timer.c File Reference

#include <kernel/cpu/cpu.h>
#include <kernel/cpu/interrupt.h>
#include <kernel/cpu/smp.h>
#include <kernel/cpu/syscalls.h>
#include <kernel/drivers/apic.h>
#include <kernel/drivers/hpet.h>
#include <kernel/drivers/rtc.h>
#include <kernel/log/log.h>
#include <kernel/sched/timer.h>
#include <kernel/log/panic.h>
#include <kernel/sched/thread.h>
#include <stdatomic.h>
#include <stdbool.h>
#include <stdint.h>
#include <sys/math.h>

Go to the source code of this file.

Functions
static void	timer_acquire (void)
static void	timer_release (void)
static void	timer_accumulate (void)
void	timer_ctx_init (timer_ctx_t *ctx)
	Initialize per-CPU timer context.
static void	timer_init (void)
clock_t	timer_uptime (void)
	Time since boot.
time_t	timer_unix_epoch (void)
	The unix epoch.
void	timer_interrupt_handler (interrupt_frame_t *frame, cpu_t *self)
	Handle timer interrupt.
void	timer_subscribe (timer_ctx_t *ctx, timer_callback_t callback)
	Subscribe to timer interrupts.
void	timer_unsubscribe (timer_ctx_t *ctx, timer_callback_t callback)
	Unsubscribe from timer interrupts.
void	timer_one_shot (cpu_t *self, clock_t uptime, clock_t timeout)
	Schedule a one-shot timer interrupt.
	SYSCALL_DEFINE (SYS_UPTIME, clock_t)
	SYSCALL_DEFINE (SYS_UNIX_EPOCH, time_t, time_t *timePtr)
void	timer_notify (cpu_t *cpu)
	Trigger timer interrupt on cpu.
void	timer_notify_self (void)
	Trigger timer interrupt on self.

Variables
static time_t	bootEpoch
static bool	initialized = false
static atomic_int8_t	accumulatorLock = ATOMIC_VAR_INIT(0)
static clock_t	accumulator = 0

Function Documentation

SYSCALL_DEFINE() [1/2]

SYSCALL_DEFINE	(	SYS_UNIX_EPOCH	,
		time_t	,
		time_t *	timePtr
	)

Definition at line 183 of file timer.c.

References ERR, NULL, sched_thread(), thread_copy_to_user(), and timer_unix_epoch().

SYSCALL_DEFINE() [2/2]

SYSCALL_DEFINE	(	SYS_UPTIME	,
		clock_t
	)

Definition at line 178 of file timer.c.

References timer_uptime().

timer_accumulate()

static void timer_accumulate ( void  )

static

Definition at line 41 of file timer.c.

References accumulator, hpet_nanoseconds_per_tick(), hpet_read_counter(), hpet_reset_counter(), timer_acquire(), and timer_release().

Referenced by timer_interrupt_handler().

timer_acquire()

static void timer_acquire ( void  )

static

Definition at line 25 of file timer.c.

References accumulatorLock, atomic_compare_exchange_strong, and interrupt_disable().

Referenced by timer_accumulate(), and timer_uptime().

timer_init()

static void timer_init ( void  )

static

Definition at line 64 of file timer.c.

References bootEpoch, initialized, mktime(), rtc_read(), and time().

Referenced by timer_unix_epoch(), and timer_uptime().

timer_release()

static void timer_release ( void  )

static

Definition at line 35 of file timer.c.

References accumulatorLock, atomic_store, and interrupt_enable().

Referenced by timer_accumulate(), and timer_uptime().

Variable Documentation

accumulator

clock_t accumulator = 0

static

Definition at line 23 of file timer.c.

Referenced by timer_accumulate(), and timer_uptime().

accumulatorLock

atomic_int8_t accumulatorLock = ATOMIC_VAR_INIT(0)

static

Definition at line 22 of file timer.c.

Referenced by timer_acquire(), and timer_release().

bootEpoch

time_t bootEpoch

static

Definition at line 19 of file timer.c.

Referenced by timer_init(), and timer_unix_epoch().

initialized

bool initialized = false

static

Definition at line 20 of file timer.c.

Referenced by timer_init(), timer_unix_epoch(), and timer_uptime().