page_table.cc revision 9676
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 */ 378229Snate@binkert.org#include <fstream> 388229Snate@binkert.org#include <map> 392379SN/A#include <string> 402379SN/A 412399SN/A#include "base/bitfield.hh" 422379SN/A#include "base/intmath.hh" 432379SN/A#include "base/trace.hh" 446658Snate@binkert.org#include "config/the_isa.hh" 458232Snate@binkert.org#include "debug/MMU.hh" 462379SN/A#include "mem/page_table.hh" 477678Sgblack@eecs.umich.edu#include "sim/faults.hh" 482379SN/A#include "sim/sim_object.hh" 492379SN/A 502399SN/Ausing namespace std; 512423SN/Ausing namespace TheISA; 522399SN/A 538601Ssteve.reinhardt@amd.comPageTable::PageTable(const std::string &__name, uint64_t _pid, Addr _pageSize) 542399SN/A : pageSize(_pageSize), offsetMask(mask(floorLog2(_pageSize))), 558601Ssteve.reinhardt@amd.com pid(_pid), _name(__name) 562379SN/A{ 572399SN/A assert(isPowerOf2(pageSize)); 589676Smitch.hayenga+gem5@gmail.com pTableCache[0].valid = false; 599676Smitch.hayenga+gem5@gmail.com pTableCache[1].valid = false; 609676Smitch.hayenga+gem5@gmail.com pTableCache[2].valid = false; 612379SN/A} 622379SN/A 632379SN/APageTable::~PageTable() 642379SN/A{ 652379SN/A} 662379SN/A 672399SN/Avoid 688601Ssteve.reinhardt@amd.comPageTable::map(Addr vaddr, Addr paddr, int64_t size, bool clobber) 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 758601Ssteve.reinhardt@amd.com for (; size > 0; size -= pageSize, vaddr += pageSize, paddr += pageSize) { 768600Ssteve.reinhardt@amd.com if (!clobber && (pTable.find(vaddr) != pTable.end())) { 772399SN/A // already mapped 788600Ssteve.reinhardt@amd.com fatal("PageTable::allocate: address 0x%x already mapped", vaddr); 792399SN/A } 802399SN/A 818601Ssteve.reinhardt@amd.com pTable[vaddr] = TheISA::TlbEntry(pid, vaddr, paddr); 829676Smitch.hayenga+gem5@gmail.com eraseCacheEntry(vaddr); 834521Ssaidi@eecs.umich.edu updateCache(vaddr, pTable[vaddr]); 842399SN/A } 852399SN/A} 862399SN/A 875877Shsul@eecs.umich.eduvoid 885877Shsul@eecs.umich.eduPageTable::remap(Addr vaddr, int64_t size, Addr new_vaddr) 895877Shsul@eecs.umich.edu{ 905877Shsul@eecs.umich.edu assert(pageOffset(vaddr) == 0); 915877Shsul@eecs.umich.edu assert(pageOffset(new_vaddr) == 0); 925877Shsul@eecs.umich.edu 935877Shsul@eecs.umich.edu DPRINTF(MMU, "moving pages from vaddr %08p to %08p, size = %d\n", vaddr, 945877Shsul@eecs.umich.edu new_vaddr, size); 955877Shsul@eecs.umich.edu 965877Shsul@eecs.umich.edu for (; size > 0; size -= pageSize, vaddr += pageSize, new_vaddr += pageSize) { 978641Snate@binkert.org assert(pTable.find(vaddr) != pTable.end()); 985877Shsul@eecs.umich.edu 995877Shsul@eecs.umich.edu pTable[new_vaddr] = pTable[vaddr]; 1005877Shsul@eecs.umich.edu pTable.erase(vaddr); 1019676Smitch.hayenga+gem5@gmail.com eraseCacheEntry(vaddr); 1025877Shsul@eecs.umich.edu pTable[new_vaddr].updateVaddr(new_vaddr); 1035877Shsul@eecs.umich.edu updateCache(new_vaddr, pTable[new_vaddr]); 1045877Shsul@eecs.umich.edu } 1055877Shsul@eecs.umich.edu} 1065877Shsul@eecs.umich.edu 1075877Shsul@eecs.umich.eduvoid 