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         byte    str[160];
 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                 MM_EMSerr(&str, 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         byte    str[160];
 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                         MM_EMSerr(str, 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 //SUB EMS.MapXPages (PhysicalStart, LogicalStart, NumPages, Handle)
 310
 311         //Maps up to 4 logical EMS pages to physical pages in the page frame, where:
 312         //PhysicalStart = Physical page first logical page is mapped to
 313         //LogicalStart  = First logical page to map
 314         //NumPages      = Number of pages to map (1 to 4)
 315         //Handle        = EMS handle logical pages are allocated to
 316
 317   /*//Create a buffer containing the page information
 318 //  FOR x = 0 TO NumPages - 1
 319 //    MapInfo$ = MapInfo$ + MKI$(LogicalStart + x) + MKI$(PhysicalStart + x)
 320 //  NEXT*/
 321
 322 //  Regs.ax = 0x5000                           //Map the pages in the buffer
 323 //  Regs.cx = NumPages                         //to the pageframe
 324 //  Regs.dx = Handle
 325 //  Regs.ds = VARSEG(MapInfo$)
 326 //  Regs.si = SADD(MapInfo$)
 327 //  InterruptX 0x67, Regs, Regs
 328 //      EMS.Error = (Regs.ax AND 0xFF00&) \ 0x100  //Store the status code
 329
 330 //END SUB
 331         byte    str[160];
 332         byte err;
 333         word    EMShandle;
 334         boolean errorflag=false;
 335         int     i;
 336         EMShandle=mm->EMShandle;
 337
 338         if(mm->EMSVer<0x40)
 339                 return 5;
 340
 341         for (i=0;i<MAPPAGES;i++)
 342         {
 343                 __asm
 344                 {
 345                         mov     ah,EMS_MAPXPAGE
 346                         mov     cx,[i]                  // logical page
 347                         mov     al,bl                   // physical page
 348                         mov     dx,[EMShandle]  // handle
 349                         int     EMS_INT
 350                         or      ah,ah
 351                         jnz     error
 352                         jmp End
 353                         error:
 354                         mov     err,ah
 355                         mov     errorflag,1
 356                         End:
 357                 }
 358                 if(errorflag==true)
 359                 {
 360                         //err = CPURegs.h.ah;
 361                         //strcpy(str,"MM_MapXEMS: EMS error 0x");
 362                         strcpy(str,"MM_MapXEMS: EMS error ");
 363                         //itoa(err,str2,16);
 364                         MM_EMSerr(&str, err);
 365                         printf("%s\n",str);
 366                         //printf("%s%x\n",str, err);
 367                         //printf("FACK! %x\n", err);
 368                         return err;
 369                 }
 370         }
 371         mmi->EMSmem = (i)*0x4000lu;
 372         return 0;
 373 }
 374
 375 //==========================================================================
 376
 377 /*
 378 ======================
 379 =
 380 = MML_CheckForXMS
 381 =
 382 = Check for XMM driver
 383 =
 384 =======================
 385 */
 386
 387 boolean MML_CheckForXMS(mminfo_t *mm)
 388 {
 389         boolean errorflag=false;
 390         mm->numUMBs = 0;
 391
 392         __asm
 393         {
 394                 mov     ax,0x4300
 395                 int     0x2f                            // query status of installed diver
 396                 cmp     al,0x80
 397                 je      good
 398                 mov     errorflag,1
 399                 good:
 400         }
 401         if(errorflag==true) return false;
 402         else return true;
 403 }
 404
 405
 406 /*
 407 ======================
 408 =
 409 = MML_SetupXMS
 410 =
 411 = Try to allocate all upper memory block
 412 =
 413 =======================
 414 */
 415
 416 void MML_SetupXMS(mminfo_t *mm, mminfotype *mmi)
 417 {
 418         unsigned        base,size;
 419
 420 getmemory:
 421         __asm
 422         {
 423                 mov     ax,0x4310
 424                 int     0x2f
 425                 mov     [WORD PTR XMSaddr],bx
 426                 mov     [WORD PTR XMSaddr+2],es         // function pointer to XMS driver
 427
 428                 mov     ah,XMS_ALLOCUMB
 429                 mov     dx,0xffff                                       // try for largest block possible
 430                 //mov     ax,dx                                         // Set available Kbytes.
 431                 call    [DWORD PTR XMSaddr]
 432                 or      ax,ax
 433                 jnz     gotone
 434
 435                 cmp     bl,0xb0                                         // error: smaller UMB is available
 436                 jne     done;
 437
 438                 mov     ah,XMS_ALLOCUMB
 439                 call    [DWORD PTR XMSaddr]             // DX holds largest available UMB
 440                 or      ax,ax
 441                 jz      done                                            // another error...
