mirror of
https://github.com/RGBCube/serenity
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136 lines
3.7 KiB
C++
136 lines
3.7 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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#include <Kernel/Arch/x86/InterruptDisabler.h>
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#include <Kernel/Assertions.h>
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#include <Kernel/Debug.h>
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#include <Kernel/Sections.h>
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#include <Kernel/Time/HPETComparator.h>
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#include <Kernel/Time/TimeManagement.h>
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namespace Kernel {
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UNMAP_AFTER_INIT NonnullRefPtr<HPETComparator> HPETComparator::create(u8 number, u8 irq, bool periodic_capable, bool is_64bit_capable)
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{
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auto timer = adopt_ref(*new HPETComparator(number, irq, periodic_capable, is_64bit_capable));
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timer->register_interrupt_handler();
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return timer;
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}
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UNMAP_AFTER_INIT HPETComparator::HPETComparator(u8 number, u8 irq, bool periodic_capable, bool is_64bit_capable)
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: HardwareTimer(irq)
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, m_periodic(false)
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, m_periodic_capable(periodic_capable)
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, m_enabled(false)
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, m_is_64bit_capable(is_64bit_capable)
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, m_comparator_number(number)
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{
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}
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void HPETComparator::disable()
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{
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if (!m_enabled)
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return;
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m_enabled = false;
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HPET::the().disable(*this);
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}
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void HPETComparator::set_periodic()
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{
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VERIFY(m_periodic_capable);
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m_periodic = true;
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m_enabled = true;
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HPET::the().enable_periodic_interrupt(*this);
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}
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void HPETComparator::set_non_periodic()
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{
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VERIFY(m_periodic_capable);
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m_periodic = false;
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m_enabled = true;
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HPET::the().disable_periodic_interrupt(*this);
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}
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bool HPETComparator::handle_irq(const RegisterState& regs)
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{
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auto result = HardwareTimer::handle_irq(regs);
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if (!is_periodic())
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set_new_countdown();
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return result;
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}
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void HPETComparator::set_new_countdown()
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{
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VERIFY_INTERRUPTS_DISABLED();
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VERIFY(m_frequency <= HPET::the().frequency());
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HPET::the().update_non_periodic_comparator_value(*this);
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}
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size_t HPETComparator::ticks_per_second() const
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{
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return m_frequency;
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}
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void HPETComparator::reset_to_default_ticks_per_second()
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{
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dbgln("reset_to_default_ticks_per_second");
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m_frequency = OPTIMAL_TICKS_PER_SECOND_RATE;
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if (!is_periodic())
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set_new_countdown();
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else
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try_to_set_frequency(m_frequency);
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}
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bool HPETComparator::try_to_set_frequency(size_t frequency)
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{
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InterruptDisabler disabler;
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if (!is_capable_of_frequency(frequency)) {
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dbgln("HPETComparator: not capable of frequency: {}", frequency);
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return false;
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}
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auto hpet_frequency = HPET::the().frequency();
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VERIFY(frequency <= hpet_frequency);
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m_frequency = frequency;
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m_enabled = true;
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dbgln_if(HPET_COMPARATOR_DEBUG, "HPET Comparator: Max frequency {} Hz, want to set {} Hz, periodic: {}", hpet_frequency, frequency, is_periodic());
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if (is_periodic()) {
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HPET::the().update_periodic_comparator_value();
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} else {
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HPET::the().update_non_periodic_comparator_value(*this);
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}
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HPET::the().enable(*this);
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enable_irq(); // Enable if we haven't already
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return true;
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}
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bool HPETComparator::is_capable_of_frequency(size_t frequency) const
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{
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if (frequency > HPET::the().frequency())
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return false;
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// HPET::update_periodic_comparator_value and HPET::update_non_periodic_comparator_value
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// calculate the best counter based on the desired frequency.
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return true;
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}
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size_t HPETComparator::calculate_nearest_possible_frequency(size_t frequency) const
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{
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if (frequency > HPET::the().frequency())
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return HPET::the().frequency();
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// HPET::update_periodic_comparator_value and HPET::update_non_periodic_comparator_value
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// calculate the best counter based on the desired frequency.
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return frequency;
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}
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u64 HPETComparator::current_raw() const
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{
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return HPET::the().read_main_counter();
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}
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u64 HPETComparator::raw_to_ns(u64 raw_delta) const
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{
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return HPET::the().raw_counter_ticks_to_ns(raw_delta);
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}
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}
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