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 "stddebug.h"
  19 #include "debug.h"
  20
  21 #define DOS_GET_DRIVE(reg) ((reg) ? (reg) - 1 : DRIVE_GetCurrentDrive())
  22
  23
  24 /* Structure for real-mode callbacks */
  25 typedef struct
  26 {
  27     DWORD edi;
  28     DWORD esi;
  29     DWORD ebp;
  30     DWORD reserved;
  31     DWORD ebx;
  32     DWORD edx;
  33     DWORD ecx;
  34     DWORD eax;
  35     WORD  flags;
  36     WORD  es;
  37     WORD  ds;
  38     WORD  fs;
  39     WORD  gs;
  40     WORD  ip;
  41     WORD  cs;
  42     WORD  sp;
  43     WORD  ss;
  44 } REALMODECALL;
  45
  46 extern void do_mscdex( CONTEXT *context );
  47
  48 /**********************************************************************
  49  *          INT_Int31Handler
  50  *
  51  * Handler for int 31h (DPMI).
  52  */
  53 void INT_Int31Handler( CONTEXT *context )
  54 {
  55     DWORD dw;
  56     BYTE *ptr;
  57
  58     RESET_CFLAG(context);
  59     switch(AX_reg(context))
  60     {
  61     case 0x0000:  /* Allocate LDT descriptors */
  62         if (!(AX_reg(context) = AllocSelectorArray( CX_reg(context) )))
  63         {
  64             AX_reg(context) = 0x8011;  /* descriptor unavailable */
  65             SET_CFLAG(context);
  66         }
  67         break;
  68
  69     case 0x0001:  /* Free LDT descriptor */
  70         if (FreeSelector( BX_reg(context) ))
  71         {
  72             AX_reg(context) = 0x8022;  /* invalid selector */
  73             SET_CFLAG(context);
  74         }
  75         else
  76         {
  77             /* If a segment register contains the selector being freed, */
  78             /* set it to zero. */
  79             if (!((DS_reg(context)^BX_reg(context)) & ~3)) DS_reg(context) = 0;
  80             if (!((ES_reg(context)^BX_reg(context)) & ~3)) ES_reg(context) = 0;
  81             if (!((FS_reg(context)^BX_reg(context)) & ~3)) FS_reg(context) = 0;
  82             if (!((GS_reg(context)^BX_reg(context)) & ~3)) GS_reg(context) = 0;
  83         }
  84         break;
  85
  86     case 0x0002:  /* Real mode segment to descriptor */
  87         {
  88             WORD entryPoint = 0;  /* KERNEL entry point for descriptor */
  89             switch(BX_reg(context))
  90             {
  91             case 0x0000: entryPoint = 183; break;  /* __0000H */
  92             case 0x0040: entryPoint = 193; break;  /* __0040H */
  93             case 0xa000: entryPoint = 174; break;  /* __A000H */
  94             case 0xb000: entryPoint = 181; break;  /* __B000H */
  95             case 0xb800: entryPoint = 182; break;  /* __B800H */
  96             case 0xc000: entryPoint = 195; break;  /* __C000H */
  97             case 0xd000: entryPoint = 179; break;  /* __D000H */
  98             case 0xe000: entryPoint = 190; break;  /* __E000H */
  99             case 0xf000: entryPoint = 194; break;  /* __F000H */
 100             default:
 101                 AX_reg(context) = DOSMEM_AllocSelector(BX_reg(context));
 102                 break;
 103             }
 104             if (entryPoint)
 105                 AX_reg(context) = LOWORD(MODULE_GetEntryPoint(
 106                                                  GetModuleHandle16( "KERNEL" ),
 107                                                  entryPoint ));
 108         }
 109         break;
 110
 111     case 0x0003:  /* Get next selector increment */
 112         AX_reg(context) = __AHINCR;
 113         break;
 114
 115     case 0x0004:  /* Lock selector (not supported) */
 116         AX_reg(context) = 0;  /* FIXME: is this a correct return value? */
 117         break;
 118
 119     case 0x0005:  /* Unlock selector (not supported) */
