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+((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                 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         //memptr *peeonself;
 758
 759 //      if(mm->mmstarted)
 760 //              MM_Shutdown(mm);
 761
 762         mm->mmstarted = true;
 763         mm->bombonerror = true;
 764
 765 //
 766 // set up the linked list (everything in the free list;
 767 //
 768         mm->mmhead = NULL;
 769         mm->mmfree = &(mm->mmblocks[0]);
 770         for(i=0;i<MAXBLOCKS-1;i++)
 771         {
 772                 mm->mmblocks[i].next = &(mm->mmblocks[i+1]);
 773         }
 774         mm->mmblocks[i].next = NULL;
 775
 776 //
 777 // locked block of all memory until we punch out free space
 778 //
 779         GETNEWBLOCK;
 780         mm->mmhead = mm->mmnew;                         // this will allways be the first node
 781         mm->mmnew->start = 0;
 782         mm->mmnew->length = 0xffff;
 783         mm->mmnew->attributes = LOCKBIT;
 784         mm->mmnew->next = NULL;
 785         //mm->mmnew->useptr = peeonself;
 786         mm->mmrover = 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         start = (void huge *)(mm->nearheap = _nmalloc(length));
 797 #endif
 798 #ifdef __BORLANDC__
 799         length=coreleft();
 800         start = (void huge *)(mm->nearheap = malloc(length));
 801 #endif
 802         length -= 16-(FP_OFF(start)&15);
 803         length -= SAVENEARHEAP;
 804         seglength = length / 16;                        // now in paragraphs
 805         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 806         MML_UseSpace(segstart,seglength, mm);
 807         mmi->nearheap = length;
 808         //printf("start=%Fp     segstart=%x     seglen=%lu      len=%lu\n", start, segstart, seglength, length);
 809
 810 //
 811 // get all available far conventional memory segments
 812 //
 813         //printf("_FARCORELEFT                          %lu\n", _FCORELEFT);
 814 #ifdef __WATCOMC__
 815         _fheapgrow();
 816 #endif
 817 #ifdef __BORLANDC__
 818         printf("farcoreleft()                           %lu\n", farcoreleft());
 819         printf("(farcoreleft()+32)-_FCORELEFT   %d\n", (sword)((farcoreleft()+32)-_FCORELEFT));
 820 #endif
 821         length=_FCORELEFT;//_fcoreleft();//(dword)GetFarFreeSize();//0xffffUL*4UL;
 822         start = mm->farheap = _fmalloc(length);
 823         //start = mm->farheap = halloc(length, 1);
 824         length -= 16-(FP_OFF(start)&15);
 825         length -= SAVEFARHEAP;
 826         seglength = length / 16;                        // now in paragraphs
 827         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 828         MML_UseSpace(segstart,seglength, mm);
 829         mmi->farheap = length;
 830         //printf("start=%Fp     segstart=%x     seglen=%lu      len=%lu\n", start, segstart, seglength, length);
 831
 832         mmi->mainmem = mmi->nearheap + mmi->farheap;
 833
 834 //
 835 // detect EMS and allocate up to 64K at page frame
 836 //
 837         mmi->EMSmem = 0;
 838 //goto emsskip; //0000
 839         for(i = 1;i <
 840 #ifdef __WATCOMC__
 841         __argc
 842 #endif
 843 #ifdef __BORLANDC__
 844         _argc
 845 #endif
 846         ;i++)
 847         {
 848                 if(US_CheckParm(
 849 #ifdef __WATCOMC__
 850         __argv[i]
 851 #endif
 852 #ifdef __BORLANDC__
 853         _argv[i]
 854 #endif
 855                         ,ParmStringsexmm) == 0)
 856                         goto emsskip;                           // param NOEMS
 857         }
 858         if(MML_CheckForEMS())
 859         {
 860                 MML_SetupEMS(mm);                                       // allocate space
 861                 //TODO: EMS4! AND EMS 3.2 MASSIVE DATA HANDLMENT!
