misc: Coupling gem5 with SystemC TLM2.0

Transaction Level Modeling (TLM2.0) is widely used in industry for creating
virtual platforms (IEEE 1666 SystemC). This patch contains a standard compliant
implementation of an external gem5 port, that enables the usage of gem5 as a
TLM initiator component in SystemC based virtual platforms. Both TLM coding
paradigms loosely timed (b_transport) and aproximately timed (nb_transport) are
supported.

Compared to the original patch a TLM memory manager was added. Furthermore, the
transaction object was removed and for each TLM payload a PacketPointer that
points to the original gem5 packet is added as an TLM extension.  For event
handling single events are now created.

Committed by: Nilay Vaish <nilay@cs.wisc.edu>

1 files changed, 72 insertions, 0 deletions

diff --git a/util/tlm/sc_ext.cc b/util/tlm/sc_ext.cc
new file mode 100644
index 000000000..ce7417e49
--- /dev/null
+++ b/util/tlm/sc_ext.cc
@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2015, University of Kaiserslautern
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ * 2. 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.
+ *
+ * 3. Neither the name of the copyright holder 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 HOLDER
+ * 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:
+ *    Matthias Jung
+ */
+
+#include "sc_ext.hh"
+
+using namespace tlm;
+
+gem5Extension::gem5Extension(PacketPtr packet)
+{
+    Packet = packet;
+}
+
+gem5Extension& gem5Extension::getExtension(const tlm_generic_payload *payload)
+{
+    gem5Extension *result = NULL;
+    payload->get_extension(result);
+    sc_assert(result!=NULL);
+    return *result;
+}
+
+gem5Extension& gem5Extension::getExtension(const tlm_generic_payload &payload)
+{
+    return gem5Extension::getExtension(&payload);
+}
+
+PacketPtr gem5Extension::getPacket()
+{
+    return Packet;
+}
+
+tlm_extension_base* gem5Extension::clone() const
+{
+    return new gem5Extension(Packet);
+}
+
+void gem5Extension::copy_from(const tlm_extension_base& ext)
+{
+    const gem5Extension& cpyFrom = static_cast<const gem5Extension&>(ext);
+    Packet = cpyFrom.Packet;
+}