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Annotation of kernel/bsd/sys/param.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /* Copyright (c) 1995, 1997 Apple Computer, Inc. All Rights Reserved */
        !            26: /*-
        !            27:  * Copyright (c) 1982, 1986, 1989, 1993
        !            28:  *     The Regents of the University of California.  All rights reserved.
        !            29:  * (c) UNIX System Laboratories, Inc.
        !            30:  * All or some portions of this file are derived from material licensed
        !            31:  * to the University of California by American Telephone and Telegraph
        !            32:  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
        !            33:  * the permission of UNIX System Laboratories, Inc.
        !            34:  *
        !            35:  * Redistribution and use in source and binary forms, with or without
        !            36:  * modification, are permitted provided that the following conditions
        !            37:  * are met:
        !            38:  * 1. Redistributions of source code must retain the above copyright
        !            39:  *    notice, this list of conditions and the following disclaimer.
        !            40:  * 2. Redistributions in binary form must reproduce the above copyright
        !            41:  *    notice, this list of conditions and the following disclaimer in the
        !            42:  *    documentation and/or other materials provided with the distribution.
        !            43:  * 3. All advertising materials mentioning features or use of this software
        !            44:  *    must display the following acknowledgement:
        !            45:  *     This product includes software developed by the University of
        !            46:  *     California, Berkeley and its contributors.
        !            47:  * 4. Neither the name of the University nor the names of its contributors
        !            48:  *    may be used to endorse or promote products derived from this software
        !            49:  *    without specific prior written permission.
        !            50:  *
        !            51:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            52:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            53:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            54:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            55:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            56:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            57:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            58:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            59:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            60:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            61:  * SUCH DAMAGE.
        !            62:  *
        !            63:  *     @(#)param.h     8.3 (Berkeley) 4/4/95
        !            64:  */
        !            65: 
        !            66: #ifndef        _SYS_PARAM_H_
        !            67: #define _SYS_PARAM_H_
        !            68: 
        !            69: #define        BSD     199506          /* System version (year & month). */
        !            70: #define BSD4_3 1
        !            71: #define BSD4_4 1
        !            72: 
        !            73: #define NeXTBSD        1995064         /* NeXTBSD version (year, month, release) */
        !            74: #define NeXTBSD4_0 0           /* NeXTBSD 4.0 */
        !            75: 
        !            76: #ifndef NULL
        !            77: #define        NULL    0
        !            78: #endif
        !            79: 
        !            80: #ifndef LOCORE
        !            81: #include <sys/types.h>
        !            82: #endif
        !            83: 
        !            84: /*
        !            85:  * Machine-independent constants (some used in following include files).
        !            86:  * Redefined constants are from POSIX 1003.1 limits file.
        !            87:  *
        !            88:  * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>)
        !            89:  * MAXLOGNAME should be >= UT_NAMESIZE (see <utmp.h>)
        !            90:  */
        !            91: #include <sys/syslimits.h>
        !            92: 
        !            93: #define        MAXCOMLEN       16              /* max command name remembered */
        !            94: #define        MAXINTERP       64              /* max interpreter file name length */
        !            95: #define        MAXLOGNAME      12              /* max login name length */
        !            96: #define        MAXUPRC         CHILD_MAX       /* max simultaneous processes */
        !            97: #define        NCARGS          ARG_MAX         /* max bytes for an exec function */
        !            98: #define        NGROUPS         NGROUPS_MAX     /* max number groups */
        !            99: #define        NOFILE          256             /* default max open files per process */
        !           100: #define        NOGROUP         65535           /* marker for empty group set member */
        !           101: #define MAXHOSTNAMELEN 256             /* max hostname size */
        !           102: #define MAXDOMNAMELEN  256             /* maximum domain name length */
        !           103: 
        !           104: /* Machine type dependent parameters. */
        !           105: #include <machine/param.h>
        !           106: #include <machine/limits.h>
        !           107: 
        !           108: /* More types and definitions used throughout the kernel. */
        !           109: #ifdef _KERNEL
        !           110: #include <sys/cdefs.h>
        !           111: #include <sys/errno.h>
        !           112: #include <sys/time.h>
        !           113: #include <sys/resource.h>
        !           114: #include <sys/ucred.h>
        !           115: #include <sys/uio.h>
        !           116: #endif
        !           117: 
        !           118: /* Signals. */
        !           119: #include <sys/signal.h>
        !           120: 
        !           121: /*
        !           122:  * Priorities.  Note that with 32 run queues, differences less than 4 are
        !           123:  * insignificant.
