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
  13 static 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
  26 static 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
  37 static 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 */