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Annotation of cci/sys/h/param.h, revision 1.1

1.1     ! root        1: /*     param.h 6.1     83/07/29        */
        !             2: 
        !             3: /*
        !             4:  * Machine type dependent parameters.
        !             5:  */
        !             6: #ifdef KERNEL
        !             7: #include "../machine/param.h"
        !             8: #else
        !             9: #include <machine/param.h>
        !            10: #endif
        !            11: 
        !            12: #define        NPTEPG          (NBPG/(sizeof (struct pte)))
        !            13: 
        !            14: /*
        !            15:  * Machine-independent constants
        !            16:  */
        !            17: /*
        !            18:  * Next 2 constants HAVE to be equal. AND they HAVE to be contained
        !            19:  * in the c_mdev field of 'cmap' structure. Don't increase at whim.
        !            20:  * Computed from (4 controllers) * (4 drives/controller)
        !            21:  *                     * (4 file-systems/drive) - 1
        !            22:  */
        !            23: #define        NMOUNT  63              /* number of mountable file systems */
        !            24: #define        MSWAPX  63              /* pseudo mount table index for swapdev */
        !            25: 
        !            26: #ifdef NETGENERR
        !            27: #define        MAXUPRC 75              /* max processes per user, was 25 */
        !            28: #else
        !            29: #define        MAXUPRC 25              /* max processes per user, was 25 */
        !            30: #endif NETGENERR
        !            31: #define        NOFILE  20              /* max open files per process */
        !            32: /* NOFILE MUST NOT BE >= 31; SEE pte.h */
        !            33: #define        CANBSIZ 256             /* max size of typewriter line */
        !            34: #define        NCARGS  10240           /* # characters in exec arglist */
        !            35: #define        NGROUPS 8               /* max number groups */
        !            36: 
        !            37: #define        NOGROUP -1              /* marker for empty group set member */
        !            38: 
        !            39: /*
        !            40:  * Priorities
        !            41:  */
        !            42: #define        PMASK   0x007f
        !            43: #define PCATCH 0x0100
        !            44: #define        PSWP    0
        !            45: #define        PINOD   10
        !            46: #define        PRIBIO  20
        !            47: #define        PRIUBA  24
        !            48: #define        PZERO   25
        !            49: #define        PPIPE   26
        !            50: #define        PWAIT   30
        !            51: #define        PLOCK   35
        !            52: #define        PSLEP   40
        !            53: #define        PUSER   50
        !            54: 
        !            55: #define        NZERO   20
        !            56: 
        !            57: /*
        !            58:  * Signals
        !            59:  */
        !            60: #ifdef KERNEL
        !            61: #include "../h/signal.h"
        !            62: #else
        !            63: #include <signal.h>
        !            64: #endif
        !            65: 
        !            66: #define        ISSIG(p) \
        !            67:        ((p)->p_sig && ((p)->p_flag&STRC || \
        !            68:         ((p)->p_sig &~ ((p)->p_sigignore | (p)->p_sigmask))) && issig())
        !            69: 
        !            70: /*
        !            71:  * Fundamental constants of the implementation.
        !            72:  */
        !            73: #define        NBBY    8               /* number of bits in a byte */
        !            74: #define        NBPW    sizeof(int)     /* number of bytes in an integer */
        !            75: 
        !            76: #define        NULL    0
        !            77: #define        CMASK   0               /* default mask for file creation */
        !            78: #define        NODEV   (dev_t)(-1)
        !            79: 
        !            80: /*
        !            81:  * Sys5 ULIMIT and USTAT defines 
        !            82:  */
        !            83: #define CDLIMIT        (1L<<11)        /* default max. write address for NBPG = 512 */
        !            84: #define MAXMEM 0x7fffffff      /* max. data segment size in bytes */
        !            85: #define        brdev(x)        (x&0x1fff)
        !            86: 
        !            87: /*
        !            88:  * Clustering of hardware pages on machines with ridiculously small
        !            89:  * page sizes is done here.  The paging subsystem deals with units of
        !            90:  * CLSIZE pte's describing NBPG (from vm.h) pages each... BSIZE must
        !            91:  * be CLSIZE*NBPG in the current implementation, that is the paging subsystem
        !            92:  * deals with the same size blocks that the file system uses.
