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) : "" (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 : "" (v.s.a), "1" (v.s.b));
29 return v.u;
30 #else /* __i386__ */
31 asm("bswapq %0" : "=r" (val) : "" (val));
32 return val;
33 #endif
34 }
35 #define __arch_swab64 __arch_swab64
36
37 #endif /* _ASM_X86_SWAB_H */
38
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