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      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;
    154