armv8 exception levels

The ARMv8 exception model defines Exception levels EL0-EL3, where:
	EL0 has the lowest software execution privilege, and execution at EL0 is called unprivileged execution.
	Increased values of n, from 1 to 3, indicate increased software execution privilege.
	EL2 provides support for processor virtualization.
	EL3 provides support for two security states, see Security state.
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