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+/*
+ * 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 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
+ * 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 IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Gabe Black
+ */
+
+#ifndef __ARCH_X86_PAGE_TABLE_WALKER_HH__
+#define __ARCH_X86_PAGE_TABLE_WALKER_HH__
+
+#include <vector>
+
+#include "arch/x86/pagetable.hh"
+#include "arch/x86/tlb.hh"
+#include "mem/mem_object.hh"
+#include "mem/packet.hh"
+#include "params/X86PagetableWalker.hh"
+#include "sim/host.hh"
+
+class ThreadContext;
+
+namespace X86ISA
+{
+ 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
+ */
+ class WalkerPort : public Port
+ {
+ public:
+ WalkerPort(const std::string &_name, Walker * _walker) :
+ Port(_name, _walker), walker(_walker),
+ snoopRangeSent(false)
+ {}
+
+ protected:
+ Walker * walker;
+
+ bool snoopRangeSent;
+
+ bool recvTiming(PacketPtr pkt);
+ Tick recvAtomic(PacketPtr pkt);
+ void recvFunctional(PacketPtr pkt);
+ void recvStatusChange(Status status);
+ void recvRetry();
+ void getDeviceAddressRanges(AddrRangeList &resp,
+ bool &snoop)
+ {
+ resp.clear();
+ snoop = true;
+ }
+ };
+
+ Port *getPort(const std::string &if_name, int idx = -1);
+
+ friend class WalkerPort;
+
+ WalkerPort port;
+
+ // 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;
+
+ public:
+
+ void setTLB(TLB * _tlb)
+ {
+ tlb = _tlb;
+ }
+
+ 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)
+ {
+ }
+ };
+}
+#endif // __ARCH_X86_PAGE_TABLE_WALKER_HH__