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 #include "src/lib/16_ca.h"
  51 #pragma hdrstop
  52
  53 #pragma warn -pro
  54 #pragma warn -use
  55
  56 /*
  57 =============================================================================
  58
  59                                                  GLOBAL VARIABLES
  60
  61 =============================================================================
  62 */
  63
  64 void            (* beforesort) (void);
  65 void            (* aftersort) (void);
  66 void            (* XMSaddr) (void);             // far pointer to XMS driver
  67
  68 /*
  69 =============================================================================
  70
  71                                                  LOCAL VARIABLES
  72
  73 =============================================================================
  74 */
  75
  76 static  char *ParmStringsexmm[] = {"noems","noxms",""};
  77
  78 /*
  79 ======================
  80 =
  81 = MML_CheckForEMS
  82 =
  83 = Routine from p36 of Extending DOS
  84 =
  85 =======================
  86 */
  87
  88 boolean MML_CheckForEMS(void)
  89 {
  90         boolean emmcfems;
  91         static char     emmname[] = "EMMXXXX0"; //fix by andrius4669
  92 //              mov     dx,OFFSET emmname
  93         __asm {
  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                 strcpy(str,"MM_SetupEMS: EMS error ");
 245                 MM_EMSerr(str, err);
 246                 printf("%s\n",str);
 247                 return err;
 248         }
 249         mm->totalEMSpages=totalEMSpages;
 250         mm->freeEMSpages=freeEMSpages;
 251         mm->EMSpageframe=EMSpageframe;
 252         mm->EMSpagesmapped=EMSpagesmapped;
 253         mm->EMShandle=EMShandle;
 254         mm->EMSVer=EMSVer;
 255         return 0;
 256 }
 257
 258
 259 /*
 260 ======================
 261 =
 262 = MML_ShutdownEMS
 263 =
 264 =======================
 265 */
 266
 267 void MML_ShutdownEMS(mminfo_t *mm)
 268 {
 269         boolean errorflag=false;
 270         unsigned EMShandle=mm->EMShandle;
 271
 272         if(!EMShandle)
 273                 return;
 274         __asm {
 275                 mov     ah,EMS_FREEPAGES
 276                 mov     dx,[EMShandle]
 277                 int     EMS_INT
 278                 or      ah,ah
 279                 jz      ok
 280                 mov     errorflag,1
 281 #ifdef __BORLANDC__
 282         }
 283 #endif
 284                 ok:
 285 #ifdef __WATCOMC__
 286         }
 287 #endif
 288         if(errorflag==true) printf("MML_ShutdownEMS: Error freeing EMS!\n");    //++++ add something
 289 }
 290
 291 /*
 292 ====================
 293 =
 294 = MM_MapEMS
 295 =
 296 = Maps the 64k of EMS used by memory manager into the page frame
 297 = for general use.  This only needs to be called if you are keeping
 298 = other things in EMS.
 299 =
 300 ====================
 301 */
 302
 303 byte MM_MapEMS(mminfo_t *mm, mminfotype *mmi)
 304 {
 305         byte    str[160];
 306         unsigned        EMShandle;
 307         byte err;
 308         boolean errorflag=false;
 309         int     i;
 310         EMShandle=mm->EMShandle;
 311
 312         for (i=0;i<4/*MAPPAGES*/;i++)
 313         {
 314                 __asm {
 315                         mov     ah,EMS_MAPPAGE
 316                         mov     bx,[i]                  // logical page
 317                         mov     al,bl                   // physical page
 318                         mov     dx,[EMShandle]  // handle
 319                         int     EMS_INT
 320                         or      ah,ah
 321                         jnz     error
 322                         jmp End
 323 #ifdef __BORLANDC__
 324                 }
 325 #endif
 326                         error:
 327 #ifdef __BORLANDC__
 328                 __asm {
 329 #endif
 330                         mov     err,ah
 331                         mov     errorflag,1
 332 #ifdef __BORLANDC__
 333                 }
 334 #endif
 335                         End:
 336 #ifdef __WATCOMC__
 337                 }
 338 #endif
 339                 if(errorflag==true)
 340                 {
 341                         strcpy(str,"MM_MapEMS: EMS error ");
 342                         MM_EMSerr(str, err);
 343                         printf("%s\n",str);
 344                         return err;
 345                 }
 346         }
 347         mmi->EMSmem = (i)*0x4000lu;
 348         //printf("              mmi->EMSmem=%lu\n", mmi->EMSmem);
 349         return 0;
 350 }
 351
 352 byte MM_MapXEMS(mminfo_t *mm, mminfotype *mmi)
 353 {
 354 //SUB EMS.MapXPages (PhysicalStart, LogicalStart, NumPages, Handle)
 355
 356         //Maps up to 4 logical EMS pages to physical pages in the page frame, where:
