Move repositories to 'repos/' subdirectory

This patch changes the top-level directory layout as a preparatory
step for improving the tools for managing 3rd-party source codes.
The rationale is described in the issue referenced below.

Issue #1082

repos/base-codezero/include/base/ipc_msgbuf.h

@@ -0,0 +1,63 @@
+/*
+ * \brief  IPC message buffer
+ * \author Norman Feske
+ * \date   2009-10-02
+ */
+
+/*
+ * Copyright (C) 2009-2013 Genode Labs GmbH
+ *
+ * This file is part of the Genode OS framework, which is distributed
+ * under the terms of the GNU General Public License version 2.
+ */
+
+#ifndef _INCLUDE__BASE__IPC_MSGBUF_H_
+#define _INCLUDE__BASE__IPC_MSGBUF_H_
+
+namespace Genode {
+
+	/**
+	 * IPC message buffer layout
+	 */
+	class Msgbuf_base
+	{
+		protected:
+
+			size_t _size;
+			char   _msg_start[];  /* symbol marks start of message */
+
+		public:
+
+			/*
+			 * Begin of actual message buffer
+			 */
+			char buf[];
+
+			/**
+			 * Return size of message buffer
+			 */
+			inline size_t size() const { return _size; };
+
+			/**
+			 * Return address of message buffer
+			 */
+			inline void *addr() { return &_msg_start[0]; };
+
+	} __attribute__((aligned(4)));
+
+	/**
+	 * Instance of IPC message buffer with specified buffer size
+	 */
+	template <unsigned BUF_SIZE>
+	class Msgbuf : public Msgbuf_base
+	{
+		public:
+
+			char buf[BUF_SIZE];
+
+			Msgbuf() { _size = BUF_SIZE; }
+
+	} __attribute__((aligned(4)));
+}
+
+#endif /* _INCLUDE__BASE__IPC_MSGBUF_H_ */