38 строки
1.2 KiB
C
38 строки
1.2 KiB
C
#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
|