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 #include "src/lib/16_mm.h"
  46
  47 /*
  48 =============================================================================
  49
  50                                                  GLOBAL VARIABLES
  51
  52 =============================================================================
  53 */
  54
  55 //mminfo_t      mminfo;
  56 //memptr                bufferseg;
  57 //boolean               mmerror;
  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 //boolean               mmstarted;
  72
  73 //void far      *farheap;
  74 //void          *nearheap;
  75
  76 //mmblocktype   far mmblocks[MAXBLOCKS],far *mmhead,far *mmfree,far *mmrover,far *mmnew;
  77
  78 //boolean               bombonerror;
  79
  80 //unsigned      totalEMSpages,freeEMSpages,EMSpageframe,EMSpagesmapped,EMShandle;
  81 //unsigned int EMSVer;
  82
  83 //void          (* XMSaddr) (void);             // far pointer to XMS driver
  84
  85 //unsigned      numUMBs,UMBbase[MAXUMBS];
  86
  87 static  char *ParmStringsexmm[] = {"noems","noxms",""};
  88
  89 /*
  90 ======================
  91 =
  92 = MML_CheckForEMS
  93 =
  94 = Routine from p36 of Extending DOS
  95 =
  96 =======================
  97 */
  98
  99 boolean MML_CheckForEMS(void)
 100 {
 101         boolean emmcfems;
 102         char    emmname[] = "EMMXXXX0";
 103 //              mov     dx,OFFSET emmname
 104         __asm {
 105                 LEA     DX, emmname     //fix by andrius4669
 106                 mov     ax,0x3d00
 107                 int     0x21            // try to open EMMXXXX0 device
 108                 jc      error
 109
 110                 mov     bx,ax
 111                 mov     ax,0x4400
 112
 113                 int     0x21            // get device info
 114                 jc      error
 115
 116                 and     dx,0x80
 117                 jz      error
 118
 119                 mov     ax,0x4407
 120
 121                 int     0x21            // get status
 122                 jc      error
 123                 or      al,al
 124                 jz      error
 125
 126                 mov     ah,0x3e
 127                 int     0x21            // close handle
 128                 jc      error
 129                 //
 130                 // EMS is good
 131                 //
 132                 mov     emmcfems,1
 133                 jmp End
 134                 error:
 135                 //
 136                 // EMS is bad
 137                 //
 138                 mov     emmcfems,0
 139                 End:
 140         }
 141         return(emmcfems);
 142 }
 143
 144
 145 /*
 146 ======================
 147 =
 148 = MML_SetupEMS
 149 =
 150 =======================
 151 */
 152
 153 unsigned MML_SetupEMS(mminfo_t *mm)
 154 {
 155         char    str[80],str2[10];
 156         unsigned        err;
 157         boolean errorflag=false;
 158         union REGS CPURegs;
 159
 160         unsigned int EMSVer = 0;
 161         unsigned        totalEMSpages,freeEMSpages,EMSpageframe,EMSpagesmapped,EMShandle;
 162         totalEMSpages = freeEMSpages = EMSpageframe = EMSpagesmapped = 0;
 163
 164         __asm
 165                 {
 166                 mov     ah,EMS_STATUS
 167                 int     EMS_INT                                         // make sure EMS hardware is present
 168                 or      ah,ah
 169                 jnz     error
 170
 171                 mov     ah,EMS_VERSION
 172                 int     EMS_INT
 173                 or      ah,ah
 174                 jnz     error
 175                 mov     [EMSVer],ax                             //      set EMSVer
 176                 cmp     al,0x32                                         // only work on ems 3.2 or greater
 177                 jb      error
 178
 179                 mov     ah,EMS_GETFRAME
 180                 int     EMS_INT                                         // find the page frame address
 181                 or      ah,ah
 182                 jnz     error
 183                 mov     [EMSpageframe],bx
 184
 185                 mov     ah,EMS_GETPAGES
 186                 int     EMS_INT                                         // find out how much EMS is there
 187                 or      ah,ah
 188                 jnz     error
 189                 mov     [totalEMSpages],dx
 190                 mov     [freeEMSpages],bx
 191                 or      bx,bx
 192                 jz      noEMS                                           // no EMS at all to allocate
 193
 194                 cmp     bx,4
 195                 jle     getpages                                        // there is only 1,2,3,or 4 pages
 196                 mov     bx,4                                            // we can't use more than 4 pages
 197
 198 getpages:
 199                 mov     [EMSpagesmapped],bx
 200                 mov     ah,EMS_ALLOCPAGES                       // allocate up to 64k of EMS
 201                 int     EMS_INT
 202                 or      ah,ah
 203                 jnz     error
 204                 mov     [EMShandle],dx
 205                 jmp End
 206 error:
