1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
|
/* MN10300 bit operations
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*
* These have to be done with inline assembly: that way the bit-setting
* is guaranteed to be atomic. All bit operations return 0 if the bit
* was cleared before the operation and != 0 if it was not.
*
* bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1).
*/
#ifndef __ASM_BITOPS_H
#define __ASM_BITOPS_H
#include <asm/cpu-regs.h>
#define smp_mb__before_clear_bit() barrier()
#define smp_mb__after_clear_bit() barrier()
/*
* set bit
*/
#define __set_bit(nr, addr) \
({ \
volatile unsigned char *_a = (unsigned char *)(addr); \
const unsigned shift = (nr) & 7; \
_a += (nr) >> 3; \
\
asm volatile("bset %2,(%1) # set_bit reg" \
: "=m"(*_a) \
: "a"(_a), "d"(1 << shift), "m"(*_a) \
: "memory", "cc"); \
})
#define set_bit(nr, addr) __set_bit((nr), (addr))
/*
* clear bit
*/
#define ___clear_bit(nr, addr) \
({ \
volatile unsigned char *_a = (unsigned char *)(addr); \
const unsigned shift = (nr) & 7; \
_a += (nr) >> 3; \
\
asm volatile("bclr %2,(%1) # clear_bit reg" \
: "=m"(*_a) \
: "a"(_a), "d"(1 << shift), "m"(*_a) \
: "memory", "cc"); \
})
#define clear_bit(nr, addr) ___clear_bit((nr), (addr))
static inline void __clear_bit(int nr, volatile void *addr)
{
unsigned int *a = (unsigned int *) addr;
int mask;
a += nr >> 5;
mask = 1 << (nr & 0x1f);
*a &= ~mask;
}
/*
* test bit
*/
static inline int test_bit(int nr, const volatile void *addr)
{
return 1UL & (((const unsigned int *) addr)[nr >> 5] >> (nr & 31));
}
/*
* change bit
*/
static inline void __change_bit(int nr, volatile void *addr)
{
int mask;
unsigned int *a = (unsigned int *) addr;
a += nr >> 5;
mask = 1 << (nr & 0x1f);
*a ^= mask;
}
extern void change_bit(int nr, volatile void *addr);
/*
* test and set bit
*/
#define __test_and_set_bit(nr,addr) \
({ \
volatile unsigned char *_a = (unsigned char *)(addr); \
const unsigned shift = (nr) & 7; \
unsigned epsw; \
_a += (nr) >> 3; \
\
asm volatile("bset %3,(%2) # test_set_bit reg\n" \
"mov epsw,%1" \
: "=m"(*_a), "=d"(epsw) \
: "a"(_a), "d"(1 << shift), "m"(*_a) \
: "memory", "cc"); \
\
!(epsw & EPSW_FLAG_Z); \
})
#define test_and_set_bit(nr, addr) __test_and_set_bit((nr), (addr))
/*
* test and clear bit
*/
#define __test_and_clear_bit(nr, addr) \
({ \
volatile unsigned char *_a = (unsigned char *)(addr); \
const unsigned shift = (nr) & 7; \
unsigned epsw; \
_a += (nr) >> 3; \
\
asm volatile("bclr %3,(%2) # test_clear_bit reg\n" \
"mov epsw,%1" \
: "=m"(*_a), "=d"(epsw) \
: "a"(_a), "d"(1 << shift), "m"(*_a) \
: "memory", "cc"); \
\
!(epsw & EPSW_FLAG_Z); \
})
#define test_and_clear_bit(nr, addr) __test_and_clear_bit((nr), (addr))
/*
* test and change bit
*/
static inline int __test_and_change_bit(int nr, volatile void *addr)
{
int mask, retval;
unsigned int *a = (unsigned int *)addr;
a += nr >> 5;
mask = 1 << (nr & 0x1f);
retval = (mask & *a) != 0;
*a ^= mask;
return retval;
}
extern int test_and_change_bit(int nr, volatile void *addr);
#include <asm-generic/bitops/lock.h>
#ifdef __KERNEL__
/**
* __ffs - find first bit set
* @x: the word to search
*
* - return 31..0 to indicate bit 31..0 most least significant bit set
* - if no bits are set in x, the result is undefined
*/
static inline __attribute__((const))
unsigned long __ffs(unsigned long x)
{
int bit;
asm("bsch %2,%0" : "=r"(bit) : "0"(0), "r"(x & -x) : "cc");
return bit;
}
/*
* special slimline version of fls() for calculating ilog2_u32()
* - note: no protection against n == 0
*/
static inline __attribute__((const))
int __ilog2_u32(u32 n)
{
int bit;
asm("bsch %2,%0" : "=r"(bit) : "0"(0), "r"(n) : "cc");
return bit;
}
/**
* fls - find last bit set
* @x: the word to search
*
* This is defined the same way as ffs:
* - return 32..1 to indicate bit 31..0 most significant bit set
* - return 0 to indicate no bits set
*/
static inline __attribute__((const))
int fls(int x)
{
return (x != 0) ? __ilog2_u32(x) + 1 : 0;
}
/**
* __fls - find last (most-significant) set bit in a long word
* @word: the word to search
*
* Undefined if no set bit exists, so code should check against 0 first.
*/
static inline unsigned long __fls(unsigned long word)
{
return __ilog2_u32(word);
}
/**
* ffs - find first bit set
* @x: the word to search
*
* - return 32..1 to indicate bit 31..0 most least significant bit set
* - return 0 to indicate no bits set
*/
static inline __attribute__((const))
int ffs(int x)
{
/* Note: (x & -x) gives us a mask that is the least significant
* (rightmost) 1-bit of the value in x.
*/
return fls(x & -x);
}
#include <asm-generic/bitops/ffz.h>
#include <asm-generic/bitops/fls64.h>
#include <asm-generic/bitops/find.h>
#include <asm-generic/bitops/sched.h>
#include <asm-generic/bitops/hweight.h>
#define ext2_set_bit_atomic(lock, nr, addr) \
test_and_set_bit((nr) ^ 0x18, (addr))
#define ext2_clear_bit_atomic(lock, nr, addr) \
test_and_clear_bit((nr) ^ 0x18, (addr))
#include <asm-generic/bitops/ext2-non-atomic.h>
#include <asm-generic/bitops/minix-le.h>
#endif /* __KERNEL__ */
#endif /* __ASM_BITOPS_H */
|
