From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@ppc970.osdl.org>
Date: Sat, 16 Apr 2005 15:20:36 -0700
Subject: Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
---
 include/asm-arm/semaphore.h | 106 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 include/asm-arm/semaphore.h

(limited to 'include/asm-arm/semaphore.h')

diff --git a/include/asm-arm/semaphore.h b/include/asm-arm/semaphore.h
new file mode 100644
index 00000000000..60f33e6eb80
--- /dev/null
+++ b/include/asm-arm/semaphore.h
@@ -0,0 +1,106 @@
+/*
+ * linux/include/asm-arm/semaphore.h
+ */
+#ifndef __ASM_ARM_SEMAPHORE_H
+#define __ASM_ARM_SEMAPHORE_H
+
+#include <linux/linkage.h>
+#include <linux/spinlock.h>
+#include <linux/wait.h>
+#include <linux/rwsem.h>
+
+#include <asm/atomic.h>
+#include <asm/locks.h>
+
+struct semaphore {
+	atomic_t count;
+	int sleepers;
+	wait_queue_head_t wait;
+};
+
+#define __SEMAPHORE_INIT(name, cnt)				\
+{								\
+	.count	= ATOMIC_INIT(cnt),				\
+	.wait	= __WAIT_QUEUE_HEAD_INITIALIZER((name).wait),	\
+}
+
+#define __MUTEX_INITIALIZER(name) __SEMAPHORE_INIT(name,1)
+
+#define __DECLARE_SEMAPHORE_GENERIC(name,count)	\
+	struct semaphore name = __SEMAPHORE_INIT(name,count)
+
+#define DECLARE_MUTEX(name)		__DECLARE_SEMAPHORE_GENERIC(name,1)
+#define DECLARE_MUTEX_LOCKED(name)	__DECLARE_SEMAPHORE_GENERIC(name,0)
+
+static inline void sema_init(struct semaphore *sem, int val)
+{
+	atomic_set(&sem->count, val);
+	sem->sleepers = 0;
+	init_waitqueue_head(&sem->wait);
+}
+
+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);
+}
+
+static inline int sema_count(struct semaphore *sem)
+{
+	return atomic_read(&sem->count);
+}
+
+/*
+ * 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);
+
+/*
+ * This is ugly, but we want the default case to fall through.
+ * "__down" is the actual routine that waits...
+ */
+static inline void down(struct semaphore * sem)
+{
+	might_sleep();
+	__down_op(sem, __down_failed);
+}
+
+/*
+ * This is ugly, but we want the default case to fall through.
+ * "__down_interruptible" is the actual routine that waits...
+ */
+static inline int down_interruptible (struct semaphore * sem)
+{
+	might_sleep();
+	return __down_op_ret(sem, __down_interruptible_failed);
+}
+
+static inline int down_trylock(struct semaphore *sem)
+{
+	return __down_op_ret(sem, __down_trylock_failed);
+}
+
+/*
+ * Note! This is subtle. We jump to wake people up only if
+ * the semaphore was negative (== somebody was waiting on it).
+ * The default case (no contention) will result in NO
+ * jumps for both down() and up().
+ */
+static inline void up(struct semaphore * sem)
+{
+	__up_op(sem, __up_wakeup);
+}
+
+#endif
-- 
cgit v1.2.3-70-g09d2