msdos/dpmi.c

   1 /*
   2  * DPMI 0.9 emulation
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #ifdef HAVE_UNISTD_H
  25 # include <unistd.h>
  26 #endif
  27 #include <string.h>
  28
  29 #include "windef.h"
  30 #include "wine/winbase16.h"
  31 #include "miscemu.h"
  32 #include "msdos.h"
  33 #include "task.h"
  34 #include "toolhelp.h"
  35 #include "selectors.h"
  36 #include "callback.h"
  37 #include "wine/debug.h"
  38 #include "stackframe.h"
  39
  40 WINE_DEFAULT_DEBUG_CHANNEL(int31);
  41
  42 #define DOS_GET_DRIVE(reg) ((reg) ? (reg) - 1 : DRIVE_GetCurrentDrive())
  43
  44 void CreateBPB(int drive, BYTE *data, BOOL16 limited);  /* defined in int21.c */
  45
  46 static void* lastvalloced = NULL;
  47
  48
  49 DOSVM_TABLE Dosvm = { NULL, };
  50
  51 static HMODULE DosModule;
  52
  53 /**********************************************************************
  54  *          DPMI_LoadDosSystem
  55  */
  56 BOOL DPMI_LoadDosSystem(void)
  57 {
  58     if (DosModule) return TRUE;
  59     DosModule = LoadLibraryA( "winedos.dll" );
  60     if (!DosModule) {
  61         ERR("could not load winedos.dll, DOS subsystem unavailable\n");
  62         return FALSE;
  63     }
  64 #define GET_ADDR(func)  Dosvm.func = (void *)GetProcAddress(DosModule, #func);
  65
  66     GET_ADDR(LoadDosExe);
  67     GET_ADDR(CallRMInt);
  68     GET_ADDR(CallRMProc);
  69     GET_ADDR(AllocRMCB);
  70     GET_ADDR(FreeRMCB);
  71     GET_ADDR(RawModeSwitch);
  72     GET_ADDR(SetTimer);
  73     GET_ADDR(GetTimer);
  74     GET_ADDR(inport);
  75     GET_ADDR(outport);
  76     GET_ADDR(ASPIHandler);
  77     GET_ADDR(EmulateInterruptPM);
  78 #undef GET_ADDR
  79     return TRUE;
  80 }
  81
  82 /**********************************************************************
  83  *          DPMI_xalloc
  84  * special virtualalloc, allocates lineary monoton growing memory.
  85  * (the usual VirtualAlloc does not satisfy that restriction)
  86  */
  87 static LPVOID
  88 DPMI_xalloc(int len) {
  89         LPVOID  ret;
  90         LPVOID  oldlastv = lastvalloced;
  91
  92         if (lastvalloced) {
  93                 int     xflag = 0;
  94                 ret = NULL;
  95                 while (!ret) {
  96                         ret=VirtualAlloc(lastvalloced,len,MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
  97                         if (!ret)
  98                                 lastvalloced = (char *) lastvalloced + 0x10000;
  99                         /* we failed to allocate one in the first round.