 862                 MML_UseSpace(mm->EMSpageframe,(MAPPAGES)*0x4000lu, mm);
 863                 //if(mm->EMSVer<0x40)
 864                         MM_MapEMS(mm, mmi);                                     // map in used pages
 865                 //else
 866                         //MM_MapXEMS(mm, mmi);                                  // map in used pages
 867         }
 868
 869 //
 870 // detect XMS and get upper memory blocks
 871 //
 872 emsskip:
 873         mmi->XMSmem = 0;
 874 goto xmsskip;//0000
 875         for(i = 1;i <
 876 #ifdef __WATCOMC__
 877         __argc
 878 #endif
 879 #ifdef __BORLANDC__
 880         _argc
 881 #endif
 882         ;i++)
 883         {
 884                 if(US_CheckParm(
 885 #ifdef __WATCOMC__
 886         __argv[i]
 887 #endif
 888 #ifdef __BORLANDC__
 889         _argv[i]
 890 #endif
 891                         ,ParmStringsexmm) == 0)
 892                         goto xmsskip;                           // param NOXMS
 893         }
 894         if(MML_CheckForXMS(mm))
 895         {
 896                 MML_SetupXMS(mm, mmi);                                  // allocate as many UMBs as possible
 897         }
 898
 899 //
 900 // allocate the misc buffer
 901 //
 902 xmsskip:
 903         mm->mmrover = mm->mmhead;               // start looking for space after low block
 904
 905         MM_GetPtr(&(mm->bufferseg),BUFFERSIZE, mm, mmi);
 906 }
 907
 908 //==========================================================================
 909
 910 /*
 911 ====================
 912 =
 913 = MM_Shutdown
 914 =
 915 = Frees all conventional, EMS, and XMS allocated
 916 =
 917 ====================
 918 */
 919
 920 void MM_Shutdown(mminfo_t *mm)
 921 {
 922         if(!(mm->mmstarted))
 923                 return;
 924
 925         _ffree(mm->farheap);//  printf("                far freed\n");
 926 #ifdef __WATCOMC__
 927         _nfree(mm->nearheap);// printf("                near freed\n");
 928 #endif
 929 #ifdef __BORLANDC__
 930         free(mm->nearheap);//   printf("                near freed\n");
 931 #endif
 932         if(MML_CheckForEMS()){ MML_ShutdownEMS(mm); }//printf("         EMS freed\n"); }
 933         if(MML_CheckForXMS(mm)){ MML_ShutdownXMS(mm); }//printf("               XMS freed\n"); }
 934 }
 935
 936 //==========================================================================
 937
 938 /*
 939 ====================
 940 =
 941 = MM_GetPtr
 942 =
 943 = Allocates an unlocked, unpurgable block
 944 =
 945 ====================
 946 */
 947
 948 void MM_GetPtr (memptr *baseptr, dword size, mminfo_t *mm, mminfotype *mmi)
 949 {
 950         mmblocktype huge *scan,huge *lastscan,huge *endscan
 951                                 ,huge *purge,huge *next;
 952         int                     search;
 953         unsigned        needed,startseg;
 954
 955         needed = (size+15)/16;          // convert size from bytes to paragraphs
 956
 957         GETNEWBLOCK;                            // fill in start and next after a spot is found
 958         mm->mmnew->length = needed;
 959         mm->mmnew->useptr = baseptr;
 960         //if(mm->mmnew->useptr==NULL){
 961         printf("baseptr=%04x    ", baseptr); printf("useptr=%04x\n", mm->mmnew->useptr);
 962         printf("*baseptr=%04x   ", *baseptr); printf("*useptr=%04x\n", *(mm->mmnew->useptr));
 963         //printf("*baseptr=%Fp  ", *baseptr); printf("*useptr=%Fp\n", *(mm->mmnew->useptr));
 964         //exit(-5); }
 965         mm->mmnew->attributes = BASEATTRIBUTES;
 966
 967 //tryagain:
 968         for (search = 0; search<3; search++)
 969         {
 970         //
 971         // first search:        try to allocate right after the rover, then on up
 972         // second search:       search from the head pointer up to the rover
 973         // third search:        compress memory, then scan from start
 974                 if (search == 1 && mm->mmrover == mm->mmhead)
 975                         search++;
 976
 977                 switch (search)
 978                 {
 979                 case 0:
 980                         lastscan = mm->mmrover;
 981                         scan = mm->mmrover->next;
 982                         endscan = NULL;
 983                         break;
 984                 case 1:
 985                         lastscan = mm->mmhead;
 986                         scan = mm->mmhead->next;
 987                         endscan = mm->mmrover;
 988                         break;
 989                 case 2:
 990                         MM_SortMem (mm);
 991                         lastscan = mm->mmhead;
 992                         scan = mm->mmhead->next;
 993                         endscan = NULL;
 994                         break;
 995                 }
 996
 997                 startseg = lastscan->start + lastscan->length;
 998
 999                 while (scan != endscan)
1000                 {
1001                         if (scan->start - startseg >= needed)
1002                         {
1003                         //
1004                         // got enough space between the end of lastscan and
1005                         // the start of scan, so throw out anything in the middle
1006                         // and allocate the new block
1007                         //
1008                                 purge = lastscan->next;
1009                                 lastscan->next = mm->mmnew;
1010                                 mm->mmnew->start = *(unsigned *)baseptr = startseg;
1011                                 mm->mmnew->next = scan;
1012                                 while ( purge != scan)
1013                                 {       // free the purgable block
1014                                         next = purge->next;
1015                                         FREEBLOCK(purge);
1016                                         purge = next;           // purge another if not at scan
1017                                 }
1018                                 mm->mmrover = mm->mmnew;
1019                                 return; // good allocation!
