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         unsigned        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                 MM_FreeBlock(scan, mm);
 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                 mm->mmnew->next = scan->next;
 647                 scan->next = mm->mmnew;
 648                 mm->mmnew->start = segstart+seglength;
 649                 mm->mmnew->length = extra;
 650                 mm->mmnew->attributes = LOCKBIT;
 651         }//else if(segm>0) goto segu;
 652
 653 }
 654
 655 //==========================================================================
 656
 657 /*
 658 ====================
 659 =
 660 = MML_ClearBlock
 661 =
 662 = We are out of blocks, so free a purgable block
 663 =
 664 ====================
 665 */
 666
 667 void MML_ClearBlock(mminfo_t *mm)
 668 {
 669         mmblocktype huge *scan,huge *last;
 670
 671         scan = mm->mmhead->next;
 672
 673         while(scan)
 674         {
 675                 if(!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS))
 676                 {
 677                         MM_FreePtr(scan->useptr, mm);
 678                         return;
 679                 }
 680                 scan = scan->next;
 681         }
 682
 683         printf("MM_ClearBlock: No purgable blocks!\n");
 684 }
 685
 686
 687 //==========================================================================
 688
 689 /*
 690 ===================
 691 =
 692 = MM_Startup
 693 =
 694 = Grabs all space from turbo with malloc/farmalloc
 695 = Allocates bufferseg misc buffer
 696 =
 697 ===================
 698 */
 699
 700 void MM_Startup(mminfo_t *mm, mminfotype *mmi)
 701 {
 702         int i;
 703         dword length,seglength;
 704         //dword length; word seglength;
 705         void huge       *start;
 706         word    segstart;//,endfree;
 707
 708         if(mm->mmstarted)
 709                 MM_Shutdown(mm);
 710
 711         mm->mmstarted = true;
 712         mm->bombonerror = true;
 713         mm->endid=0;
 714
 715 //
 716 // set up the linked list (everything in the free list;
 717 //
 718         //printf("              linked list making!\n");
 719         mm->mmhead = NULL;
 720         mm->mmfree = &(mm->mmblocks[0]);
 721         for(i=0;i<MAXBLOCKS-1;i++)
 722         {
 723                 mm->mmblocks[i].next = &(mm->mmblocks[i+1]);
 724         }
 725         mm->mmblocks[i].next = NULL;
 726
 727 //
 728 // locked block of all memory until we punch out free space
 729 //
 730         //printf("              newblock making!\n");
 731         MM_GetNewBlock(mm);
 732         mm->mmhead = mm->mmnew;                         // this will allways be the first node
 733         mm->mmnew->start = 0;
 734         mm->mmnew->length = 0xffff;
 735         mm->mmnew->attributes = LOCKBIT;
 736         mm->mmnew->next = NULL;
 737         mm->mmrover = mm->mmhead;
 738
 739 //
 740 // get all available near conventional memory segments
 741 //
 742 //      printf("                nearheap making!\n");
 743 #ifdef __WATCOMC__
 744         _nheapgrow();
 745         length=(dword)_memmax();//(dword)GetFreeSize();
 746         start = (void huge *)(mm->nearheap = _nmalloc(length));
 747 #endif
 748 #ifdef __BORLANDC__
 749         length=coreleft();
 750         start = (void huge *)(mm->nearheap = malloc(length));
 751 #endif
 752         length -= 16-(FP_OFF(start)&15);
 753         length -= SAVENEARHEAP;
 754         seglength = length / 16;                        // now in paragraphs
 755         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 756         MML_UseSpace(segstart,seglength, mm);
 757         mmi->nearheap = length;
 758         printf("start=%Fp       segstart=%x     seglen=%l       len=%l\n", start, segstart, seglength, length);
 759         //heapdump();
 760
 761 //
 762 // get all available far conventional memory segments
 763 //
 764 //      printf("                farheap making!\n");
 765 #ifdef __WATCOMC__
 766         _fheapgrow();
 767         length=(dword)GetFarFreeSize();//0xffffUL*4UL;
 768 #endif
 769 #ifdef __BORLANDC__
 770         length=farcoreleft();
 771 #endif
 772         //start = mm->farheap = halloc(length, 1);
 773         start = mm->farheap = _fmalloc(length);
 774         length -= 16-(FP_OFF(start)&15);
 775         length -= SAVEFARHEAP;
 776         seglength = length / 16;                        // now in paragraphs
 777         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 778         MML_UseSpace(segstart,seglength, mm);
 779         mmi->farheap = length;
 780         printf("start=%Fp       segstart=%x     seglen=%l       len=%l\n", start, segstart, seglength, length);
 781         //heapdump();
 782
 783         mmi->mainmem = mmi->nearheap + mmi->farheap;
 784
 785 //      getch();
 786
 787 //goto xmsskip;
 788
 789 //
 790 // detect EMS and allocate up to 64K at page frame
 791 //
 792 //printf("              EMS1\n");
 793 //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!