 207                 mov     errorflag,1
 208                 jmp End
 209 noEMS:
 210 End:
 211         }
 212         if(errorflag==true)
 213         {
 214                 err = CPURegs.h.ah;
 215                 strcpy(str,"MML_SetupEMS: EMS error 0x");
 216                 itoa(err,str2,16);
 217                 strcpy(str,str2);
 218                 printf("%s\n",str);
 219                 return err;
 220         }
 221         mm->totalEMSpages=totalEMSpages;
 222         mm->freeEMSpages=freeEMSpages;
 223         mm->EMSpageframe=EMSpageframe;
 224         mm->EMSpagesmapped=EMSpagesmapped;
 225         mm->EMShandle=EMShandle;
 226         mm->EMSVer=EMSVer;
 227         return 0;
 228 }
 229
 230
 231 /*
 232 ======================
 233 =
 234 = MML_ShutdownEMS
 235 =
 236 =======================
 237 */
 238
 239 void MML_ShutdownEMS(mminfo_t *mm)
 240 {
 241         boolean errorflag=false;
 242         unsigned EMShandle=mm->EMShandle;
 243
 244         if(!EMShandle)
 245                 return;
 246         __asm
 247         {
 248                 mov     ah,EMS_FREEPAGES
 249                 mov     dx,[EMShandle]
 250                 int     EMS_INT
 251                 or      ah,ah
 252                 jz      ok
 253                 mov     errorflag,1
 254                 ok:
 255         }
 256         if(errorflag==true) printf("MML_ShutdownEMS: Error freeing EMS!");      //++++ add something
 257 }
 258
 259 /*
 260 ====================
 261 =
 262 = MM_MapEMS
 263 =
 264 = Maps the 64k of EMS used by memory manager into the page frame
 265 = for general use.  This only needs to be called if you are keeping
 266 = other things in EMS.
 267 =
 268 ====================
 269 */
 270
 271 unsigned MM_MapEMS(mminfo_t *mm)
 272 {
 273         char    str[80],str2[10];
 274         unsigned        err, EMShandle;
 275         boolean errorflag=false;
 276         int     i;
 277         union REGS CPURegs;
 278         EMShandle=mm->EMShandle;
 279
 280         for (i=0;i<mm->EMSpagesmapped;i++)
 281         {
 282                 __asm
 283                 {
 284                         mov     ah,EMS_MAPPAGE
 285                         mov     bx,[i]                  // logical page
 286                         mov     al,bl                   // physical page
 287                         mov     dx,[EMShandle]  // handle
 288                         int     EMS_INT
 289                         or      ah,ah
 290                         jnz     error
 291                         jmp End
 292                         error:
 293                         mov     errorflag,1
 294                         End:
 295                 }
 296                 if(errorflag==true)
 297                 {
 298                         err = CPURegs.h.ah;
 299                         strcpy(str,"MM_MapEMS: EMS error 0x");
 300                         itoa(err,str2,16);
 301                         strcpy(str,str2);
 302                         printf("%s\n",str);
 303                         return err;
 304                 }
 305         }
 306         return 0;
 307 }
 308
 309 //==========================================================================
 310
 311 /*
 312 ======================
 313 =
 314 = MML_CheckForXMS
 315 =
 316 = Check for XMM driver
 317 =
 318 =======================
 319 */
 320
 321 boolean MML_CheckForXMS(mminfo_t *mm)
 322 {
 323         boolean errorflag=false;
 324         mm->numUMBs = 0;
 325
 326         __asm
 327         {
 328                 mov     ax,0x4300
 329                 int     0x2f                            // query status of installed diver
 330                 cmp     al,0x80
 331                 je      good
 332                 mov     errorflag,1
 333                 good:
 334         }
 335         if(errorflag==true) return false;
 336         else return true;
 337 }
 338
 339
 340 /*
 341 ======================
 342 =
 343 = MML_SetupXMS
 344 =
 345 = Try to allocate all upper memory block
 346 =
 347 =======================
 348 */
 349
 350 void MML_SetupXMS(mminfo_t *mm, mminfotype *mmi)
 351 {
 352         unsigned        base,size;
 353
 354         __asm
 355         {
 356                 mov     ax,0x4310
 357                 int     0x2f
 358                 mov     [WORD PTR XMSaddr],bx
 359                 mov     [WORD PTR XMSaddr+2],es         // function pointer to XMS driver
 360         }
 361 getmemory:
 362         __asm
 363         {
 364                 mov     ah,XMS_ALLOCUMB
 365                 mov     dx,0xffff                                       // try for largest block possible
 366                 call    [DWORD PTR XMSaddr]
 367                 or      ax,ax
 368                 jnz     gotone
 369
 370                 cmp     bl,0xb0                                         // error: smaller UMB is available
 371                 jne     done;
 372
 373                 mov     ah,XMS_ALLOCUMB
 374                 call    [DWORD PTR XMSaddr]             // DX holds largest available UMB
 375                 or      ax,ax
 376                 jz      done                                            // another error...
