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/*
* Copyright (c) 2007 Mark D. Hill and David A. Wood
* 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_RUBY_SYSTEM_LRUPOLICY_HH__
#define __MEM_RUBY_SYSTEM_LRUPOLICY_HH__
#include "mem/ruby/system/AbstractReplacementPolicy.hh"
/* Simple true LRU replacement policy */
class LRUPolicy : public AbstractReplacementPolicy
{
public:
LRUPolicy(Index num_sets, Index assoc);
~LRUPolicy();
void touch(Index set, Index way, Tick time);
Index getVictim(Index set) const;
};
inline
LRUPolicy::LRUPolicy(Index num_sets, Index assoc)
: AbstractReplacementPolicy(num_sets, assoc)
{
}
inline
LRUPolicy::~LRUPolicy()
{
}
inline void
LRUPolicy::touch(Index set, Index index, Tick time)
{
assert(index >= 0 && index < m_assoc);
assert(set >= 0 && set < m_num_sets);
m_last_ref_ptr[set][index] = time;
}
inline Index
LRUPolicy::getVictim(Index set) const
{
// assert(m_assoc != 0);
Tick time, smallest_time;
Index smallest_index;
smallest_index = 0;
smallest_time = m_last_ref_ptr[set][0];
for (unsigned i = 0; i < m_assoc; i++) {
time = m_last_ref_ptr[set][i];
// assert(m_cache[cacheSet][i].m_Permission !=
// AccessPermission_NotPresent);
if (time < smallest_time) {
smallest_index = i;
smallest_time = time;
}
}
// DEBUG_EXPR(CACHE_COMP, MedPrio, cacheSet);
// DEBUG_EXPR(CACHE_COMP, MedPrio, smallest_index);
// DEBUG_EXPR(CACHE_COMP, MedPrio, m_cache[cacheSet][smallest_index]);
// DEBUG_EXPR(CACHE_COMP, MedPrio, *this);
return smallest_index;
}
#endif // __MEM_RUBY_SYSTEM_LRUPOLICY_HH__
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