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(mminfo_t *mm)
 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         mm->totalEMSpages=totalEMSpages;
 249         mm->freeEMSpages=freeEMSpages;
 250         mm->EMSpageframe=EMSpageframe;
 251         mm->EMSpagesmapped=EMSpagesmapped;
 252         mm->EMShandle=EMShandle;
 253         mm->EMSVer=EMSVer;
 254         return 0;
 255 }
 256
 257
 258 /*
 259 ======================
 260 =
 261 = MML_ShutdownEMS
 262 =
 263 =======================
 264 */
 265
 266 void MML_ShutdownEMS(mminfo_t *mm)
 267 {
 268         boolean errorflag=false;
 269         unsigned EMShandle=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) printf("MML_ShutdownEMS: Error freeing EMS!\n");    //++++ add something
 288 }
 289
 290 /*
 291 ====================
 292 =
 293 = MM_MapEMS
 294 =
 295 = Maps the 64k of EMS used by memory manager into the page frame
 296 = for general use.  This only needs to be called if you are keeping
 297 = other things in EMS.
 298 =
 299 ====================
 300 */
 301
 302 byte MM_MapEMS(mminfo_t *mm, mminfotype *mmi)
 303 {
 304         byte    str[160];
 305         unsigned        EMShandle;
 306         byte err;
 307         boolean errorflag=false;
 308         int     i;
 309         EMShandle=mm->EMShandle;
 310
 311         for (i=0;i<4/*MAPPAGES*/;i++)
 312         {
 313                 __asm {
 314                         mov     ah,EMS_MAPPAGE
 315                         mov     bx,[i]                  // logical page
 316                         mov     al,bl                   // physical page
 317                         mov     dx,[EMShandle]  // handle
 318                         int     EMS_INT
 319                         or      ah,ah
 320                         jnz     error
 321                         jmp End
 322 #ifdef __BORLANDC__
 323                 }
 324 #endif
 325                         error:
 326 #ifdef __BORLANDC__
 327                 __asm {
 328 #endif
 329                         mov     err,ah
 330                         mov     errorflag,1
 331 #ifdef __BORLANDC__
 332                 }
 333 #endif
 334                         End:
 335 #ifdef __WATCOMC__
 336                 }
 337 #endif
 338                 if(errorflag==true)
 339                 {
 340                         strcpy(str,"MM_MapEMS: EMS error ");
 341                         MM_EMSerr(str, err);
 342                         printf("%s\n",str);
 343                         return err;
 344                 }
 345         }
 346         mmi->EMSmem = (i)*0x4000lu;
 347         //printf("              mmi->EMSmem=%lu\n", mmi->EMSmem);
 348         return 0;
 349 }
 350
 351 byte MM_MapXEMS(mminfo_t *mm, mminfotype *mmi)
 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=mm->EMShandle;
 381
 382         if(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         mmi->EMSmem = (i)*0x4000lu;
 425         return 0;
 426 }
 427
 428 //==========================================================================
 429
 430 /*
 431 ======================
 432 =
 433 = MML_CheckForXMS
 434 =
 435 = Check for XMM driver
 436 =
 437 =======================
 438 */
 439
 440 boolean MML_CheckForXMS(mminfo_t *mm)
 441 {
 442         boolean errorflag=false;
 443         mm->numUMBs = 0;
 444
 445         __asm {
 446                 mov     ax,0x4300
 447                 int     0x2f                            // query status of installed diver
 448                 cmp     al,0x80
 449                 je      good
 450                 mov     errorflag,1
 451 #ifdef __BORLANDC__
 452         }
 453 #endif
 454                 good:
 455 #ifdef __WATCOMC__
 456         }
 457 #endif
 458         if(errorflag==true) return false;
 459         else return true;
 460 }
 461
 462
 463 /*
 464 ======================
 465 =
 466 = MML_SetupXMS
 467 =
 468 = Try to allocate all upper memory block
 469 =
 470 =======================
 471 */
 472
 473 void MML_SetupXMS(mminfo_t *mm, mminfotype *mmi)
 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, mm);
 518         mmi->XMSmem += size*16;
 519         mm->UMBbase[mm->numUMBs] = base;
 520         mm->numUMBs++;
 521         if(mm->numUMBs < MAXUMBS)
 522                 goto getmemory;
 523 }
 524
 525
 526 /*
 527 ======================
 528 =
 529 = MML_ShutdownXMS
 530 =
 531 ======================
 532 */
 533
 534 void MML_ShutdownXMS(mminfo_t *mm)
 535 {
 536         int     i;
 537         unsigned        base;
 538
 539         for (i=0;i<mm->numUMBs;i++)
 540         {
 541                 base = mm->UMBbase[i];
 542                 __asm {
 543                         mov     ah,XMS_FREEUMB
 544                         mov     dx,[base]
 545                         call    [DWORD PTR XMSaddr]
 546                 }
 547         }
 548 }
 549
 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, mminfo_t *mm)
 565 {
 566         mmblocktype huge *scan,huge *last;
