================
 253 */
 254
 255 unsigned MM_MapEMS(mminfo_t *mm)
 256 {
 257         char    str[80],str2[10];
 258         unsigned        err, EMShandle;
 259         boolean errorflag=false;
 260         int     i;
 261         union REGS CPURegs;
 262         EMShandle=mm->EMShandle;
 263
 264         for (i=0;i<mm->EMSpagesmapped;i++)
 265         {
 266                 __asm
 267                 {
 268                         mov     ah,EMS_MAPPAGE
 269                         mov     bx,[i]                  // logical page
 270                         mov     al,bl                   // physical page
 271                         mov     dx,[EMShandle]  // handle
 272                         int     EMS_INT
 273                         or      ah,ah
 274                         jnz     error
 275                         jmp End
 276                         error:
 277                         mov     errorflag,1
 278                         End:
 279                 }
 280                 if(errorflag==true)
 281                 {
 282                         err = CPURegs.h.ah;
 283                         strcpy(str,"MM_MapEMS: EMS error 0x");
 284                         itoa(err,str2,16);
 285                         strcpy(str,str2);
 286                         printf("%s\n",str);
 287                         return err;
 288                 }
 289         }
 290         return 0;
 291 }
 292
 293 //==========================================================================
 294
 295 /*
 296 ======================
 297 =
 298 = MML_CheckForXMS
 299 =
 300 = Check for XMM driver
 301 =
 302 =======================
 303 */
 304
 305 boolean MML_CheckForXMS(mminfo_t *mm)
 306 {
 307         boolean errorflag=false;
 308         mm->numUMBs = 0;
 309
 310         __asm
 311         {
 312                 mov     ax,0x4300
 313                 int     0x2f                            // query status of installed diver
 314                 cmp     al,0x80
 315                 je      good
 316                 mov     errorflag,1
 317                 good:
 318         }
 319         if(errorflag==true) return false;
 320         else return true;
 321 }
 322
 323
 324 /*
 325 ======================
 326 =
 327 = MML_SetupXMS
 328 =
 329 = Try to allocate all upper memory block
 330 =
 331 =======================
 332 */
 333
 334 void MML_SetupXMS(mminfo_t *mm, mminfotype *mmi)
 335 {
 336         unsigned        base,size;
 337
 338         __asm
 339         {
 340                 mov     ax,0x4310
 341                 int     0x2f
 342                 mov     [WORD PTR XMSaddr],bx
 343                 mov     [WORD PTR XMSaddr+2],es         // function pointer to XMS driver
 344         }
 345 getmemory:
 346         __asm
 347         {
 348                 mov     ah,XMS_ALLOCUMB
 349                 mov     dx,0xffff                                       // try for largest block possible
 350                 call    [DWORD PTR XMSaddr]
 351                 or      ax,ax
 352                 jnz     gotone
 353
 354                 cmp     bl,0xb0                                         // error: smaller UMB is available
 355                 jne     done;
 356
 357                 mov     ah,XMS_ALLOCUMB
 358                 call    [DWORD PTR XMSaddr]             // DX holds largest available UMB
 359                 or      ax,ax
 360                 jz      done                                            // another error...
