Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _PERF_BITOPS_H
3#define _PERF_BITOPS_H
4
5#include <string.h>
6#include <linux/bitops.h>
7#include <stdlib.h>
8#include <linux/kernel.h>
9
10#define DECLARE_BITMAP(name,bits) \
11 unsigned long name[BITS_TO_LONGS(bits)]
12
13int __bitmap_weight(const unsigned long *bitmap, int bits);
14void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
15 const unsigned long *bitmap2, int bits);
16int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1,
17 const unsigned long *bitmap2, unsigned int bits);
18int __bitmap_equal(const unsigned long *bitmap1,
19 const unsigned long *bitmap2, unsigned int bits);
20void bitmap_clear(unsigned long *map, unsigned int start, int len);
21
22#define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1)))
23#define BITMAP_LAST_WORD_MASK(nbits) (~0UL >> (-(nbits) & (BITS_PER_LONG - 1)))
24
25static inline void bitmap_zero(unsigned long *dst, unsigned int nbits)
26{
27 if (small_const_nbits(nbits))
28 *dst = 0UL;
29 else {
30 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
31 memset(dst, 0, len);
32 }
33}
34
35static inline void bitmap_fill(unsigned long *dst, unsigned int nbits)
36{
37 unsigned int nlongs = BITS_TO_LONGS(nbits);
38 if (!small_const_nbits(nbits)) {
39 unsigned int len = (nlongs - 1) * sizeof(unsigned long);
40 memset(dst, 0xff, len);
41 }
42 dst[nlongs - 1] = BITMAP_LAST_WORD_MASK(nbits);
43}
44
45static inline int bitmap_empty(const unsigned long *src, unsigned nbits)
46{
47 if (small_const_nbits(nbits))
48 return ! (*src & BITMAP_LAST_WORD_MASK(nbits));
49
50 return find_first_bit(src, nbits) == nbits;
51}
52
53static inline int bitmap_full(const unsigned long *src, unsigned int nbits)
54{
55 if (small_const_nbits(nbits))
56 return ! (~(*src) & BITMAP_LAST_WORD_MASK(nbits));
57
58 return find_first_zero_bit(src, nbits) == nbits;
59}
60
61static inline int bitmap_weight(const unsigned long *src, unsigned int nbits)
62{
63 if (small_const_nbits(nbits))
64 return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
65 return __bitmap_weight(src, nbits);
66}
67
68static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,
69 const unsigned long *src2, unsigned int nbits)
70{
71 if (small_const_nbits(nbits))
72 *dst = *src1 | *src2;
73 else
74 __bitmap_or(dst, src1, src2, nbits);
75}
76
77/**
78 * test_and_set_bit - Set a bit and return its old value
79 * @nr: Bit to set
80 * @addr: Address to count from
81 */
82static inline int test_and_set_bit(int nr, unsigned long *addr)
83{
84 unsigned long mask = BIT_MASK(nr);
85 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
86 unsigned long old;
87
88 old = *p;
89 *p = old | mask;
90
91 return (old & mask) != 0;
92}
93
94/**
95 * test_and_clear_bit - Clear a bit and return its old value
96 * @nr: Bit to clear
97 * @addr: Address to count from
98 */
99static inline int test_and_clear_bit(int nr, unsigned long *addr)
100{
101 unsigned long mask = BIT_MASK(nr);
102 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
103 unsigned long old;
104
105 old = *p;
106 *p = old & ~mask;
107
108 return (old & mask) != 0;
109}
110
111/**
112 * bitmap_alloc - Allocate bitmap
113 * @nbits: Number of bits
114 */
115static inline unsigned long *bitmap_alloc(int nbits)
116{
117 return calloc(1, BITS_TO_LONGS(nbits) * sizeof(unsigned long));
118}
119
120/*
121 * bitmap_free - Free bitmap
122 * @bitmap: pointer to bitmap
123 */
124static inline void bitmap_free(unsigned long *bitmap)
125{
126 free(bitmap);
127}
128
129/*
130 * bitmap_scnprintf - print bitmap list into buffer
131 * @bitmap: bitmap
132 * @nbits: size of bitmap
133 * @buf: buffer to store output
134 * @size: size of @buf
135 */
136size_t bitmap_scnprintf(unsigned long *bitmap, unsigned int nbits,
137 char *buf, size_t size);
138
139/**
140 * bitmap_and - Do logical and on bitmaps
141 * @dst: resulting bitmap
142 * @src1: operand 1
143 * @src2: operand 2
144 * @nbits: size of bitmap
145 */
146static inline int bitmap_and(unsigned long *dst, const unsigned long *src1,
147 const unsigned long *src2, unsigned int nbits)
148{
149 if (small_const_nbits(nbits))
150 return (*dst = *src1 & *src2 & BITMAP_LAST_WORD_MASK(nbits)) != 0;
151 return __bitmap_and(dst, src1, src2, nbits);
152}
153
154#ifdef __LITTLE_ENDIAN
155#define BITMAP_MEM_ALIGNMENT 8
156#else
157#define BITMAP_MEM_ALIGNMENT (8 * sizeof(unsigned long))
158#endif
159#define BITMAP_MEM_MASK (BITMAP_MEM_ALIGNMENT - 1)
160#define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
161
162static inline int bitmap_equal(const unsigned long *src1,
163 const unsigned long *src2, unsigned int nbits)
164{
165 if (small_const_nbits(nbits))
166 return !((*src1 ^ *src2) & BITMAP_LAST_WORD_MASK(nbits));
167 if (__builtin_constant_p(nbits & BITMAP_MEM_MASK) &&
168 IS_ALIGNED(nbits, BITMAP_MEM_ALIGNMENT))
169 return !memcmp(src1, src2, nbits / 8);
170 return __bitmap_equal(src1, src2, nbits);
171}
172
173#endif /* _PERF_BITOPS_H */