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Annotation of xinu/h/dtc86.h, revision 1.1

1.1     ! root        1: /* dtc86.h */
        !             2: 
        !             3: /* Digital Technology Corp. DTC-86 disk controller host interface */
        !             4: 
        !             5: /*==============================================================================
        !             6:  * The following is the structure for the dtc controller interface registers.
        !             7:  *     You may notice that the bytes have been swapped.  This is due to the
        !             8:  *     way the 68000 does byte transfers.  See the User's Manual for details.
        !             9:  *==============================================================================
        !            10:  */
        !            11: 
        !            12: struct dtc     {                       /* controller interface regs.   */
        !            13:        char    dt_ccsr;                /* command completion status    */
        !            14:        char    dt_csr;                 /* control and status register  */
        !            15:        char    dt_darm;                /*      dar middle              */
        !            16:        char    dt_darl;                /* data address register - low  */
        !            17:        char    dt_carm;                /*      car middle              */
        !            18:        char    dt_carl;                /* command address register low */
        !            19:        char    dt_carh;                /* car high                     */
        !            20:        char    dt_darh;                /* dar high                     */
        !            21: };
        !            22: 
        !            23: /* bits in the dtc csr register */
        !            24: 
        !            25: #define        DTGO    0x00                    /* device start command         */
        !            26: #define        DTINTR  0x01                    /* enable interface interrupt   */
        !            27: #define        DTDONE  0x80                    /* command done                 */
        !            28: #define        DTERROR 0x02                    /* some error occurred          */
        !            29: #define        DTRESET 0x04                    /* reset the interface board    */
        !            30: 
        !            31: #define lbyte(value)   (char)(  ((long)value )       & (0xff))
        !            32: #define mbyte(value)   (char)( (((long)value ) >>8)  & (0xff))
        !            33: #define hbyte(value)   (char)( (((long)value ) >>16) & (0xff))

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