WireBuffer.cc revision 10893:f567e80c0714
1/* 2 * Copyright (c) 2010 Advanced Micro Devices, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Author: Lisa Hsu 29 * 30 */ 31 32#include <algorithm> 33#include <functional> 34 35#include "base/cprintf.hh" 36#include "base/stl_helpers.hh" 37#include "mem/ruby/common/Global.hh" 38#include "mem/ruby/structures/WireBuffer.hh" 39#include "mem/ruby/system/System.hh" 40 41using namespace std; 42 43// Output operator definition 44 45ostream& 46operator<<(ostream& out, const WireBuffer& obj) 47{ 48 obj.print(out); 49 out << flush; 50 return out; 51} 52 53 54// **************************************************************** 55 56// CONSTRUCTOR 57WireBuffer::WireBuffer(const Params *p) 58 : SimObject(p) 59{ 60 m_msg_counter = 0; 61} 62 63void 64WireBuffer::init() 65{ 66} 67 68WireBuffer::~WireBuffer() 69{ 70} 71 72void 73WireBuffer::enqueue(MsgPtr message, Cycles latency) 74{ 75 m_msg_counter++; 76 Cycles current_time = g_system_ptr->curCycle(); 77 Cycles arrival_time = current_time + latency; 78 assert(arrival_time > current_time); 79 80 Message* msg_ptr = message.get(); 81 msg_ptr->setLastEnqueueTime(arrival_time); 82 m_message_queue.push_back(message); 83 if (m_consumer_ptr != NULL) { 84 m_consumer_ptr-> 85 scheduleEventAbsolute(g_system_ptr->clockPeriod() * arrival_time); 86 } else { 87 panic("No Consumer for WireBuffer! %s\n", *this); 88 } 89} 90 91void 92WireBuffer::dequeue() 93{ 94 assert(isReady()); 95 pop_heap(m_message_queue.begin(), m_message_queue.end(), 96 greater<MsgPtr>()); 97 m_message_queue.pop_back(); 98} 99 100const Message* 101WireBuffer::peek() 102{ 103 Message* msg_ptr = m_message_queue.front().get(); 104 assert(msg_ptr != NULL); 105 return msg_ptr; 106} 107 108void 109WireBuffer::recycle() 110{ 111 // Because you don't want anything reordered, make sure the recycle latency 112 // is just 1 cycle. As a result, you really want to use this only in 113 // Wire-like situations because you don't want to deadlock as a result of 114 // being stuck behind something if you're not actually supposed to. 115 assert(isReady()); 116 MsgPtr node = m_message_queue.front(); 117 pop_heap(m_message_queue.begin(), m_message_queue.end(), greater<MsgPtr>()); 118 119 node->setLastEnqueueTime(g_system_ptr->curCycle() + Cycles(1)); 120 m_message_queue.back() = node; 121 push_heap(m_message_queue.begin(), m_message_queue.end(), 122 greater<MsgPtr>()); 123 m_consumer_ptr-> 124 scheduleEventAbsolute(g_system_ptr->curCycle() + Cycles(1)); 125} 126 127bool 128WireBuffer::isReady() 129{ 130 return ((!m_message_queue.empty()) && 131 (m_message_queue.front()->getLastEnqueueTime() <= 132 g_system_ptr->curCycle())); 133} 134 135void 136WireBuffer::print(ostream& out) const 137{ 138} 139 140void 141WireBuffer::wakeup() 142{ 143} 144 145WireBuffer * 146RubyWireBufferParams::create() 147{ 148 return new WireBuffer(this); 149} 150