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| author | Ralf Baechle <ralf@linux-mips.org> | 2006-02-15 14:06:34 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2006-03-21 14:27:44 +0100 |
| commit | bbad8123f3a40a7b262e8e52d0bc10da67d719bb (patch) | |
| tree | 5ff67d7159b91f5144efaf6dfc63bafde1150de7 /include | |
| parent | [MIPS] Add early console for Cobalt. (diff) | |
| download | linux-bbad8123f3a40a7b262e8e52d0bc10da67d719bb.tar.xz linux-bbad8123f3a40a7b262e8e52d0bc10da67d719bb.zip | |
[MIPS] MIPS64 R2 optimizations for 64-bit endianess swapping.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-mips/byteorder.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/asm-mips/byteorder.h b/include/asm-mips/byteorder.h index 584f8128fffd..aefc02f16fd8 100644 --- a/include/asm-mips/byteorder.h +++ b/include/asm-mips/byteorder.h @@ -39,6 +39,24 @@ static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x) } #define __arch__swab32(x) ___arch__swab32(x) +#ifdef CONFIG_CPU_MIPS64_R2 + +static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 x) +{ + __asm__( + " dsbh %0, %1 \n" + " dshd %0, %0 \n" + " drotr %0, %0, 32 \n" + : "=r" (x) + : "r" (x)); + + return x; +} + +#define __arch__swab64(x) ___arch__swab64(x) + +#endif /* CONFIG_CPU_MIPS64_R2 */ + #endif /* CONFIG_CPU_MIPSR2 */ #if !defined(__STRICT_ANSI__) || defined(__KERNEL__) |