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3f9927b0c3
If the HPET main counter does not support full 64 bits, we should not expect the upper 32 bit to work. This is a problem when writing to the upper 32 bit of the comparator value, which requires the TimerConfiguration::ValueSet bit to be set, but if it's not 64 bit capable then the bit will not be cleared and leave it in a bad state. Fixes #6990
84 lines
2.4 KiB
C++
84 lines
2.4 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/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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bool is_64bit_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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u32 m_32bit_main_counter_wraps { 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 m_main_counter_64bits : 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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