 794         mmi->EMSmem = 0;
 795         for(i = 1;i <
 796 #ifdef __WATCOMC__
 797         __argc
 798 #endif
 799 #ifdef __BORLANDC__
 800         _argc
 801 #endif
 802         ;i++)
 803         {
 804                 if(US_CheckParm(
 805 #ifdef __WATCOMC__
 806         __argv[i]
 807 #endif
 808 #ifdef __BORLANDC__
 809         _argv[i]
 810 #endif
 811                         ,ParmStringsexmm) == 0)
 812                         goto emsskip;                           // param NOEMS
 813         }
 814 //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!
 815         if(MML_CheckForEMS())
 816         {
 817 //printf("              EMS2\n");
 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                 MML_SetupEMS(mm);                                       // allocate space
 820 //printf("              EMS3\n");
 821 //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!
 822                 //TODO: EMS4! AND EMS 3.2 MASSIVE DATA HANDLMENT!
 823                 MML_UseSpace(mm->EMSpageframe,(MAPPAGES)*0x4000lu, mm);
 824 //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!
 825 //printf("              EMS4\n");
 826                 //if(mm->EMSVer<0x40)
 827                         MM_MapEMS(mm, mmi);                                     // map in used pages
 828                 //else
 829                         //MM_MapXEMS(mm, mmi);                                  // map in used pages
 830         }
 831
 832 mmi->XMSmem=0;
 833 goto xmsskip;
 834
 835 //
 836 // detect XMS and get upper memory blocks
 837 //
 838 emsskip:
 839         mmi->XMSmem = 0;
 840         for(i = 1;i <
 841 #ifdef __WATCOMC__
 842         __argc
 843 #endif
 844 #ifdef __BORLANDC__
 845         _argc
 846 #endif
 847         ;i++)
 848         {
 849                 if(US_CheckParm(
 850 #ifdef __WATCOMC__
 851         __argv[i]
 852 #endif
 853 #ifdef __BORLANDC__
 854         _argv[i]
 855 #endif
 856                         ,ParmStringsexmm) == 0)
 857                         goto xmsskip;                           // param NOXMS
 858         }
 859 //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!
 860         if(MML_CheckForXMS(mm))
 861         {
 862 //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!
 863 //printf("              XMS!\n");
 864                 MML_SetupXMS(mm, mmi);                                  // allocate as many UMBs as possible
 865         }
 866
 867 //
 868 // allocate the misc buffer
 869 //
 870 xmsskip:
 871         mm->mmrover = mm->mmhead;               // start looking for space after low block
 872
 873         MM_GetPtr(&(mm->bufferseg),BUFFERSIZE, mm, mmi);
 874 }
 875
 876 //==========================================================================
 877
 878 /*
 879 ====================
 880 =
 881 = MM_Shutdown
 882 =
 883 = Frees all conventional, EMS, and XMS allocated
 884 =
 885 ====================
 886 */
 887
 888 void MM_Shutdown(mminfo_t *mm)
 889 {
 890         if(!(mm->mmstarted))
 891                 return;
 892
 893         _ffree(mm->farheap);    printf("                far freed\n");
 894 #ifdef __WATCOMC__
 895         _nfree(mm->nearheap);   printf("                near freed\n");
 896 #endif
 897 #ifdef __BORLANDC__
 898         free(mm->nearheap);     printf("                near freed\n");
 899 #endif
 900         if(MML_CheckForEMS()){ MML_ShutdownEMS(mm); printf("            EMS freed\n"); }
 901         if(MML_CheckForXMS(mm)){ MML_ShutdownXMS(mm); printf("          XMS freed\n"); }
 902 }
 903
 904 //==========================================================================
 905
 906 /*
