summaryrefslogtreecommitdiffstats
path: root/include/asm-alpha/spinlock.h
blob: 0c294c9b0c558a8a45f080b8e0b825fadbdf859f (plain)
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
#ifndef _ALPHA_SPINLOCK_H
#define _ALPHA_SPINLOCK_H

#include <asm/system.h>
#include <linux/kernel.h>
#include <asm/current.h>

/*
 * 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.
 */

#define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock)
#define __raw_spin_is_locked(x)	((x)->lock != 0)
#define __raw_spin_unlock_wait(x) \
		do { cpu_relax(); } while ((x)->lock)

static inline void __raw_spin_unlock(raw_spinlock_t * lock)
{
	mb();
	lock->lock = 0;
}

static inline void __raw_spin_lock(raw_spinlock_t * lock)
{
	long tmp;

	__asm__ __volatile__(
	"1:	ldl_l	%0,%1\n"
	"	bne	%0,2f\n"
	"	lda	%0,1\n"
	"	stl_c	%0,%1\n"
	"	beq	%0,2f\n"
	"	mb\n"
	".subsection 2\n"
	"2:	ldl	%0,%1\n"
	"	bne	%0,2b\n"
	"	br	1b\n"
	".previous"
	: "=&r" (tmp), "=m" (lock->lock)
	: "m"(lock->lock) : "memory");
}

static inline int __raw_spin_trylock(raw_spinlock_t *lock)
{
	return !test_and_set_bit(0, &lock->lock);
}

/***********************************************************/

static inline int __raw_read_can_lock(raw_rwlock_t *lock)
{
	return (lock->lock & 1) == 0;
}

static inline int __raw_write_can_lock(raw_rwlock_t *lock)
{
	return lock->lock == 0;
}

static inline void __raw_read_lock(raw_rwlock_t *lock)
{
	long regx;

	__asm__ __volatile__(
	"1:	ldl_l	%1,%0\n"
	"	blbs	%1,6f\n"
	"	subl	%1,2,%1\n"
	"	stl_c	%1,%0\n"
	"	beq	%1,6f\n"
	"	mb\n"
	".subsection 2\n"
	"6:	ldl	%1,%0\n"
	"	blbs	%1,6b\n"
	"	br	1b\n"
	".previous"
	: "=m" (*lock), "=&r" (regx)
	: "m" (*lock) : "memory");
}

static inline void __raw_write_lock(raw_rwlock_t *lock)
{
	long regx;

	__asm__ __volatile__(
	"1:	ldl_l	%1,%0\n"
	"	bne	%1,6f\n"
	"	lda	%1,1\n"
	"	stl_c	%1,%0\n"
	"	beq	%1,6f\n"
	"	mb\n"
	".subsection 2\n"
	"6:	ldl	%1,%0\n"
	"	bne	%1,6b\n"
	"	br	1b\n"
	".previous"
	: "=m" (*lock), "=&r" (regx)
	: "m" (*lock) : "memory");
}

static inline int __raw_read_trylock(raw_rwlock_t * lock)
{
	long regx;
	int success;

	__asm__ __volatile__(
	"1:	ldl_l	%1,%0\n"
	"	lda	%2,0\n"
	"	blbs	%1,2f\n"
	"	subl	%1,2,%2\n"
	"	stl_c	%2,%0\n"
	"	beq	%2,6f\n"
	"2:	mb\n"
	".subsection 2\n"
	"6:	br	1b\n"
	".previous"
	: "=m" (*lock), "=&r" (regx), "=&r" (success)
	: "m" (*lock) : "memory");

	return success;
}

static inline int __raw_write_trylock(raw_rwlock_t * lock)
{
	long regx;
	int success;

	__asm__ __volatile__(
	"1:	ldl_l	%1,%0\n"
	"	lda	%2,0\n"
	"	bne	%1,2f\n"
	"	lda	%2,1\n"
	"	stl_c	%2,%0\n"
	"	beq	%2,6f\n"
	"2:	mb\n"
	".subsection 2\n"
	"6:	br	1b\n"
	".previous"
	: "=m" (*lock), "=&r" (regx), "=&r" (success)
	: "m" (*lock) : "memory");

	return success;
}

static inline void __raw_read_unlock(raw_rwlock_t * lock)
{
	long regx;
	__asm__ __volatile__(
	"	mb\n"
	"1:	ldl_l	%1,%0\n"
	"	addl	%1,2,%1\n"
	"	stl_c	%1,%0\n"
	"	beq	%1,6f\n"
	".subsection 2\n"
	"6:	br	1b\n"
	".previous"
	: "=m" (*lock), "=&r" (regx)
	: "m" (*lock) : "memory");
}

static inline void __raw_write_unlock(raw_rwlock_t * lock)
{
	mb();
	lock->lock = 0;
}

#endif /* _ALPHA_SPINLOCK_H */
OpenPOWER on IntegriCloud