 442
 443 gotone:
 444                 mov     [base],bx
 445                 mov     [size],dx
 446 done:
 447         }
 448         printf("base=%u ", base); printf("size=%u\n", size);
 449         MML_UseSpace(base,size, mm);
 450         mmi->XMSmem += size*16;
 451         mm->UMBbase[mm->numUMBs] = base;
 452         mm->numUMBs++;
 453         if(mm->numUMBs < MAXUMBS)
 454                 goto getmemory;
 455 }
 456
 457
 458 /*
 459 ======================
 460 =
 461 = MML_ShutdownXMS
 462 =
 463 ======================
 464 */
 465
 466 void MML_ShutdownXMS(mminfo_t *mm)
 467 {
 468         int     i;
 469         unsigned        base;
 470
 471         for (i=0;i<mm->numUMBs;i++)
 472         {
 473                 base = mm->UMBbase[i];
 474                 __asm
 475                 {
 476                         mov     ah,XMS_FREEUMB
 477                         mov     dx,[base]
 478                         call    [DWORD PTR XMSaddr]
 479                 }
 480         }
 481 }
 482
 483 //==========================================================================
 484
 485 /*
 486 ======================
 487 =
 488 = MML_UseSpace
 489 =
 490 = Marks a range of paragraphs as usable by the memory manager
 491 = This is used to mark space for the near heap, far heap, ems page frame,
 492 = and upper memory blocks
 493 =
 494 ======================
 495 */
 496
 497 void MML_UseSpace(/*d*/word segstart, dword seglength, mminfo_t *mm)
 498 {
 499         mmblocktype huge *scan,huge *last;
 500         word            segm;
 501         dword   oldend;
 502         dword           extra;
 503
 504         scan = last = mm->mmhead;
 505         mm->mmrover = mm->mmhead;               // reset rover to start of memory
 506
 507 //
 508 // search for the block that contains the range of segments
 509 //
 510         while(scan->start+scan->length < segstart)
 511         {
 512                 last = scan;
 513                 scan = scan->next;
 514         }
 515
 516         //find out how many blocks it spans!
 517         if(seglength>0xffffu)
 518         {
 519 //              segm=seglength/0x4000u;
 520                 segm=seglength/0xffffu;
 521         }
 522         else segm=1;
 523
 524         //++++emsver stuff!
 525         if(segm>1/*extra>0xfffflu*/)
 526         {
 527                 /*__asm
 528                 {
 529                         push    ds
 530                         mov     ax,ds
 531                         inc             ax
 532                         mov     ds,ax
 533                 }*/
 534
 535
 536 //MML_UseSpace(?segstart?, ?length?, mm);
 537
 538                 /*__asm
 539                 {
 540                         pop ds
 541                 }*/
 542                 //printf("MML_UseSpace: Segment spans two blocks!\n");
 543         }
 544
 545 //
 546 // take the given range out of the block
 547 //
 548         oldend = scan->start + scan->length;
 549         extra = oldend - (segstart+seglength);
 550 /*
 551 printf("segm=%u ", segm);
 552 printf("ex=%lu  ", extra);
 553 printf("start+seglen=%lu        ", segstart+seglength);
 554 printf("len=%u  ", scan->length);
 555 printf("segsta=%x       ", segstart);
 556 printf("seglen=%lu\n", seglength);
 557 */
 558 //segu:
 559 //++++todo: linked list of segment!
 560 //printf("segm=%lu\n", segm);
 561         if(segstart == scan->start)
 562         {
 563                 last->next = scan->next;                        // unlink block
 564                 MM_FreeBlock(scan, mm);
 565                 scan = last;
 566         }
 567         else
 568                 scan->length = segstart-scan->start;    // shorten block
 569
 570 //      segm--;
 571
 572         if(extra > 0)
 573         {
 574                 MM_GetNewBlock(mm);
 575                 mm->mmnew->next = scan->next;
 576                 scan->next = mm->mmnew;
 577                 mm->mmnew->start = segstart+seglength;
 578                 mm->mmnew->length = extra;
 579                 mm->mmnew->attributes = LOCKBIT;
 580         }//else if(segm>0) goto segu;
 581
 582 }
 583
 584 //==========================================================================
 585
 586 /*
 587 ====================
 588 =
 589 = MML_ClearBlock
 590 =
 591 = We are out of blocks, so free a purgable block
 592 =
 593 ====================
 594 */
 595
 596 void MML_ClearBlock(mminfo_t *mm)
 597 {
 598         mmblocktype huge *scan,huge *last;
 599
 600         scan = mm->mmhead->next;
 601
 602         while(scan)
 603         {
 604                 if(!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS))
 605                 {
 606                         MM_FreePtr(scan->useptr, mm);
 607                         return;
 608                 }
 609                 scan = scan->next;
 610         }
 611
 612         printf("MM_ClearBlock: No purgable blocks!\n");
 613 }
 614
 615
 616 //==========================================================================
 617
 618 /*
 619 ===================
 620 =
 621 = MM_Startup
 622 =
 623 = Grabs all space from turbo with malloc/farmalloc
