1 /* 2 * Copyright (c) 1980, 1986, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. 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 8.3 (Berkeley) 8/20/94 39 * $Id: param.c,v 1.24 1997/02/22 09:28:15 peter Exp $ 40 */ 41 42 #include "opt_sysvipc.h" 43 #include "opt_param.h" 44 45 #include <sys/param.h> 46 47 #ifdef SYSVSHM 48 #include <machine/vmparam.h> 49 #include <sys/shm.h> 50 #endif 51 #ifdef SYSVSEM 52 #include <sys/sem.h> 53 #endif 54 #ifdef SYSVMSG 55 #include <sys/msg.h> 56 #endif 57 58 /* 59 * System parameter formulae. 60 * 61 * This file is copied into each directory where we compile 62 * the kernel; it should be modified there to suit local taste 63 * if necessary. 64 * 65 * Compiled with -DMAXUSERS=xx 66 */ 67 68 #ifndef HZ 69 #define HZ 100 70 #endif 71 int hz = HZ; 72 int tick = 1000000 / HZ; 73 int tickadj = 30000 / (60 * HZ); /* can adjust 30ms in 60s */ 74 #define NPROC (20 + 16 * MAXUSERS) 75 int maxproc = NPROC; /* maximum # of processes */ 76 int maxprocperuid = NPROC-1; /* maximum # of processes per user */ 77 int maxfiles = NPROC*2; /* system wide open files limit */ 78 int maxfilesperproc = NPROC*2; /* per-process open files limit */ 79 int ncallout = 16 + NPROC; /* maximum # of timer events */ 80 81 /* maximum # of mbuf clusters */ 82 #ifndef NMBCLUSTERS 83 #define NMBCLUSTERS (512 + MAXUSERS * 16) 84 #endif 85 int nmbclusters = NMBCLUSTERS; 86 87 /* allocate 1/4th amount of virtual address space for mbufs XXX */ 88 int nmbufs = NMBCLUSTERS * 4; 89 90 int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */ 91 92 /* 93 * Values in support of System V compatible shared memory. XXX 94 */ 95 #ifdef SYSVSHM 96 #ifndef SHMMAX 97 #define SHMMAX (SHMMAXPGS*PAGE_SIZE) 98 #endif 99 #ifndef SHMMIN 100 #define SHMMIN 1 101 #endif 102 #ifndef SHMMNI 103 #define SHMMNI 32 /* <= SHMMMNI in shm.h */ 104 #endif 105 #ifndef SHMSEG 106 #define SHMSEG 8 107 #endif 108 #ifndef SHMALL 109 #define SHMALL (SHMMAXPGS) 110 #endif 111 112 struct shminfo shminfo = { 113 SHMMAX, 114 SHMMIN, 115 SHMMNI, 116 SHMSEG, 117 SHMALL 118 }; 119 #endif 120 121 /* 122 * Values in support of System V compatible semaphores. 123 */ 124 125 #ifdef SYSVSEM 126 127 struct seminfo seminfo = { 128 SEMMAP, /* # of entries in semaphore map */ 129 SEMMNI, /* # of semaphore identifiers */ 130 SEMMNS, /* # of semaphores in system */ 131 SEMMNU, /* # of undo structures in system */ 132 SEMMSL, /* max # of semaphores per id */ 133 SEMOPM, /* max # of operations per semop call */ 134 SEMUME, /* max # of undo entries per process */ 135 SEMUSZ, /* size in bytes of undo structure */ 136 SEMVMX, /* semaphore maximum value */ 137 SEMAEM /* adjust on exit max value */ 138 }; 139 #endif 140 141 /* 142 * Values in support of System V compatible messages. 143 */ 144 145 #ifdef SYSVMSG 146 147 struct msginfo msginfo = { 148 MSGMAX, /* max chars in a message */ 149 MSGMNI, /* # of message queue identifiers */ 150 MSGMNB, /* max chars in a queue */ 151 MSGTQL, /* max messages in system */ 152 MSGSSZ, /* size of a message segment */ 153 /* (must be small power of 2 greater than 4) */ 154 MSGSEG /* number of message segments */ 155 }; 156 #endif 157 158 /* 159 * These may be set to nonzero here or by patching. 160 * If they are nonzero at bootstrap time then they are 161 * initialized to values dependent on the memory size. 162 */ 163 #ifdef NBUF 164 int nbuf = NBUF; 165 #else 166 int nbuf = 0; 167 #endif 168 int nswbuf = 0; 169 170 /* 171 * These have to be allocated somewhere; allocating 172 * them here forces loader errors if this file is omitted 173 * (if they've been externed everywhere else; hah!). 174 */ 175 struct buf *swbuf; 176