tlb.hh revision 5242
1/* 2 * Copyright (c) 2007 The Hewlett-Packard Development Company 3 * All rights reserved. 4 * 5 * Redistribution and use of this software in source and binary forms, 6 * with or without modification, are permitted provided that the 7 * following conditions are met: 8 * 9 * The software must be used only for Non-Commercial Use which means any 10 * use which is NOT directed to receiving any direct monetary 11 * compensation for, or commercial advantage from such use. Illustrative 12 * examples of non-commercial use are academic research, personal study, 13 * teaching, education and corporate research & development. 14 * Illustrative examples of commercial use are distributing products for 15 * commercial advantage and providing services using the software for 16 * commercial advantage. 17 * 18 * If you wish to use this software or functionality therein that may be 19 * covered by patents for commercial use, please contact: 20 * Director of Intellectual Property Licensing 21 * Office of Strategy and Technology 22 * Hewlett-Packard Company 23 * 1501 Page Mill Road 24 * Palo Alto, California 94304 25 * 26 * Redistributions of source code must retain the above copyright notice, 27 * this list of conditions and the following disclaimer. Redistributions 28 * in binary form must reproduce the above copyright notice, this list of 29 * conditions and the following disclaimer in the documentation and/or 30 * other materials provided with the distribution. Neither the name of 31 * the COPYRIGHT HOLDER(s), HEWLETT-PACKARD COMPANY, nor the names of its 32 * contributors may be used to endorse or promote products derived from 33 * this software without specific prior written permission. No right of 34 * sublicense is granted herewith. Derivatives of the software and 35 * output created using the software may be prepared, but only for 36 * Non-Commercial Uses. Derivatives of the software may be shared with 37 * others provided: (i) the others agree to abide by the list of 38 * conditions herein which includes the Non-Commercial Use restrictions; 39 * and (ii) such Derivatives of the software include the above copyright 40 * notice to acknowledge the contribution from this software where 41 * applicable, this list of conditions and the disclaimer below. 42 * 43 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 44 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 45 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 46 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 47 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 48 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 49 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 50 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 51 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 52 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 53 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 54 * 55 * Authors: Gabe Black 56 */ 57 58#ifndef __ARCH_X86_TLB_HH__ 59#define __ARCH_X86_TLB_HH__ 60 61#include <list> 62#include <vector> 63#include <string> 64 65#include "arch/x86/pagetable.hh" 66#include "arch/x86/segmentregs.hh" 67#include "config/full_system.hh" 68#include "mem/mem_object.hh" 69#include "mem/request.hh" 70#include "params/X86DTB.hh" 71#include "params/X86ITB.hh" 72#include "sim/faults.hh" 73#include "sim/sim_object.hh" 74 75class ThreadContext; 76class Packet; 77 78namespace X86ISA 79{ 80 static const unsigned StoreCheck = 1 << NUM_SEGMENTREGS; 81 82 class TLB; 83 84 class TLB : public MemObject 85 { 86 protected: 87 friend class FakeITLBFault; 88 friend class FakeDTLBFault; 89 90 System * sys; 91 92 bool allowNX; 93 94 public: 95 typedef X86TLBParams Params; 96 TLB(const Params *p); 97 98 void dumpAll(); 99 100 TlbEntry *lookup(Addr va, bool update_lru = true); 101 102#if FULL_SYSTEM 103 