FreeBSD/Linux Kernel Cross Reference
sys/conf/param.c
1 /* $NetBSD: param.c,v 1.70 2022/07/23 19:15:29 mrg Exp $ */
2
3 /*
4 * Copyright (c) 1980, 1986, 1989 Regents of the University of California.
5 * All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)param.c 7.20 (Berkeley) 6/27/91
37 */
38
39 #include <sys/cdefs.h>
40 __KERNEL_RCSID(0, "$NetBSD: param.c,v 1.70 2022/07/23 19:15:29 mrg Exp $");
41
42 #ifdef _KERNEL_OPT
43 #include "opt_hz.h"
44 #include "opt_rtc_offset.h"
45 #include "opt_sysv.h"
46 #include "opt_sysvparam.h"
47 #include "opt_multiprocessor.h"
48 #include "opt_maxlwp.h"
49 #endif
50
51 #include <sys/param.h>
52 #include <sys/systm.h>
53 #include <sys/socket.h>
54 #include <sys/socketvar.h>
55 #include <sys/proc.h>
56 #include <sys/vnode.h>
57 #include <sys/file.h>
58 #include <sys/callout.h>
59 #include <sys/mbuf.h>
60 #include <ufs/ufs/quota.h>
61 #include <sys/kernel.h>
62 #include <sys/utsname.h>
63 #include <sys/lwp.h>
64 #ifdef SYSVSHM
65 #include <machine/vmparam.h>
66 #include <sys/shm.h>
67 #endif
68 #ifdef SYSVSEM
69 #include <sys/sem.h>
70 #endif
71 #ifdef SYSVMSG
72 #include <sys/msg.h>
73 #endif
74
75 /*
76 * PCC cannot handle the 80KB string literal.
77 */
78 #if !defined(__PCC__)
79 #define CONFIG_FILE
80 #include "config_file.h"
81 #endif
82
83 /*
84 * System parameter formulae.
85 *
86 * This file is copied into each directory where we compile
87 * the kernel; it should be modified there to suit local taste
88 * if necessary.
89 *
90 * Compiled with -DHZ=xx -DRTC_OFFSET=x -DMAXUSERS=xx
91 */
92
93 #ifdef TIMEZONE
94 #error TIMEZONE is an obsolete kernel option.
95 #endif
96
97 #ifdef DST
98 #error DST is an obsolete kernel option.
99 #endif
100
101 #ifndef RTC_OFFSET
102 #define RTC_OFFSET 0
103 #endif
104
105 #ifndef HZ
106 #define HZ 100
107 #endif
108
109 #ifndef MAXEXEC
110 #define MAXEXEC 16
111 #endif
112
113 int hz = HZ;
114 int tick = 1000000 / HZ;
115 /* can adjust 240ms in 60s */
116 int tickadj = (240000 / (60 * HZ)) ? (240000 / (60 * HZ)) : 1;
117 int rtc_offset = RTC_OFFSET;
118 int maxproc = NPROC;
119 int maxlwp = MAXLWP;
120 int desiredvnodes = NVNODE;
121 u_int maxfiles = MAXFILES;
122 int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */
123 int maxexec = MAXEXEC; /* max number of concurrent exec() calls */
124
125 #ifdef MULTIPROCESSOR
126 u_int maxcpus = MAXCPUS;
127 size_t coherency_unit = COHERENCY_UNIT;
128 #else
129 u_int maxcpus = 1;
130 size_t coherency_unit = ALIGNBYTES + 1;
131 #endif
132
133 /*
134 * Various mbuf-related parameters. These can also be changed at run-time
135 * with sysctl.
136 */
137 int nmbclusters = 0;
138
139 #ifndef MBLOWAT
140 #define MBLOWAT 16
141 #endif
142 int mblowat = MBLOWAT;
143
144 #ifndef MCLLOWAT
145 #define MCLLOWAT 8
146 #endif
147 int mcllowat = MCLLOWAT;
148
149 /*
150 * Actual network mbuf sizes (read-only), for netstat.
151 */
152 const int msize = MSIZE;
153 const int mclbytes = MCLBYTES;
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