freebsd-skq/sys/kern/subr_param.c
joerg e0acfb2a48 Alow overriding of the various SHM* options.
Submitted by:	Heikki Suonsivu <hsu@fx7.cs.hut.fi>
1995-02-16 11:29:19 +00:00

196 lines
5.8 KiB
C

/*
* Copyright (c) 1980, 1986, 1989, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)param.c 8.2 (Berkeley) 1/21/94
* $Id: param.c,v 1.6 1995/01/12 03:38:12 davidg Exp $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/socket.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/file.h>
#include <sys/callout.h>
#include <sys/clist.h>
#include <sys/mbuf.h>
#include <sys/kernel.h>
#include <ufs/ufs/quota.h>
#ifdef SYSVSHM
#include <machine/vmparam.h>
#include <sys/shm.h>
#endif
#ifdef SYSVSEM
#include "sys/sem.h"
#endif
#ifdef SYSVMSG
#include "sys/msg.h"
#endif
/*
* System parameter formulae.
*
* This file is copied into each directory where we compile
* the kernel; it should be modified there to suit local taste
* if necessary.
*
* Compiled with -DHZ=xx -DTIMEZONE=x -DDST=x -DMAXUSERS=xx
*/
#ifndef HZ
#define HZ 100
#endif
int hz = HZ;
int tick = 1000000 / HZ;
int tickadj = 30000 / (60 * HZ); /* can adjust 30ms in 60s */
struct timezone tz = { TIMEZONE, DST };
#define NPROC (20 + 16 * MAXUSERS)
int maxproc = NPROC; /* maximum # of processes */
int maxfiles = NPROC*2; /* system wide open files limit */
int ncallout = 16 + NPROC; /* maximum # of timer events */
int nmbclusters = NMBCLUSTERS;
int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */
/*
* Values in support of System V compatible shared memory. XXX
*/
#ifdef SYSVSHM
#ifndef SHMMAX
#define SHMMAX (SHMMAXPGS*NBPG)
#endif
#ifndef SHMMIN
#define SHMMIN 1
#endif
#ifndef SHMMNI
#define SHMMNI 32 /* <= SHMMMNI in shm.h */
#endif
#ifndef SHMSEG
#define SHMSEG 8
#endif
#ifndef SHMALL
#define SHMALL (SHMMAXPGS/CLSIZE)
#endif
struct shminfo shminfo = {
SHMMAX,
SHMMIN,
SHMMNI,
SHMSEG,
SHMALL
};
#endif
/*
* Values in support of System V compatible semaphores.
*/
#ifdef SYSVSEM
struct seminfo seminfo = {
SEMMAP, /* # of entries in semaphore map */
SEMMNI, /* # of semaphore identifiers */
SEMMNS, /* # of semaphores in system */
SEMMNU, /* # of undo structures in system */
SEMMSL, /* max # of semaphores per id */
SEMOPM, /* max # of operations per semop call */
SEMUME, /* max # of undo entries per process */
SEMUSZ, /* size in bytes of undo structure */
SEMVMX, /* semaphore maximum value */
SEMAEM /* adjust on exit max value */
};
#endif
/*
* Values in support of System V compatible messages.
*/
#ifdef SYSVMSG
struct msginfo msginfo = {
MSGMAX, /* max chars in a message */
MSGMNI, /* # of message queue identifiers */
MSGMNB, /* max chars in a queue */
MSGTQL, /* max messages in system */
MSGSSZ, /* size of a message segment */
/* (must be small power of 2 greater than 4) */
MSGSEG /* number of message segments */
};
#endif
/*
* These are initialized at bootstrap time
* to values dependent on memory size
*/
int nbuf, nswbuf;
/*
* These have to be allocated somewhere; allocating
* them here forces loader errors if this file is omitted
* (if they've been externed everywhere else; hah!).
*/
struct callout *callout;
struct cblock *cfree;
struct buf *buf, *swbuf;
char *buffers;
/*
* Proc/pgrp hashing.
* Here so that hash table sizes can depend on MAXUSERS/NPROC.
* Hash size must be a power of two.
* NOW omission of this file will cause loader errors!
*/
#if NPROC > 1024
#define PIDHSZ 512
#else
#if NPROC > 512
#define PIDHSZ 256
#else
#if NPROC > 256
#define PIDHSZ 128
#else
#define PIDHSZ 64
#endif
#endif
#endif
struct proc *pidhash[PIDHSZ];
struct pgrp *pgrphash[PIDHSZ];
int pidhashmask = PIDHSZ - 1;