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(__mips_isa_rev) && (__mips_isa_rev >= 2)) ||               \
  17     defined(_MIPS_ARCH_LOONGSON3A)
  18
  19 static inline __attribute__((nomips16)) __attribute_const__
  20                 __u16 __arch_swab16(__u16 x)
  21 {
  22         __asm__(
  23         "       .set    push                    \n"
  24         "       .set    arch=mips32r2           \n"
  25         "       .set    nomips16                \n"
  26         "       wsbh    %0, %1                  \n"
  27         "       .set    pop                     \n"
  28         : "=r" (x)
  29         : "r" (x));
  30
  31         return x;
  32 }
  33 #define __arch_swab16 __arch_swab16
  34
  35 static inline __attribute__((nomips16)) __attribute_const__
  36                 __u32 __arch_swab32(__u32 x)
  37 {
  38         __asm__(
  39         "       .set    push                    \n"
  40         "       .set    arch=mips32r2           \n"
  41         "       .set    nomips16                \n"
  42         "       wsbh    %0, %1                  \n"
  43         "       rotr    %0, %0, 16              \n"
  44         "       .set    pop                     \n"
  45         : "=r" (x)
  46         : "r" (x));
  47
  48         return x;
  49 }
  50 #define __arch_swab32 __arch_swab32
  51
  52 /*
  53  * Having already checked for MIPS R2, enable the optimized version for
  54  * 64-bit kernel on r2 CPUs.
  55  */
  56 #ifdef __mips64
  57 static inline __attribute__((nomips16)) __attribute_const__
  58                 __u64 __arch_swab64(__u64 x)
  59 {
  60         __asm__(
  61         "       .set    push                    \n"
  62         "       .set    arch=mips64r2           \n"
  63         "       .set    nomips16                \n"
  64         "       dsbh    %0, %1                  \n"
  65         "       dshd    %0, %0                  \n"
  66         "       .set    pop                     \n"
  67         : "=r" (x)
  68         : "r" (x));
  69
  70         return x;
  71 }
  72 #define __arch_swab64 __arch_swab64
  73 #endif /* __mips64 */
  74 #endif /* MIPS R2 or newer or Loongson 3A */
  75 #endif /* _ASM_SWAB_H */