 377
 378 gotone:
 379                 mov     [base],bx
 380                 mov     [size],dx
 381 done:
 382         }
 383         MML_UseSpace(base,size, mm);
 384         mmi->XMSmem += size*16;
 385         mm->UMBbase[mm->numUMBs] = base;
 386         mm->numUMBs++;
 387         if(mm->numUMBs < MAXUMBS)
 388                 goto getmemory;
 389 }
 390
 391
 392 /*
 393 ======================
 394 =
 395 = MML_ShutdownXMS
 396 =
 397 ======================
 398 */
 399
 400 void MML_ShutdownXMS(mminfo_t *mm)
 401 {
 402         int     i;
 403         unsigned        base;
 404
 405         for (i=0;i<mm->numUMBs;i++)
 406         {
 407                 base = mm->UMBbase[i];
 408                 __asm
 409                 {
 410                         mov     ah,XMS_FREEUMB
 411                         mov     dx,[base]
 412                         call    [DWORD PTR XMSaddr]
 413                 }
 414         }
 415 }
 416
 417 //==========================================================================
 418
 419 /*
 420 ======================
 421 =
 422 = MML_UseSpace
 423 =
 424 = Marks a range of paragraphs as usable by the memory manager
 425 = This is used to mark space for the near heap, far heap, ems page frame,
 426 = and upper memory blocks
 427 =
 428 ======================
 429 */
 430
 431 void MML_UseSpace(unsigned segstart, unsigned seglength, mminfo_t *mm)
 432 {
 433         mmblocktype far *scan,far *last;
 434         unsigned        oldend;
 435         long            extra;
 436
 437         scan = last = mm->mmhead;
 438         mm->mmrover = mm->mmhead;               // reset rover to start of memory
 439
 440 //
 441 // search for the block that contains the range of segments
 442 //
 443         while(scan->start+scan->length < segstart)
 444         {
 445                 last = scan;
 446                 scan = scan->next;
 447         }
 448
 449 //
 450 // take the given range out of the block
 451 //
 452         oldend = scan->start + scan->length;
 453         extra = oldend - (segstart+seglength);
 454         if(extra < 0)
 455         {
 456                 printf("MML_UseSpace: Segment spans two blocks!");
 457                 return;
 458         }
 459
 460
 461         if(segstart == scan->start)
 462         {
 463                 last->next = scan->next;                        // unlink block
 464                 MM_FreeBlock(scan, mm);
 465                 scan = last;
 466         }
 467         else
 468                 scan->length = segstart-scan->start;    // shorten block
 469
 470         if(extra > 0)
 471         {
 472                 MM_GetNewBlock(mm);
 473                 mm->mmnew->next = scan->next;
 474                 scan->next = mm->mmnew;
 475                 mm->mmnew->start = segstart+seglength;
 476                 mm->mmnew->length = extra;
 477                 mm->mmnew->attributes = LOCKBIT;
 478         }
 479
 480 }
 481
 482 //==========================================================================
 483
 484 /*
 485 ====================
 486 =
 487 = MML_ClearBlock
 488 =
 489 = We are out of blocks, so free a purgable block
 490 =
 491 ====================
 492 */
 493
 494 void MML_ClearBlock(mminfo_t *mm)
 495 {
 496         mmblocktype far *scan,far *last;
 497
 498         scan = mm->mmhead->next;
 499
 500         while(scan)
 501         {
 502                 if(!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS))
