Starting APs earlier during boot

[Poul-Henning Kamp]

--------
In message <20160217094241.GF91220 at kib.kiev.ua>, Konstantin Belousov writes:

>E.g. there might be no interrupts set up yet, and idle thread on UP
>gets on CPU, then the whole boot process could deadlock.

idle_thread:

	while (!interrupts_setup_done())
		yield();

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