| 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 | |