#include "arch/x86/pagetable.hh"
#include "arch/x86/tlb.hh"
#include "base/types.hh"
+#include "base/fast_alloc.hh"
#include "mem/mem_object.hh"
#include "mem/packet.hh"
#include "params/X86PagetableWalker.hh"
{
class Walker : public MemObject
{
- public:
- enum State {
- Ready,
- Waiting,
- // Long mode
- LongPML4, LongPDP, LongPD, LongPTE,
- // PAE legacy mode
- PAEPDP, PAEPD, PAEPTE,
- // Non PAE legacy mode with and without PSE
- PSEPD, PD, PTE
- };
-
- // Act on the current state and determine what to do next. The global
- // read should be the packet that just came back from a read and write
- // should be NULL. When the function returns, read is either NULL
- // if the machine is finished, or points to a packet to initiate
- // the next read. If any write is required to update an "accessed"
- // bit, write will point to a packet to do the write. Otherwise it
- // will be NULL. The return value is whatever fault was incurred
- // during this stage of the lookup.
- Fault doNext(PacketPtr &write);
-
- // Kick off the state machine.
- Fault start(ThreadContext * _tc, BaseTLB::Translation *translation,
- RequestPtr req, BaseTLB::Mode mode);
- // Clean up after the state machine.
- void
- stop()
- {
- nextState = Ready;
- delete read->req;
- delete read;
- read = NULL;
- }
-
protected:
-
- /*
- * State having to do with sending packets.
- */
- PacketPtr read;
- std::vector<PacketPtr> writes;
-
- // How many memory operations are in flight.
- unsigned inflight;
-
- bool retrying;
-
- /*
- * The fault, if any, that's waiting to be delivered in timing mode.
- */
- Fault timingFault;
-
- /*
- * Functions for dealing with packets.
- */
- bool recvTiming(PacketPtr pkt);
- void recvRetry();
-
- void sendPackets();
-
- /*
- * Port for accessing memory
- */
+ // Port for accessing memory
class WalkerPort : public Port
{
public:
}
};
+ friend class WalkerPort;
+ WalkerPort port;
Port *getPort(const std::string &if_name, int idx = -1);
- friend class WalkerPort;
+ // State to track each walk of the page table
+ class WalkerState : public FastAlloc
+ {
+ private:
+ enum State {
+ Ready,
+ Waiting,
+ // Long mode
+ LongPML4, LongPDP, LongPD, LongPTE,
+ // PAE legacy mode
+ PAEPDP, PAEPD, PAEPTE,
+ // Non PAE legacy mode with and without PSE
+ PSEPD, PD, PTE
+ };
- WalkerPort port;
+ protected:
+ Walker * walker;
+ ThreadContext *tc;
+ RequestPtr req;
+ State state;
+ State nextState;
+ int dataSize;
+ bool enableNX;
+ unsigned inflight;
+ TlbEntry entry;
+ PacketPtr read;
+ std::vector<PacketPtr> writes;
+ Fault timingFault;
+ TLB::Translation * translation;
+ BaseTLB::Mode mode;
+ bool functional;
+ bool timing;
+ bool retrying;
+ bool started;
+
+ public:
+ WalkerState(Walker * _walker, BaseTLB::Translation *_translation,
+ RequestPtr _req, bool _isFunctional = false) :
+ walker(_walker), req(_req), state(Ready),
+ nextState(Ready), inflight(0),
+ translation(_translation),
+ functional(_isFunctional), timing(false),
+ retrying(false), started(false)
+ {
+ }
+ void initState(ThreadContext * _tc, BaseTLB::Mode _mode,
+ bool _isTiming = false);
+ Fault startWalk();
+ Fault startFunctional(Addr &addr, Addr &pageSize);
+ bool recvPacket(PacketPtr pkt);
+ bool isRetrying();
+ bool wasStarted();
+ bool isTiming();
+ void retry();
+ std::string name() const {return walker->name();}
+
+ private:
+ void setupWalk(Addr vaddr);
+ Fault stepWalk(PacketPtr &write);
+ void sendPackets();
+ void endWalk();
+ Fault pageFault(bool present);
+ };
+
+ friend class WalkerState;
+ // State for timing and atomic accesses (need multiple per walker in
+ // the case of multiple outstanding requests in timing mode)
+ std::list<WalkerState *> currStates;
+ // State for functional accesses (only need one of these per walker)
+ WalkerState funcState;
+
+ struct WalkerSenderState : public Packet::SenderState
+ {
+ WalkerState * senderWalk;
+ Packet::SenderState * saved;
+ WalkerSenderState(WalkerState * _senderWalk,
+ Packet::SenderState * _saved) :
+ senderWalk(_senderWalk), saved(_saved) {}
+ };
+ public:
+ // Kick off the state machine.
+ Fault start(ThreadContext * _tc, BaseTLB::Translation *translation,
+ RequestPtr req, BaseTLB::Mode mode);
+ Fault startFunctional(ThreadContext * _tc, Addr &addr,
+ Addr &pageSize, BaseTLB::Mode mode);
+
+ protected:
// The TLB we're supposed to load.
TLB * tlb;
System * sys;
- BaseTLB::Translation * translation;
-
- /*
- * State machine state.
- */
- ThreadContext * tc;
- RequestPtr req;
- State state;
- State nextState;
- int size;
- bool enableNX;
- BaseTLB::Mode mode;
- bool user;
- TlbEntry entry;
-
- Fault pageFault(bool present);
+
+ // Functions for dealing with packets.
+ bool recvTiming(PacketPtr pkt);
+ void recvRetry();
+ bool sendTiming(WalkerState * sendingState, PacketPtr pkt);
public:
typedef X86PagetableWalkerParams Params;
Walker(const Params *params) :
- MemObject(params),
- read(NULL), inflight(0), retrying(false),
- port(name() + ".port", this),
- tlb(NULL), sys(params->system),
- tc(NULL), state(Ready), nextState(Ready)
+ MemObject(params), port(name() + ".port", this),
+ funcState(this, NULL, NULL, true), tlb(NULL), sys(params->system)
{
}
};
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