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 #if HAVE_FIXED_BROKEN_ASSEMBLER_BELOW
 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 #else
 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 #endif
 512         NewRMCB->address = MAKELONG(0, uParagraph);
 513         NewRMCB->next = FirstRMCB;
 514         FirstRMCB = NewRMCB;
 515     }
 516     return NewRMCB;
 517 }
 518
 519
 520 static void AllocRMCB( CONTEXT86 *context )
 521 {
 522     RMCB *NewRMCB = DPMI_AllocRMCB();
 523
 524     TRACE("Function to call: %04x:%04x\n", (WORD)DS_reg(context), SI_reg(context) );
 525
 526     if (NewRMCB)
 527     {
 528         /* FIXME: if 32-bit DPMI client, use ESI and EDI */
 529         NewRMCB->proc_ofs = SI_reg(context);
 530         NewRMCB->proc_sel = DS_reg(context);
 531         NewRMCB->regs_ofs = DI_reg(context);
 532         NewRMCB->regs_sel = ES_reg(context);
 533         SET_LOWORD( ECX_reg(context), HIWORD(NewRMCB->address) );
 534         SET_LOWORD( EDX_reg(context), LOWORD(NewRMCB->address) );
 535     }
 536     else
 537     {
 538         SET_LOWORD( EAX_reg(context), 0x8015 ); /* callback unavailable */
 539         SET_CFLAG(context);
 540     }
 541 }
 542
 543
 544 FARPROC16 WINAPI DPMI_AllocInternalRMCB( RMCBPROC proc )
 545 {
 546     RMCB *NewRMCB = DPMI_AllocRMCB();
 547
 548     if (NewRMCB) {
 549         NewRMCB->proc_ofs = (DWORD)proc;
 550         NewRMCB->proc_sel = 0;
 551         NewRMCB->regs_ofs = 0;
 552         NewRMCB->regs_sel = 0;
 553         return (FARPROC16)(NewRMCB->address);
 554     }
 555     return NULL;
 556 }
 557
 558
 559 static int DPMI_FreeRMCB( DWORD address )
 560 {
 561     RMCB *CurrRMCB = FirstRMCB;
 562     RMCB *PrevRMCB = NULL;
 563
 564     while (CurrRMCB && (CurrRMCB->address != address))
 565     {
 566         PrevRMCB = CurrRMCB;
 567         CurrRMCB = CurrRMCB->next;
 568     }
 569     if (CurrRMCB)
 570     {
 571         if (PrevRMCB)
 572         PrevRMCB->next = CurrRMCB->next;
 573             else
 574         FirstRMCB = CurrRMCB->next;
 575         DOSMEM_FreeBlock(0, DOSMEM_MapRealToLinear(CurrRMCB->address));
 576         HeapFree(GetProcessHeap(), 0, CurrRMCB);
 577         return 0;
 578     }
 579     return 1;
 580 }
 581
 582
 583 static void FreeRMCB( CONTEXT86 *context )
 584 {
 585     FIXME("callback address: %04x:%04x\n",
 586           CX_reg(context), DX_reg(context));
 587
 588     if (DPMI_FreeRMCB(MAKELONG(DX_reg(context), CX_reg(context)))) {
 589         SET_LOWORD( EAX_reg(context), 0x8024 ); /* invalid callback address */
 590         SET_CFLAG(context);
 591     }
 592 }
 593
 594
 595 void WINAPI DPMI_FreeInternalRMCB( FARPROC16 proc )
 596 {
 597     DPMI_FreeRMCB( (DWORD)proc );
 598 }
 599
 600
 601 #ifdef MZ_SUPPORTED
 602 /* (see loader/dos/module.c, function MZ_InitDPMI) */
 603
 604 static void StartPM( CONTEXT86 *context, LPDOSTASK lpDosTask )
 605 {
 606     char *base = DOSMEM_MemoryBase(0);
