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                 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 mmi->XMSmem=0;
 837 goto xmsskip;
 838
 839 //
 840 // detect XMS and get upper memory blocks
 841 //
 842 emsskip:
 843         mmi->XMSmem = 0;
 844         for(i = 1;i <
 845 #ifdef __WATCOMC__
 846         __argc
 847 #endif
 848 #ifdef __BORLANDC__
 849         _argc
 850 #endif
 851         ;i++)
 852         {
 853                 if(US_CheckParm(
 854 #ifdef __WATCOMC__
 855         __argv[i]
 856 #endif
 857 #ifdef __BORLANDC__
 858         _argv[i]
 859 #endif
 860                         ,ParmStringsexmm) == 0)
 861                         goto xmsskip;                           // param NOXMS
 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         if(MML_CheckForXMS(mm))
 865         {
 866 //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!
 867 //printf("              XMS!\n");
 868                 MML_SetupXMS(mm, mmi);                                  // allocate as many UMBs as possible
 869         }
 870
 871 //
 872 // allocate the misc buffer
 873 //
 874 xmsskip:
 875         mm->mmrover = mm->mmhead;               // start looking for space after low block
 876
 877         MM_GetPtr(&(mm->bufferseg),BUFFERSIZE, mm, mmi);
 878 }
 879
 880 //==========================================================================
 881
 882 /*
 883 ====================
 884 =
 885 = MM_Shutdown
 886 =
 887 = Frees all conventional, EMS, and XMS allocated
 888 =
 889 ====================
 890 */
 891
 892 void MM_Shutdown(mminfo_t *mm)
 893 {
 894         if(!(mm->mmstarted))
 895                 return;
 896
 897         _ffree(mm->farheap);    printf("                far freed\n");
 898 #ifdef __WATCOMC__
 899         _nfree(mm->nearheap);   printf("                near freed\n");
 900 #endif
 901 #ifdef __BORLANDC__
 902         free(mm->nearheap);     printf("                near freed\n");
 903 #endif
 904         if(MML_CheckForEMS()){ MML_ShutdownEMS(mm); printf("            EMS freed\n"); }
 905         if(MML_CheckForXMS(mm)){ MML_ShutdownXMS(mm); printf("          XMS freed\n"); }
 906 }
 907
 908 //==========================================================================
 909
 910 /*
 911 ====================
 912 =
 913 = MM_GetPtr
 914 =
 915 = Allocates an unlocked, unpurgable block
 916 =
 917 ====================
 918 */
 919
 920 void MM_GetPtr(memptr *baseptr,dword size, mminfo_t *mm, mminfotype *mmi)
 921 {
 922         mmblocktype huge *scan,huge *lastscan,huge *endscan,huge *purge,huge *next;
 923         int                     search;
 924         dword   needed;
 925         word    startseg;
 926
 927         needed = (size+15)/16;          // convert size from bytes to paragraphs
 928 printf(".");    //0000
 929         //MM_GetNewBlock(mm);
 930         GETNEWBLOCK;                            // fill in start and next after a spot is found
 931         mm->mmnew->length = needed;
 932         mm->mmnew->useptr = baseptr;
 933         mm->mmnew->attributes = BASEATTRIBUTES;
 934 printf(".");    //0000
 935         for(search = 0; search<mm->endid; search++)
 936         {
 937 printf("        [case]");       //0000
 938         //
 939         // first search:        try to allocate right after the rover, then on up
 940         // second search:       search from the head pointer up to the rover
 941         // third search:        compress memory, then scan from start
 942                 if(search == 1 && mm->mmrover == mm->mmhead)
 943                         search++;
 944
 945                 switch(search)
 946                 {
 947                 case 0:
 948 printf("0       ");     //0000
 949                         lastscan = mm->mmrover;
 950                         scan = mm->mmrover->next;
 951                         endscan = NULL;
 952                         break;
 953                 case 1:
 954 printf("1       ");     //0000
 955                         lastscan = mm->mmhead;
 956                         scan = mm->mmhead->next;
 957                         endscan = mm->mmrover;
 958                         break;
 959                 case 2:
 960 printf("2       ");     //0000
 961                         MM_SortMem(mm);
 962                         lastscan = mm->mmhead;
 963                         scan = mm->mmhead->next;
 964                         endscan = NULL;
