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         //byte  EMS_status;
 147         unsigned        totalEMSpages,freeEMSpages,EMSpageframe,EMSpagesmapped,EMShandle;
 148         totalEMSpages = freeEMSpages = EMSpageframe = EMSpagesmapped = 0;
 149
 150         __asm
 151                 {
 152                 mov     ah,EMS_STATUS
 153                 int     EMS_INT                                         // make sure EMS hardware is present
 154                 or      ah,ah
 155                 //mov   [EMS_status],ah
 156                 jnz     error
 157
 158                 mov     ah,EMS_VERSION
 159                 int     EMS_INT
 160                 or      ah,ah
 161                 jnz     error
 162                 mov     [EMSVer],ax                             //      set EMSVer
 163                 cmp     al,0x32                                         // only work on ems 3.2 or greater
 164                 jb      error
 165
 166                 mov     ah,EMS_GETFRAME
 167                 int     EMS_INT                                         // find the page frame address
 168                 or      ah,ah
 169                 jnz     error
 170                 mov     [EMSpageframe],bx
 171
 172                 mov     ah,EMS_GETPAGES
 173                 int     EMS_INT                                         // find out how much EMS is there
 174                 or      ah,ah
 175                 jnz     error
 176                 mov     [totalEMSpages],dx
 177                 mov     [freeEMSpages],bx
 178                 or      bx,bx
 179                 jz      noEMS                                           // no EMS at all to allocate
 180                                                                                         //EXPAND DONG!!!!
 181                 cmp     [EMSVer],0x40
 182                 jb      low
 183                 cmp     bx,[freeEMSpages]
 184                 jle     getpages
 185                 mov     bx,[freeEMSpages]
 186                 jmp     getpages
 187
 188 low:
 189                 cmp     bx,4
 190                 jle     getpages                                        // there is only 1,2,3,or 4 pages
 191                 mov     bx,4                                            // we can't use more than 4 pages
 192
 193 getpages:
 194                 mov     [EMSpagesmapped],bx
 195                 mov     ah,EMS_ALLOCPAGES                       // allocate up to 64k of EMS
 196                 int     EMS_INT
 197                 or      ah,ah
 198                 jnz     error
 199                 mov     [EMShandle],dx
 200                 jmp End
 201 error:
 202                 mov     errorflag,1
 203                 jmp End
 204 noEMS:
 205 End:
 206         }
 207         if(errorflag==true)
 208         {
 209                 err = CPURegs.h.ah;
 210                 strcpy(str,"MML_SetupEMS: EMS error 0x");
 211                 itoa(err,str2,16);
 212                 strcpy(str,str2);
 213                 printf("%s\n",str);
 214                 return err;
 215         }
 216         mm->totalEMSpages=totalEMSpages;
 217         mm->freeEMSpages=freeEMSpages;
 218         mm->EMSpageframe=EMSpageframe;
 219         mm->EMSpagesmapped=EMSpagesmapped;
 220         mm->EMShandle=EMShandle;
 221         mm->EMSVer=EMSVer;
 222         return 0;
 223 }
 224
 225
 226 /*
 227 ======================
 228 =
 229 = MML_ShutdownEMS
 230 =
 231 =======================
 232 */
 233
 234 void MML_ShutdownEMS(mminfo_t *mm)
 235 {
 236         boolean errorflag=false;
 237         unsigned EMShandle=mm->EMShandle;
 238
 239         if(!EMShandle)
 240                 return;
 241         __asm
 242         {
 243                 mov     ah,EMS_FREEPAGES
 244                 mov     dx,[EMShandle]
 245                 int     EMS_INT
 246                 or      ah,ah
 247                 jz      ok
 248                 mov     errorflag,1
 249                 ok:
 250         }
 251         if(errorflag==true) printf("MML_ShutdownEMS: Error freeing EMS!");      //++++ add something
 252 }
 253
 254 /*
 255 ====================
 256 =
 257 = MM_MapEMS
 258 =
 259 = Maps the 64k of EMS used by memory manager into the page frame
 260 = for general use.  This only needs to be called if you are keeping
 261 = other things in EMS.
