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         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!
 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         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!
 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         if(MML_CheckForEMS()){ MML_ShutdownEMS(mm); printf("EMS freed\n"); }
 665         if(MML_CheckForXMS(mm)){ MML_ShutdownXMS(mm); printf("XMS freed\n"); }
 666 }
 667
 668 //==========================================================================
 669
 670 /*
 671 ====================
 672 =
 673 = MM_GetPtr
 674 =
 675 = Allocates an unlocked, unpurgable block
 676 =
 677 ====================
 678 */
 679
 680 void MM_GetPtr(memptr *baseptr,dword size, mminfo_t *mm, mminfotype *mmi)
 681 {
 682         mmblocktype far *scan,far *lastscan,far *endscan
 683                                 ,far *purge,far *next;
 684         int                     search;
 685         unsigned        needed,startseg;
 686
 687         needed = (size+15)/16;          // convert size from bytes to paragraphs
 688
 689         MM_GetNewBlock(mm);                             // fill in start and next after a spot is found
 690         mm->mmnew->length = needed;
 691         mm->mmnew->useptr = baseptr;
 692         mm->mmnew->attributes = BASEATTRIBUTES;
 693
 694         for(search = 0; search<3; search++)
 695         {
 696         //
 697         // first search:        try to allocate right after the rover, then on up
 698         // second search:       search from the head pointer up to the rover
 699         // third search:        compress memory, then scan from start
 700                 if(search == 1 && mm->mmrover == mm->mmhead)
 701                         search++;
 702
 703                 switch(search)
 704                 {
 705                 case 0:
 706                         lastscan = mm->mmrover;
 707                         scan = mm->mmrover->next;
 708                         endscan = NULL;
 709                         break;
 710                 case 1:
 711                         lastscan = mm->mmhead;
 712                         scan = mm->mmhead->next;
 713                         endscan = mm->mmrover;
 714                         break;
 715                 case 2:
 716                         MM_SortMem(mm);
 717                         lastscan = mm->mmhead;
 718                         scan = mm->mmhead->next;
 719                         endscan = NULL;
 720                         break;
 721                 }
 722
 723                 startseg = lastscan->start + lastscan->length;
 724
 725                 while(scan != endscan)
 726                 {
 727                         if(scan->start - startseg >= needed)
 728                         {
 729                         //
 730                         // got enough space between the end of lastscan and
 731                         // the start of scan, so throw out anything in the middle
 732                         // and allocate the new block
 733                         //
 734                                 purge = lastscan->next;
 735                                 lastscan->next = mm->mmnew;
 736                                 mm->mmnew->start = *(unsigned *)baseptr = startseg;
 737                                 mm->mmnew->next = scan;
 738                                 while(purge != scan)
 739                                 {       // free the purgable block
 740                                         next = purge->next;
 741                                         MM_FreeBlock(purge, mm);
 742                                         purge = next;           // purge another if not at scan
 743                                 }
 744                                 mm->mmrover = mm->mmnew;
 745                                 return; // good allocation!
