src/lib/16_mm.c

   1 /* Catacomb Apocalypse Source Code\r
   2  * Copyright (C) 1993-2014 Flat Rock Software\r
   3  *\r
   4  * This program is free software; you can redistribute it and/or modify\r
   5  * it under the terms of the GNU General Public License as published by\r
   6  * the Free Software Foundation; either version 2 of the License, or\r
   7  * (at your option) any later version.\r
   8  *\r
   9  * This program is distributed in the hope that it will be useful,\r
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
  12  * GNU General Public License for more details.\r
  13  *\r
  14  * You should have received a copy of the GNU General Public License along\r
  15  * with this program; if not, write to the Free Software Foundation, Inc.,\r
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.\r
  17  */\r
  18 \r
  19 // NEWMM.C\r
  20 \r
  21 /*\r
  22 =============================================================================\r
  23 \r
  24                         ID software memory manager\r
  25                         --------------------------\r
  26 \r
  27 Primary coder: John Carmack\r
  28 \r
  29 RELIES ON\r
  30 ---------\r
  31 Quit (char *error) function\r
  32 \r
  33 \r
  34 WORK TO DO\r
  35 ----------\r
  36 MM_SizePtr to change the size of a given pointer\r
  37 \r
  38 Multiple purge levels utilized\r
  39 \r
  40 EMS / XMS unmanaged routines\r
  41 \r
  42 =============================================================================\r
  43 */\r
  44 \r
  45 #include "src/lib/16_mm.h"\r
  46
  47 /*\r
  48 =============================================================================\r
  49 \r
  50                                                  GLOBAL VARIABLES\r
  51 \r
  52 =============================================================================\r
  53 */\r
  54 \r
  55 mminfotype      mminfo;\r
  56 memptr          bufferseg;\r
  57 boolean         mmerror;\r
  58 \r
  59 void            (* beforesort) (void);\r
  60 void            (* aftersort) (void);\r
  61 \r
  62 /*\r
  63 =============================================================================\r
  64 \r
  65                                                  LOCAL VARIABLES\r
  66 \r
  67 =============================================================================\r
  68 */\r
  69 \r
  70 boolean         mmstarted;\r
  71 \r
  72 void far        *farheap;\r
  73 void            *nearheap;\r
  74 \r
  75 mmblocktype     far mmblocks[MAXBLOCKS]\r
  76                         ,far *mmhead,far *mmfree,far *mmrover,far *mmnew;\r
  77 \r
  78 boolean         bombonerror;\r
  79 \r
  80 unsigned        totalEMSpages,freeEMSpages,EMSpageframe,EMSpagesmapped,EMShandle;
  81 unsigned int EMSVer;\r
  82 \r
  83 void            (* XMSaddr) (void);             // far pointer to XMS driver\r
  84 \r
  85 unsigned        numUMBs,UMBbase[MAXUMBS];
  86
  87 static  char *ParmStringsexmm[] = {"noems","noxms",""};
  88 \r
  89 /*\r
  90 ======================\r
  91 =\r
  92 = MML_CheckForEMS\r
  93 =\r
  94 = Routine from p36 of Extending DOS\r
  95 =\r
  96 =======================\r
  97 */\r
  98 \r
  99 boolean MML_CheckForEMS (void)\r
 100 {\r
 101         boolean emmcfems;\r
 102         char    emmname[] = "EMMXXXX0";\r
 103 //              mov     dx,OFFSET emmname\r
 104         __asm {\r
 105                 LEA     DX, emmname     //fix by andrius4669\r
 106                 mov     ax,0x3d00\r
 107                 int     0x21            // try to open EMMXXXX0 device\r
 108                 jc      error\r
 109 \r
 110                 mov     bx,ax\r
 111                 mov     ax,0x4400\r
 112 \r
 113                 int     0x21            // get device info\r
 114                 jc      error\r
 115 \r
 116                 and     dx,0x80\r
 117                 jz      error\r
 118 \r
 119                 mov     ax,0x4407\r
 120 \r
 121                 int     0x21            // get status\r
 122                 jc      error\r
 123                 or      al,al\r
 124                 jz      error\r
 125 \r
 126                 mov     ah,0x3e\r
 127                 int     0x21            // close handle\r
 128                 jc      error\r
 129                 //\r
 130                 // EMS is good\r
 131                 //\r
 132                 mov     emmcfems,1\r
 133                 jmp End\r
 134                 error:\r
 135                 //\r
 136                 // EMS is bad\r
 137                 //\r
 138                 mov     emmcfems,0\r
 139                 End:\r
 140         }\r
 141         return(emmcfems);\r
 142 }\r
 143 \r
 144 \r
 145 /*\r
 146 ======================\r
 147 =\r
 148 = MML_SetupEMS\r
 149 =\r
 150 =======================\r
 151 */\r
 152 \r
 153 unsigned MML_SetupEMS (void)\r
 154 {\r
 155         char    str[80],str2[10];\r
 156         unsigned        err;\r
