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         static char     emmname[] = "EMMXXXX0"; //fix by andrius4669
  87 //              mov     dx,OFFSET emmname
  88         __asm {
  89                 //LEA   DX, emmname     //fix by andrius4669
  90                 mov     dx,OFFSET emmname       //fix by andrius4669
  91                 mov     ax,0x3d00
  92                 int     0x21            // try to open EMMXXXX0 device
  93                 jc      error
  94
  95                 mov     bx,ax
  96                 mov     ax,0x4400
  97
  98                 int     0x21            // get device info
  99                 jc      error
 100
 101                 and     dx,0x80
 102                 jz      error
 103
 104                 mov     ax,0x4407
 105
 106                 int     0x21            // get status
 107                 jc      error
 108                 or      al,al
 109                 jz      error
 110
 111                 mov     ah,0x3e
 112                 int     0x21            // close handle
 113                 jc      error
 114                 //
 115                 // EMS is good
 116                 //
 117                 mov     emmcfems,1
 118                 jmp End
 119                 error:
 120                 //
 121                 // EMS is bad
 122                 //
 123                 mov     emmcfems,0
 124                 End:
 125         }
 126         return(emmcfems);
 127 }
 128
 129
 130 /*
 131 ======================
 132 =
 133 = MML_SetupEMS
 134 =
 135 =======================
 136 */
 137
 138 unsigned MML_SetupEMS(mminfo_t *mm)
 139 {
 140         char    str[80],str2[10];
 141         unsigned        err;
 142         boolean errorflag=false;
 143         union REGS CPURegs;
 144
 145         unsigned int EMSVer = 0;
 146         unsigned        totalEMSpages,freeEMSpages,EMSpageframe,EMSpagesmapped,EMShandle;
 147         totalEMSpages = freeEMSpages = EMSpageframe = EMSpagesmapped = 0;
 148
 149         __asm
 150                 {
 151                 mov     ah,EMS_STATUS
 152                 int     EMS_INT                                         // make sure EMS hardware is present
 153                 or      ah,ah
 154                 jnz     error
 155
 156                 mov     ah,EMS_VERSION
 157                 int     EMS_INT
 158                 or      ah,ah
 159                 jnz     error
 160                 mov     [EMSVer],ax                             //      set EMSVer
 161                 cmp     al,0x32                                         // only work on ems 3.2 or greater
 162                 jb      error
 163
 164                 mov     ah,EMS_GETFRAME
 165                 int     EMS_INT                                         // find the page frame address
 166                 or      ah,ah
 167                 jnz     error
 168                 mov     [EMSpageframe],bx
 169
 170                 mov     ah,EMS_GETPAGES
 171                 int     EMS_INT                                         // find out how much EMS is there
 172                 or      ah,ah
 173                 jnz     error
 174                 mov     [totalEMSpages],dx
 175                 mov     [freeEMSpages],bx
 176                 or      bx,bx
 177                 jz      noEMS                                           // no EMS at all to allocate
 178                                                                                         //EXPAND DONG!!!!
 179                 cmp     [EMSVer],0x40
 180                 jb      low
 181                 cmp     bx,[freeEMSpages]
 182                 jle     getpages
 183                 mov     bx,[freeEMSpages]
 184                 jmp     getpages
 185
 186 low:
 187                 cmp     bx,4
 188                 jle     getpages                                        // there is only 1,2,3,or 4 pages
 189                 mov     bx,4                                            // we can't use more than 4 pages
 190
 191 getpages:
 192                 mov     [EMSpagesmapped],bx
 193                 mov     ah,EMS_ALLOCPAGES                       // allocate up to 64k of EMS
 194                 int     EMS_INT
 195                 or      ah,ah
 196                 jnz     error
 197                 mov     [EMShandle],dx
 198                 jmp End
 199 error:
 200                 mov     errorflag,1
 201                 jmp End
 202 noEMS:
 203 End:
 204         }
 205         if(errorflag==true)
 206         {
 207                 err = CPURegs.h.ah;
 208                 strcpy(str,"MML_SetupEMS: EMS error 0x");
 209                 itoa(err,str2,16);
 210                 strcpy(str,str2);
 211                 printf("%s\n",str);
 212                 return err;
 213         }
 214         mm->totalEMSpages=totalEMSpages;
 215         mm->freeEMSpages=freeEMSpages;
 216         mm->EMSpageframe=EMSpageframe;
 217         mm->EMSpagesmapped=EMSpagesmapped;
 218         mm->EMShandle=EMShandle;
 219         mm->EMSVer=EMSVer;
 220         return 0;
 221 }
 222
 223
 224 /*
 225 ======================
 226 =
 227 = MML_ShutdownEMS
 228 =
 229 =======================
 230 */
 231
 232 void MML_ShutdownEMS(mminfo_t *mm)
 233 {
 234         boolean errorflag=false;
 235         unsigned EMShandle=mm->EMShandle;
 236
 237         if(!EMShandle)
 238                 return;
 239         __asm
 240         {
 241                 mov     ah,EMS_FREEPAGES
 242                 mov     dx,[EMShandle]
 243                 int     EMS_INT
 244                 or      ah,ah
 245                 jz      ok
 246                 mov     errorflag,1
 247                 ok:
 248         }
 249         if(errorflag==true) printf("MML_ShutdownEMS: Error freeing EMS!");      //++++ add something
 250 }
 251
 252 /*
 253 ====================
 254 =
 255 = MM_MapEMS
 256 =
 257 = Maps the 64k of EMS used by memory manager into the page frame
 258 = for general use.  This only needs to be called if you are keeping
 259 = other things in EMS.
