tlb.cc revision 5236
14997Sgblack@eecs.umich.edu/*
24997Sgblack@eecs.umich.edu * Copyright (c) 2007 The Hewlett-Packard Development Company
34997Sgblack@eecs.umich.edu * All rights reserved.
44997Sgblack@eecs.umich.edu *
54997Sgblack@eecs.umich.edu * Redistribution and use of this software in source and binary forms,
64997Sgblack@eecs.umich.edu * with or without modification, are permitted provided that the
74997Sgblack@eecs.umich.edu * following conditions are met:
84997Sgblack@eecs.umich.edu *
94997Sgblack@eecs.umich.edu * The software must be used only for Non-Commercial Use which means any
104997Sgblack@eecs.umich.edu * use which is NOT directed to receiving any direct monetary
114997Sgblack@eecs.umich.edu * compensation for, or commercial advantage from such use.  Illustrative
124997Sgblack@eecs.umich.edu * examples of non-commercial use are academic research, personal study,
134997Sgblack@eecs.umich.edu * teaching, education and corporate research & development.
144997Sgblack@eecs.umich.edu * Illustrative examples of commercial use are distributing products for
154997Sgblack@eecs.umich.edu * commercial advantage and providing services using the software for
164997Sgblack@eecs.umich.edu * commercial advantage.
174997Sgblack@eecs.umich.edu *
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194997Sgblack@eecs.umich.edu * covered by patents for commercial use, please contact:
204997Sgblack@eecs.umich.edu *     Director of Intellectual Property Licensing
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244997Sgblack@eecs.umich.edu *     Palo Alto, California  94304
254997Sgblack@eecs.umich.edu *
264997Sgblack@eecs.umich.edu * Redistributions of source code must retain the above copyright notice,
274997Sgblack@eecs.umich.edu * this list of conditions and the following disclaimer.  Redistributions
284997Sgblack@eecs.umich.edu * in binary form must reproduce the above copyright notice, this list of
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334997Sgblack@eecs.umich.edu * this software without specific prior written permission.  No right of
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364997Sgblack@eecs.umich.edu * Non-Commercial Uses.  Derivatives of the software may be shared with
374997Sgblack@eecs.umich.edu * others provided: (i) the others agree to abide by the list of
384997Sgblack@eecs.umich.edu * conditions herein which includes the Non-Commercial Use restrictions;
394997Sgblack@eecs.umich.edu * and (ii) such Derivatives of the software include the above copyright
404997Sgblack@eecs.umich.edu * notice to acknowledge the contribution from this software where
414997Sgblack@eecs.umich.edu * applicable, this list of conditions and the disclaimer below.
424997Sgblack@eecs.umich.edu *
434997Sgblack@eecs.umich.edu * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
444997Sgblack@eecs.umich.edu * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
454997Sgblack@eecs.umich.edu * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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524997Sgblack@eecs.umich.edu * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
534997Sgblack@eecs.umich.edu * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
544997Sgblack@eecs.umich.edu *
554997Sgblack@eecs.umich.edu * Authors: Gabe Black
564997Sgblack@eecs.umich.edu */
574997Sgblack@eecs.umich.edu
584997Sgblack@eecs.umich.edu#include <cstring>
594997Sgblack@eecs.umich.edu
605086Sgblack@eecs.umich.edu#include "config/full_system.hh"
615086Sgblack@eecs.umich.edu
625124Sgblack@eecs.umich.edu#include "arch/x86/pagetable.hh"
635086Sgblack@eecs.umich.edu#include "arch/x86/tlb.hh"
645149Sgblack@eecs.umich.edu#include "arch/x86/x86_traits.hh"
655086Sgblack@eecs.umich.edu#include "base/bitfield.hh"
665086Sgblack@eecs.umich.edu#include "base/trace.hh"
675086Sgblack@eecs.umich.edu#include "cpu/thread_context.hh"
685086Sgblack@eecs.umich.edu#include "cpu/base.hh"
695086Sgblack@eecs.umich.edu#include "mem/packet_access.hh"
705086Sgblack@eecs.umich.edu#include "mem/request.hh"
715086Sgblack@eecs.umich.edu#include "sim/system.hh"
725086Sgblack@eecs.umich.edu
735086Sgblack@eecs.umich.edunamespace X86ISA {
745086Sgblack@eecs.umich.edu
755236Sgblack@eecs.umich.eduTLB::TLB(const Params *p) : MemObject(p), walker(name(), this), size(p->size)
765124Sgblack@eecs.umich.edu{
775124Sgblack@eecs.umich.edu    tlb = new TlbEntry[size];
785124Sgblack@eecs.umich.edu    std::memset(tlb, 0, sizeof(TlbEntry) * size);
795124Sgblack@eecs.umich.edu
805124Sgblack@eecs.umich.edu    for (int x = 0; x < size; x++)
815124Sgblack@eecs.umich.edu        freeList.push_back(&tlb[x]);
825124Sgblack@eecs.umich.edu}
835124Sgblack@eecs.umich.edu
845236Sgblack@eecs.umich.edubool
855236Sgblack@eecs.umich.eduTLB::Walker::doNext(uint64_t data, PacketPtr &write)
865236Sgblack@eecs.umich.edu{
875236Sgblack@eecs.umich.edu    assert(state != Ready && state != Waiting);
885236Sgblack@eecs.umich.edu    write = NULL;
895236Sgblack@eecs.umich.edu    switch(state) {
905236Sgblack@eecs.umich.edu      case LongPML4:
