param.h

基于组件方式开发操作系统的OSKIT源代码

/*	$NetBSD: param.h,v 1.115 2000/12/10 23:17:28 fvdl Exp $	*/

/*-
 * Copyright (c) 1982, 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.h	8.3 (Berkeley) 4/4/95
 */

#ifndef _SYS_PARAM_H_
#define _SYS_PARAM_H_

/*
 * Historic BSD #defines -- probably will remain untouched for all time.
 */
#define	BSD	199506		/* System version (year & month). */
#define BSD4_3	1
#define BSD4_4	1

/*
 *	#define __NetBSD_Version__ MMmmrrpp00
 *
 *	M = major version
 *	m = minor version
 *	r = release ["",A-Z,Z[A-Z] but numeric]
 *	p = patchlevel
 *
 *	So:
 *	     NetBSD-1.2D  = 102040000
 *	And:
 *	     NetBSD-1.2.1 = 102000100
 *
 */

#define __NetBSD_Version__  105140000	/* NetBSD 1.5N */

/*
 * Historical NetBSD #define
 *
 * NetBSD 1.4 was the last release for which this value was incremented.
 * The value is now permanently fixed at 199905. It will never be
 * changed again.
 *
 * New code must use __NetBSD_Version__ instead, and should not even
 * count on NetBSD being defined.
 *
 */

#define NetBSD	199905		/* NetBSD version (year & month). */

#include <sys/null.h>

#ifndef _LOCORE
#include <sys/inttypes.h>
#include <sys/types.h>
#endif

/*
 * Machine-independent constants (some used in following include files).
 * Redefined constants are from POSIX 1003.1 limits file.
 *
 * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>)
 * MAXLOGNAME should be >= UT_NAMESIZE (see <utmp.h>)
 */
#include <sys/syslimits.h>

#define	MAXCOMLEN	16		/* max command name remembered */
#define	MAXINTERP	64		/* max interpreter file name length */
/* DEPRECATED: use LOGIN_NAME_MAX instead. */
#define	MAXLOGNAME	(LOGIN_NAME_MAX - 1) /* max login name length */
#define	NCARGS		ARG_MAX		/* max bytes for an exec function */
#define	NGROUPS		NGROUPS_MAX	/* max number groups */
#define	NOFILE		OPEN_MAX	/* max open files per process */
#define	NOGROUP		65535		/* marker for empty group set member */
#define MAXHOSTNAMELEN	256		/* max hostname size */

#ifndef MAXUPRC				/* max simultaneous processes */
#define MAXUPRC		CHILD_MAX	/* POSIX 1003.1-compliant default */
#else
#if (MAXUPRC - 0) < CHILD_MAX
#error MAXUPRC less than CHILD_MAX.  See options(4) for details.
#endif /* (MAXUPRC - 0) < CHILD_MAX */
#endif /* !defined(MAXUPRC) */

/* More types and definitions used throughout the kernel. */
#ifdef _KERNEL
#include <sys/cdefs.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/ucred.h>
#include <sys/uio.h>
#ifndef NPROC
#define	NPROC (20 + 16 * MAXUSERS)
#endif
#ifndef NTEXT
#define	NTEXT (80 + NPROC / 8)			/* actually the object cache */
#endif
#ifndef NVNODE
#define	NVNODE (NPROC + NTEXT + 100)
#define	NVNODE_IMPLICIT
#endif
#endif /* _KERNEL */

/* Signals. */
#include <sys/signal.h>

/* Machine type dependent parameters. */
#include <machine/param.h>
#include <machine/limits.h>

/*
 * Priorities.  Note that with 32 run queues, differences less than 4 are
 * insignificant.
 */
#define	PSWP	0
#define	PVM	4
#define	PINOD	8
#define	PRIBIO	16
#define	PVFS	20
#define	PZERO	22		/* No longer magic, shouldn't be here.  XXX */
#define	PSOCK	24
#define	PWAIT	32
#define	PLOCK	36
#define	PPAUSE	40
#define	PUSER	50
#define	MAXPRI	127		/* Priorities range from 0 through MAXPRI. */

