src/lib/16_mm.c

   1 /* Catacomb Apocalypse Source Code
   2  * Copyright (C) 1993-2014 Flat Rock Software
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 // NEWMM.C
  20
  21 /*
  22 =============================================================================
  23
  24                         ID software memory manager
  25                         --------------------------
  26
  27 Primary coder: John Carmack
  28
  29 RELIES ON
  30 ---------
  31 Quit (char *error) function
  32
  33
  34 WORK TO DO
  35 ----------
  36 MM_SizePtr to change the size of a given pointer
  37
  38 Multiple purge levels utilized
  39
  40 EMS / XMS unmanaged routines
  41
  42 =============================================================================
  43 */
  44 /*
  45
  46 Open Watcom port by sparky4
  47
  48 */
  49 #include "src/lib/16_mm.h"
  50 #include "src/lib/16_ca.h"
  51 #pragma hdrstop
  52
  53 #pragma warn -pro
  54 #pragma warn -use
  55
  56 /*
  57 =============================================================================
  58
  59                                                  GLOBAL VARIABLES
  60
  61 =============================================================================
  62 */
  63
  64 void            (* beforesort) (void);
  65 void            (* aftersort) (void);
  66 void            (* XMSaddr) (void);             // far pointer to XMS driver
  67
  68 /*
  69 =============================================================================
  70
  71                                                  LOCAL VARIABLES
  72
  73 =============================================================================
  74 */
  75
  76 static  char *ParmStringsexmm[] = {"noems","noxms",""};
  77
  78 /*
  79 ======================
  80 =
  81 = MML_CheckForEMS
  82 =
  83 = Routine from p36 of Extending DOS
  84 =
  85 =======================
  86 */
  87
  88 boolean MML_CheckForEMS(void)
  89 {
  90         boolean emmcfems;
  91         static char     emmname[] = "EMMXXXX0"; //fix by andrius4669
  92         __asm {
  93                 mov     dx,OFFSET emmname       //fix by andrius4669
  94                 mov     ax,0x3d00
  95                 int     0x21            // try to open EMMXXXX0 device
  96                 jc      error
  97
  98                 mov     bx,ax
  99                 mov     ax,0x4400
 100
 101                 int     0x21            // get device info
 102                 jc      error
 103
 104                 and     dx,0x80
 105                 jz      error
 106
 107                 mov     ax,0x4407
 108
 109                 int     0x21            // get status
 110                 jc      error
 111                 or      al,al
 112                 jz      error
 113
 114                 mov     ah,0x3e
 115                 int     0x21            // close handle
 116                 jc      error
 117                 //
 118                 // EMS is good
 119                 //
 120                 mov     emmcfems,1
 121                 jmp End
 122 #ifdef __BORLANDC__
 123         }
 124 #endif
 125                 error:
 126 #ifdef __BORLANDC__
 127         __asm {
 128 #endif
 129                 //
 130                 // EMS is bad
 131                 //
 132                 mov     emmcfems,0
 133 #ifdef __BORLANDC__
 134         }
 135 #endif
 136                 End:
 137 #ifdef __WATCOMC__
 138         }
 139 #endif
 140         return(emmcfems);
 141 }
 142
 143 #ifndef __16_PM__
 144 /*
 145 ======================
 146 =
 147 = MML_SetupEMS
 148 =
 149 =======================
 150 */
 151
 152 byte MML_SetupEMS(global_game_variables_t *gvar)
 153 {
 154         byte    str[160];
 155         byte    err;
 156         boolean errorflag=false;
 157
 158         unsigned int EMSVer = 0;
 159         //byte  EMS_status;
 160         unsigned        totalEMSpages,freeEMSpages,EMSPageFrame,EMSpagesmapped,EMSHandle;
 161         totalEMSpages = freeEMSpages = EMSPageFrame = EMSpagesmapped = 0;
 162
 163         __asm {
 164                 mov     ah,EMS_STATUS
 165                 int     EMS_INT                                         // make sure EMS hardware is present
 166                 or      ah,ah
 167                 //mov   [EMS_status],ah
 168                 jnz     error
 169
 170                 mov     ah,EMS_VERSION
 171                 int     EMS_INT
 172                 or      ah,ah
 173                 jnz     error
 174                 mov     [EMSVer],ax                             //      set EMSVer
 175                 cmp     al,0x32                                         // only work on ems 3.2 or greater
 176                 jb      error
 177
 178                 mov     ah,EMS_GETFRAME
 179                 int     EMS_INT                                         // find the page frame address
 180                 or      ah,ah
 181                 jnz     error
 182                 mov     [EMSPageFrame],bx
 183
 184                 mov     ah,EMS_GETPAGES
 185                 int     EMS_INT                                         // find out how much EMS is there
 186                 or      ah,ah
 187                 jnz     error
 188                 mov     [totalEMSpages],dx
 189                 mov     [freeEMSpages],bx
 190                 or      bx,bx
 191                 jz      noEMS                                           // no EMS at all to allocate
 192                                                                                         //EXPAND DONG!!!!
