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diff --git a/src/mem/ruby/network/orion/power_crossbar.hh b/src/mem/ruby/network/orion/power_crossbar.hh
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+++ b/src/mem/ruby/network/orion/power_crossbar.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.
+ */
+
+// Crossbar
+
+#ifndef _POWER_CROSSBAR_H
+#define _POWER_CROSSBAR_H
+
+typedef enum {
+        TRANS_GATE,
+        TRISTATE_GATE
+} power_connect_model;
+
+/* transmission gate type */
+typedef enum {
+        N_GATE,
+        NP_GATE
+} power_trans;
+
+typedef enum {
+        MATRIX_CROSSBAR =1,
+        MULTREE_CROSSBAR,
+        CUT_THRU_CROSSBAR,
+        CROSSBAR_MAX_MODEL
+} power_crossbar_model;
+
+
+typedef struct {
+        int model;
+        unsigned n_in;
+        unsigned n_out;
+        unsigned data_width;
+        unsigned degree;       //used only for multree xbar
+        unsigned connect_type;
+        unsigned trans_type;
+        unsigned long int n_chg_in;
+        unsigned long int n_chg_int;
+        unsigned long int n_chg_out;
+        unsigned long int n_chg_ctr;
+        unsigned long int mask;
+        double e_chg_in;
+        double e_chg_int;
+        double e_chg_out;
+        double e_chg_ctr;
+        unsigned depth;  //used only for multree xbar
+        double i_leakage;
+} power_crossbar;
+
+
+extern int crossbar_record(power_crossbar *xb, int io, unsigned long int new_data, unsigned long int old_data, unsigned new_port, unsigned old_port);
+
+extern int power_crossbar_init(power_crossbar *crsbar, int model, unsigned n_in, unsigned n_out, unsigned data_width, unsigned degree, int connect_type, int trans_type, double in_len, double out_len, double *req_len);
+
+extern double crossbar_report(power_crossbar *crsbar);
+
+#endif