115 lines
4.1 KiB
C++
115 lines
4.1 KiB
C++
/*
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* Copyright (c) 2003 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* @file
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* Declaration of the Packet Class, a packet is a transaction occuring
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* between a single level of the memory heirarchy (ie L1->L2).
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*/
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#ifndef __MEM_PACKET_HH__
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#define __MEM_PACKET_HH__
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/** List of all commands associated with a packet. */
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enum Command
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{
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Read,
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Write
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};
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/** The result of a particular pakets request. */
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enum PacketResult
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{
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Success,
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BadAddress
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};
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/**
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* A Packet is the structure to handle requests between two levels
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* of the memory system. The Request is a global object that trancends
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* all of the memory heirarchy, but at each levels interface a packet
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* is created to transfer data/requests. For example, a request would
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* be used to initiate a request to go to memory/IOdevices, as the request
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* passes through the memory system several packets will be created. One
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* will be created to go between the L1 and L2 caches and another to go to
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* the next level and so forth.
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*
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* Packets are assumed to be returned in the case of a single response. If
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* the transaction has no response, then the consumer will delete the packet.
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*/
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struct Packet
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{
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/** The address of the request, could be virtual or physical (depending on
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cache configurations). */
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Addr addr;
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/** Flag structure to hold flags for this particular packet */
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uint64_t flags;
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/** A pointer to the overall request. */
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RequestPtr req;
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/** A virtual base opaque structure used to hold
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coherence status messages. */
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Coherence *coherence; // virtual base opaque,
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// assert(dynamic_cast<Foo>) etc.
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/** A virtual base opaque structure used to hold the senders state. */
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SenderState *senderState; // virtual base opaque,
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// assert(dynamic_cast<Foo>) etc.
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/** A pointer to the data being transfered. It can be differnt sizes
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at each level of the heirarchy so it belongs in the packet,
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not request*/
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PacketDataPtr data;
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/** Indicates the size of the request. */
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int size;
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/** A index of the source of the transaction. */
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short src;
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/** A index to the destination of the transaction. */
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short dest;
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/** The command of the transaction. */
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Command cmd;
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/** The result of the packet transaction. */
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PacketResult result;
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/** Accessor function that returns the source index of the packet. */
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short getSrc() const { return src; }
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/** Accessor function that returns the destination index of
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the packet. */
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short getDest() const { return dest; }
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};
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#endif //__MEM_PACKET_HH
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