Setting PC for and waking up secondary cores from the primary core

Given a multiprocessor system, how are the PC values of secondary cores set from the primary core? I've read lots of threads stating it can be done but without any details. I could not find anything in the ARMv8 reference manual.

One might contrive a mailbox system where the secondary cores wfe and check the value of a mailbox address when woken up. But is there a supported method to directly write the secondary core PC before waking it up? What are the various methods for "waking up" a core?

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