 567         word            segm=1;
 568         word    oldend;
 569         dword           segmlen;
 570         dword           extra;
 571
 572         scan = last = mm->mmhead;
 573         mm->mmrover = 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, mm);
 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                 mm->mmnew->useptr = NULL;
 625
 626                 mm->mmnew->next = scan->next;
 627                 scan->next = mm->mmnew;
 628                 mm->mmnew->start = segstart+seglength;
 629                 mm->mmnew->length = extra;
 630                 mm->mmnew->attributes = LOCKBIT;
 631         }//else if(segm>0) goto segu;
 632
 633 }*/
 634 void MML_UseSpace(word segstart, dword seglength, mminfo_t *mm)
 635 {
 636         mmblocktype far *scan,far *last;
 637         word    oldend;
 638         sdword          extra;
 639         word segm=1;
 640
 641         scan = last = mm->mmhead;
 642         mm->mmrover = 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+((word)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                 mm->mmnew->useptr = NULL;
 695
 696                 mm->mmnew->next = scan->next;
 697                 scan->next = mm->mmnew;
 698                 mm->mmnew->start = segstart+seglength;
 699                 mm->mmnew->length = extra;
 700                 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(mminfo_t *mm)
 718 {
 719         mmblocktype huge *scan,huge *last;
 720
 721         scan = mm->mmhead->next;
 722
 723         while(scan)
 724         {
 725                 if(!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS))
 726                 {
 727                         MM_FreePtr(scan->useptr, mm);
 728                         return;
 729                 }
 730                 scan = scan->next;
 731         }
 732
 733         printf("MM_ClearBlock: No purgable blocks!\n");
 734 }
 735
 736
 737 //==========================================================================
 738
 739 /*
 740 ===================
 741 =
 742 = MM_Startup
 743 =
 744 = Grabs all space from turbo with malloc/farmalloc
 745 = Allocates bufferseg misc buffer
 746 =
 747 ===================
 748 */
 749
 750 void MM_Startup(mminfo_t *mm, mminfotype *mmi)
 751 {
 752         int i;
 753         dword length,seglength;
 754         //dword length; word seglength;
 755         void huge       *start;
 756         word    segstart;//,endfree;
 757
 758 //      if(mm->mmstarted)
 759 //              MM_Shutdown(mm);
 760
 761         mm->mmstarted = true;
 762         mm->bombonerror = true;
 763
 764 //
 765 // set up the linked list (everything in the free list;
 766 //
 767         mm->mmhead = NULL;
 768         mm->mmfree = &(mm->mmblocks[0]);
 769         for(i=0;i<MAXBLOCKS-1;i++)
 770         {
 771                 mm->mmblocks[i].next = &(mm->mmblocks[i+1]);
 772         }
 773         mm->mmblocks[i].next = NULL;
 774
 775 //
 776 // locked block of all memory until we punch out free space
 777 //
 778         GETNEWBLOCK;
 779         mm->mmhead = mm->mmnew;                         // this will allways be the first node
 780         mm->mmnew->start = 0;
 781         mm->mmnew->length = 0xffff;
 782         mm->mmnew->attributes = LOCKBIT;
 783         mm->mmnew->next = NULL;
 784         mm->mmrover = mm->mmhead;
 785
 786 //
 787 // get all available near conventional memory segments
 788 //
 789 #ifdef __WATCOMC__
 790         _nheapgrow();
 791         length=(dword)_memavl();//(dword)GetFreeSize();
 792         start = (void huge *)(mm->nearheap = _nmalloc(length));
 793 #endif
 794 #ifdef __BORLANDC__
 795         length=coreleft();
 796         start = (void huge *)(mm->nearheap = malloc(length));
 797 #endif
 798         length -= 16-(FP_OFF(start)&15);
 799         length -= SAVENEARHEAP;
 800         seglength = length / 16;                        // now in paragraphs
 801         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 802         MML_UseSpace(segstart,seglength, mm);
 803         mmi->nearheap = length;
 804         //printf("start=%Fp     segstart=%x     seglen=%lu      len=%lu\n", start, segstart, seglength, length);
 805
 806 //
 807 // get all available far conventional memory segments
 808 //
 809         //printf("_FARCORELEFT                          %lu\n", _FCORELEFT);
 810 #ifdef __WATCOMC__
 811         _fheapgrow();
 812 #endif
 813 #ifdef __BORLANDC__
 814         printf("farcoreleft()                           %lu\n", farcoreleft());
 815         printf("(farcoreleft()+32)-_FCORELEFT   %d\n", (sword)((farcoreleft()+32)-_FCORELEFT));
 816 #endif
 817         length=_FCORELEFT;//_fcoreleft();//(dword)GetFarFreeSize();//0xffffUL*4UL;
 818         start = mm->farheap = _fmalloc(length);
 819         //start = mm->farheap = halloc(length, 1);
 820         length -= 16-(FP_OFF(start)&15);
 821         length -= SAVEFARHEAP;
 822         seglength = length / 16;                        // now in paragraphs
