2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1982, 1986, 1989, 1993
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6 * (c) UNIX System Laboratories, Inc.
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10 * the permission of UNIX System Laboratories, Inc.
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40 #include <sys/_null.h>
42 #define BSD 199506 /* System version (year & month). */
47 * __FreeBSD_version numbers are documented in the Porter's Handbook.
48 * If you bump the version for any reason, you should update the documentation
50 * Currently this lives here in the doc/ repository:
52 * documentation/content/en/books/porters-handbook/versions/_index.adoc
54 * Encoding: <major><two digit minor>Rxx
55 * 'R' is in the range 0 to 4 if this is a release branch or
56 * X.0-CURRENT before releng/X.0 is created, otherwise 'R' is
57 * in the range 5 to 9.
60 * __FreeBSD_version is bumped every time there's a change in the base system
61 * that's noteworthy. A noteworthy change is any change which changes the
62 * kernel's KBI in -CURRENT, one that changes some detail about the system that
63 * external software (or the ports system) would want to know about, one that
64 * adds a system call, one that adds or deletes a shipped library, a security
65 * fix, or similar change not specifically noted here. Bumps should be limited
66 * to one per day / a couple per week except for security fixes.
68 * The approved way to obtain this from a shell script is:
69 * awk '/^\#define[[:space:]]*__FreeBSD_version/ {print $3}'
70 * Other methods to parse this file may work, but are not guaranteed against
71 * future changes. The above script works back to FreeBSD 3.x when this macro
72 * was introduced. This number is propagated to other places needing it that
73 * cannot include sys/param.h and should only be updated here.
75 #undef __FreeBSD_version
76 #define __FreeBSD_version 1500017
79 * __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD,
80 * which by definition is always true on FreeBSD. This macro is also defined
81 * on other systems that use the kernel of FreeBSD, such as GNU/kFreeBSD.
83 * It is tempting to use this macro in userland code when we want to enable
84 * kernel-specific routines, and in fact it's fine to do this in code that
85 * is part of FreeBSD itself. However, be aware that as presence of this
86 * macro is still not widespread (e.g. older FreeBSD versions, 3rd party
87 * compilers, etc), it is STRONGLY DISCOURAGED to check for this macro in
88 * external applications without also checking for __FreeBSD__ as an
91 #undef __FreeBSD_kernel__
92 #define __FreeBSD_kernel__
94 #if defined(_KERNEL) || defined(_WANT_P_OSREL)
95 #define P_OSREL_SIGWAIT 700000
96 #define P_OSREL_SIGSEGV 700004
97 #define P_OSREL_MAP_ANON 800104
98 #define P_OSREL_MAP_FSTRICT 1100036
99 #define P_OSREL_SHUTDOWN_ENOTCONN 1100077
100 #define P_OSREL_MAP_GUARD 1200035
101 #define P_OSREL_WRFSBASE 1200041
102 #define P_OSREL_CK_CYLGRP 1200046
103 #define P_OSREL_VMTOTAL64 1200054
104 #define P_OSREL_CK_SUPERBLOCK 1300000
105 #define P_OSREL_CK_INODE 1300005
106 #define P_OSREL_POWERPC_NEW_AUX_ARGS 1300070
107 #define P_OSREL_TIDPID 1400079
108 #define P_OSREL_ARM64_SPSR 1400084
110 #define P_OSREL_MAJOR(x) ((x) / 100000)
114 #include <sys/types.h>
118 * Machine-independent constants (some used in following include files).
119 * Redefined constants are from POSIX 1003.1 limits file.