 607     UINT16 cs, ss, ds, es;
 608     CONTEXT86 pm_ctx;
 609     DWORD psp_ofs = (DWORD)(lpDosTask->psp_seg<<4);
 610     PDB16 *psp = (PDB16 *)(base + psp_ofs);
 611     HANDLE16 env_seg = psp->environment;
 612     int is32;
 613
 614     RESET_CFLAG(context);
 615     lpDosTask->dpmi_flag = AX_reg(context);
 616     is32 = lpDosTask->dpmi_flag & 1;
 617 /* our mode switch wrapper have placed the desired CS into DX */
 618     cs = SELECTOR_AllocBlock( base + (DWORD)(DX_reg(context)<<4), 0x10000, SEGMENT_CODE, FALSE, FALSE );
 619 /* due to a flaw in some CPUs (at least mine), it is best to mark stack segments as 32-bit if they
 620    can be used in 32-bit code. Otherwise, these CPUs may not set the high word of esp during a
 621    ring transition (from kernel code) to the 16-bit stack, and this causes trouble if executing
 622    32-bit code using this stack. */
 623     ss = SELECTOR_AllocBlock( base + (DWORD)(SS_reg(context)<<4), 0x10000, SEGMENT_DATA, is32, FALSE );
 624 /* do the same for the data segments, just in case */
 625     if (DS_reg(context) == SS_reg(context)) ds = ss;
 626     else ds = SELECTOR_AllocBlock( base + (DWORD)(DS_reg(context)<<4), 0x10000, SEGMENT_DATA, is32, FALSE );
 627     es = SELECTOR_AllocBlock( base + psp_ofs, 0x100, SEGMENT_DATA, is32, FALSE );
 628 /* convert environment pointer, as the spec says, but we're a bit lazy about the size here... */
 629     psp->environment = SELECTOR_AllocBlock( base + (DWORD)(env_seg<<4),
 630                                             0x10000, SEGMENT_DATA, FALSE, FALSE );
 631
 632     pm_ctx = *context;
 633     CS_reg(&pm_ctx) = lpDosTask->dpmi_sel;
 634 /* our mode switch wrapper expects the new CS in DX, and the new SS in AX */
 635     EAX_reg(&pm_ctx) = ss;
 636     EDX_reg(&pm_ctx) = cs;
 637     DS_reg(&pm_ctx) = ds;
 638     ES_reg(&pm_ctx) = es;
 639     FS_reg(&pm_ctx) = 0;
 640     GS_reg(&pm_ctx) = 0;
 641
 642     TRACE("DOS program is now entering protected mode\n");
 643     Callbacks->CallRegisterShortProc(&pm_ctx, 0);
 644
 645     /* in the current state of affairs, we won't ever actually return here... */
 646     /* we should have int21/ah=4c do it someday, though... */
 647
 648     SELECTOR_FreeBlock(psp->environment, 1);
 649     psp->environment = env_seg;
 650     SELECTOR_FreeBlock(es, 1);
 651     if (ds != ss) SELECTOR_FreeBlock(ds, 1);
 652     SELECTOR_FreeBlock(ss, 1);
 653     SELECTOR_FreeBlock(cs, 1);
 654 }
 655
 656 /* DPMI Raw Mode Switch handler */
 657
 658 #if 0
 659 void WINAPI DPMI_RawModeSwitch( SIGCONTEXT *context )
 660 {
 661   LPDOSTASK lpDosTask = MZ_Current();
 662   CONTEXT86 rm_ctx;
 663   int ret;
 664
 665   if (!lpDosTask) {
 666     /* we could probably start a DPMI-only dosmod task here, but I doubt
 667        anything other than real DOS apps want to call raw mode switch */
 668     ERR("attempting raw mode switch without DOS task!\n");
 669     ExitProcess(1);