 503                 {
 504                         MM_FreePtr(scan->useptr, mm);
 505                         return;
 506                 }
 507                 scan = scan->next;
 508         }
 509
 510         printf("MM_ClearBlock: No purgable blocks!");
 511 }
 512
 513
 514 //==========================================================================
 515
 516 /*
 517 ===================
 518 =
 519 = MM_Startup
 520 =
 521 = Grabs all space from turbo with malloc/farmalloc
 522 = Allocates bufferseg misc buffer
 523 =
 524 ===================
 525 */
 526
 527 void MM_Startup(mminfo_t *mm, mminfotype *mmi)
 528 {
 529         int i;
 530         dword length;
 531         void far        *start;
 532         unsigned        segstart,seglength,endfree;
 533
 534         if(mm->mmstarted)
 535                 MM_Shutdown(mm);
 536
 537         mm->mmstarted = true;
 538         mm->bombonerror = true;
 539 //
 540 // set up the linked list (everything in the free list;
 541 //
 542         mm->mmhead = NULL;
 543         mm->mmfree = &(mm->mmblocks[0]);
 544         for(i=0;i<MAXBLOCKS-1;i++)
 545         {
 546                 mm->mmblocks[i].next = &(mm->mmblocks[i+1]);
 547         }
 548         mm->mmblocks[i].next = NULL;
 549
 550 //
 551 // locked block of all memory until we punch out free space
 552 //
 553         MM_GetNewBlock(mm);
 554         mm->mmhead = mm->mmnew;                         // this will allways be the first node
 555         mm->mmnew->start = 0;
 556         mm->mmnew->length = 0xffff;
 557         mm->mmnew->attributes = LOCKBIT;
 558         mm->mmnew->next = NULL;
 559         mm->mmrover = mm->mmhead;
 560
 561
 562 //
 563 // get all available near conventional memory segments
 564 //
 565 //----  length=coreleft();
 566         _nheapgrow();
 567         length=_memavl();
 568         start = (void far *)(mm->nearheap = malloc(length));
 569
 570         length -= 16-(FP_OFF(start)&15);
 571         length -= SAVENEARHEAP;
 572         seglength = length / 16;                        // now in paragraphs
 573         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 574         MML_UseSpace(segstart,seglength, mm);
 575         mmi->nearheap = length;
 576
 577 //
 578 // get all available far conventional memory segments
 579 //
 580 //----  length=farcoreleft();
 581         _fheapgrow();
 582         length=_memavl();
 583         start = mm->farheap = _fmalloc(length);
 584         length -= 16-(FP_OFF(start)&15);
 585         length -= SAVEFARHEAP;
 586         seglength = length / 16;                        // now in paragraphs
 587         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 588         MML_UseSpace(segstart,seglength, mm);
 589         mmi->farheap = length;
 590         mmi->mainmem = mmi->nearheap + mmi->farheap;
 591
 592
 593 //
 594 // detect EMS and allocate up to 64K at page frame
 595 //
 596         mmi->EMSmem = 0;
 597         for(i = 1;i < __argc;i++)
 598         {
 599                 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 600                         goto emsskip;                           // param NOEMS
 601         }
 602
 603         if(MML_CheckForEMS())
 604         {
 605 //printf("EMS1\n");
 606                 MML_SetupEMS(mm);                                       // allocate space
 607                 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!