 262 =
 263 ====================
 264 */
 265
 266 unsigned MM_MapEMS(mminfo_t *mm)
 267 {
 268         char    str[80],str2[10];
 269         unsigned        err, EMShandle;
 270         boolean errorflag=false;
 271         int     i;
 272         union REGS CPURegs;
 273         EMShandle=mm->EMShandle;
 274
 275         for (i=0;i<MAPPAGES/*4mm->EMSpagesmapped*/;i++)
 276         {
 277                 __asm
 278                 {
 279                         mov     ah,EMS_MAPPAGE
 280                         mov     bx,[i]                  // logical page
 281                         mov     al,bl                   // physical page
 282                         mov     dx,[EMShandle]  // handle
 283                         int     EMS_INT
 284                         or      ah,ah
 285                         jnz     error
 286                         jmp End
 287                         error:
 288                         mov     errorflag,1
 289                         End:
 290                 }
 291                 if(errorflag==true)
 292                 {
 293                         err = CPURegs.h.ah;
 294                         strcpy(str,"MM_MapEMS: EMS error 0x");
 295                         itoa(err,str2,16);
 296                         strcpy(str,str2);
 297                         //printf("%s\n",str);
 298                         printf("FACK! %u\n", err);
 299                         return err;
 300                 }
 301         }
 302         return 0;
 303 }
 304
 305 /*
 306 SUB EMS.MapXPages (PhysicalStart, LogicalStart, NumPages, Handle)\r
 307 \r
 308   'Maps up to 4 logical EMS pages to physical pages in the page frame, where:\r
 309   '\r
 310   'PhysicalStart = Physical page first logical page is mapped to\r
 311   'LogicalStart  = First logical page to map\r
 312   'NumPages      = Number of pages to map (1 to 4)\r
 313   'Handle        = EMS handle logical pages are allocated to\r
 314 \r
 315   'Create a buffer containing the page information\r
 316   FOR x = 0 TO NumPages - 1\r
 317     MapInfo$ = MapInfo$ + MKI$(LogicalStart + x) + MKI$(PhysicalStart + x)\r
 318   NEXT\r
 319 \r
 320   Regs.ax = &H5000                           'Map the pages in the buffer\r
 321   Regs.cx = NumPages                         'to the pageframe\r
 322   Regs.dx = Handle\r
 323   Regs.ds = VARSEG(MapInfo$)\r
 324   Regs.si = SADD(MapInfo$)\r
 325   InterruptX &H67, Regs, Regs\r
 326   EMS.Error = (Regs.ax AND &HFF00&) \ &H100  'Store the status code\r
 327 \r
 328 END SUB
 329 */
 330 void MM_MapXEMS(mminfo_t *mm)
 331 {
 332
 333 }
 334
 335 //==========================================================================
 336
 337 /*
 338 ======================
 339 =
 340 = MML_CheckForXMS
 341 =
 342 = Check for XMM driver
 343 =
 344 =======================
 345 */
 346
 347 boolean MML_CheckForXMS(mminfo_t *mm)
 348 {
 349         boolean errorflag=false;
 350         mm->numUMBs = 0;
 351
 352         __asm
 353         {
 354                 mov     ax,0x4300
 355                 int     0x2f                            // query status of installed diver
 356                 cmp     al,0x80
 357                 je      good
 358                 mov     errorflag,1
 359                 good:
 360         }
 361         if(errorflag==true) return false;
 362         else return true;
 363 }
 364
 365
 366 /*
 367 ======================
 368 =
 369 = MML_SetupXMS
 370 =
 371 = Try to allocate all upper memory block
 372 =
 373 =======================
 374 */
 375
 376 void MML_SetupXMS(mminfo_t *mm, mminfotype *mmi)
 377 {
 378         unsigned        base,size;
 379
 380 getmemory:
 381         __asm
 382         {
 383                 mov     ax,0x4310
 384                 int     0x2f
 385                 mov     [WORD PTR XMSaddr],bx
 386                 mov     [WORD PTR XMSaddr+2],es         // function pointer to XMS driver
 387
 388                 mov     ah,XMS_ALLOCUMB
 389                 mov     dx,0xffff                                       // try for largest block possible
 390                 //mov     ax,dx                                         // Set available Kbytes.
 391                 call    [DWORD PTR XMSaddr]
 392                 or      ax,ax
 393                 jnz     gotone
 394
 395                 cmp     bl,0xb0                                         // error: smaller UMB is available
 396                 jne     done;
 397
 398                 mov     ah,XMS_ALLOCUMB
 399                 call    [DWORD PTR XMSaddr]             // DX holds largest available UMB
 400                 or      ax,ax
 401                 jz      done                                            // another error...
 402
 403 gotone:
 404                 mov     [base],bx
 405                 mov     [size],dx
 406 done:
 407         }
 408         printf("base=%u ", base); printf("size=%u\n", size);
 409         MML_UseSpace(base,size, mm);
 410         mmi->XMSmem += size*16;
 411         mm->UMBbase[mm->numUMBs] = base;
 412         mm->numUMBs++;
 413         if(mm->numUMBs < MAXUMBS)
 414                 goto getmemory;
 415 }
 416
 417
 418 /*
 419 ======================
 420 =
 421 = MML_ShutdownXMS
 422 =
 423 ======================
 424 */
 425
 426 void MML_ShutdownXMS(mminfo_t *mm)
 427 {
 428         int     i;
 429         unsigned        base;
 430
 431         for (i=0;i<mm->numUMBs;i++)
 432         {
 433                 base = mm->UMBbase[i];
 434                 __asm
 435                 {
 436                         mov     ah,XMS_FREEUMB
 437                         mov     dx,[base]
 438                         call    [DWORD PTR XMSaddr]
 439                 }
 440         }
 441 }
 442
 443 //==========================================================================
 444
 445 /*
 446 ======================
 447 =
 448 = MML_UseSpace
 449 =
 450 = Marks a range of paragraphs as usable by the memory manager
 451 = This is used to mark space for the near heap, far heap, ems page frame,
 452 = and upper memory blocks
 453 =
 454 ======================
 455 */
 456
 457 void MML_UseSpace(/*d*/word segstart, dword seglength, mminfo_t *mm)
 458 {
 459         mmblocktype huge *scan,huge *last;
 460         word            segm;
 461         dword   oldend;
 462         dword           extra;
 463
 464         scan = last = mm->mmhead;
 465         mm->mmrover = mm->mmhead;               // reset rover to start of memory
 466
 467 //
 468 // search for the block that contains the range of segments
 469 //
 470         while(scan->start+scan->length < segstart)
 471         {
 472                 last = scan;
 473                 scan = scan->next;
 474         }
 475
 476         //find out how many blocks it spans!
