pagetable.hh revision 5237:6c819dbe8045 
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 "sim/host.hh"
65#include "base/bitunion.hh"
66#include "base/misc.hh"
67
68class Checkpoint;
69
70namespace 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        Addr pageStart()
117        {
118            return paddr;
119        }
120
121        void serialize(std::ostream &os);
122        void unserialize(Checkpoint *cp, const std::string &section);
123    };
124}
125
126#endif
127