FAS 2.07 async driver, part 2/3

Uwe Doering gemini at geminix.in-berlin.de
Wed Sep 19 05:14:08 AEST 1990


#!/bin/sh
# this is fas207.02 (part 2 of a multipart archive)
# do not concatenate these parts, unpack them in order with /bin/sh
# file fas.c continued
#
if test ! -r _shar_seq_.tmp; then
	echo 'Please unpack part 1 first!'
	exit 1
fi
(read Scheck
 if test "$Scheck" != 2; then
	echo Please unpack part "$Scheck" next!
	exit 1
 else
	exit 0
 fi
) < _shar_seq_.tmp || exit 1
if test ! -f _shar_wnt_.tmp; then
	echo 'x - still skipping fas.c'
else
echo 'x - continuing file fas.c'
sed 's/^X//' << 'SHAR_EOF' >> 'fas.c' &&
X{
X%reg	val;
X	movl	val,%eax
X%mem	val;
X	movb	val,%al
X}
X
Xasm	void loaddx (val)
X{
X%reg	val;
X	movl	val,%edx
X%mem	val;
X	movw	val,%dx
X}
X
Xasm	void outbyte ()
X{
X	outb	(%dx)
X}
X
Xasm	int inbyte ()
X{
X	xorl	%eax,%eax
X	inb	(%dx)
X}
X
X/* The port parameter of the `outb' macro must be one of the predefined
X   port macros from `fas.h' or a simple uint variable (no indirection
X   is allowed). Additionally, `fip' must be a register variable in the
X   functions where `outb' is used. This prevents the destruction of the
X   `eax' CPU register while loading the `edx' register with the port
X   address. This is highly compiler implementation specific.
X*/
X#define outb(port,val) (regvar = (val), loadal (regvar), regvar = (port), loaddx (regvar), outbyte ())
X
X#define inb(port) (regvar = (port), loaddx (regvar), inbyte ())
X
X#define REGVAR register uint	regvar
X
X/* This function inserts the address optimization assembler pseudo-op
X   wherever called.
X*/
X
Xasm	void optim ()
X{
X	.optim
X}
X
X/* This dummy function has nothing to do but to call optim so that
X   the `.optim' assembler pseudo-op will be included in the assembler
X   file. This must be the first of all functions.
X*/
X
X#if defined (OPTIM)	/* Define for uPort, ISC doesn't know about */
Xstatic void		/* `.optim', but has turned on optimization by */
Xdummy ()		/* default, so we don't need it there anyway. */
X{
X	optim ();
X}
X#endif
X#endif	/* XENIX */
X
X/* functions provided by this driver */
Xint		fasinit ();
Xint		fasopen ();
Xint		fasclose ();
Xint		fasread ();
Xint		faswrite ();
Xint		fasioctl ();
Xint		fasintr ();
X#if defined (NEED_PUT_GETCHAR)
Xint		asyputchar ();
Xint		asygetchar ();
X#endif
X#if defined (NEED_INIT8250)
Xint		init8250 ();
X#endif
Xstatic int	fas_proc ();
Xstatic void	fas_param ();
Xstatic void	fas_fproc ();
Xstatic void	fas_mproc ();
Xstatic uint	fas_rproc ();
Xstatic void	fas_xproc ();
Xstatic void	fas_event ();
X#if defined (HAVE_VPIX)
Xstatic int	fas_vpix_sr ();
X#endif
Xstatic void	fas_rxfer ();
Xstatic void	fas_xxfer ();
Xstatic void	fas_ihlw_check ();
Xstatic void	fas_hangup ();
Xstatic void	fas_timeout ();
Xstatic void	fas_cmd ();
Xstatic void	fas_open_device ();
Xstatic void	fas_close_device ();
Xstatic int	fas_test_device ();
X
X/* functions used by this driver */
Xextern int	ttinit ();
Xextern int	ttiocom ();
Xextern int	ttyflush ();
Xextern int	SPLINT ();
Xextern int	SPLWRK ();
Xextern int	splx ();
Xextern int	sleep ();
Xextern int	wakeup ();
Xextern int	signal ();
Xextern int	timeout ();
Xextern int	untimeout ();
X#if defined (SCO)
Xextern int	printcfg ();
X#else
Xextern int	printf ();
X#endif
X#if defined (HAVE_VPIX)
Xextern int	ttywait ();
Xextern int	fubyte ();
Xextern int	subyte ();
Xextern int	v86setint ();
X#endif
X#if defined (XENIX)
Xextern int	inb ();
Xextern void	outb ();
X#endif
X
X/* the following stuff is defined in space.c */
Xextern uint	fas_physical_units;
Xextern uint	fas_port [];
Xextern uint	fas_vec [];
Xextern uint	fas_init_seq [];
Xextern uint	fas_mcb [];
Xextern uint	fas_modem [];
Xextern uint	fas_flow [];
Xextern uint	fas_int_ack_port [];
Xextern uint	fas_int_ack [];
Xextern uint	fas_mux_ack_port [];
Xextern uint	fas_mux_ack [];
Xextern struct fas_info	fas_info [];
Xextern struct tty	fas_tty [];
Xextern struct fas_info	*fas_info_ptr [];
Xextern struct tty	*fas_tty_ptr [];
X/* end of space.c references */
X
X/* fas_is_initted
X   Flag to indicate that we have been thru init.
X   This is realy only necessary for systems that use asyputchar
X   and asygetchar but it doesn't hurt to have it anyway.
X*/
Xstatic int	fas_is_initted = FALSE;
X
X/* array of pointers to the first fas_info structure for each
X   interrupt vector
X*/
Xstatic struct fas_info	*fas_first_int_user [NUM_INT_VECTORS];
X
X/* the values for the various baud rates */
Xstatic uint	fas_speeds [CBAUD + 1] =
X{	1,			BAUD_BASE/50,
X	BAUD_BASE/75,		BAUD_BASE/110,
X	(2*BAUD_BASE+134)/269,	BAUD_BASE/150,
X	BAUD_BASE/200,		BAUD_BASE/300,
X	BAUD_BASE/600,		BAUD_BASE/1200,
X	BAUD_BASE/1800,		BAUD_BASE/2400,
X	BAUD_BASE/4800,		BAUD_BASE/9600,
X	BAUD_BASE/19200,	BAUD_BASE/38400
X};
X
X/* time for one character to completely leave the transmitter shift register */
Xstatic uint	fas_ctimes [CBAUD + 1] =
X{	1,		HZ*15/50+2,
X	HZ*15/75+2,	HZ*15/110+2,
X	HZ*30/269+2,	HZ*15/150+2,
X	HZ*15/200+2,	HZ*15/300+2,
X	HZ*15/600+2,	HZ*15/1200+2,
X	HZ*15/1800+2,	HZ*15/2400+2,
X	HZ*15/4800+2,	HZ*15/9600+2,
X	HZ*15/19200+2,	HZ*15/38400+2
X};
X
X/* dynamically adapt xmit buffer size to baud rate to prevent long buffer
X   drains at low speeds
X   These values are checked against boundaries and will be modified if
X   necessary before use. Checking is done in fas_param (). Drain time
X   is about 5 seconds with continuous character flow.
