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 */ 41 42 #ifndef _SYS_PARAM_H_ 43 #define _SYS_PARAM_H_ 44 45 #define BSD 200708 /* XXX kern.osrevision */ 46 #define BSD4_3 1 /* XXX obsolete */ 47 #define BSD4_4 1 /* XXX obsolete */ 48 49 /* 50 * __DragonFly_version number. The number doesn't really meaningfully 51 * translate to a version number. 52 * 53 * 170000 - base development version after 1.6 branch 54 * 170001 - base development version before 1.8 branch 55 * 190000 - base development version after 1.8 branch 56 * 195000 - base development version after 1.10 branch 57 * 197500 - base development version before 1.12 branch 58 * 197600 - 1.12 branch 59 * 197700 - base development version after 1.12 branch 60 * 199900 - base development version before 2.0 branch 61 * 200000 - 2.0 branch 62 * 200100 - base development version after 2.0 branch 63 * 200101 - lchflags syscall 64 * 200200 - 2.2 branch 65 * 200201 - base development version after 2.2 branch 66 * 200202 - major changes to libc 67 * 200203 - introduce PCI domain 68 * 200204 - suser() & suser_cred() removal 69 * 200205 - devfs import 70 * 200206 - *sleep() renames 71 * 200400 - 2.4 release 72 * 200500 - 2.5 master 73 * 200600 - 2.6 release 74 * 200700 - 2.7 master 75 * 200800 - 2.8 release October 2010 76 * 200900 - 2.9 master 77 * 200901 - prototype changes for alphasort(3) and scandir(3) 78 * 200902 - Xerox NS protocol removal 79 * 201000 - 2.10 release 80 * 201100 - 2.11 master 81 * 201200 - 2.12 release 82 * 201300 - 2.13 master 83 * 201301 - header rename: <vfs/gnu/ext2fs/...> -> <gnu/vfs/ext2fs/...> 84 * 201302 - header <crypt.h> is gone 85 * 201303 - <netatalk/...> and <netproto/atalk/...> are gone 86 * 201304 - Added wcscasecmp, wcsncasecmp to libc 87 * 201305 - Sync libm with NetBSD-current libm (new functions added) 88 * 201306 - Sync libm with FreeBSD-current libm (~50 new functions) 89 * 300000 - 3.0 release 90 * 300100 - 3.1 master 91 * 300101 - i4b (ISDN) removal 92 * 300102 - <sys/ata.h> is now just a link of <sys/nata.h> 93 * 300103 - if SIG_IGN is set on SIGCHLD, do not keep zombie children 94 * 300200 - 3.2 release 95 * 300300 - 3.3 master 96 * 300301 - Add eaccess syscall 97 * 300302 - fpsave changes - ucontext_t, mcontext_t, sigcontext, sigframe 98 * 300303 - Demarcation of old m4/flex with new m4/flex 99 * 300304 - Update to dialog-1.2-20121230 100 * 300400 - 3.4 release 101 * 300500 - 3.5 master 102 * 300501 - Convert libm to FreeBSD's version 103 * 300502 - GEM and i915 KMS support in kernel 104 * 300503 - Upgrade libiconv, locales, and associated libc functions 105 * 300600 - 3.6 release 106 * 300700 - 3.7 master 107 * 300701 - Relocate bus/smbus/smb.h to dev/smbus/smb/smb.h 108 */ 109 #undef __DragonFly_version 110 #define __DragonFly_version 300701 /* propagated to newvers */ 111 112 #include <sys/_null.h> 113 114 #ifndef LOCORE 115 #include <sys/types.h> 116 #endif 117 118 /* 119 * Machine-independent constants (some used in following include files). 120 * Redefined constants are from POSIX 1003.1 limits file. 121 * 122 * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>) 123 * MAXLOGNAME should be == UT_NAMESIZE+1 (see <utmp.h>) 124 */ 125 #include <sys/syslimits.h> 126 127 #define MAXCOMLEN 16 /* max command name remembered */ 128 #define MAXINTERP 32 /* max interpreter file name length */ 129 #define MAXLOGNAME 17 /* max login name length (incl. NUL) */ 130 #define MAXUPRC CHILD_MAX /* max simultaneous processes */ 131 #define NCARGS ARG_MAX /* max bytes for an exec function */ 132 #define NGROUPS NGROUPS_MAX /* max number groups */ 133 #define NOFILE OPEN_MAX /* max open files per process */ 134 #define NOGROUP 65535 /* marker for empty group set member */ 135 #define MAXHOSTNAMELEN 256 /* max hostname size */ 136 137 /* More types and definitions used throughout the kernel. */ 138 #ifdef _KERNEL 139 #include <sys/cdefs.h> 140 #include <sys/errno.h> 141 #include <sys/time.h> 142 143 #define FALSE 0 144 #define TRUE 1 145 #endif 146 147 #ifndef _KERNEL 148 /* Signals. */ 