msdos/dpmi.c

   1 /*
   2  * DPMI 0.9 emulation
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <unistd.h>
  25 #include <string.h>
  26
  27 #include "windef.h"
  28 #include "wine/winbase16.h"
  29 #include "miscemu.h"
  30 #include "msdos.h"
  31 #include "task.h"
  32 #include "toolhelp.h"
  33 #include "selectors.h"
  34 #include "callback.h"
  35 #include "wine/debug.h"
  36
  37 WINE_DEFAULT_DEBUG_CHANNEL(int31);
  38
  39 #define DOS_GET_DRIVE(reg) ((reg) ? (reg) - 1 : DRIVE_GetCurrentDrive())
  40
  41 void CreateBPB(int drive, BYTE *data, BOOL16 limited);  /* defined in int21.c */
  42
  43 static void* lastvalloced = NULL;
  44
  45
  46 DOSVM_TABLE Dosvm = { NULL, };
  47
  48 static HMODULE DosModule;
  49
  50 /**********************************************************************
  51  *          DPMI_LoadDosSystem
  52  */
  53 BOOL DPMI_LoadDosSystem(void)
  54 {
  55     if (DosModule) return TRUE;
  56     DosModule = LoadLibraryA( "winedos.dll" );
  57     if (!DosModule) {
  58         ERR("could not load winedos.dll, DOS subsystem unavailable\n");
  59         return FALSE;
  60     }
  61 #define GET_ADDR(func)  Dosvm.func = (void *)GetProcAddress(DosModule, #func);
  62
  63     GET_ADDR(LoadDosExe);
  64     GET_ADDR(CallRMInt);
  65     GET_ADDR(CallRMProc);
  66     GET_ADDR(AllocRMCB);
  67     GET_ADDR(FreeRMCB);
  68     GET_ADDR(SetTimer);
  69     GET_ADDR(GetTimer);
  70     GET_ADDR(inport);
  71     GET_ADDR(outport);
  72     GET_ADDR(ASPIHandler);
  73 #undef GET_ADDR
  74     return TRUE;
  75 }
  76
  77 /**********************************************************************
  78  *          DPMI_xalloc
  79  * special virtualalloc, allocates lineary monoton growing memory.
  80  * (the usual VirtualAlloc does not satisfy that restriction)
  81  */
  82 static LPVOID
  83 DPMI_xalloc(int len) {
  84         LPVOID  ret;
  85         LPVOID  oldlastv = lastvalloced;
  86
  87         if (lastvalloced) {
  88                 int     xflag = 0;
  89                 ret = NULL;
  90                 while (!ret) {
  91                         ret=VirtualAlloc(lastvalloced,len,MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
  92                         if (!ret)
  93                                 lastvalloced = (char *) lastvalloced + 0x10000;
  94                         /* we failed to allocate one in the first round.
