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                 //LEA   DX, emmname     //fix by andrius4669
  94                 mov     dx,OFFSET emmname       //fix by andrius4669
  95                 mov     ax,0x3d00
  96                 int     0x21            // try to open EMMXXXX0 device
  97                 jc      error
  98
  99                 mov     bx,ax
 100                 mov     ax,0x4400
 101
 102                 int     0x21            // get device info
 103                 jc      error
 104
 105                 and     dx,0x80
 106                 jz      error
 107
 108                 mov     ax,0x4407
 109
 110                 int     0x21            // get status
 111                 jc      error
 112                 or      al,al
 113                 jz      error
 114
 115                 mov     ah,0x3e
 116                 int     0x21            // close handle
 117                 jc      error
 118                 //
 119                 // EMS is good
 120                 //
 121                 mov     emmcfems,1
 122                 jmp End
 123 #ifdef __BORLANDC__
 124         }
 125 #endif
 126                 error:
 127 #ifdef __BORLANDC__
 128         __asm {
 129 #endif
 130                 //
 131                 // EMS is bad
 132                 //
 133                 mov     emmcfems,0
 134 #ifdef __BORLANDC__
 135         }
 136 #endif
 137                 End:
 138 #ifdef __WATCOMC__
 139         }
 140 #endif
 141         return(emmcfems);
 142 }
 143
 144
 145 /*
 146 ======================
 147 =
 148 = MML_SetupEMS
 149 =
 150 =======================
 151 */
 152
 153 byte MML_SetupEMS(mminfo_t *mm)
 154 {
 155         byte    str[160];
 156         byte    err;
 157         boolean errorflag=false;
 158
 159         unsigned int EMSVer = 0;
 160         //byte  EMS_status;
 161         unsigned        totalEMSpages,freeEMSpages,EMSpageframe,EMSpagesmapped,EMShandle;
 162         totalEMSpages = freeEMSpages = EMSpageframe = EMSpagesmapped = 0;
 163
 164         __asm {
 165                 mov     ah,EMS_STATUS
 166                 int     EMS_INT                                         // make sure EMS hardware is present
 167                 or      ah,ah
 168                 //mov   [EMS_status],ah
 169                 jnz     error
 170
 171                 mov     ah,EMS_VERSION
 172                 int     EMS_INT
 173                 or      ah,ah
 174                 jnz     error
 175                 mov     [EMSVer],ax                             //      set EMSVer
 176                 cmp     al,0x32                                         // only work on ems 3.2 or greater
 177                 jb      error
 178
 179                 mov     ah,EMS_GETFRAME
 180                 int     EMS_INT                                         // find the page frame address
 181                 or      ah,ah
 182                 jnz     error
 183                 mov     [EMSpageframe],bx
 184
 185                 mov     ah,EMS_GETPAGES
 186                 int     EMS_INT                                         // find out how much EMS is there
 187                 or      ah,ah
 188                 jnz     error
 189                 mov     [totalEMSpages],dx
 190                 mov     [freeEMSpages],bx
 191                 or      bx,bx
 192                 jz      noEMS                                           // no EMS at all to allocate
 193                                                                                         //EXPAND DONG!!!!
 194                 cmp     [EMSVer],0x40
 195                 jb      low
 196                 cmp     bx,[freeEMSpages]
 197                 jle     getpages
 198                 mov     bx,[freeEMSpages]
 199                 jmp     getpages
 200 #ifdef __BORLANDC__
 201         }
 202 #endif
 203         low:
 204 #ifdef __BORLANDC__
 205         __asm {
 206 #endif
 207                 cmp     bx,4
 208                 jle     getpages                                        // there is only 1,2,3,or 4 pages
 209                 mov     bx,4                                            // we can't use more than 4 pages
 210 #ifdef __BORLANDC__
 211         }
 212 #endif
 213         getpages:
 214 #ifdef __BORLANDC__
 215         __asm {
 216 #endif
 217                 mov     [EMSpagesmapped],bx
 218                 mov     ah,EMS_ALLOCPAGES                       // allocate up to 64k of EMS
 219                 int     EMS_INT
 220                 or      ah,ah
 221                 jnz     error
 222                 mov     [EMShandle],dx
 223                 jmp End
 224 #ifdef __BORLANDC__
 225         }
 226 #endif
 227         error:
 228 #ifdef __BORLANDC__
 229         __asm {
 230 #endif
 231                 mov     err,ah
 232                 mov     errorflag,1
 233                 jmp End
 234 #ifdef __BORLANDC__
 235         }
 236 #endif
 237 noEMS:
 238 End:
 239 #ifdef __WATCOMC__
 240         }
 241 #endif
 242         if(errorflag==true)
 243         {
 244                 //err = CPURegs.h.ah;
 245                 strcpy(str,"MM_SetupEMS: EMS error ");
 246                 //itoa(err,str2,16);
 247                 MM_EMSerr(str, err);
 248                 printf("%s\n",str);
 249                 return err;
 250         }
 251         mm->totalEMSpages=totalEMSpages;
 252         mm->freeEMSpages=freeEMSpages;
 253         mm->EMSpageframe=EMSpageframe;
 254         mm->EMSpagesmapped=EMSpagesmapped;
 255         mm->EMShandle=EMShandle;
 256         mm->EMSVer=EMSVer;
 257         return 0;
 258 }
 259
 260
 261 /*
 262 ======================
 263 =
 264 = MML_ShutdownEMS
 265 =
 266 =======================
 267 */
 268
 269 void MML_ShutdownEMS(mminfo_t *mm)
 270 {
 271         boolean errorflag=false;
 272         unsigned EMShandle=mm->EMShandle;
 273
 274         if(!EMShandle)
 275                 return;
 276         __asm {
 277                 mov     ah,EMS_FREEPAGES
 278                 mov     dx,[EMShandle]
 279                 int     EMS_INT
 280                 or      ah,ah
 281                 jz      ok
 282                 mov     errorflag,1
 283 #ifdef __BORLANDC__
 284         }
 285 #endif
 286                 ok:
 287 #ifdef __WATCOMC__
 288         }
 289 #endif
 290         if(errorflag==true) printf("MML_ShutdownEMS: Error freeing EMS!\n");    //++++ add something
 291 }
 292
 293 /*
 294 ====================
 295 =
 296 = MM_MapEMS
 297 =
 298 = Maps the 64k of EMS used by memory manager into the page frame
 299 = for general use.  This only needs to be called if you are keeping
 300 = other things in EMS.
