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 getmemory:
 339         __asm
 340         {
 341                 mov     ax,0x4310
 342                 int     0x2f
 343                 mov     [WORD PTR XMSaddr],bx
 344                 mov     [WORD PTR XMSaddr+2],es         // function pointer to XMS driver
 345
 346                 mov     ah,XMS_ALLOCUMB
 347                 mov     dx,0xffff                                       // try for largest block possible
 348                 call    [DWORD PTR XMSaddr]
 349                 or      ax,ax
 350                 jnz     gotone
 351
 352                 cmp     bl,0xb0                                         // error: smaller UMB is available
 353                 jne     done;
 354
 355                 mov     ah,XMS_ALLOCUMB
 356                 call    [DWORD PTR XMSaddr]             // DX holds largest available UMB
 357                 or      ax,ax
 358                 jz      done                                            // another error...
 359
 360 gotone:
 361                 mov     [base],bx
 362                 mov     [size],dx
 363 done:
 364         }
 365         MML_UseSpace(base,size, mm);
 366         mmi->XMSmem += size*16;
 367         mm->UMBbase[mm->numUMBs] = base;
 368         mm->numUMBs++;
 369         if(mm->numUMBs < MAXUMBS)
 370                 goto getmemory;
 371 }
 372
 373
 374 /*
 375 ======================
 376 =
 377 = MML_ShutdownXMS
 378 =
 379 ======================
 380 */
 381
 382 void MML_ShutdownXMS(mminfo_t *mm)
 383 {
 384         int     i;
 385         unsigned        base;
 386
 387         for (i=0;i<mm->numUMBs;i++)
 388         {
 389                 base = mm->UMBbase[i];
 390                 __asm
 391                 {
 392                         mov     ah,XMS_FREEUMB
 393                         mov     dx,[base]
 394                         call    [DWORD PTR XMSaddr]
 395                 }
 396         }
 397 }
 398
 399 //==========================================================================
 400
 401 /*
 402 ======================
 403 =
 404 = MML_UseSpace
 405 =
 406 = Marks a range of paragraphs as usable by the memory manager
 407 = This is used to mark space for the near heap, far heap, ems page frame,
 408 = and upper memory blocks
 409 =
 410 ======================
 411 */
 412
 413 void MML_UseSpace(unsigned segstart, unsigned seglength, mminfo_t *mm)
 414 {
 415         mmblocktype huge *scan,huge *last;
 416         unsigned        oldend;
 417         //++++if(mm->EMSVer)
 418         long            extra;
 419
 420         scan = last = mm->mmhead;
 421         mm->mmrover = mm->mmhead;               // reset rover to start of memory
 422
 423 //
 424 // search for the block that contains the range of segments
 425 //
 426         while(scan->start+scan->length < segstart)
 427         {
 428                 last = scan;
 429                 scan = scan->next;
 430         }
 431
 432 //
 433 // take the given range out of the block
 434 //
 435         oldend = scan->start + scan->length;
 436         extra = oldend - (segstart+seglength);
 437         //++++emsver stuff!
