| Thomas Gleixner | 003a46c | 2007-10-15 13:57:47 +0200 | [diff] [blame] | 1 | #ifndef _ASM_X86_UNALIGNED_H |
| 2 | #define _ASM_X86_UNALIGNED_H |
| 3 | |
| 4 | /* |
| 5 | * The x86 can do unaligned accesses itself. |
| 6 | * |
| 7 | * The strange macros are there to make sure these can't |
| 8 | * be misused in a way that makes them not work on other |
| 9 | * architectures where unaligned accesses aren't as simple. |
| 10 | */ |
| 11 | |
| 12 | /** |
| 13 | * get_unaligned - get value from possibly mis-aligned location |
| 14 | * @ptr: pointer to value |
| 15 | * |
| 16 | * This macro should be used for accessing values larger in size than |
| 17 | * single bytes at locations that are expected to be improperly aligned, |
| 18 | * e.g. retrieving a u16 value from a location not u16-aligned. |
| 19 | * |
| 20 | * Note that unaligned accesses can be very expensive on some architectures. |
| 21 | */ |
| 22 | #define get_unaligned(ptr) (*(ptr)) |
| 23 | |
| 24 | /** |
| 25 | * put_unaligned - put value to a possibly mis-aligned location |
| 26 | * @val: value to place |
| 27 | * @ptr: pointer to location |
| 28 | * |
| 29 | * This macro should be used for placing values larger in size than |
| 30 | * single bytes at locations that are expected to be improperly aligned, |
| 31 | * e.g. writing a u16 value to a location not u16-aligned. |
| 32 | * |
| 33 | * Note that unaligned accesses can be very expensive on some architectures. |
| 34 | */ |
| 35 | #define put_unaligned(val, ptr) ((void)( *(ptr) = (val) )) |
| 36 | |
| 37 | #endif /* _ASM_X86_UNALIGNED_H */ |