149 #include <sys/select.h> 150 #include <sys/signal.h> 151 #endif 152 153 /* Machine type dependent parameters. */ 154 #include <machine/param.h> 155 #ifndef _KERNEL 156 #include <machine/limits.h> 157 #endif 158 159 #define PCATCH 0x00000100 /* tsleep checks signals */ 160 #define PUSRFLAG1 0x00000200 /* Subsystem specific flag */ 161 #define PINTERLOCKED 0x00000400 /* Interlocked tsleep */ 162 #define PWAKEUP_CPUMASK 0x00003FFF /* start cpu for chained wakeups */ 163 #define PWAKEUP_MYCPU 0x00004000 /* wakeup on current cpu only */ 164 #define PWAKEUP_ONE 0x00008000 /* argument to wakeup: only one */ 165 #define PDOMAIN_MASK 0xFFFF0000 /* address domains for wakeup */ 166 #define PDOMAIN_UMTX 0x00010000 /* independant domain for UMTX */ 167 #define PDOMAIN_XLOCK 0x00020000 /* independant domain for fifo_lock */ 168 #define PWAKEUP_ENCODE(domain, cpu) ((domain) | (cpu)) 169 #define PWAKEUP_DECODE(domain) ((domain) & PWAKEUP_CPUMASK) 170 171 #define NZERO 0 /* default "nice" */ 172 173 #define NBPW sizeof(int) /* number of bytes per word (integer) */ 174 175 #define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */ 176 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 177 #define NOUDEV (udev_t)(-1) /* non-existent device */ 178 #define NOMAJ 256 /* non-existent device */ 179 #endif 180 181 #ifndef _KERNEL 182 #define NODEV (dev_t)(-1) /* non-existent device */ 183 #endif 184 185 /* 186 * cpu_mi_feature bits 187 */ 188 #define CPU_MI_BZERONT 0x00000001 189 #define CPU_MI_MONITOR 0x00000010 190 191 /* 192 * File system parameters and macros. 193 * 194 * MAXBSIZE - Filesystems are made out of blocks of at most MAXBSIZE bytes 195 * per block. MAXBSIZE may be made larger without effecting 196 * any existing filesystems as long as it does not exceed MAXPHYS, 197 * and may be made smaller at the risk of not being able to use 198 * filesystems which require a block size exceeding MAXBSIZE. 199 * 200 * BKVASIZE - Nominal buffer space per buffer, in bytes. BKVASIZE is the 201 * minimum KVM memory reservation the kernel is willing to make. 202 * Filesystems can of course request smaller chunks. Actual 203 * backing memory uses a chunk size of a page (PAGE_SIZE). 204 * 205 * If you make BKVASIZE too small you risk seriously fragmenting 206 * the buffer KVM map which may slow things down a bit. If you 207 * make it too big the kernel will not be able to optimally use 208 * the KVM memory reserved for the buffer cache and will wind 209 * up with too-few buffers. 210 * 211 * By default we now use maximally-sized reservations. But on 212 * 32-bit machines we reduce this 16KB. Maximally-sized 213 * reservations greatly reduces defragmentation and buffer_map 214 * messing around and is more SMP-friendly. 215 */ 216 #define MAXBSIZE 65536 /* must be power of 2 */ 217 #ifndef BKVASIZE 218 #define BKVASIZE MAXBSIZE /* must be power of 2 */ 219 #endif 220 221 #define BKVAMASK (BKVASIZE-1) 222 #define MAXFRAG 8 223 224 /* 225 * MAXPATHLEN defines the longest permissible path length after expanding 226 * symbolic links. It is used to allocate a temporary buffer from the buffer 227 * pool in which to do the name expansion, hence should be a power of two, 228 * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the 229 * maximum number of symbolic links that may be expanded in a path name. 230 * It should be set high enough to allow all legitimate uses, but halt 231 * infinite loops reasonably quickly. 232 */ 233 #define MAXPATHLEN PATH_MAX 234 #define MAXSYMLINKS 32 235 236 /* Bit map related macros. */ 237 #define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY)) 238 #define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY))) 239 #define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY))) 240 #define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0) 241 242 /* Macros for counting and rounding. */ 243 #ifndef howmany 244 #define howmany(x, y) (((x)+((y)-1))/(y)) 245 #endif 246 #define rounddown(x, y) (((x)/(y))*(y)) 247 #define rounddown2(x, y) ((x) & ~((y) - 1)) /* y power of two */ 248 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */ 249 #define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */ 250 #define powerof2(x) ((((x)-1)&(x))==0) 251 252 /* 253 * VM objects can be larger than the virtual address space, make sure 254 * we don't cut-off the mask. 255 */ 256 #define trunc_page64(x) ((x) & ~(int64_t)PAGE_MASK) 257 #define round_page64(x) (((x) + PAGE_MASK) & ~(int64_t)PAGE_MASK) 258 259 /* Macros for min/max. */ 260 #define MIN(a,b) (((a)<(b))?