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 "miscemu.h"
  14 #include "msdos.h"
  15 #include "dosexe.h"
  16 #include "task.h"
  17 #include "toolhelp.h"
  18 #include "selectors.h"
  19 #include "process.h"
  20 #include "callback.h"
  21 #include "debugtools.h"
  22
  23 DEFAULT_DEBUG_CHANNEL(int31);
  24
  25 #define DOS_GET_DRIVE(reg) ((reg) ? (reg) - 1 : DRIVE_GetCurrentDrive())
  26
  27 void CreateBPB(int drive, BYTE *data, BOOL16 limited);  /* defined in int21.c */
  28
  29 static void* lastvalloced = NULL;
  30
  31 /* Structure for real-mode callbacks */
  32 typedef struct
  33 {
  34     DWORD edi;
  35     DWORD esi;
  36     DWORD ebp;
  37     DWORD reserved;
  38     DWORD ebx;
  39     DWORD edx;
  40     DWORD ecx;
  41     DWORD eax;
  42     WORD  fl;
  43     WORD  es;
  44     WORD  ds;
  45     WORD  fs;
  46     WORD  gs;
  47     WORD  ip;
  48     WORD  cs;
  49     WORD  sp;
  50     WORD  ss;
  51 } REALMODECALL;
  52
  53
  54
  55 typedef struct tagRMCB {
  56     DWORD address;
  57     DWORD proc_ofs,proc_sel;
  58     DWORD regs_ofs,regs_sel;
  59     struct tagRMCB *next;
  60 } RMCB;
  61
  62 static RMCB *FirstRMCB = NULL;
  63
  64 UINT16 DPMI_wrap_seg;
  65
  66 /**********************************************************************
  67  *          DPMI_xalloc
  68  * special virtualalloc, allocates lineary monoton growing memory.
  69  * (the usual VirtualAlloc does not satisfy that restriction)
  70  */
  71 static LPVOID
  72 DPMI_xalloc(int len) {
  73         LPVOID  ret;
  74         LPVOID  oldlastv = lastvalloced;
  75
  76         if (lastvalloced) {
  77                 int     xflag = 0;
  78                 ret = NULL;
  79                 while (!ret) {
  80                         ret=VirtualAlloc(lastvalloced,len,MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
  81                         if (!ret)
  82                                 lastvalloced = (char *) lastvalloced + 0x10000;
  83                         /* we failed to allocate one in the first round.
  84                          * try non-linear
  85                          */
  86                         if (!xflag && (lastvalloced<oldlastv)) { /* wrapped */
  87                                 FIXME("failed to allocate lineary growing memory (%d bytes), using non-linear growing...\n",len);
  88                                 xflag++;
  89                         }
  90                         /* if we even fail to allocate something in the next
  91                          * round, return NULL
  92                          */
  93                         if ((xflag==1) && (lastvalloced >= oldlastv))
  94                                 xflag++;
  95                         if ((xflag==2) && (lastvalloced < oldlastv)) {
  96                                 FIXME("failed to allocate any memory of %d bytes!\n",len);
  97                                 return NULL;
  98                         }
  99                 }
 100         } else
 101                  ret=VirtualAlloc(NULL,len,MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
 102         lastvalloced = (LPVOID)(((DWORD)ret+len+0xffff)&~0xffff);
 103         return ret;
 104 }
 105
 106 static void
 107 DPMI_xfree(LPVOID ptr) {
 108         VirtualFree(ptr,0,MEM_RELEASE);
 109 }
 110
 111 /* FIXME: perhaps we could grow this mapped area... */
 112 static LPVOID
 113 DPMI_xrealloc(LPVOID ptr,int newsize) {
 114         MEMORY_BASIC_INFORMATION        mbi;
 115         LPVOID                          newptr;
 116
 117         newptr = DPMI_xalloc(newsize);
 118         if (ptr) {
 119                 if (!VirtualQuery(ptr,&mbi,sizeof(mbi))) {
 120                         FIXME("realloc of DPMI_xallocd region %p?\n",ptr);
 121                         return NULL;
 122                 }
 123                 if (mbi.State == MEM_FREE) {
 124                         FIXME("realloc of DPMI_xallocd region %p?\n",ptr);
 125                         return NULL;
 126                 }
 127                 /* We do not shrink allocated memory. most reallocs
 128                  * only do grows anyway
 129                  */
 130                 if (newsize<=mbi.RegionSize)
 131                         return ptr;
 132                 memcpy(newptr,ptr,mbi.RegionSize);
 133                 DPMI_xfree(ptr);
 134         }
 135         return newptr;
 136 }
 137 /**********************************************************************
 138  *          INT_GetRealModeContext
 139  */
 140 static void INT_GetRealModeContext( REALMODECALL *call, CONTEXT86 *context )
 141 {
 142     EAX_reg(context) = call->eax;
 143     EBX_reg(context) = call->ebx;
 144     ECX_reg(context) = call->ecx;
 145     EDX_reg(context) = call->edx;
 146     ESI_reg(context) = call->esi;
 147     EDI_reg(context) = call->edi;
 148     EBP_reg(context) = call->ebp;
 149     EFL_reg(context) = call->fl | V86_FLAG;
 150     EIP_reg(context) = call->ip;
 151     ESP_reg(context) = call->sp;
 152     CS_reg(context)  = call->cs;
 153     DS_reg(context)  = call->ds;
 154     ES_reg(context)  = call->es;
 155     FS_reg(context)  = call->fs;
 156     GS_reg(context)  = call->gs;
 157     SS_reg(context)  = call->ss;
