sys/sys/param.h

   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. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  *      @(#)param.h     8.3 (Berkeley) 4/4/95
  35  * $FreeBSD: src/sys/sys/param.h,v 1.61.2.38 2003/05/22 17:12:01 fjoe Exp $
  36  */
  37
  38 #ifndef _SYS_PARAM_H_
  39 #define _SYS_PARAM_H_
  40
  41 #define BSD     200708          /* XXX kern.osrevision */
  42 #define BSD4_3  1               /* XXX obsolete */
  43 #define BSD4_4  1               /* XXX obsolete */
  44
  45 /*
  46  * __DragonFly_version number.  The number doesn't really meaningfully
  47  * translate to a version number.
  48  *
  49  * 170000 - base development version after 1.6 branch
  50  * 170001 - base development version before 1.8 branch
  51  * 190000 - base development version after 1.8 branch
  52  * 195000 - base development version after 1.10 branch
  53  * 197500 - base development version before 1.12 branch
  54  * 197600 - 1.12 branch
  55  * 197700 - base development version after 1.12 branch
  56  * 199900 - base development version before 2.0 branch
  57  * 200000 - 2.0 branch
  58  * 200100 - base development version after 2.0 branch
  59  * 200101 - lchflags syscall
  60  * 200200 - 2.2 branch
  61  * 200201 - base development version after 2.2 branch
  62  * 200202 - major changes to libc
  63  * 200203 - introduce PCI domain
  64  * 200204 - suser() & suser_cred() removal
  65  * 200205 - devfs import
  66  * 200206 - *sleep() renames
  67  * 200400 - 2.4 release
  68  * 200500 - 2.5 master
  69  * 200600 - 2.6 release
  70  * 200700 - 2.7 master
  71  * 200800 - 2.8 release                 October 2010
  72  * 200900 - 2.9 master
  73  * 200901 - prototype changes for alphasort(3) and scandir(3)
  74  * 200902 - Xerox NS protocol removal
  75  * 201000 - 2.10 release
  76  * 201100 - 2.11 master
  77  * 201200 - 2.12 release
  78  * 201300 - 2.13 master
  79  * 201301 - header rename: <vfs/gnu/ext2fs/...> -> <gnu/vfs/ext2fs/...>
  80  * 201302 - header <crypt.h> is gone
  81  * 201303 - <netatalk/...> and <netproto/atalk/...> are gone
  82  * 201304 - Added wcscasecmp, wcsncasecmp to libc
  83  * 201305 - Sync libm with NetBSD-current libm (new functions added)
  84  * 201306 - Sync libm with FreeBSD-current libm (~50 new functions)
  85  * 300000 - 3.0 release
  86  * 300100 - 3.1 master
  87  * 300101 - i4b (ISDN) removal
  88  * 300102 - <sys/ata.h> is now just a link of <sys/nata.h>
  89  * 300103 - if SIG_IGN is set on SIGCHLD, do not keep zombie children
  90  * 300200 - 3.2 release
  91  * 300300 - 3.3 master
  92  * 300301 - Add eaccess syscall
  93  * 300302 - fpsave changes - ucontext_t, mcontext_t, sigcontext, sigframe
  94  * 300303 - Demarcation of old m4/flex with new m4/flex
  95  * 300304 - Update to dialog-1.2-20121230
  96  * 300400 - 3.4 release
  97  * 300500 - 3.5 master
  98  * 300501 - Convert libm to FreeBSD's version
  99  * 300502 - GEM and i915 KMS support in kernel
 100  * 300503 - Upgrade libiconv, locales, and associated libc functions
 101  * 300600 - 3.6 release
 102  * 300700 - 3.7 master
 103  * 300701 - Relocate bus/smbus/smb.h to dev/smbus/smb/smb.h
 104  * 300702 - drm/i915 update
 105  * 300703 - Make usb4bsd default
 106  * 300704 - Removal of IPX, NCP and NWFS support
 107  * 300705 - Removal of ATM support.
 108  * 300800 - 3.8 release
 109  * 300900 - 3.9 master
 110  * 300901 - drm/i915 hardware context support added
 111  * 400000 - 4.0 release
 112  * 400100 - 4.1 development
 113  * 400101 - Removal of SCTP support.
