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         __asm {
  93                 mov     dx,OFFSET emmname       //fix by andrius4669
  94                 mov     ax,0x3d00
  95                 int     0x21            // try to open EMMXXXX0 device
  96                 jc      error
  97
  98                 mov     bx,ax
  99                 mov     ax,0x4400
 100
 101                 int     0x21            // get device info
 102                 jc      error
 103
 104                 and     dx,0x80
 105                 jz      error
 106
 107                 mov     ax,0x4407
 108
 109                 int     0x21            // get status
 110                 jc      error
 111                 or      al,al
 112                 jz      error
 113
 114                 mov     ah,0x3e
 115                 int     0x21            // close handle
 116                 jc      error
 117                 //
 118                 // EMS is good
 119                 //
 120                 mov     emmcfems,1
 121                 jmp End
 122 #ifdef __BORLANDC__
 123         }
 124 #endif
 125                 error:
 126 #ifdef __BORLANDC__
 127         __asm {
 128 #endif
 129                 //
 130                 // EMS is bad
 131                 //
 132                 mov     emmcfems,0
 133 #ifdef __BORLANDC__
 134         }
 135 #endif
 136                 End:
 137 #ifdef __WATCOMC__
 138         }
 139 #endif
 140         return(emmcfems);
 141 }
 142
 143 #ifndef __16_PM__
 144 /*
 145 ======================
 146 =
 147 = MML_SetupEMS
 148 =
 149 =======================
 150 */
 151
 152 byte MML_SetupEMS(global_game_variables_t *gvar)
 153 {
 154         byte    str[160];
 155         byte    err;
 156         boolean errorflag=false;
 157
 158         unsigned int EMSVer = 0;
 159         //byte  EMS_status;
 160         unsigned        totalEMSpages,freeEMSpages,EMSPageFrame,EMSpagesmapped,EMSHandle;
 161         totalEMSpages = freeEMSpages = EMSPageFrame = EMSpagesmapped = 0;
 162
 163         __asm {
 164                 mov     ah,EMS_STATUS
 165                 int     EMS_INT                                         // make sure EMS hardware is present
 166                 or      ah,ah
 167                 //mov   [EMS_status],ah
 168                 jnz     error
 169
 170                 mov     ah,EMS_VERSION
 171                 int     EMS_INT
 172                 or      ah,ah
 173                 jnz     error
 174                 mov     [EMSVer],ax                             //      set EMSVer
 175                 cmp     al,0x32                                         // only work on ems 3.2 or greater
 176                 jb      error
 177
 178                 mov     ah,EMS_GETFRAME
 179                 int     EMS_INT                                         // find the page frame address
 180                 or      ah,ah
 181                 jnz     error
 182                 mov     [EMSPageFrame],bx
 183
 184                 mov     ah,EMS_GETPAGES
 185                 int     EMS_INT                                         // find out how much EMS is there
 186                 or      ah,ah
 187                 jnz     error
 188                 mov     [totalEMSpages],dx
 189                 mov     [freeEMSpages],bx
 190                 or      bx,bx
 191                 jz      noEMS                                           // no EMS at all to allocate
 192                                                                                         //EXPAND DONG!!!!
 193                 cmp     [EMSVer],0x40
 194                 jb      low
 195                 cmp     bx,[freeEMSpages]
 196                 jle     getpages
 197                 mov     bx,[freeEMSpages]
 198                 jmp     getpages
 199 #ifdef __BORLANDC__
 200         }
 201 #endif
 202         low:
 203 #ifdef __BORLANDC__
 204         __asm {
 205 #endif
 206                 cmp     bx,4
 207                 jle     getpages                                        // there is only 1,2,3,or 4 pages
 208                 mov     bx,4                                            // we can't use more than 4 pages
 209 #ifdef __BORLANDC__
 210         }
 211 #endif
 212         getpages:
 213 #ifdef __BORLANDC__
 214         __asm {
 215 #endif
 216                 mov     [EMSpagesmapped],bx
 217                 mov     ah,EMS_ALLOCPAGES                       // allocate up to 64k of EMS
 218                 int     EMS_INT
 219                 or      ah,ah
 220                 jnz     error
 221                 mov     [EMSHandle],dx
 222                 jmp End
 223 #ifdef __BORLANDC__
 224         }
 225 #endif
 226         error:
 227 #ifdef __BORLANDC__
 228         __asm {
 229 #endif
 230                 mov     err,ah
 231                 mov     errorflag,1
 232                 jmp End
 233 #ifdef __BORLANDC__
 234         }
 235 #endif
 236 noEMS:
 237 End:
 238 #ifdef __WATCOMC__
 239         }
 240 #endif
 241         if(errorflag==true)
 242         {
 243                 strcpy(str,"MM_SetupEMS: EMS error ");
 244                 MM_EMSerr(str, err);
 245                 printf("%s\n",str);
 246                 return err;
 247         }
 248         gvar->mm.totalEMSpages=totalEMSpages;
 249         gvar->mm.freeEMSpages=freeEMSpages;
 250         gvar->mm.EMSPageFrame=EMSPageFrame;
 251         gvar->mm.EMSpagesmapped=EMSpagesmapped;
 252         gvar->mm.EMSHandle=EMSHandle;
 253         gvar->mm.EMSVer=EMSVer;
 254         return 0;
 255 }
 256
 257
 258 /*
 259 ======================
 260 =
 261 = MML_ShutdownEMS
 262 =
 263 =======================
 264 */
 265
 266 void MML_ShutdownEMS(global_game_variables_t *gvar)
 267 {
 268         boolean errorflag=false;
 269         unsigned EMSHandle=gvar->mm.EMSHandle;
 270
 271         if(!EMSHandle)
 272                 return;
 273         __asm {
 274                 mov     ah,EMS_FREEPAGES
 275                 mov     dx,[EMSHandle]
 276                 int     EMS_INT
 277                 or      ah,ah
 278                 jz      ok
 279                 mov     errorflag,1
 280 #ifdef __BORLANDC__
 281         }
 282 #endif
 283                 ok:
 284 #ifdef __WATCOMC__
 285         }
 286 #endif
 287         if(errorflag==true)
 288                 Quit("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(global_game_variables_t *gvar)
 304 {
 305         byte    str[160];
 306         unsigned        EMSHandle;
 307         byte err;
 308         boolean errorflag=false;
 309         int     i;
 310         EMSHandle=gvar->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         gvar->mmi.EMSmem = (i)*0x4000lu;
 348         return 0;
 349 }
 350
 351 byte MM_MapXEMS(global_game_variables_t *gvar)
 352 {
 353 //SUB EMS.MapXPages (PhysicalStart, LogicalStart, NumPages, Handle)
 354
 355         //Maps up to 4 logical EMS pages to physical pages in the page frame, where:
 356         //PhysicalStart = Physical page first logical page is mapped to
 357         //LogicalStart  = First logical page to map
 358         //NumPages      = Number of pages to map (1 to 4)
 359         //Handle        = EMS handle logical pages are allocated to
 360
 361   /*//Create a buffer containing the page information
