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 byte MML_SetupEMS(mminfo_t *mm)
 139 {
 140         char    str[80];//,str2[10];
 141         byte    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     err,ah
 203                 mov     errorflag,1
 204                 jmp End
 205 noEMS:
 206 End:
 207         }
 208         if(errorflag==true)
 209         {
 210                 //err = CPURegs.h.ah;
 211                 strcpy(str,"MML_SetupEMS: EMS error 0x");
 212                 //itoa(err,str2,16);
 213                 //strcat(str,&err);
 214                 //printf("%s\n",str);
 215                 printf("%s%x\n",str,err);
 216                 return err;
 217         }
 218         mm->totalEMSpages=totalEMSpages;
 219         mm->freeEMSpages=freeEMSpages;
 220         mm->EMSpageframe=EMSpageframe;
 221         mm->EMSpagesmapped=EMSpagesmapped;
 222         mm->EMShandle=EMShandle;
 223         mm->EMSVer=EMSVer;
 224         return 0;
 225 }
 226
 227
 228 /*
 229 ======================
 230 =
 231 = MML_ShutdownEMS
 232 =
 233 =======================
 234 */
 235
 236 void MML_ShutdownEMS(mminfo_t *mm)
 237 {
 238         boolean errorflag=false;
 239         unsigned EMShandle=mm->EMShandle;
 240
 241         if(!EMShandle)
 242                 return;
 243         __asm
 244         {
 245                 mov     ah,EMS_FREEPAGES
 246                 mov     dx,[EMShandle]
 247                 int     EMS_INT
 248                 or      ah,ah
 249                 jz      ok
 250                 mov     errorflag,1
 251                 ok:
 252         }
 253         if(errorflag==true) printf("MML_ShutdownEMS: Error freeing EMS!");      //++++ add something
 254 }
 255
 256 /*
 257 ====================
 258 =
 259 = MM_MapEMS
 260 =
 261 = Maps the 64k of EMS used by memory manager into the page frame
 262 = for general use.  This only needs to be called if you are keeping
 263 = other things in EMS.
 264 =
 265 ====================
 266 */
 267
 268 byte MM_MapEMS(mminfo_t *mm)
 269 {
 270         char    str[80];//,str2[10];
 271         unsigned        /*err, */EMShandle;
 272         byte err;
 273         boolean errorflag=false;
 274         int     i;
 275         union REGS CPURegs;
 276         EMShandle=mm->EMShandle;
 277
 278         for (i=0;i<MAPPAGES;i++)
 279         {
 280                 __asm
 281                 {
 282                         mov     ah,EMS_MAPPAGE
 283                         mov     bx,[i]                  // logical page
 284                         mov     al,bl                   // physical page
 285                         mov     dx,[EMShandle]  // handle
 286                         int     EMS_INT
 287                         or      ah,ah
 288                         jnz     error
 289                         jmp End
 290                         error:
 291                         mov     err,ah
 292                         mov     errorflag,1
 293                         End:
 294                 }
 295                 if(errorflag==true)
 296                 {
 297                         //err = CPURegs.h.ah;
 298                         strcpy(str,"MM_MapEMS: EMS error 0x");
 299                         //itoa(err,str2,16);
 300                         //strcat(str,&err);
 301                         //printf("%s\n",str);
 302                         printf("%s%x\n",str, err);
 303                         //printf("FACK! %x\n", err);
 304                         return err;
 305                 }
 306         }
 307         return 0;
 308 }
 309
 310 byte MM_MapXEMS(mminfo_t *mm)
 311 {
 312
 313 //SUB EMS.MapXPages (PhysicalStart, LogicalStart, NumPages, Handle)\r
 314 \r
 315         //Maps up to 4 logical EMS pages to physical pages in the page frame, where:\r
 316         //PhysicalStart = Physical page first logical page is mapped to\r
 317         //LogicalStart  = First logical page to map\r
 318         //NumPages      = Number of pages to map (1 to 4)\r
 319         //Handle        = EMS handle logical pages are allocated to\r
 320 \r
 321   /*//Create a buffer containing the page information\r
 322 //  FOR x = 0 TO NumPages - 1\r
 323 //    MapInfo$ = MapInfo$ + MKI$(LogicalStart + x) + MKI$(PhysicalStart + x)\r
 324 //  NEXT*/\r
 325 \r
 326 //  Regs.ax = &H5000                           //Map the pages in the buffer\r
 327 //  Regs.cx = NumPages                         //to the pageframe\r
 328 //  Regs.dx = Handle\r
 329 //  Regs.ds = VARSEG(MapInfo$)\r
 330 //  Regs.si = SADD(MapInfo$)\r
 331 //  InterruptX &H67, Regs, Regs\r
 332 //      EMS.Error = (Regs.ax AND &HFF00&) \ &H100  //Store the status code\r
 333 \r
 334 //END SUB
 335 /*
 336 char    str[80];//,str2[10];
 337         unsigned        EMShandle;
 338         byte err;
 339         boolean errorflag=false;
 340         int     i;
 341         union REGS CPURegs;
 342         EMShandle=mm->EMShandle;
 343
 344         for (i=0;i<MAPPAGES;i++)
 345         {
 346                 __asm
 347                 {
 348                         mov     ah,EMS_MAPPAGE
 349                         mov     bx,[i]                  // logical page
 350                         mov     al,bl                   // physical page
