1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)param.h 8.3 (Berkeley) 4/4/95 37 * $FreeBSD$ 38 */ 39 40 #ifndef _SYS_PARAM_H_ 41 #define _SYS_PARAM_H_ 42 43 #include <sys/_null.h> 44 45 #define BSD 199506 /* System version (year & month). */ 46 #define BSD4_3 1 47 #define BSD4_4 1 48 49 /* 50 * __FreeBSD_version numbers are documented in the Porter's Handbook. 51 * If you bump the version for any reason, you should update the documentation 52 * there. 53 * Currently this lives here in the doc/ repository: 54 * 55 * documentation/content/en/books/porters-handbook/versions/_index.adoc 56 * 57 * Encoding: <major><two digit minor>Rxx 58 * 'R' is in the range 0 to 4 if this is a release branch or 59 * X.0-CURRENT before releng/X.0 is created, otherwise 'R' is 60 * in the range 5 to 9. 61 * Short hand: MMmmXXX 62 * 63 * __FreeBSD_version is bumped every time there's a change in the base system 64 * that's noteworthy. A noteworthy change is any change which changes the 65 * kernel's KBI in -CURRENT, one that changes some detail about the system that 66 * external software (or the ports system) would want to know about, one that 67 * adds a system call, one that adds or deletes a shipped library, a security 68 * fix, or similar change not specifically noted here. Bumps should be limited 69 * to one per day / a couple per week except for security fixes. 70 * 71 * The approved way to obtain this from a shell script is: 72 * awk '/^\#define[[:space:]]*__FreeBSD_version/ {print $3}' 73 * Other methods to parse this file may work, but are not guaranteed against 74 * future changes. The above script works back to FreeBSD 3.x when this macro 75 * was introduced. This number is propagated to other places needing it that 76 * cannot include sys/param.h and should only be updated here. 77 */ 78 #undef __FreeBSD_version 79 #define __FreeBSD_version 1400053 80 81 /* 82 * __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD, 83 * which by definition is always true on FreeBSD. This macro is also defined 84 * on other systems that use the kernel of FreeBSD, such as GNU/kFreeBSD. 85 * 86 * It is tempting to use this macro in userland code when we want to enable 87 * kernel-specific routines, and in fact it's fine to do this in code that 88 * is part of FreeBSD itself. However, be aware that as presence of this 89 * macro is still not widespread (e.g. older FreeBSD versions, 3rd party 90 * compilers, etc), it is STRONGLY DISCOURAGED to check for this macro in 91 * external applications without also checking for __FreeBSD__ as an 92 * alternative. 93 */ 94 #undef __FreeBSD_kernel__ 95 #define __FreeBSD_kernel__ 96 97 #if defined(_KERNEL) || defined(IN_RTLD) 98 #define P_OSREL_SIGWAIT 700000 99 #define P_OSREL_SIGSEGV 700004 100 #define P_OSREL_MAP_ANON 800104 101 #define P_OSREL_MAP_FSTRICT 1100036 102 #define P_OSREL_SHUTDOWN_ENOTCONN 1100077 103 #define P_OSREL_MAP_GUARD 1200035 104 #define P_OSREL_WRFSBASE 1200041 105 #define P_OSREL_CK_CYLGRP 1200046 106 #define P_OSREL_VMTOTAL64 1200054 107 #define P_OSREL_CK_SUPERBLOCK 1300000 108 #define P_OSREL_CK_INODE 1300005 109 #define P_OSREL_POWERPC_NEW_AUX_ARGS 1300070 110 111 #define P_OSREL_MAJOR(x) ((x) / 100000) 112 #endif 113 114 #ifndef LOCORE 115 #include <sys/types.h> 116 #endif 117 118 /* 119 * Machine-independent constants (some used in following include files). 120 * Redefined constants are from POSIX 1003.1 limits file. 121 * 122 * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>) 123 */ 124 #include <sys/syslimits.h> 125 126 #define MAXCOMLEN 19 /* max command name remembered */ 127 #define MAXINTERP PATH_MAX /* max interpreter file name length */ 128 #define MAXLOGNAME 33 /* max login name length (incl. NUL) */ 129 #define MAXUPRC CHILD_MAX /* max simultaneous processes */ 130 #define NCARGS ARG_MAX /* max bytes for an exec function */ 131 #define NGROUPS (NGROUPS_MAX+1) /* max number groups */ 132 #define NOFILE OPEN_MAX /* max open files per process */ 133 #define NOGROUP 65535 /* marker for empty group set member */ 134 #define MAXHOSTNAMELEN 256 /* max hostname size */ 135 #define SPECNAMELEN 255 /* max length of devicename */ 136 137 /* More types and definitions used throughout the kernel. */ 