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 * 500303 - get rid of sgtty (superseded by termios) 177 * 500304 - remove IPSEC/FAST_IPSEC 178 * 500305 - remove <sys/ioctl_compat.h> for good 179 * 500306 - strsuftoll(), strsuftollx() 180 * 500307 - tcsetsid() 181 * 500308 - xdr_uint16_t() 182 * 500309 - drop support for some ancient ioctls (OSIOCGIF*) 183 * 500310 - remove more unimplemented ioctls 184 * 500311 - add VIS_ALL to vis(3) 185 * 500312 - OpenPAM Resedacea upgrade 186 * 500313 - remove vmnet support from tap(4) (VMIO_* ioctls) 187 * 500314 - add TAPGIFNAME to tap(4) 188 * 500315 - add TUNGIFNAME to tun(4) 189 * 500316 - add SIOC[ADG]IFGROUP, SIOCGIFGMEMB ioctl 190 * 500317 - add wait6() and waitid() syscalls 191 * 500400 - 5.4 release 192 * 500500 - 5.5 development 193 * 500501 - reallocarray() added to libc 194 * 500502 - puffs etc. removed 195 * 500503 - Lowered DATA rlimit supported by mmap(), libc sbrk() emulation 196 * had to be rewritten. libc brk() removed entirely. These changes 197 * are required to allow mmap hints to utilize lowered data rlimits. 198 * 500504 - removed <sys/semaphore.h>, only <semaphore.h> remains 199 */ 200 #undef __DragonFly_version 201 #define __DragonFly_version 500504 /* propagated to newvers */ 202 203 #include <sys/_null.h> 204 205 #ifndef LOCORE 206 #include <sys/types.h> 207 #endif 208 209 /* 210 * Machine-independent constants (some used in following include files). 211 * Redefined constants are from POSIX 1003.1 limits file. 212 * 213 * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>) 214 * MAXLOGNAME should be == UT_NAMESIZE+1 (see <utmp.h>) 215 */ 216 #include <sys/syslimits.h> 217 218 #define MAXCOMLEN 16 /* max command name remembered */ 219 #define MAXINTERP 32 /* max interpreter file name length */ 220 #define MAXLOGNAME 17 /* max login name length (incl. NUL) */ 221 #define MAXUPRC CHILD_MAX /* max simultaneous processes */ 222 #define NCARGS ARG_MAX /* max bytes for an exec function */ 223 #define NGROUPS NGROUPS_MAX /* max number groups */ 224 #define NOFILE OPEN_MAX /* max open files per process */ 225 #define NOGROUP 65535 /* marker for empty group set member */ 226 #define MAXHOSTNAMELEN 256 /* max hostname size */ 227 228 /* More types and definitions used throughout the kernel. */ 229 #ifdef _KERNEL 230 #include <sys/cdefs.h> 231 #include <sys/errno.h> 232 #include <sys/time.h> 233 234 #define FALSE 0 235 #define TRUE 1 236 #endif 237 238 #ifndef _KERNEL 239 /* Signals. */ 240 #include <sys/select.h> 241 #include <sys/signal.h> 242 #endif 243 244 /* Machine type dependent parameters. */ 245 #include <machine/param.h> 246 #ifndef _KERNEL 247 #include <machine/limits.h> 248 #endif 249 250 /* 251 * WARNING! Max supported cpu's due to PWAKEUP_CPUMASK is 16384. 252 */ 253 #define PCATCH 0x00000100 /* tsleep checks signals */ 254 #define PUSRFLAG1 0x00000200 /* Subsystem specific flag */ 255 #define PINTERLOCKED 0x00000400 /* Interlocked tsleep */ 256 #define PWAKEUP_CPUMASK 0x00003FFF /* start cpu for chained wakeups */ 257 #define PWAKEUP_MYCPU 0x00004000 /* wakeup on current cpu only */ 258 #define PWAKEUP_ONE 0x00008000 /* argument to wakeup: only one */ 259 #define PDOMAIN_MASK 0xFFFF0000 /* address domains for wakeup */ 260 #define PDOMAIN_UMTX 0x00010000 /* independant domain for UMTX */ 261 #define PDOMAIN_XLOCK 0x00020000 /* independant domain for fifo_lock */ 262 #define PWAKEUP_ENCODE(domain, cpu) ((domain) | (cpu)) 263 #define PWAKEUP_DECODE(domain) ((domain) & PWAKEUP_CPUMASK) 264 265 #define NZERO 0 /* default "nice" */ 266 267 #define NBPW sizeof(int) /* number of bytes per word (integer) */ 268 269 #define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */ 270 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 271 #define NOUDEV (udev_t)(-1) /* non-existent device */ 272 #define NOMAJ 256 /* non-existent device */ 273 #endif 274 275 #ifndef _KERNEL 276 #define NODEV (dev_t)(-1) /* non-existent device */ 277 #endif 278 279 /* 280 * cpu_mi_feature bits 281 */ 282 #define CPU_MI_BZERONT 0x00000001 283 #define CPU_MI_MONITOR 0x00000010 284 285 /* 286 * File system parameters and macros. 287 * 288 * MAXBSIZE - Filesystems are made out of blocks of at most MAXBSIZE bytes 289 * per block. MAXBSIZE may be made larger without effecting 290 * any existing filesystems as long as it does not exceed MAXPHYS, 291 * and may be made smaller at the risk of not being able to use 292 * filesystems which require a block size exceeding MAXBSIZE. 293 * 294 * NBUFCALCSIZE - Calculate sufficient buffer cache buffers for the memory 295 * desired as if each buffer were sized to this value (actual 296 * real memory use). Hysteresis works both ways. 297 */ 298 #define MAXBSIZE 65536 /* must be power of 2 */ 299 #define NBUFCALCSIZE 16384 /* for nbuf calculation only */ 300 301 #define MAXFRAG 8 302 303 /* 304 * MAXPATHLEN defines the longest permissible path length after expanding 305 * symbolic links. It is used to allocate a temporary buffer from the buffer 306 * pool in which to do the name expansion, hence should be a power of two, 307 * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the 308 * maximum number of symbolic links that may be expanded in a path name. 309 * It should be set high enough to allow all legitimate uses, but halt 310 * infinite loops reasonably quickly. 