915236Sgblack@eecs.umich.edu        nextState = LongPDP;
925236Sgblack@eecs.umich.edu        break;
935236Sgblack@eecs.umich.edu      case LongPDP:
945236Sgblack@eecs.umich.edu        nextState = LongPD;
955236Sgblack@eecs.umich.edu        break;
965236Sgblack@eecs.umich.edu      case LongPD:
975236Sgblack@eecs.umich.edu        nextState = LongPTE;
985236Sgblack@eecs.umich.edu        break;
995236Sgblack@eecs.umich.edu      case LongPTE:
1005236Sgblack@eecs.umich.edu        nextState = Ready;
1015236Sgblack@eecs.umich.edu        return false;
1025236Sgblack@eecs.umich.edu      case PAEPDP:
1035236Sgblack@eecs.umich.edu        nextState = PAEPD;
1045236Sgblack@eecs.umich.edu        break;
1055236Sgblack@eecs.umich.edu      case PAEPD:
1065236Sgblack@eecs.umich.edu        break;
1075236Sgblack@eecs.umich.edu      case PAEPTE:
1085236Sgblack@eecs.umich.edu        nextState = Ready;
1095236Sgblack@eecs.umich.edu        return false;
1105236Sgblack@eecs.umich.edu      case PSEPD:
1115236Sgblack@eecs.umich.edu        break;
1125236Sgblack@eecs.umich.edu      case PD:
1135236Sgblack@eecs.umich.edu        nextState = PTE;
1145236Sgblack@eecs.umich.edu        break;
1155236Sgblack@eecs.umich.edu      case PTE:
1165236Sgblack@eecs.umich.edu        nextState = Ready;
1175236Sgblack@eecs.umich.edu        return false;
1185236Sgblack@eecs.umich.edu      default:
1195236Sgblack@eecs.umich.edu        panic("Unknown page table walker state %d!\n");
1205236Sgblack@eecs.umich.edu    }
1215236Sgblack@eecs.umich.edu    return true;
1225236Sgblack@eecs.umich.edu}
1235236Sgblack@eecs.umich.edu
1245236Sgblack@eecs.umich.eduvoid
1255236Sgblack@eecs.umich.eduTLB::Walker::buildReadPacket(Addr addr)
1265236Sgblack@eecs.umich.edu{
1275236Sgblack@eecs.umich.edu    readRequest.setPhys(addr, size, PHYSICAL | uncachable ? UNCACHEABLE : 0);
1285236Sgblack@eecs.umich.edu    readPacket.reinitFromRequest();
1295236Sgblack@eecs.umich.edu}
1305236Sgblack@eecs.umich.edu
1315236Sgblack@eecs.umich.eduTLB::walker::buildWritePacket(Addr addr)
1325236Sgblack@eecs.umich.edu{
1335236Sgblack@eecs.umich.edu    writeRequest.setPhys(addr, size, PHYSICAL | uncachable ? UNCACHEABLE : 0);
1345236Sgblack@eecs.umich.edu    writePacket.reinitFromRequest();
1355236Sgblack@eecs.umich.edu
1365236Sgblack@eecs.umich.edubool
1375236Sgblack@eecs.umich.eduTLB::Walker::WalkerPort::recvTiming(PacketPtr pkt)
1385236Sgblack@eecs.umich.edu{
1395236Sgblack@eecs.umich.edu    if (pkt->isResponse() && !pkt->wasNacked()) {
1405236Sgblack@eecs.umich.edu        if (pkt->isRead()) {
1415236Sgblack@eecs.umich.edu            assert(packet);
1425236Sgblack@eecs.umich.edu            assert(walker->state == Waiting);
1435236Sgblack@eecs.umich.edu            packet = NULL;
1445236Sgblack@eecs.umich.edu            walker->state = walker->nextState;
1455236Sgblack@eecs.umich.edu            walker->nextState = Ready;
1465236Sgblack@eecs.umich.edu            PacketPtr write;
1475236Sgblack@eecs.umich.edu            if (walker->doNext(pkt, write)) {
1485236Sgblack@eecs.umich.edu                packet = &walker->packet;
1495236Sgblack@eecs.umich.edu                port->sendTiming(packet);
1505236Sgblack@eecs.umich.edu            }
1515236Sgblack@eecs.umich.edu            if (write) {
1525236Sgblack@eecs.umich.edu                writes.push_back(write);
1535236Sgblack@eecs.umich.edu            }
1545236Sgblack@eecs.umich.edu            while (!port->blocked() && writes.size()) {
1555236Sgblack@eecs.umich.edu                if (port->sendTiming(writes.front())) {
1565236Sgblack@eecs.umich.edu                    writes.pop_front();
1575236Sgblack@eecs.umich.edu                    outstandingWrites++;
1585236Sgblack@eecs.umich.edu                }
1595236Sgblack@eecs.umich.edu            }
1605236Sgblack@eecs.umich.edu        } else {
1615236Sgblack@eecs.umich.edu            outstandingWrites--;
1625236Sgblack@eecs.umich.edu        }
1635236Sgblack@eecs.umich.edu    } else if (pkt->wasNacked()) {
1645236Sgblack@eecs.umich.edu        pkt->reinitNacked();
1655236Sgblack@eecs.umich.edu        if (!sendTiming(pkt)) {
1665236Sgblack@eecs.umich.edu            if (pkt->isWrite()) {
1675236Sgblack@eecs.umich.edu                writes.push_front(pkt);
1685236Sgblack@eecs.umich.edu            }
1695236Sgblack@eecs.umich.edu        }
1705236Sgblack@eecs.umich.edu    }
1715236Sgblack@eecs.umich.edu    return true;
1725236Sgblack@eecs.umich.edu}
1735236Sgblack@eecs.umich.edu
1745236Sgblack@eecs.umich.eduTick
1755236Sgblack@eecs.umich.eduTLB::Walker::WalkerPort::recvAtomic(PacketPtr pkt)
1765236Sgblack@eecs.umich.edu{
1775236Sgblack@eecs.umich.edu    return 0;
1785236Sgblack@eecs.umich.edu}
1795236Sgblack@eecs.umich.edu
1805236Sgblack@eecs.umich.eduvoid
1815236Sgblack@eecs.umich.eduTLB::Walker::WalkerPort::recvFunctional(PacketPtr pkt)
1825236Sgblack@eecs.umich.edu{
1835236Sgblack@eecs.umich.edu    return;
1845236Sgblack@eecs.umich.edu}
1855236Sgblack@eecs.umich.edu
1865236Sgblack@eecs.umich.eduvoid
1875236Sgblack@eecs.umich.eduTLB::Walker::WalkerPort::recvStatusChange(Status status)
