* Copyright (c) 2007 The Hewlett-Packard Development Company
* All rights reserved.
*
- * Redistribution and use of this software in source and binary forms,
- * with or without modification, are permitted provided that the
- * following conditions are met:
+ * The license below extends only to copyright in the software and shall
+ * not be construed as granting a license to any other intellectual
+ * property including but not limited to intellectual property relating
+ * to a hardware implementation of the functionality of the software
+ * licensed hereunder. You may use the software subject to the license
+ * terms below provided that you ensure that this notice is replicated
+ * unmodified and in its entirety in all distributions of the software,
+ * modified or unmodified, in source code or in binary form.
*
- * The software must be used only for Non-Commercial Use which means any
- * use which is NOT directed to receiving any direct monetary
- * compensation for, or commercial advantage from such use. Illustrative
- * examples of non-commercial use are academic research, personal study,
- * teaching, education and corporate research & development.
- * Illustrative examples of commercial use are distributing products for
- * commercial advantage and providing services using the software for
- * commercial advantage.
- *
- * If you wish to use this software or functionality therein that may be
- * covered by patents for commercial use, please contact:
- * Director of Intellectual Property Licensing
- * Office of Strategy and Technology
- * Hewlett-Packard Company
- * 1501 Page Mill Road
- * Palo Alto, California 94304
- *
- * Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer. Redistributions
- * in binary form must reproduce the above copyright notice, this list of
- * conditions and the following disclaimer in the documentation and/or
- * other materials provided with the distribution. Neither the name of
- * the COPYRIGHT HOLDER(s), HEWLETT-PACKARD COMPANY, nor the names of its
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission. No right of
- * sublicense is granted herewith. Derivatives of the software and
- * output created using the software may be prepared, but only for
- * Non-Commercial Uses. Derivatives of the software may be shared with
- * others provided: (i) the others agree to abide by the list of
- * conditions herein which includes the Non-Commercial Use restrictions;
- * and (ii) such Derivatives of the software include the above copyright
- * notice to acknowledge the contribution from this software where
- * applicable, this list of conditions and the disclaimer below.
+ * this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
#include "arch/x86/pagetable.hh"
#include "arch/x86/tlb.hh"
+#include "base/fast_alloc.hh"
+#include "base/types.hh"
#include "mem/mem_object.hh"
#include "mem/packet.hh"
#include "params/X86PagetableWalker.hh"
-#include "sim/host.hh"
+#include "sim/faults.hh"
class ThreadContext;
{
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. 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.
- void doNext(PacketPtr &read, PacketPtr &write);
-
- // Kick off the state machine.
- void start(ThreadContext * _tc, Addr vaddr);
-
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;
-
- /*
- * 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;
- /*
- * State machine state.
- */
- ThreadContext * tc;
- State state;
- State nextState;
- int size;
- bool enableNX;
- TlbEntry entry;
+ // 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)
{
}
};
projects / gem5.git / blobdiff