global outb
; out b - send a byte to an I/O port
; stack: [esp + 8] the data byte
;   	 [esp + 4] the I/O port
;	 [esp    ] return address
outb:
	mov al, [esp + 8]
	mov dx, [esp + 4]	; move the address into dx
	out dx, al		; send the data to the I/O port
	ret			; return to the calling function

global inb
; inb - returns a byte from the given I/O port
; stack: [esp + 4] The address of the I/O port
;  	 [esp    ] The return address
inb:
	mov dx, [esp + 4]	; move the address of the I/O port to the dx register
	in al, dx		; read a byte from the I/O port and store it in the al register
	ret			; return the read byte


global io_wait
io_wait:
	mov al, 0x0
	out 0x80, al
	ret