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         static char     emmname[] = "EMMXXXX0"; //fix by andrius4669
  87 //              mov     dx,OFFSET emmname
  88         __asm {
  89                 //LEA   DX, emmname     //fix by andrius4669
  90                 mov     dx,OFFSET emmname       //fix by andrius4669
  91                 mov     ax,0x3d00
  92                 int     0x21            // try to open EMMXXXX0 device
  93                 jc      error
  94
  95                 mov     bx,ax
  96                 mov     ax,0x4400
  97
  98                 int     0x21            // get device info
  99                 jc      error
 100
 101                 and     dx,0x80
 102                 jz      error
 103
 104                 mov     ax,0x4407
 105
 106                 int     0x21            // get status
 107                 jc      error
 108                 or      al,al
 109                 jz      error
 110
 111                 mov     ah,0x3e
 112                 int     0x21            // close handle
 113                 jc      error
 114                 //
 115                 // EMS is good
 116                 //
 117                 mov     emmcfems,1
 118                 jmp End
 119                 error:
 120                 //
 121                 // EMS is bad
 122                 //
 123                 mov     emmcfems,0
 124                 End:
 125         }
 126         return(emmcfems);
 127 }
 128
 129
 130 /*
 131 ======================
 132 =
 133 = MML_SetupEMS
 134 =
 135 =======================
 136 */
 137
 138 byte MML_SetupEMS(mminfo_t *mm)
 139 {
 140         byte    str[160];
 141         byte    err;
 142         boolean errorflag=false;
 143
 144         unsigned int EMSVer = 0;
 145         //byte  EMS_status;
 146         unsigned        totalEMSpages,freeEMSpages,EMSpageframe,EMSpagesmapped,EMShandle;
 147         totalEMSpages = freeEMSpages = EMSpageframe = EMSpagesmapped = 0;
 148
 149         __asm
 150                 {
 151                 mov     ah,EMS_STATUS
 152                 int     EMS_INT                                         // make sure EMS hardware is present
 153                 or      ah,ah
 154                 //mov   [EMS_status],ah
 155                 jnz     error
 156
 157                 mov     ah,EMS_VERSION
 158                 int     EMS_INT
 159                 or      ah,ah
 160                 jnz     error
 161                 mov     [EMSVer],ax                             //      set EMSVer
 162                 cmp     al,0x32                                         // only work on ems 3.2 or greater
 163                 jb      error
 164
 165                 mov     ah,EMS_GETFRAME
 166                 int     EMS_INT                                         // find the page frame address
 167                 or      ah,ah
 168                 jnz     error
 169                 mov     [EMSpageframe],bx
 170
 171                 mov     ah,EMS_GETPAGES
 172                 int     EMS_INT                                         // find out how much EMS is there
 173                 or      ah,ah
 174                 jnz     error
 175                 mov     [totalEMSpages],dx
 176                 mov     [freeEMSpages],bx
 177                 or      bx,bx
 178                 jz      noEMS                                           // no EMS at all to allocate
 179                                                                                         //EXPAND DONG!!!!
 180                 cmp     [EMSVer],0x40
 181                 jb      low
 182                 cmp     bx,[freeEMSpages]
 183                 jle     getpages
 184                 mov     bx,[freeEMSpages]
 185                 jmp     getpages
 186
 187 low:
 188                 cmp     bx,4
 189                 jle     getpages                                        // there is only 1,2,3,or 4 pages
 190                 mov     bx,4                                            // we can't use more than 4 pages
 191
 192 getpages:
 193                 mov     [EMSpagesmapped],bx
 194                 mov     ah,EMS_ALLOCPAGES                       // allocate up to 64k of EMS
 195                 int     EMS_INT
 196                 or      ah,ah
 197                 jnz     error
 198                 mov     [EMShandle],dx
 199                 jmp End
 200 error:
 201                 mov     err,ah
 202                 mov     errorflag,1
 203                 jmp End
 204 noEMS:
 205 End:
 206         }
 207         if(errorflag==true)
 208         {
 209                 //err = CPURegs.h.ah;
 210                 strcpy(str,"MM_SetupEMS: EMS error ");
 211                 //itoa(err,str2,16);
 212                 MM_EMSerr(&str, err);
 213                 printf("%s\n",str);
 214                 return err;
 215         }
 216         mm->totalEMSpages=totalEMSpages;
 217         mm->freeEMSpages=freeEMSpages;
 218         mm->EMSpageframe=EMSpageframe;
 219         mm->EMSpagesmapped=EMSpagesmapped;
 220         mm->EMShandle=EMShandle;
 221         mm->EMSVer=EMSVer;
 222         return 0;
 223 }
 224
 225
 226 /*
 227 ======================
 228 =
 229 = MML_ShutdownEMS
 230 =
 231 =======================
 232 */
 233
 234 void MML_ShutdownEMS(mminfo_t *mm)
 235 {
 236         boolean errorflag=false;
 237         unsigned EMShandle=mm->EMShandle;
 238
 239         if(!EMShandle)
 240                 return;
 241         __asm
 242         {
 243                 mov     ah,EMS_FREEPAGES
 244                 mov     dx,[EMShandle]
 245                 int     EMS_INT
 246                 or      ah,ah
 247                 jz      ok
 248                 mov     errorflag,1
 249                 ok:
 250         }
 251         if(errorflag==true) printf("MML_ShutdownEMS: Error freeing EMS!\n");    //++++ add something
 252 }
 253
 254 /*
 255 ====================
 256 =
 257 = MM_MapEMS
 258 =
 259 = Maps the 64k of EMS used by memory manager into the page frame
 260 = for general use.  This only needs to be called if you are keeping
 261 = other things in EMS.
