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             /* 32-bit DPMI client */
 217 #if HAVE_FIXED_BROKEN_ASSEMBLER_BELOW
 218             int _clobber;
 219             __asm__ __volatile__(
 220                  "pushl %%es\n"
 221                  "pushl %%ds\n"
 222                  "pushfl\n"
 223                  "movl %5,%%es\n"       /* BAD: we are pushing potential stack
 224                                          * parameters on an already modified
 225                                          * stack
 226                                          */
 227                  "movl %4,%%ds\n"
 228                  "lcall %3\n"
 229                  "popl %%ds\n"
 230                  "movl %%es,%0\n"
 231                  "popl %%es\n"
 232              : "=g" (es), "=D" (edi), "=S" (_clobber)
 233              : "m" (rmcb->proc_ofs),
 234                "g" (ss), "g" (rmcb->regs_sel),
 235                "S" (ESP_reg(context)), "1" (rmcb->regs_ofs)
 236              : "ecx", "edx", "ebp" );
 237             /* BAD: uses too much registers which is starving the register
 238              * alloc stage of gcc, especially in -fPIC.
 239              */
 240 #else
 241             FIXME("32 bit DPMI client unsupported.\n");
 242 #endif
 243         } else {
 244             /* 16-bit DPMI client */
 245             CONTEXT86 ctx = *context;
 246             CS_reg(&ctx) = rmcb->proc_sel;
 247             EIP_reg(&ctx) = rmcb->proc_ofs;
 248             DS_reg(&ctx) = ss;
 249             ESI_reg(&ctx) = ESP_reg(context);
 250             ES_reg(&ctx) = rmcb->regs_sel;
 251             EDI_reg(&ctx) = rmcb->regs_ofs;
 252             Callbacks->CallRegisterShortProc(&ctx, 2);
 253             es = ES_reg(&ctx);
 254             edi = EDI_reg(&ctx);
 255         }
 256         SELECTOR_FreeBlock(ss, 1);
 257         INT_GetRealModeContext((REALMODECALL*)PTR_SEG_OFF_TO_LIN( es, edi ), context);
 258 #else
 259         ERR("RMCBs only implemented for i386\n");
 260 #endif
 261     }
 262 }
 263
 264
 265 /**********************************************************************
 266  *          DPMI_CallRMProc
 267  *
 268  * This routine does the hard work of calling a real mode procedure.
 269  */
 270 int DPMI_CallRMProc( CONTEXT86 *context, LPWORD stack, int args, int iret )
 271 {
 272     LPWORD stack16;
 273 #ifndef MZ_SUPPORTED
 274     WORD sel;
 275     SEGPTR seg_addr;
 276 #endif /* !MZ_SUPPORTED */
 277     LPVOID addr = NULL; /* avoid gcc warning */
 278     TDB *pTask = (TDB *)GlobalLock16( GetCurrentTask() );
 279     NE_MODULE *pModule = pTask ? NE_GetPtr( pTask->hModule ) : NULL;
 280     RMCB *CurrRMCB;
 281     int alloc = 0, already = 0;
 282     BYTE *code;
 283
 284     GlobalUnlock16( GetCurrentTask() );
 285
 286     TRACE("EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
 287                  EAX_reg(context), EBX_reg(context), ECX_reg(context), EDX_reg(context) );
 288     TRACE("ESI=%08lx EDI=%08lx ES=%04lx DS=%04lx CS:IP=%04lx:%04x, %d WORD arguments, %s\n",
 289                  ESI_reg(context), EDI_reg(context), ES_reg(context), DS_reg(context),
 290                  CS_reg(context), LOWORD(EIP_reg(context)), args, iret?"IRET":"FAR" );
 291
 292 callrmproc_again:
 293
 294 /* there might be some code that just jumps to RMCBs or the like,
 295    in which case following the jumps here might get us to a shortcut */
 296     code = CTX_SEG_OFF_TO_LIN(context, CS_reg(context), EIP_reg(context));
 297     switch (*code) {
 298     case 0xe9: /* JMP NEAR */
 299       EIP_reg(context) += 3 + *(WORD *)(code+1);
 300       /* yeah, I know these gotos don't look good... */
 301       goto callrmproc_again;
 302     case 0xea: /* JMP FAR */
 303       EIP_reg(context) = *(WORD *)(code+1);
 304       CS_reg(context) = *(WORD *)(code+3);
 305       /* ...but since the label is there anyway... */
 306       goto callrmproc_again;
 307     case 0xeb: /* JMP SHORT */
 308       EIP_reg(context) += 2 + *(signed char *)(code+1);
 309       /* ...because of other gotos below, so... */
 310       goto callrmproc_again;
 311     }
 312
 313 /* shortcut for chaining to internal interrupt handlers */
 314     if ((CS_reg(context) == 0xF000) && iret) {
 315         return INT_RealModeInterrupt( LOWORD(EIP_reg(context))/4, context);
 316     }
 317
 318 /* shortcut for RMCBs */
 319     CurrRMCB = FirstRMCB;
 320
 321     while (CurrRMCB && (HIWORD(CurrRMCB->address) != CS_reg(context)))
 322         CurrRMCB = CurrRMCB->next;
 323
 324 #ifdef MZ_SUPPORTED
 325     if (!(CurrRMCB || pModule->lpDosTask)) {
 326         FIXME("DPMI real-mode call using DOS VM task system, not fully tested!\n");
 327         TRACE("creating VM86 task\n");
 328         if (!MZ_InitTask( MZ_AllocDPMITask( pModule->self ) )) {
 329             ERR("could not setup VM86 task\n");
 330             return 1;
 331         }
 332     }
 333 #endif
 334     if (!already) {
 335 #ifdef MZ_SUPPORTED
 336         if (!SS_reg(context)) {
 337             alloc = 1; /* allocate default stack */
 338             stack16 = addr = DOSMEM_GetBlock( pModule->self, 64, (UINT16 *)&(SS_reg(context)) );
