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_pm.h"
  51 #include "src/lib/16_ca.h"
  52 #pragma hdrstop
  53
  54 #pragma warn -pro
  55 #pragma warn -use
  56
  57 /*
  58 =============================================================================
  59
  60                                                  GLOBAL VARIABLES
  61
  62 =============================================================================
  63 */
  64
  65 void            (* beforesort) (void);
  66 void            (* aftersort) (void);
  67 void            (* XMSaddr) (void);             // far pointer to XMS driver
  68
  69 /*
  70 =============================================================================
  71
  72                                                  LOCAL VARIABLES
  73
  74 =============================================================================
  75 */
  76
  77 static  char *ParmStringsexmm[] = {"noems","noxms",""};
  78
  79 /*
  80 ======================
  81 =
  82 = MML_CheckForEMS
  83 =
  84 = Routine from p36 of Extending DOS
  85 =
  86 =======================
  87 */
  88
  89 boolean MML_CheckForEMS(void)
  90 {
  91         boolean emmcfems;
  92         static char     emmname[] = "EMMXXXX0"; //fix by andrius4669
  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(global_game_variables_t *gvar)
 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         gvar->mm.totalEMSpages=totalEMSpages;
 250         gvar->mm.freeEMSpages=freeEMSpages;
 251         gvar->mm.EMSpageframe=EMSpageframe;
 252         gvar->mm.EMSpagesmapped=EMSpagesmapped;
 253         gvar->mm.EMShandle=EMShandle;
 254         gvar->mm.EMSVer=EMSVer;
 255         return 0;
 256 }
 257
 258
 259 /*
 260 ======================
 261 =
 262 = MML_ShutdownEMS
 263 =
 264 =======================
 265 */
 266
 267 void MML_ShutdownEMS(global_game_variables_t *gvar)
 268 {
 269         boolean errorflag=false;
 270         unsigned EMShandle=gvar->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)
 289                 Quit("MML_ShutdownEMS: Error freeing EMS!\n");  //++++ add something
 290 }
 291
 292 /*
 293 ====================
 294 =
 295 = MM_MapEMS
 296 =
 297 = Maps the 64k of EMS used by memory manager into the page frame
 298 = for general use.  This only needs to be called if you are keeping
 299 = other things in EMS.
 300 =
 301 ====================
 302 */
 303
 304 byte MM_MapEMS(global_game_variables_t *gvar)
 305 {
 306         byte    str[160];
 307         unsigned        EMShandle;
 308         byte err;
 309         boolean errorflag=false;
 310         int     i;
 311         EMShandle=gvar->mm.EMShandle;
 312
 313         for (i=0;i<4/*MAPPAGES*/;i++)
 314         {
 315                 __asm {
 316                         mov     ah,EMS_MAPPAGE
 317                         mov     bx,[i]                  // logical page
 318                         mov     al,bl                   // physical page
 319                         mov     dx,[EMShandle]  // handle
 320                         int     EMS_INT
 321                         or      ah,ah
 322                         jnz     error
 323                         jmp End
 324 #ifdef __BORLANDC__
 325                 }
 326 #endif
 327                         error:
 328 #ifdef __BORLANDC__
 329                 __asm {
 330 #endif
 331                         mov     err,ah
 332                         mov     errorflag,1
 333 #ifdef __BORLANDC__
 334                 }
 335 #endif
 336                         End:
 337 #ifdef __WATCOMC__
 338                 }
 339 #endif
 340                 if(errorflag==true)
 341                 {
 342                         strcpy(str,"MM_MapEMS: EMS error ");
 343                         MM_EMSerr(str, err);
 344                         printf("%s\n",str);
 345                         return err;
 346                 }
 347         }
 348         gvar->mmi.EMSmem = (i)*0x4000lu;
 349         //printf("              gvar->mmi.EMSmem=%lu\n", gvar->mmi.EMSmem);
 350         return 0;
 351 }
 352
 353 byte MM_MapXEMS(global_game_variables_t *gvar)
 354 {
 355 //SUB EMS.MapXPages (PhysicalStart, LogicalStart, NumPages, Handle)
 356
 357         //Maps up to 4 logical EMS pages to physical pages in the page frame, where:
 358         //PhysicalStart = Physical page first logical page is mapped to
 359         //LogicalStart  = First logical page to map
 360         //NumPages      = Number of pages to map (1 to 4)
 361         //Handle        = EMS handle logical pages are allocated to
 362
 363   /*//Create a buffer containing the page information
 364 //  FOR x = 0 TO NumPages - 1
 365 //    MapInfo$ = MapInfo$ + MKI$(LogicalStart + x) + MKI$(PhysicalStart + x)
 366 //  NEXT*/
 367
 368 //  Regs.ax = 0x5000                           //Map the pages in the buffer
 369 //  Regs.cx = NumPages                         //to the pageframe
 370 //  Regs.dx = Handle
 371 //  Regs.ds = VARSEG(MapInfo$)
 372 //  Regs.si = SADD(MapInfo$)
 373 //  InterruptX 0x67, Regs, Regs
 374 //      EMS.Error = (Regs.ax AND 0xFF00&) \ 0x100  //Store the status code
 375
 376 //END SUB
 377         byte    str[160];
 378         byte err;
 379         word    EMShandle;
 380         boolean errorflag=false;
 381         int     i;
 382         EMShandle=gvar->mm.EMShandle;
 383
 384         if(gvar->mm.EMSVer<0x40)
 385                 return 5;
 386
 387         for (i=0;i<MAPPAGES;i++)
 388         {
 389                 __asm {
 390                         mov     ah,EMS_MAPXPAGE
 391                         mov     cx,[i]                  // logical page
 392                         mov     al,bl                   // physical page
 393                         mov     dx,[EMShandle]  // handle
 394                         int     EMS_INT
 395                         or      ah,ah
 396                         jnz     error
 397                         jmp End
 398 #ifdef __BORLANDC__
 399                 }
 400 #endif
 401                         error:
 402 #ifdef __BORLANDC__
 403                 __asm {
 404 #endif
 405                         mov     err,ah
 406                         mov     errorflag,1
 407 #ifdef __BORLANDC__
 408                 }
 409 #endif
 410                         End:
 411 #ifdef __WATCOMC__
 412                 }
 413 #endif
 414                 if(errorflag==true)
 415                 {
 416                         //strcpy(str,"MM_MapXEMS: EMS error 0x");
 417                         strcpy(str,"MM_MapXEMS: EMS error ");
 418                         //itoa(err,str2,16);
 419                         MM_EMSerr(str, err);
 420                         printf("%s\n",str);
 421                         //printf("%s%x\n",str, err);
 422                         //printf("FACK! %x\n", err);
 423                         return err;
 424                 }
 425         }
 426         gvar->mmi.EMSmem = (i)*0x4000lu;
 427         return 0;
 428 }
 429
 430 //==========================================================================
 431
 432 /*
 433 ======================
 434 =
 435 = MML_CheckForXMS
 436 =
 437 = Check for XMM driver
 438 =
 439 =======================
 440 */
 441
 442 boolean MML_CheckForXMS(global_game_variables_t *gvar)
 443 {
 444         boolean errorflag=false;
 445         gvar->mm.numUMBs = 0;
 446
 447         __asm {
 448                 mov     ax,0x4300
 449                 int     0x2f                            // query status of installed diver
 450                 cmp     al,0x80
 451                 je      good
 452                 mov     errorflag,1
 453 #ifdef __BORLANDC__
 454         }
 455 #endif
 456                 good:
 457 #ifdef __WATCOMC__
 458         }
 459 #endif
 460         if(errorflag==true) return false;
 461         else return true;
 462 }
 463
 464
 465 /*
 466 ======================
 467 =
 468 = MML_SetupXMS
 469 =
 470 = Try to allocate all upper memory block
 471 =
 472 =======================
 473 */
 474
 475 void MML_SetupXMS(global_game_variables_t *gvar)
 476 {
 477         word    base,size;
 478
 479
 480         __asm {
 481                 mov     ax,0x4310
 482                 int     0x2f
 483                 mov     [WORD PTR XMSaddr],bx
 484                 mov     [WORD PTR XMSaddr+2],es         // function pointer to XMS driver
 485         }
 486 getmemory:
 487         __asm {
 488                 mov     ah,XMS_ALLOCUMB
 489                 mov     dx,0xffff                                       // try for largest block possible
 490                 //mov     ax,dx                                         // Set available Kbytes.
