Add .svn file so other people can keep update with changes from Stanford

Code Review: Issue 103001

[git-p4: depot-paths = "//depot/gpgpu_sim_research/fermi/distribution/": change = 17411]

1 files changed, 125 insertions, 0 deletions

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+// $Id$
+
+/*
+ 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.
+*/
+
+//////////////////////////////////////////////////////////////////////
+//
+//  File Name: channel.hpp
+//
+//  The Channel models a generic channel with a multi-cycle 
+//   transmission delay. The channel latency can be specified as 
+//   an integer number of simulator cycles.
+//
+/////
+#ifndef _CHANNEL_HPP
+#define _CHANNEL_HPP
+
+#include <queue>
+#include <cassert>
+
+#include "globals.hpp"
+#include "module.hpp"
+#include "timed_module.hpp"
+
+using namespace std;
+
+template<typename T>
+class Channel : public TimedModule {
+public:
+  Channel(Module * parent, string const & name);
+  virtual ~Channel() {}
+
+  // Physical Parameters
+  void SetLatency(int cycles);
+  int GetLatency() const { return _delay ; }
+  
+  // Send data 
+  virtual void Send(T * data);
+  
+  // Receive data
+  virtual T * Receive(); 
+  
+  virtual void ReadInputs();
+  virtual void Evaluate() {}
+  virtual void WriteOutputs();
+
+protected:
+  int _delay;
+  T * _input;
+  T * _output;
+  queue<pair<int, T *> > _wait_queue;
+
+};
+
+template<typename T>
+Channel<T>::Channel(Module * parent, string const & name)
+  : TimedModule(parent, name), _delay(1), _input(0), _output(0) {
+}
+
+template<typename T>
+void Channel<T>::SetLatency(int cycles) {
+  if(cycles <= 0) {
+    Error("Channel must have positive delay.");
+  }
+  _delay = cycles ;
+}
+
+template<typename T>
+void Channel<T>::Send(T * data) {
+  _input = data;
+}
+
+template<typename T>
+T * Channel<T>::Receive() {
+  return _output;
+}
+
+template<typename T>
+void Channel<T>::ReadInputs() {
+  if(_input) {
+    _wait_queue.push(make_pair(GetSimTime() + _delay - 1, _input));
+    _input = 0;
+  }
+}
+
+template<typename T>
+void Channel<T>::WriteOutputs() {
+  _output = 0;
+  if(_wait_queue.empty()) {
+    return;
+  }
+  pair<int, T *> const & item = _wait_queue.front();
+  int const & time = item.first;
+  if(GetSimTime() < time) {
+    return;
+  }
+  assert(GetSimTime() == time);
+  _output = item.second;
+  assert(_output);
+  _wait_queue.pop();
+}
+
+#endif