1 /* $OpenBSD: param.h,v 1.142 2024/02/17 16:13:24 deraadt Exp $ */ 2 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 #define BSD 199306 /* System version (year & month). */ 41 #define BSD4_3 1 42 #define BSD4_4 1 43 44 #define OpenBSD 202404 /* OpenBSD version (year & month). */ 45 #define OpenBSD7_5 1 /* OpenBSD 7.5 */ 46 47 #include <sys/_null.h> 48 49 #ifndef _LOCORE 50 #include <sys/types.h> 51 #endif 52 53 /* 54 * Machine-independent constants (some used in following include files). 55 * Redefined constants are from POSIX 1003.1 limits file. 56 * 57 * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>) 58 * MAXLOGNAME should be >= UT_NAMESIZE (see <utmp.h>) 59 */ 60 #include <sys/syslimits.h> 61 62 #define MAXCOMLEN _MAXCOMLEN-1 /* max command name remembered, without NUL */ 63 #define MAXINTERP 128 /* max interpreter file name length */ 64 #define MAXLOGNAME LOGIN_NAME_MAX /* max login name length w/ NUL */ 65 #define MAXUPRC CHILD_MAX /* max simultaneous processes */ 66 #define NCARGS ARG_MAX /* max bytes for an exec function */ 67 #define NGROUPS NGROUPS_MAX /* max number groups */ 68 #define NOFILE OPEN_MAX /* max open files per process (soft) */ 69 #define NOFILE_MAX 1024 /* max open files per process (hard) */ 70 #define NOGROUP 65535 /* marker for empty group set member */ 71 #define MAXHOSTNAMELEN 256 /* max hostname length w/ NUL */ 72 73 /* More types and definitions used throughout the kernel. */ 74 #ifdef _KERNEL 75 #include <sys/errno.h> 76 #include <sys/time.h> 77 #include <sys/resource.h> 78 #include <sys/ucred.h> 79 #include <sys/uio.h> 80 #include <sys/srp.h> 81 #endif 82 83 /* Signals. */ 84 #include <sys/signal.h> 85 86 /* Machine type dependent parameters. */ 87 #include <sys/limits.h> 88 #include <machine/param.h> 89 90 #ifdef _KERNEL 91 /* 92 * Priorities. Note that with 32 run queues, differences less than 4 are 93 * insignificant. 94 */ 95 #define PSWP 0 96 #define PVM 4 97 #define PINOD 8 98 #define PRIBIO 16 99 #define PVFS 20 100 #endif /* _KERNEL */ 101 #define PZERO 22 /* No longer magic, shouldn't be here. XXX */ 102 #ifdef _KERNEL 103 #define PSOCK 24 104 #define PWAIT 32 105 #define PLOCK 36 106 #define PPAUSE 40 107 #define PUSER 50 108 #define MAXPRI 127 /* Priorities range from 0 through MAXPRI. */ 109 110 #define PRIMASK 0x0ff 111 #define PCATCH 0x100 /* OR'd with pri for tsleep to check signals */ 112 #define PNORELOCK 0x200 /* OR'd with pri for msleep to not reacquire 113 the mutex */ 114 #endif /* _KERNEL */ 115 116 #define NODEV (dev_t)(-1) /* non-existent device */ 117 118 #define ALIGNBYTES _ALIGNBYTES 119 #define ALIGN(p) _ALIGN(p) 120 #define ALIGNED_POINTER(p,t) _ALIGNED_POINTER(p,t) 121 122 /* 123 * File system parameters and macros. 124 * 125 * The file system is made out of blocks of at most MAXBSIZE units, with 126 * smaller units (fragments) only in the last direct block. MAXBSIZE 127 * primarily determines the size of buffers in the buffer pool. It may be 128 * made larger without any effect on existing file systems; however making 129 * it smaller makes some file systems unmountable. 