src/lib/16_mm.c

   1 /* Catacomb Apocalypse Source Code
   2  * Copyright (C) 1993-2014 Flat Rock Software
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 // NEWMM.C
  20
  21 /*
  22 =============================================================================
  23
  24                         ID software memory manager
  25                         --------------------------
  26
  27 Primary coder: John Carmack
  28
  29 RELIES ON
  30 ---------
  31 Quit (char *error) function
  32
  33
  34 WORK TO DO
  35 ----------
  36 MM_SizePtr to change the size of a given pointer
  37
  38 Multiple purge levels utilized
  39
  40 EMS / XMS unmanaged routines
  41
  42 =============================================================================
  43 */
  44 /*
  45
  46 Open Watcom port by sparky4
  47
  48 */
  49 #include "src/lib/16_mm.h"
  50
  51 /*
  52 =============================================================================
  53
  54                                                  GLOBAL VARIABLES
  55
  56 =============================================================================
  57 */
  58
  59 void            (* beforesort) (void);
  60 void            (* aftersort) (void);
  61 void            (* XMSaddr) (void);             // far pointer to XMS driver
  62
  63 /*
  64 =============================================================================
  65
  66                                                  LOCAL VARIABLES
  67
  68 =============================================================================
  69 */
  70
  71 static  char *ParmStringsexmm[] = {"noems","noxms",""};
  72
  73 /*
  74 ======================
  75 =
  76 = MML_CheckForEMS
  77 =
  78 = Routine from p36 of Extending DOS
  79 =
  80 =======================
  81 */
  82
  83 boolean MML_CheckForEMS(void)
  84 {
  85         boolean emmcfems;
  86         static char     emmname[] = "EMMXXXX0"; //fix by andrius4669
  87 //              mov     dx,OFFSET emmname
  88         __asm {
  89                 //LEA   DX, emmname     //fix by andrius4669
  90                 mov     dx,OFFSET emmname       //fix by andrius4669
  91                 mov     ax,0x3d00
  92                 int     0x21            // try to open EMMXXXX0 device
  93                 jc      error
  94
  95                 mov     bx,ax
  96                 mov     ax,0x4400
  97
  98                 int     0x21            // get device info
  99                 jc      error
 100
 101                 and     dx,0x80
 102                 jz      error
 103
 104                 mov     ax,0x4407
 105
 106                 int     0x21            // get status
 107                 jc      error
 108                 or      al,al
 109                 jz      error
 110
 111                 mov     ah,0x3e
 112                 int     0x21            // close handle
 113                 jc      error
 114                 //
 115                 // EMS is good
 116                 //
 117                 mov     emmcfems,1
 118                 jmp End
 119                 error:
 120                 //
 121                 // EMS is bad
 122                 //
 123                 mov     emmcfems,0
 124                 End:
 125         }
 126         return(emmcfems);
 127 }
 128
 129
 130 /*
 131 ======================
 132 =
 133 = MML_SetupEMS
 134 =
 135 =======================
 136 */
 137
 138 unsigned MML_SetupEMS(mminfo_t *mm)
 139 {
 140         char    str[80],str2[10];
 141         unsigned        err;
 142         boolean errorflag=false;
 143         union REGS CPURegs;
 144
 145         unsigned int EMSVer = 0;
 146         unsigned        totalEMSpages,freeEMSpages,EMSpageframe,EMSpagesmapped,EMShandle;
 147         totalEMSpages = freeEMSpages = EMSpageframe = EMSpagesmapped = 0;
 148
 149         __asm
 150                 {
 151                 mov     ah,EMS_STATUS
 152                 int     EMS_INT                                         // make sure EMS hardware is present
 153                 or      ah,ah
 154                 jnz     error
 155
 156                 mov     ah,EMS_VERSION
 157                 int     EMS_INT
 158                 or      ah,ah
 159                 jnz     error
 160                 mov     [EMSVer],ax                             //      set EMSVer
 161                 cmp     al,0x32                                         // only work on ems 3.2 or greater
 162                 jb      error
 163
 164                 mov     ah,EMS_GETFRAME
 165                 int     EMS_INT                                         // find the page frame address
 166                 or      ah,ah
 167                 jnz     error
 168                 mov     [EMSpageframe],bx
 169
 170                 mov     ah,EMS_GETPAGES
 171                 int     EMS_INT                                         // find out how much EMS is there
 172                 or      ah,ah
 173                 jnz     error
 174                 mov     [totalEMSpages],dx
 175                 mov     [freeEMSpages],bx
 176                 or      bx,bx
 177                 jz      noEMS                                           // no EMS at all to allocate
 178                                                                                         //EXPAND DONG!!!!
