msdos/dpmi.c

   1 /*
   2  * DPMI 0.9 emulation
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  */
   6
   7 #include <unistd.h>
   8 #include <string.h>
   9 #include "windef.h"
  10 #include "wine/winbase16.h"
  11 #include "ldt.h"
  12 #include "global.h"
  13 #include "module.h"
  14 #include "miscemu.h"
  15 #include "msdos.h"
  16 #include "task.h"
  17 #include "thread.h"     /* for !MZ_SUPPORTED */
  18 #include "stackframe.h" /* for !MZ_SUPPORTED */
  19 #include "toolhelp.h"
  20 #include "selectors.h"
  21 #include "process.h"
  22 #include "callback.h"
  23 #include "debugtools.h"
  24
  25 DEFAULT_DEBUG_CHANNEL(int31)
  26
  27 #define DOS_GET_DRIVE(reg) ((reg) ? (reg) - 1 : DRIVE_GetCurrentDrive())
  28
  29 void CreateBPB(int drive, BYTE *data, BOOL16 limited);  /* defined in int21.c */
  30
  31 static void* lastvalloced = NULL;
  32
  33 /* Structure for real-mode callbacks */
  34 typedef struct
  35 {
  36     DWORD edi;
  37     DWORD esi;
  38     DWORD ebp;
  39     DWORD reserved;
  40     DWORD ebx;
  41     DWORD edx;
  42     DWORD ecx;
  43     DWORD eax;
  44     WORD  fl;
  45     WORD  es;
  46     WORD  ds;
  47     WORD  fs;
  48     WORD  gs;
  49     WORD  ip;
  50     WORD  cs;
  51     WORD  sp;
  52     WORD  ss;
  53 } REALMODECALL;
  54
  55
  56
  57 typedef struct tagRMCB {
  58     DWORD address;
  59     DWORD proc_ofs,proc_sel;
  60     DWORD regs_ofs,regs_sel;
  61     struct tagRMCB *next;
  62 } RMCB;
  63
  64 static RMCB *FirstRMCB = NULL;
  65
  66 UINT16 DPMI_wrap_seg;
  67
  68 /**********************************************************************
  69  *          DPMI_xalloc
  70  * special virtualalloc, allocates lineary monoton growing memory.
  71  * (the usual VirtualAlloc does not satisfy that restriction)
  72  */
  73 static LPVOID
  74 DPMI_xalloc(int len) {
  75         LPVOID  ret;
  76         LPVOID  oldlastv = lastvalloced;
  77
  78         if (lastvalloced) {
  79                 int     xflag = 0;
  80                 ret = NULL;
  81                 while (!ret) {
  82                         ret=VirtualAlloc(lastvalloced,len,MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
  83                         if (!ret)
  84                                 lastvalloced = (char *) lastvalloced + 0x10000;
  85                         /* we failed to allocate one in the first round.
  86                          * try non-linear
  87                          */
  88                         if (!xflag && (lastvalloced<oldlastv)) { /* wrapped */
  89                                 FIXME("failed to allocate lineary growing memory (%d bytes), using non-linear growing...\n",len);
  90                                 xflag++;
  91                         }
  92                         /* if we even fail to allocate something in the next
  93                          * round, return NULL
  94                          */
  95                         if ((xflag==1) && (lastvalloced >= oldlastv))
  96                                 xflag++;
  97                         if ((xflag==2) && (lastvalloced < oldlastv)) {
  98                                 FIXME("failed to allocate any memory of %d bytes!\n",len);
  99                                 return NULL;
 100                         }
 101                 }
 102         } else
 103                  ret=VirtualAlloc(NULL,len,MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
 104         lastvalloced = (LPVOID)(((DWORD)ret+len+0xffff)&~0xffff);
 105         return ret;
 106 }
 107
 108 static void
 109 DPMI_xfree(LPVOID ptr) {
 110         VirtualFree(ptr,0,MEM_RELEASE);
 111 }
 112
 113 /* FIXME: perhaps we could grow this mapped area... */
 114 static LPVOID
 115 DPMI_xrealloc(LPVOID ptr,int newsize) {
 116         MEMORY_BASIC_INFORMATION        mbi;
 117         LPVOID                          newptr;
 118
 119         newptr = DPMI_xalloc(newsize);
 120         if (ptr) {
 121                 if (!VirtualQuery(ptr,&mbi,sizeof(mbi))) {
 122                         FIXME("realloc of DPMI_xallocd region %p?\n",ptr);
 123                         return NULL;
 124                 }
 125                 if (mbi.State == MEM_FREE) {
 126                         FIXME("realloc of DPMI_xallocd region %p?\n",ptr);
 127                         return NULL;
 128                 }
 129                 /* We do not shrink allocated memory. most reallocs
 130                  * only do grows anyway
 131                  */
 132                 if (newsize<=mbi.RegionSize)
 133                         return ptr;
 134                 memcpy(newptr,ptr,mbi.RegionSize);
 135                 DPMI_xfree(ptr);
 136         }
 137         return newptr;
 138 }
 139 /**********************************************************************
 140  *          INT_GetRealModeContext
 141  */
 142 static void INT_GetRealModeContext( REALMODECALL *call, CONTEXT86 *context )
 143 {
 144     EAX_reg(context) = call->eax;
 145     EBX_reg(context) = call->ebx;
 146     ECX_reg(context) = call->ecx;
 147     EDX_reg(context) = call->edx;
 148     ESI_reg(context) = call->esi;
 149     EDI_reg(context) = call->edi;
 150     EBP_reg(context) = call->ebp;
 151     EFL_reg(context) = call->fl | V86_FLAG;
 152     EIP_reg(context) = call->ip;
 153     ESP_reg(context) = call->sp;
 154     CS_reg(context)  = call->cs;
 155     DS_reg(context)  = call->ds;
 156     ES_reg(context)  = call->es;
 157     FS_reg(context)  = call->fs;
 158     GS_reg(context)  = call->gs;
 159     SS_reg(context)  = call->ss;
 160     V86BASE(context) = (DWORD) DOSMEM_MemoryBase(0);
 161 }
 162
 163
 164 /**********************************************************************
 165  *          INT_SetRealModeContext
 166  */
 167 static void INT_SetRealModeContext( REALMODECALL *call, CONTEXT86 *context )
 168 {
 169     call->eax = EAX_reg(context);
 170     call->ebx = EBX_reg(context);
 171     call->ecx = ECX_reg(context);
 172     call->edx = EDX_reg(context);
 173     call->esi = ESI_reg(context);
 174     call->edi = EDI_reg(context);
 175     call->ebp = EBP_reg(context);
 176     call->fl  = LOWORD(EFL_reg(context));
 177     call->ip  = LOWORD(EIP_reg(context));
 178     call->sp  = LOWORD(ESP_reg(context));
 179     call->cs  = CS_reg(context);
 180     call->ds  = DS_reg(context);
 181     call->es  = ES_reg(context);
 182     call->fs  = FS_reg(context);
 183     call->gs  = GS_reg(context);
 184     call->ss  = SS_reg(context);
 185 }
 186
 187
 188 /**********************************************************************
 189  *          DPMI_CallRMCBProc
 190  *
 191  * This routine does the hard work of calling a callback procedure.
