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001 /* Copyright (C) 2004 The KOS Team 002 003 This program is free software; you can redistribute it and/or 004 modify it under the terms of the GNU General Public License 005 as published by the Free Software Foundation; either version 2 006 of the License, or (at your option) any later version. 007 008 This program is distributed in the hope that it will be useful, 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 011 GNU General Public License for more details. 012 013 You should have received a copy of the GNU General Public License 014 along with this program; if not, write to the Free Software 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 016 USA. 017 */ 018 #ifndef _SOS_MACROS_H_ 019 #define _SOS_MACROS_H_ 020 021 /** Align on a boundary (MUST be a power of 2), so that return value <= val */ 022 #define SOS_ALIGN_INF(val,boundary) \ 023 (((unsigned)(val)) & (~((boundary)-1))) 024 025 /** Align on a boundary (MUST be a power of 2), so that return value >= val */ 026 #define SOS_ALIGN_SUP(val,boundary) \ 027 ({ unsigned int __bnd=(boundary); \ 028 (((((unsigned)(val))-1) & (~(__bnd - 1))) + __bnd); }) 029 030 /** Check whether val is aligned on a boundary (MUST be a power of 2) */ 031 #define SOS_IS_ALIGNED(val,boundary) \ 032 ( 0 == (((unsigned)(val)) & ((boundary)-1)) ) 033 034 /** 035 * @return TRUE if val is a power of 2. 036 * @note val is evaluated multiple times 037 */ 038 #define SOS_IS_POWER_OF_2(val) \ 039 ((((val) - 1) & (val)) == 0) 040 041 /** 042 * Standard macro to get the offset of the given field in a structure 043 */ 044 #define offsetof(type,field) \ 045 ((unsigned) &(((type *)0)->field)) 046 047 #endif /* _SOS_MACROS_H_ */
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