138 #ifdef _KERNEL 139 #include <sys/cdefs.h> 140 #include <sys/errno.h> 141 #ifndef LOCORE 142 #include <sys/time.h> 143 #include <sys/priority.h> 144 #endif 145 146 #ifndef FALSE 147 #define FALSE 0 148 #endif 149 #ifndef TRUE 150 #define TRUE 1 151 #endif 152 #endif 153 154 #ifndef _KERNEL 155 #ifndef LOCORE 156 /* Signals. */ 157 #include <sys/signal.h> 158 #endif 159 #endif 160 161 /* Machine type dependent parameters. */ 162 #include <machine/param.h> 163 #ifndef _KERNEL 164 #include <sys/limits.h> 165 #endif 166 167 #ifndef DEV_BSHIFT 168 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 169 #endif 170 #define DEV_BSIZE (1<<DEV_BSHIFT) 171 172 #ifndef BLKDEV_IOSIZE 173 #define BLKDEV_IOSIZE PAGE_SIZE /* default block device I/O size */ 174 #endif 175 #ifndef DFLTPHYS 176 #define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */ 177 #endif 178 #ifndef MAXPHYS /* max raw I/O transfer size */ 179 #ifdef __ILP32__ 180 #define MAXPHYS (128 * 1024) 181 #else 182 #define MAXPHYS (1024 * 1024) 183 #endif 184 #endif 185 #ifndef MAXDUMPPGS 186 #define MAXDUMPPGS (DFLTPHYS/PAGE_SIZE) 187 #endif 188 189 /* 190 * Constants related to network buffer management. 191 * MCLBYTES must be no larger than PAGE_SIZE. 192 */ 193 #ifndef MSIZE 194 #define MSIZE 256 /* size of an mbuf */ 195 #endif 196 197 #ifndef MCLSHIFT 198 #define MCLSHIFT 11 /* convert bytes to mbuf clusters */ 199 #endif /* MCLSHIFT */ 200 201 #define MCLBYTES (1 << MCLSHIFT) /* size of an mbuf cluster */ 202 203 #if PAGE_SIZE < 2048 204 #define MJUMPAGESIZE MCLBYTES 205 #elif PAGE_SIZE <= 8192 206 #define MJUMPAGESIZE PAGE_SIZE 207 #else 208 #define MJUMPAGESIZE (8 * 1024) 209 #endif 210 211 #define MJUM9BYTES (9 * 1024) /* jumbo cluster 9k */ 212 #define MJUM16BYTES (16 * 1024) /* jumbo cluster 16k */ 213 214 /* 215 * Some macros for units conversion 216 */ 217 218 /* clicks to bytes */ 219 #ifndef ctob 220 #define ctob(x) ((x)<<PAGE_SHIFT) 221 #endif 222 223 /* bytes to clicks */ 224 #ifndef btoc 225 #define btoc(x) (((vm_offset_t)(x)+PAGE_MASK)>>PAGE_SHIFT) 226 #endif 227 228 /* 229 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We 230 * want to shift an unsigned type to avoid sign extension and we don't 231 * want to widen `bytes' unnecessarily. Assume that the result fits in 232 * a daddr_t. 233 */ 234 #ifndef btodb 235 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 236 (sizeof (bytes) > sizeof(long) \ 237 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \ 238 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT)) 239 #endif 240 241 #ifndef dbtob 242 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 243 ((off_t)(db) << DEV_BSHIFT) 244 #endif 245 246 #define PRIMASK 0x0ff 247 #define PCATCH 0x100 /* OR'd with pri for tsleep to check signals */ 248 #define PDROP 0x200 /* OR'd with pri to stop re-entry of interlock mutex */ 249 #define PNOLOCK 0x400 /* OR'd with pri to allow sleeping w/o a lock */ 250 #define PRILASTFLAG 0x400 /* Last flag defined above */ 251 252 #define NZERO 0 /* default "nice" */ 253 254 #define NBBY 8 /* number of bits in a byte */ 255 #define NBPW sizeof(int) /* number of bytes per word (integer) */ 256 257 #define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */ 258 259 #define NODEV (dev_t)(-1) /* non-existent device */ 260 261 /* 262 * File system parameters and macros. 263 * 264 * MAXBSIZE - Filesystems are made out of blocks of at most MAXBSIZE bytes 265 * per block. MAXBSIZE may be made larger without effecting 266 * any existing filesystems as long as it does not exceed MAXPHYS, 267 * and may be made smaller at the risk of not being able to use 268 * filesystems which require a block size exceeding MAXBSIZE. 269 * 270 * MAXBCACHEBUF - Maximum size of a buffer in the buffer cache. This must 271 * be >= MAXBSIZE and can be set differently for different 272 * architectures by defining it in <machine/param.h>. 273 * Making this larger allows NFS to do larger reads/writes. 274 * 275 * BKVASIZE - Nominal buffer space per buffer, in bytes. BKVASIZE is the 276 * minimum KVM memory reservation the kernel is willing to make. 277 * Filesystems can of course request smaller chunks. Actual 278 * backing memory uses a chunk size of a page (PAGE_SIZE). 