(a):(b)) 261 #define MAX(a,b) (((a)>(b))?(a):(b)) 262 263 /* Macro for array size */ 264 #define NELEM(ary) (sizeof(ary) / sizeof((ary)[0])) 265 266 /* 267 * Constants for setting the parameters of the kernel memory allocator. 268 * 269 * 2 ** MINBUCKET is the smallest unit of memory that will be 270 * allocated. It must be at least large enough to hold a pointer. 271 * 272 * Units of memory less or equal to MAXALLOCSAVE will permanently 273 * allocate physical memory; requests for these size pieces of 274 * memory are quite fast. Allocations greater than MAXALLOCSAVE must 275 * always allocate and free physical memory; requests for these 276 * size allocations should be done infrequently as they will be slow. 277 * 278 * Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and 279 * MAXALLOCSIZE must be a power of two. 280 */ 281 #define MINBUCKET 4 /* 4 => min allocation of 16 bytes */ 282 #define MAXALLOCSAVE (2 * PAGE_SIZE) 283 284 /* 285 * Scale factor for scaled integers used to count %cpu time and load avgs. 286 * 287 * The number of CPU `tick's that map to a unique `%age' can be expressed 288 * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that 289 * can be calculated (assuming 32 bits) can be closely approximated using 290 * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15). 291 * 292 * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age', 293 * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024. 294 */ 295 #define FSHIFT 11 /* bits to right of fixed binary point */ 296 #define FSCALE (1<<FSHIFT) 297 298 #define dbtoc(db) /* calculates devblks to pages */ \ 299 ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT)) 300 301 #define ctodb(db) /* calculates pages to devblks */ \ 302 ((db) << (PAGE_SHIFT - DEV_BSHIFT)) 303 304 #define MJUMPAGESIZE PAGE_SIZE /* jumbo cluster 4k */ 305 #define MJUM9BYTES (9 * 1024) /* jumbo cluster 9k */ 306 #define MJUM16BYTES (16 * 1024) /* jumbo cluster 16k */ 307 308 /* 309 * MBUF Management. 310 * 311 * Because many drivers can't deal with multiple DMA segments all mbufs 312 * must avoid crossing a page boundary. While we can accomodate mbufs 313 * which are not a power-of-2 sized kmalloc() will only guarantee 314 * non-crossing alignment if we use a power-of-2. 256 is no longer large 315 * enough due to m_hdr and m_pkthdr bloat. 316 * 317 * MCLBYTES must be a power of 2 and is typically significantly larger 318 * than MSIZE, sufficient to hold a standard-mtu packet. 2K is considered 319 * reasonable. 320 */ 321 #ifndef MSIZE 322 #define MSIZE 512 /* size of an mbuf */ 323 #endif 324 325 #ifndef MCLSHIFT 326 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 327 #endif 328 #define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */ 329 #define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */ 330 331 /* 332 * Make this available for most of the kernel. There were too many 333 * things that included sys/systm.h just for panic(). 334 */ 335 #ifdef _KERNEL 336 void panic (const char *, ...) __dead2 __printflike(1, 2); 337 #endif 338 339 #ifndef htonl 340 #define htonl(x) __htonl(x) 341 #endif 342 #ifndef htons 343 #define htons(x) __htons(x) 344 #endif 345 #ifndef ntohl 346 #define ntohl(x) __ntohl(x) 347 #endif 348 #ifndef ntohs 349 #define ntohs(x) __ntohs(x) 350 #endif 351 352 /* 353 * Access a variable length array that has been declared as a fixed 354 * length array. 355 */ 356 #define __PAST_END(array, offset) (((__typeof__(*(array)) *)(array))[offset]) 357 358 #endif /* _SYS_PARAM_H_ */ 359