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genode/repos/base-hw/src/core/kernel/timer.h

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hw: use kernel timer for timer driver * Adds public timeout syscalls to kernel API * Kernel::timeout installs a timeout and binds a signal context to it that shall trigger once the timeout expired * With Kernel::timeout_max_us, one can get the maximum installable timeout * Kernel::timeout_age_us returns the time that has passed since the calling threads last timeout installation * Removes all device specific back-ends for the base-hw timer driver and implements a generic back-end taht uses the kernel timeout API * Adds assertions about the kernel timer frequency that originate from the requirements of the the kernel timeout API and adjusts all timers accordingly by using the their internal dividers * Introduces the Kernel::Clock class. As member of each Kernel::Cpu object it combines the management of the timer of the CPU with a timeout scheduler. Not only the timeout API uses the timeout scheduler but also the CPUs job scheduler for installing scheduling timeouts. * Introduces the Kernel::time_t type for timer tic values and values inherited from timer tics (like microseconds). Fixes #1972
2016-05-18 12:20:04 +02:00
/*
hw core: merge Kernel::Clock and Kernel::Timer With this, we get rid of platform specific timer interfaces. The new Timer class does the same as the old Clock class and has a generic interface. The old Timer class was merely used by the old Clock class. Also, we get rid of having only one timer instance which we tell with each method call for which CPU it shall be done. Instead now each Cpu object has its own Timer member that knows the CPU it works for. Also, rename all "tics" to "ticks". Fixes #2347
2017-03-23 03:06:53 +01:00
* \brief A timer manages a continuous time and timeouts on it
hw: use kernel timer for timer driver * Adds public timeout syscalls to kernel API * Kernel::timeout installs a timeout and binds a signal context to it that shall trigger once the timeout expired * With Kernel::timeout_max_us, one can get the maximum installable timeout * Kernel::timeout_age_us returns the time that has passed since the calling threads last timeout installation * Removes all device specific back-ends for the base-hw timer driver and implements a generic back-end taht uses the kernel timeout API * Adds assertions about the kernel timer frequency that originate from the requirements of the the kernel timeout API and adjusts all timers accordingly by using the their internal dividers * Introduces the Kernel::Clock class. As member of each Kernel::Cpu object it combines the management of the timer of the CPU with a timeout scheduler. Not only the timeout API uses the timeout scheduler but also the CPUs job scheduler for installing scheduling timeouts. * Introduces the Kernel::time_t type for timer tic values and values inherited from timer tics (like microseconds). Fixes #1972
2016-05-18 12:20:04 +02:00
* \author Martin Stein
* \date 2016-03-23
*/
/*
Adjust file headers to refer to the AGPLv3
2017-02-20 13:23:52 +01:00
* Copyright (C) 2016-2017 Genode Labs GmbH
hw: use kernel timer for timer driver * Adds public timeout syscalls to kernel API * Kernel::timeout installs a timeout and binds a signal context to it that shall trigger once the timeout expired * With Kernel::timeout_max_us, one can get the maximum installable timeout * Kernel::timeout_age_us returns the time that has passed since the calling threads last timeout installation * Removes all device specific back-ends for the base-hw timer driver and implements a generic back-end taht uses the kernel timeout API * Adds assertions about the kernel timer frequency that originate from the requirements of the the kernel timeout API and adjusts all timers accordingly by using the their internal dividers * Introduces the Kernel::Clock class. As member of each Kernel::Cpu object it combines the management of the timer of the CPU with a timeout scheduler. Not only the timeout API uses the timeout scheduler but also the CPUs job scheduler for installing scheduling timeouts. * Introduces the Kernel::time_t type for timer tic values and values inherited from timer tics (like microseconds). Fixes #1972
2016-05-18 12:20:04 +02:00
*
* This file is part of the Genode OS framework, which is distributed
Adjust file headers to refer to the AGPLv3
2017-02-20 13:23:52 +01:00
* under the terms of the GNU Affero General Public License version 3.
