pagetable.hh revision 9115:6a0ab7d94d4e
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#ifndef __ARCH_X86_PAGETABLE_HH__ 41#define __ARCH_X86_PAGETABLE_HH__ 42 43#include <iostream> 44#include <string> 45 46#include "base/bitunion.hh" 47#include "base/misc.hh" 48#include "base/types.hh" 49#include "base/trie.hh" 50 51class Checkpoint; 52 53namespace X86ISA 54{ 55 struct TlbEntry; 56} 57 58typedef Trie<Addr, X86ISA::TlbEntry> TlbEntryTrie; 59 60namespace X86ISA 61{ 62 BitUnion64(VAddr) 63 Bitfield<20, 12> longl1; 64 Bitfield<29, 21> longl2; 65 Bitfield<38, 30> longl3; 66 Bitfield<47, 39> longl4; 67 68 Bitfield<20, 12> pael1; 69 Bitfield<29, 21> pael2; 70 Bitfield<31, 30> pael3; 71 72 Bitfield<21, 12> norml1; 73 Bitfield<31, 22> norml2; 74 EndBitUnion(VAddr) 75 76 struct TlbEntry 77 { 78 // The base of the physical page. 79 Addr paddr; 80 81 // The beginning of the virtual page this entry maps. 82 Addr vaddr; 83 // The size of the page this represents, in address bits. 84 unsigned logBytes; 85 86 // Read permission is always available, assuming it isn't blocked by 87 // other mechanisms. 88 bool writable; 89 // Whether this page is accesible without being in supervisor mode. 90 bool user; 91 // Whether to use write through or write back. M5 ignores this and 92 // lets the caches handle the writeback policy. 93 //bool pwt; 94 // Whether the page is cacheable or not. 95 bool uncacheable; 96 // Whether or not to kick this page out on a write to CR3. 97 bool global; 98 // A bit used to form an index into the PAT table. 99 bool patBit; 100 // Whether or not memory on this page can be executed. 101 bool noExec; 102 // A sequence number to keep track of LRU. 103 uint64_t lruSeq; 104 105 TlbEntryTrie::Handle trieHandle; 106 107 TlbEntry(Addr asn, Addr _vaddr, Addr _paddr); 108 TlbEntry() {} 109 110 void 111 updateVaddr(Addr new_vaddr) 112 { 113 vaddr = new_vaddr; 114 } 115 116 Addr pageStart() 117 { 118 return paddr; 119 } 120 121 // Return the page size in bytes 122 int size() 123 { 124 return (1 << logBytes); 125 } 126 127 void serialize(std::ostream &os); 128 void unserialize(Checkpoint *cp, const std::string §ion); 129 }; 130} 131 132#endif 133