Return to ttyoin.c CVS log

Up to [XINU] / xinu / sys

Annotation of xinu/sys/ttyoin.c, revision 1.1.1.2

1.1       root        1: /* ttyoin.c - ttyoin */
                      2: 
                      3: #include <conf.h>
                      4: #include <kernel.h>
                      5: #include <tty.h>
                      6: #include <io.h>
1.1.1.2 ! root        7: 
        !             8: /* set up macros for appropriate SLU as spec. by SLUCHIP:
        !             9:    if SLUCHIP==6850, #include slu6850.h, #define TTYOIN ttyoin6850, etc.
        !            10:    if SLUCHIP==7201, #include slu7201.h, #define TTYOIN ttyoin7201, etc.
        !            11:    if SLUCHIP undef.,#include slu.h, #define TTYOIN ttyoin  (orig. case)
        !            12:    similarly sluaccess.h, other TTY fns */
        !            13: #include <sluinclude.h>
1.1       root       14: 
                     15: /*------------------------------------------------------------------------
1.1.1.2 ! root       16:  *  ttyoin  --  output character to uart
1.1       root       17:  *------------------------------------------------------------------------
                     18:  */
1.1.1.2 ! root       19: TTYOIN(ttyp, cptr)
        !            20:        register struct tty     *ttyp;
1.1       root       21:        register struct csr     *cptr;
1.1.1.2 ! root       22: {
        !            23:        int     count;
1.1       root       24: 
1.1.1.2 ! root       25:        if (ttyp->ehead != ttyp->etail) {
        !            26:                sluputch(cptr, ttyp->ebuff[ttyp->etail++]);
        !            27:                if (ttyp->etail >= EBUFLEN)
        !            28:                        ttyp->etail = 0;
1.1       root       29:                return;
                     30:        }
1.1.1.2 ! root       31:        if (ttyp->oheld) {      /* honor flow control   */
        !            32:                slutdisable(cptr); /* disable transmitter ints if on */
1.1       root       33:                return;
                     34:        }
1.1.1.2 ! root       35:        if ((count=scount(ttyp->osem)) < OBUFLEN) {
        !            36:                sluputch(cptr, ttyp->obuff[ttyp->otail++]);
        !            37:                if (ttyp->otail >= OBUFLEN)
        !            38:                        ttyp->otail = 0;
        !            39:                if (count > OBMINSP)
        !            40:                        signal(ttyp->osem);
        !            41:                else if ( ++(ttyp->odsend) == OBMINSP) {
        !            42:                        ttyp->odsend = 0;
        !            43:                        signaln(ttyp->osem, OBMINSP);
1.1       root       44:                }
                     45:        } else
1.1.1.2 ! root       46:                slutdisable(cptr);
1.1       root       47: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.