 362 //  FOR x = 0 TO NumPages - 1
 363 //    MapInfo$ = MapInfo$ + MKI$(LogicalStart + x) + MKI$(PhysicalStart + x)
 364 //  NEXT*/
 365
 366 //  Regs.ax = 0x5000                           //Map the pages in the buffer
 367 //  Regs.cx = NumPages                         //to the pageframe
 368 //  Regs.dx = Handle
 369 //  Regs.ds = VARSEG(MapInfo$)
 370 //  Regs.si = SADD(MapInfo$)
 371 //  InterruptX 0x67, Regs, Regs
 372 //      EMS.Error = (Regs.ax AND 0xFF00&) \ 0x100  //Store the status code
 373
 374 //END SUB
 375         byte    str[160];
 376         byte err;
 377         word    EMSHandle;
 378         boolean errorflag=false;
 379         int     i;
 380         EMSHandle=gvar->mm.EMSHandle;
 381
 382         if(gvar->mm.EMSVer<0x40)
 383                 return 5;
 384
 385         for (i=0;i<MAPPAGES;i++)
 386         {
 387                 __asm {
 388                         mov     ah,EMS_MAPXPAGE
 389                         mov     cx,[i]                  // logical page
 390                         mov     al,bl                   // physical page
 391                         mov     dx,[EMSHandle]  // handle
 392                         int     EMS_INT
 393                         or      ah,ah
 394                         jnz     error
 395                         jmp End
 396 #ifdef __BORLANDC__
 397                 }
 398 #endif
 399                         error:
 400 #ifdef __BORLANDC__
 401                 __asm {
 402 #endif
 403                         mov     err,ah
 404                         mov     errorflag,1
 405 #ifdef __BORLANDC__
 406                 }
 407 #endif
 408                         End:
 409 #ifdef __WATCOMC__
 410                 }
 411 #endif
 412                 if(errorflag==true)
 413                 {
 414                         //strcpy(str,"MM_MapXEMS: EMS error 0x");
 415                         strcpy(str,"MM_MapXEMS: EMS error ");
 416                         //itoa(err,str2,16);
 417                         MM_EMSerr(str, err);
 418                         printf("%s\n",str);
 419                         //printf("%s%x\n",str, err);
 420                         //printf("FACK! %x\n", err);
 421                         return err;
 422                 }
 423         }
 424         gvar->mmi.EMSmem = (i)*0x4000lu;
 425         return 0;
 426 }
 427 #endif
 428 //==========================================================================
 429
 430 /*
 431 ======================
 432 =
 433 = MML_CheckForXMS
 434 =
 435 = Check for XMM driver
 436 =
 437 =======================
 438 */
 439
 440 boolean MML_CheckForXMS(void)
 441 {
 442         boolean errorflag=false;
 443
 444         __asm {
 445                 mov     ax,0x4300
 446                 int     0x2f                            // query status of installed diver
 447                 cmp     al,0x80
 448                 je      good
 449                 mov     errorflag,1
 450 #ifdef __BORLANDC__
 451         }
 452 #endif
 453                 good:
 454 #ifdef __WATCOMC__
 455         }
 456 #endif
 457         if(errorflag==true) return false;
 458         else return true;
 459 }
 460
 461 #ifndef __16_PM__
 462 /*
 463 ======================
 464 =
 465 = MML_SetupXMS
 466 =
 467 = Try to allocate all upper memory block
 468 =
 469 =======================
 470 */
 471
 472 void MML_SetupXMS(global_game_variables_t *gvar)
 473 {
 474         word    base,size;
 475
 476
 477         __asm {
 478                 mov     ax,0x4310
 479                 int     0x2f
 480                 mov     [WORD PTR XMSaddr],bx
 481                 mov     [WORD PTR XMSaddr+2],es         // function pointer to XMS driver
 482         }
 483 getmemory:
 484         __asm {
 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, gvar);
 517         gvar->mmi.XMSmem += size*16;
 518         gvar->mm.UMBbase[gvar->mm.numUMBs] = base;
 519         gvar->mm.numUMBs++;
 520         if(gvar->mm.numUMBs < MAXUMBS)
 521                 goto getmemory;
 522 }
 523
 524
 525 /*
 526 ======================
 527 =
 528 = MML_ShutdownXMS
 529 =
 530 ======================
 531 */
 532
 533 void MML_ShutdownXMS(global_game_variables_t *gvar)
 534 {
 535         int     i;
 536         unsigned        base;
 537
 538         for (i=0;i<gvar->mm.numUMBs;i++)
 539         {
 540                 base = gvar->mm.UMBbase[i];
 541                 __asm {
 542                         mov     ah,XMS_FREEUMB
 543                         mov     dx,[base]
 544                         call    [DWORD PTR XMSaddr]
 545                 }
 546         }
 547 }
 548 #endif
 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, global_game_variables_t *gvar)
 564 {
 565         //huge mmblocktype huge *scan,huge *last;
 566         word            segm=1;
 567         word    oldend;
 568         dword           segmlen;
 569         dword           extra;
 570
 571         scan = last = gvar->mm.mmhead;
 572         gvar->mm.mmrover = gvar->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         //++++emsver stuff!
 592         if(segm>1)/// || extra>=0x10000lu)
 593         //if(extra>0xfffflu)
 594         {
 595                 scan->blob=segm;
 596
 597                 //MML_UseSpace(segstart, seglength, gvar);
 598
 599                 printf("MML_UseSpace: Segment spans two blocks!\n");
 600         //}
 601         printf("segm=%u         ", segm);
 602         printf("ex=%lu  ", extra);
 603         printf("old=%u  ", oldend);
 604         printf("start+seglen=%lu\n", segstart+seglength);
 605         printf("segsta=%x       ", segstart);
 606         printf("len=%lu ", scan->length);
 607         printf("seglen=%lu      ", seglength);
 608         printf("segmlen=%lu\n", segmlen);
 609         }
 610 //++++todo: linked list of segment!
 611         if(segstart == scan->start)
 612         {
 613                 last->next = scan->next;                        // unlink block
 614                 FREEBLOCK(scan);
 615                 scan = last;
 616         }
 617         else
 618                 scan->length = segstart-scan->start;    // shorten block
 619
 620         if(extra > 0)
 621         {
 622                 GETNEWBLOCK;
 623                 gvar->mm.mmnew->useptr = NULL;
 624
 625                 gvar->mm.mmnew->next = scan->next;
 626                 scan->next = gvar->mm.mmnew;
 627                 gvar->mm.mmnew->start = segstart+seglength;
 628                 gvar->mm.mmnew->length = extra;
 629                 gvar->mm.mmnew->attributes = LOCKBIT;
 630         }//else if(segm>0) goto segu;
 631
 632 }*/
 633 void MML_UseSpace(word segstart, dword seglength, global_game_variables_t *gvar)
 634 {
 635         mmblocktype far *scan,far *last;
 636         word    oldend;
 637         sdword          extra;
 638         //word segm=1;
 639
 640         scan = last = gvar->mm.mmhead;
 641         gvar->mm.mmrover = gvar->mm.mmhead;             // reset rover to start of memory
 642
 643 //
 644 // search for the block that contains the range of segments
 645 //
 646         while (scan->start+scan->length < segstart)
 647         {
 648                 last = scan;
 649                 scan = scan->next;
 650         }
 651
 652 //
 653 // find out how many blocks it spans!
