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 0 if release branch or x.0-CURRENT before RELENG_*_0 57 * is created, otherwise 1. 58 */ 59 #undef __FreeBSD_version 60 #define __FreeBSD_version 800036 /* Master, propagated to newvers */ 61 62 #ifndef LOCORE 63 #include <sys/types.h> 64 #endif 65 66 /* 67 * Machine-independent constants (some used in following include files). 68 * Redefined constants are from POSIX 1003.1 limits file. 69 * 70 * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>) 71 * MAXLOGNAME should be == UT_NAMESIZE+1 (see <utmp.h>) 72 */ 73 #include <sys/syslimits.h> 74 75 #define MAXCOMLEN 19 /* max command name remembered */ 76 #define MAXINTERP 32 /* max interpreter file name length */ 77 #define MAXLOGNAME 17 /* max login name length (incl. NUL) */ 78 #define MAXUPRC CHILD_MAX /* max simultaneous processes */ 79 #define NCARGS ARG_MAX /* max bytes for an exec function */ 80 #define NGROUPS NGROUPS_MAX /* max number groups */ 81 #define NOFILE OPEN_MAX /* max open files per process */ 82 #define NOGROUP 65535 /* marker for empty group set member */ 83 #define MAXHOSTNAMELEN 256 /* max hostname size */ 84 #define SPECNAMELEN 63 /* max length of devicename */ 85 86 /* More types and definitions used throughout the kernel. */ 87 #ifdef _KERNEL 88 #include <sys/cdefs.h> 89 #include <sys/errno.h> 90 #ifndef LOCORE 91 #include <sys/time.h> 92 #include <sys/priority.h> 93 #endif 94 95 #define FALSE 0 96 #define TRUE 1 97 #endif 98 99 #ifndef _KERNEL 100 /* Signals. */ 101 #include <sys/signal.h> 102 #endif 103 104 /* Machine type dependent parameters. */ 105 #include <machine/param.h> 106 #ifndef _KERNEL 107 #include <sys/limits.h> 108 #endif 109 110 #ifndef _NO_NAMESPACE_POLLUTION 111 112 #ifndef DEV_BSHIFT 113 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 114 #endif 115 #define DEV_BSIZE (1<<DEV_BSHIFT) 116 117 #ifndef BLKDEV_IOSIZE 118 #define BLKDEV_IOSIZE PAGE_SIZE /* default block device I/O size */ 119 #endif 120 #ifndef DFLTPHYS 121 #define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */ 122 #endif 123 #ifndef MAXPHYS 124 #define MAXPHYS (128 * 1024) /* max raw I/O transfer size */ 125 #endif 126 #ifndef MAXDUMPPGS 127 #define MAXDUMPPGS (DFLTPHYS/PAGE_SIZE) 128 #endif 129 130 /* 131 * Constants related to network buffer management. 132 * MCLBYTES must be no larger than PAGE_SIZE. 133 */ 134 #ifndef MSIZE 135 #define MSIZE 256 /* size of an mbuf */ 136 #endif /* MSIZE */ 137 138 #ifndef MCLSHIFT 139 #define MCLSHIFT 11 /* convert bytes to mbuf clusters */ 140 #endif /* MCLSHIFT */ 141 142 #define MCLBYTES (1 << MCLSHIFT) /* size of an mbuf cluster */ 143 144 #define MJUMPAGESIZE PAGE_SIZE /* jumbo cluster 4k */ 145 #define MJUM9BYTES (9 * 1024) /* jumbo cluster 9k */ 146 #define MJUM16BYTES (16 * 1024) /* jumbo cluster 16k */ 147 148 /* 149 * Some macros for units conversion 150 */ 151 152 /* clicks to bytes */ 153 #ifndef ctob 154 #define ctob(x) ((x)<<PAGE_SHIFT) 155 #endif 156 157 /* bytes to clicks */ 158 #ifndef btoc 159 #define btoc(x) (((vm_offset_t)(x)+PAGE_MASK)>>PAGE_SHIFT) 160 #endif 161 162 /* 163 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We 164 * want to shift an unsigned type to avoid sign extension and we don't 165 * want to widen `bytes' unnecessarily. Assume that the result fits in 166 * a daddr_t. 167 */ 168 #ifndef btodb 169 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 170 (sizeof (bytes) > sizeof(long) \ 171 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \ 172 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT)) 173 #endif 174 175 #ifndef dbtob 176 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 177 ((off_t)(db) << DEV_BSHIFT) 178 #endif 179 180 #endif /* _NO_NAMESPACE_POLLUTION */ 181 182 #define PRIMASK 0x0ff 183 #define PCATCH 0x100 /* OR'd with pri for tsleep to check signals */ 184 #define PDROP 0x200 /* OR'd with pri to stop re-entry of interlock mutex */ 185 186 #define NZERO 0 /* default "nice" */ 187 188 #define NBBY 8 /* number of bits in a byte */ 189 #define NBPW sizeof(int) /* number of bytes per word (integer) */ 190 191 #define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */ 192 193 #define NODEV (dev_t)(-1) /* non-existent device */ 194 195 #define CBLOCK 128 /* Clist block size, must be a power of 2. */ 196 #define CBQSIZE (CBLOCK/NBBY) /* Quote bytes/cblock - can do better. */ 197 /* Data chars/clist. */ 198 #define CBSIZE (CBLOCK - sizeof(struct cblock *) - CBQSIZE) 199 #define CROUND (CBLOCK - 1) /* Clist rounding. */ 200 201 /* 202 * File system parameters and macros. 