 624 = Allocates bufferseg misc buffer
 625 =
 626 ===================
 627 */
 628
 629 void MM_Startup(mminfo_t *mm, mminfotype *mmi)
 630 {
 631         int i;
 632         dword length;
 633         void huge       *start;
 634         unsigned        segstart,seglength,endfree;
 635
 636         if(mm->mmstarted)
 637                 MM_Shutdown(mm);
 638
 639         mm->mmstarted = true;
 640         mm->bombonerror = true;
 641 //
 642 // set up the linked list (everything in the free list;
 643 //
 644         printf("                linked list making!\n");
 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         printf("                newblock making!\n");
 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         printf("                nearheap making!\n");
 671 //----  length=coreleft();
 672         _nheapgrow();
 673         length=_memavl();
 674         start = (void huge *)(mm->nearheap = malloc(length));
 675         length -= 16-(FP_OFF(start)&15);
 676         length -= SAVENEARHEAP;
 677         seglength = length / 16;                        // now in paragraphs
 678         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 679         MML_UseSpace(segstart,seglength, mm);
 680         mmi->nearheap = length;
 681         printf("                near heap ok!\n");
 682
 683 //
 684 // get all available far conventional memory segments
 685 //
 686 //----  length=farcoreleft();
 687         printf("                farheap making!\n");
 688         _fheapgrow();
 689         length=_memavl();
 690         start = mm->farheap = halloc(length, sizeof(byte));
 691         //start = mm->farheap = _fmalloc(length);
 692         length -= 16-(FP_OFF(start)&15);
 693         length -= SAVEFARHEAP;
 694         seglength = length / 16;                        // now in paragraphs
 695         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;
 696         MML_UseSpace(segstart,seglength, mm);
 697         mmi->farheap = length;
 698         mmi->mainmem = mmi->nearheap + mmi->farheap;
 699         printf("                far heap ok!\n");
 700
 701
 702 //
 703 // detect EMS and allocate up to 64K at page frame
 704 //
 705         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!
 706         mmi->EMSmem = 0;
 707         for(i = 1;i < __argc;i++)
 708         {
 709                 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 710                         goto emsskip;                           // param NOEMS
 711         }
 712         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!
 713         if(MML_CheckForEMS())
 714         {
 715 printf("                EMS2\n");
 716                 MML_SetupEMS(mm);                                       // allocate space
 717 printf("                EMS3\n");
 718                 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!
 719                 //TODO: EMS4! AND EMS 3.2 MASSIVE DATA HANDLMENT!
 720                 MML_UseSpace(mm->EMSpageframe,(MAPPAGES)*0x4000lu, mm);
 721 printf("                EMS4\n");
 722                 //if(mm->EMSVer<0x40)
 723                         MM_MapEMS(mm, mmi);                                     // map in used pages
 724                 //else
 725                 //      MM_MapXEMS(mm, mmi);                                    // map in used pages
 726         }
 727
 728 //
 729 // detect XMS and get upper memory blocks
 730 //
 731 emsskip:
 732         mmi->XMSmem = 0;
 733         for(i = 1;i < __argc;i++)
 734         {
 735                 if(US_CheckParm(__argv[i],ParmStringsexmm) == 0)
 736                         goto xmsskip;                           // param NOXMS
 737         }
 738         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!
 739         if(MML_CheckForXMS(mm))
 740         {
 741                 printf("                XMS!\n");
 742                 //MML_SetupXMS(mm, mmi);                                        // allocate as many UMBs as possible
 743         }
 744
 745 //
 746 // allocate the misc buffer
 747 //
 748 xmsskip:
 749         mm->mmrover = mm->mmhead;               // start looking for space after low block
 750
 751         MM_GetPtr(&(mm->bufferseg),BUFFERSIZE, mm, mmi);
 752 }
 753
 754 //==========================================================================
 755
 756 /*
 757 ====================
 758 =
 759 = MM_Shutdown
 760 =
 761 = Frees all conventional, EMS, and XMS allocated
 762 =
 763 ====================
 764 */
 765
 766 void MM_Shutdown(mminfo_t *mm)
 767 {
 768         if(!(mm->mmstarted))
 769                 return;
 770
 771         _ffree(mm->farheap);
 772         printf("                far freed\n");
 773         free(mm->nearheap);
 774         printf("                near freed\n");
 775         //hfree(mm->hugeheap);
 776         //printf("huge freed\n");
 777         if(MML_CheckForEMS()){ MML_ShutdownEMS(mm); printf("            EMS freed\n"); }
 778         if(MML_CheckForXMS(mm)){ MML_ShutdownXMS(mm); printf("          XMS freed\n"); }
 779 }
 780
