/*-

 * 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.

 * 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

 * $FreeBSD: src/sys/sys/param.h,v 1.244.2.2 2005/08/13 21:27:58 rwatson Exp $

 */

#ifndef _SYS_PARAM_H_

#define _SYS_PARAM_H_

#include <sys/_null.h>

#define	BSD	199506		/* System version (year & month). */

#define BSD4_3	1

#define BSD4_4	1

/* 

 * __FreeBSD_version numbers are documented in the Porter's Handbook.

 * If you bump the version for any reason, you should update the documentation

 * there.

 * Currently this lives here:

 *

 *	doc/en_US.ISO8859-1/books/porters-handbook/book.sgml

 *

 * scheme is:  <major><two digit minor>Rxx

 *		'R' is 0 if release branch or x.0-CURRENT before RELENG_*_0

 *		is created, otherwise 1.

 */

#undef __FreeBSD_version

#define __FreeBSD_version 600034	/* Master, propagated to newvers */

#ifndef LOCORE

#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+1 (see <utmp.h>)

 */

#include <sys/syslimits.h>

#define	MAXCOMLEN	19		/* max command name remembered */

#define	MAXINTERP	32		/* max interpreter file name length */

#define	MAXLOGNAME	17		/* max login name length (incl. NUL) */

#define	MAXUPRC		CHILD_MAX	/* max simultaneous processes */

#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 */

#define SPECNAMELEN	63		/* max length of devicename */

/* More types and definitions used throughout the kernel. */

#ifdef _KERNEL

#if 0

#if (defined(BURN_BRIDGES) || __FreeBSD_version >= 600000) \

	&& defined(OBSOLETE_IN_6)

#error "This file contains obsolete code to be removed in 6.0-current"

#endif

#endif

#include <sys/cdefs.h>

#include <sys/errno.h>

#include <sys/time.h>

#ifndef __SYMBIAN32__

#include <sys/priority.h>

#endif //__SYMBIAN32__

#define	FALSE	0

#define	TRUE	1

#endif

#ifndef _KERNEL

/* Signals. */

#ifndef __SYMBIAN32__

#include <sys/signal.h>

#endif //__SYMBIAN32__

#endif

/* Machine type dependent parameters. */

#include <machine/param.h>

#ifndef _KERNEL

#include <sys/limits.h>

#endif

#ifndef _NO_NAMESPACE_POLLUTION

#ifndef DEV_BSHIFT

#define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */

#endif

#define	DEV_BSIZE	(1<<DEV_BSHIFT)

#ifndef BLKDEV_IOSIZE

#define BLKDEV_IOSIZE  PAGE_SIZE	/* default block device I/O size */

#endif

#ifndef DFLTPHYS

#define DFLTPHYS	(64 * 1024)	/* default max raw I/O transfer size */

#endif

#ifndef MAXPHYS

#define MAXPHYS		(128 * 1024)	/* max raw I/O transfer size */

#endif

#ifndef MAXDUMPPGS

#define MAXDUMPPGS	(DFLTPHYS/PAGE_SIZE)

#endif

/*

 * Constants related to network buffer management.

 * MCLBYTES must be no larger than PAGE_SIZE.

 */

#ifndef	MSIZE

#define MSIZE		256		/* size of an mbuf */

#endif	/* MSIZE */

#ifndef	MCLSHIFT

#define MCLSHIFT	11		/* convert bytes to mbuf clusters */

#endif	/* MCLSHIFT */

#define MCLBYTES	(1 << MCLSHIFT)	/* size of an mbuf cluster */

/*

 * Some macros for units conversion

 */

/* clicks to bytes */

#ifndef ctob

#define ctob(x)	((x)<<PAGE_SHIFT)

#endif

/* bytes to clicks */

#ifndef btoc

#define btoc(x)	(((vm_offset_t)(x)+PAGE_MASK)>>PAGE_SHIFT)

#endif

/*

 * btodb() is messy and perhaps slow because `bytes' may be an off_t.  We

 * want to shift an unsigned type to avoid sign extension and we don't

 * want to widen `bytes' unnecessarily.  Assume that the result fits in

 * a daddr_t.

