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// $Id: vc.hpp 5188 2012-08-30 00:31:31Z dub $
/*
Copyright (c) 2007-2012, Trustees of The Leland Stanford Junior University
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.
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.
*/
#ifndef _VC_HPP_
#define _VC_HPP_
#include <deque>
#include "flit.hpp"
#include "outputset.hpp"
#include "routefunc.hpp"
#include "config_utils.hpp"
class VC : public Module {
public:
enum eVCState { state_min = 0, idle = state_min, routing, vc_alloc, active,
state_max = active };
struct state_info_t {
int cycles;
};
static const char * const VCSTATE[];
private:
deque<Flit *> _buffer;
eVCState _state;
OutputSet *_route_set;
int _out_port, _out_vc;
enum ePrioType { local_age_based, queue_length_based, hop_count_based, none, other };
ePrioType _pri_type;
int _pri;
int _priority_donation;
bool _watched;
int _expected_pid;
int _last_id;
int _last_pid;
bool _lookahead_routing;
public:
VC( const Configuration& config, int outputs,
Module *parent, const string& name );
~VC();
void AddFlit( Flit *f );
inline Flit *FrontFlit( ) const
{
return _buffer.empty() ? NULL : _buffer.front();
}
Flit *RemoveFlit( );
inline bool Empty( ) const
{
return _buffer.empty( );
}
inline VC::eVCState GetState( ) const
{
return _state;
}
void SetState( eVCState s );
const OutputSet *GetRouteSet( ) const;
void SetRouteSet( OutputSet * output_set );
void SetOutput( int port, int vc );
inline int GetOutputPort( ) const
{
return _out_port;
}
inline int GetOutputVC( ) const
{
return _out_vc;
}
void UpdatePriority();
inline int GetPriority( ) const
{
return _pri;
}
void Route( tRoutingFunction rf, const Router* router, const Flit* f, int in_channel );
inline int GetOccupancy() const
{
return (int)_buffer.size();
}
// ==== Debug functions ====
void SetWatch( bool watch = true );
bool IsWatched( ) const;
void Display( ostream & os = cout ) const;
};
#endif
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