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         dword   oldend;
 427         ///*d*/word fat=0;
 428         //word segm=0;
 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 //
 444 // take the given range out of the block
 445 //
 446         oldend = scan->start + scan->length;
 447         extra = oldend - (segstart+seglength);
 448         //++++emsver stuff!
 449         if(extra>0xfffflu)
 450         {
 451                 /*__asm
 452                 {
 453                         push    ds
 454                         mov     ax,ds
 455                         inc             ax
 456                         mov     ds,ax
 457                 }*/
 458 printf("extra=%lu       ", extra);
 459 printf("oldend=%lu      ", oldend);
 460 printf("length=%u       ", scan->length);
 461 printf("segstart=%u     ", segstart);
 462 printf("seglength=%lu\n", seglength);
 463
 464 //MML_UseSpace(?segstart?, ?length?, mm);
 465
 466                 /*__asm
 467                 {
 468                         pop ds
 469                 }*/
 470                 //printf("MML_UseSpace: Segment spans two blocks!\n");
 471         }
 472
 473 //segu:
 474 //++++todo: linked list of segment!
 475 //printf("segm=%lu\n", segm);
 476         if(segstart == scan->start)
 477         {
 478                 last->next = scan->next;                        // unlink block
 479                 MM_FreeBlock(scan, mm);
 480                 scan = last;
 481         }
 482         else
 483                 scan->length = segstart-scan->start;    // shorten block
 484
 485 //      segm--;
 486
 487         if(extra > 0)
 488         {
 489                 MM_GetNewBlock(mm);
 490                 mm->mmnew->next = scan->next;
 491                 scan->next = mm->mmnew;
 492                 mm->mmnew->start = segstart+seglength;
 493                 mm->mmnew->length = extra;
 494                 mm->mmnew->attributes = LOCKBIT;
 495         }//else if(segm>0) goto segu;
 496
 497 }
 498
 499 //==========================================================================
 500
 501 /*
 502 ====================
 503 =
 504 = MML_ClearBlock
 505 =
 506 = We are out of blocks, so free a purgable block
 507 =
 508 ====================
 509 */
 510
 511 void MML_ClearBlock(mminfo_t *mm)
 512 {
 513         mmblocktype huge *scan,huge *last;
 514
 515         scan = mm->mmhead->next;
 516
 517         while(scan)
 518         {
 519                 if(!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS))
 520                 {
 521                         MM_FreePtr(scan->useptr, mm);
 522                         return;
 523                 }
 524                 scan = scan->next;
 525         }
 526
 527         printf("MM_ClearBlock: No purgable blocks!\n");
 528 }
 529
 530
 531 //==========================================================================
 532
 533 /*
 534 ===================
 535 =
 536 = MM_Startup
 537 =
 538 = Grabs all space from turbo with malloc/farmalloc
 539 = Allocates bufferseg misc buffer
 540 =
 541 ===================
 542 */
 543
 544 void MM_Startup(mminfo_t *mm, mminfotype *mmi)
 545 {
 546         int i;
 547         dword length;//,farlen;
 548         void huge       *start;
 549         unsigned        segstart,seglength,endfree;
 550
 551         if(mm->mmstarted)
 552                 MM_Shutdown(mm);
 553
 554         mm->mmstarted = true;
 555         mm->bombonerror = true;
 556 //
 557 // set up the linked list (everything in the free list;
 558 //
 559         mm->mmhead = NULL;
 560         mm->mmfree = &(mm->mmblocks[0]);
 561         for(i=0;i<MAXBLOCKS-1;i++)
 562         {
 563                 mm->mmblocks[i].next = &(mm->mmblocks[i+1]);
 564         }
 565         mm->mmblocks[i].next = NULL;
 566
 567 //
 568 // locked block of all memory until we punch out free space
 569 //
 570         MM_GetNewBlock(mm);
 571         mm->mmhead = mm->mmnew;                         // this will allways be the first node
 572         mm->mmnew->start = 0;
 573         mm->mmnew->length = 0xffff;                     //todo: mm make it fucking massive as fuck!~
 574         mm->mmnew->attributes = LOCKBIT;
 575         mm->mmnew->next = NULL;
 576         mm->mmrover = mm->mmhead;
 577
 578 //      farlen=_bios_memsize()*1024;
 579
 580 //
 581 // get all available near conventional memory segments
 582 //
