mirror of https://github.com/bochs-emu/Bochs
208 lines
5.9 KiB
C++
208 lines
5.9 KiB
C++
// 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#include "bochs.h"
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void
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BX_CPU_C::write_flags(Bit16u flags, Boolean change_IOPL, Boolean change_IF)
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{
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BX_CPU_THIS_PTR set_CF(flags & 0x01);
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BX_CPU_THIS_PTR set_PF((flags >> 2) & 0x01);
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BX_CPU_THIS_PTR set_AF((flags >> 4) & 0x01);
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BX_CPU_THIS_PTR set_ZF((flags >> 6) & 0x01);
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BX_CPU_THIS_PTR set_SF((flags >> 7) & 0x01);
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#if 0
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// +++
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if (BX_CPU_THIS_PTR eflags.tf==0 && (flags&0x0100))
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fprintf(stderr, "TF 0->1\n");
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else if (BX_CPU_THIS_PTR eflags.tf && !(flags&0x0100))
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fprintf(stderr, "TF 1->0\n");
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else if (BX_CPU_THIS_PTR eflags.tf && (flags&0x0100))
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fprintf(stderr, "TF 1->1\n");
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#endif
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BX_CPU_THIS_PTR eflags.tf = (flags >> 8) & 0x01;
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if (BX_CPU_THIS_PTR eflags.tf) {
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BX_CPU_THIS_PTR async_event = 1;
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}
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if (change_IF)
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BX_CPU_THIS_PTR eflags.if_ = (flags >> 9) & 0x01;
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BX_CPU_THIS_PTR eflags.df = (flags >> 10) & 0x01;
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BX_CPU_THIS_PTR set_OF((flags >> 11) & 0x01);
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#if BX_CPU_LEVEL == 2
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BX_CPU_THIS_PTR eflags.iopl = 0;
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BX_CPU_THIS_PTR eflags.nt = 0;
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#else
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if (change_IOPL)
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BX_CPU_THIS_PTR eflags.iopl = (flags >> 12) & 0x03;
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BX_CPU_THIS_PTR eflags.nt = (flags >> 14) & 0x01;
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#endif
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}
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#if BX_CPU_LEVEL >= 3
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void
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BX_CPU_C::write_eflags(Bit32u eflags_raw, Boolean change_IOPL, Boolean change_IF,
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Boolean change_VM, Boolean change_RF)
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{
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BX_CPU_THIS_PTR set_CF(eflags_raw & 0x01);
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BX_CPU_THIS_PTR set_PF((eflags_raw >> 2) & 0x01);
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BX_CPU_THIS_PTR set_AF((eflags_raw >> 4) & 0x01);
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BX_CPU_THIS_PTR set_ZF((eflags_raw >> 6) & 0x01);
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BX_CPU_THIS_PTR set_SF((eflags_raw >> 7) & 0x01);
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#if 0
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// +++
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if (BX_CPU_THIS_PTR eflags.tf==0 && (eflags_raw&0x0100))
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fprintf(stderr, "TF 0->1\n");
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else if (BX_CPU_THIS_PTR eflags.tf && !(eflags_raw&0x0100))
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fprintf(stderr, "TF 1->0\n");
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else if (BX_CPU_THIS_PTR eflags.tf && (eflags_raw&0x0100))
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fprintf(stderr, "TF 1->1\n");
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#endif
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BX_CPU_THIS_PTR eflags.tf = (eflags_raw >> 8) & 0x01;
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if (BX_CPU_THIS_PTR eflags.tf) {
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BX_CPU_THIS_PTR async_event = 1;
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}
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if (change_IF)
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BX_CPU_THIS_PTR eflags.if_ = (eflags_raw >> 9) & 0x01;
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BX_CPU_THIS_PTR eflags.df = (eflags_raw >> 10) & 0x01;
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BX_CPU_THIS_PTR set_OF((eflags_raw >> 11) & 0x01);
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if (change_IOPL)
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BX_CPU_THIS_PTR eflags.iopl = (eflags_raw >> 12) & 0x03;
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BX_CPU_THIS_PTR eflags.nt = (eflags_raw >> 14) & 0x01;
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if (change_VM) {
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BX_CPU_THIS_PTR eflags.vm = (eflags_raw >> 17) & 0x01;
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#if BX_SUPPORT_V8086_MODE == 0
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if (BX_CPU_THIS_PTR eflags.vm)
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bx_panic("write_eflags: VM bit set: BX_SUPPORT_V8086_MODE==0\n");
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#endif
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}