 157         boolean errorflag=false;\r
 158         union REGS CPURegs;\r
 159 \r
 160         EMSVer = 0;\r
 161         totalEMSpages = freeEMSpages = EMSpageframe = EMSpagesmapped = 0;\r
 162 \r
 163         __asm\r
 164                 {\r
 165                 mov     ah,EMS_STATUS\r
 166                 int     EMS_INT                                         // make sure EMS hardware is present\r
 167                 or      ah,ah\r
 168                 jnz     error\r
 169 \r
 170                 mov     ah,EMS_VERSION\r
 171                 int     EMS_INT\r
 172                 or      ah,ah\r
 173                 jnz     error\r
 174                 mov     [EMSVer],ax                             //      set EMSVer\r
 175                 cmp     al,0x32                                         // only work on ems 3.2 or greater\r
 176                 jb      error\r
 177 \r
 178                 mov     ah,EMS_GETFRAME\r
 179                 int     EMS_INT                                         // find the page frame address\r
 180                 or      ah,ah\r
 181                 jnz     error\r
 182                 mov     [EMSpageframe],bx\r
 183 \r
 184                 mov     ah,EMS_GETPAGES\r
 185                 int     EMS_INT                                         // find out how much EMS is there\r
 186                 or      ah,ah\r
 187                 jnz     error\r
 188                 mov     [totalEMSpages],dx\r
 189                 mov     [freeEMSpages],bx\r
 190                 or      bx,bx\r
 191                 jz      noEMS                                           // no EMS at all to allocate\r
 192 \r
 193                 cmp     bx,4\r
 194                 jle     getpages                                        // there is only 1,2,3,or 4 pages\r
 195                 mov     bx,4                                            // we can't use more than 4 pages\r
 196 \r
 197 getpages:\r
 198                 mov     [EMSpagesmapped],bx\r
 199                 mov     ah,EMS_ALLOCPAGES                       // allocate up to 64k of EMS\r
 200                 int     EMS_INT\r
 201                 or      ah,ah\r
 202                 jnz     error\r
 203                 mov     [EMShandle],dx\r
 204                 jmp End\r
 205 error:\r
 206                 mov     errorflag,1\r
 207                 jmp End\r
 208 noEMS:\r
 209 End:\r
 210         }\r
 211         if(errorflag==true)\r
 212         {\r
 213                 err = CPURegs.h.ah;\r
 214                 strcpy(str,"MML_SetupEMS: EMS error 0x");\r
 215                 itoa(err,str2,16);\r
 216                 strcpy(str,str2);\r
 217                 printf("%s\n",str);
 218                 return err;\r
 219         }
 220         return 0;\r
 221 }\r
 222 \r
 223 \r
 224 /*\r
 225 ======================\r
 226 =\r
 227 = MML_ShutdownEMS\r
 228 =\r
 229 =======================\r
 230 */\r
 231 \r
 232 void MML_ShutdownEMS (void)\r
 233 {\r
 234         boolean errorflag=false;\r
 235         if (!EMShandle)\r
 236                 return;\r
 237         __asm\r
 238         {\r
 239                 mov     ah,EMS_FREEPAGES\r
 240                 mov     dx,[EMShandle]\r
 241                 int     EMS_INT\r
 242                 or      ah,ah\r
 243                 jz      ok\r
 244                 mov     errorflag,1\r
 245                 ok:\r
 246         }\r
 247         if(errorflag==true) printf("MML_ShutdownEMS: Error freeing EMS!");      //++++ add something\r
 248 }\r
 249 \r
 250 /*\r
 251 ====================\r
 252 =\r
 253 = MM_MapEMS\r
 254 =\r
 255 = Maps the 64k of EMS used by memory manager into the page frame\r
 256 = for general use.  This only needs to be called if you are keeping\r
 257 = other things in EMS.\r
 258 =\r
 259 ====================\r
 260 */\r
 261 \r
 262 unsigned MM_MapEMS (void)\r
 263 {\r
 264         char    str[80],str2[10];\r
 265         unsigned        err;\r
 266         boolean errorflag=false;\r
 267         int     i;\r
 268         union REGS CPURegs;\r
 269 \r
 270         for (i=0;i<EMSpagesmapped;i++)\r
 271         {\r
 272                 __asm\r
 273                 {\r
 274                         mov     ah,EMS_MAPPAGE\r
 275                         mov     bx,[i]                  // logical page\r
 276                         mov     al,bl                   // physical page\r
 277                         mov     dx,[EMShandle]  // handle\r
 278                         int     EMS_INT\r
 279                         or      ah,ah\r
 280                         jnz     error\r
 281                         jmp End\r
 282                         error:\r
 283                         mov     errorflag,1\r
 284                         End:\r
 285                 }\r
 286                 if(errorflag==true)\r
 287                 {\r
