pagetable_walker.cc revision 8949
15245Sgblack@eecs.umich.edu/* 28948Sandreas.hansson@arm.com * Copyright (c) 2012 ARM Limited 38948Sandreas.hansson@arm.com * All rights reserved. 48948Sandreas.hansson@arm.com * 58948Sandreas.hansson@arm.com * The license below extends only to copyright in the software and shall 68948Sandreas.hansson@arm.com * not be construed as granting a license to any other intellectual 78948Sandreas.hansson@arm.com * property including but not limited to intellectual property relating 88948Sandreas.hansson@arm.com * to a hardware implementation of the functionality of the software 98948Sandreas.hansson@arm.com * licensed hereunder. You may use the software subject to the license 108948Sandreas.hansson@arm.com * terms below provided that you ensure that this notice is replicated 118948Sandreas.hansson@arm.com * unmodified and in its entirety in all distributions of the software, 128948Sandreas.hansson@arm.com * modified or unmodified, in source code or in binary form. 138948Sandreas.hansson@arm.com * 145245Sgblack@eecs.umich.edu * Copyright (c) 2007 The Hewlett-Packard Development Company 155245Sgblack@eecs.umich.edu * All rights reserved. 165245Sgblack@eecs.umich.edu * 177087Snate@binkert.org * The license below extends only to copyright in the software and shall 187087Snate@binkert.org * not be construed as granting a license to any other intellectual 197087Snate@binkert.org * property including but not limited to intellectual property relating 207087Snate@binkert.org * to a hardware implementation of the functionality of the software 217087Snate@binkert.org * licensed hereunder. You may use the software subject to the license 227087Snate@binkert.org * terms below provided that you ensure that this notice is replicated 237087Snate@binkert.org * unmodified and in its entirety in all distributions of the software, 247087Snate@binkert.org * modified or unmodified, in source code or in binary form. 255245Sgblack@eecs.umich.edu * 267087Snate@binkert.org * Redistribution and use in source and binary forms, with or without 277087Snate@binkert.org * modification, are permitted provided that the following conditions are 287087Snate@binkert.org * met: redistributions of source code must retain the above copyright 297087Snate@binkert.org * notice, this list of conditions and the following disclaimer; 307087Snate@binkert.org * redistributions in binary form must reproduce the above copyright 317087Snate@binkert.org * notice, this list of conditions and the following disclaimer in the 327087Snate@binkert.org * documentation and/or other materials provided with the distribution; 337087Snate@binkert.org * neither the name of the copyright holders nor the names of its 345245Sgblack@eecs.umich.edu * contributors may be used to endorse or promote products derived from 357087Snate@binkert.org * this software without specific prior written permission. 365245Sgblack@eecs.umich.edu * 375245Sgblack@eecs.umich.edu * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 385245Sgblack@eecs.umich.edu * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 395245Sgblack@eecs.umich.edu * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 405245Sgblack@eecs.umich.edu * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 415245Sgblack@eecs.umich.edu * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 425245Sgblack@eecs.umich.edu * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 435245Sgblack@eecs.umich.edu * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 445245Sgblack@eecs.umich.edu * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 455245Sgblack@eecs.umich.edu * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 465245Sgblack@eecs.umich.edu * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 475245Sgblack@eecs.umich.edu * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 485245Sgblack@eecs.umich.edu * 495245Sgblack@eecs.umich.edu * Authors: Gabe Black 505245Sgblack@eecs.umich.edu */ 515245Sgblack@eecs.umich.edu 525245Sgblack@eecs.umich.edu#include "arch/x86/pagetable.hh" 535245Sgblack@eecs.umich.edu#include "arch/x86/pagetable_walker.hh" 545245Sgblack@eecs.umich.edu#include "arch/x86/tlb.hh" 557912Shestness@cs.utexas.edu#include "arch/x86/vtophys.hh" 565245Sgblack@eecs.umich.edu#include "base/bitfield.hh" 578229Snate@binkert.org#include "cpu/base.hh" 585245Sgblack@eecs.umich.edu#include "cpu/thread_context.hh" 598232Snate@binkert.org#include "debug/PageTableWalker.hh" 605245Sgblack@eecs.umich.edu#include "mem/packet_access.hh" 615245Sgblack@eecs.umich.edu#include "mem/request.hh" 625245Sgblack@eecs.umich.edu#include "sim/system.hh" 635245Sgblack@eecs.umich.edu 645245Sgblack@eecs.umich.edunamespace X86ISA { 655245Sgblack@eecs.umich.edu 665245Sgblack@eecs.umich.edu// Unfortunately, the placement of the base field in a page table entry is 675245Sgblack@eecs.umich.edu// very erratic and would make a mess here. It might be moved here at some 685245Sgblack@eecs.umich.edu// point in the future. 