1088601Ssteve.reinhardt@amd.comPageTable::unmap(Addr vaddr, int64_t size) 1095877Shsul@eecs.umich.edu{ 1105877Shsul@eecs.umich.edu assert(pageOffset(vaddr) == 0); 1115877Shsul@eecs.umich.edu 1128601Ssteve.reinhardt@amd.com DPRINTF(MMU, "Unmapping page: %#x-%#x\n", vaddr, vaddr+ size); 1135877Shsul@eecs.umich.edu 1145877Shsul@eecs.umich.edu for (; size > 0; size -= pageSize, vaddr += pageSize) { 1158641Snate@binkert.org assert(pTable.find(vaddr) != pTable.end()); 1165877Shsul@eecs.umich.edu pTable.erase(vaddr); 1179676Smitch.hayenga+gem5@gmail.com eraseCacheEntry(vaddr); 1185877Shsul@eecs.umich.edu } 1195877Shsul@eecs.umich.edu 1205877Shsul@eecs.umich.edu} 1215877Shsul@eecs.umich.edu 1222399SN/Abool 1238600Ssteve.reinhardt@amd.comPageTable::isUnmapped(Addr vaddr, int64_t size) 1248600Ssteve.reinhardt@amd.com{ 1258600Ssteve.reinhardt@amd.com // starting address must be page aligned 1268600Ssteve.reinhardt@amd.com assert(pageOffset(vaddr) == 0); 1278600Ssteve.reinhardt@amd.com 1288600Ssteve.reinhardt@amd.com for (; size > 0; size -= pageSize, vaddr += pageSize) { 1298600Ssteve.reinhardt@amd.com if (pTable.find(vaddr) != pTable.end()) { 1308600Ssteve.reinhardt@amd.com return false; 1318600Ssteve.reinhardt@amd.com } 1328600Ssteve.reinhardt@amd.com } 1338600Ssteve.reinhardt@amd.com 1348600Ssteve.reinhardt@amd.com return true; 1358600Ssteve.reinhardt@amd.com} 1368600Ssteve.reinhardt@amd.com 1378600Ssteve.reinhardt@amd.combool 1385004Sgblack@eecs.umich.eduPageTable::lookup(Addr vaddr, TheISA::TlbEntry &entry) 1392399SN/A{ 1402399SN/A Addr page_addr = pageAlign(vaddr); 1412809Ssaidi@eecs.umich.edu 1429676Smitch.hayenga+gem5@gmail.com if (pTableCache[0].valid && pTableCache[0].vaddr == page_addr) { 1435004Sgblack@eecs.umich.edu entry = pTableCache[0].entry; 1442809Ssaidi@eecs.umich.edu return true; 1452809Ssaidi@eecs.umich.edu } 1469676Smitch.hayenga+gem5@gmail.com if (pTableCache[1].valid && pTableCache[1].vaddr == page_addr) { 1475004Sgblack@eecs.umich.edu entry = pTableCache[1].entry; 1482809Ssaidi@eecs.umich.edu return true; 1492809Ssaidi@eecs.umich.edu } 1509676Smitch.hayenga+gem5@gmail.com if (pTableCache[2].valid && pTableCache[2].vaddr == page_addr) { 1515004Sgblack@eecs.umich.edu entry = pTableCache[2].entry; 1522809Ssaidi@eecs.umich.edu return true; 1532809Ssaidi@eecs.umich.edu } 1542809Ssaidi@eecs.umich.edu 1555004Sgblack@eecs.umich.edu PTableItr iter = pTable.find(page_addr); 1562399SN/A 1572399SN/A if (iter == pTable.end()) { 1582399SN/A return false; 1592399SN/A } 1602399SN/A 1614521Ssaidi@eecs.umich.edu updateCache(page_addr, iter->second); 1625004Sgblack@eecs.umich.edu entry = iter->second; 1632399SN/A return true; 1642399SN/A} 1652399SN/A 1665004Sgblack@eecs.umich.edubool 1675004Sgblack@eecs.umich.eduPageTable::translate(Addr vaddr, Addr &paddr) 1685004Sgblack@eecs.umich.edu{ 1695004Sgblack@eecs.umich.edu TheISA::TlbEntry entry; 1705183Ssaidi@eecs.umich.edu if (!lookup(vaddr, entry)) { 1715183Ssaidi@eecs.umich.edu DPRINTF(MMU, "Couldn't Translate: %#x\n", vaddr); 1725004Sgblack@eecs.umich.edu