Move server API concept to base framework

This commit introduces the new `Component` interface in the form of the
headers base/component.h and base/entrypoint.h. The os/server.h API
has become merely a compatibilty wrapper and will eventually be removed.
The same holds true for os/signal_rpc_dispatcher.h. The mechanism has
moved to base/signal.h and is now called 'Signal_handler'.

Since the patch shuffles headers around, please do a 'make clean' in the
build directory.

Issue #1832

repos/base/include/base/component.h

@@ -0,0 +1,78 @@
+/*
+ * \brief  Hook functions for bootstrapping the component
+ * \author Norman Feske
+ * \date   2015-12-17
+ */
+
+/*
+ * Copyright (C) 2015 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__COMPONENT_H_
+#define _INCLUDE__BASE__COMPONENT_H_
+
+#include <base/stdint.h>
+#include <parent/parent.h>
+#include <base/entrypoint.h>
+#include <ram_session/capability.h>
+#include <cpu_session/capability.h>
+#include <rm_session/rm_session.h>
+#include <pd_session/pd_session.h>
+
+
+namespace Genode { struct Environment; }
+
+
+/**
+ * Interface to be provided by the component implementation
+ */
+namespace Component
+{
+	Genode::size_t stack_size();
+	char const *name();
+	void construct(Genode::Environment &);
+}
+
+
+struct Genode::Environment
+{
+	virtual Parent &parent() = 0;
+
+	/**
+	 * RAM session of the component
+	 *
+	 * The RAM Session represents a budget of memory (quota) that is available
+	 * to the component. This budget can be used to allocate RAM dataspaces.
+	 */
+	virtual Ram_session &ram() = 0;
+
+	/**
+	 * CPU session of the component
+	 *
+	 * This session is used to create the threads of the component.
+	 */
+	virtual Cpu_session &cpu() = 0;
+
+	/**
+	 * Region-manager session of the component as created by the parent
+	 */
+	virtual Rm_session &rm() = 0;
+
+	/**
+	 * PD session of the component as created by the parent
+	 */
+	virtual Pd_session &pd() = 0;
+
+	/**
+	 * Entrypoint for handling RPC requests and signals
+	 */
+	virtual Entrypoint &ep() = 0;
+
+	virtual Ram_session_capability ram_session_cap() = 0;
+	virtual Cpu_session_capability cpu_session_cap() = 0;
+};
+
+#endif /* _INCLUDE__BASE__COMPONENT_H_ */