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 = false;
  92         word            EMSPageFrame = 0;
  93         static char     emmname[] = "EMMXXXX0"; //fix by andrius4669
  94         __asm {
  95                 mov     dx,OFFSET emmname       //fix by andrius4669
  96                 mov     ax,0x3d00
  97                 int     0x21            // try to open EMMXXXX0 device
  98                 jc      error
  99
 100                 mov     bx,ax
 101                 mov     ax,0x4400
 102
 103                 int     0x21            // get device info
 104                 jc      error
 105
 106                 and     dx,0x80
 107                 jz      error
 108
 109                 mov     ax,0x4407
 110
 111                 int     0x21            // get status
 112                 jc      error
 113                 or      al,al
 114                 jz      error
 115
 116                 mov     ah,0x3e
 117                 int     0x21            // close handle
 118                 jc      error
 119
 120                 //
 121                 // pageframe check
 122                 //
 123                 mov     ah,EMS_GETFRAME
 124                 int     EMS_INT                 // find the page frame address
 125                 or      ah,ah
 126                 jnz     error
 127                 mov     [EMSPageFrame],bx
 128
 129                 //
 130                 // EMS is good
 131                 //
 132                 mov     emmcfems,1
 133                 jmp     End
 134 #ifdef __BORLANDC__
 135         }
 136 #endif
 137                 error:
 138 #ifdef __BORLANDC__
 139         __asm {
 140 #endif
 141                 //
 142                 // EMS is bad
 143                 //
 144                 mov     emmcfems,0
 145 #ifdef __BORLANDC__
 146         }
 147 #endif
 148                 End:
 149 #ifdef __WATCOMC__
 150         }
 151 #endif
 152
 153         //
 154         // Pageframe switch to determine if there is one!
 155         //
 156         if(!EMSPageFrame)
 157         {
 158                 emmcfems = false;
 159 #if defined(__DEBUG_PM__) || defined(__DEBUG_MM__)
 160                 printf("MML_CheckForEMS: EMS error No Pageframe!\nAddress detected to be %04x\n", EMSPageFrame);
 161 #endif
 162         }
 163         return(emmcfems);
 164 }
 165
 166 #ifndef __16_PM__
 167 /*
 168 ======================
 169 =
 170 = MML_SetupEMS
 171 =
 172 =======================
 173 */
 174
 175 byte MML_SetupEMS(global_game_variables_t *gvar)
 176 {
 177         byte    str[160];
 178         byte    err;
 179         boolean errorflag=false;
 180
 181         unsigned int EMSVer = 0;
 182         //byte  EMS_status;
 183         unsigned        totalEMSpages,freeEMSpages,EMSPageFrame,EMSpagesmapped,EMSHandle;
 184         totalEMSpages = freeEMSpages = EMSPageFrame = EMSpagesmapped = 0;
 185
 186         __asm {
 187                 mov     ah,EMS_STATUS
 188                 int     EMS_INT                                         // make sure EMS hardware is present
 189                 or      ah,ah
 190                 //mov   [EMS_status],ah
 191                 jnz     error
 192
 193                 mov     ah,EMS_VERSION
 194                 int     EMS_INT
 195                 or      ah,ah
 196                 jnz     error
 197                 mov     [EMSVer],ax                             //      set EMSVer
 198                 cmp     al,0x32                                         // only work on ems 3.2 or greater
 199                 jb      error
 200
 201                 mov     ah,EMS_GETFRAME
 202                 int     EMS_INT                                         // find the page frame address
 203                 or      ah,ah
 204                 jnz     error
 205                 mov     [EMSPageFrame],bx
 206
 207                 mov     ah,EMS_GETPAGES
 208                 int     EMS_INT                                         // find out how much EMS is there
 209                 or      ah,ah
 210                 jnz     error
 211                 mov     [totalEMSpages],dx
 212                 mov     [freeEMSpages],bx
 213                 or      bx,bx
 214                 jz      noEMS                                           // no EMS at all to allocate
 215                                                                                         //EXPAND DONG!!!!
 216                 cmp     [EMSVer],0x40
 217                 jb      low
 218                 cmp     bx,[freeEMSpages]
 219                 jle     getpages
 220                 mov     bx,[freeEMSpages]
 221                 jmp     getpages
 222 #ifdef __BORLANDC__
 223         }
 224 #endif
 225         low:
 226 #ifdef __BORLANDC__
 227         __asm {
 228 #endif
 229                 cmp     bx,4
 230                 jle     getpages                                        // there is only 1,2,3,or 4 pages
 231                 mov     bx,4                                            // we can't use more than 4 pages
 232 #ifdef __BORLANDC__
 233         }
 234 #endif
 235         getpages:
 236 #ifdef __BORLANDC__
 237         __asm {
 238 #endif
 239                 mov     [EMSpagesmapped],bx
 240                 mov     ah,EMS_ALLOCPAGES                       // allocate up to 64k of EMS
 241                 int     EMS_INT
 242                 or      ah,ah
 243                 jnz     error
 244                 mov     [EMSHandle],dx
 245                 jmp End
 246 #ifdef __BORLANDC__
 247         }
 248 #endif
 249         error:
 250 #ifdef __BORLANDC__
 251         __asm {
 252 #endif
 253                 mov     err,ah
 254                 mov     errorflag,1
 255                 jmp End
 256 #ifdef __BORLANDC__
 257         }
 258 #endif
 259 noEMS:
 260 End:
 261 #ifdef __WATCOMC__
 262         }
 263 #endif
 264         if(errorflag==true)
 265         {
 266                 strcpy(str,"MM_SetupEMS: EMS error ");
 267                 MM_EMSerr(str, err);
 268                 printf("%s\n",str);
 269                 return err;
 270         }
 271         gvar->mm.totalEMSpages=totalEMSpages;
 272         gvar->mm.freeEMSpages=freeEMSpages;
 273         gvar->mm.EMSPageFrame=EMSPageFrame;
 274         gvar->mm.EMSpagesmapped=EMSpagesmapped;
 275         gvar->mm.EMSHandle=EMSHandle;
 276         gvar->mm.EMSVer=EMSVer;
 277         return 0;
 278 }
 279
 280
 281 /*
 282 ======================
 283 =
 284 = MML_ShutdownEMS
 285 =
 286 =======================
 287 */
 288
 289 void MML_ShutdownEMS(global_game_variables_t *gvar)
 290 {
 291         boolean errorflag=false;
 292         unsigned EMSHandle=gvar->mm.EMSHandle;
 293
 294         if(!EMSHandle)
 295                 return;
 296         __asm {
 297                 mov     ah,EMS_FREEPAGES
 298                 mov     dx,[EMSHandle]
 299                 int     EMS_INT
 300                 or      ah,ah
 301                 jz      ok
 302                 mov     errorflag,1
 303 #ifdef __BORLANDC__
 304         }
 305 #endif
 306                 ok:
 307 #ifdef __WATCOMC__
 308         }
 309 #endif
 310         if(errorflag==true)
 311                 Quit (gvar, "MML_ShutdownEMS: Error freeing EMS!\n");   //++++ add something
 312 }
 313
 314 /*
 315 ====================
 316 =
 317 = MM_MapEMS
 318 =
 319 = Maps the 64k of EMS used by memory manager into the page frame
 320 = for general use.  This only needs to be called if you are keeping
 321 = other things in EMS.