 746                         }
 747
 748                         //
 749                         // if this block is purge level zero or locked, skip past it
 750                         //
 751                         if((scan->attributes & LOCKBIT)
 752                                 || !(scan->attributes & PURGEBITS) )
 753                         {
 754                                 lastscan = scan;
 755                                 startseg = lastscan->start + lastscan->length;
 756                         }
 757
 758
 759                         scan=scan->next;                // look at next line
 760                 }
 761         }
 762
 763         if (mm->bombonerror)
 764                 printf(OUT_OF_MEM_MSG,(size-mmi->nearheap));
 765         else
 766                 mm->mmerror = true;
 767 }
 768
 769 //==========================================================================
 770
 771 /*
 772 ====================
 773 =
 774 = MM_FreePtr
 775 =
 776 = Allocates an unlocked, unpurgable block
 777 =
 778 ====================
 779 */
 780
 781 void MM_FreePtr(memptr *baseptr, mminfo_t *mm)
 782 {
 783         mmblocktype far *scan,far *last;
 784
 785         last = mm->mmhead;
 786         scan = last->next;
 787
 788         if(baseptr == mm->mmrover->useptr)      // removed the last allocated block
 789                 mm->mmrover = mm->mmhead;
 790
 791         while(scan->useptr != baseptr && scan)
 792         {
 793                 last = scan;
 794                 scan = scan->next;
 795         }
 796
 797         if(!scan)
 798         {
 799                 printf("MM_FreePtr: Block not found!");
 800                 return;
 801         }
 802
 803         last->next = scan->next;
 804
 805         MM_FreeBlock(scan, mm);
 806 }
 807 //==========================================================================
 808
 809 /*
 810 =====================
 811 =
 812 = MM_SetPurge
 813 =
 814 = Sets the purge level for a block (locked blocks cannot be made purgable)
 815 =
 816 =====================
 817 */
 818
 819 void MM_SetPurge(memptr *baseptr, int purge, mminfo_t *mm)
 820 {
 821         mmblocktype far *start;
 822
 823         start = mm->mmrover;
 824
 825         do
 826         {
 827                 if(mm->mmrover->useptr == baseptr)
 828                         break;
 829
 830                 mm->mmrover = mm->mmrover->next;
 831
 832                 if(!mm->mmrover)
 833                         mm->mmrover = mm->mmhead;
 834                 else if(mm->mmrover == start)
 835                 {
 836                         printf("MM_SetPurge: Block not found!");
 837                         return;
 838                 }
 839
 840         } while(1);
 841
 842         mm->mmrover->attributes &= ~PURGEBITS;
 843         mm->mmrover->attributes |= purge;
 844 }
 845
 846 //==========================================================================
 847
 848 /*
 849 =====================
 850 =
 851 = MM_SetLock
 852 =
 853 = Locks / unlocks the block
 854 =
 855 =====================
 856 */
 857
 858 void MM_SetLock(memptr *baseptr, boolean locked, mminfo_t *mm)
 859 {
 860         mmblocktype far *start;
 861
 862         start = mm->mmrover;
 863
 864         do
 865         {
 866                 if(mm->mmrover->useptr == baseptr)
 867                         break;
 868
 869                 mm->mmrover = mm->mmrover->next;
 870
 871                 if(!mm->mmrover)
 872                         mm->mmrover = mm->mmhead;
 873                 else if(mm->mmrover == start)
 874                 {
 875                         printf("MM_SetLock: Block not found!");
 876                         return;
 877                 }
 878
 879         } while(1);
 880
 881         mm->mmrover->attributes &= ~LOCKBIT;
 882         mm->mmrover->attributes |= locked*LOCKBIT;
 883 }
 884
 885 //==========================================================================
 886
 887 /*
 888 =====================
 889 =
 890 = MM_SortMem
 891 =
 892 = Throws out all purgable stuff and compresses movable blocks
 893 =
 894 =====================
 895 */
 896
 897 void MM_SortMem(mminfo_t *mm)
 898 {
 899         mmblocktype far *scan,far *last,far *next;
 900         unsigned        start,length,source,dest,oldborder;
 901         int                     playing;
 902
 903         //
 904         // lock down a currently playing sound
 905         //
 906 /*++++  playing = SD_SoundPlaying ();
 907         if(playing)
 908         {
 909                 switch (SoundMode)
 910                 {
 911                 case sdm_PC:
 912                         playing += STARTPCSOUNDS;
 913                         break;
 914                 case sdm_AdLib:
 915                         playing += STARTADLIBSOUNDS;
 916                         break;
 917                 }
 918                 MM_SetLock(&(memptr)audiosegs[playing],true);
 919         }
 920
 921
 922         SD_StopSound();*/
 923 //      oldborder = bordercolor;
 924 //      VW_ColorBorder (15);
 925
 926         if(beforesort)
 927                 beforesort();
 928
 929         scan = mm->mmhead;
 930
 931         last = NULL;            // shut up compiler warning
 932
 933         while(scan)
 934         {
 935                 if(scan->attributes & LOCKBIT)
 936                 {
 937                 //
 938                 // block is locked, so try to pile later blocks right after it
 939                 //
 940                         start = scan->start + scan->length;
 941                 }
 942                 else
 943                 {
 944                         if(scan->attributes & PURGEBITS)
 945                         {
 946                         //
 947                         // throw out the purgable block
 948                         //
 949                                 next = scan->next;
 950                                 MM_FreeBlock(scan, mm);
 951                                 last->next = next;
 952                                 scan = next;
 953                                 continue;
 954                         }
 955                         else
 956                         {
 957                         //
 958                         // push the non purgable block on top of the last moved block
 959                         //
 960                                 if(scan->start != start)
 961                                 {
 962                                         length = scan->length;
 963                                         source = scan->start;
 964                                         dest = start;
 965                                         while(length > 0xf00)
 966                                         {
 967                                                 movedata(source,0,dest,0,0xf00*16);
 968                                                 length -= 0xf00;
 969                                                 source += 0xf00;
 970                                                 dest += 0xf00;
 971                                         }
 972                                         movedata(source,0,dest,0,length*16);
 973
 974                                         scan->start = start;
 975                                         *(unsigned *)scan->useptr = start;
 976                                 }
 977                                 start = scan->start + scan->length;
 978                         }
 979                 }
 980
 981                 last = scan;
 982                 scan = scan->next;              // go to next block
 983         }
 984
 985         mm->mmrover = mm->mmhead;
 986
 987         if(aftersort)
 988                 aftersort();
 989
 990 //      VW_ColorBorder (oldborder);
 991
 992 /*++++  if(playing)
 993                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
 994 }
 995
 996
 997 //==========================================================================
 998
 999 //****#if 0
1000 /*
1001 =====================
1002 =
1003 = MM_ShowMemory
1004 =
1005 =====================
1006 */
1007
1008 void MM_ShowMemory(mminfo_t *mm)
1009 {
1010         mmblocktype far *scan;
1011         unsigned color,temp;//, i;
1012         long    end,owner;
1013         char    scratch[80],str[10];
1014
1015 //****  VW_SetDefaultColors();
1016 //****  VW_SetLineWidth(40);
1017 //++++mh        temp = bufferofs;
1018 //++++mh        bufferofs = 0;
1019 //****  VW_SetScreen (0,0);
1020
1021         scan = mm->mmhead;
1022
1023         end = -1;
1024
1025 //CA_OpenDebug ();
1026
1027         while (scan)
1028         {
1029                 if(scan->attributes & PURGEBITS)
1030                         color = 5;              // dark purple = purgable
1031                 else
1032                         color = 9;              // medium blue = non purgable
1033                 if(scan->attributes & LOCKBIT)
1034                         color = 12;             // red = locked
1035                 if(scan->start<=end)
1036                 {
1037                         printf("MM_ShowMemory: Memory block order currupted!");
1038                         return;
1039                 }
1040                 end = scan->start+scan->length-1;
