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 37 #ifndef _SYS_PARAM_H_ 38 #define _SYS_PARAM_H_ 39 40 #include <sys/_null.h> 41 #include <sys/_param.h> 42 43 #define BSD 199506 /* System version (year & month). */ 44 #define BSD4_3 1 45 #define BSD4_4 1 46 47 /* 48 * __FreeBSD_version numbers are documented in the Porter's Handbook. 49 * If you bump the version for any reason, you should update the documentation 50 * there. 51 * Currently this lives here in the doc/ repository: 52 * 53 * documentation/content/en/books/porters-handbook/versions/_index.adoc 54 * 55 * Encoding: <major><two digit minor>Rxx 56 * 'R' is in the range 0 to 4 if this is a release branch or 57 * X.0-CURRENT before releng/X.0 is created, otherwise 'R' is 58 * in the range 5 to 9. 59 * Short hand: MMmmXXX 60 * 61 * __FreeBSD_version is bumped every time there's a change in the base system 62 * that's noteworthy. A noteworthy change is any change which changes the 63 * kernel's KBI in -CURRENT, one that changes some detail about the system that 64 * external software (or the ports system) would want to know about, one that 65 * adds a system call, one that adds or deletes a shipped library, a security 66 * fix, or similar change not specifically noted here. Bumps should be limited 67 * to one per day / a couple per week except for security fixes. 68 * 69 * The approved way to obtain this from a shell script is: 70 * awk '/^\#define[[:space:]]*__FreeBSD_version/ {print $3}' 71 * Other methods to parse this file may work, but are not guaranteed against 72 * future changes. The above script works back to FreeBSD 3.x when this macro 73 * was introduced. This number is propagated to other places needing it that 74 * cannot include sys/param.h and should only be updated here. 75 */ 76 #undef __FreeBSD_version 77 #define __FreeBSD_version 1600011 78 79 /* 80 * __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD, 81 * which by definition is always true on FreeBSD. This macro is also defined 82 * on other systems that use the kernel of FreeBSD, such as GNU/kFreeBSD. 83 * 84 * It is tempting to use this macro in userland code when we want to enable 85 * kernel-specific routines, and in fact it's fine to do this in code that 86 * is part of FreeBSD itself. However, be aware that as presence of this 87 * macro is still not widespread (e.g. older FreeBSD versions, 3rd party 88 * compilers, etc), it is STRONGLY DISCOURAGED to check for this macro in 89 * external applications without also checking for __FreeBSD__ as an 90 * alternative. 91 */ 92 #undef __FreeBSD_kernel__ 93 #define __FreeBSD_kernel__ 94 95 #if defined(_KERNEL) || defined(_WANT_P_OSREL) 96 #define P_OSREL_SIGWAIT 700000 97 #define P_OSREL_SIGSEGV 700004 98 #define P_OSREL_MAP_ANON 800104 99 #define P_OSREL_MAP_FSTRICT 1100036 100 #define P_OSREL_SHUTDOWN_ENOTCONN 1100077 101 #define P_OSREL_MAP_GUARD 1200035 102 #define P_OSREL_WRFSBASE 1200041 103 #define P_OSREL_CK_CYLGRP 1200046 104 #define P_OSREL_VMTOTAL64 1200054 105 #define P_OSREL_CK_SUPERBLOCK 1300000 106 #define P_OSREL_CK_INODE 1300005 107 #define P_OSREL_POWERPC_NEW_AUX_ARGS 1300070 108 #define P_OSREL_TIDPID 1400079 109 #define P_OSREL_ARM64_SPSR 1400084 110 #define P_OSREL_TLSBASE 1500044 111 #define P_OSREL_EXTERRCTL 1500045 112 113 #define P_OSREL_MAJOR(x) ((x) / 100000) 114 #endif 115 116 #ifndef LOCORE 117 #include <sys/types.h> 118 #endif 119 120 /* 121 * Machine-independent constants (some used in following include files). 