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Kernel: Set up and calibrate APIC timer, and enable timer on all CPUs

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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.
This commit is contained in:
Tom 2020-10-25 09:13:47 -06:00 • committed by Andreas Kling
parent 9d347352a1
commit fe615e601a
14 changed files with 478 additions and 70 deletions
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15
Kernel/Interrupts/APIC.h
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@ -27,10 +27,13 @@
#pragma once
#include <AK/Types.h>
#include <Kernel/Time/HardwareTimer.h>
#include <Kernel/VM/MemoryManager.h>
namespace Kernel {
class APICTimer;
struct LocalAPIC {
u32 apic_id;
};
@ -52,6 +55,17 @@ public:
Thread* get_idle_thread(u32 cpu) const;
u32 enabled_processor_count() const { return m_processor_enabled_cnt; }
APICTimer* initialize_timers(HardwareTimerBase&);
APICTimer* get_timer() const { return m_apic_timer; }
enum class TimerMode {
OneShot,
Periodic,
TSCDeadline
};
void setup_local_timer(u32, TimerMode, bool);
u32 get_timer_current_count();
u32 get_timer_divisor();
private:
class ICRReg {
u32 m_low { 0 };
@ -102,6 +116,7 @@ private:
AK::Atomic<u8> m_apic_ap_continue { 0 };
u32 m_processor_cnt { 0 };
u32 m_processor_enabled_cnt { 0 };
APICTimer* m_apic_timer { nullptr };
static PhysicalAddress get_base();
static void set_base(const PhysicalAddress& base);