 193                 cmp     [EMSVer],0x40
 194                 jb      low
 195                 cmp     bx,[freeEMSpages]
 196                 jle     getpages
 197                 mov     bx,[freeEMSpages]
 198                 jmp     getpages
 199 #ifdef __BORLANDC__
 200         }
 201 #endif
 202         low:
 203 #ifdef __BORLANDC__
 204         __asm {
 205 #endif
 206                 cmp     bx,4
 207                 jle     getpages                                        // there is only 1,2,3,or 4 pages
 208                 mov     bx,4                                            // we can't use more than 4 pages
 209 #ifdef __BORLANDC__
 210         }
 211 #endif
 212         getpages:
 213 #ifdef __BORLANDC__
 214         __asm {
 215 #endif
 216                 mov     [EMSpagesmapped],bx
 217                 mov     ah,EMS_ALLOCPAGES                       // allocate up to 64k of EMS
 218                 int     EMS_INT
 219                 or      ah,ah
 220                 jnz     error
 221                 mov     [EMSHandle],dx
 222                 jmp End
 223 #ifdef __BORLANDC__
 224         }
 225 #endif
 226         error:
 227 #ifdef __BORLANDC__
 228         __asm {
 229 #endif
 230                 mov     err,ah
 231                 mov     errorflag,1
 232                 jmp End
 233 #ifdef __BORLANDC__
 234         }
 235 #endif
 236 noEMS:
 237 End:
 238 #ifdef __WATCOMC__
 239         }
 240 #endif
 241         if(errorflag==true)
 242         {
 243                 strcpy(str,"MM_SetupEMS: EMS error ");
 244                 MM_EMSerr(str, err);
 245                 printf("%s\n",str);
 246                 return err;
 247         }
 248         gvar->mm.totalEMSpages=totalEMSpages;
 249         gvar->mm.freeEMSpages=freeEMSpages;
 250         gvar->mm.EMSPageFrame=EMSPageFrame;
 251         gvar->mm.EMSpagesmapped=EMSpagesmapped;
 252         gvar->mm.EMSHandle=EMSHandle;
 253         gvar->mm.EMSVer=EMSVer;
 254         return 0;
 255 }
 256
 257
 258 /*
 259 ======================
 260 =
 261 = MML_ShutdownEMS
 262 =
 263 =======================
 264 */
 265
 266 void MML_ShutdownEMS(global_game_variables_t *gvar)
 267 {
 268         boolean errorflag=false;
 269         unsigned EMSHandle=gvar->mm.EMSHandle;
 270
 271         if(!EMSHandle)
 272                 return;
 273         __asm {
 274                 mov     ah,EMS_FREEPAGES
 275                 mov     dx,[EMSHandle]
 276                 int     EMS_INT
 277                 or      ah,ah
 278                 jz      ok
 279                 mov     errorflag,1
 280 #ifdef __BORLANDC__
 281         }
 282 #endif
 283                 ok:
 284 #ifdef __WATCOMC__
 285         }
 286 #endif
 287         if(errorflag==true)
 288                 Quit("MML_ShutdownEMS: Error freeing EMS!\n");  //++++ add something
 289 }
 290
 291 /*
 292 ====================
 293 =
 294 = MM_MapEMS
 295 =
 296 = Maps the 64k of EMS used by memory manager into the page frame
 297 = for general use.  This only needs to be called if you are keeping
 298 = other things in EMS.
 299 =
 300 ====================
 301 */
 302
 303 byte MM_MapEMS(global_game_variables_t *gvar)
 304 {
 305         byte    str[160];
 306         unsigned        EMSHandle;
 307         byte err;
 308         boolean errorflag=false;
 309         int     i;
 310         EMSHandle=gvar->mm.EMSHandle;
 311
 312         for (i=0;i<4/*MAPPAGES*/;i++)
 313         {
 314                 __asm {
 315                         mov     ah,EMS_MAPPAGE
 316                         mov     bx,[i]                  // logical page
 317                         mov     al,bl                   // physical page
 318                         mov     dx,[EMSHandle]  // handle
 319                         int     EMS_INT
 320                         or      ah,ah
 321                         jnz     error
 322                         jmp End
 323 #ifdef __BORLANDC__
 324                 }
 325 #endif
 326                         error:
 327 #ifdef __BORLANDC__
 328                 __asm {
 329 #endif
 330                         mov     err,ah
 331                         mov     errorflag,1
 332 #ifdef __BORLANDC__
 333                 }
 334 #endif
 335                         End:
 336 #ifdef __WATCOMC__
 337                 }
 338 #endif
 339                 if(errorflag==true)
 340                 {
 341                         strcpy(str,"MM_MapEMS: EMS error ");
 342                         MM_EMSerr(str, err);
 343                         printf("%s\n",str);
 344                         return err;
 345                 }
 346         }
 347         gvar->mmi.EMSmem = (i)*0x4000lu;
 348         return 0;
 349 }
 350
 351 byte MM_MapXEMS(global_game_variables_t *gvar)
 352 {
 353 //SUB EMS.MapXPages (PhysicalStart, LogicalStart, NumPages, Handle)
 354
 355         //Maps up to 4 logical EMS pages to physical pages in the page frame, where:
 356         //PhysicalStart = Physical page first logical page is mapped to
 357         //LogicalStart  = First logical page to map
 358         //NumPages      = Number of pages to map (1 to 4)
 359         //Handle        = EMS handle logical pages are allocated to
 360
 361   /*//Create a buffer containing the page information
 362 //  FOR x = 0 TO NumPages - 1
 363 //    MapInfo$ = MapInfo$ + MKI$(LogicalStart + x) + MKI$(PhysicalStart + x)
 364 //  NEXT*/
 365
 366 //  Regs.ax = 0x5000                           //Map the pages in the buffer
 367 //  Regs.cx = NumPages                         //to the pageframe
 368 //  Regs.dx = Handle
 369 //  Regs.ds = VARSEG(MapInfo$)
 370 //  Regs.si = SADD(MapInfo$)
 371 //  InterruptX 0x67, Regs, Regs
 372 //      EMS.Error = (Regs.ax AND 0xFF00&) \ 0x100  //Store the status code
 373
 374 //END SUB
 375         byte    str[160];
 376         byte err;
 377         word    EMSHandle;
 378         boolean errorflag=false;
 379         int     i;
 380         EMSHandle=gvar->mm.EMSHandle;
 381
 382         if(gvar->mm.EMSVer<0x40)
 383                 return 5;
 384
 385         for (i=0;i<MAPPAGES;i++)
 386         {
 387                 __asm {
 388                         mov     ah,EMS_MAPXPAGE
 389                         mov     cx,[i]                  // logical page
 390                         mov     al,bl                   // physical page
 391                         mov     dx,[EMSHandle]  // handle
 392                         int     EMS_INT
 393                         or      ah,ah
 394                         jnz     error
 395                         jmp End
 396 #ifdef __BORLANDC__
 397                 }
 398 #endif
 399                         error:
 400 #ifdef __BORLANDC__
 401                 __asm {
 402 #endif
 403                         mov     err,ah
 404                         mov     errorflag,1
