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Annotation of 42BSD/sys/vax/rsp.h, revision 1.1.1.1

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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