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 #pragma hdrstop
  51
  52 #pragma warn -pro
  53 #pragma warn -use
  54
  55 /*
  56 =============================================================================
  57
  58                                                  GLOBAL VARIABLES
  59
  60 =============================================================================
  61 */
  62
  63 void            (* beforesort) (void);
  64 void            (* aftersort) (void);
  65 void            (* XMSaddr) (void);             // far pointer to XMS driver
  66
  67 /*
  68 =============================================================================
  69
  70                                                  LOCAL VARIABLES
  71
  72 =============================================================================
  73 */
  74
  75 static  char *ParmStringsexmm[] = {"noems","noxms",""};
  76
  77 /*
  78 ======================
  79 =
  80 = MML_CheckForEMS
  81 =
  82 = Routine from p36 of Extending DOS
  83 =
  84 =======================
  85 */
  86
  87 boolean MML_CheckForEMS(void)
  88 {
  89         boolean emmcfems;
  90         static char     emmname[] = "EMMXXXX0"; //fix by andrius4669
  91 //              mov     dx,OFFSET emmname
  92         __asm {
  93                 mov     dx,OFFSET emmname       //fix by andrius4669
  94                 mov     ax,0x3d00
  95                 int     0x21            // try to open EMMXXXX0 device
  96                 jc      error
  97
  98                 mov     bx,ax
  99                 mov     ax,0x4400
 100
 101                 int     0x21            // get device info
 102                 jc      error
 103
 104                 and     dx,0x80
 105                 jz      error
 106
 107                 mov     ax,0x4407
 108
 109                 int     0x21            // get status
 110                 jc      error
 111                 or      al,al
 112                 jz      error
 113
 114                 mov     ah,0x3e
 115                 int     0x21            // close handle
 116                 jc      error
 117                 //
 118                 // EMS is good
 119                 //
 120                 mov     emmcfems,1
 121                 jmp End
 122 #ifdef __BORLANDC__
 123         }
 124 #endif
 125                 error:
 126 #ifdef __BORLANDC__
 127         __asm {
 128 #endif
 129                 //
 130                 // EMS is bad
 131                 //
 132                 mov     emmcfems,0
 133 #ifdef __BORLANDC__
 134         }
 135 #endif
 136                 End:
 137 #ifdef __WATCOMC__
 138         }
 139 #endif
 140         return(emmcfems);
 141 }
 142
 143
 144 /*
 145 ======================
 146 =
 147 = MML_SetupEMS
 148 =
 149 =======================
 150 */
 151
 152 byte MML_SetupEMS(mminfo_t *mm)
 153 {
 154         byte    str[160];
 155         byte    err;
 156         boolean errorflag=false;
 157
 158         unsigned int EMSVer = 0;
 159         //byte  EMS_status;
 160         unsigned        totalEMSpages,freeEMSpages,EMSpageframe,EMSpagesmapped,EMShandle;
 161         totalEMSpages = freeEMSpages = EMSpageframe = EMSpagesmapped = 0;
 162
 163         __asm {
 164                 mov     ah,EMS_STATUS
 165                 int     EMS_INT                                         // make sure EMS hardware is present
 166                 or      ah,ah
 167                 //mov   [EMS_status],ah
 168                 jnz     error
 169
 170                 mov     ah,EMS_VERSION
 171                 int     EMS_INT
 172                 or      ah,ah
 173                 jnz     error
 174                 mov     [EMSVer],ax                             //      set EMSVer
 175                 cmp     al,0x32                                         // only work on ems 3.2 or greater
 176                 jb      error
 177
 178                 mov     ah,EMS_GETFRAME
 179                 int     EMS_INT                                         // find the page frame address
 180                 or      ah,ah
 181                 jnz     error
 182                 mov     [EMSpageframe],bx
 183
 184                 mov     ah,EMS_GETPAGES
 185                 int     EMS_INT                                         // find out how much EMS is there
 186                 or      ah,ah
 187                 jnz     error
 188                 mov     [totalEMSpages],dx
 189                 mov     [freeEMSpages],bx
 190                 or      bx,bx
 191                 jz      noEMS                                           // no EMS at all to allocate
 192                                                                                         //EXPAND DONG!!!!
 193                 cmp     [EMSVer],0x40
 194                 jb      low
 195                 cmp     bx,[freeEMSpages]
 196                 jle     getpages
 197                 mov     bx,[freeEMSpages]
 198                 jmp     getpages
 199 #ifdef __BORLANDC__
 200         }
 201 #endif
 202         low:
 203 #ifdef __BORLANDC__
 204         __asm {
 205 #endif
 206                 cmp     bx,4
 207                 jle     getpages                                        // there is only 1,2,3,or 4 pages
 208                 mov     bx,4                                            // we can't use more than 4 pages
 209 #ifdef __BORLANDC__
 210         }
 211 #endif
 212         getpages:
 213 #ifdef __BORLANDC__
 214         __asm {
 215 #endif
 216                 mov     [EMSpagesmapped],bx
 217                 mov     ah,EMS_ALLOCPAGES                       // allocate up to 64k of EMS
 218                 int     EMS_INT
 219                 or      ah,ah
 220                 jnz     error
 221                 mov     [EMShandle],dx
 222                 jmp End
 223 #ifdef __BORLANDC__
 224         }
 225 #endif
 226         error:
 227 #ifdef __BORLANDC__
 228         __asm {
 229 #endif
 230                 mov     err,ah
 231                 mov     errorflag,1
 232                 jmp End
 233 #ifdef __BORLANDC__
 234         }
 235 #endif
 236 noEMS:
 237 End:
 238 #ifdef __WATCOMC__
 239         }
 240 #endif
 241         if(errorflag==true)
 242         {
 243                 strcpy(str,"MM_SetupEMS: EMS error ");
 244                 MM_EMSerr(str, err);
 245                 printf("%s\n",str);
 246                 return err;
 247         }
 248         mm->totalEMSpages=totalEMSpages;
 249         mm->freeEMSpages=freeEMSpages;
 250         mm->EMSpageframe=EMSpageframe;
 251         mm->EMSpagesmapped=EMSpagesmapped;
 252         mm->EMShandle=EMShandle;
 253         mm->EMSVer=EMSVer;
 254         return 0;
 255 }
 256
 257
 258 /*
 259 ======================
 260 =
 261 = MML_ShutdownEMS
 262 =
 263 =======================
 264 */
 265
 266 void MML_ShutdownEMS(mminfo_t *mm)
 267 {
 268         boolean errorflag=false;
 269         unsigned EMShandle=mm->EMShandle;
 270
 271         if(!EMShandle)
 272                 return;
 273         __asm {
 274                 mov     ah,EMS_FREEPAGES
 275                 mov     dx,[EMShandle]
 276                 int     EMS_INT
 277                 or      ah,ah
 278                 jz      ok
 279                 mov     errorflag,1
 280 #ifdef __BORLANDC__
 281         }
 282 #endif
 283                 ok:
 284 #ifdef __WATCOMC__
 285         }
 286 #endif
 287         if(errorflag==true) printf("MML_ShutdownEMS: Error freeing EMS!\n");    //++++ add something
 288 }
 289
 290 /*
 291 ====================
 292 =
 293 = MM_MapEMS
 294 =
 295 = Maps the 64k of EMS used by memory manager into the page frame
 296 = for general use.  This only needs to be called if you are keeping
 297 = other things in EMS.
