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
   8 static 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
  15 static 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 */