 158 }
 159
 160
 161 /**********************************************************************
 162  *          INT_SetRealModeContext
 163  */
 164 static void INT_SetRealModeContext( REALMODECALL *call, CONTEXT86 *context )
 165 {
 166     call->eax = EAX_reg(context);
 167     call->ebx = EBX_reg(context);
 168     call->ecx = ECX_reg(context);
 169     call->edx = EDX_reg(context);
 170     call->esi = ESI_reg(context);
 171     call->edi = EDI_reg(context);
 172     call->ebp = EBP_reg(context);
 173     call->fl  = LOWORD(EFL_reg(context));
 174     call->ip  = LOWORD(EIP_reg(context));
 175     call->sp  = LOWORD(ESP_reg(context));
 176     call->cs  = CS_reg(context);
 177     call->ds  = DS_reg(context);
 178     call->es  = ES_reg(context);
 179     call->fs  = FS_reg(context);
 180     call->gs  = GS_reg(context);
 181     call->ss  = SS_reg(context);
 182 }
 183
 184 #ifdef __i386__
 185
 186 void DPMI_CallRMCB32(RMCB *rmcb, UINT16 ss, DWORD esp, UINT16*es, DWORD*edi)
 187 #if 0 /* original code, which early gccs puke on */
 188 {
 189     int _clobber;
 190     __asm__ __volatile__(
 191         "pushl %%ebp\n"
 192         "pushl %%ebx\n"
 193         "pushl %%es\n"
 194         "pushl %%ds\n"
 195         "pushfl\n"
 196         "mov %7,%%es\n"
 197         "mov %5,%%ds\n"
 198         ".byte 0x36, 0xff, 0x18\n" /* lcall *%ss:(%eax) */
 199         "popl %%ds\n"
 200         "mov %%es,%0\n"
 201         "popl %%es\n"
 202         "popl %%ebx\n"
 203         "popl %%ebp\n"
 204     : "=d" (*es), "=D" (*edi), "=S" (_clobber), "=a" (_clobber), "=c" (_clobber)
 205     : "0" (ss), "2" (esp),
 206       "4" (rmcb->regs_sel), "1" (rmcb->regs_ofs),
 207       "3" (&rmcb->proc_ofs) );
 208 }
 209 #else /* code generated by a gcc new enough */
 210 ;
 211 __ASM_GLOBAL_FUNC(DPMI_CallRMCB32,
 212     "pushl %ebp\n\t"
 213     "movl %esp,%ebp\n\t"
 214     "pushl %edi\n\t"
 215     "pushl %esi\n\t"
 216     "movl 0x8(%ebp),%eax\n\t"
 217     "movl 0x10(%ebp),%esi\n\t"
 218     "movl 0xc(%ebp),%edx\n\t"
 219     "movl 0x10(%eax),%ecx\n\t"
 220     "movl 0xc(%eax),%edi\n\t"
 221     "addl $0x4,%eax\n\t"
 222     "pushl %ebp\n\t"
 223     "pushl %ebx\n\t"
 224     "pushl %es\n\t"
 225     "pushl %ds\n\t"
 226     "pushfl\n\t"
 227     "mov %cx,%es\n\t"
 228     "mov %dx,%ds\n\t"
 229     ".byte 0x36, 0xff, 0x18\n\t" /* lcall *%ss:(%eax) */
 230     "popl %ds\n\t"
 231     "mov %es,%dx\n\t"
 232     "popl %es\n\t"
 233     "popl %ebx\n\t"
 234     "popl %ebp\n\t"
 235     "movl 0x14(%ebp),%eax\n\t"
 236     "movw %dx,(%eax)\n\t"
 237     "movl 0x18(%ebp),%edx\n\t"
 238     "movl %edi,(%edx)\n\t"
 239     "popl %esi\n\t"
 240     "popl %edi\n\t"
 241     "leave\n\t"
 242     "ret")
 243 #endif
 244
 245 #endif /* __i386__ */
 246
 247 /**********************************************************************
 248  *          DPMI_CallRMCBProc
 249  *
 250  * This routine does the hard work of calling a callback procedure.
 251  */
 252 static void DPMI_CallRMCBProc( CONTEXT86 *context, RMCB *rmcb, WORD flag )
 253 {
 254     if (IS_SELECTOR_SYSTEM( rmcb->proc_sel )) {
 255         /* Wine-internal RMCB, call directly */
 256         ((RMCBPROC)rmcb->proc_ofs)(context);
 257     } else {
 258 #ifdef __i386__
 259         UINT16 ss,es;
 260         DWORD esp,edi;
 261
 262         INT_SetRealModeContext((REALMODECALL *)PTR_SEG_OFF_TO_LIN( rmcb->regs_sel, rmcb->regs_ofs ), context);
 263         ss = SELECTOR_AllocBlock( DOSMEM_MemoryBase() + (DWORD)(SS_reg(context)<<4), 0x10000, SEGMENT_DATA, FALSE, FALSE );
 264         esp = ESP_reg(context);
 265
 266         FIXME("untested!\n");
 267
 268         /* The called proc ends with an IRET, and takes these parameters:
 269          * DS:ESI = pointer to real-mode SS:SP
 270          * ES:EDI = pointer to real-mode call structure
 271          * It returns:
 272          * ES:EDI = pointer to real-mode call structure (may be a copy)
 273          * It is the proc's responsibility to change the return CS:IP in the
 274          * real-mode call structure. */
 275         if (flag & 1) {
 276             /* 32-bit DPMI client */
 277             DPMI_CallRMCB32(rmcb, ss, esp, &es, &edi);
 278         } else {
 279             /* 16-bit DPMI client */
 280             CONTEXT86 ctx = *context;
 281             CS_reg(&ctx) = rmcb->proc_sel;
 282             EIP_reg(&ctx) = rmcb->proc_ofs;
 283             DS_reg(&ctx) = ss;
 284             ESI_reg(&ctx) = esp;
 285             ES_reg(&ctx) = rmcb->regs_sel;
 286             EDI_reg(&ctx) = rmcb->regs_ofs;
 287             /* FIXME: I'm pretty sure this isn't right - should push flags first */
 288             Callbacks->CallRegisterShortProc(&ctx, 0);
 289             es = ES_reg(&ctx);
 290             edi = EDI_reg(&ctx);
 291         }
 292         SELECTOR_FreeBlock(ss, 1);
 293         INT_GetRealModeContext((REALMODECALL*)PTR_SEG_OFF_TO_LIN( es, edi ), context);
 294 #else
 295         ERR("RMCBs only implemented for i386\n");
 296 #endif
 297     }
 298 }
 299
 300
 301 /**********************************************************************
 302  *          DPMI_CallRMProc
 303  *
 304  * This routine does the hard work of calling a real mode procedure.