121 * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>)
123 #include <sys/syslimits.h>
125 #define MAXCOMLEN 19 /* max command name remembered */
126 #define MAXINTERP PATH_MAX /* max interpreter file name length */
127 #define MAXLOGNAME 33 /* max login name length (incl. NUL) */
128 #define MAXUPRC CHILD_MAX /* max simultaneous processes */
129 #define NCARGS ARG_MAX /* max bytes for an exec function */
130 #define NGROUPS (NGROUPS_MAX+1) /* max number groups */
131 #define NOFILE OPEN_MAX /* max open files per process */
132 #define NOGROUP 65535 /* marker for empty group set member */
133 #define MAXHOSTNAMELEN 256 /* max hostname size */
134 #define SPECNAMELEN 255 /* max length of devicename */
136 /* More types and definitions used throughout the kernel. */
138 #include <sys/cdefs.h>
139 #include <sys/errno.h>
141 #include <sys/time.h>
142 #include <sys/priority.h>
156 #include <sys/signal.h>
160 /* Machine type dependent parameters. */
161 #include <machine/param.h>
163 #include <sys/limits.h>
167 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
169 #define DEV_BSIZE (1<<DEV_BSHIFT)
171 #ifndef BLKDEV_IOSIZE
172 #define BLKDEV_IOSIZE PAGE_SIZE /* default block device I/O size */
175 #define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */
177 #ifndef MAXPHYS /* max raw I/O transfer size */
179 #define MAXPHYS (128 * 1024)
181 #define MAXPHYS (1024 * 1024)
185 #define MAXDUMPPGS (DFLTPHYS/PAGE_SIZE)
189 * Constants related to network buffer management.
190 * MCLBYTES must be no larger than PAGE_SIZE.
193 #define MSIZE 256 /* size of an mbuf */
197 #define MCLSHIFT 11 /* convert bytes to mbuf clusters */
198 #endif /* MCLSHIFT */
200 #define MCLBYTES (1 << MCLSHIFT) /* size of an mbuf cluster */
202 #if PAGE_SIZE <= 8192
203 #define MJUMPAGESIZE PAGE_SIZE
205 #define MJUMPAGESIZE (8 * 1024)
208 #define MJUM9BYTES (9 * 1024) /* jumbo cluster 9k */
209 #define MJUM16BYTES (16 * 1024) /* jumbo cluster 16k */
212 * Some macros for units conversion
215 /* clicks to bytes */
217 #define ctob(x) ((x)<<PAGE_SHIFT)
220 /* bytes to clicks */
222 #define btoc(x) (((vm_offset_t)(x)+PAGE_MASK)>>PAGE_SHIFT)
226 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We
227 * want to shift an unsigned type to avoid sign extension and we don't
228 * want to widen `bytes' unnecessarily. Assume that the result fits in
232 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
233 (sizeof (bytes) > sizeof(long) \
234 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \
235 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT))
239 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
240 ((off_t)(db) << DEV_BSHIFT)
243 #define PRIMASK 0x0ff
244 #define PCATCH 0x100 /* OR'd with pri for tsleep to check signals */
245 #define PDROP 0x200 /* OR'd with pri to stop re-entry of interlock mutex */
246 #define PNOLOCK 0x400 /* OR'd with pri to allow sleeping w/o a lock */
247 #define PRILASTFLAG 0x400 /* Last flag defined above */
249 #define NZERO 0 /* default "nice" */
251 #define NBBY 8 /* number of bits in a byte */
252 #define NBPW sizeof(int) /* number of bytes per word (integer) */
254 #define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */
256 #define NODEV (dev_t)(-1) /* non-existent device */
259 * File system parameters and macros.
261 * MAXBSIZE - Filesystems are made out of blocks of at most MAXBSIZE bytes
262 * per block. MAXBSIZE may be made larger without effecting
263 * any existing filesystems as long as it does not exceed MAXPHYS,
264 * and may be made smaller at the risk of not being able to use
265 * filesystems which require a block size exceeding MAXBSIZE.
267 * MAXBCACHEBUF - Maximum size of a buffer in the buffer cache. This must
268 * be >= MAXBSIZE and can be set differently for different
269 * architectures by defining it in <machine/param.h>.
270 * Making this larger allows NFS to do larger reads/writes.
272 * BKVASIZE - Nominal buffer space per buffer, in bytes. BKVASIZE is the
273 * minimum KVM memory reservation the kernel is willing to make.
274 * Filesystems can of course request smaller chunks. Actual
275 * backing memory uses a chunk size of a page (PAGE_SIZE).
276 * The default value here can be overridden on a per-architecture
277 * basis by defining it in <machine/param.h>.
