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, /*d*/word seglength, mminfo_t *mm)
 424 {
 425         mmblocktype huge *scan,huge *last;
 426         /*d*/word       oldend;
 427         /*d*/word fat=0;
 428         word segm=0;
 429         /*d*/word               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                 /*segm=(extra%(0xfffflu))-1;
 452                 fat=segm*(0xfffflu);
 453                 extra-=fat;*/
 454 /*printf("extra=%lu     ", extra);
 455 printf("oldend=%lu      ", oldend);
 456 printf("segm=%lu\n", segm);*/
 457                 printf("MML_UseSpace: Segment spans two blocks!\n");
 458         }
 459
 460 //segu:
 461 //++++todo: linked list of segment!
 462 //printf("segm=%lu\n", segm);
 463         if(segstart == scan->start)
 464         {
 465                 last->next = scan->next;                        // unlink block
 466                 MM_FreeBlock(scan, mm);
 467                 scan = last;
 468         }
 469         else
 470                 scan->length = segstart-scan->start;    // shorten block
 471
 472 //      segm--;
 473
 474         if(extra > 0)
 475         {
 476                 MM_GetNewBlock(mm);
 477                 mm->mmnew->next = scan->next;
 478                 scan->next = mm->mmnew;
 479                 mm->mmnew->start = segstart+seglength;
 480                 mm->mmnew->length = extra;
 481                 mm->mmnew->attributes = LOCKBIT;
 482         }//else if(segm>0) goto segu;
 483
 484 }
 485
 486 //==========================================================================
 487
 488 /*
 489 ====================
 490 =
 491 = MML_ClearBlock
 492 =
 493 = We are out of blocks, so free a purgable block
 494 =
 495 ====================
 496 */
 497
 498 void MML_ClearBlock(mminfo_t *mm)
 499 {
 500         mmblocktype huge *scan,huge *last;
 501
 502         scan = mm->mmhead->next;
 503
 504         while(scan)
 505         {
 506                 if(!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS))
 507                 {
 508                         MM_FreePtr(scan->useptr, mm);
 509                         return;
 510                 }
 511                 scan = scan->next;
 512         }
 513
 514         printf("MM_ClearBlock: No purgable blocks!\n");
 515 }
 516
 517
 518 //==========================================================================
 519
 520 /*
 521 ===================
 522 =
 523 = MM_Startup
 524 =
 525 = Grabs all space from turbo with malloc/farmalloc
 526 = Allocates bufferseg misc buffer
 527 =
 528 ===================
 529 */
 530
 531 void MM_Startup(mminfo_t *mm, mminfotype *mmi)
 532 {
 533         int i;
 534         dword length;//,farlen;
 535         void huge       *start;
 536         unsigned        segstart,seglength,endfree;
 537
 538         if(mm->mmstarted)
 539                 MM_Shutdown(mm);
 540
 541         mm->mmstarted = true;
 542         mm->bombonerror = true;
 543 //
 544 // set up the linked list (everything in the free list;
 545 //
 546         mm->mmhead = NULL;
 547         mm->mmfree = &(mm->mmblocks[0]);
 548         for(i=0;i<MAXBLOCKS-1;i++)
 549         {
 550                 mm->mmblocks[i].next = &(mm->mmblocks[i+1]);
 551         }
 552         mm->mmblocks[i].next = NULL;
 553
 554 //
 555 // locked block of all memory until we punch out free space
 556 //
 557         MM_GetNewBlock(mm);
 558         mm->mmhead = mm->mmnew;                         // this will allways be the first node
 559         mm->mmnew->start = 0;
 560         mm->mmnew->length = 0xffff;                     //todo: mm make it fucking massive as fuck!~
 561         mm->mmnew->attributes = LOCKBIT;
 562         mm->mmnew->next = NULL;
 563         mm->mmrover = mm->mmhead;
 564
 565 //      farlen=_bios_memsize()*1024;
 566
 567 //
 568 // get all available near conventional memory segments
 569 //
 570 //----  length=coreleft();
 571         _nheapgrow();
 572         length=_memavl();
 573         start = (void huge *)(mm->nearheap = malloc(length));
 574
 575         length -= 16-(FP_OFF(start)&15);
 576         length -= SAVENEARHEAP;
 577         seglength = length / 16;                        // now in paragraphs
