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 */ 140 #undef __DragonFly_version 141 #define __DragonFly_version 400701 /* propagated to newvers */ 142 143 #include <sys/_null.h> 144 145 #ifndef LOCORE 146 #include <sys/types.h> 147 #endif 148 149 /* 150 * Machine-independent constants (some used in following include files). 151 * Redefined constants are from POSIX 1003.1 limits file. 152 * 153 * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>) 154 * MAXLOGNAME should be == UT_NAMESIZE+1 (see <utmp.h>) 155 */ 156 #include <sys/syslimits.h> 157 158 #define MAXCOMLEN 16 /* max command name remembered */ 159 #define MAXINTERP 32 /* max interpreter file name length */ 160 #define MAXLOGNAME 17 /* max login name length (incl. NUL) */ 161 #define MAXUPRC CHILD_MAX /* max simultaneous processes */ 162 #define NCARGS ARG_MAX /* max bytes for an exec function */ 163 #define NGROUPS NGROUPS_MAX /* max number groups */ 164 #define NOFILE OPEN_MAX /* max open files per process */ 165 #define NOGROUP 65535 /* marker for empty group set member */ 166 #define MAXHOSTNAMELEN 256 /* max hostname size */ 167 168 /* More types and definitions used throughout the kernel. */ 169 #ifdef _KERNEL 170 #include <sys/cdefs.h> 171 #include <sys/errno.h> 172 #include <sys/time.h> 173 174 #define FALSE 0 175 #define TRUE 1 176 #endif 177 178 #ifndef _KERNEL 179 /* Signals. */ 180 #include <sys/select.h> 181 #include <sys/signal.h> 182 #endif 183 184 /* Machine type dependent parameters. */ 185 #include <machine/param.h> 186 #ifndef _KERNEL 187 #include <machine/limits.h> 188 #endif 189 190 /* 191 * WARNING! Max supported cpu's due to PWAKEUP_CPUMASK is 16384. 192 */ 193 #define PCATCH 0x00000100 /* tsleep checks signals */ 194 #define PUSRFLAG1 0x00000200 /* Subsystem specific flag */ 195 #define PINTERLOCKED 0x00000400 /* Interlocked tsleep */ 196 #define PWAKEUP_CPUMASK 0x00003FFF /* start cpu for chained wakeups */ 197 #define PWAKEUP_MYCPU 0x00004000 /* wakeup on current cpu only */ 198 #define PWAKEUP_ONE 0x00008000 /* argument to wakeup: only one */ 199 #define PDOMAIN_MASK 0xFFFF0000 /* address domains for wakeup */ 200 #define PDOMAIN_UMTX 0x00010000 /* independant domain for UMTX */ 201 #define PDOMAIN_XLOCK 0x00020000 /* independant domain for fifo_lock */ 202 #define PWAKEUP_ENCODE(domain, cpu) ((domain) | (cpu)) 203 #define PWAKEUP_DECODE(domain) ((domain) & PWAKEUP_CPUMASK) 204 205 #define NZERO 0 /* default "nice" */ 206 207 #define NBPW sizeof(int) /* number of bytes per word (integer) */ 208 209 #define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */ 210 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 211 #define NOUDEV (udev_t)(-1) /* non-existent device */ 212 #define NOMAJ 256 /* non-existent device */ 213 #endif 214 215 #ifndef _KERNEL 216 #define NODEV (dev_t)(-1) /* non-existent device */ 217 #endif 218 219 /* 220 * cpu_mi_feature bits 221 */ 222 #define CPU_MI_BZERONT 0x00000001 223 #define CPU_MI_MONITOR 0x00000010 224 225 /* 226 * File system parameters and macros. 227 * 228 * MAXBSIZE - Filesystems are made out of blocks of at most MAXBSIZE bytes 229 * per block. MAXBSIZE may be made larger without effecting 230 * any existing filesystems as long as it does not exceed MAXPHYS, 231 * and may be made smaller at the risk of not being able to use 232 * filesystems which require a block size exceeding MAXBSIZE. 233 * 234 * NBUFCALCSIZE - Calculate sufficient buffer cache buffers for the memory 235 * desired as if each buffer were sized to this value (actual 236 * real memory use). Hysteresis works both ways. 237 */ 238 #define MAXBSIZE 65536 /* must be power of 2 */ 239 #define NBUFCALCSIZE 16384 /* for nbuf calculation only */ 240 241 #define MAXFRAG 8 242 243 /* 244 * MAXPATHLEN defines the longest permissible path length after expanding 245 * symbolic links. It is used to allocate a temporary buffer from the buffer 246 * pool in which to do the name expansion, hence should be a power of two, 247 * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the 248 * maximum number of symbolic links that may be expanded in a path name. 249 * It should be set high enough to allow all legitimate uses, but halt 250 * infinite loops reasonably quickly. 