 288                         err = CPURegs.h.ah;\r
 289                         strcpy(str,"MM_MapEMS: EMS error 0x");\r
 290                         itoa(err,str2,16);\r
 291                         strcpy(str,str2);\r
 292                         printf("%s\n",str);
 293                         return err;\r
 294                 }\r
 295         }\r
 296         return 0;\r
 297 }\r
 298 \r
 299 //==========================================================================\r
 300 \r
 301 /*\r
 302 ======================\r
 303 =\r
 304 = MML_CheckForXMS\r
 305 =\r
 306 = Check for XMM driver\r
 307 =\r
 308 =======================\r
 309 */\r
 310 \r
 311 boolean MML_CheckForXMS (void)\r
 312 {\r
 313         boolean errorflag=false;\r
 314         numUMBs = 0;\r
 315 \r
 316         __asm\r
 317         {\r
 318                 mov     ax,0x4300\r
 319                 int     0x2f                            // query status of installed diver\r
 320                 cmp     al,0x80\r
 321                 je      good\r
 322                 mov     errorflag,1\r
 323                 good:\r
 324         }\r
 325         if(errorflag==true) return false;\r
 326         else return true;\r
 327 }\r
 328 \r
 329 \r
 330 /*\r
 331 ======================\r
 332 =\r
 333 = MML_SetupXMS\r
 334 =\r
 335 = Try to allocate all upper memory block\r
 336 =\r
 337 =======================\r
 338 */\r
 339 \r
 340 void MML_SetupXMS (void)\r
 341 {\r
 342         unsigned        base,size;\r
 343 \r
 344         __asm\r
 345         {\r
 346                 mov     ax,0x4310\r
 347                 int     0x2f\r
 348                 mov     [WORD PTR XMSaddr],bx\r
 349                 mov     [WORD PTR XMSaddr+2],es         // function pointer to XMS driver\r
 350         }\r
 351 getmemory:\r
 352         __asm\r
 353         {\r
 354                 mov     ah,XMS_ALLOCUMB\r
 355                 mov     dx,0xffff                                       // try for largest block possible\r
 356                 call    [DWORD PTR XMSaddr]\r
 357                 or      ax,ax\r
 358                 jnz     gotone\r
 359 \r
 360                 cmp     bl,0xb0                                         // error: smaller UMB is available\r
 361                 jne     done;\r
 362 \r
 363                 mov     ah,XMS_ALLOCUMB\r
 364                 call    [DWORD PTR XMSaddr]             // DX holds largest available UMB\r
 365                 or      ax,ax\r
 366                 jz      done                                            // another error...\r
 367 \r
 368 gotone:\r
 369                 mov     [base],bx\r
 370                 mov     [size],dx\r
 371 done:\r
 372         }\r
 373         MML_UseSpace (base,size);\r
 374         mminfo.XMSmem += size*16;\r
 375         UMBbase[numUMBs] = base;\r
 376         numUMBs++;\r
 377         if (numUMBs < MAXUMBS)\r
 378                 goto getmemory;\r
 379 }\r
 380 \r
 381 \r
 382 /*\r
 383 ======================\r
 384 =\r
 385 = MML_ShutdownXMS\r
 386 =\r
 387 ======================\r
 388 */\r
 389 \r
 390 void MML_ShutdownXMS (void)\r
 391 {\r
 392         int     i;\r
 393         unsigned        base;\r
 394 \r
 395         for (i=0;i<numUMBs;i++)\r
 396         {\r
 397                 base = UMBbase[i];\r
 398                 __asm\r
 399                 {\r
 400                         mov     ah,XMS_FREEUMB\r
 401                         mov     dx,[base]\r
 402                         call    [DWORD PTR XMSaddr]\r
 403                 }\r
 404         }\r
 405 }\r
 406 \r
 407 //==========================================================================\r
 408 \r
 409 /*\r
 410 ======================\r
 411 =\r
 412 = MML_UseSpace\r
 413 =\r
 414 = Marks a range of paragraphs as usable by the memory manager\r
 415 = This is used to mark space for the near heap, far heap, ems page frame,\r
 416 = and upper memory blocks\r
 417 =\r
 418 ======================\r
 419 */\r
 420 \r
 421 void MML_UseSpace (unsigned segstart, unsigned seglength)\r
 422 {\r
 423         mmblocktype far *scan,far *last;\r
 424         unsigned        oldend;\r
 425         long            extra;\r
 426 \r
 427         scan = last = mmhead;\r
 428         mmrover = mmhead;               // reset rover to start of memory\r
 429 \r
 430 //\r
 431 // search for the block that contains the range of segments\r
 432 //\r
 433         while (scan->start+scan->length < segstart)\r
 434         {\r
 435                 last = scan;\r
 436                 scan = scan->next;\r
 437         }\r
 438 \r
 439 //\r
 440 // take the given range out of the block\r
 441 //\r
 442         oldend = scan->start + scan->length;\r
 443         extra = oldend - (segstart+seglength);\r
 444         if (extra < 0)\r
 445         {\r
 446                 printf("MML_UseSpace: Segment spans two blocks!");\r
 447                 return;\r
 448         }\r
