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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | #ifndef _I386_BYTEORDER_H |
| 2 | #define _I386_BYTEORDER_H |
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| 3 | |||
| 4 | #include <asm/types.h> |
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| 5 | |||
| 6 | #ifdef __GNUC__ |
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| 7 | |||
| 8 | /* For avoiding bswap on i386 */ |
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| 9 | #ifdef __KERNEL__ |
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| 10 | #include <linux/config.h> |
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| 11 | #endif |
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| 12 | |||
| 1056 | tullio | 13 | static __inline__ __attribute__((const)) __u32 ___arch__swab32(__u32 x) |
| 422 | giacomo | 14 | { |
| 15 | #ifdef CONFIG_X86_BSWAP |
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| 16 | __asm__("bswap %0" : "=r" (x) : "0" (x)); |
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| 17 | #else |
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| 18 | __asm__("xchgb %b0,%h0\n\t" /* swap lower bytes */ |
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| 19 | "rorl $16,%0\n\t" /* swap words */ |
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| 20 | "xchgb %b0,%h0" /* swap higher bytes */ |
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| 21 | :"=q" (x) |
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| 22 | : "0" (x)); |
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| 23 | #endif |
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| 24 | return x; |
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| 25 | } |
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| 26 | |||
| 27 | /* gcc should generate this for open coded C now too. May be worth switching to |
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| 28 | it because inline assembly cannot be scheduled. -AK */ |
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| 1056 | tullio | 29 | static __inline__ __attribute__((const)) __u16 ___arch__swab16(__u16 x) |
| 422 | giacomo | 30 | { |
| 31 | __asm__("xchgb %b0,%h0" /* swap bytes */ |
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| 32 | : "=q" (x) |
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| 33 | : "0" (x)); |
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| 34 | return x; |
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| 35 | } |
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| 36 | |||
| 37 | |||
| 38 | static inline __u64 ___arch__swab64(__u64 val) |
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| 39 | { |
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| 40 | union { |
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| 41 | struct { __u32 a,b; } s; |
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| 42 | __u64 u; |
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| 43 | } v; |
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| 44 | v.u = val; |
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| 45 | #ifdef CONFIG_X86_BSWAP |
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| 46 | asm("bswapl %0 ; bswapl %1 ; xchgl %0,%1" |
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| 47 | : "=r" (v.s.a), "=r" (v.s.b) |
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| 48 | : "0" (v.s.a), "1" (v.s.b)); |
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| 49 | #else |
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| 50 | v.s.a = ___arch__swab32(v.s.a); |
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| 51 | v.s.b = ___arch__swab32(v.s.b); |
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| 52 | asm("xchgl %0,%1" : "=r" (v.s.a), "=r" (v.s.b) : "0" (v.s.a), "1" (v.s.b)); |
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| 53 | #endif |
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| 54 | return v.u; |
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| 55 | } |
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| 56 | |||
| 57 | #define __arch__swab64(x) ___arch__swab64(x) |
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| 58 | #define __arch__swab32(x) ___arch__swab32(x) |
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| 59 | #define __arch__swab16(x) ___arch__swab16(x) |
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| 60 | |||
| 61 | #define __BYTEORDER_HAS_U64__ |
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| 62 | |||
| 63 | #endif /* __GNUC__ */ |
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| 64 | |||
| 65 | #include <linux/byteorder/little_endian.h> |
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| 66 | |||
| 67 | #endif /* _I386_BYTEORDER_H */ |