pagetable_walker.hh revision 8711
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 54class ThreadContext; 55 56namespace X86ISA 57{ 58 class Walker : public MemObject 59 { 60 protected: 61 // Port for accessing memory 62 class WalkerPort : public Port 63 { 64 public: 65 WalkerPort(const std::string &_name, Walker * _walker) : 66 Port(_name, _walker), walker(_walker) 67 {} 68 69 protected: 70 Walker * walker; 71 72 bool recvTiming(PacketPtr pkt); 73 Tick recvAtomic(PacketPtr pkt); 74 void recvFunctional(PacketPtr pkt); 75 void recvRangeChange(); 76 void recvRetry(); 77 bool isSnooping() { return true; } 78 }; 79 80 friend class WalkerPort; 81 WalkerPort port; 82 Port *getPort(const std::string &if_name, int idx = -1); 83 84 // State to track each walk of the page table 85 class WalkerState : public FastAlloc 86 { 87 private: 88 enum State { 89 Ready, 90 Waiting, 91 // Long mode 92 LongPML4, LongPDP, LongPD, LongPTE, 93 // PAE legacy mode 94 PAEPDP, PAEPD, PAEPTE, 95 // Non PAE legacy mode with and without PSE 96 PSEPD, PD, PTE 97 }; 98 99 protected: 100 Walker * walker; 101 ThreadContext *tc; 102 RequestPtr req; 103 State state; 104 State nextState; 105 int dataSize; 106 bool enableNX; 107 unsigned inflight; 108 TlbEntry entry; 109 PacketPtr read; 110 std::vector<PacketPtr> writes; 111 Fault timingFault; 112 TLB::Translation * translation; 113 BaseTLB::Mode mode; 114 bool functional; 115 bool timing; 116 bool retrying; 117 bool started; 118 119 public: 120 WalkerState(Walker * _walker, BaseTLB::Translation *_translation, 121 RequestPtr _req, bool _isFunctional = false) : 122 walker(_walker), req(_req), state(Ready), 123 nextState(Ready), inflight(0), 124 translation(_translation), 125 functional(_isFunctional), timing(false), 126 retrying(false), started(false) 127 { 128 } 129 void initState(ThreadContext * _tc, BaseTLB::Mode _mode, 130 bool _isTiming = false); 131 Fault startWalk(); 132 Fault startFunctional(Addr &addr, Addr &pageSize); 133 bool recvPacket(PacketPtr pkt); 134 bool isRetrying(); 135 bool wasStarted(); 136 bool isTiming(); 137 void retry(); 138 std::string name() const {return walker->name();} 139 140 private: 141 void setupWalk(Addr vaddr); 142 Fault stepWalk(PacketPtr &write); 143 void sendPackets(); 144 void endWalk(); 145 Fault pageFault(bool present); 146 }; 147 148 friend class WalkerState; 149 // State for timing and atomic accesses (need multiple per walker in 150 // the case of multiple outstanding requests in timing mode) 151 std::list<WalkerState *> currStates; 152 // State for functional accesses (only need one of these per walker) 153 WalkerState funcState; 154 155 struct WalkerSenderState : public Packet::SenderState 156 { 157 WalkerState * senderWalk; 158 Packet::SenderState * saved; 159 WalkerSenderState(WalkerState * _senderWalk, 160 Packet::SenderState * _saved) : 161 senderWalk(_senderWalk), saved(_saved) {} 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 Addr &pageSize, BaseTLB::Mode mode); 170 171 protected: 172 // The TLB we're supposed to load. 173 TLB * tlb; 174 System * sys; 175 176 // Functions for dealing with packets. 177 bool recvTiming(PacketPtr pkt); 178 void recvRetry(); 179 bool sendTiming(WalkerState * sendingState, PacketPtr pkt); 180 181 public: 182 183 void setTLB(TLB * _tlb) 184 { 185 tlb = _tlb; 186 } 187 188 typedef X86PagetableWalkerParams Params; 189 190 Walker(const Params *params) : 191 MemObject(params), port(name() + ".port", this), 192 funcState(this, NULL, NULL, true), tlb(NULL), sys(params->system) 193 { 194 } 195 }; 196} 197#endif // __ARCH_X86_PAGE_TABLE_WALKER_HH__ 198