 100                          * try non-linear
 101                          */
 102                         if (!xflag && (lastvalloced<oldlastv)) { /* wrapped */
 103                                 FIXME("failed to allocate lineary growing memory (%d bytes), using non-linear growing...\n",len);
 104                                 xflag++;
 105                         }
 106                         /* if we even fail to allocate something in the next
 107                          * round, return NULL
 108                          */
 109                         if ((xflag==1) && (lastvalloced >= oldlastv))
 110                                 xflag++;
 111                         if ((xflag==2) && (lastvalloced < oldlastv)) {
 112                                 FIXME("failed to allocate any memory of %d bytes!\n",len);
 113                                 return NULL;
 114                         }
 115                 }
 116         } else
 117                  ret=VirtualAlloc(NULL,len,MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
 118         lastvalloced = (LPVOID)(((DWORD)ret+len+0xffff)&~0xffff);
 119         return ret;
 120 }
 121
 122 static void
 123 DPMI_xfree(LPVOID ptr) {
 124         VirtualFree(ptr,0,MEM_RELEASE);
 125 }
 126
 127 /* FIXME: perhaps we could grow this mapped area... */
 128 static LPVOID
 129 DPMI_xrealloc(LPVOID ptr,DWORD newsize) {
 130         MEMORY_BASIC_INFORMATION        mbi;
 131         LPVOID                          newptr;
 132
 133         newptr = DPMI_xalloc(newsize);
 134         if (ptr) {
 135                 if (!VirtualQuery(ptr,&mbi,sizeof(mbi))) {
 136                         FIXME("realloc of DPMI_xallocd region %p?\n",ptr);
 137                         return NULL;
 138                 }
 139                 if (mbi.State == MEM_FREE) {
 140                         FIXME("realloc of DPMI_xallocd region %p?\n",ptr);
 141                         return NULL;
 142                 }
 143                 /* We do not shrink allocated memory. most reallocs
 144                  * only do grows anyway
 145                  */
 146                 if (newsize<=mbi.RegionSize)
 147                         return ptr;
 148                 memcpy(newptr,ptr,mbi.RegionSize);
 149                 DPMI_xfree(ptr);
 150         }
 151         return newptr;
 152 }
 153
 154 /**********************************************************************
 155  *          CallRMInt
 156  */
 157 static void CallRMInt( CONTEXT86 *context )
 158 {
 159     if (!Dosvm.CallRMInt && !DPMI_LoadDosSystem())
 160     {
 161         ERR("could not setup real-mode calls\n");
 162         return;
 163     }
 164     Dosvm.CallRMInt( context );
 165 }
 166
 167
 168 static void CallRMProc( CONTEXT86 *context, int iret )
 169 {
 170     if (!Dosvm.CallRMProc && !DPMI_LoadDosSystem())
 171     {
 172         ERR("could not setup real-mode calls\n");
 173         return;
 174     }
 175     Dosvm.CallRMProc( context, iret );
 176 }
 177
 178 static void AllocRMCB( CONTEXT86 *context )
 179 {
 180     if (!Dosvm.AllocRMCB && !DPMI_LoadDosSystem())
 181     {
 182         ERR("could not setup real-mode calls\n");
 183         return;
 184     }
 185     Dosvm.AllocRMCB( context );
 186 }
 187
 188 static void FreeRMCB( CONTEXT86 *context )
 189 {
 190     if (!Dosvm.FreeRMCB)  /* cannot have allocated one if dosvm not loaded */
 191     {
 192         SET_LOWORD( context->Eax, 0x8024 ); /* invalid callback address */
 193         SET_CFLAG( context );
 194     }
 195     else Dosvm.FreeRMCB( context );
 196 }
 197
 198 static void RawModeSwitch( CONTEXT86 *context )
 199 {
 200     if (!Dosvm.RawModeSwitch)
 201     {
 202       ERR("could not setup real-mode calls\n");
 203       return;
 204     }
 205     else
 206     {
 207       /*
 208        * FIXME: This routine will not work if it is called
 209        *        from 32 bit DPMI program and the program returns
 210        *        to protected mode while ESP or EIP is over 0xffff.
 211        * FIXME: This routine will not work if it is not called
 212        *        using 16-bit-to-Wine callback glue function.
 213        */
 214       STACK16FRAME frame = *CURRENT_STACK16;
 215
 216       Dosvm.RawModeSwitch( context );
 217
 218       /*
 219        * After this function returns to relay code, protected mode
 220        * 16 bit stack will contain STACK16FRAME and single WORD
 221        * (EFlags, see next comment).
 222        */
 223       NtCurrentTeb()->cur_stack =
 224         MAKESEGPTR( context->SegSs,
 225                     context->Esp - sizeof(STACK16FRAME) - sizeof(WORD) );
 226
 227       /*
 228        * After relay code returns to glue function, protected
 229        * mode 16 bit stack will contain interrupt return record:
 230        * IP, CS and EFlags. Since EFlags is ignored, it won't
 231        * need to be initialized.
 232        */
 233       context->Esp -= 3 * sizeof(WORD);
 234
 235       /*
 236        * Restore stack frame so that relay code won't be confused.
 237        * It should be noted that relay code overwrites IP and CS
 238        * in STACK16FRAME with values taken from current CONTEXT86.
 239        * These values are what is returned to glue function
 240        * (see previous comment).
 241        */
 242       *CURRENT_STACK16 = frame;
 243     }
 244 }
 245
 246 /**********************************************************************
 247  *          INT_Int31Handler (WPROCS.149)
 248  *
 249  * Handler for int 31h (DPMI).
