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diff --git a/decoder/include/interfaces/trc_instr_decode_i.h b/decoder/include/interfaces/trc_instr_decode_i.h
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+/*
+ * \file       trc_instr_decode_i.h
+ * \brief      OpenCSD : Interface for instruction decode.
+ * 
+ * \copyright  Copyright (c) 2015, ARM Limited. All Rights Reserved.
+ */
+
+/* 
+ * Redistribution and use in source and binary forms, with or without modification, 
+ * are permitted provided that the following conditions are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright notice, 
+ * this list of conditions and the following disclaimer.
+ * 
+ * 2. 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. 
+ * 
+ * 3. Neither the name of the copyright holder 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 HOLDER 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. 
+ */ 
+
+#ifndef ARM_TRC_INSTR_DECODE_I_H_INCLUDED
+#define ARM_TRC_INSTR_DECODE_I_H_INCLUDED
+
+/*!
+ * @class IInstrDecode   
+ * @ingroup ocsd_interfaces
+ * @brief Interface class to an instruction opcode decoder.
+ *
+ * The opcode decoder needs to be capable of limited decode required for trace
+ * execution flow determination.
+ *
+ */
+class IInstrDecode 
+{
+public:
+    IInstrDecode() {}; /**< Default constructor. */
+    virtual ~IInstrDecode() {}; /**< Default destructor. */
+
+    /*!
+     * Instruction opcode decode for the packet trace decoder to follow the
+     * instruction execution flow. 
+     *
+     * @param *instr_info : Structure to pass current opcode, and receive required decode information.
+     *
+     * @return ocsd_err_t  : OCSD_OK if successful.
+     */
+    virtual ocsd_err_t DecodeInstruction(ocsd_instr_info *instr_info) = 0;
+};
+
+#endif // ARM_TRC_INSTR_DECODE_I_H_INCLUDED
+
+/* End of File trc_instr_decode_i.h */