 578         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 579         MML_UseSpace(segstart,seglength, mm);
 580         mmi->nearheap = length;
 581
 582 //
 583 // get all available far conventional memory segments
 584 //
 585 //----  length=farcoreleft();
 586         _fheapgrow();
 587         length=_memavl();
 588         //length-=farlen;
 589         start = mm->farheap = halloc(length, sizeof(dword));
 590         //start = mm->farheap = _fmalloc(length);
 591         length -= 16-(FP_OFF(start)&15);
 592         length -= SAVEFARHEAP;
 593         seglength = length / 16;                        // now in paragraphs
 594         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 595         MML_UseSpace(segstart,seglength, mm);
 596         mmi->farheap = length;
 597         mmi->mainmem = mmi->nearheap + mmi->farheap;
 598
 599
 600 //
 601 // detect EMS and allocate up to 64K at page frame
 602 //
 603         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!
 604         mmi->EMSmem = 0;
 605         for(i = 1;i < __argc;i++)
 606         {
 607                 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 608                         goto emsskip;                           // param NOEMS
 609         }
 610         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!
 611         if(MML_CheckForEMS())
 612         {
 613 //printf("EMS1\n");
 614                 MML_SetupEMS(mm);                                       // allocate space
 615                 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!
 616                 //TODO: EMS4! AND EMS 3.2 MASSIVE DATA HANDLMENT!
 617                 MML_UseSpace(mm->EMSpageframe,(/*mm->EMSpagesmapped*/4)*0x4000lu, mm);
 618 //printf("EMS3\n");
 619                 MM_MapEMS(mm);                                  // map in used pages
 620 //printf("EMS4\n");
 621                 mmi->EMSmem = (/*mm->EMSpagesmapped*/4)*0x4000lu;
 622         }
 623
 624 //
 625 // detect XMS and get upper memory blocks
 626 //
 627 emsskip:
 628         mmi->XMSmem = 0;
 629         for(i = 1;i < __argc;i++)
 630         {
 631                 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 632                         goto xmsskip;                           // param NOXMS
 633         }
 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         if(MML_CheckForXMS(mm))
 636         {
 637                 printf("XMS!\n");
 638                 MML_SetupXMS(mm, mmi);                                  // allocate as many UMBs as possible
 639         }
 640
 641 //
 642 // allocate the misc buffer
 643 //
 644 xmsskip:
 645         mm->mmrover = mm->mmhead;               // start looking for space after low block
 646
 647         MM_GetPtr(&(mm->bufferseg),BUFFERSIZE, mm, mmi);
 648 }
 649
 650 //==========================================================================
 651
 652 /*
 653 ====================
 654 =
 655 = MM_Shutdown
 656 =
 657 = Frees all conventional, EMS, and XMS allocated
 658 =
 659 ====================
 660 */
 661
 662 void MM_Shutdown(mminfo_t *mm)
 663 {
 664         if(!(mm->mmstarted))
 665                 return;
 666
 667         _ffree(mm->farheap);
 668         printf("far freed\n");
 669         free(mm->nearheap);
 670         printf("near freed\n");
 671         //hfree(mm->hugeheap);
 672         //printf("huge freed\n");
 673         if(MML_CheckForEMS()){ MML_ShutdownEMS(mm); printf("EMS freed\n"); }
 674         if(MML_CheckForXMS(mm)){ MML_ShutdownXMS(mm); printf("XMS freed\n"); }
 675 }
 676
 677 //==========================================================================
 678
 679 /*
 680 ====================
 681 =
 682 = MM_GetPtr
 683 =
 684 = Allocates an unlocked, unpurgable block
 685 =
 686 ====================
 687 */
 688
 689 void MM_GetPtr(memptr *baseptr,dword size, mminfo_t *mm, mminfotype *mmi)
 690 {
 691         mmblocktype huge *scan,huge *lastscan,huge *endscan,huge *purge,huge *next;
 692         int                     search;
 693         unsigned        needed,startseg;
 694
 695         needed = (size+15)/16;          // convert size from bytes to paragraphs
 696
 697         MM_GetNewBlock(mm);                             // fill in start and next after a spot is found
