The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/assym.h

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    1 /*-
    2  * Copyright (c) 1999 Marcel Moolenaar
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer 
   10  *    in this position and unchanged.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   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
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  *
   28  * $FreeBSD: src/sys/sys/assym.h,v 1.4 2000/06/02 09:27:48 bde Exp $
   29  */
   30 
   31 #ifndef _SYS_ASSYM_H_
   32 #define _SYS_ASSYM_H_
   33 
   34 #define ASSYM_ABS(value)        ((value) < 0 ? -((value) + 1) + 1ULL : (value))
   35 
   36 #define ASSYM(name, value)                                      \
   37 char name ## sign[(value) < 0 ? 1 : 0];                         \
   38 char name ## w0[ASSYM_ABS(value) & 0xFFFFU];                    \
   39 char name ## w1[(ASSYM_ABS(value) & 0xFFFF0000UL) >> 16];       \
   40 char name ## w2[(ASSYM_ABS(value) & 0xFFFF00000000ULL) >> 32];  \
   41 char name ## w3[(ASSYM_ABS(value) & 0xFFFF000000000000ULL) >> 48]
   42 
   43 #endif /* !_SYS_ASSYM_H_ */

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