Pyro Internal Functions: Timers

Functions
bigtime_t	get_system_time (void)
	Returns the time elapsed since last system boot. More...
bigtime_t	get_real_time (void)
	Returns the number of microseconds since 1970-01-01. More...
bigtime_t	get_idle_time (int nProcessor)
	Returns the total idle time for the given CPU. More...
void	TimerInterrupt (SysCallRegs_s *psRegs)
	This is the timer interrupt handler, called INT_FREQ times per second. More...
void	start_timer_int (void)
	Initializes the PIT timers. More...
void	get_cmos_time (void)
	Sets the system time from the battery-backed CMOS clock. More...

Detailed Description

Function Documentation

void get_cmos_time

(

void

)

Sets the system time from the battery-backed CMOS clock.

See Also

kernel_init()

Author

Kurt Skauen (kurt@.nosp@m.athe.nosp@m.os.cx)

bigtime_t get_idle_time

(

int

nProcessor

)

Returns the total idle time for the given CPU.

Parameters

nProcessor

the processor for which to return the idle time.

Returns

Idle time for the given CPU, in microseconds.

Author

Kurt Skauen (kurt@.nosp@m.athe.nosp@m.os.cx)

bigtime_t get_real_time

(

void

)

Returns the number of microseconds since 1970-01-01.

Returns

The number of microseconds since 1970-01-01.

Author

Kurt Skauen (kurt@.nosp@m.athe.nosp@m.os.cx)

bigtime_t get_system_time

(

void

)

Returns the time elapsed since last system boot.

Returns

Time since last system boot, in microseconds.

Author

Kurt Skauen (kurt@.nosp@m.athe.nosp@m.os.cx)

void start_timer_int

(

void

)

Initializes the PIT timers.

See Also

kernel_init()

Author

Kurt Skauen (kurt@.nosp@m.athe.nosp@m.os.cx)

void TimerInterrupt

(

SysCallRegs_s *

psRegs

)

This is the timer interrupt handler, called INT_FREQ times per second.

It updates the system time and calls functions send_timer_signals() and wake_up_sleepers(). If there is no APIC present, Schedule() is also called here; otherwise, Schedule() is called for each CPU via do_smp_preempt(), which is triggered by the APIC timer.

Parameters

dummy

unused.

See Also

idle_loop()

Author

Kurt Skauen (kurt@.nosp@m.athe.nosp@m.os.cx)