        !           124:  */
        !           125: #define        PSWP    0
        !           126: #define        PVM     4
        !           127: #define        PINOD   8
        !           128: #define        PRIBIO  16
        !           129: #define        PVFS    20
        !           130: #define        PZERO   22              /* No longer magic, shouldn't be here.  XXX */
        !           131: #define        PSOCK   24
        !           132: #define        PWAIT   32
        !           133: #define        PLOCK   36
        !           134: #define        PPAUSE  40
        !           135: #define        PUSER   50
        !           136: #define        MAXPRI  127             /* Priorities range from 0 through MAXPRI. */
        !           137: 
        !           138: #define        PRIMASK 0x0ff
        !           139: #define        PCATCH  0x100           /* OR'd with pri for tsleep to check signals */
        !           140: 
        !           141: #define        NZERO   0               /* default "nice" */
        !           142: 
        !           143: #define        NBPW    sizeof(int)     /* number of bytes per word (integer) */
        !           144: 
        !           145: #define        CMASK   022             /* default file mask: S_IWGRP|S_IWOTH */
        !           146: #define        NODEV   (dev_t)(-1)     /* non-existent device */
        !           147: 
        !           148: /*
        !           149:  * Clustering of hardware pages on machines with ridiculously small
        !           150:  * page sizes is done here.  The paging subsystem deals with units of
        !           151:  * CLSIZE pte's describing NBPG (from machine/param.h) pages each.
        !           152:  */
        !           153: #define        CLBYTES         (CLSIZE*NBPG)
        !           154: #define        CLOFSET         (CLSIZE*NBPG-1) /* for clusters, like PGOFSET */
        !           155: #define        claligned(x)    ((((int)(x))&CLOFSET)==0)
        !           156: #define        CLOFF           CLOFSET
        !           157: #define        CLSHIFT         (PGSHIFT+CLSIZELOG2)
        !           158: 
        !           159: #if CLSIZE==1
        !           160: #define        clbase(i)       (i)
        !           161: #define        clrnd(i)        (i)
        !           162: #else
        !           163: /* Give the base virtual address (first of CLSIZE). */
        !           164: #define        clbase(i)       ((i) &~ (CLSIZE-1))
        !           165: /* Round a number of clicks up to a whole cluster. */
        !           166: #define        clrnd(i)        (((i) + (CLSIZE-1)) &~ (CLSIZE-1))
        !           167: #endif
        !           168: 
        !           169: #define        CBLOCK  64              /* Clist block size, must be a power of 2. */
        !           170: #define CBQSIZE        (CBLOCK/NBBY)   /* Quote bytes/cblock - can do better. */
        !           171:                                /* Data chars/clist. */
        !           172: #define        CBSIZE  (CBLOCK - sizeof(struct cblock *) - CBQSIZE)
        !           173: #define        CROUND  (CBLOCK - 1)    /* Clist rounding. */
        !           174: 
        !           175: /*
        !           176:  * File system parameters and macros.
        !           177:  *
        !           178:  * The file system is made out of blocks of at most MAXBSIZE units, with
        !           179:  * smaller units (fragments) only in the last direct block.  MAXBSIZE
        !           180:  * primarily determines the size of buffers in the buffer pool.  It may be
        !           181:  * made larger without any effect on existing file systems; however making
        !           182:  * it smaller make make some file systems unmountable.
