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;//,farlen;
 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;                     //todo: mm make it fucking massive as fuck!~
 541         mm->mmnew->attributes = LOCKBIT;
 542         mm->mmnew->next = NULL;
 543         mm->mmrover = mm->mmhead;
 544
 545 //      farlen=_bios_memsize()*1024;
 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         //length-=farlen;
 569         start = mm->farheap = halloc(length, sizeof(length));
 570         //start = mm->farheap = _fmalloc(length);
 571         length -= 16-(FP_OFF(start)&15);
 572         length -= SAVEFARHEAP;
 573         seglength = length / 16;                        // now in paragraphs
 574         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 575         MML_UseSpace(segstart,seglength, mm);
 576         mmi->farheap = length;
 577         mmi->mainmem = mmi->nearheap + mmi->farheap;
 578
 579
 580 //
 581 // detect EMS and allocate up to 64K at page frame
 582 //
 583         mmi->EMSmem = 0;
 584         for(i = 1;i < __argc;i++)
 585         {
 586                 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 587                         goto emsskip;                           // param NOEMS
 588         }
 589         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!
 590         if(MML_CheckForEMS())
 591         {
 592 //printf("EMS1\n");
 593                 MML_SetupEMS(mm);                                       // allocate space
 594                 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!
 595                 //TODO: EMS4! AND EMS 3.2 MASSIVE DATA HANDLMENT!
 596                 MML_UseSpace(mm->EMSpageframe,mm->EMSpagesmapped*0x400, mm);
 597 //printf("EMS3\n");
 598                 MM_MapEMS(mm);                                  // map in used pages
 599 //printf("EMS4\n");
 600                 mmi->EMSmem = mm->EMSpagesmapped*0x4000l;
 601         }
 602
 603 //
 604 // detect XMS and get upper memory blocks
 605 //
 606 emsskip:
 607         mmi->XMSmem = 0;
 608         for(i = 1;i < __argc;i++)
 609         {
 610                 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 611                         goto xmsskip;                           // param NOXMS
 612         }
 613 //      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!
 614         if(MML_CheckForXMS(mm))
 615         {
 616 //printf("XMS!\n");
 617                 MML_SetupXMS(mm, mmi);                                  // allocate as many UMBs as possible
 618         }
 619
 620 //
 621 // allocate the misc buffer
 622 //
 623 xmsskip:
 624         mm->mmrover = mm->mmhead;               // start looking for space after low block
 625
 626         MM_GetPtr(&(mm->bufferseg),BUFFERSIZE, mm, mmi);
 627 }
 628
 629 //==========================================================================
 630
 631 /*
 632 ====================
 633 =
 634 = MM_Shutdown
 635 =
 636 = Frees all conventional, EMS, and XMS allocated
 637 =
 638 ====================
 639 */
 640
 641 void MM_Shutdown(mminfo_t *mm)
 642 {
 643         if(!(mm->mmstarted))
 644                 return;
 645
 646         _ffree(mm->farheap);
 647         printf("far freed\n");
 648         free(mm->nearheap);
 649         printf("near freed\n");
 650         //hfree(mm->hugeheap);
 651         //printf("huge freed\n");
 652         if(MML_CheckForEMS()){ MML_ShutdownEMS(mm); printf("EMS freed\n"); }
 653         if(MML_CheckForXMS(mm)){ MML_ShutdownXMS(mm); printf("XMS freed\n"); }
 654 }
 655
 656 //==========================================================================
 657
 658 /*
 659 ====================
 660 =
 661 = MM_GetPtr
 662 =
 663 = Allocates an unlocked, unpurgable block
 664 =
 665 ====================
 666 */
 667
 668 void MM_GetPtr(memptr *baseptr,dword size, mminfo_t *mm, mminfotype *mmi)
 669 {
 670         mmblocktype huge *scan,huge *lastscan,huge *endscan,huge *purge,huge *next;
 671         int                     search;
 672         unsigned        needed,startseg;
 673
 674         needed = (size+15)/16;          // convert size from bytes to paragraphs
 675
 676         MM_GetNewBlock(mm);                             // fill in start and next after a spot is found