 583 //----  length=coreleft();
 584         _nheapgrow();
 585         length=_memavl();
 586         start = (void huge *)(mm->nearheap = malloc(length));
 587
 588         length -= 16-(FP_OFF(start)&15);
 589         length -= SAVENEARHEAP;
 590         seglength = length / 16;                        // now in paragraphs
 591         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 592         MML_UseSpace(segstart,seglength, mm);
 593         mmi->nearheap = length;
 594
 595 //
 596 // get all available far conventional memory segments
 597 //
 598 //----  length=farcoreleft();
 599         _fheapgrow();
 600         length=_memavl();
 601         //length-=farlen;
 602         start = mm->farheap = halloc(length, sizeof(dword));
 603         //start = mm->farheap = _fmalloc(length);
 604         length -= 16-(FP_OFF(start)&15);
 605         length -= SAVEFARHEAP;
 606         seglength = length / 16;                        // now in paragraphs
 607         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 608         MML_UseSpace(segstart,seglength, mm);
 609         mmi->farheap = length;
 610         mmi->mainmem = mmi->nearheap + mmi->farheap;
 611
 612
 613 //
 614 // detect EMS and allocate up to 64K at page frame
 615 //
 616         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!
 617         mmi->EMSmem = 0;
 618         for(i = 1;i < __argc;i++)
 619         {
 620                 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 621                         goto emsskip;                           // param NOEMS
 622         }
 623         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!
 624         if(MML_CheckForEMS())
 625         {
 626 //printf("EMS1\n");
 627                 MML_SetupEMS(mm);                                       // allocate space
 628                 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!
 629                 //TODO: EMS4! AND EMS 3.2 MASSIVE DATA HANDLMENT!
 630                 MML_UseSpace(mm->EMSpageframe,(mm->EMSpagesmapped)*0x4000lu, mm);
 631 //printf("EMS3\n");
 632                 MM_MapEMS(mm);                                  // map in used pages
 633 //printf("EMS4\n");
 634                 mmi->EMSmem = (mm->EMSpagesmapped)*0x4000lu;
 635         }
 636
 637 //
 638 // detect XMS and get upper memory blocks
 639 //
 640 emsskip:
 641         mmi->XMSmem = 0;
 642         for(i = 1;i < __argc;i++)
 643         {
 644                 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 645                         goto xmsskip;                           // param NOXMS
 646         }
 647 //      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!
 648         if(MML_CheckForXMS(mm))
 649         {
 650                 printf("XMS!\n");
 651                 MML_SetupXMS(mm, mmi);                                  // allocate as many UMBs as possible
 652         }
 653
 654 //
 655 // allocate the misc buffer
 656 //
 657 xmsskip:
 658         mm->mmrover = mm->mmhead;               // start looking for space after low block
 659
 660         MM_GetPtr(&(mm->bufferseg),BUFFERSIZE, mm, mmi);
 661 }
 662
 663 //==========================================================================
 664
 665 /*
 666 ====================
 667 =
 668 = MM_Shutdown
 669 =
 670 = Frees all conventional, EMS, and XMS allocated
 671 =
 672 ====================
 673 */
 674
 675 void MM_Shutdown(mminfo_t *mm)
 676 {
 677         if(!(mm->mmstarted))
 678                 return;
 679
 680         _ffree(mm->farheap);
 681         printf("far freed\n");
 682         free(mm->nearheap);
 683         printf("near freed\n");
 684         //hfree(mm->hugeheap);
 685         //printf("huge freed\n");
 686         if(MML_CheckForEMS()){ MML_ShutdownEMS(mm); printf("EMS freed\n"); }
 687         if(MML_CheckForXMS(mm)){ MML_ShutdownXMS(mm); printf("XMS freed\n"); }
 688 }
 689
 690 //==========================================================================
 691
 692 /*
 693 ====================
 694 =
 695 = MM_GetPtr
 696 =
 697 = Allocates an unlocked, unpurgable block
 698 =
 699 ====================
 700 */
 701
 702 void MM_GetPtr(memptr *baseptr,dword size, mminfo_t *mm, mminfotype *mmi)
 703 {
 704         mmblocktype huge *scan,huge *lastscan,huge *endscan,huge *purge,huge *next;
 705         int                     search;
 706         unsigned        needed,startseg;
 707