 351                         mov     dx,[EMShandle]  // handle
 352                         int     EMS_INT
 353                         or      ah,ah
 354                         jnz     error
 355                         jmp End
 356                         error:
 357                         mov     err,ah
 358                         mov     errorflag,1
 359                         End:
 360                 }
 361                 if(errorflag==true)
 362                 {
 363                         //err = CPURegs.h.ah;
 364                         strcpy(str,"MM_MapEMS: EMS error 0x");
 365                         //itoa(err,str2,16);
 366                         //strcat(str,&err);
 367                         //printf("%s\n",str);
 368                         printf("%s%x\n",str, err);
 369                         //printf("FACK! %x\n", err);
 370                         return err;
 371                 }
 372         }
 373         return 0;
 374 */
 375         return 0;
 376 }
 377
 378 //==========================================================================
 379
 380 /*
 381 ======================
 382 =
 383 = MML_CheckForXMS
 384 =
 385 = Check for XMM driver
 386 =
 387 =======================
 388 */
 389
 390 boolean MML_CheckForXMS(mminfo_t *mm)
 391 {
 392         boolean errorflag=false;
 393         mm->numUMBs = 0;
 394
 395         __asm
 396         {
 397                 mov     ax,0x4300
 398                 int     0x2f                            // query status of installed diver
 399                 cmp     al,0x80
 400                 je      good
 401                 mov     errorflag,1
 402                 good:
 403         }
 404         if(errorflag==true) return false;
 405         else return true;
 406 }
 407
 408
 409 /*
 410 ======================
 411 =
 412 = MML_SetupXMS
 413 =
 414 = Try to allocate all upper memory block
 415 =
 416 =======================
 417 */
 418
 419 void MML_SetupXMS(mminfo_t *mm, mminfotype *mmi)
 420 {
 421         unsigned        base,size;
 422
 423 getmemory:
 424         __asm
 425         {
 426                 mov     ax,0x4310
 427                 int     0x2f
 428                 mov     [WORD PTR XMSaddr],bx
 429                 mov     [WORD PTR XMSaddr+2],es         // function pointer to XMS driver
 430
 431                 mov     ah,XMS_ALLOCUMB
 432                 mov     dx,0xffff                                       // try for largest block possible
 433                 //mov     ax,dx                                         // Set available Kbytes.
 434                 call    [DWORD PTR XMSaddr]
 435                 or      ax,ax
 436                 jnz     gotone
 437
 438                 cmp     bl,0xb0                                         // error: smaller UMB is available
 439                 jne     done;
 440
 441                 mov     ah,XMS_ALLOCUMB
 442                 call    [DWORD PTR XMSaddr]             // DX holds largest available UMB
 443                 or      ax,ax
 444                 jz      done                                            // another error...
 445
 446 gotone:
 447                 mov     [base],bx
 448                 mov     [size],dx
 449 done:
 450         }
 451         printf("base=%u ", base); printf("size=%u\n", size);
 452         MML_UseSpace(base,size, mm);
 453         mmi->XMSmem += size*16;
 454         mm->UMBbase[mm->numUMBs] = base;
 455         mm->numUMBs++;
 456         if(mm->numUMBs < MAXUMBS)
 457                 goto getmemory;
 458 }
 459
 460
 461 /*
 462 ======================
 463 =
 464 = MML_ShutdownXMS
 465 =
 466 ======================
 467 */
 468
 469 void MML_ShutdownXMS(mminfo_t *mm)
 470 {
 471         int     i;
 472         unsigned        base;
 473
 474         for (i=0;i<mm->numUMBs;i++)
 475         {
 476                 base = mm->UMBbase[i];
 477                 __asm
 478                 {
 479                         mov     ah,XMS_FREEUMB
 480                         mov     dx,[base]
 481                         call    [DWORD PTR XMSaddr]
 482                 }
 483         }
 484 }
 485
 486 //==========================================================================
 487
 488 /*
 489 ======================
 490 =
 491 = MML_UseSpace
 492 =
 493 = Marks a range of paragraphs as usable by the memory manager
 494 = This is used to mark space for the near heap, far heap, ems page frame,
 495 = and upper memory blocks
 496 =
 497 ======================
 498 */
 499
 500 void MML_UseSpace(/*d*/word segstart, dword seglength, mminfo_t *mm)
 501 {
 502         mmblocktype huge *scan,huge *last;
 503         //word          segm;
 504         dword   oldend;
 505         dword           extra;
 506
 507         scan = last = mm->mmhead;
 508         mm->mmrover = mm->mmhead;               // reset rover to start of memory
 509
 510 //
 511 // search for the block that contains the range of segments
 512 //
 513         while(scan->start+scan->length < segstart)
 514         {
 515                 last = scan;
 516                 scan = scan->next;
 517         }
 518
 519         //find out how many blocks it spans!
