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/*
* Copyright (c) 2012 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) 2001-2005 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
*/
/**
* @file
* SimpleMemory declaration
*/
#ifndef __SIMPLE_MEMORY_HH__
#define __SIMPLE_MEMORY_HH__
#include "mem/abstract_mem.hh"
#include "mem/tport.hh"
#include "params/SimpleMemory.hh"
/**
* The simple memory is a basic single-ported memory controller with
* an configurable throughput and latency, potentially with a variance
* added to the latter. It uses a QueueSlavePort to avoid dealing with
* the flow control of sending responses.
* @sa \ref gem5MemorySystem "gem5 Memory System"
*/
class SimpleMemory : public AbstractMemory
{
private:
class MemoryPort : public QueuedSlavePort
{
private:
/// Queue holding the response packets
SlavePacketQueue queueImpl;
SimpleMemory& memory;
public:
MemoryPort(const std::string& _name, SimpleMemory& _memory);
protected:
Tick recvAtomic(PacketPtr pkt);
void recvFunctional(PacketPtr pkt);
bool recvTimingReq(PacketPtr pkt);
AddrRangeList getAddrRanges() const;
};
MemoryPort port;
Tick lat;
Tick lat_var;
/// Bandwidth in ticks per byte
const double bandwidth;
/**
* Track the state of the memory as either idle or busy, no need
* for an enum with only two states.
*/
bool isBusy;
/**
* Remember if we have to retry an outstanding request that
* arrived while we were busy.
*/
bool retryReq;
/**
* Release the memory after being busy and send a retry if a
* request was rejected in the meanwhile.
*/
void release();
EventWrapper<SimpleMemory, &SimpleMemory::release> releaseEvent;
/** @todo this is a temporary workaround until the 4-phase code is
* committed. upstream caches needs this packet until true is returned, so
* hold onto it for deletion until a subsequent call
*/
std::vector<PacketPtr> pendingDelete;
public:
SimpleMemory(const SimpleMemoryParams *p);
virtual ~SimpleMemory() { }
unsigned int drain(DrainManager *dm);
virtual BaseSlavePort& getSlavePort(const std::string& if_name,
PortID idx = InvalidPortID);
virtual void init();
protected:
Tick doAtomicAccess(PacketPtr pkt);
void doFunctionalAccess(PacketPtr pkt);
bool recvTimingReq(PacketPtr pkt);
Tick calculateLatency(PacketPtr pkt);
};
#endif //__SIMPLE_MEMORY_HH__
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