SMP on MacBook Pro, some new info

Hi,

I have discovered that it's possible with a very good repeatability (90% or more) to start the second core by pressing power button promptly during the 5 second period when BSP have sent startup IPIs already and is waiting for the AP going online. I am not sure how to interpret this info - perhaps there is some problem with caching BSPs LAPIC writes, and interrupt generated by the power button causes the cache to be flushed.

Any ideas?

-Maxim
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