 491                 call    [DWORD PTR XMSaddr]
 492                 or      ax,ax
 493                 jnz     gotone
 494
 495                 cmp     bl,0xb0                                         // error: smaller UMB is available
 496                 jne     done;
 497
 498                 mov     ah,XMS_ALLOCUMB
 499                 call    [DWORD PTR XMSaddr]             // DX holds largest available UMB
 500                 or      ax,ax
 501                 jz      done                                            // another error...
 502 #ifdef __BORLANDC__
 503         }
 504 #endif
 505                 gotone:
 506 #ifdef __BORLANDC__
 507         __asm {
 508 #endif
 509                 mov     [base],bx
 510                 mov     [size],dx
 511 #ifdef __BORLANDC__
 512         }
 513 #endif
 514                 done:
 515 #ifdef __WATCOMC__
 516         }
 517 #endif
 518 //      printf("base=%u ", base); printf("size=%u\n", size);
 519         MML_UseSpace(base,size, gvar);
 520         gvar->mmi.XMSmem += size*16;
 521         gvar->mm.UMBbase[gvar->mm.numUMBs] = base;
 522         gvar->mm.numUMBs++;
 523         if(gvar->mm.numUMBs < MAXUMBS)
 524                 goto getmemory;
 525 }
 526
 527
 528 /*
 529 ======================
 530 =
 531 = MML_ShutdownXMS
 532 =
 533 ======================
 534 */
 535
 536 void MML_ShutdownXMS(global_game_variables_t *gvar)
 537 {
 538         int     i;
 539         unsigned        base;
 540
 541         for (i=0;i<gvar->mm.numUMBs;i++)
 542         {
 543                 base = gvar->mm.UMBbase[i];
 544                 __asm {
 545                         mov     ah,XMS_FREEUMB
 546                         mov     dx,[base]
 547                         call    [DWORD PTR XMSaddr]
 548                 }
 549         }
 550 }
 551
 552 //==========================================================================
 553
 554 /*
 555 ======================
 556 =
 557 = MML_UseSpace
 558 =
 559 = Marks a range of paragraphs as usable by the memory manager
 560 = This is used to mark space for the near heap, far heap, ems page frame,
 561 = and upper memory blocks
 562 =
 563 ======================
 564 */
 565
 566 /*void MML_UseSpace(word segstart, dword seglength, global_game_variables_t *gvar)
 567 {
 568         //huge mmblocktype huge *scan,huge *last;
 569         word            segm=1;
 570         word    oldend;
 571         dword           segmlen;
 572         dword           extra;
 573
 574         scan = last = gvar->mm.mmhead;
 575         gvar->mm.mmrover = gvar->mm.mmhead;             // reset rover to start of memory
 576
 577 //
 578 // search for the block that contains the range of segments
 579 //
 580         while(scan->start+scan->length < segstart)
 581         {
 582                 last = scan;
 583                 scan = scan->next;
 584         }
 585
 586 //
 587 // take the given range out of the block
 588 //
 589         oldend = scan->start + scan->length;
 590         extra = oldend - (segstart+seglength);
 591
 592         segmlen=extra;
 593
 594         //++++emsver stuff!
 595         if(segm>1)/// || extra>=0x10000lu)
 596         //if(extra>0xfffflu)
 597         {
 598                 scan->blob=segm;
 599
 600                 //MML_UseSpace(segstart, seglength, gvar);
 601
 602                 printf("MML_UseSpace: Segment spans two blocks!\n");
 603         //}
 604         printf("segm=%u         ", segm);
 605         printf("ex=%lu  ", extra);
 606         printf("old=%u  ", oldend);
 607         printf("start+seglen=%lu\n", segstart+seglength);
 608         printf("segsta=%x       ", segstart);
 609         printf("len=%lu ", scan->length);
 610         printf("seglen=%lu      ", seglength);
 611         printf("segmlen=%lu\n", segmlen);
 612         }
 613 //++++todo: linked list of segment!
 614         if(segstart == scan->start)
 615         {
 616                 last->next = scan->next;                        // unlink block
 617                 FREEBLOCK(scan);
 618                 scan = last;
 619         }
 620         else
 621                 scan->length = segstart-scan->start;    // shorten block
 622
 623         if(extra > 0)
 624         {
 625                 GETNEWBLOCK;
 626                 gvar->mm.mmnew->useptr = NULL;
 627
 628                 gvar->mm.mmnew->next = scan->next;
 629                 scan->next = gvar->mm.mmnew;
 630                 gvar->mm.mmnew->start = segstart+seglength;
 631                 gvar->mm.mmnew->length = extra;
 632                 gvar->mm.mmnew->attributes = LOCKBIT;
 633         }//else if(segm>0) goto segu;
 634
 635 }*/
 636 void MML_UseSpace(word segstart, dword seglength, global_game_variables_t *gvar)
 637 {
 638         mmblocktype far *scan,far *last;
 639         word    oldend;
 640         sdword          extra;
 641         //word segm=1;
 642
 643         scan = last = gvar->mm.mmhead;
 644         gvar->mm.mmrover = gvar->mm.mmhead;             // reset rover to start of memory
 645
 646 //
 647 // search for the block that contains the range of segments
 648 //
 649         while (scan->start+scan->length < segstart)
 650         {
 651                 last = scan;
 652                 scan = scan->next;
 653         }
 654
 655 //
 656 // find out how many blocks it spans!
