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