 192  */
 193 static void DPMI_CallRMCBProc( CONTEXT86 *context, RMCB *rmcb, WORD flag )
 194 {
 195     if (IS_SELECTOR_SYSTEM( rmcb->proc_sel )) {
 196         /* Wine-internal RMCB, call directly */
 197         ((RMCBPROC)rmcb->proc_ofs)(context);
 198     } else {
 199 #ifdef __i386__
 200         UINT16 ss,es;
 201         DWORD edi;
 202
 203         INT_SetRealModeContext((REALMODECALL *)PTR_SEG_OFF_TO_LIN( rmcb->regs_sel, rmcb->regs_ofs ), context);
 204         ss = SELECTOR_AllocBlock( DOSMEM_MemoryBase(0) + (DWORD)(SS_reg(context)<<4), 0x10000, SEGMENT_DATA, FALSE, FALSE );
 205
 206         FIXME("untested!\n");
 207
 208         /* The called proc ends with an IRET, and takes these parameters:
 209          * DS:ESI = pointer to real-mode SS:SP
 210          * ES:EDI = pointer to real-mode call structure
 211          * It returns:
 212          * ES:EDI = pointer to real-mode call structure (may be a copy)
 213          * It is the proc's responsibility to change the return CS:IP in the
 214          * real-mode call structure. */
 215         if (flag & 1) {
 216             int _clobber;
 217             /* 32-bit DPMI client */
 218             __asm__ __volatile__(
 219                  "pushl %%es\n"
 220                  "pushl %%ds\n"
 221                  "pushfl\n"
 222                  "movl %5,%%es\n"
 223                  "movl %4,%%ds\n"
 224                  "lcall %3\n"
 225                  "popl %%ds\n"
 226                  "movl %%es,%0\n"
 227                  "popl %%es\n"
 228              : "=g" (es), "=D" (edi), "=S" (_clobber)
 229              : "m" (rmcb->proc_ofs),
 230                "g" (ss), "g" (rmcb->regs_sel),
 231                "S" (ESP_reg(context)), "1" (rmcb->regs_ofs)
 232              : "ecx", "edx", "ebp" );
 233         } else {
 234             /* 16-bit DPMI client */
 235             CONTEXT86 ctx = *context;
 236             CS_reg(&ctx) = rmcb->proc_sel;
 237             EIP_reg(&ctx) = rmcb->proc_ofs;
 238             DS_reg(&ctx) = ss;
 239             ESI_reg(&ctx) = ESP_reg(context);
 240             ES_reg(&ctx) = rmcb->regs_sel;
 241             EDI_reg(&ctx) = rmcb->regs_ofs;
 242             Callbacks->CallRegisterShortProc(&ctx, 2);
 243             es = ES_reg(&ctx);
 244             edi = EDI_reg(&ctx);
 245         }
 246         SELECTOR_FreeBlock(ss, 1);
 247         INT_GetRealModeContext((REALMODECALL*)PTR_SEG_OFF_TO_LIN( es, edi ), context);
 248 #else
 249         ERR("RMCBs only implemented for i386\n");
 250 #endif
 251     }
 252 }
 253
 254
 255 /**********************************************************************
 256  *          DPMI_CallRMProc
 257  *
 258  * This routine does the hard work of calling a real mode procedure.
 259  */
 260 int DPMI_CallRMProc( CONTEXT86 *context, LPWORD stack, int args, int iret )
 261 {
 262     LPWORD stack16;
 263 #ifndef MZ_SUPPORTED
 264     WORD sel;
 265     SEGPTR seg_addr;
 266 #endif /* !MZ_SUPPORTED */
 267     LPVOID addr = NULL; /* avoid gcc warning */
 268     TDB *pTask = (TDB *)GlobalLock16( GetCurrentTask() );
 269     NE_MODULE *pModule = pTask ? NE_GetPtr( pTask->hModule ) : NULL;
 270     RMCB *CurrRMCB;
 271     int alloc = 0, already = 0;
 272     BYTE *code;
 273
 274     GlobalUnlock16( GetCurrentTask() );
 275
 276     TRACE("EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
 277                  EAX_reg(context), EBX_reg(context), ECX_reg(context), EDX_reg(context) );
 278     TRACE("ESI=%08lx EDI=%08lx ES=%04lx DS=%04lx CS:IP=%04lx:%04x, %d WORD arguments, %s\n",
 279                  ESI_reg(context), EDI_reg(context), ES_reg(context), DS_reg(context),
 280                  CS_reg(context), LOWORD(EIP_reg(context)), args, iret?"IRET":"FAR" );
 281
 282 callrmproc_again:
 283
 284 /* there might be some code that just jumps to RMCBs or the like,
 285    in which case following the jumps here might get us to a shortcut */
 286     code = CTX_SEG_OFF_TO_LIN(context, CS_reg(context), EIP_reg(context));
 287     switch (*code) {
 288     case 0xe9: /* JMP NEAR */
 289       EIP_reg(context) += 3 + *(WORD *)(code+1);
 290       /* yeah, I know these gotos don't look good... */
 291       goto callrmproc_again;
 292     case 0xea: /* JMP FAR */
 293       EIP_reg(context) = *(WORD *)(code+1);
 294       CS_reg(context) = *(WORD *)(code+3);
 295       /* ...but since the label is there anyway... */
 296       goto callrmproc_again;
 297     case 0xeb: /* JMP SHORT */
 298       EIP_reg(context) += 2 + *(signed char *)(code+1);
 299       /* ...because of other gotos below, so... */
 300       goto callrmproc_again;
 301     }
 302
 303 /* shortcut for chaining to internal interrupt handlers */
 304     if ((CS_reg(context) == 0xF000) && iret) {
 305         return INT_RealModeInterrupt( LOWORD(EIP_reg(context))/4, context);
 306     }
 307
 308 /* shortcut for RMCBs */
 309     CurrRMCB = FirstRMCB;
 310
 311     while (CurrRMCB && (HIWORD(CurrRMCB->address) != CS_reg(context)))
 312         CurrRMCB = CurrRMCB->next;
 313
 314 #ifdef MZ_SUPPORTED
 315     if (!(CurrRMCB || pModule->lpDosTask)) {
 316         FIXME("DPMI real-mode call using DOS VM task system, not fully tested!\n");
 317         TRACE("creating VM86 task\n");
 318         if (!MZ_InitTask( MZ_AllocDPMITask( pModule->self ) )) {
 319             ERR("could not setup VM86 task\n");
 320             return 1;
