LXR linux/arch/x86/include/uapi/asm/swab.h

   1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2#ifndef _ASM_X86_SWAB_H
   3#define _ASM_X86_SWAB_H
   4
   5#include <linux/types.h>
   6#include <linux/compiler.h>
   7
   8static inline __attribute_const__ __u32 __arch_swab32(__u32 val)
   9{
  10        asm("bswapl %0" : "=r" (val) : "0" (val));
  11        return val;
  12}
  13#define __arch_swab32 __arch_swab32
  14
  15static inline __attribute_const__ __u64 __arch_swab64(__u64 val)
  16{
  17#ifdef __i386__
  18        union {
  19                struct {
  20                        __u32 a;
  21                        __u32 b;
  22                } s;
  23                __u64 u;
  24        } v;
  25        v.u = val;
  26        asm("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
  27            : "=r" (v.s.a), "=r" (v.s.b)
  28            : "0" (v.s.a), "1" (v.s.b));
  29        return v.u;
  30#else /* __i386__ */
  31        asm("bswapq %0" : "=r" (val) : "0" (val));
  32        return val;
  33#endif
  34}
  35#define __arch_swab64 __arch_swab64
  36
  37#endif /* _ASM_X86_SWAB_H */
  38