1 #ifndef _LINUX_BITOPS_H 2 #define _LINUX_BITOPS_H 3 #include <asm/types.h> 4 5 /* 6 * Include this here because some architectures need generic_ffs/fls in 7 * scope 8 */ 9 #include <asm/bitops.h> 10 get_bitmask_order(unsigned int count)11static __inline__ int get_bitmask_order(unsigned int count) 12 { 13 int order; 14 15 order = fls(count); 16 return order; /* We could be slightly more clever with -1 here... */ 17 } 18 get_count_order(unsigned int count)19static __inline__ int get_count_order(unsigned int count) 20 { 21 int order; 22 23 order = fls(count) - 1; 24 if (count & (count - 1)) 25 order++; 26 return order; 27 } 28 hweight_long(unsigned long w)29static inline unsigned long hweight_long(unsigned long w) 30 { 31 return sizeof(w) == 4 ? hweight32(w) : hweight64(w); 32 } 33 34 /* 35 * rol32 - rotate a 32-bit value left 36 * 37 * @word: value to rotate 38 * @shift: bits to roll 39 */ rol32(__u32 word,unsigned int shift)40static inline __u32 rol32(__u32 word, unsigned int shift) 41 { 42 return (word << shift) | (word >> (32 - shift)); 43 } 44 45 /* 46 * ror32 - rotate a 32-bit value right 47 * 48 * @word: value to rotate 49 * @shift: bits to roll 50 */ ror32(__u32 word,unsigned int shift)51static inline __u32 ror32(__u32 word, unsigned int shift) 52 { 53 return (word >> shift) | (word << (32 - shift)); 54 } 55 fls_long(unsigned long l)56static inline unsigned fls_long(unsigned long l) 57 { 58 if (sizeof(l) == 4) 59 return fls(l); 60 return fls64(l); 61 } 62 63 #endif 64