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77 lines
2.8 KiB
C
77 lines
2.8 KiB
C
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/*
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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/NonnullRefPtr.h>
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#include <AK/Types.h>
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#include <Kernel/Time/HardwareTimer.h>
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namespace Kernel {
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/* Timer related ports */
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#define TIMER0_CTL 0x40
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#define TIMER1_CTL 0x41
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#define TIMER2_CTL 0x42
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#define PIT_CTL 0x43
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/* Building blocks for PIT_CTL */
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#define TIMER0_SELECT 0x00
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#define TIMER1_SELECT 0x40
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#define TIMER2_SELECT 0x80
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#define MODE_COUNTDOWN 0x00
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#define MODE_ONESHOT 0x02
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#define MODE_RATE 0x04
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#define MODE_SQUARE_WAVE 0x06
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#define WRITE_WORD 0x30
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#define BASE_FREQUENCY 1193182
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class PIT final : public HardwareTimer {
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public:
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static NonnullRefPtr<PIT> initialize(Function<void(const RegisterState&)>);
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virtual HardwareTimerType timer_type() const override { return HardwareTimerType::i8253; }
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virtual const char* model() const override { return "i8254"; }
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virtual size_t ticks_per_second() const override;
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virtual bool is_periodic() const override { return m_periodic; }
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virtual bool is_periodic_capable() const override { return true; }
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virtual void set_periodic() override;
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virtual void set_non_periodic() override;
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virtual void reset_to_default_ticks_per_second() override;
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virtual bool try_to_set_frequency(size_t frequency) override;
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virtual bool is_capable_of_frequency(size_t frequency) const override;
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virtual size_t calculate_nearest_possible_frequency(size_t frequency) const override;
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private:
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explicit PIT(Function<void(const RegisterState&)>);
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bool m_periodic { true };
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};
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}
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