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 * 200902 - Xerox NS protocol removal 80 */ 81 #undef __DragonFly_version 82 #define __DragonFly_version 200902 /* propagated to newvers */ 83 84 #include <sys/_null.h> 85 86 #ifndef LOCORE 87 #include <sys/types.h> 88 #endif 89 90 /* 91 * Machine-independent constants (some used in following include files). 92 * Redefined constants are from POSIX 1003.1 limits file. 93 * 94 * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>) 95 * MAXLOGNAME should be == UT_NAMESIZE+1 (see <utmp.h>) 96 */ 97 #include <sys/syslimits.h> 98 99 #define MAXCOMLEN 16 /* max command name remembered */ 100 #define MAXINTERP 32 /* max interpreter file name length */ 101 #define MAXLOGNAME 17 /* max login name length (incl. NUL) */ 102 #define MAXUPRC CHILD_MAX /* max simultaneous processes */ 103 #define NCARGS ARG_MAX /* max bytes for an exec function */ 104 #define NGROUPS NGROUPS_MAX /* max number groups */ 105 #define NOFILE OPEN_MAX /* max open files per process */ 106 #define NOGROUP 65535 /* marker for empty group set member */ 107 #define MAXHOSTNAMELEN 256 /* max hostname size */ 108 109 /* More types and definitions used throughout the kernel. */ 110 #ifdef _KERNEL 111 #include <sys/cdefs.h> 112 #include <sys/errno.h> 113 #include <sys/time.h> 114 115 #define FALSE 0 116 #define TRUE 1 117 #endif 118 119 #ifndef _KERNEL 120 /* Signals. */ 121 #include <sys/select.h> 122 #include <sys/signal.h> 123 #endif 124 125 /* Machine type dependent parameters. */ 126 #include <machine/param.h> 127 #ifndef _KERNEL 128 #include <machine/limits.h> 129 #endif 130 131 #define PCATCH 0x00000100 /* tsleep checks signals */ 132 #define PUSRFLAG1 0x00000200 /* Subsystem specific flag */ 133 #define PINTERLOCKED 0x00000400 /* Interlocked tsleep */ 134 #define PWAKEUP_CPUMASK 0x00003FFF /* start cpu for chained wakeups */ 135 #define PWAKEUP_MYCPU 0x00004000 /* wakeup on current cpu only */ 136 #define PWAKEUP_ONE 0x00008000 /* argument to wakeup: only one */ 137 #define PDOMAIN_MASK 0xFFFF0000 /* address domains for wakeup */ 138 #define PDOMAIN_UMTX 0x00010000 /* independant domain for UMTX */ 139 #define PWAKEUP_ENCODE(domain, cpu) ((domain) | (cpu)) 140 #define PWAKEUP_DECODE(domain) ((domain) & PWAKEUP_CPUMASK) 141 142 #define NZERO 0 /* default "nice" */ 143 144 #define NBPW sizeof(int) /* number of bytes per word (integer) */ 145 146 #define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */ 147 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 148 #define NOUDEV (udev_t)(-1) /* non-existent device */ 149 #define NOMAJ 256 /* non-existent device */ 150 #endif 151 152 #ifndef _KERNEL 153 #define NODEV (dev_t)(-1) /* non-existent device */ 154 #endif 155 156 /* 157 * cpu_mi_feature bits 158 */ 159 #define CPU_MI_BZERONT 0x00000001 160 #define CPU_MI_MONITOR 0x00000010 161 162 /* 163 * File system parameters and macros. 164 * 165 * MAXBSIZE - Filesystems are made out of blocks of at most MAXBSIZE bytes 166 * per block. MAXBSIZE may be made larger without effecting 167 * any existing filesystems as long as it does not exceed MAXPHYS, 168 * and may be made smaller at the risk of not being able to use 169 * filesystems which require a block size exceeding MAXBSIZE. 170 * 171 * BKVASIZE - Nominal buffer space per buffer, in bytes. BKVASIZE is the 172 * minimum KVM memory reservation the kernel is willing to make. 173 * Filesystems can of course request smaller chunks. Actual 174 * backing memory uses a chunk size of a page (PAGE_SIZE). 175 * 176 * If you make BKVASIZE too small you risk seriously fragmenting 177 * the buffer KVM map which may slow things down a bit. If you 178 * make it too big the kernel will not be able to optimally use 179 * the KVM memory reserved for the buffer cache and will wind 180 * up with too-few buffers. 181 * 182 * The default is 16384, roughly 2x the block size used by a 183 * normal UFS filesystem. 184 */ 185 #define MAXBSIZE 65536 /* must be power of 2 */ 186 #define BKVASIZE 16384 /* must be power of 2 */ 187 #define BKVAMASK (BKVASIZE-1) 188 #define MAXFRAG 8 189 190 /* 191 * MAXPATHLEN defines the longest permissible path length after expanding 192 * symbolic links. It is used to allocate a temporary buffer from the buffer 193 * pool in which to do the name expansion, hence should be a power of two, 194 * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the 195 * maximum number of symbolic links that may be expanded in a path name. 196 * It should be set high enough to allow all legitimate uses, but halt 197 * infinite loops reasonably quickly. 