 907 ====================
 908 =
 909 = MM_GetPtr
 910 =
 911 = Allocates an unlocked, unpurgable block
 912 =
 913 ====================
 914 */
 915
 916 void MM_GetPtr(memptr *baseptr,dword size, mminfo_t *mm, mminfotype *mmi)
 917 {
 918         mmblocktype huge *scan,huge *lastscan,huge *endscan,huge *purge,huge *next;
 919         int                     search;
 920         dword   needed;
 921         word    startseg;
 922
 923         needed = (size+15)/16;          // convert size from bytes to paragraphs
 924 printf(".");    //0000
 925         MM_GetNewBlock(mm);                             // fill in start and next after a spot is found
 926         mm->mmnew->length = needed;
 927         mm->mmnew->useptr = baseptr;
 928         mm->mmnew->attributes = BASEATTRIBUTES;
 929 printf(".");    //0000
 930         for(search = 0; search<mm->endid; search++)
 931         {
 932 printf("        [case]");       //0000
 933         //
 934         // first search:        try to allocate right after the rover, then on up
 935         // second search:       search from the head pointer up to the rover
 936         // third search:        compress memory, then scan from start
 937                 if(search == 1 && mm->mmrover == mm->mmhead)
 938                         search++;
 939
 940                 switch(search)
 941                 {
 942                 case 0:
 943 printf("0       ");     //0000
 944                         lastscan = mm->mmrover;
 945                         scan = mm->mmrover->next;
 946                         endscan = NULL;
 947                         break;
 948                 case 1:
 949 printf("1       ");     //0000
 950                         lastscan = mm->mmhead;
 951                         scan = mm->mmhead->next;
 952                         endscan = mm->mmrover;
 953                         break;
 954                 case 2:
 955 printf("2       ");     //0000
 956                         MM_SortMem(mm);
 957                         lastscan = mm->mmhead;
 958                         scan = mm->mmhead->next;
 959                         endscan = NULL;
 960                         break;
 961                 }
 962
 963                 startseg = lastscan->start + (word)lastscan->length;
 964
 965                 while(scan != endscan)
 966                 {
 967 //printf(",");  //0000
 968                         if(scan->start - startseg >= needed)
 969                         {
 970 printf(".");    //0000
 971                         //
 972                         // got enough space between the end of lastscan and
 973                         // the start of scan, so throw out anything in the middle
 974                         // and allocate the new block
 975                         //
 976                                 purge = lastscan->next;
 977                                 lastscan->next = mm->mmnew;
 978                                 mm->mmnew->start = *(word *)baseptr = startseg;
 979                                 mm->mmnew->next = scan;
 980                                 while(purge != scan)
 981                                 {       // free the purgable block
 982 printf("                freeing block~\n");     //0000
 983                                         next = purge->next;
 984                                         MM_FreeBlock(purge, mm);
 985                                         purge = next;           // purge another if not at scan
 986                                 }
 987                                 mm->mmrover = mm->mmnew;
 988                                 return; // good allocation!