 657 //
 658         /*for(;seglength>=0x10000;seglength-=0xFFFF)
 659         {
 660                 //printf("      seglen=%lu\n", segmlen);
 661                 segm++;
 662         }*/
 663
 664 //
 665 // take the given range out of the block
 666 //
 667         oldend = scan->start + scan->length;
 668         extra = oldend - (segstart+((unsigned)seglength));
 669         if (extra < 0)
 670         {
 671                 printf("========================================\n");
 672                 printf("start=%x        ", scan->start);
 673                 printf("old=%u  ", oldend);
 674                 printf("start+seglen=%lu\n", segstart+seglength);
 675                 printf("segsta=%x       ", segstart);
 676                 printf("len=%lu ", scan->length);
 677                 printf("seglen=%lu      ", seglength);
 678                 printf("\n");
 679                 printf("MML_UseSpace: Segment spans two blocks! %d\n", extra);
 680                 printf("========================================\n");
 681                 //return;
 682         }
 683
 684         if (segstart == scan->start)
 685         {
 686                 last->next = scan->next;                        // unlink block
 687                 FREEBLOCK(scan);
 688                 scan = last;
 689         }
 690         else
 691                 scan->length = segstart-scan->start;    // shorten block
 692
 693         if (extra > 0)
 694         {
 695                 GETNEWBLOCK;
 696                 gvar->mm.mmnew->useptr = NULL;
 697
 698                 gvar->mm.mmnew->next = scan->next;
 699                 scan->next = gvar->mm.mmnew;
 700                 gvar->mm.mmnew->start = segstart+seglength;
 701                 gvar->mm.mmnew->length = extra;
 702                 gvar->mm.mmnew->attributes = LOCKBIT;
 703         }
 704
 705 }
 706
 707 //==========================================================================
 708
 709 /*
 710 ====================
 711 =
 712 = MML_ClearBlock
 713 =
 714 = We are out of blocks, so free a purgable block
 715 =
 716 ====================
 717 */
 718
 719 void MML_ClearBlock(global_game_variables_t *gvar)
 720 {
 721         //huge mmblocktype huge *scan,huge *last;
 722         mmblocktype far *scan,far *last;
 723
 724         scan = gvar->mm.mmhead->next;
 725
 726         while(scan)
 727         {
 728                 if(!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS))
 729                 {
 730                         MM_FreePtr(scan->useptr, gvar);
 731                         return;
 732                 }
 733                 scan = scan->next;
 734         }
 735
 736         printf("MM_ClearBlock: No purgable blocks!\n");
 737 }
 738
 739
 740 //==========================================================================
 741
 742 /*
 743 ===================
 744 =
 745 = MM_Startup
 746 =
 747 = Grabs all space from turbo with malloc/farmalloc
 748 = Allocates bufferseg misc buffer
 749 =
 750 ===================
 751 */
 752
 753 void MM_Startup(global_game_variables_t *gvar)
 754 {
 755         int i;
 756         //dword length,seglength;
 757         dword length; word seglength;
 758         //huge void huge        *start;
 759         void far        *start;
 760         word    segstart;//,endfree;
 761         //memptr *peeonself;
 762
 763         if(gvar->mm.mmstarted)
 764                 MM_Shutdown(gvar);
 765
 766         gvar->mm.mmstarted = true;
 767         gvar->mm.bombonerror = true;
 768
 769 //
 770 // set up the linked list (everything in the free list;
 771 //
 772         gvar->mm.mmhead = NULL;
 773         gvar->mm.mmfree = &(gvar->mm.mmblocks[0]);
 774         for(i=0;i<MAXBLOCKS-1;i++)
 775         {
 776                 gvar->mm.mmblocks[i].next = &(gvar->mm.mmblocks[i+1]);
 777         }
 778         gvar->mm.mmblocks[i].next = NULL;
 779
 780 //
 781 // locked block of all memory until we punch out free space
 782 //
 783         GETNEWBLOCK;
 784         gvar->mm.mmhead = gvar->mm.mmnew;                               // this will allways be the first node
 785         gvar->mm.mmnew->start = 0;
 786         gvar->mm.mmnew->length = 0xffff;
 787         gvar->mm.mmnew->attributes = LOCKBIT;
 788         gvar->mm.mmnew->next = NULL;
 789         //gvar->mm.mmnew->useptr = peeonself;
 790         gvar->mm.mmrover = gvar->mm.mmhead;
 791
 792         //printf("              %x\n", peeonself);
 793         //printf("              %x\n", *peeonself);
 794 //
 795 // get all available near conventional memory segments
 796 //
 797 #ifdef __WATCOMC__
 798         _nheapgrow();
 799         length=(dword)_memavl();//(dword)GetFreeSize();
 800         //huge start = (void huge *)(gvar->mm.nearheap = _nmalloc(length));
 801         start = (void far *)(gvar->mm.nearheap = _nmalloc(length));
 802 #endif
 803 #ifdef __BORLANDC__
 804         length=coreleft();
 805         //huge start = (void huge *)(gvar->mm.nearheap = malloc(length));
 806         start = (void far *)(gvar->mm.nearheap = malloc(length));
 807 #endif
 808         length -= 16-(FP_OFF(start)&15);
 809         length -= SAVENEARHEAP;
 810         seglength = length / 16;                        // now in paragraphs
 811         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 812         MML_UseSpace(segstart,seglength, gvar);
 813         gvar->mmi.nearheap = length;
 814         //printf("start=%Fp     segstart=%x     seglen=%lu      len=%lu\n", start, segstart, seglength, length);
 815
 816 //
 817 // get all available far conventional memory segments
 818 //
 819         //printf("_FARCORELEFT                          %lu\n", _FCORELEFT);
 820 #ifdef __WATCOMC__
 821         _fheapgrow();
 822 #endif
 823 #ifdef __BORLANDC__
 824         printf("farcoreleft()                           %lu\n", farcoreleft());
 825         printf("(farcoreleft()+32)-_FCORELEFT   %d\n", (sword)((farcoreleft()+32)-_FCORELEFT));
 826 #endif
 827         length=_FCORELEFT;//_fcoreleft();//(dword)GetFarFreeSize();//0xffffUL*4UL;
 828         start = gvar->mm.farheap = _fmalloc(length);
 829         //start = gvar->mm.farheap = halloc(length, 1);
 830         length -= 16-(FP_OFF(start)&15);
 831         length -= SAVEFARHEAP;
 832         seglength = length / 16;                        // now in paragraphs
 833         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 834         MML_UseSpace(segstart,seglength, gvar);
 835         gvar->mmi.farheap = length;
 836         //printf("start=%Fp     segstart=%x     seglen=%lu      len=%lu\n", start, segstart, seglength, length);
 837
 838         gvar->mmi.mainmem = gvar->mmi.nearheap + gvar->mmi.farheap;
 839
 840         if(pmdebug>0)
 841         {
 842 //
 843 // detect EMS and allocate up to 64K at page frame
 844 //
 845         gvar->mmi.EMSmem = 0;
 846 //goto emsskip; //0000
 847         for(i = 1;i <
 848 #ifdef __WATCOMC__
 849         __argc
 850 #endif
 851 #ifdef __BORLANDC__
 852         _argc
 853 #endif
 854         ;i++)
 855         {
 856                 if(US_CheckParm(
 857 #ifdef __WATCOMC__
 858         __argv[i]
 859 #endif
 860 #ifdef __BORLANDC__
 861         _argv[i]
 862 #endif
 863                         ,ParmStringsexmm) == 0)
 864                         goto emsskip;                           // param NOEMS
 865         }
 866         if(MML_CheckForEMS())
 867         {
 868                 MML_SetupEMS(gvar);                                     // allocate space
 869                 //TODO: EMS4! AND EMS 3.2 MASSIVE DATA HANDLMENT!