 120         AX_reg(context) = 0;  /* FIXME: is this a correct return value? */
 121         break;
 122
 123     case 0x0006:  /* Get selector base address */
 124         if (!(dw = GetSelectorBase( BX_reg(context) )))
 125         {
 126             AX_reg(context) = 0x8022;  /* invalid selector */
 127             SET_CFLAG(context);
 128         }
 129         else
 130         {
 131             CX_reg(context) = HIWORD(dw);
 132             DX_reg(context) = LOWORD(dw);
 133         }
 134         break;
 135
 136     case 0x0007:  /* Set selector base address */
 137         SetSelectorBase( BX_reg(context),
 138                          MAKELONG( DX_reg(context), CX_reg(context) ) );
 139         break;
 140
 141     case 0x0008:  /* Set selector limit */
 142         SetSelectorLimit( BX_reg(context),
 143                           MAKELONG( DX_reg(context), CX_reg(context) ) );
 144         break;
 145
 146     case 0x0009:  /* Set selector access rights */
 147         SelectorAccessRights( BX_reg(context), 1, CX_reg(context) );
 148         break;
 149
 150     case 0x000a:  /* Allocate selector alias */
 151         if (!(AX_reg(context) = AllocCStoDSAlias( BX_reg(context) )))
 152         {
 153             AX_reg(context) = 0x8011;  /* descriptor unavailable */
 154             SET_CFLAG(context);
 155         }
 156         break;
 157
 158     case 0x000b:  /* Get descriptor */
 159         {
 160             ldt_entry entry;
 161             LDT_GetEntry( SELECTOR_TO_ENTRY( BX_reg(context) ), &entry );
 162             /* FIXME: should use ES:EDI for 32-bit clients */
 163             LDT_EntryToBytes( PTR_SEG_OFF_TO_LIN( ES_reg(context),
 164                                                   DI_reg(context) ), &entry );
 165         }
 166         break;
 167
 168     case 0x000c:  /* Set descriptor */
 169         {
 170             ldt_entry entry;
 171             LDT_BytesToEntry( PTR_SEG_OFF_TO_LIN( ES_reg(context),
 172                                                   DI_reg(context) ), &entry );
 173             LDT_GetEntry( SELECTOR_TO_ENTRY( BX_reg(context) ), &entry );
 174         }
 175         break;
 176
 177     case 0x000d:  /* Allocate specific LDT descriptor */
 178         AX_reg(context) = 0x8011; /* descriptor unavailable */
 179         SET_CFLAG(context);
 180         break;
 181     case 0x0200: /* get real mode interrupt vector */
 182         fprintf(stdnimp,
 183                 "int31: get realmode interupt vector(0x%02x) unimplemented.\n",
 184                 BL_reg(context)
 185         );
 186         SET_CFLAG(context);
 187         break;
 188     case 0x0201: /* set real mode interrupt vector */
 189         fprintf(stdnimp,
 190                 "int31: set realmode interupt vector(0x%02x,0x%04x:0x%04x) unimplemented\n",
 191                 BL_reg(context),CX_reg(context),DX_reg(context)
 192         );
 193         SET_CFLAG(context);
 194         break;
 195     case 0x0204:  /* Get protected mode interrupt vector */
 196         dw = (DWORD)INT_GetHandler( BL_reg(context) );
 197         CX_reg(context) = HIWORD(dw);
 198         DX_reg(context) = LOWORD(dw);
 199         break;
 200
 201     case 0x0205:  /* Set protected mode interrupt vector */
 202         INT_SetHandler( BL_reg(context),
 203                         (FARPROC16)PTR_SEG_OFF_TO_SEGPTR( CX_reg(context),
 204                                                           DX_reg(context) ));
 205         break;
 206
 207     case 0x0300:  /* Simulate real mode interrupt
 208         *  Interrupt number is in BL, flags are in BH
 209         *  ES:DI points to real-mode call structure
 210         *  Currently we just print it out and return error.