 823         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 824         MML_UseSpace(segstart,seglength, mm);
 825         mmi->farheap = length;
 826         //printf("start=%Fp     segstart=%x     seglen=%lu      len=%lu\n", start, segstart, seglength, length);
 827
 828         mmi->mainmem = mmi->nearheap + mmi->farheap;
 829
 830 //
 831 // detect EMS and allocate up to 64K at page frame
 832 //
 833         mmi->EMSmem = 0;
 834 //goto emsskip; //0000
 835         for(i = 1;i <
 836 #ifdef __WATCOMC__
 837         __argc
 838 #endif
 839 #ifdef __BORLANDC__
 840         _argc
 841 #endif
 842         ;i++)
 843         {
 844                 if(US_CheckParm(
 845 #ifdef __WATCOMC__
 846         __argv[i]
 847 #endif
 848 #ifdef __BORLANDC__
 849         _argv[i]
 850 #endif
 851                         ,ParmStringsexmm) == 0)
 852                         goto emsskip;                           // param NOEMS
 853         }
 854         if(MML_CheckForEMS())
 855         {
 856                 MML_SetupEMS(mm);                                       // allocate space
 857                 //TODO: EMS4! AND EMS 3.2 MASSIVE DATA HANDLMENT!
 858                 MML_UseSpace(mm->EMSpageframe,(MAPPAGES)*0x4000lu, mm);
 859                 //if(mm->EMSVer<0x40)
 860                         MM_MapEMS(mm, mmi);                                     // map in used pages
 861                 //else
 862                         //MM_MapXEMS(mm, mmi);                                  // map in used pages
 863         }
 864
 865 //
 866 // detect XMS and get upper memory blocks
 867 //
 868 emsskip:
 869         mmi->XMSmem = 0;
 870 goto xmsskip;//0000
 871         for(i = 1;i <
 872 #ifdef __WATCOMC__
 873         __argc
 874 #endif
 875 #ifdef __BORLANDC__
 876         _argc
 877 #endif
 878         ;i++)
 879         {
 880                 if(US_CheckParm(
 881 #ifdef __WATCOMC__
 882         __argv[i]
 883 #endif
 884 #ifdef __BORLANDC__
 885         _argv[i]
 886 #endif
 887                         ,ParmStringsexmm) == 0)
 888                         goto xmsskip;                           // param NOXMS
 889         }
 890         if(MML_CheckForXMS(mm))
 891         {
 892                 MML_SetupXMS(mm, mmi);                                  // allocate as many UMBs as possible
 893         }
 894
 895 //
 896 // allocate the misc buffer
 897 //
 898 xmsskip:
 899         mm->mmrover = mm->mmhead;               // start looking for space after low block
 900
 901         MM_GetPtr(&(mm->bufferseg),BUFFERSIZE, mm, mmi);
 902 }
 903
 904 //==========================================================================
 905
 906 /*
 907 ====================
 908 =
 909 = MM_Shutdown
 910 =
 911 = Frees all conventional, EMS, and XMS allocated
 912 =
 913 ====================
 914 */
 915
 916 void MM_Shutdown(mminfo_t *mm)
 917 {
 918         if(!(mm->mmstarted))
 919                 return;
 920
 921         _ffree(mm->farheap);//  printf("                far freed\n");
 922 #ifdef __WATCOMC__
 923         _nfree(mm->nearheap);// printf("                near freed\n");
 924 #endif
 925 #ifdef __BORLANDC__
 926         free(mm->nearheap);//   printf("                near freed\n");
 927 #endif
 928         if(MML_CheckForEMS()){ MML_ShutdownEMS(mm); }//printf("         EMS freed\n"); }
 929         if(MML_CheckForXMS(mm)){ MML_ShutdownXMS(mm); }//printf("               XMS freed\n"); }
 930 }
 931
 932 //==========================================================================
 933
 934 /*
 935 ====================
 936 =
 937 = MM_GetPtr
 938 =
 939 = Allocates an unlocked, unpurgable block
 940 =
 941 ====================
 942 */
 943
 944 void MM_GetPtr (memptr *baseptr, dword size, mminfo_t *mm, mminfotype *mmi)
 945 {
 946         mmblocktype huge *scan,huge *lastscan,huge *endscan
 947                                 ,huge *purge,huge *next;
 948         int                     search;
 949         unsigned        needed,startseg;
 950
 951         needed = (size+15)/16;          // convert size from bytes to paragraphs
 952
 953         GETNEWBLOCK;                            // fill in start and next after a spot is found
 954         mm->mmnew->length = needed;
 955         mm->mmnew->useptr = baseptr;
 956         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 && mm->mmrover == mm->mmhead)
 966                         search++;
 967
 968                 switch (search)
 969                 {
 970                 case 0:
 971                         lastscan = mm->mmrover;
 972                         scan = mm->mmrover->next;
 973                         endscan = NULL;
 974                         break;
 975                 case 1:
 976                         lastscan = mm->mmhead;
 977                         scan = mm->mmhead->next;
 978                         endscan = mm->mmrover;
 979                         break;
 980                 case 2:
 981                         MM_SortMem (mm);
 982                         lastscan = mm->mmhead;
 983                         scan = 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 = mm->mmnew;
1001                                 mm->mmnew->start = *(unsigned *)baseptr = startseg;
1002                                 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                                 mm->mmrover = 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 (mm->bombonerror)
1029         {
1030 #ifdef __WATCOMC__
1031                 //heapdump();
1032 #endif
1033                 printf(OUT_OF_MEM_MSG,(size-mmi->nearheap));
1034                 printf("for stability reasons the program will shut down! wwww\n");
1035                 MM_Shutdown(mm);
1036                 exit(-1);
1037         }
1038         else
1039                 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, mminfo_t *mm)
1055 {
1056         mmblocktype huge *scan,huge *last;
1057
1058         last = mm->mmhead;
1059         scan = last->next;
1060
1061         if(baseptr == mm->mmrover->useptr)      // removed the last allocated block
1062                 mm->mmrover = mm->mmhead;
1063
1064         while(scan->useptr != baseptr && scan)
1065         {
1066                 last = scan;
1067                 scan = scan->next;
1068         }
1069
1070         if(!scan)
1071         {
1072                 printf("MM_FreePtr: Block not found!\n");
1073                 return;
1074         }
1075
1076         last->next = scan->next;
1077
1078         FREEBLOCK(scan);
1079 }
1080 //==========================================================================
1081
1082 /*
1083 =====================
1084 =
1085 = MM_SetPurge
1086 =
1087 = Sets the purge level for a block (locked blocks cannot be made purgable)
1088 =
1089 =====================
1090 */
1091
1092 void MM_SetPurge(memptr *baseptr, int purge, mminfo_t *mm)
1093 {
1094         mmblocktype huge *start;
1095
1096         start = mm->mmrover;
1097
1098         do
1099         {
1100                 if(mm->mmrover->useptr == baseptr)
1101                         break;
1102
1103                 mm->mmrover = mm->mmrover->next;
1104
1105                 if(!mm->mmrover)
1106                         mm->mmrover = mm->mmhead;
1107                 else if(mm->mmrover == start)
1108                 {
1109                         printf("MM_SetPurge: Block not found!");
1110                         return;
1111                 }
1112
1113         } while(1);
1114
1115         mm->mmrover->attributes &= ~PURGEBITS;
1116         mm->mmrover->attributes |= purge;
1117 }
1118
1119 //==========================================================================
1120
1121 /*
1122 =====================
1123 =
1124 = MM_SetLock
1125 =
1126 = Locks / unlocks the block
1127 =
1128 =====================
1129 */
1130
1131 void MM_SetLock(memptr *baseptr, boolean locked, mminfo_t *mm)
1132 {
1133         mmblocktype huge *start;
1134
1135         start = mm->mmrover;
1136
1137         do
1138         {
1139                 if(mm->mmrover->useptr == baseptr)
1140                         break;
1141
1142                 mm->mmrover = mm->mmrover->next;
1143
1144                 if(!mm->mmrover)
1145                         mm->mmrover = mm->mmhead;
1146                 else if(mm->mmrover == start)
1147                 {
1148                         printf("MM_SetLock: Block not found!");
1149                         return;
1150                 }
1151
1152         } while(1);
1153
1154         mm->mmrover->attributes &= ~LOCKBIT;
1155         mm->mmrover->attributes |= locked*LOCKBIT;
1156 }
1157
1158 //==========================================================================
1159
1160 /*
1161 =====================
1162 =
1163 = MM_SortMem
1164 =
1165 = Throws out all purgable stuff and compresses movable blocks
1166 =
1167 =====================
1168 */
1169
1170 void MM_SortMem(mminfo_t *mm)
1171 {
1172         mmblocktype huge *scan,huge *last,huge *next;
1173         unsigned        start,length,source,dest,oldborder;
1174         int                     playing;
1175
1176         //
1177         // lock down a currently playing sound
1178         //
1179 /*++++  playing = SD_SoundPlaying ();
1180         if(playing)
1181         {
1182                 switch (SoundMode)
1183                 {
1184                 case sdm_PC:
1185                         playing += STARTPCSOUNDS;
1186                         break;
1187                 case sdm_AdLib:
1188                         playing += STARTADLIBSOUNDS;
1189                         break;
1190                 }
1191                 MM_SetLock(&(memptr)audiosegs[playing],true);
1192         }
1193
1194
1195         SD_StopSound();*/
1196 //      oldborder = bordercolor;
1197 //      VW_ColorBorder (15);
1198
1199         if(beforesort)
1200                 beforesort();
1201
1202         scan = mm->mmhead;
