xref: /freebsd/sys/sys/param.h (revision 148a8da8)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 1982, 1986, 1989, 1993
5  *	The Regents of the University of California.  All rights reserved.
6  * (c) UNIX System Laboratories, Inc.
7  * All or some portions of this file are derived from material licensed
8  * to the University of California by American Telephone and Telegraph
9  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10  * the permission of UNIX System Laboratories, Inc.
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  * 1. Redistributions of source code must retain the above copyright
16  *    notice, this list of conditions and the following disclaimer.
17  * 2. Redistributions in binary form must reproduce the above copyright
18  *    notice, this list of conditions and the following disclaimer in the
19  *    documentation and/or other materials provided with the distribution.
20  * 3. Neither the name of the University nor the names of its contributors
21  *    may be used to endorse or promote products derived from this software
22  *    without specific prior written permission.
23  *
24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34  * SUCH DAMAGE.
35  *
36  *	@(#)param.h	8.3 (Berkeley) 4/4/95
37  * $FreeBSD$
38  */
39 
40 #ifndef _SYS_PARAM_H_
41 #define _SYS_PARAM_H_
42 
43 #include <sys/_null.h>
44 
45 #define	BSD	199506		/* System version (year & month). */
46 #define BSD4_3	1
47 #define BSD4_4	1
48 
49 /*
50  * __FreeBSD_version numbers are documented in the Porter's Handbook.
51  * If you bump the version for any reason, you should update the documentation
52  * there.
53  * Currently this lives here in the doc/ repository:
54  *
55  *	head/en_US.ISO8859-1/books/porters-handbook/versions/chapter.xml
56  *
57  * scheme is:  <major><two digit minor>Rxx
58  *		'R' is in the range 0 to 4 if this is a release branch or
59  *		X.0-CURRENT before releng/X.0 is created, otherwise 'R' is
60  *		in the range 5 to 9.
61  */
62 #undef __FreeBSD_version
63 #define __FreeBSD_version 1300020	/* Master, propagated to newvers */
64 
65 /*
66  * __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD,
67  * which by definition is always true on FreeBSD. This macro is also defined
68  * on other systems that use the kernel of FreeBSD, such as GNU/kFreeBSD.
69  *
70  * It is tempting to use this macro in userland code when we want to enable
71  * kernel-specific routines, and in fact it's fine to do this in code that
72  * is part of FreeBSD itself.  However, be aware that as presence of this
73  * macro is still not widespread (e.g. older FreeBSD versions, 3rd party
74  * compilers, etc), it is STRONGLY DISCOURAGED to check for this macro in
75  * external applications without also checking for __FreeBSD__ as an
76  * alternative.
77  */
78 #undef __FreeBSD_kernel__
79 #define __FreeBSD_kernel__
80 
81 #if defined(_KERNEL) || defined(IN_RTLD)
82 #define	P_OSREL_SIGWAIT			700000
83 #define	P_OSREL_SIGSEGV			700004
84 #define	P_OSREL_MAP_ANON		800104
85 #define	P_OSREL_MAP_FSTRICT		1100036
86 #define	P_OSREL_SHUTDOWN_ENOTCONN	1100077
87 #define	P_OSREL_MAP_GUARD		1200035
88 #define	P_OSREL_WRFSBASE		1200041
89 #define	P_OSREL_CK_CYLGRP		1200046
90 #define	P_OSREL_VMTOTAL64		1200054
91 #define	P_OSREL_CK_SUPERBLOCK		1300000
92 #define	P_OSREL_CK_INODE		1300005
93 
94 #define	P_OSREL_MAJOR(x)		((x) / 100000)
95 #endif
96 
97 #ifndef LOCORE
98 #include <sys/types.h>
99 #endif
100 
101 /*
102  * Machine-independent constants (some used in following include files).
103  * Redefined constants are from POSIX 1003.1 limits file.
104  *
105  * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>)
106  */
107 #include <sys/syslimits.h>
108 
109 #define	MAXCOMLEN	19		/* max command name remembered */
110 #define	MAXINTERP	PATH_MAX	/* max interpreter file name length */
111 #define	MAXLOGNAME	33		/* max login name length (incl. NUL) */
112 #define	MAXUPRC		CHILD_MAX	/* max simultaneous processes */
113 #define	NCARGS		ARG_MAX		/* max bytes for an exec function */
114 #define	NGROUPS		(NGROUPS_MAX+1)	/* max number groups */
115 #define	NOFILE		OPEN_MAX	/* max open files per process */
116 #define	NOGROUP		65535		/* marker for empty group set member */
117 #define MAXHOSTNAMELEN	256		/* max hostname size */
118 #define SPECNAMELEN	255		/* max length of devicename */
119 
120 /* More types and definitions used throughout the kernel. */
121 #ifdef _KERNEL
122 #include <sys/cdefs.h>
123 #include <sys/errno.h>
124 #ifndef LOCORE
125 #include <sys/time.h>
126 #include <sys/priority.h>
127 #endif
128 
129 #ifndef FALSE
130 #define	FALSE	0
131 #endif
132 #ifndef TRUE
133 #define	TRUE	1
134 #endif
135 #endif
136 
137 #ifndef _KERNEL
138 /* Signals. */
139 #include <sys/signal.h>
140 #endif
141 
142 /* Machine type dependent parameters. */
143 #include <machine/param.h>
144 #ifndef _KERNEL
145 #include <sys/limits.h>
146 #endif
147 
148 #ifndef DEV_BSHIFT
149 #define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
150 #endif
151 #define	DEV_BSIZE	(1<<DEV_BSHIFT)
152 
153 #ifndef BLKDEV_IOSIZE
154 #define BLKDEV_IOSIZE  PAGE_SIZE	/* default block device I/O size */
155 #endif
156 #ifndef DFLTPHYS
157 #define DFLTPHYS	(64 * 1024)	/* default max raw I/O transfer size */
158 #endif
159 #ifndef MAXPHYS
160 #define MAXPHYS		(128 * 1024)	/* max raw I/O transfer size */
161 #endif
162 #ifndef MAXDUMPPGS
163 #define MAXDUMPPGS	(DFLTPHYS/PAGE_SIZE)
164 #endif
165 
166 /*
167  * Constants related to network buffer management.