 361
 362 gotone:
 363                 mov     [base],bx
 364                 mov     [size],dx
 365 done:
 366         }
 367         MML_UseSpace(base,size, mm);
 368         mmi->XMSmem += size*16;
 369         mm->UMBbase[mm->numUMBs] = base;
 370         mm->numUMBs++;
 371         if(mm->numUMBs < MAXUMBS)
 372                 goto getmemory;
 373 }
 374
 375
 376 /*
 377 ======================
 378 =
 379 = MML_ShutdownXMS
 380 =
 381 ======================
 382 */
 383
 384 void MML_ShutdownXMS(mminfo_t *mm)
 385 {
 386         int     i;
 387         unsigned        base;
 388
 389         for (i=0;i<mm->numUMBs;i++)
 390         {
 391                 base = mm->UMBbase[i];
 392                 __asm
 393                 {
 394                         mov     ah,XMS_FREEUMB
 395                         mov     dx,[base]
 396                         call    [DWORD PTR XMSaddr]
 397                 }
 398         }
 399 }
 400
 401 //==========================================================================
 402
 403 /*
 404 ======================
 405 =
 406 = MML_UseSpace
 407 =
 408 = Marks a range of paragraphs as usable by the memory manager
 409 = This is used to mark space for the near heap, far heap, ems page frame,
 410 = and upper memory blocks
 411 =
 412 ======================
 413 */
 414
 415 void MML_UseSpace(unsigned segstart, unsigned seglength, mminfo_t *mm)
 416 {
 417         mmblocktype huge *scan,huge *last;
 418         unsigned        oldend;
 419         //++++if(mm->EMSVer)
 420         long            extra;
 421
 422         scan = last = mm->mmhead;
 423         mm->mmrover = mm->mmhead;               // reset rover to start of memory
 424
 425 //
 426 // search for the block that contains the range of segments
 427 //
 428         while(scan->start+scan->length < segstart)
 429         {
 430                 last = scan;
 431                 scan = scan->next;
 432         }
 433
 434 //
 435 // take the given range out of the block
 436 //
 437         oldend = scan->start + scan->length;
 438         extra = oldend - (segstart+seglength);
 439         if(extra < 0)
 440         {
 441                 printf("MML_UseSpace: Segment spans two blocks!");
 442                 return;
 443         }
 444
 445
 446         if(segstart == scan->start)
 447         {
 448                 last->next = scan->next;                        // unlink block
 449                 MM_FreeBlock(scan, mm);
 450                 scan = last;
 451         }
 452         else
 453                 scan->length = segstart-scan->start;    // shorten block
 454
 455         if(extra > 0)
 456         {
 457                 MM_GetNewBlock(mm);
 458                 mm->mmnew->next = scan->next;
 459                 scan->next = mm->mmnew;
 460                 mm->mmnew->start = segstart+seglength;
 461                 mm->mmnew->length = extra;
 462                 mm->mmnew->attributes = LOCKBIT;
 463         }
 464
 465 }
 466
 467 //==========================================================================
 468
 469 /*
 470 ====================
 471 =
 472 = MML_ClearBlock
 473 =
 474 = We are out of blocks, so free a purgable block
 475 =
 476 ====================
 477 */
 478
 479 void MML_ClearBlock(mminfo_t *mm)
 480 {
 481         mmblocktype huge *scan,huge *last;
 482
 483         scan = mm->mmhead->next;
 484
 485         while(scan)
 486         {
 487                 if(!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS))
 488                 {
 489                         MM_FreePtr(scan->useptr, mm);
 490                         return;
 491                 }
 492                 scan = scan->next;
 493         }
 494
 495         printf("MM_ClearBlock: No purgable blocks!");
 496 }
 497
 498
 499 //==========================================================================
 500
 501 /*
 502 ===================
 503 =
 504 = MM_Startup
 505 =
 506 = Grabs all space from turbo with malloc/farmalloc
 507 = Allocates bufferseg misc buffer
 508 =
 509 ===================
 510 */
 511
 512 void MM_Startup(mminfo_t *mm, mminfotype *mmi)
 513 {
 514         int i;
 515         dword length;
 516         void huge       *start;
 517         unsigned        segstart,seglength,endfree;
 518
 519         if(mm->mmstarted)
 520                 MM_Shutdown(mm);
 521
 522         mm->mmstarted = true;
 523         mm->bombonerror = true;
