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