1 /* $NetBSD: param.c,v 1.60 2009/03/06 20:31:54 joerg 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 1.60 2009/03/06 20:31:54 joerg 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; 221