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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [rtems/] [sys/] [param.h] - Blame information for rev 207

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1 207 jeremybenn
/*-
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 * Copyright (c) 1982, 1986, 1989, 1993
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 *      The Regents of the University of California.  All rights reserved.
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 * (c) UNIX System Laboratories, Inc.
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 * All or some portions of this file are derived from material licensed
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 * to the University of California by American Telephone and Telegraph
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 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
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 * the permission of UNIX System Laboratories, Inc.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 4. Neither the name of the University nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 *
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 *      @(#)param.h     8.3 (Berkeley) 4/4/95
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 * $Id: param.h 207 2010-07-19 17:43:24Z jeremybennett $
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 */
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#ifndef _SYS_PARAM_H_
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#define _SYS_PARAM_H_
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/* from newlib's <sys/param.h> */
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#include <sys/config.h>
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#include <machine/endian.h>
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# define PATHSIZE (1024)
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/* end of from newlib's <sys/param.h> */
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#include <unistd.h>
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#define BSD     199506          /* System version (year & month). */
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#define BSD4_3  1
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#define BSD4_4  1
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#ifndef NULL
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#define NULL    0
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#endif
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#ifndef LOCORE
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#include <sys/types.h>
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#endif
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/*
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 * Machine-independent constants (some used in following include files).
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 * Redefined constants are from POSIX 1003.1 limits file.
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 *
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 * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>)
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 * MAXLOGNAME should be >= UT_NAMESIZE (see <utmp.h>)
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 */
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#include <sys/syslimits.h>
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#define MAXCOMLEN       16              /* max command name remembered */
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#define MAXINTERP       32              /* max interpreter file name length */
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#define MAXLOGNAME      12              /* max login name length */
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#define MAXUPRC         CHILD_MAX       /* max simultaneous processes */
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#define NCARGS          ARG_MAX         /* max bytes for an exec function */
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#define NGROUPS         NGROUPS_MAX     /* max number groups */
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#define NOFILE          OPEN_MAX        /* max open files per process */
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#define NOGROUP         65535           /* marker for empty group set member */
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#define MAXHOSTNAMELEN  256             /* max hostname size */
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/* More types and definitions used throughout the kernel. */
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#if defined(KERNEL) || defined(_KERNEL)
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#include <sys/cdefs.h>
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#include <sys/errno.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/uio.h>
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#include <sys/priority.h>
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#ifndef FALSE
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#define FALSE   0
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#endif
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#ifndef TRUE
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#define TRUE    1
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#endif
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#endif
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/* Signals. */
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#include <sys/signal.h>
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/* Machine type dependent parameters. */
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#include <machine/param.h>
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#include <machine/limits.h>
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#define PRIMASK 0x0ff
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#define PCATCH  0x100           /* OR'd with pri for tsleep to check signals */
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#define NZERO   0                /* default "nice" */
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#define NBPW    sizeof(int)     /* number of bytes per word (integer) */
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#define CMASK   022             /* default file mask: S_IWGRP|S_IWOTH */
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#define NODEV   (dev_t)(-1)     /* non-existent device */
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#define CBLOCK  128             /* Clist block size, must be a power of 2. */
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#define CBQSIZE (CBLOCK/NBBY)   /* Quote bytes/cblock - can do better. */
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                                /* Data chars/clist. */
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#define CBSIZE  (CBLOCK - sizeof(struct cblock *) - CBQSIZE)
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#define CROUND  (CBLOCK - 1)    /* Clist rounding. */
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/*
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 * File system parameters and macros.
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 *
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 * The file system is made out of blocks of at most MAXBSIZE units, with
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 * smaller units (fragments) only in the last direct block.  MAXBSIZE
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 * primarily determines the size of buffers in the buffer pool.  It may be
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 * made larger without any effect on existing file systems; however making
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 * it smaller make make some file systems unmountable.  Also, MAXBSIZE
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 * must be less than MAXPHYS!!!  DFLTBSIZE is the average amount of
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 * memory allocated by vfs_bio per nbuf.  BKVASIZE is the average amount
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 * of kernel virtual space allocated per nbuf.  BKVASIZE should be >=
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 * DFLTBSIZE.  If it is significantly bigger than DFLTBSIZE, then
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 * kva fragmentation causes fewer performance problems.
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 */
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#define MAXBSIZE        65536
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#define BKVASIZE        8192
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#define DFLTBSIZE       4096
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#define MAXFRAG         8
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/*
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 * MAXPATHLEN defines the longest permissible path length after expanding
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 * symbolic links. It is used to allocate a temporary buffer from the buffer
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 * pool in which to do the name expansion, hence should be a power of two,
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 * and must be less than or equal to MAXBSIZE.  MAXSYMLINKS defines the
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 * maximum number of symbolic links that may be expanded in a path name.
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 * It should be set high enough to allow all legitimate uses, but halt
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 * infinite loops reasonably quickly.
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 */
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#if !defined(__rtems__)
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#define MAXPATHLEN      PATH_MAX
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#endif
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#define MAXSYMLINKS     32
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/* Bit map related macros. */
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#define setbit(a,i)     ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
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#define clrbit(a,i)     ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
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#define isset(a,i)      ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
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#define isclr(a,i)      (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
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/* Macros for counting and rounding. */
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#ifndef howmany
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#define howmany(x, y)   (((x)+((y)-1))/(y))
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#endif
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#define rounddown(x, y) (((x)/(y))*(y))
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#define roundup(x, y)   ((((x)+((y)-1))/(y))*(y))  /* to any y */
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#define roundup2(x, y)  (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */
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#define powerof2(x)     ((((x)-1)&(x))==0)
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/* Macros for min/max. */
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#if !(defined(KERNEL) || defined(_KERNEL))
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#define MIN(a,b) (((a)<(b))?(a):(b))
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#define MAX(a,b) (((a)>(b))?(a):(b))
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#endif
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/*
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 * Constants for setting the parameters of the kernel memory allocator.
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 *
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 * 2 ** MINBUCKET is the smallest unit of memory that will be
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 * allocated. It must be at least large enough to hold a pointer.
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 *
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 * Units of memory less or equal to MAXALLOCSAVE will permanently
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 * allocate physical memory; requests for these size pieces of
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 * memory are quite fast. Allocations greater than MAXALLOCSAVE must
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 * always allocate and free physical memory; requests for these
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 * size allocations should be done infrequently as they will be slow.
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 *
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 * Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and
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 * MAXALLOCSIZE must be a power of two.
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 */
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#define MINBUCKET       4               /* 4 => min allocation of 16 bytes */
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#define MAXALLOCSAVE    (2 * PAGE_SIZE)
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/*
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 * Scale factor for scaled integers used to count %cpu time and load avgs.
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 *
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 * The number of CPU `tick's that map to a unique `%age' can be expressed
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 * by the formula (1 / (2 ^ (FSHIFT - 11))).  The maximum load average that
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 * can be calculated (assuming 32 bits) can be closely approximated using
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 * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15).
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 *
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 * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age',
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 * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024.
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 */
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#define FSHIFT  11              /* bits to right of fixed binary point */
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#define FSCALE  (1<<FSHIFT)
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#endif  /* _SYS_PARAM_H_ */

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