arch/mips/include/uapi/asm/swab.h

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 /*
   3  * This file is subject to the terms and conditions of the GNU General Public
   4  * License.  See the file "COPYING" in the main directory of this archive
   5  * for more details.
   6  *
   7  * Copyright (C) 1996, 99, 2003 by Ralf Baechle
   8  */
   9 #ifndef _ASM_SWAB_H
  10 #define _ASM_SWAB_H
  11
  12 #include <linux/compiler.h>
  13 #include <linux/types.h>
  14
  15 #define __SWAB_64_THRU_32__
  16
  17 #if !defined(__mips16) &&                                       \
  18         ((defined(__mips_isa_rev) && (__mips_isa_rev >= 2)) ||  \
  19          defined(_MIPS_ARCH_LOONGSON3A))
  20
  21 static inline __attribute_const__ __u16 __arch_swab16(__u16 x)
  22 {
  23         __asm__(
  24         "       .set    push                    \n"
  25         "       .set    arch=mips32r2           \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_const__ __u32 __arch_swab32(__u32 x)
  36 {
  37         __asm__(
  38         "       .set    push                    \n"
  39         "       .set    arch=mips32r2           \n"
  40         "       wsbh    %0, %1                  \n"
  41         "       rotr    %0, %0, 16              \n"
  42         "       .set    pop                     \n"
  43         : "=r" (x)
  44         : "r" (x));
  45
  46         return x;
  47 }
  48 #define __arch_swab32 __arch_swab32
  49
  50 /*
  51  * Having already checked for MIPS R2, enable the optimized version for
  52  * 64-bit kernel on r2 CPUs.
  53  */
  54 #ifdef __mips64
  55 static inline __attribute_const__ __u64 __arch_swab64(__u64 x)
  56 {
  57         __asm__(
  58         "       .set    push                    \n"
  59         "       .set    arch=mips64r2           \n"
  60         "       dsbh    %0, %1                  \n"
  61         "       dshd    %0, %0                  \n"
  62         "       .set    pop                     \n"
  63         : "=r" (x)
  64         : "r" (x));
  65
  66         return x;
  67 }
  68 #define __arch_swab64 __arch_swab64
  69 #endif /* __mips64 */
  70 #endif /* (not __mips16) and (MIPS R2 or newer or Loongson 3A) */
  71 #endif /* _ASM_SWAB_H */