 211         */
 212         RESET_CFLAG(context);
 213         {
 214             REALMODECALL *p = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(context), DI_reg(context) );
 215
 216             switch (BL_reg(context)) {
 217             case 0x2f:  /* int2f */
 218                 switch ((p->eax & 0xFF00)>>8) {
 219                 case 0x15:
 220                         /* MSCDEX hook */
 221                         AX_reg(context) = p->eax & 0xFFFF;
 222                         do_mscdex( context );
 223                         break;
 224                 default:
 225                         SET_CFLAG(context);
 226                         break;
 227                 }
 228                 break;
 229             case 0x21:  /* int21 */
 230                 switch ((p->eax & 0xFF00)>>8) {
 231                 case 0x65:
 232                     switch (p->eax & 0xFF) {
 233                     case 06:{/* get collate table */
 234                         char    *table;
 235                         /* ES:DI is a REALMODE pointer to 5 byte dosmem
 236                          * we fill that with 0x6, realmode pointer to collateTB
 237                          */
 238                         table = DOSMEM_MapRealToLinear(MAKELONG(p->edi,p->es));
 239                         *(BYTE*)table           = 0x06;
 240                         *(DWORD*)(table+1)      = DOSMEM_CollateTable;
 241
 242                         CX_reg(context)         = 258;/*FIXME: size of table?*/
 243                         break;
 244                     }
 245                     default:
 246                         SET_CFLAG(context);
 247                     }
 248                     break;
 249                 case 0x44:
 250                     switch (p->eax & 0xFF) {
 251                     case 0x0D:{/* generic block device request */
 252                         BYTE    *dataptr = DOSMEM_MapRealToLinear((p->ds)*0x1000+(p->edx & 0xFFFF));
 253                         int     drive = DOS_GET_DRIVE(p->ebx&0xFF);
 254
 255                         if ((p->ecx & 0xFF00) != 0x0800) {
 256                                 SET_CFLAG(context);
 257                                 break;
 258                         }
 259                         switch (p->ecx & 0xFF) {
 260                         case 0x66:{
 261
 262                             char    label[12],fsname[9],path[4];
 263                             DWORD   serial;
 264
 265                             strcpy(path,"x:\\");path[0]=drive+'A';
 266                             GetVolumeInformation32A(path,label,12,&serial,NULL,NULL,fsname,9);
 267                             *(WORD*)dataptr         = 0;
 268                             memcpy(dataptr+2,&serial,4);
 269                             memcpy(dataptr+6,label  ,11);
 270                             memcpy(dataptr+17,fsname,8);
 271                             break;
 272                         }
 273                         case 0x60:      /* get device parameters */
 274                                         /* used by defrag.exe of win95 */
 275                             memset(dataptr, 0, 0x26);
 276                             dataptr[0] = 0x04;
 277                             dataptr[6] = 0; /* media type */
 278                             if (drive > 1) {
 279                                 dataptr[1] = 0x05; /* fixed disk */
 280                                 setword(&dataptr[2], 0x01); /* non removable */
 281                                 setword(&dataptr[4], 0x300); /* # of cylinders */
 282                             } else {
 283                                 dataptr[1] = 0x07; /* block dev, floppy */
 284                                 setword(&dataptr[2], 0x02); /* removable */
 285                                 setword(&dataptr[4], 80); /* # of cylinders */
 286                             }
 287                             CreateBPB(drive, &dataptr[7]);
 288                             break;
 289                         default:
 290                             SET_CFLAG(context);
 291                             break;
 292                         }
 293                     }
 294                         break;
 295                     default:
 296                         SET_CFLAG(context);
 297                         break;
 298                     }
 299                     break;
 300                 default:
 301                     SET_CFLAG(context);
 302                     break;
 303                 }
 304                 break;
 305             default:
 306                 SET_CFLAG(context);
 307                 break;
 308             }
 309             if (EFL_reg(context)&1) {
 310                 fprintf(stdnimp,
 311                     "RealModeInt %02x: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n"
 312                     "                ESI=%08lx EDI=%08lx ES=%04x DS=%04x\n",
 313                     BL_reg(context), p->eax, p->ebx, p->ecx, p->edx,
 314                     p->esi, p->edi, p->es, p->ds
 315                 );
 316             }
 317         }
 318         break;
 319     case 0x0301:  /* Call real mode procedure with far return */
 320         {