 677         mm->mmnew->length = needed;
 678         mm->mmnew->useptr = baseptr;
 679         mm->mmnew->attributes = BASEATTRIBUTES;
 680
 681         for(search = 0; search<3; search++)
 682         {
 683         //
 684         // first search:        try to allocate right after the rover, then on up
 685         // second search:       search from the head pointer up to the rover
 686         // third search:        compress memory, then scan from start
 687                 if(search == 1 && mm->mmrover == mm->mmhead)
 688                         search++;
 689
 690                 switch(search)
 691                 {
 692                 case 0:
 693                         lastscan = mm->mmrover;
 694                         scan = mm->mmrover->next;
 695                         endscan = NULL;
 696                         break;
 697                 case 1:
 698                         lastscan = mm->mmhead;
 699                         scan = mm->mmhead->next;
 700                         endscan = mm->mmrover;
 701                         break;
 702                 case 2:
 703                         MM_SortMem(mm);
 704                         lastscan = mm->mmhead;
 705                         scan = mm->mmhead->next;
 706                         endscan = NULL;
 707                         break;
 708                 }
 709
 710                 startseg = lastscan->start + lastscan->length;
 711
 712                 while(scan != endscan)
 713                 {
 714                         if(scan->start - startseg >= needed)
 715                         {
 716                         //
 717                         // got enough space between the end of lastscan and
 718                         // the start of scan, so throw out anything in the middle
 719                         // and allocate the new block
 720                         //
 721                                 purge = lastscan->next;
 722                                 lastscan->next = mm->mmnew;
 723                                 mm->mmnew->start = *(unsigned *)baseptr = startseg;
 724                                 mm->mmnew->next = scan;
 725                                 while(purge != scan)
 726                                 {       // free the purgable block
 727                                         next = purge->next;
 728                                         MM_FreeBlock(purge, mm);
 729                                         purge = next;           // purge another if not at scan
 730                                 }
 731                                 mm->mmrover = mm->mmnew;
 732                                 return; // good allocation!
 733                         }
 734
 735                         //
 736                         // if this block is purge level zero or locked, skip past it
 737                         //
 738                         if((scan->attributes & LOCKBIT)
 739                                 || !(scan->attributes & PURGEBITS) )
 740                         {
 741                                 lastscan = scan;
 742                                 startseg = lastscan->start + lastscan->length;
 743                         }
 744
 745
 746                         scan=scan->next;                // look at next line
 747                 }
 748         }
 749
 750         if (mm->bombonerror)
 751                 printf(OUT_OF_MEM_MSG,(size-mmi->nearheap));
 752         else
 753                 mm->mmerror = true;
 754 }
 755
 756 //==========================================================================
 757
 758 /*
 759 ====================
 760 =
 761 = MM_FreePtr
 762 =
 763 = Allocates an unlocked, unpurgable block
 764 =
 765 ====================
 766 */
 767
 768 void MM_FreePtr(memptr *baseptr, mminfo_t *mm)
 769 {
 770         mmblocktype huge *scan,huge *last;
 771
 772         last = mm->mmhead;
 773         scan = last->next;
 774
 775         if(baseptr == mm->mmrover->useptr)      // removed the last allocated block
 776                 mm->mmrover = mm->mmhead;
 777
 778         while(scan->useptr != baseptr && scan)
 779         {
 780                 last = scan;