311 */ 312 #define MAXPATHLEN PATH_MAX 313 #define MAXSYMLINKS 32 314 315 /* Bit map related macros. */ 316 #define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY)) 317 #define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY))) 318 #define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY))) 319 #define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0) 320 321 /* Macros for counting and rounding. */ 322 #ifndef howmany 323 #define howmany(x, y) (((x)+((y)-1))/(y)) 324 #endif 325 #define nitems(x) NELEM(x) 326 #define rounddown(x, y) (((x)/(y))*(y)) 327 #define rounddown2(x, y) ((x) & ~((y) - 1)) /* y power of two */ 328 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */ 329 #define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */ 330 #define powerof2(x) ((((x)-1)&(x))==0) 331 332 /* 333 * VM objects can be larger than the virtual address space, make sure 334 * we don't cut-off the mask. 335 */ 336 #define trunc_page64(x) ((x) & ~(int64_t)PAGE_MASK) 337 #define round_page64(x) (((x) + PAGE_MASK) & ~(int64_t)PAGE_MASK) 338 339 /* Macros for min/max. */ 340 #define MIN(a,b) (((a)<(b))?(a):(b)) 341 #define MAX(a,b) (((a)>(b))?(a):(b)) 342 343 /* Macro for array size */ 344 #define NELEM(ary) (sizeof(ary) / sizeof((ary)[0])) 345 346 /* 347 * Constants for setting the parameters of the kernel memory allocator. 348 * 349 * 2 ** MINBUCKET is the smallest unit of memory that will be 350 * allocated. It must be at least large enough to hold a pointer. 351 * 352 * Units of memory less or equal to MAXALLOCSAVE will permanently 353 * allocate physical memory; requests for these size pieces of 354 * memory are quite fast. Allocations greater than MAXALLOCSAVE must 355 * always allocate and free physical memory; requests for these 356 * size allocations should be done infrequently as they will be slow. 357 * 358 * Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and 359 * MAXALLOCSIZE must be a power of two. 360 */ 361 #define MINBUCKET 4 /* 4 => min allocation of 16 bytes */ 362 #define MAXALLOCSAVE (2 * PAGE_SIZE) 363 364 /* 365 * Scale factor for scaled integers used to count %cpu time and load avgs. 366 * 367 * The number of CPU `tick's that map to a unique `%age' can be expressed 368 * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that 369 * can be calculated (assuming 32 bits) can be closely approximated using 370 * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15). 371 * 372 * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age', 373 * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024. 374 */ 375 #define FSHIFT 11 /* bits to right of fixed binary point */ 376 #define FSCALE (1<<FSHIFT) 377 378 #define dbtoc(db) /* calculates devblks to pages */ \ 379 ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT)) 380 381 #define ctodb(db) /* calculates pages to devblks */ \ 382 ((db) << (PAGE_SHIFT - DEV_BSHIFT)) 383 384 #define MJUMPAGESIZE PAGE_SIZE /* jumbo cluster 4k */ 385 #define MJUM9BYTES (9 * 1024) /* jumbo cluster 9k */ 386 #define MJUM16BYTES (16 * 1024) /* jumbo cluster 16k */ 387 388 /* 389 * MBUF Management. 390 * 391 * Because many drivers can't deal with multiple DMA segments all mbufs 392 * must avoid crossing a page boundary. While we can accomodate mbufs 393 * which are not a power-of-2 sized kmalloc() will only guarantee 394 * non-crossing alignment if we use a power-of-2. 256 is no longer large 395 * enough due to m_hdr and m_pkthdr bloat. 396 * 397 * MCLBYTES must be a power of 2 and is typically significantly larger 398 * than MSIZE, sufficient to hold a standard-mtu packet. 2K is considered 399 * reasonable. 400 */ 401 #ifndef MSIZE 402 #define MSIZE 512 /* size of an mbuf */ 403 #endif 404 405 #ifndef MCLSHIFT 406 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 407 #endif 408 #define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */ 409 #define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */ 410 411 /* 412 * Make this available for most of the kernel. There were too many 413 * things that included sys/systm.h just for panic(). 414 */ 415 #ifdef _KERNEL 416 void panic (const char *, ...) __dead2 __printflike(1, 2); 417 #endif 418 419 #ifndef htonl 420 #define htonl(x) __htonl(x) 421 #endif 422 #ifndef htons 423 #define htons(x) __htons(x) 424 #endif 425 #ifndef ntohl 426 #define ntohl(x) __ntohl(x) 427 #endif 428 #ifndef ntohs 429 #define ntohs(x) __ntohs(x) 430 #endif 431 432 /* 433 * Access a variable length array that has been declared as a fixed 434 * length array. 435 */ 436 #define __PAST_END(array, offset) (((__typeof__(*(array)) *)(array))[offset]) 437 438 #endif /* _SYS_PARAM_H_ */ 439