[linux.git] / include / asm-i386 / unaligned.h

#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
Commit	Line	Data
1da177e4 LT	1	#ifndef __I386_UNALIGNED_H
	2	#define __I386_UNALIGNED_H
	3
	4	/*
	5	* The i386 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