1/*
2 * Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
17 */
18#ifndef __XFS_BIT_H__
19#define	__XFS_BIT_H__
20
21/*
22 * XFS bit manipulation routines.
23 */
24
25/*
26 * masks with n high/low bits set, 32-bit values & 64-bit values
27 */
28#define	XFS_MASK32HI(n)		xfs_mask32hi(n)
29static inline __uint32_t xfs_mask32hi(int n)
30{
31	return (__uint32_t)-1 << (32 - (n));
32}
33#define	XFS_MASK64HI(n)		xfs_mask64hi(n)
34static inline __uint64_t xfs_mask64hi(int n)
35{
36	return (__uint64_t)-1 << (64 - (n));
37}
38#define	XFS_MASK32LO(n)		xfs_mask32lo(n)
39static inline __uint32_t xfs_mask32lo(int n)
40{
41	return ((__uint32_t)1 << (n)) - 1;
42}
43#define	XFS_MASK64LO(n)		xfs_mask64lo(n)
44static inline __uint64_t xfs_mask64lo(int n)
45{
46	return ((__uint64_t)1 << (n)) - 1;
47}
48
49/* Get high bit set out of 32-bit argument, -1 if none set */
50extern int xfs_highbit32(__uint32_t v);
51
52/* Get low bit set out of 64-bit argument, -1 if none set */
53extern int xfs_lowbit64(__uint64_t v);
54
55/* Get high bit set out of 64-bit argument, -1 if none set */
56extern int xfs_highbit64(__uint64_t);
57
58/* Count set bits in map starting with start_bit */
59extern int xfs_count_bits(uint *map, uint size, uint start_bit);
60
61/* Count continuous one bits in map starting with start_bit */
62extern int xfs_contig_bits(uint *map, uint size, uint start_bit);
63
64/* Find next set bit in map */
65extern int xfs_next_bit(uint *map, uint size, uint start_bit);
66
67#endif	/* __XFS_BIT_H__ */
68