X*/
Xstatic uint	fas_xbuf_size [CBAUD + 1] =
X{	1,		50/2,
X	75/2,		110/2,
X	269/4,		150/2,
X	200/2,		300/2,
X	600/2,		1200/2,
X	1800/2,		2400/2,
X	4800/2,		9600/2,
X	19200/2,	38400/2
X};
X
X/* lookup table for minor device number -> open mode flags translation */
Xstatic uint	fas_open_modes [16] =
X{
X	OS_OPEN_FOR_DIALOUT | OS_FAKE_CARR_ON | OS_CLOCAL,
X	OS_OPEN_FOR_DIALOUT | OS_FAKE_CARR_ON | OS_CLOCAL | OS_HW_HANDSHAKE,
X	OS_OPEN_FOR_DIALOUT | OS_FAKE_CARR_ON,
X	OS_OPEN_FOR_DIALOUT | OS_FAKE_CARR_ON | OS_HW_HANDSHAKE,
X	OS_OPEN_FOR_DIALOUT | OS_CHECK_CARR_ON_OPEN,
X	OS_OPEN_FOR_DIALOUT | OS_CHECK_CARR_ON_OPEN | OS_HW_HANDSHAKE,
X	OS_OPEN_FOR_DIALOUT | OS_CHECK_CARR_ON_OPEN | OS_FAKE_CARR_ON,
X	OS_OPEN_FOR_DIALOUT | OS_CHECK_CARR_ON_OPEN | OS_FAKE_CARR_ON | OS_HW_HANDSHAKE,
X	OS_OPEN_FOR_GETTY | OS_WAIT_OPEN | OS_NO_DIALOUT,
X	OS_OPEN_FOR_GETTY | OS_WAIT_OPEN | OS_NO_DIALOUT | OS_HW_HANDSHAKE,
X	OS_OPEN_FOR_GETTY | OS_WAIT_OPEN | OS_NO_DIALOUT | OS_UNBLOCK_ENABLE,
X	OS_OPEN_FOR_GETTY | OS_WAIT_OPEN | OS_NO_DIALOUT | OS_UNBLOCK_ENABLE | OS_HW_HANDSHAKE,
X	OS_OPEN_FOR_GETTY | OS_WAIT_OPEN,
X	OS_OPEN_FOR_GETTY | OS_WAIT_OPEN | OS_HW_HANDSHAKE,
X	OS_OPEN_FOR_GETTY | OS_WAIT_OPEN | OS_UNBLOCK_ENABLE,
X	OS_OPEN_FOR_GETTY | OS_WAIT_OPEN | OS_UNBLOCK_ENABLE | OS_HW_HANDSHAKE
X};
X
X/* The following defines are used to take apart the minor device numbers. */
X#define GET_UNIT(dev)		((dev) & 0x0f)
X#define GET_OPEN_MODE(dev)	(fas_open_modes [((dev) >> 4) & 0x0f])
X
X/* lock device against concurrent use */
X#define get_device_lock(fip) \
X{\
X	/* sleep while device is used by an other process */\
X	while ((fip)->device_flags.i & DF_DEVICE_LOCKED)\
X		(void) sleep ((caddr_t) &(fip)->device_flags.i, PZERO - 1);\
X	(fip)->device_flags.s |= DF_DEVICE_LOCKED;\
X}
X
X/* release device */
X#define release_device_lock(fip) \
X{\
X	(fip)->device_flags.s &= ~DF_DEVICE_LOCKED;\
X	/* wakeup the process that may wait for this device */\
X	(void) wakeup ((caddr_t) &(fip)->device_flags.i);\
X}
X
X/* schedule event */
X#define event_sched(fip,event) \
X{\
X	(fip)->event_flags.s |= (event);\
X	if (!((fip)->event_flags.i & EF_EVENT_SCHEDULED))\
X	{\
X		(fip)->event_flags.s |= EF_EVENT_SCHEDULED;\
X		(void) timeout (fas_event, (fip), EVENT_TIME);\
X	}\
X}
X
X/* fasinit
X   This routine checks for the presense of the devices in the fas_port
X   array and if the device is present tests and initializes it.
X   During the initialization if the device is determined to be an
X   NS16550A chip the DF_DEVICE_IS_NS16550 flag is set and the FIFOs will
X   be used. If the device is an i82510 chip the DF_DEVICE_IS_I82510 flag
X   is set and the device will be handled accordingly.
X*/
X
Xint
Xfasinit ()
X{
X	register struct fas_info	*fip;
X	register uint	unit;
X	uint	logical_units;
X	uint	port, *seq_ptr;
X	char	port_stat [MAX_UNITS + 1];
X	REGVAR;
X
X	if (fas_is_initted)
X		return (0);
X
X	fas_is_initted = TRUE;
X
X	/* execute the init sequence for the serial card */
X	for (seq_ptr = fas_init_seq; *seq_ptr; seq_ptr++)
X	{
X		port = *seq_ptr;
X		seq_ptr++;
X		if (*seq_ptr > 0xff)
X			inb (port);
X		else
X			outb (port, *seq_ptr);
X	}
X
X	/* setup the list of pointers to the tty structures */
X	for (unit = 0, logical_units = fas_physical_units * 2;
X		unit < logical_units; unit++)
X		fas_tty_ptr [unit] = &fas_tty [unit];
X
X	/* setup and initialize all serial ports */
X	for (unit = 0; unit < fas_physical_units; unit++)
X	{
X		fas_info_ptr [unit] = fip = &fas_info [unit];
X		port_stat [unit] = '-';
X		if (port = fas_port [unit])
X		{
X			/* init all of its ports */
X			fip->uart_port_0 = port;
X			fip->uart_port_1 = port + 1;
X			fip->uart_port_2 = port + 2;
X			fip->uart_port_3 = port + 3;
X			fip->uart_port_4 = port + 4;
X			fip->uart_port_5 = port + 5;
X			fip->uart_port_6 = port + 6;
X			fip->int_ack_port = fas_int_ack_port [unit];
X			fip->int_ack = fas_int_ack [unit];
X			fip->vec = fas_vec [unit];
X			fip->modem.i = fas_modem [unit];
X			fip->flow.i = fas_flow [unit];
X			fip->recv_ring_put_ptr = fip->recv_buffer;
X			fip->recv_ring_take_ptr = fip->recv_buffer;
X			fip->xmit_ring_put_ptr = fip->xmit_buffer;
X			fip->xmit_ring_take_ptr = fip->xmit_buffer;
X
X			fip->ier = IE_NONE;	/* disable all ints */
X			outb (INT_ENABLE_PORT, fip->ier);
X
X			/* is there a serial chip ? */
X			if (inb (INT_ENABLE_PORT) != fip->ier)
X			{
X				port_stat [unit] = '?';
X				continue;	/* a hardware error */
X			}
X
X			/* test the chip thoroughly */
X			if ((port_stat [unit] = (fas_test_device (fip) + '0'))
X				!= '0')
X			{
X				continue;	/* a hardware error */
X			}
X
X			fip->lcr = 0;
X			outb (LINE_CTL_PORT, fip->lcr);
X			fip->mcr = fas_mcb [unit];
X			outb (MDM_CTL_PORT, fip->mcr);
X
X			port_stat [unit] = '*';
X
X			/* let's see if it's an NS16550 */
X			outb (NS_FIFO_CTL_PORT, STANDARD_NS_FIFO_INIT);
X			if (!(~inb (INT_ID_PORT) & II_NS_FIFO_ENABLED))
X			{
X				fip->device_flags.s |= DF_DEVICE_IS_NS16550;
X				port_stat [unit] = 'F';
X				outb (NS_FIFO_CTL_PORT, STANDARD_NS_FIFO_CLEAR);
X			}
X			else
X			{
X				outb (NS_FIFO_CTL_PORT, STANDARD_NS_FIFO_CLEAR);
X				/* or is it an i82510 ? */
X				outb (I_BANK_PORT, I_BANK_2);
X				if (!(~inb (I_BANK_PORT) & I_BANK_2))
X				{
X					fip->device_flags.s |= DF_DEVICE_IS_I82510;
X					port_stat [unit] = 'f';
X					outb (I_BANK_PORT, I_BANK_1);
X					outb (I_TCM_PORT, I_FIFO_CLR_XMIT);
X					outb (I_RCM_PORT, I_FIFO_CLR_RECV);
X				}
X				outb (I_BANK_PORT, I_BANK_0);
X			}
X
X			/* clear potential interrupts */
X			inb (MDM_STATUS_PORT);
X			inb (RCV_DATA_PORT);
X			inb (RCV_DATA_PORT);
X			inb (LINE_STATUS_PORT);
X			inb (INT_ID_PORT);
X			if (INT_ACK_PORT)
X				outb (INT_ACK_PORT, fip->int_ack);
X			if (port = fas_mux_ack_port [fip->vec])
X				outb (port, fas_mux_ack [fip->vec]);
X
X			/* show that it is present and configured */
X			fip->device_flags.s |= DF_DEVICE_CONFIGURED;
X		}
X	}
X
X#if defined (NEED_PUT_GETCHAR)
X	fip = &fas_info [0];
X	fip->mcr |= INITIAL_MDM_CONTROL;
X	outb (MDM_CTL_PORT, fip->mcr);
X
X	fip->lcr = INITIAL_LINE_CONTROL;
X	outb (LINE_CTL_PORT, fip->lcr | LC_ENABLE_DIVISOR);
X	outb (DIVISOR_LSB_PORT, INITIAL_BAUD_RATE);
X	outb (DIVISOR_MSB_PORT, (INITIAL_BAUD_RATE) >> 8);
X	outb (LINE_CTL_PORT, fip->lcr);
X#endif
X
X#if defined (SCO)
X	for (unit = 0; unit < fas_physical_units; unit++)
X		(void) printcfg ("fas", fas_port [unit], 7, fas_vec [unit], -1,
X					"unit=%d type=%c release=2.07.0",
X					unit, port_stat [unit]);
X#else
X	port_stat [unit] = '\0';
X	(void) printf ("\nFAS 2.07.0 async driver: Port 0-%d init state is [%s]\n\n",
X			unit - 1,
X			port_stat);
X#endif
X	return (0);
X}
X
X/* Open a tty line. This function is called for every open, as opposed
X   to the fasclose function which is called only with the last close.
