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diff --git a/common/trace_format.hpp b/common/trace_format.hpp
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+/**************************************************************************
+ *
+ * Copyright 2010 VMware, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ **************************************************************************/
+
+/*
+ * Trace binary format.
+ *
+ * Grammar:
+ *
+ *   trace = event* EOF
+ *
+ *   event = EVENT_ENTER call_sig call_detail+
+ *         | EVENT_LEAVE call_no call_detail+
+ *
+ *   call_sig = sig_id ( name arg_names )?
+ *
+ *   call_detail = ARG index value
+ *               | RET value
+ *               | END
+ *
+ *   value = NULL
+ *         | FALSE
+ *         | TRUE
+ *         | SINT int
+ *         | UINT int
+ *         | FLOAT float
+ *         | DOUBLE double
+ *         | STRING string
+ *         | BLOB string
+ *         | ENUM enum_sig
+ *         | BITMASK bitmask_sig value
+ *         | ARRAY length value+
+ *         | STRUCT struct_sig value+
+ *         | OPAQUE int
+ *
+ *   call_sig = id name arg_name*
+ *            | id
+ *
+ *   enum_sig = id name value
+ *            | id
+ *
+ *   bitmask_sig = id count (name value)+
+ *               | id
+ *
+ *   string = length (BYTE)*
+ *
+ */
+
+#ifndef _TRACE_FORMAT_HPP_
+#define _TRACE_FORMAT_HPP_
+
+namespace Trace {
+
+#define TRACE_VERSION 1
+
+enum Event {
+    EVENT_ENTER = 0,
+    EVENT_LEAVE,
+};
+
+enum CallDetail {
+    CALL_END = 0,
+    CALL_ARG,
+    CALL_RET,
+    CALL_THREAD,
+};
+
+enum Type {
+    TYPE_NULL = 0,
+    TYPE_FALSE,
+    TYPE_TRUE,
+    TYPE_SINT,
+    TYPE_UINT,
+    TYPE_FLOAT,
+    TYPE_DOUBLE,
+    TYPE_STRING, // Null terminated, human readible string
+    TYPE_BLOB, // Block of bytes
+    TYPE_ENUM,
+    TYPE_BITMASK,
+    TYPE_ARRAY,
+    TYPE_STRUCT,
+    TYPE_OPAQUE,
+};
+
+
+} /* namespace Trace */
+
+#endif /* _TRACE_FORMAT_HPP_ */