hat_chgprot
void hat_chgprot(struct hat *, caddr_t, size_t, uint_t);
hat_chgprot(seg->s_as->a_hat, addr, len, prot);
hat_chgprot(kas.a_hat, addr, size, prot);
hat_chgprot(seg->s_as->a_hat, addr, len, svd->prot);