How to have permission to access ports?

[nobody]

I write a simple code to read a port with the in instruction but when i run the program the in al, dx create a segmentation fault.

I find that to use in or out instruction in linux i first need permission but i don't know how?

The code:

global _start

section .data

section .text

_start:

mov dx, 03f8h
in al, dx

xor ebx, ebx      ; send 0 as 'exit code'
mov eax, 1      ; terminate process
int 80h         ; execute the syscall

[nobody]

I think you should use a1 (that's a one)  instead of al (that's an L).

[Frank Kotler]

What effect do you get by replacing "al", a register name, with "a1", an undefined symbol??? Won't assemble for me. :(

Try sys_ioperm.

Best,
Frank