1#ifndef _LINUX_BITOPS_H
2#define _LINUX_BITOPS_H
3#include <asm/types.h>
4
5#ifdef	__KERNEL__
6#define BIT(nr)			(1UL << (nr))
7#define BIT_MASK(nr)		(1UL << ((nr) % BITS_PER_LONG))
8#define BIT_WORD(nr)		((nr) / BITS_PER_LONG)
9#define BITS_PER_BYTE		8
10#define BITS_TO_LONGS(nr)	DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
11#endif
12
13extern unsigned int __sw_hweight8(unsigned int w);
14extern unsigned int __sw_hweight16(unsigned int w);
15extern unsigned int __sw_hweight32(unsigned int w);
16extern unsigned long __sw_hweight64(__u64 w);
17
18/*
19 * Include this here because some architectures need generic_ffs/fls in
20 * scope
21 */
22#include <asm/bitops.h>
23
24#define for_each_set_bit(bit, addr, size) \
25	for ((bit) = find_first_bit((addr), (size));		\
26	     (bit) < (size);					\
27	     (bit) = find_next_bit((addr), (size), (bit) + 1))
28
29/* same as for_each_set_bit() but use bit as value to start with */
30#define for_each_set_bit_from(bit, addr, size) \
31	for ((bit) = find_next_bit((addr), (size), (bit));	\
32	     (bit) < (size);					\
33	     (bit) = find_next_bit((addr), (size), (bit) + 1))
34
35#define for_each_clear_bit(bit, addr, size) \
36	for ((bit) = find_first_zero_bit((addr), (size));	\
37	     (bit) < (size);					\
38	     (bit) = find_next_zero_bit((addr), (size), (bit) + 1))
39
40/* same as for_each_clear_bit() but use bit as value to start with */
41#define for_each_clear_bit_from(bit, addr, size) \
42	for ((bit) = find_next_zero_bit((addr), (size), (bit));	\
43	     (bit) < (size);					\
44	     (bit) = find_next_zero_bit((addr), (size), (bit) + 1))
45
46static __inline__ int get_bitmask_order(unsigned int count)
47{
48	int order;
49
50	order = fls(count);
51	return order;	/* We could be slightly more clever with -1 here... */
52}
53
54static __inline__ int get_count_order(unsigned int count)
55{
56	int order;
57
58	order = fls(count) - 1;
59	if (count & (count - 1))
60		order++;
61	return order;
62}
63
64static inline unsigned long hweight_long(unsigned long w)
65{
66	return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
67}
68
69/**
70 * rol64 - rotate a 64-bit value left
71 * @word: value to rotate
72 * @shift: bits to roll
73 */
74static inline __u64 rol64(__u64 word, unsigned int shift)
75{
76	return (word << shift) | (word >> (64 - shift));
77}
78
79/**
80 * ror64 - rotate a 64-bit value right
81 * @word: value to rotate
82 * @shift: bits to roll
83 */
84static inline __u64 ror64(__u64 word, unsigned int shift)
85{
86	return (word >> shift) | (word << (64 - shift));
87}
88
89/**
90 * rol32 - rotate a 32-bit value left
91 * @word: value to rotate
92 * @shift: bits to roll
93 */
94static inline __u32 rol32(__u32 word, unsigned int shift)
95{
96	return (word << shift) | (word >> (32 - shift));
97}
98
99/**
100 * ror32 - rotate a 32-bit value right
101 * @word: value to rotate
102 * @shift: bits to roll
103 */
104static inline __u32 ror32(__u32 word, unsigned int shift)
105{
106	return (word >> shift) | (word << (32 - shift));
107}
108
109/**
110 * rol16 - rotate a 16-bit value left
111 * @word: value to rotate
112 * @shift: bits to roll
113 */
114static inline __u16 rol16(__u16 word, unsigned int shift)
115{
116	return (word << shift) | (word >> (16 - shift));
117}
118
119/**
120 * ror16 - rotate a 16-bit value right
121 * @word: value to rotate
122 * @shift: bits to roll
123 */
124static inline __u16 ror16(__u16 word, unsigned int shift)
125{
126	return (word >> shift) | (word << (16 - shift));
127}
128
129/**
130 * rol8 - rotate an 8-bit value left
131 * @word: value to rotate
132 * @shift: bits to roll
133 */
134static inline __u8 rol8(__u8 word, unsigned int shift)
135{
136	return (word << shift) | (word >> (8 - shift));
137}
138
139/**
140 * ror8 - rotate an 8-bit value right
141 * @word: value to rotate
142 * @shift: bits to roll
143 */
144static inline __u8 ror8(__u8 word, unsigned int shift)
145{
146	return (word >> shift) | (word << (8 - shift));
147}
148
149/**
150 * sign_extend32 - sign extend a 32-bit value using specified bit as sign-bit
151 * @value: value to sign extend
152 * @index: 0 based bit index (0<=index<32) to sign bit
153 */
154static inline __s32 sign_extend32(__u32 value, int index)
155{
156	__u8 shift = 31 - index;
157	return (__s32)(value << shift) >> shift;
158}
159
160static inline unsigned fls_long(unsigned long l)
161{
162	if (sizeof(l) == 4)
163		return fls(l);
164	return fls64(l);
165}
166
167/**
168 * __ffs64 - find first set bit in a 64 bit word
169 * @word: The 64 bit word
170 *
171 * On 64 bit arches this is a synomyn for __ffs
172 * The result is not defined if no bits are set, so check that @word
173 * is non-zero before calling this.
174 */
175static inline unsigned long __ffs64(u64 word)
176{
177#if BITS_PER_LONG == 32
178	if (((u32)word) == 0UL)
179		return __ffs((u32)(word >> 32)) + 32;
180#elif BITS_PER_LONG != 64
181#error BITS_PER_LONG not 32 or 64
182#endif
183	return __ffs((unsigned long)word);
184}
185
186#ifdef __KERNEL__
187
188#ifndef find_last_bit
189/**
190 * find_last_bit - find the last set bit in a memory region
191 * @addr: The address to start the search at
192 * @size: The maximum size to search
193 *
194 * Returns the bit number of the first set bit, or size.
195 */
196extern unsigned long find_last_bit(const unsigned long *addr,
197				   unsigned long size);
198#endif
199
200#endif /* __KERNEL__ */
201#endif
202