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

1.1     ! root        1: /* sluint.c - sluint */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <tty.h>
        !             6: #include <io.h>
        !             7: 
        !             8: /* set up macros for appropriate SLU as spec. by SLUCHIP:
        !             9:    if SLUCHIP==6850, #include slu6850.h, #define SLUINT sluint6850, etc.
        !            10:    if SLUCHIP==7201, #include slu7201.h, #define SLUINT sluint7201, etc.
        !            11:    if SLUCHIP undef.,#include slu.h, #define SLUINT sluint  (orig. case)
        !            12:    similarly sluaccess.h, other TTY fns */
        !            13: #include <sluinclude.h>
        !            14: 
        !            15: /*------------------------------------------------------------------------
        !            16:  *  sluint  --  interrupt dispatcher 
        !            17:  *  Xinu assumes separate int vecs for receiver and transmitter,
        !            18:  *  but MC6850/NEC7201 has only one common one, so need this.
        !            19:  *------------------------------------------------------------------------
        !            20:  */
        !            21: INTPROC SLUINT(descrp)
        !            22:        int descrp;
        !            23: {
        !            24:        register struct tty     *ttyp;
        !            25:        register struct csr     *cptr;
        !            26: 
        !            27: #ifdef DEBUG
        !            28:        dotrace ("sluint",NULL,0);
        !            29: #endif
        !            30:        ttyp = (struct tty *) devtab[descrp].dvioblk ;
        !            31:        cptr = (struct csr *) ttyp->ioaddr ;
        !            32:        if (slurecvready(cptr)) {
        !            33:          TTYIIN(ttyp, cptr, FALSE);
        !            34:          return(OK);
        !            35:        }
        !            36:        if (slutransready(cptr)) {
        !            37:          TTYOIN(ttyp, cptr);
        !            38:          return(OK);
        !            39:        }
        !            40:        /* should not get here */
        !            41:        panic("SLU interrupt but device not ready");
        !            42: }

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