1 /* $OpenBSD: param.c,v 1.27 2007/05/31 05:12:41 pedro 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/socket.h>
43 #include <sys/proc.h>
44 #include <sys/vnode.h>
45 #include <sys/file.h>
46 #include <sys/timeout.h>
47 #include <sys/mbuf.h>
48 #include <ufs/ufs/quota.h>
49 #include <sys/kernel.h>
50 #include <sys/utsname.h>
51 #ifdef SYSVSHM
52 #include <machine/vmparam.h>
53 #include <sys/shm.h>
54 #endif
55 #ifdef SYSVSEM
56 #include <sys/sem.h>
57 #endif
58 #ifdef SYSVMSG
59 #include <sys/msg.h>
60 #endif
61
62 /*
63 * System parameter formulae.
64 *
65 * This file is copied into each directory where we compile
66 * the kernel; it should be modified there to suit local taste
67 * if necessary.
68 *
69 * Compiled with -DHZ=xx -DTIMEZONE=x -DDST=x -DMAXUSERS=xx
70 */
71
72 #ifndef TIMEZONE
73 # define TIMEZONE 0
74 #endif
75 #ifndef DST
76 # define DST 0
77 #endif
78 #ifndef HZ
79 #define HZ 100
80 #endif
81 int hz = HZ;
82 int tick = 1000000 / HZ;
83 int tickadj = 240000 / (60 * HZ); /* can adjust 240ms in 60s */
84 struct timezone tz = { TIMEZONE, DST };
85 #define NPROC (20 + 16 * MAXUSERS)
86 #define NTEXT (80 + NPROC / 8) /* actually the object cache */
87 #define NVNODE (NPROC * 2 + NTEXT + 100)
88 int desiredvnodes = NVNODE;
89 int maxproc = NPROC;
90 int maxfiles = 3 * (NPROC + MAXUSERS) + 80;
91 int nmbclust = NMBCLUSTERS;
92
93 #ifndef MBLOWAT
94 #define MBLOWAT 16
95 #endif
96 int mblowat = MBLOWAT;
97
98 #ifndef MCLLOWAT
99 #define MCLLOWAT 8
100 #endif
101 int mcllowat = MCLLOWAT;
102
103
104 int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */
105
106 int shmseg = 8;
107 int shmmaxpgs = SHMMAXPGS;
108 /*
109 * Values in support of System V compatible shared memory. XXX
110 */
111 #ifdef SYSVSHM
112 #define SHMMAX SHMMAXPGS /* shminit() performs a `*= PAGE_SIZE' */
113 #define SHMMIN 1
114 #define SHMMNI 128 /* <64k, see IPCID_TO_IX in ipc.h */
115 #define SHMSEG 128
116 #define SHMALL (SHMMAXPGS)
117
118 struct shminfo shminfo = {
119 SHMMAX,
120 SHMMIN,
121 SHMMNI,
122 SHMSEG,
123 SHMALL
124 };
125 #endif
126
127 /*
128 * Values in support of System V compatible semaphores.
129 */
130 #ifdef SYSVSEM
131 struct seminfo seminfo = {
132 SEMMNI, /* # of semaphore identifiers */
133 SEMMNS, /* # of semaphores in system */
134 SEMMNU, /* # of undo structures in system */
135 SEMMSL, /* max # of semaphores per id */
136 SEMOPM, /* max # of operations per semop call */
137 SEMUME, /* max # of undo entries per process */
138 SEMUSZ, /* size in bytes of undo structure */
139 SEMVMX, /* semaphore maximum value */
140 SEMAEM /* adjust on exit max value */
141 };
142 #endif
143
144 /*
145 * Values in support of System V compatible messages.
146 */
147 #ifdef SYSVMSG
148 struct msginfo msginfo = {
149 MSGMAX, /* max chars in a message */
150 MSGMNI, /* # of message queue identifiers */
151 MSGMNB, /* max chars in a queue */
152 MSGTQL, /* max messages in system */
153 MSGSSZ, /* size of a message segment */
154 /* (must be small power of 2 greater than 4) */
155 MSGSEG /* number of message segments */
156 };
157 #endif
158
159 /*
160 * This has to be allocated somewhere; allocating
161 * them here forces loader errors if this file is omitted
162 * (if they've been externed everywhere else; hah!).
163 */
164 struct utsname utsname;