104 lines · c
1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef _TOOLS_LINUX_BITOPS_H_3#define _TOOLS_LINUX_BITOPS_H_4 5#include <asm/types.h>6#include <limits.h>7#ifndef __WORDSIZE8#define __WORDSIZE (__SIZEOF_LONG__ * 8)9#endif10 11#ifndef BITS_PER_LONG12# define BITS_PER_LONG __WORDSIZE13#endif14#include <linux/bits.h>15#include <linux/compiler.h>16 17#define BITS_PER_TYPE(type) (sizeof(type) * BITS_PER_BYTE)18#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_TYPE(long))19#define BITS_TO_U64(nr) DIV_ROUND_UP(nr, BITS_PER_TYPE(u64))20#define BITS_TO_U32(nr) DIV_ROUND_UP(nr, BITS_PER_TYPE(u32))21#define BITS_TO_BYTES(nr) DIV_ROUND_UP(nr, BITS_PER_TYPE(char))22 23#define BYTES_TO_BITS(nb) ((nb) * BITS_PER_BYTE)24 25extern unsigned int __sw_hweight8(unsigned int w);26extern unsigned int __sw_hweight16(unsigned int w);27extern unsigned int __sw_hweight32(unsigned int w);28extern unsigned long __sw_hweight64(__u64 w);29 30/*31 * Defined here because those may be needed by architecture-specific static32 * inlines.33 */34 35#define bitop(op, nr, addr) \36 op(nr, addr)37 38#define __set_bit(nr, addr) bitop(___set_bit, nr, addr)39#define __clear_bit(nr, addr) bitop(___clear_bit, nr, addr)40#define __change_bit(nr, addr) bitop(___change_bit, nr, addr)41#define __test_and_set_bit(nr, addr) bitop(___test_and_set_bit, nr, addr)42#define __test_and_clear_bit(nr, addr) bitop(___test_and_clear_bit, nr, addr)43#define __test_and_change_bit(nr, addr) bitop(___test_and_change_bit, nr, addr)44#define test_bit(nr, addr) bitop(_test_bit, nr, addr)45 46/*47 * Include this here because some architectures need generic_ffs/fls in48 * scope49 *50 * XXX: this needs to be asm/bitops.h, when we get to per arch optimizations51 */52#include <asm-generic/bitops.h>53 54#define for_each_set_bit(bit, addr, size) \55 for ((bit) = find_first_bit((addr), (size)); \56 (bit) < (size); \57 (bit) = find_next_bit((addr), (size), (bit) + 1))58 59#define for_each_clear_bit(bit, addr, size) \60 for ((bit) = find_first_zero_bit((addr), (size)); \61 (bit) < (size); \62 (bit) = find_next_zero_bit((addr), (size), (bit) + 1))63 64/* same as for_each_set_bit() but use bit as value to start with */65#define for_each_set_bit_from(bit, addr, size) \66 for ((bit) = find_next_bit((addr), (size), (bit)); \67 (bit) < (size); \68 (bit) = find_next_bit((addr), (size), (bit) + 1))69 70static inline unsigned long hweight_long(unsigned long w)71{72 return sizeof(w) == 4 ? hweight32(w) : hweight64(w);73}74 75static inline unsigned int fls_long(unsigned long l)76{77 if (sizeof(l) == 4)78 return fls(l);79 return fls64(l);80}81 82/**83 * rol32 - rotate a 32-bit value left84 * @word: value to rotate85 * @shift: bits to roll86 */87static inline __u32 rol32(__u32 word, unsigned int shift)88{89 return (word << shift) | (word >> ((-shift) & 31));90}91 92/**93 * sign_extend64 - sign extend a 64-bit value using specified bit as sign-bit94 * @value: value to sign extend95 * @index: 0 based bit index (0<=index<64) to sign bit96 */97static __always_inline __s64 sign_extend64(__u64 value, int index)98{99 __u8 shift = 63 - index;100 return (__s64)(value << shift) >> shift;101}102 103#endif104