1 /** $MirOS: src/sys/conf/param.c,v 1.4 2008/10/20 19:09:52 tg Exp $ */ 2 /* $OpenBSD: param.c,v 1.23 2004/01/01 20:17:34 millert Exp $ */ 3 /* $NetBSD: param.c,v 1.16 1996/03/12 03:08:40 mrg Exp $ */ 4 5 /* 6 * Copyright (c) 1980, 1986, 1989 Regents of the University of California. 7 * All rights reserved. 8 * (c) UNIX System Laboratories, Inc. 9 * All or some portions of this file are derived from material licensed 10 * to the University of California by American Telephone and Telegraph 11 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 12 * the permission of UNIX System Laboratories, Inc. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)param.c 7.20 (Berkeley) 6/27/91 39 */ 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/socket.h> 44 #include <sys/proc.h> 45 #include <sys/vnode.h> 46 #include <sys/file.h> 47 #include <sys/timeout.h> 48 #include <sys/mbuf.h> 49 #include <ufs/ufs/quota.h> 50 #include <sys/kernel.h> 51 #ifdef SYSVSHM 52 #include <machine/vmparam.h> 53 #include <sys/shm.h> 54 #endif 55 #ifdef SYSVSEM 56 #include <sys/sem.h> 57 #endif 58 #ifdef SYSVMSG 59 #include <sys/msg.h> 60 #endif 61 62 /* 63 * System parameter formulae. 64 * 65 * This file is copied into each directory where we compile 66 * the kernel; it should be modified there to suit local taste 67 * if necessary. 68 * 69 * Compiled with -DHZ=xx -DTIMEZONE=x -DDST=x -DMAXUSERS=xx 70 */ 71 72 #ifndef TIMEZONE 73 # define TIMEZONE 0 74 #endif 75 #ifndef DST 76 # define DST 0 77 #endif 78 #ifndef HZ 79 #define HZ 100 80 #endif 81 int hz = HZ; 82 int tick = 1000000 / HZ; 83 int tickadj = 240000 / (60 * HZ); /* can adjust 240ms in 60s */ 84 struct timezone tz = { TIMEZONE, DST }; 85 #define NPROC (20 + 16 * MAXUSERS) 86 int maxproc = NPROC; 87 #define NTEXT (80 + NPROC / 8) /* actually the object cache */ 88 #ifndef NVNODE 89 #define NVNODE (NPROC * 2 + NTEXT + 100) 90 #endif 91 int desiredvnodes = NVNODE; 92 int maxfiles = 3 * (NPROC + MAXUSERS) + 80; 93 int nmbclust = NMBCLUSTERS; 94 95 #ifndef MBLOWAT 96 #define MBLOWAT 16 97 #endif 98 int mblowat = MBLOWAT; 99 100 #ifndef MCLLOWAT 101 #define MCLLOWAT 8 102 #endif 103 int mcllowat = MCLLOWAT; 104 105 106 int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */ 107 108 int shmseg = 8; 109 int shmmaxpgs = SHMMAXPGS; 110 /* 111 * Values in support of System V compatible shared memory. XXX 112 */ 113 #ifdef SYSVSHM 114 #define SHMMAX SHMMAXPGS /* shminit() performs a `*= PAGE_SIZE' */ 115 #define SHMMIN 1 116 #define SHMMNI 128 /* <64k, see IPCID_TO_IX in ipc.h */ 117 #define SHMSEG 128 118 #define SHMALL (SHMMAXPGS) 119 120 struct shminfo shminfo = { 121 SHMMAX, 122 SHMMIN, 123 SHMMNI, 124 SHMSEG, 125 SHMALL 126 }; 127 #endif 128 129 /* 130 * Values in support of System V compatible semaphores. 131 */ 132 #ifdef SYSVSEM 133 struct seminfo seminfo = { 134 SEMMNI, /* # of semaphore identifiers */ 135 SEMMNS, /* # of semaphores in system */ 136 SEMMNU, /* # of undo structures in system */ 137 SEMMSL, /* max # of semaphores per id */ 138 SEMOPM, /* max # of operations per semop call */ 139 SEMUME, /* max # of undo entries per process */ 140 SEMUSZ, /* size in bytes of undo structure */ 141 SEMVMX, /* semaphore maximum value */ 142 SEMAEM /* adjust on exit max value */ 143 }; 144 #endif 145 146 /* 147 * Values in support of System V compatible messages. 148 */ 149 #ifdef SYSVMSG 150 struct msginfo msginfo = { 151 MSGMAX, /* max chars in a message */ 152 MSGMNI, /* # of message queue identifiers */ 153 MSGMNB, /* max chars in a queue */ 154 MSGTQL, /* max messages in system */ 155 MSGSSZ, /* size of a message segment */ 156 /* (must be small power of 2 greater than 4) */ 157 MSGSEG /* number of message segments */ 158 }; 159 #endif 160 161 /* 162 * These have to be allocated somewhere; allocating 163 * them here forces loader errors if this file is omitted 164 * (if they've been externed everywhere else; hah!). 165 */ 166 struct buf *buf; 167 char *buffers; 168 169 int rootdev_override = 0; 170