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 "debug.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+=0x10000;
  85                         /* we failed to allocate one in the first round.
  86                          * try non-linear
  87                          */
  88                         if (!xflag && (lastvalloced<oldlastv)) { /* wrapped */
  89                                 FIXME(int31,"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(int31,"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(int31,"realloc of DPMI_xallocd region %p?\n",ptr);
 123                         return NULL;
 124                 }
 125                 if (mbi.State == MEM_FREE) {
 126                         FIXME(int31,"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, CONTEXT *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     (char*)V86BASE(context) = DOSMEM_MemoryBase(0);
 161 }
 162
 163
 164 /**********************************************************************
 165  *          INT_SetRealModeContext
 166  */
 167 static void INT_SetRealModeContext( REALMODECALL *call, CONTEXT *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  = FL_reg(context);
 177     call->ip  = IP_reg(context);
 178     call->sp  = SP_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( CONTEXT *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(int31,"untested!\n");
 207
 208         /* The called proc ends with an IRET, and takes these parameters:
 209          * DS:ESI = pointer to real-mode SS:SP
 210          * ES:EDI = pointer to real-mode call structure
 211          * It returns:
 212          * ES:EDI = pointer to real-mode call structure (may be a copy)
 213          * It is the proc's responsibility to change the return CS:IP in the
 214          * real-mode call structure. */
 215         if (flag & 1) {
 216             int _clobber;
 217             /* 32-bit DPMI client */
 218             __asm__ __volatile__("
 219                  pushl %%es
 220                  pushl %%ds
 221                  pushfl
 222                  movl %5,%%es
 223                  movl %4,%%ds
 224                  lcall %3
 225                  popl %%ds
 226                  movl %%es,%0
 227                  popl %%es
 228              "
 229              : "=g" (es), "=D" (edi), "=S" (_clobber)
 230              : "m" (rmcb->proc_ofs),
 231                "g" (ss), "g" (rmcb->regs_sel),
 232                "S" (ESP_reg(context)), "1" (rmcb->regs_ofs)
 233              : "ecx", "edx", "ebp" );
 234         } else {
 235             /* 16-bit DPMI client */
 236             CONTEXT ctx = *context;
 237             CS_reg(&ctx) = rmcb->proc_sel;
 238             EIP_reg(&ctx) = rmcb->proc_ofs;
 239             DS_reg(&ctx) = ss;
 240             ESI_reg(&ctx) = ESP_reg(context);
 241             ES_reg(&ctx) = rmcb->regs_sel;
 242             EDI_reg(&ctx) = rmcb->regs_ofs;
 243             Callbacks->CallRegisterShortProc(&ctx, 2);
 244             es = ES_reg(&ctx);
 245             edi = EDI_reg(&ctx);
 246         }
 247         UnMapLS(PTR_SEG_OFF_TO_SEGPTR(ss,0));
 248         INT_GetRealModeContext((REALMODECALL*)PTR_SEG_OFF_TO_LIN( es, edi ), context);
 249 #else
 250         ERR(int31,"RMCBs only implemented for i386\n");
 251 #endif
 252     }
 253 }
 254
 255
 256 /**********************************************************************
 257  *          DPMI_CallRMProc
 258  *
 259  * This routine does the hard work of calling a real mode procedure.
 260  */
 261 int DPMI_CallRMProc( CONTEXT *context, LPWORD stack, int args, int iret )
 262 {
 263     LPWORD stack16;
 264 #ifndef MZ_SUPPORTED
 265     THDB *thdb = THREAD_Current();
 266     WORD sel;
 267     SEGPTR seg_addr;
 268 #endif /* !MZ_SUPPORTED */
 269     LPVOID addr = NULL; /* avoid gcc warning */
 270     TDB *pTask = (TDB *)GlobalLock16( GetCurrentTask() );
 271     NE_MODULE *pModule = pTask ? NE_GetPtr( pTask->hModule ) : NULL;
 272     RMCB *CurrRMCB;
 273     int alloc = 0, already = 0;
 274
 275     GlobalUnlock16( GetCurrentTask() );
 276
 277     TRACE(int31, "EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
 278                  EAX_reg(context), EBX_reg(context), ECX_reg(context), EDX_reg(context) );