 305  */
 306 int DPMI_CallRMProc( CONTEXT86 *context, LPWORD stack, int args, int iret )
 307 {
 308     LPWORD stack16;
 309     LPVOID addr = NULL; /* avoid gcc warning */
 310     LPDOSTASK lpDosTask = MZ_Current();
 311     RMCB *CurrRMCB;
 312     int alloc = 0, already = 0;
 313     BYTE *code;
 314
 315     GlobalUnlock16( GetCurrentTask() );
 316
 317     TRACE("EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
 318                  EAX_reg(context), EBX_reg(context), ECX_reg(context), EDX_reg(context) );
 319     TRACE("ESI=%08lx EDI=%08lx ES=%04lx DS=%04lx CS:IP=%04lx:%04x, %d WORD arguments, %s\n",
 320                  ESI_reg(context), EDI_reg(context), ES_reg(context), DS_reg(context),
 321                  CS_reg(context), LOWORD(EIP_reg(context)), args, iret?"IRET":"FAR" );
 322
 323 callrmproc_again:
 324
 325 /* there might be some code that just jumps to RMCBs or the like,
 326    in which case following the jumps here might get us to a shortcut */
 327     code = CTX_SEG_OFF_TO_LIN(context, CS_reg(context), EIP_reg(context));
 328     switch (*code) {
 329     case 0xe9: /* JMP NEAR */
 330       EIP_reg(context) += 3 + *(WORD *)(code+1);
 331       /* yeah, I know these gotos don't look good... */
 332       goto callrmproc_again;
 333     case 0xea: /* JMP FAR */
 334       EIP_reg(context) = *(WORD *)(code+1);
 335       CS_reg(context) = *(WORD *)(code+3);
 336       /* ...but since the label is there anyway... */
 337       goto callrmproc_again;
 338     case 0xeb: /* JMP SHORT */
 339       EIP_reg(context) += 2 + *(signed char *)(code+1);
 340       /* ...because of other gotos below, so... */
 341       goto callrmproc_again;
 342     }
 343
 344 /* shortcut for chaining to internal interrupt handlers */
 345     if ((CS_reg(context) == 0xF000) && iret) {
 346         return INT_RealModeInterrupt( LOWORD(EIP_reg(context))/4, context);
 347     }
 348
 349 /* shortcut for RMCBs */
 350     CurrRMCB = FirstRMCB;
 351
 352     while (CurrRMCB && (HIWORD(CurrRMCB->address) != CS_reg(context)))
 353         CurrRMCB = CurrRMCB->next;
 354
 355     if (!(CurrRMCB || lpDosTask)) {
 356 #ifdef MZ_SUPPORTED
 357         FIXME("DPMI real-mode call using DOS VM task system, not fully tested!\n");
 358         TRACE("creating VM86 task\n");
 359         if (!MZ_InitTask( lpDosTask = MZ_AllocDPMITask() )) {
 360             ERR("could not setup VM86 task\n");
 361             return 1;
 362         }
 363 #else
 364         ERR("Actual real-mode calls not supported on this architecture!\n");
 365         return 1;
 366 #endif
 367     }
 368     if (!already) {
 369         if (!SS_reg(context)) {
 370             alloc = 1; /* allocate default stack */
 371             stack16 = addr = DOSMEM_GetBlock( 64, (UINT16 *)&(SS_reg(context)) );
 372             ESP_reg(context) = 64-2;
 373             stack16 += 32-1;
 374             if (!addr) {
 375                 ERR("could not allocate default stack\n");
 376                 return 1;
 377             }
 378         } else {
 379             stack16 = CTX_SEG_OFF_TO_LIN(context, SS_reg(context), ESP_reg(context));
 380         }
 381         ESP_reg(context) -= (args + (iret?1:0)) * sizeof(WORD);
 382         stack16 -= args;
 383         if (args) memcpy(stack16, stack, args*sizeof(WORD) );
 384         /* push flags if iret */
 385         if (iret) {
 386             stack16--; args++;
 387             *stack16 = LOWORD(EFL_reg(context));
 388         }
 389         /* push return address (return to interrupt wrapper) */
 390         *(--stack16) = DPMI_wrap_seg;
 391         *(--stack16) = 0;
 392         /* adjust stack */
 393         ESP_reg(context) -= 2*sizeof(WORD);
 394         already = 1;
 395     }
 396
 397     if (CurrRMCB) {
 398         /* RMCB call, invoke protected-mode handler directly */
 399         DPMI_CallRMCBProc(context, CurrRMCB, lpDosTask ? lpDosTask->dpmi_flag : 0);
 400         /* check if we returned to where we thought we would */
 401         if ((CS_reg(context) != DPMI_wrap_seg) ||
 402             (LOWORD(EIP_reg(context)) != 0)) {
 403             /* we need to continue at different address in real-mode space,
 404                so we need to set it all up for real mode again */
 405             goto callrmproc_again;
 406         }
 407     } else {
 408 #ifdef MZ_SUPPORTED
 409         TRACE("entering real mode...\n");
 410         DOSVM_Enter( context );
 411         TRACE("returned from real-mode call\n");
 412 #else
 413         /* we should never get here, but... */
 414         ERR("cannot perform real-mode call\n");
 415 #endif
 416     }
 417     if (alloc) DOSMEM_FreeBlock( addr );
 418     return 0;
 419 }
 420
 421
 422 /**********************************************************************
 423  *          CallRMInt
 424  */
 425 static void CallRMInt( CONTEXT86 *context )
 426 {
 427     CONTEXT86 realmode_ctx;
 428     FARPROC16 rm_int = INT_GetRMHandler( BL_reg(context) );
 429     REALMODECALL *call = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(context),
 430                                                           DI_reg(context) );
 431     INT_GetRealModeContext( call, &realmode_ctx );
 432
 433     /* we need to check if a real-mode program has hooked the interrupt */
 434     if (HIWORD(rm_int)!=0xF000) {
 435         /* yup, which means we need to switch to real mode... */
 436         CS_reg(&realmode_ctx) = HIWORD(rm_int);
 437         EIP_reg(&realmode_ctx) = LOWORD(rm_int);