 405 #ifdef __BORLANDC__
 406                 }
 407 #endif
 408                         End:
 409 #ifdef __WATCOMC__
 410                 }
 411 #endif
 412                 if(errorflag==true)
 413                 {
 414                         //strcpy(str,"MM_MapXEMS: EMS error 0x");
 415                         strcpy(str,"MM_MapXEMS: EMS error ");
 416                         //itoa(err,str2,16);
 417                         MM_EMSerr(str, err);
 418                         printf("%s\n",str);
 419                         //printf("%s%x\n",str, err);
 420                         //printf("FACK! %x\n", err);
 421                         return err;
 422                 }
 423         }
 424         gvar->mmi.EMSmem = (i)*0x4000lu;
 425         return 0;
 426 }
 427 #endif
 428 //==========================================================================
 429
 430 /*
 431 ======================
 432 =
 433 = MML_CheckForXMS
 434 =
 435 = Check for XMM driver
 436 =
 437 =======================
 438 */
 439
 440 boolean MML_CheckForXMS(void)
 441 {
 442         //numUMBs = 0;
 443         boolean errorflag=false;
 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                 gvar->mm.mmblocks[i].next = &(gvar->mm.mmblocks[i+1]);
 774         gvar->mm.mmblocks[i].next = NULL;
 775
 776 //
 777 // locked block of all memory until we punch out free space
 778 //
 779         GETNEWBLOCK;
 780         gvar->mm.mmhead = gvar->mm.mmnew;                               // this will allways be the first node
 781         gvar->mm.mmnew->start = 0;
 782         gvar->mm.mmnew->length = 0xffff;
 783         gvar->mm.mmnew->attributes = LOCKBIT;
 784         gvar->mm.mmnew->next = NULL;
 785         //gvar->mm.mmnew->useptr = peeonself;
 786         gvar->mm.mmrover = gvar->mm.mmhead;
 787
 788         //printf("              %x\n", peeonself);
 789         //printf("              %x\n", *peeonself);
 790 //
 791 // get all available near conventional memory segments
 792 //
 793 #ifdef __WATCOMC__
 794         _nheapgrow();
 795         length=(dword)_memavl();//(dword)GetFreeSize();
 796         //huge start = (void huge *)(gvar->mm.nearheap = _nmalloc(length));
 797         start = (void far *)(gvar->mm.nearheap = _nmalloc(length));
 798 #endif
 799 #ifdef __BORLANDC__
 800         length=coreleft();
 801         //huge start = (void huge *)(gvar->mm.nearheap = malloc(length));
 802         start = (void far *)(gvar->mm.nearheap = malloc(length));
 803 #endif
 804         length -= 16-(FP_OFF(start)&15);
 805         length -= SAVENEARHEAP;
 806         seglength = length / 16;                        // now in paragraphs
 807         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 808         MML_UseSpace(segstart,seglength, gvar);
 809         gvar->mmi.nearheap = length;
 810         //printf("start=%Fp     segstart=%x     seglen=%lu      len=%lu\n", start, segstart, seglength, length);
 811
 812 //
 813 // get all available far conventional memory segments
 814 //
 815         //printf("_FARCORELEFT                          %lu\n", _FCORELEFT);
 816 #ifdef __WATCOMC__
 817         _fheapgrow();
 818         length=_FCORELEFT;//_fcoreleft();//(dword)GetFarFreeSize();//0xffffUL*4UL;
 819 #endif
 820 #ifdef __BORLANDC__
 821         printf("farcoreleft()                           %lu\n", farcoreleft());
 822         printf("(farcoreleft()+32)-_FCORELEFT   %d\n", (sword)((farcoreleft()+32)-_FCORELEFT));
 823         length=farcoreleft();//_fcoreleft();//(dword)GetFarFreeSize();//0xffffUL*4UL;
 824 #endif
 825         start = gvar->mm.farheap = _fmalloc(length);
 826         //start = gvar->mm.farheap = halloc(length, 1);
 827         length -= 16-(FP_OFF(start)&15);
 828         length -= SAVEFARHEAP;
 829         seglength = length / 16;                        // now in paragraphs
 830         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 831         MML_UseSpace(segstart,seglength, gvar);
 832         gvar->mmi.farheap = length;
 833         //printf("start=%Fp     segstart=%x     seglen=%lu      len=%lu\n", start, segstart, seglength, length);
 834
 835         gvar->mmi.mainmem = gvar->mmi.nearheap + gvar->mmi.farheap;
 836
 837 #ifndef __16_PM__
 838         if(!dbg_debugpm) {
 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 < _argc;i++)
 845         {
 846                 if(US_CheckParm(_argv[i],ParmStringsexmm) == 0)
 847                         goto emsskip;                           // param NOEMS
 848         }
 849         if(MML_CheckForEMS())
 850         {
 851                 MML_SetupEMS(gvar);                                     // allocate space
 852                 //16_PM: EMS4! AND EMS 3.2 MASSIVE DATA HANDLMENT!
 853                 MML_UseSpace(gvar->mm.EMSPageFrame,(MAPPAGES)*0x4000lu, gvar);
 854                 //if(gvar->pm.emm.EMSVer<0x40)
 855                         MM_MapEMS(gvar);                                        // map in used pages
 856                 //else
 857                         //MM_MapXEMS(gvar);                                     // map in used pages
 858         }
 859
 860 //
 861 // detect XMS and get upper memory blocks
 862 //
 863 emsskip:
 864         gvar->mmi.XMSmem = 0;
 865 goto xmsskip;//0000
 866         for(i = 1;i < _argc;i++)
 867         {
 868                 if(US_CheckParm( _argv[i],ParmStringsexmm) == 0)
 869                         goto xmsskip;                           // param NOXMS
 870         }
 871         if(MML_CheckForXMS())
 872         {
 873                 MML_SetupXMS(gvar);                                     // allocate as many UMBs as possible
 874         }
 875
 876         }
 877 xmsskip:
 878 #endif
 879 //
 880 // allocate the misc buffer
 881 //
 882         gvar->mm.mmrover = gvar->mm.mmhead;             // start looking for space after low block
 883
 884         MM_GetPtr(&(gvar->mm.bufferseg),BUFFERSIZE, gvar);
 885 }
 886
 887 //==========================================================================
 888
 889 /*
 890 ====================
 891 =
 892 = MM_Shutdown
 893 =
 894 = Frees all conventional, EMS, and XMS allocated
 895 =
 896 ====================
 897 */
 898
 899 void MM_Shutdown(global_game_variables_t *gvar)
 900 {
 901         if(!(gvar->mm.mmstarted))
 902                 return;
 903
 904         _ffree(gvar->mm.farheap);//     printf("                far freed\n");
 905 #ifdef __WATCOMC__
 906         _nfree(gvar->mm.nearheap);//    printf("                near freed\n");
 907 #endif
 908 #ifdef __BORLANDC__
 909         free(gvar->mm.nearheap);//      printf("                near freed\n");
 910 #endif
 911 #ifndef __16_PM__
 912 #ifdef __DEBUG__
 913         if(!dbg_debugpm) {
 914 #endif
 915         if(MML_CheckForEMS()){ MML_ShutdownEMS(gvar); }//printf("               EMS freed\n"); }