 708         needed = (size+15)/16;          // convert size from bytes to paragraphs
 709
 710         MM_GetNewBlock(mm);                             // fill in start and next after a spot is found
 711         mm->mmnew->length = needed;
 712         mm->mmnew->useptr = baseptr;
 713         mm->mmnew->attributes = BASEATTRIBUTES;
 714
 715         for(search = 0; search<3; search++)
 716         {
 717         //
 718         // first search:        try to allocate right after the rover, then on up
 719         // second search:       search from the head pointer up to the rover
 720         // third search:        compress memory, then scan from start
 721                 if(search == 1 && mm->mmrover == mm->mmhead)
 722                         search++;
 723
 724                 switch(search)
 725                 {
 726                 case 0:
 727                         lastscan = mm->mmrover;
 728                         scan = mm->mmrover->next;
 729                         endscan = NULL;
 730                         break;
 731                 case 1:
 732                         lastscan = mm->mmhead;
 733                         scan = mm->mmhead->next;
 734                         endscan = mm->mmrover;
 735                         break;
 736                 case 2:
 737                         MM_SortMem(mm);
 738                         lastscan = mm->mmhead;
 739                         scan = mm->mmhead->next;
 740                         endscan = NULL;
 741                         break;
 742                 }
 743
 744                 startseg = lastscan->start + lastscan->length;
 745
 746                 while(scan != endscan)
 747                 {
 748                         if(scan->start - startseg >= needed)
 749                         {
 750                         //
 751                         // got enough space between the end of lastscan and
 752                         // the start of scan, so throw out anything in the middle
 753                         // and allocate the new block
 754                         //
 755                                 purge = lastscan->next;
 756                                 lastscan->next = mm->mmnew;
 757                                 mm->mmnew->start = *(unsigned *)baseptr = startseg;
 758                                 mm->mmnew->next = scan;
 759                                 while(purge != scan)
 760                                 {       // free the purgable block
 761                                         next = purge->next;
 762                                         MM_FreeBlock(purge, mm);
 763                                         purge = next;           // purge another if not at scan
 764                                 }
 765                                 mm->mmrover = mm->mmnew;
 766                                 return; // good allocation!
 767                         }
 768
 769                         //
 770                         // if this block is purge level zero or locked, skip past it
 771                         //
 772                         if((scan->attributes & LOCKBIT)
 773                                 || !(scan->attributes & PURGEBITS) )
 774                         {
 775                                 lastscan = scan;
 776                                 startseg = lastscan->start + lastscan->length;
 777                         }
 778
 779
 780                         scan=scan->next;                // look at next line
 781                 }
 782         }
 783
 784         if (mm->bombonerror)
 785                 printf(OUT_OF_MEM_MSG,(size-mmi->nearheap));
 786         else
 787                 mm->mmerror = true;
 788 }
 789
 790 //==========================================================================
 791
 792 /*
 793 ====================
 794 =
 795 = MM_FreePtr
 796 =
 797 = Allocates an unlocked, unpurgable block
 798 =
 799 ====================
 800 */
 801
 802 void MM_FreePtr(memptr *baseptr, mminfo_t *mm)
 803 {
 804         mmblocktype huge *scan,huge *last;
 805
 806         last = mm->mmhead;
 807         scan = last->next;
 808
 809         if(baseptr == mm->mmrover->useptr)      // removed the last allocated block
 810                 mm->mmrover = mm->mmhead;
 811
 812         while(scan->useptr != baseptr && scan)
 813         {
 814                 last = scan;
 815                 scan = scan->next;
