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 1.33 2006/06/13 08:12:04 dillon Exp $ 41 */ 42 43 #ifndef _SYS_PARAM_H_ 44 #define _SYS_PARAM_H_ 45 46 #define BSD 200307 /* XXX kern.osrevision */ 47 #define BSD4_3 1 /* XXX obsolete */ 48 #define BSD4_4 1 /* XXX obsolete */ 49 50 /* 51 * __DragonFly_version number. Note that the name and comment are pattern 52 * searched from conf/newvers.sh. 53 * 54 * Version changes should be documented in: 55 * doc/en_US.ISO8859-1/books/porters-handbook/book.sgml 56 * 57 * 150002 - MSG_F* and O_F* flags (force blocking/non-blocking operation) 58 */ 59 #undef __DragonFly_version 60 #define __DragonFly_version 150002 /* Master, propagated to newvers */ 61 62 #ifdef __FreeBSD__ 63 /* 64 * __FreeBSD_version numbers for source compatibility. This is temporary 65 * along with the __FreeBSD__ define in gcc2. Note that gcc3 does not 66 * define __FreeBSD__ by default, only __DragonFly__. 67 */ 68 #undef __FreeBSD_version 69 #define __FreeBSD_version 480101 70 #endif 71 72 #ifndef NULL 73 #define NULL 0 74 #endif 75 76 #ifndef LOCORE 77 #include <sys/types.h> 78 #endif 79 80 /* 81 * Machine-independent constants (some used in following include files). 82 * Redefined constants are from POSIX 1003.1 limits file. 83 * 84 * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>) 85 * MAXLOGNAME should be == UT_NAMESIZE+1 (see <utmp.h>) 86 */ 87 #include <sys/syslimits.h> 88 89 #define MAXCOMLEN 16 /* max command name remembered */ 90 #define MAXINTERP 32 /* max interpreter file name length */ 91 #define MAXLOGNAME 17 /* max login name length (incl. NUL) */ 92 #define MAXUPRC CHILD_MAX /* max simultaneous processes */ 93 #define NCARGS ARG_MAX /* max bytes for an exec function */ 94 #define NGROUPS NGROUPS_MAX /* max number groups */ 95 #define NOFILE OPEN_MAX /* max open files per process */ 96 #define NOGROUP 65535 /* marker for empty group set member */ 97 #define MAXHOSTNAMELEN 256 /* max hostname size */ 98 99 /* More types and definitions used throughout the kernel. */ 100 #ifdef _KERNEL 101 #include <sys/cdefs.h> 102 #include <sys/errno.h> 103 #include <sys/time.h> 104 105 #define FALSE 0 106 #define TRUE 1 107 #endif 108 109 #ifndef _KERNEL 110 /* Signals. */ 111 #include <sys/signal.h> 112 #endif 113 114 /* Machine type dependent parameters. */ 115 #include <machine/param.h> 116 #ifndef _KERNEL 117 #include <machine/limits.h> 118 #endif 119 120 #define PCATCH 0x00000100 /* tsleep checks signals */ 121 #define PUSRFLAG1 0x00000200 /* Subsystem specific flag */ 122 #define PNORESCHED 0x00000400 /* No reschedule on wakeup */ 123 #define PWAKEUP_CPUMASK 0x00003FFF /* start cpu for chained wakeups */ 124 #define PWAKEUP_MYCPU 0x00004000 /* wakeup on current cpu only */ 125 #define PWAKEUP_ONE 0x00008000 /* argument to wakeup: only one */ 126 #define PDOMAIN_MASK 0xFFFF0000 /* address domains for wakeup */ 127 #define PDOMAIN_UMTX 0x00010000 /* independant domain for UMTX */ 128 #define PWAKEUP_ENCODE(domain, cpu) ((domain) | (cpu)) 129 #define PWAKEUP_DECODE(domain) ((domain) & PWAKEUP_CPUMASK) 130 131 #define NZERO 0 /* default "nice" */ 132 133 #define NBPW sizeof(int) /* number of bytes per word (integer) */ 134 135 #define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */ 136 #ifdef _KERNEL 137 #define NODEV (dev_t)(-1) /* non-existent device */ 138 #define NOUDEV (udev_t)(-1) /* non-existent device */ 139 #define NOMAJ 256 /* non-existent device */ 140 #else 141 #define NODEV (dev_t)(-1) /* non-existent device */ 142 #endif 143 144 /* 145 * File system parameters and macros. 146 * 147 * MAXBSIZE - Filesystems are made out of blocks of at most MAXBSIZE bytes 148 * per block. MAXBSIZE may be made larger without effecting 149 * any existing filesystems as long as it does not exceed MAXPHYS, 150 * and may be made smaller at the risk of not being able to use 151 * filesystems which require a block size exceeding MAXBSIZE. 152 * 153 * BKVASIZE - Nominal buffer space per buffer, in bytes. BKVASIZE is the 154 * minimum KVM memory reservation the kernel is willing to make. 155 * Filesystems can of course request smaller chunks. Actual 156 * backing memory uses a chunk size of a page (PAGE_SIZE). 