 781                 scan = scan->next;
 782         }
 783
 784         if(!scan)
 785         {
 786                 printf("MM_FreePtr: Block not found!");
 787                 return;
 788         }
 789
 790         last->next = scan->next;
 791
 792         MM_FreeBlock(scan, mm);
 793 }
 794 //==========================================================================
 795
 796 /*
 797 =====================
 798 =
 799 = MM_SetPurge
 800 =
 801 = Sets the purge level for a block (locked blocks cannot be made purgable)
 802 =
 803 =====================
 804 */
 805
 806 void MM_SetPurge(memptr *baseptr, int purge, mminfo_t *mm)
 807 {
 808         mmblocktype huge *start;
 809
 810         start = mm->mmrover;
 811
 812         do
 813         {
 814                 if(mm->mmrover->useptr == baseptr)
 815                         break;
 816
 817                 mm->mmrover = mm->mmrover->next;
 818
 819                 if(!mm->mmrover)
 820                         mm->mmrover = mm->mmhead;
 821                 else if(mm->mmrover == start)
 822                 {
 823                         printf("MM_SetPurge: Block not found!");
 824                         return;
 825                 }
 826
 827         } while(1);
 828
 829         mm->mmrover->attributes &= ~PURGEBITS;
 830         mm->mmrover->attributes |= purge;
 831 }
 832
 833 //==========================================================================
 834
 835 /*
 836 =====================
 837 =
 838 = MM_SetLock
 839 =
 840 = Locks / unlocks the block
 841 =
 842 =====================
 843 */
 844
 845 void MM_SetLock(memptr *baseptr, boolean locked, mminfo_t *mm)
 846 {
 847         mmblocktype huge *start;
 848
 849         start = mm->mmrover;
 850
 851         do
 852         {
 853                 if(mm->mmrover->useptr == baseptr)
 854                         break;
 855
 856                 mm->mmrover = mm->mmrover->next;
 857
 858                 if(!mm->mmrover)
 859                         mm->mmrover = mm->mmhead;
 860                 else if(mm->mmrover == start)
 861                 {
 862                         printf("MM_SetLock: Block not found!");
 863                         return;
 864                 }
 865
 866         } while(1);
 867
 868         mm->mmrover->attributes &= ~LOCKBIT;
 869         mm->mmrover->attributes |= locked*LOCKBIT;
 870 }
 871
 872 //==========================================================================
 873
 874 /*
 875 =====================
 876 =
 877 = MM_SortMem
 878 =
 879 = Throws out all purgable stuff and compresses movable blocks
 880 =
 881 =====================
 882 */
 883
 884 void MM_SortMem(mminfo_t *mm)
 885 {
 886         mmblocktype huge *scan,huge *last,huge *next;
 887         unsigned        start,length,source,dest,oldborder;
 888         int                     playing;
 889
 890         //
 891         // lock down a currently playing sound
 892         //
 893 /*++++  playing = SD_SoundPlaying ();
 894         if(playing)
 895         {
 896                 switch (SoundMode)
 897                 {
 898                 case sdm_PC:
 899                         playing += STARTPCSOUNDS;
 900                         break;
 901                 case sdm_AdLib:
 902                         playing += STARTADLIBSOUNDS;
 903                         break;
 904                 }
 905                 MM_SetLock(&(memptr)audiosegs[playing],true);
 906         }
 907
 908
 909         SD_StopSound();*/
 910 //      oldborder = bordercolor;
 911 //      VW_ColorBorder (15);
 912
 913         if(beforesort)
 914                 beforesort();
 915
 916         scan = mm->mmhead;
 917
 918         last = NULL;            // shut up compiler warning
 919
 920         while(scan)
 921         {
 922                 if(scan->attributes & LOCKBIT)
 923                 {
 924                 //
 925                 // block is locked, so try to pile later blocks right after it
 926                 //
 927                         start = scan->start + scan->length;
 928                 }
 929                 else
 930                 {
 931                         if(scan->attributes & PURGEBITS)
 932                         {
 933                         //
