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
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7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
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14 * notice, this list of conditions and the following disclaimer.
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20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * @(#)param.h 8.3 (Berkeley) 4/4/95
35 * $FreeBSD: src/sys/sys/param.h,v 1.61.2.38 2003/05/22 17:12:01 fjoe Exp $
41 #define BSD 200708 /* XXX kern.osrevision */
42 #define BSD4_3 1 /* XXX obsolete */
43 #define BSD4_4 1 /* XXX obsolete */
46 * __DragonFly_version number. The number doesn't really meaningfully
47 * translate to a version number.
49 * 170000 - base development version after 1.6 branch
50 * 170001 - base development version before 1.8 branch
51 * 190000 - base development version after 1.8 branch
52 * 195000 - base development version after 1.10 branch
53 * 197500 - base development version before 1.12 branch
54 * 197600 - 1.12 branch
55 * 197700 - base development version after 1.12 branch
56 * 199900 - base development version before 2.0 branch
58 * 200100 - base development version after 2.0 branch
59 * 200101 - lchflags syscall
61 * 200201 - base development version after 2.2 branch
62 * 200202 - major changes to libc
63 * 200203 - introduce PCI domain
64 * 200204 - suser() & suser_cred() removal
65 * 200205 - devfs import
66 * 200206 - *sleep() renames
67 * 200400 - 2.4 release
69 * 200600 - 2.6 release
71 * 200800 - 2.8 release October 2010
73 * 200901 - prototype changes for alphasort(3) and scandir(3)
74 * 200902 - Xerox NS protocol removal
75 * 201000 - 2.10 release
76 * 201100 - 2.11 master
77 * 201200 - 2.12 release
78 * 201300 - 2.13 master
79 * 201301 - header rename: <vfs/gnu/ext2fs/...> -> <gnu/vfs/ext2fs/...>
80 * 201302 - header <crypt.h> is gone
81 * 201303 - <netatalk/...> and <netproto/atalk/...> are gone
82 * 201304 - Added wcscasecmp, wcsncasecmp to libc
83 * 201305 - Sync libm with NetBSD-current libm (new functions added)
84 * 201306 - Sync libm with FreeBSD-current libm (~50 new functions)
85 * 300000 - 3.0 release
87 * 300101 - i4b (ISDN) removal
88 * 300102 - <sys/ata.h> is now just a link of <sys/nata.h>
89 * 300103 - if SIG_IGN is set on SIGCHLD, do not keep zombie children
90 * 300200 - 3.2 release
92 * 300301 - Add eaccess syscall
93 * 300302 - fpsave changes - ucontext_t, mcontext_t, sigcontext, sigframe
94 * 300303 - Demarcation of old m4/flex with new m4/flex
95 * 300304 - Update to dialog-1.2-20121230
96 * 300400 - 3.4 release
98 * 300501 - Convert libm to FreeBSD's version
99 * 300502 - GEM and i915 KMS support in kernel
100 * 300503 - Upgrade libiconv, locales, and associated libc functions
101 * 300600 - 3.6 release
102 * 300700 - 3.7 master
103 * 300701 - Relocate bus/smbus/smb.h to dev/smbus/smb/smb.h
104 * 300702 - drm/i915 update
105 * 300703 - Make usb4bsd default
106 * 300704 - Removal of IPX, NCP and NWFS support
107 * 300705 - Removal of ATM support.
108 * 300800 - 3.8 release
109 * 300900 - 3.9 master
110 * 300901 - drm/i915 hardware context support added
111 * 400000 - 4.0 release
112 * 400100 - 4.1 development
113 * 400101 - Removal of SCTP support.