 438         if (DPMI_CallRMProc( &realmode_ctx, NULL, 0, TRUE))
 439           SET_CFLAG(context);
 440     } else {
 441         RESET_CFLAG(context);
 442         /* use the IP we have instead of BL_reg, in case some apps
 443            decide to move interrupts around for whatever reason... */
 444         if (INT_RealModeInterrupt( LOWORD(rm_int)/4, &realmode_ctx ))
 445           SET_CFLAG(context);
 446         if (EFL_reg(context)&1) {
 447           FIXME("%02x: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
 448                 BL_reg(context), EAX_reg(&realmode_ctx), EBX_reg(&realmode_ctx),
 449                 ECX_reg(&realmode_ctx), EDX_reg(&realmode_ctx));
 450           FIXME("      ESI=%08lx EDI=%08lx DS=%04lx ES=%04lx\n",
 451                 ESI_reg(&realmode_ctx), EDI_reg(&realmode_ctx),
 452                 DS_reg(&realmode_ctx), ES_reg(&realmode_ctx) );
 453         }
 454     }
 455     INT_SetRealModeContext( call, &realmode_ctx );
 456 }
 457
 458
 459 static void CallRMProc( CONTEXT86 *context, int iret )
 460 {
 461     REALMODECALL *p = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(context), DI_reg(context) );
 462     CONTEXT86 context16;
 463
 464     TRACE("RealModeCall: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
 465         p->eax, p->ebx, p->ecx, p->edx);
 466     TRACE("              ESI=%08lx EDI=%08lx ES=%04x DS=%04x CS:IP=%04x:%04x, %d WORD arguments, %s\n",
 467         p->esi, p->edi, p->es, p->ds, p->cs, p->ip, CX_reg(context), iret?"IRET":"FAR" );
 468
 469     if (!(p->cs) && !(p->ip)) { /* remove this check
 470                                    if Int21/6501 case map function
 471                                    has been implemented */
 472         SET_CFLAG(context);
 473         return;
 474     }
 475     INT_GetRealModeContext(p, &context16);
 476     DPMI_CallRMProc( &context16, ((LPWORD)PTR_SEG_OFF_TO_LIN(SS_reg(context), LOWORD(ESP_reg(context))))+3,
 477                      CX_reg(context), iret );
 478     INT_SetRealModeContext(p, &context16);
 479 }
 480
 481
 482 static RMCB *DPMI_AllocRMCB( void )
 483 {
 484     RMCB *NewRMCB = HeapAlloc(GetProcessHeap(), 0, sizeof(RMCB));
 485     UINT16 uParagraph;
 486
 487     if (NewRMCB)
 488     {
 489         LPVOID RMCBmem = DOSMEM_GetBlock(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         NewRMCB->address = MAKELONG(0, uParagraph);
 499         NewRMCB->next = FirstRMCB;
 500         FirstRMCB = NewRMCB;
 501     }
 502     return NewRMCB;
 503 }
 504
 505
 506 static void AllocRMCB( CONTEXT86 *context )
 507 {
 508     RMCB *NewRMCB = DPMI_AllocRMCB();
 509
 510     TRACE("Function to call: %04x:%04x\n", (WORD)DS_reg(context), SI_reg(context) );
 511
 512     if (NewRMCB)
 513     {
 514         /* FIXME: if 32-bit DPMI client, use ESI and EDI */
 515         NewRMCB->proc_ofs = SI_reg(context);
 516         NewRMCB->proc_sel = DS_reg(context);
 517         NewRMCB->regs_ofs = DI_reg(context);
 518         NewRMCB->regs_sel = ES_reg(context);
 519         SET_LOWORD( ECX_reg(context), HIWORD(NewRMCB->address) );
 520         SET_LOWORD( EDX_reg(context), LOWORD(NewRMCB->address) );
 521     }
 522     else
 523     {
 524         SET_LOWORD( EAX_reg(context), 0x8015 ); /* callback unavailable */
 525         SET_CFLAG(context);
 526     }
 527 }
 528
 529
 530 FARPROC16 WINAPI DPMI_AllocInternalRMCB( RMCBPROC proc )
 531 {
 532     RMCB *NewRMCB = DPMI_AllocRMCB();
 533
 534     if (NewRMCB) {
 535         NewRMCB->proc_ofs = (DWORD)proc;
 536         NewRMCB->proc_sel = 0;
 537         NewRMCB->regs_ofs = 0;
 538         NewRMCB->regs_sel = 0;
 539         return (FARPROC16)(NewRMCB->address);
 540     }
 541     return NULL;
 542 }
 543
 544
 545 static int DPMI_FreeRMCB( DWORD address )
 546 {
 547     RMCB *CurrRMCB = FirstRMCB;
 548     RMCB *PrevRMCB = NULL;
 549
 550     while (CurrRMCB && (CurrRMCB->address != address))
 551     {
 552         PrevRMCB = CurrRMCB;
 553         CurrRMCB = CurrRMCB->next;
 554     }
 555     if (CurrRMCB)
 556     {
 557         if (PrevRMCB)
 558         PrevRMCB->next = CurrRMCB->next;
 559             else
 560         FirstRMCB = CurrRMCB->next;
 561         DOSMEM_FreeBlock(DOSMEM_MapRealToLinear(CurrRMCB->address));
 562         HeapFree(GetProcessHeap(), 0, CurrRMCB);
 563         return 0;
 564     }
 565     return 1;
 566 }
 567
 568
 569 static void FreeRMCB( CONTEXT86 *context )
 570 {
 571     FIXME("callback address: %04x:%04x\n",
 572           CX_reg(context), DX_reg(context));
 573
 574     if (DPMI_FreeRMCB(MAKELONG(DX_reg(context), CX_reg(context)))) {
 575         SET_LOWORD( EAX_reg(context), 0x8024 ); /* invalid callback address */
 576         SET_CFLAG(context);
 577     }
 578 }
 579
 580
 581 void WINAPI DPMI_FreeInternalRMCB( FARPROC16 proc )
 582 {
 583     DPMI_FreeRMCB( (DWORD)proc );
 584 }
 585
 586
 587 #ifdef MZ_SUPPORTED
 588 /* (see loader/dos/module.c, function MZ_InitDPMI) */
 589
 590 static void StartPM( CONTEXT86 *context, LPDOSTASK lpDosTask )
 591 {
 592     char *base = DOSMEM_MemoryBase();
 593     UINT16 cs, ss, ds, es;
 594     CONTEXT86 pm_ctx;
 595     DWORD psp_ofs = (DWORD)(lpDosTask->psp_seg<<4);
 596     PDB16 *psp = (PDB16 *)(base + psp_ofs);
 597     HANDLE16 env_seg = psp->environment;
 598     int is32;
 599
 600     RESET_CFLAG(context);
 601     lpDosTask->dpmi_flag = AX_reg(context);
 602     is32 = lpDosTask->dpmi_flag & 1;