 608                 MML_UseSpace(mm->EMSpageframe,mm->EMSpagesmapped*0x400, mm);
 609 //printf("EMS3\n");
 610                 MM_MapEMS(mm);                                  // map in used pages
 611 //printf("EMS4\n");
 612                 mmi->EMSmem = mm->EMSpagesmapped*0x4000l;
 613         }
 614
 615 //
 616 // detect XMS and get upper memory blocks
 617 //
 618 emsskip:
 619         mmi->XMSmem = 0;
 620         for(i = 1;i < __argc;i++)
 621         {
 622                 if( US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 623                         goto xmsskip;                           // param NOXMS
 624         }
 625
 626         if(MML_CheckForXMS(mm))
 627         {
 628 //printf("XMS!\n");
 629                 MML_SetupXMS(mm, mmi);                                  // allocate as many UMBs as possible
 630         }
 631
 632 //
 633 // allocate the misc buffer
 634 //
 635 xmsskip:
 636         mm->mmrover = mm->mmhead;               // start looking for space after low block
 637
 638         MM_GetPtr(&(mm->bufferseg),BUFFERSIZE, mm, mmi);
 639 }
 640
 641 //==========================================================================
 642
 643 /*
 644 ====================
 645 =
 646 = MM_Shutdown
 647 =
 648 = Frees all conventional, EMS, and XMS allocated
 649 =
 650 ====================
 651 */
 652
 653 void MM_Shutdown(mminfo_t *mm)
 654 {
 655         if(!(mm->mmstarted))
 656                 return;
 657
 658         _ffree(mm->farheap);
 659         printf("far freed\n");
 660         free(mm->nearheap);
 661         printf("near freed\n");
 662         //hfree(mm->hugeheap);
 663         //printf("huge freed\n");
 664         MML_ShutdownEMS(mm);
 665         printf("EMS freed\n");
 666         MML_ShutdownXMS(mm);
 667         printf("XMS freed\n");
 668 }
 669
 670 //==========================================================================
 671
 672 /*
 673 ====================
 674 =
 675 = MM_GetPtr
 676 =
 677 = Allocates an unlocked, unpurgable block
 678 =
 679 ====================
 680 */
 681
 682 void MM_GetPtr(memptr *baseptr,dword size, mminfo_t *mm, mminfotype *mmi)
 683 {
 684         mmblocktype far *scan,far *lastscan,far *endscan
 685                                 ,far *purge,far *next;
 686         int                     search;
 687         unsigned        needed,startseg;
 688
 689         needed = (size+15)/16;          // convert size from bytes to paragraphs
 690
 691         MM_GetNewBlock(mm);                             // fill in start and next after a spot is found
 692         mm->mmnew->length = needed;
 693         mm->mmnew->useptr = baseptr;
 694         mm->mmnew->attributes = BASEATTRIBUTES;
 695
 696         for(search = 0; search<3; search++)
 697         {
 698         //
 699         // first search:        try to allocate right after the rover, then on up
 700         // second search:       search from the head pointer up to the rover
 701         // third search:        compress memory, then scan from start
 702                 if(search == 1 && mm->mmrover == mm->mmhead)
 703                         search++;
 704
 705                 switch(search)
 706                 {
 707                 case 0:
 708                         lastscan = mm->mmrover;
 709                         scan = mm->mmrover->next;
 710                         endscan = NULL;
 711                         break;
 712                 case 1:
 713                         lastscan = mm->mmhead;
 714                         scan = mm->mmhead->next;
 715                         endscan = mm->mmrover;
 716                         break;
 717                 case 2:
 718                         MM_SortMem(mm);
 719                         lastscan = mm->mmhead;
 720                         scan = mm->mmhead->next;
 721                         endscan = NULL;
 722                         break;
 723                 }
 724
 725                 startseg = lastscan->start + lastscan->length;
 726
 727                 while(scan != endscan)
 728                 {
 729                         if(scan->start - startseg >= needed)
 730                         {
 731                         //
 732                         // got enough space between the end of lastscan and
 733                         // the start of scan, so throw out anything in the middle
 734                         // and allocate the new block
 735                         //
 736                                 purge = lastscan->next;
 737                                 lastscan->next = mm->mmnew;
 738                                 mm->mmnew->start = *(unsigned *)baseptr = startseg;
 739                                 mm->mmnew->next = scan;
 740                                 while(purge != scan)
 741                                 {       // free the purgable block
 742                                         next = purge->next;
 743                                         MM_FreeBlock(purge, mm);
 744                                         purge = next;           // purge another if not at scan
 745                                 }
 746                                 mm->mmrover = mm->mmnew;
 747                                 return; // good allocation!