 989                         }
 990
 991                         //
 992                         // if this block is purge level zero or locked, skip past it
 993                         //
 994                         if((scan->attributes & LOCKBIT)
 995                                 || !(scan->attributes & PURGEBITS) )
 996                         {
 997 printf("        [lock] ");      //0000
 998 printf("len=%lu ", scan->length);
 999                                 lastscan = scan;
1000                                 startseg = lastscan->start + (word)lastscan->length;
1001                         }
1002
1003 printf("\n");
1004                         scan=scan->next;                // look at next line
1005                 }
1006         }
1007
1008         if (mm->bombonerror)
1009         {
1010 #ifdef __WATCOMC__
1011                 heapdump();
1012 #endif
1013                 printf(OUT_OF_MEM_MSG,(size-mmi->nearheap));
1014                 printf("for stability reasons the program will shut down! wwww\n");
1015                 printf("                endid=%u\n",(mm->endid));
1016                 MM_Shutdown(mm);
1017                 exit(-1);
1018         }
1019         else
1020                 mm->mmerror = true;
1021 }
1022
1023 //==========================================================================
1024
1025 /*
1026 ====================
1027 =
1028 = MM_FreePtr
1029 =
1030 = Allocates an unlocked, unpurgable block
1031 =
1032 ====================
1033 */
1034
1035 void MM_FreePtr(memptr *baseptr, mminfo_t *mm)
1036 {
1037         mmblocktype huge *scan,huge *last;
1038
1039         last = mm->mmhead;
1040         scan = last->next;
1041
1042         if(baseptr == mm->mmrover->useptr)      // removed the last allocated block
1043                 mm->mmrover = mm->mmhead;
1044
1045         while(scan->useptr != baseptr && scan)
1046         {
1047                 last = scan;
1048                 scan = scan->next;
1049         }
1050
1051         if(!scan)
1052         {
1053                 printf("MM_FreePtr: Block not found!\n");
1054                 return;
1055         }
1056
1057         last->next = scan->next;
1058
1059         MM_FreeBlock(scan, mm);
1060 }
1061 //==========================================================================
1062
1063 /*
1064 =====================
1065 =
1066 = MM_SetPurge
1067 =
1068 = Sets the purge level for a block (locked blocks cannot be made purgable)
1069 =
1070 =====================
1071 */
1072
1073 void MM_SetPurge(memptr *baseptr, int purge, mminfo_t *mm)
1074 {
1075         mmblocktype huge *start;
1076
1077         start = mm->mmrover;
1078
1079         do
1080         {
1081                 if(mm->mmrover->useptr == baseptr)
1082                         break;
1083
1084                 mm->mmrover = mm->mmrover->next;
1085
1086                 if(!mm->mmrover)
1087                         mm->mmrover = mm->mmhead;
1088                 else if(mm->mmrover == start)
1089                 {
1090                         printf("MM_SetPurge: Block not found!");
1091                         return;
1092                 }
1093
1094         } while(1);
1095
1096         mm->mmrover->attributes &= ~PURGEBITS;
1097         mm->mmrover->attributes |= purge;
1098 }
1099
1100 //==========================================================================
1101
1102 /*
1103 =====================
1104 =
1105 = MM_SetLock
1106 =
1107 = Locks / unlocks the block
1108 =
1109 =====================
1110 */
1111
1112 void MM_SetLock(memptr *baseptr, boolean locked, mminfo_t *mm)
1113 {
1114         mmblocktype huge *start;
1115
1116         start = mm->mmrover;
1117
1118         do
1119         {
1120                 if(mm->mmrover->useptr == baseptr)
1121                         break;
1122
1123                 mm->mmrover = mm->mmrover->next;
1124
1125                 if(!mm->mmrover)
1126                         mm->mmrover = mm->mmhead;
1127                 else if(mm->mmrover == start)
1128                 {
1129                         printf("MM_SetLock: Block not found!");
1130                         return;
1131                 }
1132
1133         } while(1);
1134
1135         mm->mmrover->attributes &= ~LOCKBIT;
1136         mm->mmrover->attributes |= locked*LOCKBIT;
1137 }
1138
1139 //==========================================================================
1140
1141 /*
1142 =====================
1143 =
1144 = MM_SortMem
1145 =
1146 = Throws out all purgable stuff and compresses movable blocks
1147 =
1148 =====================
1149 */
1150
1151 void MM_SortMem(mminfo_t *mm)
1152 {
1153         mmblocktype huge *scan,huge *last,huge *next;
1154         unsigned        start,length,source,dest,oldborder;
1155         int                     playing;
1156
1157         //
1158         // lock down a currently playing sound
1159         //
1160 /*++++  playing = SD_SoundPlaying ();
1161         if(playing)
1162         {
1163                 switch (SoundMode)
1164                 {
1165                 case sdm_PC:
1166                         playing += STARTPCSOUNDS;
1167                         break;
1168                 case sdm_AdLib:
1169                         playing += STARTADLIBSOUNDS;
1170                         break;
1171                 }
1172                 MM_SetLock(&(memptr)audiosegs[playing],true);
1173         }
1174
1175
1176         SD_StopSound();*/
1177 //      oldborder = bordercolor;
1178 //      VW_ColorBorder (15);
1179
1180         if(beforesort)
1181                 beforesort();
1182
1183         scan = mm->mmhead;
1184
1185         last = NULL;            // shut up compiler warning
1186
1187         while(scan)
1188         {
1189                 if(scan->attributes & LOCKBIT)