 477         if(seglength>0xffffu)
 478         {
 479 //              segm=seglength/0x4000u;
 480                 segm=seglength/0xffffu;
 481         }
 482         else segm=1;
 483
 484         //++++emsver stuff!
 485         if(segm>1/*extra>0xfffflu*/)
 486         {
 487                 /*__asm
 488                 {
 489                         push    ds
 490                         mov     ax,ds
 491                         inc             ax
 492                         mov     ds,ax
 493                 }*/
 494
 495
 496 //MML_UseSpace(?segstart?, ?length?, mm);
 497
 498                 /*__asm
 499                 {
 500                         pop ds
 501                 }*/
 502                 //printf("MML_UseSpace: Segment spans two blocks!\n");
 503         }
 504
 505 //
 506 // take the given range out of the block
 507 //
 508         oldend = scan->start + scan->length;
 509         extra = oldend - (segstart+seglength);
 510
 511 printf("segm=%u ", segm);
 512 printf("ex=%lu  ", extra);
 513 printf("start+seglen=%lu        ", segstart+seglength);
 514 printf("len=%u  ", scan->length);
 515 printf("segsta=%x       ", segstart);
 516 printf("seglen=%lu\n", seglength);
 517
 518 //segu:
 519 //++++todo: linked list of segment!
 520 //printf("segm=%lu\n", segm);
 521         if(segstart == scan->start)
 522         {
 523                 last->next = scan->next;                        // unlink block
 524                 MM_FreeBlock(scan, mm);
 525                 scan = last;
 526         }
 527         else
 528                 scan->length = segstart-scan->start;    // shorten block
 529
 530 //      segm--;
 531
 532         if(extra > 0)
 533         {
 534                 MM_GetNewBlock(mm);
 535                 mm->mmnew->next = scan->next;
 536                 scan->next = mm->mmnew;
 537                 mm->mmnew->start = segstart+seglength;
 538                 mm->mmnew->length = extra;
 539                 mm->mmnew->attributes = LOCKBIT;
 540         }//else if(segm>0) goto segu;
 541
 542 }
 543
 544 //==========================================================================
 545
 546 /*
 547 ====================
 548 =
 549 = MML_ClearBlock
 550 =
 551 = We are out of blocks, so free a purgable block
 552 =
 553 ====================
 554 */
 555
 556 void MML_ClearBlock(mminfo_t *mm)
 557 {
 558         mmblocktype huge *scan,huge *last;
 559
 560         scan = mm->mmhead->next;
 561
 562         while(scan)
 563         {
 564                 if(!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS))
 565                 {
 566                         MM_FreePtr(scan->useptr, mm);
 567                         return;
 568                 }
 569                 scan = scan->next;
 570         }
 571
 572         printf("MM_ClearBlock: No purgable blocks!\n");
 573 }
 574
 575
 576 //==========================================================================
 577
 578 /*
 579 ===================
 580 =
 581 = MM_Startup
 582 =
 583 = Grabs all space from turbo with malloc/farmalloc
 584 = Allocates bufferseg misc buffer
 585 =
 586 ===================
 587 */
 588
 589 void MM_Startup(mminfo_t *mm, mminfotype *mmi)
 590 {
 591         int i;
 592         dword length;
 593         void huge       *start;
 594         unsigned        segstart,seglength,endfree;
 595
 596         if(mm->mmstarted)
 597                 MM_Shutdown(mm);
 598
 599         mm->mmstarted = true;
 600         mm->bombonerror = true;
 601 //
 602 // set up the linked list (everything in the free list;
 603 //
 604         mm->mmhead = NULL;
 605         mm->mmfree = &(mm->mmblocks[0]);
 606         for(i=0;i<MAXBLOCKS-1;i++)
 607         {
 608                 mm->mmblocks[i].next = &(mm->mmblocks[i+1]);
 609         }
 610         mm->mmblocks[i].next = NULL;
 611
 612 //
 613 // locked block of all memory until we punch out free space
 614 //
 615         MM_GetNewBlock(mm);
 616         mm->mmhead = mm->mmnew;                         // this will allways be the first node
 617         mm->mmnew->start = 0;
 618         mm->mmnew->length = 0xffff;
 619         mm->mmnew->attributes = LOCKBIT;
 620         mm->mmnew->next = NULL;
 621         mm->mmrover = mm->mmhead;
 622
 623 //      farlen=_bios_memsize()*1024;
 624
 625 //
 626 // get all available near conventional memory segments
 627 //
 628 //----  length=coreleft();
 629         _nheapgrow();
 630         length=_memavl();
 631         start = (void huge *)(mm->nearheap = malloc(length));
 632         length -= 16-(FP_OFF(start)&15);
 633         length -= SAVENEARHEAP;
 634         seglength = length / 16;                        // now in paragraphs
 635         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 636         MML_UseSpace(segstart,seglength, mm);
 637         mmi->nearheap = length;
 638         //printf("near heap ok!\n");
 639
 640 //
 641 // get all available far conventional memory segments
 642 //
 643 //----  length=farcoreleft();
 644         _fheapgrow();
 645         length=_memavl();
