167 lines
4.3 KiB
C++
167 lines
4.3 KiB
C++
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/*
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* Copyright (c) 2010 Advanced Micro Devices, Inc.
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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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* Author: Lisa Hsu
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*
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*/
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#include <algorithm>
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#include <functional>
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#include "base/cprintf.hh"
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#include "base/stl_helpers.hh"
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#include "mem/ruby/system/WireBuffer.hh"
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using namespace std;
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class Consumer;
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// Output operator definition
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ostream&
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operator<<(ostream& out, const WireBuffer& obj)
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{
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obj.print(out);
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out << flush;
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return out;
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}
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// ****************************************************************
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// CONSTRUCTOR
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WireBuffer::WireBuffer(const Params *p)
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: SimObject(p)
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{
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m_msg_counter = 0;
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}
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void
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WireBuffer::init()
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{
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}
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WireBuffer::~WireBuffer()
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{
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}
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void
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WireBuffer::enqueue(MsgPtr message, int latency)
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{
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m_msg_counter++;
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Time current_time = g_eventQueue_ptr->getTime();
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Time arrival_time = current_time + latency;
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assert(arrival_time > current_time);
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MessageBufferNode thisNode(arrival_time, m_msg_counter, message);
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m_message_queue.push_back(thisNode);
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if (m_consumer_ptr != NULL) {
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g_eventQueue_ptr->scheduleEventAbsolute(m_consumer_ptr, arrival_time);
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} else {
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panic("No Consumer for WireBuffer! %s\n", *this);
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}
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}
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void
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WireBuffer::dequeue()
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{
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assert(isReady());
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pop_heap(m_message_queue.begin(), m_message_queue.end(),
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greater<MessageBufferNode>());
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m_message_queue.pop_back();
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}
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const Message*
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WireBuffer::peek()
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{
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MessageBufferNode node = peekNode();
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Message* msg_ptr = node.m_msgptr.get();
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assert(msg_ptr != NULL);
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return msg_ptr;
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}
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MessageBufferNode
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WireBuffer::peekNode()
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{
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assert(isReady());
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MessageBufferNode req = m_message_queue.front();
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return req;
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}
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void
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WireBuffer::recycle()
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{
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// Because you don't want anything reordered, make sure the recycle latency
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// is just 1 cycle. As a result, you really want to use this only in
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// Wire-like situations because you don't want to deadlock as a result of
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// being stuck behind something if you're not actually supposed to.
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assert(isReady());
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MessageBufferNode node = m_message_queue.front();
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pop_heap(m_message_queue.begin(), m_message_queue.end(),
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greater<MessageBufferNode>());
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node.m_time = g_eventQueue_ptr->getTime() + 1;
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m_message_queue.back() = node;
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push_heap(m_message_queue.begin(), m_message_queue.end(),
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greater<MessageBufferNode>());
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g_eventQueue_ptr->scheduleEventAbsolute(m_consumer_ptr,
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g_eventQueue_ptr->getTime() + 1);
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}
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bool
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WireBuffer::isReady()
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{
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return ((!m_message_queue.empty()) &&
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(m_message_queue.front().m_time <= g_eventQueue_ptr->getTime()));
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}
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void
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WireBuffer::print(ostream& out) const
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{
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}
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void
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WireBuffer::clearStats() const
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{
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}
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void
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WireBuffer::printStats(ostream& out) const
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{
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}
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void
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WireBuffer::wakeup()
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{
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}
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WireBuffer *
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RubyWireBufferParams::create()
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{
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return new WireBuffer(this);
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}
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