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5f51d85184
This implements a number of changes related to time: * If a HPET is present, it is now used only as a system timer, unless the Local APIC timer is used (in which case the HPET timer will not trigger any interrupts at all). * If a HPET is present, the current time can now be as accurate as the chip can be, independently from the system timer. We now query the HPET main counter for the current time in CPU #0's system timer interrupt, and use that as a base line. If a high precision time is queried, that base line is used in combination with quering the HPET timer directly, which should give a much more accurate time stamp at the expense of more overhead. For faster time stamps, the more coarse value based on the last interrupt will be returned. This also means that any missed interrupts should not cause the time to drift. * The default system interrupt rate is reduced to about 250 per second. * Fix calculation of Thread CPU usage by using the amount of ticks they used rather than the number of times a context switch happened. * Implement CLOCK_REALTIME_COARSE and CLOCK_MONOTONIC_COARSE and use it for most cases where precise timestamps are not needed.
108 lines
3.8 KiB
C++
108 lines
3.8 KiB
C++
/*
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* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/NonnullRefPtrVector.h>
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#include <AK/RefPtr.h>
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#include <AK/Types.h>
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#include <Kernel/KResult.h>
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#include <Kernel/UnixTypes.h>
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namespace Kernel {
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#define OPTIMAL_TICKS_PER_SECOND_RATE 250
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class HardwareTimerBase;
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enum class TimePrecision {
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Coarse = 0,
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Precise
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};
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class TimeManagement {
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AK_MAKE_ETERNAL;
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public:
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TimeManagement();
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static bool initialized();
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static void initialize(u32 cpu);
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static TimeManagement& the();
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static bool is_valid_clock_id(clockid_t);
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KResultOr<timespec> current_time(clockid_t) const;
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timespec monotonic_time(TimePrecision = TimePrecision::Coarse) const;
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timespec monotonic_time_raw() const
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{
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// TODO: implement
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return monotonic_time(TimePrecision::Precise);
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}
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timespec epoch_time(TimePrecision = TimePrecision::Precise) const;
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void set_epoch_time(timespec);
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time_t ticks_per_second() const;
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time_t boot_time() const;
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bool is_system_timer(const HardwareTimerBase&) const;
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static void update_time(const RegisterState&);
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static void update_time_hpet(const RegisterState&);
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void increment_time_since_boot_hpet();
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void increment_time_since_boot();
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static bool is_hpet_periodic_mode_allowed();
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u64 uptime_ms() const;
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static timeval now_as_timeval();
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timespec remaining_epoch_time_adjustment() const { return m_remaining_epoch_time_adjustment; }
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void set_remaining_epoch_time_adjustment(const timespec& adjustment) { m_remaining_epoch_time_adjustment = adjustment; }
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private:
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bool probe_and_set_legacy_hardware_timers();
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bool probe_and_set_non_legacy_hardware_timers();
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Vector<HardwareTimerBase*> scan_and_initialize_periodic_timers();
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Vector<HardwareTimerBase*> scan_for_non_periodic_timers();
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NonnullRefPtrVector<HardwareTimerBase> m_hardware_timers;
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void set_system_timer(HardwareTimerBase&);
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static void system_timer_tick(const RegisterState&);
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// Variables between m_update1 and m_update2 are synchronized
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Atomic<u32> m_update1 { 0 };
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u32 m_ticks_this_second { 0 };
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u64 m_seconds_since_boot { 0 };
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timespec m_epoch_time { 0, 0 };
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timespec m_remaining_epoch_time_adjustment { 0, 0 };
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Atomic<u32> m_update2 { 0 };
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u32 m_time_ticks_per_second { 0 }; // may be different from interrupts/second (e.g. hpet)
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bool m_can_query_precise_time { false };
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RefPtr<HardwareTimerBase> m_system_timer;
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RefPtr<HardwareTimerBase> m_time_keeper_timer;
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};
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}
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