2 * Copyright (c) 2000, 2002 Silicon Graphics, Inc. All Rights Reserved.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc., 59
21 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
28 * For further information regarding this notice, see:
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
36 * XFS bit manipulation routines.
40 * masks with n high/low bits set, 32-bit values & 64-bit values
42 #define XFS_MASK32HI(n) xfs_mask32hi(n)
43 static inline __uint32_t xfs_mask32hi(int n)
45 return (__uint32_t)-1 << (32 - (n));
47 #define XFS_MASK64HI(n) xfs_mask64hi(n)
48 static inline __uint64_t xfs_mask64hi(int n)
50 return (__uint64_t)-1 << (64 - (n));
52 #define XFS_MASK32LO(n) xfs_mask32lo(n)
53 static inline __uint32_t xfs_mask32lo(int n)
55 return ((__uint32_t)1 << (n)) - 1;
57 #define XFS_MASK64LO(n) xfs_mask64lo(n)
58 static inline __uint64_t xfs_mask64lo(int n)
60 return ((__uint64_t)1 << (n)) - 1;
63 /* Get high bit set out of 32-bit argument, -1 if none set */
64 extern int xfs_highbit32(__uint32_t v);
66 /* Get low bit set out of 64-bit argument, -1 if none set */
67 extern int xfs_lowbit64(__uint64_t v);
69 /* Get high bit set out of 64-bit argument, -1 if none set */
70 extern int xfs_highbit64(__uint64_t);
72 /* Count set bits in map starting with start_bit */
73 extern int xfs_count_bits(uint *map, uint size, uint start_bit);
75 /* Count continuous one bits in map starting with start_bit */
76 extern int xfs_contig_bits(uint *map, uint size, uint start_bit);
78 /* Find next set bit in map */
79 extern int xfs_next_bit(uint *map, uint size, uint start_bit);
81 #endif /* __XFS_BIT_H__ */