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 1.53 2008/11/11 00:55:49 pavalos 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  * 200100 - base development version after 2.0 branch
  64  * 200101 - lchflags syscall
  65  * 200200 - 2.2 branch
  66  * 200201 - base development version after 2.2 branch
  67  */
  68 #undef __DragonFly_version
  69 #define __DragonFly_version 200201      /* Master, propagated to newvers */
  70
  71 #ifdef __FreeBSD__
  72 /*
  73  * __FreeBSD_version numbers for source compatibility.  This is temporary
  74  * along with the __FreeBSD__ define in gcc2.  Note that gcc3 does not
  75  * define __FreeBSD__ by default, only __DragonFly__.
  76  */
  77 #undef __FreeBSD_version
  78 #define __FreeBSD_version 480101
  79 #endif
  80
  81 #include <sys/_null.h>
  82
  83 #ifndef LOCORE
  84 #include <sys/types.h>
  85 #endif
  86
  87 /*
  88  * Machine-independent constants (some used in following include files).
  89  * Redefined constants are from POSIX 1003.1 limits file.
  90  *
  91  * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>)
  92  * MAXLOGNAME should be == UT_NAMESIZE+1 (see <utmp.h>)
  93  */
  94 #include <sys/syslimits.h>
  95
  96 #define MAXCOMLEN       16              /* max command name remembered */
  97 #define MAXINTERP       32              /* max interpreter file name length */
  98 #define MAXLOGNAME      17              /* max login name length (incl. NUL) */
  99 #define MAXUPRC         CHILD_MAX       /* max simultaneous processes */
 100 #define NCARGS          ARG_MAX         /* max bytes for an exec function */
 101 #define NGROUPS         NGROUPS_MAX     /* max number groups */
 102 #define NOFILE          OPEN_MAX        /* max open files per process */
 103 #define NOGROUP         65535           /* marker for empty group set member */
 104 #define MAXHOSTNAMELEN  256             /* max hostname size */
 105
 106 /* More types and definitions used throughout the kernel. */
 107 #ifdef _KERNEL
 108 #include <sys/cdefs.h>
 109 #include <sys/errno.h>
 110 #include <sys/time.h>
 111
 112 #define FALSE   0
 113 #define TRUE    1
 114 #endif
 115
 116 #ifndef _KERNEL
 117 /* Signals. */
 118 #include <sys/select.h>
 119 #include <sys/signal.h>
 120 #endif
 121
 122 /* Machine type dependent parameters. */
 123 #include <machine/param.h>
 124 #ifndef _KERNEL
 125 #include <machine/limits.h>
 126 #endif
 127
 128 #define PCATCH          0x00000100      /* tsleep checks signals */
 129 #define PUSRFLAG1       0x00000200      /* Subsystem specific flag */
 130 #define PWAKEUP_CPUMASK 0x00003FFF      /* start cpu for chained wakeups */
 131 #define PWAKEUP_MYCPU   0x00004000      /* wakeup on current cpu only */
 132 #define PWAKEUP_ONE     0x00008000      /* argument to wakeup: only one */
 133 #define PDOMAIN_MASK    0xFFFF0000      /* address domains for wakeup */
 134 #define PDOMAIN_UMTX    0x00010000      /* independant domain for UMTX */
 135 #define PWAKEUP_ENCODE(domain, cpu)     ((domain) | (cpu))
 136 #define PWAKEUP_DECODE(domain)          ((domain) & PWAKEUP_CPUMASK)
 137
 138 #define NZERO   0               /* default "nice" */
 139
 140 #define NBPW    sizeof(int)     /* number of bytes per word (integer) */
 141
 142 #define CMASK   022             /* default file mask: S_IWGRP|S_IWOTH */
 143 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
 144 #define NOUDEV  (udev_t)(-1)    /* non-existent device */
 145 #define NOMAJ   256             /* non-existent device */
 146 #endif
 147
 148 #ifndef _KERNEL
 149 #define NODEV   (dev_t)(-1)     /* non-existent device */
 150 #endif
 151
 152 /*
 153  * File system parameters and macros.
 154  *
 155  * MAXBSIZE -   Filesystems are made out of blocks of at most MAXBSIZE bytes
 156  *              per block.  MAXBSIZE may be made larger without effecting
 157  *              any existing filesystems as long as it does not exceed MAXPHYS,
 158  *              and may be made smaller at the risk of not being able to use
 159  *              filesystems which require a block size exceeding MAXBSIZE.
 160  *
 161  * BKVASIZE -   Nominal buffer space per buffer, in bytes.  BKVASIZE is the
 162  *              minimum KVM memory reservation the kernel is willing to make.
