1994-05-24 10:09:53 +00:00
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/*-
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* Copyright (c) 1982, 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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1996-03-11 02:09:24 +00:00
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* @(#)param.h 8.3 (Berkeley) 4/4/95
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1999-08-28 01:08:13 +00:00
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* $FreeBSD$
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1994-05-24 10:09:53 +00:00
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*/
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1994-08-21 04:42:17 +00:00
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#ifndef _SYS_PARAM_H_
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#define _SYS_PARAM_H_
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1996-03-11 02:09:24 +00:00
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#define BSD 199506 /* System version (year & month). */
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1994-05-24 10:09:53 +00:00
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#define BSD4_3 1
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#define BSD4_4 1
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2001-07-23 17:51:02 +00:00
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/*
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* __FreeBSD_version numbers are documented in the Porter's Handbook.
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2001-09-17 06:54:26 +00:00
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* If you bump the version for any reason, you should update the documentation
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2001-07-23 17:51:02 +00:00
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* there.
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*/
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1998-05-21 19:21:46 +00:00
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#undef __FreeBSD_version
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2002-04-03 15:03:38 +00:00
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#define __FreeBSD_version 500033 /* Master, propagated to newvers */
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1994-05-24 10:09:53 +00:00
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#ifndef NULL
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#define NULL 0
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#endif
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#ifndef LOCORE
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#include <sys/types.h>
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#endif
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/*
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* Machine-independent constants (some used in following include files).
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* Redefined constants are from POSIX 1003.1 limits file.
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*
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* MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>)
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1997-03-03 09:51:15 +00:00
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* MAXLOGNAME should be == UT_NAMESIZE+1 (see <utmp.h>)
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1994-05-24 10:09:53 +00:00
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*/
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#include <sys/syslimits.h>
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2001-08-10 05:34:48 +00:00
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#define MAXCOMLEN 19 /* max command name remembered */
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1994-05-24 10:09:53 +00:00
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#define MAXINTERP 32 /* max interpreter file name length */
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1997-03-03 09:51:15 +00:00
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#define MAXLOGNAME 17 /* max login name length (incl. NUL) */
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1994-05-24 10:09:53 +00:00
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#define MAXUPRC CHILD_MAX /* max simultaneous processes */
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#define NCARGS ARG_MAX /* max bytes for an exec function */
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#define NGROUPS NGROUPS_MAX /* max number groups */
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#define NOFILE OPEN_MAX /* max open files per process */
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#define NOGROUP 65535 /* marker for empty group set member */
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#define MAXHOSTNAMELEN 256 /* max hostname size */
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2000-09-16 21:57:16 +00:00
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#define SPECNAMELEN 15 /* max length of devicename */
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1994-05-24 10:09:53 +00:00
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/* More types and definitions used throughout the kernel. */
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1999-12-29 04:46:21 +00:00
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#ifdef _KERNEL
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1994-05-24 10:09:53 +00:00
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#include <sys/cdefs.h>
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#include <sys/errno.h>
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#include <sys/time.h>
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2001-02-12 00:20:08 +00:00
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#include <sys/priority.h>
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1995-12-05 21:03:13 +00:00
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#define FALSE 0
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#define TRUE 1
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1994-05-24 10:09:53 +00:00
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#endif
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1999-12-29 04:46:21 +00:00
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#ifndef _KERNEL
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1994-05-24 10:09:53 +00:00
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/* Signals. */
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#include <sys/signal.h>
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1998-03-28 10:33:27 +00:00
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#endif
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1994-05-24 10:09:53 +00:00
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/* Machine type dependent parameters. */
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#include <machine/param.h>
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1999-12-29 04:46:21 +00:00
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#ifndef _KERNEL
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1994-05-24 10:09:53 +00:00
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#include <machine/limits.h>
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1998-03-28 10:33:27 +00:00
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#endif
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1994-05-24 10:09:53 +00:00
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#define PRIMASK 0x0ff
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#define PCATCH 0x100 /* OR'd with pri for tsleep to check signals */
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2000-09-11 00:20:02 +00:00
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#define PDROP 0x200 /* OR'd with pri to stop re-entry of interlock mutex */
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1994-05-24 10:09:53 +00:00
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#define NZERO 0 /* default "nice" */
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#define NBPW sizeof(int) /* number of bytes per word (integer) */
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#define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */
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1999-12-29 04:46:21 +00:00
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#ifdef _KERNEL
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1994-05-24 10:09:53 +00:00
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#define NODEV (dev_t)(-1) /* non-existent device */
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Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
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#define NOUDEV (udev_t)(-1) /* non-existent device */
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1999-05-09 08:58:45 +00:00
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#define NOMAJ 256 /* non-existent device */
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Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
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#else
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#define NODEV (dev_t)(-1) /* non-existent device */
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#endif
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1994-05-24 10:09:53 +00:00
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1994-05-25 09:21:21 +00:00
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#define CBLOCK 128 /* Clist block size, must be a power of 2. */
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1994-05-24 10:09:53 +00:00
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#define CBQSIZE (CBLOCK/NBBY) /* Quote bytes/cblock - can do better. */
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/* Data chars/clist. */
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#define CBSIZE (CBLOCK - sizeof(struct cblock *) - CBQSIZE)
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#define CROUND (CBLOCK - 1) /* Clist rounding. */
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/*
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* File system parameters and macros.