 603 /* our mode switch wrapper have placed the desired CS into DX */
 604     cs = SELECTOR_AllocBlock( base + (DWORD)(DX_reg(context)<<4), 0x10000, SEGMENT_CODE, FALSE, FALSE );
 605 /* due to a flaw in some CPUs (at least mine), it is best to mark stack segments as 32-bit if they
 606    can be used in 32-bit code. Otherwise, these CPUs may not set the high word of esp during a
 607    ring transition (from kernel code) to the 16-bit stack, and this causes trouble if executing
 608    32-bit code using this stack. */
 609     ss = SELECTOR_AllocBlock( base + (DWORD)(SS_reg(context)<<4), 0x10000, SEGMENT_DATA, is32, FALSE );
 610 /* do the same for the data segments, just in case */
 611     if (DS_reg(context) == SS_reg(context)) ds = ss;
 612     else ds = SELECTOR_AllocBlock( base + (DWORD)(DS_reg(context)<<4), 0x10000, SEGMENT_DATA, is32, FALSE );
 613     es = SELECTOR_AllocBlock( base + psp_ofs, 0x100, SEGMENT_DATA, is32, FALSE );
 614 /* convert environment pointer, as the spec says, but we're a bit lazy about the size here... */
 615     psp->environment = SELECTOR_AllocBlock( base + (DWORD)(env_seg<<4),
 616                                             0x10000, SEGMENT_DATA, FALSE, FALSE );
 617
 618     pm_ctx = *context;
 619     CS_reg(&pm_ctx) = lpDosTask->dpmi_sel;
 620 /* our mode switch wrapper expects the new CS in DX, and the new SS in AX */
 621     EAX_reg(&pm_ctx) = ss;
 622     EDX_reg(&pm_ctx) = cs;
 623     DS_reg(&pm_ctx) = ds;
 624     ES_reg(&pm_ctx) = es;
 625     FS_reg(&pm_ctx) = 0;
 626     GS_reg(&pm_ctx) = 0;
 627
 628     TRACE("DOS program is now entering protected mode\n");
 629     Callbacks->CallRegisterShortProc(&pm_ctx, 0);
 630
 631     /* in the current state of affairs, we won't ever actually return here... */
 632     /* we should have int21/ah=4c do it someday, though... */
 633
 634     SELECTOR_FreeBlock(psp->environment, 1);
 635     psp->environment = env_seg;
 636     SELECTOR_FreeBlock(es, 1);
 637     if (ds != ss) SELECTOR_FreeBlock(ds, 1);
 638     SELECTOR_FreeBlock(ss, 1);
 639     SELECTOR_FreeBlock(cs, 1);
 640 }
 641
 642 /* DPMI Raw Mode Switch handler */
 643
 644 #if 0
 645 void WINAPI DPMI_RawModeSwitch( SIGCONTEXT *context )
 646 {
 647   LPDOSTASK lpDosTask = MZ_Current();
 648   CONTEXT86 rm_ctx;
 649   int ret;
 650
 651   if (!lpDosTask) {
 652     /* we could probably start a DPMI-only dosmod task here, but I doubt
 653        anything other than real DOS apps want to call raw mode switch */
 654     ERR("attempting raw mode switch without DOS task!\n");
 655     ExitProcess(1);
 656   }
 657   /* initialize real-mode context as per spec */
 658   memset(&rm_ctx, 0, sizeof(rm_ctx));
 659   DS_reg(&rm_ctx) = AX_sig(context);
 660   ES_reg(&rm_ctx) = CX_sig(context);
 661   SS_reg(&rm_ctx) = DX_sig(context);
 662   ESP_reg(&rm_ctx) = EBX_sig(context);
 663   CS_reg(&rm_ctx) = SI_sig(context);
 664   EIP_reg(&rm_ctx) = EDI_sig(context);
 665   EBP_reg(&rm_ctx) = EBP_sig(context);
 666   FS_reg(&rm_ctx) = 0;
 667   GS_reg(&rm_ctx) = 0;
 668   EFL_reg(&rm_ctx) = EFL_sig(context); /* at least we need the IF flag */
 669
 670   /* enter real mode again */
 671   TRACE("re-entering real mode at %04lx:%04lx\n",
 672         CS_reg(&rm_ctx),EIP_reg(&rm_ctx));
 673   ret = DOSVM_Enter( &rm_ctx );
 674   /* when the real-mode stuff call its mode switch address,
 675      DOSVM_Enter will return and we will continue here */
 676
 677   if (ret<0) {
 678     /* if the sync was lost, there's no way to recover */
 679     ExitProcess(1);
 680   }
 681
 682   /* alter protected-mode context as per spec */
 683   DS_sig(context) = AX_reg(&rm_ctx);
 684   ES_sig(context) = CX_reg(&rm_ctx);
 685   SS_sig(context) = DX_reg(&rm_ctx);
 686   ESP_sig(context) = EBX_reg(&rm_ctx);
 687   CS_sig(context) = SI_reg(&rm_ctx);
 688   EIP_sig(context) = EDI_reg(&rm_ctx);
 689   EBP_sig(context) = EBP_reg(&rm_ctx);
 690   FS_sig(context) = 0;
 691   GS_sig(context) = 0;
 692
 693   /* Return to new address and hope that we didn't mess up */
 694   TRACE("re-entering protected mode at %04x:%08lx\n",
 695         CS_sig(context), EIP_sig(context));
 696 }
 697 #endif
 698
 699 #else
 700 #if 0
 701 void WINAPI DPMI_RawModeSwitch( SIGCONTEXT *context )
 702 {
 703   ERR("don't even think about DPMI raw mode switch without DOS support!\n");
 704   ExitProcess(1);
 705 }
 706 #endif
 707 #endif
 708
 709 #define DOS_APP_ISDOS(addr,base) ((addr) < 0x110000)
 710 #define DOS_WINE_ISDOS(addr,base) (((addr) >= (base)) && ((addr) < (base) + 0x110000))
 711 #define DOS_UC_APPTOWINE(addr,base) ((addr) + (base))
 712 #define DOS_UC_WINETOAPP(addr,base) ((addr) - (base))
 713 #define DOS_APPTOWINE(addr,base) (DOS_APP_ISDOS(addr,base) ? DOS_UC_APPTOWINE(addr,base) : (addr))
 714 #define DOS_WINETOAPP(addr,base) (DOS_WINE_ISDOS(addr,base) ? DOS_UC_WINETOAPP(addr,base) : (addr))
 715 #define DOS_BADLIMIT(addr,base,limit) \
 716   ((limit == 0xffffffff) || /* disallow "fat DS" for now */ \
 717    (DOS_WINE_ISDOS(addr,base) && \
 718     ((addr) + (limit) > (base) + 0x110000)))
 719
 720 /**********************************************************************
 721  *          INT_Int31Handler
 722  *
 723  * Handler for int 31h (DPMI).
 724  */
 725
 726 void WINAPI INT_Int31Handler( CONTEXT86 *context )
 727 {
 728     /*
 729      * Note: For Win32s processes, the whole linear address space is
 730      *       shifted by 0x10000 relative to the OS linear address space.
 731      *       See the comment in msdos/vxd.c.
