1/* 2 * Copyright (c) 2007 The Hewlett-Packard Development Company 3 * All rights reserved. 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions are 16 * met: redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer; 18 * redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution; 21 * neither the name of the copyright holders nor the names of its 22 * contributors may be used to endorse or promote products derived from 23 * this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 * 37 * Authors: Gabe Black 38 */ 39 40#ifndef __ARCH_X86_PAGE_TABLE_WALKER_HH__ 41#define __ARCH_X86_PAGE_TABLE_WALKER_HH__ 42 43#include <vector> 44 45#include "arch/x86/pagetable.hh" 46#include "arch/x86/tlb.hh" 47#include "base/types.hh" 48#include "mem/mem_object.hh" 49#include "mem/packet.hh" 50#include "params/X86PagetableWalker.hh" 51#include "sim/faults.hh" 52#include "sim/system.hh" 53 54class ThreadContext; 55 56namespace X86ISA 57{ 58 class Walker : public MemObject 59 { 60 protected: 61 // Port for accessing memory 62 class WalkerPort : public MasterPort 63 { 64 public: 65 WalkerPort(const std::string &_name, Walker * _walker) : 66 MasterPort(_name, _walker), walker(_walker) 67 {} 68 69 protected: 70 Walker *walker; 71 72 bool recvTimingResp(PacketPtr pkt); 73 74 /** 75 * Snooping a coherence request, do nothing. 76 */ 77 void recvTimingSnoopReq(PacketPtr pkt) { } 78 Tick recvAtomicSnoop(PacketPtr pkt) { return 0; } 79 void recvFunctionalSnoop(PacketPtr pkt) { } 80 void recvRetry(); 81 bool isSnooping() const { return true; } 82 }; 83 84 friend class WalkerPort; 85 WalkerPort port; 86 87 // State to track each walk of the page table 88 class WalkerState 89 { 90 private: 91 enum State { 92 Ready, 93 Waiting, 94 // Long mode 95 LongPML4, LongPDP, LongPD, LongPTE, 96 // PAE legacy mode 97 PAEPDP, PAEPD, PAEPTE, 98 // Non PAE legacy mode with and without PSE 99 PSEPD, PD, PTE 100 }; 101 102 protected: 103 Walker *walker; 104 ThreadContext *tc; 105 RequestPtr req; 106 State state; 107 State nextState; 108 int dataSize; 109 bool enableNX; 110 unsigned inflight; 111 TlbEntry entry; 112 PacketPtr read; 113 std::vector<PacketPtr> writes; 114 Fault timingFault; 115 TLB::Translation * translation; 116 BaseTLB::Mode mode; 117 bool functional; 118 bool timing; 119 bool retrying; 120 bool started; 121 public: 122 WalkerState(Walker * _walker, BaseTLB::Translation *_translation, 123 RequestPtr _req, bool _isFunctional = false) : 124 walker(_walker), req(_req), state(Ready), 125 nextState(Ready), inflight(0), 126 translation(_translation), 127 functional(_isFunctional), timing(false), 128 retrying(false), started(false) 129 { 130 } 131 void initState(ThreadContext * _tc, BaseTLB::Mode _mode, 132 bool _isTiming = false); 133 Fault startWalk(); 134 Fault startFunctional(Addr &addr, unsigned &logBytes); 135 bool recvPacket(PacketPtr pkt); 136 bool isRetrying(); 137 bool wasStarted(); 138 bool isTiming(); 139 void retry(); 140 std::string name() const {return walker->name();} 141 142 private: 143 void setupWalk(Addr vaddr); 144 Fault stepWalk(PacketPtr &write); 145 void sendPackets(); 146 void endWalk(); 147 Fault pageFault(bool present); 148 }; 149 150 friend class WalkerState; 151 // State for timing and atomic accesses (need multiple per walker in 152 // the case of multiple outstanding requests in timing mode) 153 std::list<WalkerState *> currStates; 154 // State for functional accesses (only need one of these per walker) 155 WalkerState funcState; 156 157 struct WalkerSenderState : public Packet::SenderState 158 { 159 WalkerState * senderWalk;
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162 }; 163 164 public: 165 // Kick off the state machine. 166 Fault start(ThreadContext * _tc, BaseTLB::Translation *translation, 167 RequestPtr req, BaseTLB::Mode mode); 168 Fault startFunctional(ThreadContext * _tc, Addr &addr, 169 unsigned &logBytes, BaseTLB::Mode mode); 170 BaseMasterPort &getMasterPort(const std::string &if_name, 171 PortID idx = InvalidPortID); 172 173 protected: 174 // The TLB we're supposed to load. 175 TLB * tlb; 176 System * sys; 177 MasterID masterId; 178 179 // Functions for dealing with packets. 180 bool recvTimingResp(PacketPtr pkt); 181 void recvRetry(); 182 bool sendTiming(WalkerState * sendingState, PacketPtr pkt); 183 184 public: 185 186 void setTLB(TLB * _tlb) 187 { 188 tlb = _tlb; 189 } 190 191 typedef X86PagetableWalkerParams Params; 192 193 const Params * 194 params() const 195 { 196 return static_cast<const Params *>(_params); 197 } 198 199 Walker(const Params *params) : 200 MemObject(params), port(name() + ".port", this), 201 funcState(this, NULL, NULL, true), tlb(NULL), sys(params->system), 202 masterId(sys->getMasterId(name())) 203 { 204 } 205 }; 206} 207#endif // __ARCH_X86_PAGE_TABLE_WALKER_HH__
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