X*/
Xint
Xfasopen (dev, flag)
Xint	dev;
Xint	flag;
X{
X	register struct fas_info	*fip;
X	register struct tty		*ttyp;
X	register uint	open_mode;
X	uint	physical_unit;
X	int	old_level;
X
X	physical_unit = GET_UNIT (dev);
X
X	/* check for valid port number */
X	if (physical_unit >= fas_physical_units)
X	{
X		u.u_error = ENXIO;
X		return (-1);
X	}
X
X	fip = fas_info_ptr [physical_unit];
X
X	/* was the port present at init time ? */
X	if (!(fip->device_flags.i & DF_DEVICE_CONFIGURED))
X	{
X		u.u_error = ENXIO;
X		return (-1);
X	}
X
X	open_mode = GET_OPEN_MODE (dev);
X
X	old_level = SPLINT ();
X	get_device_lock (fip);
X
X	/* If this is a getty open, the device is already open for
X           dialout and the FNDELAY flag is not set, wait until device
X           is closed.
X	*/
X	while ((open_mode & OS_OPEN_FOR_GETTY)
X			&& (fip->o_state & OS_OPEN_FOR_DIALOUT)
X			&& !(flag & FNDELAY))
X	{
X		release_device_lock (fip);
X		(void) sleep ((caddr_t) &fip->o_state, TTIPRI);
X		get_device_lock (fip);
X	}
X	
X	/* If the device is already open and another open uses a different
X	   open mode or if a getty open waits for carrier and doesn't allow
X	   parallel dialout opens, return with EBUSY error.
X	*/
X	if ((fip->o_state & ((open_mode & OS_OPEN_FOR_GETTY)
X				? (OS_OPEN_STATES | OS_WAIT_OPEN)
X				: (OS_OPEN_STATES | OS_NO_DIALOUT)))
X		&& ((flag & FEXCL)
X			|| ((open_mode ^ fip->o_state) & (u.u_uid
X						? OS_TEST_MASK
X						: OS_SU_TEST_MASK))))
X	{
X		u.u_error = EBUSY;
X		release_device_lock (fip);
X		(void) splx (old_level);
X		return (-1);
X	}
X
X	/* disable subsequent opens */
X	if (flag & FEXCL)
X		open_mode |= OS_EXCLUSIVE_OPEN_1;
X
X	/* set up pointer to tty structure */
X	ttyp = (open_mode & OS_OPEN_FOR_GETTY)
X		? fas_tty_ptr [physical_unit + fas_physical_units]
X		: fas_tty_ptr [physical_unit];
X
X	/* things to do on first open only */
X	if (!(fip->o_state & ((open_mode & OS_OPEN_FOR_GETTY)
X				? (OS_OPEN_STATES | OS_WAIT_OPEN)
X				: OS_OPEN_STATES)))
X	{
X		/* init data structures */
X		fip->tty = ttyp;
X		(void) ttinit (ttyp);
X		ttyp->t_proc = fas_proc;
X		fip->po_state = fip->o_state;
X		fip->o_state = open_mode & ~OS_OPEN_STATES;
X#if defined (HAVE_VPIX)
X		/* initialize VP/ix related variables */
X		fip->v86_proc = (v86_t *) NULL;
X		fip->v86_intmask = 0;
X		fip->v86_ss.ss_start = CSTART;
X		fip->v86_ss.ss_stop = CSTOP;
X#endif
X		/* open physical device if not yet open */
X		if (!(fip->device_flags.i & DF_DEVICE_OPEN))
X			fas_open_device (fip);
X		fas_param (fip);	/* set up port registers */
X		fas_mproc (fip);	/* set up modem status flags */
X
X		/* allow pending tty interrupts */
X		(void) SPLWRK ();
X		(void) SPLINT ();
X	}
X
X	/* If getty open and the FNDELAY flag is not set,
X	   block and wait for carrier if device not yet open.
X	*/
X	if ((open_mode & OS_OPEN_FOR_GETTY) && !(flag & FNDELAY))
X	{
X		/* sleep while open for dialout or no carrier */
X		while ((fip->o_state & OS_OPEN_FOR_DIALOUT)
X			|| !(ttyp->t_state & (ISOPEN | CARR_ON)))
X		{
X			ttyp->t_state |= WOPEN;
X			release_device_lock (fip);
X			(void) sleep ((caddr_t) &ttyp->t_canq, TTIPRI);
X			get_device_lock (fip);
X		}
X		ttyp->t_state &= ~WOPEN;
X	}
X
X	/* wakeup processes that are still sleeping in getty open */
X	if (ttyp->t_state & WOPEN)
X		(void) wakeup ((caddr_t) &ttyp->t_canq);
X
X	/* we need to flush the receiver with the first open */
X	if (!(fip->o_state & OS_OPEN_STATES))
X		fas_cmd (fip, ttyp, T_RFLUSH);
X
X	(*linesw [ttyp->t_line].l_open) (ttyp);
X
X	/* set open type flags */
X	fip->o_state = open_mode;
X
X	if ((open_mode & OS_CHECK_CARR_ON_OPEN)
X		&& (~fip->msr & fip->modem.m.ca)
X		&& !(fip->cflag & CLOCAL))
X	{
X		(void) SPLWRK ();
X		(void) signal (ttyp->t_pgrp, SIGHUP);
X		(void) ttyflush (ttyp, FREAD | FWRITE);
X		(void) SPLINT ();
X	}
X
X	release_device_lock (fip);
X	(void) splx (old_level);
X	return (0);
X}
X
X/* Close a tty line. This is only called if there is no other
X   concurrent open left. A blocked getty open is not counted as
X   a concurrent open because in this state it isn't really open.
X*/
Xint
Xfasclose (dev)
Xint	dev;
X{
X	register struct fas_info	*fip;
X	register struct tty		*ttyp;
X	uint	open_mode;
X	uint	physical_unit;
X	int	old_level;
X
X	physical_unit = GET_UNIT (dev);
X
X	fip = fas_info_ptr [physical_unit];
X
X	open_mode = GET_OPEN_MODE (dev);
X
X	/* set up pointer to tty structure */
X	ttyp = (open_mode & OS_OPEN_FOR_GETTY)
X		? fas_tty_ptr [physical_unit + fas_physical_units]
X		: fas_tty_ptr [physical_unit];
X	
X	old_level = SPLINT ();
X
X	(*linesw [ttyp->t_line].l_close) (ttyp);
X
X	get_device_lock (fip);
X
X	/* allow pending tty interrupts */
X	(void) SPLWRK ();
X	(void) SPLINT ();
X
X	if (open_mode & OS_OPEN_FOR_GETTY)
X	{
X		/* not waiting any more */
X		ttyp->t_state &= ~WOPEN;
X		if (!(fip->o_state & OS_OPEN_FOR_DIALOUT))
X		{
X			fas_close_device (fip);
X			fip->o_state = OS_DEVICE_CLOSED;
X		}
X		else
X			fip->po_state = OS_DEVICE_CLOSED;
X	}
X	else
X	{
X		fas_close_device (fip);
X		fip->o_state = OS_DEVICE_CLOSED;
X		/* If there is a waiting getty open on
X		   this port, reopen the physical device.
