Memory types

All addresses in a system, that are not marked as faulting, are assigned a memory type. There are two memory types in Armv8-A; Normal and Device. The memory type is a high-level description of how the processor should interact with the address region. 

Note: In Armv6 and Armv7 there was a third memory type, Strongly Ordered. In Armv8, this maps to Device_nGnRnE. 

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