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Diffstat (limited to 'src/mem/cache/cache_blk.hh')
-rw-r--r-- | src/mem/cache/cache_blk.hh | 274 |
1 files changed, 0 insertions, 274 deletions
diff --git a/src/mem/cache/cache_blk.hh b/src/mem/cache/cache_blk.hh deleted file mode 100644 index bafb46a89..000000000 --- a/src/mem/cache/cache_blk.hh +++ /dev/null @@ -1,274 +0,0 @@ -/* - * Copyright (c) 2003-2005 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: Erik Hallnor - */ - -/** @file - * Definitions of a simple cache block class. - */ - -#ifndef __CACHE_BLK_HH__ -#define __CACHE_BLK_HH__ - -#include <list> - -#include "base/printable.hh" -#include "sim/core.hh" // for Tick -#include "arch/isa_traits.hh" // for Addr -#include "mem/packet.hh" -#include "mem/request.hh" - -/** - * Cache block status bit assignments - */ -enum CacheBlkStatusBits { - /** valid, readable */ - BlkValid = 0x01, - /** write permission */ - BlkWritable = 0x02, - /** dirty (modified) */ - BlkDirty = 0x04, - /** block was referenced */ - BlkReferenced = 0x10, - /** block was a hardware prefetch yet unaccessed*/ - BlkHWPrefetched = 0x20 -}; - -/** - * A Basic Cache block. - * Contains the tag, status, and a pointer to data. - */ -class CacheBlk -{ - public: - /** The address space ID of this block. */ - int asid; - /** Data block tag value. */ - Addr tag; - /** - * Contains a copy of the data in this block for easy access. This is used - * for efficient execution when the data could be actually stored in - * another format (COW, compressed, sub-blocked, etc). In all cases the - * data stored here should be kept consistant with the actual data - * referenced by this block. - */ - uint8_t *data; - /** the number of bytes stored in this block. */ - int size; - - /** block state: OR of CacheBlkStatusBit */ - typedef unsigned State; - - /** The current status of this block. @sa CacheBlockStatusBits */ - State status; - - /** Which curTick will this block be accessable */ - Tick whenReady; - - /** - * The set this block belongs to. - * @todo Move this into subclasses when we fix CacheTags to use them. - */ - int set; - - /** Number of references to this block since it was brought in. */ - int refCount; - - protected: - /** - * Represents that the indicated thread context has a "lock" on - * the block, in the LL/SC sense. - */ - class Lock { - public: - int cpuNum; // locking CPU - int threadNum; // locking thread ID within CPU - - // check for matching execution context - bool matchesContext(Request *req) - { - return (cpuNum == req->getCpuNum() && - threadNum == req->getThreadNum()); - } - - Lock(Request *req) - : cpuNum(req->getCpuNum()), threadNum(req->getThreadNum()) - { - } - }; - - /** List of thread contexts that have performed a load-locked (LL) - * on the block since the last store. */ - std::list<Lock> lockList; - - public: - - CacheBlk() - : asid(-1), tag(0), data(0) ,size(0), status(0), whenReady(0), - set(-1), refCount(0) - {} - - /** - * Copy the state of the given block into this one. - * @param rhs The block to copy. - * @return a const reference to this block. - */ - const CacheBlk& operator=(const CacheBlk& rhs) - { - asid = rhs.asid; - tag = rhs.tag; - data = rhs.data; - size = rhs.size; - status = rhs.status; - whenReady = rhs.whenReady; - set = rhs.set; - refCount = rhs.refCount; - return *this; - } - - /** - * Checks the write permissions of this block. - * @return True if the block is writable. - */ - bool isWritable() const - { - const int needed_bits = BlkWritable | BlkValid; - return (status & needed_bits) == needed_bits; - } - - /** - * Checks that a block is valid (readable). - * @return True if the block is valid. - */ - bool isValid() const - { - return (status & BlkValid) != 0; - } - - /** - * Check to see if a block has been written. - * @return True if the block is dirty. - */ - bool isDirty() const - { - return (status & BlkDirty) != 0; - } - - /** - * Check if this block has been referenced. - * @return True if the block has been referenced. - */ - bool isReferenced() const - { - return (status & BlkReferenced) != 0; - } - - /** - * Check if this block was the result of a hardware prefetch, yet to - * be touched. - * @return True if the block was a hardware prefetch, unaccesed. - */ - bool isPrefetch() const - { - return (status & BlkHWPrefetched) != 0; - } - - /** - * Track the fact that a local locked was issued to the block. If - * multiple LLs get issued from the same context we could have - * redundant records on the list, but that's OK, as they'll all - * get blown away at the next store. - */ - void trackLoadLocked(PacketPtr pkt) - { - assert(pkt->isLocked()); - lockList.push_front(Lock(pkt->req)); - } - - /** - * Clear the list of valid load locks. Should be called whenever - * block is written to or invalidated. - */ - void clearLoadLocks() { lockList.clear(); } - - /** - * Handle interaction of load-locked operations and stores. - * @return True if write should proceed, false otherwise. Returns - * false only in the case of a failed store conditional. - */ - bool checkWrite(PacketPtr pkt) - { - Request *req = pkt->req; - if (pkt->isLocked()) { - // it's a store conditional... have to check for matching - // load locked. - bool success = false; - - for (std::list<Lock>::iterator i = lockList.begin(); - i != lockList.end(); ++i) - { - if (i->matchesContext(req)) { - // it's a store conditional, and as far as the memory - // system can tell, the requesting context's lock is - // still valid. - success = true; - break; - } - } - - req->setExtraData(success ? 1 : 0); - clearLoadLocks(); - return success; - } else { - // for *all* stores (conditional or otherwise) we have to - // clear the list of load-locks as they're all invalid now. - clearLoadLocks(); - return true; - } - } -}; - -/** - * Simple class to provide virtual print() method on cache blocks - * without allocating a vtable pointer for every single cache block. - * Just wrap the CacheBlk object in an instance of this before passing - * to a function that requires a Printable object. - */ -class CacheBlkPrintWrapper : public Printable -{ - CacheBlk *blk; - public: - CacheBlkPrintWrapper(CacheBlk *_blk) : blk(_blk) {} - virtual ~CacheBlkPrintWrapper() {} - void print(std::ostream &o, int verbosity = 0, - const std::string &prefix = "") const; -}; - - - -#endif //__CACHE_BLK_HH__ |