 870                 MML_UseSpace(gvar->mm.EMSpageframe,(MAPPAGES)*0x4000lu, gvar);
 871                 //if(gvar->pm.emm.EMSVer<0x40)
 872                         MM_MapEMS(gvar);                                        // map in used pages
 873                 //else
 874                         //MM_MapXEMS(gvar);                                     // map in used pages
 875         }
 876
 877 //
 878 // detect XMS and get upper memory blocks
 879 //
 880 emsskip:
 881         gvar->mmi.XMSmem = 0;
 882 goto xmsskip;//0000
 883         for(i = 1;i <
 884 #ifdef __WATCOMC__
 885         __argc
 886 #endif
 887 #ifdef __BORLANDC__
 888         _argc
 889 #endif
 890         ;i++)
 891         {
 892                 if(US_CheckParm(
 893 #ifdef __WATCOMC__
 894         __argv[i]
 895 #endif
 896 #ifdef __BORLANDC__
 897         _argv[i]
 898 #endif
 899                         ,ParmStringsexmm) == 0)
 900                         goto xmsskip;                           // param NOXMS
 901         }
 902         if(MML_CheckForXMS(gvar))
 903         {
 904                 MML_SetupXMS(gvar);                                     // allocate as many UMBs as possible
 905         }
 906         }
 907 //
 908 // allocate the misc buffer
 909 //
 910 xmsskip:
 911         gvar->mm.mmrover = gvar->mm.mmhead;             // start looking for space after low block
 912
 913         MM_GetPtr(&(gvar->mm.bufferseg),BUFFERSIZE, gvar);
 914 }
 915
 916 //==========================================================================
 917
 918 /*
 919 ====================
 920 =
 921 = MM_Shutdown
 922 =
 923 = Frees all conventional, EMS, and XMS allocated
 924 =
 925 ====================
 926 */
 927
 928 void MM_Shutdown(global_game_variables_t *gvar)
 929 {
 930         if(!(gvar->mm.mmstarted))
 931                 return;
 932
 933         _ffree(gvar->mm.farheap);//     printf("                far freed\n");
 934 #ifdef __WATCOMC__
 935         _nfree(gvar->mm.nearheap);//    printf("                near freed\n");
 936 #endif
 937 #ifdef __BORLANDC__
 938         free(gvar->mm.nearheap);//      printf("                near freed\n");
 939 #endif
 940         if(MML_CheckForEMS()){ MML_ShutdownEMS(gvar); }//printf("               EMS freed\n"); }
 941         if(MML_CheckForXMS(gvar)){ MML_ShutdownXMS(gvar); }//printf("           XMS freed\n"); }
 942 }
 943
 944 //==========================================================================
 945
 946 /*
 947 ====================
 948 =
 949 = MM_GetPtr
 950 =
 951 = Allocates an unlocked, unpurgable block
 952 =
 953 ====================
 954 */
 955
 956 void MM_GetPtr (memptr *baseptr, dword size, global_game_variables_t *gvar)
 957 {
 958         //huge mmblocktype huge *scan,huge *lastscan,huge *endscan,huge *purge,huge *next;
 959         mmblocktype far *scan,far *lastscan,far *endscan,far *purge,far *next;
 960         int                     search;
 961         unsigned        needed,startseg;
 962
 963         needed = (size+15)/16;          // convert size from bytes to paragraphs
 964
 965         GETNEWBLOCK;                            // fill in start and next after a spot is found
 966         gvar->mm.mmnew->length = needed;
 967         gvar->mm.mmnew->useptr = baseptr;
 968         //if(gvar->mm.mmnew->useptr==NULL){
 969 #ifdef __DEBUG__
 970                 printf("baseptr=%04x    ", baseptr); printf("useptr=%04x\n", gvar->mm.mmnew->useptr);
 971                 printf("*baseptr=%04x   ", *baseptr); printf("*useptr=%04x\n", *(gvar->mm.mmnew->useptr));
 972                 printf("*baseptr=%Fp    ", *baseptr); printf("*useptr=%Fp\n", *(gvar->mm.mmnew->useptr));
 973 #endif
 974         //exit(-5); }
 975         gvar->mm.mmnew->attributes = BASEATTRIBUTES;
 976
 977 //tryagain:
 978         for (search = 0; search<3; search++)
 979         {
 980         //
 981         // first search:        try to allocate right after the rover, then on up
 982         // second search:       search from the head pointer up to the rover
 983         // third search:        compress memory, then scan from start
 984                 if (search == 1 && gvar->mm.mmrover == gvar->mm.mmhead)
 985                         search++;
 986
 987                 switch (search)
 988                 {
 989                 case 0:
 990                         lastscan = gvar->mm.mmrover;
 991                         scan = gvar->mm.mmrover->next;
 992                         endscan = NULL;
 993                         break;
 994                 case 1:
 995                         lastscan = gvar->mm.mmhead;
 996                         scan = gvar->mm.mmhead->next;
 997                         endscan = gvar->mm.mmrover;
 998                         break;
 999                 case 2:
1000                         MM_SortMem (gvar);
1001                         lastscan = gvar->mm.mmhead;
1002                         scan = gvar->mm.mmhead->next;
1003                         endscan = NULL;
1004                         break;
1005                 }
1006
1007                 startseg = lastscan->start + lastscan->length;
1008
1009                 while (scan != endscan)
1010                 {
1011                         if (scan->start - startseg >= needed)
1012                         {
1013                         //
1014                         // got enough space between the end of lastscan and
1015                         // the start of scan, so throw out anything in the middle
1016                         // and allocate the new block
1017                         //
1018                                 purge = lastscan->next;
1019                                 lastscan->next = gvar->mm.mmnew;
1020                                 gvar->mm.mmnew->start = *(unsigned *)baseptr = startseg;
1021                                 gvar->mm.mmnew->next = scan;
1022                                 while ( purge != scan)
1023                                 {       // free the purgable block
1024                                         next = purge->next;
1025                                         FREEBLOCK(purge);
1026                                         purge = next;           // purge another if not at scan
1027                                 }
1028                                 gvar->mm.mmrover = gvar->mm.mmnew;
1029                                 return; // good allocation!
