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Sweden-Number/miscemu/dpmi.c

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/*
* DPMI 0.9 emulation
*
* Copyright 1995 Alexandre Julliard
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#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(struct sigcontext_struct *context);
/**********************************************************************
* INT_Int31Handler
*
* Handler for int 31h (DPMI).
*/
void INT_Int31Handler( struct sigcontext_struct 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),
(SEGPTR)MAKELONG( DX_reg(&context), CX_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))
{
struct sigcontext_struct 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;
}
}
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