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.
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14 * notice, this list of conditions and the following disclaimer.
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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
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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
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 $
45 #define BSD 200708 /* XXX kern.osrevision */
46 #define BSD4_3 1 /* XXX obsolete */
47 #define BSD4_4 1 /* XXX obsolete */
50 * __DragonFly_version number. The number doesn't really meaningfully
51 * translate to a version number.
53 * 170000 - base development version after 1.6 branch
54 * 170001 - base development version before 1.8 branch
55 * 190000 - base development version after 1.8 branch
56 * 195000 - base development version after 1.10 branch
57 * 197500 - base development version before 1.12 branch
58 * 197600 - 1.12 branch
59 * 197700 - base development version after 1.12 branch
60 * 199900 - base development version before 2.0 branch
62 * 200100 - base development version after 2.0 branch
63 * 200101 - lchflags syscall
65 * 200201 - base development version after 2.2 branch
66 * 200202 - major changes to libc
67 * 200203 - introduce PCI domain
68 * 200204 - suser() & suser_cred() removal
69 * 200205 - devfs import
70 * 200206 - *sleep() renames
71 * 200400 - 2.4 release
73 * 200600 - 2.6 release
75 * 200800 - 2.8 release October 2010
77 * 200901 - prototype changes for alphasort(3) and scandir(3)
78 * 200902 - Xerox NS protocol removal
79 * 201000 - 2.10 release
80 * 201100 - 2.11 master
81 * 201200 - 2.12 release
82 * 201300 - 2.13 master
83 * 201301 - header rename: <vfs/gnu/ext2fs/...> -> <gnu/vfs/ext2fs/...>
84 * 201302 - header <crypt.h> is gone
85 * 201303 - <netatalk/...> and <netproto/atalk/...> are gone
86 * 201304 - Added wcscasecmp, wcsncasecmp to libc
87 * 201305 - Sync libm with NetBSD-current libm (new functions added)
88 * 201306 - Sync libm with FreeBSD-current libm (~50 new functions)
89 * 300000 - 3.0 release
91 * 300101 - i4b (ISDN) removal
92 * 300102 - <sys/ata.h> is now just a link of <sys/nata.h>
93 * 300103 - if SIG_IGN is set on SIGCHLD, do not keep zombie children
94 * 300200 - 3.2 release
96 * 300301 - Add eaccess syscall
97 * 300302 - fpsave changes - ucontext_t, mcontext_t, sigcontext, sigframe
98 * 300303 - Demarcation of old m4/flex with new m4/flex
99 * 300304 - Update to dialog-1.2-20121230
100 * 300400 - 3.4 release
101 * 300500 - 3.5 master
102 * 300501 - Convert libm to FreeBSD's version
103 * 300502 - GEM and i915 KMS support in kernel
104 * 300503 - Upgrade libiconv, locales, and associated libc functions
106 #undef __DragonFly_version
107 #define __DragonFly_version 300503 /* propagated to newvers */
109 #include <sys/_null.h>
112 #include <sys/types.h>
116 * Machine-independent constants (some used in following include files).
117 * Redefined constants are from POSIX 1003.1 limits file.
119 * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>)
120 * MAXLOGNAME should be == UT_NAMESIZE+1 (see <utmp.h>)
122 #include <sys/syslimits.h>
124 #define MAXCOMLEN 16 /* max command name remembered */
125 #define MAXINTERP 32 /* max interpreter file name length */
126 #define MAXLOGNAME 17 /* max login name length (incl. NUL) */
127 #define MAXUPRC CHILD_MAX /* max simultaneous processes */
128 #define NCARGS ARG_MAX /* max bytes for an exec function */
129 #define NGROUPS NGROUPS_MAX /* max number groups */
130 #define NOFILE OPEN_MAX /* max open files per process */
131 #define NOGROUP 65535 /* marker for empty group set member */
132 #define MAXHOSTNAMELEN 256 /* max hostname size */
134 /* More types and definitions used throughout the kernel. */
136 #include <sys/cdefs.h>
137 #include <sys/errno.h>
138 #include <sys/time.h>
146 #include <sys/select.h>
147 #include <sys/signal.h>
150 /* Machine type dependent parameters. */
151 #include <machine/param.h>
153 #include <machine/limits.h>
156 #define PCATCH 0x00000100 /* tsleep checks signals */
157 #define PUSRFLAG1 0x00000200 /* Subsystem specific flag */
158 #define PINTERLOCKED 0x00000400 /* Interlocked tsleep */
159 #define PWAKEUP_CPUMASK 0x00003FFF /* start cpu for chained wakeups */
160 #define PWAKEUP_MYCPU 0x00004000 /* wakeup on current cpu only */
161 #define PWAKEUP_ONE 0x00008000 /* argument to wakeup: only one */
162 #define PDOMAIN_MASK 0xFFFF0000 /* address domains for wakeup */
163 #define PDOMAIN_UMTX 0x00010000 /* independant domain for UMTX */
164 #define PDOMAIN_XLOCK 0x00020000 /* independant domain for fifo_lock */
165 #define PWAKEUP_ENCODE(domain, cpu) ((domain) | (cpu))
166 #define PWAKEUP_DECODE(domain) ((domain) & PWAKEUP_CPUMASK)
168 #define NZERO 0 /* default "nice" */
170 #define NBPW sizeof(int) /* number of bytes per word (integer) */
172 #define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */
173 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
174 #define NOUDEV (udev_t)(-1) /* non-existent device */
175 #define NOMAJ 256 /* non-existent device */
179 #define NODEV (dev_t)(-1) /* non-existent device */
183 * cpu_mi_feature bits
185 #define CPU_MI_BZERONT 0x00000001
186 #define CPU_MI_MONITOR 0x00000010
189 * File system parameters and macros.
