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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)param.h 8.3 (Berkeley) 4/4/95 39 * $FreeBSD: src/sys/sys/param.h,v 1.61.2.38 2003/05/22 17:12:01 fjoe Exp $ 40 * $DragonFly: src/sys/sys/param.h,v 1.53 2008/11/11 00:55:49 pavalos Exp $ 41 */ 42 43 #ifndef _SYS_PARAM_H_ 44 #define _SYS_PARAM_H_ 45 46 #define BSD 200708 /* XXX kern.osrevision */ 47 #define BSD4_3 1 /* XXX obsolete */ 48 #define BSD4_4 1 /* XXX obsolete */ 49 50 /* 51 * __DragonFly_version number. The number doesn't really meaningfully 52 * translate to a version number. 53 * 54 * 170000 - base development version after 1.6 branch 55 * 170001 - base development version before 1.8 branch 56 * 190000 - base development version after 1.8 branch 57 * 195000 - base development version after 1.10 branch 58 * 197500 - base development version before 1.12 branch 59 * 197600 - 1.12 branch 60 * 197700 - base development version after 1.12 branch 61 * 199900 - base development version before 2.0 branch 62 * 200000 - 2.0 branch 63 * 200100 - base development version after 2.0 branch 64 * 200101 - lchflags syscall 65 * 200200 - 2.2 branch 66 * 200201 - base development version after 2.2 branch 67 * 200202 - major changes to libc 68 */ 69 #undef __DragonFly_version 70 #define __DragonFly_version 200202 /* Master, propagated to newvers */ 71 72 #ifdef __FreeBSD__ 73 /* 74 * __FreeBSD_version numbers for source compatibility. This is temporary 75 * along with the __FreeBSD__ define in gcc2. Note that gcc3 does not 76 * define __FreeBSD__ by default, only __DragonFly__. 77 */ 78 #undef __FreeBSD_version 79 #define __FreeBSD_version 480101 80 #endif 81 82 #include <sys/_null.h> 83 84 #ifndef LOCORE 85 #include <sys/types.h> 86 #endif 87 88 /* 89 * Machine-independent constants (some used in following include files). 90 * Redefined constants are from POSIX 1003.1 limits file. 91 * 92 * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>) 93 * MAXLOGNAME should be == UT_NAMESIZE+1 (see <utmp.h>) 94 */ 95 #include <sys/syslimits.h> 96 97 #define MAXCOMLEN 16 /* max command name remembered */ 98 #define MAXINTERP 32 /* max interpreter file name length */ 99 #define MAXLOGNAME 17 /* 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 /* 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 */ 106 107 /* More types and definitions used throughout the kernel. */ 108 #ifdef _KERNEL 109 #include <sys/cdefs.h> 110 #include <sys/errno.h> 111 #include <sys/time.h> 112 113 #define FALSE 0 114 #define TRUE 1 115 #endif 116 117 #ifndef _KERNEL 118 /* Signals. */ 119 #include <sys/select.h> 120 #include <sys/signal.h> 121 #endif 122 123 /* Machine type dependent parameters. */ 124 #include <machine/param.h> 125 #ifndef _KERNEL 126 #include <machine/limits.h> 127 #endif 128 129 #define PCATCH 0x00000100 /* tsleep checks signals */ 130 #define PUSRFLAG1 0x00000200 /* Subsystem specific flag */ 131 #define PWAKEUP_CPUMASK 0x00003FFF /* start cpu for chained wakeups */ 132 #define PWAKEUP_MYCPU 0x00004000 /* wakeup on current cpu only */ 133 #define PWAKEUP_ONE 0x00008000 /* argument to wakeup: only one */ 134 #define PDOMAIN_MASK 0xFFFF0000 /* address domains for wakeup */ 135 #define PDOMAIN_UMTX 0x00010000 /* independant domain for UMTX */ 136 #define PWAKEUP_ENCODE(domain, cpu) ((domain) | (cpu)) 137 #define PWAKEUP_DECODE(domain) ((domain) & PWAKEUP_CPUMASK) 138 139 #define NZERO 0 /* default "nice" */ 140 141 #define NBPW sizeof(int) /* number of bytes per word (integer) */ 142 143 #define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */ 144 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 145 #define NOUDEV (udev_t)(-1) /* non-existent device */ 146 #define NOMAJ 256 /* non-existent device */ 147 #endif 148 149 #ifndef _KERNEL 150 #define NODEV (dev_t)(-1) /* non-existent device */ 151 #endif 152 153 /* 154 * File system parameters and macros. 155 * 156 * MAXBSIZE - Filesystems are made out of blocks of at most MAXBSIZE bytes 157 * per block. MAXBSIZE may be made larger without effecting 158 * any existing filesystems as long as it does not exceed MAXPHYS, 159 * and may be made smaller at the risk of not being able to use 160 * filesystems which require a block size exceeding MAXBSIZE. 