 520         if(seglength>0xffffu)
 521         {
 522 //              scan->segm=seglength/0x4000u;
 523                 scan->segm=seglength/0xffffu;
 524         }
 525         else scan->segm=1;
 526
 527         //++++emsver stuff!
 528         if(scan->segm>1/*extra>0xfffflu*/)
 529         {
 530                 /*__asm
 531                 {
 532                         push    ds
 533                         mov     ax,ds
 534                         inc             ax
 535                         mov     ds,ax
 536                 }*/
 537
 538
 539 //MML_UseSpace(?segstart?, ?length?, mm);
 540
 541                 /*__asm
 542                 {
 543                         pop ds
 544                 }*/
 545                 //printf("MML_UseSpace: Segment spans two blocks!\n");
 546         }
 547
 548 //
 549 // take the given range out of the block
 550 //
 551         oldend = scan->start + scan->length;
 552         extra = oldend - (segstart+seglength);
 553
 554 printf("segm=%u ", scan->segm);
 555 printf("ex=%lu  ", extra);
 556 printf("start+seglen=%lu        ", segstart+seglength);
 557 printf("len=%u  ", scan->length);
 558 printf("segsta=%x       ", segstart);
 559 printf("seglen=%lu\n", seglength);
 560
 561 //segu:
 562 //++++todo: linked list of segment!
 563 //printf("segm=%lu\n", segm);
 564         if(segstart == scan->start)
 565         {
 566                 last->next = scan->next;                        // unlink block
 567                 MM_FreeBlock(scan, mm);
 568                 scan = last;
 569         }
 570         else
 571                 scan->length = segstart-scan->start;    // shorten block
 572
 573 //      segm--;
 574
 575         if(extra > 0)
 576         {
 577                 MM_GetNewBlock(mm);
 578                 mm->mmnew->next = scan->next;
 579                 scan->next = mm->mmnew;
 580                 mm->mmnew->start = segstart+seglength;
 581                 mm->mmnew->length = extra;
 582                 mm->mmnew->attributes = LOCKBIT;
 583         }//else if(segm>0) goto segu;
 584
 585 }
 586
 587 //==========================================================================
 588
 589 /*
 590 ====================
 591 =
 592 = MML_ClearBlock
 593 =
 594 = We are out of blocks, so free a purgable block
 595 =
 596 ====================
 597 */
 598
 599 void MML_ClearBlock(mminfo_t *mm)
 600 {
 601         mmblocktype huge *scan,huge *last;
 602
 603         scan = mm->mmhead->next;
 604
 605         while(scan)
 606         {
 607                 if(!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS))
 608                 {
 609                         MM_FreePtr(scan->useptr, mm);
 610                         return;
 611                 }
 612                 scan = scan->next;
 613         }
 614
 615         printf("MM_ClearBlock: No purgable blocks!\n");
 616 }
 617
 618
 619 //==========================================================================
 620
 621 /*
 622 ===================
 623 =
 624 = MM_Startup
 625 =
 626 = Grabs all space from turbo with malloc/farmalloc
 627 = Allocates bufferseg misc buffer
 628 =
 629 ===================
 630 */
 631
 632 void MM_Startup(mminfo_t *mm, mminfotype *mmi)
 633 {
 634         int i;
 635         dword length;
 636         void huge       *start;
 637         unsigned        segstart,seglength,endfree;
 638
 639         if(mm->mmstarted)
 640                 MM_Shutdown(mm);
 641
 642         mm->mmstarted = true;
 643         mm->bombonerror = true;
 644 //
 645 // set up the linked list (everything in the free list;
 646 //
 647         mm->mmhead = NULL;
 648         mm->mmfree = &(mm->mmblocks[0]);
 649         for(i=0;i<MAXBLOCKS-1;i++)
 650         {
 651                 mm->mmblocks[i].next = &(mm->mmblocks[i+1]);
 652         }
 653         mm->mmblocks[i].next = NULL;
 654
 655 //
 656 // locked block of all memory until we punch out free space
 657 //
 658         MM_GetNewBlock(mm);
 659         mm->mmhead = mm->mmnew;                         // this will allways be the first node
 660         mm->mmnew->start = 0;
 661         mm->mmnew->length = 0xffff;
 662         mm->mmnew->attributes = LOCKBIT;
 663         mm->mmnew->next = NULL;
 664         mm->mmrover = mm->mmhead;
 665
 666 //      farlen=_bios_memsize()*1024;
 667
 668 //
 669 // get all available near conventional memory segments
 670 //
 671 //----  length=coreleft();
 672         _nheapgrow();
 673         length=_memavl();
 674         start = (void huge *)(mm->nearheap = malloc(length));
 675         length -= 16-(FP_OFF(start)&15);
 676         length -= SAVENEARHEAP;
 677         seglength = length / 16;                        // now in paragraphs
 678         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 679         MML_UseSpace(segstart,seglength, mm);
 680         mmi->nearheap = length;
 681         //printf("near heap ok!\n");
 682
 683 //
 684 // get all available far conventional memory segments
 685 //
 686 //----  length=farcoreleft();
 687         _fheapgrow();
 688         length=_memavl();
 689         start = mm->farheap = halloc(length, sizeof(byte));
 690         //start = mm->farheap = _fmalloc(length);
 691         length -= 16-(FP_OFF(start)&15);
 692         length -= SAVEFARHEAP;
 693         seglength = length / 16;                        // now in paragraphs
 694         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 695         MML_UseSpace(segstart,seglength, mm);
 696         mmi->farheap = length;
 697         mmi->mainmem = mmi->nearheap + mmi->farheap;
 698         //printf("far heap ok!\n");
 699
 700
 701 //
 702 // detect EMS and allocate up to 64K at page frame
 703 //
 704         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!