 357         //PhysicalStart = Physical page first logical page is mapped to
 358         //LogicalStart  = First logical page to map
 359         //NumPages      = Number of pages to map (1 to 4)
 360         //Handle        = EMS handle logical pages are allocated to
 361
 362   /*//Create a buffer containing the page information
 363 //  FOR x = 0 TO NumPages - 1
 364 //    MapInfo$ = MapInfo$ + MKI$(LogicalStart + x) + MKI$(PhysicalStart + x)
 365 //  NEXT*/
 366
 367 //  Regs.ax = 0x5000                           //Map the pages in the buffer
 368 //  Regs.cx = NumPages                         //to the pageframe
 369 //  Regs.dx = Handle
 370 //  Regs.ds = VARSEG(MapInfo$)
 371 //  Regs.si = SADD(MapInfo$)
 372 //  InterruptX 0x67, Regs, Regs
 373 //      EMS.Error = (Regs.ax AND 0xFF00&) \ 0x100  //Store the status code
 374
 375 //END SUB
 376         byte    str[160];
 377         byte err;
 378         word    EMShandle;
 379         boolean errorflag=false;
 380         int     i;
 381         EMShandle=mm->EMShandle;
 382
 383         if(mm->EMSVer<0x40)
 384                 return 5;
 385
 386         for (i=0;i<MAPPAGES;i++)
 387         {
 388                 __asm {
 389                         mov     ah,EMS_MAPXPAGE
 390                         mov     cx,[i]                  // logical page
 391                         mov     al,bl                   // physical page
 392                         mov     dx,[EMShandle]  // handle
 393                         int     EMS_INT
 394                         or      ah,ah
 395                         jnz     error
 396                         jmp End
 397 #ifdef __BORLANDC__
 398                 }
 399 #endif
 400                         error:
 401 #ifdef __BORLANDC__
 402                 __asm {
 403 #endif
 404                         mov     err,ah
 405                         mov     errorflag,1
 406 #ifdef __BORLANDC__
 407                 }
 408 #endif
 409                         End:
 410 #ifdef __WATCOMC__
 411                 }
 412 #endif
 413                 if(errorflag==true)
 414                 {
 415                         //strcpy(str,"MM_MapXEMS: EMS error 0x");
 416                         strcpy(str,"MM_MapXEMS: EMS error ");
 417                         //itoa(err,str2,16);
 418                         MM_EMSerr(str, err);
 419                         printf("%s\n",str);
 420                         //printf("%s%x\n",str, err);
 421                         //printf("FACK! %x\n", err);
 422                         return err;
 423                 }
 424         }
 425         mmi->EMSmem = (i)*0x4000lu;
 426         return 0;
 427 }
 428
 429 //==========================================================================
 430
 431 /*
 432 ======================
 433 =
 434 = MML_CheckForXMS
 435 =
 436 = Check for XMM driver
 437 =
 438 =======================
 439 */
 440
 441 boolean MML_CheckForXMS(mminfo_t *mm)
 442 {
 443         boolean errorflag=false;
 444         mm->numUMBs = 0;
 445
 446         __asm {
 447                 mov     ax,0x4300
 448                 int     0x2f                            // query status of installed diver
 449                 cmp     al,0x80
 450                 je      good
 451                 mov     errorflag,1
 452 #ifdef __BORLANDC__
 453         }
 454 #endif
 455                 good:
 456 #ifdef __WATCOMC__
 457         }
 458 #endif
 459         if(errorflag==true) return false;
 460         else return true;
 461 }
 462
 463
 464 /*
 465 ======================
 466 =
 467 = MML_SetupXMS
 468 =
 469 = Try to allocate all upper memory block
 470 =
 471 =======================
 472 */
 473
 474 void MML_SetupXMS(mminfo_t *mm, mminfotype *mmi)
 475 {
 476         word    base,size;
 477
 478 getmemory:
 479         __asm {
 480                 mov     ax,0x4310
 481                 int     0x2f
 482                 mov     [WORD PTR XMSaddr],bx
 483                 mov     [WORD PTR XMSaddr+2],es         // function pointer to XMS driver
 484
 485                 mov     ah,XMS_ALLOCUMB
 486                 mov     dx,0xffff                                       // try for largest block possible
 487                 //mov     ax,dx                                         // Set available Kbytes.
 488                 call    [DWORD PTR XMSaddr]
 489                 or      ax,ax
 490                 jnz     gotone
 491
 492                 cmp     bl,0xb0                                         // error: smaller UMB is available
 493                 jne     done;
 494
 495                 mov     ah,XMS_ALLOCUMB
 496                 call    [DWORD PTR XMSaddr]             // DX holds largest available UMB
 497                 or      ax,ax
 498                 jz      done                                            // another error...
