diff options
| author | Simon Glass <sjg@chromium.org> | 2017-01-16 07:04:04 -0700 |
|---|---|---|
| committer | Bin Meng <bmeng.cn@gmail.com> | 2017-02-06 11:38:46 +0800 |
| commit | 909780506773a9b09ae88cb267dbfa6a8d0caa7b (patch) | |
| tree | 64133064438ee57da4f9f1aebac94266136a7b1a /arch/x86/include/asm | |
| parent | 84547b4e667b99ff69d4682d15ae051664a1b409 (diff) | |
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>
Diffstat (limited to 'arch/x86/include/asm')
| -rw-r--r-- | arch/x86/include/asm/byteorder.h | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/arch/x86/include/asm/byteorder.h b/arch/x86/include/asm/byteorder.h index 7dfeb8bbed..a2d1fd8703 100644 --- a/arch/x86/include/asm/byteorder.h +++ b/arch/x86/include/asm/byteorder.h @@ -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) |