 262 =
 263 ====================
 264 */
 265
 266 byte MM_MapEMS(mminfo_t *mm, mminfotype *mmi)
 267 {
 268         byte    str[160];
 269         unsigned        EMShandle;
 270         byte err;
 271         boolean errorflag=false;
 272         int     i;
 273         EMShandle=mm->EMShandle;
 274
 275         for (i=0;i<4/*MAPPAGES*/;i++)
 276         {
 277                 __asm
 278                 {
 279                         mov     ah,EMS_MAPPAGE
 280                         mov     bx,[i]                  // logical page
 281                         mov     al,bl                   // physical page
 282                         mov     dx,[EMShandle]  // handle
 283                         int     EMS_INT
 284                         or      ah,ah
 285                         jnz     error
 286                         jmp End
 287                         error:
 288                         mov     err,ah
 289                         mov     errorflag,1
 290                         End:
 291                 }
 292                 if(errorflag==true)
 293                 {
 294                         //err = CPURegs.h.ah;
 295                         strcpy(str,"MM_MapEMS: EMS error ");
 296                         //itoa(err,str2,16);
 297                         MM_EMSerr(str, err);
 298                         printf("%s\n",str);
 299                         //printf("FACK! %x\n", err);
 300                         return err;
 301                 }
 302         }
 303         mmi->EMSmem = (i)*0x4000lu;
 304         return 0;
 305 }
 306
 307 byte MM_MapXEMS(mminfo_t *mm, mminfotype *mmi)
 308 {
 309 //SUB EMS.MapXPages (PhysicalStart, LogicalStart, NumPages, Handle)
 310
 311         //Maps up to 4 logical EMS pages to physical pages in the page frame, where:
 312         //PhysicalStart = Physical page first logical page is mapped to
 313         //LogicalStart  = First logical page to map
 314         //NumPages      = Number of pages to map (1 to 4)
 315         //Handle        = EMS handle logical pages are allocated to
 316
 317   /*//Create a buffer containing the page information
 318 //  FOR x = 0 TO NumPages - 1
 319 //    MapInfo$ = MapInfo$ + MKI$(LogicalStart + x) + MKI$(PhysicalStart + x)
 320 //  NEXT*/
 321
 322 //  Regs.ax = 0x5000                           //Map the pages in the buffer
 323 //  Regs.cx = NumPages                         //to the pageframe
 324 //  Regs.dx = Handle
 325 //  Regs.ds = VARSEG(MapInfo$)
 326 //  Regs.si = SADD(MapInfo$)
 327 //  InterruptX 0x67, Regs, Regs
 328 //      EMS.Error = (Regs.ax AND 0xFF00&) \ 0x100  //Store the status code
 329
 330 //END SUB
 331         byte    str[160];
 332         byte err;
 333         word    EMShandle;
 334         boolean errorflag=false;
 335         int     i;
 336         EMShandle=mm->EMShandle;
 337
 338         if(mm->EMSVer<0x40)
 339                 return 5;
 340
 341         for (i=0;i<MAPPAGES;i++)
 342         {
 343                 __asm
 344                 {
 345                         mov     ah,EMS_MAPXPAGE
 346                         mov     cx,[i]                  // logical page
 347                         mov     al,bl                   // physical page
 348                         mov     dx,[EMShandle]  // handle
 349                         int     EMS_INT
 350                         or      ah,ah
 351                         jnz     error
 352                         jmp End
 353                         error:
 354                         mov     err,ah
 355                         mov     errorflag,1
 356                         End:
 357                 }
 358                 if(errorflag==true)
 359                 {
 360                         //err = CPURegs.h.ah;
 361                         //strcpy(str,"MM_MapXEMS: EMS error 0x");
 362                         strcpy(str,"MM_MapXEMS: EMS error ");
 363                         //itoa(err,str2,16);
 364                         MM_EMSerr(&str, err);
 365                         printf("%s\n",str);
 366                         //printf("%s%x\n",str, err);
 367                         //printf("FACK! %x\n", err);
 368                         return err;
 369                 }
 370         }
 371         mmi->EMSmem = (i)*0x4000lu;
 372         return 0;
 373 }
 374
 375 //==========================================================================
 376
 377 /*
 378 ======================
 379 =
 380 = MML_CheckForXMS
 381 =
 382 = Check for XMM driver
 383 =
 384 =======================
 385 */
 386
 387 boolean MML_CheckForXMS(mminfo_t *mm)
 388 {
 389         boolean errorflag=false;
 390         mm->numUMBs = 0;
 391
 392         __asm
 393         {
 394                 mov     ax,0x4300
 395                 int     0x2f                            // query status of installed diver
 396                 cmp     al,0x80
 397                 je      good
 398                 mov     errorflag,1
 399                 good:
 400         }
 401         if(errorflag==true) return false;
 402         else return true;
 403 }
 404
 405
 406 /*
 407 ======================
 408 =
 409 = MML_SetupXMS
 410 =
 411 = Try to allocate all upper memory block
 412 =
 413 =======================
 414 */
 415
 416 void MML_SetupXMS(mminfo_t *mm, mminfotype *mmi)
 417 {
 418         unsigned        base,size;
 419
 420 getmemory:
 421         __asm
 422         {
 423                 mov     ax,0x4310
 424                 int     0x2f
 425                 mov     [WORD PTR XMSaddr],bx
 426                 mov     [WORD PTR XMSaddr+2],es         // function pointer to XMS driver
 427
 428                 mov     ah,XMS_ALLOCUMB
 429                 mov     dx,0xffff                                       // try for largest block possible
 430                 //mov     ax,dx                                         // Set available Kbytes.
 431                 call    [DWORD PTR XMSaddr]
 432                 or      ax,ax
 433                 jnz     gotone
 434
 435                 cmp     bl,0xb0                                         // error: smaller UMB is available
 436                 jne     done;
 437
 438                 mov     ah,XMS_ALLOCUMB
 439                 call    [DWORD PTR XMSaddr]             // DX holds largest available UMB
 440                 or      ax,ax
 441                 jz      done                                            // another error...