 438         if(extra < 0)
 439         {
 440                 printf("MML_UseSpace: Segment spans two blocks!");
 441                 return;
 442         }
 443
 444
 445         if(segstart == scan->start)
 446         {
 447                 last->next = scan->next;                        // unlink block
 448                 MM_FreeBlock(scan, mm);
 449                 scan = last;
 450         }
 451         else
 452                 scan->length = segstart-scan->start;    // shorten block
 453
 454         if(extra > 0)
 455         {
 456                 MM_GetNewBlock(mm);
 457                 mm->mmnew->next = scan->next;
 458                 scan->next = mm->mmnew;
 459                 mm->mmnew->start = segstart+seglength;
 460                 mm->mmnew->length = extra;
 461                 mm->mmnew->attributes = LOCKBIT;
 462         }
 463
 464 }
 465
 466 //==========================================================================
 467
 468 /*
 469 ====================
 470 =
 471 = MML_ClearBlock
 472 =
 473 = We are out of blocks, so free a purgable block
 474 =
 475 ====================
 476 */
 477
 478 void MML_ClearBlock(mminfo_t *mm)
 479 {
 480         mmblocktype huge *scan,huge *last;
 481
 482         scan = mm->mmhead->next;
 483
 484         while(scan)
 485         {
 486                 if(!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS))
 487                 {
 488                         MM_FreePtr(scan->useptr, mm);
 489                         return;
 490                 }
 491                 scan = scan->next;
 492         }
 493
 494         printf("MM_ClearBlock: No purgable blocks!");
 495 }
 496
 497
 498 //==========================================================================
 499
 500 /*
 501 ===================
 502 =
 503 = MM_Startup
 504 =
 505 = Grabs all space from turbo with malloc/farmalloc
 506 = Allocates bufferseg misc buffer
 507 =
 508 ===================
 509 */
 510
 511 void MM_Startup(mminfo_t *mm, mminfotype *mmi)
 512 {
 513         int i;
 514         dword length;
 515         void huge       *start;
 516         unsigned        segstart,seglength,endfree;
 517
 518         if(mm->mmstarted)
 519                 MM_Shutdown(mm);
 520
 521         mm->mmstarted = true;
 522         mm->bombonerror = true;
 523 //
 524 // set up the linked list (everything in the free list;
 525 //
 526         mm->mmhead = NULL;
 527         mm->mmfree = &(mm->mmblocks[0]);
 528         for(i=0;i<MAXBLOCKS-1;i++)
 529         {
 530                 mm->mmblocks[i].next = &(mm->mmblocks[i+1]);
 531         }
 532         mm->mmblocks[i].next = NULL;
 533
 534 //
 535 // locked block of all memory until we punch out free space
 536 //
 537         MM_GetNewBlock(mm);
 538         mm->mmhead = mm->mmnew;                         // this will allways be the first node
 539         mm->mmnew->start = 0;
 540         mm->mmnew->length = 0xffff;
 541         mm->mmnew->attributes = LOCKBIT;
 542         mm->mmnew->next = NULL;
 543         mm->mmrover = mm->mmhead;
 544
 545
 546 //
 547 // get all available near conventional memory segments
 548 //
 549 //----  length=coreleft();
 550         _nheapgrow();
 551         length=_memavl();
 552         start = (void huge *)(mm->nearheap = malloc(length));
 553
 554         length -= 16-(FP_OFF(start)&15);
 555         length -= SAVENEARHEAP;
 556         seglength = length / 16;                        // now in paragraphs
 557         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 558         MML_UseSpace(segstart,seglength, mm);
 559         mmi->nearheap = length;
 560
 561 //
 562 // get all available far conventional memory segments
 563 //
 564 //----  length=farcoreleft();
 565         _fheapgrow();
 566         length=_memavl();
 567         start = mm->farheap = halloc(length, 1);
 568         //start = mm->farheap = _fmalloc(length);
 569         length -= 16-(FP_OFF(start)&15);
 570         length -= SAVEFARHEAP;
 571         seglength = length / 16;                        // now in paragraphs
 572         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 573         MML_UseSpace(segstart,seglength, mm);
 574         mmi->farheap = length;
 575         mmi->mainmem = mmi->nearheap + mmi->farheap;
 576
 577
 578 //
 579 // detect EMS and allocate up to 64K at page frame
 580 //
 581         mmi->EMSmem = 0;
 582         for(i = 1;i < __argc;i++)
 583         {
 584                 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 585                         goto emsskip;                           // param NOEMS
 586         }
 587         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!
 588         if(MML_CheckForEMS())
 589         {
 590 //printf("EMS1\n");
 591                 MML_SetupEMS(mm);                                       // allocate space
 592                 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!
 593                 MML_UseSpace(mm->EMSpageframe,mm->EMSpagesmapped*0x400, mm);
 594 //printf("EMS3\n");
 595                 MM_MapEMS(mm);                                  // map in used pages
 596 //printf("EMS4\n");
 597                 mmi->EMSmem = mm->EMSpagesmapped*0x4000l;
 598         }
 599
 600 //
 601 // detect XMS and get upper memory blocks
 602 //
 603 emsskip:
 604         mmi->XMSmem = 0;
 605         for(i = 1;i < __argc;i++)
 606         {
 607                 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 608                         goto xmsskip;                           // param NOXMS
 609         }
 610 //      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!