251 */ 252 #define MAXPATHLEN PATH_MAX 253 #define MAXSYMLINKS 32 254 255 /* Bit map related macros. */ 256 #define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY)) 257 #define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY))) 258 #define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY))) 259 #define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0) 260 261 /* Macros for counting and rounding. */ 262 #ifndef howmany 263 #define howmany(x, y) (((x)+((y)-1))/(y)) 264 #endif 265 #define nitems(x) (sizeof((x)) / sizeof((x)[0])) 266 #define rounddown(x, y) (((x)/(y))*(y)) 267 #define rounddown2(x, y) ((x) & ~((y) - 1)) /* y power of two */ 268 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */ 269 #define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */ 270 #define powerof2(x) ((((x)-1)&(x))==0) 271 272 /* 273 * VM objects can be larger than the virtual address space, make sure 274 * we don't cut-off the mask. 275 */ 276 #define trunc_page64(x) ((x) & ~(int64_t)PAGE_MASK) 277 #define round_page64(x) (((x) + PAGE_MASK) & ~(int64_t)PAGE_MASK) 278 279 /* Macros for min/max. */ 280 #define MIN(a,b) (((a)<(b))?(a):(b)) 281 #define MAX(a,b) (((a)>(b))?(a):(b)) 282 283 /* Macro for array size */ 284 #define NELEM(ary) (sizeof(ary) / sizeof((ary)[0])) 285 286 /* 287 * Constants for setting the parameters of the kernel memory allocator. 288 * 289 * 2 ** MINBUCKET is the smallest unit of memory that will be 290 * allocated. It must be at least large enough to hold a pointer. 291 * 292 * Units of memory less or equal to MAXALLOCSAVE will permanently 293 * allocate physical memory; requests for these size pieces of 294 * memory are quite fast. Allocations greater than MAXALLOCSAVE must 295 * always allocate and free physical memory; requests for these 296 * size allocations should be done infrequently as they will be slow. 297 * 298 * Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and 299 * MAXALLOCSIZE must be a power of two. 300 */ 301 #define MINBUCKET 4 /* 4 => min allocation of 16 bytes */ 302 #define MAXALLOCSAVE (2 * PAGE_SIZE) 303 304 /* 305 * Scale factor for scaled integers used to count %cpu time and load avgs. 306 * 307 * The number of CPU `tick's that map to a unique `%age' can be expressed 308 * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that 309 * can be calculated (assuming 32 bits) can be closely approximated using 310 * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15). 311 * 312 * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age', 313 * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024. 314 */ 315 #define FSHIFT 11 /* bits to right of fixed binary point */ 316 #define FSCALE (1<<FSHIFT) 317 318 #define dbtoc(db) /* calculates devblks to pages */ \ 319 ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT)) 320 321 #define ctodb(db) /* calculates pages to devblks */ \ 322 ((db) << (PAGE_SHIFT - DEV_BSHIFT)) 323 324 #define MJUMPAGESIZE PAGE_SIZE /* jumbo cluster 4k */ 325 #define MJUM9BYTES (9 * 1024) /* jumbo cluster 9k */ 326 #define MJUM16BYTES (16 * 1024) /* jumbo cluster 16k */ 327 328 /* 329 * MBUF Management. 330 * 331 * Because many drivers can't deal with multiple DMA segments all mbufs 332 * must avoid crossing a page boundary. While we can accomodate mbufs 333 * which are not a power-of-2 sized kmalloc() will only guarantee 334 * non-crossing alignment if we use a power-of-2. 256 is no longer large 335 * enough due to m_hdr and m_pkthdr bloat. 336 * 337 * MCLBYTES must be a power of 2 and is typically significantly larger 338 * than MSIZE, sufficient to hold a standard-mtu packet. 2K is considered 339 * reasonable. 340 */ 341 #ifndef MSIZE 342 #define MSIZE 512 /* size of an mbuf */ 343 #endif 344 345 #ifndef MCLSHIFT 346 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 347 #endif 348 #define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */ 349 #define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */ 350 351 /* 352 * Make this available for most of the kernel. There were too many 353 * things that included sys/systm.h just for panic(). 354 */ 355 #ifdef _KERNEL 356 void panic (const char *, ...) __dead2 __printflike(1, 2); 357 #endif 358 359 #ifndef htonl 360 #define htonl(x) __htonl(x) 361 #endif 362 #ifndef htons 363 #define htons(x) __htons(x) 364 #endif 365 #ifndef ntohl 366 #define ntohl(x) __ntohl(x) 367 #endif 368 #ifndef ntohs 369 #define ntohs(x) __ntohs(x) 370 #endif 371 372 /* 373 * Access a variable length array that has been declared as a fixed 374 * length array. 375 */ 376 #define __PAST_END(array, offset) (((__typeof__(*(array)) *)(array))[offset]) 377 378 #endif /* _SYS_PARAM_H_ */ 379