hw: use kernel timer for timer driver * Adds public timeout syscalls to kernel API * Kernel::timeout installs a timeout and binds a signal context to it that shall trigger once the timeout expired * With Kernel::timeout_max_us, one can get the maximum installable timeout * Kernel::timeout_age_us returns the time that has passed since the calling threads last timeout installation * Removes all device specific back-ends for the base-hw timer driver and implements a generic back-end taht uses the kernel timeout API * Adds assertions about the kernel timer frequency that originate from the requirements of the the kernel timeout API and adjusts all timers accordingly by using the their internal dividers * Introduces the Kernel::Clock class. As member of each Kernel::Cpu object it combines the management of the timer of the CPU with a timeout scheduler. Not only the timeout API uses the timeout scheduler but also the CPUs job scheduler for installing scheduling timeouts. * Introduces the Kernel::time_t type for timer tic values and values inherited from timer tics (like microseconds). Fixes #1972
2016-05-18 12:20:04 +02:00
*/
hw core: merge Kernel::Clock and Kernel::Timer With this, we get rid of platform specific timer interfaces. The new Timer class does the same as the old Clock class and has a generic interface. The old Timer class was merely used by the old Clock class. Also, we get rid of having only one timer instance which we tell with each method call for which CPU it shall be done. Instead now each Cpu object has its own Timer member that knows the CPU it works for. Also, rename all "tics" to "ticks". Fixes #2347
2017-03-23 03:06:53 +01:00
#ifndef _CORE__KERNEL__TIMER_H_
#define _CORE__KERNEL__TIMER_H_
hw: use kernel timer for timer driver * Adds public timeout syscalls to kernel API * Kernel::timeout installs a timeout and binds a signal context to it that shall trigger once the timeout expired * With Kernel::timeout_max_us, one can get the maximum installable timeout * Kernel::timeout_age_us returns the time that has passed since the calling threads last timeout installation * Removes all device specific back-ends for the base-hw timer driver and implements a generic back-end taht uses the kernel timeout API * Adds assertions about the kernel timer frequency that originate from the requirements of the the kernel timeout API and adjusts all timers accordingly by using the their internal dividers * Introduces the Kernel::Clock class. As member of each Kernel::Cpu object it combines the management of the timer of the CPU with a timeout scheduler. Not only the timeout API uses the timeout scheduler but also the CPUs job scheduler for installing scheduling timeouts. * Introduces the Kernel::time_t type for timer tic values and values inherited from timer tics (like microseconds). Fixes #1972
2016-05-18 12:20:04 +02:00
/* base-hw includes */
#include <kernel/types.h>
/* Genode includes */
#include <util/list.h>
/* Core includes */
hw core: merge Kernel::Clock and Kernel::Timer With this, we get rid of platform specific timer interfaces. The new Timer class does the same as the old Clock class and has a generic interface. The old Timer class was merely used by the old Clock class. Also, we get rid of having only one timer instance which we tell with each method call for which CPU it shall be done. Instead now each Cpu object has its own Timer member that knows the CPU it works for. Also, rename all "tics" to "ticks". Fixes #2347
2017-03-23 03:06:53 +01:00
#include <timer_driver.h>
hw: use kernel timer for timer driver * Adds public timeout syscalls to kernel API * Kernel::timeout installs a timeout and binds a signal context to it that shall trigger once the timeout expired * With Kernel::timeout_max_us, one can get the maximum installable timeout * Kernel::timeout_age_us returns the time that has passed since the calling threads last timeout installation * Removes all device specific back-ends for the base-hw timer driver and implements a generic back-end taht uses the kernel timeout API * Adds assertions about the kernel timer frequency that originate from the requirements of the the kernel timeout API and adjusts all timers accordingly by using the their internal dividers * Introduces the Kernel::Clock class. As member of each Kernel::Cpu object it combines the management of the timer of the CPU with a timeout scheduler. Not only the timeout API uses the timeout scheduler but also the CPUs job scheduler for installing scheduling timeouts. * Introduces the Kernel::time_t type for timer tic values and values inherited from timer tics (like microseconds). Fixes #1972
2016-05-18 12:20:04 +02:00
namespace Kernel
{
class Timeout;
hw core: merge Kernel::Clock and Kernel::Timer With this, we get rid of platform specific timer interfaces. The new Timer class does the same as the old Clock class and has a generic interface. The old Timer class was merely used by the old Clock class. Also, we get rid of having only one timer instance which we tell with each method call for which CPU it shall be done. Instead now each Cpu object has its own Timer member that knows the CPU it works for. Also, rename all "tics" to "ticks". Fixes #2347
