ulinux/archs/x86/utils/endian.h

   1 #ifndef ULINUX_ARCH_UTILS_ENDIAN_H
   2 #define ULINUX_ARCH_UTILS_ENDIAN_H
   3 /*******************************************************************************
   4 this code is protected by the GNU affero GPLv3
   5 author:Sylvain BERTRAND (sylvain.bertrand AT gmail dot com)
   6 *******************************************************************************/
   7 #ifdef __GNUC__
   8 static inline ulinux_u16 ulinux_cpu2be16(ulinux_u16 v)
   9 {
  10   return (ulinux_u16)((((ulinux_u16)(v)&(ulinux_u16)0x00ffU)<<8)
  11                                    |(((ulinux_u16)(v)&(ulinux_u16)0xff00U)>>8));
  12 }
  13
  14 static inline ulinux_u32 ulinux_cpu2be32(ulinux_u32 v)
  15 {
  16   asm("bswapl %0":"=r" (v):"0" (v));
  17   return v;
  18 }
  19
  20 static inline ulinux_u64 ulinux_cpu2be64(ulinux_u64 val)
  21 {
  22   union{
  23     struct{
  24       ulinux_u32 a;
  25       ulinux_u32 b;
  26     } s;
  27     ulinux_u64 u;
  28   } v;
  29   v.u=val;
  30   asm("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
  31     : "=r" (v.s.a), "=r" (v.s.b)
  32     : "0" (v.s.a), "1" (v.s.b));
  33   return v.u;
  34 }
  35 #else
  36 ulinux_u16 ulinux_cpu2be16(ulinux_u16 v);
  37 ulinux_u32 ulinux_cpu2be32(ulinux_u32 v);
  38 ulinux_u64 ulinux_cpu2be64(ulinux_u64 val);
  39 #endif
  40
  41 #define ulinux_be162cpu(v) ulinux_cpu2be16(v)
  42 #define ulinux_be322cpu(v) ulinux_cpu2be32(v)
  43 #define ulinux_be642cpu(v) ulinux_cpu2be64(v)
  44
  45 /*little endian*/
  46 #define ulinux_cpu2le32(v) (v)
  47 #define ulinux_cpu2le64(v) (v)
  48 #define ulinux_le322cpu(v) (v)
  49 #define ulinux_le642cpu(v) (v)
  50 #endif