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 * 300702 - drm/i915 update 109 */ 110 #undef __DragonFly_version 111 #define __DragonFly_version 300702 /* propagated to newvers */ 112 113 #include <sys/_null.h> 114 115 #ifndef LOCORE 116 #include <sys/types.h> 117 #endif 118 119 /* 120 * Machine-independent constants (some used in following include files). 121 * Redefined constants are from POSIX 1003.1 limits file. 122 * 123 * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>) 124 * MAXLOGNAME should be == UT_NAMESIZE+1 (see <utmp.h>) 125 */ 126 #include <sys/syslimits.h> 127 128 #define MAXCOMLEN 16 /* max command name remembered */ 129 #define MAXINTERP 32 /* max interpreter file name length */ 130 #define MAXLOGNAME 17 /* max login name length (incl. NUL) */ 131 #define MAXUPRC CHILD_MAX /* max simultaneous processes */ 132 #define NCARGS ARG_MAX /* max bytes for an exec function */ 133 #define NGROUPS NGROUPS_MAX /* max number groups */ 134 #define NOFILE OPEN_MAX /* max open files per process */ 135 #define NOGROUP 65535 /* marker for empty group set member */ 136 #define MAXHOSTNAMELEN 256 /* max hostname size */ 137 138 /* More types and definitions used throughout the kernel. */ 139 #ifdef _KERNEL 140 #include <sys/cdefs.h> 141 #include <sys/errno.h> 142 #include <sys/time.h> 143 144 #define FALSE 0 145 #define TRUE 1 146 #endif 147 148 #ifndef _KERNEL 149 /* Signals. */ 150 #include <sys/select.h> 151 #include <sys/signal.h> 152 #endif 153 154 /* Machine type dependent parameters. */ 155 #include <machine/param.h> 156 #ifndef _KERNEL 157 #include <machine/limits.h> 158 #endif 159 160 #define PCATCH 0x00000100 /* tsleep checks signals */ 161 #define PUSRFLAG1 0x00000200 /* Subsystem specific flag */ 162 #define PINTERLOCKED 0x00000400 /* Interlocked tsleep */ 163 #define PWAKEUP_CPUMASK 0x00003FFF /* start cpu for chained wakeups */ 164 #define PWAKEUP_MYCPU 0x00004000 /* wakeup on current cpu only */ 165 #define PWAKEUP_ONE 0x00008000 /* argument to wakeup: only one */ 166 #define PDOMAIN_MASK 0xFFFF0000 /* address domains for wakeup */ 167 #define PDOMAIN_UMTX 0x00010000 /* independant domain for UMTX */ 168 #define PDOMAIN_XLOCK 0x00020000 /* independant domain for fifo_lock */ 169 #define PWAKEUP_ENCODE(domain, cpu) ((domain) | (cpu)) 170 #define PWAKEUP_DECODE(domain) ((domain) & PWAKEUP_CPUMASK) 171 172 #define NZERO 0 /* default "nice" */ 173 174 #define NBPW sizeof(int) /* number of bytes per word (integer) */ 175 176 #define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */ 177 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 178 #define NOUDEV (udev_t)(-1) /* non-existent device */ 179 #define NOMAJ 256 /* non-existent device */ 180 #endif 181 182 #ifndef _KERNEL 183 #define NODEV (dev_t)(-1) /* non-existent device */ 184 #endif 185 186 /* 187 * cpu_mi_feature bits 188 */ 189 #define CPU_MI_BZERONT 0x00000001 190 #define CPU_MI_MONITOR 0x00000010 191 192 /* 193 * File system parameters and macros. 194 * 195 * MAXBSIZE - Filesystems are made out of blocks of at most MAXBSIZE bytes 196 * per block. MAXBSIZE may be made larger without effecting 197 * any existing filesystems as long as it does not exceed MAXPHYS, 198 * and may be made smaller at the risk of not being able to use 199 * filesystems which require a block size exceeding MAXBSIZE. 200 * 201 * BKVASIZE - Nominal buffer space per buffer, in bytes. BKVASIZE is the 202 * minimum KVM memory reservation the kernel is willing to make. 203 * Filesystems can of course request smaller chunks. Actual 204 * backing memory uses a chunk size of a page (PAGE_SIZE). 205 * 206 * If you make BKVASIZE too small you risk seriously fragmenting 207 * the buffer KVM map which may slow things down a bit. If you 208 * make it too big the kernel will not be able to optimally use 209 * the KVM memory reserved for the buffer cache and will wind 210 * up with too-few buffers. 211 * 212 * By default we now use maximally-sized reservations. But on 213 * 32-bit machines we reduce this 16KB. Maximally-sized 214 * reservations greatly reduces defragmentation and buffer_map 215 * messing around and is more SMP-friendly. 216 */ 217 #define MAXBSIZE 65536 /* must be power of 2 */ 218 #ifndef BKVASIZE 219 #define BKVASIZE MAXBSIZE /* must be power of 2 */ 220 #endif 221 222 #define BKVAMASK (BKVASIZE-1) 223 #define MAXFRAG 8 224 225 /* 226 * MAXPATHLEN defines the longest permissible path length after expanding 227 * symbolic links. It is used to allocate a temporary buffer from the buffer 228 * pool in which to do the name expansion, hence should be a power of two, 229 * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the 230 * maximum number of symbolic links that may be expanded in a path name. 231 * It should be set high enough to allow all legitimate uses, but halt 232 * infinite loops reasonably quickly. 