130 */ 131 #ifdef _KERNEL 132 #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */ 133 #endif /* _KERNEL */ 134 #define MAXBSIZE (64 * 1024) 135 136 #define _DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 137 #define DEV_BSIZE (1 << _DEV_BSHIFT) 138 #ifdef _KERNEL 139 #define DEV_BSHIFT _DEV_BSHIFT 140 #define BLKDEV_IOSIZE PAGE_SIZE 141 #endif /* _KERNEL */ 142 143 /* pages to disk blocks */ 144 #ifndef ctod 145 #define ctod(x) ((x) << (PAGE_SHIFT - _DEV_BSHIFT)) 146 #endif 147 #ifndef dtoc 148 #define dtoc(x) ((x) >> (PAGE_SHIFT - _DEV_BSHIFT)) 149 #endif 150 151 /* bytes to disk blocks */ 152 #ifndef btodb 153 #define btodb(x) ((x) >> _DEV_BSHIFT) 154 #endif 155 #ifndef dbtob 156 #define dbtob(x) ((x) << _DEV_BSHIFT) 157 #endif 158 159 /* 160 * MAXPATHLEN defines the longest permissible path length after expanding 161 * symbolic links. It is used to allocate a temporary buffer from the buffer 162 * pool in which to do the name expansion, hence should be a power of two, 163 * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the 164 * maximum number of symbolic links that may be expanded in a path name. 165 * It should be set high enough to allow all legitimate uses, but halt 166 * infinite loops reasonably quickly. 167 */ 168 #define MAXPATHLEN PATH_MAX 169 #define MAXSYMLINKS SYMLOOP_MAX 170 171 /* Macros to set/clear/test flags. */ 172 #ifdef _KERNEL 173 #define SET(t, f) ((t) |= (f)) 174 #define CLR(t, f) ((t) &= ~(f)) 175 #define ISSET(t, f) ((t) & (f)) 176 #endif /* _KERNEL */ 177 178 /* Bit map related macros. */ 179 #define setbit(a,i) ((a)[(i)>>3] |= 1<<((i)&(NBBY-1))) 180 #define clrbit(a,i) ((a)[(i)>>3] &= ~(1<<((i)&(NBBY-1)))) 181 #define isset(a,i) ((a)[(i)>>3] & (1<<((i)&(NBBY-1)))) 182 #define isclr(a,i) (((a)[(i)>>3] & (1<<((i)&(NBBY-1)))) == 0) 183 184 /* Macros for counting and rounding. */ 185 #ifndef howmany 186 #define howmany(x, y) (((x)+((y)-1))/(y)) 187 #endif 188 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) 189 #define powerof2(x) ((((x)-1)&(x))==0) 190 191 /* Macros for min/max. */ 192 #define MIN(a,b) (((a)<(b))?(a):(b)) 193 #define MAX(a,b) (((a)>(b))?(a):(b)) 194 195 /* Macros for calculating the offset of a field */ 196 #if !defined(offsetof) && defined(_KERNEL) 197 #if __GNUC_PREREQ__(4, 0) 198 #define offsetof(s, e) __builtin_offsetof(s, e) 199 #else 200 #define offsetof(s, e) ((size_t)&((s *)0)->e) 201 #endif 202 #endif /* !defined(offsetof) && defined(_KERNEL) */ 203 204 #define nitems(_a) (sizeof((_a)) / sizeof((_a)[0])) 205 206 /* 207 * Scale factor for scaled integers used to count %cpu time and load avgs. 208 * 209 * The number of CPU `tick's that map to a unique `%age' can be expressed 210 * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that 211 * can be calculated (assuming 32 bits) can be closely approximated using 212 * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15). 213 * 214 * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age', 215 * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024. 216 */ 217 #define _FSHIFT 11 /* bits to right of fixed binary point */ 218 #ifdef _KERNEL 219 #define FSHIFT _FSHIFT 220 #endif 221 #define FSCALE (1<<_FSHIFT) 222 223 #endif /* !_SYS_PARAM_H_ */ 224