 965                         break;
 966                 }
 967
 968                 startseg = lastscan->start + (word)lastscan->length;
 969
 970                 while(scan != endscan)
 971                 {
 972 //printf(",");  //0000
 973                         if(scan->start - startseg >= needed)
 974                         {
 975 printf(".");    //0000
 976                         //
 977                         // got enough space between the end of lastscan and
 978                         // the start of scan, so throw out anything in the middle
 979                         // and allocate the new block
 980                         //
 981                                 purge = lastscan->next;
 982                                 lastscan->next = mm->mmnew;
 983                                 mm->mmnew->start = *(word *)baseptr = startseg;
 984                                 mm->mmnew->next = scan;
 985                                 while(purge != scan)
 986                                 {       // free the purgable block
 987 printf("                freeing block~\n");     //0000
 988                                         next = purge->next;
 989                                         FREEBLOCK(purge);
 990                                         //MM_FreeBlock(purge, mm);
 991                                         purge = next;           // purge another if not at scan
 992                                 }
 993                                 mm->mmrover = mm->mmnew;
 994                                 return; // good allocation!
 995                         }
 996
 997                         //
 998                         // if this block is purge level zero or locked, skip past it
 999                         //
1000                         if((scan->attributes & LOCKBIT)
1001                                 || !(scan->attributes & PURGEBITS) )
1002                         {
1003 printf("        [lock] ");      //0000
1004 printf("len=%lu ", scan->length);
1005                                 lastscan = scan;
1006                                 startseg = lastscan->start + (word)lastscan->length;
1007                         }
1008
1009 printf("\n");
1010                         scan=scan->next;                // look at next line
1011                 }
1012         }
1013
1014         if (mm->bombonerror)
1015         {
1016 #ifdef __WATCOMC__
1017                 heapdump();
1018 #endif
1019                 printf(OUT_OF_MEM_MSG,(size-mmi->nearheap));
1020                 printf("for stability reasons the program will shut down! wwww\n");
1021                 printf("                endid=%u\n",(mm->endid));
1022                 MM_Shutdown(mm);
1023                 exit(-1);
1024         }
1025         else
1026                 mm->mmerror = true;
1027 }
1028
1029 //==========================================================================
1030
1031 /*
1032 ====================
1033 =
1034 = MM_FreePtr
1035 =
1036 = Allocates an unlocked, unpurgable block
1037 =
1038 ====================
1039 */
1040
1041 void MM_FreePtr(memptr *baseptr, mminfo_t *mm)
1042 {
1043         mmblocktype huge *scan,huge *last;
1044
1045         last = mm->mmhead;
1046         scan = last->next;
1047
1048         if(baseptr == mm->mmrover->useptr)      // removed the last allocated block
1049                 mm->mmrover = mm->mmhead;
1050
1051         while(scan->useptr != baseptr && scan)
1052         {
1053                 last = scan;
1054                 scan = scan->next;
1055         }
1056
1057         if(!scan)
1058         {
1059                 printf("MM_FreePtr: Block not found!\n");
1060                 return;
1061         }
1062
1063         last->next = scan->next;
1064
1065         FREEBLOCK(scan);
1066         //MM_FreeBlock(scan, mm);
1067 }
1068 //==========================================================================
1069
1070 /*
1071 =====================
1072 =
1073 = MM_SetPurge
1074 =
1075 = Sets the purge level for a block (locked blocks cannot be made purgable)
1076 =
1077 =====================
1078 */
1079
1080 void MM_SetPurge(memptr *baseptr, int purge, mminfo_t *mm)
1081 {
1082         mmblocktype huge *start;
1083
1084         start = mm->mmrover;
1085
1086         do
1087         {
1088                 if(mm->mmrover->useptr == baseptr)
1089                         break;
1090
1091                 mm->mmrover = mm->mmrover->next;
