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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | #ifndef __I386_UNALIGNED_H |
| 2 | #define __I386_UNALIGNED_H |
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| 3 | |||
| 4 | /* |
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| 5 | * The i386 can do unaligned accesses itself. |
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| 6 | * |
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| 7 | * The strange macros are there to make sure these can't |
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| 8 | * be misused in a way that makes them not work on other |
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| 9 | * architectures where unaligned accesses aren't as simple. |
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| 10 | */ |
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| 11 | |||
| 12 | /** |
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| 13 | * get_unaligned - get value from possibly mis-aligned location |
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| 14 | * @ptr: pointer to value |
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| 15 | * |
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| 16 | * This macro should be used for accessing values larger in size than |
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| 17 | * single bytes at locations that are expected to be improperly aligned, |
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| 18 | * e.g. retrieving a u16 value from a location not u16-aligned. |
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| 19 | * |
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| 20 | * Note that unaligned accesses can be very expensive on some architectures. |
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| 21 | */ |
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| 22 | #define get_unaligned(ptr) (*(ptr)) |
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| 23 | |||
| 24 | /** |
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| 25 | * put_unaligned - put value to a possibly mis-aligned location |
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| 26 | * @val: value to place |
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| 27 | * @ptr: pointer to location |
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| 28 | * |
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| 29 | * This macro should be used for placing values larger in size than |
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| 30 | * single bytes at locations that are expected to be improperly aligned, |
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| 31 | * e.g. writing a u16 value to a location not u16-aligned. |
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| 32 | * |
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| 33 | * Note that unaligned accesses can be very expensive on some architectures. |
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| 34 | */ |
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| 35 | #define put_unaligned(val, ptr) ((void)( *(ptr) = (val) )) |
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| 36 | |||
| 37 | #endif |