 442
 443 gotone:
 444                 mov     [base],bx
 445                 mov     [size],dx
 446 done:
 447         }
 448         printf("base=%u ", base); printf("size=%u\n", size);
 449         MML_UseSpace(base,size, mm);
 450         mmi->XMSmem += size*16;
 451         mm->UMBbase[mm->numUMBs] = base;
 452         mm->numUMBs++;
 453         if(mm->numUMBs < MAXUMBS)
 454                 goto getmemory;
 455 }
 456
 457
 458 /*
 459 ======================
 460 =
 461 = MML_ShutdownXMS
 462 =
 463 ======================
 464 */
 465
 466 void MML_ShutdownXMS(mminfo_t *mm)
 467 {
 468         int     i;
 469         unsigned        base;
 470
 471         for (i=0;i<mm->numUMBs;i++)
 472         {
 473                 base = mm->UMBbase[i];
 474                 __asm
 475                 {
 476                         mov     ah,XMS_FREEUMB
 477                         mov     dx,[base]
 478                         call    [DWORD PTR XMSaddr]
 479                 }
 480         }
 481 }
 482
 483 //==========================================================================
 484
 485 /*
 486 ======================
 487 =
 488 = MML_UseSpace
 489 =
 490 = Marks a range of paragraphs as usable by the memory manager
 491 = This is used to mark space for the near heap, far heap, ems page frame,
 492 = and upper memory blocks
 493 =
 494 ======================
 495 */
 496
 497 void MML_UseSpace(/*d*/word segstart, dword seglength, mminfo_t *mm)
 498 {
 499         mmblocktype huge *scan,huge *last;
 500         word            segm;
 501         dword   oldend;
 502         dword           extra;
 503
 504         scan = last = mm->mmhead;
 505         mm->mmrover = mm->mmhead;               // reset rover to start of memory
 506
 507 //
 508 // search for the block that contains the range of segments
 509 //
 510         while(scan->start+scan->length < segstart)
 511         {
 512                 last = scan;
 513                 scan = scan->next;
 514         }
 515
 516         //find out how many blocks it spans!
 517         if(seglength>0xffffu)
 518         {
 519 //              segm=seglength/0x4000u;
 520                 segm=seglength/0xffffu;
 521         }
 522         else segm=1;
 523
 524         //++++emsver stuff!
 525         if(segm>1/*extra>0xfffflu*/)
 526         {
 527                 /*__asm
 528                 {
 529                         push    ds
 530                         mov     ax,ds
 531                         inc             ax
 532                         mov     ds,ax
 533                 }*/
 534
 535
 536 //MML_UseSpace(?segstart?, ?length?, mm);
 537
 538                 /*__asm
 539                 {
 540                         pop ds
 541                 }*/
 542                 //printf("MML_UseSpace: Segment spans two blocks!\n");
 543         }
 544
 545 //
 546 // take the given range out of the block
 547 //
 548         oldend = scan->start + scan->length;
 549         extra = oldend - (segstart+seglength);
 550 /*
 551 printf("segm=%u ", segm);
 552 printf("ex=%lu  ", extra);
 553 printf("start+seglen=%lu        ", segstart+seglength);
 554 printf("len=%u  ", scan->length);
 555 printf("segsta=%x       ", segstart);
 556 printf("seglen=%lu\n", seglength);
 557 */
 558 //segu:
 559 //++++todo: linked list of segment!
 560 //printf("segm=%lu\n", segm);
 561         if(segstart == scan->start)
 562         {
 563                 last->next = scan->next;                        // unlink block
 564                 MM_FreeBlock(scan, mm);
 565                 scan = last;
 566         }
 567         else
 568                 scan->length = segstart-scan->start;    // shorten block
 569
 570 //      segm--;
 571
 572         if(extra > 0)
 573         {
 574                 MM_GetNewBlock(mm);
 575                 mm->mmnew->next = scan->next;
 576                 scan->next = mm->mmnew;
 577                 mm->mmnew->start = segstart+seglength;
 578                 mm->mmnew->length = extra;
 579                 mm->mmnew->attributes = LOCKBIT;
 580         }//else if(segm>0) goto segu;
 581
 582 }
 583
 584 //==========================================================================
 585
 586 /*
 587 ====================
 588 =
 589 = MML_ClearBlock
 590 =
 591 = We are out of blocks, so free a purgable block
 592 =
 593 ====================
 594 */
 595
 596 void MML_ClearBlock(mminfo_t *mm)
 597 {
 598         mmblocktype huge *scan,huge *last;
 599
 600         scan = mm->mmhead->next;
 601
 602         while(scan)
 603         {
 604                 if(!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS))
 605                 {
 606                         MM_FreePtr(scan->useptr, mm);
 607                         return;
 608                 }
 609                 scan = scan->next;
 610         }
 611
 612         printf("MM_ClearBlock: No purgable blocks!\n");
 613 }
 614
 615
 616 //==========================================================================
 617
 618 /*
 619 ===================
 620 =
 621 = MM_Startup
 622 =
 623 = Grabs all space from turbo with malloc/farmalloc
 624 = Allocates bufferseg misc buffer
 625 =
 626 ===================
 627 */
 628
 629 void MM_Startup(mminfo_t *mm, mminfotype *mmi)
 630 {
 631         int i;
 632         dword length,seglength;
 633         void huge       *start;
 634         unsigned        segstart,endfree;
 635
 636         printf("mmi->segu=%Fp\n", (mmi->segu));
 637         if(mm->mmstarted)
 638                 MM_Shutdown(mm);
 639
 640         mm->mmstarted = true;
