0008601042
Increase the MSIZE for RTEMS to be in line with the latest FreeBSD version. The legacy network stack of RTEMS will provides its own definition. Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>
281 lines
9.7 KiB
C
281 lines
9.7 KiB
C
/*-
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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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* 3. 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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* $FreeBSD: head/sys/sys/param.h 317383 2017-04-24 21:21:49Z brooks $
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*/
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#ifndef _SYS_PARAM_H_
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#define _SYS_PARAM_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 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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*/
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#include <sys/syslimits.h>
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#define MAXCOMLEN 19 /* max command name remembered */
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#define MAXINTERP PATH_MAX /* max interpreter file name length */
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#define MAXLOGNAME 33 /* max login name length (incl. NUL) */
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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+1) /* 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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#define SPECNAMELEN 63 /* max length of devicename */
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#ifndef _KERNEL
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/* Signals. */
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#include <sys/signal.h>
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#endif
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/* Machine type dependent parameters. */
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#include <machine/param.h>
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#ifndef _KERNEL
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#include <limits.h>
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#endif
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#ifndef DEV_BSHIFT
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#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
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#endif
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#define DEV_BSIZE (1<<DEV_BSHIFT)
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#ifndef BLKDEV_IOSIZE
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#define BLKDEV_IOSIZE PAGE_SIZE /* default block device I/O size */
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#endif
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#ifndef DFLTPHYS
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#define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */
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#endif
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#ifndef MAXPHYS
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#define MAXPHYS (128 * 1024) /* max raw I/O transfer size */
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#endif
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#ifndef MAXDUMPPGS
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#define MAXDUMPPGS (DFLTPHYS/PAGE_SIZE)
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#endif
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/*
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* Constants related to network buffer management.
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* MCLBYTES must be no larger than PAGE_SIZE.
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*/
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#ifndef MSIZE
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#define MSIZE 256 /* size of an mbuf */
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#endif
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#ifndef MCLSHIFT
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#define MCLSHIFT 11 /* convert bytes to mbuf clusters */
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#endif /* MCLSHIFT */
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#define MCLBYTES (1 << MCLSHIFT) /* size of an mbuf cluster */
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#if PAGE_SIZE < 2048
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#define MJUMPAGESIZE MCLBYTES
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#elif PAGE_SIZE <= 8192
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#define MJUMPAGESIZE PAGE_SIZE
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#else
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#define MJUMPAGESIZE (8 * 1024)
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#endif
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#define MJUM9BYTES (9 * 1024) /* jumbo cluster 9k */
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#define MJUM16BYTES (16 * 1024) /* jumbo cluster 16k */
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/*
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* Some macros for units conversion
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*/
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/* clicks to bytes */
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#ifndef ctob
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#define ctob(x) ((x)<<PAGE_SHIFT)
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#endif
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/* bytes to clicks */
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#ifndef btoc
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#define btoc(x) (((vm_offset_t)(x)+PAGE_MASK)>>PAGE_SHIFT)
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#endif
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/*
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* btodb() is messy and perhaps slow because `bytes' may be an off_t. We
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* want to shift an unsigned type to avoid sign extension and we don't
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* want to widen `bytes' unnecessarily. Assume that the result fits in
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* a daddr_t.
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*/
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#ifndef btodb
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#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
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(sizeof (bytes) > sizeof(long) \
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? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \
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: (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT))
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#endif
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#ifndef dbtob
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#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
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((off_t)(db) << DEV_BSHIFT)
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#endif
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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 PDROP 0x200 /* OR'd with pri to stop re-entry of interlock mutex */
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#define NZERO 0 /* default "nice" */
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#define NBBY 8 /* number of bits in a byte */
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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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/*
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* File system parameters and macros.
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*
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* MAXBSIZE - Filesystems are made out of blocks of at most MAXBSIZE bytes
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* per block. MAXBSIZE may be made larger without effecting
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* any existing filesystems as long as it does not exceed MAXPHYS,
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* and may be made smaller at the risk of not being able to use
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* filesystems which require a block size exceeding MAXBSIZE.
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*
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* MAXBCACHEBUF - Maximum size of a buffer in the buffer cache. This must
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* be >= MAXBSIZE and can be set differently for different
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* architectures by defining it in <machine/param.h>.
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* Making this larger allows NFS to do larger reads/writes.
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*
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* BKVASIZE - Nominal buffer space per buffer, in bytes. BKVASIZE is the
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* minimum KVM memory reservation the kernel is willing to make.
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* Filesystems can of course request smaller chunks. Actual
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* backing memory uses a chunk size of a page (PAGE_SIZE).
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* The default value here can be overridden on a per-architecture
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* basis by defining it in <machine/param.h>. This should
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* probably be done to increase its value, when MAXBCACHEBUF is
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* defined as a larger value in <machine/param.h>.
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*
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* If you make BKVASIZE too small you risk seriously fragmenting
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* the buffer KVM map which may slow things down a bit. If you
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* make it too big the kernel will not be able to optimally use
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* the KVM memory reserved for the buffer cache and will wind
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* up with too-few buffers.
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*
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* The default is 16384, roughly 2x the block size used by a
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* normal UFS filesystem.
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*/
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#define MAXBSIZE 65536 /* must be power of 2 */
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#ifndef MAXBCACHEBUF
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#define MAXBCACHEBUF MAXBSIZE /* must be a power of 2 >= MAXBSIZE */
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#endif
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#ifndef BKVASIZE
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#define BKVASIZE 16384 /* must be power of 2 */
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#endif
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#define BKVAMASK (BKVASIZE-1)
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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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#define MAXPATHLEN PATH_MAX
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#define MAXSYMLINKS 32
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/* Bit map related macros. */
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#define setbit(a,i) (((unsigned char *)(a))[(i)/NBBY] |= 1<<((i)%NBBY))
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#define clrbit(a,i) (((unsigned char *)(a))[(i)/NBBY] &= ~(1<<((i)%NBBY)))
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#define isset(a,i) \
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(((const unsigned char *)(a))[(i)/NBBY] & (1<<((i)%NBBY)))
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#define isclr(a,i) \
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((((const unsigned char *)(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 nitems(x) (sizeof((x)) / sizeof((x)[0]))
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#define rounddown(x, y) (((x)/(y))*(y))
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#define rounddown2(x, y) ((x)&(~((y)-1))) /* if y is power of two */
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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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#define MIN(a,b) (((a)<(b))?(a):(b))
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#define MAX(a,b) (((a)>(b))?(a):(b))
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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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#define dbtoc(db) /* calculates devblks to pages */ \
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((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT))
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#define ctodb(db) /* calculates pages to devblks */ \
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((db) << (PAGE_SHIFT - DEV_BSHIFT))
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/*
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* Old spelling of __containerof().
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*/
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#define member2struct(s, m, x) \
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((struct s *)(void *)((char *)(x) - offsetof(struct s, m)))
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/*
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* Access a variable length array that has been declared as a fixed
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* length array.
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*/
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#define __PAST_END(array, offset) (((__typeof__(*(array)) *)(array))[offset])
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#ifdef _KERNEL
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/* Header file provided outside of Newlib */
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#include <machine/_kernel_param.h>
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#endif
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#endif /* _SYS_PARAM_H_ */
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