X		*/
X		if (fip->po_state & OS_WAIT_OPEN)
X		{
X			/* get the getty version of the
X			   tty structure
X			*/
X			fip->tty = fas_tty_ptr [physical_unit
X					+ fas_physical_units];
X			fip->o_state = fip->po_state;
X			fip->po_state = OS_DEVICE_CLOSED;
X#if defined (HAVE_VPIX)
X			/* initialize VP/ix related variables */
X			fip->v86_proc = (v86_t *) NULL;
X			fip->v86_intmask = 0;
X			fip->v86_ss.ss_start = CSTART;
X			fip->v86_ss.ss_stop = CSTOP;
X#endif
X			if (!(fip->device_flags.i & DF_DO_HANGUP))
X			{
X				fas_open_device (fip);
X				/* set up port registers */
X				fas_param (fip);
X				/* set up modem status flags */
X				fas_mproc (fip);
X			}
X		}
X		(void) wakeup ((caddr_t) &fip->o_state);
X	}
X
X	if (!(fip->device_flags.i & DF_DO_HANGUP))
X		release_device_lock (fip);
X
X	(void) splx (old_level);
X	return (0);
X}
X
X/* read characters from the input buffer */
Xint
Xfasread (dev)
Xint	dev;
X{
X	register struct fas_info	*fip;
X	register struct tty	*ttyp;
X	int	old_level;
X
X	fip = fas_info_ptr [GET_UNIT (dev)];
X
X	ttyp = fip->tty;
X
X	(*linesw [ttyp->t_line].l_read) (ttyp);
X
X	old_level = SPLINT ();
X
X#if defined (HAVE_VPIX)
X	/* wakeup VP/ix */
X	if ((fip->iflag & DOSMODE) && ttyp->t_rawq.c_cc)
X		event_sched (fip, EF_SIGNAL_VPIX);
X#endif
X	/* schedule character transfer to UNIX buffer */
X	if (fip->recv_ring_cnt
X#if defined (HAVE_VPIX)
X		&& (((fip->iflag & DOSMODE)
X			? MAX_VPIX_FILL - MIN_READ_CHUNK
X			: MAX_UNIX_FILL - MIN_READ_CHUNK)
X				>= fip->tty->t_rawq.c_cc)
X#else
X		&& ((MAX_UNIX_FILL - MIN_READ_CHUNK) >= fip->tty->t_rawq.c_cc)
X#endif
X		&& !(fip->flow_flags.i & FF_RXFER_STOPPED))
X	{
X		event_sched (fip, EF_DO_RXFER);
X	}
X
X	(void) splx (old_level);
X	return (0);
X}
X
X/* write characters to the output buffer */
Xint
Xfaswrite (dev)
Xint	dev;
X{
X	register struct tty	*ttyp;
X
X	ttyp = fas_info_ptr [GET_UNIT (dev)]->tty;
X	(*linesw [ttyp->t_line].l_write) (ttyp);
X	return (0);
X}
X
X/* process ioctl calls */
Xint
Xfasioctl (dev, cmd, arg3, arg4)
Xint	dev;
Xint	cmd;
Xunion ioctl_arg	arg3;
Xint	arg4;
X{
X	register struct fas_info	*fip;
X	register struct tty	*ttyp;
X	int	v86_cmd, v86_data;
X	int	old_level;
X	REGVAR;
X
X	fip = fas_info_ptr [GET_UNIT (dev)];
X
X	ttyp = fip->tty;
X
X	/* process ioctl commands */
X	switch (cmd)
X	{
X#if defined (HAVE_VPIX)
X		case AIOCINTTYPE:	/* set pseudorupt type */
X			switch (arg3.iarg)
X			{
X				case V86VI_KBD:
X				case V86VI_SERIAL0:
X				case V86VI_SERIAL1:
X					intr_disable ();
X					fip->v86_intmask = arg3.iarg;
X					intr_restore ();
X					break;
X
X				default:
X					intr_disable ();
X					fip->v86_intmask = V86VI_SERIAL0;
X					intr_restore ();
X					break;
X			}
X			break;
X
X		case AIOCDOSMODE:	/* enable dos mode */
X			if (!(fip->iflag & DOSMODE))
X			{
X				old_level = SPLINT ();
X				fip->v86_proc = u.u_procp->p_v86;
X				if (!(fip->v86_intmask))
X					fip->v86_intmask = V86VI_SERIAL0;
X				ttyp->t_iflag |= DOSMODE;
X				if (fip->v86_intmask != V86VI_KBD)
X					ttyp->t_cflag |= CLOCAL;
X				fas_param (fip);
X				(void) splx (old_level);
X			}
X			u.u_r.r_reg.r_val1 = 0;
X			break;
X
X		case AIOCNONDOSMODE:	/* disable dos mode */
X			if (fip->iflag & DOSMODE)
X			{
X				old_level = SPLINT ();
X				fip->v86_proc = (v86_t *) NULL;
X				fip->v86_intmask = 0;
X				ttyp->t_iflag &= ~DOSMODE;
X				if (fip->flow_flags.i & FF_RXFER_STOPPED)
X				{
X					fip->flow_flags.s &= ~FF_RXFER_STOPPED;
X					/* schedule character transfer
X					   to UNIX buffer
X					*/
X					if (fip->recv_ring_cnt)
X						event_sched (fip, EF_DO_RXFER);
X				}
X				fip->lcr &= ~LC_SET_BREAK_LEVEL;
X				fas_param (fip);
X				(void) splx (old_level);
X			}
X			u.u_r.r_reg.r_val1 = 0;
X			break;
X
X		case AIOCSERIALOUT:	/* setup port registers for dos */
X			if ((fip->iflag & DOSMODE) && fip->v86_proc)
X			{
X				/* wait until output is done */
X				(void) ttywait (ttyp);
X
X				/* block transmitter and wait until it is
X				   empty
X				*/
X				old_level = SPLINT ();
X				fip->device_flags.s |= DF_XMIT_LOCKED;
X				while (fip->device_flags.i & (DF_XMIT_BUSY
X							| DF_GUARD_TIMEOUT))
X					(void) sleep ((caddr_t) &(fip)->
X								device_flags.i,
X							PZERO - 1);
X				(void) splx (old_level);
X
X				/* get port write command */
X				v86_cmd = fubyte (arg3.cparg);
X				/* set divisor lsb requested */
X				if (v86_cmd & SIO_MASK(SO_DIVLLSB))
X				{
X					v86_data = fubyte (arg3.cparg
X								+ SO_DIVLLSB);
X					intr_disable ();
X					outb (LINE_CTL_PORT, fip->lcr
X							| LC_ENABLE_DIVISOR);
X					outb (DIVISOR_LSB_PORT, v86_data);
X					outb (LINE_CTL_PORT, fip->lcr
X							& ~LC_ENABLE_DIVISOR);
X					intr_restore ();
X				}
X				/* set divisor msb requested */
X				if (v86_cmd & SIO_MASK(SO_DIVLMSB))
X				{
X					v86_data = fubyte (arg3.cparg
X								+ SO_DIVLMSB);
X					intr_disable ();
X					outb (LINE_CTL_PORT, fip->lcr
X							| LC_ENABLE_DIVISOR);
X					outb (DIVISOR_MSB_PORT, v86_data);
X					outb (LINE_CTL_PORT, fip->lcr
X							& ~LC_ENABLE_DIVISOR);
X					intr_restore ();
X				}
X				/* set lcr requested */
X				if (v86_cmd & SIO_MASK(SO_LCR))
X				{
X					v86_data = fubyte (arg3.cparg + SO_LCR);
X					intr_disable ();
X					fip->lcr = v86_data
X							& ~LC_ENABLE_DIVISOR;
X					outb (LINE_CTL_PORT, fip->lcr);
X					intr_restore ();
X				}
X				/* set mcr requested */
X				if (v86_cmd & SIO_MASK(SO_MCR))
X				{
X					v86_data = fubyte (arg3.cparg + SO_MCR);
X					old_level = SPLINT ();
X					/* virtual dtr processing */
X					if (v86_data & MC_SET_DTR)
X					{
X						fip->device_flags.s
X							|= DF_MODEM_ENABLED;
X						fip->mcr |= fip->modem.m.en;
X					}
X					else
X					{
X						fip->device_flags.s
X							&= ~DF_MODEM_ENABLED;
X						fip->mcr &= ~fip->modem.m.en;
X					}
X					/* virtual rts processing */
X					if (!(fip->flow_flags.i
X							& FF_HWI_HANDSHAKE))
X					{
X						if (v86_data & MC_SET_RTS)
X						{
X							fip->flow_flags.s
X							  &= ~FF_HWI_STOPPED;
X							fip->mcr
X							  |= fip->flow.m.ic;
X						}
X						else
X						{
X							fip->flow_flags.s
X							  |= FF_HWI_STOPPED;
X							fip->mcr
X							  &= ~fip->flow.m.ic;
X						}
X					}
X					else
X					{
X					  if (v86_data & MC_SET_RTS)
X					  {
X						if (fip->flow_flags.i
X							& FF_RXFER_STOPPED)
X						{
X						  fip->flow_flags.s
X							&= ~FF_RXFER_STOPPED;
X						  /* schedule character transfer
X						     to UNIX buffer
X						  */
X						  if (fip->recv_ring_cnt)
X							event_sched (fip,
X								EF_DO_RXFER);
X						}
X					  }
X					  else
X						fip->flow_flags.s
X							|= FF_RXFER_STOPPED;
X					}
X					outb (MDM_CTL_PORT, fip->mcr);
X					(void) splx (old_level);
X				}
X
X				old_level = SPLINT ();
X				/* enable transmitter and restart output */
X				fip->device_flags.s &= ~DF_XMIT_LOCKED;
X				fas_xproc (fip);
X				(void) splx (old_level);
X			}
X			break;
X
X		case AIOCSERIALIN:	/* read port registers for dos */
