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Annotation of 43BSDTahoe/sys/h/param.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)param.h     7.5 (Berkeley) 6/5/87
        !             7:  */
        !             8: 
        !             9: #define        BSD     43              /* 4.3 * 10, as cpp doesn't do floats */
        !            10: #define BSD4_3 1
        !            11: 
        !            12: /*
        !            13:  * Machine-independent constants
        !            14:  */
        !            15: #define        NMOUNT  20              /* number of mountable file systems */
        !            16: /* NMOUNT must be <= 255 unless c_mdev (cmap.h) is expanded */
        !            17: #define        MSWAPX  NMOUNT          /* pseudo mount table index for swapdev */
        !            18: #define        MAXUPRC 40              /* max processes per user */
        !            19: #define        NOFILE  64              /* max open files per process */
        !            20: #define        CANBSIZ 256             /* max size of typewriter line */
        !            21: #define        NCARGS  20480           /* # characters in exec arglist */
        !            22: #define        MAXINTERP       32      /* maximum interpreter file name length */
        !            23: #define        NGROUPS 16              /* max number groups */
        !            24: #define MAXHOSTNAMELEN 64      /* maximum hostname size */
        !            25: 
        !            26: #define        NOGROUP 65535           /* marker for empty group set member */
        !            27: 
        !            28: /*
        !            29:  * Priorities
        !            30:  */
        !            31: #define        PSWP    0
        !            32: #define        PINOD   10
        !            33: #define        PRIBIO  20
        !            34: #define        PRIUBA  24
        !            35: #define        PZERO   25
        !            36: #define        PPIPE   26
        !            37: #define        PWAIT   30
        !            38: #define        PLOCK   35
        !            39: #define        PSLEP   40
        !            40: #define        PUSER   50
        !            41: 
        !            42: #define        NZERO   0
        !            43: 
        !            44: #ifndef KERNEL
        !            45: #include       <sys/types.h>
        !            46: #else
        !            47: #ifndef LOCORE
        !            48: #include       "types.h"
        !            49: #endif
        !            50: #endif
        !            51: 
        !            52: /*
        !            53:  * Signals
        !            54:  */
        !            55: #ifdef KERNEL
        !            56: #include "signal.h"
        !            57: #else
        !            58: #include <signal.h>
        !            59: #endif
        !            60: 
        !            61: #define        ISSIG(p) \
        !            62:        ((p)->p_sig && ((p)->p_flag&STRC || \
        !            63:         ((p)->p_sig &~ ((p)->p_sigignore | (p)->p_sigmask))) && issig())
        !            64: 
        !            65: /*
        !            66:  * Machine type dependent parameters.
        !            67:  */
        !            68: #ifdef KERNEL
        !            69: #include "../machine/machparam.h"
        !            70: #else
        !            71: #include <machine/machparam.h>
        !            72: #endif
        !            73: 
        !            74: #define        NBPW    sizeof(int)     /* number of bytes in an integer */
        !            75: 
        !            76: #define        NULL    0
        !            77: #define        CMASK   022             /* default mask for file creation */
        !            78: #define        NODEV   (dev_t)(-1)
        !            79: 
        !            80: /*
        !            81:  * Clustering of hardware pages on machines with ridiculously small
        !            82:  * page sizes is done here.  The paging subsystem deals with units of
        !            83:  * CLSIZE pte's describing NBPG (from machine/machparam.h) pages each.
        !            84:  *
        !            85:  * NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE
        !            86:  */
        !            87: #define        CLBYTES         (CLSIZE*NBPG)
        !            88: #define        CLOFSET         (CLSIZE*NBPG-1) /* for clusters, like PGOFSET */
        !            89: #define        claligned(x)    ((((int)(x))&CLOFSET)==0)
        !            90: #define        CLOFF           CLOFSET
        !            91: #define        CLSHIFT         (PGSHIFT+CLSIZELOG2)
        !            92: 
        !            93: #if CLSIZE==1
        !            94: #define        clbase(i)       (i)
        !            95: #define        clrnd(i)        (i)
        !            96: #else
        !            97: /* give the base virtual address (first of CLSIZE) */
        !            98: #define        clbase(i)       ((i) &~ (CLSIZE-1))
        !            99: /* round a number of clicks up to a whole cluster */
        !           100: #define        clrnd(i)        (((i) + (CLSIZE-1)) &~ (CLSIZE-1))
        !           101: #endif
        !           102: 
        !           103: /* CBLOCK is the size of a clist block, must be power of 2 */
        !           104: #define        CBLOCK  64
        !           105: #define        CBSIZE  (CBLOCK - sizeof(struct cblock *))      /* data chars/clist */
        !           106: #define        CROUND  (CBLOCK - 1)                            /* clist rounding */
        !           107: 
        !           108: /*
        !           109:  * File system parameters and macros.
