Yes, by default these are blocked. But there are two ways in which you can gain access to I/O ports: 1) Enable access to all I/O ports for all processes with i386_iopl(2) 2) Enable access to individual I/O ports for the current process with i386_set_ioperm(2) Both calls must be called with superuser privileges (and i386_iopl has even more restrictions).
I'm a CS student, I really like all this low-level stuff, and I want to learn how OS'es work. On Thu, 1 May 2008 20:00:38 +0200 Jonathan Schleifer <[EMAIL PROTECTED]> wrote: > Sviatoslav Chagaev <[EMAIL PROTECTED]> wrote: > > > Yes, I even wrote a program which "talks" with the device directly, > > with the help of inb()/outb(). > > I doubt you could use inb/outb in OpenBSD. The kernel will prevent that. > Just talk with the device in /dev directly - there is really no need to > write a driver. OpenBSD already has an LPT driver that gives access to > it to the userland, so why reinvent the wheel here? > > -- > Jonathan