1020                         }
1021
1022                         //
1023                         // if this block is purge level zero or locked, skip past it
1024                         //
1025                         if ( (scan->attributes & LOCKBIT)
1026                                 || !(scan->attributes & PURGEBITS) )
1027                         {
1028                                 lastscan = scan;
1029                                 startseg = lastscan->start + lastscan->length;
1030                         }
1031
1032
1033                         scan=scan->next;                // look at next line
1034                 }
1035         }
1036
1037         if (mm->bombonerror)
1038         {
1039 #ifdef __WATCOMC__
1040                 //heapdump();
1041 #endif
1042                 printf(OUT_OF_MEM_MSG,(size-mmi->nearheap));
1043                 printf("for stability reasons the program will shut down! wwww\n");
1044                 MM_Shutdown(mm);
1045                 exit(-1);
1046         }
1047         else
1048                 mm->mmerror = true;
1049 }
1050
1051 //==========================================================================
1052
1053 /*
1054 ====================
1055 =
1056 = MM_FreePtr
1057 =
1058 = Allocates an unlocked, unpurgable block
1059 =
1060 ====================
1061 */
1062
1063 void MM_FreePtr(memptr *baseptr, mminfo_t *mm)
1064 {
1065         mmblocktype huge *scan,huge *last;
1066
1067         last = mm->mmhead;
1068         scan = last->next;
1069
1070         if(baseptr == mm->mmrover->useptr)      // removed the last allocated block
1071                 mm->mmrover = mm->mmhead;
1072
1073         while(scan->useptr != baseptr && scan)
1074         {
1075                 last = scan;
1076                 scan = scan->next;
1077         }
1078
1079         if(!scan)
1080         {
1081                 printf("MM_FreePtr: Block not found!\n");
1082                 return;
1083         }
1084
1085         last->next = scan->next;
1086
1087         FREEBLOCK(scan);
1088 }
1089 //==========================================================================
1090
1091 /*
1092 =====================
1093 =
1094 = MM_SetPurge
1095 =
1096 = Sets the purge level for a block (locked blocks cannot be made purgable)
1097 =
1098 =====================
1099 */
1100
1101 void MM_SetPurge(memptr *baseptr, int purge, mminfo_t *mm)
1102 {
1103         mmblocktype huge *start;
1104
1105         start = mm->mmrover;
1106
1107         do
1108         {
1109                 if(mm->mmrover->useptr == baseptr)
1110                         break;
1111
1112                 mm->mmrover = mm->mmrover->next;
1113
1114                 if(!mm->mmrover)
1115                         mm->mmrover = mm->mmhead;
1116                 else if(mm->mmrover == start)
1117                 {
1118                         printf("MM_SetPurge: Block not found!");
1119                         return;
1120                 }
1121
1122         } while(1);
1123
1124         mm->mmrover->attributes &= ~PURGEBITS;
1125         mm->mmrover->attributes |= purge;
1126 }
1127
1128 //==========================================================================
1129
1130 /*
1131 =====================
1132 =
1133 = MM_SetLock
1134 =
1135 = Locks / unlocks the block
1136 =
1137 =====================
1138 */
1139
1140 void MM_SetLock(memptr *baseptr, boolean locked, mminfo_t *mm)
1141 {
1142         mmblocktype huge *start;
1143
1144         start = mm->mmrover;
1145
1146         do
1147         {
1148                 if(mm->mmrover->useptr == baseptr)
1149                         break;
1150
1151                 mm->mmrover = mm->mmrover->next;
1152
1153                 if(!mm->mmrover)
1154                         mm->mmrover = mm->mmhead;
1155                 else if(mm->mmrover == start)
1156                 {
1157                         printf("MM_SetLock: Block not found!");
1158                         return;
1159                 }
1160
1161         } while(1);
1162
1163         mm->mmrover->attributes &= ~LOCKBIT;
1164         mm->mmrover->attributes |= locked*LOCKBIT;
1165 }
1166
1167 //==========================================================================
1168
1169 /*
1170 =====================
1171 =
1172 = MM_SortMem
1173 =
1174 = Throws out all purgable stuff and compresses movable blocks
1175 =
1176 =====================
1177 */
1178
1179 void MM_SortMem(mminfo_t *mm)
1180 {
1181         mmblocktype huge *scan,huge *last,huge *next;
1182         unsigned        start,length,source,dest,oldborder;
1183         int                     playing;
1184
1185         //
1186         // lock down a currently playing sound
1187         //