        !           110:  *
        !           111:  * The file system is made out of blocks of at most MAXBSIZE units,
        !           112:  * with smaller units (fragments) only in the last direct block.
        !           113:  * MAXBSIZE primarily determines the size of buffers in the buffer
        !           114:  * pool. It may be made larger without any effect on existing
        !           115:  * file systems; however making it smaller make make some file
        !           116:  * systems unmountable.
        !           117:  *
        !           118:  * Note that the blocked devices are assumed to have DEV_BSIZE
        !           119:  * "sectors" and that fragments must be some multiple of this size.
        !           120:  * Block devices are read in BLKDEV_IOSIZE units. This number must
        !           121:  * be a power of two and in the range of
        !           122:  *     DEV_BSIZE <= BLKDEV_IOSIZE <= MAXBSIZE
        !           123:  * This size has no effect upon the file system, but is usually set
        !           124:  * to the block size of the root file system, so as to maximize the
        !           125:  * speed of ``fsck''.
        !           126:  */
        !           127: #define        MAXBSIZE        8192
        !           128: #define MAXFRAG        8
        !           129: 
        !           130: /*
        !           131:  * MAXPATHLEN defines the longest permissable path length
        !           132:  * after expanding symbolic links. It is used to allocate
        !           133:  * a temporary buffer from the buffer pool in which to do the
        !           134:  * name expansion, hence should be a power of two, and must
        !           135:  * be less than or equal to MAXBSIZE.
        !           136:  * MAXSYMLINKS defines the maximum number of symbolic links
        !           137:  * that may be expanded in a path name. It should be set high
        !           138:  * enough to allow all legitimate uses, but halt infinite loops
        !           139:  * reasonably quickly.
        !           140:  */
        !           141: #define MAXPATHLEN     1024
        !           142: #define MAXSYMLINKS    8
        !           143: 
        !           144: /*
        !           145:  * Constants for setting the parameters of the kernel memory allocator.
        !           146:  *
        !           147:  * 2 ** MINBUCKET is the smallest unit of memory that will be
        !           148:  * allocated. It must be at least large enough to hold a pointer.
        !           149:  *
        !           150:  * Units of memory less or equal to MAXALLOCSAVE will permanently
        !           151:  * allocate physical memory; requests for these size pieces of
        !           152:  * memory are quite fast. Allocations greater than MAXALLOCSAVE must
        !           153:  * always allocate and free physical memory; requests for these
        !           154:  * size allocations should be done infrequently as they will be slow.
        !           155:  * Constraints: CLBYTES <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14)
        !           156:  * and MAXALLOCSIZE must be a power of two.
        !           157:  */
        !           158: #define MINBUCKET      4               /* 4 => min allocation of 16 bytes */
        !           159: #define MAXALLOCSAVE   (2 * CLBYTES)
        !           160: 
        !           161: /*
        !           162:  * bit map related macros
        !           163:  */
        !           164: #define        setbit(a,i)     ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
        !           165: #define        clrbit(a,i)     ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
        !           166: #define        isset(a,i)      ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
        !           167: #define        isclr(a,i)      (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
        !           168: 
        !           169: /*
        !           170:  * Macros for fast min/max.
        !           171:  */
        !           172: #define        MIN(a,b) (((a)<(b))?(a):(b))
        !           173: #define        MAX(a,b) (((a)>(b))?(a):(b))
        !           174: 
        !           175: /*
        !           176:  * Macros for counting and rounding.
        !           177:  */
        !           178: #ifndef howmany
        !           179: #define        howmany(x, y)   (((x)+((y)-1))/(y))
        !           180: #endif
        !           181: #define        roundup(x, y)   ((((x)+((y)-1))/(y))*(y))
        !           182: #define powerof2(x)    ((((x)-1)&(x))==0)

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