1030                         }
1031
1032                         //
1033                         // if this block is purge level zero or locked, skip past it
1034                         //
1035                         if ( (scan->attributes & LOCKBIT)
1036                                 || !(scan->attributes & PURGEBITS) )
1037                         {
1038                                 lastscan = scan;
1039                                 startseg = lastscan->start + lastscan->length;
1040                         }
1041
1042
1043                         scan=scan->next;                // look at next line
1044                 }
1045         }
1046
1047         if (gvar->mm.bombonerror)
1048         {
1049 #ifdef __WATCOMC__
1050                 //heapdump();
1051 #endif
1052                 printf(OUT_OF_MEM_MSG,(size-gvar->mmi.nearheap));
1053                 printf("for stability reasons the program will shut down! wwww\n");
1054                 MM_Shutdown(gvar);
1055                 exit(-1);
1056         }
1057         else
1058                 gvar->mm.mmerror = true;
1059 }
1060
1061 //==========================================================================
1062
1063 /*
1064 ====================
1065 =
1066 = MM_FreePtr
1067 =
1068 = Allocates an unlocked, unpurgable block
1069 =
1070 ====================
1071 */
1072
1073 void MM_FreePtr(memptr *baseptr, global_game_variables_t *gvar)
1074 {
1075         //huge mmblocktype huge *scan,huge *last;
1076         mmblocktype far *scan,far *last;
1077
1078         last = gvar->mm.mmhead;
1079         scan = last->next;
1080
1081         if(baseptr == gvar->mm.mmrover->useptr) // removed the last allocated block
1082                 gvar->mm.mmrover = gvar->mm.mmhead;
1083
1084         while(scan->useptr != baseptr && scan)
1085         {
1086                 last = scan;
1087                 scan = scan->next;
1088         }
1089
1090         if(!scan)
1091         {
1092                 printf("MM_FreePtr: Block not found!\n");
1093                 return;
1094         }
1095
1096         last->next = scan->next;
1097
1098         FREEBLOCK(scan);
1099 }
1100 //==========================================================================
1101
1102 /*
1103 =====================
1104 =
1105 = MM_SetPurge
1106 =
1107 = Sets the purge level for a block (locked blocks cannot be made purgable)
1108 =
1109 =====================
1110 */
1111
1112 void MM_SetPurge(memptr *baseptr, int purge, global_game_variables_t *gvar)
1113 {
1114         //huge mmblocktype huge *start;
1115         mmblocktype far *start;
1116
1117         start = gvar->mm.mmrover;
1118
1119         do
1120         {
1121                 if(gvar->mm.mmrover->useptr == baseptr)
1122                         break;
1123
1124                 gvar->mm.mmrover = gvar->mm.mmrover->next;
1125
1126                 if(!gvar->mm.mmrover)
1127                         gvar->mm.mmrover = gvar->mm.mmhead;
1128                 else if(gvar->mm.mmrover == start)
1129                 {
1130                         Quit("MM_SetPurge: Block not found!");
1131                         //return;
1132                 }
1133
1134         } while(1);
1135
1136         gvar->mm.mmrover->attributes &= ~PURGEBITS;
1137         gvar->mm.mmrover->attributes |= purge;
1138 }
1139
1140 //==========================================================================
1141
1142 /*
1143 =====================
1144 =
1145 = MM_SetLock
1146 =
1147 = Locks / unlocks the block
1148 =
1149 =====================
1150 */
1151
1152 void MM_SetLock(memptr *baseptr, boolean locked, global_game_variables_t *gvar)
1153 {
1154         //huge mmblocktype huge *start;
1155         mmblocktype far *start;
1156
1157         start = gvar->mm.mmrover;
1158
1159         do
1160         {
1161                 if(gvar->mm.mmrover->useptr == baseptr)
1162                         break;
1163
1164                 gvar->mm.mmrover = gvar->mm.mmrover->next;
1165
1166                 if(!gvar->mm.mmrover)
1167                         gvar->mm.mmrover = gvar->mm.mmhead;
1168                 else if(gvar->mm.mmrover == start)
1169                 {
1170                         Quit("MM_SetLock: Block not found!");
1171                         //return;
1172                 }
1173
1174         } while(1);
1175
1176         gvar->mm.mmrover->attributes &= ~LOCKBIT;
1177         gvar->mm.mmrover->attributes |= locked*LOCKBIT;
1178 }
1179
1180 //==========================================================================
1181
1182 /*
1183 =====================
1184 =
1185 = MM_SortMem
1186 =
1187 = Throws out all purgable stuff and compresses movable blocks
1188 =
1189 =====================
1190 */
1191
1192 void MM_SortMem(global_game_variables_t *gvar)
1193 {
1194         //huge mmblocktype huge *scan,huge *last,huge *next;
1195         mmblocktype far *scan,far *last,far *next;
1196         unsigned        start,length,source,dest,oldborder;
1197         int                     playing;
1198
1199         //
1200         // lock down a currently playing sound
1201         //
1202 /*++++  playing = SD_SoundPlaying ();
1203         if(playing)
1204         {
1205                 switch (SoundMode)
1206                 {
1207                 case sdm_PC:
1208                         playing += STARTPCSOUNDS;
1209                         break;
1210                 case sdm_AdLib:
1211                         playing += STARTADLIBSOUNDS;
1212                         break;
1213                 }
1214                 MM_SetLock(&(memptr)audiosegs[playing],true);
1215         }
1216
1217
1218         SD_StopSound();*/
1219 //      oldborder = bordercolor;
1220 //      VW_ColorBorder (15);
1221
1222         if(beforesort)
1223                 beforesort();
1224
1225         scan = gvar->mm.mmhead;
1226
1227         last = NULL;            // shut up compiler warning
1228
1229         while(scan)
1230         {
1231                 if(scan->attributes & LOCKBIT)
1232                 {
1233                 //
1234                 // block is locked, so try to pile later blocks right after it
1235                 //
1236                         start = scan->start + scan->length;
1237                 }
1238                 else
1239                 {
1240                         if(scan->attributes & PURGEBITS)
1241                         {
1242                         //
1243                         // throw out the purgable block
1244                         //
1245                                 next = scan->next;
1246                                 FREEBLOCK(scan);
1247                                 //MM_FreeBlock(scan, gvar);
1248                                 last->next = next;
1249                                 scan = next;
1250                                 continue;
1251                         }
1252                         else
1253                         {
1254                         //
1255                         // push the non purgable block on top of the last moved block
1256                         //
1257                                 if(scan->start != start)
1258                                 {
1259                                         length = scan->length;
1260                                         source = scan->start;
1261                                         dest = start;
1262                                         while(length > 0xf00)
1263                                         {
1264                                                 movedata(source,0,dest,0,0xf00*16);