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if (change_RF) {
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BX_CPU_THIS_PTR eflags.rf = (eflags_raw >> 16) & 0x01;
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}
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#if BX_CPU_LEVEL >= 4
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BX_CPU_THIS_PTR eflags.ac = (eflags_raw >> 18) & 0x01;
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BX_CPU_THIS_PTR eflags.id = (eflags_raw >> 21) & 0x01;
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#endif
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}
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#endif /* BX_CPU_LEVEL >= 3 */
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Bit16u
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BX_CPU_C::read_flags(void)
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{
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Bit16u flags;
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flags = (get_CF()) |
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(BX_CPU_THIS_PTR eflags.bit1 << 1) |
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((get_PF()) << 2) |
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(BX_CPU_THIS_PTR eflags.bit3 << 3) |
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((get_AF()>0) << 4) |
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(BX_CPU_THIS_PTR eflags.bit5 << 5) |
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((get_ZF()>0) << 6) |
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((get_SF()>0) << 7) |
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(BX_CPU_THIS_PTR eflags.tf << 8) |
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(BX_CPU_THIS_PTR eflags.if_ << 9) |
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(BX_CPU_THIS_PTR eflags.df << 10) |
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((get_OF()>0) << 11) |
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(BX_CPU_THIS_PTR eflags.iopl << 12) |
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(BX_CPU_THIS_PTR eflags.nt << 14) |
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(BX_CPU_THIS_PTR eflags.bit15 << 15);
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/* 8086: bits 12-15 always set to 1.
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* 286: in real mode, bits 12-15 always cleared.
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* 386+: real-mode: bit15 cleared, bits 14..12 are last loaded value
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* protected-mode: bit 15 clear, bit 14 = last loaded, IOPL?
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*/
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#if BX_CPU_LEVEL < 2
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flags |= 0xF000; /* 8086 nature */
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#elif BX_CPU_LEVEL == 2
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if (real_mode()) {
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flags &= 0x0FFF; /* 80286 in real mode nature */
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}
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#else /* 386+ */
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#endif
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return(flags);
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}
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#if BX_CPU_LEVEL >= 3
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Bit32u
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BX_CPU_C::read_eflags(void)
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{
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Bit32u eflags_raw;
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eflags_raw =
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(get_CF()) |
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(BX_CPU_THIS_PTR eflags.bit1 << 1) |
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((get_PF()) << 2) |
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(BX_CPU_THIS_PTR eflags.bit3 << 3) |
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((get_AF()>0) << 4) |
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(BX_CPU_THIS_PTR eflags.bit5 << 5) |
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((get_ZF()>0) << 6) |
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((get_SF()>0) << 7) |
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(BX_CPU_THIS_PTR eflags.tf << 8) |
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(BX_CPU_THIS_PTR eflags.if_ << 9) |
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(BX_CPU_THIS_PTR eflags.df << 10) |
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((get_OF()>0) << 11) |
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(BX_CPU_THIS_PTR eflags.iopl << 12) |
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(BX_CPU_THIS_PTR eflags.nt << 14) |
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(BX_CPU_THIS_PTR eflags.bit15 << 15) |
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(BX_CPU_THIS_PTR eflags.rf << 16) |
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(BX_CPU_THIS_PTR eflags.vm << 17)
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#if BX_CPU_LEVEL >= 4
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| (BX_CPU_THIS_PTR eflags.ac << 18)
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| (BX_CPU_THIS_PTR eflags.id << 21)
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#endif
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;
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#if 0
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/*
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* 386+: real-mode: bit15 cleared, bits 14..12 are last loaded value
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* protected-mode: bit 15 clear, bit 14 = last loaded, IOPL?
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*/
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#endif
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return(eflags_raw);
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}
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#endif /* BX_CPU_LEVEL >= 3 */
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