X86: Separate out the page table walker into it's own cc and hh.

--HG--
extra : convert_revision : cbc3af01ca3dc911a59224a574007c5c0bcf6042

1 files changed, 189 insertions, 0 deletions

diff --git a/src/arch/x86/pagetable_walker.hh b/src/arch/x86/pagetable_walker.hh
new file mode 100644
index 000000000..324f16f3c
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+++ b/src/arch/x86/pagetable_walker.hh
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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__