LCOV - code coverage report
Current view: top level - lkbce/include/linux - bitops.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 6 0.0 %
Date: 2017-01-25 Functions: 0 1 0.0 %

          Line data    Source code
       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             : /*
      14             :  * Include this here because some architectures need generic_ffs/fls in
      15             :  * scope
      16             :  */
      17             : #include <asm/bitops.h>
      18             : 
      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             : 
      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             : 
      33             : static __inline__ int get_count_order(unsigned int count)
      34             : {
      35           0 :         int order;
      36           0 :         
      37           0 :         order = fls(count) - 1;
      38           0 :         if (count & (count - 1))
      39           0 :                 order++;
      40           0 :         return order;
      41             : }
      42             : 
      43             : static inline unsigned long hweight_long(unsigned long w)
      44             : {
      45             :         return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
      46             : }
      47             : 
      48             : /**
      49             :  * rol32 - rotate a 32-bit value left
      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             : 
      58             : /**
      59             :  * ror32 - rotate a 32-bit value right
      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             : 
      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             : 
     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             : 
     115             : /**
     116             :  * __ffs64 - find first set bit in a 64 bit word
     117             :  * @word: The 64 bit word
     118             :  *
     119             :  * On 64 bit arches this is a synomyn for __ffs
     120             :  * The result is not defined if no bits are set, so check that @word
     121             :  * is non-zero before calling this.
     122             :  */
     123             : static inline unsigned long __ffs64(u64 word)
     124             : {
     125             : #if BITS_PER_LONG == 32
     126             :         if (((u32)word) == 0UL)
     127             :                 return __ffs((u32)(word >> 32)) + 32;
     128             : #elif BITS_PER_LONG != 64
     129             : #error BITS_PER_LONG not 32 or 64
     130             : #endif
     131             :         return __ffs((unsigned long)word);
     132             : }
     133             : 
     134             : #ifdef __KERNEL__
     135             : #ifdef CONFIG_GENERIC_FIND_FIRST_BIT
     136             : 
     137             : /**
     138             :  * find_first_bit - find the first set bit in a memory region
     139             :  * @addr: The address to start the search at
     140             :  * @size: The maximum size to search
     141             :  *
     142             :  * Returns the bit number of the first set bit.
     143             :  */
     144             : extern unsigned long find_first_bit(const unsigned long *addr,
     145             :                                     unsigned long size);
     146             : 
     147             : /**
     148             :  * find_first_zero_bit - find the first cleared bit in a memory region
     149             :  * @addr: The address to start the search at
     150             :  * @size: The maximum size to search
     151             :  *
     152             :  * Returns the bit number of the first cleared bit.
     153             :  */
     154             : extern unsigned long find_first_zero_bit(const unsigned long *addr,
     155             :                                          unsigned long size);
     156             : #endif /* CONFIG_GENERIC_FIND_FIRST_BIT */
     157             : 
     158             : #ifdef CONFIG_GENERIC_FIND_LAST_BIT
     159             : /**
     160             :  * find_last_bit - find the last set bit in a memory region
     161             :  * @addr: The address to start the search at
     162             :  * @size: The maximum size to search
     163             :  *
     164             :  * Returns the bit number of the first set bit, or size.
     165             :  */
     166             : extern unsigned long find_last_bit(const unsigned long *addr,
     167             :                                    unsigned long size);
     168             : #endif /* CONFIG_GENERIC_FIND_LAST_BIT */
     169             : 
     170             : #ifdef CONFIG_GENERIC_FIND_NEXT_BIT
     171             : 
     172             : /**
     173             :  * find_next_bit - find the next set bit in a memory region
     174             :  * @addr: The address to base the search on
     175             :  * @offset: The bitnumber to start searching at
     176             :  * @size: The bitmap size in bits
     177             :  */
     178             : extern unsigned long find_next_bit(const unsigned long *addr,
     179             :                                    unsigned long size, unsigned long offset);
     180             : 
     181             : /**
     182             :  * find_next_zero_bit - find the next cleared bit in a memory region
     183             :  * @addr: The address to base the search on
     184             :  * @offset: The bitnumber to start searching at
     185             :  * @size: The bitmap size in bits
     186             :  */
     187             : 
     188             : extern unsigned long find_next_zero_bit(const unsigned long *addr,
     189             :                                         unsigned long size,
     190             :                                         unsigned long offset);
     191             : 
     192             : #endif /* CONFIG_GENERIC_FIND_NEXT_BIT */
     193             : #endif /* __KERNEL__ */
     194             : #endif

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