include/kernel/align.h

0001 /*
0002  * Copyright (c) 2005 Jakub Jermar
0003  * All rights reserved.
0004  *
0005  * Redistribution and use in source and binary forms, with or without
0006  * modification, are permitted provided that the following conditions
0007  * are met:
0008  *
0009  * - Redistributions of source code must retain the above copyright
0010  *   notice, this list of conditions and the following disclaimer.
0011  * - Redistributions in binary form must reproduce the above copyright
0012  *   notice, this list of conditions and the following disclaimer in the
0013  *   documentation and/or other materials provided with the distribution.
0014  * - The name of the author may not be used to endorse or promote products
0015  *   derived from this software without specific prior written permission.
0016  *
0017  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
0018  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
0019  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
0020  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
0021  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
0022  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
0023  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
0024  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
0025  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
0026  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
0027  */
0028
0029 /** @addtogroup RTEMSBSPsSPARC64Generic
0030  * @ingroup others
0031  * @{
0032  */
0033 /**
0034  * @file
0035  * @brief Macros for making values and addresses aligned.
0036  */
0037
0038 #ifndef KERN_ALIGN_H_
0039 #define KERN_ALIGN_H_
0040
0041 /** Align to the nearest lower address.
0042  *
0043  * @param s Address or size to be aligned.
0044  * @param a Size of alignment, must be power of 2.
0045  */
0046 #define ALIGN_DOWN(s, a)  ((s) & ~((a) - 1))
0047
0048
0049 /** Align to the nearest higher address.
0050  *
0051  * @param s Address or size to be aligned.
0052  * @param a Size of alignment, must be power of 2.
0053  */
0054 #define ALIGN_UP(s, a)  (((s) + ((a) - 1)) & ~((a) - 1))
0055
0056 #endif
0057
0058 /** @}
0059  */