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 "windows.h"
  10 #include "heap.h"
  11 #include "global.h"
  12 #include "ldt.h"
  13 #include "module.h"
  14 #include "miscemu.h"
  15 #include "drive.h"
  16 #include "msdos.h"
  17 #include "task.h"
  18 #include "dosexe.h"
  19 #include "toolhelp.h"
  20 #include "debug.h"
  21 #include "selectors.h"
  22 #include "thread.h"
  23 #include "process.h"
  24 #include "stackframe.h"
  25 #include "callback.h"
  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     struct tagRMCB *next;
  60
  61 } RMCB;
  62
  63 static RMCB *FirstRMCB = NULL;
  64
  65 /**********************************************************************
  66  *          DPMI_xalloc
  67  * special virtualalloc, allocates lineary monoton growing memory.
  68  * (the usual VirtualAlloc does not satisfy that restriction)
  69  */
  70 static LPVOID
  71 DPMI_xalloc(int len) {
  72         LPVOID  ret;
  73         LPVOID  oldlastv = lastvalloced;
  74
  75         if (lastvalloced) {
  76                 int     xflag = 0;
  77                 ret = NULL;
  78                 while (!ret) {
  79                         ret=VirtualAlloc(lastvalloced,len,MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
  80                         if (!ret)
  81                                 lastvalloced+=0x10000;
  82                         /* we failed to allocate one in the first round.
  83                          * try non-linear
  84                          */
  85                         if (!xflag && (lastvalloced<oldlastv)) { /* wrapped */
  86                                 FIXME(int31,"failed to allocate lineary growing memory (%d bytes), using non-linear growing...\n",len);
  87                                 xflag++;
  88                         }
  89                         /* if we even fail to allocate something in the next
  90                          * round, return NULL
  91                          */
  92                         if ((xflag==1) && (lastvalloced >= oldlastv))
  93                                 xflag++;
  94                         if ((xflag==2) && (lastvalloced < oldlastv)) {
  95                                 FIXME(int31,"failed to allocate any memory of %d bytes!\n",len);
  96                                 return NULL;
  97                         }
  98                 }
  99         } else
 100                  ret=VirtualAlloc(NULL,len,MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
 101         lastvalloced = (LPVOID)(((DWORD)ret+len+0xffff)&~0xffff);
 102         return ret;
 103 }
 104
 105 static void
 106 DPMI_xfree(LPVOID ptr) {
 107         VirtualFree(ptr,0,MEM_RELEASE);
 108 }
 109
 110 /* FIXME: perhaps we could grow this mapped area... */
 111 static LPVOID
 112 DPMI_xrealloc(LPVOID ptr,int newsize) {
 113         MEMORY_BASIC_INFORMATION        mbi;
 114         LPVOID                          newptr;
 115
 116         newptr = DPMI_xalloc(newsize);
 117         if (ptr) {
 118                 if (!VirtualQuery(ptr,&mbi,sizeof(mbi))) {
 119                         FIXME(int31,"realloc of DPMI_xallocd region %p?\n",ptr);
 120                         return NULL;
 121                 }
 122                 if (mbi.State == MEM_FREE) {
 123                         FIXME(int31,"realloc of DPMI_xallocd region %p?\n",ptr);
 124                         return NULL;
 125                 }
 126                 /* We do not shrink allocated memory. most reallocs
 127                  * only do grows anyway
 128                  */
 129                 if (newsize<=mbi.RegionSize)
 130                         return ptr;
 131                 memcpy(newptr,ptr,mbi.RegionSize);
 132                 DPMI_xfree(ptr);
 133         }
 134         return newptr;
 135 }
 136 /**********************************************************************
 137  *          INT_GetRealModeContext
 138  */
 139 static void INT_GetRealModeContext( REALMODECALL *call, CONTEXT *context )
 140 {
 141     EAX_reg(context) = call->eax;
 142     EBX_reg(context) = call->ebx;
 143     ECX_reg(context) = call->ecx;
 144     EDX_reg(context) = call->edx;
 145     ESI_reg(context) = call->esi;
 146     EDI_reg(context) = call->edi;
 147     EBP_reg(context) = call->ebp;
 148     EFL_reg(context) = call->fl | V86_FLAG;
 149     EIP_reg(context) = call->ip;
 150     ESP_reg(context) = call->sp;
 151     CS_reg(context)  = call->cs;
 152     DS_reg(context)  = call->ds;
 153     ES_reg(context)  = call->es;
 154     FS_reg(context)  = call->fs;
 155     GS_reg(context)  = call->gs;
 156     (char*)V86BASE(context) = DOSMEM_MemoryBase(0);
 157 }
 158
 159
 160 /**********************************************************************
 161  *          INT_SetRealModeContext
 162  */
 163 static void INT_SetRealModeContext( REALMODECALL *call, CONTEXT *context )
 164 {
 165     call->eax = EAX_reg(context);
 166     call->ebx = EBX_reg(context);
 167     call->ecx = ECX_reg(context);
 168     call->edx = EDX_reg(context);
 169     call->esi = ESI_reg(context);
 170     call->edi = EDI_reg(context);
 171     call->ebp = EBP_reg(context);
 172     call->fl  = FL_reg(context);
 173     call->ip  = IP_reg(context);
 174     call->sp  = SP_reg(context);
 175     call->cs  = CS_reg(context);
 176     call->ds  = DS_reg(context);
 177     call->es  = ES_reg(context);
 178     call->fs  = FS_reg(context);
 179     call->gs  = GS_reg(context);
 180 }
 181
 182
 183 /**********************************************************************
 184  *          DPMI_CallRMProc
 185  *
 186  * This routine does the hard work of calling a real mode procedure.
