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/process.hh" 49#include "sim/sim_object.hh" 50#include "sim/system.hh" 51 52using namespace std; 53using namespace TheISA; 54
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55PageTable::PageTable(
56#if !FULL_SYSTEM
57 Process *_process,
58#endif
59 Addr _pageSize)
60 : pageSize(_pageSize), offsetMask(mask(floorLog2(_pageSize)))
61#if !FULL_SYSTEM
62 , process(_process)
63#endif
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55PageTable::PageTable(Process *_process, Addr _pageSize) 56 : pageSize(_pageSize), offsetMask(mask(floorLog2(_pageSize))), 57 process(_process) |
58{ 59 assert(isPowerOf2(pageSize)); 60 pTableCache[0].vaddr = 0; 61 pTableCache[1].vaddr = 0; 62 pTableCache[2].vaddr = 0; 63} 64 65PageTable::~PageTable() 66{ 67} 68 69void 70PageTable::allocate(Addr vaddr, int64_t size) 71{ 72 // starting address must be page aligned 73 assert(pageOffset(vaddr) == 0); 74 75 DPRINTF(MMU, "Allocating Page: %#x-%#x\n", vaddr, vaddr+ size); 76 77 for (; size > 0; size -= pageSize, vaddr += pageSize) { 78 PTableItr iter = pTable.find(vaddr); 79 80 if (iter != pTable.end()) { 81 // already mapped 82 fatal("PageTable::allocate: address 0x%x already mapped", 83 vaddr); 84 } 85
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92#if !FULL_SYSTEM
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86 pTable[vaddr] = TheISA::TlbEntry(process->M5_pid, vaddr, 87 process->system->new_page()); 88 updateCache(vaddr, pTable[vaddr]);
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96#endif
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89 } 90} 91 92void 93PageTable::remap(Addr vaddr, int64_t size, Addr new_vaddr) 94{ 95 assert(pageOffset(vaddr) == 0); 96 assert(pageOffset(new_vaddr) == 0); 97 98 DPRINTF(MMU, "moving pages from vaddr %08p to %08p, size = %d\n", vaddr, 99 new_vaddr, size); 100 101 for (; size > 0; size -= pageSize, vaddr += pageSize, new_vaddr += pageSize) { 102 PTableItr iter = pTable.find(vaddr); 103 104 assert(iter != pTable.end()); 105 106 pTable[new_vaddr] = pTable[vaddr]; 107 pTable.erase(vaddr); 108 pTable[new_vaddr].updateVaddr(new_vaddr); 109 updateCache(new_vaddr, pTable[new_vaddr]); 110 } 111} 112 113void 114PageTable::deallocate(Addr vaddr, int64_t size) 115{ 116 assert(pageOffset(vaddr) == 0); 117 118 DPRINTF(MMU, "Deallocating page: %#x-%#x\n", vaddr, vaddr+ size); 119 120 for (; size > 0; size -= pageSize, vaddr += pageSize) { 121 PTableItr iter = pTable.find(vaddr); 122 123 assert(iter != pTable.end()); 124 125 pTable.erase(vaddr); 126 } 127 128} 129 130bool 131PageTable::lookup(Addr vaddr, TheISA::TlbEntry &entry) 132{ 133 Addr page_addr = pageAlign(vaddr); 134 135 if (pTableCache[0].vaddr == page_addr) { 136 entry = pTableCache[0].entry; 137 return true; 138 } 139 if (pTableCache[1].vaddr == page_addr) { 140 entry = pTableCache[1].entry; 141 return true; 142 } 143 if (pTableCache[2].vaddr == page_addr) { 144 entry = pTableCache[2].entry; 145 return true; 146 } 147 148 PTableItr iter = pTable.find(page_addr); 149 150 if (iter == pTable.end()) { 151 return false; 152 } 153 154 updateCache(page_addr, iter->second); 155 entry = iter->second; 156 return true; 157} 158 159bool 160PageTable::translate(Addr vaddr, Addr &paddr) 161{ 162 TheISA::TlbEntry entry; 163 if (!lookup(vaddr, entry)) { 164 DPRINTF(MMU, "Couldn't Translate: %#x\n", vaddr); 165 return false; 166 } 167 paddr = pageOffset(vaddr) + entry.pageStart(); 168 DPRINTF(MMU, "Translating: %#x->%#x\n", vaddr, paddr); 169 return true; 170} 171 172Fault 173PageTable::translate(RequestPtr req) 174{ 175 Addr paddr; 176 assert(pageAlign(req->getVaddr() + req->getSize() - 1) 177 == pageAlign(req->getVaddr())); 178 if (!translate(req->getVaddr(), paddr)) { 179 return Fault(new GenericPageTableFault(req->getVaddr())); 180 } 181 req->setPaddr(paddr); 182 if ((paddr & (pageSize - 1)) + req->getSize() > pageSize) { 183 panic("Request spans page boundaries!\n"); 184 return NoFault; 185 } 186 return NoFault; 187} 188 189void 190PageTable::serialize(std::ostream &os) 191{ 192 paramOut(os, "ptable.size", pTable.size()); 193 194 PTable::size_type count = 0; 195 196 PTableItr iter = pTable.begin(); 197 PTableItr end = pTable.end(); 198 while (iter != end) {
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207#if !FULL_SYSTEM
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199 os << "\n[" << csprintf("%s.Entry%d", process->name(), count) << "]\n";
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209#endif
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200 201 paramOut(os, "vaddr", iter->first); 202 iter->second.serialize(os); 203 204 ++iter; 205 ++count; 206 } 207 assert(count == pTable.size()); 208} 209 210void 211PageTable::unserialize(Checkpoint *cp, const std::string §ion) 212{ 213 int i = 0, count; 214 paramIn(cp, section, "ptable.size", count); 215 216 pTable.clear(); 217 218 while (i < count) {
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229#if !FULL_SYSTEM
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219 TheISA::TlbEntry *entry; 220 Addr vaddr; 221 222 paramIn(cp, csprintf("%s.Entry%d", process->name(), i), "vaddr", vaddr); 223 entry = new TheISA::TlbEntry(); 224 entry->unserialize(cp, csprintf("%s.Entry%d", process->name(), i)); 225 pTable[vaddr] = *entry; 226 ++i;
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238#endif
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227 } 228} 229
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