 260 =
 261 ====================
 262 */
 263
 264 unsigned MM_MapEMS(mminfo_t *mm)
 265 {
 266         char    str[80],str2[10];
 267         unsigned        err, EMShandle;
 268         boolean errorflag=false;
 269         int     i;
 270         union REGS CPURegs;
 271         EMShandle=mm->EMShandle;
 272
 273         for (i=0;i<4/*mm->EMSpagesmapped*/;i++)
 274         {
 275                 __asm
 276                 {
 277                         mov     ah,EMS_MAPPAGE
 278                         mov     bx,[i]                  // logical page
 279                         mov     al,bl                   // physical page
 280                         mov     dx,[EMShandle]  // handle
 281                         int     EMS_INT
 282                         or      ah,ah
 283                         jnz     error
 284                         jmp End
 285                         error:
 286                         mov     errorflag,1
 287                         End:
 288                 }
 289                 if(errorflag==true)
 290                 {
 291                         err = CPURegs.h.ah;
 292                         strcpy(str,"MM_MapEMS: EMS error 0x");
 293                         itoa(err,str2,16);
 294                         strcpy(str,str2);
 295                         //printf("%s\n",str);
 296                         printf("FACK! %u\n", err);
 297                         return err;
 298                 }
 299         }
 300         return 0;
 301 }
 302
 303 /*
 304 SUB EMS.MapXPages (PhysicalStart, LogicalStart, NumPages, Handle)\r
 305 \r
 306   'Maps up to 4 logical EMS pages to physical pages in the page frame, where:\r
 307   '\r
 308   'PhysicalStart = Physical page first logical page is mapped to\r
 309   'LogicalStart  = First logical page to map\r
 310   'NumPages      = Number of pages to map (1 to 4)\r
 311   'Handle        = EMS handle logical pages are allocated to\r
 312 \r
 313   'Create a buffer containing the page information\r
 314   FOR x = 0 TO NumPages - 1\r
 315     MapInfo$ = MapInfo$ + MKI$(LogicalStart + x) + MKI$(PhysicalStart + x)\r
 316   NEXT\r
 317 \r
 318   Regs.ax = &H5000                           'Map the pages in the buffer\r
 319   Regs.cx = NumPages                         'to the pageframe\r
 320   Regs.dx = Handle\r
 321   Regs.ds = VARSEG(MapInfo$)\r
 322   Regs.si = SADD(MapInfo$)\r
 323   InterruptX &H67, Regs, Regs\r
 324   EMS.Error = (Regs.ax AND &HFF00&) \ &H100  'Store the status code\r
 325 \r
 326 END SUB
 327 */
 328 void MM_MapXEMS(mminfo_t *mm)
 329 {
 330
 331 }
 332
 333 //==========================================================================
 334
 335 /*
 336 ======================
 337 =
 338 = MML_CheckForXMS
 339 =
 340 = Check for XMM driver
 341 =
 342 =======================
 343 */
 344
 345 boolean MML_CheckForXMS(mminfo_t *mm)
 346 {
 347         boolean errorflag=false;
 348         mm->numUMBs = 0;
 349
 350         __asm
 351         {
 352                 mov     ax,0x4300
 353                 int     0x2f                            // query status of installed diver
 354                 cmp     al,0x80
 355                 je      good
 356                 mov     errorflag,1
 357                 good:
 358         }
 359         if(errorflag==true) return false;
 360         else return true;
 361 }
 362
 363
 364 /*
 365 ======================
 366 =
 367 = MML_SetupXMS
 368 =
 369 = Try to allocate all upper memory block
 370 =
 371 =======================
 372 */
 373
 374 void MML_SetupXMS(mminfo_t *mm, mminfotype *mmi)
 375 {
 376         unsigned        base,size;
 377
 378 getmemory:
 379         __asm
 380         {
 381                 mov     ax,0x4310
 382                 int     0x2f
 383                 mov     [WORD PTR XMSaddr],bx
 384                 mov     [WORD PTR XMSaddr+2],es         // function pointer to XMS driver
 385
 386                 mov     ah,XMS_ALLOCUMB
 387                 mov     dx,0xffff                                       // try for largest block possible
 388                 //mov     ax,dx                                         // Set available Kbytes.
