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 * 4. 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 * $FreeBSD$ 36 */ 37 38 #ifndef _SYS_PARAM_H_ 39 #define _SYS_PARAM_H_ 40 41 #include <sys/_null.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 * head/en_US.ISO8859-1/books/porters-handbook/book.xml 54 * 55 * scheme is: <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_*_0 is created, otherwise 'R' is 58 * in the range 5 to 9. 59 */ 60 #undef __FreeBSD_version 61 #define __FreeBSD_version 1000035 /* Master, propagated to newvers */ 62 63 /* 64 * __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD, 65 * which by definition is always true on FreeBSD. This macro is also defined 66 * on other systems that use the kernel of FreeBSD, such as GNU/kFreeBSD. 67 * 68 * It is tempting to use this macro in userland code when we want to enable 69 * kernel-specific routines, and in fact it's fine to do this in code that 70 * is part of FreeBSD itself. However, be aware that as presence of this 71 * macro is still not widespread (e.g. older FreeBSD versions, 3rd party 72 * compilers, etc), it is STRONGLY DISCOURAGED to check for this macro in 73 * external applications without also checking for __FreeBSD__ as an 74 * alternative. 75 */ 76 #undef __FreeBSD_kernel__ 77 #define __FreeBSD_kernel__ 78 79 #ifdef _KERNEL 80 #define P_OSREL_SIGWAIT 700000 81 #define P_OSREL_SIGSEGV 700004 82 #define P_OSREL_MAP_ANON 800104 83 #endif 84 85 #ifndef LOCORE 86 #include <sys/types.h> 87 #endif 88 89 /* 90 * Machine-independent constants (some used in following include files). 91 * Redefined constants are from POSIX 1003.1 limits file. 92 * 93 * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>) 94 */ 95 #include <sys/syslimits.h> 96 97 #define MAXCOMLEN 19 /* max command name remembered */ 98 #define MAXINTERP PATH_MAX /* max interpreter file name length */ 99 #define MAXLOGNAME 33 /* max login name length (incl. NUL) */ 100 #define MAXUPRC CHILD_MAX /* max simultaneous processes */ 101 #define NCARGS ARG_MAX /* max bytes for an exec function */ 102 #define NGROUPS (NGROUPS_MAX+1) /* max number groups */ 103 #define NOFILE OPEN_MAX /* max open files per process */ 104 #define NOGROUP 65535 /* marker for empty group set member */ 105 #define MAXHOSTNAMELEN 256 /* max hostname size */ 106 #define SPECNAMELEN 63 /* max length of devicename */ 107 108 /* More types and definitions used throughout the kernel. */ 109 #ifdef _KERNEL 110 #include <sys/cdefs.h> 111 #include <sys/errno.h> 112 #ifndef LOCORE 113 #include <sys/time.h> 114 #include <sys/priority.h> 115 #endif 116 117 #ifndef FALSE 118 #define FALSE 0 119 #endif 120 #ifndef TRUE 121 #define TRUE 1 122 #endif 123 #endif 124 125 #ifndef _KERNEL 126 /* Signals. */ 127 #include <sys/signal.h> 128 #endif 129 130 /* Machine type dependent parameters. */ 131 #include <machine/param.h> 132 #ifndef _KERNEL 133 #include <sys/limits.h> 134 #endif 135 136 #ifndef DEV_BSHIFT 137 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 138 #endif 139 #define DEV_BSIZE (1<<DEV_BSHIFT) 140 141 #ifndef BLKDEV_IOSIZE 142 #define BLKDEV_IOSIZE PAGE_SIZE /* default block device I/O size */ 143 #endif 144 #ifndef DFLTPHYS 145 #define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */ 146 #endif 147 #ifndef MAXPHYS 148 #define MAXPHYS (128 * 1024) /* max raw I/O transfer size */ 149 #endif 150 #ifndef MAXDUMPPGS 151 #define MAXDUMPPGS (DFLTPHYS/PAGE_SIZE) 152 #endif 153 154 /* 155 * Constants related to network buffer management. 