1885236Sgblack@eecs.umich.edu{
1895236Sgblack@eecs.umich.edu    if (status == RangeChange) {
1905236Sgblack@eecs.umich.edu        if (!snoopRangeSent) {
1915236Sgblack@eecs.umich.edu            snoopRangeSent = true;
1925236Sgblack@eecs.umich.edu            sendStatusChange(Port::RangeChange);
1935236Sgblack@eecs.umich.edu        }
1945236Sgblack@eecs.umich.edu        return;
1955236Sgblack@eecs.umich.edu    }
1965236Sgblack@eecs.umich.edu
1975236Sgblack@eecs.umich.edu    panic("Unexpected recvStatusChange.\n");
1985236Sgblack@eecs.umich.edu}
1995236Sgblack@eecs.umich.edu
2005236Sgblack@eecs.umich.eduvoid
2015236Sgblack@eecs.umich.eduTLB::Walker::WalkerPort::recvRetry()
2025236Sgblack@eecs.umich.edu{
2035236Sgblack@eecs.umich.edu    retrying = false;
2045236Sgblack@eecs.umich.edu    if (!sendTiming(packet)) {
2055236Sgblack@eecs.umich.edu        retrying = true;
2065236Sgblack@eecs.umich.edu    }
2075236Sgblack@eecs.umich.edu}
2085236Sgblack@eecs.umich.edu
2095236Sgblack@eecs.umich.eduPort *
2105236Sgblack@eecs.umich.eduTLB::getPort(const std::string &if_name, int idx)
2115236Sgblack@eecs.umich.edu{
2125236Sgblack@eecs.umich.edu    if (if_name == "walker_port")
2135236Sgblack@eecs.umich.edu        return &walker.port;
2145236Sgblack@eecs.umich.edu    else
2155236Sgblack@eecs.umich.edu        panic("No tlb port named %s!\n", if_name);
2165236Sgblack@eecs.umich.edu}
2175236Sgblack@eecs.umich.edu
2185124Sgblack@eecs.umich.eduvoid
2195124Sgblack@eecs.umich.eduTLB::insert(Addr vpn, TlbEntry &entry)
2205124Sgblack@eecs.umich.edu{
2215124Sgblack@eecs.umich.edu    //TODO Deal with conflicting entries
2225124Sgblack@eecs.umich.edu
2235124Sgblack@eecs.umich.edu    TlbEntry *newEntry = NULL;
2245124Sgblack@eecs.umich.edu    if (!freeList.empty()) {
2255124Sgblack@eecs.umich.edu        newEntry = freeList.front();
2265124Sgblack@eecs.umich.edu        freeList.pop_front();
2275124Sgblack@eecs.umich.edu    } else {
2285124Sgblack@eecs.umich.edu        newEntry = entryList.back();
2295124Sgblack@eecs.umich.edu        entryList.pop_back();
2305124Sgblack@eecs.umich.edu    }
2315124Sgblack@eecs.umich.edu    *newEntry = entry;
2325124Sgblack@eecs.umich.edu    newEntry->vaddr = vpn;
2335124Sgblack@eecs.umich.edu    entryList.push_front(newEntry);
2345124Sgblack@eecs.umich.edu}
2355124Sgblack@eecs.umich.edu
2365124Sgblack@eecs.umich.eduTlbEntry *
2375124Sgblack@eecs.umich.eduTLB::lookup(Addr va, bool update_lru)
2385124Sgblack@eecs.umich.edu{
2395124Sgblack@eecs.umich.edu    //TODO make this smarter at some point
2405124Sgblack@eecs.umich.edu    EntryList::iterator entry;
2415124Sgblack@eecs.umich.edu    for (entry = entryList.begin(); entry != entryList.end(); entry++) {
2425124Sgblack@eecs.umich.edu        if ((*entry)->vaddr <= va && (*entry)->vaddr + (*entry)->size > va) {
2435124Sgblack@eecs.umich.edu            DPRINTF(TLB, "Matched vaddr %#x to entry starting at %#x "
2445124Sgblack@eecs.umich.edu                    "with size %#x.\n", va, (*entry)->vaddr, (*entry)->size);
2455124Sgblack@eecs.umich.edu            TlbEntry *e = *entry;
2465124Sgblack@eecs.umich.edu            if (update_lru) {
2475124Sgblack@eecs.umich.edu                entryList.erase(entry);
2485124Sgblack@eecs.umich.edu                entryList.push_front(e);
2495124Sgblack@eecs.umich.edu            }
2505124Sgblack@eecs.umich.edu            return e;
2515124Sgblack@eecs.umich.edu        }
2525124Sgblack@eecs.umich.edu    }
2535124Sgblack@eecs.umich.edu    return NULL;
2545124Sgblack@eecs.umich.edu}
2555124Sgblack@eecs.umich.edu
2565124Sgblack@eecs.umich.eduvoid
2575124Sgblack@eecs.umich.eduTLB::invalidateAll()
2585124Sgblack@eecs.umich.edu{
2595124Sgblack@eecs.umich.edu}
2605124Sgblack@eecs.umich.edu
2615124Sgblack@eecs.umich.eduvoid
2625124Sgblack@eecs.umich.eduTLB::invalidateNonGlobal()
2635124Sgblack@eecs.umich.edu{
2645124Sgblack@eecs.umich.edu}
2655124Sgblack@eecs.umich.edu
2665124Sgblack@eecs.umich.eduvoid
2675124Sgblack@eecs.umich.eduTLB::demapPage(Addr va)
2685086Sgblack@eecs.umich.edu{
2695086Sgblack@eecs.umich.edu}
2705086Sgblack@eecs.umich.edu
2715140Sgblack@eecs.umich.edutemplate<class TlbFault>
2725086Sgblack@eecs.umich.eduFault
2735140Sgblack@eecs.umich.eduTLB::translate(RequestPtr &req, ThreadContext *tc, bool write, bool execute)
2745086Sgblack@eecs.umich.edu{
2755124Sgblack@eecs.umich.edu    Addr vaddr = req->getVaddr();
2765140Sgblack@eecs.umich.edu    DPRINTF(TLB, "Translating vaddr %#x.\n", vaddr);
2775124Sgblack@eecs.umich.edu    uint32_t flags = req->getFlags();
2785124Sgblack@eecs.umich.edu    bool storeCheck = flags & StoreCheck;
2795140Sgblack@eecs.umich.edu
2805149Sgblack@eecs.umich.edu    int seg = flags & mask(3);
2815124Sgblack@eecs.umich.edu
2825124Sgblack@eecs.umich.edu    //XXX Junk code to surpress the warning
2835149Sgblack@eecs.umich.edu    if (storeCheck);
2845149Sgblack@eecs.umich.edu
2855149Sgblack@eecs.umich.edu    // If this is true, we're dealing with a request to read an internal
2865149Sgblack@eecs.umich.edu    // value.
