when CPU cores come out of power-gated state, how do they initialize?

[VirtualLarry]

Just curious. Do they jump to the BIOS address to init, or is there some other way to init a freshly powered-up core.

 

[CTho9305]

If you have access to this paper, it might cover some of what you're looking for. It's not a standard thing though... everybody does it slightly differently.

edit: the Family 14h BKDG discloses a lot about CC6 and PC6. Section 2.9.6 might be the short answer to your question, but there's a lot of info if you just search for "C6".

 

[Exophase]

Usually the CPU core is capable of saving whatever state needs to be saved to some internal SRAM and restoring it when it's powered back on.