| 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. Neither the name of the University nor the names of its contributors |
| 19 | * may be used to endorse or promote products derived from this software |
| 20 | * without specific prior written permission. |
| 21 | * |
| 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 |
| 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 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 |
| 32 | * SUCH DAMAGE. |
| 33 | * |
| 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 $ |
| 36 | */ |
| 37 | |
| 38 | #ifndef _SYS_PARAM_H_ |
| 39 | #define _SYS_PARAM_H_ |
| 40 | |
| 41 | #define BSD 200708 /* XXX kern.osrevision */ |
| 42 | #define BSD4_3 1 /* XXX obsolete */ |
| 43 | #define BSD4_4 1 /* XXX obsolete */ |
| 44 | |
| 45 | /* |
| 46 | * __DragonFly_version number. The number doesn't really meaningfully |
| 47 | * translate to a version number. |
| 48 | * |
| 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 |
| 57 | * 200000 - 2.0 branch |
| 58 | * 200100 - base development version after 2.0 branch |
| 59 | * 200101 - lchflags syscall |
| 60 | * 200200 - 2.2 branch |
| 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 |
| 68 | * 200500 - 2.5 master |
| 69 | * 200600 - 2.6 release |
| 70 | * 200700 - 2.7 master |
| 71 | * 200800 - 2.8 release October 2010 |
| 72 | * 200900 - 2.9 master |
| 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 |
| 86 | * 300100 - 3.1 master |
| 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 |
| 91 | * 300300 - 3.3 master |
| 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 |
| 97 | * 300500 - 3.5 master |
| 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 |
| 163 | * 500000 - 5.0 release |
| 164 | * 500100 - 5.1 development |
| 165 | * 500101 - kernel ppp removal |
| 166 | * 500102 - <sys/sysref{,2}.h> inclusions removed from some public headers |
| 167 | * 500103 - faith removal |
| 168 | * 500104 - cfmakesane() |
| 169 | * 500105 - _SC_LEVEL1_DCACHE_LINESIZE sysconf() |
| 170 | * 500106 - %b and %r formats removal |
| 171 | * 500107 - <machine/apm_bios.h> removal |
| 172 | * 500200 - 5.2 release |
| 173 | * 500300 - 5.3 development |
| 174 | * 500301 - rename some public UFS constants |
| 175 | * 500302 - move IOCTLTRIM to a better header and rename it to DAIOCTRIM |
| 176 | */ |
| 177 | #undef __DragonFly_version |
| 178 | #define __DragonFly_version 500302 /* propagated to newvers */ |
| 179 | |
| 180 | #include <sys/_null.h> |
| 181 | |
| 182 | #ifndef LOCORE |
| 183 | #include <sys/types.h> |
| 184 | #endif |
| 185 | |
| 186 | /* |
| 187 | * Machine-independent constants (some used in following include files). |
| 188 | * Redefined constants are from POSIX 1003.1 limits file. |
| 189 | * |
| 190 | * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>) |
| 191 | * MAXLOGNAME should be == UT_NAMESIZE+1 (see <utmp.h>) |
| 192 | */ |
| 193 | #include <sys/syslimits.h> |
| 194 | |
| 195 | #define MAXCOMLEN 16 /* max command name remembered */ |
| 196 | #define MAXINTERP 32 /* max interpreter file name length */ |
| 197 | #define MAXLOGNAME 17 /* max login name length (incl. NUL) */ |
| 198 | #define MAXUPRC CHILD_MAX /* max simultaneous processes */ |
| 199 | #define NCARGS ARG_MAX /* max bytes for an exec function */ |
| 200 | #define NGROUPS NGROUPS_MAX /* max number groups */ |
| 201 | #define NOFILE OPEN_MAX /* max open files per process */ |
| 202 | #define NOGROUP 65535 /* marker for empty group set member */ |
| 203 | #define MAXHOSTNAMELEN 256 /* max hostname size */ |
| 204 | |
| 205 | /* More types and definitions used throughout the kernel. */ |
| 206 | #ifdef _KERNEL |
| 207 | #include <sys/cdefs.h> |
| 208 | #include <sys/errno.h> |
| 209 | #include <sys/time.h> |
| 210 | |
| 211 | #define FALSE 0 |
| 212 | #define TRUE 1 |
| 213 | #endif |
| 214 | |
| 215 | #ifndef _KERNEL |
| 216 | /* Signals. */ |
| 217 | #include <sys/select.h> |
| 218 | #include <sys/signal.h> |
| 219 | #endif |
| 220 | |
| 221 | /* Machine type dependent parameters. */ |
| 222 | #include <machine/param.h> |
| 223 | #ifndef _KERNEL |
| 224 | #include <machine/limits.h> |
| 225 | #endif |
| 226 | |
| 227 | /* |
