1/* 2 * Copyright (c) 2013 ARM Limited 3 * Copyright (c) 2013 Cornell University 4 * All rights reserved 5 * 6 * The license below extends only to copyright in the software and shall 7 * not be construed as granting a license to any other intellectual 8 * property including but not limited to intellectual property relating 9 * to a hardware implementation of the functionality of the software 10 * licensed hereunder. You may use the software subject to the license 11 * terms below provided that you ensure that this notice is replicated 12 * unmodified and in its entirety in all distributions of the software, 13 * modified or unmodified, in source code or in binary form. 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions are 17 * met: redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer; 19 * redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution; 22 * neither the name of the copyright holders nor the names of its 23 * contributors may be used to endorse or promote products derived from 24 * this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 27 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 28 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 29 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 30 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 31 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 32 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 33 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 34 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 35 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 36 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 37 * 38 * Authors: Vasileios Spiliopoulos 39 * Akash Bagdia 40 * Christopher Torng 41 */ 42 43/** 44 * @file 45 * ClockDomain declarations. 46 */ 47 48#ifndef __SIM_CLOCK_DOMAIN_HH__ 49#define __SIM_CLOCK_DOMAIN_HH__ 50 51#include <algorithm> 52 53#include "base/statistics.hh" 54#include "params/ClockDomain.hh" 55#include "params/DerivedClockDomain.hh" 56#include "params/SrcClockDomain.hh" 57#include "sim/sim_object.hh" 58 59/** 60 * Forward declaration 61 */ 62class DerivedClockDomain; 63class VoltageDomain; 64class ClockedObject; 65 66/** 67 * The ClockDomain provides clock to group of clocked objects bundled 68 * under the same clock domain. The clock domains, in turn, are 69 * grouped into voltage domains. The clock domains provide support for 70 * a hierarchial structure with source and derived domains. 71 */ 72class ClockDomain : public SimObject 73{ 74
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82 protected: 83 84 /** 85 * Pre-computed clock period in ticks. This is populated by the 86 * inheriting classes based on how their period is determined. 87 */ 88 Tick _clockPeriod; 89 90 /** 91 * Voltage domain this clock domain belongs to 92 */ 93 VoltageDomain *_voltageDomain; 94 95 /** 96 * Pointers to potential derived clock domains so we can propagate 97 * changes. 98 */ 99 std::vector<DerivedClockDomain*> children; 100 101 /** 102 * Pointers to members of this clock domain, so that when the clock 103 * period changes, we can update each member's tick. 104 */ 105 std::vector<ClockedObject*> members; 106 107 public: 108 109 typedef ClockDomainParams Params; 110 ClockDomain(const Params *p, VoltageDomain *voltage_domain) : 111 SimObject(p), 112 _clockPeriod(0), 113 _voltageDomain(voltage_domain) {} 114
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