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/*-

 * 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: param.h,v 1.2 2001-09-27 12:02:00 chris Exp $

 */

#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_ */