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1/* $OpenBSD: param.c,v 1.53 2025/08/06 14:00:33 mvs Exp $ */
2/* $NetBSD: param.c,v 1.16 1996/03/12 03:08:40 mrg Exp $ */
3
4/*
5 * Copyright (c) 1980, 1986, 1989 Regents of the University of California.
6 * All rights reserved.
7 * (c) UNIX System Laboratories, Inc.
8 * All or some portions of this file are derived from material licensed
9 * to the University of California by American Telephone and Telegraph
10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
11 * the permission of UNIX System Laboratories, Inc.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 * @(#)param.c 7.20 (Berkeley) 6/27/91
38 */
39
40#include <sys/param.h>
41#include <sys/systm.h>
42#include <sys/kernel.h>
43#include <sys/utsname.h>
44#ifdef SYSVSHM
45#include <machine/vmparam.h>
46#include <sys/shm.h>
47#endif
48#ifdef SYSVSEM
49#include <sys/sem.h>
50#endif
51
52/*
53 * Locks used to protect data:
54 * a atomic
55 */
56
57/*
58 * System parameter formulae.
59 *
60 * This file is copied into each directory where we compile
61 * the kernel; it should be modified there to suit local taste
62 * if necessary.
63 *
64 * Compiled with -DHZ=xx -DMAXUSERS=xx
65 */
66
67int hz = HZ;
68int tick = 1000000 / HZ;
69int tick_nsec = 1000000000 / HZ;
70int utc_offset = 0;
71#define NPROCESS (30 + 16 * MAXUSERS)
72#define NTEXT (80 + NPROCESS / 8) /* actually the object cache */
73#define NVNODE (NPROCESS * 2 + NTEXT + 100)
74int initialvnodes = NVNODE;
75int maxprocess = NPROCESS; /* [a] */
76int maxthread = 2 * NPROCESS; /* [a] */
77int maxfiles = 5 * (NPROCESS + MAXUSERS) + 80; /* [a] */
78long nmbclust = NMBCLUSTERS; /* [a] */
79
80#ifndef BUFCACHEPERCENT
81#define BUFCACHEPERCENT 20
82#endif
83int bufcachepercent = BUFCACHEPERCENT;
84
85#ifndef BUFPAGES
86#define BUFPAGES 0
87#endif
88long bufpages = BUFPAGES;
89
90int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */
91
92/*
93 * Values in support of System V compatible shared memory. XXX
94 */
95#ifdef SYSVSHM
96#define SHMMAX SHMMAXPGS /* shminit() performs a `*= PAGE_SIZE' */
97#define SHMMIN 1
98#define SHMMNI 128 /* <64k, see IPCID_TO_IX in ipc.h */
99#define SHMSEG 128
100#define SHMALL (SHMMAXPGS)
101
102struct shminfo shminfo = {
103 SHMMAX,
104 SHMMIN,
105 SHMMNI,
106 SHMSEG,
107 SHMALL
108};
109#endif
110
111/*
112 * Values in support of System V compatible semaphores.
113 */
114#ifdef SYSVSEM
115struct seminfo seminfo = {
116 SEMMNI, /* # of semaphore identifiers */
117 SEMMNS, /* # of semaphores in system */
118 SEMMNU, /* # of undo structures in system */
119 SEMMSL, /* max # of semaphores per id */
120 SEMOPM, /* max # of operations per semop call */
121 SEMUME, /* max # of undo entries per process */
122 SEMUSZ, /* size in bytes of undo structure */
123 SEMVMX, /* semaphore maximum value */
124 SEMAEM /* adjust on exit max value */
125};
126#endif
127
128/*
129 * This has to be allocated somewhere; allocating
130 * them here forces loader errors if this file is omitted
131 * (if they've been externed everywhere else; hah!).
132 */
133struct utsname utsname;