 339             ESP_reg(context) = 64-2;
 340             stack16 += 32-1;
 341             if (!addr) {
 342                 ERR("could not allocate default stack\n");
 343                 return 1;
 344             }
 345         } else {
 346             stack16 = CTX_SEG_OFF_TO_LIN(context, SS_reg(context), ESP_reg(context));
 347         }
 348         ESP_reg(context) -= (args + (iret?1:0)) * sizeof(WORD);
 349 #else
 350         stack16 = (LPWORD) CURRENT_STACK16;
 351 #endif
 352         stack16 -= args;
 353         if (args) memcpy(stack16, stack, args*sizeof(WORD) );
 354         /* push flags if iret */
 355         if (iret) {
 356             stack16--; args++;
 357             *stack16 = LOWORD(EFL_reg(context));
 358         }
 359 #ifdef MZ_SUPPORTED
 360         /* push return address (return to interrupt wrapper) */
 361         *(--stack16) = DPMI_wrap_seg;
 362         *(--stack16) = 0;
 363         /* adjust stack */
 364         ESP_reg(context) -= 2*sizeof(WORD);
 365 #endif
 366         already = 1;
 367     }
 368
 369     if (CurrRMCB) {
 370         /* RMCB call, invoke protected-mode handler directly */
 371         DPMI_CallRMCBProc(context, CurrRMCB, pModule->lpDosTask?pModule->lpDosTask->dpmi_flag:0);
 372         /* check if we returned to where we thought we would */
 373         if ((CS_reg(context) != DPMI_wrap_seg) ||
 374             (LOWORD(EIP_reg(context)) != 0)) {
 375             /* we need to continue at different address in real-mode space,
 376                so we need to set it all up for real mode again */
 377             goto callrmproc_again;
 378         }
 379     } else {
 380 #ifdef MZ_SUPPORTED
 381 #if 0 /* this was probably unnecessary */
 382         /* push call address */
 383         *(--stack16) = CS_reg(context);
 384         *(--stack16) = LOWORD(EIP_reg(context));
 385         /* adjust stack */
 386         ESP_reg(context) -= 2*sizeof(WORD);
 387         /* set initial CS:IP to the wrapper's "lret" */
 388         CS_reg(context) = DPMI_wrap_seg;
 389         EIP_reg(context) = 2;
 390 #endif
 391         TRACE("entering real mode...\n");
 392         DOSVM_Enter( context );
 393         TRACE("returned from real-mode call\n");
 394 #else
 395         addr = CTX_SEG_OFF_TO_LIN(context, CS_reg(context), EIP_reg(context));
 396         sel = SELECTOR_AllocBlock( addr, 0x10000, SEGMENT_CODE, FALSE, FALSE );
 397         seg_addr = PTR_SEG_OFF_TO_SEGPTR( sel, 0 );
 398
 399         CS_reg(context) = HIWORD(seg_addr);
 400         EIP_reg(context) = LOWORD(seg_addr);
 401         EBP_reg(context) = OFFSETOF( NtCurrentTeb()->cur_stack )
 402                                    + (WORD)&((STACK16FRAME*)0)->bp;
 403         Callbacks->CallRegisterShortProc(context, args*sizeof(WORD));
 404         SELECTOR_FreeBlock(sel, 1);
 405 #endif
 406     }
 407     if (alloc) DOSMEM_FreeBlock( pModule->self, addr );
 408     return 0;
 409 }
 410
 411
 412 /**********************************************************************
 413  *          CallRMInt
 414  */
 415 static void CallRMInt( CONTEXT86 *context )
 416 {
 417     CONTEXT86 realmode_ctx;
 418     FARPROC16 rm_int = INT_GetRMHandler( BL_reg(context) );
 419     REALMODECALL *call = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(context),
 420                                                           DI_reg(context) );
 421     INT_GetRealModeContext( call, &realmode_ctx );
 422
 423     /* we need to check if a real-mode program has hooked the interrupt */
 424     if (HIWORD(rm_int)!=0xF000) {
 425         /* yup, which means we need to switch to real mode... */
 426         CS_reg(&realmode_ctx) = HIWORD(rm_int);
 427         EIP_reg(&realmode_ctx) = LOWORD(rm_int);
 428         if (DPMI_CallRMProc( &realmode_ctx, NULL, 0, TRUE))
 429           SET_CFLAG(context);
 430     } else {
 431         RESET_CFLAG(context);
 432         /* use the IP we have instead of BL_reg, in case some apps
 433            decide to move interrupts around for whatever reason... */
 434         if (INT_RealModeInterrupt( LOWORD(rm_int)/4, &realmode_ctx ))
 435           SET_CFLAG(context);
 436         if (EFL_reg(context)&1) {
 437           FIXME("%02x: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
 438                 BL_reg(context), EAX_reg(&realmode_ctx), EBX_reg(&realmode_ctx),
 439                 ECX_reg(&realmode_ctx), EDX_reg(&realmode_ctx));
 440           FIXME("      ESI=%08lx EDI=%08lx DS=%04lx ES=%04lx\n",
 441                 ESI_reg(&realmode_ctx), EDI_reg(&realmode_ctx),
 442                 DS_reg(&realmode_ctx), ES_reg(&realmode_ctx) );
 443         }
 444     }
 445     INT_SetRealModeContext( call, &realmode_ctx );
 446 }
 447
 448
 449 static void CallRMProc( CONTEXT86 *context, int iret )
 450 {
 451     REALMODECALL *p = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(context), DI_reg(context) );
 452     CONTEXT86 context16;
 453
 454     TRACE("RealModeCall: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
 455         p->eax, p->ebx, p->ecx, p->edx);
 456     TRACE("              ESI=%08lx EDI=%08lx ES=%04x DS=%04x CS:IP=%04x:%04x, %d WORD arguments, %s\n",