 816         }
 817
 818         if(!scan)
 819         {
 820                 printf("MM_FreePtr: Block not found!");
 821                 return;
 822         }
 823
 824         last->next = scan->next;
 825
 826         MM_FreeBlock(scan, mm);
 827 }
 828 //==========================================================================
 829
 830 /*
 831 =====================
 832 =
 833 = MM_SetPurge
 834 =
 835 = Sets the purge level for a block (locked blocks cannot be made purgable)
 836 =
 837 =====================
 838 */
 839
 840 void MM_SetPurge(memptr *baseptr, int purge, mminfo_t *mm)
 841 {
 842         mmblocktype huge *start;
 843
 844         start = mm->mmrover;
 845
 846         do
 847         {
 848                 if(mm->mmrover->useptr == baseptr)
 849                         break;
 850
 851                 mm->mmrover = mm->mmrover->next;
 852
 853                 if(!mm->mmrover)
 854                         mm->mmrover = mm->mmhead;
 855                 else if(mm->mmrover == start)
 856                 {
 857                         printf("MM_SetPurge: Block not found!");
 858                         return;
 859                 }
 860
 861         } while(1);
 862
 863         mm->mmrover->attributes &= ~PURGEBITS;
 864         mm->mmrover->attributes |= purge;
 865 }
 866
 867 //==========================================================================
 868
 869 /*
 870 =====================
 871 =
 872 = MM_SetLock
 873 =
 874 = Locks / unlocks the block
 875 =
 876 =====================
 877 */
 878
 879 void MM_SetLock(memptr *baseptr, boolean locked, mminfo_t *mm)
 880 {
 881         mmblocktype huge *start;
 882
 883         start = mm->mmrover;
 884
 885         do
 886         {
 887                 if(mm->mmrover->useptr == baseptr)
 888                         break;
 889
 890                 mm->mmrover = mm->mmrover->next;
 891
 892                 if(!mm->mmrover)
 893                         mm->mmrover = mm->mmhead;
 894                 else if(mm->mmrover == start)
 895                 {
 896                         printf("MM_SetLock: Block not found!");
 897                         return;
 898                 }
 899
 900         } while(1);
 901
 902         mm->mmrover->attributes &= ~LOCKBIT;
 903         mm->mmrover->attributes |= locked*LOCKBIT;
 904 }
 905
 906 //==========================================================================
 907
 908 /*
 909 =====================
 910 =
 911 = MM_SortMem
 912 =
 913 = Throws out all purgable stuff and compresses movable blocks
 914 =
 915 =====================
 916 */
 917
 918 void MM_SortMem(mminfo_t *mm)
 919 {
 920         mmblocktype huge *scan,huge *last,huge *next;
 921         unsigned        start,length,source,dest,oldborder;
 922         int                     playing;
 923
 924         //
 925         // lock down a currently playing sound
 926         //
 927 /*++++  playing = SD_SoundPlaying ();
 928         if(playing)
 929         {
 930                 switch (SoundMode)
 931                 {
 932                 case sdm_PC:
 933                         playing += STARTPCSOUNDS;
 934                         break;
 935                 case sdm_AdLib:
 936                         playing += STARTADLIBSOUNDS;
 937                         break;
 938                 }
 939                 MM_SetLock(&(memptr)audiosegs[playing],true);
 940         }
 941
 942
 943         SD_StopSound();*/
 944 //      oldborder = bordercolor;
 945 //      VW_ColorBorder (15);
 946
 947         if(beforesort)
 948                 beforesort();
 949
 950         scan = mm->mmhead;
 951
 952         last = NULL;            // shut up compiler warning
 953
 954         while(scan)
 955         {
 956                 if(scan->attributes & LOCKBIT)
 957                 {
 958                 //
 959                 // block is locked, so try to pile later blocks right after it
 960                 //
 961                         start = scan->start + scan->length;
 962                 }
 963                 else
 964                 {
 965                         if(scan->attributes & PURGEBITS)
 966                         {
 967                         //
 968                         // throw out the purgable block
 969                         //
 970                                 next = scan->next;
 971                                 MM_FreeBlock(scan, mm);
