WebSVN – HelenOS – Diff – /branches/dd/kernel/generic/include/align.h



 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/** @addtogroup generic
 * @ingroup others
 * @{
 */
/**
 * @file
 * @brief Macros for making values and addresses aligned.
 */
 
#ifndef KERN_ALIGN_H_
#define KERN_ALIGN_H_
 
/** Align to the nearest lower address.
 *
 * @param s Address or size to be aligned.
 * @param a Size of alignment, must be power of 2.
 */
#define ALIGN_DOWN(s, a)  ((s) & ~((a) - 1))
 
 
/** Align to the nearest higher address.
 *
 * @param s Address or size to be aligned.
 * @param a Size of alignment, must be power of 2.
 */
#define ALIGN_UP(s, a)  (((s) + ((a) - 1)) & ~((a) - 1))
 
#endif
 
/** @}
 */

Subversion Repositories HelenOS

(root)/branches/dd/kernel/generic/include/align.h – Rev 3022 → 4055

Rev 3022		Rev 4055
Line 24...		Line 24...
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/** @addtogroup generic	29	/** @addtogroup generic
30	* @ingroup others	30	* @ingroup others
31	* @{	31	* @{
32	*/	32	*/
33	/**	33	/**
34	* @file	34	* @file
35	* @brief Macros for making values and addresses aligned.	35	* @brief Macros for making values and addresses aligned.
36	*/	36	*/
37		37
38	#ifndef KERN_ALIGN_H_	38	#ifndef KERN_ALIGN_H_
39	#define KERN_ALIGN_H_	39	#define KERN_ALIGN_H_
40		40
41	/** Align to the nearest lower address.	41	/** Align to the nearest lower address.
42	*	42	*
43	* @param s Address or size to be aligned.	43	* @param s Address or size to be aligned.
44	* @param a Size of alignment, must be power of 2.	44	* @param a Size of alignment, must be power of 2.
45	*/	45	*/
46	#define ALIGN_DOWN(s, a) ((s) & ~((a) - 1))	46	#define ALIGN_DOWN(s, a) ((s) & ~((a) - 1))
47		47
48		48
49	/** Align to the nearest higher address.	49	/** Align to the nearest higher address.
50	*	50	*
51	* @param s Address or size to be aligned.	51	* @param s Address or size to be aligned.
52	* @param a Size of alignment, must be power of 2.	52	* @param a Size of alignment, must be power of 2.
53	*/	53	*/
54	#define ALIGN_UP(s, a) (((s) + ((a) - 1)) & ~((a) - 1))	54	#define ALIGN_UP(s, a) (((s) + ((a) - 1)) & ~((a) - 1))
55		55
56	#endif	56	#endif
57		57
58	/** @}	58	/** @}
59	*/	59	*/