 250  */
 251
 252 void WINAPI INT_Int31Handler( CONTEXT86 *context )
 253 {
 254     /*
 255      * Note: For Win32s processes, the whole linear address space is
 256      *       shifted by 0x10000 relative to the OS linear address space.
 257      *       See the comment in msdos/vxd.c.
 258      */
 259     DWORD dw;
 260     BYTE *ptr;
 261
 262     if (context->SegCs == DOSMEM_dpmi_segments.dpmi_sel) {
 263         RawModeSwitch( context );
 264         return;
 265     }
 266
 267     RESET_CFLAG(context);
 268     switch(AX_reg(context))
 269     {
 270     case 0x0000:  /* Allocate LDT descriptors */
 271         TRACE("allocate LDT descriptors (%d)\n",CX_reg(context));
 272         if (!(context->Eax = AllocSelectorArray16( CX_reg(context) )))
 273         {
 274             TRACE("failed\n");
 275             context->Eax = 0x8011;  /* descriptor unavailable */
 276             SET_CFLAG(context);
 277         }
 278         TRACE("success, array starts at 0x%04x\n",AX_reg(context));
 279         break;
 280
 281     case 0x0001:  /* Free LDT descriptor */
 282         TRACE("free LDT descriptor (0x%04x)\n",BX_reg(context));
 283         if (FreeSelector16( BX_reg(context) ))
 284         {
 285             context->Eax = 0x8022;  /* invalid selector */
 286             SET_CFLAG(context);
 287         }
 288         else
 289         {
 290             /* If a segment register contains the selector being freed, */
 291             /* set it to zero. */
 292             if (!((context->SegDs^BX_reg(context)) & ~3)) context->SegDs = 0;
 293             if (!((context->SegEs^BX_reg(context)) & ~3)) context->SegEs = 0;
 294             if (!((context->SegFs^BX_reg(context)) & ~3)) context->SegFs = 0;
 295             if (!((context->SegGs^BX_reg(context)) & ~3)) context->SegGs = 0;
 296         }
 297         break;
 298
 299     case 0x0002:  /* Real mode segment to descriptor */
 300         TRACE("real mode segment to descriptor (0x%04x)\n",BX_reg(context));
 301         {
 302             WORD entryPoint = 0;  /* KERNEL entry point for descriptor */
 303             switch(BX_reg(context))
 304             {
 305             case 0x0000: entryPoint = 183; break;  /* __0000H */
 306             case 0x0040: entryPoint = 193; break;  /* __0040H */
 307             case 0xa000: entryPoint = 174; break;  /* __A000H */
 308             case 0xb000: entryPoint = 181; break;  /* __B000H */
 309             case 0xb800: entryPoint = 182; break;  /* __B800H */
 310             case 0xc000: entryPoint = 195; break;  /* __C000H */
 311             case 0xd000: entryPoint = 179; break;  /* __D000H */
 312             case 0xe000: entryPoint = 190; break;  /* __E000H */
 313             case 0xf000: entryPoint = 194; break;  /* __F000H */
 314             default:
 315                 context->Eax = DOSMEM_AllocSelector(BX_reg(context));
 316                 break;
 317             }
 318             if (entryPoint)
 319                 context->Eax = LOWORD(GetProcAddress16( GetModuleHandle16( "KERNEL" ),
 320                                                         (LPCSTR)(ULONG_PTR)entryPoint ));
 321         }
 322         break;
 323
 324     case 0x0003:  /* Get next selector increment */
 325         TRACE("get selector increment (__AHINCR)\n");
 326         context->Eax = __AHINCR;
 327         break;
 328
 329     case 0x0004:  /* Lock selector (not supported) */
 330         FIXME("lock selector not supported\n");
 331         context->Eax = 0;  /* FIXME: is this a correct return value? */
 332         break;
 333
 334     case 0x0005:  /* Unlock selector (not supported) */
 335         FIXME("unlock selector not supported\n");
 336         context->Eax = 0;  /* FIXME: is this a correct return value? */
 337         break;
 338
 339     case 0x0006:  /* Get selector base address */
 340         TRACE("get selector base address (0x%04x)\n",BX_reg(context));