279 * The default value here can be overridden on a per-architecture 280 * basis by defining it in <machine/param.h>. 281 * 282 * If you make BKVASIZE too small you risk seriously fragmenting 283 * the buffer KVM map which may slow things down a bit. If you 284 * make it too big the kernel will not be able to optimally use 285 * the KVM memory reserved for the buffer cache and will wind 286 * up with too-few buffers. 287 * 288 * The default is 16384, roughly 2x the block size used by a 289 * normal UFS filesystem. 290 */ 291 #define MAXBSIZE 65536 /* must be power of 2 */ 292 #ifndef MAXBCACHEBUF 293 #define MAXBCACHEBUF MAXBSIZE /* must be a power of 2 >= MAXBSIZE */ 294 #endif 295 #ifndef BKVASIZE 296 #define BKVASIZE 16384 /* must be power of 2 */ 297 #endif 298 #define BKVAMASK (BKVASIZE-1) 299 300 /* 301 * MAXPATHLEN defines the longest permissible path length after expanding 302 * symbolic links. It is used to allocate a temporary buffer from the buffer 303 * pool in which to do the name expansion, hence should be a power of two, 304 * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the 305 * maximum number of symbolic links that may be expanded in a path name. 306 * It should be set high enough to allow all legitimate uses, but halt 307 * infinite loops reasonably quickly. 308 */ 309 #define MAXPATHLEN PATH_MAX 310 #define MAXSYMLINKS 32 311 312 /* Bit map related macros. */ 313 #define setbit(a,i) (((unsigned char *)(a))[(i)/NBBY] |= 1<<((i)%NBBY)) 314 #define clrbit(a,i) (((unsigned char *)(a))[(i)/NBBY] &= ~(1<<((i)%NBBY))) 315 #define isset(a,i) \ 316 (((const unsigned char *)(a))[(i)/NBBY] & (1<<((i)%NBBY))) 317 #define isclr(a,i) \ 318 ((((const unsigned char *)(a))[(i)/NBBY] & (1<<((i)%NBBY))) == 0) 319 320 /* Macros for counting and rounding. */ 321 #ifndef howmany 322 #define howmany(x, y) (((x)+((y)-1))/(y)) 323 #endif 324 #define nitems(x) (sizeof((x)) / sizeof((x)[0])) 325 #define rounddown(x, y) (((x)/(y))*(y)) 326 #define rounddown2(x, y) __align_down(x, y) /* if y is power of two */ 327 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */ 328 #define roundup2(x, y) __align_up(x, y) /* if y is powers of two */ 329 #define powerof2(x) ((((x)-1)&(x))==0) 330 331 /* Macros for min/max. */ 332 #define MIN(a,b) (((a)<(b))?(a):(b)) 333 #define MAX(a,b) (((a)>(b))?(a):(b)) 334 335 #ifdef _KERNEL 336 /* 337 * Basic byte order function prototypes for non-inline functions. 338 */ 339 #ifndef LOCORE 340 #ifndef _BYTEORDER_PROTOTYPED 341 #define _BYTEORDER_PROTOTYPED 342 __BEGIN_DECLS 343 __uint32_t htonl(__uint32_t); 344 __uint16_t htons(__uint16_t); 345 __uint32_t ntohl(__uint32_t); 346 __uint16_t ntohs(__uint16_t); 347 __END_DECLS 348 #endif 349 #endif 350 351 #ifndef _BYTEORDER_FUNC_DEFINED 352 #define _BYTEORDER_FUNC_DEFINED 353 #define htonl(x) __htonl(x) 354 #define htons(x) __htons(x) 355 #define ntohl(x) __ntohl(x) 356 #define ntohs(x) __ntohs(x) 357 #endif /* !_BYTEORDER_FUNC_DEFINED */ 358 #endif /* _KERNEL */ 359 360 /* 361 * Scale factor for scaled integers used to count %cpu time and load avgs. 362 * 363 * The number of CPU `tick's that map to a unique `%age' can be expressed 364 * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that 365 * can be calculated (assuming 32 bits) can be closely approximated using 366 * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15). 367 * 368 * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age', 369 * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024. 370 */ 371 #define FSHIFT 11 /* bits to right of fixed binary point */ 372 #define FSCALE (1<<FSHIFT) 373 374 #define dbtoc(db) /* calculates devblks to pages */ \ 375 ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT)) 376 377 #define ctodb(db) /* calculates pages to devblks */ \ 378 ((db) << (PAGE_SHIFT - DEV_BSHIFT)) 379 380 /* 381 * Old spelling of __containerof(). 382 */ 383 #define member2struct(s, m, x) \ 384 ((struct s *)(void *)((char *)(x) - offsetof(struct s, m))) 385 386 /* 387 * Access a variable length array that has been declared as a fixed 388 * length array. 389 */ 390 #define __PAST_END(array, offset) (((__typeof__(*(array)) *)(array))[offset]) 391 392 #endif /* _SYS_PARAM_H_ */ 393