From 8723b08dbf254bc436eac2b2ddf86efa02fc4274 Mon Sep 17 00:00:00 2001
From: Matthias Jung <jungma@eit.uni-kl.de>
Date: Mon, 3 Aug 2015 23:08:40 -0500
Subject: 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>
---
 util/tlm/sc_mm.cc | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 util/tlm/sc_mm.cc

(limited to 'util/tlm/sc_mm.cc')

diff --git a/util/tlm/sc_mm.cc b/util/tlm/sc_mm.cc
new file mode 100644
index 000000000..509d429c2
--- /dev/null
+++ b/util/tlm/sc_mm.cc
@@ -0,0 +1,74 @@
+/*
+ * 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:
+ *    Robert Gernhardt
+ *    Matthias Jung
+ */
+
+#include <iostream>
+
+#include "sc_mm.hh"
+
+using namespace std;
+
+MemoryManager::MemoryManager(): numberOfAllocations(0), numberOfFrees(0)
+{
+
+}
+
+MemoryManager::~MemoryManager()
+{
+    for(gp* payload: freePayloads) {
+        delete payload;
+        numberOfFrees++;
+    }
+}
+
+gp*
+MemoryManager::allocate()
+{
+    if(freePayloads.empty()) {
+        numberOfAllocations++;
+        return new gp(this);
+    } else {
+        gp* result = freePayloads.back();
+        freePayloads.pop_back();
+        return result;
+    }
+}
+
+void
+MemoryManager::free(gp* payload)
+{
+    payload->reset(); //clears all extensions
+    freePayloads.push_back(payload);
+}
-- 
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