 341         if (!(dw = GetSelectorBase( BX_reg(context) )))
 342         {
 343             context->Eax = 0x8022;  /* invalid selector */
 344             SET_CFLAG(context);
 345         }
 346         else
 347         {
 348             SET_CX( context, HIWORD(W32S_WINE2APP(dw)) );
 349             SET_DX( context, LOWORD(W32S_WINE2APP(dw)) );
 350         }
 351         break;
 352
 353     case 0x0007:  /* Set selector base address */
 354         TRACE("set selector base address (0x%04x,0x%08lx)\n",
 355                      BX_reg(context),
 356                      W32S_APP2WINE(MAKELONG(DX_reg(context),CX_reg(context))));
 357         dw = W32S_APP2WINE(MAKELONG(DX_reg(context), CX_reg(context)));
 358         if (dw < 0x10000)
 359             /* app wants to access lower 64K of DOS memory, load DOS subsystem */
 360             DPMI_LoadDosSystem();
 361         SetSelectorBase(BX_reg(context), dw);
 362         break;
 363
 364     case 0x0008:  /* Set selector limit */
 365         TRACE("set selector limit (0x%04x,0x%08lx)\n",BX_reg(context),MAKELONG(DX_reg(context),CX_reg(context)));
 366         dw = MAKELONG( DX_reg(context), CX_reg(context) );
 367         SetSelectorLimit16( BX_reg(context), dw );
 368         break;
 369
 370     case 0x0009:  /* Set selector access rights */
 371         TRACE("set selector access rights(0x%04x,0x%04x)\n",BX_reg(context),CX_reg(context));
 372         SelectorAccessRights16( BX_reg(context), 1, CX_reg(context) );
 373         break;
 374
 375     case 0x000a:  /* Allocate selector alias */
 376         TRACE("allocate selector alias (0x%04x)\n",BX_reg(context));
 377         if (!SET_AX( context, AllocCStoDSAlias16( BX_reg(context) )))
 378         {
 379             SET_AX( context, 0x8011 );  /* descriptor unavailable */
 380             SET_CFLAG(context);
 381         }
 382         break;
 383
 384     case 0x000b:  /* Get descriptor */
 385         TRACE("get descriptor (0x%04x)\n",BX_reg(context));
 386         {
 387             LDT_ENTRY entry;
 388             wine_ldt_get_entry( LOWORD(context->Ebx), &entry);
 389             wine_ldt_set_base( &entry, (void*)W32S_WINE2APP(wine_ldt_get_base(&entry)) );
 390             /* FIXME: should use ES:EDI for 32-bit clients */
 391             *(LDT_ENTRY *)MapSL( MAKESEGPTR( context->SegEs, LOWORD(context->Edi) )) = entry;
 392         }
 393         break;
 394
 395     case 0x000c:  /* Set descriptor */
 396         TRACE("set descriptor (0x%04x)\n",BX_reg(context));
 397         {
 398             LDT_ENTRY entry = *(LDT_ENTRY *)MapSL(MAKESEGPTR( context->SegEs, LOWORD(context->Edi)));
 399             wine_ldt_set_base( &entry, (void*)W32S_APP2WINE(wine_ldt_get_base(&entry)) );
 400             wine_ldt_set_entry( LOWORD(context->Ebx), &entry );
 401         }
 402         break;
 403
 404     case 0x000d:  /* Allocate specific LDT descriptor */
 405         FIXME("allocate descriptor (0x%04x), stub!\n",BX_reg(context));
 406         SET_AX( context, 0x8011 ); /* descriptor unavailable */
 407         SET_CFLAG(context);
 408         break;
 409     case 0x0100:  /* Allocate DOS memory block */
 410         TRACE("allocate DOS memory block (0x%x paragraphs)\n",BX_reg(context));
 411         dw = GlobalDOSAlloc16((DWORD)BX_reg(context)<<4);
 412         if (dw) {
 413             SET_AX( context, HIWORD(dw) );
 414             SET_DX( context, LOWORD(dw) );
 415         } else {
 416             SET_AX( context, 0x0008 ); /* insufficient memory */
 417             SET_BX( context, DOSMEM_Available()>>4 );
 418             SET_CFLAG(context);
 419         }
 420         break;
 421     case 0x0101:  /* Free DOS memory block */
 422         TRACE("free DOS memory block (0x%04x)\n",DX_reg(context));
 423         dw = GlobalDOSFree16(DX_reg(context));
 424         if (!dw) {
 425             SET_AX( context, 0x0009 ); /* memory block address invalid */