 641         mm->bombonerror = true;
 642
 643 //
 644 // set up the linked list (everything in the free list;
 645 //
 646         //printf("              linked list making!\n");
 647         mm->mmhead = NULL;
 648         mm->mmfree = &(mm->mmblocks[0]);
 649         for(i=0;i<MAXBLOCKS-1;i++)
 650         {
 651                 mm->mmblocks[i].next = &(mm->mmblocks[i+1]);
 652         }
 653         mm->mmblocks[i].next = NULL;
 654         printf("mmi->segu=%Fp\n", (mmi->segu));
 655
 656 //
 657 // locked block of all memory until we punch out free space
 658 //
 659         //printf("              newblock making!\n");
 660         MM_GetNewBlock(mm);
 661         mm->mmhead = mm->mmnew;                         // this will allways be the first node
 662         mm->mmnew->start = 0;
 663         mm->mmnew->length = 0xffff;
 664         mm->mmnew->attributes = LOCKBIT;
 665         mm->mmnew->next = NULL;
 666         mm->mmrover = mm->mmhead;
 667         printf("mmi->segu=%Fp\n", (mmi->segu));
 668
 669 //
 670 // get all available near conventional memory segments
 671 //
 672         //printf("              nearheap making!\n");
 673 //----  length=coreleft();
 674         //_nheapgrow();
 675         length=_memmax();
 676         start = /*(void *)*/(mm->nearheap = _nmalloc(length));
 677         length -= 16-(FP_OFF(start)&15);
 678         length -= SAVENEARHEAP;
 679         seglength = length / 16;                        // now in paragraphs
 680         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 681         MML_UseSpace(segstart,seglength, mm);
 682         mmi->nearheap = length;
 683         /*switch( _nheapchk() ) {
 684                 case _HEAPOK:
 685                         printf( "OK - nearheap is good\n" );
 686                 break;
 687                 case _HEAPEMPTY:
 688                         printf( "OK - nearheap is empty\n" );
 689                 break;
 690                 case _HEAPBADBEGIN:
 691                         printf( "ERROR - nearheap is damaged\n" );
 692                 break;
 693                 case _HEAPBADNODE:
 694                         printf( "ERROR - bad node in nearheap\n" );
 695                 break;
 696         }*/
 697         //printf("              near heap ok!\n");
 698
 699 //
 700 // get all available far conventional memory segments
 701 //
 702 //----  length=farcoreleft();
 703         //printf("              farheap making!\n");
 704         //_fheapgrow();
 705         length=0xffffUL*4UL;//_memavl();
 706         start = mm->farheap = halloc(length, sizeof(byte));
 707         //start = mm->farheap = _fmalloc(length);
 708         length -= 16-(FP_OFF(start)&15);
 709         length -= SAVEFARHEAP;
 710         seglength = length / 16;                        // now in paragraphs
 711         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 712         MML_UseSpace(segstart,seglength, mm);
 713         mmi->farheap = length;
 714         mmi->mainmem = mmi->nearheap + mmi->farheap;
 715         /*switch( _fheapchk() ) {
 716                 case _HEAPOK:
 717                         printf( "OK - farheap is good\n" );
 718                 break;
 719                 case _HEAPEMPTY:
 720                         printf( "OK - farheap is empty\n" );
 721                 break;
 722                 case _HEAPBADBEGIN:
 723                         printf( "ERROR - farheap is damaged\n" );
 724                 break;
 725                 case _HEAPBADNODE:
 726                         printf( "ERROR - bad node in farheap\n" );
 727                 break;
 728         }*/
 729         //printf("              far heap ok!\n");
 730
 731 //
 732 // detect EMS and allocate up to 64K at page frame
 733 //
 734 printf("                EMS1\n");
 735 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!
 736         mmi->EMSmem = 0;
 737         for(i = 1;i < __argc;i++)
 738         {
 739                 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 740                         goto emsskip;                           // param NOEMS
 741         }
 742 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!
 743         if(MML_CheckForEMS())
 744         {
 745 printf("                EMS2\n");
 746 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!
 747                 MML_SetupEMS(mm);                                       // allocate space
 748 printf("                EMS3\n");
 749 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!
 750                 //TODO: EMS4! AND EMS 3.2 MASSIVE DATA HANDLMENT!
 751                 MML_UseSpace(mm->EMSpageframe,(MAPPAGES)*0x4000lu, mm);
 752 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!
 753 printf("                EMS4\n");
 754                 //if(mm->EMSVer<0x40)
 755                         MM_MapEMS(mm, mmi);                                     // map in used pages
 756                 //else
 757                         //MM_MapXEMS(mm, mmi);                                  // map in used pages
 758         }
 759
 760 //
 761 // detect XMS and get upper memory blocks
 762 //
 763 emsskip:
 764         mmi->XMSmem = 0;
 765         for(i = 1;i < __argc;i++)
 766         {
 767                 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 768                         goto xmsskip;                           // param NOXMS
 769         }
 770 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!
 771         if(MML_CheckForXMS(mm))
 772         {
 773 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!
