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. 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 */
 103 #undef __DragonFly_version
 104 #define __DragonFly_version 300500      /* propagated to newvers */
 105
 106 #include <sys/_null.h>
 107
 108 #ifndef LOCORE
 109 #include <sys/types.h>
 110 #endif
 111
 112 /*
 113  * Machine-independent constants (some used in following include files).
 114  * Redefined constants are from POSIX 1003.1 limits file.
 115  *
 116  * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>)
 117  * MAXLOGNAME should be == UT_NAMESIZE+1 (see <utmp.h>)
 118  */
 119 #include <sys/syslimits.h>
 120
 121 #define MAXCOMLEN       16              /* max command name remembered */
 122 #define MAXINTERP       32              /* max interpreter file name length */
 123 #define MAXLOGNAME      17              /* max login name length (incl. NUL) */
 124 #define MAXUPRC         CHILD_MAX       /* max simultaneous processes */
 125 #define NCARGS          ARG_MAX         /* max bytes for an exec function */
 126 #define NGROUPS         NGROUPS_MAX     /* max number groups */
 127 #define NOFILE          OPEN_MAX        /* max open files per process */
 128 #define NOGROUP         65535           /* marker for empty group set member */
 129 #define MAXHOSTNAMELEN  256             /* max hostname size */
 130
 131 /* More types and definitions used throughout the kernel. */
 132 #ifdef _KERNEL
 133 #include <sys/cdefs.h>
 134 #include <sys/errno.h>
 135 #include <sys/time.h>
 136
 137 #define FALSE   0
 138 #define TRUE    1
 139 #endif
 140
 141 #ifndef _KERNEL
 142 /* Signals. */
 143 #include <sys/select.h>
 144 #include <sys/signal.h>
 145 #endif
 146
 147 /* Machine type dependent parameters. */
 148 #include <machine/param.h>
 149 #ifndef _KERNEL
 150 #include <machine/limits.h>
 151 #endif
 152
 153 #define PCATCH          0x00000100      /* tsleep checks signals */
 154 #define PUSRFLAG1       0x00000200      /* Subsystem specific flag */
 155 #define PINTERLOCKED    0x00000400      /* Interlocked tsleep */
 156 #define PWAKEUP_CPUMASK 0x00003FFF      /* start cpu for chained wakeups */
 157 #define PWAKEUP_MYCPU   0x00004000      /* wakeup on current cpu only */
 158 #define PWAKEUP_ONE     0x00008000      /* argument to wakeup: only one */
 159 #define PDOMAIN_MASK    0xFFFF0000      /* address domains for wakeup */
 160 #define PDOMAIN_UMTX    0x00010000      /* independant domain for UMTX */
 161 #define PDOMAIN_XLOCK   0x00020000      /* independant domain for fifo_lock */
 162 #define PWAKEUP_ENCODE(domain, cpu)     ((domain) | (cpu))
 163 #define PWAKEUP_DECODE(domain)          ((domain) & PWAKEUP_CPUMASK)
 164
 165 #define NZERO   0               /* default "nice" */
 166
 167 #define NBPW    sizeof(int)     /* number of bytes per word (integer) */
 168
 169 #define CMASK   022             /* default file mask: S_IWGRP|S_IWOTH */
 170 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
 171 #define NOUDEV  (udev_t)(-1)    /* non-existent device */
 172 #define NOMAJ   256             /* non-existent device */
 173 #endif
 174
 175 #ifndef _KERNEL
 176 #define NODEV   (dev_t)(-1)     /* non-existent device */
 177 #endif
 178
 179 /*
 180  * cpu_mi_feature bits
 181  */
 182 #define CPU_MI_BZERONT  0x00000001
 183 #define CPU_MI_MONITOR  0x00000010
 184
 185 /*
 186  * File system parameters and macros.
 187  *
 188  * MAXBSIZE -   Filesystems are made out of blocks of at most MAXBSIZE bytes
 189  *              per block.  MAXBSIZE may be made larger without effecting
 190  *              any existing filesystems as long as it does not exceed MAXPHYS,
 191  *              and may be made smaller at the risk of not being able to use
 192  *              filesystems which require a block size exceeding MAXBSIZE.
 193  *
 194  * BKVASIZE -   Nominal buffer space per buffer, in bytes.  BKVASIZE is the
 195  *              minimum KVM memory reservation the kernel is willing to make.
 196  *              Filesystems can of course request smaller chunks.  Actual
 197  *              backing memory uses a chunk size of a page (PAGE_SIZE).
 198  *
 199  *              If you make BKVASIZE too small you risk seriously fragmenting
 200  *              the buffer KVM map which may slow things down a bit.  If you
 201  *              make it too big the kernel will not be able to optimally use
 202  *              the KVM memory reserved for the buffer cache and will wind
 203  *              up with too-few buffers.
 204  *
 205  *              The default is 16384, roughly 2x the block size used by a
 206  *              normal UFS filesystem.
 207  */
 208 #define MAXBSIZE        65536   /* must be power of 2 */
 209 #define BKVASIZE        16384   /* must be power of 2 */
 210 #define BKVAMASK        (BKVASIZE-1)
 211 #define MAXFRAG         8
 212
 213 /*
 214  * MAXPATHLEN defines the longest permissible path length after expanding
 215  * symbolic links. It is used to allocate a temporary buffer from the buffer
 216  * pool in which to do the name expansion, hence should be a power of two,
 217  * and must be less than or equal to MAXBSIZE.  MAXSYMLINKS defines the
 218  * maximum number of symbolic links that may be expanded in a path name.
