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(global_game_variables_t *gvar)
 441 {
 442         boolean errorflag=false;
 443         gvar->mm.numUMBs = 0;
 444
 445         __asm {
 446                 mov     ax,0x4300
 447                 int     0x2f                            // query status of installed diver
 448                 cmp     al,0x80
 449                 je      good
 450                 mov     errorflag,1
 451 #ifdef __BORLANDC__
 452         }
 453 #endif
 454                 good:
 455 #ifdef __WATCOMC__
 456         }
 457 #endif
 458         if(errorflag==true) return false;
 459         else return true;
 460 }
 461
 462 #ifndef __16_PM__
 463 /*
 464 ======================
 465 =
 466 = MML_SetupXMS
 467 =
 468 = Try to allocate all upper memory block
 469 =
 470 =======================
 471 */
 472
 473 void MML_SetupXMS(global_game_variables_t *gvar)
 474 {
 475         word    base,size;
 476
 477
 478         __asm {
 479                 mov     ax,0x4310
 480                 int     0x2f
 481                 mov     [WORD PTR XMSaddr],bx
 482                 mov     [WORD PTR XMSaddr+2],es         // function pointer to XMS driver
 483         }
 484 getmemory:
 485         __asm {
 486                 mov     ah,XMS_ALLOCUMB
 487                 mov     dx,0xffff                                       // try for largest block possible
 488                 //mov     ax,dx                                         // Set available Kbytes.
 489                 call    [DWORD PTR XMSaddr]
 490                 or      ax,ax
 491                 jnz     gotone
 492
 493                 cmp     bl,0xb0                                         // error: smaller UMB is available
 494                 jne     done;
 495
 496                 mov     ah,XMS_ALLOCUMB
 497                 call    [DWORD PTR XMSaddr]             // DX holds largest available UMB
 498                 or      ax,ax
 499                 jz      done                                            // another error...
 500 #ifdef __BORLANDC__
 501         }
 502 #endif
 503                 gotone:
 504 #ifdef __BORLANDC__
 505         __asm {
 506 #endif
 507                 mov     [base],bx
 508                 mov     [size],dx
 509 #ifdef __BORLANDC__
 510         }
 511 #endif
 512                 done:
 513 #ifdef __WATCOMC__
 514         }
 515 #endif
 516 //      printf("base=%u ", base); printf("size=%u\n", size);
 517         MML_UseSpace(base,size, gvar);
 518         gvar->mmi.XMSmem += size*16;
 519         gvar->mm.UMBbase[gvar->mm.numUMBs] = base;
 520         gvar->mm.numUMBs++;
 521         if(gvar->mm.numUMBs < MAXUMBS)
 522                 goto getmemory;
 523 }
 524
 525
 526 /*
 527 ======================
 528 =
 529 = MML_ShutdownXMS
 530 =
 531 ======================
 532 */
 533
 534 void MML_ShutdownXMS(global_game_variables_t *gvar)
 535 {
 536         int     i;
 537         unsigned        base;
 538
 539         for (i=0;i<gvar->mm.numUMBs;i++)
 540         {
 541                 base = gvar->mm.UMBbase[i];
 542                 __asm {
 543                         mov     ah,XMS_FREEUMB
 544                         mov     dx,[base]
 545                         call    [DWORD PTR XMSaddr]
 546                 }
 547         }
 548 }
 549 #endif
 550 //==========================================================================
 551
 552 /*
 553 ======================
 554 =
 555 = MML_UseSpace
 556 =
 557 = Marks a range of paragraphs as usable by the memory manager
 558 = This is used to mark space for the near heap, far heap, ems page frame,
 559 = and upper memory blocks
 560 =
 561 ======================
 562 */
 563
 564 /*void MML_UseSpace(word segstart, dword seglength, global_game_variables_t *gvar)
 565 {
 566         //huge mmblocktype huge *scan,huge *last;
 567         word            segm=1;
 568         word    oldend;
 569         dword           segmlen;
 570         dword           extra;
 571
 572         scan = last = gvar->mm.mmhead;
 573         gvar->mm.mmrover = gvar->mm.mmhead;             // reset rover to start of memory
 574
 575 //
 576 // search for the block that contains the range of segments
 577 //
 578         while(scan->start+scan->length < segstart)
 579         {
 580                 last = scan;
 581                 scan = scan->next;
 582         }
 583
 584 //
 585 // take the given range out of the block
 586 //
 587         oldend = scan->start + scan->length;
 588         extra = oldend - (segstart+seglength);
 589
 590         segmlen=extra;
 591
 592         //++++emsver stuff!
 593         if(segm>1)/// || extra>=0x10000lu)
 594         //if(extra>0xfffflu)
 595         {
 596                 scan->blob=segm;
 597
 598                 //MML_UseSpace(segstart, seglength, gvar);
 599
 600                 printf("MML_UseSpace: Segment spans two blocks!\n");
 601         //}
 602         printf("segm=%u         ", segm);
 603         printf("ex=%lu  ", extra);
 604         printf("old=%u  ", oldend);
 605         printf("start+seglen=%lu\n", segstart+seglength);
 606         printf("segsta=%x       ", segstart);
 607         printf("len=%lu ", scan->length);
 608         printf("seglen=%lu      ", seglength);
 609         printf("segmlen=%lu\n", segmlen);
 610         }
 611 //++++todo: linked list of segment!