 774 printf("                XMS!\n");
 775                 //++++          MML_SetupXMS(mm, mmi);                                  // allocate as many UMBs as possible
 776         }
 777
 778 //
 779 // allocate the misc buffer
 780 //
 781 xmsskip:
 782 /*mmi->nearheap = 0;
 783 mmi->farheap = 0;
 784 mmi->EMSmem = 0;
 785 mmi->XMSmem = 0;*/
 786         mm->mmrover = mm->mmhead;               // start looking for space after low block
 787
 788         MM_GetPtr(&(mm->bufferseg),BUFFERSIZE, mm, mmi);
 789 }
 790
 791 //==========================================================================
 792
 793 /*
 794 ====================
 795 =
 796 = MM_Shutdown
 797 =
 798 = Frees all conventional, EMS, and XMS allocated
 799 =
 800 ====================
 801 */
 802
 803 void MM_Shutdown(mminfo_t *mm)
 804 {
 805         if(!(mm->mmstarted))
 806                 return;
 807
 808         _ffree(mm->farheap);
 809         printf("                far freed\n");
 810         free(mm->nearheap);
 811         printf("                near freed\n");
 812         //hfree(mm->hugeheap);
 813         //printf("huge freed\n");
 814         if(MML_CheckForEMS()){ MML_ShutdownEMS(mm); printf("            EMS freed\n"); }
 815         if(MML_CheckForXMS(mm)){ MML_ShutdownXMS(mm); printf("          XMS freed\n"); }
 816 }
 817
 818 //==========================================================================
 819
 820 /*
 821 ====================
 822 =
 823 = MM_GetPtr
 824 =
 825 = Allocates an unlocked, unpurgable block
 826 =
 827 ====================
 828 */
 829
 830 void MM_GetPtr(memptr *baseptr,dword size, mminfo_t *mm, mminfotype *mmi)
 831 {
 832         mmblocktype huge *scan,huge *lastscan,huge *endscan,huge *purge,huge *next;
 833         int                     search;
 834         unsigned        needed,startseg;
 835
 836         needed = (size+15)/16;          // convert size from bytes to paragraphs
 837
 838         MM_GetNewBlock(mm);                             // fill in start and next after a spot is found
 839         mm->mmnew->length = needed;
 840         mm->mmnew->useptr = baseptr;
 841         mm->mmnew->attributes = BASEATTRIBUTES;
 842
 843         for(search = 0; search<3; search++)
 844         {
 845         //
 846         // first search:        try to allocate right after the rover, then on up
 847         // second search:       search from the head pointer up to the rover
 848         // third search:        compress memory, then scan from start
 849                 if(search == 1 && mm->mmrover == mm->mmhead)
 850                         search++;
 851
 852                 switch(search)
 853                 {
 854                 case 0:
 855                         lastscan = mm->mmrover;
 856                         scan = mm->mmrover->next;
 857                         endscan = NULL;
 858                         break;
 859                 case 1:
 860                         lastscan = mm->mmhead;
 861                         scan = mm->mmhead->next;
 862                         endscan = mm->mmrover;
 863                         break;
 864                 case 2:
 865                         MM_SortMem(mm);
 866                         lastscan = mm->mmhead;
 867                         scan = mm->mmhead->next;
 868                         endscan = NULL;
 869                         break;
 870                 }
 871
 872                 startseg = lastscan->start + lastscan->length;
 873
 874                 while(scan != endscan)
 875                 {
 876                         if(scan->start - startseg >= needed)
 877                         {
 878                         //
 879                         // got enough space between the end of lastscan and
 880                         // the start of scan, so throw out anything in the middle
 881                         // and allocate the new block
 882                         //
 883                                 purge = lastscan->next;
 884                                 lastscan->next = mm->mmnew;
 885                                 mm->mmnew->start = *(unsigned *)baseptr = startseg;
 886                                 mm->mmnew->next = scan;
 887                                 while(purge != scan)
 888                                 {       // free the purgable block
 889                                         next = purge->next;
 890                                         MM_FreeBlock(purge, mm);
 891                                         purge = next;           // purge another if not at scan
 892                                 }
 893                                 mm->mmrover = mm->mmnew;
 894                                 return; // good allocation!
 895                         }
 896
 897                         //
 898                         // if this block is purge level zero or locked, skip past it
 899                         //
 900                         if((scan->attributes & LOCKBIT)
 901                                 || !(scan->attributes & PURGEBITS) )
 902                         {
 903                                 lastscan = scan;
 904                                 startseg = lastscan->start + lastscan->length;
 905                         }
 906
 907
 908                         scan=scan->next;                // look at next line
 909                 }
 910         }
 911
 912         if (mm->bombonerror)
 913                 printf(OUT_OF_MEM_MSG,(size-mmi->nearheap));
 914         else
 915                 mm->mmerror = true;
 916 }
 917
 918 //==========================================================================
 919
 920 /*
 921 ====================
 922 =
 923 = MM_FreePtr
 924 =
 925 = Allocates an unlocked, unpurgable block
 926 =
 927 ====================
 928 */
 929
 930 void MM_FreePtr(memptr *baseptr, mminfo_t *mm)
 931 {
 932         mmblocktype huge *scan,huge *last;
 933
 934         last = mm->mmhead;
 935         scan = last->next;
 936
 937         if(baseptr == mm->mmrover->useptr)      // removed the last allocated block
 938                 mm->mmrover = mm->mmhead;
 939
 940         while(scan->useptr != baseptr && scan)
 941         {
 942                 last = scan;
 943                 scan = scan->next;
 944         }
 945
 946         if(!scan)
 947         {
 948                 printf("MM_FreePtr: Block not found!\n");
 949                 return;
 950         }
 951
 952         last->next = scan->next;
 953
 954         MM_FreeBlock(scan, mm);
 955 }
 956 //==========================================================================
 957
 958 /*
 959 =====================
 960 =
 961 = MM_SetPurge
 962 =
 963 = Sets the purge level for a block (locked blocks cannot be made purgable)
 964 =
 965 =====================
 966 */
 967
 968 void MM_SetPurge(memptr *baseptr, int purge, mminfo_t *mm)
 969 {
 970         mmblocktype huge *start;
 971
 972         start = mm->mmrover;
 973
 974         do
 975         {
 976                 if(mm->mmrover->useptr == baseptr)
 977                         break;
 978
 979                 mm->mmrover = mm->mmrover->next;
 980
 981                 if(!mm->mmrover)
 982                         mm->mmrover = mm->mmhead;
 983                 else if(mm->mmrover == start)
 984                 {
 985                         printf("MM_SetPurge: Block not found!");
 986                         return;
 987                 }
 988
 989         } while(1);
 990
 991         mm->mmrover->attributes &= ~PURGEBITS;
 992         mm->mmrover->attributes |= purge;
 993 }
 994
 995 //==========================================================================
 996
 997 /*
 998 =====================
 999 =
1000 = MM_SetLock
1001 =
1002 = Locks / unlocks the block
1003 =
1004 =====================
1005 */
1006
1007 void MM_SetLock(memptr *baseptr, boolean locked, mminfo_t *mm)
1008 {
1009         mmblocktype huge *start;
1010
1011         start = mm->mmrover;
