Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _LINUX_BITOPS_H |
| 2 | #define _LINUX_BITOPS_H |
| 3 | #include <asm/types.h> |
| 4 | |
Jiri Slaby | d05be13 | 2007-10-18 23:40:31 -0700 | [diff] [blame] | 5 | #ifdef __KERNEL__ |
Jiri Slaby | 93043ec | 2007-10-18 23:40:35 -0700 | [diff] [blame] | 6 | #define BIT(nr) (1UL << (nr)) |
Jiri Slaby | d05be13 | 2007-10-18 23:40:31 -0700 | [diff] [blame] | 7 | #define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG)) |
| 8 | #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) |
Jiri Slaby | d05be13 | 2007-10-18 23:40:31 -0700 | [diff] [blame] | 9 | #define BITS_PER_BYTE 8 |
Eric Dumazet | ede9c69 | 2008-04-29 00:58:35 -0700 | [diff] [blame] | 10 | #define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long)) |
Jiri Slaby | d05be13 | 2007-10-18 23:40:31 -0700 | [diff] [blame] | 11 | #endif |
| 12 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | * Include this here because some architectures need generic_ffs/fls in |
| 15 | * scope |
| 16 | */ |
| 17 | #include <asm/bitops.h> |
| 18 | |
Shannon Nelson | 3e03745 | 2007-10-16 01:27:40 -0700 | [diff] [blame] | 19 | #define for_each_bit(bit, addr, size) \ |
| 20 | for ((bit) = find_first_bit((addr), (size)); \ |
| 21 | (bit) < (size); \ |
| 22 | (bit) = find_next_bit((addr), (size), (bit) + 1)) |
| 23 | |
| 24 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | static __inline__ int get_bitmask_order(unsigned int count) |
| 26 | { |
| 27 | int order; |
| 28 | |
| 29 | order = fls(count); |
| 30 | return order; /* We could be slightly more clever with -1 here... */ |
| 31 | } |
| 32 | |
Siddha, Suresh B | 94605ef | 2005-11-05 17:25:54 +0100 | [diff] [blame] | 33 | static __inline__ int get_count_order(unsigned int count) |
| 34 | { |
| 35 | int order; |
| 36 | |
| 37 | order = fls(count) - 1; |
| 38 | if (count & (count - 1)) |
| 39 | order++; |
| 40 | return order; |
| 41 | } |
| 42 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | static inline unsigned long hweight_long(unsigned long w) |
| 44 | { |
Akinobu Mita | e9bebd6 | 2006-03-26 01:39:55 -0800 | [diff] [blame] | 45 | return sizeof(w) == 4 ? hweight32(w) : hweight64(w); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | } |
| 47 | |
Robert P. J. Day | 45f8bde | 2007-01-26 00:57:09 -0800 | [diff] [blame] | 48 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | * rol32 - rotate a 32-bit value left |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | * @word: value to rotate |
| 51 | * @shift: bits to roll |
| 52 | */ |
| 53 | static inline __u32 rol32(__u32 word, unsigned int shift) |
| 54 | { |
| 55 | return (word << shift) | (word >> (32 - shift)); |
| 56 | } |
| 57 | |
Robert P. J. Day | 45f8bde | 2007-01-26 00:57:09 -0800 | [diff] [blame] | 58 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | * ror32 - rotate a 32-bit value right |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | * @word: value to rotate |
| 61 | * @shift: bits to roll |
| 62 | */ |
| 63 | static inline __u32 ror32(__u32 word, unsigned int shift) |
| 64 | { |
| 65 | return (word >> shift) | (word << (32 - shift)); |
| 66 | } |
| 67 | |
Harvey Harrison | 3afe392 | 2008-03-28 14:16:01 -0700 | [diff] [blame] | 68 | /** |
| 69 | * rol16 - rotate a 16-bit value left |
| 70 | * @word: value to rotate |
| 71 | * @shift: bits to roll |
| 72 | */ |
| 73 | static inline __u16 rol16(__u16 word, unsigned int shift) |
| 74 | { |
| 75 | return (word << shift) | (word >> (16 - shift)); |
| 76 | } |
| 77 | |
| 78 | /** |
| 79 | * ror16 - rotate a 16-bit value right |
| 80 | * @word: value to rotate |
| 81 | * @shift: bits to roll |
| 82 | */ |
| 83 | static inline __u16 ror16(__u16 word, unsigned int shift) |
| 84 | { |
| 85 | return (word >> shift) | (word << (16 - shift)); |
| 86 | } |
| 87 | |
| 88 | /** |
| 89 | * rol8 - rotate an 8-bit value left |
| 90 | * @word: value to rotate |
| 91 | * @shift: bits to roll |
| 92 | */ |
| 93 | static inline __u8 rol8(__u8 word, unsigned int shift) |
| 94 | { |
| 95 | return (word << shift) | (word >> (8 - shift)); |
| 96 | } |
| 97 | |
| 98 | /** |
