/*
* Copyright (c) 2005 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* 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 kernel_generic
* @ingroup others
* @{
*/
/**
* @file
* @brief Macros for making values and addresses aligned.
*/
#ifndef KERN_ALIGN_H_
#define KERN_ALIGN_H_
#ifdef __ASSEMBLER__
#define ALIGN_DOWN(s, a) ((s) & ~((a) - 1))
#define ALIGN_UP(s, a) (((s) + ((a) - 1)) & ~((a) - 1))
#else
/** Align to the nearest lower address.
*
* @param s Address or size to be aligned.
* @param a Size of alignment, must be a power of 2.
*/
#define ALIGN_DOWN(s, a) ((s) & ~((typeof(s))(a) - 1))
/** Align to the nearest higher address.
*
* @param s Address or size to be aligned.
* @param a Size of alignment, must be a power of 2.
*/
#define ALIGN_UP(s, a) (((s) + ((a) - 1)) & ~((typeof(s))(a) - 1))
#endif
/** Check alignment.
*
* @param s Address or size to be checked for alignment.
* @param a Size of alignment, must be a power of 2.
*/
#define IS_ALIGNED(s, a) (ALIGN_UP((s), (a)) == (s))
#endif
/** @}
*/