 781 //==========================================================================
 782
 783 /*
 784 ====================
 785 =
 786 = MM_GetPtr
 787 =
 788 = Allocates an unlocked, unpurgable block
 789 =
 790 ====================
 791 */
 792
 793 void MM_GetPtr(memptr *baseptr,dword size, mminfo_t *mm, mminfotype *mmi)
 794 {
 795         mmblocktype huge *scan,huge *lastscan,huge *endscan,huge *purge,huge *next;
 796         int                     search;
 797         unsigned        needed,startseg;
 798
 799         needed = (size+15)/16;          // convert size from bytes to paragraphs
 800
 801         MM_GetNewBlock(mm);                             // fill in start and next after a spot is found
 802         mm->mmnew->length = needed;
 803         mm->mmnew->useptr = baseptr;
 804         mm->mmnew->attributes = BASEATTRIBUTES;
 805
 806         for(search = 0; search<3; search++)
 807         {
 808         //
 809         // first search:        try to allocate right after the rover, then on up
 810         // second search:       search from the head pointer up to the rover
 811         // third search:        compress memory, then scan from start
 812                 if(search == 1 && mm->mmrover == mm->mmhead)
 813                         search++;
 814
 815                 switch(search)
 816                 {
 817                 case 0:
 818                         lastscan = mm->mmrover;
 819                         scan = mm->mmrover->next;
 820                         endscan = NULL;
 821                         break;
 822                 case 1:
 823                         lastscan = mm->mmhead;
 824                         scan = mm->mmhead->next;
 825                         endscan = mm->mmrover;
 826                         break;
 827                 case 2:
 828                         MM_SortMem(mm);
 829                         lastscan = mm->mmhead;
 830                         scan = mm->mmhead->next;
 831                         endscan = NULL;
 832                         break;
 833                 }
 834
 835                 startseg = lastscan->start + lastscan->length;
 836
 837                 while(scan != endscan)
 838                 {
 839                         if(scan->start - startseg >= needed)
 840                         {
 841                         //
 842                         // got enough space between the end of lastscan and
 843                         // the start of scan, so throw out anything in the middle
 844                         // and allocate the new block
 845                         //
 846                                 purge = lastscan->next;
 847                                 lastscan->next = mm->mmnew;
 848                                 mm->mmnew->start = *(unsigned *)baseptr = startseg;
 849                                 mm->mmnew->next = scan;
 850                                 while(purge != scan)
 851                                 {       // free the purgable block
 852                                         next = purge->next;
 853                                         MM_FreeBlock(purge, mm);
 854                                         purge = next;           // purge another if not at scan
 855                                 }
 856                                 mm->mmrover = mm->mmnew;
 857                                 return; // good allocation!
 858                         }
 859
 860                         //
 861                         // if this block is purge level zero or locked, skip past it
 862                         //
 863                         if((scan->attributes & LOCKBIT)
 864                                 || !(scan->attributes & PURGEBITS) )
 865                         {
 866                                 lastscan = scan;
 867                                 startseg = lastscan->start + lastscan->length;
 868                         }
 869
 870
 871                         scan=scan->next;                // look at next line
 872                 }
 873         }
 874
 875         if (mm->bombonerror)
 876                 printf(OUT_OF_MEM_MSG,(size-mmi->nearheap));
 877         else
 878                 mm->mmerror = true;
 879 }
 880
 881 //==========================================================================
 882
 883 /*
 884 ====================
 885 =
 886 = MM_FreePtr
 887 =
 888 = Allocates an unlocked, unpurgable block
 889 =
 890 ====================
 891 */
 892
 893 void MM_FreePtr(memptr *baseptr, mminfo_t *mm)
 894 {
 895         mmblocktype huge *scan,huge *last;
 896
 897         last = mm->mmhead;
 898         scan = last->next;
 899
 900         if(baseptr == mm->mmrover->useptr)      // removed the last allocated block
 901                 mm->mmrover = mm->mmhead;
 902
 903         while(scan->useptr != baseptr && scan)
 904         {
 905                 last = scan;
 906                 scan = scan->next;
 907         }
 908
 909         if(!scan)
 910         {
 911                 printf("MM_FreePtr: Block not found!\n");
 912                 return;
 913         }
 914
 915         last->next = scan->next;
