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arm: introduce asm/swab.h

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Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Harvey Harrison
2009-01-06 14:56:30 -08:00
committed by Linus Torvalds
parent dd8b72c0cc
commit af8e24e96f
3 changed files with 52 additions and 32 deletions
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33
arch/arm/include/asm/byteorder.h
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@@ -15,38 +15,7 @@
#ifndef __ASM_ARM_BYTEORDER_H
#define __ASM_ARM_BYTEORDER_H
#include <linux/compiler.h>
#include <asm/types.h>
static inline __attribute_const__ __u32 ___arch__swab32(__u32 x)
{
__u32 t;
#ifndef __thumb__
if (!__builtin_constant_p(x)) {
/*
* The compiler needs a bit of a hint here to always do the
* right thing and not screw it up to different degrees
* depending on the gcc version.
*/
asm ("eor\t%0, %1, %1, ror #16" : "=r" (t) : "r" (x));
} else
#endif
t = x ^ ((x << 16) | (x >> 16)); /* eor r1,r0,r0,ror #16 */
x = (x << 24) | (x >> 8); /* mov r0,r0,ror #8 */
t &= ~0x00FF0000; /* bic r1,r1,#0x00FF0000 */
x ^= (t >> 8); /* eor r0,r0,r1,lsr #8 */
return x;
}
#define __arch__swab32(x) ___arch__swab32(x)
#if !defined(__STRICT_ANSI__) || defined(__KERNEL__)
# define __BYTEORDER_HAS_U64__
# define __SWAB_64_THRU_32__
#endif
#include <asm/swab.h>
#ifdef __ARMEB__
#include <linux/byteorder/big_endian.h>