 298 =
 299 ====================
 300 */
 301
 302 byte MM_MapEMS(mminfo_t *mm, mminfotype *mmi)
 303 {
 304         byte    str[160];
 305         unsigned        EMShandle;
 306         byte err;
 307         boolean errorflag=false;
 308         int     i;
 309         EMShandle=mm->EMShandle;
 310
 311         for (i=0;i<4/*MAPPAGES*/;i++)
 312         {
 313                 __asm {
 314                         mov     ah,EMS_MAPPAGE
 315                         mov     bx,[i]                  // logical page
 316                         mov     al,bl                   // physical page
 317                         mov     dx,[EMShandle]  // handle
 318                         int     EMS_INT
 319                         or      ah,ah
 320                         jnz     error
 321                         jmp End
 322 #ifdef __BORLANDC__
 323                 }
 324 #endif
 325                         error:
 326 #ifdef __BORLANDC__
 327                 __asm {
 328 #endif
 329                         mov     err,ah
 330                         mov     errorflag,1
 331 #ifdef __BORLANDC__
 332                 }
 333 #endif
 334                         End:
 335 #ifdef __WATCOMC__
 336                 }
 337 #endif
 338                 if(errorflag==true)
 339                 {
 340                         strcpy(str,"MM_MapEMS: EMS error ");
 341                         MM_EMSerr(str, err);
 342                         printf("%s\n",str);
 343                         return err;
 344                 }
 345         }
 346         mmi->EMSmem = (i)*0x4000lu;
 347         //printf("              mmi->EMSmem=%lu\n", mmi->EMSmem);
 348         return 0;
 349 }
 350
 351 byte MM_MapXEMS(mminfo_t *mm, mminfotype *mmi)
 352 {
 353 //SUB EMS.MapXPages (PhysicalStart, LogicalStart, NumPages, Handle)
 354
 355         //Maps up to 4 logical EMS pages to physical pages in the page frame, where:
 356         //PhysicalStart = Physical page first logical page is mapped to
 357         //LogicalStart  = First logical page to map
 358         //NumPages      = Number of pages to map (1 to 4)
 359         //Handle        = EMS handle logical pages are allocated to
 360
 361   /*//Create a buffer containing the page information
 362 //  FOR x = 0 TO NumPages - 1
 363 //    MapInfo$ = MapInfo$ + MKI$(LogicalStart + x) + MKI$(PhysicalStart + x)
 364 //  NEXT*/
 365
 366 //  Regs.ax = 0x5000                           //Map the pages in the buffer
 367 //  Regs.cx = NumPages                         //to the pageframe
 368 //  Regs.dx = Handle
 369 //  Regs.ds = VARSEG(MapInfo$)
 370 //  Regs.si = SADD(MapInfo$)
 371 //  InterruptX 0x67, Regs, Regs
 372 //      EMS.Error = (Regs.ax AND 0xFF00&) \ 0x100  //Store the status code
 373
 374 //END SUB
 375         byte    str[160];
 376         byte err;
 377         word    EMShandle;
 378         boolean errorflag=false;
 379         int     i;
 380         EMShandle=mm->EMShandle;
 381
 382         if(mm->EMSVer<0x40)
 383                 return 5;
 384
 385         for (i=0;i<MAPPAGES;i++)
 386         {
 387                 __asm {
 388                         mov     ah,EMS_MAPXPAGE
 389                         mov     cx,[i]                  // logical page
 390                         mov     al,bl                   // physical page
 391                         mov     dx,[EMShandle]  // handle
 392                         int     EMS_INT
 393                         or      ah,ah
 394                         jnz     error
 395                         jmp End
 396 #ifdef __BORLANDC__
 397                 }
 398 #endif
 399                         error:
 400 #ifdef __BORLANDC__
 401                 __asm {
 402 #endif
 403                         mov     err,ah
 404                         mov     errorflag,1
 405 #ifdef __BORLANDC__
 406                 }
 407 #endif
 408                         End:
 409 #ifdef __WATCOMC__
 410                 }
 411 #endif
 412                 if(errorflag==true)
 413                 {
 414                         //strcpy(str,"MM_MapXEMS: EMS error 0x");
 415                         strcpy(str,"MM_MapXEMS: EMS error ");
 416                         //itoa(err,str2,16);
 417                         MM_EMSerr(str, err);
 418                         printf("%s\n",str);
 419                         //printf("%s%x\n",str, err);
 420                         //printf("FACK! %x\n", err);
 421                         return err;
 422                 }
 423         }
 424         mmi->EMSmem = (i)*0x4000lu;
 425         return 0;
 426 }
 427
 428 //==========================================================================
 429
 430 /*
 431 ======================
 432 =
 433 = MML_CheckForXMS
 434 =
 435 = Check for XMM driver
 436 =
 437 =======================
 438 */
 439
 440 boolean MML_CheckForXMS(mminfo_t *mm)
 441 {
 442         boolean errorflag=false;
 443         mm->numUMBs = 0;
 444
 445         __asm {
 446                 mov     ax,0x4300
 447                 int     0x2f                            // query status of installed diver
 448                 cmp     al,0x80
 449                 je      good
 450                 mov     errorflag,1
 451 #ifdef __BORLANDC__
 452         }
 453 #endif
 454                 good:
 455 #ifdef __WATCOMC__
 456         }
 457 #endif
 458         if(errorflag==true) return false;
 459         else return true;
 460 }
 461
 462
 463 /*
 464 ======================
 465 =
 466 = MML_SetupXMS
 467 =
 468 = Try to allocate all upper memory block
 469 =
 470 =======================
 471 */
 472
 473 void MML_SetupXMS(mminfo_t *mm, mminfotype *mmi)
 474 {
 475         word    base,size;
 476
 477 getmemory:
 478         __asm {
 479                 mov     ax,0x4310
 480                 int     0x2f
 481                 mov     [WORD PTR XMSaddr],bx
 482                 mov     [WORD PTR XMSaddr+2],es         // function pointer to XMS driver
 483
 484                 mov     ah,XMS_ALLOCUMB
 485                 mov     dx,0xffff                                       // try for largest block possible
 486                 //mov     ax,dx                                         // Set available Kbytes.