 187  */
 188 int DPMI_CallRMProc( CONTEXT *context, LPWORD stack, int args, int iret )
 189 {
 190     LPWORD stack16;
 191     THDB *thdb = THREAD_Current();
 192     LPVOID addr;
 193     TDB *pTask = (TDB *)GlobalLock16( GetCurrentTask() );
 194     NE_MODULE *pModule = pTask ? NE_GetPtr( pTask->hModule ) : NULL;
 195     int alloc = 0;
 196     WORD sel;
 197     SEGPTR seg_addr;
 198
 199     GlobalUnlock16( GetCurrentTask() );
 200
 201     TRACE(int31, "EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
 202                  EAX_reg(context), EBX_reg(context), ECX_reg(context), EDX_reg(context) );
 203     TRACE(int31, "ESI=%08lx EDI=%08lx ES=%04x DS=%04x CS:IP=%04x:%04x, %d WORD arguments\n",
 204                  ESI_reg(context), EDI_reg(context), ES_reg(context), DS_reg(context),
 205                  CS_reg(context), IP_reg(context), args );
 206
 207 #ifdef MZ_SUPPORTED
 208     FIXME(int31,"DPMI real-mode call using DOS VM task system, not fully tested\n");
 209     if (!pModule->lpDosTask) {
 210         TRACE(int31,"creating VM86 task\n");
 211         if (MZ_InitTask( MZ_AllocDPMITask( pModule->self ) ) < 32) {
 212             ERR(int31,"could not setup VM86 task\n");
 213             return 1;
 214         }
 215     }
 216     if (!SS_reg(context)) {
 217         alloc = 1; /* allocate default stack */
 218         stack16 = addr = DOSMEM_GetBlock( pModule->self, 64, &(SS_reg(context)) );
 219         SP_reg(context) = 64-2;
 220         stack16 += 32-1;
 221         if (!addr) {
 222             ERR(int31,"could not allocate default stack\n");
 223             return 1;
 224         }
 225     } else {
 226         stack16 = CTX_SEG_OFF_TO_LIN(context, SS_reg(context), ESP_reg(context));
 227         addr = NULL; /* avoid gcc warning */
 228     }
 229     SP_reg(context) -= (args + (iret?1:0)) * sizeof(WORD);
 230 #else
 231     stack16 = THREAD_STACK16(thdb);
 232 #endif
 233     stack16 -= args;
 234     if (args) memcpy(stack16, stack, args*sizeof(WORD) );
 235     /* push flags if iret */
 236     if (iret) {
 237         stack16--; args++;
 238         *stack16 = FL_reg(context);
 239     }
 240 #ifdef MZ_SUPPORTED
 241     /* push return address (return to interrupt wrapper) */
 242     *(--stack16) = pModule->lpDosTask->dpmi_seg;
 243     *(--stack16) = pModule->lpDosTask->wrap_ofs;
 244     /* push call address */
 245     *(--stack16) = CS_reg(context);
 246     *(--stack16) = IP_reg(context);
 247     /* adjust stack */
 248     SP_reg(context) -= 4*sizeof(WORD);
 249     /* set initial CS:IP to the wrapper's "lret" */
 250     CS_reg(context) = pModule->lpDosTask->dpmi_seg;
 251     IP_reg(context) = pModule->lpDosTask->call_ofs;
 252     TRACE(int31,"entering real mode...\n");
 253     DOSVM_Enter( context );
 254     TRACE(int31,"returned from real-mode call\n");
 255     if (alloc) DOSMEM_FreeBlock( pModule->self, addr );
 256 #else
 257     addr = CTX_SEG_OFF_TO_LIN(context, CS_reg(context), EIP_reg(context));
 258     sel = SELECTOR_AllocBlock( addr, 0x10000, SEGMENT_CODE, FALSE, FALSE );
 259     seg_addr = PTR_SEG_OFF_TO_SEGPTR( sel, 0 );
 260
 261     CS_reg(context) = HIWORD(seg_addr);
 262     IP_reg(context) = LOWORD(seg_addr);
 263     EBP_reg(context) = OFFSETOF( thdb->cur_stack )
 264                                + (WORD)&((STACK16FRAME*)0)->bp;
 265     Callbacks->CallRegisterShortProc(context, args*sizeof(WORD));
 266     UnMapLS(seg_addr);
 267 #endif
 268     return 0;
 269 }
 270
 271
 272 /**********************************************************************
 273  *          INT_DoRealModeInt
 274  */
 275 static void INT_DoRealModeInt( CONTEXT *context )
 276 {
 277     CONTEXT realmode_ctx;
 278     FARPROC16 rm_int = INT_GetRMHandler( BL_reg(context) );
 279     REALMODECALL *call = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(context),