 748                         }
 749
 750                         //
 751                         // if this block is purge level zero or locked, skip past it
 752                         //
 753                         if((scan->attributes & LOCKBIT)
 754                                 || !(scan->attributes & PURGEBITS) )
 755                         {
 756                                 lastscan = scan;
 757                                 startseg = lastscan->start + lastscan->length;
 758                         }
 759
 760
 761                         scan=scan->next;                // look at next line
 762                 }
 763         }
 764
 765         if (mm->bombonerror)
 766                 printf(OUT_OF_MEM_MSG,(size-mmi->nearheap));
 767         else
 768                 mm->mmerror = true;
 769 }
 770
 771 //==========================================================================
 772
 773 /*
 774 ====================
 775 =
 776 = MM_FreePtr
 777 =
 778 = Allocates an unlocked, unpurgable block
 779 =
 780 ====================
 781 */
 782
 783 void MM_FreePtr(memptr *baseptr, mminfo_t *mm)
 784 {
 785         mmblocktype far *scan,far *last;
 786
 787         last = mm->mmhead;
 788         scan = last->next;
 789
 790         if(baseptr == mm->mmrover->useptr)      // removed the last allocated block
 791                 mm->mmrover = mm->mmhead;
 792
 793         while(scan->useptr != baseptr && scan)
 794         {
 795                 last = scan;
 796                 scan = scan->next;
 797         }
 798
 799         if(!scan)
 800         {
 801                 printf("MM_FreePtr: Block not found!");
 802                 return;
 803         }
 804
 805         last->next = scan->next;
 806
 807         MM_FreeBlock(scan, mm);
 808 }
 809 //==========================================================================
 810
 811 /*
 812 =====================
 813 =
 814 = MM_SetPurge
 815 =
 816 = Sets the purge level for a block (locked blocks cannot be made purgable)
 817 =
 818 =====================
 819 */
 820
 821 void MM_SetPurge(memptr *baseptr, int purge, mminfo_t *mm)
 822 {
 823         mmblocktype far *start;
 824
 825         start = mm->mmrover;
 826
 827         do
 828         {
 829                 if(mm->mmrover->useptr == baseptr)
 830                         break;
 831
 832                 mm->mmrover = mm->mmrover->next;
 833
 834                 if(!mm->mmrover)
 835                         mm->mmrover = mm->mmhead;
 836                 else if(mm->mmrover == start)
 837                 {
 838                         printf("MM_SetPurge: Block not found!");
 839                         return;
 840                 }
 841
 842         } while(1);
 843
 844         mm->mmrover->attributes &= ~PURGEBITS;
 845         mm->mmrover->attributes |= purge;
 846 }
 847
 848 //==========================================================================
 849
 850 /*
 851 =====================
 852 =
 853 = MM_SetLock
 854 =
 855 = Locks / unlocks the block
 856 =
 857 =====================
 858 */
 859
 860 void MM_SetLock(memptr *baseptr, boolean locked, mminfo_t *mm)
 861 {
 862         mmblocktype far *start;
 863
 864         start = mm->mmrover;
 865
 866         do
 867         {
 868                 if(mm->mmrover->useptr == baseptr)
 869                         break;
 870
 871                 mm->mmrover = mm->mmrover->next;
 872
 873                 if(!mm->mmrover)
 874                         mm->mmrover = mm->mmhead;
 875                 else if(mm->mmrover == start)
 876                 {
 877                         printf("MM_SetLock: Block not found!");
 878                         return;
 879                 }
 880
 881         } while(1);
 882
 883         mm->mmrover->attributes &= ~LOCKBIT;
 884         mm->mmrover->attributes |= locked*LOCKBIT;
 885 }
 886
 887 //==========================================================================
 888
 889 /*
 890 =====================
 891 =
 892 = MM_SortMem
 893 =
 894 = Throws out all purgable stuff and compresses movable blocks
 895 =
 896 =====================
 897 */
 898
 899 void MM_SortMem(mminfo_t *mm)
 900 {
 901         mmblocktype far *scan,far *last,far *next;
 902         unsigned        start,length,source,dest,oldborder;
 903         int                     playing;
 904
 905         //
 906         // lock down a currently playing sound
 907         //
 908 /*++++  playing = SD_SoundPlaying ();
 909         if(playing)
 910         {
 911                 switch (SoundMode)
 912                 {
 913                 case sdm_PC:
 914                         playing += STARTPCSOUNDS;