2017-03-23 03:06:53 +01:00
class Timer;
hw: use kernel timer for timer driver * Adds public timeout syscalls to kernel API * Kernel::timeout installs a timeout and binds a signal context to it that shall trigger once the timeout expired * With Kernel::timeout_max_us, one can get the maximum installable timeout * Kernel::timeout_age_us returns the time that has passed since the calling threads last timeout installation * Removes all device specific back-ends for the base-hw timer driver and implements a generic back-end taht uses the kernel timeout API * Adds assertions about the kernel timer frequency that originate from the requirements of the the kernel timeout API and adjusts all timers accordingly by using the their internal dividers * Introduces the Kernel::Clock class. As member of each Kernel::Cpu object it combines the management of the timer of the CPU with a timeout scheduler. Not only the timeout API uses the timeout scheduler but also the CPUs job scheduler for installing scheduling timeouts. * Introduces the Kernel::time_t type for timer tic values and values inherited from timer tics (like microseconds). Fixes #1972
2016-05-18 12:20:04 +02:00
}
/**
* A timeout causes a kernel pass and the call of a timeout specific handle
*/
class Kernel::Timeout : public Genode::List<Timeout>::Element
{
hw core: merge Kernel::Clock and Kernel::Timer With this, we get rid of platform specific timer interfaces. The new Timer class does the same as the old Clock class and has a generic interface. The old Timer class was merely used by the old Clock class. Also, we get rid of having only one timer instance which we tell with each method call for which CPU it shall be done. Instead now each Cpu object has its own Timer member that knows the CPU it works for. Also, rename all "tics" to "ticks". Fixes #2347
2017-03-23 03:06:53 +01:00
friend class Timer;
hw: use kernel timer for timer driver * Adds public timeout syscalls to kernel API * Kernel::timeout installs a timeout and binds a signal context to it that shall trigger once the timeout expired * With Kernel::timeout_max_us, one can get the maximum installable timeout * Kernel::timeout_age_us returns the time that has passed since the calling threads last timeout installation * Removes all device specific back-ends for the base-hw timer driver and implements a generic back-end taht uses the kernel timeout API * Adds assertions about the kernel timer frequency that originate from the requirements of the the kernel timeout API and adjusts all timers accordingly by using the their internal dividers * Introduces the Kernel::Clock class. As member of each Kernel::Cpu object it combines the management of the timer of the CPU with a timeout scheduler. Not only the timeout API uses the timeout scheduler but also the CPUs job scheduler for installing scheduling timeouts. * Introduces the Kernel::time_t type for timer tic values and values inherited from timer tics (like microseconds). Fixes #1972
2016-05-18 12:20:04 +02:00
private:
bool _listed = false;
hw: solve time overflow problem in clock Ref #2088
2016-09-07 14:39:14 +02:00
time_t _start;
time_t _end;
bool _end_period;
hw: use kernel timer for timer driver * Adds public timeout syscalls to kernel API * Kernel::timeout installs a timeout and binds a signal context to it that shall trigger once the timeout expired * With Kernel::timeout_max_us, one can get the maximum installable timeout * Kernel::timeout_age_us returns the time that has passed since the calling threads last timeout installation * Removes all device specific back-ends for the base-hw timer driver and implements a generic back-end taht uses the kernel timeout API * Adds assertions about the kernel timer frequency that originate from the requirements of the the kernel timeout API and adjusts all timers accordingly by using the their internal dividers * Introduces the Kernel::Clock class. As member of each Kernel::Cpu object it combines the management of the timer of the CPU with a timeout scheduler. Not only the timeout API uses the timeout scheduler but also the CPUs job scheduler for installing scheduling timeouts. * Introduces the Kernel::time_t type for timer tic values and values inherited from timer tics (like microseconds). Fixes #1972
2016-05-18 12:20:04 +02:00
public:
/**
* Callback handle
*/
virtual void timeout_triggered() { }
virtual ~Timeout() { }
};
/**
hw core: merge Kernel::Clock and Kernel::Timer With this, we get rid of platform specific timer interfaces. The new Timer class does the same as the old Clock class and has a generic interface. The old Timer class was merely used by the old Clock class. Also, we get rid of having only one timer instance which we tell with each method call for which CPU it shall be done. Instead now each Cpu object has its own Timer member that knows the CPU it works for. Also, rename all "tics" to "ticks". Fixes #2347
2017-03-23 03:06:53 +01:00
* A timer manages a continuous time and timeouts on it