 389                 call    [DWORD PTR XMSaddr]
 390                 or      ax,ax
 391                 jnz     gotone
 392
 393                 cmp     bl,0xb0                                         // error: smaller UMB is available
 394                 jne     done;
 395
 396                 mov     ah,XMS_ALLOCUMB
 397                 call    [DWORD PTR XMSaddr]             // DX holds largest available UMB
 398                 or      ax,ax
 399                 jz      done                                            // another error...
 400
 401 gotone:
 402                 mov     [base],bx
 403                 mov     [size],dx
 404 done:
 405         }
 406         printf("base=%u ", base); printf("size=%u\n", size);
 407         MML_UseSpace(base,size, mm);
 408         mmi->XMSmem += size*16;
 409         mm->UMBbase[mm->numUMBs] = base;
 410         mm->numUMBs++;
 411         if(mm->numUMBs < MAXUMBS)
 412                 goto getmemory;
 413 }
 414
 415
 416 /*
 417 ======================
 418 =
 419 = MML_ShutdownXMS
 420 =
 421 ======================
 422 */
 423
 424 void MML_ShutdownXMS(mminfo_t *mm)
 425 {
 426         int     i;
 427         unsigned        base;
 428
 429         for (i=0;i<mm->numUMBs;i++)
 430         {
 431                 base = mm->UMBbase[i];
 432                 __asm
 433                 {
 434                         mov     ah,XMS_FREEUMB
 435                         mov     dx,[base]
 436                         call    [DWORD PTR XMSaddr]
 437                 }
 438         }
 439 }
 440
 441 //==========================================================================
 442
 443 /*
 444 ======================
 445 =
 446 = MML_UseSpace
 447 =
 448 = Marks a range of paragraphs as usable by the memory manager
 449 = This is used to mark space for the near heap, far heap, ems page frame,
 450 = and upper memory blocks
 451 =
 452 ======================
 453 */
 454
 455 void MML_UseSpace(/*d*/word segstart, dword seglength, mminfo_t *mm)
 456 {
 457         mmblocktype huge *scan,huge *last;
 458         word            segm;
 459         dword   oldend;
 460         dword           extra;
 461
 462         scan = last = mm->mmhead;
 463         mm->mmrover = mm->mmhead;               // reset rover to start of memory
 464
 465 //
 466 // search for the block that contains the range of segments
 467 //
 468         while(scan->start+scan->length < segstart)
 469         {
 470                 last = scan;
 471                 scan = scan->next;
 472         }
 473
 474         //find out how many blocks it spans!
 475         if(seglength>0xffffu)
 476         {
 477 //              segm=seglength/0x4000u;
 478                 segm=seglength/0xffffu;
 479         }
 480         else segm=1;
 481
 482         //++++emsver stuff!
 483         if(segm>1/*extra>0xfffflu*/)
 484         {
 485                 /*__asm
 486                 {
 487                         push    ds
 488                         mov     ax,ds
 489                         inc             ax
 490                         mov     ds,ax
 491                 }*/
 492
 493
 494 //MML_UseSpace(?segstart?, ?length?, mm);
 495
 496                 /*__asm
 497                 {
 498                         pop ds
 499                 }*/
 500                 //printf("MML_UseSpace: Segment spans two blocks!\n");
 501         }
 502
 503 //
 504 // take the given range out of the block
 505 //
 506         oldend = scan->start + scan->length;
 507         extra = oldend - (segstart+seglength);
 508
 509 printf("segm=%u ", segm);
 510 printf("ex=%lu  ", extra);
 511 printf("start+seglen=%lu        ", segstart+seglength);
 512 printf("len=%u  ", scan->length);
 513 printf("segsta=%x       ", segstart);
 514 printf("seglen=%lu\n", seglength);
 515
 516 //segu:
 517 //++++todo: linked list of segment!