 916
 917         MM_FreeBlock(scan, mm);
 918 }
 919 //==========================================================================
 920
 921 /*
 922 =====================
 923 =
 924 = MM_SetPurge
 925 =
 926 = Sets the purge level for a block (locked blocks cannot be made purgable)
 927 =
 928 =====================
 929 */
 930
 931 void MM_SetPurge(memptr *baseptr, int purge, mminfo_t *mm)
 932 {
 933         mmblocktype huge *start;
 934
 935         start = mm->mmrover;
 936
 937         do
 938         {
 939                 if(mm->mmrover->useptr == baseptr)
 940                         break;
 941
 942                 mm->mmrover = mm->mmrover->next;
 943
 944                 if(!mm->mmrover)
 945                         mm->mmrover = mm->mmhead;
 946                 else if(mm->mmrover == start)
 947                 {
 948                         printf("MM_SetPurge: Block not found!");
 949                         return;
 950                 }
 951
 952         } while(1);
 953
 954         mm->mmrover->attributes &= ~PURGEBITS;
 955         mm->mmrover->attributes |= purge;
 956 }
 957
 958 //==========================================================================
 959
 960 /*
 961 =====================
 962 =
 963 = MM_SetLock
 964 =
 965 = Locks / unlocks the block
 966 =
 967 =====================
 968 */
 969
 970 void MM_SetLock(memptr *baseptr, boolean locked, mminfo_t *mm)
 971 {
 972         mmblocktype huge *start;
 973
 974         start = mm->mmrover;
 975
 976         do
 977         {
 978                 if(mm->mmrover->useptr == baseptr)
 979                         break;
 980
 981                 mm->mmrover = mm->mmrover->next;
 982
 983                 if(!mm->mmrover)
 984                         mm->mmrover = mm->mmhead;
 985                 else if(mm->mmrover == start)
 986                 {
 987                         printf("MM_SetLock: Block not found!");
 988                         return;
 989                 }
 990
 991         } while(1);
 992
 993         mm->mmrover->attributes &= ~LOCKBIT;
 994         mm->mmrover->attributes |= locked*LOCKBIT;
 995 }
 996
 997 //==========================================================================
 998
 999 /*
1000 =====================
1001 =
1002 = MM_SortMem
1003 =
1004 = Throws out all purgable stuff and compresses movable blocks
1005 =
1006 =====================
1007 */
1008
1009 void MM_SortMem(mminfo_t *mm)
1010 {
1011         mmblocktype huge *scan,huge *last,huge *next;
1012         unsigned        start,length,source,dest,oldborder;
1013         int                     playing;
1014
1015         //
1016         // lock down a currently playing sound
1017         //
1018 /*++++  playing = SD_SoundPlaying ();
1019         if(playing)
1020         {
1021                 switch (SoundMode)
1022                 {
1023                 case sdm_PC:
1024                         playing += STARTPCSOUNDS;
1025                         break;
1026                 case sdm_AdLib:
1027                         playing += STARTADLIBSOUNDS;
1028                         break;
1029                 }
1030                 MM_SetLock(&(memptr)audiosegs[playing],true);
1031         }
1032
1033
1034         SD_StopSound();*/
1035 //      oldborder = bordercolor;
1036 //      VW_ColorBorder (15);
1037
1038         if(beforesort)
1039                 beforesort();
1040
1041         scan = mm->mmhead;
1042
1043         last = NULL;            // shut up compiler warning
1044
1045         while(scan)
1046         {
1047                 if(scan->attributes & LOCKBIT)
1048                 {
1049                 //
1050                 // block is locked, so try to pile later blocks right after it
1051                 //
1052                         start = scan->start + scan->length;
1053                 }
1054                 else
1055                 {
1056                         if(scan->attributes & PURGEBITS)
1057                         {
1058                         //
1059                         // throw out the purgable block
1060                         //
1061                                 next = scan->next;
1062                                 MM_FreeBlock(scan, mm);
1063                                 last->next = next;
1064                                 scan = next;
1065                                 continue;
1066                         }
1067                         else
1068                         {
1069                         //
1070                         // push the non purgable block on top of the last moved block
1071                         //
1072                                 if(scan->start != start)
1073                                 {
1074                                         length = scan->length;
1075                                         source = scan->start;
1076                                         dest = start;
1077                                         while(length > 0xf00)
1078                                         {
1079                                                 movedata(source,0,dest,0,0xf00*16);
