xref: /freebsd/sys/x86/include/_align.h (revision 29363fb446372cb3f10bc98664e9767c53fbb457)
1ce4ec51dSTijl Coosemans /*-
2*df57947fSPedro F. Giffuni  * SPDX-License-Identifier: BSD-4-Clause
3*df57947fSPedro F. Giffuni  *
4ce4ec51dSTijl Coosemans  * Copyright (c) 2001 David E. O'Brien
5ce4ec51dSTijl Coosemans  * Copyright (c) 1990 The Regents of the University of California.
6ce4ec51dSTijl Coosemans  * All rights reserved.
7ce4ec51dSTijl Coosemans  *
8ce4ec51dSTijl Coosemans  * This code is derived from software contributed to Berkeley by
9ce4ec51dSTijl Coosemans  * William Jolitz.
10ce4ec51dSTijl Coosemans  *
11ce4ec51dSTijl Coosemans  * Redistribution and use in source and binary forms, with or without
12ce4ec51dSTijl Coosemans  * modification, are permitted provided that the following conditions
13ce4ec51dSTijl Coosemans  * are met:
14ce4ec51dSTijl Coosemans  * 1. Redistributions of source code must retain the above copyright
15ce4ec51dSTijl Coosemans  *    notice, this list of conditions and the following disclaimer.
16ce4ec51dSTijl Coosemans  * 2. Redistributions in binary form must reproduce the above copyright
17ce4ec51dSTijl Coosemans  *    notice, this list of conditions and the following disclaimer in the
18ce4ec51dSTijl Coosemans  *    documentation and/or other materials provided with the distribution.
19ce4ec51dSTijl Coosemans  * 3. All advertising materials mentioning features or use of this software
20ce4ec51dSTijl Coosemans  *    must display the following acknowledgement:
21ce4ec51dSTijl Coosemans  *	This product includes software developed by the University of
22ce4ec51dSTijl Coosemans  *	California, Berkeley and its contributors.
23ce4ec51dSTijl Coosemans  * 4. Neither the name of the University nor the names of its contributors
24ce4ec51dSTijl Coosemans  *    may be used to endorse or promote products derived from this software
25ce4ec51dSTijl Coosemans  *    without specific prior written permission.
26ce4ec51dSTijl Coosemans  *
27ce4ec51dSTijl Coosemans  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28ce4ec51dSTijl Coosemans  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29ce4ec51dSTijl Coosemans  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30ce4ec51dSTijl Coosemans  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31ce4ec51dSTijl Coosemans  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32ce4ec51dSTijl Coosemans  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33ce4ec51dSTijl Coosemans  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34ce4ec51dSTijl Coosemans  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35ce4ec51dSTijl Coosemans  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36ce4ec51dSTijl Coosemans  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37ce4ec51dSTijl Coosemans  * SUCH DAMAGE.
38ce4ec51dSTijl Coosemans  */
39ce4ec51dSTijl Coosemans 
40ce4ec51dSTijl Coosemans #ifndef _X86_INCLUDE__ALIGN_H_
41ce4ec51dSTijl Coosemans #define	_X86_INCLUDE__ALIGN_H_
42ce4ec51dSTijl Coosemans 
43ce4ec51dSTijl Coosemans /*
44ce4ec51dSTijl Coosemans  * Round p (pointer or byte index) up to a correctly-aligned value
45ce4ec51dSTijl Coosemans  * for all data types (int, long, ...).   The result is unsigned int
46ce4ec51dSTijl Coosemans  * and must be cast to any desired pointer type.
47ce4ec51dSTijl Coosemans  */
483a45c3d6SEd Schouten #define	_ALIGNBYTES	(sizeof(__register_t) - 1)
493a45c3d6SEd Schouten #define	_ALIGN(p)	(((__uintptr_t)(p) + _ALIGNBYTES) & ~_ALIGNBYTES)
50ce4ec51dSTijl Coosemans 
51ce4ec51dSTijl Coosemans #endif /* !_X86_INCLUDE__ALIGN_H_ */
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