 518 //printf("segm=%lu\n", segm);
 519         if(segstart == scan->start)
 520         {
 521                 last->next = scan->next;                        // unlink block
 522                 MM_FreeBlock(scan, mm);
 523                 scan = last;
 524         }
 525         else
 526                 scan->length = segstart-scan->start;    // shorten block
 527
 528 //      segm--;
 529
 530         if(extra > 0)
 531         {
 532                 MM_GetNewBlock(mm);
 533                 mm->mmnew->next = scan->next;
 534                 scan->next = mm->mmnew;
 535                 mm->mmnew->start = segstart+seglength;
 536                 mm->mmnew->length = extra;
 537                 mm->mmnew->attributes = LOCKBIT;
 538         }//else if(segm>0) goto segu;
 539
 540 }
 541
 542 //==========================================================================
 543
 544 /*
 545 ====================
 546 =
 547 = MML_ClearBlock
 548 =
 549 = We are out of blocks, so free a purgable block
 550 =
 551 ====================
 552 */
 553
 554 void MML_ClearBlock(mminfo_t *mm)
 555 {
 556         mmblocktype huge *scan,huge *last;
 557
 558         scan = mm->mmhead->next;
 559
 560         while(scan)
 561         {
 562                 if(!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS))
 563                 {
 564                         MM_FreePtr(scan->useptr, mm);
 565                         return;
 566                 }
 567                 scan = scan->next;
 568         }
 569
 570         printf("MM_ClearBlock: No purgable blocks!\n");
 571 }
 572
 573
 574 //==========================================================================
 575
 576 /*
 577 ===================
 578 =
 579 = MM_Startup
 580 =
 581 = Grabs all space from turbo with malloc/farmalloc
 582 = Allocates bufferseg misc buffer
 583 =
 584 ===================
 585 */
 586
 587 void MM_Startup(mminfo_t *mm, mminfotype *mmi)
 588 {
 589         int i;
 590         dword length;
 591         void huge       *start;
 592         unsigned        segstart,seglength,endfree;
 593
 594         if(mm->mmstarted)
 595                 MM_Shutdown(mm);
 596
 597         mm->mmstarted = true;
 598         mm->bombonerror = true;
 599 //
 600 // set up the linked list (everything in the free list;
 601 //
 602         mm->mmhead = NULL;
 603         mm->mmfree = &(mm->mmblocks[0]);
 604         for(i=0;i<MAXBLOCKS-1;i++)
 605         {
 606                 mm->mmblocks[i].next = &(mm->mmblocks[i+1]);
 607         }
 608         mm->mmblocks[i].next = NULL;
 609
 610 //
 611 // locked block of all memory until we punch out free space
 612 //
 613         MM_GetNewBlock(mm);
 614         mm->mmhead = mm->mmnew;                         // this will allways be the first node
 615         mm->mmnew->start = 0;
 616         mm->mmnew->length = 0xffff;
 617         mm->mmnew->attributes = LOCKBIT;
 618         mm->mmnew->next = NULL;
 619         mm->mmrover = mm->mmhead;
 620
 621 //      farlen=_bios_memsize()*1024;
 622
 623 //
 624 // get all available near conventional memory segments
 625 //
 626 //----  length=coreleft();
 627         _nheapgrow();
 628         length=_memavl();
 629         start = (void huge *)(mm->nearheap = malloc(length));
 630         length -= 16-(FP_OFF(start)&15);
 631         length -= SAVENEARHEAP;
 632         seglength = length / 16;                        // now in paragraphs
 633         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 634         MML_UseSpace(segstart,seglength, mm);
 635         mmi->nearheap = length;
 636         //printf("near heap ok!\n");
 637
 638 //
 639 // get all available far conventional memory segments
 640 //
 641 //----  length=farcoreleft();
 642         _fheapgrow();
 643         length=_memavl();
 644         start = mm->farheap = halloc(length, sizeof(byte));
 645         //start = mm->farheap = _fmalloc(length);
 646         length -= 16-(FP_OFF(start)&15);
 647         length -= SAVEFARHEAP;
 648         seglength = length / 16;                        // now in paragraphs
 649         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 650         MML_UseSpace(segstart,seglength, mm);
 651         mmi->farheap = length;
 652         mmi->mainmem = mmi->nearheap + mmi->farheap;
 653         //printf("far heap ok!\n");
 654
 655
 656 //
 657 // detect EMS and allocate up to 64K at page frame
 658 //
 659         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!
 660         mmi->EMSmem = 0;
 661         for(i = 1;i < __argc;i++)
 662         {
 663                 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 664                         goto emsskip;                           // param NOEMS
 665         }
 666         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!
 667         if(MML_CheckForEMS())
 668         {
 669 //printf("EMS1\n");
 670                 MML_SetupEMS(mm);                                       // allocate space
 671                 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!
 672                 //TODO: EMS4! AND EMS 3.2 MASSIVE DATA HANDLMENT!
 673                 MML_UseSpace(mm->EMSpageframe,(MAPPAGES)*0x4000lu, mm);
 674 //printf("EMS3\n");
 675                 MM_MapEMS(mm);                                  // map in used pages
 676 //printf("EMS4\n");
 677                 mmi->EMSmem = (MAPPAGES)*0x4000lu;
 678         }
 679
 680 //
 681 // detect XMS and get upper memory blocks
 682 //
 683 emsskip:
 684         mmi->XMSmem = 0;
 685         for(i = 1;i < __argc;i++)
 686         {
 687                 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 688                         goto xmsskip;                           // param NOXMS
 689         }
 690         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!