 279     TRACE(int31, "ESI=%08lx EDI=%08lx ES=%04lx DS=%04lx CS:IP=%04lx:%04x, %d WORD arguments, %s\n",
 280                  ESI_reg(context), EDI_reg(context), ES_reg(context), DS_reg(context),
 281                  CS_reg(context), IP_reg(context), args, iret?"IRET":"FAR" );
 282
 283 callrmproc_again:
 284
 285 /* shortcut for chaining to internal interrupt handlers */
 286     if ((CS_reg(context) == 0xF000) && iret) {
 287         return INT_RealModeInterrupt( IP_reg(context)/4, context);
 288     }
 289
 290 /* shortcut for RMCBs */
 291     CurrRMCB = FirstRMCB;
 292
 293     while (CurrRMCB && (HIWORD(CurrRMCB->address) != CS_reg(context)))
 294         CurrRMCB = CurrRMCB->next;
 295
 296 #ifdef MZ_SUPPORTED
 297     if (!(CurrRMCB || pModule->lpDosTask)) {
 298         FIXME(int31,"DPMI real-mode call using DOS VM task system, not fully tested!\n");
 299         TRACE(int31,"creating VM86 task\n");
 300         if (!MZ_InitTask( MZ_AllocDPMITask( pModule->self ) )) {
 301             ERR(int31,"could not setup VM86 task\n");
 302             return 1;
 303         }
 304     }
 305     if (!already) {
 306         if (!SS_reg(context)) {
 307             alloc = 1; /* allocate default stack */
 308             stack16 = addr = DOSMEM_GetBlock( pModule->self, 64, (UINT16 *)&(SS_reg(context)) );
 309             SP_reg(context) = 64-2;
 310             stack16 += 32-1;
 311             if (!addr) {
 312                 ERR(int31,"could not allocate default stack\n");
 313                 return 1;
 314             }
 315         } else {
 316             stack16 = CTX_SEG_OFF_TO_LIN(context, SS_reg(context), ESP_reg(context));
 317         }
 318         SP_reg(context) -= (args + (iret?1:0)) * sizeof(WORD);
 319 #else
 320     if (!already) {
 321         stack16 = THREAD_STACK16(thdb);
 322 #endif
 323         stack16 -= args;
 324         if (args) memcpy(stack16, stack, args*sizeof(WORD) );
 325         /* push flags if iret */
 326         if (iret) {
 327             stack16--; args++;
 328             *stack16 = FL_reg(context);
 329         }
 330 #ifdef MZ_SUPPORTED
 331         /* push return address (return to interrupt wrapper) */
 332         *(--stack16) = DPMI_wrap_seg;
 333         *(--stack16) = 0;
 334         /* adjust stack */
 335         SP_reg(context) -= 2*sizeof(WORD);
 336 #endif
 337         already = 1;
 338     }
 339
 340     if (CurrRMCB) {
 341         /* RMCB call, invoke protected-mode handler directly */
 342         DPMI_CallRMCBProc(context, CurrRMCB, pModule->lpDosTask?pModule->lpDosTask->dpmi_flag:0);
 343         /* check if we returned to where we thought we would */
 344         if ((CS_reg(context) != DPMI_wrap_seg) ||
 345             (IP_reg(context) != 0)) {
 346             /* we need to continue at different address in real-mode space,
 347                so we need to set it all up for real mode again */
 348             goto callrmproc_again;
 349         }
 350     } else {
 351 #ifdef MZ_SUPPORTED
 352 #if 0 /* this was probably unnecessary */
 353         /* push call address */
 354         *(--stack16) = CS_reg(context);
 355         *(--stack16) = IP_reg(context);
 356         /* adjust stack */
 357         SP_reg(context) -= 2*sizeof(WORD);
 358         /* set initial CS:IP to the wrapper's "lret" */
 359         CS_reg(context) = DPMI_wrap_seg;
 360         IP_reg(context) = 2;
 361 #endif
 362         TRACE(int31,"entering real mode...\n");
 363         DOSVM_Enter( context );
 364         TRACE(int31,"returned from real-mode call\n");
 365 #else
 366         addr = CTX_SEG_OFF_TO_LIN(context, CS_reg(context), EIP_reg(context));
 367         sel = SELECTOR_AllocBlock( addr, 0x10000, SEGMENT_CODE, FALSE, FALSE );
 368         seg_addr = PTR_SEG_OFF_TO_SEGPTR( sel, 0 );
 369
 370         CS_reg(context) = HIWORD(seg_addr);
 371         IP_reg(context) = LOWORD(seg_addr);
 372         EBP_reg(context) = OFFSETOF( thdb->cur_stack )
 373                                    + (WORD)&((STACK16FRAME*)0)->bp;
 374         Callbacks->CallRegisterShortProc(context, args*sizeof(WORD));
 375         UnMapLS(seg_addr);
 376 #endif
 377     }
 378     if (alloc) DOSMEM_FreeBlock( pModule->self, addr );
 379     return 0;
 380 }
 381
 382
 383 /**********************************************************************