695245Sgblack@eecs.umich.eduBitUnion64(PageTableEntry) 705245Sgblack@eecs.umich.edu Bitfield<63> nx; 715245Sgblack@eecs.umich.edu Bitfield<11, 9> avl; 725245Sgblack@eecs.umich.edu Bitfield<8> g; 735245Sgblack@eecs.umich.edu Bitfield<7> ps; 745245Sgblack@eecs.umich.edu Bitfield<6> d; 755245Sgblack@eecs.umich.edu Bitfield<5> a; 765245Sgblack@eecs.umich.edu Bitfield<4> pcd; 775245Sgblack@eecs.umich.edu Bitfield<3> pwt; 785245Sgblack@eecs.umich.edu Bitfield<2> u; 795245Sgblack@eecs.umich.edu Bitfield<1> w; 805245Sgblack@eecs.umich.edu Bitfield<0> p; 815245Sgblack@eecs.umich.eduEndBitUnion(PageTableEntry) 825245Sgblack@eecs.umich.edu 835895Sgblack@eecs.umich.eduFault 847912Shestness@cs.utexas.eduWalker::start(ThreadContext * _tc, BaseTLB::Translation *_translation, 857912Shestness@cs.utexas.edu RequestPtr _req, BaseTLB::Mode _mode) 865245Sgblack@eecs.umich.edu{ 877912Shestness@cs.utexas.edu // TODO: in timing mode, instead of blocking when there are other 887912Shestness@cs.utexas.edu // outstanding requests, see if this request can be coalesced with 897912Shestness@cs.utexas.edu // another one (i.e. either coalesce or start walk) 907912Shestness@cs.utexas.edu WalkerState * newState = new WalkerState(this, _translation, _req); 917912Shestness@cs.utexas.edu newState->initState(_tc, _mode, sys->getMemoryMode() == Enums::timing); 927912Shestness@cs.utexas.edu if (currStates.size()) { 937912Shestness@cs.utexas.edu assert(newState->isTiming()); 947912Shestness@cs.utexas.edu DPRINTF(PageTableWalker, "Walks in progress: %d\n", currStates.size()); 957912Shestness@cs.utexas.edu currStates.push_back(newState); 967912Shestness@cs.utexas.edu return NoFault; 977912Shestness@cs.utexas.edu } else { 987912Shestness@cs.utexas.edu currStates.push_back(newState); 997912Shestness@cs.utexas.edu Fault fault = newState->startWalk(); 1007912Shestness@cs.utexas.edu if (!newState->isTiming()) { 1017912Shestness@cs.utexas.edu currStates.pop_front(); 1027912Shestness@cs.utexas.edu delete newState; 1035895Sgblack@eecs.umich.edu } 1047912Shestness@cs.utexas.edu return fault; 1055245Sgblack@eecs.umich.edu } 1065245Sgblack@eecs.umich.edu} 1075245Sgblack@eecs.umich.edu 1085895Sgblack@eecs.umich.eduFault 1097912Shestness@cs.utexas.eduWalker::startFunctional(ThreadContext * _tc, Addr &addr, Addr &pageSize, 1107912Shestness@cs.utexas.edu BaseTLB::Mode _mode) 1115245Sgblack@eecs.umich.edu{ 1127912Shestness@cs.utexas.edu funcState.initState(_tc, _mode); 1137912Shestness@cs.utexas.edu return funcState.startFunctional(addr, pageSize); 1145245Sgblack@eecs.umich.edu} 1155245Sgblack@eecs.umich.edu 1165245Sgblack@eecs.umich.edubool 1175245Sgblack@eecs.umich.eduWalker::WalkerPort::recvTiming(PacketPtr pkt) 1185245Sgblack@eecs.umich.edu{ 1195245Sgblack@eecs.umich.edu return walker->recvTiming(pkt); 1205245Sgblack@eecs.umich.edu} 1215245Sgblack@eecs.umich.edu 1225245Sgblack@eecs.umich.edubool 1235245Sgblack@eecs.umich.eduWalker::recvTiming(PacketPtr pkt) 1245245Sgblack@eecs.umich.edu{ 1258948Sandreas.hansson@arm.com assert(pkt->isResponse()); 1268948Sandreas.hansson@arm.com WalkerSenderState * senderState = 1278948Sandreas.hansson@arm.com dynamic_cast<WalkerSenderState *>(pkt->senderState); 1288948Sandreas.hansson@arm.com pkt->senderState = senderState->saved; 1298948Sandreas.hansson@arm.com WalkerState * senderWalk = senderState->senderWalk; 1308948Sandreas.hansson@arm.com bool walkComplete = senderWalk->recvPacket(pkt); 1318948Sandreas.hansson@arm.com delete senderState; 1328948Sandreas.hansson@arm.com if (walkComplete) { 1338948Sandreas.hansson@arm.com std::list<WalkerState *>::iterator iter; 1348948Sandreas.hansson@arm.com for (iter = currStates.begin(); iter != currStates.end(); iter++) { 1358948Sandreas.hansson@arm.com WalkerState * walkerState = *(iter); 1368948Sandreas.hansson@arm.com if (walkerState == senderWalk) { 1378948Sandreas.hansson@arm.com iter = currStates.erase(iter); 1388948Sandreas.hansson@arm.com break; 1395895Sgblack@eecs.umich.edu } 1405245Sgblack@eecs.umich.edu } 1418948Sandreas.hansson@arm.com delete senderWalk; 1428948Sandreas.hansson@arm.com // Since we block requests when another is outstanding, we 1438948Sandreas.hansson@arm.com // need to check if there is a waiting request to be serviced 1448948Sandreas.hansson@arm.com if (currStates.size()) { 1458948Sandreas.hansson@arm.com WalkerState * newState = currStates.front(); 1468948Sandreas.hansson@arm.com if (!newState->wasStarted()) 1478948Sandreas.hansson@arm.com newState->startWalk(); 1488948Sandreas.hansson@arm.com } 1495245Sgblack@eecs.umich.edu } 1505245Sgblack@eecs.umich.edu return true; 1515245Sgblack@eecs.umich.edu} 