Differential D24459 Diff 147476 sys/dev/xen/console/xen_console.c

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sys/dev/xen/console/xen_console.c

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xencons_tx(struct tty *tp)		xencons_tx(struct tty *tp)
{		{
bool cons_full;		bool cons_full;
char c;		char c;
struct xencons_priv *cons;		struct xencons_priv *cons;

cons = tty_softc(tp);		cons = tty_softc(tp);

tty_assert_locked(tp);		ttydisc_assert_locked(tp);

/*		/*
* Don't transmit any character if the buffer is full. Otherwise,		* Don't transmit any character if the buffer is full. Otherwise,
* characters may be lost		* characters may be lost
*/		*/
if (xencons_tx_full(cons))		if (xencons_tx_full(cons))
return (false);		return (false);

Show All 23 Lines	xencons_intr(void *arg)
/*		/*
* It's not necessary to retrieve input when the tty is not opened		* It's not necessary to retrieve input when the tty is not opened
*/		*/
if (!cons->opened)		if (!cons->opened)
return;		return;

xencons_rx(cons);		xencons_rx(cons);

tty_lock(tp);		ttydisc_lock(tp);
while ((ret = xencons_getc(cons)) != -1) {		while ((ret = xencons_getc(cons)) != -1) {
#ifdef KDB		#ifdef KDB
kdb_alt_break(ret, &cons->altbrk);		kdb_alt_break(ret, &cons->altbrk);
#endif		#endif
ttydisc_rint(tp, ret, 0);		ttydisc_rint(tp, ret, 0);
}		}
ttydisc_rint_done(tp);		ttydisc_rint_done(tp);
tty_unlock(tp);		ttydisc_unlock(tp);

/* Try to flush remaining characters if necessary */		/* Try to flush remaining characters if necessary */
xencons_tx_flush(cons, 0);		xencons_tx_flush(cons, 0);
}		}

/*		/*
* Helpers to call while shutting down:		* Helpers to call while shutting down:
* - Force flush all output		* - Force flush all output
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}		}

static void		static void
xencons_tty_outwakeup(struct tty *tp)		xencons_tty_outwakeup(struct tty *tp)
{		{
struct xencons_priv *cons;		struct xencons_priv *cons;

cons = tty_softc(tp);		cons = tty_softc(tp);
		ttydisc_assert_locked(tp);

callout_stop(&cons->callout);		callout_stop(&cons->callout);

if (!xencons_tx(tp))		if (!xencons_tx(tp))
callout_reset(&cons->callout, XC_POLLTIME,		callout_reset(&cons->callout, XC_POLLTIME,
xencons_timeout, tp);		xencons_timeout, tp);
}		}

Show All 36 Lines	xencons_attach(device_t dev)
int err;		int err;

cons = &main_cons;		cons = &main_cons;

tp = tty_alloc(&xencons_ttydevsw, cons);		tp = tty_alloc(&xencons_ttydevsw, cons);
tty_makedev(tp, NULL, "%s%r", driver_name, 0);		tty_makedev(tp, NULL, "%s%r", driver_name, 0);
device_set_softc(dev, tp);		device_set_softc(dev, tp);

callout_init_mtx(&cons->callout, tty_getlock(tp), 0);		callout_init_mtx(&cons->callout, ttydisc_getlock(tp), 0);

err = cons->ops->init(dev, tp, xencons_intr);		err = cons->ops->init(dev, tp, xencons_intr);
if (err != 0) {		if (err != 0) {
device_printf(dev, "Unable to initialize the console (%d)\n",		device_printf(dev, "Unable to initialize the console (%d)\n",
err);		err);
return (err);		return (err);
}		}

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