1190                 {
1191                 //
1192                 // block is locked, so try to pile later blocks right after it
1193                 //
1194                         start = scan->start + scan->length;
1195                 }
1196                 else
1197                 {
1198                         if(scan->attributes & PURGEBITS)
1199                         {
1200                         //
1201                         // throw out the purgable block
1202                         //
1203                                 next = scan->next;
1204                                 MM_FreeBlock(scan, mm);
1205                                 last->next = next;
1206                                 scan = next;
1207                                 continue;
1208                         }
1209                         else
1210                         {
1211                         //
1212                         // push the non purgable block on top of the last moved block
1213                         //
1214                                 if(scan->start != start)
1215                                 {
1216                                         length = scan->length;
1217                                         source = scan->start;
1218                                         dest = start;
1219                                         while(length > 0xf00)
1220                                         {
1221                                                 movedata(source,0,dest,0,0xf00*16);
1222                                                 length -= 0xf00;
1223                                                 source += 0xf00;
1224                                                 dest += 0xf00;
1225                                         }
1226                                         movedata(source,0,dest,0,length*16);
1227
1228                                         scan->start = start;
1229                                         *(unsigned *)scan->useptr = start;
1230                                 }
1231                                 start = scan->start + scan->length;
1232                         }
1233                 }
1234
1235                 last = scan;
1236                 scan = scan->next;              // go to next block
1237         }
1238
1239         mm->mmrover = mm->mmhead;
1240
1241         if(aftersort)
1242                 aftersort();
1243
1244 //      VW_ColorBorder (oldborder);
1245
1246 /*++++  if(playing)
1247                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
1248 }
1249
1250
1251 //==========================================================================
1252
1253 //****#if 0
1254 /*
1255 =====================
1256 =
1257 = MM_ShowMemory
1258 =
1259 =====================
1260 */
1261
1262 void MM_ShowMemory(/*page_t *page, */mminfo_t *mm)
1263 {
1264         mmblocktype huge *scan;
1265 //++++  word color;
1266         word temp;
1267         long    end,owner;
1268 //++++  word chx,chy;
1269         byte    scratch[160],str[16];
1270
1271 //****  VW_SetDefaultColors();
1272 //****  VW_SetLineWidth(40);
1273 //++++mh        temp = bufferofs;
1274 //++++mh        bufferofs = 0;
1275 //****  VW_SetScreen (0,0);
1276
1277         scan = mm->mmhead;
1278
1279         end = -1;
1280
1281 CA_OpenDebug ();
1282
1283 //++++  chx=0;
1284 //++++  chy=0;
1285
1286         while(scan)
1287         {
1288 /*++++          if(scan->attributes & PURGEBITS)
1289                         color = 5;              // dark purple = purgable
1290                 else
1291                         color = 9;              // medium blue = non purgable
1292                 if(scan->attributes & LOCKBIT)
1293                         color = 12;             // red = locked*/
1294                 if(scan->start<=end)
1295                 {
1296                         //printf(");
1297                         write(debughandle,"\nMM_ShowMemory: Memory block order currupted!\n",strlen("\nMM_ShowMemory: Memory block order currupted!\n"));
1298                         //modexprint(&page, chx, chy, 1, 0, 24, "\nMM_ShowMemory: Memory block order currupted!\n");
1299                         return;
1300                 }
1301                 end = scan->start+scan->length-1;
1302 //++++          chy = scan->start/320;
1303 //++++          chx = scan->start%320;
1304                                 //modexhlin(page, scan->start, (unsigned)end, chy, color);
1305                                 //for(chx=scan->start;chx+4>=(word)end;chx+=4)
1306                                 //{
1307 //++++                                  modexClearRegion(page, chx, chy, 4, 4, color);
1308                                 //}
1309
1310 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1311
1312 //++++          VW_Plot(scan->start,0,15);
1313 //++++                          modexClearRegion(page, chx, chy, 4, 4, 15);
1314                 if(scan->next->start > end+1)
1315 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1316                         //for(chx=scan->next->start;chx+4>=(word)end+1;chx+=4)
1317                         //{
1318 //++++                          chx+=scan->next->start;
1319 //++++                          modexClearRegion(page, chx, chy, 4, 4, 2);
1320                         //}
1321                                         //modexhlin(page, end+1,scan->next->start, chy, 0);
1322
1323 /*
1324                 end = scan->length-1;
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                 if (scan->next && scan->next->start > end+1)
1330                         VW_Hlin(x+end+1,x+(scan->next->start-scan->start),y,0); // black = free
1331 */
1332
1333 //****#if 0
1334 //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!