 499 #ifdef __BORLANDC__
 500         }
 501 #endif
 502                 gotone:
 503 #ifdef __BORLANDC__
 504         __asm {
 505 #endif
 506                 mov     [base],bx
 507                 mov     [size],dx
 508 #ifdef __BORLANDC__
 509         }
 510 #endif
 511                 done:
 512 #ifdef __WATCOMC__
 513         }
 514 #endif
 515 //      printf("base=%u ", base); printf("size=%u\n", size);
 516         MML_UseSpace(base,size, mm);
 517         mmi->XMSmem += size*16;
 518         mm->UMBbase[mm->numUMBs] = base;
 519         mm->numUMBs++;
 520         if(mm->numUMBs < MAXUMBS)
 521                 goto getmemory;
 522 }
 523
 524
 525 /*
 526 ======================
 527 =
 528 = MML_ShutdownXMS
 529 =
 530 ======================
 531 */
 532
 533 void MML_ShutdownXMS(mminfo_t *mm)
 534 {
 535         int     i;
 536         unsigned        base;
 537
 538         for (i=0;i<mm->numUMBs;i++)
 539         {
 540                 base = mm->UMBbase[i];
 541                 __asm {
 542                         mov     ah,XMS_FREEUMB
 543                         mov     dx,[base]
 544                         call    [DWORD PTR XMSaddr]
 545                 }
 546         }
 547 }
 548
 549 //==========================================================================
 550
 551 /*
 552 ======================
 553 =
 554 = MML_UseSpace
 555 =
 556 = Marks a range of paragraphs as usable by the memory manager
 557 = This is used to mark space for the near heap, far heap, ems page frame,
 558 = and upper memory blocks
 559 =
 560 ======================
 561 */
 562
 563 void MML_UseSpace(word segstart, dword seglength, mminfo_t *mm)
 564 {
 565         mmblocktype huge *scan,huge *last;
 566         word            segm=1;
 567         word    oldend;
 568         dword           segmlen;
 569         dword           extra;
 570
 571         scan = last = mm->mmhead;
 572         mm->mmrover = mm->mmhead;               // reset rover to start of memory
 573
 574 //
 575 // search for the block that contains the range of segments
 576 //
 577         while(scan->start+scan->length < segstart)
 578         {
 579                 last = scan;
 580                 scan = scan->next;
 581         }
 582
 583 //
 584 // take the given range out of the block
 585 //
 586         oldend = scan->start + scan->length;
 587         extra = oldend - (segstart+seglength);
 588
 589         segmlen=extra;
 590 //
 591 // find out how many blocks it spans!
 592 //
 593         for(;segmlen>0x10000;segmlen-=0x10000)
 594         {
 595                 //printf("      seglen=%lu\n", segmlen);
 596                 segm++;
 597         }
 598
 599         //++++emsver stuff!
 600         if(segm>1/* || extra>=0x10000lu*/)
 601         //if(extra>0xfffflu)
 602         {
 603                 scan->blob=segm;
 604                 /*__asm
 605                 {
 606                         push    ds
 607                         mov     ax,ds
 608                         inc             ax
 609                         mov     ds,ax
 610                 }*/
 611
 612
 613                 //MML_UseSpace(segstart, seglength, mm);
 614
 615                 /*__asm
 616                 {
 617                         pop ds
 618                 }*/
 619                 printf("MML_UseSpace: Segment spans two blocks!\n");
 620         //}
 621         printf("========================================\n");
 622         printf("segm=%u         ", segm);
 623         printf("ex=%lu  ", extra);
 624         printf("old=%u  ", oldend);
 625         printf("start+seglen=%lu\n", segstart+seglength);
 626         printf("segsta=%x       ", segstart);
 627         printf("len=%lu ", scan->length);
 628         printf("seglen=%lu      ", seglength);
 629         printf("segmlen=%lu\n", segmlen);
 630         printf("========================================\n");
 631         }
 632 //++++todo: linked list of segment!
 633         if(segstart == scan->start)
 634         {
 635                 last->next = scan->next;                        // unlink block
 636                 FREEBLOCK(scan);
 637                 scan = last;
 638         }
 639         else
 640                 scan->length = segstart-scan->start;    // shorten block
 641
 642         if(extra > 0)
 643         {
 644                 GETNEWBLOCK;
 645                 mm->mmnew->useptr = NULL;
 646
 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
 715 //
 716 // set up the linked list (everything in the free list;
 717 //
 718         mm->mmhead = NULL;
 719         mm->mmfree = &(mm->mmblocks[0]);
 720         for(i=0;i<MAXBLOCKS-1;i++)
 721         {
 722                 mm->mmblocks[i].next = &(mm->mmblocks[i+1]);
 723         }
 724         mm->mmblocks[i].next = NULL;
 725
 726 //
 727 // locked block of all memory until we punch out free space
 728 //
 729         GETNEWBLOCK;
 730         mm->mmhead = mm->mmnew;                         // this will allways be the first node
 731         mm->mmnew->start = 0;
 732         mm->mmnew->length = 0xffff;
 733         mm->mmnew->attributes = LOCKBIT;
 734         mm->mmnew->next = NULL;
 735         mm->mmrover = mm->mmhead;
 736
 737 //
 738 // get all available near conventional memory segments
 739 //
 740 #ifdef __WATCOMC__
 741         _nheapgrow();
 742         length=(dword)_memavl();//(dword)GetFreeSize();
 743         start = (void huge *)(mm->nearheap = _nmalloc(length));
 744 #endif
 745 #ifdef __BORLANDC__
 746         length=coreleft();
 747         start = (void huge *)(mm->nearheap = malloc(length));
 748 #endif
 749         length -= 16-(FP_OFF(start)&15);
 750         length -= SAVENEARHEAP;
 751         seglength = length / 16;                        // now in paragraphs
 752         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 753         MML_UseSpace(segstart,seglength, mm);
 754         mmi->nearheap = length;
 755         //printf("start=%Fp     segstart=%x     seglen=%lu      len=%lu\n", start, segstart, seglength, length);
 756
 757 //
 758 // get all available far conventional memory segments
 759 //
 760         //printf("_FARCORELEFT                          %lu\n", _FCORELEFT);
 761 #ifdef __WATCOMC__
 762         _fheapgrow();
 763 #endif
 764 #ifdef __BORLANDC__
 765         printf("farcoreleft()                           %lu\n", farcoreleft());
 766         printf("(farcoreleft()+32)-_FCORELEFT   %d\n", (sword)((farcoreleft()+32)-_FCORELEFT));
 767 #endif
 768         length=_FCORELEFT;//_fcoreleft();//(dword)GetFarFreeSize();//0xffffUL*4UL;
 769         start = mm->farheap = _fmalloc(length);
 770         //start = mm->farheap = halloc(length, 1);
 771         length -= 16-(FP_OFF(start)&15);
 772         length -= SAVEFARHEAP;
 773         seglength = length / 16;                        // now in paragraphs
 774         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 775         MML_UseSpace(segstart,seglength, mm);
 776         mmi->farheap = length;
 777         //printf("start=%Fp     segstart=%x     seglen=%lu      len=%lu\n", start, segstart, seglength, length);
 778
 779         mmi->mainmem = mmi->nearheap + mmi->farheap;
 780
 781 //
 782 // detect EMS and allocate up to 64K at page frame
 783 //
 784         mmi->EMSmem = 0;
 785 //goto emsskip; //0000
 786         for(i = 1;i <
 787 #ifdef __WATCOMC__
 788         __argc
 789 #endif
 790 #ifdef __BORLANDC__
 791         _argc
 792 #endif
 793         ;i++)
 794         {
 795                 if(US_CheckParm(
 796 #ifdef __WATCOMC__
 797         __argv[i]
 798 #endif
 799 #ifdef __BORLANDC__
 800         _argv[i]
 801 #endif
 802                         ,ParmStringsexmm) == 0)
 803                         goto emsskip;                           // param NOEMS
 804         }
 805         if(MML_CheckForEMS())
 806         {
 807                 MML_SetupEMS(mm);                                       // allocate space
 808                 //TODO: EMS4! AND EMS 3.2 MASSIVE DATA HANDLMENT!