1188 /*++++  playing = SD_SoundPlaying ();
1189         if(playing)
1190         {
1191                 switch (SoundMode)
1192                 {
1193                 case sdm_PC:
1194                         playing += STARTPCSOUNDS;
1195                         break;
1196                 case sdm_AdLib:
1197                         playing += STARTADLIBSOUNDS;
1198                         break;
1199                 }
1200                 MM_SetLock(&(memptr)audiosegs[playing],true);
1201         }
1202
1203
1204         SD_StopSound();*/
1205 //      oldborder = bordercolor;
1206 //      VW_ColorBorder (15);
1207
1208         if(beforesort)
1209                 beforesort();
1210
1211         scan = mm->mmhead;
1212
1213         last = NULL;            // shut up compiler warning
1214
1215         while(scan)
1216         {
1217                 if(scan->attributes & LOCKBIT)
1218                 {
1219                 //
1220                 // block is locked, so try to pile later blocks right after it
1221                 //
1222                         start = scan->start + scan->length;
1223                 }
1224                 else
1225                 {
1226                         if(scan->attributes & PURGEBITS)
1227                         {
1228                         //
1229                         // throw out the purgable block
1230                         //
1231                                 next = scan->next;
1232                                 FREEBLOCK(scan);
1233                                 //MM_FreeBlock(scan, mm);
1234                                 last->next = next;
1235                                 scan = next;
1236                                 continue;
1237                         }
1238                         else
1239                         {
1240                         //
1241                         // push the non purgable block on top of the last moved block
1242                         //
1243                                 if(scan->start != start)
1244                                 {
1245                                         length = scan->length;
1246                                         source = scan->start;
1247                                         dest = start;
1248                                         while(length > 0xf00)
1249                                         {
1250                                                 movedata(source,0,dest,0,0xf00*16);
1251                                                 length -= 0xf00;
1252                                                 source += 0xf00;
1253                                                 dest += 0xf00;
1254                                         }
1255                                         movedata(source,0,dest,0,length*16);
1256
1257                                         scan->start = start;
1258                                         *(unsigned *)scan->useptr = start;
1259                                 }
1260                                 start = scan->start + scan->length;
1261                         }
1262                 }
1263
1264                 last = scan;
1265                 scan = scan->next;              // go to next block
1266         }
1267
1268         mm->mmrover = mm->mmhead;
1269
1270         if(aftersort)
1271                 aftersort();
1272
1273 //      VW_ColorBorder (oldborder);
1274
1275 /*++++  if(playing)
1276                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
1277 }
1278
1279 //==========================================================================
1280
1281 /*
1282 =====================
1283 =
1284 = MM_ShowMemory
1285 =
1286 =====================
1287 */
1288
1289 void MM_ShowMemory(global_game_variables_t *gvar,/*page_t *page, */mminfo_t *mm)
1290 {
1291         mmblocktype huge *scan;
1292         word temp;
1293         sdword  end,owner;
1294         //word chx,chy;
1295         word w;
1296         //dword wwww;
1297         byte    scratch[160],scratch0[4096],scratch1[160],str[16];
1298         //byte d = '#';
1299 //****  VW_SetDefaultColors();
1300 //****  VW_SetLineWidth(40);
1301 //++++mh        temp = bufferofs;
1302 //++++mh        bufferofs = 0;
1303 //****  VW_SetScreen (0,0);
1304         scan = mm->mmhead;
1305         end = -1;
1306
1307         CA_OpenDebug (gvar);
1308         w=0;
1309         while(scan)
1310         {
1311                 strcpy(scratch, AARESET);
1312                 if(scan->attributes & PURGEBITS)
1313                         strcpy(scratch0, AAMAGENTA);            // dark purple = purgable
1314                 else
1315                         strcpy(scratch0, AABLUE);               // medium blue = non purgable
