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Annotation of xinu/sys/LSI/dskstrt.c, revision 1.1

1.1     ! root        1: /* dskstrt.c - dskstrt */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <disk.h>
        !             6: 
        !             7: /*------------------------------------------------------------------------
        !             8:  *  dskstrt  --  start an I/O operation on a disk device
        !             9:  *------------------------------------------------------------------------
        !            10:  */
        !            11: dskstrt(dsptr)
        !            12:        struct  dsblk   *dsptr;
        !            13: {
        !            14:        struct  xbdcb   *xptr;
        !            15:        struct  dtc     *dtptr;
        !            16:        struct  dreq    *drptr;
        !            17: 
        !            18:        /* build command for controller */
        !            19: 
        !            20:        drptr = dsptr->dreqlst;
        !            21:        xptr = & dsptr->ddcb;
        !            22:        xptr->xop    = (char) drptr->drop;              /* opcode       */
        !            23:        xptr->xunit  = (char) 0;                        /* top addr bits*/
        !            24:        xptr->xmaddr = (char) ((drptr->drdba>>8)&0377); /* mid addr bits*/
        !            25:        xptr->xladdr = (char) (drptr->drdba & 0377);    /* low addr bits*/
        !            26:        xptr->xcount = (char) 1;                        /* num of blocks*/
        !            27:        xptr->xcntl  = (char) XRETRY;                   /* retry code   */
        !            28: 
        !            29:        /* feed command to controller through interface */
        !            30: 
        !            31:        dtptr = dsptr->dcsr;
        !            32:        dtptr->dt_dar = drptr->drbuff;
        !            33:        dtptr->dt_car = xptr;
        !            34:        dtptr->dt_xdar = dtptr->dt_xcar = 0;
        !            35:        dtptr->dt_csr = DTINTR | DTGO;
        !            36: }

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