186 lines
5.7 KiB
C
186 lines
5.7 KiB
C
/*
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* Copyright (c) 1980, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)param.c 8.2 (Berkeley) 1/21/94
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* $Id: param.c,v 1.5 1995/01/09 16:04:20 davidg Exp $
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/socket.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <sys/file.h>
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#include <sys/callout.h>
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#include <sys/clist.h>
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#include <sys/mbuf.h>
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#include <sys/kernel.h>
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#include <ufs/ufs/quota.h>
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#ifdef SYSVSHM
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#include <machine/vmparam.h>
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#include <sys/shm.h>
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#endif
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#ifdef SYSVSEM
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#include "sys/sem.h"
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#endif
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#ifdef SYSVMSG
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#include "sys/msg.h"
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#endif
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/*
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* System parameter formulae.
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*
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* This file is copied into each directory where we compile
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* the kernel; it should be modified there to suit local taste
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* if necessary.
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*
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* Compiled with -DHZ=xx -DTIMEZONE=x -DDST=x -DMAXUSERS=xx
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*/
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#ifndef HZ
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#define HZ 100
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#endif
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int hz = HZ;
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int tick = 1000000 / HZ;
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int tickadj = 30000 / (60 * HZ); /* can adjust 30ms in 60s */
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struct timezone tz = { TIMEZONE, DST };
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#define NPROC (20 + 16 * MAXUSERS)
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int maxproc = NPROC; /* maximum # of processes */
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int maxfiles = NPROC*2; /* system wide open files limit */
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int ncallout = 16 + NPROC; /* maximum # of timer events */
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int nmbclusters = NMBCLUSTERS;
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int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */
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/*
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* Values in support of System V compatible shared memory. XXX
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*/
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#ifdef SYSVSHM
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#define SHMMAX (SHMMAXPGS*NBPG)
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#define SHMMIN 1
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#define SHMMNI 32 /* <= SHMMMNI in shm.h */
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#define SHMSEG 8
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#define SHMALL (SHMMAXPGS/CLSIZE)
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struct shminfo shminfo = {
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SHMMAX,
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SHMMIN,
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SHMMNI,
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SHMSEG,
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SHMALL
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};
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#endif
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/*
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* Values in support of System V compatible semaphores.
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*/
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#ifdef SYSVSEM
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struct seminfo seminfo = {
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SEMMAP, /* # of entries in semaphore map */
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SEMMNI, /* # of semaphore identifiers */
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SEMMNS, /* # of semaphores in system */
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SEMMNU, /* # of undo structures in system */
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SEMMSL, /* max # of semaphores per id */
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SEMOPM, /* max # of operations per semop call */
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SEMUME, /* max # of undo entries per process */
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SEMUSZ, /* size in bytes of undo structure */
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SEMVMX, /* semaphore maximum value */
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SEMAEM /* adjust on exit max value */
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};
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#endif
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/*
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* Values in support of System V compatible messages.
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*/
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#ifdef SYSVMSG
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struct msginfo msginfo = {
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MSGMAX, /* max chars in a message */
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MSGMNI, /* # of message queue identifiers */
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MSGMNB, /* max chars in a queue */
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MSGTQL, /* max messages in system */
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MSGSSZ, /* size of a message segment */
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/* (must be small power of 2 greater than 4) */
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MSGSEG /* number of message segments */
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};
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#endif
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/*
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* These are initialized at bootstrap time
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* to values dependent on memory size
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*/
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int nbuf, nswbuf;
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/*
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* These have to be allocated somewhere; allocating
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* them here forces loader errors if this file is omitted
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* (if they've been externed everywhere else; hah!).
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*/
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struct callout *callout;
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struct cblock *cfree;
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struct buf *buf, *swbuf;
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char *buffers;
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/*
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* Proc/pgrp hashing.
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* Here so that hash table sizes can depend on MAXUSERS/NPROC.
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* Hash size must be a power of two.
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* NOW omission of this file will cause loader errors!
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*/
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#if NPROC > 1024
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#define PIDHSZ 512
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#else
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#if NPROC > 512
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#define PIDHSZ 256
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#else
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#if NPROC > 256
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#define PIDHSZ 128
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#else
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#define PIDHSZ 64
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#endif
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#endif
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#endif
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struct proc *pidhash[PIDHSZ];
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struct pgrp *pgrphash[PIDHSZ];
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int pidhashmask = PIDHSZ - 1;
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