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 1.50.2.1 2008/07/14 04:20:35 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.  The number doesn't really meaningfully
  52  * translate to a version number.
  53  *
  54  * 170000 - base development version after 1.6 branch
  55  * 170001 - base development version before 1.8 branch
  56  * 190000 - base development version after 1.8 branch
  57  * 195000 - base development version after 1.10 branch
  58  * 197500 - base development version before 1.12 branch
  59  * 197600 - 1.12 branch
  60  * 197700 - base development version after 1.12 branch
  61  * 199900 - base development version before 2.0 branch
  62  * 200000 - 2.0 branch
  63  */
  64 #undef __DragonFly_version
  65 #define __DragonFly_version 200000      /* Master, propagated to newvers */
  66
  67 #ifdef __FreeBSD__
  68 /*
  69  * __FreeBSD_version numbers for source compatibility.  This is temporary
  70  * along with the __FreeBSD__ define in gcc2.  Note that gcc3 does not
  71  * define __FreeBSD__ by default, only __DragonFly__.
  72  */
  73 #undef __FreeBSD_version
  74 #define __FreeBSD_version 480101
  75 #endif
  76
  77 #include <sys/_null.h>
  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/select.h>
 115 #include <sys/signal.h>
 116 #endif
 117
 118 /* Machine type dependent parameters. */
 119 #include <machine/param.h>
 120 #ifndef _KERNEL
 121 #include <machine/limits.h>
 122 #endif
 123
 124 #define PCATCH          0x00000100      /* tsleep checks signals */
 125 #define PUSRFLAG1       0x00000200      /* Subsystem specific flag */
 126 #define PNORESCHED      0x00000400      /* No reschedule on wakeup */
 127 #define PWAKEUP_CPUMASK 0x00003FFF      /* start cpu for chained wakeups */
 128 #define PWAKEUP_MYCPU   0x00004000      /* wakeup on current cpu only */
 129 #define PWAKEUP_ONE     0x00008000      /* argument to wakeup: only one */
 130 #define PDOMAIN_MASK    0xFFFF0000      /* address domains for wakeup */
 131 #define PDOMAIN_UMTX    0x00010000      /* independant domain for UMTX */
 132 #define PWAKEUP_ENCODE(domain, cpu)     ((domain) | (cpu))
 133 #define PWAKEUP_DECODE(domain)          ((domain) & PWAKEUP_CPUMASK)
 134
 135 #define NZERO   0               /* default "nice" */
 136
 137 #define NBPW    sizeof(int)     /* number of bytes per word (integer) */
 138
 139 #define CMASK   022             /* default file mask: S_IWGRP|S_IWOTH */
 140 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
 141 #define NOUDEV  (udev_t)(-1)    /* non-existent device */
 142 #define NOMAJ   256             /* non-existent device */
 143 #endif
 144
 145 #ifndef _KERNEL
 146 #define NODEV   (dev_t)(-1)     /* non-existent device */
 147 #endif
 148
 149 /*
 150  * File system parameters and macros.
 151  *
 152  * MAXBSIZE -   Filesystems are made out of blocks of at most MAXBSIZE bytes
 153  *              per block.  MAXBSIZE may be made larger without effecting
 154  *              any existing filesystems as long as it does not exceed MAXPHYS,
 155  *              and may be made smaller at the risk of not being able to use
 156  *              filesystems which require a block size exceeding MAXBSIZE.
 157  *
 158  * BKVASIZE -   Nominal buffer space per buffer, in bytes.  BKVASIZE is the
 159  *              minimum KVM memory reservation the kernel is willing to make.
 160  *              Filesystems can of course request smaller chunks.  Actual
 161  *              backing memory uses a chunk size of a page (PAGE_SIZE).
 162  *
 163  *              If you make BKVASIZE too small you risk seriously fragmenting
 164  *              the buffer KVM map which may slow things down a bit.  If you
 165  *              make it too big the kernel will not be able to optimally use
 166  *              the KVM memory reserved for the buffer cache and will wind
 167  *              up with too-few buffers.
 168  *
 169  *              The default is 16384, roughly 2x the block size used by a
 170  *              normal UFS filesystem.
