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 #ifndef __WORDSIZE 7 #define __WORDSIZE (__SIZEOF_LONG__ * 8) 8 #endif 9 10 #ifndef BITS_PER_LONG 11 # define BITS_PER_LONG __WORDSIZE 12 #endif 13 #include <linux/bits.h> 14 #include <linux/compiler.h> 15 16 #define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long)) 17 #define BITS_TO_U64(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(u64)) 18 #define BITS_TO_U32(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(u32)) 19 #define BITS_TO_BYTES(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE) 20 21 extern unsigned int __sw_hweight8(unsigned int w); 22 extern unsigned int __sw_hweight16(unsigned int w); 23 extern unsigned int __sw_hweight32(unsigned int w); 24 extern unsigned long __sw_hweight64(__u64 w); 25 26 /* 27 * Include this here because some architectures need generic_ffs/fls in 28 * scope 29 * 30 * XXX: this needs to be asm/bitops.h, when we get to per arch optimizations 31 */ 32 #include <asm-generic/bitops.h> 33 34 #define for_each_set_bit(bit, addr, size) \ 35 for ((bit) = find_first_bit((addr), (size)); \ 36 (bit) < (size); \ 37 (bit) = find_next_bit((addr), (size), (bit) + 1)) 38 39 #define for_each_clear_bit(bit, addr, size) \ 40 for ((bit) = find_first_zero_bit((addr), (size)); \ 41 (bit) < (size); \ 42 (bit) = find_next_zero_bit((addr), (size), (bit) + 1)) 43 44 /* same as for_each_set_bit() but use bit as value to start with */ 45 #define for_each_set_bit_from(bit, addr, size) \ 46 for ((bit) = find_next_bit((addr), (size), (bit)); \ 47 (bit) < (size); \ 48 (bit) = find_next_bit((addr), (size), (bit) + 1)) 49 50 static inline unsigned long hweight_long(unsigned long w) 51 { 52 return sizeof(w) == 4 ? hweight32(w) : hweight64(w); 53 } 54 55 static inline unsigned fls_long(unsigned long l) 56 { 57 if (sizeof(l) == 4) 58 return fls(l); 59 return fls64(l); 60 } 61 62 /** 63 * rol32 - rotate a 32-bit value left 64 * @word: value to rotate 65 * @shift: bits to roll 66 */ 67 static inline __u32 rol32(__u32 word, unsigned int shift) 68 { 69 return (word << shift) | (word >> ((-shift) & 31)); 70 } 71 72 #endif 73