157 * 158 * If you make BKVASIZE too small you risk seriously fragmenting 159 * the buffer KVM map which may slow things down a bit. If you 160 * make it too big the kernel will not be able to optimally use 161 * the KVM memory reserved for the buffer cache and will wind 162 * up with too-few buffers. 163 * 164 * The default is 16384, roughly 2x the block size used by a 165 * normal UFS filesystem. 166 */ 167 #define MAXBSIZE 65536 /* must be power of 2 */ 168 #define BKVASIZE 16384 /* must be power of 2 */ 169 #define BKVAMASK (BKVASIZE-1) 170 #define MAXFRAG 8 171 172 /* 173 * MAXPATHLEN defines the longest permissible path length after expanding 174 * symbolic links. It is used to allocate a temporary buffer from the buffer 175 * pool in which to do the name expansion, hence should be a power of two, 176 * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the 177 * maximum number of symbolic links that may be expanded in a path name. 178 * It should be set high enough to allow all legitimate uses, but halt 179 * infinite loops reasonably quickly. 180 */ 181 #define MAXPATHLEN PATH_MAX 182 #define MAXSYMLINKS 32 183 184 /* Bit map related macros. */ 185 #define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY)) 186 #define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY))) 187 #define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY))) 188 #define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0) 189 190 /* Macros for counting and rounding. */ 191 #ifndef howmany 192 #define howmany(x, y) (((x)+((y)-1))/(y)) 193 #endif 194 #define rounddown(x, y) (((x)/(y))*(y)) 195 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */ 196 #define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */ 197 #define powerof2(x) ((((x)-1)&(x))==0) 198 199 /* Macros for min/max. */ 200 #define MIN(a,b) (((a)<(b))?(a):(b)) 201 #define MAX(a,b) (((a)>(b))?(a):(b)) 202 203 /* 204 * Constants for setting the parameters of the kernel memory allocator. 205 * 206 * 2 ** MINBUCKET is the smallest unit of memory that will be 207 * allocated. It must be at least large enough to hold a pointer. 208 * 209 * Units of memory less or equal to MAXALLOCSAVE will permanently 210 * allocate physical memory; requests for these size pieces of 211 * memory are quite fast. Allocations greater than MAXALLOCSAVE must 212 * always allocate and free physical memory; requests for these 213 * size allocations should be done infrequently as they will be slow. 214 * 215 * Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and 216 * MAXALLOCSIZE must be a power of two. 217 */ 218 #define MINBUCKET 4 /* 4 => min allocation of 16 bytes */ 219 #define MAXALLOCSAVE (2 * PAGE_SIZE) 220 221 /* 222 * Scale factor for scaled integers used to count %cpu time and load avgs. 223 * 224 * The number of CPU `tick's that map to a unique `%age' can be expressed 225 * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that 226 * can be calculated (assuming 32 bits) can be closely approximated using 227 * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15). 228 * 229 * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age', 230 * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024. 231 */ 232 #define FSHIFT 11 /* bits to right of fixed binary point */ 233 #define FSCALE (1<<FSHIFT) 234 235 #define dbtoc(db) /* calculates devblks to pages */ \ 236 ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT)) 237 238 #define ctodb(db) /* calculates pages to devblks */ \ 239 ((db) << (PAGE_SHIFT - DEV_BSHIFT)) 240 241 242 /* 243 * Make this available for most of the kernel. There were too many 244 * things that included sys/systm.h just for panic(). 245 */ 246 #ifdef _KERNEL 247 void panic (const char *, ...) __dead2 __printflike(1, 2); 248 #endif 249 250 #ifndef htonl 251 #define htonl(x) __htonl(x) 252 #endif 253 #ifndef htons 254 #define htons(x) __htons(x) 255 #endif 256 #ifndef ntohl 257 #define ntohl(x) __ntohl(x) 258 #endif 259 #ifndef ntohs 260 #define ntohs(x) __ntohs(x) 261 #endif 262 263 #endif /* _SYS_PARAM_H_ */ 264