fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / include / asm-h8300 / semaphore.h
blobf3ffff83ff09c0fab806b98e8159cb7f440f3605
1 #ifndef _H8300_SEMAPHORE_H
2 #define _H8300_SEMAPHORE_H
4 #define RW_LOCK_BIAS 0x01000000
6 #ifndef __ASSEMBLY__
8 #include <linux/linkage.h>
9 #include <linux/wait.h>
10 #include <linux/spinlock.h>
11 #include <linux/rwsem.h>
13 #include <asm/system.h>
14 #include <asm/atomic.h>
17 * Interrupt-safe semaphores..
19 * (C) Copyright 1996 Linus Torvalds
21 * H8/300 version by Yoshinori Sato
25 struct semaphore {
26 atomic_t count;
27 int sleepers;
28 wait_queue_head_t wait;
31 #define __SEMAPHORE_INITIALIZER(name, n) \
32 { \
33 .count = ATOMIC_INIT(n), \
34 .sleepers = 0, \
35 .wait = __WAIT_QUEUE_HEAD_INITIALIZER((name).wait) \
38 #define __DECLARE_SEMAPHORE_GENERIC(name,count) \
39 struct semaphore name = __SEMAPHORE_INITIALIZER(name,count)
41 #define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC(name,1)
43 static inline void sema_init (struct semaphore *sem, int val)
45 *sem = (struct semaphore)__SEMAPHORE_INITIALIZER(*sem, val);
48 static inline void init_MUTEX (struct semaphore *sem)
50 sema_init(sem, 1);
53 static inline void init_MUTEX_LOCKED (struct semaphore *sem)
55 sema_init(sem, 0);
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 */);
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);
68 extern spinlock_t semaphore_wake_lock;
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
75 static inline void down(struct semaphore * sem)
77 register atomic_t *count asm("er0");
79 might_sleep();
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");
101 static inline int down_interruptible(struct semaphore * sem)
103 register atomic_t *count asm("er0");
105 might_sleep();
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;
129 static inline int down_trylock(struct semaphore * sem)
131 register atomic_t *count asm("er0");
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;
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().
165 static inline void up(struct semaphore * sem)
167 register atomic_t *count asm("er0");
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");
188 #endif /* __ASSEMBLY__ */
190 #endif