 698         mm->mmnew->length = needed;
 699         mm->mmnew->useptr = baseptr;
 700         mm->mmnew->attributes = BASEATTRIBUTES;
 701
 702         for(search = 0; search<3; search++)
 703         {
 704         //
 705         // first search:        try to allocate right after the rover, then on up
 706         // second search:       search from the head pointer up to the rover
 707         // third search:        compress memory, then scan from start
 708                 if(search == 1 && mm->mmrover == mm->mmhead)
 709                         search++;
 710
 711                 switch(search)
 712                 {
 713                 case 0:
 714                         lastscan = mm->mmrover;
 715                         scan = mm->mmrover->next;
 716                         endscan = NULL;
 717                         break;
 718                 case 1:
 719                         lastscan = mm->mmhead;
 720                         scan = mm->mmhead->next;
 721                         endscan = mm->mmrover;
 722                         break;
 723                 case 2:
 724                         MM_SortMem(mm);
 725                         lastscan = mm->mmhead;
 726                         scan = mm->mmhead->next;
 727                         endscan = NULL;
 728                         break;
 729                 }
 730
 731                 startseg = lastscan->start + lastscan->length;
 732
 733                 while(scan != endscan)
 734                 {
 735                         if(scan->start - startseg >= needed)
 736                         {
 737                         //
 738                         // got enough space between the end of lastscan and
 739                         // the start of scan, so throw out anything in the middle
 740                         // and allocate the new block
 741                         //
 742                                 purge = lastscan->next;
 743                                 lastscan->next = mm->mmnew;
 744                                 mm->mmnew->start = *(unsigned *)baseptr = startseg;
 745                                 mm->mmnew->next = scan;
 746                                 while(purge != scan)
 747                                 {       // free the purgable block
 748                                         next = purge->next;
 749                                         MM_FreeBlock(purge, mm);
 750                                         purge = next;           // purge another if not at scan
 751                                 }
 752                                 mm->mmrover = mm->mmnew;
 753                                 return; // good allocation!
 754                         }
 755
 756                         //
 757                         // if this block is purge level zero or locked, skip past it
 758                         //
 759                         if((scan->attributes & LOCKBIT)
 760                                 || !(scan->attributes & PURGEBITS) )
 761                         {
 762                                 lastscan = scan;
 763                                 startseg = lastscan->start + lastscan->length;
 764                         }
 765
 766
 767                         scan=scan->next;                // look at next line
 768                 }
 769         }
 770
 771         if (mm->bombonerror)
 772                 printf(OUT_OF_MEM_MSG,(size-mmi->nearheap));
 773         else
 774                 mm->mmerror = true;
 775 }
 776
 777 //==========================================================================
 778
 779 /*
 780 ====================
 781 =
 782 = MM_FreePtr
 783 =
 784 = Allocates an unlocked, unpurgable block
 785 =
 786 ====================
 787 */
 788
 789 void MM_FreePtr(memptr *baseptr, mminfo_t *mm)
 790 {
 791         mmblocktype huge *scan,huge *last;
 792
 793         last = mm->mmhead;
 794         scan = last->next;
 795
 796         if(baseptr == mm->mmrover->useptr)      // removed the last allocated block
 797                 mm->mmrover = mm->mmhead;
 798
 799         while(scan->useptr != baseptr && scan)
 800         {
 801                 last = scan;
