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/*
* Copyright (c) 2013-2014 ARM Limited
* All rights reserved.
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Copyright (c) 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: Ron Dreslinski
* Mitch Hayenga
*/
/**
* @file
* Hardware Prefetcher Definition.
*/
#include <list>
#include "mem/cache/prefetch/base.hh"
#include "mem/cache/base.hh"
#include "sim/system.hh"
BasePrefetcher::BasePrefetcher(const BasePrefetcherParams *p)
: ClockedObject(p), cache(nullptr), blkSize(0), system(p->sys),
onMiss(p->on_miss), onRead(p->on_read),
onWrite(p->on_write), onData(p->on_data), onInst(p->on_inst),
masterId(system->getMasterId(name())),
pageBytes(system->getPageBytes())
{
}
void
BasePrefetcher::setCache(BaseCache *_cache)
{
assert(!cache);
cache = _cache;
blkSize = cache->getBlockSize();
}
void
BasePrefetcher::regStats()
{
pfIssued
.name(name() + ".num_hwpf_issued")
.desc("number of hwpf issued")
;
}
bool
BasePrefetcher::observeAccess(const PacketPtr &pkt) const
{
Addr addr = pkt->getAddr();
bool fetch = pkt->req->isInstFetch();
bool read = pkt->isRead();
bool inv = pkt->isInvalidate();
bool is_secure = pkt->isSecure();
if (pkt->req->isUncacheable()) return false;
if (fetch && !onInst) return false;
if (!fetch && !onData) return false;
if (!fetch && read && !onRead) return false;
if (!fetch && !read && !onWrite) return false;
if (!fetch && !read && inv) return false;
if (pkt->cmd == MemCmd::CleanEvict) return false;
if (onMiss) {
return !inCache(addr, is_secure) &&
!inMissQueue(addr, is_secure);
}
return true;
}
bool
BasePrefetcher::inCache(Addr addr, bool is_secure) const
{
if (cache->inCache(addr, is_secure)) {
return true;
}
return false;
}
bool
BasePrefetcher::inMissQueue(Addr addr, bool is_secure) const
{
if (cache->inMissQueue(addr, is_secure)) {
return true;
}
return false;
}
bool
BasePrefetcher::samePage(Addr a, Addr b) const
{
return roundDown(a, pageBytes) == roundDown(b, pageBytes);
}
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