1525245Sgblack@eecs.umich.edu 1535245Sgblack@eecs.umich.eduvoid 1545245Sgblack@eecs.umich.eduWalker::WalkerPort::recvRetry() 1555245Sgblack@eecs.umich.edu{ 1565245Sgblack@eecs.umich.edu walker->recvRetry(); 1575245Sgblack@eecs.umich.edu} 1585245Sgblack@eecs.umich.edu 1595245Sgblack@eecs.umich.eduvoid 1605245Sgblack@eecs.umich.eduWalker::recvRetry() 1615245Sgblack@eecs.umich.edu{ 1627912Shestness@cs.utexas.edu std::list<WalkerState *>::iterator iter; 1637912Shestness@cs.utexas.edu for (iter = currStates.begin(); iter != currStates.end(); iter++) { 1647912Shestness@cs.utexas.edu WalkerState * walkerState = *(iter); 1657912Shestness@cs.utexas.edu if (walkerState->isRetrying()) { 1667912Shestness@cs.utexas.edu walkerState->retry(); 1677912Shestness@cs.utexas.edu } 1687912Shestness@cs.utexas.edu } 1697912Shestness@cs.utexas.edu} 1707912Shestness@cs.utexas.edu 1717912Shestness@cs.utexas.edubool Walker::sendTiming(WalkerState* sendingState, PacketPtr pkt) 1727912Shestness@cs.utexas.edu{ 1737912Shestness@cs.utexas.edu pkt->senderState = new WalkerSenderState(sendingState, pkt->senderState); 1747912Shestness@cs.utexas.edu return port.sendTiming(pkt); 1757912Shestness@cs.utexas.edu} 1767912Shestness@cs.utexas.edu 1778922Swilliam.wang@arm.comMasterPort & 1788922Swilliam.wang@arm.comWalker::getMasterPort(const std::string &if_name, int idx) 1797912Shestness@cs.utexas.edu{ 1807912Shestness@cs.utexas.edu if (if_name == "port") 1818922Swilliam.wang@arm.com return port; 1827912Shestness@cs.utexas.edu else 1838922Swilliam.wang@arm.com return MemObject::getMasterPort(if_name, idx); 1845245Sgblack@eecs.umich.edu} 1855245Sgblack@eecs.umich.edu 1865245Sgblack@eecs.umich.eduvoid 1877912Shestness@cs.utexas.eduWalker::WalkerState::initState(ThreadContext * _tc, 1887912Shestness@cs.utexas.edu BaseTLB::Mode _mode, bool _isTiming) 1897912Shestness@cs.utexas.edu{ 1907912Shestness@cs.utexas.edu assert(state == Ready); 1917912Shestness@cs.utexas.edu started = false; 1927912Shestness@cs.utexas.edu tc = _tc; 1937912Shestness@cs.utexas.edu mode = _mode; 1947912Shestness@cs.utexas.edu timing = _isTiming; 1957912Shestness@cs.utexas.edu} 1967912Shestness@cs.utexas.edu 1977912Shestness@cs.utexas.eduFault 1987912Shestness@cs.utexas.eduWalker::WalkerState::startWalk() 1997912Shestness@cs.utexas.edu{ 2007912Shestness@cs.utexas.edu Fault fault = NoFault; 2017912Shestness@cs.utexas.edu assert(started == false); 2027912Shestness@cs.utexas.edu started = true; 2037912Shestness@cs.utexas.edu setupWalk(req->getVaddr()); 2047912Shestness@cs.utexas.edu if (timing) { 2057912Shestness@cs.utexas.edu nextState = state; 2067912Shestness@cs.utexas.edu state = Waiting; 2077912Shestness@cs.utexas.edu timingFault = NoFault; 2087912Shestness@cs.utexas.edu sendPackets(); 2097912Shestness@cs.utexas.edu } else { 2107912Shestness@cs.utexas.edu do { 2117912Shestness@cs.utexas.edu walker->port.sendAtomic(read); 2127912Shestness@cs.utexas.edu PacketPtr write = NULL; 2137912Shestness@cs.utexas.edu fault = stepWalk(write); 2147912Shestness@cs.utexas.edu assert(fault == NoFault || read == NULL); 2157912Shestness@cs.utexas.edu state = nextState; 2167912Shestness@cs.utexas.edu nextState = Ready; 2177912Shestness@cs.utexas.edu if (write) 2187912Shestness@cs.utexas.edu walker->port.sendAtomic(write); 2197912Shestness@cs.utexas.edu } while(read); 2207912Shestness@cs.utexas.edu state = Ready; 2217912Shestness@cs.utexas.edu nextState = Waiting; 2227912Shestness@cs.utexas.edu } 2237912Shestness@cs.utexas.edu return fault; 2247912Shestness@cs.utexas.edu} 2257912Shestness@cs.utexas.edu 2267912Shestness@cs.utexas.eduFault 2277912Shestness@cs.utexas.eduWalker::WalkerState::startFunctional(Addr &addr, Addr &pageSize) 2287912Shestness@cs.utexas.edu{ 2297912Shestness@cs.utexas.edu Fault fault = NoFault; 2307912Shestness@cs.utexas.edu assert(started == false); 2317912Shestness@cs.utexas.edu started = true; 2327912Shestness@cs.utexas.edu setupWalk(addr); 2337912Shestness@cs.utexas.edu 2347912Shestness@cs.utexas.edu do { 2357912Shestness@cs.utexas.edu walker->port.sendFunctional(read); 2367912Shestness@cs.utexas.edu // On a functional access (page table lookup), writes should 2377912Shestness@cs.utexas.edu // not happen so this pointer is ignored after stepWalk 2387912Shestness@cs.utexas.edu PacketPtr write = NULL; 2397912Shestness@cs.utexas.edu fault = stepWalk(write); 2407912Shestness@cs.utexas.edu assert(fault == NoFault || read == NULL); 2417912Shestness@cs.utexas.edu state = nextState; 2427912Shestness@cs.utexas.edu nextState = Ready; 2437912Shestness@cs.utexas.edu } while(read); 2447912Shestness@cs.utexas.edu pageSize = entry.size; 2457912Shestness@cs.utexas.edu addr = entry.paddr; 2467912Shestness@cs.utexas.edu 2477912Shestness@cs.utexas.edu return fault; 2487912Shestness@cs.utexas.edu} 2497912Shestness@cs.utexas.edu 