Messages in this thread | | | Date | Fri, 16 Aug 2002 11:28:02 -0500 | From | Oliver Xymoron <> | Subject | Re: Problem with random.c and PPC |
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On Thu, Aug 15, 2002 at 02:04:49PM -0700, Tom Rini wrote: > On Thu, Aug 15, 2002 at 01:59:33PM -0600, Andreas Dilger wrote: > > On Aug 15, 2002 12:03 -0700, Tom Rini wrote: > > > On Thu, Aug 15, 2002 at 12:25:56PM -0600, Andreas Dilger wrote: > > > > Maybe the PPC keyboard/mouse drivers do not add randomness? > > > > > > Well, how is this set for the i386 ones? I grepped around and I didn't > > > really see anything, so I'm sort-of confused. > > > > I think it is something like "add_mouse_entropy" and "add_keyboard_entropy" > > or similar. If you look at the random.c sources you can find the actual > > function names and work backwards from there. > > Ah, thanks. In that case, no. It doesn't look like the input-layer USB > keyboards contribute to entropy (but mice do), and I don't think the ADB > ones do. I'll take a crack at adding this to keyboards monday maybe.
Tom, I'm working on a set of patches that completely change this interface because there are a bunch of problems with the current entropy accounting.
What PPC and other arches really need in this area is a higher resolution timing source. The jiffies-based timing is rather limiting, especially after the entropy accounting stops overestimating things by orders of magnitude. Does the PPC port have a convenient way to access the TBR or something similar?
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