2875232Sgblack@eecs.umich.edu    if (seg == SEGMENT_REG_INT) {
2885149Sgblack@eecs.umich.edu        Addr prefix = vaddr & IntAddrPrefixMask;
2895149Sgblack@eecs.umich.edu        if (prefix == IntAddrPrefixCPUID) {
2905149Sgblack@eecs.umich.edu            panic("CPUID memory space not yet implemented!\n");
2915149Sgblack@eecs.umich.edu        } else if (prefix == IntAddrPrefixMSR) {
2925149Sgblack@eecs.umich.edu            req->setMmapedIpr(true);
2935149Sgblack@eecs.umich.edu            Addr regNum = 0;
2945149Sgblack@eecs.umich.edu            switch (vaddr & ~IntAddrPrefixMask) {
2955149Sgblack@eecs.umich.edu              case 0x10:
2965149Sgblack@eecs.umich.edu                regNum = MISCREG_TSC;
2975149Sgblack@eecs.umich.edu                break;
2985149Sgblack@eecs.umich.edu              case 0xFE:
2995149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRRCAP;
3005149Sgblack@eecs.umich.edu                break;
3015149Sgblack@eecs.umich.edu              case 0x174:
3025149Sgblack@eecs.umich.edu                regNum = MISCREG_SYSENTER_CS;
3035149Sgblack@eecs.umich.edu                break;
3045149Sgblack@eecs.umich.edu              case 0x175:
3055149Sgblack@eecs.umich.edu                regNum = MISCREG_SYSENTER_ESP;
3065149Sgblack@eecs.umich.edu                break;
3075149Sgblack@eecs.umich.edu              case 0x176:
3085149Sgblack@eecs.umich.edu                regNum = MISCREG_SYSENTER_EIP;
3095149Sgblack@eecs.umich.edu                break;
3105149Sgblack@eecs.umich.edu              case 0x179:
3115149Sgblack@eecs.umich.edu                regNum = MISCREG_MCG_CAP;
3125149Sgblack@eecs.umich.edu                break;
3135149Sgblack@eecs.umich.edu              case 0x17A:
3145149Sgblack@eecs.umich.edu                regNum = MISCREG_MCG_STATUS;
3155149Sgblack@eecs.umich.edu                break;
3165149Sgblack@eecs.umich.edu              case 0x17B:
3175149Sgblack@eecs.umich.edu                regNum = MISCREG_MCG_CTL;
3185149Sgblack@eecs.umich.edu                break;
3195149Sgblack@eecs.umich.edu              case 0x1D9:
3205149Sgblack@eecs.umich.edu                regNum = MISCREG_DEBUG_CTL_MSR;
3215149Sgblack@eecs.umich.edu                break;
3225149Sgblack@eecs.umich.edu              case 0x1DB:
3235149Sgblack@eecs.umich.edu                regNum = MISCREG_LAST_BRANCH_FROM_IP;
3245149Sgblack@eecs.umich.edu                break;
3255149Sgblack@eecs.umich.edu              case 0x1DC:
3265149Sgblack@eecs.umich.edu                regNum = MISCREG_LAST_BRANCH_TO_IP;
3275149Sgblack@eecs.umich.edu                break;
3285149Sgblack@eecs.umich.edu              case 0x1DD:
3295149Sgblack@eecs.umich.edu                regNum = MISCREG_LAST_EXCEPTION_FROM_IP;
3305149Sgblack@eecs.umich.edu                break;
3315149Sgblack@eecs.umich.edu              case 0x1DE:
3325149Sgblack@eecs.umich.edu                regNum = MISCREG_LAST_EXCEPTION_TO_IP;
3335149Sgblack@eecs.umich.edu                break;
3345149Sgblack@eecs.umich.edu              case 0x200:
3355149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_PHYS_BASE_0;
3365149Sgblack@eecs.umich.edu                break;
3375149Sgblack@eecs.umich.edu              case 0x201:
3385149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_PHYS_MASK_0;
3395149Sgblack@eecs.umich.edu                break;
3405149Sgblack@eecs.umich.edu              case 0x202:
3415149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_PHYS_BASE_1;
3425149Sgblack@eecs.umich.edu                break;
3435149Sgblack@eecs.umich.edu              case 0x203:
3445149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_PHYS_MASK_1;
3455149Sgblack@eecs.umich.edu                break;
3465149Sgblack@eecs.umich.edu              case 0x204:
3475149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_PHYS_BASE_2;
3485149Sgblack@eecs.umich.edu                break;
3495149Sgblack@eecs.umich.edu              case 0x205:
3505149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_PHYS_MASK_2;
3515149Sgblack@eecs.umich.edu                break;
3525149Sgblack@eecs.umich.edu              case 0x206:
3535149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_PHYS_BASE_3;
3545149Sgblack@eecs.umich.edu                break;
3555149Sgblack@eecs.umich.edu              case 0x207:
3565149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_PHYS_MASK_3;
3575149Sgblack@eecs.umich.edu                break;
3585149Sgblack@eecs.umich.edu              case 0x208:
3595149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_PHYS_BASE_4;
3605149Sgblack@eecs.umich.edu                break;
3615149Sgblack@eecs.umich.edu              case 0x209:
3625149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_PHYS_MASK_4;
3635149Sgblack@eecs.umich.edu                break;
3645149Sgblack@eecs.umich.edu              case 0x20A:
3655149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_PHYS_BASE_5;
3665149Sgblack@eecs.umich.edu                break;
3675149Sgblack@eecs.umich.edu              case 0x20B:
3685149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_PHYS_MASK_5;
3695149Sgblack@eecs.umich.edu                break;
3705149Sgblack@eecs.umich.edu              case 0x20C:
3715149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_PHYS_BASE_6;
