/////////////////////////////////////////////////////////////////////////
// $Id: segment_ctrl.cc,v 1.14 2006/03/06 22:03:02 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


void BX_CPU_C::LES_GvMp(bxInstruction_c *i)
{
  if (i->modC0()) {
    BX_DEBUG(("invalid use of LES, must use memory reference!"));
    UndefinedOpcode(i);
  }

#if BX_CPU_LEVEL > 2
  if (i->os32L()) {
    Bit16u es;
    Bit32u reg_32;

    read_virtual_dword(i->seg(), RMAddr(i), &reg_32);
    read_virtual_word(i->seg(), RMAddr(i) + 4, &es);

    load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES], es);

    BX_WRITE_32BIT_REGZ(i->nnn(), reg_32);
  }
  else
#endif /* BX_CPU_LEVEL > 2 */
  { /* 16 bit mode */
    Bit16u reg_16, es;

    read_virtual_word(i->seg(), RMAddr(i), &reg_16);
    read_virtual_word(i->seg(), RMAddr(i) + 2, &es);

    load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES], es);

    BX_WRITE_16BIT_REG(i->nnn(), reg_16);
  }
}

void BX_CPU_C::LDS_GvMp(bxInstruction_c *i)
{
  if (i->modC0()) {
    BX_DEBUG(("invalid use of LDS, must use memory reference!"));
    UndefinedOpcode(i);
  }

#if BX_CPU_LEVEL > 2
  if (i->os32L()) {
    Bit16u ds;
    Bit32u reg_32;

    read_virtual_dword(i->seg(), RMAddr(i), &reg_32);
    read_virtual_word(i->seg(), RMAddr(i) + 4, &ds);

    load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS], ds);

    BX_WRITE_32BIT_REGZ(i->nnn(), reg_32);
  }
  else
#endif /* BX_CPU_LEVEL > 2 */
    { /* 16 bit mode */
    Bit16u reg_16, ds;

    read_virtual_word(i->seg(), RMAddr(i), &reg_16);
    read_virtual_word(i->seg(), RMAddr(i) + 2, &ds);

    load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS], ds);

    BX_WRITE_16BIT_REG(i->nnn(), reg_16);
  }
}

#if BX_CPU_LEVEL >= 3

void BX_CPU_C::LFS_GvMp(bxInstruction_c *i)
{
  if (i->modC0()) {
    BX_DEBUG(("invalid use of LFS, must use memory reference!"));
    UndefinedOpcode(i);
  }

  if (i->os32L()) {
    Bit32u reg_32;
    Bit16u fs;

    read_virtual_dword(i->seg(), RMAddr(i), &reg_32);
    read_virtual_word(i->seg(), RMAddr(i) + 4, &fs);

    load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS], fs);

    BX_WRITE_32BIT_REGZ(i->nnn(), reg_32);
  }
  else { /* 16 bit operand size */
    Bit16u reg_16;
    Bit16u fs;

    read_virtual_word(i->seg(), RMAddr(i), &reg_16);
    read_virtual_word(i->seg(), RMAddr(i) + 2, &fs);

    load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS], fs);

    BX_WRITE_16BIT_REG(i->nnn(), reg_16);
  }
}

void BX_CPU_C::LGS_GvMp(bxInstruction_c *i)
{
  if (i->modC0()) {
    BX_DEBUG(("invalid use of LGS, must use memory reference!"));
    UndefinedOpcode(i);
  }

  if (i->os32L()) {
    Bit32u reg_32;
    Bit16u gs;

    read_virtual_dword(i->seg(), RMAddr(i), &reg_32);
    read_virtual_word(i->seg(), RMAddr(i) + 4, &gs);

    load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS], gs);

    BX_WRITE_32BIT_REGZ(i->nnn(), reg_32);
  }
  else { /* 16 bit operand size */
    Bit16u reg_16;
    Bit16u gs;

    read_virtual_word(i->seg(), RMAddr(i), &reg_16);
    read_virtual_word(i->seg(), RMAddr(i) + 2, &gs);

    load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS], gs);

    BX_WRITE_16BIT_REG(i->nnn(), reg_16);
  }
}

void BX_CPU_C::LSS_GvMp(bxInstruction_c *i)
{
  if (i->modC0()) {
    BX_DEBUG(("invalid use of LSS, must use memory reference!"));
    UndefinedOpcode(i);
  }

  if (i->os32L()) {
    Bit32u reg_32;
    Bit16u ss_raw;

    read_virtual_dword(i->seg(), RMAddr(i), &reg_32);
    read_virtual_word(i->seg(), RMAddr(i) + 4, &ss_raw);

    load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS], ss_raw);

    BX_WRITE_32BIT_REGZ(i->nnn(), reg_32);
  }
  else { /* 16 bit operand size */
    Bit16u reg_16;
    Bit16u ss_raw;

    read_virtual_word(i->seg(), RMAddr(i), &reg_16);
    read_virtual_word(i->seg(), RMAddr(i) + 2, &ss_raw);

    load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS], ss_raw);

    BX_WRITE_16BIT_REG(i->nnn(), reg_16);
  }
}

#endif