1041 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1042 //++++          VW_Plot(scan->start,0,15);
1043                 if(scan->next->start > end+1)
1044 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1045
1046 //****#if 0
1047 printf("Location:");
1048 printf("%x\t", scan->start);
1049 strcpy (scratch,"Size:");
1050 ltoa ((long)scan->length*16,str,10);
1051 strcat (scratch,str);
1052 strcat (scratch,"\tOwner:0x");
1053 owner = (unsigned)scan->useptr;
1054 ultoa (owner,str,16);
1055 strcat (scratch,str);
1056 strcat (scratch,"\n");
1057 //++++write (debughandle,scratch,strlen(scratch));
1058 fprintf(stdout, "%s", scratch);
1059 //****#endif
1060
1061                 scan = scan->next;
1062         }
1063
1064 //CA_CloseDebug ();
1065
1066 //++++mh        IN_Ack();
1067 //****  VW_SetLineWidth(64);
1068 //++++mh        bufferofs = temp;
1069 }
1070 //****#endif
1071
1072 //==========================================================================
1073
1074
1075 /*
1076 ======================
1077 =
1078 = MM_UnusedMemory
1079 =
1080 = Returns the total free space without purging
1081 =
1082 ======================
1083 */
1084
1085 dword MM_UnusedMemory(mminfo_t *mm)
1086 {
1087         unsigned free;
1088         mmblocktype far *scan;
1089
1090         free = 0;
1091         scan = mm->mmhead;
1092
1093         while(scan->next)
1094         {
1095                 free += scan->next->start - (scan->start + scan->length);
1096                 scan = scan->next;
1097         }
1098
1099         return free*16l;
1100 //      return free;
1101 }
1102
1103 //==========================================================================
1104
1105
1106 /*
1107 ======================
1108 =
1109 = MM_TotalFree
1110 =
1111 = Returns the total free space with purging
1112 =
1113 ======================
1114 */
1115
1116 dword MM_TotalFree(mminfo_t *mm)
1117 {
1118         unsigned free;
1119         mmblocktype far *scan;
1120
1121         free = 0;
1122         scan = mm->mmhead;
1123
1124         while(scan->next)
1125         {
1126                 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1127                         free += scan->length;
1128                 free += scan->next->start - (scan->start + scan->length);
1129                 scan = scan->next;
1130         }
1131
1132         return free*16l;
1133 //      return free;
1134 }
1135
1136 //==========================================================================
1137
1138 /*
1139 =====================
1140 =
1141 = MM_Report
1142 =
1143 =====================
1144 */
1145
1146 void MM_Report(mminfo_t *mm, mminfotype *mmi)
1147 {
1148         if(MML_CheckForEMS())
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         }
1155         printf("near=%lu\n", mmi->nearheap);
1156         printf("far=%lu\n", mmi->farheap);
1157         printf("EMSmem=%lu\n", mmi->EMSmem);
1158         printf("XMSmem=%lu\n", mmi->XMSmem);
1159         printf("mainmem=%lu\n", mmi->mainmem);
1160         printf("UnusedMemory=%lu\n", MM_UnusedMemory(mm));
1161         printf("TotalFree=%lu\n", MM_TotalFree(mm));
1162 //      printf("\n");
1163 //      printf("UnusedMemory=%lu kb\n", MM_UnusedMemory()/10248);
1164 //      printf("TotalFree=%lu kb\n", MM_TotalFree()/10248);
1165 }
1166
1167 //==========================================================================
1168
1169 /*
1170 =====================
1171 =
1172 = MM_EMSVer
1173 =
1174 =====================
1175
1176
1177 int MM_EMSVer(void)
1178 {
1179         int EMSver;
1180         __asm
1181         {
1182                 mov             ah,EMS_VERSION
1183                 int             EMS_INT
1184                 mov             EMSver,ax
1185         }
1186         return(EMSver);
1187 }*/
1188
1189 //==========================================================================
1190
1191 /*
1192 =====================
1193 =
1194 = MM_BombOnError
1195 =
1196 =====================
1197 */
1198
1199 void MM_BombOnError(boolean bomb, mminfo_t *mm)
1200 {
1201         mm->bombonerror = bomb;
1202 }
1203
1204 void MM_GetNewBlock(mminfo_t *mm)
1205 {
1206         if(!mm->mmfree)
1207                 MML_ClearBlock(mm);
1208         mm->mmnew=mm->mmfree;
1209         mm->mmfree=mm->mmfree->next;
1210         /*if(!(mm->mmnew=mm->mmfree))
1211         {
1212                 printf("MM_GETNEWBLOCK: No free blocks!");
1213                 return;
1214         }
1215         mm->mmfree=mm->mmfree->next;*/
1216 }
1217
1218 void MM_FreeBlock(mmblocktype *x, mminfo_t *mm)
1219 {
1220         x->useptr=NULL;
1221         x->next=mm->mmfree;
1222         mm->mmfree=x;
1223 }