 802                 scan = scan->next;
 803         }
 804
 805         if(!scan)
 806         {
 807                 printf("MM_FreePtr: Block not found!");
 808                 return;
 809         }
 810
 811         last->next = scan->next;
 812
 813         MM_FreeBlock(scan, mm);
 814 }
 815 //==========================================================================
 816
 817 /*
 818 =====================
 819 =
 820 = MM_SetPurge
 821 =
 822 = Sets the purge level for a block (locked blocks cannot be made purgable)
 823 =
 824 =====================
 825 */
 826
 827 void MM_SetPurge(memptr *baseptr, int purge, mminfo_t *mm)
 828 {
 829         mmblocktype huge *start;
 830
 831         start = mm->mmrover;
 832
 833         do
 834         {
 835                 if(mm->mmrover->useptr == baseptr)
 836                         break;
 837
 838                 mm->mmrover = mm->mmrover->next;
 839
 840                 if(!mm->mmrover)
 841                         mm->mmrover = mm->mmhead;
 842                 else if(mm->mmrover == start)
 843                 {
 844                         printf("MM_SetPurge: Block not found!");
 845                         return;
 846                 }
 847
 848         } while(1);
 849
 850         mm->mmrover->attributes &= ~PURGEBITS;
 851         mm->mmrover->attributes |= purge;
 852 }
 853
 854 //==========================================================================
 855
 856 /*
 857 =====================
 858 =
 859 = MM_SetLock
 860 =
 861 = Locks / unlocks the block
 862 =
 863 =====================
 864 */
 865
 866 void MM_SetLock(memptr *baseptr, boolean locked, mminfo_t *mm)
 867 {
 868         mmblocktype huge *start;
 869
 870         start = mm->mmrover;
 871
 872         do
 873         {
 874                 if(mm->mmrover->useptr == baseptr)
 875                         break;
 876
 877                 mm->mmrover = mm->mmrover->next;
 878
 879                 if(!mm->mmrover)
 880                         mm->mmrover = mm->mmhead;
 881                 else if(mm->mmrover == start)
 882                 {
 883                         printf("MM_SetLock: Block not found!");
 884                         return;
 885                 }
 886
 887         } while(1);
 888
 889         mm->mmrover->attributes &= ~LOCKBIT;
 890         mm->mmrover->attributes |= locked*LOCKBIT;
 891 }
 892
 893 //==========================================================================
 894
 895 /*
 896 =====================
 897 =
 898 = MM_SortMem
 899 =
 900 = Throws out all purgable stuff and compresses movable blocks
 901 =
 902 =====================
 903 */
 904
 905 void MM_SortMem(mminfo_t *mm)
 906 {
 907         mmblocktype huge *scan,huge *last,huge *next;
 908         unsigned        start,length,source,dest,oldborder;
 909         int                     playing;
 910
 911         //
 912         // lock down a currently playing sound
 913         //
 914 /*++++  playing = SD_SoundPlaying ();
 915         if(playing)
 916         {
 917                 switch (SoundMode)
 918                 {
 919                 case sdm_PC:
 920                         playing += STARTPCSOUNDS;
 921                         break;
 922                 case sdm_AdLib:
 923                         playing += STARTADLIBSOUNDS;
 924                         break;
 925                 }
 926                 MM_SetLock(&(memptr)audiosegs[playing],true);
 927         }
 928
 929
 930         SD_StopSound();*/
 931 //      oldborder = bordercolor;
 932 //      VW_ColorBorder (15);
 933
 934         if(beforesort)
 935                 beforesort();
 936
 937         scan = mm->mmhead;
 938
 939         last = NULL;            // shut up compiler warning
 940
 941         while(scan)
 942         {
 943                 if(scan->attributes & LOCKBIT)
 944                 {
 945                 //
 946                 // block is locked, so try to pile later blocks right after it
 947                 //
 948                         start = scan->start + scan->length;
 949                 }
 950                 else
 951                 {
 952                         if(scan->attributes & PURGEBITS)
 953                         {
 954                         //
