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
 144         unsigned int EMSVer = 0;
 145         //byte  EMS_status;
 146         unsigned        totalEMSpages,freeEMSpages,EMSpageframe,EMSpagesmapped,EMShandle;
 147         totalEMSpages = freeEMSpages = EMSpageframe = EMSpagesmapped = 0;
 148
 149         __asm
 150                 {
 151                 mov     ah,EMS_STATUS
 152                 int     EMS_INT                                         // make sure EMS hardware is present
 153                 or      ah,ah
 154                 //mov   [EMS_status],ah
 155                 jnz     error
 156
 157                 mov     ah,EMS_VERSION
 158                 int     EMS_INT
 159                 or      ah,ah
 160                 jnz     error
 161                 mov     [EMSVer],ax                             //      set EMSVer
 162                 cmp     al,0x32                                         // only work on ems 3.2 or greater
 163                 jb      error
 164
 165                 mov     ah,EMS_GETFRAME
 166                 int     EMS_INT                                         // find the page frame address
 167                 or      ah,ah
 168                 jnz     error
 169                 mov     [EMSpageframe],bx
 170
 171                 mov     ah,EMS_GETPAGES
 172                 int     EMS_INT                                         // find out how much EMS is there
 173                 or      ah,ah
 174                 jnz     error
 175                 mov     [totalEMSpages],dx
 176                 mov     [freeEMSpages],bx
 177                 or      bx,bx
 178                 jz      noEMS                                           // no EMS at all to allocate
 179                                                                                         //EXPAND DONG!!!!
 180                 cmp     [EMSVer],0x40
 181                 jb      low
 182                 cmp     bx,[freeEMSpages]
 183                 jle     getpages
 184                 mov     bx,[freeEMSpages]
 185                 jmp     getpages
 186
 187 low:
 188                 cmp     bx,4
 189                 jle     getpages                                        // there is only 1,2,3,or 4 pages
 190                 mov     bx,4                                            // we can't use more than 4 pages
 191
 192 getpages:
 193                 mov     [EMSpagesmapped],bx
 194                 mov     ah,EMS_ALLOCPAGES                       // allocate up to 64k of EMS
 195                 int     EMS_INT
 196                 or      ah,ah
 197                 jnz     error
 198                 mov     [EMShandle],dx
 199                 jmp End
 200 error:
 201                 mov     err,ah
 202                 mov     errorflag,1
 203                 jmp End
 204 noEMS:
 205 End:
 206         }
 207         if(errorflag==true)
 208         {
 209                 //err = CPURegs.h.ah;
 210                 strcpy(str,"MM_SetupEMS: EMS error");
 211                 //itoa(err,str2,16);
 212                 strcat(str,MM_EMSerr(err));
 213                 printf("%s\n",str);
 214                 return err;
 215         }
 216         mm->totalEMSpages=totalEMSpages;
 217         mm->freeEMSpages=freeEMSpages;
 218         mm->EMSpageframe=EMSpageframe;
 219         mm->EMSpagesmapped=EMSpagesmapped;
 220         mm->EMShandle=EMShandle;
 221         mm->EMSVer=EMSVer;
 222         return 0;
 223 }
 224
 225
 226 /*
 227 ======================
 228 =
 229 = MML_ShutdownEMS
 230 =
 231 =======================
 232 */
 233
 234 void MML_ShutdownEMS(mminfo_t *mm)
 235 {
 236         boolean errorflag=false;
 237         unsigned EMShandle=mm->EMShandle;
 238
 239         if(!EMShandle)
 240                 return;
 241         __asm
 242         {
 243                 mov     ah,EMS_FREEPAGES
 244                 mov     dx,[EMShandle]
 245                 int     EMS_INT
 246                 or      ah,ah
 247                 jz      ok
 248                 mov     errorflag,1
 249                 ok:
 250         }
 251         if(errorflag==true) printf("MML_ShutdownEMS: Error freeing EMS!\n");    //++++ add something
 252 }
 253
 254 /*
 255 ====================
 256 =
 257 = MM_MapEMS
 258 =
 259 = Maps the 64k of EMS used by memory manager into the page frame
 260 = for general use.  This only needs to be called if you are keeping
 261 = other things in EMS.