 972                                 last->next = next;
 973                                 scan = next;
 974                                 continue;
 975                         }
 976                         else
 977                         {
 978                         //
 979                         // push the non purgable block on top of the last moved block
 980                         //
 981                                 if(scan->start != start)
 982                                 {
 983                                         length = scan->length;
 984                                         source = scan->start;
 985                                         dest = start;
 986                                         while(length > 0xf00)
 987                                         {
 988                                                 movedata(source,0,dest,0,0xf00*16);
 989                                                 length -= 0xf00;
 990                                                 source += 0xf00;
 991                                                 dest += 0xf00;
 992                                         }
 993                                         movedata(source,0,dest,0,length*16);
 994
 995                                         scan->start = start;
 996                                         *(unsigned *)scan->useptr = start;
 997                                 }
 998                                 start = scan->start + scan->length;
 999                         }
1000                 }
1001
1002                 last = scan;
1003                 scan = scan->next;              // go to next block
1004         }
1005
1006         mm->mmrover = mm->mmhead;
1007
1008         if(aftersort)
1009                 aftersort();
1010
1011 //      VW_ColorBorder (oldborder);
1012
1013 /*++++  if(playing)
1014                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
1015 }
1016
1017
1018 //==========================================================================
1019
1020 //****#if 0
1021 /*
1022 =====================
1023 =
1024 = MM_ShowMemory
1025 =
1026 =====================
1027 */
1028
1029 void MM_ShowMemory(mminfo_t *mm)
1030 {
1031         mmblocktype huge *scan;
1032         unsigned color,temp;//, i;
1033         long    end,owner;
1034         char    scratch[80],str[10];
1035
1036 //****  VW_SetDefaultColors();
1037 //****  VW_SetLineWidth(40);
1038 //++++mh        temp = bufferofs;
1039 //++++mh        bufferofs = 0;
1040 //****  VW_SetScreen (0,0);
1041
1042         scan = mm->mmhead;
1043
1044         end = -1;
1045
1046 //CA_OpenDebug ();
1047
1048         while (scan)
1049         {
1050                 if(scan->attributes & PURGEBITS)
1051                         color = 5;              // dark purple = purgable
1052                 else
1053                         color = 9;              // medium blue = non purgable
1054                 if(scan->attributes & LOCKBIT)
1055                         color = 12;             // red = locked
1056                 if(scan->start<=end)
1057                 {
1058                         printf("MM_ShowMemory: Memory block order currupted!");
1059                         return;
1060                 }
1061                 end = scan->start+scan->length-1;
1062 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1063 //++++          VW_Plot(scan->start,0,15);
1064                 if(scan->next->start > end+1)
1065 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1066
1067 //****#if 0
1068 printf("Location:");
1069 printf("%x\t", scan->start);
1070 strcpy (scratch,"Size:");
1071 ltoa ((dword)scan->length*16,str,10);
1072 strcat (scratch,str);
1073 strcat (scratch,"\tOwner:0x");
1074 owner = (unsigned)scan->useptr;
1075 ultoa (owner,str,16);
1076 strcat (scratch,str);
1077 strcat (scratch,"\n");
1078 //++++write (debughandle,scratch,strlen(scratch));
1079 fprintf(stdout, "%s", scratch);
1080 //****#endif
1081
1082                 scan = scan->next;
1083         }
1084
1085 //CA_CloseDebug ();
1086
1087 //++++mh        IN_Ack();
1088 //****  VW_SetLineWidth(64);
1089 //++++mh        bufferofs = temp;
1090 }
1091 //****#endif
1092
1093 //==========================================================================
1094
1095
1096 /*
1097 ======================
1098 =
1099 = MM_UnusedMemory
1100 =