3725149Sgblack@eecs.umich.edu                break;
3735149Sgblack@eecs.umich.edu              case 0x20D:
3745149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_PHYS_MASK_6;
3755149Sgblack@eecs.umich.edu                break;
3765149Sgblack@eecs.umich.edu              case 0x20E:
3775149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_PHYS_BASE_7;
3785149Sgblack@eecs.umich.edu                break;
3795149Sgblack@eecs.umich.edu              case 0x20F:
3805149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_PHYS_MASK_7;
3815149Sgblack@eecs.umich.edu                break;
3825149Sgblack@eecs.umich.edu              case 0x250:
3835149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_FIX_64K_00000;
3845149Sgblack@eecs.umich.edu                break;
3855149Sgblack@eecs.umich.edu              case 0x258:
3865149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_FIX_16K_80000;
3875149Sgblack@eecs.umich.edu                break;
3885149Sgblack@eecs.umich.edu              case 0x259:
3895149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_FIX_16K_A0000;
3905149Sgblack@eecs.umich.edu                break;
3915149Sgblack@eecs.umich.edu              case 0x268:
3925149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_FIX_4K_C0000;
3935149Sgblack@eecs.umich.edu                break;
3945149Sgblack@eecs.umich.edu              case 0x269:
3955149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_FIX_4K_C8000;
3965149Sgblack@eecs.umich.edu                break;
3975149Sgblack@eecs.umich.edu              case 0x26A:
3985149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_FIX_4K_D0000;
3995149Sgblack@eecs.umich.edu                break;
4005149Sgblack@eecs.umich.edu              case 0x26B:
4015149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_FIX_4K_D8000;
4025149Sgblack@eecs.umich.edu                break;
4035149Sgblack@eecs.umich.edu              case 0x26C:
4045149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_FIX_4K_E0000;
4055149Sgblack@eecs.umich.edu                break;
4065149Sgblack@eecs.umich.edu              case 0x26D:
4075149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_FIX_4K_E8000;
4085149Sgblack@eecs.umich.edu                break;
4095149Sgblack@eecs.umich.edu              case 0x26E:
4105149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_FIX_4K_F0000;
4115149Sgblack@eecs.umich.edu                break;
4125149Sgblack@eecs.umich.edu              case 0x26F:
4135149Sgblack@eecs.umich.edu                regNum = MISCREG_MTRR_FIX_4K_F8000;
4145149Sgblack@eecs.umich.edu                break;
4155149Sgblack@eecs.umich.edu              case 0x277:
4165149Sgblack@eecs.umich.edu                regNum = MISCREG_PAT;
4175149Sgblack@eecs.umich.edu                break;
4185149Sgblack@eecs.umich.edu              case 0x2FF:
4195149Sgblack@eecs.umich.edu                regNum = MISCREG_DEF_TYPE;
4205149Sgblack@eecs.umich.edu                break;
4215149Sgblack@eecs.umich.edu              case 0x400:
4225149Sgblack@eecs.umich.edu                regNum = MISCREG_MC0_CTL;
4235149Sgblack@eecs.umich.edu                break;
4245149Sgblack@eecs.umich.edu              case 0x404:
4255149Sgblack@eecs.umich.edu                regNum = MISCREG_MC1_CTL;
4265149Sgblack@eecs.umich.edu                break;
4275149Sgblack@eecs.umich.edu              case 0x408:
4285149Sgblack@eecs.umich.edu                regNum = MISCREG_MC2_CTL;
4295149Sgblack@eecs.umich.edu                break;
4305149Sgblack@eecs.umich.edu              case 0x40C:
4315149Sgblack@eecs.umich.edu                regNum = MISCREG_MC3_CTL;
4325149Sgblack@eecs.umich.edu                break;
4335149Sgblack@eecs.umich.edu              case 0x410:
4345149Sgblack@eecs.umich.edu                regNum = MISCREG_MC4_CTL;
4355149Sgblack@eecs.umich.edu                break;
4365149Sgblack@eecs.umich.edu              case 0x401:
4375149Sgblack@eecs.umich.edu                regNum = MISCREG_MC0_STATUS;
4385149Sgblack@eecs.umich.edu                break;
4395149Sgblack@eecs.umich.edu              case 0x405:
4405149Sgblack@eecs.umich.edu                regNum = MISCREG_MC1_STATUS;
4415149Sgblack@eecs.umich.edu                break;
4425149Sgblack@eecs.umich.edu              case 0x409:
4435149Sgblack@eecs.umich.edu                regNum = MISCREG_MC2_STATUS;
4445149Sgblack@eecs.umich.edu                break;
4455149Sgblack@eecs.umich.edu              case 0x40D:
4465149Sgblack@eecs.umich.edu                regNum = MISCREG_MC3_STATUS;
4475149Sgblack@eecs.umich.edu                break;
4485149Sgblack@eecs.umich.edu              case 0x411:
4495149Sgblack@eecs.umich.edu                regNum = MISCREG_MC4_STATUS;
4505149Sgblack@eecs.umich.edu                break;
4515149Sgblack@eecs.umich.edu              case 0x402:
4525149Sgblack@eecs.umich.edu                regNum = MISCREG_MC0_ADDR;
4535149Sgblack@eecs.umich.edu                break;
4545149Sgblack@eecs.umich.edu              case 0x406:
4555149Sgblack@eecs.umich.edu                regNum = MISCREG_MC1_ADDR;
4565149Sgblack@eecs.umich.edu                break;
4575149Sgblack@eecs.umich.edu              case 0x40A:
4585149Sgblack@eecs.umich.edu                regNum = MISCREG_MC2_ADDR;
4595149Sgblack@eecs.umich.edu                break;
