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Annotation of 40BSD/sys/h/param.h, revision 1.1

1.1     ! root        1: /*     param.h 4.1     11/9/80 */
        !             2: 
        !             3: /*
        !             4:  * tunable variables
        !             5:  *
        !             6:  * NB: NBUF must be less than MAXNBUF in locore.s.
        !             7:  */
        !             8: 
        !             9: #define        NBUF    128             /* size of buffer cache */
        !            10: #define        NINODE  400             /* number of in core inodes */
        !            11: #define        NFILE   350             /* number of in core file structures */
        !            12: #define        NMOUNT  15              /* number of mountable file systems */
        !            13: #define        MSWAPX  15              /* pseudo mount table index for swapdev */
        !            14: #define        MAXUPRC 25              /* max processes per user */
        !            15: #define        SSIZE   4               /* initial stack size (*512 bytes) */
        !            16: #define        SINCR   4               /* increment of stack (*512 bytes) */
        !            17: #define        NOFILE  20              /* max open files per process */
        !            18: #define        CANBSIZ 256             /* max size of typewriter line */
        !            19: #define        SMAPSIZ (4*NPROC)       /* size of swap allocation area */
        !            20: #define        NCALL   40              /* max simultaneous time callouts */
        !            21: #define        NPROC   250             /* max number of processes */
        !            22: #define        NTEXT   60              /* max number of pure texts */
        !            23: #define        NCLIST  500             /* max total clist size */
        !            24: #define        HZ      60              /* Ticks/second of the clock */
        !            25: #define        TIMEZONE (8*60)         /* Minutes westward from Greenwich */
        !            26: #define        DSTFLAG 1               /* Daylight Saving Time applies in this locality */
        !            27: #define        MSGBUFS 128             /* Characters saved from error messages */
        !            28: #define        NCARGS  10240           /* # characters in exec arglist */
        !            29: /*
        !            30:  * priorities
        !            31:  * probably should not be
        !            32:  * altered too much
        !            33:  */
        !            34: 
        !            35: #define        PSWP    0
        !            36: #define        PINOD   10
        !            37: #define        PRIBIO  20
        !            38: #define        PRIUBA  24
        !            39: #define        PZERO   25
        !            40: #define        PPIPE   26
        !            41: #define        PWAIT   30
        !            42: #define        PSLEP   40
        !            43: #define        PUSER   50
        !            44: 
        !            45: #define        NZERO   20
        !            46: 
        !            47: /*
        !            48:  * signals
        !            49:  * dont change
        !            50:  */
        !            51: 
        !            52: #ifndef        NSIG
        !            53: #include <signal.h>
        !            54: #endif
        !            55: 
        !            56: /*
        !            57:  * Return values from tsleep().
        !            58:  */
        !            59: #define        TS_OK   0       /* normal wakeup */
        !            60: #define        TS_TIME 1       /* timed-out wakeup */
        !            61: #define        TS_SIG  2       /* asynchronous signal wakeup */
        !            62: 
        !            63: /*
        !            64:  * fundamental constants of the implementation--
        !            65:  * cannot be changed easily.
        !            66:  * note: UPAGES is well known in locore.s
        !            67:  */
        !            68: 
        !            69: #define        NBPW    sizeof(int)     /* number of bytes in an integer */
        !            70: 
        !            71: #define        UPAGES  6               /* pages of u-area */
        !            72: #define        NULL    0
        !            73: #define        CMASK   0               /* default mask for file creation */
        !            74: #define        NODEV   (dev_t)(-1)
        !            75: #define        ROOTINO ((ino_t)2)      /* i number of all roots */
        !            76: #define        SUPERB  ((daddr_t)1)    /* block number of the super block */
        !            77: #define        DIRSIZ  14              /* max characters per directory */
        !            78: 
        !            79: /*
        !            80:  * Clustering of hardware pages on machines with ridiculously small
        !            81:  * page sizes is done here.  The paging subsystem deals with units of
        !            82:  * CLSIZE pte's describing NBPG (from vm.h) pages each... BSIZE must
        !            83:  * be CLSIZE*NBPG in the current implementation, that is the paging subsystem
        !            84:  * deals with the same size blocks that the file system uses.
        !            85:  *
        !            86:  * NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE
        !            87:  *
        !            88:  * NB: CLSIZE is well known in locore.s.
