src/arch/x86/pagetable.hh

   1 /*
   2  * Copyright (c) 2007 The Hewlett-Packard Development Company
   3  * All rights reserved.
   4  *
   5  * Redistribution and use of this software in source and binary forms,
   6  * with or without modification, are permitted provided that the
   7  * following conditions are met:
   8  *
   9  * The software must be used only for Non-Commercial Use which means any
  10  * use which is NOT directed to receiving any direct monetary
  11  * compensation for, or commercial advantage from such use.  Illustrative
  12  * examples of non-commercial use are academic research, personal study,
  13  * teaching, education and corporate research & development.
  14  * Illustrative examples of commercial use are distributing products for
  15  * commercial advantage and providing services using the software for
  16  * commercial advantage.
  17  *
  18  * If you wish to use this software or functionality therein that may be
  19  * covered by patents for commercial use, please contact:
  20  *     Director of Intellectual Property Licensing
  21  *     Office of Strategy and Technology
  22  *     Hewlett-Packard Company
  23  *     1501 Page Mill Road
  24  *     Palo Alto, California  94304
  25  *
  26  * Redistributions of source code must retain the above copyright notice,
  27  * this list of conditions and the following disclaimer.  Redistributions
  28  * in binary form must reproduce the above copyright notice, this list of
  29  * conditions and the following disclaimer in the documentation and/or
  30  * other materials provided with the distribution.  Neither the name of
  31  * the COPYRIGHT HOLDER(s), HEWLETT-PACKARD COMPANY, nor the names of its
  32  * contributors may be used to endorse or promote products derived from
  33  * this software without specific prior written permission.  No right of
  34  * sublicense is granted herewith.  Derivatives of the software and
  35  * output created using the software may be prepared, but only for
  36  * Non-Commercial Uses.  Derivatives of the software may be shared with
  37  * others provided: (i) the others agree to abide by the list of
  38  * conditions herein which includes the Non-Commercial Use restrictions;
  39  * and (ii) such Derivatives of the software include the above copyright
  40  * notice to acknowledge the contribution from this software where
  41  * applicable, this list of conditions and the disclaimer below.
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  44  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  45  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  46  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  47  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  48  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  49  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  50  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  51  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  52  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  53  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  54  *
  55  * Authors: Gabe Black
  56  */
  57
  58 #ifndef __ARCH_X86_PAGETABLE_HH__
  59 #define __ARCH_X86_PAGETABLE_HH__
  60
  61 #include <iostream>
  62 #include <string>
  63
  64 #include "base/bitunion.hh"
  65 #include "base/misc.hh"
  66 #include "base/types.hh"
  67
  68 class Checkpoint;
  69
  70 namespace X86ISA
  71 {
  72     BitUnion64(VAddr)
  73         Bitfield<20, 12> longl1;
  74         Bitfield<29, 21> longl2;
  75         Bitfield<38, 30> longl3;
  76         Bitfield<47, 39> longl4;
  77
  78         Bitfield<20, 12> pael1;
  79         Bitfield<29, 21> pael2;
  80         Bitfield<31, 30> pael3;
  81
  82         Bitfield<21, 12> norml1;
  83         Bitfield<31, 22> norml2;
  84     EndBitUnion(VAddr)
  85
  86     struct TlbEntry
  87     {
  88         // The base of the physical page.
  89         Addr paddr;
  90
  91         // The beginning of the virtual page this entry maps.
  92         Addr vaddr;
  93         // The size of the page this entry represents.
  94         Addr size;
  95
  96         // Read permission is always available, assuming it isn't blocked by
  97         // other mechanisms.
  98         bool writable;
  99         // Whether this page is accesible without being in supervisor mode.
 100         bool user;
 101         // Whether to use write through or write back. M5 ignores this and
 102         // lets the caches handle the writeback policy.
 103         //bool pwt;
 104         // Whether the page is cacheable or not.
 105         bool uncacheable;
 106         // Whether or not to kick this page out on a write to CR3.
 107         bool global;
 108         // A bit used to form an index into the PAT table.
 109         bool patBit;
 110         // Whether or not memory on this page can be executed.
 111         bool noExec;
 112
 113         TlbEntry(Addr asn, Addr _vaddr, Addr _paddr);
 114         TlbEntry() {}
 115
 116         void
 117         updateVaddr(Addr new_vaddr)
 118         {
 119             vaddr = new_vaddr;
 120         }
 121
 122         Addr pageStart()
 123         {
 124             return paddr;
 125         }
 126
 127         void serialize(std::ostream &os);
 128         void unserialize(Checkpoint *cp, const std::string &section);
 129     };
 130 }
 131
 132 #endif