 322 =
 323 ====================
 324 */
 325
 326 byte MM_MapEMS(global_game_variables_t *gvar)
 327 {
 328         byte    str[160];
 329         unsigned        EMSHandle;
 330         byte err;
 331         boolean errorflag=false;
 332         int     i;
 333         EMSHandle=gvar->mm.EMSHandle;
 334
 335         for (i=0;i<4/*MAPPAGES*/;i++)
 336         {
 337                 __asm {
 338                         mov     ah,EMS_MAPPAGE
 339                         mov     bx,[i]                  // logical page
 340                         mov     al,bl                   // physical page
 341                         mov     dx,[EMSHandle]  // handle
 342                         int     EMS_INT
 343                         or      ah,ah
 344                         jnz     error
 345                         jmp End
 346 #ifdef __BORLANDC__
 347                 }
 348 #endif
 349                         error:
 350 #ifdef __BORLANDC__
 351                 __asm {
 352 #endif
 353                         mov     err,ah
 354                         mov     errorflag,1
 355 #ifdef __BORLANDC__
 356                 }
 357 #endif
 358                         End:
 359 #ifdef __WATCOMC__
 360                 }
 361 #endif
 362                 if(errorflag==true)
 363                 {
 364                         strcpy(str,"MM_MapEMS: EMS error ");
 365                         MM_EMSerr(str, err);
 366                         printf("%s\n",str);
 367                         return err;
 368                 }
 369         }
 370         gvar->mmi.EMSmem = (i)*0x4000lu;
 371         return 0;
 372 }
 373
 374 byte MM_MapXEMS(global_game_variables_t *gvar)
 375 {
 376 //SUB EMS.MapXPages (PhysicalStart, LogicalStart, NumPages, Handle)
 377
 378         //Maps up to 4 logical EMS pages to physical pages in the page frame, where:
 379         //PhysicalStart = Physical page first logical page is mapped to
 380         //LogicalStart  = First logical page to map
 381         //NumPages      = Number of pages to map (1 to 4)
 382         //Handle        = EMS handle logical pages are allocated to
 383
 384   /*//Create a buffer containing the page information
 385 //  FOR x = 0 TO NumPages - 1
 386 //    MapInfo$ = MapInfo$ + MKI$(LogicalStart + x) + MKI$(PhysicalStart + x)
 387 //  NEXT*/
 388
 389 //  Regs.ax = 0x5000                           //Map the pages in the buffer
 390 //  Regs.cx = NumPages                         //to the pageframe
 391 //  Regs.dx = Handle
 392 //  Regs.ds = VARSEG(MapInfo$)
 393 //  Regs.si = SADD(MapInfo$)
 394 //  InterruptX 0x67, Regs, Regs
 395 //      EMS.Error = (Regs.ax AND 0xFF00&) \ 0x100  //Store the status code
 396
 397 //END SUB
 398         byte    str[160];
 399         byte err;
 400         word    EMSHandle;
 401         boolean errorflag=false;
 402         int     i;
 403         EMSHandle=gvar->mm.EMSHandle;
 404
 405         if(gvar->mm.EMSVer<0x40)
 406                 return 5;
 407
 408         for (i=0;i<MAPPAGES;i++)
 409         {
 410                 __asm {
 411                         mov     ah,EMS_MAPXPAGE
 412                         mov     cx,[i]                  // logical page
 413                         mov     al,bl                   // physical page
 414                         mov     dx,[EMSHandle]  // handle
 415                         int     EMS_INT
 416                         or      ah,ah
 417                         jnz     error
 418                         jmp End
 419 #ifdef __BORLANDC__
 420                 }
 421 #endif
 422                         error:
 423 #ifdef __BORLANDC__
 424                 __asm {
 425 #endif
 426                         mov     err,ah
 427                         mov     errorflag,1
 428 #ifdef __BORLANDC__
 429                 }
 430 #endif
 431                         End:
 432 #ifdef __WATCOMC__
 433                 }
 434 #endif
 435                 if(errorflag==true)
 436                 {
 437                         //strcpy(str,"MM_MapXEMS: EMS error 0x");
 438                         strcpy(str,"MM_MapXEMS: EMS error ");
 439                         //itoa(err,str2,16);
 440                         MM_EMSerr(str, err);
 441                         printf("%s\n",str);
 442                         //printf("%s%x\n",str, err);
 443                         //printf("FACK! %x\n", err);
 444                         return err;
 445                 }
 446         }
 447         gvar->mmi.EMSmem = (i)*0x4000lu;
 448         return 0;
 449 }
 450 #endif
 451 //==========================================================================
 452
 453 /*
 454 ======================
 455 =
 456 = MML_CheckForXMS
 457 =
 458 = Check for XMM driver
 459 =
 460 =======================
 461 */
 462
 463 boolean MML_CheckForXMS(void)
 464 {
 465         //numUMBs = 0;
 466         boolean errorflag=false;
 467
 468         __asm {
 469                 mov     ax,0x4300
 470                 int     0x2f                            // query status of installed diver
 471                 cmp     al,0x80
 472                 je      good
 473                 mov     errorflag,1
 474 #ifdef __BORLANDC__
 475         }
 476 #endif
 477                 good:
 478 #ifdef __WATCOMC__
 479         }
 480 #endif
 481         if(errorflag==true) return false;
 482         else return true;
 483 }
 484
 485 #ifndef __16_PM__
 486 /*
 487 ======================
 488 =
 489 = MML_SetupXMS
 490 =
 491 = Try to allocate all upper memory block
 492 =
 493 =======================
 494 */
 495
 496 void MML_SetupXMS(global_game_variables_t *gvar)
 497 {
 498         word    base,size;
 499
 500
 501         __asm {
 502                 mov     ax,0x4310
 503                 int     0x2f
 504                 mov     [WORD PTR XMSaddr],bx
 505                 mov     [WORD PTR XMSaddr+2],es         // function pointer to XMS driver
 506         }
 507 getmemory:
 508         __asm {
 509                 mov     ah,XMS_ALLOCUMB
 510                 mov     dx,0xffff                                       // try for largest block possible
 511                 //mov     ax,dx                                         // Set available Kbytes.
 512                 call    [DWORD PTR XMSaddr]
 513                 or      ax,ax
 514                 jnz     gotone
 515
 516                 cmp     bl,0xb0                                         // error: smaller UMB is available
 517                 jne     done;
 518
 519                 mov     ah,XMS_ALLOCUMB
 520                 call    [DWORD PTR XMSaddr]             // DX holds largest available UMB
 521                 or      ax,ax
 522                 jz      done                                            // another error...
