102 lines
3.5 KiB
C++
102 lines
3.5 KiB
C++
|
/*
|
||
|
* Copyright (c) 2011 Advanced Micro Devices
|
||
|
* All rights reserved.
|
||
|
*
|
||
|
* Redistribution and use in source and binary forms, with or without
|
||
|
* modification, are permitted provided that the following conditions are
|
||
|
* met: redistributions of source code must retain the above copyright
|
||
|
* notice, this list of conditions and the following disclaimer;
|
||
|
* redistributions in binary form must reproduce the above copyright
|
||
|
* notice, this list of conditions and the following disclaimer in the
|
||
|
* documentation and/or other materials provided with the distribution;
|
||
|
* neither the name of the copyright holders nor the names of its
|
||
|
* contributors may be used to endorse or promote products derived from
|
||
|
* this software without specific prior written permission.
|
||
|
*
|
||
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
||
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
||
|
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
||
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
||
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
||
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
||
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||
|
*
|
||
|
* Authors: Gabe Black
|
||
|
*/
|
||
|
|
||
|
/**
|
||
|
* @file This file defines the Root simobject and the methods used to control
|
||
|
* the time syncing mechanism provided through it.
|
||
|
*
|
||
|
* Time syncing prevents simulated time from passing faster than real time. It
|
||
|
* works by scheduling a periodic event that checks to see if its simulated
|
||
|
* period is shorter than its real period. If it is, it stalls the simulation
|
||
|
* until they're equal.
|
||
|
*/
|
||
|
|
||
|
#ifndef __SIM_ROOT_HH__
|
||
|
#define __SIM_ROOT_HH__
|
||
|
|
||
|
#include "base/time.hh"
|
||
|
#include "params/Root.hh"
|
||
|
#include "sim/eventq.hh"
|
||
|
#include "sim/sim_object.hh"
|
||
|
|
||
|
class Root : public SimObject
|
||
|
{
|
||
|
private:
|
||
|
static Root *_root;
|
||
|
|
||
|
protected:
|
||
|
bool _enabled;
|
||
|
Time _period;
|
||
|
Tick _periodTick;
|
||
|
Time _spinThreshold;
|
||
|
|
||
|
Time lastTime;
|
||
|
|
||
|
void timeSync();
|
||
|
EventWrapper<Root, &Root::timeSync> syncEvent;
|
||
|
friend class EventWrapper<Root, &Root::timeSync>;
|
||
|
|
||
|
public:
|
||
|
/**
|
||
|
* Use this function to get a pointer to the single Root object in the
|
||
|
* simulation. This function asserts that such an object has actual been
|
||
|
* constructed to avoid having to perform that check everywhere the root
|
||
|
* is used. This is to allow calling the functions below.
|
||
|
*
|
||
|
* @return Pointer to the single root object.
|
||
|
*/
|
||
|
static Root *
|
||
|
root()
|
||
|
{
|
||
|
assert(_root);
|
||
|
return _root;
|
||
|
}
|
||
|
|
||
|
public:
|
||
|
|
||
|
/// Check whether time syncing is enabled.
|
||
|
bool timeSyncEnabled() const { return _enabled; }
|
||
|
/// Retrieve the period for the sync event.
|
||
|
const Time timeSyncPeriod() const { return _period; }
|
||
|
/// Retrieve the threshold for time remaining to spin wait.
|
||
|
const Time timeSyncSpinThreshold() const { return _spinThreshold; }
|
||
|
|
||
|
/// Enable or disable time syncing.
|
||
|
void timeSyncEnable(bool en);
|
||
|
/// Configure the period for time sync events.
|
||
|
void timeSyncPeriod(Time newPeriod);
|
||
|
/// Set the threshold for time remaining to spin wait.
|
||
|
void timeSyncSpinThreshold(Time newThreshold);
|
||
|
|
||
|
Root(RootParams *p);
|
||
|
};
|
||
|
|
||
|
#endif // __SIM_ROOT_HH__
|