ext: Include SystemC 2.3.1 into gem5

In the past it happened several times that some changes in gem5 broke the
SystemC coupling. Recently Accelera has changed the licence for SystemC
from their own licence to Apache2.0, which is compatible with gem5.
However, SystemC usually relies on the Boost library, but I was able to
exchange the boost calls by c++11 alternatives. The recent SystemC version
is placed into /ext and is integrated into gem5's build system. The goal is
to integrate some SystemC tests for the CI in some following patches.

Change-Id: I4b66ec806b5e3cffc1d7c85d3735ff4fa5b31fd0
Reviewed-on: https://gem5-review.googlesource.com/2240
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>

1 files changed, 194 insertions, 0 deletions

diff --git a/ext/systemc/src/sysc/communication/sc_buffer.h b/ext/systemc/src/sysc/communication/sc_buffer.h
new file mode 100644
index 000000000..e91c1a7c9
--- /dev/null
+++ b/ext/systemc/src/sysc/communication/sc_buffer.h
@@ -0,0 +1,194 @@
+/*****************************************************************************
+
+  Licensed to Accellera Systems Initiative Inc. (Accellera) under one or
+  more contributor license agreements.  See the NOTICE file distributed
+  with this work for additional information regarding copyright ownership.
+  Accellera licenses this file to you under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with the
+  License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+  implied.  See the License for the specific language governing
+  permissions and limitations under the License.
+
+ *****************************************************************************/
+
+/*****************************************************************************
+
+  sc_buffer.h -- The sc_buffer<T> primitive channel class.
+                 Like sc_signal<T>, but *every* write causes an event.
+
+  Original Author: Martin Janssen, Synopsys, Inc., 2001-05-21
+
+  CHANGE LOG IS AT THE END OF THE FILE
+ *****************************************************************************/
+
+#ifndef SC_BUFFER_H
+#define SC_BUFFER_H
+
+
+#include "sysc/communication/sc_signal.h"
+
+namespace sc_core {
+
+// ----------------------------------------------------------------------------
+//  CLASS : sc_buffer<T>
+//
+//  The sc_buffer<T> primitive channel class.
+// ----------------------------------------------------------------------------
+
+template< typename T, sc_writer_policy POL = SC_DEFAULT_WRITER_POLICY >
+class sc_buffer
+: public sc_signal<T,POL>
+{
+public:
+
+    // typedefs
+
+    typedef sc_buffer<T,POL> this_type;
+    typedef sc_signal<T,POL> base_type;
+
+public:
+
+    // constructors
+
+    sc_buffer()
+	: base_type( sc_gen_unique_name( "buffer" ) )
+	{}
+
+    explicit sc_buffer( const char* name_ )
+	: base_type( name_ )
+	{}
+
+    sc_buffer( const char* name_, const T& initial_value_ )
+      : base_type( name_, initial_value_ )
+    {}
+
+    // interface methods
+
+    // write the new value
+    virtual void write( const T& );
+
+
+    // other methods
+
+    this_type& operator = ( const T& a )
+	{ write( a ); return *this; }
+
+    this_type& operator = ( const sc_signal_in_if<T>& a )
+	{ write( a.read() ); return *this; }
+
+    this_type& operator = ( const this_type& a )
+	{ write( a.read() ); return *this; }
+
+    virtual const char* kind() const
+        { return "sc_buffer"; }
+
+protected:
+
+    virtual void update();
+
+private:
+
+    // disabled
+    sc_buffer( const this_type& );
+};
+
+
+// IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII
+
+// write the new value
+
+template< typename T, sc_writer_policy POL >
+inline
+void
+sc_buffer<T,POL>::write( const T& value_ )
+{
+    if( !base_type::policy_type::check_write(this,true) )
+      return;
+
+    this->m_new_val = value_;
+    this->request_update();
+}
+
+
+template< typename T, sc_writer_policy POL >
+inline
+void
+sc_buffer<T,POL>::update()
+{
+    base_type::policy_type::update();
+    base_type::do_update();
+}
+
+} // namespace sc_core
+
+#endif
+
+//$Log: sc_buffer.h,v $
+//Revision 1.7  2011/08/26 20:45:39  acg
+// Andy Goodrich: moved the modification log to the end of the file to
+// eliminate source line number skew when check-ins are done.
+//
+//Revision 1.6  2011/04/08 18:22:45  acg
+// Philipp A. Hartmann: use the context of the primitive channel to get
+// the change stamp value.
+//
+//Revision 1.5  2011/04/05 20:48:09  acg
+// Andy Goodrich: changes to make sure that event(), posedge() and negedge()
+// only return true if the clock has not moved.
+//
+//Revision 1.4  2011/04/05 06:15:18  acg
+// Philipp A. Hartmann: sc_writer_policy: ignore no-ops in delta check.
+//
+//Revision 1.3  2011/02/18 20:23:45  acg
+// Andy Goodrich: Copyright update.
+//
+//Revision 1.2  2010/12/07 19:50:36  acg
+// Andy Goodrich: addition of writer policies, courtesy of Philipp Hartmann.
+//
+//Revision 1.1.1.1  2006/12/15 20:20:04  acg
+//SystemC 2.3
+//
+//Revision 1.8  2006/03/13 20:19:43  acg
+// Andy Goodrich: changed sc_event instances into pointers to sc_event instances
+// that are allocated as needed. This saves considerable storage for large
+// numbers of signals, etc.
+//
+//Revision 1.7  2006/01/26 21:00:49  acg
+// Andy Goodrich: conversion to use sc_event::notify(SC_ZERO_TIME) instead of
+// sc_event::notify_delayed()
+//
+//Revision 1.6  2006/01/24 20:46:31  acg
+//Andy Goodrich: changes to eliminate use of deprecated features. For instance,
+//using notify(SC_ZERO_TIME) in place of notify_delayed().
+//
+//Revision 1.5  2006/01/19 19:18:25  acg
+//Andy Goodrich: eliminated check_writer in favor of inline code within the
+//write() method since we always execute the check_writer code even when
+//check writing is turned off.
+//
+//Revision 1.4  2006/01/19 00:30:57  acg
+//Andy Goodrich: Yet another implementation for disabling write checks on
+//signals. This version uses an environment variable, SC_SIGNAL_WRITE_CHECK,
+//that when set to DISABLE will turn off write checking.
+//
+//Revision 1.3  2006/01/13 18:47:20  acg
+//Reversed sense of multiwriter signal check. It now defaults to ON unless the
+//user defines SC_NO_WRITE_CHEK before inclusion of the file.
+//
+//Revision 1.2  2006/01/03 23:18:26  acg
+//Changed copyright to include 2006.
+//
+//Revision 1.1.1.1  2005/12/19 23:16:43  acg
+//First check in of SystemC 2.1 into its own archive.
+//
+//Revision 1.9  2005/06/10 22:43:55  acg
+//Added CVS change log annotation.
+//
+
+// Taf!