#define	PRIMASK 	0x0ff
#define	PCATCH		0x100	/* OR'd with pri for tsleep to check signals */
#define	PNORELOCK	0x200	/* OR'd with pri for cond_wait() to not relock
				   the interlock */

#define	NBPW	sizeof(int)	/* number of bytes per word (integer) */

#define	CMASK	022		/* default file mask: S_IWGRP|S_IWOTH */
#define	NODEV	(dev_t)(-1)	/* non-existent device */

#define	CBLOCK	64		/* Clist block size, must be a power of 2. */
#define CBQSIZE	(CBLOCK/NBBY)	/* Quote bytes/cblock - can do better. */
				/* Data chars/clist. */
#define	CBSIZE	(CBLOCK - sizeof(struct cblock *) - CBQSIZE)
#define	CROUND	(CBLOCK - 1)	/* Clist rounding. */

/*
 * File system parameters and macros.
 *
 * The file system is made out of blocks of at most MAXBSIZE units, with
 * smaller units (fragments) only in the last direct block.  MAXBSIZE
 * primarily determines the size of buffers in the buffer pool.  It may be
 * made larger without any effect on existing file systems; however making
 * it smaller may make some file systems unmountable.
 */
#ifndef MAXBSIZE				/* XXX */
#define	MAXBSIZE	MAXPHYS
#endif
#define MAXFRAG 	8

/*
 * MAXPATHLEN defines the longest permissible path length after expanding
 * symbolic links. It is used to allocate a temporary buffer from the buffer
 * pool in which to do the name expansion, hence should be a power of two,
 * and must be less than or equal to MAXBSIZE.  MAXSYMLINKS defines the
 * maximum number of symbolic links that may be expanded in a path name.
 * It should be set high enough to allow all legitimate uses, but halt
 * infinite loops reasonably quickly.
 */
#define	MAXPATHLEN	PATH_MAX
#define MAXSYMLINKS	32

/* Bit map related macros. */
#define	setbit(a,i)	((a)[(i)/NBBY] |= 1<<((i)%NBBY))
#define	clrbit(a,i)	((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
#define	isset(a,i)	((a)[(i)/NBBY] & (1<<((i)%NBBY)))
#define	isclr(a,i)	(((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)

/* Macros for counting and rounding. */
#ifndef howmany
#define	howmany(x, y)	(((x)+((y)-1))/(y))
#endif
#define	roundup(x, y)	((((x)+((y)-1))/(y))*(y))
#define powerof2(x)	((((x)-1)&(x))==0)

/* Macros for min/max. */
#ifndef _KERNEL
#define	MIN(a,b) (((a)<(b))?(a):(b))
#define	MAX(a,b) (((a)>(b))?(a):(b))
#endif

/*
 * Constants for setting the parameters of the kernel memory allocator.
 *
 * 2 ** MINBUCKET is the smallest unit of memory that will be
 * allocated. It must be at least large enough to hold a pointer.
 *
 * Units of memory less or equal to MAXALLOCSAVE will permanently
 * allocate physical memory; requests for these size pieces of
 * memory are quite fast. Allocations greater than MAXALLOCSAVE must
 * always allocate and free physical memory; requests for these
 * size allocations should be done infrequently as they will be slow.
 *
 * Constraints: NBPG <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and
 * MAXALLOCSIZE must be a power of two.
 */
#define MINBUCKET	4		/* 4 => min allocation of 16 bytes */
#define MAXALLOCSAVE	(2 * NBPG)

/*
 * Scale factor for scaled integers used to count %cpu time and load avgs.
 *
 * The number of CPU `tick's that map to a unique `%age' can be expressed
 * by the formula (1 / (2 ^ (FSHIFT - 11))).  The maximum load average that
 * can be calculated (assuming 32 bits) can be closely approximated using
 * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15).
 *
 * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age',
 * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024.
 */
#define	FSHIFT	11		/* bits to right of fixed binary point */
#define FSCALE	(1<<FSHIFT)

/*
 * Defaults for Unified Buffer Cache parameters.
 */

#ifndef UBC_WINSIZE
#define UBC_WINSIZE 8192
#endif
#ifndef UBC_NWINS
#define UBC_NWINS 1024
#endif

#endif /* !_SYS_PARAM_H_ */