X			if ((fip->iflag & DOSMODE) && fip->v86_proc)
X			{
X				v86_cmd = fubyte (arg3.cparg);
X				if (v86_cmd & SIO_MASK(SI_MSR))
X				{
X					(void) subyte (arg3.cparg + SI_MSR,
X								fip->msr);
X				}
X			}
X			break;
X
X		case AIOCSETSS:	/* set start/stop characters */
X			intr_disable ();
X			*((short *) &fip->v86_ss) = arg3.iarg;
X			intr_restore ();
X			break;
X
X		case AIOCINFO:	/* show what type of device we are */
X			u.u_r.r_reg.r_val1 = ('a' << 8) | (dev & 0xff);
X			break;
X#endif
X		default:	/* default ioctl processing */
X			/* if it is a TCSETA* command, call fas_param () */
X			if (ttiocom (ttyp, cmd, arg3, arg4))
X			{
X				old_level = SPLINT ();
X				fas_param (fip);
X				(void) splx (old_level);
X			}
X			break;
X	}
X	return (0);
X}
X
X/* pass fas commands to the fas multi-function procedure */
Xstatic int
Xfas_proc (ttyp, arg2)
Xstruct tty	*ttyp;
Xint	arg2;
X{
X	register uint	physical_unit;
X	int	old_level;
X
X	physical_unit = ttyp - &fas_tty [0];
X	if (physical_unit >= fas_physical_units)
X		physical_unit -= fas_physical_units;
X
X	old_level = SPLINT ();
X	fas_cmd (fas_info_ptr [physical_unit], ttyp, arg2);
X	(void) splx (old_level);
X	return (0);
X}
X
X/* set up a port according to the given termio structure */
Xstatic void
Xfas_param (fip)
Xregister struct fas_info	*fip;
X{
X	register uint	cflag;
X	uint	divisor;
X	int	xmit_ring_size;
X	REGVAR;
X
X	/* lock transmitter and wait until it is empty */
X	fip->device_flags.s |= DF_XMIT_LOCKED;
X	while (fip->device_flags.i & (DF_XMIT_BUSY | DF_GUARD_TIMEOUT))
X		(void) sleep ((caddr_t) &(fip)->device_flags.i, PZERO - 1);
X
X	cflag = fip->tty->t_cflag;
X
X#if defined (HAVE_VPIX)
X	/* we don't set port registers if we are in dos mode */
X	if (fip->tty->t_iflag & DOSMODE)
X		goto setflags;
X#endif
X	/* hangup line if it is baud rate 0, else enable line */
X	if ((cflag & CBAUD) == B0)
X	{
X		cflag = (cflag & ~CBAUD) | (fip->cflag & CBAUD);
X		fip->mcr &= ~fip->modem.m.en;
X		outb (MDM_CTL_PORT, fip->mcr);
X		fip->device_flags.s &= ~DF_MODEM_ENABLED;
X	}
X	else
X	{
X		if (!(fip->device_flags.i & DF_MODEM_ENABLED))
X		{
X			fip->mcr |= fip->modem.m.en;
X			outb (MDM_CTL_PORT, fip->mcr);
X			fip->device_flags.s |= DF_MODEM_ENABLED;
X		}
X	}
X
X	/* don't change break flag */
X	fip->lcr &= LC_SET_BREAK_LEVEL;
X
X	/* set character size */
X	switch (cflag & CSIZE)
X	{
X	case CS5:
X		fip->lcr |= LC_WORDLEN_5;
X		break;
X
X	case CS6:
X		fip->lcr |= LC_WORDLEN_6;
X		break;
X
X	case CS7:
X		fip->lcr |= LC_WORDLEN_7;
X		break;
X
X	default:
X		fip->lcr |= LC_WORDLEN_8;
X		break;
X	}
X
X	/* set # of stop bits */
X	if (cflag & CSTOPB)
X		fip->lcr |= LC_STOPBITS_LONG;
X
X	/* set parity */
X	if (cflag & PARENB)
X	{
X		fip->lcr |= LC_ENABLE_PARITY;
X
X		if (!(cflag & PARODD))
X			fip->lcr |= LC_EVEN_PARITY;
X	}
X
X	/* get counter divisor for selected baud rate */
X	divisor = fas_speeds [cflag & CBAUD];
X	/* set LCR and baud rate */
X	outb (LINE_CTL_PORT, fip->lcr | LC_ENABLE_DIVISOR);
X	outb (DIVISOR_LSB_PORT, divisor);
X	outb (DIVISOR_MSB_PORT, divisor >> 8);
X	outb (LINE_CTL_PORT, fip->lcr);
X
X	/* check dynamic xmit ring buffer size against boundaries,
X	   modify it if necessary and update the fas_info structure
X	*/
X	xmit_ring_size = fas_xbuf_size [cflag & CBAUD] - TTXOHI;
X	if (xmit_ring_size < OUTPUT_NS_FIFO_SIZE * 2)
X	{
Xsetflags:
X		xmit_ring_size = OUTPUT_NS_FIFO_SIZE * 2;
X	}
X	if (xmit_ring_size > XMIT_BUFF_SIZE)
X		xmit_ring_size = XMIT_BUFF_SIZE;
X	fip->xmit_ring_size = xmit_ring_size;
X
X	/* disable modem control signals if required by open mode */
X	if (fip->o_state & OS_CLOCAL)
X		cflag |= CLOCAL;
X
X	/* Fake the carrier detect state flag if CLOCAL mode or if
X	   requested by open mode.
X	*/
X	if (!(~fip->msr & fip->modem.m.ca)
X		|| (fip->o_state & OS_FAKE_CARR_ON)
X		|| (cflag & CLOCAL))
X		fip->tty->t_state |= CARR_ON;
X	else
X		fip->tty->t_state &= ~CARR_ON;
X
X#if defined (XCLUDE)	/* SYSV 3.2 Xenix compatibility */
X	/* Permit exclusive use of this device. */
X	if (cflag & XCLUDE)
X		fip->o_state |= OS_EXCLUSIVE_OPEN_2;
X	else
X		fip->o_state &= ~OS_EXCLUSIVE_OPEN_2;
X#endif
X
X	/* Select hardware handshake depending on the minor device
X	   number and the CTSFLOW and RTSFLOW flags (if they are
X	   available).
X	*/
X	if (fip->o_state & OS_HW_HANDSHAKE)
X	{
X		fip->flow_flags.s |= FF_HWO_HANDSHAKE | FF_HWI_HANDSHAKE;
X	}
X	else
X	{
X		fip->flow_flags.s &= ~(FF_HWO_HANDSHAKE | FF_HWI_HANDSHAKE);
X#if defined (CTSFLOW)	/* SYSV 3.2 Xenix compatibility */
X		if (cflag & CTSFLOW)
X			fip->flow_flags.s |= FF_HWO_HANDSHAKE;
X#endif
X#if defined (RTSFLOW)	/* SYSV 3.2 Xenix compatibility */
X		if (cflag & RTSFLOW)
X			fip->flow_flags.s |= FF_HWI_HANDSHAKE;
X#endif
X	}
X
X	fip->cflag = cflag;
X	fip->iflag = fip->tty->t_iflag;
X
X	/* enable transmitter */
X	fip->device_flags.s &= ~DF_XMIT_LOCKED;
X
X	/* setup handshake flags */
X	fas_ihlw_check (fip);
X	fas_fproc (fip, fip->new_msr);
X
X	/* restart output */
X	fas_xproc (fip);
X}
X
X/* Main fas interrupt handler. Actual character processing is splitted
X   into sub-functions.
X*/
Xint
Xfasintr (vect)
Xint	vect;
X{
X	register struct fas_info	*fip;
X	register uint	status;
X	int	done;
X	uint	port, old_recv_count;
X	REGVAR;
X
X	/* The 8259 interrupt controller is set up for edge trigger.
X	   Therefor we must loop until we make a complete pass without
X	   getting any UARTs that are interrupting.
X	*/
X	do
X	{
X		done = TRUE;
X		fip = fas_first_int_user [vect];
X
X		/* loop through all users of this interrupt vector */
X		for (;; fip = fip->next_int_user)
X		{
X			if (!fip)
X				break;	/* all users done */
X
X			/* process only ports that we expect ints from
X			   and that actually need to be serviced
X			*/
Xfastloop:
X			if (inb (INT_ID_PORT) & II_NO_INTS_PENDING)
X			{
X				/* speed beats beauty */
X				fip = fip->next_int_user;
X				if (fip)
X					goto fastloop;
X				break;
X			}
X
X			done = FALSE;	/* not done if we got an int */
X			old_recv_count = fip->recv_ring_cnt;
X
X			do
X			{
X				/* read in all the characters from the FIFO */
X				if ((status = inb (LINE_STATUS_PORT))
X					& LS_RCV_INT)
X				{
X					status = fas_rproc (fip, status);
X					sysinfo.rcvint++;
X				}
X
X				/* Is it a transmitter empty int ? */
X				if ((status & LS_XMIT_AVAIL)
X					&& (fip->device_flags.i & DF_XMIT_BUSY))
X				{
X					fip->device_flags.s &= ~DF_XMIT_BUSY;
X					fas_xproc (fip);
X					if (!(fip->device_flags.i & DF_XMIT_BUSY)
X						&& !fip->xmit_ring_cnt)
X					{
X						fip->device_flags.s |=
X							DF_GUARD_TIMEOUT;
X						fip->tty->t_state |=
X							TIMEOUT;
X						fip->timeout_idx =
X							timeout (
X							fas_timeout, fip,
X							fas_ctimes [fip->cflag
X								& CBAUD]);
X					}
X					sysinfo.xmtint++;
X				}
X
X				/* Has there been a polarity change on
X				   some of the modem lines ?
X				*/
X				if ((status = inb (MDM_STATUS_PORT))
X						& MS_ANY_DELTA)
X				{
X					/* Do special RING line handling.
