/* * DPMI 0.9 emulation * * Copyright 1995 Alexandre Julliard */ #include #include #include #include #include "windows.h" #include "ldt.h" #include "module.h" #include "registers.h" #include "wine.h" #include "miscemu.h" #include "stddebug.h" /* #define DEBUG_INT */ #include "debug.h" /* Structure for real-mode callbacks */ typedef struct { DWORD edi; DWORD esi; DWORD ebp; DWORD reserved; DWORD ebx; DWORD edx; DWORD ecx; DWORD eax; WORD flags; WORD es; WORD ds; WORD fs; WORD gs; WORD ip; WORD cs; WORD sp; WORD ss; } REALMODECALL; extern void do_mscdex( SIGCONTEXT *context ); /********************************************************************** * INT_Int31Handler * * Handler for int 31h (DPMI). */ void INT_Int31Handler( SIGCONTEXT context ) { DWORD dw; BYTE *ptr; RESET_CFLAG(&context); switch(AX_reg(&context)) { case 0x0000: /* Allocate LDT descriptors */ if (!(AX_reg(&context) = AllocSelectorArray( CX_reg(&context) ))) { AX_reg(&context) = 0x8011; /* descriptor unavailable */ SET_CFLAG(&context); } break; case 0x0001: /* Free LDT descriptor */ if (FreeSelector( BX_reg(&context) )) { AX_reg(&context) = 0x8022; /* invalid selector */ SET_CFLAG(&context); } break; case 0x0002: /* Real mode segment to descriptor */ { WORD entryPoint = 0; /* KERNEL entry point for descriptor */ switch(BX_reg(&context)) { case 0x0000: entryPoint = 183; break; /* __0000H */ case 0x0040: entryPoint = 193; break; /* __0040H */ case 0xa000: entryPoint = 174; break; /* __A000H */ case 0xb000: entryPoint = 181; break; /* __B000H */ case 0xb800: entryPoint = 182; break; /* __B800H */ case 0xc000: entryPoint = 195; break; /* __C000H */ case 0xd000: entryPoint = 179; break; /* __D000H */ case 0xe000: entryPoint = 190; break; /* __E000H */ case 0xf000: entryPoint = 194; break; /* __F000H */ default: fprintf( stderr, "DPMI: real-mode seg to descriptor %04x not possible\n", BX_reg(&context) ); AX_reg(&context) = 0x8011; SET_CFLAG(&context); break; } if (entryPoint) AX_reg(&context) = LOWORD(MODULE_GetEntryPoint( GetModuleHandle( "KERNEL" ), entryPoint )); } break; case 0x0003: /* Get next selector increment */ AX_reg(&context) = __AHINCR; break; case 0x0004: /* Lock selector (not supported) */ AX_reg(&context) = 0; /* FIXME: is this a correct return value? */ break; case 0x0005: /* Unlock selector (not supported) */ AX_reg(&context) = 0; /* FIXME: is this a correct return value? */ break; case 0x0006: /* Get selector base address */ if (!(dw = GetSelectorBase( BX_reg(&context) ))) { AX_reg(&context) = 0x8022; /* invalid selector */ SET_CFLAG(&context); } else { CX_reg(&context) = HIWORD(dw); DX_reg(&context) = LOWORD(dw); } break; case 0x0007: /* Set selector base address */ SetSelectorBase( BX_reg(&context), MAKELONG( DX_reg(&context), CX_reg(&context) ) ); break; case 0x0008: /* Set selector limit */ SetSelectorLimit( BX_reg(&context), MAKELONG( DX_reg(&context), CX_reg(&context) ) ); break; case 0x0009: /* Set selector access rights */ SelectorAccessRights( BX_reg(&context), 1, CX_reg(&context) ); case 0x000a: /* Allocate selector alias */ if (!(AX_reg(&context) = AllocCStoDSAlias( BX_reg(&context) ))) { AX_reg(&context) = 0x8011; /* descriptor unavailable */ SET_CFLAG(&context); } break; case 0x000b: /* Get descriptor */ { ldt_entry entry; LDT_GetEntry( SELECTOR_TO_ENTRY( BX_reg(&context) ), &entry ); /* FIXME: should use ES:EDI for 32-bit clients */ LDT_EntryToBytes( PTR_SEG_OFF_TO_LIN( ES_reg(&context), DI_reg(&context) ), &entry ); } break; case 0x000c: /* Set descriptor */ { ldt_entry entry; LDT_BytesToEntry( PTR_SEG_OFF_TO_LIN( ES_reg(&context), DI_reg(&context) ), &entry ); LDT_GetEntry( SELECTOR_TO_ENTRY( BX_reg(&context) ), &entry ); } break; case 0x000d: /* Allocate specific LDT descriptor */ AX_reg(&context) = 0x8011; /* descriptor unavailable */ SET_CFLAG(&context); break; case 0x0204: /* Get protected mode interrupt vector */ dw = (DWORD)INT_GetHandler( BL_reg(&context) ); CX_reg(&context) = HIWORD(dw); DX_reg(&context) = LOWORD(dw); break; case 