 705         mmi->EMSmem = 0;
 706         for(i = 1;i < __argc;i++)
 707         {
 708                 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 709                         goto emsskip;                           // param NOEMS
 710         }
 711         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!
 712         if(MML_CheckForEMS())
 713         {
 714 printf("EMS1\n");
 715                 MML_SetupEMS(mm);                                       // allocate space
 716 printf("EMS2\n");
 717                 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!
 718                 //TODO: EMS4! AND EMS 3.2 MASSIVE DATA HANDLMENT!
 719                 MML_UseSpace(mm->EMSpageframe,(MAPPAGES)*0x4000lu, mm);
 720 printf("EMS3\n");
 721                 MM_MapEMS(mm);                                  // map in used pages
 722 printf("EMS4\n");
 723                 mmi->EMSmem = (MAPPAGES)*0x4000lu;
 724         }
 725
 726 //
 727 // detect XMS and get upper memory blocks
 728 //
 729 emsskip:
 730         mmi->XMSmem = 0;
 731         for(i = 1;i < __argc;i++)
 732         {
 733                 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 734                         goto xmsskip;                           // param NOXMS
 735         }
 736         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!
 737         if(MML_CheckForXMS(mm))
 738         {
 739                 printf("XMS!\n");
 740                 //MML_SetupXMS(mm, mmi);                                        // allocate as many UMBs as possible
 741         }
 742
 743 //
 744 // allocate the misc buffer
 745 //
 746 xmsskip:
 747         mm->mmrover = mm->mmhead;               // start looking for space after low block
 748
 749         MM_GetPtr(&(mm->bufferseg),BUFFERSIZE, mm, mmi);
 750 }
 751
 752 //==========================================================================
 753
 754 /*
 755 ====================
 756 =
 757 = MM_Shutdown
 758 =
 759 = Frees all conventional, EMS, and XMS allocated
 760 =
 761 ====================
 762 */
 763
 764 void MM_Shutdown(mminfo_t *mm)
 765 {
 766         if(!(mm->mmstarted))
 767                 return;
 768
 769         _ffree(mm->farheap);
 770         printf("far freed\n");
 771         free(mm->nearheap);
 772         printf("near freed\n");
 773         //hfree(mm->hugeheap);
 774         //printf("huge freed\n");
 775         if(MML_CheckForEMS()){ MML_ShutdownEMS(mm); printf("EMS freed\n"); }
 776         if(MML_CheckForXMS(mm)){ MML_ShutdownXMS(mm); printf("XMS freed\n"); }
 777 }
 778
 779 //==========================================================================
 780
 781 /*
 782 ====================
 783 =
 784 = MM_GetPtr
 785 =
 786 = Allocates an unlocked, unpurgable block
 787 =
 788 ====================
 789 */
 790
 791 void MM_GetPtr(memptr *baseptr,dword size, mminfo_t *mm, mminfotype *mmi)
 792 {
 793         mmblocktype huge *scan,huge *lastscan,huge *endscan,huge *purge,huge *next;
 794         int                     search;
 795         unsigned        needed,startseg;
 796
 797         needed = (size+15)/16;          // convert size from bytes to paragraphs
 798
 799         MM_GetNewBlock(mm);                             // fill in start and next after a spot is found
 800         mm->mmnew->length = needed;
 801         mm->mmnew->useptr = baseptr;
 802         mm->mmnew->attributes = BASEATTRIBUTES;
 803
 804         for(search = 0; search<3; search++)
 805         {
 806         //
 807         // first search:        try to allocate right after the rover, then on up
 808         // second search:       search from the head pointer up to the rover
 809         // third search:        compress memory, then scan from start
 810                 if(search == 1 && mm->mmrover == mm->mmhead)
 811                         search++;
 812
 813                 switch(search)
 814                 {
 815                 case 0:
 816                         lastscan = mm->mmrover;
 817                         scan = mm->mmrover->next;
 818                         endscan = NULL;
 819                         break;
 820                 case 1:
 821                         lastscan = mm->mmhead;
 822                         scan = mm->mmhead->next;
 823                         endscan = mm->mmrover;
 824                         break;
 825                 case 2:
 826                         MM_SortMem(mm);
 827                         lastscan = mm->mmhead;
 828                         scan = mm->mmhead->next;
 829                         endscan = NULL;
 830                         break;
 831                 }
 832
 833                 startseg = lastscan->start + lastscan->length;
 834
 835                 while(scan != endscan)
 836                 {
 837                         if(scan->start - startseg >= needed)
 838                         {
 839                         //