 732      */
 733     DWORD offset = W32S_APPLICATION() ? W32S_OFFSET : 0;
 734
 735     DWORD dw;
 736     BYTE *ptr;
 737
 738     LPDOSTASK lpDosTask = MZ_Current();
 739
 740 #ifdef MZ_SUPPORTED
 741     if (ISV86(context) && lpDosTask) {
 742         /* Called from real mode, check if it's our wrapper */
 743         TRACE("called from real mode\n");
 744         if (CS_reg(context)==lpDosTask->dpmi_seg) {
 745             /* This is the protected mode switch */
 746             StartPM(context,lpDosTask);
 747             return;
 748         } else
 749         if (CS_reg(context)==lpDosTask->xms_seg) {
 750             /* This is the XMS driver entry point */
 751             XMS_Handler(context);
 752             return;
 753         } else
 754         {
 755             /* Check for RMCB */
 756             RMCB *CurrRMCB = FirstRMCB;
 757
 758             while (CurrRMCB && (HIWORD(CurrRMCB->address) != CS_reg(context)))
 759                 CurrRMCB = CurrRMCB->next;
 760
 761             if (CurrRMCB) {
 762                 /* RMCB call, propagate to protected-mode handler */
 763                 DPMI_CallRMCBProc(context, CurrRMCB, lpDosTask->dpmi_flag);
 764                 return;
 765             }
 766         }
 767     }
 768 #endif
 769
 770     RESET_CFLAG(context);
 771     switch(AX_reg(context))
 772     {
 773     case 0x0000:  /* Allocate LDT descriptors */
 774         TRACE("allocate LDT descriptors (%d)\n",CX_reg(context));
 775         if (!(EAX_reg(context) = AllocSelectorArray16( CX_reg(context) )))
 776         {
 777             TRACE("failed\n");
 778             EAX_reg(context) = 0x8011;  /* descriptor unavailable */
 779             SET_CFLAG(context);
 780         }
 781         TRACE("success, array starts at 0x%04x\n",AX_reg(context));
 782         break;
 783
 784     case 0x0001:  /* Free LDT descriptor */
 785         TRACE("free LDT descriptor (0x%04x)\n",BX_reg(context));
 786         if (FreeSelector16( BX_reg(context) ))
 787         {
 788             EAX_reg(context) = 0x8022;  /* invalid selector */
 789             SET_CFLAG(context);
 790         }
 791         else
 792         {
 793             /* If a segment register contains the selector being freed, */
 794             /* set it to zero. */
 795             if (!((DS_reg(context)^BX_reg(context)) & ~3)) DS_reg(context) = 0;
 796             if (!((ES_reg(context)^BX_reg(context)) & ~3)) ES_reg(context) = 0;
 797             if (!((FS_reg(context)^BX_reg(context)) & ~3)) FS_reg(context) = 0;
 798             if (!((GS_reg(context)^BX_reg(context)) & ~3)) GS_reg(context) = 0;
 799         }
 800         break;
 801
 802     case 0x0002:  /* Real mode segment to descriptor */
 803         TRACE("real mode segment to descriptor (0x%04x)\n",BX_reg(context));
 804         {
 805             WORD entryPoint = 0;  /* KERNEL entry point for descriptor */
 806             switch(BX_reg(context))
 807             {
 808             case 0x0000: entryPoint = 183; break;  /* __0000H */
 809             case 0x0040: entryPoint = 193; break;  /* __0040H */
 810             case 0xa000: entryPoint = 174; break;  /* __A000H */
 811             case 0xb000: entryPoint = 181; break;  /* __B000H */
 812             case 0xb800: entryPoint = 182; break;  /* __B800H */
 813             case 0xc000: entryPoint = 195; break;  /* __C000H */
 814             case 0xd000: entryPoint = 179; break;  /* __D000H */
 815             case 0xe000: entryPoint = 190; break;  /* __E000H */
 816             case 0xf000: entryPoint = 194; break;  /* __F000H */
 817             default:
 818                 EAX_reg(context) = DOSMEM_AllocSelector(BX_reg(context));
 819                 break;
 820             }
 821             if (entryPoint)
 822                 EAX_reg(context) = LOWORD(NE_GetEntryPoint( GetModuleHandle16( "KERNEL" ),
 823                                                             entryPoint ));
 824         }
 825         break;
 826
 827     case 0x0003:  /* Get next selector increment */
 828         TRACE("get selector increment (__AHINCR)\n");
 829         EAX_reg(context) = __AHINCR;
 830         break;
 831
 832     case 0x0004:  /* Lock selector (not supported) */
 833         FIXME("lock selector not supported\n");
 834         EAX_reg(context) = 0;  /* FIXME: is this a correct return value? */
 835         break;
 836
 837     case 0x0005:  /* Unlock selector (not supported) */
 838         FIXME("unlock selector not supported\n");
 839         EAX_reg(context) = 0;  /* FIXME: is this a correct return value? */
 840         break;
 841
 842     case 0x0006:  /* Get selector base address */
 843         TRACE("get selector base address (0x%04x)\n",BX_reg(context));
 844         if (!(dw = GetSelectorBase( BX_reg(context) )))
 845         {
 846             EAX_reg(context) = 0x8022;  /* invalid selector */
 847             SET_CFLAG(context);
 848         }
 849         else
 850         {
 851 #ifdef MZ_SUPPORTED
 852             if (lpDosTask) {
 853                 DWORD base = (DWORD)DOSMEM_MemoryBase();
 854                 dw = DOS_WINETOAPP(dw, base);
 855             }
 856 #endif
 857             CX_reg(context) = HIWORD(W32S_WINE2APP(dw, offset));
 858             DX_reg(context) = LOWORD(W32S_WINE2APP(dw, offset));
 859         }
 860         break;
 861
 862     case 0x0007:  /* Set selector base address */
 863         TRACE("set selector base address (0x%04x,0x%08lx)\n",
 864                      BX_reg(context),
 865                      W32S_APP2WINE(MAKELONG(DX_reg(context),CX_reg(context)), offset));
 866         dw = W32S_APP2WINE(MAKELONG(DX_reg(context), CX_reg(context)), offset);
 867 #ifdef MZ_SUPPORTED
 868         if (lpDosTask) {
 869             DWORD base = (DWORD)DOSMEM_MemoryBase();
 870             dw = DOS_APPTOWINE(dw, base);
 871         }
 872 #endif
 873         SetSelectorBase(BX_reg(context), dw);
 874         break;
 875
 876     case 0x0008:  /* Set selector limit */
 877         TRACE("set selector limit (0x%04x,0x%08lx)\n",BX_reg(context),MAKELONG(DX_reg(context),CX_reg(context)));
 878         dw = MAKELONG( DX_reg(context), CX_reg(context) );
 879 #ifdef MZ_SUPPORTED
 880         if (lpDosTask) {
 881             DWORD base = (DWORD)DOSMEM_MemoryBase();
 882             DWORD sbase = GetSelectorBase( BX_reg(context) );