1265                                                 length -= 0xf00;
1266                                                 source += 0xf00;
1267                                                 dest += 0xf00;
1268                                         }
1269                                         movedata(source,0,dest,0,length*16);
1270
1271                                         scan->start = start;
1272                                         *(unsigned *)scan->useptr = start;
1273                                 }
1274                                 start = scan->start + scan->length;
1275                         }
1276                 }
1277
1278                 last = scan;
1279                 scan = scan->next;              // go to next block
1280         }
1281
1282         gvar->mm.mmrover = gvar->mm.mmhead;
1283
1284         if(aftersort)
1285                 aftersort();
1286
1287 //      VW_ColorBorder (oldborder);
1288
1289 /*++++  if(playing)
1290                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
1291 }
1292
1293 //==========================================================================
1294
1295 /*
1296 =====================
1297 =
1298 = MM_ShowMemory
1299 =
1300 =====================
1301 */
1302
1303 void MM_ShowMemory(global_game_variables_t *gvar)
1304 {
1305         //huge mmblocktype huge *scan;
1306         mmblocktype far *scan;
1307         word temp;
1308         sdword  end,owner;
1309         //word chx,chy;
1310         word w;
1311         //dword wwww;
1312         byte    scratch[160],scratch0[4096],scratch1[160],str[16];
1313         //byte d = '#';
1314 //****  VW_SetDefaultColors();
1315 //****  VW_SetLineWidth(40);
1316 //++++mh        temp = bufferofs;
1317 //++++mh        bufferofs = 0;
1318 //****  VW_SetScreen (0,0);
1319         scan = gvar->mm.mmhead;
1320         end = -1;
1321
1322         CA_OpenDebug (gvar);
1323         w=0;
1324         while(scan)
1325         {
1326                 strcpy(scratch, AARESET);
1327                 if(scan->attributes & PURGEBITS)
1328                         strcpy(scratch0, AAMAGENTA);            // dark purple = purgable
1329                 else
1330                         strcpy(scratch0, AABLUE);               // medium blue = non purgable
1331                 if(scan->attributes & LOCKBIT)
1332                         strcpy(scratch0, AARED);                // red = locked
1333                 if(scan->start<=end)
1334                 {
1335                         printf("\nend==%d\n\n", end);
1336                         strcat(scratch, "MM_ShowMemory: Memory block order currupted!\n");
1337                         strcat(scratch, "End's Size: ");
1338                         ultoa (end,str,10);
1339                         strcat (scratch,str);
1340                         strcat(scratch, "\nscan->start's Size: ");
1341                         ultoa (scan->start,str,10);
1342                         strcat (scratch,str);
1343                         write(gvar->handle.debughandle,scratch,strlen(scratch));
1344                         //modexprint(&page, chx, chy, 1, 0, 24, "\nMM_ShowMemory: Memory block order currupted!\n");
1345                         break;
1346                 }
1347                 end = scan->start+(scan->length)-1;
1348 //++++          chy = scan->start/320;
1349 //++++          chx = scan->start%320;
1350                                 //modexhlin(page, scan->start, (unsigned)end, chy, color);
1351                                 //for(chx=scan->start;chx+4>=(word)end;chx+=4)
1352                                 //{
1353 //++++                                  modexClearRegion(page, chx, chy, 4, 4, color);
1354                                 //}
1355 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1356                 for(w=(scan->start)/80;w<=end/80;w++)
1357                 {
1358                         //printf("+     %u      %lu\n", w, scan->length);
1359                         strcat(scratch0, "+");
1360                 }
1361                 //++==++==optional strcat(scratch0, AARESET); strcat(scratch0, AAGREY); strcat(scratch0,"_");
1362 //++++          VW_Plot(scan->start,0,15);
1363 //++++                          modexClearRegion(page, chx, chy, 4, 4, 15);
1364 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1365
1366                 //wwww=(dword)(scan->next->start)-(dword)scan->start;
1367                 //wwww=(dword)scan->start+(dword)(scan->next->start);
1368                 if (scan->next && scan->next->start >= end+1)
1369                 {
1370                         strcat(scratch0, AARESET);
1371                         //++==++==optional strcat(scratch0, "\n");
1372                         strcat(scratch0,AAGREEN);
1373                         for(w=(end+1)/80;w<=((scan->next->start-scan->start)/80);w++)
1374                         //for(w=(wwww)/80;w<=((end+1)/80);w++)
1375                         //for(w=(end+1)/80;w<=((wwww)/80);w++)
1376                         {
1377                                 //printf("0     %x      %u      %lu\n", scan->next->start, w, scan->length);
1378                                 strcat(scratch0,"0");
1379                         }
1380                         //printf("==================\n");
1381                         //printf("w=%u  wwww=%lu        start=%04x      next=%04x       end=%lu\n", w/80, wwww/80, scan->start, (scan->next->start), end+1);
1382                         //printf("==================\n");
1383                         strcat(scratch0, "\n");
1384                         //getch();
1385                 }/*else {//if(scan->next->start <= scan->start){
1386                         scan->next->start=scan->start+0x1000;
1387                         wwww=(dword)(scan->next->start)-(dword)scan->start;
1388                         strcat(scratch0, AARESET);
1389                         strcat(scratch0, "\n");
1390                         strcat(scratch0,AAGREEN);
1391                         for(w=(end+1);w<=(0x1000/80);w++)
1392                         {
1393                                 //printf("0     %x      %x      %u\n", scan->start, w);
1394                                 strcat(scratch0,"0");
1395                         }
1396                         printf("================\n");
1397                         printf("w=%x    start=%x        next=%x end=%u  %lu\n", w, scan->start, (scan->next->start), end+1, wwww);
1398                         printf("================\n");
1399                         getch();
1400                 }*/
1401                 strcat(scratch0, AARESET);
1402                 //strcat(scratch0,"\n");
1403                         //for(chx=scan->next->start;chx+4>=(word)end+1;chx+=4)
1404                         //{
1405 //                              chx+=scan->next->start;
1406 //                              modexClearRegion(page, chx, chy, 4, 4, 2);
1407                         //}
1408                                         //modexhlin(page, end+1,scan->next->start, chy, 0);
1409 /*              y = scan->start/320;
1410                 x = scan->start%320;
1411                 VW_Hlin(x,x+end,y,color);
1412                 VW_Plot(x,y,15);*/
1413 //++++                  VW_Hlin(x+end+1,x+(scan->next->start-scan->start),y,0); // black = free
1414                 strcat(scratch,"Seg:");
1415                 ultoa (scan->start,str,16);
1416                 strcat (scratch,str);
1417                 strcat (scratch,"\tSize:");