 179                 cmp     [EMSVer],0x40
 180                 jb      low
 181                 cmp     bx,[freeEMSpages]
 182                 jle     getpages
 183                 mov     bx,[freeEMSpages]
 184                 jmp     getpages
 185
 186 low:
 187                 cmp     bx,4
 188                 jle     getpages                                        // there is only 1,2,3,or 4 pages
 189                 mov     bx,4                                            // we can't use more than 4 pages
 190
 191 getpages:
 192                 mov     [EMSpagesmapped],bx
 193                 mov     ah,EMS_ALLOCPAGES                       // allocate up to 64k of EMS
 194                 int     EMS_INT
 195                 or      ah,ah
 196                 jnz     error
 197                 mov     [EMShandle],dx
 198                 jmp End
 199 error:
 200                 mov     errorflag,1
 201                 jmp End
 202 noEMS:
 203 End:
 204         }
 205         if(errorflag==true)
 206         {
 207                 err = CPURegs.h.ah;
 208                 strcpy(str,"MML_SetupEMS: EMS error 0x");
 209                 itoa(err,str2,16);
 210                 strcpy(str,str2);
 211                 printf("%s\n",str);
 212                 return err;
 213         }
 214         mm->totalEMSpages=totalEMSpages;
 215         mm->freeEMSpages=freeEMSpages;
 216         mm->EMSpageframe=EMSpageframe;
 217         mm->EMSpagesmapped=EMSpagesmapped;
 218         mm->EMShandle=EMShandle;
 219         mm->EMSVer=EMSVer;
 220         return 0;
 221 }
 222
 223
 224 /*
 225 ======================
 226 =
 227 = MML_ShutdownEMS
 228 =
 229 =======================
 230 */
 231
 232 void MML_ShutdownEMS(mminfo_t *mm)
 233 {
 234         boolean errorflag=false;
 235         unsigned EMShandle=mm->EMShandle;
 236
 237         if(!EMShandle)
 238                 return;
 239         __asm
 240         {
 241                 mov     ah,EMS_FREEPAGES
 242                 mov     dx,[EMShandle]
 243                 int     EMS_INT
 244                 or      ah,ah
 245                 jz      ok
 246                 mov     errorflag,1
 247                 ok:
 248         }
 249         if(errorflag==true) printf("MML_ShutdownEMS: Error freeing EMS!");      //++++ add something
 250 }
 251
 252 /*
 253 ====================
 254 =
 255 = MM_MapEMS
 256 =
 257 = Maps the 64k of EMS used by memory manager into the page frame
 258 = for general use.  This only needs to be called if you are keeping
 259 = other things in EMS.
 260 =
 261 ====================
 262 */
 263
 264 unsigned MM_MapEMS(mminfo_t *mm)
 265 {
 266         char    str[80],str2[10];
 267         unsigned        err, EMShandle;
 268         boolean errorflag=false;
 269         int     i;
 270         union REGS CPURegs;
 271         EMShandle=mm->EMShandle;
 272
 273         for (i=0;i<mm->EMSpagesmapped;i++)
 274         {
 275                 __asm
 276                 {
 277                         mov     ah,EMS_MAPPAGE
 278                         mov     bx,[i]                  // logical page
 279                         mov     al,bl                   // physical page
 280                         mov     dx,[EMShandle]  // handle
 281                         int     EMS_INT
 282                         or      ah,ah
 283                         jnz     error
 284                         jmp End
 285                         error:
 286                         mov     errorflag,1
 287                         End:
 288                 }
 289                 if(errorflag==true)
 290                 {
 291                         err = CPURegs.h.ah;
 292                         strcpy(str,"MM_MapEMS: EMS error 0x");
 293                         itoa(err,str2,16);
 294                         strcpy(str,str2);
 295                         printf("%s\n",str);
 296                         return err;
 297                 }
 298         }
 299         return 0;
 300 }
 301
 302 //==========================================================================
 303
 304 /*
 305 ======================
 306 =
 307 = MML_CheckForXMS
 308 =
 309 = Check for XMM driver
 310 =
 311 =======================
 312 */
 313
 314 boolean MML_CheckForXMS(mminfo_t *mm)
 315 {
 316         boolean errorflag=false;
 317         mm->numUMBs = 0;
 318
 319         __asm
 320         {
 321                 mov     ax,0x4300
 322                 int     0x2f                            // query status of installed diver
 323                 cmp     al,0x80
 324                 je      good
 325                 mov     errorflag,1
 326                 good:
 327         }
 328         if(errorflag==true) return false;
 329         else return true;
 330 }
 331
 332
 333 /*
 334 ======================
 335 =
 336 = MML_SetupXMS
 337 =
 338 = Try to allocate all upper memory block
 339 =
 340 =======================
 341 */
 342
 343 void MML_SetupXMS(mminfo_t *mm, mminfotype *mmi)
 344 {
 345         unsigned        base,size;
 346
 347 getmemory:
 348         __asm
 349         {
 350                 mov     ax,0x4310
 351                 int     0x2f
 352                 mov     [WORD PTR XMSaddr],bx
 353                 mov     [WORD PTR XMSaddr+2],es         // function pointer to XMS driver
 354
 355                 mov     ah,XMS_ALLOCUMB
 356                 mov     dx,0xffff                                       // try for largest block possible
 357                 //mov     ax,dx                                         // Set available Kbytes.