        !            89:  */
        !            90: #define        CLSIZE  2
        !            91: 
        !            92: /* give the base virtual address (first of CLSIZE) */
        !            93: #define        clbase(i)       ((i) &~ (CLSIZE-1))
        !            94: 
        !            95: /* round a number of clicks up to a whole cluster */
        !            96: #define        clrnd(i)        (((i) + (CLSIZE-1)) &~ (CLSIZE-1))
        !            97: 
        !            98: #if CLSIZE==1
        !            99: #define        BSIZE   512             /* size of secondary block (bytes) */
        !           100: #define        INOPB   8               /* 8 inodes per block */
        !           101: #define        BMASK   0777            /* BSIZE-1 */
        !           102: #define        BSHIFT  9               /* LOG2(BSIZE) */
        !           103: #define        NMASK   0177            /* NINDIR-1 */
        !           104: #define        NSHIFT  7               /* LOG2(NINDIR) */
        !           105: #define        NICINOD 100             /* number of superblock inodes */
        !           106: #define        NICFREE 50              /* number of superblock free blocks */
        !           107: 
        !           108: #endif
        !           109: 
        !           110: #if CLSIZE==2
        !           111: #define        BSIZE   1024
        !           112: #define        INOPB   16
        !           113: #define        BMASK   01777
        !           114: #define        BSHIFT  10
        !           115: #define        NMASK   0377
        !           116: #define        NSHIFT  8
        !           117: #define        NICINOD 100
        !           118: #define        NICFREE 178
        !           119: #endif
        !           120: 
        !           121: #if CLSIZE==4
        !           122: #define        BSIZE   2048
        !           123: #define        INOPB   32
        !           124: #define        BMASK   03777
        !           125: #define        BSHIFT  11
        !           126: #define        NMASK   0777
        !           127: #define        NSHIFT  9
        !           128: #define        NICINOD 100
        !           129: #define        NICFREE 434
        !           130: #endif
        !           131: 
        !           132: #ifndef INTRLVE
        !           133: /* macros replacing interleaving functions */
        !           134: #define        dkblock(bp)     ((bp)->b_blkno)
        !           135: #define        dkunit(bp)      (minor((bp)->b_dev) >> 3)
        !           136: #endif
        !           137: 
        !           138: /* inumber to disk address and inumber to disk offset */
        !           139: #define        itod(x) ((daddr_t)((((unsigned)(x)+2*INOPB-1)/INOPB)))
        !           140: #define        itoo(x) ((int)(((x)+2*INOPB-1)%INOPB))
        !           141: 
        !           142: /* file system blocks to disk blocks and back */
        !           143: #define        fsbtodb(b)      ((b)*CLSIZE)
        !           144: #define        dbtofsb(b)      ((b)/CLSIZE)
        !           145: 
        !           146: #define        NINDIR  (BSIZE/sizeof(daddr_t))
        !           147: 
        !           148: #define        CBSIZE  28              /* number of chars in a clist block */
        !           149: #define        CROUND  0x1F            /* clist rounding; sizeof(int *) + CBSIZE -1*/
        !           150: #define        CLKTICK (1000000/(HZ))  /* microseconds in a clock tick */
        !           151: 
        !           152: /*
        !           153:  * Macros for fast min/max
        !           154:  */
        !           155: #define        MIN(a,b) (((a)<(b))?(a):(b))
        !           156: #define        MAX(a,b) (((a)>(b))?(a):(b))
        !           157: 
        !           158: /*
        !           159:  * Some macros for units conversion
        !           160:  */
        !           161: /* Core clicks (512 bytes) to segments and vice versa */
        !           162: #define        ctos(x) (x)
        !           163: #define        stoc(x) (x)
        !           164: 
        !           165: /* Core clicks (512 bytes) to disk blocks */
        !           166: #define        ctod(x) (x)
        !           167: 
        !           168: /* clicks to bytes */
        !           169: #define        ctob(x) ((x)<<9)
        !           170: 
        !           171: /* bytes to clicks */
        !           172: #define        btoc(x) ((((unsigned)(x)+511)>>9))
        !           173: 
        !           174: /* major part of a device */
        !           175: #define        major(x)        ((int)(((unsigned)(x)>>8)&0377))
        !           176: 
        !           177: /* minor part of a device */
        !           178: #define        minor(x)        ((int)((x)&0377))
        !           179: 
        !           180: /* make a device number */
        !           181: #define        makedev(x,y)    ((dev_t)(((x)<<8) | (y)))
        !           182: 
        !           183: typedef        struct { int r[1]; } *  physadr;
        !           184: typedef        int             daddr_t;
        !           185: typedef        char *          caddr_t;
        !           186: typedef        unsigned short  ino_t;
        !           187: typedef        int             swblk_t;
        !           188: typedef        int             size_t;
        !           189: typedef        int             time_t;
        !           190: typedef        int             label_t[14];
        !           191: typedef        short           dev_t;
        !           192: typedef        int             off_t;
        !           193: 
        !           194: typedef        unsigned char   u_char;
        !           195: typedef        unsigned short  u_short;
        !           196: typedef        unsigned int    u_int;
        !           197: typedef        unsigned long   u_long;
        !           198: 
        !           199: /*
        !           200:  * Machine-dependent bits and macros
        !           201:  */
        !           202: #define        UMODE   PSL_CURMOD              /* usermode bits */
        !           203: #define        USERMODE(ps)    (((ps) & UMODE) == UMODE)
        !           204: 
        !           205: #define        BASEPRI(ps)     (((ps) & PSL_IPL) != 0)

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