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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"
56 class Walker : public MemObject
63 LongPML4, LongPDP, LongPD, LongPTE,
65 PAEPDP, PAEPD, PAEPTE,
66 // Non PAE legacy mode with and without PSE
70 // Act on the current state and determine what to do next. The global
71 // read should be the packet that just came back from a read and write
72 // should be NULL. When the function returns, read is either NULL
73 // if the machine is finished, or points to a packet to initiate
74 // the next read. If any write is required to update an "accessed"
75 // bit, write will point to a packet to do the write. Otherwise it
76 // will be NULL. The return value is whatever fault was incurred
77 // during this stage of the lookup.
78 Fault doNext(PacketPtr &write);
80 // Kick off the state machine.
81 Fault start(ThreadContext * _tc, BaseTLB::Translation *translation,
82 RequestPtr req, BaseTLB::Mode mode);
83 // Clean up after the state machine.
96 * State having to do with sending packets.
99 std::vector<PacketPtr> writes;
101 // How many memory operations are in flight.
107 * The fault, if any, that's waiting to be delivered in timing mode.
112 * Functions for dealing with packets.
114 bool recvTiming(PacketPtr pkt);
120 * Port for accessing memory
122 class WalkerPort : public Port
125 WalkerPort(const std::string &_name, Walker * _walker) :
126 Port(_name, _walker), walker(_walker),
127 snoopRangeSent(false)
135 bool recvTiming(PacketPtr pkt);
136 Tick recvAtomic(PacketPtr pkt);
137 void recvFunctional(PacketPtr pkt);
138 void recvStatusChange(Status status);
140 void getDeviceAddressRanges(AddrRangeList &resp,
148 Port *getPort(const std::string &if_name, int idx = -1);
150 friend class WalkerPort;
154 // The TLB we're supposed to load.
157 BaseTLB::Translation * translation;
160 * State machine state.
172 Fault pageFault(bool present);
176 void setTLB(TLB * _tlb)
181 typedef X86PagetableWalkerParams Params;
183 Walker(const Params *params) :
185 read(NULL), inflight(0), retrying(false),
186 port(name() + ".port", this),
187 tlb(NULL), sys(params->system),
188 tc(NULL), state(Ready), nextState(Ready)
193 #endif // __ARCH_X86_PAGE_TABLE_WALKER_HH__