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d5bb5d109b
* Change the register structures to use the volatile keyword explicitly on the register values. This avoids accidentally omitting it as any access will be guaranteed volatile. * Don't assume we can read/write 64 bit value to the main counter and the comparator. Not all HPET implementations may support this. So, just use 32 bit words to access the registers. This ultimately works around a bug in Bochs 2.6.11 that loses 32 bits of a 64 bit write to a timer's comparator register (it internally writes one half and clears the Tn_VAL_SET_CNF bit, and then because it's cleared it fails to write the second half). * Properly calculate the tick duration in calculate_ticks_in_nanoseconds * As per specification, changing the frequency of one periodic timer requires a restart of all periodic timers as it requires the main counter to be reset.
93 lines
3.3 KiB
C++
93 lines
3.3 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;
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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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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 calculate_ticks_in_nanoseconds() 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_clock_period { 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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