miscemu/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 <stdlib.h>
  10 #include <string.h>
  11 #include "windows.h"
  12 #include "ldt.h"
  13 #include "module.h"
  14 #include "registers.h"
  15 #include "wine.h"
  16 #include "miscemu.h"
  17 #include "stddebug.h"
  18 /* #define DEBUG_INT */
  19 #include "debug.h"
  20
  21
  22 /* Structure for real-mode callbacks */
  23 typedef struct
  24 {
  25     DWORD edi;
  26     DWORD esi;
  27     DWORD ebp;
  28     DWORD reserved;
  29     DWORD ebx;
  30     DWORD edx;
  31     DWORD ecx;
  32     DWORD eax;
  33     WORD  flags;
  34     WORD  es;
  35     WORD  ds;
  36     WORD  fs;
  37     WORD  gs;
  38     WORD  ip;
  39     WORD  cs;
  40     WORD  sp;
  41     WORD  ss;
  42 } REALMODECALL;
  43
  44 extern void do_mscdex(struct sigcontext_struct *context);
  45
  46 /**********************************************************************
  47  *          INT_Int31Handler
  48  *
  49  * Handler for int 31h (DPMI).
  50  */
  51 void INT_Int31Handler( struct sigcontext_struct context )
  52 {
  53     DWORD dw;
  54     BYTE *ptr;
  55
  56     RESET_CFLAG(&context);
  57     switch(AX_reg(&context))
  58     {
  59     case 0x0000:  /* Allocate LDT descriptors */
  60         if (!(AX_reg(&context) = AllocSelectorArray( CX_reg(&context) )))
  61         {
  62             AX_reg(&context) = 0x8011;  /* descriptor unavailable */
  63             SET_CFLAG(&context);
  64         }
  65         break;
  66
  67     case 0x0001:  /* Free LDT descriptor */
  68         if (FreeSelector( BX_reg(&context) ))
  69         {
  70             AX_reg(&context) = 0x8022;  /* invalid selector */
  71             SET_CFLAG(&context);
  72         }
  73         break;
  74
  75     case 0x0002:  /* Real mode segment to descriptor */
  76         {
  77             WORD entryPoint = 0;  /* KERNEL entry point for descriptor */
  78             switch(BX_reg(&context))
  79             {
  80             case 0x0000: entryPoint = 183; break;  /* __0000H */
  81             case 0x0040: entryPoint = 193; break;  /* __0040H */
  82             case 0xa000: entryPoint = 174; break;  /* __A000H */
  83             case 0xb000: entryPoint = 181; break;  /* __B000H */
  84             case 0xb800: entryPoint = 182; break;  /* __B800H */
  85             case 0xc000: entryPoint = 195; break;  /* __C000H */
  86             case 0xd000: entryPoint = 179; break;  /* __D000H */
  87             case 0xe000: entryPoint = 190; break;  /* __E000H */
  88             case 0xf000: entryPoint = 194; break;  /* __F000H */
  89             default:
  90                 fprintf( stderr, "DPMI: real-mode seg to descriptor %04x not possible\n",
  91                          BX_reg(&context) );
  92                 AX_reg(&context) = 0x8011;
  93                 SET_CFLAG(&context);
  94                 break;
  95             }
  96             if (entryPoint)
  97                 AX_reg(&context) = LOWORD(MODULE_GetEntryPoint(
  98                                                    GetModuleHandle( "KERNEL" ),
  99                                                    entryPoint ));
 100         }
 101         break;
 102
 103     case 0x0003:  /* Get next selector increment */
 104         AX_reg(&context) = __AHINCR;
 105         break;
 106
 107     case 0x0004:  /* Lock selector (not supported) */
 108         AX_reg(&context) = 0;  /* FIXME: is this a correct return value? */
 109         break;
 110
 111     case 0x0005:  /* Unlock selector (not supported) */
 112         AX_reg(&context) = 0;  /* FIXME: is this a correct return value? */
