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bbe1d7e239
This reverts commit af22204488.
According to the HPET specification, each theoretical comparator takes
32 bytes in the MMIO space.
Although I hardly believe that any system will implement all 32
comparators, in practice if a machine happens to have more than 3
comparators, we need to address the comparators correctly if we want to
use them.
102 lines
3.6 KiB
C++
102 lines
3.6 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/NonnullRefPtrVector.h>
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#include <AK/OwnPtr.h>
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#include <AK/Types.h>
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#include <AK/Vector.h>
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#include <Kernel/PhysicalAddress.h>
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#include <Kernel/VM/Region.h>
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namespace Kernel {
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class HPETComparator;
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struct HPETRegistersBlock;
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class HPET {
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public:
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static bool initialized();
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static bool test_and_initialize();
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static bool check_for_exisiting_periodic_timers();
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static HPET& the();
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u64 frequency() const { return m_frequency; }
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u64 raw_counter_ticks_to_ns(u64) const;
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u64 ns_to_raw_counter_ticks(u64) const;
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const NonnullRefPtrVector<HPETComparator>& comparators() const { return m_comparators; }
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void disable(const HPETComparator&);
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void enable(const HPETComparator&);
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void update_periodic_comparator_value();
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void update_non_periodic_comparator_value(const HPETComparator& comparator);
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void set_comparator_irq_vector(u8 comparator_number, u8 irq_vector);
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void enable_periodic_interrupt(const HPETComparator& comparator);
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void disable_periodic_interrupt(const HPETComparator& comparator);
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u64 update_time(u64& seconds_since_boot, u32& ticks_this_second, bool query_only);
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u64 read_main_counter_unsafe() const;
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u64 read_main_counter() const;
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Vector<unsigned> capable_interrupt_numbers(u8 comparator_number);
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Vector<unsigned> capable_interrupt_numbers(const HPETComparator&);
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private:
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const HPETRegistersBlock& registers() const;
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HPETRegistersBlock& registers();
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void global_disable();
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void global_enable();
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bool is_periodic_capable(u8 comparator_number) const;
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void set_comparators_to_optimal_interrupt_state(size_t timers_count);
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u64 nanoseconds_to_raw_ticks() const;
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PhysicalAddress find_acpi_hpet_registers_block();
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explicit HPET(PhysicalAddress acpi_hpet);
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PhysicalAddress m_physical_acpi_hpet_table;
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PhysicalAddress m_physical_acpi_hpet_registers;
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OwnPtr<Region> m_hpet_mmio_region;
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u64 m_main_counter_last_read { 0 };
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u64 m_main_counter_drift { 0 };
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u16 m_vendor_id;
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u16 m_minimum_tick;
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u64 m_frequency;
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u8 m_revision_id;
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bool counter_is_64_bit_capable : 1;
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bool legacy_replacement_route_capable : 1;
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NonnullRefPtrVector<HPETComparator> m_comparators;
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};
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}
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