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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / b8a9bebeecbf915f2fecab0cfa90899abd872512 / . / arch / sh / include / asm / bitops.h
blob: 8cb8385d76db5e7514f19c75f0d9bbfe6d479016 [file] [log] [blame]
Nobuhiro Iwamatsub02bad12007-09-23 02:12:30 +0900[diff] [blame]1#ifndef __ASM_SH_BITOPS_H
2#define __ASM_SH_BITOPS_H
Nobuhiro Iwamatsu0b135cf2007-05-13 20:58:00 +0900[diff] [blame]3
Fabio Estevamf86411b2015-11-05 12:43:28 -0200[diff] [blame]4#include <asm-generic/bitops/fls.h>
5#include <asm-generic/bitops/__fls.h>
6#include <asm-generic/bitops/fls64.h>
7#include <asm-generic/bitops/__ffs.h>
8
Nobuhiro Iwamatsub02bad12007-09-23 02:12:30 +0900[diff] [blame]9#ifdef __KERNEL__
Nobuhiro Iwamatsub02bad12007-09-23 02:12:30 +0900[diff] [blame]10#include <asm/irqflags.h>
11/* For __swab32 */
12#include <asm/byteorder.h>
Nobuhiro Iwamatsu0b135cf2007-05-13 20:58:00 +0900[diff] [blame]13
Nobuhiro Iwamatsub02bad12007-09-23 02:12:30 +0900[diff] [blame]14static inline void set_bit(int nr, volatile void * addr)
15{
16 int mask;
17 volatile unsigned int *a = addr;
18 unsigned long flags;
19
20 a += nr >> 5;
21 mask = 1 << (nr & 0x1f);
22 local_irq_save(flags);
23 *a |= mask;
24 local_irq_restore(flags);
25}
26
27/*
28 * clear_bit() doesn't provide any barrier for the compiler.
29 */
30#define smp_mb__before_clear_bit() barrier()
31#define smp_mb__after_clear_bit() barrier()
32static inline void clear_bit(int nr, volatile void * addr)
33{
34 int mask;
35 volatile unsigned int *a = addr;
36 unsigned long flags;
37
38 a += nr >> 5;
39 mask = 1 << (nr & 0x1f);
40 local_irq_save(flags);
41 *a &= ~mask;
42 local_irq_restore(flags);
43}
44
45static inline void change_bit(int nr, volatile void * addr)
46{
47 int mask;
48 volatile unsigned int *a = addr;
49 unsigned long flags;
50
51 a += nr >> 5;
52 mask = 1 << (nr & 0x1f);
53 local_irq_save(flags);
54 *a ^= mask;
55 local_irq_restore(flags);
56}
57
58static inline int test_and_set_bit(int nr, volatile void * addr)
59{
60 int mask, retval;
61 volatile unsigned int *a = addr;
62 unsigned long flags;
63
64 a += nr >> 5;
65 mask = 1 << (nr & 0x1f);
66 local_irq_save(flags);
67 retval = (mask & *a) != 0;
68 *a |= mask;
69 local_irq_restore(flags);
70
71 return retval;
72}
73
74static inline int test_and_clear_bit(int nr, volatile void * addr)
75{
76 int mask, retval;
77 volatile unsigned int *a = addr;
78 unsigned long flags;
79
80 a += nr >> 5;
81 mask = 1 << (nr & 0x1f);
82 local_irq_save(flags);
83 retval = (mask & *a) != 0;
84 *a &= ~mask;
85 local_irq_restore(flags);
86
87 return retval;
88}
89
90static inline int test_and_change_bit(int nr, volatile void * addr)
91{
92 int mask, retval;
93 volatile unsigned int *a = addr;
94 unsigned long flags;
95
96 a += nr >> 5;
97 mask = 1 << (nr & 0x1f);
98 local_irq_save(flags);
99 retval = (mask & *a) != 0;
100 *a ^= mask;
101 local_irq_restore(flags);
102
103 return retval;
104}
105
Nobuhiro Iwamatsub02bad12007-09-23 02:12:30 +0900[diff] [blame]106static inline unsigned long ffz(unsigned long word)
107{
108 unsigned long result;
109
110 __asm__("1:\n\t"
111 "shlr %1\n\t"
112 "bt/s 1b\n\t"
113 " add #1, %0"
114 : "=r" (result), "=r" (word)
115 : "0" (~0L), "1" (word)
116 : "t");
117 return result;
118}
119
120/**
121 * ffs - find first bit in word.
122 * @word: The word to search
123 *
124 * Undefined if no bit exists, so code should check against 0 first.
125 */
Wolfgang Denk61fb15c52007-12-27 01:52:50 +0100[diff] [blame]126static inline int ffs (int x)
Nobuhiro Iwamatsub02bad12007-09-23 02:12:30 +0900[diff] [blame]127{
Wolfgang Denk61fb15c52007-12-27 01:52:50 +0100[diff] [blame]128 int r = 1;
Nobuhiro Iwamatsub02bad12007-09-23 02:12:30 +0900[diff] [blame]129
Wolfgang Denk61fb15c52007-12-27 01:52:50 +0100[diff] [blame]130 if (!x)
131 return 0;
132 if (!(x & 0xffff)) {
133 x >>= 16;
134 r += 16;
135 }
136 if (!(x & 0xff)) {
137 x >>= 8;
138 r += 8;
139 }
140 if (!(x & 0xf)) {
141 x >>= 4;
142 r += 4;
143 }
144 if (!(x & 3)) {
145 x >>= 2;
146 r += 2;
147 }
148 if (!(x & 1)) {
149 x >>= 1;
150 r += 1;
151 }
152 return r;
Nobuhiro Iwamatsub02bad12007-09-23 02:12:30 +0900[diff] [blame]153}
Simon Kagstrom0413cfe2009-09-17 15:15:52 +0200[diff] [blame]154#define PLATFORM_FFS
Simon Kagstrom52d61222009-08-24 09:10:12 +0200[diff] [blame]155
Nobuhiro Iwamatsub02bad12007-09-23 02:12:30 +0900[diff] [blame]156#endif /* __KERNEL__ */
157
158#endif /* __ASM_SH_BITOPS_H */