Introduce ttyread() and ttywrite() which do the canonical thing.

Use them in many tty drivers.

Reviewed by: julian, bde

23 files changed, 70 insertions, 597 deletions

diff --git a/sys/alpha/alpha/promcons.c b/sys/alpha/alpha/promcons.c
index 14305fb..8b4d3b1 100644
--- a/sys/alpha/alpha/promcons.c
+++ b/sys/alpha/alpha/promcons.c
@@ -61,16 +61,14 @@
 
 static	d_open_t	promopen;
 static	d_close_t	promclose;
-static	d_read_t	promread;
-static	d_write_t	promwrite;
 static	d_ioctl_t	promioctl;
 
 #define CDEV_MAJOR 97
 static struct cdevsw prom_cdevsw = {
 	/* open */	promopen,
 	/* close */	promclose,
-	/* read */	promread,
-	/* write */	promwrite,
+	/* read */	ttyread,
+	/* write */	ttywrite,
 	/* ioctl */	promioctl,
 	/* poll */	ttypoll,
 	/* mmap */	nommap,
@@ -161,28 +159,6 @@ promclose(dev, flag, mode, p)
 }
  
 int
-promread(dev, uio, flag)
-	dev_t dev;
-	struct uio *uio;
-	int flag;
-{
-	struct tty *tp = &prom_tty[minor(dev)];
-
-	return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
-}
- 
-int
-promwrite(dev, uio, flag)
-	dev_t dev;
-	struct uio *uio;
-	int flag;
-{
-	struct tty *tp = &prom_tty[minor(dev)];
- 
-	return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
-}
- 
-int
 promioctl(dev, cmd, data, flag, p)
 	dev_t dev;
 	u_long cmd;
diff --git a/sys/alpha/tlsb/zs_tlsb.c b/sys/alpha/tlsb/zs_tlsb.c
index 9c3944b..e13f196 100644
--- a/sys/alpha/tlsb/zs_tlsb.c
+++ b/sys/alpha/tlsb/zs_tlsb.c
@@ -64,16 +64,14 @@ struct zs_softc {
 
 static	d_open_t	zsopen;
 static	d_close_t	zsclose;
-static	d_read_t	zsread;
-static	d_write_t	zswrite;
 static	d_ioctl_t	zsioctl;
 
 #define CDEV_MAJOR 98
 static struct cdevsw zs_cdevsw = {
 	/* open */	zsopen,
 	/* close */	zsclose,
-	/* read */	zsread,
-	/* write */	zswrite,
+	/* read */	ttyread,
+	/* write */	ttywrite,
 	/* ioctl */	zsioctl,
 	/* poll */	ttypoll,
 	/* mmap */	nommap,
@@ -303,20 +301,6 @@ zsclose(dev_t dev, int flag, int mode, struct proc *p)
 }
  
 static int
-zsread(dev_t dev, struct uio *uio, int flag)
-{
-	struct tty *tp = &ZS_SOFTC(minor(dev))->tty;
-	return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
-}
- 
-static int
-zswrite(dev_t dev, struct uio *uio, int flag)
-{
-	struct tty *tp = &ZS_SOFTC(minor(dev))->tty;
-	return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
-}
- 
-static int
 zsioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
 {
 	struct tty *tp = &ZS_SOFTC(minor(dev))->tty;
diff --git a/sys/dev/cy/cy.c b/sys/dev/cy/cy.c
index 472544a..041b4dd 100644
--- a/sys/dev/cy/cy.c
+++ b/sys/dev/cy/cy.c
@@ -132,7 +132,6 @@
 #define	sioopen		cyopen
 #define	siopoll		cypoll
 #define	sioprobe	cyprobe
-#define	sioread		cyread
 #define	siosettimeout	cysettimeout
 #define	siosetwater	cysetwater
 #define	comstop		cystop
@@ -367,7 +366,6 @@ struct isa_driver	siodriver = {
 
 static	d_open_t	sioopen;
 static	d_close_t	sioclose;
-static	d_read_t	sioread;
 static	d_write_t	siowrite;
 static	d_ioctl_t	sioioctl;
 
@@ -375,7 +373,7 @@ static	d_ioctl_t	sioioctl;
 static struct cdevsw sio_cdevsw = {
 	/* open */	sioopen,
 	/* close */	sioclose,
-	/* read */	sioread,
+	/* read */	ttyread,
 	/* write */	siowrite,
 	/* ioctl */	sioioctl,
 	/* poll */	ttypoll,
@@ -940,22 +938,6 @@ comhardclose(com)
 }
 
 static int
-sioread(dev, uio, flag)
-	dev_t		dev;
-	struct uio	*uio;
-	int		flag;
-{
-	int		mynor;
-	struct tty	*tp;
-
-	mynor = minor(dev);
-	if (mynor & CONTROL_MASK)
-		return (ENODEV);
-	tp = com_addr(MINOR_TO_UNIT(mynor))->tp;
-	return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
-}
-
-static int
 siowrite(dev, uio, flag)
 	dev_t		dev;
 	struct uio	*uio;
diff --git a/sys/dev/cy/cy_isa.c b/sys/dev/cy/cy_isa.c
index 472544a..041b4dd 100644
--- a/sys/dev/cy/cy_isa.c
+++ b/sys/dev/cy/cy_isa.c
@@ -132,7 +132,6 @@
 #define	sioopen		cyopen
 #define	siopoll		cypoll
 #define	sioprobe	cyprobe
-#define	sioread		cyread
 #define	siosettimeout	cysettimeout
 #define	siosetwater	cysetwater
 #define	comstop		cystop
@@ -367,7 +366,6 @@ struct isa_driver	siodriver = {
 
 static	d_open_t	sioopen;
 static	d_close_t	sioclose;
-static	d_read_t	sioread;
 static	d_write_t	siowrite;
 static	d_ioctl_t	sioioctl;
 