 670   }
 671   /* initialize real-mode context as per spec */
 672   memset(&rm_ctx, 0, sizeof(rm_ctx));
 673   DS_reg(&rm_ctx) = AX_sig(context);
 674   ES_reg(&rm_ctx) = CX_sig(context);
 675   SS_reg(&rm_ctx) = DX_sig(context);
 676   ESP_reg(&rm_ctx) = EBX_sig(context);
 677   CS_reg(&rm_ctx) = SI_sig(context);
 678   EIP_reg(&rm_ctx) = EDI_sig(context);
 679   EBP_reg(&rm_ctx) = EBP_sig(context);
 680   FS_reg(&rm_ctx) = 0;
 681   GS_reg(&rm_ctx) = 0;
 682   EFL_reg(&rm_ctx) = EFL_sig(context); /* at least we need the IF flag */
 683
 684   /* enter real mode again */
 685   TRACE("re-entering real mode at %04lx:%04lx\n",
 686         CS_reg(&rm_ctx),EIP_reg(&rm_ctx));
 687   ret = DOSVM_Enter( &rm_ctx );
 688   /* when the real-mode stuff call its mode switch address,
 689      DOSVM_Enter will return and we will continue here */
 690
 691   if (ret<0) {
 692     /* if the sync was lost, there's no way to recover */
 693     ExitProcess(1);
 694   }
 695
 696   /* alter protected-mode context as per spec */
 697   DS_sig(context) = AX_reg(&rm_ctx);
 698   ES_sig(context) = CX_reg(&rm_ctx);
 699   SS_sig(context) = DX_reg(&rm_ctx);
 700   ESP_sig(context) = EBX_reg(&rm_ctx);
 701   CS_sig(context) = SI_reg(&rm_ctx);
 702   EIP_sig(context) = EDI_reg(&rm_ctx);
 703   EBP_sig(context) = EBP_reg(&rm_ctx);
 704   FS_sig(context) = 0;
 705   GS_sig(context) = 0;
 706
 707   /* Return to new address and hope that we didn't mess up */
 708   TRACE("re-entering protected mode at %04x:%08lx\n",
 709         CS_sig(context), EIP_sig(context));
 710 }
 711 #endif
 712
 713 #else
 714 #if 0
 715 void WINAPI DPMI_RawModeSwitch( SIGCONTEXT *context )
 716 {
 717   ERR("don't even think about DPMI raw mode switch without DOS support!\n");
 718   ExitProcess(1);
 719 }
 720 #endif
 721 #endif
 722
 723 #define DOS_APP_ISDOS(addr,base) ((addr) < 0x110000)
 724 #define DOS_WINE_ISDOS(addr,base) (((addr) >= (base)) && ((addr) < (base) + 0x110000))
 725 #define DOS_UC_APPTOWINE(addr,base) ((addr) + (base))
 726 #define DOS_UC_WINETOAPP(addr,base) ((addr) - (base))
 727 #define DOS_APPTOWINE(addr,base) (DOS_APP_ISDOS(addr,base) ? DOS_UC_APPTOWINE(addr,base) : (addr))
 728 #define DOS_WINETOAPP(addr,base) (DOS_WINE_ISDOS(addr,base) ? DOS_UC_WINETOAPP(addr,base) : (addr))
 729 #define DOS_BADLIMIT(addr,base,limit) \
 730   ((limit == 0xffffffff) || /* disallow "fat DS" for now */ \
 731    (DOS_WINE_ISDOS(addr,base) && \
 732     ((addr) + (limit) > (base) + 0x110000)))
 733
 734 /**********************************************************************
 735  *          INT_Int31Handler
 736  *
 737  * Handler for int 31h (DPMI).
 738  */
 739
 740 void WINAPI INT_Int31Handler( CONTEXT86 *context )
 741 {
 742     /*
 743      * Note: For Win32s processes, the whole linear address space is
 744      *       shifted by 0x10000 relative to the OS linear address space.
 745      *       See the comment in msdos/vxd.c.
