Bump sub-versions and DragonFly_version in preparation for branching.
[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 $
6da39202 40 * $DragonFly: src/sys/sys/param.h,v 1.34 2006/07/17 00:00:03 dillon Exp $
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41 */
42
43#ifndef _SYS_PARAM_H_
44#define _SYS_PARAM_H_
45
6bb39c45 46#define BSD 200307 /* XXX kern.osrevision */
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47#define BSD4_3 1 /* XXX obsolete */
48#define BSD4_4 1 /* XXX obsolete */
984263bc 49
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50/*
51 * __DragonFly_version number. Note that the name and comment are pattern
52 * searched from conf/newvers.sh.
53 *
54 * Version changes should be documented in:
984263bc 55 * doc/en_US.ISO8859-1/books/porters-handbook/book.sgml
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56 *
57 * 150002 - MSG_F* and O_F* flags (force blocking/non-blocking operation)
6da39202 58 * 150003 - bump subvers in preparation for branching 1.6
984263bc 59 */
e9ddd87b 60#undef __DragonFly_version
6da39202 61#define __DragonFly_version 150005 /* Master, propagated to newvers */
d77e8324 62
dd146af7 63#ifdef __FreeBSD__
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64/*
65 * __FreeBSD_version numbers for source compatibility. This is temporary
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66 * along with the __FreeBSD__ define in gcc2. Note that gcc3 does not
67 * define __FreeBSD__ by default, only __DragonFly__.
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68 */
69#undef __FreeBSD_version
70#define __FreeBSD_version 480101
dd146af7 71#endif
e9ddd87b 72
984263bc 73#ifndef NULL
6bb39c45 74#define NULL 0
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75#endif
76
77#ifndef LOCORE
78#include <sys/types.h>
79#endif
80
81/*
82 * Machine-independent constants (some used in following include files).
83 * Redefined constants are from POSIX 1003.1 limits file.
84 *
85 * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>)
86 * MAXLOGNAME should be == UT_NAMESIZE+1 (see <utmp.h>)
87 */
88#include <sys/syslimits.h>
89
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90#define MAXCOMLEN 16 /* max command name remembered */
91#define MAXINTERP 32 /* max interpreter file name length */
92#define MAXLOGNAME 17 /* max login name length (incl. NUL) */
93#define MAXUPRC CHILD_MAX /* max simultaneous processes */
94#define NCARGS ARG_MAX /* max bytes for an exec function */
95#define NGROUPS NGROUPS_MAX /* max number groups */
96#define NOFILE OPEN_MAX /* max open files per process */
97#define NOGROUP 65535 /* marker for empty group set member */
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98#define MAXHOSTNAMELEN 256 /* max hostname size */
99
100/* More types and definitions used throughout the kernel. */
101#ifdef _KERNEL
102#include <sys/cdefs.h>
103#include <sys/errno.h>
104#include <sys/time.h>
105
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106#define FALSE 0
107#define TRUE 1
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108#endif
109
110#ifndef _KERNEL
111/* Signals. */
112#include <sys/signal.h>
113#endif
114
115/* Machine type dependent parameters. */
116#include <machine/param.h>
117#ifndef _KERNEL
118#include <machine/limits.h>
119#endif
120
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121#define PCATCH 0x00000100 /* tsleep checks signals */
122#define PUSRFLAG1 0x00000200 /* Subsystem specific flag */
123#define PNORESCHED 0x00000400 /* No reschedule on wakeup */
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124#define PWAKEUP_CPUMASK 0x00003FFF /* start cpu for chained wakeups */
125#define PWAKEUP_MYCPU 0x00004000 /* wakeup on current cpu only */
fc17ad60 126#define PWAKEUP_ONE 0x00008000 /* argument to wakeup: only one */
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127#define PDOMAIN_MASK 0xFFFF0000 /* address domains for wakeup */
128#define PDOMAIN_UMTX 0x00010000 /* independant domain for UMTX */
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129#define PWAKEUP_ENCODE(domain, cpu) ((domain) | (cpu))
130#define PWAKEUP_DECODE(domain) ((domain) & PWAKEUP_CPUMASK)
984263bc 131
6bb39c45 132#define NZERO 0 /* default "nice" */
984263bc 133
6bb39c45 134#define NBPW sizeof(int) /* number of bytes per word (integer) */
984263bc 135
6bb39c45 136#define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */
984263bc 137#ifdef _KERNEL
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138#define NODEV (dev_t)(-1) /* non-existent device */
139#define NOUDEV (udev_t)(-1) /* non-existent device */
140#define NOMAJ 256 /* non-existent device */
984263bc 141#else
6bb39c45 142#define NODEV (dev_t)(-1) /* non-existent device */
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143#endif
144
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145/*
146 * File system parameters and macros.
