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Adding AArch64 CurrentEL register

Robert Roland requested to merge robdaemon/fpc-source:currentel into main

CurrentEL is used to determine the current "exception level" in the CPU.

It has four possible results:

0b00 - EL0 - Application

0b01 - EL1 - Rich OS

0b10 - EL2 - Hypervisor

0b11 - EL3 - Firmware

https://developer.arm.com/documentation/ddi0595/2020-12/AArch64-Registers/CurrentEL--Current-Exception-Level https://developer.arm.com/documentation/102412/0100/Privilege-and-Exception-levels

Edited by Robert Roland

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