@@ -375,7 +373,7 @@ static	d_ioctl_t	sioioctl;
 static struct cdevsw sio_cdevsw = {
 	/* open */	sioopen,
 	/* close */	sioclose,
-	/* read */	sioread,
+	/* read */	ttyread,
 	/* write */	siowrite,
 	/* ioctl */	sioioctl,
 	/* poll */	ttypoll,
@@ -940,22 +938,6 @@ comhardclose(com)
 }
 
 static int
-sioread(dev, uio, flag)
-	dev_t		dev;
-	struct uio	*uio;
-	int		flag;
-{
-	int		mynor;
-	struct tty	*tp;
-
-	mynor = minor(dev);
-	if (mynor & CONTROL_MASK)
-		return (ENODEV);
-	tp = com_addr(MINOR_TO_UNIT(mynor))->tp;
-	return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
-}
-
-static int
 siowrite(dev, uio, flag)
 	dev_t		dev;
 	struct uio	*uio;
diff --git a/sys/dev/dgb/dgb.c b/sys/dev/dgb/dgb.c
index ea7b548..481eaf6 100644
--- a/sys/dev/dgb/dgb.c
+++ b/sys/dev/dgb/dgb.c
@@ -204,16 +204,14 @@ struct isa_driver	dgbdriver = {
 
 static	d_open_t	dgbopen;
 static	d_close_t	dgbclose;
-static	d_read_t	dgbread;
-static	d_write_t	dgbwrite;
 static	d_ioctl_t	dgbioctl;
 
 #define	CDEV_MAJOR	58
 static struct cdevsw dgb_cdevsw = {
 	/* open */	dgbopen,
 	/* close */	dgbclose,
-	/* read */	dgbread,
-	/* write */	dgbwrite,
+	/* read */	ttyread,
+	/* write */	ttywrite,
 	/* ioctl */	dgbioctl,
 	/* poll */	ttypoll,
 	/* mmap */	nommap,
@@ -1198,55 +1196,7 @@ static void
 dgb_pause(chan)
 	void *chan;
 {
-wakeup((caddr_t)chan);
-}
-
-
-static	int
-dgbread(dev, uio, flag)
-	dev_t		dev;
-	struct uio	*uio;
-	int		flag;
-{
-	int		mynor;
-	struct tty	*tp;
-	int error, unit, pnum;
-
-	mynor=minor(dev);
-	if (mynor & CONTROL_MASK)
-		return (ENODEV);
-	unit=MINOR_TO_UNIT(mynor);
-	pnum=MINOR_TO_PORT(mynor);
-
-	tp=&dgb_softc[unit].ttys[pnum];
-
-	error=linesw[tp->t_line].l_read(tp, uio, flag);
-	DPRINT4(DB_RD,"dgb%d: port%d: read() returns %d\n",unit,pnum,error);
-	return error;
-}
-
-static	int
-dgbwrite(dev, uio, flag)
-	dev_t		dev;
-	struct uio	*uio;
-	int		flag;
-{
-	int		mynor;
-	struct tty	*tp;
-	int error, unit, pnum;
-
-	mynor=minor(dev);
-	if (mynor & CONTROL_MASK)
-		return (ENODEV);
-
-	unit=MINOR_TO_UNIT(mynor);
-	pnum=MINOR_TO_PORT(mynor);
-
-	tp=&dgb_softc[unit].ttys[pnum];
-
-	error=linesw[tp->t_line].l_write(tp, uio, flag);
-	DPRINT4(DB_WR,"dgb%d: port%d: write() returns %d\n",unit,pnum,error);
-	return error;
+	wakeup((caddr_t)chan);
 }
 
 static void
diff --git a/sys/dev/dgb/dgm.c b/sys/dev/dgb/dgm.c
index 4a2ec53..3732302 100644
--- a/sys/dev/dgb/dgm.c
+++ b/sys/dev/dgb/dgm.c
@@ -208,16 +208,14 @@ struct isa_driver	dgmdriver = {
 
 static	d_open_t	dgmopen;
 static	d_close_t	dgmclose;
-static	d_read_t	dgmread;
-static	d_write_t	dgmwrite;
 static	d_ioctl_t	dgmioctl;
 
 #define	CDEV_MAJOR	101
 static struct cdevsw dgm_cdevsw = {
 	/* open */	dgmopen,
 	/* close */	dgmclose,
-	/* read */	dgmread,
-	/* write */	dgmwrite,
+	/* read */	ttyread,
+	/* write */	ttywrite,
 	/* ioctl */	dgmioctl,
 	/* poll */	ttypoll,
 	/* mmap */	nommap,
@@ -1005,52 +1003,6 @@ wakeup((caddr_t)chan);
 }
 
