rockchip: back-to-bootrom: add 'back-to-bootrom' support for AArch64
The back-to-bootrom support for Rockchip is equivalent to an (assembly) implementation of setjmp/longjmp (i.e. it saves the stack-pointer, link-register and callee-saved registers). Up until now, this had only been implemented for AArch32 (i.e. ARMv7 or older), which puts the new ARMv8 devices (which boot in AArch64 mode) at a slight disadvantage. To allow use of the 'back-to-bootrom' feature on new devices (e.g. the RK3368), this commit adds an implementation for AArch64. Signed-off-by: NPhilipp Tomsich <philipp.tomsich@theobroma-systems.com> Reviewed-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NTom Rini <trini@konsulko.com>
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