 449 \r
 450 \r
 451         if (segstart == scan->start)\r
 452         {\r
 453                 last->next = scan->next;                        // unlink block\r
 454                 FREEBLOCK(scan);\r
 455                 scan = last;\r
 456         }\r
 457         else\r
 458                 scan->length = segstart-scan->start;    // shorten block\r
 459 \r
 460         if (extra > 0)\r
 461         {\r
 462                 GETNEWBLOCK;\r
 463                 mmnew->next = scan->next;\r
 464                 scan->next = mmnew;\r
 465                 mmnew->start = segstart+seglength;\r
 466                 mmnew->length = extra;\r
 467                 mmnew->attributes = LOCKBIT;\r
 468         }\r
 469 \r
 470 }\r
 471 \r
 472 //==========================================================================\r
 473 \r
 474 /*\r
 475 ====================\r
 476 =\r
 477 = MML_ClearBlock\r
 478 =\r
 479 = We are out of blocks, so free a purgable block\r
 480 =\r
 481 ====================\r
 482 */\r
 483 \r
 484 void MML_ClearBlock (void)\r
 485 {\r
 486         mmblocktype far *scan,far *last;\r
 487 \r
 488         scan = mmhead->next;\r
 489 \r
 490         while (scan)\r
 491         {\r
 492                 if (!(scan->attributes&LOCKBIT) && (scan->attributes&PURGEBITS) )\r
 493                 {\r
 494                         MM_FreePtr(scan->useptr);\r
 495                         return;\r
 496                 }\r
 497                 scan = scan->next;\r
 498         }\r
 499 \r
 500         printf("MM_ClearBlock: No purgable blocks!");\r
 501 }\r
 502 \r
 503 \r
 504 //==========================================================================\r
 505 \r
 506 /*\r
 507 ===================\r
 508 =\r
 509 = MM_Startup\r
 510 =\r
 511 = Grabs all space from turbo with malloc/farmalloc\r
 512 = Allocates bufferseg misc buffer\r
 513 =\r
 514 ===================\r
 515 */\r
 516 \r
 517 void MM_Startup (void)\r
 518 {\r
 519         int i;\r
 520         dword length;\r
 521         void far        *start;\r
 522         unsigned        segstart,seglength,endfree;\r
 523 \r
 524         if (mminfo.mmstarted)\r
 525                 MM_Shutdown ();\r
 526 \r
 527 \r
 528         mminfo.mmstarted = true;\r
 529         mminfo.bombonerror = true;\r
 530 //\r
 531 // set up the linked list (everything in the free list;\r
 532 //\r
 533         mmhead = NULL;\r
 534         mmfree = &mmblocks[0];\r
 535         for (i=0;i<MAXBLOCKS-1;i++)\r
 536                 mmblocks[i].next = &mmblocks[i+1];\r
 537         mmblocks[i].next = NULL;\r
 538 \r
 539 //\r
 540 // locked block of all memory until we punch out free space\r
 541 //\r
 542         GETNEWBLOCK;\r
 543         mmhead = mmnew;                         // this will allways be the first node\r
 544         mmnew->start = 0;\r
 545         mmnew->length = 0xffff;\r
 546         mmnew->attributes = LOCKBIT;\r
 547         mmnew->next = NULL;\r
 548         mmrover = mmhead;\r
 549 \r
 550 \r
 551 //\r
 552 // get all available near conventional memory segments\r
 553 //\r
 554 //----  length=coreleft();\r
 555         _nheapgrow();\r
 556         length=_memavl();\r
 557         start = (void far *)(nearheap = malloc(length));\r
 558 \r
 559         length -= 16-(FP_OFF(start)&15);\r
 560         length -= SAVENEARHEAP;\r
 561         seglength = length / 16;                        // now in paragraphs\r
 562         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;\r
 563         MML_UseSpace (segstart,seglength);\r
 564         mminfo.nearheap = length;\r
 565 \r
 566 //\r
 567 // get all available far conventional memory segments\r
 568 //\r
 569 //----  length=farcoreleft();\r
 570         _fheapgrow();\r
 571         length=_memavl();\r
 572         start = farheap = _fmalloc(length);\r
 573         length -= 16-(FP_OFF(start)&15);\r
 574         length -= SAVEFARHEAP;\r
 575         seglength = length / 16;                        // now in paragraphs\r
 576         segstart = FP_SEG(start)+(FP_OFF(start)+15)/16;\r
 577         MML_UseSpace (segstart,seglength);\r
 578         mminfo.farheap = length;\r
 579         mminfo.mainmem = mminfo.nearheap + mminfo.farheap;\r
 580 \r
 581 \r
 582 //\r
 583 // detect EMS and allocate up to 64K at page frame\r
 584 //\r
 585         mminfo.EMSmem = 0;\r
 586         for (i = 1;i < __argc;i++)\r
 587         {\r
 588                 if ( US_CheckParm(__argv[i],ParmStringsexmm) == 0)\r
 589                         goto emsskip;                           // param NOEMS\r
 590         }\r
 591 \r
 592         if (MML_CheckForEMS())\r
 593         {\r
 594                 //printf("EMS1\n");\r
 595                 MML_SetupEMS();                                 // allocate space\r
 596                 //printf("EMS2\n");\r
 597                 MML_UseSpace (EMSpageframe,EMSpagesmapped*0x400);\r