 524 //
 525 // set up the linked list (everything in the free list;
 526 //
 527         mm->mmhead = NULL;
 528         mm->mmfree = &(mm->mmblocks[0]);
 529         for(i=0;i<MAXBLOCKS-1;i++)
 530         {
 531                 mm->mmblocks[i].next = &(mm->mmblocks[i+1]);
 532         }
 533         mm->mmblocks[i].next = NULL;
 534
 535 //
 536 // locked block of all memory until we punch out free space
 537 //
 538         MM_GetNewBlock(mm);
 539         mm->mmhead = mm->mmnew;                         // this will allways be the first node
 540         mm->mmnew->start = 0;
 541         mm->mmnew->length = 0xffff;
 542         mm->mmnew->attributes = LOCKBIT;
 543         mm->mmnew->next = NULL;
 544         mm->mmrover = mm->mmhead;
 545
 546
 547 //
 548 // get all available near conventional memory segments
 549 //
 550 //----  length=coreleft();
 551         _nheapgrow();
 552         length=_memavl();
 553         start = (void huge *)(mm->nearheap = malloc(length));
 554
 555         length -= 16-(FP_OFF(start)&15);
 556         length -= SAVENEARHEAP;
 557         seglength = length / 16;                        // now in paragraphs
 558         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 559         MML_UseSpace(segstart,seglength, mm);
 560         mmi->nearheap = length;
 561
 562 //
 563 // get all available far conventional memory segments
 564 //
 565 //----  length=farcoreleft();
 566         _fheapgrow();
 567         length=_memavl();
 568         start = mm->farheap = halloc(length, 1);
 569         //start = mm->farheap = _fmalloc(length);
 570         length -= 16-(FP_OFF(start)&15);
 571         length -= SAVEFARHEAP;
 572         seglength = length / 16;                        // now in paragraphs
 573         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 574         MML_UseSpace(segstart,seglength, mm);
 575         mmi->farheap = length;
 576         mmi->mainmem = mmi->nearheap + mmi->farheap;
 577
 578
 579 //
 580 // detect EMS and allocate up to 64K at page frame
 581 //
 582         mmi->EMSmem = 0;
 583         for(i = 1;i < __argc;i++)
 584         {
 585                 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 586                         goto emsskip;                           // param NOEMS
 587         }
 588         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!
 589         if(MML_CheckForEMS())
 590         {
 591 //printf("EMS1\n");
 592                 MML_SetupEMS(mm);                                       // allocate space
 593                 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!
 594                 MML_UseSpace(mm->EMSpageframe,mm->EMSpagesmapped*0x400, mm);
 595 //printf("EMS3\n");
 596                 MM_MapEMS(mm);                                  // map in used pages
 597 //printf("EMS4\n");
 598                 mmi->EMSmem = mm->EMSpagesmapped*0x4000l;
 599         }
 600
 601 //
 602 // detect XMS and get upper memory blocks
 603 //
 604 emsskip:
 605         mmi->XMSmem = 0;
 606         for(i = 1;i < __argc;i++)
 607         {
 608                 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 609                         goto xmsskip;                           // param NOXMS
 610         }
 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         if(MML_CheckForXMS(mm))
 613         {
 614 //printf("XMS!\n");
 615                 MML_SetupXMS(mm, mmi);                                  // allocate as many UMBs as possible
 616         }
 617
 618 //
 619 // allocate the misc buffer
 620 //
 621 xmsskip:
 622         mm->mmrover = mm->mmhead;               // start looking for space after low block
 623
 624         MM_GetPtr(&(mm->bufferseg),BUFFERSIZE, mm, mmi);
 625 }
 626
 627 //==========================================================================
 628
 629 /*
 630 ====================
 631 =
 632 = MM_Shutdown
 633 =
 634 = Frees all conventional, EMS, and XMS allocated
 635 =
 636 ====================
 637 */
 638
 639 void MM_Shutdown(mminfo_t *mm)
 640 {
 641         if(!(mm->mmstarted))
 642                 return;
 643
 644         _ffree(mm->farheap);
 645         printf("far freed\n");
 646         free(mm->nearheap);
 647         printf("near freed\n");
 648         //hfree(mm->hugeheap);
 649         //printf("huge freed\n");
 650         if(MML_CheckForEMS()){ MML_ShutdownEMS(mm); printf("EMS freed\n"); }
