Cleanup remaining tsleep priority issues.
[dragonfly.git] / sys / sys / param.h
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1/*-
2 * Copyright (c) 1982, 1986, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * @(#)param.h 8.3 (Berkeley) 4/4/95
39 * $FreeBSD: src/sys/sys/param.h,v 1.61.2.38 2003/05/22 17:12:01 fjoe Exp $
2f65cd66 40 * $DragonFly: src/sys/sys/param.h,v 1.5 2003/08/01 17:46:23 dillon Exp $
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41 */
42
43#ifndef _SYS_PARAM_H_
44#define _SYS_PARAM_H_
45
46#define BSD 199506 /* System version (year & month). */
47#define BSD4_3 1
48#define BSD4_4 1
49
50/*
51 * __FreeBSD_version numbers are documented in the Porter's Handbook.
52 * If you bump the version for any reason, you should update the documentation
53 * there.
54 * Currently this lives here:
55 * doc/en_US.ISO8859-1/books/porters-handbook/book.sgml
56 */
57#undef __FreeBSD_version
58#define __FreeBSD_version 480101 /* Master, propagated to newvers */
59
60#ifndef NULL
61#define NULL 0
62#endif
63
64#ifndef LOCORE
65#include <sys/types.h>
66#endif
67
68/*
69 * Machine-independent constants (some used in following include files).
70 * Redefined constants are from POSIX 1003.1 limits file.
71 *
72 * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>)
73 * MAXLOGNAME should be == UT_NAMESIZE+1 (see <utmp.h>)
74 */
75#include <sys/syslimits.h>
76
77#define MAXCOMLEN 16 /* max command name remembered */
78#define MAXINTERP 32 /* max interpreter file name length */
79#define MAXLOGNAME 17 /* max login name length (incl. NUL) */
80#define MAXUPRC CHILD_MAX /* max simultaneous processes */
81#define NCARGS ARG_MAX /* max bytes for an exec function */
82#define NGROUPS NGROUPS_MAX /* max number groups */
83#define NOFILE OPEN_MAX /* max open files per process */
84#define NOGROUP 65535 /* marker for empty group set member */
85#define MAXHOSTNAMELEN 256 /* max hostname size */
86
87/* More types and definitions used throughout the kernel. */
88#ifdef _KERNEL
89#include <sys/cdefs.h>
90#include <sys/errno.h>
91#include <sys/time.h>
92
93#define FALSE 0
94#define TRUE 1
95#endif
96
97#ifndef _KERNEL
98/* Signals. */
99#include <sys/signal.h>
100#endif
101
102/* Machine type dependent parameters. */
103#include <machine/param.h>
104#ifndef _KERNEL
105#include <machine/limits.h>
106#endif
107
108/*
109 * Priorities. Note that with 32 run queues, differences less than 4 are
110 * insignificant.
111 */
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112#define PUSER 50
113#define MAXPRI 127 /* Priorities range from 0 through MAXPRI. */
114
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115#define PCATCH 0x0100 /* OR'd with pri for tsleep to check signals */
116#define PUSRFLAG1 0x0200 /* Subsystem specific flag */
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117
118#define NZERO 0 /* default "nice" */
119
120#define NBPW sizeof(int) /* number of bytes per word (integer) */
121
122#define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */
123#ifdef _KERNEL
124#define NODEV (dev_t)(-1) /* non-existent device */
125#define NOUDEV (udev_t)(-1) /* non-existent device */
126#define NOMAJ 256 /* non-existent device */
127#else
128#define NODEV (dev_t)(-1) /* non-existent device */
129#endif
130
131/*
132 * Clustering of hardware pages on machines with ridiculously small
133 * page sizes is done here. The paging subsystem deals with units of
134 * CLSIZE pte's describing PAGE_SIZE (from machine/machparam.h) pages each.
135 */
136#if 0
137#define CLBYTES (CLSIZE*PAGE_SIZE)
138#endif
139
140#define CBLOCK 128 /* Clist block size, must be a power of 2. */
141#define CBQSIZE (CBLOCK/NBBY) /* Quote bytes/cblock - can do better. */
142 /* Data chars/clist. */
143#define CBSIZE (CBLOCK - sizeof(struct cblock *) - CBQSIZE)
144#define CROUND (CBLOCK - 1) /* Clist rounding. */
145
146/*
147 * File system parameters and macros.
