102 lines
3.9 KiB
C++
102 lines
3.9 KiB
C++
|
/*
|
||
|
* 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.
|
||
|
*
|
||
|
* 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: Andreas Hansson
|
||
|
*/
|
||
|
|
||
|
#ifndef __MEM_QPORT_HH__
|
||
|
#define __MEM_QPORT_HH__
|
||
|
|
||
|
/**
|
||
|
* @file
|
||
|
* Declaration of the queued port.
|
||
|
*/
|
||
|
|
||
|
#include "mem/packet_queue.hh"
|
||
|
#include "mem/port.hh"
|
||
|
|
||
|
/**
|
||
|
* A queued port is a port that has an infinite queue for outgoing
|
||
|
* packets and thus decouples the module that wants to send
|
||
|
* request/responses from the flow control (retry mechanism) of the
|
||
|
* port. A queued port can be used by both a master and a slave. The
|
||
|
* queue is a parameter to allow tailoring of the queue implementation
|
||
|
* (used in the cache).
|
||
|
*/
|
||
|
class QueuedPort : public Port
|
||
|
{
|
||
|
|
||
|
protected:
|
||
|
|
||
|
/** Packet queue used to store outgoing requests and responses. */
|
||
|
PacketQueue &queue;
|
||
|
|
||
|
/** This function is notification that the device should attempt to send a
|
||
|
* packet again. */
|
||
|
virtual void recvRetry() { queue.retry(); }
|
||
|
|
||
|
virtual void recvRangeChange() { }
|
||
|
|
||
|
public:
|
||
|
|
||
|
/**
|
||
|
* Create a QueuedPort with a given name, owner, and a supplied
|
||
|
* implementation of a packet queue. The external definition of
|
||
|
* the queue enables e.g. the cache to implement a specific queue
|
||
|
* behaviuor in a subclass, and provide the latter to the
|
||
|
* QueuePort constructor.
|
||
|
*/
|
||
|
QueuedPort(const std::string& name, MemObject* owner, PacketQueue &queue) :
|
||
|
Port(name, owner), queue(queue)
|
||
|
{ }
|
||
|
|
||
|
virtual ~QueuedPort() { }
|
||
|
|
||
|
/** Check the list of buffered packets against the supplied
|
||
|
* functional request. */
|
||
|
bool checkFunctional(PacketPtr pkt) { return queue.checkFunctional(pkt); }
|
||
|
|
||
|
/**
|
||
|
* Hook for draining the queued port.
|
||
|
*
|
||
|
* @param de an event which is used to signal back to the caller
|
||
|
* @returns a number indicating how many times process will be called
|
||
|
*/
|
||
|
unsigned int drain(Event *de) { return queue.drain(de); }
|
||
|
};
|
||
|
|
||
|
#endif // __MEM_QPORT_HH__
|