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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-i386/unaligned.h | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'include/asm-i386/unaligned.h')
-rw-r--r-- | include/asm-i386/unaligned.h | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/include/asm-i386/unaligned.h b/include/asm-i386/unaligned.h new file mode 100644 index 0000000..7acd795 --- /dev/null +++ b/include/asm-i386/unaligned.h @@ -0,0 +1,37 @@ +#ifndef __I386_UNALIGNED_H +#define __I386_UNALIGNED_H + +/* + * The i386 can do unaligned accesses itself. + * + * The strange macros are there to make sure these can't + * be misused in a way that makes them not work on other + * architectures where unaligned accesses aren't as simple. + */ + +/** + * get_unaligned - get value from possibly mis-aligned location + * @ptr: pointer to value + * + * This macro should be used for accessing values larger in size than + * single bytes at locations that are expected to be improperly aligned, + * e.g. retrieving a u16 value from a location not u16-aligned. + * + * Note that unaligned accesses can be very expensive on some architectures. + */ +#define get_unaligned(ptr) (*(ptr)) + +/** + * put_unaligned - put value to a possibly mis-aligned location + * @val: value to place + * @ptr: pointer to location + * + * This macro should be used for placing values larger in size than + * single bytes at locations that are expected to be improperly aligned, + * e.g. writing a u16 value to a location not u16-aligned. + * + * Note that unaligned accesses can be very expensive on some architectures. + */ +#define put_unaligned(val, ptr) ((void)( *(ptr) = (val) )) + +#endif |