 523 #ifdef __BORLANDC__
 524         }
 525 #endif
 526                 gotone:
 527 #ifdef __BORLANDC__
 528         __asm {
 529 #endif
 530                 mov     [base],bx
 531                 mov     [size],dx
 532 #ifdef __BORLANDC__
 533         }
 534 #endif
 535                 done:
 536 #ifdef __WATCOMC__
 537         }
 538 #endif
 539 //      printf("base=%u ", base); printf("size=%u\n", size);
 540         MML_UseSpace(base,size, gvar);
 541         gvar->mmi.XMSmem += size*16;
 542         gvar->mm.UMBbase[gvar->mm.numUMBs] = base;
 543         gvar->mm.numUMBs++;
 544         if(gvar->mm.numUMBs < MAXUMBS)
 545                 goto getmemory;
 546 }
 547
 548
 549 /*
 550 ======================
 551 =
 552 = MML_ShutdownXMS
 553 =
 554 ======================
 555 */
 556
 557 void MML_ShutdownXMS(global_game_variables_t *gvar)
 558 {
 559         int     i;
 560         unsigned        base;
 561
 562         for (i=0;i<gvar->mm.numUMBs;i++)
 563         {
 564                 base = gvar->mm.UMBbase[i];
 565                 __asm {
 566                         mov     ah,XMS_FREEUMB
 567                         mov     dx,[base]
 568                         call    [DWORD PTR XMSaddr]
 569                 }
 570         }
 571 }
 572 #endif
 573 //==========================================================================
 574
 575 /*
 576 ======================
 577 =
 578 = MML_UseSpace
 579 =
 580 = Marks a range of paragraphs as usable by the memory manager
 581 = This is used to mark space for the near heap, far heap, ems page frame,
 582 = and upper memory blocks
 583 =
 584 ======================
 585 */
 586
 587 /*
 588         extra = oldend - (segstart+seglength);
 589
 590         segmlen=extra;
 591
 592         //++++emsver stuff!
 593         if(segm>1)/// || extra>=0x10000lu)
 594         //if(extra>0xfffflu)
 595         {
 596                 scan->blob=segm;
 597
 598                 //MML_UseSpace(segstart, seglength, gvar);
 599
 600                 printf("MML_UseSpace: Segment spans two blocks!\n");
 601         //}
 602         printf("segm=%u         ", segm);
 603         printf("ex=%lu  ", extra);
 604         printf("old=%u  ", oldend);
 605         printf("start+seglen=%lu\n", segstart+seglength);
 606         printf("segsta=%x       ", segstart);
 607         printf("len=%lu ", scan->length);
 608         printf("seglen=%lu      ", seglength);
 609         printf("segmlen=%lu\n", segmlen);
 610         }
 611 //++++todo: linked list of segment!
 612 */
 613 void MML_UseSpace(word segstart, dword seglength, global_game_variables_t *gvar)
 614 {
 615         mmblocktype far *scan,far *last;
 616         word    oldend;
 617         sdword          extra;
 618         //word segm=1;
 619
 620         scan = last = gvar->mm.mmhead;
 621         gvar->mm.mmrover = gvar->mm.mmhead;             // reset rover to start of memory
 622
 623 //
 624 // search for the block that contains the range of segments
 625 //
 626         while (scan->start+scan->length < segstart)
 627         {
 628                 last = scan;
 629                 scan = scan->next;
 630         }
 631
 632 //
 633 // find out how many blocks it spans!
 634 //
 635         /*for(;seglength>=0x10000;seglength-=0xFFFF)
 636         {
 637                 //printf("      seglen=%lu\n", segmlen);
 638                 segm++;
 639         }*/
 640
 641 //
 642 // take the given range out of the block
 643 //
 644         oldend = scan->start + scan->length;
 645         extra = oldend - (segstart+((unsigned)seglength));
 646         if (extra < 0)
 647         {
 648                 printf("========================================\n");
 649                 printf("start=%x        ", scan->start);
 650                 printf("old=%u  ", oldend);
 651                 printf("start+seglen=%lu\n", segstart+seglength);
 652                 printf("segsta=%x       ", segstart);
 653                 printf("len=%lu ", scan->length);
 654                 printf("seglen=%lu      ", seglength);
 655                 printf("\n");
 656                 printf("MML_UseSpace: Segment spans two blocks! %d\n", extra);
 657                 printf("========================================\n");
 658                 //return;
 659         }
 660
 661         if (segstart == scan->start)
 662         {
 663                 last->next = scan->next;                        // unlink block
 664                 FREEBLOCK(scan);
 665                 scan = last;
 666         }
 667         else
 668                 scan->length = segstart-scan->start;    // shorten block
 669
 670         if (extra > 0)
 671         {
 672                 GETNEWBLOCK;
 673                 gvar->mm.mmnew->useptr = NULL;
 674
 675                 gvar->mm.mmnew->next = scan->next;
 676                 scan->next = gvar->mm.mmnew;
 677                 gvar->mm.mmnew->start = segstart+seglength;
 678                 gvar->mm.mmnew->length = extra;
 679                 gvar->mm.mmnew->attributes = LOCKBIT;
 680         }//else if(segm>0) goto segu;
 681
 682 }
 683
 684 //==========================================================================
 685
 686 /*
 687 ====================
 688 =
 689 = MML_ClearBlock
 690 =
 691 = We are out of blocks, so free a purgable block
 692 =
 693 ====================
 694 */
 695
 696 void MML_ClearBlock(global_game_variables_t *gvar)
 697 {
 698         mmblocktype far *scan;//,far *last;
 699
 700         scan = gvar->mm.mmhead->next;
 701
 702         while(scan)
 703         {
 704                 if(!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS))
 705                 {
 706                         MM_FreePtr(scan->useptr, gvar);
 707                         return;
 708                 }
 709                 scan = scan->next;
 710         }
 711
 712         printf("MM_ClearBlock: No purgable blocks!\n");
 713 }
 714
 715
 716 //==========================================================================
 717
 718 /*
 719 ===================
 720 =
 721 = MM_Startup
 722 =
 723 = Grabs all space from turbo with malloc/farmalloc
 724 = Allocates bufferseg misc buffer
 725 =
 726 ===================
 727 */
 728
 729 void MM_Startup(global_game_variables_t *gvar)
 730 {
 731         int i;
 732         //dword length,seglength;
 733         dword length; word seglength;
 734         void far        *start;
 735         word    segstart;//,endfree;
 736
 737         if(gvar->mm.mmstarted)
 738                 MM_Shutdown(gvar);
 739
 740         gvar->mm.mmstarted = true;
 741         gvar->mm.bombonerror = true;
 742
 743 //
 744 // set up the linked list (everything in the free list;
 745 //
 746         gvar->mm.mmhead = NULL;
 747         gvar->mm.mmfree = &(gvar->mm.mmblocks[0]);
 748         for(i=0;i<MAXBLOCKS-1;i++)
 749                 gvar->mm.mmblocks[i].next = &(gvar->mm.mmblocks[i+1]);
 750         gvar->mm.mmblocks[i].next = NULL;
 751
 752 //
 753 // locked block of all memory until we punch out free space
 754 //
 755         GETNEWBLOCK;
 756         gvar->mm.mmhead = gvar->mm.mmnew;                               // this will allways be the first node
 757         gvar->mm.mmnew->start = 0;
 758         gvar->mm.mmnew->length = 0xffff;
 759         gvar->mm.mmnew->attributes = LOCKBIT;
 760         gvar->mm.mmnew->next = NULL;
 761         gvar->mm.mmrover = gvar->mm.mmhead;
 762
 763 //
 764 // get all available near conventional memory segments
 765 //
 766 #ifdef __WATCOMC__
 767         _nheapgrow();
 768 #endif
 769         length=(word)_memavl();//(word)coreleft();
 770         //start = gvar->mm.nearheap = _fmalloc(length);
 771 #ifdef __WATCOMC__
 772         start = (void __far *)(gvar->mm.nearheap = _nmalloc(length));
 773 #endif
 774 #ifdef __BORLANDC__
 775         start = (void far *)(gvar->mm.nearheap = malloc(length));
 776 #endif
 777
 778         length -= 16-(FP_OFF(start)&15);
 779         length -= SAVENEARHEAP;
 780         seglength = length / 16;                        // now in paragraphs
 781         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 782         MML_UseSpace(segstart,seglength, gvar);
 783         gvar->mmi.nearheap = length;