156 * MCLBYTES must be no larger than PAGE_SIZE. 157 */ 158 #ifndef MSIZE 159 #define MSIZE 256 /* size of an mbuf */ 160 #endif 161 162 #ifndef MCLSHIFT 163 #define MCLSHIFT 11 /* convert bytes to mbuf clusters */ 164 #endif /* MCLSHIFT */ 165 166 #define MCLBYTES (1 << MCLSHIFT) /* size of an mbuf cluster */ 167 168 #if PAGE_SIZE < 2048 169 #define MJUMPAGESIZE MCLBYTES 170 #elif PAGE_SIZE <= 8192 171 #define MJUMPAGESIZE PAGE_SIZE 172 #else 173 #define MJUMPAGESIZE (8 * 1024) 174 #endif 175 176 #define MJUM9BYTES (9 * 1024) /* jumbo cluster 9k */ 177 #define MJUM16BYTES (16 * 1024) /* jumbo cluster 16k */ 178 179 /* 180 * Some macros for units conversion 181 */ 182 183 /* clicks to bytes */ 184 #ifndef ctob 185 #define ctob(x) ((x)<<PAGE_SHIFT) 186 #endif 187 188 /* bytes to clicks */ 189 #ifndef btoc 190 #define btoc(x) (((vm_offset_t)(x)+PAGE_MASK)>>PAGE_SHIFT) 191 #endif 192 193 /* 194 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We 195 * want to shift an unsigned type to avoid sign extension and we don't 196 * want to widen `bytes' unnecessarily. Assume that the result fits in 197 * a daddr_t. 198 */ 199 #ifndef btodb 200 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 201 (sizeof (bytes) > sizeof(long) \ 202 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \ 203 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT)) 204 #endif 205 206 #ifndef dbtob 207 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 208 ((off_t)(db) << DEV_BSHIFT) 209 #endif 210 211 #define PRIMASK 0x0ff 212 #define PCATCH 0x100 /* OR'd with pri for tsleep to check signals */ 213 #define PDROP 0x200 /* OR'd with pri to stop re-entry of interlock mutex */ 214 215 #define NZERO 0 /* default "nice" */ 216 217 #define NBBY 8 /* number of bits in a byte */ 218 #define NBPW sizeof(int) /* number of bytes per word (integer) */ 219 220 #define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */ 221 222 #define NODEV (dev_t)(-1) /* non-existent device */ 223 224 /* 225 * File system parameters and macros. 226 * 227 * MAXBSIZE - Filesystems are made out of blocks of at most MAXBSIZE bytes 228 * per block. MAXBSIZE may be made larger without effecting 229 * any existing filesystems as long as it does not exceed MAXPHYS, 230 * and may be made smaller at the risk of not being able to use 231 * filesystems which require a block size exceeding MAXBSIZE. 232 * 233 * BKVASIZE - Nominal buffer space per buffer, in bytes. BKVASIZE is the 234 * minimum KVM memory reservation the kernel is willing to make. 235 * Filesystems can of course request smaller chunks. Actual 236 * backing memory uses a chunk size of a page (PAGE_SIZE). 237 * 238 * If you make BKVASIZE too small you risk seriously fragmenting 239 * the buffer KVM map which may slow things down a bit. If you 240 * make it too big the kernel will not be able to optimally use 241 * the KVM memory reserved for the buffer cache and will wind 242 * up with too-few buffers. 243 * 244 * The default is 16384, roughly 2x the block size used by a 245 * normal UFS filesystem. 