 691         if(MML_CheckForXMS(mm))
 692         {
 693                 printf("XMS!\n");
 694                 //MML_SetupXMS(mm, mmi);                                        // allocate as many UMBs as possible
 695         }
 696
 697 //
 698 // allocate the misc buffer
 699 //
 700 xmsskip:
 701         mm->mmrover = mm->mmhead;               // start looking for space after low block
 702
 703         MM_GetPtr(&(mm->bufferseg),BUFFERSIZE, mm, mmi);
 704 }
 705
 706 //==========================================================================
 707
 708 /*
 709 ====================
 710 =
 711 = MM_Shutdown
 712 =
 713 = Frees all conventional, EMS, and XMS allocated
 714 =
 715 ====================
 716 */
 717
 718 void MM_Shutdown(mminfo_t *mm)
 719 {
 720         if(!(mm->mmstarted))
 721                 return;
 722
 723         _ffree(mm->farheap);
 724         printf("far freed\n");
 725         free(mm->nearheap);
 726         printf("near freed\n");
 727         //hfree(mm->hugeheap);
 728         //printf("huge freed\n");
 729         if(MML_CheckForEMS()){ MML_ShutdownEMS(mm); printf("EMS freed\n"); }
 730         if(MML_CheckForXMS(mm)){ MML_ShutdownXMS(mm); printf("XMS freed\n"); }
 731 }
 732
 733 //==========================================================================
 734
 735 /*
 736 ====================
 737 =
 738 = MM_GetPtr
 739 =
 740 = Allocates an unlocked, unpurgable block
 741 =
 742 ====================
 743 */
 744
 745 void MM_GetPtr(memptr *baseptr,dword size, mminfo_t *mm, mminfotype *mmi)
 746 {
 747         mmblocktype huge *scan,huge *lastscan,huge *endscan,huge *purge,huge *next;
 748         int                     search;
 749         unsigned        needed,startseg;
 750
 751         needed = (size+15)/16;          // convert size from bytes to paragraphs
 752
 753         MM_GetNewBlock(mm);                             // fill in start and next after a spot is found
 754         mm->mmnew->length = needed;
 755         mm->mmnew->useptr = baseptr;
 756         mm->mmnew->attributes = BASEATTRIBUTES;
 757
 758         for(search = 0; search<3; search++)
 759         {
 760         //
 761         // first search:        try to allocate right after the rover, then on up
 762         // second search:       search from the head pointer up to the rover
 763         // third search:        compress memory, then scan from start
 764                 if(search == 1 && mm->mmrover == mm->mmhead)
 765                         search++;
 766
 767                 switch(search)
 768                 {
 769                 case 0:
 770                         lastscan = mm->mmrover;
 771                         scan = mm->mmrover->next;
 772                         endscan = NULL;
 773                         break;
 774                 case 1:
 775                         lastscan = mm->mmhead;
 776                         scan = mm->mmhead->next;
 777                         endscan = mm->mmrover;
 778                         break;
 779                 case 2:
 780                         MM_SortMem(mm);
 781                         lastscan = mm->mmhead;
 782                         scan = mm->mmhead->next;
 783                         endscan = NULL;
 784                         break;
 785                 }
 786
 787                 startseg = lastscan->start + lastscan->length;
 788
 789                 while(scan != endscan)
 790                 {
 791                         if(scan->start - startseg >= needed)
 792                         {
 793                         //
 794                         // got enough space between the end of lastscan and
 795                         // the start of scan, so throw out anything in the middle
 796                         // and allocate the new block
 797                         //
 798                                 purge = lastscan->next;
 799                                 lastscan->next = mm->mmnew;
 800                                 mm->mmnew->start = *(unsigned *)baseptr = startseg;
 801                                 mm->mmnew->next = scan;
 802                                 while(purge != scan)
 803                                 {       // free the purgable block
 804                                         next = purge->next;
 805                                         MM_FreeBlock(purge, mm);
 806                                         purge = next;           // purge another if not at scan
 807                                 }
 808                                 mm->mmrover = mm->mmnew;
 809                                 return; // good allocation!
