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diff --git a/src/mem/ruby/network/orion/power_arbiter.hh b/src/mem/ruby/network/orion/power_arbiter.hh
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+/*
+ * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
+ * 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.
+ */
+
+// Arbiter
+
+
+#ifndef _POWER_ARBITER_H
+#define _POWER_ARBITER_H
+
+#include "power_array.hh"
+
+typedef enum {
+        RR_ARBITER =1,
+        MATRIX_ARBITER,
+        QUEUE_ARBITER,
+        ARBITER_MAX_MODEL
+} power_arbiter_model;
+
+typedef enum {
+        NEG_DFF = 1,    /* negative egde-triggered D flip-flop */
+        FF_MAX_MODEL
+} power_ff_model;
+
+typedef struct {
+        int model;
+        unsigned long int n_switch;
+        unsigned long int n_keep_1;
+        unsigned long int n_keep_0;
+        unsigned long int n_clock;
+        double e_switch;
+        double e_keep_1;
+        double e_keep_0;
+        double e_clock;
+        double i_leakage;
+} power_ff;
+
+typedef struct{
+        int model;
+        unsigned req_width;
+        unsigned long int n_chg_req;
+        unsigned long int n_chg_grant;
+        unsigned long int n_chg_carry; //internal node of rr arbiter
+        unsigned long int n_chg_carry_in; //internal node of rr arbiter
+        unsigned long int n_chg_mint; //internal node of matrix arbiter
+        unsigned long int mask;
+        double e_chg_req;
+        double e_chg_grant;
+        double e_chg_carry;
+        double e_chg_carry_in;
+        double e_chg_mint;
+        power_ff pri_ff; //priority ff
+        power_array queue; //request queue
+        double i_leakage;
+} power_arbiter;
+
+extern int arbiter_record(power_arbiter *arb, unsigned long int new_req, unsigned long int old_req, unsigned new_grant, unsigned old_grant);
+
+extern double arbiter_report(power_arbiter *arb);
+
+extern int power_arbiter_init(power_arbiter *arb, int arbiter_model, int ff_model, unsigned req_width, double length, power_array_info *info);
+
+#endif
+
+
+