 840                         // got enough space between the end of lastscan and
 841                         // the start of scan, so throw out anything in the middle
 842                         // and allocate the new block
 843                         //
 844                                 purge = lastscan->next;
 845                                 lastscan->next = mm->mmnew;
 846                                 mm->mmnew->start = *(unsigned *)baseptr = startseg;
 847                                 mm->mmnew->next = scan;
 848                                 while(purge != scan)
 849                                 {       // free the purgable block
 850                                         next = purge->next;
 851                                         MM_FreeBlock(purge, mm);
 852                                         purge = next;           // purge another if not at scan
 853                                 }
 854                                 mm->mmrover = mm->mmnew;
 855                                 return; // good allocation!
 856                         }
 857
 858                         //
 859                         // if this block is purge level zero or locked, skip past it
 860                         //
 861                         if((scan->attributes & LOCKBIT)
 862                                 || !(scan->attributes & PURGEBITS) )
 863                         {
 864                                 lastscan = scan;
 865                                 startseg = lastscan->start + lastscan->length;
 866                         }
 867
 868
 869                         scan=scan->next;                // look at next line
 870                 }
 871         }
 872
 873         if (mm->bombonerror)
 874                 printf(OUT_OF_MEM_MSG,(size-mmi->nearheap));
 875         else
 876                 mm->mmerror = true;
 877 }
 878
 879 //==========================================================================
 880
 881 /*
 882 ====================
 883 =
 884 = MM_FreePtr
 885 =
 886 = Allocates an unlocked, unpurgable block
 887 =
 888 ====================
 889 */
 890
 891 void MM_FreePtr(memptr *baseptr, mminfo_t *mm)
 892 {
 893         mmblocktype huge *scan,huge *last;
 894
 895         last = mm->mmhead;
 896         scan = last->next;
 897
 898         if(baseptr == mm->mmrover->useptr)      // removed the last allocated block
 899                 mm->mmrover = mm->mmhead;
 900
 901         while(scan->useptr != baseptr && scan)
 902         {
 903                 last = scan;
 904                 scan = scan->next;
 905         }
 906
 907         if(!scan)
 908         {
 909                 printf("MM_FreePtr: Block not found!\n");
 910                 return;
 911         }
 912
 913         last->next = scan->next;
 914
 915         MM_FreeBlock(scan, mm);
 916 }
 917 //==========================================================================
 918
 919 /*
 920 =====================
 921 =
 922 = MM_SetPurge
 923 =
 924 = Sets the purge level for a block (locked blocks cannot be made purgable)
 925 =
 926 =====================
 927 */
 928
 929 void MM_SetPurge(memptr *baseptr, int purge, mminfo_t *mm)
 930 {
 931         mmblocktype huge *start;
 932
 933         start = mm->mmrover;
 934
 935         do
 936         {
 937                 if(mm->mmrover->useptr == baseptr)
 938                         break;
 939
 940                 mm->mmrover = mm->mmrover->next;
 941
 942                 if(!mm->mmrover)
 943                         mm->mmrover = mm->mmhead;
 944                 else if(mm->mmrover == start)
 945                 {
 946                         printf("MM_SetPurge: Block not found!");
 947                         return;
 948                 }
 949
 950         } while(1);
 951
 952         mm->mmrover->attributes &= ~PURGEBITS;
 953         mm->mmrover->attributes |= purge;
 954 }
 955
 956 //==========================================================================
 957
 958 /*
 959 =====================
 960 =
 961 = MM_SetLock
 962 =
 963 = Locks / unlocks the block
 964 =
 965 =====================
 966 */
 967
 968 void MM_SetLock(memptr *baseptr, boolean locked, mminfo_t *mm)
 969 {
 970         mmblocktype huge *start;
 971
 972         start = mm->mmrover;
 973
 974         do
 975         {
 976                 if(mm->mmrover->useptr == baseptr)
 977                         break;
 978
 979                 mm->mmrover = mm->mmrover->next;
 980
 981                 if(!mm->mmrover)
 982                         mm->mmrover = mm->mmhead;
 983                 else if(mm->mmrover == start)
 984                 {
 985                         printf("MM_SetLock: Block not found!");
 986                         return;
 987                 }
 988
 989         } while(1);
 990
 991         mm->mmrover->attributes &= ~LOCKBIT;
 992         mm->mmrover->attributes |= locked*LOCKBIT;