147 *
148 * MAXBSIZE - Filesystems are made out of blocks of at most MAXBSIZE bytes
149 * per block. MAXBSIZE may be made larger without effecting
150 * any existing filesystems as long as it does not exceed MAXPHYS,
151 * and may be made smaller at the risk of not being able to use
152 * filesystems which require a block size exceeding MAXBSIZE.
153 *
154 * BKVASIZE - Nominal buffer space per buffer, in bytes. BKVASIZE is the
155 * minimum KVM memory reservation the kernel is willing to make.
156 * Filesystems can of course request smaller chunks. Actual
157 * backing memory uses a chunk size of a page (PAGE_SIZE).
158 *
159 * If you make BKVASIZE too small you risk seriously fragmenting
160 * the buffer KVM map which may slow things down a bit. If you
161 * make it too big the kernel will not be able to optimally use
162 * the KVM memory reserved for the buffer cache and will wind
163 * up with too-few buffers.
164 *
165 * The default is 16384, roughly 2x the block size used by a
166 * normal UFS filesystem.
167 */
168#define MAXBSIZE 65536 /* must be power of 2 */
169#define BKVASIZE 16384 /* must be power of 2 */
170#define BKVAMASK (BKVASIZE-1)
171#define MAXFRAG 8
172
173/*
174 * MAXPATHLEN defines the longest permissible path length after expanding
175 * symbolic links. It is used to allocate a temporary buffer from the buffer
176 * pool in which to do the name expansion, hence should be a power of two,
177 * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the
178 * maximum number of symbolic links that may be expanded in a path name.
179 * It should be set high enough to allow all legitimate uses, but halt
180 * infinite loops reasonably quickly.
181 */
6bb39c45 182#define MAXPATHLEN PATH_MAX
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183#define MAXSYMLINKS 32
184
185/* Bit map related macros. */
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186#define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
187#define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
188#define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
189#define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
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190
191/* Macros for counting and rounding. */
192#ifndef howmany
6bb39c45 193#define howmany(x, y) (((x)+((y)-1))/(y))
984263bc 194#endif
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195#define rounddown(x, y) (((x)/(y))*(y))
196#define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */
197#define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */
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198#define powerof2(x) ((((x)-1)&(x))==0)
199
200/* Macros for min/max. */
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201#define MIN(a,b) (((a)<(b))?(a):(b))
202#define MAX(a,b) (((a)>(b))?(a):(b))
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203
204/*
205 * Constants for setting the parameters of the kernel memory allocator.
206 *
207 * 2 ** MINBUCKET is the smallest unit of memory that will be
208 * allocated. It must be at least large enough to hold a pointer.
209 *
210 * Units of memory less or equal to MAXALLOCSAVE will permanently
211 * allocate physical memory; requests for these size pieces of
212 * memory are quite fast. Allocations greater than MAXALLOCSAVE must
213 * always allocate and free physical memory; requests for these
214 * size allocations should be done infrequently as they will be slow.
215 *
216 * Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and
217 * MAXALLOCSIZE must be a power of two.
218 */
984263bc 219#define MINBUCKET 4 /* 4 => min allocation of 16 bytes */
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220#define MAXALLOCSAVE (2 * PAGE_SIZE)
221
222/*
223 * Scale factor for scaled integers used to count %cpu time and load avgs.
224 *
225 * The number of CPU `tick's that map to a unique `%age' can be expressed
226 * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that
227 * can be calculated (assuming 32 bits) can be closely approximated using
228 * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15).
229 *
230 * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age',
231 * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024.
232 */
6bb39c45 233#define FSHIFT 11 /* bits to right of fixed binary point */
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234#define FSCALE (1<<FSHIFT)
235
236#define dbtoc(db) /* calculates devblks to pages */ \
237 ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT))
238
239#define ctodb(db) /* calculates pages to devblks */ \
240 ((db) << (PAGE_SHIFT - DEV_BSHIFT))
241
242
243/*
244 * Make this available for most of the kernel. There were too many
245 * things that included sys/systm.h just for panic().
246 */
247#ifdef _KERNEL
b153f746 248void panic (const char *, ...) __dead2 __printflike(1, 2);
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249#endif
250
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251#ifndef htonl
252#define htonl(x) __htonl(x)
253#endif
254#ifndef htons
255#define htons(x) __htons(x)
256#endif
257#ifndef ntohl
258#define ntohl(x) __ntohl(x)
259#endif
260#ifndef ntohs
261#define ntohs(x) __ntohs(x)
262#endif
263
984263bc 264#endif /* _SYS_PARAM_H_ */