 611         if(MML_CheckForXMS(mm))
 612         {
 613 //printf("XMS!\n");
 614                 MML_SetupXMS(mm, mmi);                                  // allocate as many UMBs as possible
 615         }
 616
 617 //
 618 // allocate the misc buffer
 619 //
 620 xmsskip:
 621         mm->mmrover = mm->mmhead;               // start looking for space after low block
 622
 623         MM_GetPtr(&(mm->bufferseg),BUFFERSIZE, mm, mmi);
 624 }
 625
 626 //==========================================================================
 627
 628 /*
 629 ====================
 630 =
 631 = MM_Shutdown
 632 =
 633 = Frees all conventional, EMS, and XMS allocated
 634 =
 635 ====================
 636 */
 637
 638 void MM_Shutdown(mminfo_t *mm)
 639 {
 640         if(!(mm->mmstarted))
 641                 return;
 642
 643         _ffree(mm->farheap);
 644         printf("far freed\n");
 645         free(mm->nearheap);
 646         printf("near freed\n");
 647         //hfree(mm->hugeheap);
 648         //printf("huge freed\n");
 649         if(MML_CheckForEMS()){ MML_ShutdownEMS(mm); printf("EMS freed\n"); }
 650         if(MML_CheckForXMS(mm)){ MML_ShutdownXMS(mm); printf("XMS freed\n"); }
 651 }
 652
 653 //==========================================================================
 654
 655 /*
 656 ====================
 657 =
 658 = MM_GetPtr
 659 =
 660 = Allocates an unlocked, unpurgable block
 661 =
 662 ====================
 663 */
 664
 665 void MM_GetPtr(memptr *baseptr,dword size, mminfo_t *mm, mminfotype *mmi)
 666 {
 667         mmblocktype huge *scan,huge *lastscan,huge *endscan,huge *purge,huge *next;
 668         int                     search;
 669         unsigned        needed,startseg;
 670
 671         needed = (size+15)/16;          // convert size from bytes to paragraphs
 672
 673         MM_GetNewBlock(mm);                             // fill in start and next after a spot is found
 674         mm->mmnew->length = needed;
 675         mm->mmnew->useptr = baseptr;
 676         mm->mmnew->attributes = BASEATTRIBUTES;
 677
 678         for(search = 0; search<3; search++)
 679         {
 680         //
 681         // first search:        try to allocate right after the rover, then on up
 682         // second search:       search from the head pointer up to the rover
 683         // third search:        compress memory, then scan from start
 684                 if(search == 1 && mm->mmrover == mm->mmhead)
 685                         search++;
 686
 687                 switch(search)
 688                 {
 689                 case 0:
 690                         lastscan = mm->mmrover;
 691                         scan = mm->mmrover->next;
 692                         endscan = NULL;
 693                         break;
 694                 case 1:
 695                         lastscan = mm->mmhead;
 696                         scan = mm->mmhead->next;
 697                         endscan = mm->mmrover;
 698                         break;
 699                 case 2:
 700                         MM_SortMem(mm);
 701                         lastscan = mm->mmhead;
 702                         scan = mm->mmhead->next;
 703                         endscan = NULL;
 704                         break;
 705                 }
 706
 707                 startseg = lastscan->start + lastscan->length;
 708
 709                 while(scan != endscan)
 710                 {
 711                         if(scan->start - startseg >= needed)
 712                         {
 713                         //
 714                         // got enough space between the end of lastscan and
 715                         // the start of scan, so throw out anything in the middle
 716                         // and allocate the new block
 717                         //
 718                                 purge = lastscan->next;
 719                                 lastscan->next = mm->mmnew;
 720                                 mm->mmnew->start = *(unsigned *)baseptr = startseg;
 721                                 mm->mmnew->next = scan;
 722                                 while(purge != scan)
 723                                 {       // free the purgable block
 724                                         next = purge->next;
 725                                         MM_FreeBlock(purge, mm);
 726                                         purge = next;           // purge another if not at scan
 727                                 }
 728                                 mm->mmrover = mm->mmnew;
 729                                 return; // good allocation!