 
-static	int
-dgmread(dev, uio, flag)
-	dev_t		dev;
-	struct uio	*uio;
-	int		flag;
-{
-	int		mynor;
-	struct tty	*tp;
-	int error, unit, pnum;
-
-	mynor=minor(dev);
-	if (mynor & CONTROL_MASK)
-		return (ENODEV);
-	unit=MINOR_TO_UNIT(mynor);
-	pnum=MINOR_TO_PORT(mynor);
-
-	tp=&dgm_softc[unit].ttys[pnum];
-	error=linesw[tp->t_line].l_read(tp, uio, flag);
-	DPRINT4(DB_RD,"dgm%d: port%d: read() returns %d\n",unit,pnum,error);
-	return error;
-}
-
-static	int
-dgmwrite(dev, uio, flag)
-	dev_t		dev;
-	struct uio	*uio;
-	int		flag;
-{
-	int		mynor;
-	struct tty	*tp;
-	int error, unit, pnum;
-
-	mynor=minor(dev);
-	if (mynor & CONTROL_MASK)
-		return (ENODEV);
-
-	unit=MINOR_TO_UNIT(mynor);
-	pnum=MINOR_TO_PORT(mynor);
-
-	tp=&dgm_softc[unit].ttys[pnum];
-
-	error=linesw[tp->t_line].l_write(tp, uio, flag);
-	DPRINT4(DB_WR,"dgm%d: port%d: write() returns %d\n",unit,pnum,error);
-	return error;
-}
-
 static void
 dgmpoll(unit_c)
 	void *unit_c;
diff --git a/sys/dev/rc/rc.c b/sys/dev/rc/rc.c
index 91b735e..f437eec 100644
--- a/sys/dev/rc/rc.c
+++ b/sys/dev/rc/rc.c
@@ -87,16 +87,14 @@ struct isa_driver rcdriver = {
 
 static	d_open_t	rcopen;
 static	d_close_t	rcclose;
-static	d_read_t	rcread;
-static	d_write_t	rcwrite;
 static	d_ioctl_t	rcioctl;
 
 #define	CDEV_MAJOR	63
 static struct cdevsw rc_cdevsw = {
 	/* open */	rcopen,
 	/* close */	rcclose,
-	/* read */	rcread,
-	/* write */	rcwrite,
+	/* read */	ttyread,
+	/* write */	ttywrite,
 	/* ioctl */	rcioctl,
 	/* poll */	ttypoll,
 	/* mmap */	nommap,
@@ -865,30 +863,6 @@ register struct rc_chans *rc;
 	(void) splx(s);
 }
 
-/* Read from line */
-static	int
-rcread(dev, uio, flag)
-	dev_t           dev;
-	struct uio      *uio;
-	int             flag;
-{
-	struct tty *tp = rc_chans[GET_UNIT(dev)].rc_tp;
-
-	return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
-}
-
-/* Write to line */
-static	int
-rcwrite(dev, uio, flag)
-	dev_t           dev;
-	struct uio      *uio;
-	int             flag;
-{
-	struct tty *tp = rc_chans[GET_UNIT(dev)].rc_tp;
-
-	return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
-}
-
 /* Reset the bastard */
 static void rc_hwreset(unit, nec, chipid)
 	register int    unit, nec;
diff --git a/sys/dev/rp/rp.c b/sys/dev/rp/rp.c
index 5a4cceb..bc846d5 100644
--- a/sys/dev/rp/rp.c
+++ b/sys/dev/rp/rp.c
@@ -794,7 +794,6 @@ static	char	driver_name[] = "rp";
 
 static	d_open_t	rpopen;
 static	d_close_t	rpclose;
-static	d_read_t	rpread;
 static	d_write_t	rpwrite;
 static	d_ioctl_t	rpioctl;
 
@@ -802,7 +801,7 @@ static	d_ioctl_t	rpioctl;
 static struct cdevsw rp_cdevsw = {
 	/* open */	rpopen,
 	/* close */	rpclose,
-	/* read */	rpread,
+	/* read */	ttyread,
 	/* write */	rpwrite,
 	/* ioctl */	rpioctl,
 	/* poll */	ttypoll,
@@ -856,9 +855,6 @@ static	int	rpparam __P((struct tty *, struct termios *));
 static	void	rpstart __P((struct tty *));
 static	void	rpstop __P((struct tty *, int));
 static	void	rphardclose	__P((struct rp_port *));
-#define rpmap	nomap
-#define rpreset noreset
-#define rpstrategy	nostrategy
 static	void	rp_disc_optim	__P((struct tty *tp, struct termios *t,
 						struct rp_port	*rp));
 
@@ -1504,30 +1500,6 @@ rphardclose(struct rp_port *rp)
 
 static
 int
-rpread(dev, uio, flag)
-	dev_t	dev;
-	struct	uio	*uio;
-	int	flag;
-{
-	struct	rp_port *rp;
-	struct	tty	*tp;
-	int	unit, mynor, umynor, port, error = 0; /* SG */
-
-   umynor = (((minor(dev) >> 16) -1) * 32);    /* SG */
-	port  = (minor(dev) & 0x1f);                /* SG */
-	mynor = (port + umynor);                    /* SG */
-   unit = minor_to_unit[mynor];                /* SG */
-
-	if(IS_CONTROL(dev))
-		return(ENODEV);
-	rp = rp_addr(unit) + port;
-	tp = rp->rp_tty;
-	error = (*linesw[tp->t_line].l_read)(tp, uio, flag);
-	return(error);
-}
-
-static
-int
 rpwrite(dev, uio, flag)
 	dev_t	dev;
 	struct	uio	*uio;
diff --git a/sys/dev/si/si.c b/sys/dev/si/si.c
index 79097ca..1de0aae 100644
--- a/sys/dev/si/si.c
+++ b/sys/dev/si/si.c
@@ -169,7 +169,6 @@ DATA_SET(eisadriver_set, si_eisa_driver);
 
 static	d_open_t	siopen;
 static	d_close_t	siclose;
-static	d_read_t	siread;
 static	d_write_t	siwrite;
 static	d_ioctl_t	siioctl;
 
