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

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1996, 99, 2003 by Ralf Baechle
   7  */
   8 #ifndef _ASM_SWAB_H
   9 #define _ASM_SWAB_H
  10
  11 #include <linux/compiler.h>
  12 #include <linux/types.h>
  13
  14 #define __SWAB_64_THRU_32__
  15
  16 #ifdef CONFIG_CPU_MIPSR2
  17
  18 static inline __attribute_const__ __u16 __arch_swab16(__u16 x)
  19 {
  20         __asm__(
  21         "       wsbh    %0, %1                  \n"
  22         : "=r" (x)
  23         : "r" (x));
  24
  25         return x;
  26 }
  27 #define __arch_swab16 __arch_swab16
  28
  29 static inline __attribute_const__ __u32 __arch_swab32(__u32 x)
  30 {
  31         __asm__(
  32         "       wsbh    %0, %1                  \n"
  33         "       rotr    %0, %0, 16              \n"
  34         : "=r" (x)
  35         : "r" (x));
  36
  37         return x;
  38 }
  39 #define __arch_swab32 __arch_swab32
  40
  41 /*
  42  * Having already checked for CONFIG_CPU_MIPSR2, enable the
  43  * optimized version for 64-bit kernel on r2 CPUs.
  44  */
  45 #ifdef CONFIG_64BIT
  46 static inline __attribute_const__ __u64 __arch_swab64(__u64 x)
  47 {
  48         __asm__(
  49         "       dsbh    %0, %1\n"
  50         "       dshd    %0, %0"
  51         : "=r" (x)
  52         : "r" (x));
  53
  54         return x;
  55 }
  56 #define __arch_swab64 __arch_swab64
  57 #endif /* CONFIG_64BIT */
  58 #endif /* CONFIG_CPU_MIPSR2 */
  59 #endif /* _ASM_SWAB_H */