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Annotation of 42BSD/sys/vax/rsp.h, revision 1.1

1.1     ! root        1: /*     rsp.h   6.1     83/07/29        */
        !             2: 
        !             3: /*
        !             4:  * TU58 transfer protocol constants and data structures
        !             5:  */
        !             6: 
        !             7: /*
        !             8:  * Structure of a command packet
        !             9:  */
        !            10: struct packet {
        !            11:        u_char  pk_flag;        /* indicates packet type (cmd, data, etc.) */
        !            12:        u_char  pk_mcount;      /* length of packet (bytes) */
        !            13:        u_char  pk_op;          /* operation to perform (read, write, etc.) */
        !            14:        u_char  pk_mod;         /* modifier for op or returned status */
        !            15:        u_char  pk_unit;        /* unit number */
        !            16:        u_char  pk_sw;          /* switches */
        !            17:        u_short pk_seq;         /* sequence number, always zero */
        !            18:        u_short pk_count;       /* requested byte count for read or write */
        !            19:        u_short pk_block;       /* block number for read, write, or seek */
        !            20:        u_short pk_chksum;      /* checksum, by words with end around carry */
        !            21: };
        !            22: 
        !            23: /*
        !            24:  * States
        !            25:  */
        !            26: #define        TUS_INIT1       0       /* sending nulls */
        !            27: #define        TUS_INIT2       1       /* sending inits */
        !            28: #define        TUS_IDLE        2       /* initialized, no transfer in progress */
        !            29: #define        TUS_SENDH       3       /* sending header */
        !            30: #define        TUS_SENDD       4       /* sending data */
        !            31: #define        TUS_SENDC       5       /* sending checksum */
        !            32: #define        TUS_SENDR       6       /* sending read command packet */
        !            33: #define        TUS_SENDW       7       /* sending write command packet */
        !            34: #define        TUS_GETH        8       /* reading header */
        !            35: #define        TUS_GETD        9       /* reading data */
        !            36: #define        TUS_GETC        10      /* reading checksum */
        !            37: #define        TUS_GET         11      /* reading an entire packet */
        !            38: #define        TUS_WAIT        12      /* waiting for continue */
        !            39: #define        TUS_RCVERR      13      /* receiver error in pseudo DMA routine */
        !            40: #define        TUS_CHKERR      14      /* checksum error in pseudo DMA routine */
        !            41: 
        !            42: #define        TUS_NSTATES     15
        !            43: 
        !            44: #define        printstate(state) \
        !            45:        if ((state) < TUS_NSTATES) \
        !            46:                printf("%s", tustates[(state)]); \
        !            47:        else \
        !            48:                printf("%d", (state));
        !            49: 
        !            50: /*
        !            51:  * Packet Flags
        !            52:  */
        !            53: #define        TUF_DATA        1               /* data packet */
        !            54: #define        TUF_CMD         2               /* command packet */
        !            55: #define        TUF_INITF       4               /* initialize */
        !            56: #define        TUF_CONT        020             /* continue */
        !            57: #define        TUF_XOFF        023             /* flow control */
        !            58: 
        !            59: /*
        !            60:  * Op Codes
        !            61:  */
        !            62: #define        TUOP_NOOP       0               /* no operation */
        !            63: #define        TUOP_INIT       1               /* initialize */
        !            64: #define        TUOP_READ       2               /* read block */
        !            65: #define        TUOP_WRITE      3               /* write block */
        !            66: #define        TUOP_SEEK       5               /* seek to block */
        !            67: #define TUOP_DIAGNOSE  7               /* run micro-diagnostics */
        !            68: #define        TUOP_END        0100            /* end packet */
        !            69: 
        !            70: /*
        !            71:  * Mod Flags
        !            72:  */
        !            73: #define TUMD_WRV        1               /* write with read verify */
        !            74: 
        !            75: /*
        !            76:  * Switches
        !            77:  */
        !            78: #define        TUSW_MRSP       010             /* use Modified RSP */
        !            79: 

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