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*
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2000-03-27 21:29:33 +00:00
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* MAXBSIZE - Filesystems are made out of blocks of at most MAXBSIZE bytes
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* per block. MAXBSIZE may be made larger without effecting
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* any existing filesystems as long as it does not exceed MAXPHYS,
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* and may be made smaller at the risk of not being able to use
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* filesystems which require a block size exceeding MAXBSIZE.
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*
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* BKVASIZE - Nominal buffer space per buffer, in bytes. BKVASIZE is the
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* minimum KVM memory reservation the kernel is willing to make.
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* Filesystems can of course request smaller chunks. Actual
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* backing memory uses a chunk size of a page (PAGE_SIZE).
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*
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* If you make BKVASIZE too small you risk seriously fragmenting
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* the buffer KVM map which may slow things down a bit. If you
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* make it too big the kernel will not be able to optimally use
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* the KVM memory reserved for the buffer cache and will wind
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* up with too-few buffers.
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*
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* The default is 16384, roughly 2x the block size used by a
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* normal UFS filesystem.
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1994-05-24 10:09:53 +00:00
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*/
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2000-03-27 21:29:33 +00:00
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#define MAXBSIZE 65536 /* must be power of 2 */
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#define BKVASIZE 16384 /* must be power of 2 */
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#define BKVAMASK (BKVASIZE-1)
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1994-05-24 10:09:53 +00:00
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/*
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1996-01-30 23:02:38 +00:00
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* MAXPATHLEN defines the longest permissible path length after expanding
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1994-05-24 10:09:53 +00:00
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* symbolic links. It is used to allocate a temporary buffer from the buffer
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* pool in which to do the name expansion, hence should be a power of two,
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* and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the
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* maximum number of symbolic links that may be expanded in a path name.
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* It should be set high enough to allow all legitimate uses, but halt
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* infinite loops reasonably quickly.
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*/
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#define MAXPATHLEN PATH_MAX
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1995-02-07 03:33:05 +00:00
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#define MAXSYMLINKS 32
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1994-05-24 10:09:53 +00:00
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/* Bit map related macros. */
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#define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
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#define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
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#define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
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#define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
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/* Macros for counting and rounding. */
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#ifndef howmany
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#define howmany(x, y) (((x)+((y)-1))/(y))
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#endif
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1995-05-14 03:00:10 +00:00
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#define rounddown(x, y) (((x)/(y))*(y))
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1995-10-06 09:56:26 +00:00
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#define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */
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#define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */
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1994-05-24 10:09:53 +00:00
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#define powerof2(x) ((((x)-1)&(x))==0)
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/* Macros for min/max. */
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1999-12-29 04:46:21 +00:00
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#ifndef _KERNEL
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1994-05-24 10:09:53 +00:00
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#define MIN(a,b) (((a)<(b))?(a):(b))
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#define MAX(a,b) (((a)>(b))?(a):(b))
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#endif
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2002-02-18 20:35:27 +00:00
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/*
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2002-03-09 21:02:16 +00:00
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* Basic byte order function prototypes for non-inline functions.
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*
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* XXX temporarily exposed to userland for bogus software.