1316                 if(scan->attributes & LOCKBIT)
1317                         strcpy(scratch0, AARED);                // red = locked
1318                 if(scan->start<=end)
1319                 {
1320                         printf("\nend==%d\n\n", end);
1321                         strcat(scratch, "MM_ShowMemory: Memory block order currupted!\n");
1322                         strcat(scratch, "End's Size: ");
1323                         ultoa (end,str,10);
1324                         strcat (scratch,str);
1325                         strcat(scratch, "\nscan->start's Size: ");
1326                         ultoa (scan->start,str,10);
1327                         strcat (scratch,str);
1328                         write(gvar->handle.debughandle,scratch,strlen(scratch));
1329                         //modexprint(&page, chx, chy, 1, 0, 24, "\nMM_ShowMemory: Memory block order currupted!\n");
1330                         break;
1331                 }
1332                 end = scan->start+(scan->length)-1;
1333 //++++          chy = scan->start/320;
1334 //++++          chx = scan->start%320;
1335                                 //modexhlin(page, scan->start, (unsigned)end, chy, color);
1336                                 //for(chx=scan->start;chx+4>=(word)end;chx+=4)
1337                                 //{
1338 //++++                                  modexClearRegion(page, chx, chy, 4, 4, color);
1339                                 //}
1340 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1341                 for(w=(scan->start)/80;w<=end/80;w++)
1342                 {
1343                         //printf("+     %u      %lu\n", w, scan->length);
1344                         strcat(scratch0, "+");
1345                 }
1346                 strcat(scratch0, AARESET); strcat(scratch0, AAGREY); strcat(scratch0,"_");
1347 //++++          VW_Plot(scan->start,0,15);
1348 //++++                          modexClearRegion(page, chx, chy, 4, 4, 15);
1349 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1350
1351                 //wwww=(dword)(scan->next->start)-(dword)scan->start;
1352                 //wwww=(dword)scan->start+(dword)(scan->next->start);
1353                 if (scan->next && scan->next->start >= end+1)
1354                 {
1355                         strcat(scratch0, AARESET);
1356                         strcat(scratch0, "\n");
1357                         strcat(scratch0,AAGREEN);
1358                         for(w=(end+1)/80;w<=((scan->next->start-scan->start)/80);w++)
1359                         //for(w=(wwww)/80;w<=((end+1)/80);w++)
1360                         //for(w=(end+1)/80;w<=((wwww)/80);w++)
1361                         {
1362                                 //printf("0     %x      %u      %lu\n", scan->next->start, w, scan->length);
1363                                 strcat(scratch0,"0");
1364                         }
1365                         //printf("==================\n");
1366                         //printf("w=%u  wwww=%lu        start=%04x      next=%04x       end=%lu\n", w/80, wwww/80, scan->start, (scan->next->start), end+1);
1367                         //printf("==================\n");
1368                         strcat(scratch0, "\n");
1369                         //getch();
1370                 }/*else {//if(scan->next->start <= scan->start){
1371                         scan->next->start=scan->start+0x1000;
1372                         wwww=(dword)(scan->next->start)-(dword)scan->start;
1373                         strcat(scratch0, AARESET);
1374                         strcat(scratch0, "\n");
1375                         strcat(scratch0,AAGREEN);
1376                         for(w=(end+1);w<=(0x1000/80);w++)
1377                         {
1378                                 //printf("0     %x      %x      %u\n", scan->start, w);
1379                                 strcat(scratch0,"0");
1380                         }
1381                         printf("================\n");
1382                         printf("w=%x    start=%x        next=%x end=%u  %lu\n", w, scan->start, (scan->next->start), end+1, wwww);
1383                         printf("================\n");
1384                         getch();
1385                 }*/
1386                 strcat(scratch0, AARESET);
1387                 //strcat(scratch0,"\n");
1388                         //for(chx=scan->next->start;chx+4>=(word)end+1;chx+=4)
1389                         //{
1390 //                              chx+=scan->next->start;
1391 //                              modexClearRegion(page, chx, chy, 4, 4, 2);
1392                         //}
