Linux kernel mirror (for testing)
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linux
1#ifndef _PERF_BITOPS_H
2#define _PERF_BITOPS_H
3
4#include <string.h>
5#include <linux/bitops.h>
6#include <stdlib.h>
7
8#define DECLARE_BITMAP(name,bits) \
9 unsigned long name[BITS_TO_LONGS(bits)]
10
11int __bitmap_weight(const unsigned long *bitmap, int bits);
12void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
13 const unsigned long *bitmap2, int bits);
14int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1,
15 const unsigned long *bitmap2, unsigned int bits);
16
17#define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1)))
18
19#define BITMAP_LAST_WORD_MASK(nbits) \
20( \
21 ((nbits) % BITS_PER_LONG) ? \
22 (1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL \
23)
24
25#define small_const_nbits(nbits) \
26 (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
27
28static inline void bitmap_zero(unsigned long *dst, int nbits)
29{
30 if (small_const_nbits(nbits))
31 *dst = 0UL;
32 else {
33 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
34 memset(dst, 0, len);
35 }
36}
37
38static inline int bitmap_weight(const unsigned long *src, int nbits)
39{
40 if (small_const_nbits(nbits))
41 return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
42 return __bitmap_weight(src, nbits);
43}
44
45static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,
46 const unsigned long *src2, int nbits)
47{
48 if (small_const_nbits(nbits))
49 *dst = *src1 | *src2;
50 else
51 __bitmap_or(dst, src1, src2, nbits);
52}
53
54/**
55 * test_and_set_bit - Set a bit and return its old value
56 * @nr: Bit to set
57 * @addr: Address to count from
58 */
59static inline int test_and_set_bit(int nr, unsigned long *addr)
60{
61 unsigned long mask = BIT_MASK(nr);
62 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
63 unsigned long old;
64
65 old = *p;
66 *p = old | mask;
67
68 return (old & mask) != 0;
69}
70
71/**
72 * bitmap_alloc - Allocate bitmap
73 * @nr: Bit to set
74 */
75static inline unsigned long *bitmap_alloc(int nbits)
76{
77 return calloc(1, BITS_TO_LONGS(nbits) * sizeof(unsigned long));
78}
79
80/*
81 * bitmap_scnprintf - print bitmap list into buffer
82 * @bitmap: bitmap
83 * @nbits: size of bitmap
84 * @buf: buffer to store output
85 * @size: size of @buf
86 */
87size_t bitmap_scnprintf(unsigned long *bitmap, int nbits,
88 char *buf, size_t size);
89
90/**
91 * bitmap_and - Do logical and on bitmaps
92 * @dst: resulting bitmap
93 * @src1: operand 1
94 * @src2: operand 2
95 * @nbits: size of bitmap
96 */
97static inline int bitmap_and(unsigned long *dst, const unsigned long *src1,
98 const unsigned long *src2, unsigned int nbits)
99{
100 if (small_const_nbits(nbits))
101 return (*dst = *src1 & *src2 & BITMAP_LAST_WORD_MASK(nbits)) != 0;
102 return __bitmap_and(dst, src1, src2, nbits);
103}
104
105#endif /* _PERF_BITOPS_H */