1012
1013         do
1014         {
1015                 if(mm->mmrover->useptr == baseptr)
1016                         break;
1017
1018                 mm->mmrover = mm->mmrover->next;
1019
1020                 if(!mm->mmrover)
1021                         mm->mmrover = mm->mmhead;
1022                 else if(mm->mmrover == start)
1023                 {
1024                         printf("MM_SetLock: Block not found!");
1025                         return;
1026                 }
1027
1028         } while(1);
1029
1030         mm->mmrover->attributes &= ~LOCKBIT;
1031         mm->mmrover->attributes |= locked*LOCKBIT;
1032 }
1033
1034 //==========================================================================
1035
1036 /*
1037 =====================
1038 =
1039 = MM_SortMem
1040 =
1041 = Throws out all purgable stuff and compresses movable blocks
1042 =
1043 =====================
1044 */
1045
1046 void MM_SortMem(mminfo_t *mm)
1047 {
1048         mmblocktype huge *scan,huge *last,huge *next;
1049         unsigned        start,length,source,dest,oldborder;
1050         int                     playing;
1051
1052         //
1053         // lock down a currently playing sound
1054         //
1055 /*++++  playing = SD_SoundPlaying ();
1056         if(playing)
1057         {
1058                 switch (SoundMode)
1059                 {
1060                 case sdm_PC:
1061                         playing += STARTPCSOUNDS;
1062                         break;
1063                 case sdm_AdLib:
1064                         playing += STARTADLIBSOUNDS;
1065                         break;
1066                 }
1067                 MM_SetLock(&(memptr)audiosegs[playing],true);
1068         }
1069
1070
1071         SD_StopSound();*/
1072 //      oldborder = bordercolor;
1073 //      VW_ColorBorder (15);
1074
1075         if(beforesort)
1076                 beforesort();
1077
1078         scan = mm->mmhead;
1079
1080         last = NULL;            // shut up compiler warning
1081
1082         while(scan)
1083         {
1084                 if(scan->attributes & LOCKBIT)
1085                 {
1086                 //
1087                 // block is locked, so try to pile later blocks right after it
1088                 //
1089                         start = scan->start + scan->length;
1090                 }
1091                 else
1092                 {
1093                         if(scan->attributes & PURGEBITS)
1094                         {
1095                         //
1096                         // throw out the purgable block
1097                         //
1098                                 next = scan->next;
1099                                 MM_FreeBlock(scan, mm);
1100                                 last->next = next;
1101                                 scan = next;
1102                                 continue;
1103                         }
1104                         else
1105                         {
1106                         //
1107                         // push the non purgable block on top of the last moved block
1108                         //
1109                                 if(scan->start != start)
1110                                 {
1111                                         length = scan->length;
1112                                         source = scan->start;
1113                                         dest = start;
1114                                         while(length > 0xf00)
1115                                         {
1116                                                 movedata(source,0,dest,0,0xf00*16);
1117                                                 length -= 0xf00;
1118                                                 source += 0xf00;
1119                                                 dest += 0xf00;
1120                                         }
1121                                         movedata(source,0,dest,0,length*16);
1122
1123                                         scan->start = start;
1124                                         *(unsigned *)scan->useptr = start;
1125                                 }
1126                                 start = scan->start + scan->length;
1127                         }
1128                 }
1129
1130                 last = scan;
1131                 scan = scan->next;              // go to next block
1132         }
1133
1134         mm->mmrover = mm->mmhead;
1135
1136         if(aftersort)
1137                 aftersort();
1138
1139 //      VW_ColorBorder (oldborder);
1140
1141 /*++++  if(playing)
1142                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
1143 }
1144
1145
1146 //==========================================================================
1147
1148 //****#if 0
1149 /*
1150 =====================
1151 =
1152 = MM_ShowMemory
1153 =
1154 =====================
1155 */
1156
1157 void MM_ShowMemory(/*page_t *page, */mminfo_t *mm)
1158 {
1159         mmblocktype huge *scan;
1160         word color,temp;
1161         long    end,owner;
1162         word chx,chy;
1163         byte    scratch[160],str[16];
1164
1165 //****  VW_SetDefaultColors();
1166 //****  VW_SetLineWidth(40);
1167 //++++mh        temp = bufferofs;
1168 //++++mh        bufferofs = 0;
1169 //****  VW_SetScreen (0,0);
1170
1171         scan = mm->mmhead;
1172
1173         end = -1;
1174
1175 CA_OpenDebug ();
1176
1177         chx=0;
1178         chy=0;
1179
1180         while(scan)
1181         {
1182                 if(scan->attributes & PURGEBITS)
1183                         color = 5;              // dark purple = purgable
1184                 else
1185                         color = 9;              // medium blue = non purgable
1186                 if(scan->attributes & LOCKBIT)
1187                         color = 12;             // red = locked
1188                 if(scan->start<=end)
1189                 {
1190                         //printf(");
1191                         write(debughandle,"\nMM_ShowMemory: Memory block order currupted!\n",strlen("\nMM_ShowMemory: Memory block order currupted!\n"));
1192                         //modexprint(&page, chx, chy, 1, 0, 24, "\nMM_ShowMemory: Memory block order currupted!\n");
1193                         return;
1194                 }
1195                 end = scan->start+scan->length-1;
1196                 chy = scan->start/320;
1197                 chx = scan->start%320;
1198                                 //modexhlin(page, scan->start, (unsigned)end, chy, color);
1199                                 //for(chx=scan->start;chx+4>=(word)end;chx+=4)
1200                                 //{
1201 //++++                                  modexClearRegion(page, chx, chy, 4, 4, color);
1202                                 //}
1203
1204 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1205
1206 //++++          VW_Plot(scan->start,0,15);
1207 //++++                          modexClearRegion(page, chx, chy, 4, 4, 15);
1208                 if(scan->next->start > end+1)
1209 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1210                         //for(chx=scan->next->start;chx+4>=(word)end+1;chx+=4)
1211                         //{
1212 //++++                          chx+=scan->next->start;
1213 //++++                          modexClearRegion(page, chx, chy, 4, 4, 2);
1214                         //}
1215                                         //modexhlin(page, end+1,scan->next->start, chy, 0);
1216
1217 /*
1218                 end = scan->length-1;
1219                 y = scan->start/320;
1220                 x = scan->start%320;
1221                 VW_Hlin(x,x+end,y,color);
1222                 VW_Plot(x,y,15);
1223                 if (scan->next && scan->next->start > end+1)
1224                         VW_Hlin(x+end+1,x+(scan->next->start-scan->start),y,0); // black = free
1225 */
1226
1227 //****#if 0
1228 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!
