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15#ifndef __ASM_ARM_BITOPS_H
16#define __ASM_ARM_BITOPS_H
17
18#include <asm-generic/bitops/__ffs.h>
19#include <asm-generic/bitops/__fls.h>
20#include <asm-generic/bitops/fls.h>
21#include <asm-generic/bitops/fls64.h>
22
23#ifdef __KERNEL__
24
25#ifndef __ASSEMBLY__
26#include <linux/bitops.h>
27#endif
28#include <asm/proc-armv/system.h>
29
30#define smp_mb__before_clear_bit() do { } while (0)
31#define smp_mb__after_clear_bit() do { } while (0)
32
33
34
35
36extern void set_bit(int nr, volatile void * addr);
37
38extern void clear_bit(int nr, volatile void * addr);
39
40extern void change_bit(int nr, volatile void * addr);
41
42static inline void __change_bit(int nr, volatile void *addr)
43{
44 unsigned long mask = BIT_MASK(nr);
45 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
46
47 *p ^= mask;
48}
49
50static inline int __test_and_set_bit(int nr, volatile void *addr)
51{
52 unsigned long mask = BIT_MASK(nr);
53 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
54 unsigned long old = *p;
55
56 *p = old | mask;
57 return (old & mask) != 0;
58}
59
60static inline int test_and_set_bit(int nr, volatile void * addr)
61{
62 unsigned long flags = 0;
63 int out;
64
65 local_irq_save(flags);
66 out = __test_and_set_bit(nr, addr);
67 local_irq_restore(flags);
68
69 return out;
70}
71
72static inline int __test_and_clear_bit(int nr, volatile void *addr)
73{
74 unsigned long mask = BIT_MASK(nr);
75 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
76 unsigned long old = *p;
77
78 *p = old & ~mask;
79 return (old & mask) != 0;
80}
81
82static inline int test_and_clear_bit(int nr, volatile void * addr)
83{
84 unsigned long flags = 0;
85 int out;
86
87 local_irq_save(flags);
88 out = __test_and_clear_bit(nr, addr);
89 local_irq_restore(flags);
90
91 return out;
92}
93
94extern int test_and_change_bit(int nr, volatile void * addr);
95
96static inline int __test_and_change_bit(int nr, volatile void *addr)
97{
98 unsigned long mask = BIT_MASK(nr);
99 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
100 unsigned long old = *p;
101
102 *p = old ^ mask;
103 return (old & mask) != 0;
104}
105
106
107
108
109static inline int test_bit(int nr, const void * addr)
110{
111 return ((unsigned char *) addr)[nr >> 3] & (1U << (nr & 7));
112}
113
114static inline int __ilog2(unsigned int x)
115{
116 return generic_fls(x) - 1;
117}
118
119#define ffz(x) __ffs(~(x))
120
121static inline int find_next_zero_bit(void *addr, int size, int offset)
122{
123 unsigned long *p = ((unsigned long *)addr) + (offset / BITS_PER_LONG);
124 unsigned long result = offset & ~(BITS_PER_LONG - 1);
125 unsigned long tmp;
126
127 if (offset >= size)
128 return size;
129 size -= result;
130 offset &= (BITS_PER_LONG - 1);
131 if (offset) {
132 tmp = *(p++);
133 tmp |= ~0UL >> (BITS_PER_LONG - offset);
134 if (size < BITS_PER_LONG)
135 goto found_first;
136 if (~tmp)
137 goto found_middle;
138 size -= BITS_PER_LONG;
139 result += BITS_PER_LONG;
140 }
141 while (size & ~(BITS_PER_LONG - 1)) {
142 tmp = *(p++);
143 if (~tmp)
144 goto found_middle;
145 result += BITS_PER_LONG;
146 size -= BITS_PER_LONG;
147 }
148 if (!size)
149 return result;
150 tmp = *p;
151
152found_first:
153 tmp |= ~0UL << size;
154found_middle:
155 return result + ffz(tmp);
156}
157
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161
162
163#define hweight32(x) generic_hweight32(x)
164#define hweight16(x) generic_hweight16(x)
165#define hweight8(x) generic_hweight8(x)
166
167#define find_first_zero_bit(addr, size) \
168 find_next_zero_bit((addr), (size), 0)
169
170#define ext2_set_bit test_and_set_bit
171#define ext2_clear_bit test_and_clear_bit
172#define ext2_test_bit test_bit
173#define ext2_find_first_zero_bit find_first_zero_bit
174#define ext2_find_next_zero_bit find_next_zero_bit
175
176
177#define minix_test_and_set_bit(nr,addr) test_and_set_bit(nr,addr)
178#define minix_set_bit(nr,addr) set_bit(nr,addr)
179#define minix_test_and_clear_bit(nr,addr) test_and_clear_bit(nr,addr)
180#define minix_test_bit(nr,addr) test_bit(nr,addr)
181#define minix_find_first_zero_bit(addr,size) find_first_zero_bit(addr,size)
182
183#endif
184
185#endif
186