 384  *          CallRMInt
 385  */
 386 static void CallRMInt( CONTEXT *context )
 387 {
 388     CONTEXT realmode_ctx;
 389     FARPROC16 rm_int = INT_GetRMHandler( BL_reg(context) );
 390     REALMODECALL *call = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(context),
 391                                                           DI_reg(context) );
 392     INT_GetRealModeContext( call, &realmode_ctx );
 393
 394     /* we need to check if a real-mode program has hooked the interrupt */
 395     if (HIWORD(rm_int)!=0xF000) {
 396         /* yup, which means we need to switch to real mode... */
 397         CS_reg(&realmode_ctx) = HIWORD(rm_int);
 398         EIP_reg(&realmode_ctx) = LOWORD(rm_int);
 399         if (DPMI_CallRMProc( &realmode_ctx, NULL, 0, TRUE))
 400           SET_CFLAG(context);
 401     } else {
 402         RESET_CFLAG(context);
 403         /* use the IP we have instead of BL_reg, in case some apps
 404            decide to move interrupts around for whatever reason... */
 405         if (INT_RealModeInterrupt( LOWORD(rm_int)/4, &realmode_ctx ))
 406           SET_CFLAG(context);
 407         if (EFL_reg(context)&1) {
 408           FIXME(int31,"%02x: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
 409                 BL_reg(context), EAX_reg(&realmode_ctx), EBX_reg(&realmode_ctx),
 410                 ECX_reg(&realmode_ctx), EDX_reg(&realmode_ctx));
 411           FIXME(int31,"      ESI=%08lx EDI=%08lx DS=%04lx ES=%04lx\n",
 412                 ESI_reg(&realmode_ctx), EDI_reg(&realmode_ctx),
 413                 DS_reg(&realmode_ctx), ES_reg(&realmode_ctx) );
 414         }
 415     }
 416     INT_SetRealModeContext( call, &realmode_ctx );
 417 }
 418
 419
 420 static void CallRMProc( CONTEXT *context, int iret )
 421 {
 422     REALMODECALL *p = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(context), DI_reg(context) );
 423     CONTEXT context16;
 424
 425     TRACE(int31, "RealModeCall: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
 426         p->eax, p->ebx, p->ecx, p->edx);
 427     TRACE(int31, "              ESI=%08lx EDI=%08lx ES=%04x DS=%04x CS:IP=%04x:%04x, %d WORD arguments, %s\n",
 428         p->esi, p->edi, p->es, p->ds, p->cs, p->ip, CX_reg(context), iret?"IRET":"FAR" );
 429
 430     if (!(p->cs) && !(p->ip)) { /* remove this check
 431                                    if Int21/6501 case map function
 432                                    has been implemented */
 433         SET_CFLAG(context);
 434         return;
 435     }
 436     INT_GetRealModeContext(p, &context16);
 437     DPMI_CallRMProc( &context16, ((LPWORD)PTR_SEG_OFF_TO_LIN(SS_reg(context), SP_reg(context)))+3,
 438                      CX_reg(context), iret );
 439     INT_SetRealModeContext(p, &context16);
 440 }
 441
 442
 443 static void WINAPI WINE_UNUSED RMCallbackProc( RMCB *rmcb )
 444 {
 445     /* This routine should call DPMI_CallRMCBProc, but we don't have the
 446        register structure available - this is easily fixed by going through
 447        a Win16 register relay instead of calling RMCallbackProc "directly",
 448        but I won't bother at this time. */
 449     FIXME(int31,"not properly supported on your architecture!\n");
 450 }
 451
 452 static RMCB *DPMI_AllocRMCB( void )
 453 {
 454     RMCB *NewRMCB = HeapAlloc(GetProcessHeap(), 0, sizeof(RMCB));
 455     UINT16 uParagraph;
 456
 457     if (NewRMCB)
 458     {
 459 #ifdef MZ_SUPPORTED
 460         LPVOID RMCBmem = DOSMEM_GetBlock(0, 4, &uParagraph);
 461         LPBYTE p = RMCBmem;
 462
 463         *p++ = 0xcd; /* RMCB: */
 464         *p++ = 0x31; /* int $0x31 */
 465 /* it is the called procedure's task to change the return CS:EIP
 466    the DPMI 0.9 spec states that if it doesn't, it will be called again */
 467         *p++ = 0xeb;
 468         *p++ = 0xfc; /* jmp RMCB */
 469 #else
 470         LPVOID RMCBmem = DOSMEM_GetBlock(0, 15, &uParagraph);
 471         LPBYTE p = RMCBmem;
 472
 473         *p++ = 0x68; /* pushl */
 474         *(LPVOID *)p = NewRMCB;
 475         p+=4;
 476         *p++ = 0x9a; /* lcall */
 477         *(FARPROC16 *)p = (FARPROC16)RMCallbackProc; /* FIXME: register relay */
 478         p+=4;
 479         GET_CS(*(WORD *)p);
 480         p+=2;
 481         *p++=0xc3; /* lret (FIXME?) */