 301 =
 302 ====================
 303 */
 304
 305 byte MM_MapEMS(mminfo_t *mm, mminfotype *mmi)
 306 {
 307         byte    str[160];
 308         unsigned        EMShandle;
 309         byte err;
 310         boolean errorflag=false;
 311         int     i;
 312         EMShandle=mm->EMShandle;
 313
 314         for (i=0;i<4/*MAPPAGES*/;i++)
 315         {
 316                 __asm {
 317                         mov     ah,EMS_MAPPAGE
 318                         mov     bx,[i]                  // logical page
 319                         mov     al,bl                   // physical page
 320                         mov     dx,[EMShandle]  // handle
 321                         int     EMS_INT
 322                         or      ah,ah
 323                         jnz     error
 324                         jmp End
 325 #ifdef __BORLANDC__
 326                 }
 327 #endif
 328                         error:
 329 #ifdef __BORLANDC__
 330                 __asm {
 331 #endif
 332                         mov     err,ah
 333                         mov     errorflag,1
 334 #ifdef __BORLANDC__
 335                 }
 336 #endif
 337                         End:
 338 #ifdef __WATCOMC__
 339                 }
 340 #endif
 341                 if(errorflag==true)
 342                 {
 343                         //err = CPURegs.h.ah;
 344                         strcpy(str,"MM_MapEMS: EMS error ");
 345                         //itoa(err,str2,16);
 346                         MM_EMSerr(str, err);
 347                         printf("%s\n",str);
 348                         //printf("FACK! %x\n", err);
 349                         return err;
 350                 }
 351         }
 352         mmi->EMSmem = (i)*0x4000lu;
 353         return 0;
 354 }
 355
 356 byte MM_MapXEMS(mminfo_t *mm, mminfotype *mmi)
 357 {
 358 //SUB EMS.MapXPages (PhysicalStart, LogicalStart, NumPages, Handle)
 359
 360         //Maps up to 4 logical EMS pages to physical pages in the page frame, where:
 361         //PhysicalStart = Physical page first logical page is mapped to
 362         //LogicalStart  = First logical page to map
 363         //NumPages      = Number of pages to map (1 to 4)
 364         //Handle        = EMS handle logical pages are allocated to
 365
 366   /*//Create a buffer containing the page information
 367 //  FOR x = 0 TO NumPages - 1
 368 //    MapInfo$ = MapInfo$ + MKI$(LogicalStart + x) + MKI$(PhysicalStart + x)
 369 //  NEXT*/
 370
 371 //  Regs.ax = 0x5000                           //Map the pages in the buffer
 372 //  Regs.cx = NumPages                         //to the pageframe
 373 //  Regs.dx = Handle
 374 //  Regs.ds = VARSEG(MapInfo$)
 375 //  Regs.si = SADD(MapInfo$)
 376 //  InterruptX 0x67, Regs, Regs
 377 //      EMS.Error = (Regs.ax AND 0xFF00&) \ 0x100  //Store the status code
 378
 379 //END SUB
 380         byte    str[160];
 381         byte err;
 382         word    EMShandle;
 383         boolean errorflag=false;
 384         int     i;
 385         EMShandle=mm->EMShandle;
 386
 387         if(mm->EMSVer<0x40)
 388                 return 5;
 389
 390         for (i=0;i<MAPPAGES;i++)
 391         {
 392                 __asm {
 393                         mov     ah,EMS_MAPXPAGE
 394                         mov     cx,[i]                  // logical page
 395                         mov     al,bl                   // physical page
 396                         mov     dx,[EMShandle]  // handle
 397                         int     EMS_INT
 398                         or      ah,ah
 399                         jnz     error
 400                         jmp End
 401 #ifdef __BORLANDC__
 402                 }
 403 #endif
 404                         error:
 405 #ifdef __BORLANDC__
 406                 __asm {
 407 #endif
 408                         mov     err,ah
 409                         mov     errorflag,1
 410 #ifdef __BORLANDC__
 411                 }
 412 #endif
 413                         End:
 414 #ifdef __WATCOMC__
 415                 }
 416 #endif
 417                 if(errorflag==true)
 418                 {
 419                         //err = CPURegs.h.ah;
 420                         //strcpy(str,"MM_MapXEMS: EMS error 0x");
 421                         strcpy(str,"MM_MapXEMS: EMS error ");
 422                         //itoa(err,str2,16);
 423                         MM_EMSerr(str, err);
 424                         printf("%s\n",str);
 425                         //printf("%s%x\n",str, err);
 426                         //printf("FACK! %x\n", err);
 427                         return err;
 428                 }
 429         }
 430         mmi->EMSmem = (i)*0x4000lu;
 431         return 0;
 432 }
 433
 434 //==========================================================================
 435
 436 /*
 437 ======================
 438 =
 439 = MML_CheckForXMS
 440 =
 441 = Check for XMM driver
 442 =
 443 =======================
 444 */
 445
 446 boolean MML_CheckForXMS(mminfo_t *mm)
 447 {
 448         boolean errorflag=false;
 449         mm->numUMBs = 0;
 450
 451         __asm {
 452                 mov     ax,0x4300
 453                 int     0x2f                            // query status of installed diver
 454                 cmp     al,0x80
 455                 je      good
 456                 mov     errorflag,1
 457 #ifdef __BORLANDC__
 458         }
 459 #endif
 460                 good:
 461 #ifdef __WATCOMC__
 462         }
 463 #endif
 464         if(errorflag==true) return false;
 465         else return true;
 466 }
 467
 468
 469 /*
 470 ======================
 471 =
 472 = MML_SetupXMS
 473 =
 474 = Try to allocate all upper memory block
 475 =
 476 =======================
 477 */
 478
 479 void MML_SetupXMS(mminfo_t *mm, mminfotype *mmi)
 480 {
 481         word    base,size;
 482
 483 getmemory:
 484         __asm {
 485                 mov     ax,0x4310
 486                 int     0x2f
 487                 mov     [WORD PTR XMSaddr],bx
 488                 mov     [WORD PTR XMSaddr+2],es         // function pointer to XMS driver
 489
 490                 mov     ah,XMS_ALLOCUMB
 491                 mov     dx,0xffff                                       // try for largest block possible
 492                 //mov     ax,dx                                         // Set available Kbytes.