 646         start = mm->farheap = halloc(length, sizeof(byte));
 647         //start = mm->farheap = _fmalloc(length);
 648         length -= 16-(FP_OFF(start)&15);
 649         length -= SAVEFARHEAP;
 650         seglength = length / 16;                        // now in paragraphs
 651         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 652         MML_UseSpace(segstart,seglength, mm);
 653         mmi->farheap = length;
 654         mmi->mainmem = mmi->nearheap + mmi->farheap;
 655         //printf("far heap ok!\n");
 656
 657
 658 //
 659 // detect EMS and allocate up to 64K at page frame
 660 //
 661         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!
 662         mmi->EMSmem = 0;
 663         for(i = 1;i < __argc;i++)
 664         {
 665                 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 666                         goto emsskip;                           // param NOEMS
 667         }
 668         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!
 669         if(MML_CheckForEMS())
 670         {
 671 printf("EMS1\n");
 672                 MML_SetupEMS(mm);                                       // allocate space
 673 printf("EMS2\n");
 674                 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!
 675                 //TODO: EMS4! AND EMS 3.2 MASSIVE DATA HANDLMENT!
 676                 MML_UseSpace(mm->EMSpageframe,(MAPPAGES)*0x4000lu, mm);
 677 printf("EMS3\n");
 678                 MM_MapEMS(mm);                                  // map in used pages
 679 printf("EMS4\n");
 680                 mmi->EMSmem = (MAPPAGES)*0x4000lu;
 681         }
 682
 683 //
 684 // detect XMS and get upper memory blocks
 685 //
 686 emsskip:
 687         mmi->XMSmem = 0;
 688         for(i = 1;i < __argc;i++)
 689         {
 690                 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 691                         goto xmsskip;                           // param NOXMS
 692         }
 693         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!
 694         if(MML_CheckForXMS(mm))
 695         {
 696                 printf("XMS!\n");
 697                 //MML_SetupXMS(mm, mmi);                                        // allocate as many UMBs as possible
 698         }
 699
 700 //
 701 // allocate the misc buffer
 702 //
 703 xmsskip:
 704         mm->mmrover = mm->mmhead;               // start looking for space after low block
 705
 706         MM_GetPtr(&(mm->bufferseg),BUFFERSIZE, mm, mmi);
 707 }
 708
 709 //==========================================================================
 710
 711 /*
 712 ====================
 713 =
 714 = MM_Shutdown
 715 =
 716 = Frees all conventional, EMS, and XMS allocated
 717 =
 718 ====================
 719 */
 720
 721 void MM_Shutdown(mminfo_t *mm)
 722 {
 723         if(!(mm->mmstarted))
 724                 return;
 725
 726         _ffree(mm->farheap);
 727         printf("far freed\n");
 728         free(mm->nearheap);
 729         printf("near freed\n");
 730         //hfree(mm->hugeheap);
 731         //printf("huge freed\n");
 732         if(MML_CheckForEMS()){ MML_ShutdownEMS(mm); printf("EMS freed\n"); }
 733         if(MML_CheckForXMS(mm)){ MML_ShutdownXMS(mm); printf("XMS freed\n"); }
 734 }
 735
 736 //==========================================================================
 737
 738 /*
 739 ====================
 740 =
 741 = MM_GetPtr
 742 =
 743 = Allocates an unlocked, unpurgable block
 744 =
 745 ====================
 746 */
 747
 748 void MM_GetPtr(memptr *baseptr,dword size, mminfo_t *mm, mminfotype *mmi)
 749 {
 750         mmblocktype huge *scan,huge *lastscan,huge *endscan,huge *purge,huge *next;
 751         int                     search;
 752         unsigned        needed,startseg;
 753
 754         needed = (size+15)/16;          // convert size from bytes to paragraphs
 755
 756         MM_GetNewBlock(mm);                             // fill in start and next after a spot is found
 757         mm->mmnew->length = needed;
 758         mm->mmnew->useptr = baseptr;
 759         mm->mmnew->attributes = BASEATTRIBUTES;
 760
 761         for(search = 0; search<3; search++)
 762         {
 763         //
 764         // first search:        try to allocate right after the rover, then on up
 765         // second search:       search from the head pointer up to the rover
 766         // third search:        compress memory, then scan from start
 767                 if(search == 1 && mm->mmrover == mm->mmhead)
 768                         search++;
 769
 770                 switch(search)
 771                 {
 772                 case 0:
 773                         lastscan = mm->mmrover;
 774                         scan = mm->mmrover->next;
 775                         endscan = NULL;
 776                         break;
 777                 case 1:
 778                         lastscan = mm->mmhead;
 779                         scan = mm->mmhead->next;
 780                         endscan = mm->mmrover;
 781                         break;
