release/src-rt-6.x.4708/linux/linux-2.6.36/arch/sh/include/asm/swab.h

   1 #ifndef __ASM_SH_SWAB_H
   2 #define __ASM_SH_SWAB_H
   3
   4 /*
   5  * Copyright (C) 1999  Niibe Yutaka
   6  * Copyright (C) 2000, 2001  Paolo Alberelli
   7  */
   8 #include <linux/compiler.h>
   9 #include <linux/types.h>
  10 #include <asm-generic/swab.h>
  11
  12 static inline __attribute_const__ __u32 __arch_swab32(__u32 x)
  13 {
  14         __asm__(
  15 #ifdef __SH5__
  16                 "byterev        %1, %0\n\t"
  17                 "shari          %0, 32, %0"
  18 #else
  19                 "swap.b         %1, %0\n\t"
  20                 "swap.w         %0, %0\n\t"
  21                 "swap.b         %0, %0"
  22 #endif
  23                 : "=r" (x)
  24                 : "r" (x));
  25
  26         return x;
  27 }
  28 #define __arch_swab32 __arch_swab32
  29
  30 static inline __attribute_const__ __u16 __arch_swab16(__u16 x)
  31 {
  32         __asm__(
  33 #ifdef __SH5__
  34                 "byterev        %1, %0\n\t"
  35                 "shari          %0, 32, %0"
  36 #else
  37                 "swap.b         %1, %0"
  38 #endif
  39                 : "=r" (x)
  40                 :  "r" (x));
  41
  42         return x;
  43 }
  44 #define __arch_swab16 __arch_swab16
  45
  46 static inline __u64 __arch_swab64(__u64 val)
  47 {
  48         union {
  49                 struct { __u32 a,b; } s;
  50                 __u64 u;
  51         } v, w;
  52         v.u = val;
  53         w.s.b = __arch_swab32(v.s.a);
  54         w.s.a = __arch_swab32(v.s.b);
  55         return w.u;
  56 }
  57 #define __arch_swab64 __arch_swab64
  58
  59 #endif /* __ASM_SH_SWAB_H */