 612         if(segstart == scan->start)
 613         {
 614                 last->next = scan->next;                        // unlink block
 615                 FREEBLOCK(scan);
 616                 scan = last;
 617         }
 618         else
 619                 scan->length = segstart-scan->start;    // shorten block
 620
 621         if(extra > 0)
 622         {
 623                 GETNEWBLOCK;
 624                 gvar->mm.mmnew->useptr = NULL;
 625
 626                 gvar->mm.mmnew->next = scan->next;
 627                 scan->next = gvar->mm.mmnew;
 628                 gvar->mm.mmnew->start = segstart+seglength;
 629                 gvar->mm.mmnew->length = extra;
 630                 gvar->mm.mmnew->attributes = LOCKBIT;
 631         }//else if(segm>0) goto segu;
 632
 633 }*/
 634 void MML_UseSpace(word segstart, dword seglength, global_game_variables_t *gvar)
 635 {
 636         mmblocktype far *scan,far *last;
 637         word    oldend;
 638         sdword          extra;
 639         //word segm=1;
 640
 641         scan = last = gvar->mm.mmhead;
 642         gvar->mm.mmrover = gvar->mm.mmhead;             // reset rover to start of memory
 643
 644 //
 645 // search for the block that contains the range of segments
 646 //
 647         while (scan->start+scan->length < segstart)
 648         {
 649                 last = scan;
 650                 scan = scan->next;
 651         }
 652
 653 //
 654 // find out how many blocks it spans!
 655 //
 656         /*for(;seglength>=0x10000;seglength-=0xFFFF)
 657         {
 658                 //printf("      seglen=%lu\n", segmlen);
 659                 segm++;
 660         }*/
 661
 662 //
 663 // take the given range out of the block
 664 //
 665         oldend = scan->start + scan->length;
 666         extra = oldend - (segstart+((unsigned)seglength));
 667         if (extra < 0)
 668         {
 669                 printf("========================================\n");
 670                 printf("start=%x        ", scan->start);
 671                 printf("old=%u  ", oldend);
 672                 printf("start+seglen=%lu\n", segstart+seglength);
 673                 printf("segsta=%x       ", segstart);
 674                 printf("len=%lu ", scan->length);
 675                 printf("seglen=%lu      ", seglength);
 676                 printf("\n");
 677                 printf("MML_UseSpace: Segment spans two blocks! %d\n", extra);
 678                 printf("========================================\n");
 679                 //return;
 680         }
 681
 682         if (segstart == scan->start)
 683         {
 684                 last->next = scan->next;                        // unlink block
 685                 FREEBLOCK(scan);
 686                 scan = last;
 687         }
 688         else
 689                 scan->length = segstart-scan->start;    // shorten block
 690
 691         if (extra > 0)
 692         {
 693                 GETNEWBLOCK;
 694                 gvar->mm.mmnew->useptr = NULL;
 695
 696                 gvar->mm.mmnew->next = scan->next;
 697                 scan->next = gvar->mm.mmnew;
 698                 gvar->mm.mmnew->start = segstart+seglength;
 699                 gvar->mm.mmnew->length = extra;
 700                 gvar->mm.mmnew->attributes = LOCKBIT;
 701         }
 702
 703 }
 704
 705 //==========================================================================
 706
 707 /*
 708 ====================
 709 =
 710 = MML_ClearBlock
 711 =
 712 = We are out of blocks, so free a purgable block
 713 =
 714 ====================
 715 */
 716
 717 void MML_ClearBlock(global_game_variables_t *gvar)
 718 {
 719         //huge mmblocktype huge *scan,huge *last;
 720         mmblocktype far *scan,far *last;
 721
 722         scan = gvar->mm.mmhead->next;
 723
 724         while(scan)
 725         {
 726                 if(!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS))
 727                 {
 728                         MM_FreePtr(scan->useptr, gvar);
 729                         return;
 730                 }
 731                 scan = scan->next;
 732         }
 733
 734         printf("MM_ClearBlock: No purgable blocks!\n");
 735 }
 736
 737
 738 //==========================================================================
 739
 740 /*
 741 ===================
 742 =
 743 = MM_Startup
 744 =
 745 = Grabs all space from turbo with malloc/farmalloc
 746 = Allocates bufferseg misc buffer
 747 =
 748 ===================
 749 */
 750
 751 void MM_Startup(global_game_variables_t *gvar)
 752 {
 753         int i;
 754         //dword length,seglength;
 755         dword length; word seglength;
 756         //huge void huge        *start;
 757         void far        *start;
 758         word    segstart;//,endfree;
 759         //memptr *peeonself;
 760
 761         if(gvar->mm.mmstarted)
 762                 MM_Shutdown(gvar);
 763
 764         gvar->mm.mmstarted = true;
 765         gvar->mm.bombonerror = true;
 766
 767 //
 768 // set up the linked list (everything in the free list;
 769 //
 770         gvar->mm.mmhead = NULL;
 771         gvar->mm.mmfree = &(gvar->mm.mmblocks[0]);
 772         for(i=0;i<MAXBLOCKS-1;i++)
 773         {
 774                 gvar->mm.mmblocks[i].next = &(gvar->mm.mmblocks[i+1]);
 775         }
 776         gvar->mm.mmblocks[i].next = NULL;
 777
 778 //
 779 // locked block of all memory until we punch out free space
 780 //
 781         GETNEWBLOCK;
 782         gvar->mm.mmhead = gvar->mm.mmnew;                               // this will allways be the first node
 783         gvar->mm.mmnew->start = 0;
 784         gvar->mm.mmnew->length = 0xffff;
 785         gvar->mm.mmnew->attributes = LOCKBIT;
 786         gvar->mm.mmnew->next = NULL;
 787         //gvar->mm.mmnew->useptr = peeonself;
 788         gvar->mm.mmrover = gvar->mm.mmhead;
 789
 790         //printf("              %x\n", peeonself);
 791         //printf("              %x\n", *peeonself);
 792 //
 793 // get all available near conventional memory segments
 794 //
 795 #ifdef __WATCOMC__
 796         _nheapgrow();
 797         length=(dword)_memavl();//(dword)GetFreeSize();
 798         //huge start = (void huge *)(gvar->mm.nearheap = _nmalloc(length));
 799         start = (void far *)(gvar->mm.nearheap = _nmalloc(length));
 800 #endif
 801 #ifdef __BORLANDC__
