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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104/* SPDX-License-Identifier: GPL-2.0 */#ifndef _TOOLS_LINUX_BITOPS_H_#define _TOOLS_LINUX_BITOPS_H_
#include <asm/types.h>#include <limits.h>#ifndef __WORDSIZE#define __WORDSIZE (__SIZEOF_LONG__ * 8)#endif
#ifndef BITS_PER_LONG# define BITS_PER_LONG __WORDSIZE#endif#include <linux/bits.h>#include <linux/compiler.h>
#define BITS_PER_TYPE(type) (sizeof(type) * BITS_PER_BYTE)#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_TYPE(long))#define BITS_TO_U64(nr) DIV_ROUND_UP(nr, BITS_PER_TYPE(u64))#define BITS_TO_U32(nr) DIV_ROUND_UP(nr, BITS_PER_TYPE(u32))#define BITS_TO_BYTES(nr) DIV_ROUND_UP(nr, BITS_PER_TYPE(char))
#define BYTES_TO_BITS(nb) ((nb) * BITS_PER_BYTE)
extern unsigned int __sw_hweight8(unsigned int w);extern unsigned int __sw_hweight16(unsigned int w);extern unsigned int __sw_hweight32(unsigned int w);extern unsigned long __sw_hweight64(__u64 w);
/* * Defined here because those may be needed by architecture-specific static * inlines. */
#define bitop(op, nr, addr) \ op(nr, addr)
#define __set_bit(nr, addr) bitop(___set_bit, nr, addr)#define __clear_bit(nr, addr) bitop(___clear_bit, nr, addr)#define __change_bit(nr, addr) bitop(___change_bit, nr, addr)#define __test_and_set_bit(nr, addr) bitop(___test_and_set_bit, nr, addr)#define __test_and_clear_bit(nr, addr) bitop(___test_and_clear_bit, nr, addr)#define __test_and_change_bit(nr, addr) bitop(___test_and_change_bit, nr, addr)#define test_bit(nr, addr) bitop(_test_bit, nr, addr)
/* * Include this here because some architectures need generic_ffs/fls in * scope * * XXX: this needs to be asm/bitops.h, when we get to per arch optimizations */#include <asm-generic/bitops.h>
#define for_each_set_bit(bit, addr, size) \ for ((bit) = find_first_bit((addr), (size)); \ (bit) < (size); \ (bit) = find_next_bit((addr), (size), (bit) + 1))
#define for_each_clear_bit(bit, addr, size) \ for ((bit) = find_first_zero_bit((addr), (size)); \ (bit) < (size); \ (bit) = find_next_zero_bit((addr), (size), (bit) + 1))
/* same as for_each_set_bit() but use bit as value to start with */#define for_each_set_bit_from(bit, addr, size) \ for ((bit) = find_next_bit((addr), (size), (bit)); \ (bit) < (size); \ (bit) = find_next_bit((addr), (size), (bit) + 1))
static inline unsigned long hweight_long(unsigned long w){ return sizeof(w) == 4 ? hweight32(w) : hweight64(w);}
static inline unsigned int fls_long(unsigned long l){ if (sizeof(l) == 4) return fls(l); return fls64(l);}
/** * rol32 - rotate a 32-bit value left * @word: value to rotate * @shift: bits to roll */static inline __u32 rol32(__u32 word, unsigned int shift){ return (word << shift) | (word >> ((-shift) & 31));}
/** * sign_extend64 - sign extend a 64-bit value using specified bit as sign-bit * @value: value to sign extend * @index: 0 based bit index (0<=index<64) to sign bit */static __always_inline __s64 sign_extend64(__u64 value, int index){ __u8 shift = 63 - index; return (__s64)(value << shift) >> shift;}
#endif