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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef __X8664_UNALIGNED_H
2#define __X8664_UNALIGNED_H
3
4/*
5 * The x86-64 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