        !           183:  */
        !           184: #define        MAXBSIZE        8192
        !           185: #define MAXPHYSIO      MAXPHYS
        !           186: #define MAXFRAG        8
        !           187: 
        !           188: /*
        !           189:  * MAXPATHLEN defines the longest permissable path length after expanding
        !           190:  * symbolic links. It is used to allocate a temporary buffer from the buffer
        !           191:  * pool in which to do the name expansion, hence should be a power of two,
        !           192:  * and must be less than or equal to MAXBSIZE.  MAXSYMLINKS defines the
        !           193:  * maximum number of symbolic links that may be expanded in a path name.
        !           194:  * It should be set high enough to allow all legitimate uses, but halt
        !           195:  * infinite loops reasonably quickly.
        !           196:  */
        !           197: #define        MAXPATHLEN      PATH_MAX
        !           198: #define MAXSYMLINKS    32
        !           199: 
        !           200: /* Bit map related macros. */
        !           201: #define        setbit(a,i)     (((char *)(a))[(i)/NBBY] |= 1<<((i)%NBBY))
        !           202: #define        clrbit(a,i)     (((char *)(a))[(i)/NBBY] &= ~(1<<((i)%NBBY)))
        !           203: #define        isset(a,i)      (((char *)(a))[(i)/NBBY] & (1<<((i)%NBBY)))
        !           204: #define        isclr(a,i)      ((((char *)(a))[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
        !           205: 
        !           206: /* Macros for counting and rounding. */
        !           207: #ifndef howmany
        !           208: #define        howmany(x, y)   (((x)+((y)-1))/(y))
        !           209: #endif
        !           210: #define        roundup(x, y)   ((((x)+((y)-1))/(y))*(y))
        !           211: #define powerof2(x)    ((((x)-1)&(x))==0)
        !           212: 
        !           213: /* Macros for min/max. */
        !           214: #ifndef MIN
        !           215: #define        MIN(a,b) (((a)<(b))?(a):(b))
        !           216: #endif /* MIN */
        !           217: #ifndef MAX
        !           218: #define        MAX(a,b) (((a)>(b))?(a):(b))
        !           219: #endif /* MAX */
        !           220: 
        !           221: /*
        !           222:  * Constants for setting the parameters of the kernel memory allocator.
        !           223:  *
        !           224:  * 2 ** MINBUCKET is the smallest unit of memory that will be
        !           225:  * allocated. It must be at least large enough to hold a pointer.
        !           226:  *
        !           227:  * Units of memory less or equal to MAXALLOCSAVE will permanently
        !           228:  * allocate physical memory; requests for these size pieces of
        !           229:  * memory are quite fast. Allocations greater than MAXALLOCSAVE must
        !           230:  * always allocate and free physical memory; requests for these
        !           231:  * size allocations should be done infrequently as they will be slow.
        !           232:  *
        !           233:  * Constraints: CLBYTES <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and
        !           234:  * MAXALLOCSIZE must be a power of two.
        !           235:  */
        !           236: #define MINBUCKET      4               /* 4 => min allocation of 16 bytes */
        !           237: #define MAXALLOCSAVE   (2 * CLBYTES)
        !           238: 
        !           239: /*
        !           240:  * Scale factor for scaled integers used to count %cpu time and load avgs.
        !           241:  *
        !           242:  * The number of CPU `tick's that map to a unique `%age' can be expressed
        !           243:  * by the formula (1 / (2 ^ (FSHIFT - 11))).  The maximum load average that
        !           244:  * can be calculated (assuming 32 bits) can be closely approximated using
        !           245:  * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15).
        !           246:  *
        !           247:  * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age',
        !           248:  * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024.
        !           249:  */
        !           250: #define        FSHIFT  11              /* bits to right of fixed binary point */
        !           251: #define FSCALE (1<<FSHIFT)
        !           252: 
        !           253: #endif /* _SYS_PARAM_H_ */

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