Hardware write and read function for linux

Question

What would be the equivalent function i could choose in LINUX as compared to below DOS calls ?

inportb(x) 
outportb(x,v)

Thanks Brijesh

Answer 1

If you are doing only port I/O then you can use ioperm to change permissions and then use in*/out* from user space. Obviously user permissions still apply.

Answer 2

You can use inb() and outb() calls. Go here you'll find more information how to use it.