 114  * 400102 - Sound system update from FreeBSD
 115  * 400103 - Milestone - availability of gcc50 in base
 116  * 400104 - struct lwp_params (a public struct) members renaming
 117  * 400105 - Switch to gcc50 as the primary compiler
 118  * 400106 - Added pipe2() system call
 119  * 400107 - Add futimens() and utimensat() syscalls
 120  * 400200 - 4.2 release
 121  * 400300 - 4.3 development
 122  * 400301 - posix compliant iconv (no const qualifier)
 123  * 400302 - Replacement of libm with OpenBSD's libm
 124  * 400303 - environ and __progname are no longer linkable symbols
 125  * 400304 - Activate symbol versioning for libc.so (still on version 8)
 126  * 400305 - Add accept4() system call
 127  * 400306 - Add libexecinfo to base
 128  * 400307 - drm/i915 kernel module renamed to i915.ko
 129  * 400308 - <malloc.h> removal
 130  * 400309 - Add lwp_setname() system call
 131  * 400400 - 4.4 release
 132  * 400500 - 4.5 development
 133  * 400501 - unionfs removal
 134  * 400502 - private libraries: ssh ldns edit ncurses
 135  * 400503 - libarchive-3.0.2 import (add bsdcat)
 136  * 400600 - 4.6 release
 137  * 400700 - 4.7 development
 138  * 400701 - getline() visibility changes
 139  * 400702 - private library: libressl
 140  * 400703 - resolved conflicts of md, crypt and ressl libraries
 141  * 400704 - binutils update to 2.27
 142  * 400705 - lwp_{set,get}affinity()
 143  */
 144 #undef __DragonFly_version
 145 #define __DragonFly_version 400705      /* propagated to newvers */
 146
 147 #include <sys/_null.h>
 148
 149 #ifndef LOCORE
 150 #include <sys/types.h>
 151 #endif
 152
 153 /*
 154  * Machine-independent constants (some used in following include files).
 155  * Redefined constants are from POSIX 1003.1 limits file.
 156  *
 157  * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>)
 158  * MAXLOGNAME should be == UT_NAMESIZE+1 (see <utmp.h>)
 159  */
 160 #include <sys/syslimits.h>
 161
 162 #define MAXCOMLEN       16              /* max command name remembered */
 163 #define MAXINTERP       32              /* max interpreter file name length */
 164 #define MAXLOGNAME      17              /* max login name length (incl. NUL) */
 165 #define MAXUPRC         CHILD_MAX       /* max simultaneous processes */
 166 #define NCARGS          ARG_MAX         /* max bytes for an exec function */
 167 #define NGROUPS         NGROUPS_MAX     /* max number groups */
 168 #define NOFILE          OPEN_MAX        /* max open files per process */
 169 #define NOGROUP         65535           /* marker for empty group set member */
 170 #define MAXHOSTNAMELEN  256             /* max hostname size */
 171
 172 /* More types and definitions used throughout the kernel. */
 173 #ifdef _KERNEL
 174 #include <sys/cdefs.h>
 175 #include <sys/errno.h>
 176 #include <sys/time.h>
 177
 178 #define FALSE   0
 179 #define TRUE    1
 180 #endif
 181
 182 #ifndef _KERNEL
 183 /* Signals. */
 184 #include <sys/select.h>
 185 #include <sys/signal.h>
 186 #endif
 187
 188 /* Machine type dependent parameters. */
 189 #include <machine/param.h>
 190 #ifndef _KERNEL
 191 #include <machine/limits.h>
 192 #endif
 193
 194 /*
 195  * WARNING! Max supported cpu's due to PWAKEUP_CPUMASK is 16384.
