1/* 2 * Copyright (c) 2017 Jason Lowe-Power 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 * Authors: Jason Lowe-Power 29 */ 30 31#include "learning_gem5/part2/goodbye_object.hh" 32 33#include "debug/HelloExample.hh" 34#include "sim/sim_exit.hh" 35 36GoodbyeObject::GoodbyeObject(GoodbyeObjectParams *params) : 37 SimObject(params), event([this]{ processEvent(); }, name() + ".event"), 38 bandwidth(params->write_bandwidth), bufferSize(params->buffer_size), 39 buffer(nullptr), bufferUsed(0) 40{ 41 buffer = new char[bufferSize]; 42 DPRINTF(HelloExample, "Created the goodbye object\n"); 43} 44 45GoodbyeObject::~GoodbyeObject() 46{ 47 delete[] buffer; 48} 49 50void 51GoodbyeObject::processEvent() 52{ 53 DPRINTF(HelloExample, "Processing the event!\n"); 54 55 // Actually do the "work" of the event 56 fillBuffer(); 57} 58 59void 60GoodbyeObject::sayGoodbye(std::string other_name) 61{ 62 DPRINTF(HelloExample, "Saying goodbye to %s\n", other_name); 63 64 message = "Goodbye " + other_name + "!! "; 65 66 // Kick off the the first buffer fill. If it can't fill the whole buffer 67 // because of a limited bandwidth, then this function will schedule another 68 // event to finish the fill 69 fillBuffer(); 70} 71 72void 73GoodbyeObject::fillBuffer() 74{ 75 // There better be a message 76 assert(message.length() > 0); 77 78 // Copy from the message to the buffer per byte. 79 int bytes_copied = 0; 80 for (auto it = message.begin(); 81 it < message.end() && bufferUsed < bufferSize - 1; 82 it++, bufferUsed++, bytes_copied++) { 83 // Copy the character into the buffer 84 buffer[bufferUsed] = *it; 85 } 86 87 if (bufferUsed < bufferSize - 1) { 88 // Wait for the next copy for as long as it would have taken 89 DPRINTF(HelloExample, "Scheduling another fillBuffer in %d ticks\n", 90 bandwidth * bytes_copied); 91 schedule(event, curTick() + bandwidth * bytes_copied); 92 } else { 93 DPRINTF(HelloExample, "Goodbye done copying!\n"); 94 // Be sure to take into account the time for the last bytes 95 exitSimLoop(buffer, 0, curTick() + bandwidth * bytes_copied); 96 } 97} 98 99GoodbyeObject* 100GoodbyeObjectParams::create() 101{ 102 return new GoodbyeObject(this); 103} 104