 651         if(MML_CheckForXMS(mm)){ MML_ShutdownXMS(mm); printf("XMS freed\n"); }
 652 }
 653
 654 //==========================================================================
 655
 656 /*
 657 ====================
 658 =
 659 = MM_GetPtr
 660 =
 661 = Allocates an unlocked, unpurgable block
 662 =
 663 ====================
 664 */
 665
 666 void MM_GetPtr(memptr *baseptr,dword size, mminfo_t *mm, mminfotype *mmi)
 667 {
 668         mmblocktype huge *scan,huge *lastscan,huge *endscan
 669                                 ,huge *purge,huge *next;
 670         int                     search;
 671         unsigned        needed,startseg;
 672
 673         needed = (size+15)/16;          // convert size from bytes to paragraphs
 674
 675         MM_GetNewBlock(mm);                             // fill in start and next after a spot is found
 676         mm->mmnew->length = needed;
 677         mm->mmnew->useptr = baseptr;
 678         mm->mmnew->attributes = BASEATTRIBUTES;
 679
 680         for(search = 0; search<3; search++)
 681         {
 682         //
 683         // first search:        try to allocate right after the rover, then on up
 684         // second search:       search from the head pointer up to the rover
 685         // third search:        compress memory, then scan from start
 686                 if(search == 1 && mm->mmrover == mm->mmhead)
 687                         search++;
 688
 689                 switch(search)
 690                 {
 691                 case 0:
 692                         lastscan = mm->mmrover;
 693                         scan = mm->mmrover->next;
 694                         endscan = NULL;
 695                         break;
 696                 case 1:
 697                         lastscan = mm->mmhead;
 698                         scan = mm->mmhead->next;
 699                         endscan = mm->mmrover;
 700                         break;
 701                 case 2:
 702                         MM_SortMem(mm);
 703                         lastscan = mm->mmhead;
 704                         scan = mm->mmhead->next;
 705                         endscan = NULL;
 706                         break;
 707                 }
 708
 709                 startseg = lastscan->start + lastscan->length;
 710
 711                 while(scan != endscan)
 712                 {
 713                         if(scan->start - startseg >= needed)
 714                         {
 715                         //
 716                         // got enough space between the end of lastscan and
 717                         // the start of scan, so throw out anything in the middle
 718                         // and allocate the new block
 719                         //
 720                                 purge = lastscan->next;
 721                                 lastscan->next = mm->mmnew;
 722                                 mm->mmnew->start = *(unsigned *)baseptr = startseg;
 723                                 mm->mmnew->next = scan;
 724                                 while(purge != scan)
 725                                 {       // free the purgable block
 726                                         next = purge->next;
 727                                         MM_FreeBlock(purge, mm);
 728                                         purge = next;           // purge another if not at scan
 729                                 }
 730                                 mm->mmrover = mm->mmnew;
 731                                 return; // good allocation!
 732                         }
 733
 734                         //
 735                         // if this block is purge level zero or locked, skip past it
 736                         //
 737                         if((scan->attributes & LOCKBIT)
 738                                 || !(scan->attributes & PURGEBITS) )
 739                         {
 740                                 lastscan = scan;
 741                                 startseg = lastscan->start + lastscan->length;
 742                         }
 743
 744
 745                         scan=scan->next;                // look at next line
 746                 }
 747         }
 748
 749         if (mm->bombonerror)
 750                 printf(OUT_OF_MEM_MSG,(size-mmi->nearheap));
 751         else
 752                 mm->mmerror = true;
 753 }
 754
 755 //==========================================================================