 493                 call    [DWORD PTR XMSaddr]
 494                 or      ax,ax
 495                 jnz     gotone
 496
 497                 cmp     bl,0xb0                                         // error: smaller UMB is available
 498                 jne     done;
 499
 500                 mov     ah,XMS_ALLOCUMB
 501                 call    [DWORD PTR XMSaddr]             // DX holds largest available UMB
 502                 or      ax,ax
 503                 jz      done                                            // another error...
 504 #ifdef __BORLANDC__
 505         }
 506 #endif
 507                 gotone:
 508 #ifdef __BORLANDC__
 509         __asm {
 510 #endif
 511                 mov     [base],bx
 512                 mov     [size],dx
 513 #ifdef __BORLANDC__
 514         }
 515 #endif
 516                 done:
 517 #ifdef __WATCOMC__
 518         }
 519 #endif
 520 //      printf("base=%u ", base); printf("size=%u\n", size);
 521         MML_UseSpace(base,size, mm);
 522         mmi->XMSmem += size*16;
 523         mm->UMBbase[mm->numUMBs] = base;
 524         mm->numUMBs++;
 525         if(mm->numUMBs < MAXUMBS)
 526                 goto getmemory;
 527 }
 528
 529
 530 /*
 531 ======================
 532 =
 533 = MML_ShutdownXMS
 534 =
 535 ======================
 536 */
 537
 538 void MML_ShutdownXMS(mminfo_t *mm)
 539 {
 540         int     i;
 541         unsigned        base;
 542
 543         for (i=0;i<mm->numUMBs;i++)
 544         {
 545                 base = mm->UMBbase[i];
 546                 __asm {
 547                         mov     ah,XMS_FREEUMB
 548                         mov     dx,[base]
 549                         call    [DWORD PTR XMSaddr]
 550                 }
 551         }
 552 }
 553
 554 //==========================================================================
 555
 556 /*
 557 ======================
 558 =
 559 = MML_UseSpace
 560 =
 561 = Marks a range of paragraphs as usable by the memory manager
 562 = This is used to mark space for the near heap, far heap, ems page frame,
 563 = and upper memory blocks
 564 =
 565 ======================
 566 */
 567
 568 void MML_UseSpace(/*d*/word segstart, dword seglength, mminfo_t *mm)
 569 {
 570         mmblocktype huge *scan,huge *last;
 571         word            segm;
 572         dword   oldend;
 573         dword           extra;
 574
 575         scan = last = mm->mmhead;
 576         mm->mmrover = mm->mmhead;               // reset rover to start of memory
 577
 578 //
 579 // search for the block that contains the range of segments
 580 //
 581         while(scan->start+scan->length < segstart)
 582         {
 583                 last = scan;
 584                 scan = scan->next;
 585         }
 586
 587         //find out how many blocks it spans!
 588         if(seglength>0xffffu)
 589         {
 590 //              segm=seglength/0x4000u;
 591                 segm=(word)seglength/0xffffu;
 592         }
 593         else segm=1;
 594
 595         //++++emsver stuff!
 596         if(segm>1/*extra>0xfffflu*/)
 597         {
 598                 /*__asm
 599                 {
 600                         push    ds
 601                         mov     ax,ds
 602                         inc             ax
 603                         mov     ds,ax
 604                 }*/
 605
 606
 607 //MML_UseSpace(?segstart?, ?length?, mm);
 608
 609                 /*__asm
 610                 {
 611                         pop ds
 612                 }*/
 613                 //printf("MML_UseSpace: Segment spans two blocks!\n");
 614         }
 615
 616 //
 617 // take the given range out of the block
 618 //
 619         oldend = scan->start + scan->length;
 620         extra = oldend - (segstart+seglength);
 621 /*
 622 printf("segm=%u ", segm);
 623 printf("ex=%lu  ", extra);
 624 printf("start+seglen=%lu        ", segstart+seglength);
 625 printf("len=%u  ", scan->length);
 626 printf("segsta=%x       ", segstart);
 627 printf("seglen=%lu\n", seglength);
 628 */
 629 //segu:
 630 //++++todo: linked list of segment!
 631 //printf("segm=%lu\n", segm);
 632         if(segstart == scan->start)
 633         {
 634                 last->next = scan->next;                        // unlink block
 635                 FREEBLOCK(scan);
 636                 scan = last;
 637         }
 638         else
 639                 scan->length = segstart-scan->start;    // shorten block
 640
 641 //      segm--;
 642
 643         if(extra > 0)
 644         {
 645                 //MM_GetNewBlock(mm);
 646                 GETNEWBLOCK;
 647                 mm->mmnew->next = scan->next;
 648                 scan->next = mm->mmnew;
 649                 mm->mmnew->start = segstart+seglength;
 650                 mm->mmnew->length = extra;
 651                 mm->mmnew->attributes = LOCKBIT;
 652         }//else if(segm>0) goto segu;
 653
 654 }
 655
 656 //==========================================================================
 657
 658 /*
 659 ====================
 660 =
 661 = MML_ClearBlock
 662 =
 663 = We are out of blocks, so free a purgable block
 664 =
 665 ====================
 666 */
 667
 668 void MML_ClearBlock(mminfo_t *mm)
 669 {
 670         mmblocktype huge *scan,huge *last;
 671
 672         scan = mm->mmhead->next;
 673
 674         while(scan)
 675         {
 676                 if(!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS))
 677                 {
 678                         MM_FreePtr(scan->useptr, mm);
 679                         return;
 680                 }
 681                 scan = scan->next;
 682         }
 683
 684         printf("MM_ClearBlock: No purgable blocks!\n");
 685 }
 686
 687
 688 //==========================================================================
 689
 690 /*
 691 ===================
 692 =
 693 = MM_Startup
 694 =
 695 = Grabs all space from turbo with malloc/farmalloc
 696 = Allocates bufferseg misc buffer
 697 =
