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/*
* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/NonnullRefPtrVector.h>
#include <AK/RefPtr.h>
#include <AK/Types.h>
#include <Kernel/KResult.h>
#include <Kernel/UnixTypes.h>
namespace Kernel {
#define OPTIMAL_TICKS_PER_SECOND_RATE 250
class HardwareTimerBase;
enum class TimePrecision {
Coarse = 0,
Precise
};
class TimeManagement {
AK_MAKE_ETERNAL;
public:
TimeManagement();
static bool initialized();
static void initialize(u32 cpu);
static TimeManagement& the();
static bool is_valid_clock_id(clockid_t);
KResultOr<timespec> current_time(clockid_t) const;
timespec monotonic_time(TimePrecision = TimePrecision::Coarse) const;
timespec monotonic_time_raw() const
{
// TODO: implement
return monotonic_time(TimePrecision::Precise);
}
timespec epoch_time(TimePrecision = TimePrecision::Precise) const;
void set_epoch_time(timespec);
time_t ticks_per_second() const;
time_t boot_time() const;
bool is_system_timer(const HardwareTimerBase&) const;
static void update_time(const RegisterState&);
static void update_time_hpet(const RegisterState&);
void increment_time_since_boot_hpet();
void increment_time_since_boot();
static bool is_hpet_periodic_mode_allowed();
u64 uptime_ms() const;
static timeval now_as_timeval();
timespec remaining_epoch_time_adjustment() const { return m_remaining_epoch_time_adjustment; }
void set_remaining_epoch_time_adjustment(const timespec& adjustment) { m_remaining_epoch_time_adjustment = adjustment; }
private:
bool probe_and_set_legacy_hardware_timers();
bool probe_and_set_non_legacy_hardware_timers();
Vector<HardwareTimerBase*> scan_and_initialize_periodic_timers();
Vector<HardwareTimerBase*> scan_for_non_periodic_timers();
NonnullRefPtrVector<HardwareTimerBase> m_hardware_timers;
void set_system_timer(HardwareTimerBase&);
static void system_timer_tick(const RegisterState&);
// Variables between m_update1 and m_update2 are synchronized
Atomic<u32> m_update1 { 0 };
u32 m_ticks_this_second { 0 };
u64 m_seconds_since_boot { 0 };
timespec m_epoch_time { 0, 0 };
timespec m_remaining_epoch_time_adjustment { 0, 0 };
Atomic<u32> m_update2 { 0 };
u32 m_time_ticks_per_second { 0 }; // may be different from interrupts/second (e.g. hpet)
bool m_can_query_precise_time { false };
RefPtr<HardwareTimerBase> m_system_timer;
RefPtr<HardwareTimerBase> m_time_keeper_timer;
};
}
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