 802         length=coreleft();
 803         //huge start = (void huge *)(gvar->mm.nearheap = malloc(length));
 804         start = (void far *)(gvar->mm.nearheap = malloc(length));
 805 #endif
 806         length -= 16-(FP_OFF(start)&15);
 807         length -= SAVENEARHEAP;
 808         seglength = length / 16;                        // now in paragraphs
 809         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 810         MML_UseSpace(segstart,seglength, gvar);
 811         gvar->mmi.nearheap = length;
 812         //printf("start=%Fp     segstart=%x     seglen=%lu      len=%lu\n", start, segstart, seglength, length);
 813
 814 //
 815 // get all available far conventional memory segments
 816 //
 817         //printf("_FARCORELEFT                          %lu\n", _FCORELEFT);
 818 #ifdef __WATCOMC__
 819         _fheapgrow();
 820         length=_FCORELEFT;//_fcoreleft();//(dword)GetFarFreeSize();//0xffffUL*4UL;
 821 #endif
 822 #ifdef __BORLANDC__
 823         printf("farcoreleft()                           %lu\n", farcoreleft());
 824         printf("(farcoreleft()+32)-_FCORELEFT   %d\n", (sword)((farcoreleft()+32)-_FCORELEFT));
 825         length=farcoreleft();//_fcoreleft();//(dword)GetFarFreeSize();//0xffffUL*4UL;
 826 #endif
 827         start = gvar->mm.farheap = _fmalloc(length);
 828         //start = gvar->mm.farheap = halloc(length, 1);
 829         length -= 16-(FP_OFF(start)&15);
 830         length -= SAVEFARHEAP;
 831         seglength = length / 16;                        // now in paragraphs
 832         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 833         MML_UseSpace(segstart,seglength, gvar);
 834         gvar->mmi.farheap = length;
 835         //printf("start=%Fp     segstart=%x     seglen=%lu      len=%lu\n", start, segstart, seglength, length);
 836
 837         gvar->mmi.mainmem = gvar->mmi.nearheap + gvar->mmi.farheap;
 838
 839 #ifndef __16_PM__
 840         if(!dbg_debugpm) {
 841 //
 842 // detect EMS and allocate up to 64K at page frame
 843 //
 844         gvar->mmi.EMSmem = 0;
 845 //goto emsskip; //0000
 846         for(i = 1;i <
 847 #ifdef __WATCOMC__
 848         __argc
 849 #endif
 850 #ifdef __BORLANDC__
 851         _argc
 852 #endif
 853         ;i++)
 854         {
 855                 if(US_CheckParm(
 856 #ifdef __WATCOMC__
 857         __argv[i]
 858 #endif
 859 #ifdef __BORLANDC__
 860         _argv[i]
 861 #endif
 862                         ,ParmStringsexmm) == 0)
 863                         goto emsskip;                           // param NOEMS
 864         }
 865         if(MML_CheckForEMS())
 866         {
 867                 MML_SetupEMS(gvar);                                     // allocate space
 868                 //16_PM: EMS4! AND EMS 3.2 MASSIVE DATA HANDLMENT!
 869                 MML_UseSpace(gvar->mm.EMSPageFrame,(MAPPAGES)*0x4000lu, gvar);
 870                 //if(gvar->pm.emm.EMSVer<0x40)
 871                         MM_MapEMS(gvar);                                        // map in used pages
 872                 //else
 873                         //MM_MapXEMS(gvar);                                     // map in used pages
 874         }
 875
 876 //
 877 // detect XMS and get upper memory blocks
 878 //
 879 emsskip:
 880         gvar->mmi.XMSmem = 0;
 881 goto xmsskip;//0000
 882         for(i = 1;i <
 883 #ifdef __WATCOMC__
 884         __argc
 885 #endif
 886 #ifdef __BORLANDC__
 887         _argc
 888 #endif
 889         ;i++)
 890         {
 891                 if(US_CheckParm(
 892 #ifdef __WATCOMC__
 893         __argv[i]
 894 #endif
 895 #ifdef __BORLANDC__
 896         _argv[i]
 897 #endif
 898                         ,ParmStringsexmm) == 0)
 899                         goto xmsskip;                           // param NOXMS
 900         }
 901         if(MML_CheckForXMS(gvar))
 902         {
 903                 MML_SetupXMS(gvar);                                     // allocate as many UMBs as possible
 904         }
 905
 906         }
 907 #endif
 908 //
 909 // allocate the misc buffer
 910 //
 911 xmsskip:
 912         gvar->mm.mmrover = gvar->mm.mmhead;             // start looking for space after low block
 913
 914         MM_GetPtr(&(gvar->mm.bufferseg),BUFFERSIZE, gvar);
 915 }
 916
 917 //==========================================================================
 918
 919 /*
 920 ====================
 921 =
 922 = MM_Shutdown
 923 =
 924 = Frees all conventional, EMS, and XMS allocated
 925 =
 926 ====================
 927 */
 928
 929 void MM_Shutdown(global_game_variables_t *gvar)
 930 {
 931         if(!(gvar->mm.mmstarted))
 932                 return;
 933
 934         _ffree(gvar->mm.farheap);//     printf("                far freed\n");
 935 #ifdef __WATCOMC__
 936         _nfree(gvar->mm.nearheap);//    printf("                near freed\n");
 937 #endif
 938 #ifdef __BORLANDC__
 939         free(gvar->mm.nearheap);//      printf("                near freed\n");
 940 #endif
 941 #ifdef __DEBUG__
 942         if(!dbg_debugpm) {
 943 #endif
 944         if(MML_CheckForEMS()){ MML_ShutdownEMS(gvar); }//printf("               EMS freed\n"); }
 945         if(MML_CheckForXMS(gvar)){ MML_ShutdownXMS(gvar); }//printf("           XMS freed\n"); }
 946 #ifdef __DEBUG__
 947         }
 948 #endif
 949 }
 950
 951 //==========================================================================
 952
 953 /*
 954 ====================
 955 =
 956 = MM_GetPtr
 957 =
 958 = Allocates an unlocked, unpurgable block
 959 =
 960 ====================
 961 */
 962
 963 void MM_GetPtr (memptr *baseptr, dword size, global_game_variables_t *gvar)
 964 {
 965         //huge mmblocktype huge *scan,huge *lastscan,huge *endscan,huge *purge,huge *next;
 966         mmblocktype far *scan,far *lastscan,far *endscan,far *purge,far *next;
 967         int                     search;
 968         unsigned        needed,startseg;
 969
 970         needed = (size+15)/16;          // convert size from bytes to paragraphs
 971
 972         GETNEWBLOCK;                            // fill in start and next after a spot is found
 973         gvar->mm.mmnew->length = needed;
 974         gvar->mm.mmnew->useptr = baseptr;
 975         //if(gvar->mm.mmnew->useptr==NULL){
 976 #ifdef __DEBUG_MM__
 977                 printf("MM_GetPtr\n");
 978                 //%04x
