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diff --git a/src/systemc/core/list.hh b/src/systemc/core/list.hh
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+/*
+ * Copyright 2018 Google, Inc.
+ *
+ * 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;
+ * neither the name of the copyright holders 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
+ * 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.
+ *
+ * Authors: Gabe Black
+ */
+
+#ifndef __SYSTEMC_CORE_LIST_HH__
+#define __SYSTEMC_CORE_LIST_HH__
+
+#include <functional>
+
+#include "base/fiber.hh"
+#include "systemc/core/object.hh"
+#include "systemc/ext/core/sc_event.hh"
+#include "systemc/ext/core/sc_module.hh"
+#include "systemc/ext/core/sc_process_handle.hh"
+
+namespace sc_gem5
+{
+
+struct ListNode
+{
+    ListNode() : nextListNode(nullptr), prevListNode(nullptr) {}
+    virtual ~ListNode() {}
+
+    ListNode *nextListNode;
+    ListNode *prevListNode;
+
+    void
+    popListNode()
+    {
+        if (nextListNode)
+            nextListNode->prevListNode = prevListNode;
+        if (prevListNode)
+            prevListNode->nextListNode = nextListNode;
+        nextListNode = nullptr;
+        prevListNode = nullptr;
+    }
+};
+
+template <typename T>
+struct NodeList : public ListNode
+{
+    NodeList()
+    {
+        nextListNode = this;
+        prevListNode = this;
+    }
+
+    void
+    pushFirst(T *t)
+    {
+        // Make sure this node isn't currently in a different list.
+        t->popListNode();
+
+        // The node behind t is whoever used to be first.
+        t->nextListNode = nextListNode;
+        // The node that used to be first is behind t.
+        nextListNode->prevListNode = t;
+
+        // Nobody is in front of t.
+        t->prevListNode = this;
+        // The first node is t.
+        nextListNode = t;
+    }
+
+    void
+    pushLast(T *t)
+    {
+        // Make sure this node isn't currently in a different list.
+        t->popListNode();
+
+        // The node in front of t is whoever used to be last.
+        t->prevListNode = prevListNode;
+        // The node that used to be last is in front of t.
+        prevListNode->nextListNode = t;
+
+        // Nobody is behind t.
+        t->nextListNode = this;
+        // The last node is t.
+        prevListNode = t;
+    }
+
+    T *getNext() { return dynamic_cast<T *>(nextListNode); }
+    bool empty() { return getNext() == nullptr; }
+};
+
+} // namespace sc_gem5
+
+#endif  //__SYSTEMC_CORE_LIST_HH__