At the moment grab and ungrab methods of all console drivers are no-ops.
Current intended meaning of the calls is that the kernel takes control of
console input. In the future the semantics may be extended to mean that
the calling thread takes full ownership of the console (e.g. console
output from other threads could be suspended).
Inspired by: bde
MFC after: 2 months
level. The distinction was artificial. Some more movement around the
deck charis is likely depending on the fallout from this one.
Paths were corrected after the svn mv. Hope that's OK.