 654 //
 655         /*for(;seglength>=0x10000;seglength-=0xFFFF)
 656         {
 657                 //printf("      seglen=%lu\n", segmlen);
 658                 segm++;
 659         }*/
 660
 661 //
 662 // take the given range out of the block
 663 //
 664         oldend = scan->start + scan->length;
 665         extra = oldend - (segstart+((unsigned)seglength));
 666         if (extra < 0)
 667         {
 668                 printf("========================================\n");
 669                 printf("start=%x        ", scan->start);
 670                 printf("old=%u  ", oldend);
 671                 printf("start+seglen=%lu\n", segstart+seglength);
 672                 printf("segsta=%x       ", segstart);
 673                 printf("len=%lu ", scan->length);
 674                 printf("seglen=%lu      ", seglength);
 675                 printf("\n");
 676                 printf("MML_UseSpace: Segment spans two blocks! %d\n", extra);
 677                 printf("========================================\n");
 678                 //return;
 679         }
 680
 681         if (segstart == scan->start)
 682         {
 683                 last->next = scan->next;                        // unlink block
 684                 FREEBLOCK(scan);
 685                 scan = last;
 686         }
 687         else
 688                 scan->length = segstart-scan->start;    // shorten block
 689
 690         if (extra > 0)
 691         {
 692                 GETNEWBLOCK;
 693                 gvar->mm.mmnew->useptr = NULL;
 694
 695                 gvar->mm.mmnew->next = scan->next;
 696                 scan->next = gvar->mm.mmnew;
 697                 gvar->mm.mmnew->start = segstart+seglength;
 698                 gvar->mm.mmnew->length = extra;
 699                 gvar->mm.mmnew->attributes = LOCKBIT;
 700         }
 701
 702 }
 703
 704 //==========================================================================
 705
 706 /*
 707 ====================
 708 =
 709 = MML_ClearBlock
 710 =
 711 = We are out of blocks, so free a purgable block
 712 =
 713 ====================
 714 */
 715
 716 void MML_ClearBlock(global_game_variables_t *gvar)
 717 {
 718         //huge mmblocktype huge *scan,huge *last;
 719         mmblocktype far *scan,far *last;
 720
 721         scan = gvar->mm.mmhead->next;
 722
 723         while(scan)
 724         {
 725                 if(!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS))
 726                 {
 727                         MM_FreePtr(scan->useptr, gvar);
 728                         return;
 729                 }
 730                 scan = scan->next;
 731         }
 732
 733         printf("MM_ClearBlock: No purgable blocks!\n");
 734 }
 735
 736
 737 //==========================================================================
 738
 739 /*
 740 ===================
 741 =
 742 = MM_Startup
 743 =
 744 = Grabs all space from turbo with malloc/farmalloc
 745 = Allocates bufferseg misc buffer
 746 =
 747 ===================
 748 */
 749
 750 void MM_Startup(global_game_variables_t *gvar)
 751 {
 752         int i;
 753         //dword length,seglength;
 754         dword length; word seglength;
 755         //huge void huge        *start;
 756         void far        *start;
 757         word    segstart;//,endfree;
 758         //memptr *peeonself;
 759
 760         if(gvar->mm.mmstarted)
 761                 MM_Shutdown(gvar);
 762
 763         gvar->mm.mmstarted = true;
 764         gvar->mm.bombonerror = true;
 765
 766 //
 767 // set up the linked list (everything in the free list;
 768 //
 769         gvar->mm.mmhead = NULL;
 770         gvar->mm.mmfree = &(gvar->mm.mmblocks[0]);
 771         for(i=0;i<MAXBLOCKS-1;i++)
 772         {
 773                 gvar->mm.mmblocks[i].next = &(gvar->mm.mmblocks[i+1]);
 774         }
 775         gvar->mm.mmblocks[i].next = NULL;
 776
 777 //
 778 // locked block of all memory until we punch out free space
 779 //
 780         GETNEWBLOCK;
 781         gvar->mm.mmhead = gvar->mm.mmnew;                               // this will allways be the first node
 782         gvar->mm.mmnew->start = 0;
 783         gvar->mm.mmnew->length = 0xffff;
 784         gvar->mm.mmnew->attributes = LOCKBIT;
 785         gvar->mm.mmnew->next = NULL;
 786         //gvar->mm.mmnew->useptr = peeonself;
 787         gvar->mm.mmrover = gvar->mm.mmhead;
 788
 789         //printf("              %x\n", peeonself);
 790         //printf("              %x\n", *peeonself);
 791 //
 792 // get all available near conventional memory segments
 793 //
 794 #ifdef __WATCOMC__
 795         _nheapgrow();
 796         length=(dword)_memavl();//(dword)GetFreeSize();
 797         //huge start = (void huge *)(gvar->mm.nearheap = _nmalloc(length));
 798         start = (void far *)(gvar->mm.nearheap = _nmalloc(length));
 799 #endif
 800 #ifdef __BORLANDC__
 801         length=coreleft();
 802         //huge start = (void huge *)(gvar->mm.nearheap = malloc(length));
 803         start = (void far *)(gvar->mm.nearheap = malloc(length));
 804 #endif
 805         length -= 16-(FP_OFF(start)&15);
 806         length -= SAVENEARHEAP;
 807         seglength = length / 16;                        // now in paragraphs
 808         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 809         MML_UseSpace(segstart,seglength, gvar);
 810         gvar->mmi.nearheap = length;
 811         //printf("start=%Fp     segstart=%x     seglen=%lu      len=%lu\n", start, segstart, seglength, length);
 812
 813 //
 814 // get all available far conventional memory segments
 815 //
 816         //printf("_FARCORELEFT                          %lu\n", _FCORELEFT);
 817 #ifdef __WATCOMC__
 818         _fheapgrow();
 819         length=_FCORELEFT;//_fcoreleft();//(dword)GetFarFreeSize();//0xffffUL*4UL;
 820 #endif
 821 #ifdef __BORLANDC__
 822         printf("farcoreleft()                           %lu\n", farcoreleft());
 823         printf("(farcoreleft()+32)-_FCORELEFT   %d\n", (sword)((farcoreleft()+32)-_FCORELEFT));
 824         length=farcoreleft();//_fcoreleft();//(dword)GetFarFreeSize();//0xffffUL*4UL;
 825 #endif
 826         start = gvar->mm.farheap = _fmalloc(length);
 827         //start = gvar->mm.farheap = halloc(length, 1);
 828         length -= 16-(FP_OFF(start)&15);
 829         length -= SAVEFARHEAP;
 830         seglength = length / 16;                        // now in paragraphs
 831         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 832         MML_UseSpace(segstart,seglength, gvar);
 833         gvar->mmi.farheap = length;
 834         //printf("start=%Fp     segstart=%x     seglen=%lu      len=%lu\n", start, segstart, seglength, length);
 835
 836         gvar->mmi.mainmem = gvar->mmi.nearheap + gvar->mmi.farheap;
 837
 838 #ifndef __16_PM__
 839         if(!dbg_debugpm) {
 840 //
 841 // detect EMS and allocate up to 64K at page frame
 842 //
 843         gvar->mmi.EMSmem = 0;
 844 //goto emsskip; //0000
 845         for(i = 1;i <
 846 #ifdef __WATCOMC__
 847         __argc
 848 #endif
 849 #ifdef __BORLANDC__
 850         _argc
 851 #endif
 852         ;i++)
 853         {
 854                 if(US_CheckParm(
 855 #ifdef __WATCOMC__
 856         __argv[i]
 857 #endif
 858 #ifdef __BORLANDC__
 859         _argv[i]
 860 #endif
 861                         ,ParmStringsexmm) == 0)
 862                         goto emsskip;                           // param NOEMS
 863         }
 864         if(MML_CheckForEMS())
 865         {
 866                 MML_SetupEMS(gvar);                                     // allocate space
 867                 //16_PM: EMS4! AND EMS 3.2 MASSIVE DATA HANDLMENT!