 916         if(MML_CheckForXMS()){ MML_ShutdownXMS(gvar); }//printf("               XMS freed\n"); }
 917 #ifdef __DEBUG__
 918         }
 919 #endif
 920 #endif
 921 }
 922
 923 //==========================================================================
 924
 925 /*
 926 ====================
 927 =
 928 = MM_GetPtr
 929 =
 930 = Allocates an unlocked, unpurgable block
 931 =
 932 ====================
 933 */
 934
 935 void MM_GetPtr (memptr *baseptr, dword size, global_game_variables_t *gvar)
 936 {
 937         //huge mmblocktype huge *scan,huge *lastscan,huge *endscan,huge *purge,huge *next;
 938         mmblocktype far *scan,far *lastscan,far *endscan,far *purge,far *next;
 939         int                     search;
 940         unsigned        needed,startseg;
 941
 942         needed = (size+15)/16;          // convert size from bytes to paragraphs
 943
 944         GETNEWBLOCK;                            // fill in start and next after a spot is found
 945         gvar->mm.mmnew->length = needed;
 946         gvar->mm.mmnew->useptr = baseptr;
 947         //if(gvar->mm.mmnew->useptr==NULL){
 948 #ifdef __DEBUG_MM__
 949                 printf("MM_GetPtr\n");
 950                 //%04x
 951                 printf("        baseptr=%Fp     ", baseptr); printf("useptr=%Fp\n", gvar->mm.mmnew->useptr);
 952                 printf("        *baseptr=%Fp    ", *baseptr); printf("*useptr=%Fp\n", *(gvar->mm.mmnew->useptr));
 953                 printf("        &baseptr=%Fp    ", &baseptr); printf("&useptr=%Fp\n", &(gvar->mm.mmnew->useptr));
 954 #endif
 955         //exit(-5); }
 956         gvar->mm.mmnew->attributes = BASEATTRIBUTES;
 957
 958 //tryagain:
 959         for (search = 0; search<3; search++)
 960         {
 961         //
 962         // first search:        try to allocate right after the rover, then on up
 963         // second search:       search from the head pointer up to the rover
 964         // third search:        compress memory, then scan from start
 965                 if (search == 1 && gvar->mm.mmrover == gvar->mm.mmhead)
 966                         search++;
 967
 968                 switch (search)
 969                 {
 970                 case 0:
 971                         lastscan = gvar->mm.mmrover;
 972                         scan = gvar->mm.mmrover->next;
 973                         endscan = NULL;
 974                         break;
 975                 case 1:
 976                         lastscan = gvar->mm.mmhead;
 977                         scan = gvar->mm.mmhead->next;
 978                         endscan = gvar->mm.mmrover;
 979                         break;
 980                 case 2:
 981                         MM_SortMem (gvar);
 982                         lastscan = gvar->mm.mmhead;
 983                         scan = gvar->mm.mmhead->next;
 984                         endscan = NULL;
 985                         break;
 986                 }
 987
 988                 startseg = lastscan->start + lastscan->length;
 989
 990                 while (scan != endscan)
 991                 {
 992                         if (scan->start - startseg >= needed)
 993                         {
 994                         //
 995                         // got enough space between the end of lastscan and
 996                         // the start of scan, so throw out anything in the middle
 997                         // and allocate the new block
 998                         //
 999                                 purge = lastscan->next;
1000                                 lastscan->next = gvar->mm.mmnew;
1001                                 gvar->mm.mmnew->start = *(unsigned *)baseptr = startseg;
1002                                 gvar->mm.mmnew->next = scan;
1003                                 while ( purge != scan)
1004                                 {       // free the purgable block
1005                                         next = purge->next;
1006                                         FREEBLOCK(purge);
1007                                         purge = next;           // purge another if not at scan
1008                                 }
1009                                 gvar->mm.mmrover = gvar->mm.mmnew;
1010                                 return; // good allocation!
1011                         }
1012
1013                         //
1014                         // if this block is purge level zero or locked, skip past it
1015                         //
1016                         if ( (scan->attributes & LOCKBIT)
1017                                 || !(scan->attributes & PURGEBITS) )
1018                         {
1019                                 lastscan = scan;
1020                                 startseg = lastscan->start + lastscan->length;
1021                         }
1022
1023
1024                         scan=scan->next;                // look at next line
1025                 }
1026         }
1027
1028         if (gvar->mm.bombonerror)
1029         {
1030 #ifdef __WATCOMC__
1031                 //heapdump();
1032 #endif
1033                 printf(OUT_OF_MEM_MSG,(size-gvar->mmi.nearheap));
1034                 printf("for stability reasons the program will shut down! wwww\n");
1035                 MM_Shutdown(gvar);
1036                 exit(-1);
1037         }
1038         else
1039                 gvar->mm.mmerror = true;
1040 }
1041
1042 //==========================================================================
1043
1044 /*
1045 ====================
1046 =
1047 = MM_FreePtr
1048 =
1049 = Allocates an unlocked, unpurgable block
1050 =
1051 ====================
1052 */
1053
1054 void MM_FreePtr(memptr *baseptr, global_game_variables_t *gvar)
1055 {
1056         //huge mmblocktype huge *scan,huge *last;
1057         mmblocktype far *scan,far *last;
1058
1059         last = gvar->mm.mmhead;
1060         scan = last->next;
1061
1062         if(baseptr == gvar->mm.mmrover->useptr) // removed the last allocated block
1063                 gvar->mm.mmrover = gvar->mm.mmhead;
1064
1065         while(scan->useptr != baseptr && scan)
1066         {
1067                 last = scan;
1068                 scan = scan->next;
1069         }
1070
1071         if(!scan)
1072         {
1073                 printf("MM_FreePtr: Block not found!\n");
1074                 return;
1075         }
1076
1077         last->next = scan->next;
1078
1079         FREEBLOCK(scan);
1080 }
1081 //==========================================================================
1082
1083 /*
1084 =====================
1085 =
1086 = MM_SetPurge
1087 =
1088 = Sets the purge level for a block (locked blocks cannot be made purgable)
1089 =
1090 =====================
1091 */
1092
1093
1094 void MM_SetPurge(memptr *baseptr, int purge, global_game_variables_t *gvar)
