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, 140 insertions, 0 deletions

diff --git a/ext/systemc/src/sysc/communication/sc_mutex.cpp b/ext/systemc/src/sysc/communication/sc_mutex.cpp
new file mode 100644
index 000000000..d2c43244c
--- /dev/null
+++ b/ext/systemc/src/sysc/communication/sc_mutex.cpp
@@ -0,0 +1,140 @@
+/*****************************************************************************
+
+  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_mutex.cpp -- The sc_mutex primitive channel class.
+
+  Original Author: Martin Janssen, Synopsys, Inc., 2001-05-21
+
+  CHANGE LOG IS AT THE END OF THE FILE
+ *****************************************************************************/
+
+#include "sysc/communication/sc_mutex.h"
+#include "sysc/kernel/sc_simcontext.h"
+
+namespace sc_core {
+
+// ----------------------------------------------------------------------------
+//  CLASS : sc_mutex
+//
+//  The sc_mutex primitive channel class.
+// ----------------------------------------------------------------------------
+
+// constructors
+
+sc_mutex::sc_mutex()
+: sc_object( sc_gen_unique_name( "mutex" ) ),
+  m_owner( 0 ),
+  m_free( (std::string(SC_KERNEL_EVENT_PREFIX)+"_free_event").c_str() )
+{}
+
+sc_mutex::sc_mutex( const char* name_ )
+: sc_object( name_ ),
+  m_owner( 0 ),
+  m_free( (std::string(SC_KERNEL_EVENT_PREFIX)+"_free_event").c_str() )
+{}
+
+
+// destructor
+
+sc_mutex::~sc_mutex()
+{}
+
+// interface methods
+
+// blocks until mutex could be locked
+
+int
+sc_mutex::lock()
+{
+    if ( m_owner == sc_get_current_process_b()) return 0;
+    while( in_use() ) {
+	sc_core::wait( m_free, sc_get_curr_simcontext() );
+    }
+    m_owner = sc_get_current_process_b();
+    return 0;
+}
+
+
+// returns -1 if mutex could not be locked
+
+int
+sc_mutex::trylock()
+{
+    if ( m_owner == sc_get_current_process_b()) return 0;
+    if( in_use() ) {
+	return -1;
+    }
+    m_owner = sc_get_current_process_b();
+    return 0;
+}
+
+
+// returns -1 if mutex was not locked by caller
+
+int
+sc_mutex::unlock()
+{
+    if( m_owner != sc_get_current_process_b() ) {
+	return -1;
+    }
+    m_owner = 0;
+    m_free.notify();
+    return 0;
+}
+
+} // namespace sc_core
+
+// $Log: sc_mutex.cpp,v $
+// Revision 1.7  2011/08/26 20:45:40  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  2011/03/28 13:02:29  acg
+//  Andy Goodrich: removed sc_event in sc_mutex class from the object
+//  hierarchy since it is considered a "kernel" event.
+//
+// Revision 1.5  2011/02/18 20:23:45  acg
+//  Andy Goodrich: Copyright update.
+//
+// Revision 1.4  2010/11/02 16:31:01  acg
+//  Andy Goodrich: changed object derivation to use sc_object rather than
+//  sc_prim_channel as the parent class.
+//
+// Revision 1.3  2008/11/13 15:29:46  acg
+//  David C. Black, ESLX, Inc: lock & trylock now allow owner to apply
+//  lock more than once without incident. Previous behavior locked up the
+//  owning process.
+//
+// Revision 1.2  2008/05/20 16:46:18  acg
+//  Andy Goodrich: added checks for multiple writers.
+//
+// Revision 1.1.1.1  2006/12/15 20:20:04  acg
+// SystemC 2.3
+//
+// Revision 1.4  2006/03/21 00:00:27  acg
+//   Andy Goodrich: changed name of sc_get_current_process_base() to be
+//   sc_get_current_process_b() since its returning an sc_process_b instance.
+//
+// Revision 1.3  2006/01/13 18:47:42  acg
+// Added $Log command so that CVS comments are reproduced in the source.
+//
+
+// Taf!