 598                 //printf("EMS3\n");\r
 599                 MM_MapEMS();                                    // map in used pages\r
 600                 //printf("EMS4\n");\r
 601                 mminfo.EMSmem = EMSpagesmapped*0x4000l;\r
 602         }\r
 603 \r
 604 //\r
 605 // detect XMS and get upper memory blocks\r
 606 //\r
 607 emsskip:\r
 608         mminfo.XMSmem = 0;\r
 609         for (i = 1;i < __argc;i++)\r
 610         {\r
 611                 if ( US_CheckParm(__argv[i],ParmStringsexmm) == 0)\r
 612                         goto xmsskip;                           // param NOXMS\r
 613         }\r
 614 \r
 615         if (MML_CheckForXMS())\r
 616         {\r
 617 //              printf("XMS!\n");\r
 618 //++++          MML_SetupXMS();                                 // allocate as many UMBs as possible\r
 619         }\r
 620 \r
 621 //\r
 622 // allocate the misc buffer\r
 623 //\r
 624 xmsskip:\r
 625         mmrover = mmhead;               // start looking for space after low block\r
 626 \r
 627         MM_GetPtr (&bufferseg,BUFFERSIZE);\r
 628 }\r
 629 \r
 630 //==========================================================================\r
 631 \r
 632 /*\r
 633 ====================\r
 634 =\r
 635 = MM_Shutdown\r
 636 =\r
 637 = Frees all conventional, EMS, and XMS allocated\r
 638 =\r
 639 ====================\r
 640 */\r
 641 \r
 642 void MM_Shutdown (void)\r
 643 {\r
 644   if (!mminfo.mmstarted)\r
 645         return;\r
 646 \r
 647   _ffree (farheap);
 648   printf("far freed\n");\r
 649   free (nearheap);
 650   printf("near freed\n");\r
 651   //hfree(hugeheap);
 652   printf("huge freed\n");\r
 653   MML_ShutdownEMS ();
 654   printf("EMS freed\n");\r
 655 //++++  MML_ShutdownXMS ();
 656   printf("XMS freed\n");\r
 657 }\r
 658 \r
 659 //==========================================================================\r
 660 \r
 661 /*\r
 662 ====================\r
 663 =\r
 664 = MM_GetPtr\r
 665 =\r
 666 = Allocates an unlocked, unpurgable block\r
 667 =\r
 668 ====================\r
 669 */\r
 670 \r
 671 void MM_GetPtr (memptr *baseptr,dword size)\r
 672 {\r
 673         mmblocktype far *scan,far *lastscan,far *endscan\r
 674                                 ,far *purge,far *next;\r
 675         int                     search;\r
 676         unsigned        needed,startseg;\r
 677 \r
 678         needed = (size+15)/16;          // convert size from bytes to paragraphs\r
 679 \r
 680         GETNEWBLOCK;                            // fill in start and next after a spot is found\r
 681         mmnew->length = needed;\r
 682         mmnew->useptr = baseptr;\r
 683         mmnew->attributes = BASEATTRIBUTES;\r
 684 \r
 685         for (search = 0; search<3; search++)\r
 686         {\r
 687         //\r
 688         // first search:        try to allocate right after the rover, then on up\r
 689         // second search:       search from the head pointer up to the rover\r
 690         // third search:        compress memory, then scan from start\r
 691                 if (search == 1 && mmrover == mmhead)\r
 692                         search++;\r
 693 \r
 694                 switch (search)\r
 695                 {\r
 696                 case 0:\r
 697                         lastscan = mmrover;\r
 698                         scan = mmrover->next;\r
 699                         endscan = NULL;\r
 700                         break;\r
 701                 case 1:\r
 702                         lastscan = mmhead;\r
 703                         scan = mmhead->next;\r
 704                         endscan = mmrover;\r
 705                         break;\r
 706                 case 2:\r
 707                         MM_SortMem ();\r
 708                         lastscan = mmhead;\r
 709                         scan = mmhead->next;\r
 710                         endscan = NULL;\r
 711                         break;\r
 712                 }\r
 713 \r
 714                 startseg = lastscan->start + lastscan->length;\r
 715 \r
 716                 while (scan != endscan)\r
 717                 {\r
 718                         if (scan->start - startseg >= needed)\r
 719                         {\r
 720                         //\r
 721                         // got enough space between the end of lastscan and\r
 722                         // the start of scan, so throw out anything in the middle\r
 723                         // and allocate the new block\r
 724                         //\r
 725                                 purge = lastscan->next;\r
 726                                 lastscan->next = mmnew;\r
 727                                 mmnew->start = *(unsigned *)baseptr = startseg;\r
 728                                 mmnew->next = scan;\r
 729                                 while ( purge != scan)\r
 730                                 {       // free the purgable block\r
