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 23 extern unsigned int __sw_hweight8(unsigned int w); 24 extern unsigned int __sw_hweight16(unsigned int w); 25 extern unsigned int __sw_hweight32(unsigned int w); 26 extern unsigned long __sw_hweight64(__u64 w); 27 28 /* 29 * Include this here because some architectures need generic_ffs/fls in 30 * scope 31 * 32 * XXX: this needs to be asm/bitops.h, when we get to per arch optimizations 33 */ 34 #include <asm-generic/bitops.h> 35 36 #define for_each_set_bit(bit, addr, size) \ 37 for ((bit) = find_first_bit((addr), (size)); \ 38 (bit) < (size); \ 39 (bit) = find_next_bit((addr), (size), (bit) + 1)) 40 41 #define for_each_clear_bit(bit, addr, size) \ 42 for ((bit) = find_first_zero_bit((addr), (size)); \ 43 (bit) < (size); \ 44 (bit) = find_next_zero_bit((addr), (size), (bit) + 1)) 45 46 /* same as for_each_set_bit() but use bit as value to start with */ 47 #define for_each_set_bit_from(bit, addr, size) \ 48 for ((bit) = find_next_bit((addr), (size), (bit)); \ 49 (bit) < (size); \ 50 (bit) = find_next_bit((addr), (size), (bit) + 1)) 51 52 static inline unsigned long hweight_long(unsigned long w) 53 { 54 return sizeof(w) == 4 ? hweight32(w) : hweight64(w); 55 } 56 57 static inline unsigned fls_long(unsigned long l) 58 { 59 if (sizeof(l) == 4) 60 return fls(l); 61 return fls64(l); 62 } 63 64 /** 65 * rol32 - rotate a 32-bit value left 66 * @word: value to rotate 67 * @shift: bits to roll 68 */ 69 static inline __u32 rol32(__u32 word, unsigned int shift) 70 { 71 return (word << shift) | (word >> ((-shift) & 31)); 72 } 73 74 #endif 75