kill DECLARE_MUTEX_LOCKED
[linux-2.6.git] / include / asm-h8300 / semaphore.h
1 #ifndef _H8300_SEMAPHORE_H
2 #define _H8300_SEMAPHORE_H
3
4 #define RW_LOCK_BIAS             0x01000000
5
6 #ifndef __ASSEMBLY__
7
8 #include <linux/linkage.h>
9 #include <linux/wait.h>
10 #include <linux/spinlock.h>
11 #include <linux/rwsem.h>
12
13 #include <asm/system.h>
14 #include <asm/atomic.h>
15
16 /*
17  * Interrupt-safe semaphores..
18  *
19  * (C) Copyright 1996 Linus Torvalds
20  *
21  * H8/300 version by Yoshinori Sato
22  */
23
24
25 struct semaphore {
26         atomic_t count;
27         int sleepers;
28         wait_queue_head_t wait;
29 };
30
31 #define __SEMAPHORE_INITIALIZER(name, n)                                \
32 {                                                                       \
33         .count          = ATOMIC_INIT(n),                               \
34         .sleepers       = 0,                                            \
35         .wait           = __WAIT_QUEUE_HEAD_INITIALIZER((name).wait)    \
36 }
37
38 #define __DECLARE_SEMAPHORE_GENERIC(name,count) \
39         struct semaphore name = __SEMAPHORE_INITIALIZER(name,count)
40
41 #define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC(name,1)
42
43 static inline void sema_init (struct semaphore *sem, int val)
44 {
45         *sem = (struct semaphore)__SEMAPHORE_INITIALIZER(*sem, val);
46 }
47
48 static inline void init_MUTEX (struct semaphore *sem)
49 {
50         sema_init(sem, 1);
51 }
52
53 static inline void init_MUTEX_LOCKED (struct semaphore *sem)
54 {
55         sema_init(sem, 0);
56 }
57
58 asmlinkage void __down_failed(void /* special register calling convention */);
59 asmlinkage int  __down_failed_interruptible(void  /* params in registers */);
60 asmlinkage int  __down_failed_trylock(void  /* params in registers */);
61 asmlinkage void __up_wakeup(void /* special register calling convention */);
62
63 asmlinkage void __down(struct semaphore * sem);
64 asmlinkage int  __down_interruptible(struct semaphore * sem);
65 asmlinkage int  __down_trylock(struct semaphore * sem);
66 asmlinkage void __up(struct semaphore * sem);
67
68 extern spinlock_t semaphore_wake_lock;
69
70 /*
71  * This is ugly, but we want the default case to fall through.
72  * "down_failed" is a special asm handler that calls the C
73  * routine that actually waits. See arch/m68k/lib/semaphore.S
74  */
75 static inline void down(struct semaphore * sem)
76 {
77         register atomic_t *count asm("er0");
78
79         might_sleep();
80
81         count = &(sem->count);
82         __asm__ __volatile__(
83                 "stc ccr,r3l\n\t"
84                 "orc #0x80,ccr\n\t"
85                 "mov.l %2, er1\n\t"
86                 "dec.l #1,er1\n\t"
87                 "mov.l er1,%0\n\t"
88                 "bpl 1f\n\t"
89                 "ldc r3l,ccr\n\t"
90                 "mov.l %1,er0\n\t"
91                 "jsr @___down\n\t"
92                 "bra 2f\n"
93                 "1:\n\t"
94                 "ldc r3l,ccr\n"
95                 "2:"
96                 : "=m"(*count)
97                 : "g"(sem),"m"(*count)
98                 : "cc",  "er1", "er2", "er3");
99 }
100
101 static inline int down_interruptible(struct semaphore * sem)
102 {
103         register atomic_t *count asm("er0");
104
105         might_sleep();
106
107         count = &(sem->count);
108         __asm__ __volatile__(
109                 "stc ccr,r1l\n\t"
110                 "orc #0x80,ccr\n\t"
111                 "mov.l %3, er2\n\t"
112                 "dec.l #1,er2\n\t"
113                 "mov.l er2,%1\n\t"
114                 "bpl 1f\n\t"
115                 "ldc r1l,ccr\n\t"
116                 "mov.l %2,er0\n\t"
117                 "jsr @___down_interruptible\n\t"
118                 "bra 2f\n"
119                 "1:\n\t"
120                 "ldc r1l,ccr\n\t"
121                 "sub.l %0,%0\n\t"
122                 "2:\n\t"
123                 : "=r" (count),"=m" (*count)
124                 : "g"(sem),"m"(*count)
125                 : "cc", "er1", "er2", "er3");
126         return (int)count;
127 }
128
129 static inline int down_trylock(struct semaphore * sem)
130 {
131         register atomic_t *count asm("er0");
132
133         count = &(sem->count);
134         __asm__ __volatile__(
135                 "stc ccr,r3l\n\t"
136                 "orc #0x80,ccr\n\t"
137                 "mov.l %3,er2\n\t"
138                 "dec.l #1,er2\n\t"
139                 "mov.l er2,%0\n\t"
140                 "bpl 1f\n\t"
141                 "ldc r3l,ccr\n\t"
142                 "jmp @3f\n\t"
143                 LOCK_SECTION_START(".align 2\n\t")
144                 "3:\n\t"
145                 "mov.l %2,er0\n\t"
146                 "jsr @___down_trylock\n\t"
147                 "jmp @2f\n\t"
148                 LOCK_SECTION_END
149                 "1:\n\t"
150                 "ldc r3l,ccr\n\t"
151                 "sub.l %1,%1\n"
152                 "2:"
153                 : "=m" (*count),"=r"(count)
154                 : "g"(sem),"m"(*count)
155                 : "cc", "er1","er2", "er3");
156         return (int)count;
157 }
158
159 /*
160  * Note! This is subtle. We jump to wake people up only if
161  * the semaphore was negative (== somebody was waiting on it).
162  * The default case (no contention) will result in NO
163  * jumps for both down() and up().
164  */
165 static inline void up(struct semaphore * sem)
166 {
167         register atomic_t *count asm("er0");
168
169         count = &(sem->count);
170         __asm__ __volatile__(
171                 "stc ccr,r3l\n\t"
172                 "orc #0x80,ccr\n\t"
173                 "mov.l %2,er1\n\t"
174                 "inc.l #1,er1\n\t"
175                 "mov.l er1,%0\n\t"
176                 "ldc r3l,ccr\n\t"
177                 "sub.l er2,er2\n\t"
178                 "cmp.l er2,er1\n\t"
179                 "bgt 1f\n\t"
180                 "mov.l %1,er0\n\t"
181                 "jsr @___up\n"
182                 "1:"
183                 : "=m"(*count)
184                 : "g"(sem),"m"(*count)
185                 : "cc", "er1", "er2", "er3");
186 }
187
188 #endif /* __ASSEMBLY__ */
189
190 #endif