203 * 204 * MAXBSIZE - Filesystems are made out of blocks of at most MAXBSIZE bytes 205 * per block. MAXBSIZE may be made larger without effecting 206 * any existing filesystems as long as it does not exceed MAXPHYS, 207 * and may be made smaller at the risk of not being able to use 208 * filesystems which require a block size exceeding MAXBSIZE. 209 * 210 * BKVASIZE - Nominal buffer space per buffer, in bytes. BKVASIZE is the 211 * minimum KVM memory reservation the kernel is willing to make. 212 * Filesystems can of course request smaller chunks. Actual 213 * backing memory uses a chunk size of a page (PAGE_SIZE). 214 * 215 * If you make BKVASIZE too small you risk seriously fragmenting 216 * the buffer KVM map which may slow things down a bit. If you 217 * make it too big the kernel will not be able to optimally use 218 * the KVM memory reserved for the buffer cache and will wind 219 * up with too-few buffers. 220 * 221 * The default is 16384, roughly 2x the block size used by a 222 * normal UFS filesystem. 223 */ 224 #define MAXBSIZE 65536 /* must be power of 2 */ 225 #define BKVASIZE 16384 /* must be power of 2 */ 226 #define BKVAMASK (BKVASIZE-1) 227 228 /* 229 * MAXPATHLEN defines the longest permissible path length after expanding 230 * symbolic links. It is used to allocate a temporary buffer from the buffer 231 * pool in which to do the name expansion, hence should be a power of two, 232 * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the 233 * maximum number of symbolic links that may be expanded in a path name. 234 * It should be set high enough to allow all legitimate uses, but halt 235 * infinite loops reasonably quickly. 236 */ 237 #define MAXPATHLEN PATH_MAX 238 #define MAXSYMLINKS 32 239 240 /* Bit map related macros. */ 241 #define setbit(a,i) (((unsigned char *)(a))[(i)/NBBY] |= 1<<((i)%NBBY)) 242 #define clrbit(a,i) (((unsigned char *)(a))[(i)/NBBY] &= ~(1<<((i)%NBBY))) 243 #define isset(a,i) \ 244 (((const unsigned char *)(a))[(i)/NBBY] & (1<<((i)%NBBY))) 245 #define isclr(a,i) \ 246 ((((const unsigned char *)(a))[(i)/NBBY] & (1<<((i)%NBBY))) == 0) 247 248 /* Macros for counting and rounding. */ 249 #ifndef howmany 250 #define howmany(x, y) (((x)+((y)-1))/(y)) 251 #endif 252 #define rounddown(x, y) (((x)/(y))*(y)) 253 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */ 254 #define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */ 255 #define powerof2(x) ((((x)-1)&(x))==0) 256 257 /* Macros for min/max. */ 258 #define MIN(a,b) (((a)<(b))?(a):(b)) 259 #define MAX(a,b) (((a)>(b))?(a):(b)) 260 261 #ifdef _KERNEL 262 /* 263 * Basic byte order function prototypes for non-inline functions. 264 */ 265 #ifndef LOCORE 266 #ifndef _BYTEORDER_PROTOTYPED 267 #define _BYTEORDER_PROTOTYPED 268 __BEGIN_DECLS 269 __uint32_t htonl(__uint32_t); 270 __uint16_t htons(__uint16_t); 271 __uint32_t ntohl(__uint32_t); 272 __uint16_t ntohs(__uint16_t); 273 __END_DECLS 274 #endif 275 #endif 276 277 #ifndef lint 278 #ifndef _BYTEORDER_FUNC_DEFINED 279 #define _BYTEORDER_FUNC_DEFINED 280 #define htonl(x) __htonl(x) 281 #define htons(x) __htons(x) 282 #define ntohl(x) __ntohl(x) 283 #define ntohs(x) __ntohs(x) 284 #endif /* !_BYTEORDER_FUNC_DEFINED */ 285 #endif /* lint */ 286 #endif /* _KERNEL */ 287 288 /* 289 * Scale factor for scaled integers used to count %cpu time and load avgs. 290 * 291 * The number of CPU `tick's that map to a unique `%age' can be expressed 292 * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that 293 * can be calculated (assuming 32 bits) can be closely approximated using 294 * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15). 295 * 296 * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age', 297 * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024. 298 */ 299 #define FSHIFT 11 /* bits to right of fixed binary point */ 300 #define FSCALE (1<<FSHIFT) 301 302 #define dbtoc(db) /* calculates devblks to pages */ \ 303 ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT)) 304 305 #define ctodb(db) /* calculates pages to devblks */ \ 306 ((db) << (PAGE_SHIFT - DEV_BSHIFT)) 307 308 #endif /* _SYS_PARAM_H_ */ 309