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Diffstat (limited to 'src/mem/cache/tags/split_lifo.hh')
| -rw-r--r-- | src/mem/cache/tags/split_lifo.hh | 350 |
1 files changed, 350 insertions, 0 deletions
diff --git a/src/mem/cache/tags/split_lifo.hh b/src/mem/cache/tags/split_lifo.hh new file mode 100644 index 000000000..c50eaa53d --- /dev/null +++ b/src/mem/cache/tags/split_lifo.hh @@ -0,0 +1,350 @@ +/* + * 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 LIFO tag store usable in a partitioned cache. + */ + +#ifndef __SPLIT_LIFO_HH__ +#define __SPLIT_LIFO_HH__ + +#include <list> + +#include "mem/cache/cache_blk.hh" // base class +#include "mem/cache/tags/split_blk.hh" +#include "mem/packet.hh" // for inlined functions +#include "base/hashmap.hh" +#include <assert.h> +#include "mem/cache/tags/base_tags.hh" + +class BaseCache; + +/** + * A LIFO set of cache blks + */ +class LIFOSet { + public: + /** the number of blocks in this set */ + int ways; + + /** Cache blocks in this set, maintained in LIFO order where + 0 = Last in (head) */ + SplitBlk *lastIn; + SplitBlk *firstIn; + + /** has the initial "filling" of this set finished? i.e., have you had + * 'ways' number of compulsory misses in this set yet? if withValue == ways, + * then yes. withValue is meant to be the number of blocks in the set that have + * gone through their first compulsory miss. + */ + int withValue; + + /** + * Find a block matching the tag in this set. + * @param asid The address space ID. + * @param tag the Tag you are looking for + * @return Pointer to the block, if found, NULL otherwise + */ + SplitBlk* findBlk(int asid, Addr tag) const; + + void moveToLastIn(SplitBlk *blk); + void moveToFirstIn(SplitBlk *blk); + + LIFOSet() + : ways(-1), lastIn(NULL), firstIn(NULL), withValue(0) + {} +}; + +/** + * A LIFO cache tag store. + */ +class SplitLIFO : 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 bytes in a block. */ + const int blkSize; + /** the size of the cache in bytes */ + const int size; + /** the number of blocks in the cache */ + const int numBlks; + /** the number of sets in the cache */ + const int numSets; + /** the number of ways in the cache */ + const int ways; + /** The hit latency. */ + const int hitLatency; + /** whether this is a "2 queue" replacement @sa moveToLastIn @sa moveToFirstIn */ + const bool twoQueue; + /** indicator for which partition this is */ + const int part; + + /** The cache blocks. */ + SplitBlk *blks; + /** The Cache sets */ + LIFOSet *sets; + /** 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; + + + /** the number of hit in this partition */ + Stats::Scalar<> hits; + /** the number of blocks brought into this partition (i.e. misses) */ + Stats::Scalar<> misses; + /** the number of invalidations in this partition */ + Stats::Scalar<> invalidations; + +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. + */ + SplitLIFO(int _blkSize, int _size, int _ways, int _hit_latency, bool twoQueue, int _part); + + /** + * Destructor + */ + virtual ~SplitLIFO(); + + /** + * 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 LIFO 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(int asid, Addr addr) const; + + /** + * Invalidate the block containing the given address. + * @param asid The address space ID. + * @param addr The address to invalidate. + */ + void invalidateBlk(int asid, Addr addr); + + /** + * 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 asid, int &lat); + + /** + * Finds the given address in the cache and update replacement data. + * Returns the access latency as a side effect. + * @param req The req whose block to find + * @param lat The access latency. + * @return Pointer to the cache block if found. + */ + SplitBlk* findBlock(Packet * &pkt, 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, int asid) const; + + /** + * Find a replacement block for the address provided. + * @param req The request to a find a replacement candidate for. + * @param writebacks List for any writebacks to be performed. + * @param compress_blocks List of blocks to compress, for adaptive comp. + * @return The block to place the replacement in. + */ + SplitBlk* findReplacement(Packet * &pkt, PacketList* &writebacks, + BlkList &compress_blocks); + + /** + * 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); + } + + /** + * Generate the tag from the given address. + * @param addr The address to get the tag from. + * @param blk Ignored + * @return The tag of the address. + */ + Addr extractTag(Addr addr, SplitBlk *blk) 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) + { + memcpy(data, blk->data, blk->size); + } + + /** + * Write data into the internal storage of the given cache block. Since in + * LIFO 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; + } + + /** + * Perform a block aligned copy from the source address to the destination. + * @param source The block-aligned source address. + * @param dest The block-aligned destination address. + * @param asid The address space DI. + * @param writebacks List for any generated writeback requests. + */ + void doCopy(Addr source, Addr dest, int asid, PacketList* &writebacks); + + /** + * No impl. + */ + void fixCopy(Packet * &pkt, PacketList* &writebacks) + { + } + + /** + * Called at end of simulation to complete average block reference stats. + */ + virtual void cleanupRefs(); +}; + +#endif |