 321             REALMODECALL *p = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(context), DI_reg(context) );
 322             fprintf(stdnimp,
 323                     "RealModeCall: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n"
 324                     "              ESI=%08lx EDI=%08lx ES=%04x DS=%04x CS:IP=%04x:%04x\n",
 325                     p->eax, p->ebx, p->ecx, p->edx,
 326                     p->esi, p->edi, p->es, p->ds, p->cs, p->ip );
 327             SET_CFLAG(context);
 328         }
 329         break;
 330
 331     case 0x0302:  /* Call real mode procedure with interrupt return */
 332         {
 333             REALMODECALL *p = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(context), DI_reg(context) );
 334             fprintf(stdnimp,
 335                     "RealModeCallIret: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n"
 336                     "                  ESI=%08lx EDI=%08lx ES=%04x DS=%04x CS:IP=%04x:%04x\n",
 337                     p->eax, p->ebx, p->ecx, p->edx,
 338                     p->esi, p->edi, p->es, p->ds, p->cs, p->ip );
 339             SET_CFLAG(context);
 340         }
 341         break;
 342
 343     case 0x0303:  /* Allocate Real Mode Callback Address */
 344         {
 345             REALMODECALL *p = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(context), DI_reg(context) );
 346             fprintf(stdnimp,
 347                     "AllocRMCB: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n"
 348                     "           ESI=%08lx EDI=%08lx ES=%04x DS=%04x CS:IP=%04x:%04x\n"
 349                     "   Function to call: %04x:%04x\n",
 350                     p->eax, p->ebx, p->ecx, p->edx,
 351                     p->esi, p->edi, p->es, p->ds, p->cs, p->ip,
 352                     (WORD)DS_reg(context), SI_reg(context) );
 353             SET_CFLAG(context);
 354         }
 355         break;
 356
 357     case 0x0400:  /* Get DPMI version */
 358         {
 359             SYSTEM_INFO si;
 360
 361             GetSystemInfo(&si);
 362             AX_reg(context) = 0x005a;  /* DPMI version 0.90 */
 363             BX_reg(context) = 0x0005;  /* Flags: 32-bit, virtual memory */
 364             CL_reg(context) = si.wProcessorLevel;
 365             DX_reg(context) = 0x0102;  /* Master/slave interrupt controller base*/
 366             break;
 367         }
 368     case 0x0500:  /* Get free memory information */
 369         {
 370             MEMMANINFO mmi;
 371
 372             mmi.dwSize = sizeof(mmi);
 373             MemManInfo(&mmi);
 374             ptr = (BYTE *)PTR_SEG_OFF_TO_LIN(ES_reg(context),DI_reg(context));
 375             /* the layout is just the same as MEMMANINFO, but without
 376              * the dwSize entry.
 377              */
 378             memcpy(ptr,((char*)&mmi)+4,sizeof(mmi)-4);
 379             break;
 380         }
 381     case 0x0501:  /* Allocate memory block */
 382         if (!(ptr = (BYTE *)HeapAlloc( SystemHeap, 0,MAKELONG( CX_reg(context),
 383                                                            BX_reg(context) ))))
 384         {
 385             AX_reg(context) = 0x8012;  /* linear memory not available */
 386             SET_CFLAG(context);
 387         }
 388         else
 389         {
 390             BX_reg(context) = SI_reg(context) = HIWORD(ptr);
 391             CX_reg(context) = DI_reg(context) = LOWORD(ptr);
 392         }
 393         break;
 394
 395     case 0x0502:  /* Free memory block */
 396         HeapFree( SystemHeap, 0,
 397                   (void *)MAKELONG( DI_reg(context), SI_reg(context) ) );
 398         break;
 399
 400     case 0x0503:  /* Resize memory block */
 401         if (!(ptr = (BYTE *)HeapReAlloc( SystemHeap, 0,
 402                            (void *)MAKELONG(DI_reg(context),SI_reg(context)),
 403                                    MAKELONG(CX_reg(context),BX_reg(context)))))
 404         {
 405             AX_reg(context) = 0x8012;  /* linear memory not available */
 406             SET_CFLAG(context);
 407         }
 408         else
 409         {
 410             BX_reg(context) = SI_reg(context) = HIWORD(ptr);
 411             CX_reg(context) = DI_reg(context) = LOWORD(ptr);
 412         }
 413         break;
 414
 415     case 0x0600:  /* Lock linear region */
 416         break;  /* Just ignore it */
 417
 418     case 0x0601:  /* Unlock linear region */
 419         break;  /* Just ignore it */
 420
 421     case 0x0602:  /* Unlock real-mode region */
 422         break;  /* Just ignore it */
 423
 424     case 0x0603:  /* Lock real-mode region */
 425         break;  /* Just ignore it */
 426
 427     case 0x0604:  /* Get page size */
 428         BX_reg(context) = 0;
 429         CX_reg(context) = 4096;
 430         break;
 431
 432     case 0x0702:  /* Mark page as demand-paging candidate */
 433         break;  /* Just ignore it */
 434
 435     case 0x0703:  /* Discard page contents */
 436         break;  /* Just ignore it */
 437
 438     default:
 439         INT_BARF( context, 0x31 );
 440         AX_reg(context) = 0x8001;  /* unsupported function */
 441         SET_CFLAG(context);
 442         break;
 443     }
 444 }