 280                                                           DI_reg(context) );
 281     INT_GetRealModeContext( call, &realmode_ctx );
 282
 283 #ifdef MZ_SUPPORTED
 284     /* we need to check if a real-mode program has hooked the interrupt */
 285     if (HIWORD(rm_int)!=0xF000) {
 286         /* yup, which means we need to switch to real mode... */
 287         CS_reg(&realmode_ctx) = HIWORD(rm_int);
 288         EIP_reg(&realmode_ctx) = LOWORD(rm_int);
 289         if (DPMI_CallRMProc( &realmode_ctx, NULL, 0, TRUE))
 290           SET_CFLAG(context);
 291     } else
 292 #endif
 293     {
 294         RESET_CFLAG(context);
 295         if (INT_RealModeInterrupt( BL_reg(context), &realmode_ctx ))
 296           SET_CFLAG(context);
 297         if (EFL_reg(context)&1) {
 298           FIXME(int31,"%02x: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
 299                 BL_reg(context), EAX_reg(&realmode_ctx), EBX_reg(&realmode_ctx),
 300                 ECX_reg(&realmode_ctx), EDX_reg(&realmode_ctx));
 301           FIXME(int31,"      ESI=%08lx EDI=%08lx DS=%04lx ES=%04lx\n",
 302                 ESI_reg(&realmode_ctx), EDI_reg(&realmode_ctx),
 303                 DS_reg(&realmode_ctx), ES_reg(&realmode_ctx) );
 304         }
 305     }
 306     INT_SetRealModeContext( call, &realmode_ctx );
 307 }
 308
 309
 310 static void CallRMProcFar( CONTEXT *context )
 311 {
 312     REALMODECALL *p = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(context), DI_reg(context) );
 313     CONTEXT context16;
 314     THDB *thdb = THREAD_Current();
 315     WORD argsize, sel;
 316     LPVOID addr;
 317     SEGPTR seg_addr;
 318
 319     TRACE(int31, "RealModeCall: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
 320         p->eax, p->ebx, p->ecx, p->edx);
 321     TRACE(int31, "              ESI=%08lx EDI=%08lx ES=%04x DS=%04x CS:IP=%04x:%04x, %d WORD arguments\n",
 322         p->esi, p->edi, p->es, p->ds, p->cs, p->ip, CX_reg(context) );
 323
 324     if (!(p->cs) && !(p->ip)) { /* remove this check
 325                                    if Int21/6501 case map function
 326                                    has been implemented */
 327         SET_CFLAG(context);
 328         return;
 329     }
 330     INT_GetRealModeContext(p, &context16);
 331
 332 #if 0
 333     addr = DOSMEM_MapRealToLinear(MAKELONG(p->ip, p->cs));
 334     sel = SELECTOR_AllocBlock( addr, 0x10000, SEGMENT_CODE, FALSE, FALSE );
 335     seg_addr = PTR_SEG_OFF_TO_SEGPTR( sel, 0 );
 336
 337     CS_reg(&context16) = HIWORD(seg_addr);
 338     IP_reg(&context16) = LOWORD(seg_addr);
 339     EBP_reg(&context16) = OFFSETOF( thdb->cur_stack )
 340                                + (WORD)&((STACK16FRAME*)0)->bp;
 341
 342     argsize = CX_reg(context)*sizeof(WORD);
 343     memcpy( ((LPBYTE)THREAD_STACK16(thdb))-argsize,
 344     (LPBYTE)PTR_SEG_OFF_TO_LIN(SS_reg(context), SP_reg(context))+6, argsize );
 345
 346     Callbacks->CallRegisterShortProc(&context16, argsize);
 347
 348     UnMapLS(seg_addr);
 349 #else
 350     DPMI_CallRMProc( &context16, ((LPWORD)PTR_SEG_OFF_TO_LIN(SS_reg(context), SP_reg(context)))+3,
 351                      CX_reg(context), 0 );
 352 #endif
 353     INT_SetRealModeContext(p, &context16);
 354 }
 355
 356
 357 void WINAPI RMCallbackProc( FARPROC16 pmProc, REALMODECALL *rmc )
 358 {
 359     CONTEXT ctx;
 360     INT_GetRealModeContext(rmc, &ctx);
 361     Callbacks->CallRegisterShortProc(&ctx, 0);
 362 }
 363
 364
 365 static void AllocRMCB( CONTEXT *context )
 366 {
 367     RMCB *NewRMCB = HeapAlloc(GetProcessHeap(), 0, sizeof(RMCB));
 368     REALMODECALL *p = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(context), DI_reg(context) );
 369     UINT16 uParagraph;
 370
 371     FIXME(int31, "EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n", p->eax, p->ebx, p->ecx, p->edx);
 372     FIXME(int31, "           ESI=%08lx EDI=%08lx ES=%04x DS=%04x CS:IP=%04x:%04x\n", p->esi, p->edi, p->es, p->ds, p->cs, p->ip);