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2002-02-18 20:35:27 +00:00
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*/
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2002-03-09 21:02:16 +00:00
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#ifndef _BYTEORDER_PROTOTYPED
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#define _BYTEORDER_PROTOTYPED
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__BEGIN_DECLS
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2002-03-19 20:18:42 +00:00
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__uint32_t htonl(__uint32_t);
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__uint16_t htons(__uint16_t);
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__uint32_t ntohl(__uint32_t);
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__uint16_t ntohs(__uint16_t);
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2002-03-09 21:02:16 +00:00
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__END_DECLS
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2002-02-27 17:16:18 +00:00
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#endif
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2002-03-09 21:02:16 +00:00
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/* XXX temporarily exposed to userland for bogus software. */
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#ifndef _BYTEORDER_FUNC_DEFINED
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#define _BYTEORDER_FUNC_DEFINED
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#define htonl(x) __htonl(x)
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#define htons(x) __htons(x)
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#define ntohl(x) __ntohl(x)
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#define ntohs(x) __ntohs(x)
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#endif /* !_BYTEORDER_FUNC_DEFINED */
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2002-02-18 20:35:27 +00:00
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2002-03-09 21:02:16 +00:00
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#ifdef _KERNEL
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2002-02-27 17:16:18 +00:00
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#define bswap16(x) __bswap16(x)
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#define bswap32(x) __bswap32(x)
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#define bswap64(x) __bswap64(x)
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#if BYTE_ORDER == LITTLE_ENDIAN
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#define htobe16(x) bswap16((x))
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#define htobe32(x) bswap32((x))
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#define htobe64(x) bswap64((x))
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#define htole16(x) ((__uint16_t)(x))
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#define htole32(x) ((__uint32_t)(x))
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#define htole64(x) ((__uint64_t)(x))
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#define be16toh(x) bswap16((x))
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#define be32toh(x) bswap32((x))
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#define be64toh(x) bswap64((x))
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#define le16toh(x) ((__uint16_t)(x))
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#define le32toh(x) ((__uint32_t)(x))
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#define le64toh(x) ((__uint64_t)(x))
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#else /* BYTE_ORDER != LITTLE_ENDIAN */
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#define htobe16(x) ((__uint16_t)(x))
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#define htobe32(x) ((__uint32_t)(x))
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#define htobe64(x) ((__uint64_t)(x))
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#define htole16(x) bswap16((x))
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#define htole32(x) bswap32((x))
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#define htole64(x) bswap64((x))
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#define be16toh(x) ((__uint16_t)(x))
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#define be32toh(x) ((__uint32_t)(x))
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#define be64toh(x) ((__uint64_t)(x))
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#define le16toh(x) bswap16((x))
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#define le32toh(x) bswap32((x))
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#define le64toh(x) bswap64((x))
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#endif /* BYTE_ORDER */
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#endif /* _KERNEL */
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1994-05-24 10:09:53 +00:00
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/*
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* Constants for setting the parameters of the kernel memory allocator.
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*
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* 2 ** MINBUCKET is the smallest unit of memory that will be
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* allocated. It must be at least large enough to hold a pointer.
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*
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* Units of memory less or equal to MAXALLOCSAVE will permanently
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* allocate physical memory; requests for these size pieces of
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* memory are quite fast. Allocations greater than MAXALLOCSAVE must
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* always allocate and free physical memory; requests for these
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* size allocations should be done infrequently as they will be slow.
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*
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1996-05-02 14:21:14 +00:00
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* Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and
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1994-05-24 10:09:53 +00:00
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* MAXALLOCSIZE must be a power of two.
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*/
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2001-07-31 04:14:30 +00:00
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#if defined(__alpha__) || defined(__ia64__) || defined(__sparc64__)
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1998-07-12 16:49:54 +00:00
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#define MINBUCKET 5 /* 5 => min allocation of 32 bytes */
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#else
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1994-05-24 10:09:53 +00:00
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#define MINBUCKET 4 /* 4 => min allocation of 16 bytes */
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1998-07-12 16:49:54 +00:00
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#endif
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1996-05-02 14:21:14 +00:00
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#define MAXALLOCSAVE (2 * PAGE_SIZE)
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1994-05-24 10:09:53 +00:00
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/*
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* Scale factor for scaled integers used to count %cpu time and load avgs.
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*
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* The number of CPU `tick's that map to a unique `%age' can be expressed
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* by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that
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* can be calculated (assuming 32 bits) can be closely approximated using
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* the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15).
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*
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* For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age',
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* FSHIFT must be at least 11; this gives us a maximum load avg of ~1024.
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*/
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#define FSHIFT 11 /* bits to right of fixed binary point */
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#define FSCALE (1<<FSHIFT)
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1994-08-21 04:42:17 +00:00
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1999-01-21 08:29:12 +00:00
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#define dbtoc(db) /* calculates devblks to pages */ \
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((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT))
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#define ctodb(db) /* calculates pages to devblks */ \
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((db) << (PAGE_SHIFT - DEV_BSHIFT))
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1996-02-23 19:44:10 +00:00
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#endif /* _SYS_PARAM_H_ */
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