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Annotation of researchv10dc/lsys/sys/xkb.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * for datakit simple kmc driver
        !             3:  */
        !             4: 
        !             5: /*
        !             6:  * per channel
        !             7:  */
        !             8: struct kb {
        !             9:        struct  queue *dkrq;
        !            10:        char    flag;
        !            11:        unsigned char   chan;
        !            12:        struct  kb *link;
        !            13: };
        !            14: 
        !            15: /*
        !            16:  * buffer descriptor
        !            17:  */
        !            18: struct kbdesc {
        !            19:        short loaddr;   /* low buffer address */
        !            20:        short len;      /* negative buffer length */
        !            21:        unsigned char chan;     /* channel */
        !            22:        char flag;      /* flags and high address */
        !            23: };
        !            24: 
        !            25: /*
        !            26:  * per interface
        !            27:  */
        !            28: 
        !            29: #define        XRING   40
        !            30: #define        RRING   20
        !            31: 
        !            32: struct kbkmc {
        !            33:        char    flags;
        !            34:        char    kno;            /* which kmc is ours */
        !            35:        char    ubno;           /* which unibus has the kmc */
        !            36:        struct device *addr;    /* kmc registers */
        !            37:        struct dkmodule *modp;
        !            38:        struct {        /* bundle for convenient unibus mapping */
        !            39:                struct kbdesc _xring[XRING+1];
        !            40:                struct kbdesc _rring[RRING+1];
        !            41:        } rings;
        !            42: #define        xring   rings._xring
        !            43: #define        rring   rings._rring
        !            44:        ubm_t   ringmap;
        !            45:        uaddr_t xrua, rrua;     /* unibus address of descriptor rings */
        !            46:        struct block *xblock[XRING];    /* blocks in transmit descriptors */
        !            47:        ubm_t   xmap[XRING];    /* and their map cookies */
        !            48:        struct block *rblock[RRING];    /* likewise receive */
        !            49:        ubm_t   rmap[RRING];
        !            50:        char xrp, xwp;          /* read, write positions in xring */
        !            51:        char rrp, rwp;          /* and in rring */
        !            52:        int     rbytes;         /* bytes of receive buffer outstanding */
        !            53: };

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