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authorHarvey Harrison <harvey.harrison@gmail.com>2009-01-06 17:56:22 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-06 21:10:26 -0500
commit292b4d0978e3bbb087a83ce77e389c7b462a093c (patch)
treed240d83e170696543688f9f58384c1ede986b507 /arch/avr32/include/asm/swab.h
parent991c0e6d1ae3df59f0ddfe05edecec8319e35a1b (diff)
avr32: introduce asm/swab.h
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/avr32/include/asm/swab.h')
-rw-r--r--arch/avr32/include/asm/swab.h35
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/avr32/include/asm/swab.h b/arch/avr32/include/asm/swab.h
new file mode 100644
index 000000000000..a14aa5b46d98
--- /dev/null
+++ b/arch/avr32/include/asm/swab.h
@@ -0,0 +1,35 @@
1/*
2 * AVR32 byteswapping functions.
3 */
4#ifndef __ASM_AVR32_SWAB_H
5#define __ASM_AVR32_SWAB_H
6
7#include <asm/types.h>
8#include <linux/compiler.h>
9
10#define __SWAB_64_THRU_32__
11
12#ifdef __CHECKER__
13extern unsigned long __builtin_bswap_32(unsigned long x);
14extern unsigned short __builtin_bswap_16(unsigned short x);
15#endif
16
17/*
18 * avr32-linux-gcc versions earlier than 4.2 improperly sign-extends
19 * the result.
20 */
21#if !(__GNUC__ == 4 && __GNUC_MINOR__ < 2)
22static inline __attribute_const__ __u16 __arch_swab16(__u16 val)
23{
24 return __builtin_bswap_16(val);
25}
26#define __arch_swab16 __arch_swab16
27
28static inline __attribute_const__ __u32 __arch_swab32(__u32 val)
29{
30 return __builtin_bswap_32(val);
31}
32#define __arch_swab32 __arch_swab32
33#endif
34
35#endif /* __ASM_AVR32_SWAB_H */