Steve Passe 812e4da7a8 New simple_lock code in asm:
- s_lock_init()
 - s_lock()
 - s_lock_try()
 - s_unlock()

Created lock for IO APIC and apic_imen  (SMP version of imen)
 - imen_lock

Code to use imen_lock for access from apic_ipl.s and apic_vector.s.
Moved this code *outside* of mp_lock.

It seems to work!!!
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