 457         p->esi, p->edi, p->es, p->ds, p->cs, p->ip, CX_reg(context), iret?"IRET":"FAR" );
 458
 459     if (!(p->cs) && !(p->ip)) { /* remove this check
 460                                    if Int21/6501 case map function
 461                                    has been implemented */
 462         SET_CFLAG(context);
 463         return;
 464     }
 465     INT_GetRealModeContext(p, &context16);
 466     DPMI_CallRMProc( &context16, ((LPWORD)PTR_SEG_OFF_TO_LIN(SS_reg(context), LOWORD(ESP_reg(context))))+3,
 467                      CX_reg(context), iret );
 468     INT_SetRealModeContext(p, &context16);
 469 }
 470
 471
 472 static void WINAPI WINE_UNUSED RMCallbackProc( RMCB *rmcb )
 473 {
 474     /* This routine should call DPMI_CallRMCBProc, but we don't have the
 475        register structure available - this is easily fixed by going through
 476        a Win16 register relay instead of calling RMCallbackProc "directly",
 477        but I won't bother at this time. */
 478     FIXME("not properly supported on your architecture!\n");
 479 }
 480
 481 static RMCB *DPMI_AllocRMCB( void )
 482 {
 483     RMCB *NewRMCB = HeapAlloc(GetProcessHeap(), 0, sizeof(RMCB));
 484     UINT16 uParagraph;
 485
 486     if (NewRMCB)
 487     {
 488 #ifdef MZ_SUPPORTED
 489         LPVOID RMCBmem = DOSMEM_GetBlock(0, 4, &uParagraph);
 490         LPBYTE p = RMCBmem;
 491
 492         *p++ = 0xcd; /* RMCB: */
 493         *p++ = 0x31; /* int $0x31 */
 494 /* it is the called procedure's task to change the return CS:EIP
 495    the DPMI 0.9 spec states that if it doesn't, it will be called again */
 496         *p++ = 0xeb;
 497         *p++ = 0xfc; /* jmp RMCB */
 498 #elif defined(__i386__)
 499         LPVOID RMCBmem = DOSMEM_GetBlock(0, 15, &uParagraph);
 500         LPBYTE p = RMCBmem;
 501
 502         *p++ = 0x68; /* pushl */
 503         *(LPVOID *)p = NewRMCB;
 504         p+=4;
 505         *p++ = 0x9a; /* lcall */
 506         *(FARPROC16 *)p = (FARPROC16)RMCallbackProc; /* FIXME: register relay */
 507         p+=4;
 508         *(WORD *)p = __get_cs();
 509         p+=2;
 510         *p++=0xc3; /* lret (FIXME?) */
 511 #else
 512         uParagraph = 0;
 513 #endif
 514         NewRMCB->address = MAKELONG(0, uParagraph);
 515         NewRMCB->next = FirstRMCB;
 516         FirstRMCB = NewRMCB;
 517     }
 518     return NewRMCB;
 519 }
 520
 521
 522 static void AllocRMCB( CONTEXT86 *context )
 523 {
 524     RMCB *NewRMCB = DPMI_AllocRMCB();
 525
 526     TRACE("Function to call: %04x:%04x\n", (WORD)DS_reg(context), SI_reg(context) );
 527
 528     if (NewRMCB)
 529     {
 530         /* FIXME: if 32-bit DPMI client, use ESI and EDI */
 531         NewRMCB->proc_ofs = SI_reg(context);
 532         NewRMCB->proc_sel = DS_reg(context);
 533         NewRMCB->regs_ofs = DI_reg(context);
 534         NewRMCB->regs_sel = ES_reg(context);
 535         SET_LOWORD( ECX_reg(context), HIWORD(NewRMCB->address) );
 536         SET_LOWORD( EDX_reg(context), LOWORD(NewRMCB->address) );
 537     }
 538     else
 539     {
 540         SET_LOWORD( EAX_reg(context), 0x8015 ); /* callback unavailable */
 541         SET_CFLAG(context);
 542     }
 543 }
 544
 545
 546 FARPROC16 WINAPI DPMI_AllocInternalRMCB( RMCBPROC proc )
 547 {
 548     RMCB *NewRMCB = DPMI_AllocRMCB();
 549
 550     if (NewRMCB) {
 551         NewRMCB->proc_ofs = (DWORD)proc;
 552         NewRMCB->proc_sel = 0;
 553         NewRMCB->regs_ofs = 0;
 554         NewRMCB->regs_sel = 0;
 555         return (FARPROC16)(NewRMCB->address);
 556     }
 557     return NULL;
 558 }
 559
 560
 561 static int DPMI_FreeRMCB( DWORD address )
 562 {
 563     RMCB *CurrRMCB = FirstRMCB;
 564     RMCB *PrevRMCB = NULL;
 565
 566     while (CurrRMCB && (CurrRMCB->address != address))
 567     {
 568         PrevRMCB = CurrRMCB;
 569         CurrRMCB = CurrRMCB->next;
 570     }
 571     if (CurrRMCB)
 572     {
 573         if (PrevRMCB)
 574         PrevRMCB->next = CurrRMCB->next;
 575             else
 576         FirstRMCB = CurrRMCB->next;
 577         DOSMEM_FreeBlock(0, DOSMEM_MapRealToLinear(CurrRMCB->address));
 578         HeapFree(GetProcessHeap(), 0, CurrRMCB);
 579         return 0;
 580     }
 581     return 1;
 582 }
 583
 584
 585 static void FreeRMCB( CONTEXT86 *context )
 586 {
 587     FIXME("callback address: %04x:%04x\n",
 588           CX_reg(context), DX_reg(context));
 589
 590     if (DPMI_FreeRMCB(MAKELONG(DX_reg(context), CX_reg(context)))) {
 591         SET_LOWORD( EAX_reg(context), 0x8024 ); /* invalid callback address */
 592         SET_CFLAG(context);
 593     }
 594 }
 595
 596
 597 void WINAPI DPMI_FreeInternalRMCB( FARPROC16 proc )
 598 {
 599     DPMI_FreeRMCB( (DWORD)proc );
 600 }
 601
 602
 603 #ifdef MZ_SUPPORTED
 604 /* (see loader/dos/module.c, function MZ_InitDPMI) */
 605
 606 static void StartPM( CONTEXT86 *context, LPDOSTASK lpDosTask )
 607 {
 608     char *base = DOSMEM_MemoryBase(0);
 609     UINT16 cs, ss, ds, es;
 610     CONTEXT86 pm_ctx;
 611     DWORD psp_ofs = (DWORD)(lpDosTask->psp_seg<<4);
 612     PDB16 *psp = (PDB16 *)(base + psp_ofs);
 613     HANDLE16 env_seg = psp->environment;
 614     int is32;
 615
