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
11 int __bitmap_weight(const unsigned long *bitmap, int bits);
12 void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
13 const unsigned long *bitmap2, int bits);
14 int __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
bitmap_zero(unsigned long * dst,int nbits)28 static 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
bitmap_weight(const unsigned long * src,int nbits)38 static 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
bitmap_or(unsigned long * dst,const unsigned long * src1,const unsigned long * src2,int nbits)45 static 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 */
test_and_set_bit(int nr,unsigned long * addr)59 static 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 */
bitmap_alloc(int nbits)75 static 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 */
87 size_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 */
bitmap_and(unsigned long * dst,const unsigned long * src1,const unsigned long * src2,unsigned int nbits)97 static 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 */
106