 262 =
 263 ====================
 264 */
 265
 266 byte MM_MapEMS(mminfo_t *mm, mminfotype *mmi)
 267 {
 268         char    str[80];
 269         unsigned        EMShandle;
 270         byte err;
 271         boolean errorflag=false;
 272         int     i;
 273         EMShandle=mm->EMShandle;
 274
 275         for (i=0;i<4/*MAPPAGES*/;i++)
 276         {
 277                 __asm
 278                 {
 279                         mov     ah,EMS_MAPPAGE
 280                         mov     bx,[i]                  // logical page
 281                         mov     al,bl                   // physical page
 282                         mov     dx,[EMShandle]  // handle
 283                         int     EMS_INT
 284                         or      ah,ah
 285                         jnz     error
 286                         jmp End
 287                         error:
 288                         mov     err,ah
 289                         mov     errorflag,1
 290                         End:
 291                 }
 292                 if(errorflag==true)
 293                 {
 294                         //err = CPURegs.h.ah;
 295                         strcpy(str,"MM_MapEMS: EMS error");
 296                         //itoa(err,str2,16);
 297                         strcat(str,MM_EMSerr(err));
 298                         printf("%s\n",str);
 299                         //printf("FACK! %x\n", err);
 300                         return err;
 301                 }
 302         }
 303         mmi->EMSmem = (i)*0x4000lu;
 304         return 0;
 305 }
 306
 307 byte MM_MapXEMS(mminfo_t *mm, mminfotype *mmi)
 308 {
 309
 310 //SUB EMS.MapXPages (PhysicalStart, LogicalStart, NumPages, Handle)
 311
 312         //Maps up to 4 logical EMS pages to physical pages in the page frame, where:
 313         //PhysicalStart = Physical page first logical page is mapped to
 314         //LogicalStart  = First logical page to map
 315         //NumPages      = Number of pages to map (1 to 4)
 316         //Handle        = EMS handle logical pages are allocated to
 317
 318   /*//Create a buffer containing the page information
 319 //  FOR x = 0 TO NumPages - 1
 320 //    MapInfo$ = MapInfo$ + MKI$(LogicalStart + x) + MKI$(PhysicalStart + x)
 321 //  NEXT*/
 322
 323 //  Regs.ax = 0x5000                           //Map the pages in the buffer
 324 //  Regs.cx = NumPages                         //to the pageframe
 325 //  Regs.dx = Handle
 326 //  Regs.ds = VARSEG(MapInfo$)
 327 //  Regs.si = SADD(MapInfo$)
 328 //  InterruptX 0x67, Regs, Regs
 329 //      EMS.Error = (Regs.ax AND 0xFF00&) \ 0x100  //Store the status code
 330
 331 //END SUB
 332         char    str[80];
 333         byte err;
 334         word    EMShandle;
 335         boolean errorflag=false;
 336         int     i;
 337         EMShandle=mm->EMShandle;
 338
 339         if(mm->EMSVer<0x40)
 340                 return 5;
 341
 342         for (i=0;i<MAPPAGES;i++)
 343         {
 344                 __asm
 345                 {
 346                         mov     ax,EMS_MAPXPAGE
 347                         mov     cx,[i]                  // logical page
 348                         mov     al,bl                   // physical page
 349                         mov     dx,[EMShandle]  // handle
 350                         int     EMS_INT
 351                         or      ah,ah
 352                         jnz     error
 353                         jmp End
 354                         error:
 355                         mov     err,ah
 356                         mov     errorflag,1
 357                         End:
 358                 }
 359                 if(errorflag==true)
 360                 {
 361                         //err = CPURegs.h.ah;
 362                         //strcpy(str,"MM_MapXEMS: EMS error 0x");
 363                         strcpy(str,"MM_MapXEMS: EMS error");
 364                         //itoa(err,str2,16);
 365                         strcat(str,MM_EMSerr(err));
 366                         printf("%s\n",str);
 367                         //printf("%s%x\n",str, err);
 368                         //printf("FACK! %x\n", err);
 369                         return err;
 370                 }
 371         }