168  * MCLBYTES must be no larger than PAGE_SIZE.
169  */
170 #ifndef	MSIZE
171 #define	MSIZE		256		/* size of an mbuf */
172 #endif
173 
174 #ifndef	MCLSHIFT
175 #define MCLSHIFT	11		/* convert bytes to mbuf clusters */
176 #endif	/* MCLSHIFT */
177 
178 #define MCLBYTES	(1 << MCLSHIFT)	/* size of an mbuf cluster */
179 
180 #if PAGE_SIZE < 2048
181 #define	MJUMPAGESIZE	MCLBYTES
182 #elif PAGE_SIZE <= 8192
183 #define	MJUMPAGESIZE	PAGE_SIZE
184 #else
185 #define	MJUMPAGESIZE	(8 * 1024)
186 #endif
187 
188 #define	MJUM9BYTES	(9 * 1024)	/* jumbo cluster 9k */
189 #define	MJUM16BYTES	(16 * 1024)	/* jumbo cluster 16k */
190 
191 /*
192  * Some macros for units conversion
193  */
194 
195 /* clicks to bytes */
196 #ifndef ctob
197 #define ctob(x)	((x)<<PAGE_SHIFT)
198 #endif
199 
200 /* bytes to clicks */
201 #ifndef btoc
202 #define btoc(x)	(((vm_offset_t)(x)+PAGE_MASK)>>PAGE_SHIFT)
203 #endif
204 
205 /*
206  * btodb() is messy and perhaps slow because `bytes' may be an off_t.  We
207  * want to shift an unsigned type to avoid sign extension and we don't
208  * want to widen `bytes' unnecessarily.  Assume that the result fits in
209  * a daddr_t.
210  */
211 #ifndef btodb
212 #define btodb(bytes)	 		/* calculates (bytes / DEV_BSIZE) */ \
213 	(sizeof (bytes) > sizeof(long) \
214 	 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \
215 	 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT))
216 #endif
217 
218 #ifndef dbtob
219 #define dbtob(db)			/* calculates (db * DEV_BSIZE) */ \
220 	((off_t)(db) << DEV_BSHIFT)
221 #endif
222 
223 #define	PRIMASK	0x0ff
224 #define	PCATCH	0x100		/* OR'd with pri for tsleep to check signals */
225 #define	PDROP	0x200	/* OR'd with pri to stop re-entry of interlock mutex */
226 
227 #define	NZERO	0		/* default "nice" */
228 
229 #define	NBBY	8		/* number of bits in a byte */
230 #define	NBPW	sizeof(int)	/* number of bytes per word (integer) */
231 
232 #define	CMASK	022		/* default file mask: S_IWGRP|S_IWOTH */
233 
234 #define	NODEV	(dev_t)(-1)	/* non-existent device */
235 
236 /*
237  * File system parameters and macros.
238  *
239  * MAXBSIZE -	Filesystems are made out of blocks of at most MAXBSIZE bytes
240  *		per block.  MAXBSIZE may be made larger without effecting
241  *		any existing filesystems as long as it does not exceed MAXPHYS,
242  *		and may be made smaller at the risk of not being able to use
243  *		filesystems which require a block size exceeding MAXBSIZE.
244  *
245  * MAXBCACHEBUF - Maximum size of a buffer in the buffer cache.  This must
246  *		be >= MAXBSIZE and can be set differently for different
247  *		architectures by defining it in <machine/param.h>.
248  *		Making this larger allows NFS to do larger reads/writes.
249  *
250  * BKVASIZE -	Nominal buffer space per buffer, in bytes.  BKVASIZE is the
251  *		minimum KVM memory reservation the kernel is willing to make.
252  *		Filesystems can of course request smaller chunks.  Actual
253  *		backing memory uses a chunk size of a page (PAGE_SIZE).
254  *		The default value here can be overridden on a per-architecture
255  *		basis by defining it in <machine/param.h>.