 993 }
 994
 995 //==========================================================================
 996
 997 /*
 998 =====================
 999 =
1000 = MM_SortMem
1001 =
1002 = Throws out all purgable stuff and compresses movable blocks
1003 =
1004 =====================
1005 */
1006
1007 void MM_SortMem(mminfo_t *mm)
1008 {
1009         mmblocktype huge *scan,huge *last,huge *next;
1010         unsigned        start,length,source,dest,oldborder;
1011         int                     playing;
1012
1013         //
1014         // lock down a currently playing sound
1015         //
1016 /*++++  playing = SD_SoundPlaying ();
1017         if(playing)
1018         {
1019                 switch (SoundMode)
1020                 {
1021                 case sdm_PC:
1022                         playing += STARTPCSOUNDS;
1023                         break;
1024                 case sdm_AdLib:
1025                         playing += STARTADLIBSOUNDS;
1026                         break;
1027                 }
1028                 MM_SetLock(&(memptr)audiosegs[playing],true);
1029         }
1030
1031
1032         SD_StopSound();*/
1033 //      oldborder = bordercolor;
1034 //      VW_ColorBorder (15);
1035
1036         if(beforesort)
1037                 beforesort();
1038
1039         scan = mm->mmhead;
1040
1041         last = NULL;            // shut up compiler warning
1042
1043         while(scan)
1044         {
1045                 if(scan->attributes & LOCKBIT)
1046                 {
1047                 //
1048                 // block is locked, so try to pile later blocks right after it
1049                 //
1050                         start = scan->start + scan->length;
1051                 }
1052                 else
1053                 {
1054                         if(scan->attributes & PURGEBITS)
1055                         {
1056                         //
1057                         // throw out the purgable block
1058                         //
1059                                 next = scan->next;
1060                                 MM_FreeBlock(scan, mm);
1061                                 last->next = next;
1062                                 scan = next;
1063                                 continue;
1064                         }
1065                         else
1066                         {
1067                         //
1068                         // push the non purgable block on top of the last moved block
1069                         //
1070                                 if(scan->start != start)
1071                                 {
1072                                         length = scan->length;
1073                                         source = scan->start;
1074                                         dest = start;
1075                                         while(length > 0xf00)
1076                                         {
1077                                                 movedata(source,0,dest,0,0xf00*16);
1078                                                 length -= 0xf00;
1079                                                 source += 0xf00;
1080                                                 dest += 0xf00;
1081                                         }
1082                                         movedata(source,0,dest,0,length*16);
1083
1084                                         scan->start = start;
1085                                         *(unsigned *)scan->useptr = start;
1086                                 }
1087                                 start = scan->start + scan->length;
1088                         }
1089                 }
1090
1091                 last = scan;
1092                 scan = scan->next;              // go to next block
1093         }
1094
1095         mm->mmrover = mm->mmhead;
1096
1097         if(aftersort)
1098                 aftersort();
1099
1100 //      VW_ColorBorder (oldborder);
1101
1102 /*++++  if(playing)
1103                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
1104 }
1105
1106
1107 //==========================================================================
1108
1109 //****#if 0
1110 /*
1111 =====================
1112 =
1113 = MM_ShowMemory
1114 =
1115 =====================
1116 */
1117
1118 void MM_ShowMemory(page_t *page, mminfo_t *mm)
1119 {
1120         mmblocktype huge *scan;
1121         word color,temp;
1122         long    end,owner;
1123         word chx,chy;
1124         byte    scratch[160],str[16];
1125
1126 //****  VW_SetDefaultColors();
1127 //****  VW_SetLineWidth(40);
1128 //++++mh        temp = bufferofs;
1129 //++++mh        bufferofs = 0;
1130 //****  VW_SetScreen (0,0);
1131
1132         scan = mm->mmhead;
1133
1134         end = -1;
1135
1136 CA_OpenDebug ();
1137
1138         chx=0;
1139         chy=0;
1140
1141         while(scan)
1142         {
1143                 if(scan->attributes & PURGEBITS)