4605149Sgblack@eecs.umich.edu              case 0x40E:
4615149Sgblack@eecs.umich.edu                regNum = MISCREG_MC3_ADDR;
4625149Sgblack@eecs.umich.edu                break;
4635149Sgblack@eecs.umich.edu              case 0x412:
4645149Sgblack@eecs.umich.edu                regNum = MISCREG_MC4_ADDR;
4655149Sgblack@eecs.umich.edu                break;
4665149Sgblack@eecs.umich.edu              case 0x403:
4675149Sgblack@eecs.umich.edu                regNum = MISCREG_MC0_MISC;
4685149Sgblack@eecs.umich.edu                break;
4695149Sgblack@eecs.umich.edu              case 0x407:
4705149Sgblack@eecs.umich.edu                regNum = MISCREG_MC1_MISC;
4715149Sgblack@eecs.umich.edu                break;
4725149Sgblack@eecs.umich.edu              case 0x40B:
4735149Sgblack@eecs.umich.edu                regNum = MISCREG_MC2_MISC;
4745149Sgblack@eecs.umich.edu                break;
4755149Sgblack@eecs.umich.edu              case 0x40F:
4765149Sgblack@eecs.umich.edu                regNum = MISCREG_MC3_MISC;
4775149Sgblack@eecs.umich.edu                break;
4785149Sgblack@eecs.umich.edu              case 0x413:
4795149Sgblack@eecs.umich.edu                regNum = MISCREG_MC4_MISC;
4805149Sgblack@eecs.umich.edu                break;
4815149Sgblack@eecs.umich.edu              case 0xC0000080:
4825149Sgblack@eecs.umich.edu                regNum = MISCREG_EFER;
4835149Sgblack@eecs.umich.edu                break;
4845149Sgblack@eecs.umich.edu              case 0xC0000081:
4855149Sgblack@eecs.umich.edu                regNum = MISCREG_STAR;
4865149Sgblack@eecs.umich.edu                break;
4875149Sgblack@eecs.umich.edu              case 0xC0000082:
4885149Sgblack@eecs.umich.edu                regNum = MISCREG_LSTAR;
4895149Sgblack@eecs.umich.edu                break;
4905149Sgblack@eecs.umich.edu              case 0xC0000083:
4915149Sgblack@eecs.umich.edu                regNum = MISCREG_CSTAR;
4925149Sgblack@eecs.umich.edu                break;
4935149Sgblack@eecs.umich.edu              case 0xC0000084:
4945149Sgblack@eecs.umich.edu                regNum = MISCREG_SF_MASK;
4955149Sgblack@eecs.umich.edu                break;
4965149Sgblack@eecs.umich.edu              case 0xC0000100:
4975149Sgblack@eecs.umich.edu                regNum = MISCREG_FS_BASE;
4985149Sgblack@eecs.umich.edu                break;
4995149Sgblack@eecs.umich.edu              case 0xC0000101:
5005149Sgblack@eecs.umich.edu                regNum = MISCREG_GS_BASE;
5015149Sgblack@eecs.umich.edu                break;
5025149Sgblack@eecs.umich.edu              case 0xC0000102:
5035149Sgblack@eecs.umich.edu                regNum = MISCREG_KERNEL_GS_BASE;
5045149Sgblack@eecs.umich.edu                break;
5055149Sgblack@eecs.umich.edu              case 0xC0000103:
5065149Sgblack@eecs.umich.edu                regNum = MISCREG_TSC_AUX;
5075149Sgblack@eecs.umich.edu                break;
5085149Sgblack@eecs.umich.edu              case 0xC0010000:
5095149Sgblack@eecs.umich.edu                regNum = MISCREG_PERF_EVT_SEL0;
5105149Sgblack@eecs.umich.edu                break;
5115149Sgblack@eecs.umich.edu              case 0xC0010001:
5125149Sgblack@eecs.umich.edu                regNum = MISCREG_PERF_EVT_SEL1;
5135149Sgblack@eecs.umich.edu                break;
5145149Sgblack@eecs.umich.edu              case 0xC0010002:
5155149Sgblack@eecs.umich.edu                regNum = MISCREG_PERF_EVT_SEL2;
5165149Sgblack@eecs.umich.edu                break;
5175149Sgblack@eecs.umich.edu              case 0xC0010003:
5185149Sgblack@eecs.umich.edu                regNum = MISCREG_PERF_EVT_SEL3;
5195149Sgblack@eecs.umich.edu                break;
5205149Sgblack@eecs.umich.edu              case 0xC0010004:
5215149Sgblack@eecs.umich.edu                regNum = MISCREG_PERF_EVT_CTR0;
5225149Sgblack@eecs.umich.edu                break;
5235149Sgblack@eecs.umich.edu              case 0xC0010005:
5245149Sgblack@eecs.umich.edu                regNum = MISCREG_PERF_EVT_CTR1;
5255149Sgblack@eecs.umich.edu                break;
5265149Sgblack@eecs.umich.edu              case 0xC0010006:
5275149Sgblack@eecs.umich.edu                regNum = MISCREG_PERF_EVT_CTR2;
5285149Sgblack@eecs.umich.edu                break;
5295149Sgblack@eecs.umich.edu              case 0xC0010007:
5305149Sgblack@eecs.umich.edu                regNum = MISCREG_PERF_EVT_CTR3;
5315149Sgblack@eecs.umich.edu                break;
5325149Sgblack@eecs.umich.edu              case 0xC0010010:
5335149Sgblack@eecs.umich.edu                regNum = MISCREG_SYSCFG;
5345149Sgblack@eecs.umich.edu                break;
5355149Sgblack@eecs.umich.edu              case 0xC0010016:
5365149Sgblack@eecs.umich.edu                regNum = MISCREG_IORR_BASE0;
5375149Sgblack@eecs.umich.edu                break;
5385149Sgblack@eecs.umich.edu              case 0xC0010017:
5395149Sgblack@eecs.umich.edu                regNum = MISCREG_IORR_BASE1;
5405149Sgblack@eecs.umich.edu                break;
5415149Sgblack@eecs.umich.edu              case 0xC0010018:
5425149Sgblack@eecs.umich.edu                regNum = MISCREG_IORR_MASK0;
5435149Sgblack@eecs.umich.edu                break;
5445149Sgblack@eecs.umich.edu              case 0xC0010019:
5455149Sgblack@eecs.umich.edu                regNum = MISCREG_IORR_MASK1;
