src/arch/x86/miscregfile.cc

   1 /*
   2  * Copyright (c) 2003-2006 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * Authors: Gabe Black
  29  */
  30
  31 /*
  32  * Copyright (c) 2007 The Hewlett-Packard Development Company
  33  * All rights reserved.
  34  *
  35  * Redistribution and use of this software in source and binary forms,
  36  * with or without modification, are permitted provided that the
  37  * following conditions are met:
  38  *
  39  * The software must be used only for Non-Commercial Use which means any
  40  * use which is NOT directed to receiving any direct monetary
  41  * compensation for, or commercial advantage from such use.  Illustrative
  42  * examples of non-commercial use are academic research, personal study,
  43  * teaching, education and corporate research & development.
  44  * Illustrative examples of commercial use are distributing products for
  45  * commercial advantage and providing services using the software for
  46  * commercial advantage.
  47  *
  48  * If you wish to use this software or functionality therein that may be
  49  * covered by patents for commercial use, please contact:
  50  *     Director of Intellectual Property Licensing
  51  *     Office of Strategy and Technology
  52  *     Hewlett-Packard Company
  53  *     1501 Page Mill Road
  54  *     Palo Alto, California  94304
  55  *
  56  * Redistributions of source code must retain the above copyright notice,
  57  * this list of conditions and the following disclaimer.  Redistributions
  58  * in binary form must reproduce the above copyright notice, this list of
  59  * conditions and the following disclaimer in the documentation and/or
  60  * other materials provided with the distribution.  Neither the name of
  61  * the COPYRIGHT HOLDER(s), HEWLETT-PACKARD COMPANY, nor the names of its
  62  * contributors may be used to endorse or promote products derived from
  63  * this software without specific prior written permission.  No right of
  64  * sublicense is granted herewith.  Derivatives of the software and
  65  * output created using the software may be prepared, but only for
  66  * Non-Commercial Uses.  Derivatives of the software may be shared with
  67  * others provided: (i) the others agree to abide by the list of
  68  * conditions herein which includes the Non-Commercial Use restrictions;
  69  * and (ii) such Derivatives of the software include the above copyright
  70  * notice to acknowledge the contribution from this software where
  71  * applicable, this list of conditions and the disclaimer below.
  72  *
  73  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  74  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  75  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  76  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  77  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  78  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  79  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  80  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  81  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  82  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  83  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  84  *
  85  * Authors: Gabe Black
  86  */
  87
  88 #include "arch/x86/miscregfile.hh"
  89 #include "arch/x86/tlb.hh"
  90 #include "cpu/thread_context.hh"
  91 #include "sim/serialize.hh"
  92
  93 using namespace X86ISA;
  94 using namespace std;
  95
  96 class Checkpoint;
  97
  98 //These functions map register indices to names
  99 string X86ISA::getMiscRegName(RegIndex index)
 100 {
 101     panic("No misc registers in x86 yet!\n");
 102 }
 103
 104 void MiscRegFile::clear()
 105 {
 106     //When there are actually misc regs implemented, this will clear them
 107 }
 108
 109 MiscReg MiscRegFile::readRegNoEffect(int miscReg)
 110 {
 111     // Make sure we're not dealing with an illegal control register.
 112     // Instructions should filter out these indexes, and nothing else should
 113     // attempt to read them directly.
 114     assert( miscReg != MISCREG_CR1 &&
 115             !(miscReg > MISCREG_CR4 &&
 116               miscReg < MISCREG_CR8) &&
 117             !(miscReg > MISCREG_CR8 &&
 118               miscReg <= MISCREG_CR15));
 119
 120     return regVal[miscReg];
 121 }
 122
 123 MiscReg MiscRegFile::readReg(int miscReg, ThreadContext * tc)
 124 {
 125     return readRegNoEffect(miscReg);
 126 }
 127
 128 void MiscRegFile::setRegNoEffect(int miscReg, const MiscReg &val)
 129 {
 130     // Make sure we're not dealing with an illegal control register.