 321         }
 322     }
 323 #endif
 324     if (!already) {
 325 #ifdef MZ_SUPPORTED
 326         if (!SS_reg(context)) {
 327             alloc = 1; /* allocate default stack */
 328             stack16 = addr = DOSMEM_GetBlock( pModule->self, 64, (UINT16 *)&(SS_reg(context)) );
 329             ESP_reg(context) = 64-2;
 330             stack16 += 32-1;
 331             if (!addr) {
 332                 ERR("could not allocate default stack\n");
 333                 return 1;
 334             }
 335         } else {
 336             stack16 = CTX_SEG_OFF_TO_LIN(context, SS_reg(context), ESP_reg(context));
 337         }
 338         ESP_reg(context) -= (args + (iret?1:0)) * sizeof(WORD);
 339 #else
 340         stack16 = (LPWORD) CURRENT_STACK16;
 341 #endif
 342         stack16 -= args;
 343         if (args) memcpy(stack16, stack, args*sizeof(WORD) );
 344         /* push flags if iret */
 345         if (iret) {
 346             stack16--; args++;
 347             *stack16 = LOWORD(EFL_reg(context));
 348         }
 349 #ifdef MZ_SUPPORTED
 350         /* push return address (return to interrupt wrapper) */
 351         *(--stack16) = DPMI_wrap_seg;
 352         *(--stack16) = 0;
 353         /* adjust stack */
 354         ESP_reg(context) -= 2*sizeof(WORD);
 355 #endif
 356         already = 1;
 357     }
 358
 359     if (CurrRMCB) {
 360         /* RMCB call, invoke protected-mode handler directly */
 361         DPMI_CallRMCBProc(context, CurrRMCB, pModule->lpDosTask?pModule->lpDosTask->dpmi_flag:0);
 362         /* check if we returned to where we thought we would */
 363         if ((CS_reg(context) != DPMI_wrap_seg) ||
 364             (LOWORD(EIP_reg(context)) != 0)) {
 365             /* we need to continue at different address in real-mode space,
 366                so we need to set it all up for real mode again */
 367             goto callrmproc_again;
 368         }
 369     } else {
 370 #ifdef MZ_SUPPORTED
 371 #if 0 /* this was probably unnecessary */
 372         /* push call address */
 373         *(--stack16) = CS_reg(context);
 374         *(--stack16) = LOWORD(EIP_reg(context));
 375         /* adjust stack */
 376         ESP_reg(context) -= 2*sizeof(WORD);
 377         /* set initial CS:IP to the wrapper's "lret" */
 378         CS_reg(context) = DPMI_wrap_seg;
 379         EIP_reg(context) = 2;
 380 #endif
 381         TRACE("entering real mode...\n");
 382         DOSVM_Enter( context );
 383         TRACE("returned from real-mode call\n");
 384 #else
 385         addr = CTX_SEG_OFF_TO_LIN(context, CS_reg(context), EIP_reg(context));
 386         sel = SELECTOR_AllocBlock( addr, 0x10000, SEGMENT_CODE, FALSE, FALSE );
 387         seg_addr = PTR_SEG_OFF_TO_SEGPTR( sel, 0 );
 388
 389         CS_reg(context) = HIWORD(seg_addr);
 390         EIP_reg(context) = LOWORD(seg_addr);
 391         EBP_reg(context) = OFFSETOF( NtCurrentTeb()->cur_stack )
 392                                    + (WORD)&((STACK16FRAME*)0)->bp;
 393         Callbacks->CallRegisterShortProc(context, args*sizeof(WORD));
 394         SELECTOR_FreeBlock(sel, 1);
 395 #endif
 396     }
 397     if (alloc) DOSMEM_FreeBlock( pModule->self, addr );
 398     return 0;
 399 }
 400
 401
 402 /**********************************************************************
 403  *          CallRMInt
 404  */
 405 static void CallRMInt( CONTEXT86 *context )
 406 {
 407     CONTEXT86 realmode_ctx;
 408     FARPROC16 rm_int = INT_GetRMHandler( BL_reg(context) );
 409     REALMODECALL *call = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(context),
 410                                                           DI_reg(context) );
 411     INT_GetRealModeContext( call, &realmode_ctx );
 412
 413     /* we need to check if a real-mode program has hooked the interrupt */
 414     if (HIWORD(rm_int)!=0xF000) {
 415         /* yup, which means we need to switch to real mode... */
 416         CS_reg(&realmode_ctx) = HIWORD(rm_int);
 417         EIP_reg(&realmode_ctx) = LOWORD(rm_int);
 418         if (DPMI_CallRMProc( &realmode_ctx, NULL, 0, TRUE))
 419           SET_CFLAG(context);
 420     } else {
 421         RESET_CFLAG(context);
 422         /* use the IP we have instead of BL_reg, in case some apps
 423            decide to move interrupts around for whatever reason... */
 424         if (INT_RealModeInterrupt( LOWORD(rm_int)/4, &realmode_ctx ))
 425           SET_CFLAG(context);
 426         if (EFL_reg(context)&1) {
 427           FIXME("%02x: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
 428                 BL_reg(context), EAX_reg(&realmode_ctx), EBX_reg(&realmode_ctx),
 429                 ECX_reg(&realmode_ctx), EDX_reg(&realmode_ctx));
 430           FIXME("      ESI=%08lx EDI=%08lx DS=%04lx ES=%04lx\n",
 431                 ESI_reg(&realmode_ctx), EDI_reg(&realmode_ctx),
 432                 DS_reg(&realmode_ctx), ES_reg(&realmode_ctx) );
 433         }
 434     }
 435     INT_SetRealModeContext( call, &realmode_ctx );
 436 }
 437
 438
 439 static void CallRMProc( CONTEXT86 *context, int iret )
 440 {
 441     REALMODECALL *p = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(context), DI_reg(context) );
 442     CONTEXT86 context16;
 443
 444     TRACE("RealModeCall: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
 445         p->eax, p->ebx, p->ecx, p->edx);
 446     TRACE("              ESI=%08lx EDI=%08lx ES=%04x DS=%04x CS:IP=%04x:%04x, %d WORD arguments, %s\n",
