328 lines
11 KiB
C
328 lines
11 KiB
C
/* $NetBSD: param.h,v 1.157 2003/01/18 10:09:03 thorpej Exp $ */
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/*-
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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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*/
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#ifndef _SYS_PARAM_H_
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#define _SYS_PARAM_H_
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/*
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* Historic BSD #defines -- probably will remain untouched for all time.
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*/
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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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/*
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* #define __NetBSD_Version__ MMmmrrpp00
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*
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* M = major version
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* m = minor version
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* r = release ["",A-Z,Z[A-Z] but numeric]
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* p = patchlevel
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*
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* So:
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* NetBSD-1.2D = 102040000
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* And:
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* NetBSD-1.2.1 = 102000100
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*
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*
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* Don't forget to change conf/osrelease.sh too.
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*/
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#define __NetBSD_Version__ 106130000 /* NetBSD 1.6M */
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/*
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* Historical NetBSD #define
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*
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* NetBSD 1.4 was the last release for which this value was incremented.
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* The value is now permanently fixed at 199905. It will never be
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* changed again.
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*
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* New code must use __NetBSD_Version__ instead, and should not even
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* count on NetBSD being defined.
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*
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*/
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#define NetBSD 199905 /* NetBSD version (year & month). */
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#include <sys/null.h>
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#ifndef _LOCORE
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#include <sys/inttypes.h>
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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 64 /* max interpreter file name length */
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/* DEPRECATED: use LOGIN_NAME_MAX instead. */
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#define MAXLOGNAME (LOGIN_NAME_MAX - 1) /* max login name length */
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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 NOGROUP 65535 /* marker for empty group set member */
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#define MAXHOSTNAMELEN 256 /* max hostname size */
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#ifndef NOFILE
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#define NOFILE OPEN_MAX /* max open files per process */
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#endif
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#ifndef MAXUPRC /* max simultaneous processes */
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#define MAXUPRC CHILD_MAX /* POSIX 1003.1-compliant default */
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#else
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#if (MAXUPRC - 0) < CHILD_MAX
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#error MAXUPRC less than CHILD_MAX. See options(4) for details.
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#endif /* (MAXUPRC - 0) < CHILD_MAX */
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#endif /* !defined(MAXUPRC) */
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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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#include <sys/resource.h>
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#include <sys/ucred.h>
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#include <sys/uio.h>
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#ifndef NPROC
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#define NPROC (20 + 16 * MAXUSERS)
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#endif
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#ifndef NTEXT
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#define NTEXT (80 + NPROC / 8) /* actually the object cache */
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#endif
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#ifndef NVNODE
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#define NVNODE (NPROC + NTEXT + 100)
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#define NVNODE_IMPLICIT
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#endif
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#endif /* _KERNEL */
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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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/*
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* Stack macros. On most architectures, the stack grows down,
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* towards lower addresses; it is the rare architecture where
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* it grows up, towards higher addresses.
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*
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* STACK_GROW and STACK_SHRINK adjust a stack pointer by some
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* size, no questions asked. STACK_ALIGN aligns a stack pointer.
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*
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* STACK_ALLOC returns a pointer to allocated stack space of
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* some size; given such a pointer and a size, STACK_MAX gives
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* the maximum (in the "maxsaddr" sense) stack address of the
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* allocated memory.
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*/
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#ifdef _KERNEL
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#ifdef __MACHINE_STACK_GROWS_UP
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#define STACK_GROW(sp, _size) (((caddr_t)(sp)) + (_size))
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#define STACK_SHRINK(sp, _size) (((caddr_t)(sp)) - (_size))
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#define STACK_ALIGN(sp, bytes) \
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((caddr_t)((((unsigned long)(sp)) + (bytes)) & ~(bytes)))
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#define STACK_ALLOC(sp, _size) ((caddr_t)(sp))
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#define STACK_MAX(p, _size) (((caddr_t)(p)) + (_size))
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#else
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#define STACK_GROW(sp, _size) (((caddr_t)(sp)) - (_size))
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#define STACK_SHRINK(sp, _size) (((caddr_t)(sp)) + (_size))
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#define STACK_ALIGN(sp, bytes) \
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((caddr_t)(((unsigned long)(sp)) & ~(bytes)))
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#define STACK_ALLOC(sp, _size) (((caddr_t)(sp)) - (_size))
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#define STACK_MAX(p, _size) ((caddr_t)(p))
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#endif
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#endif /* _KERNEL */
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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 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 PNORELOCK 0x200 /* OR'd with pri for cond_wait() to not relock
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the interlock */
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#define PNOEXITERR 0x400 /* OR'd with pri for tsleep to not exit
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with an error code when LWPs are exiting */
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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 64 /* 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 - (int)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 may make some file systems unmountable.
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*/
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#ifndef MAXBSIZE /* XXX */
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#define MAXBSIZE MAXPHYS
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#endif
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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 roundup(x, y) ((((x)+((y)-1))/(y))*(y))
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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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* 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: NBPG <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and
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* MAXALLOCSAVE 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 * NBPG)
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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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/*
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* The time for a process to be blocked before being very swappable.
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* This is a number of seconds which the system takes as being a non-trivial
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* amount of real time. You probably shouldn't change this;
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* it is used in subtle ways (fractions and multiples of it are, that is, like
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* half of a ``long time'', almost a long time, etc.)
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* It is related to human patience and other factors which don't really
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* change over time.
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*/
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#define MAXSLP 20
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/*
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* Defaults for Unified Buffer Cache parameters.
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* These may be overridden in <machine/param.h>.
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*/
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#ifndef UBC_WINSHIFT
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#define UBC_WINSHIFT 13
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#endif
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#ifndef UBC_NWINS
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#define UBC_NWINS 1024
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#endif
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#ifdef _KERNEL
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/*
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* macro to convert from milliseconds to hz without integer overflow
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* Default version using only 32bits arithmetics.
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* 64bit port can define 64bit version in their <machine/param.h>
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* 0x20000 is safe for hz < 20000
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*/
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#ifndef mstohz
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#define mstohz(ms) \
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(__predict_false((ms) >= 0x20000) ? \
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((ms +0u) / 1000u) * hz : \
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((ms +0u) * hz) / 1000u)
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#endif
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#endif /* _KERNEL */
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#endif /* !_SYS_PARAM_H_ */
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