1393                                         //modexhlin(page, end+1,scan->next->start, chy, 0);
1394 /*              y = scan->start/320;
1395                 x = scan->start%320;
1396                 VW_Hlin(x,x+end,y,color);
1397                 VW_Plot(x,y,15);*/
1398 //++++                  VW_Hlin(x+end+1,x+(scan->next->start-scan->start),y,0); // black = free
1399                 strcat(scratch,"Seg:");
1400                 ultoa (scan->start,str,16);
1401                 strcat (scratch,str);
1402                 strcat (scratch,"\tSize:");
1403                 ultoa ((unsigned)scan->length,str,10);
1404                 strcat (scratch,str);
1405                 strcat (scratch,"\tOwner:0x");
1406                 owner = (unsigned)scan->useptr;
1407                 ultoa (owner,str,16);
1408                 strcat (scratch,str);
1409                 strcat (scratch,"\n");
1410                 write(gvar->handle.debughandle,scratch,strlen(scratch));
1411                 write(gvar->handle.debughandle,scratch0,strlen(scratch0));
1412 //modexprint(page, chx, chy, 1, 0, 24, &scratch);
1413 //++++chy+=4;
1414 //fprintf(stdout, "%s", scratch);
1415
1416                 scan = scan->next;
1417         }
1418         /*strcpy(scratch1, AARESET);
1419         strcat(scratch1, "========================================\n");
1420         strcat(scratch1, "near=  ");
1421         ultoa (*(mm->nearheap),str,10);
1422         strcat (scratch1,str);
1423         strcat(scratch1, "      far= ");
1424         ultoa (*(mm->farheap),str,10);
1425         strcat (scratch1,str);
1426         strcat(scratch1, "\n");
1427         //strcat(scratch1, "&near=      %Fp ", &(mm->nearheap));
1428         //strcat(scratch1, "&far=       %Fp", &(mm->farheap));
1429         //strcat(scratch1, "\n");
1430         strcat(scratch1, "========================================\n");
1431         write(gvar->handle.debughandle,scratch1,strlen(scratch1));*/
1432
1433
1434         CA_CloseDebug (gvar);
1435
1436 //++++mh        IN_Ack();
1437 //****  VW_SetLineWidth(64);
1438 //++++mh        bufferofs = temp;
1439 }
1440
1441 //==========================================================================
1442
1443 /*
1444 =====================
1445 =
1446 = MM_DumpData
1447 =
1448 =====================
1449 */
1450
1451 void MM_DumpData(mminfo_t *mm)
1452 {
1453         mmblocktype huge *scan,huge *best;
1454         long    lowest,oldlowest;
1455         word    owner;
1456         byte    lock,purge;
1457         FILE    *dumpfile;
1458
1459         free(mm->nearheap);
1460         dumpfile = fopen ("mmdump.16","w");
1461         if (!dumpfile){
1462                 printf("MM_DumpData: Couldn't open MMDUMP.16!\n");
1463                 return;
1464         }
1465
1466         lowest = -1;
1467         do
1468         {
1469                 oldlowest = lowest;
1470                 lowest = 0xffff;
1471
1472                 scan = mm->mmhead;
1473                 while (scan)
1474                 {
1475                         owner = (unsigned)scan->useptr;
1476
1477                         if (owner && owner<lowest && owner > oldlowest)
1478                         {
1479                                 best = scan;
1480                                 lowest = owner;
1481                         }
1482
1483                         scan = scan->next;
1484                 }
1485
1486                 if (lowest != 0xffff)
1487                 {
1488                         if (best->attributes & PURGEBITS)
1489                                 purge = 'P';
1490                         else
1491                                 purge = '-';
1492                         if (best->attributes & LOCKBIT)
1493                                 lock = 'L';
1494                         else
1495                                 lock = '-';
1496                         fprintf (dumpfile,"0x%p (%c%c) = %u\n"
1497                         ,(unsigned)lowest,lock,purge,best->length);
1498                 }
1499
1500         } while (lowest != 0xffff);
1501
1502         fclose(dumpfile);
1503         printf("MMDUMP.16 created.\n");
1504 }
1505
1506 //==========================================================================
1507
1508
1509 /*
1510 ======================
1511 =
1512 = MM_UnusedMemory
1513 =
1514 = Returns the total free space without purging
1515 =
1516 ======================
1517 */
1518
1519 dword MM_UnusedMemory(mminfo_t *mm)
1520 {
1521         dword free;
1522         mmblocktype huge *scan;
1523
1524         free = 0;
1525         scan = mm->mmhead;
1526
1527         while(scan->next)
1528         {
1529                 free += scan->next->start - (scan->start + scan->length);