 447         p->esi, p->edi, p->es, p->ds, p->cs, p->ip, CX_reg(context), iret?"IRET":"FAR" );
 448
 449     if (!(p->cs) && !(p->ip)) { /* remove this check
 450                                    if Int21/6501 case map function
 451                                    has been implemented */
 452         SET_CFLAG(context);
 453         return;
 454     }
 455     INT_GetRealModeContext(p, &context16);
 456     DPMI_CallRMProc( &context16, ((LPWORD)PTR_SEG_OFF_TO_LIN(SS_reg(context), LOWORD(ESP_reg(context))))+3,
 457                      CX_reg(context), iret );
 458     INT_SetRealModeContext(p, &context16);
 459 }
 460
 461
 462 static void WINAPI WINE_UNUSED RMCallbackProc( RMCB *rmcb )
 463 {
 464     /* This routine should call DPMI_CallRMCBProc, but we don't have the
 465        register structure available - this is easily fixed by going through
 466        a Win16 register relay instead of calling RMCallbackProc "directly",
 467        but I won't bother at this time. */
 468     FIXME("not properly supported on your architecture!\n");
 469 }
 470
 471 static RMCB *DPMI_AllocRMCB( void )
 472 {
 473     RMCB *NewRMCB = HeapAlloc(GetProcessHeap(), 0, sizeof(RMCB));
 474     UINT16 uParagraph;
 475
 476     if (NewRMCB)
 477     {
 478 #ifdef MZ_SUPPORTED
 479         LPVOID RMCBmem = DOSMEM_GetBlock(0, 4, &uParagraph);
 480         LPBYTE p = RMCBmem;
 481
 482         *p++ = 0xcd; /* RMCB: */
 483         *p++ = 0x31; /* int $0x31 */
 484 /* it is the called procedure's task to change the return CS:EIP
 485    the DPMI 0.9 spec states that if it doesn't, it will be called again */
 486         *p++ = 0xeb;
 487         *p++ = 0xfc; /* jmp RMCB */
 488 #else
 489         LPVOID RMCBmem = DOSMEM_GetBlock(0, 15, &uParagraph);
 490         LPBYTE p = RMCBmem;
 491
 492         *p++ = 0x68; /* pushl */
 493         *(LPVOID *)p = NewRMCB;
 494         p+=4;
 495         *p++ = 0x9a; /* lcall */
 496         *(FARPROC16 *)p = (FARPROC16)RMCallbackProc; /* FIXME: register relay */
 497         p+=4;
 498         GET_CS(*(WORD *)p);
 499         p+=2;
 500         *p++=0xc3; /* lret (FIXME?) */
 501 #endif
 502         NewRMCB->address = MAKELONG(0, uParagraph);
 503         NewRMCB->next = FirstRMCB;
 504         FirstRMCB = NewRMCB;
 505     }
 506     return NewRMCB;
 507 }
 508
 509
 510 static void AllocRMCB( CONTEXT86 *context )
 511 {
 512     RMCB *NewRMCB = DPMI_AllocRMCB();
 513
 514     TRACE("Function to call: %04x:%04x\n", (WORD)DS_reg(context), SI_reg(context) );
 515
 516     if (NewRMCB)
 517     {
 518         /* FIXME: if 32-bit DPMI client, use ESI and EDI */
 519         NewRMCB->proc_ofs = SI_reg(context);
 520         NewRMCB->proc_sel = DS_reg(context);
 521         NewRMCB->regs_ofs = DI_reg(context);
 522         NewRMCB->regs_sel = ES_reg(context);
 523         SET_LOWORD( ECX_reg(context), HIWORD(NewRMCB->address) );
 524         SET_LOWORD( EDX_reg(context), LOWORD(NewRMCB->address) );
 525     }
 526     else
 527     {
 528         SET_LOWORD( EAX_reg(context), 0x8015 ); /* callback unavailable */
 529         SET_CFLAG(context);
 530     }
 531 }
 532
 533
 534 FARPROC16 WINAPI DPMI_AllocInternalRMCB( RMCBPROC proc )
 535 {
 536     RMCB *NewRMCB = DPMI_AllocRMCB();
 537
 538     if (NewRMCB) {
 539         NewRMCB->proc_ofs = (DWORD)proc;
 540         NewRMCB->proc_sel = 0;
 541         NewRMCB->regs_ofs = 0;
 542         NewRMCB->regs_sel = 0;
 543         return (FARPROC16)(NewRMCB->address);
 544     }
 545     return NULL;
 546 }
 547
 548
 549 static int DPMI_FreeRMCB( DWORD address )
 550 {
 551     RMCB *CurrRMCB = FirstRMCB;
 552     RMCB *PrevRMCB = NULL;
 553
 554     while (CurrRMCB && (CurrRMCB->address != address))
 555     {
 556         PrevRMCB = CurrRMCB;
 557         CurrRMCB = CurrRMCB->next;
 558     }
 559     if (CurrRMCB)
 560     {
 561         if (PrevRMCB)
 562         PrevRMCB->next = CurrRMCB->next;
 563             else
 564         FirstRMCB = CurrRMCB->next;
 565         DOSMEM_FreeBlock(0, DOSMEM_MapRealToLinear(CurrRMCB->address));
 566         HeapFree(GetProcessHeap(), 0, CurrRMCB);
 567         return 0;
 568     }
 569     return 1;
 570 }
 571
 572
 573 static void FreeRMCB( CONTEXT86 *context )
 574 {
 575     FIXME("callback address: %04x:%04x\n",
 576           CX_reg(context), DX_reg(context));
 577
 578     if (DPMI_FreeRMCB(MAKELONG(DX_reg(context), CX_reg(context)))) {
 579         SET_LOWORD( EAX_reg(context), 0x8024 ); /* invalid callback address */
 580         SET_CFLAG(context);
 581     }
 582 }
 583
 584
 585 void WINAPI DPMI_FreeInternalRMCB( FARPROC16 proc )
 586 {
 587     DPMI_FreeRMCB( (DWORD)proc );
 588 }
 589
 590
 591 #ifdef MZ_SUPPORTED
 592 /* (see loader/dos/module.c, function MZ_InitDPMI) */
 593
 594 static void StartPM( CONTEXT86 *context, LPDOSTASK lpDosTask )
 595 {
 596     char *base = DOSMEM_MemoryBase(0);
 597     UINT16 cs, ss, ds, es;
 598     CONTEXT86 pm_ctx;
 599     DWORD psp_ofs = (DWORD)(lpDosTask->psp_seg<<4);
 600     PDB16 *psp = (PDB16 *)(base + psp_ofs);
 601     HANDLE16 env_seg = psp->environment;
 602     int is32;
 603
 604     RESET_CFLAG(context);
 605     lpDosTask->dpmi_flag = AX_reg(context);
 606     is32 = lpDosTask->dpmi_flag & 1;
 607 /* our mode switch wrapper have placed the desired CS into DX */
