Function bitrange

freebsd/kern/subr_blist.c:179–185

* Provide a mask with count bits set, starting as position n. */

 * Provide a mask with count bits set, starting as position n.
 */
static inline u_daddr_t
bitrange(int n, int count)
{

	return (((u_daddr_t)-1 << n) &
	    ((u_daddr_t)-1 >> (BLIST_RADIX - (n + count))));
}

/*
 * Find the first bit set in a u_daddr_t.