2507912Shestness@cs.utexas.eduFault 2517912Shestness@cs.utexas.eduWalker::WalkerState::stepWalk(PacketPtr &write) 2527912Shestness@cs.utexas.edu{ 2537912Shestness@cs.utexas.edu assert(state != Ready && state != Waiting); 2547912Shestness@cs.utexas.edu Fault fault = NoFault; 2557912Shestness@cs.utexas.edu write = NULL; 2567912Shestness@cs.utexas.edu PageTableEntry pte; 2577912Shestness@cs.utexas.edu if (dataSize == 8) 2587912Shestness@cs.utexas.edu pte = read->get<uint64_t>(); 2597912Shestness@cs.utexas.edu else 2607912Shestness@cs.utexas.edu pte = read->get<uint32_t>(); 2617912Shestness@cs.utexas.edu VAddr vaddr = entry.vaddr; 2627912Shestness@cs.utexas.edu bool uncacheable = pte.pcd; 2637912Shestness@cs.utexas.edu Addr nextRead = 0; 2647912Shestness@cs.utexas.edu bool doWrite = false; 2657912Shestness@cs.utexas.edu bool doTLBInsert = false; 2667912Shestness@cs.utexas.edu bool doEndWalk = false; 2677912Shestness@cs.utexas.edu bool badNX = pte.nx && mode == BaseTLB::Execute && enableNX; 2687912Shestness@cs.utexas.edu switch(state) { 2697912Shestness@cs.utexas.edu case LongPML4: 2707912Shestness@cs.utexas.edu DPRINTF(PageTableWalker, 2717912Shestness@cs.utexas.edu "Got long mode PML4 entry %#016x.\n", (uint64_t)pte); 2727912Shestness@cs.utexas.edu nextRead = ((uint64_t)pte & (mask(40) << 12)) + vaddr.longl3 * dataSize; 2737912Shestness@cs.utexas.edu doWrite = !pte.a; 2747912Shestness@cs.utexas.edu pte.a = 1; 2757912Shestness@cs.utexas.edu entry.writable = pte.w; 2767912Shestness@cs.utexas.edu entry.user = pte.u; 2777912Shestness@cs.utexas.edu if (badNX || !pte.p) { 2787912Shestness@cs.utexas.edu doEndWalk = true; 2797912Shestness@cs.utexas.edu fault = pageFault(pte.p); 2807912Shestness@cs.utexas.edu break; 2817912Shestness@cs.utexas.edu } 2827912Shestness@cs.utexas.edu entry.noExec = pte.nx; 2837912Shestness@cs.utexas.edu nextState = LongPDP; 2847912Shestness@cs.utexas.edu break; 2857912Shestness@cs.utexas.edu case LongPDP: 2867912Shestness@cs.utexas.edu DPRINTF(PageTableWalker, 2877912Shestness@cs.utexas.edu "Got long mode PDP entry %#016x.\n", (uint64_t)pte); 2887912Shestness@cs.utexas.edu nextRead = ((uint64_t)pte & (mask(40) << 12)) + vaddr.longl2 * dataSize; 2897912Shestness@cs.utexas.edu doWrite = !pte.a; 2907912Shestness@cs.utexas.edu pte.a = 1; 2917912Shestness@cs.utexas.edu entry.writable = entry.writable && pte.w; 2927912Shestness@cs.utexas.edu entry.user = entry.user && pte.u; 2937912Shestness@cs.utexas.edu if (badNX || !pte.p) { 2947912Shestness@cs.utexas.edu doEndWalk = true; 2957912Shestness@cs.utexas.edu fault = pageFault(pte.p); 2967912Shestness@cs.utexas.edu break; 2977912Shestness@cs.utexas.edu } 2987912Shestness@cs.utexas.edu nextState = LongPD; 2997912Shestness@cs.utexas.edu break; 3007912Shestness@cs.utexas.edu case LongPD: 3017912Shestness@cs.utexas.edu DPRINTF(PageTableWalker, 3027912Shestness@cs.utexas.edu "Got long mode PD entry %#016x.\n", (uint64_t)pte); 3037912Shestness@cs.utexas.edu doWrite = !pte.a; 3047912Shestness@cs.utexas.edu pte.a = 1; 3057912Shestness@cs.utexas.edu entry.writable = entry.writable && pte.w; 3067912Shestness@cs.utexas.edu entry.user = entry.user && pte.u; 3077912Shestness@cs.utexas.edu if (badNX || !pte.p) { 3087912Shestness@cs.utexas.edu doEndWalk = true; 3097912Shestness@cs.utexas.edu fault = pageFault(pte.p); 3107912Shestness@cs.utexas.edu break; 3117912Shestness@cs.utexas.edu } 3127912Shestness@cs.utexas.edu if (!pte.ps) { 3137912Shestness@cs.utexas.edu // 4 KB page 3147912Shestness@cs.utexas.edu entry.size = 4 * (1 << 10); 3157912Shestness@cs.utexas.edu nextRead = 3167912Shestness@cs.utexas.edu ((uint64_t)pte & (mask(40) << 12)) + vaddr.longl1 * dataSize; 3177912Shestness@cs.utexas.edu nextState = LongPTE; 3187912Shestness@cs.utexas.edu break; 3197912Shestness@cs.utexas.edu } else { 3207912Shestness@cs.utexas.edu // 2 MB page 3217912Shestness@cs.utexas.edu entry.size = 2 * (1 << 20); 3227912Shestness@cs.utexas.edu entry.paddr = (uint64_t)pte & (mask(31) << 21); 3237912Shestness@cs.utexas.edu entry.uncacheable = uncacheable; 3247912Shestness@cs.utexas.edu entry.global = pte.g; 3257912Shestness@cs.utexas.edu entry.patBit = bits(pte, 12); 3267912Shestness@cs.utexas.edu entry.vaddr = entry.vaddr & ~((2 * (1 << 20)) - 1); 3277912Shestness@cs.utexas.edu doTLBInsert = true; 3287912Shestness@cs.utexas.edu doEndWalk = true; 3297912Shestness@cs.utexas.edu break; 3307912Shestness@cs.utexas.edu } 3317912Shestness@cs.utexas.edu case LongPTE: 3327912Shestness@cs.utexas.edu DPRINTF(PageTableWalker, 3337912Shestness@cs.utexas.edu "Got long mode PTE entry %#016x.