 784         //0000printf("near:     start=%Fp       segstart=%x     seglen=%lu      len=%lu\n", start, segstart, (dword)seglength, length);
 785
 786 //
 787 // get all available far conventional memory segments
 788 //
 789 #ifdef __WATCOMC__
 790         _fheapgrow();
 791 #endif
 792 #ifdef __BORLANDC__
 793 //      printf("farcoreleft()                           %lu\n", farcoreleft());
 794 //      printf("(farcoreleft()+32)-_FCORELEFT   %d\n", (sword)((farcoreleft()+32)-_FCORELEFT));
 795 #endif
 796         length=_FCORELEFT;
 797         start = gvar->mm.farheap = _fmalloc(length);//start = gvar->mm.farheap = halloc(length, 1);
 798
 799         length -= 16-(FP_OFF(start)&15);
 800         length -= SAVEFARHEAP;
 801         seglength = length / 16;                        // now in paragraphs
 802         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 803         MML_UseSpace(segstart,seglength, gvar);
 804         gvar->mmi.farheap = length;
 805         //0000printf("far:      start=%Fp       segstart=%x     seglen=%lu      len=%lu\n", start, segstart, (dword)seglength, length);
 806
 807         gvar->mmi.mainmem = gvar->mmi.nearheap + gvar->mmi.farheap;
 808
 809 #if !defined(__16_PM__)// && defined(__WATCOMC__)
 810         if(!dbg_debugpm) {
 811 //
 812 // detect EMS and allocate up to 64K at page frame
 813 //
 814         gvar->mmi.EMSmem = 0;
 815 //goto emsskip; //0000
 816         for(i = 1;i < _argc;i++)
 817         {
 818                 if(US_CheckParm(_argv[i],ParmStringsexmm) == 0)
 819                         goto emsskip;                           // param NOEMS
 820         }
 821         if(MML_CheckForEMS())
 822         {
 823                 MML_SetupEMS(gvar);                                     // allocate space
 824                 //16_PM: EMS4! AND EMS 3.2 MASSIVE DATA HANDLMENT!
 825                 MML_UseSpace(gvar->mm.EMSPageFrame,(MAPPAGES)*0x4000lu, gvar);
 826                 //if(gvar->pm.emm.EMSVer<0x40)
 827                         MM_MapEMS(gvar);                                        // map in used pages
 828                 //else
 829                         //MM_MapXEMS(gvar);                                     // map in used pages
 830         }
 831
 832 //
 833 // detect XMS and get upper memory blocks
 834 //
 835 emsskip:
 836         gvar->mmi.XMSmem = 0;
 837 goto xmsskip;//0000
 838         for(i = 1;i < _argc;i++)
 839         {
 840                 if(US_CheckParm( _argv[i],ParmStringsexmm) == 0)
 841                         goto xmsskip;                           // param NOXMS
 842         }
 843         if(MML_CheckForXMS())
 844         {
 845                 MML_SetupXMS(gvar);                                     // allocate as many UMBs as possible
 846         }
 847
 848         }
 849 xmsskip:
 850 #endif
 851 //
 852 // allocate the misc buffer
 853 //
 854         gvar->mm.mmrover = gvar->mm.mmhead;             // start looking for space after low block
 855
 856         MM_GetPtr(&(gvar->mm.bufferseg),BUFFERSIZE, gvar);
 857 }
 858
 859 //==========================================================================
 860
 861 /*
 862 ====================
 863 =
 864 = MM_Shutdown
 865 =
 866 = Frees all conventional, EMS, and XMS allocated
 867 =
 868 ====================
 869 */
 870
 871 void MM_Shutdown(global_game_variables_t *gvar)
 872 {
 873         if(!(gvar->mm.mmstarted))
 874                 return;
 875
 876         _ffree(gvar->mm.farheap);//     printf("                far freed\n");
 877 #ifdef __WATCOMC__
 878         _nfree(gvar->mm.nearheap);//    printf("                near freed\n");
 879 #endif
 880 #ifdef __BORLANDC__
 881         free(gvar->mm.nearheap);//      printf("                near freed\n");
 882 #endif
 883 #ifndef __16_PM__
 884 #ifdef __DEBUG__
 885         if(!dbg_debugpm) {
 886 #endif
 887         if(MML_CheckForEMS()){ MML_ShutdownEMS(gvar); }//printf("               EMS freed\n"); }
 888         if(MML_CheckForXMS()){ MML_ShutdownXMS(gvar); }//printf("               XMS freed\n"); }
 889 #ifdef __DEBUG__
 890         }
 891 #endif
 892 #endif
 893 }
 894
 895 //==========================================================================
 896
 897 /*
 898 ====================
 899 =
 900 = MM_GetPtr
 901 =
 902 = Allocates an unlocked, unpurgable block
 903 =
 904 ====================
 905 */
 906
 907 void MM_GetPtr (memptr *baseptr, dword size, global_game_variables_t *gvar)
 908 {
 909         mmblocktype far *scan,far *lastscan,far *endscan,far *purge,far *next;
 910         int                     search;
 911         unsigned        needed,startseg;
 912
 913         needed = (size+15)/16;          // convert size from bytes to paragraphs
 914
 915         GETNEWBLOCK;                            // fill in start and next after a spot is found
 916         gvar->mm.mmnew->length = needed;
 917         gvar->mm.mmnew->useptr = baseptr;
 918         //if(gvar->mm.mmnew->useptr==NULL){
 919 #ifdef __DEBUG_MM__
 920         if(dbg_debugmm>0){
 921                 printf("MM_GetPtr\n");
 922                 //%04x
 923                 printf("        baseptr=%Fp     ", baseptr); printf("useptr=%Fp\n", gvar->mm.mmnew->useptr);
 924                 printf("        *baseptr=%Fp    ", *baseptr); printf("*useptr=%Fp\n", *(gvar->mm.mmnew->useptr));
 925                 printf("        &baseptr=%Fp    ", &baseptr); printf("&useptr=%Fp\n", &(gvar->mm.mmnew->useptr));
 926         }
 927 #endif
 928         //Quit(gvar, "gvar->mm.mmnew->useptr==NULL"); }
 929         gvar->mm.mmnew->attributes = BASEATTRIBUTES;
 930
 931 //tryagain:
 932         for (search = 0; search<3; search++)
 933         {
 934         //
 935         // first search:        try to allocate right after the rover, then on up
 936         // second search:       search from the head pointer up to the rover
 937         // third search:        compress memory, then scan from start
 938                 if (search == 1 && gvar->mm.mmrover == gvar->mm.mmhead)
 939                         search++;
 940
 941                 switch (search)
 942                 {
 943                 case 0:
 944                         lastscan = gvar->mm.mmrover;
 945                         scan = gvar->mm.mmrover->next;
 946                         endscan = NULL;
 947                         break;
 948                 case 1:
 949                         lastscan = gvar->mm.mmhead;
 950                         scan = gvar->mm.mmhead->next;
 951                         endscan = gvar->mm.mmrover;
 952                         break;
 953                 case 2:
 954                         MM_SortMem (gvar);
 955                         lastscan = gvar->mm.mmhead;
 956                         scan = gvar->mm.mmhead->next;
 957                         endscan = NULL;
 958                         break;
 959                 }
 960
 961                 startseg = lastscan->start + lastscan->length;
 962
 963                 while (scan != endscan)
 964                 {
 965                         if (scan->start - startseg >= needed)
 966                         {
 967                         //
 968                         // got enough space between the end of lastscan and
 969                         // the start of scan, so throw out anything in the middle
 970                         // and allocate the new block
 971                         //
 972                                 purge = lastscan->next;
 973                                 lastscan->next = gvar->mm.mmnew;
 974                                 gvar->mm.mmnew->start = *(unsigned *)baseptr = startseg;
 975                                 gvar->mm.mmnew->next = scan;
 976                                 while ( purge != scan)
 977                                 {       // free the purgable block
 978                                         next = purge->next;
 979                                         FREEBLOCK(purge);
 980                                         purge = next;           // purge another if not at scan
 981                                 }
 982                                 gvar->mm.mmrover = gvar->mm.mmnew;
 983                                 return; // good allocation!