122 * Redefined constants are from POSIX 1003.1 limits file. 123 * 124 * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>) 125 */ 126 #include <sys/syslimits.h> 127 128 #define MAXCOMLEN 19 /* max command name remembered */ 129 #define MAXINTERP PATH_MAX /* max interpreter file name length */ 130 #define MAXLOGNAME 33 /* max login name length (incl. NUL) */ 131 #define MAXUPRC CHILD_MAX /* max simultaneous processes */ 132 #define NCARGS ARG_MAX /* max bytes for an exec function */ 133 #define NGROUPS (NGROUPS_MAX+1) /* max number groups */ 134 #define NOFILE OPEN_MAX /* max open files per process */ 135 #define NOGROUP 65535 /* marker for empty group set member */ 136 #define MAXHOSTNAMELEN 256 /* max hostname size */ 137 #define SPECNAMELEN 255 /* max length of devicename */ 138 139 /* More types and definitions used throughout the kernel. */ 140 #ifdef _KERNEL 141 #include <sys/cdefs.h> 142 #include <sys/errno.h> 143 #ifndef LOCORE 144 #include <sys/time.h> 145 #include <sys/priority.h> 146 #endif 147 148 #ifndef FALSE 149 #define FALSE 0 150 #endif 151 #ifndef TRUE 152 #define TRUE 1 153 #endif 154 #endif 155 156 #if !defined(_KERNEL) && !defined(_STANDALONE) && !defined(LOCORE) 157 /* Signals. */ 158 #include <sys/signal.h> 159 #endif 160 161 /* Machine type dependent parameters. */ 162 #include <machine/param.h> 163 #ifndef _KERNEL 164 #include <sys/limits.h> 165 #include <sys/_maxphys.h> 166 #endif 167 168 #ifndef DEV_BSHIFT 169 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 170 #endif 171 #define DEV_BSIZE (1<<DEV_BSHIFT) 172 173 #ifndef BLKDEV_IOSIZE 174 #define BLKDEV_IOSIZE PAGE_SIZE /* default block device I/O size */ 175 #endif 176 #ifndef DFLTPHYS 177 #define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */ 178 #endif 179 #ifndef MAXDUMPPGS 180 #define MAXDUMPPGS (DFLTPHYS/PAGE_SIZE) 181 #endif 182 #ifdef STACKALIGNBYTES 183 #define STACKALIGN(p) (__align_down(p, STACKALIGNBYTES + 1)) 184 #endif 185 186 /* 187 * Constants related to network buffer management. 188 * MCLBYTES must be no larger than PAGE_SIZE. 189 */ 190 #ifndef MSIZE 191 #define MSIZE 256 /* size of an mbuf */ 192 #endif 193 194 #ifndef MCLSHIFT 195 #define MCLSHIFT 11 /* convert bytes to mbuf clusters */ 196 #endif /* MCLSHIFT */ 197 198 #define MCLBYTES (1 << MCLSHIFT) /* size of an mbuf cluster */ 199 200 #if PAGE_SIZE <= 8192 201 #define MJUMPAGESIZE PAGE_SIZE 202 #else 203 #define MJUMPAGESIZE (8 * 1024) 204 #endif 205 206 #define MJUM9BYTES (9 * 1024) /* jumbo cluster 9k */ 207 #define MJUM16BYTES (16 * 1024) /* jumbo cluster 16k */ 208 209 /* 210 * Mach derived conversion macros 211 */ 212 #define round_page(x) roundup2(x, PAGE_SIZE) 213 #define trunc_page(x) rounddown2(x, PAGE_SIZE) 214 215 #define atop(x) ((x) >> PAGE_SHIFT) 216 #define ptoa(x) ((x) << PAGE_SHIFT) 217 218 #define pgtok(x) ((x) * (PAGE_SIZE / 1024)) 219 220 /* 221 * Some macros for units conversion 222 */ 223 224 /* clicks to bytes */ 225 #ifndef ctob 226 #define ctob(x) ((x)<<PAGE_SHIFT) 227 #endif 228 229 /* bytes to clicks */ 230 #ifndef btoc 231 #define btoc(x) (((vm_offset_t)(x)+PAGE_MASK)>>PAGE_SHIFT) 232 #endif 233 234 /* 235 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We 236 * want to shift an unsigned type to avoid sign extension and we don't 237 * want to widen `bytes' unnecessarily. Assume that the result fits in 238 * a daddr_t. 239 */ 240 #ifndef btodb 241 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 242 (sizeof (bytes) > sizeof(long) \ 243 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \ 244 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT)) 245 #endif 246 247 #ifndef dbtob 248 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 249 ((off_t)(db) << DEV_BSHIFT) 250 #endif 251 252 #define PRIMASK 0x0ff 253 #define PCATCH 0x100 /* OR'd with pri for tsleep to check signals */ 254 #define PDROP 0x200 /* OR'd with pri to stop re-entry of interlock mutex */ 255 #define PNOLOCK 0x400 /* OR'd with pri to allow sleeping w/o a lock */ 256 #define PRILASTFLAG 0x400 /* Last flag defined above */ 257 258 #define NZERO 0 /* default "nice" */ 259 260 #define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */ 261 262 #define NODEV (dev_t)(-1) /* non-existent device */ 263 264 /* 265 * File system parameters and macros. 