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Annotation of xinu/sys/ioinit.c, revision 1.1.1.1

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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