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75 lines
2.8 KiB
C++
75 lines
2.8 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/Function.h>
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#include <AK/RefCounted.h>
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#include <AK/String.h>
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#include <Kernel/Interrupts/IRQHandler.h>
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#include <Kernel/Time/TimeManagement.h>
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namespace Kernel {
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enum class HardwareTimerType {
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i8253 = 0x1, /* PIT */
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RTC = 0x2, /* Real Time Clock */
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HighPrecisionEventTimer = 0x3 /* also known as IA-PC HPET */
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};
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class HardwareTimer
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: public RefCounted<HardwareTimer>
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, public IRQHandler {
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public:
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virtual HardwareTimerType timer_type() const = 0;
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virtual const char* model() const = 0;
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virtual const char* purpose() const override;
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void set_callback(Function<void(const RegisterState&)>);
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virtual size_t ticks_per_second() const = 0;
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virtual bool is_periodic() const = 0;
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virtual bool is_periodic_capable() const = 0;
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virtual void set_periodic() = 0;
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virtual void set_non_periodic() = 0;
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virtual void reset_to_default_ticks_per_second() = 0;
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virtual bool try_to_set_frequency(size_t frequency) = 0;
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virtual bool is_capable_of_frequency(size_t frequency) const = 0;
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virtual size_t calculate_nearest_possible_frequency(size_t frequency) const = 0;
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protected:
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HardwareTimer(u8 irq_number, Function<void(const RegisterState&)> = nullptr);
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//^IRQHandler
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virtual void handle_irq(const RegisterState&) override;
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u64 m_frequency { OPTIMAL_TICKS_PER_SECOND_RATE };
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private:
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Function<void(const RegisterState&)> m_callback;
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};
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}
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