 373     FIXME(int31, "           Function to call: %04x:%04x\n",
 374          (WORD)DS_reg(context), SI_reg(context) );
 375
 376     if (NewRMCB)
 377     {
 378         LPVOID RMCBmem = DOSMEM_GetBlock(0, 20, &uParagraph);
 379         LPBYTE p = RMCBmem;
 380
 381         *p++ = 0x68; /* pushl */
 382         *(FARPROC16 *)p =
 383         PTR_SEG_OFF_TO_LIN(ES_reg(context), SI_reg(context)); /* pmode proc to call */
 384         p+=4;
 385         *p++ = 0x68; /* pushl */
 386         *(LPVOID *)p =
 387         PTR_SEG_OFF_TO_LIN(ES_reg(context), DI_reg(context));
 388         p+=4;
 389         *p++ = 0x9a; /* lcall */
 390         *(FARPROC16 *)p = (FARPROC16)RMCallbackProc; /* FIXME ? */
 391         p+=4;
 392         GET_CS(*(WORD *)p);
 393         p+=2;
 394         *p++=0xc3; /* retf */
 395         NewRMCB->address = MAKELONG(0, uParagraph);
 396         NewRMCB->next = FirstRMCB;
 397         FirstRMCB = NewRMCB;
 398         CX_reg(context) = uParagraph;
 399         DX_reg(context) = 0;
 400     }
 401     else
 402     {
 403         AX_reg(context) = 0x8015; /* callback unavailable */
 404         SET_CFLAG(context);
 405     }
 406 }
 407
 408
 409 static void FreeRMCB( CONTEXT *context )
 410 {
 411     RMCB *CurrRMCB = FirstRMCB;
 412     RMCB *PrevRMCB = NULL;
 413
 414     FIXME(int31, "callback address: %04x:%04x\n",
 415           CX_reg(context), DX_reg(context));
 416
 417     while (CurrRMCB && (CurrRMCB->address != MAKELONG(DX_reg(context), CX_reg(context))))
 418     {
 419         PrevRMCB = CurrRMCB;
 420         CurrRMCB = CurrRMCB->next;
 421     }
 422     if (CurrRMCB)
 423     {
 424         if (PrevRMCB)
 425         PrevRMCB->next = CurrRMCB->next;
 426             else
 427         FirstRMCB = CurrRMCB->next;
 428         DOSMEM_FreeBlock(0, DOSMEM_MapRealToLinear(CurrRMCB->address));
 429         HeapFree(GetProcessHeap(), 0, CurrRMCB);
 430     }
 431     else
 432     {
 433         AX_reg(context) = 0x8024; /* invalid callback address */
 434         SET_CFLAG(context);
 435     }
 436 }
 437
 438 #ifdef MZ_SUPPORTED
 439 /* (see loader/dos/module.c, function MZ_InitDPMI) */
 440
 441 static void StartPM( CONTEXT *context, LPDOSTASK lpDosTask )
 442 {
 443     char *base = DOSMEM_MemoryBase(0);
 444     UINT16 cs, ss, ds, es;
 445     CONTEXT pm_ctx;
 446
 447     RESET_CFLAG(context);
 448     lpDosTask->dpmi_flag = AX_reg(context);
 449 /* our mode switch wrapper have placed the desired CS into DX */
 450     cs = SELECTOR_AllocBlock( base + (DWORD)(DX_reg(context)<<4), 0x10000, SEGMENT_CODE, FALSE, FALSE );
 451     ss = SELECTOR_AllocBlock( base + (DWORD)(SS_reg(context)<<4), 0x10000, SEGMENT_DATA, FALSE, FALSE );
 452     ds = SELECTOR_AllocBlock( base + (DWORD)(DS_reg(context)<<4), 0x10000, SEGMENT_DATA, FALSE, FALSE );
 453     es = SELECTOR_AllocBlock( base + (DWORD)(lpDosTask->psp_seg<<4), 0x100, SEGMENT_DATA, FALSE, FALSE );
 454
 455     pm_ctx = *context;
 456     CS_reg(&pm_ctx) = lpDosTask->dpmi_sel;
 457 /* our mode switch wrapper expects the new CS in DX, and the new SS in AX */
 458     AX_reg(&pm_ctx) = ss;
 459     DX_reg(&pm_ctx) = cs;
 460     DS_reg(&pm_ctx) = ds;
 461     ES_reg(&pm_ctx) = es;
 462     FS_reg(&pm_ctx) = 0;
 463     GS_reg(&pm_ctx) = 0;
 464
 465     TRACE(int31,"DOS program is now entering protected mode\n");
 466     Callbacks->CallRegisterShortProc(&pm_ctx, 0);
 467
 468     /* in the current state of affairs, we won't ever actually return here... */
 469
 470     UnMapLS(PTR_SEG_OFF_TO_SEGPTR(es,0));
 471     UnMapLS(PTR_SEG_OFF_TO_SEGPTR(ds,0));
 472     UnMapLS(PTR_SEG_OFF_TO_SEGPTR(ss,0));
 473     UnMapLS(PTR_SEG_OFF_TO_SEGPTR(cs,0));
 474 }
 475 #endif
 476
 477 /**********************************************************************
 478  *          INT_Int31Handler
 479  *
 480  * Handler for int 31h (DPMI).
