Rev 1408 | Rev 1970 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1408 | serge | 1 | #ifndef _LINUX_BITOPS_H |
| 2 | #define _LINUX_BITOPS_H |
||
| 1964 | serge | 3 | #include |
| 1408 | serge | 4 | |
| 1964 | serge | 5 | #ifdef __KERNEL__ |
| 1408 | serge | 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)) |
||
| 1964 | serge | 11 | #endif |
| 1408 | serge | 12 | |
| 1964 | serge | 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 | |||
| 1408 | serge | 18 | /* |
| 19 | * Include this here because some architectures need generic_ffs/fls in |
||
| 20 | * scope |
||
| 21 | */ |
||
| 22 | #include |
||
| 23 | |||
| 1964 | serge | 24 | #define for_each_set_bit(bit, addr, size) \ |
| 1408 | serge | 25 | for ((bit) = find_first_bit((addr), (size)); \ |
| 26 | (bit) < (size); \ |
||
| 27 | (bit) = find_next_bit((addr), (size), (bit) + 1)) |
||
| 28 | |||
| 29 | static __inline__ int get_bitmask_order(unsigned int count) |
||
| 30 | { |
||
| 31 | int order; |
||
| 32 | |||
| 33 | order = fls(count); |
||
| 34 | return order; /* We could be slightly more clever with -1 here... */ |
||
| 35 | } |
||
| 36 | |||
| 37 | static __inline__ int get_count_order(unsigned int count) |
||
| 38 | { |
||
| 39 | int order; |
||
| 40 | |||
| 41 | order = fls(count) - 1; |
||
| 42 | if (count & (count - 1)) |
||
| 43 | order++; |
||
| 44 | return order; |
||
| 45 | } |
||
| 46 | |||
| 47 | static inline unsigned long hweight_long(unsigned long w) |
||
| 48 | { |
||
| 49 | return sizeof(w) == 4 ? hweight32(w) : hweight64(w); |
||
| 50 | } |
||
| 51 | |||
| 52 | /** |
||
| 53 | * rol32 - rotate a 32-bit value left |
||
| 54 | * @word: value to rotate |
||
| 55 | * @shift: bits to roll |
||
| 56 | */ |
||
| 57 | static inline __u32 rol32(__u32 word, unsigned int shift) |
||
| 58 | { |
||
| 59 | return (word << shift) | (word >> (32 - shift)); |
||
| 60 | } |
||
| 61 | |||
| 62 | /** |
||
| 63 | * ror32 - rotate a 32-bit value right |
||
| 64 | * @word: value to rotate |
||
| 65 | * @shift: bits to roll |
||
| 66 | */ |
||
| 67 | static inline __u32 ror32(__u32 word, unsigned int shift) |
||
| 68 | { |
||
| 69 | return (word >> shift) | (word << (32 - shift)); |
||
| 70 | } |
||
| 71 | |||
| 72 | /** |
||
| 73 | * rol16 - rotate a 16-bit value left |
||
| 74 | * @word: value to rotate |
||
| 75 | * @shift: bits to roll |
||
| 76 | */ |
||
| 77 | static inline __u16 rol16(__u16 word, unsigned int shift) |
||
| 78 | { |
||
| 79 | return (word << shift) | (word >> (16 - shift)); |
||
| 80 | } |
||
| 81 | |||
| 82 | /** |
||
| 83 | * ror16 - rotate a 16-bit value right |
||
| 84 | * @word: value to rotate |
||
| 85 | * @shift: bits to roll |
||
| 86 | */ |
||
| 87 | static inline __u16 ror16(__u16 word, unsigned int shift) |
||
| 88 | { |
||
| 89 | return (word >> shift) | (word << (16 - shift)); |
||
| 90 | } |
||
| 91 | |||
| 92 | /** |
||
| 93 | * rol8 - rotate an 8-bit value left |
||
| 94 | * @word: value to rotate |
||
| 95 | * @shift: bits to roll |
||
| 96 | */ |
||
| 97 | static inline __u8 rol8(__u8 word, unsigned int shift) |
||
| 98 | { |
||
| 99 | return (word << shift) | (word >> (8 - shift)); |
||
| 100 | } |
||
| 101 | |||
| 102 | /** |
||
| 103 | * ror8 - rotate an 8-bit value right |
||
| 104 | * @word: value to rotate |
||
| 105 | * @shift: bits to roll |
||
| 106 | */ |
||
| 107 | static inline __u8 ror8(__u8 word, unsigned int shift) |
||
| 108 | { |
||
| 109 | return (word >> shift) | (word << (8 - shift)); |
||
| 110 | } |
||
| 111 | |||
| 112 | static inline unsigned fls_long(unsigned long l) |
||
| 113 | { |
||
| 114 | if (sizeof(l) == 4) |
||
| 115 | return fls(l); |
||
| 116 | return fls64(l); |
||
| 117 | } |
||
| 118 | |||
| 119 | /** |
||
| 120 | * __ffs64 - find first set bit in a 64 bit word |
||
| 121 | * @word: The 64 bit word |
||
| 122 | * |
||
| 123 | * On 64 bit arches this is a synomyn for __ffs |
||
| 124 | * The result is not defined if no bits are set, so check that @word |
||
| 125 | * is non-zero before calling this. |
||
| 126 | */ |
||
| 127 | static inline unsigned long __ffs64(u64 word) |
||
| 128 | { |
||
| 129 | #if BITS_PER_LONG == 32 |
||
| 130 | if (((u32)word) == 0UL) |
||
| 131 | return __ffs((u32)(word >> 32)) + 32; |
||
| 132 | #elif BITS_PER_LONG != 64 |
||
| 133 | #error BITS_PER_LONG not 32 or 64 |
||
| 134 | #endif |
||
| 135 | return __ffs((unsigned long)word); |
||
| 136 | } |
||
| 137 | |||
| 138 | #ifdef __KERNEL__ |
||
| 139 | |||
| 140 | #ifdef CONFIG_GENERIC_FIND_LAST_BIT |
||
| 141 | /** |
||
| 142 | * find_last_bit - find the last set bit in a memory region |
||
| 143 | * @addr: The address to start the search at |
||
| 144 | * @size: The maximum size to search |
||
| 145 | * |
||
| 146 | * Returns the bit number of the first set bit, or size. |
||
| 147 | */ |
||
| 148 | extern unsigned long find_last_bit(const unsigned long *addr, |
||
| 149 | unsigned long size); |
||
| 150 | #endif /* CONFIG_GENERIC_FIND_LAST_BIT */ |
||
| 151 | |||
| 152 | #endif /* __KERNEL__ */ |
||
| 153 | #endif |