 810                         }
 811
 812                         //
 813                         // if this block is purge level zero or locked, skip past it
 814                         //
 815                         if((scan->attributes & LOCKBIT)
 816                                 || !(scan->attributes & PURGEBITS) )
 817                         {
 818                                 lastscan = scan;
 819                                 startseg = lastscan->start + lastscan->length;
 820                         }
 821
 822
 823                         scan=scan->next;                // look at next line
 824                 }
 825         }
 826
 827         if (mm->bombonerror)
 828                 printf(OUT_OF_MEM_MSG,(size-mmi->nearheap));
 829         else
 830                 mm->mmerror = true;
 831 }
 832
 833 //==========================================================================
 834
 835 /*
 836 ====================
 837 =
 838 = MM_FreePtr
 839 =
 840 = Allocates an unlocked, unpurgable block
 841 =
 842 ====================
 843 */
 844
 845 void MM_FreePtr(memptr *baseptr, mminfo_t *mm)
 846 {
 847         mmblocktype huge *scan,huge *last;
 848
 849         last = mm->mmhead;
 850         scan = last->next;
 851
 852         if(baseptr == mm->mmrover->useptr)      // removed the last allocated block
 853                 mm->mmrover = mm->mmhead;
 854
 855         while(scan->useptr != baseptr && scan)
 856         {
 857                 last = scan;
 858                 scan = scan->next;
 859         }
 860
 861         if(!scan)
 862         {
 863                 printf("MM_FreePtr: Block not found!");
 864                 return;
 865         }
 866
 867         last->next = scan->next;
 868
 869         MM_FreeBlock(scan, mm);
 870 }
 871 //==========================================================================
 872
 873 /*
 874 =====================
 875 =
 876 = MM_SetPurge
 877 =
 878 = Sets the purge level for a block (locked blocks cannot be made purgable)
 879 =
 880 =====================
 881 */
 882
 883 void MM_SetPurge(memptr *baseptr, int purge, mminfo_t *mm)
 884 {
 885         mmblocktype huge *start;
 886
 887         start = mm->mmrover;
 888
 889         do
 890         {
 891                 if(mm->mmrover->useptr == baseptr)
 892                         break;
 893
 894                 mm->mmrover = mm->mmrover->next;
 895
 896                 if(!mm->mmrover)
 897                         mm->mmrover = mm->mmhead;
 898                 else if(mm->mmrover == start)
 899                 {
 900                         printf("MM_SetPurge: Block not found!");
 901                         return;
 902                 }
 903
 904         } while(1);
 905
 906         mm->mmrover->attributes &= ~PURGEBITS;
 907         mm->mmrover->attributes |= purge;
 908 }
 909
 910 //==========================================================================
 911
 912 /*
 913 =====================
 914 =
 915 = MM_SetLock
 916 =
 917 = Locks / unlocks the block
 918 =
 919 =====================
 920 */
 921
 922 void MM_SetLock(memptr *baseptr, boolean locked, mminfo_t *mm)
 923 {
 924         mmblocktype huge *start;
 925
 926         start = mm->mmrover;
 927
 928         do
 929         {
 930                 if(mm->mmrover->useptr == baseptr)
 931                         break;
 932
 933                 mm->mmrover = mm->mmrover->next;
 934
 935                 if(!mm->mmrover)
 936                         mm->mmrover = mm->mmhead;
 937                 else if(mm->mmrover == start)
 938                 {
 939                         printf("MM_SetLock: Block not found!");
 940                         return;
 941                 }
 942
 943         } while(1);
 944
 945         mm->mmrover->attributes &= ~LOCKBIT;
 946         mm->mmrover->attributes |= locked*LOCKBIT;
 947 }
 948
 949 //==========================================================================
 950
 951 /*
 952 =====================
 953 =
 954 = MM_SortMem
 955 =
 956 = Throws out all purgable stuff and compresses movable blocks
 957 =
 958 =====================
 959 */
 960
 961 void MM_SortMem(mminfo_t *mm)
 962 {
 963         mmblocktype huge *scan,huge *last,huge *next;
 964         unsigned        start,length,source,dest,oldborder;
 965         int                     playing;
 966
 967         //
 968         // lock down a currently playing sound
 969         //
 970 /*++++  playing = SD_SoundPlaying ();
 971         if(playing)
 972         {
 973                 switch (SoundMode)
 974                 {
 975                 case sdm_PC:
 976                         playing += STARTPCSOUNDS;
 977                         break;
 978                 case sdm_AdLib:
 979                         playing += STARTADLIBSOUNDS;
 980                         break;
 981                 }
 982                 MM_SetLock(&(memptr)audiosegs[playing],true);
 983         }
 984
 985
 986         SD_StopSound();*/
 987 //      oldborder = bordercolor;