 358                 call    [DWORD PTR XMSaddr]
 359                 or      ax,ax
 360                 jnz     gotone
 361
 362                 cmp     bl,0xb0                                         // error: smaller UMB is available
 363                 jne     done;
 364
 365                 mov     ah,XMS_ALLOCUMB
 366                 call    [DWORD PTR XMSaddr]             // DX holds largest available UMB
 367                 or      ax,ax
 368                 jz      done                                            // another error...
 369
 370 gotone:
 371                 mov     [base],bx
 372                 mov     [size],dx
 373 done:
 374         }
 375         printf("base=%u ", base); printf("size=%u\n", size);
 376         MML_UseSpace(base,size, mm);
 377         mmi->XMSmem += size*16;
 378         mm->UMBbase[mm->numUMBs] = base;
 379         mm->numUMBs++;
 380         if(mm->numUMBs < MAXUMBS)
 381                 goto getmemory;
 382 }
 383
 384
 385 /*
 386 ======================
 387 =
 388 = MML_ShutdownXMS
 389 =
 390 ======================
 391 */
 392
 393 void MML_ShutdownXMS(mminfo_t *mm)
 394 {
 395         int     i;
 396         unsigned        base;
 397
 398         for (i=0;i<mm->numUMBs;i++)
 399         {
 400                 base = mm->UMBbase[i];
 401                 __asm
 402                 {
 403                         mov     ah,XMS_FREEUMB
 404                         mov     dx,[base]
 405                         call    [DWORD PTR XMSaddr]
 406                 }
 407         }
 408 }
 409
 410 //==========================================================================
 411
 412 /*
 413 ======================
 414 =
 415 = MML_UseSpace
 416 =
 417 = Marks a range of paragraphs as usable by the memory manager
 418 = This is used to mark space for the near heap, far heap, ems page frame,
 419 = and upper memory blocks
 420 =
 421 ======================
 422 */
 423
 424 void MML_UseSpace(/*d*/word segstart, dword seglength, mminfo_t *mm)
 425 {
 426         mmblocktype huge *scan,huge *last;
 427         word            segm;
 428         dword   oldend;
 429         dword           extra;
 430
 431         scan = last = mm->mmhead;
 432         mm->mmrover = mm->mmhead;               // reset rover to start of memory
 433
 434 //
 435 // search for the block that contains the range of segments
 436 //
 437         while(scan->start+scan->length < segstart)
 438         {
 439                 last = scan;
 440                 scan = scan->next;
 441         }
 442
 443         //find out how many blocks it spans!
 444         if(seglength>0xffffu)
 445         {
 446                 segm=seglength/0x4000u;
 447 //              segm=seglength/0xffffu;
 448         }
 449         else segm=1;
 450
 451 //
 452 // take the given range out of the block
 453 //
 454         oldend = scan->start + scan->length;
 455         extra = oldend - (segstart+seglength);
 456         //++++emsver stuff!
 457         if(extra>0xfffflu)
 458         {
 459                 /*__asm
 460                 {
 461                         push    ds
 462                         mov     ax,ds
 463                         inc             ax
 464                         mov     ds,ax
 465                 }*/
 466 printf("segm=%u ", segm);
 467 printf("ex=%lu  ", extra);
 468 printf("len=%u  ", scan->length);
 469 printf("segsta=%x       ", segstart);
 470 printf("seglen=%lu\n", seglength);
 471
 472 //MML_UseSpace(?segstart?, ?length?, mm);
 473
 474                 /*__asm
 475                 {
 476                         pop ds
 477                 }*/
 478                 //printf("MML_UseSpace: Segment spans two blocks!\n");
 479         }
 480
 481 //segu:
 482 //++++todo: linked list of segment!