hw: use kernel timer for timer driver * Adds public timeout syscalls to kernel API * Kernel::timeout installs a timeout and binds a signal context to it that shall trigger once the timeout expired * With Kernel::timeout_max_us, one can get the maximum installable timeout * Kernel::timeout_age_us returns the time that has passed since the calling threads last timeout installation * Removes all device specific back-ends for the base-hw timer driver and implements a generic back-end taht uses the kernel timeout API * Adds assertions about the kernel timer frequency that originate from the requirements of the the kernel timeout API and adjusts all timers accordingly by using the their internal dividers * Introduces the Kernel::Clock class. As member of each Kernel::Cpu object it combines the management of the timer of the CPU with a timeout scheduler. Not only the timeout API uses the timeout scheduler but also the CPUs job scheduler for installing scheduling timeouts. * Introduces the Kernel::time_t type for timer tic values and values inherited from timer tics (like microseconds). Fixes #1972
2016-05-18 12:20:04 +02:00
*/
hw core: merge Kernel::Clock and Kernel::Timer With this, we get rid of platform specific timer interfaces. The new Timer class does the same as the old Clock class and has a generic interface. The old Timer class was merely used by the old Clock class. Also, we get rid of having only one timer instance which we tell with each method call for which CPU it shall be done. Instead now each Cpu object has its own Timer member that knows the CPU it works for. Also, rename all "tics" to "ticks". Fixes #2347
2017-03-23 03:06:53 +01:00
class Kernel::Timer
hw: use kernel timer for timer driver * Adds public timeout syscalls to kernel API * Kernel::timeout installs a timeout and binds a signal context to it that shall trigger once the timeout expired * With Kernel::timeout_max_us, one can get the maximum installable timeout * Kernel::timeout_age_us returns the time that has passed since the calling threads last timeout installation * Removes all device specific back-ends for the base-hw timer driver and implements a generic back-end taht uses the kernel timeout API * Adds assertions about the kernel timer frequency that originate from the requirements of the the kernel timeout API and adjusts all timers accordingly by using the their internal dividers * Introduces the Kernel::Clock class. As member of each Kernel::Cpu object it combines the management of the timer of the CPU with a timeout scheduler. Not only the timeout API uses the timeout scheduler but also the CPUs job scheduler for installing scheduling timeouts. * Introduces the Kernel::time_t type for timer tic values and values inherited from timer tics (like microseconds). Fixes #1972
2016-05-18 12:20:04 +02:00
{
private:
hw core: merge Kernel::Clock and Kernel::Timer With this, we get rid of platform specific timer interfaces. The new Timer class does the same as the old Clock class and has a generic interface. The old Timer class was merely used by the old Clock class. Also, we get rid of having only one timer instance which we tell with each method call for which CPU it shall be done. Instead now each Cpu object has its own Timer member that knows the CPU it works for. Also, rename all "tics" to "ticks". Fixes #2347
2017-03-23 03:06:53 +01:00
using Driver = Timer_driver;
hw: use kernel timer for timer driver * Adds public timeout syscalls to kernel API * Kernel::timeout installs a timeout and binds a signal context to it that shall trigger once the timeout expired * With Kernel::timeout_max_us, one can get the maximum installable timeout * Kernel::timeout_age_us returns the time that has passed since the calling threads last timeout installation * Removes all device specific back-ends for the base-hw timer driver and implements a generic back-end taht uses the kernel timeout API * Adds assertions about the kernel timer frequency that originate from the requirements of the the kernel timeout API and adjusts all timers accordingly by using the their internal dividers * Introduces the Kernel::Clock class. As member of each Kernel::Cpu object it combines the management of the timer of the CPU with a timeout scheduler. Not only the timeout API uses the timeout scheduler but also the CPUs job scheduler for installing scheduling timeouts. * Introduces the Kernel::time_t type for timer tic values and values inherited from timer tics (like microseconds). Fixes #1972
2016-05-18 12:20:04 +02:00
unsigned const _cpu_id;
hw core: merge Kernel::Clock and Kernel::Timer With this, we get rid of platform specific timer interfaces. The new Timer class does the same as the old Clock class and has a generic interface. The old Timer class was merely used by the old Clock class. Also, we get rid of having only one timer instance which we tell with each method call for which CPU it shall be done. Instead now each Cpu object has its own Timer member that knows the CPU it works for. Also, rename all "tics" to "ticks". Fixes #2347
2017-03-23 03:06:53 +01:00
Driver _driver;