 487                 call    [DWORD PTR XMSaddr]
 488                 or      ax,ax
 489                 jnz     gotone
 490
 491                 cmp     bl,0xb0                                         // error: smaller UMB is available
 492                 jne     done;
 493
 494                 mov     ah,XMS_ALLOCUMB
 495                 call    [DWORD PTR XMSaddr]             // DX holds largest available UMB
 496                 or      ax,ax
 497                 jz      done                                            // another error...
 498 #ifdef __BORLANDC__
 499         }
 500 #endif
 501                 gotone:
 502 #ifdef __BORLANDC__
 503         __asm {
 504 #endif
 505                 mov     [base],bx
 506                 mov     [size],dx
 507 #ifdef __BORLANDC__
 508         }
 509 #endif
 510                 done:
 511 #ifdef __WATCOMC__
 512         }
 513 #endif
 514 //      printf("base=%u ", base); printf("size=%u\n", size);
 515         MML_UseSpace(base,size, mm);
 516         mmi->XMSmem += size*16;
 517         mm->UMBbase[mm->numUMBs] = base;
 518         mm->numUMBs++;
 519         if(mm->numUMBs < MAXUMBS)
 520                 goto getmemory;
 521 }
 522
 523
 524 /*
 525 ======================
 526 =
 527 = MML_ShutdownXMS
 528 =
 529 ======================
 530 */
 531
 532 void MML_ShutdownXMS(mminfo_t *mm)
 533 {
 534         int     i;
 535         unsigned        base;
 536
 537         for (i=0;i<mm->numUMBs;i++)
 538         {
 539                 base = mm->UMBbase[i];
 540                 __asm {
 541                         mov     ah,XMS_FREEUMB
 542                         mov     dx,[base]
 543                         call    [DWORD PTR XMSaddr]
 544                 }
 545         }
 546 }
 547
 548 //==========================================================================
 549
 550 /*
 551 ======================
 552 =
 553 = MML_UseSpace
 554 =
 555 = Marks a range of paragraphs as usable by the memory manager
 556 = This is used to mark space for the near heap, far heap, ems page frame,
 557 = and upper memory blocks
 558 =
 559 ======================
 560 */
 561
 562 void MML_UseSpace(word segstart, dword seglength, mminfo_t *mm)
 563 {
 564         mmblocktype huge *scan,huge *last;
 565         word            segm=1;
 566         word    oldend;
 567         dword           segmlen=seglength;
 568         dword           extra;
 569
 570         scan = last = mm->mmhead;
 571         mm->mmrover = mm->mmhead;               // reset rover to start of memory
 572
 573 //
 574 // search for the block that contains the range of segments
 575 //
 576         while(scan->start+scan->length < segstart)
 577         {
 578                 last = scan;
 579                 scan = scan->next;
 580         }
 581
 582         //find out how many blocks it spans!
 583         //
 584         for(;seglength>0x10000;seglength-=0xffff)
 585         {
 586                 printf("                seglen=%lu\n", seglength);
 587                 segm++;
 588         }
 589
 590 //
 591 // take the given range out of the block
 592 //
 593         oldend = scan->start + scan->length;
 594         extra = oldend - (segstart+(word)seglength);
 595         //++++emsver stuff!
 596         if(segm>1 || extra>0x10000lu)
 597         //if(extra>0xfffflu)
 598         {
 599                 scan->blob=segm;
 600                 /*__asm
 601                 {
 602                         push    ds
 603                         mov     ax,ds
 604                         inc             ax
 605                         mov     ds,ax
 606                 }*/
 607
 608
 609                 //MML_UseSpace(segstart, seglength, mm);
 610
 611                 /*__asm
 612                 {
 613                         pop ds
 614                 }*/
 615                 printf("MML_UseSpace: Segment spans two blocks!\n");
 616         //}
 617         printf("========================================\n");
 618         printf("segm=%u         ", segm);
 619         printf("ex=%lu  ", extra);
 620         printf("old=%u  ", oldend);
 621         printf("start+seglen=%lu\n", segstart+seglength);
 622         printf("segsta=%x       ", segstart);
 623         printf("len=%lu ", scan->length);
 624         printf("seglen=%lu      ", seglength);
 625         printf("segmlen=%lu\n", segmlen);
 626         printf("========================================\n");
 627         }
 628 //++++todo: linked list of segment!
 629         if(segstart == scan->start)
 630         {
 631                 last->next = scan->next;                        // unlink block
 632                 FREEBLOCK(scan);
 633                 scan = last;
 634         }
 635         else
 636                 scan->length = segstart-scan->start;    // shorten block
 637
 638         if(extra > 0)
 639         {
 640                 GETNEWBLOCK;
 641                 mm->mmnew->next = scan->next;
 642                 scan->next = mm->mmnew;
 643                 mm->mmnew->start = segstart+seglength;
 644                 mm->mmnew->length = extra;
 645                 mm->mmnew->attributes = LOCKBIT;
 646         }//else if(segm>0) goto segu;
 647
 648 }
 649
 650 //==========================================================================
 651
 652 /*
 653 ====================
 654 =
 655 = MML_ClearBlock
 656 =
 657 = We are out of blocks, so free a purgable block
 658 =
 659 ====================
 660 */
 661
 662 void MML_ClearBlock(mminfo_t *mm)
 663 {
 664         mmblocktype huge *scan,huge *last;
 665
 666         scan = mm->mmhead->next;
 667
 668         while(scan)
 669         {
 670                 if(!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS))
 671                 {
 672                         MM_FreePtr(scan->useptr, mm);
 673                         return;
 674                 }
 675                 scan = scan->next;
 676         }
 677
 678         printf("MM_ClearBlock: No purgable blocks!\n");
 679 }
 680
 681
 682 //==========================================================================
 683
 684 /*
 685 ===================
 686 =
 687 = MM_Startup
 688 =
 689 = Grabs all space from turbo with malloc/farmalloc
 690 = Allocates bufferseg misc buffer
 691 =
 692 ===================
 693 */
 694
 695 void MM_Startup(mminfo_t *mm, mminfotype *mmi)
 696 {
 697         int i;
 698         dword length,seglength;
 699         //dword length; word seglength;
 700         void huge       *start;
 701         word    segstart;//,endfree;
 702
 703 //      if(mm->mmstarted)
 704 //              MM_Shutdown(mm);
 705
 706         mm->mmstarted = true;
 707         mm->bombonerror = true;
 708         mm->endid=0;
 709
 710 //
 711 // set up the linked list (everything in the free list;
 712 //
 713         mm->mmhead = NULL;
 714         mm->mmfree = &(mm->mmblocks[0]);
 715         for(i=0;i<MAXBLOCKS-1;i++)
 716         {
 717                 mm->mmblocks[i].next = &(mm->mmblocks[i+1]);
 718         }
 719         mm->mmblocks[i].next = NULL;
 720
 721 //
 722 // locked block of all memory until we punch out free space
 723 //
 724         GETNEWBLOCK;
 725         mm->mmhead = mm->mmnew;                         // this will allways be the first node
