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 <linux/compiler.h> 7 8 #ifndef __WORDSIZE 9 #define __WORDSIZE (__SIZEOF_LONG__ * 8) 10 #endif 11 12 #ifndef BITS_PER_LONG 13 # define BITS_PER_LONG __WORDSIZE 14 #endif 15 16 #define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG)) 17 #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) 18 #define BITS_PER_BYTE 8 19 #define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long)) 20 #define BITS_TO_U64(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(u64)) 21 #define BITS_TO_U32(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(u32)) 22 #define BITS_TO_BYTES(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE) 23 24 extern unsigned int __sw_hweight8(unsigned int w); 25 extern unsigned int __sw_hweight16(unsigned int w); 26 extern unsigned int __sw_hweight32(unsigned int w); 27 extern unsigned long __sw_hweight64(__u64 w); 28 29 /* 30 * Include this here because some architectures need generic_ffs/fls in 31 * scope 32 * 33 * XXX: this needs to be asm/bitops.h, when we get to per arch optimizations 34 */ 35 #include <asm-generic/bitops.h> 36 37 #define for_each_set_bit(bit, addr, size) \ 38 for ((bit) = find_first_bit((addr), (size)); \ 39 (bit) < (size); \ 40 (bit) = find_next_bit((addr), (size), (bit) + 1)) 41 42 #define for_each_clear_bit(bit, addr, size) \ 43 for ((bit) = find_first_zero_bit((addr), (size)); \ 44 (bit) < (size); \ 45 (bit) = find_next_zero_bit((addr), (size), (bit) + 1)) 46 47 /* same as for_each_set_bit() but use bit as value to start with */ 48 #define for_each_set_bit_from(bit, addr, size) \ 49 for ((bit) = find_next_bit((addr), (size), (bit)); \ 50 (bit) < (size); \ 51 (bit) = find_next_bit((addr), (size), (bit) + 1)) 52 53 static inline unsigned long hweight_long(unsigned long w) 54 { 55 return sizeof(w) == 4 ? hweight32(w) : hweight64(w); 56 } 57 58 static inline unsigned fls_long(unsigned long l) 59 { 60 if (sizeof(l) == 4) 61 return fls(l); 62 return fls64(l); 63 } 64 65 /** 66 * rol32 - rotate a 32-bit value left 67 * @word: value to rotate 68 * @shift: bits to roll 69 */ 70 static inline __u32 rol32(__u32 word, unsigned int shift) 71 { 72 return (word << shift) | (word >> ((-shift) & 31)); 73 } 74 75 #endif 76