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 (global_game_variables_t *gvar, 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 #include <malloc.h>
  52 #pragma hdrstop
  53
  54 #pragma warn -pro
  55 #pragma warn -use
  56
  57 /*
  58 =============================================================================
  59
  60                                                  GLOBAL VARIABLES
  61
  62 =============================================================================
  63 */
  64
  65 void            (* beforesort) (void);
  66 void            (* aftersort) (void);
  67 void            (* XMSaddr) (void);             // far pointer to XMS driver
  68
  69 /*
  70 =============================================================================
  71
  72                                                  LOCAL VARIABLES
  73
  74 =============================================================================
  75 */
  76 #ifndef __16_PM__
  77 static  char *ParmStringsexmm[] = {"noems","noxms",""};
  78 #endif
  79 /*
  80 ======================
  81 =
  82 = MML_CheckForEMS
  83 =
  84 = Routine from p36 of Extending DOS
  85 =
  86 =======================
  87 */
  88
  89 boolean MML_CheckForEMS(void)
  90 {
  91         boolean emmcfems=0;
  92         static char     emmname[] = "EMMXXXX0"; //fix by andrius4669
  93         __asm {
  94                 mov     dx,OFFSET emmname       //fix by andrius4669
  95                 mov     ax,0x3d00
  96                 int     0x21            // try to open EMMXXXX0 device
  97                 jc      error
  98
  99                 mov     bx,ax
 100                 mov     ax,0x4400
 101
 102                 int     0x21            // get device info
 103                 jc      error
 104
 105                 and     dx,0x80
 106                 jz      error
 107
 108                 mov     ax,0x4407
 109
 110                 int     0x21            // get status
 111                 jc      error
 112                 or      al,al
 113                 jz      error
 114
 115                 mov     ah,0x3e
 116                 int     0x21            // close handle
 117                 jc      error
 118                 //
 119                 // EMS is good
 120                 //
 121                 mov     emmcfems,1
 122                 jmp End
 123 #ifdef __BORLANDC__
 124         }
 125 #endif
 126                 error:
 127 #ifdef __BORLANDC__
 128         __asm {
 129 #endif
 130                 //
 131                 // EMS is bad
 132                 //
 133                 mov     emmcfems,0
 134 #ifdef __BORLANDC__
 135         }
 136 #endif
 137                 End:
 138 #ifdef __WATCOMC__
 139         }
 140 #endif
 141         return(emmcfems);
 142 }
 143
 144 #ifndef __16_PM__
 145 /*
 146 ======================
 147 =
 148 = MML_SetupEMS
 149 =
 150 =======================
 151 */
 152
 153 byte MML_SetupEMS(global_game_variables_t *gvar)
 154 {
 155         byte    str[160];
 156         byte    err;
 157         boolean errorflag=false;
 158
 159         unsigned int EMSVer = 0;
 160         //byte  EMS_status;
 161         unsigned        totalEMSpages,freeEMSpages,EMSPageFrame,EMSpagesmapped,EMSHandle;
 162         totalEMSpages = freeEMSpages = EMSPageFrame = EMSpagesmapped = 0;
 163
 164         __asm {
 165                 mov     ah,EMS_STATUS
 166                 int     EMS_INT                                         // make sure EMS hardware is present
 167                 or      ah,ah
 168                 //mov   [EMS_status],ah
 169                 jnz     error
 170
 171                 mov     ah,EMS_VERSION
 172                 int     EMS_INT
 173                 or      ah,ah
 174                 jnz     error
 175                 mov     [EMSVer],ax                             //      set EMSVer
 176                 cmp     al,0x32                                         // only work on ems 3.2 or greater
 177                 jb      error
 178
 179                 mov     ah,EMS_GETFRAME
 180                 int     EMS_INT                                         // find the page frame address
 181                 or      ah,ah
 182                 jnz     error
 183                 mov     [EMSPageFrame],bx
 184
 185                 mov     ah,EMS_GETPAGES
 186                 int     EMS_INT                                         // find out how much EMS is there
 187                 or      ah,ah
 188                 jnz     error
 189                 mov     [totalEMSpages],dx
 190                 mov     [freeEMSpages],bx
 191                 or      bx,bx
 192                 jz      noEMS                                           // no EMS at all to allocate
 193                                                                                         //EXPAND DONG!!!!
 194                 cmp     [EMSVer],0x40
 195                 jb      low
 196                 cmp     bx,[freeEMSpages]
 197                 jle     getpages
 198                 mov     bx,[freeEMSpages]
 199                 jmp     getpages
 200 #ifdef __BORLANDC__
 201         }
 202 #endif
 203         low:
 204 #ifdef __BORLANDC__
 205         __asm {
 206 #endif
 207                 cmp     bx,4
 208                 jle     getpages                                        // there is only 1,2,3,or 4 pages
 209                 mov     bx,4                                            // we can't use more than 4 pages
 210 #ifdef __BORLANDC__
 211         }
 212 #endif
 213         getpages:
 214 #ifdef __BORLANDC__
 215         __asm {
 216 #endif
 217                 mov     [EMSpagesmapped],bx
 218                 mov     ah,EMS_ALLOCPAGES                       // allocate up to 64k of EMS
 219                 int     EMS_INT
 220                 or      ah,ah
 221                 jnz     error
 222                 mov     [EMSHandle],dx
 223                 jmp End
 224 #ifdef __BORLANDC__
 225         }
 226 #endif
 227         error:
 228 #ifdef __BORLANDC__
 229         __asm {
 230 #endif
 231                 mov     err,ah
 232                 mov     errorflag,1
 233                 jmp End
 234 #ifdef __BORLANDC__
 235         }
 236 #endif
 237 noEMS:
 238 End:
 239 #ifdef __WATCOMC__
 240         }
 241 #endif
 242         if(errorflag==true)
 243         {
 244                 strcpy(str,"MM_SetupEMS: EMS error ");
 245                 MM_EMSerr(str, err);
 246                 printf("%s\n",str);
 247                 return err;
 248         }
 249         gvar->mm.totalEMSpages=totalEMSpages;
 250         gvar->mm.freeEMSpages=freeEMSpages;
 251         gvar->mm.EMSPageFrame=EMSPageFrame;
 252         gvar->mm.EMSpagesmapped=EMSpagesmapped;
 253         gvar->mm.EMSHandle=EMSHandle;
 254         gvar->mm.EMSVer=EMSVer;
 255         return 0;
 256 }
 257
 258
 259 /*
 260 ======================
 261 =
 262 = MML_ShutdownEMS
 263 =
 264 =======================
 265 */
 266
 267 void MML_ShutdownEMS(global_game_variables_t *gvar)
 268 {
 269         boolean errorflag=false;
 270         unsigned EMSHandle=gvar->mm.EMSHandle;
 271
 272         if(!EMSHandle)
 273                 return;
 274         __asm {
 275                 mov     ah,EMS_FREEPAGES
 276                 mov     dx,[EMSHandle]
 277                 int     EMS_INT
 278                 or      ah,ah
 279                 jz      ok
 280                 mov     errorflag,1
 281 #ifdef __BORLANDC__
 282         }
 283 #endif
 284                 ok:
 285 #ifdef __WATCOMC__
 286         }
 287 #endif
 288         if(errorflag==true)
 289                 Quit (gvar, "MML_ShutdownEMS: Error freeing EMS!\n");   //++++ add something
 290 }
 291
 292 /*
 293 ====================
 294 =
 295 = MM_MapEMS
 296 =
 297 = Maps the 64k of EMS used by memory manager into the page frame
 298 = for general use.  This only needs to be called if you are keeping
 299 = other things in EMS.
