226 lines
8.2 KiB
C
226 lines
8.2 KiB
C
/*-
|
|
* 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 8.2 (Berkeley) 1/21/94
|
|
* $Id$
|
|
*/
|
|
|
|
#ifndef _SYS_PARAM_H_
|
|
#define _SYS_PARAM_H_
|
|
|
|
#define BSD 199306 /* System version (year & month). */
|
|
#define BSD4_3 1
|
|
#define BSD4_4 1
|
|
|
|
#ifndef NULL
|
|
#define NULL 0
|
|
#endif
|
|
|
|
#ifndef LOCORE
|
|
#include "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 "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>
|
|
*/
|
|
#endif
|
|
|
|
/* Signals. */
|
|
/*#include <sys/signal.h>*/
|
|
|
|
/* Machine type dependent parameters. */
|
|
#include "param.h"
|
|
#include "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(long) /* 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 NBPG (from machine/machparam.h) pages each.
|
|
*/
|
|
#define CLBYTES (CLSIZE*NBPG)
|
|
#define CLOFSET (CLSIZE*NBPG-1) /* for clusters, like PGOFSET */
|
|
#define claligned(x) ((((long)(x))&CLOFSET)==0)
|
|
#define CLOFF CLOFSET
|
|
#define CLSHIFT (PGSHIFT+CLSIZELOG2)
|
|
|
|
#if CLSIZE==1
|
|
#define clbase(i) (i)
|
|
#define clrnd(i) (i)
|
|
#else
|
|
/* Give the base virtual address (first of CLSIZE). */
|
|
#define clbase(i) ((i) &~ (CLSIZE-1))
|
|
/* Round a number of clicks up to a whole cluster. */
|
|
#define clrnd(i) (((i) + (CLSIZE-1)) &~ (CLSIZE-1))
|
|
#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.
|
|
*/
|
|
#define MAXBSIZE MAXPHYS
|
|
#define MAXFRAG 8
|
|
|
|
/*
|
|
* MAXPATHLEN defines the longest permissable 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 8
|
|
|
|
/* 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 roundup(x, y) ((((x)+((y)-1))/(y))*(y))
|
|
#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: CLBYTES <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and
|
|
* MAXALLOCSIZE must be a power of two.
|
|
*/
|
|
#define MINBUCKET 4 /* 4 => min allocation of 16 bytes */
|
|
#define MAXALLOCSAVE (2 * CLBYTES)
|
|
|
|
/*
|
|
* 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
|