rockchip: back-to-bootrom: add 'back-to-bootrom' support for AArch64
authorPhilipp Tomsich <philipp.tomsich@theobroma-systems.com>
Thu, 22 Jun 2017 22:05:38 +0000 (00:05 +0200)
committerPhilipp Tomsich <philipp.tomsich@theobroma-systems.com>
Sun, 13 Aug 2017 15:12:19 +0000 (17:12 +0200)
commit36979c7e56bd43e205b0b3d7163d3c3eab726bce
tree763a72ec345c4004dc70d6683732c39abbab868b
parenta954fa320374fa1a6c924d087344ca59e77475f8
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: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
arch/arm/mach-rockchip/save_boot_param.S