 868                 MML_UseSpace(gvar->mm.EMSPageFrame,(MAPPAGES)*0x4000lu, gvar);
 869                 //if(gvar->pm.emm.EMSVer<0x40)
 870                         MM_MapEMS(gvar);                                        // map in used pages
 871                 //else
 872                         //MM_MapXEMS(gvar);                                     // map in used pages
 873         }
 874
 875 //
 876 // detect XMS and get upper memory blocks
 877 //
 878 emsskip:
 879         gvar->mmi.XMSmem = 0;
 880 goto xmsskip;//0000
 881         for(i = 1;i <
 882 #ifdef __WATCOMC__
 883         __argc
 884 #endif
 885 #ifdef __BORLANDC__
 886         _argc
 887 #endif
 888         ;i++)
 889         {
 890                 if(US_CheckParm(
 891 #ifdef __WATCOMC__
 892         __argv[i]
 893 #endif
 894 #ifdef __BORLANDC__
 895         _argv[i]
 896 #endif
 897                         ,ParmStringsexmm) == 0)
 898                         goto xmsskip;                           // param NOXMS
 899         }
 900         if(MML_CheckForXMS())
 901         {
 902                 MML_SetupXMS(gvar);                                     // allocate as many UMBs as possible
 903         }
 904
 905         }
 906 #endif
 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 #ifdef __DEBUG__
 941         if(!dbg_debugpm) {
 942 #endif
 943         if(MML_CheckForEMS()){ MML_ShutdownEMS(gvar); }//printf("               EMS freed\n"); }
 944         if(MML_CheckForXMS()){ MML_ShutdownXMS(gvar); }//printf("               XMS freed\n"); }
 945 #ifdef __DEBUG__
 946         }
 947 #endif
 948 }
 949
 950 //==========================================================================
 951
 952 /*
 953 ====================
 954 =
 955 = MM_GetPtr
 956 =
 957 = Allocates an unlocked, unpurgable block
 958 =
 959 ====================
 960 */
 961
 962 void MM_GetPtr (memptr *baseptr, dword size, global_game_variables_t *gvar)
 963 {
 964         //huge mmblocktype huge *scan,huge *lastscan,huge *endscan,huge *purge,huge *next;
 965         mmblocktype far *scan,far *lastscan,far *endscan,far *purge,far *next;
 966         int                     search;
 967         unsigned        needed,startseg;
 968
 969         needed = (size+15)/16;          // convert size from bytes to paragraphs
 970
 971         GETNEWBLOCK;                            // fill in start and next after a spot is found
 972         gvar->mm.mmnew->length = needed;
 973         gvar->mm.mmnew->useptr = baseptr;
 974         //if(gvar->mm.mmnew->useptr==NULL){
 975 #ifdef __DEBUG_MM__
 976                 printf("MM_GetPtr\n");
 977                 //%04x
 978                 printf("        baseptr=%Fp     ", baseptr); printf("useptr=%Fp\n", gvar->mm.mmnew->useptr);
 979                 printf("        *baseptr=%Fp    ", *baseptr); printf("*useptr=%Fp\n", *(gvar->mm.mmnew->useptr));
 980                 printf("        &baseptr=%Fp    ", &baseptr); printf("&useptr=%Fp\n", &(gvar->mm.mmnew->useptr));
 981 #endif
 982         //exit(-5); }
 983         gvar->mm.mmnew->attributes = BASEATTRIBUTES;
 984
 985 //tryagain:
 986         for (search = 0; search<3; search++)
 987         {
 988         //
 989         // first search:        try to allocate right after the rover, then on up
 990         // second search:       search from the head pointer up to the rover
 991         // third search:        compress memory, then scan from start
 992                 if (search == 1 && gvar->mm.mmrover == gvar->mm.mmhead)
 993                         search++;
 994
 995                 switch (search)
 996                 {
 997                 case 0:
 998                         lastscan = gvar->mm.mmrover;
 999                         scan = gvar->mm.mmrover->next;
1000                         endscan = NULL;
1001                         break;
1002                 case 1:
1003                         lastscan = gvar->mm.mmhead;
1004                         scan = gvar->mm.mmhead->next;
1005                         endscan = gvar->mm.mmrover;
1006                         break;
1007                 case 2:
1008                         MM_SortMem (gvar);
1009                         lastscan = gvar->mm.mmhead;
1010                         scan = gvar->mm.mmhead->next;
1011                         endscan = NULL;
1012                         break;
1013                 }
1014
1015                 startseg = lastscan->start + lastscan->length;
1016
1017                 while (scan != endscan)
1018                 {
1019                         if (scan->start - startseg >= needed)
1020                         {
1021                         //
1022                         // got enough space between the end of lastscan and
1023                         // the start of scan, so throw out anything in the middle
1024                         // and allocate the new block
1025                         //
1026                                 purge = lastscan->next;
1027                                 lastscan->next = gvar->mm.mmnew;
1028                                 gvar->mm.mmnew->start = *(unsigned *)baseptr = startseg;
1029                                 gvar->mm.mmnew->next = scan;
1030                                 while ( purge != scan)
1031                                 {       // free the purgable block
1032                                         next = purge->next;
1033                                         FREEBLOCK(purge);
1034                                         purge = next;           // purge another if not at scan
1035                                 }
1036                                 gvar->mm.mmrover = gvar->mm.mmnew;
1037                                 return; // good allocation!
