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 13 extern unsigned int __sw_hweight8(unsigned int w); 14 extern unsigned int __sw_hweight16(unsigned int w); 15 extern unsigned int __sw_hweight32(unsigned int w); 16 extern 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 46 static __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 54 static __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 64 static 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 */ 74 static 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 */ 84 static 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 */ 94 static 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 */ 104 static 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 */ 114 static 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 */ 124 static 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 */ 134 static 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 */ 144 static 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 */ 154 static inline __s32 sign_extend32(__u32 value, int index) 155 { 156 __u8 shift = 31 - index; 157 return (__s32)(value << shift) >> shift; 158 } 159 160 static 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 */ 175 static 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 */ 196 extern unsigned long find_last_bit(const unsigned long *addr, 197 unsigned long size); 198 #endif 199 200 #endif /* __KERNEL__ */ 201 #endif 202