 934                         // throw out the purgable block
 935                         //
 936                                 next = scan->next;
 937                                 MM_FreeBlock(scan, mm);
 938                                 last->next = next;
 939                                 scan = next;
 940                                 continue;
 941                         }
 942                         else
 943                         {
 944                         //
 945                         // push the non purgable block on top of the last moved block
 946                         //
 947                                 if(scan->start != start)
 948                                 {
 949                                         length = scan->length;
 950                                         source = scan->start;
 951                                         dest = start;
 952                                         while(length > 0xf00)
 953                                         {
 954                                                 movedata(source,0,dest,0,0xf00*16);
 955                                                 length -= 0xf00;
 956                                                 source += 0xf00;
 957                                                 dest += 0xf00;
 958                                         }
 959                                         movedata(source,0,dest,0,length*16);
 960
 961                                         scan->start = start;
 962                                         *(unsigned *)scan->useptr = start;
 963                                 }
 964                                 start = scan->start + scan->length;
 965                         }
 966                 }
 967
 968                 last = scan;
 969                 scan = scan->next;              // go to next block
 970         }
 971
 972         mm->mmrover = mm->mmhead;
 973
 974         if(aftersort)
 975                 aftersort();
 976
 977 //      VW_ColorBorder (oldborder);
 978
 979 /*++++  if(playing)
 980                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
 981 }
 982
 983
 984 //==========================================================================
 985
 986 //****#if 0
 987 /*
 988 =====================
 989 =
 990 = MM_ShowMemory
 991 =
 992 =====================
 993 */
 994
 995 void MM_ShowMemory(mminfo_t *mm)
 996 {
 997         mmblocktype huge *scan;
 998         unsigned color,temp;//, i;
 999         long    end,owner;
1000         char    scratch[80],str[10];
1001
1002 //****  VW_SetDefaultColors();
1003 //****  VW_SetLineWidth(40);
1004 //++++mh        temp = bufferofs;
1005 //++++mh        bufferofs = 0;
1006 //****  VW_SetScreen (0,0);
1007
1008         scan = mm->mmhead;
1009
1010         end = -1;
1011
1012 //CA_OpenDebug ();
1013
1014         while (scan)
1015         {
1016                 if(scan->attributes & PURGEBITS)
1017                         color = 5;              // dark purple = purgable
1018                 else
1019                         color = 9;              // medium blue = non purgable
1020                 if(scan->attributes & LOCKBIT)
1021                         color = 12;             // red = locked
1022                 if(scan->start<=end)
1023                 {
1024                         printf("MM_ShowMemory: Memory block order currupted!");
1025                         return;
1026                 }
1027                 end = scan->start+scan->length-1;
1028 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1029 //++++          VW_Plot(scan->start,0,15);
1030                 if(scan->next->start > end+1)
1031 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1032
1033 //****#if 0
1034 printf("Location:");
1035 printf("%x\t", scan->start);
1036 strcpy (scratch,"Size:");
1037 ltoa ((dword)scan->length*16,str,10);
1038 strcat (scratch,str);
1039 strcat (scratch,"\tOwner:0x");
1040 owner = (unsigned)scan->useptr;
1041 ultoa (owner,str,16);
1042 strcat (scratch,str);
1043 strcat (scratch,"\n");
1044 //++++write (debughandle,scratch,strlen(scratch));
1045 fprintf(stdout, "%s", scratch);
1046 //****#endif
1047
1048                 scan = scan->next;
