On 17 Mar 1999, ellis wrote:
> In article <>,
> Dave <[EMAIL PROTECTED]> wrote:
>
> >How does one directly access an I/O address from C?
>
> >From linux user space?
>
> >For example if I want to write a char to port 0x80 (or read a char from a
> >port) what is the statement?
>
> outb(c,0x80); Writes the value in c to port 0x80. You have to have
> called iopl (see man iopl) as root to set permissions first. Definitions
> for the io calls are in #include <asm/io.h>. Typing "man outb" should
> get you more information.
Note that you have to compile with -O2 or inb/outb/etc. will fail to work.
--
"Love the dolphins," she advised him. "Write by W.A.S.T.E.."
