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TFMR is the Time Facility Management Register which is specific to POWER CPUs, and used for the purpose of timebase management (generally by firmware, not the OS). Add helpers for the TFMR register, which will form part of the core timebase facility model in future but for now behaviour is unchanged. Reviewed-by: Cédric Le Goater <clg@kaod.org> Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Message-ID: <20230625120317.13877-3-npiggin@gmail.com> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>