I was just thinking about this: Does the BIOS execute on the CPU? If so, how does it handle multiple CPU architectures/instruction sets? If not, what does it execute on?
closed as unclear what you're asking by Wandering Logic, D.W.♦, Rick Decker, Shaull, Luke Mathieson Aug 18 '14 at 5:46
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Yes, the processor itself runs the BIOS boot program. Each motherboard has to be equipped with appropriate BIOS that a processor of compatible chip set can use.
The bios is just software stored on a chip. It has a special memory address, and the CPU is hardwired to execute the program in that address when it turns on.