 726         mm->mmnew->start = 0;
 727         mm->mmnew->length = 0xffff;
 728         mm->mmnew->attributes = LOCKBIT;
 729         mm->mmnew->next = NULL;
 730         mm->mmrover = mm->mmhead;
 731
 732 //
 733 // get all available near conventional memory segments
 734 //
 735 #ifdef __WATCOMC__
 736         _nheapgrow();
 737         length=(dword)_memavl();//(dword)GetFreeSize();
 738         start = (void huge *)(mm->nearheap = _nmalloc(length));
 739 #endif
 740 #ifdef __BORLANDC__
 741         length=coreleft();
 742         start = (void huge *)(mm->nearheap = malloc(length));
 743 #endif
 744         length -= 16-(FP_OFF(start)&15);
 745         length -= SAVENEARHEAP;
 746         seglength = length / 16;                        // now in paragraphs
 747         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 748         MML_UseSpace(segstart,seglength, mm);
 749         mmi->nearheap = length;
 750         //printf("start=%Fp     segstart=%x     seglen=%lu      len=%lu\n", start, segstart, seglength, length);
 751
 752 //
 753 // get all available far conventional memory segments
 754 //
 755         //printf("_FARCORELEFT                          %lu\n", _FCORELEFT);
 756 #ifdef __WATCOMC__
 757         _fheapgrow();
 758 #endif
 759 #ifdef __BORLANDC__
 760         printf("farcoreleft()                           %lu\n", farcoreleft());
 761         printf("(farcoreleft()+32)-_FCORELEFT   %d\n", (sword)((farcoreleft()+32)-_FCORELEFT));
 762 #endif
 763         length=_FCORELEFT;//_fcoreleft();//(dword)GetFarFreeSize();//0xffffUL*4UL;
 764         start = mm->farheap = _fmalloc(length);
 765         //start = mm->farheap = halloc(length, 1);
 766         length -= 16-(FP_OFF(start)&15);
 767         length -= SAVEFARHEAP;
 768         seglength = length / 16;                        // now in paragraphs
 769         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 770         MML_UseSpace(segstart,seglength, mm);
 771         mmi->farheap = length;
 772         //printf("start=%Fp     segstart=%x     seglen=%lu      len=%lu\n", start, segstart, seglength, length);
 773
 774         mmi->mainmem = mmi->nearheap + mmi->farheap;
 775
 776 //
 777 // detect EMS and allocate up to 64K at page frame
 778 //
 779         mmi->EMSmem = 0;
 780         for(i = 1;i <
 781 #ifdef __WATCOMC__
 782         __argc
 783 #endif
 784 #ifdef __BORLANDC__
 785         _argc
 786 #endif
 787         ;i++)
 788         {
 789                 if(US_CheckParm(
 790 #ifdef __WATCOMC__
 791         __argv[i]
 792 #endif
 793 #ifdef __BORLANDC__
 794         _argv[i]
 795 #endif
 796                         ,ParmStringsexmm) == 0)
 797                         goto emsskip;                           // param NOEMS
 798         }
 799         if(MML_CheckForEMS())
 800         {
 801                 MML_SetupEMS(mm);                                       // allocate space
 802                 //TODO: EMS4! AND EMS 3.2 MASSIVE DATA HANDLMENT!
 803                 MML_UseSpace(mm->EMSpageframe,(MAPPAGES)*0x4000lu, mm);
 804                 //if(mm->EMSVer<0x40)
 805                         MM_MapEMS(mm, mmi);                                     // map in used pages
 806                 //else
 807                         //MM_MapXEMS(mm, mmi);                                  // map in used pages
 808         }
 809
 810 //
 811 // detect XMS and get upper memory blocks
 812 //
 813 emsskip:
 814         mmi->XMSmem = 0;
 815 goto xmsskip;//0000
 816         for(i = 1;i <
 817 #ifdef __WATCOMC__
 818         __argc
 819 #endif
 820 #ifdef __BORLANDC__
 821         _argc
 822 #endif
 823         ;i++)
 824         {
 825                 if(US_CheckParm(
 826 #ifdef __WATCOMC__
 827         __argv[i]
 828 #endif
 829 #ifdef __BORLANDC__
 830         _argv[i]
 831 #endif
 832                         ,ParmStringsexmm) == 0)
 833                         goto xmsskip;                           // param NOXMS
 834         }
 835         if(MML_CheckForXMS(mm))
 836         {
 837                 MML_SetupXMS(mm, mmi);                                  // allocate as many UMBs as possible
 838         }
 839
 840 //
 841 // allocate the misc buffer
 842 //
 843 xmsskip:
 844         mm->mmrover = mm->mmhead;               // start looking for space after low block
 845
 846         MM_GetPtr(&(mm->bufferseg),BUFFERSIZE, mm, mmi);
 847 }
 848
 849 //==========================================================================
 850
 851 /*
 852 ====================
 853 =
 854 = MM_Shutdown
 855 =
 856 = Frees all conventional, EMS, and XMS allocated
 857 =
 858 ====================
 859 */
 860
 861 void MM_Shutdown(mminfo_t *mm)
 862 {
 863         if(!(mm->mmstarted))
 864                 return;
 865
 866         _ffree(mm->farheap);//  printf("                far freed\n");
 867 #ifdef __WATCOMC__
 868         _nfree(mm->nearheap);// printf("                near freed\n");
 869 #endif
 870 #ifdef __BORLANDC__
 871         free(mm->nearheap);//   printf("                near freed\n");
 872 #endif
 873         if(MML_CheckForEMS()){ MML_ShutdownEMS(mm); }//printf("         EMS freed\n"); }
 874         if(MML_CheckForXMS(mm)){ MML_ShutdownXMS(mm); }//printf("               XMS freed\n"); }
 875 }
 876
 877 //==========================================================================
 878
 879 /*
 880 ====================
 881 =
 882 = MM_GetPtr
 883 =
 884 = Allocates an unlocked, unpurgable block
 885 =
 886 ====================
 887 */
 888
 889 void MM_GetPtr(memptr *baseptr,dword size, mminfo_t *mm, mminfotype *mmi)
 890 {
 891         mmblocktype huge *scan,huge *lastscan,huge *endscan,huge *purge,huge *next;
 892         int                     search;
 893         dword   needed;
 894         word    startseg;
 895
 896         needed = (size+15)/16;          // convert size from bytes to paragraphs
 897 printf(".");    //0000
 898         GETNEWBLOCK;                            // fill in start and next after a spot is found
 899         mm->mmnew->length = needed;
 900         mm->mmnew->useptr = baseptr;
 901         mm->mmnew->attributes = BASEATTRIBUTES;
 902 printf(".");    //0000
 903         for(search = 0; search<mm->endid; search++)
 904         {
 905 printf("        [case]");       //0000
 906         //
 907         // first search:        try to allocate right after the rover, then on up
 908         // second search:       search from the head pointer up to the rover
 909         // third search:        compress memory, then scan from start
 910                 if(search == 1 && mm->mmrover == mm->mmhead)
 911                         search++;
 912
 913                 switch(search)
 914                 {
 915                 case 0:
 916 printf("0       ");     //0000
 917                         lastscan = mm->mmrover;
 918                         scan = mm->mmrover->next;
 919                         endscan = NULL;
 920                         break;
 921                 case 1:
 922 printf("1       ");     //0000
 923                         lastscan = mm->mmhead;
 924                         scan = mm->mmhead->next;
 925                         endscan = mm->mmrover;
