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86 lines
2.9 KiB
C
86 lines
2.9 KiB
C
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/*
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* Copyright (c) 2000, 2002 Silicon Graphics, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Further, this software is distributed without any warranty that it is
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* free of the rightful claim of any third person regarding infringement
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* or the like. Any license provided herein, whether implied or
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* otherwise, applies only to this software file. Patent licenses, if
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* any, provided herein do not apply to combinations of this program with
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* other software, or any other product whatsoever.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write the Free Software Foundation, Inc., 59
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* Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
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* Mountain View, CA 94043, or:
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*
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* http://www.sgi.com
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*
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* For further information regarding this notice, see:
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*
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* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
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*/
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#ifndef __XFS_BIT_H__
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#define __XFS_BIT_H__
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/*
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* XFS bit manipulation routines.
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*/
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/*
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* masks with n high/low bits set, 32-bit values & 64-bit values
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*/
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#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_MASK32HI)
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__uint32_t xfs_mask32hi(int n);
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#define XFS_MASK32HI(n) xfs_mask32hi(n)
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#else
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#define XFS_MASK32HI(n) ((__uint32_t)-1 << (32 - (n)))
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#endif
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#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_MASK64HI)
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__uint64_t xfs_mask64hi(int n);
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#define XFS_MASK64HI(n) xfs_mask64hi(n)
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#else
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#define XFS_MASK64HI(n) ((__uint64_t)-1 << (64 - (n)))
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#endif
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#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_MASK32LO)
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__uint32_t xfs_mask32lo(int n);
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#define XFS_MASK32LO(n) xfs_mask32lo(n)
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#else
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#define XFS_MASK32LO(n) (((__uint32_t)1 << (n)) - 1)
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#endif
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#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_MASK64LO)
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__uint64_t xfs_mask64lo(int n);
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#define XFS_MASK64LO(n) xfs_mask64lo(n)
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#else
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#define XFS_MASK64LO(n) (((__uint64_t)1 << (n)) - 1)
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#endif
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/* Get high bit set out of 32-bit argument, -1 if none set */
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extern int xfs_highbit32(__uint32_t v);
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/* Get low bit set out of 64-bit argument, -1 if none set */
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extern int xfs_lowbit64(__uint64_t v);
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/* Get high bit set out of 64-bit argument, -1 if none set */
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extern int xfs_highbit64(__uint64_t);
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/* Count set bits in map starting with start_bit */
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extern int xfs_count_bits(uint *map, uint size, uint start_bit);
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/* Count continuous one bits in map starting with start_bit */
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extern int xfs_contig_bits(uint *map, uint size, uint start_bit);
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/* Find next set bit in map */
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extern int xfs_next_bit(uint *map, uint size, uint start_bit);
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#endif /* __XFS_BIT_H__ */
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