gem5/src/mem/protocol/MOESI_hammer-msg.sm

/*
 * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
 * 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.
 *
 * AMD's contributions to the MOESI hammer protocol do not constitute an 
 * endorsement of its similarity to any AMD products.
 */

// CoherenceRequestType
enumeration(CoherenceRequestType, desc="...") {
  GETX,      desc="Get eXclusive";
  GETS,      desc="Get Shared";
  PUT,       desc="Put Ownership";
  WB_ACK,    desc="Writeback ack";
  WB_NACK,   desc="Writeback neg. ack";
}

// CoherenceResponseType
enumeration(CoherenceResponseType, desc="...") {
  ACK,                desc="ACKnowledgment, responder does not have a copy";
  ACK_SHARED,         desc="ACKnowledgment, responder has a shared copy";
  DATA,               desc="Data, responder does not have a copy";
  DATA_SHARED,        desc="Data, responder has a shared copy";
  DATA_EXCLUSIVE,     desc="Data, responder was exclusive, gave us a copy, and they went to invalid";
  WB_CLEAN,           desc="Clean writeback";
  WB_DIRTY,           desc="Dirty writeback";
  WB_EXCLUSIVE_CLEAN, desc="Clean writeback of exclusive data";
  WB_EXCLUSIVE_DIRTY, desc="Dirty writeback of exclusive data";
  UNBLOCK,            desc="Unblock";
}

// TriggerType
enumeration(TriggerType, desc="...") {
  ALL_ACKS,            desc="See corresponding event";
  ALL_ACKS_NO_SHARERS, desc="See corresponding event";
}

// TriggerMsg
structure(TriggerMsg, desc="...", interface="Message") {
  Address Address,             desc="Physical address for this request";
  TriggerType Type,            desc="Type of trigger";
}

// RequestMsg (and also forwarded requests)
structure(RequestMsg, desc="...", interface="NetworkMessage") {
  Address Address,             desc="Physical address for this request";
  CoherenceRequestType Type,   desc="Type of request (GetS, GetX, PutX, etc)";
  MachineID Requestor,            desc="Node who initiated the request";
  NetDest Destination,             desc="Multicast destination mask";
  MessageSizeType MessageSize, desc="size category of the message";
}

// ResponseMsg (and also unblock requests)
structure(ResponseMsg, desc="...", interface="NetworkMessage") {
  Address Address,             desc="Physical address for this request";
  CoherenceResponseType Type,  desc="Type of response (Ack, Data, etc)";
  MachineID Sender,               desc="Node who sent the data";
  NetDest Destination,             desc="Node to whom the data is sent";
  DataBlock DataBlk,           desc="data for the cache line";
  bool Dirty,                  desc="Is the data dirty (different than memory)?";
  int Acks,                    desc="How many messages this counts as";
  MessageSizeType MessageSize, desc="size category of the message";
}