pagetable_walker.hh revision 13784:1941dc118243
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 void recvReqRetry(); 74 }; 75 76 friend class WalkerPort; 77 WalkerPort port; 78 79 // State to track each walk of the page table 80 class WalkerState 81 { 82 friend class Walker; 83 private: 84 enum State { 85 Ready, 86 Waiting, 87 // Long mode 88 LongPML4, LongPDP, LongPD, LongPTE, 89 // PAE legacy mode 90 PAEPDP, PAEPD, PAEPTE, 91 // Non PAE legacy mode with and without PSE 92 PSEPD, PD, PTE 93 }; 94 95 protected: 96 Walker *walker; 97 ThreadContext *tc; 98 RequestPtr req; 99 State state; 100 State nextState; 101 int dataSize; 102 bool enableNX; 103 unsigned inflight; 104 TlbEntry entry; 105 PacketPtr read; 106 std::vector<PacketPtr> writes; 107 Fault timingFault; 108 TLB::Translation * translation; 109 BaseTLB::Mode mode; 110 bool functional; 111 bool timing; 112 bool retrying; 113 bool started; 114 public: 115 WalkerState(Walker * _walker, BaseTLB::Translation *_translation, 116 const RequestPtr &_req, bool _isFunctional = false) : 117 walker(_walker), req(_req), state(Ready), 118 nextState(Ready), inflight(0), 119 translation(_translation), 120 functional(_isFunctional), timing(false), 121 retrying(false), started(false) 122 { 123 } 124 void initState(ThreadContext * _tc, BaseTLB::Mode _mode, 125 bool _isTiming = false); 126 Fault startWalk(); 127 Fault startFunctional(Addr &addr, unsigned &logBytes); 128 bool recvPacket(PacketPtr pkt); 129 bool isRetrying(); 130 bool wasStarted(); 131 bool isTiming(); 132 void retry(); 133 std::string name() const {return walker->name();} 134 135 private: 136 void setupWalk(Addr vaddr); 137 Fault stepWalk(PacketPtr &write); 138 void sendPackets(); 139 void endWalk(); 140 Fault pageFault(bool present); 141 }; 142 143 friend class WalkerState; 144 // State for timing and atomic accesses (need multiple per walker in 145 // the case of multiple outstanding requests in timing mode) 146 std::list<WalkerState *> currStates; 147 // State for functional accesses (only need one of these per walker) 148 WalkerState funcState; 149 150 struct WalkerSenderState : public Packet::SenderState 151 { 152 WalkerState * senderWalk; 153 WalkerSenderState(WalkerState * _senderWalk) : 154 senderWalk(_senderWalk) {} 155 }; 156 157 public: 158 // Kick off the state machine. 159 Fault start(ThreadContext * _tc, BaseTLB::Translation *translation, 160 const RequestPtr &req, BaseTLB::Mode mode); 161 Fault startFunctional(ThreadContext * _tc, Addr &addr, 162 unsigned &logBytes, BaseTLB::Mode mode); 163 Port &getPort(const std::string &if_name, 164 PortID idx=InvalidPortID) override; 165 166 protected: 167 // The TLB we're supposed to load. 168 TLB * tlb; 169 System * sys; 170 MasterID masterId; 171 172 // The number of outstanding walks that can be squashed per cycle. 173 unsigned numSquashable; 174 175 // Wrapper for checking for squashes before starting a translation. 176 void startWalkWrapper(); 177 178 /** 179 * Event used to call startWalkWrapper. 180 **/ 181 EventFunctionWrapper startWalkWrapperEvent; 182 183 // Functions for dealing with packets. 184 bool recvTimingResp(PacketPtr pkt); 185 void recvReqRetry(); 186 bool sendTiming(WalkerState * sendingState, PacketPtr pkt); 187 188 public: 189 190 void setTLB(TLB * _tlb) 191 { 192 tlb = _tlb; 193 } 194 195 typedef X86PagetableWalkerParams Params; 196 197 const Params * 198 params() const 199 { 200 return static_cast<const Params *>(_params); 201 } 202 203 Walker(const Params *params) : 204 MemObject(params), port(name() + ".port", this), 205 funcState(this, NULL, NULL, true), tlb(NULL), sys(params->system), 206 masterId(sys->getMasterId(this)), 207 numSquashable(params->num_squash_per_cycle), 208 startWalkWrapperEvent([this]{ startWalkWrapper(); }, name()) 209 { 210 } 211 }; 212} 213#endif // __ARCH_X86_PAGE_TABLE_WALKER_HH__ 214