 730                         }
 731
 732                         //
 733                         // if this block is purge level zero or locked, skip past it
 734                         //
 735                         if((scan->attributes & LOCKBIT)
 736                                 || !(scan->attributes & PURGEBITS) )
 737                         {
 738                                 lastscan = scan;
 739                                 startseg = lastscan->start + lastscan->length;
 740                         }
 741
 742
 743                         scan=scan->next;                // look at next line
 744                 }
 745         }
 746
 747         if (mm->bombonerror)
 748                 printf(OUT_OF_MEM_MSG,(size-mmi->nearheap));
 749         else
 750                 mm->mmerror = true;
 751 }
 752
 753 //==========================================================================
 754
 755 /*
 756 ====================
 757 =
 758 = MM_FreePtr
 759 =
 760 = Allocates an unlocked, unpurgable block
 761 =
 762 ====================
 763 */
 764
 765 void MM_FreePtr(memptr *baseptr, mminfo_t *mm)
 766 {
 767         mmblocktype huge *scan,huge *last;
 768
 769         last = mm->mmhead;
 770         scan = last->next;
 771
 772         if(baseptr == mm->mmrover->useptr)      // removed the last allocated block
 773                 mm->mmrover = mm->mmhead;
 774
 775         while(scan->useptr != baseptr && scan)
 776         {
 777                 last = scan;
 778                 scan = scan->next;
 779         }
 780
 781         if(!scan)
 782         {
 783                 printf("MM_FreePtr: Block not found!");
 784                 return;
 785         }
 786
 787         last->next = scan->next;
 788
 789         MM_FreeBlock(scan, mm);
 790 }
 791 //==========================================================================
 792
 793 /*
 794 =====================
 795 =
 796 = MM_SetPurge
 797 =
 798 = Sets the purge level for a block (locked blocks cannot be made purgable)
 799 =
 800 =====================
 801 */
 802
 803 void MM_SetPurge(memptr *baseptr, int purge, mminfo_t *mm)
 804 {
 805         mmblocktype huge *start;
 806
 807         start = mm->mmrover;
 808
 809         do
 810         {
 811                 if(mm->mmrover->useptr == baseptr)
 812                         break;
 813
 814                 mm->mmrover = mm->mmrover->next;
 815
 816                 if(!mm->mmrover)
 817                         mm->mmrover = mm->mmhead;
 818                 else if(mm->mmrover == start)
 819                 {
 820                         printf("MM_SetPurge: Block not found!");
 821                         return;
 822                 }
 823
 824         } while(1);
 825
 826         mm->mmrover->attributes &= ~PURGEBITS;
 827         mm->mmrover->attributes |= purge;
 828 }
 829
 830 //==========================================================================
 831
 832 /*
 833 =====================
 834 =
 835 = MM_SetLock
 836 =
 837 = Locks / unlocks the block
 838 =
 839 =====================
 840 */
 841
 842 void MM_SetLock(memptr *baseptr, boolean locked, mminfo_t *mm)
 843 {
 844         mmblocktype huge *start;
 845
 846         start = mm->mmrover;
 847
 848         do
 849         {
 850                 if(mm->mmrover->useptr == baseptr)
 851                         break;
 852
 853                 mm->mmrover = mm->mmrover->next;
 854
 855                 if(!mm->mmrover)
 856                         mm->mmrover = mm->mmhead;
 857                 else if(mm->mmrover == start)
 858                 {
 859                         printf("MM_SetLock: Block not found!");
 860                         return;
 861                 }
 862
 863         } while(1);
 864
 865         mm->mmrover->attributes &= ~LOCKBIT;
 866         mm->mmrover->attributes |= locked*LOCKBIT;
 867 }
 868
 869 //==========================================================================
 870
 871 /*
 872 =====================
 873 =
 874 = MM_SortMem
 875 =
 876 = Throws out all purgable stuff and compresses movable blocks
 877 =
 878 =====================
 879 */
 880
 881 void MM_SortMem(mminfo_t *mm)
 882 {
 883         mmblocktype huge *scan,huge *last,huge *next;
 884         unsigned        start,length,source,dest,oldborder;
 885         int                     playing;
 886
 887         //
 888         // lock down a currently playing sound
 889         //
 890 /*++++  playing = SD_SoundPlaying ();
 891         if(playing)
 892         {
 893                 switch (SoundMode)
 894                 {
 895                 case sdm_PC:
 896                         playing += STARTPCSOUNDS;
 897                         break;
 898                 case sdm_AdLib:
 899                         playing += STARTADLIBSOUNDS;
 900                         break;
 901                 }
 902                 MM_SetLock(&(memptr)audiosegs[playing],true);
 903         }
 904
 905
 906         SD_StopSound();*/
 907 //      oldborder = bordercolor;
 908 //      VW_ColorBorder (15);
 909
 910         if(beforesort)
 911                 beforesort();
 912
 913         scan = mm->mmhead;
 914
 915         last = NULL;            // shut up compiler warning
 916
 917         while(scan)
 918         {
 919                 if(scan->attributes & LOCKBIT)
 920                 {
 921                 //
 922                 // block is locked, so try to pile later blocks right after it
 923                 //
 924                         start = scan->start + scan->length;
 925                 }
 926                 else
 927                 {
 928                         if(scan->attributes & PURGEBITS)
 929                         {
 930                         //
 931                         // throw out the purgable block
 932                         //
 933                                 next = scan->next;
 934                                 MM_FreeBlock(scan, mm);
 935                                 last->next = next;
 936                                 scan = next;
 937                                 continue;
 938                         }
 939                         else
 940                         {
 941                         //
 942                         // push the non purgable block on top of the last moved block
 943                         //
 944                                 if(scan->start != start)
 945                                 {
 946                                         length = scan->length;
 947                                         source = scan->start;
 948                                         dest = start;
 949                                         while(length > 0xf00)
 950                                         {
 951                                                 movedata(source,0,dest,0,0xf00*16);
 952                                                 length -= 0xf00;
 953                                                 source += 0xf00;
 954                                                 dest += 0xf00;
 955                                         }
 956                                         movedata(source,0,dest,0,length*16);
 957
 958                                         scan->start = start;
 959                                         *(unsigned *)scan->useptr = start;
 960                                 }
 961                                 start = scan->start + scan->length;
 962                         }
 963                 }
 964
 965                 last = scan;
 966                 scan = scan->next;              // go to next block
 967         }
 968
 969         mm->mmrover = mm->mmhead;
 970
 971         if(aftersort)
 972                 aftersort();
 973
 974 //      VW_ColorBorder (oldborder);
 975
 976 /*++++  if(playing)
 977                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
 978 }
 979
 980
 981 //==========================================================================
 982
 983 //****#if 0
 984 /*
 985 =====================
 986 =
 987 = MM_ShowMemory
 988 =
 989 =====================
 990 */
 991
 992 void MM_ShowMemory(mminfo_t *mm)
 993 {
 994         mmblocktype huge *scan;
 995         unsigned color,temp;//, i;
 996         long    end,owner;
 997         char    scratch[80],str[10];
 998
 999 //****  VW_SetDefaultColors();
1000 //****  VW_SetLineWidth(40);
1001 //++++mh        temp = bufferofs;
1002 //++++mh        bufferofs = 0;
1003 //****  VW_SetScreen (0,0);
1004
1005         scan = mm->mmhead;
1006
1007         end = -1;
1008
1009 //CA_OpenDebug ();
1010
1011         while (scan)
1012         {
1013                 if(scan->attributes & PURGEBITS)
1014                         color = 5;              // dark purple = purgable
1015                 else
1016                         color = 9;              // medium blue = non purgable
1017                 if(scan->attributes & LOCKBIT)
1018                         color = 12;             // red = locked
1019                 if(scan->start<=end)
1020                 {
1021                         printf("MM_ShowMemory: Memory block order currupted!");
1022                         return;
1023                 }
1024                 end = scan->start+scan->length-1;
1025 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1026 //++++          VW_Plot(scan->start,0,15);
1027                 if(scan->next->start > end+1)
1028 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1029