 616     RESET_CFLAG(context);
 617     lpDosTask->dpmi_flag = AX_reg(context);
 618     is32 = lpDosTask->dpmi_flag & 1;
 619 /* our mode switch wrapper have placed the desired CS into DX */
 620     cs = SELECTOR_AllocBlock( base + (DWORD)(DX_reg(context)<<4), 0x10000, SEGMENT_CODE, FALSE, FALSE );
 621 /* due to a flaw in some CPUs (at least mine), it is best to mark stack segments as 32-bit if they
 622    can be used in 32-bit code. Otherwise, these CPUs may not set the high word of esp during a
 623    ring transition (from kernel code) to the 16-bit stack, and this causes trouble if executing
 624    32-bit code using this stack. */
 625     ss = SELECTOR_AllocBlock( base + (DWORD)(SS_reg(context)<<4), 0x10000, SEGMENT_DATA, is32, FALSE );
 626 /* do the same for the data segments, just in case */
 627     if (DS_reg(context) == SS_reg(context)) ds = ss;
 628     else ds = SELECTOR_AllocBlock( base + (DWORD)(DS_reg(context)<<4), 0x10000, SEGMENT_DATA, is32, FALSE );
 629     es = SELECTOR_AllocBlock( base + psp_ofs, 0x100, SEGMENT_DATA, is32, FALSE );
 630 /* convert environment pointer, as the spec says, but we're a bit lazy about the size here... */
 631     psp->environment = SELECTOR_AllocBlock( base + (DWORD)(env_seg<<4),
 632                                             0x10000, SEGMENT_DATA, FALSE, FALSE );
 633
 634     pm_ctx = *context;
 635     CS_reg(&pm_ctx) = lpDosTask->dpmi_sel;
 636 /* our mode switch wrapper expects the new CS in DX, and the new SS in AX */
 637     EAX_reg(&pm_ctx) = ss;
 638     EDX_reg(&pm_ctx) = cs;
 639     DS_reg(&pm_ctx) = ds;
 640     ES_reg(&pm_ctx) = es;
 641     FS_reg(&pm_ctx) = 0;
 642     GS_reg(&pm_ctx) = 0;
 643
 644     TRACE("DOS program is now entering protected mode\n");
 645     Callbacks->CallRegisterShortProc(&pm_ctx, 0);
 646
 647     /* in the current state of affairs, we won't ever actually return here... */
 648     /* we should have int21/ah=4c do it someday, though... */
 649
 650     SELECTOR_FreeBlock(psp->environment, 1);
 651     psp->environment = env_seg;
 652     SELECTOR_FreeBlock(es, 1);
 653     if (ds != ss) SELECTOR_FreeBlock(ds, 1);
 654     SELECTOR_FreeBlock(ss, 1);
 655     SELECTOR_FreeBlock(cs, 1);
 656 }
 657
 658 /* DPMI Raw Mode Switch handler */
 659
 660 #if 0
 661 void WINAPI DPMI_RawModeSwitch( SIGCONTEXT *context )
 662 {
 663   LPDOSTASK lpDosTask = MZ_Current();
 664   CONTEXT86 rm_ctx;
 665   int ret;
 666
 667   if (!lpDosTask) {
 668     /* we could probably start a DPMI-only dosmod task here, but I doubt
 669        anything other than real DOS apps want to call raw mode switch */
 670     ERR("attempting raw mode switch without DOS task!\n");
 671     ExitProcess(1);
 672   }
 673   /* initialize real-mode context as per spec */
 674   memset(&rm_ctx, 0, sizeof(rm_ctx));
 675   DS_reg(&rm_ctx) = AX_sig(context);
 676   ES_reg(&rm_ctx) = CX_sig(context);
 677   SS_reg(&rm_ctx) = DX_sig(context);
 678   ESP_reg(&rm_ctx) = EBX_sig(context);
 679   CS_reg(&rm_ctx) = SI_sig(context);
 680   EIP_reg(&rm_ctx) = EDI_sig(context);
 681   EBP_reg(&rm_ctx) = EBP_sig(context);
 682   FS_reg(&rm_ctx) = 0;
 683   GS_reg(&rm_ctx) = 0;
 684   EFL_reg(&rm_ctx) = EFL_sig(context); /* at least we need the IF flag */
 685
 686   /* enter real mode again */
 687   TRACE("re-entering real mode at %04lx:%04lx\n",
 688         CS_reg(&rm_ctx),EIP_reg(&rm_ctx));
 689   ret = DOSVM_Enter( &rm_ctx );
 690   /* when the real-mode stuff call its mode switch address,
 691      DOSVM_Enter will return and we will continue here */
 692
 693   if (ret<0) {
 694     /* if the sync was lost, there's no way to recover */
 695     ExitProcess(1);
 696   }
 697
 698   /* alter protected-mode context as per spec */
 699   DS_sig(context) = AX_reg(&rm_ctx);
 700   ES_sig(context) = CX_reg(&rm_ctx);
 701   SS_sig(context) = DX_reg(&rm_ctx);
 702   ESP_sig(context) = EBX_reg(&rm_ctx);
 703   CS_sig(context) = SI_reg(&rm_ctx);
 704   EIP_sig(context) = EDI_reg(&rm_ctx);
 705   EBP_sig(context) = EBP_reg(&rm_ctx);
 706   FS_sig(context) = 0;
 707   GS_sig(context) = 0;
 708
 709   /* Return to new address and hope that we didn't mess up */
 710   TRACE("re-entering protected mode at %04x:%08lx\n",
 711         CS_sig(context), EIP_sig(context));
 712 }
 713 #endif
 714
 715 #else
 716 #if 0
 717 void WINAPI DPMI_RawModeSwitch( SIGCONTEXT *context )
 718 {
 719   ERR("don't even think about DPMI raw mode switch without DOS support!\n");
 720   ExitProcess(1);
 721 }
 722 #endif
 723 #endif
 724
 725 #define DOS_APP_ISDOS(addr,base) ((addr) < 0x110000)
 726 #define DOS_WINE_ISDOS(addr,base) (((addr) >= (base)) && ((addr) < (base) + 0x110000))
 727 #define DOS_UC_APPTOWINE(addr,base) ((addr) + (base))
 728 #define DOS_UC_WINETOAPP(addr,base) ((addr) - (base))
 729 #define DOS_APPTOWINE(addr,base) (DOS_APP_ISDOS(addr,base) ? DOS_UC_APPTOWINE(addr,base) : (addr))
 730 #define DOS_WINETOAPP(addr,base) (DOS_WINE_ISDOS(addr,base) ? DOS_UC_WINETOAPP(addr,base) : (addr))
 731 #define DOS_BADLIMIT(addr,base,limit) \
 732   ((limit == 0xffffffff) || /* disallow "fat DS" for now */ \
 733    (DOS_WINE_ISDOS(addr,base) && \
 734     ((addr) + (limit) > (base) + 0x110000)))