1418                 ultoa ((unsigned)scan->length,str,10);
1419                 strcat (scratch,str);
1420                 strcat (scratch,"\tOwner:0x");
1421                 owner = (unsigned)scan->useptr;
1422                 ultoa (owner,str,16);
1423                 strcat (scratch,str);
1424                 strcat (scratch,"\n");
1425                 write(gvar->handle.debughandle,scratch,strlen(scratch));
1426                 write(gvar->handle.debughandle,scratch0,strlen(scratch0));
1427 //modexprint(page, chx, chy, 1, 0, 24, &scratch);
1428 //++++chy+=4;
1429 //fprintf(stdout, "%s", scratch);
1430
1431                 scan = scan->next;
1432         }
1433         /*strcpy(scratch1, AARESET);
1434         strcat(scratch1, "========================================\n");
1435         strcat(scratch1, "near=  ");
1436         ultoa (*(gvar->mm.nearheap),str,10);
1437         strcat (scratch1,str);
1438         strcat(scratch1, "      far= ");
1439         ultoa (*(gvar->mm.farheap),str,10);
1440         strcat (scratch1,str);
1441         strcat(scratch1, "\n");
1442         //strcat(scratch1, "&near=      %Fp ", &(gvar->mm.nearheap));
1443         //strcat(scratch1, "&far=       %Fp", &(gvar->mm.farheap));
1444         //strcat(scratch1, "\n");
1445         strcat(scratch1, "========================================\n");
1446         write(gvar->handle.debughandle,scratch1,strlen(scratch1));*/
1447
1448
1449         CA_CloseDebug (gvar);
1450
1451 //++++mh        IN_Ack();
1452 //****  VW_SetLineWidth(64);
1453 //++++mh        bufferofs = temp;
1454 }
1455
1456 //==========================================================================
1457
1458 /*
1459 =====================
1460 =
1461 = MM_DumpData
1462 =
1463 =====================
1464 */
1465
1466 void MM_DumpData(global_game_variables_t *gvar)
1467 {
1468         //huge mmblocktype huge *scan,huge *best;
1469         mmblocktype far *scan,far *best;
1470         long    lowest,oldlowest;
1471         word    owner;
1472         byte    lock,purge;
1473         FILE    *dumpfile;
1474
1475         free(gvar->mm.nearheap);
1476 #ifdef __BORLANDC__
1477                 dumpfile = fopen ("mmdump.16b","w");
1478 #endif
1479 #ifdef __WATCOMC__
1480                 dumpfile = fopen ("mmdump.16w","w");
1481 #endif
1482         if (!dumpfile){
1483                 printf("MM_DumpData: Couldn't open MMDUMP.16!\n");
1484                 return;
1485         }
1486
1487         lowest = -1;
1488         do
1489         {
1490                 oldlowest = lowest;
1491                 lowest = 0xffff;
1492
1493                 scan = gvar->mm.mmhead;
1494                 while (scan)
1495                 {
1496                         owner = (unsigned)scan->useptr;
1497
1498                         if (owner && owner<lowest && owner > oldlowest)
1499                         {
1500                                 best = scan;
1501                                 lowest = owner;
1502                         }
1503
1504                         scan = scan->next;
1505                 }
1506
1507                 if (lowest != 0xffff)
1508                 {
1509                         if (best->attributes & PURGEBITS)
1510                                 purge = 'P';
1511                         else
1512                                 purge = '-';
1513                         if (best->attributes & LOCKBIT)
1514                                 lock = 'L';
1515                         else
1516                                 lock = '-';
1517                         fprintf (dumpfile,"0x%p (%c%c) = %u\n"
1518                         ,(unsigned)lowest,lock,purge,best->length);
1519                 }
1520
1521         } while (lowest != 0xffff);
1522
1523         fclose(dumpfile);
1524         printf("MMDUMP.16 created.\n");
1525 }
1526
1527 //==========================================================================
1528
1529
1530 /*
1531 ======================
1532 =
1533 = MM_UnusedMemory
1534 =
1535 = Returns the total free space without purging
1536 =
1537 ======================
1538 */
1539
1540 dword MM_UnusedMemory(global_game_variables_t *gvar)
1541 {
1542         dword free;
1543         //huge mmblocktype huge *scan;
1544         mmblocktype far *scan;
1545
1546         free = 0;
1547         scan = gvar->mm.mmhead;
1548
1549         while(scan->next)
1550         {
1551                 free += scan->next->start - (scan->start + scan->length);
1552                 scan = scan->next;
1553         }
1554
1555         return free*16lu;
1556 //      return free;
1557 }
1558
1559 //==========================================================================
1560
1561
1562 /*
1563 ======================
1564 =
1565 = MM_TotalFree
1566 =
1567 = Returns the total free space with purging
1568 =
1569 ======================
1570 */
1571
1572 dword MM_TotalFree(global_game_variables_t *gvar)
1573 {
1574         dword free;
1575         //huge mmblocktype huge *scan;
1576         mmblocktype far *scan;
1577
1578         free = 0;
1579         scan = gvar->mm.mmhead;
1580
1581         while(scan->next)
1582         {
1583                 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1584                         free += scan->length;
1585                 free += scan->next->start - (scan->start + scan->length);
1586                 scan = scan->next;
1587         }
1588
1589         return free*16lu;
1590 //      return free;
1591 }
1592
1593 //==========================================================================
1594
1595 /*
1596 =====================
1597 =
1598 = MM_Report
1599 =
1600 =====================
1601 */
1602
1603 void MM_Report_(global_game_variables_t *gvar)
1604 {
1605         printf("========================================\n");
1606         printf("                MM_Report\n");
1607         printf("========================================\n");
1608         if(MML_CheckForEMS())
1609         {
1610                 printf("        LIMEMS\n");
1611                 printf("                EMM v%x.%x available\n", gvar->mm.EMSVer>>4,gvar->mm.EMSVer&0x0F);
1612                 printf("                totalEMSpages:  %u      ", gvar->mm.totalEMSpages); printf("freeEMSpages:       %u\n", gvar->mm.freeEMSpages);
1613                 printf("                EMSpageframe:   %x\n", gvar->mm.EMSpageframe);
1614         }
1615         if(MML_CheckForXMS(gvar))
1616         {
1617                 printf("        XMS\n");
1618                 printf("                XMSaddr:        %X\n", *XMSaddr);
1619         }
1620         printf("near:   %lu     ", gvar->mmi.nearheap); printf("far:    %lu\n", gvar->mmi.farheap); if(MML_CheckForEMS())
1621         printf("EMSmem: %lu     ", gvar->mmi.EMSmem); if(MML_CheckForXMS(gvar)) printf("XMSmem: %lu", gvar->mmi.XMSmem); printf("\n");
1622         //printf("mainmem:      %lu\n", gvar->mmi.mainmem);
1623         printf("Total convmem:  %lu     ", gvar->mmi.mainmem); printf("TotalFree:       %lu     ", MM_TotalFree(gvar)); printf("TotalUsed:      %lu\n", gvar->mmi.mainmem+gvar->mmi.EMSmem+gvar->mmi.XMSmem+gvar->mmi.XMSmem);
1624         printf("                        UnusedMemory:   %lu\n", MM_UnusedMemory(gvar));
1625 }
1626
1627 //==========================================================================
1628
1629 /*
1630 =====================
1631 =
1632 = MM_EMSerr
1633 =
1634 =====================
1635 */
1636
1637 void MM_EMSerr(byte *stri, byte err)
1638 {
1639         //Returns a text string describing the error code in EMS.Error.
