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/*
* Copyright (c) 2009 Advanced Micro Devices, Inc.
* Copyright (c) 2012 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_SPARSEMEMORY_HH__
#define __MEM_RUBY_SYSTEM_SPARSEMEMORY_HH__
#include <iostream>
#include <string>
#include "base/hashmap.hh"
#include "base/statistics.hh"
#include "mem/ruby/common/Address.hh"
#include "mem/ruby/slicc_interface/AbstractEntry.hh"
#include "mem/ruby/system/CacheRecorder.hh"
typedef void* SparseMemEntry;
typedef m5::hash_map<Address, SparseMemEntry> SparseMapType;
struct CurNextInfo
{
SparseMapType* curTable;
int level;
int highBit;
int lowBit;
};
class SparseMemory
{
public:
SparseMemory(int number_of_levels);
~SparseMemory();
bool exist(const Address& address) const;
void add(const Address& address, AbstractEntry*);
void remove(const Address& address);
/*!
* Function for recording the contents of memory. This function walks
* through all the levels of the sparse memory in a breadth first
* fashion. This might need more memory than a depth first approach.
* But breadth first seems easier to me than a depth first approach.
*/
void recordBlocks(int cntrl_id, CacheRecorder *) const;
AbstractEntry* lookup(const Address& address);
void regStats(const std::string &name);
private:
// Private copy constructor and assignment operator
SparseMemory(const SparseMemory& obj);
SparseMemory& operator=(const SparseMemory& obj);
// Used by destructor to recursively remove all tables
void recursivelyRemoveTables(SparseMapType* currentTable, int level);
// recursive search for address and remove associated entries
int recursivelyRemoveLevels(const Address& address, CurNextInfo& curInfo);
// Data Members (m_prefix)
SparseMapType* m_map_head;
int m_total_number_of_bits;
int m_number_of_levels;
int* m_number_of_bits_per_level;
Stats::Scalar m_total_adds;
Stats::Vector m_adds_per_level;
Stats::Scalar m_total_removes;
Stats::Vector m_removes_per_level;
};
#endif // __MEM_RUBY_SYSTEM_SPARSEMEMORY_HH__
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