 883             if (!sbase) {
 884                 /* the app has set the limit without setting the base,
 885                  * it must be relying on that the default should be DOS space;
 886                  * so set the base address now */
 887                 SetSelectorBase( BX_reg(context), sbase = base );
 888                 if (dw == 0xffffffff) {
 889                     /* djgpp does this without checking (in _dos_ds setup, crt1.c),
 890                      * so we have to override the limit here */
 891                     dw = 0x110000;
 892                 }
 893             }
 894             if (DOS_BADLIMIT(sbase, base, dw)) {
 895                 AX_reg(context) = 0x8021;  /* invalid value */
 896                 SET_CFLAG(context);
 897                 break;
 898             }
 899         }
 900 #endif
 901         SetSelectorLimit16( BX_reg(context), dw );
 902         break;
 903
 904     case 0x0009:  /* Set selector access rights */
 905         TRACE("set selector access rights(0x%04x,0x%04x)\n",BX_reg(context),CX_reg(context));
 906         SelectorAccessRights16( BX_reg(context), 1, CX_reg(context) );
 907         break;
 908
 909     case 0x000a:  /* Allocate selector alias */
 910         TRACE("allocate selector alias (0x%04x)\n",BX_reg(context));
 911         if (!(AX_reg(context) = AllocCStoDSAlias16( BX_reg(context) )))
 912         {
 913             AX_reg(context) = 0x8011;  /* descriptor unavailable */
 914             SET_CFLAG(context);
 915         }
 916         break;
 917
 918     case 0x000b:  /* Get descriptor */
 919         TRACE("get descriptor (0x%04x)\n",BX_reg(context));
 920         {
 921             ldt_entry entry;
 922             LDT_GetEntry( SELECTOR_TO_ENTRY( BX_reg(context) ), &entry );
 923 #ifdef MZ_SUPPORTED
 924             if (lpDosTask) {
 925                 DWORD base = (DWORD)DOSMEM_MemoryBase();
 926                 entry.base = DOS_WINETOAPP(entry.base, base);
 927             }
 928 #endif
 929             entry.base = W32S_WINE2APP(entry.base, offset);
 930
 931             /* FIXME: should use ES:EDI for 32-bit clients */
 932             LDT_EntryToBytes( PTR_SEG_OFF_TO_LIN( ES_reg(context),
 933                                                   DI_reg(context) ), &entry );
 934         }
 935         break;
 936
 937     case 0x000c:  /* Set descriptor */
 938         TRACE("set descriptor (0x%04x)\n",BX_reg(context));
 939         {
 940             ldt_entry entry;
 941             LDT_BytesToEntry( PTR_SEG_OFF_TO_LIN( ES_reg(context),
 942                                                   DI_reg(context) ), &entry );
 943             entry.base = W32S_APP2WINE(entry.base, offset);
 944 #ifdef MZ_SUPPORTED
 945             if (lpDosTask) {
 946                 DWORD base = (DWORD)DOSMEM_MemoryBase();
 947                 entry.base = DOS_APPTOWINE(entry.base, base);
 948                 if (DOS_BADLIMIT(entry.base, base, entry.limit)) {
 949                     AX_reg(context) = 0x8021;  /* invalid value */
 950                     SET_CFLAG(context);
 951                     break;
 952                 }
 953             }
 954 #endif
 955
 956             LDT_SetEntry( SELECTOR_TO_ENTRY( BX_reg(context) ), &entry );
 957         }
 958         break;
 959
 960     case 0x000d:  /* Allocate specific LDT descriptor */
 961         FIXME("allocate descriptor (0x%04x), stub!\n",BX_reg(context));
 962         AX_reg(context) = 0x8011; /* descriptor unavailable */
 963         SET_CFLAG(context);
 964         break;
 965     case 0x0100:  /* Allocate DOS memory block */
 966         TRACE("allocate DOS memory block (0x%x paragraphs)\n",BX_reg(context));
 967         dw = GlobalDOSAlloc16((DWORD)BX_reg(context)<<4);
 968         if (dw) {
 969             AX_reg(context) = HIWORD(dw);
 970             DX_reg(context) = LOWORD(dw);
 971         } else {
 972             AX_reg(context) = 0x0008; /* insufficient memory */
 973             BX_reg(context) = DOSMEM_Available()>>4;
 974             SET_CFLAG(context);
 975         }
 976         break;
 977     case 0x0101:  /* Free DOS memory block */
 978         TRACE("free DOS memory block (0x%04x)\n",DX_reg(context));
 979         dw = GlobalDOSFree16(DX_reg(context));
 980         if (!dw) {
 981             AX_reg(context) = 0x0009; /* memory block address invalid */
 982             SET_CFLAG(context);
 983         }
 984         break;
 985     case 0x0200: /* get real mode interrupt vector */
 986         FIXME("get realmode interupt vector(0x%02x) unimplemented.\n",
 987               BL_reg(context));
 988         SET_CFLAG(context);
 989         break;
 990     case 0x0201: /* set real mode interrupt vector */
 991         FIXME("set realmode interupt vector(0x%02x,0x%04x:0x%04x) unimplemented\n", BL_reg(context),CX_reg(context),DX_reg(context));
 992         SET_CFLAG(context);
 993         break;
 994     case 0x0204:  /* Get protected mode interrupt vector */
 995         TRACE("get protected mode interrupt handler (0x%02x), stub!\n",BL_reg(context));
 996         dw = (DWORD)INT_GetPMHandler( BL_reg(context) );
 997         CX_reg(context) = HIWORD(dw);
 998         DX_reg(context) = LOWORD(dw);
 999         break;
1000
1001     case 0x0205:  /* Set protected mode interrupt vector */
1002         TRACE("set protected mode interrupt handler (0x%02x,%p), stub!\n",
1003             BL_reg(context),PTR_SEG_OFF_TO_LIN(CX_reg(context),DX_reg(context)));
1004         INT_SetPMHandler( BL_reg(context),
1005                           (FARPROC16)PTR_SEG_OFF_TO_SEGPTR( CX_reg(context),
1006                                                             DX_reg(context) ));
1007         break;
1008
1009     case 0x0300:  /* Simulate real mode interrupt */
1010         CallRMInt( context );
1011         break;
1012
1013     case 0x0301:  /* Call real mode procedure with far return */
1014         CallRMProc( context, FALSE );
1015         break;
1016
1017     case 0x0302:  /* Call real mode procedure with interrupt return */
1018         CallRMProc( context, TRUE );
1019         break;
1020
1021     case 0x0303:  /* Allocate Real Mode Callback Address */
1022         AllocRMCB( context );
1023         break;
1024
1025     case 0x0304:  /* Free Real Mode Callback Address */
1026         FreeRMCB( context );