 746      */
 747     DWORD offset = W32S_APPLICATION() ? W32S_OFFSET : 0;
 748
 749     DWORD dw;
 750     BYTE *ptr;
 751
 752     LPDOSTASK lpDosTask = MZ_Current();
 753
 754 #ifdef MZ_SUPPORTED
 755     if (ISV86(context) && lpDosTask) {
 756         /* Called from real mode, check if it's our wrapper */
 757         TRACE("called from real mode\n");
 758         if (CS_reg(context)==lpDosTask->dpmi_seg) {
 759             /* This is the protected mode switch */
 760             StartPM(context,lpDosTask);
 761             return;
 762         } else
 763         if (CS_reg(context)==lpDosTask->xms_seg) {
 764             /* This is the XMS driver entry point */
 765             XMS_Handler(context);
 766             return;
 767         } else
 768         {
 769             /* Check for RMCB */
 770             RMCB *CurrRMCB = FirstRMCB;
 771
 772             while (CurrRMCB && (HIWORD(CurrRMCB->address) != CS_reg(context)))
 773                 CurrRMCB = CurrRMCB->next;
 774
 775             if (CurrRMCB) {
 776                 /* RMCB call, propagate to protected-mode handler */
 777                 DPMI_CallRMCBProc(context, CurrRMCB, lpDosTask->dpmi_flag);
 778                 return;
 779             }
 780         }
 781     }
 782 #endif
 783
 784     RESET_CFLAG(context);
 785     switch(AX_reg(context))
 786     {
 787     case 0x0000:  /* Allocate LDT descriptors */
 788         TRACE("allocate LDT descriptors (%d)\n",CX_reg(context));
 789         if (!(EAX_reg(context) = AllocSelectorArray16( CX_reg(context) )))
 790         {
 791             TRACE("failed\n");
 792             EAX_reg(context) = 0x8011;  /* descriptor unavailable */
 793             SET_CFLAG(context);
 794         }
 795         TRACE("success, array starts at 0x%04x\n",AX_reg(context));
 796         break;
 797
 798     case 0x0001:  /* Free LDT descriptor */
 799         TRACE("free LDT descriptor (0x%04x)\n",BX_reg(context));
 800         if (FreeSelector16( BX_reg(context) ))
 801         {
 802             EAX_reg(context) = 0x8022;  /* invalid selector */
 803             SET_CFLAG(context);
 804         }
 805         else
 806         {
 807             /* If a segment register contains the selector being freed, */
 808             /* set it to zero. */
 809             if (!((DS_reg(context)^BX_reg(context)) & ~3)) DS_reg(context) = 0;
 810             if (!((ES_reg(context)^BX_reg(context)) & ~3)) ES_reg(context) = 0;
 811             if (!((FS_reg(context)^BX_reg(context)) & ~3)) FS_reg(context) = 0;
 812             if (!((GS_reg(context)^BX_reg(context)) & ~3)) GS_reg(context) = 0;
 813         }
 814         break;
 815
 816     case 0x0002:  /* Real mode segment to descriptor */
 817         TRACE("real mode segment to descriptor (0x%04x)\n",BX_reg(context));
 818         {
 819             WORD entryPoint = 0;  /* KERNEL entry point for descriptor */
 820             switch(BX_reg(context))
 821             {
 822             case 0x0000: entryPoint = 183; break;  /* __0000H */
 823             case 0x0040: entryPoint = 193; break;  /* __0040H */
 824             case 0xa000: entryPoint = 174; break;  /* __A000H */
 825             case 0xb000: entryPoint = 181; break;  /* __B000H */
 826             case 0xb800: entryPoint = 182; break;  /* __B800H */
 827             case 0xc000: entryPoint = 195; break;  /* __C000H */
 828             case 0xd000: entryPoint = 179; break;  /* __D000H */
 829             case 0xe000: entryPoint = 190; break;  /* __E000H */
 830             case 0xf000: entryPoint = 194; break;  /* __F000H */
 831             default:
 832                 EAX_reg(context) = DOSMEM_AllocSelector(BX_reg(context));
 833                 break;
 834             }
 835             if (entryPoint)
