Linux kernel mirror (for testing)
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linux
1/*
2 * Copyright 2004-2009 Analog Devices Inc.
3 *
4 * Licensed under the GPL-2 or later.
5 */
6
7#ifndef _BLACKFIN_BITOPS_H
8#define _BLACKFIN_BITOPS_H
9
10#include <linux/compiler.h>
11
12#include <asm-generic/bitops/__ffs.h>
13#include <asm-generic/bitops/ffz.h>
14#include <asm-generic/bitops/fls.h>
15#include <asm-generic/bitops/__fls.h>
16#include <asm-generic/bitops/fls64.h>
17#include <asm-generic/bitops/find.h>
18
19#ifndef _LINUX_BITOPS_H
20#error only <linux/bitops.h> can be included directly
21#endif
22
23#include <asm-generic/bitops/sched.h>
24#include <asm-generic/bitops/ffs.h>
25#include <asm-generic/bitops/const_hweight.h>
26#include <asm-generic/bitops/lock.h>
27
28#include <asm-generic/bitops/ext2-atomic.h>
29
30#ifndef CONFIG_SMP
31#include <linux/irqflags.h>
32
33/*
34 * clear_bit may not imply a memory barrier
35 */
36#ifndef smp_mb__before_clear_bit
37#define smp_mb__before_clear_bit() smp_mb()
38#define smp_mb__after_clear_bit() smp_mb()
39#endif
40#include <asm-generic/bitops/atomic.h>
41#include <asm-generic/bitops/non-atomic.h>
42#else
43
44#include <asm/barrier.h>
45#include <asm/byteorder.h> /* swab32 */
46#include <linux/linkage.h>
47
48asmlinkage int __raw_bit_set_asm(volatile unsigned long *addr, int nr);
49
50asmlinkage int __raw_bit_clear_asm(volatile unsigned long *addr, int nr);
51
52asmlinkage int __raw_bit_toggle_asm(volatile unsigned long *addr, int nr);
53
54asmlinkage int __raw_bit_test_set_asm(volatile unsigned long *addr, int nr);
55
56asmlinkage int __raw_bit_test_clear_asm(volatile unsigned long *addr, int nr);
57
58asmlinkage int __raw_bit_test_toggle_asm(volatile unsigned long *addr, int nr);
59
60asmlinkage int __raw_bit_test_asm(const volatile unsigned long *addr, int nr);
61
62static inline void set_bit(int nr, volatile unsigned long *addr)
63{
64 volatile unsigned long *a = addr + (nr >> 5);
65 __raw_bit_set_asm(a, nr & 0x1f);
66}
67
68static inline void clear_bit(int nr, volatile unsigned long *addr)
69{
70 volatile unsigned long *a = addr + (nr >> 5);
71 __raw_bit_clear_asm(a, nr & 0x1f);
72}
73
74static inline void change_bit(int nr, volatile unsigned long *addr)
75{
76 volatile unsigned long *a = addr + (nr >> 5);
77 __raw_bit_toggle_asm(a, nr & 0x1f);
78}
79
80static inline int test_bit(int nr, const volatile unsigned long *addr)
81{
82 volatile const unsigned long *a = addr + (nr >> 5);
83 return __raw_bit_test_asm(a, nr & 0x1f) != 0;
84}
85
86static inline int test_and_set_bit(int nr, volatile unsigned long *addr)
87{
88 volatile unsigned long *a = addr + (nr >> 5);
89 return __raw_bit_test_set_asm(a, nr & 0x1f);
90}
91
92static inline int test_and_clear_bit(int nr, volatile unsigned long *addr)
93{
94 volatile unsigned long *a = addr + (nr >> 5);
95 return __raw_bit_test_clear_asm(a, nr & 0x1f);
96}
97
98static inline int test_and_change_bit(int nr, volatile unsigned long *addr)
99{
100 volatile unsigned long *a = addr + (nr >> 5);
101 return __raw_bit_test_toggle_asm(a, nr & 0x1f);
102}
103
104/*
105 * clear_bit() doesn't provide any barrier for the compiler.
106 */
107#define smp_mb__before_clear_bit() barrier()
108#define smp_mb__after_clear_bit() barrier()
109
110#define test_bit __skip_test_bit
111#include <asm-generic/bitops/non-atomic.h>
112#undef test_bit
113
114#endif /* CONFIG_SMP */
115
116/* Needs to be after test_bit and friends */
117#include <asm-generic/bitops/le.h>
118
119/*
120 * hweightN: returns the hamming weight (i.e. the number
121 * of bits set) of a N-bit word
122 */
123
124static inline unsigned int __arch_hweight32(unsigned int w)
125{
126 unsigned int res;
127
128 __asm__ ("%0.l = ONES %1;"
129 "%0 = %0.l (Z);"
130 : "=d" (res) : "d" (w));
131 return res;
132}
133
134static inline unsigned int __arch_hweight64(__u64 w)
135{
136 return __arch_hweight32((unsigned int)(w >> 32)) +
137 __arch_hweight32((unsigned int)w);
138}
139
140static inline unsigned int __arch_hweight16(unsigned int w)
141{
142 return __arch_hweight32(w & 0xffff);
143}
144
145static inline unsigned int __arch_hweight8(unsigned int w)
146{
147 return __arch_hweight32(w & 0xff);
148}
149
150#endif /* _BLACKFIN_BITOPS_H */