msdos/dpmi.c

   1 /*
   2  * DPMI 0.9 emulation
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  */
   6
   7 #include <stdio.h>
   8 #include <unistd.h>
   9 #include <string.h>
  10 #include "windows.h"
  11 #include "heap.h"
  12 #include "ldt.h"
  13 #include "module.h"
  14 #include "miscemu.h"
  15 #include "drive.h"
  16 #include "msdos.h"
  17 #include "toolhelp.h"
  18 #include "debug.h"
  19
  20 #define DOS_GET_DRIVE(reg) ((reg) ? (reg) - 1 : DRIVE_GetCurrentDrive())
  21
  22 void CreateBPB(int drive, BYTE *data);  /* defined in int21.c */
  23
  24
  25 /* Structure for real-mode callbacks */
  26 typedef struct
  27 {
  28     DWORD edi;
  29     DWORD esi;
  30     DWORD ebp;
  31     DWORD reserved;
  32     DWORD ebx;
  33     DWORD edx;
  34     DWORD ecx;
  35     DWORD eax;
  36     WORD  fl;
  37     WORD  es;
  38     WORD  ds;
  39     WORD  fs;
  40     WORD  gs;
  41     WORD  ip;
  42     WORD  cs;
  43     WORD  sp;
  44     WORD  ss;
  45 } REALMODECALL;
  46
  47
  48
  49 /**********************************************************************
  50  *          INT_GetRealModeContext
  51  */
  52 static void INT_GetRealModeContext( REALMODECALL *call, CONTEXT *context )
  53 {
  54     EAX_reg(context) = call->eax;
  55     EBX_reg(context) = call->ebx;
  56     ECX_reg(context) = call->ecx;
  57     EDX_reg(context) = call->edx;
  58     ESI_reg(context) = call->esi;
  59     EDI_reg(context) = call->edi;
  60     EBP_reg(context) = call->ebp;
  61     EFL_reg(context) = call->fl;
  62     EIP_reg(context) = call->ip;
  63     ESP_reg(context) = call->sp;
  64     CS_reg(context)  = call->cs;
  65     DS_reg(context)  = call->ds;
  66     ES_reg(context)  = call->es;
  67     FS_reg(context)  = call->fs;
  68     GS_reg(context)  = call->gs;
  69 }
  70
  71
  72 /**********************************************************************
  73  *          INT_SetRealModeContext
  74  */
  75 static void INT_SetRealModeContext( REALMODECALL *call, CONTEXT *context )
  76 {
  77     call->eax = EAX_reg(context);
  78     call->ebx = EBX_reg(context);
  79     call->ecx = ECX_reg(context);
  80     call->edx = EDX_reg(context);
  81     call->esi = ESI_reg(context);
  82     call->edi = EDI_reg(context);
  83     call->ebp = EBP_reg(context);
  84     call->fl  = FL_reg(context);
  85     call->ip  = IP_reg(context);
  86     call->sp  = SP_reg(context);
  87     call->cs  = CS_reg(context);
  88     call->ds  = DS_reg(context);
  89     call->es  = ES_reg(context);
  90     call->fs  = FS_reg(context);
  91     call->gs  = GS_reg(context);
  92 }
  93
  94
  95 /**********************************************************************
  96  *          INT_DoRealModeInt
  97  */
  98 static void INT_DoRealModeInt( CONTEXT *context )
  99 {
 100     CONTEXT realmode_ctx;
 101     REALMODECALL *call = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(context),
 102                                                           DI_reg(context) );
 103     INT_GetRealModeContext( call, &realmode_ctx );
 104
 105     RESET_CFLAG(context);
 106     switch (BL_reg(context))
 107     {
 108     case 0x2f:  /* int2f */
 109         switch (AH_reg(&realmode_ctx))
 110         {
 111         case 0x15:
 112             /* MSCDEX hook */
 113             do_mscdex( &realmode_ctx );
 114             break;
 115         default:
 116             SET_CFLAG(context);
 117             break;
 118         }
 119         break;
 120     case 0x21:  /* int21 */
 121         switch (AH_reg(&realmode_ctx))
 122         {
 123         case 0x52:
 124             ES_reg(&realmode_ctx) = 0;
 125             EBX_reg(&realmode_ctx) = 0;
 126             break;
 127         case 0x65:
 128             switch (AL_reg(&realmode_ctx))
 129             {
 130             case 0x06:
 131                 {/* get collate table */
 132                     /* ES:DI is a REALMODE pointer to 5 byte dosmem
 133                      * we fill that with 0x6, realmode pointer to collateTB
 134                      */
 135                     char *table = DOSMEM_MapRealToLinear(
