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cdbd878a14
We were calibrating it to 260 instead of 250 ticks per second (being off by one for the 1/10th second calibration time), resulting in ticks of only ~3.6 ms instead of ~4ms. This gets us closer to ~4ms, but because the APIC isn't nearly as precise as e.g. HPET, it will only be a best effort. Then, use the higher precision reference timer to more accurately calculate how many ticks we actually get each second. Also the frequency calculation was off, causing a "Frequency too slow" error with VMware. Fixes some problems observed in #5539
73 lines
3.0 KiB
C++
73 lines
3.0 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/Types.h>
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#include <Kernel/Time/HPET.h>
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#include <Kernel/Time/HardwareTimer.h>
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namespace Kernel {
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class HPETComparator final : public HardwareTimer<IRQHandler> {
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friend class HPET;
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public:
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static NonnullRefPtr<HPETComparator> create(u8 number, u8 irq, bool periodic_capable);
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virtual HardwareTimerType timer_type() const override { return HardwareTimerType::HighPrecisionEventTimer; }
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virtual const char* model() const override { return "HPET"; }
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u8 comparator_number() const { return m_comparator_number; }
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bool is_enabled() const { return m_enabled; }
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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 m_periodic_capable; }
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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 bool can_query_raw() const override { return true; }
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virtual u64 current_raw() const override;
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virtual u64 raw_to_ns(u64) const 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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void set_new_countdown();
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virtual void handle_irq(const RegisterState&) override;
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HPETComparator(u8 number, u8 irq, bool periodic_capable);
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bool m_periodic : 1;
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bool m_periodic_capable : 1;
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bool m_enabled : 1;
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u8 m_comparator_number { 0 };
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};
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}
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