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