\n", (uint64_t)pte); 3347912Shestness@cs.utexas.edu doWrite = !pte.a; 3357912Shestness@cs.utexas.edu pte.a = 1; 3367912Shestness@cs.utexas.edu entry.writable = entry.writable && pte.w; 3377912Shestness@cs.utexas.edu entry.user = entry.user && pte.u; 3387912Shestness@cs.utexas.edu if (badNX || !pte.p) { 3397912Shestness@cs.utexas.edu doEndWalk = true; 3407912Shestness@cs.utexas.edu fault = pageFault(pte.p); 3417912Shestness@cs.utexas.edu break; 3427912Shestness@cs.utexas.edu } 3437912Shestness@cs.utexas.edu entry.paddr = (uint64_t)pte & (mask(40) << 12); 3447912Shestness@cs.utexas.edu entry.uncacheable = uncacheable; 3457912Shestness@cs.utexas.edu entry.global = pte.g; 3467912Shestness@cs.utexas.edu entry.patBit = bits(pte, 12); 3477912Shestness@cs.utexas.edu entry.vaddr = entry.vaddr & ~((4 * (1 << 10)) - 1); 3487912Shestness@cs.utexas.edu doTLBInsert = true; 3497912Shestness@cs.utexas.edu doEndWalk = true; 3507912Shestness@cs.utexas.edu break; 3517912Shestness@cs.utexas.edu case PAEPDP: 3527912Shestness@cs.utexas.edu DPRINTF(PageTableWalker, 3537912Shestness@cs.utexas.edu "Got legacy mode PAE PDP entry %#08x.\n", (uint32_t)pte); 3547912Shestness@cs.utexas.edu nextRead = ((uint64_t)pte & (mask(40) << 12)) + vaddr.pael2 * dataSize; 3557912Shestness@cs.utexas.edu if (!pte.p) { 3567912Shestness@cs.utexas.edu doEndWalk = true; 3577912Shestness@cs.utexas.edu fault = pageFault(pte.p); 3587912Shestness@cs.utexas.edu break; 3597912Shestness@cs.utexas.edu } 3607912Shestness@cs.utexas.edu nextState = PAEPD; 3617912Shestness@cs.utexas.edu break; 3627912Shestness@cs.utexas.edu case PAEPD: 3637912Shestness@cs.utexas.edu DPRINTF(PageTableWalker, 3647912Shestness@cs.utexas.edu "Got legacy mode PAE PD entry %#08x.\n", (uint32_t)pte); 3657912Shestness@cs.utexas.edu doWrite = !pte.a; 3667912Shestness@cs.utexas.edu pte.a = 1; 3677912Shestness@cs.utexas.edu entry.writable = pte.w; 3687912Shestness@cs.utexas.edu entry.user = pte.u; 3697912Shestness@cs.utexas.edu if (badNX || !pte.p) { 3707912Shestness@cs.utexas.edu doEndWalk = true; 3717912Shestness@cs.utexas.edu fault = pageFault(pte.p); 3727912Shestness@cs.utexas.edu break; 3737912Shestness@cs.utexas.edu } 3747912Shestness@cs.utexas.edu if (!pte.ps) { 3757912Shestness@cs.utexas.edu // 4 KB page 3767912Shestness@cs.utexas.edu entry.size = 4 * (1 << 10); 3777912Shestness@cs.utexas.edu nextRead = ((uint64_t)pte & (mask(40) << 12)) + vaddr.pael1 * dataSize; 3787912Shestness@cs.utexas.edu nextState = PAEPTE; 3797912Shestness@cs.utexas.edu break; 3807912Shestness@cs.utexas.edu } else { 3817912Shestness@cs.utexas.edu // 2 MB page 3827912Shestness@cs.utexas.edu entry.size = 2 * (1 << 20); 3837912Shestness@cs.utexas.edu entry.paddr = (uint64_t)pte & (mask(31) << 21); 3847912Shestness@cs.utexas.edu entry.uncacheable = uncacheable; 3857912Shestness@cs.utexas.edu entry.global = pte.g; 3867912Shestness@cs.utexas.edu entry.patBit = bits(pte, 12); 3877912Shestness@cs.utexas.edu entry.vaddr = entry.vaddr & ~((2 * (1 << 20)) - 1); 3887912Shestness@cs.utexas.edu doTLBInsert = true; 3897912Shestness@cs.utexas.edu doEndWalk = true; 3907912Shestness@cs.utexas.edu break; 3917912Shestness@cs.utexas.edu } 3927912Shestness@cs.utexas.edu case PAEPTE: 3937912Shestness@cs.utexas.edu DPRINTF(PageTableWalker, 3947912Shestness@cs.utexas.edu "Got legacy mode PAE PTE entry %#08x.\n", (uint32_t)pte); 3957912Shestness@cs.utexas.edu doWrite = !pte.a; 3967912Shestness@cs.utexas.edu pte.a = 1; 3977912Shestness@cs.utexas.edu entry.writable = entry.writable && pte.w; 3987912Shestness@cs.utexas.edu entry.user = entry.user && pte.u; 3997912Shestness@cs.utexas.edu if (badNX || !pte.p) { 4007912Shestness@cs.utexas.edu doEndWalk = true; 4017912Shestness@cs.utexas.edu fault = pageFault(pte.p); 4027912Shestness@cs.utexas.edu break; 4037912Shestness@cs.utexas.edu } 4047912Shestness@cs.utexas.edu entry.paddr = (uint64_t)pte & (mask(40) << 12); 4057912Shestness@cs.utexas.edu entry.uncacheable = uncacheable; 4067912Shestness@cs.utexas.edu entry.global = pte.g; 4077912Shestness@cs.utexas.edu entry.patBit = bits(pte, 7); 4087912Shestness@cs.utexas.edu entry.vaddr = entry.vaddr & ~((4 * (1 << 10)) - 1); 4097912Shestness@cs.utexas.edu doTLBInsert = true; 4107912Shestness@cs.utexas.edu doEndWalk = true; 4117912Shestness@cs.utexas.edu break; 4127912Shestness@cs.utexas.edu case PSEPD: 4137912Shestness@cs.utexas.edu DPRINTF(PageTableWalker, 4147912Shestness@cs.utexas.edu "Got legacy mode PSE PD entry %#08x.