1335 strcpy(scratch,"Seg:");
1336 ultoa (scan->start,str,16);
1337 strcat (scratch,str);
1338 strcat (scratch,"\tSize:");
1339 ultoa ((dword)scan->length,str,10);
1340 strcat (scratch,str);
1341 strcat (scratch,"\tOwner:0x");
1342 owner = (unsigned)scan->useptr;
1343 ultoa (owner,str,16);
1344 strcat (scratch,str);
1345 strcat (scratch,"\n");
1346 write(debughandle,scratch,strlen(scratch));
1347 //modexprint(page, chx, chy, 1, 0, 24, &scratch);
1348 //++++chy+=4;
1349 //fprintf(stdout, "%s", scratch);
1350 //****#endif
1351
1352                 scan = scan->next;
1353         }
1354
1355 CA_CloseDebug ();
1356
1357 //++++mh        IN_Ack();
1358 //****  VW_SetLineWidth(64);
1359 //++++mh        bufferofs = temp;
1360 }
1361 //****#endif
1362
1363 //==========================================================================
1364
1365 /*
1366 =====================
1367 =
1368 = MM_DumpData
1369 =
1370 =====================
1371 */
1372
1373 void MM_DumpData(mminfo_t *mm)
1374 {
1375         mmblocktype far *scan,far *best;
1376         long    lowest,oldlowest;
1377         word    owner;
1378         byte    lock,purge;
1379         FILE    *dumpfile;
1380
1381
1382         //++++free(mm->nearheap);
1383         dumpfile = fopen ("mmdump.16","w");
1384         if (!dumpfile){
1385                 printf("MM_DumpData: Couldn't open MMDUMP.16!\n");
1386                 return;
1387         }
1388
1389         lowest = -1;
1390         do
1391         {
1392                 oldlowest = lowest;
1393                 lowest = 0xffff;
1394
1395                 scan = mm->mmhead;
1396                 while (scan)
1397                 {
1398                         owner = (word)scan->useptr;
1399
1400                         if (owner && owner<lowest && owner > oldlowest)
1401                         {
1402                                 best = scan;
1403                                 lowest = owner;
1404                         }
1405
1406                         scan = scan->next;
1407                 }
1408
1409                 if (lowest != 0xffff)
1410                 {
1411                         if (best->attributes & PURGEBITS)
1412                                 purge = 'P';
1413                         else
1414                                 purge = '-';
1415                         if (best->attributes & LOCKBIT)
1416                                 lock = 'L';
1417                         else
1418                                 lock = '-';
1419                         fprintf (dumpfile,"0x%p (%c%c) = %u\n"
1420                         ,(word)lowest,lock,purge,best->length);
1421                 }
1422
1423         } while (lowest != 0xffff);
1424
1425         fclose(dumpfile);
1426         printf("MMDUMP.16 created.\n");
1427 }
1428
1429 //==========================================================================
1430
1431
1432 /*
1433 ======================
1434 =
1435 = MM_UnusedMemory
1436 =
1437 = Returns the total free space without purging
1438 =
1439 ======================
1440 */
1441
1442 dword MM_UnusedMemory(mminfo_t *mm)
1443 {
1444         dword free;
1445         mmblocktype huge *scan;
1446
1447         free = 0;
1448         scan = mm->mmhead;
1449
1450         while(scan->next)
1451         {
1452                 free += scan->next->start - (scan->start + scan->length);
1453                 scan = scan->next;
1454         }
1455
1456 //      return free*16l;
1457         return free;
1458 }
1459
1460 //==========================================================================
1461
1462
1463 /*
1464 ======================
1465 =
1466 = MM_TotalFree
1467 =
1468 = Returns the total free space with purging
1469 =
1470 ======================
1471 */
1472
1473 dword MM_TotalFree(mminfo_t *mm)
1474 {
1475         dword free;
1476         mmblocktype huge *scan;
1477
1478         free = 0;
1479         scan = mm->mmhead;
1480
1481         while(scan->next)
1482         {
1483                 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1484                         free += scan->length;
1485                 free += scan->next->start - (scan->start + scan->length);
1486                 scan = scan->next;
1487         }
1488
1489 //      return free*16l;
1490         return free;
1491 }
1492
1493 //==========================================================================