1049         }
1050
1051 //CA_CloseDebug ();
1052
1053 //++++mh        IN_Ack();
1054 //****  VW_SetLineWidth(64);
1055 //++++mh        bufferofs = temp;
1056 }
1057 //****#endif
1058
1059 //==========================================================================
1060
1061
1062 /*
1063 ======================
1064 =
1065 = MM_UnusedMemory
1066 =
1067 = Returns the total free space without purging
1068 =
1069 ======================
1070 */
1071
1072 dword MM_UnusedMemory(mminfo_t *mm)
1073 {
1074         unsigned free;
1075         mmblocktype huge *scan;
1076
1077         free = 0;
1078         scan = mm->mmhead;
1079
1080         while(scan->next)
1081         {
1082                 free += scan->next->start - (scan->start + scan->length);
1083                 scan = scan->next;
1084         }
1085
1086         return free*16l;
1087 //      return free;
1088 }
1089
1090 //==========================================================================
1091
1092
1093 /*
1094 ======================
1095 =
1096 = MM_TotalFree
1097 =
1098 = Returns the total free space with purging
1099 =
1100 ======================
1101 */
1102
1103 dword MM_TotalFree(mminfo_t *mm)
1104 {
1105         unsigned free;
1106         mmblocktype huge *scan;
1107
1108         free = 0;
1109         scan = mm->mmhead;
1110
1111         while(scan->next)
1112         {
1113                 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1114                         free += scan->length;
1115                 free += scan->next->start - (scan->start + scan->length);
1116                 scan = scan->next;
1117         }
1118
1119         return free*16l;
1120 //      return free;
1121 }
1122
1123 //==========================================================================
1124
1125 /*
1126 =====================
1127 =
1128 = MM_Report
1129 =
1130 =====================
1131 */
1132
1133 void MM_Report(mminfo_t *mm, mminfotype *mmi)
1134 {
1135         if(MML_CheckForEMS())
1136         {
1137                 printf("EMM %x available\n", mm->EMSVer);
1138                 printf("totalEMSpages=%u\n", mm->totalEMSpages);
1139                 printf("freeEMSpages=%u\n", mm->freeEMSpages);
1140                 printf("EMSpageframe=%x\n", mm->EMSpageframe);
1141         }
1142         if(MML_CheckForXMS(mm)) printf("XMSaddr=%x\n", *XMSaddr);
1143         printf("near=%lu\n", mmi->nearheap);
1144         printf("far=%lu\n", mmi->farheap);
1145         printf("EMSmem=%lu\n", mmi->EMSmem);
1146         printf("XMSmem=%lu\n", mmi->XMSmem);
1147         printf("mainmem=%lu\n", mmi->mainmem);
1148         printf("UnusedMemory=%lu\n", MM_UnusedMemory(mm));
1149         printf("TotalFree=%lu\n", MM_TotalFree(mm));
1150 //      printf("\n");
1151 //      printf("UnusedMemory=%lu kb\n", MM_UnusedMemory()/10248);
1152 //      printf("TotalFree=%lu kb\n", MM_TotalFree()/10248);
1153 }
1154
1155 //==========================================================================
1156
1157 /*
1158 =====================
1159 =
1160 = MM_EMSVer
1161 =
1162 =====================
1163
1164
1165 int MM_EMSVer(void)
1166 {
1167         int EMSver;
1168         __asm
1169         {
1170                 mov             ah,EMS_VERSION
1171                 int             EMS_INT
1172                 mov             EMSver,ax
1173         }
1174         return(EMSver);
1175 }*/
1176
1177 //==========================================================================
1178
1179 /*
1180 =====================
1181 =
1182 = MM_BombOnError
1183 =
1184 =====================
1185 */
1186
1187 void MM_BombOnError(boolean bomb, mminfo_t *mm)
1188 {
1189         mm->bombonerror = bomb;
1190 }
1191
1192 void MM_GetNewBlock(mminfo_t *mm)
1193 {
1194         if(!mm->mmfree)
1195                 MML_ClearBlock(mm);
1196         mm->mmnew=mm->mmfree;
1197         mm->mmfree=mm->mmfree->next;
1198         /*if(!(mm->mmnew=mm->mmfree))
1199         {
1200                 printf("MM_GETNEWBLOCK: No free blocks!");
1201                 return;
1202         }
1203         mm->mmfree=mm->mmfree->next;*/
1204 }
1205
1206 void MM_FreeBlock(mmblocktype *x, mminfo_t *mm)
1207 {
1208         x->useptr=NULL;
1209         x->next=mm->mmfree;
1210         mm->mmfree=x;
1211 }