libutils: riscv: provide atomic_rv.S

Implement atomic_inc32() and atomic_dec32() in atomic_rv.S.
The implementation is based on atomic addition instruction
with acquire and release suffix to add add

libutils: riscv: provide atomic_rv.S

Implement atomic_inc32() and atomic_dec32() in atomic_rv.S.
The implementation is based on atomic addition instruction
with acquire and release suffix to add additional memory
order constraints.

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Acked-by: Etienne Carriere <etienne.carriere@linaro.org>

show more ...