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-linux/include/base/ipc_msgbuf.h

@@ -0,0 +1,112 @@
+/*
+ * \brief  Linux-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
+	{
+		public:
+
+			enum { MAX_CAPS_PER_MSG = 8 };
+
+		protected:
+
+			/*
+			 * Capabilities (file descriptors) to be transferred
+			 */
+			int            _caps[MAX_CAPS_PER_MSG];
+			Genode::size_t _used_caps;
+			Genode::size_t _read_cap_index;
+
+			/**
+			 * Maximum size of plain-data message payload
+			 */
+			Genode::size_t _size;
+
+			/**
+			 * Actual size of plain-data message payload
+			 */
+			Genode::size_t _used_size;
+
+			char _msg_start[];  /* symbol marks start of message buffer data */
+
+			/*
+			 * No member variables are allowed beyond this point!
+			 */
+
+		public:
+
+			char buf[];
+
+			Msgbuf_base() { reset_caps(); }
+
+			/**
+			 * Return size of message buffer
+			 */
+			inline Genode::size_t size() const { return _size; };
+
+			/**
+			 * Return address of message buffer
+			 */
+			inline void *addr() { return &_msg_start[0]; };
+
+			void reset_caps() { _used_caps = 0; _read_cap_index = 0; }
+
+			bool append_cap(int cap)
+			{
+				if (_used_caps == MAX_CAPS_PER_MSG)
+					return false;
+
+				_caps[_used_caps++] = cap;
+				return true;
+			}
+
+			int read_cap()
+			{
+				if (_read_cap_index == _used_caps)
+					return -1;
+
+				return _caps[_read_cap_index++];
+			}
+
+			size_t used_caps() const { return _used_caps; }
+
+			int cap(unsigned index) const
+			{
+				return index < _used_caps ? _caps[index] : -1;
+			}
+	};
+
+
+	/**
+	 * Pump up IPC message buffer to 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_ */