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TCR2_EL1 introduced some additional controls besides TCR_EL1. Currently only PIE is supported and enabled by writing TCR2_EL1 directly if PIE detected. Introduce a named register 'tcr2' just like 'tcr' we've already had. It'll be initialized to 0 and updated if certain feature detected and needs to be enabled. Touch the TCR2_EL1 registers at last with the updated 'tcr2' value if FEAT_TCR2 supported by checking ID_AA64MMFR3_EL1.TCRX. Then we can extend the support of other features controlled by TCR2_EL1. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Yicong Yang <yangyicong@hisilicon.com> Link: https://lore.kernel.org/r/20241102104235.62560-3-yangyicong@huawei.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>