 731                                         next = purge->next;\r
 732                                         FREEBLOCK(purge);\r
 733                                         purge = next;           // purge another if not at scan\r
 734                                 }\r
 735                                 mmrover = mmnew;\r
 736                                 return; // good allocation!\r
 737                         }\r
 738 \r
 739                         //\r
 740                         // if this block is purge level zero or locked, skip past it\r
 741                         //\r
 742                         if ( (scan->attributes & LOCKBIT)\r
 743                                 || !(scan->attributes & PURGEBITS) )\r
 744                         {\r
 745                                 lastscan = scan;\r
 746                                 startseg = lastscan->start + lastscan->length;\r
 747                         }\r
 748 \r
 749 \r
 750                         scan=scan->next;                // look at next line\r
 751                 }\r
 752         }\r
 753 \r
 754         if (mminfo.bombonerror)\r
 755                 printf(OUT_OF_MEM_MSG,(size-mminfo.nearheap));\r
 756         else\r
 757                 mminfo.mmerror = true;\r
 758 }\r
 759 \r
 760 //==========================================================================\r
 761 \r
 762 /*\r
 763 ====================\r
 764 =\r
 765 = MM_FreePtr\r
 766 =\r
 767 = Allocates an unlocked, unpurgable block\r
 768 =\r
 769 ====================\r
 770 */\r
 771 \r
 772 void MM_FreePtr (memptr *baseptr)\r
 773 {\r
 774         mmblocktype far *scan,far *last;\r
 775 \r
 776         last = mmhead;\r
 777         scan = last->next;\r
 778 \r
 779         if (baseptr == mmrover->useptr) // removed the last allocated block\r
 780                 mmrover = mmhead;\r
 781 \r
 782         while (scan->useptr != baseptr && scan)\r
 783         {\r
 784                 last = scan;\r
 785                 scan = scan->next;\r
 786         }\r
 787 \r
 788         if (!scan)\r
 789         {\r
 790                 printf("MM_FreePtr: Block not found!");\r
 791                 return;\r
 792         }\r
 793 \r
 794         last->next = scan->next;\r
 795 \r
 796         FREEBLOCK(scan);\r
 797 }\r
 798 //==========================================================================\r
 799 \r
 800 /*\r
 801 =====================\r
 802 =\r
 803 = MM_SetPurge\r
 804 =\r
 805 = Sets the purge level for a block (locked blocks cannot be made purgable)\r
 806 =\r
 807 =====================\r
 808 */\r
 809 \r
 810 void MM_SetPurge (memptr *baseptr, int purge)\r
 811 {\r
 812         mmblocktype far *start;\r
 813 \r
 814         start = mmrover;\r
 815 \r
 816         do\r
 817         {\r
 818                 if (mmrover->useptr == baseptr)\r
 819                         break;\r
 820 \r
 821                 mmrover = mmrover->next;\r
 822 \r
 823                 if (!mmrover)\r
 824                         mmrover = mmhead;\r
 825                 else if (mmrover == start)\r
 826                 {\r
 827                         printf("MM_SetPurge: Block not found!");\r
 828                         return;\r
 829                 }\r
 830 \r
 831         } while (1);\r
 832 \r
 833         mmrover->attributes &= ~PURGEBITS;\r
 834         mmrover->attributes |= purge;\r
 835 }\r
 836 \r
 837 //==========================================================================\r
 838 \r
 839 /*\r
 840 =====================\r
 841 =\r
 842 = MM_SetLock\r
 843 =\r
 844 = Locks / unlocks the block\r
 845 =\r
 846 =====================\r
 847 */\r
 848 \r
 849 void MM_SetLock (memptr *baseptr, boolean locked)\r
 850 {\r
 851         mmblocktype far *start;\r
 852 \r
 853         start = mmrover;\r
 854 \r
 855         do\r
 856         {\r
 857                 if (mmrover->useptr == baseptr)\r
 858                         break;\r
 859 \r
 860                 mmrover = mmrover->next;\r
 861 \r
 862                 if (!mmrover)\r
 863                         mmrover = mmhead;\r
 864                 else if (mmrover == start)\r
 865                 {\r
 866                         printf("MM_SetLock: Block not found!");\r
 867                         return;\r
 868                 }\r
 869 \r
 870         } while (1);\r
 871 \r
 872         mmrover->attributes &= ~LOCKBIT;\r
 873         mmrover->attributes |= locked*LOCKBIT;\r
 874 }\r
 875 \r
 876 //==========================================================================\r
 877 \r
 878 /*\r
 879 =====================\r
 880 =\r
 881 = MM_SortMem\r
 882 =\r
 883 = Throws out all purgable stuff and compresses movable blocks\r
 884 =\r
 885 =====================\r
 886 */\r
 887 \r
 888 void MM_SortMem (void)\r
 889 {\r
 890         mmblocktype far *scan,far *last,far *next;\r
 891         unsigned        start,length,source,dest,oldborder;\r
