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+/*
+ * Copyright (c) 2003 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.
+ */
+
+/* @file
+ * Device module for modelling an ethernet hub
+ */
+
+#ifndef __ETHERBUS_H__
+#define __ETHERBUS_H__
+
+#include "eventq.hh"
+#include "etherpkt.hh"
+#include "sim_object.hh"
+
+class EtherDump;
+class EtherInt;
+class EtherBus : public SimObject
+{
+  protected:
+    typedef std::list<EtherInt *> devlist_t;
+    devlist_t devlist;
+    double ticks_per_byte;
+    bool loopback;
+
+  protected:
+    class DoneEvent : public Event
+    {
+      protected:
+        EtherBus *bus;
+
+      public:
+        DoneEvent(EventQueue *q, EtherBus *b)
+            : Event(q), bus(b) {}
+        virtual void process() { bus->txDone(); }
+        virtual const char *description() { return "ethernet bus completion"; }
+    };
+
+    DoneEvent event;
+    PacketPtr packet;
+    EtherInt *sender;
+    EtherDump *dump;
+
+  public:
+    EtherBus(const std::string &name, double ticks_per_byte, bool loopback,
+             EtherDump *dump);
+    virtual ~EtherBus() {}
+
+    void txDone();
+    void reg(EtherInt *dev);
+    bool busy() const { return (bool)packet; }
+    bool send(EtherInt *sender, PacketPtr packet);
+};
+
+#endif // __ETHERBUS_H__