 136                        MAKELONG(EDI_reg(&realmode_ctx),ES_reg(&realmode_ctx)));
 137                     *(BYTE*)table      = 0x06;
 138                     *(DWORD*)(table+1) = DOSMEM_CollateTable;
 139                     CX_reg(&realmode_ctx) = 258;/*FIXME: size of table?*/
 140                     break;
 141                 }
 142             default:
 143                 SET_CFLAG(context);
 144                 break;
 145             }
 146             break;
 147         case 0x44:
 148             switch (AL_reg(&realmode_ctx))
 149             {
 150             case 0x0D:
 151                 {/* generic block device request */
 152                     BYTE *dataptr = DOSMEM_MapRealToLinear(
 153                        MAKELONG(EDX_reg(&realmode_ctx),DS_reg(&realmode_ctx)));
 154                     int drive = DOS_GET_DRIVE(BL_reg(&realmode_ctx));
 155                     if (CH_reg(&realmode_ctx) != 0x08)
 156                     {
 157                         SET_CFLAG(context);
 158                         break;
 159                     }
 160                     switch (CL_reg(&realmode_ctx))
 161                     {
 162                     case 0x66:
 163                         {
 164                             char    label[12],fsname[9],path[4];
 165                             DWORD   serial;
 166
 167                             strcpy(path,"x:\\");path[0]=drive+'A';
 168                             GetVolumeInformation32A(path,label,12,&serial,NULL,NULL,fsname,9);
 169                             *(WORD*)dataptr         = 0;
 170                             memcpy(dataptr+2,&serial,4);
 171                             memcpy(dataptr+6,label  ,11);
 172                             memcpy(dataptr+17,fsname,8);
 173                             break;
 174                         }
 175                     case 0x60:  /* get device parameters */
 176                                 /* used by defrag.exe of win95 */
 177                         memset(dataptr, 0, 0x26);
 178                         dataptr[0] = 0x04;
 179                         dataptr[6] = 0; /* media type */
 180                         if (drive > 1)
 181                         {
 182                             dataptr[1] = 0x05; /* fixed disk */
 183                             setword(&dataptr[2], 0x01); /* non removable */
 184                             setword(&dataptr[4], 0x300); /* # of cylinders */
 185                         }
 186                         else
 187                         {
 188                             dataptr[1] = 0x07; /* block dev, floppy */
 189                             setword(&dataptr[2], 0x02); /* removable */
 190                             setword(&dataptr[4], 80); /* # of cylinders */
 191                         }
 192                         CreateBPB(drive, &dataptr[7]);
 193                         break;
 194                     default:
 195                         SET_CFLAG(context);
 196                         break;
 197                     }
 198                 }
 199             break;
 200             default:
 201                 SET_CFLAG(context);
 202                 break;
 203             }
 204             break;
 205         default:
 206             SET_CFLAG(context);
 207             break;
 208         }
 209         break;
 210     default:
 211         SET_CFLAG(context);
 212         break;
 213     }
 214
 215     if (EFL_reg(context)&1)
 216       FIXME(int31,"%02x: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
 217             BL_reg(context), EAX_reg(&realmode_ctx), EBX_reg(&realmode_ctx),
 218             ECX_reg(&realmode_ctx), EDX_reg(&realmode_ctx));
 219       FIXME(int31,"      ESI=%08lx EDI=%08lx DS=%04lx ES=%04lx\n",
 220             ESI_reg(&realmode_ctx), EDI_reg(&realmode_ctx),
 221             DS_reg(&realmode_ctx), ES_reg(&realmode_ctx) );
 222     INT_SetRealModeContext( call, &realmode_ctx );
 223 }
 224
 225
 226 /**********************************************************************
 227  *          INT_Int31Handler
 228  *
 229  * Handler for int 31h (DPMI).
