1 #ifndef _SPARC_SEMAPHORE_H
2 #define _SPARC_SEMAPHORE_H
4 /* Dinky, good for nothing, just barely irq safe, Sparc semaphores. */
8 #include <asm/atomic.h>
9 #include <linux/wait.h>
10 #include <linux/rwsem.h>
15 wait_queue_head_t wait;
22 # define __SEM_DEBUG_INIT(name) \
23 , (long)&(name).__magic
25 # define __SEM_DEBUG_INIT(name)
28 #define __SEMAPHORE_INITIALIZER(name,count) \
29 { ATOMIC_INIT(count), 0, __WAIT_QUEUE_HEAD_INITIALIZER((name).wait) \
30 __SEM_DEBUG_INIT(name) }
32 #define __MUTEX_INITIALIZER(name) \
33 __SEMAPHORE_INITIALIZER(name,1)
35 #define __DECLARE_SEMAPHORE_GENERIC(name,count) \
36 struct semaphore name = __SEMAPHORE_INITIALIZER(name,count)
38 #define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC(name,1)
39 #define DECLARE_MUTEX_LOCKED(name) __DECLARE_SEMAPHORE_GENERIC(name,0)
41 static inline void sema_init (struct semaphore *sem, int val)
43 atomic_set(&sem->count, val);
45 init_waitqueue_head(&sem->wait);
47 sem->__magic = (long)&sem->__magic;
51 static inline void init_MUTEX (struct semaphore *sem)
56 static inline void init_MUTEX_LOCKED (struct semaphore *sem)
61 extern void __down(struct semaphore * sem);
62 extern int __down_interruptible(struct semaphore * sem);
63 extern int __down_trylock(struct semaphore * sem);
64 extern void __up(struct semaphore * sem);
66 static inline void down(struct semaphore * sem)
68 register volatile int *ptr asm("g1");
69 register int increment asm("g2");
72 CHECK_MAGIC(sem->__magic);
75 ptr = &(sem->count.counter);
80 "call ___atomic_sub\n\t"
81 " add %%o7, 8, %%o7\n\t"
88 "save %%sp, -64, %%sp\n\t"
95 " restore %%l5, %%g0, %%g5\n\t"
98 : "0" (increment), "r" (ptr), "i" (__down)
99 : "g3", "g4", "g7", "memory", "cc");
102 static inline int down_interruptible(struct semaphore * sem)
104 register volatile int *ptr asm("g1");
105 register int increment asm("g2");
108 CHECK_MAGIC(sem->__magic);
111 ptr = &(sem->count.counter);
114 __asm__ __volatile__(
116 "call ___atomic_sub\n\t"
117 " add %%o7, 8, %%o7\n\t"
124 "save %%sp, -64, %%sp\n\t"
128 " mov %%g1, %%o0\n\t"
132 " restore %%o0, %%g0, %%g2\n\t"
135 : "0" (increment), "r" (ptr), "i" (__down_interruptible)
136 : "g3", "g4", "g7", "memory", "cc");
141 static inline int down_trylock(struct semaphore * sem)
143 register volatile int *ptr asm("g1");
144 register int increment asm("g2");
147 CHECK_MAGIC(sem->__magic);
150 ptr = &(sem->count.counter);
153 __asm__ __volatile__(
155 "call ___atomic_sub\n\t"
156 " add %%o7, 8, %%o7\n\t"
163 "save %%sp, -64, %%sp\n\t"
167 " mov %%g1, %%o0\n\t"
171 " restore %%o0, %%g0, %%g2\n\t"
174 : "0" (increment), "r" (ptr), "i" (__down_trylock)
175 : "g3", "g4", "g7", "memory", "cc");
180 static inline void up(struct semaphore * sem)
182 register volatile int *ptr asm("g1");
183 register int increment asm("g2");
186 CHECK_MAGIC(sem->__magic);
189 ptr = &(sem->count.counter);
192 __asm__ __volatile__(
194 "call ___atomic_add\n\t"
195 " add %%o7, 8, %%o7\n\t"
202 "save %%sp, -64, %%sp\n\t"
206 " mov %%g1, %%o0\n\t"
209 " restore %%l5, %%g0, %%g5\n\t"
212 : "0" (increment), "r" (ptr), "i" (__up)
213 : "g3", "g4", "g7", "memory", "cc");
216 static inline int sem_getcount(struct semaphore *sem)
218 return atomic_read(&sem->count);
221 #endif /* __KERNEL__ */
223 #endif /* !(_SPARC_SEMAPHORE_H) */