1092
1093                 if(!mm->mmrover)
1094                         mm->mmrover = mm->mmhead;
1095                 else if(mm->mmrover == start)
1096                 {
1097                         printf("MM_SetPurge: Block not found!");
1098                         return;
1099                 }
1100
1101         } while(1);
1102
1103         mm->mmrover->attributes &= ~PURGEBITS;
1104         mm->mmrover->attributes |= purge;
1105 }
1106
1107 //==========================================================================
1108
1109 /*
1110 =====================
1111 =
1112 = MM_SetLock
1113 =
1114 = Locks / unlocks the block
1115 =
1116 =====================
1117 */
1118
1119 void MM_SetLock(memptr *baseptr, boolean locked, mminfo_t *mm)
1120 {
1121         mmblocktype huge *start;
1122
1123         start = mm->mmrover;
1124
1125         do
1126         {
1127                 if(mm->mmrover->useptr == baseptr)
1128                         break;
1129
1130                 mm->mmrover = mm->mmrover->next;
1131
1132                 if(!mm->mmrover)
1133                         mm->mmrover = mm->mmhead;
1134                 else if(mm->mmrover == start)
1135                 {
1136                         printf("MM_SetLock: Block not found!");
1137                         return;
1138                 }
1139
1140         } while(1);
1141
1142         mm->mmrover->attributes &= ~LOCKBIT;
1143         mm->mmrover->attributes |= locked*LOCKBIT;
1144 }
1145
1146 //==========================================================================
1147
1148 /*
1149 =====================
1150 =
1151 = MM_SortMem
1152 =
1153 = Throws out all purgable stuff and compresses movable blocks
1154 =
1155 =====================
1156 */
1157
1158 void MM_SortMem(mminfo_t *mm)
1159 {
1160         mmblocktype huge *scan,huge *last,huge *next;
1161         unsigned        start,length,source,dest,oldborder;
1162         int                     playing;
1163
1164         //
1165         // lock down a currently playing sound
1166         //
1167 /*++++  playing = SD_SoundPlaying ();
1168         if(playing)
1169         {
1170                 switch (SoundMode)
1171                 {
1172                 case sdm_PC:
1173                         playing += STARTPCSOUNDS;
1174                         break;
1175                 case sdm_AdLib:
1176                         playing += STARTADLIBSOUNDS;
1177                         break;
1178                 }
1179                 MM_SetLock(&(memptr)audiosegs[playing],true);
1180         }
1181
1182
1183         SD_StopSound();*/
1184 //      oldborder = bordercolor;
1185 //      VW_ColorBorder (15);
1186
1187         if(beforesort)
1188                 beforesort();
1189
1190         scan = mm->mmhead;
1191
1192         last = NULL;            // shut up compiler warning
1193
1194         while(scan)
1195         {
1196                 if(scan->attributes & LOCKBIT)
1197                 {
1198                 //
1199                 // block is locked, so try to pile later blocks right after it
1200                 //
1201                         start = scan->start + scan->length;
1202                 }
1203                 else
1204                 {
1205                         if(scan->attributes & PURGEBITS)
1206                         {
1207                         //
1208                         // throw out the purgable block
1209                         //
1210                                 next = scan->next;
1211                                 FREEBLOCK(scan);
1212                                 //MM_FreeBlock(scan, mm);
1213                                 last->next = next;
1214                                 scan = next;
1215                                 continue;
1216                         }
1217                         else
1218                         {
1219                         //
1220                         // push the non purgable block on top of the last moved block
1221                         //
1222                                 if(scan->start != start)
1223                                 {
1224                                         length = scan->length;
1225                                         source = scan->start;
1226                                         dest = start;
1227                                         while(length > 0xf00)
1228                                         {