 482 #endif
 483         NewRMCB->address = MAKELONG(0, uParagraph);
 484         NewRMCB->next = FirstRMCB;
 485         FirstRMCB = NewRMCB;
 486     }
 487     return NewRMCB;
 488 }
 489
 490
 491 static void AllocRMCB( CONTEXT *context )
 492 {
 493     RMCB *NewRMCB = DPMI_AllocRMCB();
 494
 495     TRACE(int31, "Function to call: %04x:%04x\n", (WORD)DS_reg(context), SI_reg(context) );
 496
 497     if (NewRMCB)
 498     {
 499         /* FIXME: if 32-bit DPMI client, use ESI and EDI */
 500         NewRMCB->proc_ofs = SI_reg(context);
 501         NewRMCB->proc_sel = DS_reg(context);
 502         NewRMCB->regs_ofs = DI_reg(context);
 503         NewRMCB->regs_sel = ES_reg(context);
 504         CX_reg(context) = HIWORD(NewRMCB->address);
 505         DX_reg(context) = LOWORD(NewRMCB->address);
 506     }
 507     else
 508     {
 509         AX_reg(context) = 0x8015; /* callback unavailable */
 510         SET_CFLAG(context);
 511     }
 512 }
 513
 514
 515 FARPROC16 WINAPI DPMI_AllocInternalRMCB( RMCBPROC proc )
 516 {
 517     RMCB *NewRMCB = DPMI_AllocRMCB();
 518
 519     if (NewRMCB) {
 520         NewRMCB->proc_ofs = (DWORD)proc;
 521         NewRMCB->proc_sel = 0;
 522         NewRMCB->regs_ofs = 0;
 523         NewRMCB->regs_sel = 0;
 524         return (FARPROC16)(NewRMCB->address);
 525     }
 526     return NULL;
 527 }
 528
 529
 530 static int DPMI_FreeRMCB( DWORD address )
 531 {
 532     RMCB *CurrRMCB = FirstRMCB;
 533     RMCB *PrevRMCB = NULL;
 534
 535     while (CurrRMCB && (CurrRMCB->address != address))
 536     {
 537         PrevRMCB = CurrRMCB;
 538         CurrRMCB = CurrRMCB->next;
 539     }
 540     if (CurrRMCB)
 541     {
 542         if (PrevRMCB)
 543         PrevRMCB->next = CurrRMCB->next;
 544             else
 545         FirstRMCB = CurrRMCB->next;
 546         DOSMEM_FreeBlock(0, DOSMEM_MapRealToLinear(CurrRMCB->address));
 547         HeapFree(GetProcessHeap(), 0, CurrRMCB);
 548         return 0;
 549     }
 550     return 1;
 551 }
 552
 553
 554 static void FreeRMCB( CONTEXT *context )
 555 {
 556     FIXME(int31, "callback address: %04x:%04x\n",
 557           CX_reg(context), DX_reg(context));
 558
 559     if (DPMI_FreeRMCB(MAKELONG(DX_reg(context), CX_reg(context)))) {
 560         AX_reg(context) = 0x8024; /* invalid callback address */
 561         SET_CFLAG(context);
 562     }
 563 }
 564
 565
 566 void WINAPI DPMI_FreeInternalRMCB( FARPROC16 proc )
 567 {
 568     DPMI_FreeRMCB( (DWORD)proc );
 569 }
 570
 571
 572 #ifdef MZ_SUPPORTED
 573 /* (see loader/dos/module.c, function MZ_InitDPMI) */
 574
 575 static void StartPM( CONTEXT *context, LPDOSTASK lpDosTask )
 576 {
 577     char *base = DOSMEM_MemoryBase(0);
 578     UINT16 cs, ss, ds, es;
 579     CONTEXT pm_ctx;
 580
 581     RESET_CFLAG(context);
 582     lpDosTask->dpmi_flag = AX_reg(context);
 583 /* our mode switch wrapper have placed the desired CS into DX */
 584     cs = SELECTOR_AllocBlock( base + (DWORD)(DX_reg(context)<<4), 0x10000, SEGMENT_CODE, FALSE, FALSE );
 585     ss = SELECTOR_AllocBlock( base + (DWORD)(SS_reg(context)<<4), 0x10000, SEGMENT_DATA, FALSE, FALSE );
 586     ds = SELECTOR_AllocBlock( base + (DWORD)(DS_reg(context)<<4), 0x10000, SEGMENT_DATA, FALSE, FALSE );
 587     es = SELECTOR_AllocBlock( base + (DWORD)(lpDosTask->psp_seg<<4), 0x100, SEGMENT_DATA, FALSE, FALSE );
 588
 589     pm_ctx = *context;
 590     CS_reg(&pm_ctx) = lpDosTask->dpmi_sel;
 591 /* our mode switch wrapper expects the new CS in DX, and the new SS in AX */
 592     AX_reg(&pm_ctx) = ss;
 593     DX_reg(&pm_ctx) = cs;
 594     DS_reg(&pm_ctx) = ds;
 595     ES_reg(&pm_ctx) = es;
 596     FS_reg(&pm_ctx) = 0;
 597     GS_reg(&pm_ctx) = 0;
 598
 599     TRACE(int31,"DOS program is now entering protected mode\n");
 600     Callbacks->CallRegisterShortProc(&pm_ctx, 0);
 601
 602     /* in the current state of affairs, we won't ever actually return here... */
 603
 604     UnMapLS(PTR_SEG_OFF_TO_SEGPTR(es,0));
 605     UnMapLS(PTR_SEG_OFF_TO_SEGPTR(ds,0));
 606     UnMapLS(PTR_SEG_OFF_TO_SEGPTR(ss,0));
 607     UnMapLS(PTR_SEG_OFF_TO_SEGPTR(cs,0));
 608 }
 609 #endif
 610
 611 /**********************************************************************
 612  *          INT_Int31Handler
 613  *
 614  * Handler for int 31h (DPMI).