246 */ 247 #define MAXBSIZE 65536 /* must be power of 2 */ 248 #define BKVASIZE 16384 /* must be power of 2 */ 249 #define BKVAMASK (BKVASIZE-1) 250 251 /* 252 * MAXPATHLEN defines the longest permissible path length after expanding 253 * symbolic links. It is used to allocate a temporary buffer from the buffer 254 * pool in which to do the name expansion, hence should be a power of two, 255 * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the 256 * maximum number of symbolic links that may be expanded in a path name. 257 * It should be set high enough to allow all legitimate uses, but halt 258 * infinite loops reasonably quickly. 259 */ 260 #define MAXPATHLEN PATH_MAX 261 #define MAXSYMLINKS 32 262 263 /* Bit map related macros. */ 264 #define setbit(a,i) (((unsigned char *)(a))[(i)/NBBY] |= 1<<((i)%NBBY)) 265 #define clrbit(a,i) (((unsigned char *)(a))[(i)/NBBY] &= ~(1<<((i)%NBBY))) 266 #define isset(a,i) \ 267 (((const unsigned char *)(a))[(i)/NBBY] & (1<<((i)%NBBY))) 268 #define isclr(a,i) \ 269 ((((const unsigned char *)(a))[(i)/NBBY] & (1<<((i)%NBBY))) == 0) 270 271 /* Macros for counting and rounding. */ 272 #ifndef howmany 273 #define howmany(x, y) (((x)+((y)-1))/(y)) 274 #endif 275 #define nitems(x) (sizeof((x)) / sizeof((x)[0])) 276 #define rounddown(x, y) (((x)/(y))*(y)) 277 #define rounddown2(x, y) ((x)&(~((y)-1))) /* if y is power of two */ 278 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */ 279 #define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */ 280 #define powerof2(x) ((((x)-1)&(x))==0) 281 282 /* Macros for min/max. */ 283 #define MIN(a,b) (((a)<(b))?(a):(b)) 284 #define MAX(a,b) (((a)>(b))?(a):(b)) 285 286 #ifdef _KERNEL 287 /* 288 * Basic byte order function prototypes for non-inline functions. 289 */ 290 #ifndef LOCORE 291 #ifndef _BYTEORDER_PROTOTYPED 292 #define _BYTEORDER_PROTOTYPED 293 __BEGIN_DECLS 294 __uint32_t htonl(__uint32_t); 295 __uint16_t htons(__uint16_t); 296 __uint32_t ntohl(__uint32_t); 297 __uint16_t ntohs(__uint16_t); 298 __END_DECLS 299 #endif 300 #endif 301 302 #ifndef lint 303 #ifndef _BYTEORDER_FUNC_DEFINED 304 #define _BYTEORDER_FUNC_DEFINED 305 #define htonl(x) __htonl(x) 306 #define htons(x) __htons(x) 307 #define ntohl(x) __ntohl(x) 308 #define ntohs(x) __ntohs(x) 309 #endif /* !_BYTEORDER_FUNC_DEFINED */ 310 #endif /* lint */ 311 #endif /* _KERNEL */ 312 313 /* 314 * Scale factor for scaled integers used to count %cpu time and load avgs. 315 * 316 * The number of CPU `tick's that map to a unique `%age' can be expressed 317 * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that 318 * can be calculated (assuming 32 bits) can be closely approximated using 319 * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15). 320 * 321 * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age', 322 * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024. 323 */ 324 #define FSHIFT 11 /* bits to right of fixed binary point */ 325 #define FSCALE (1<<FSHIFT) 326 327 #define dbtoc(db) /* calculates devblks to pages */ \ 328 ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT)) 329 330 #define ctodb(db) /* calculates pages to devblks */ \ 331 ((db) << (PAGE_SHIFT - DEV_BSHIFT)) 332 333 /* 334 * Old spelling of __containerof(). 335 */ 336 #define member2struct(s, m, x) \ 337 ((struct s *)(void *)((char *)(x) - offsetof(struct s, m))) 338 339 /* 340 * Access a variable length array that has been declared as a fixed 341 * length array. 342 */ 343 #define __PAST_END(array, offset) (((__typeof__(*(array)) *)(array))[offset]) 344 345 #endif /* _SYS_PARAM_H_ */ 346