 300 =
 301 ====================
 302 */
 303
 304 byte MM_MapEMS(global_game_variables_t *gvar)
 305 {
 306         byte    str[160];
 307         unsigned        EMSHandle;
 308         byte err;
 309         boolean errorflag=false;
 310         int     i;
 311         EMSHandle=gvar->mm.EMSHandle;
 312
 313         for (i=0;i<4/*MAPPAGES*/;i++)
 314         {
 315                 __asm {
 316                         mov     ah,EMS_MAPPAGE
 317                         mov     bx,[i]                  // logical page
 318                         mov     al,bl                   // physical page
 319                         mov     dx,[EMSHandle]  // handle
 320                         int     EMS_INT
 321                         or      ah,ah
 322                         jnz     error
 323                         jmp End
 324 #ifdef __BORLANDC__
 325                 }
 326 #endif
 327                         error:
 328 #ifdef __BORLANDC__
 329                 __asm {
 330 #endif
 331                         mov     err,ah
 332                         mov     errorflag,1
 333 #ifdef __BORLANDC__
 334                 }
 335 #endif
 336                         End:
 337 #ifdef __WATCOMC__
 338                 }
 339 #endif
 340                 if(errorflag==true)
 341                 {
 342                         strcpy(str,"MM_MapEMS: EMS error ");
 343                         MM_EMSerr(str, err);
 344                         printf("%s\n",str);
 345                         return err;
 346                 }
 347         }
 348         gvar->mmi.EMSmem = (i)*0x4000lu;
 349         return 0;
 350 }
 351
 352 byte MM_MapXEMS(global_game_variables_t *gvar)
 353 {
 354 //SUB EMS.MapXPages (PhysicalStart, LogicalStart, NumPages, Handle)
 355
 356         //Maps up to 4 logical EMS pages to physical pages in the page frame, where:
 357         //PhysicalStart = Physical page first logical page is mapped to
 358         //LogicalStart  = First logical page to map
 359         //NumPages      = Number of pages to map (1 to 4)
 360         //Handle        = EMS handle logical pages are allocated to
 361
 362   /*//Create a buffer containing the page information
 363 //  FOR x = 0 TO NumPages - 1
 364 //    MapInfo$ = MapInfo$ + MKI$(LogicalStart + x) + MKI$(PhysicalStart + x)
 365 //  NEXT*/
 366
 367 //  Regs.ax = 0x5000                           //Map the pages in the buffer
 368 //  Regs.cx = NumPages                         //to the pageframe
 369 //  Regs.dx = Handle
 370 //  Regs.ds = VARSEG(MapInfo$)
 371 //  Regs.si = SADD(MapInfo$)
 372 //  InterruptX 0x67, Regs, Regs
 373 //      EMS.Error = (Regs.ax AND 0xFF00&) \ 0x100  //Store the status code
 374
 375 //END SUB
 376         byte    str[160];
 377         byte err;
 378         word    EMSHandle;
 379         boolean errorflag=false;
 380         int     i;
 381         EMSHandle=gvar->mm.EMSHandle;
 382
 383         if(gvar->mm.EMSVer<0x40)
 384                 return 5;
 385
 386         for (i=0;i<MAPPAGES;i++)
 387         {
 388                 __asm {
 389                         mov     ah,EMS_MAPXPAGE
 390                         mov     cx,[i]                  // logical page
 391                         mov     al,bl                   // physical page
 392                         mov     dx,[EMSHandle]  // handle
 393                         int     EMS_INT
 394                         or      ah,ah
 395                         jnz     error
 396                         jmp End
 397 #ifdef __BORLANDC__
 398                 }
 399 #endif
 400                         error:
 401 #ifdef __BORLANDC__
 402                 __asm {
 403 #endif
 404                         mov     err,ah
 405                         mov     errorflag,1
 406 #ifdef __BORLANDC__
 407                 }
 408 #endif
 409                         End:
 410 #ifdef __WATCOMC__
 411                 }
 412 #endif
 413                 if(errorflag==true)
 414                 {
 415                         //strcpy(str,"MM_MapXEMS: EMS error 0x");
 416                         strcpy(str,"MM_MapXEMS: EMS error ");
 417                         //itoa(err,str2,16);
 418                         MM_EMSerr(str, err);
 419                         printf("%s\n",str);
 420                         //printf("%s%x\n",str, err);
 421                         //printf("FACK! %x\n", err);
 422                         return err;
 423                 }
 424         }
 425         gvar->mmi.EMSmem = (i)*0x4000lu;
 426         return 0;
 427 }
 428 #endif
 429 //==========================================================================
 430
 431 /*
 432 ======================
 433 =
 434 = MML_CheckForXMS
 435 =
 436 = Check for XMM driver
 437 =
 438 =======================
 439 */
 440
 441 boolean MML_CheckForXMS(void)
 442 {
 443         //numUMBs = 0;
 444         boolean errorflag=false;
 445
 446         __asm {
 447                 mov     ax,0x4300
 448                 int     0x2f                            // query status of installed diver
 449                 cmp     al,0x80
 450                 je      good
 451                 mov     errorflag,1
 452 #ifdef __BORLANDC__
 453         }
 454 #endif
 455                 good:
 456 #ifdef __WATCOMC__
 457         }
 458 #endif
 459         if(errorflag==true) return false;
 460         else return true;
 461 }
 462
 463 #ifndef __16_PM__
 464 /*
 465 ======================
 466 =
 467 = MML_SetupXMS
 468 =
 469 = Try to allocate all upper memory block
 470 =
 471 =======================
 472 */
 473
 474 void MML_SetupXMS(global_game_variables_t *gvar)
 475 {
 476         word    base,size;
 477
 478
 479         __asm {
 480                 mov     ax,0x4310
 481                 int     0x2f
 482                 mov     [WORD PTR XMSaddr],bx
 483                 mov     [WORD PTR XMSaddr+2],es         // function pointer to XMS driver
 484         }
 485 getmemory:
 486         __asm {
 487                 mov     ah,XMS_ALLOCUMB
 488                 mov     dx,0xffff                                       // try for largest block possible
 489                 //mov     ax,dx                                         // Set available Kbytes.
 490                 call    [DWORD PTR XMSaddr]
 491                 or      ax,ax
 492                 jnz     gotone
 493
 494                 cmp     bl,0xb0                                         // error: smaller UMB is available
 495                 jne     done;
 496
 497                 mov     ah,XMS_ALLOCUMB
 498                 call    [DWORD PTR XMSaddr]             // DX holds largest available UMB
 499                 or      ax,ax
 500                 jz      done                                            // another error...
