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| author |   Greentime Hu <greentime@andestech.com> | 2017-10-25 14:27:22 +0800 |
|---|---|---|
| committer | Greentime Hu <greentime@andestech.com> | 2018-02-22 10:44:33 +0800 |
| commit | ace02e2badd12e34d781780517614c42dbbf8068 (patch) | |
| tree | dcc51bcd5f0af76c52ef6e2e7276bae881967af6 /arch/nds32/include/asm/swab.h | |
| parent | nds32: Signal handling support (diff) | |
| download | linux-dev-ace02e2badd12e34d781780517614c42dbbf8068.tar.xz linux-dev-ace02e2badd12e34d781780517614c42dbbf8068.zip | |
nds32: Library functions
This patch add support for various library functions.
Signed-off-by: Vincent Chen <vincentc@andestech.com>
Signed-off-by: Greentime Hu <greentime@andestech.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/nds32/include/asm/swab.h')
| -rw-r--r-- | arch/nds32/include/asm/swab.h | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/nds32/include/asm/swab.h b/arch/nds32/include/asm/swab.h new file mode 100644 index 000000000000..e01a755a37d2 --- /dev/null +++ b/arch/nds32/include/asm/swab.h @@ -0,0 +1,35 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2005-2017 Andes Technology Corporation + +#ifndef __NDS32_SWAB_H__ +#define __NDS32_SWAB_H__ + +#include <linux/types.h> +#include <linux/compiler.h> + +static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x) +{ + __asm__("wsbh %0, %0\n\t" /* word swap byte within halfword */ + "rotri %0, %0, #16\n" + :"=r"(x) + :"0"(x)); + return x; +} + +static __inline__ __attribute_const__ __u16 ___arch__swab16(__u16 x) +{ + __asm__("wsbh %0, %0\n" /* word swap byte within halfword */ + :"=r"(x) + :"0"(x)); + return x; +} + +#define __arch_swab32(x) ___arch__swab32(x) +#define __arch_swab16(x) ___arch__swab16(x) + +#if !defined(__STRICT_ANSI__) || defined(__KERNEL__) +#define __BYTEORDER_HAS_U64__ +#define __SWAB_64_THRU_32__ +#endif + +#endif /* __NDS32_SWAB_H__ */ |