 782                 case 2:
 783                         MM_SortMem(mm);
 784                         lastscan = mm->mmhead;
 785                         scan = mm->mmhead->next;
 786                         endscan = NULL;
 787                         break;
 788                 }
 789
 790                 startseg = lastscan->start + lastscan->length;
 791
 792                 while(scan != endscan)
 793                 {
 794                         if(scan->start - startseg >= needed)
 795                         {
 796                         //
 797                         // got enough space between the end of lastscan and
 798                         // the start of scan, so throw out anything in the middle
 799                         // and allocate the new block
 800                         //
 801                                 purge = lastscan->next;
 802                                 lastscan->next = mm->mmnew;
 803                                 mm->mmnew->start = *(unsigned *)baseptr = startseg;
 804                                 mm->mmnew->next = scan;
 805                                 while(purge != scan)
 806                                 {       // free the purgable block
 807                                         next = purge->next;
 808                                         MM_FreeBlock(purge, mm);
 809                                         purge = next;           // purge another if not at scan
 810                                 }
 811                                 mm->mmrover = mm->mmnew;
 812                                 return; // good allocation!
 813                         }
 814
 815                         //
 816                         // if this block is purge level zero or locked, skip past it
 817                         //
 818                         if((scan->attributes & LOCKBIT)
 819                                 || !(scan->attributes & PURGEBITS) )
 820                         {
 821                                 lastscan = scan;
 822                                 startseg = lastscan->start + lastscan->length;
 823                         }
 824
 825
 826                         scan=scan->next;                // look at next line
 827                 }
 828         }
 829
 830         if (mm->bombonerror)
 831                 printf(OUT_OF_MEM_MSG,(size-mmi->nearheap));
 832         else
 833                 mm->mmerror = true;
 834 }
 835
 836 //==========================================================================
 837
 838 /*
 839 ====================
 840 =
 841 = MM_FreePtr
 842 =
 843 = Allocates an unlocked, unpurgable block
 844 =
 845 ====================
 846 */
 847
 848 void MM_FreePtr(memptr *baseptr, mminfo_t *mm)
 849 {
 850         mmblocktype huge *scan,huge *last;
 851
 852         last = mm->mmhead;
 853         scan = last->next;
 854
 855         if(baseptr == mm->mmrover->useptr)      // removed the last allocated block
 856                 mm->mmrover = mm->mmhead;
 857
 858         while(scan->useptr != baseptr && scan)
 859         {
 860                 last = scan;
 861                 scan = scan->next;
 862         }
 863
 864         if(!scan)
 865         {
 866                 printf("MM_FreePtr: Block not found!\n");
 867                 return;
 868         }
 869
 870         last->next = scan->next;
 871
 872         MM_FreeBlock(scan, mm);
 873 }
 874 //==========================================================================
 875
 876 /*
 877 =====================
 878 =
 879 = MM_SetPurge
 880 =
 881 = Sets the purge level for a block (locked blocks cannot be made purgable)
 882 =
 883 =====================
 884 */
 885
 886 void MM_SetPurge(memptr *baseptr, int purge, mminfo_t *mm)
 887 {
 888         mmblocktype huge *start;
 889
 890         start = mm->mmrover;
 891
 892         do
 893         {
 894                 if(mm->mmrover->useptr == baseptr)
 895                         break;
 896
 897                 mm->mmrover = mm->mmrover->next;
 898
 899                 if(!mm->mmrover)
 900                         mm->mmrover = mm->mmhead;
 901                 else if(mm->mmrover == start)
 902                 {
 903                         printf("MM_SetPurge: Block not found!");
 904                         return;
 905                 }
 906
 907         } while(1);
 908
 909         mm->mmrover->attributes &= ~PURGEBITS;
 910         mm->mmrover->attributes |= purge;
 911 }
 912
 913 //==========================================================================
 914
 915 /*
 916 =====================
 917 =
 918 = MM_SetLock
 919 =
 920 = Locks / unlocks the block
 921 =
 922 =====================
 923 */
 924
 925 void MM_SetLock(memptr *baseptr, boolean locked, mminfo_t *mm)
 926 {
 927         mmblocktype huge *start;
 928
 929         start = mm->mmrover;
 930
 931         do
 932         {
 933                 if(mm->mmrover->useptr == baseptr)
 934                         break;
 935
 936                 mm->mmrover = mm->mmrover->next;
 937