 501 #ifdef __BORLANDC__
 502         }
 503 #endif
 504                 gotone:
 505 #ifdef __BORLANDC__
 506         __asm {
 507 #endif
 508                 mov     [base],bx
 509                 mov     [size],dx
 510 #ifdef __BORLANDC__
 511         }
 512 #endif
 513                 done:
 514 #ifdef __WATCOMC__
 515         }
 516 #endif
 517 //      printf("base=%u ", base); printf("size=%u\n", size);
 518         MML_UseSpace(base,size, gvar);
 519         gvar->mmi.XMSmem += size*16;
 520         gvar->mm.UMBbase[gvar->mm.numUMBs] = base;
 521         gvar->mm.numUMBs++;
 522         if(gvar->mm.numUMBs < MAXUMBS)
 523                 goto getmemory;
 524 }
 525
 526
 527 /*
 528 ======================
 529 =
 530 = MML_ShutdownXMS
 531 =
 532 ======================
 533 */
 534
 535 void MML_ShutdownXMS(global_game_variables_t *gvar)
 536 {
 537         int     i;
 538         unsigned        base;
 539
 540         for (i=0;i<gvar->mm.numUMBs;i++)
 541         {
 542                 base = gvar->mm.UMBbase[i];
 543                 __asm {
 544                         mov     ah,XMS_FREEUMB
 545                         mov     dx,[base]
 546                         call    [DWORD PTR XMSaddr]
 547                 }
 548         }
 549 }
 550 #endif
 551 //==========================================================================
 552
 553 /*
 554 ======================
 555 =
 556 = MML_UseSpace
 557 =
 558 = Marks a range of paragraphs as usable by the memory manager
 559 = This is used to mark space for the near heap, far heap, ems page frame,
 560 = and upper memory blocks
 561 =
 562 ======================
 563 */
 564
 565 /*
 566         extra = oldend - (segstart+seglength);
 567
 568         segmlen=extra;
 569
 570         //++++emsver stuff!
 571         if(segm>1)/// || extra>=0x10000lu)
 572         //if(extra>0xfffflu)
 573         {
 574                 scan->blob=segm;
 575
 576                 //MML_UseSpace(segstart, seglength, gvar);
 577
 578                 printf("MML_UseSpace: Segment spans two blocks!\n");
 579         //}
 580         printf("segm=%u         ", segm);
 581         printf("ex=%lu  ", extra);
 582         printf("old=%u  ", oldend);
 583         printf("start+seglen=%lu\n", segstart+seglength);
 584         printf("segsta=%x       ", segstart);
 585         printf("len=%lu ", scan->length);
 586         printf("seglen=%lu      ", seglength);
 587         printf("segmlen=%lu\n", segmlen);
 588         }
 589 //++++todo: linked list of segment!
 590 */
 591 void MML_UseSpace(word segstart, dword seglength, global_game_variables_t *gvar)
 592 {
 593         mmblocktype far *scan,far *last;
 594         word    oldend;
 595         sdword          extra;
 596         //word segm=1;
 597
 598         scan = last = gvar->mm.mmhead;
 599         gvar->mm.mmrover = gvar->mm.mmhead;             // reset rover to start of memory
 600
 601 //
 602 // search for the block that contains the range of segments
 603 //
 604         while (scan->start+scan->length < segstart)
 605         {
 606                 last = scan;
 607                 scan = scan->next;
 608         }
 609
 610 //
 611 // find out how many blocks it spans!
 612 //
 613         /*for(;seglength>=0x10000;seglength-=0xFFFF)
 614         {
 615                 //printf("      seglen=%lu\n", segmlen);
 616                 segm++;
 617         }*/
 618
 619 //
 620 // take the given range out of the block
 621 //
 622         oldend = scan->start + scan->length;
 623         extra = oldend - (segstart+((unsigned)seglength));
 624         if (extra < 0)
 625         {
 626                 printf("========================================\n");
 627                 printf("start=%x        ", scan->start);
 628                 printf("old=%u  ", oldend);
 629                 printf("start+seglen=%lu\n", segstart+seglength);
 630                 printf("segsta=%x       ", segstart);
 631                 printf("len=%lu ", scan->length);
 632                 printf("seglen=%lu      ", seglength);
 633                 printf("\n");
 634                 printf("MML_UseSpace: Segment spans two blocks! %d\n", extra);
 635                 printf("========================================\n");
 636                 //return;
 637         }
 638
 639         if (segstart == scan->start)
 640         {
 641                 last->next = scan->next;                        // unlink block
 642                 FREEBLOCK(scan);
 643                 scan = last;
 644         }
 645         else
 646                 scan->length = segstart-scan->start;    // shorten block
 647
 648         if (extra > 0)
 649         {
 650                 GETNEWBLOCK;
 651                 gvar->mm.mmnew->useptr = NULL;
 652
 653                 gvar->mm.mmnew->next = scan->next;
 654                 scan->next = gvar->mm.mmnew;
 655                 gvar->mm.mmnew->start = segstart+seglength;
 656                 gvar->mm.mmnew->length = extra;
 657                 gvar->mm.mmnew->attributes = LOCKBIT;
 658         }//else if(segm>0) goto segu;
 659
 660 }
 661
 662 //==========================================================================
 663
 664 /*
 665 ====================
 666 =
 667 = MML_ClearBlock
 668 =
 669 = We are out of blocks, so free a purgable block
 670 =
 671 ====================
 672 */
 673
 674 void MML_ClearBlock(global_game_variables_t *gvar)
 675 {
 676         mmblocktype far *scan;//,far *last;
 677
 678         scan = gvar->mm.mmhead->next;
 679
 680         while(scan)
 681         {
 682                 if(!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS))
 683                 {
 684                         MM_FreePtr(scan->useptr, gvar);
 685                         return;
 686                 }
 687                 scan = scan->next;
 688         }
 689
 690         printf("MM_ClearBlock: No purgable blocks!\n");
 691 }
 692
 693
 694 //==========================================================================
 695
 696 /*
 697 ===================
 698 =
 699 = MM_Startup
 700 =
 701 = Grabs all space from turbo with malloc/farmalloc
 702 = Allocates bufferseg misc buffer
 703 =
 704 ===================
 705 */
 706
 707 void MM_Startup(global_game_variables_t *gvar)
 708 {
 709         int i;
 710         //dword length,seglength;
 711         dword length; word seglength;
 712         void far        *start;
 713         word    segstart;//,endfree;
 714
 715         if(gvar->mm.mmstarted)
 716                 MM_Shutdown(gvar);
 717
 718         gvar->mm.mmstarted = true;
 719         gvar->mm.bombonerror = true;
 720
 721 //
 722 // set up the linked list (everything in the free list;
 723 //
 724         gvar->mm.mmhead = NULL;
 725         gvar->mm.mmfree = &(gvar->mm.mmblocks[0]);
 726         for(i=0;i<MAXBLOCKS-1;i++)
 727                 gvar->mm.mmblocks[i].next = &(gvar->mm.mmblocks[i+1]);
 728         gvar->mm.mmblocks[i].next = NULL;
 729
 730 //
 731 // locked block of all memory until we punch out free space
 732 //
 733         GETNEWBLOCK;
 734         gvar->mm.mmhead = gvar->mm.mmnew;                               // this will allways be the first node
 735         gvar->mm.mmnew->start = 0;
 736         gvar->mm.mmnew->length = 0xffff;
 737         gvar->mm.mmnew->attributes = LOCKBIT;
 738         gvar->mm.mmnew->next = NULL;
 739         gvar->mm.mmrover = gvar->mm.mmhead;
 740
 741 //
 742 // get all available near conventional memory segments
 743 //
 744 #ifdef __WATCOMC__
 745         _nheapgrow();
 746 #endif
 747         length=(word)_memavl();//(word)coreleft();
 748         //start = gvar->mm.nearheap = _fmalloc(length);
 749 #ifdef __WATCOMC__
 750         start = (void __far *)(gvar->mm.nearheap = _nmalloc(length));
 751 #endif
 752 #ifdef __BORLANDC__
 753         start = (void far *)(gvar->mm.nearheap = malloc(length));
 754 #endif
 755
 756         length -= 16-(FP_OFF(start)&15);
 757         length -= SAVENEARHEAP;
 758         seglength = length / 16;                        // now in paragraphs
 759         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 760         MML_UseSpace(segstart,seglength, gvar);
 761         gvar->mmi.nearheap = length;
