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74 lines
2.1 KiB
74 lines
2.1 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _TOOLS_LINUX_BITOPS_H_ |
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#define _TOOLS_LINUX_BITOPS_H_ |
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#include <asm/types.h> |
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#include <limits.h> |
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#ifndef __WORDSIZE |
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#define __WORDSIZE (__SIZEOF_LONG__ * 8) |
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#endif |
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#ifndef BITS_PER_LONG |
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# define BITS_PER_LONG __WORDSIZE |
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#endif |
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#include <linux/bits.h> |
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#include <linux/compiler.h> |
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#define BITS_PER_TYPE(type) (sizeof(type) * BITS_PER_BYTE) |
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#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_TYPE(long)) |
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#define BITS_TO_U64(nr) DIV_ROUND_UP(nr, BITS_PER_TYPE(u64)) |
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#define BITS_TO_U32(nr) DIV_ROUND_UP(nr, BITS_PER_TYPE(u32)) |
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#define BITS_TO_BYTES(nr) DIV_ROUND_UP(nr, BITS_PER_TYPE(char)) |
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extern unsigned int __sw_hweight8(unsigned int w); |
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extern unsigned int __sw_hweight16(unsigned int w); |
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extern unsigned int __sw_hweight32(unsigned int w); |
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extern unsigned long __sw_hweight64(__u64 w); |
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/* |
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* Include this here because some architectures need generic_ffs/fls in |
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* scope |
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* |
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* XXX: this needs to be asm/bitops.h, when we get to per arch optimizations |
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*/ |
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#include <asm-generic/bitops.h> |
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#define for_each_set_bit(bit, addr, size) \ |
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for ((bit) = find_first_bit((addr), (size)); \ |
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(bit) < (size); \ |
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(bit) = find_next_bit((addr), (size), (bit) + 1)) |
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#define for_each_clear_bit(bit, addr, size) \ |
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for ((bit) = find_first_zero_bit((addr), (size)); \ |
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(bit) < (size); \ |
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(bit) = find_next_zero_bit((addr), (size), (bit) + 1)) |
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/* same as for_each_set_bit() but use bit as value to start with */ |
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#define for_each_set_bit_from(bit, addr, size) \ |
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for ((bit) = find_next_bit((addr), (size), (bit)); \ |
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(bit) < (size); \ |
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(bit) = find_next_bit((addr), (size), (bit) + 1)) |
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static inline unsigned long hweight_long(unsigned long w) |
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{ |
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return sizeof(w) == 4 ? hweight32(w) : hweight64(w); |
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} |
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static inline unsigned fls_long(unsigned long l) |
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{ |
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if (sizeof(l) == 4) |
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return fls(l); |
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return fls64(l); |
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} |
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/** |
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* rol32 - rotate a 32-bit value left |
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* @word: value to rotate |
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* @shift: bits to roll |
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*/ |
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static inline __u32 rol32(__u32 word, unsigned int shift) |
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{ |
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return (word << shift) | (word >> ((-shift) & 31)); |
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} |
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#endif
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