 608     cs = SELECTOR_AllocBlock( base + (DWORD)(DX_reg(context)<<4), 0x10000, SEGMENT_CODE, FALSE, FALSE );
 609 /* due to a flaw in some CPUs (at least mine), it is best to mark stack segments as 32-bit if they
 610    can be used in 32-bit code. Otherwise, these CPUs may not set the high word of esp during a
 611    ring transition (from kernel code) to the 16-bit stack, and this causes trouble if executing
 612    32-bit code using this stack. */
 613     ss = SELECTOR_AllocBlock( base + (DWORD)(SS_reg(context)<<4), 0x10000, SEGMENT_DATA, is32, FALSE );
 614 /* do the same for the data segments, just in case */
 615     if (DS_reg(context) == SS_reg(context)) ds = ss;
 616     else ds = SELECTOR_AllocBlock( base + (DWORD)(DS_reg(context)<<4), 0x10000, SEGMENT_DATA, is32, FALSE );
 617     es = SELECTOR_AllocBlock( base + psp_ofs, 0x100, SEGMENT_DATA, is32, FALSE );
 618 /* convert environment pointer, as the spec says, but we're a bit lazy about the size here... */
 619     psp->environment = SELECTOR_AllocBlock( base + (DWORD)(env_seg<<4),
 620                                             0x10000, SEGMENT_DATA, FALSE, FALSE );
 621
 622     pm_ctx = *context;
 623     CS_reg(&pm_ctx) = lpDosTask->dpmi_sel;
 624 /* our mode switch wrapper expects the new CS in DX, and the new SS in AX */
 625     EAX_reg(&pm_ctx) = ss;
 626     EDX_reg(&pm_ctx) = cs;
 627     DS_reg(&pm_ctx) = ds;
 628     ES_reg(&pm_ctx) = es;
 629     FS_reg(&pm_ctx) = 0;
 630     GS_reg(&pm_ctx) = 0;
 631
 632     TRACE("DOS program is now entering protected mode\n");
 633     Callbacks->CallRegisterShortProc(&pm_ctx, 0);
 634
 635     /* in the current state of affairs, we won't ever actually return here... */
 636     /* we should have int21/ah=4c do it someday, though... */
 637
 638     SELECTOR_FreeBlock(psp->environment, 1);
 639     psp->environment = env_seg;
 640     SELECTOR_FreeBlock(es, 1);
 641     if (ds != ss) SELECTOR_FreeBlock(ds, 1);
 642     SELECTOR_FreeBlock(ss, 1);
 643     SELECTOR_FreeBlock(cs, 1);
 644 }
 645
 646 /* DPMI Raw Mode Switch handler */
 647
 648 #if 0
 649 void WINAPI DPMI_RawModeSwitch( SIGCONTEXT *context )
 650 {
 651   LPDOSTASK lpDosTask = MZ_Current();
 652   CONTEXT86 rm_ctx;
 653   int ret;
 654
 655   if (!lpDosTask) {
 656     /* we could probably start a DPMI-only dosmod task here, but I doubt
 657        anything other than real DOS apps want to call raw mode switch */
 658     ERR("attempting raw mode switch without DOS task!\n");
 659     ExitProcess(1);
 660   }
 661   /* initialize real-mode context as per spec */
 662   memset(&rm_ctx, 0, sizeof(rm_ctx));
 663   DS_reg(&rm_ctx) = AX_sig(context);
 664   ES_reg(&rm_ctx) = CX_sig(context);
 665   SS_reg(&rm_ctx) = DX_sig(context);
 666   ESP_reg(&rm_ctx) = EBX_sig(context);
 667   CS_reg(&rm_ctx) = SI_sig(context);
 668   EIP_reg(&rm_ctx) = EDI_sig(context);
 669   EBP_reg(&rm_ctx) = EBP_sig(context);
 670   FS_reg(&rm_ctx) = 0;
 671   GS_reg(&rm_ctx) = 0;
 672   EFL_reg(&rm_ctx) = EFL_sig(context); /* at least we need the IF flag */
 673
 674   /* enter real mode again */
 675   TRACE("re-entering real mode at %04lx:%04lx\n",
 676         CS_reg(&rm_ctx),EIP_reg(&rm_ctx));
 677   ret = DOSVM_Enter( &rm_ctx );
 678   /* when the real-mode stuff call its mode switch address,
 679      DOSVM_Enter will return and we will continue here */
 680
 681   if (ret<0) {
 682     /* if the sync was lost, there's no way to recover */
 683     ExitProcess(1);
 684   }
 685
 686   /* alter protected-mode context as per spec */
 687   DS_sig(context) = AX_reg(&rm_ctx);
 688   ES_sig(context) = CX_reg(&rm_ctx);
 689   SS_sig(context) = DX_reg(&rm_ctx);
 690   ESP_sig(context) = EBX_reg(&rm_ctx);
 691   CS_sig(context) = SI_reg(&rm_ctx);
 692   EIP_sig(context) = EDI_reg(&rm_ctx);
 693   EBP_sig(context) = EBP_reg(&rm_ctx);
 694   FS_sig(context) = 0;
 695   GS_sig(context) = 0;
 696
 697   /* Return to new address and hope that we didn't mess up */
 698   TRACE("re-entering protected mode at %04x:%08lx\n",
 699         CS_sig(context), EIP_sig(context));
 700 }
 701 #endif
 702
 703 #else
 704 #if 0
 705 void WINAPI DPMI_RawModeSwitch( SIGCONTEXT *context )
 706 {
 707   ERR("don't even think about DPMI raw mode switch without DOS support!\n");
 708   ExitProcess(1);
 709 }
 710 #endif
 711 #endif
 712
 713 #define DOS_APP_ISDOS(addr,base) ((addr) < 0x110000)
 714 #define DOS_WINE_ISDOS(addr,base) (((addr) >= (base)) && ((addr) < (base) + 0x110000))
 715 #define DOS_UC_APPTOWINE(addr,base) ((addr) + (base))
 716 #define DOS_UC_WINETOAPP(addr,base) ((addr) - (base))
 717 #define DOS_APPTOWINE(addr,base) (DOS_APP_ISDOS(addr,base) ? DOS_UC_APPTOWINE(addr,base) : (addr))
 718 #define DOS_WINETOAPP(addr,base) (DOS_WINE_ISDOS(addr,base) ? DOS_UC_WINETOAPP(addr,base) : (addr))
 719 #define DOS_BADLIMIT(addr,base,limit) \
 720   ((limit == 0xffffffff) || /* disallow "fat DS" for now */ \
 721    (DOS_WINE_ISDOS(addr,base) && \
 722     ((addr) + (limit) > (base) + 0x110000)))
 723
 724 /**********************************************************************
 725  *          INT_Int31Handler
 726  *
 727  * Handler for int 31h (DPMI).
 728  */
 729
 730 void WINAPI INT_Int31Handler( CONTEXT86 *context )
 731 {
 732     /*
 733      * Note: For Win32s processes, the whole linear address space is
 734      *       shifted by 0x10000 relative to the OS linear address space.
 735      *       See the comment in msdos/vxd.c.