 836                 EAX_reg(context) = LOWORD(NE_GetEntryPoint( GetModuleHandle16( "KERNEL" ),
 837                                                             entryPoint ));
 838         }
 839         break;
 840
 841     case 0x0003:  /* Get next selector increment */
 842         TRACE("get selector increment (__AHINCR)\n");
 843         EAX_reg(context) = __AHINCR;
 844         break;
 845
 846     case 0x0004:  /* Lock selector (not supported) */
 847         FIXME("lock selector not supported\n");
 848         EAX_reg(context) = 0;  /* FIXME: is this a correct return value? */
 849         break;
 850
 851     case 0x0005:  /* Unlock selector (not supported) */
 852         FIXME("unlock selector not supported\n");
 853         EAX_reg(context) = 0;  /* FIXME: is this a correct return value? */
 854         break;
 855
 856     case 0x0006:  /* Get selector base address */
 857         TRACE("get selector base address (0x%04x)\n",BX_reg(context));
 858         if (!(dw = GetSelectorBase( BX_reg(context) )))
 859         {
 860             EAX_reg(context) = 0x8022;  /* invalid selector */
 861             SET_CFLAG(context);
 862         }
 863         else
 864         {
 865 #ifdef MZ_SUPPORTED
 866             if (lpDosTask) {
 867                 DWORD base = (DWORD)DOSMEM_MemoryBase(lpDosTask->hModule);
 868                 dw = DOS_WINETOAPP(dw, base);
 869             }
 870 #endif
 871             CX_reg(context) = HIWORD(W32S_WINE2APP(dw, offset));
 872             DX_reg(context) = LOWORD(W32S_WINE2APP(dw, offset));
 873         }
 874         break;
 875
 876     case 0x0007:  /* Set selector base address */
 877         TRACE("set selector base address (0x%04x,0x%08lx)\n",
 878                      BX_reg(context),
 879                      W32S_APP2WINE(MAKELONG(DX_reg(context),CX_reg(context)), offset));
 880         dw = W32S_APP2WINE(MAKELONG(DX_reg(context), CX_reg(context)), offset);
 881 #ifdef MZ_SUPPORTED
 882         if (lpDosTask) {
 883             DWORD base = (DWORD)DOSMEM_MemoryBase(lpDosTask->hModule);
 884             dw = DOS_APPTOWINE(dw, base);
 885         }
 886 #endif
 887         SetSelectorBase(BX_reg(context), dw);
 888         break;
 889
 890     case 0x0008:  /* Set selector limit */
 891         TRACE("set selector limit (0x%04x,0x%08lx)\n",BX_reg(context),MAKELONG(DX_reg(context),CX_reg(context)));
 892         dw = MAKELONG( DX_reg(context), CX_reg(context) );
 893 #ifdef MZ_SUPPORTED
 894         if (lpDosTask) {
 895             DWORD base = (DWORD)DOSMEM_MemoryBase(lpDosTask->hModule);
 896             DWORD sbase = GetSelectorBase( BX_reg(context) );
 897             if (!sbase) {
 898                 /* the app has set the limit without setting the base,
 899                  * it must be relying on that the default should be DOS space;
 900                  * so set the base address now */
 901                 SetSelectorBase( BX_reg(context), sbase = base );
 902                 if (dw == 0xffffffff) {
 903                     /* djgpp does this without checking (in _dos_ds setup, crt1.c),
 904                      * so we have to override the limit here */
 905                     dw = 0x110000;
 906                 }
 907             }
 908             if (DOS_BADLIMIT(sbase, base, dw)) {
 909                 AX_reg(context) = 0x8021;  /* invalid value */
 910                 SET_CFLAG(context);
 911                 break;
 912             }
 913         }
 914 #endif
 915         SetSelectorLimit16( BX_reg(context), dw );
 916         break;
 917
 918     case 0x0009:  /* Set selector access rights */
 919         TRACE("set selector access rights(0x%04x,0x%04x)\n",BX_reg(context),CX_reg(context));
 920         SelectorAccessRights16( BX_reg(context), 1, CX_reg(context) );
