On 1 December 2016 at 11:28, Andre Przywara <andre.przyw...@arm.com> wrote: > I don't think so. At least here as a _variable_ type uint32_t is > probably the right one, as the ARMv8 ARM explicitly says that PMCR is a > 32-bit register, for both bitnesses.
For 64-bit ARM this is strictly speaking just shorthand for "64-bit register with the top 32-bit being RES0". It is in theory possible that a future architecture extension might define uses for those RES0 bits. thanks -- PMM