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+/*
+ * Copyright (c) 2006 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * 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: Ali Saidi
+ */
+
+#ifndef __CPU_CPUEVENT_HH__
+#define __CPU_CPUEVENT_HH__
+
+#include <vector>
+#include "sim/eventq.hh"
+
+class ExecContext;
+
+/** This class creates a global list of events than need a pointer to an
+ * execution context. When a switchover takes place the events can be migrated
+ * to the new execution context, otherwise you could have a wake timer interrupt
+ * go off on a switched out cpu or other unfortunate events. This object MUST be
+ * dynamically allocated to avoid it being deleted after a cpu switch happens.
+ * */
+class CpuEvent : public Event
+{
+  private:
+    /** type of global list of cpu events. */
+    typedef std::vector<CpuEvent *> CpuEventList;
+
+    /** Static list of cpu events that is searched every time a cpu switch
+     * happens. */
+    static CpuEventList cpuEventList;
+
+    /** The execution context that is switched to the new cpus. */
+    ExecContext *xc;
+
+  public:
+    CpuEvent(EventQueue *q, ExecContext *_xc, Priority p = Default_Pri)
+        : Event(q, p), xc(_xc)
+    { cpuEventList.push_back(this); }
+
+    /** delete the cpu event from the global list. */
+    ~CpuEvent();
+
+    /** Update all events switching old xc to new xc.
+     * @param oldXc the old exeuction context we are switching from
+     * @param newXc the new execution context we are switching to.
+     */
+    static void replaceExecContext(ExecContext *oldXc, ExecContext *newXc);
+};
+
+template <class T, void (T::* F)(ExecContext *xc)>
+class CpuEventWrapper : public CpuEvent
+{
+  private:
+    T *object;
+
+  public:
+    CpuEventWrapper(T *obj, ExecContext *_xc, EventQueue *q = &mainEventQueue,
+            Priority p = Default_Pri)
+        : CpuEvent(q, _xc, p), object(obj)
+    { }
+    void process() { (object->*F)(xc); }
+};
+
+#endif // __CPU_CPUEVENT_HH__
+