        !            93:  *
        !            94:  * NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE
        !            95:  */
        !            96: #define        CLBYTES         (CLSIZE*NBPG)
        !            97: #define        CLOFSET         (CLSIZE*NBPG-1) /* for clusters, like PGOFSET */
        !            98: #define        claligned(x)    ((((int)(x))&CLOFSET)==0)
        !            99: #define        CLOFF           CLOFSET
        !           100: #define        CLSHIFT         (PGSHIFT+CLSIZELOG2)
        !           101: 
        !           102: #if CLSIZE==1
        !           103: #define        clbase(i)       (i)
        !           104: #define        clrnd(i)        (i)
        !           105: #else
        !           106: /* give the base virtual address (first of CLSIZE) */
        !           107: #define        clbase(i)       ((i) &~ (CLSIZE-1))
        !           108: /* round a number of clicks up to a whole cluster */
        !           109: #define        clrnd(i)        (((i) + (CLSIZE-1)) &~ (CLSIZE-1))
        !           110: #endif
        !           111: 
        !           112: #ifndef INTRLVE
        !           113: /* macros replacing interleaving functions */
        !           114: #define        dkblock(bp)     ((bp)->b_blkno)
        !           115: #define        dkunit(bp)      (minor((bp)->b_dev) >> 3)
        !           116: #endif
        !           117: 
        !           118: #define        CBSIZE  60              /* number of chars in a clist block */
        !           119: #define        CROUND  0x3F            /* clist rounding; sizeof(int *) + CBSIZE -1*/
        !           120: 
        !           121: #ifndef KERNEL
        !           122: #include       <sys/types.h>
        !           123: #else
        !           124: #ifndef LOCORE
        !           125: #include       "../h/types.h"
        !           126: #endif
        !           127: #endif
        !           128: 
        !           129: /*
        !           130:  * File system parameters and macros.
        !           131:  *
        !           132:  * The file system is made out of blocks of at most MAXBSIZE units,
        !           133:  * with smaller units (fragments) only in the last direct block.
        !           134:  * MAXBSIZE primarily determines the size of buffers in the buffer
        !           135:  * pool. It may be made larger without any effect on existing
        !           136:  * file systems; however making it smaller make make some file
        !           137:  * systems unmountable.
        !           138:  *
        !           139:  * Note that the blocked devices are assumed to have DEV_BSIZE
        !           140:  * "sectors" and that fragments must be some multiple of this size.
        !           141:  * Block devices are read in BLKDEV_IOSIZE units. This number must
        !           142:  * be a power of two and in the range of
        !           143:  *     DEV_BSIZE <= BLKDEV_IOSIZE <= MAXBSIZE
        !           144:  * This size has no effect upon the file system, but is usually set
        !           145:  * to the block size of the root file system, so as to maximize the
        !           146:  * speed of ``fsck''.
        !           147:  */
        !           148: #define        MAXBSIZE        8192
        !           149: #define        DEV_BSIZE       1024
        !           150: #define        DEV_BSHIFT      10              /* log2(DEV_BSIZE) */
        !           151: #define BLKDEV_IOSIZE  1024            /* = NBPG for physical controllers */
        !           152: #define MAXFRAG        8
        !           153: 
        !           154: #define        btodb(bytes)                    /* calculates (bytes / DEV_BSIZE) */ \
        !           155:        ((unsigned)(bytes) >> DEV_BSHIFT)
        !           156: #define        dbtob(db)                       /* calculates (db * DEV_BSIZE) */ \
        !           157:        ((unsigned)(db) << DEV_BSHIFT)
        !           158: 
        !           159: /*
        !           160:  * Map a ``block device block'' to a file system block.
        !           161:  * This should be device dependent, and will be after we
        !           162:  * add an entry to cdevsw for that purpose.  For now though
        !           163:  * just use DEV_BSIZE.
        !           164:  */
        !           165: #define        bdbtofsb(bn)    ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
        !           166: 
        !           167: /*
        !           168:  * MAXPATHLEN defines the longest permissable path length
        !           169:  * after expanding symbolic links. It is used to allocate
        !           170:  * a temporary buffer from the buffer pool in which to do the
        !           171:  * name expansion, hence should be a power of two, and must
        !           172:  * be less than or equal to MAXBSIZE.
        !           173:  * MAXSYMLINKS defines the maximum number of symbolic links
        !           174:  * that may be expanded in a path name. It should be set high
        !           175:  * enough to allow all legitimate uses, but halt infinite loops
        !           176:  * reasonably quickly.
        !           177:  */
        !           178: #define MAXPATHLEN     1024
        !           179: #define MAXSYMLINKS    8
        !           180: 
        !           181: /*
        !           182:  * bit map related macros
        !           183:  */
        !           184: #define        setbit(a,i)     ((a)[(unsigned)(i)/NBBY] |= 1<<((unsigned)(i)%NBBY))
        !           185: #define        clrbit(a,i)     ((a)[(unsigned)(i)/NBBY] &= ~(1<<((unsigned)(i)%NBBY)))
        !           186: #define        isset(a,i)      ((a)[(unsigned)(i)/NBBY] & (1<<((unsigned)(i)%NBBY)))
        !           187: #define        isclr(a,i)      (((a)[(unsigned)(i)/NBBY] & (1<<((unsigned)(i)%NBBY))) == 0)
        !           188: 
        !           189: /*
        !           190:  * Macros for fast min/max.
        !           191:  */
        !           192: #define        MIN(a,b) (((a)<(b))?(a):(b))
        !           193: #define        MAX(a,b) (((a)>(b))?(a):(b))
        !           194: 
        !           195: /*
        !           196:  * Macros for counting and rounding.
        !           197:  */
        !           198: #define        howmany(x, y)   (((x)+((y)-1))/(y))
        !           199: #define        roundup(x, y)   ((((x)+((y)-1))/(y))*(y))

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