 230  */
 231 void WINAPI INT_Int31Handler( CONTEXT *context )
 232 {
 233     DWORD dw;
 234     BYTE *ptr;
 235
 236     RESET_CFLAG(context);
 237     switch(AX_reg(context))
 238     {
 239     case 0x0000:  /* Allocate LDT descriptors */
 240         if (!(AX_reg(context) = AllocSelectorArray( CX_reg(context) )))
 241         {
 242             AX_reg(context) = 0x8011;  /* descriptor unavailable */
 243             SET_CFLAG(context);
 244         }
 245         break;
 246
 247     case 0x0001:  /* Free LDT descriptor */
 248         if (FreeSelector( BX_reg(context) ))
 249         {
 250             AX_reg(context) = 0x8022;  /* invalid selector */
 251             SET_CFLAG(context);
 252         }
 253         else
 254         {
 255             /* If a segment register contains the selector being freed, */
 256             /* set it to zero. */
 257             if (!((DS_reg(context)^BX_reg(context)) & ~3)) DS_reg(context) = 0;
 258             if (!((ES_reg(context)^BX_reg(context)) & ~3)) ES_reg(context) = 0;
 259             if (!((FS_reg(context)^BX_reg(context)) & ~3)) FS_reg(context) = 0;
 260             if (!((GS_reg(context)^BX_reg(context)) & ~3)) GS_reg(context) = 0;
 261         }
 262         break;
 263
 264     case 0x0002:  /* Real mode segment to descriptor */
 265         {
 266             WORD entryPoint = 0;  /* KERNEL entry point for descriptor */
 267             switch(BX_reg(context))
 268             {
 269             case 0x0000: entryPoint = 183; break;  /* __0000H */
 270             case 0x0040: entryPoint = 193; break;  /* __0040H */
 271             case 0xa000: entryPoint = 174; break;  /* __A000H */
 272             case 0xb000: entryPoint = 181; break;  /* __B000H */
 273             case 0xb800: entryPoint = 182; break;  /* __B800H */
 274             case 0xc000: entryPoint = 195; break;  /* __C000H */
 275             case 0xd000: entryPoint = 179; break;  /* __D000H */
 276             case 0xe000: entryPoint = 190; break;  /* __E000H */
 277             case 0xf000: entryPoint = 194; break;  /* __F000H */
 278             default:
 279                 AX_reg(context) = DOSMEM_AllocSelector(BX_reg(context));
 280                 break;
 281             }
 282             if (entryPoint)
 283                 AX_reg(context) = LOWORD(MODULE_GetEntryPoint(
 284                                                  GetModuleHandle16( "KERNEL" ),
 285                                                  entryPoint ));
 286         }
 287         break;
 288
 289     case 0x0003:  /* Get next selector increment */
 290         AX_reg(context) = __AHINCR;
 291         break;
 292
 293     case 0x0004:  /* Lock selector (not supported) */
 294         AX_reg(context) = 0;  /* FIXME: is this a correct return value? */
 295         break;
 296
 297     case 0x0005:  /* Unlock selector (not supported) */
 298         AX_reg(context) = 0;  /* FIXME: is this a correct return value? */
 299         break;
 300
 301     case 0x0006:  /* Get selector base address */
 302         if (!(dw = GetSelectorBase( BX_reg(context) )))
 303         {
 304             AX_reg(context) = 0x8022;  /* invalid selector */
 305             SET_CFLAG(context);
 306         }
 307         else
 308         {
 309             CX_reg(context) = HIWORD(dw);
 310             DX_reg(context) = LOWORD(dw);
 311         }
 312         break;
 313
 314     case 0x0007:  /* Set selector base address */
 315         SetSelectorBase( BX_reg(context),
 316                          MAKELONG( DX_reg(context), CX_reg(context) ) );
 317         break;
 318
 319     case 0x0008:  /* Set selector limit */
 320         SetSelectorLimit( BX_reg(context),
 321                           MAKELONG( DX_reg(context), CX_reg(context) ) );
 322         break;
 323
 324     case 0x0009:  /* Set selector access rights */
 325         SelectorAccessRights( BX_reg(context), 1, CX_reg(context) );
 326         break;
 327
 328     case 0x000a:  /* Allocate selector alias */
 329         if (!(AX_reg(context) = AllocCStoDSAlias( BX_reg(context) )))
 330         {
 331             AX_reg(context) = 0x8011;  /* descriptor unavailable */
 332             SET_CFLAG(context);
 333         }
 334         break;
 335
 336     case 0x000b:  /* Get descriptor */
 337         {
 338             ldt_entry entry;
 339             LDT_GetEntry( SELECTOR_TO_ENTRY( BX_reg(context) ), &entry );
 340             /* FIXME: should use ES:EDI for 32-bit clients */
 341             LDT_EntryToBytes( PTR_SEG_OFF_TO_LIN( ES_reg(context),
 342                                                   DI_reg(context) ), &entry );