X					   RING generates an int only on the
X					   trailing edge.
X					*/
X					status = (status & ~MS_RING_PRESENT)
X						| (fip->new_msr
X							& MS_RING_PRESENT);
X					if (status & MS_RING_TEDGE)
X						status |= MS_RING_PRESENT;
X					if ((status ^ fip->new_msr)
X							& MS_ANY_PRESENT)
X					{
X						/* check hw flow flags */
X						fas_fproc (fip, status);
X						fip->new_msr = status;
X						event_sched (fip, EF_DO_MPROC);
X					}
X					sysinfo.mdmint++;
X				}
X			} while (!(inb (INT_ID_PORT) & II_NO_INTS_PENDING));
X
X			/* clear the port interrupt */
X			if (INT_ACK_PORT)
X				outb (INT_ACK_PORT, fip->int_ack);
X
X			/* schedule character transfer to UNIX buffer */
X			if (fip->recv_ring_cnt
X#if defined (HAVE_VPIX)
X				&& (((fip->iflag & DOSMODE)
X					? MAX_VPIX_FILL - MIN_READ_CHUNK
X					: MAX_UNIX_FILL - MIN_READ_CHUNK)
X						>= fip->tty->t_rawq.c_cc)
X#else
X				&& ((MAX_UNIX_FILL - MIN_READ_CHUNK)
X						>= fip->tty->t_rawq.c_cc)
X#endif
X				&& !(fip->flow_flags.i & FF_RXFER_STOPPED))
X			{
X				event_sched (fip, EF_DO_RXFER);
X			}
X
X			/* check input buffer high/low water marks */
X			if (fip->recv_ring_cnt != old_recv_count)
X				fas_ihlw_check (fip);
X		}
X	} while (!done);
X
X	/* clear the mux interrupt since we have scanned all
X	   of the ports that share this interrupt vector
X	*/	
X	if (port = fas_mux_ack_port [vect])
X		outb (port, fas_mux_ack [vect]);
X
X	return (0);
X}
X
X/* hardware flow control interrupt handler */
Xstatic void
Xfas_fproc (fip, mdm_status)
Xregister struct fas_info	*fip;
Xregister uint	mdm_status;
X{
X	/* Check the output flow control signals and set the state flag
X	   accordingly.
X	*/
X	if (!(~mdm_status & fip->flow.m.oc)
X		|| (~mdm_status & fip->flow.m.oe)
X		|| !(fip->flow_flags.i & FF_HWO_HANDSHAKE))
X	{
X		if (fip->flow_flags.i & FF_HWO_STOPPED)
X		{
X			fip->flow_flags.s &= ~FF_HWO_STOPPED;
X			fas_xproc (fip);
X		}
X	}
X	else
X		fip->flow_flags.s |= FF_HWO_STOPPED;
X}
X
X/* modem status handler */
Xstatic void
Xfas_mproc (fip)
Xregister struct fas_info	*fip;
X{
X	register struct tty	*ttyp;
X	register uint	mdm_status;
X	int	old_level;
X
X	ttyp = fip->tty;
X	mdm_status = fip->new_msr;
X	fip->new_msr &= ~MS_RING_PRESENT;
X
X	/* Check the carrier detect signal and set the state flags
X	   accordingly. Also, if not in clocal mode, send SIGHUP on
X	   carrier loss and flush the buffers.
X	*/
X	if (!(fip->cflag & CLOCAL))
X	{
X		if (!(~mdm_status & fip->modem.m.ca))
X		{
X			ttyp->t_state |= CARR_ON;
X			/* Unblock getty open only if it is ready to run. */
X			if (ttyp->t_state & WOPEN)
X				(void) wakeup ((caddr_t) &ttyp->t_canq);
X		}
X		else
X		{
X			if (!(~fip->msr & fip->modem.m.ca))
X			{
X				ttyp->t_state &= ~CARR_ON;
X				old_level = SPLWRK ();
X				if (ttyp->t_state & ISOPEN)
X					(void) signal (ttyp->t_pgrp, SIGHUP);
X				(void) ttyflush (ttyp, FREAD | FWRITE);
X				(void) splx (old_level);
X			}
X		}
X	}
X
X	/* Check the unblock signal. If low->high edge, fake CARR_ON state
X	   flag and wake up getty open.
X	*/
X	if ((fip->o_state & OS_UNBLOCK_ENABLE)
X		&& !(fip->cflag & CLOCAL)
X		&& !(~mdm_status & fip->modem.m.ub)
X		&& (~fip->msr & fip->modem.m.ub)
X		&& (ttyp->t_state & WOPEN))
X	{
X		ttyp->t_state |= CARR_ON;
X		(void) wakeup ((caddr_t) &ttyp->t_canq);
X	}
X
X	fip->msr = mdm_status & ~MS_RING_PRESENT;
X
X	/* re-schedule if modem status flags have changed in the mean time */
X	if ((fip->new_msr ^ fip->msr) & MS_ANY_PRESENT)
X		event_sched (fip, EF_DO_MPROC);
X}
X
X/* Receiver interrupt handler. Translates input characters to character
X   sequences as described in TERMIO(7) man page.
X*/
Xstatic uint
Xfas_rproc (fip, line_status)
Xregister struct fas_info	*fip;
Xuint	line_status;
X{
X	struct tty	*ttyp;
X	uint	charac;
X	register uint	csize;
X	unchar	metta [4];
X	REGVAR;
X
X	ttyp = fip->tty;
X
X	/* Translate characters from FIFO according to the TERMIO(7)
X	   man page.
X	*/
X	do
X	{
X		charac = (line_status & LS_RCV_AVAIL)
X				? inb (RCV_DATA_PORT)
X				: 0;	/* was line status int only */
X
X		/* do we have to junk the character ? */
X		if (!(fip->cflag & CREAD) || !(ttyp->t_state & ISOPEN))
X		{
X			/* if there are FIFOs we take a short cut */
X			if (fip->device_flags.i & DF_DEVICE_IS_NS16550)
X				outb (NS_FIFO_CTL_PORT, STANDARD_NS_FIFO_SETUP
X							| NS_FIFO_CLR_RECV);
X			else if (fip->device_flags.i & DF_DEVICE_IS_I82510)
X			{
X				outb (I_BANK_PORT, I_BANK_1);
X				outb (I_RCM_PORT, I_FIFO_CLR_RECV);
X				outb (I_BANK_PORT, I_BANK_0);
X			}
X			continue;
X		}
X
X		csize = 0;
X
X		/* strip off 8th bit ? */
X		if (fip->iflag & ISTRIP)
X			charac &= 0x7f;
X
X		/* ignore parity errors ? */
X		if ((line_status & LS_PARITY_ERROR)
X			&& !(fip->iflag & INPCK))
X			line_status &= ~LS_PARITY_ERROR;
X
X		/* do we have some kind of character error ? */
X		if (line_status & (LS_PARITY_ERROR
X					| LS_FRAMING_ERROR
X					| LS_BREAK_DETECTED))
X		{
X#if defined (HAVE_VPIX)
X			if ((fip->iflag & (DOSMODE | PARMRK))
X					== (DOSMODE | PARMRK))
X			{
X				/* send status bits to VP/ix */
X				(void) fas_vpix_sr (fip, 1,
X					line_status & (LS_PARITY_ERROR
X							| LS_FRAMING_ERROR
X							| LS_BREAK_DETECTED));
X				/* we don't handle character errors in
X				   this routine if we are in DOS mode
X				*/
X				line_status &= ~(LS_PARITY_ERROR
X						| LS_FRAMING_ERROR
X						| LS_BREAK_DETECTED);
X				goto valid_char;
X			}
X#endif
X			/* is it a BREAK ? */
X			if (line_status & LS_BREAK_DETECTED)
X			{
X				if (!(fip->iflag & IGNBRK))
X					if (fip->iflag & BRKINT)
X					{
X						/* do BREAK interrupt */
