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/////////////////////////////////////////////////////////////////////////
// $Id: io_pro.cc,v 1.6 2001/10/03 13:10:37 bdenney Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2001 MandrakeSoft S.A.
//
// MandrakeSoft S.A.
// 43, rue d'Aboukir
// 75002 Paris - France
// http://www.linux-mandrake.com/
// http://www.mandrakesoft.com/
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#define NEED_CPU_REG_SHORTCUTS 1
#include "bochs.h"
#define LOG_THIS BX_CPU_THIS_PTR
Bit16u
BX_CPU_C::inp16(Bit16u addr)
{
Bit16u ret16;
if (BX_CPU_THIS_PTR cr0.pe && (BX_CPU_THIS_PTR eflags.vm || (CPL>IOPL))) {
if ( !BX_CPU_THIS_PTR allow_io(addr, 2) ) {
// BX_INFO(("cpu_inp16: GP0()!"));
exception(BX_GP_EXCEPTION, 0, 0);
return(0);
}
}
ret16 = BX_INP(addr, 2);
return( ret16 );
}
void
BX_CPU_C::outp16(Bit16u addr, Bit16u value)
{
/* If CPL <= IOPL, then all IO addresses are accessible.
* Otherwise, must check the IO permission map on >286.
* On the 286, there is no IO permissions map */
if (BX_CPU_THIS_PTR cr0.pe && (BX_CPU_THIS_PTR eflags.vm || (CPL>IOPL))) {
if ( !BX_CPU_THIS_PTR allow_io(addr, 2) ) {
// BX_INFO(("cpu_outp16: GP0()!"));
exception(BX_GP_EXCEPTION, 0, 0);
return;
}
}
BX_OUTP(addr, value, 2);
}
Bit32u
BX_CPU_C::inp32(Bit16u addr)
{
Bit32u ret32;
if (BX_CPU_THIS_PTR cr0.pe && (BX_CPU_THIS_PTR eflags.vm || (CPL>IOPL))) {
if ( !BX_CPU_THIS_PTR allow_io(addr, 4) ) {
// BX_INFO(("cpu_inp32: GP0()!"));
exception(BX_GP_EXCEPTION, 0, 0);
return(0);
}
}
ret32 = BX_INP(addr, 4);
return( ret32 );
}
void
BX_CPU_C::outp32(Bit16u addr, Bit32u value)
{
/* If CPL <= IOPL, then all IO addresses are accessible.
* Otherwise, must check the IO permission map on >286.
* On the 286, there is no IO permissions map */
if (BX_CPU_THIS_PTR cr0.pe && (BX_CPU_THIS_PTR eflags.vm || (CPL>IOPL))) {
if ( !BX_CPU_THIS_PTR allow_io(addr, 4) ) {
// BX_INFO(("cpu_outp32: GP0()!"));
exception(BX_GP_EXCEPTION, 0, 0);
return;
}
}
BX_OUTP(addr, value, 4);
}
Bit8u
BX_CPU_C::inp8(Bit16u addr)
{
Bit8u ret8;
if (BX_CPU_THIS_PTR cr0.pe && (BX_CPU_THIS_PTR eflags.vm || (CPL>IOPL))) {
if ( !BX_CPU_THIS_PTR allow_io(addr, 1) ) {
// BX_INFO(("cpu_inp8: GP0()!"));
exception(BX_GP_EXCEPTION, 0, 0);
return(0);
}
}
ret8 = BX_INP(addr, 1);
return( ret8 );
}
void
BX_CPU_C::outp8(Bit16u addr, Bit8u value)
{
/* If CPL <= IOPL, then all IO addresses are accessible.
* Otherwise, must check the IO permission map on >286.
* On the 286, there is no IO permissions map */
if (BX_CPU_THIS_PTR cr0.pe && (BX_CPU_THIS_PTR eflags.vm || (CPL>IOPL))) {
if ( !BX_CPU_THIS_PTR allow_io(addr, 1) ) {
// BX_INFO(("cpu_outp8: GP0()!"));
exception(BX_GP_EXCEPTION, 0, 0);
return;
}
}
BX_OUTP(addr, value, 1);
}
Boolean
BX_CPU_C::allow_io(Bit16u addr, unsigned len)
{
Bit16u io_base, permission16;
unsigned bit_index, i;
if (BX_CPU_THIS_PTR tr.cache.valid==0 || BX_CPU_THIS_PTR tr.cache.type!=9) {
BX_INFO(("allow_io(): TR doesn't point to a valid 32bit TSS"));
return(0);
}
if (BX_CPU_THIS_PTR tr.cache.u.tss386.limit_scaled < 103) {
BX_PANIC(("allow_io(): TR.limit < 103"));
}
access_linear(BX_CPU_THIS_PTR tr.cache.u.tss386.base + 102, 2, 0, BX_READ,
&io_base);
if (io_base <= 103) {
BX_INFO(("PE is %u", BX_CPU_THIS_PTR cr0.pe));
BX_INFO(("VM is %u", BX_CPU_THIS_PTR eflags.vm));
BX_INFO(("CPL is %u", CPL));
BX_INFO(("IOPL is %u", IOPL));
BX_INFO(("addr is %u", addr));
BX_INFO(("len is %u", len));
BX_PANIC(("allow_io(): TR:io_base <= 103"));
}
if (io_base > BX_CPU_THIS_PTR tr.cache.u.tss386.limit_scaled) {
BX_INFO(("allow_io(): CPL > IOPL: no IO bitmap defined #GP(0)"));
return(0);
}
access_linear(BX_CPU_THIS_PTR tr.cache.u.tss386.base + io_base + addr/8,
2, 0, BX_READ, &permission16);
bit_index = addr & 0x07;
permission16 >>= bit_index;
for (i=0; i<len; i++) {
if (permission16 & 0x01)
return(0);
permission16 >>= 1;
}
return(1);
}
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