page_table.hh revision 8763:509e9bb84dfa
1/* 2 * Copyright (c) 2003 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: Steve Reinhardt 29 */ 30 31/** 32 * @file 33 * Declaration of a non-full system Page Table. 34 */ 35 36#ifndef __MEM_PAGE_TABLE_HH__ 37#define __MEM_PAGE_TABLE_HH__ 38 39#include <string> 40 41#include "arch/isa_traits.hh" 42#include "arch/tlb.hh" 43#include "base/hashmap.hh" 44#include "base/types.hh" 45#include "config/full_system.hh" 46#include "config/the_isa.hh" 47#include "mem/request.hh" 48#include "sim/serialize.hh" 49 50#if !FULL_SYSTEM 51class Process; 52#endif 53 54/** 55 * Page Table Declaration. 56 */ 57class PageTable 58{ 59 protected: 60 typedef m5::hash_map<Addr, TheISA::TlbEntry> PTable; 61 typedef PTable::iterator PTableItr; 62 PTable pTable; 63 64 struct cacheElement { 65 Addr vaddr; 66 TheISA::TlbEntry entry; 67 }; 68 69 struct cacheElement pTableCache[3]; 70 71 const Addr pageSize; 72 const Addr offsetMask; 73 74#if !FULL_SYSTEM 75 Process *process; 76#endif 77 78 public: 79 80 PageTable( 81#if !FULL_SYSTEM 82 Process *_process, 83#endif 84 Addr _pageSize = TheISA::VMPageSize); 85 86 ~PageTable(); 87 88 Addr pageAlign(Addr a) { return (a & ~offsetMask); } 89 Addr pageOffset(Addr a) { return (a & offsetMask); } 90 91 void allocate(Addr vaddr, int64_t size); 92 void remap(Addr vaddr, int64_t size, Addr new_vaddr); 93 void deallocate(Addr vaddr, int64_t size); 94 95 /** 96 * Lookup function 97 * @param vaddr The virtual address. 98 * @return entry The page table entry corresponding to vaddr. 99 */ 100 bool lookup(Addr vaddr, TheISA::TlbEntry &entry); 101 102 /** 103 * Translate function 104 * @param vaddr The virtual address. 105 * @param paddr Physical address from translation. 106 * @return True if translation exists 107 */ 108 bool translate(Addr vaddr, Addr &paddr); 109 110 /** 111 * Simplified translate function (just check for translation) 112 * @param vaddr The virtual address. 113 * @return True if translation exists 114 */ 115 bool translate(Addr vaddr) { Addr dummy; return translate(vaddr, dummy); } 116 117 /** 118 * Perform a translation on the memory request, fills in paddr 119 * field of req. 120 * @param req The memory request. 121 */ 122 Fault translate(RequestPtr req); 123 124 /** 125 * Update the page table cache. 126 * @param vaddr virtual address (page aligned) to check 127 * @param pte page table entry to return 128 */ 129 inline void updateCache(Addr vaddr, TheISA::TlbEntry entry) 130 { 131 pTableCache[2].entry = pTableCache[1].entry; 132 pTableCache[2].vaddr = pTableCache[1].vaddr; 133 pTableCache[1].entry = pTableCache[0].entry; 134 pTableCache[1].vaddr = pTableCache[0].vaddr; 135 pTableCache[0].entry = entry; 136 pTableCache[0].vaddr = vaddr; 137 } 138 139 140 void serialize(std::ostream &os); 141 142 void unserialize(Checkpoint *cp, const std::string §ion); 143}; 144 145#endif // __MEM_PAGE_TABLE_HH__ 146