xref: /illumos-gate/usr/src/uts/common/sys/param.h (revision e913d9ec)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
/*	  All Rights Reserved  	*/

/*
 * University Copyright- Copyright (c) 1982, 1986, 1988
 * The Regents of the University of California
 * All Rights Reserved
 *
 * University Acknowledgment- Portions of this document are derived from
 * software developed by the University of California, Berkeley, and its
 * contributors.
 */

#ifndef _SYS_PARAM_H
#define	_SYS_PARAM_H

#ifndef _ASM		/* Avoid typedef headaches for assembly files */
#include <sys/types.h>
#include <sys/isa_defs.h>
#endif /* _ASM */


#ifdef	__cplusplus
extern "C" {
#endif

/*
 * Fundamental variables; don't change too often.
 */

/*
 * _POSIX_VDISABLE has historically been defined in <sys/param.h> since
 * an early merge with AT&T source.  It has also historically been defined
 * in <sys/termios.h>. The POSIX standard, IEEE Std. 1003.1-1988 initially
 * required the existence of _POSIX_VDISABLE in <sys/termios.h>.
 * Subsequent versions of the IEEE Standard as well as the X/Open
 * specifications required that _POSIX_VDISABLE be defined in <unistd.h>
 * while still allowing for it's existence in other headers.  With the
 * introduction of XPG6, _POSIX_VDISABLE can only be defined in <unistd.h>.
 */
#if !defined(_XPG6) || defined(__EXTENSIONS__)
#ifndef	_POSIX_VDISABLE
#define	_POSIX_VDISABLE 0	/* Disable special character functions */
#endif
#endif /* !defined(_XPG6) || defined(__EXTENSIONS__) */

#ifndef	MAX_INPUT
#define	MAX_INPUT	512	/* Maximum bytes stored in the input queue */
#endif

#ifndef	MAX_CANON
#define	MAX_CANON	256	/* Maximum bytes for canonical processing */
#endif

#define	UID_NOBODY	60001	/* user ID no body */
#define	GID_NOBODY	UID_NOBODY
#define	UID_UNKNOWN	96
#define	GID_UNKNOWN	UID_UNKNOWN
#define	GID_SYS		3
#define	UID_DLADM	15
#define	UID_NOACCESS	60002	/* user ID no access */

#ifdef _KERNEL
#define	MAX_TASKID	999999
#define	MAX_MAXPID	999999
#define	MAXEPHUID	0xfffffffcu	/* max ephemeral user id */

#define	FAMOUS_PID_SCHED	0
#define	FAMOUS_PID_INIT		1
#define	FAMOUS_PID_PAGEOUT	2
#define	FAMOUS_PID_FSFLUSH	3
#define	FAMOUS_PIDS		4
#endif

#ifdef DEBUG
#define	DEFAULT_MAXPID	999999
#define	DEFAULT_JUMPPID	100000
#else
#define	DEFAULT_MAXPID	30000
#define	DEFAULT_JUMPPID	0
#endif

#define	MAXUID		2147483647	/* max user id */

#define	MAXPROJID	MAXUID		/* max project id */
#define	MAXLINK		32767	/* max links */

#define	MINEPHUID	0x80000000u	/* min ephemeral user id */

#define	NMOUNT		40	/* est. of # mountable fs for quota calc */

#define	CANBSIZ		256	/* max size of typewriter line	*/

#define	NOFILE		20	/* this define is here for	*/
				/* compatibility purposes only	*/
				/* and will be removed in a	*/
				/* later release		*/

/*
 * These define the maximum and minimum allowable values of the
 * configurable parameter NGROUPS_MAX.
 */
#define	NGROUPS_UMIN	0
#define	NGROUPS_UMAX	1024
#define	NGROUPS_OLDMAX	32

/*
 * NGROUPS_MAX_DEFAULT: *MUST* match NGROUPS_MAX value in limits.h.
 * Remember that the NFS protocol must rev. before this can be increased
 */
#define	NGROUPS_MAX_DEFAULT	16

/*
 * Default process priority.  Keep it in sync with limits.h.
 */
#define	NZERO	20