 372         mmi->EMSmem = (i)*0x4000lu;
 373         return 0;
 374 }
 375
 376 //==========================================================================
 377
 378 /*
 379 ======================
 380 =
 381 = MML_CheckForXMS
 382 =
 383 = Check for XMM driver
 384 =
 385 =======================
 386 */
 387
 388 boolean MML_CheckForXMS(mminfo_t *mm)
 389 {
 390         boolean errorflag=false;
 391         mm->numUMBs = 0;
 392
 393         __asm
 394         {
 395                 mov     ax,0x4300
 396                 int     0x2f                            // query status of installed diver
 397                 cmp     al,0x80
 398                 je      good
 399                 mov     errorflag,1
 400                 good:
 401         }
 402         if(errorflag==true) return false;
 403         else return true;
 404 }
 405
 406
 407 /*
 408 ======================
 409 =
 410 = MML_SetupXMS
 411 =
 412 = Try to allocate all upper memory block
 413 =
 414 =======================
 415 */
 416
 417 void MML_SetupXMS(mminfo_t *mm, mminfotype *mmi)
 418 {
 419         unsigned        base,size;
 420
 421 getmemory:
 422         __asm
 423         {
 424                 mov     ax,0x4310
 425                 int     0x2f
 426                 mov     [WORD PTR XMSaddr],bx
 427                 mov     [WORD PTR XMSaddr+2],es         // function pointer to XMS driver
 428
 429                 mov     ah,XMS_ALLOCUMB
 430                 mov     dx,0xffff                                       // try for largest block possible
 431                 //mov     ax,dx                                         // Set available Kbytes.
 432                 call    [DWORD PTR XMSaddr]
 433                 or      ax,ax
 434                 jnz     gotone
 435
 436                 cmp     bl,0xb0                                         // error: smaller UMB is available
 437                 jne     done;
 438
 439                 mov     ah,XMS_ALLOCUMB
 440                 call    [DWORD PTR XMSaddr]             // DX holds largest available UMB
 441                 or      ax,ax
 442                 jz      done                                            // another error...
 443
 444 gotone:
 445                 mov     [base],bx
 446                 mov     [size],dx
 447 done:
 448         }
 449         printf("base=%u ", base); printf("size=%u\n", size);
 450         MML_UseSpace(base,size, mm);
 451         mmi->XMSmem += size*16;
 452         mm->UMBbase[mm->numUMBs] = base;
 453         mm->numUMBs++;
 454         if(mm->numUMBs < MAXUMBS)
 455                 goto getmemory;
 456 }
 457
 458
 459 /*
 460 ======================
 461 =
 462 = MML_ShutdownXMS
 463 =
 464 ======================
 465 */
 466
 467 void MML_ShutdownXMS(mminfo_t *mm)
 468 {
 469         int     i;
 470         unsigned        base;
 471
 472         for (i=0;i<mm->numUMBs;i++)
 473         {
 474                 base = mm->UMBbase[i];
 475                 __asm
 476                 {
 477                         mov     ah,XMS_FREEUMB
 478                         mov     dx,[base]
 479                         call    [DWORD PTR XMSaddr]
 480                 }
 481         }
 482 }
 483
 484 //==========================================================================
 485
 486 /*
 487 ======================
 488 =
 489 = MML_UseSpace
 490 =
 491 = Marks a range of paragraphs as usable by the memory manager
 492 = This is used to mark space for the near heap, far heap, ems page frame,
 493 = and upper memory blocks
 494 =
 495 ======================
 496 */
 497
 498 void MML_UseSpace(/*d*/word segstart, dword seglength, mminfo_t *mm)
 499 {
 500         mmblocktype huge *scan,huge *last;
 501         word            segm;
 502         dword   oldend;
 503         dword           extra;
 504
 505         scan = last = mm->mmhead;
 506         mm->mmrover = mm->mmhead;               // reset rover to start of memory
 507
 508 //
 509 // search for the block that contains the range of segments
 510 //
 511         while(scan->start+scan->length < segstart)
 512         {
 513                 last = scan;
 514                 scan = scan->next;
 515         }
 516
 517         //find out how many blocks it spans!