hw: use kernel timer for timer driver * Adds public timeout syscalls to kernel API * Kernel::timeout installs a timeout and binds a signal context to it that shall trigger once the timeout expired * With Kernel::timeout_max_us, one can get the maximum installable timeout * Kernel::timeout_age_us returns the time that has passed since the calling threads last timeout installation * Removes all device specific back-ends for the base-hw timer driver and implements a generic back-end taht uses the kernel timeout API * Adds assertions about the kernel timer frequency that originate from the requirements of the the kernel timeout API and adjusts all timers accordingly by using the their internal dividers * Introduces the Kernel::Clock class. As member of each Kernel::Cpu object it combines the management of the timer of the CPU with a timeout scheduler. Not only the timeout API uses the timeout scheduler but also the CPUs job scheduler for installing scheduling timeouts. * Introduces the Kernel::time_t type for timer tic values and values inherited from timer tics (like microseconds). Fixes #1972
2016-05-18 12:20:04 +02:00
time_t _time = 0;
hw: solve time overflow problem in clock Ref #2088
2016-09-07 14:39:14 +02:00
bool _time_period = false;
Genode::List<Timeout> _timeout_list[2];
hw: use kernel timer for timer driver * Adds public timeout syscalls to kernel API * Kernel::timeout installs a timeout and binds a signal context to it that shall trigger once the timeout expired * With Kernel::timeout_max_us, one can get the maximum installable timeout * Kernel::timeout_age_us returns the time that has passed since the calling threads last timeout installation * Removes all device specific back-ends for the base-hw timer driver and implements a generic back-end taht uses the kernel timeout API * Adds assertions about the kernel timer frequency that originate from the requirements of the the kernel timeout API and adjusts all timers accordingly by using the their internal dividers * Introduces the Kernel::Clock class. As member of each Kernel::Cpu object it combines the management of the timer of the CPU with a timeout scheduler. Not only the timeout API uses the timeout scheduler but also the CPUs job scheduler for installing scheduling timeouts. * Introduces the Kernel::time_t type for timer tic values and values inherited from timer tics (like microseconds). Fixes #1972
2016-05-18 12:20:04 +02:00
time_t _last_timeout_duration = 0;
hw: solve time overflow problem in clock Ref #2088
2016-09-07 14:39:14 +02:00
bool _time_overflow(time_t const duration) const;
hw: use kernel timer for timer driver * Adds public timeout syscalls to kernel API * Kernel::timeout installs a timeout and binds a signal context to it that shall trigger once the timeout expired * With Kernel::timeout_max_us, one can get the maximum installable timeout * Kernel::timeout_age_us returns the time that has passed since the calling threads last timeout installation * Removes all device specific back-ends for the base-hw timer driver and implements a generic back-end taht uses the kernel timeout API * Adds assertions about the kernel timer frequency that originate from the requirements of the the kernel timeout API and adjusts all timers accordingly by using the their internal dividers * Introduces the Kernel::Clock class. As member of each Kernel::Cpu object it combines the management of the timer of the CPU with a timeout scheduler. Not only the timeout API uses the timeout scheduler but also the CPUs job scheduler for installing scheduling timeouts. * Introduces the Kernel::time_t type for timer tic values and values inherited from timer tics (like microseconds). Fixes #1972
2016-05-18 12:20:04 +02:00
hw core: merge Kernel::Clock and Kernel::Timer With this, we get rid of platform specific timer interfaces. The new Timer class does the same as the old Clock class and has a generic interface. The old Timer class was merely used by the old Clock class. Also, we get rid of having only one timer instance which we tell with each method call for which CPU it shall be done. Instead now each Cpu object has its own Timer member that knows the CPU it works for. Also, rename all "tics" to "ticks". Fixes #2347
2017-03-23 03:06:53 +01:00
void _start_one_shot(time_t const ticks);
time_t _ticks_to_us(time_t const ticks) const;
time_t _value();
time_t _max_value() const;
hw: use kernel timer for timer driver * Adds public timeout syscalls to kernel API * Kernel::timeout installs a timeout and binds a signal context to it that shall trigger once the timeout expired * With Kernel::timeout_max_us, one can get the maximum installable timeout * Kernel::timeout_age_us returns the time that has passed since the calling threads last timeout installation * Removes all device specific back-ends for the base-hw timer driver and implements a generic back-end taht uses the kernel timeout API * Adds assertions about the kernel timer frequency that originate from the requirements of the the kernel timeout API and adjusts all timers accordingly by using the their internal dividers * Introduces the Kernel::Clock class. As member of each Kernel::Cpu object it combines the management of the timer of the CPU with a timeout scheduler. Not only the timeout API uses the timeout scheduler but also the CPUs job scheduler for installing scheduling timeouts. * Introduces the Kernel::time_t type for timer tic values and values inherited from timer tics (like microseconds). Fixes #1972