 756
 757 /*
 758 ====================
 759 =
 760 = MM_FreePtr
 761 =
 762 = Allocates an unlocked, unpurgable block
 763 =
 764 ====================
 765 */
 766
 767 void MM_FreePtr(memptr *baseptr, mminfo_t *mm)
 768 {
 769         mmblocktype huge *scan,huge *last;
 770
 771         last = mm->mmhead;
 772         scan = last->next;
 773
 774         if(baseptr == mm->mmrover->useptr)      // removed the last allocated block
 775                 mm->mmrover = mm->mmhead;
 776
 777         while(scan->useptr != baseptr && scan)
 778         {
 779                 last = scan;
 780                 scan = scan->next;
 781         }
 782
 783         if(!scan)
 784         {
 785                 printf("MM_FreePtr: Block not found!");
 786                 return;
 787         }
 788
 789         last->next = scan->next;
 790
 791         MM_FreeBlock(scan, mm);
 792 }
 793 //==========================================================================
 794
 795 /*
 796 =====================
 797 =
 798 = MM_SetPurge
 799 =
 800 = Sets the purge level for a block (locked blocks cannot be made purgable)
 801 =
 802 =====================
 803 */
 804
 805 void MM_SetPurge(memptr *baseptr, int purge, mminfo_t *mm)
 806 {
 807         mmblocktype huge *start;
 808
 809         start = mm->mmrover;
 810
 811         do
 812         {
 813                 if(mm->mmrover->useptr == baseptr)
 814                         break;
 815
 816                 mm->mmrover = mm->mmrover->next;
 817
 818                 if(!mm->mmrover)
 819                         mm->mmrover = mm->mmhead;
 820                 else if(mm->mmrover == start)
 821                 {
 822                         printf("MM_SetPurge: Block not found!");
 823                         return;
 824                 }
 825
 826         } while(1);
 827
 828         mm->mmrover->attributes &= ~PURGEBITS;
 829         mm->mmrover->attributes |= purge;
 830 }
 831
 832 //==========================================================================
 833
 834 /*
 835 =====================
 836 =
 837 = MM_SetLock
 838 =
 839 = Locks / unlocks the block
 840 =
 841 =====================
 842 */
 843
 844 void MM_SetLock(memptr *baseptr, boolean locked, mminfo_t *mm)
 845 {
 846         mmblocktype huge *start;
 847
 848         start = mm->mmrover;
 849
 850         do
 851         {
 852                 if(mm->mmrover->useptr == baseptr)
 853                         break;
 854
 855                 mm->mmrover = mm->mmrover->next;
 856
 857                 if(!mm->mmrover)
 858                         mm->mmrover = mm->mmhead;
 859                 else if(mm->mmrover == start)
 860                 {
 861                         printf("MM_SetLock: Block not found!");
 862                         return;
 863                 }
 864
 865         } while(1);
 866
 867         mm->mmrover->attributes &= ~LOCKBIT;
 868         mm->mmrover->attributes |= locked*LOCKBIT;
 869 }
 870
 871 //==========================================================================
 872
 873 /*
 874 =====================
 875 =
 876 = MM_SortMem
 877 =
 878 = Throws out all purgable stuff and compresses movable blocks
 879 =
 880 =====================
 881 */
 882
 883 void MM_SortMem(mminfo_t *mm)
 884 {
 885         mmblocktype huge *scan,huge *last,huge *next;
 886         unsigned        start,length,source,dest,oldborder;
 887         int                     playing;
 888
 889         //
 890         // lock down a currently playing sound
 891         //
 892 /*++++  playing = SD_SoundPlaying ();
 893         if(playing)
 894         {
 895                 switch (SoundMode)
 896                 {
 897                 case sdm_PC:
 898                         playing += STARTPCSOUNDS;
 899                         break;
 900                 case sdm_AdLib:
 901                         playing += STARTADLIBSOUNDS;
 902                         break;
 903                 }
 904                 MM_SetLock(&(memptr)audiosegs[playing],true);
 905         }
 906
 907
 908         SD_StopSound();*/
 909 //      oldborder = bordercolor;
 910 //      VW_ColorBorder (15);
 911
 912         if(beforesort)
 913                 beforesort();
 914
 915         scan = mm->mmhead;
 916
 917         last = NULL;            // shut up compiler warning
 918
 919         while(scan)
 920         {
 921                 if(scan->attributes & LOCKBIT)
