skewed_associative.hh

Go to the documentation of this file.

/*
 * Copyright (c) 2018 Inria
 * 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.
 */
 
#ifndef __MEM_CACHE_INDEXING_POLICIES_SKEWED_ASSOCIATIVE_HH__
#define __MEM_CACHE_INDEXING_POLICIES_SKEWED_ASSOCIATIVE_HH__
 
#include <vector>
 
#include "mem/cache/tags/indexing_policies/base.hh"
#include "params/SkewedAssociative.hh"
 
namespace gem5
{
 
class ReplaceableEntry;
 
class SkewedAssociative : public BaseIndexingPolicy
{
  private:
    const int NUM_SKEWING_FUNCTIONS = 8;
 
    const int msbShift;
 
    Addr hash(const Addr addr) const;
 
    Addr dehash(const Addr addr) const;
 
    Addr skew(const Addr addr, const uint32_t way) const;
 
    Addr deskew(const Addr addr, const uint32_t way) const;
 
    uint32_t extractSet(const Addr addr, const uint32_t way) const;
 
  public:
     typedef SkewedAssociativeParams Params;
 
    SkewedAssociative(const Params &p);
 
    ~SkewedAssociative() {};
 
    std::vector<ReplaceableEntry*> getPossibleEntries(const Addr &addr) const
                                                                   override;
 
    Addr regenerateAddr(const Addr &tag,
                        const ReplaceableEntry* entry) const override;
};
class SkewedAssociative : public BaseIndexingPolicy {…};
 
} // namespace gem5
 
#endif //__MEM_CACHE_INDEXING_POLICIES_SKEWED_ASSOCIATIVE_HH__