1 /* $NetBSD: param.c,v 1.67 2015/11/09 01:21:18 pgoyette 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 1.67 2015/11/09 01:21:18 pgoyette 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 #endif 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/socket.h> 53 #include <sys/socketvar.h> 54 #include <sys/proc.h> 55 #include <sys/vnode.h> 56 #include <sys/file.h> 57 #include <sys/callout.h> 58 #include <sys/mbuf.h> 59 #include <ufs/ufs/quota.h> 60 #include <sys/kernel.h> 61 #include <sys/utsname.h> 62 #include <sys/lwp.h> 63 #ifdef SYSVSHM 64 #include <machine/vmparam.h> 65 #include <sys/shm.h> 66 #endif 67 #ifdef SYSVSEM 68 #include <sys/sem.h> 69 #endif 70 #ifdef SYSVMSG 71 #include <sys/msg.h> 72 #endif 73 74 /* 75 * PCC cannot handle the 80KB string literal. 76 */ 77 #if !defined(__PCC__) 78 #define CONFIG_FILE 79 #include "config_file.h" 80 #endif 81 82 /* 83 * System parameter formulae. 84 * 85 * This file is copied into each directory where we compile 86 * the kernel; it should be modified there to suit local taste 87 * if necessary. 88 * 89 * Compiled with -DHZ=xx -DRTC_OFFSET=x -DMAXUSERS=xx 90 */ 91 92 #ifdef TIMEZONE 93 #error TIMEZONE is an obsolete kernel option. 94 #endif 95 96 #ifdef DST 97 #error DST is an obsolete kernel option. 98 #endif 99 100 #ifndef RTC_OFFSET 101 #define RTC_OFFSET 0 102 #endif 103 104 #ifndef HZ 105 #define HZ 100 106 #endif 107 108 #ifndef MAXFILES 109 #define MAXFILES (3 * (NPROC + MAXUSERS) + 80) 110 #endif 111 112 #ifndef MAXEXEC 113 #define MAXEXEC 16 114 #endif 115 116 int hz = HZ; 117 int tick = 1000000 / HZ; 118 /* can adjust 240ms in 60s */ 119 int tickadj = (240000 / (60 * HZ)) ? (240000 / (60 * HZ)) : 1; 120 int rtc_offset = RTC_OFFSET; 121 int maxproc = NPROC; 122 int maxlwp = MAXLWP; 123 int desiredvnodes = NVNODE; 124 u_int maxfiles = MAXFILES; 125 int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */ 126 int maxexec = MAXEXEC; /* max number of concurrent exec() calls */ 127 128 #ifdef MULTIPROCESSOR 129 u_int maxcpus = MAXCPUS; 130 size_t coherency_unit = COHERENCY_UNIT; 131 #else 132 u_int maxcpus = 1; 133 size_t coherency_unit = ALIGNBYTES + 1; 134 #endif 135 136 /* 137 * Various mbuf-related parameters. These can also be changed at run-time 138 * with sysctl. 139 */ 140 int nmbclusters = 0; 141 142 #ifndef MBLOWAT 143 #define MBLOWAT 16 144 #endif 145 int mblowat = MBLOWAT; 146 147 #ifndef MCLLOWAT 148 #define MCLLOWAT 8 149 #endif 150 int mcllowat = MCLLOWAT; 151 152 #if XXX_PRG 153 /* 154 * Values in support of System V compatible shared memory. XXX 155 */ 156 #ifdef SYSVSHM 157 #if !defined(SHMMAX) && defined(SHMMAXPGS) 158 #define SHMMAX SHMMAXPGS /* shminit() performs a `*= PAGE_SIZE' */ 159 #elif !defined(SHMMAX) 160 #define SHMMAX 0 161 #endif 162 #ifndef SHMMIN 163 #define SHMMIN 1 164 #endif 165 #ifndef SHMMNI 166 #define SHMMNI 128 /* <64k, see IPCID_TO_IX in ipc.h */ 167 #endif 168 #ifndef SHMSEG 169 #define SHMSEG 128 170 #endif 171 172 struct shminfo shminfo = { 173 SHMMAX, 174 SHMMIN, 175 SHMMNI, 176 SHMSEG, 177 0 178 }; 179 #endif 180 181 /* 182 * Values in support of System V compatible semaphores. 183 */ 184 #ifdef SYSVSEM 185 struct seminfo seminfo = { 186 SEMMAP, /* # of entries in semaphore map */ 187 SEMMNI, /* # of semaphore identifiers */ 188 SEMMNS, /* # of semaphores in system */ 189 SEMMNU, /* # of undo structures in system */ 190 SEMMSL, /* max # of semaphores per id */ 191 SEMOPM, /* max # of operations per semop call */ 192 SEMUME, /* max # of undo entries per process */ 193 SEMUSZ, /* size in bytes of undo structure */ 194 SEMVMX, /* semaphore maximum value */ 195 SEMAEM /* adjust on exit max value */ 196 }; 197 #endif 198 199 /* 200 * Values in support of System V compatible messages. 201 */ 202 #ifdef SYSVMSG 203 struct msginfo msginfo = { 204 MSGMAX, /* max chars in a message */ 205 MSGMNI, /* # of message queue identifiers */ 206 MSGMNB, /* max chars in a queue */ 207 MSGTQL, /* max messages in system */ 208 MSGSSZ, /* size of a message segment */ 209 /* (must be small power of 2 greater than 4) */ 210 MSGSEG /* number of message segments */ 211 }; 212 #endif 213 #endif /* XXX_PRG */ 214 215 /* 216 * Actual network mbuf sizes (read-only), for netstat. 217 */ 218 const int msize = MSIZE; 219 const int mclbytes = MCLBYTES; 220