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5d30a683 HH |
1 | #ifndef _ASM_X86_SWAB_H |
2 | #define _ASM_X86_SWAB_H | |
3 | ||
7cff3608 | 4 | #include <linux/types.h> |
5d30a683 HH |
5 | #include <linux/compiler.h> |
6 | ||
7 | static inline __attribute_const__ __u32 __arch_swab32(__u32 val) | |
8 | { | |
9 | #ifdef __i386__ | |
10 | # ifdef CONFIG_X86_BSWAP | |
11 | asm("bswap %0" : "=r" (val) : "0" (val)); | |
12 | # else | |
13 | asm("xchgb %b0,%h0\n\t" /* swap lower bytes */ | |
14 | "rorl $16,%0\n\t" /* swap words */ | |
15 | "xchgb %b0,%h0" /* swap higher bytes */ | |
16 | : "=q" (val) | |
17 | : "0" (val)); | |
18 | # endif | |
19 | ||
20 | #else /* __i386__ */ | |
21 | asm("bswapl %0" | |
22 | : "=r" (val) | |
23 | : "0" (val)); | |
24 | #endif | |
25 | return val; | |
26 | } | |
27 | #define __arch_swab32 __arch_swab32 | |
28 | ||
29 | static inline __attribute_const__ __u64 __arch_swab64(__u64 val) | |
30 | { | |
31 | #ifdef __i386__ | |
32 | union { | |
33 | struct { | |
34 | __u32 a; | |
35 | __u32 b; | |
36 | } s; | |
37 | __u64 u; | |
38 | } v; | |
39 | v.u = val; | |
40 | # ifdef CONFIG_X86_BSWAP | |
41 | asm("bswapl %0 ; bswapl %1 ; xchgl %0,%1" | |
42 | : "=r" (v.s.a), "=r" (v.s.b) | |
43 | : "0" (v.s.a), "1" (v.s.b)); | |
44 | # else | |
45 | v.s.a = __arch_swab32(v.s.a); | |
46 | v.s.b = __arch_swab32(v.s.b); | |
47 | asm("xchgl %0,%1" | |
48 | : "=r" (v.s.a), "=r" (v.s.b) | |
49 | : "0" (v.s.a), "1" (v.s.b)); | |
50 | # endif | |
51 | return v.u; | |
52 | #else /* __i386__ */ | |
53 | asm("bswapq %0" | |
54 | : "=r" (val) | |
55 | : "0" (val)); | |
56 | return val; | |
57 | #endif | |
58 | } | |
59 | #define __arch_swab64 __arch_swab64 | |
60 | ||
61 | #endif /* _ASM_X86_SWAB_H */ |