256  *
257  *		If you make BKVASIZE too small you risk seriously fragmenting
258  *		the buffer KVM map which may slow things down a bit.  If you
259  *		make it too big the kernel will not be able to optimally use
260  *		the KVM memory reserved for the buffer cache and will wind
261  *		up with too-few buffers.
262  *
263  *		The default is 16384, roughly 2x the block size used by a
264  *		normal UFS filesystem.
265  */
266 #define MAXBSIZE	65536	/* must be power of 2 */
267 #ifndef	MAXBCACHEBUF
268 #define	MAXBCACHEBUF	MAXBSIZE /* must be a power of 2 >= MAXBSIZE */
269 #endif
270 #ifndef	BKVASIZE
271 #define BKVASIZE	16384	/* must be power of 2 */
272 #endif
273 #define BKVAMASK	(BKVASIZE-1)
274 
275 /*
276  * MAXPATHLEN defines the longest permissible path length after expanding
277  * symbolic links. It is used to allocate a temporary buffer from the buffer
278  * pool in which to do the name expansion, hence should be a power of two,
279  * and must be less than or equal to MAXBSIZE.  MAXSYMLINKS defines the
280  * maximum number of symbolic links that may be expanded in a path name.
281  * It should be set high enough to allow all legitimate uses, but halt
282  * infinite loops reasonably quickly.
283  */
284 #define	MAXPATHLEN	PATH_MAX
285 #define MAXSYMLINKS	32
286 
287 /* Bit map related macros. */
288 #define	setbit(a,i)	(((unsigned char *)(a))[(i)/NBBY] |= 1<<((i)%NBBY))
289 #define	clrbit(a,i)	(((unsigned char *)(a))[(i)/NBBY] &= ~(1<<((i)%NBBY)))
290 #define	isset(a,i)							\
291 	(((const unsigned char *)(a))[(i)/NBBY] & (1<<((i)%NBBY)))
292 #define	isclr(a,i)							\
293 	((((const unsigned char *)(a))[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
294 
295 /* Macros for counting and rounding. */
296 #ifndef howmany
297 #define	howmany(x, y)	(((x)+((y)-1))/(y))
298 #endif
299 #define	nitems(x)	(sizeof((x)) / sizeof((x)[0]))
300 #define	rounddown(x, y)	(((x)/(y))*(y))
301 #define	rounddown2(x, y) ((x)&(~((y)-1)))          /* if y is power of two */
302 #define	roundup(x, y)	((((x)+((y)-1))/(y))*(y))  /* to any y */
303 #define	roundup2(x, y)	(((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */
304 #define powerof2(x)	((((x)-1)&(x))==0)
305 
306 /* Macros for min/max. */
307 #define	MIN(a,b) (((a)<(b))?(a):(b))
308 #define	MAX(a,b) (((a)>(b))?(a):(b))
309 
310 #ifdef _KERNEL
311 /*
312  * Basic byte order function prototypes for non-inline functions.
313  */
314 #ifndef LOCORE
315 #ifndef _BYTEORDER_PROTOTYPED
316 #define	_BYTEORDER_PROTOTYPED
317 __BEGIN_DECLS
318 __uint32_t	 htonl(__uint32_t);
319 __uint16_t	 htons(__uint16_t);
320 __uint32_t	 ntohl(__uint32_t);
321 __uint16_t	 ntohs(__uint16_t);
322 __END_DECLS
323 #endif
324 #endif
325 
326 #ifndef _BYTEORDER_FUNC_DEFINED
327 #define	_BYTEORDER_FUNC_DEFINED
328 #define	htonl(x)	__htonl(x)
329 #define	htons(x)	__htons(x)
330 #define	ntohl(x)	__ntohl(x)
331 #define	ntohs(x)	__ntohs(x)
332 #endif /* !_BYTEORDER_FUNC_DEFINED */
333 #endif /* _KERNEL */
334 
335 /*
336  * Scale factor for scaled integers used to count %cpu time and load avgs.
337  *
338  * The number of CPU `tick's that map to a unique `%age' can be expressed
339  * by the formula (1 / (2 ^ (FSHIFT - 11))).  The maximum load average that
340  * can be calculated (assuming 32 bits) can be closely approximated using
341  * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15).
342  *
343  * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age',
344  * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024.
345  */
346 #define	FSHIFT	11		/* bits to right of fixed binary point */
347 #define FSCALE	(1<<FSHIFT)
348 
349 #define dbtoc(db)			/* calculates devblks to pages */ \
350 	((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT))
351 
352 #define ctodb(db)			/* calculates pages to devblks */ \
353 	((db) << (PAGE_SHIFT - DEV_BSHIFT))
354 
355 /*
356  * Old spelling of __containerof().
357  */
358 #define	member2struct(s, m, x)						\
359 	((struct s *)(void *)((char *)(x) - offsetof(struct s, m)))
360 
361 /*
362  * Access a variable length array that has been declared as a fixed
363  * length array.
364  */
365 #define __PAST_END(array, offset) (((__typeof__(*(array)) *)(array))[offset])
366 
367 #endif	/* _SYS_PARAM_H_ */
368