/* * Copyright (c) 2003-2006, 2008 The Regents of The University of Michigan * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer; * redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution; * neither the name of the copyright holders nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * Authors: Gabe Black */ /* * Copyright (c) 2007-2008 The Hewlett-Packard Development Company * All rights reserved. * * Redistribution and use of this software in source and binary forms, * with or without modification, are permitted provided that the * following conditions are met: * * The software must be used only for Non-Commercial Use which means any * use which is NOT directed to receiving any direct monetary * compensation for, or commercial advantage from such use. Illustrative * examples of non-commercial use are academic research, personal study, * teaching, education and corporate research & development. * Illustrative examples of commercial use are distributing products for * commercial advantage and providing services using the software for * commercial advantage. * * If you wish to use this software or functionality therein that may be * covered by patents for commercial use, please contact: * Director of Intellectual Property Licensing * Office of Strategy and Technology * Hewlett-Packard Company * 1501 Page Mill Road * Palo Alto, California 94304 * * Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. Redistributions * in binary form must reproduce the above copyright notice, this list of * conditions and the following disclaimer in the documentation and/or * other materials provided with the distribution. Neither the name of * the COPYRIGHT HOLDER(s), HEWLETT-PACKARD COMPANY, nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. No right of * sublicense is granted herewith. Derivatives of the software and * output created using the software may be prepared, but only for * Non-Commercial Uses. Derivatives of the software may be shared with * others provided: (i) the others agree to abide by the list of * conditions herein which includes the Non-Commercial Use restrictions; * and (ii) such Derivatives of the software include the above copyright * notice to acknowledge the contribution from this software where * applicable, this list of conditions and the disclaimer below. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * Authors: Gabe Black */ #include "arch/x86/miscregfile.hh" #include "arch/x86/tlb.hh" #include "cpu/base.hh" #include "cpu/thread_context.hh" #include "sim/serialize.hh" using namespace X86ISA; using namespace std; class Checkpoint; //These functions map register indices to names string X86ISA::getMiscRegName(RegIndex index) { panic("No misc registers in x86 yet!\n"); } void MiscRegFile::clear() { // Blank everything. 0 might not be an appropriate value for some things. memset(regVal, 0, NumMiscRegs * sizeof(MiscReg)); } MiscReg MiscRegFile::readRegNoEffect(MiscRegIndex miscReg) { // Make sure we're not dealing with an illegal control register. // Instructions should filter out these indexes, and nothing else should // attempt to read them directly. assert( miscReg != MISCREG_CR1 && !(miscReg > MISCREG_CR4 && miscReg < MISCREG_CR8) && !(miscReg > MISCREG_CR8 && miscReg <= MISCREG_CR15)); if (isApicReg(miscReg)) { panic("Can't readRegNoEffect from the local APIC.\n"); } return regVal[miscReg]; } MiscReg MiscRegFile::readReg(MiscRegIndex miscReg, ThreadContext * tc) { #if FULL_SYSTEM if (isApicReg(miscReg)) { Interrupts * interrupts = dynamic_cast( tc->getCpuPtr()->getInterruptController()); assert(interrupts); return interrupts->readReg( (ApicRegIndex)(miscReg - MISCREG_APIC_START), tc); } #endif if (miscReg == MISCREG_TSC) { return regVal[MISCREG_TSC] + tc->getCpuPtr()->curCycle(); } return readRegNoEffect(miscReg); } void MiscRegFile::setRegNoEffect(MiscRegIndex miscReg, const MiscReg &val) { // Make sure we're not dealing with an illegal control register. // Instructions should filter out these indexes, and nothing else should // attempt to write to them directly. assert( miscReg != MISCREG_CR1 && !