1080                                                 length -= 0xf00;
1081                                                 source += 0xf00;
1082                                                 dest += 0xf00;
1083                                         }
1084                                         movedata(source,0,dest,0,length*16);
1085
1086                                         scan->start = start;
1087                                         *(unsigned *)scan->useptr = start;
1088                                 }
1089                                 start = scan->start + scan->length;
1090                         }
1091                 }
1092
1093                 last = scan;
1094                 scan = scan->next;              // go to next block
1095         }
1096
1097         mm->mmrover = mm->mmhead;
1098
1099         if(aftersort)
1100                 aftersort();
1101
1102 //      VW_ColorBorder (oldborder);
1103
1104 /*++++  if(playing)
1105                 MM_SetLock(&(memptr)audiosegs[playing],false);*/
1106 }
1107
1108
1109 //==========================================================================
1110
1111 //****#if 0
1112 /*
1113 =====================
1114 =
1115 = MM_ShowMemory
1116 =
1117 =====================
1118 */
1119
1120 void MM_ShowMemory(page_t *page, mminfo_t *mm)
1121 {
1122         mmblocktype huge *scan;
1123         word color,temp;
1124         long    end,owner;
1125         word chx,chy;
1126         byte    scratch[160],str[16];
1127
1128 //****  VW_SetDefaultColors();
1129 //****  VW_SetLineWidth(40);
1130 //++++mh        temp = bufferofs;
1131 //++++mh        bufferofs = 0;
1132 //****  VW_SetScreen (0,0);
1133
1134         scan = mm->mmhead;
1135
1136         end = -1;
1137
1138 CA_OpenDebug ();
1139
1140         chx=0;
1141         chy=0;
1142
1143         while(scan)
1144         {
1145                 if(scan->attributes & PURGEBITS)
1146                         color = 5;              // dark purple = purgable
1147                 else
1148                         color = 9;              // medium blue = non purgable
1149                 if(scan->attributes & LOCKBIT)
1150                         color = 12;             // red = locked
1151                 if(scan->start<=end)
1152                 {
1153                         //printf(");
1154                         write(debughandle,"\nMM_ShowMemory: Memory block order currupted!\n",strlen("\nMM_ShowMemory: Memory block order currupted!\n"));
1155                         //modexprint(&page, chx, chy, 1, 0, 24, "\nMM_ShowMemory: Memory block order currupted!\n");
1156                         return;
1157                 }
1158                 end = scan->start+scan->length-1;
1159                 chy = scan->start/320;
1160                 chx = scan->start%320;
1161                                 //modexhlin(page, scan->start, (unsigned)end, chy, color);
1162                                 //for(chx=scan->start;chx+4>=(word)end;chx+=4)
1163                                 //{
1164                                         modexClearRegion(page, chx, chy, 4, 4, color);
1165                                 //}
1166
1167 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);
1168
1169 //++++          VW_Plot(scan->start,0,15);
1170                                 modexClearRegion(page, chx, chy, 4, 4, 15);
1171                 if(scan->next->start > end+1)
1172 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free
1173                         //for(chx=scan->next->start;chx+4>=(word)end+1;chx+=4)
1174                         //{
1175                                 chx+=scan->next->start;
1176                                 modexClearRegion(page, chx, chy, 4, 4, 2);
1177                         //}
1178                                         //modexhlin(page, end+1,scan->next->start, chy, 0);
1179
1180 /*
1181                 end = scan->length-1;
1182                 y = scan->start/320;
1183                 x = scan->start%320;
1184                 VW_Hlin(x,x+end,y,color);
1185                 VW_Plot(x,y,15);
1186                 if (scan->next && scan->next->start > end+1)
1187                         VW_Hlin(x+end+1,x+(scan->next->start-scan->start),y,0); // black = free
1188 */
1189
1190 //****#if 0
1191 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!
1192 strcpy(scratch,"Seg:");
1193 ultoa (scan->start,str,16);
1194 strcat (scratch,str);
1195 strcat (scratch,"\tSize:");
1196 ltoa ((dword)scan->length*16,str,10);
1197 strcat (scratch,str);
1198 strcat (scratch,"\tOwner:0x");
1199 owner = (unsigned)scan->useptr;
1200 ultoa (owner,str,16);
1201 strcat (scratch,str);
1202 strcat (scratch,"\n");
1203 write(debughandle,scratch,strlen(scratch));
1204 //modexprint(page, chx, chy, 1, 0, 24, &scratch);
1205 chy+=4;
1206 //fprintf(stdout, "%s", scratch);
1207 //****#endif
1208
1209                 scan = scan->next;
1210         }
1211
1212 CA_CloseDebug ();
1213
1214 //++++mh        IN_Ack();
1215 //****  VW_SetLineWidth(64);
1216 //++++mh        bufferofs = temp;
1217 }
1218 //****#endif