 735
 736 /**********************************************************************
 737  *          INT_Int31Handler
 738  *
 739  * Handler for int 31h (DPMI).
 740  */
 741
 742 void WINAPI INT_Int31Handler( CONTEXT86 *context )
 743 {
 744     /*
 745      * Note: For Win32s processes, the whole linear address space is
 746      *       shifted by 0x10000 relative to the OS linear address space.
 747      *       See the comment in msdos/vxd.c.
 748      */
 749     DWORD offset = W32S_APPLICATION() ? W32S_OFFSET : 0;
 750
 751     DWORD dw;
 752     BYTE *ptr;
 753
 754     LPDOSTASK lpDosTask = MZ_Current();
 755
 756 #ifdef MZ_SUPPORTED
 757     if (ISV86(context) && lpDosTask) {
 758         /* Called from real mode, check if it's our wrapper */
 759         TRACE("called from real mode\n");
 760         if (CS_reg(context)==lpDosTask->dpmi_seg) {
 761             /* This is the protected mode switch */
 762             StartPM(context,lpDosTask);
 763             return;
 764         } else
 765         if (CS_reg(context)==lpDosTask->xms_seg) {
 766             /* This is the XMS driver entry point */
 767             XMS_Handler(context);
 768             return;
 769         } else
 770         {
 771             /* Check for RMCB */
 772             RMCB *CurrRMCB = FirstRMCB;
 773
 774             while (CurrRMCB && (HIWORD(CurrRMCB->address) != CS_reg(context)))
 775                 CurrRMCB = CurrRMCB->next;
 776
 777             if (CurrRMCB) {
 778                 /* RMCB call, propagate to protected-mode handler */
 779                 DPMI_CallRMCBProc(context, CurrRMCB, lpDosTask->dpmi_flag);
 780                 return;
 781             }
 782         }
 783     }
 784 #endif
 785
 786     RESET_CFLAG(context);
 787     switch(AX_reg(context))
 788     {
 789     case 0x0000:  /* Allocate LDT descriptors */
 790         TRACE("allocate LDT descriptors (%d)\n",CX_reg(context));
 791         if (!(EAX_reg(context) = AllocSelectorArray16( CX_reg(context) )))
 792         {
 793             TRACE("failed\n");
 794             EAX_reg(context) = 0x8011;  /* descriptor unavailable */
 795             SET_CFLAG(context);
 796         }
 797         TRACE("success, array starts at 0x%04x\n",AX_reg(context));
 798         break;
 799
 800     case 0x0001:  /* Free LDT descriptor */
 801         TRACE("free LDT descriptor (0x%04x)\n",BX_reg(context));
 802         if (FreeSelector16( BX_reg(context) ))
 803         {
 804             EAX_reg(context) = 0x8022;  /* invalid selector */
 805             SET_CFLAG(context);
 806         }
 807         else
 808         {
 809             /* If a segment register contains the selector being freed, */
 810             /* set it to zero. */
 811             if (!((DS_reg(context)^BX_reg(context)) & ~3)) DS_reg(context) = 0;
 812             if (!((ES_reg(context)^BX_reg(context)) & ~3)) ES_reg(context) = 0;
 813             if (!((FS_reg(context)^BX_reg(context)) & ~3)) FS_reg(context) = 0;
 814             if (!((GS_reg(context)^BX_reg(context)) & ~3)) GS_reg(context) = 0;
 815         }
 816         break;
 817
 818     case 0x0002:  /* Real mode segment to descriptor */
 819         TRACE("real mode segment to descriptor (0x%04x)\n",BX_reg(context));
 820         {
 821             WORD entryPoint = 0;  /* KERNEL entry point for descriptor */
 822             switch(BX_reg(context))
 823             {
 824             case 0x0000: entryPoint = 183; break;  /* __0000H */
 825             case 0x0040: entryPoint = 193; break;  /* __0040H */
 826             case 0xa000: entryPoint = 174; break;  /* __A000H */
 827             case 0xb000: entryPoint = 181; break;  /* __B000H */
 828             case 0xb800: entryPoint = 182; break;  /* __B800H */
 829             case 0xc000: entryPoint = 195; break;  /* __C000H */
 830             case 0xd000: entryPoint = 179; break;  /* __D000H */
 831             case 0xe000: entryPoint = 190; break;  /* __E000H */
 832             case 0xf000: entryPoint = 194; break;  /* __F000H */
 833             default:
 834                 EAX_reg(context) = DOSMEM_AllocSelector(BX_reg(context));
 835                 break;
 836             }
 837             if (entryPoint)
 838                 EAX_reg(context) = LOWORD(NE_GetEntryPoint( GetModuleHandle16( "KERNEL" ),
 839                                                             entryPoint ));
 840         }
 841         break;
 842
 843     case 0x0003:  /* Get next selector increment */
 844         TRACE("get selector increment (__AHINCR)\n");
 845         EAX_reg(context) = __AHINCR;
 846         break;
 847
 848     case 0x0004:  /* Lock selector (not supported) */
 849         FIXME("lock selector not supported\n");
 850         EAX_reg(context) = 0;  /* FIXME: is this a correct return value? */
 851         break;
 852
 853     case 0x0005:  /* Unlock selector (not supported) */
 854         FIXME("unlock selector not supported\n");
 855         EAX_reg(context) = 0;  /* FIXME: is this a correct return value? */
 856         break;
 857
 858     case 0x0006:  /* Get selector base address */
 859         TRACE("get selector base address (0x%04x)\n",BX_reg(context));