(miscReg > MISCREG_CR4 && miscReg < MISCREG_CR8) && !(miscReg > MISCREG_CR8 && miscReg <= MISCREG_CR15)); if (isApicReg(miscReg)) { panic("Can't setRegNoEffect from the local APIC.\n"); } regVal[miscReg] = val; } void MiscRegFile::setReg(MiscRegIndex miscReg, const MiscReg &val, ThreadContext * tc) { MiscReg newVal = val; #if FULL_SYSTEM if (isApicReg(miscReg)) { Interrupts * interrupts = dynamic_cast( tc->getCpuPtr()->getInterruptController()); assert(interrupts); interrupts->setReg( ApicRegIndex(miscReg - MISCREG_APIC_START), val, tc); return; } #endif switch(miscReg) { case MISCREG_CR0: { CR0 toggled = regVal[miscReg] ^ val; CR0 newCR0 = val; Efer efer = regVal[MISCREG_EFER]; HandyM5Reg m5reg = regVal[MISCREG_M5_REG]; if (toggled.pg && efer.lme) { if (newCR0.pg) { //Turning on long mode efer.lma = 1; m5reg.mode = LongMode; regVal[MISCREG_EFER] = efer; } else { //Turning off long mode efer.lma = 0; m5reg.mode = LegacyMode; regVal[MISCREG_EFER] = efer; } } // Figure out what submode we're in. if (m5reg.mode == LongMode) { SegAttr csAttr = regVal[MISCREG_CS_ATTR]; if (csAttr.longMode) m5reg.submode = SixtyFourBitMode; else m5reg.submode = CompatabilityMode; } else { if (newCR0.pe) { RFLAGS rflags = regVal[MISCREG_RFLAGS]; if (rflags.vm) m5reg.submode = Virtual8086Mode; else m5reg.submode = ProtectedMode; } else { m5reg.submode = RealMode; } } regVal[MISCREG_M5_REG] = m5reg; if (toggled.pg) { tc->getITBPtr()->invalidateAll(); tc->getDTBPtr()->invalidateAll(); } //This must always be 1. newCR0.et = 1; newVal = newCR0; } break; case MISCREG_CR2: break; case MISCREG_CR3: tc->getITBPtr()->invalidateNonGlobal(); tc->getDTBPtr()->invalidateNonGlobal(); break; case MISCREG_CR4: { CR4 toggled = regVal[miscReg] ^ val; if (toggled.pae || toggled.pse || toggled.pge) { tc->getITBPtr()->invalidateAll(); tc->getDTBPtr()->invalidateAll(); } } break; case MISCREG_CR8: break; case MISCREG_CS_ATTR: { SegAttr toggled = regVal[miscReg] ^ val; SegAttr newCSAttr = val; HandyM5Reg m5reg = regVal[MISCREG_M5_REG]; if (toggled.longMode) { if (newCSAttr.longMode) { if (m5reg.mode == LongMode) m5reg.submode = SixtyFourBitMode; regVal[MISCREG_ES_EFF_BASE] = 0; regVal[MISCREG_CS_EFF_BASE] = 0; regVal[MISCREG_SS_EFF_BASE] = 0; regVal[MISCREG_DS_EFF_BASE] = 0; } else { if (m5reg.mode == LongMode) m5reg.submode = CompatabilityMode; regVal[MISCREG_ES_EFF_BASE] = regVal[MISCREG_ES_BASE]; regVal[MISCREG_CS_EFF_BASE] = regVal[MISCREG_CS_BASE]; regVal[MISCREG_SS_EFF_BASE] = regVal[MISCREG_SS_BASE]; regVal[MISCREG_DS_EFF_BASE] = regVal[MISCREG_DS_BASE]; } } m5reg.cpl = newCSAttr.dpl; regVal[MISCREG_M5_REG] = m5reg; } break; // These segments always actually use their bases, or in other words // their effective bases must stay equal to their actual bases. case MISCREG_FS_BASE: case MISCREG_GS_BASE: case MISCREG_HS_BASE: case MISCREG_TSL_BASE: case MISCREG_TSG_BASE: case MISCREG_TR_BASE: case MISCREG_IDTR_BASE: regVal[MISCREG_SEG_EFF_BASE(miscReg - MISCREG_SEG_BASE_BASE)] = val; break; // These segments ignore their bases in 64 bit mode. // their effective bases must stay equal to their actual bases. case MISCREG_ES_BASE: case MISCREG_CS_BASE: case MISCREG_SS_BASE: case MISCREG_DS_BASE: { Efer efer = regVal[MISCREG_EFER]; SegAttr csAttr = regVal[MISCREG_CS_ATTR]; if (!efer.lma || !csAttr.longMode) // Check for non 64 bit mode. regVal[MISCREG_SEG_EFF_BASE(miscReg - MISCREG_SEG_BASE_BASE)] = val; } break; case MISCREG_TSC: regVal[MISCREG_TSC] = val - tc->getCpuPtr()->curCycle(); return; default: break; } setRegNoEffect(miscReg, newVal); } void MiscRegFile::serialize(std::ostream & os) { SERIALIZE_ARRAY(regVal, NumMiscRegs); } void MiscRegFile::unserialize(Checkpoint * cp, const std::string & section) { UNSERIALIZE_ARRAY(regVal, NumMiscRegs); }