 762         //0000printf("near:     start=%Fp       segstart=%x     seglen=%lu      len=%lu\n", start, segstart, (dword)seglength, length);
 763
 764 //
 765 // get all available far conventional memory segments
 766 //
 767 #ifdef __WATCOMC__
 768         _fheapgrow();
 769 #endif
 770 #ifdef __BORLANDC__
 771 //      printf("farcoreleft()                           %lu\n", farcoreleft());
 772 //      printf("(farcoreleft()+32)-_FCORELEFT   %d\n", (sword)((farcoreleft()+32)-_FCORELEFT));
 773 #endif
 774         length=_FCORELEFT;
 775         start = gvar->mm.farheap = _fmalloc(length);//start = gvar->mm.farheap = halloc(length, 1);
 776
 777         length -= 16-(FP_OFF(start)&15);
 778         length -= SAVEFARHEAP;
 779         seglength = length / 16;                        // now in paragraphs
 780         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 781         MML_UseSpace(segstart,seglength, gvar);
 782         gvar->mmi.farheap = length;
 783         //0000printf("far:      start=%Fp       segstart=%x     seglen=%lu      len=%lu\n", start, segstart, (dword)seglength, length);
 784
 785         gvar->mmi.mainmem = gvar->mmi.nearheap + gvar->mmi.farheap;
 786
 787 #if !defined(__16_PM__)// && defined(__WATCOMC__)
 788         if(!dbg_debugpm) {
 789 //
 790 // detect EMS and allocate up to 64K at page frame
 791 //
 792         gvar->mmi.EMSmem = 0;
 793 //goto emsskip; //0000
 794         for(i = 1;i < _argc;i++)
 795         {
 796                 if(US_CheckParm(_argv[i],ParmStringsexmm) == 0)
 797                         goto emsskip;                           // param NOEMS
 798         }
 799         if(MML_CheckForEMS())
 800         {
 801                 MML_SetupEMS(gvar);                                     // allocate space
 802                 //16_PM: EMS4! AND EMS 3.2 MASSIVE DATA HANDLMENT!
 803                 MML_UseSpace(gvar->mm.EMSPageFrame,(MAPPAGES)*0x4000lu, gvar);
 804                 //if(gvar->pm.emm.EMSVer<0x40)
 805                         MM_MapEMS(gvar);                                        // map in used pages
 806                 //else
 807                         //MM_MapXEMS(gvar);                                     // map in used pages
 808         }
 809
 810 //
 811 // detect XMS and get upper memory blocks
 812 //
 813 emsskip:
 814         gvar->mmi.XMSmem = 0;
 815 goto xmsskip;//0000
 816         for(i = 1;i < _argc;i++)
 817         {
 818                 if(US_CheckParm( _argv[i],ParmStringsexmm) == 0)
 819                         goto xmsskip;                           // param NOXMS
 820         }
 821         if(MML_CheckForXMS())
 822         {
 823                 MML_SetupXMS(gvar);                                     // allocate as many UMBs as possible
 824         }
 825
 826         }
 827 xmsskip:
 828 #endif
 829 //
 830 // allocate the misc buffer
 831 //
 832         gvar->mm.mmrover = gvar->mm.mmhead;             // start looking for space after low block
 833
 834         MM_GetPtr(&(gvar->mm.bufferseg),BUFFERSIZE, gvar);
 835 }
 836
 837 //==========================================================================
 838
 839 /*
 840 ====================
 841 =
 842 = MM_Shutdown
 843 =
 844 = Frees all conventional, EMS, and XMS allocated
 845 =
 846 ====================
 847 */
 848
 849 void MM_Shutdown(global_game_variables_t *gvar)
 850 {
 851         if(!(gvar->mm.mmstarted))
 852                 return;
 853
 854         _ffree(gvar->mm.farheap);//     printf("                far freed\n");
 855 #ifdef __WATCOMC__
 856         _nfree(gvar->mm.nearheap);//    printf("                near freed\n");
 857 #endif
 858 #ifdef __BORLANDC__
 859         free(gvar->mm.nearheap);//      printf("                near freed\n");
 860 #endif
 861 #ifndef __16_PM__
 862 #ifdef __DEBUG__
 863         if(!dbg_debugpm) {
 864 #endif
 865         if(MML_CheckForEMS()){ MML_ShutdownEMS(gvar); }//printf("               EMS freed\n"); }
 866         if(MML_CheckForXMS()){ MML_ShutdownXMS(gvar); }//printf("               XMS freed\n"); }
 867 #ifdef __DEBUG__
 868         }
 869 #endif
 870 #endif
 871 }
 872
 873 //==========================================================================
 874
 875 /*
 876 ====================
 877 =
 878 = MM_GetPtr
 879 =
 880 = Allocates an unlocked, unpurgable block
 881 =
 882 ====================
 883 */
 884
 885 void MM_GetPtr (memptr *baseptr, dword size, global_game_variables_t *gvar)
 886 {
 887         mmblocktype far *scan,far *lastscan,far *endscan,far *purge,far *next;
 888         int                     search;
 889         unsigned        needed,startseg;
 890
 891         needed = (size+15)/16;          // convert size from bytes to paragraphs
 892
 893         GETNEWBLOCK;                            // fill in start and next after a spot is found
 894         gvar->mm.mmnew->length = needed;
 895         gvar->mm.mmnew->useptr = baseptr;
 896         //if(gvar->mm.mmnew->useptr==NULL){
 897 #ifdef __DEBUG_MM__
 898         if(dbg_debugmm>0){
 899                 printf("MM_GetPtr\n");
 900                 //%04x
 901                 printf("        baseptr=%Fp     ", baseptr); printf("useptr=%Fp\n", gvar->mm.mmnew->useptr);
 902                 printf("        *baseptr=%Fp    ", *baseptr); printf("*useptr=%Fp\n", *(gvar->mm.mmnew->useptr));
 903                 printf("        &baseptr=%Fp    ", &baseptr); printf("&useptr=%Fp\n", &(gvar->mm.mmnew->useptr));
 904         }
 905 #endif
 906         //Quit(gvar, "gvar->mm.mmnew->useptr==NULL"); }
 907         gvar->mm.mmnew->attributes = BASEATTRIBUTES;
 908
 909 //tryagain:
 910         for (search = 0; search<3; search++)
 911         {
 912         //
 913         // first search:        try to allocate right after the rover, then on up
 914         // second search:       search from the head pointer up to the rover
 915         // third search:        compress memory, then scan from start
 916                 if (search == 1 && gvar->mm.mmrover == gvar->mm.mmhead)
 917                         search++;
 918
 919                 switch (search)
 920                 {
 921                 case 0:
 922                         lastscan = gvar->mm.mmrover;
 923                         scan = gvar->mm.mmrover->next;
 924                         endscan = NULL;
 925                         break;
 926                 case 1:
 927                         lastscan = gvar->mm.mmhead;
 928                         scan = gvar->mm.mmhead->next;
 929                         endscan = gvar->mm.mmrover;
 930                         break;
 931                 case 2:
 932                         MM_SortMem (gvar);
 933                         lastscan = gvar->mm.mmhead;
 934                         scan = gvar->mm.mmhead->next;
 935                         endscan = NULL;
 936                         break;
 937                 }
 938
 939                 startseg = lastscan->start + lastscan->length;
 940
 941                 while (scan != endscan)
 942                 {
 943                         if (scan->start - startseg >= needed)
 944                         {
 945                         //
 946                         // got enough space between the end of lastscan and
 947                         // the start of scan, so throw out anything in the middle
 948                         // and allocate the new block
 949                         //
 950                                 purge = lastscan->next;
 951                                 lastscan->next = gvar->mm.mmnew;
 952                                 gvar->mm.mmnew->start = *(unsigned *)baseptr = startseg;
 953                                 gvar->mm.mmnew->next = scan;
 954                                 while ( purge != scan)
 955                                 {       // free the purgable block
 956                                         next = purge->next;
 957                                         FREEBLOCK(purge);
 958                                         purge = next;           // purge another if not at scan
 959                                 }
 960                                 gvar->mm.mmrover = gvar->mm.mmnew;
 961                                 return; // good allocation!
