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;
16 #ifdef WAITQUEUE_DEBUG
21 #ifdef WAITQUEUE_DEBUG
22 # define __SEM_DEBUG_INIT(name) \
23 , (long)&(name).__magic
25 # define __SEM_DEBUG_INIT(name)
28 #define __SEMAPHORE_INITIALIZER(name,count) \
29 { ATOMIC24_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 atomic24_set(&sem->count, val);
45 init_waitqueue_head(&sem->wait);
46 #ifdef WAITQUEUE_DEBUG
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");
71 #ifdef WAITQUEUE_DEBUG
72 CHECK_MAGIC(sem->__magic);
76 ptr = &(sem->count.counter);
81 "call ___atomic24_sub\n\t"
82 " add %%o7, 8, %%o7\n\t"
89 "save %%sp, -64, %%sp\n\t"
96 " restore %%l5, %%g0, %%g5\n\t"
99 : "0" (increment), "r" (ptr), "i" (__down)
100 : "g3", "g4", "g7", "memory", "cc");
103 static inline int down_interruptible(struct semaphore * sem)
105 register volatile int *ptr asm("g1");
106 register int increment asm("g2");
108 #ifdef WAITQUEUE_DEBUG
109 CHECK_MAGIC(sem->__magic);
113 ptr = &(sem->count.counter);
116 __asm__ __volatile__(
118 "call ___atomic24_sub\n\t"
119 " add %%o7, 8, %%o7\n\t"
126 "save %%sp, -64, %%sp\n\t"
130 " mov %%g1, %%o0\n\t"
134 " restore %%o0, %%g0, %%g2\n\t"
137 : "0" (increment), "r" (ptr), "i" (__down_interruptible)
138 : "g3", "g4", "g7", "memory", "cc");
143 static inline int down_trylock(struct semaphore * sem)
145 register volatile int *ptr asm("g1");
146 register int increment asm("g2");
148 #ifdef WAITQUEUE_DEBUG
149 CHECK_MAGIC(sem->__magic);
152 ptr = &(sem->count.counter);
155 __asm__ __volatile__(
157 "call ___atomic24_sub\n\t"
158 " add %%o7, 8, %%o7\n\t"
165 "save %%sp, -64, %%sp\n\t"
169 " mov %%g1, %%o0\n\t"
173 " restore %%o0, %%g0, %%g2\n\t"
176 : "0" (increment), "r" (ptr), "i" (__down_trylock)
177 : "g3", "g4", "g7", "memory", "cc");
182 static inline void up(struct semaphore * sem)
184 register volatile int *ptr asm("g1");
185 register int increment asm("g2");
187 #ifdef WAITQUEUE_DEBUG
188 CHECK_MAGIC(sem->__magic);
191 ptr = &(sem->count.counter);
194 __asm__ __volatile__(
196 "call ___atomic24_add\n\t"
197 " add %%o7, 8, %%o7\n\t"
204 "save %%sp, -64, %%sp\n\t"
208 " mov %%g1, %%o0\n\t"
211 " restore %%l5, %%g0, %%g5\n\t"
214 : "0" (increment), "r" (ptr), "i" (__up)
215 : "g3", "g4", "g7", "memory", "cc");
218 #endif /* __KERNEL__ */
220 #endif /* !(_SPARC_SEMAPHORE_H) */