multi.cc

Go to the documentation of this file.

/*
 * Copyright (c) 2014, 2019 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.
 *
 * 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.
 */
 
#include "mem/cache/prefetch/multi.hh"
 
#include "params/MultiPrefetcher.hh"
 
namespace Prefetcher {
 
Multi::Multi(const MultiPrefetcherParams *p)
  : Base(p),
    prefetchers(p->prefetchers.begin(), p->prefetchers.end())
{
}
 
void
Multi::setCache(BaseCache *_cache)
{
    for (auto pf : prefetchers)
        pf->setCache(_cache);
}
 
Tick
Multi::nextPrefetchReadyTime() const
{
    Tick next_ready = MaxTick;
 
    for (auto pf : prefetchers)
        next_ready = std::min(next_ready, pf->nextPrefetchReadyTime());
 
    return next_ready;
}
 
PacketPtr
Multi::getPacket()
{
    for (auto pf : prefetchers) {
        if (pf->nextPrefetchReadyTime() <= curTick()) {
            PacketPtr pkt = pf->getPacket();
            panic_if(!pkt, "Prefetcher is ready but didn't return a packet.");
            return pkt;
        }
    }
 
    return nullptr;
}
 
} // namespace Prefetcher
 
Prefetcher::Multi*
MultiPrefetcherParams::create()
{
    return new Prefetcher::Multi(this);
}