1203
1204         last = NULL;            // shut up compiler warning
1205
1206         while(scan)
1207         {
1208                 if(scan->attributes & LOCKBIT)
1209                 {
1210                 //
1211                 // block is locked, so try to pile later blocks right after it
1212                 //
1213                         start = scan->start + scan->length;
1214                 }
1215                 else
1216                 {
1217                         if(scan->attributes & PURGEBITS)
1218                         {
1219                         //
1220                         // throw out the purgable block
1221                         //
1222                                 next = scan->next;
1223                                 FREEBLOCK(scan);
1224                                 //MM_FreeBlock(scan, mm);
1225                                 last->next = next;
1226                                 scan = next;
1227                                 continue;
1228                         }
1229                         else
1230                         {
1231                         //
1232                         // push the non purgable block on top of the last moved block
1233                         //
1234                                 if(scan->start != start)
1235                                 {
1236                                         length = scan->length;
1237                                         source = scan->start;
1238                                         dest = start;
1239                                         while(length > 0xf00)
1240                                         {
1241                                                 movedata(source,0,dest,0,0xf00*16);
1242                                                 length -= 0xf00;
1243                                                 source += 0xf00;
1244                                                 dest += 0xf00;
1245                                         }
1246                                         movedata(source,0,dest,0,length*16);
1247
1248                                         scan->start = start;
1249                                         *(unsigned *)scan->useptr = start;
1250                                 }
1251                                 start = scan->start + scan->length;
1252                         }
1253                 }
1254
1255                 last = scan;
1256                 scan = scan->next;              // go to next block
1257         }
1258
1259         mm->mmrover = mm->mmhead;
1260
1261         if(aftersort)
1262                 aftersort();
1263
1264 //      VW_ColorBorder (oldborder);
1265
1266 /*++++  if(playing)
1267                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
1268 }
1269
1270 //==========================================================================
1271
1272 /*
1273 =====================
1274 =
1275 = MM_ShowMemory
1276 =
1277 =====================
1278 */
1279
1280 void MM_ShowMemory(global_game_variables_t *gvar,/*page_t *page, */mminfo_t *mm)
1281 {
1282         mmblocktype huge *scan;
1283         word temp;
1284         sdword  end,owner;
1285         //word chx,chy;
1286         word w;
1287         dword wwww;
1288         byte    scratch[160],scratch0[4096],str[16];
1289         //byte d = '#';
1290 //****  VW_SetDefaultColors();
1291 //****  VW_SetLineWidth(40);
1292 //++++mh        temp = bufferofs;
1293 //++++mh        bufferofs = 0;
1294 //****  VW_SetScreen (0,0);
1295         scan = mm->mmhead;
1296         end = -1;
1297
1298         CA_OpenDebug (gvar);
1299         w=0;
1300         while(scan)
1301         {
1302                 strcpy(scratch, AARESET);
1303                 if(scan->attributes & PURGEBITS)
1304                         strcpy(scratch0, AAMAGENTA);            // dark purple = purgable
1305                 else
1306                         strcpy(scratch0, AABLUE);               // medium blue = non purgable
1307                 if(scan->attributes & LOCKBIT)
1308                         strcpy(scratch0, AARED);                // red = locked
1309                 if(scan->start<=end)
1310                 {
1311                         printf("\nend==%d\n\n", end);
1312                         strcat(scratch, "MM_ShowMemory: Memory block order currupted!\n");
1313                         strcat(scratch, "End's Size: ");
1314                         ultoa (end,str,10);
1315                         strcat (scratch,str);
1316                         strcat(scratch, "\nscan->start's Size: ");
1317                         ultoa (scan->start,str,10);
1318                         strcat (scratch,str);
1319                         write(gvar->handle.debughandle,scratch,strlen(scratch));
1320                         //modexprint(&page, chx, chy, 1, 0, 24, "\nMM_ShowMemory: Memory block order currupted!\n");
1321                         break;
1322                 }