1229                                                 movedata(source,0,dest,0,0xf00*16);
1230                                                 length -= 0xf00;
1231                                                 source += 0xf00;
1232                                                 dest += 0xf00;
1233                                         }
1234                                         movedata(source,0,dest,0,length*16);
1235
1236                                         scan->start = start;
1237                                         *(unsigned *)scan->useptr = start;
1238                                 }
1239                                 start = scan->start + scan->length;
1240                         }
1241                 }
1242
1243                 last = scan;
1244                 scan = scan->next;              // go to next block
1245         }
1246
1247         mm->mmrover = mm->mmhead;
1248
1249         if(aftersort)
1250                 aftersort();
1251
1252 //      VW_ColorBorder (oldborder);
1253
1254 /*++++  if(playing)
1255                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
1256 }
1257
1258
1259 //==========================================================================
1260
1261 //****#if 0
1262 /*
1263 =====================
1264 =
1265 = MM_ShowMemory
1266 =
1267 =====================
1268 */
1269
1270 void MM_ShowMemory(/*page_t *page, */mminfo_t *mm)
1271 {
1272         mmblocktype huge *scan;
1273 //++++  word color;
1274         word temp;
1275         long    end,owner;
1276 //++++  word chx,chy;
1277         byte    scratch[160],str[16];
1278
1279 //****  VW_SetDefaultColors();
1280 //****  VW_SetLineWidth(40);
1281 //++++mh        temp = bufferofs;
1282 //++++mh        bufferofs = 0;
1283 //****  VW_SetScreen (0,0);
1284
1285         scan = mm->mmhead;
1286
1287         end = -1;
1288
1289 CA_OpenDebug ();
1290
1291 //++++  chx=0;
1292 //++++  chy=0;
1293
1294         while(scan)
1295         {
1296 /*++++          if(scan->attributes & PURGEBITS)
1297                         color = 5;              // dark purple = purgable
1298                 else
1299                         color = 9;              // medium blue = non purgable
1300                 if(scan->attributes & LOCKBIT)
1301                         color = 12;             // red = locked*/
1302                 if(scan->start<=end)
1303                 {
1304                         //printf(");
1305                         write(debughandle,"\nMM_ShowMemory: Memory block order currupted!\n",strlen("\nMM_ShowMemory: Memory block order currupted!\n"));
1306                         //modexprint(&page, chx, chy, 1, 0, 24, "\nMM_ShowMemory: Memory block order currupted!\n");
1307                         return;
1308                 }
1309                 end = scan->start+scan->length-1;
1310 //++++          chy = scan->start/320;
1311 //++++          chx = scan->start%320;
1312                                 //modexhlin(page, scan->start, (unsigned)end, chy, color);
1313                                 //for(chx=scan->start;chx+4>=(word)end;chx+=4)
1314                                 //{
1315 //++++                                  modexClearRegion(page, chx, chy, 4, 4, color);
1316                                 //}
1317
1318 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1319
1320 //++++          VW_Plot(scan->start,0,15);
1321 //++++                          modexClearRegion(page, chx, chy, 4, 4, 15);
1322                 if(scan->next->start > end+1)
1323 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1324                         //for(chx=scan->next->start;chx+4>=(word)end+1;chx+=4)
1325                         //{
1326 //++++                          chx+=scan->next->start;
1327 //++++                          modexClearRegion(page, chx, chy, 4, 4, 2);
1328                         //}
1329                                         //modexhlin(page, end+1,scan->next->start, chy, 0);
1330
1331 /*
1332                 end = scan->length-1;
1333                 y = scan->start/320;
1334                 x = scan->start%320;
1335                 VW_Hlin(x,x+end,y,color);
1336                 VW_Plot(x,y,15);
1337                 if (scan->next && scan->next->start > end+1)
1338                         VW_Hlin(x+end+1,x+(scan->next->start-scan->start),y,0); // black = free
1339 */
1340
1341 //****#if 0
1342 //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!