 483 //printf("segm=%lu\n", segm);
 484         if(segstart == scan->start)
 485         {
 486                 last->next = scan->next;                        // unlink block
 487                 MM_FreeBlock(scan, mm);
 488                 scan = last;
 489         }
 490         else
 491                 scan->length = segstart-scan->start;    // shorten block
 492
 493 //      segm--;
 494
 495         if(extra > 0)
 496         {
 497                 MM_GetNewBlock(mm);
 498                 mm->mmnew->next = scan->next;
 499                 scan->next = mm->mmnew;
 500                 mm->mmnew->start = segstart+seglength;
 501                 mm->mmnew->length = extra;
 502                 mm->mmnew->attributes = LOCKBIT;
 503         }//else if(segm>0) goto segu;
 504
 505 }
 506
 507 //==========================================================================
 508
 509 /*
 510 ====================
 511 =
 512 = MML_ClearBlock
 513 =
 514 = We are out of blocks, so free a purgable block
 515 =
 516 ====================
 517 */
 518
 519 void MML_ClearBlock(mminfo_t *mm)
 520 {
 521         mmblocktype huge *scan,huge *last;
 522
 523         scan = mm->mmhead->next;
 524
 525         while(scan)
 526         {
 527                 if(!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS))
 528                 {
 529                         MM_FreePtr(scan->useptr, mm);
 530                         return;
 531                 }
 532                 scan = scan->next;
 533         }
 534
 535         printf("MM_ClearBlock: No purgable blocks!\n");
 536 }
 537
 538
 539 //==========================================================================
 540
 541 /*
 542 ===================
 543 =
 544 = MM_Startup
 545 =
 546 = Grabs all space from turbo with malloc/farmalloc
 547 = Allocates bufferseg misc buffer
 548 =
 549 ===================
 550 */
 551
 552 void MM_Startup(mminfo_t *mm, mminfotype *mmi)
 553 {
 554         int i;
 555         dword length;
 556         void huge       *start;
 557         unsigned        segstart,seglength,endfree;
 558
 559         if(mm->mmstarted)
 560                 MM_Shutdown(mm);
 561
 562         mm->mmstarted = true;
 563         mm->bombonerror = true;
 564 //
 565 // set up the linked list (everything in the free list;
 566 //
 567         mm->mmhead = NULL;
 568         mm->mmfree = &(mm->mmblocks[0]);
 569         for(i=0;i<MAXBLOCKS-1;i++)
 570         {
 571                 mm->mmblocks[i].next = &(mm->mmblocks[i+1]);
 572         }
 573         mm->mmblocks[i].next = NULL;
 574
 575 //
 576 // locked block of all memory until we punch out free space
 577 //
 578         MM_GetNewBlock(mm);
 579         mm->mmhead = mm->mmnew;                         // this will allways be the first node
 580         mm->mmnew->start = 0;
 581         mm->mmnew->length = 0xffff;
 582         mm->mmnew->attributes = LOCKBIT;
 583         mm->mmnew->next = NULL;
 584         mm->mmrover = mm->mmhead;
 585
 586 //      farlen=_bios_memsize()*1024;
 587
 588 //
 589 // get all available near conventional memory segments
 590 //
 591 //----  length=coreleft();
 592         _nheapgrow();
 593         length=_memavl();
 594         start = (void huge *)(mm->nearheap = malloc(length));
 595         length -= 16-(FP_OFF(start)&15);
 596         length -= SAVENEARHEAP;
 597         seglength = length / 16;                        // now in paragraphs
 598         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 599         MML_UseSpace(segstart,seglength, mm);
 600         mmi->nearheap = length;
 601         //printf("near heap ok!\n");
 602
 603 //
 604 // get all available far conventional memory segments
 605 //
 606 //----  length=farcoreleft();
 607         _fheapgrow();
 608         length=_memavl();
 609         start = mm->farheap = halloc(length, sizeof(byte));
 610         //start = mm->farheap = _fmalloc(length);
 611         length -= 16-(FP_OFF(start)&15);
 612         length -= SAVEFARHEAP;
 613         seglength = length / 16;                        // now in paragraphs
 614         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 615         MML_UseSpace(segstart,seglength, mm);
 616         mmi->farheap = length;
 617         mmi->mainmem = mmi->nearheap + mmi->farheap;
 618         //printf("far heap ok!\n");
 619
 620
 621 //
 622 // detect EMS and allocate up to 64K at page frame
 623 //
 624         printf("EMS!\n\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0");       //bug!
 625         mmi->EMSmem = 0;
 626         for(i = 1;i < __argc;i++)
 627         {
 628                 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 629                         goto emsskip;                           // param NOEMS
 630         }
 631         printf("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0");     //bug!
 632         if(MML_CheckForEMS())
 633         {
 634 //printf("EMS1\n");
 635                 MML_SetupEMS(mm);                                       // allocate space
 636                 printf("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0");     //bug!
 637                 //TODO: EMS4! AND EMS 3.2 MASSIVE DATA HANDLMENT!