 343         }
 344         break;
 345
 346     case 0x000c:  /* Set descriptor */
 347         {
 348             ldt_entry entry;
 349             LDT_BytesToEntry( PTR_SEG_OFF_TO_LIN( ES_reg(context),
 350                                                   DI_reg(context) ), &entry );
 351             LDT_SetEntry( SELECTOR_TO_ENTRY( BX_reg(context) ), &entry );
 352         }
 353         break;
 354
 355     case 0x000d:  /* Allocate specific LDT descriptor */
 356         AX_reg(context) = 0x8011; /* descriptor unavailable */
 357         SET_CFLAG(context);
 358         break;
 359     case 0x0200: /* get real mode interrupt vector */
 360         FIXME(int31,"get realmode interupt vector(0x%02x) unimplemented.\n",
 361               BL_reg(context));
 362         SET_CFLAG(context);
 363         break;
 364     case 0x0201: /* set real mode interrupt vector */
 365         FIXME(int31, "set realmode interupt vector(0x%02x,0x%04x:0x%04x) unimplemented\n", BL_reg(context),CX_reg(context),DX_reg(context));
 366         SET_CFLAG(context);
 367         break;
 368     case 0x0204:  /* Get protected mode interrupt vector */
 369         dw = (DWORD)INT_GetHandler( BL_reg(context) );
 370         CX_reg(context) = HIWORD(dw);
 371         DX_reg(context) = LOWORD(dw);
 372         break;
 373
 374     case 0x0205:  /* Set protected mode interrupt vector */
 375         INT_SetHandler( BL_reg(context),
 376                         (FARPROC16)PTR_SEG_OFF_TO_SEGPTR( CX_reg(context),
 377                                                           DX_reg(context) ));
 378         break;
 379
 380     case 0x0300:  /* Simulate real mode interrupt */
 381         INT_DoRealModeInt( context );
 382         break;
 383
 384     case 0x0301:  /* Call real mode procedure with far return */
 385         {
 386             REALMODECALL *p = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(context), DI_reg(context) );
 387             FIXME(int31, "RealModeCall: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
 388                 p->eax, p->ebx, p->ecx, p->edx);
 389             FIXME(int31, "              ESI=%08lx EDI=%08lx ES=%04x DS=%04x CS:IP=%04x:%04x\n",
 390                 p->esi, p->edi, p->es, p->ds, p->cs, p->ip );
 391             SET_CFLAG(context);
 392         }
 393         break;
 394
 395     case 0x0302:  /* Call real mode procedure with interrupt return */
 396         {
 397             REALMODECALL *p = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(context), DI_reg(context) );
 398             FIXME(int31, "RealModeCallIret: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n", p->eax, p->ebx, p->ecx, p->edx);
 399             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 );
 400             SET_CFLAG(context);
 401         }
 402         break;
 403
 404     case 0x0303:  /* Allocate Real Mode Callback Address */
 405         {
 406             REALMODECALL *p = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(context), DI_reg(context) );
 407             FIXME(int31, "AllocRMCB: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n", p->eax, p->ebx, p->ecx, p->edx);
 408             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);
 409             FIXME(int31, "           Function to call: %04x:%04x\n",
 410                 (WORD)DS_reg(context), SI_reg(context) );
 411             SET_CFLAG(context);
 412         }
 413         break;
 414
 415     case 0x0304:  /* Free Real Mode Callback Address */
 416         {
 417             FIXME(int31, "FreeRMCB: callback address: %04x:%04x\n",
 418                   CX_reg(context), DX_reg(context));
 419             SET_CFLAG(context);
 420         }
 421         break;
 422
 423     case 0x0400:  /* Get DPMI version */
 424         {
 425             SYSTEM_INFO si;
 426
 427             GetSystemInfo(&si);
 428             AX_reg(context) = 0x005a;  /* DPMI version 0.90 */
 429             BX_reg(context) = 0x0005;  /* Flags: 32-bit, virtual memory */
 430             CL_reg(context) = si.wProcessorLevel;
 431             DX_reg(context) = 0x0102;  /* Master/slave interrupt controller base*/
 432             break;
 433         }
 434     case 0x0500:  /* Get free memory information */
 435         {
 436             MEMMANINFO mmi;
 437
 438             mmi.dwSize = sizeof(mmi);
 439             MemManInfo(&mmi);
 440             ptr = (BYTE *)PTR_SEG_OFF_TO_LIN(ES_reg(context),DI_reg(context));
 441             /* the layout is just the same as MEMMANINFO, but without
 442              * the dwSize entry.