1494
1495 /*
1496 =====================
1497 =
1498 = MM_Report
1499 =
1500 =====================
1501 */
1502
1503 void MM_Report(/*page_t *page, */mminfo_t *mm, mminfotype *mmi)
1504 {
1505         if(MML_CheckForEMS())
1506         {
1507                 printf("EMM v%x.%x available\n", mm->EMSVer>>4,mm->EMSVer&0x0F);
1508                 printf("totalEMSpages=%u\n", mm->totalEMSpages);
1509                 printf("freeEMSpages=%u\n", mm->freeEMSpages);
1510                 printf("EMSpageframe=%x\n", mm->EMSpageframe);
1511         }
1512         if(MML_CheckForXMS(mm)) printf("XMSaddr=%X\n", *XMSaddr);
1513         printf("near=%lu\n", mmi->nearheap);
1514         printf("far=%lu\n", mmi->farheap);
1515         printf("EMSmem=%lu\n", mmi->EMSmem);
1516         printf("XMSmem=%lu\n", mmi->XMSmem);
1517         printf("mainmem=%lu\n", mmi->mainmem);
1518         printf("UnusedMemory=%lu\n", MM_UnusedMemory(mm));
1519         printf("TotalFree=%lu\n", MM_TotalFree(mm));
1520         //mmi->nearheap+mmi->farheap+
1521         printf("TotalUsed=%lu\n", mmi->mainmem+mmi->EMSmem+mmi->XMSmem);//+);
1522 //      printf("\n");
1523 //      printf("UnusedMemory=%lu kb\n", MM_UnusedMemory()/10248);
1524 //      printf("TotalFree=%lu kb\n", MM_TotalFree()/10248);
1525 }
1526
1527 //==========================================================================
1528
1529 /*
1530 =====================
1531 =
1532 = MM_EMSerr
1533 =
1534 =====================
1535 */
1536
1537 void MM_EMSerr(byte *stri, byte err)
1538 {
1539         //Returns a text string describing the error code in EMS.Error.
1540         switch(err)
1541         {
1542                 case 0x0:
1543                         strcat(stri, "successful");
1544                 break;
1545                 case 0x80:
1546                         strcat(stri, "internal error");
1547                 break;
1548                 case 0x81:
1549                         strcat(stri, "hardware malfunction");
1550                 break;
1551                 case 0x82:
1552                         strcat(stri, "busy .. retry later");
1553                 break;
1554                 case 0x83:
1555                         strcat(stri, "invalid handle");
1556                 break;
1557                 case 0x84:
1558                         strcat(stri, "undefined function requested by application");
1559                 break;
1560                 case 0x85:
1561                         strcat(stri, "no more handles available");
1562                 break;
1563                 case 0x86:
1564                         strcat(stri, "error in save or restore of mapping context");
1565                 break;
1566                 case 0x87:
1567                         strcat(stri, "insufficient memory pages in system");
1568                 break;
1569                 case 0x88:
1570                         strcat(stri, "insufficient memory pages available");
1571                 break;
1572                 case 0x89:
1573                         strcat(stri, "zero pages requested");
1574                 break;
1575                 case 0x8A:
1576                         strcat(stri, "invalid logical page number encountered");
1577                 break;
1578                 case 0x8B:
1579                         strcat(stri, "invalid physical page number encountered");
1580                 break;
1581                 case 0x8C:
1582                         strcat(stri, "page-mapping hardware state save area is full");
1583                 break;
1584                 case 0x8D:
1585                         strcat(stri, "save of mapping context failed");
1586                 break;
1587                 case 0x8E:
1588                         strcat(stri, "restore of mapping context failed");
1589                 break;
1590                 case 0x8F:
1591                         strcat(stri, "undefined subfunction");
1592                 break;
1593                 case 0x90:
1594                         strcat(stri, "undefined attribute type");
1595                 break;
1596                 case 0x91:
1597                         strcat(stri, "feature not supported");
1598                 break;
1599                 case 0x92:
1600                         strcat(stri, "successful, but a portion of the source region has been overwritten");