 736      */
 737     DWORD offset = W32S_APPLICATION() ? W32S_OFFSET : 0;
 738
 739     DWORD dw;
 740     BYTE *ptr;
 741
 742     LPDOSTASK lpDosTask = MZ_Current();
 743
 744 #ifdef MZ_SUPPORTED
 745     if (ISV86(context) && lpDosTask) {
 746         /* Called from real mode, check if it's our wrapper */
 747         TRACE("called from real mode\n");
 748         if (CS_reg(context)==lpDosTask->dpmi_seg) {
 749             /* This is the protected mode switch */
 750             StartPM(context,lpDosTask);
 751             return;
 752         } else
 753         if (CS_reg(context)==lpDosTask->xms_seg) {
 754             /* This is the XMS driver entry point */
 755             XMS_Handler(context);
 756             return;
 757         } else
 758         {
 759             /* Check for RMCB */
 760             RMCB *CurrRMCB = FirstRMCB;
 761
 762             while (CurrRMCB && (HIWORD(CurrRMCB->address) != CS_reg(context)))
 763                 CurrRMCB = CurrRMCB->next;
 764
 765             if (CurrRMCB) {
 766                 /* RMCB call, propagate to protected-mode handler */
 767                 DPMI_CallRMCBProc(context, CurrRMCB, lpDosTask->dpmi_flag);
 768                 return;
 769             }
 770         }
 771     }
 772 #endif
 773
 774     RESET_CFLAG(context);
 775     switch(AX_reg(context))
 776     {
 777     case 0x0000:  /* Allocate LDT descriptors */
 778         TRACE("allocate LDT descriptors (%d)\n",CX_reg(context));
 779         if (!(EAX_reg(context) = AllocSelectorArray16( CX_reg(context) )))
 780         {
 781             TRACE("failed\n");
 782             EAX_reg(context) = 0x8011;  /* descriptor unavailable */
 783             SET_CFLAG(context);
 784         }
 785         TRACE("success, array starts at 0x%04x\n",AX_reg(context));
 786         break;
 787
 788     case 0x0001:  /* Free LDT descriptor */
 789         TRACE("free LDT descriptor (0x%04x)\n",BX_reg(context));
 790         if (FreeSelector16( BX_reg(context) ))
 791         {
 792             EAX_reg(context) = 0x8022;  /* invalid selector */
 793             SET_CFLAG(context);
 794         }
 795         else
 796         {
 797             /* If a segment register contains the selector being freed, */
 798             /* set it to zero. */
 799             if (!((DS_reg(context)^BX_reg(context)) & ~3)) DS_reg(context) = 0;
 800             if (!((ES_reg(context)^BX_reg(context)) & ~3)) ES_reg(context) = 0;
 801             if (!((FS_reg(context)^BX_reg(context)) & ~3)) FS_reg(context) = 0;
 802             if (!((GS_reg(context)^BX_reg(context)) & ~3)) GS_reg(context) = 0;
 803         }
 804         break;
 805
 806     case 0x0002:  /* Real mode segment to descriptor */
 807         TRACE("real mode segment to descriptor (0x%04x)\n",BX_reg(context));
 808         {
 809             WORD entryPoint = 0;  /* KERNEL entry point for descriptor */
 810             switch(BX_reg(context))
 811             {
 812             case 0x0000: entryPoint = 183; break;  /* __0000H */
 813             case 0x0040: entryPoint = 193; break;  /* __0040H */
 814             case 0xa000: entryPoint = 174; break;  /* __A000H */
 815             case 0xb000: entryPoint = 181; break;  /* __B000H */
 816             case 0xb800: entryPoint = 182; break;  /* __B800H */
 817             case 0xc000: entryPoint = 195; break;  /* __C000H */
 818             case 0xd000: entryPoint = 179; break;  /* __D000H */
 819             case 0xe000: entryPoint = 190; break;  /* __E000H */
 820             case 0xf000: entryPoint = 194; break;  /* __F000H */
 821             default:
 822                 EAX_reg(context) = DOSMEM_AllocSelector(BX_reg(context));
 823                 break;
 824             }
 825             if (entryPoint)
 826                 EAX_reg(context) = LOWORD(NE_GetEntryPoint( GetModuleHandle16( "KERNEL" ),
 827                                                             entryPoint ));
 828         }
 829         break;
 830
 831     case 0x0003:  /* Get next selector increment */
 832         TRACE("get selector increment (__AHINCR)\n");
 833         EAX_reg(context) = __AHINCR;
 834         break;
 835
 836     case 0x0004:  /* Lock selector (not supported) */
 837         FIXME("lock selector not supported\n");
 838         EAX_reg(context) = 0;  /* FIXME: is this a correct return value? */
 839         break;
 840
 841     case 0x0005:  /* Unlock selector (not supported) */
 842         FIXME("unlock selector not supported\n");
 843         EAX_reg(context) = 0;  /* FIXME: is this a correct return value? */
 844         break;
 845
 846     case 0x0006:  /* Get selector base address */
 847         TRACE("get selector base address (0x%04x)\n",BX_reg(context));
 848         if (!(dw = GetSelectorBase( BX_reg(context) )))
 849         {
 850             EAX_reg(context) = 0x8022;  /* invalid selector */
 851             SET_CFLAG(context);
 852         }
 853         else
 854         {
 855 #ifdef MZ_SUPPORTED
 856             if (lpDosTask) {
 857                 DWORD base = (DWORD)DOSMEM_MemoryBase(lpDosTask->hModule);
 858                 dw = DOS_WINETOAPP(dw, base);
 859             }
 860 #endif
 861             CX_reg(context) = HIWORD(W32S_WINE2APP(dw, offset));
 862             DX_reg(context) = LOWORD(W32S_WINE2APP(dw, offset));
 863         }
 864         break;
 865
 866     case 0x0007:  /* Set selector base address */
 867         TRACE("set selector base address (0x%04x,0x%08lx)\n",
 868                      BX_reg(context),
 869                      W32S_APP2WINE(MAKELONG(DX_reg(context),CX_reg(context)), offset));
 870         dw = W32S_APP2WINE(MAKELONG(DX_reg(context), CX_reg(context)), offset);
 871 #ifdef MZ_SUPPORTED
 872         if (lpDosTask) {
 873             DWORD base = (DWORD)DOSMEM_MemoryBase(lpDosTask->hModule);
 874             dw = DOS_APPTOWINE(dw, base);
 875         }
 876 #endif
 877         SetSelectorBase(BX_reg(context), dw);
 878         break;
 879
 880     case 0x0008:  /* Set selector limit */
 881         TRACE("set selector limit (0x%04x,0x%08lx)\n",BX_reg(context),MAKELONG(DX_reg(context),CX_reg(context)));
 882         dw = MAKELONG( DX_reg(context), CX_reg(context) );
 883 #ifdef MZ_SUPPORTED
 884         if (lpDosTask) {
 885             DWORD base = (DWORD)DOSMEM_MemoryBase(lpDosTask->hModule);
