Re: multi-domain PCI and sysfs

David S. Miller
2004-09-08T18:26:47Z

On Wed, 8 Sep 2004 02:55:15 -0400
Jon Smirl <jonsmirl@gmail.com> wrote:

> Another part I don't understand... PCI VGA hardware is designed to
> respond to IN/OUT instructions to port space. ppc64/ia64 don't have
> IN/OUT port instructions.

On ppc, sparc, and other non-x86 platforms, when you perform load/store
instructions within the port I/O space window, the PCI controller emits
the IN/OUT transactions exactly as if an x86 processor had executed
an in{bwl}/out{bwl} instruction.