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/*
* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Function.h>
#include <AK/Types.h>
#include <Kernel/Time/HPET.h>
#include <Kernel/Time/HardwareTimer.h>
namespace Kernel {
class HPETComparator final : public HardwareTimer<IRQHandler> {
friend class HPET;
public:
static NonnullRefPtr<HPETComparator> create(u8 number, u8 irq, bool periodic_capable, bool is_64bit_capable);
virtual HardwareTimerType timer_type() const override { return HardwareTimerType::HighPrecisionEventTimer; }
virtual StringView model() const override { return "HPET"sv; }
u8 comparator_number() const { return m_comparator_number; }
bool is_enabled() const { return m_enabled; }
bool is_64bit_capable() const { return m_is_64bit_capable; }
virtual size_t ticks_per_second() const override;
virtual bool is_periodic() const override { return m_periodic; }
virtual bool is_periodic_capable() const override { return m_periodic_capable; }
virtual void set_periodic() override;
virtual void set_non_periodic() override;
virtual void disable() override;
virtual bool can_query_raw() const override { return true; }
virtual u64 current_raw() const override;
virtual u64 raw_to_ns(u64) const override;
virtual void reset_to_default_ticks_per_second() override;
virtual bool try_to_set_frequency(size_t frequency) override;
virtual bool is_capable_of_frequency(size_t frequency) const override;
virtual size_t calculate_nearest_possible_frequency(size_t frequency) const override;
private:
void set_new_countdown();
virtual bool handle_irq(const RegisterState&) override;
HPETComparator(u8 number, u8 irq, bool periodic_capable, bool is_64bit_capable);
bool m_periodic : 1;
bool m_periodic_capable : 1;
bool m_enabled : 1;
bool m_is_64bit_capable : 1;
u8 m_comparator_number { 0 };
};
}
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