 988 //      VW_ColorBorder (15);
 989
 990         if(beforesort)
 991                 beforesort();
 992
 993         scan = mm->mmhead;
 994
 995         last = NULL;            // shut up compiler warning
 996
 997         while(scan)
 998         {
 999                 if(scan->attributes & LOCKBIT)
1000                 {
1001                 //
1002                 // block is locked, so try to pile later blocks right after it
1003                 //
1004                         start = scan->start + scan->length;
1005                 }
1006                 else
1007                 {
1008                         if(scan->attributes & PURGEBITS)
1009                         {
1010                         //
1011                         // throw out the purgable block
1012                         //
1013                                 next = scan->next;
1014                                 MM_FreeBlock(scan, mm);
1015                                 last->next = next;
1016                                 scan = next;
1017                                 continue;
1018                         }
1019                         else
1020                         {
1021                         //
1022                         // push the non purgable block on top of the last moved block
1023                         //
1024                                 if(scan->start != start)
1025                                 {
1026                                         length = scan->length;
1027                                         source = scan->start;
1028                                         dest = start;
1029                                         while(length > 0xf00)
1030                                         {
1031                                                 movedata(source,0,dest,0,0xf00*16);
1032                                                 length -= 0xf00;
1033                                                 source += 0xf00;
1034                                                 dest += 0xf00;
1035                                         }
1036                                         movedata(source,0,dest,0,length*16);
1037
1038                                         scan->start = start;
1039                                         *(unsigned *)scan->useptr = start;
1040                                 }
1041                                 start = scan->start + scan->length;
1042                         }
1043                 }
1044
1045                 last = scan;
1046                 scan = scan->next;              // go to next block
1047         }
1048
1049         mm->mmrover = mm->mmhead;
1050
1051         if(aftersort)
1052                 aftersort();
1053
1054 //      VW_ColorBorder (oldborder);
1055
1056 /*++++  if(playing)
1057                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
1058 }
1059
1060
1061 //==========================================================================
1062
1063 //****#if 0
1064 /*
1065 =====================
1066 =
1067 = MM_ShowMemory
1068 =
1069 =====================
1070 */
1071
1072 void MM_ShowMemory(page_t *page, mminfo_t *mm)
1073 {
1074         mmblocktype huge *scan;
1075         unsigned color,temp;
1076         long    end,owner;
1077         word chx,chy;
1078         char    scratch[160],str[16];
1079
1080 //****  VW_SetDefaultColors();
1081 //****  VW_SetLineWidth(40);
1082 //++++mh        temp = bufferofs;
1083 //++++mh        bufferofs = 0;
1084 //****  VW_SetScreen (0,0);
1085
1086         scan = mm->mmhead;
1087
1088         end = -1;
1089
1090 //CA_OpenDebug ();
1091
1092         chx=0;
1093         chy=0;
1094
1095         while(scan)
1096         {
1097                 if(scan->attributes & PURGEBITS)
1098                         color = 5;              // dark purple = purgable
1099                 else
1100                         color = 9;              // medium blue = non purgable
1101                 if(scan->attributes & LOCKBIT)
1102                         color = 12;             // red = locked
1103                 if(scan->start<=end)
1104                 {
1105                         //printf("\nMM_ShowMemory: Memory block order currupted!\n");
1106                         modexprint(&page, chx, chy, 1, 0, 24, "\nMM_ShowMemory: Memory block order currupted!\n");
1107                         return;
1108                 }
1109                 end = scan->start+scan->length-1;
1110 //++++                          modexhlin(page, scan->start, (unsigned)end, chy, color);
1111 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1112 //void VW_Plot(unsigned x, unsigned y, unsigned color);
1113 //void VW_Hlin(unsigned xl, unsigned xh, unsigned y, unsigned color);
1114
1115 //++++          VW_Plot(scan->start,0,15);
1116 //++++                          modexputPixel(page, scan->start, chy, 15);
1117                 if(scan->next->start > end+1)
1118 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1119
1120 //****#if 0
1121 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!
