sun4v_rng_ctl_read_v2
hv_err = sun4v_rng_ctl_read_v2(ra, unit, &state,
hv_err = sun4v_rng_ctl_read_v2(0UL, ~0UL, &x, &x, &x, &x);
extern unsigned long sun4v_rng_ctl_read_v2(unsigned long ctl_regs_ra,