It's taken from OpenBSD and thus appropriately licensed (and reasonably tested). Change-Id: I5767600c9865d39e56c220b52e045f3501875b98 Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com> Reviewed-on: http://review.coreboot.org/88 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>