 638                 MML_UseSpace(mm->EMSpageframe,(mm->EMSpagesmapped)*0x4000lu, mm);
 639 //printf("EMS3\n");
 640                 MM_MapEMS(mm);                                  // map in used pages
 641 //printf("EMS4\n");
 642                 mmi->EMSmem = (mm->EMSpagesmapped)*0x4000lu;
 643         }
 644
 645 //
 646 // detect XMS and get upper memory blocks
 647 //
 648 emsskip:
 649         mmi->XMSmem = 0;
 650         for(i = 1;i < __argc;i++)
 651         {
 652                 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 653                         goto xmsskip;                           // param NOXMS
 654         }
 655         printf("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0");     //bug!
 656         if(MML_CheckForXMS(mm))
 657         {
 658                 printf("XMS!\n");
 659                 MML_SetupXMS(mm, mmi);                                  // allocate as many UMBs as possible
 660         }
 661
 662 //
 663 // allocate the misc buffer
 664 //
 665 xmsskip:
 666         mm->mmrover = mm->mmhead;               // start looking for space after low block
 667
 668         MM_GetPtr(&(mm->bufferseg),BUFFERSIZE, mm, mmi);
 669 }
 670
 671 //==========================================================================
 672
 673 /*
 674 ====================
 675 =
 676 = MM_Shutdown
 677 =
 678 = Frees all conventional, EMS, and XMS allocated
 679 =
 680 ====================
 681 */
 682
 683 void MM_Shutdown(mminfo_t *mm)
 684 {
 685         if(!(mm->mmstarted))
 686                 return;
 687
 688         _ffree(mm->farheap);
 689         printf("far freed\n");
 690         free(mm->nearheap);
 691         printf("near freed\n");
 692         //hfree(mm->hugeheap);
 693         //printf("huge freed\n");
 694         if(MML_CheckForEMS()){ MML_ShutdownEMS(mm); printf("EMS freed\n"); }
 695         if(MML_CheckForXMS(mm)){ MML_ShutdownXMS(mm); printf("XMS freed\n"); }
 696 }
 697
 698 //==========================================================================
 699
 700 /*
 701 ====================
 702 =
 703 = MM_GetPtr
 704 =
 705 = Allocates an unlocked, unpurgable block
 706 =
 707 ====================
 708 */
 709
 710 void MM_GetPtr(memptr *baseptr,dword size, mminfo_t *mm, mminfotype *mmi)
 711 {
 712         mmblocktype huge *scan,huge *lastscan,huge *endscan,huge *purge,huge *next;
 713         int                     search;
 714         unsigned        needed,startseg;
 715
 716         needed = (size+15)/16;          // convert size from bytes to paragraphs
 717
 718         MM_GetNewBlock(mm);                             // fill in start and next after a spot is found
 719         mm->mmnew->length = needed;
 720         mm->mmnew->useptr = baseptr;
 721         mm->mmnew->attributes = BASEATTRIBUTES;
 722
 723         for(search = 0; search<3; search++)
 724         {
 725         //
 726         // first search:        try to allocate right after the rover, then on up
 727         // second search:       search from the head pointer up to the rover
 728         // third search:        compress memory, then scan from start
 729                 if(search == 1 && mm->mmrover == mm->mmhead)
 730                         search++;
 731
 732                 switch(search)
 733                 {
 734                 case 0:
 735                         lastscan = mm->mmrover;
 736                         scan = mm->mmrover->next;
 737                         endscan = NULL;
 738                         break;
 739                 case 1:
 740                         lastscan = mm->mmhead;
 741                         scan = mm->mmhead->next;
 742                         endscan = mm->mmrover;
 743                         break;
 744                 case 2:
 745                         MM_SortMem(mm);
 746                         lastscan = mm->mmhead;
 747                         scan = mm->mmhead->next;
 748                         endscan = NULL;
 749                         break;
 750                 }
 751
 752                 startseg = lastscan->start + lastscan->length;
 753
 754                 while(scan != endscan)
 755                 {
 756                         if(scan->start - startseg >= needed)
 757                         {
 758                         //
 759                         // got enough space between the end of lastscan and
 760                         // the start of scan, so throw out anything in the middle
 761                         // and allocate the new block
 762                         //
 763                                 purge = lastscan->next;
 764                                 lastscan->next = mm->mmnew;
 765                                 mm->mmnew->start = *(unsigned *)baseptr = startseg;
 766                                 mm->mmnew->next = scan;
 767                                 while(purge != scan)
 768                                 {       // free the purgable block
 769                                         next = purge->next;
 770                                         MM_FreeBlock(purge, mm);
 771                                         purge = next;           // purge another if not at scan
 772                                 }
 773                                 mm->mmrover = mm->mmnew;
 774                                 return; // good allocation!
