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