 809                 MML_UseSpace(mm->EMSpageframe,(MAPPAGES)*0x4000lu, mm);
 810                 //if(mm->EMSVer<0x40)
 811                         MM_MapEMS(mm, mmi);                                     // map in used pages
 812                 //else
 813                         //MM_MapXEMS(mm, mmi);                                  // map in used pages
 814         }
 815
 816 //
 817 // detect XMS and get upper memory blocks
 818 //
 819 emsskip:
 820         mmi->XMSmem = 0;
 821 goto xmsskip;//0000
 822         for(i = 1;i <
 823 #ifdef __WATCOMC__
 824         __argc
 825 #endif
 826 #ifdef __BORLANDC__
 827         _argc
 828 #endif
 829         ;i++)
 830         {
 831                 if(US_CheckParm(
 832 #ifdef __WATCOMC__
 833         __argv[i]
 834 #endif
 835 #ifdef __BORLANDC__
 836         _argv[i]
 837 #endif
 838                         ,ParmStringsexmm) == 0)
 839                         goto xmsskip;                           // param NOXMS
 840         }
 841         if(MML_CheckForXMS(mm))
 842         {
 843                 MML_SetupXMS(mm, mmi);                                  // allocate as many UMBs as possible
 844         }
 845
 846 //
 847 // allocate the misc buffer
 848 //
 849 xmsskip:
 850         mm->mmrover = mm->mmhead;               // start looking for space after low block
 851
 852         MM_GetPtr(&(mm->bufferseg),BUFFERSIZE, mm, mmi);
 853 }
 854
 855 //==========================================================================
 856
 857 /*
 858 ====================
 859 =
 860 = MM_Shutdown
 861 =
 862 = Frees all conventional, EMS, and XMS allocated
 863 =
 864 ====================
 865 */
 866
 867 void MM_Shutdown(mminfo_t *mm)
 868 {
 869         if(!(mm->mmstarted))
 870                 return;
 871
 872         _ffree(mm->farheap);//  printf("                far freed\n");
 873 #ifdef __WATCOMC__
 874         _nfree(mm->nearheap);// printf("                near freed\n");
 875 #endif
 876 #ifdef __BORLANDC__
 877         free(mm->nearheap);//   printf("                near freed\n");
 878 #endif
 879         if(MML_CheckForEMS()){ MML_ShutdownEMS(mm); }//printf("         EMS freed\n"); }
 880         if(MML_CheckForXMS(mm)){ MML_ShutdownXMS(mm); }//printf("               XMS freed\n"); }
 881 }
 882
 883 //==========================================================================
 884
 885 /*
 886 ====================
 887 =
 888 = MM_GetPtr
 889 =
 890 = Allocates an unlocked, unpurgable block
 891 =
 892 ====================
 893 */
 894
 895 void MM_GetPtr (memptr *baseptr, dword size, mminfo_t *mm, mminfotype *mmi)
 896 {
 897         mmblocktype huge *scan,huge *lastscan,huge *endscan
 898                                 ,huge *purge,huge *next;
 899         int                     search;
 900         unsigned        needed,startseg;
 901
 902         needed = (size+15)/16;          // convert size from bytes to paragraphs
 903
 904         GETNEWBLOCK;                            // fill in start and next after a spot is found
 905         mm->mmnew->length = needed;
 906         mm->mmnew->useptr = baseptr;
 907         mm->mmnew->attributes = BASEATTRIBUTES;
 908
 909 //tryagain:
 910         for (search = 0; search<3; search++)
 911         {
 912         //
 913         // first search:        try to allocate right after the rover, then on up
 914         // second search:       search from the head pointer up to the rover
 915         // third search:        compress memory, then scan from start
 916                 if (search == 1 && mm->mmrover == mm->mmhead)
 917                         search++;
 918
 919                 switch (search)
 920                 {
 921                 case 0:
 922                         lastscan = mm->mmrover;
 923                         scan = mm->mmrover->next;
 924                         endscan = NULL;
 925                         break;
 926                 case 1:
 927                         lastscan = mm->mmhead;
 928                         scan = mm->mmhead->next;
 929                         endscan = mm->mmrover;
 930                         break;
 931                 case 2:
 932                         MM_SortMem (mm);
 933                         lastscan = mm->mmhead;
 934                         scan = mm->mmhead->next;
 935                         endscan = NULL;
 936                         break;
 937                 }
 938
 939                 startseg = lastscan->start + lastscan->length;
 940
 941                 while (scan != endscan)
 942                 {
 943                         if (scan->start - startseg >= needed)
 944                         {
 945                         //
 946                         // got enough space between the end of lastscan and
 947                         // the start of scan, so throw out anything in the middle
 948                         // and allocate the new block
 949                         //
 950                                 purge = lastscan->next;
 951                                 lastscan->next = mm->mmnew;
 952                                 mm->mmnew->start = *(unsigned *)baseptr = startseg;
 953                                 mm->mmnew->next = scan;
 954                                 while ( purge != scan)
 955                                 {       // free the purgable block
 956                                         next = purge->next;
 957                                         FREEBLOCK(purge);
 958                                         purge = next;           // purge another if not at scan
 959                                 }
 960                                 mm->mmrover = mm->mmnew;
 961                                 return; // good allocation!
