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+/*
+ * Copyright (c) 2014 ARM Limited
+ * All rights reserved
+ *
+ * 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.
+ *
+ * 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.
+ *
+ * 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: Mitch Hayenga
+ */
+
+#ifndef __MEM_CACHE_PREFETCH_QUEUED_HH__
+#define __MEM_CACHE_PREFETCH_QUEUED_HH__
+
+#include <list>
+
+#include "mem/cache/prefetch/base.hh"
+#include "params/QueuedPrefetcher.hh"
+
+class QueuedPrefetcher : public BasePrefetcher
+{
+ protected:
+ struct DeferredPacket {
+ Tick tick;
+ PacketPtr pkt;
+ DeferredPacket(Tick t, PacketPtr p) : tick(t), pkt(p) {}
+ };
+
+ std::list<DeferredPacket> pfq;
+
+ // PARAMETERS
+
+ /** Maximum size of the prefetch queue */
+ const unsigned queueSize;
+
+ /** Cycles after generation when a prefetch can first be issued */
+ const Cycles latency;
+
+ /** Squash queued prefetch if demand access observed */
+ const bool queueSquash;
+
+ /** Filter prefetches if already queued */
+ const bool queueFilter;
+
+ /** Snoop the cache before generating prefetch (cheating basically) */
+ const bool cacheSnoop;
+
+ /** Tag prefetch with PC of generating access? */
+ const bool tagPrefetch;
+
+ bool inPrefetch(Addr address, bool is_secure) const;
+
+ // STATS
+ Stats::Scalar pfIdentified;
+ Stats::Scalar pfBufferHit;
+ Stats::Scalar pfInCache;
+ Stats::Scalar pfRemovedFull;
+ Stats::Scalar pfSpanPage;
+
+ public:
+ QueuedPrefetcher(const QueuedPrefetcherParams *p);
+ virtual ~QueuedPrefetcher();
+
+ Tick notify(const PacketPtr &pkt);
+
+ // Note: This should really be pure virtual, but doesnt go well with params
+ virtual void calculatePrefetch(const PacketPtr &pkt,
+ std::vector<Addr> &addresses) = 0;
+ PacketPtr getPacket();
+
+ Tick nextPrefetchReadyTime() const
+ {
+ return pfq.empty() ? MaxTick : pfq.front().tick;
+ }
+
+ void regStats();
+};
+
+#endif //__MEM_CACHE_PREFETCH_QUEUED_HH__
+