aboutsummaryrefslogtreecommitdiffstats
path: root/include/asm-sparc/semaphore.h
blob: 8018f9f4d497d85863b38610e4b651b2f6f7341f (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
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
#ifndef _SPARC_SEMAPHORE_H
#define _SPARC_SEMAPHORE_H

/* Dinky, good for nothing, just barely irq safe, Sparc semaphores. */

#ifdef __KERNEL__

#include <asm/atomic.h>
#include <linux/wait.h>
#include <linux/rwsem.h>

struct semaphore {
	atomic24_t count;
	int sleepers;
	wait_queue_head_t wait;
};

#define __SEMAPHORE_INITIALIZER(name, n)				\
{									\
	.count		= ATOMIC24_INIT(n),				\
	.sleepers	= 0,						\
	.wait		= __WAIT_QUEUE_HEAD_INITIALIZER((name).wait)	\
}

#define __DECLARE_SEMAPHORE_GENERIC(name,count) \
	struct semaphore name = __SEMAPHORE_INITIALIZER(name,count)

#define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC(name,1)

static inline void sema_init (struct semaphore *sem, int val)
{
	atomic24_set(&sem->count, val);
	sem->sleepers = 0;
	init_waitqueue_head(&sem->wait);
}

static inline void init_MUTEX (struct semaphore *sem)
{
	sema_init(sem, 1);
}

static inline void init_MUTEX_LOCKED (struct semaphore *sem)
{
	sema_init(sem, 0);
}

extern void __down(struct semaphore * sem);
extern int __down_interruptible(struct semaphore * sem);
extern int __down_trylock(struct semaphore * sem);
extern void __up(struct semaphore * sem);

static inline void down(struct semaphore * sem)
{
	register volatile int *ptr asm("g1");
	register int increment asm("g2");

	might_sleep();

	ptr = &(sem->count.counter);
	increment = 1;

	__asm__ __volatile__(
	"mov	%%o7, %%g4\n\t"
	"call	___atomic24_sub\n\t"
	" add	%%o7, 8, %%o7\n\t"
	"tst	%%g2\n\t"
	"bl	2f\n\t"
	" nop\n"
	"1:\n\t"
	".subsection 2\n"
	"2:\n\t"
	"save	%%sp, -64, %%sp\n\t"
	"mov	%%g1, %%l1\n\t"
	"mov	%%g5, %%l5\n\t"
	"call	%3\n\t"
	" mov	%%g1, %%o0\n\t"
	"mov	%%l1, %%g1\n\t"
	"ba	1b\n\t"
	" restore %%l5, %%g0, %%g5\n\t"
	".previous\n"
	: "=&r" (increment)
	: "0" (increment), "r" (ptr), "i" (__down)
	: "g3", "g4", "g7", "memory", "cc");
}

static inline int down_interruptible(struct semaphore * sem)
{
	register volatile int *ptr asm("g1");
	register int increment asm("g2");

	might_sleep();

	ptr = &(sem->count.counter);
	increment = 1;

	__asm__ __volatile__(
	"mov	%%o7, %%g4\n\t"
	"call	___atomic24_sub\n\t"
	" add	%%o7, 8, %%o7\n\t"
	"tst	%%g2\n\t"
	"bl	2f\n\t"
	" clr	%%g2\n"
	"1:\n\t"
	".subsection 2\n"
	"2:\n\t"
	"save	%%sp, -64, %%sp\n\t"
	"mov	%%g1, %%l1\n\t"
	"mov	%%g5, %%l5\n\t"
	"call	%3\n\t"
	" mov	%%g1, %%o0\n\t"
	"mov	%%l1, %%g1\n\t"
	"mov	%%l5, %%g5\n\t"
	"ba	1b\n\t"
	" restore %%o0, %%g0, %%g2\n\t"
	".previous\n"
	: "=&r" (increment)
	: "0" (increment), "r" (ptr), "i" (__down_interruptible)
	: "g3", "g4", "g7", "memory", "cc");

	return increment;
}

static inline int down_trylock(struct semaphore * sem)
{
	register volatile int *ptr asm("g1");
	register int increment asm("g2");

	ptr = &(sem->count.counter);
	increment = 1;

	__asm__ __volatile__(
	"mov	%%o7, %%g4\n\t"
	"call	___atomic24_sub\n\t"
	" add	%%o7, 8, %%o7\n\t"
	"tst	%%g2\n\t"
	"bl	2f\n\t"
	" clr	%%g2\n"
	"1:\n\t"
	".subsection 2\n"
	"2:\n\t"
	"save	%%sp, -64, %%sp\n\t"
	"mov	%%g1, %%l1\n\t"
	"mov	%%g5, %%l5\n\t"
	"call	%3\n\t"
	" mov	%%g1, %%o0\n\t"
	"mov	%%l1, %%g1\n\t"
	"mov	%%l5, %%g5\n\t"
	"ba	1b\n\t"
	" restore %%o0, %%g0, %%g2\n\t"
	".previous\n"
	: "=&r" (increment)
	: "0" (increment), "r" (ptr), "i" (__down_trylock)
	: "g3", "g4", "g7", "memory", "cc");

	return increment;
}

static inline void up(struct semaphore * sem)
{
	register volatile int *ptr asm("g1");
	register int increment asm("g2");

	ptr = &(sem->count.counter);
	increment = 1;

	__asm__ __volatile__(
	"mov	%%o7, %%g4\n\t"
	"call	___atomic24_add\n\t"
	" add	%%o7, 8, %%o7\n\t"
	"tst	%%g2\n\t"
	"ble	2f\n\t"
	" nop\n"
	"1:\n\t"
	".subsection 2\n"
	"2:\n\t"
	"save	%%sp, -64, %%sp\n\t"
	"mov	%%g1, %%l1\n\t"
	"mov	%%g5, %%l5\n\t"
	"call	%3\n\t"
	" mov	%%g1, %%o0\n\t"
	"mov	%%l1, %%g1\n\t"
	"ba	1b\n\t"
	" restore %%l5, %%g0, %%g5\n\t"
	".previous\n"
	: "=&r" (increment)
	: "0" (increment), "r" (ptr), "i" (__up)
	: "g3", "g4", "g7", "memory", "cc");
}	

#endif /* __KERNEL__ */

#endif /* !(_SPARC_SEMAPHORE_H) */