  95                          * try non-linear
  96                          */
  97                         if (!xflag && (lastvalloced<oldlastv)) { /* wrapped */
  98                                 FIXME("failed to allocate lineary growing memory (%d bytes), using non-linear growing...\n",len);
  99                                 xflag++;
 100                         }
 101                         /* if we even fail to allocate something in the next
 102                          * round, return NULL
 103                          */
 104                         if ((xflag==1) && (lastvalloced >= oldlastv))
 105                                 xflag++;
 106                         if ((xflag==2) && (lastvalloced < oldlastv)) {
 107                                 FIXME("failed to allocate any memory of %d bytes!\n",len);
 108                                 return NULL;
 109                         }
 110                 }
 111         } else
 112                  ret=VirtualAlloc(NULL,len,MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
 113         lastvalloced = (LPVOID)(((DWORD)ret+len+0xffff)&~0xffff);
 114         return ret;
 115 }
 116
 117 static void
 118 DPMI_xfree(LPVOID ptr) {
 119         VirtualFree(ptr,0,MEM_RELEASE);
 120 }
 121
 122 /* FIXME: perhaps we could grow this mapped area... */
 123 static LPVOID
 124 DPMI_xrealloc(LPVOID ptr,DWORD newsize) {
 125         MEMORY_BASIC_INFORMATION        mbi;
 126         LPVOID                          newptr;
 127
 128         newptr = DPMI_xalloc(newsize);
 129         if (ptr) {
 130                 if (!VirtualQuery(ptr,&mbi,sizeof(mbi))) {
 131                         FIXME("realloc of DPMI_xallocd region %p?\n",ptr);
 132                         return NULL;
 133                 }
 134                 if (mbi.State == MEM_FREE) {
 135                         FIXME("realloc of DPMI_xallocd region %p?\n",ptr);
 136                         return NULL;
 137                 }
 138                 /* We do not shrink allocated memory. most reallocs
 139                  * only do grows anyway
 140                  */
 141                 if (newsize<=mbi.RegionSize)
 142                         return ptr;
 143                 memcpy(newptr,ptr,mbi.RegionSize);
 144                 DPMI_xfree(ptr);
 145         }
 146         return newptr;
 147 }
 148
 149 /**********************************************************************
 150  *          CallRMInt
 151  */
 152 static void CallRMInt( CONTEXT86 *context )
 153 {
 154     if (!Dosvm.CallRMInt && !DPMI_LoadDosSystem())
 155     {
 156         ERR("could not setup real-mode calls\n");
 157         return;
 158     }
 159     Dosvm.CallRMInt( context );
 160 }
 161
 162
 163 static void CallRMProc( CONTEXT86 *context, int iret )
 164 {
 165     if (!Dosvm.CallRMProc && !DPMI_LoadDosSystem())
 166     {
 167         ERR("could not setup real-mode calls\n");
 168         return;
 169     }
 170     Dosvm.CallRMProc( context, iret );
 171 }
 172
 173 static void AllocRMCB( CONTEXT86 *context )
 174 {
 175     if (!Dosvm.AllocRMCB && !DPMI_LoadDosSystem())
 176     {
 177         ERR("could not setup real-mode calls\n");
 178         return;
 179     }
 180     Dosvm.AllocRMCB( context );
 181 }
 182
 183 static void FreeRMCB( CONTEXT86 *context )
 184 {
 185     if (!Dosvm.FreeRMCB)  /* cannot have allocated one if dosvm not loaded */
 186     {
 187         SET_LOWORD( context->Eax, 0x8024 ); /* invalid callback address */
 188         SET_CFLAG( context );
 189     }
 190     else Dosvm.FreeRMCB( context );
 191 }
 192
 193
 194 /**********************************************************************
 195  *          INT_Int31Handler (WPROCS.149)
 196  *
 197  * Handler for int 31h (DPMI).
 198  */
 199
 200 void WINAPI INT_Int31Handler( CONTEXT86 *context )
 201 {
 202     /*
 203      * Note: For Win32s processes, the whole linear address space is
 204      *       shifted by 0x10000 relative to the OS linear address space.
 205      *       See the comment in msdos/vxd.c.