/*
 * Fundamental constants of the implementation--cannot be changed easily.
 */

#define	NBPW	sizeof (int)	/* number of bytes in an integer */

#ifndef	NULL
#if defined(_LP64)
#define	NULL    0L
#else
#define	NULL	0
#endif
#endif

#define	CMASK	022		/* default mask for file creation */
#define	CDLIMIT	(1L<<11)	/* default max write address */
#define	NBPS		0x20000	/* Number of bytes per segment */
#define	NBPSCTR		512	/* Bytes per disk sector.	*/
#define	UBSIZE		512	/* unix block size.		*/
#define	SCTRSHFT	9	/* Shift for BPSECT.		*/

#ifdef _LITTLE_ENDIAN
#define	lobyte(X)	(((unsigned char *)&(X))[0])
#define	hibyte(X)	(((unsigned char *)&(X))[1])
#define	loword(X)	(((ushort_t *)&(X))[0])
#define	hiword(X)	(((ushort_t *)&(X))[1])
#endif
#ifdef _BIG_ENDIAN
#define	lobyte(X)	(((unsigned char *)&(X))[1])
#define	hibyte(X)	(((unsigned char *)&(X))[0])
#define	loword(X)	(((ushort_t *)&(X))[1])
#define	hiword(X)	(((ushort_t *)&(X))[0])
#endif

/* REMOTE -- whether machine is primary, secondary, or regular */
#define	SYSNAME 9		/* # chars in system name */
#define	PREMOTE 39

/*
 * MAXPATHLEN defines the longest permissible path length,
 * including the terminating null, after expanding symbolic links.
 * TYPICALMAXPATHLEN is used in a few places as an optimization
 * with a local buffer on the stack to avoid kmem_alloc().
 * 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.
 * MAXNAMELEN is the length (including the terminating null) of
 * the longest permissible file (component) name.
 */
#define	MAXPATHLEN	1024
#define	TYPICALMAXPATHLEN	64
#define	MAXSYMLINKS	20
#define	MAXNAMELEN	256

/*
 * MAXLINKNAMELEN defines the longest possible permitted datalink name,
 * including the terminating NUL.  Note that this must not be larger
 * than related networking constants such as LIFNAMSIZ.
 */
#define	MAXLINKNAMELEN	32

#ifndef NADDR
#define	NADDR 13
#endif

/*
 * The following are defined to be the same as
 * defined in /usr/include/limits.h.  They are
 * needed for pipe and FIFO compatibility.
 */
#ifndef PIPE_BUF	/* max # bytes atomic in write to a pipe */
#define	PIPE_BUF	5120
#endif	/* PIPE_BUF */

#ifndef PIPE_MAX	/* max # bytes written to a pipe in a write */
#define	PIPE_MAX	5120
#endif	/* PIPE_MAX */

#ifndef NBBY
#define	NBBY	8			/* number of bits per byte */
#endif

/* macros replacing interleaving functions */
#define	dkblock(bp)	((bp)->b_blkno)
#define	dkunit(bp)	(minor((bp)->b_dev) >> 3)

/*
 * 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 make make some file
 * systems unmountable.
 *
 * Note that the blocked devices are assumed to have DEV_BSIZE
 * "sectors" and that fragments must be some multiple of this size.
 */
#define	MAXBSIZE	8192
#define	DEV_BSIZE	512
#define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
#define	MAXFRAG 	8
#ifdef	_SYSCALL32
#define	MAXOFF32_T	0x7fffffff
#endif
#ifdef	_LP64
#define	MAXOFF_T	0x7fffffffffffffffl
#define	MAXOFFSET_T	0x7fffffffffffffffl
#else
#define	MAXOFF_T	0x7fffffffl
#ifdef _LONGLONG_TYPE
#define	MAXOFFSET_T 	0x7fffffffffffffffLL
#else
#define	MAXOFFSET_T	0x7fffffff
#endif
#endif	/* _LP64 */

#define	btodb(bytes)			/* calculates (bytes / DEV_BSIZE) */ \
	((unsigned long)(bytes) >> DEV_BSHIFT)
#define	dbtob(db)			/* calculates (db * DEV_BSIZE) */ \
	((unsigned long)(db) << DEV_BSHIFT)

