genode/repos/os/src/server/loader/child.h

/*
 * \brief  Loader child interface
 * \author Christian Prochaska
 * \author Norman Feske
 * \date   2009-10-05
 */

/*
 * 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 _CHILD_H_
#define _CHILD_H_

/* Genode includes */
#include <base/child.h>
#include <util/arg_string.h>
#include <init/child_policy.h>
#include <ram_session/connection.h>
#include <cpu_session/connection.h>
#include <pd_session/connection.h>
#include <region_map/client.h>


namespace Loader {

	using namespace Genode;

	typedef Registered<Parent_service> Parent_service;
	typedef Registry<Parent_service>   Parent_services;

	class Child : public Child_policy
	{
		private:

			Env &_env;

			Session_label const _label;
			Name          const _binary_name;

			size_t const _ram_quota;

			Parent_services &_parent_services;

			Service &_local_nitpicker_service;
			Service &_local_rom_service;
			Service &_local_cpu_service;
			Service &_local_pd_service;

			Genode::Child _child;

		public:

			Child(Env                       &env,
			      Name                const &binary_name,
			      Session_label       const &label,
			      size_t                     ram_quota,
			      Parent_services           &parent_services,
			      Service                   &local_rom_service,
			      Service                   &local_cpu_service,
			      Service                   &local_pd_service,
			      Service                   &local_nitpicker_service,
			      Signal_context_capability fault_sigh)
			:
				_env(env),
				_label(label),
				_binary_name(binary_name),
				_ram_quota(Genode::Child::effective_ram_quota(ram_quota)),
				_parent_services(parent_services),
				_local_nitpicker_service(local_nitpicker_service),
				_local_rom_service(local_rom_service),
				_local_cpu_service(local_cpu_service),
				_local_pd_service(local_pd_service),
				_child(_env.rm(), _env.ep().rpc_ep(), *this)
			{ }

			~Child() { }


			/****************************
			 ** Child-policy interface **
			 ****************************/

			Name name() const override { return _label; }

			Binary_name binary_name() const override { return _binary_name; }

			Ram_session           &ref_ram()           override { return _env.ram(); }
			Ram_session_capability ref_ram_cap() const override { return _env.ram_session_cap(); }

			void init(Ram_session &ram, Ram_session_capability ram_cap) override
			{
				ram.ref_account(ref_ram_cap());
				ref_ram().transfer_quota(ram_cap, _ram_quota);
			}

			Service &resolve_session_request(Service::Name const &name,
			                                 Session_state::Args const &args) override
			{
				if (name == "Nitpicker") return _local_nitpicker_service;
				if (name == "ROM")       return _local_rom_service;
				if (name == "CPU")       return _local_cpu_service;
				if (name == "PD")        return _local_pd_service;

				/* populate session-local parent service registry on demand */
				Service *service = nullptr;
				_parent_services.for_each([&] (Parent_service &s) {
					if (s.name() == name)
						service = &s; });

				if (service)
					return *service;

				return *new (env()->heap()) Parent_service(_parent_services, name);
			}
	};
}

#endif /* _CHILD_H_ */