 962                         }
 963
 964                         //
 965                         // if this block is purge level zero or locked, skip past it
 966                         //
 967                         if ( (scan->attributes & LOCKBIT)
 968                                 || !(scan->attributes & PURGEBITS) )
 969                         {
 970                                 lastscan = scan;
 971                                 startseg = lastscan->start + lastscan->length;
 972                         }
 973
 974
 975                         scan=scan->next;                // look at next line
 976                 }
 977         }
 978
 979         if (mm->bombonerror)
 980         {
 981 #ifdef __WATCOMC__
 982                 //heapdump();
 983 #endif
 984                 printf(OUT_OF_MEM_MSG,(size-mmi->nearheap));
 985                 printf("for stability reasons the program will shut down! wwww\n");
 986                 MM_Shutdown(mm);
 987                 exit(-1);
 988         }
 989         else
 990                 mm->mmerror = true;
 991 }
 992
 993 //==========================================================================
 994
 995 /*
 996 ====================
 997 =
 998 = MM_FreePtr
 999 =
1000 = Allocates an unlocked, unpurgable block
1001 =
1002 ====================
1003 */
1004
1005 void MM_FreePtr(memptr *baseptr, mminfo_t *mm)
1006 {
1007         mmblocktype huge *scan,huge *last;
1008
1009         last = mm->mmhead;
1010         scan = last->next;
1011
1012         if(baseptr == mm->mmrover->useptr)      // removed the last allocated block
1013                 mm->mmrover = mm->mmhead;
1014
1015         while(scan->useptr != baseptr && scan)
1016         {
1017                 last = scan;
1018                 scan = scan->next;
1019         }
1020
1021         if(!scan)
1022         {
1023                 printf("MM_FreePtr: Block not found!\n");
1024                 return;
1025         }
1026
1027         last->next = scan->next;
1028
1029         FREEBLOCK(scan);
1030 }
1031 //==========================================================================
1032
1033 /*
1034 =====================
1035 =
1036 = MM_SetPurge
1037 =
1038 = Sets the purge level for a block (locked blocks cannot be made purgable)
1039 =
1040 =====================
1041 */
1042
1043 void MM_SetPurge(memptr *baseptr, int purge, mminfo_t *mm)
1044 {
1045         mmblocktype huge *start;
1046
1047         start = mm->mmrover;
1048
1049         do
1050         {
1051                 if(mm->mmrover->useptr == baseptr)
1052                         break;
1053
1054                 mm->mmrover = mm->mmrover->next;
1055
1056                 if(!mm->mmrover)
1057                         mm->mmrover = mm->mmhead;
1058                 else if(mm->mmrover == start)
1059                 {
1060                         printf("MM_SetPurge: Block not found!");
1061                         return;
1062                 }
1063
1064         } while(1);
1065
1066         mm->mmrover->attributes &= ~PURGEBITS;
1067         mm->mmrover->attributes |= purge;
1068 }
1069
1070 //==========================================================================
1071
1072 /*
1073 =====================
1074 =
1075 = MM_SetLock
1076 =
1077 = Locks / unlocks the block
1078 =
1079 =====================
1080 */
1081
1082 void MM_SetLock(memptr *baseptr, boolean locked, mminfo_t *mm)
1083 {
1084         mmblocktype huge *start;
1085
1086         start = mm->mmrover;
1087
1088         do
1089         {
1090                 if(mm->mmrover->useptr == baseptr)
1091                         break;
1092
1093                 mm->mmrover = mm->mmrover->next;
1094
1095                 if(!mm->mmrover)
1096                         mm->mmrover = mm->mmhead;
1097                 else if(mm->mmrover == start)
1098                 {
1099                         printf("MM_SetLock: Block not found!");
1100                         return;
1101                 }
1102
1103         } while(1);
1104
1105         mm->mmrover->attributes &= ~LOCKBIT;
1106         mm->mmrover->attributes |= locked*LOCKBIT;
1107 }
1108
1109 //==========================================================================
1110
1111 /*
1112 =====================
1113 =
1114 = MM_SortMem
1115 =
1116 = Throws out all purgable stuff and compresses movable blocks
1117 =
1118 =====================
1119 */
1120
1121 void MM_SortMem(mminfo_t *mm)
1122 {
1123         mmblocktype huge *scan,huge *last,huge *next;
1124         unsigned        start,length,source,dest,oldborder;
1125         int                     playing;
1126
1127         //
1128         // lock down a currently playing sound
1129         //
1130 /*++++  playing = SD_SoundPlaying ();
1131         if(playing)
1132         {
1133                 switch (SoundMode)
1134                 {
1135                 case sdm_PC:
1136                         playing += STARTPCSOUNDS;
1137                         break;
1138                 case sdm_AdLib:
1139                         playing += STARTADLIBSOUNDS;
1140                         break;
1141                 }
1142                 MM_SetLock(&(memptr)audiosegs[playing],true);
1143         }
1144
1145
1146         SD_StopSound();*/
1147 //      oldborder = bordercolor;
1148 //      VW_ColorBorder (15);
1149
1150         if(beforesort)
1151                 beforesort();
