newlib-cygwin/newlib/libc/sys/rtems/include/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
 * $Id$
 */

#ifndef _SYS_PARAM_H_
#define _SYS_PARAM_H_

/* from newlib's <sys/param.h> */

#include <sys/config.h>
#include <machine/endian.h>

# define PATHSIZE (1024)

/* end of from newlib's <sys/param.h> */

#define	BSD	199506		/* System version (year & month). */
#define BSD4_3	1
#define BSD4_4	1

#ifndef NULL
#define	NULL	0
#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. */
#if defined(KERNEL) || defined(_KERNEL)
#include <sys/cdefs.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/uio.h>
#include <sys/priority.h>

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

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

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

#define	PRIMASK	0x0ff
#define	PCATCH	0x100		/* OR'd with pri for tsleep to check signals */

#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)	(((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	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. */
#if !(defined(KERNEL) || defined(_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: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and
 * MAXALLOCSIZE must be a power of two.
 */
#define MINBUCKET	4		/* 4 => min allocation of 16 bytes */
#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)

#endif	/* _SYS_PARAM_H_ */