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/*
* Copyright (c) 1999-2012 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_CACHEMEMORY_HH__
#define __MEM_RUBY_SYSTEM_CACHEMEMORY_HH__
#include <string>
#include <vector>
#include "base/hashmap.hh"
#include "base/statistics.hh"
#include "mem/protocol/CacheResourceType.hh"
#include "mem/protocol/CacheRequestType.hh"
#include "mem/protocol/GenericRequestType.hh"
#include "mem/protocol/RubyRequest.hh"
#include "mem/ruby/common/DataBlock.hh"
#include "mem/ruby/profiler/CacheProfiler.hh"
#include "mem/ruby/recorder/CacheRecorder.hh"
#include "mem/ruby/slicc_interface/AbstractCacheEntry.hh"
#include "mem/ruby/slicc_interface/RubySlicc_ComponentMapping.hh"
#include "mem/ruby/system/BankedArray.hh"
#include "mem/ruby/system/LRUPolicy.hh"
#include "mem/ruby/system/PseudoLRUPolicy.hh"
#include "params/RubyCache.hh"
#include "sim/sim_object.hh"
class CacheMemory : public SimObject
{
public:
typedef RubyCacheParams Params;
CacheMemory(const Params *p);
~CacheMemory();
void init();
// Public Methods
// perform a cache access and see if we hit or not. Return true on a hit.
bool tryCacheAccess(const Address& address, RubyRequestType type,
DataBlock*& data_ptr);
// similar to above, but doesn't require full access check
bool testCacheAccess(const Address& address, RubyRequestType 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
AbstractCacheEntry* allocate(const Address& address, AbstractCacheEntry* new_entry);
void allocateVoid(const Address& address, AbstractCacheEntry* new_entry)
{
allocate(address, 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;
int getLatency() const { return m_latency; }
// Hook for checkpointing the contents of the cache
void recordCacheContents(int cntrl, CacheRecorder* tr) const;
// Set this address to most recently used
void setMRU(const Address& address);
void profileMiss(const RubyRequest & msg);
void profileGenericRequest(GenericRequestType requestType,
RubyAccessMode accessType,
PrefetchBit pfBit);
void setLocked (const Address& addr, int context);
void clearLocked (const Address& addr);
bool isLocked (const Address& addr, int context);
// Print cache contents
void print(std::ostream& out) const;
void printData(std::ostream& out) const;
void clearStats() const;
void printStats(std::ostream& out) const;
void recordRequestType(CacheRequestType requestType);
void regStats();
Stats::Scalar numDataArrayReads;
Stats::Scalar numDataArrayWrites;
Stats::Scalar numTagArrayReads;
Stats::Scalar numTagArrayWrites;
bool checkResourceAvailable(CacheResourceType res, Address addr);
Stats::Scalar numTagArrayStalls;
Stats::Scalar numDataArrayStalls;
private:
// 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 std::string m_cache_name;
int m_latency;
// Data Members (m_prefix)
bool m_is_instruction_only_cache;
// The first index is the # of cache lines.
// The second index is the the amount associativity.
m5::hash_map<Address, int> m_tag_index;
std::vector<std::vector<AbstractCacheEntry*> > m_cache;
AbstractReplacementPolicy *m_replacementPolicy_ptr;
CacheProfiler* m_profiler_ptr;
BankedArray dataArray;
BankedArray tagArray;
int m_cache_size;
std::string m_policy;
int m_cache_num_sets;
int m_cache_num_set_bits;
int m_cache_assoc;
int m_start_index_bit;
bool m_resource_stalls;
};
#endif // __MEM_RUBY_SYSTEM_CACHEMEMORY_HH__
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