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