 206      */
 207     DWORD dw;
 208     BYTE *ptr;
 209
 210     RESET_CFLAG(context);
 211     switch(AX_reg(context))
 212     {
 213     case 0x0000:  /* Allocate LDT descriptors */
 214         TRACE("allocate LDT descriptors (%d)\n",CX_reg(context));
 215         if (!(context->Eax = AllocSelectorArray16( CX_reg(context) )))
 216         {
 217             TRACE("failed\n");
 218             context->Eax = 0x8011;  /* descriptor unavailable */
 219             SET_CFLAG(context);
 220         }
 221         TRACE("success, array starts at 0x%04x\n",AX_reg(context));
 222         break;
 223
 224     case 0x0001:  /* Free LDT descriptor */
 225         TRACE("free LDT descriptor (0x%04x)\n",BX_reg(context));
 226         if (FreeSelector16( BX_reg(context) ))
 227         {
 228             context->Eax = 0x8022;  /* invalid selector */
 229             SET_CFLAG(context);
 230         }
 231         else
 232         {
 233             /* If a segment register contains the selector being freed, */
 234             /* set it to zero. */
 235             if (!((context->SegDs^BX_reg(context)) & ~3)) context->SegDs = 0;
 236             if (!((context->SegEs^BX_reg(context)) & ~3)) context->SegEs = 0;
 237             if (!((context->SegFs^BX_reg(context)) & ~3)) context->SegFs = 0;
 238             if (!((context->SegGs^BX_reg(context)) & ~3)) context->SegGs = 0;
 239         }
 240         break;
 241
 242     case 0x0002:  /* Real mode segment to descriptor */
 243         TRACE("real mode segment to descriptor (0x%04x)\n",BX_reg(context));
 244         {
 245             WORD entryPoint = 0;  /* KERNEL entry point for descriptor */
 246             switch(BX_reg(context))
 247             {
 248             case 0x0000: entryPoint = 183; break;  /* __0000H */
 249             case 0x0040: entryPoint = 193; break;  /* __0040H */
 250             case 0xa000: entryPoint = 174; break;  /* __A000H */
 251             case 0xb000: entryPoint = 181; break;  /* __B000H */
 252             case 0xb800: entryPoint = 182; break;  /* __B800H */
 253             case 0xc000: entryPoint = 195; break;  /* __C000H */
 254             case 0xd000: entryPoint = 179; break;  /* __D000H */
 255             case 0xe000: entryPoint = 190; break;  /* __E000H */
 256             case 0xf000: entryPoint = 194; break;  /* __F000H */
 257             default:
 258                 context->Eax = DOSMEM_AllocSelector(BX_reg(context));
 259                 break;
 260             }
 261             if (entryPoint)
 262                 context->Eax = LOWORD(GetProcAddress16( GetModuleHandle16( "KERNEL" ),
 263                                                         (LPCSTR)(ULONG_PTR)entryPoint ));
 264         }
 265         break;
 266
 267     case 0x0003:  /* Get next selector increment */
 268         TRACE("get selector increment (__AHINCR)\n");
 269         context->Eax = __AHINCR;
 270         break;
 271
 272     case 0x0004:  /* Lock selector (not supported) */
 273         FIXME("lock selector not supported\n");
 274         context->Eax = 0;  /* FIXME: is this a correct return value? */
 275         break;
 276
 277     case 0x0005:  /* Unlock selector (not supported) */
 278         FIXME("unlock selector not supported\n");
 279         context->Eax = 0;  /* FIXME: is this a correct return value? */
 280         break;
 281
 282     case 0x0006:  /* Get selector base address */
 283         TRACE("get selector base address (0x%04x)\n",BX_reg(context));
 284         if (!(dw = GetSelectorBase( BX_reg(context) )))
 285         {
 286             context->Eax = 0x8022;  /* invalid selector */
 287             SET_CFLAG(context);
 288         }
 289         else
 290         {
