PLV_USER
#define _PAGE_USER (PLV_USER << _PAGE_PLV_SHIFT)
#define user_mode(regs) (((regs)->csr_prmd & PLV_MASK) == PLV_USER)
crmd |= PLV_USER;
prmd |= PLV_USER;
#define _PAGE_USER (PLV_USER << _PAGE_PLV_SHIFT)