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#include <linux/kernel.h>
8
9#define DECLARE_BITMAP(name,bits) \
10 unsigned long name[BITS_TO_LONGS(bits)]
11
12int __bitmap_weight(const unsigned long *bitmap, int bits);
13void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
14 const unsigned long *bitmap2, int bits);
15int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1,
16 const unsigned long *bitmap2, unsigned int bits);
17
18#define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1)))
19
20#define BITMAP_LAST_WORD_MASK(nbits) \
21( \
22 ((nbits) % BITS_PER_LONG) ? \
23 (1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL \
24)
25
26#define small_const_nbits(nbits) \
27 (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
28
29static inline void bitmap_zero(unsigned long *dst, int nbits)
30{
31 if (small_const_nbits(nbits))
32 *dst = 0UL;
33 else {
34 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
35 memset(dst, 0, len);
36 }
37}
38
39static inline void bitmap_fill(unsigned long *dst, unsigned int nbits)
40{
41 unsigned int nlongs = BITS_TO_LONGS(nbits);
42 if (!small_const_nbits(nbits)) {
43 unsigned int len = (nlongs - 1) * sizeof(unsigned long);
44 memset(dst, 0xff, len);
45 }
46 dst[nlongs - 1] = BITMAP_LAST_WORD_MASK(nbits);
47}
48
49static inline int bitmap_empty(const unsigned long *src, unsigned nbits)
50{
51 if (small_const_nbits(nbits))
52 return ! (*src & BITMAP_LAST_WORD_MASK(nbits));
53
54 return find_first_bit(src, nbits) == nbits;
55}
56
57static inline int bitmap_full(const unsigned long *src, unsigned int nbits)
58{
59 if (small_const_nbits(nbits))
60 return ! (~(*src) & BITMAP_LAST_WORD_MASK(nbits));
61
62 return find_first_zero_bit(src, nbits) == nbits;
63}
64
65static inline int bitmap_weight(const unsigned long *src, int nbits)
66{
67 if (small_const_nbits(nbits))
68 return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
69 return __bitmap_weight(src, nbits);
70}
71
72static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,
73 const unsigned long *src2, int nbits)
74{
75 if (small_const_nbits(nbits))
76 *dst = *src1 | *src2;
77 else
78 __bitmap_or(dst, src1, src2, nbits);
79}
80
81/**
82 * test_and_set_bit - Set a bit and return its old value
83 * @nr: Bit to set
84 * @addr: Address to count from
85 */
86static inline int test_and_set_bit(int nr, unsigned long *addr)
87{
88 unsigned long mask = BIT_MASK(nr);
89 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
90 unsigned long old;
91
92 old = *p;
93 *p = old | mask;
94
95 return (old & mask) != 0;
96}
97
98/**
99 * bitmap_alloc - Allocate bitmap
100 * @nr: Bit to set
101 */
102static inline unsigned long *bitmap_alloc(int nbits)
103{
104 return calloc(1, BITS_TO_LONGS(nbits) * sizeof(unsigned long));
105}
106
107/*
108 * bitmap_scnprintf - print bitmap list into buffer
109 * @bitmap: bitmap
110 * @nbits: size of bitmap
111 * @buf: buffer to store output
112 * @size: size of @buf
113 */
114size_t bitmap_scnprintf(unsigned long *bitmap, int nbits,
115 char *buf, size_t size);
116
117/**
118 * bitmap_and - Do logical and on bitmaps
119 * @dst: resulting bitmap
120 * @src1: operand 1
121 * @src2: operand 2
122 * @nbits: size of bitmap
123 */
124static inline int bitmap_and(unsigned long *dst, const unsigned long *src1,
125 const unsigned long *src2, unsigned int nbits)
126{
127 if (small_const_nbits(nbits))
128 return (*dst = *src1 & *src2 & BITMAP_LAST_WORD_MASK(nbits)) != 0;
129 return __bitmap_and(dst, src1, src2, nbits);
130}
131
132#endif /* _PERF_BITOPS_H */