Add {get,set}_field macros (simliar to ehci) to read and update some bits of a word. Put them into use for updating pls (port link state) values. Also add a enum for pls values. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Read the documentation in qemu-doc.html or on http://wiki.qemu.org - QEMU team