1152
1153         scan = mm->mmhead;
1154
1155         last = NULL;            // shut up compiler warning
1156
1157         while(scan)
1158         {
1159                 if(scan->attributes & LOCKBIT)
1160                 {
1161                 //
1162                 // block is locked, so try to pile later blocks right after it
1163                 //
1164                         start = scan->start + scan->length;
1165                 }
1166                 else
1167                 {
1168                         if(scan->attributes & PURGEBITS)
1169                         {
1170                         //
1171                         // throw out the purgable block
1172                         //
1173                                 next = scan->next;
1174                                 FREEBLOCK(scan);
1175                                 //MM_FreeBlock(scan, mm);
1176                                 last->next = next;
1177                                 scan = next;
1178                                 continue;
1179                         }
1180                         else
1181                         {
1182                         //
1183                         // push the non purgable block on top of the last moved block
1184                         //
1185                                 if(scan->start != start)
1186                                 {
1187                                         length = scan->length;
1188                                         source = scan->start;
1189                                         dest = start;
1190                                         while(length > 0xf00)
1191                                         {
1192                                                 movedata(source,0,dest,0,0xf00*16);
1193                                                 length -= 0xf00;
1194                                                 source += 0xf00;
1195                                                 dest += 0xf00;
1196                                         }
1197                                         movedata(source,0,dest,0,length*16);
1198
1199                                         scan->start = start;
1200                                         *(unsigned *)scan->useptr = start;
1201                                 }
1202                                 start = scan->start + scan->length;
1203                         }
1204                 }
1205
1206                 last = scan;
1207                 scan = scan->next;              // go to next block
1208         }
1209
1210         mm->mmrover = mm->mmhead;
1211
1212         if(aftersort)
1213                 aftersort();
1214
1215 //      VW_ColorBorder (oldborder);
1216
1217 /*++++  if(playing)
1218                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
1219 }
1220
1221 //==========================================================================
1222
1223 /*
1224 =====================
1225 =
1226 = MM_ShowMemory
1227 =
1228 =====================
1229 */
1230
1231 void MM_ShowMemory(global_game_variables_t *gvar,/*page_t *page, */mminfo_t *mm)
1232 {
1233         mmblocktype huge *scan;
1234         word temp;
1235         sdword  end,owner;
1236         //word chx,chy;
1237         word w;
1238         dword wwww;
1239         byte    scratch[160],scratch0[4096],str[16];
1240         //byte d = '#';
1241 //****  VW_SetDefaultColors();
1242 //****  VW_SetLineWidth(40);
1243 //++++mh        temp = bufferofs;
1244 //++++mh        bufferofs = 0;
1245 //****  VW_SetScreen (0,0);
1246         scan = mm->mmhead;
1247         end = -1;
1248
1249         CA_OpenDebug (gvar);
1250         w=0;
1251         while(scan)
1252         {
1253                 strcpy(scratch, AARESET);
1254                 if(scan->attributes & PURGEBITS)
1255                         strcpy(scratch0, AAMAGENTA);            // dark purple = purgable
1256                 else
1257                         strcpy(scratch0, AABLUE);               // medium blue = non purgable
1258                 if(scan->attributes & LOCKBIT)
1259                         strcpy(scratch0, AARED);                // red = locked
1260                 if(scan->start<=end)
1261                 {
1262                         printf("\nend==%d\n\n", end);
1263                         strcat(scratch, "MM_ShowMemory: Memory block order currupted!\n");
1264                         strcat(scratch, "End's Size: ");
1265                         ultoa (end,str,10);
1266                         strcat (scratch,str);
1267                         strcat(scratch, "\nscan->start's Size: ");
1268                         ultoa (scan->start,str,10);
1269                         strcat (scratch,str);
1270                         write(gvar->handle.debughandle,scratch,strlen(scratch));
1271                         //modexprint(&page, chx, chy, 1, 0, 24, "\nMM_ShowMemory: Memory block order currupted!\n");
1272                         break;
1273                 }
1274                 end = scan->start+(scan->length)-1;
1275 //++++          chy = scan->start/320;
1276 //++++          chx = scan->start%320;
1277                                 //modexhlin(page, scan->start, (unsigned)end, chy, color);
1278                                 //for(chx=scan->start;chx+4>=(word)end;chx+=4)
1279                                 //{
