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/*
* Copyright (c) 1999-2008 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.
*/
/*
* CacheMemory.hh
*
* Description:
*
* $Id: CacheMemory.hh,v 3.7 2004/06/18 20:15:15 beckmann Exp $
*
*/
#ifndef CACHEMEMORY_H
#define CACHEMEMORY_H
#include "mem/ruby/common/Global.hh"
#include "mem/protocol/AccessPermission.hh"
#include "mem/ruby/common/Address.hh"
#include "mem/ruby/recorder/CacheRecorder.hh"
#include "mem/protocol/CacheRequestType.hh"
#include "mem/gems_common/Vector.hh"
#include "mem/ruby/common/DataBlock.hh"
#include "mem/protocol/MachineType.hh"
#include "mem/ruby/slicc_interface/RubySlicc_ComponentMapping.hh"
#include "mem/ruby/system/PseudoLRUPolicy.hh"
#include "mem/ruby/system/LRUPolicy.hh"
#include "mem/ruby/slicc_interface/AbstractCacheEntry.hh"
#include "mem/ruby/system/System.hh"
#include "mem/ruby/slicc_interface/AbstractController.hh"
#include "mem/ruby/profiler/CacheProfiler.hh"
#include "mem/protocol/CacheMsg.hh"
#include <vector>
class CacheMemory {
public:
// Constructors
CacheMemory(const string & name);
void init(const vector<string> & argv);
// Destructor
~CacheMemory();
// factory
// static CacheMemory* createCache(int level, int num, char split_type, AbstractCacheEntry* (*entry_factory)());
// static CacheMemory* getCache(int cache_id);
static int numberOfLastLevelCaches();
// Public Methods
void printConfig(ostream& out);
// perform a cache access and see if we hit or not. Return true on a hit.
bool tryCacheAccess(const Address& address, CacheRequestType type, DataBlock*& data_ptr);
// similar to above, but doesn't require full access check
bool testCacheAccess(const Address& address, CacheRequestType type, DataBlock*& data_ptr);
// tests to see if an address is present in the cache
bool isTagPresent(const Address& address) const;
// Returns true if there is:
// a) a tag match on this address or there is
// b) an unused line in the same cache "way"
bool cacheAvail(const Address& address) const;
// find an unused entry and sets the tag appropriate for the address
void allocate(const Address& address, AbstractCacheEntry* new_entry);
// Explicitly free up this address
void deallocate(const Address& address);
// Returns with the physical address of the conflicting cache line
Address cacheProbe(const Address& address) const;
// looks an address up in the cache
AbstractCacheEntry& lookup(const Address& address);
const AbstractCacheEntry& lookup(const Address& address) const;
// Get/Set permission of cache block
AccessPermission getPermission(const Address& address) const;
void changePermission(const Address& address, AccessPermission new_perm);
int getLatency() const { return m_latency; }
// Hook for checkpointing the contents of the cache
void recordCacheContents(CacheRecorder& tr) const;
void setAsInstructionCache(bool is_icache) { m_is_instruction_only_cache = is_icache; }
// Set this address to most recently used
void setMRU(const Address& address);
void profileMiss(const CacheMsg & msg);
void getMemoryValue(const Address& addr, char* value,
unsigned int size_in_bytes );
void setMemoryValue(const Address& addr, char* value,
unsigned int size_in_bytes );
void setLocked (const Address& addr, int context);
void clearLocked (const Address& addr);
bool isLocked (const Address& addr, int context);
// Print cache contents
void print(ostream& out) const;
void printData(ostream& out) const;
void clearStats() const;
void printStats(ostream& out) const;
private:
// Private Methods
// convert a Address to its location in the cache
Index addressToCacheSet(const Address& address) const;
// Given a cache tag: returns the index of the tag in a set.
// returns -1 if the tag is not found.
int findTagInSet(Index line, const Address& tag) const;
int findTagInSetIgnorePermissions(Index cacheSet, const Address& tag) const;
// Private copy constructor and assignment operator
CacheMemory(const CacheMemory& obj);
CacheMemory& operator=(const CacheMemory& obj);
private:
const string m_cache_name;
AbstractController* m_controller;
int m_latency;
// Data Members (m_prefix)
bool m_is_instruction_only_cache;
bool m_is_data_only_cache;
// The first index is the # of cache lines.
// The second index is the the amount associativity.
Vector<Vector<AbstractCacheEntry*> > m_cache;
Vector<Vector<int> > m_locked;
AbstractReplacementPolicy *m_replacementPolicy_ptr;
CacheProfiler* m_profiler_ptr;
int m_cache_num_sets;
int m_cache_num_set_bits;
int m_cache_assoc;
static int m_num_last_level_caches;
static MachineType m_last_level_machine_type;
static Vector< CacheMemory* > m_all_caches;
};
#endif //CACHEMEMORY_H
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