1095 {
1096         //huge mmblocktype huge *start;
1097         mmblocktype far *start;
1098
1099         start = gvar->mm.mmrover;
1100
1101         do
1102         {
1103                 if(gvar->mm.mmrover->useptr == baseptr)
1104                         break;
1105
1106                 gvar->mm.mmrover = gvar->mm.mmrover->next;
1107
1108                 if(!gvar->mm.mmrover)
1109                         gvar->mm.mmrover = gvar->mm.mmhead;
1110                 else if(gvar->mm.mmrover == start)
1111                 {
1112                         Quit("MM_SetPurge: Block not found!");
1113                         //return;
1114                 }
1115
1116         } while(1);
1117
1118         gvar->mm.mmrover->attributes &= ~PURGEBITS;
1119         gvar->mm.mmrover->attributes |= purge;
1120 }
1121
1122 //==========================================================================
1123
1124 /*
1125 =====================
1126 =
1127 = MM_SetLock
1128 =
1129 = Locks / unlocks the block
1130 =
1131 =====================
1132 */
1133
1134 void MM_SetLock(memptr *baseptr, boolean locked, global_game_variables_t *gvar)
1135 {
1136         //huge mmblocktype huge *start;
1137         mmblocktype far *start;
1138
1139         start = gvar->mm.mmrover;
1140
1141         do
1142         {
1143                 if(gvar->mm.mmrover->useptr == baseptr)
1144                         break;
1145
1146                 gvar->mm.mmrover = gvar->mm.mmrover->next;
1147
1148                 if(!gvar->mm.mmrover)
1149                         gvar->mm.mmrover = gvar->mm.mmhead;
1150                 else if(gvar->mm.mmrover == start)
1151                 {
1152                         Quit("MM_SetLock: Block not found!");
1153                         //return;
1154                 }
1155
1156         } while(1);
1157
1158         gvar->mm.mmrover->attributes &= ~LOCKBIT;
1159         gvar->mm.mmrover->attributes |= locked*LOCKBIT;
1160 }
1161
1162 //==========================================================================
1163
1164 /*
1165 =====================
1166 =
1167 = MM_SortMem
1168 =
1169 = Throws out all purgable stuff and compresses movable blocks
1170 =
1171 =====================
1172 */
1173
1174 void MM_SortMem(global_game_variables_t *gvar)
1175 {
1176         //huge mmblocktype huge *scan,huge *last,huge *next;
1177         mmblocktype far *scan,far *last,far *next;
1178         unsigned        start,length,source,dest,oldborder;
1179         int                     playing;
1180
1181         //
1182         // lock down a currently playing sound
1183         //
1184 /*++++  playing = SD_SoundPlaying ();
1185         if(playing)
1186         {
1187                 switch (SoundMode)
1188                 {
1189                 case sdm_PC:
1190                         playing += STARTPCSOUNDS;
1191                         break;
1192                 case sdm_AdLib:
1193                         playing += STARTADLIBSOUNDS;
1194                         break;
1195                 }
1196                 MM_SetLock(&(memptr)audiosegs[playing],true);
1197         }
1198
1199
1200         SD_StopSound();*/
1201 //      oldborder = bordercolor;
1202 //      VW_ColorBorder (15);
1203
1204         if(beforesort)
1205                 beforesort();
1206
1207         scan = gvar->mm.mmhead;
1208
1209         last = NULL;            // shut up compiler warning
1210
1211         while(scan)
1212         {
1213                 if(scan->attributes & LOCKBIT)
1214                 {
1215                 //
1216                 // block is locked, so try to pile later blocks right after it
1217                 //
1218                         start = scan->start + scan->length;
1219                 }
1220                 else
1221                 {
1222                         if(scan->attributes & PURGEBITS)
1223                         {
1224                         //
1225                         // throw out the purgable block
1226                         //
1227                                 next = scan->next;
1228                                 FREEBLOCK(scan);
1229                                 //MM_FreeBlock(scan, gvar);
1230                                 last->next = next;
1231                                 scan = next;
1232                                 continue;
1233                         }
1234                         else
1235                         {
1236                         //
1237                         // push the non purgable block on top of the last moved block
1238                         //
1239                                 if(scan->start != start)
1240                                 {
1241                                         length = scan->length;
1242                                         source = scan->start;
1243                                         dest = start;
1244                                         while(length > 0xf00)
1245                                         {
1246                                                 movedata(source,0,dest,0,0xf00*16);
1247                                                 length -= 0xf00;
1248                                                 source += 0xf00;
1249                                                 dest += 0xf00;
1250                                         }
1251                                         movedata(source,0,dest,0,length*16);
1252
1253                                         scan->start = start;
1254                                         *(unsigned *)scan->useptr = start;
1255                                 }
1256                                 start = scan->start + scan->length;
1257                         }
1258                 }
1259
1260                 last = scan;
1261                 scan = scan->next;              // go to next block
1262         }
1263
1264         gvar->mm.mmrover = gvar->mm.mmhead;
1265
1266         if(aftersort)
1267                 aftersort();
1268
1269 //      VW_ColorBorder (oldborder);
1270
1271 /*++++  if(playing)
1272                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
1273 }
1274
1275 //==========================================================================
1276
1277 /*
1278 =====================
1279 =
1280 = MM_ShowMemory
1281 =
1282 =====================
1283 */
1284
1285 void MM_ShowMemory(global_game_variables_t *gvar)
1286 {
1287         //huge mmblocktype huge *scan;
1288         mmblocktype far *scan;
1289         word temp;
1290         sdword  end,owner;
1291         //word chx,chy;
1292         word w;
1293         //dword wwww;
1294         byte    scratch[160],scratch0[4096],scratch1[160],str[16];
1295         //byte d = '#';
1296 //****  VW_SetDefaultColors();
1297 //****  VW_SetLineWidth(40);
1298 //++++mh        temp = bufferofs;