 886             DWORD sbase = GetSelectorBase( BX_reg(context) );
 887             if (!sbase) {
 888                 /* the app has set the limit without setting the base,
 889                  * it must be relying on that the default should be DOS space;
 890                  * so set the base address now */
 891                 SetSelectorBase( BX_reg(context), sbase = base );
 892                 if (dw == 0xffffffff) {
 893                     /* djgpp does this without checking (in _dos_ds setup, crt1.c),
 894                      * so we have to override the limit here */
 895                     dw = 0x110000;
 896                 }
 897             }
 898             if (DOS_BADLIMIT(sbase, base, dw)) {
 899                 AX_reg(context) = 0x8021;  /* invalid value */
 900                 SET_CFLAG(context);
 901                 break;
 902             }
 903         }
 904 #endif
 905         SetSelectorLimit16( BX_reg(context), dw );
 906         break;
 907
 908     case 0x0009:  /* Set selector access rights */
 909         TRACE("set selector access rights(0x%04x,0x%04x)\n",BX_reg(context),CX_reg(context));
 910         SelectorAccessRights16( BX_reg(context), 1, CX_reg(context) );
 911         break;
 912
 913     case 0x000a:  /* Allocate selector alias */
 914         TRACE("allocate selector alias (0x%04x)\n",BX_reg(context));
 915         if (!(AX_reg(context) = AllocCStoDSAlias16( BX_reg(context) )))
 916         {
 917             AX_reg(context) = 0x8011;  /* descriptor unavailable */
 918             SET_CFLAG(context);
 919         }
 920         break;
 921
 922     case 0x000b:  /* Get descriptor */
 923         TRACE("get descriptor (0x%04x)\n",BX_reg(context));
 924         {
 925             ldt_entry entry;
 926             LDT_GetEntry( SELECTOR_TO_ENTRY( BX_reg(context) ), &entry );
 927 #ifdef MZ_SUPPORTED
 928             if (lpDosTask) {
 929                 DWORD base = (DWORD)DOSMEM_MemoryBase(lpDosTask->hModule);
 930                 entry.base = DOS_WINETOAPP(entry.base, base);
 931             }
 932 #endif
 933             entry.base = W32S_WINE2APP(entry.base, offset);
 934
 935             /* FIXME: should use ES:EDI for 32-bit clients */
 936             LDT_EntryToBytes( PTR_SEG_OFF_TO_LIN( ES_reg(context),
 937                                                   DI_reg(context) ), &entry );
 938         }
 939         break;
 940
 941     case 0x000c:  /* Set descriptor */
 942         TRACE("set descriptor (0x%04x)\n",BX_reg(context));
 943         {
 944             ldt_entry entry;
 945             LDT_BytesToEntry( PTR_SEG_OFF_TO_LIN( ES_reg(context),
 946                                                   DI_reg(context) ), &entry );
 947             entry.base = W32S_APP2WINE(entry.base, offset);
 948 #ifdef MZ_SUPPORTED
 949             if (lpDosTask) {
 950                 DWORD base = (DWORD)DOSMEM_MemoryBase(lpDosTask->hModule);
 951                 entry.base = DOS_APPTOWINE(entry.base, base);
 952                 if (DOS_BADLIMIT(entry.base, base, entry.limit)) {
 953                     AX_reg(context) = 0x8021;  /* invalid value */
 954                     SET_CFLAG(context);
 955                     break;
 956                 }
 957             }
 958 #endif
 959
 960             LDT_SetEntry( SELECTOR_TO_ENTRY( BX_reg(context) ), &entry );
 961         }
 962         break;
 963
 964     case 0x000d:  /* Allocate specific LDT descriptor */
 965         FIXME("allocate descriptor (0x%04x), stub!\n",BX_reg(context));
 966         AX_reg(context) = 0x8011; /* descriptor unavailable */
 967         SET_CFLAG(context);
 968         break;
 969     case 0x0100:  /* Allocate DOS memory block */
 970         TRACE("allocate DOS memory block (0x%x paragraphs)\n",BX_reg(context));
 971         dw = GlobalDOSAlloc16((DWORD)BX_reg(context)<<4);
 972         if (dw) {
 973             AX_reg(context) = HIWORD(dw);
 974             DX_reg(context) = LOWORD(dw);
 975         } else {
 976             AX_reg(context) = 0x0008; /* insufficient memory */
 977             BX_reg(context) = DOSMEM_Available(0)>>4;
 978             SET_CFLAG(context);
 979         }
 980         break;
 981     case 0x0101:  /* Free DOS memory block */
 982         TRACE("free DOS memory block (0x%04x)\n",DX_reg(context));
 983         dw = GlobalDOSFree16(DX_reg(context));
 984         if (!dw) {
 985             AX_reg(context) = 0x0009; /* memory block address invalid */
 986             SET_CFLAG(context);
 987         }
 988         break;
 989     case 0x0200: /* get real mode interrupt vector */
 990         FIXME("get realmode interupt vector(0x%02x) unimplemented.\n",
 991               BL_reg(context));
 992         SET_CFLAG(context);
 993         break;
 994     case 0x0201: /* set real mode interrupt vector */
 995         FIXME("set realmode interupt vector(0x%02x,0x%04x:0x%04x) unimplemented\n", BL_reg(context),CX_reg(context),DX_reg(context));
 996         SET_CFLAG(context);
 997         break;
 998     case 0x0204:  /* Get protected mode interrupt vector */
 999         TRACE("get protected mode interrupt handler (0x%02x), stub!\n",BL_reg(context));
1000         dw = (DWORD)INT_GetPMHandler( BL_reg(context) );
1001         CX_reg(context) = HIWORD(dw);
1002         DX_reg(context) = LOWORD(dw);
1003         break;
1004
1005     case 0x0205:  /* Set protected mode interrupt vector */
1006         TRACE("set protected mode interrupt handler (0x%02x,%p), stub!\n",
1007             BL_reg(context),PTR_SEG_OFF_TO_LIN(CX_reg(context),DX_reg(context)));
1008         INT_SetPMHandler( BL_reg(context),
1009                           (FARPROC16)PTR_SEG_OFF_TO_SEGPTR( CX_reg(context),
1010                                                             DX_reg(context) ));
1011         break;
1012
1013     case 0x0300:  /* Simulate real mode interrupt */
1014         CallRMInt( context );
1015         break;
1016
1017     case 0x0301:  /* Call real mode procedure with far return */
1018         CallRMProc( context, FALSE );
1019         break;
1020
1021     case 0x0302:  /* Call real mode procedure with interrupt return */
1022         CallRMProc( context, TRUE );
1023         break;
1024
1025     case 0x0303:  /* Allocate Real Mode Callback Address */
1026         AllocRMCB( context );
1027         break;
1028
1029     case 0x0304:  /* Free Real Mode Callback Address */
