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: 52 * 53 * doc/en_US.ISO8859-1/books/porters-handbook/book.sgml 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 900034 /* Master, propagated to newvers */ 62 63 #ifdef _KERNEL 64 #define P_OSREL_SIGSEGV 700004 65 #define P_OSREL_MAP_ANON 800104 66 #endif 67 68 #ifndef LOCORE 69 #include <sys/types.h> 70 #endif 71 72 /* 73 * Machine-independent constants (some used in following include files). 74 * Redefined constants are from POSIX 1003.1 limits file. 75 * 76 * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>) 77 */ 78 #include <sys/syslimits.h> 79 80 #define MAXCOMLEN 19 /* max command name remembered */ 81 #define MAXINTERP PATH_MAX /* max interpreter file name length */ 82 #define MAXLOGNAME 17 /* max login name length (incl. NUL) */ 83 #define MAXUPRC CHILD_MAX /* max simultaneous processes */ 84 #define NCARGS ARG_MAX /* max bytes for an exec function */ 85 #define NGROUPS (NGROUPS_MAX+1) /* max number groups */ 86 #define NOFILE OPEN_MAX /* max open files per process */ 87 #define NOGROUP 65535 /* marker for empty group set member */ 88 #define MAXHOSTNAMELEN 256 /* max hostname size */ 89 #define SPECNAMELEN 63 /* max length of devicename */ 90 91 /* More types and definitions used throughout the kernel. */ 92 #ifdef _KERNEL 93 #include <sys/cdefs.h> 94 #include <sys/errno.h> 95 #ifndef LOCORE 96 #include <sys/time.h> 97 #include <sys/priority.h> 98 #endif 99 100 #ifndef FALSE 101 #define FALSE 0 102 #endif 103 #ifndef TRUE 104 #define TRUE 1 105 #endif 106 #endif 107 108 #ifndef _KERNEL 109 /* Signals. */ 110 #include <sys/signal.h> 111 #endif 112 113 /* Machine type dependent parameters. */ 114 #include <machine/param.h> 115 #ifndef _KERNEL 116 #include <sys/limits.h> 117 #endif 118 119 #ifndef DEV_BSHIFT 120 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 121 #endif 122 #define DEV_BSIZE (1<<DEV_BSHIFT) 123 124 #ifndef BLKDEV_IOSIZE 125 #define BLKDEV_IOSIZE PAGE_SIZE /* default block device I/O size */ 126 #endif 127 #ifndef DFLTPHYS 128 #define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */ 129 #endif 130 #ifndef MAXPHYS 131 #define MAXPHYS (128 * 1024) /* max raw I/O transfer size */ 132 #endif 133 #ifndef MAXDUMPPGS 134 #define MAXDUMPPGS (DFLTPHYS/PAGE_SIZE) 135 #endif 136 137 /* 138 * Constants related to network buffer management. 139 * MCLBYTES must be no larger than PAGE_SIZE. 140 */ 141 #ifndef MSIZE 142 #define MSIZE 256 /* size of an mbuf */ 143 #endif /* MSIZE */ 144 145 #ifndef MCLSHIFT 146 #define MCLSHIFT 11 /* convert bytes to mbuf clusters */ 147 #endif /* MCLSHIFT */ 148 149 #define MCLBYTES (1 << MCLSHIFT) /* size of an mbuf cluster */ 150 151 #if PAGE_SIZE < 2048 152 #define MJUMPAGESIZE MCLBYTES 153 #elif PAGE_SIZE <= 8192 154 #define MJUMPAGESIZE PAGE_SIZE 155 #else 156 #define MJUMPAGESIZE (8 * 1024) 157 #endif 158 159 #define MJUM9BYTES (9 * 1024) /* jumbo cluster 9k */ 160 #define MJUM16BYTES (16 * 1024) /* jumbo cluster 16k */ 161 162 /* 163 * Some macros for units conversion 164 */ 165 166 /* clicks to bytes */ 167 #ifndef ctob 168 #define ctob(x) ((x)<<PAGE_SHIFT) 169 #endif 170 171 /* bytes to clicks */ 172 #ifndef btoc 173 #define btoc(x) (((vm_offset_t)(x)+PAGE_MASK)>>PAGE_SHIFT) 174 #endif 175 176 /* 177 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We 178 * want to shift an unsigned type to avoid sign extension and we don't 179 * want to widen `bytes' unnecessarily. Assume that the result fits in 180 * a daddr_t. 181 */ 182 #ifndef btodb 183 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 184 (sizeof (bytes) > sizeof(long) \ 185 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \ 186 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT)) 187 #endif 188 189 #ifndef dbtob 190 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 191 ((off_t)(db) << DEV_BSHIFT) 192 #endif 193 194 #define PRIMASK 0x0ff 195 #define PCATCH 0x100 /* OR'd with pri for tsleep to check signals */ 196 #define PDROP 0x200 /* OR'd with pri to stop re-entry of interlock mutex */ 197 #define PBDRY 0x400 /* for PCATCH stop is done on the user boundary */ 198 199 #define NZERO 0 /* default "nice" */ 200 201 #define NBBY 8 /* number of bits in a byte */ 202 #define NBPW sizeof(int) /* number of bytes per word (integer) */ 203 204 #define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */ 205 206 #define NODEV (dev_t)(-1) /* non-existent device */ 207 208 /* 209 * File system parameters and macros. 