@@ -177,7 +176,7 @@ static	d_ioctl_t	siioctl;
 static struct cdevsw si_cdevsw = {
 	/* open */	siopen,
 	/* close */	siclose,
-	/* read */	siread,
+	/* read */	ttyread,
 	/* write */	siwrite,
 	/* ioctl */	siioctl,
 	/* poll */	ttypoll,
@@ -1389,29 +1388,6 @@ sidtrwakeup(chan)
 	splx(oldspl);
 }
 
-/*
- * User level stuff - read and write
- */
-static	int
-siread(dev, uio, flag)
-	register dev_t dev;
-	struct uio *uio;
-	int flag;
-{
-	register struct tty *tp;
-	int mynor = minor(dev);
-
-	if (IS_SPECIAL(mynor)) {
-		DPRINT((0, DBG_ENTRY|DBG_FAIL|DBG_READ, "siread(CONTROLDEV!!)\n"));
-		return(ENODEV);
-	}
-	tp = MINOR2TP(mynor);
-	DPRINT((TP2PP(tp), DBG_ENTRY|DBG_READ,
-		"siread(%s,%x,%x)\n", devtoname(dev), uio, flag));
-	return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
-}
-
-
 static	int
 siwrite(dev, uio, flag)
 	dev_t dev;
diff --git a/sys/dev/syscons/syscons.c b/sys/dev/syscons/syscons.c
index 4cff39f..552aacd 100644
--- a/sys/dev/syscons/syscons.c
+++ b/sys/dev/syscons/syscons.c
@@ -205,7 +205,6 @@ CONS_DRIVER(sc, sccnprobe, sccninit, sccnterm, sccngetc, sccncheckc, sccnputc);
 static	d_open_t	scopen;
 static	d_close_t	scclose;
 static	d_read_t	scread;
-static	d_write_t	scwrite;
 static	d_ioctl_t	scioctl;
 static	d_mmap_t	scmmap;
 
@@ -213,7 +212,7 @@ static struct cdevsw sc_cdevsw = {
 	/* open */	scopen,
 	/* close */	scclose,
 	/* read */	scread,
-	/* write */	scwrite,
+	/* write */	ttywrite,
 	/* ioctl */	scioctl,
 	/* poll */	ttypoll,
 	/* mmap */	scmmap,
@@ -579,18 +578,9 @@ scclose(dev_t dev, int flag, int mode, struct proc *p)
 int
 scread(dev_t dev, struct uio *uio, int flag)
 {
-    struct tty *tp = dev->si_tty;
 
     sc_touch_scrn_saver();
-    return((*linesw[tp->t_line].l_read)(tp, uio, flag));
-}
-
-int
-scwrite(dev_t dev, struct uio *uio, int flag)
-{
-    struct tty *tp = dev->si_tty;
-
-    return((*linesw[tp->t_line].l_write)(tp, uio, flag));
+    return(ttyread(dev, uio, flag));
 }
 
 static int
diff --git a/sys/gnu/i386/isa/dgb.c b/sys/gnu/i386/isa/dgb.c
index ea7b548..481eaf6 100644
--- a/sys/gnu/i386/isa/dgb.c
+++ b/sys/gnu/i386/isa/dgb.c
@@ -204,16 +204,14 @@ struct isa_driver	dgbdriver = {
 
 static	d_open_t	dgbopen;
 static	d_close_t	dgbclose;
-static	d_read_t	dgbread;
-static	d_write_t	dgbwrite;
 static	d_ioctl_t	dgbioctl;
 
 #define	CDEV_MAJOR	58
 static struct cdevsw dgb_cdevsw = {
 	/* open */	dgbopen,
 	/* close */	dgbclose,
-	/* read */	dgbread,
-	/* write */	dgbwrite,
+	/* read */	ttyread,
+	/* write */	ttywrite,
 	/* ioctl */	dgbioctl,
 	/* poll */	ttypoll,
 	/* mmap */	nommap,
@@ -1198,55 +1196,7 @@ static void
 dgb_pause(chan)
 	void *chan;
 {
-wakeup((caddr_t)chan);
-}
-
-
-static	int
-dgbread(dev, uio, flag)
-	dev_t		dev;
-	struct uio	*uio;
-	int		flag;
-{
-	int		mynor;
-	struct tty	*tp;
-	int error, unit, pnum;
-
-	mynor=minor(dev);
-	if (mynor & CONTROL_MASK)
-		return (ENODEV);
-	unit=MINOR_TO_UNIT(mynor);
-	pnum=MINOR_TO_PORT(mynor);
-
-	tp=&dgb_softc[unit].ttys[pnum];
-
-	error=linesw[tp->t_line].l_read(tp, uio, flag);
-	DPRINT4(DB_RD,"dgb%d: port%d: read() returns %d\n",unit,pnum,error);
-	return error;
-}
-
-static	int
-dgbwrite(dev, uio, flag)
-	dev_t		dev;
-	struct uio	*uio;
-	int		flag;
-{
-	int		mynor;
-	struct tty	*tp;
-	int error, unit, pnum;
-
-	mynor=minor(dev);
-	if (mynor & CONTROL_MASK)
-		return (ENODEV);
-
-	unit=MINOR_TO_UNIT(mynor);
-	pnum=MINOR_TO_PORT(mynor);
-
-	tp=&dgb_softc[unit].ttys[pnum];
-
-	error=linesw[tp->t_line].l_write(tp, uio, flag);
-	DPRINT4(DB_WR,"dgb%d: port%d: write() returns %d\n",unit,pnum,error);
-	return error;
+	wakeup((caddr_t)chan);
 }
 
 static void
diff --git a/sys/gnu/i386/isa/dgm.c b/sys/gnu/i386/isa/dgm.c
index 4a2ec53..3732302 100644
--- a/sys/gnu/i386/isa/dgm.c
+++ b/sys/gnu/i386/isa/dgm.c
@@ -208,16 +208,14 @@ struct isa_driver	dgmdriver = {
 
 static	d_open_t	dgmopen;
 static	d_close_t	dgmclose;
-static	d_read_t	dgmread;
-static	d_write_t	dgmwrite;
 static	d_ioctl_t	dgmioctl;
 