 113         break;
 114
 115     case 0x0006:  /* Get selector base address */
 116         if (!(dw = GetSelectorBase( BX_reg(&context) )))
 117         {
 118             AX_reg(&context) = 0x8022;  /* invalid selector */
 119             SET_CFLAG(&context);
 120         }
 121         else
 122         {
 123             CX_reg(&context) = HIWORD(dw);
 124             DX_reg(&context) = LOWORD(dw);
 125         }
 126         break;
 127
 128     case 0x0007:  /* Set selector base address */
 129         SetSelectorBase( BX_reg(&context),
 130                          MAKELONG( DX_reg(&context), CX_reg(&context) ) );
 131         break;
 132
 133     case 0x0008:  /* Set selector limit */
 134         SetSelectorLimit( BX_reg(&context),
 135                           MAKELONG( DX_reg(&context), CX_reg(&context) ) );
 136         break;
 137
 138     case 0x0009:  /* Set selector access rights */
 139         SelectorAccessRights( BX_reg(&context), 1, CX_reg(&context) );
 140
 141     case 0x000a:  /* Allocate selector alias */
 142         if (!(AX_reg(&context) = AllocCStoDSAlias( BX_reg(&context) )))
 143         {
 144             AX_reg(&context) = 0x8011;  /* descriptor unavailable */
 145             SET_CFLAG(&context);
 146         }
 147         break;
 148
 149     case 0x000b:  /* Get descriptor */
 150         {
 151             ldt_entry entry;
 152             LDT_GetEntry( SELECTOR_TO_ENTRY( BX_reg(&context) ), &entry );
 153             /* FIXME: should use ES:EDI for 32-bit clients */
 154             LDT_EntryToBytes( PTR_SEG_OFF_TO_LIN( ES_reg(&context),
 155                                                   DI_reg(&context) ), &entry );
 156         }
 157         break;
 158
 159     case 0x000c:  /* Set descriptor */
 160         {
 161             ldt_entry entry;
 162             LDT_BytesToEntry( PTR_SEG_OFF_TO_LIN( ES_reg(&context),
 163                                                   DI_reg(&context) ), &entry );
 164             LDT_GetEntry( SELECTOR_TO_ENTRY( BX_reg(&context) ), &entry );
 165         }
 166         break;
 167
 168     case 0x000d:  /* Allocate specific LDT descriptor */
 169         AX_reg(&context) = 0x8011; /* descriptor unavailable */
 170         SET_CFLAG(&context);
 171         break;
 172
 173     case 0x0204:  /* Get protected mode interrupt vector */
 174         dw = (DWORD)INT_GetHandler( BL_reg(&context) );
 175         CX_reg(&context) = HIWORD(dw);
 176         DX_reg(&context) = LOWORD(dw);
 177         break;
 178
 179     case 0x0205:  /* Set protected mode interrupt vector */
 180         INT_SetHandler( BL_reg(&context),
 181                      PTR_SEG_OFF_TO_SEGPTR(CX_reg(&context),DX_reg(&context)));
 182         break;
 183
 184     case 0x0300:  /* Simulate real mode interrupt
 185         *  Interrupt number is in BL, flags are in BH
 186         *  ES:DI points to real-mode call structure
 187         *  Currently we just print it out and return error.
 188         */
 189         {
 190             REALMODECALL *p = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(&context), DI_reg(&context) );
 191             fprintf(stdnimp,
 192                     "RealModeInt %02x: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n"
 193                     "                ESI=%08lx EDI=%08lx ES=%04x DS=%04x\n",
 194                     BL_reg(&context), p->eax, p->ebx, p->ecx, p->edx,
 195                     p->esi, p->edi, p->es, p->ds );
 196
 197             /* Compton's 1995 encyclopedia does its MSCDEX calls through
 198              * this interrupt.  Why?  Who knows...