1219
1220 //==========================================================================
1221
1222 /*
1223 =====================
1224 =
1225 = MM_DumpData
1226 =
1227 =====================
1228 */
1229
1230 void MM_DumpData(mminfo_t *mm)
1231 {
1232         mmblocktype far *scan,far *best;
1233         long    lowest,oldlowest;
1234         word    owner;
1235         byte    lock,purge;
1236         FILE    *dumpfile;
1237
1238
1239         free (mm->nearheap);
1240         dumpfile = fopen ("mmdump.txt","w");
1241         if (!dumpfile){
1242                 printf("MM_DumpData: Couldn't open MMDUMP.TXT!\n");
1243                 return;
1244         }
1245
1246         lowest = -1;
1247         do
1248         {
1249                 oldlowest = lowest;
1250                 lowest = 0xffff;
1251
1252                 scan = mm->mmhead;
1253                 while (scan)
1254                 {
1255                         owner = (word)scan->useptr;
1256
1257                         if (owner && owner<lowest && owner > oldlowest)
1258                         {
1259                                 best = scan;
1260                                 lowest = owner;
1261                         }
1262
1263                         scan = scan->next;
1264                 }
1265
1266                 if (lowest != 0xffff)
1267                 {
1268                         if (best->attributes & PURGEBITS)
1269                                 purge = 'P';
1270                         else
1271                                 purge = '-';
1272                         if (best->attributes & LOCKBIT)
1273                                 lock = 'L';
1274                         else
1275                                 lock = '-';
1276                         fprintf (dumpfile,"0x%p (%c%c) = %u\n"
1277                         ,(word)lowest,lock,purge,best->length);
1278                 }
1279
1280         } while (lowest != 0xffff);
1281
1282         fclose (dumpfile);
1283         printf("MMDUMP.TXT created.\n");
1284 }
1285
1286 //==========================================================================
1287
1288
1289 /*
1290 ======================
1291 =
1292 = MM_UnusedMemory
1293 =
1294 = Returns the total free space without purging
1295 =
1296 ======================
1297 */
1298
1299 dword MM_UnusedMemory(mminfo_t *mm)
1300 {
1301         dword free;
1302         mmblocktype huge *scan;
1303
1304         free = 0;
1305         scan = mm->mmhead;
1306
1307         while(scan->next)
1308         {
1309                 free += scan->next->start - (scan->start + scan->length);
1310                 scan = scan->next;
1311         }
1312
1313         return free*16l;
1314 //      return free;
1315 }
1316
1317 //==========================================================================
1318
1319
1320 /*
1321 ======================
1322 =
1323 = MM_TotalFree
1324 =
1325 = Returns the total free space with purging
1326 =
1327 ======================
1328 */
1329
1330 dword MM_TotalFree(mminfo_t *mm)
1331 {
1332         dword free;
1333         mmblocktype huge *scan;
1334
1335         free = 0;
1336         scan = mm->mmhead;
1337
1338         while(scan->next)
1339         {
1340                 if((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))
1341                         free += scan->length;
1342                 free += scan->next->start - (scan->start + scan->length);
1343                 scan = scan->next;
1344         }
1345
1346         return free*16l;
1347 //      return free;
1348 }
1349
1350 //==========================================================================
1351
1352 /*
1353 =====================
1354 =
1355 = MM_Report
1356 =
1357 =====================
1358 */
1359
1360 void MM_Report(page_t *page, mminfo_t *mm, mminfotype *mmi)
1361 {
1362         if(MML_CheckForEMS())
1363         {
1364                 printf("EMM v%x.%x available\n", mm->EMSVer>>4,mm->EMSVer&0x0F);
1365                 printf("totalEMSpages=%u\n", mm->totalEMSpages);
1366                 printf("freeEMSpages=%u\n", mm->freeEMSpages);
1367                 printf("EMSpageframe=%x\n", mm->EMSpageframe);
1368         }
1369         if(MML_CheckForXMS(mm)) printf("XMSaddr=%Fp\n", *XMSaddr);
1370         printf("near=%lu\n", mmi->nearheap);
1371         printf("far=%lu\n", mmi->farheap);
1372         printf("EMSmem=%lu\n", mmi->EMSmem);
1373         printf("XMSmem=%lu\n", mmi->XMSmem);
1374         printf("mainmem=%lu\n", mmi->mainmem);
1375         printf("UnusedMemory=%lu\n", MM_UnusedMemory(mm));
1376         printf("TotalFree=%lu\n", MM_TotalFree(mm));
1377 //      printf("\n");
1378 //      printf("UnusedMemory=%lu kb\n", MM_UnusedMemory()/10248);
1379 //      printf("TotalFree=%lu kb\n", MM_TotalFree()/10248);
1380 }
1381
1382 //==========================================================================
1383
1384 /*
1385 =====================
1386 =
1387 = MM_EMSerr
1388 =
1389 =====================
1390 */
1391
1392 void MM_EMSerr(byte *stri, byte err)
1393 {
1394         //Returns a text string describing the error code in EMS.Error.