 615  */
 616
 617 void WINAPI INT_Int31Handler( CONTEXT *context )
 618 {
 619     /*
 620      * Note: For Win32s processes, the whole linear address space is
 621      *       shifted by 0x10000 relative to the OS linear address space.
 622      *       See the comment in msdos/vxd.c.
 623      */
 624     DWORD offset = W32S_APPLICATION() ? W32S_OFFSET : 0;
 625
 626     DWORD dw;
 627     BYTE *ptr;
 628
 629     TDB *pTask = (TDB *)GlobalLock16( GetCurrentTask() );
 630     NE_MODULE *pModule = pTask ? NE_GetPtr( pTask->hModule ) : NULL;
 631
 632     GlobalUnlock16( GetCurrentTask() );
 633
 634 #ifdef MZ_SUPPORTED
 635     if (ISV86(context) && pModule && pModule->lpDosTask) {
 636         /* Called from real mode, check if it's our wrapper */
 637         TRACE(int31,"called from real mode\n");
 638         if (CS_reg(context)==pModule->lpDosTask->dpmi_seg) {
 639             /* This is the protected mode switch */
 640             StartPM(context,pModule->lpDosTask);
 641             return;
 642         } else
 643         if (CS_reg(context)==pModule->lpDosTask->xms_seg) {
 644             /* This is the XMS driver entry point */
 645             XMS_Handler(context);
 646             return;
 647         } else
 648         {
 649             /* Check for RMCB */
 650             RMCB *CurrRMCB = FirstRMCB;
 651
 652             while (CurrRMCB && (HIWORD(CurrRMCB->address) != CS_reg(context)))
 653                 CurrRMCB = CurrRMCB->next;
 654
 655             if (CurrRMCB) {
 656                 /* RMCB call, propagate to protected-mode handler */
 657                 DPMI_CallRMCBProc(context, CurrRMCB, pModule->lpDosTask->dpmi_flag);
 658                 return;
 659             }
 660         }
 661     }
 662 #endif
 663
 664     RESET_CFLAG(context);
 665     switch(AX_reg(context))
 666     {
 667     case 0x0000:  /* Allocate LDT descriptors */
 668         TRACE(int31,"allocate LDT descriptors (%d)\n",CX_reg(context));
 669         if (!(AX_reg(context) = AllocSelectorArray16( CX_reg(context) )))
 670         {
 671             TRACE(int31,"failed\n");
 672             AX_reg(context) = 0x8011;  /* descriptor unavailable */
 673             SET_CFLAG(context);
 674         }
 675         TRACE(int31,"success, array starts at 0x%04x\n",AX_reg(context));
 676         break;
 677
 678     case 0x0001:  /* Free LDT descriptor */
 679         TRACE(int31,"free LDT descriptor (0x%04x)\n",BX_reg(context));
 680         if (FreeSelector16( BX_reg(context) ))
 681         {
 682             AX_reg(context) = 0x8022;  /* invalid selector */
 683             SET_CFLAG(context);
 684         }
 685         else
 686         {
 687             /* If a segment register contains the selector being freed, */
 688             /* set it to zero. */
 689             if (!((DS_reg(context)^BX_reg(context)) & ~3)) DS_reg(context) = 0;
 690             if (!((ES_reg(context)^BX_reg(context)) & ~3)) ES_reg(context) = 0;
 691             if (!((FS_reg(context)^BX_reg(context)) & ~3)) FS_reg(context) = 0;
 692             if (!((GS_reg(context)^BX_reg(context)) & ~3)) GS_reg(context) = 0;
 693         }
 694         break;
 695
 696     case 0x0002:  /* Real mode segment to descriptor */
 697         TRACE(int31,"real mode segment to descriptor (0x%04x)\n",BX_reg(context));
 698         {
 699             WORD entryPoint = 0;  /* KERNEL entry point for descriptor */
 700             switch(BX_reg(context))
 701             {
 702             case 0x0000: entryPoint = 183; break;  /* __0000H */
 703             case 0x0040: entryPoint = 193; break;  /* __0040H */
 704             case 0xa000: entryPoint = 174; break;  /* __A000H */
 705             case 0xb000: entryPoint = 181; break;  /* __B000H */
 706             case 0xb800: entryPoint = 182; break;  /* __B800H */
 707             case 0xc000: entryPoint = 195; break;  /* __C000H */
 708             case 0xd000: entryPoint = 179; break;  /* __D000H */
 709             case 0xe000: entryPoint = 190; break;  /* __E000H */
 710             case 0xf000: entryPoint = 194; break;  /* __F000H */
 711             default:
 712                 AX_reg(context) = DOSMEM_AllocSelector(BX_reg(context));
 713                 break;
 714             }
 715             if (entryPoint)
 716                 AX_reg(context) = LOWORD(NE_GetEntryPoint(
