121 lines
3.7 KiB
C++
121 lines
3.7 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id: flag_ctrl_pro.cc,v 1.37 2009-02-13 20:09:56 sshwarts Exp $
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2001 MandrakeSoft S.A.
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//
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// MandrakeSoft S.A.
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// 43, rue d'Aboukir
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// 75002 Paris - France
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// http://www.linux-mandrake.com/
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// http://www.mandrakesoft.com/
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA B 02110-1301 USA
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//
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/////////////////////////////////////////////////////////////////////////
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#define NEED_CPU_REG_SHORTCUTS 1
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#include "bochs.h"
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#include "cpu.h"
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#define LOG_THIS BX_CPU_THIS_PTR
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void BX_CPP_AttrRegparmN(1) BX_CPU_C::setEFlags(Bit32u val)
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{
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// VM flag could not be set from long mode
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#if BX_SUPPORT_X86_64
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if (long_mode()) {
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if (BX_CPU_THIS_PTR get_VM()) BX_PANIC(("VM is set in long mode !"));
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val &= ~EFlagsVMMask;
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}
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#endif
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if (val & (EFlagsTFMask|EFlagsRFMask)) {
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BX_CPU_THIS_PTR async_event = 1; // TF == 1 || RF == 1
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}
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if (val & EFlagsIFMask) {
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if (! BX_CPU_THIS_PTR get_IF())
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BX_CPU_THIS_PTR async_event = 1; // IF bit was set
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}
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BX_CPU_THIS_PTR eflags = val;
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BX_CPU_THIS_PTR lf_flags_status = 0; // OSZAPC flags are known.
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#if BX_CPU_LEVEL >= 4 && BX_SUPPORT_ALIGNMENT_CHECK
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handleAlignmentCheck();
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#endif
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handleCpuModeChange(); // VM flag might be changed
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}
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void BX_CPP_AttrRegparmN(2)
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BX_CPU_C::writeEFlags(Bit32u flags, Bit32u changeMask)
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{
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// Build a mask of the non-reserved bits:
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// ID,VIP,VIF,AC,VM,RF,x,NT,IOPL,OF,DF,IF,TF,SF,ZF,x,AF,x,PF,x,CF
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Bit32u supportMask = 0x00037fd5;
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#if BX_CPU_LEVEL >= 4
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supportMask |= (EFlagsIDMask | EFlagsACMask); // ID/AC
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#endif
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#if BX_SUPPORT_VME
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supportMask |= (EFlagsVIPMask | EFlagsVIFMask); // VIP/VIF
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#endif
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// Screen out changing of any unsupported bits.
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changeMask &= supportMask;
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Bit32u newEFlags = (BX_CPU_THIS_PTR eflags & ~changeMask) |
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(flags & changeMask);
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setEFlags(newEFlags);
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// OSZAPC flags are known - done in setEFlags(newEFlags)
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}
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void BX_CPP_AttrRegparmN(3)
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BX_CPU_C::write_flags(Bit16u flags, bx_bool change_IOPL, bx_bool change_IF)
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{
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// Build a mask of the following bits:
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// x,NT,IOPL,OF,DF,IF,TF,SF,ZF,x,AF,x,PF,x,CF
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Bit32u changeMask = 0x0dd5;
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#if BX_CPU_LEVEL >= 3
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changeMask |= EFlagsNTMask; // NT is modified as requested.
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if (change_IOPL)
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changeMask |= EFlagsIOPLMask; // IOPL is modified as requested.
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#endif
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if (change_IF)
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changeMask |= EFlagsIFMask;
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writeEFlags(Bit32u(flags), changeMask);
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}
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// Cause arithmetic flags to be in known state and cached in val32.
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Bit32u BX_CPU_C::force_flags(void)
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{
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if (BX_CPU_THIS_PTR lf_flags_status) {
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Bit32u newflags;
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newflags = get_CF() ? EFlagsCFMask : 0;
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newflags |= get_PF() ? EFlagsPFMask : 0;
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newflags |= get_AF() ? EFlagsAFMask : 0;
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newflags |= get_ZF() ? EFlagsZFMask : 0;
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newflags |= get_SF() ? EFlagsSFMask : 0;
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newflags |= get_OF() ? EFlagsOFMask : 0;
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setEFlagsOSZAPC(newflags);
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}
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return BX_CPU_THIS_PTR eflags;
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}
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