section .text

; void outb(os_u16 port, os_u8 data);
global outb
outb:
	MOV EDX, [ESP + 4]	; load parameter 'port'
	MOV EAX, [ESP + 8]	; load parameter 'data'
	OUT DX, AL			; output byte in AL to port in DX
	RET					; return

; void outw(os_u16 port, os_u16 data)
global outw
outw:
	MOV EDX, [ESP + 4]	; load parameter 'port'
	MOV EAX, [ESP + 8]	; load parameter 'data'
	OUT DX, AX			; output word in AX to port in DX
	RET					; return

; void outd(os_u16 port, os_u32 data)
global outd
outd:
	MOV EDX, [ESP + 4]	; load parameter 'port'
	MOV EAX, [ESP + 8]	; load parameter 'data'
	OUT DX, EAX			; output double word in EAX to port in DX
	RET					; return

; os_u8 inb(os_u16 port)
global inb
inb:
	MOV	EDX, [ESP + 4]	; load parameter 'port'
	XOR EAX, EAX		; reset EAX
	IN	AL, DX			; read byte from port 'DX'
	RET					; return

; os_u16 inw(os_u16 port)
global inw
inw:
	MOV EDX, [ESP + 4]	; load parameter 'port'
	XOR EAX, EAX		; reset EAX
	IN AX, DX			; read word from port 'DX'
	RET					; return

; os_u32 ind(os_u16 port)
global ind
ind:
	MOV EDX, [ESP + 4]	; load parameter 'port'
	XOR EAX, EAX		; reset EAX
	IN EAX, DX			; read double word from port 'DX'
	RET					; return