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-/*
- * Copyright (c) 2004-2005 The Regents of The University of Michigan
- * 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.
- *
- * Authors: Lisa Hsu
- */
-
-/**
- * @file
- * Declaration of a LRU tag store for a partitioned cache.
- */
-
-#ifndef __SPLIT_LRU_HH__
-#define __SPLIT_LRU_HH__
-
-#include <cstring>
-#include <list>
-
-#include "mem/cache/blk.hh" // base class
-#include "mem/cache/tags/split_blk.hh"
-#include "mem/packet.hh" // for inlined functions
-#include <assert.h>
-#include "mem/cache/tags/base.hh"
-
-class BaseCache;
-
-/**
- * An associative set of cache blocks.
- */
-
-class SplitCacheSet
-{
- public:
- /** The associativity of this set. */
- int assoc;
-
- /** Cache blocks in this set, maintained in LRU order 0 = MRU. */
- SplitBlk **blks;
-
- /**
- * Find a block matching the tag in this set.
- * @param asid The address space ID.
- * @param tag The Tag to find.
- * @return Pointer to the block if found.
- */
- SplitBlk* findBlk(Addr tag) const;
-
- /**
- * Move the given block to the head of the list.
- * @param blk The block to move.
- */
- void moveToHead(SplitBlk *blk);
-};
-
-/**
- * A LRU cache tag store.
- */
-class SplitLRU : public BaseTags
-{
- public:
- /** Typedef the block type used in this tag store. */
- typedef SplitBlk BlkType;
- /** Typedef for a list of pointers to the local block class. */
- typedef std::list<SplitBlk*> BlkList;
- protected:
- /** The number of sets in the cache. */
- const int numSets;
- /** The number of bytes in a block. */
- const int blkSize;
- /** The associativity of the cache. */
- const int assoc;
- /** The hit latency. */
- const int hitLatency;
- /** indicator for which partition this is */
- const int part;
-
- /** The cache sets. */
- SplitCacheSet *sets;
-
- /** The cache blocks. */
- SplitBlk *blks;
- /** The data blocks, 1 per cache block. */
- uint8_t *dataBlks;
-
- /** The amount to shift the address to get the set. */
- int setShift;
- /** The amount to shift the address to get the tag. */
- int tagShift;
- /** Mask out all bits that aren't part of the set index. */
- unsigned setMask;
- /** Mask out all bits that aren't part of the block offset. */
- unsigned blkMask;
-
- /** number of hits in this partition */
- Stats::Scalar<> hits;
- /** number of blocks brought into this partition (i.e. misses) */
- Stats::Scalar<> misses;
-
-public:
- /**
- * Construct and initialize this tag store.
- * @param _numSets The number of sets in the cache.
- * @param _blkSize The number of bytes in a block.
- * @param _assoc The associativity of the cache.
- * @param _hit_latency The latency in cycles for a hit.
- */
- SplitLRU(int _numSets, int _blkSize, int _assoc, int _hit_latency, int _part);
-
- /**
- * Destructor
- */
- virtual ~SplitLRU();
-
- /**
- * Register the statistics for this object
- * @param name The name to precede the stat
- */
- void regStats(const std::string &name);
-
- /**
- * Return the block size.
- * @return the block size.
- */
- int getBlockSize()
- {
- return blkSize;
- }
-
- /**
- * Return the subblock size. In the case of LRU it is always the block
- * size.
- * @return The block size.
- */
- int getSubBlockSize()
- {
- return blkSize;
- }
-
- /**
- * Search for the address in the cache.
- * @param asid The address space ID.
- * @param addr The address to find.
- * @return True if the address is in the cache.
- */
- bool probe(Addr addr) const;
-
- /**
- * Invalidate the given block.
- * @param blk The block to invalidate.
- */
- void invalidateBlk(BlkType *blk);
-
- /**
- * Finds the given address in the cache and update replacement data.
- * Returns the access latency as a side effect.
- * @param addr The address to find.
- * @param asid The address space ID.
- * @param lat The access latency.
- * @return Pointer to the cache block if found.
- */
- SplitBlk* findBlock(Addr addr, int &lat);
-
- /**
- * Finds the given address in the cache, do not update replacement data.
- * @param addr The address to find.
- * @param asid The address space ID.
- * @return Pointer to the cache block if found.
- */
- SplitBlk* findBlock(Addr addr) const;
-
- /**
- * Find a replacement block for the address provided.
- * @param pkt The request to a find a replacement candidate for.
- * @param writebacks List for any writebacks to be performed.
- * @return The block to place the replacement in.
- */
- SplitBlk* findReplacement(Addr addr, PacketList &writebacks);
-
- /**
- * Generate the tag from the given address.
- * @param addr The address to get the tag from.
- * @return The tag of the address.
- */
- Addr extractTag(Addr addr) const
- {
- return (addr >> tagShift);
- }
-
- /**
- * Calculate the set index from the address.
- * @param addr The address to get the set from.
- * @return The set index of the address.
- */
- int extractSet(Addr addr) const
- {
- return ((addr >> setShift) & setMask);
- }
-
- /**
- * Get the block offset from an address.
- * @param addr The address to get the offset of.
- * @return The block offset.
- */
- int extractBlkOffset(Addr addr) const
- {
- return (addr & blkMask);
- }
-
- /**
- * Align an address to the block size.
- * @param addr the address to align.
- * @return The block address.
- */
- Addr blkAlign(Addr addr) const
- {
- return (addr & ~(Addr)blkMask);
- }
-
- /**
- * Regenerate the block address from the tag.
- * @param tag The tag of the block.
- * @param set The set of the block.
- * @return The block address.
- */
- Addr regenerateBlkAddr(Addr tag, unsigned set) const
- {
- return ((tag << tagShift) | ((Addr)set << setShift));
- }
-
- /**
- * Return the hit latency.
- * @return the hit latency.
- */
- int getHitLatency() const
- {
- return hitLatency;
- }
-
- /**
- * Read the data out of the internal storage of the given cache block.
- * @param blk The cache block to read.
- * @param data The buffer to read the data into.
- * @return The cache block's data.
- */
- void readData(SplitBlk *blk, uint8_t *data)
- {
- std::memcpy(data, blk->data, blk->size);
- }
-
- /**
- * Write data into the internal storage of the given cache block. Since in
- * LRU does not store data differently this just needs to update the size.
- * @param blk The cache block to write.
- * @param data The data to write.
- * @param size The number of bytes to write.
- * @param writebacks A list for any writebacks to be performed. May be
- * needed when writing to a compressed block.
- */
- void writeData(SplitBlk *blk, uint8_t *data, int size,
- PacketList & writebacks)
- {
- assert(size <= blkSize);
- blk->size = size;
- }
-
- /**
- * Called at end of simulation to complete average block reference stats.
- */
- virtual void cleanupRefs();
-};
-
-#endif
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