 860         if (!(dw = GetSelectorBase( BX_reg(context) )))
 861         {
 862             EAX_reg(context) = 0x8022;  /* invalid selector */
 863             SET_CFLAG(context);
 864         }
 865         else
 866         {
 867 #ifdef MZ_SUPPORTED
 868             if (lpDosTask) {
 869                 DWORD base = (DWORD)DOSMEM_MemoryBase(lpDosTask->hModule);
 870                 dw = DOS_WINETOAPP(dw, base);
 871             }
 872 #endif
 873             CX_reg(context) = HIWORD(W32S_WINE2APP(dw, offset));
 874             DX_reg(context) = LOWORD(W32S_WINE2APP(dw, offset));
 875         }
 876         break;
 877
 878     case 0x0007:  /* Set selector base address */
 879         TRACE("set selector base address (0x%04x,0x%08lx)\n",
 880                      BX_reg(context),
 881                      W32S_APP2WINE(MAKELONG(DX_reg(context),CX_reg(context)), offset));
 882         dw = W32S_APP2WINE(MAKELONG(DX_reg(context), CX_reg(context)), offset);
 883 #ifdef MZ_SUPPORTED
 884         if (lpDosTask) {
 885             DWORD base = (DWORD)DOSMEM_MemoryBase(lpDosTask->hModule);
 886             dw = DOS_APPTOWINE(dw, base);
 887         }
 888 #endif
 889         SetSelectorBase(BX_reg(context), dw);
 890         break;
 891
 892     case 0x0008:  /* Set selector limit */
 893         TRACE("set selector limit (0x%04x,0x%08lx)\n",BX_reg(context),MAKELONG(DX_reg(context),CX_reg(context)));
 894         dw = MAKELONG( DX_reg(context), CX_reg(context) );
 895 #ifdef MZ_SUPPORTED
 896         if (lpDosTask) {
 897             DWORD base = (DWORD)DOSMEM_MemoryBase(lpDosTask->hModule);
 898             DWORD sbase = GetSelectorBase( BX_reg(context) );
 899             if (!sbase) {
 900                 /* the app has set the limit without setting the base,
 901                  * it must be relying on that the default should be DOS space;
 902                  * so set the base address now */
 903                 SetSelectorBase( BX_reg(context), sbase = base );
 904                 if (dw == 0xffffffff) {
 905                     /* djgpp does this without checking (in _dos_ds setup, crt1.c),
 906                      * so we have to override the limit here */
 907                     dw = 0x110000;
 908                 }
 909             }
 910             if (DOS_BADLIMIT(sbase, base, dw)) {
 911                 AX_reg(context) = 0x8021;  /* invalid value */
 912                 SET_CFLAG(context);
 913                 break;
 914             }
 915         }
 916 #endif
 917         SetSelectorLimit16( BX_reg(context), dw );
 918         break;
 919
 920     case 0x0009:  /* Set selector access rights */
 921         TRACE("set selector access rights(0x%04x,0x%04x)\n",BX_reg(context),CX_reg(context));
 922         SelectorAccessRights16( BX_reg(context), 1, CX_reg(context) );
 923         break;
 924
 925     case 0x000a:  /* Allocate selector alias */
 926         TRACE("allocate selector alias (0x%04x)\n",BX_reg(context));
 927         if (!(AX_reg(context) = AllocCStoDSAlias16( BX_reg(context) )))
 928         {
 929             AX_reg(context) = 0x8011;  /* descriptor unavailable */
 930             SET_CFLAG(context);
 931         }
 932         break;
 933
 934     case 0x000b:  /* Get descriptor */
 935         TRACE("get descriptor (0x%04x)\n",BX_reg(context));
 936         {
 937             ldt_entry entry;
 938             LDT_GetEntry( SELECTOR_TO_ENTRY( BX_reg(context) ), &entry );
 939 #ifdef MZ_SUPPORTED
 940             if (lpDosTask) {
 941                 DWORD base = (DWORD)DOSMEM_MemoryBase(lpDosTask->hModule);
 942                 entry.base = DOS_WINETOAPP(entry.base, base);
 943             }
 944 #endif
 945             entry.base = W32S_WINE2APP(entry.base, offset);
 946
 947             /* FIXME: should use ES:EDI for 32-bit clients */
 948             LDT_EntryToBytes( PTR_SEG_OFF_TO_LIN( ES_reg(context),
 949                                                   DI_reg(context) ), &entry );
 950         }
 951         break;
 952
 953     case 0x000c:  /* Set descriptor */
 954         TRACE("set descriptor (0x%04x)\n",BX_reg(context));
 955         {
 956             ldt_entry entry;
 957             LDT_BytesToEntry( PTR_SEG_OFF_TO_LIN( ES_reg(context),
 958                                                   DI_reg(context) ), &entry );
 959             entry.base = W32S_APP2WINE(entry.base, offset);
 960 #ifdef MZ_SUPPORTED
 961             if (lpDosTask) {
 962                 DWORD base = (DWORD)DOSMEM_MemoryBase(lpDosTask->hModule);
 963                 entry.base = DOS_APPTOWINE(entry.base, base);
 964                 if (DOS_BADLIMIT(entry.base, base, entry.limit)) {
 965                     AX_reg(context) = 0x8021;  /* invalid value */
 966                     SET_CFLAG(context);
 967                     break;
 968                 }
 969             }
 970 #endif
 971
 972             LDT_SetEntry( SELECTOR_TO_ENTRY( BX_reg(context) ), &entry );
 973         }
 974         break;
 975
 976     case 0x000d:  /* Allocate specific LDT descriptor */
 977         FIXME("allocate descriptor (0x%04x), stub!\n",BX_reg(context));