1640         switch(err)
1641         {
1642                 case 0x0:
1643                         strcat(stri, "successful");
1644                 break;
1645                 case 0x80:
1646                         strcat(stri, "internal error");
1647                 break;
1648                 case 0x81:
1649                         strcat(stri, "hardware malfunction");
1650                 break;
1651                 case 0x82:
1652                         strcat(stri, "busy .. retry later");
1653                 break;
1654                 case 0x83:
1655                         strcat(stri, "invalid handle");
1656                 break;
1657                 case 0x84:
1658                         strcat(stri, "undefined function requested by application");
1659                 break;
1660                 case 0x85:
1661                         strcat(stri, "no more handles available");
1662                 break;
1663                 case 0x86:
1664                         strcat(stri, "error in save or restore of mapping context");
1665                 break;
1666                 case 0x87:
1667                         strcat(stri, "insufficient memory pages in system");
1668                 break;
1669                 case 0x88:
1670                         strcat(stri, "insufficient memory pages available");
1671                 break;
1672                 case 0x89:
1673                         strcat(stri, "zero pages requested");
1674                 break;
1675                 case 0x8A:
1676                         strcat(stri, "invalid logical page number encountered");
1677                 break;
1678                 case 0x8B:
1679                         strcat(stri, "invalid physical page number encountered");
1680                 break;
1681                 case 0x8C:
1682                         strcat(stri, "page-mapping hardware state save area is full");
1683                 break;
1684                 case 0x8D:
1685                         strcat(stri, "save of mapping context failed");
1686                 break;
1687                 case 0x8E:
1688                         strcat(stri, "restore of mapping context failed");
1689                 break;
1690                 case 0x8F:
1691                         strcat(stri, "undefined subfunction");
1692                 break;
1693                 case 0x90:
1694                         strcat(stri, "undefined attribute type");
1695                 break;
1696                 case 0x91:
1697                         strcat(stri, "feature not supported");
1698                 break;
1699                 case 0x92:
1700                         strcat(stri, "successful, but a portion of the source region has been overwritten");
1701                 break;
1702                 case 0x93:
1703                         strcat(stri, "length of source or destination region exceeds length of region allocated to either source or destination handle");
1704                 break;
1705                 case 0x94:
1706                         strcat(stri, "conventional and expanded memory regions overlap");
1707                 break;
1708                 case 0x95:
1709                         strcat(stri, "offset within logical page exceeds size of logical page");
1710                 break;
1711                 case 0x96:
1712                         strcat(stri, "region length exceeds 1 MB");
1713                 break;
1714                 case 0x97:
1715                         strcat(stri, "source and destination EMS regions have same handle and overlap");
1716                 break;
1717                 case 0x98:
1718                         strcat(stri, "memory source or destination type undefined");
1719                 break;
1720                 case 0x9A:
1721                         strcat(stri, "specified alternate map register or DMA register set not supported");
1722                 break;
1723                 case 0x9B:
1724                         strcat(stri, "all alternate map register or DMA register sets currently allocated");
1725                 break;
1726                 case 0x9C:
1727                         strcat(stri, "alternate map register or DMA register sets not supported");
1728                 break;
1729                 case 0x9D:
1730                         strcat(stri, "undefined or unallocated alternate map register or DMA register set");
1731                 break;
1732                 case 0x9E:
1733                         strcat(stri, "dedicated DMA channels not supported");
1734                 break;
1735                 case 0x9F:
1736                         strcat(stri, "specified dedicated DMA channel not supported");
1737                 break;
1738                 case 0xA0:
1739                         strcat(stri, "no such handle name");
1740                 break;
1741                 case 0xA1:
1742                         strcat(stri, "a handle found had no name, or duplicate handle name");
1743                 break;
1744                 case 0xA2:
1745                         strcat(stri, "attempted to wrap around 1M conventional address space");
1746                 break;
1747                 case 0xA3:
1748                         strcat(stri, "source array corrupted");
1749                 break;
1750                 case 0xA4:
1751                         strcat(stri, "operating system denied access");
1752                 break;
1753                 default:
1754                         strcat(stri, "undefined error");
1755         }
1756 }
1757
1758 //==========================================================================
1759
1760 /*
1761 =====================
1762 =
1763 = MM_BombOnError
1764 =
1765 =====================
1766 */
1767
1768 void MM_BombOnError(boolean bomb, global_game_variables_t *gvar)
1769 {
1770         gvar->mm.bombonerror = bomb;
1771 }
1772
1773 /*void MM_GetNewBlock(global_game_variables_t *gvar)
1774 {
1775         if(!gvar->mm.mmfree)
1776                 MML_ClearBlock(gvar);
1777         gvar->mm.mmnew=gvar->mm.mmfree;
1778         gvar->mm.mmfree=gvar->mm.mmfree->next;
1779         if(!(gvar->mm.mmnew=gvar->mm.mmfree))
1780         {
1781                 printf("MM_GETNEWBLOCK: No free blocks!\n");
1782                 return;
1783         }
1784         gvar->mm.mmfree=gvar->mm.mmfree->next;
1785 }
1786
1787 void MM_FreeBlock(mmblocktype *x, global_game_variables_t *gvar)
1788 {
1789         x->useptr=NULL;
1790         x->next=gvar->mm.mmfree;
1791         gvar->mm.mmfree=x;
1792 }*/
1793
1794 /*void MM_seguin(void)
1795 {
1796         __asm {
1797                 push    ds
1798                 mov     ax,ds
1799                 inc             ax
1800                 mov     ds,ax
1801         }
1802 }
1803
1804 void MM_segude(void)
1805 {
1806         __asm {
1807                 pop ds
1808         }
1809 }*/
1810
1811 /*
1812 pull data from far and put it into ds var
1813 mov ax,es:si
1814 mov x,ax
1815 */
1816 /*
1817 ss stack segment
1818 sp top of stack
1819 bp bottem of stack
1820 */