 #define	CDEV_MAJOR	101
 static struct cdevsw dgm_cdevsw = {
 	/* open */	dgmopen,
 	/* close */	dgmclose,
-	/* read */	dgmread,
-	/* write */	dgmwrite,
+	/* read */	ttyread,
+	/* write */	ttywrite,
 	/* ioctl */	dgmioctl,
 	/* poll */	ttypoll,
 	/* mmap */	nommap,
@@ -1005,52 +1003,6 @@ wakeup((caddr_t)chan);
 }
 
 
-static	int
-dgmread(dev, uio, flag)
-	dev_t		dev;
-	struct uio	*uio;
-	int		flag;
-{
-	int		mynor;
-	struct tty	*tp;
-	int error, unit, pnum;
-
-	mynor=minor(dev);
-	if (mynor & CONTROL_MASK)
-		return (ENODEV);
-	unit=MINOR_TO_UNIT(mynor);
-	pnum=MINOR_TO_PORT(mynor);
-
-	tp=&dgm_softc[unit].ttys[pnum];
-	error=linesw[tp->t_line].l_read(tp, uio, flag);
-	DPRINT4(DB_RD,"dgm%d: port%d: read() returns %d\n",unit,pnum,error);
-	return error;
-}
-
-static	int
-dgmwrite(dev, uio, flag)
-	dev_t		dev;
-	struct uio	*uio;
-	int		flag;
-{
-	int		mynor;
-	struct tty	*tp;
-	int error, unit, pnum;
-
-	mynor=minor(dev);
-	if (mynor & CONTROL_MASK)
-		return (ENODEV);
-
-	unit=MINOR_TO_UNIT(mynor);
-	pnum=MINOR_TO_PORT(mynor);
-
-	tp=&dgm_softc[unit].ttys[pnum];
-
-	error=linesw[tp->t_line].l_write(tp, uio, flag);
-	DPRINT4(DB_WR,"dgm%d: port%d: write() returns %d\n",unit,pnum,error);
-	return error;
-}
-
 static void
 dgmpoll(unit_c)
 	void *unit_c;
diff --git a/sys/i386/isa/cx.c b/sys/i386/isa/cx.c
index 1eeb42e..9240be5 100644
--- a/sys/i386/isa/cx.c
+++ b/sys/i386/isa/cx.c
@@ -85,8 +85,6 @@ static struct tty cx_tty [NCX*NCHAN];          /* tty data */
 
 static	d_open_t	cxopen;
 static	d_close_t	cxclose;
-static	d_read_t	cxread;
-static	d_write_t	cxwrite;
 static	d_ioctl_t	cxioctl;
 
 #define	CDEV_MAJOR	42
@@ -94,8 +92,8 @@ static	d_ioctl_t	cxioctl;
 struct cdevsw cx_cdevsw = {
 	/* open */	cxopen,
 	/* close */	cxclose,
-	/* read */	cxread,
-	/* write */	cxwrite,
+	/* read */	ttyread,
+	/* write */	ttywrite,
 	/* ioctl */	cxioctl,
 	/* poll */	ttypoll,
 	/* mmap */	nommap,
@@ -287,28 +285,6 @@ int cxclose (dev_t dev, int flag, int mode, struct proc *p)
 	return (0);
 }
 
-int cxread (dev_t dev, struct uio *uio, int flag)
-{
-	int unit = UNIT (dev);
-	struct tty *tp;
-
-	if (unit == UNIT_CTL)
-		return (EIO);
-	tp = cxchan[unit]->ttyp;
-	return ((*linesw[tp->t_line].l_read) (tp, uio, flag));
-}
-
-int cxwrite (dev_t dev, struct uio *uio, int flag)
-{
-	int unit = UNIT (dev);
-	struct tty *tp;
-
-	if (unit == UNIT_CTL)
-		return (EIO);
-	tp = cxchan[unit]->ttyp;
-	return ((*linesw[tp->t_line].l_write) (tp, uio, flag));
-}
-
 int cxioctl (dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
 {
 	int unit = UNIT (dev);
diff --git a/sys/i386/isa/cy.c b/sys/i386/isa/cy.c
index 472544a..041b4dd 100644
--- a/sys/i386/isa/cy.c
+++ b/sys/i386/isa/cy.c
@@ -132,7 +132,6 @@
 #define	sioopen		cyopen
 #define	siopoll		cypoll
 #define	sioprobe	cyprobe
-#define	sioread		cyread
 #define	siosettimeout	cysettimeout
 #define	siosetwater	cysetwater
 #define	comstop		cystop
@@ -367,7 +366,6 @@ struct isa_driver	siodriver = {
 
 static	d_open_t	sioopen;
 static	d_close_t	sioclose;
-static	d_read_t	sioread;
 static	d_write_t	siowrite;
 static	d_ioctl_t	sioioctl;
 
