OpenRISC: Headers

Signed-off-by: Jonas Bonn <jonas@southpole.se>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 51 insertions, 0 deletions

diff --git a/arch/openrisc/include/asm/unaligned.h b/arch/openrisc/include/asm/unaligned.h
new file mode 100644
index 000000000000..1141cbd6fd72
--- /dev/null
+++ b/arch/openrisc/include/asm/unaligned.h
@@ -0,0 +1,51 @@
+/*
+ * OpenRISC Linux
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others.  All original copyrights apply as per the original source
+ * declaration.
+ *
+ * OpenRISC implementation:
+ * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
+ * et al.
+ *
+ * This program 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.
+ */
+
+#ifndef __ASM_OPENRISC_UNALIGNED_H
+#define __ASM_OPENRISC_UNALIGNED_H
+
+/*
+ * This is copied from the generic implementation and the C-struct
+ * variant replaced with the memmove variant.  The GCC compiler
+ * for the OR32 arch optimizes too aggressively for the C-struct
+ * variant to work, so use the memmove variant instead.
+ *
+ * It may be worth considering implementing the unaligned access
+ * exception handler and allowing unaligned accesses (access_ok.h)...
+ * not sure if it would be much of a performance win without further
+ * investigation.
+ */
+#include <asm/byteorder.h>
+
+#if defined(__LITTLE_ENDIAN)
+# include <linux/unaligned/le_memmove.h>
+# include <linux/unaligned/be_byteshift.h>
+# include <linux/unaligned/generic.h>
+# define get_unaligned  __get_unaligned_le
+# define put_unaligned  __put_unaligned_le
+#elif defined(__BIG_ENDIAN)
+# include <linux/unaligned/be_memmove.h>
+# include <linux/unaligned/le_byteshift.h>
+# include <linux/unaligned/generic.h>
+# define get_unaligned  __get_unaligned_be
+# define put_unaligned  __put_unaligned_be
+#else
+# error need to define endianess
+#endif
+
+#endif /* __ASM_OPENRISC_UNALIGNED_H */