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https://github.com/RGBCube/serenity
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5d180d1f99
(...and ASSERT_NOT_REACHED => VERIFY_NOT_REACHED) Since all of these checks are done in release builds as well, let's rename them to VERIFY to prevent confusion, as everyone is used to assertions being compiled out in release. We can introduce a new ASSERT macro that is specifically for debug checks, but I'm doing this wholesale conversion first since we've accumulated thousands of these already, and it's not immediately obvious which ones are suitable for ASSERT.
139 lines
4.5 KiB
C++
139 lines
4.5 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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#include <Kernel/Assertions.h>
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#include <Kernel/Debug.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)
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{
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return adopt(*new HPETComparator(number, irq, periodic_capable));
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}
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UNMAP_AFTER_INIT HPETComparator::HPETComparator(u8 number, u8 irq, bool periodic_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_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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void HPETComparator::handle_irq(const RegisterState& regs)
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{
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HardwareTimer::handle_irq(regs);
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if (!is_periodic())
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set_new_countdown();
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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 cable 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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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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}
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