1144                         color = 5;              // dark purple = purgable
1145                 else
1146                         color = 9;              // medium blue = non purgable
1147                 if(scan->attributes & LOCKBIT)
1148                         color = 12;             // red = locked
1149                 if(scan->start<=end)
1150                 {
1151                         //printf(");
1152                         write(debughandle,"\nMM_ShowMemory: Memory block order currupted!\n",strlen("\nMM_ShowMemory: Memory block order currupted!\n"));
1153                         //modexprint(&page, chx, chy, 1, 0, 24, "\nMM_ShowMemory: Memory block order currupted!\n");
1154                         return;
1155                 }
1156                 end = scan->start+scan->length-1;
1157                 chy = scan->start/320;
1158                 chx = scan->start%320;
1159                                 //modexhlin(page, scan->start, (unsigned)end, chy, color);
1160                                 //for(chx=scan->start;chx+4>=(word)end;chx+=4)
1161                                 //{
1162                                         modexClearRegion(page, chx, chy, 4, 4, color);
1163                                 //}
1164
1165 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1166
1167 //++++          VW_Plot(scan->start,0,15);
1168                                 modexClearRegion(page, chx, chy, 4, 4, 15);
1169                 if(scan->next->start > end+1)
1170 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1171                         //for(chx=scan->next->start;chx+4>=(word)end+1;chx+=4)
1172                         //{
1173                                 chx+=scan->next->start;
1174                                 modexClearRegion(page, chx, chy, 4, 4, 2);
1175                         //}
1176                                         //modexhlin(page, end+1,scan->next->start, chy, 0);
1177
1178 /*
1179                 end = scan->length-1;
1180                 y = scan->start/320;
1181                 x = scan->start%320;
1182                 VW_Hlin(x,x+end,y,color);
1183                 VW_Plot(x,y,15);
1184                 if (scan->next && scan->next->start > end+1)
1185                         VW_Hlin(x+end+1,x+(scan->next->start-scan->start),y,0); // black = free
1186 */
1187
1188 //****#if 0
1189 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!
1190 strcpy(scratch,"Seg:");
1191 ultoa (scan->start,str,16);
1192 strcat (scratch,str);
1193 strcat (scratch,"\tSize:");
1194 ltoa ((dword)scan->length*16,str,10);
1195 strcat (scratch,str);
1196 strcat (scratch,"\tOwner:0x");
1197 owner = (unsigned)scan->useptr;
1198 ultoa (owner,str,16);
1199 strcat (scratch,str);
1200 strcat (scratch,"\n");
1201 write(debughandle,scratch,strlen(scratch));
1202 //modexprint(page, chx, chy, 1, 0, 24, &scratch);
1203 chy+=4;
1204 //fprintf(stdout, "%s", scratch);
1205 //****#endif
1206
1207                 scan = scan->next;
1208         }
1209
1210 CA_CloseDebug ();
1211
1212 //++++mh        IN_Ack();
1213 //****  VW_SetLineWidth(64);
1214 //++++mh        bufferofs = temp;
1215 }
1216 //****#endif
1217
1218 //==========================================================================
1219
1220 /*
1221 =====================
1222 =
1223 = MM_DumpData
1224 =
1225 =====================
1226 */
1227
1228 void MM_DumpData(mminfo_t *mm)
1229 {
1230         mmblocktype far *scan,far *best;
1231         long    lowest,oldlowest;
1232         word    owner;
1233         byte    lock,purge;
1234         FILE    *dumpfile;
1235
1236
1237         free (mm->nearheap);
1238         dumpfile = fopen ("mmdump.txt","w");
1239         if (!dumpfile){
1240                 printf("MM_DumpData: Couldn't open MMDUMP.TXT!\n");
1241                 return;
1242         }
1243
1244         lowest = -1;
1245         do
1246         {
1247                 oldlowest = lowest;
1248                 lowest = 0xffff;
1249
1250                 scan = mm->mmhead;
1251                 while (scan)
1252                 {
1253                         owner = (word)scan->useptr;
1254
1255                         if (owner && owner<lowest && owner > oldlowest)
1256                         {
1257                                 best = scan;
1258                                 lowest = owner;
1259                         }
1260
1261                         scan = scan->next;
1262                 }
1263
1264                 if (lowest != 0xffff)
1265                 {
1266                         if (best->attributes & PURGEBITS)
1267                                 purge = 'P';
1268                         else
1269                                 purge = '-';
1270                         if (best->attributes & LOCKBIT)
1271                                 lock = 'L';
1272                         else
1273                                 lock = '-';
