1 files changed, 92 insertions, 0 deletions
diff --git a/kernel/arch/h8300/include/asm/atomic.h b/kernel/arch/h8300/include/asm/atomic.h
new file mode 100644
index 000000000..4435a445a
--- /dev/null
+++ b/kernel/arch/h8300/include/asm/atomic.h
@@ -0,0 +1,92 @@
+#ifndef __ARCH_H8300_ATOMIC__
+#define __ARCH_H8300_ATOMIC__
+
+#include <linux/types.h>
+#include <asm/cmpxchg.h>
+
+/*
+ * Atomic operations that C can't guarantee us.  Useful for
+ * resource counting etc..
+ */
+
+#define ATOMIC_INIT(i)	{ (i) }
+
+#define atomic_read(v)		READ_ONCE((v)->counter)
+#define atomic_set(v, i)	WRITE_ONCE(((v)->counter), (i))
+
+#include <linux/kernel.h>
+
+#define ATOMIC_OP_RETURN(op, c_op)				\
+static inline int atomic_##op##_return(int i, atomic_t *v)	\
+{								\
+	h8300flags flags;					\
+	int ret;						\
+								\
+	flags = arch_local_irq_save();				\
+	ret = v->counter c_op i;				\
+	arch_local_irq_restore(flags);				\
+	return ret;						\
+}
+
+#define ATOMIC_OP(op, c_op)					\
+static inline void atomic_##op(int i, atomic_t *v)		\
+{								\
+	h8300flags flags;					\
+								\
+	flags = arch_local_irq_save();				\
+	v->counter c_op i;					\
+	arch_local_irq_restore(flags);				\
+}
+
+ATOMIC_OP_RETURN(add, +=)
+ATOMIC_OP_RETURN(sub, -=)
+
+ATOMIC_OP(and, &=)
+ATOMIC_OP(or,  |=)
+ATOMIC_OP(xor, ^=)
+
+#undef ATOMIC_OP_RETURN
+#undef ATOMIC_OP
+
+#define atomic_add(i, v)		(void)atomic_add_return(i, v)
+#define atomic_add_negative(a, v)	(atomic_add_return((a), (v)) < 0)
+
+#define atomic_sub(i, v)		(void)atomic_sub_return(i, v)
+#define atomic_sub_and_test(i, v)	(atomic_sub_return(i, v) == 0)
+
+#define atomic_inc_return(v)		atomic_add_return(1, v)
+#define atomic_dec_return(v)		atomic_sub_return(1, v)
+
+#define atomic_inc(v)			(void)atomic_inc_return(v)
+#define atomic_inc_and_test(v)		(atomic_inc_return(v) == 0)
+
+#define atomic_dec(v)			(void)atomic_dec_return(v)
+#define atomic_dec_and_test(v)		(atomic_dec_return(v) == 0)
+
+static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
+{
+	int ret;
+	h8300flags flags;
+
+	flags = arch_local_irq_save();
+	ret = v->counter;
+	if (likely(ret == old))
+		v->counter = new;
+	arch_local_irq_restore(flags);
+	return ret;
+}
+
+static inline int __atomic_add_unless(atomic_t *v, int a, int u)
+{
+	int ret;
+	h8300flags flags;
+
+	flags = arch_local_irq_save();
+	ret = v->counter;
+	if (ret != u)
+		v->counter += a;
+	arch_local_irq_restore(flags);
+	return ret;
+}
+
+#endif /* __ARCH_H8300_ATOMIC __ */