armv8: Handle EL2 Host mode
On implementations that support VHE, the layout of the CPTR_EL2 register depends on whether HCR_EL2.E2H is set. If the bit is set, CPTR_EL2 uses the same layout as CPACR_EL1 and can in fact be accessed through that register. In that case, jump to the EL1 code to enable access to the FP/SIMD registers. This allows U-Boot to run on systems that pass control to U-Boot in EL2 with EL2 Host mode enabled such as machines using Apple's M1 SoC. Signed-off-by: NMark Kettenis <kettenis@openbsd.org> Acked-by: NMarc Zyngier <maz@kernel.org>
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