50efc3b8c7
- it works only on x86 with gcc2.95+
- uses the GCC function atribute "regparm(n)" to declare that certain
functions use the register calling convention
- performance improvement is about 6%
163 lines
4.2 KiB
C++
163 lines
4.2 KiB
C++
/////////////////////////////////////////////////////////////////////////
|
|
// $Id: flag_ctrl_pro.cc,v 1.14 2003-03-02 23:59:09 cbothamy 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
|
|
|
|
|
|
|
|
|
|
void BX_CPP_AttrRegparmN(2)
|
|
BX_CPU_C::writeEFlags(Bit32u flags, Bit32u changeMask)
|
|
{
|
|
Bit32u supportMask, newEFlags;
|
|
|
|
// Build a mask of the non-reserved bits:
|
|
// x,x,x,x,VM,RF,x,NT,IOPL,OF,DF,IF,TF,SF,ZF,x,AF,x,PF,x,CF
|
|
supportMask = 0x00037fd5;
|
|
#if BX_CPU_LEVEL >= 4
|
|
supportMask |= ((1<<21) | (1<<18)); // ID/AC
|
|
#endif
|
|
|
|
// Screen out changing of any unsupported bits.
|
|
changeMask &= supportMask;
|
|
|
|
newEFlags = (BX_CPU_THIS_PTR eflags.val32 & ~changeMask) |
|
|
(flags & changeMask);
|
|
BX_CPU_THIS_PTR setEFlags( newEFlags );
|
|
BX_CPU_THIS_PTR lf_flags_status = 0; // OSZAPC flags are known.
|
|
|
|
if (newEFlags & (1 << 8)) {
|
|
BX_CPU_THIS_PTR async_event = 1; // TF = 1
|
|
}
|
|
}
|
|
|
|
|
|
void BX_CPP_AttrRegparmN(3)
|
|
BX_CPU_C::write_flags(Bit16u flags, bx_bool change_IOPL, bx_bool change_IF)
|
|
{
|
|
Bit32u changeMask = 0x0dd5;
|
|
|
|
#if BX_CPU_LEVEL >= 3
|
|
changeMask |= (1<<14); // NT is modified as requested.
|
|
if (change_IOPL)
|
|
changeMask |= (3<<12); // IOPL is modified as requested.
|
|
#endif
|
|
if (change_IF)
|
|
changeMask |= (1<<9);
|
|
|
|
writeEFlags(Bit32u(flags), changeMask);
|
|
}
|
|
|
|
|
|
#if BX_CPU_LEVEL >= 3
|
|
void
|
|
BX_CPU_C::write_eflags(Bit32u eflags_raw, bx_bool change_IOPL, bx_bool change_IF,
|
|
bx_bool change_VM, bx_bool change_RF)
|
|
{
|
|
Bit32u changeMask = 0x4dd5;
|
|
|
|
#if BX_CPU_LEVEL >= 4
|
|
changeMask |= ((1<<21) | (1<<18)); // ID/AC
|
|
#endif
|
|
if (change_IOPL)
|
|
changeMask |= (3<<12);
|
|
if (change_IF)
|
|
changeMask |= (1<<9);
|
|
if (change_VM)
|
|
changeMask |= (1<<17);
|
|
if (change_RF)
|
|
changeMask |= (1<<16);
|
|
|
|
writeEFlags(eflags_raw, changeMask);
|
|
}
|
|
#endif /* BX_CPU_LEVEL >= 3 */
|
|
|
|
|
|
Bit16u
|
|
BX_CPU_C::read_flags(void)
|
|
{
|
|
Bit16u flags16;
|
|
|
|
// Cause arithmetic flags to be in known state and cached in val32.
|
|
if (BX_CPU_THIS_PTR lf_flags_status) {
|
|
(void) get_CF();
|
|
(void) get_PF();
|
|
(void) get_AF();
|
|
(void) get_ZF();
|
|
(void) get_SF();
|
|
(void) get_OF();
|
|
}
|
|
flags16 = (Bit16u) BX_CPU_THIS_PTR eflags.val32;
|
|
|
|
/* 8086: bits 12-15 always set to 1.
|
|
* 286: in real mode, bits 12-15 always cleared.
|
|
* 386+: real-mode: bit15 cleared, bits 14..12 are last loaded value
|
|
* protected-mode: bit 15 clear, bit 14 = last loaded, IOPL?
|
|
*/
|
|
#if BX_CPU_LEVEL < 2
|
|
flags16 |= 0xF000; /* 8086 nature */
|
|
#elif BX_CPU_LEVEL == 2
|
|
if (real_mode()) {
|
|
flags16 &= 0x0FFF; /* 80286 in real mode nature */
|
|
}
|
|
#else /* 386+ */
|
|
#endif
|
|
|
|
return(flags16);
|
|
}
|
|
|
|
|
|
#if BX_CPU_LEVEL >= 3
|
|
Bit32u
|
|
BX_CPU_C::read_eflags(void)
|
|
{
|
|
Bit32u flags32;
|
|
|
|
// Cause arithmetic flags to be in known state and cached in val32.
|
|
if (BX_CPU_THIS_PTR lf_flags_status) {
|
|
(void) get_CF();
|
|
(void) get_PF();
|
|
(void) get_AF();
|
|
(void) get_ZF();
|
|
(void) get_SF();
|
|
(void) get_OF();
|
|
}
|
|
flags32 = BX_CPU_THIS_PTR eflags.val32;
|
|
|
|
#if 0
|
|
/*
|
|
* 386+: real-mode: bit15 cleared, bits 14..12 are last loaded value
|
|
* protected-mode: bit 15 clear, bit 14 = last loaded, IOPL?
|
|
*/
|
|
#endif
|
|
|
|
return(flags32);
|
|
}
|
|
#endif /* BX_CPU_LEVEL >= 3 */
|