1038                         }
1039
1040                         //
1041                         // if this block is purge level zero or locked, skip past it
1042                         //
1043                         if ( (scan->attributes & LOCKBIT)
1044                                 || !(scan->attributes & PURGEBITS) )
1045                         {
1046                                 lastscan = scan;
1047                                 startseg = lastscan->start + lastscan->length;
1048                         }
1049
1050
1051                         scan=scan->next;                // look at next line
1052                 }
1053         }
1054
1055         if (gvar->mm.bombonerror)
1056         {
1057 #ifdef __WATCOMC__
1058                 //heapdump();
1059 #endif
1060                 printf(OUT_OF_MEM_MSG,(size-gvar->mmi.nearheap));
1061                 printf("for stability reasons the program will shut down! wwww\n");
1062                 MM_Shutdown(gvar);
1063                 exit(-1);
1064         }
1065         else
1066                 gvar->mm.mmerror = true;
1067 }
1068
1069 //==========================================================================
1070
1071 /*
1072 ====================
1073 =
1074 = MM_FreePtr
1075 =
1076 = Allocates an unlocked, unpurgable block
1077 =
1078 ====================
1079 */
1080
1081 void MM_FreePtr(memptr *baseptr, global_game_variables_t *gvar)
1082 {
1083         //huge mmblocktype huge *scan,huge *last;
1084         mmblocktype far *scan,far *last;
1085
1086         last = gvar->mm.mmhead;
1087         scan = last->next;
1088
1089         if(baseptr == gvar->mm.mmrover->useptr) // removed the last allocated block
1090                 gvar->mm.mmrover = gvar->mm.mmhead;
1091
1092         while(scan->useptr != baseptr && scan)
1093         {
1094                 last = scan;
1095                 scan = scan->next;
1096         }
1097
1098         if(!scan)
1099         {
1100                 printf("MM_FreePtr: Block not found!\n");
1101                 return;
1102         }
1103
1104         last->next = scan->next;
1105
1106         FREEBLOCK(scan);
1107 }
1108 //==========================================================================
1109
1110 /*
1111 =====================
1112 =
1113 = MM_SetPurge
1114 =
1115 = Sets the purge level for a block (locked blocks cannot be made purgable)
1116 =
1117 =====================
1118 */
1119
1120
1121 void MM_SetPurge(memptr *baseptr, int purge, global_game_variables_t *gvar)
1122 {
1123         //huge mmblocktype huge *start;
1124         mmblocktype far *start;
1125
1126         start = gvar->mm.mmrover;
1127
1128         do
1129         {
1130                 if(gvar->mm.mmrover->useptr == baseptr)
1131                         break;
1132
1133                 gvar->mm.mmrover = gvar->mm.mmrover->next;
1134
1135                 if(!gvar->mm.mmrover)
1136                         gvar->mm.mmrover = gvar->mm.mmhead;
1137                 else if(gvar->mm.mmrover == start)
1138                 {
1139                         Quit("MM_SetPurge: Block not found!");
1140                         //return;
1141                 }
1142
1143         } while(1);
1144
1145         gvar->mm.mmrover->attributes &= ~PURGEBITS;
1146         gvar->mm.mmrover->attributes |= purge;
1147 }
1148
1149 //==========================================================================
1150
1151 /*
1152 =====================
1153 =
1154 = MM_SetLock
1155 =
1156 = Locks / unlocks the block
1157 =
1158 =====================
1159 */
1160
1161 void MM_SetLock(memptr *baseptr, boolean locked, global_game_variables_t *gvar)
1162 {
1163         //huge mmblocktype huge *start;
1164         mmblocktype far *start;
1165
1166         start = gvar->mm.mmrover;
1167
1168         do
1169         {
1170                 if(gvar->mm.mmrover->useptr == baseptr)
1171                         break;
1172
1173                 gvar->mm.mmrover = gvar->mm.mmrover->next;
1174
1175                 if(!gvar->mm.mmrover)
1176                         gvar->mm.mmrover = gvar->mm.mmhead;
1177                 else if(gvar->mm.mmrover == start)
1178                 {
1179                         Quit("MM_SetLock: Block not found!");
1180                         //return;
1181                 }
1182
1183         } while(1);
1184
1185         gvar->mm.mmrover->attributes &= ~LOCKBIT;
1186         gvar->mm.mmrover->attributes |= locked*LOCKBIT;
1187 }
1188
1189 //==========================================================================
1190
1191 /*
1192 =====================
1193 =
1194 = MM_SortMem
1195 =
1196 = Throws out all purgable stuff and compresses movable blocks
1197 =
1198 =====================
1199 */
1200
1201 void MM_SortMem(global_game_variables_t *gvar)
1202 {
1203         //huge mmblocktype huge *scan,huge *last,huge *next;
1204         mmblocktype far *scan,far *last,far *next;
1205         unsigned        start,length,source,dest,oldborder;
1206         int                     playing;
1207
1208         //
1209         // lock down a currently playing sound
1210         //
1211 /*++++  playing = SD_SoundPlaying ();
1212         if(playing)
1213         {
1214                 switch (SoundMode)
1215                 {
1216                 case sdm_PC:
1217                         playing += STARTPCSOUNDS;
1218                         break;
1219                 case sdm_AdLib:
1220                         playing += STARTADLIBSOUNDS;
1221                         break;
1222                 }
1223                 MM_SetLock(&(memptr)audiosegs[playing],true);
1224         }
1225
1226
1227         SD_StopSound();*/
1228 //      oldborder = bordercolor;
1229 //      VW_ColorBorder (15);
1230
1231         if(beforesort)
1232                 beforesort();
1233
1234         scan = gvar->mm.mmhead;
1235
1236         last = NULL;            // shut up compiler warning
1237
1238         while(scan)
1239         {
1240                 if(scan->attributes & LOCKBIT)
1241                 {
1242                 //
1243                 // block is locked, so try to pile later blocks right after it
1244                 //
1245                         start = scan->start + scan->length;
1246                 }
1247                 else
1248                 {
1249                         if(scan->attributes & PURGEBITS)
1250                         {
1251                         //
1252                         // throw out the purgable block
1253                         //
1254                                 next = scan->next;
1255                                 FREEBLOCK(scan);
1256                                 //MM_FreeBlock(scan, gvar);
1257                                 last->next = next;
1258                                 scan = next;
1259                                 continue;
1260                         }
1261                         else
1262                         {
1263                         //
1264                         // push the non purgable block on top of the last moved block
1265                         //
1266                                 if(scan->start != start)
1267                                 {
1268                                         length = scan->length;
1269                                         source = scan->start;
1270                                         dest = start;
1271                                         while(length > 0xf00)
1272                                         {
1273                                                 movedata(source,0,dest,0,0xf00*16);
