Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef _TOOLS_LINUX_BITOPS_H_
2#define _TOOLS_LINUX_BITOPS_H_
3
4#include <linux/kernel.h>
5#include <linux/compiler.h>
6#include <asm/hweight.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/*
23 * Include this here because some architectures need generic_ffs/fls in
24 * scope
25 *
26 * XXX: this needs to be asm/bitops.h, when we get to per arch optimizations
27 */
28#include <asm-generic/bitops.h>
29
30#define for_each_set_bit(bit, addr, size) \
31 for ((bit) = find_first_bit((addr), (size)); \
32 (bit) < (size); \
33 (bit) = find_next_bit((addr), (size), (bit) + 1))
34
35/* same as for_each_set_bit() but use bit as value to start with */
36#define for_each_set_bit_from(bit, addr, size) \
37 for ((bit) = find_next_bit((addr), (size), (bit)); \
38 (bit) < (size); \
39 (bit) = find_next_bit((addr), (size), (bit) + 1))
40
41static inline unsigned long hweight_long(unsigned long w)
42{
43 return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
44}
45
46static inline unsigned fls_long(unsigned long l)
47{
48 if (sizeof(l) == 4)
49 return fls(l);
50 return fls64(l);
51}
52
53#endif