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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: src/sys/sys/param.h,v 1.308.2.3 2007/12/07 23:18:42 kmacy Exp $
 */

#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:
 *
 *    doc/en_US.ISO8859-1/books/porters-handbook/book.sgml
 *
 * scheme is:  <major><two digit minor>Rxx
 *          'R' is 0 if release branch or x.0-CURRENT before RELENG_*_0
 *          is created, otherwise 1.
 */
#undef __FreeBSD_version
#define __FreeBSD_version 700055    /* Master, propagated to newvers */

#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+1 (see <utmp.h>)
 */
#include <sys/syslimits.h>

#define     MAXCOMLEN   19          /* max command name remembered */
#define     MAXINTERP   32          /* max interpreter file name length */
#define     MAXLOGNAME  17          /* 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 /* 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

#define     FALSE 0
#define     TRUE  1
#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 _NO_NAMESPACE_POLLUTION

#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      /* MSIZE */

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

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

#define     MJUMPAGESIZE      PAGE_SIZE   /* jumbo cluster 4k */
#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

#endif /* _NO_NAMESPACE_POLLUTION */

#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 */

#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. */
#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))

/*
 * Solaris compatibility definitions.
 */
#ifdef _SOLARIS_C_SOURCE
#define     PAGESIZE    PAGE_SIZE

/*
 * The OpenSolaris version is set according to the version last imported
 * from http://dlc.sun.com/osol/on/downloads/current/. In FreeBSD header
 * files it can be used to determine the level of compatibility that the
 * FreeBSD headers provide to OpenSolaris code. Perhaps one day there
 * will be a really, really Single Unix Specification.
 */
#define __OpenSolaris_version 20060731
#endif

#endif      /* _SYS_PARAM_H_ */

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