os-tutorial/20-interrupts-timer

Concepts you may want to Google beforehand: CPU timer, keyboard interrupts

Goal: Implement our first IRQ handlers: the CPU timer and the keyboard

Everything is now ready to test our hardware interrupts.

Timer

The timer is easy to configure. First we'll declare an init_timer() on cpu/timer.h and implement it on cpu/timer.c. It is just a matter of computing the clock frequency and sending the bytes to the appropriate ports.

We will now fix kernel/utils.c int_to_ascii() to print the numbers in the correct order. For that, we need to implement reverse() and strlen().

Finally, go back to the kernel/kernel.c and do two things. Enable interrupts again (very important!) and then initialize the timer interrupt.

Go make run and you'll see the clock ticking!