1343 strcpy(scratch,"Seg:");
1344 ultoa (scan->start,str,16);
1345 strcat (scratch,str);
1346 strcat (scratch,"\tSize:");
1347 ultoa ((dword)scan->length,str,10);
1348 strcat (scratch,str);
1349 strcat (scratch,"\tOwner:0x");
1350 owner = (unsigned)scan->useptr;
1351 ultoa (owner,str,16);
1352 strcat (scratch,str);
1353 strcat (scratch,"\n");
1354 write(debughandle,scratch,strlen(scratch));
1355 //modexprint(page, chx, chy, 1, 0, 24, &scratch);
1356 //++++chy+=4;
1357 //fprintf(stdout, "%s", scratch);
1358 //****#endif
1359
1360                 scan = scan->next;
1361         }
1362
1363 CA_CloseDebug ();
1364
1365 //++++mh        IN_Ack();
1366 //****  VW_SetLineWidth(64);
1367 //++++mh        bufferofs = temp;
1368 }
1369 //****#endif
1370
1371 //==========================================================================
1372
1373 /*
1374 =====================
1375 =
1376 = MM_DumpData
1377 =
1378 =====================
1379 */
1380
1381 void MM_DumpData(mminfo_t *mm)
1382 {
1383         mmblocktype huge *scan,huge *best;
1384         long    lowest,oldlowest;
1385         word    owner;
1386         byte    lock,purge;
1387         FILE    *dumpfile;
1388
1389
1390         //++++free(mm->nearheap);
1391         dumpfile = fopen ("mmdump.16","w");
1392         if (!dumpfile){
1393                 printf("MM_DumpData: Couldn't open MMDUMP.16!\n");
1394                 return;
1395         }
1396
1397         lowest = -1;
1398         do
1399         {
1400                 oldlowest = lowest;
1401                 lowest = 0xffff;
1402
1403                 scan = mm->mmhead;
1404                 while (scan)
1405                 {
1406                         owner = (word)scan->useptr;
1407
1408                         if (owner && owner<lowest && owner > oldlowest)
1409                         {
1410                                 best = scan;
1411                                 lowest = owner;
1412                         }
1413
1414                         scan = scan->next;
1415                 }
1416
1417                 if (lowest != 0xffff)
1418                 {
1419                         if (best->attributes & PURGEBITS)
1420                                 purge = 'P';
1421                         else
1422                                 purge = '-';
1423                         if (best->attributes & LOCKBIT)
1424                                 lock = 'L';
1425                         else
1426                                 lock = '-';
1427                         fprintf (dumpfile,"0x%p (%c%c) = %u\n"
1428                         ,(word)lowest,lock,purge,best->length);
1429                 }
1430
1431         } while (lowest != 0xffff);
1432
1433         fclose(dumpfile);
1434         printf("MMDUMP.16 created.\n");
1435 }
1436
1437 //==========================================================================
1438
1439
1440 /*
1441 ======================
1442 =
1443 = MM_UnusedMemory
1444 =
1445 = Returns the total free space without purging
1446 =
1447 ======================
1448 */
1449
1450 dword MM_UnusedMemory(mminfo_t *mm)
1451 {
1452         dword free;
1453         mmblocktype huge *scan;
1454
1455         free = 0;
1456         scan = mm->mmhead;
1457
1458         while(scan->next)
1459         {
1460                 free += scan->next->start - (scan->start + scan->length);
1461                 scan = scan->next;
1462         }
1463
1464 //      return free*16l;
1465         return free;
1466 }
1467
1468 //==========================================================================
1469
1470
1471 /*
1472 ======================
1473 =
1474 = MM_TotalFree
1475 =
1476 = Returns the total free space with purging
1477 =
1478 ======================
1479 */
1480
1481 dword MM_TotalFree(mminfo_t *mm)
1482 {
1483         dword free;
1484         mmblocktype huge *scan;
1485
1486         free = 0;
1487         scan = mm->mmhead;
1488
1489         while(scan->next)
1490         {
1491                 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1492                         free += scan->length;
1493                 free += scan->next->start - (scan->start + scan->length);
1494                 scan = scan->next;
1495         }
1496
1497 //      return free*16l;
1498         return free;
1499 }
1500
1501 //==========================================================================