 922                 {
 923                 //
 924                 // block is locked, so try to pile later blocks right after it
 925                 //
 926                         start = scan->start + scan->length;
 927                 }
 928                 else
 929                 {
 930                         if(scan->attributes & PURGEBITS)
 931                         {
 932                         //
 933                         // throw out the purgable block
 934                         //
 935                                 next = scan->next;
 936                                 MM_FreeBlock(scan, mm);
 937                                 last->next = next;
 938                                 scan = next;
 939                                 continue;
 940                         }
 941                         else
 942                         {
 943                         //
 944                         // push the non purgable block on top of the last moved block
 945                         //
 946                                 if(scan->start != start)
 947                                 {
 948                                         length = scan->length;
 949                                         source = scan->start;
 950                                         dest = start;
 951                                         while(length > 0xf00)
 952                                         {
 953                                                 movedata(source,0,dest,0,0xf00*16);
 954                                                 length -= 0xf00;
 955                                                 source += 0xf00;
 956                                                 dest += 0xf00;
 957                                         }
 958                                         movedata(source,0,dest,0,length*16);
 959
 960                                         scan->start = start;
 961                                         *(unsigned *)scan->useptr = start;
 962                                 }
 963                                 start = scan->start + scan->length;
 964                         }
 965                 }
 966
 967                 last = scan;
 968                 scan = scan->next;              // go to next block
 969         }
 970
 971         mm->mmrover = mm->mmhead;
 972
 973         if(aftersort)
 974                 aftersort();
 975
 976 //      VW_ColorBorder (oldborder);
 977
 978 /*++++  if(playing)
 979                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
 980 }
 981
 982
 983 //==========================================================================
 984
 985 //****#if 0
 986 /*
 987 =====================
 988 =
 989 = MM_ShowMemory
 990 =
 991 =====================
 992 */
 993
 994 void MM_ShowMemory(mminfo_t *mm)
 995 {
 996         mmblocktype huge *scan;
 997         unsigned color,temp;//, i;
 998         long    end,owner;
 999         char    scratch[80],str[10];
1000
1001 //****  VW_SetDefaultColors();
1002 //****  VW_SetLineWidth(40);
1003 //++++mh        temp = bufferofs;
1004 //++++mh        bufferofs = 0;
1005 //****  VW_SetScreen (0,0);
1006
1007         scan = mm->mmhead;
1008
1009         end = -1;
1010
1011 //CA_OpenDebug ();
1012
1013         while (scan)
1014         {
1015                 if(scan->attributes & PURGEBITS)
1016                         color = 5;              // dark purple = purgable
1017                 else
1018                         color = 9;              // medium blue = non purgable
1019                 if(scan->attributes & LOCKBIT)
1020                         color = 12;             // red = locked
1021                 if(scan->start<=end)
1022                 {
1023                         printf("MM_ShowMemory: Memory block order currupted!");
1024                         return;
1025                 }
1026                 end = scan->start+scan->length-1;
1027 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1028 //++++          VW_Plot(scan->start,0,15);
1029                 if(scan->next->start > end+1)
1030 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1031
1032 //****#if 0
1033 printf("Location:");
1034 printf("%x\t", scan->start);
1035 strcpy (scratch,"Size:");
1036 ltoa ((long)scan->length*16,str,10);
1037 strcat (scratch,str);
1038 strcat (scratch,"\tOwner:0x");
1039 owner = (unsigned)scan->useptr;