/*	64 bit versions of btodb and dbtob */
#define	lbtodb(bytes)			/* calculates (bytes / DEV_BSIZE) */ \
	((u_offset_t)(bytes) >> DEV_BSHIFT)
#define	ldbtob(db)			/* calculates (db * DEV_BSIZE) */ \
	((u_offset_t)(db) << DEV_BSHIFT)

#ifndef _ASM	/* Avoid typedef headaches for assembly files */
#ifndef NODEV
#define	NODEV	(dev_t)(-1l)
#ifdef _SYSCALL32
#define	NODEV32	(dev32_t)(-1)
#endif	/* _SYSCALL32 */
#endif	/* NODEV */
#endif	/* _ASM */

/*
 * Size of arg list passed in by user.
 */
#define	NCARGS32	0x100000
#define	NCARGS64	0x200000
#ifdef	_LP64
#define	NCARGS		NCARGS64
#else	/* _LP64 */
#define	NCARGS		NCARGS32
#endif	/* _LP64 */

/*
 * Scale factor for scaled integers used to count
 * %cpu time and load averages.
 */
#define	FSHIFT	8		/* bits to right of fixed binary point */
#define	FSCALE	(1<<FSHIFT)

/*
 * Delay units are in microseconds.
 *
 * XXX	These macros are not part of the DDI!
 */
#if defined(_KERNEL) && !defined(_ASM)
extern void drv_usecwait(clock_t);
#define	DELAY(n)	drv_usecwait(n)
#define	CDELAY(c, n)	\
{ \
	register int N = n; \
	while (--N > 0) { \
		if (c) \
			break; \
		drv_usecwait(1); \
	} \
}
#endif	/* defined(_KERNEL) && !defined(_ASM) */

#ifdef	__cplusplus
}
#endif

/*
 * The following is to free utilities from machine dependencies within
 * an architecture. Must be included after definition of DEV_BSIZE.
 */

#if (defined(_KERNEL) || defined(_KMEMUSER))

#if defined(_MACHDEP)
#include <sys/machparam.h>
#endif

#ifdef	__cplusplus
extern "C" {
#endif

#if defined(_KERNEL) && !defined(_ASM)
extern int cpu_decay_factor;
extern pid_t maxpid;
extern pid_t jump_pid;

extern uintptr_t _kernelbase;
extern uintptr_t _userlimit;
extern uintptr_t _userlimit32;
#endif  /* defined(_KERNEL) && !defined(_ASM) */

/*
 * These three variables have been added within the #if defined(lint)
 * below to ensure visibility to lint. This is a short term workaround
 * to handle poor interaction between SS12 lint and these variables.
 * CR 6742611 has been logged to address these issues.
 */
#if defined(lint)
extern int snooping;
extern uint_t snoop_interval;
extern const unsigned int _pageshift;
#endif	/* lint */

#if !defined(_MACHDEP)

/*
 * Implementation architecture independent sections of the kernel use
 * this section.
 */
#if defined(_KERNEL) && !defined(_ASM)
extern int hz;
extern int snooping;
extern uint_t snoop_interval;
extern const unsigned long _pagesize;
extern const unsigned int _pageshift;
extern const unsigned long _pageoffset;
extern const unsigned long long _pagemask;
extern const unsigned long _mmu_pagesize;
extern const unsigned int _mmu_pageshift;
extern const unsigned long _mmu_pageoffset;
extern const unsigned long _mmu_pagemask;
extern const uintptr_t _argsbase;
extern const unsigned long _defaultstksz;
extern const unsigned int _nbpg;
extern const int _ncpu;
extern const int _clsize;
#endif	/* defined(_KERNEL) && !defined(_ASM) */

#define	PAGESIZE	_pagesize
#define	PAGESHIFT	_pageshift
#define	PAGEOFFSET	_pageoffset
#define	PAGEMASK	_pagemask
#define	MMU_PAGESIZE	_mmu_pagesize
#define	MMU_PAGESHIFT	_mmu_pageshift
#define	MMU_PAGEOFFSET	_mmu_pageoffset
#define	MMU_PAGEMASK	_mmu_pagemask