1502
1503 /*
1504 =====================
1505 =
1506 = MM_Report
1507 =
1508 =====================
1509 */
1510
1511 void MM_Report(/*page_t *page, */mminfo_t *mm, mminfotype *mmi)
1512 {
1513         if(MML_CheckForEMS())
1514         {
1515                 printf("EMM v%x.%x available\n", mm->EMSVer>>4,mm->EMSVer&0x0F);
1516                 printf("totalEMSpages=%u\n", mm->totalEMSpages);
1517                 printf("freeEMSpages=%u\n", mm->freeEMSpages);
1518                 printf("EMSpageframe=%x\n", mm->EMSpageframe);
1519         }
1520         if(MML_CheckForXMS(mm)) printf("XMSaddr=%X\n", *XMSaddr);
1521         printf("near=%lu\n", mmi->nearheap);
1522         printf("far=%lu\n", mmi->farheap);
1523         printf("EMSmem=%lu\n", mmi->EMSmem);
1524         printf("XMSmem=%lu\n", mmi->XMSmem);
1525         printf("mainmem=%lu\n", mmi->mainmem);
1526         printf("UnusedMemory=%lu\n", MM_UnusedMemory(mm));
1527         printf("TotalFree=%lu\n", MM_TotalFree(mm));
1528         //mmi->nearheap+mmi->farheap+
1529         printf("TotalUsed=%lu\n", mmi->mainmem+mmi->EMSmem+mmi->XMSmem);//+);
1530 //      printf("\n");
1531 //      printf("UnusedMemory=%lu kb\n", MM_UnusedMemory()/10248);
1532 //      printf("TotalFree=%lu kb\n", MM_TotalFree()/10248);
1533 }
1534
1535 //==========================================================================
1536
1537 /*
1538 =====================
1539 =
1540 = MM_EMSerr
1541 =
1542 =====================
1543 */
1544
1545 void MM_EMSerr(byte *stri, byte err)
1546 {
1547         //Returns a text string describing the error code in EMS.Error.
1548         switch(err)
1549         {
1550                 case 0x0:
1551                         strcat(stri, "successful");
1552                 break;
1553                 case 0x80:
1554                         strcat(stri, "internal error");
1555                 break;
1556                 case 0x81:
1557                         strcat(stri, "hardware malfunction");
1558                 break;
1559                 case 0x82:
1560                         strcat(stri, "busy .. retry later");
1561                 break;
1562                 case 0x83:
1563                         strcat(stri, "invalid handle");
1564                 break;
1565                 case 0x84:
1566                         strcat(stri, "undefined function requested by application");
1567                 break;
1568                 case 0x85:
1569                         strcat(stri, "no more handles available");
1570                 break;
1571                 case 0x86:
1572                         strcat(stri, "error in save or restore of mapping context");
1573                 break;
1574                 case 0x87:
1575                         strcat(stri, "insufficient memory pages in system");
1576                 break;
1577                 case 0x88:
1578                         strcat(stri, "insufficient memory pages available");
1579                 break;
1580                 case 0x89:
1581                         strcat(stri, "zero pages requested");
1582                 break;
1583                 case 0x8A:
1584                         strcat(stri, "invalid logical page number encountered");
1585                 break;
1586                 case 0x8B:
1587                         strcat(stri, "invalid physical page number encountered");
1588                 break;
1589                 case 0x8C:
1590                         strcat(stri, "page-mapping hardware state save area is full");
1591                 break;
1592                 case 0x8D:
1593                         strcat(stri, "save of mapping context failed");
1594                 break;
1595                 case 0x8E:
1596                         strcat(stri, "restore of mapping context failed");
1597                 break;
1598                 case 0x8F:
1599                         strcat(stri, "undefined subfunction");
1600                 break;
1601                 case 0x90:
1602                         strcat(stri, "undefined attribute type");
1603                 break;
1604                 case 0x91:
1605                         strcat(stri, "feature not supported");
1606                 break;
1607                 case 0x92:
1608                         strcat(stri, "successful, but a portion of the source region has been overwritten");