 426             SET_CFLAG(context);
 427         }
 428         break;
 429     case 0x0200: /* get real mode interrupt vector */
 430         FIXME("get realmode interupt vector(0x%02x) unimplemented.\n",
 431               BL_reg(context));
 432         SET_CFLAG(context);
 433         break;
 434     case 0x0201: /* set real mode interrupt vector */
 435         FIXME("set realmode interrupt vector(0x%02x,0x%04x:0x%04x) unimplemented\n", BL_reg(context),CX_reg(context),DX_reg(context));
 436         SET_CFLAG(context);
 437         break;
 438     case 0x0204:  /* Get protected mode interrupt vector */
 439         TRACE("get protected mode interrupt handler (0x%02x), stub!\n",BL_reg(context));
 440         dw = (DWORD)INT_GetPMHandler( BL_reg(context) );
 441         SET_CX( context, HIWORD(dw) );
 442         SET_DX( context, LOWORD(dw) );
 443         break;
 444
 445     case 0x0205:  /* Set protected mode interrupt vector */
 446         TRACE("set protected mode interrupt handler (0x%02x,%p), stub!\n",
 447             BL_reg(context),MapSL(MAKESEGPTR(CX_reg(context),DX_reg(context))));
 448         INT_SetPMHandler( BL_reg(context),
 449                           (FARPROC16)MAKESEGPTR( CX_reg(context), DX_reg(context) ));
 450         break;
 451
 452     case 0x0300:  /* Simulate real mode interrupt */
 453         CallRMInt( context );
 454         break;
 455
 456     case 0x0301:  /* Call real mode procedure with far return */
 457         CallRMProc( context, FALSE );
 458         break;
 459
 460     case 0x0302:  /* Call real mode procedure with interrupt return */
 461         CallRMProc( context, TRUE );
 462         break;
 463
 464     case 0x0303:  /* Allocate Real Mode Callback Address */
 465         AllocRMCB( context );
 466         break;
 467
 468     case 0x0304:  /* Free Real Mode Callback Address */
 469         FreeRMCB( context );
 470         break;
 471
 472     case 0x0305:  /* Get State Save/Restore Addresses */
 473         TRACE("get state save/restore addresses\n");
 474         /* we probably won't need this kind of state saving */
 475         SET_AX( context, 0 );
 476         /* real mode: just point to the lret */
 477         SET_BX( context, DOSMEM_dpmi_segments.wrap_seg );
 478         context->Ecx = 2;
 479         /* protected mode: don't have any handler yet... */
 480         FIXME("no protected-mode dummy state save/restore handler yet\n");
 481         SET_SI( context, 0 );
 482         context->Edi = 0;
 483         break;
 484
 485     case 0x0306:  /* Get Raw Mode Switch Addresses */
 486         TRACE("get raw mode switch addresses\n");
 487         /* real mode, point to standard DPMI return wrapper */
 488         SET_BX( context, DOSMEM_dpmi_segments.wrap_seg );
 489         context->Ecx = 0;
 490         /* protected mode, point to DPMI call wrapper */
 491         SET_SI( context, DOSMEM_dpmi_segments.dpmi_sel );
 492         context->Edi = 8; /* offset of the INT 0x31 call */
 493         break;
 494     case 0x0400:  /* Get DPMI version */
 495         TRACE("get DPMI version\n");
 496         {
 497             SYSTEM_INFO si;
 498
 499             GetSystemInfo(&si);
 500             SET_AX( context, 0x005a );  /* DPMI version 0.90 */
 501             SET_BX( context, 0x0005 );  /* Flags: 32-bit, virtual memory */
 502             SET_CL( context, si.wProcessorLevel );
 503             SET_DX( context, 0x0102 );  /* Master/slave interrupt controller base*/
 504             break;
 505         }
 506     case 0x0500:  /* Get free memory information */
 507         TRACE("get free memory information\n");
 508         {
 509             MEMMANINFO mmi;
 510
 511             mmi.dwSize = sizeof(mmi);
 512             MemManInfo16(&mmi);
 513             ptr = MapSL(MAKESEGPTR(context->SegEs,DI_reg(context)));
 514             /* the layout is just the same as MEMMANINFO, but without
 515              * the dwSize entry.
