91 lines
2.7 KiB
C
91 lines
2.7 KiB
C
/* util.h - misc utilities */
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/*
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* Copyright (c) 2011-2014, Wind River Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3) Neither the name of Wind River Systems nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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DESCRIPTION
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Misc utilities usable by nanokernel, microkernel, and application code.
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*/
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#ifndef _UTIL__H_
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#define _UTIL__H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define ARRAY_SIZE(array) (sizeof(array) / sizeof((array)[0]))
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#define CONTAINER_OF(ptr, type, field) \
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((type *)(((char *)(ptr)) - offsetof(type, field)))
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#ifndef _ASMLANGUAGE
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/* round "x" up/down to next multiple of "align" (which must be a power of 2) */
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#define ROUND_UP(x, align) \
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(((unsigned long)(x) + ((unsigned long)align - 1)) & \
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~((unsigned long)align - 1))
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#define ROUND_DOWN(x, align) ((unsigned long)(x) & ~((unsigned long)align - 1))
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#ifdef INLINED
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#define INLINE inline
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#else
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#define INLINE
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#endif
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#ifndef max
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#define max(a, b) (((a) > (b)) ? (a) : (b))
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#endif
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#ifndef min
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#define min(a, b) (((a) < (b)) ? (a) : (b))
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#endif
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static inline int _IsPowerOfTwo(unsigned int x)
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{
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return (x != 0) && !(x & (x - 1));
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}
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#endif /* !_ASMLANGUAGE */
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/* KB, MB, GB */
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#define KB(x) ((x) << 10)
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#define MB(x) (KB(x) << 10)
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#define GB(x) (MB(x) << 10)
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/* KHZ, MHZ */
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#define KHZ(x) ((x) * 1000)
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#define MHZ(x) (KHZ(x) * 1000)
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#ifdef __cplusplus
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}
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#endif
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#endif /* _UTIL__H_ */
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