 518         if(seglength>0xffffu)
 519         {
 520 //              segm=seglength/0x4000u;
 521                 segm=seglength/0xffffu;
 522         }
 523         else segm=1;
 524
 525         //++++emsver stuff!
 526         if(segm>1/*extra>0xfffflu*/)
 527         {
 528                 /*__asm
 529                 {
 530                         push    ds
 531                         mov     ax,ds
 532                         inc             ax
 533                         mov     ds,ax
 534                 }*/
 535
 536
 537 //MML_UseSpace(?segstart?, ?length?, mm);
 538
 539                 /*__asm
 540                 {
 541                         pop ds
 542                 }*/
 543                 //printf("MML_UseSpace: Segment spans two blocks!\n");
 544         }
 545
 546 //
 547 // take the given range out of the block
 548 //
 549         oldend = scan->start + scan->length;
 550         extra = oldend - (segstart+seglength);
 551
 552 printf("segm=%u ", segm);
 553 printf("ex=%lu  ", extra);
 554 printf("start+seglen=%lu        ", segstart+seglength);
 555 printf("len=%u  ", scan->length);
 556 printf("segsta=%x       ", segstart);
 557 printf("seglen=%lu\n", seglength);
 558
 559 //segu:
 560 //++++todo: linked list of segment!
 561 //printf("segm=%lu\n", segm);
 562         if(segstart == scan->start)
 563         {
 564                 last->next = scan->next;                        // unlink block
 565                 MM_FreeBlock(scan, mm);
 566                 scan = last;
 567         }
 568         else
 569                 scan->length = segstart-scan->start;    // shorten block
 570
 571 //      segm--;
 572
 573         if(extra > 0)
 574         {
 575                 MM_GetNewBlock(mm);
 576                 mm->mmnew->next = scan->next;
 577                 scan->next = mm->mmnew;
 578                 mm->mmnew->start = segstart+seglength;
 579                 mm->mmnew->length = extra;
 580                 mm->mmnew->attributes = LOCKBIT;
 581         }//else if(segm>0) goto segu;
 582
 583 }
 584
 585 //==========================================================================
 586
 587 /*
 588 ====================
 589 =
 590 = MML_ClearBlock
 591 =
 592 = We are out of blocks, so free a purgable block
 593 =
 594 ====================
 595 */
 596
 597 void MML_ClearBlock(mminfo_t *mm)
 598 {
 599         mmblocktype huge *scan,huge *last;
 600
 601         scan = mm->mmhead->next;
 602
 603         while(scan)
 604         {
 605                 if(!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS))
 606                 {
 607                         MM_FreePtr(scan->useptr, mm);
 608                         return;
 609                 }
 610                 scan = scan->next;
 611         }
 612
 613         printf("MM_ClearBlock: No purgable blocks!\n");
 614 }
 615
 616
 617 //==========================================================================
 618
 619 /*
 620 ===================
 621 =
 622 = MM_Startup
 623 =
 624 = Grabs all space from turbo with malloc/farmalloc
 625 = Allocates bufferseg misc buffer
 626 =
 627 ===================
 628 */
 629
 630 void MM_Startup(mminfo_t *mm, mminfotype *mmi)
 631 {
 632         int i;
 633         dword length;
 634         void huge       *start;
 635         unsigned        segstart,seglength,endfree;
 636
 637         if(mm->mmstarted)
 638                 MM_Shutdown(mm);
 639
 640         mm->mmstarted = true;
 641         mm->bombonerror = true;
 642 //