 915                         break;
 916                 case sdm_AdLib:
 917                         playing += STARTADLIBSOUNDS;
 918                         break;
 919                 }
 920                 MM_SetLock(&(memptr)audiosegs[playing],true);
 921         }
 922
 923
 924         SD_StopSound();*/
 925 //      oldborder = bordercolor;
 926 //      VW_ColorBorder (15);
 927
 928         if(beforesort)
 929                 beforesort();
 930
 931         scan = mm->mmhead;
 932
 933         last = NULL;            // shut up compiler warning
 934
 935         while(scan)
 936         {
 937                 if(scan->attributes & LOCKBIT)
 938                 {
 939                 //
 940                 // block is locked, so try to pile later blocks right after it
 941                 //
 942                         start = scan->start + scan->length;
 943                 }
 944                 else
 945                 {
 946                         if(scan->attributes & PURGEBITS)
 947                         {
 948                         //
 949                         // throw out the purgable block
 950                         //
 951                                 next = scan->next;
 952                                 MM_FreeBlock(scan, mm);
 953                                 last->next = next;
 954                                 scan = next;
 955                                 continue;
 956                         }
 957                         else
 958                         {
 959                         //
 960                         // push the non purgable block on top of the last moved block
 961                         //
 962                                 if(scan->start != start)
 963                                 {
 964                                         length = scan->length;
 965                                         source = scan->start;
 966                                         dest = start;
 967                                         while(length > 0xf00)
 968                                         {
 969                                                 movedata(source,0,dest,0,0xf00*16);
 970                                                 length -= 0xf00;
 971                                                 source += 0xf00;
 972                                                 dest += 0xf00;
 973                                         }
 974                                         movedata(source,0,dest,0,length*16);
 975
 976                                         scan->start = start;
 977                                         *(unsigned *)scan->useptr = start;
 978                                 }
 979                                 start = scan->start + scan->length;
 980                         }
 981                 }
 982
 983                 last = scan;
 984                 scan = scan->next;              // go to next block
 985         }
 986
 987         mm->mmrover = mm->mmhead;
 988
 989         if(aftersort)
 990                 aftersort();
 991
 992 //      VW_ColorBorder (oldborder);
 993
 994 /*++++  if(playing)
 995                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
 996 }
 997
 998
 999 //==========================================================================
1000
1001 //****#if 0
1002 /*
1003 =====================
1004 =
1005 = MM_ShowMemory
1006 =
1007 =====================
1008 */
1009
1010 void MM_ShowMemory(mminfo_t *mm)
1011 {
1012         mmblocktype far *scan;
1013         unsigned color,temp;//, i;
1014         long    end,owner;
1015         char    scratch[80],str[10];
1016
1017 //****  VW_SetDefaultColors();
1018 //****  VW_SetLineWidth(40);
1019 //++++mh        temp = bufferofs;
1020 //++++mh        bufferofs = 0;
1021 //****  VW_SetScreen (0,0);
1022
1023         scan = mm->mmhead;
1024
1025         end = -1;
1026
1027 //CA_OpenDebug ();
1028
1029         while (scan)
1030         {
1031                 if(scan->attributes & PURGEBITS)
1032                         color = 5;              // dark purple = purgable
1033                 else
1034                         color = 9;              // medium blue = non purgable
1035                 if(scan->attributes & LOCKBIT)
1036                         color = 12;             // red = locked
1037                 if(scan->start<=end)
1038                 {
1039                         printf("MM_ShowMemory: Memory block order currupted!");
1040                         return;
1041                 }
1042                 end = scan->start+scan->length-1;
1043 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1044 //++++          VW_Plot(scan->start,0,15);
