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/*
* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Error.h>
#include <AK/NonnullRefPtrVector.h>
#include <AK/OwnPtr.h>
#include <AK/RefPtr.h>
#include <AK/Time.h>
#include <AK/Types.h>
#include <Kernel/API/TimePage.h>
#include <Kernel/Arch/RegisterState.h>
#include <Kernel/UnixTypes.h>
namespace Kernel {
#define OPTIMAL_TICKS_PER_SECOND_RATE 250
#define OPTIMAL_PROFILE_TICKS_PER_SECOND_RATE 1000
class HardwareTimerBase;
enum class TimePrecision {
Coarse = 0,
Precise
};
class TimeManagement {
public:
TimeManagement();
static void initialize(u32 cpu);
static bool is_initialized();
static TimeManagement& the();
static ErrorOr<void> validate_clock_id(clockid_t);
Time current_time(clockid_t) const;
Time monotonic_time(TimePrecision = TimePrecision::Coarse) const;
Time monotonic_time_raw() const
{
// TODO: implement
return monotonic_time(TimePrecision::Precise);
}
Time epoch_time(TimePrecision = TimePrecision::Precise) const;
void set_epoch_time(Time);
time_t ticks_per_second() const;
time_t boot_time() const;
bool is_system_timer(HardwareTimerBase const&) const;
static void update_time(RegisterState const&);
static void update_time_hpet(RegisterState const&);
void increment_time_since_boot_hpet();
void increment_time_since_boot();
static bool is_hpet_periodic_mode_allowed();
bool enable_profile_timer();
bool disable_profile_timer();
u64 uptime_ms() const;
static Time now();
// FIXME: Should use AK::Time internally
// FIXME: Also, most likely broken, because it does not check m_update[12] for in-progress updates.
timespec remaining_epoch_time_adjustment() const { return m_remaining_epoch_time_adjustment; }
// FIXME: Should use AK::Time internally
// FIXME: Also, most likely broken, because it does not check m_update[12] for in-progress updates.
void set_remaining_epoch_time_adjustment(timespec const& adjustment) { m_remaining_epoch_time_adjustment = adjustment; }
bool can_query_precise_time() const { return m_can_query_precise_time; }
Memory::VMObject& time_page_vmobject();
private:
TimePage& time_page();
void update_time_page();
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(RegisterState const&);
static u64 scheduling_current_time(bool);
// 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 };
// FIXME: Should use AK::Time internally
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 };
bool m_updating_time { false }; // may only be accessed from the BSP!
RefPtr<HardwareTimerBase> m_system_timer;
RefPtr<HardwareTimerBase> m_time_keeper_timer;
Atomic<u32> m_profile_enable_count { 0 };
RefPtr<HardwareTimerBase> m_profile_timer;
NonnullOwnPtr<Memory::Region> m_time_page_region;
};
}
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