198 */ 199 #define MAXPATHLEN PATH_MAX 200 #define MAXSYMLINKS 32 201 202 /* Bit map related macros. */ 203 #define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY)) 204 #define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY))) 205 #define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY))) 206 #define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0) 207 208 /* Macros for counting and rounding. */ 209 #ifndef howmany 210 #define howmany(x, y) (((x)+((y)-1))/(y)) 211 #endif 212 #define rounddown(x, y) (((x)/(y))*(y)) 213 #define rounddown2(x, y) ((x) & ~((y) - 1)) /* y power of two */ 214 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */ 215 #define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */ 216 #define powerof2(x) ((((x)-1)&(x))==0) 217 218 /* 219 * VM objects can be larger than the virtual address space, make sure 220 * we don't cut-off the mask. 221 */ 222 #define trunc_page64(x) ((x) & ~(int64_t)PAGE_MASK) 223 #define round_page64(x) (((x) + PAGE_MASK) & ~(int64_t)PAGE_MASK) 224 225 /* Macros for min/max. */ 226 #define MIN(a,b) (((a)<(b))?(a):(b)) 227 #define MAX(a,b) (((a)>(b))?(a):(b)) 228 229 /* Macro for array size */ 230 #define NELEM(ary) (sizeof(ary) / sizeof((ary))[0]) 231 232 /* 233 * Constants for setting the parameters of the kernel memory allocator. 234 * 235 * 2 ** MINBUCKET is the smallest unit of memory that will be 236 * allocated. It must be at least large enough to hold a pointer. 237 * 238 * Units of memory less or equal to MAXALLOCSAVE will permanently 239 * allocate physical memory; requests for these size pieces of 240 * memory are quite fast. Allocations greater than MAXALLOCSAVE must 241 * always allocate and free physical memory; requests for these 242 * size allocations should be done infrequently as they will be slow. 243 * 244 * Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and 245 * MAXALLOCSIZE must be a power of two. 246 */ 247 #define MINBUCKET 4 /* 4 => min allocation of 16 bytes */ 248 #define MAXALLOCSAVE (2 * PAGE_SIZE) 249 250 /* 251 * Scale factor for scaled integers used to count %cpu time and load avgs. 252 * 253 * The number of CPU `tick's that map to a unique `%age' can be expressed 254 * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that 255 * can be calculated (assuming 32 bits) can be closely approximated using 256 * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15). 257 * 258 * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age', 259 * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024. 260 */ 261 #define FSHIFT 11 /* bits to right of fixed binary point */ 262 #define FSCALE (1<<FSHIFT) 263 264 #define dbtoc(db) /* calculates devblks to pages */ \ 265 ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT)) 266 267 #define ctodb(db) /* calculates pages to devblks */ \ 268 ((db) << (PAGE_SHIFT - DEV_BSHIFT)) 269 270 #define MJUMPAGESIZE PAGE_SIZE /* jumbo cluster 4k */ 271 #define MJUM9BYTES (9 * 1024) /* jumbo cluster 9k */ 272 #define MJUM16BYTES (16 * 1024) /* jumbo cluster 16k */ 273 274 /* 275 * MBUF Management. 276 * 277 * Because many drivers can't deal with multiple DMA segments all mbufs 278 * must avoid crossing a page boundary. While we can accomodate mbufs 279 * which are not a power-of-2 sized kmalloc() will only guarantee 280 * non-crossing alignment if we use a power-of-2. 256 is no longer large 281 * enough due to m_hdr and m_pkthdr bloat. 282 * 283 * MCLBYTES must be a power of 2 and is typically significantly larger 284 * than MSIZE, sufficient to hold a standard-mtu packet. 2K is considered 285 * reasonable. 286 */ 287 #ifndef MSIZE 288 #define MSIZE 512 /* size of an mbuf */ 289 #endif 290 291 #ifndef MCLSHIFT 292 #define MCLSHIFT 12 /* convert bytes to m_buf clusters */ 293 #endif 294 #define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */ 295 #define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */ 296 297 /* 298 * Make this available for most of the kernel. There were too many 299 * things that included sys/systm.h just for panic(). 300 */ 301 #ifdef _KERNEL 302 void panic (const char *, ...) __dead2 __printflike(1, 2); 303 #endif 304 305 #ifndef htonl 306 #define htonl(x) __htonl(x) 307 #endif 308 #ifndef htons 309 #define htons(x) __htons(x) 310 #endif 311 #ifndef ntohl 312 #define ntohl(x) __ntohl(x) 313 #endif 314 #ifndef ntohs 315 #define ntohs(x) __ntohs(x) 316 #endif 317 318 #endif /* _SYS_PARAM_H_ */ 319