Module timer

The timer support.

Modules

apic 🔒

hpet 🔒

pit 🔒

The Programmable Interval Timer (PIT) chip (Intel 8253/8254) basically consists of an oscillator, a prescaler and 3 independent frequency dividers. Each frequency divider has an output, which is used to allow the timer to control external circuitry (for example, IRQ 0).

Constants

TIMER_FREQ

The timer frequency (Hz).

Statics

TIMER_IRQ 🔒

Functions

init_ap 🔒

Enables timer interrupt on this AP.

init_bsp 🔒

Initializes the timer state and enable timer interrupts on BSP.

timer_callback 🔒