diff options
| author | Harvey Harrison <harvey.harrison@gmail.com> | 2009-01-06 14:56:29 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-06 18:10:27 -0800 |
| commit | dd8b72c0cc118196984f1bd23beed545d5087872 (patch) | |
| tree | 25c27cc8ae7b6a936e4d6bfad8e6c317f1d3aa5d /arch/alpha/include/asm/byteorder.h | |
| parent | c6f09f0c32e5e30b91dea901f00251173fe997f4 (diff) | |
alpha: 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/alpha/include/asm/byteorder.h')
| -rw-r--r-- | arch/alpha/include/asm/byteorder.h | 42 |
1 files changed, 1 insertions, 41 deletions
diff --git a/arch/alpha/include/asm/byteorder.h b/arch/alpha/include/asm/byteorder.h index 58e958fc7f1..6772f316870 100644 --- a/arch/alpha/include/asm/byteorder.h +++ b/arch/alpha/include/asm/byteorder.h @@ -1,47 +1,7 @@ #ifndef _ALPHA_BYTEORDER_H #define _ALPHA_BYTEORDER_H -#include <asm/types.h> -#include <linux/compiler.h> -#include <asm/compiler.h> - -#ifdef __GNUC__ - -static inline __attribute_const__ __u32 __arch__swab32(__u32 x) -{ - /* - * Unfortunately, we can't use the 6 instruction sequence - * on ev6 since the latency of the UNPKBW is 3, which is - * pretty hard to hide. Just in case a future implementation - * has a lower latency, here's the sequence (also by Mike Burrows) - * - * UNPKBW a0, v0 v0: 00AA00BB00CC00DD - * SLL v0, 24, a0 a0: BB00CC00DD000000 - * BIS v0, a0, a0 a0: BBAACCBBDDCC00DD - * EXTWL a0, 6, v0 v0: 000000000000BBAA - * ZAP a0, 0xf3, a0 a0: 00000000DDCC0000 - * ADDL a0, v0, v0 v0: ssssssssDDCCBBAA - */ - - __u64 t0, t1, t2, t3; - - t0 = __kernel_inslh(x, 7); /* t0 : 0000000000AABBCC */ - t1 = __kernel_inswl(x, 3); /* t1 : 000000CCDD000000 */ - t1 |= t0; /* t1 : 000000CCDDAABBCC */ - t2 = t1 >> 16; /* t2 : 0000000000CCDDAA */ - t0 = t1 & 0xFF00FF00; /* t0 : 00000000DD00BB00 */ - t3 = t2 & 0x00FF00FF; /* t3 : 0000000000CC00AA */ - t1 = t0 + t3; /* t1 : ssssssssDDCCBBAA */ - - return t1; -} - -#define __arch__swab32 __arch__swab32 - -#endif /* __GNUC__ */ - -#define __BYTEORDER_HAS_U64__ - +#include <asm/swab.h> #include <linux/byteorder/little_endian.h> #endif /* _ALPHA_BYTEORDER_H */ |