usr/src/boot/sys/sys/param.h - illumos-gate - Gitiles

 /*-
  * 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
  * $FreeBSD$
  */

 #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 in the doc/ repository:
  *
  *	head/en_US.ISO8859-1/books/porters-handbook/versions/chapter.xml
  *
  * scheme is:  <major><two digit minor>Rxx
  *		'R' is in the range 0 to 4 if this is a release branch or
  *		x.0-CURRENT before RELENG_*_0 is created, otherwise 'R' is
  *		in the range 5 to 9.
  */
 #undef __FreeBSD_version
 #define __FreeBSD_version 1100100	/* Master, propagated to newvers */

 /*
  * __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD,
  * which by definition is always true on FreeBSD. This macro is also defined
  * on other systems that use the kernel of FreeBSD, such as GNU/kFreeBSD.
  *
  * It is tempting to use this macro in userland code when we want to enable
  * kernel-specific routines, and in fact it's fine to do this in code that
  * is part of FreeBSD itself.  However, be aware that as presence of this
  * macro is still not widespread (e.g. older FreeBSD versions, 3rd party
  * compilers, etc), it is STRONGLY DISCOURAGED to check for this macro in
  * external applications without also checking for __FreeBSD__ as an
  * alternative.
  */
 #undef __FreeBSD_kernel__
 #define __FreeBSD_kernel__

 #ifdef _KERNEL
 #define	P_OSREL_SIGWAIT			700000
 #define	P_OSREL_SIGSEGV			700004
 #define	P_OSREL_MAP_ANON		800104
 #define	P_OSREL_MAP_FSTRICT		1100036
 #define	P_OSREL_SHUTDOWN_ENOTCONN	1100077

 #define	P_OSREL_MAJOR(x)		((x) / 100000)
 #endif

 #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>)
  */
 #include <sys/syslimits.h>

 #define	MAXCOMLEN	19		/* max command name remembered */
 #define	MAXINTERP	PATH_MAX	/* max interpreter file name length */
 #define	MAXLOGNAME	33		/* 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+1)	/* 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
 #include <sys/cdefs.h>
 #include <sys/errno.h>
 #ifndef LOCORE
 #include <sys/time.h>
 #include <sys/priority.h>
 #endif

 #ifndef FALSE
 #define	FALSE	0
 #endif
 #ifndef TRUE
 #define	TRUE	1
 #endif
 #endif

 #ifndef _KERNEL
 /* Signals. */
 #include <sys/signal.h>
 #endif

 /* Machine type dependent parameters. */
 #include <machine/param.h>
 #ifndef _KERNEL
 #include <sys/limits.h>
 #endif

 #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

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

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

 #if PAGE_SIZE < 2048
 #define	MJUMPAGESIZE	MCLBYTES
 #elif PAGE_SIZE <= 8192
 #define	MJUMPAGESIZE	PAGE_SIZE
 #else
 #define	MJUMPAGESIZE	(8 * 1024)
 #endif

 #define	MJUM9BYTES	(9 * 1024)	/* jumbo cluster 9k */
 #define	MJUM16BYTES	(16 * 1024)	/* jumbo cluster 16k */

 /*
  * 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

 #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 */

 /*
  * 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.
  *
  * MAXBCACHEBUF - Maximum size of a buffer in the buffer cache.  This must
  *		be >= MAXBSIZE and can be set differently for different
  *		architectures by defining it in <machine/param.h>.
  *		Making this larger allows NFS to do larger reads/writes.
  *
  * 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).
  *		The default value here can be overridden on a per-architecture
  *		basis by defining it in <machine/param.h>.  This should
  *		probably be done to increase its value, when MAXBCACHEBUF is
  *		defined as a larger value in <machine/param.h>.
  *
  *		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 */
 #ifndef	MAXBCACHEBUF
 #define	MAXBCACHEBUF	MAXBSIZE /* must be a power of 2 >= MAXBSIZE */
 #endif
 #ifndef	BKVASIZE
 #define BKVASIZE	16384	/* must be power of 2 */
 #endif
 #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)	(((unsigned char *)(a))[(i)/NBBY] |= 1<<((i)%NBBY))
 #define	clrbit(a,i)	(((unsigned char *)(a))[(i)/NBBY] &= ~(1<<((i)%NBBY)))
 #define	isset(a,i)							\
 	(((const unsigned char *)(a))[(i)/NBBY] & (1<<((i)%NBBY)))
 #define	isclr(a,i)							\
 	((((const unsigned char *)(a))[(i)/NBBY] & (1<<((i)%NBBY))) == 0)

 /* Macros for counting and rounding. */
 #ifndef howmany
 #define	howmany(x, y)	(((x)+((y)-1))/(y))
 #endif
 #define	nitems(x)	(sizeof((x)) / sizeof((x)[0]))
 #define	rounddown(x, y)	(((x)/(y))*(y))
 #define	rounddown2(x, y) ((x)&(~((y)-1)))          /* if y is power of two */
 #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 LOCORE
 #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
 #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 */

 /*
  * 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))

 /*
  * Old spelling of __containerof().
  */
 #define	member2struct(s, m, x)						\
 	((struct s *)(void *)((char *)(x) - offsetof(struct s, m)))

 /*
  * Access a variable length array that has been declared as a fixed
  * length array.
  */
 #define __PAST_END(array, offset) (((__typeof__(*(array)) *)(array))[offset])

