2 * Copyright (c) 2012 ARM Limited
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
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8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder. You may use the software subject to the license
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23 * this software without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37 * Authors: Andreas Hansson
40 #ifndef __MEM_QPORT_HH__
41 #define __MEM_QPORT_HH__
45 * Declaration of the queued port.
48 #include "mem/packet_queue.hh"
49 #include "mem/port.hh"
52 * A queued port is a port that has an infinite queue for outgoing
53 * packets and thus decouples the module that wants to send
54 * request/responses from the flow control (retry mechanism) of the
55 * port. A queued port can be used by both a master and a slave. The
56 * queue is a parameter to allow tailoring of the queue implementation
57 * (used in the cache).
59 class QueuedSlavePort : public SlavePort
64 /** Packet queue used to store outgoing requests and responses. */
65 SlavePacketQueue &queue;
67 /** This function is notification that the device should attempt to send a
69 virtual void recvRetry() { queue.retry(); }
74 * Create a QueuedPort with a given name, owner, and a supplied
75 * implementation of a packet queue. The external definition of
76 * the queue enables e.g. the cache to implement a specific queue
77 * behaviuor in a subclass, and provide the latter to the
78 * QueuePort constructor.
80 QueuedSlavePort(const std::string& name, MemObject* owner,
81 SlavePacketQueue &queue) :
82 SlavePort(name, owner), queue(queue)
85 virtual ~QueuedSlavePort() { }
87 /** Check the list of buffered packets against the supplied
88 * functional request. */
89 bool checkFunctional(PacketPtr pkt) { return queue.checkFunctional(pkt); }
92 * Hook for draining the queued port.
94 * @param de an event which is used to signal back to the caller
95 * @returns a number indicating how many times process will be called
97 unsigned int drain(Event *de) { return queue.drain(de); }
100 class QueuedMasterPort : public MasterPort
105 /** Packet queue used to store outgoing requests and responses. */
106 MasterPacketQueue &queue;
108 /** This function is notification that the device should attempt to send a
110 virtual void recvRetry() { queue.retry(); }
115 * Create a QueuedPort with a given name, owner, and a supplied
116 * implementation of a packet queue. The external definition of
117 * the queue enables e.g. the cache to implement a specific queue
118 * behaviuor in a subclass, and provide the latter to the
119 * QueuePort constructor.
121 QueuedMasterPort(const std::string& name, MemObject* owner,
122 MasterPacketQueue &queue) :
123 MasterPort(name, owner), queue(queue)
126 virtual ~QueuedMasterPort() { }
128 /** Check the list of buffered packets against the supplied
129 * functional request. */
130 bool checkFunctional(PacketPtr pkt) { return queue.checkFunctional(pkt); }
133 * Hook for draining the queued port.
135 * @param de an event which is used to signal back to the caller
136 * @returns a number indicating how many times process will be called
138 unsigned int drain(Event *de) { return queue.drain(de); }
141 #endif // __MEM_QPORT_HH__