Carlos
7797630a24
Lesson 20 step 1, the timer
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%!s(int64=10) %!d(string=hai) anos | |
|---|---|---|
| .. | ||
| cpu | %!s(int64=10) %!d(string=hai) anos | |
| drivers | %!s(int64=10) %!d(string=hai) anos | |
| kernel | %!s(int64=10) %!d(string=hai) anos | |
| Makefile | %!s(int64=10) %!d(string=hai) anos | |
| README.md | %!s(int64=10) %!d(string=hai) anos | |
| boot | %!s(int64=10) %!d(string=hai) anos | |
README.md
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!