 291             CX_reg(context) = HIWORD(W32S_WINE2APP(dw));
 292             DX_reg(context) = LOWORD(W32S_WINE2APP(dw));
 293         }
 294         break;
 295
 296     case 0x0007:  /* Set selector base address */
 297         TRACE("set selector base address (0x%04x,0x%08lx)\n",
 298                      BX_reg(context),
 299                      W32S_APP2WINE(MAKELONG(DX_reg(context),CX_reg(context))));
 300         dw = W32S_APP2WINE(MAKELONG(DX_reg(context), CX_reg(context)));
 301         if (dw < 0x10000)
 302             /* app wants to access lower 64K of DOS memory, load DOS subsystem */
 303             DPMI_LoadDosSystem();
 304         SetSelectorBase(BX_reg(context), dw);
 305         break;
 306
 307     case 0x0008:  /* Set selector limit */
 308         TRACE("set selector limit (0x%04x,0x%08lx)\n",BX_reg(context),MAKELONG(DX_reg(context),CX_reg(context)));
 309         dw = MAKELONG( DX_reg(context), CX_reg(context) );
 310         SetSelectorLimit16( BX_reg(context), dw );
 311         break;
 312
 313     case 0x0009:  /* Set selector access rights */
 314         TRACE("set selector access rights(0x%04x,0x%04x)\n",BX_reg(context),CX_reg(context));
 315         SelectorAccessRights16( BX_reg(context), 1, CX_reg(context) );
 316         break;
 317
 318     case 0x000a:  /* Allocate selector alias */
 319         TRACE("allocate selector alias (0x%04x)\n",BX_reg(context));
 320         if (!(AX_reg(context) = AllocCStoDSAlias16( BX_reg(context) )))
 321         {
 322             AX_reg(context) = 0x8011;  /* descriptor unavailable */
 323             SET_CFLAG(context);
 324         }
 325         break;
 326
 327     case 0x000b:  /* Get descriptor */
 328         TRACE("get descriptor (0x%04x)\n",BX_reg(context));
 329         {
 330             LDT_ENTRY entry;
 331             wine_ldt_set_base( &entry, (void*)W32S_WINE2APP(wine_ldt_get_base(&entry)) );
 332             /* FIXME: should use ES:EDI for 32-bit clients */
 333             *(LDT_ENTRY *)MapSL( MAKESEGPTR( context->SegEs, LOWORD(context->Edi) )) = entry;
 334         }
 335         break;
 336
 337     case 0x000c:  /* Set descriptor */
 338         TRACE("set descriptor (0x%04x)\n",BX_reg(context));
 339         {
 340             LDT_ENTRY entry = *(LDT_ENTRY *)MapSL(MAKESEGPTR( context->SegEs, LOWORD(context->Edi)));
 341             wine_ldt_set_base( &entry, (void*)W32S_APP2WINE(wine_ldt_get_base(&entry)) );
 342             wine_ldt_set_entry( LOWORD(context->Ebx), &entry );
 343         }
 344         break;
 345
 346     case 0x000d:  /* Allocate specific LDT descriptor */
 347         FIXME("allocate descriptor (0x%04x), stub!\n",BX_reg(context));
 348         AX_reg(context) = 0x8011; /* descriptor unavailable */
 349         SET_CFLAG(context);
 350         break;
 351     case 0x0100:  /* Allocate DOS memory block */
 352         TRACE("allocate DOS memory block (0x%x paragraphs)\n",BX_reg(context));
 353         dw = GlobalDOSAlloc16((DWORD)BX_reg(context)<<4);
 354         if (dw) {
 355             AX_reg(context) = HIWORD(dw);
 356             DX_reg(context) = LOWORD(dw);
 357         } else {
 358             AX_reg(context) = 0x0008; /* insufficient memory */
 359             BX_reg(context) = DOSMEM_Available()>>4;
 360             SET_CFLAG(context);
 361         }
 362         break;
 363     case 0x0101:  /* Free DOS memory block */
 364         TRACE("free DOS memory block (0x%04x)\n",DX_reg(context));
 365         dw = GlobalDOSFree16(DX_reg(context));
 366         if (!dw) {
 367             AX_reg(context) = 0x0009; /* memory block address invalid */
 368             SET_CFLAG(context);
 369         }
 370         break;
 371     case 0x0200: /* get real mode interrupt vector */
