1 files changed, 85 insertions, 0 deletions
diff --git a/include/asm-arm/atomic.h b/include/asm-arm/atomic.h
new file mode 100644
index 000000000..df9e941db
--- /dev/null
+++ b/include/asm-arm/atomic.h
@@ -0,0 +1,85 @@
+/*
+ * linux/include/asm-arm/atomic.h
+ *
+ * Copyright (c) 1996 Russell King.
+ *
+ * Changelog:
+ *  27-06-1996	RMK	Created
+ *  13-04-1997	RMK	Made functions atomic!
+ *  07-12-1997	RMK	Upgraded for v2.1.
+ */
+#ifndef __ASM_ARM_ATOMIC_H
+#define __ASM_ARM_ATOMIC_H
+
+#include <asm/system.h>
+
+#ifdef __SMP__
+#error SMP not supported
+#endif
+
+typedef struct { int counter; } atomic_t;
+
+#define ATOMIC_INIT(i)	{ (i) }
+
+#define atomic_read(v)	((v)->counter)
+#define atomic_set(v,i)	(((v)->counter) = (i))
+
+static __inline__ void atomic_add(int i, volatile atomic_t *v)
+{
+	unsigned long flags;
+
+	save_flags_cli (flags);
+	v->counter += i;
+	restore_flags (flags);
+}
+
+static __inline__ void atomic_sub(int i, volatile atomic_t *v)
+{
+	unsigned long flags;
+
+	save_flags_cli (flags);
+	v->counter -= i;
+	restore_flags (flags);
+}
+
+static __inline__ void atomic_inc(volatile atomic_t *v)
+{
+	unsigned long flags;
+
+	save_flags_cli (flags);
+	v->counter += 1;
+	restore_flags (flags);
+}
+
+static __inline__ void atomic_dec(volatile atomic_t *v)
+{
+	unsigned long flags;
+
+	save_flags_cli (flags);
+	v->counter -= 1;
+	restore_flags (flags);
+}
+
+static __inline__ int atomic_dec_and_test(volatile atomic_t *v)
+{
+	unsigned long flags;
+	int result;
+
+	save_flags_cli (flags);
+	v->counter -= 1;
+	result = (v->counter == 0);
+	restore_flags (flags);
+
+	return result;
+}
+
+static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *addr)
+{
+	unsigned long flags;
+
+	save_flags_cli (flags);
+	*addr &= ~mask;
+	restore_flags (flags);
+}
+
+#endif