WireBuffer.cc revision 10301:44839e8febbd
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 MessageBufferNode thisNode(arrival_time, m_msg_counter, message); 81 m_message_queue.push_back(thisNode); 82 if (m_consumer_ptr != NULL) { 83 m_consumer_ptr-> 84 scheduleEventAbsolute(g_system_ptr->clockPeriod() * arrival_time); 85 } else { 86 panic("No Consumer for WireBuffer! %s\n", *this); 87 } 88} 89 90void 91WireBuffer::dequeue() 92{ 93 assert(isReady()); 94 pop_heap(m_message_queue.begin(), m_message_queue.end(), 95 greater<MessageBufferNode>()); 96 m_message_queue.pop_back(); 97} 98 99const Message* 100WireBuffer::peek() 101{ 102 MessageBufferNode node = peekNode(); 103 Message* msg_ptr = node.m_msgptr.get(); 104 assert(msg_ptr != NULL); 105 return msg_ptr; 106} 107 108MessageBufferNode 109WireBuffer::peekNode() 110{ 111 assert(isReady()); 112 MessageBufferNode req = m_message_queue.front(); 113 return req; 114} 115 116void 117WireBuffer::recycle() 118{ 119 // Because you don't want anything reordered, make sure the recycle latency 120 // is just 1 cycle. As a result, you really want to use this only in 121 // Wire-like situations because you don't want to deadlock as a result of 122 // being stuck behind something if you're not actually supposed to. 123 assert(isReady()); 124 MessageBufferNode node = m_message_queue.front(); 125 pop_heap(m_message_queue.begin(), m_message_queue.end(), 126 greater<MessageBufferNode>()); 127 128 node.m_time = g_system_ptr->curCycle() + Cycles(1); 129 m_message_queue.back() = node; 130 push_heap(m_message_queue.begin(), m_message_queue.end(), 131 greater<MessageBufferNode>()); 132 m_consumer_ptr-> 133 scheduleEventAbsolute(g_system_ptr->clockPeriod() * node.m_time); 134} 135 136bool 137WireBuffer::isReady() 138{ 139 return ((!m_message_queue.empty()) && 140 (m_message_queue.front().m_time <= g_system_ptr->curCycle())); 141} 142 143void 144WireBuffer::print(ostream& out) const 145{ 146} 147 148void 149WireBuffer::wakeup() 150{ 151} 152 153WireBuffer * 154RubyWireBufferParams::create() 155{ 156 return new WireBuffer(this); 157} 158 159