 481  */
 482
 483 void WINAPI INT_Int31Handler( CONTEXT *context )
 484 {
 485     /*
 486      * Note: For Win32s processes, the whole linear address space is
 487      *       shifted by 0x10000 relative to the OS linear address space.
 488      *       See the comment in msdos/vxd.c.
 489      */
 490     DWORD offset = W32S_APPLICATION() ? W32S_OFFSET : 0;
 491
 492     DWORD dw;
 493     BYTE *ptr;
 494
 495     TDB *pTask = (TDB *)GlobalLock16( GetCurrentTask() );
 496     NE_MODULE *pModule = pTask ? NE_GetPtr( pTask->hModule ) : NULL;
 497
 498     GlobalUnlock16( GetCurrentTask() );
 499
 500 #ifdef MZ_SUPPORTED
 501     if (ISV86(context) && pModule && pModule->lpDosTask) {
 502         /* Called from real mode, check if it's our wrapper */
 503         TRACE(int31,"called from real mode\n");
 504         if (CS_reg(context)==pModule->lpDosTask->dpmi_seg) {
 505             /* This is the protected mode switch */
 506             StartPM(context,pModule->lpDosTask);
 507             return;
 508         } else
 509         if (CS_reg(context)==pModule->lpDosTask->xms_seg) {
 510             /* This is the XMS driver entry point */
 511             XMS_Handler(context);
 512             return;
 513         }
 514     }
 515 #endif
 516
 517     RESET_CFLAG(context);
 518     switch(AX_reg(context))
 519     {
 520     case 0x0000:  /* Allocate LDT descriptors */
 521         TRACE(int31,"allocate LDT descriptors (%d)\n",CX_reg(context));
 522         if (!(AX_reg(context) = AllocSelectorArray( CX_reg(context) )))
 523         {
 524             TRACE(int31,"failed\n");
 525             AX_reg(context) = 0x8011;  /* descriptor unavailable */
 526             SET_CFLAG(context);
 527         }
 528         TRACE(int31,"success, array starts at 0x%04x\n",AX_reg(context));
 529         break;
 530
 531     case 0x0001:  /* Free LDT descriptor */
 532         TRACE(int31,"free LDT descriptor (0x%04x)\n",BX_reg(context));
 533         if (FreeSelector( BX_reg(context) ))
 534         {
 535             AX_reg(context) = 0x8022;  /* invalid selector */
 536             SET_CFLAG(context);
 537         }
 538         else
 539         {
 540             /* If a segment register contains the selector being freed, */
 541             /* set it to zero. */
 542             if (!((DS_reg(context)^BX_reg(context)) & ~3)) DS_reg(context) = 0;
 543             if (!((ES_reg(context)^BX_reg(context)) & ~3)) ES_reg(context) = 0;
 544             if (!((FS_reg(context)^BX_reg(context)) & ~3)) FS_reg(context) = 0;
 545             if (!((GS_reg(context)^BX_reg(context)) & ~3)) GS_reg(context) = 0;
 546         }
 547         break;
 548
 549     case 0x0002:  /* Real mode segment to descriptor */
 550         TRACE(int31,"real mode segment to descriptor (0x%04x)\n",BX_reg(context));
 551         {
 552             WORD entryPoint = 0;  /* KERNEL entry point for descriptor */
 553             switch(BX_reg(context))
 554             {
 555             case 0x0000: entryPoint = 183; break;  /* __0000H */
 556             case 0x0040: entryPoint = 193; break;  /* __0040H */
 557             case 0xa000: entryPoint = 174; break;  /* __A000H */
 558             case 0xb000: entryPoint = 181; break;  /* __B000H */
 559             case 0xb800: entryPoint = 182; break;  /* __B800H */
 560             case 0xc000: entryPoint = 195; break;  /* __C000H */
 561             case 0xd000: entryPoint = 179; break;  /* __D000H */
 562             case 0xe000: entryPoint = 190; break;  /* __E000H */
 563             case 0xf000: entryPoint = 194; break;  /* __F000H */
 564             default:
 565                 AX_reg(context) = DOSMEM_AllocSelector(BX_reg(context));
 566                 break;
 567             }
 568             if (entryPoint)
 569                 AX_reg(context) = LOWORD(NE_GetEntryPoint(
 570                                                  GetModuleHandle16( "KERNEL" ),
 571                                                  entryPoint ));
 572         }
 573         break;
 574
 575     case 0x0003:  /* Get next selector increment */
 576         TRACE(int31,"get selector increment (__AHINCR)\n");
 577         AX_reg(context) = __AHINCR;
 578         break;
 579
 580     case 0x0004:  /* Lock selector (not supported) */
 581         FIXME(int31,"lock selector not supported\n");