 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                 printf("        &baseptr=%Fp    ", &baseptr); printf("&useptr=%Fp\n", &(gvar->mm.mmnew->useptr));
 982 #endif
 983         //exit(-5); }
 984         gvar->mm.mmnew->attributes = BASEATTRIBUTES;
 985
 986 //tryagain:
 987         for (search = 0; search<3; search++)
 988         {
 989         //
 990         // first search:        try to allocate right after the rover, then on up
 991         // second search:       search from the head pointer up to the rover
 992         // third search:        compress memory, then scan from start
 993                 if (search == 1 && gvar->mm.mmrover == gvar->mm.mmhead)
 994                         search++;
 995
 996                 switch (search)
 997                 {
 998                 case 0:
 999                         lastscan = gvar->mm.mmrover;
1000                         scan = gvar->mm.mmrover->next;
1001                         endscan = NULL;
1002                         break;
1003                 case 1:
1004                         lastscan = gvar->mm.mmhead;
1005                         scan = gvar->mm.mmhead->next;
1006                         endscan = gvar->mm.mmrover;
1007                         break;
1008                 case 2:
1009                         MM_SortMem (gvar);
1010                         lastscan = gvar->mm.mmhead;
1011                         scan = gvar->mm.mmhead->next;
1012                         endscan = NULL;
1013                         break;
1014                 }
1015
1016                 startseg = lastscan->start + lastscan->length;
1017
1018                 while (scan != endscan)
1019                 {
1020                         if (scan->start - startseg >= needed)
1021                         {
1022                         //
1023                         // got enough space between the end of lastscan and
1024                         // the start of scan, so throw out anything in the middle
1025                         // and allocate the new block
1026                         //
1027                                 purge = lastscan->next;
1028                                 lastscan->next = gvar->mm.mmnew;
1029                                 gvar->mm.mmnew->start = *(unsigned *)baseptr = startseg;
1030                                 gvar->mm.mmnew->next = scan;
1031                                 while ( purge != scan)
1032                                 {       // free the purgable block
1033                                         next = purge->next;
1034                                         FREEBLOCK(purge);
1035                                         purge = next;           // purge another if not at scan
1036                                 }
1037                                 gvar->mm.mmrover = gvar->mm.mmnew;
1038                                 return; // good allocation!
1039                         }
1040
1041                         //
1042                         // if this block is purge level zero or locked, skip past it
1043                         //
1044                         if ( (scan->attributes & LOCKBIT)
1045                                 || !(scan->attributes & PURGEBITS) )
1046                         {
1047                                 lastscan = scan;
1048                                 startseg = lastscan->start + lastscan->length;
1049                         }
1050
1051
1052                         scan=scan->next;                // look at next line
1053                 }
1054         }
1055
1056         if (gvar->mm.bombonerror)
1057         {
1058 #ifdef __WATCOMC__
1059                 //heapdump();
1060 #endif
1061                 printf(OUT_OF_MEM_MSG,(size-gvar->mmi.nearheap));
1062                 printf("for stability reasons the program will shut down! wwww\n");
1063                 MM_Shutdown(gvar);
1064                 exit(-1);
1065         }
1066         else
1067                 gvar->mm.mmerror = true;
1068 }
1069
1070 //==========================================================================
1071
1072 /*
1073 ====================
1074 =
1075 = MM_FreePtr
1076 =
1077 = Allocates an unlocked, unpurgable block
1078 =
1079 ====================
1080 */
1081
1082 void MM_FreePtr(memptr *baseptr, global_game_variables_t *gvar)
1083 {
1084         //huge mmblocktype huge *scan,huge *last;
1085         mmblocktype far *scan,far *last;
1086
1087         last = gvar->mm.mmhead;
1088         scan = last->next;
1089
1090         if(baseptr == gvar->mm.mmrover->useptr) // removed the last allocated block
1091                 gvar->mm.mmrover = gvar->mm.mmhead;
1092
1093         while(scan->useptr != baseptr && scan)
1094         {
1095                 last = scan;
1096                 scan = scan->next;
1097         }
1098
1099         if(!scan)
1100         {
1101                 printf("MM_FreePtr: Block not found!\n");
1102                 return;
1103         }
1104
1105         last->next = scan->next;
1106
1107         FREEBLOCK(scan);
1108 }
1109 //==========================================================================
1110
1111 /*
1112 =====================
1113 =
1114 = MM_SetPurge
1115 =
1116 = Sets the purge level for a block (locked blocks cannot be made purgable)
1117 =
1118 =====================
1119 */
1120
1121
1122 void MM_SetPurge(memptr *baseptr, int purge, global_game_variables_t *gvar)
1123 {
1124         //huge mmblocktype huge *start;
1125         mmblocktype far *start;
1126
1127         start = gvar->mm.mmrover;
1128
1129         do
1130         {
1131                 if(gvar->mm.mmrover->useptr == baseptr)
1132                         break;
1133
1134                 gvar->mm.mmrover = gvar->mm.mmrover->next;
1135
1136                 if(!gvar->mm.mmrover)
1137                         gvar->mm.mmrover = gvar->mm.mmhead;
1138                 else if(gvar->mm.mmrover == start)
1139                 {
1140                         Quit("MM_SetPurge: Block not found!");
1141                         //return;
1142                 }
1143
1144         } while(1);
1145
1146         gvar->mm.mmrover->attributes &= ~PURGEBITS;
1147         gvar->mm.mmrover->attributes |= purge;
1148 }
1149
1150 //==========================================================================
1151
1152 /*
1153 =====================
1154 =
1155 = MM_SetLock
1156 =
1157 = Locks / unlocks the block
