LXR linux/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
  21static 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
  35static 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
  55static 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 */
  72