 978         AX_reg(context) = 0x8011; /* descriptor unavailable */
 979         SET_CFLAG(context);
 980         break;
 981     case 0x0100:  /* Allocate DOS memory block */
 982         TRACE("allocate DOS memory block (0x%x paragraphs)\n",BX_reg(context));
 983         dw = GlobalDOSAlloc16((DWORD)BX_reg(context)<<4);
 984         if (dw) {
 985             AX_reg(context) = HIWORD(dw);
 986             DX_reg(context) = LOWORD(dw);
 987         } else {
 988             AX_reg(context) = 0x0008; /* insufficient memory */
 989             BX_reg(context) = DOSMEM_Available(0)>>4;
 990             SET_CFLAG(context);
 991         }
 992         break;
 993     case 0x0101:  /* Free DOS memory block */
 994         TRACE("free DOS memory block (0x%04x)\n",DX_reg(context));
 995         dw = GlobalDOSFree16(DX_reg(context));
 996         if (!dw) {
 997             AX_reg(context) = 0x0009; /* memory block address invalid */
 998             SET_CFLAG(context);
 999         }
1000         break;
1001     case 0x0200: /* get real mode interrupt vector */
1002         FIXME("get realmode interupt vector(0x%02x) unimplemented.\n",
1003               BL_reg(context));
1004         SET_CFLAG(context);
1005         break;
1006     case 0x0201: /* set real mode interrupt vector */
1007         FIXME("set realmode interupt vector(0x%02x,0x%04x:0x%04x) unimplemented\n", BL_reg(context),CX_reg(context),DX_reg(context));
1008         SET_CFLAG(context);
1009         break;
1010     case 0x0204:  /* Get protected mode interrupt vector */
1011         TRACE("get protected mode interrupt handler (0x%02x), stub!\n",BL_reg(context));
1012         dw = (DWORD)INT_GetPMHandler( BL_reg(context) );
1013         CX_reg(context) = HIWORD(dw);
1014         DX_reg(context) = LOWORD(dw);
1015         break;
1016
1017     case 0x0205:  /* Set protected mode interrupt vector */
1018         TRACE("set protected mode interrupt handler (0x%02x,%p), stub!\n",
1019             BL_reg(context),PTR_SEG_OFF_TO_LIN(CX_reg(context),DX_reg(context)));
1020         INT_SetPMHandler( BL_reg(context),
1021                           (FARPROC16)PTR_SEG_OFF_TO_SEGPTR( CX_reg(context),
1022                                                             DX_reg(context) ));
1023         break;
1024
1025     case 0x0300:  /* Simulate real mode interrupt */
1026         CallRMInt( context );
1027         break;
1028
1029     case 0x0301:  /* Call real mode procedure with far return */
1030         CallRMProc( context, FALSE );
1031         break;
1032
1033     case 0x0302:  /* Call real mode procedure with interrupt return */
1034         CallRMProc( context, TRUE );
1035         break;
1036
1037     case 0x0303:  /* Allocate Real Mode Callback Address */
1038         AllocRMCB( context );
1039         break;
1040
1041     case 0x0304:  /* Free Real Mode Callback Address */
1042         FreeRMCB( context );
1043         break;
1044
1045     case 0x0305:  /* Get State Save/Restore Addresses */
1046         TRACE("get state save/restore addresses\n");
1047         /* we probably won't need this kind of state saving */
1048         AX_reg(context) = 0;
1049         /* real mode: just point to the lret */
1050         BX_reg(context) = DPMI_wrap_seg;
1051         ECX_reg(context) = 2;
1052         /* protected mode: don't have any handler yet... */
1053         FIXME("no protected-mode dummy state save/restore handler yet\n");
1054         SI_reg(context) = 0;
1055         EDI_reg(context) = 0;
1056         break;
1057
1058     case 0x0306:  /* Get Raw Mode Switch Addresses */
1059         TRACE("get raw mode switch addresses\n");
1060         if (lpDosTask) {
1061           /* real mode, point to standard DPMI return wrapper */
1062           BX_reg(context) = DPMI_wrap_seg;
1063           ECX_reg(context) = 0;
1064           /* protected mode, point to DPMI call wrapper */
1065           SI_reg(context) = lpDosTask->dpmi_sel;
1066           EDI_reg(context) = 8; /* offset of the INT 0x31 call */
1067         } else {
1068           ERR("win app attempting to get raw mode switch!\n");
1069           AX_reg(context) = 0x8001; /* unsupported function */
1070           SET_CFLAG(context);
1071         }
1072         break;
1073     case 0x0400:  /* Get DPMI version */
1074         TRACE("get DPMI version\n");
1075         {
1076             SYSTEM_INFO si;
1077
1078             GetSystemInfo(&si);
1079             AX_reg(context) = 0x005a;  /* DPMI version 0.90 */
1080             BX_reg(context) = 0x0005;  /* Flags: 32-bit, virtual memory */
1081             CL_reg(context) = si.wProcessorLevel;
1082             DX_reg(context) = 0x0102;  /* Master/slave interrupt controller base*/
1083             break;
1084         }
1085     case 0x0500:  /* Get free memory information */
1086         TRACE("get free memory information\n");
1087         {
1088             MEMMANINFO mmi;
1089
1090             mmi.dwSize = sizeof(mmi);
1091             MemManInfo16(&mmi);
1092             ptr = (BYTE *)PTR_SEG_OFF_TO_LIN(ES_reg(context),DI_reg(context));
1093             /* the layout is just the same as MEMMANINFO, but without
1094              * the dwSize entry.