1274                                                 length -= 0xf00;
1275                                                 source += 0xf00;
1276                                                 dest += 0xf00;
1277                                         }
1278                                         movedata(source,0,dest,0,length*16);
1279
1280                                         scan->start = start;
1281                                         *(unsigned *)scan->useptr = start;
1282                                 }
1283                                 start = scan->start + scan->length;
1284                         }
1285                 }
1286
1287                 last = scan;
1288                 scan = scan->next;              // go to next block
1289         }
1290
1291         gvar->mm.mmrover = gvar->mm.mmhead;
1292
1293         if(aftersort)
1294                 aftersort();
1295
1296 //      VW_ColorBorder (oldborder);
1297
1298 /*++++  if(playing)
1299                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
1300 }
1301
1302 //==========================================================================
1303
1304 /*
1305 =====================
1306 =
1307 = MM_ShowMemory
1308 =
1309 =====================
1310 */
1311
1312 void MM_ShowMemory(global_game_variables_t *gvar)
1313 {
1314         //huge mmblocktype huge *scan;
1315         mmblocktype far *scan;
1316         word temp;
1317         sdword  end,owner;
1318         //word chx,chy;
1319         word w;
1320         //dword wwww;
1321         byte    scratch[160],scratch0[4096],scratch1[160],str[16];
1322         //byte d = '#';
1323 //****  VW_SetDefaultColors();
1324 //****  VW_SetLineWidth(40);
1325 //++++mh        temp = bufferofs;
1326 //++++mh        bufferofs = 0;
1327 //****  VW_SetScreen (0,0);
1328         scan = gvar->mm.mmhead;
1329         end = -1;
1330
1331         CA_OpenDebug (gvar);
1332         w=0;
1333         while(scan)
1334         {
1335                 strcpy(scratch, AARESET);
1336                 if(scan->attributes & PURGEBITS)
1337                         strcpy(scratch0, AAMAGENTA);            // dark purple = purgable
1338                 else
1339                         strcpy(scratch0, AABLUE);               // medium blue = non purgable
1340                 if(scan->attributes & LOCKBIT)
1341                         strcpy(scratch0, AARED);                // red = locked
1342                 if(scan->start<=end)
1343                 {
1344                         printf("\nend==%d\n\n", end);
1345                         strcat(scratch, "MM_ShowMemory: Memory block order currupted!\n");
1346                         strcat(scratch, "End's Size: ");
1347                         ultoa (end,str,10);
1348                         strcat (scratch,str);
1349                         strcat(scratch, "\nscan->start's Size: ");
1350                         ultoa (scan->start,str,10);
1351                         strcat (scratch,str);
1352                         write(gvar->handle.debughandle,scratch,strlen(scratch));
1353                         //modexprint(&page, chx, chy, 1, 0, 24, "\nMM_ShowMemory: Memory block order currupted!\n");
1354                         break;
1355                 }
1356                 end = scan->start+(scan->length)-1;
1357 //++++          chy = scan->start/320;
1358 //++++          chx = scan->start%320;
1359                                 //modexhlin(page, scan->start, (unsigned)end, chy, color);
1360                                 //for(chx=scan->start;chx+4>=(word)end;chx+=4)
1361                                 //{
1362 //++++                                  modexClearRegion(page, chx, chy, 4, 4, color);
1363                                 //}
1364 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1365                 for(w=(scan->start)/80;w<=end/80;w++)
1366                 {
1367                         //printf("+     %u      %lu\n", w, scan->length);
1368                         strcat(scratch0, "+");
1369                 }
1370                 //++==++==optional strcat(scratch0, AARESET); strcat(scratch0, AAGREY); strcat(scratch0,"_");
1371 //++++          VW_Plot(scan->start,0,15);
1372 //++++                          modexClearRegion(page, chx, chy, 4, 4, 15);
1373 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1374
1375                 //wwww=(dword)(scan->next->start)-(dword)scan->start;
1376                 //wwww=(dword)scan->start+(dword)(scan->next->start);
1377                 if (scan->next && scan->next->start >= end+1)
1378                 {
1379                         strcat(scratch0, AARESET);
1380                         //++==++==optional strcat(scratch0, "\n");
1381                         strcat(scratch0,AAGREEN);
1382                         for(w=(end+1)/80;w<=((scan->next->start-scan->start)/80);w++)
1383                         //for(w=(wwww)/80;w<=((end+1)/80);w++)
1384                         //for(w=(end+1)/80;w<=((wwww)/80);w++)
1385                         {
1386                                 //printf("0     %x      %u      %lu\n", scan->next->start, w, scan->length);
1387                                 strcat(scratch0,"0");
1388                         }
1389                         //printf("==================\n");
1390                         //printf("w=%u  wwww=%lu        start=%04x      next=%04x       end=%lu\n", w/80, wwww/80, scan->start, (scan->next->start), end+1);
1391                         //printf("==================\n");
1392                         strcat(scratch0, "\n");
1393                         //getch();
1394                 }/*else {//if(scan->next->start <= scan->start){
1395                         scan->next->start=scan->start+0x1000;
1396                         wwww=(dword)(scan->next->start)-(dword)scan->start;
1397                         strcat(scratch0, AARESET);
1398                         strcat(scratch0, "\n");
1399                         strcat(scratch0,AAGREEN);
1400                         for(w=(end+1);w<=(0x1000/80);w++)
1401                         {
1402                                 //printf("0     %x      %x      %u\n", scan->start, w);
1403                                 strcat(scratch0,"0");
1404                         }
1405                         printf("================\n");
1406                         printf("w=%x    start=%x        next=%x end=%u  %lu\n", w, scan->start, (scan->next->start), end+1, wwww);
1407                         printf("================\n");
1408                         getch();
1409                 }*/
1410                 strcat(scratch0, AARESET);
1411                 //strcat(scratch0,"\n");
1412                         //for(chx=scan->next->start;chx+4>=(word)end+1;chx+=4)
1413                         //{
1414 //                              chx+=scan->next->start;
1415 //                              modexClearRegion(page, chx, chy, 4, 4, 2);
1416                         //}
1417                                         //modexhlin(page, end+1,scan->next->start, chy, 0);
1418 /*              y = scan->start/320;
1419                 x = scan->start%320;
1420                 VW_Hlin(x,x+end,y,color);
1421                 VW_Plot(x,y,15);*/
1422 //++++                  VW_Hlin(x+end+1,x+(scan->next->start-scan->start),y,0); // black = free
1423                 strcat(scratch,"Seg:");
1424                 ultoa (scan->start,str,16);
1425                 strcat (scratch,str);
1426                 strcat (scratch,"\tSize:");
1427                 ultoa ((unsigned)scan->length,str,10);
1428                 strcat (scratch,str);
