237 lines
8.6 KiB
C
237 lines
8.6 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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,v 1.39 1999/01/21 08:29:08 dillon Exp $
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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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#undef __FreeBSD_version
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#define __FreeBSD_version 400000 /* Master, propagated to newvers */
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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+1 (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 17 /* 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 /* 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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#ifdef 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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#define FALSE 0
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#define TRUE 1
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#endif
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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 <machine/limits.h>
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#endif
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/*
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* Priorities. Note that with 32 run queues, differences less than 4 are
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* insignificant.
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*/
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#define PSWP 0
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#define PVM 4
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#define PINOD 8
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#define PRIBIO 16
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#define PVFS 20
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#define PZERO 22 /* No longer magic, shouldn't be here. XXX */
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#define PSOCK 24
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#define PWAIT 32
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#define PCONFIG 32
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#define PLOCK 36
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#define PPAUSE 40
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#define PUSER 50
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#define MAXPRI 127 /* Priorities range from 0 through MAXPRI. */
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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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/*
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* Clustering of hardware pages on machines with ridiculously small
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* page sizes is done here. The paging subsystem deals with units of
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* CLSIZE pte's describing PAGE_SIZE (from machine/machparam.h) pages each.
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*/
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#if 0
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#define CLBYTES (CLSIZE*PAGE_SIZE)
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#endif
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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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#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) ((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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#ifndef 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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#if defined(__alpha__)
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#define MINBUCKET 5 /* 5 => min allocation of 32 bytes */
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#else
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#define MINBUCKET 4 /* 4 => min allocation of 16 bytes */
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#endif
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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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#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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#endif /* _SYS_PARAM_H_ */
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