 926                         break;
 927                 case 2:
 928 printf("2       ");     //0000
 929                         MM_SortMem(mm);
 930                         lastscan = mm->mmhead;
 931                         scan = mm->mmhead->next;
 932                         endscan = NULL;
 933                         break;
 934                 }
 935
 936                 startseg = lastscan->start + (word)lastscan->length;
 937
 938                 while(scan != endscan)
 939                 {
 940 //printf(",");  //0000
 941                         if(scan->start - startseg >= needed)
 942                         {
 943 printf(".");    //0000
 944                         //
 945                         // got enough space between the end of lastscan and
 946                         // the start of scan, so throw out anything in the middle
 947                         // and allocate the new block
 948                         //
 949                                 purge = lastscan->next;
 950                                 lastscan->next = mm->mmnew;
 951                                 mm->mmnew->start = *(word *)baseptr = startseg;
 952                                 mm->mmnew->next = scan;
 953                                 while(purge != scan)
 954                                 {       // free the purgable block
 955 printf("                freeing block~\n");     //0000
 956                                         next = purge->next;
 957                                         FREEBLOCK(purge);
 958                                         //MM_FreeBlock(purge, mm);
 959                                         purge = next;           // purge another if not at scan
 960                                 }
 961                                 mm->mmrover = mm->mmnew;
 962                                 return; // good allocation!
 963                         }
 964
 965                         //
 966                         // if this block is purge level zero or locked, skip past it
 967                         //
 968                         if((scan->attributes & LOCKBIT)
 969                                 || !(scan->attributes & PURGEBITS) )
 970                         {
 971 printf("        [lock] ");      //0000
 972 printf("len=%lu ", scan->length);
 973                                 lastscan = scan;
 974                                 startseg = lastscan->start + (word)lastscan->length;
 975                         }
 976
 977 printf("\n");
 978                         scan=scan->next;                // look at next line
 979                 }
 980         }
 981
 982         if (mm->bombonerror)
 983         {
 984 #ifdef __WATCOMC__
 985                 //heapdump();
 986 #endif
 987                 printf(OUT_OF_MEM_MSG,(size-mmi->nearheap));
 988                 printf("for stability reasons the program will shut down! wwww\n");
 989                 printf("                endid=%u\n",(mm->endid));
 990                 MM_Shutdown(mm);
 991                 exit(-1);
 992         }
 993         else
 994                 mm->mmerror = true;
 995 }
 996
 997 //==========================================================================
 998
 999 /*
1000 ====================
1001 =
1002 = MM_FreePtr
1003 =
1004 = Allocates an unlocked, unpurgable block
1005 =
1006 ====================
1007 */
1008
1009 void MM_FreePtr(memptr *baseptr, mminfo_t *mm)
1010 {
1011         mmblocktype huge *scan,huge *last;
1012
1013         last = mm->mmhead;
1014         scan = last->next;
1015
1016         if(baseptr == mm->mmrover->useptr)      // removed the last allocated block
1017                 mm->mmrover = mm->mmhead;
1018
1019         while(scan->useptr != baseptr && scan)
1020         {
1021                 last = scan;
1022                 scan = scan->next;
1023         }
1024
1025         if(!scan)
1026         {
1027                 printf("MM_FreePtr: Block not found!\n");
1028                 return;
1029         }
1030
1031         last->next = scan->next;
1032
1033         FREEBLOCK(scan);
1034 }
1035 //==========================================================================
1036
1037 /*
1038 =====================
1039 =
1040 = MM_SetPurge
1041 =
1042 = Sets the purge level for a block (locked blocks cannot be made purgable)
1043 =
1044 =====================
1045 */
1046
1047 void MM_SetPurge(memptr *baseptr, int purge, mminfo_t *mm)
1048 {
1049         mmblocktype huge *start;
1050
1051         start = mm->mmrover;
1052
1053         do
1054         {
1055                 if(mm->mmrover->useptr == baseptr)
1056                         break;
1057
1058                 mm->mmrover = mm->mmrover->next;
1059
1060                 if(!mm->mmrover)
1061                         mm->mmrover = mm->mmhead;
1062                 else if(mm->mmrover == start)
1063                 {
1064                         printf("MM_SetPurge: Block not found!");
1065                         return;
1066                 }
1067
1068         } while(1);
1069
1070         mm->mmrover->attributes &= ~PURGEBITS;
1071         mm->mmrover->attributes |= purge;
1072 }
1073
1074 //==========================================================================
1075
1076 /*
1077 =====================
1078 =
1079 = MM_SetLock
1080 =
1081 = Locks / unlocks the block
1082 =
1083 =====================
1084 */
1085
1086 void MM_SetLock(memptr *baseptr, boolean locked, mminfo_t *mm)
1087 {
1088         mmblocktype huge *start;
1089
1090         start = mm->mmrover;
1091
1092         do
1093         {
1094                 if(mm->mmrover->useptr == baseptr)
1095                         break;
1096
1097                 mm->mmrover = mm->mmrover->next;
1098
1099                 if(!mm->mmrover)
1100                         mm->mmrover = mm->mmhead;
1101                 else if(mm->mmrover == start)
1102                 {
1103                         printf("MM_SetLock: Block not found!");
1104                         return;
1105                 }
1106
1107         } while(1);
1108
1109         mm->mmrover->attributes &= ~LOCKBIT;
1110         mm->mmrover->attributes |= locked*LOCKBIT;
1111 }
1112
1113 //==========================================================================
1114
1115 /*
1116 =====================
1117 =
1118 = MM_SortMem
1119 =
1120 = Throws out all purgable stuff and compresses movable blocks
1121 =
1122 =====================
1123 */
1124
1125 void MM_SortMem(mminfo_t *mm)
1126 {
1127         mmblocktype huge *scan,huge *last,huge *next;
1128         unsigned        start,length,source,dest,oldborder;
1129         int                     playing;
1130
1131         //
1132         // lock down a currently playing sound
1133         //
1134 /*++++  playing = SD_SoundPlaying ();
1135         if(playing)
1136         {
1137                 switch (SoundMode)
1138                 {
1139                 case sdm_PC:
1140                         playing += STARTPCSOUNDS;
1141                         break;
1142                 case sdm_AdLib:
1143                         playing += STARTADLIBSOUNDS;
1144                         break;
1145                 }
1146                 MM_SetLock(&(memptr)audiosegs[playing],true);
