page_table.cc revision 5248
12379SN/A/* 22379SN/A * Copyright (c) 2003 The Regents of The University of Michigan 32379SN/A * All rights reserved. 42379SN/A * 52379SN/A * Redistribution and use in source and binary forms, with or without 62379SN/A * modification, are permitted provided that the following conditions are 72379SN/A * met: redistributions of source code must retain the above copyright 82379SN/A * notice, this list of conditions and the following disclaimer; 92379SN/A * redistributions in binary form must reproduce the above copyright 102379SN/A * notice, this list of conditions and the following disclaimer in the 112379SN/A * documentation and/or other materials provided with the distribution; 122379SN/A * neither the name of the copyright holders nor the names of its 132379SN/A * contributors may be used to endorse or promote products derived from 142379SN/A * this software without specific prior written permission. 152379SN/A * 162379SN/A * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 172379SN/A * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 182379SN/A * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 192379SN/A * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 202379SN/A * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 212379SN/A * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 222379SN/A * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 232379SN/A * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 242379SN/A * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 252379SN/A * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 262379SN/A * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 272665Ssaidi@eecs.umich.edu * 282665Ssaidi@eecs.umich.edu * Authors: Steve Reinhardt 292665Ssaidi@eecs.umich.edu * Ron Dreslinski 303311Ssaidi@eecs.umich.edu * Ali Saidi 312379SN/A */ 322379SN/A 332379SN/A/** 342379SN/A * @file 352379SN/A * Definitions of page table. 362379SN/A */ 372379SN/A#include <string> 382379SN/A#include <map> 392379SN/A#include <fstream> 402379SN/A 412423SN/A#include "arch/faults.hh" 422399SN/A#include "base/bitfield.hh" 432379SN/A#include "base/intmath.hh" 442379SN/A#include "base/trace.hh" 452379SN/A#include "mem/page_table.hh" 465184Sgblack@eecs.umich.edu#include "sim/process.hh" 472379SN/A#include "sim/sim_object.hh" 482399SN/A#include "sim/system.hh" 492379SN/A 502399SN/Ausing namespace std; 512423SN/Ausing namespace TheISA; 522399SN/A 535184Sgblack@eecs.umich.eduPageTable::PageTable(Process *_process, Addr _pageSize) 542399SN/A : pageSize(_pageSize), offsetMask(mask(floorLog2(_pageSize))), 555184Sgblack@eecs.umich.edu process(_process) 562379SN/A{ 572399SN/A assert(isPowerOf2(pageSize)); 582809Ssaidi@eecs.umich.edu pTableCache[0].vaddr = 0; 592809Ssaidi@eecs.umich.edu pTableCache[1].vaddr = 0; 602809Ssaidi@eecs.umich.edu pTableCache[2].vaddr = 0; 612379SN/A} 622379SN/A 632379SN/APageTable::~PageTable() 642379SN/A{ 652379SN/A} 662379SN/A 672399SN/Avoid 682979Sgblack@eecs.umich.eduPageTable::allocate(Addr vaddr, int64_t size) 692399SN/A{ 702399SN/A // starting address must be page aligned 712399SN/A assert(pageOffset(vaddr) == 0); 722399SN/A 733311Ssaidi@eecs.umich.edu DPRINTF(MMU, "Allocating Page: %#x-%#x\n", vaddr, vaddr+ size); 743311Ssaidi@eecs.umich.edu 752399SN/A for (; size > 0; size -= pageSize, vaddr += pageSize) { 765004Sgblack@eecs.umich.edu PTableItr iter = pTable.find(vaddr); 772399SN/A 782399SN/A if (iter != pTable.end()) { 792399SN/A // already mapped 805004Sgblack@eecs.umich.edu fatal("PageTable::allocate: address 0x%x already mapped", 815004Sgblack@eecs.umich.edu vaddr); 822399SN/A } 832399SN/A 845184Sgblack@eecs.umich.edu pTable[vaddr] = TheISA::TlbEntry(process->M5_pid, vaddr, 855184Sgblack@eecs.umich.edu process->system->new_page()); 864521Ssaidi@eecs.umich.edu updateCache(vaddr, pTable[vaddr]); 872399SN/A } 882399SN/A} 892399SN/A 902399SN/Abool 915004Sgblack@eecs.umich.eduPageTable::lookup(Addr vaddr, TheISA::TlbEntry &entry) 922399SN/A{ 932399SN/A Addr page_addr = pageAlign(vaddr); 942809Ssaidi@eecs.umich.edu 954521Ssaidi@eecs.umich.edu if (pTableCache[0].vaddr == page_addr) { 965004Sgblack@eecs.umich.edu entry = pTableCache[0].entry; 