\n", (uint32_t)pte); 4157912Shestness@cs.utexas.edu doWrite = !pte.a; 4167912Shestness@cs.utexas.edu pte.a = 1; 4177912Shestness@cs.utexas.edu entry.writable = pte.w; 4187912Shestness@cs.utexas.edu entry.user = pte.u; 4197912Shestness@cs.utexas.edu if (!pte.p) { 4207912Shestness@cs.utexas.edu doEndWalk = true; 4217912Shestness@cs.utexas.edu fault = pageFault(pte.p); 4227912Shestness@cs.utexas.edu break; 4237912Shestness@cs.utexas.edu } 4247912Shestness@cs.utexas.edu if (!pte.ps) { 4257912Shestness@cs.utexas.edu // 4 KB page 4267912Shestness@cs.utexas.edu entry.size = 4 * (1 << 10); 4277912Shestness@cs.utexas.edu nextRead = 4287912Shestness@cs.utexas.edu ((uint64_t)pte & (mask(20) << 12)) + vaddr.norml2 * dataSize; 4297912Shestness@cs.utexas.edu nextState = PTE; 4307912Shestness@cs.utexas.edu break; 4317912Shestness@cs.utexas.edu } else { 4327912Shestness@cs.utexas.edu // 4 MB page 4337912Shestness@cs.utexas.edu entry.size = 4 * (1 << 20); 4347912Shestness@cs.utexas.edu entry.paddr = bits(pte, 20, 13) << 32 | bits(pte, 31, 22) << 22; 4357912Shestness@cs.utexas.edu entry.uncacheable = uncacheable; 4367912Shestness@cs.utexas.edu entry.global = pte.g; 4377912Shestness@cs.utexas.edu entry.patBit = bits(pte, 12); 4387912Shestness@cs.utexas.edu entry.vaddr = entry.vaddr & ~((4 * (1 << 20)) - 1); 4397912Shestness@cs.utexas.edu doTLBInsert = true; 4407912Shestness@cs.utexas.edu doEndWalk = true; 4417912Shestness@cs.utexas.edu break; 4427912Shestness@cs.utexas.edu } 4437912Shestness@cs.utexas.edu case PD: 4447912Shestness@cs.utexas.edu DPRINTF(PageTableWalker, 4457912Shestness@cs.utexas.edu "Got legacy mode PD entry %#08x.\n", (uint32_t)pte); 4467912Shestness@cs.utexas.edu doWrite = !pte.a; 4477912Shestness@cs.utexas.edu pte.a = 1; 4487912Shestness@cs.utexas.edu entry.writable = pte.w; 4497912Shestness@cs.utexas.edu entry.user = pte.u; 4507912Shestness@cs.utexas.edu if (!pte.p) { 4517912Shestness@cs.utexas.edu doEndWalk = true; 4527912Shestness@cs.utexas.edu fault = pageFault(pte.p); 4537912Shestness@cs.utexas.edu break; 4547912Shestness@cs.utexas.edu } 4557912Shestness@cs.utexas.edu // 4 KB page 4567912Shestness@cs.utexas.edu entry.size = 4 * (1 << 10); 4577912Shestness@cs.utexas.edu nextRead = ((uint64_t)pte & (mask(20) << 12)) + vaddr.norml2 * dataSize; 4587912Shestness@cs.utexas.edu nextState = PTE; 4597912Shestness@cs.utexas.edu break; 4607912Shestness@cs.utexas.edu case PTE: 4617912Shestness@cs.utexas.edu DPRINTF(PageTableWalker, 4627912Shestness@cs.utexas.edu "Got legacy mode PTE entry %#08x.\n", (uint32_t)pte); 4637912Shestness@cs.utexas.edu doWrite = !pte.a; 4647912Shestness@cs.utexas.edu pte.a = 1; 4657912Shestness@cs.utexas.edu entry.writable = pte.w; 4667912Shestness@cs.utexas.edu entry.user = pte.u; 4677912Shestness@cs.utexas.edu if (!pte.p) { 4687912Shestness@cs.utexas.edu doEndWalk = true; 4697912Shestness@cs.utexas.edu fault = pageFault(pte.p); 4707912Shestness@cs.utexas.edu break; 4717912Shestness@cs.utexas.edu } 4727912Shestness@cs.utexas.edu entry.paddr = (uint64_t)pte & (mask(20) << 12); 4737912Shestness@cs.utexas.edu entry.uncacheable = uncacheable; 4747912Shestness@cs.utexas.edu entry.global = pte.g; 4757912Shestness@cs.utexas.edu entry.patBit = bits(pte, 7); 4767912Shestness@cs.utexas.edu entry.vaddr = entry.vaddr & ~((4 * (1 << 10)) - 1); 4777912Shestness@cs.utexas.edu doTLBInsert = true; 4787912Shestness@cs.utexas.edu doEndWalk = true; 4797912Shestness@cs.utexas.edu break; 4807912Shestness@cs.utexas.edu default: 4817912Shestness@cs.utexas.edu panic("Unknown page table walker state %d!\n"); 4827912Shestness@cs.utexas.edu } 4837912Shestness@cs.utexas.edu if (doEndWalk) { 4847912Shestness@cs.utexas.edu if (doTLBInsert) 4857912Shestness@cs.utexas.edu if (!functional) 4867912Shestness@cs.utexas.edu walker->tlb->insert(entry.vaddr, entry); 4877912Shestness@cs.utexas.edu endWalk(); 4887912Shestness@cs.utexas.edu } else { 4897912Shestness@cs.utexas.edu PacketPtr oldRead = read; 4907912Shestness@cs.utexas.edu //If we didn't return, we're setting up another read. 4917912Shestness@cs.utexas.edu Request::Flags flags = oldRead->req->getFlags(); 4927912Shestness@cs.utexas.edu flags.set(Request::UNCACHEABLE, uncacheable); 4937912Shestness@cs.utexas.edu RequestPtr request = 4948832SAli.Saidi@ARM.com new Request(nextRead, oldRead->getSize(), flags, walker->masterId); 4958949Sandreas.hansson@arm.com read = new Packet(request, MemCmd::ReadReq); 4967912Shestness@cs.utexas.edu read->allocate(); 4977912Shestness@cs.utexas.edu // If we need to write, adjust the read packet to write the modified 4987912Shestness@cs.utexas.edu // value back to memory. 4997912Shestness@cs.utexas.edu if (doWrite) { 5007912Shestness@cs.utexas.edu write = oldRead; 5017912Shestness@cs.utexas.edu write->set<uint64_t>(pte); 5027912Shestness@cs.utexas.edu write->cmd = MemCmd::WriteReq; 5038949Sandreas.hansson@arm.com write->clearDest(); 5047912Shestness@cs.utexas.edu } else { 5057912Shestness@cs.utexas.edu write = NULL; 5067912Shestness@cs.utexas.edu delete oldRead->req; 5077912Shestness@cs.utexas.edu delete oldRead; 5087912Shestness@cs.utexas.edu } 5097912Shestness@cs.utexas.edu } 5107912Shestness@cs.utexas.edu return fault; 5117912Shestness@cs.utexas.edu} 5127912Shestness@cs.utexas.edu 5137912Shestness@cs.utexas.eduvoid 5147912Shestness@cs.utexas.eduWalker::WalkerState::endWalk() 5157912Shestness@cs.utexas.edu{ 5167912Shestness@cs.utexas.edu