1229 strcpy(scratch,"Seg:");
1230 ultoa (scan->start,str,16);
1231 strcat (scratch,str);
1232 strcat (scratch,"\tSize:");
1233 ltoa ((dword)scan->length*16,str,10);
1234 strcat (scratch,str);
1235 strcat (scratch,"\tOwner:0x");
1236 owner = (unsigned)scan->useptr;
1237 ultoa (owner,str,16);
1238 strcat (scratch,str);
1239 strcat (scratch,"\n");
1240 write(debughandle,scratch,strlen(scratch));
1241 //modexprint(page, chx, chy, 1, 0, 24, &scratch);
1242 //++++chy+=4;
1243 //fprintf(stdout, "%s", scratch);
1244 //****#endif
1245
1246                 scan = scan->next;
1247         }
1248
1249 CA_CloseDebug ();
1250
1251 //++++mh        IN_Ack();
1252 //****  VW_SetLineWidth(64);
1253 //++++mh        bufferofs = temp;
1254 }
1255 //****#endif
1256
1257 //==========================================================================
1258
1259 /*
1260 =====================
1261 =
1262 = MM_DumpData
1263 =
1264 =====================
1265 */
1266
1267 void MM_DumpData(mminfo_t *mm)
1268 {
1269         mmblocktype far *scan,far *best;
1270         long    lowest,oldlowest;
1271         word    owner;
1272         byte    lock,purge;
1273         FILE    *dumpfile;
1274
1275
1276         //++++free(mm->nearheap);
1277         dumpfile = fopen ("mmdump.txt","w");
1278         if (!dumpfile){
1279                 printf("MM_DumpData: Couldn't open MMDUMP.TXT!\n");
1280                 return;
1281         }
1282
1283         lowest = -1;
1284         do
1285         {
1286                 oldlowest = lowest;
1287                 lowest = 0xffff;
1288
1289                 scan = mm->mmhead;
1290                 while (scan)
1291                 {
1292                         owner = (word)scan->useptr;
1293
1294                         if (owner && owner<lowest && owner > oldlowest)
1295                         {
1296                                 best = scan;
1297                                 lowest = owner;
1298                         }
1299
1300                         scan = scan->next;
1301                 }
1302
1303                 if (lowest != 0xffff)
1304                 {
1305                         if (best->attributes & PURGEBITS)
1306                                 purge = 'P';
1307                         else
1308                                 purge = '-';
1309                         if (best->attributes & LOCKBIT)
1310                                 lock = 'L';
1311                         else
1312                                 lock = '-';
1313                         fprintf (dumpfile,"0x%p (%c%c) = %u\n"
1314                         ,(word)lowest,lock,purge,best->length);
1315                 }
1316
1317         } while (lowest != 0xffff);
1318
1319         fclose(dumpfile);
1320         printf("MMDUMP.TXT created.\n");
1321 }
1322
1323 //==========================================================================
1324
1325
1326 /*
1327 ======================
1328 =
1329 = MM_UnusedMemory
1330 =
1331 = Returns the total free space without purging
1332 =
1333 ======================
1334 */
1335
1336 dword MM_UnusedMemory(mminfo_t *mm)
1337 {
1338         dword free;
1339         mmblocktype huge *scan;
1340
1341         free = 0;
1342         scan = mm->mmhead;
1343
1344         while(scan->next)
1345         {
1346                 free += scan->next->start - (scan->start + scan->length);
1347                 scan = scan->next;
1348         }
1349
1350         return free*16l;
1351 //      return free;
1352 }
1353
1354 //==========================================================================
1355
1356
1357 /*
1358 ======================
1359 =
1360 = MM_TotalFree
1361 =
1362 = Returns the total free space with purging
1363 =
1364 ======================
1365 */
1366
1367 dword MM_TotalFree(mminfo_t *mm)
1368 {
1369         dword free;
1370         mmblocktype huge *scan;
1371
1372         free = 0;
1373         scan = mm->mmhead;
1374
1375         while(scan->next)
1376         {
1377                 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1378                         free += scan->length;
1379                 free += scan->next->start - (scan->start + scan->length);
1380                 scan = scan->next;
1381         }
1382
1383         return free*16l;
1384 //      return free;
1385 }
1386
1387 //==========================================================================
1388
1389 /*
1390 =====================
1391 =
1392 = MM_Report
1393 =
1394 =====================
1395 */
1396
1397 void MM_Report(/*page_t *page, */mminfo_t *mm, mminfotype *mmi)
1398 {
1399         if(MML_CheckForEMS())
1400         {
1401                 printf("EMM v%x.%x available\n", mm->EMSVer>>4,mm->EMSVer&0x0F);
1402                 printf("totalEMSpages=%u\n", mm->totalEMSpages);
1403                 printf("freeEMSpages=%u\n", mm->freeEMSpages);
1404                 printf("EMSpageframe=%x\n", mm->EMSpageframe);
1405         }
1406         if(MML_CheckForXMS(mm)) printf("XMSaddr=%Fp\n", *XMSaddr);
1407         printf("near=%lu\n", mmi->nearheap);
1408         printf("far=%lu\n", mmi->farheap);
1409         printf("EMSmem=%lu\n", mmi->EMSmem);
1410         printf("XMSmem=%lu\n", mmi->XMSmem);
1411         printf("mainmem=%lu\n", mmi->mainmem);
1412         printf("UnusedMemory=%lu\n", MM_UnusedMemory(mm));
1413         printf("TotalFree=%lu\n", MM_TotalFree(mm));
1414 //      printf("\n");
1415 //      printf("UnusedMemory=%lu kb\n", MM_UnusedMemory()/10248);
1416 //      printf("TotalFree=%lu kb\n", MM_TotalFree()/10248);
1417 }
1418
1419 //==========================================================================
1420
1421 /*
1422 =====================
1423 =
1424 = MM_EMSerr
1425 =
1426 =====================
1427 */
1428
1429 void MM_EMSerr(byte *stri, byte err)
1430 {
1431         //Returns a text string describing the error code in EMS.Error.
