x86-bare-metal-examples/interrupt_keyboard.S

/* https://github.com/cirosantilli/x86-bare-metal-examples#ps2-keyboard */

#include "common.h"
BEGIN
    CLEAR
    /* I've read that the keyboard handler is the number 1 (second one),
     * and each entry is 4 byte wide.
     */
    movw $handler, 0x04
    movw $0x00, 0x06
    sti
loop:
    jmp loop
handler:
    PUTC $'a
    iret
jmp loop