1395         switch(err)
1396         {
1397                 case 0x0:
1398                         strcat(stri, "successful");
1399                 break;
1400                 case 0x80:
1401                         strcat(stri, "internal error");
1402                 break;
1403                 case 0x81:
1404                         strcat(stri, "hardware malfunction");
1405                 break;
1406                 case 0x82:
1407                         strcat(stri, "busy .. retry later");
1408                 break;
1409                 case 0x83:
1410                         strcat(stri, "invalid handle");
1411                 break;
1412                 case 0x84:
1413                         strcat(stri, "undefined function requested by application");
1414                 break;
1415                 case 0x85:
1416                         strcat(stri, "no more handles available");
1417                 break;
1418                 case 0x86:
1419                         strcat(stri, "error in save or restore of mapping context");
1420                 break;
1421                 case 0x87:
1422                         strcat(stri, "insufficient memory pages in system");
1423                 break;
1424                 case 0x88:
1425                         strcat(stri, "insufficient memory pages available");
1426                 break;
1427                 case 0x89:
1428                         strcat(stri, "zero pages requested");
1429                 break;
1430                 case 0x8A:
1431                         strcat(stri, "invalid logical page number encountered");
1432                 break;
1433                 case 0x8B:
1434                         strcat(stri, "invalid physical page number encountered");
1435                 break;
1436                 case 0x8C:
1437                         strcat(stri, "page-mapping hardware state save area is full");
1438                 break;
1439                 case 0x8D:
1440                         strcat(stri, "save of mapping context failed");
1441                 break;
1442                 case 0x8E:
1443                         strcat(stri, "restore of mapping context failed");
1444                 break;
1445                 case 0x8F:
1446                         strcat(stri, "undefined subfunction");
1447                 break;
1448                 case 0x90:
1449                         strcat(stri, "undefined attribute type");
1450                 break;
1451                 case 0x91:
1452                         strcat(stri, "feature not supported");
1453                 break;
1454                 case 0x92:
1455                         strcat(stri, "successful, but a portion of the source region has been overwritten");
1456                 break;
1457                 case 0x93:
1458                         strcat(stri, "length of source or destination region exceeds length of region allocated to either source or destination handle");
1459                 break;
1460                 case 0x94:
1461                         strcat(stri, "conventional and expanded memory regions overlap");
1462                 break;
1463                 case 0x95:
1464                         strcat(stri, "offset within logical page exceeds size of logical page");
1465                 break;
1466                 case 0x96:
1467                         strcat(stri, "region length exceeds 1 MB");
1468                 break;
1469                 case 0x97:
1470                         strcat(stri, "source and destination EMS regions have same handle and overlap");
1471                 break;
1472                 case 0x98:
1473                         strcat(stri, "memory source or destination type undefined");
1474                 break;
1475                 case 0x9A:
1476                         strcat(stri, "specified alternate map register or DMA register set not supported");
1477                 break;
1478                 case 0x9B:
1479                         strcat(stri, "all alternate map register or DMA register sets currently allocated");
1480                 break;
1481                 case 0x9C:
1482                         strcat(stri, "alternate map register or DMA register sets not supported");
1483                 break;
1484                 case 0x9D:
1485                         strcat(stri, "undefined or unallocated alternate map register or DMA register set");
1486                 break;
1487                 case 0x9E:
1488                         strcat(stri, "dedicated DMA channels not supported");
1489                 break;
1490                 case 0x9F:
1491                         strcat(stri, "specified dedicated DMA channel not supported");
1492                 break;
1493                 case 0xA0:
1494                         strcat(stri, "no such handle name");
1495                 break;
1496                 case 0xA1:
1497                         strcat(stri, "a handle found had no name, or duplicate handle name");
1498                 break;
1499                 case 0xA2:
1500                         strcat(stri, "attempted to wrap around 1M conventional address space");
1501                 break;
1502                 case 0xA3:
1503                         strcat(stri, "source array corrupted");
1504                 break;
1505                 case 0xA4:
1506                         strcat(stri, "operating system denied access");
1507                 break;
1508                 default:
1509                         strcat(stri, "undefined error");
1510         }
1511 }
1512
1513 //==========================================================================
1514
1515 /*
1516 =====================
1517 =
1518 = MM_BombOnError
1519 =
1520 =====================
1521 */
1522
1523 void MM_BombOnError(boolean bomb, mminfo_t *mm)
1524 {
1525         mm->bombonerror = bomb;
1526 }
1527
1528 void MM_GetNewBlock(mminfo_t *mm)
1529 {
1530         if(!mm->mmfree)
1531                 MML_ClearBlock(mm);
1532         mm->mmnew=mm->mmfree;
1533         mm->mmfree=mm->mmfree->next;
1534         /*if(!(mm->mmnew=mm->mmfree))
1535         {
1536                 printf("MM_GETNEWBLOCK: No free blocks!");
1537                 return;
1538         }
1539         mm->mmfree=mm->mmfree->next;*/
1540 }
1541
1542 void MM_FreeBlock(mmblocktype *x, mminfo_t *mm)
1543 {
1544         x->useptr=NULL;
1545         x->next=mm->mmfree;
1546         mm->mmfree=x;
1547 }
1548
1549 void MM_seguin(void)
1550 {
1551         __asm
1552         {
1553                 push    ds
1554                 mov     ax,ds
1555                 inc             ax
1556                 mov     ds,ax
1557         }
1558 }
1559
1560 void MM_segude(void)
1561 {
1562         __asm
1563         {
1564                 pop ds
1565         }
1566 }
1567
1568 /*
1569 pull data from far and put it into ds var
1570 mov ax,es:si
1571 mov x,ax
1572 */
1573 /*
1574 ss stack segment
1575 sp top of stack
1576 bp bottem of stack
1577 */