sys/conf/param.c

   1 /*      $NetBSD: param.c,v 1.61 2009/05/02 14:13:28 pooka 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 1.61 2009/05/02 14:13:28 pooka Exp $");
  41
  42 #include "opt_hz.h"
  43 #include "opt_rtc_offset.h"
  44 #include "opt_sysv.h"
  45 #include "opt_sysvparam.h"
  46 #include "opt_nmbclusters.h"
  47 #include "opt_multiprocessor.h"
  48
  49 #include <sys/param.h>
  50 #include <sys/systm.h>
  51 #include <sys/socket.h>
  52 #include <sys/socketvar.h>
  53 #include <sys/proc.h>
  54 #include <sys/vnode.h>
  55 #include <sys/file.h>
  56 #include <sys/callout.h>
  57 #include <sys/mbuf.h>
  58 #include <ufs/ufs/quota.h>
  59 #include <sys/kernel.h>
  60 #include <sys/utsname.h>
  61 #include <sys/ksem.h>
  62 #ifdef SYSVSHM
  63 #include <machine/vmparam.h>
  64 #include <sys/shm.h>
  65 #endif
  66 #ifdef SYSVSEM
  67 #include <sys/sem.h>
  68 #endif
  69 #ifdef SYSVMSG
  70 #include <sys/msg.h>
  71 #endif
  72
  73 /*
  74  * PCC cannot handle the 80KB string literal.
  75  */
  76 #if !defined(__PCC__)
  77 #define CONFIG_FILE
  78 #include "config_file.h"
  79 #endif
  80
  81 /*
  82  * System parameter formulae.
  83  *
  84  * This file is copied into each directory where we compile
  85  * the kernel; it should be modified there to suit local taste
  86  * if necessary.
  87  *
  88  * Compiled with -DHZ=xx -DRTC_OFFSET=x -DMAXUSERS=xx
  89  */
  90
  91 #ifdef TIMEZONE
  92 #error TIMEZONE is an obsolete kernel option.
  93 #endif
  94
  95 #ifdef DST
  96 #error DST is an obsolete kernel option.
  97 #endif
  98
  99 #ifndef RTC_OFFSET
 100 #define RTC_OFFSET 0
 101 #endif
 102
 103 #ifndef HZ
 104 #define HZ 100
 105 #endif
 106
 107 #ifndef MAXFILES
 108 #define MAXFILES        (3 * (NPROC + MAXUSERS) + 80)
 109 #endif
 110
 111 #ifndef MAXEXEC
 112 #define MAXEXEC         16
 113 #endif
 114
 115 int     hz = HZ;
 116 int     tick = 1000000 / HZ;
 117 /* can adjust 240ms in 60s */
 118 int     tickadj = (240000 / (60 * HZ)) ? (240000 / (60 * HZ)) : 1;
 119 int     rtc_offset = RTC_OFFSET;
 120 int     maxproc = NPROC;
 121 int     desiredvnodes = NVNODE;
 122 u_int   maxfiles = MAXFILES;
 123 int     fscale = FSCALE;        /* kernel uses `FSCALE', user uses `fscale' */
 124 int     maxexec = MAXEXEC;      /* max number of concurrent exec() calls */
 125
 126 #ifdef MULTIPROCESSOR
 127 u_int   maxcpus = MAXCPUS;
 128 size_t  coherency_unit = COHERENCY_UNIT;
 129 #else
 130 u_int   maxcpus = 1;
 131 size_t  coherency_unit = ALIGNBYTES + 1;
 132 #endif
 133
 134 /*
 135  * Various mbuf-related parameters.  These can also be changed at run-time
 136  * with sysctl.
 137  */
 138 int     nmbclusters = NMBCLUSTERS;
 139
 140 #ifndef MBLOWAT
 141 #define MBLOWAT         16
 142 #endif
 143 int     mblowat = MBLOWAT;
 144
 145 #ifndef MCLLOWAT
 146 #define MCLLOWAT        8
 147 #endif
 148 int     mcllowat = MCLLOWAT;
 149
 150 /*
 151  * Values in support of System V compatible shared memory.      XXX
 152  */
 153 #ifdef SYSVSHM
 154 #if !defined(SHMMAX) && defined(SHMMAXPGS)
 155 #define SHMMAX  SHMMAXPGS       /* shminit() performs a `*= PAGE_SIZE' */
 156 #elif !defined(SHMMAX)
 157 #define SHMMAX 0
 158 #endif
 159 #ifndef SHMMIN
 160 #define SHMMIN  1
 161 #endif
 162 #ifndef SHMMNI
 163 #define SHMMNI  128             /* <64k, see IPCID_TO_IX in ipc.h */
 164 #endif
 165 #ifndef SHMSEG
 166 #define SHMSEG  128
 167 #endif
 168
 169 struct  shminfo shminfo = {
 170         SHMMAX,
 171         SHMMIN,
 172         SHMMNI,
 173         SHMSEG,
 174         0
 175 };
 176 #endif
 177
 178 /*
 179  * Values in support of System V compatible semaphores.
 180  */
 181 #ifdef SYSVSEM
 182 struct  seminfo seminfo = {
 183         SEMMAP,         /* # of entries in semaphore map */
 184         SEMMNI,         /* # of semaphore identifiers */
 185         SEMMNS,         /* # of semaphores in system */
 186         SEMMNU,         /* # of undo structures in system */
 187         SEMMSL,         /* max # of semaphores per id */
 188         SEMOPM,         /* max # of operations per semop call */
 189         SEMUME,         /* max # of undo entries per process */
 190         SEMUSZ,         /* size in bytes of undo structure */
 191         SEMVMX,         /* semaphore maximum value */
 192         SEMAEM          /* adjust on exit max value */
 193 };
 194 #endif
 195
 196 /*
 197  * Values in support of System V compatible messages.
 198  */
 199 #ifdef SYSVMSG
 200 struct  msginfo msginfo = {
 201         MSGMAX,         /* max chars in a message */
 202         MSGMNI,         /* # of message queue identifiers */
 203         MSGMNB,         /* max chars in a queue */
 204         MSGTQL,         /* max messages in system */
 205         MSGSSZ,         /* size of a message segment */
 206                         /* (must be small power of 2 greater than 4) */
 207         MSGSEG          /* number of message segments */
 208 };
 209 #endif
 210
 211 /*
 212  * Actual network mbuf sizes (read-only), for netstat.
 213  */
 214 const   int msize = MSIZE;
 215 const   int mclbytes = MCLBYTES;
 216
 217 /*
 218  * Values in support of POSIX semaphores.
 219  */
 220 int     ksem_max = KSEM_MAX;