0x0205: /* Set protected mode interrupt vector */ INT_SetHandler( BL_reg(&context), PTR_SEG_OFF_TO_SEGPTR(CX_reg(&context),DX_reg(&context))); break; case 0x0300: /* Simulate real mode interrupt * Interrupt number is in BL, flags are in BH * ES:DI points to real-mode call structure * Currently we just print it out and return error. */ { REALMODECALL *p = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(&context), DI_reg(&context) ); fprintf(stdnimp, "RealModeInt %02x: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n" " ESI=%08lx EDI=%08lx ES=%04x DS=%04x\n", BL_reg(&context), p->eax, p->ebx, p->ecx, p->edx, p->esi, p->edi, p->es, p->ds ); /* Compton's 1995 encyclopedia does its MSCDEX calls through * this interrupt. Why? Who knows... */ if ((BL_reg(&context) == 0x2f) && ((p->eax & 0xFF00) == 0x1500)) { SIGCONTEXT context2; EAX_reg(&context2) = p->eax; EBX_reg(&context2) = p->ebx; ECX_reg(&context2) = p->ecx; EDX_reg(&context2) = p->edx; ES_reg(&context2) = p->es; do_mscdex(&context2); p->eax = EAX_reg(&context2); p->ebx = EBX_reg(&context2); p->ecx = ECX_reg(&context2); p->edx = EDX_reg(&context2); } else SET_CFLAG(&context); } break; case 0x0301: /* Call real mode procedure with far return */ { REALMODECALL *p = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(&context), DI_reg(&context) ); fprintf(stdnimp, "RealModeCall: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n" " ESI=%08lx EDI=%08lx ES=%04x DS=%04x CS:IP=%04x:%04x\n", p->eax, p->ebx, p->ecx, p->edx, p->esi, p->edi, p->es, p->ds, p->cs, p->ip ); SET_CFLAG(&context); } break; case 0x0302: /* Call real mode procedure with interrupt return */ { REALMODECALL *p = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( ES_reg(&context), DI_reg(&context) ); fprintf(stdnimp, "RealModeCallIret: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n" " ESI=%08lx EDI=%08lx ES=%04x DS=%04x CS:IP=%04x:%04x\n", p->eax, p->ebx, p->ecx, p->edx, p->esi, p->edi, p->es, p->ds, p->cs, p->ip ); SET_CFLAG(&context); } break; case 0x0400: /* Get DPMI version */ AX_reg(&context) = 0x005a; /* DPMI version 0.90 */ BX_reg(&context) = 0x0005; /* Flags: 32-bit, virtual memory */ CL_reg(&context) = runtime_cpu (); DX_reg(&context) = 0x0102; /* Master/slave interrupt controller base*/ break; case 0x0500: /* Get free memory information */ ptr = (BYTE *)PTR_SEG_OFF_TO_LIN( ES_reg(&context), DI_reg(&context) ); *(DWORD *)ptr = 0x00ff0000; /* Largest block available */ memset( ptr + 4, 0xff, 0x2c ); /* No other information supported */ break; case 0x0501: /* Allocate memory block */ if (!(ptr = (BYTE *)malloc( MAKELONG( CX_reg(&context), BX_reg(&context) ) ))) { AX_reg(&context) = 0x8012; /* linear memory not available */ SET_CFLAG(&context); } else { BX_reg(&context) = SI_reg(&context) = HIWORD(ptr); CX_reg(&context) = DI_reg(&context) = LOWORD(ptr); } break; case 0x0502: /* Free memory block */ free( (void *)MAKELONG( DI_reg(&context), SI_reg(&context) ) ); break; case 0x0503: /* Resize memory block */ if (!(ptr = (BYTE *)realloc( (void *)MAKELONG(DI_reg(&context),SI_reg(&context)), MAKELONG(CX_reg(&context),BX_reg(&context))))) { AX_reg(&context) = 0x8012; /* linear memory not available */ SET_CFLAG(&context); } else { BX_reg(&context) = SI_reg(&context) = HIWORD(ptr); CX_reg(&context) = DI_reg(&context) = LOWORD(ptr); } break; case 0x0600: /* Lock linear region */ break; /* Just ignore it */ case 0x0601: /* Unlock linear region */ break; /* Just ignore it */ case 0x0602: /* Unlock real-mode region */ break; /* Just ignore it */ case 0x0603: /* Lock real-mode region */ break; /* Just ignore it */ case 0x0604: /* Get page size */ BX_reg(&context) = 0; CX_reg(&context) = 4096; break; case 0x0702: /* Mark page as demand-paging candidate */ break; /* Just ignore it */ case 0x0703: /* Discard page contents */ break; /* Just ignore it */ default: INT_BARF( &context, 0x31 ); AX_reg(&context) = 0x8001; /* unsupported function */ SET_CFLAG(&context); break; } }