 698 ===================
 699 */
 700
 701 void MM_Startup(mminfo_t *mm, mminfotype *mmi)
 702 {
 703         int i;
 704         dword length,seglength;
 705         //dword length; word seglength;
 706         void huge       *start;
 707         word    segstart;//,endfree;
 708
 709 //      if(mm->mmstarted)
 710 //              MM_Shutdown(mm);
 711
 712         mm->mmstarted = true;
 713         mm->bombonerror = true;
 714         mm->endid=0;
 715
 716 //
 717 // set up the linked list (everything in the free list;
 718 //
 719         //printf("              linked list making!\n");
 720         mm->mmhead = NULL;
 721         mm->mmfree = &(mm->mmblocks[0]);
 722         for(i=0;i<MAXBLOCKS-1;i++)
 723         {
 724                 mm->mmblocks[i].next = &(mm->mmblocks[i+1]);
 725         }
 726         mm->mmblocks[i].next = NULL;
 727
 728 //
 729 // locked block of all memory until we punch out free space
 730 //
 731         //printf("              newblock making!\n");
 732         //MM_GetNewBlock(mm);
 733         GETNEWBLOCK;
 734         mm->mmhead = mm->mmnew;                         // this will allways be the first node
 735         mm->mmnew->start = 0;
 736         mm->mmnew->length = 0xffff;
 737         mm->mmnew->attributes = LOCKBIT;
 738         mm->mmnew->next = NULL;
 739         mm->mmrover = mm->mmhead;
 740
 741 //
 742 // get all available near conventional memory segments
 743 //
 744 //      printf("                nearheap making!\n");
 745 #ifdef __WATCOMC__
 746         _nheapgrow();
 747         length=(dword)_memavl();//(dword)GetFreeSize();
 748         start = (void huge *)(mm->nearheap = _nmalloc(length));
 749 #endif
 750 #ifdef __BORLANDC__
 751         length=coreleft();
 752         start = (void huge *)(mm->nearheap = malloc(length));
 753 #endif
 754         length -= 16-(FP_OFF(start)&15);
 755         length -= SAVENEARHEAP;
 756         seglength = length / 16;                        // now in paragraphs
 757         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 758         MML_UseSpace(segstart,seglength, mm);
 759         mmi->nearheap = length;
 760         printf("start=%Fp       segstart=%x     seglen=%lu      len=%lu\n", start, segstart, seglength, length);
 761         //heapdump();
 762
 763 //
 764 // get all available far conventional memory segments
 765 //
 766 //      printf("                farheap making!\n");
 767         printf("_FARCORELEFT                            %lu\n", _FCORELEFT);
 768 #ifdef __WATCOMC__
 769         _fheapgrow();
 770 #endif
 771 #ifdef __BORLANDC__
 772         printf("                                %lu\n", farcoreleft());
 773         printf("                                %d\n", (sword)((farcoreleft()+32)-_FCORELEFT));
 774 #endif
 775         length=_FCORELEFT;//_fcoreleft();//(dword)GetFarFreeSize();//0xffffUL*4UL;
 776         start = mm->farheap = _fmalloc(length);
 777         //start = mm->farheap = halloc(length, 1);
 778         length -= 16-(FP_OFF(start)&15);
 779         length -= SAVEFARHEAP;
 780         seglength = length / 16;                        // now in paragraphs
 781         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 782         MML_UseSpace(segstart,seglength, mm);
 783         mmi->farheap = length;
 784         printf("start=%Fp       segstart=%x     seglen=%lu      len=%lu\n", start, segstart, seglength, length);
 785         //heapdump();
 786
 787         mmi->mainmem = mmi->nearheap + mmi->farheap;
 788
 789 //      getch();
 790
 791 //goto xmsskip;
 792
 793 //
 794 // detect EMS and allocate up to 64K at page frame
 795 //
 796 //printf("              EMS1\n");
 797 //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!
 798         mmi->EMSmem = 0;
 799         for(i = 1;i <
 800 #ifdef __WATCOMC__
 801         __argc
 802 #endif
 803 #ifdef __BORLANDC__
 804         _argc
 805 #endif
 806         ;i++)
 807         {
 808                 if(US_CheckParm(
 809 #ifdef __WATCOMC__
 810         __argv[i]
 811 #endif
 812 #ifdef __BORLANDC__
 813         _argv[i]
 814 #endif
 815                         ,ParmStringsexmm) == 0)
 816                         goto emsskip;                           // param NOEMS
 817         }
 818 //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!
 819         if(MML_CheckForEMS())
 820         {
 821 //printf("              EMS2\n");
 822 //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!
 823                 MML_SetupEMS(mm);                                       // allocate space
 824 //printf("              EMS3\n");
 825 //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!
 826                 //TODO: EMS4! AND EMS 3.2 MASSIVE DATA HANDLMENT!
 827                 MML_UseSpace(mm->EMSpageframe,(MAPPAGES)*0x4000lu, mm);
 828 //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!
 829 //printf("              EMS4\n");
 830                 //if(mm->EMSVer<0x40)
 831                         MM_MapEMS(mm, mmi);                                     // map in used pages
 832                 //else
 833                         //MM_MapXEMS(mm, mmi);                                  // map in used pages
 834         }
 835
 836 //
 837 // detect XMS and get upper memory blocks
 838 //
 839 emsskip:
 840         mmi->XMSmem = 0;
 841         for(i = 1;i <
 842 #ifdef __WATCOMC__
 843         __argc
 844 #endif
 845 #ifdef __BORLANDC__
 846         _argc
 847 #endif
 848         ;i++)
 849         {
 850                 if(US_CheckParm(
 851 #ifdef __WATCOMC__
 852         __argv[i]
 853 #endif
 854 #ifdef __BORLANDC__
 855         _argv[i]
 856 #endif
 857                         ,ParmStringsexmm) == 0)
 858                         goto xmsskip;                           // param NOXMS
 859         }
 860 //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!
 861         if(MML_CheckForXMS(mm))
 862         {
 863 //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!