1280 //++++                                  modexClearRegion(page, chx, chy, 4, 4, color);
1281                                 //}
1282 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1283                 for(w=(scan->start)/80;w<=end/80;w++)
1284                 {
1285                         //printf("+     %u      %lu\n", w, scan->length);
1286                         strcat(scratch0, "+");
1287                 }
1288                 strcat(scratch0, AARESET); strcat(scratch0, AAGREY); strcat(scratch0,"_");
1289 //++++          VW_Plot(scan->start,0,15);
1290 //++++                          modexClearRegion(page, chx, chy, 4, 4, 15);
1291 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1292
1293                 wwww=(dword)(scan->next->start)-(dword)scan->start;
1294                 //wwww=(dword)scan->start+(dword)(scan->next->start);
1295                 if (scan->next && scan->next->start >= end+1)
1296                 {
1297                         strcat(scratch0, AARESET);
1298                         strcat(scratch0, "\n");
1299                         strcat(scratch0,AAGREEN);
1300                         for(w=(end+1)/80;w<=(wwww/80);w++)
1301                         {
1302                                 //printf("0     %x      %u      %lu\n", scan->next->start, w, scan->length);
1303                                 strcat(scratch0,"0");
1304                         }
1305                         //printf("==================\n");
1306                         //printf("w=%x  start=%x        next=%x end=%u  %lu\n", w, scan->start, (scan->next->start), end+1, wwww);
1307                         //printf("==================\n");
1308                 }/*else {//if(scan->next->start <= scan->start){
1309                         scan->next->start=scan->start+0x1000;
1310                         wwww=(dword)(scan->next->start)-(dword)scan->start;
1311                         strcat(scratch0, AARESET);
1312                         strcat(scratch0, "\n");
1313                         strcat(scratch0,AAGREEN);
1314                         for(w=(end+1);w<=(0x1000/80);w++)
1315                         {
1316                                 //printf("0     %x      %x      %u\n", scan->start, w);
1317                                 strcat(scratch0,"0");
1318                         }
1319                         printf("================\n");
1320                         printf("w=%x    start=%x        next=%x end=%u  %lu\n", w, scan->start, (scan->next->start), end+1, wwww);
1321                         printf("================\n");
1322 //                      getch();
1323                 }*/
1324                 strcat(scratch0, AARESET);
1325                 strcat(scratch0,"\n");
1326                         //for(chx=scan->next->start;chx+4>=(word)end+1;chx+=4)
1327                         //{
1328 //                              chx+=scan->next->start;
1329 //                              modexClearRegion(page, chx, chy, 4, 4, 2);
1330                         //}
1331                                         //modexhlin(page, end+1,scan->next->start, chy, 0);
1332 /*              y = scan->start/320;
1333                 x = scan->start%320;
1334                 VW_Hlin(x,x+end,y,color);
1335                 VW_Plot(x,y,15);*/
1336 //++++                  VW_Hlin(x+end+1,x+(scan->next->start-scan->start),y,0); // black = free
1337                 strcat(scratch,"Seg:");
1338                 ultoa (scan->start,str,16);
1339                 strcat (scratch,str);
1340                 strcat (scratch,"\tSize:");
1341                 ultoa ((word)scan->length,str,10);
1342                 strcat (scratch,str);
1343                 strcat (scratch,"\tOwner:0x");
1344                 owner = (unsigned)scan->useptr;
1345                 ultoa (owner,str,16);
1346                 strcat (scratch,str);
1347                 strcat (scratch,"\n");
1348                 write(gvar->handle.debughandle,scratch,strlen(scratch));
1349                 write(gvar->handle.debughandle,scratch0,strlen(scratch0));
1350 //modexprint(page, chx, chy, 1, 0, 24, &scratch);
1351 //++++chy+=4;
1352 //fprintf(stdout, "%s", scratch);
1353
1354                 scan = scan->next;
1355         }
1356
1357         CA_CloseDebug (gvar);
1358
1359 //++++mh        IN_Ack();
1360 //****  VW_SetLineWidth(64);
1361 //++++mh        bufferofs = temp;
1362 }
1363
1364 //==========================================================================
1365
1366 /*
1367 =====================
1368 =
1369 = MM_DumpData
1370 =
1371 =====================
1372 */
1373
1374 void MM_DumpData(mminfo_t *mm)
1375 {
1376         mmblocktype huge *scan,huge *best;
1377         long    lowest,oldlowest;
1378         word    owner;
1379         byte    lock,purge;
1380         FILE    *dumpfile;
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*16lu;
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*16lu;
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         printf("TotalUsed=%lu\n", mmi->mainmem+mmi->EMSmem+mmi->XMSmem+mmi->XMSmem);
1521 }
1522
1523 //==========================================================================
1524
1525 /*
1526 =====================
1527 =
1528 = MM_EMSerr
1529 =
1530 =====================
1531 */
1532
1533 void MM_EMSerr(byte *stri, byte err)
1534 {
1535         //Returns a text string describing the error code in EMS.Error.