 962                         }
 963
 964                         //
 965                         // if this block is purge level zero or locked, skip past it
 966                         //
 967                         if ( (scan->attributes & LOCKBIT)
 968                                 || !(scan->attributes & PURGEBITS) )
 969                         {
 970                                 lastscan = scan;
 971                                 startseg = lastscan->start + lastscan->length;
 972                         }
 973
 974
 975                         scan=scan->next;                // look at next line
 976                 }
 977         }
 978
 979         if (gvar->mm.bombonerror)
 980         {
 981 #ifdef __WATCOMC__
 982                 //heapdump();
 983 #endif
 984                 printf(OUT_OF_MEM_MSG,(size-gvar->mmi.nearheap));
 985                 Quit(gvar, "for stability reasons the program will shut down! wwww\n");
 986         }
 987         else
 988                 gvar->mm.mmerror = true;
 989 }
 990
 991 //==========================================================================
 992
 993 /*
 994 ====================
 995 =
 996 = MM_FreePtr
 997 =
 998 = Allocates an unlocked, unpurgable block
 999 =
1000 ====================
1001 */
1002
1003 void MM_FreePtr(memptr *baseptr, global_game_variables_t *gvar)
1004 {
1005         mmblocktype far *scan,far *last;
1006
1007         last = gvar->mm.mmhead;
1008         scan = last->next;
1009
1010         if(baseptr == gvar->mm.mmrover->useptr) // removed the last allocated block
1011                 gvar->mm.mmrover = gvar->mm.mmhead;
1012
1013         while(scan->useptr != baseptr && scan)
1014         {
1015                 last = scan;
1016                 scan = scan->next;
1017         }
1018
1019         if(!scan)
1020         {
1021                 Quit(gvar, "MM_FreePtr: Block not found!\n");
1022                 //printf("MM_FreePtr: Block not found!\n"); return;
1023         }
1024
1025         last->next = scan->next;
1026
1027         FREEBLOCK(scan);
1028 }
1029 //==========================================================================
1030
1031 /*
1032 =====================
1033 =
1034 = MM_SetPurge
1035 =
1036 = Sets the purge level for a block (locked blocks cannot be made purgable)
1037 =
1038 =====================
1039 */
1040
1041
1042 void MM_SetPurge(memptr *baseptr, int purge, global_game_variables_t *gvar)
1043 {
1044         mmblocktype far *start;
1045
1046         start = gvar->mm.mmrover;
1047
1048         do
1049         {
1050                 if(gvar->mm.mmrover->useptr == baseptr)
1051                         break;
1052
1053                 gvar->mm.mmrover = gvar->mm.mmrover->next;
1054
1055                 if(!gvar->mm.mmrover)
1056                         gvar->mm.mmrover = gvar->mm.mmhead;
1057                 else if(gvar->mm.mmrover == start)
1058                 {
1059                         Quit (gvar, "MM_SetPurge: Block not found!");
1060                         //return;
1061                 }
1062
1063         } while(1);
1064
1065         gvar->mm.mmrover->attributes &= ~PURGEBITS;
1066         gvar->mm.mmrover->attributes |= purge;
1067 }
1068
1069 //==========================================================================
1070
1071 /*
1072 =====================
1073 =
1074 = MM_SetLock
1075 =
1076 = Locks / unlocks the block
1077 =
1078 =====================
1079 */
1080
1081 void MM_SetLock(memptr *baseptr, boolean locked, global_game_variables_t *gvar)
1082 {
1083         mmblocktype far *start;
1084
1085         start = gvar->mm.mmrover;
1086
1087         do
1088         {
1089                 if(gvar->mm.mmrover->useptr == baseptr)
1090                         break;
1091
1092                 gvar->mm.mmrover = gvar->mm.mmrover->next;
1093
1094                 if(!gvar->mm.mmrover)
1095                         gvar->mm.mmrover = gvar->mm.mmhead;
1096                 else if(gvar->mm.mmrover == start)
1097                 {
1098                         Quit (gvar, "MM_SetLock: Block not found!");
1099                         //return;
1100                 }
1101
1102         } while(1);
1103
1104         gvar->mm.mmrover->attributes &= ~LOCKBIT;
1105         gvar->mm.mmrover->attributes |= locked*LOCKBIT;
1106 }
1107
1108 //==========================================================================
1109
1110 /*
1111 =====================
1112 =
1113 = MM_SortMem
1114 =
1115 = Throws out all purgable stuff and compresses movable blocks
1116 =
1117 =====================
1118 */
1119
1120 void MM_SortMem(global_game_variables_t *gvar)
1121 {
1122         mmblocktype far *scan,far *last,far *next;
1123         unsigned        start,length,source,dest;//++++,oldborder;
1124         //++++int                       playing;
1125
1126         //
1127         // lock down a currently playing sound
1128         //
1129 /*++++  playing = SD_SoundPlaying ();
1130         if(playing)
1131         {
1132                 switch (SoundMode)
1133                 {
1134                 case sdm_PC:
1135                         playing += STARTPCSOUNDS;
1136                         break;
1137                 case sdm_AdLib:
1138                         playing += STARTADLIBSOUNDS;
1139                         break;
1140                 }
1141                 MM_SetLock(&(memptr)audiosegs[playing],true);
1142         }
1143
1144
1145         SD_StopSound();*/
1146 //      oldborder = bordercolor;
1147 //      VW_ColorBorder (15);
1148
1149         if(beforesort)
1150                 beforesort();
1151
1152         scan = gvar->mm.mmhead;
1153
1154         last = NULL;            // shut up compiler warning
1155
1156         while(scan)
1157         {
1158                 if(scan->attributes & LOCKBIT)
1159                 {
1160                 //
1161                 // block is locked, so try to pile later blocks right after it
1162                 //
1163                         start = scan->start + scan->length;
1164                 }
1165                 else
1166                 {
1167                         if(scan->attributes & PURGEBITS)
1168                         {
1169                         //
1170                         // throw out the purgable block
1171                         //
1172                                 next = scan->next;
1173                                 FREEBLOCK(scan);
1174                                 //MM_FreeBlock(scan, gvar);
1175                                 last->next = next;
1176                                 scan = next;
1177                                 continue;
1178                         }
1179                         else
1180                         {
1181                         //
1182                         // push the non purgable block on top of the last moved block
1183                         //
1184                                 if(scan->start != start)
1185                                 {
1186                                         length = scan->length;
1187                                         source = scan->start;
1188                                         dest = start;
1189                                         while(length > 0xf00)
1190                                         {
1191                                                 movedata(source,0,dest,0,0xf00*16);
1192                                                 length -= 0xf00;
1193                                                 source += 0xf00;
1194                                                 dest += 0xf00;
1195                                         }