 892         int                     playing;\r
 893 \r
 894         //\r
 895         // lock down a currently playing sound\r
 896         //\r
 897 /*++++  playing = SD_SoundPlaying ();\r
 898         if (playing)\r
 899         {\r
 900                 switch (SoundMode)\r
 901                 {\r
 902                 case sdm_PC:\r
 903                         playing += STARTPCSOUNDS;\r
 904                         break;\r
 905                 case sdm_AdLib:\r
 906                         playing += STARTADLIBSOUNDS;\r
 907                         break;\r
 908                 }\r
 909                 MM_SetLock(&(memptr)audiosegs[playing],true);\r
 910         }\r
 911 \r
 912 \r
 913         SD_StopSound();*/\r
 914 //      oldborder = bordercolor;\r
 915 //      VW_ColorBorder (15);\r
 916 \r
 917         if (beforesort)\r
 918                 beforesort();\r
 919 \r
 920         scan = mmhead;\r
 921 \r
 922         last = NULL;            // shut up compiler warning\r
 923 \r
 924         while (scan)\r
 925         {\r
 926                 if (scan->attributes & LOCKBIT)\r
 927                 {\r
 928                 //\r
 929                 // block is locked, so try to pile later blocks right after it\r
 930                 //\r
 931                         start = scan->start + scan->length;\r
 932                 }\r
 933                 else\r
 934                 {\r
 935                         if (scan->attributes & PURGEBITS)\r
 936                         {\r
 937                         //\r
 938                         // throw out the purgable block\r
 939                         //\r
 940                                 next = scan->next;\r
 941                                 FREEBLOCK(scan);\r
 942                                 last->next = next;\r
 943                                 scan = next;\r
 944                                 continue;\r
 945                         }\r
 946                         else\r
 947                         {\r
 948                         //\r
 949                         // push the non purgable block on top of the last moved block\r
 950                         //\r
 951                                 if (scan->start != start)\r
 952                                 {\r
 953                                         length = scan->length;\r
 954                                         source = scan->start;\r
 955                                         dest = start;\r
 956                                         while (length > 0xf00)\r
 957                                         {\r
 958                                                 movedata(source,0,dest,0,0xf00*16);\r
 959                                                 length -= 0xf00;\r
 960                                                 source += 0xf00;\r
 961                                                 dest += 0xf00;\r
 962                                         }\r
 963                                         movedata(source,0,dest,0,length*16);\r
 964 \r
 965                                         scan->start = start;\r
 966                                         *(unsigned *)scan->useptr = start;\r
 967                                 }\r
 968                                 start = scan->start + scan->length;\r
 969                         }\r
 970                 }\r
 971 \r
 972                 last = scan;\r
 973                 scan = scan->next;              // go to next block\r
 974         }\r
 975 \r
 976         mmrover = mmhead;\r
 977 \r
 978         if (aftersort)\r
 979                 aftersort();\r
 980 \r
 981 //      VW_ColorBorder (oldborder);\r
 982 \r
 983 /*++++  if (playing)\r
 984                 MM_SetLock(&(memptr)audiosegs[playing],false);*/\r
 985 }\r
 986 \r
 987 \r
 988 //==========================================================================\r
 989 \r
 990 //****#if 0\r
 991 /*\r
 992 =====================\r
 993 =\r
 994 = MM_ShowMemory\r
 995 =\r
 996 =====================\r
 997 */\r
 998 \r
 999 void MM_ShowMemory (void)\r
1000 {\r
1001         mmblocktype far *scan;\r
1002         unsigned color,temp;//, i;\r
1003         long    end,owner;\r
1004         char    scratch[80],str[10];\r
1005 \r
1006 //****  VW_SetDefaultColors();\r
1007 //****  VW_SetLineWidth(40);\r
1008 //++++mh        temp = bufferofs;\r
1009 //++++mh        bufferofs = 0;\r
1010 //****  VW_SetScreen (0,0);\r
1011 \r
1012         scan = mmhead;\r
1013 \r
1014         end = -1;\r
1015 \r
1016 //CA_OpenDebug ();\r
1017 \r
1018         while (scan)\r
1019         {\r
1020                 if (scan->attributes & PURGEBITS)\r
1021                         color = 5;              // dark purple = purgable\r
1022                 else\r
1023                         color = 9;              // medium blue = non purgable\r
1024                 if (scan->attributes & LOCKBIT)\r
