/*
 * \brief  CPU root interface
 * \author Christian Helmuth
 * \date   2006-07-17
 */

/*
 * Copyright (C) 2006-2017 Genode Labs GmbH
 *
 * This file is part of the Genode OS framework, which is distributed
 * under the terms of the GNU Affero General Public License version 3.
 */

#ifndef _CORE__INCLUDE__CPU_ROOT_H_
#define _CORE__INCLUDE__CPU_ROOT_H_

/* Genode includes */
#include <root/component.h>

/* Core includes */
#include <cpu_session_component.h>

namespace Core { class Cpu_root; }


class Core::Cpu_root : public Root_component<Cpu_session_component>
{
	private:

		Ram_allocator          &_ram_alloc;
		Local_rm               &_local_rm;
		Rpc_entrypoint         &_thread_ep;
		Pager_entrypoint       &_pager_ep;
		Trace::Source_registry &_trace_sources;

	protected:

		Create_result _create_session(char const *args, Affinity const &affinity) override
		{
			return _alloc_obj(*this->ep(),
			                  session_resources_from_args(args),
			                  session_label_from_args(args),
			                  _ram_alloc, _local_rm,
			                  _thread_ep, _pager_ep, _trace_sources,
			                  args, affinity).convert<Create_result>(

				[&] (Cpu_session_component &cpu) -> Create_result {
					if (cpu.constructed.ok())
						return { cpu };

					Alloc_error const e = cpu.constructed.convert<Alloc_error>(
						[&] (Ok)            { return Alloc_error::DENIED; },
						[&] (Alloc_error e) { return e; });

					_destroy_session(cpu);

					switch (e) {
					case Alloc_error::OUT_OF_RAM:  return Session_error::INSUFFICIENT_RAM;
					case Alloc_error::OUT_OF_CAPS: return Session_error::INSUFFICIENT_CAPS;
					case Alloc_error::DENIED:      break;
					}
					return Session_error::DENIED;
				},
				[&] (Session_error e) { return e; });
		}

		void _upgrade_session(Cpu_session_component &cpu, const char *args) override
		{
			cpu.upgrade(ram_quota_from_args(args));
			cpu.upgrade(cap_quota_from_args(args));
		}

	public:

		/**
		 * Constructor
		 *
		 * \param session_ep   entry point for managing cpu session objects
		 * \param thread_ep    entry point for managing threads
		 * \param md_alloc     meta data allocator to be used by root component
		 */
		Cpu_root(Ram_allocator          &ram_alloc,
		         Local_rm               &local_rm,
		         Rpc_entrypoint         &session_ep,
		         Rpc_entrypoint         &thread_ep,
		         Pager_entrypoint       &pager_ep,
		         Allocator              &md_alloc,
		         Trace::Source_registry &trace_sources)
		:
			Root_component<Cpu_session_component>(&session_ep, &md_alloc),
			_ram_alloc(ram_alloc), _local_rm(local_rm),
			_thread_ep(thread_ep), _pager_ep(pager_ep),
			_trace_sources(trace_sources)
		{ }
};

#endif /* _CORE__INCLUDE__CPU_ROOT_H_ */