 582         AX_reg(context) = 0;  /* FIXME: is this a correct return value? */
 583         break;
 584
 585     case 0x0005:  /* Unlock selector (not supported) */
 586         FIXME(int31,"unlock selector not supported\n");
 587         AX_reg(context) = 0;  /* FIXME: is this a correct return value? */
 588         break;
 589
 590     case 0x0006:  /* Get selector base address */
 591         TRACE(int31,"get selector base address (0x%04x)\n",BX_reg(context));
 592         if (!(dw = GetSelectorBase( BX_reg(context) )))
 593         {
 594             AX_reg(context) = 0x8022;  /* invalid selector */
 595             SET_CFLAG(context);
 596         }
 597         else
 598         {
 599 #ifdef MZ_SUPPORTED
 600             if (pModule && pModule->lpDosTask) {
 601                 DWORD base = (DWORD)DOSMEM_MemoryBase(pModule->self);
 602                 if ((dw >= base) && (dw < base + 0x110000)) dw -= base;
 603             }
 604 #endif
 605             CX_reg(context) = HIWORD(W32S_WINE2APP(dw, offset));
 606             DX_reg(context) = LOWORD(W32S_WINE2APP(dw, offset));
 607         }
 608         break;
 609
 610     case 0x0007:  /* Set selector base address */
 611         TRACE(int31, "set selector base address (0x%04x,0x%08lx)\n",
 612                      BX_reg(context),
 613                      W32S_APP2WINE(MAKELONG(DX_reg(context),CX_reg(context)), offset));
 614         dw = W32S_APP2WINE(MAKELONG(DX_reg(context), CX_reg(context)), offset);
 615 #ifdef MZ_SUPPORTED
 616         /* well, what else could we possibly do? */
 617         if (pModule && pModule->lpDosTask) {
 618             if (dw < 0x110000) dw += (DWORD)DOSMEM_MemoryBase(pModule->self);
 619         }
 620 #endif
 621         SetSelectorBase(BX_reg(context), dw);
 622         break;
 623
 624     case 0x0008:  /* Set selector limit */
 625         TRACE(int31,"set selector limit (0x%04x,0x%08lx)\n",BX_reg(context),MAKELONG(DX_reg(context),CX_reg(context)));
 626         dw = MAKELONG( DX_reg(context), CX_reg(context) );
 627 #ifdef MZ_SUPPORTED
 628         if (pModule && pModule->lpDosTask) {
 629             DWORD base = GetSelectorBase( BX_reg(context) );
 630             if ((dw == 0xffffffff) || ((base < 0x110000) && (base + dw > 0x110000))) {
 631                 AX_reg(context) = 0x8021;  /* invalid value */
 632                 SET_CFLAG(context);
 633                 break;
 634             }
 635         }
 636 #endif
 637         SetSelectorLimit( BX_reg(context), dw );
 638         break;
 639
 640     case 0x0009:  /* Set selector access rights */
 641         TRACE(int31,"set selector access rights(0x%04x,0x%04x)\n",BX_reg(context),CX_reg(context));
 642         SelectorAccessRights( BX_reg(context), 1, CX_reg(context) );
 643         break;
 644
 645     case 0x000a:  /* Allocate selector alias */
 646         TRACE(int31,"allocate selector alias (0x%04x)\n",BX_reg(context));
 647         if (!(AX_reg(context) = AllocCStoDSAlias( BX_reg(context) )))
 648         {
 649             AX_reg(context) = 0x8011;  /* descriptor unavailable */
 650             SET_CFLAG(context);
 651         }
 652         break;
 653
 654     case 0x000b:  /* Get descriptor */
 655         TRACE(int31,"get descriptor (0x%04x)\n",BX_reg(context));
 656         {
 657             ldt_entry entry;
 658             LDT_GetEntry( SELECTOR_TO_ENTRY( BX_reg(context) ), &entry );
 659             entry.base = W32S_WINE2APP(entry.base, offset);
 660
 661             /* FIXME: should use ES:EDI for 32-bit clients */
 662             LDT_EntryToBytes( PTR_SEG_OFF_TO_LIN( ES_reg(context),
 663                                                   DI_reg(context) ), &entry );
 664         }
 665         break;
 666
 667     case 0x000c:  /* Set descriptor */
 668         TRACE(int31,"set descriptor (0x%04x)\n",BX_reg(context));
 669         {
 670             ldt_entry entry;
 671             LDT_BytesToEntry( PTR_SEG_OFF_TO_LIN( ES_reg(context),
 672                                                   DI_reg(context) ), &entry );
 673             entry.base = W32S_APP2WINE(entry.base, offset);
 674
 675             LDT_SetEntry( SELECTOR_TO_ENTRY( BX_reg(context) ), &entry );
 676         }
 677         break;
 678
 679     case 0x000d:  /* Allocate specific LDT descriptor */
 680         FIXME(int31,"allocate descriptor (0x%04x), stub!\n",BX_reg(context));
