Re: Collecting entropy from device_attach() times.

RW <[e-mail]> writes:
> static __inline uint64_t
> get_cyclecount(void)
> {
>         struct bintime bt;
>
>         binuptime(&bt);
>         return (bt.frac ^ bt.sec);
>=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
> }

Why the heck does it xor the integer and fractional parts together?
That makes no sense at all.  I would have used ((uint64_t)bt.sec << 32 |
bt.frac >> 32).  It wraps around after 136 years' uptime, but hey, you
can't win them all.

DES
--=20
Dag-Erling Sm=C3=B8rgrav - [e-mail]
_______________________________________________
[e-mail] mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-security
To unsubscribe, send any mail to "[e-mail]"