forked from Mirrors/opensbi

The machine-level MSIP bits are written by accesses to memory-mapped control registers. Only use CSR instruction for SSIP and USIP. There is no effect that using CSR instruction to write MSIP when testing on unleashed board and QEMU. Signed-off-by: Zong Li <zong.li@sifive.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>