 516              */
 517             memcpy(ptr,((char*)&mmi)+4,sizeof(mmi)-4);
 518             break;
 519         }
 520     case 0x0501:  /* Allocate memory block */
 521         TRACE("allocate memory block (%ld)\n",MAKELONG(CX_reg(context),BX_reg(context)));
 522         if (!(ptr = (BYTE *)DPMI_xalloc(MAKELONG(CX_reg(context), BX_reg(context)))))
 523         {
 524             SET_AX( context, 0x8012 );  /* linear memory not available */
 525             SET_CFLAG(context);
 526         } else {
 527             SET_BX( context, HIWORD(W32S_WINE2APP(ptr)) );
 528             SET_CX( context, LOWORD(W32S_WINE2APP(ptr)) );
 529             SET_SI( context, HIWORD(W32S_WINE2APP(ptr)) );
 530             SET_DI( context, LOWORD(W32S_WINE2APP(ptr)) );
 531         }
 532         break;
 533
 534     case 0x0502:  /* Free memory block */
 535         TRACE("free memory block (0x%08lx)\n",
 536                      W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context))));
 537         DPMI_xfree( (void *)W32S_APP2WINE(MAKELONG(DI_reg(context), SI_reg(context))) );
 538         break;
 539
 540     case 0x0503:  /* Resize memory block */
 541         TRACE("resize memory block (0x%08lx,%ld)\n",
 542                      W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context))),
 543                      MAKELONG(CX_reg(context),BX_reg(context)));
 544         if (!(ptr = (BYTE *)DPMI_xrealloc(
 545                 (void *)W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context))),
 546                 MAKELONG(CX_reg(context),BX_reg(context)))))
 547         {
 548             SET_AX( context, 0x8012 );  /* linear memory not available */
 549             SET_CFLAG(context);
 550         } else {
 551             SET_BX( context, HIWORD(W32S_WINE2APP(ptr)) );
 552             SET_CX( context, LOWORD(W32S_WINE2APP(ptr)) );
 553             SET_SI( context, HIWORD(W32S_WINE2APP(ptr)) );
 554             SET_DI( context, LOWORD(W32S_WINE2APP(ptr)) );
 555         }
 556         break;
 557
 558     case 0x0507:  /* Modify page attributes */
 559         FIXME("modify page attributes unimplemented\n");
 560         break;  /* Just ignore it */
 561
 562     case 0x0600:  /* Lock linear region */
 563         FIXME("lock linear region unimplemented\n");
 564         break;  /* Just ignore it */
 565
 566     case 0x0601:  /* Unlock linear region */
 567         FIXME("unlock linear region unimplemented\n");
 568         break;  /* Just ignore it */
 569
 570     case 0x0602:  /* Unlock real-mode region */
 571         FIXME("unlock realmode region unimplemented\n");
 572         break;  /* Just ignore it */
 573
 574     case 0x0603:  /* Lock real-mode region */
 575         FIXME("lock realmode region unimplemented\n");
 576         break;  /* Just ignore it */
 577
 578     case 0x0604:  /* Get page size */
 579         TRACE("get pagesize\n");
 580         SET_BX( context, 0 );
 581         SET_CX( context, getpagesize() );
 582         break;
 583
 584     case 0x0702:  /* Mark page as demand-paging candidate */
 585         FIXME("mark page as demand-paging candidate\n");
 586         break;  /* Just ignore it */
 587
 588     case 0x0703:  /* Discard page contents */
 589         FIXME("discard page contents\n");
 590         break;  /* Just ignore it */
 591
 592      case 0x0800:  /* Physical address mapping */
 593         FIXME("map real to linear (0x%08lx)\n",MAKELONG(CX_reg(context),BX_reg(context)));
 594          if(!(ptr=DOSMEM_MapRealToLinear(MAKELONG(CX_reg(context),BX_reg(context)))))
 595          {
 596              SET_AX( context, 0x8021 );
 597              SET_CFLAG(context);
 598          }
 599          else
 600          {
 601              SET_BX( context, HIWORD(W32S_WINE2APP(ptr)) );
 602              SET_CX( context, LOWORD(W32S_WINE2APP(ptr)) );
 603              RESET_CFLAG(context);
 604          }
 605          break;
 606
 607     default:
 608         INT_BARF( context, 0x31 );
 609         SET_AX( context, 0x8001 );  /* unsupported function */
 610         SET_CFLAG(context);
 611         break;
 612     }
 613
 614 }