8fd35a03b5
is partly based on the Alpha system which duplicates the clock to each cpu, instead of doing a clock roundrobin like on i386. This means we get hz * ncpu clocks per second and so we have to seperate clock sampling from actual 'do the work' clock processing. The BSP runs the complete processing, the rest just sample state etc. Using the on-cpu interval timer is not ideal as it will drift. There is more to be done here, we should use an external clock source.
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