1196                                         movedata(source,0,dest,0,length*16);
1197
1198                                         scan->start = start;
1199                                         *(unsigned *)scan->useptr = start;
1200                                 }
1201                                 start = scan->start + scan->length;
1202                         }
1203                 }
1204
1205                 last = scan;
1206                 scan = scan->next;              // go to next block
1207         }
1208
1209         gvar->mm.mmrover = gvar->mm.mmhead;
1210
1211         if(aftersort)
1212                 aftersort();
1213
1214 //      VW_ColorBorder (oldborder);
1215
1216 /*++++  if(playing)
1217                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
1218 }
1219
1220 //==========================================================================
1221
1222 /*
1223 =====================
1224 =
1225 = MM_ShowMemory
1226 =
1227 =====================
1228 */
1229
1230 void MM_ShowMemory(global_game_variables_t *gvar)
1231 {
1232         mmblocktype far *scan;
1233         //word temp;
1234         sdword  end,owner;
1235         //word chx,chy;
1236         word w;
1237         //dword wwww;
1238         byte    scratch[160],scratch0[4096],str[16];//[[[[scratch1[160],
1239         //byte d = '#';
1240 //[[[[  VW_SetDefaultColors();
1241 //[[[[  VW_SetLineWidth(40);
1242 //++++mh        temp = bufferofs;
1243 //++++mh        bufferofs = 0;
1244 //[[[[  VW_SetScreen (0,0);
1245         scan = gvar->mm.mmhead;
1246         end = -1;
1247
1248         CA_OpenDebug (gvar);
1249         w=0;
1250         while(scan)
1251         {
1252                 strcpy(scratch, AARESET);
1253                 if(scan->attributes & PURGEBITS)
1254                         strcpy(scratch0, AAMAGENTA);            // dark purple = purgable
1255                 else
1256                         strcpy(scratch0, AABLUE);               // medium blue = non purgable
1257                 if(scan->attributes & LOCKBIT)
1258                         strcpy(scratch0, AARED);                // red = locked
1259                 if(scan->start<=end)
1260                 {
1261                         printf("\nend==%d\n\n", end);
1262                         strcat(scratch, "MM_ShowMemory: Memory block order currupted!\n");
1263                         strcat(scratch, "End's Size: ");
1264                         ultoa (end,str,10);
1265                         strcat (scratch,str);
1266                         strcat(scratch, "\nscan->start's Size: ");
1267                         ultoa (scan->start,str,10);
1268                         strcat (scratch,str);
1269                         write(gvar->handle.debughandle,scratch,strlen(scratch));
1270                         //modexprint(&page, chx, chy, 1, 0, 24, "\nMM_ShowMemory: Memory block order currupted!\n");
1271                         break;
1272                 }
1273                 end = scan->start+(scan->length)-1;
1274 //++++          chy = scan->start/320;
1275 //++++          chx = scan->start%320;
1276                                 //modexhlin(page, scan->start, (unsigned)end, chy, color);
1277                                 //for(chx=scan->start;chx+4>=(word)end;chx+=4)
1278                                 //{
1279 //++++                                  modexClearRegion(page, chx, chy, 4, 4, color);
1280                                 //}
1281 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1282                 for(w=(scan->start)/80;w<=end/80;w++)
1283                 {
1284                         //printf("+     %u      %lu\n", w, scan->length);
1285                         strcat(scratch0, "+");
1286                 }
1287                 //++==++==optional strcat(scratch0, AARESET); strcat(scratch0, AAGREY); strcat(scratch0,"_");
1288 //++++          VW_Plot(scan->start,0,15);
1289 //++++                          modexClearRegion(page, chx, chy, 4, 4, 15);
1290 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1291
1292                 //wwww=(dword)(scan->next->start)-(dword)scan->start;
1293                 //wwww=(dword)scan->start+(dword)(scan->next->start);
1294                 if (scan->next && scan->next->start >= end+1)
1295                 {
1296                         strcat(scratch0, AARESET);
1297                         //++==++==optional strcat(scratch0, "\n");
1298                         strcat(scratch0,AAGREEN);
1299                         for(w=(end+1)/80;w<=((scan->next->start-scan->start)/80);w++)
1300                         //for(w=(wwww)/80;w<=((end+1)/80);w++)
1301                         //for(w=(end+1)/80;w<=((wwww)/80);w++)
1302                         {
1303                                 //printf("0     %x      %u      %lu\n", scan->next->start, w, scan->length);
1304                                 strcat(scratch0,"0");
1305                         }
1306                         //printf("==================\n");
1307                         //printf("w=%u  wwww=%lu        start=%04x      next=%04x       end=%lu\n", w/80, wwww/80, scan->start, (scan->next->start), end+1);
1308                         //printf("==================\n");
1309                         strcat(scratch0, "\n");
1310                         //getch();
1311                 }/*else {//if(scan->next->start <= scan->start){
1312                         scan->next->start=scan->start+0x1000;
1313                         wwww=(dword)(scan->next->start)-(dword)scan->start;
1314                         strcat(scratch0, AARESET);
1315                         strcat(scratch0, "\n");
1316                         strcat(scratch0,AAGREEN);
1317                         for(w=(end+1);w<=(0x1000/80);w++)
1318                         {
1319                                 //printf("0     %x      %x      %u\n", scan->start, w);
1320                                 strcat(scratch0,"0");
1321                         }
1322                         printf("================\n");
1323                         printf("w=%x    start=%x        next=%x end=%u  %lu\n", w, scan->start, (scan->next->start), end+1, wwww);
1324                         printf("================\n");
1325                         getch();
1326                 }*/
1327                 strcat(scratch0, AARESET);
1328                 //strcat(scratch0,"\n");
1329                         //for(chx=scan->next->start;chx+4>=(word)end+1;chx+=4)
1330                         //{
1331 //                              chx+=scan->next->start;
1332 //                              modexClearRegion(page, chx, chy, 4, 4, 2);
1333                         //}
1334                                         //modexhlin(page, end+1,scan->next->start, chy, 0);
1335 /*              y = scan->start/320;
1336                 x = scan->start%320;
1337                 VW_Hlin(x,x+end,y,color);
1338                 VW_Plot(x,y,15);*/
1339 //++++                  VW_Hlin(x+end+1,x+(scan->next->start-scan->start),y,0); // black = free
1340                 strcat(scratch,"Seg:");
1341                 ultoa (scan->start,str,16);
1342                 strcat (scratch,str);
1343                 strcat (scratch,"\tSize:");
1344                 ultoa ((unsigned)scan->length,str,10);
1345                 strcat (scratch,str);
1346                 strcat (scratch,"\tOwner:0x");
1347                 owner = (unsigned)scan->useptr;
1348                 ultoa (owner,str,16);
1349                 strcat (scratch,str);
1350                 strcat (scratch,"\n");
1351                 write(gvar->handle.debughandle,scratch,strlen(scratch));
