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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/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"
59 class Walker : public MemObject
62 // Port for accessing memory
63 class WalkerPort : public Port
66 WalkerPort(const std::string &_name, Walker * _walker) :
67 Port(_name, _walker), walker(_walker)
73 bool recvTiming(PacketPtr pkt);
74 Tick recvAtomic(PacketPtr pkt);
75 void recvFunctional(PacketPtr pkt);
76 void recvRangeChange();
78 bool isSnooping() { return true; }
81 friend class WalkerPort;
84 // State to track each walk of the page table
85 class WalkerState : public FastAlloc
92 LongPML4, LongPDP, LongPD, LongPTE,
94 PAEPDP, PAEPD, PAEPTE,
95 // Non PAE legacy mode with and without PSE
110 std::vector<PacketPtr> writes;
112 TLB::Translation * translation;
119 WalkerState(Walker * _walker, BaseTLB::Translation *_translation,
120 RequestPtr _req, bool _isFunctional = false) :
121 walker(_walker), req(_req), state(Ready),
122 nextState(Ready), inflight(0),
123 translation(_translation),
124 functional(_isFunctional), timing(false),
125 retrying(false), started(false)
128 void initState(ThreadContext * _tc, BaseTLB::Mode _mode,
129 bool _isTiming = false);
131 Fault startFunctional(Addr &addr, Addr &pageSize);
132 bool recvPacket(PacketPtr pkt);
137 std::string name() const {return walker->name();}
140 void setupWalk(Addr vaddr);
141 Fault stepWalk(PacketPtr &write);
144 Fault pageFault(bool present);
147 friend class WalkerState;
148 // State for timing and atomic accesses (need multiple per walker in
149 // the case of multiple outstanding requests in timing mode)
150 std::list<WalkerState *> currStates;
151 // State for functional accesses (only need one of these per walker)
152 WalkerState funcState;
154 struct WalkerSenderState : public Packet::SenderState
156 WalkerState * senderWalk;
157 Packet::SenderState * saved;
158 WalkerSenderState(WalkerState * _senderWalk,
159 Packet::SenderState * _saved) :
160 senderWalk(_senderWalk), saved(_saved) {}
164 // Kick off the state machine.
165 Fault start(ThreadContext * _tc, BaseTLB::Translation *translation,
166 RequestPtr req, BaseTLB::Mode mode);
167 Fault startFunctional(ThreadContext * _tc, Addr &addr,
168 Addr &pageSize, BaseTLB::Mode mode);
169 Port *getPort(const std::string &if_name, int idx = -1);
172 // The TLB we're supposed to load.
177 // Functions for dealing with packets.
178 bool recvTiming(PacketPtr pkt);
180 bool sendTiming(WalkerState * sendingState, PacketPtr pkt);
184 void setTLB(TLB * _tlb)
189 typedef X86PagetableWalkerParams Params;
194 return static_cast<const Params *>(_params);
197 Walker(const Params *params) :
198 MemObject(params), port(name() + ".port", this),
199 funcState(this, NULL, NULL, true), tlb(NULL), sys(params->system),
200 masterId(sys->getMasterId(name()))
205 #endif // __ARCH_X86_PAGE_TABLE_WALKER_HH__