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