X						event_sched (fip, EF_DO_BRKINT);
X					}
X					else
X					{
X						metta [csize] = 0;
X						csize++;
X						if (fip->iflag & PARMRK)
X						{
X							metta [csize] = 0;
X							csize++;
X							metta [csize] = 0xff;
X							csize++;
X						}
X					}
X			}
X			else if (!(fip->iflag & IGNPAR))
X				if (fip->iflag & PARMRK)
X				{
X					metta [csize] = charac;
X					csize++;
X					metta [csize] = 0;
X					csize++;
X					metta [csize] = 0xff;
X					csize++;
X				}
X				else
X				{
X					metta [csize] = 0;
X					csize++;
X				}
X		}
X		else
Xvalid_char:
X		/* is there a character to process ? */
X		if (line_status & LS_RCV_AVAIL)
X		{
X			if (fip->iflag & IXON)
X			{
X				/* do output start/stop handling */
X				if (fip->flow_flags.i & FF_SWO_STOPPED)
X				{
X#if defined (HAVE_VPIX)
X					if ((charac == fip->v86_ss.ss_start)
X#else
X					if ((charac == CSTART)
X#endif
X						|| (fip->iflag & IXANY))
X					{
X						fip->flow_flags.s &=
X							~FF_SWO_STOPPED;
X						ttyp->t_state &= ~TTSTOP;
X						/* restart output */
X						fas_xproc (fip);
X					}
X				}
X				else
X				{
X#if defined (HAVE_VPIX)
X					if (charac == fip->v86_ss.ss_stop)
X#else
X					if (charac == CSTOP)
X#endif
X					{
X						fip->flow_flags.s |=
X							FF_SWO_STOPPED;
X						ttyp->t_state |= TTSTOP;
X					}
X				}
X				/* we don't put start/stop characters
X				   into the receiver buffer
X				*/
X#if defined (HAVE_VPIX)
X				if ((charac == fip->v86_ss.ss_start)
X					|| (charac == fip->v86_ss.ss_stop))
X#else
X				if ((charac == CSTART)
X					|| (charac == CSTOP))
X#endif
X					continue;
X			}
X
X			if ((charac == 0xff) && (fip->iflag & PARMRK))
X			{
X				metta [csize] = 0xff;
X				csize++;
X				metta [csize] = 0xff;
X				csize++;
X			}
X			else
X			{
X				/* we take a short-cut if only one character
X				   has to be put into the receiver buffer
X				*/
X				if (fip->recv_ring_cnt < RECV_BUFF_SIZE)
X				{
X					fip->recv_ring_cnt++;
X					*fip->recv_ring_put_ptr = charac;
X					if (++fip->recv_ring_put_ptr
X						!= &fip->recv_buffer
X							[RECV_BUFF_SIZE])
X						continue;
X					fip->recv_ring_put_ptr =
X							&fip->recv_buffer [0];
X				}
X				continue;
X			}
X		}
X
X		if (!(csize) || (fip->recv_ring_cnt + csize > RECV_BUFF_SIZE))
X			continue;	/* nothing to put into recv buffer */
X
X		fip->recv_ring_cnt += csize;
X
X		/* store translation in ring buffer */
X		do
X		{
X			do
X			{
X				*fip->recv_ring_put_ptr = (metta - 1) [csize];
X				if (++fip->recv_ring_put_ptr
X					== &fip->recv_buffer [RECV_BUFF_SIZE])
X					break;
X			} while (--csize);
X			if (!csize)
X				break;
X			fip->recv_ring_put_ptr = &fip->recv_buffer [0];
X		} while (--csize);
X	} while ((line_status = inb (LINE_STATUS_PORT)) & LS_RCV_INT);
X
X	return (line_status);
X}
X
X/* Output characters to the transmitter register. */
Xstatic void
Xfas_xproc (fip)
Xregister struct fas_info	*fip;
X{
X	register uint	num_to_output;
X	REGVAR;
X
X	/* proceed only if transmitter is available */
X	if ((fip->device_flags.i & (DF_XMIT_BUSY | DF_XMIT_BREAK
X						| DF_XMIT_LOCKED))
X		|| (fip->flow_flags.i & FF_HWO_STOPPED))
X		goto sched;
X
X	/* determine the transmitter FIFO size */
X	if (fip->device_flags.i & (DF_DEVICE_IS_NS16550
X					| DF_DEVICE_IS_I82510))
X	{
X		if (fip->device_flags.i & DF_DEVICE_IS_NS16550)
X			num_to_output = OUTPUT_NS_FIFO_SIZE;
X		else
X			num_to_output = OUTPUT_I_FIFO_SIZE;
X	}
X	else
X		num_to_output = 1;
X
X	/* handle XON/XOFF input flow control requests */
X	if (fip->flow_flags.i & FF_SW_FC_REQ)
X	{
X#if defined (HAVE_VPIX)
X		outb (XMT_DATA_PORT, (fip->flow_flags.i & FF_SWI_STOPPED)
X					? fip->v86_ss.ss_stop
X					: fip->v86_ss.ss_start);
X#else
X		outb (XMT_DATA_PORT, (fip->flow_flags.i & FF_SWI_STOPPED)
X					? CSTOP
X					: CSTART);
X#endif
X		fip->tty->t_state &= ~(TTXON | TTXOFF);
X		fip->device_flags.s |= DF_XMIT_BUSY;
X		fip->flow_flags.s &= ~FF_SW_FC_REQ;
X		/* disable guard timeout */
X		if (fip->device_flags.i & DF_GUARD_TIMEOUT)
X		{
X			fip->device_flags.s &= ~DF_GUARD_TIMEOUT;
X			fip->tty->t_state &= ~TIMEOUT;
X			(void) untimeout (fip->timeout_idx);
X		}
X		num_to_output--;
X	}
X
X	/* bail out if output is suspended by XOFF */
X	if (fip->flow_flags.i & FF_SWO_STOPPED)
X		goto sched;
X
X	/* Determine how many chars to put into the transmitter
X	   register.
X	*/
X	if (fip->xmit_ring_cnt < num_to_output)
X		num_to_output = fip->xmit_ring_cnt;
X
X	/* no characters available ? */
X	if (!num_to_output)
X		goto sched;
X
X	/* output characters */
X	fip->xmit_ring_cnt -= num_to_output;
X
X	do
X	{
X		do
X		{
X			outb (XMT_DATA_PORT, *fip->xmit_ring_take_ptr);
X			if (++fip->xmit_ring_take_ptr
X					== &fip->xmit_buffer [XMIT_BUFF_SIZE])
X				break;
X		} while (--num_to_output);
X		if (!num_to_output)
X			break;
X		fip->xmit_ring_take_ptr = &fip->xmit_buffer [0];
X	} while (--num_to_output);
X
X	/* signal that transmitter is busy now */
X	fip->device_flags.s |= DF_XMIT_BUSY;
X	/* disable guard timeout */
X	if (fip->device_flags.i & DF_GUARD_TIMEOUT)
X	{
X		fip->device_flags.s &= ~DF_GUARD_TIMEOUT;
X		fip->tty->t_state &= ~TIMEOUT;
X		(void) untimeout (fip->timeout_idx);
X	}
X
X	/* schedule fas_xxfer () if there are more characters to transfer
X	   into the transmitter ring buffer
X	*/
Xsched:
X	if ((fip->xmit_ring_size > fip->xmit_ring_cnt)
X		&& (fip->tty->t_outq.c_cc || fip->tty->t_tbuf.c_count))
X	{
X		event_sched (fip, EF_DO_XXFER);
X	}
X}
X
X/* Asynchronous event handler. Scheduled by functions that can't do the
X   processing themselves because of execution time restrictions.
