svn commit: r274739 - head/sys/mips/conf

[Mark R V Murray]

> On 24 Nov 2014, at 23:22, Warner Losh <imp at bsdimp.com> wrote:
> 
> What’s the minimum specs required for get_cyclecount()? Not all of the
> boxes that Ian was posting about have high-resolution time-keeping counters
> in hardware… Maybe there’s some underlying expectation for this function
> that these systems either aren’t providing or can’t provide.

get_cyclecount should be a high-resolution timing counter linear in time, with a minimum tick no more accurate than a single instruction execution. In practice we take what we can get. It is used to measure hopefully chaotic events in order to obtain environmental entropy.

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Mark R V Murray