1299 //++++mh        bufferofs = 0;
1300 //****  VW_SetScreen (0,0);
1301         scan = gvar->mm.mmhead;
1302         end = -1;
1303
1304         CA_OpenDebug (gvar);
1305         w=0;
1306         while(scan)
1307         {
1308                 strcpy(scratch, AARESET);
1309                 if(scan->attributes & PURGEBITS)
1310                         strcpy(scratch0, AAMAGENTA);            // dark purple = purgable
1311                 else
1312                         strcpy(scratch0, AABLUE);               // medium blue = non purgable
1313                 if(scan->attributes & LOCKBIT)
1314                         strcpy(scratch0, AARED);                // red = locked
1315                 if(scan->start<=end)
1316                 {
1317                         printf("\nend==%d\n\n", end);
1318                         strcat(scratch, "MM_ShowMemory: Memory block order currupted!\n");
1319                         strcat(scratch, "End's Size: ");
1320                         ultoa (end,str,10);
1321                         strcat (scratch,str);
1322                         strcat(scratch, "\nscan->start's Size: ");
1323                         ultoa (scan->start,str,10);
1324                         strcat (scratch,str);
1325                         write(gvar->handle.debughandle,scratch,strlen(scratch));
1326                         //modexprint(&page, chx, chy, 1, 0, 24, "\nMM_ShowMemory: Memory block order currupted!\n");
1327                         break;
1328                 }
1329                 end = scan->start+(scan->length)-1;
1330 //++++          chy = scan->start/320;
1331 //++++          chx = scan->start%320;
1332                                 //modexhlin(page, scan->start, (unsigned)end, chy, color);
1333                                 //for(chx=scan->start;chx+4>=(word)end;chx+=4)
1334                                 //{
1335 //++++                                  modexClearRegion(page, chx, chy, 4, 4, color);
1336                                 //}
1337 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1338                 for(w=(scan->start)/80;w<=end/80;w++)
1339                 {
1340                         //printf("+     %u      %lu\n", w, scan->length);
1341                         strcat(scratch0, "+");
1342                 }
1343                 //++==++==optional strcat(scratch0, AARESET); strcat(scratch0, AAGREY); strcat(scratch0,"_");
1344 //++++          VW_Plot(scan->start,0,15);
1345 //++++                          modexClearRegion(page, chx, chy, 4, 4, 15);
1346 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1347
1348                 //wwww=(dword)(scan->next->start)-(dword)scan->start;
1349                 //wwww=(dword)scan->start+(dword)(scan->next->start);
1350                 if (scan->next && scan->next->start >= end+1)
1351                 {
1352                         strcat(scratch0, AARESET);
1353                         //++==++==optional strcat(scratch0, "\n");
1354                         strcat(scratch0,AAGREEN);
1355                         for(w=(end+1)/80;w<=((scan->next->start-scan->start)/80);w++)
1356                         //for(w=(wwww)/80;w<=((end+1)/80);w++)
1357                         //for(w=(end+1)/80;w<=((wwww)/80);w++)
1358                         {
1359                                 //printf("0     %x      %u      %lu\n", scan->next->start, w, scan->length);
1360                                 strcat(scratch0,"0");
1361                         }
1362                         //printf("==================\n");
1363                         //printf("w=%u  wwww=%lu        start=%04x      next=%04x       end=%lu\n", w/80, wwww/80, scan->start, (scan->next->start), end+1);
1364                         //printf("==================\n");
1365                         strcat(scratch0, "\n");
1366                         //getch();
1367                 }/*else {//if(scan->next->start <= scan->start){
1368                         scan->next->start=scan->start+0x1000;
1369                         wwww=(dword)(scan->next->start)-(dword)scan->start;
1370                         strcat(scratch0, AARESET);
1371                         strcat(scratch0, "\n");
1372                         strcat(scratch0,AAGREEN);
1373                         for(w=(end+1);w<=(0x1000/80);w++)
1374                         {
1375                                 //printf("0     %x      %x      %u\n", scan->start, w);
1376                                 strcat(scratch0,"0");
1377                         }
1378                         printf("================\n");
1379                         printf("w=%x    start=%x        next=%x end=%u  %lu\n", w, scan->start, (scan->next->start), end+1, wwww);
1380                         printf("================\n");
1381                         getch();
1382                 }*/
1383                 strcat(scratch0, AARESET);
1384                 //strcat(scratch0,"\n");
1385                         //for(chx=scan->next->start;chx+4>=(word)end+1;chx+=4)
1386                         //{
1387 //                              chx+=scan->next->start;
1388 //                              modexClearRegion(page, chx, chy, 4, 4, 2);
1389                         //}
1390                                         //modexhlin(page, end+1,scan->next->start, chy, 0);
1391 /*              y = scan->start/320;
1392                 x = scan->start%320;
1393                 VW_Hlin(x,x+end,y,color);
1394                 VW_Plot(x,y,15);*/
1395 //++++                  VW_Hlin(x+end+1,x+(scan->next->start-scan->start),y,0); // black = free
1396                 strcat(scratch,"Seg:");
1397                 ultoa (scan->start,str,16);
1398                 strcat (scratch,str);
1399                 strcat (scratch,"\tSize:");
1400                 ultoa ((unsigned)scan->length,str,10);
1401                 strcat (scratch,str);
1402                 strcat (scratch,"\tOwner:0x");
1403                 owner = (unsigned)scan->useptr;
1404                 ultoa (owner,str,16);
1405                 strcat (scratch,str);
1406                 strcat (scratch,"\n");
1407                 write(gvar->handle.debughandle,scratch,strlen(scratch));
1408                 write(gvar->handle.debughandle,scratch0,strlen(scratch0));
1409 //modexprint(page, chx, chy, 1, 0, 24, &scratch);
1410 //++++chy+=4;
1411 //fprintf(stdout, "%s", scratch);
1412
1413                 scan = scan->next;
1414         }
1415         /*strcpy(scratch1, AARESET);
1416         strcat(scratch1, "========================================\n");
1417         strcat(scratch1, "near=  ");
1418         ultoa (*(gvar->mm.nearheap),str,10);
1419         strcat (scratch1,str);
1420         strcat(scratch1, "      far= ");
1421         ultoa (*(gvar->mm.farheap),str,10);
1422         strcat (scratch1,str);