266 * 267 * MAXBSIZE - Filesystems are made out of blocks of at most MAXBSIZE bytes 268 * per block. MAXBSIZE may be made larger without effecting 269 * any existing filesystems as long as it does not exceed MAXPHYS, 270 * and may be made smaller at the risk of not being able to use 271 * filesystems which require a block size exceeding MAXBSIZE. 272 * 273 * MAXBCACHEBUF - Maximum size of a buffer in the buffer cache. This must 274 * be >= MAXBSIZE and can be set differently for different 275 * architectures by defining it in <machine/param.h>. 276 * Making this larger allows NFS to do larger reads/writes. 277 * 278 * BKVASIZE - Nominal buffer space per buffer, in bytes. BKVASIZE is the 279 * minimum KVM memory reservation the kernel is willing to make. 280 * Filesystems can of course request smaller chunks. Actual 281 * backing memory uses a chunk size of a page (PAGE_SIZE). 282 * The default value here can be overridden on a per-architecture 283 * basis by defining it in <machine/param.h>. 284 * 285 * If you make BKVASIZE too small you risk seriously fragmenting 286 * the buffer KVM map which may slow things down a bit. If you 287 * make it too big the kernel will not be able to optimally use 288 * the KVM memory reserved for the buffer cache and will wind 289 * up with too-few buffers. 290 * 291 * The default is 16384, roughly 2x the block size used by a 292 * normal UFS filesystem. 293 */ 294 #define MAXBSIZE 65536 /* must be power of 2 */ 295 #ifndef MAXBCACHEBUF 296 #define MAXBCACHEBUF MAXBSIZE /* must be a power of 2 >= MAXBSIZE */ 297 #endif 298 #ifndef BKVASIZE 299 #define BKVASIZE 16384 /* must be power of 2 */ 300 #endif 301 #define BKVAMASK (BKVASIZE-1) 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) (((unsigned char *)(a))[(i)/NBBY] |= 1<<((i)%NBBY)) 317 #define clrbit(a,i) (((unsigned char *)(a))[(i)/NBBY] &= ~(1<<((i)%NBBY))) 318 #define isset(a,i) \ 319 (((const unsigned char *)(a))[(i)/NBBY] & (1<<((i)%NBBY))) 320 #define isclr(a,i) \ 321 ((((const unsigned char *)(a))[(i)/NBBY] & (1<<((i)%NBBY))) == 0) 322 323 /* Macros for counting and rounding provided by <sys/_param.h>. */ 324 325 /* Macros for min/max. */ 326 #define MIN(a,b) (((a)<(b))?(a):(b)) 327 #define MAX(a,b) (((a)>(b))?(a):(b)) 328 329 #ifdef _KERNEL 330 /* 331 * Basic byte order function prototypes for non-inline functions. 332 */ 333 #ifndef LOCORE 334 #ifndef _BYTEORDER_PROTOTYPED 335 #define _BYTEORDER_PROTOTYPED 336 __BEGIN_DECLS 337 __uint32_t htonl(__uint32_t); 338 __uint16_t htons(__uint16_t); 339 __uint32_t ntohl(__uint32_t); 340 __uint16_t ntohs(__uint16_t); 341 __END_DECLS 342 #endif 343 #endif 344 345 #ifndef _BYTEORDER_FUNC_DEFINED 346 #define _BYTEORDER_FUNC_DEFINED 347 #define htonl(x) __htonl(x) 348 #define htons(x) __htons(x) 349 #define ntohl(x) __ntohl(x) 350 #define ntohs(x) __ntohs(x) 351 #endif /* !_BYTEORDER_FUNC_DEFINED */ 352 #endif /* _KERNEL */ 353 354 /* 355 * Scale factor for scaled integers used to count %cpu time and load avgs. 356 * 357 * The number of CPU `tick's that map to a unique `%age' can be expressed 358 * by the formula (1 / (2 ^ (FSHIFT - 11))). Since the intermediate 359 * calculation is done with 64-bit precision, the maximum load average that can 360 * be calculated is approximately 2^32 / FSCALE. 361 * 362 * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age', 363 * FSHIFT must be at least 11. This gives a maximum load avg of 2 million. 364 */ 365 #define FSHIFT 11 /* bits to right of fixed binary point */ 366 #define FSCALE (1<<FSHIFT) 367 368 #define dbtoc(db) /* calculates devblks to pages */ \ 369 ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT)) 370 371 #define ctodb(db) /* calculates pages to devblks */ \ 372 ((db) << (PAGE_SHIFT - DEV_BSHIFT)) 373 374 /* 375 * Old spelling of __containerof(). 376 */ 377 #define member2struct(s, m, x) \ 378 ((struct s *)(void *)((char *)(x) - offsetof(struct s, m))) 379 380 /* 381 * Access a variable length array that has been declared as a fixed 382 * length array. 383 */ 384 #define __PAST_END(array, offset) (((__typeof__(*(array)) *)(array))[offset]) 385 386 #endif /* _SYS_PARAM_H_ */ 387