Excerpts from Segher Boessenkool's message of June 20, 2021 12:36 am: > 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.
Right, I was just doing a double-take. In that case we should enable it in the pseries random number code as well, so it really would be a generic isa 3.0 function that all (microwatt, powernv, pseries) could use AFAIKS. Thanks, Nick
