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 * 200203 - introduce PCI domain 69 * 200204 - suser() & suser_cred() removal 70 * 200205 - devfs import 71 * 200206 - *sleep() renames 72 * 200400 - 2.4 release 73 * 200500 - 2.5 master 74 * 200600 - 2.6 release 75 * 200700 - 2.7 master 76 * 200800 - 2.8 release October 2010 77 * 200900 - 2.9 master 78 * 200901 - prototype changes for alphasort(3) and scandir(3) 79 */ 80 #undef __DragonFly_version 81 #define __DragonFly_version 200901 /* propagated to newvers */ 82 83 #include <sys/_null.h> 84 85 #ifndef LOCORE 86 #include <sys/types.h> 87 #endif 88 89 /* 90 * Machine-independent constants (some used in following include files). 91 * Redefined constants are from POSIX 1003.1 limits file. 92 * 93 * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>) 94 * MAXLOGNAME should be == UT_NAMESIZE+1 (see <utmp.h>) 95 */ 96 #include <sys/syslimits.h> 97 98 #define MAXCOMLEN 16 /* max command name remembered */ 99 #define MAXINTERP 32 /* max interpreter file name length */ 100 #define MAXLOGNAME 17 /* max login name length (incl. NUL) */ 101 #define MAXUPRC CHILD_MAX /* max simultaneous processes */ 102 #define NCARGS ARG_MAX /* max bytes for an exec function */ 103 #define NGROUPS NGROUPS_MAX /* max number groups */ 104 #define NOFILE OPEN_MAX /* max open files per process */ 105 #define NOGROUP 65535 /* marker for empty group set member */ 106 #define MAXHOSTNAMELEN 256 /* max hostname size */ 107 108 /* More types and definitions used throughout the kernel. */ 109 #ifdef _KERNEL 110 #include <sys/cdefs.h> 111 #include <sys/errno.h> 112 #include <sys/time.h> 113 114 #define FALSE 0 115 #define TRUE 1 116 #endif 117 118 #ifndef _KERNEL 119 /* Signals. */ 120 #include <sys/select.h> 121 #include <sys/signal.h> 122 #endif 123 124 /* Machine type dependent parameters. */ 125 #include <machine/param.h> 126 #ifndef _KERNEL 127 #include <machine/limits.h> 128 #endif 129 130 #define PCATCH 0x00000100 /* tsleep checks signals */ 131 #define PUSRFLAG1 0x00000200 /* Subsystem specific flag */ 132 #define PINTERLOCKED 0x00000400 /* Interlocked tsleep */ 133 #define PWAKEUP_CPUMASK 0x00003FFF /* start cpu for chained wakeups */ 134 #define PWAKEUP_MYCPU 0x00004000 /* wakeup on current cpu only */ 135 #define PWAKEUP_ONE 0x00008000 /* argument to wakeup: only one */ 136 #define PDOMAIN_MASK 0xFFFF0000 /* address domains for wakeup */ 137 #define PDOMAIN_UMTX 0x00010000 /* independant domain for UMTX */ 138 #define PWAKEUP_ENCODE(domain, cpu) ((domain) | (cpu)) 139 #define PWAKEUP_DECODE(domain) ((domain) & PWAKEUP_CPUMASK) 140 141 #define NZERO 0 /* default "nice" */ 142 143 #define NBPW sizeof(int) /* number of bytes per word (integer) */ 144 145 #define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */ 146 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 147 #define NOUDEV (udev_t)(-1) /* non-existent device */ 148 #define NOMAJ 256 /* non-existent device */ 149 #endif 150 151 #ifndef _KERNEL 152 #define NODEV (dev_t)(-1) /* non-existent device */ 153 #endif 154 155 /* 156 * cpu_mi_feature bits 157 */ 158 #define CPU_MI_BZERONT 0x00000001 159 160 /* 161 * File system parameters and macros. 162 * 163 * MAXBSIZE - Filesystems are made out of blocks of at most MAXBSIZE bytes 164 * per block. MAXBSIZE may be made larger without effecting 165 * any existing filesystems as long as it does not exceed MAXPHYS, 166 * and may be made smaller at the risk of not being able to use 167 * filesystems which require a block size exceeding MAXBSIZE. 168 * 169 * BKVASIZE - Nominal buffer space per buffer, in bytes. BKVASIZE is the 170 * minimum KVM memory reservation the kernel is willing to make. 171 * Filesystems can of course request smaller chunks. Actual 172 * backing memory uses a chunk size of a page (PAGE_SIZE). 173 * 174 * If you make BKVASIZE too small you risk seriously fragmenting 175 * the buffer KVM map which may slow things down a bit. If you 176 * make it too big the kernel will not be able to optimally use 177 * the KVM memory reserved for the buffer cache and will wind 178 * up with too-few buffers. 179 * 180 * The default is 16384, roughly 2x the block size used by a 181 * normal UFS filesystem. 182 */ 183 #define MAXBSIZE 65536 /* must be power of 2 */ 184 #define BKVASIZE 16384 /* must be power of 2 */ 185 #define BKVAMASK (BKVASIZE-1) 186 #define MAXFRAG 8 187 188 /* 189 * MAXPATHLEN defines the longest permissible path length after expanding 190 * symbolic links. It is used to allocate a temporary buffer from the buffer 191 * pool in which to do the name expansion, hence should be a power of two, 192 * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the 193 * maximum number of symbolic links that may be expanded in a path name. 194 * It should be set high enough to allow all legitimate uses, but halt 195 * infinite loops reasonably quickly. 