1 files changed, 109 insertions, 0 deletions
diff --git a/target/linux/ubicom32/files/arch/ubicom32/include/asm/semaphore-helper.h b/target/linux/ubicom32/files/arch/ubicom32/include/asm/semaphore-helper.h
new file mode 100644
index 000000000..ad0aaf0a2
--- /dev/null
+++ b/target/linux/ubicom32/files/arch/ubicom32/include/asm/semaphore-helper.h
@@ -0,0 +1,109 @@
+/*
+ * arch/ubicom32/include/asm/semaphore-helper.h
+ *   Semaphore related definitions for Ubicom32 architecture.
+ *
+ * (C) Copyright 2009, Ubicom, Inc.
+ *
+ * This file is part of the Ubicom32 Linux Kernel Port.
+ *
+ * The Ubicom32 Linux Kernel Port is free software: you can redistribute
+ * it and/or modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * The Ubicom32 Linux Kernel Port is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
+ * the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Ubicom32 Linux Kernel Port.  If not,
+ * see <http://www.gnu.org/licenses/>.
+ *
+ * Ubicom32 implementation derived from (with many thanks):
+ *   arch/m68knommu
+ *   arch/blackfin
+ *   arch/parisc
+ */
+#ifndef _ASM_UBICOM32_SEMAPHORE_HELPER_H
+#define _ASM_UBICOM32_SEMAPHORE_HELPER_H
+
+/*
+ * SMP- and interrupt-safe semaphores helper functions.
+ *
+ * (C) Copyright 1996 Linus Torvalds
+ *
+ * m68k version by Andreas Schwab
+ */
+
+
+/*
+ * These two _must_ execute atomically wrt each other.
+ */
+static inline void wake_one_more(struct semaphore * sem)
+{
+	atomic_inc(&sem->waking);
+}
+
+static inline int waking_non_zero(struct semaphore *sem)
+{
+	int ret;
+	unsigned long flags;
+
+	spin_lock_irqsave(&semaphore_wake_lock, flags);
+	ret = 0;
+	if (atomic_read(&sem->waking) > 0) {
+		atomic_dec(&sem->waking);
+		ret = 1;
+	}
+	spin_unlock_irqrestore(&semaphore_wake_lock, flags);
+	return ret;
+}
+
+/*
+ * waking_non_zero_interruptible:
+ *	1	got the lock
+ *	0	go to sleep
+ *	-EINTR	interrupted
+ */
+static inline int waking_non_zero_interruptible(struct semaphore *sem,
+						struct task_struct *tsk)
+{
+	int ret;
+	unsigned long flags;
+
+	spin_lock_irqsave(&semaphore_wake_lock, flags);
+	ret = 0;
+	if (atomic_read(&sem->waking) > 0) {
+		atomic_dec(&sem->waking);
+		ret = 1;
+	} else if (signal_pending(tsk)) {
+		atomic_inc(&sem->count);
+		ret = -EINTR;
+	}
+	spin_unlock_irqrestore(&semaphore_wake_lock, flags);
+	return ret;
+}
+
+/*
+ * waking_non_zero_trylock:
+ *	1	failed to lock
+ *	0	got the lock
+ */
+static inline int waking_non_zero_trylock(struct semaphore *sem)
+{
+	int ret;
+	unsigned long flags;
+
+	spin_lock_irqsave(&semaphore_wake_lock, flags);
+	ret = 1;
+	if (atomic_read(&sem->waking) > 0) {
+		atomic_dec(&sem->waking);
+		ret = 0;
+	} else
+		atomic_inc(&sem->count);
+	spin_unlock_irqrestore(&semaphore_wake_lock, flags);
+	return ret;
+}
+
+#endif /* _ASM_UBICOM32_SEMAPHORE_HELPER_H */