 955                         // throw out the purgable block
 956                         //
 957                                 next = scan->next;
 958                                 MM_FreeBlock(scan, mm);
 959                                 last->next = next;
 960                                 scan = next;
 961                                 continue;
 962                         }
 963                         else
 964                         {
 965                         //
 966                         // push the non purgable block on top of the last moved block
 967                         //
 968                                 if(scan->start != start)
 969                                 {
 970                                         length = scan->length;
 971                                         source = scan->start;
 972                                         dest = start;
 973                                         while(length > 0xf00)
 974                                         {
 975                                                 movedata(source,0,dest,0,0xf00*16);
 976                                                 length -= 0xf00;
 977                                                 source += 0xf00;
 978                                                 dest += 0xf00;
 979                                         }
 980                                         movedata(source,0,dest,0,length*16);
 981
 982                                         scan->start = start;
 983                                         *(unsigned *)scan->useptr = start;
 984                                 }
 985                                 start = scan->start + scan->length;
 986                         }
 987                 }
 988
 989                 last = scan;
 990                 scan = scan->next;              // go to next block
 991         }
 992
 993         mm->mmrover = mm->mmhead;
 994
 995         if(aftersort)
 996                 aftersort();
 997
 998 //      VW_ColorBorder (oldborder);
 999
1000 /*++++  if(playing)
1001                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
1002 }
1003
1004
1005 //==========================================================================
1006
1007 //****#if 0
1008 /*
1009 =====================
1010 =
1011 = MM_ShowMemory
1012 =
1013 =====================
1014 */
1015
1016 void MM_ShowMemory(mminfo_t *mm)
1017 {
1018         mmblocktype huge *scan;
1019         unsigned color,temp;//, i;
1020         long    end,owner;
1021         char    scratch[80],str[10];
1022
1023 //****  VW_SetDefaultColors();
1024 //****  VW_SetLineWidth(40);
1025 //++++mh        temp = bufferofs;
1026 //++++mh        bufferofs = 0;
1027 //****  VW_SetScreen (0,0);
1028
1029         scan = mm->mmhead;
1030
1031         end = -1;
1032
1033 //CA_OpenDebug ();
1034
1035         while (scan)
1036         {
1037                 if(scan->attributes & PURGEBITS)
1038                         color = 5;              // dark purple = purgable
1039                 else
1040                         color = 9;              // medium blue = non purgable
1041                 if(scan->attributes & LOCKBIT)
1042                         color = 12;             // red = locked
1043                 if(scan->start<=end)
1044                 {
1045                         printf("MM_ShowMemory: Memory block order currupted!");
1046                         return;
1047                 }
1048                 end = scan->start+scan->length-1;
1049 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1050 //++++          VW_Plot(scan->start,0,15);
1051                 if(scan->next->start > end+1)
1052 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1053
1054 //****#if 0
1055 printf("Location:");
1056 printf("%x\t", scan->start);
1057 strcpy (scratch,"Size:");
1058 ltoa ((dword)scan->length*16,str,10);
1059 strcat (scratch,str);
1060 strcat (scratch,"\tOwner:0x");
1061 owner = (unsigned)scan->useptr;
1062 ultoa (owner,str,16);
1063 strcat (scratch,str);
1064 strcat (scratch,"\n");
1065 //++++write (debughandle,scratch,strlen(scratch));
1066 fprintf(stdout, "%s", scratch);
1067 //****#endif
1068
1069                 scan = scan->next;