233 */ 234 #define MAXPATHLEN PATH_MAX 235 #define MAXSYMLINKS 32 236 237 /* Bit map related macros. */ 238 #define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY)) 239 #define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY))) 240 #define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY))) 241 #define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0) 242 243 /* Macros for counting and rounding. */ 244 #ifndef howmany 245 #define howmany(x, y) (((x)+((y)-1))/(y)) 246 #endif 247 #define rounddown(x, y) (((x)/(y))*(y)) 248 #define rounddown2(x, y) ((x) & ~((y) - 1)) /* y power of two */ 249 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */ 250 #define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */ 251 #define powerof2(x) ((((x)-1)&(x))==0) 252 253 /* 254 * VM objects can be larger than the virtual address space, make sure 255 * we don't cut-off the mask. 256 */ 257 #define trunc_page64(x) ((x) & ~(int64_t)PAGE_MASK) 258 #define round_page64(x) (((x) + PAGE_MASK) & ~(int64_t)PAGE_MASK) 259 260 /* Macros for min/max. */ 261 #define MIN(a,b) (((a)<(b))?(a):(b)) 262 #define MAX(a,b) (((a)>(b))?(a):(b)) 263 264 /* Macro for array size */ 265 #define NELEM(ary) (sizeof(ary) / sizeof((ary)[0])) 266 267 /* 268 * Constants for setting the parameters of the kernel memory allocator. 269 * 270 * 2 ** MINBUCKET is the smallest unit of memory that will be 271 * allocated. It must be at least large enough to hold a pointer. 272 * 273 * Units of memory less or equal to MAXALLOCSAVE will permanently 274 * allocate physical memory; requests for these size pieces of 275 * memory are quite fast. Allocations greater than MAXALLOCSAVE must 276 * always allocate and free physical memory; requests for these 277 * size allocations should be done infrequently as they will be slow. 278 * 279 * Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and 280 * MAXALLOCSIZE must be a power of two. 281 */ 282 #define MINBUCKET 4 /* 4 => min allocation of 16 bytes */ 283 #define MAXALLOCSAVE (2 * PAGE_SIZE) 284 285 /* 286 * Scale factor for scaled integers used to count %cpu time and load avgs. 287 * 288 * The number of CPU `tick's that map to a unique `%age' can be expressed 289 * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that 290 * can be calculated (assuming 32 bits) can be closely approximated using 291 * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15). 292 * 293 * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age', 294 * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024. 295 */ 296 #define FSHIFT 11 /* bits to right of fixed binary point */ 297 #define FSCALE (1<<FSHIFT) 298 299 #define dbtoc(db) /* calculates devblks to pages */ \ 300 ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT)) 301 302 #define ctodb(db) /* calculates pages to devblks */ \ 303 ((db) << (PAGE_SHIFT - DEV_BSHIFT)) 304 305 #define MJUMPAGESIZE PAGE_SIZE /* jumbo cluster 4k */ 306 #define MJUM9BYTES (9 * 1024) /* jumbo cluster 9k */ 307 #define MJUM16BYTES (16 * 1024) /* jumbo cluster 16k */ 308 309 /* 310 * MBUF Management. 311 * 312 * Because many drivers can't deal with multiple DMA segments all mbufs 313 * must avoid crossing a page boundary. While we can accomodate mbufs 314 * which are not a power-of-2 sized kmalloc() will only guarantee 315 * non-crossing alignment if we use a power-of-2. 256 is no longer large 316 * enough due to m_hdr and m_pkthdr bloat. 317 * 318 * MCLBYTES must be a power of 2 and is typically significantly larger 319 * than MSIZE, sufficient to hold a standard-mtu packet. 2K is considered 320 * reasonable. 321 */ 322 #ifndef MSIZE 323 #define MSIZE 512 /* size of an mbuf */ 324 #endif 325 326 #ifndef MCLSHIFT 327 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */ 328 #endif 329 #define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */ 330 #define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */ 331 332 /* 333 * Make this available for most of the kernel. There were too many 334 * things that included sys/systm.h just for panic(). 335 */ 336 #ifdef _KERNEL 337 void panic (const char *, ...) __dead2 __printflike(1, 2); 338 #endif 339 340 #ifndef htonl 341 #define htonl(x) __htonl(x) 342 #endif 343 #ifndef htons 344 #define htons(x) __htons(x) 345 #endif 346 #ifndef ntohl 347 #define ntohl(x) __ntohl(x) 348 #endif 349 #ifndef ntohs 350 #define ntohs(x) __ntohs(x) 351 #endif 352 353 /* 354 * Access a variable length array that has been declared as a fixed 355 * length array. 356 */ 357 #define __PAST_END(array, offset) (((__typeof__(*(array)) *)(array))[offset]) 358 359 #endif /* _SYS_PARAM_H_ */ 360