1 files changed, 99 insertions, 0 deletions
diff --git a/include/asm-v850/atomic.h b/include/asm-v850/atomic.h
new file mode 100644
index 0000000..8284aa7
--- /dev/null
+++ b/include/asm-v850/atomic.h
@@ -0,0 +1,99 @@
+/*
+ * include/asm-v850/atomic.h -- Atomic operations
+ *
+ *  Copyright (C) 2001,02  NEC Corporation
+ *  Copyright (C) 2001,02  Miles Bader <miles@gnu.org>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License.  See the file COPYING in the main directory of this
+ * archive for more details.
+ *
+ * Written by Miles Bader <miles@gnu.org>
+ */
+
+#ifndef __V850_ATOMIC_H__
+#define __V850_ATOMIC_H__
+
+#include <linux/config.h>
+
+#include <asm/system.h>
+
+#ifdef CONFIG_SMP
+#error SMP not supported
+#endif
+
+typedef struct { int counter; } atomic_t;
+
+#define ATOMIC_INIT(i)	{ (i) }
+
+#ifdef __KERNEL__
+
+#define atomic_read(v)		((v)->counter)
+#define atomic_set(v,i)		(((v)->counter) = (i))
+
+extern __inline__ int atomic_add_return (int i, volatile atomic_t *v)
+{
+	unsigned long flags;
+	int res;
+
+	local_irq_save (flags);
+	res = v->counter + i;
+	v->counter = res;
+	local_irq_restore (flags);
+
+	return res;
+}
+
+static __inline__ int atomic_sub_return (int i, volatile atomic_t *v)
+{
+	unsigned long flags;
+	int res;
+
+	local_irq_save (flags);
+	res = v->counter - i;
+	v->counter = res;
+	local_irq_restore (flags);
+
+	return res;
+}
+
+static __inline__ void atomic_clear_mask (unsigned long mask, unsigned long *addr)
+{
+	unsigned long flags;
+
+	local_irq_save (flags);
+	*addr &= ~mask;
+	local_irq_restore (flags);
+}
+
+#endif
+
+#define atomic_add(i, v)	atomic_add_return ((i), (v))
+#define atomic_sub(i, v)	atomic_sub_return ((i), (v))
+
+#define atomic_dec_return(v)	atomic_sub_return (1, (v))
+#define atomic_inc_return(v)	atomic_add_return (1, (v))
+#define atomic_inc(v) 		atomic_inc_return (v)
+#define atomic_dec(v) 		atomic_dec_return (v)
+
+/*
+ * atomic_inc_and_test - increment and test
+ * @v: pointer of type atomic_t
+ *
+ * Atomically increments @v by 1
+ * and returns true if the result is zero, or false for all
+ * other cases.
+ */
+#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
+
+#define atomic_sub_and_test(i,v)	(atomic_sub_return ((i), (v)) == 0)
+#define atomic_dec_and_test(v)		(atomic_sub_return (1, (v)) == 0)
+#define atomic_add_negative(i,v)	(atomic_add_return ((i), (v)) < 0)
+
+/* Atomic operations are already serializing on ARM */
+#define smp_mb__before_atomic_dec()	barrier()
+#define smp_mb__after_atomic_dec()	barrier()
+#define smp_mb__before_atomic_inc()	barrier()
+#define smp_mb__after_atomic_inc()	barrier()
+
+#endif /* __V850_ATOMIC_H__ */