include/asm-sh/byteorder.h

   1 #ifndef __ASM_SH_BYTEORDER_H
   2 #define __ASM_SH_BYTEORDER_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
  11 static inline __attribute_const__ __u32 ___arch__swab32(__u32 x)
  12 {
  13         __asm__(
  14 #ifdef CONFIG_SUPERH32
  15                 "swap.b         %0, %0\n\t"
  16                 "swap.w         %0, %0\n\t"
  17                 "swap.b         %0, %0"
  18 #else
  19                 "byterev        %0, %0\n\t"
  20                 "shari          %0, 32, %0"
  21 #endif
  22                 : "=r" (x)
  23                 : "0" (x));
  24
  25         return x;
  26 }
  27
  28 static inline __attribute_const__ __u16 ___arch__swab16(__u16 x)
  29 {
  30         __asm__(
  31 #ifdef CONFIG_SUPERH32
  32                 "swap.b         %0, %0"
  33 #else
  34                 "byterev        %0, %0\n\t"
  35                 "shari          %0, 32, %0"
  36
  37 #endif
  38                 : "=r" (x)
  39                 :  "0" (x));
  40
  41         return x;
  42 }
  43
  44 static inline __u64 ___arch__swab64(__u64 val)
  45 {
  46         union {
  47                 struct { __u32 a,b; } s;
  48                 __u64 u;
  49         } v, w;
  50         v.u = val;
  51         w.s.b = ___arch__swab32(v.s.a);
  52         w.s.a = ___arch__swab32(v.s.b);
  53         return w.u;
  54 }
  55
  56 #define __arch__swab64(x) ___arch__swab64(x)
  57 #define __arch__swab32(x) ___arch__swab32(x)
  58 #define __arch__swab16(x) ___arch__swab16(x)
  59
  60 #if !defined(__STRICT_ANSI__) || defined(__KERNEL__)
  61 #  define __BYTEORDER_HAS_U64__
  62 #  define __SWAB_64_THRU_32__
  63 #endif
  64
  65 #ifdef __LITTLE_ENDIAN__
  66 #include <linux/byteorder/little_endian.h>
  67 #else
  68 #include <linux/byteorder/big_endian.h>
  69 #endif
  70
  71 #endif /* __ASM_SH_BYTEORDER_H */