| 99 | * ror8 - rotate an 8-bit value right |
| 100 | * @word: value to rotate |
| 101 | * @shift: bits to roll |
| 102 | */ |
| 103 | static inline __u8 ror8(__u8 word, unsigned int shift) |
| 104 | { |
| 105 | return (word >> shift) | (word << (8 - shift)); |
| 106 | } |
| 107 | |
Andrew Morton | 962749a | 2006-03-25 03:08:01 -0800 | [diff] [blame] | 108 | static inline unsigned fls_long(unsigned long l) |
| 109 | { |
| 110 | if (sizeof(l) == 4) |
| 111 | return fls(l); |
| 112 | return fls64(l); |
| 113 | } |
| 114 | |
Alexander van Heukelum | 64970b6 | 2008-03-11 16:17:19 +0100 | [diff] [blame] | 115 | #ifdef __KERNEL__ |
Alexander van Heukelum | 77b9bd9 | 2008-04-01 11:46:19 +0200 | [diff] [blame] | 116 | #ifdef CONFIG_GENERIC_FIND_FIRST_BIT |
Alexander van Heukelum | 77b9bd9 | 2008-04-01 11:46:19 +0200 | [diff] [blame] | 117 | |
| 118 | /** |
| 119 | * find_first_bit - find the first set bit in a memory region |
| 120 | * @addr: The address to start the search at |
| 121 | * @size: The maximum size to search |
| 122 | * |
| 123 | * Returns the bit number of the first set bit. |
| 124 | */ |
Thomas Gleixner | fee4b19 | 2008-04-29 12:01:02 +0200 | [diff] [blame] | 125 | extern unsigned long find_first_bit(const unsigned long *addr, |
| 126 | unsigned long size); |
Alexander van Heukelum | 77b9bd9 | 2008-04-01 11:46:19 +0200 | [diff] [blame] | 127 | |
| 128 | /** |
| 129 | * find_first_zero_bit - find the first cleared bit in a memory region |
| 130 | * @addr: The address to start the search at |
| 131 | * @size: The maximum size to search |
| 132 | * |
| 133 | * Returns the bit number of the first cleared bit. |
| 134 | */ |
Thomas Gleixner | fee4b19 | 2008-04-29 12:01:02 +0200 | [diff] [blame] | 135 | extern unsigned long find_first_zero_bit(const unsigned long *addr, |
| 136 | unsigned long size); |
Alexander van Heukelum | 77b9bd9 | 2008-04-01 11:46:19 +0200 | [diff] [blame] | 137 | #endif /* CONFIG_GENERIC_FIND_FIRST_BIT */ |
| 138 | |
Rusty Russell | ab53d47 | 2009-01-01 10:12:19 +1030 | [diff] [blame^] | 139 | #ifdef CONFIG_GENERIC_FIND_LAST_BIT |
| 140 | /** |
| 141 | * find_last_bit - find the last set bit in a memory region |
| 142 | * @addr: The address to start the search at |
| 143 | * @size: The maximum size to search |
| 144 | * |
| 145 | * Returns the bit number of the first set bit, or size. |
| 146 | */ |
| 147 | extern unsigned long find_last_bit(const unsigned long *addr, |
| 148 | unsigned long size); |
| 149 | #endif /* CONFIG_GENERIC_FIND_LAST_BIT */ |
| 150 | |
Alexander van Heukelum | 64970b6 | 2008-03-11 16:17:19 +0100 | [diff] [blame] | 151 | #ifdef CONFIG_GENERIC_FIND_NEXT_BIT |
Alexander van Heukelum | 64970b6 | 2008-03-11 16:17:19 +0100 | [diff] [blame] | 152 | |
| 153 | /** |
| 154 | * find_next_bit - find the next set bit in a memory region |
| 155 | * @addr: The address to base the search on |
| 156 | * @offset: The bitnumber to start searching at |
| 157 | * @size: The bitmap size in bits |
| 158 | */ |
Thomas Gleixner | fee4b19 | 2008-04-29 12:01:02 +0200 | [diff] [blame] | 159 | extern unsigned long find_next_bit(const unsigned long *addr, |
| 160 | unsigned long size, unsigned long offset); |
Alexander van Heukelum | 64970b6 | 2008-03-11 16:17:19 +0100 | [diff] [blame] | 161 | |
| 162 | /** |
| 163 | * find_next_zero_bit - find the next cleared bit in a memory region |
| 164 | * @addr: The address to base the search on |
| 165 | * @offset: The bitnumber to start searching at |
| 166 | * @size: The bitmap size in bits |
| 167 | */ |
Alexander van Heukelum | 64970b6 | 2008-03-11 16:17:19 +0100 | [diff] [blame] | 168 | |
Thomas Gleixner | fee4b19 | 2008-04-29 12:01:02 +0200 | [diff] [blame] | 169 | extern unsigned long find_next_zero_bit(const unsigned long *addr, |
| 170 | unsigned long size, |
| 171 | unsigned long offset); |
Alexander van Heukelum | 64970b6 | 2008-03-11 16:17:19 +0100 | [diff] [blame] | 172 | |
Alexander van Heukelum | 64970b6 | 2008-03-11 16:17:19 +0100 | [diff] [blame] | 173 | #endif /* CONFIG_GENERIC_FIND_NEXT_BIT */ |
| 174 | #endif /* __KERNEL__ */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | #endif |