 938                 if(!mm->mmrover)
 939                         mm->mmrover = mm->mmhead;
 940                 else if(mm->mmrover == start)
 941                 {
 942                         printf("MM_SetLock: Block not found!");
 943                         return;
 944                 }
 945
 946         } while(1);
 947
 948         mm->mmrover->attributes &= ~LOCKBIT;
 949         mm->mmrover->attributes |= locked*LOCKBIT;
 950 }
 951
 952 //==========================================================================
 953
 954 /*
 955 =====================
 956 =
 957 = MM_SortMem
 958 =
 959 = Throws out all purgable stuff and compresses movable blocks
 960 =
 961 =====================
 962 */
 963
 964 void MM_SortMem(mminfo_t *mm)
 965 {
 966         mmblocktype huge *scan,huge *last,huge *next;
 967         unsigned        start,length,source,dest,oldborder;
 968         int                     playing;
 969
 970         //
 971         // lock down a currently playing sound
 972         //
 973 /*++++  playing = SD_SoundPlaying ();
 974         if(playing)
 975         {
 976                 switch (SoundMode)
 977                 {
 978                 case sdm_PC:
 979                         playing += STARTPCSOUNDS;
 980                         break;
 981                 case sdm_AdLib:
 982                         playing += STARTADLIBSOUNDS;
 983                         break;
 984                 }
 985                 MM_SetLock(&(memptr)audiosegs[playing],true);
 986         }
 987
 988
 989         SD_StopSound();*/
 990 //      oldborder = bordercolor;
 991 //      VW_ColorBorder (15);
 992
 993         if(beforesort)
 994                 beforesort();
 995
 996         scan = mm->mmhead;
 997
 998         last = NULL;            // shut up compiler warning
 999
1000         while(scan)
1001         {
1002                 if(scan->attributes & LOCKBIT)
1003                 {
1004                 //
1005                 // block is locked, so try to pile later blocks right after it
1006                 //
1007                         start = scan->start + scan->length;
1008                 }
1009                 else
1010                 {
1011                         if(scan->attributes & PURGEBITS)
1012                         {
1013                         //
1014                         // throw out the purgable block
1015                         //
1016                                 next = scan->next;
1017                                 MM_FreeBlock(scan, mm);
1018                                 last->next = next;
1019                                 scan = next;
1020                                 continue;
1021                         }
1022                         else
1023                         {
1024                         //
1025                         // push the non purgable block on top of the last moved block
1026                         //
1027                                 if(scan->start != start)
1028                                 {
1029                                         length = scan->length;
1030                                         source = scan->start;
1031                                         dest = start;
1032                                         while(length > 0xf00)
1033                                         {
1034                                                 movedata(source,0,dest,0,0xf00*16);
1035                                                 length -= 0xf00;
1036                                                 source += 0xf00;
1037                                                 dest += 0xf00;
1038                                         }
1039                                         movedata(source,0,dest,0,length*16);
1040
1041                                         scan->start = start;
1042                                         *(unsigned *)scan->useptr = start;
1043                                 }
1044                                 start = scan->start + scan->length;
1045                         }
1046                 }
1047
1048                 last = scan;
1049                 scan = scan->next;              // go to next block
1050         }
1051
1052         mm->mmrover = mm->mmhead;
1053
1054         if(aftersort)
1055                 aftersort();
1056
1057 //      VW_ColorBorder (oldborder);
1058
1059 /*++++  if(playing)
1060                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
1061 }
1062
1063
1064 //==========================================================================
1065
1066 //****#if 0
1067 /*
1068 =====================
1069 =
1070 = MM_ShowMemory
1071 =
1072 =====================
1073 */
1074
1075 void MM_ShowMemory(page_t *page, mminfo_t *mm)
1076 {
1077         mmblocktype huge *scan;
1078         word color,temp;
1079         long    end,owner;
1080         word chx,chy;
1081         byte    scratch[160],str[16];
1082
1083 //****  VW_SetDefaultColors();
1084 //****  VW_SetLineWidth(40);
1085 //++++mh        temp = bufferofs;
1086 //++++mh        bufferofs = 0;
