Messages in this thread |  | | | From | "H. Peter Anvin" <> | | Subject | Re: [RFC] RNG rewrite... | | Date | Mon, 17 Oct 2005 16:15:49 -0700 (PDT) |
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Followup to: <20051016005341.GB5946@plexity.net> By author: Deepak Saxena <dsaxena@plexity.net> In newsgroup: linux.dev.kernel > > It's a magic regsiter we just read/write and could be done in userspace. > I also took a look at MPC85xx and it has the same sort of interface but > also has an error interrupt capability. On second thought a class > interface is overkill b/c there will only be one RNG per system, so > I can just do something like watchdogs where we have a bunch of simple > drivers exposing the same interface. We could do it in user space but > then we have separate RNG implementations for x86 and !x86 and I'd > rather not see that. Can we move the x86 code out to userspace and > just let the daemon eat the numbers directly from HW? We can mmap() > PCI devices, but I don't know enough about x86 to say whether msr > instructions can execute out of userspace (or if we want them to...). >
MSR instructions cannot execute out of userspace, but the MSR driver might be possible to use. It's usually quite slow, however.
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