161 * 162 * BKVASIZE - Nominal buffer space per buffer, in bytes. BKVASIZE is the 163 * minimum KVM memory reservation the kernel is willing to make. 164 * Filesystems can of course request smaller chunks. Actual 165 * backing memory uses a chunk size of a page (PAGE_SIZE). 166 * 167 * If you make BKVASIZE too small you risk seriously fragmenting 168 * the buffer KVM map which may slow things down a bit. If you 169 * make it too big the kernel will not be able to optimally use 170 * the KVM memory reserved for the buffer cache and will wind 171 * up with too-few buffers. 172 * 173 * The default is 16384, roughly 2x the block size used by a 174 * normal UFS filesystem. 175 */ 176 #define MAXBSIZE 65536 /* must be power of 2 */ 177 #define BKVASIZE 16384 /* must be power of 2 */ 178 #define BKVAMASK (BKVASIZE-1) 179 #define MAXFRAG 8 180 181 /* 182 * MAXPATHLEN defines the longest permissible path length after expanding 183 * symbolic links. It is used to allocate a temporary buffer from the buffer 184 * pool in which to do the name expansion, hence should be a power of two, 185 * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the 186 * maximum number of symbolic links that may be expanded in a path name. 187 * It should be set high enough to allow all legitimate uses, but halt 188 * infinite loops reasonably quickly. 189 */ 190 #define MAXPATHLEN PATH_MAX 191 #define MAXSYMLINKS 32 192 193 /* Bit map related macros. */ 194 #define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY)) 195 #define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY))) 196 #define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY))) 197 #define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0) 198 199 /* Macros for counting and rounding. */ 200 #ifndef howmany 201 #define howmany(x, y) (((x)+((y)-1))/(y)) 202 #endif 203 #define rounddown(x, y) (((x)/(y))*(y)) 204 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */ 205 #define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */ 206 #define powerof2(x) ((((x)-1)&(x))==0) 207 208 /* Macros for min/max. */ 209 #define MIN(a,b) (((a)<(b))?(a):(b)) 210 #define MAX(a,b) (((a)>(b))?(a):(b)) 211 212 /* 213 * Constants for setting the parameters of the kernel memory allocator. 214 * 215 * 2 ** MINBUCKET is the smallest unit of memory that will be 216 * allocated. It must be at least large enough to hold a pointer. 217 * 218 * Units of memory less or equal to MAXALLOCSAVE will permanently 219 * allocate physical memory; requests for these size pieces of 220 * memory are quite fast. Allocations greater than MAXALLOCSAVE must 221 * always allocate and free physical memory; requests for these 222 * size allocations should be done infrequently as they will be slow. 223 * 224 * Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and 225 * MAXALLOCSIZE must be a power of two. 226 */ 227 #define MINBUCKET 4 /* 4 => min allocation of 16 bytes */ 228 #define MAXALLOCSAVE (2 * PAGE_SIZE) 229 230 /* 231 * Scale factor for scaled integers used to count %cpu time and load avgs. 232 * 233 * The number of CPU `tick's that map to a unique `%age' can be expressed 234 * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that 235 * can be calculated (assuming 32 bits) can be closely approximated using 236 * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15). 237 * 238 * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age', 239 * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024. 240 */ 241 #define FSHIFT 11 /* bits to right of fixed binary point */ 242 #define FSCALE (1<<FSHIFT) 243 244 #define dbtoc(db) /* calculates devblks to pages */ \ 245 ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT)) 246 247 #define ctodb(db) /* calculates pages to devblks */ \ 248 ((db) << (PAGE_SHIFT - DEV_BSHIFT)) 249 250 251 /* 252 * Make this available for most of the kernel. There were too many 253 * things that included sys/systm.h just for panic(). 254 */ 255 #ifdef _KERNEL 256 void panic (const char *, ...) __dead2 __printflike(1, 2); 257 #endif 258 259 #ifndef htonl 260 #define htonl(x) __htonl(x) 261 #endif 262 #ifndef htons 263 #define htons(x) __htons(x) 264 #endif 265 #ifndef ntohl 266 #define ntohl(x) __ntohl(x) 267 #endif 268 #ifndef ntohs 269 #define ntohs(x) __ntohs(x) 270 #endif 271 272 #endif /* _SYS_PARAM_H_ */ 273