 775                         }
 776
 777                         //
 778                         // if this block is purge level zero or locked, skip past it
 779                         //
 780                         if((scan->attributes & LOCKBIT)
 781                                 || !(scan->attributes & PURGEBITS) )
 782                         {
 783                                 lastscan = scan;
 784                                 startseg = lastscan->start + lastscan->length;
 785                         }
 786
 787
 788                         scan=scan->next;                // look at next line
 789                 }
 790         }
 791
 792         if (mm->bombonerror)
 793                 printf(OUT_OF_MEM_MSG,(size-mmi->nearheap));
 794         else
 795                 mm->mmerror = true;
 796 }
 797
 798 //==========================================================================
 799
 800 /*
 801 ====================
 802 =
 803 = MM_FreePtr
 804 =
 805 = Allocates an unlocked, unpurgable block
 806 =
 807 ====================
 808 */
 809
 810 void MM_FreePtr(memptr *baseptr, mminfo_t *mm)
 811 {
 812         mmblocktype huge *scan,huge *last;
 813
 814         last = mm->mmhead;
 815         scan = last->next;
 816
 817         if(baseptr == mm->mmrover->useptr)      // removed the last allocated block
 818                 mm->mmrover = mm->mmhead;
 819
 820         while(scan->useptr != baseptr && scan)
 821         {
 822                 last = scan;
 823                 scan = scan->next;
 824         }
 825
 826         if(!scan)
 827         {
 828                 printf("MM_FreePtr: Block not found!");
 829                 return;
 830         }
 831
 832         last->next = scan->next;
 833
 834         MM_FreeBlock(scan, mm);
 835 }
 836 //==========================================================================
 837
 838 /*
 839 =====================
 840 =
 841 = MM_SetPurge
 842 =
 843 = Sets the purge level for a block (locked blocks cannot be made purgable)
 844 =
 845 =====================
 846 */
 847
 848 void MM_SetPurge(memptr *baseptr, int purge, mminfo_t *mm)
 849 {
 850         mmblocktype huge *start;
 851
 852         start = mm->mmrover;
 853
 854         do
 855         {
 856                 if(mm->mmrover->useptr == baseptr)
 857                         break;
 858
 859                 mm->mmrover = mm->mmrover->next;
 860
 861                 if(!mm->mmrover)
 862                         mm->mmrover = mm->mmhead;
 863                 else if(mm->mmrover == start)
 864                 {
 865                         printf("MM_SetPurge: Block not found!");
 866                         return;
 867                 }
 868
 869         } while(1);
 870
 871         mm->mmrover->attributes &= ~PURGEBITS;
 872         mm->mmrover->attributes |= purge;
 873 }
 874
 875 //==========================================================================
 876
 877 /*
 878 =====================
 879 =
 880 = MM_SetLock
 881 =
 882 = Locks / unlocks the block
 883 =
 884 =====================
 885 */
 886
 887 void MM_SetLock(memptr *baseptr, boolean locked, mminfo_t *mm)
 888 {
 889         mmblocktype huge *start;
 890
 891         start = mm->mmrover;
 892
 893         do
 894         {
 895                 if(mm->mmrover->useptr == baseptr)
 896                         break;
 897
 898                 mm->mmrover = mm->mmrover->next;
 899
 900                 if(!mm->mmrover)
 901                         mm->mmrover = mm->mmhead;
 902                 else if(mm->mmrover == start)
 903                 {
 904                         printf("MM_SetLock: Block not found!");
 905                         return;
 906                 }
 907
 908         } while(1);
 909
 910         mm->mmrover->attributes &= ~LOCKBIT;
 911         mm->mmrover->attributes |= locked*LOCKBIT;
 912 }
 913
 914 //==========================================================================
 915
 916 /*
 917 =====================
 918 =
 919 = MM_SortMem
 920 =
 921 = Throws out all purgable stuff and compresses movable blocks
 922 =
 923 =====================
 924 */
 925
 926 void MM_SortMem(mminfo_t *mm)
 927 {
 928         mmblocktype huge *scan,huge *last,huge *next;
 929         unsigned        start,length,source,dest,oldborder;
 930         int                     playing;
 931
 932         //
 933         // lock down a currently playing sound
 934         //
 935 /*++++  playing = SD_SoundPlaying ();
 936         if(playing)
 937         {
 938                 switch (SoundMode)
 939                 {
 940                 case sdm_PC:
 941                         playing += STARTPCSOUNDS;
 942                         break;
 943                 case sdm_AdLib:
 944                         playing += STARTADLIBSOUNDS;