1101 = Returns the total free space without purging
1102 =
1103 ======================
1104 */
1105
1106 dword MM_UnusedMemory(mminfo_t *mm)
1107 {
1108         dword free;
1109         mmblocktype huge *scan;
1110
1111         free = 0;
1112         scan = mm->mmhead;
1113
1114         while(scan->next)
1115         {
1116                 free += scan->next->start - (scan->start + scan->length);
1117                 scan = scan->next;
1118         }
1119
1120         return free*16l;
1121 //      return free;
1122 }
1123
1124 //==========================================================================
1125
1126
1127 /*
1128 ======================
1129 =
1130 = MM_TotalFree
1131 =
1132 = Returns the total free space with purging
1133 =
1134 ======================
1135 */
1136
1137 dword MM_TotalFree(mminfo_t *mm)
1138 {
1139         dword free;
1140         mmblocktype huge *scan;
1141
1142         free = 0;
1143         scan = mm->mmhead;
1144
1145         while(scan->next)
1146         {
1147                 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1148                         free += scan->length;
1149                 free += scan->next->start - (scan->start + scan->length);
1150                 scan = scan->next;
1151         }
1152
1153         return free*16l;
1154 //      return free;
1155 }
1156
1157 //==========================================================================
1158
1159 /*
1160 =====================
1161 =
1162 = MM_Report
1163 =
1164 =====================
1165 */
1166
1167 void MM_Report(mminfo_t *mm, mminfotype *mmi)
1168 {
1169         if(MML_CheckForEMS())
1170         {
1171                 printf("EMM %x available\n", mm->EMSVer);
1172                 printf("totalEMSpages=%u\n", mm->totalEMSpages);
1173                 printf("freeEMSpages=%u\n", mm->freeEMSpages);
1174                 printf("EMSpageframe=%x\n", mm->EMSpageframe);
1175         }
1176         if(MML_CheckForXMS(mm)) printf("XMSaddr=%Fp\n", *XMSaddr);
1177         printf("near=%lu\n", mmi->nearheap);
1178         printf("far=%lu\n", mmi->farheap);
1179         printf("EMSmem=%lu\n", mmi->EMSmem);
1180         printf("XMSmem=%lu\n", mmi->XMSmem);
1181         printf("mainmem=%lu\n", mmi->mainmem);
1182         printf("UnusedMemory=%lu\n", MM_UnusedMemory(mm));
1183         printf("TotalFree=%lu\n", MM_TotalFree(mm));
1184 //      printf("\n");
1185 //      printf("UnusedMemory=%lu kb\n", MM_UnusedMemory()/10248);
1186 //      printf("TotalFree=%lu kb\n", MM_TotalFree()/10248);
1187 }
1188
1189 //==========================================================================
1190
1191 /*
1192 =====================
1193 =
1194 = MM_EMSVer
1195 =
1196 =====================
1197
1198
1199 int MM_EMSVer(void)
1200 {
1201         int EMSver;
1202         __asm
1203         {
1204                 mov             ah,EMS_VERSION
1205                 int             EMS_INT
1206                 mov             EMSver,ax
1207         }
1208         return(EMSver);
1209 }*/
1210
1211 //==========================================================================
1212
1213 /*
1214 =====================
1215 =
1216 = MM_BombOnError
1217 =
1218 =====================
1219 */
1220
1221 void MM_BombOnError(boolean bomb, mminfo_t *mm)
1222 {
1223         mm->bombonerror = bomb;
1224 }
1225
1226 void MM_GetNewBlock(mminfo_t *mm)
1227 {
1228         if(!mm->mmfree)
1229                 MML_ClearBlock(mm);
1230         mm->mmnew=mm->mmfree;
1231         mm->mmfree=mm->mmfree->next;
1232         /*if(!(mm->mmnew=mm->mmfree))
1233         {
1234                 printf("MM_GETNEWBLOCK: No free blocks!");
1235                 return;
1236         }
1237         mm->mmfree=mm->mmfree->next;*/
1238 }
1239
1240 void MM_FreeBlock(mmblocktype *x, mminfo_t *mm)
1241 {
1242         x->useptr=NULL;
1243         x->next=mm->mmfree;
1244         mm->mmfree=x;
1245 }
1246
1247 void MM_seguin(void)
1248 {
1249         __asm
1250         {
1251                 push    ds
1252                 mov     ax,ds
1253                 inc             ax
1254                 mov     ds,ax
1255         }
1256 }
1257
1258 void MM_segude(void)
1259 {
1260         __asm
1261         {
1262                 pop ds
1263         }
1264 }
1265
1266 /*
1267 pull data from far and put it into ds var
1268 mov ax,es:si
1269 mov x,ax
1270 */
1271 /*
1272 ss stack segment
1273 sp top of stack
1274 bp bottem of stack
1275 */