2016-05-18 12:20:04 +02:00
public:
hw core: merge Kernel::Clock and Kernel::Timer With this, we get rid of platform specific timer interfaces. The new Timer class does the same as the old Clock class and has a generic interface. The old Timer class was merely used by the old Clock class. Also, we get rid of having only one timer instance which we tell with each method call for which CPU it shall be done. Instead now each Cpu object has its own Timer member that knows the CPU it works for. Also, rename all "tics" to "ticks". Fixes #2347
2017-03-23 03:06:53 +01:00
Timer(unsigned cpu_id);
hw: use kernel timer for timer driver * Adds public timeout syscalls to kernel API * Kernel::timeout installs a timeout and binds a signal context to it that shall trigger once the timeout expired * With Kernel::timeout_max_us, one can get the maximum installable timeout * Kernel::timeout_age_us returns the time that has passed since the calling threads last timeout installation * Removes all device specific back-ends for the base-hw timer driver and implements a generic back-end taht uses the kernel timeout API * Adds assertions about the kernel timer frequency that originate from the requirements of the the kernel timeout API and adjusts all timers accordingly by using the their internal dividers * Introduces the Kernel::Clock class. As member of each Kernel::Cpu object it combines the management of the timer of the CPU with a timeout scheduler. Not only the timeout API uses the timeout scheduler but also the CPUs job scheduler for installing scheduling timeouts. * Introduces the Kernel::time_t type for timer tic values and values inherited from timer tics (like microseconds). Fixes #1972
2016-05-18 12:20:04 +02:00
void schedule_timeout();
time_t update_time();
void process_timeouts();
void set_timeout(Timeout * const timeout, time_t const duration);
hw core: merge Kernel::Clock and Kernel::Timer With this, we get rid of platform specific timer interfaces. The new Timer class does the same as the old Clock class and has a generic interface. The old Timer class was merely used by the old Clock class. Also, we get rid of having only one timer instance which we tell with each method call for which CPU it shall be done. Instead now each Cpu object has its own Timer member that knows the CPU it works for. Also, rename all "tics" to "ticks". Fixes #2347
2017-03-23 03:06:53 +01:00
time_t us_to_ticks(time_t const us) const;
hw: use kernel timer for timer driver * Adds public timeout syscalls to kernel API * Kernel::timeout installs a timeout and binds a signal context to it that shall trigger once the timeout expired * With Kernel::timeout_max_us, one can get the maximum installable timeout * Kernel::timeout_age_us returns the time that has passed since the calling threads last timeout installation * Removes all device specific back-ends for the base-hw timer driver and implements a generic back-end taht uses the kernel timeout API * Adds assertions about the kernel timer frequency that originate from the requirements of the the kernel timeout API and adjusts all timers accordingly by using the their internal dividers * Introduces the Kernel::Clock class. As member of each Kernel::Cpu object it combines the management of the timer of the CPU with a timeout scheduler. Not only the timeout API uses the timeout scheduler but also the CPUs job scheduler for installing scheduling timeouts. * Introduces the Kernel::time_t type for timer tic values and values inherited from timer tics (like microseconds). Fixes #1972
2016-05-18 12:20:04 +02:00
time_t timeout_age_us(Timeout const * const timeout) const;
time_t timeout_max_us() const;
hw core: merge Kernel::Clock and Kernel::Timer With this, we get rid of platform specific timer interfaces. The new Timer class does the same as the old Clock class and has a generic interface. The old Timer class was merely used by the old Clock class. Also, we get rid of having only one timer instance which we tell with each method call for which CPU it shall be done. Instead now each Cpu object has its own Timer member that knows the CPU it works for. Also, rename all "tics" to "ticks". Fixes #2347
2017-03-23 03:06:53 +01:00
unsigned interrupt_id() const;
static void init_cpu_local();
