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https://github.com/RGBCube/serenity
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fe2bd8e3dd
The APICTimer, HPET and RTC (the RTC timer is in the context of the PC RTC here) are timers that exist only in x86 platforms, therefore, we move the handling code and the initialization code to the Arch/x86/Time directory. Other related code patterns in the TimeManagement singleton and in the Random.cpp file are guarded with #ifdef to ensure they are only compiled for x86 builds.
57 lines
1.6 KiB
C++
57 lines
1.6 KiB
C++
/*
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* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Types.h>
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#include <Kernel/Library/NonnullLockRefPtr.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<IRQHandler> {
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public:
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static NonnullLockRefPtr<PIT> initialize(Function<void(RegisterState const&)>);
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virtual HardwareTimerType timer_type() const override { return HardwareTimerType::i8253; }
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virtual StringView model() const override { return "i8254"sv; }
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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 disable() 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(RegisterState const&)>);
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bool m_periodic { true };
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};
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}
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