nextState = Ready; 5177912Shestness@cs.utexas.edu delete read->req; 5187912Shestness@cs.utexas.edu delete read; 5197912Shestness@cs.utexas.edu read = NULL; 5207912Shestness@cs.utexas.edu} 5217912Shestness@cs.utexas.edu 5227912Shestness@cs.utexas.eduvoid 5237912Shestness@cs.utexas.eduWalker::WalkerState::setupWalk(Addr vaddr) 5247912Shestness@cs.utexas.edu{ 5257912Shestness@cs.utexas.edu VAddr addr = vaddr; 5267912Shestness@cs.utexas.edu CR3 cr3 = tc->readMiscRegNoEffect(MISCREG_CR3); 5277912Shestness@cs.utexas.edu // Check if we're in long mode or not 5287912Shestness@cs.utexas.edu Efer efer = tc->readMiscRegNoEffect(MISCREG_EFER); 5297912Shestness@cs.utexas.edu dataSize = 8; 5307912Shestness@cs.utexas.edu Addr topAddr; 5317912Shestness@cs.utexas.edu if (efer.lma) { 5327912Shestness@cs.utexas.edu // Do long mode. 5337912Shestness@cs.utexas.edu state = LongPML4; 5347912Shestness@cs.utexas.edu topAddr = (cr3.longPdtb << 12) + addr.longl4 * dataSize; 5357912Shestness@cs.utexas.edu enableNX = efer.nxe; 5367912Shestness@cs.utexas.edu } else { 5377912Shestness@cs.utexas.edu // We're in some flavor of legacy mode. 5387912Shestness@cs.utexas.edu CR4 cr4 = tc->readMiscRegNoEffect(MISCREG_CR4); 5397912Shestness@cs.utexas.edu if (cr4.pae) { 5407912Shestness@cs.utexas.edu // Do legacy PAE. 5417912Shestness@cs.utexas.edu state = PAEPDP; 5427912Shestness@cs.utexas.edu topAddr = (cr3.paePdtb << 5) + addr.pael3 * dataSize; 5437912Shestness@cs.utexas.edu enableNX = efer.nxe; 5447912Shestness@cs.utexas.edu } else { 5457912Shestness@cs.utexas.edu dataSize = 4; 5467912Shestness@cs.utexas.edu topAddr = (cr3.pdtb << 12) + addr.norml2 * dataSize; 5477912Shestness@cs.utexas.edu if (cr4.pse) { 5487912Shestness@cs.utexas.edu // Do legacy PSE. 5497912Shestness@cs.utexas.edu state = PSEPD; 5507912Shestness@cs.utexas.edu } else { 5517912Shestness@cs.utexas.edu // Do legacy non PSE. 5527912Shestness@cs.utexas.edu state = PD; 5537912Shestness@cs.utexas.edu } 5547912Shestness@cs.utexas.edu enableNX = false; 5557912Shestness@cs.utexas.edu } 5567912Shestness@cs.utexas.edu } 5577912Shestness@cs.utexas.edu 5587912Shestness@cs.utexas.edu nextState = Ready; 5597912Shestness@cs.utexas.edu entry.vaddr = vaddr; 5607912Shestness@cs.utexas.edu 5617912Shestness@cs.utexas.edu Request::Flags flags = Request::PHYSICAL; 5627912Shestness@cs.utexas.edu if (cr3.pcd) 5637912Shestness@cs.utexas.edu flags.set(Request::UNCACHEABLE); 5648949Sandreas.hansson@arm.com RequestPtr request = new Request(topAddr, dataSize, flags, 5658949Sandreas.hansson@arm.com walker->masterId); 5668949Sandreas.hansson@arm.com read = new Packet(request, MemCmd::ReadReq); 5677912Shestness@cs.utexas.edu read->allocate(); 5687912Shestness@cs.utexas.edu} 5697912Shestness@cs.utexas.edu 5707912Shestness@cs.utexas.edubool 5717912Shestness@cs.utexas.eduWalker::WalkerState::recvPacket(PacketPtr pkt) 5727912Shestness@cs.utexas.edu{ 5738948Sandreas.hansson@arm.com assert(pkt->isResponse()); 5748948Sandreas.hansson@arm.com if (!pkt->wasNacked()) { 5757912Shestness@cs.utexas.edu assert(inflight); 5767912Shestness@cs.utexas.edu assert(state == Waiting); 5777912Shestness@cs.utexas.edu assert(!read); 5787912Shestness@cs.utexas.edu inflight--; 5797912Shestness@cs.utexas.edu if (pkt->isRead()) { 5807912Shestness@cs.utexas.edu state = nextState; 5817912Shestness@cs.utexas.edu nextState = Ready; 5827912Shestness@cs.utexas.edu PacketPtr write = NULL; 5837912Shestness@cs.utexas.edu read = pkt; 5847912Shestness@cs.utexas.edu timingFault = stepWalk(write); 5857912Shestness@cs.utexas.edu state = Waiting; 5867912Shestness@cs.utexas.edu assert(timingFault == NoFault || read == NULL); 5877912Shestness@cs.utexas.edu if (write) { 5887912Shestness@cs.utexas.edu writes.push_back(write); 5897912Shestness@cs.utexas.edu } 5907912Shestness@cs.utexas.edu sendPackets(); 5917912Shestness@cs.utexas.edu } else { 5927912Shestness@cs.utexas.edu sendPackets(); 5937912Shestness@cs.utexas.edu } 5947912Shestness@cs.utexas.edu if (inflight == 0 && read == NULL && writes.size() == 0) { 5957912Shestness@cs.utexas.edu state = Ready; 5967912Shestness@cs.utexas.edu nextState = Waiting; 5977912Shestness@cs.utexas.edu if (timingFault == NoFault) { 5987912Shestness@cs.utexas.edu /* 5997912Shestness@cs.utexas.edu * Finish the translation. Now that we now the right entry is 6007912Shestness@cs.utexas.edu * in the TLB, this should work with no memory accesses. 6017912Shestness@cs.utexas.edu * There could be new faults unrelated to the table walk like 6027912Shestness@cs.utexas.edu * permissions violations, so we'll need the return value as 6037912Shestness@cs.utexas.edu * well. 6047912Shestness@cs.utexas.edu */ 6057912Shestness@cs.utexas.edu bool delayedResponse; 6067912Shestness@cs.utexas.edu Fault fault = walker->tlb->translate(req, tc, NULL, mode, 6077912Shestness@cs.utexas.edu delayedResponse, true); 6087912Shestness@cs.utexas.edu assert(!delayedResponse); 6097912Shestness@cs.utexas.edu // Let the CPU continue. 