5465149Sgblack@eecs.umich.edu                break;
5475149Sgblack@eecs.umich.edu              case 0xC001001A:
5485149Sgblack@eecs.umich.edu                regNum = MISCREG_TOP_MEM;
5495149Sgblack@eecs.umich.edu                break;
5505149Sgblack@eecs.umich.edu              case 0xC001001D:
5515149Sgblack@eecs.umich.edu                regNum = MISCREG_TOP_MEM2;
5525149Sgblack@eecs.umich.edu                break;
5535149Sgblack@eecs.umich.edu              case 0xC0010114:
5545149Sgblack@eecs.umich.edu                regNum = MISCREG_VM_CR;
5555149Sgblack@eecs.umich.edu                break;
5565149Sgblack@eecs.umich.edu              case 0xC0010115:
5575149Sgblack@eecs.umich.edu                regNum = MISCREG_IGNNE;
5585149Sgblack@eecs.umich.edu                break;
5595149Sgblack@eecs.umich.edu              case 0xC0010116:
5605149Sgblack@eecs.umich.edu                regNum = MISCREG_SMM_CTL;
5615149Sgblack@eecs.umich.edu                break;
5625149Sgblack@eecs.umich.edu              case 0xC0010117:
5635149Sgblack@eecs.umich.edu                regNum = MISCREG_VM_HSAVE_PA;
5645149Sgblack@eecs.umich.edu                break;
5655149Sgblack@eecs.umich.edu              default:
5665149Sgblack@eecs.umich.edu                return new GeneralProtection(0);
5675149Sgblack@eecs.umich.edu            }
5685149Sgblack@eecs.umich.edu            //The index is multiplied by the size of a MiscReg so that
5695149Sgblack@eecs.umich.edu            //any memory dependence calculations will not see these as
5705149Sgblack@eecs.umich.edu            //overlapping.
5715149Sgblack@eecs.umich.edu            req->setPaddr(regNum * sizeof(MiscReg));
5725149Sgblack@eecs.umich.edu            return NoFault;
5735149Sgblack@eecs.umich.edu        } else {
5745149Sgblack@eecs.umich.edu            panic("Access to unrecognized internal address space %#x.\n",
5755149Sgblack@eecs.umich.edu                    prefix);
5765149Sgblack@eecs.umich.edu        }
5775149Sgblack@eecs.umich.edu    }
5785124Sgblack@eecs.umich.edu
5795140Sgblack@eecs.umich.edu    // Get cr0. This will tell us how to do translation. We'll assume it was
5805140Sgblack@eecs.umich.edu    // verified to be correct and consistent when set.
5815140Sgblack@eecs.umich.edu    CR0 cr0 = tc->readMiscRegNoEffect(MISCREG_CR0);
5825140Sgblack@eecs.umich.edu
5835140Sgblack@eecs.umich.edu    // If protected mode has been enabled...
5845140Sgblack@eecs.umich.edu    if (cr0.pe) {
5855140Sgblack@eecs.umich.edu        Efer efer = tc->readMiscRegNoEffect(MISCREG_EFER);
5865140Sgblack@eecs.umich.edu        SegAttr csAttr = tc->readMiscRegNoEffect(MISCREG_CS_ATTR);
5875140Sgblack@eecs.umich.edu        // If we're not in 64-bit mode, do protection/limit checks
5885140Sgblack@eecs.umich.edu        if (!efer.lma || !csAttr.longMode) {
5895140Sgblack@eecs.umich.edu            SegAttr attr = tc->readMiscRegNoEffect(MISCREG_SEG_ATTR(seg));
5905140Sgblack@eecs.umich.edu            if (!attr.writable && write)
5915140Sgblack@eecs.umich.edu                return new GeneralProtection(0);
5925140Sgblack@eecs.umich.edu            if (!attr.readable && !write && !execute)
5935140Sgblack@eecs.umich.edu                return new GeneralProtection(0);
5945140Sgblack@eecs.umich.edu            Addr base = tc->readMiscRegNoEffect(MISCREG_SEG_BASE(seg));
5955140Sgblack@eecs.umich.edu            Addr limit = tc->readMiscRegNoEffect(MISCREG_SEG_LIMIT(seg));
5965140Sgblack@eecs.umich.edu            if (!attr.expandDown) {
5975140Sgblack@eecs.umich.edu                // We don't have to worry about the access going around the
5985140Sgblack@eecs.umich.edu                // end of memory because accesses will be broken up into
5995140Sgblack@eecs.umich.edu                // pieces at boundaries aligned on sizes smaller than an
6005140Sgblack@eecs.umich.edu                // entire address space. We do have to worry about the limit
6015140Sgblack@eecs.umich.edu                // being less than the base.
6025140Sgblack@eecs.umich.edu                if (limit < base) {
6035140Sgblack@eecs.umich.edu                    if (limit < vaddr + req->getSize() && vaddr < base)
6045140Sgblack@eecs.umich.edu                        return new GeneralProtection(0);
6055140Sgblack@eecs.umich.edu                } else {
6065140Sgblack@eecs.umich.edu                    if (limit < vaddr + req->getSize())
6075140Sgblack@eecs.umich.edu                        return new GeneralProtection(0);
6085140Sgblack@eecs.umich.edu                }
6095140Sgblack@eecs.umich.edu            } else {
6105140Sgblack@eecs.umich.edu                if (limit < base) {
6115140Sgblack@eecs.umich.edu                    if (vaddr <= limit || vaddr + req->getSize() >= base)
6125140Sgblack@eecs.umich.edu                        return new GeneralProtection(0);
6135140Sgblack@eecs.umich.edu                } else {
6145140Sgblack@eecs.umich.edu                    if (vaddr <= limit && vaddr + req->getSize() >= base)
6155140Sgblack@eecs.umich.edu                        return new GeneralProtection(0);
6165140Sgblack@eecs.umich.edu                }
6175140Sgblack@eecs.umich.edu            }
6185140Sgblack@eecs.umich.edu        }
6195140Sgblack@eecs.umich.edu        // If paging is enabled, do the translation.