 717                                                  GetModuleHandle16( "KERNEL" ),
 718                                                  entryPoint ));
 719         }
 720         break;
 721
 722     case 0x0003:  /* Get next selector increment */
 723         TRACE(int31,"get selector increment (__AHINCR)\n");
 724         AX_reg(context) = __AHINCR;
 725         break;
 726
 727     case 0x0004:  /* Lock selector (not supported) */
 728         FIXME(int31,"lock selector not supported\n");
 729         AX_reg(context) = 0;  /* FIXME: is this a correct return value? */
 730         break;
 731
 732     case 0x0005:  /* Unlock selector (not supported) */
 733         FIXME(int31,"unlock selector not supported\n");
 734         AX_reg(context) = 0;  /* FIXME: is this a correct return value? */
 735         break;
 736
 737     case 0x0006:  /* Get selector base address */
 738         TRACE(int31,"get selector base address (0x%04x)\n",BX_reg(context));
 739         if (!(dw = GetSelectorBase( BX_reg(context) )))
 740         {
 741             AX_reg(context) = 0x8022;  /* invalid selector */
 742             SET_CFLAG(context);
 743         }
 744         else
 745         {
 746 #ifdef MZ_SUPPORTED
 747             if (pModule && pModule->lpDosTask) {
 748                 DWORD base = (DWORD)DOSMEM_MemoryBase(pModule->self);
 749                 if ((dw >= base) && (dw < base + 0x110000)) dw -= base;
 750             }
 751 #endif
 752             CX_reg(context) = HIWORD(W32S_WINE2APP(dw, offset));
 753             DX_reg(context) = LOWORD(W32S_WINE2APP(dw, offset));
 754         }
 755         break;
 756
 757     case 0x0007:  /* Set selector base address */
 758         TRACE(int31, "set selector base address (0x%04x,0x%08lx)\n",
 759                      BX_reg(context),
 760                      W32S_APP2WINE(MAKELONG(DX_reg(context),CX_reg(context)), offset));
 761         dw = W32S_APP2WINE(MAKELONG(DX_reg(context), CX_reg(context)), offset);
 762 #ifdef MZ_SUPPORTED
 763         /* well, what else could we possibly do? */
 764         if (pModule && pModule->lpDosTask) {
 765             if (dw < 0x110000) dw += (DWORD)DOSMEM_MemoryBase(pModule->self);
 766         }
 767 #endif
 768         SetSelectorBase(BX_reg(context), dw);
 769         break;
 770
 771     case 0x0008:  /* Set selector limit */
 772         TRACE(int31,"set selector limit (0x%04x,0x%08lx)\n",BX_reg(context),MAKELONG(DX_reg(context),CX_reg(context)));
 773         dw = MAKELONG( DX_reg(context), CX_reg(context) );
 774 #ifdef MZ_SUPPORTED
 775         if (pModule && pModule->lpDosTask) {
 776             DWORD base = GetSelectorBase( BX_reg(context) );
 777             if ((dw == 0xffffffff) || ((base < 0x110000) && (base + dw > 0x110000))) {
 778                 AX_reg(context) = 0x8021;  /* invalid value */
 779                 SET_CFLAG(context);
 780                 break;
 781             }
 782         }
 783 #endif
 784         SetSelectorLimit16( BX_reg(context), dw );
 785         break;
 786
 787     case 0x0009:  /* Set selector access rights */
 788         TRACE(int31,"set selector access rights(0x%04x,0x%04x)\n",BX_reg(context),CX_reg(context));
 789         SelectorAccessRights16( BX_reg(context), 1, CX_reg(context) );
 790         break;
 791
 792     case 0x000a:  /* Allocate selector alias */
 793         TRACE(int31,"allocate selector alias (0x%04x)\n",BX_reg(context));
 794         if (!(AX_reg(context) = AllocCStoDSAlias16( BX_reg(context) )))
 795         {
 796             AX_reg(context) = 0x8011;  /* descriptor unavailable */
 797             SET_CFLAG(context);
 798         }
 799         break;
 800
 801     case 0x000b:  /* Get descriptor */
 802         TRACE(int31,"get descriptor (0x%04x)\n",BX_reg(context));
 803         {
 804             ldt_entry entry;
 805             LDT_GetEntry( SELECTOR_TO_ENTRY( BX_reg(context) ), &entry );
 806             entry.base = W32S_WINE2APP(entry.base, offset);
 807
 808             /* FIXME: should use ES:EDI for 32-bit clients */
 809             LDT_EntryToBytes( PTR_SEG_OFF_TO_LIN( ES_reg(context),
 810                                                   DI_reg(context) ), &entry );
 811         }
 812         break;
 813
 814     case 0x000c:  /* Set descriptor */
 815         TRACE(int31,"set descriptor (0x%04x)\n",BX_reg(context));
 816         {
 817             ldt_entry entry;
