sys/conf/param.c

/*
 * Copyright (c) 1980, 1986, 1989 Regents of the University of California.
 * All rights reserved.
 *
 * 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.
 *
 *      from: @(#)param.c       7.20 (Berkeley) 6/27/91
 *      $Id$
 */

#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 "ufs/quota.h"
#include "sys/kernel.h"
#ifdef SYSVSHM
#include "machine/vmparam.h"
#include "sys/shm.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 -DMAXFDESCS=xx
 */

#ifndef HZ
#define HZ 100
#endif
int     hz = HZ;
int     tick = 1000000 / HZ;
int     tickadj = 240000 / (60 * HZ);           /* can adjust 240ms in 60s */
struct  timezone tz = { TIMEZONE, DST };
#define NPROC (20 + 16 * MAXUSERS)
int     maxproc = NPROC;
#define NTEXT (80 + NPROC / 8)                  /* actually the object cache */
#define NVNODE (NPROC + NTEXT + 100)
long    desiredvnodes = NVNODE;
int     maxfdescs = MAXFDESCS;
int     maxfiles = 3 * (NPROC + MAXUSERS) + 80;
int     ncallout = 16 + NPROC;
int     nclist = 60 + 12 * MAXUSERS;
int     nmbclusters = NMBCLUSTERS;
int     fscale = FSCALE;        /* kernel uses `FSCALE', user uses `fscale' */

/*
 * Values in support of System V compatible shared memory.      XXX
 */
#ifdef SYSVSHM
#define SHMMAX  (SHMMAXPGS*NBPG)
#define SHMMIN  1
#define SHMMNI  32                      /* <= SHMMMNI in shm.h */
#define SHMSEG  8
#define SHMALL  (SHMMAXPGS/CLSIZE)

struct  shminfo shminfo = {
        SHMMAX,
        SHMMIN,
        SHMMNI,
        SHMSEG,
        SHMALL
};
#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;