arch/mips/include/uapi/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 #if !defined(__mips16) &&                                       \
  17         ((defined(__mips_isa_rev) && (__mips_isa_rev >= 2)) ||  \
  18          defined(_MIPS_ARCH_LOONGSON3A))
  19
  20 static inline __attribute_const__ __u16 __arch_swab16(__u16 x)
  21 {
  22         __asm__(
  23         "       .set    push                    \n"
  24         "       .set    arch=mips32r2           \n"
  25         "       wsbh    %0, %1                  \n"
  26         "       .set    pop                     \n"
  27         : "=r" (x)
  28         : "r" (x));
  29
  30         return x;
  31 }
  32 #define __arch_swab16 __arch_swab16
  33
  34 static inline __attribute_const__ __u32 __arch_swab32(__u32 x)
  35 {
  36         __asm__(
  37         "       .set    push                    \n"
  38         "       .set    arch=mips32r2           \n"
  39         "       wsbh    %0, %1                  \n"
  40         "       rotr    %0, %0, 16              \n"
  41         "       .set    pop                     \n"
  42         : "=r" (x)
  43         : "r" (x));
  44
  45         return x;
  46 }
  47 #define __arch_swab32 __arch_swab32
  48
  49 /*
  50  * Having already checked for MIPS R2, enable the optimized version for
  51  * 64-bit kernel on r2 CPUs.
  52  */
  53 #ifdef __mips64
  54 static inline __attribute_const__ __u64 __arch_swab64(__u64 x)
  55 {
  56         __asm__(
  57         "       .set    push                    \n"
  58         "       .set    arch=mips64r2           \n"
  59         "       dsbh    %0, %1                  \n"
  60         "       dshd    %0, %0                  \n"
  61         "       .set    pop                     \n"
  62         : "=r" (x)
  63         : "r" (x));
  64
  65         return x;
  66 }
  67 #define __arch_swab64 __arch_swab64
  68 #endif /* __mips64 */
  69 #endif /* (not __mips16) and (MIPS R2 or newer or Loongson 3A) */
  70 #endif /* _ASM_SWAB_H */