114 lines
1.9 KiB
C++
114 lines
1.9 KiB
C++
/*
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* \brief A timer manages a continuous time and timeouts on it
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* \author Martin Stein
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* \date 2016-03-23
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*/
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/*
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* Copyright (C) 2016-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _CORE__KERNEL__TIMER_H_
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#define _CORE__KERNEL__TIMER_H_
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/* base-hw includes */
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#include <kernel/types.h>
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#include "irq.h"
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/* Genode includes */
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#include <util/list.h>
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#include <board.h>
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namespace Kernel
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{
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class Cpu;
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class Timeout;
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class Timer;
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}
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/**
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* A timeout causes a kernel pass and the call of a timeout specific handle
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*/
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class Kernel::Timeout : Genode::List<Timeout>::Element
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{
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friend class Timer;
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friend class Genode::List<Timeout>;
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private:
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bool _listed = false;
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time_t _end = 0;
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public:
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/**
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* Callback handle
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*/
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virtual void timeout_triggered() { }
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virtual ~Timeout() { }
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};
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/**
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* A timer manages a continuous time and timeouts on it
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*/
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class Kernel::Timer
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{
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private:
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class Irq : private Kernel::Irq
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{
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private:
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Cpu & _cpu;
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public:
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Irq(unsigned id, Cpu & cpu);
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void occurred() override;
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};
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Board::Timer _device;
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Irq _irq;
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time_t _time = 0;
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time_t _last_timeout_duration;
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Genode::List<Timeout> _timeout_list {};
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void _start_one_shot(time_t const ticks);
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time_t _value();
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time_t _max_value() const;
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time_t _duration() const;
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public:
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Timer(Cpu & cpu);
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void schedule_timeout();
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void process_timeouts();
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void set_timeout(Timeout * const timeout, time_t const duration);
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time_t us_to_ticks(time_t const us) const;
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time_t ticks_to_us(time_t const ticks) const;
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time_t timeout_max_us() const;
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unsigned interrupt_id() const;
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static void init_cpu_local();
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time_t time() const { return _time + _duration(); }
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};
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#endif /* _CORE__KERNEL__TIMER_H_ */
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