 921         break;
 922
 923     case 0x000a:  /* Allocate selector alias */
 924         TRACE("allocate selector alias (0x%04x)\n",BX_reg(context));
 925         if (!(AX_reg(context) = AllocCStoDSAlias16( BX_reg(context) )))
 926         {
 927             AX_reg(context) = 0x8011;  /* descriptor unavailable */
 928             SET_CFLAG(context);
 929         }
 930         break;
 931
 932     case 0x000b:  /* Get descriptor */
 933         TRACE("get descriptor (0x%04x)\n",BX_reg(context));
 934         {
 935             ldt_entry entry;
 936             LDT_GetEntry( SELECTOR_TO_ENTRY( BX_reg(context) ), &entry );
 937 #ifdef MZ_SUPPORTED
 938             if (lpDosTask) {
 939                 DWORD base = (DWORD)DOSMEM_MemoryBase(lpDosTask->hModule);
 940                 entry.base = DOS_WINETOAPP(entry.base, base);
 941             }
 942 #endif
 943             entry.base = W32S_WINE2APP(entry.base, offset);
 944
 945             /* FIXME: should use ES:EDI for 32-bit clients */
 946             LDT_EntryToBytes( PTR_SEG_OFF_TO_LIN( ES_reg(context),
 947                                                   DI_reg(context) ), &entry );
 948         }
 949         break;
 950
 951     case 0x000c:  /* Set descriptor */
 952         TRACE("set descriptor (0x%04x)\n",BX_reg(context));
 953         {
 954             ldt_entry entry;
 955             LDT_BytesToEntry( PTR_SEG_OFF_TO_LIN( ES_reg(context),
 956                                                   DI_reg(context) ), &entry );
 957             entry.base = W32S_APP2WINE(entry.base, offset);
 958 #ifdef MZ_SUPPORTED
 959             if (lpDosTask) {
 960                 DWORD base = (DWORD)DOSMEM_MemoryBase(lpDosTask->hModule);
 961                 entry.base = DOS_APPTOWINE(entry.base, base);
 962                 if (DOS_BADLIMIT(entry.base, base, entry.limit)) {
 963                     AX_reg(context) = 0x8021;  /* invalid value */
 964                     SET_CFLAG(context);
 965                     break;
 966                 }
 967             }
 968 #endif
 969
 970             LDT_SetEntry( SELECTOR_TO_ENTRY( BX_reg(context) ), &entry );
 971         }
 972         break;
 973
 974     case 0x000d:  /* Allocate specific LDT descriptor */
 975         FIXME("allocate descriptor (0x%04x), stub!\n",BX_reg(context));
 976         AX_reg(context) = 0x8011; /* descriptor unavailable */
 977         SET_CFLAG(context);
 978         break;
 979     case 0x0100:  /* Allocate DOS memory block */
 980         TRACE("allocate DOS memory block (0x%x paragraphs)\n",BX_reg(context));
 981         dw = GlobalDOSAlloc16((DWORD)BX_reg(context)<<4);
 982         if (dw) {
 983             AX_reg(context) = HIWORD(dw);
 984             DX_reg(context) = LOWORD(dw);
 985         } else {
 986             AX_reg(context) = 0x0008; /* insufficient memory */
 987             BX_reg(context) = DOSMEM_Available(0)>>4;
 988             SET_CFLAG(context);
 989         }
 990         break;
 991     case 0x0101:  /* Free DOS memory block */
 992         TRACE("free DOS memory block (0x%04x)\n",DX_reg(context));
 993         dw = GlobalDOSFree16(DX_reg(context));
 994         if (!dw) {
 995             AX_reg(context) = 0x0009; /* memory block address invalid */
 996             SET_CFLAG(context);
 997         }
 998         break;
 999     case 0x0200: /* get real mode interrupt vector */
1000         FIXME("get realmode interupt vector(0x%02x) unimplemented.\n",
1001               BL_reg(context));
1002         SET_CFLAG(context);
1003         break;
1004     case 0x0201: /* set real mode interrupt vector */
1005         FIXME("set realmode interupt vector(0x%02x,0x%04x:0x%04x) unimplemented\n", BL_reg(context),CX_reg(context),DX_reg(context));