1601                 break;
1602                 case 0x93:
1603                         strcat(stri, "length of source or destination region exceeds length of region allocated to either source or destination handle");
1604                 break;
1605                 case 0x94:
1606                         strcat(stri, "conventional and expanded memory regions overlap");
1607                 break;
1608                 case 0x95:
1609                         strcat(stri, "offset within logical page exceeds size of logical page");
1610                 break;
1611                 case 0x96:
1612                         strcat(stri, "region length exceeds 1 MB");
1613                 break;
1614                 case 0x97:
1615                         strcat(stri, "source and destination EMS regions have same handle and overlap");
1616                 break;
1617                 case 0x98:
1618                         strcat(stri, "memory source or destination type undefined");
1619                 break;
1620                 case 0x9A:
1621                         strcat(stri, "specified alternate map register or DMA register set not supported");
1622                 break;
1623                 case 0x9B:
1624                         strcat(stri, "all alternate map register or DMA register sets currently allocated");
1625                 break;
1626                 case 0x9C:
1627                         strcat(stri, "alternate map register or DMA register sets not supported");
1628                 break;
1629                 case 0x9D:
1630                         strcat(stri, "undefined or unallocated alternate map register or DMA register set");
1631                 break;
1632                 case 0x9E:
1633                         strcat(stri, "dedicated DMA channels not supported");
1634                 break;
1635                 case 0x9F:
1636                         strcat(stri, "specified dedicated DMA channel not supported");
1637                 break;
1638                 case 0xA0:
1639                         strcat(stri, "no such handle name");
1640                 break;
1641                 case 0xA1:
1642                         strcat(stri, "a handle found had no name, or duplicate handle name");
1643                 break;
1644                 case 0xA2:
1645                         strcat(stri, "attempted to wrap around 1M conventional address space");
1646                 break;
1647                 case 0xA3:
1648                         strcat(stri, "source array corrupted");
1649                 break;
1650                 case 0xA4:
1651                         strcat(stri, "operating system denied access");
1652                 break;
1653                 default:
1654                         strcat(stri, "undefined error");
1655         }
1656 }
1657
1658 //==========================================================================
1659
1660 /*
1661 =====================
1662 =
1663 = MM_BombOnError
1664 =
1665 =====================
1666 */
1667
1668 void MM_BombOnError(boolean bomb, mminfo_t *mm)
1669 {
1670         mm->bombonerror = bomb;
1671 }
1672
1673 void MM_GetNewBlock(mminfo_t *mm)
1674 {
1675         if(!mm->mmfree)
1676                 MML_ClearBlock(mm);
1677         mm->mmnew=mm->mmfree;
1678         mm->mmfree=mm->mmfree->next;
1679         if(!(mm->mmnew=mm->mmfree))
1680         {
1681                 printf("MM_GETNEWBLOCK: No free blocks!\n");
1682                 return;
1683         }
1684         mm->mmfree=mm->mmfree->next;
1685         mm->endid++;    //end of list
1686 }
1687
1688 void MM_FreeBlock(mmblocktype *x, mminfo_t *mm)
1689 {
1690         x->useptr=NULL;
1691         x->next=mm->mmfree;
1692         mm->mmfree=x;
1693         mm->endid--;    //end of list
1694 }
1695
1696 void MM_seguin(void)
1697 {
1698         __asm {
1699                 push    ds
1700                 mov     ax,ds
1701                 inc             ax
1702                 mov     ds,ax
1703         }
1704 }
1705
1706 void MM_segude(void)
1707 {
1708         __asm {
1709                 pop ds
1710         }
1711 }
1712
1713 /*
1714 pull data from far and put it into ds var
1715 mov ax,es:si
1716 mov x,ax
1717 */
1718 /*
1719 ss stack segment
1720 sp top of stack
1721 bp bottem of stack
1722 */