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