114 * 400102 - Sound system update from FreeBSD
115 * 400103 - Milestone - availability of gcc50 in base
116 * 400104 - struct lwp_params (a public struct) members renaming
117 * 400105 - Switch to gcc50 as the primary compiler
118 * 400106 - Added pipe2() system call
119 * 400107 - Add futimens() and utimensat() syscalls
120 * 400200 - 4.2 release
121 * 400300 - 4.3 development
122 * 400301 - posix compliant iconv (no const qualifier)
123 * 400302 - Replacement of libm with OpenBSD's libm
124 * 400303 - environ and __progname are no longer linkable symbols
125 * 400304 - Activate symbol versioning for libc.so (still on version 8)
126 * 400305 - Add accept4() system call
127 * 400306 - Add libexecinfo to base
128 * 400307 - drm/i915 kernel module renamed to i915.ko
129 * 400308 - <malloc.h> removal
130 * 400309 - Add lwp_setname() system call
131 * 400400 - 4.4 release
132 * 400500 - 4.5 development
133 * 400501 - unionfs removal
134 * 400502 - private libraries: ssh ldns edit ncurses
135 * 400503 - libarchive-3.0.2 import (add bsdcat)
136 * 400600 - 4.6 release
137 * 400700 - 4.7 development
138 * 400701 - getline() visibility changes
139 * 400702 - private library: libressl
140 * 400703 - resolved conflicts of md, crypt and ressl libraries
141 * 400704 - binutils update to 2.27
142 * 400705 - lwp_{set,get}affinity()
143 * 400706 - sched_{set,get}affinity()
144 * 400707 - pthread_{set,get}affinity_np()
145 * 400708 - lwp_create2()
146 * 400709 - pthread_attr_{set,get}affinity_np()
147 * 400710 - sched_getcpu();
148 * 400711 - move lwp syscalls to sys/lwp.h
149 * 400712 - restore lwp syscalls (except lwp_create*) declaration
150 * 400713 - add sysctl kern.cp_times
151 * 400800 - 4.8 release
152 * 400900 - 4.9 development
153 * 400901 - moved sigtramp, NX protection, sigtramp sysctl
154 * 400902 - change CPU_SETSIZE to signed; allow proc to change self affinity
155 * 400903 - malloc_type cleanup
156 * 400904 - pad rtstatistics
157 * 400905 - PTHREAD_STACK_MIN increase: 1024 => 16384
158 * 400906 - lwpid_t >=1, instead of >=0
159 * 400907 - pthread_getthreadid_np()
160 * 400908 - {clock,pthread}_getcpuclockid()
161 * 400909 - deleted ortentry, SIOC{ADD,DEL}RT, RTM_OLD{ADD,DEL}
162 * 400910 - routing table is only available on netisr_ncpus
164 #undef __DragonFly_version
165 #define __DragonFly_version 400910 /* propagated to newvers */
167 #include <sys/_null.h>
170 #include <sys/types.h>
174 * Machine-independent constants (some used in following include files).
175 * Redefined constants are from POSIX 1003.1 limits file.
177 * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>)
178 * MAXLOGNAME should be == UT_NAMESIZE+1 (see <utmp.h>)
180 #include <sys/syslimits.h>
182 #define MAXCOMLEN 16 /* max command name remembered */
183 #define MAXINTERP 32 /* max interpreter file name length */
184 #define MAXLOGNAME 17 /* max login name length (incl. NUL) */
185 #define MAXUPRC CHILD_MAX /* max simultaneous processes */
186 #define NCARGS ARG_MAX /* max bytes for an exec function */
187 #define NGROUPS NGROUPS_MAX /* max number groups */
188 #define NOFILE OPEN_MAX /* max open files per process */
189 #define NOGROUP 65535 /* marker for empty group set member */
190 #define MAXHOSTNAMELEN 256 /* max hostname size */
192 /* More types and definitions used throughout the kernel. */
194 #include <sys/cdefs.h>
195 #include <sys/errno.h>
196 #include <sys/time.h>
204 #include <sys/select.h>
205 #include <sys/signal.h>
208 /* Machine type dependent parameters. */
209 #include <machine/param.h>
211 #include <machine/limits.h>
215 * WARNING! Max supported cpu's due to PWAKEUP_CPUMASK is 16384.
217 #define PCATCH 0x00000100 /* tsleep checks signals */
218 #define PUSRFLAG1 0x00000200 /* Subsystem specific flag */
219 #define PINTERLOCKED 0x00000400 /* Interlocked tsleep */
220 #define PWAKEUP_CPUMASK 0x00003FFF /* start cpu for chained wakeups */
221 #define PWAKEUP_MYCPU 0x00004000 /* wakeup on current cpu only */
222 #define PWAKEUP_ONE 0x00008000 /* argument to wakeup: only one */
223 #define PDOMAIN_MASK 0xFFFF0000 /* address domains for wakeup */
224 #define PDOMAIN_UMTX 0x00010000 /* independant domain for UMTX */
225 #define PDOMAIN_XLOCK 0x00020000 /* independant domain for fifo_lock */
226 #define PWAKEUP_ENCODE(domain, cpu) ((domain) | (cpu))
227 #define PWAKEUP_DECODE(domain) ((domain) & PWAKEUP_CPUMASK)
229 #define NZERO 0 /* default "nice" */
231 #define NBPW sizeof(int) /* number of bytes per word (integer) */
233 #define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */
234 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
235 #define NOUDEV (udev_t)(-1) /* non-existent device */
236 #define NOMAJ 256 /* non-existent device */
240 #define NODEV (dev_t)(-1) /* non-existent device */
244 * cpu_mi_feature bits
246 #define CPU_MI_BZERONT 0x00000001
247 #define CPU_MI_MONITOR 0x00000010
250 * File system parameters and macros.
252 * MAXBSIZE - Filesystems are made out of blocks of at most MAXBSIZE bytes
253 * per block. MAXBSIZE may be made larger without effecting
254 * any existing filesystems as long as it does not exceed MAXPHYS,
255 * and may be made smaller at the risk of not being able to use
256 * filesystems which require a block size exceeding MAXBSIZE.