1429                 strcat (scratch,"\tOwner:0x");
1430                 owner = (unsigned)scan->useptr;
1431                 ultoa (owner,str,16);
1432                 strcat (scratch,str);
1433                 strcat (scratch,"\n");
1434                 write(gvar->handle.debughandle,scratch,strlen(scratch));
1435                 write(gvar->handle.debughandle,scratch0,strlen(scratch0));
1436 //modexprint(page, chx, chy, 1, 0, 24, &scratch);
1437 //++++chy+=4;
1438 //fprintf(stdout, "%s", scratch);
1439
1440                 scan = scan->next;
1441         }
1442         /*strcpy(scratch1, AARESET);
1443         strcat(scratch1, "========================================\n");
1444         strcat(scratch1, "near=  ");
1445         ultoa (*(gvar->mm.nearheap),str,10);
1446         strcat (scratch1,str);
1447         strcat(scratch1, "      far= ");
1448         ultoa (*(gvar->mm.farheap),str,10);
1449         strcat (scratch1,str);
1450         strcat(scratch1, "\n");
1451         //strcat(scratch1, "&near=      %Fp ", &(gvar->mm.nearheap));
1452         //strcat(scratch1, "&far=       %Fp", &(gvar->mm.farheap));
1453         //strcat(scratch1, "\n");
1454         strcat(scratch1, "========================================\n");
1455         write(gvar->handle.debughandle,scratch1,strlen(scratch1));*/
1456
1457
1458         CA_CloseDebug (gvar);
1459
1460 //++++mh        IN_Ack();
1461 //****  VW_SetLineWidth(64);
1462 //++++mh        bufferofs = temp;
1463 }
1464
1465 //==========================================================================
1466
1467 /*
1468 =====================
1469 =
1470 = MM_DumpData
1471 =
1472 =====================
1473 */
1474
1475 void MM_DumpData(global_game_variables_t *gvar)
1476 {
1477         //huge mmblocktype huge *scan,huge *best;
1478         mmblocktype far *scan,far *best;
1479         long    lowest,oldlowest;
1480         word    owner;
1481         byte    lock,purge;
1482         FILE    *dumpfile;
1483
1484         free(gvar->mm.nearheap);
1485 #ifdef __BORLANDC__
1486                 dumpfile = fopen ("mmdump.16b","w");
1487 #endif
1488 #ifdef __WATCOMC__
1489                 dumpfile = fopen ("mmdump.16w","w");
1490 #endif
1491         if (!dumpfile){
1492                 printf("MM_DumpData: Couldn't open MMDUMP.16!\n");
1493                 return;
1494         }
1495
1496         lowest = -1;
1497         do
1498         {
1499                 oldlowest = lowest;
1500                 lowest = 0xffff;
1501
1502                 scan = gvar->mm.mmhead;
1503                 while (scan)
1504                 {
1505                         owner = (unsigned)scan->useptr;
1506
1507                         if (owner && owner<lowest && owner > oldlowest)
1508                         {
1509                                 best = scan;
1510                                 lowest = owner;
1511                         }
1512
1513                         scan = scan->next;
1514                 }
1515
1516                 if (lowest != 0xffff)
1517                 {
1518                         if (best->attributes & PURGEBITS)
1519                                 purge = 'P';
1520                         else
1521                                 purge = '-';
1522                         if (best->attributes & LOCKBIT)
1523                                 lock = 'L';
1524                         else
1525                                 lock = '-';
1526                         fprintf (dumpfile,"0x%p (%c%c) = %u\n"
1527                         ,(unsigned)lowest,lock,purge,best->length);
1528                 }
1529
1530         } while (lowest != 0xffff);
1531
1532         fclose(dumpfile);
1533         printf("MMDUMP.16 created.\n");
1534 }
1535
1536 //==========================================================================
1537
1538
1539 /*
1540 ======================
1541 =
1542 = MM_UnusedMemory
1543 =
1544 = Returns the total free space without purging
1545 =
1546 ======================
1547 */
1548
1549 dword MM_UnusedMemory(global_game_variables_t *gvar)
1550 {
1551         dword free;
1552         //huge mmblocktype huge *scan;
1553         mmblocktype far *scan;
1554
1555         free = 0;
1556         scan = gvar->mm.mmhead;
1557
1558         while(scan->next)
1559         {
1560                 free += scan->next->start - (scan->start + scan->length);
1561                 scan = scan->next;
1562         }
1563
1564         return free*16lu;
1565 //      return free;
1566 }
1567
1568 //==========================================================================
1569
1570
1571 /*
1572 ======================
1573 =
1574 = MM_TotalFree
1575 =
1576 = Returns the total free space with purging
1577 =
1578 ======================
1579 */
1580
1581 dword MM_TotalFree(global_game_variables_t *gvar)
1582 {
1583         dword free;
1584         //huge mmblocktype huge *scan;
1585         mmblocktype far *scan;
1586
1587         free = 0;
1588         scan = gvar->mm.mmhead;
1589
1590         while(scan->next)
1591         {
1592                 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1593                         free += scan->length;
1594                 free += scan->next->start - (scan->start + scan->length);
1595                 scan = scan->next;
1596         }
1597
1598         return free*16lu;
1599 //      return free;
1600 }
1601
1602 //==========================================================================
1603
1604 /*
1605 =====================
1606 =
1607 = MM_Report
1608 =
1609 =====================
1610 */
1611
1612 void MM_Report_(global_game_variables_t *gvar)
1613 {
1614         printf("========================================\n");
1615         printf("                MM_Report_\n");
1616         printf("========================================\n");
1617         if(MML_CheckForEMS())
1618         {
1619                 printf("        LIMEMS\n");
1620                 printf("                EMM v%x.%x available\n", gvar->pm.emm.EMSVer>>4,gvar->pm.emm.EMSVer&0x0F);
1621                 printf("                totalEMSpages:  %u      ", gvar->pm.emm.totalEMSpages); printf("freeEMSpages:   %u\n", gvar->pm.emm.freeEMSpages);
1622                 printf("                EMSPageFrame:   %x\n", gvar->pm.emm.EMSPageFrame);
1623         }
1624         if(MML_CheckForXMS())
1625         {
1626                 printf("        XMS\n");
1627                 printf("                XMSDriver:      %X\n", gvar->pm.xmm.XMSDriver);
1628         }
1629         printf("nearheap:       %lu             ", gvar->mmi.nearheap); printf("farheap:        %lu\n", gvar->mmi.farheap);
1630         if(MML_CheckForEMS()) printf("EMSmem:           %lu     ", gvar->mmi.EMSmem); if(MML_CheckForXMS()) printf("XMSmem:             %lu", gvar->mmi.XMSmem); printf("\n");
1631         printf("convmem:\n"); DebugMemory_(gvar, 0);
1632         //printf("mainmem:      %lu\n", gvar->mmi.mainmem);
1633         //printf("Total convmem:        %lu     ", gvar->mmi.mainmem); printf("TotalFree:       %lu     ", MM_TotalFree(gvar)+gvar->mmi.EMSmem+gvar->mmi.XMSmem+gvar->mmi.XMSmem); printf("TotalUsed:   %lu\n", gvar->mmi.mainmem);
1634         //printf("                      UnusedMemory:   %lu\n", MM_UnusedMemory(gvar));
1635
1636 }
1637
1638 //==========================================================================
1639
1640 /*
1641 =====================
1642 =
1643 = MM_EMSerr
1644 =
1645 =====================
1646 */
1647
1648 void MM_EMSerr(byte *stri, byte err)
1649 {
1650         //Returns a text string describing the error code in EMS.Error.
