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40 #ifndef __ARCH_X86_PAGE_TABLE_WALKER_HH__
41 #define __ARCH_X86_PAGE_TABLE_WALKER_HH__
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"
58 class Walker : public MemObject
61 // Port for accessing memory
62 class WalkerPort : public MasterPort
65 WalkerPort(const std::string &_name, Walker * _walker) :
66 MasterPort(_name, _walker), walker(_walker)
72 bool recvTimingResp(PacketPtr pkt);
75 * Snooping a coherence request, do nothing.
77 void recvTimingSnoopReq(PacketPtr pkt) { }
78 Tick recvAtomicSnoop(PacketPtr pkt) { return 0; }
79 void recvFunctionalSnoop(PacketPtr pkt) { }
81 bool isSnooping() const { return true; }
84 friend class WalkerPort;
87 // State to track each walk of the page table
96 LongPML4, LongPDP, LongPD, LongPTE,
98 PAEPDP, PAEPD, PAEPTE,
99 // Non PAE legacy mode with and without PSE
114 std::vector<PacketPtr> writes;
116 TLB::Translation * translation;
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)
132 void initState(ThreadContext * _tc, BaseTLB::Mode _mode,
133 bool _isTiming = false);
135 Fault startFunctional(Addr &addr, unsigned &logBytes);
136 bool recvPacket(PacketPtr pkt);
141 std::string name() const {return walker->name();}
144 void setupWalk(Addr vaddr);
145 Fault stepWalk(PacketPtr &write);
148 Fault pageFault(bool present);
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;
158 struct WalkerSenderState : public Packet::SenderState
160 WalkerState * senderWalk;
161 WalkerSenderState(WalkerState * _senderWalk) :
162 senderWalk(_senderWalk) {}
166 // Kick off the state machine.
167 Fault start(ThreadContext * _tc, BaseTLB::Translation *translation,
168 RequestPtr req, BaseTLB::Mode mode);
169 Fault startFunctional(ThreadContext * _tc, Addr &addr,
170 unsigned &logBytes, BaseTLB::Mode mode);
171 BaseMasterPort &getMasterPort(const std::string &if_name,
172 PortID idx = InvalidPortID);
175 // The TLB we're supposed to load.
180 // The number of outstanding walks that can be squashed per cycle.
181 unsigned numSquashable;
183 // Wrapper for checking for squashes before starting a translation.
184 void startWalkWrapper();
186 // Functions for dealing with packets.
187 bool recvTimingResp(PacketPtr pkt);
189 bool sendTiming(WalkerState * sendingState, PacketPtr pkt);
193 void setTLB(TLB * _tlb)
198 typedef X86PagetableWalkerParams Params;
203 return static_cast<const Params *>(_params);
206 Walker(const Params *params) :
207 MemObject(params), port(name() + ".port", this),
208 funcState(this, NULL, NULL, true), tlb(NULL), sys(params->system),
209 masterId(sys->getMasterId(name())),
210 numSquashable(params->num_squash_per_cycle)
215 #endif // __ARCH_X86_PAGE_TABLE_WALKER_HH__