@@ -375,7 +373,7 @@ static	d_ioctl_t	sioioctl;
 static struct cdevsw sio_cdevsw = {
 	/* open */	sioopen,
 	/* close */	sioclose,
-	/* read */	sioread,
+	/* read */	ttyread,
 	/* write */	siowrite,
 	/* ioctl */	sioioctl,
 	/* poll */	ttypoll,
@@ -940,22 +938,6 @@ comhardclose(com)
 }
 
 static int
-sioread(dev, uio, flag)
-	dev_t		dev;
-	struct uio	*uio;
-	int		flag;
-{
-	int		mynor;
-	struct tty	*tp;
-
-	mynor = minor(dev);
-	if (mynor & CONTROL_MASK)
-		return (ENODEV);
-	tp = com_addr(MINOR_TO_UNIT(mynor))->tp;
-	return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
-}
-
-static int
 siowrite(dev, uio, flag)
 	dev_t		dev;
 	struct uio	*uio;
diff --git a/sys/i386/isa/istallion.c b/sys/i386/isa/istallion.c
index c0c7f9f..88d6149 100644
--- a/sys/i386/isa/istallion.c
+++ b/sys/i386/isa/istallion.c
@@ -1076,11 +1076,9 @@ STATIC int stliclose(dev_t dev, int flag, int mode, struct proc *p)
 	return(0);
 }
 
-/*****************************************************************************/
 
 STATIC int stliread(dev_t dev, struct uio *uiop, int flag)
 {
-	stliport_t	*portp;
 
 #if DEBUG
 	printf("stliread(dev=%s,uiop=%p,flag=%x)\n", devtoname(dev),
@@ -1089,11 +1087,8 @@ STATIC int stliread(dev_t dev, struct uio *uiop, int flag)
 
 	if (minor(dev) & STL_MEMDEV)
 		return(stli_memrw(dev, uiop, flag));
-
-	portp = stli_dev2port(dev);
-	if (portp == (stliport_t *) NULL)
-		return(ENODEV);
-	return((*linesw[portp->tty.t_line].l_read)(&portp->tty, uiop, flag));
+	else
+		return(ttyread(dev, uiop, flag));
 }
 
 /*****************************************************************************/
@@ -1136,11 +1131,8 @@ STATIC int stliwrite(dev_t dev, struct uio *uiop, int flag)
 
 	if (minor(dev) & STL_MEMDEV)
 		return(stli_memrw(dev, uiop, flag));
-
-	portp = stli_dev2port(dev);
-	if (portp == (stliport_t *) NULL)
-		return(ENODEV);
-	return((*linesw[portp->tty.t_line].l_write)(&portp->tty, uiop, flag));
+	else
+		return(ttywrite(dev, uiop, flag));
 }
 
 /*****************************************************************************/
diff --git a/sys/i386/isa/pcvt/pcvt_drv.c b/sys/i386/isa/pcvt/pcvt_drv.c
index 601be1a..1d3936d 100644
--- a/sys/i386/isa/pcvt/pcvt_drv.c
+++ b/sys/i386/isa/pcvt/pcvt_drv.c
@@ -120,8 +120,6 @@ CONS_DRIVER(pc, pccnprobe, pccninit, pccnterm, pccngetc, pccncheckc, pccnputc);
 
 static	d_open_t	pcopen;
 static	d_close_t	pcclose;
-static	d_read_t	pcread;
-static	d_write_t	pcwrite;
 static	d_ioctl_t	pcioctl;
 static	d_mmap_t	pcmmap;
 
@@ -129,8 +127,8 @@ static	d_mmap_t	pcmmap;
 static struct cdevsw pc_cdevsw = {
 	/* open */	pcopen,
 	/* close */	pcclose,
-	/* read */	pcread,
-	/* write */	pcwrite,
+	/* read */	ttyread,
+	/* write */	ttywrite,
 	/* ioctl */	pcioctl,
 	/* poll */	ttypoll,
 	/* mmap */	pcmmap,
@@ -571,28 +569,6 @@ pcclose(Dev_t dev, int flag, int mode, struct proc *p)
 }
 
 int
-pcread(Dev_t dev, struct uio *uio, int flag)
-{
-	register struct tty *tp;
-
-	if((tp = get_pccons(dev)) == NULL)
-		return ENXIO;
-
-	return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
-}
-
-int
-pcwrite(Dev_t dev, struct uio *uio, int flag)
-{
-	register struct tty *tp;
-
-	if((tp = get_pccons(dev)) == NULL)
-		return ENXIO;
-
-	return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
-}
-
-int
 pcioctl(Dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
 {
 	register int error;
diff --git a/sys/i386/isa/rc.c b/sys/i386/isa/rc.c
index 91b735e..f437eec 100644
--- a/sys/i386/isa/rc.c
+++ b/sys/i386/isa/rc.c
@@ -87,16 +87,14 @@ struct isa_driver rcdriver = {
 
 static	d_open_t	rcopen;
 static	d_close_t	rcclose;
-static	d_read_t	rcread;
-static	d_write_t	rcwrite;
 static	d_ioctl_t	rcioctl;
 
 #define	CDEV_MAJOR	63
 static struct cdevsw rc_cdevsw = {
 	/* open */	rcopen,
 	/* close */	rcclose,
-	/* read */	rcread,
-	/* write */	rcwrite,
+	/* read */	ttyread,
+	/* write */	ttywrite,
 	/* ioctl */	rcioctl,
 	/* poll */	ttypoll,
 	/* mmap */	nommap,
@@ -865,30 +863,6 @@ register struct rc_chans *rc;
 	(void) splx(s);
 }
 