1070         }
1071
1072 //CA_CloseDebug ();
1073
1074 //++++mh        IN_Ack();
1075 //****  VW_SetLineWidth(64);
1076 //++++mh        bufferofs = temp;
1077 }
1078 //****#endif
1079
1080 //==========================================================================
1081
1082
1083 /*
1084 ======================
1085 =
1086 = MM_UnusedMemory
1087 =
1088 = Returns the total free space without purging
1089 =
1090 ======================
1091 */
1092
1093 dword MM_UnusedMemory(mminfo_t *mm)
1094 {
1095         dword free;
1096         mmblocktype huge *scan;
1097
1098         free = 0;
1099         scan = mm->mmhead;
1100
1101         while(scan->next)
1102         {
1103                 free += scan->next->start - (scan->start + scan->length);
1104                 scan = scan->next;
1105         }
1106
1107         return free*16l;
1108 //      return free;
1109 }
1110
1111 //==========================================================================
1112
1113
1114 /*
1115 ======================
1116 =
1117 = MM_TotalFree
1118 =
1119 = Returns the total free space with purging
1120 =
1121 ======================
1122 */
1123
1124 dword MM_TotalFree(mminfo_t *mm)
1125 {
1126         dword free;
1127         mmblocktype huge *scan;
1128
1129         free = 0;
1130         scan = mm->mmhead;
1131
1132         while(scan->next)
1133         {
1134                 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1135                         free += scan->length;
1136                 free += scan->next->start - (scan->start + scan->length);
1137                 scan = scan->next;
1138         }
1139
1140         return free*16l;
1141 //      return free;
1142 }
1143
1144 //==========================================================================
1145
1146 /*
1147 =====================
1148 =
1149 = MM_Report
1150 =
1151 =====================
1152 */
1153
1154 void MM_Report(mminfo_t *mm, mminfotype *mmi)
1155 {
1156         if(MML_CheckForEMS())
1157         {
1158                 printf("EMM %x available\n", mm->EMSVer);
1159                 printf("totalEMSpages=%u\n", mm->totalEMSpages);
1160                 printf("freeEMSpages=%u\n", mm->freeEMSpages);
1161                 printf("EMSpageframe=%x\n", mm->EMSpageframe);
1162         }
1163         if(MML_CheckForXMS(mm)) printf("XMSaddr=%Fp\n", *XMSaddr);
1164         printf("near=%lu\n", mmi->nearheap);
1165         printf("far=%lu\n", mmi->farheap);
1166         printf("EMSmem=%lu\n", mmi->EMSmem);
1167         printf("XMSmem=%lu\n", mmi->XMSmem);
1168         printf("mainmem=%lu\n", mmi->mainmem);
1169         printf("UnusedMemory=%lu\n", MM_UnusedMemory(mm));
1170         printf("TotalFree=%lu\n", MM_TotalFree(mm));
1171 //      printf("\n");
1172 //      printf("UnusedMemory=%lu kb\n", MM_UnusedMemory()/10248);
1173 //      printf("TotalFree=%lu kb\n", MM_TotalFree()/10248);
1174 }
1175
1176 //==========================================================================
1177
1178 /*
1179 =====================
1180 =
1181 = MM_EMSVer
1182 =
1183 =====================
1184
1185
1186 int MM_EMSVer(void)
1187 {
1188         int EMSver;
1189         __asm
1190         {
1191                 mov             ah,EMS_VERSION
1192                 int             EMS_INT
1193                 mov             EMSver,ax
1194         }
1195         return(EMSver);
1196 }*/
1197
1198 //==========================================================================
1199
1200 /*
1201 =====================
1202 =
1203 = MM_BombOnError
1204 =
1205 =====================
1206 */
1207
1208 void MM_BombOnError(boolean bomb, mminfo_t *mm)
1209 {
1210         mm->bombonerror = bomb;
1211 }
1212
1213 void MM_GetNewBlock(mminfo_t *mm)
1214 {
1215         if(!mm->mmfree)
1216                 MML_ClearBlock(mm);
1217         mm->mmnew=mm->mmfree;
1218         mm->mmfree=mm->mmfree->next;
1219         /*if(!(mm->mmnew=mm->mmfree))
1220         {
1221                 printf("MM_GETNEWBLOCK: No free blocks!");
1222                 return;
1223         }
1224         mm->mmfree=mm->mmfree->next;*/
1225 }
1226
1227 void MM_FreeBlock(mmblocktype *x, mminfo_t *mm)
1228 {
1229         x->useptr=NULL;
1230         x->next=mm->mmfree;
1231         mm->mmfree=x;
1232 }