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Annotation of researchv8dc/sys/chaos/dev.h, revision 1.1

1.1     ! root        1: #ifndef _CHDEV_
        !             2: #define _CHDEV_
        !             3: 
        !             4: /*
        !             5:  * This file defines how the UNIX minor device number is used by the UNIX
        !             6:  * Chaos N.C.P.
        !             7:  *
        !             8:  * The minor device is divided into 2 fields: host and (contact) name
        !             9:  * The low order CHNBITS specifies how to get the contact name,
        !            10:  * the next higher order CHHBITS specifies how to get the host address.
        !            11:  *
        !            12:  * Host field definitions:
        !            13:  */
        !            14: #define CHHBITS                4               /* Number of bits of host specifier */
        !            15: #define CHHMAX         ((1 << CHHBITS) - 1)
        !            16:                                        /*  Maximum value of host field */
        !            17: #define CHHMASK                CHHMAX          /* Mask after shift for host */
        !            18: #define CHHSHIFT       (8-CHHBITS-1)   /* Right shift of minor for host */
        !            19: #define CHHOST(dev)    ((minor(dev) >> CHHSHIFT) & CHHMASK)
        !            20:                                        /* Extraction macro */
        !            21: #define CHHSPEC                CHHMAX          /* Value for special devices */
        !            22: #define CHHREAD                CHHMAX-1        /* Host number is in rest of path */
        !            23: #define CHHUSE         CHHMAX-2        /* Host number is in last component */
        !            24: #define CHHMAXN                CHHMAX-2        /* Max number of auto hosts numbers */
        !            25: 
        !            26: /*
        !            27:  * Name field values for special devices:
        !            28:  */
        !            29: #define CHUNMATCHED    0       /* Minor device for unmatched RFC reader */
        !            30: #define CHLISTEN       1       /* Listen */
        !            31: 
        !            32: /*
        !            33:  * Contact name field definitions:
        !            34:  */
        !            35: #define CHNBITS                (8 - CHHBITS - 1)
        !            36: #define CHNMAX         ((1 << CHNBITS) - 1)    /* Max value of field */
        !            37: #define CHNMASK                CHNMAX                  /* Mask for extraction */
        !            38: #define CHNAME(dev)    (minor(dev) & CHNMASK)  /* Extraction macro */
        !            39: #define CHNREAD                CHNMAX          /* Contact name is rest of path */
        !            40: #define CHNUSE         CHNMAX-1        /* Contact name is last component */
        !            41: #define CHNMAXN                CHNMAX-1        /* Max number of auto contact names */
        !            42: 
        !            43: #define CHMKMIN(h,n)   ((h << CHHSHIFT) | n)
        !            44: #define CHURFCMIN      CHMKMIN(CHHSPEC, CHUNMATCHED)
        !            45: #define CHLISTMIN      CHMKMIN(CHHSPEC, CHLISTEN)
        !            46: #define CHRFCAMIN      CHMKMIN(CHHREAD, CHNREAD)
        !            47: #define CHRFCMIN       (CHHANGMIN | (CHRFCAMIN))
        !            48: #define CHHANGMIN      0200
        !            49: #define CHHANGDEV(dev) (minor(dev)&0200)
        !            50: 
        !            51: #define NONAME         ((char *)0)
        !            52: 
        !            53: extern char *chnames[][3];
        !            54: extern short chhosts[];                /* Array of "well known hosts" */
        !            55: 
        !            56: /*
        !            57:  * For the channel driver, and some user programs, we need to know a
        !            58:  * purposely invalid minor device number
        !            59:  */
        !            60: #define CHBADCHAN      255
        !            61: #endif

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