210 * 211 * MAXBSIZE - Filesystems are made out of blocks of at most MAXBSIZE bytes 212 * per block. MAXBSIZE may be made larger without effecting 213 * any existing filesystems as long as it does not exceed MAXPHYS, 214 * and may be made smaller at the risk of not being able to use 215 * filesystems which require a block size exceeding MAXBSIZE. 216 * 217 * BKVASIZE - Nominal buffer space per buffer, in bytes. BKVASIZE is the 218 * minimum KVM memory reservation the kernel is willing to make. 219 * Filesystems can of course request smaller chunks. Actual 220 * backing memory uses a chunk size of a page (PAGE_SIZE). 221 * 222 * If you make BKVASIZE too small you risk seriously fragmenting 223 * the buffer KVM map which may slow things down a bit. If you 224 * make it too big the kernel will not be able to optimally use 225 * the KVM memory reserved for the buffer cache and will wind 226 * up with too-few buffers. 227 * 228 * The default is 16384, roughly 2x the block size used by a 229 * normal UFS filesystem. 230 */ 231 #define MAXBSIZE 65536 /* must be power of 2 */ 232 #define BKVASIZE 16384 /* must be power of 2 */ 233 #define BKVAMASK (BKVASIZE-1) 234 235 /* 236 * MAXPATHLEN defines the longest permissible path length after expanding 237 * symbolic links. It is used to allocate a temporary buffer from the buffer 238 * pool in which to do the name expansion, hence should be a power of two, 239 * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the 240 * maximum number of symbolic links that may be expanded in a path name. 241 * It should be set high enough to allow all legitimate uses, but halt 242 * infinite loops reasonably quickly. 243 */ 244 #define MAXPATHLEN PATH_MAX 245 #define MAXSYMLINKS 32 246 247 /* Bit map related macros. */ 248 #define setbit(a,i) (((unsigned char *)(a))[(i)/NBBY] |= 1<<((i)%NBBY)) 249 #define clrbit(a,i) (((unsigned char *)(a))[(i)/NBBY] &= ~(1<<((i)%NBBY))) 250 #define isset(a,i) \ 251 (((const unsigned char *)(a))[(i)/NBBY] & (1<<((i)%NBBY))) 252 #define isclr(a,i) \ 253 ((((const unsigned char *)(a))[(i)/NBBY] & (1<<((i)%NBBY))) == 0) 254 255 /* Macros for counting and rounding. */ 256 #ifndef howmany 257 #define howmany(x, y) (((x)+((y)-1))/(y)) 258 #endif 259 #define rounddown(x, y) (((x)/(y))*(y)) 260 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */ 261 #define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */ 262 #define powerof2(x) ((((x)-1)&(x))==0) 263 264 /* Macros for min/max. */ 265 #define MIN(a,b) (((a)<(b))?(a):(b)) 266 #define MAX(a,b) (((a)>(b))?(a):(b)) 267 268 #ifdef _KERNEL 269 /* 270 * Basic byte order function prototypes for non-inline functions. 271 */ 272 #ifndef LOCORE 273 #ifndef _BYTEORDER_PROTOTYPED 274 #define _BYTEORDER_PROTOTYPED 275 __BEGIN_DECLS 276 __uint32_t htonl(__uint32_t); 277 __uint16_t htons(__uint16_t); 278 __uint32_t ntohl(__uint32_t); 279 __uint16_t ntohs(__uint16_t); 280 __END_DECLS 281 #endif 282 #endif 283 284 #ifndef lint 285 #ifndef _BYTEORDER_FUNC_DEFINED 286 #define _BYTEORDER_FUNC_DEFINED 287 #define htonl(x) __htonl(x) 288 #define htons(x) __htons(x) 289 #define ntohl(x) __ntohl(x) 290 #define ntohs(x) __ntohs(x) 291 #endif /* !_BYTEORDER_FUNC_DEFINED */ 292 #endif /* lint */ 293 #endif /* _KERNEL */ 294 295 /* 296 * Scale factor for scaled integers used to count %cpu time and load avgs. 297 * 298 * The number of CPU `tick's that map to a unique `%age' can be expressed 299 * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that 300 * can be calculated (assuming 32 bits) can be closely approximated using 301 * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15). 302 * 303 * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age', 304 * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024. 305 */ 306 #define FSHIFT 11 /* bits to right of fixed binary point */ 307 #define FSCALE (1<<FSHIFT) 308 309 #define dbtoc(db) /* calculates devblks to pages */ \ 310 ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT)) 311 312 #define ctodb(db) /* calculates pages to devblks */ \ 313 ((db) << (PAGE_SHIFT - DEV_BSHIFT)) 314 315 /* 316 * Given the pointer x to the member m of the struct s, return 317 * a pointer to the containing structure. 318 */ 319 #define member2struct(s, m, x) \ 320 ((struct s *)(void *)((char *)(x) - offsetof(struct s, m))) 321 322 #endif /* _SYS_PARAM_H_ */ 323