RockOS/kernel/drivers/pic/pic_stubs.S

#include "drivers/pic/pic.h"

.code32
.extern io_wait

.global init_pic
init_pic:
    # init command
    mov $0x11, %al
    outb %al, $PIC1_COMMAND
    outb %al, $PIC2_COMMAND

    # vector offsets
    mov $0x20, %al
    outb %al, $PIC1_DATA
    mov $0x28, %al
    outb %al, $PIC2_DATA

    # cascade 
    mov $0x04, %al
    outb %al, $PIC1_DATA
    mov $0x02, %al  
    outb %al, $PIC2_DATA 

    # env
    mov $0x01, %al
    outb %al, $PIC1_DATA
    outb %al, $PIC2_DATA 

    # mask
    mov $0xF8, %al
    outb %al, $PIC1_DATA
    mov $0x3F, %al
    outb %al, $PIC2_DATA 

    ret

.global send_eoi_master
send_eoi_master:
    mov $0x20, %al
    outb %al, $PIC1_COMMAND
    ret 

.global send_eoi_slave 
send_eoi_slave:
    mov $0x20, %al
    outb %al, $PIC2_COMMAND
    call send_eoi_master
    ret 

.global read_isr_master
read_isr_master:
    xorl %eax, %eax
    mov $0x0B, %al
    outb %al, $PIC1_COMMAND
    in $PIC1_COMMAND, %al
    ret

.global read_isr_slave 
read_isr_slave:
    xorl %eax, %eax
    mov $0x0B, %al
    outb %al, $PIC2_COMMAND
    in $PIC2_COMMAND, %al
    ret