 196  */
 197 #define PCATCH          0x00000100      /* tsleep checks signals */
 198 #define PUSRFLAG1       0x00000200      /* Subsystem specific flag */
 199 #define PINTERLOCKED    0x00000400      /* Interlocked tsleep */
 200 #define PWAKEUP_CPUMASK 0x00003FFF      /* start cpu for chained wakeups */
 201 #define PWAKEUP_MYCPU   0x00004000      /* wakeup on current cpu only */
 202 #define PWAKEUP_ONE     0x00008000      /* argument to wakeup: only one */
 203 #define PDOMAIN_MASK    0xFFFF0000      /* address domains for wakeup */
 204 #define PDOMAIN_UMTX    0x00010000      /* independant domain for UMTX */
 205 #define PDOMAIN_XLOCK   0x00020000      /* independant domain for fifo_lock */
 206 #define PWAKEUP_ENCODE(domain, cpu)     ((domain) | (cpu))
 207 #define PWAKEUP_DECODE(domain)          ((domain) & PWAKEUP_CPUMASK)
 208
 209 #define NZERO   0               /* default "nice" */
 210
 211 #define NBPW    sizeof(int)     /* number of bytes per word (integer) */
 212
 213 #define CMASK   022             /* default file mask: S_IWGRP|S_IWOTH */
 214 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
 215 #define NOUDEV  (udev_t)(-1)    /* non-existent device */
 216 #define NOMAJ   256             /* non-existent device */
 217 #endif
 218
 219 #ifndef _KERNEL
 220 #define NODEV   (dev_t)(-1)     /* non-existent device */
 221 #endif
 222
 223 /*
 224  * cpu_mi_feature bits
 225  */
 226 #define CPU_MI_BZERONT  0x00000001
 227 #define CPU_MI_MONITOR  0x00000010
 228
 229 /*
 230  * File system parameters and macros.
 231  *
 232  * MAXBSIZE -   Filesystems are made out of blocks of at most MAXBSIZE bytes
 233  *              per block.  MAXBSIZE may be made larger without effecting
 234  *              any existing filesystems as long as it does not exceed MAXPHYS,
 235  *              and may be made smaller at the risk of not being able to use
 236  *              filesystems which require a block size exceeding MAXBSIZE.
 237  *
 238  * NBUFCALCSIZE - Calculate sufficient buffer cache buffers for the memory
 239  *              desired as if each buffer were sized to this value (actual
 240  *              real memory use).  Hysteresis works both ways.
 241  */
 242 #define MAXBSIZE        65536           /* must be power of 2 */
 243 #define NBUFCALCSIZE    16384           /* for nbuf calculation only */
 244
 245 #define MAXFRAG         8
 246
 247 /*
 248  * MAXPATHLEN defines the longest permissible path length after expanding
 249  * symbolic links. It is used to allocate a temporary buffer from the buffer
 250  * pool in which to do the name expansion, hence should be a power of two,
 251  * and must be less than or equal to MAXBSIZE.  MAXSYMLINKS defines the
 252  * maximum number of symbolic links that may be expanded in a path name.
 253  * It should be set high enough to allow all legitimate uses, but halt
 254  * infinite loops reasonably quickly.
 255  */
 256 #define MAXPATHLEN      PATH_MAX
 257 #define MAXSYMLINKS     32
 258
 259 /* Bit map related macros. */
 260 #define setbit(a,i)     ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
 261 #define clrbit(a,i)     ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
 262 #define isset(a,i)      ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
 263 #define isclr(a,i)      (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
 264
 265 /* Macros for counting and rounding. */
 266 #ifndef howmany
 267 #define howmany(x, y)   (((x)+((y)-1))/(y))
 268 #endif
 269 #define nitems(x)       (sizeof((x)) / sizeof((x)[0]))
 270 #define rounddown(x, y) (((x)/(y))*(y))
 271 #define rounddown2(x, y) ((x) & ~((y) - 1))        /* y power of two */
 272 #define roundup(x, y)   ((((x)+((y)-1))/(y))*(y))  /* to any y */
 273 #define roundup2(x, y)  (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */
 274 #define powerof2(x)     ((((x)-1)&(x))==0)
 275
 276 /*
 277  * VM objects can be larger than the virtual address space, make sure
 278  * we don't cut-off the mask.
 279  */
 280 #define trunc_page64(x)           ((x) & ~(int64_t)PAGE_MASK)
 281 #define round_page64(x)           (((x) + PAGE_MASK) & ~(int64_t)PAGE_MASK)
 282
 283 /* Macros for min/max. */
 284 #define MIN(a,b) (((a)<(b))?(a):(b))
 285 #define MAX(a,b) (((a)>(b))?(a):(b))
 286
 287 /* Macro for array size */
 288 #define NELEM(ary)      (sizeof(ary) / sizeof((ary)[0]))
 289
 290 /*
 291  * Constants for setting the parameters of the kernel memory allocator.
