param.c

早期freebsd实现

/*
 * 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
 */

#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

/*
 * 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;
#define	NTEXT (80 + NPROC / 8)			/* actually the object cache */
#define	NVNODE (NPROC + NTEXT + 100)
int	desiredvnodes = NVNODE;
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;