-/* Read from line */
-static	int
-rcread(dev, uio, flag)
-	dev_t           dev;
-	struct uio      *uio;
-	int             flag;
-{
-	struct tty *tp = rc_chans[GET_UNIT(dev)].rc_tp;
-
-	return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
-}
-
-/* Write to line */
-static	int
-rcwrite(dev, uio, flag)
-	dev_t           dev;
-	struct uio      *uio;
-	int             flag;
-{
-	struct tty *tp = rc_chans[GET_UNIT(dev)].rc_tp;
-
-	return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
-}
-
 /* Reset the bastard */
 static void rc_hwreset(unit, nec, chipid)
 	register int    unit, nec;
diff --git a/sys/i386/isa/rp.c b/sys/i386/isa/rp.c
index 5a4cceb..bc846d5 100644
--- a/sys/i386/isa/rp.c
+++ b/sys/i386/isa/rp.c
@@ -794,7 +794,6 @@ static	char	driver_name[] = "rp";
 
 static	d_open_t	rpopen;
 static	d_close_t	rpclose;
-static	d_read_t	rpread;
 static	d_write_t	rpwrite;
 static	d_ioctl_t	rpioctl;
 
@@ -802,7 +801,7 @@ static	d_ioctl_t	rpioctl;
 static struct cdevsw rp_cdevsw = {
 	/* open */	rpopen,
 	/* close */	rpclose,
-	/* read */	rpread,
+	/* read */	ttyread,
 	/* write */	rpwrite,
 	/* ioctl */	rpioctl,
 	/* poll */	ttypoll,
@@ -856,9 +855,6 @@ static	int	rpparam __P((struct tty *, struct termios *));
 static	void	rpstart __P((struct tty *));
 static	void	rpstop __P((struct tty *, int));
 static	void	rphardclose	__P((struct rp_port *));
-#define rpmap	nomap
-#define rpreset noreset
-#define rpstrategy	nostrategy
 static	void	rp_disc_optim	__P((struct tty *tp, struct termios *t,
 						struct rp_port	*rp));
 
@@ -1504,30 +1500,6 @@ rphardclose(struct rp_port *rp)
 
 static
 int
-rpread(dev, uio, flag)
-	dev_t	dev;
-	struct	uio	*uio;
-	int	flag;
-{
-	struct	rp_port *rp;
-	struct	tty	*tp;
-	int	unit, mynor, umynor, port, error = 0; /* SG */
-
-   umynor = (((minor(dev) >> 16) -1) * 32);    /* SG */
-	port  = (minor(dev) & 0x1f);                /* SG */
-	mynor = (port + umynor);                    /* SG */
-   unit = minor_to_unit[mynor];                /* SG */
-
-	if(IS_CONTROL(dev))
-		return(ENODEV);
-	rp = rp_addr(unit) + port;
-	tp = rp->rp_tty;
-	error = (*linesw[tp->t_line].l_read)(tp, uio, flag);
-	return(error);
-}
-
-static
-int
 rpwrite(dev, uio, flag)
 	dev_t	dev;
 	struct	uio	*uio;
diff --git a/sys/i386/isa/si.c b/sys/i386/isa/si.c
index 79097ca..1de0aae 100644
--- a/sys/i386/isa/si.c
+++ b/sys/i386/isa/si.c
@@ -169,7 +169,6 @@ DATA_SET(eisadriver_set, si_eisa_driver);
 
 static	d_open_t	siopen;
 static	d_close_t	siclose;
-static	d_read_t	siread;
 static	d_write_t	siwrite;
 static	d_ioctl_t	siioctl;
 
@@ -177,7 +176,7 @@ static	d_ioctl_t	siioctl;
 static struct cdevsw si_cdevsw = {
 	/* open */	siopen,
 	/* close */	siclose,
-	/* read */	siread,
+	/* read */	ttyread,
 	/* write */	siwrite,
 	/* ioctl */	siioctl,
 	/* poll */	ttypoll,
@@ -1389,29 +1388,6 @@ sidtrwakeup(chan)
 	splx(oldspl);
 }
 
-/*
- * User level stuff - read and write
- */
-static	int
-siread(dev, uio, flag)
-	register dev_t dev;
-	struct uio *uio;
-	int flag;
-{
-	register struct tty *tp;
-	int mynor = minor(dev);
-
-	if (IS_SPECIAL(mynor)) {
-		DPRINT((0, DBG_ENTRY|DBG_FAIL|DBG_READ, "siread(CONTROLDEV!!)\n"));
-		return(ENODEV);
-	}
-	tp = MINOR2TP(mynor);
-	DPRINT((TP2PP(tp), DBG_ENTRY|DBG_READ,
-		"siread(%s,%x,%x)\n", devtoname(dev), uio, flag));
-	return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
-}
-
-
 static	int
 siwrite(dev, uio, flag)
 	dev_t dev;
diff --git a/sys/i386/isa/stallion.c b/sys/i386/isa/stallion.c
index 76e9119..4194878 100644
--- a/sys/i386/isa/stallion.c
+++ b/sys/i386/isa/stallion.c
@@ -438,8 +438,6 @@ static int	stlattach(struct isa_device *idp);
 
 STATIC	d_open_t	stlopen;
 STATIC	d_close_t	stlclose;
-STATIC	d_read_t	stlread;
-STATIC	d_write_t	stlwrite;
 STATIC	d_ioctl_t	stlioctl;
 