 372         FIXME("get realmode interupt vector(0x%02x) unimplemented.\n",
 373               BL_reg(context));
 374         SET_CFLAG(context);
 375         break;
 376     case 0x0201: /* set real mode interrupt vector */
 377         FIXME("set realmode interrupt vector(0x%02x,0x%04x:0x%04x) unimplemented\n", BL_reg(context),CX_reg(context),DX_reg(context));
 378         SET_CFLAG(context);
 379         break;
 380     case 0x0204:  /* Get protected mode interrupt vector */
 381         TRACE("get protected mode interrupt handler (0x%02x), stub!\n",BL_reg(context));
 382         dw = (DWORD)INT_GetPMHandler( BL_reg(context) );
 383         CX_reg(context) = HIWORD(dw);
 384         DX_reg(context) = LOWORD(dw);
 385         break;
 386
 387     case 0x0205:  /* Set protected mode interrupt vector */
 388         TRACE("set protected mode interrupt handler (0x%02x,%p), stub!\n",
 389             BL_reg(context),MapSL(MAKESEGPTR(CX_reg(context),DX_reg(context))));
 390         INT_SetPMHandler( BL_reg(context),
 391                           (FARPROC16)MAKESEGPTR( CX_reg(context), DX_reg(context) ));
 392         break;
 393
 394     case 0x0300:  /* Simulate real mode interrupt */
 395         CallRMInt( context );
 396         break;
 397
 398     case 0x0301:  /* Call real mode procedure with far return */
 399         CallRMProc( context, FALSE );
 400         break;
 401
 402     case 0x0302:  /* Call real mode procedure with interrupt return */
 403         CallRMProc( context, TRUE );
 404         break;
 405
 406     case 0x0303:  /* Allocate Real Mode Callback Address */
 407         AllocRMCB( context );
 408         break;
 409
 410     case 0x0304:  /* Free Real Mode Callback Address */
 411         FreeRMCB( context );
 412         break;
 413
 414     case 0x0305:  /* Get State Save/Restore Addresses */
 415         TRACE("get state save/restore addresses\n");
 416         /* we probably won't need this kind of state saving */
 417         AX_reg(context) = 0;
 418         /* real mode: just point to the lret */
 419         BX_reg(context) = DOSMEM_wrap_seg;
 420         context->Ecx = 2;
 421         /* protected mode: don't have any handler yet... */
 422         FIXME("no protected-mode dummy state save/restore handler yet\n");
 423         SI_reg(context) = 0;
 424         context->Edi = 0;
 425         break;
 426
 427     case 0x0306:  /* Get Raw Mode Switch Addresses */
 428         TRACE("get raw mode switch addresses\n");
 429         /* real mode, point to standard DPMI return wrapper */
 430         BX_reg(context) = DOSMEM_wrap_seg;
 431         context->Ecx = 0;
 432         /* protected mode, point to DPMI call wrapper */
 433         SI_reg(context) = DOSMEM_dpmi_sel;
 434         context->Edi = 8; /* offset of the INT 0x31 call */
 435         break;
 436     case 0x0400:  /* Get DPMI version */
 437         TRACE("get DPMI version\n");
 438         {
 439             SYSTEM_INFO si;
 440
 441             GetSystemInfo(&si);
 442             AX_reg(context) = 0x005a;  /* DPMI version 0.90 */
 443             BX_reg(context) = 0x0005;  /* Flags: 32-bit, virtual memory */
 444             CL_reg(context) = si.wProcessorLevel;
 445             DX_reg(context) = 0x0102;  /* Master/slave interrupt controller base*/
 446             break;
 447         }
 448     case 0x0500:  /* Get free memory information */
 449         TRACE("get free memory information\n");
 450         {
 451             MEMMANINFO mmi;
 452
 453             mmi.dwSize = sizeof(mmi);
 454             MemManInfo16(&mmi);
 455             ptr = MapSL(MAKESEGPTR(context->SegEs,DI_reg(context)));
 456             /* the layout is just the same as MEMMANINFO, but without
 457              * the dwSize entry.
