src/arch/x86/pagetable.cc

   1 /*
   2  * Copyright (c) 2007 The Hewlett-Packard Development Company
   3  * All rights reserved.
   4  *
   5  * The license below extends only to copyright in the software and shall
   6  * not be construed as granting a license to any other intellectual
   7  * property including but not limited to intellectual property relating
   8  * to a hardware implementation of the functionality of the software
   9  * licensed hereunder.  You may use the software subject to the license
  10  * terms below provided that you ensure that this notice is replicated
  11  * unmodified and in its entirety in all distributions of the software,
  12  * modified or unmodified, in source code or in binary form.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions are
  16  * met: redistributions of source code must retain the above copyright
  17  * notice, this list of conditions and the following disclaimer;
  18  * redistributions in binary form must reproduce the above copyright
  19  * notice, this list of conditions and the following disclaimer in the
  20  * documentation and/or other materials provided with the distribution;
  21  * neither the name of the copyright holders nor the names of its
  22  * contributors may be used to endorse or promote products derived from
  23  * this software without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  26  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  27  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  28  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  29  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  30  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  31  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  32  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  35  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  * Authors: Gabe Black
  38  */
  39
  40 #include <cmath>
  41 #include "arch/x86/isa_traits.hh"
  42 #include "arch/x86/pagetable.hh"
  43 #include "sim/serialize.hh"
  44
  45 namespace X86ISA
  46 {
  47
  48 TlbEntry::TlbEntry(Addr asn, Addr _vaddr, Addr _paddr) :
  49     paddr(_paddr), vaddr(_vaddr), logBytes(PageShift), writable(true),
  50     user(true), uncacheable(false), global(false), patBit(0), noExec(false)
  51 {}
  52
  53 void
  54 TlbEntry::serialize(std::ostream &os)
  55 {
  56     SERIALIZE_SCALAR(paddr);
  57     SERIALIZE_SCALAR(vaddr);
  58     SERIALIZE_SCALAR(logBytes);
  59     SERIALIZE_SCALAR(writable);
  60     SERIALIZE_SCALAR(user);
  61     SERIALIZE_SCALAR(uncacheable);
  62     SERIALIZE_SCALAR(global);
  63     SERIALIZE_SCALAR(patBit);
  64     SERIALIZE_SCALAR(noExec);
  65     SERIALIZE_SCALAR(lruSeq);
  66 }
  67
  68 void
  69 TlbEntry::unserialize(Checkpoint *cp, const std::string &section)
  70 {
  71     UNSERIALIZE_SCALAR(paddr);
  72     UNSERIALIZE_SCALAR(vaddr);
  73     //
  74     // The logBytes scalar variable replaced the previous size variable.
  75     // The following code maintains backwards compatibility with previous
  76     // checkpoints using the old size variable.
  77     //
  78     if (UNSERIALIZE_OPT_SCALAR(logBytes) == false) {
  79         int size;
  80         UNSERIALIZE_SCALAR(size);
  81         logBytes = log2(size);
  82     }
  83     UNSERIALIZE_SCALAR(writable);
  84     UNSERIALIZE_SCALAR(user);
  85     UNSERIALIZE_SCALAR(uncacheable);
  86     UNSERIALIZE_SCALAR(global);
  87     UNSERIALIZE_SCALAR(patBit);
  88     UNSERIALIZE_SCALAR(noExec);
  89     if (UNSERIALIZE_OPT_SCALAR(lruSeq) == false) {
  90         lruSeq = 0;
  91     }
  92 }
  93
  94 }