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

1.1     ! root        1: /* dsinit.c - dsinit */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <disk.h>
        !             6: 
        !             7: #ifdef Ndsk
        !             8: struct dsblk   dstab[Ndsk];
        !             9: #endif
        !            10: int    dskdbp, dskrbp;
        !            11: 
        !            12: /*------------------------------------------------------------------------
        !            13:  *  dsinit  --  initialize disk drive device
        !            14:  *------------------------------------------------------------------------
        !            15:  */
        !            16: dsinit(devptr)
        !            17:        struct  devsw   *devptr;
        !            18: {
        !            19:        struct  dsblk   *dsptr;
        !            20:        struct  dtc     *dtptr;
        !            21:        int     status;
        !            22:        char    ps;
        !            23: 
        !            24:        disable(ps);
        !            25:        devptr->dvioblk = dsptr = &dstab[ devptr->dvminor ];
        !            26:        dsptr->dcsr    = devptr->dvcsr;
        !            27:        dsptr->dreqlst = DRNULL;
        !            28:        dsptr->dnum    = devptr->dvnum;
        !            29:        dsptr->dibsem  = screate(1);
        !            30:        dsptr->dflsem  = screate(1);
        !            31:        dsptr->ddirsem = screate(1);
        !            32:        dsptr->dnfiles = 0;
        !            33:        dsptr->ddir    = getbuf(dskdbp);
        !            34:        iosetvec(devptr->dvnum, dsptr, dsptr);
        !            35: 
        !            36:        /* read directory block: setup read command then start interface */
        !            37: 
        !            38:        dsptr->ddcb.xop    = (char) XOREAD;
        !            39:        dsptr->ddcb.xunit  = (char) 0;
        !            40:        dsptr->ddcb.xcntl  = (char) XRETRY;
        !            41:        dsptr->ddcb.xmaddr = (char) ((DIRBLK>>8)&(0377));
        !            42:        dsptr->ddcb.xladdr = (char) (DIRBLK&0377);
        !            43:        dsptr->ddcb.xcount = (char) 1;
        !            44:        dtptr = dsptr->dcsr;
        !            45:        dtptr->dt_dar   = dsptr->ddir;
        !            46:        dtptr->dt_car   = &dsptr->ddcb;
        !            47:        dtptr->dt_xdar  = dtptr->dt_xcar = NULL;
        !            48:        dtptr->dt_csr   = DTGO;
        !            49:        while ( ( (status=dtptr->dt_csr) & DTDONE) == 0)
        !            50:                ;
        !            51:        if (status & DTERROR)
        !            52:                panic("Disk error");
        !            53:        restore(ps);
        !            54:        return(OK);
        !            55: }

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