1158 =
1159 =====================
1160 */
1161
1162 void MM_SetLock(memptr *baseptr, boolean locked, global_game_variables_t *gvar)
1163 {
1164         //huge mmblocktype huge *start;
1165         mmblocktype far *start;
1166
1167         start = gvar->mm.mmrover;
1168
1169         do
1170         {
1171                 if(gvar->mm.mmrover->useptr == baseptr)
1172                         break;
1173
1174                 gvar->mm.mmrover = gvar->mm.mmrover->next;
1175
1176                 if(!gvar->mm.mmrover)
1177                         gvar->mm.mmrover = gvar->mm.mmhead;
1178                 else if(gvar->mm.mmrover == start)
1179                 {
1180                         Quit("MM_SetLock: Block not found!");
1181                         //return;
1182                 }
1183
1184         } while(1);
1185
1186         gvar->mm.mmrover->attributes &= ~LOCKBIT;
1187         gvar->mm.mmrover->attributes |= locked*LOCKBIT;
1188 }
1189
1190 //==========================================================================
1191
1192 /*
1193 =====================
1194 =
1195 = MM_SortMem
1196 =
1197 = Throws out all purgable stuff and compresses movable blocks
1198 =
1199 =====================
1200 */
1201
1202 void MM_SortMem(global_game_variables_t *gvar)
1203 {
1204         //huge mmblocktype huge *scan,huge *last,huge *next;
1205         mmblocktype far *scan,far *last,far *next;
1206         unsigned        start,length,source,dest,oldborder;
1207         int                     playing;
1208
1209         //
1210         // lock down a currently playing sound
1211         //
1212 /*++++  playing = SD_SoundPlaying ();
1213         if(playing)
1214         {
1215                 switch (SoundMode)
1216                 {
1217                 case sdm_PC:
1218                         playing += STARTPCSOUNDS;
1219                         break;
1220                 case sdm_AdLib:
1221                         playing += STARTADLIBSOUNDS;
1222                         break;
1223                 }
1224                 MM_SetLock(&(memptr)audiosegs[playing],true);
1225         }
1226
1227
1228         SD_StopSound();*/
1229 //      oldborder = bordercolor;
1230 //      VW_ColorBorder (15);
1231
1232         if(beforesort)
1233                 beforesort();
1234
1235         scan = gvar->mm.mmhead;
1236
1237         last = NULL;            // shut up compiler warning
1238
1239         while(scan)
1240         {
1241                 if(scan->attributes & LOCKBIT)
1242                 {
1243                 //
1244                 // block is locked, so try to pile later blocks right after it
1245                 //
1246                         start = scan->start + scan->length;
1247                 }
1248                 else
1249                 {
1250                         if(scan->attributes & PURGEBITS)
1251                         {
1252                         //
1253                         // throw out the purgable block
1254                         //
1255                                 next = scan->next;
1256                                 FREEBLOCK(scan);
1257                                 //MM_FreeBlock(scan, gvar);
1258                                 last->next = next;
1259                                 scan = next;
1260                                 continue;
1261                         }
1262                         else
1263                         {
1264                         //
1265                         // push the non purgable block on top of the last moved block
1266                         //
1267                                 if(scan->start != start)
1268                                 {
1269                                         length = scan->length;
1270                                         source = scan->start;
1271                                         dest = start;
1272                                         while(length > 0xf00)
1273                                         {
1274                                                 movedata(source,0,dest,0,0xf00*16);
1275                                                 length -= 0xf00;
1276                                                 source += 0xf00;
1277                                                 dest += 0xf00;
1278                                         }
1279                                         movedata(source,0,dest,0,length*16);
1280
1281                                         scan->start = start;
1282                                         *(unsigned *)scan->useptr = start;
1283                                 }
1284                                 start = scan->start + scan->length;
1285                         }
1286                 }
1287
1288                 last = scan;
1289                 scan = scan->next;              // go to next block
1290         }
1291
1292         gvar->mm.mmrover = gvar->mm.mmhead;
1293
1294         if(aftersort)
1295                 aftersort();
1296
1297 //      VW_ColorBorder (oldborder);
1298
1299 /*++++  if(playing)
1300                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
1301 }
1302
1303 //==========================================================================
1304
1305 /*
1306 =====================
1307 =
1308 = MM_ShowMemory
1309 =
1310 =====================
1311 */
1312
1313 void MM_ShowMemory(global_game_variables_t *gvar)
1314 {
1315         //huge mmblocktype huge *scan;
1316         mmblocktype far *scan;
1317         word temp;
1318         sdword  end,owner;
1319         //word chx,chy;
1320         word w;
1321         //dword wwww;
1322         byte    scratch[160],scratch0[4096],scratch1[160],str[16];
1323         //byte d = '#';
1324 //****  VW_SetDefaultColors();
1325 //****  VW_SetLineWidth(40);
1326 //++++mh        temp = bufferofs;
1327 //++++mh        bufferofs = 0;
1328 //****  VW_SetScreen (0,0);
1329         scan = gvar->mm.mmhead;
1330         end = -1;
1331
1332         CA_OpenDebug (gvar);
1333         w=0;
1334         while(scan)
1335         {
1336                 strcpy(scratch, AARESET);
1337                 if(scan->attributes & PURGEBITS)
1338                         strcpy(scratch0, AAMAGENTA);            // dark purple = purgable
1339                 else
1340                         strcpy(scratch0, AABLUE);               // medium blue = non purgable
