projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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 | */ | |
| 1da177e4 | 42 | #define XFS_MASK32HI(n) xfs_mask32hi(n) |
| a844f451 NS |
43 | static inline __uint32_t xfs_mask32hi(int n) |
| 44 | { | |
| 45 | return (__uint32_t)-1 << (32 - (n)); | |
| 46 | } | |
| 1da177e4 | 47 | #define XFS_MASK64HI(n) xfs_mask64hi(n) |
| a844f451 NS |
48 | static inline __uint64_t xfs_mask64hi(int n) |
| 49 | { | |
| 50 | return (__uint64_t)-1 << (64 - (n)); | |
| 51 | } | |
| 1da177e4 | 52 | #define XFS_MASK32LO(n) xfs_mask32lo(n) |
| a844f451 NS |
53 | static inline __uint32_t xfs_mask32lo(int n) |
| 54 | { | |
| 55 | return ((__uint32_t)1 << (n)) - 1; | |
| 56 | } | |
| 1da177e4 | 57 | #define XFS_MASK64LO(n) xfs_mask64lo(n) |
| a844f451 NS |
58 | static inline __uint64_t xfs_mask64lo(int n) |
| 59 | { | |
| 60 | return ((__uint64_t)1 << (n)) - 1; | |
| 61 | } | |
| 1da177e4 LT |
62 | |
| 63 | /* Get high bit set out of 32-bit argument, -1 if none set */ | |
| 64 | extern int xfs_highbit32(__uint32_t v); | |
| 65 | ||
| 66 | /* Get low bit set out of 64-bit argument, -1 if none set */ | |
| 67 | extern int xfs_lowbit64(__uint64_t v); | |
| 68 | ||
| 69 | /* Get high bit set out of 64-bit argument, -1 if none set */ | |
| 70 | extern int xfs_highbit64(__uint64_t); | |
| 71 | ||
| 72 | /* Count set bits in map starting with start_bit */ | |
| 73 | extern int xfs_count_bits(uint *map, uint size, uint start_bit); | |
| 74 | ||
| 75 | /* Count continuous one bits in map starting with start_bit */ | |
| 76 | extern int xfs_contig_bits(uint *map, uint size, uint start_bit); | |
| 77 | ||
| 78 | /* Find next set bit in map */ | |
| 79 | extern int xfs_next_bit(uint *map, uint size, uint start_bit); | |
| 80 | ||
| 81 | #endif /* __XFS_BIT_H__ */ |