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
|
#ifndef __ASM_SPINLOCK_H
#define __ASM_SPINLOCK_H
#include <asm/atomic.h>
#include <asm/rwlock.h>
#include <asm/page.h>
#include <linux/config.h>
#include <linux/compiler.h>
/*
* Your basic SMP spinlocks, allowing only a single CPU anywhere
*
* Simple spin lock operations. There are two variants, one clears IRQ's
* on the local processor, one does not.
*
* We make no fairness assumptions. They have a cost.
*
* (the type definitions are in asm/spinlock_types.h)
*/
#define __raw_spin_is_locked(x) \
(*(volatile signed char *)(&(x)->slock) <= 0)
#define __raw_spin_lock_string \
"\n1:\t" \
"lock ; decb %0\n\t" \
"jns 3f\n" \
"2:\t" \
"rep;nop\n\t" \
"cmpb $0,%0\n\t" \
"jle 2b\n\t" \
"jmp 1b\n" \
"3:\n\t"
#define __raw_spin_lock_string_flags \
"\n1:\t" \
"lock ; decb %0\n\t" \
"jns 5f\n" \
"2:\t" \
"testl $0x200, %1\n\t" \
"jz 4f\n\t" \
"sti\n" \
"3:\t" \
"rep;nop\n\t" \
"cmpb $0, %0\n\t" \
"jle 3b\n\t" \
"cli\n\t" \
"jmp 1b\n" \
"4:\t" \
"rep;nop\n\t" \
"cmpb $0, %0\n\t" \
"jg 1b\n\t" \
"jmp 4b\n" \
"5:\n\t"
#define __raw_spin_lock_string_up \
"\n\tdecb %0"
static inline void __raw_spin_lock(raw_spinlock_t *lock)
{
alternative_smp(
__raw_spin_lock_string,
__raw_spin_lock_string_up,
"=m" (lock->slock) : : "memory");
}
static inline void __raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long flags)
{
alternative_smp(
__raw_spin_lock_string_flags,
__raw_spin_lock_string_up,
"=m" (lock->slock) : "r" (flags) : "memory");
}
static inline int __raw_spin_trylock(raw_spinlock_t *lock)
{
char oldval;
__asm__ __volatile__(
"xchgb %b0,%1"
:"=q" (oldval), "=m" (lock->slock)
:"0" (0) : "memory");
return oldval > 0;
}
/*
* __raw_spin_unlock based on writing $1 to the low byte.
* This method works. Despite all the confusion.
* (except on PPro SMP or if we are using OOSTORE, so we use xchgb there)
* (PPro errata 66, 92)
*/
#if !defined(CONFIG_X86_OOSTORE) && !defined(CONFIG_X86_PPRO_FENCE)
#define __raw_spin_unlock_string \
"movb $1,%0" \
:"=m" (lock->slock) : : "memory"
static inline void __raw_spin_unlock(raw_spinlock_t *lock)
{
__asm__ __volatile__(
__raw_spin_unlock_string
);
}
#else
#define __raw_spin_unlock_string \
"xchgb %b0, %1" \
:"=q" (oldval), "=m" (lock->slock) \
:"0" (oldval) : "memory"
static inline void __raw_spin_unlock(raw_spinlock_t *lock)
{
char oldval = 1;
__asm__ __volatile__(
__raw_spin_unlock_string
);
}
#endif
#define __raw_spin_unlock_wait(lock) \
do { while (__raw_spin_is_locked(lock)) cpu_relax(); } while (0)
/*
* Read-write spinlocks, allowing multiple readers
* but only one writer.
*
* NOTE! it is quite common to have readers in interrupts
* but no interrupt writers. For those circumstances we
* can "mix" irq-safe locks - any writer needs to get a
* irq-safe write-lock, but readers can get non-irqsafe
* read-locks.
*
* On x86, we implement read-write locks as a 32-bit counter
* with the high bit (sign) being the "contended" bit.
*
* The inline assembly is non-obvious. Think about it.
*
* Changed to use the same technique as rw semaphores. See
* semaphore.h for details. -ben
*
* the helpers are in arch/i386/kernel/semaphore.c
*/
/**
* read_can_lock - would read_trylock() succeed?
* @lock: the rwlock in question.
*/
#define __raw_read_can_lock(x) ((int)(x)->lock > 0)
/**
* write_can_lock - would write_trylock() succeed?
* @lock: the rwlock in question.
*/
#define __raw_write_can_lock(x) ((x)->lock == RW_LOCK_BIAS)
static inline void __raw_read_lock(raw_rwlock_t *rw)
{
__build_read_lock(rw, "__read_lock_failed");
}
static inline void __raw_write_lock(raw_rwlock_t *rw)
{
__build_write_lock(rw, "__write_lock_failed");
}
static inline int __raw_read_trylock(raw_rwlock_t *lock)
{
atomic_t *count = (atomic_t *)lock;
atomic_dec(count);
if (atomic_read(count) >= 0)
return 1;
atomic_inc(count);
return 0;
}
static inline int __raw_write_trylock(raw_rwlock_t *lock)
{
atomic_t *count = (atomic_t *)lock;
if (atomic_sub_and_test(RW_LOCK_BIAS, count))
return 1;
atomic_add(RW_LOCK_BIAS, count);
return 0;
}
static inline void __raw_read_unlock(raw_rwlock_t *rw)
{
asm volatile(LOCK_PREFIX "incl %0" :"=m" (rw->lock) : : "memory");
}
static inline void __raw_write_unlock(raw_rwlock_t *rw)
{
asm volatile(LOCK_PREFIX "addl $" RW_LOCK_BIAS_STR ", %0"
: "=m" (rw->lock) : : "memory");
}
#endif /* __ASM_SPINLOCK_H */
|