1609                 break;
1610                 case 0x93:
1611                         strcat(stri, "length of source or destination region exceeds length of region allocated to either source or destination handle");
1612                 break;
1613                 case 0x94:
1614                         strcat(stri, "conventional and expanded memory regions overlap");
1615                 break;
1616                 case 0x95:
1617                         strcat(stri, "offset within logical page exceeds size of logical page");
1618                 break;
1619                 case 0x96:
1620                         strcat(stri, "region length exceeds 1 MB");
1621                 break;
1622                 case 0x97:
1623                         strcat(stri, "source and destination EMS regions have same handle and overlap");
1624                 break;
1625                 case 0x98:
1626                         strcat(stri, "memory source or destination type undefined");
1627                 break;
1628                 case 0x9A:
1629                         strcat(stri, "specified alternate map register or DMA register set not supported");
1630                 break;
1631                 case 0x9B:
1632                         strcat(stri, "all alternate map register or DMA register sets currently allocated");
1633                 break;
1634                 case 0x9C:
1635                         strcat(stri, "alternate map register or DMA register sets not supported");
1636                 break;
1637                 case 0x9D:
1638                         strcat(stri, "undefined or unallocated alternate map register or DMA register set");
1639                 break;
1640                 case 0x9E:
1641                         strcat(stri, "dedicated DMA channels not supported");
1642                 break;
1643                 case 0x9F:
1644                         strcat(stri, "specified dedicated DMA channel not supported");
1645                 break;
1646                 case 0xA0:
1647                         strcat(stri, "no such handle name");
1648                 break;
1649                 case 0xA1:
1650                         strcat(stri, "a handle found had no name, or duplicate handle name");
1651                 break;
1652                 case 0xA2:
1653                         strcat(stri, "attempted to wrap around 1M conventional address space");
1654                 break;
1655                 case 0xA3:
1656                         strcat(stri, "source array corrupted");
1657                 break;
1658                 case 0xA4:
1659                         strcat(stri, "operating system denied access");
1660                 break;
1661                 default:
1662                         strcat(stri, "undefined error");
1663         }
1664 }
1665
1666 //==========================================================================
1667
1668 /*
1669 =====================
1670 =
1671 = MM_BombOnError
1672 =
1673 =====================
1674 */
1675
1676 void MM_BombOnError(boolean bomb, mminfo_t *mm)
1677 {
1678         mm->bombonerror = bomb;
1679 }
1680
1681 /*void MM_GetNewBlock(mminfo_t *mm)
1682 {
1683         if(!mm->mmfree)
1684                 MML_ClearBlock(mm);
1685         mm->mmnew=mm->mmfree;
1686         mm->mmfree=mm->mmfree->next;
1687         if(!(mm->mmnew=mm->mmfree))
1688         {
1689                 printf("MM_GETNEWBLOCK: No free blocks!\n");
1690                 return;
1691         }
1692         mm->mmfree=mm->mmfree->next;
1693         mm->endid++;    //end of list
1694 }
1695
1696 void MM_FreeBlock(mmblocktype *x, mminfo_t *mm)
1697 {
1698         x->useptr=NULL;
1699         x->next=mm->mmfree;
1700         mm->mmfree=x;
1701         mm->endid--;    //end of list
1702 }*/
1703
1704 void MM_seguin(void)
1705 {
1706         __asm {
1707                 push    ds
1708                 mov     ax,ds
1709                 inc             ax
1710                 mov     ds,ax
1711         }
1712 }
1713
1714 void MM_segude(void)
1715 {
1716         __asm {
1717                 pop ds
1718         }
1719 }
1720
1721 /*
1722 pull data from far and put it into ds var
1723 mov ax,es:si
1724 mov x,ax
1725 */
1726 /*
1727 ss stack segment
1728 sp top of stack
1729 bp bottem of stack
1730 */