 864 //printf("              XMS!\n");
 865                 MML_SetupXMS(mm, mmi);                                  // allocate as many UMBs as possible
 866         }
 867
 868 //
 869 // allocate the misc buffer
 870 //
 871 xmsskip:
 872         mm->mmrover = mm->mmhead;               // start looking for space after low block
 873
 874         MM_GetPtr(&(mm->bufferseg),BUFFERSIZE, mm, mmi);
 875 }
 876
 877 //==========================================================================
 878
 879 /*
 880 ====================
 881 =
 882 = MM_Shutdown
 883 =
 884 = Frees all conventional, EMS, and XMS allocated
 885 =
 886 ====================
 887 */
 888
 889 void MM_Shutdown(mminfo_t *mm)
 890 {
 891         if(!(mm->mmstarted))
 892                 return;
 893
 894         _ffree(mm->farheap);//  printf("                far freed\n");
 895 #ifdef __WATCOMC__
 896         _nfree(mm->nearheap);// printf("                near freed\n");
 897 #endif
 898 #ifdef __BORLANDC__
 899         free(mm->nearheap);//   printf("                near freed\n");
 900 #endif
 901         if(MML_CheckForEMS()){ MML_ShutdownEMS(mm); }//printf("         EMS freed\n"); }
 902         if(MML_CheckForXMS(mm)){ MML_ShutdownXMS(mm); }//printf("               XMS freed\n"); }
 903 }
 904
 905 //==========================================================================
 906
 907 /*
 908 ====================
 909 =
 910 = MM_GetPtr
 911 =
 912 = Allocates an unlocked, unpurgable block
 913 =
 914 ====================
 915 */
 916
 917 void MM_GetPtr(memptr *baseptr,dword size, mminfo_t *mm, mminfotype *mmi)
 918 {
 919         mmblocktype huge *scan,huge *lastscan,huge *endscan,huge *purge,huge *next;
 920         int                     search;
 921         dword   needed;
 922         word    startseg;
 923
 924         needed = (size+15)/16;          // convert size from bytes to paragraphs
 925 printf(".");    //0000
 926         //MM_GetNewBlock(mm);
 927         GETNEWBLOCK;                            // fill in start and next after a spot is found
 928         mm->mmnew->length = needed;
 929         mm->mmnew->useptr = baseptr;
 930         mm->mmnew->attributes = BASEATTRIBUTES;
 931 printf(".");    //0000
 932         for(search = 0; search<mm->endid; search++)
 933         {
 934 printf("        [case]");       //0000
 935         //
 936         // first search:        try to allocate right after the rover, then on up
 937         // second search:       search from the head pointer up to the rover
 938         // third search:        compress memory, then scan from start
 939                 if(search == 1 && mm->mmrover == mm->mmhead)
 940                         search++;
 941
 942                 switch(search)
 943                 {
 944                 case 0:
 945 printf("0       ");     //0000
 946                         lastscan = mm->mmrover;
 947                         scan = mm->mmrover->next;
 948                         endscan = NULL;
 949                         break;
 950                 case 1:
 951 printf("1       ");     //0000
 952                         lastscan = mm->mmhead;
 953                         scan = mm->mmhead->next;
 954                         endscan = mm->mmrover;
 955                         break;
 956                 case 2:
 957 printf("2       ");     //0000
 958                         MM_SortMem(mm);
 959                         lastscan = mm->mmhead;
 960                         scan = mm->mmhead->next;
 961                         endscan = NULL;
 962                         break;
 963                 }
 964
 965                 startseg = lastscan->start + (word)lastscan->length;
 966
 967                 while(scan != endscan)
 968                 {
 969 //printf(",");  //0000
 970                         if(scan->start - startseg >= needed)
 971                         {
 972 printf(".");    //0000
 973                         //
 974                         // got enough space between the end of lastscan and
 975                         // the start of scan, so throw out anything in the middle
 976                         // and allocate the new block
 977                         //
 978                                 purge = lastscan->next;
 979                                 lastscan->next = mm->mmnew;
 980                                 mm->mmnew->start = *(word *)baseptr = startseg;
 981                                 mm->mmnew->next = scan;
 982                                 while(purge != scan)
 983                                 {       // free the purgable block
 984 printf("                freeing block~\n");     //0000
 985                                         next = purge->next;
 986                                         FREEBLOCK(purge);
 987                                         //MM_FreeBlock(purge, mm);
 988                                         purge = next;           // purge another if not at scan
 989                                 }
 990                                 mm->mmrover = mm->mmnew;
 991                                 return; // good allocation!
 992                         }
 993
 994                         //
 995                         // if this block is purge level zero or locked, skip past it
 996                         //
 997                         if((scan->attributes & LOCKBIT)
 998                                 || !(scan->attributes & PURGEBITS) )
 999                         {
1000 printf("        [lock] ");      //0000
1001 printf("len=%lu ", scan->length);
1002                                 lastscan = scan;
1003                                 startseg = lastscan->start + (word)lastscan->length;
1004                         }
1005
1006 printf("\n");
1007                         scan=scan->next;                // look at next line
1008                 }
1009         }
1010
1011         if (mm->bombonerror)
1012         {
1013 #ifdef __WATCOMC__
1014                 //heapdump();
1015 #endif
1016                 printf(OUT_OF_MEM_MSG,(size-mmi->nearheap));
1017                 printf("for stability reasons the program will shut down! wwww\n");
1018                 printf("                endid=%u\n",(mm->endid));
1019                 MM_Shutdown(mm);
1020                 exit(-1);
1021         }
1022         else
1023                 mm->mmerror = true;
1024 }
1025
1026 //==========================================================================
1027
1028 /*
1029 ====================
1030 =
1031 = MM_FreePtr
1032 =
1033 = Allocates an unlocked, unpurgable block
1034 =
1035 ====================
1036 */
1037
1038 void MM_FreePtr(memptr *baseptr, mminfo_t *mm)
1039 {
1040         mmblocktype huge *scan,huge *last;
1041
1042         last = mm->mmhead;
1043         scan = last->next;
1044
1045         if(baseptr == mm->mmrover->useptr)      // removed the last allocated block
1046                 mm->mmrover = mm->mmhead;
1047
1048         while(scan->useptr != baseptr && scan)
1049         {
1050                 last = scan;
1051                 scan = scan->next;
1052         }
1053
1054         if(!scan)
1055         {
1056                 printf("MM_FreePtr: Block not found!\n");
1057                 return;
1058         }
1059
1060         last->next = scan->next;
1061
1062         FREEBLOCK(scan);
1063         //MM_FreeBlock(scan, mm);
1064 }
1065 //==========================================================================
1066
1067 /*
1068 =====================
1069 =
1070 = MM_SetPurge
1071 =
1072 = Sets the purge level for a block (locked blocks cannot be made purgable)
1073 =
1074 =====================
1075 */
1076
1077 void MM_SetPurge(memptr *baseptr, int purge, mminfo_t *mm)
1078 {
1079         mmblocktype huge *start;
1080
1081         start = mm->mmrover;
1082
1083         do
1084         {
1085                 if(mm->mmrover->useptr == baseptr)
1086                         break;
1087
1088                 mm->mmrover = mm->mmrover->next;
1089
1090                 if(!mm->mmrover)
1091                         mm->mmrover = mm->mmhead;
1092                 else if(mm->mmrover == start)
1093                 {
1094                         printf("MM_SetPurge: Block not found!");
1095                         return;
1096                 }
1097
1098         } while(1);
1099
1100         mm->mmrover->attributes &= ~PURGEBITS;
1101         mm->mmrover->attributes |= purge;
1102 }
1103