return false; 1735183Ssaidi@eecs.umich.edu } 1745184Sgblack@eecs.umich.edu paddr = pageOffset(vaddr) + entry.pageStart(); 1755183Ssaidi@eecs.umich.edu DPRINTF(MMU, "Translating: %#x->%#x\n", vaddr, paddr); 1765004Sgblack@eecs.umich.edu return true; 1775004Sgblack@eecs.umich.edu} 1782399SN/A 1792394SN/AFault 1805004Sgblack@eecs.umich.eduPageTable::translate(RequestPtr req) 1812394SN/A{ 1822532SN/A Addr paddr; 1832532SN/A assert(pageAlign(req->getVaddr() + req->getSize() - 1) 1842532SN/A == pageAlign(req->getVaddr())); 1852532SN/A if (!translate(req->getVaddr(), paddr)) { 1865004Sgblack@eecs.umich.edu return Fault(new GenericPageTableFault(req->getVaddr())); 1872399SN/A } 1882532SN/A req->setPaddr(paddr); 1895004Sgblack@eecs.umich.edu if ((paddr & (pageSize - 1)) + req->getSize() > pageSize) { 1905004Sgblack@eecs.umich.edu panic("Request spans page boundaries!\n"); 1915004Sgblack@eecs.umich.edu return NoFault; 1925004Sgblack@eecs.umich.edu } 1935004Sgblack@eecs.umich.edu return NoFault; 1942394SN/A} 1953311Ssaidi@eecs.umich.edu 1963311Ssaidi@eecs.umich.eduvoid 1973311Ssaidi@eecs.umich.eduPageTable::serialize(std::ostream &os) 1983311Ssaidi@eecs.umich.edu{ 1993311Ssaidi@eecs.umich.edu paramOut(os, "ptable.size", pTable.size()); 2003320Shsul@eecs.umich.edu 2016227Snate@binkert.org PTable::size_type count = 0; 2023311Ssaidi@eecs.umich.edu 2035004Sgblack@eecs.umich.edu PTableItr iter = pTable.begin(); 2045004Sgblack@eecs.umich.edu PTableItr end = pTable.end(); 2053347Sbinkertn@umich.edu while (iter != end) { 2068601Ssteve.reinhardt@amd.com os << "\n[" << csprintf("%s.Entry%d", name(), count) << "]\n"; 2075183Ssaidi@eecs.umich.edu 2085183Ssaidi@eecs.umich.edu paramOut(os, "vaddr", iter->first); 2095004Sgblack@eecs.umich.edu iter->second.serialize(os); 2103347Sbinkertn@umich.edu 2113347Sbinkertn@umich.edu ++iter; 2123347Sbinkertn@umich.edu ++count; 2133311Ssaidi@eecs.umich.edu } 2143311Ssaidi@eecs.umich.edu assert(count == pTable.size()); 2153311Ssaidi@eecs.umich.edu} 2163311Ssaidi@eecs.umich.edu 2173311Ssaidi@eecs.umich.eduvoid 2183311Ssaidi@eecs.umich.eduPageTable::unserialize(Checkpoint *cp, const std::string §ion) 2193311Ssaidi@eecs.umich.edu{ 2203311Ssaidi@eecs.umich.edu int i = 0, count; 2213311Ssaidi@eecs.umich.edu paramIn(cp, section, "ptable.size", count); 2223311Ssaidi@eecs.umich.edu 2233311Ssaidi@eecs.umich.edu pTable.clear(); 2243311Ssaidi@eecs.umich.edu 2258763Sgblack@eecs.umich.edu while (i < count) { 2268763Sgblack@eecs.umich.edu TheISA::TlbEntry *entry; 2278763Sgblack@eecs.umich.edu Addr vaddr; 2288763Sgblack@eecs.umich.edu 2298601Ssteve.reinhardt@amd.com paramIn(cp, csprintf("%s.Entry%d", name(), i), "vaddr", vaddr); 2305183Ssaidi@eecs.umich.edu entry = new TheISA::TlbEntry(); 2318601Ssteve.reinhardt@amd.com entry->unserialize(cp, csprintf("%s.Entry%d", name(), i)); 2325183Ssaidi@eecs.umich.edu pTable[vaddr] = *entry; 2339086Sandreas.hansson@arm.com delete entry; 2343311Ssaidi@eecs.umich.edu ++i; 2356818SLisa.Hsu@amd.com } 2363311Ssaidi@eecs.umich.edu} 2373311Ssaidi@eecs.umich.edu 238