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  * $DragonFly: src/sys/sys/param.h,v 1.43 2007/07/24 20:38:19 dillon 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.   Note that the name and comment are pattern
  52  * searched from conf/newvers.sh.
  53  *
  54  * Version changes should be documented in:
  55  *      doc/en_US.ISO8859-1/books/porters-handbook/book.sgml
  56  *
  57  * 170000 - base development version after 1.6 branch
  58  * 170001 - base development version before 1.8 branch
  59  * 190000 - base development version after 1.8 branch
  60  * 195000 - base development version after 1.10 branch
  61  */
  62 #undef __DragonFly_version
  63 #define __DragonFly_version 197000      /* Master, propagated to newvers */
  64
  65 #ifdef __FreeBSD__
  66 /*
  67  * __FreeBSD_version numbers for source compatibility.  This is temporary
  68  * along with the __FreeBSD__ define in gcc2.  Note that gcc3 does not
  69  * define __FreeBSD__ by default, only __DragonFly__.
  70  */
  71 #undef __FreeBSD_version
  72 #define __FreeBSD_version 480101
  73 #endif
  74
  75 #ifndef NULL
  76 #define NULL    0
  77 #endif
  78
  79 #ifndef LOCORE
  80 #include <sys/types.h>
  81 #endif
  82
  83 /*
  84  * Machine-independent constants (some used in following include files).
  85  * Redefined constants are from POSIX 1003.1 limits file.
  86  *
  87  * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>)
  88  * MAXLOGNAME should be == UT_NAMESIZE+1 (see <utmp.h>)
  89  */
  90 #include <sys/syslimits.h>
  91
  92 #define MAXCOMLEN       16              /* max command name remembered */
  93 #define MAXINTERP       32              /* max interpreter file name length */
  94 #define MAXLOGNAME      17              /* max login name length (incl. NUL) */
  95 #define MAXUPRC         CHILD_MAX       /* max simultaneous processes */
  96 #define NCARGS          ARG_MAX         /* max bytes for an exec function */
  97 #define NGROUPS         NGROUPS_MAX     /* max number groups */
  98 #define NOFILE          OPEN_MAX        /* max open files per process */
  99 #define NOGROUP         65535           /* marker for empty group set member */
 100 #define MAXHOSTNAMELEN  256             /* max hostname size */
 101
 102 /* More types and definitions used throughout the kernel. */
 103 #ifdef _KERNEL
 104 #include <sys/cdefs.h>
 105 #include <sys/errno.h>
 106 #include <sys/time.h>
 107
 108 #define FALSE   0
 109 #define TRUE    1
 110 #endif
 111
 112 #ifndef _KERNEL
 113 /* Signals. */
 114 #include <sys/signal.h>
 115 #endif
 116
 117 /* Machine type dependent parameters. */
 118 #include <machine/param.h>
 119 #ifndef _KERNEL
 120 #include <machine/limits.h>
 121 #endif
 122
 123 #define PCATCH          0x00000100      /* tsleep checks signals */
 124 #define PUSRFLAG1       0x00000200      /* Subsystem specific flag */
 125 #define PNORESCHED      0x00000400      /* No reschedule on wakeup */
 126 #define PWAKEUP_CPUMASK 0x00003FFF      /* start cpu for chained wakeups */
 127 #define PWAKEUP_MYCPU   0x00004000      /* wakeup on current cpu only */
 128 #define PWAKEUP_ONE     0x00008000      /* argument to wakeup: only one */
 129 #define PDOMAIN_MASK    0xFFFF0000      /* address domains for wakeup */
 130 #define PDOMAIN_UMTX    0x00010000      /* independant domain for UMTX */
 131 #define PWAKEUP_ENCODE(domain, cpu)     ((domain) | (cpu))
 132 #define PWAKEUP_DECODE(domain)          ((domain) & PWAKEUP_CPUMASK)
 133
 134 #define NZERO   0               /* default "nice" */
 135
 136 #define NBPW    sizeof(int)     /* number of bytes per word (integer) */
 137
 138 #define CMASK   022             /* default file mask: S_IWGRP|S_IWOTH */
 139 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
 140 #define NOUDEV  (udev_t)(-1)    /* non-existent device */
 141 #define NOMAJ   256             /* non-existent device */
 142 #endif
 143
 144 #ifndef _KERNEL
 145 #define NODEV   (dev_t)(-1)     /* non-existent device */
 146 #endif
 147
 148 /*
 149  * File system parameters and macros.
 150  *
 151  * MAXBSIZE -   Filesystems are made out of blocks of at most MAXBSIZE bytes
 152  *              per block.  MAXBSIZE may be made larger without effecting
 153  *              any existing filesystems as long as it does not exceed MAXPHYS,
 154  *              and may be made smaller at the risk of not being able to use
 155  *              filesystems which require a block size exceeding MAXBSIZE.
