On Sat, Jun 19, 2021 at 01:08:51PM +1000, Nicholas Piggin wrote: > Excerpts from Paul Mackerras's message of June 18, 2021 1:47 pm: > > Microwatt's hardware RNG is accessed using the DARN instruction. > > I think we're getting a platforms/book3s soon with the VAS patches, > might be a place to add the get_random_darn function. > > Huh, DARN is unprivileged right?
It is, that's the whole point: to make it very very cheap for user software it has to be an unprivileged instruction. Segher