 984                         }
 985
 986                         //
 987                         // if this block is purge level zero or locked, skip past it
 988                         //
 989                         if ( (scan->attributes & LOCKBIT)
 990                                 || !(scan->attributes & PURGEBITS) )
 991                         {
 992                                 lastscan = scan;
 993                                 startseg = lastscan->start + lastscan->length;
 994                         }
 995
 996
 997                         scan=scan->next;                // look at next line
 998                 }
 999         }
1000
1001         if (gvar->mm.bombonerror)
1002         {
1003 #ifdef __WATCOMC__
1004                 //heapdump();
1005 #endif
1006                 printf(OUT_OF_MEM_MSG,(size-gvar->mmi.nearheap));
1007                 Quit(gvar, "for stability reasons the program will shut down! wwww\n");
1008         }
1009         else
1010                 gvar->mm.mmerror = true;
1011 }
1012
1013 //==========================================================================
1014
1015 /*
1016 ====================
1017 =
1018 = MM_FreePtr
1019 =
1020 = Allocates an unlocked, unpurgable block
1021 =
1022 ====================
1023 */
1024
1025 void MM_FreePtr(memptr *baseptr, global_game_variables_t *gvar)
1026 {
1027         mmblocktype far *scan,far *last;
1028
1029         last = gvar->mm.mmhead;
1030         scan = last->next;
1031
1032         if(baseptr == gvar->mm.mmrover->useptr) // removed the last allocated block
1033                 gvar->mm.mmrover = gvar->mm.mmhead;
1034
1035         while(scan->useptr != baseptr && scan)
1036         {
1037                 last = scan;
1038                 scan = scan->next;
1039         }
1040
1041         if(!scan)
1042         {
1043                 Quit(gvar, "MM_FreePtr: Block not found!\n");
1044                 //printf("MM_FreePtr: Block not found!\n"); return;
1045         }
1046
1047         last->next = scan->next;
1048
1049         FREEBLOCK(scan);
1050 }
1051 //==========================================================================
1052
1053 /*
1054 =====================
1055 =
1056 = MM_SetPurge
1057 =
1058 = Sets the purge level for a block (locked blocks cannot be made purgable)
1059 =
1060 =====================
1061 */
1062
1063
1064 void MM_SetPurge(memptr *baseptr, int purge, global_game_variables_t *gvar)
1065 {
1066         mmblocktype far *start;
1067
1068         start = gvar->mm.mmrover;
1069
1070         do
1071         {
1072                 if(gvar->mm.mmrover->useptr == baseptr)
1073                         break;
1074
1075                 gvar->mm.mmrover = gvar->mm.mmrover->next;
1076
1077                 if(!gvar->mm.mmrover)
1078                         gvar->mm.mmrover = gvar->mm.mmhead;
1079                 else if(gvar->mm.mmrover == start)
1080                 {
1081                         Quit (gvar, "MM_SetPurge: Block not found!");
1082                         //return;
1083                 }
1084
1085         } while(1);
1086
1087         gvar->mm.mmrover->attributes &= ~PURGEBITS;
1088         gvar->mm.mmrover->attributes |= purge;
1089 }
1090
1091 //==========================================================================
1092
1093 /*
1094 =====================
1095 =
1096 = MM_SetLock
1097 =
1098 = Locks / unlocks the block
1099 =
1100 =====================
1101 */
1102
1103 void MM_SetLock(memptr *baseptr, boolean locked, global_game_variables_t *gvar)
1104 {
1105         mmblocktype far *start;
1106
1107         start = gvar->mm.mmrover;
1108
1109         do
1110         {
1111                 if(gvar->mm.mmrover->useptr == baseptr)
1112                         break;
1113
1114                 gvar->mm.mmrover = gvar->mm.mmrover->next;
1115
1116                 if(!gvar->mm.mmrover)
1117                         gvar->mm.mmrover = gvar->mm.mmhead;
1118                 else if(gvar->mm.mmrover == start)
1119                 {
1120                         Quit (gvar, "MM_SetLock: Block not found!");
1121                         //return;
1122                 }
1123
1124         } while(1);
1125
1126         gvar->mm.mmrover->attributes &= ~LOCKBIT;
1127         gvar->mm.mmrover->attributes |= locked*LOCKBIT;
1128 }
1129
1130 //==========================================================================
1131
1132 /*
1133 =====================
1134 =
1135 = MM_SortMem
1136 =
1137 = Throws out all purgable stuff and compresses movable blocks
1138 =
1139 =====================
1140 */
1141
1142 void MM_SortMem(global_game_variables_t *gvar)
1143 {
1144         mmblocktype far *scan,far *last,far *next;
1145         unsigned        start,length,source,dest;//++++,oldborder;
1146         //++++int                       playing;
1147
1148         //
1149         // lock down a currently playing sound
1150         //
1151 /*++++  playing = SD_SoundPlaying ();
1152         if(playing)
1153         {
1154                 switch (SoundMode)
1155                 {
1156                 case sdm_PC:
1157                         playing += STARTPCSOUNDS;
1158                         break;
1159                 case sdm_AdLib:
1160                         playing += STARTADLIBSOUNDS;
1161                         break;
1162                 }
1163                 MM_SetLock(&(memptr)audiosegs[playing],true);
1164         }
1165
1166
1167         SD_StopSound();*/
1168 //      oldborder = bordercolor;
1169 //      VW_ColorBorder (15);
1170
1171         if(beforesort)
1172                 beforesort();
1173
1174         scan = gvar->mm.mmhead;
1175
1176         last = NULL;            // shut up compiler warning
1177
1178         while(scan)
1179         {
1180                 if(scan->attributes & LOCKBIT)
1181                 {
1182                 //
1183                 // block is locked, so try to pile later blocks right after it
1184                 //
1185                         start = scan->start + scan->length;
1186                 }
1187                 else
1188                 {
1189                         if(scan->attributes & PURGEBITS)
1190                         {
1191                         //
1192                         // throw out the purgable block
1193                         //
1194                                 next = scan->next;
1195                                 FREEBLOCK(scan);
1196                                 //MM_FreeBlock(scan, gvar);
1197                                 last->next = next;
1198                                 scan = next;
1199                                 continue;
1200                         }
1201                         else
1202                         {
1203                         //
1204                         // push the non purgable block on top of the last moved block
1205                         //
1206                                 if(scan->start != start)
1207                                 {
1208                                         length = scan->length;
1209                                         source = scan->start;
1210                                         dest = start;
1211                                         while(length > 0xf00)
1212                                         {
1213                                                 movedata(source,0,dest,0,0xf00*16);
1214                                                 length -= 0xf00;
1215                                                 source += 0xf00;
1216                                                 dest += 0xf00;
