1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright 2018-2020 Alex Richardson <arichardson@FreeBSD.org>
5 *
6 * This software was developed by SRI International and the University of
7 * Cambridge Computer Laboratory (Department of Computer Science and
8 * Technology) under DARPA contract HR0011-18-C-0016 ("ECATS"), as part of the
9 * DARPA SSITH research programme.
10 *
11 * This software was developed by SRI International and the University of
12 * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
13 * ("CTSRD"), as part of the DARPA CRASH research programme.
14 *
15 * This work was supported by Innovate UK project 105694, "Digital Security by
16 * Design (DSbD) Technology Platform Prototype".
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions
20 * are met:
21 * 1. Redistributions of source code must retain the above copyright
22 *    notice, this list of conditions and the following disclaimer.
23 * 2. Redistributions in binary form must reproduce the above copyright
24 *    notice, this list of conditions and the following disclaimer in the
25 *    documentation and/or other materials provided with the distribution.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 */
39#pragma once
40
41#include_next <sys/param.h>
42
43#ifndef BLKDEV_IOSIZE
44#define BLKDEV_IOSIZE PAGE_SIZE /* default block device I/O size */
45#endif
46#ifndef DFLTPHYS
47#define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */
48#endif
49#ifndef MAXPHYS
50#define MAXPHYS (128 * 1024) /* max raw I/O transfer size */
51#endif
52#ifndef MAXDUMPPGS
53#define MAXDUMPPGS (DFLTPHYS / PAGE_SIZE)
54#endif
55
56#ifndef MCLSHIFT
57#define MCLSHIFT 11 /* convert bytes to mbuf clusters */
58#endif
59
60#ifndef MCLBYTES
61#define MCLBYTES (1 << MCLSHIFT) /* size of an mbuf cluster */
62#endif
63
64#ifndef __PAST_END
65#define __PAST_END(array, offset) (((__typeof__(*(array)) *)(array))[offset])
66#endif
67
68#ifndef nitems
69// https://stackoverflow.com/questions/1598773/is-there-a-standard-function-in-c-that-would-return-the-length-of-an-array/1598827#1598827
70#define nitems(x) \
71	((sizeof(x) / sizeof(0 [x])) / ((size_t)(!(sizeof(x) % sizeof(0 [x])))))
72#endif
73
74#ifndef rounddown
75#define rounddown(x, y) (((x) / (y)) * (y))
76#endif
77#ifndef rounddown2
78#define rounddown2(x, y) ((x) & (~((y)-1))) /* if y is power of two */
79#endif
80#ifndef roundup
81#define roundup(x, y) ((((x) + ((y)-1)) / (y)) * (y)) /* to any y */
82#endif
83#ifndef roundup2
84#define roundup2(x, y) \
85	(((x) + ((y)-1)) & (~((y)-1))) /* if y is powers of two */
86#endif
87#ifndef powerof2
88#define powerof2(x) ((((x)-1) & (x)) == 0)
89#endif
90