| 228 | * WARNING! Max supported cpu's due to PWAKEUP_CPUMASK is 16384. |
| 229 | */ |
| 230 | #define PCATCH 0x00000100 /* tsleep checks signals */ |
| 231 | #define PUSRFLAG1 0x00000200 /* Subsystem specific flag */ |
| 232 | #define PINTERLOCKED 0x00000400 /* Interlocked tsleep */ |
| 233 | #define PWAKEUP_CPUMASK 0x00003FFF /* start cpu for chained wakeups */ |
| 234 | #define PWAKEUP_MYCPU 0x00004000 /* wakeup on current cpu only */ |
| 235 | #define PWAKEUP_ONE 0x00008000 /* argument to wakeup: only one */ |
| 236 | #define PDOMAIN_MASK 0xFFFF0000 /* address domains for wakeup */ |
| 237 | #define PDOMAIN_UMTX 0x00010000 /* independant domain for UMTX */ |
| 238 | #define PDOMAIN_XLOCK 0x00020000 /* independant domain for fifo_lock */ |
| 239 | #define PWAKEUP_ENCODE(domain, cpu) ((domain) | (cpu)) |
| 240 | #define PWAKEUP_DECODE(domain) ((domain) & PWAKEUP_CPUMASK) |
| 241 | |
| 242 | #define NZERO 0 /* default "nice" */ |
| 243 | |
| 244 | #define NBPW sizeof(int) /* number of bytes per word (integer) */ |
| 245 | |
| 246 | #define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */ |
| 247 | #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) |
| 248 | #define NOUDEV (udev_t)(-1) /* non-existent device */ |
| 249 | #define NOMAJ 256 /* non-existent device */ |
| 250 | #endif |
| 251 | |
| 252 | #ifndef _KERNEL |
| 253 | #define NODEV (dev_t)(-1) /* non-existent device */ |
| 254 | #endif |
| 255 | |
| 256 | /* |
| 257 | * cpu_mi_feature bits |
| 258 | */ |
| 259 | #define CPU_MI_BZERONT 0x00000001 |
| 260 | #define CPU_MI_MONITOR 0x00000010 |
| 261 | |
| 262 | /* |
| 263 | * File system parameters and macros. |
| 264 | * |
| 265 | * MAXBSIZE - Filesystems are made out of blocks of at most MAXBSIZE bytes |
| 266 | * per block. MAXBSIZE may be made larger without effecting |
| 267 | * any existing filesystems as long as it does not exceed MAXPHYS, |
| 268 | * and may be made smaller at the risk of not being able to use |
| 269 | * filesystems which require a block size exceeding MAXBSIZE. |
| 270 | * |
| 271 | * NBUFCALCSIZE - Calculate sufficient buffer cache buffers for the memory |
| 272 | * desired as if each buffer were sized to this value (actual |
| 273 | * real memory use). Hysteresis works both ways. |
| 274 | */ |
| 275 | #define MAXBSIZE 65536 /* must be power of 2 */ |
| 276 | #define NBUFCALCSIZE 16384 /* for nbuf calculation only */ |
| 277 | |
| 278 | #define MAXFRAG 8 |
| 279 | |
| 280 | /* |
| 281 | * MAXPATHLEN defines the longest permissible path length after expanding |
| 282 | * symbolic links. It is used to allocate a temporary buffer from the buffer |
| 283 | * pool in which to do the name expansion, hence should be a power of two, |
| 284 | * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the |
| 285 | * maximum number of symbolic links that may be expanded in a path name. |
| 286 | * It should be set high enough to allow all legitimate uses, but halt |
| 287 | * infinite loops reasonably quickly. |
| 288 | */ |
| 289 | #define MAXPATHLEN PATH_MAX |
| 290 | #define MAXSYMLINKS 32 |
| 291 | |
| 292 | /* Bit map related macros. */ |
| 293 | #define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY)) |
| 294 | #define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY))) |
| 295 | #define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY))) |
| 296 | #define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0) |
| 297 | |
| 298 | /* Macros for counting and rounding. */ |
| 299 | #ifndef howmany |
| 300 | #define howmany(x, y) (((x)+((y)-1))/(y)) |
| 301 | #endif |
| 302 | #define nitems(x) NELEM(x) |
| 303 | #define rounddown(x, y) (((x)/(y))*(y)) |
| 304 | #define rounddown2(x, y) ((x) & ~((y) - 1)) /* y power of two */ |
| 305 | #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */ |
| 306 | #define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */ |
| 307 | #define powerof2(x) ((((x)-1)&(x))==0) |
| 308 | |
| 309 | /* |
| 310 | * VM objects can be larger than the virtual address space, make sure |
| 311 | * we don't cut-off the mask. |
| 312 | */ |
| 313 | #define trunc_page64(x) ((x) & ~(int64_t)PAGE_MASK) |
| 314 | #define round_page64(x) (((x) + PAGE_MASK) & ~(int64_t)PAGE_MASK) |