1217                                         }
1218                                         movedata(source,0,dest,0,length*16);
1219
1220                                         scan->start = start;
1221                                         *(unsigned *)scan->useptr = start;
1222                                 }
1223                                 start = scan->start + scan->length;
1224                         }
1225                 }
1226
1227                 last = scan;
1228                 scan = scan->next;              // go to next block
1229         }
1230
1231         gvar->mm.mmrover = gvar->mm.mmhead;
1232
1233         if(aftersort)
1234                 aftersort();
1235
1236 //      VW_ColorBorder (oldborder);
1237
1238 /*++++  if(playing)
1239                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
1240 }
1241
1242 //==========================================================================
1243
1244 /*
1245 =====================
1246 =
1247 = MM_ShowMemory
1248 =
1249 =====================
1250 */
1251
1252 void MM_ShowMemory(global_game_variables_t *gvar)
1253 {
1254         mmblocktype far *scan;
1255         //word temp;
1256         sdword  end,owner;
1257         //word chx,chy;
1258         word w;
1259         //dword wwww;
1260         byte    scratch[160],scratch0[4096],str[16];//[[[[scratch1[160],
1261         //byte d = '#';
1262 //[[[[  VW_SetDefaultColors();
1263 //[[[[  VW_SetLineWidth(40);
1264 //++++mh        temp = bufferofs;
1265 //++++mh        bufferofs = 0;
1266 //[[[[  VW_SetScreen (0,0);
1267         scan = gvar->mm.mmhead;
1268         end = -1;
1269
1270         CA_OpenDebug (gvar);
1271         w=0;
1272         while(scan)
1273         {
1274                 strcpy(scratch, AARESET);
1275                 if(scan->attributes & PURGEBITS)
1276                         strcpy(scratch0, AAMAGENTA);            // dark purple = purgable
1277                 else
1278                         strcpy(scratch0, AABLUE);               // medium blue = non purgable
1279                 if(scan->attributes & LOCKBIT)
1280                         strcpy(scratch0, AARED);                // red = locked
1281                 if(scan->start<=end)
1282                 {
1283                         printf("\nend==%d\n\n", end);
1284                         strcat(scratch, "MM_ShowMemory: Memory block order currupted!\n");
1285                         strcat(scratch, "End's Size: ");
1286                         ultoa (end,str,10);
1287                         strcat (scratch,str);
1288                         strcat(scratch, "\nscan->start's Size: ");
1289                         ultoa (scan->start,str,10);
1290                         strcat (scratch,str);
1291                         write(gvar->handle.debughandle,scratch,strlen(scratch));
1292                         //modexprint(&page, chx, chy, 1, 0, 24, "\nMM_ShowMemory: Memory block order currupted!\n");
1293                         break;
1294                 }
1295                 end = scan->start+(scan->length)-1;
1296 //++++          chy = scan->start/320;
1297 //++++          chx = scan->start%320;
1298                                 //modexhlin(page, scan->start, (unsigned)end, chy, color);
1299                                 //for(chx=scan->start;chx+4>=(word)end;chx+=4)
1300                                 //{
1301 //++++                                  modexClearRegion(page, chx, chy, 4, 4, color);
1302                                 //}
1303 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1304                 for(w=(scan->start)/80;w<=end/80;w++)
1305                 {
1306                         //printf("+     %u      %lu\n", w, scan->length);
1307                         strcat(scratch0, "+");
1308                 }
1309                 //++==++==optional strcat(scratch0, AARESET); strcat(scratch0, AAGREY); strcat(scratch0,"_");
1310 //++++          VW_Plot(scan->start,0,15);
1311 //++++                          modexClearRegion(page, chx, chy, 4, 4, 15);
1312 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1313
1314                 //wwww=(dword)(scan->next->start)-(dword)scan->start;
1315                 //wwww=(dword)scan->start+(dword)(scan->next->start);
1316                 if (scan->next && scan->next->start >= end+1)
1317                 {
1318                         strcat(scratch0, AARESET);
1319                         //++==++==optional strcat(scratch0, "\n");
1320                         strcat(scratch0,AAGREEN);
1321                         for(w=(end+1)/80;w<=((scan->next->start-scan->start)/80);w++)
1322                         //for(w=(wwww)/80;w<=((end+1)/80);w++)
1323                         //for(w=(end+1)/80;w<=((wwww)/80);w++)
1324                         {
1325                                 //printf("0     %x      %u      %lu\n", scan->next->start, w, scan->length);
1326                                 strcat(scratch0,"0");
1327                         }
1328                         //printf("==================\n");
1329                         //printf("w=%u  wwww=%lu        start=%04x      next=%04x       end=%lu\n", w/80, wwww/80, scan->start, (scan->next->start), end+1);
1330                         //printf("==================\n");
1331                         strcat(scratch0, "\n");
1332                         //getch();
1333                 }/*else {//if(scan->next->start <= scan->start){
1334                         scan->next->start=scan->start+0x1000;
1335                         wwww=(dword)(scan->next->start)-(dword)scan->start;
1336                         strcat(scratch0, AARESET);
1337                         strcat(scratch0, "\n");
1338                         strcat(scratch0,AAGREEN);
1339                         for(w=(end+1);w<=(0x1000/80);w++)
1340                         {
1341                                 //printf("0     %x      %x      %u\n", scan->start, w);
1342                                 strcat(scratch0,"0");
1343                         }
1344                         printf("================\n");
1345                         printf("w=%x    start=%x        next=%x end=%u  %lu\n", w, scan->start, (scan->next->start), end+1, wwww);
1346                         printf("================\n");
1347                         getch();
1348                 }*/
1349                 strcat(scratch0, AARESET);
1350                 //strcat(scratch0,"\n");
1351                         //for(chx=scan->next->start;chx+4>=(word)end+1;chx+=4)
1352                         //{
1353 //                              chx+=scan->next->start;
1354 //                              modexClearRegion(page, chx, chy, 4, 4, 2);
1355                         //}
1356                                         //modexhlin(page, end+1,scan->next->start, chy, 0);
1357 /*              y = scan->start/320;
1358                 x = scan->start%320;
1359                 VW_Hlin(x,x+end,y,color);
1360                 VW_Plot(x,y,15);*/
1361 //++++                  VW_Hlin(x+end+1,x+(scan->next->start-scan->start),y,0); // black = free
1362                 strcat(scratch,"Seg:");
1363                 ultoa (scan->start,str,16);
1364                 strcat (scratch,str);
1365                 strcat (scratch,"\tSize:");
1366                 ultoa ((unsigned)scan->length,str,10);
1367                 strcat (scratch,str);
1368                 strcat (scratch,"\tOwner:0x");
1369                 owner = (unsigned)scan->useptr;
1370                 ultoa (owner,str,16);
1371                 strcat (scratch,str);