1025                         color = 12;             // red = locked\r
1026                 if (scan->start<=end)\r
1027                 {\r
1028                         printf("MM_ShowMemory: Memory block order currupted!");\r
1029                         return;\r
1030                 }\r
1031                 end = scan->start+scan->length-1;\r
1032 //++++          VW_Hlin(scan->start,(unsigned)end,0,color);\r
1033 //++++          VW_Plot(scan->start,0,15);\r
1034                 if (scan->next->start > end+1)\r
1035 //++++                  VW_Hlin(end+1,scan->next->start,0,0);   // black = free\r
1036 \r
1037 //****#if 0\r
1038 printf("Location:");\r
1039 printf("%Fp\t", scan->start);\r
1040 strcpy (scratch,"Size:");\r
1041 ltoa ((long)scan->length*16,str,10);\r
1042 strcat (scratch,str);\r
1043 strcat (scratch,"\tOwner:0x");\r
1044 owner = (unsigned)scan->useptr;\r
1045 ultoa (owner,str,16);\r
1046 strcat (scratch,str);\r
1047 strcat (scratch,"\n");\r
1048 //++++write (debughandle,scratch,strlen(scratch));\r
1049 fprintf(stdout, "%s", scratch);\r
1050 //****#endif\r
1051 \r
1052                 scan = scan->next;\r
1053         }\r
1054 \r
1055 //CA_CloseDebug ();\r
1056 \r
1057 //++++mh        IN_Ack();\r
1058 //****  VW_SetLineWidth(64);\r
1059 //++++mh        bufferofs = temp;\r
1060 }\r
1061 //****#endif\r
1062 \r
1063 //==========================================================================\r
1064 \r
1065 \r
1066 /*\r
1067 ======================\r
1068 =\r
1069 = MM_UnusedMemory\r
1070 =\r
1071 = Returns the total free space without purging\r
1072 =\r
1073 ======================\r
1074 */\r
1075 \r
1076 dword MM_UnusedMemory (void)\r
1077 {\r
1078         unsigned free;\r
1079         mmblocktype far *scan;\r
1080 \r
1081         free = 0;\r
1082         scan = mmhead;\r
1083 \r
1084         while (scan->next)\r
1085         {\r
1086                 free += scan->next->start - (scan->start + scan->length);\r
1087                 scan = scan->next;\r
1088         }\r
1089 \r
1090         return free*16l;\r
1091 //      return free;\r
1092 }\r
1093 \r
1094 //==========================================================================\r
1095 \r
1096 \r
1097 /*\r
1098 ======================\r
1099 =\r
1100 = MM_TotalFree\r
1101 =\r
1102 = Returns the total free space with purging\r
1103 =\r
1104 ======================\r
1105 */\r
1106 \r
1107 dword MM_TotalFree (void)\r
1108 {\r
1109         unsigned free;\r
1110         mmblocktype far *scan;\r
1111 \r
1112         free = 0;\r
1113         scan = mmhead;\r
1114 \r
1115         while (scan->next)\r
1116         {\r
1117                 if ((scan->attributes&PURGEBITS) && !(scan->attributes&LOCKBIT))\r
1118                         free += scan->length;\r
1119                 free += scan->next->start - (scan->start + scan->length);\r
1120                 scan = scan->next;\r
1121         }\r
1122 \r
1123         return free*16l;\r
1124 //      return free;\r
1125 }\r
1126 \r
1127 //==========================================================================\r
1128 \r
1129 /*\r
1130 =====================\r
1131 =\r
1132 = MM_Report\r
1133 =\r
1134 =====================\r
1135 */\r
1136 \r
1137 void MM_Report(void)\r
1138 {\r
1139         printf("EMM %x available\n", EMSVer);\r
1140         printf("totalEMSpages=%u\n", totalEMSpages);\r
1141         printf("freeEMSpages=%u\n", freeEMSpages);\r
1142         printf("EMSpageframe=%Fp\n", EMSpageframe);\r
1143         printf("near=%lu\n", mminfo.nearheap);\r
1144         printf("far=%lu\n", mminfo.farheap);\r
1145         printf("EMSmem=%lu\n", mminfo.EMSmem);\r
1146         printf("XMSmem=%lu\n", mminfo.XMSmem);\r
1147         printf("mainmem=%lu\n", mminfo.mainmem);\r
1148         printf("UnusedMemory=%lu\n", MM_UnusedMemory());\r
1149         printf("TotalFree=%lu\n", MM_TotalFree());\r
1150 //      printf("\n");\r
1151 //      printf("UnusedMemory=%lu kb\n", MM_UnusedMemory()/10248);\r
1152 //      printf("TotalFree=%lu kb\n", MM_TotalFree()/10248);\r
1153 }\r
1154 \r
1155 //==========================================================================\r
1156 \r
1157 /*\r
1158 =====================\r
1159 =\r
1160 = MM_EMSVer\r
1161 =\r
1162 =====================\r
1163 \r
1164 \r
1165 int MM_EMSVer(void)\r
1166 {\r
1167         int EMSver;\r
1168         __asm\r
1169         {\r
1170                 mov             ah,EMS_VERSION\r
1171                 int             EMS_INT\r
1172                 mov             EMSver,ax\r
1173         }\r
1174         return(EMSver);\r
1175 }*/\r
1176 \r
1177 //==========================================================================\r
1178 \r
1179 /*\r
1180 =====================\r
1181 =\r
1182 = MM_BombOnError\r
1183 =\r
1184 =====================\r
1185 */\r
1186 \r
1187 void MM_BombOnError (boolean bomb)\r
1188 {\r
1189         mminfo.bombonerror = bomb;\r
1190 }\r