1#ifndef _LINUX_BITOPS_H 2#define _LINUX_BITOPS_H 3#include <asm/types.h> 4 5#ifdef __KERNEL__ 6#define BIT(nr) (1UL << (nr)) 7#define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG)) 8#define BIT_WORD(nr) ((nr) / BITS_PER_LONG) 9#define BITS_PER_BYTE 8 10#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long)) 11#endif 12 13extern unsigned int __sw_hweight8(unsigned int w); 14extern unsigned int __sw_hweight16(unsigned int w); 15extern unsigned int __sw_hweight32(unsigned int w); 16extern unsigned long __sw_hweight64(__u64 w); 17 18/* 19 * Include this here because some architectures need generic_ffs/fls in 20 * scope 21 */ 22#include <asm/bitops.h> 23 24#define for_each_set_bit(bit, addr, size) \ 25 for ((bit) = find_first_bit((addr), (size)); \ 26 (bit) < (size); \ 27 (bit) = find_next_bit((addr), (size), (bit) + 1)) 28 29/* same as for_each_set_bit() but use bit as value to start with */ 30#define for_each_set_bit_from(bit, addr, size) \ 31 for ((bit) = find_next_bit((addr), (size), (bit)); \ 32 (bit) < (size); \ 33 (bit) = find_next_bit((addr), (size), (bit) + 1)) 34 35#define for_each_clear_bit(bit, addr, size) \ 36 for ((bit) = find_first_zero_bit((addr), (size)); \ 37 (bit) < (size); \ 38 (bit) = find_next_zero_bit((addr), (size), (bit) + 1)) 39 40/* same as for_each_clear_bit() but use bit as value to start with */ 41#define for_each_clear_bit_from(bit, addr, size) \ 42 for ((bit) = find_next_zero_bit((addr), (size), (bit)); \ 43 (bit) < (size); \ 44 (bit) = find_next_zero_bit((addr), (size), (bit) + 1)) 45 46static __inline__ int get_bitmask_order(unsigned int count) 47{ 48 int order; 49 50 order = fls(count); 51 return order; /* We could be slightly more clever with -1 here... */ 52} 53 54static __inline__ int get_count_order(unsigned int count) 55{ 56 int order; 57 58 order = fls(count) - 1; 59 if (count & (count - 1)) 60 order++; 61 return order; 62} 63 64static inline unsigned long hweight_long(unsigned long w) 65{ 66 return sizeof(w) == 4 ? hweight32(w) : hweight64(w); 67} 68 69/** 70 * rol64 - rotate a 64-bit value left 71 * @word: value to rotate 72 * @shift: bits to roll 73 */ 74static inline __u64 rol64(__u64 word, unsigned int shift) 75{ 76 return (word << shift) | (word >> (64 - shift)); 77} 78 79/** 80 * ror64 - rotate a 64-bit value right 81 * @word: value to rotate 82 * @shift: bits to roll 83 */ 84static inline __u64 ror64(__u64 word, unsigned int shift) 85{ 86 return (word >> shift) | (word << (64 - shift)); 87} 88 89/** 90 * rol32 - rotate a 32-bit value left 91 * @word: value to rotate 92 * @shift: bits to roll 93 */ 94static inline __u32 rol32(__u32 word, unsigned int shift) 95{ 96 return (word << shift) | (word >> (32 - shift)); 97} 98 99/** 100 * ror32 - rotate a 32-bit value right 101 * @word: value to rotate 102 * @shift: bits to roll 103 */ 104static inline __u32 ror32(__u32 word, unsigned int shift) 105{ 106 return (word >> shift) | (word << (32 - shift)); 107} 108 109/** 110 * rol16 - rotate a 16-bit value left 111 * @word: value to rotate 112 * @shift: bits to roll 113 */ 114static inline __u16 rol16(__u16 word, unsigned int shift) 115{ 116 return (word << shift) | (word >> (16 - shift)); 117} 118 119/** 120 * ror16 - rotate a 16-bit value right 121 * @word: value to rotate 122 * @shift: bits to roll 123 */ 124static inline __u16 ror16(__u16 word, unsigned int shift) 125{ 126 return (word >> shift) | (word << (16 - shift)); 127} 128 129/** 130 * rol8 - rotate an 8-bit value left 131 * @word: value to rotate 132 * @shift: bits to roll 133 */ 134static inline __u8 rol8(__u8 word, unsigned int shift) 135{ 136 return (word << shift) | (word >> (8 - shift)); 137} 138 139/** 140 * ror8 - rotate an 8-bit value right 141 * @word: value to rotate 142 * @shift: bits to roll 143 */ 144static inline __u8 ror8(__u8 word, unsigned int shift) 145{ 146 return (word >> shift) | (word << (8 - shift)); 147} 148 149/** 150 * sign_extend32 - sign extend a 32-bit value using specified bit as sign-bit 151 * @value: value to sign extend 152 * @index: 0 based bit index (0<=index<32) to sign bit 153 */ 154static inline __s32 sign_extend32(__u32 value, int index) 155{ 156 __u8 shift = 31 - index; 157 return (__s32)(value << shift) >> shift; 158} 159 160static inline unsigned fls_long(unsigned long l) 161{ 162 if (sizeof(l) == 4) 163 return fls(l); 164 return fls64(l); 165} 166 167/** 168 * __ffs64 - find first set bit in a 64 bit word 169 * @word: The 64 bit word 170 * 171 * On 64 bit arches this is a synomyn for __ffs 172 * The result is not defined if no bits are set, so check that @word 173 * is non-zero before calling this. 174 */ 175static inline unsigned long __ffs64(u64 word) 176{ 177#if BITS_PER_LONG == 32 178 if (((u32)word) == 0UL) 179 return __ffs((u32)(word >> 32)) + 32; 180#elif BITS_PER_LONG != 64 181#error BITS_PER_LONG not 32 or 64 182#endif 183 return __ffs((unsigned long)word); 184} 185 186#ifdef __KERNEL__ 187 188#ifndef find_last_bit 189/** 190 * find_last_bit - find the last set bit in a memory region 191 * @addr: The address to start the search at 192 * @size: The maximum size to search 193 * 194 * Returns the bit number of the first set bit, or size. 195 */ 196extern unsigned long find_last_bit(const unsigned long *addr, 197 unsigned long size); 198#endif 199 200#endif /* __KERNEL__ */ 201#endif 202