 643 // set up the linked list (everything in the free list;
 644 //
 645         mm->mmhead = NULL;
 646         mm->mmfree = &(mm->mmblocks[0]);
 647         for(i=0;i<MAXBLOCKS-1;i++)
 648         {
 649                 mm->mmblocks[i].next = &(mm->mmblocks[i+1]);
 650         }
 651         mm->mmblocks[i].next = NULL;
 652
 653 //
 654 // locked block of all memory until we punch out free space
 655 //
 656         MM_GetNewBlock(mm);
 657         mm->mmhead = mm->mmnew;                         // this will allways be the first node
 658         mm->mmnew->start = 0;
 659         mm->mmnew->length = 0xffff;
 660         mm->mmnew->attributes = LOCKBIT;
 661         mm->mmnew->next = NULL;
 662         mm->mmrover = mm->mmhead;
 663
 664 //      farlen=_bios_memsize()*1024;
 665
 666 //
 667 // get all available near conventional memory segments
 668 //
 669 //----  length=coreleft();
 670         _nheapgrow();
 671         length=_memavl();
 672         start = (void huge *)(mm->nearheap = malloc(length));
 673         length -= 16-(FP_OFF(start)&15);
 674         length -= SAVENEARHEAP;
 675         seglength = length / 16;                        // now in paragraphs
 676         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 677         MML_UseSpace(segstart,seglength, mm);
 678         mmi->nearheap = length;
 679         //printf("near heap ok!\n");
 680
 681 //
 682 // get all available far conventional memory segments
 683 //
 684 //----  length=farcoreleft();
 685         _fheapgrow();
 686         length=_memavl();
 687         start = mm->farheap = halloc(length, sizeof(byte));
 688         //start = mm->farheap = _fmalloc(length);
 689         length -= 16-(FP_OFF(start)&15);
 690         length -= SAVEFARHEAP;
 691         seglength = length / 16;                        // now in paragraphs
 692         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 693         MML_UseSpace(segstart,seglength, mm);
 694         mmi->farheap = length;
 695         mmi->mainmem = mmi->nearheap + mmi->farheap;
 696         //printf("far heap ok!\n");
 697
 698
 699 //
 700 // detect EMS and allocate up to 64K at page frame
 701 //
 702         printf("EMS1\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!
 703         mmi->EMSmem = 0;
 704         for(i = 1;i < __argc;i++)
 705         {
 706                 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 707                         goto emsskip;                           // param NOEMS
 708         }
 709         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!
 710         if(MML_CheckForEMS())
 711         {
 712 printf("EMS2\n");
 713                 MML_SetupEMS(mm);                                       // allocate space
 714 printf("EMS3\n");
 715                 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!
 716                 //TODO: EMS4! AND EMS 3.2 MASSIVE DATA HANDLMENT!
 717                 MML_UseSpace(mm->EMSpageframe,(MAPPAGES)*0x4000lu, mm);
 718 printf("EMS4\n");
 719                 if(mm->EMSVer<0x40)
 720                         MM_MapEMS(mm, mmi);                                     // map in used pages
 721                 else
 722                         MM_MapXEMS(mm, mmi);                                    // map in used pages
 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_EMSerr
1385 =
1386 =====================
1387 */
1388
1389 byte *MM_EMSerr(byte err)
1390 {
1391         //Returns a text string describing the error code in EMS.Error.