1530                 scan = scan->next;
1531         }
1532
1533         return free*16lu;
1534 //      return free;
1535 }
1536
1537 //==========================================================================
1538
1539
1540 /*
1541 ======================
1542 =
1543 = MM_TotalFree
1544 =
1545 = Returns the total free space with purging
1546 =
1547 ======================
1548 */
1549
1550 dword MM_TotalFree(mminfo_t *mm)
1551 {
1552         dword free;
1553         mmblocktype huge *scan;
1554
1555         free = 0;
1556         scan = mm->mmhead;
1557
1558         while(scan->next)
1559         {
1560                 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1561                         free += scan->length;
1562                 free += scan->next->start - (scan->start + scan->length);
1563                 scan = scan->next;
1564         }
1565
1566         return free*16lu;
1567 //      return free;
1568 }
1569
1570 //==========================================================================
1571
1572 /*
1573 =====================
1574 =
1575 = MM_Report
1576 =
1577 =====================
1578 */
1579
1580 void MM_Report(/*page_t *page, */mminfo_t *mm, mminfotype *mmi)
1581 {
1582         if(MML_CheckForEMS())
1583         {
1584                 printf("EMM v%x.%x available\n", mm->EMSVer>>4,mm->EMSVer&0x0F);
1585                 printf("totalEMSpages=%u\n", mm->totalEMSpages);
1586                 printf("freeEMSpages=%u\n", mm->freeEMSpages);
1587                 printf("EMSpageframe=%x\n", mm->EMSpageframe);
1588         }
1589         if(MML_CheckForXMS(mm)) printf("XMSaddr=%X\n", *XMSaddr);
1590         printf("near=%lu\n", mmi->nearheap);
1591         printf("far=%lu\n", mmi->farheap);
1592         printf("EMSmem=%lu\n", mmi->EMSmem);
1593         printf("XMSmem=%lu\n", mmi->XMSmem);
1594         printf("mainmem=%lu\n", mmi->mainmem);
1595         printf("UnusedMemory=%lu\n", MM_UnusedMemory(mm));
1596         printf("TotalFree=%lu\n", MM_TotalFree(mm));
1597         printf("TotalUsed=%lu\n", mmi->mainmem+mmi->EMSmem+mmi->XMSmem+mmi->XMSmem);
1598 }
1599
1600 //==========================================================================
1601
1602 /*
1603 =====================
1604 =
1605 = MM_EMSerr
1606 =
1607 =====================
1608 */
1609
1610 void MM_EMSerr(byte *stri, byte err)
1611 {
1612         //Returns a text string describing the error code in EMS.Error.
1613         switch(err)
1614         {
1615                 case 0x0:
1616                         strcat(stri, "successful");
1617                 break;
1618                 case 0x80:
1619                         strcat(stri, "internal error");
1620                 break;
1621                 case 0x81:
1622                         strcat(stri, "hardware malfunction");
1623                 break;
1624                 case 0x82:
1625                         strcat(stri, "busy .. retry later");
1626                 break;
1627                 case 0x83:
1628                         strcat(stri, "invalid handle");
1629                 break;
1630                 case 0x84:
1631                         strcat(stri, "undefined function requested by application");
1632                 break;
1633                 case 0x85:
1634                         strcat(stri, "no more handles available");
1635                 break;
1636                 case 0x86:
1637                         strcat(stri, "error in save or restore of mapping context");
1638                 break;
1639                 case 0x87:
1640                         strcat(stri, "insufficient memory pages in system");
1641                 break;
1642                 case 0x88:
1643                         strcat(stri, "insufficient memory pages available");
1644                 break;
1645                 case 0x89:
1646                         strcat(stri, "zero pages requested");
1647                 break;
1648                 case 0x8A:
1649                         strcat(stri, "invalid logical page number encountered");
1650                 break;
1651                 case 0x8B:
1652                         strcat(stri, "invalid physical page number encountered");
1653                 break;
1654                 case 0x8C:
1655                         strcat(stri, "page-mapping hardware state save area is full");
1656                 break;
1657                 case 0x8D:
1658                         strcat(stri, "save of mapping context failed");
1659                 break;
1660                 case 0x8E:
1661                         strcat(stri, "restore of mapping context failed");
1662                 break;
1663                 case 0x8F:
1664                         strcat(stri, "undefined subfunction");
1665                 break;
1666                 case 0x90:
1667                         strcat(stri, "undefined attribute type");
1668                 break;
1669                 case 0x91:
1670                         strcat(stri, "feature not supported");
1671                 break;
1672                 case 0x92:
1673                         strcat(stri, "successful, but a portion of the source region has been overwritten");
1674                 break;
1675                 case 0x93:
1676                         strcat(stri, "length of source or destination region exceeds length of region allocated to either source or destination handle");
1677                 break;
1678                 case 0x94:
1679                         strcat(stri, "conventional and expanded memory regions overlap");
1680                 break;
1681                 case 0x95:
1682                         strcat(stri, "offset within logical page exceeds size of logical page");
1683                 break;
1684                 case 0x96:
1685                         strcat(stri, "region length exceeds 1 MB");
1686                 break;
1687                 case 0x97:
1688                         strcat(stri, "source and destination EMS regions have same handle and overlap");
1689                 break;
1690                 case 0x98:
1691                         strcat(stri, "memory source or destination type undefined");
1692                 break;
1693                 case 0x9A:
1694                         strcat(stri, "specified alternate map register or DMA register set not supported");
1695                 break;
1696                 case 0x9B:
1697                         strcat(stri, "all alternate map register or DMA register sets currently allocated");
1698                 break;
1699                 case 0x9C:
1700                         strcat(stri, "alternate map register or DMA register sets not supported");
1701                 break;
1702                 case 0x9D:
1703                         strcat(stri, "undefined or unallocated alternate map register or DMA register set");
1704                 break;
1705                 case 0x9E:
1706                         strcat(stri, "dedicated DMA channels not supported");
1707                 break;
1708                 case 0x9F:
1709                         strcat(stri, "specified dedicated DMA channel not supported");
1710                 break;
1711                 case 0xA0:
1712                         strcat(stri, "no such handle name");
1713                 break;
1714                 case 0xA1:
1715                         strcat(stri, "a handle found had no name, or duplicate handle name");
1716                 break;
1717                 case 0xA2:
1718                         strcat(stri, "attempted to wrap around 1M conventional address space");
1719                 break;
1720                 case 0xA3:
1721                         strcat(stri, "source array corrupted");
1722                 break;
1723                 case 0xA4:
1724                         strcat(stri, "operating system denied access");
1725                 break;
1726                 default:
1727                         strcat(stri, "undefined error");
1728         }
1729 }
1730
1731 //==========================================================================
1732
1733 /*
1734 =====================
1735 =
1736 = MM_BombOnError
1737 =
1738 =====================
1739 */
1740
1741 void MM_BombOnError(boolean bomb, mminfo_t *mm)
1742 {
1743         mm->bombonerror = bomb;
1744 }
1745
1746 /*void MM_GetNewBlock(mminfo_t *mm)
1747 {
1748         if(!mm->mmfree)
1749                 MML_ClearBlock(mm);
1750         mm->mmnew=mm->mmfree;
1751         mm->mmfree=mm->mmfree->next;
1752         if(!(mm->mmnew=mm->mmfree))
1753         {
1754                 printf("MM_GETNEWBLOCK: No free blocks!\n");
1755                 return;
1756         }
1757         mm->mmfree=mm->mmfree->next;
1758 }
1759
1760 void MM_FreeBlock(mmblocktype *x, mminfo_t *mm)
1761 {
1762         x->useptr=NULL;
1763         x->next=mm->mmfree;
1764         mm->mmfree=x;
1765 }*/
1766
1767 /*void MM_seguin(void)
1768 {
1769         __asm {
1770                 push    ds
1771                 mov     ax,ds
1772                 inc             ax
1773                 mov     ds,ax
1774         }
1775 }
1776
1777 void MM_segude(void)
1778 {
1779         __asm {
1780                 pop ds
1781         }
1782 }*/
1783
1784 /*
1785 pull data from far and put it into ds var
1786 mov ax,es:si
1787 mov x,ax
1788 */
1789 /*
1790 ss stack segment
1791 sp top of stack
1792 bp bottem of stack
1793 */