 */

#ifndef btodb

#define btodb(bytes)	 		/* calculates (bytes / DEV_BSIZE) */ \

	(sizeof (bytes) > sizeof(long) \

	 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \

	 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT))

#endif

#ifndef dbtob

#define dbtob(db)			/* calculates (db * DEV_BSIZE) */ \

	((off_t)(db) << DEV_BSHIFT)

#endif

#endif /* _NO_NAMESPACE_POLLUTION */

#define	PRIMASK	0x0ff

#define	PCATCH	0x100		/* OR'd with pri for tsleep to check signals */

#define	PDROP	0x200	/* OR'd with pri to stop re-entry of interlock mutex */

#define	NZERO	0		/* default "nice" */

#define	NBBY	8		/* number of bits in a byte */

#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	128		/* 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.

 *

 * MAXBSIZE -	Filesystems are made out of blocks of at most MAXBSIZE bytes

 *		per block.  MAXBSIZE may be made larger without effecting

 *		any existing filesystems as long as it does not exceed MAXPHYS,

 *		and may be made smaller at the risk of not being able to use

 *		filesystems which require a block size exceeding MAXBSIZE.

 *

 * BKVASIZE -	Nominal buffer space per buffer, in bytes.  BKVASIZE is the

 *		minimum KVM memory reservation the kernel is willing to make.

 *		Filesystems can of course request smaller chunks.  Actual 

 *		backing memory uses a chunk size of a page (PAGE_SIZE).

 *

 *		If you make BKVASIZE too small you risk seriously fragmenting

 *		the buffer KVM map which may slow things down a bit.  If you

 *		make it too big the kernel will not be able to optimally use 

 *		the KVM memory reserved for the buffer cache and will wind 

 *		up with too-few buffers.

 *

 *		The default is 16384, roughly 2x the block size used by a

 *		normal UFS filesystem.

 */

#define MAXBSIZE	65536	/* must be power of 2 */

#define BKVASIZE	16384	/* must be power of 2 */

#define BKVAMASK	(BKVASIZE-1)

/*

 * 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	rounddown(x, y)	(((x)/(y))*(y))

#define	roundup(x, y)	((((x)+((y)-1))/(y))*(y))  /* to any y */

#define	roundup2(x, y)	(((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */

#define powerof2(x)	((((x)-1)&(x))==0)

/* Macros for min/max. */

#define	MIN(a,b) (((a)<(b))?(a):(b))

#define	MAX(a,b) (((a)>(b))?(a):(b))

#ifdef _KERNEL

/*

 * Basic byte order function prototypes for non-inline functions.

 */

#ifndef _BYTEORDER_PROTOTYPED

#define	_BYTEORDER_PROTOTYPED

__BEGIN_DECLS

__uint32_t	 htonl(__uint32_t);

__uint16_t	 htons(__uint16_t);

__uint32_t	 ntohl(__uint32_t);

__uint16_t	 ntohs(__uint16_t);

__END_DECLS

#endif

#ifndef lint

#ifndef _BYTEORDER_FUNC_DEFINED

#define	_BYTEORDER_FUNC_DEFINED

#define	htonl(x)	__htonl(x)

#define	htons(x)	__htons(x)

#define	ntohl(x)	__ntohl(x)

#define	ntohs(x)	__ntohs(x)

#endif /* !_BYTEORDER_FUNC_DEFINED */

#endif /* lint */

#endif /* _KERNEL */

/*

 * 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: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and

 * MAXALLOCSIZE must be a power of two.

 */

#if defined(__alpha__) || defined(__ia64__) || defined(__sparc64__)

#define MINBUCKET	5		/* 5 => min allocation of 32 bytes */

#else

#define MINBUCKET	4		/* 4 => min allocation of 16 bytes */

#endif

#define MAXALLOCSAVE	(2 * PAGE_SIZE)

/*

 * 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)

#define dbtoc(db)			/* calculates devblks to pages */ \

	((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT))

#define ctodb(db)			/* calculates pages to devblks */ \

	((db) << (PAGE_SHIFT - DEV_BSHIFT))

#endif	/* _SYS_PARAM_H_ */