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Annotation of xinu/h/ether.h, revision 1.1

1.1     ! root        1: /* ether.h */
        !             2: 
        !             3: /* Ethernet definitions and constants */
        !             4: 
        !             5: #define        EMINPAK 64              /* minimum packet length                */
        !             6: #define        EMAXPAK 1536            /* maximum packet length                */
        !             7: #define        EHLEN   14              /* size of Ethernet packet header       */
        !             8: #define        EDLEN   EMAXPAK-EHLEN   /* length of data field in ether packet */
        !             9: #define        EPADLEN 6               /* number of octets in physical address */
        !            10: typedef        char    Eaddr[EPADLEN]; /* length of physical address (48 bits) */
        !            11: #define        EXRETRY 3               /* number of times to retry xmit errors */
        !            12: #define        EBCAST  "\377\377\377\377\377\377"/* Ethernet broadcast address */
        !            13: 
        !            14: struct eheader {               /* format of header in Ethernet packet  */
        !            15:        Eaddr   e_dest;         /* destination host address             */
        !            16:        Eaddr   e_src;          /* source host address                  */
        !            17:        short   e_ptype;        /* Ethernet packet type (see below)     */
        !            18: };
        !            19: 
        !            20: #define        EP_LOOP 0x0060          /* packet type: Loopback                */
        !            21: #define        EP_ECHO 0x0200          /* packet type: Echo                    */
        !            22: #define        EP_PUP  0x0400          /* packet type: Xerox PUP protocol      */
        !            23: #define        EP_IP   0x0800          /* packet type: DARPA Internet protocol */
        !            24: #define        EP_ARP  0x0806          /* packet type: Address resolution  "   */
        !            25: #define        EP_RARP 0x8035          /* packet type: reverse  "  "       "   */
        !            26: 
        !            27: struct epacket {               /* complete structure of Ethernet packet*/
        !            28:        struct  eheader ep_hdr; /* packet header                        */
        !            29:        char    ep_data[EDLEN]; /* data in the packet                   */
        !            30: };
        !            31: 
        !            32: /* Ethernet control block descriptions */
        !            33: 
        !            34: struct etblk   {
        !            35:        struct  dqregs *eioaddr;/* address of device csr                */
        !            36:        struct  devsw   *etdev; /* Address of device switch table entry */
        !            37:        Eaddr   etpaddr;        /* Ethernet physical device address     */
        !            38:        int     etrpid;         /* id of process reading from ethernet  */
        !            39:        int     etrsem;         /* mutex for reading from the ethernet  */
        !            40:        int     etwsem;         /* mutex for writing to the ethernet    */
        !            41:        int     etsetup;        /* DC_NORM or DC_SETUP for normal/setup */
        !            42:        int     etlen;          /* length of packet being written or 0  */
        !            43:        int     etwtry;         /* num. of times to retry xmit errors   */
        !            44:        struct  dcmd ercmd[2];  /* deqna read command descriptor plus   */
        !            45:                                /*  end-of-list                         */
        !            46:        struct  dcmd ewcmd[2];  /* deqna write command descriptor plus  */
        !            47:                                /*  end-of-list                         */
        !            48: };
        !            49: 
        !            50: extern struct  etblk   eth[];

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