 199              */
 200             if ((BL_reg(&context) == 0x2f) && ((p->eax & 0xFF00) == 0x1500))
 201             {
 202                 struct sigcontext_struct context2;
 203                 EAX_reg(&context2) = p->eax;
 204                 EBX_reg(&context2) = p->ebx;
 205                 ECX_reg(&context2) = p->ecx;
 206                 EDX_reg(&context2) = p->edx;
 207                 ES_reg(&context2) = p->es;
 208                 do_mscdex(&context2);
 209                 p->eax = EAX_reg(&context2);
 210                 p->ebx = EBX_reg(&context2);
 211                 p->ecx = ECX_reg(&context2);
 212                 p->edx = EDX_reg(&context2);
 213             }
 214             else SET_CFLAG(&context);
 215         }
 216         break;
 217
 218     case 0x0301:  /* Call real mode procedure with far return */
 219         {
 220             REALMODECALL *p = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(&context), DI_reg(&context) );
 221             fprintf(stdnimp,
 222                     "RealModeCall: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n"
 223                     "              ESI=%08lx EDI=%08lx ES=%04x DS=%04x CS:IP=%04x:%04x\n",
 224                     p->eax, p->ebx, p->ecx, p->edx,
 225                     p->esi, p->edi, p->es, p->ds, p->cs, p->ip );
 226             SET_CFLAG(&context);
 227         }
 228         break;
 229
 230     case 0x0302:  /* Call real mode procedure with interrupt return */
 231         {
 232             REALMODECALL *p = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(&context), DI_reg(&context) );
 233             fprintf(stdnimp,
 234                     "RealModeCallIret: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n"
 235                     "                  ESI=%08lx EDI=%08lx ES=%04x DS=%04x CS:IP=%04x:%04x\n",
 236                     p->eax, p->ebx, p->ecx, p->edx,
 237                     p->esi, p->edi, p->es, p->ds, p->cs, p->ip );
 238             SET_CFLAG(&context);
 239         }
 240         break;
 241
 242     case 0x0400:  /* Get DPMI version */
 243         AX_reg(&context) = 0x005a;  /* DPMI version 0.90 */
 244         BX_reg(&context) = 0x0005;  /* Flags: 32-bit, virtual memory */
 245         CL_reg(&context) = runtime_cpu ();
 246         DX_reg(&context) = 0x0102;  /* Master/slave interrupt controller base*/
 247         break;
 248
 249     case 0x0500:  /* Get free memory information */
 250         ptr = (BYTE *)PTR_SEG_OFF_TO_LIN( ES_reg(&context), DI_reg(&context) );
 251         *(DWORD *)ptr = 0x00ff0000; /* Largest block available */
 252         memset( ptr + 4, 0xff, 0x2c );  /* No other information supported */
 253         break;
 254
 255     case 0x0501:  /* Allocate memory block */
 256         if (!(ptr = (BYTE *)malloc( MAKELONG( CX_reg(&context),
 257                                               BX_reg(&context) ) )))
 258         {
 259             AX_reg(&context) = 0x8012;  /* linear memory not available */
 260             SET_CFLAG(&context);
 261         }
 262         else
 263         {
 264             BX_reg(&context) = SI_reg(&context) = HIWORD(ptr);
 265             CX_reg(&context) = DI_reg(&context) = LOWORD(ptr);
 266         }
 267         break;
 268
 269     case 0x0502:  /* Free memory block */
 270         free( (void *)MAKELONG( DI_reg(&context), SI_reg(&context) ) );
 271         break;
 272
 273     case 0x0503:  /* Resize memory block */
 274         if (!(ptr = (BYTE *)realloc( (void *)MAKELONG(DI_reg(&context),SI_reg(&context)),
 275                                      MAKELONG(CX_reg(&context),BX_reg(&context)))))
 276         {
 277             AX_reg(&context) = 0x8012;  /* linear memory not available */
 278             SET_CFLAG(&context);
 279         }
 280         else
 281         {
 282             BX_reg(&context) = SI_reg(&context) = HIWORD(ptr);
 283             CX_reg(&context) = DI_reg(&context) = LOWORD(ptr);
 284         }
 285         break;
 286
 287     case 0x0600:  /* Lock linear region */
 288         break;  /* Just ignore it */
 289
 290     case 0x0601:  /* Unlock linear region */
 291         break;  /* Just ignore it */
 292
 293     case 0x0602:  /* Unlock real-mode region */
 294         break;  /* Just ignore it */
 295
 296     case 0x0603:  /* Lock real-mode region */
 297         break;  /* Just ignore it */
 298
 299     case 0x0604:  /* Get page size */
 300         BX_reg(&context) = 0;
 301         CX_reg(&context) = 4096;
 302         break;
 303
 304     case 0x0702:  /* Mark page as demand-paging candidate */
 305         break;  /* Just ignore it */
 306
 307     case 0x0703:  /* Discard page contents */
 308         break;  /* Just ignore it */
 309
 310     default:
 311         INT_BARF( &context, 0x31 );
 312         AX_reg(&context) = 0x8001;  /* unsupported function */
 313         SET_CFLAG(&context);
 314         break;
 315     }
 316 }