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1da177e4 LT |
1 | #ifndef _I386_BYTEORDER_H |
2 | #define _I386_BYTEORDER_H | |
3 | ||
4 | #include <asm/types.h> | |
5 | #include <linux/compiler.h> | |
6 | ||
7 | #ifdef __GNUC__ | |
8 | ||
9 | /* For avoiding bswap on i386 */ | |
10 | #ifdef __KERNEL__ | |
11 | #include <linux/config.h> | |
12 | #endif | |
13 | ||
14 | static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x) | |
15 | { | |
16 | #ifdef CONFIG_X86_BSWAP | |
17 | __asm__("bswap %0" : "=r" (x) : "0" (x)); | |
18 | #else | |
19 | __asm__("xchgb %b0,%h0\n\t" /* swap lower bytes */ | |
20 | "rorl $16,%0\n\t" /* swap words */ | |
21 | "xchgb %b0,%h0" /* swap higher bytes */ | |
22 | :"=q" (x) | |
23 | : "0" (x)); | |
24 | #endif | |
25 | return x; | |
26 | } | |
27 | ||
28 | static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 val) | |
29 | { | |
30 | union { | |
31 | struct { __u32 a,b; } s; | |
32 | __u64 u; | |
33 | } v; | |
34 | v.u = val; | |
35 | #ifdef CONFIG_X86_BSWAP | |
36 | asm("bswapl %0 ; bswapl %1 ; xchgl %0,%1" | |
37 | : "=r" (v.s.a), "=r" (v.s.b) | |
38 | : "0" (v.s.a), "1" (v.s.b)); | |
39 | #else | |
40 | v.s.a = ___arch__swab32(v.s.a); | |
41 | v.s.b = ___arch__swab32(v.s.b); | |
42 | asm("xchgl %0,%1" : "=r" (v.s.a), "=r" (v.s.b) : "0" (v.s.a), "1" (v.s.b)); | |
43 | #endif | |
44 | return v.u; | |
45 | } | |
46 | ||
47 | /* Do not define swab16. Gcc is smart enough to recognize "C" version and | |
48 | convert it into rotation or exhange. */ | |
49 | ||
50 | #define __arch__swab64(x) ___arch__swab64(x) | |
51 | #define __arch__swab32(x) ___arch__swab32(x) | |
52 | ||
53 | #define __BYTEORDER_HAS_U64__ | |
54 | ||
55 | #endif /* __GNUC__ */ | |
56 | ||
57 | #include <linux/byteorder/little_endian.h> | |
58 | ||
59 | #endif /* _I386_BYTEORDER_H */ |