1006         SET_CFLAG(context);
1007         break;
1008     case 0x0204:  /* Get protected mode interrupt vector */
1009         TRACE("get protected mode interrupt handler (0x%02x), stub!\n",BL_reg(context));
1010         dw = (DWORD)INT_GetPMHandler( BL_reg(context) );
1011         CX_reg(context) = HIWORD(dw);
1012         DX_reg(context) = LOWORD(dw);
1013         break;
1014
1015     case 0x0205:  /* Set protected mode interrupt vector */
1016         TRACE("set protected mode interrupt handler (0x%02x,%p), stub!\n",
1017             BL_reg(context),PTR_SEG_OFF_TO_LIN(CX_reg(context),DX_reg(context)));
1018         INT_SetPMHandler( BL_reg(context),
1019                           (FARPROC16)PTR_SEG_OFF_TO_SEGPTR( CX_reg(context),
1020                                                             DX_reg(context) ));
1021         break;
1022
1023     case 0x0300:  /* Simulate real mode interrupt */
1024         CallRMInt( context );
1025         break;
1026
1027     case 0x0301:  /* Call real mode procedure with far return */
1028         CallRMProc( context, FALSE );
1029         break;
1030
1031     case 0x0302:  /* Call real mode procedure with interrupt return */
1032         CallRMProc( context, TRUE );
1033         break;
1034
1035     case 0x0303:  /* Allocate Real Mode Callback Address */
1036         AllocRMCB( context );
1037         break;
1038
1039     case 0x0304:  /* Free Real Mode Callback Address */
1040         FreeRMCB( context );
1041         break;
1042
1043     case 0x0305:  /* Get State Save/Restore Addresses */
1044         TRACE("get state save/restore addresses\n");
1045         /* we probably won't need this kind of state saving */
1046         AX_reg(context) = 0;
1047         /* real mode: just point to the lret */
1048         BX_reg(context) = DPMI_wrap_seg;
1049         ECX_reg(context) = 2;
1050         /* protected mode: don't have any handler yet... */
1051         FIXME("no protected-mode dummy state save/restore handler yet\n");
1052         SI_reg(context) = 0;
1053         EDI_reg(context) = 0;
1054         break;
1055
1056     case 0x0306:  /* Get Raw Mode Switch Addresses */
1057         TRACE("get raw mode switch addresses\n");
1058         if (lpDosTask) {
1059           /* real mode, point to standard DPMI return wrapper */
1060           BX_reg(context) = DPMI_wrap_seg;
1061           ECX_reg(context) = 0;
1062           /* protected mode, point to DPMI call wrapper */
1063           SI_reg(context) = lpDosTask->dpmi_sel;
1064           EDI_reg(context) = 8; /* offset of the INT 0x31 call */
1065         } else {
1066           ERR("win app attempting to get raw mode switch!\n");
1067           AX_reg(context) = 0x8001; /* unsupported function */
1068           SET_CFLAG(context);
1069         }
1070         break;
1071     case 0x0400:  /* Get DPMI version */
1072         TRACE("get DPMI version\n");
1073         {
1074             SYSTEM_INFO si;
1075
1076             GetSystemInfo(&si);
1077             AX_reg(context) = 0x005a;  /* DPMI version 0.90 */
1078             BX_reg(context) = 0x0005;  /* Flags: 32-bit, virtual memory */
1079             CL_reg(context) = si.wProcessorLevel;
1080             DX_reg(context) = 0x0102;  /* Master/slave interrupt controller base*/
1081             break;
1082         }
1083     case 0x0500:  /* Get free memory information */
1084         TRACE("get free memory information\n");
1085         {
1086             MEMMANINFO mmi;
1087
1088             mmi.dwSize = sizeof(mmi);
1089             MemManInfo16(&mmi);
1090             ptr = (BYTE *)PTR_SEG_OFF_TO_LIN(ES_reg(context),DI_reg(context));
1091             /* the layout is just the same as MEMMANINFO, but without
1092              * the dwSize entry.