279 * If you make BKVASIZE too small you risk seriously fragmenting
280 * the buffer KVM map which may slow things down a bit. If you
281 * make it too big the kernel will not be able to optimally use
282 * the KVM memory reserved for the buffer cache and will wind
283 * up with too-few buffers.
285 * The default is 16384, roughly 2x the block size used by a
286 * normal UFS filesystem.
288 #define MAXBSIZE 65536 /* must be power of 2 */
290 #define MAXBCACHEBUF MAXBSIZE /* must be a power of 2 >= MAXBSIZE */
293 #define BKVASIZE 16384 /* must be power of 2 */
295 #define BKVAMASK (BKVASIZE-1)
298 * MAXPATHLEN defines the longest permissible path length after expanding
299 * symbolic links. It is used to allocate a temporary buffer from the buffer
300 * pool in which to do the name expansion, hence should be a power of two,
301 * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the
302 * maximum number of symbolic links that may be expanded in a path name.
303 * It should be set high enough to allow all legitimate uses, but halt
304 * infinite loops reasonably quickly.
306 #define MAXPATHLEN PATH_MAX
307 #define MAXSYMLINKS 32
309 /* Bit map related macros. */
310 #define setbit(a,i) (((unsigned char *)(a))[(i)/NBBY] |= 1<<((i)%NBBY))
311 #define clrbit(a,i) (((unsigned char *)(a))[(i)/NBBY] &= ~(1<<((i)%NBBY)))
313 (((const unsigned char *)(a))[(i)/NBBY] & (1<<((i)%NBBY)))
315 ((((const unsigned char *)(a))[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
317 /* Macros for counting and rounding. */
319 #define howmany(x, y) (((x)+((y)-1))/(y))
321 #define nitems(x) (sizeof((x)) / sizeof((x)[0]))
322 #define rounddown(x, y) (((x)/(y))*(y))
323 #define rounddown2(x, y) __align_down(x, y) /* if y is power of two */
324 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */
325 #define roundup2(x, y) __align_up(x, y) /* if y is powers of two */
326 #define powerof2(x) ((((x)-1)&(x))==0)
328 /* Macros for min/max. */
329 #define MIN(a,b) (((a)<(b))?(a):(b))
330 #define MAX(a,b) (((a)>(b))?(a):(b))
334 * Basic byte order function prototypes for non-inline functions.
337 #ifndef _BYTEORDER_PROTOTYPED
338 #define _BYTEORDER_PROTOTYPED
340 __uint32_t htonl(__uint32_t);
341 __uint16_t htons(__uint16_t);
342 __uint32_t ntohl(__uint32_t);
343 __uint16_t ntohs(__uint16_t);
348 #ifndef _BYTEORDER_FUNC_DEFINED
349 #define _BYTEORDER_FUNC_DEFINED
350 #define htonl(x) __htonl(x)
351 #define htons(x) __htons(x)
352 #define ntohl(x) __ntohl(x)
353 #define ntohs(x) __ntohs(x)
354 #endif /* !_BYTEORDER_FUNC_DEFINED */
358 * Scale factor for scaled integers used to count %cpu time and load avgs.
360 * The number of CPU `tick's that map to a unique `%age' can be expressed
361 * by the formula (1 / (2 ^ (FSHIFT - 11))). Since the intermediate
362 * calculation is done with 64-bit precision, the maximum load average that can
363 * be calculated is approximately 2^32 / FSCALE.
365 * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age',
366 * FSHIFT must be at least 11. This gives a maximum load avg of 2 million.
368 #define FSHIFT 11 /* bits to right of fixed binary point */
369 #define FSCALE (1<<FSHIFT)
371 #define dbtoc(db) /* calculates devblks to pages */ \
372 ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT))
374 #define ctodb(db) /* calculates pages to devblks */ \
375 ((db) << (PAGE_SHIFT - DEV_BSHIFT))
378 * Old spelling of __containerof().
380 #define member2struct(s, m, x) \
381 ((struct s *)(void *)((char *)(x) - offsetof(struct s, m)))
384 * Access a variable length array that has been declared as a fixed
387 #define __PAST_END(array, offset) (((__typeof__(*(array)) *)(array))[offset])
389 #endif /* _SYS_PARAM_H_ */