 171  */
 172 #define MAXBSIZE        65536   /* must be power of 2 */
 173 #define BKVASIZE        16384   /* must be power of 2 */
 174 #define BKVAMASK        (BKVASIZE-1)
 175 #define MAXFRAG         8
 176
 177 /*
 178  * MAXPATHLEN defines the longest permissible path length after expanding
 179  * symbolic links. It is used to allocate a temporary buffer from the buffer
 180  * pool in which to do the name expansion, hence should be a power of two,
 181  * and must be less than or equal to MAXBSIZE.  MAXSYMLINKS defines the
 182  * maximum number of symbolic links that may be expanded in a path name.
 183  * It should be set high enough to allow all legitimate uses, but halt
 184  * infinite loops reasonably quickly.
 185  */
 186 #define MAXPATHLEN      PATH_MAX
 187 #define MAXSYMLINKS     32
 188
 189 /* Bit map related macros. */
 190 #define setbit(a,i)     ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
 191 #define clrbit(a,i)     ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
 192 #define isset(a,i)      ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
 193 #define isclr(a,i)      (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
 194
 195 /* Macros for counting and rounding. */
 196 #ifndef howmany
 197 #define howmany(x, y)   (((x)+((y)-1))/(y))
 198 #endif
 199 #define rounddown(x, y) (((x)/(y))*(y))
 200 #define roundup(x, y)   ((((x)+((y)-1))/(y))*(y))  /* to any y */
 201 #define roundup2(x, y)  (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */
 202 #define powerof2(x)     ((((x)-1)&(x))==0)
 203
 204 /* Macros for min/max. */
 205 #define MIN(a,b) (((a)<(b))?(a):(b))
 206 #define MAX(a,b) (((a)>(b))?(a):(b))
 207
 208 /*
 209  * Constants for setting the parameters of the kernel memory allocator.
 210  *
 211  * 2 ** MINBUCKET is the smallest unit of memory that will be
 212  * allocated. It must be at least large enough to hold a pointer.
 213  *
 214  * Units of memory less or equal to MAXALLOCSAVE will permanently
 215  * allocate physical memory; requests for these size pieces of
 216  * memory are quite fast. Allocations greater than MAXALLOCSAVE must
 217  * always allocate and free physical memory; requests for these
 218  * size allocations should be done infrequently as they will be slow.
 219  *
 220  * Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and
 221  * MAXALLOCSIZE must be a power of two.
 222  */
 223 #define MINBUCKET       4               /* 4 => min allocation of 16 bytes */
 224 #define MAXALLOCSAVE    (2 * PAGE_SIZE)
 225
 226 /*
 227  * Scale factor for scaled integers used to count %cpu time and load avgs.
 228  *
 229  * The number of CPU `tick's that map to a unique `%age' can be expressed
 230  * by the formula (1 / (2 ^ (FSHIFT - 11))).  The maximum load average that
 231  * can be calculated (assuming 32 bits) can be closely approximated using
 232  * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15).
 233  *
 234  * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age',
 235  * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024.
 236  */
 237 #define FSHIFT  11              /* bits to right of fixed binary point */
 238 #define FSCALE  (1<<FSHIFT)
 239
 240 #define dbtoc(db)                       /* calculates devblks to pages */ \
 241         ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT))
 242
 243 #define ctodb(db)                       /* calculates pages to devblks */ \
 244         ((db) << (PAGE_SHIFT - DEV_BSHIFT))
 245
 246
 247 /*
 248  * Make this available for most of the kernel.  There were too many
 249  * things that included sys/systm.h just for panic().
 250  */
 251 #ifdef _KERNEL
 252 void    panic (const char *, ...) __dead2 __printflike(1, 2);
 253 #endif
 254
 255 #ifndef htonl
 256 #define htonl(x)        __htonl(x)
 257 #endif
 258 #ifndef htons
 259 #define htons(x)        __htons(x)
 260 #endif
 261 #ifndef ntohl
 262 #define ntohl(x)        __ntohl(x)
 263 #endif
 264 #ifndef ntohs
 265 #define ntohs(x)        __ntohs(x)
 266 #endif
 267
 268 #endif  /* _SYS_PARAM_H_ */