1104 //==========================================================================
1105
1106 /*
1107 =====================
1108 =
1109 = MM_SetLock
1110 =
1111 = Locks / unlocks the block
1112 =
1113 =====================
1114 */
1115
1116 void MM_SetLock(memptr *baseptr, boolean locked, mminfo_t *mm)
1117 {
1118         mmblocktype huge *start;
1119
1120         start = mm->mmrover;
1121
1122         do
1123         {
1124                 if(mm->mmrover->useptr == baseptr)
1125                         break;
1126
1127                 mm->mmrover = mm->mmrover->next;
1128
1129                 if(!mm->mmrover)
1130                         mm->mmrover = mm->mmhead;
1131                 else if(mm->mmrover == start)
1132                 {
1133                         printf("MM_SetLock: Block not found!");
1134                         return;
1135                 }
1136
1137         } while(1);
1138
1139         mm->mmrover->attributes &= ~LOCKBIT;
1140         mm->mmrover->attributes |= locked*LOCKBIT;
1141 }
1142
1143 //==========================================================================
1144
1145 /*
1146 =====================
1147 =
1148 = MM_SortMem
1149 =
1150 = Throws out all purgable stuff and compresses movable blocks
1151 =
1152 =====================
1153 */
1154
1155 void MM_SortMem(mminfo_t *mm)
1156 {
1157         mmblocktype huge *scan,huge *last,huge *next;
1158         unsigned        start,length,source,dest,oldborder;
1159         int                     playing;
1160
1161         //
1162         // lock down a currently playing sound
1163         //
1164 /*++++  playing = SD_SoundPlaying ();
1165         if(playing)
1166         {
1167                 switch (SoundMode)
1168                 {
1169                 case sdm_PC:
1170                         playing += STARTPCSOUNDS;
1171                         break;
1172                 case sdm_AdLib:
1173                         playing += STARTADLIBSOUNDS;
1174                         break;
1175                 }
1176                 MM_SetLock(&(memptr)audiosegs[playing],true);
1177         }
1178
1179
1180         SD_StopSound();*/
1181 //      oldborder = bordercolor;
1182 //      VW_ColorBorder (15);
1183
1184         if(beforesort)
1185                 beforesort();
1186
1187         scan = mm->mmhead;
1188
1189         last = NULL;            // shut up compiler warning
1190
1191         while(scan)
1192         {
1193                 if(scan->attributes & LOCKBIT)
1194                 {
1195                 //
1196                 // block is locked, so try to pile later blocks right after it
1197                 //
1198                         start = scan->start + scan->length;
1199                 }
1200                 else
1201                 {
1202                         if(scan->attributes & PURGEBITS)
1203                         {
1204                         //
1205                         // throw out the purgable block
1206                         //
1207                                 next = scan->next;
1208                                 FREEBLOCK(scan);
1209                                 //MM_FreeBlock(scan, mm);
1210                                 last->next = next;
1211                                 scan = next;
1212                                 continue;
1213                         }
1214                         else
1215                         {
1216                         //
1217                         // push the non purgable block on top of the last moved block
1218                         //
1219                                 if(scan->start != start)
1220                                 {
1221                                         length = scan->length;
1222                                         source = scan->start;
1223                                         dest = start;
1224                                         while(length > 0xf00)
1225                                         {
1226                                                 movedata(source,0,dest,0,0xf00*16);
1227                                                 length -= 0xf00;
1228                                                 source += 0xf00;
1229                                                 dest += 0xf00;
1230                                         }
1231                                         movedata(source,0,dest,0,length*16);
1232
1233                                         scan->start = start;
1234                                         *(unsigned *)scan->useptr = start;
1235                                 }
1236                                 start = scan->start + scan->length;
1237                         }
1238                 }
1239
1240                 last = scan;
1241                 scan = scan->next;              // go to next block
1242         }
1243
1244         mm->mmrover = mm->mmhead;
1245
1246         if(aftersort)
1247                 aftersort();
1248
1249 //      VW_ColorBorder (oldborder);
1250
1251 /*++++  if(playing)
1252                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
1253 }
1254
1255
1256 //==========================================================================
1257
1258 //****#if 0
1259 /*
1260 =====================
1261 =
1262 = MM_ShowMemory
1263 =
1264 =====================
1265 */
1266
1267 void MM_ShowMemory(global_game_variables_t *gvar,/*page_t *page, */mminfo_t *mm)
1268 {
1269         mmblocktype huge *scan;
1270 //++++  word color;
1271         word temp;
1272         long    end,owner;
1273 //++++  word chx,chy;
1274         byte    scratch[160],str[16];
1275
1276 //****  VW_SetDefaultColors();
1277 //****  VW_SetLineWidth(40);
1278 //++++mh        temp = bufferofs;
1279 //++++mh        bufferofs = 0;
1280 //****  VW_SetScreen (0,0);
1281
1282         scan = mm->mmhead;
1283
1284         end = -1;
1285
1286 CA_OpenDebug (gvar);
1287
1288 //++++  chx=0;
1289 //++++  chy=0;
1290
1291         while(scan)
1292         {
1293 /*++++          if(scan->attributes & PURGEBITS)
1294                         color = 5;              // dark purple = purgable
1295                 else
1296                         color = 9;              // medium blue = non purgable
1297                 if(scan->attributes & LOCKBIT)
1298                         color = 12;             // red = locked*/
1299                 if(scan->start<=end)
1300                 {
1301                         //printf(");
1302                         write(gvar->handle.debughandle,"\nMM_ShowMemory: Memory block order currupted!\n",strlen("\nMM_ShowMemory: Memory block order currupted!\n"));
1303                         //modexprint(&page, chx, chy, 1, 0, 24, "\nMM_ShowMemory: Memory block order currupted!\n");
1304                         return;
1305                 }
1306                 end = scan->start+scan->length-1;
1307 //++++          chy = scan->start/320;
1308 //++++          chx = scan->start%320;
1309                                 //modexhlin(page, scan->start, (unsigned)end, chy, color);
1310                                 //for(chx=scan->start;chx+4>=(word)end;chx+=4)
1311                                 //{
1312 //++++                                  modexClearRegion(page, chx, chy, 4, 4, color);
1313                                 //}
1314
1315 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1316
1317 //++++          VW_Plot(scan->start,0,15);
1318 //++++                          modexClearRegion(page, chx, chy, 4, 4, 15);
1319                 if(scan->next->start > end+1)
1320 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1321                         //for(chx=scan->next->start;chx+4>=(word)end+1;chx+=4)
1322                         //{
1323 //++++                          chx+=scan->next->start;
1324 //++++                          modexClearRegion(page, chx, chy, 4, 4, 2);
1325                         //}
1326                                         //modexhlin(page, end+1,scan->next->start, chy, 0);
1327
1328 /*
1329                 end = scan->length-1;
1330                 y = scan->start/320;
1331                 x = scan->start%320;
1332                 VW_Hlin(x,x+end,y,color);
1333                 VW_Plot(x,y,15);
1334                 if (scan->next && scan->next->start > end+1)
1335                         VW_Hlin(x+end+1,x+(scan->next->start-scan->start),y,0); // black = free
1336 */
1337
1338 //****#if 0
1339 //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!
