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Kernel: Implement TimeManagement for aarch64

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This sets up the RPi::Timer to trigger an interurpt every 4ms using one
of the comparators. The actual time is calculated by looking at the main
counter of the RPi::Timer using the Timer::update_time function.

A stub for Scheduler::timer_tick is also added, since the TimeManagement
code now calls the function.
This commit is contained in:
Timon Kruiper 2022-10-17 15:17:25 +02:00 • committed by Gunnar Beutner
parent 83b95c135e
commit 01a14ac7af
4 changed files with 85 additions and 4 deletions
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10
Kernel/Time/TimeManagement.h
View file

@ -13,6 +13,7 @@
#include <AK/Types.h>
#include <Kernel/API/TimePage.h>
#include <Kernel/Arch/RegisterState.h>
#include <Kernel/Forward.h>
#include <Kernel/Library/LockRefPtr.h>
#include <Kernel/Library/NonnullLockRefPtrVector.h>
#include <Kernel/UnixTypes.h>
@ -54,9 +55,7 @@ public:
bool is_system_timer(HardwareTimerBase const&) const;
static void update_time(RegisterState const&);
static void update_time_hpet(RegisterState const&);
void increment_time_since_boot_hpet();
void increment_time_since_boot();
static bool is_hpet_periodic_mode_allowed();
@ -85,6 +84,12 @@ private:
#if ARCH(I386) || ARCH(X86_64)
bool probe_and_set_x86_legacy_hardware_timers();
bool probe_and_set_x86_non_legacy_hardware_timers();
void increment_time_since_boot_hpet();
static void update_time(RegisterState const&);
#elif ARCH(AARCH64)
bool probe_and_set_aarch64_hardware_timers();
#else
# error Unknown architecture
#endif
Vector<HardwareTimerBase*> scan_and_initialize_periodic_timers();
Vector<HardwareTimerBase*> scan_for_non_periodic_timers();
@ -95,6 +100,7 @@ private:
static u64 scheduling_current_time(bool);
// Variables between m_update1 and m_update2 are synchronized
// FIXME: Replace m_update1 and m_update2 with a SpinlockLocker
Atomic<u32> m_update1 { 0 };
u32 m_ticks_this_second { 0 };
u64 m_seconds_since_boot { 0 };