#define	KERNELBASE	_kernelbase
#define	USERLIMIT	_userlimit
#define	USERLIMIT32	_userlimit32
#define	ARGSBASE	_argsbase
#define	DEFAULTSTKSZ	_defaultstksz
#define	NCPU		_ncpu

#endif	/* defined(_MACHDEP) */

/*
 * Some random macros for units conversion.
 *
 * These are machine independent but contain constants (*PAGESHIFT) which
 * are only defined in the machine dependent file.
 */

/*
 * MMU pages to bytes, and back (with and without rounding)
 */
#define	mmu_ptob(x)	((x) << MMU_PAGESHIFT)
#define	mmu_btop(x)	(((x)) >> MMU_PAGESHIFT)
#define	mmu_btopr(x)	((((x) + MMU_PAGEOFFSET) >> MMU_PAGESHIFT))

/*
 * 2 versions of pages to disk blocks
 */
#define	mmu_ptod(x)	((x) << (MMU_PAGESHIFT - DEV_BSHIFT))
#define	ptod(x)		((x) << (PAGESHIFT - DEV_BSHIFT))

/*
 * pages to bytes, and back (with and without rounding)
 * Large Files: The explicit cast of x to unsigned int is deliberately
 * removed as part of large files work. We pass longlong values to
 * theses macros.
 *
 * Cast the input to ptob() to be a page count. This enforces 64-bit
 * math on 64-bit kernels. For 32-bit kernels, callers must explicitly
 * cast the input to be a 64-bit type if values greater than 4GB/PAGESIZE
 * are possible.
 */

#ifdef _LP64
#define	ptob(x)		(((pgcnt_t)(x)) << PAGESHIFT)
#else
#define	ptob(x)		((x) << PAGESHIFT)
#endif /* _LP64 */
#define	btop(x)		(((x) >> PAGESHIFT))
#define	btopr(x)	((((x) + PAGEOFFSET) >> PAGESHIFT))

/*
 * disk blocks to pages, rounded and truncated
 */
#define	NDPP		(PAGESIZE/DEV_BSIZE)	/* # of disk blocks per page */
#define	dtop(DD)	(((DD) + NDPP - 1) >> (PAGESHIFT - DEV_BSHIFT))
#define	dtopt(DD)	((DD) >> (PAGESHIFT - DEV_BSHIFT))

/*
 * kB to pages and back
 */
#define	kbtop(x)	((x) >> (PAGESHIFT - 10))
#define	ptokb(x)	((x) << (PAGESHIFT - 10))

/*
 * POSIX.4 related configuration parameters
 */
#define	_AIO_LISTIO_MAX		(4096)
#define	_AIO_MAX		(-1)
#define	_MQ_OPEN_MAX		(-1)
#define	_MQ_PRIO_MAX		(32)
#define	_SEM_NSEMS_MAX		INT_MAX
#define	_SEM_VALUE_MAX		INT_MAX

#ifdef	__cplusplus
}
#endif

#else	/* (defined(_KERNEL) || defined(_KMEMUSER)) */

/*
 * The following are assorted machine dependent values which can be
 * obtained in a machine independent manner through sysconf(2) or
 * sysinfo(2). In order to guarantee that these provide the expected
 * value at all times, the System Private interface (leading underscore)
 * is used.
 */

#include <sys/unistd.h>

#ifdef	__cplusplus
extern "C" {
#endif

#if !defined(_ASM)
extern long _sysconf(int);	/* System Private interface to sysconf() */
#endif	/* !defined(_ASM) */

#define	HZ		((clock_t)_sysconf(_SC_CLK_TCK))
#define	TICK		(1000000000/((clock_t)_sysconf(_SC_CLK_TCK)))
#define	PAGESIZE	(_sysconf(_SC_PAGESIZE))
#define	PAGEOFFSET	(PAGESIZE - 1)
#define	PAGEMASK	(~PAGEOFFSET)
#define	MAXPID		((pid_t)_sysconf(_SC_MAXPID))
#define	MAXEPHUID	((uid_t)_sysconf(_SC_EPHID_MAX))

#ifdef	__cplusplus
}
#endif

#endif	/* (defined(_KERNEL) || defined(_KMEMUSER)) &&  defined(_MACHDEP) */

#endif	/* _SYS_PARAM_H */