source: rtems/cpukit/libnetworking/sys/param.h @ b452a40

/*-
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 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_

#include <unistd.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>)
 * MAXLOGNAME should be >= UT_NAMESIZE (see <utmp.h>)
 */
#include <sys/syslimits.h>

#define MAXCOMLEN       16              /* max command name remembered */
#define MAXINTERP       32              /* max interpreter file name length */
#define MAXLOGNAME      12              /* max login name length */
#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 */

/* More types and definitions used throughout the kernel. */
#ifdef KERNEL
#include <sys/cdefs.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/ucred.h>
#include <sys/uio.h>
#include <sys/rtprio.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>

/*
 * Priorities.  Note that with 32 run queues, differences less than 4 are
 * insignificant.
 */
#define PSWP    0
#define PVM     4
#define PINOD   8
#define PRIBIO  16
#define PVFS    20
#define PZERO   22              /* No longer magic, shouldn't be here.  XXX */
#define PSOCK   24
#define PWAIT   32
#define PLOCK   36
#define PPAUSE  40
#define PUSER   50
#define MAXPRI  127             /* Priorities range from 0 through MAXPRI. */

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

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

#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 */

/*
 * Clustering of hardware pages on machines with ridiculously small
 * page sizes is done here.  The paging subsystem deals with units of
 * CLSIZE pte's describing PAGE_SIZE (from machine/machparam.h) pages each.
 */
#if 0
#define CLBYTES         (CLSIZE*PAGE_SIZE)
#endif

#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.
 *
 * 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.  Also, MAXBSIZE
 * must be less than MAXPHYS!!!  DFLTBSIZE is the average amount of
 * memory allocated by vfs_bio per nbuf.  BKVASIZE is the average amount
 * of kernel virtual space allocated per nbuf.  BKVASIZE should be >=
 * DFLTBSIZE.  If it is significantly bigger than DFLTBSIZE, then
 * kva fragmentation causes fewer performance problems.
 */
#define MAXBSIZE        65536
#define BKVASIZE        8192
#define DFLTBSIZE       4096
#define MAXFRAG         8

/*
 * 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.
 */
#if !defined(__rtems__)
#define MAXPATHLEN      PATH_MAX
#endif
#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. */
#ifndef 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_ */