1 #ifndef _TOOLS_LINUX_BITOPS_H_
2 #define _TOOLS_LINUX_BITOPS_H_
3
4 #include <asm/types.h>
5 #include <linux/kernel.h>
6 #include <linux/compiler.h>
7
8 #ifndef __WORDSIZE
9 #define __WORDSIZE (__SIZEOF_LONG__ * 8)
10 #endif
11
12 #define BITS_PER_LONG __WORDSIZE
13
14 #define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
15 #define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
16 #define BITS_PER_BYTE 8
17 #define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
18 #define BITS_TO_U64(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(u64))
19 #define BITS_TO_U32(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(u32))
20 #define BITS_TO_BYTES(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE)
21
22 extern unsigned int __sw_hweight8(unsigned int w);
23 extern unsigned int __sw_hweight16(unsigned int w);
24 extern unsigned int __sw_hweight32(unsigned int w);
25 extern unsigned long __sw_hweight64(__u64 w);
26
27 /*
28 * Include this here because some architectures need generic_ffs/fls in
29 * scope
30 *
31 * XXX: this needs to be asm/bitops.h, when we get to per arch optimizations
32 */
33 #include <asm-generic/bitops.h>
34
35 #define for_each_set_bit(bit, addr, size) \
36 for ((bit) = find_first_bit((addr), (size)); \
37 (bit) < (size); \
38 (bit) = find_next_bit((addr), (size), (bit) + 1))
39
40 /* same as for_each_set_bit() but use bit as value to start with */
41 #define for_each_set_bit_from(bit, addr, size) \
42 for ((bit) = find_next_bit((addr), (size), (bit)); \
43 (bit) < (size); \
44 (bit) = find_next_bit((addr), (size), (bit) + 1))
45
hweight_long(unsigned long w)46 static inline unsigned long hweight_long(unsigned long w)
47 {
48 return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
49 }
50
fls_long(unsigned long l)51 static inline unsigned fls_long(unsigned long l)
52 {
53 if (sizeof(l) == 4)
54 return fls(l);
55 return fls64(l);
56 }
57
58 #endif
59