191 * MAXBSIZE - Filesystems are made out of blocks of at most MAXBSIZE bytes
192 * per block. MAXBSIZE may be made larger without effecting
193 * any existing filesystems as long as it does not exceed MAXPHYS,
194 * and may be made smaller at the risk of not being able to use
195 * filesystems which require a block size exceeding MAXBSIZE.
197 * BKVASIZE - Nominal buffer space per buffer, in bytes. BKVASIZE is the
198 * minimum KVM memory reservation the kernel is willing to make.
199 * Filesystems can of course request smaller chunks. Actual
200 * backing memory uses a chunk size of a page (PAGE_SIZE).
202 * If you make BKVASIZE too small you risk seriously fragmenting
203 * the buffer KVM map which may slow things down a bit. If you
204 * make it too big the kernel will not be able to optimally use
205 * the KVM memory reserved for the buffer cache and will wind
206 * up with too-few buffers.
208 * The default is 16384, roughly 2x the block size used by a
209 * normal UFS filesystem.
211 #define MAXBSIZE 65536 /* must be power of 2 */
212 #define BKVASIZE 16384 /* must be power of 2 */
213 #define BKVAMASK (BKVASIZE-1)
217 * MAXPATHLEN defines the longest permissible path length after expanding
218 * symbolic links. It is used to allocate a temporary buffer from the buffer
219 * pool in which to do the name expansion, hence should be a power of two,
220 * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the
221 * maximum number of symbolic links that may be expanded in a path name.
222 * It should be set high enough to allow all legitimate uses, but halt
223 * infinite loops reasonably quickly.
225 #define MAXPATHLEN PATH_MAX
226 #define MAXSYMLINKS 32
228 /* Bit map related macros. */
229 #define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
230 #define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
231 #define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
232 #define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
234 /* Macros for counting and rounding. */
236 #define howmany(x, y) (((x)+((y)-1))/(y))
238 #define rounddown(x, y) (((x)/(y))*(y))
239 #define rounddown2(x, y) ((x) & ~((y) - 1)) /* y power of two */
240 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */
241 #define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */
242 #define powerof2(x) ((((x)-1)&(x))==0)
245 * VM objects can be larger than the virtual address space, make sure
246 * we don't cut-off the mask.
248 #define trunc_page64(x) ((x) & ~(int64_t)PAGE_MASK)
249 #define round_page64(x) (((x) + PAGE_MASK) & ~(int64_t)PAGE_MASK)
251 /* Macros for min/max. */
252 #define MIN(a,b) (((a)<(b))?(a):(b))
253 #define MAX(a,b) (((a)>(b))?(a):(b))
255 /* Macro for array size */
256 #define NELEM(ary) (sizeof(ary) / sizeof((ary)[0]))
259 * Constants for setting the parameters of the kernel memory allocator.
261 * 2 ** MINBUCKET is the smallest unit of memory that will be
262 * allocated. It must be at least large enough to hold a pointer.
264 * Units of memory less or equal to MAXALLOCSAVE will permanently
265 * allocate physical memory; requests for these size pieces of
266 * memory are quite fast. Allocations greater than MAXALLOCSAVE must
267 * always allocate and free physical memory; requests for these
268 * size allocations should be done infrequently as they will be slow.
270 * Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and
271 * MAXALLOCSIZE must be a power of two.
273 #define MINBUCKET 4 /* 4 => min allocation of 16 bytes */
274 #define MAXALLOCSAVE (2 * PAGE_SIZE)
277 * Scale factor for scaled integers used to count %cpu time and load avgs.
279 * The number of CPU `tick's that map to a unique `%age' can be expressed
280 * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that
281 * can be calculated (assuming 32 bits) can be closely approximated using
282 * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15).
284 * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age',
285 * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024.
287 #define FSHIFT 11 /* bits to right of fixed binary point */
288 #define FSCALE (1<<FSHIFT)
290 #define dbtoc(db) /* calculates devblks to pages */ \
291 ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT))
293 #define ctodb(db) /* calculates pages to devblks */ \
294 ((db) << (PAGE_SHIFT - DEV_BSHIFT))
296 #define MJUMPAGESIZE PAGE_SIZE /* jumbo cluster 4k */
297 #define MJUM9BYTES (9 * 1024) /* jumbo cluster 9k */
298 #define MJUM16BYTES (16 * 1024) /* jumbo cluster 16k */
303 * Because many drivers can't deal with multiple DMA segments all mbufs
304 * must avoid crossing a page boundary. While we can accomodate mbufs
305 * which are not a power-of-2 sized kmalloc() will only guarantee
306 * non-crossing alignment if we use a power-of-2. 256 is no longer large
307 * enough due to m_hdr and m_pkthdr bloat.
309 * MCLBYTES must be a power of 2 and is typically significantly larger
310 * than MSIZE, sufficient to hold a standard-mtu packet. 2K is considered
314 #define MSIZE 512 /* size of an mbuf */
318 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */
320 #define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */
321 #define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */
324 * Make this available for most of the kernel. There were too many
325 * things that included sys/systm.h just for panic().
328 void panic (const char *, ...) __dead2 __printflike(1, 2);
332 #define htonl(x) __htonl(x)
335 #define htons(x) __htons(x)
338 #define ntohl(x) __ntohl(x)
341 #define ntohs(x) __ntohs(x)
345 * Access a variable length array that has been declared as a fixed
348 #define __PAST_END(array, offset) (((__typeof__(*(array)) *)(array))[offset])
350 #endif /* _SYS_PARAM_H_ */