///////////////////////////////////////////////////////////////////////// // $Id: flag_ctrl_pro.cc,v 1.16 2004-09-30 16:50:03 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" #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 */