 681         AX_reg(context) = 0x8011; /* descriptor unavailable */
 682         SET_CFLAG(context);
 683         break;
 684     case 0x0100:  /* Allocate DOS memory block */
 685         TRACE(int31,"allocate DOS memory block (0x%x paragraphs)\n",BX_reg(context));
 686         dw = GlobalDOSAlloc((DWORD)BX_reg(context)<<4);
 687         if (dw) {
 688             AX_reg(context) = HIWORD(dw);
 689             DX_reg(context) = LOWORD(dw);
 690         } else {
 691             AX_reg(context) = 0x0008; /* insufficient memory */
 692             BX_reg(context) = DOSMEM_Available(0)>>4;
 693             SET_CFLAG(context);
 694         }
 695         break;
 696     case 0x0101:  /* Free DOS memory block */
 697         TRACE(int31,"free DOS memory block (0x%04x)\n",DX_reg(context));
 698         dw = GlobalDOSFree(DX_reg(context));
 699         if (!dw) {
 700             AX_reg(context) = 0x0009; /* memory block address invalid */
 701             SET_CFLAG(context);
 702         }
 703         break;
 704     case 0x0200: /* get real mode interrupt vector */
 705         FIXME(int31,"get realmode interupt vector(0x%02x) unimplemented.\n",
 706               BL_reg(context));
 707         SET_CFLAG(context);
 708         break;
 709     case 0x0201: /* set real mode interrupt vector */
 710         FIXME(int31, "set realmode interupt vector(0x%02x,0x%04x:0x%04x) unimplemented\n", BL_reg(context),CX_reg(context),DX_reg(context));
 711         SET_CFLAG(context);
 712         break;
 713     case 0x0204:  /* Get protected mode interrupt vector */
 714         TRACE(int31,"get protected mode interrupt handler (0x%02x), stub!\n",BL_reg(context));
 715         dw = (DWORD)INT_GetPMHandler( BL_reg(context) );
 716         CX_reg(context) = HIWORD(dw);
 717         DX_reg(context) = LOWORD(dw);
 718         break;
 719
 720     case 0x0205:  /* Set protected mode interrupt vector */
 721         TRACE(int31,"set protected mode interrupt handler (0x%02x,%p), stub!\n",
 722             BL_reg(context),PTR_SEG_OFF_TO_LIN(CX_reg(context),DX_reg(context)));
 723         INT_SetPMHandler( BL_reg(context),
 724                           (FARPROC16)PTR_SEG_OFF_TO_SEGPTR( CX_reg(context),
 725                                                             DX_reg(context) ));
 726         break;
 727
 728     case 0x0300:  /* Simulate real mode interrupt */
 729         INT_DoRealModeInt( context );
 730         break;
 731
 732     case 0x0301:  /* Call real mode procedure with far return */
 733         CallRMProcFar( context );
 734         break;
 735
 736     case 0x0302:  /* Call real mode procedure with interrupt return */
 737         {
 738             REALMODECALL *p = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(context), DI_reg(context) );
 739             FIXME(int31, "RealModeCallIret: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n", p->eax, p->ebx, p->ecx, p->edx);
 740             FIXME(int31, "                  ESI=%08lx EDI=%08lx ES=%04x DS=%04x CS:IP=%04x:%04x\n", p->esi, p->edi, p->es, p->ds, p->cs, p->ip );
 741             SET_CFLAG(context);
 742         }
 743         break;
 744
 745     case 0x0303:  /* Allocate Real Mode Callback Address */
 746         AllocRMCB( context );
 747         break;
 748
 749     case 0x0304:  /* Free Real Mode Callback Address */
 750         FreeRMCB( context );
 751         break;
 752
 753     case 0x0400:  /* Get DPMI version */
 754         TRACE(int31,"get DPMI version\n");
 755         {
 756             SYSTEM_INFO si;
 757
 758             GetSystemInfo(&si);
 759             AX_reg(context) = 0x005a;  /* DPMI version 0.90 */
 760             BX_reg(context) = 0x0005;  /* Flags: 32-bit, virtual memory */
 761             CL_reg(context) = si.wProcessorLevel;
 762             DX_reg(context) = 0x0102;  /* Master/slave interrupt controller base*/
 763             break;
 764         }
 765     case 0x0500:  /* Get free memory information */
 766         TRACE(int31,"get free memory information\n");
 767         {
 768             MEMMANINFO mmi;
 769
 770             mmi.dwSize = sizeof(mmi);
 771             MemManInfo(&mmi);
 772             ptr = (BYTE *)PTR_SEG_OFF_TO_LIN(ES_reg(context),DI_reg(context));
 773             /* the layout is just the same as MEMMANINFO, but without
 774              * the dwSize entry.