196 */ 197 #define MAXPATHLEN PATH_MAX 198 #define MAXSYMLINKS 32 199 200 /* Bit map related macros. */ 201 #define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY)) 202 #define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY))) 203 #define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY))) 204 #define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0) 205 206 /* Macros for counting and rounding. */ 207 #ifndef howmany 208 #define howmany(x, y) (((x)+((y)-1))/(y)) 209 #endif 210 #define rounddown(x, y) (((x)/(y))*(y)) 211 #define rounddown2(x, y) ((x) & ~((y) - 1)) /* y power of two */ 212 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */ 213 #define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */ 214 #define powerof2(x) ((((x)-1)&(x))==0) 215 216 /* 217 * VM objects can be larger than the virtual address space, make sure 218 * we don't cut-off the mask. 219 */ 220 #define trunc_page64(x) ((x) & ~(int64_t)PAGE_MASK) 221 #define round_page64(x) (((x) + PAGE_MASK) & ~(int64_t)PAGE_MASK) 222 223 /* Macros for min/max. */ 224 #define MIN(a,b) (((a)<(b))?(a):(b)) 225 #define MAX(a,b) (((a)>(b))?(a):(b)) 226 227 /* 228 * Constants for setting the parameters of the kernel memory allocator. 229 * 230 * 2 ** MINBUCKET is the smallest unit of memory that will be 231 * allocated. It must be at least large enough to hold a pointer. 232 * 233 * Units of memory less or equal to MAXALLOCSAVE will permanently 234 * allocate physical memory; requests for these size pieces of 235 * memory are quite fast. Allocations greater than MAXALLOCSAVE must 236 * always allocate and free physical memory; requests for these 237 * size allocations should be done infrequently as they will be slow. 238 * 239 * Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and 240 * MAXALLOCSIZE must be a power of two. 241 */ 242 #define MINBUCKET 4 /* 4 => min allocation of 16 bytes */ 243 #define MAXALLOCSAVE (2 * PAGE_SIZE) 244 245 /* 246 * Scale factor for scaled integers used to count %cpu time and load avgs. 247 * 248 * The number of CPU `tick's that map to a unique `%age' can be expressed 249 * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that 250 * can be calculated (assuming 32 bits) can be closely approximated using 251 * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15). 252 * 253 * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age', 254 * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024. 255 */ 256 #define FSHIFT 11 /* bits to right of fixed binary point */ 257 #define FSCALE (1<<FSHIFT) 258 259 #define dbtoc(db) /* calculates devblks to pages */ \ 260 ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT)) 261 262 #define ctodb(db) /* calculates pages to devblks */ \ 263 ((db) << (PAGE_SHIFT - DEV_BSHIFT)) 264 265 #define MJUMPAGESIZE PAGE_SIZE /* jumbo cluster 4k */ 266 #define MJUM9BYTES (9 * 1024) /* jumbo cluster 9k */ 267 #define MJUM16BYTES (16 * 1024) /* jumbo cluster 16k */ 268 269 /* 270 * MBUF Management. 271 * 272 * Because many drivers can't deal with multiple DMA segments all mbufs 273 * must avoid crossing a page boundary. While we can accomodate mbufs 274 * which are not a power-of-2 sized kmalloc() will only guarantee 275 * non-crossing alignment if we use a power-of-2. 256 is no longer large 276 * enough due to m_hdr and m_pkthdr bloat. 277 * 278 * MCLBYTES must be a power of 2 and is typically significantly larger 279 * than MSIZE, sufficient to hold a standard-mtu packet. 2K is considered 280 * reasonable. 281 */ 282 #ifndef MSIZE 283 #define MSIZE 512 /* size of an mbuf */ 284 #endif 285 286 #ifndef MCLSHIFT 287 #define MCLSHIFT 12 /* convert bytes to m_buf clusters */ 288 #endif 289 #define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */ 290 #define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */ 291 292 /* 293 * Make this available for most of the kernel. There were too many 294 * things that included sys/systm.h just for panic(). 295 */ 296 #ifdef _KERNEL 297 void panic (const char *, ...) __dead2 __printflike(1, 2); 298 #endif 299 300 #ifndef htonl 301 #define htonl(x) __htonl(x) 302 #endif 303 #ifndef htons 304 #define htons(x) __htons(x) 305 #endif 306 #ifndef ntohl 307 #define ntohl(x) __ntohl(x) 308 #endif 309 #ifndef ntohs 310 #define ntohs(x) __ntohs(x) 311 #endif 312 313 #endif /* _SYS_PARAM_H_ */ 314