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x86: Fix up byteorder.h for x86_64 

Remove the very old x86 code and add support for 64-bit.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2017-01-16 07:04:04 -07:00 committed by Bin Meng
parent 84547b4e66
commit 9097805067
1 changed files with 9 additions and 8 deletions
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17
arch/x86/include/asm/byteorder.h
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@ -8,24 +8,25 @@
static __inline__ __u32 ___arch__swab32(__u32 x)
{
#ifdef CONFIG_X86_BSWAP
__asm__("bswap %0" : "=r" (x) : "0" (x));
#else
__asm__("xchgb %b0,%h0\n\t" /* swap lower bytes */
"rorl $16,%0\n\t" /* swap words */
"xchgb %b0,%h0" /* swap higher bytes */
:"=q" (x)
: "0" (x));
#endif
return x;
}
#define _constant_swab16(x) ((__u16)( \
(((__u16)(x) & (__u16)0x00ffU) << 8) | \
(((__u16)(x) & (__u16)0xff00U) >> 8)))
static __inline__ __u16 ___arch__swab16(__u16 x)
{
#if CONFIG_IS_ENABLED(X86_64)
return _constant_swab16(x);
#else
__asm__("xchgb %b0,%h0" /* swap bytes */ \
: "=q" (x) \
: "0" (x)); \
return x;
#endif
}
#define __arch__swab32(x) ___arch__swab32(x)