1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _TOOLS_LINUX_BITOPS_H_
3 #define _TOOLS_LINUX_BITOPS_H_
4 
5 #include <asm/types.h>
6 #include <limits.h>
7 #ifndef __WORDSIZE
8 #define __WORDSIZE (__SIZEOF_LONG__ * 8)
9 #endif
10 
11 #ifndef BITS_PER_LONG
12 # define BITS_PER_LONG __WORDSIZE
13 #endif
14 #include <linux/bits.h>
15 #include <linux/compiler.h>
16 
17 #define BITS_PER_TYPE(type)	(sizeof(type) * BITS_PER_BYTE)
18 #define BITS_TO_LONGS(nr)	DIV_ROUND_UP(nr, BITS_PER_TYPE(long))
19 #define BITS_TO_U64(nr)		DIV_ROUND_UP(nr, BITS_PER_TYPE(u64))
20 #define BITS_TO_U32(nr)		DIV_ROUND_UP(nr, BITS_PER_TYPE(u32))
21 #define BITS_TO_BYTES(nr)	DIV_ROUND_UP(nr, BITS_PER_TYPE(char))
22 
23 extern unsigned int __sw_hweight8(unsigned int w);
24 extern unsigned int __sw_hweight16(unsigned int w);
25 extern unsigned int __sw_hweight32(unsigned int w);
26 extern unsigned long __sw_hweight64(__u64 w);
27 
28 /*
29  * Defined here because those may be needed by architecture-specific static
30  * inlines.
31  */
32 
33 #define bitop(op, nr, addr)						\
34 	op(nr, addr)
35 
36 #define __set_bit(nr, addr)		bitop(___set_bit, nr, addr)
37 #define __clear_bit(nr, addr)		bitop(___clear_bit, nr, addr)
38 #define __change_bit(nr, addr)		bitop(___change_bit, nr, addr)
39 #define __test_and_set_bit(nr, addr)	bitop(___test_and_set_bit, nr, addr)
40 #define __test_and_clear_bit(nr, addr)	bitop(___test_and_clear_bit, nr, addr)
41 #define __test_and_change_bit(nr, addr)	bitop(___test_and_change_bit, nr, addr)
42 #define test_bit(nr, addr)		bitop(_test_bit, nr, addr)
43 
44 /*
45  * Include this here because some architectures need generic_ffs/fls in
46  * scope
47  *
48  * XXX: this needs to be asm/bitops.h, when we get to per arch optimizations
49  */
50 #include <asm-generic/bitops.h>
51 
52 #define for_each_set_bit(bit, addr, size) \
53 	for ((bit) = find_first_bit((addr), (size));		\
54 	     (bit) < (size);					\
55 	     (bit) = find_next_bit((addr), (size), (bit) + 1))
56 
57 #define for_each_clear_bit(bit, addr, size) \
58 	for ((bit) = find_first_zero_bit((addr), (size));       \
59 	     (bit) < (size);                                    \
60 	     (bit) = find_next_zero_bit((addr), (size), (bit) + 1))
61 
62 /* same as for_each_set_bit() but use bit as value to start with */
63 #define for_each_set_bit_from(bit, addr, size) \
64 	for ((bit) = find_next_bit((addr), (size), (bit));	\
65 	     (bit) < (size);					\
66 	     (bit) = find_next_bit((addr), (size), (bit) + 1))
67 
hweight_long(unsigned long w)68 static inline unsigned long hweight_long(unsigned long w)
69 {
70 	return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
71 }
72 
fls_long(unsigned long l)73 static inline unsigned fls_long(unsigned long l)
74 {
75 	if (sizeof(l) == 4)
76 		return fls(l);
77 	return fls64(l);
78 }
79 
80 /**
81  * rol32 - rotate a 32-bit value left
82  * @word: value to rotate
83  * @shift: bits to roll
84  */
rol32(__u32 word,unsigned int shift)85 static inline __u32 rol32(__u32 word, unsigned int shift)
86 {
87 	return (word << shift) | (word >> ((-shift) & 31));
88 }
89 
90 #endif
91