math64.h revision 289569 
1/*-
2 * Copyright (c) 2007 Cisco Systems, Inc.  All rights reserved.
3 * Copyright (c) 2014-2015 Mellanox Technologies, Ltd. All rights reserved.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice unmodified, this list of conditions, and the following
11 *    disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#ifndef _LINUX_MATH64_H
29#define	_LINUX_MATH64_H
30
31#include <sys/stdint.h>
32
33#define	do_div(n, base) ({			\
34	uint32_t __base = (base);		\
35	uint32_t __rem;				\
36	__rem = ((uint64_t)(n)) % __base;	\
37	(n) = ((uint64_t)(n)) / __base;		\
38	__rem;					\
39})
40
41static inline uint64_t
42div_u64_rem(uint64_t dividend, uint32_t divisor, uint32_t *remainder)
43{
44	*remainder = dividend % divisor;
45	return (dividend / divisor);
46}
47
48static inline uint64_t
49div_u64(uint64_t dividend, uint32_t divisor)
50{
51	return (dividend / divisor);
52}
53
54#endif					/* _LINUX_MATH64_H */
55