1027         break;
1028
1029     case 0x0305:  /* Get State Save/Restore Addresses */
1030         TRACE("get state save/restore addresses\n");
1031         /* we probably won't need this kind of state saving */
1032         AX_reg(context) = 0;
1033         /* real mode: just point to the lret */
1034         BX_reg(context) = DPMI_wrap_seg;
1035         ECX_reg(context) = 2;
1036         /* protected mode: don't have any handler yet... */
1037         FIXME("no protected-mode dummy state save/restore handler yet\n");
1038         SI_reg(context) = 0;
1039         EDI_reg(context) = 0;
1040         break;
1041
1042     case 0x0306:  /* Get Raw Mode Switch Addresses */
1043         TRACE("get raw mode switch addresses\n");
1044         if (lpDosTask) {
1045           /* real mode, point to standard DPMI return wrapper */
1046           BX_reg(context) = DPMI_wrap_seg;
1047           ECX_reg(context) = 0;
1048           /* protected mode, point to DPMI call wrapper */
1049           SI_reg(context) = lpDosTask->dpmi_sel;
1050           EDI_reg(context) = 8; /* offset of the INT 0x31 call */
1051         } else {
1052           ERR("win app attempting to get raw mode switch!\n");
1053           AX_reg(context) = 0x8001; /* unsupported function */
1054           SET_CFLAG(context);
1055         }
1056         break;
1057     case 0x0400:  /* Get DPMI version */
1058         TRACE("get DPMI version\n");
1059         {
1060             SYSTEM_INFO si;
1061
1062             GetSystemInfo(&si);
1063             AX_reg(context) = 0x005a;  /* DPMI version 0.90 */
1064             BX_reg(context) = 0x0005;  /* Flags: 32-bit, virtual memory */
1065             CL_reg(context) = si.wProcessorLevel;
1066             DX_reg(context) = 0x0102;  /* Master/slave interrupt controller base*/
1067             break;
1068         }
1069     case 0x0500:  /* Get free memory information */
1070         TRACE("get free memory information\n");
1071         {
1072             MEMMANINFO mmi;
1073
1074             mmi.dwSize = sizeof(mmi);
1075             MemManInfo16(&mmi);
1076             ptr = (BYTE *)PTR_SEG_OFF_TO_LIN(ES_reg(context),DI_reg(context));
1077             /* the layout is just the same as MEMMANINFO, but without
1078              * the dwSize entry.
1079              */
1080             memcpy(ptr,((char*)&mmi)+4,sizeof(mmi)-4);
1081             break;
1082         }
1083     case 0x0501:  /* Allocate memory block */
1084         TRACE("allocate memory block (%ld)\n",MAKELONG(CX_reg(context),BX_reg(context)));
1085         if (!(ptr = (BYTE *)DPMI_xalloc(MAKELONG(CX_reg(context), BX_reg(context)))))
1086         {
1087             AX_reg(context) = 0x8012;  /* linear memory not available */
1088             SET_CFLAG(context);
1089         } else {
1090             BX_reg(context) = SI_reg(context) = HIWORD(W32S_WINE2APP(ptr, offset));
1091             CX_reg(context) = DI_reg(context) = LOWORD(W32S_WINE2APP(ptr, offset));
1092         }
1093         break;
1094
1095     case 0x0502:  /* Free memory block */
1096         TRACE("free memory block (0x%08lx)\n",
1097                      W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context)), offset));
1098         DPMI_xfree( (void *)W32S_APP2WINE(MAKELONG(DI_reg(context),
1099                                                SI_reg(context)), offset) );
1100         break;
1101
1102     case 0x0503:  /* Resize memory block */
1103         TRACE("resize memory block (0x%08lx,%ld)\n",
1104                      W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context)), offset),
1105                      MAKELONG(CX_reg(context),BX_reg(context)));
1106         if (!(ptr = (BYTE *)DPMI_xrealloc(
1107                 (void *)W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context)), offset),
1108                 MAKELONG(CX_reg(context),BX_reg(context)))))
1109         {
1110             AX_reg(context) = 0x8012;  /* linear memory not available */
1111             SET_CFLAG(context);
1112         } else {
1113             BX_reg(context) = SI_reg(context) = HIWORD(W32S_WINE2APP(ptr, offset));
1114             CX_reg(context) = DI_reg(context) = LOWORD(W32S_WINE2APP(ptr, offset));
1115         }
1116         break;
1117
1118     case 0x0507:  /* Modify page attributes */
1119         FIXME("modify page attributes unimplemented\n");
1120         break;  /* Just ignore it */
1121
1122     case 0x0600:  /* Lock linear region */
1123         FIXME("lock linear region unimplemented\n");
1124         break;  /* Just ignore it */
1125
1126     case 0x0601:  /* Unlock linear region */
1127         FIXME("unlock linear region unimplemented\n");
1128         break;  /* Just ignore it */
1129
1130     case 0x0602:  /* Unlock real-mode region */
1131         FIXME("unlock realmode region unimplemented\n");
1132         break;  /* Just ignore it */
1133
1134     case 0x0603:  /* Lock real-mode region */
1135         FIXME("lock realmode region unimplemented\n");
1136         break;  /* Just ignore it */
1137
1138     case 0x0604:  /* Get page size */
1139         TRACE("get pagesize\n");
1140         BX_reg(context) = 0;
1141         CX_reg(context) = VIRTUAL_GetPageSize();
1142         break;
1143
1144     case 0x0702:  /* Mark page as demand-paging candidate */
1145         FIXME("mark page as demand-paging candidate\n");
1146         break;  /* Just ignore it */
1147
1148     case 0x0703:  /* Discard page contents */
1149         FIXME("discard page contents\n");
1150         break;  /* Just ignore it */
1151
1152      case 0x0800:  /* Physical address mapping */
1153         FIXME("map real to linear (0x%08lx)\n",MAKELONG(CX_reg(context),BX_reg(context)));
1154          if(!(ptr=DOSMEM_MapRealToLinear(MAKELONG(CX_reg(context),BX_reg(context)))))
1155          {
1156              AX_reg(context) = 0x8021;
1157              SET_CFLAG(context);
1158          }
1159          else
1160          {
1161              BX_reg(context) = HIWORD(W32S_WINE2APP(ptr, offset));
1162              CX_reg(context) = LOWORD(W32S_WINE2APP(ptr, offset));
1163              RESET_CFLAG(context);
1164          }
1165          break;
1166
1167     default:
1168         INT_BARF( context, 0x31 );
1169         AX_reg(context) = 0x8001;  /* unsupported function */
1170         SET_CFLAG(context);
1171         break;
1172     }
1173
1174 }