1352                 write(gvar->handle.debughandle,scratch0,strlen(scratch0));
1353 //modexprint(page, chx, chy, 1, 0, 24, &scratch);
1354 //++++chy+=4;
1355 //fprintf(stdout, "%s", scratch);
1356
1357                 scan = scan->next;
1358         }
1359         /*strcpy(scratch1, AARESET);
1360         strcat(scratch1, "========================================\n");
1361         strcat(scratch1, "near=  ");
1362         ultoa (*(gvar->mm.nearheap),str,10);
1363         strcat (scratch1,str);
1364         strcat(scratch1, "      far= ");
1365         ultoa (*(gvar->mm.farheap),str,10);
1366         strcat (scratch1,str);
1367         strcat(scratch1, "\n");
1368         //strcat(scratch1, "&near=      %Fp ", &(gvar->mm.nearheap));
1369         //strcat(scratch1, "&far=       %Fp", &(gvar->mm.farheap));
1370         //strcat(scratch1, "\n");
1371         strcat(scratch1, "========================================\n");
1372         write(gvar->handle.debughandle,scratch1,strlen(scratch1));*/
1373
1374
1375         CA_CloseDebug (gvar);
1376
1377 //++++mh        IN_Ack();
1378 //****  VW_SetLineWidth(64);
1379 //++++mh        bufferofs = temp;
1380 }
1381
1382 //==========================================================================
1383
1384 /*
1385 =====================
1386 =
1387 = MM_DumpData
1388 =
1389 =====================
1390 */
1391
1392 void MM_DumpData(global_game_variables_t *gvar)
1393 {
1394         mmblocktype far *scan,far *best;
1395         long    lowest,oldlowest;
1396         word    owner;
1397         byte    lock,purge;
1398         FILE    *dumpfile;
1399
1400 #ifdef __WATCOMC__
1401         _nfree(gvar->mm.nearheap);
1402 #endif
1403 #ifdef __BORLANDC__
1404         free(gvar->mm.nearheap);
1405 #endif
1406 #ifdef __BORLANDC__
1407                 dumpfile = fopen ("mmdump.16b","w");
1408 #endif
1409 #ifdef __WATCOMC__
1410                 dumpfile = fopen ("mmdump.16w","w");
1411 #endif
1412         if (!dumpfile){
1413                 printf("MM_DumpData: Couldn't open MMDUMP.16!\n");
1414                 return;
1415         }
1416
1417         lowest = -1;
1418         do
1419         {
1420                 oldlowest = lowest;
1421                 lowest = 0xffff;
1422
1423                 scan = gvar->mm.mmhead;
1424                 while (scan)
1425                 {
1426                         owner = (unsigned)scan->useptr;
1427
1428                         if (owner && owner<lowest && owner > oldlowest)
1429                         {
1430                                 best = scan;
1431                                 lowest = owner;
1432                         }
1433
1434                         scan = scan->next;
1435                 }
1436
1437                 if (lowest != 0xffff)
1438                 {
1439                         if (best->attributes & PURGEBITS)
1440                                 purge = 'P';
1441                         else
1442                                 purge = '-';
1443                         if (best->attributes & LOCKBIT)
1444                                 lock = 'L';
1445                         else
1446                                 lock = '-';
1447                         fprintf (dumpfile,"0x%p (%c%c) = %u\n"
1448                         ,(unsigned)lowest,lock,purge,best->length);
1449                 }
1450
1451         } while (lowest != 0xffff);
1452
1453         fclose(dumpfile);
1454         printf("MMDUMP.16 created.\n");
1455 }
1456
1457 //==========================================================================
1458
1459
1460 /*
1461 ======================
1462 =
1463 = MM_UnusedMemory
1464 =
1465 = Returns the total free space without purging
1466 =
1467 ======================
1468 */
1469
1470 dword MM_UnusedMemory(global_game_variables_t *gvar)
1471 {
1472         dword free;
1473         mmblocktype far *scan;
1474
1475         free = 0;
1476         scan = gvar->mm.mmhead;
1477
1478         while(scan->next)
1479         {
1480                 free += scan->next->start - (scan->start + scan->length);
1481                 scan = scan->next;
1482         }
1483
1484         return free*16lu;
1485 //      return free;
1486 }
1487
1488 //==========================================================================
1489
1490
1491 /*
1492 ======================
1493 =
1494 = MM_TotalFree
1495 =
1496 = Returns the total free space with purging
1497 =
1498 ======================
1499 */
1500
1501 dword MM_TotalFree(global_game_variables_t *gvar)
1502 {
1503         dword free;
1504         mmblocktype far *scan;
1505
1506         free = 0;
1507         scan = gvar->mm.mmhead;
1508
1509         while(scan->next)
1510         {
1511                 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1512                         free += scan->length;
1513                 free += scan->next->start - (scan->start + scan->length);
1514                 scan = scan->next;
1515         }
1516
1517         return free*16lu;
1518 //      return free;
1519 }
1520
1521 //==========================================================================
1522
1523 /*
1524 =====================
1525 =
1526 = MM_Report
1527 =
1528 =====================
1529 */
1530
1531 void MM_Report_(global_game_variables_t *gvar)
1532 {
1533         printf("========================================\n");
1534         printf("                MM_Report_\n");
1535         printf("========================================\n");
1536         if(MML_CheckForEMS())
1537         {
1538                 printf("        %cLIMEMS        %u\n", 0xC9, gvar->pm.emm.EMSPresent);
1539                 printf("        %c%cEMM v%x.%x available\n", 0xC7, 0xC4, gvar->pm.emm.EMSVer>>4,gvar->pm.emm.EMSVer&0x0F);
1540                 printf("        %c%ctotalEMSpages:      %u      ", 0xC7, 0xC4, gvar->pm.emm.totalEMSpages); printf("freeEMSpages:       %u\n", gvar->pm.emm.freeEMSpages);
1541                 printf("        %c%cEMSPageFrame:       %04x\n", 0xC7, 0xC4, gvar->pm.emm.EMSPageFrame);
1542                 printf("        %c%cEMSmem:     %lu\n", 0xD3, 0xC4, gvar->mmi.EMSmem);
1543         }
1544         if(MML_CheckForXMS())
1545         {
1546                 printf("        %cXMS   %u\n", 0xC9, gvar->pm.xmm.XMSPresent);
1547                 printf("        %c%cXMS v%x.%x available\n", 0xC7, 0xC4, XMSVer>>8,XMSVer&0x0F);
1548                 printf("        %c%cXMSDriver:  %Fp\n", 0xC7, 0xC4, XMSDriver);
1549                 printf("        %c%cXMSHandle:  %04x\n", 0xC7, 0xC4, gvar->pm.xmm.XMSHandle);
1550                 printf("        %c%cXMSmem:     %lu\n", 0xD3, 0xC4, gvar->mmi.XMSmem);
1551         }
1552         printf("        %cConv. %u\n", 0xC9, gvar->pm.mm.MainPresent); DebugMemory_(gvar, 0);
1553         //printf("mainmem:      %lu\n", gvar->mmi.mainmem);
1554         //printf("Total convmem:        %lu     ", gvar->mmi.mainmem); printf("TotalFree:       %lu     ", MM_TotalFree(gvar)+gvar->mmi.EMSmem+gvar->mmi.XMSmem+gvar->mmi.XMSmem); printf("TotalUsed:   %lu\n", gvar->mmi.mainmem);
1555         //printf("                      UnusedMemory:   %lu\n", MM_UnusedMemory(gvar));
1556         printf("nearheap:       %lu             ", gvar->mmi.nearheap); printf("farheap:        %lu\n", gvar->mmi.farheap);
1557 }
1558
1559 //==========================================================================
1560
1561 /*
1562 =====================
1563 =
1564 = MM_EMSerr
1565 =
1566 =====================
1567 */
1568
1569 void MM_EMSerr(byte *stri, byte err)
1570 {
1571         //Returns a text string describing the error code in EMS.Error.
