forked from Mirrors/opensbi

The SBI SSE extension defines a set of function that can be called to register and handle supervisor sofwtare events. This patch implements all of the functionality defined in the specification. Signed-off-by: Clément Léger <cleger@rivosinc.com> Reviewed-by: Himanshu Chauhan <hchauhan@ventanamicro.com> Reviewed-by: Anup Patel <anup@brainfault.org>