1087 //****  VW_SetScreen (0,0);
1088
1089         scan = mm->mmhead;
1090
1091         end = -1;
1092
1093 CA_OpenDebug ();
1094
1095         chx=0;
1096         chy=0;
1097
1098         while(scan)
1099         {
1100                 if(scan->attributes & PURGEBITS)
1101                         color = 5;              // dark purple = purgable
1102                 else
1103                         color = 9;              // medium blue = non purgable
1104                 if(scan->attributes & LOCKBIT)
1105                         color = 12;             // red = locked
1106                 if(scan->start<=end)
1107                 {
1108                         //printf(");
1109                         write(debughandle,"\nMM_ShowMemory: Memory block order currupted!\n",strlen("\nMM_ShowMemory: Memory block order currupted!\n"));
1110                         //modexprint(&page, chx, chy, 1, 0, 24, "\nMM_ShowMemory: Memory block order currupted!\n");
1111                         return;
1112                 }
1113                 end = scan->start+scan->length-1;
1114                 chy = scan->start/320;
1115                 chx = scan->start%320;
1116                                 //modexhlin(page, scan->start, (unsigned)end, chy, color);
1117                                 //for(chx=scan->start;chx+4>=(word)end;chx+=4)
1118                                 //{
1119                                         modexClearRegion(page, chx, chy, 4, 4, color);
1120                                 //}
1121
1122 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1123
1124 //++++          VW_Plot(scan->start,0,15);
1125                                 modexClearRegion(page, chx, chy, 4, 4, 15);
1126                 if(scan->next->start > end+1)
1127 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1128                         //for(chx=scan->next->start;chx+4>=(word)end+1;chx+=4)
1129                         //{
1130                                 chx+=scan->next->start;
1131                                 modexClearRegion(page, chx, chy, 4, 4, 2);
1132                         //}
1133                                         //modexhlin(page, end+1,scan->next->start, chy, 0);
1134
1135 /*
1136                 end = scan->length-1;
1137                 y = scan->start/320;
1138                 x = scan->start%320;
1139                 VW_Hlin(x,x+end,y,color);
1140                 VW_Plot(x,y,15);
1141                 if (scan->next && scan->next->start > end+1)
1142                         VW_Hlin(x+end+1,x+(scan->next->start-scan->start),y,0); // black = free
1143 */
1144
1145 //****#if 0
1146 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!
1147 strcpy(scratch,"Seg:");
1148 ultoa (scan->start,str,16);
1149 strcat (scratch,str);
1150 strcat (scratch,"\tSize:");
1151 ltoa ((dword)scan->length*16,str,10);
1152 strcat (scratch,str);
1153 strcat (scratch,"\tOwner:0x");
1154 owner = (unsigned)scan->useptr;
1155 ultoa (owner,str,16);
1156 strcat (scratch,str);
1157 strcat (scratch,"\n");
1158 write(debughandle,scratch,strlen(scratch));
1159 //modexprint(page, chx, chy, 1, 0, 24, &scratch);
1160 chy+=4;
1161 //fprintf(stdout, "%s", scratch);
1162 //****#endif
1163
1164                 scan = scan->next;
1165         }
1166
1167 CA_CloseDebug ();
1168
1169 //++++mh        IN_Ack();
1170 //****  VW_SetLineWidth(64);
1171 //++++mh        bufferofs = temp;
1172 }
1173 //****#endif
1174
1175 //==========================================================================
1176
1177 /*
1178 =====================
1179 =
1180 = MM_DumpData
1181 =
1182 =====================
1183 */
1184
1185 void MM_DumpData(mminfo_t *mm)
1186 {
1187         mmblocktype far *scan,far *best;
1188         long    lowest,oldlowest;
1189         word    owner;
1190         byte    lock,purge;
1191         FILE    *dumpfile;
1192
1193
1194         free (mm->nearheap);
1195         dumpfile = fopen ("mmdump.txt","w");
1196         if (!dumpfile){
1197                 printf("MM_DumpData: Couldn't open MMDUMP.TXT!\n");
1198                 return;
1199         }
1200
1201         lowest = -1;
1202         do
1203         {
1204                 oldlowest = lowest;
1205                 lowest = 0xffff;
1206
1207                 scan = mm->mmhead;
1208                 while (scan)
1209                 {
1210                         owner = (word)scan->useptr;
1211
1212                         if (owner && owner<lowest && owner > oldlowest)
1213                         {
1214                                 best = scan;
1215                                 lowest = owner;
1216                         }
1217
1218                         scan = scan->next;
1219                 }
1220
1221                 if (lowest != 0xffff)
1222                 {
1223                         if (best->attributes & PURGEBITS)
1224                                 purge = 'P';
1225                         else
1226                                 purge = '-';
1227                         if (best->attributes & LOCKBIT)