 775              */
 776             memcpy(ptr,((char*)&mmi)+4,sizeof(mmi)-4);
 777             break;
 778         }
 779     case 0x0501:  /* Allocate memory block */
 780         TRACE(int31,"allocate memory block (%ld)\n",MAKELONG(CX_reg(context),BX_reg(context)));
 781         if (!(ptr = (BYTE *)DPMI_xalloc(MAKELONG(CX_reg(context), BX_reg(context)))))
 782         {
 783             AX_reg(context) = 0x8012;  /* linear memory not available */
 784             SET_CFLAG(context);
 785         } else {
 786             BX_reg(context) = SI_reg(context) = HIWORD(W32S_WINE2APP(ptr, offset));
 787             CX_reg(context) = DI_reg(context) = LOWORD(W32S_WINE2APP(ptr, offset));
 788         }
 789         break;
 790
 791     case 0x0502:  /* Free memory block */
 792         TRACE(int31, "free memory block (0x%08lx)\n",
 793                      W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context)), offset));
 794         DPMI_xfree( (void *)W32S_APP2WINE(MAKELONG(DI_reg(context),
 795                                                SI_reg(context)), offset) );
 796         break;
 797
 798     case 0x0503:  /* Resize memory block */
 799         TRACE(int31, "resize memory block (0x%08lx,%ld)\n",
 800                      W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context)), offset),
 801                      MAKELONG(CX_reg(context),BX_reg(context)));
 802         if (!(ptr = (BYTE *)DPMI_xrealloc(
 803                 (void *)W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context)), offset),
 804                 MAKELONG(CX_reg(context),BX_reg(context)))))
 805         {
 806             AX_reg(context) = 0x8012;  /* linear memory not available */
 807             SET_CFLAG(context);
 808         } else {
 809             BX_reg(context) = SI_reg(context) = HIWORD(W32S_WINE2APP(ptr, offset));
 810             CX_reg(context) = DI_reg(context) = LOWORD(W32S_WINE2APP(ptr, offset));
 811         }
 812         break;
 813
 814     case 0x0507:  /* Modify page attributes */
 815         FIXME(int31,"modify page attributes unimplemented\n");
 816         break;  /* Just ignore it */
 817
 818     case 0x0600:  /* Lock linear region */
 819         FIXME(int31,"lock linear region unimplemented\n");
 820         break;  /* Just ignore it */
 821
 822     case 0x0601:  /* Unlock linear region */
 823         FIXME(int31,"unlock linear region unimplemented\n");
 824         break;  /* Just ignore it */
 825
 826     case 0x0602:  /* Unlock real-mode region */
 827         FIXME(int31,"unlock realmode region unimplemented\n");
 828         break;  /* Just ignore it */
 829
 830     case 0x0603:  /* Lock real-mode region */
 831         FIXME(int31,"lock realmode region unimplemented\n");
 832         break;  /* Just ignore it */
 833
 834     case 0x0604:  /* Get page size */
 835         TRACE(int31,"get pagesize\n");
 836         BX_reg(context) = 0;
 837         CX_reg(context) = VIRTUAL_GetPageSize();
 838         break;
 839
 840     case 0x0702:  /* Mark page as demand-paging candidate */
 841         FIXME(int31,"mark page as demand-paging candidate\n");
 842         break;  /* Just ignore it */
 843
 844     case 0x0703:  /* Discard page contents */
 845         FIXME(int31,"discard page contents\n");
 846         break;  /* Just ignore it */
 847
 848      case 0x0800:  /* Physical address mapping */
 849         FIXME(int31,"map real to linear (0x%08lx)\n",MAKELONG(CX_reg(context),BX_reg(context)));
 850          if(!(ptr=DOSMEM_MapRealToLinear(MAKELONG(CX_reg(context),BX_reg(context)))))
 851          {
 852              AX_reg(context) = 0x8021;
 853              SET_CFLAG(context);
 854          }
 855          else
 856          {
 857              BX_reg(context) = HIWORD(W32S_WINE2APP(ptr, offset));
 858              CX_reg(context) = LOWORD(W32S_WINE2APP(ptr, offset));
 859              RESET_CFLAG(context);
 860          }
 861          break;
 862
 863     default:
 864         INT_BARF( context, 0x31 );
 865         AX_reg(context) = 0x8001;  /* unsupported function */
 866         SET_CFLAG(context);
 867         break;
 868     }
 869
 870 }