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 __WORDSIZE 8#define __WORDSIZE (__SIZEOF_LONG__ * 8) 9#endif 10 11#ifndef BITS_PER_LONG 12# define BITS_PER_LONG __WORDSIZE 13#endif 14#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 23extern unsigned int __sw_hweight8(unsigned int w); 24extern unsigned int __sw_hweight16(unsigned int w); 25extern unsigned int __sw_hweight32(unsigned int w); 26extern unsigned long __sw_hweight64(__u64 w); 27 28/* 29 * Defined here because those may be needed by architecture-specific static 30 * inlines. 31 */ 32 33#define bitop(op, nr, addr) \ 34 op(nr, addr) 35 36#define __set_bit(nr, addr) bitop(___set_bit, nr, addr) 37#define __clear_bit(nr, addr) bitop(___clear_bit, nr, addr) 38#define __change_bit(nr, addr) bitop(___change_bit, nr, addr) 39#define __test_and_set_bit(nr, addr) bitop(___test_and_set_bit, nr, addr) 40#define __test_and_clear_bit(nr, addr) bitop(___test_and_clear_bit, nr, addr) 41#define __test_and_change_bit(nr, addr) bitop(___test_and_change_bit, nr, addr) 42#define test_bit(nr, addr) bitop(_test_bit, nr, addr) 43 44/* 45 * Include this here because some architectures need generic_ffs/fls in 46 * scope 47 * 48 * XXX: this needs to be asm/bitops.h, when we get to per arch optimizations 49 */ 50#include <asm-generic/bitops.h> 51 52#define for_each_set_bit(bit, addr, size) \ 53 for ((bit) = find_first_bit((addr), (size)); \ 54 (bit) < (size); \ 55 (bit) = find_next_bit((addr), (size), (bit) + 1)) 56 57#define for_each_clear_bit(bit, addr, size) \ 58 for ((bit) = find_first_zero_bit((addr), (size)); \ 59 (bit) < (size); \ 60 (bit) = find_next_zero_bit((addr), (size), (bit) + 1)) 61 62/* same as for_each_set_bit() but use bit as value to start with */ 63#define for_each_set_bit_from(bit, addr, size) \ 64 for ((bit) = find_next_bit((addr), (size), (bit)); \ 65 (bit) < (size); \ 66 (bit) = find_next_bit((addr), (size), (bit) + 1)) 67 68static inline unsigned long hweight_long(unsigned long w) 69{ 70 return sizeof(w) == 4 ? hweight32(w) : hweight64(w); 71} 72 73static inline unsigned fls_long(unsigned long l) 74{ 75 if (sizeof(l) == 4) 76 return fls(l); 77 return fls64(l); 78} 79 80/** 81 * rol32 - rotate a 32-bit value left 82 * @word: value to rotate 83 * @shift: bits to roll 84 */ 85static inline __u32 rol32(__u32 word, unsigned int shift) 86{ 87 return (word << shift) | (word >> ((-shift) & 31)); 88} 89 90/** 91 * sign_extend64 - sign extend a 64-bit value using specified bit as sign-bit 92 * @value: value to sign extend 93 * @index: 0 based bit index (0<=index<64) to sign bit 94 */ 95static __always_inline __s64 sign_extend64(__u64 value, int index) 96{ 97 __u8 shift = 63 - index; 98 return (__s64)(value << shift) >> shift; 99} 100 101#endif 102