Linux kernel mirror (for testing)
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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);
21int __bitmap_intersects(const unsigned long *bitmap1,
22 const unsigned long *bitmap2, unsigned int bits);
23
24#define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1)))
25#define BITMAP_LAST_WORD_MASK(nbits) (~0UL >> (-(nbits) & (BITS_PER_LONG - 1)))
26
27static inline void bitmap_zero(unsigned long *dst, unsigned int nbits)
28{
29 if (small_const_nbits(nbits))
30 *dst = 0UL;
31 else {
32 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
33 memset(dst, 0, len);
34 }
35}
36
37static inline void bitmap_fill(unsigned long *dst, unsigned int nbits)
38{
39 unsigned int nlongs = BITS_TO_LONGS(nbits);
40 if (!small_const_nbits(nbits)) {
41 unsigned int len = (nlongs - 1) * sizeof(unsigned long);
42 memset(dst, 0xff, len);
43 }
44 dst[nlongs - 1] = BITMAP_LAST_WORD_MASK(nbits);
45}
46
47static inline int bitmap_empty(const unsigned long *src, unsigned nbits)
48{
49 if (small_const_nbits(nbits))
50 return ! (*src & BITMAP_LAST_WORD_MASK(nbits));
51
52 return find_first_bit(src, nbits) == nbits;
53}
54
55static inline int bitmap_full(const unsigned long *src, unsigned int nbits)
56{
57 if (small_const_nbits(nbits))
58 return ! (~(*src) & BITMAP_LAST_WORD_MASK(nbits));
59
60 return find_first_zero_bit(src, nbits) == nbits;
61}
62
63static inline int bitmap_weight(const unsigned long *src, unsigned int nbits)
64{
65 if (small_const_nbits(nbits))
66 return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
67 return __bitmap_weight(src, nbits);
68}
69
70static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,
71 const unsigned long *src2, unsigned int nbits)
72{
73 if (small_const_nbits(nbits))
74 *dst = *src1 | *src2;
75 else
76 __bitmap_or(dst, src1, src2, nbits);
77}
78
79/**
80 * test_and_set_bit - Set a bit and return its old value
81 * @nr: Bit to set
82 * @addr: Address to count from
83 */
84static inline int test_and_set_bit(int nr, unsigned long *addr)
85{
86 unsigned long mask = BIT_MASK(nr);
87 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
88 unsigned long old;
89
90 old = *p;
91 *p = old | mask;
92
93 return (old & mask) != 0;
94}
95
96/**
97 * test_and_clear_bit - Clear a bit and return its old value
98 * @nr: Bit to clear
99 * @addr: Address to count from
100 */
101static inline int test_and_clear_bit(int nr, unsigned long *addr)
102{
103 unsigned long mask = BIT_MASK(nr);
104 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
105 unsigned long old;
106
107 old = *p;
108 *p = old & ~mask;
109
110 return (old & mask) != 0;
111}
112
113/**
114 * bitmap_alloc - Allocate bitmap
115 * @nbits: Number of bits
116 */
117static inline unsigned long *bitmap_alloc(int nbits)
118{
119 return calloc(1, BITS_TO_LONGS(nbits) * sizeof(unsigned long));
120}
121
122/*
123 * bitmap_free - Free bitmap
124 * @bitmap: pointer to bitmap
125 */
126static inline void bitmap_free(unsigned long *bitmap)
127{
128 free(bitmap);
129}
130
131/*
132 * bitmap_scnprintf - print bitmap list into buffer
133 * @bitmap: bitmap
134 * @nbits: size of bitmap
135 * @buf: buffer to store output
136 * @size: size of @buf
137 */
138size_t bitmap_scnprintf(unsigned long *bitmap, unsigned int nbits,
139 char *buf, size_t size);
140
141/**
142 * bitmap_and - Do logical and on bitmaps
143 * @dst: resulting bitmap
144 * @src1: operand 1
145 * @src2: operand 2
146 * @nbits: size of bitmap
147 */
148static inline int bitmap_and(unsigned long *dst, const unsigned long *src1,
149 const unsigned long *src2, unsigned int nbits)
150{
151 if (small_const_nbits(nbits))
152 return (*dst = *src1 & *src2 & BITMAP_LAST_WORD_MASK(nbits)) != 0;
153 return __bitmap_and(dst, src1, src2, nbits);
154}
155
156#ifdef __LITTLE_ENDIAN
157#define BITMAP_MEM_ALIGNMENT 8
158#else
159#define BITMAP_MEM_ALIGNMENT (8 * sizeof(unsigned long))
160#endif
161#define BITMAP_MEM_MASK (BITMAP_MEM_ALIGNMENT - 1)
162#define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
163
164static inline int bitmap_equal(const unsigned long *src1,
165 const unsigned long *src2, unsigned int nbits)
166{
167 if (small_const_nbits(nbits))
168 return !((*src1 ^ *src2) & BITMAP_LAST_WORD_MASK(nbits));
169 if (__builtin_constant_p(nbits & BITMAP_MEM_MASK) &&
170 IS_ALIGNED(nbits, BITMAP_MEM_ALIGNMENT))
171 return !memcmp(src1, src2, nbits / 8);
172 return __bitmap_equal(src1, src2, nbits);
173}
174
175static inline int bitmap_intersects(const unsigned long *src1,
176 const unsigned long *src2, unsigned int nbits)
177{
178 if (small_const_nbits(nbits))
179 return ((*src1 & *src2) & BITMAP_LAST_WORD_MASK(nbits)) != 0;
180 else
181 return __bitmap_intersects(src1, src2, nbits);
182}
183
184#endif /* _PERF_BITOPS_H */