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-/*
- * Copyright (c) 2003-2005 The Regents of The University of Michigan
- * All rights reserved.
- *
- * 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: Erik Hallnor
- * Ron Dreslinski
- */
-
-/**
- * @file
- * Declaration of a simple coherence policy.
- */
-
-#ifndef __SIMPLE_COHERENCE_HH__
-#define __SIMPLE_COHERENCE_HH__
-
-#include <string>
-
-#include "mem/packet.hh"
-#include "mem/cache/cache_blk.hh"
-#include "mem/cache/miss/mshr_queue.hh"
-#include "mem/cache/coherence/coherence_protocol.hh"
-
-class BaseCache;
-
-/**
- * A simple MP coherence policy. This policy assumes an atomic bus and only one
- * level of cache.
- */
-class SimpleCoherence
-{
- protected:
- /** Pointer to the parent cache. */
- BaseCache *cache;
- /** Pointer to the coherence protocol. */
- CoherenceProtocol *protocol;
-
- public:
- /**
- * Construct and initialize this coherence policy.
- * @param _protocol The coherence protocol to use.
- */
- SimpleCoherence(CoherenceProtocol *_protocol)
- : protocol(_protocol)
- {
- }
-
- /**
- * Set the pointer to the parent cache.
- * @param _cache The parent cache.
- */
- void setCache(BaseCache *_cache)
- {
- cache = _cache;
- }
-
- /**
- * Register statistics.
- * @param name The name to prepend to stat descriptions.
- */
- void regStats(const std::string &name)
- {
- }
-
- /**
- * This policy does not forward invalidates, return NULL.
- * @return NULL.
- */
- PacketPtr getPacket()
- {
- return NULL;
- }
-
- /**
- * Return the proper state given the current state and the bus response.
- * @param pkt The bus response.
- * @param current The current block state.
- * @return The new state.
- */
- CacheBlk::State getNewState(PacketPtr pkt,
- CacheBlk::State current = 0)
- {
- return protocol->getNewState(pkt, current);
- }
-
- /**
- * Handle snooped bus requests.
- * @param pkt The snooped bus request.
- * @param blk The cache block corresponding to the request, if any.
- * @param mshr The MSHR corresponding to the request, if any.
- * @param new_state Return the new state for the block.
- */
- bool handleBusRequest(PacketPtr &pkt, CacheBlk *blk, MSHR *mshr,
- CacheBlk::State &new_state)
- {
-// assert(mshr == NULL);
-//Got rid of, there could be an MSHR, but it can't be in service
- if (blk != NULL)
- {
- if (pkt->cmd != MemCmd::Writeback) {
- return protocol->handleBusRequest(cache, pkt, blk, mshr,
- new_state);
- }
- else { //It is a writeback, must be ownership protocol, just keep state
- new_state = blk->status;
- }
- }
- return false;
- }
-
- /**
- * Get the proper bus command for the given command and status.
- * @param cmd The request's command.
- * @param state The current state of the cache block.
- * @return The proper bus command, as determined by the protocol.
- */
- MemCmd getBusCmd(MemCmd cmd,
- CacheBlk::State state)
- {
- if (cmd == MemCmd::Writeback) return MemCmd::Writeback;
- return protocol->getBusCmd(cmd, state);
- }
-
- /**
- * Return true if this coherence policy can handle fast cache writes.
- */
- bool allowFastWrites() { return false; }
-
- bool hasProtocol() { return true; }
-};
-
-#endif //__SIMPLE_COHERENCE_HH__
-
-
-
-
-
-
-
-