1340 strcpy(scratch,"Seg:");
1341 ultoa (scan->start,str,16);
1342 strcat (scratch,str);
1343 strcat (scratch,"\tSize:");
1344 ultoa ((dword)scan->length,str,10);
1345 strcat (scratch,str);
1346 strcat (scratch,"\tOwner:0x");
1347 owner = (unsigned)scan->useptr;
1348 ultoa (owner,str,16);
1349 strcat (scratch,str);
1350 strcat (scratch,"\n");
1351 write(gvar->handle.debughandle,scratch,strlen(scratch));
1352 //modexprint(page, chx, chy, 1, 0, 24, &scratch);
1353 //++++chy+=4;
1354 //fprintf(stdout, "%s", scratch);
1355 //****#endif
1356
1357                 scan = scan->next;
1358         }
1359
1360 CA_CloseDebug (gvar);
1361
1362 //++++mh        IN_Ack();
1363 //****  VW_SetLineWidth(64);
1364 //++++mh        bufferofs = temp;
1365 }
1366 //****#endif
1367
1368 //==========================================================================
1369
1370 /*
1371 =====================
1372 =
1373 = MM_DumpData
1374 =
1375 =====================
1376 */
1377
1378 void MM_DumpData(mminfo_t *mm)
1379 {
1380         mmblocktype huge *scan,huge *best;
1381         long    lowest,oldlowest;
1382         word    owner;
1383         byte    lock,purge;
1384         FILE    *dumpfile;
1385
1386
1387         //++++free(mm->nearheap);
1388         dumpfile = fopen ("mmdump.16","w");
1389         if (!dumpfile){
1390                 printf("MM_DumpData: Couldn't open MMDUMP.16!\n");
1391                 return;
1392         }
1393
1394         lowest = -1;
1395         do
1396         {
1397                 oldlowest = lowest;
1398                 lowest = 0xffff;
1399
1400                 scan = mm->mmhead;
1401                 while (scan)
1402                 {
1403                         owner = (word)scan->useptr;
1404
1405                         if (owner && owner<lowest && owner > oldlowest)
1406                         {
1407                                 best = scan;
1408                                 lowest = owner;
1409                         }
1410
1411                         scan = scan->next;
1412                 }
1413
1414                 if (lowest != 0xffff)
1415                 {
1416                         if (best->attributes & PURGEBITS)
1417                                 purge = 'P';
1418                         else
1419                                 purge = '-';
1420                         if (best->attributes & LOCKBIT)
1421                                 lock = 'L';
1422                         else
1423                                 lock = '-';
1424                         fprintf (dumpfile,"0x%p (%c%c) = %u\n"
1425                         ,(word)lowest,lock,purge,best->length);
1426                 }
1427
1428         } while (lowest != 0xffff);
1429
1430         fclose(dumpfile);
1431         printf("MMDUMP.16 created.\n");
1432 }
1433
1434 //==========================================================================
1435
1436
1437 /*
1438 ======================
1439 =
1440 = MM_UnusedMemory
1441 =
1442 = Returns the total free space without purging
1443 =
1444 ======================
1445 */
1446
1447 dword MM_UnusedMemory(mminfo_t *mm)
1448 {
1449         dword free;
1450         mmblocktype huge *scan;
1451
1452         free = 0;
1453         scan = mm->mmhead;
1454
1455         while(scan->next)
1456         {
1457                 free += scan->next->start - (scan->start + scan->length);
1458                 scan = scan->next;
1459         }
1460
1461         return free*16lu;
1462 //      return free;
1463 }
1464
1465 //==========================================================================
1466
1467
1468 /*
1469 ======================
1470 =
1471 = MM_TotalFree
1472 =
1473 = Returns the total free space with purging
1474 =
1475 ======================
1476 */
1477
1478 dword MM_TotalFree(mminfo_t *mm)
1479 {
1480         dword free;
1481         mmblocktype huge *scan;
1482
1483         free = 0;
1484         scan = mm->mmhead;
1485
1486         while(scan->next)
1487         {
1488                 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1489                         free += scan->length;
1490                 free += scan->next->start - (scan->start + scan->length);
1491                 scan = scan->next;
1492         }
1493
1494         return free*16lu;
1495 //      return free;
1496 }
1497
1498 //==========================================================================
1499
1500 /*
1501 =====================
1502 =
1503 = MM_Report
1504 =
1505 =====================
1506 */
1507
1508 void MM_Report(/*page_t *page, */mminfo_t *mm, mminfotype *mmi)
1509 {
1510         if(MML_CheckForEMS())
1511         {
1512                 printf("EMM v%x.%x available\n", mm->EMSVer>>4,mm->EMSVer&0x0F);
1513                 printf("totalEMSpages=%u\n", mm->totalEMSpages);
1514                 printf("freeEMSpages=%u\n", mm->freeEMSpages);
1515                 printf("EMSpageframe=%x\n", mm->EMSpageframe);
1516         }
1517         if(MML_CheckForXMS(mm)) printf("XMSaddr=%X\n", *XMSaddr);
1518         printf("near=%lu\n", mmi->nearheap);
1519         printf("far=%lu\n", mmi->farheap);
1520         printf("EMSmem=%lu\n", mmi->EMSmem);
1521         printf("XMSmem=%lu\n", mmi->XMSmem);
1522         printf("mainmem=%lu\n", mmi->mainmem);
1523         printf("UnusedMemory=%lu\n", MM_UnusedMemory(mm));
1524         printf("TotalFree=%lu\n", MM_TotalFree(mm));
1525         //mmi->nearheap+mmi->farheap+
1526         printf("TotalUsed=%lu\n", mmi->mainmem+mmi->EMSmem+mmi->XMSmem);//+);
1527 //      printf("\n");
1528 //      printf("UnusedMemory=%lu kb\n", MM_UnusedMemory()/10248);
1529 //      printf("TotalFree=%lu kb\n", MM_TotalFree()/10248);
1530 }
1531
1532 //==========================================================================
1533
1534 /*
1535 =====================
1536 =
1537 = MM_EMSerr
1538 =
1539 =====================
1540 */
1541
1542 void MM_EMSerr(byte *stri, byte err)
1543 {
1544         //Returns a text string describing the error code in EMS.Error.