1372                 strcat (scratch,"\n");
1373                 write(gvar->handle.debughandle,scratch,strlen(scratch));
1374                 write(gvar->handle.debughandle,scratch0,strlen(scratch0));
1375 //modexprint(page, chx, chy, 1, 0, 24, &scratch);
1376 //++++chy+=4;
1377 //fprintf(stdout, "%s", scratch);
1378
1379                 scan = scan->next;
1380         }
1381         /*strcpy(scratch1, AARESET);
1382         strcat(scratch1, "========================================\n");
1383         strcat(scratch1, "near=  ");
1384         ultoa (*(gvar->mm.nearheap),str,10);
1385         strcat (scratch1,str);
1386         strcat(scratch1, "      far= ");
1387         ultoa (*(gvar->mm.farheap),str,10);
1388         strcat (scratch1,str);
1389         strcat(scratch1, "\n");
1390         //strcat(scratch1, "&near=      %Fp ", &(gvar->mm.nearheap));
1391         //strcat(scratch1, "&far=       %Fp", &(gvar->mm.farheap));
1392         //strcat(scratch1, "\n");
1393         strcat(scratch1, "========================================\n");
1394         write(gvar->handle.debughandle,scratch1,strlen(scratch1));*/
1395
1396
1397         CA_CloseDebug (gvar);
1398
1399 //++++mh        IN_Ack();
1400 //****  VW_SetLineWidth(64);
1401 //++++mh        bufferofs = temp;
1402 }
1403
1404 //==========================================================================
1405
1406 /*
1407 =====================
1408 =
1409 = MM_DumpData
1410 =
1411 =====================
1412 */
1413
1414 void MM_DumpData(global_game_variables_t *gvar)
1415 {
1416         mmblocktype far *scan,far *best;
1417         long    lowest,oldlowest;
1418         word    owner;
1419         byte    lock,purge;
1420         FILE    *dumpfile;
1421
1422 #ifdef __WATCOMC__
1423         _nfree(gvar->mm.nearheap);
1424 #endif
1425 #ifdef __BORLANDC__
1426         free(gvar->mm.nearheap);
1427 #endif
1428 #ifdef __BORLANDC__
1429                 dumpfile = fopen ("mmdump.16b","w");
1430 #endif
1431 #ifdef __WATCOMC__
1432                 dumpfile = fopen ("mmdump.16w","w");
1433 #endif
1434         if (!dumpfile){
1435                 printf("MM_DumpData: Couldn't open MMDUMP.16!\n");
1436                 return;
1437         }
1438
1439         lowest = -1;
1440         do
1441         {
1442                 oldlowest = lowest;
1443                 lowest = 0xffff;
1444
1445                 scan = gvar->mm.mmhead;
1446                 while (scan)
1447                 {
1448                         owner = (unsigned)scan->useptr;
1449
1450                         if (owner && owner<lowest && owner > oldlowest)
1451                         {
1452                                 best = scan;
1453                                 lowest = owner;
1454                         }
1455
1456                         scan = scan->next;
1457                 }
1458
1459                 if (lowest != 0xffff)
1460                 {
1461                         if (best->attributes & PURGEBITS)
1462                                 purge = 'P';
1463                         else
1464                                 purge = '-';
1465                         if (best->attributes & LOCKBIT)
1466                                 lock = 'L';
1467                         else
1468                                 lock = '-';
1469                         fprintf (dumpfile,"0x%p (%c%c) = %u\n"
1470                         ,(unsigned)lowest,lock,purge,best->length);
1471                 }
1472
1473         } while (lowest != 0xffff);
1474
1475         fclose(dumpfile);
1476         printf("MMDUMP.16 created.\n");
1477 }
1478
1479 //==========================================================================
1480
1481
1482 /*
1483 ======================
1484 =
1485 = MM_UnusedMemory
1486 =
1487 = Returns the total free space without purging
1488 =
1489 ======================
1490 */
1491
1492 dword MM_UnusedMemory(global_game_variables_t *gvar)
1493 {
1494         dword free;
1495         mmblocktype far *scan;
1496
1497         free = 0;
1498         scan = gvar->mm.mmhead;
1499
1500         while(scan->next)
1501         {
1502                 free += scan->next->start - (scan->start + scan->length);
1503                 scan = scan->next;
1504         }
1505
1506         return free*16lu;
1507 //      return free;
1508 }
1509
1510 //==========================================================================
1511
1512
1513 /*
1514 ======================
1515 =
1516 = MM_TotalFree
1517 =
1518 = Returns the total free space with purging
1519 =
1520 ======================
1521 */
1522
1523 dword MM_TotalFree(global_game_variables_t *gvar)
1524 {
1525         dword free;
1526         mmblocktype far *scan;
1527
1528         free = 0;
1529         scan = gvar->mm.mmhead;
1530
1531         while(scan->next)
1532         {
1533                 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1534                         free += scan->length;
1535                 free += scan->next->start - (scan->start + scan->length);
1536                 scan = scan->next;
1537         }
1538
1539         return free*16lu;
1540 //      return free;
1541 }
1542
1543 //==========================================================================
1544
1545 /*
1546 =====================
1547 =
1548 = MM_Report
1549 =
1550 =====================
1551 */
1552
1553 void MM_Report_(global_game_variables_t *gvar)
1554 {
1555         printf("========================================\n");
1556         printf("                MM_Report_\n");
1557         printf("========================================\n");
1558         if(MML_CheckForEMS())
1559         {
1560                 printf("        %cLIMEMS        %u\n", 0xC9, gvar->pm.emm.EMSPresent);
1561                 printf("        %c%cEMM v%x.%x available\n", 0xC7, 0xC4, gvar->pm.emm.EMSVer>>4,gvar->pm.emm.EMSVer&0x0F);
1562                 printf("        %c%ctotalEMSpages:      %u      ", 0xC7, 0xC4, gvar->pm.emm.totalEMSpages); printf("freeEMSpages:       %u\n", gvar->pm.emm.freeEMSpages);
1563                 printf("        %c%cEMSPageFrame:       %04x\n", 0xC7, 0xC4, gvar->pm.emm.EMSPageFrame);
1564                 printf("        %c%cEMSmem:     %lu\n", 0xD3, 0xC4, gvar->mmi.EMSmem);
1565         }
1566         if(MML_CheckForXMS())
1567         {
1568                 printf("        %cXMS   %u\n", 0xC9, gvar->pm.xmm.XMSPresent);
1569                 printf("        %c%cXMS v%x.%x available\n", 0xC7, 0xC4, XMSVer>>8,XMSVer&0x0F);
1570                 printf("        %c%cXMSDriver:  %Fp\n", 0xC7, 0xC4, XMSDriver);
1571                 printf("        %c%cXMSHandle:  %04x\n", 0xC7, 0xC4, gvar->pm.xmm.XMSHandle);
1572                 printf("        %c%cXMSmem:     %lu\n", 0xD3, 0xC4, gvar->mmi.XMSmem);
1573         }
1574         printf("        %cConv. %u\n", 0xC9, gvar->pm.mm.MainPresent); DebugMemory_(gvar, 0);
1575         //printf("mainmem:      %lu\n", gvar->mmi.mainmem);
1576         //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);
1577         //printf("                      UnusedMemory:   %lu\n", MM_UnusedMemory(gvar));
1578         printf("nearheap:       %lu             ", gvar->mmi.nearheap); printf("farheap:        %lu\n", gvar->mmi.farheap);
1579 }
1580
1581 //==========================================================================
1582
1583 /*
1584 =====================
1585 =
1586 = MM_EMSerr
1587 =
1588 =====================
1589 */
1590
1591 void MM_EMSerr(byte *stri, byte err)
1592 {
1593         //Returns a text string describing the error code in EMS.Error.
