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 */ 38