1341                 if(scan->attributes & LOCKBIT)
1342                         strcpy(scratch0, AARED);                // red = locked
1343                 if(scan->start<=end)
1344                 {
1345                         printf("\nend==%d\n\n", end);
1346                         strcat(scratch, "MM_ShowMemory: Memory block order currupted!\n");
1347                         strcat(scratch, "End's Size: ");
1348                         ultoa (end,str,10);
1349                         strcat (scratch,str);
1350                         strcat(scratch, "\nscan->start's Size: ");
1351                         ultoa (scan->start,str,10);
1352                         strcat (scratch,str);
1353                         write(gvar->handle.debughandle,scratch,strlen(scratch));
1354                         //modexprint(&page, chx, chy, 1, 0, 24, "\nMM_ShowMemory: Memory block order currupted!\n");
1355                         break;
1356                 }
1357                 end = scan->start+(scan->length)-1;
1358 //++++          chy = scan->start/320;
1359 //++++          chx = scan->start%320;
1360                                 //modexhlin(page, scan->start, (unsigned)end, chy, color);
1361                                 //for(chx=scan->start;chx+4>=(word)end;chx+=4)
1362                                 //{
1363 //++++                                  modexClearRegion(page, chx, chy, 4, 4, color);
1364                                 //}
1365 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1366                 for(w=(scan->start)/80;w<=end/80;w++)
1367                 {
1368                         //printf("+     %u      %lu\n", w, scan->length);
1369                         strcat(scratch0, "+");
1370                 }
1371                 //++==++==optional strcat(scratch0, AARESET); strcat(scratch0, AAGREY); strcat(scratch0,"_");
1372 //++++          VW_Plot(scan->start,0,15);
1373 //++++                          modexClearRegion(page, chx, chy, 4, 4, 15);
1374 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1375
1376                 //wwww=(dword)(scan->next->start)-(dword)scan->start;
1377                 //wwww=(dword)scan->start+(dword)(scan->next->start);
1378                 if (scan->next && scan->next->start >= end+1)
1379                 {
1380                         strcat(scratch0, AARESET);
1381                         //++==++==optional strcat(scratch0, "\n");
1382                         strcat(scratch0,AAGREEN);
1383                         for(w=(end+1)/80;w<=((scan->next->start-scan->start)/80);w++)
1384                         //for(w=(wwww)/80;w<=((end+1)/80);w++)
1385                         //for(w=(end+1)/80;w<=((wwww)/80);w++)
1386                         {
1387                                 //printf("0     %x      %u      %lu\n", scan->next->start, w, scan->length);
1388                                 strcat(scratch0,"0");
1389                         }
1390                         //printf("==================\n");
1391                         //printf("w=%u  wwww=%lu        start=%04x      next=%04x       end=%lu\n", w/80, wwww/80, scan->start, (scan->next->start), end+1);
1392                         //printf("==================\n");
1393                         strcat(scratch0, "\n");
1394                         //getch();
1395                 }/*else {//if(scan->next->start <= scan->start){
1396                         scan->next->start=scan->start+0x1000;
1397                         wwww=(dword)(scan->next->start)-(dword)scan->start;
1398                         strcat(scratch0, AARESET);
1399                         strcat(scratch0, "\n");
1400                         strcat(scratch0,AAGREEN);
1401                         for(w=(end+1);w<=(0x1000/80);w++)
1402                         {
1403                                 //printf("0     %x      %x      %u\n", scan->start, w);
1404                                 strcat(scratch0,"0");
1405                         }
1406                         printf("================\n");
1407                         printf("w=%x    start=%x        next=%x end=%u  %lu\n", w, scan->start, (scan->next->start), end+1, wwww);
1408                         printf("================\n");
1409                         getch();
1410                 }*/
1411                 strcat(scratch0, AARESET);
1412                 //strcat(scratch0,"\n");
1413                         //for(chx=scan->next->start;chx+4>=(word)end+1;chx+=4)
1414                         //{
1415 //                              chx+=scan->next->start;
1416 //                              modexClearRegion(page, chx, chy, 4, 4, 2);
1417                         //}
1418                                         //modexhlin(page, end+1,scan->next->start, chy, 0);
1419 /*              y = scan->start/320;
1420                 x = scan->start%320;
1421                 VW_Hlin(x,x+end,y,color);
1422                 VW_Plot(x,y,15);*/
1423 //++++                  VW_Hlin(x+end+1,x+(scan->next->start-scan->start),y,0); // black = free
1424                 strcat(scratch,"Seg:");
1425                 ultoa (scan->start,str,16);
1426                 strcat (scratch,str);
1427                 strcat (scratch,"\tSize:");
1428                 ultoa ((unsigned)scan->length,str,10);
1429                 strcat (scratch,str);
1430                 strcat (scratch,"\tOwner:0x");
1431                 owner = (unsigned)scan->useptr;
1432                 ultoa (owner,str,16);
1433                 strcat (scratch,str);
1434                 strcat (scratch,"\n");
1435                 write(gvar->handle.debughandle,scratch,strlen(scratch));
1436                 write(gvar->handle.debughandle,scratch0,strlen(scratch0));
1437 //modexprint(page, chx, chy, 1, 0, 24, &scratch);
1438 //++++chy+=4;
1439 //fprintf(stdout, "%s", scratch);
1440
1441                 scan = scan->next;
1442         }
1443         /*strcpy(scratch1, AARESET);
1444         strcat(scratch1, "========================================\n");
1445         strcat(scratch1, "near=  ");
1446         ultoa (*(gvar->mm.nearheap),str,10);
1447         strcat (scratch1,str);
1448         strcat(scratch1, "      far= ");
1449         ultoa (*(gvar->mm.farheap),str,10);
1450         strcat (scratch1,str);
1451         strcat(scratch1, "\n");
1452         //strcat(scratch1, "&near=      %Fp ", &(gvar->mm.nearheap));
