riscv_cached_marchid
unsigned long riscv_cached_marchid(unsigned int cpu_id);
EXPORT_SYMBOL(riscv_cached_marchid);
cpu_id = riscv_cached_marchid(cpu);
(riscv_cached_marchid(0) & 0xFFFF) == 0x8A66) {
riscv_cached_marchid(0) == 0 &&