1392         switch(err)
1393         {
1394                 case 0x0:
1395                         return "successful";
1396                 case 0x80:
1397                         return "internal error";
1398                 case 0x81:
1399                         return "hardware malfunction";
1400                 case 0x82:
1401                         return "busy .. retry later";
1402                 case 0x83:
1403                         return "invalid handle";
1404                 case 0x84:
1405                         return "undefined function requested by application";
1406                 case 0x85:
1407                         return "no more handles available";
1408                 case 0x86:
1409                         return "error in save or restore of mapping context";
1410                 case 0x87:
1411                         return "insufficient memory pages in system";
1412                 case 0x88:
1413                         return "insufficient memory pages available";
1414                 case 0x89:
1415                         return "zero pages requested";
1416                 case 0x8A:
1417                         return "invalid logical page number encountered";
1418                 case 0x8B:
1419                         return "invalid physical page number encountered";
1420                 case 0x8C:
1421                         return "page-mapping hardware state save area is full";
1422                 case 0x8D:
1423                         return "save of mapping context failed";
1424                 case 0x8E:
1425                         return "restore of mapping context failed";
1426                 case 0x8F:
1427                         return "undefined subfunction";
1428                 case 0x90:
1429                         return "undefined attribute type";
1430                 case 0x91:
1431                         return "feature not supported";
1432                 case 0x92:
1433                         return "successful, but a portion of the source region has been overwritten";
1434                 case 0x93:
1435                         return "length of source or destination region exceeds length of region allocated to either source or destination handle";
1436                 case 0x94:
1437                         return "conventional and expanded memory regions overlap";
1438                 case 0x95:
1439                         return "offset within logical page exceeds size of logical page";
1440                 case 0x96:
1441                         return "region length exceeds 1 MB";
1442                 case 0x97:
1443                         return "source and destination EMS regions have same handle and overlap";
1444                 case 0x98:
1445                         return "memory source or destination type undefined";
1446                 case 0x9A:
1447                         return "specified alternate map register or DMA register set not supported";
1448                 case 0x9B:
1449                         return "all alternate map register or DMA register sets currently allocated";
1450                 case 0x9C:
1451                         return "alternate map register or DMA register sets not supported";
1452                 case 0x9D:
1453                         return "undefined or unallocated alternate map register or DMA register set";
1454                 case 0x9E:
1455                         return "dedicated DMA channels not supported";
1456                 case 0x9F:
1457                         return "specified dedicated DMA channel not supported";
1458                 case 0xA0:
1459                         return "no such handle name";
1460                 case 0xA1:
1461                         return "a handle found had no name, or duplicate handle name";
1462                 case 0xA2:
1463                         return "attempted to wrap around 1M conventional address space";
1464                 case 0xA3:
1465                         return "source array corrupted";
1466                 case 0xA4:
1467                         return "operating system denied access";
1468                 default:
1469                         return "undefined error";
1470         }
1471 }
1472
1473 //==========================================================================
1474
1475 /*
1476 =====================
1477 =
1478 = MM_BombOnError
1479 =
1480 =====================
1481 */
1482
1483 void MM_BombOnError(boolean bomb, mminfo_t *mm)
1484 {
1485         mm->bombonerror = bomb;
1486 }
1487
1488 void MM_GetNewBlock(mminfo_t *mm)
1489 {
1490         if(!mm->mmfree)
1491                 MML_ClearBlock(mm);
1492         mm->mmnew=mm->mmfree;
1493         mm->mmfree=mm->mmfree->next;
1494         /*if(!(mm->mmnew=mm->mmfree))
1495         {
1496                 printf("MM_GETNEWBLOCK: No free blocks!");
1497                 return;
1498         }
1499         mm->mmfree=mm->mmfree->next;*/
1500 }
1501
1502 void MM_FreeBlock(mmblocktype *x, mminfo_t *mm)
1503 {
1504         x->useptr=NULL;
1505         x->next=mm->mmfree;
1506         mm->mmfree=x;
1507 }
1508
1509 void MM_seguin(void)
1510 {
1511         __asm
1512         {
1513                 push    ds
1514                 mov     ax,ds
1515                 inc             ax
1516                 mov     ds,ax
1517         }
1518 }
1519
1520 void MM_segude(void)
1521 {
1522         __asm
1523         {
1524                 pop ds
1525         }
1526 }
1527
1528 /*
1529 pull data from far and put it into ds var
1530 mov ax,es:si
1531 mov x,ax
1532 */
1533 /*
1534 ss stack segment
1535 sp top of stack
1536 bp bottem of stack
1537 */