 818             LDT_BytesToEntry( PTR_SEG_OFF_TO_LIN( ES_reg(context),
 819                                                   DI_reg(context) ), &entry );
 820             entry.base = W32S_APP2WINE(entry.base, offset);
 821
 822             LDT_SetEntry( SELECTOR_TO_ENTRY( BX_reg(context) ), &entry );
 823         }
 824         break;
 825
 826     case 0x000d:  /* Allocate specific LDT descriptor */
 827         FIXME(int31,"allocate descriptor (0x%04x), stub!\n",BX_reg(context));
 828         AX_reg(context) = 0x8011; /* descriptor unavailable */
 829         SET_CFLAG(context);
 830         break;
 831     case 0x0100:  /* Allocate DOS memory block */
 832         TRACE(int31,"allocate DOS memory block (0x%x paragraphs)\n",BX_reg(context));
 833         dw = GlobalDOSAlloc16((DWORD)BX_reg(context)<<4);
 834         if (dw) {
 835             AX_reg(context) = HIWORD(dw);
 836             DX_reg(context) = LOWORD(dw);
 837         } else {
 838             AX_reg(context) = 0x0008; /* insufficient memory */
 839             BX_reg(context) = DOSMEM_Available(0)>>4;
 840             SET_CFLAG(context);
 841         }
 842         break;
 843     case 0x0101:  /* Free DOS memory block */
 844         TRACE(int31,"free DOS memory block (0x%04x)\n",DX_reg(context));
 845         dw = GlobalDOSFree16(DX_reg(context));
 846         if (!dw) {
 847             AX_reg(context) = 0x0009; /* memory block address invalid */
 848             SET_CFLAG(context);
 849         }
 850         break;
 851     case 0x0200: /* get real mode interrupt vector */
 852         FIXME(int31,"get realmode interupt vector(0x%02x) unimplemented.\n",
 853               BL_reg(context));
 854         SET_CFLAG(context);
 855         break;
 856     case 0x0201: /* set real mode interrupt vector */
 857         FIXME(int31, "set realmode interupt vector(0x%02x,0x%04x:0x%04x) unimplemented\n", BL_reg(context),CX_reg(context),DX_reg(context));
 858         SET_CFLAG(context);
 859         break;
 860     case 0x0204:  /* Get protected mode interrupt vector */
 861         TRACE(int31,"get protected mode interrupt handler (0x%02x), stub!\n",BL_reg(context));
 862         dw = (DWORD)INT_GetPMHandler( BL_reg(context) );
 863         CX_reg(context) = HIWORD(dw);
 864         DX_reg(context) = LOWORD(dw);
 865         break;
 866
 867     case 0x0205:  /* Set protected mode interrupt vector */
 868         TRACE(int31,"set protected mode interrupt handler (0x%02x,%p), stub!\n",
 869             BL_reg(context),PTR_SEG_OFF_TO_LIN(CX_reg(context),DX_reg(context)));
 870         INT_SetPMHandler( BL_reg(context),
 871                           (FARPROC16)PTR_SEG_OFF_TO_SEGPTR( CX_reg(context),
 872                                                             DX_reg(context) ));
 873         break;
 874
 875     case 0x0300:  /* Simulate real mode interrupt */
 876         CallRMInt( context );
 877         break;
 878
 879     case 0x0301:  /* Call real mode procedure with far return */
 880         CallRMProc( context, FALSE );
 881         break;
 882
 883     case 0x0302:  /* Call real mode procedure with interrupt return */
 884         CallRMProc( context, TRUE );
 885         break;
 886
 887     case 0x0303:  /* Allocate Real Mode Callback Address */
 888         AllocRMCB( context );
 889         break;
 890
 891     case 0x0304:  /* Free Real Mode Callback Address */
 892         FreeRMCB( context );
 893         break;
 894
 895     case 0x0400:  /* Get DPMI version */
 896         TRACE(int31,"get DPMI version\n");
 897         {
 898             SYSTEM_INFO si;
 899
 900             GetSystemInfo(&si);
 901             AX_reg(context) = 0x005a;  /* DPMI version 0.90 */
 902             BX_reg(context) = 0x0005;  /* Flags: 32-bit, virtual memory */
 903             CL_reg(context) = si.wProcessorLevel;
 904             DX_reg(context) = 0x0102;  /* Master/slave interrupt controller base*/
 905             break;
 906         }
 907     case 0x0500:  /* Get free memory information */
 908         TRACE(int31,"get free memory information\n");
 909         {
 910             MEMMANINFO mmi;
 911
 912             mmi.dwSize = sizeof(mmi);
 913             MemManInfo16(&mmi);
 914             ptr = (BYTE *)PTR_SEG_OFF_TO_LIN(ES_reg(context),DI_reg(context));
 915             /* the layout is just the same as MEMMANINFO, but without
 916              * the dwSize entry.