148 *
149 * MAXBSIZE - Filesystems are made out of blocks of at most MAXBSIZE bytes
150 * per block. MAXBSIZE may be made larger without effecting
151 * any existing filesystems as long as it does not exceed MAXPHYS,
152 * and may be made smaller at the risk of not being able to use
153 * filesystems which require a block size exceeding MAXBSIZE.
154 *
155 * BKVASIZE - Nominal buffer space per buffer, in bytes. BKVASIZE is the
156 * minimum KVM memory reservation the kernel is willing to make.
157 * Filesystems can of course request smaller chunks. Actual
158 * backing memory uses a chunk size of a page (PAGE_SIZE).
159 *
160 * If you make BKVASIZE too small you risk seriously fragmenting
161 * the buffer KVM map which may slow things down a bit. If you
162 * make it too big the kernel will not be able to optimally use
163 * the KVM memory reserved for the buffer cache and will wind
164 * up with too-few buffers.
165 *
166 * The default is 16384, roughly 2x the block size used by a
167 * normal UFS filesystem.
168 */
169#define MAXBSIZE 65536 /* must be power of 2 */
170#define BKVASIZE 16384 /* must be power of 2 */
171#define BKVAMASK (BKVASIZE-1)
172#define MAXFRAG 8
173
174/*
175 * MAXPATHLEN defines the longest permissible path length after expanding
176 * symbolic links. It is used to allocate a temporary buffer from the buffer
177 * pool in which to do the name expansion, hence should be a power of two,
178 * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the
179 * maximum number of symbolic links that may be expanded in a path name.
180 * It should be set high enough to allow all legitimate uses, but halt
181 * infinite loops reasonably quickly.
182 */
183#define MAXPATHLEN PATH_MAX
184#define MAXSYMLINKS 32
185
186/* Bit map related macros. */
187#define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
188#define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
189#define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
190#define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
191
192/* Macros for counting and rounding. */
193#ifndef howmany
194#define howmany(x, y) (((x)+((y)-1))/(y))
195#endif
196#define rounddown(x, y) (((x)/(y))*(y))
197#define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */
198#define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */
199#define powerof2(x) ((((x)-1)&(x))==0)
200
201/* Macros for min/max. */
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202#define MIN(a,b) (((a)<(b))?(a):(b))
203#define MAX(a,b) (((a)>(b))?(a):(b))
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204
205/*
206 * Constants for setting the parameters of the kernel memory allocator.
207 *
208 * 2 ** MINBUCKET is the smallest unit of memory that will be
209 * allocated. It must be at least large enough to hold a pointer.
210 *
211 * Units of memory less or equal to MAXALLOCSAVE will permanently
212 * allocate physical memory; requests for these size pieces of
213 * memory are quite fast. Allocations greater than MAXALLOCSAVE must
214 * always allocate and free physical memory; requests for these
215 * size allocations should be done infrequently as they will be slow.
216 *
217 * Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and
218 * MAXALLOCSIZE must be a power of two.
219 */
220#if defined(__alpha__)
221#define MINBUCKET 5 /* 5 => min allocation of 32 bytes */
222#else
223#define MINBUCKET 4 /* 4 => min allocation of 16 bytes */
224#endif
225#define MAXALLOCSAVE (2 * PAGE_SIZE)
226
227/*
228 * Scale factor for scaled integers used to count %cpu time and load avgs.
229 *
230 * The number of CPU `tick's that map to a unique `%age' can be expressed
231 * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that
232 * can be calculated (assuming 32 bits) can be closely approximated using
233 * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15).
234 *
235 * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age',
236 * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024.
237 */
238#define FSHIFT 11 /* bits to right of fixed binary point */
239#define FSCALE (1<<FSHIFT)
240
241#define dbtoc(db) /* calculates devblks to pages */ \
242 ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT))
243
244#define ctodb(db) /* calculates pages to devblks */ \
245 ((db) << (PAGE_SHIFT - DEV_BSHIFT))
246
247
248/*
249 * Make this available for most of the kernel. There were too many
250 * things that included sys/systm.h just for panic().
251 */
252#ifdef _KERNEL
253void panic __P((const char *, ...)) __dead2 __printflike(1, 2);
254#endif
255
256#endif /* _SYS_PARAM_H_ */