1423         strcat(scratch1, "\n");
1424         //strcat(scratch1, "&near=      %Fp ", &(gvar->mm.nearheap));
1425         //strcat(scratch1, "&far=       %Fp", &(gvar->mm.farheap));
1426         //strcat(scratch1, "\n");
1427         strcat(scratch1, "========================================\n");
1428         write(gvar->handle.debughandle,scratch1,strlen(scratch1));*/
1429
1430
1431         CA_CloseDebug (gvar);
1432
1433 //++++mh        IN_Ack();
1434 //****  VW_SetLineWidth(64);
1435 //++++mh        bufferofs = temp;
1436 }
1437
1438 //==========================================================================
1439
1440 /*
1441 =====================
1442 =
1443 = MM_DumpData
1444 =
1445 =====================
1446 */
1447
1448 void MM_DumpData(global_game_variables_t *gvar)
1449 {
1450         //huge mmblocktype huge *scan,huge *best;
1451         mmblocktype far *scan,far *best;
1452         long    lowest,oldlowest;
1453         word    owner;
1454         byte    lock,purge;
1455         FILE    *dumpfile;
1456
1457         free(gvar->mm.nearheap);
1458 #ifdef __BORLANDC__
1459                 dumpfile = fopen ("mmdump.16b","w");
1460 #endif
1461 #ifdef __WATCOMC__
1462                 dumpfile = fopen ("mmdump.16w","w");
1463 #endif
1464         if (!dumpfile){
1465                 printf("MM_DumpData: Couldn't open MMDUMP.16!\n");
1466                 return;
1467         }
1468
1469         lowest = -1;
1470         do
1471         {
1472                 oldlowest = lowest;
1473                 lowest = 0xffff;
1474
1475                 scan = gvar->mm.mmhead;
1476                 while (scan)
1477                 {
1478                         owner = (unsigned)scan->useptr;
1479
1480                         if (owner && owner<lowest && owner > oldlowest)
1481                         {
1482                                 best = scan;
1483                                 lowest = owner;
1484                         }
1485
1486                         scan = scan->next;
1487                 }
1488
1489                 if (lowest != 0xffff)
1490                 {
1491                         if (best->attributes & PURGEBITS)
1492                                 purge = 'P';
1493                         else
1494                                 purge = '-';
1495                         if (best->attributes & LOCKBIT)
1496                                 lock = 'L';
1497                         else
1498                                 lock = '-';
1499                         fprintf (dumpfile,"0x%p (%c%c) = %u\n"
1500                         ,(unsigned)lowest,lock,purge,best->length);
1501                 }
1502
1503         } while (lowest != 0xffff);
1504
1505         fclose(dumpfile);
1506         printf("MMDUMP.16 created.\n");
1507 }
1508
1509 //==========================================================================
1510
1511
1512 /*
1513 ======================
1514 =
1515 = MM_UnusedMemory
1516 =
1517 = Returns the total free space without purging
1518 =
1519 ======================
1520 */
1521
1522 dword MM_UnusedMemory(global_game_variables_t *gvar)
1523 {
1524         dword free;
1525         //huge mmblocktype huge *scan;
1526         mmblocktype far *scan;
1527
1528         free = 0;
1529         scan = gvar->mm.mmhead;
1530
1531         while(scan->next)
1532         {
1533                 free += scan->next->start - (scan->start + scan->length);
1534                 scan = scan->next;
1535         }
1536
1537         return free*16lu;
1538 //      return free;
1539 }
1540
1541 //==========================================================================
1542
1543
1544 /*
1545 ======================
1546 =
1547 = MM_TotalFree
1548 =
1549 = Returns the total free space with purging
1550 =
1551 ======================
1552 */
1553
1554 dword MM_TotalFree(global_game_variables_t *gvar)
1555 {
1556         dword free;
1557         //huge mmblocktype huge *scan;
1558         mmblocktype far *scan;
1559
1560         free = 0;
1561         scan = gvar->mm.mmhead;
1562
1563         while(scan->next)
1564         {
1565                 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1566                         free += scan->length;
1567                 free += scan->next->start - (scan->start + scan->length);
1568                 scan = scan->next;
1569         }
1570
1571         return free*16lu;
1572 //      return free;
1573 }
1574
1575 //==========================================================================
1576
1577 /*
1578 =====================
1579 =
1580 = MM_Report
1581 =
1582 =====================
1583 */
1584
1585 void MM_Report_(global_game_variables_t *gvar)
1586 {
1587         printf("========================================\n");
1588         printf("                MM_Report_\n");
1589         printf("========================================\n");
1590         if(MML_CheckForEMS())
1591         {
1592                 printf("        %cLIMEMS        %u\n", 0xC9, gvar->pm.emm.EMSPresent);
1593                 printf("        %c%cEMM v%x.%x available\n", 0xC7, 0xC4, gvar->pm.emm.EMSVer>>4,gvar->pm.emm.EMSVer&0x0F);
1594                 printf("        %c%ctotalEMSpages:      %u      ", 0xC7, 0xC4, gvar->pm.emm.totalEMSpages); printf("freeEMSpages:       %u\n", gvar->pm.emm.freeEMSpages);
1595                 printf("        %c%cEMSPageFrame:       %04x\n", 0xC7, 0xC4, gvar->pm.emm.EMSPageFrame);
1596                 printf("        %c%cEMSmem:     %lu\n", 0xD3, 0xC4, gvar->mmi.EMSmem);
1597         }
1598         if(MML_CheckForXMS())
1599         {
1600                 printf("        %cXMS   %u\n", 0xC9, gvar->pm.xmm.XMSPresent);
1601                 printf("        %c%cXMS v%x.%x available\n", 0xC7, 0xC4, XMSVer>>8,XMSVer&0x0F);
1602                 printf("        %c%cXMSDriver:  %Fp\n", 0xC7, 0xC4, XMSDriver);
1603                 printf("        %c%cXMSHandle:  %04x\n", 0xC7, 0xC4, gvar->pm.xmm.XMSHandle);
1604                 printf("        %c%cXMSmem:     %lu\n", 0xD3, 0xC4, gvar->mmi.XMSmem);
1605         }
1606         printf("        %cConv. %u\n", 0xC9, gvar->pm.mm.MainPresent); DebugMemory_(gvar, 0);
1607         //printf("mainmem:      %lu\n", gvar->mmi.mainmem);
1608         //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);
1609         //printf("                      UnusedMemory:   %lu\n", MM_UnusedMemory(gvar));
1610         printf("nearheap:       %lu             ", gvar->mmi.nearheap); printf("farheap:        %lu\n", gvar->mmi.farheap);
1611 }
1612
1613 //==========================================================================
1614
1615 /*
1616 =====================
1617 =
1618 = MM_EMSerr
1619 =
1620 =====================
1621 */
1622
1623 void MM_EMSerr(byte *stri, byte err)
1624 {
1625         //Returns a text string describing the error code in EMS.Error.
