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_ULL(nr)		(1ULL << (nr))
8#define BIT_MASK(nr)		(1UL << ((nr) % BITS_PER_LONG))
9#define BIT_WORD(nr)		((nr) / BITS_PER_LONG)
10#define BIT_ULL_MASK(nr)	(1ULL << ((nr) % BITS_PER_LONG_LONG))
11#define BIT_ULL_WORD(nr)	((nr) / BITS_PER_LONG_LONG)
12#define BITS_PER_BYTE		8
13#define BITS_TO_LONGS(nr)	DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
14#endif
15
16/*
17 * Create a contiguous bitmask starting at bit position @l and ending at
18 * position @h. For example
19 * GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000.
20 */
21#define GENMASK(h, l) \
22	(((~0UL) << (l)) & (~0UL >> (BITS_PER_LONG - 1 - (h))))
23
24#define GENMASK_ULL(h, l) \
25	(((~0ULL) << (l)) & (~0ULL >> (BITS_PER_LONG_LONG - 1 - (h))))
26
27extern unsigned int __sw_hweight8(unsigned int w);
28extern unsigned int __sw_hweight16(unsigned int w);
29extern unsigned int __sw_hweight32(unsigned int w);
30extern unsigned long __sw_hweight64(__u64 w);
31
32/*
33 * Include this here because some architectures need generic_ffs/fls in
34 * scope
35 */
36#include <asm/bitops.h>
37
38#define for_each_set_bit(bit, addr, size) \
39	for ((bit) = find_first_bit((addr), (size));		\
40	     (bit) < (size);					\
41	     (bit) = find_next_bit((addr), (size), (bit) + 1))
42
43/* same as for_each_set_bit() but use bit as value to start with */
44#define for_each_set_bit_from(bit, addr, size) \
45	for ((bit) = find_next_bit((addr), (size), (bit));	\
46	     (bit) < (size);					\
47	     (bit) = find_next_bit((addr), (size), (bit) + 1))
48
49#define for_each_clear_bit(bit, addr, size) \
50	for ((bit) = find_first_zero_bit((addr), (size));	\
51	     (bit) < (size);					\
52	     (bit) = find_next_zero_bit((addr), (size), (bit) + 1))
53
54/* same as for_each_clear_bit() but use bit as value to start with */
55#define for_each_clear_bit_from(bit, addr, size) \
56	for ((bit) = find_next_zero_bit((addr), (size), (bit));	\
57	     (bit) < (size);					\
58	     (bit) = find_next_zero_bit((addr), (size), (bit) + 1))
59
60static __inline__ int get_bitmask_order(unsigned int count)
61{
62	int order;
63
64	order = fls(count);
65	return order;	/* We could be slightly more clever with -1 here... */
66}
67
68static __inline__ int get_count_order(unsigned int count)
69{
70	int order;
71
72	order = fls(count) - 1;
73	if (count & (count - 1))
74		order++;
75	return order;
76}
77
78static inline unsigned long hweight_long(unsigned long w)
79{
80	return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
81}
82
83/**
84 * rol64 - rotate a 64-bit value left
85 * @word: value to rotate
86 * @shift: bits to roll
87 */
88static inline __u64 rol64(__u64 word, unsigned int shift)
89{
90	return (word << shift) | (word >> (64 - shift));
91}
92
93/**
94 * ror64 - rotate a 64-bit value right
95 * @word: value to rotate
96 * @shift: bits to roll
97 */
98static inline __u64 ror64(__u64 word, unsigned int shift)
99{
100	return (word >> shift) | (word << (64 - shift));
101}
102
103/**
104 * rol32 - rotate a 32-bit value left
105 * @word: value to rotate
106 * @shift: bits to roll
107 */
108static inline __u32 rol32(__u32 word, unsigned int shift)
109{
110	return (word << shift) | (word >> (32 - shift));
111}
112
113/**
114 * ror32 - rotate a 32-bit value right
115 * @word: value to rotate
116 * @shift: bits to roll
117 */
118static inline __u32 ror32(__u32 word, unsigned int shift)
119{
120	return (word >> shift) | (word << (32 - shift));
121}
122
123/**
124 * rol16 - rotate a 16-bit value left
125 * @word: value to rotate
126 * @shift: bits to roll
127 */
128static inline __u16 rol16(__u16 word, unsigned int shift)
129{
130	return (word << shift) | (word >> (16 - shift));
131}
132
133/**
134 * ror16 - rotate a 16-bit value right
135 * @word: value to rotate
136 * @shift: bits to roll
137 */
138static inline __u16 ror16(__u16 word, unsigned int shift)
139{
140	return (word >> shift) | (word << (16 - shift));
141}
142
143/**
144 * rol8 - rotate an 8-bit value left
145 * @word: value to rotate
146 * @shift: bits to roll
147 */
148static inline __u8 rol8(__u8 word, unsigned int shift)
149{
150	return (word << shift) | (word >> (8 - shift));
151}
152
153/**
154 * ror8 - rotate an 8-bit value right
155 * @word: value to rotate
156 * @shift: bits to roll
157 */
158static inline __u8 ror8(__u8 word, unsigned int shift)
159{
160	return (word >> shift) | (word << (8 - shift));
161}
162
163/**
164 * sign_extend32 - sign extend a 32-bit value using specified bit as sign-bit
165 * @value: value to sign extend
166 * @index: 0 based bit index (0<=index<32) to sign bit
167 */
168static inline __s32 sign_extend32(__u32 value, int index)
169{
170	__u8 shift = 31 - index;
171	return (__s32)(value << shift) >> shift;
172}
173
174static inline unsigned fls_long(unsigned long l)
175{
176	if (sizeof(l) == 4)
177		return fls(l);
178	return fls64(l);
179}
180
181/**
182 * __ffs64 - find first set bit in a 64 bit word
183 * @word: The 64 bit word
184 *
185 * On 64 bit arches this is a synomyn for __ffs
186 * The result is not defined if no bits are set, so check that @word
187 * is non-zero before calling this.
188 */
189static inline unsigned long __ffs64(u64 word)
190{
191#if BITS_PER_LONG == 32
192	if (((u32)word) == 0UL)
193		return __ffs((u32)(word >> 32)) + 32;
194#elif BITS_PER_LONG != 64
195#error BITS_PER_LONG not 32 or 64
196#endif
197	return __ffs((unsigned long)word);
198}
199
200#ifdef __KERNEL__
201
202#ifndef set_mask_bits
203#define set_mask_bits(ptr, _mask, _bits)	\
204({								\
205	const typeof(*ptr) mask = (_mask), bits = (_bits);	\
206	typeof(*ptr) old, new;					\
207								\
208	do {							\
209		old = ACCESS_ONCE(*ptr);			\
210		new = (old & ~mask) | bits;			\
211	} while (cmpxchg(ptr, old, new) != old);		\
212								\
213	new;							\
214})
215#endif
216
217#ifndef find_last_bit
218/**
219 * find_last_bit - find the last set bit in a memory region
220 * @addr: The address to start the search at
221 * @size: The number of bits to search
222 *
223 * Returns the bit number of the last set bit, or size.
224 */
225extern unsigned long find_last_bit(const unsigned long *addr,
226				   unsigned long size);
227#endif
228
229#endif /* __KERNEL__ */
230#endif
231