1323                 end = scan->start+(scan->length)-1;
1324 //++++          chy = scan->start/320;
1325 //++++          chx = scan->start%320;
1326                                 //modexhlin(page, scan->start, (unsigned)end, chy, color);
1327                                 //for(chx=scan->start;chx+4>=(word)end;chx+=4)
1328                                 //{
1329 //++++                                  modexClearRegion(page, chx, chy, 4, 4, color);
1330                                 //}
1331 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1332                 for(w=(scan->start)/80;w<=end/80;w++)
1333                 {
1334                         //printf("+     %u      %lu\n", w, scan->length);
1335                         strcat(scratch0, "+");
1336                 }
1337                 strcat(scratch0, AARESET); strcat(scratch0, AAGREY); strcat(scratch0,"_");
1338 //++++          VW_Plot(scan->start,0,15);
1339 //++++                          modexClearRegion(page, chx, chy, 4, 4, 15);
1340 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1341
1342                 wwww=(dword)(scan->next->start)-(dword)scan->start;
1343                 //wwww=(dword)scan->start+(dword)(scan->next->start);
1344                 if (scan->next && scan->next->start >= end+1)
1345                 {
1346                         strcat(scratch0, AARESET);
1347                         strcat(scratch0, "\n");
1348                         strcat(scratch0,AAGREEN);
1349                         for(w=(wwww)/80;w<=((end+1)/80);w++)
1350                         //for(w=(end+1)/80;w<=((wwww)/80);w++)
1351                         {
1352                                 //printf("0     %x      %u      %lu\n", scan->next->start, w, scan->length);
1353                                 strcat(scratch0,"0");
1354                         }
1355                         printf("==================\n");
1356                         printf("w=%u    wwww=%lu        start=%04x      next=%04x       end=%lu\n", w/80, wwww/80, scan->start, (scan->next->start), end+1);
1357                         printf("==================\n");
1358                         strcat(scratch0, "\n");
1359                         //getch();
1360                 }/*else {//if(scan->next->start <= scan->start){
1361                         scan->next->start=scan->start+0x1000;
1362                         wwww=(dword)(scan->next->start)-(dword)scan->start;
1363                         strcat(scratch0, AARESET);
1364                         strcat(scratch0, "\n");
1365                         strcat(scratch0,AAGREEN);
1366                         for(w=(end+1);w<=(0x1000/80);w++)
1367                         {
1368                                 //printf("0     %x      %x      %u\n", scan->start, w);
1369                                 strcat(scratch0,"0");
1370                         }
1371                         printf("================\n");
1372                         printf("w=%x    start=%x        next=%x end=%u  %lu\n", w, scan->start, (scan->next->start), end+1, wwww);
1373                         printf("================\n");
1374                         getch();
1375                 }*/
1376                 strcat(scratch0, AARESET);
1377                 //strcat(scratch0,"\n");
1378                         //for(chx=scan->next->start;chx+4>=(word)end+1;chx+=4)
1379                         //{
1380 //                              chx+=scan->next->start;
1381 //                              modexClearRegion(page, chx, chy, 4, 4, 2);
1382                         //}
1383                                         //modexhlin(page, end+1,scan->next->start, chy, 0);
1384 /*              y = scan->start/320;
1385                 x = scan->start%320;
1386                 VW_Hlin(x,x+end,y,color);
1387                 VW_Plot(x,y,15);*/
1388 //++++                  VW_Hlin(x+end+1,x+(scan->next->start-scan->start),y,0); // black = free
1389                 strcat(scratch,"Seg:");
1390                 ultoa (scan->start,str,16);
1391                 strcat (scratch,str);
1392                 strcat (scratch,"\tSize:");
1393                 ultoa ((word)scan->length,str,10);
1394                 strcat (scratch,str);
1395                 strcat (scratch,"\tOwner:0x");
1396                 owner = (unsigned)scan->useptr;
1397                 ultoa (owner,str,16);
1398                 strcat (scratch,str);
1399                 strcat (scratch,"\n");
1400                 write(gvar->handle.debughandle,scratch,strlen(scratch));
1401                 write(gvar->handle.debughandle,scratch0,strlen(scratch0));
1402 //modexprint(page, chx, chy, 1, 0, 24, &scratch);
1403 //++++chy+=4;
1404 //fprintf(stdout, "%s", scratch);
1405
1406                 scan = scan->next;
1407         }
1408
1409         CA_CloseDebug (gvar);
1410
1411 //++++mh        IN_Ack();
1412 //****  VW_SetLineWidth(64);
1413 //++++mh        bufferofs = temp;
1414 }
1415
