diff --git a/include/asm-v850/semaphore.h b/include/asm-v850/semaphore.h
new file mode 100644
index 0000000..c514062
--- /dev/null
+++ b/include/asm-v850/semaphore.h
@@ -0,0 +1,88 @@
+#ifndef __V850_SEMAPHORE_H__
+#define __V850_SEMAPHORE_H__
+
+#include <linux/linkage.h>
+#include <linux/spinlock.h>
+#include <linux/wait.h>
+#include <linux/rwsem.h>
+
+#include <asm/atomic.h>
+
+struct semaphore {
+	atomic_t count;
+	int sleepers;
+	wait_queue_head_t wait;
+};
+
+#define __SEMAPHORE_INITIALIZER(name,count)				      \
+	{ ATOMIC_INIT (count), 0,					      \
+	  __WAIT_QUEUE_HEAD_INITIALIZER ((name).wait) }
+
+#define __MUTEX_INITIALIZER(name)					      \
+	__SEMAPHORE_INITIALIZER (name,1)
+
+#define __DECLARE_SEMAPHORE_GENERIC(name,count)	\
+	struct semaphore name = __SEMAPHORE_INITIALIZER (name,count)
+
+#define DECLARE_MUTEX(name)		__DECLARE_SEMAPHORE_GENERIC (name,1)
+#define DECLARE_MUTEX_LOCKED(name)	__DECLARE_SEMAPHORE_GENERIC (name,0)
+
+extern inline void sema_init (struct semaphore *sem, int val)
+{
+	*sem = (struct semaphore)__SEMAPHORE_INITIALIZER((*sem),val);
+}
+
+static inline void init_MUTEX (struct semaphore *sem)
+{
+	sema_init (sem, 1);
+}
+
+static inline void init_MUTEX_LOCKED (struct semaphore *sem)
+{
+	sema_init (sem, 0);
+}
+
+/*
+ * special register calling convention
+ */
+asmlinkage void __down_failed (void);
+asmlinkage int  __down_interruptible_failed (void);
+asmlinkage int  __down_trylock_failed (void);
+asmlinkage void __up_wakeup (void);
+
+extern void __down (struct semaphore * sem);
+extern int  __down_interruptible (struct semaphore * sem);
+extern int  __down_trylock (struct semaphore * sem);
+extern void __up (struct semaphore * sem);
+
+extern inline void down (struct semaphore * sem)
+{
+	might_sleep();
+	if (atomic_dec_return (&sem->count) < 0)
+		__down (sem);
+}
+
+extern inline int down_interruptible (struct semaphore * sem)
+{
+	int ret = 0;
+	might_sleep();
+	if (atomic_dec_return (&sem->count) < 0)
+		ret = __down_interruptible (sem);
+	return ret;
+}
+
+extern inline int down_trylock (struct semaphore *sem)
+{
+	int ret = 0;
+	if (atomic_dec_return (&sem->count) < 0)
+		ret = __down_trylock (sem);
+	return ret;
+}
+
+extern inline void up (struct semaphore * sem)
+{
+	if (atomic_inc_return (&sem->count) <= 0)
+		__up (sem);
+}
+
+#endif /* __V850_SEMAPHORE_H__ */