1545         switch(err)
1546         {
1547                 case 0x0:
1548                         strcat(stri, "successful");
1549                 break;
1550                 case 0x80:
1551                         strcat(stri, "internal error");
1552                 break;
1553                 case 0x81:
1554                         strcat(stri, "hardware malfunction");
1555                 break;
1556                 case 0x82:
1557                         strcat(stri, "busy .. retry later");
1558                 break;
1559                 case 0x83:
1560                         strcat(stri, "invalid handle");
1561                 break;
1562                 case 0x84:
1563                         strcat(stri, "undefined function requested by application");
1564                 break;
1565                 case 0x85:
1566                         strcat(stri, "no more handles available");
1567                 break;
1568                 case 0x86:
1569                         strcat(stri, "error in save or restore of mapping context");
1570                 break;
1571                 case 0x87:
1572                         strcat(stri, "insufficient memory pages in system");
1573                 break;
1574                 case 0x88:
1575                         strcat(stri, "insufficient memory pages available");
1576                 break;
1577                 case 0x89:
1578                         strcat(stri, "zero pages requested");
1579                 break;
1580                 case 0x8A:
1581                         strcat(stri, "invalid logical page number encountered");
1582                 break;
1583                 case 0x8B:
1584                         strcat(stri, "invalid physical page number encountered");
1585                 break;
1586                 case 0x8C:
1587                         strcat(stri, "page-mapping hardware state save area is full");
1588                 break;
1589                 case 0x8D:
1590                         strcat(stri, "save of mapping context failed");
1591                 break;
1592                 case 0x8E:
1593                         strcat(stri, "restore of mapping context failed");
1594                 break;
1595                 case 0x8F:
1596                         strcat(stri, "undefined subfunction");
1597                 break;
1598                 case 0x90:
1599                         strcat(stri, "undefined attribute type");
1600                 break;
1601                 case 0x91:
1602                         strcat(stri, "feature not supported");
1603                 break;
1604                 case 0x92:
1605                         strcat(stri, "successful, but a portion of the source region has been overwritten");
1606                 break;
1607                 case 0x93:
1608                         strcat(stri, "length of source or destination region exceeds length of region allocated to either source or destination handle");
1609                 break;
1610                 case 0x94:
1611                         strcat(stri, "conventional and expanded memory regions overlap");
1612                 break;
1613                 case 0x95:
1614                         strcat(stri, "offset within logical page exceeds size of logical page");
1615                 break;
1616                 case 0x96:
1617                         strcat(stri, "region length exceeds 1 MB");
1618                 break;
1619                 case 0x97:
1620                         strcat(stri, "source and destination EMS regions have same handle and overlap");
1621                 break;
1622                 case 0x98:
1623                         strcat(stri, "memory source or destination type undefined");
1624                 break;
1625                 case 0x9A:
1626                         strcat(stri, "specified alternate map register or DMA register set not supported");
1627                 break;
1628                 case 0x9B:
1629                         strcat(stri, "all alternate map register or DMA register sets currently allocated");
1630                 break;
1631                 case 0x9C:
1632                         strcat(stri, "alternate map register or DMA register sets not supported");
1633                 break;
1634                 case 0x9D:
1635                         strcat(stri, "undefined or unallocated alternate map register or DMA register set");
1636                 break;
1637                 case 0x9E:
1638                         strcat(stri, "dedicated DMA channels not supported");
1639                 break;
1640                 case 0x9F:
1641                         strcat(stri, "specified dedicated DMA channel not supported");
1642                 break;
1643                 case 0xA0:
1644                         strcat(stri, "no such handle name");
1645                 break;
1646                 case 0xA1:
1647                         strcat(stri, "a handle found had no name, or duplicate handle name");
1648                 break;
1649                 case 0xA2:
1650                         strcat(stri, "attempted to wrap around 1M conventional address space");
1651                 break;
1652                 case 0xA3:
1653                         strcat(stri, "source array corrupted");
1654                 break;
1655                 case 0xA4:
1656                         strcat(stri, "operating system denied access");
1657                 break;
1658                 default:
1659                         strcat(stri, "undefined error");
1660         }
1661 }
1662
1663 //==========================================================================
1664
1665 /*
1666 =====================
1667 =
1668 = MM_BombOnError
1669 =
1670 =====================
1671 */
1672
1673 void MM_BombOnError(boolean bomb, mminfo_t *mm)
1674 {
1675         mm->bombonerror = bomb;
1676 }
1677
1678 /*void MM_GetNewBlock(mminfo_t *mm)
1679 {
1680         if(!mm->mmfree)
1681                 MML_ClearBlock(mm);
1682         mm->mmnew=mm->mmfree;
1683         mm->mmfree=mm->mmfree->next;
1684         if(!(mm->mmnew=mm->mmfree))
1685         {
1686                 printf("MM_GETNEWBLOCK: No free blocks!\n");
1687                 return;
1688         }
1689         mm->mmfree=mm->mmfree->next;
1690         mm->endid++;    //end of list
1691 }
1692
1693 void MM_FreeBlock(mmblocktype *x, mminfo_t *mm)
1694 {
1695         x->useptr=NULL;
1696         x->next=mm->mmfree;
1697         mm->mmfree=x;
1698         mm->endid--;    //end of list
1699 }*/
1700
1701 void MM_seguin(void)
1702 {
1703         __asm {
1704                 push    ds
1705                 mov     ax,ds
1706                 inc             ax
1707                 mov     ds,ax
1708         }
1709 }
1710
1711 void MM_segude(void)
1712 {
1713         __asm {
1714                 pop ds
1715         }
1716 }
1717
1718 /*
1719 pull data from far and put it into ds var
1720 mov ax,es:si
1721 mov x,ax
1722 */
1723 /*
1724 ss stack segment
1725 sp top of stack
1726 bp bottem of stack
1727 */