155 lines
4.4 KiB
C++
155 lines
4.4 KiB
C++
/////////////////////////////////////////////////////////////////////////
|
|
// $Id: io_pro.cc,v 1.30 2008-03-29 18:18:07 sshwarts 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"
|
|
#include "cpu.h"
|
|
#define LOG_THIS BX_CPU_THIS_PTR
|
|
|
|
#include "iodev/iodev.h"
|
|
|
|
Bit16u BX_CPP_AttrRegparmN(1)
|
|
BX_CPU_C::inp16(Bit16u addr)
|
|
{
|
|
if (! BX_CPU_THIS_PTR allow_io(addr, 2)) {
|
|
BX_DEBUG(("inp16(): I/O access not allowed !"));
|
|
exception(BX_GP_EXCEPTION, 0, 0);
|
|
}
|
|
|
|
Bit16u ret16 = BX_INP(addr, 2);
|
|
return ret16;
|
|
}
|
|
|
|
void BX_CPP_AttrRegparmN(2)
|
|
BX_CPU_C::outp16(Bit16u addr, Bit16u value)
|
|
{
|
|
if (! BX_CPU_THIS_PTR allow_io(addr, 2)) {
|
|
BX_DEBUG(("outp16(): I/O access not allowed !"));
|
|
exception(BX_GP_EXCEPTION, 0, 0);
|
|
}
|
|
|
|
BX_OUTP(addr, value, 2);
|
|
}
|
|
|
|
Bit32u BX_CPP_AttrRegparmN(1)
|
|
BX_CPU_C::inp32(Bit16u addr)
|
|
{
|
|
if (! BX_CPU_THIS_PTR allow_io(addr, 4)) {
|
|
BX_DEBUG(("inp32(): I/O access not allowed !"));
|
|
exception(BX_GP_EXCEPTION, 0, 0);
|
|
}
|
|
|
|
Bit32u ret32 = BX_INP(addr, 4);
|
|
return ret32;
|
|
}
|
|
|
|
void BX_CPP_AttrRegparmN(2)
|
|
BX_CPU_C::outp32(Bit16u addr, Bit32u value)
|
|
{
|
|
if (! BX_CPU_THIS_PTR allow_io(addr, 4)) {
|
|
BX_DEBUG(("outp32(): I/O access not allowed !"));
|
|
exception(BX_GP_EXCEPTION, 0, 0);
|
|
}
|
|
|
|
BX_OUTP(addr, value, 4);
|
|
}
|
|
|
|
Bit8u BX_CPP_AttrRegparmN(1)
|
|
BX_CPU_C::inp8(Bit16u addr)
|
|
{
|
|
if (! BX_CPU_THIS_PTR allow_io(addr, 1)) {
|
|
BX_DEBUG(("inp8(): I/O access not allowed !"));
|
|
exception(BX_GP_EXCEPTION, 0, 0);
|
|
}
|
|
|
|
Bit8u ret8 = BX_INP(addr, 1);
|
|
return ret8;
|
|
}
|
|
|
|
void BX_CPP_AttrRegparmN(2)
|
|
BX_CPU_C::outp8(Bit16u addr, Bit8u value)
|
|
{
|
|
if (! BX_CPU_THIS_PTR allow_io(addr, 1)) {
|
|
BX_DEBUG(("outp8(): I/O access not allowed !"));
|
|
exception(BX_GP_EXCEPTION, 0, 0);
|
|
}
|
|
|
|
BX_OUTP(addr, value, 1);
|
|
}
|
|
|
|
bx_bool BX_CPU_C::allow_io(Bit16u addr, unsigned len)
|
|
{
|
|
Bit16u io_base, permission16;
|
|
|
|
/* 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.get_PE() && (BX_CPU_THIS_PTR get_VM() || (CPL>BX_CPU_THIS_PTR get_IOPL())))
|
|
{
|
|
if (BX_CPU_THIS_PTR tr.cache.valid==0 ||
|
|
BX_CPU_THIS_PTR tr.cache.type != BX_SYS_SEGMENT_AVAIL_386_TSS)
|
|
{
|
|
BX_ERROR(("allow_io(): TR doesn't point to a valid 32bit TSS"));
|
|
return(0);
|
|
}
|
|
|
|
if (BX_CPU_THIS_PTR tr.cache.u.system.limit_scaled < 103) {
|
|
BX_ERROR(("allow_io(): TR.limit < 103"));
|
|
return(0);
|
|
}
|
|
|
|
access_read_linear(BX_CPU_THIS_PTR tr.cache.u.system.base + 102,
|
|
2, 0, BX_READ, &io_base);
|
|
|
|
if (io_base <= 103) {
|
|
BX_ERROR(("allow_io(): TR:io_base (%u) <= 103", io_base));
|
|
return(0);
|
|
}
|
|
|
|
if ((Bit32s) (addr/8) >= (Bit32s) (BX_CPU_THIS_PTR tr.cache.u.system.limit_scaled - io_base)) {
|
|
BX_ERROR(("allow_io(): IO addr %x (len %d) outside TSS IO permission map (base=%x, limit=%x) #GP(0)",
|
|
addr, len, io_base, BX_CPU_THIS_PTR tr.cache.u.system.limit_scaled));
|
|
return(0);
|
|
}
|
|
|
|
access_read_linear(BX_CPU_THIS_PTR tr.cache.u.system.base + io_base + addr/8,
|
|
2, 0, BX_READ, &permission16);
|
|
|
|
unsigned bit_index = addr & 0x07;
|
|
permission16 >>= bit_index;
|
|
for (unsigned i=0; i<len; i++) {
|
|
if (permission16 & 0x01)
|
|
return(0);
|
|
permission16 >>= 1;
|
|
}
|
|
}
|
|
|
|
return(1);
|
|
}
|