1095              */
1096             memcpy(ptr,((char*)&mmi)+4,sizeof(mmi)-4);
1097             break;
1098         }
1099     case 0x0501:  /* Allocate memory block */
1100         TRACE("allocate memory block (%ld)\n",MAKELONG(CX_reg(context),BX_reg(context)));
1101         if (!(ptr = (BYTE *)DPMI_xalloc(MAKELONG(CX_reg(context), BX_reg(context)))))
1102         {
1103             AX_reg(context) = 0x8012;  /* linear memory not available */
1104             SET_CFLAG(context);
1105         } else {
1106             BX_reg(context) = SI_reg(context) = HIWORD(W32S_WINE2APP(ptr, offset));
1107             CX_reg(context) = DI_reg(context) = LOWORD(W32S_WINE2APP(ptr, offset));
1108         }
1109         break;
1110
1111     case 0x0502:  /* Free memory block */
1112         TRACE("free memory block (0x%08lx)\n",
1113                      W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context)), offset));
1114         DPMI_xfree( (void *)W32S_APP2WINE(MAKELONG(DI_reg(context),
1115                                                SI_reg(context)), offset) );
1116         break;
1117
1118     case 0x0503:  /* Resize memory block */
1119         TRACE("resize memory block (0x%08lx,%ld)\n",
1120                      W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context)), offset),
1121                      MAKELONG(CX_reg(context),BX_reg(context)));
1122         if (!(ptr = (BYTE *)DPMI_xrealloc(
1123                 (void *)W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context)), offset),
1124                 MAKELONG(CX_reg(context),BX_reg(context)))))
1125         {
1126             AX_reg(context) = 0x8012;  /* linear memory not available */
1127             SET_CFLAG(context);
1128         } else {
1129             BX_reg(context) = SI_reg(context) = HIWORD(W32S_WINE2APP(ptr, offset));
1130             CX_reg(context) = DI_reg(context) = LOWORD(W32S_WINE2APP(ptr, offset));
1131         }
1132         break;
1133
1134     case 0x0507:  /* Modify page attributes */
1135         FIXME("modify page attributes unimplemented\n");
1136         break;  /* Just ignore it */
1137
1138     case 0x0600:  /* Lock linear region */
1139         FIXME("lock linear region unimplemented\n");
1140         break;  /* Just ignore it */
1141
1142     case 0x0601:  /* Unlock linear region */
1143         FIXME("unlock linear region unimplemented\n");
1144         break;  /* Just ignore it */
1145
1146     case 0x0602:  /* Unlock real-mode region */
1147         FIXME("unlock realmode region unimplemented\n");
1148         break;  /* Just ignore it */
1149
1150     case 0x0603:  /* Lock real-mode region */
1151         FIXME("lock realmode region unimplemented\n");
1152         break;  /* Just ignore it */
1153
1154     case 0x0604:  /* Get page size */
1155         TRACE("get pagesize\n");
1156         BX_reg(context) = 0;
1157         CX_reg(context) = VIRTUAL_GetPageSize();
1158         break;
1159
1160     case 0x0702:  /* Mark page as demand-paging candidate */
1161         FIXME("mark page as demand-paging candidate\n");
1162         break;  /* Just ignore it */
1163
1164     case 0x0703:  /* Discard page contents */
1165         FIXME("discard page contents\n");
1166         break;  /* Just ignore it */
1167
1168      case 0x0800:  /* Physical address mapping */
1169         FIXME("map real to linear (0x%08lx)\n",MAKELONG(CX_reg(context),BX_reg(context)));
1170          if(!(ptr=DOSMEM_MapRealToLinear(MAKELONG(CX_reg(context),BX_reg(context)))))
1171          {
1172              AX_reg(context) = 0x8021;
1173              SET_CFLAG(context);
1174          }
1175          else
1176          {
1177              BX_reg(context) = HIWORD(W32S_WINE2APP(ptr, offset));
1178              CX_reg(context) = LOWORD(W32S_WINE2APP(ptr, offset));
1179              RESET_CFLAG(context);
1180          }
1181          break;
1182
1183     default:
1184         INT_BARF( context, 0x31 );
1185         AX_reg(context) = 0x8001;  /* unsupported function */
1186         SET_CFLAG(context);
1187         break;
1188     }
1189
1190 }