6205140Sgblack@eecs.umich.edu        if (cr0.pg) {
6215140Sgblack@eecs.umich.edu            // The vaddr already has the segment base applied.
6225140Sgblack@eecs.umich.edu            TlbEntry *entry = lookup(vaddr);
6235140Sgblack@eecs.umich.edu            if (!entry) {
6245124Sgblack@eecs.umich.edu#if FULL_SYSTEM
6255140Sgblack@eecs.umich.edu                return new TlbFault();
6265124Sgblack@eecs.umich.edu#else
6275140Sgblack@eecs.umich.edu                return new TlbFault(vaddr);
6285124Sgblack@eecs.umich.edu#endif
6295140Sgblack@eecs.umich.edu            } else {
6305140Sgblack@eecs.umich.edu                // Do paging protection checks.
6315184Sgblack@eecs.umich.edu                Addr paddr = entry->paddr | (vaddr & mask(12));
6325140Sgblack@eecs.umich.edu                req->setPaddr(paddr);
6335140Sgblack@eecs.umich.edu            }
6345140Sgblack@eecs.umich.edu        } else {
6355140Sgblack@eecs.umich.edu            //Use the address which already has segmentation applied.
6365140Sgblack@eecs.umich.edu            req->setPaddr(vaddr);
6375140Sgblack@eecs.umich.edu        }
6385124Sgblack@eecs.umich.edu    } else {
6395140Sgblack@eecs.umich.edu        // Real mode
6405140Sgblack@eecs.umich.edu        req->setPaddr(vaddr);
6415124Sgblack@eecs.umich.edu    }
6425086Sgblack@eecs.umich.edu    return NoFault;
6435086Sgblack@eecs.umich.edu};
6445086Sgblack@eecs.umich.edu
6455140Sgblack@eecs.umich.eduFault
6465140Sgblack@eecs.umich.eduDTB::translate(RequestPtr &req, ThreadContext *tc, bool write)
6475140Sgblack@eecs.umich.edu{
6485140Sgblack@eecs.umich.edu    return TLB::translate<FakeDTLBFault>(req, tc, write, false);
6495140Sgblack@eecs.umich.edu}
6505140Sgblack@eecs.umich.edu
6515140Sgblack@eecs.umich.eduFault
6525140Sgblack@eecs.umich.eduITB::translate(RequestPtr &req, ThreadContext *tc)
6535140Sgblack@eecs.umich.edu{
6545140Sgblack@eecs.umich.edu    return TLB::translate<FakeITLBFault>(req, tc, false, true);
6555140Sgblack@eecs.umich.edu}
6565140Sgblack@eecs.umich.edu
6575086Sgblack@eecs.umich.edu#if FULL_SYSTEM
6585086Sgblack@eecs.umich.edu
6595086Sgblack@eecs.umich.eduTick
6605086Sgblack@eecs.umich.eduDTB::doMmuRegRead(ThreadContext *tc, Packet *pkt)
6615086Sgblack@eecs.umich.edu{
6625100Ssaidi@eecs.umich.edu    return tc->getCpuPtr()->ticks(1);
6635086Sgblack@eecs.umich.edu}
6645086Sgblack@eecs.umich.edu
6655086Sgblack@eecs.umich.eduTick
6665086Sgblack@eecs.umich.eduDTB::doMmuRegWrite(ThreadContext *tc, Packet *pkt)
6675086Sgblack@eecs.umich.edu{
6685100Ssaidi@eecs.umich.edu    return tc->getCpuPtr()->ticks(1);
6695086Sgblack@eecs.umich.edu}
6705086Sgblack@eecs.umich.edu
6715086Sgblack@eecs.umich.edu#endif
6725086Sgblack@eecs.umich.edu
6735086Sgblack@eecs.umich.eduvoid
6745086Sgblack@eecs.umich.eduTLB::serialize(std::ostream &os)
6755086Sgblack@eecs.umich.edu{
6765086Sgblack@eecs.umich.edu}
6775086Sgblack@eecs.umich.edu
6785086Sgblack@eecs.umich.eduvoid
6795086Sgblack@eecs.umich.eduTLB::unserialize(Checkpoint *cp, const std::string &section)
6805086Sgblack@eecs.umich.edu{
6815086Sgblack@eecs.umich.edu}
6825086Sgblack@eecs.umich.edu
6835086Sgblack@eecs.umich.eduvoid
6845086Sgblack@eecs.umich.eduDTB::serialize(std::ostream &os)
6855086Sgblack@eecs.umich.edu{
6865086Sgblack@eecs.umich.edu    TLB::serialize(os);
6875086Sgblack@eecs.umich.edu}
6885086Sgblack@eecs.umich.edu
6895086Sgblack@eecs.umich.eduvoid
6905086Sgblack@eecs.umich.eduDTB::unserialize(Checkpoint *cp, const std::string &section)
6915086Sgblack@eecs.umich.edu{
6925086Sgblack@eecs.umich.edu    TLB::unserialize(cp, section);
6935086Sgblack@eecs.umich.edu}
6945086Sgblack@eecs.umich.edu
6955086Sgblack@eecs.umich.edu/* end namespace X86ISA */ }
6965086Sgblack@eecs.umich.edu
6974997Sgblack@eecs.umich.eduX86ISA::ITB *
6984997Sgblack@eecs.umich.eduX86ITBParams::create()
6994997Sgblack@eecs.umich.edu{
7005038Sgblack@eecs.umich.edu    return new X86ISA::ITB(this);
7014997Sgblack@eecs.umich.edu}
7024997Sgblack@eecs.umich.edu
7034997Sgblack@eecs.umich.eduX86ISA::DTB *
7044997Sgblack@eecs.umich.eduX86DTBParams::create()
7054997Sgblack@eecs.umich.edu{
7065038Sgblack@eecs.umich.edu    return new X86ISA::DTB(this);
7074997Sgblack@eecs.umich.edu}
708