6107912Shestness@cs.utexas.edu translation->finish(fault, req, tc, mode); 6117912Shestness@cs.utexas.edu } else { 6127912Shestness@cs.utexas.edu // There was a fault during the walk. Let the CPU know. 6137912Shestness@cs.utexas.edu translation->finish(timingFault, req, tc, mode); 6147912Shestness@cs.utexas.edu } 6157912Shestness@cs.utexas.edu return true; 6167912Shestness@cs.utexas.edu } 6178948Sandreas.hansson@arm.com } else { 6187912Shestness@cs.utexas.edu DPRINTF(PageTableWalker, "Request was nacked. Entering retry state\n"); 6197912Shestness@cs.utexas.edu pkt->reinitNacked(); 6207912Shestness@cs.utexas.edu if (!walker->sendTiming(this, pkt)) { 6217912Shestness@cs.utexas.edu inflight--; 6227912Shestness@cs.utexas.edu retrying = true; 6237912Shestness@cs.utexas.edu if (pkt->isWrite()) { 6247912Shestness@cs.utexas.edu writes.push_back(pkt); 6257912Shestness@cs.utexas.edu } else { 6267912Shestness@cs.utexas.edu assert(!read); 6277912Shestness@cs.utexas.edu read = pkt; 6287912Shestness@cs.utexas.edu } 6297912Shestness@cs.utexas.edu } 6307912Shestness@cs.utexas.edu } 6317912Shestness@cs.utexas.edu return false; 6327912Shestness@cs.utexas.edu} 6337912Shestness@cs.utexas.edu 6347912Shestness@cs.utexas.eduvoid 6357912Shestness@cs.utexas.eduWalker::WalkerState::sendPackets() 6365245Sgblack@eecs.umich.edu{ 6375245Sgblack@eecs.umich.edu //If we're already waiting for the port to become available, just return. 6385245Sgblack@eecs.umich.edu if (retrying) 6395245Sgblack@eecs.umich.edu return; 6405245Sgblack@eecs.umich.edu 6415245Sgblack@eecs.umich.edu //Reads always have priority 6425245Sgblack@eecs.umich.edu if (read) { 6435897Sgblack@eecs.umich.edu PacketPtr pkt = read; 6445897Sgblack@eecs.umich.edu read = NULL; 6455897Sgblack@eecs.umich.edu inflight++; 6467912Shestness@cs.utexas.edu if (!walker->sendTiming(this, pkt)) { 6475245Sgblack@eecs.umich.edu retrying = true; 6485897Sgblack@eecs.umich.edu read = pkt; 6495897Sgblack@eecs.umich.edu inflight--; 6505245Sgblack@eecs.umich.edu return; 6515245Sgblack@eecs.umich.edu } 6525245Sgblack@eecs.umich.edu } 6535245Sgblack@eecs.umich.edu //Send off as many of the writes as we can. 6545245Sgblack@eecs.umich.edu while (writes.size()) { 6555245Sgblack@eecs.umich.edu PacketPtr write = writes.back(); 6565897Sgblack@eecs.umich.edu writes.pop_back(); 6575897Sgblack@eecs.umich.edu inflight++; 6587912Shestness@cs.utexas.edu if (!walker->sendTiming(this, write)) { 6595245Sgblack@eecs.umich.edu retrying = true; 6605897Sgblack@eecs.umich.edu writes.push_back(write); 6615897Sgblack@eecs.umich.edu inflight--; 6625245Sgblack@eecs.umich.edu return; 6635245Sgblack@eecs.umich.edu } 6645245Sgblack@eecs.umich.edu } 6655245Sgblack@eecs.umich.edu} 6665245Sgblack@eecs.umich.edu 6677912Shestness@cs.utexas.edubool 6687912Shestness@cs.utexas.eduWalker::WalkerState::isRetrying() 6695245Sgblack@eecs.umich.edu{ 6707912Shestness@cs.utexas.edu return retrying; 6717912Shestness@cs.utexas.edu} 6727912Shestness@cs.utexas.edu 6737912Shestness@cs.utexas.edubool 6747912Shestness@cs.utexas.eduWalker::WalkerState::isTiming() 6757912Shestness@cs.utexas.edu{ 6767912Shestness@cs.utexas.edu return timing; 6777912Shestness@cs.utexas.edu} 6787912Shestness@cs.utexas.edu 6797912Shestness@cs.utexas.edubool 6807912Shestness@cs.utexas.eduWalker::WalkerState::wasStarted() 6817912Shestness@cs.utexas.edu{ 6827912Shestness@cs.utexas.edu return started; 6837912Shestness@cs.utexas.edu} 6847912Shestness@cs.utexas.edu 6857912Shestness@cs.utexas.eduvoid 6867912Shestness@cs.utexas.eduWalker::WalkerState::retry() 6877912Shestness@cs.utexas.edu{ 6887912Shestness@cs.utexas.edu retrying = false; 6897912Shestness@cs.utexas.edu sendPackets(); 6905245Sgblack@eecs.umich.edu} 6915245Sgblack@eecs.umich.edu 6925895Sgblack@eecs.umich.eduFault 6937912Shestness@cs.utexas.eduWalker::WalkerState::pageFault(bool present) 6945895Sgblack@eecs.umich.edu{ 6955904Sgblack@eecs.umich.edu DPRINTF(PageTableWalker, "Raising page fault.\n"); 6965895Sgblack@eecs.umich.edu HandyM5Reg m5reg = tc->readMiscRegNoEffect(MISCREG_M5_REG); 6976023Snate@binkert.org if (mode == BaseTLB::Execute && !enableNX) 6986023Snate@binkert.org mode = BaseTLB::Read; 6996023Snate@binkert.org return new PageFault(entry.vaddr, present, mode, m5reg.cpl == 3, false); 7005895Sgblack@eecs.umich.edu} 7015895Sgblack@eecs.umich.edu 7027912Shestness@cs.utexas.edu/* end namespace X86ISA */ } 7035245Sgblack@eecs.umich.edu 7045245Sgblack@eecs.umich.eduX86ISA::Walker * 7055245Sgblack@eecs.umich.eduX86PagetableWalkerParams::create() 7065245Sgblack@eecs.umich.edu{ 7075245Sgblack@eecs.umich.edu return new X86ISA::Walker(this); 7085245Sgblack@eecs.umich.edu} 709