 /*
@@ -532,8 +530,8 @@ COMPAT_PCI_DRIVER (stlpci, stlpcidriver);
 static struct cdevsw stl_cdevsw = {
 	/* open */	stlopen,
 	/* close */	stlclose,
-	/* read */	stlread,
-	/* write */	stlwrite,
+	/* read */	ttyread,
+	/* write */	ttywrite,
 	/* ioctl */	stlioctl,
 	/* poll */	ttypoll,
 	/* mmap */	nommap,
@@ -898,23 +896,6 @@ STATIC int stlclose(dev_t dev, int flag, int mode, struct proc *p)
 
 /*****************************************************************************/
 
-STATIC int stlread(dev_t dev, struct uio *uiop, int flag)
-{
-	stlport_t	*portp;
-
-#if DEBUG
-	printf("stlread(dev=%s,uiop=%p,flag=%x)\n", devtoname(dev),
-		(void *) uiop, flag);
-#endif
-
-	portp = stl_dev2port(dev);
-	if (portp == (stlport_t *) NULL)
-		return(ENODEV);
-	return((*linesw[portp->tty.t_line].l_read)(&portp->tty, uiop, flag));
-}
-
-/*****************************************************************************/
-
 #if VFREEBSD >= 220
 
 STATIC void stl_stop(struct tty *tp, int rw)
@@ -942,23 +923,6 @@ STATIC int stlstop(struct tty *tp, int rw)
 
 /*****************************************************************************/
 
-STATIC int stlwrite(dev_t dev, struct uio *uiop, int flag)
-{
-	stlport_t	*portp;
-
-#if DEBUG
-	printf("stlwrite(dev=%s,uiop=%p,flag=%x)\n", devtoname(dev),
-		(void *) uiop, flag);
-#endif
-
-	portp = stl_dev2port(dev);
-	if (portp == (stlport_t *) NULL)
-		return(ENODEV);
-	return((*linesw[portp->tty.t_line].l_write)(&portp->tty, uiop, flag));
-}
-
-/*****************************************************************************/
-
 STATIC int stlioctl(dev_t dev, unsigned long cmd, caddr_t data, int flag,
 		    struct proc *p)
 {
diff --git a/sys/kern/tty.c b/sys/kern/tty.c
index e014e31..f311f76 100644
--- a/sys/kern/tty.c
+++ b/sys/kern/tty.c
@@ -2440,5 +2440,34 @@ nottystop(tp, rw)
 	struct tty *tp;
 	int rw;
 {
+
 	return;
 }
+
+int
+ttyread(dev, uio, flag)
+	dev_t dev;
+	struct uio *uio;
+	int flag;
+{
+	struct tty *tp;
+
+	tp = dev->si_tty;
+	if (tp == NULL)
+		return (ENODEV);
+	return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
+}
+
+int
+ttywrite(dev, uio, flag)
+	dev_t dev;
+	struct uio *uio;
+	int flag;
+{
+	struct tty *tp;
+
+	tp = dev->si_tty;
+	if (tp == NULL)
+		return (ENODEV);
+	return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
+}
diff --git a/sys/pc98/pc98/syscons.c b/sys/pc98/pc98/syscons.c
index 1e6f4e6..b3e2123 100644
--- a/sys/pc98/pc98/syscons.c
+++ b/sys/pc98/pc98/syscons.c
@@ -204,7 +204,6 @@ CONS_DRIVER(sc, sccnprobe, sccninit, sccnterm, sccngetc, sccncheckc, sccnputc);
 static	d_open_t	scopen;
 static	d_close_t	scclose;
 static	d_read_t	scread;
-static	d_write_t	scwrite;
 static	d_ioctl_t	scioctl;
 static	d_mmap_t	scmmap;
 
@@ -212,7 +211,7 @@ static struct cdevsw sc_cdevsw = {
 	/* open */	scopen,
 	/* close */	scclose,
 	/* read */	scread,
-	/* write */	scwrite,
+	/* write */	ttywrite,
 	/* ioctl */	scioctl,
 	/* poll */	ttypoll,
 	/* mmap */	scmmap,
@@ -574,18 +573,9 @@ scclose(dev_t dev, int flag, int mode, struct proc *p)
 int
 scread(dev_t dev, struct uio *uio, int flag)
 {
-    struct tty *tp = dev->si_tty;
 
     sc_touch_scrn_saver();
-    return((*linesw[tp->t_line].l_read)(tp, uio, flag));
-}
-
-int
-scwrite(dev_t dev, struct uio *uio, int flag)
-{
-    struct tty *tp = dev->si_tty;
-
-    return((*linesw[tp->t_line].l_write)(tp, uio, flag));
+    return(ttyread(dev, uio, flag));
 }
 
 static int
diff --git a/sys/sys/tty.h b/sys/sys/tty.h
index 083ea2a..42ee9da 100644
--- a/sys/sys/tty.h
+++ b/sys/sys/tty.h
@@ -265,10 +265,12 @@ int	 ttyinput __P((int c, struct tty *tp));
 int	 ttylclose __P((struct tty *tp, int flag));
 int	 ttymodem __P((struct tty *tp, int flag));
 int	 ttyopen __P((dev_t device, struct tty *tp));
+int	 ttyread __P((dev_t dev, struct uio *uio, int flag));
 void	 ttyregister __P((struct tty *tp));
 int	 ttysleep __P((struct tty *tp,
 	    void *chan, int pri, char *wmesg, int timeout));
 int	 ttywait __P((struct tty *tp));
+int	 ttywrite __P((dev_t dev, struct uio *uio, int flag));
 struct tty *ttymalloc __P((struct tty *tp));
 void     ttyfree __P((struct tty *));