 945                         break;
 946                 }
 947                 MM_SetLock(&(memptr)audiosegs[playing],true);
 948         }
 949
 950
 951         SD_StopSound();*/
 952 //      oldborder = bordercolor;
 953 //      VW_ColorBorder (15);
 954
 955         if(beforesort)
 956                 beforesort();
 957
 958         scan = mm->mmhead;
 959
 960         last = NULL;            // shut up compiler warning
 961
 962         while(scan)
 963         {
 964                 if(scan->attributes & LOCKBIT)
 965                 {
 966                 //
 967                 // block is locked, so try to pile later blocks right after it
 968                 //
 969                         start = scan->start + scan->length;
 970                 }
 971                 else
 972                 {
 973                         if(scan->attributes & PURGEBITS)
 974                         {
 975                         //
 976                         // throw out the purgable block
 977                         //
 978                                 next = scan->next;
 979                                 MM_FreeBlock(scan, mm);
 980                                 last->next = next;
 981                                 scan = next;
 982                                 continue;
 983                         }
 984                         else
 985                         {
 986                         //
 987                         // push the non purgable block on top of the last moved block
 988                         //
 989                                 if(scan->start != start)
 990                                 {
 991                                         length = scan->length;
 992                                         source = scan->start;
 993                                         dest = start;
 994                                         while(length > 0xf00)
 995                                         {
 996                                                 movedata(source,0,dest,0,0xf00*16);
 997                                                 length -= 0xf00;
 998                                                 source += 0xf00;
 999                                                 dest += 0xf00;
1000                                         }
1001                                         movedata(source,0,dest,0,length*16);
1002
1003                                         scan->start = start;
1004                                         *(unsigned *)scan->useptr = start;
1005                                 }
1006                                 start = scan->start + scan->length;
1007                         }
1008                 }
1009
1010                 last = scan;
1011                 scan = scan->next;              // go to next block
1012         }
1013
1014         mm->mmrover = mm->mmhead;
1015
1016         if(aftersort)
1017                 aftersort();
1018
1019 //      VW_ColorBorder (oldborder);
1020
1021 /*++++  if(playing)
1022                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
1023 }
1024
1025
1026 //==========================================================================
1027
1028 //****#if 0
1029 /*
1030 =====================
1031 =
1032 = MM_ShowMemory
1033 =
1034 =====================
1035 */
1036
1037 void MM_ShowMemory(mminfo_t *mm)
1038 {
1039         mmblocktype huge *scan;
1040         unsigned color,temp;
1041         long    end,owner;
1042         char    scratch[160],str[16];
1043
1044 //****  VW_SetDefaultColors();
1045 //****  VW_SetLineWidth(40);
1046 //++++mh        temp = bufferofs;
1047 //++++mh        bufferofs = 0;
1048 //****  VW_SetScreen (0,0);
1049
1050         scan = mm->mmhead;
1051
1052         end = -1;
1053
1054 //CA_OpenDebug ();
1055
1056         while(scan)
1057         {
1058                 if(scan->attributes & PURGEBITS)
1059                         color = 5;              // dark purple = purgable
1060                 else
1061                         color = 9;              // medium blue = non purgable
1062                 if(scan->attributes & LOCKBIT)
1063                         color = 12;             // red = locked
1064                 if(scan->start<=end)
1065                 {
1066                         printf("\nMM_ShowMemory: Memory block order currupted!\n");
1067                         return;
1068                 }
1069                 end = scan->start+scan->length-1;
1070 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1071 //++++          VW_Plot(scan->start,0,15);
1072                 if(scan->next->start > end+1)
1073 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1074
1075 //****#if 0
1076 printf("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0");     //bug!
