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*Concepts you may want to Google beforehand: CPU timer, keyboard interrupts*
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**Goal: Implement our first IRQ handlers: the CPU timer and the keyboard**
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Everything is now ready to test our hardware interrupts.
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Timer
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-----
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The timer is easy to configure. First we'll declare an `init_timer()` on `cpu/timer.h` and
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implement it on `cpu/timer.c`. It is just a matter of computing the clock frequency and
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sending the bytes to the appropriate ports.
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We will now fix `kernel/utils.c int_to_ascii()` to print the numbers in the correct order.
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For that, we need to implement `reverse()` and `strlen()`.
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Finally, go back to the `kernel/kernel.c` and do two things. Enable interrupts again
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(very important!) and then initialize the timer interrupt.
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Go `make run` and you'll see the clock ticking!
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