genode/repos/base-fiasco/include/base/ipc_msgbuf.h

/*
 * \brief  Fiasco-specific layout of IPC message buffer
 * \author Norman Feske
 * \date   2006-06-14
 */

/*
 * Copyright (C) 2006-2013 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:

			Genode::size_t _size;

		public:

			/*
			 * Begin of message buffer layout
			 */

			Fiasco::l4_fpage_t   rcv_fpage;
			Fiasco::l4_msgdope_t size_dope;
			Fiasco::l4_msgdope_t send_dope;
			char                 buf[];

			/**
			 * Return size of message buffer
			 */
			inline size_t size() const { return _size; };

			/**
			 * Return address of message buffer
			 */
			inline void *addr() { return &rcv_fpage; };
	};


	/**
	 * 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; }
	};
}

#endif /* _INCLUDE__BASE__IPC_MSGBUF_H_ */