1077 strcpy(scratch,"Location:");
1078 ultoa (scan->start,str,16);
1079 strcat (scratch,str);
1080 strcat (scratch,"\tSize:");
1081 ltoa ((dword)scan->length*16,str,10);
1082 strcat (scratch,str);
1083 strcat (scratch,"\tOwner:0x");
1084 owner = (unsigned)scan->useptr;
1085 ultoa (owner,str,16);
1086 strcat (scratch,str);
1087 strcat (scratch,"\n");
1088 //++++write (debughandle,scratch,strlen(scratch));
1089 fprintf(stdout, "%s", scratch);
1090 //****#endif
1091
1092                 scan = scan->next;
1093         }
1094
1095 //CA_CloseDebug ();
1096
1097 //++++mh        IN_Ack();
1098 //****  VW_SetLineWidth(64);
1099 //++++mh        bufferofs = temp;
1100 }
1101 //****#endif
1102
1103 //==========================================================================
1104
1105
1106 /*
1107 ======================
1108 =
1109 = MM_UnusedMemory
1110 =
1111 = Returns the total free space without purging
1112 =
1113 ======================
1114 */
1115
1116 dword MM_UnusedMemory(mminfo_t *mm)
1117 {
1118         dword free;
1119         mmblocktype huge *scan;
1120
1121         free = 0;
1122         scan = mm->mmhead;
1123
1124         while(scan->next)
1125         {
1126                 free += scan->next->start - (scan->start + scan->length);
1127                 scan = scan->next;
1128         }
1129
1130         return free*16l;
1131 //      return free;
1132 }
1133
1134 //==========================================================================
1135
1136
1137 /*
1138 ======================
1139 =
1140 = MM_TotalFree
1141 =
1142 = Returns the total free space with purging
1143 =
1144 ======================
1145 */
1146
1147 dword MM_TotalFree(mminfo_t *mm)
1148 {
1149         dword free;
1150         mmblocktype huge *scan;
1151
1152         free = 0;
1153         scan = mm->mmhead;
1154
1155         while(scan->next)
1156         {
1157                 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1158                         free += scan->length;
1159                 free += scan->next->start - (scan->start + scan->length);
1160                 scan = scan->next;
1161         }
1162
1163         return free*16l;
1164 //      return free;
1165 }
1166
1167 //==========================================================================
1168
1169 /*
1170 =====================
1171 =
1172 = MM_Report
1173 =
1174 =====================
1175 */
1176
1177 void MM_Report(mminfo_t *mm, mminfotype *mmi)
1178 {
1179         if(MML_CheckForEMS())
1180         {
1181                 printf("EMM %x available\n", mm->EMSVer);
1182                 printf("totalEMSpages=%u\n", mm->totalEMSpages);
1183                 printf("freeEMSpages=%u\n", mm->freeEMSpages);
1184                 printf("EMSpageframe=%x\n", mm->EMSpageframe);
1185         }
1186         if(MML_CheckForXMS(mm)) printf("XMSaddr=%Fp\n", *XMSaddr);
1187         printf("near=%lu\n", mmi->nearheap);
1188         printf("far=%lu\n", mmi->farheap);
1189         printf("EMSmem=%lu\n", mmi->EMSmem);
1190         printf("XMSmem=%lu\n", mmi->XMSmem);
1191         printf("mainmem=%lu\n", mmi->mainmem);
1192         printf("UnusedMemory=%lu\n", MM_UnusedMemory(mm));
1193         printf("TotalFree=%lu\n", MM_TotalFree(mm));
1194 //      printf("\n");
1195 //      printf("UnusedMemory=%lu kb\n", MM_UnusedMemory()/10248);
1196 //      printf("TotalFree=%lu kb\n", MM_TotalFree()/10248);
1197 }
1198
1199 //==========================================================================
1200
1201 /*
1202 =====================
1203 =
1204 = MM_EMSVer
1205 =
1206 =====================
1207
1208
1209 int MM_EMSVer(void)
1210 {
1211         int EMSver;
1212         __asm
1213         {
1214                 mov             ah,EMS_VERSION
1215                 int             EMS_INT
1216                 mov             EMSver,ax
1217         }
1218         return(EMSver);
1219 }*/
1220
1221 //==========================================================================
1222
1223 /*
1224 =====================
1225 =
1226 = MM_BombOnError
1227 =
1228 =====================
1229 */
1230
1231 void MM_BombOnError(boolean bomb, mminfo_t *mm)
1232 {
1233         mm->bombonerror = bomb;
1234 }
1235
1236 void MM_GetNewBlock(mminfo_t *mm)
1237 {
1238         if(!mm->mmfree)
1239                 MML_ClearBlock(mm);
1240         mm->mmnew=mm->mmfree;
1241         mm->mmfree=mm->mmfree->next;
1242         /*if(!(mm->mmnew=mm->mmfree))
1243         {
1244                 printf("MM_GETNEWBLOCK: No free blocks!");
1245                 return;
1246         }
1247         mm->mmfree=mm->mmfree->next;*/
1248 }
1249
1250 void MM_FreeBlock(mmblocktype *x, mminfo_t *mm)
1251 {
1252         x->useptr=NULL;
1253         x->next=mm->mmfree;
1254         mm->mmfree=x;
1255 }
1256
1257 void MM_seguin(void)
1258 {
1259         __asm
1260         {
1261                 push    ds
1262                 mov     ax,ds
1263                 inc             ax
1264                 mov     ds,ax
1265         }
1266 }
1267
1268 void MM_segude(void)
1269 {
1270         __asm
1271         {
1272                 pop ds
1273         }
1274 }
1275
1276 /*
1277 pull data from far and put it into ds var
1278 mov ax,es:si
1279 mov x,ax
1280 */
1281 /*
1282 ss stack segment
1283 sp top of stack
1284 bp bottem of stack
1285 */