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Kernel: Set up and calibrate APIC timer, and enable timer on all CPUs
This enables the APIC timer on all CPUs, which means Scheduler::timer_tick is now called on all CPUs independently. We still don't do anything on the APs as it instantly crashes due to a number of other problems.
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14 changed files with 478 additions and 70 deletions
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@ -35,37 +35,114 @@
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namespace Kernel {
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enum class HardwareTimerType {
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i8253 = 0x1, /* PIT */
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RTC = 0x2, /* Real Time Clock */
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HighPrecisionEventTimer = 0x3 /* also known as IA-PC HPET */
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i8253 = 0x1, /* PIT */
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RTC = 0x2, /* Real Time Clock */
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HighPrecisionEventTimer = 0x3, /* also known as IA-PC HPET */
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LocalAPICTimer = 0x4 /* Local APIC */
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};
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class HardwareTimer
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: public RefCounted<HardwareTimer>
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, public IRQHandler {
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template<typename InterruptHandlerType>
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class HardwareTimer;
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class HardwareTimerBase
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: public RefCounted<HardwareTimerBase> {
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public:
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virtual HardwareTimerType timer_type() const = 0;
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virtual ~HardwareTimerBase() { }
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virtual const char* model() const = 0;
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virtual const char* purpose() const override;
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void set_callback(Function<void(const RegisterState&)>);
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virtual size_t ticks_per_second() const = 0;
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virtual HardwareTimerType timer_type() const = 0;
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virtual Function<void(const RegisterState&)> set_callback(Function<void(const RegisterState&)>) = 0;
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virtual bool is_periodic() const = 0;
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virtual bool is_periodic_capable() const = 0;
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virtual void set_periodic() = 0;
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virtual void set_non_periodic() = 0;
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virtual size_t ticks_per_second() const = 0;
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virtual void reset_to_default_ticks_per_second() = 0;
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virtual bool try_to_set_frequency(size_t frequency) = 0;
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virtual bool is_capable_of_frequency(size_t frequency) const = 0;
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virtual size_t calculate_nearest_possible_frequency(size_t frequency) const = 0;
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};
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template<>
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class HardwareTimer<IRQHandler>
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: public HardwareTimerBase
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, public IRQHandler {
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public:
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virtual const char* purpose() const override
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{
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if (TimeManagement::the().is_system_timer(*this))
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return "System Timer";
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return model();
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}
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virtual Function<void(const RegisterState&)> set_callback(Function<void(const RegisterState&)> callback) override
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{
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disable_irq();
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auto previous_callback = move(m_callback);
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m_callback = move(callback);
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enable_irq();
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return previous_callback;
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}
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protected:
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HardwareTimer(u8 irq_number, Function<void(const RegisterState&)> = nullptr);
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//^IRQHandler
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virtual void handle_irq(const RegisterState&) override;
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HardwareTimer(u8 irq_number, Function<void(const RegisterState&)> callback = nullptr)
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: IRQHandler(irq_number)
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, m_callback(move(callback))
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{
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}
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virtual void handle_irq(const RegisterState& regs) override
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{
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if (m_callback)
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m_callback(regs);
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}
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u64 m_frequency { OPTIMAL_TICKS_PER_SECOND_RATE };
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private:
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Function<void(const RegisterState&)> m_callback;
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};
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template<>
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class HardwareTimer<GenericInterruptHandler>
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: public HardwareTimerBase
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, public GenericInterruptHandler {
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public:
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virtual const char* purpose() const override
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{
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return model();
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}
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virtual Function<void(const RegisterState&)> set_callback(Function<void(const RegisterState&)> callback) override
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{
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auto previous_callback = move(m_callback);
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m_callback = move(callback);
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return previous_callback;
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}
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virtual size_t sharing_devices_count() const override { return 0; }
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virtual bool is_shared_handler() const override { return false; }
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virtual bool is_sharing_with_others() const { return false; }
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virtual HandlerType type() const override { return HandlerType::IRQHandler; }
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virtual const char* controller() const override { return nullptr; }
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virtual bool eoi() override;
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protected:
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HardwareTimer(u8 irq_number, Function<void(const RegisterState&)> callback = nullptr)
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: GenericInterruptHandler(irq_number)
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, m_callback(move(callback))
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{
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}
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virtual void handle_interrupt(const RegisterState& regs) override
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{
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if (m_callback)
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m_callback(regs);
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}
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u64 m_frequency { OPTIMAL_TICKS_PER_SECOND_RATE };
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private:
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