| #ifndef _LINUX_BITOPS_H |
| #define _LINUX_BITOPS_H |
| #include <asm/types.h> |
| |
| #ifdef __KERNEL__ |
| #define BIT(nr) (1UL << (nr)) |
| #define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG)) |
| #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) |
| #define BITS_PER_BYTE 8 |
| #define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long)) |
| #endif |
| |
| extern unsigned int __sw_hweight8(unsigned int w); |
| extern unsigned int __sw_hweight16(unsigned int w); |
| extern unsigned int __sw_hweight32(unsigned int w); |
| extern unsigned long __sw_hweight64(__u64 w); |
| |
| /* |
| * Include this here because some architectures need generic_ffs/fls in |
| * scope |
| */ |
| #include <asm/bitops.h> |
| |
| #define for_each_set_bit(bit, addr, size) \ |
| for ((bit) = find_first_bit((addr), (size)); \ |
| (bit) < (size); \ |
| (bit) = find_next_bit((addr), (size), (bit) + 1)) |
| |
| /* same as for_each_set_bit() but use bit as value to start with */ |
| #define for_each_set_bit_cont(bit, addr, size) \ |
| for ((bit) = find_next_bit((addr), (size), (bit)); \ |
| (bit) < (size); \ |
| (bit) = find_next_bit((addr), (size), (bit) + 1)) |
| |
| static __inline__ int get_bitmask_order(unsigned int count) |
| { |
| int order; |
| |
| order = fls(count); |
| return order; /* We could be slightly more clever with -1 here... */ |
| } |
| |
| static __inline__ int get_count_order(unsigned int count) |
| { |
| int order; |
| |
| order = fls(count) - 1; |
| if (count & (count - 1)) |
| order++; |
| return order; |
| } |
| |
| static inline unsigned long hweight_long(unsigned long w) |
| { |
| return sizeof(w) == 4 ? hweight32(w) : hweight64(w); |
| } |
| |
| /** |
| * rol32 - rotate a 32-bit value left |
| * @word: value to rotate |
| * @shift: bits to roll |
| */ |
| static inline __u32 rol32(__u32 word, unsigned int shift) |
| { |
| return (word << shift) | (word >> (32 - shift)); |
| } |
| |
| /** |
| * ror32 - rotate a 32-bit value right |
| * @word: value to rotate |
| * @shift: bits to roll |
| */ |
| static inline __u32 ror32(__u32 word, unsigned int shift) |
| { |
| return (word >> shift) | (word << (32 - shift)); |
| } |
| |
| /** |
| * rol16 - rotate a 16-bit value left |
| * @word: value to rotate |
| * @shift: bits to roll |
| */ |
| static inline __u16 rol16(__u16 word, unsigned int shift) |
| { |
| return (word << shift) | (word >> (16 - shift)); |
| } |
| |
| /** |
| * ror16 - rotate a 16-bit value right |
| * @word: value to rotate |
| * @shift: bits to roll |
| */ |
| static inline __u16 ror16(__u16 word, unsigned int shift) |
| { |
| return (word >> shift) | (word << (16 - shift)); |
| } |
| |
| /** |
| * rol8 - rotate an 8-bit value left |
| * @word: value to rotate |
| * @shift: bits to roll |
| */ |
| static inline __u8 rol8(__u8 word, unsigned int shift) |
| { |
| return (word << shift) | (word >> (8 - shift)); |
| } |
| |
| /** |
| * ror8 - rotate an 8-bit value right |
| * @word: value to rotate |
| * @shift: bits to roll |
| */ |
| static inline __u8 ror8(__u8 word, unsigned int shift) |
| { |
| return (word >> shift) | (word << (8 - shift)); |
| } |
| |
| /** |
| * sign_extend32 - sign extend a 32-bit value using specified bit as sign-bit |
| * @value: value to sign extend |
| * @index: 0 based bit index (0<=index<32) to sign bit |
| */ |
| static inline __s32 sign_extend32(__u32 value, int index) |
| { |
| __u8 shift = 31 - index; |
| return (__s32)(value << shift) >> shift; |
| } |
| |
| static inline unsigned fls_long(unsigned long l) |
| { |
| if (sizeof(l) == 4) |
| return fls(l); |
| return fls64(l); |
| } |
| |
| /** |
| * __ffs64 - find first set bit in a 64 bit word |
| * @word: The 64 bit word |
| * |
| * On 64 bit arches this is a synomyn for __ffs |
| * The result is not defined if no bits are set, so check that @word |
| * is non-zero before calling this. |
| */ |
| static inline unsigned long __ffs64(u64 word) |
| { |
| #if BITS_PER_LONG == 32 |
| if (((u32)word) == 0UL) |
| return __ffs((u32)(word >> 32)) + 32; |
| #elif BITS_PER_LONG != 64 |
| #error BITS_PER_LONG not 32 or 64 |
| #endif |
| return __ffs((unsigned long)word); |
| } |
| |
| #ifdef __KERNEL__ |
| |
| #ifndef find_last_bit |
| /** |
| * find_last_bit - find the last set bit in a memory region |
| * @addr: The address to start the search at |
| * @size: The maximum size to search |
| * |
| * Returns the bit number of the first set bit, or size. |
| */ |
| extern unsigned long find_last_bit(const unsigned long *addr, |
| unsigned long size); |
| #endif |
| |
| #endif /* __KERNEL__ */ |
| #endif |