1228                                 lock = 'L';
1229                         else
1230                                 lock = '-';
1231                         fprintf (dumpfile,"0x%p (%c%c) = %u\n"
1232                         ,(word)lowest,lock,purge,best->length);
1233                 }
1234
1235         } while (lowest != 0xffff);
1236
1237         fclose (dumpfile);
1238         printf("MMDUMP.TXT created.\n");
1239 }
1240
1241 //==========================================================================
1242
1243
1244 /*
1245 ======================
1246 =
1247 = MM_UnusedMemory
1248 =
1249 = Returns the total free space without purging
1250 =
1251 ======================
1252 */
1253
1254 dword MM_UnusedMemory(mminfo_t *mm)
1255 {
1256         dword free;
1257         mmblocktype huge *scan;
1258
1259         free = 0;
1260         scan = mm->mmhead;
1261
1262         while(scan->next)
1263         {
1264                 free += scan->next->start - (scan->start + scan->length);
1265                 scan = scan->next;
1266         }
1267
1268         return free*16l;
1269 //      return free;
1270 }
1271
1272 //==========================================================================
1273
1274
1275 /*
1276 ======================
1277 =
1278 = MM_TotalFree
1279 =
1280 = Returns the total free space with purging
1281 =
1282 ======================
1283 */
1284
1285 dword MM_TotalFree(mminfo_t *mm)
1286 {
1287         dword free;
1288         mmblocktype huge *scan;
1289
1290         free = 0;
1291         scan = mm->mmhead;
1292
1293         while(scan->next)
1294         {
1295                 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1296                         free += scan->length;
1297                 free += scan->next->start - (scan->start + scan->length);
1298                 scan = scan->next;
1299         }
1300
1301         return free*16l;
1302 //      return free;
1303 }
1304
1305 //==========================================================================
1306
1307 /*
1308 =====================
1309 =
1310 = MM_Report
1311 =
1312 =====================
1313 */
1314
1315 void MM_Report(page_t *page, mminfo_t *mm, mminfotype *mmi)
1316 {
1317         if(MML_CheckForEMS())
1318         {
1319                 printf("EMM v%x.%x available\n", mm->EMSVer>>4,mm->EMSVer&0x0F);
1320                 printf("totalEMSpages=%u\n", mm->totalEMSpages);
1321                 printf("freeEMSpages=%u\n", mm->freeEMSpages);
1322                 printf("EMSpageframe=%x\n", mm->EMSpageframe);
1323         }
1324         if(MML_CheckForXMS(mm)) printf("XMSaddr=%Fp\n", *XMSaddr);
1325         printf("near=%lu\n", mmi->nearheap);
1326         printf("far=%lu\n", mmi->farheap);
1327         printf("EMSmem=%lu\n", mmi->EMSmem);
1328         printf("XMSmem=%lu\n", mmi->XMSmem);
1329         printf("mainmem=%lu\n", mmi->mainmem);
1330         printf("UnusedMemory=%lu\n", MM_UnusedMemory(mm));
1331         printf("TotalFree=%lu\n", MM_TotalFree(mm));
1332 //      printf("\n");
1333 //      printf("UnusedMemory=%lu kb\n", MM_UnusedMemory()/10248);
1334 //      printf("TotalFree=%lu kb\n", MM_TotalFree()/10248);
1335 }
1336
1337 //==========================================================================
1338
1339 /*
1340 =====================
1341 =
1342 = MM_EMSVer
1343 =
1344 =====================
1345
1346
1347 int MM_EMSVer(void)
1348 {
1349         int EMSver;
1350         __asm
1351         {
1352                 mov             ah,EMS_VERSION
1353                 int             EMS_INT
1354                 mov             EMSver,ax
1355         }
1356         return(EMSver);
1357 }*/
1358
1359 //==========================================================================
1360
1361 /*
1362 =====================
1363 =
1364 = MM_BombOnError
1365 =
1366 =====================
1367 */
1368
1369 void MM_BombOnError(boolean bomb, mminfo_t *mm)
1370 {
1371         mm->bombonerror = bomb;
1372 }
1373
1374 void MM_GetNewBlock(mminfo_t *mm)
1375 {
1376         if(!mm->mmfree)
1377                 MML_ClearBlock(mm);
1378         mm->mmnew=mm->mmfree;
1379         mm->mmfree=mm->mmfree->next;
1380         /*if(!(mm->mmnew=mm->mmfree))
1381         {
1382                 printf("MM_GETNEWBLOCK: No free blocks!");
1383                 return;
1384         }
1385         mm->mmfree=mm->mmfree->next;*/
1386 }
1387
1388 void MM_FreeBlock(mmblocktype *x, mminfo_t *mm)
1389 {
1390         x->useptr=NULL;
1391         x->next=mm->mmfree;
1392         mm->mmfree=x;
1393 }
1394
1395 void MM_seguin(void)
1396 {
1397         __asm
1398         {
1399                 push    ds
1400                 mov     ax,ds
1401                 inc             ax
1402                 mov     ds,ax
1403         }
1404 }
1405
1406 void MM_segude(void)
1407 {
1408         __asm
1409         {
1410                 pop ds
1411         }
1412 }
1413
1414 /*
1415 pull data from far and put it into ds var
1416 mov ax,es:si
1417 mov x,ax
1418 */
1419 /*
1420 ss stack segment
1421 sp top of stack
1422 bp bottem of stack
1423 */