 131     // Instructions should filter out these indexes, and nothing else should
 132     // attempt to write to them directly.
 133     assert( miscReg != MISCREG_CR1 &&
 134             !(miscReg > MISCREG_CR4 &&
 135               miscReg < MISCREG_CR8) &&
 136             !(miscReg > MISCREG_CR8 &&
 137               miscReg <= MISCREG_CR15));
 138     regVal[miscReg] = val;
 139 }
 140
 141 void MiscRegFile::setReg(int miscReg,
 142         const MiscReg &val, ThreadContext * tc)
 143 {
 144     MiscReg newVal = val;
 145     switch(miscReg)
 146     {
 147       case MISCREG_CR0:
 148         {
 149             CR0 toggled = regVal[miscReg] ^ val;
 150             CR0 newCR0 = val;
 151             Efer efer = regVal[MISCREG_EFER];
 152             if (toggled.pg && efer.lme) {
 153                 if (newCR0.pg) {
 154                     //Turning on long mode
 155                     efer.lma = 1;
 156                     regVal[MISCREG_EFER] = efer;
 157                 } else {
 158                     //Turning off long mode
 159                     efer.lma = 0;
 160                     regVal[MISCREG_EFER] = efer;
 161                 }
 162             }
 163             if (toggled.pg) {
 164                 tc->getITBPtr()->invalidateAll();
 165                 tc->getDTBPtr()->invalidateAll();
 166             }
 167             //This must always be 1.
 168             newCR0.et = 1;
 169             newVal = newCR0;
 170         }
 171         break;
 172       case MISCREG_CR2:
 173         break;
 174       case MISCREG_CR3:
 175         tc->getITBPtr()->invalidateNonGlobal();
 176         tc->getDTBPtr()->invalidateNonGlobal();
 177         break;
 178       case MISCREG_CR4:
 179         {
 180             CR4 toggled = regVal[miscReg] ^ val;
 181             if (toggled.pae || toggled.pse || toggled.pge) {
 182                 tc->getITBPtr()->invalidateAll();
 183                 tc->getDTBPtr()->invalidateAll();
 184             }
 185         }
 186         break;
 187       case MISCREG_CR8:
 188         break;
 189       case MISCREG_CS_ATTR:
 190         {
 191             SegAttr toggled = regVal[miscReg] ^ val;
 192             SegAttr newCSAttr = val;
 193             if (toggled.longMode) {
 194                 SegAttr newCSAttr = val;
 195                 if (newCSAttr.longMode) {
 196                     regVal[MISCREG_ES_EFF_BASE] = 0;
 197                     regVal[MISCREG_CS_EFF_BASE] = 0;
 198                     regVal[MISCREG_SS_EFF_BASE] = 0;
 199                     regVal[MISCREG_DS_EFF_BASE] = 0;
 200                 } else {
 201                     regVal[MISCREG_ES_EFF_BASE] = regVal[MISCREG_ES_BASE];
 202                     regVal[MISCREG_CS_EFF_BASE] = regVal[MISCREG_CS_BASE];
 203                     regVal[MISCREG_SS_EFF_BASE] = regVal[MISCREG_SS_BASE];
 204                     regVal[MISCREG_DS_EFF_BASE] = regVal[MISCREG_DS_BASE];
 205                 }
 206             }
 207         }
 208     }
 209     setRegNoEffect(miscReg, newVal);
 210 }
 211
 212 void MiscRegFile::serialize(std::ostream & os)
 213 {
 214     SERIALIZE_ARRAY(regVal, NumMiscRegs);
 215 }
 216
 217 void MiscRegFile::unserialize(Checkpoint * cp, const std::string & section)
 218 {
 219     UNSERIALIZE_ARRAY(regVal, NumMiscRegs);
 220 }