pagetable_walker.hh revision 8229:78bf55f23338
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 snoopRangeSent(false) 68 {} 69 70 protected: 71 Walker * walker; 72 73 bool snoopRangeSent; 74 75 bool recvTiming(PacketPtr pkt); 76 Tick recvAtomic(PacketPtr pkt); 77 void recvFunctional(PacketPtr pkt); 78 void recvStatusChange(Status status); 79 void recvRetry(); 80 void getDeviceAddressRanges(AddrRangeList &resp, 81 bool &snoop) 82 { 83 resp.clear(); 84 snoop = true; 85 } 86 }; 87 88 friend class WalkerPort; 89 WalkerPort port; 90 Port *getPort(const std::string &if_name, int idx = -1); 91 92 // State to track each walk of the page table 93 class WalkerState : public FastAlloc 94 { 95 private: 96 enum State { 97 Ready, 98 Waiting, 99 // Long mode 100 LongPML4, LongPDP, LongPD, LongPTE, 101 // PAE legacy mode 102 PAEPDP, PAEPD, PAEPTE, 103 // Non PAE legacy mode with and without PSE 104 PSEPD, PD, PTE 105 }; 106 107 protected: 108 Walker * walker; 109 ThreadContext *tc; 110 RequestPtr req; 111 State state; 112 State nextState; 113 int dataSize; 114 bool enableNX; 115 unsigned inflight; 116 TlbEntry entry; 117 PacketPtr read; 118 std::vector<PacketPtr> writes; 119 Fault timingFault; 120 TLB::Translation * translation; 121 BaseTLB::Mode mode; 122 bool functional; 123 bool timing; 124 bool retrying; 125 bool started; 126 127 public: 128 WalkerState(Walker * _walker, BaseTLB::Translation *_translation, 129 RequestPtr _req, bool _isFunctional = false) : 130 walker(_walker), req(_req), state(Ready), 131 nextState(Ready), inflight(0), 132 translation(_translation), 133 functional(_isFunctional), timing(false), 134 retrying(false), started(false) 135 { 136 } 137 void initState(ThreadContext * _tc, BaseTLB::Mode _mode, 138 bool _isTiming = false); 139 Fault startWalk(); 140 Fault startFunctional(Addr &addr, Addr &pageSize); 141 bool recvPacket(PacketPtr pkt); 142 bool isRetrying(); 143 bool wasStarted(); 144 bool isTiming(); 145 void retry(); 146 std::string name() const {return walker->name();} 147 148 private: 149 void setupWalk(Addr vaddr); 150 Fault stepWalk(PacketPtr &write); 151 void sendPackets(); 152 void endWalk(); 153 Fault pageFault(bool present); 154 }; 155 156 friend class WalkerState; 157 // State for timing and atomic accesses (need multiple per walker in 158 // the case of multiple outstanding requests in timing mode) 159 std::list<WalkerState *> currStates; 160 // State for functional accesses (only need one of these per walker) 161 WalkerState funcState; 162 163 struct WalkerSenderState : public Packet::SenderState 164 { 165 WalkerState * senderWalk; 166 Packet::SenderState * saved; 167 WalkerSenderState(WalkerState * _senderWalk, 168 Packet::SenderState * _saved) : 169 senderWalk(_senderWalk), saved(_saved) {} 170 }; 171 172 public: 173 // Kick off the state machine. 174 Fault start(ThreadContext * _tc, BaseTLB::Translation *translation, 175 RequestPtr req, BaseTLB::Mode mode); 176 Fault startFunctional(ThreadContext * _tc, Addr &addr, 177 Addr &pageSize, BaseTLB::Mode mode); 178 179 protected: 180 // The TLB we're supposed to load. 181 TLB * tlb; 182 System * sys; 183 184 // Functions for dealing with packets. 185 bool recvTiming(PacketPtr pkt); 186 void recvRetry(); 187 bool sendTiming(WalkerState * sendingState, PacketPtr pkt); 188 189 public: 190 191 void setTLB(TLB * _tlb) 192 { 193 tlb = _tlb; 194 } 195 196 typedef X86PagetableWalkerParams Params; 197 198 Walker(const Params *params) : 199 MemObject(params), port(name() + ".port", this), 200 funcState(this, NULL, NULL, true), tlb(NULL), sys(params->system) 201 { 202 } 203 }; 204} 205#endif // __ARCH_X86_PAGE_TABLE_WALKER_HH__ 206