 917              */
 918             memcpy(ptr,((char*)&mmi)+4,sizeof(mmi)-4);
 919             break;
 920         }
 921     case 0x0501:  /* Allocate memory block */
 922         TRACE(int31,"allocate memory block (%ld)\n",MAKELONG(CX_reg(context),BX_reg(context)));
 923         if (!(ptr = (BYTE *)DPMI_xalloc(MAKELONG(CX_reg(context), BX_reg(context)))))
 924         {
 925             AX_reg(context) = 0x8012;  /* linear memory not available */
 926             SET_CFLAG(context);
 927         } else {
 928             BX_reg(context) = SI_reg(context) = HIWORD(W32S_WINE2APP(ptr, offset));
 929             CX_reg(context) = DI_reg(context) = LOWORD(W32S_WINE2APP(ptr, offset));
 930         }
 931         break;
 932
 933     case 0x0502:  /* Free memory block */
 934         TRACE(int31, "free memory block (0x%08lx)\n",
 935                      W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context)), offset));
 936         DPMI_xfree( (void *)W32S_APP2WINE(MAKELONG(DI_reg(context),
 937                                                SI_reg(context)), offset) );
 938         break;
 939
 940     case 0x0503:  /* Resize memory block */
 941         TRACE(int31, "resize memory block (0x%08lx,%ld)\n",
 942                      W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context)), offset),
 943                      MAKELONG(CX_reg(context),BX_reg(context)));
 944         if (!(ptr = (BYTE *)DPMI_xrealloc(
 945                 (void *)W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context)), offset),
 946                 MAKELONG(CX_reg(context),BX_reg(context)))))
 947         {
 948             AX_reg(context) = 0x8012;  /* linear memory not available */
 949             SET_CFLAG(context);
 950         } else {
 951             BX_reg(context) = SI_reg(context) = HIWORD(W32S_WINE2APP(ptr, offset));
 952             CX_reg(context) = DI_reg(context) = LOWORD(W32S_WINE2APP(ptr, offset));
 953         }
 954         break;
 955
 956     case 0x0507:  /* Modify page attributes */
 957         FIXME(int31,"modify page attributes unimplemented\n");
 958         break;  /* Just ignore it */
 959
 960     case 0x0600:  /* Lock linear region */
 961         FIXME(int31,"lock linear region unimplemented\n");
 962         break;  /* Just ignore it */
 963
 964     case 0x0601:  /* Unlock linear region */
 965         FIXME(int31,"unlock linear region unimplemented\n");
 966         break;  /* Just ignore it */
 967
 968     case 0x0602:  /* Unlock real-mode region */
 969         FIXME(int31,"unlock realmode region unimplemented\n");
 970         break;  /* Just ignore it */
 971
 972     case 0x0603:  /* Lock real-mode region */
 973         FIXME(int31,"lock realmode region unimplemented\n");
 974         break;  /* Just ignore it */
 975
 976     case 0x0604:  /* Get page size */
 977         TRACE(int31,"get pagesize\n");
 978         BX_reg(context) = 0;
 979         CX_reg(context) = VIRTUAL_GetPageSize();
 980         break;
 981
 982     case 0x0702:  /* Mark page as demand-paging candidate */
 983         FIXME(int31,"mark page as demand-paging candidate\n");
 984         break;  /* Just ignore it */
 985
 986     case 0x0703:  /* Discard page contents */
 987         FIXME(int31,"discard page contents\n");
 988         break;  /* Just ignore it */
 989
 990      case 0x0800:  /* Physical address mapping */
 991         FIXME(int31,"map real to linear (0x%08lx)\n",MAKELONG(CX_reg(context),BX_reg(context)));
 992          if(!(ptr=DOSMEM_MapRealToLinear(MAKELONG(CX_reg(context),BX_reg(context)))))
 993          {
 994              AX_reg(context) = 0x8021;
 995              SET_CFLAG(context);
 996          }
 997          else
 998          {
 999              BX_reg(context) = HIWORD(W32S_WINE2APP(ptr, offset));
1000              CX_reg(context) = LOWORD(W32S_WINE2APP(ptr, offset));
1001              RESET_CFLAG(context);
1002          }
1003          break;
1004
1005     default:
1006         INT_BARF( context, 0x31 );
1007         AX_reg(context) = 0x8001;  /* unsupported function */
1008         SET_CFLAG(context);
1009         break;
1010     }
1011
1012 }