1416 //==========================================================================
1417
1418 /*
1419 =====================
1420 =
1421 = MM_DumpData
1422 =
1423 =====================
1424 */
1425
1426 void MM_DumpData(mminfo_t *mm)
1427 {
1428         mmblocktype huge *scan,huge *best;
1429         long    lowest,oldlowest;
1430         word    owner;
1431         byte    lock,purge;
1432         FILE    *dumpfile;
1433
1434         free(mm->nearheap);
1435         dumpfile = fopen ("mmdump.16","w");
1436         if (!dumpfile){
1437                 printf("MM_DumpData: Couldn't open MMDUMP.16!\n");
1438                 return;
1439         }
1440
1441         lowest = -1;
1442         do
1443         {
1444                 oldlowest = lowest;
1445                 lowest = 0xffff;
1446
1447                 scan = mm->mmhead;
1448                 while (scan)
1449                 {
1450                         owner = (word)scan->useptr;
1451
1452                         if (owner && owner<lowest && owner > oldlowest)
1453                         {
1454                                 best = scan;
1455                                 lowest = owner;
1456                         }
1457
1458                         scan = scan->next;
1459                 }
1460
1461                 if (lowest != 0xffff)
1462                 {
1463                         if (best->attributes & PURGEBITS)
1464                                 purge = 'P';
1465                         else
1466                                 purge = '-';
1467                         if (best->attributes & LOCKBIT)
1468                                 lock = 'L';
1469                         else
1470                                 lock = '-';
1471                         fprintf (dumpfile,"0x%p (%c%c) = %u\n"
1472                         ,(word)lowest,lock,purge,best->length);
1473                 }
1474
1475         } while (lowest != 0xffff);
1476
1477         fclose(dumpfile);
1478         printf("MMDUMP.16 created.\n");
1479 }
1480
1481 //==========================================================================
1482
1483
1484 /*
1485 ======================
1486 =
1487 = MM_UnusedMemory
1488 =
1489 = Returns the total free space without purging
1490 =
1491 ======================
1492 */
1493
1494 dword MM_UnusedMemory(mminfo_t *mm)
1495 {
1496         dword free;
1497         mmblocktype huge *scan;
1498
1499         free = 0;
1500         scan = mm->mmhead;
1501
1502         while(scan->next)
1503         {
1504                 free += scan->next->start - (scan->start + scan->length);
1505                 scan = scan->next;
1506         }
1507
1508         return free*16lu;
1509 //      return free;
1510 }
1511
1512 //==========================================================================
1513
1514
1515 /*
1516 ======================
1517 =
1518 = MM_TotalFree
1519 =
1520 = Returns the total free space with purging
1521 =
1522 ======================
1523 */
1524
1525 dword MM_TotalFree(mminfo_t *mm)
1526 {
1527         dword free;
1528         mmblocktype huge *scan;
1529
1530         free = 0;
1531         scan = mm->mmhead;
1532
1533         while(scan->next)
1534         {
1535                 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1536                         free += scan->length;
1537                 free += scan->next->start - (scan->start + scan->length);
1538                 scan = scan->next;
1539         }
1540
1541         return free*16lu;
1542 //      return free;
1543 }
1544
1545 //==========================================================================
1546
1547 /*
1548 =====================
1549 =
1550 = MM_Report
1551 =
1552 =====================
1553 */
1554
1555 void MM_Report(/*page_t *page, */mminfo_t *mm, mminfotype *mmi)
1556 {
1557         if(MML_CheckForEMS())
1558         {
1559                 printf("EMM v%x.%x available\n", mm->EMSVer>>4,mm->EMSVer&0x0F);
1560                 printf("totalEMSpages=%u\n", mm->totalEMSpages);
1561                 printf("freeEMSpages=%u\n", mm->freeEMSpages);
1562                 printf("EMSpageframe=%x\n", mm->EMSpageframe);
1563         }
1564         if(MML_CheckForXMS(mm)) printf("XMSaddr=%X\n", *XMSaddr);
1565         printf("near=%lu\n", mmi->nearheap);
1566         printf("far=%lu\n", mmi->farheap);
1567         printf("EMSmem=%lu\n", mmi->EMSmem);
1568         printf("XMSmem=%lu\n", mmi->XMSmem);
1569         printf("mainmem=%lu\n", mmi->mainmem);
1570         printf("UnusedMemory=%lu\n", MM_UnusedMemory(mm));
1571         printf("TotalFree=%lu\n", MM_TotalFree(mm));
1572         printf("TotalUsed=%lu\n", mmi->mainmem+mmi->EMSmem+mmi->XMSmem+mmi->XMSmem);
1573 }
1574
1575 //==========================================================================
1576
1577 /*
1578 =====================
1579 =
1580 = MM_EMSerr
1581 =
1582 =====================
1583 */
1584
1585 void MM_EMSerr(byte *stri, byte err)
1586 {
1587         //Returns a text string describing the error code in EMS.Error.