1651         switch(err)
1652         {
1653                 case 0x0:
1654                         strcat(stri, "successful");
1655                 break;
1656                 case 0x80:
1657                         strcat(stri, "internal error");
1658                 break;
1659                 case 0x81:
1660                         strcat(stri, "hardware malfunction");
1661                 break;
1662                 case 0x82:
1663                         strcat(stri, "busy .. retry later");
1664                 break;
1665                 case 0x83:
1666                         strcat(stri, "invalid handle");
1667                 break;
1668                 case 0x84:
1669                         strcat(stri, "undefined function requested by application");
1670                 break;
1671                 case 0x85:
1672                         strcat(stri, "no more handles available");
1673                 break;
1674                 case 0x86:
1675                         strcat(stri, "error in save or restore of mapping context");
1676                 break;
1677                 case 0x87:
1678                         strcat(stri, "insufficient memory pages in system");
1679                 break;
1680                 case 0x88:
1681                         strcat(stri, "insufficient memory pages available");
1682                 break;
1683                 case 0x89:
1684                         strcat(stri, "zero pages requested");
1685                 break;
1686                 case 0x8A:
1687                         strcat(stri, "invalid logical page number encountered");
1688                 break;
1689                 case 0x8B:
1690                         strcat(stri, "invalid physical page number encountered");
1691                 break;
1692                 case 0x8C:
1693                         strcat(stri, "page-mapping hardware state save area is full");
1694                 break;
1695                 case 0x8D:
1696                         strcat(stri, "save of mapping context failed");
1697                 break;
1698                 case 0x8E:
1699                         strcat(stri, "restore of mapping context failed");
1700                 break;
1701                 case 0x8F:
1702                         strcat(stri, "undefined subfunction");
1703                 break;
1704                 case 0x90:
1705                         strcat(stri, "undefined attribute type");
1706                 break;
1707                 case 0x91:
1708                         strcat(stri, "feature not supported");
1709                 break;
1710                 case 0x92:
1711                         strcat(stri, "successful, but a portion of the source region has been overwritten");
1712                 break;
1713                 case 0x93:
1714                         strcat(stri, "length of source or destination region exceeds length of region allocated to either source or destination handle");
1715                 break;
1716                 case 0x94:
1717                         strcat(stri, "conventional and expanded memory regions overlap");
1718                 break;
1719                 case 0x95:
1720                         strcat(stri, "offset within logical page exceeds size of logical page");
1721                 break;
1722                 case 0x96:
1723                         strcat(stri, "region length exceeds 1 MB");
1724                 break;
1725                 case 0x97:
1726                         strcat(stri, "source and destination EMS regions have same handle and overlap");
1727                 break;
1728                 case 0x98:
1729                         strcat(stri, "memory source or destination type undefined");
1730                 break;
1731                 case 0x9A:
1732                         strcat(stri, "specified alternate map register or DMA register set not supported");
1733                 break;
1734                 case 0x9B:
1735                         strcat(stri, "all alternate map register or DMA register sets currently allocated");
1736                 break;
1737                 case 0x9C:
1738                         strcat(stri, "alternate map register or DMA register sets not supported");
1739                 break;
1740                 case 0x9D:
1741                         strcat(stri, "undefined or unallocated alternate map register or DMA register set");
1742                 break;
1743                 case 0x9E:
1744                         strcat(stri, "dedicated DMA channels not supported");
1745                 break;
1746                 case 0x9F:
1747                         strcat(stri, "specified dedicated DMA channel not supported");
1748                 break;
1749                 case 0xA0:
1750                         strcat(stri, "no such handle name");
1751                 break;
1752                 case 0xA1:
1753                         strcat(stri, "a handle found had no name, or duplicate handle name");
1754                 break;
1755                 case 0xA2:
1756                         strcat(stri, "attempted to wrap around 1M conventional address space");
1757                 break;
1758                 case 0xA3:
1759                         strcat(stri, "source array corrupted");
1760                 break;
1761                 case 0xA4:
1762                         strcat(stri, "operating system denied access");
1763                 break;
1764                 default:
1765                         strcat(stri, "undefined error");
1766         }
1767 }
1768
1769 //==========================================================================
1770
1771 /*
1772 =====================
1773 =
1774 = MM_BombOnError
1775 =
1776 =====================
1777 */
1778
1779 void MM_BombOnError(boolean bomb, global_game_variables_t *gvar)
1780 {
1781         gvar->mm.bombonerror = bomb;
1782 }
1783
1784 /*void MM_GetNewBlock(global_game_variables_t *gvar)
1785 {
1786         if(!gvar->mm.mmfree)
1787                 MML_ClearBlock(gvar);
1788         gvar->mm.mmnew=gvar->mm.mmfree;
1789         gvar->mm.mmfree=gvar->mm.mmfree->next;
1790         if(!(gvar->mm.mmnew=gvar->mm.mmfree))
1791         {
1792                 printf("MM_GETNEWBLOCK: No free blocks!\n");
1793                 return;
1794         }
1795         gvar->mm.mmfree=gvar->mm.mmfree->next;
1796 }
1797
1798 void MM_FreeBlock(mmblocktype *x, global_game_variables_t *gvar)
1799 {
1800         x->useptr=NULL;
1801         x->next=gvar->mm.mmfree;
1802         gvar->mm.mmfree=x;
1803 }*/
1804
1805 void xms_call(byte v, global_game_variables_t *gvar)
1806 {
1807         dword XMSDriver = gvar->pm.xmm.XMSDriver;
1808         __asm {
1809                 mov     ah,[v]
1810                 call [DWORD PTR XMSDriver]
1811         }
1812 }
1813
1814 /*void MM_seguin(void)
1815 {
1816         __asm {
1817                 push    ds
1818                 mov     ax,ds
1819                 inc             ax
1820                 mov     ds,ax
1821         }
1822 }
1823
1824 void MM_segude(void)
1825 {
1826         __asm {
1827                 pop ds
1828         }
1829 }*/
1830
1831 /*
1832 pull data from far and put it into ds var
1833 mov ax,es:si
1834 mov x,ax
1835 */
1836 /*
1837 ss stack segment
1838 sp top of stack
1839 bp bottem of stack
1840 */