 219  * It should be set high enough to allow all legitimate uses, but halt
 220  * infinite loops reasonably quickly.
 221  */
 222 #define MAXPATHLEN      PATH_MAX
 223 #define MAXSYMLINKS     32
 224
 225 /* Bit map related macros. */
 226 #define setbit(a,i)     ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
 227 #define clrbit(a,i)     ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
 228 #define isset(a,i)      ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
 229 #define isclr(a,i)      (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
 230
 231 /* Macros for counting and rounding. */
 232 #ifndef howmany
 233 #define howmany(x, y)   (((x)+((y)-1))/(y))
 234 #endif
 235 #define rounddown(x, y) (((x)/(y))*(y))
 236 #define rounddown2(x, y) ((x) & ~((y) - 1))        /* y power of two */
 237 #define roundup(x, y)   ((((x)+((y)-1))/(y))*(y))  /* to any y */
 238 #define roundup2(x, y)  (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */
 239 #define powerof2(x)     ((((x)-1)&(x))==0)
 240
 241 /*
 242  * VM objects can be larger than the virtual address space, make sure
 243  * we don't cut-off the mask.
 244  */
 245 #define trunc_page64(x)           ((x) & ~(int64_t)PAGE_MASK)
 246 #define round_page64(x)           (((x) + PAGE_MASK) & ~(int64_t)PAGE_MASK)
 247
 248 /* Macros for min/max. */
 249 #define MIN(a,b) (((a)<(b))?(a):(b))
 250 #define MAX(a,b) (((a)>(b))?(a):(b))
 251
 252 /* Macro for array size */
 253 #define NELEM(ary)      (sizeof(ary) / sizeof((ary)[0]))
 254
 255 /*
 256  * Constants for setting the parameters of the kernel memory allocator.
 257  *
 258  * 2 ** MINBUCKET is the smallest unit of memory that will be
 259  * allocated. It must be at least large enough to hold a pointer.
 260  *
 261  * Units of memory less or equal to MAXALLOCSAVE will permanently
 262  * allocate physical memory; requests for these size pieces of
 263  * memory are quite fast. Allocations greater than MAXALLOCSAVE must
 264  * always allocate and free physical memory; requests for these
 265  * size allocations should be done infrequently as they will be slow.
 266  *
 267  * Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and
 268  * MAXALLOCSIZE must be a power of two.
 269  */
 270 #define MINBUCKET       4               /* 4 => min allocation of 16 bytes */
 271 #define MAXALLOCSAVE    (2 * PAGE_SIZE)
 272
 273 /*
 274  * Scale factor for scaled integers used to count %cpu time and load avgs.
 275  *
 276  * The number of CPU `tick's that map to a unique `%age' can be expressed
 277  * by the formula (1 / (2 ^ (FSHIFT - 11))).  The maximum load average that
 278  * can be calculated (assuming 32 bits) can be closely approximated using
 279  * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15).
 280  *
 281  * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age',
 282  * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024.
 283  */
 284 #define FSHIFT  11              /* bits to right of fixed binary point */
 285 #define FSCALE  (1<<FSHIFT)
 286
 287 #define dbtoc(db)                       /* calculates devblks to pages */ \
 288         ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT))
 289
 290 #define ctodb(db)                       /* calculates pages to devblks */ \
 291         ((db) << (PAGE_SHIFT - DEV_BSHIFT))
 292
 293 #define MJUMPAGESIZE    PAGE_SIZE       /* jumbo cluster 4k */
 294 #define MJUM9BYTES      (9 * 1024)      /* jumbo cluster 9k */
 295 #define MJUM16BYTES     (16 * 1024)     /* jumbo cluster 16k */
 296
 297 /*
 298  * MBUF Management.
 299  *
 300  * Because many drivers can't deal with multiple DMA segments all mbufs
 301  * must avoid crossing a page boundary.  While we can accomodate mbufs
 302  * which are not a power-of-2 sized kmalloc() will only guarantee
 303  * non-crossing alignment if we use a power-of-2.  256 is no longer large
 304  * enough due to m_hdr and m_pkthdr bloat.
 305  *
 306  * MCLBYTES must be a power of 2 and is typically significantly larger
 307  * than MSIZE, sufficient to hold a standard-mtu packet.  2K is considered
 308  * reasonable.
 309  */
 310 #ifndef MSIZE
 311 #define MSIZE           512             /* size of an mbuf */
 312 #endif
 313
 314 #ifndef MCLSHIFT
 315 #define MCLSHIFT        11              /* convert bytes to m_buf clusters */
 316 #endif
 317 #define MCLBYTES        (1 << MCLSHIFT) /* size of an m_buf cluster */
 318 #define MCLOFSET        (MCLBYTES - 1)  /* offset within an m_buf cluster */
 319
 320 /*
 321  * Make this available for most of the kernel.  There were too many
 322  * things that included sys/systm.h just for panic().
 323  */
 324 #ifdef _KERNEL
 325 void    panic (const char *, ...) __dead2 __printflike(1, 2);
 326 #endif
 327
 328 #ifndef htonl
 329 #define htonl(x)        __htonl(x)
 330 #endif
 331 #ifndef htons
 332 #define htons(x)        __htons(x)
 333 #endif
 334 #ifndef ntohl
 335 #define ntohl(x)        __ntohl(x)
 336 #endif
 337 #ifndef ntohs
 338 #define ntohs(x)        __ntohs(x)
 339 #endif
 340
 341 #endif  /* _SYS_PARAM_H_ */