tree 5a776fd8812046f5bd06ecc8163551d0dab070f4
parent 8bf50cd308a957ecacd6e54b73135b45590b3277
author Heinrich Schuchardt <heinrich.schuchardt@canonical.com> 1698756952 +0200
committer Leo Yu-Chi Liang <ycliang@andestech.com> 1698913326 +0800

rng: Provide a RNG based on the RISC-V Zkr ISA extension

The Zkr ISA extension (ratified Nov 2021) introduced the seed CSR. It
provides an interface to a physical entropy source.

A RNG driver based on the seed CSR is provided. It depends on
mseccfg.sseed being set in the SBI firmware.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>