BUS_WRITE_IVAR(9) on FreeBSD

The text 394c9094e034, as FreeBSD 4.2-RELEASE, FreeBSD 4.1.1-RELEASE, FreeBSD 4.1-RELEASE, FreeBSD 4.0-RELEASE shipped it.

manipulate bus-specific device instance variables

BUS_WRITE_IVAR(9) on FreeBSD now