userland driver?

[Andriy Gapon]

has anybody tried anything in the area of userland drivers on FreeBSD?
I mean a driver for something sufficiently simple and standalone and not
driven by interrupts. E.g. some sort of a watchdog driver that simply
reads/writes some io registers from time to time.

Brute-force and a very bad way is to go through /dev/mem, /dev/io,
/dev/pci, but I am thinking about something that would allow to plug
into newbus framework from userland.

-- 
Andriy Gapon