1432         switch(err)
1433         {
1434                 case 0x0:
1435                         strcat(stri, "successful");
1436                 break;
1437                 case 0x80:
1438                         strcat(stri, "internal error");
1439                 break;
1440                 case 0x81:
1441                         strcat(stri, "hardware malfunction");
1442                 break;
1443                 case 0x82:
1444                         strcat(stri, "busy .. retry later");
1445                 break;
1446                 case 0x83:
1447                         strcat(stri, "invalid handle");
1448                 break;
1449                 case 0x84:
1450                         strcat(stri, "undefined function requested by application");
1451                 break;
1452                 case 0x85:
1453                         strcat(stri, "no more handles available");
1454                 break;
1455                 case 0x86:
1456                         strcat(stri, "error in save or restore of mapping context");
1457                 break;
1458                 case 0x87:
1459                         strcat(stri, "insufficient memory pages in system");
1460                 break;
1461                 case 0x88:
1462                         strcat(stri, "insufficient memory pages available");
1463                 break;
1464                 case 0x89:
1465                         strcat(stri, "zero pages requested");
1466                 break;
1467                 case 0x8A:
1468                         strcat(stri, "invalid logical page number encountered");
1469                 break;
1470                 case 0x8B:
1471                         strcat(stri, "invalid physical page number encountered");
1472                 break;
1473                 case 0x8C:
1474                         strcat(stri, "page-mapping hardware state save area is full");
1475                 break;
1476                 case 0x8D:
1477                         strcat(stri, "save of mapping context failed");
1478                 break;
1479                 case 0x8E:
1480                         strcat(stri, "restore of mapping context failed");
1481                 break;
1482                 case 0x8F:
1483                         strcat(stri, "undefined subfunction");
1484                 break;
1485                 case 0x90:
1486                         strcat(stri, "undefined attribute type");
1487                 break;
1488                 case 0x91:
1489                         strcat(stri, "feature not supported");
1490                 break;
1491                 case 0x92:
1492                         strcat(stri, "successful, but a portion of the source region has been overwritten");
1493                 break;
1494                 case 0x93:
1495                         strcat(stri, "length of source or destination region exceeds length of region allocated to either source or destination handle");
1496                 break;
1497                 case 0x94:
1498                         strcat(stri, "conventional and expanded memory regions overlap");
1499                 break;
1500                 case 0x95:
1501                         strcat(stri, "offset within logical page exceeds size of logical page");
1502                 break;
1503                 case 0x96:
1504                         strcat(stri, "region length exceeds 1 MB");
1505                 break;
1506                 case 0x97:
1507                         strcat(stri, "source and destination EMS regions have same handle and overlap");
1508                 break;
1509                 case 0x98:
1510                         strcat(stri, "memory source or destination type undefined");
1511                 break;
1512                 case 0x9A:
1513                         strcat(stri, "specified alternate map register or DMA register set not supported");
1514                 break;
1515                 case 0x9B:
1516                         strcat(stri, "all alternate map register or DMA register sets currently allocated");
1517                 break;
1518                 case 0x9C:
1519                         strcat(stri, "alternate map register or DMA register sets not supported");
1520                 break;
1521                 case 0x9D:
1522                         strcat(stri, "undefined or unallocated alternate map register or DMA register set");
1523                 break;
1524                 case 0x9E:
1525                         strcat(stri, "dedicated DMA channels not supported");
1526                 break;
1527                 case 0x9F:
1528                         strcat(stri, "specified dedicated DMA channel not supported");
1529                 break;
1530                 case 0xA0:
1531                         strcat(stri, "no such handle name");
1532                 break;
1533                 case 0xA1:
1534                         strcat(stri, "a handle found had no name, or duplicate handle name");
1535                 break;
1536                 case 0xA2:
1537                         strcat(stri, "attempted to wrap around 1M conventional address space");
1538                 break;
1539                 case 0xA3:
1540                         strcat(stri, "source array corrupted");
1541                 break;
1542                 case 0xA4:
1543                         strcat(stri, "operating system denied access");
1544                 break;
1545                 default:
1546                         strcat(stri, "undefined error");
1547         }
1548 }
1549
1550 //==========================================================================
1551
1552 /*
1553 =====================
1554 =
1555 = MM_BombOnError
1556 =
1557 =====================
1558 */
1559
1560 void MM_BombOnError(boolean bomb, mminfo_t *mm)
1561 {
1562         mm->bombonerror = bomb;
1563 }
1564
1565 void MM_GetNewBlock(mminfo_t *mm)
1566 {
1567         if(!mm->mmfree)
1568                 MML_ClearBlock(mm);
1569         mm->mmnew=mm->mmfree;
1570         mm->mmfree=mm->mmfree->next;
1571         /*if(!(mm->mmnew=mm->mmfree))
1572         {
1573                 printf("MM_GETNEWBLOCK: No free blocks!");
1574                 return;
1575         }
1576         mm->mmfree=mm->mmfree->next;*/
1577 }
1578
1579 void MM_FreeBlock(mmblocktype *x, mminfo_t *mm)
1580 {
1581         x->useptr=NULL;
1582         x->next=mm->mmfree;
1583         mm->mmfree=x;
1584 }
1585
1586 void MM_seguin(void)
1587 {
1588         __asm
1589         {
1590                 push    ds
1591                 mov     ax,ds
1592                 inc             ax
1593                 mov     ds,ax
1594         }
1595 }
1596
1597 void MM_segude(void)
1598 {
1599         __asm
1600         {
1601                 pop ds
1602         }
1603 }
1604
1605 /*
1606 pull data from far and put it into ds var
1607 mov ax,es:si
1608 mov x,ax
1609 */
1610 /*
1611 ss stack segment
1612 sp top of stack
1613 bp bottem of stack
1614 */