 156  *
 157  * BKVASIZE -   Nominal buffer space per buffer, in bytes.  BKVASIZE is the
 158  *              minimum KVM memory reservation the kernel is willing to make.
 159  *              Filesystems can of course request smaller chunks.  Actual
 160  *              backing memory uses a chunk size of a page (PAGE_SIZE).
 161  *
 162  *              If you make BKVASIZE too small you risk seriously fragmenting
 163  *              the buffer KVM map which may slow things down a bit.  If you
 164  *              make it too big the kernel will not be able to optimally use
 165  *              the KVM memory reserved for the buffer cache and will wind
 166  *              up with too-few buffers.
 167  *
 168  *              The default is 16384, roughly 2x the block size used by a
 169  *              normal UFS filesystem.
 170  */
 171 #define MAXBSIZE        65536   /* must be power of 2 */
 172 #define BKVASIZE        16384   /* must be power of 2 */
 173 #define BKVAMASK        (BKVASIZE-1)
 174 #define MAXFRAG         8
 175
 176 /*
 177  * MAXPATHLEN defines the longest permissible path length after expanding
 178  * symbolic links. It is used to allocate a temporary buffer from the buffer
 179  * pool in which to do the name expansion, hence should be a power of two,
 180  * and must be less than or equal to MAXBSIZE.  MAXSYMLINKS defines the
 181  * maximum number of symbolic links that may be expanded in a path name.
 182  * It should be set high enough to allow all legitimate uses, but halt
 183  * infinite loops reasonably quickly.
 184  */
 185 #define MAXPATHLEN      PATH_MAX
 186 #define MAXSYMLINKS     32
 187
 188 /* Bit map related macros. */
 189 #define setbit(a,i)     ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
 190 #define clrbit(a,i)     ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
 191 #define isset(a,i)      ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
 192 #define isclr(a,i)      (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
 193
 194 /* Macros for counting and rounding. */
 195 #ifndef howmany
 196 #define howmany(x, y)   (((x)+((y)-1))/(y))
 197 #endif
 198 #define rounddown(x, y) (((x)/(y))*(y))
 199 #define roundup(x, y)   ((((x)+((y)-1))/(y))*(y))  /* to any y */
 200 #define roundup2(x, y)  (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */
 201 #define powerof2(x)     ((((x)-1)&(x))==0)
 202
 203 /* Macros for min/max. */
 204 #define MIN(a,b) (((a)<(b))?(a):(b))
 205 #define MAX(a,b) (((a)>(b))?(a):(b))
 206
 207 /*
 208  * Constants for setting the parameters of the kernel memory allocator.
 209  *
 210  * 2 ** MINBUCKET is the smallest unit of memory that will be
 211  * allocated. It must be at least large enough to hold a pointer.
 212  *
 213  * Units of memory less or equal to MAXALLOCSAVE will permanently
 214  * allocate physical memory; requests for these size pieces of
 215  * memory are quite fast. Allocations greater than MAXALLOCSAVE must
 216  * always allocate and free physical memory; requests for these
 217  * size allocations should be done infrequently as they will be slow.
 218  *
 219  * Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and
 220  * MAXALLOCSIZE must be a power of two.
 221  */
 222 #define MINBUCKET       4               /* 4 => min allocation of 16 bytes */
 223 #define MAXALLOCSAVE    (2 * PAGE_SIZE)
 224
 225 /*
 226  * Scale factor for scaled integers used to count %cpu time and load avgs.
 227  *
 228  * The number of CPU `tick's that map to a unique `%age' can be expressed
 229  * by the formula (1 / (2 ^ (FSHIFT - 11))).  The maximum load average that
 230  * can be calculated (assuming 32 bits) can be closely approximated using
 231  * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15).
 232  *
 233  * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age',
 234  * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024.
 235  */
 236 #define FSHIFT  11              /* bits to right of fixed binary point */
 237 #define FSCALE  (1<<FSHIFT)
 238
 239 #define dbtoc(db)                       /* calculates devblks to pages */ \
 240         ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT))
 241
 242 #define ctodb(db)                       /* calculates pages to devblks */ \
 243         ((db) << (PAGE_SHIFT - DEV_BSHIFT))
 244
 245
 246 /*
 247  * Make this available for most of the kernel.  There were too many
 248  * things that included sys/systm.h just for panic().
 249  */
 250 #ifdef _KERNEL
 251 void    panic (const char *, ...) __dead2 __printflike(1, 2);
 252 #endif
 253
 254 #ifndef htonl
 255 #define htonl(x)        __htonl(x)
 256 #endif
 257 #ifndef htons
 258 #define htons(x)        __htons(x)
 259 #endif
 260 #ifndef ntohl
 261 #define ntohl(x)        __ntohl(x)
 262 #endif
 263 #ifndef ntohs
 264 #define ntohs(x)        __ntohs(x)
 265 #endif
 266
 267 #endif  /* _SYS_PARAM_H_ */