 163  *              Filesystems can of course request smaller chunks.  Actual
 164  *              backing memory uses a chunk size of a page (PAGE_SIZE).
 165  *
 166  *              If you make BKVASIZE too small you risk seriously fragmenting
 167  *              the buffer KVM map which may slow things down a bit.  If you
 168  *              make it too big the kernel will not be able to optimally use
 169  *              the KVM memory reserved for the buffer cache and will wind
 170  *              up with too-few buffers.
 171  *
 172  *              The default is 16384, roughly 2x the block size used by a
 173  *              normal UFS filesystem.
 174  */
 175 #define MAXBSIZE        65536   /* must be power of 2 */
 176 #define BKVASIZE        16384   /* must be power of 2 */
 177 #define BKVAMASK        (BKVASIZE-1)
 178 #define MAXFRAG         8
 179
 180 /*
 181  * MAXPATHLEN defines the longest permissible path length after expanding
 182  * symbolic links. It is used to allocate a temporary buffer from the buffer
 183  * pool in which to do the name expansion, hence should be a power of two,
 184  * and must be less than or equal to MAXBSIZE.  MAXSYMLINKS defines the
 185  * maximum number of symbolic links that may be expanded in a path name.
 186  * It should be set high enough to allow all legitimate uses, but halt
 187  * infinite loops reasonably quickly.
 188  */
 189 #define MAXPATHLEN      PATH_MAX
 190 #define MAXSYMLINKS     32
 191
 192 /* Bit map related macros. */
 193 #define setbit(a,i)     ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
 194 #define clrbit(a,i)     ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
 195 #define isset(a,i)      ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
 196 #define isclr(a,i)      (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
 197
 198 /* Macros for counting and rounding. */
 199 #ifndef howmany
 200 #define howmany(x, y)   (((x)+((y)-1))/(y))
 201 #endif
 202 #define rounddown(x, y) (((x)/(y))*(y))
 203 #define roundup(x, y)   ((((x)+((y)-1))/(y))*(y))  /* to any y */
 204 #define roundup2(x, y)  (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */
 205 #define powerof2(x)     ((((x)-1)&(x))==0)
 206
 207 /* Macros for min/max. */
 208 #define MIN(a,b) (((a)<(b))?(a):(b))
 209 #define MAX(a,b) (((a)>(b))?(a):(b))
 210
 211 /*
 212  * Constants for setting the parameters of the kernel memory allocator.
 213  *
 214  * 2 ** MINBUCKET is the smallest unit of memory that will be
 215  * allocated. It must be at least large enough to hold a pointer.
 216  *
 217  * Units of memory less or equal to MAXALLOCSAVE will permanently
 218  * allocate physical memory; requests for these size pieces of
 219  * memory are quite fast. Allocations greater than MAXALLOCSAVE must
 220  * always allocate and free physical memory; requests for these
 221  * size allocations should be done infrequently as they will be slow.
 222  *
 223  * Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and
 224  * MAXALLOCSIZE must be a power of two.
 225  */
 226 #define MINBUCKET       4               /* 4 => min allocation of 16 bytes */
 227 #define MAXALLOCSAVE    (2 * PAGE_SIZE)
 228
 229 /*
 230  * Scale factor for scaled integers used to count %cpu time and load avgs.
 231  *
 232  * The number of CPU `tick's that map to a unique `%age' can be expressed
 233  * by the formula (1 / (2 ^ (FSHIFT - 11))).  The maximum load average that
 234  * can be calculated (assuming 32 bits) can be closely approximated using
 235  * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15).
 236  *
 237  * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age',
 238  * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024.
 239  */
 240 #define FSHIFT  11              /* bits to right of fixed binary point */
 241 #define FSCALE  (1<<FSHIFT)
 242
 243 #define dbtoc(db)                       /* calculates devblks to pages */ \
 244         ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT))
 245
 246 #define ctodb(db)                       /* calculates pages to devblks */ \
 247         ((db) << (PAGE_SHIFT - DEV_BSHIFT))
 248
 249
 250 /*
 251  * Make this available for most of the kernel.  There were too many
 252  * things that included sys/systm.h just for panic().
 253  */
 254 #ifdef _KERNEL
 255 void    panic (const char *, ...) __dead2 __printflike(1, 2);
 256 #endif
 257
 258 #ifndef htonl
 259 #define htonl(x)        __htonl(x)
 260 #endif
 261 #ifndef htons
 262 #define htons(x)        __htons(x)
 263 #endif
 264 #ifndef ntohl
 265 #define ntohl(x)        __ntohl(x)
 266 #endif
 267 #ifndef ntohs
 268 #define ntohs(x)        __ntohs(x)
 269 #endif
 270
 271 #endif  /* _SYS_PARAM_H_ */