1588         switch(err)
1589         {
1590                 case 0x0:
1591                         strcat(stri, "successful");
1592                 break;
1593                 case 0x80:
1594                         strcat(stri, "internal error");
1595                 break;
1596                 case 0x81:
1597                         strcat(stri, "hardware malfunction");
1598                 break;
1599                 case 0x82:
1600                         strcat(stri, "busy .. retry later");
1601                 break;
1602                 case 0x83:
1603                         strcat(stri, "invalid handle");
1604                 break;
1605                 case 0x84:
1606                         strcat(stri, "undefined function requested by application");
1607                 break;
1608                 case 0x85:
1609                         strcat(stri, "no more handles available");
1610                 break;
1611                 case 0x86:
1612                         strcat(stri, "error in save or restore of mapping context");
1613                 break;
1614                 case 0x87:
1615                         strcat(stri, "insufficient memory pages in system");
1616                 break;
1617                 case 0x88:
1618                         strcat(stri, "insufficient memory pages available");
1619                 break;
1620                 case 0x89:
1621                         strcat(stri, "zero pages requested");
1622                 break;
1623                 case 0x8A:
1624                         strcat(stri, "invalid logical page number encountered");
1625                 break;
1626                 case 0x8B:
1627                         strcat(stri, "invalid physical page number encountered");
1628                 break;
1629                 case 0x8C:
1630                         strcat(stri, "page-mapping hardware state save area is full");
1631                 break;
1632                 case 0x8D:
1633                         strcat(stri, "save of mapping context failed");
1634                 break;
1635                 case 0x8E:
1636                         strcat(stri, "restore of mapping context failed");
1637                 break;
1638                 case 0x8F:
1639                         strcat(stri, "undefined subfunction");
1640                 break;
1641                 case 0x90:
1642                         strcat(stri, "undefined attribute type");
1643                 break;
1644                 case 0x91:
1645                         strcat(stri, "feature not supported");
1646                 break;
1647                 case 0x92:
1648                         strcat(stri, "successful, but a portion of the source region has been overwritten");
1649                 break;
1650                 case 0x93:
1651                         strcat(stri, "length of source or destination region exceeds length of region allocated to either source or destination handle");
1652                 break;
1653                 case 0x94:
1654                         strcat(stri, "conventional and expanded memory regions overlap");
1655                 break;
1656                 case 0x95:
1657                         strcat(stri, "offset within logical page exceeds size of logical page");
1658                 break;
1659                 case 0x96:
1660                         strcat(stri, "region length exceeds 1 MB");
1661                 break;
1662                 case 0x97:
1663                         strcat(stri, "source and destination EMS regions have same handle and overlap");
1664                 break;
1665                 case 0x98:
1666                         strcat(stri, "memory source or destination type undefined");
1667                 break;
1668                 case 0x9A:
1669                         strcat(stri, "specified alternate map register or DMA register set not supported");
1670                 break;
1671                 case 0x9B:
1672                         strcat(stri, "all alternate map register or DMA register sets currently allocated");
1673                 break;
1674                 case 0x9C:
1675                         strcat(stri, "alternate map register or DMA register sets not supported");
1676                 break;
1677                 case 0x9D:
1678                         strcat(stri, "undefined or unallocated alternate map register or DMA register set");
1679                 break;
1680                 case 0x9E:
1681                         strcat(stri, "dedicated DMA channels not supported");
1682                 break;
1683                 case 0x9F:
1684                         strcat(stri, "specified dedicated DMA channel not supported");
1685                 break;
1686                 case 0xA0:
1687                         strcat(stri, "no such handle name");
1688                 break;
1689                 case 0xA1:
1690                         strcat(stri, "a handle found had no name, or duplicate handle name");
1691                 break;
1692                 case 0xA2:
1693                         strcat(stri, "attempted to wrap around 1M conventional address space");
1694                 break;
1695                 case 0xA3:
1696                         strcat(stri, "source array corrupted");
1697                 break;
1698                 case 0xA4:
1699                         strcat(stri, "operating system denied access");
1700                 break;
1701                 default:
1702                         strcat(stri, "undefined error");
1703         }
1704 }
1705
1706 //==========================================================================
1707
1708 /*
1709 =====================
1710 =
1711 = MM_BombOnError
1712 =
1713 =====================
1714 */
1715
1716 void MM_BombOnError(boolean bomb, mminfo_t *mm)
1717 {
1718         mm->bombonerror = bomb;
1719 }
1720
1721 /*void MM_GetNewBlock(mminfo_t *mm)
1722 {
1723         if(!mm->mmfree)
1724                 MML_ClearBlock(mm);
1725         mm->mmnew=mm->mmfree;
1726         mm->mmfree=mm->mmfree->next;
1727         if(!(mm->mmnew=mm->mmfree))
1728         {
1729                 printf("MM_GETNEWBLOCK: No free blocks!\n");
1730                 return;
1731         }
1732         mm->mmfree=mm->mmfree->next;
1733 }
1734
1735 void MM_FreeBlock(mmblocktype *x, mminfo_t *mm)
1736 {
1737         x->useptr=NULL;
1738         x->next=mm->mmfree;
1739         mm->mmfree=x;
1740 }*/
1741
1742 /*void MM_seguin(void)
1743 {
1744         __asm {
1745                 push    ds
1746                 mov     ax,ds
1747                 inc             ax
1748                 mov     ds,ax
1749         }
1750 }
1751
1752 void MM_segude(void)
1753 {
1754         __asm {
1755                 pop ds
1756         }
1757 }*/
1758
1759 /*
1760 pull data from far and put it into ds var
1761 mov ax,es:si
1762 mov x,ax
1763 */
1764 /*
1765 ss stack segment
1766 sp top of stack
1767 bp bottem of stack
1768 */