1030 //****#if 0
1031 printf("Location:");
1032 printf("%x\t", scan->start);
1033 strcpy (scratch,"Size:");
1034 ltoa ((dword)scan->length*16,str,10);
1035 strcat (scratch,str);
1036 strcat (scratch,"\tOwner:0x");
1037 owner = (unsigned)scan->useptr;
1038 ultoa (owner,str,16);
1039 strcat (scratch,str);
1040 strcat (scratch,"\n");
1041 //++++write (debughandle,scratch,strlen(scratch));
1042 fprintf(stdout, "%s", scratch);
1043 //****#endif
1044
1045                 scan = scan->next;
1046         }
1047
1048 //CA_CloseDebug ();
1049
1050 //++++mh        IN_Ack();
1051 //****  VW_SetLineWidth(64);
1052 //++++mh        bufferofs = temp;
1053 }
1054 //****#endif
1055
1056 //==========================================================================
1057
1058
1059 /*
1060 ======================
1061 =
1062 = MM_UnusedMemory
1063 =
1064 = Returns the total free space without purging
1065 =
1066 ======================
1067 */
1068
1069 dword MM_UnusedMemory(mminfo_t *mm)
1070 {
1071         unsigned free;
1072         mmblocktype huge *scan;
1073
1074         free = 0;
1075         scan = mm->mmhead;
1076
1077         while(scan->next)
1078         {
1079                 free += scan->next->start - (scan->start + scan->length);
1080                 scan = scan->next;
1081         }
1082
1083         return free*16l;
1084 //      return free;
1085 }
1086
1087 //==========================================================================
1088
1089
1090 /*
1091 ======================
1092 =
1093 = MM_TotalFree
1094 =
1095 = Returns the total free space with purging
1096 =
1097 ======================
1098 */
1099
1100 dword MM_TotalFree(mminfo_t *mm)
1101 {
1102         unsigned free;
1103         mmblocktype huge *scan;
1104
1105         free = 0;
1106         scan = mm->mmhead;
1107
1108         while(scan->next)
1109         {
1110                 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1111                         free += scan->length;
1112                 free += scan->next->start - (scan->start + scan->length);
1113                 scan = scan->next;
1114         }
1115
1116         return free*16l;
1117 //      return free;
1118 }
1119
1120 //==========================================================================
1121
1122 /*
1123 =====================
1124 =
1125 = MM_Report
1126 =
1127 =====================
1128 */
1129
1130 void MM_Report(mminfo_t *mm, mminfotype *mmi)
1131 {
1132         if(MML_CheckForEMS())
1133         {
1134                 printf("EMM %x available\n", mm->EMSVer);
1135                 printf("totalEMSpages=%u\n", mm->totalEMSpages);
1136                 printf("freeEMSpages=%u\n", mm->freeEMSpages);
1137                 printf("EMSpageframe=%x\n", mm->EMSpageframe);
1138         }
1139         if(MML_CheckForXMS(mm)) printf("XMSaddr=%x\n", *XMSaddr);
1140         printf("near=%lu\n", mmi->nearheap);
1141         printf("far=%lu\n", mmi->farheap);
1142         printf("EMSmem=%lu\n", mmi->EMSmem);
1143         printf("XMSmem=%lu\n", mmi->XMSmem);
1144         printf("mainmem=%lu\n", mmi->mainmem);
1145         printf("UnusedMemory=%lu\n", MM_UnusedMemory(mm));
1146         printf("TotalFree=%lu\n", MM_TotalFree(mm));
1147 //      printf("\n");
1148 //      printf("UnusedMemory=%lu kb\n", MM_UnusedMemory()/10248);
1149 //      printf("TotalFree=%lu kb\n", MM_TotalFree()/10248);
1150 }
1151
1152 //==========================================================================
1153
1154 /*
1155 =====================
1156 =
1157 = MM_EMSVer
1158 =
1159 =====================
1160
1161
1162 int MM_EMSVer(void)
1163 {
1164         int EMSver;
1165         __asm
1166         {
1167                 mov             ah,EMS_VERSION
1168                 int             EMS_INT
1169                 mov             EMSver,ax
1170         }
1171         return(EMSver);
1172 }*/
1173
1174 //==========================================================================
1175
1176 /*
1177 =====================
1178 =
1179 = MM_BombOnError
1180 =
1181 =====================
1182 */
1183
1184 void MM_BombOnError(boolean bomb, mminfo_t *mm)
1185 {
1186         mm->bombonerror = bomb;
1187 }
1188
1189 void MM_GetNewBlock(mminfo_t *mm)
1190 {
1191         if(!mm->mmfree)
1192                 MML_ClearBlock(mm);
1193         mm->mmnew=mm->mmfree;
1194         mm->mmfree=mm->mmfree->next;
1195         /*if(!(mm->mmnew=mm->mmfree))
1196         {
1197                 printf("MM_GETNEWBLOCK: No free blocks!");
1198                 return;
1199         }
1200         mm->mmfree=mm->mmfree->next;*/
1201 }
1202
1203 void MM_FreeBlock(mmblocktype *x, mminfo_t *mm)
1204 {
1205         x->useptr=NULL;
1206         x->next=mm->mmfree;
1207         mm->mmfree=x;
1208 }