 458              */
 459             memcpy(ptr,((char*)&mmi)+4,sizeof(mmi)-4);
 460             break;
 461         }
 462     case 0x0501:  /* Allocate memory block */
 463         TRACE("allocate memory block (%ld)\n",MAKELONG(CX_reg(context),BX_reg(context)));
 464         if (!(ptr = (BYTE *)DPMI_xalloc(MAKELONG(CX_reg(context), BX_reg(context)))))
 465         {
 466             AX_reg(context) = 0x8012;  /* linear memory not available */
 467             SET_CFLAG(context);
 468         } else {
 469             BX_reg(context) = SI_reg(context) = HIWORD(W32S_WINE2APP(ptr));
 470             CX_reg(context) = DI_reg(context) = LOWORD(W32S_WINE2APP(ptr));
 471         }
 472         break;
 473
 474     case 0x0502:  /* Free memory block */
 475         TRACE("free memory block (0x%08lx)\n",
 476                      W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context))));
 477         DPMI_xfree( (void *)W32S_APP2WINE(MAKELONG(DI_reg(context), SI_reg(context))) );
 478         break;
 479
 480     case 0x0503:  /* Resize memory block */
 481         TRACE("resize memory block (0x%08lx,%ld)\n",
 482                      W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context))),
 483                      MAKELONG(CX_reg(context),BX_reg(context)));
 484         if (!(ptr = (BYTE *)DPMI_xrealloc(
 485                 (void *)W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context))),
 486                 MAKELONG(CX_reg(context),BX_reg(context)))))
 487         {
 488             AX_reg(context) = 0x8012;  /* linear memory not available */
 489             SET_CFLAG(context);
 490         } else {
 491             BX_reg(context) = SI_reg(context) = HIWORD(W32S_WINE2APP(ptr));
 492             CX_reg(context) = DI_reg(context) = LOWORD(W32S_WINE2APP(ptr));
 493         }
 494         break;
 495
 496     case 0x0507:  /* Modify page attributes */
 497         FIXME("modify page attributes unimplemented\n");
 498         break;  /* Just ignore it */
 499
 500     case 0x0600:  /* Lock linear region */
 501         FIXME("lock linear region unimplemented\n");
 502         break;  /* Just ignore it */
 503
 504     case 0x0601:  /* Unlock linear region */
 505         FIXME("unlock linear region unimplemented\n");
 506         break;  /* Just ignore it */
 507
 508     case 0x0602:  /* Unlock real-mode region */
 509         FIXME("unlock realmode region unimplemented\n");
 510         break;  /* Just ignore it */
 511
 512     case 0x0603:  /* Lock real-mode region */
 513         FIXME("lock realmode region unimplemented\n");
 514         break;  /* Just ignore it */
 515
 516     case 0x0604:  /* Get page size */
 517         TRACE("get pagesize\n");
 518         BX_reg(context) = 0;
 519         CX_reg(context) = getpagesize();
 520         break;
 521
 522     case 0x0702:  /* Mark page as demand-paging candidate */
 523         FIXME("mark page as demand-paging candidate\n");
 524         break;  /* Just ignore it */
 525
 526     case 0x0703:  /* Discard page contents */
 527         FIXME("discard page contents\n");
 528         break;  /* Just ignore it */
 529
 530      case 0x0800:  /* Physical address mapping */
 531         FIXME("map real to linear (0x%08lx)\n",MAKELONG(CX_reg(context),BX_reg(context)));
 532          if(!(ptr=DOSMEM_MapRealToLinear(MAKELONG(CX_reg(context),BX_reg(context)))))
 533          {
 534              AX_reg(context) = 0x8021;
 535              SET_CFLAG(context);
 536          }
 537          else
 538          {
 539              BX_reg(context) = HIWORD(W32S_WINE2APP(ptr));
 540              CX_reg(context) = LOWORD(W32S_WINE2APP(ptr));
 541              RESET_CFLAG(context);
 542          }
 543          break;
 544
 545     default:
 546         INT_BARF( context, 0x31 );
 547         AX_reg(context) = 0x8001;  /* unsupported function */
 548         SET_CFLAG(context);
 549         break;
 550     }
 551
 552 }