OpenBSD: Implement map_legacy and legacy_io

Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
Reviewed-by: Matthieu Herrb <matthieu.herrb@laas.fr>
Reviewed-by: Jeremy Huddleston <jeremyhu@apple.com>
Tested-by: Matthieu Herrb <matthieu.herrb@laas.fr>
2 files changed