1453         //strcat(scratch1, "&far=       %Fp", &(gvar->mm.farheap));
1454         //strcat(scratch1, "\n");
1455         strcat(scratch1, "========================================\n");
1456         write(gvar->handle.debughandle,scratch1,strlen(scratch1));*/
1457
1458
1459         CA_CloseDebug (gvar);
1460
1461 //++++mh        IN_Ack();
1462 //****  VW_SetLineWidth(64);
1463 //++++mh        bufferofs = temp;
1464 }
1465
1466 //==========================================================================
1467
1468 /*
1469 =====================
1470 =
1471 = MM_DumpData
1472 =
1473 =====================
1474 */
1475
1476 void MM_DumpData(global_game_variables_t *gvar)
1477 {
1478         //huge mmblocktype huge *scan,huge *best;
1479         mmblocktype far *scan,far *best;
1480         long    lowest,oldlowest;
1481         word    owner;
1482         byte    lock,purge;
1483         FILE    *dumpfile;
1484
1485         free(gvar->mm.nearheap);
1486 #ifdef __BORLANDC__
1487                 dumpfile = fopen ("mmdump.16b","w");
1488 #endif
1489 #ifdef __WATCOMC__
1490                 dumpfile = fopen ("mmdump.16w","w");
1491 #endif
1492         if (!dumpfile){
1493                 printf("MM_DumpData: Couldn't open MMDUMP.16!\n");
1494                 return;
1495         }
1496
1497         lowest = -1;
1498         do
1499         {
1500                 oldlowest = lowest;
1501                 lowest = 0xffff;
1502
1503                 scan = gvar->mm.mmhead;
1504                 while (scan)
1505                 {
1506                         owner = (unsigned)scan->useptr;
1507
1508                         if (owner && owner<lowest && owner > oldlowest)
1509                         {
1510                                 best = scan;
1511                                 lowest = owner;
1512                         }
1513
1514                         scan = scan->next;
1515                 }
1516
1517                 if (lowest != 0xffff)
1518                 {
1519                         if (best->attributes & PURGEBITS)
1520                                 purge = 'P';
1521                         else
1522                                 purge = '-';
1523                         if (best->attributes & LOCKBIT)
1524                                 lock = 'L';
1525                         else
1526                                 lock = '-';
1527                         fprintf (dumpfile,"0x%p (%c%c) = %u\n"
1528                         ,(unsigned)lowest,lock,purge,best->length);
1529                 }
1530
1531         } while (lowest != 0xffff);
1532
1533         fclose(dumpfile);
1534         printf("MMDUMP.16 created.\n");
1535 }
1536
1537 //==========================================================================
1538
1539
1540 /*
1541 ======================
1542 =
1543 = MM_UnusedMemory
1544 =
1545 = Returns the total free space without purging
1546 =
1547 ======================
1548 */
1549
1550 dword MM_UnusedMemory(global_game_variables_t *gvar)
1551 {
1552         dword free;
1553         //huge mmblocktype huge *scan;
1554         mmblocktype far *scan;
1555
1556         free = 0;
1557         scan = gvar->mm.mmhead;
1558
1559         while(scan->next)
1560         {
1561                 free += scan->next->start - (scan->start + scan->length);
1562                 scan = scan->next;
1563         }
1564
1565         return free*16lu;
1566 //      return free;
1567 }
1568
1569 //==========================================================================
1570
1571
1572 /*
1573 ======================
1574 =
1575 = MM_TotalFree
1576 =
1577 = Returns the total free space with purging
1578 =
1579 ======================
1580 */
1581
1582 dword MM_TotalFree(global_game_variables_t *gvar)
1583 {
1584         dword free;
1585         //huge mmblocktype huge *scan;
1586         mmblocktype far *scan;
1587
1588         free = 0;
1589         scan = gvar->mm.mmhead;
1590
1591         while(scan->next)
1592         {
1593                 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1594                         free += scan->length;
1595                 free += scan->next->start - (scan->start + scan->length);
1596                 scan = scan->next;
1597         }
1598
1599         return free*16lu;
1600 //      return free;
1601 }
1602
1603 //==========================================================================
1604
1605 /*
1606 =====================
1607 =
1608 = MM_Report
1609 =
1610 =====================
1611 */
1612
1613 void MM_Report_(global_game_variables_t *gvar)
1614 {
1615         printf("========================================\n");
1616         printf("                MM_Report_\n");
1617         printf("========================================\n");
1618         if(MML_CheckForEMS())
1619         {
1620                 printf("        LIMEMS\n");
1621                 printf("                EMM v%x.%x available\n", gvar->pm.emm.EMSVer>>4,gvar->pm.emm.EMSVer&0x0F);
1622                 printf("                totalEMSpages:  %u      ", gvar->pm.emm.totalEMSpages); printf("freeEMSpages:   %u\n", gvar->pm.emm.freeEMSpages);
1623                 printf("                EMSPageFrame:   %x\n", gvar->pm.emm.EMSPageFrame);
1624         }
1625         if(MML_CheckForXMS(gvar))
1626         {
1627                 printf("        XMS\n");
1628                 printf("                XMSDriver:      %X\n", XMSDriver);
1629         }
1630         printf("nearheap:       %lu             ", gvar->mmi.nearheap); printf("farheap:        %lu\n", gvar->mmi.farheap);
1631         if(MML_CheckForEMS()) printf("EMSmem:           %lu     ", gvar->mmi.EMSmem); if(MML_CheckForXMS(gvar)) printf("XMSmem:         %lu", gvar->mmi.XMSmem); printf("\n");
1632         printf("convmem:\n"); DebugMemory_(gvar, 0);
1633         //printf("mainmem:      %lu\n", gvar->mmi.mainmem);
1634         //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);
1635         //printf("                      UnusedMemory:   %lu\n", MM_UnusedMemory(gvar));
1636
1637 }
1638
1639 //==========================================================================
1640
1641 /*
1642 =====================
1643 =
1644 = MM_EMSerr
1645 =
1646 =====================
1647 */
1648
1649 void MM_EMSerr(byte *stri, byte err)
1650 {
1651         //Returns a text string describing the error code in EMS.Error.