972809Ssaidi@eecs.umich.edu return true; 982809Ssaidi@eecs.umich.edu } 994521Ssaidi@eecs.umich.edu if (pTableCache[1].vaddr == page_addr) { 1005004Sgblack@eecs.umich.edu entry = pTableCache[1].entry; 1012809Ssaidi@eecs.umich.edu return true; 1022809Ssaidi@eecs.umich.edu } 1034521Ssaidi@eecs.umich.edu if (pTableCache[2].vaddr == page_addr) { 1045004Sgblack@eecs.umich.edu entry = pTableCache[2].entry; 1052809Ssaidi@eecs.umich.edu return true; 1062809Ssaidi@eecs.umich.edu } 1072809Ssaidi@eecs.umich.edu 1085004Sgblack@eecs.umich.edu PTableItr iter = pTable.find(page_addr); 1092399SN/A 1102399SN/A if (iter == pTable.end()) { 1112399SN/A return false; 1122399SN/A } 1132399SN/A 1144521Ssaidi@eecs.umich.edu updateCache(page_addr, iter->second); 1155004Sgblack@eecs.umich.edu entry = iter->second; 1162399SN/A return true; 1172399SN/A} 1182399SN/A 1195004Sgblack@eecs.umich.edubool 1205004Sgblack@eecs.umich.eduPageTable::translate(Addr vaddr, Addr &paddr) 1215004Sgblack@eecs.umich.edu{ 1225004Sgblack@eecs.umich.edu TheISA::TlbEntry entry; 1235183Ssaidi@eecs.umich.edu if (!lookup(vaddr, entry)) { 1245183Ssaidi@eecs.umich.edu DPRINTF(MMU, "Couldn't Translate: %#x\n", vaddr); 1255004Sgblack@eecs.umich.edu return false; 1265183Ssaidi@eecs.umich.edu } 1275184Sgblack@eecs.umich.edu paddr = pageOffset(vaddr) + entry.pageStart(); 1285183Ssaidi@eecs.umich.edu DPRINTF(MMU, "Translating: %#x->%#x\n", vaddr, paddr); 1295004Sgblack@eecs.umich.edu return true; 1305004Sgblack@eecs.umich.edu} 1312399SN/A 1322394SN/AFault 1335004Sgblack@eecs.umich.eduPageTable::translate(RequestPtr req) 1342394SN/A{ 1352532SN/A Addr paddr; 1362532SN/A assert(pageAlign(req->getVaddr() + req->getSize() - 1) 1372532SN/A == pageAlign(req->getVaddr())); 1382532SN/A if (!translate(req->getVaddr(), paddr)) { 1395004Sgblack@eecs.umich.edu return Fault(new GenericPageTableFault(req->getVaddr())); 1402399SN/A } 1412532SN/A req->setPaddr(paddr); 1425004Sgblack@eecs.umich.edu if ((paddr & (pageSize - 1)) + req->getSize() > pageSize) { 1435004Sgblack@eecs.umich.edu panic("Request spans page boundaries!\n"); 1445004Sgblack@eecs.umich.edu return NoFault; 1455004Sgblack@eecs.umich.edu } 1465004Sgblack@eecs.umich.edu return NoFault; 1472394SN/A} 1483311Ssaidi@eecs.umich.edu 1493311Ssaidi@eecs.umich.eduvoid 1503311Ssaidi@eecs.umich.eduPageTable::serialize(std::ostream &os) 1513311Ssaidi@eecs.umich.edu{ 1523311Ssaidi@eecs.umich.edu paramOut(os, "ptable.size", pTable.size()); 1533320Shsul@eecs.umich.edu 1543311Ssaidi@eecs.umich.edu int count = 0; 1553311Ssaidi@eecs.umich.edu 1565004Sgblack@eecs.umich.edu PTableItr iter = pTable.begin(); 1575004Sgblack@eecs.umich.edu PTableItr end = pTable.end(); 1583347Sbinkertn@umich.edu while (iter != end) { 1595248Ssaidi@eecs.umich.edu os << "\n[" << csprintf("%s.Entry%d", process->name(), count) << "]\n"; 1605183Ssaidi@eecs.umich.edu 1615183Ssaidi@eecs.umich.edu paramOut(os, "vaddr", iter->first); 1625004Sgblack@eecs.umich.edu iter->second.serialize(os); 1633347Sbinkertn@umich.edu 1643347Sbinkertn@umich.edu ++iter; 1653347Sbinkertn@umich.edu ++count; 1663311Ssaidi@eecs.umich.edu } 1673311Ssaidi@eecs.umich.edu assert(count == pTable.size()); 1683311Ssaidi@eecs.umich.edu} 1693311Ssaidi@eecs.umich.edu 1703311Ssaidi@eecs.umich.eduvoid 1713311Ssaidi@eecs.umich.eduPageTable::unserialize(Checkpoint *cp, const std::string §ion) 1723311Ssaidi@eecs.umich.edu{ 1733311Ssaidi@eecs.umich.edu int i = 0, count; 1743311Ssaidi@eecs.umich.edu paramIn(cp, section, "ptable.size", count); 1755004Sgblack@eecs.umich.edu Addr vaddr; 1765183Ssaidi@eecs.umich.edu TheISA::TlbEntry *entry; 1773311Ssaidi@eecs.umich.edu 1783311Ssaidi@eecs.umich.edu pTable.clear(); 1793311Ssaidi@eecs.umich.edu 1803311Ssaidi@eecs.umich.edu while(i < count) { 1815248Ssaidi@eecs.umich.edu paramIn(cp, csprintf("%s.Entry%d", process->name(), i), "vaddr", vaddr); 1825183Ssaidi@eecs.umich.edu entry = new TheISA::TlbEntry(); 1835248Ssaidi@eecs.umich.edu entry->unserialize(cp, csprintf("%s.Entry%d", process->name(), i)); 1845183Ssaidi@eecs.umich.edu pTable[vaddr] = *entry; 1853311Ssaidi@eecs.umich.edu ++i; 1863311Ssaidi@eecs.umich.edu } 1873311Ssaidi@eecs.umich.edu} 1883311Ssaidi@eecs.umich.edu 189