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diff --git a/sys/dev/isci/scil/scu_unsolicited_frame.h b/sys/dev/isci/scil/scu_unsolicited_frame.h
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+/*-
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ * The full GNU General Public License is included in this distribution
+ * in the file called LICENSE.GPL.
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
+ * 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.
+ *
+ * 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.
+ *
+ * $FreeBSD$
+ */
+/**
+ * @file
+ *
+ * @brief This field defines the SCU format of an unsolicited frame (UF).  A
+ *        UF is a frame received by the SCU for which there is no known
+ *        corresponding task context (TC).
+ */
+
+#ifndef _SCU_UNSOLICITED_FRAME_H_
+#define _SCU_UNSOLICITED_FRAME_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif // __cplusplus
+
+#include <dev/isci/scil/sci_types.h>
+
+/**
+ * This constant defines the number of DWORDS found the unsolicited frame
+ * header data member.
+ */
+#define SCU_UNSOLICITED_FRAME_HEADER_DATA_DWORDS 15
+
+/**
+ * @struct SCU_UNSOLICITED_FRAME_HEADER
+ *
+ * This structure delineates the format of an unsolicited frame header.
+ * The first DWORD are UF attributes defined by the silicon architecture.
+ * The data depicts actual header information received on the link.
+ */
+typedef struct SCU_UNSOLICITED_FRAME_HEADER
+{
+   /**
+    * This field indicates if there is an Initiator Index Table entry with
+    * which this header is associated.
+    */
+   U32 iit_exists : 1;
+
+   /**
+    * This field simply indicates the protocol type (i.e. SSP, STP, SMP).
+    */
+   U32 protocol_type : 3;
+
+   /**
+    * This field indicates if the frame is an address frame (IAF or OAF)
+    * or if it is a information unit frame.
+    */
+   U32 is_address_frame : 1;
+
+   /**
+    * This field simply indicates the connection rate at which the frame
+    * was received.
+    */
+   U32 connection_rate : 4;
+
+   U32 reserved : 23;
+
+   /**
+    * This field represents the actual header data received on the link.
+    */
+   U32 data[SCU_UNSOLICITED_FRAME_HEADER_DATA_DWORDS];
+
+} SCU_UNSOLICITED_FRAME_HEADER_T;
+
+#ifdef __cplusplus
+}
+#endif // __cplusplus
+
+#endif // _SCU_UNSOLICITED_FRAME_H_