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