subr_param.c revision 6577 
1/*
2 * Copyright (c) 1980, 1986, 1989, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *	This product includes software developed by the University of
21 *	California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 *    may be used to endorse or promote products derived from this software
24 *    without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 *	@(#)param.c	8.2 (Berkeley) 1/21/94
39 * $Id: param.c,v 1.7 1995/02/16 11:29:19 joerg Exp $
40 */
41
42#include <sys/param.h>
43#include <sys/systm.h>
44#include <sys/socket.h>
45#include <sys/proc.h>
46#include <sys/vnode.h>
47#include <sys/file.h>
48#include <sys/callout.h>
49#include <sys/clist.h>
50#include <sys/mbuf.h>
51#include <sys/kernel.h>
52
53#include <ufs/ufs/quota.h>
54
55#ifdef SYSVSHM
56#include <machine/vmparam.h>
57#include <sys/shm.h>
58#endif
59#ifdef SYSVSEM
60#include "sys/sem.h"
61#endif
62#ifdef SYSVMSG
63#include "sys/msg.h"
64#endif
65
66/*
67 * System parameter formulae.
68 *
69 * This file is copied into each directory where we compile
70 * the kernel; it should be modified there to suit local taste
71 * if necessary.
72 *
73 * Compiled with -DHZ=xx -DTIMEZONE=x -DDST=x -DMAXUSERS=xx
74 */
75
76#ifndef HZ
77#define	HZ 100
78#endif
79int	hz = HZ;
80int	tick = 1000000 / HZ;
81int	tickadj = 30000 / (60 * HZ);		/* can adjust 30ms in 60s */
82struct	timezone tz = { TIMEZONE, DST };
83#define	NPROC (20 + 16 * MAXUSERS)
84int	maxproc = NPROC;			/* maximum # of processes */
85int	maxprocperuid = NPROC-1;		/* maximum # of processes per user */
86int	maxfiles = NPROC*2;			/* system wide open files limit */
87int	maxfilesperproc = NPROC*2;			/* system wide open files limit */
88int	ncallout = 16 + NPROC;			/* maximum # of timer events */
89int	nmbclusters = NMBCLUSTERS;
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#ifndef SHMMAX
97#define	SHMMAX	(SHMMAXPGS*NBPG)
98#endif
99#ifndef SHMMIN
100#define	SHMMIN	1
101#endif
102#ifndef SHMMNI
103#define	SHMMNI	32			/* <= SHMMMNI in shm.h */
104#endif
105#ifndef SHMSEG
106#define	SHMSEG	8
107#endif
108#ifndef SHMALL
109#define	SHMALL	(SHMMAXPGS/CLSIZE)
110#endif
111
112struct	shminfo shminfo = {
113	SHMMAX,
114	SHMMIN,
115	SHMMNI,
116	SHMSEG,
117	SHMALL
118};
119#endif
120
121/*
122 * Values in support of System V compatible semaphores.
123 */
124
125#ifdef SYSVSEM
126
127struct seminfo seminfo = {
128                SEMMAP,         /* # of entries in semaphore map */
129                SEMMNI,         /* # of semaphore identifiers */
130                SEMMNS,         /* # of semaphores in system */
131                SEMMNU,         /* # of undo structures in system */
132                SEMMSL,         /* max # of semaphores per id */
133                SEMOPM,         /* max # of operations per semop call */
134                SEMUME,         /* max # of undo entries per process */
135                SEMUSZ,         /* size in bytes of undo structure */
136                SEMVMX,         /* semaphore maximum value */
137                SEMAEM          /* adjust on exit max value */
138};
139#endif
140
141/*
142 * Values in support of System V compatible messages.
143 */
144
145#ifdef SYSVMSG
146
147struct msginfo msginfo = {
148                MSGMAX,         /* max chars in a message */
149                MSGMNI,         /* # of message queue identifiers */
150                MSGMNB,         /* max chars in a queue */
151                MSGTQL,         /* max messages in system */
152                MSGSSZ,         /* size of a message segment */
153                		/* (must be small power of 2 greater than 4) */
154                MSGSEG          /* number of message segments */
155};
156#endif
157
158/*
159 * These are initialized at bootstrap time
160 * to values dependent on memory size
161 */
162int	nbuf, nswbuf;
163
164/*
165 * These have to be allocated somewhere; allocating
166 * them here forces loader errors if this file is omitted
167 * (if they've been externed everywhere else; hah!).
168 */
169struct 	callout *callout;
170struct	cblock *cfree;
171struct	buf *buf, *swbuf;
172char	*buffers;
173
174/*
175 * Proc/pgrp hashing.
176 * Here so that hash table sizes can depend on MAXUSERS/NPROC.
177 * Hash size must be a power of two.
178 * NOW omission of this file will cause loader errors!
179 */
180
181#if NPROC > 1024
182#define	PIDHSZ		512
183#else
184#if NPROC > 512
185#define	PIDHSZ		256
186#else
187#if NPROC > 256
188#define	PIDHSZ		128
189#else
190#define	PIDHSZ		64
191#endif
192#endif
193#endif
194
195struct	proc *pidhash[PIDHSZ];
196struct	pgrp *pgrphash[PIDHSZ];
197int	pidhashmask = PIDHSZ - 1;
198