1626         switch(err)
1627         {
1628                 case 0x0:
1629                         strcat(stri, "successful");
1630                 break;
1631                 case 0x80:
1632                         strcat(stri, "internal error");
1633                 break;
1634                 case 0x81:
1635                         strcat(stri, "hardware malfunction");
1636                 break;
1637                 case 0x82:
1638                         strcat(stri, "busy .. retry later");
1639                 break;
1640                 case 0x83:
1641                         strcat(stri, "invalid handle");
1642                 break;
1643                 case 0x84:
1644                         strcat(stri, "undefined function requested by application");
1645                 break;
1646                 case 0x85:
1647                         strcat(stri, "no more handles available");
1648                 break;
1649                 case 0x86:
1650                         strcat(stri, "error in save or restore of mapping context");
1651                 break;
1652                 case 0x87:
1653                         strcat(stri, "insufficient memory pages in system");
1654                 break;
1655                 case 0x88:
1656                         strcat(stri, "insufficient memory pages available");
1657                 break;
1658                 case 0x89:
1659                         strcat(stri, "zero pages requested");
1660                 break;
1661                 case 0x8A:
1662                         strcat(stri, "invalid logical page number encountered");
1663                 break;
1664                 case 0x8B:
1665                         strcat(stri, "invalid physical page number encountered");
1666                 break;
1667                 case 0x8C:
1668                         strcat(stri, "page-mapping hardware state save area is full");
1669                 break;
1670                 case 0x8D:
1671                         strcat(stri, "save of mapping context failed");
1672                 break;
1673                 case 0x8E:
1674                         strcat(stri, "restore of mapping context failed");
1675                 break;
1676                 case 0x8F:
1677                         strcat(stri, "undefined subfunction");
1678                 break;
1679                 case 0x90:
1680                         strcat(stri, "undefined attribute type");
1681                 break;
1682                 case 0x91:
1683                         strcat(stri, "feature not supported");
1684                 break;
1685                 case 0x92:
1686                         strcat(stri, "successful, but a portion of the source region has been overwritten");
1687                 break;
1688                 case 0x93:
1689                         strcat(stri, "length of source or destination region exceeds length of region allocated to either source or destination handle");
1690                 break;
1691                 case 0x94:
1692                         strcat(stri, "conventional and expanded memory regions overlap");
1693                 break;
1694                 case 0x95:
1695                         strcat(stri, "offset within logical page exceeds size of logical page");
1696                 break;
1697                 case 0x96:
1698                         strcat(stri, "region length exceeds 1 MB");
1699                 break;
1700                 case 0x97:
1701                         strcat(stri, "source and destination EMS regions have same handle and overlap");
1702                 break;
1703                 case 0x98:
1704                         strcat(stri, "memory source or destination type undefined");
1705                 break;
1706                 case 0x9A:
1707                         strcat(stri, "specified alternate map register or DMA register set not supported");
1708                 break;
1709                 case 0x9B:
1710                         strcat(stri, "all alternate map register or DMA register sets currently allocated");
1711                 break;
1712                 case 0x9C:
1713                         strcat(stri, "alternate map register or DMA register sets not supported");
1714                 break;
1715                 case 0x9D:
1716                         strcat(stri, "undefined or unallocated alternate map register or DMA register set");
1717                 break;
1718                 case 0x9E:
1719                         strcat(stri, "dedicated DMA channels not supported");
1720                 break;
1721                 case 0x9F:
1722                         strcat(stri, "specified dedicated DMA channel not supported");
1723                 break;
1724                 case 0xA0:
1725                         strcat(stri, "no such handle name");
1726                 break;
1727                 case 0xA1:
1728                         strcat(stri, "a handle found had no name, or duplicate handle name");
1729                 break;
1730                 case 0xA2:
1731                         strcat(stri, "attempted to wrap around 1M conventional address space");
1732                 break;
1733                 case 0xA3:
1734                         strcat(stri, "source array corrupted");
1735                 break;
1736                 case 0xA4:
1737                         strcat(stri, "operating system denied access");
1738                 break;
1739                 default:
1740                         strcat(stri, "undefined error");
1741         }
1742 }
1743
1744 //==========================================================================
1745
1746 /*
1747 =====================
1748 =
1749 = MM_BombOnError
1750 =
1751 =====================
1752 */
1753
1754 void MM_BombOnError(boolean bomb, global_game_variables_t *gvar)
1755 {
1756         gvar->mm.bombonerror = bomb;
1757 }
1758
1759 /*void MM_GetNewBlock(global_game_variables_t *gvar)
1760 {
1761         if(!gvar->mm.mmfree)
1762                 MML_ClearBlock(gvar);
1763         gvar->mm.mmnew=gvar->mm.mmfree;
1764         gvar->mm.mmfree=gvar->mm.mmfree->next;
1765         if(!(gvar->mm.mmnew=gvar->mm.mmfree))
1766         {
1767                 printf("MM_GETNEWBLOCK: No free blocks!\n");
1768                 return;
1769         }
1770         gvar->mm.mmfree=gvar->mm.mmfree->next;
1771 }
1772
1773 void MM_FreeBlock(mmblocktype *x, global_game_variables_t *gvar)
1774 {
1775         x->useptr=NULL;
1776         x->next=gvar->mm.mmfree;
1777         gvar->mm.mmfree=x;
1778 }*/
1779
1780 void xms_call(byte v, global_game_variables_t *gvar)
1781 {
1782         dword XMSDriver = gvar->pm.xmm.XMSDriver;
1783         __asm {
1784                 mov     ah,[v]
1785                 call [DWORD PTR XMSDriver]
1786         }
1787 }
1788
1789 /*void MM_seguin(void)
1790 {
1791         __asm {
1792                 push    ds
1793                 mov     ax,ds
1794                 inc             ax
1795                 mov     ds,ax
1796         }
1797 }
1798
1799 void MM_segude(void)
1800 {
1801         __asm {
1802                 pop ds
1803         }
1804 }*/
1805
1806 /*
1807 pull data from far and put it into ds var
1808 mov ax,es:si
1809 mov x,ax
1810 */
1811 /*
1812 ss stack segment
1813 sp top of stack
1814 bp bottem of stack
1815 */