LXR linux/arch/sh/include/uapi/asm/swab.h

   1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2#ifndef __ASM_SH_SWAB_H
   3#define __ASM_SH_SWAB_H
   4
   5/*
   6 * Copyright (C) 1999  Niibe Yutaka
   7 * Copyright (C) 2000, 2001  Paolo Alberelli
   8 */
   9#include <linux/compiler.h>
  10#include <linux/types.h>
  11#include <asm-generic/swab.h>
  12
  13static inline __attribute_const__ __u32 __arch_swab32(__u32 x)
  14{
  15        __asm__(
  16                "swap.b         %1, %0\n\t"
  17                "swap.w         %0, %0\n\t"
  18                "swap.b         %0, %0"
  19                : "=r" (x)
  20                : "r" (x));
  21
  22        return x;
  23}
  24#define __arch_swab32 __arch_swab32
  25
  26static inline __attribute_const__ __u16 __arch_swab16(__u16 x)
  27{
  28        __asm__(
  29                "swap.b         %1, %0"
  30                : "=r" (x)
  31                :  "r" (x));
  32
  33        return x;
  34}
  35#define __arch_swab16 __arch_swab16
  36
  37static inline __u64 __arch_swab64(__u64 val)
  38{
  39        union {
  40                struct { __u32 a,b; } s;
  41                __u64 u;
  42        } v, w;
  43        v.u = val;
  44        w.s.b = __arch_swab32(v.s.a);
  45        w.s.a = __arch_swab32(v.s.b);
  46        return w.u;
  47}
  48#define __arch_swab64 __arch_swab64
  49
  50#endif /* __ASM_SH_SWAB_H */
  51