 #endif	/* _SYS_PARAM_H_ */
	/*-
	* 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
	* $FreeBSD$
	*/

	#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 in the doc/ repository:
	*
	* head/en_US.ISO8859-1/books/porters-handbook/versions/chapter.xml
	*
	* scheme is: <major><two digit minor>Rxx
	* 'R' is in the range 0 to 4 if this is a release branch or
	* x.0-CURRENT before RELENG_*_0 is created, otherwise 'R' is
	* in the range 5 to 9.
	*/
	#undef __FreeBSD_version
	#define __FreeBSD_version 1100100 /* Master, propagated to newvers */

	/*
	* __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD,
	* which by definition is always true on FreeBSD. This macro is also defined
	* on other systems that use the kernel of FreeBSD, such as GNU/kFreeBSD.
	*
	* It is tempting to use this macro in userland code when we want to enable
	* kernel-specific routines, and in fact it's fine to do this in code that
	* is part of FreeBSD itself. However, be aware that as presence of this
	* macro is still not widespread (e.g. older FreeBSD versions, 3rd party
	* compilers, etc), it is STRONGLY DISCOURAGED to check for this macro in
	* external applications without also checking for __FreeBSD__ as an
	* alternative.
	*/
	#undef __FreeBSD_kernel__
	#define __FreeBSD_kernel__

	#ifdef _KERNEL
	#define P_OSREL_SIGWAIT 700000
	#define P_OSREL_SIGSEGV 700004
	#define P_OSREL_MAP_ANON 800104
	#define P_OSREL_MAP_FSTRICT 1100036
	#define P_OSREL_SHUTDOWN_ENOTCONN 1100077

	#define P_OSREL_MAJOR(x) ((x) / 100000)
	#endif

	#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>)
	*/
	#include <sys/syslimits.h>

	#define MAXCOMLEN 19 /* max command name remembered */
	#define MAXINTERP PATH_MAX /* max interpreter file name length */
	#define MAXLOGNAME 33 /* 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+1) /* 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
	#include <sys/cdefs.h>
	#include <sys/errno.h>
	#ifndef LOCORE
	#include <sys/time.h>
	#include <sys/priority.h>
	#endif

	#ifndef FALSE
	#define FALSE 0
	#endif
	#ifndef TRUE
	#define TRUE 1
	#endif
	#endif

	#ifndef _KERNEL
	/* Signals. */
	#include <sys/signal.h>
	#endif

	/* Machine type dependent parameters. */
	#include <machine/param.h>
	#ifndef _KERNEL
	#include <sys/limits.h>
	#endif

	#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

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

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

	#if PAGE_SIZE < 2048
	#define MJUMPAGESIZE MCLBYTES
	#elif PAGE_SIZE <= 8192
	#define MJUMPAGESIZE PAGE_SIZE
	#else
	#define MJUMPAGESIZE (8 * 1024)
	#endif

	#define MJUM9BYTES (9 * 1024) /* jumbo cluster 9k */
	#define MJUM16BYTES (16 * 1024) /* jumbo cluster 16k */

	/*
	* 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

	#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 */

	/*
	* 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.
	*
	* MAXBCACHEBUF - Maximum size of a buffer in the buffer cache. This must
	* be >= MAXBSIZE and can be set differently for different
	* architectures by defining it in <machine/param.h>.
	* Making this larger allows NFS to do larger reads/writes.
	*
	* 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).
	* The default value here can be overridden on a per-architecture
	* basis by defining it in <machine/param.h>. This should
	* probably be done to increase its value, when MAXBCACHEBUF is
	* defined as a larger value in <machine/param.h>.
	*
	* 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 */
	#ifndef MAXBCACHEBUF
	#define MAXBCACHEBUF MAXBSIZE /* must be a power of 2 >= MAXBSIZE */
	#endif
	#ifndef BKVASIZE
	#define BKVASIZE 16384 /* must be power of 2 */
	#endif
	#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) (((unsigned char *)(a))[(i)/NBBY] \|= 1<<((i)%NBBY))
	#define clrbit(a,i) (((unsigned char *)(a))[(i)/NBBY] &= ~(1<<((i)%NBBY)))
	#define isset(a,i) \
	(((const unsigned char *)(a))[(i)/NBBY] & (1<<((i)%NBBY)))
	#define isclr(a,i) \
	((((const unsigned char *)(a))[(i)/NBBY] & (1<<((i)%NBBY))) == 0)

	/* Macros for counting and rounding. */
	#ifndef howmany
	#define howmany(x, y) (((x)+((y)-1))/(y))
	#endif
	#define nitems(x) (sizeof((x)) / sizeof((x)[0]))
	#define rounddown(x, y) (((x)/(y))*(y))
	#define rounddown2(x, y) ((x)&(~((y)-1))) /* if y is power of two */
	#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 LOCORE
	#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
	#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 */

	/*
	* 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))

	/*
	* Old spelling of __containerof().
	*/
	#define member2struct(s, m, x) \
	((struct s )(void )((char *)(x) - offsetof(struct s, m)))

	/*
	* Access a variable length array that has been declared as a fixed
	* length array.
	*/
	#define __PAST_END(array, offset) (((__typeof__((array)) )(array))[offset])

	#endif /* _SYS_PARAM_H_ */