page_table.cc revision 8641
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 * Ron Dreslinski 30 * Ali Saidi 31 */ 32 33/** 34 * @file 35 * Definitions of page table. 36 */ 37#include <fstream> 38#include <map> 39#include <string> 40 41#include "base/bitfield.hh" 42#include "base/intmath.hh" 43#include "base/trace.hh" 44#include "config/the_isa.hh" 45#include "debug/MMU.hh" 46#include "mem/page_table.hh" 47#include "sim/faults.hh" 48#include "sim/sim_object.hh" 49 50using namespace std; 51using namespace TheISA; 52 53PageTable::PageTable(const std::string &__name, uint64_t _pid, Addr _pageSize) 54 : pageSize(_pageSize), offsetMask(mask(floorLog2(_pageSize))), 55 pid(_pid), _name(__name) 56{ 57 assert(isPowerOf2(pageSize)); 58 pTableCache[0].vaddr = 0; 59 pTableCache[1].vaddr = 0; 60 pTableCache[2].vaddr = 0; 61} 62 63PageTable::~PageTable() 64{ 65} 66 67void 68PageTable::map(Addr vaddr, Addr paddr, int64_t size, bool clobber) 69{ 70 // starting address must be page aligned 71 assert(pageOffset(vaddr) == 0); 72 73 DPRINTF(MMU, "Allocating Page: %#x-%#x\n", vaddr, vaddr+ size); 74 75 for (; size > 0; size -= pageSize, vaddr += pageSize, paddr += pageSize) { 76 if (!clobber && (pTable.find(vaddr) != pTable.end())) { 77 // already mapped 78 fatal("PageTable::allocate: address 0x%x already mapped", vaddr); 79 } 80 81 pTable[vaddr] = TheISA::TlbEntry(pid, vaddr, paddr); 82 updateCache(vaddr, pTable[vaddr]); 83 } 84} 85 86void 87PageTable::remap(Addr vaddr, int64_t size, Addr new_vaddr) 88{ 89 assert(pageOffset(vaddr) == 0); 90 assert(pageOffset(new_vaddr) == 0); 91 92 DPRINTF(MMU, "moving pages from vaddr %08p to %08p, size = %d\n", vaddr, 93 new_vaddr, size); 94 95 for (; size > 0; size -= pageSize, vaddr += pageSize, new_vaddr += pageSize) { 96 assert(pTable.find(vaddr) != pTable.end()); 97 98 pTable[new_vaddr] = pTable[vaddr]; 99 pTable.erase(vaddr); 100 pTable[new_vaddr].updateVaddr(new_vaddr); 101 updateCache(new_vaddr, pTable[new_vaddr]); 102 } 103} 104 105void 106PageTable::unmap(Addr vaddr, int64_t size) 107{ 108 assert(pageOffset(vaddr) == 0); 109 110 DPRINTF(MMU, "Unmapping page: %#x-%#x\n", vaddr, vaddr+ size); 111 112 for (; size > 0; size -= pageSize, vaddr += pageSize) { 113 assert(pTable.find(vaddr) != pTable.end()); 114 115 pTable.erase(vaddr); 116 } 117 118} 119 120bool 121PageTable::isUnmapped(Addr vaddr, int64_t size) 122{ 123 // starting address must be page aligned 124 assert(pageOffset(vaddr) == 0); 125 126 for (; size > 0; size -= pageSize, vaddr += pageSize) { 127 if (pTable.find(vaddr) != pTable.end()) { 128 return false; 129 } 130 } 131 132 return true; 133} 134 135bool 136PageTable::lookup(Addr vaddr, TheISA::TlbEntry &entry) 137{ 138 Addr page_addr = pageAlign(vaddr); 139 140 if (pTableCache[0].vaddr == page_addr) { 141 entry = pTableCache[0].entry; 142 return true; 143 } 144 if (pTableCache[1].vaddr == page_addr) { 145 entry = pTableCache[1].entry; 146 return true; 147 } 148 if (pTableCache[2].vaddr == page_addr) { 149 entry = pTableCache[2].entry; 150 return true; 151 } 152 153 PTableItr iter = pTable.find(page_addr); 154 155 if (iter == pTable.end()) { 156 return false; 157 } 158 159 updateCache(page_addr, iter->second); 160 entry = iter->second; 161 return true; 162} 163 164bool 165PageTable::translate(Addr vaddr, Addr &paddr) 166{ 167 TheISA::TlbEntry entry; 168 if (!lookup(vaddr, entry)) { 169 DPRINTF(MMU, "Couldn't Translate: %#x\n", vaddr); 170 return false; 171 } 172 paddr = pageOffset(vaddr) + entry.pageStart(); 173 DPRINTF(MMU, "Translating: %#x->%#x\n", vaddr, paddr); 174 return true; 175} 176 177Fault 178PageTable::translate(RequestPtr req) 179{ 180 Addr paddr; 181 assert(pageAlign(req->getVaddr() + req->getSize() - 1) 182 == pageAlign(req->getVaddr())); 183 if (!translate(req->getVaddr(), paddr)) { 184 return Fault(new GenericPageTableFault(req->getVaddr())); 185 } 186 req->setPaddr(paddr); 187 if ((paddr & (pageSize - 1)) + req->getSize() > pageSize) { 188 panic("Request spans page boundaries!\n"); 189 return NoFault; 190 } 191 return NoFault; 192} 193 194void 195PageTable::serialize(std::ostream &os) 196{ 197 paramOut(os, "ptable.size", pTable.size()); 198 199 PTable::size_type count = 0; 200 201 PTableItr iter = pTable.begin(); 202 PTableItr end = pTable.end(); 203 while (iter != end) { 204 os << "\n[" << csprintf("%s.Entry%d", name(), count) << "]\n"; 205 206 paramOut(os, "vaddr", iter->first); 207 iter->second.serialize(os); 208 209 ++iter; 210 ++count; 211 } 212 assert(count == pTable.size()); 213} 214 215void 216PageTable::unserialize(Checkpoint *cp, const std::string §ion) 217{ 218 int i = 0, count; 219 paramIn(cp, section, "ptable.size", count); 220 Addr vaddr; 221 TheISA::TlbEntry *entry; 222 223 pTable.clear(); 224 225 while(i < count) { 226 paramIn(cp, csprintf("%s.Entry%d", name(), i), "vaddr", vaddr); 227 entry = new TheISA::TlbEntry(); 228 entry->unserialize(cp, csprintf("%s.Entry%d", name(), i)); 229 pTable[vaddr] = *entry; 230 ++i; 231 } 232} 233 234