1045                 if(scan->next->start > end+1)
1046 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1047
1048 //****#if 0
1049 printf("Location:");
1050 printf("%x\t", scan->start);
1051 strcpy (scratch,"Size:");
1052 ltoa ((long)scan->length*16,str,10);
1053 strcat (scratch,str);
1054 strcat (scratch,"\tOwner:0x");
1055 owner = (unsigned)scan->useptr;
1056 ultoa (owner,str,16);
1057 strcat (scratch,str);
1058 strcat (scratch,"\n");
1059 //++++write (debughandle,scratch,strlen(scratch));
1060 fprintf(stdout, "%s", scratch);
1061 //****#endif
1062
1063                 scan = scan->next;
1064         }
1065
1066 //CA_CloseDebug ();
1067
1068 //++++mh        IN_Ack();
1069 //****  VW_SetLineWidth(64);
1070 //++++mh        bufferofs = temp;
1071 }
1072 //****#endif
1073
1074 //==========================================================================
1075
1076
1077 /*
1078 ======================
1079 =
1080 = MM_UnusedMemory
1081 =
1082 = Returns the total free space without purging
1083 =
1084 ======================
1085 */
1086
1087 dword MM_UnusedMemory(mminfo_t *mm)
1088 {
1089         unsigned free;
1090         mmblocktype far *scan;
1091
1092         free = 0;
1093         scan = mm->mmhead;
1094
1095         while(scan->next)
1096         {
1097                 free += scan->next->start - (scan->start + scan->length);
1098                 scan = scan->next;
1099         }
1100
1101         return free*16l;
1102 //      return free;
1103 }
1104
1105 //==========================================================================
1106
1107
1108 /*
1109 ======================
1110 =
1111 = MM_TotalFree
1112 =
1113 = Returns the total free space with purging
1114 =
1115 ======================
1116 */
1117
1118 dword MM_TotalFree(mminfo_t *mm)
1119 {
1120         unsigned free;
1121         mmblocktype far *scan;
1122
1123         free = 0;
1124         scan = mm->mmhead;
1125
1126         while(scan->next)
1127         {
1128                 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1129                         free += scan->length;
1130                 free += scan->next->start - (scan->start + scan->length);
1131                 scan = scan->next;
1132         }
1133
1134         return free*16l;
1135 //      return free;
1136 }
1137
1138 //==========================================================================
1139
1140 /*
1141 =====================
1142 =
1143 = MM_Report
1144 =
1145 =====================
1146 */
1147
1148 void MM_Report(mminfo_t *mm, mminfotype *mmi)
1149 {
1150         printf("EMM %x available\n", mm->EMSVer);
1151         printf("totalEMSpages=%u\n", mm->totalEMSpages);
1152         printf("freeEMSpages=%u\n", mm->freeEMSpages);
1153         printf("EMSpageframe=%Fp\n", mm->EMSpageframe);
1154         printf("near=%lu\n", mmi->nearheap);
1155         printf("far=%lu\n", mmi->farheap);
1156         printf("EMSmem=%lu\n", mmi->EMSmem);
1157         printf("XMSmem=%lu\n", mmi->XMSmem);
1158         printf("mainmem=%lu\n", mmi->mainmem);
1159         printf("UnusedMemory=%lu\n", MM_UnusedMemory(mm));
1160         printf("TotalFree=%lu\n", MM_TotalFree(mm));
1161 //      printf("\n");
1162 //      printf("UnusedMemory=%lu kb\n", MM_UnusedMemory()/10248);
1163 //      printf("TotalFree=%lu kb\n", MM_TotalFree()/10248);
1164 }
1165
1166 //==========================================================================
1167
1168 /*
1169 =====================
1170 =
1171 = MM_EMSVer
1172 =
1173 =====================
1174
1175
1176 int MM_EMSVer(void)
1177 {
1178         int EMSver;
1179         __asm
1180         {
1181                 mov             ah,EMS_VERSION
1182                 int             EMS_INT
1183                 mov             EMSver,ax
1184         }
1185         return(EMSver);
1186 }*/
1187
1188 //==========================================================================
1189
1190 /*
1191 =====================
1192 =
1193 = MM_BombOnError
1194 =
1195 =====================
1196 */
1197
1198 void MM_BombOnError(boolean bomb, mminfo_t *mm)
1199 {
1200         mm->bombonerror = bomb;
1201 }
1202
1203 void MM_GetNewBlock(mminfo_t *mm)
1204 {
1205         if(!mm->mmfree)
1206                 MML_ClearBlock(mm);
1207         mm->mmnew=mm->mmfree;
1208         mm->mmfree=mm->mmfree->next;
1209         /*if(!(mm->mmnew=mm->mmfree))
1210         {
1211                 printf("MM_GETNEWBLOCK: No free blocks!");
1212                 return;
1213         }
1214         mm->mmfree=mm->mmfree->next;*/
1215 }
1216
1217 void MM_FreeBlock(mmblocktype *x, mminfo_t *mm)
1218 {
1219         x->useptr=NULL;
1220         x->next=mm->mmfree;
1221         mm->mmfree=x;
1222 }