1 /*
2 * Copyright (c) 2000, 2002 Silicon Graphics, Inc. All Rights Reserved.
3 *
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.
7 *
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.
11 *
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.
18 *
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.
22 *
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
25 *
26 * http://www.sgi.com
27 *
28 * For further information regarding this notice, see:
29 *
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
31 */
32 #ifndef __XFS_BIT_H__
33 #define __XFS_BIT_H__
34
35 /*
36 * XFS bit manipulation routines.
37 */
38
39 /*
40 * masks with n high/low bits set, 32-bit values & 64-bit values
41 */
42 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_MASK32HI)
43 __uint32_t xfs_mask32hi(int n);
44 #define XFS_MASK32HI(n) xfs_mask32hi(n)
45 #else
46 #define XFS_MASK32HI(n) ((__uint32_t)-1 << (32 - (n)))
47 #endif
48 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_MASK64HI)
49 __uint64_t xfs_mask64hi(int n);
50 #define XFS_MASK64HI(n) xfs_mask64hi(n)
51 #else
52 #define XFS_MASK64HI(n) ((__uint64_t)-1 << (64 - (n)))
53 #endif
54 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_MASK32LO)
55 __uint32_t xfs_mask32lo(int n);
56 #define XFS_MASK32LO(n) xfs_mask32lo(n)
57 #else
58 #define XFS_MASK32LO(n) (((__uint32_t)1 << (n)) - 1)
59 #endif
60 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_MASK64LO)
61 __uint64_t xfs_mask64lo(int n);
62 #define XFS_MASK64LO(n) xfs_mask64lo(n)
63 #else
64 #define XFS_MASK64LO(n) (((__uint64_t)1 << (n)) - 1)
65 #endif
66
67 /* Get high bit set out of 32-bit argument, -1 if none set */
68 extern int xfs_highbit32(__uint32_t v);
69
70 /* Get low bit set out of 64-bit argument, -1 if none set */
71 extern int xfs_lowbit64(__uint64_t v);
72
73 /* Get high bit set out of 64-bit argument, -1 if none set */
74 extern int xfs_highbit64(__uint64_t);
75
76 /* Count set bits in map starting with start_bit */
77 extern int xfs_count_bits(uint *map, uint size, uint start_bit);
78
79 /* Count continuous one bits in map starting with start_bit */
80 extern int xfs_contig_bits(uint *map, uint size, uint start_bit);
81
82 /* Find next set bit in map */
83 extern int xfs_next_bit(uint *map, uint size, uint start_bit);
84
85 #endif /* __XFS_BIT_H__ */
86
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