1147         }
1148
1149
1150         SD_StopSound();*/
1151 //      oldborder = bordercolor;
1152 //      VW_ColorBorder (15);
1153
1154         if(beforesort)
1155                 beforesort();
1156
1157         scan = mm->mmhead;
1158
1159         last = NULL;            // shut up compiler warning
1160
1161         while(scan)
1162         {
1163                 if(scan->attributes & LOCKBIT)
1164                 {
1165                 //
1166                 // block is locked, so try to pile later blocks right after it
1167                 //
1168                         start = scan->start + scan->length;
1169                 }
1170                 else
1171                 {
1172                         if(scan->attributes & PURGEBITS)
1173                         {
1174                         //
1175                         // throw out the purgable block
1176                         //
1177                                 next = scan->next;
1178                                 FREEBLOCK(scan);
1179                                 //MM_FreeBlock(scan, mm);
1180                                 last->next = next;
1181                                 scan = next;
1182                                 continue;
1183                         }
1184                         else
1185                         {
1186                         //
1187                         // push the non purgable block on top of the last moved block
1188                         //
1189                                 if(scan->start != start)
1190                                 {
1191                                         length = scan->length;
1192                                         source = scan->start;
1193                                         dest = start;
1194                                         while(length > 0xf00)
1195                                         {
1196                                                 movedata(source,0,dest,0,0xf00*16);
1197                                                 length -= 0xf00;
1198                                                 source += 0xf00;
1199                                                 dest += 0xf00;
1200                                         }
1201                                         movedata(source,0,dest,0,length*16);
1202
1203                                         scan->start = start;
1204                                         *(unsigned *)scan->useptr = start;
1205                                 }
1206                                 start = scan->start + scan->length;
1207                         }
1208                 }
1209
1210                 last = scan;
1211                 scan = scan->next;              // go to next block
1212         }
1213
1214         mm->mmrover = mm->mmhead;
1215
1216         if(aftersort)
1217                 aftersort();
1218
1219 //      VW_ColorBorder (oldborder);
1220
1221 /*++++  if(playing)
1222                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
1223 }
1224
1225 //==========================================================================
1226
1227 /*
1228 =====================
1229 =
1230 = MM_ShowMemory
1231 =
1232 =====================
1233 */
1234
1235 void MM_ShowMemory(global_game_variables_t *gvar,/*page_t *page, */mminfo_t *mm)
1236 {
1237         mmblocktype huge *scan;
1238         word temp;
1239         sdword  end,owner;
1240         //word chx,chy;
1241         word w;
1242         byte    scratch[160],scratch0[4096],str[16];
1243         //byte d = '#';
1244 //****  VW_SetDefaultColors();
1245 //****  VW_SetLineWidth(40);
1246 //++++mh        temp = bufferofs;
1247 //++++mh        bufferofs = 0;
1248 //****  VW_SetScreen (0,0);
1249         scan = mm->mmhead;
1250         end = -1;
1251
1252         CA_OpenDebug (gvar);
1253         w=0;
1254         while(scan)
1255         {
1256                 strcpy(scratch, AARESET);
1257                 if(scan->attributes & PURGEBITS)
1258                         strcpy(scratch0, AAMAGENTA);            // dark purple = purgable
1259                 else
1260                         strcpy(scratch0, AABLUE);               // medium blue = non purgable
1261                 if(scan->attributes & LOCKBIT)
1262                         strcpy(scratch0, AARED);                // red = locked
1263                 if(scan->start<=end)
1264                 {
1265                         printf("\nend==%d\n\n", end);
1266                         strcat(scratch, "MM_ShowMemory: Memory block order currupted!\n");
1267                         strcat(scratch, "End's Size: ");
1268                         ultoa (end,str,10);
1269                         strcat (scratch,str);
1270                         strcat(scratch, "\nscan->start's Size: ");
1271                         ultoa (scan->start,str,10);
1272                         strcat (scratch,str);
1273                         write(gvar->handle.debughandle,scratch,strlen(scratch));
1274                         //modexprint(&page, chx, chy, 1, 0, 24, "\nMM_ShowMemory: Memory block order currupted!\n");
1275                         break;
1276                 }
1277                 //for(;scan->length>0xfffflu;scan->length-=0xfffflu);
1278                 end = scan->start+(scan->length)-1;
1279 //++++          chy = scan->start/320;
1280 //++++          chx = scan->start%320;
1281                                 //modexhlin(page, scan->start, (unsigned)end, chy, color);
1282                                 //for(chx=scan->start;chx+4>=(word)end;chx+=4)
1283                                 //{
1284 //++++                                  modexClearRegion(page, chx, chy, 4, 4, color);
1285                                 //}
1286 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1287                 for(w=(scan->start)/80;w<=end/80;w++)
1288                 {
1289                         //printf("+     %u      %lu\n", w, scan->length);
1290                         strcat(scratch0, "+");
1291                 }
1292                 strcat(scratch0, AARESET); strcat(scratch0, AAGREY); strcat(scratch0,"_");
1293 //++++          VW_Plot(scan->start,0,15);
1294 //++++                          modexClearRegion(page, chx, chy, 4, 4, 15);
1295 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1296                 if((scan->next->start != 0xe000) > end)
1297                 {
1298                         strcat(scratch0, AARESET);
1299                         strcat(scratch0,AAGREEN);
1300                         for(w=0;w<=((scan->length+1)/80);w++)
1301                         {
1302                                 //printf("0     %x      %u      %lu\n", scan->next->start, w, scan->length);
1303                                 strcat(scratch0,"0");
1304                         }
1305                 }else{
1306                         strcat(scratch0, AARESET);
1307                         strcat(scratch0,AAGREEN);
1308                         for(w=0;w<=((scan->length+1)/80);w++)
1309                         {
1310                                 //printf("0     %x      %u      %lu\n", scan->next->start, w, scan->length);
1311                                 strcat(scratch0,"0");
