Disintegrate asm/system.h for AVR32

Disintegrate asm/system.h for AVR32.  This has not been compiled at all.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Haavard Skinnemoen <hskinnemoen@gmail.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/arch/avr32/include/asm/barrier.h b/arch/avr32/include/asm/barrier.h
new file mode 100644
index 000000000000..808001c9cf8c
--- /dev/null
+++ b/arch/avr32/include/asm/barrier.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __ASM_AVR32_BARRIER_H
+#define __ASM_AVR32_BARRIER_H
+
+#define mb()                    asm volatile("" : : : "memory")
+#define rmb()                   mb()
+#define wmb()                   asm volatile("sync 0" : : : "memory")
+#define read_barrier_depends()  do { } while(0)
+#define set_mb(var, value)      do { var = value; mb(); } while(0)
+
+#ifdef CONFIG_SMP
+# error "The AVR32 port does not support SMP"
+#else
+# define smp_mb()               barrier()
+# define smp_rmb()              barrier()
+# define smp_wmb()              barrier()
+# define smp_read_barrier_depends() do { } while(0)
+#endif
+
+
+#endif /* __ASM_AVR32_BARRIER_H */