1652         switch(err)
1653         {
1654                 case 0x0:
1655                         strcat(stri, "successful");
1656                 break;
1657                 case 0x80:
1658                         strcat(stri, "internal error");
1659                 break;
1660                 case 0x81:
1661                         strcat(stri, "hardware malfunction");
1662                 break;
1663                 case 0x82:
1664                         strcat(stri, "busy .. retry later");
1665                 break;
1666                 case 0x83:
1667                         strcat(stri, "invalid handle");
1668                 break;
1669                 case 0x84:
1670                         strcat(stri, "undefined function requested by application");
1671                 break;
1672                 case 0x85:
1673                         strcat(stri, "no more handles available");
1674                 break;
1675                 case 0x86:
1676                         strcat(stri, "error in save or restore of mapping context");
1677                 break;
1678                 case 0x87:
1679                         strcat(stri, "insufficient memory pages in system");
1680                 break;
1681                 case 0x88:
1682                         strcat(stri, "insufficient memory pages available");
1683                 break;
1684                 case 0x89:
1685                         strcat(stri, "zero pages requested");
1686                 break;
1687                 case 0x8A:
1688                         strcat(stri, "invalid logical page number encountered");
1689                 break;
1690                 case 0x8B:
1691                         strcat(stri, "invalid physical page number encountered");
1692                 break;
1693                 case 0x8C:
1694                         strcat(stri, "page-mapping hardware state save area is full");
1695                 break;
1696                 case 0x8D:
1697                         strcat(stri, "save of mapping context failed");
1698                 break;
1699                 case 0x8E:
1700                         strcat(stri, "restore of mapping context failed");
1701                 break;
1702                 case 0x8F:
1703                         strcat(stri, "undefined subfunction");
1704                 break;
1705                 case 0x90:
1706                         strcat(stri, "undefined attribute type");
1707                 break;
1708                 case 0x91:
1709                         strcat(stri, "feature not supported");
1710                 break;
1711                 case 0x92:
1712                         strcat(stri, "successful, but a portion of the source region has been overwritten");
1713                 break;
1714                 case 0x93:
1715                         strcat(stri, "length of source or destination region exceeds length of region allocated to either source or destination handle");
1716                 break;
1717                 case 0x94:
1718                         strcat(stri, "conventional and expanded memory regions overlap");
1719                 break;
1720                 case 0x95:
1721                         strcat(stri, "offset within logical page exceeds size of logical page");
1722                 break;
1723                 case 0x96:
1724                         strcat(stri, "region length exceeds 1 MB");
1725                 break;
1726                 case 0x97:
1727                         strcat(stri, "source and destination EMS regions have same handle and overlap");
1728                 break;
1729                 case 0x98:
1730                         strcat(stri, "memory source or destination type undefined");
1731                 break;
1732                 case 0x9A:
1733                         strcat(stri, "specified alternate map register or DMA register set not supported");
1734                 break;
1735                 case 0x9B:
1736                         strcat(stri, "all alternate map register or DMA register sets currently allocated");
1737                 break;
1738                 case 0x9C:
1739                         strcat(stri, "alternate map register or DMA register sets not supported");
1740                 break;
1741                 case 0x9D:
1742                         strcat(stri, "undefined or unallocated alternate map register or DMA register set");
1743                 break;
1744                 case 0x9E:
1745                         strcat(stri, "dedicated DMA channels not supported");
1746                 break;
1747                 case 0x9F:
1748                         strcat(stri, "specified dedicated DMA channel not supported");
1749                 break;
1750                 case 0xA0:
1751                         strcat(stri, "no such handle name");
1752                 break;
1753                 case 0xA1:
1754                         strcat(stri, "a handle found had no name, or duplicate handle name");
1755                 break;
1756                 case 0xA2:
1757                         strcat(stri, "attempted to wrap around 1M conventional address space");
1758                 break;
1759                 case 0xA3:
1760                         strcat(stri, "source array corrupted");
1761                 break;
1762                 case 0xA4:
1763                         strcat(stri, "operating system denied access");
1764                 break;
1765                 default:
1766                         strcat(stri, "undefined error");
1767         }
1768 }
1769
1770 //==========================================================================
1771
1772 /*
1773 =====================
1774 =
1775 = MM_BombOnError
1776 =
1777 =====================
1778 */
1779
1780 void MM_BombOnError(boolean bomb, global_game_variables_t *gvar)
1781 {
1782         gvar->mm.bombonerror = bomb;
1783 }
1784
1785 /*void MM_GetNewBlock(global_game_variables_t *gvar)
1786 {
1787         if(!gvar->mm.mmfree)
1788                 MML_ClearBlock(gvar);
1789         gvar->mm.mmnew=gvar->mm.mmfree;
1790         gvar->mm.mmfree=gvar->mm.mmfree->next;
1791         if(!(gvar->mm.mmnew=gvar->mm.mmfree))
1792         {
1793                 printf("MM_GETNEWBLOCK: No free blocks!\n");
1794                 return;
1795         }
1796         gvar->mm.mmfree=gvar->mm.mmfree->next;
1797 }
1798
1799 void MM_FreeBlock(mmblocktype *x, global_game_variables_t *gvar)
1800 {
1801         x->useptr=NULL;
1802         x->next=gvar->mm.mmfree;
1803         gvar->mm.mmfree=x;
1804 }*/
1805
1806 /*void MM_seguin(void)
1807 {
1808         __asm {
1809                 push    ds
1810                 mov     ax,ds
1811                 inc             ax
1812                 mov     ds,ax
1813         }
1814 }
1815
1816 void MM_segude(void)
1817 {
1818         __asm {
1819                 pop ds
1820         }
1821 }*/
1822
1823 /*
1824 pull data from far and put it into ds var
1825 mov ax,es:si
1826 mov x,ax
1827 */
1828 /*
1829 ss stack segment
1830 sp top of stack
1831 bp bottem of stack
1832 */