We don't want the compiler to remove these asm statements or
reorder them in any way. Mark them as volatile to be sure.
Signed-off-by: NStephen Boyd <sboyd@codeaurora.org>
Acked-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NDavid Brown <davidb@codeaurora.org>