1030         FreeRMCB( context );
1031         break;
1032
1033     case 0x0305:  /* Get State Save/Restore Addresses */
1034         TRACE("get state save/restore addresses\n");
1035         /* we probably won't need this kind of state saving */
1036         AX_reg(context) = 0;
1037         /* real mode: just point to the lret */
1038         BX_reg(context) = DPMI_wrap_seg;
1039         ECX_reg(context) = 2;
1040         /* protected mode: don't have any handler yet... */
1041         FIXME("no protected-mode dummy state save/restore handler yet\n");
1042         SI_reg(context) = 0;
1043         EDI_reg(context) = 0;
1044         break;
1045
1046     case 0x0306:  /* Get Raw Mode Switch Addresses */
1047         TRACE("get raw mode switch addresses\n");
1048         if (lpDosTask) {
1049           /* real mode, point to standard DPMI return wrapper */
1050           BX_reg(context) = DPMI_wrap_seg;
1051           ECX_reg(context) = 0;
1052           /* protected mode, point to DPMI call wrapper */
1053           SI_reg(context) = lpDosTask->dpmi_sel;
1054           EDI_reg(context) = 8; /* offset of the INT 0x31 call */
1055         } else {
1056           ERR("win app attempting to get raw mode switch!\n");
1057           AX_reg(context) = 0x8001; /* unsupported function */
1058           SET_CFLAG(context);
1059         }
1060         break;
1061     case 0x0400:  /* Get DPMI version */
1062         TRACE("get DPMI version\n");
1063         {
1064             SYSTEM_INFO si;
1065
1066             GetSystemInfo(&si);
1067             AX_reg(context) = 0x005a;  /* DPMI version 0.90 */
1068             BX_reg(context) = 0x0005;  /* Flags: 32-bit, virtual memory */
1069             CL_reg(context) = si.wProcessorLevel;
1070             DX_reg(context) = 0x0102;  /* Master/slave interrupt controller base*/
1071             break;
1072         }
1073     case 0x0500:  /* Get free memory information */
1074         TRACE("get free memory information\n");
1075         {
1076             MEMMANINFO mmi;
1077
1078             mmi.dwSize = sizeof(mmi);
1079             MemManInfo16(&mmi);
1080             ptr = (BYTE *)PTR_SEG_OFF_TO_LIN(ES_reg(context),DI_reg(context));
1081             /* the layout is just the same as MEMMANINFO, but without
1082              * the dwSize entry.
1083              */
1084             memcpy(ptr,((char*)&mmi)+4,sizeof(mmi)-4);
1085             break;
1086         }
1087     case 0x0501:  /* Allocate memory block */
1088         TRACE("allocate memory block (%ld)\n",MAKELONG(CX_reg(context),BX_reg(context)));
1089         if (!(ptr = (BYTE *)DPMI_xalloc(MAKELONG(CX_reg(context), BX_reg(context)))))
1090         {
1091             AX_reg(context) = 0x8012;  /* linear memory not available */
1092             SET_CFLAG(context);
1093         } else {
1094             BX_reg(context) = SI_reg(context) = HIWORD(W32S_WINE2APP(ptr, offset));
1095             CX_reg(context) = DI_reg(context) = LOWORD(W32S_WINE2APP(ptr, offset));
1096         }
1097         break;
1098
1099     case 0x0502:  /* Free memory block */
1100         TRACE("free memory block (0x%08lx)\n",
1101                      W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context)), offset));
1102         DPMI_xfree( (void *)W32S_APP2WINE(MAKELONG(DI_reg(context),
1103                                                SI_reg(context)), offset) );
1104         break;
1105
1106     case 0x0503:  /* Resize memory block */
1107         TRACE("resize memory block (0x%08lx,%ld)\n",
1108                      W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context)), offset),
1109                      MAKELONG(CX_reg(context),BX_reg(context)));
1110         if (!(ptr = (BYTE *)DPMI_xrealloc(
1111                 (void *)W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context)), offset),
1112                 MAKELONG(CX_reg(context),BX_reg(context)))))
1113         {
1114             AX_reg(context) = 0x8012;  /* linear memory not available */
1115             SET_CFLAG(context);
1116         } else {
1117             BX_reg(context) = SI_reg(context) = HIWORD(W32S_WINE2APP(ptr, offset));
1118             CX_reg(context) = DI_reg(context) = LOWORD(W32S_WINE2APP(ptr, offset));
1119         }
1120         break;
1121
1122     case 0x0507:  /* Modify page attributes */
1123         FIXME("modify page attributes unimplemented\n");
1124         break;  /* Just ignore it */
1125
1126     case 0x0600:  /* Lock linear region */
1127         FIXME("lock linear region unimplemented\n");
1128         break;  /* Just ignore it */
1129
1130     case 0x0601:  /* Unlock linear region */
1131         FIXME("unlock linear region unimplemented\n");
1132         break;  /* Just ignore it */
1133
1134     case 0x0602:  /* Unlock real-mode region */
1135         FIXME("unlock realmode region unimplemented\n");
1136         break;  /* Just ignore it */
1137
1138     case 0x0603:  /* Lock real-mode region */
1139         FIXME("lock realmode region unimplemented\n");
1140         break;  /* Just ignore it */
1141
1142     case 0x0604:  /* Get page size */
1143         TRACE("get pagesize\n");
1144         BX_reg(context) = 0;
1145         CX_reg(context) = VIRTUAL_GetPageSize();
1146         break;
1147
1148     case 0x0702:  /* Mark page as demand-paging candidate */
1149         FIXME("mark page as demand-paging candidate\n");
1150         break;  /* Just ignore it */
1151
1152     case 0x0703:  /* Discard page contents */
1153         FIXME("discard page contents\n");
1154         break;  /* Just ignore it */
1155
1156      case 0x0800:  /* Physical address mapping */
1157         FIXME("map real to linear (0x%08lx)\n",MAKELONG(CX_reg(context),BX_reg(context)));
1158          if(!(ptr=DOSMEM_MapRealToLinear(MAKELONG(CX_reg(context),BX_reg(context)))))
1159          {
1160              AX_reg(context) = 0x8021;
1161              SET_CFLAG(context);
1162          }
1163          else
1164          {
1165              BX_reg(context) = HIWORD(W32S_WINE2APP(ptr, offset));
1166              CX_reg(context) = LOWORD(W32S_WINE2APP(ptr, offset));
1167              RESET_CFLAG(context);
1168          }
1169          break;
1170
1171     default:
1172         INT_BARF( context, 0x31 );
1173         AX_reg(context) = 0x8001;  /* unsupported function */
1174         SET_CFLAG(context);
1175         break;
1176     }
1177
1178 }