protected: 104 class Walker 105 { 106 public: 107 enum State { 108 Ready, 109 Waiting, 110 LongPML4, 111 LongPDP, 112 LongPD, 113 LongPTE, 114 PAEPDP, 115 PAEPD, 116 PAEPTE, 117 PSEPD, 118 PD, 119 PTE 120 }; 121 122 // Act on the current state and determine what to do next. read 123 // should be the packet that just came back from a read and write 124 // should be NULL. When the function returns, read is either NULL 125 // if the machine is finished, or points to a packet to initiate 126 // the next read. If any write is required to update an "accessed" 127 // bit, write will point to a packet to do the write. Otherwise it 128 // will be NULL. 129 void doNext(PacketPtr &read, PacketPtr &write); 130 131 // Kick off the state machine. 132 void start(ThreadContext * _tc, Addr vaddr); 133 134 protected: 135 friend class TLB; 136 137 /* 138 * State having to do with sending packets. 139 */ 140 PacketPtr read; 141 std::vector<PacketPtr> writes; 142 143 // How many memory operations are in flight. 144 unsigned inflight; 145 146 bool retrying; 147 148 /* 149 * Functions for dealing with packets. 150 */ 151 bool recvTiming(PacketPtr pkt); 152 void recvRetry(); 153 154 void sendPackets(); 155 156 /* 157 * Port for accessing memory 158 */ 159 class WalkerPort : public Port 160 { 161 public: 162 WalkerPort(const std::string &_name, Walker * _walker) : 163 Port(_name, _walker->tlb), walker(_walker), 164 snoopRangeSent(false) 165 {} 166 167 protected: 168 Walker * walker; 169 170 bool snoopRangeSent; 171 172 bool recvTiming(PacketPtr pkt); 173 Tick recvAtomic(PacketPtr pkt); 174 void recvFunctional(PacketPtr pkt); 175 void recvStatusChange(Status status); 176 void recvRetry(); 177 void getDeviceAddressRanges(AddrRangeList &resp, 178 bool &snoop) 179 { 180 resp.clear(); 181 snoop = true; 182 } 183 }; 184 185 friend class WalkerPort; 186 187 WalkerPort port; 188 189 // The TLB we're supposed to load. 190 TLB * tlb; 191 192 /* 193 * State machine state. 194 */ 195 ThreadContext * tc; 196 State state; 197 State nextState; 198 int size; 199 bool enableNX; 200 TlbEntry entry; 201 202 public: 203 Walker(const std::string &_name, TLB * _tlb) : 204 read(NULL), inflight(0), retrying(false), 205 port(_name + "-walker_port", this), 206 tlb(_tlb), 207 tc(NULL), state(Ready), nextState(Ready) 208 { 209 } 210 }; 211 212 Walker walker; 213 214#endif 215 216 Port *getPort(const std::string &if_name, int idx = -1); 217 218 public: 219 void invalidateAll(); 220 221 void invalidateNonGlobal(); 222 223 void demapPage(Addr va); 224 225 protected: 226 int size; 227 228 TlbEntry * tlb; 229 230 typedef std::list<TlbEntry *> EntryList; 231 EntryList freeList; 232 EntryList entryList; 233 234 void insert(Addr vpn, TlbEntry &entry); 235 236 template<class TlbFault> 237 Fault translate(RequestPtr &req, ThreadContext *tc, 238 bool write, bool execute); 239 240 public: 241 // Checkpointing 242 virtual void serialize(std::ostream &os); 243 virtual void unserialize(Checkpoint *cp, const std::string §ion); 244 }; 245 246 class ITB : public TLB 247 { 248 public: 249 typedef X86ITBParams Params; 250 ITB(const Params *p) : TLB(p) 251 { 252 sys = p->system; 253 allowNX = false; 254 } 255 256 Fault translate(RequestPtr &req, ThreadContext *tc); 257 258 friend class DTB; 259 }; 260 261 class DTB : public TLB 262 { 263 public: 264 typedef X86DTBParams Params; 265 DTB(const Params *p) : TLB(p) 266 { 267 sys = p->system; 268 allowNX = true; 269 } 270 Fault translate(RequestPtr &req, ThreadContext *tc, bool write); 271#if FULL_SYSTEM 272 Tick doMmuRegRead(ThreadContext *tc, Packet *pkt); 273 Tick doMmuRegWrite(ThreadContext *tc, Packet *pkt); 274#endif 275 276 // Checkpointing 277 virtual void serialize(std::ostream &os); 278 virtual void unserialize(Checkpoint *cp, const std::string §ion); 279 }; 280} 281 282#endif // __ARCH_X86_TLB_HH__ 283