os/timer: interpolate time via timestamps Previously, the Genode::Timer::curr_time always used the Timer_session::elapsed_ms RPC as back end. Now, Genode::Timer reads this remote time only in a periodic fashion independently from the calls to Genode::Timer::curr_time. If now one calls Genode::Timer::curr_time, the function takes the last read remote time value and adapts it using the timestamp difference since the remote-time read. The conversion factor from timestamps to time is estimated on every remote-time read using the last read remote-time value and the timestamp difference since the last remote time read. This commit also re-works the timeout test. The test now has two stages. In the first stage, it tests fast polling of the Genode::Timer::curr_time. This stage checks the error between locally interpolated and timer-driver time as well as wether the locally interpolated time is monotone and sufficiently homogeneous. In the second stage several periodic and one-shot timeouts are scheduled at once. This stage checks if the timeouts trigger sufficiently precise. This commit adds the new Kernel::time syscall to base-hw. The syscall is solely used by the Genode::Timer on base-hw as substitute for the timestamp. This is because on ARM, the timestamp function uses the ARM performance counter that stops counting when the WFI (wait for interrupt) instruction is active. This instruction, however is used by the base-hw idle contexts that get active when no user thread needs to be scheduled. Thus, the ARM performance counter is not a good choice for time interpolation and we use the kernel internal time instead. With this commit, the timeout library becomes a basic library. That means that it is linked against the LDSO which then provides it to the program it serves. Furthermore, you can't use the timeout library anymore without the LDSO because through the kernel-dependent LDSO make-files we can achieve a kernel-dependent timeout implementation. This commit introduces a structured Duration type that shall successively replace the use of Microseconds, Milliseconds, and integer types for duration values. Open issues: * The timeout test fails on Raspberry PI because of precision errors in the first stage. However, this does not render the framework unusable in general on the RPI but merely is an issue when speaking of microseconds precision. * If we run on ARM with another Kernel than HW the timestamp speed may continuously vary from almost 0 up to CPU speed. The Timer, however, only uses interpolation if the timestamp speed remained stable (12.5% tolerance) for at least 3 observation periods. Currently, one period is 100ms, so its 300ms. As long as this is not the case, Timer_session::elapsed_ms is called instead. Anyway, it might happen that the CPU load was stable for some time so interpolation becomes active and now the timestamp speed drops. In the worst case, we would now have 100ms of slowed down time. The bad thing about it would be, that this also affects the timeout of the period. Thus, it might "freeze" the local time for more than 100ms. On the other hand, if the timestamp speed suddenly raises after some stable time, interpolated time can get too fast. This would shorten the period but nonetheless may result in drifting away into the far future. Now we would have the problem that we can't deliver the real time anymore until it has caught up because the output of Timer::curr_time shall be monotone. So, effectively local time might "freeze" again for more than 100ms. It would be a solution to not use the Trace::timestamp on ARM w/o HW but a function whose return value causes the Timer to never use interpolation because of its stability policy. Fixes #2400
2017-04-22 00:52:23 +02:00
time_t time() const { return _time; }
hw: use kernel timer for timer driver * Adds public timeout syscalls to kernel API * Kernel::timeout installs a timeout and binds a signal context to it that shall trigger once the timeout expired * With Kernel::timeout_max_us, one can get the maximum installable timeout * Kernel::timeout_age_us returns the time that has passed since the calling threads last timeout installation * Removes all device specific back-ends for the base-hw timer driver and implements a generic back-end taht uses the kernel timeout API * Adds assertions about the kernel timer frequency that originate from the requirements of the the kernel timeout API and adjusts all timers accordingly by using the their internal dividers * Introduces the Kernel::Clock class. As member of each Kernel::Cpu object it combines the management of the timer of the CPU with a timeout scheduler. Not only the timeout API uses the timeout scheduler but also the CPUs job scheduler for installing scheduling timeouts. * Introduces the Kernel::time_t type for timer tic values and values inherited from timer tics (like microseconds). Fixes #1972
2016-05-18 12:20:04 +02:00
};
hw core: merge Kernel::Clock and Kernel::Timer With this, we get rid of platform specific timer interfaces. The new Timer class does the same as the old Clock class and has a generic interface. The old Timer class was merely used by the old Clock class. Also, we get rid of having only one timer instance which we tell with each method call for which CPU it shall be done. Instead now each Cpu object has its own Timer member that knows the CPU it works for. Also, rename all "tics" to "ticks". Fixes #2347
2017-03-23 03:06:53 +01:00
#endif /* _CORE__KERNEL__TIMER_H_ */
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