 292  *
 293  * 2 ** MINBUCKET is the smallest unit of memory that will be
 294  * allocated. It must be at least large enough to hold a pointer.
 295  *
 296  * Units of memory less or equal to MAXALLOCSAVE will permanently
 297  * allocate physical memory; requests for these size pieces of
 298  * memory are quite fast. Allocations greater than MAXALLOCSAVE must
 299  * always allocate and free physical memory; requests for these
 300  * size allocations should be done infrequently as they will be slow.
 301  *
 302  * Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and
 303  * MAXALLOCSIZE must be a power of two.
 304  */
 305 #define MINBUCKET       4               /* 4 => min allocation of 16 bytes */
 306 #define MAXALLOCSAVE    (2 * PAGE_SIZE)
 307
 308 /*
 309  * Scale factor for scaled integers used to count %cpu time and load avgs.
 310  *
 311  * The number of CPU `tick's that map to a unique `%age' can be expressed
 312  * by the formula (1 / (2 ^ (FSHIFT - 11))).  The maximum load average that
 313  * can be calculated (assuming 32 bits) can be closely approximated using
 314  * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15).
 315  *
 316  * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age',
 317  * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024.
 318  */
 319 #define FSHIFT  11              /* bits to right of fixed binary point */
 320 #define FSCALE  (1<<FSHIFT)
 321
 322 #define dbtoc(db)                       /* calculates devblks to pages */ \
 323         ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT))
 324
 325 #define ctodb(db)                       /* calculates pages to devblks */ \
 326         ((db) << (PAGE_SHIFT - DEV_BSHIFT))
 327
 328 #define MJUMPAGESIZE    PAGE_SIZE       /* jumbo cluster 4k */
 329 #define MJUM9BYTES      (9 * 1024)      /* jumbo cluster 9k */
 330 #define MJUM16BYTES     (16 * 1024)     /* jumbo cluster 16k */
 331
 332 /*
 333  * MBUF Management.
 334  *
 335  * Because many drivers can't deal with multiple DMA segments all mbufs
 336  * must avoid crossing a page boundary.  While we can accomodate mbufs
 337  * which are not a power-of-2 sized kmalloc() will only guarantee
 338  * non-crossing alignment if we use a power-of-2.  256 is no longer large
 339  * enough due to m_hdr and m_pkthdr bloat.
 340  *
 341  * MCLBYTES must be a power of 2 and is typically significantly larger
 342  * than MSIZE, sufficient to hold a standard-mtu packet.  2K is considered
 343  * reasonable.
 344  */
 345 #ifndef MSIZE
 346 #define MSIZE           512             /* size of an mbuf */
 347 #endif
 348
 349 #ifndef MCLSHIFT
 350 #define MCLSHIFT        11              /* convert bytes to m_buf clusters */
 351 #endif
 352 #define MCLBYTES        (1 << MCLSHIFT) /* size of an m_buf cluster */
 353 #define MCLOFSET        (MCLBYTES - 1)  /* offset within an m_buf cluster */
 354
 355 /*
 356  * Make this available for most of the kernel.  There were too many
 357  * things that included sys/systm.h just for panic().
 358  */
 359 #ifdef _KERNEL
 360 void    panic (const char *, ...) __dead2 __printflike(1, 2);
 361 #endif
 362
 363 #ifndef htonl
 364 #define htonl(x)        __htonl(x)
 365 #endif
 366 #ifndef htons
 367 #define htons(x)        __htons(x)
 368 #endif
 369 #ifndef ntohl
 370 #define ntohl(x)        __ntohl(x)
 371 #endif
 372 #ifndef ntohs
 373 #define ntohs(x)        __ntohs(x)
 374 #endif
 375
 376 /*
 377  * Access a variable length array that has been declared as a fixed
 378  * length array.
 379  */
 380 #define __PAST_END(array, offset) (((__typeof__(*(array)) *)(array))[offset])
 381
 382 #endif  /* _SYS_PARAM_H_ */