1040 ultoa (owner,str,16);
1041 strcat (scratch,str);
1042 strcat (scratch,"\n");
1043 //++++write (debughandle,scratch,strlen(scratch));
1044 fprintf(stdout, "%s", scratch);
1045 //****#endif
1046
1047                 scan = scan->next;
1048         }
1049
1050 //CA_CloseDebug ();
1051
1052 //++++mh        IN_Ack();
1053 //****  VW_SetLineWidth(64);
1054 //++++mh        bufferofs = temp;
1055 }
1056 //****#endif
1057
1058 //==========================================================================
1059
1060
1061 /*
1062 ======================
1063 =
1064 = MM_UnusedMemory
1065 =
1066 = Returns the total free space without purging
1067 =
1068 ======================
1069 */
1070
1071 dword MM_UnusedMemory(mminfo_t *mm)
1072 {
1073         unsigned free;
1074         mmblocktype huge *scan;
1075
1076         free = 0;
1077         scan = mm->mmhead;
1078
1079         while(scan->next)
1080         {
1081                 free += scan->next->start - (scan->start + scan->length);
1082                 scan = scan->next;
1083         }
1084
1085         return free*16l;
1086 //      return free;
1087 }
1088
1089 //==========================================================================
1090
1091
1092 /*
1093 ======================
1094 =
1095 = MM_TotalFree
1096 =
1097 = Returns the total free space with purging
1098 =
1099 ======================
1100 */
1101
1102 dword MM_TotalFree(mminfo_t *mm)
1103 {
1104         unsigned free;
1105         mmblocktype huge *scan;
1106
1107         free = 0;
1108         scan = mm->mmhead;
1109
1110         while(scan->next)
1111         {
1112                 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1113                         free += scan->length;
1114                 free += scan->next->start - (scan->start + scan->length);
1115                 scan = scan->next;
1116         }
1117
1118         return free*16l;
1119 //      return free;
1120 }
1121
1122 //==========================================================================
1123
1124 /*
1125 =====================
1126 =
1127 = MM_Report
1128 =
1129 =====================
1130 */
1131
1132 void MM_Report(mminfo_t *mm, mminfotype *mmi)
1133 {
1134         if(MML_CheckForEMS())
1135         {
1136                 printf("EMM %x available\n", mm->EMSVer);
1137                 printf("totalEMSpages=%u\n", mm->totalEMSpages);
1138                 printf("freeEMSpages=%u\n", mm->freeEMSpages);
1139                 printf("EMSpageframe=%Fp\n", mm->EMSpageframe);
1140         }
1141         printf("near=%lu\n", mmi->nearheap);
1142         printf("far=%lu\n", mmi->farheap);
1143         printf("EMSmem=%lu\n", mmi->EMSmem);
1144         printf("XMSmem=%lu\n", mmi->XMSmem);
1145         printf("mainmem=%lu\n", mmi->mainmem);
1146         printf("UnusedMemory=%lu\n", MM_UnusedMemory(mm));
1147         printf("TotalFree=%lu\n", MM_TotalFree(mm));
1148 //      printf("\n");
1149 //      printf("UnusedMemory=%lu kb\n", MM_UnusedMemory()/10248);
1150 //      printf("TotalFree=%lu kb\n", MM_TotalFree()/10248);
1151 }
1152
1153 //==========================================================================
1154
1155 /*
1156 =====================
1157 =
1158 = MM_EMSVer
1159 =
1160 =====================
1161
1162
1163 int MM_EMSVer(void)
1164 {
1165         int EMSver;
1166         __asm
1167         {
1168                 mov             ah,EMS_VERSION
1169                 int             EMS_INT
1170                 mov             EMSver,ax
1171         }
1172         return(EMSver);
1173 }*/
1174
1175 //==========================================================================
1176
1177 /*
1178 =====================
1179 =
1180 = MM_BombOnError
1181 =
1182 =====================
1183 */
1184
1185 void MM_BombOnError(boolean bomb, mminfo_t *mm)
1186 {
1187         mm->bombonerror = bomb;
1188 }
1189
1190 void MM_GetNewBlock(mminfo_t *mm)
1191 {
1192         if(!mm->mmfree)
1193                 MML_ClearBlock(mm);
1194         mm->mmnew=mm->mmfree;
1195         mm->mmfree=mm->mmfree->next;
1196         /*if(!(mm->mmnew=mm->mmfree))
1197         {
1198                 printf("MM_GETNEWBLOCK: No free blocks!");
1199                 return;
1200         }
1201         mm->mmfree=mm->mmfree->next;*/
1202 }
1203
1204 void MM_FreeBlock(mmblocktype *x, mminfo_t *mm)
1205 {
1206         x->useptr=NULL;
1207         x->next=mm->mmfree;
1208         mm->mmfree=x;
1209 }