1312                         }
1313                         printf("================\nstart=%x      length==%lu\n           next=%x end=%x\nscan->start+(scan->length)==%x\n================\n", scan->start, scan->length, scan->next->start, end, scan->start+(scan->length));
1314                         printf("w=%u    (scan->length+1)/80)=%lu\n\n", w, (scan->length+1)/80);
1315                         //getch();
1316                 }
1317                 strcat(scratch0, AARESET);
1318                 strcat(scratch0,"\n");
1319                         //for(chx=scan->next->start;chx+4>=(word)end+1;chx+=4)
1320                         //{
1321 //                              chx+=scan->next->start;
1322 //                              modexClearRegion(page, chx, chy, 4, 4, 2);
1323                         //}
1324                                         //modexhlin(page, end+1,scan->next->start, chy, 0);
1325 /*              y = scan->start/320;
1326                 x = scan->start%320;
1327                 VW_Hlin(x,x+end,y,color);
1328                 VW_Plot(x,y,15);*/
1329 //++++                  VW_Hlin(x+end+1,x+(scan->next->start-scan->start),y,0); // black = free
1330                 strcat(scratch,"Seg:");
1331                 ultoa (scan->start,str,16);
1332                 strcat (scratch,str);
1333                 strcat (scratch,"\tSize:");
1334                 ultoa ((word)scan->length,str,10);
1335                 strcat (scratch,str);
1336                 strcat (scratch,"\tOwner:0x");
1337                 owner = (unsigned)scan->useptr;
1338                 ultoa (owner,str,16);
1339                 strcat (scratch,str);
1340                 strcat (scratch,"\n");
1341                 write(gvar->handle.debughandle,scratch,strlen(scratch));
1342                 write(gvar->handle.debughandle,scratch0,strlen(scratch0));
1343 //modexprint(page, chx, chy, 1, 0, 24, &scratch);
1344 //++++chy+=4;
1345 //fprintf(stdout, "%s", scratch);
1346
1347                 scan = scan->next;
1348         }
1349
1350         CA_CloseDebug (gvar);
1351
1352 //++++mh        IN_Ack();
1353 //****  VW_SetLineWidth(64);
1354 //++++mh        bufferofs = temp;
1355 }
1356
1357 //==========================================================================
1358
1359 /*
1360 =====================
1361 =
1362 = MM_DumpData
1363 =
1364 =====================
1365 */
1366
1367 void MM_DumpData(mminfo_t *mm)
1368 {
1369         mmblocktype huge *scan,huge *best;
1370         long    lowest,oldlowest;
1371         word    owner;
1372         byte    lock,purge;
1373         FILE    *dumpfile;
1374
1375         free(mm->nearheap);
1376         dumpfile = fopen ("mmdump.16","w");
1377         if (!dumpfile){
1378                 printf("MM_DumpData: Couldn't open MMDUMP.16!\n");
1379                 return;
1380         }
1381
1382         lowest = -1;
1383         do
1384         {
1385                 oldlowest = lowest;
1386                 lowest = 0xffff;
1387
1388                 scan = mm->mmhead;
1389                 while (scan)
1390                 {
1391                         owner = (word)scan->useptr;
1392
1393                         if (owner && owner<lowest && owner > oldlowest)
1394                         {
1395                                 best = scan;
1396                                 lowest = owner;
1397                         }
1398
1399                         scan = scan->next;
1400                 }
1401
1402                 if (lowest != 0xffff)
1403                 {
1404                         if (best->attributes & PURGEBITS)
1405                                 purge = 'P';
1406                         else
1407                                 purge = '-';
1408                         if (best->attributes & LOCKBIT)
1409                                 lock = 'L';
1410                         else
1411                                 lock = '-';
1412                         fprintf (dumpfile,"0x%p (%c%c) = %u\n"
1413                         ,(word)lowest,lock,purge,best->length);
1414                 }
1415
1416         } while (lowest != 0xffff);
1417
1418         fclose(dumpfile);
1419         printf("MMDUMP.16 created.\n");
1420 }
1421
1422 //==========================================================================
1423
1424
1425 /*
1426 ======================
1427 =
1428 = MM_UnusedMemory
1429 =
1430 = Returns the total free space without purging
1431 =
1432 ======================
1433 */
1434
1435 dword MM_UnusedMemory(mminfo_t *mm)
1436 {
1437         dword free;
1438         mmblocktype huge *scan;
1439
1440         free = 0;
1441         scan = mm->mmhead;
1442
1443         while(scan->next)
1444         {
1445                 free += scan->next->start - (scan->start + scan->length);
1446                 scan = scan->next;
1447         }
1448
1449         return free*16lu;
1450 //      return free;
1451 }
1452
1453 //==========================================================================
1454
1455
1456 /*
1457 ======================
1458 =
1459 = MM_TotalFree
1460 =
1461 = Returns the total free space with purging
1462 =
1463 ======================
1464 */
1465
1466 dword MM_TotalFree(mminfo_t *mm)
1467 {
1468         dword free;
1469         mmblocktype huge *scan;
1470
1471         free = 0;
1472         scan = mm->mmhead;
1473
1474         while(scan->next)
1475         {
1476                 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1477                         free += scan->length;
1478                 free += scan->next->start - (scan->start + scan->length);
1479                 scan = scan->next;
1480         }
1481
1482         return free*16lu;
1483 //      return free;
1484 }
1485
1486 //==========================================================================
1487
1488 /*
1489 =====================
1490 =
1491 = MM_Report
1492 =
1493 =====================
1494 */
1495
1496 void MM_Report(/*page_t *page, */mminfo_t *mm, mminfotype *mmi)
1497 {
1498         if(MML_CheckForEMS())
1499         {
1500                 printf("EMM v%x.%x available\n", mm->EMSVer>>4,mm->EMSVer&0x0F);
1501                 printf("totalEMSpages=%u\n", mm->totalEMSpages);
1502                 printf("freeEMSpages=%u\n", mm->freeEMSpages);
1503                 printf("EMSpageframe=%x\n", mm->EMSpageframe);
1504         }
1505         if(MML_CheckForXMS(mm)) printf("XMSaddr=%X\n", *XMSaddr);
1506         printf("near=%lu\n", mmi->nearheap);
1507         printf("far=%lu\n", mmi->farheap);
1508         printf("EMSmem=%lu\n", mmi->EMSmem);
1509         printf("XMSmem=%lu\n", mmi->XMSmem);
1510         printf("mainmem=%lu\n", mmi->mainmem);
1511         printf("UnusedMemory=%lu\n", MM_UnusedMemory(mm));
1512         printf("TotalFree=%lu\n", MM_TotalFree(mm));
1513         printf("TotalUsed=%lu\n", mmi->mainmem+mmi->EMSmem+mmi->XMSmem+mmi->XMSmem);
1514 }
1515
1516 //==========================================================================
1517
1518 /*
1519 =====================
1520 =
1521 = MM_EMSerr
1522 =
1523 =====================
1524 */
1525
1526 void MM_EMSerr(byte *stri, byte err)
1527 {
1528         //Returns a text string describing the error code in EMS.Error.