1594         switch(err)
1595         {
1596                 case 0x0:
1597                         strcat(stri, "successful");
1598                 break;
1599                 case 0x80:
1600                         strcat(stri, "internal error");
1601                 break;
1602                 case 0x81:
1603                         strcat(stri, "hardware malfunction");
1604                 break;
1605                 case 0x82:
1606                         strcat(stri, "busy .. retry later");
1607                 break;
1608                 case 0x83:
1609                         strcat(stri, "invalid handle");
1610                 break;
1611                 case 0x84:
1612                         strcat(stri, "undefined function requested by application");
1613                 break;
1614                 case 0x85:
1615                         strcat(stri, "no more handles available");
1616                 break;
1617                 case 0x86:
1618                         strcat(stri, "error in save or restore of mapping context");
1619                 break;
1620                 case 0x87:
1621                         strcat(stri, "insufficient memory pages in system");
1622                 break;
1623                 case 0x88:
1624                         strcat(stri, "insufficient memory pages available");
1625                 break;
1626                 case 0x89:
1627                         strcat(stri, "zero pages requested");
1628                 break;
1629                 case 0x8A:
1630                         strcat(stri, "invalid logical page number encountered");
1631                 break;
1632                 case 0x8B:
1633                         strcat(stri, "invalid physical page number encountered");
1634                 break;
1635                 case 0x8C:
1636                         strcat(stri, "page-mapping hardware state save area is full");
1637                 break;
1638                 case 0x8D:
1639                         strcat(stri, "save of mapping context failed");
1640                 break;
1641                 case 0x8E:
1642                         strcat(stri, "restore of mapping context failed");
1643                 break;
1644                 case 0x8F:
1645                         strcat(stri, "undefined subfunction");
1646                 break;
1647                 case 0x90:
1648                         strcat(stri, "undefined attribute type");
1649                 break;
1650                 case 0x91:
1651                         strcat(stri, "feature not supported");
1652                 break;
1653                 case 0x92:
1654                         strcat(stri, "successful, but a portion of the source region has been overwritten");
1655                 break;
1656                 case 0x93:
1657                         strcat(stri, "length of source or destination region exceeds length of region allocated to either source or destination handle");
1658                 break;
1659                 case 0x94:
1660                         strcat(stri, "conventional and expanded memory regions overlap");
1661                 break;
1662                 case 0x95:
1663                         strcat(stri, "offset within logical page exceeds size of logical page");
1664                 break;
1665                 case 0x96:
1666                         strcat(stri, "region length exceeds 1 MB");
1667                 break;
1668                 case 0x97:
1669                         strcat(stri, "source and destination EMS regions have same handle and overlap");
1670                 break;
1671                 case 0x98:
1672                         strcat(stri, "memory source or destination type undefined");
1673                 break;
1674                 case 0x9A:
1675                         strcat(stri, "specified alternate map register or DMA register set not supported");
1676                 break;
1677                 case 0x9B:
1678                         strcat(stri, "all alternate map register or DMA register sets currently allocated");
1679                 break;
1680                 case 0x9C:
1681                         strcat(stri, "alternate map register or DMA register sets not supported");
1682                 break;
1683                 case 0x9D:
1684                         strcat(stri, "undefined or unallocated alternate map register or DMA register set");
1685                 break;
1686                 case 0x9E:
1687                         strcat(stri, "dedicated DMA channels not supported");
1688                 break;
1689                 case 0x9F:
1690                         strcat(stri, "specified dedicated DMA channel not supported");
1691                 break;
1692                 case 0xA0:
1693                         strcat(stri, "no such handle name");
1694                 break;
1695                 case 0xA1:
1696                         strcat(stri, "a handle found had no name, or duplicate handle name");
1697                 break;
1698                 case 0xA2:
1699                         strcat(stri, "attempted to wrap around 1M conventional address space");
1700                 break;
1701                 case 0xA3:
1702                         strcat(stri, "source array corrupted");
1703                 break;
1704                 case 0xA4:
1705                         strcat(stri, "operating system denied access");
1706                 break;
1707                 default:
1708                         strcat(stri, "undefined error");
1709         }
1710 }
1711
1712 //==========================================================================
1713
1714 /*
1715 =====================
1716 =
1717 = MM_BombOnError
1718 =
1719 =====================
1720 */
1721
1722 void MM_BombOnError(boolean bomb, global_game_variables_t *gvar)
1723 {
1724         gvar->mm.bombonerror = bomb;
1725 }
1726
1727 /*void MM_GetNewBlock(global_game_variables_t *gvar)
1728 {
1729         if(!gvar->mm.mmfree)
1730                 MML_ClearBlock(gvar);
1731         gvar->mm.mmnew=gvar->mm.mmfree;
1732         gvar->mm.mmfree=gvar->mm.mmfree->next;
1733         if(!(gvar->mm.mmnew=gvar->mm.mmfree))
1734         {
1735                 printf("MM_GETNEWBLOCK: No free blocks!\n");
1736                 return;
1737         }
1738         gvar->mm.mmfree=gvar->mm.mmfree->next;
1739 }
1740
1741 void MM_FreeBlock(mmblocktype *x, global_game_variables_t *gvar)
1742 {
1743         x->useptr=NULL;
1744         x->next=gvar->mm.mmfree;
1745         gvar->mm.mmfree=x;
1746 }*/
1747
1748 void xms_call(byte v, global_game_variables_t *gvar)
1749 {
1750         dword XMSDriver = gvar->pm.xmm.XMSDriver;
1751         __asm {
1752                 mov     ah,[v]
1753                 call [DWORD PTR XMSDriver]
1754         }
1755 }
1756
1757 /*void MM_seguin(void)
1758 {
1759         __asm {
1760                 push    ds
1761                 mov     ax,ds
1762                 inc             ax
1763                 mov     ds,ax
1764         }
1765 }
1766
1767 void MM_segude(void)
1768 {
1769         __asm {
1770                 pop ds
1771         }
1772 }*/
1773
1774 /*
1775 pull data from far and put it into ds var
1776 mov ax,es:si
1777 mov x,ax
1778 */
1779 /*
1780 ss stack segment
1781 sp top of stack
1782 bp bottem of stack
1783 */