aboutsummaryrefslogtreecommitdiffstats
path: root/include/asm-sparc/semaphore.h
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-sparc/semaphore.h
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'include/asm-sparc/semaphore.h')
-rw-r--r--include/asm-sparc/semaphore.h196
1 files changed, 196 insertions, 0 deletions
diff --git a/include/asm-sparc/semaphore.h b/include/asm-sparc/semaphore.h
new file mode 100644
index 000000000000..60ac5fd9eb48
--- /dev/null
+++ b/include/asm-sparc/semaphore.h
@@ -0,0 +1,196 @@
1#ifndef _SPARC_SEMAPHORE_H
2#define _SPARC_SEMAPHORE_H
3
4/* Dinky, good for nothing, just barely irq safe, Sparc semaphores. */
5
6#ifdef __KERNEL__
7
8#include <asm/atomic.h>
9#include <linux/wait.h>
10#include <linux/rwsem.h>
11
12struct semaphore {
13 atomic24_t count;
14 int sleepers;
15 wait_queue_head_t wait;
16};
17
18#define __SEMAPHORE_INITIALIZER(name, n) \
19{ \
20 .count = ATOMIC24_INIT(n), \
21 .sleepers = 0, \
22 .wait = __WAIT_QUEUE_HEAD_INITIALIZER((name).wait) \
23}
24
25#define __MUTEX_INITIALIZER(name) \
26 __SEMAPHORE_INITIALIZER(name,1)
27
28#define __DECLARE_SEMAPHORE_GENERIC(name,count) \
29 struct semaphore name = __SEMAPHORE_INITIALIZER(name,count)
30
31#define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC(name,1)
32#define DECLARE_MUTEX_LOCKED(name) __DECLARE_SEMAPHORE_GENERIC(name,0)
33
34static inline void sema_init (struct semaphore *sem, int val)
35{
36 atomic24_set(&sem->count, val);
37 sem->sleepers = 0;
38 init_waitqueue_head(&sem->wait);
39}
40
41static inline void init_MUTEX (struct semaphore *sem)
42{
43 sema_init(sem, 1);
44}
45
46static inline void init_MUTEX_LOCKED (struct semaphore *sem)
47{
48 sema_init(sem, 0);
49}
50
51extern void __down(struct semaphore * sem);
52extern int __down_interruptible(struct semaphore * sem);
53extern int __down_trylock(struct semaphore * sem);
54extern void __up(struct semaphore * sem);
55
56static inline void down(struct semaphore * sem)
57{
58 register volatile int *ptr asm("g1");
59 register int increment asm("g2");
60
61 might_sleep();
62
63 ptr = &(sem->count.counter);
64 increment = 1;
65
66 __asm__ __volatile__(
67 "mov %%o7, %%g4\n\t"
68 "call ___atomic24_sub\n\t"
69 " add %%o7, 8, %%o7\n\t"
70 "tst %%g2\n\t"
71 "bl 2f\n\t"
72 " nop\n"
73 "1:\n\t"
74 ".subsection 2\n"
75 "2:\n\t"
76 "save %%sp, -64, %%sp\n\t"
77 "mov %%g1, %%l1\n\t"
78 "mov %%g5, %%l5\n\t"
79 "call %3\n\t"
80 " mov %%g1, %%o0\n\t"
81 "mov %%l1, %%g1\n\t"
82 "ba 1b\n\t"
83 " restore %%l5, %%g0, %%g5\n\t"
84 ".previous\n"
85 : "=&r" (increment)
86 : "0" (increment), "r" (ptr), "i" (__down)
87 : "g3", "g4", "g7", "memory", "cc");
88}
89
90static inline int down_interruptible(struct semaphore * sem)
91{
92 register volatile int *ptr asm("g1");
93 register int increment asm("g2");
94
95 might_sleep();
96
97 ptr = &(sem->count.counter);
98 increment = 1;
99
100 __asm__ __volatile__(
101 "mov %%o7, %%g4\n\t"
102 "call ___atomic24_sub\n\t"
103 " add %%o7, 8, %%o7\n\t"
104 "tst %%g2\n\t"
105 "bl 2f\n\t"
106 " clr %%g2\n"
107 "1:\n\t"
108 ".subsection 2\n"
109 "2:\n\t"
110 "save %%sp, -64, %%sp\n\t"
111 "mov %%g1, %%l1\n\t"
112 "mov %%g5, %%l5\n\t"
113 "call %3\n\t"
114 " mov %%g1, %%o0\n\t"
115 "mov %%l1, %%g1\n\t"
116 "mov %%l5, %%g5\n\t"
117 "ba 1b\n\t"
118 " restore %%o0, %%g0, %%g2\n\t"
119 ".previous\n"
120 : "=&r" (increment)
121 : "0" (increment), "r" (ptr), "i" (__down_interruptible)
122 : "g3", "g4", "g7", "memory", "cc");
123
124 return increment;
125}
126
127static inline int down_trylock(struct semaphore * sem)
128{
129 register volatile int *ptr asm("g1");
130 register int increment asm("g2");
131
132 ptr = &(sem->count.counter);
133 increment = 1;
134
135 __asm__ __volatile__(
136 "mov %%o7, %%g4\n\t"
137 "call ___atomic24_sub\n\t"
138 " add %%o7, 8, %%o7\n\t"
139 "tst %%g2\n\t"
140 "bl 2f\n\t"
141 " clr %%g2\n"
142 "1:\n\t"
143 ".subsection 2\n"
144 "2:\n\t"
145 "save %%sp, -64, %%sp\n\t"
146 "mov %%g1, %%l1\n\t"
147 "mov %%g5, %%l5\n\t"
148 "call %3\n\t"
149 " mov %%g1, %%o0\n\t"
150 "mov %%l1, %%g1\n\t"
151 "mov %%l5, %%g5\n\t"
152 "ba 1b\n\t"
153 " restore %%o0, %%g0, %%g2\n\t"
154 ".previous\n"
155 : "=&r" (increment)
156 : "0" (increment), "r" (ptr), "i" (__down_trylock)
157 : "g3", "g4", "g7", "memory", "cc");
158
159 return increment;
160}
161
162static inline void up(struct semaphore * sem)
163{
164 register volatile int *ptr asm("g1");
165 register int increment asm("g2");
166
167 ptr = &(sem->count.counter);
168 increment = 1;
169
170 __asm__ __volatile__(
171 "mov %%o7, %%g4\n\t"
172 "call ___atomic24_add\n\t"
173 " add %%o7, 8, %%o7\n\t"
174 "tst %%g2\n\t"
175 "ble 2f\n\t"
176 " nop\n"
177 "1:\n\t"
178 ".subsection 2\n"
179 "2:\n\t"
180 "save %%sp, -64, %%sp\n\t"
181 "mov %%g1, %%l1\n\t"
182 "mov %%g5, %%l5\n\t"
183 "call %3\n\t"
184 " mov %%g1, %%o0\n\t"
185 "mov %%l1, %%g1\n\t"
186 "ba 1b\n\t"
187 " restore %%l5, %%g0, %%g5\n\t"
188 ".previous\n"
189 : "=&r" (increment)
190 : "0" (increment), "r" (ptr), "i" (__up)
191 : "g3", "g4", "g7", "memory", "cc");
192}
193
194#endif /* __KERNEL__ */
195
196#endif /* !(_SPARC_SEMAPHORE_H) */
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-03 09:42:38 -0500