1529         switch(err)
1530         {
1531                 case 0x0:
1532                         strcat(stri, "successful");
1533                 break;
1534                 case 0x80:
1535                         strcat(stri, "internal error");
1536                 break;
1537                 case 0x81:
1538                         strcat(stri, "hardware malfunction");
1539                 break;
1540                 case 0x82:
1541                         strcat(stri, "busy .. retry later");
1542                 break;
1543                 case 0x83:
1544                         strcat(stri, "invalid handle");
1545                 break;
1546                 case 0x84:
1547                         strcat(stri, "undefined function requested by application");
1548                 break;
1549                 case 0x85:
1550                         strcat(stri, "no more handles available");
1551                 break;
1552                 case 0x86:
1553                         strcat(stri, "error in save or restore of mapping context");
1554                 break;
1555                 case 0x87:
1556                         strcat(stri, "insufficient memory pages in system");
1557                 break;
1558                 case 0x88:
1559                         strcat(stri, "insufficient memory pages available");
1560                 break;
1561                 case 0x89:
1562                         strcat(stri, "zero pages requested");
1563                 break;
1564                 case 0x8A:
1565                         strcat(stri, "invalid logical page number encountered");
1566                 break;
1567                 case 0x8B:
1568                         strcat(stri, "invalid physical page number encountered");
1569                 break;
1570                 case 0x8C:
1571                         strcat(stri, "page-mapping hardware state save area is full");
1572                 break;
1573                 case 0x8D:
1574                         strcat(stri, "save of mapping context failed");
1575                 break;
1576                 case 0x8E:
1577                         strcat(stri, "restore of mapping context failed");
1578                 break;
1579                 case 0x8F:
1580                         strcat(stri, "undefined subfunction");
1581                 break;
1582                 case 0x90:
1583                         strcat(stri, "undefined attribute type");
1584                 break;
1585                 case 0x91:
1586                         strcat(stri, "feature not supported");
1587                 break;
1588                 case 0x92:
1589                         strcat(stri, "successful, but a portion of the source region has been overwritten");
1590                 break;
1591                 case 0x93:
1592                         strcat(stri, "length of source or destination region exceeds length of region allocated to either source or destination handle");
1593                 break;
1594                 case 0x94:
1595                         strcat(stri, "conventional and expanded memory regions overlap");
1596                 break;
1597                 case 0x95:
1598                         strcat(stri, "offset within logical page exceeds size of logical page");
1599                 break;
1600                 case 0x96:
1601                         strcat(stri, "region length exceeds 1 MB");
1602                 break;
1603                 case 0x97:
1604                         strcat(stri, "source and destination EMS regions have same handle and overlap");
1605                 break;
1606                 case 0x98:
1607                         strcat(stri, "memory source or destination type undefined");
1608                 break;
1609                 case 0x9A:
1610                         strcat(stri, "specified alternate map register or DMA register set not supported");
1611                 break;
1612                 case 0x9B:
1613                         strcat(stri, "all alternate map register or DMA register sets currently allocated");
1614                 break;
1615                 case 0x9C:
1616                         strcat(stri, "alternate map register or DMA register sets not supported");
1617                 break;
1618                 case 0x9D:
1619                         strcat(stri, "undefined or unallocated alternate map register or DMA register set");
1620                 break;
1621                 case 0x9E:
1622                         strcat(stri, "dedicated DMA channels not supported");
1623                 break;
1624                 case 0x9F:
1625                         strcat(stri, "specified dedicated DMA channel not supported");
1626                 break;
1627                 case 0xA0:
1628                         strcat(stri, "no such handle name");
1629                 break;
1630                 case 0xA1:
1631                         strcat(stri, "a handle found had no name, or duplicate handle name");
1632                 break;
1633                 case 0xA2:
1634                         strcat(stri, "attempted to wrap around 1M conventional address space");
1635                 break;
1636                 case 0xA3:
1637                         strcat(stri, "source array corrupted");
1638                 break;
1639                 case 0xA4:
1640                         strcat(stri, "operating system denied access");
1641                 break;
1642                 default:
1643                         strcat(stri, "undefined error");
1644         }
1645 }
1646
1647 //==========================================================================
1648
1649 /*
1650 =====================
1651 =
1652 = MM_BombOnError
1653 =
1654 =====================
1655 */
1656
1657 void MM_BombOnError(boolean bomb, mminfo_t *mm)
1658 {
1659         mm->bombonerror = bomb;
1660 }
1661
1662 /*void MM_GetNewBlock(mminfo_t *mm)
1663 {
1664         if(!mm->mmfree)
1665                 MML_ClearBlock(mm);
1666         mm->mmnew=mm->mmfree;
1667         mm->mmfree=mm->mmfree->next;
1668         if(!(mm->mmnew=mm->mmfree))
1669         {
1670                 printf("MM_GETNEWBLOCK: No free blocks!\n");
1671                 return;
1672         }
1673         mm->mmfree=mm->mmfree->next;
1674         mm->endid++;    //end of list
1675 }
1676
1677 void MM_FreeBlock(mmblocktype *x, mminfo_t *mm)
1678 {
1679         x->useptr=NULL;
1680         x->next=mm->mmfree;
1681         mm->mmfree=x;
1682         mm->endid--;    //end of list
1683 }*/
1684
1685 /*void MM_seguin(void)
1686 {
1687         __asm {
1688                 push    ds
1689                 mov     ax,ds
1690                 inc             ax
1691                 mov     ds,ax
1692         }
1693 }
1694
1695 void MM_segude(void)
1696 {
1697         __asm {
1698                 pop ds
1699         }
1700 }*/
1701
1702 /*
1703 pull data from far and put it into ds var
1704 mov ax,es:si
1705 mov x,ax
1706 */
1707 /*
1708 ss stack segment
1709 sp top of stack
1710 bp bottem of stack
1711 */