 443              */
 444             memcpy(ptr,((char*)&mmi)+4,sizeof(mmi)-4);
 445             break;
 446         }
 447     case 0x0501:  /* Allocate memory block */
 448         if (!(ptr = (BYTE *)VirtualAlloc(NULL, MAKELONG(CX_reg(context), BX_reg(context)), MEM_COMMIT, PAGE_EXECUTE_READWRITE)))
 449         {
 450             AX_reg(context) = 0x8012;  /* linear memory not available */
 451             SET_CFLAG(context);
 452         }
 453         else
 454         {
 455             BX_reg(context) = SI_reg(context) = HIWORD(ptr);
 456             CX_reg(context) = DI_reg(context) = LOWORD(ptr);
 457         }
 458         break;
 459
 460     case 0x0502:  /* Free memory block */
 461         VirtualFree((void *)MAKELONG(DI_reg(context), SI_reg(context)), 0, MEM_RELEASE);
 462         break;
 463
 464     case 0x0503:  /* Resize memory block */
 465         if (!(ptr = (BYTE *)HeapReAlloc( GetProcessHeap(), 0,
 466                            (void *)MAKELONG(DI_reg(context),SI_reg(context)),
 467                                    MAKELONG(CX_reg(context),BX_reg(context)))))
 468         {
 469             AX_reg(context) = 0x8012;  /* linear memory not available */
 470             SET_CFLAG(context);
 471         }
 472         else
 473         {
 474             BX_reg(context) = SI_reg(context) = HIWORD(ptr);
 475             CX_reg(context) = DI_reg(context) = LOWORD(ptr);
 476         }
 477         break;
 478
 479     case 0x0600:  /* Lock linear region */
 480         break;  /* Just ignore it */
 481
 482     case 0x0601:  /* Unlock linear region */
 483         break;  /* Just ignore it */
 484
 485     case 0x0602:  /* Unlock real-mode region */
 486         break;  /* Just ignore it */
 487
 488     case 0x0603:  /* Lock real-mode region */
 489         break;  /* Just ignore it */
 490
 491     case 0x0604:  /* Get page size */
 492         BX_reg(context) = 0;
 493         CX_reg(context) = 4096;
 494         break;
 495
 496     case 0x0702:  /* Mark page as demand-paging candidate */
 497         break;  /* Just ignore it */
 498
 499     case 0x0703:  /* Discard page contents */
 500         break;  /* Just ignore it */
 501
 502      case 0x0800:  /* Physical address mapping */
 503          if(!(ptr=DOSMEM_MapRealToLinear(MAKELONG(CX_reg(context),BX_reg(context)))))
 504          {
 505              AX_reg(context) = 0x8021;
 506              SET_CFLAG(context);
 507          }
 508          else
 509          {
 510              BX_reg(context) = HIWORD(ptr);
 511              CX_reg(context) = LOWORD(ptr);
 512              RESET_CFLAG(context);
 513          }
 514          break;
 515
 516     default:
 517         INT_BARF( context, 0x31 );
 518         AX_reg(context) = 0x8001;  /* unsupported function */
 519         SET_CFLAG(context);
 520         break;
 521     }
 522 }