pagetable_walker.hh revision 8975
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/fast_alloc.hh" 48#include "base/types.hh" 49#include "mem/mem_object.hh" 50#include "mem/packet.hh" 51#include "params/X86PagetableWalker.hh" 52#include "sim/faults.hh" 53#include "sim/system.hh" 54 55class ThreadContext; 56 57namespace X86ISA 58{ 59 class Walker : public MemObject 60 { 61 protected: 62 // Port for accessing memory 63 class WalkerPort : public MasterPort 64 { 65 public: 66 WalkerPort(const std::string &_name, Walker * _walker) : 67 MasterPort(_name, _walker), walker(_walker) 68 {} 69 70 protected: 71 Walker *walker; 72 73 bool recvTimingResp(PacketPtr pkt); 74 75 /** 76 * Snooping a coherence request, do nothing. 77 */ 78 void recvTimingSnoopReq(PacketPtr pkt) { } 79 Tick recvAtomicSnoop(PacketPtr pkt) { return 0; } 80 void recvFunctionalSnoop(PacketPtr pkt) { } 81 void recvRetry(); 82 bool isSnooping() const { return true; } 83 }; 84 85 friend class WalkerPort; 86 WalkerPort port; 87 88 // State to track each walk of the page table 89 class WalkerState : public FastAlloc 90 { 91 private: 92 enum State { 93 Ready, 94 Waiting, 95 // Long mode 96 LongPML4, LongPDP, LongPD, LongPTE, 97 // PAE legacy mode 98 PAEPDP, PAEPD, PAEPTE, 99 // Non PAE legacy mode with and without PSE 100 PSEPD, PD, PTE 101 }; 102 103 protected: 104 Walker *walker; 105 ThreadContext *tc; 106 RequestPtr req; 107 State state; 108 State nextState; 109 int dataSize; 110 bool enableNX; 111 unsigned inflight; 112 TlbEntry entry; 113 PacketPtr read; 114 std::vector<PacketPtr> writes; 115 Fault timingFault; 116 TLB::Translation * translation; 117 BaseTLB::Mode mode; 118 bool functional; 119 bool timing; 120 bool retrying; 121 bool started; 122 public: 123 WalkerState(Walker * _walker, BaseTLB::Translation *_translation, 124 RequestPtr _req, bool _isFunctional = false) : 125 walker(_walker), req(_req), state(Ready), 126 nextState(Ready), inflight(0), 127 translation(_translation), 128 functional(_isFunctional), timing(false), 129 retrying(false), started(false) 130 { 131 } 132 void initState(ThreadContext * _tc, BaseTLB::Mode _mode, 133 bool _isTiming = false); 134 Fault startWalk(); 135 Fault startFunctional(Addr &addr, unsigned &logBytes); 136 bool recvPacket(PacketPtr pkt); 137 bool isRetrying(); 138 bool wasStarted(); 139 bool isTiming(); 140 void retry(); 141 std::string name() const {return walker->name();} 142 143 private: 144 void setupWalk(Addr vaddr); 145 Fault stepWalk(PacketPtr &write); 146 void sendPackets(); 147 void endWalk(); 148 Fault pageFault(bool present); 149 }; 150 151 friend class WalkerState; 152 // State for timing and atomic accesses (need multiple per walker in 153 // the case of multiple outstanding requests in timing mode) 154 std::list<WalkerState *> currStates; 155 // State for functional accesses (only need one of these per walker) 156 WalkerState funcState; 157 158 struct WalkerSenderState : public Packet::SenderState 159 { 160 WalkerState * senderWalk; 161 Packet::SenderState * saved; 162 WalkerSenderState(WalkerState * _senderWalk, 163 Packet::SenderState * _saved) : 164 senderWalk(_senderWalk), saved(_saved) {} 165 }; 166 167 public: 168 // Kick off the state machine. 169 Fault start(ThreadContext * _tc, BaseTLB::Translation *translation, 170 RequestPtr req, BaseTLB::Mode mode); 171 Fault startFunctional(ThreadContext * _tc, Addr &addr, 172 unsigned &logBytes, BaseTLB::Mode mode); 173 MasterPort &getMasterPort(const std::string &if_name, int idx = -1); 174 175 protected: 176 // The TLB we're supposed to load. 177 TLB * tlb; 178 System * sys; 179 MasterID masterId; 180 181 // Functions for dealing with packets. 182 bool recvTimingResp(PacketPtr pkt); 183 void recvRetry(); 184 bool sendTiming(WalkerState * sendingState, PacketPtr pkt); 185 186 public: 187 188 void setTLB(TLB * _tlb) 189 { 190 tlb = _tlb; 191 } 192 193 typedef X86PagetableWalkerParams Params; 194 195 const Params * 196 params() const 197 { 198 return static_cast<const Params *>(_params); 199 } 200 201 Walker(const Params *params) : 202 MemObject(params), port(name() + ".port", this), 203 funcState(this, NULL, NULL, true), tlb(NULL), sys(params->system), 204 masterId(sys->getMasterId(name())) 205 { 206 } 207 }; 208} 209#endif // __ARCH_X86_PAGE_TABLE_WALKER_HH__ 210