1274                         fprintf (dumpfile,"0x%p (%c%c) = %u\n"
1275                         ,(word)lowest,lock,purge,best->length);
1276                 }
1277
1278         } while (lowest != 0xffff);
1279
1280         fclose (dumpfile);
1281         printf("MMDUMP.TXT created.\n");
1282 }
1283
1284 //==========================================================================
1285
1286
1287 /*
1288 ======================
1289 =
1290 = MM_UnusedMemory
1291 =
1292 = Returns the total free space without purging
1293 =
1294 ======================
1295 */
1296
1297 dword MM_UnusedMemory(mminfo_t *mm)
1298 {
1299         dword free;
1300         mmblocktype huge *scan;
1301
1302         free = 0;
1303         scan = mm->mmhead;
1304
1305         while(scan->next)
1306         {
1307                 free += scan->next->start - (scan->start + scan->length);
1308                 scan = scan->next;
1309         }
1310
1311         return free*16l;
1312 //      return free;
1313 }
1314
1315 //==========================================================================
1316
1317
1318 /*
1319 ======================
1320 =
1321 = MM_TotalFree
1322 =
1323 = Returns the total free space with purging
1324 =
1325 ======================
1326 */
1327
1328 dword MM_TotalFree(mminfo_t *mm)
1329 {
1330         dword free;
1331         mmblocktype huge *scan;
1332
1333         free = 0;
1334         scan = mm->mmhead;
1335
1336         while(scan->next)
1337         {
1338                 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1339                         free += scan->length;
1340                 free += scan->next->start - (scan->start + scan->length);
1341                 scan = scan->next;
1342         }
1343
1344         return free*16l;
1345 //      return free;
1346 }
1347
1348 //==========================================================================
1349
1350 /*
1351 =====================
1352 =
1353 = MM_Report
1354 =
1355 =====================
1356 */
1357
1358 void MM_Report(page_t *page, mminfo_t *mm, mminfotype *mmi)
1359 {
1360         if(MML_CheckForEMS())
1361         {
1362                 printf("EMM v%x.%x available\n", mm->EMSVer>>4,mm->EMSVer&0x0F);
1363                 printf("totalEMSpages=%u\n", mm->totalEMSpages);
1364                 printf("freeEMSpages=%u\n", mm->freeEMSpages);
1365                 printf("EMSpageframe=%x\n", mm->EMSpageframe);
1366         }
1367         if(MML_CheckForXMS(mm)) printf("XMSaddr=%Fp\n", *XMSaddr);
1368         printf("near=%lu\n", mmi->nearheap);
1369         printf("far=%lu\n", mmi->farheap);
1370         printf("EMSmem=%lu\n", mmi->EMSmem);
1371         printf("XMSmem=%lu\n", mmi->XMSmem);
1372         printf("mainmem=%lu\n", mmi->mainmem);
1373         printf("UnusedMemory=%lu\n", MM_UnusedMemory(mm));
1374         printf("TotalFree=%lu\n", MM_TotalFree(mm));
1375 //      printf("\n");
1376 //      printf("UnusedMemory=%lu kb\n", MM_UnusedMemory()/10248);
1377 //      printf("TotalFree=%lu kb\n", MM_TotalFree()/10248);
1378 }
1379
1380 //==========================================================================
1381
1382 /*
1383 =====================
1384 =
1385 = MM_EMSVer
1386 =
1387 =====================
1388
1389
1390 int MM_EMSVer(void)
1391 {
1392         int EMSver;
1393         __asm
1394         {
1395                 mov             ah,EMS_VERSION
1396                 int             EMS_INT
1397                 mov             EMSver,ax
1398         }
1399         return(EMSver);
1400 }*/
1401
1402 //==========================================================================
1403
1404 /*
1405 =====================
1406 =
1407 = MM_BombOnError
1408 =
1409 =====================
1410 */
1411
1412 void MM_BombOnError(boolean bomb, mminfo_t *mm)
1413 {
1414         mm->bombonerror = bomb;
1415 }
1416
1417 void MM_GetNewBlock(mminfo_t *mm)
1418 {
1419         if(!mm->mmfree)
1420                 MML_ClearBlock(mm);
1421         mm->mmnew=mm->mmfree;
1422         mm->mmfree=mm->mmfree->next;
1423         /*if(!(mm->mmnew=mm->mmfree))
1424         {
1425                 printf("MM_GETNEWBLOCK: No free blocks!");
1426                 return;
1427         }
1428         mm->mmfree=mm->mmfree->next;*/
1429 }
1430
1431 void MM_FreeBlock(mmblocktype *x, mminfo_t *mm)
1432 {
1433         x->useptr=NULL;
1434         x->next=mm->mmfree;
1435         mm->mmfree=x;
1436 }
1437
1438 void MM_seguin(void)
1439 {
1440         __asm
1441         {
1442                 push    ds
1443                 mov     ax,ds
1444                 inc             ax
1445                 mov     ds,ax
1446         }
1447 }
1448
1449 void MM_segude(void)
1450 {
1451         __asm
1452         {
1453                 pop ds
1454         }
1455 }
1456
1457 /*
1458 pull data from far and put it into ds var
1459 mov ax,es:si
1460 mov x,ax
1461 */
1462 /*
1463 ss stack segment
1464 sp top of stack
1465 bp bottem of stack
1466 */