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/*
* Copyright (c) 2011-2012,2015,2017 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) 2002-2005 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
* Andreas Hansson
* William Wang
*/
#ifndef __MEM_GEM5_PROTOCOL_ATOMIC_HH__
#define __MEM_GEM5_PROTOCOL_ATOMIC_HH__
#include "mem/backdoor.hh"
#include "mem/packet.hh"
class AtomicResponseProtocol;
class AtomicRequestProtocol
{
friend class AtomicResponseProtocol;
protected:
/**
* Send an atomic request packet, where the data is moved and the
* state is updated in zero time, without interleaving with other
* memory accesses.
*
* @param peer Peer to send packet to.
* @param pkt Packet to send.
*
* @return Estimated latency of access.
*/
Tick send(AtomicResponseProtocol *peer, PacketPtr pkt);
/**
* Send an atomic request packet like above, but also request a backdoor
* to the data being accessed.
*
* @param peer Peer to send packet to.
* @param pkt Packet to send.
* @param backdoor Can be set to a back door pointer by the target to let
* caller have direct access to the requested data.
*
* @return Estimated latency of access.
*/
Tick sendBackdoor(AtomicResponseProtocol *peer, PacketPtr pkt,
MemBackdoorPtr &backdoor);
/**
* Receive an atomic snoop request packet from our peer.
*/
virtual Tick recvAtomicSnoop(PacketPtr pkt) = 0;
};
class AtomicResponseProtocol
{
friend class AtomicRequestProtocol;
protected:
/**
* Send an atomic snoop request packet, where the data is moved
* and the state is updated in zero time, without interleaving
* with other memory accesses.
*
* @param peer Peer to send packet to.
* @param pkt Snoop packet to send.
*
* @return Estimated latency of access.
*/
Tick sendSnoop(AtomicRequestProtocol *peer, PacketPtr pkt);
/**
* Receive an atomic request packet from the peer.
*/
virtual Tick recvAtomic(PacketPtr pkt) = 0;
/**
* Receive an atomic request packet from the peer, and optionally
* provide a backdoor to the data being accessed.
*/
virtual Tick recvAtomicBackdoor(
PacketPtr pkt, MemBackdoorPtr &backdoor) = 0;
};
#endif //__MEM_GEM5_PROTOCOL_ATOMIC_HH__
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