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75 lines
1.5 KiB
75 lines
1.5 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Copyright (c) 2000,2002,2005 Silicon Graphics, Inc. |
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* All Rights Reserved. |
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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, 64-bit values |
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*/ |
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static inline uint64_t xfs_mask64hi(int n) |
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{ |
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return (uint64_t)-1 << (64 - (n)); |
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} |
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static inline uint32_t xfs_mask32lo(int n) |
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{ |
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return ((uint32_t)1 << (n)) - 1; |
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} |
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static inline uint64_t xfs_mask64lo(int n) |
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{ |
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return ((uint64_t)1 << (n)) - 1; |
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} |
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/* Get high bit set out of 32-bit argument, -1 if none set */ |
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static inline int xfs_highbit32(uint32_t v) |
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{ |
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return fls(v) - 1; |
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} |
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/* Get high bit set out of 64-bit argument, -1 if none set */ |
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static inline int xfs_highbit64(uint64_t v) |
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{ |
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return fls64(v) - 1; |
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} |
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/* Get low bit set out of 32-bit argument, -1 if none set */ |
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static inline int xfs_lowbit32(uint32_t v) |
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{ |
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return ffs(v) - 1; |
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} |
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/* Get low bit set out of 64-bit argument, -1 if none set */ |
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static inline int xfs_lowbit64(uint64_t v) |
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{ |
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uint32_t w = (uint32_t)v; |
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int n = 0; |
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if (w) { /* lower bits */ |
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n = ffs(w); |
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} else { /* upper bits */ |
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w = (uint32_t)(v >> 32); |
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if (w) { |
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n = ffs(w); |
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if (n) |
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n += 32; |
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} |
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} |
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return n - 1; |
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} |
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/* Return whether bitmap is empty (1 == empty) */ |
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extern int xfs_bitmap_empty(uint *map, uint size); |
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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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