xref: /titanic_52/usr/src/boot/sys/x86/include/_align.h (revision 4a5d661a82b942b6538acd26209d959ce98b593a)
1*4a5d661aSToomas Soome /*-
2*4a5d661aSToomas Soome  * Copyright (c) 2001 David E. O'Brien
3*4a5d661aSToomas Soome  * Copyright (c) 1990 The Regents of the University of California.
4*4a5d661aSToomas Soome  * All rights reserved.
5*4a5d661aSToomas Soome  *
6*4a5d661aSToomas Soome  * This code is derived from software contributed to Berkeley by
7*4a5d661aSToomas Soome  * William Jolitz.
8*4a5d661aSToomas Soome  *
9*4a5d661aSToomas Soome  * Redistribution and use in source and binary forms, with or without
10*4a5d661aSToomas Soome  * modification, are permitted provided that the following conditions
11*4a5d661aSToomas Soome  * are met:
12*4a5d661aSToomas Soome  * 1. Redistributions of source code must retain the above copyright
13*4a5d661aSToomas Soome  *    notice, this list of conditions and the following disclaimer.
14*4a5d661aSToomas Soome  * 2. Redistributions in binary form must reproduce the above copyright
15*4a5d661aSToomas Soome  *    notice, this list of conditions and the following disclaimer in the
16*4a5d661aSToomas Soome  *    documentation and/or other materials provided with the distribution.
17*4a5d661aSToomas Soome  * 3. All advertising materials mentioning features or use of this software
18*4a5d661aSToomas Soome  *    must display the following acknowledgement:
19*4a5d661aSToomas Soome  *	This product includes software developed by the University of
20*4a5d661aSToomas Soome  *	California, Berkeley and its contributors.
21*4a5d661aSToomas Soome  * 4. Neither the name of the University nor the names of its contributors
22*4a5d661aSToomas Soome  *    may be used to endorse or promote products derived from this software
23*4a5d661aSToomas Soome  *    without specific prior written permission.
24*4a5d661aSToomas Soome  *
25*4a5d661aSToomas Soome  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26*4a5d661aSToomas Soome  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27*4a5d661aSToomas Soome  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28*4a5d661aSToomas Soome  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29*4a5d661aSToomas Soome  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30*4a5d661aSToomas Soome  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31*4a5d661aSToomas Soome  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32*4a5d661aSToomas Soome  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33*4a5d661aSToomas Soome  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34*4a5d661aSToomas Soome  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35*4a5d661aSToomas Soome  * SUCH DAMAGE.
36*4a5d661aSToomas Soome  *
37*4a5d661aSToomas Soome  *	from: @(#)param.h	5.8 (Berkeley) 6/28/91
38*4a5d661aSToomas Soome  * $FreeBSD$
39*4a5d661aSToomas Soome  */
40*4a5d661aSToomas Soome 
41*4a5d661aSToomas Soome #ifndef _X86_INCLUDE__ALIGN_H_
42*4a5d661aSToomas Soome #define	_X86_INCLUDE__ALIGN_H_
43*4a5d661aSToomas Soome 
44*4a5d661aSToomas Soome /*
45*4a5d661aSToomas Soome  * Round p (pointer or byte index) up to a correctly-aligned value
46*4a5d661aSToomas Soome  * for all data types (int, long, ...).   The result is unsigned int
47*4a5d661aSToomas Soome  * and must be cast to any desired pointer type.
48*4a5d661aSToomas Soome  */
49*4a5d661aSToomas Soome #define	_ALIGNBYTES	(sizeof(register_t) - 1)
50*4a5d661aSToomas Soome #define	_ALIGN(p)	(((uintptr_t)(p) + _ALIGNBYTES) & ~_ALIGNBYTES)
51*4a5d661aSToomas Soome 
52*4a5d661aSToomas Soome #endif /* !_X86_INCLUDE__ALIGN_H_ */
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