| 315 | |
| 316 | /* Macros for min/max. */ |
| 317 | #define MIN(a,b) (((a)<(b))?(a):(b)) |
| 318 | #define MAX(a,b) (((a)>(b))?(a):(b)) |
| 319 | |
| 320 | /* Macro for array size */ |
| 321 | #define NELEM(ary) (sizeof(ary) / sizeof((ary)[0])) |
| 322 | |
| 323 | /* |
| 324 | * Constants for setting the parameters of the kernel memory allocator. |
| 325 | * |
| 326 | * 2 ** MINBUCKET is the smallest unit of memory that will be |
| 327 | * allocated. It must be at least large enough to hold a pointer. |
| 328 | * |
| 329 | * Units of memory less or equal to MAXALLOCSAVE will permanently |
| 330 | * allocate physical memory; requests for these size pieces of |
| 331 | * memory are quite fast. Allocations greater than MAXALLOCSAVE must |
| 332 | * always allocate and free physical memory; requests for these |
| 333 | * size allocations should be done infrequently as they will be slow. |
| 334 | * |
| 335 | * Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and |
| 336 | * MAXALLOCSIZE must be a power of two. |
| 337 | */ |
| 338 | #define MINBUCKET 4 /* 4 => min allocation of 16 bytes */ |
| 339 | #define MAXALLOCSAVE (2 * PAGE_SIZE) |
| 340 | |
| 341 | /* |
| 342 | * Scale factor for scaled integers used to count %cpu time and load avgs. |
| 343 | * |
| 344 | * The number of CPU `tick's that map to a unique `%age' can be expressed |
| 345 | * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that |
| 346 | * can be calculated (assuming 32 bits) can be closely approximated using |
| 347 | * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15). |
| 348 | * |
| 349 | * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age', |
| 350 | * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024. |
| 351 | */ |
| 352 | #define FSHIFT 11 /* bits to right of fixed binary point */ |
| 353 | #define FSCALE (1<<FSHIFT) |
| 354 | |
| 355 | #define dbtoc(db) /* calculates devblks to pages */ \ |
| 356 | ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT)) |
| 357 | |
| 358 | #define ctodb(db) /* calculates pages to devblks */ \ |
| 359 | ((db) << (PAGE_SHIFT - DEV_BSHIFT)) |
| 360 | |
| 361 | #define MJUMPAGESIZE PAGE_SIZE /* jumbo cluster 4k */ |
| 362 | #define MJUM9BYTES (9 * 1024) /* jumbo cluster 9k */ |
| 363 | #define MJUM16BYTES (16 * 1024) /* jumbo cluster 16k */ |
| 364 | |
| 365 | /* |
| 366 | * MBUF Management. |
| 367 | * |
| 368 | * Because many drivers can't deal with multiple DMA segments all mbufs |
| 369 | * must avoid crossing a page boundary. While we can accomodate mbufs |
| 370 | * which are not a power-of-2 sized kmalloc() will only guarantee |
| 371 | * non-crossing alignment if we use a power-of-2. 256 is no longer large |
| 372 | * enough due to m_hdr and m_pkthdr bloat. |
| 373 | * |
| 374 | * MCLBYTES must be a power of 2 and is typically significantly larger |
| 375 | * than MSIZE, sufficient to hold a standard-mtu packet. 2K is considered |
| 376 | * reasonable. |
| 377 | */ |
| 378 | #ifndef MSIZE |
| 379 | #define MSIZE 512 /* size of an mbuf */ |
| 380 | #endif |
| 381 | |
| 382 | #ifndef MCLSHIFT |
| 383 | #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ |
| 384 | #endif |
| 385 | #define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */ |
| 386 | #define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */ |
| 387 | |
| 388 | /* |
| 389 | * Make this available for most of the kernel. There were too many |
| 390 | * things that included sys/systm.h just for panic(). |
| 391 | */ |
| 392 | #ifdef _KERNEL |
| 393 | void panic (const char *, ...) __dead2 __printflike(1, 2); |
| 394 | #endif |
| 395 | |
| 396 | #ifndef htonl |
| 397 | #define htonl(x) __htonl(x) |
| 398 | #endif |
| 399 | #ifndef htons |
| 400 | #define htons(x) __htons(x) |
| 401 | #endif |
| 402 | #ifndef ntohl |
| 403 | #define ntohl(x) __ntohl(x) |
| 404 | #endif |
| 405 | #ifndef ntohs |
| 406 | #define ntohs(x) __ntohs(x) |
| 407 | #endif |
| 408 | |
| 409 | /* |
| 410 | * Access a variable length array that has been declared as a fixed |
| 411 | * length array. |
| 412 | */ |
| 413 | #define __PAST_END(array, offset) (((__typeof__(*(array)) *)(array))[offset]) |
| 414 | |
| 415 | #endif /* _SYS_PARAM_H_ */ |