1093              */
1094             memcpy(ptr,((char*)&mmi)+4,sizeof(mmi)-4);
1095             break;
1096         }
1097     case 0x0501:  /* Allocate memory block */
1098         TRACE("allocate memory block (%ld)\n",MAKELONG(CX_reg(context),BX_reg(context)));
1099         if (!(ptr = (BYTE *)DPMI_xalloc(MAKELONG(CX_reg(context), BX_reg(context)))))
1100         {
1101             AX_reg(context) = 0x8012;  /* linear memory not available */
1102             SET_CFLAG(context);
1103         } else {
1104             BX_reg(context) = SI_reg(context) = HIWORD(W32S_WINE2APP(ptr, offset));
1105             CX_reg(context) = DI_reg(context) = LOWORD(W32S_WINE2APP(ptr, offset));
1106         }
1107         break;
1108
1109     case 0x0502:  /* Free memory block */
1110         TRACE("free memory block (0x%08lx)\n",
1111                      W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context)), offset));
1112         DPMI_xfree( (void *)W32S_APP2WINE(MAKELONG(DI_reg(context),
1113                                                SI_reg(context)), offset) );
1114         break;
1115
1116     case 0x0503:  /* Resize memory block */
1117         TRACE("resize memory block (0x%08lx,%ld)\n",
1118                      W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context)), offset),
1119                      MAKELONG(CX_reg(context),BX_reg(context)));
1120         if (!(ptr = (BYTE *)DPMI_xrealloc(
1121                 (void *)W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context)), offset),
1122                 MAKELONG(CX_reg(context),BX_reg(context)))))
1123         {
1124             AX_reg(context) = 0x8012;  /* linear memory not available */
1125             SET_CFLAG(context);
1126         } else {
1127             BX_reg(context) = SI_reg(context) = HIWORD(W32S_WINE2APP(ptr, offset));
1128             CX_reg(context) = DI_reg(context) = LOWORD(W32S_WINE2APP(ptr, offset));
1129         }
1130         break;
1131
1132     case 0x0507:  /* Modify page attributes */
1133         FIXME("modify page attributes unimplemented\n");
1134         break;  /* Just ignore it */
1135
1136     case 0x0600:  /* Lock linear region */
1137         FIXME("lock linear region unimplemented\n");
1138         break;  /* Just ignore it */
1139
1140     case 0x0601:  /* Unlock linear region */
1141         FIXME("unlock linear region unimplemented\n");
1142         break;  /* Just ignore it */
1143
1144     case 0x0602:  /* Unlock real-mode region */
1145         FIXME("unlock realmode region unimplemented\n");
1146         break;  /* Just ignore it */
1147
1148     case 0x0603:  /* Lock real-mode region */
1149         FIXME("lock realmode region unimplemented\n");
1150         break;  /* Just ignore it */
1151
1152     case 0x0604:  /* Get page size */
1153         TRACE("get pagesize\n");
1154         BX_reg(context) = 0;
1155         CX_reg(context) = VIRTUAL_GetPageSize();
1156         break;
1157
1158     case 0x0702:  /* Mark page as demand-paging candidate */
1159         FIXME("mark page as demand-paging candidate\n");
1160         break;  /* Just ignore it */
1161
1162     case 0x0703:  /* Discard page contents */
1163         FIXME("discard page contents\n");
1164         break;  /* Just ignore it */
1165
1166      case 0x0800:  /* Physical address mapping */
1167         FIXME("map real to linear (0x%08lx)\n",MAKELONG(CX_reg(context),BX_reg(context)));
1168          if(!(ptr=DOSMEM_MapRealToLinear(MAKELONG(CX_reg(context),BX_reg(context)))))
1169          {
1170              AX_reg(context) = 0x8021;
1171              SET_CFLAG(context);
1172          }
1173          else
1174          {
1175              BX_reg(context) = HIWORD(W32S_WINE2APP(ptr, offset));
1176              CX_reg(context) = LOWORD(W32S_WINE2APP(ptr, offset));
1177              RESET_CFLAG(context);
1178          }
1179          break;
1180
1181     default:
1182         INT_BARF( context, 0x31 );
1183         AX_reg(context) = 0x8001;  /* unsupported function */
1184         SET_CFLAG(context);
1185         break;
1186     }
1187
1188 }