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Annotation of xinu/sys/ioinit.c, revision 1.1

1.1     ! root        1: /* ioinit.c - ioinit, iosetvec */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <iodisp.h>
        !             6: #include <io.h>
        !             7: 
        !             8: /*------------------------------------------------------------------------
        !             9:  *  ioinit --  standard interrupt vector and dispatch initialization
        !            10:  *------------------------------------------------------------------------
        !            11:  */
        !            12: ioinit(descrp)
        !            13: int    descrp;
        !            14: {
        !            15:        int     minor;
        !            16: 
        !            17:        if (isbaddev(descrp) )
        !            18:                return(SYSERR);
        !            19:        minor = devtab[descrp].dvminor;
        !            20:        iosetvec(descrp, minor, minor);
        !            21:        return(OK);
        !            22: }
        !            23: 
        !            24: /*------------------------------------------------------------------------
        !            25:  *  iosetvec  -  fill in interrupt vectors and dispatch table entries
        !            26:  *------------------------------------------------------------------------
        !            27:  */
        !            28: iosetvec(descrp, incode, outcode)
        !            29: int    descrp;
        !            30: int    incode;
        !            31: int    outcode;
        !            32: {
        !            33:        struct  devsw   *devptr;
        !            34:        struct  intmap  *map;
        !            35:        int     *vptr;
        !            36: 
        !            37:        if (isbaddev(descrp))
        !            38:                return(SYSERR);
        !            39:        devptr = &devtab[descrp];
        !            40:        map = &intmap[devptr->dvnum];   /* fill in interrupt dispatch   */
        !            41:        map->iin =  devptr->dviint;     /*   map with addresses of high-*/
        !            42:        map->icode = incode;            /*   level input and output     */
        !            43:        map->iout = devptr->dvoint;     /*   interrupt handlers and     */
        !            44:        map->ocode = outcode;           /*   minor device numbers       */
        !            45:        vptr = (int *)devptr->dvivec;
        !            46:        if (vptr != (int *)NULL)
        !            47:                *vptr = INTVECI+(descrp*2*DVECSIZE);/* fill in input interrupt*/
        !            48:        vptr = (int *)devptr->dvovec;
        !            49:        if (vptr != (int *)NULL)
        !            50:                *vptr = INTVECO+(descrp*2*DVECSIZE);/* fill in outpt interrupt*/
        !            51:        return(OK);
        !            52: }

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