1122 strcpy(scratch,"Seg:");
1123 ultoa (scan->start,str,16);
1124 strcat (scratch,str);
1125 strcat (scratch,"\tSize:");
1126 ltoa ((dword)scan->length*16,str,10);
1127 strcat (scratch,str);
1128 strcat (scratch,"\tOwner:0x");
1129 owner = (unsigned)scan->useptr;
1130 ultoa (owner,str,16);
1131 strcat (scratch,str);
1132 strcat (scratch,"\n");
1133 //++++write (debughandle,scratch,strlen(scratch));
1134 modexprint(page, chx, chy, 1, 0, 24, &scratch);
1135 chy+=8;
1136 //fprintf(stdout, "%s", scratch);
1137 //****#endif
1138
1139                 scan = scan->next;
1140         }
1141
1142 //CA_CloseDebug ();
1143
1144 //++++mh        IN_Ack();
1145 //****  VW_SetLineWidth(64);
1146 //++++mh        bufferofs = temp;
1147 }
1148 //****#endif
1149
1150 //==========================================================================
1151
1152
1153 /*
1154 ======================
1155 =
1156 = MM_UnusedMemory
1157 =
1158 = Returns the total free space without purging
1159 =
1160 ======================
1161 */
1162
1163 dword MM_UnusedMemory(mminfo_t *mm)
1164 {
1165         dword free;
1166         mmblocktype huge *scan;
1167
1168         free = 0;
1169         scan = mm->mmhead;
1170
1171         while(scan->next)
1172         {
1173                 free += scan->next->start - (scan->start + scan->length);
1174                 scan = scan->next;
1175         }
1176
1177         return free*16l;
1178 //      return free;
1179 }
1180
1181 //==========================================================================
1182
1183
1184 /*
1185 ======================
1186 =
1187 = MM_TotalFree
1188 =
1189 = Returns the total free space with purging
1190 =
1191 ======================
1192 */
1193
1194 dword MM_TotalFree(mminfo_t *mm)
1195 {
1196         dword free;
1197         mmblocktype huge *scan;
1198
1199         free = 0;
1200         scan = mm->mmhead;
1201
1202         while(scan->next)
1203         {
1204                 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1205                         free += scan->length;
1206                 free += scan->next->start - (scan->start + scan->length);
1207                 scan = scan->next;
1208         }
1209
1210         return free*16l;
1211 //      return free;
1212 }
1213
1214 //==========================================================================
1215
1216 /*
1217 =====================
1218 =
1219 = MM_Report
1220 =
1221 =====================
1222 */
1223
1224 void MM_Report(page_t *page, mminfo_t *mm, mminfotype *mmi)
1225 {
1226         if(MML_CheckForEMS())
1227         {
1228                 printf("EMM v%x.%x available\n", mm->EMSVer>>4,mm->EMSVer&0x0F);
1229                 printf("totalEMSpages=%u\n", mm->totalEMSpages);
1230                 printf("freeEMSpages=%u\n", mm->freeEMSpages);
1231                 printf("EMSpageframe=%x\n", mm->EMSpageframe);
1232         }
1233         if(MML_CheckForXMS(mm)) printf("XMSaddr=%Fp\n", *XMSaddr);
1234         printf("near=%lu\n", mmi->nearheap);
1235         printf("far=%lu\n", mmi->farheap);
1236         printf("EMSmem=%lu\n", mmi->EMSmem);
1237         printf("XMSmem=%lu\n", mmi->XMSmem);
1238         printf("mainmem=%lu\n", mmi->mainmem);
1239         printf("UnusedMemory=%lu\n", MM_UnusedMemory(mm));
1240         printf("TotalFree=%lu\n", MM_TotalFree(mm));
1241 //      printf("\n");
1242 //      printf("UnusedMemory=%lu kb\n", MM_UnusedMemory()/10248);
1243 //      printf("TotalFree=%lu kb\n", MM_TotalFree()/10248);
1244 }
1245
1246 //==========================================================================
1247
1248 /*
1249 =====================
1250 =
1251 = MM_EMSVer
1252 =
1253 =====================
1254
1255
1256 int MM_EMSVer(void)
1257 {
1258         int EMSver;
1259         __asm
1260         {
1261                 mov             ah,EMS_VERSION
1262                 int             EMS_INT
1263                 mov             EMSver,ax
1264         }
1265         return(EMSver);
1266 }*/
1267
1268 //==========================================================================
1269
1270 /*
1271 =====================
1272 =
1273 = MM_BombOnError
1274 =
1275 =====================
1276 */
1277
1278 void MM_BombOnError(boolean bomb, mminfo_t *mm)
1279 {
1280         mm->bombonerror = bomb;
1281 }
1282
1283 void MM_GetNewBlock(mminfo_t *mm)
1284 {
1285         if(!mm->mmfree)
1286                 MML_ClearBlock(mm);
1287         mm->mmnew=mm->mmfree;
1288         mm->mmfree=mm->mmfree->next;
1289         /*if(!(mm->mmnew=mm->mmfree))
1290         {
1291                 printf("MM_GETNEWBLOCK: No free blocks!");
1292                 return;
1293         }
1294         mm->mmfree=mm->mmfree->next;*/
1295 }
1296
1297 void MM_FreeBlock(mmblocktype *x, mminfo_t *mm)
1298 {
1299         x->useptr=NULL;
1300         x->next=mm->mmfree;
1301         mm->mmfree=x;
1302 }
1303
1304 void MM_seguin(void)
1305 {
1306         __asm
1307         {
1308                 push    ds
1309                 mov     ax,ds
1310                 inc             ax
1311                 mov     ds,ax
1312         }
1313 }
1314
1315 void MM_segude(void)
1316 {
1317         __asm
1318         {
1319                 pop ds
1320         }
1321 }
1322
1323 /*
1324 pull data from far and put it into ds var
1325 mov ax,es:si
1326 mov x,ax
1327 */
1328 /*
1329 ss stack segment
1330 sp top of stack
1331 bp bottem of stack
1332 */