1536         switch(err)
1537         {
1538                 case 0x0:
1539                         strcat(stri, "successful");
1540                 break;
1541                 case 0x80:
1542                         strcat(stri, "internal error");
1543                 break;
1544                 case 0x81:
1545                         strcat(stri, "hardware malfunction");
1546                 break;
1547                 case 0x82:
1548                         strcat(stri, "busy .. retry later");
1549                 break;
1550                 case 0x83:
1551                         strcat(stri, "invalid handle");
1552                 break;
1553                 case 0x84:
1554                         strcat(stri, "undefined function requested by application");
1555                 break;
1556                 case 0x85:
1557                         strcat(stri, "no more handles available");
1558                 break;
1559                 case 0x86:
1560                         strcat(stri, "error in save or restore of mapping context");
1561                 break;
1562                 case 0x87:
1563                         strcat(stri, "insufficient memory pages in system");
1564                 break;
1565                 case 0x88:
1566                         strcat(stri, "insufficient memory pages available");
1567                 break;
1568                 case 0x89:
1569                         strcat(stri, "zero pages requested");
1570                 break;
1571                 case 0x8A:
1572                         strcat(stri, "invalid logical page number encountered");
1573                 break;
1574                 case 0x8B:
1575                         strcat(stri, "invalid physical page number encountered");
1576                 break;
1577                 case 0x8C:
1578                         strcat(stri, "page-mapping hardware state save area is full");
1579                 break;
1580                 case 0x8D:
1581                         strcat(stri, "save of mapping context failed");
1582                 break;
1583                 case 0x8E:
1584                         strcat(stri, "restore of mapping context failed");
1585                 break;
1586                 case 0x8F:
1587                         strcat(stri, "undefined subfunction");
1588                 break;
1589                 case 0x90:
1590                         strcat(stri, "undefined attribute type");
1591                 break;
1592                 case 0x91:
1593                         strcat(stri, "feature not supported");
1594                 break;
1595                 case 0x92:
1596                         strcat(stri, "successful, but a portion of the source region has been overwritten");
1597                 break;
1598                 case 0x93:
1599                         strcat(stri, "length of source or destination region exceeds length of region allocated to either source or destination handle");
1600                 break;
1601                 case 0x94:
1602                         strcat(stri, "conventional and expanded memory regions overlap");
1603                 break;
1604                 case 0x95:
1605                         strcat(stri, "offset within logical page exceeds size of logical page");
1606                 break;
1607                 case 0x96:
1608                         strcat(stri, "region length exceeds 1 MB");
1609                 break;
1610                 case 0x97:
1611                         strcat(stri, "source and destination EMS regions have same handle and overlap");
1612                 break;
1613                 case 0x98:
1614                         strcat(stri, "memory source or destination type undefined");
1615                 break;
1616                 case 0x9A:
1617                         strcat(stri, "specified alternate map register or DMA register set not supported");
1618                 break;
1619                 case 0x9B:
1620                         strcat(stri, "all alternate map register or DMA register sets currently allocated");
1621                 break;
1622                 case 0x9C:
1623                         strcat(stri, "alternate map register or DMA register sets not supported");
1624                 break;
1625                 case 0x9D:
1626                         strcat(stri, "undefined or unallocated alternate map register or DMA register set");
1627                 break;
1628                 case 0x9E:
1629                         strcat(stri, "dedicated DMA channels not supported");
1630                 break;
1631                 case 0x9F:
1632                         strcat(stri, "specified dedicated DMA channel not supported");
1633                 break;
1634                 case 0xA0:
1635                         strcat(stri, "no such handle name");
1636                 break;
1637                 case 0xA1:
1638                         strcat(stri, "a handle found had no name, or duplicate handle name");
1639                 break;
1640                 case 0xA2:
1641                         strcat(stri, "attempted to wrap around 1M conventional address space");
1642                 break;
1643                 case 0xA3:
1644                         strcat(stri, "source array corrupted");
1645                 break;
1646                 case 0xA4:
1647                         strcat(stri, "operating system denied access");
1648                 break;
1649                 default:
1650                         strcat(stri, "undefined error");
1651         }
1652 }
1653
1654 //==========================================================================
1655
1656 /*
1657 =====================
1658 =
1659 = MM_BombOnError
1660 =
1661 =====================
1662 */
1663
1664 void MM_BombOnError(boolean bomb, mminfo_t *mm)
1665 {
1666         mm->bombonerror = bomb;
1667 }
1668
1669 /*void MM_GetNewBlock(mminfo_t *mm)
1670 {
1671         if(!mm->mmfree)
1672                 MML_ClearBlock(mm);
1673         mm->mmnew=mm->mmfree;
1674         mm->mmfree=mm->mmfree->next;
1675         if(!(mm->mmnew=mm->mmfree))
1676         {
1677                 printf("MM_GETNEWBLOCK: No free blocks!\n");
1678                 return;
1679         }
1680         mm->mmfree=mm->mmfree->next;
1681 }
1682
1683 void MM_FreeBlock(mmblocktype *x, mminfo_t *mm)
1684 {
1685         x->useptr=NULL;
1686         x->next=mm->mmfree;
1687         mm->mmfree=x;
1688 }*/
1689
1690 /*void MM_seguin(void)
1691 {
1692         __asm {
1693                 push    ds
1694                 mov     ax,ds
1695                 inc             ax
1696                 mov     ds,ax
1697         }
1698 }
1699
1700 void MM_segude(void)
1701 {
1702         __asm {
1703                 pop ds
1704         }
1705 }*/
1706
1707 /*
1708 pull data from far and put it into ds var
1709 mov ax,es:si
1710 mov x,ax
1711 */
1712 /*
1713 ss stack segment
1714 sp top of stack
1715 bp bottem of stack
1716 */