258 * NBUFCALCSIZE - Calculate sufficient buffer cache buffers for the memory
259 * desired as if each buffer were sized to this value (actual
260 * real memory use). Hysteresis works both ways.
262 #define MAXBSIZE 65536 /* must be power of 2 */
263 #define NBUFCALCSIZE 16384 /* for nbuf calculation only */
268 * MAXPATHLEN defines the longest permissible path length after expanding
269 * symbolic links. It is used to allocate a temporary buffer from the buffer
270 * pool in which to do the name expansion, hence should be a power of two,
271 * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the
272 * maximum number of symbolic links that may be expanded in a path name.
273 * It should be set high enough to allow all legitimate uses, but halt
274 * infinite loops reasonably quickly.
276 #define MAXPATHLEN PATH_MAX
277 #define MAXSYMLINKS 32
279 /* Bit map related macros. */
280 #define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
281 #define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
282 #define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
283 #define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
285 /* Macros for counting and rounding. */
287 #define howmany(x, y) (((x)+((y)-1))/(y))
289 #define nitems(x) (sizeof((x)) / sizeof((x)[0]))
290 #define rounddown(x, y) (((x)/(y))*(y))
291 #define rounddown2(x, y) ((x) & ~((y) - 1)) /* y power of two */
292 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */
293 #define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */
294 #define powerof2(x) ((((x)-1)&(x))==0)
297 * VM objects can be larger than the virtual address space, make sure
298 * we don't cut-off the mask.
300 #define trunc_page64(x) ((x) & ~(int64_t)PAGE_MASK)
301 #define round_page64(x) (((x) + PAGE_MASK) & ~(int64_t)PAGE_MASK)
303 /* Macros for min/max. */
304 #define MIN(a,b) (((a)<(b))?(a):(b))
305 #define MAX(a,b) (((a)>(b))?(a):(b))
307 /* Macro for array size */
308 #define NELEM(ary) (sizeof(ary) / sizeof((ary)[0]))
311 * Constants for setting the parameters of the kernel memory allocator.
313 * 2 ** MINBUCKET is the smallest unit of memory that will be
314 * allocated. It must be at least large enough to hold a pointer.
316 * Units of memory less or equal to MAXALLOCSAVE will permanently
317 * allocate physical memory; requests for these size pieces of
318 * memory are quite fast. Allocations greater than MAXALLOCSAVE must
319 * always allocate and free physical memory; requests for these
320 * size allocations should be done infrequently as they will be slow.
322 * Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and
323 * MAXALLOCSIZE must be a power of two.
325 #define MINBUCKET 4 /* 4 => min allocation of 16 bytes */
326 #define MAXALLOCSAVE (2 * PAGE_SIZE)
329 * Scale factor for scaled integers used to count %cpu time and load avgs.
331 * The number of CPU `tick's that map to a unique `%age' can be expressed
332 * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that
333 * can be calculated (assuming 32 bits) can be closely approximated using
334 * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15).
336 * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age',
337 * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024.
339 #define FSHIFT 11 /* bits to right of fixed binary point */
340 #define FSCALE (1<<FSHIFT)
342 #define dbtoc(db) /* calculates devblks to pages */ \
343 ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT))
345 #define ctodb(db) /* calculates pages to devblks */ \
346 ((db) << (PAGE_SHIFT - DEV_BSHIFT))
348 #define MJUMPAGESIZE PAGE_SIZE /* jumbo cluster 4k */
349 #define MJUM9BYTES (9 * 1024) /* jumbo cluster 9k */
350 #define MJUM16BYTES (16 * 1024) /* jumbo cluster 16k */
355 * Because many drivers can't deal with multiple DMA segments all mbufs
356 * must avoid crossing a page boundary. While we can accomodate mbufs
357 * which are not a power-of-2 sized kmalloc() will only guarantee
358 * non-crossing alignment if we use a power-of-2. 256 is no longer large
359 * enough due to m_hdr and m_pkthdr bloat.
361 * MCLBYTES must be a power of 2 and is typically significantly larger
362 * than MSIZE, sufficient to hold a standard-mtu packet. 2K is considered
366 #define MSIZE 512 /* size of an mbuf */
370 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */
372 #define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */
373 #define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */
376 * Make this available for most of the kernel. There were too many
377 * things that included sys/systm.h just for panic().
380 void panic (const char *, ...) __dead2
__printflike(1, 2);
384 #define htonl(x) __htonl(x)
387 #define htons(x) __htons(x)
390 #define ntohl(x) __ntohl(x)
393 #define ntohs(x) __ntohs(x)
397 * Access a variable length array that has been declared as a fixed
400 #define __PAST_END(array, offset) (((__typeof__(*(array)) *)(array))[offset])
402 #endif /* _SYS_PARAM_H_ */