genode/os/include/regulator/component.h
2013-06-28 14:24:34 +02:00

112 lines
2.7 KiB
C++

/*
* \brief Regulator-session component
* \author Stefan Kalkowski
* \date 2013-06-13
*/
/*
* Copyright (C) 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__REGULATOR__COMPONENT_H_
#define _INCLUDE__REGULATOR__COMPONENT_H_
#include <root/component.h>
#include <regulator_session/rpc_object.h>
#include <regulator/driver.h>
namespace Regulator {
class Session_component;
class Root;
}
class Regulator::Session_component : public Regulator::Session_rpc_object
{
private:
Driver_factory &_driver_factory;
Driver &_driver;
public:
/**
* Constructor
*/
Session_component(Regulator_id regulator_id,
Driver_factory &driver_factory)
: Session_rpc_object(regulator_id),
_driver_factory(driver_factory),
_driver(_driver_factory.create(regulator_id)) { }
/**
* Destructor
*/
~Session_component()
{
_driver.state(_id, false);
_driver_factory.destroy(_driver);
}
/***********************************
** Regulator session interface **
***********************************/
void level(unsigned long level) { _driver.level(_id, level); }
unsigned long level() { return _driver.level(_id); }
void state(bool enable) { _driver.state(_id, enable); }
bool state() { return _driver.state(_id); }
};
class Regulator::Root :
public Genode::Root_component<Regulator::Session_component>
{
private:
Driver_factory &_driver_factory;
Genode::Rpc_entrypoint &_ep;
protected:
Session_component *_create_session(const char *args)
{
using namespace Genode;
char reg_name[64];
Arg_string::find_arg(args, "regulator").string(reg_name,
sizeof(reg_name), 0);
size_t ram_quota =
Arg_string::find_arg(args, "ram_quota").ulong_value(0);
/* delete ram quota by the memory needed for the session */
size_t session_size = max((size_t)4096,
sizeof(Session_component));
if (ram_quota < session_size)
throw Root::Quota_exceeded();
if (!strlen(reg_name))
throw Root::Invalid_args();
return new (md_alloc())
Session_component(regulator_id_by_name(reg_name),
_driver_factory);
}
public:
Root(Genode::Rpc_entrypoint *session_ep,
Genode::Allocator *md_alloc,
Driver_factory &driver_factory)
: Genode::Root_component<Regulator::Session_component>(session_ep,
md_alloc),
_driver_factory(driver_factory), _ep(*session_ep) { }
};
#endif /* _INCLUDE__REGULATOR__COMPONENT_H_ */