2009-11-19 01:34:33 +01:00
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/*
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* Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
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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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machine(DMA, "DMA Controller")
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2010-01-30 05:29:25 +01:00
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: DMASequencer * dma_sequencer,
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2010-03-22 05:22:21 +01:00
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int request_latency = 6
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2009-11-19 01:34:33 +01:00
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{
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2010-03-22 05:22:21 +01:00
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MessageBuffer responseFromDir, network="From", virtual_network="5", ordered="true", no_vector="true";
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MessageBuffer reqToDirectory, network="To", virtual_network="0", ordered="false", no_vector="true";
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2009-11-19 01:34:33 +01:00
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2011-02-24 01:41:59 +01:00
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state_declaration(State, desc="DMA states", default="DMA_State_READY") {
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READY, AccessPermission:Invalid, desc="Ready to accept a new request";
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BUSY_RD, AccessPermission:Busy, desc="Busy: currently processing a request";
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BUSY_WR, AccessPermission:Busy, desc="Busy: currently processing a request";
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2009-11-19 01:34:33 +01:00
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}
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enumeration(Event, desc="DMA events") {
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ReadRequest, desc="A new read request";
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WriteRequest, desc="A new write request";
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Data, desc="Data from a DMA memory read";
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Ack, desc="DMA write to memory completed";
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}
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2011-03-18 20:12:04 +01:00
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structure(DMASequencer, external="yes") {
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2009-11-19 01:34:33 +01:00
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void ackCallback();
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void dataCallback(DataBlock);
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}
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MessageBuffer mandatoryQueue, ordered="false", no_vector="true";
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State cur_state, no_vector="true";
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State getState(Address addr) {
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return cur_state;
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}
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void setState(Address addr, State state) {
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cur_state := state;
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}
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out_port(reqToDirectory_out, DMARequestMsg, reqToDirectory, desc="...");
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in_port(dmaRequestQueue_in, SequencerMsg, mandatoryQueue, desc="...") {
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if (dmaRequestQueue_in.isReady()) {
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peek(dmaRequestQueue_in, SequencerMsg) {
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if (in_msg.Type == SequencerRequestType:LD ) {
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trigger(Event:ReadRequest, in_msg.LineAddress);
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} else if (in_msg.Type == SequencerRequestType:ST) {
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trigger(Event:WriteRequest, in_msg.LineAddress);
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} else {
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error("Invalid request type");
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}
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}
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}
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}
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in_port(dmaResponseQueue_in, DMAResponseMsg, responseFromDir, desc="...") {
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if (dmaResponseQueue_in.isReady()) {
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peek( dmaResponseQueue_in, DMAResponseMsg) {
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if (in_msg.Type == DMAResponseType:ACK) {
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trigger(Event:Ack, in_msg.LineAddress);
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} else if (in_msg.Type == DMAResponseType:DATA) {
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trigger(Event:Data, in_msg.LineAddress);
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} else {
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error("Invalid response type");
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}
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}
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}
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}
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action(s_sendReadRequest, "s", desc="Send a DMA read request to memory") {
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peek(dmaRequestQueue_in, SequencerMsg) {
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enqueue(reqToDirectory_out, DMARequestMsg, latency=request_latency) {
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out_msg.PhysicalAddress := in_msg.PhysicalAddress;
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out_msg.LineAddress := in_msg.LineAddress;
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out_msg.Type := DMARequestType:READ;
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out_msg.Requestor := machineID;
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out_msg.DataBlk := in_msg.DataBlk;
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out_msg.Len := in_msg.Len;
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out_msg.Destination.add(map_Address_to_Directory(address));
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out_msg.MessageSize := MessageSizeType:Writeback_Control;
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}
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}
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}
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action(s_sendWriteRequest, "\s", desc="Send a DMA write request to memory") {
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peek(dmaRequestQueue_in, SequencerMsg) {
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enqueue(reqToDirectory_out, DMARequestMsg, latency=request_latency) {
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out_msg.PhysicalAddress := in_msg.PhysicalAddress;
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out_msg.LineAddress := in_msg.LineAddress;
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out_msg.Type := DMARequestType:WRITE;
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out_msg.Requestor := machineID;
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out_msg.DataBlk := in_msg.DataBlk;
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out_msg.Len := in_msg.Len;
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out_msg.Destination.add(map_Address_to_Directory(address));
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out_msg.MessageSize := MessageSizeType:Writeback_Control;
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}
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}
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}
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action(a_ackCallback, "a", desc="Notify dma controller that write request completed") {
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peek (dmaResponseQueue_in, DMAResponseMsg) {
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dma_sequencer.ackCallback();
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}
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}
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action(d_dataCallback, "d", desc="Write data to dma sequencer") {
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peek (dmaResponseQueue_in, DMAResponseMsg) {
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dma_sequencer.dataCallback(in_msg.DataBlk);
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}
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}
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action(p_popRequestQueue, "p", desc="Pop request queue") {
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dmaRequestQueue_in.dequeue();
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}
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action(p_popResponseQueue, "\p", desc="Pop request queue") {
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dmaResponseQueue_in.dequeue();
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}
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transition(READY, ReadRequest, BUSY_RD) {
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s_sendReadRequest;
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p_popRequestQueue;
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}
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transition(READY, WriteRequest, BUSY_WR) {
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s_sendWriteRequest;
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p_popRequestQueue;
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}
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transition(BUSY_RD, Data, READY) {
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d_dataCallback;
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p_popResponseQueue;
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}
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transition(BUSY_WR, Ack, READY) {
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a_ackCallback;
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p_popResponseQueue;
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}
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}
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