1572         switch(err)
1573         {
1574                 case 0x0:
1575                         strcat(stri, "successful");
1576                 break;
1577                 case 0x80:
1578                         strcat(stri, "internal error");
1579                 break;
1580                 case 0x81:
1581                         strcat(stri, "hardware malfunction");
1582                 break;
1583                 case 0x82:
1584                         strcat(stri, "busy .. retry later");
1585                 break;
1586                 case 0x83:
1587                         strcat(stri, "invalid handle");
1588                 break;
1589                 case 0x84:
1590                         strcat(stri, "undefined function requested by application");
1591                 break;
1592                 case 0x85:
1593                         strcat(stri, "no more handles available");
1594                 break;
1595                 case 0x86:
1596                         strcat(stri, "error in save or restore of mapping context");
1597                 break;
1598                 case 0x87:
1599                         strcat(stri, "insufficient memory pages in system");
1600                 break;
1601                 case 0x88:
1602                         strcat(stri, "insufficient memory pages available");
1603                 break;
1604                 case 0x89:
1605                         strcat(stri, "zero pages requested");
1606                 break;
1607                 case 0x8A:
1608                         strcat(stri, "invalid logical page number encountered");
1609                 break;
1610                 case 0x8B:
1611                         strcat(stri, "invalid physical page number encountered");
1612                 break;
1613                 case 0x8C:
1614                         strcat(stri, "page-mapping hardware state save area is full");
1615                 break;
1616                 case 0x8D:
1617                         strcat(stri, "save of mapping context failed");
1618                 break;
1619                 case 0x8E:
1620                         strcat(stri, "restore of mapping context failed");
1621                 break;
1622                 case 0x8F:
1623                         strcat(stri, "undefined subfunction");
1624                 break;
1625                 case 0x90:
1626                         strcat(stri, "undefined attribute type");
1627                 break;
1628                 case 0x91:
1629                         strcat(stri, "feature not supported");
1630                 break;
1631                 case 0x92:
1632                         strcat(stri, "successful, but a portion of the source region has been overwritten");
1633                 break;
1634                 case 0x93:
1635                         strcat(stri, "length of source or destination region exceeds length of region allocated to either source or destination handle");
1636                 break;
1637                 case 0x94:
1638                         strcat(stri, "conventional and expanded memory regions overlap");
1639                 break;
1640                 case 0x95:
1641                         strcat(stri, "offset within logical page exceeds size of logical page");
1642                 break;
1643                 case 0x96:
1644                         strcat(stri, "region length exceeds 1 MB");
1645                 break;
1646                 case 0x97:
1647                         strcat(stri, "source and destination EMS regions have same handle and overlap");
1648                 break;
1649                 case 0x98:
1650                         strcat(stri, "memory source or destination type undefined");
1651                 break;
1652                 case 0x9A:
1653                         strcat(stri, "specified alternate map register or DMA register set not supported");
1654                 break;
1655                 case 0x9B:
1656                         strcat(stri, "all alternate map register or DMA register sets currently allocated");
1657                 break;
1658                 case 0x9C:
1659                         strcat(stri, "alternate map register or DMA register sets not supported");
1660                 break;
1661                 case 0x9D:
1662                         strcat(stri, "undefined or unallocated alternate map register or DMA register set");
1663                 break;
1664                 case 0x9E:
1665                         strcat(stri, "dedicated DMA channels not supported");
1666                 break;
1667                 case 0x9F:
1668                         strcat(stri, "specified dedicated DMA channel not supported");
1669                 break;
1670                 case 0xA0:
1671                         strcat(stri, "no such handle name");
1672                 break;
1673                 case 0xA1:
1674                         strcat(stri, "a handle found had no name, or duplicate handle name");
1675                 break;
1676                 case 0xA2:
1677                         strcat(stri, "attempted to wrap around 1M conventional address space");
1678                 break;
1679                 case 0xA3:
1680                         strcat(stri, "source array corrupted");
1681                 break;
1682                 case 0xA4:
1683                         strcat(stri, "operating system denied access");
1684                 break;
1685                 default:
1686                         strcat(stri, "undefined error");
1687         }
1688 }
1689
1690 //==========================================================================
1691
1692 /*
1693 =====================
1694 =
1695 = MM_BombOnError
1696 =
1697 =====================
1698 */
1699
1700 void MM_BombOnError(boolean bomb, global_game_variables_t *gvar)
1701 {
1702         gvar->mm.bombonerror = bomb;
1703 }
1704
1705 /*void MM_GetNewBlock(global_game_variables_t *gvar)
1706 {
1707         if(!gvar->mm.mmfree)
1708                 MML_ClearBlock(gvar);
1709         gvar->mm.mmnew=gvar->mm.mmfree;
1710         gvar->mm.mmfree=gvar->mm.mmfree->next;
1711         if(!(gvar->mm.mmnew=gvar->mm.mmfree))
1712         {
1713                 printf("MM_GETNEWBLOCK: No free blocks!\n");
1714                 return;
1715         }
1716         gvar->mm.mmfree=gvar->mm.mmfree->next;
1717 }
1718
1719 void MM_FreeBlock(mmblocktype *x, global_game_variables_t *gvar)
1720 {
1721         x->useptr=NULL;
1722         x->next=gvar->mm.mmfree;
1723         gvar->mm.mmfree=x;
1724 }*/
1725
1726 void xms_call(byte v, global_game_variables_t *gvar)
1727 {
1728         dword XMSDriver = gvar->pm.xmm.XMSDriver;
1729         __asm {
1730                 mov     ah,[v]
1731                 call [DWORD PTR XMSDriver]
1732         }
1733 }
1734
1735 /*void MM_seguin(void)
1736 {
1737         __asm {
1738                 push    ds
1739                 mov     ax,ds
1740                 inc             ax
1741                 mov     ds,ax
1742         }
1743 }
1744
1745 void MM_segude(void)
1746 {
1747         __asm {
1748                 pop ds
1749         }
1750 }*/
1751
1752 /*
1753 pull data from far and put it into ds var
1754 mov ax,es:si
1755 mov x,ax
1756 */
1757 /*
1758 ss stack segment
1759 sp top of stack
1760 bp bottem of stack
1761 */