X*/
Xstatic void
Xfas_event (fip)
Xregister struct fas_info	*fip;
X{
X	int	old_level;
X
X	old_level = SPLINT ();
X
X	do
X	{
X		/* do the break interrupt */
X		if (fip->event_flags.i & EF_DO_BRKINT)
X		{
X			fip->event_flags.s &= ~EF_DO_BRKINT;
X			if (fip->tty->t_state & ISOPEN)
X			{
X				(void) SPLWRK ();
X				(*linesw [fip->tty->t_line].l_input)
X							(fip->tty, L_BREAK);
X				(void) SPLINT ();
X			}
X		}
X
X		/* transfer characters to the UNIX input buffer */
X		if (fip->event_flags.i & EF_DO_RXFER)
X		{
X			fip->event_flags.s &= ~EF_DO_RXFER;
X			if (!(fip->flow_flags.i & FF_RXFER_STOPPED))
X			{
X				(void) SPLWRK ();
X				fas_rxfer (fip);
X				(void) SPLINT ();
X				/* check input buffer high/low water marks */
X				fas_ihlw_check (fip);
X			}
X		}
X
X		/* transfer characters to the output ring buffer */
X		if (fip->event_flags.i & EF_DO_XXFER)
X		{
X			fip->event_flags.s &= ~EF_DO_XXFER;
X			(void) SPLWRK ();
X			fas_xxfer (fip);
X			(void) SPLINT ();
X			/* output characters */
X			fas_xproc (fip);
X		}
X
X		/* check the modem signals */
X		if (fip->event_flags.i & EF_DO_MPROC)
X		{
X			fip->event_flags.s &= ~EF_DO_MPROC;
X			fas_mproc (fip);
X#if defined (HAVE_VPIX)
X			if (((fip->iflag & (DOSMODE | PARMRK))
X					== (DOSMODE | PARMRK))
X				&& (fip->v86_intmask != V86VI_KBD))
X			{
X				/* send status bits to VP/ix */
X				if (fas_vpix_sr (fip, 2, fip->msr))
X					fip->event_flags.s |= EF_DO_RXFER;
X			}
X#endif
X		}
X
X#if defined (HAVE_VPIX)
X		/* send pseudorupt to VP/ix */
X		if (fip->event_flags.i & EF_SIGNAL_VPIX)
X		{
X			fip->event_flags.s &= ~EF_SIGNAL_VPIX;
X			if ((fip->iflag & DOSMODE) && fip->v86_proc)
X			{
X				(void) SPLWRK ();
X				(void) v86setint (fip->v86_proc,
X							fip->v86_intmask);
X				(void) SPLINT ();
X			}
X		}
X#endif
X	} while (fip->event_flags.i & EF_EVENT_MASK);	/* all done ? */
X
X	fip->event_flags.s &= ~EF_EVENT_SCHEDULED;
X	(void) splx (old_level);
X}
X
X#if defined (HAVE_VPIX)
X/* Send port status register to VP/ix */
Xstatic int
Xfas_vpix_sr (fip, token, status)
Xregister struct fas_info	*fip;
Xuint	token;
Xuint	status;
X{
X	if ((fip->recv_ring_cnt <= RECV_BUFF_SIZE - 3)
X		&& (fip->tty->t_state & ISOPEN))
X	{
X		/* sent the character sequence 0xff, <token>, <status>
X		   to VP/ix
X		*/
X		fip->recv_ring_cnt += 3;
X
X		*fip->recv_ring_put_ptr = 0xff;
X		if (++fip->recv_ring_put_ptr
X				== &fip->recv_buffer [RECV_BUFF_SIZE])
X			fip->recv_ring_put_ptr
X				= &fip->recv_buffer [0];
X		*fip->recv_ring_put_ptr = token;
X		if (++fip->recv_ring_put_ptr
X				== &fip->recv_buffer [RECV_BUFF_SIZE])
X			fip->recv_ring_put_ptr
X				= &fip->recv_buffer [0];
X		*fip->recv_ring_put_ptr = status;
X		if (++fip->recv_ring_put_ptr
X				== &fip->recv_buffer [RECV_BUFF_SIZE])
X			fip->recv_ring_put_ptr
X				= &fip->recv_buffer [0];
X		return (TRUE);
X	}
X	return (FALSE);
X}
X#endif
X
X/* Receiver ring buffer -> UNIX buffer transfer function. */
Xstatic void
Xfas_rxfer (fip)
Xregister struct fas_info	*fip;
X{
X	register struct tty	*ttyp;
X	register int	num_to_xfer;
X	int	num_save;
X	int	old_level;
X
X	ttyp = fip->tty;
X
X	for (;;)
X	{
X		if (!fip->recv_ring_cnt || !ttyp->t_rbuf.c_ptr)
X			break;	/* no characters to transfer */
X
X		/* determine how many characters to transfer */
X#if defined (HAVE_VPIX)
X		num_to_xfer = ((fip->iflag & DOSMODE)
X				? MAX_VPIX_FILL
X				: MAX_UNIX_FILL) - ttyp->t_rawq.c_cc;
X#else
X		num_to_xfer = MAX_UNIX_FILL - ttyp->t_rawq.c_cc;
X#endif
X
X		if (num_to_xfer < MIN_READ_CHUNK)
X			break;	/* input buffer full */
X
X#if defined (HAVE_VPIX)
X		/* wakeup VP/ix */
X		if ((fip->iflag & DOSMODE) && !ttyp->t_rawq.c_cc)
X			event_sched (fip, EF_SIGNAL_VPIX);
X#endif
X
X		/* determine how many characters are in one contigous block */
X		if (fip->recv_ring_cnt < num_to_xfer)
X			num_to_xfer = fip->recv_ring_cnt;
X		if (&fip->recv_buffer [RECV_BUFF_SIZE] - fip->recv_ring_take_ptr
X			< num_to_xfer)
X			num_to_xfer = &fip->recv_buffer [RECV_BUFF_SIZE]
X					- fip->recv_ring_take_ptr;
X		if (ttyp->t_rbuf.c_count < num_to_xfer)
X			num_to_xfer = ttyp->t_rbuf.c_count;
X
X		num_save = num_to_xfer;
X		ttyp->t_rbuf.c_count -= num_to_xfer;
X
X		/* do the transfer */
X		do
X		{
X			*ttyp->t_rbuf.c_ptr = *fip->recv_ring_take_ptr;
X			ttyp->t_rbuf.c_ptr++;
X			fip->recv_ring_take_ptr++;
X		} while (--num_to_xfer);
X
X		if (fip->recv_ring_take_ptr == &fip->recv_buffer [RECV_BUFF_SIZE])
X			fip->recv_ring_take_ptr = &fip->recv_buffer [0];
X
X		intr_disable ();
X		fip->recv_ring_cnt -= num_save;
X		intr_restore ();
X
X		ttyp->t_rbuf.c_ptr -= ttyp->t_rbuf.c_size
X					- ttyp->t_rbuf.c_count;
X		(*linesw [ttyp->t_line].l_input) (ttyp, L_BUF);
X	}
X}
X
X/* UNIX buffer -> transmitter ring buffer transfer function. */
Xstatic void
Xfas_xxfer (fip)
Xregister struct fas_info	*fip;
X{
X	register struct tty	*ttyp;
X	register int	num_to_xfer;
X	int	num_save;
X	int	old_level;
X
X	ttyp = fip->tty;
X
X	for (;;)
X	{
X		/* Check if tbuf is empty. If it is empty, reset buffer
X		   pointer and counter and get the next chunk of output
X		   characters.
X		*/
X		if (!ttyp->t_tbuf.c_ptr || !ttyp->t_tbuf.c_count)
X		{
X			if (ttyp->t_tbuf.c_ptr)
X				ttyp->t_tbuf.c_ptr -= ttyp->t_tbuf.c_size;
X			if (!((*linesw [ttyp->t_line].l_output) (ttyp)
X					& CPRES))
X				break;
X		}
X
X		/* set the maximum character limit */
X		num_to_xfer = fip->xmit_ring_size - fip->xmit_ring_cnt;
X
X		/* Return if transmitter ring buffer is full. */
X		if (num_to_xfer < 1)
X			break;
X
X		/* Determine how many chars to transfer this time. */
X		if (&fip->xmit_buffer [XMIT_BUFF_SIZE] - fip->xmit_ring_put_ptr
X			< num_to_xfer)
X			num_to_xfer = &fip->xmit_buffer [XMIT_BUFF_SIZE]
X					- fip->xmit_ring_put_ptr;
X		if (ttyp->t_tbuf.c_count < num_to_xfer)
X			num_to_xfer = ttyp->t_tbuf.c_count;
X
X		num_save = num_to_xfer;
X		ttyp->t_tbuf.c_count -= num_to_xfer;
X		ttyp->t_state |= BUSY;
X
X		/* do the transfer */
X		do
X		{
X			*fip->xmit_ring_put_ptr = *ttyp->t_tbuf.c_ptr;
X			ttyp->t_tbuf.c_ptr++;
X			fip->xmit_ring_put_ptr++;
X		} while (--num_to_xfer);
X
X		if (fip->xmit_ring_put_ptr == &fip->xmit_buffer [XMIT_BUFF_SIZE])
X			fip->xmit_ring_put_ptr = &fip->xmit_buffer [0];
X
X		intr_disable ();
X		fip->xmit_ring_cnt += num_save;
X		intr_restore ();
X	}
X}
X
X/* Input buffer high/low water mark check. */
Xstatic void
Xfas_ihlw_check (fip)
Xregister struct fas_info	*fip;
X{
X	REGVAR;
X
X#if defined (HAVE_VPIX)
X	/* don't touch the mcr if we are in dos mode and hardware input
X	   handshake is disabled (dos handles the handshake line(s)
X	   on its own in this mode)
X	*/
X	if ((fip->iflag & DOSMODE) && !(fip->flow_flags.i & FF_HWI_HANDSHAKE))
X		goto swflow;
X#endif
X	if (fip->flow_flags.i & FF_HWI_STOPPED)
X	{
X		/* If input buffer level has dropped below
X		   the low water mark and input was stopped
X		   by hardware handshake, restart input.
X		*/
X		if (!(fip->flow_flags.i & FF_HWI_HANDSHAKE)
X			|| (fip->recv_ring_cnt < HW_LOW_WATER))
X		{
X			fip->mcr |= fip->flow.m.ic;
X			outb (MDM_CTL_PORT, fip->mcr);
X			fip->flow_flags.s &= ~FF_HWI_STOPPED;
X		}
X	}
X	else
X	{
X		/* If input buffer level has risen above the
X		   high water mark and input is not yet
X		   stopped, stop input by hardware handshake.
X		*/
X		if ((fip->flow_flags.i & FF_HWI_HANDSHAKE)
X			&& (fip->recv_ring_cnt > HW_HIGH_WATER))
X		{
X			fip->mcr &= ~fip->flow.m.ic;
X			outb (MDM_CTL_PORT, fip->mcr);
X			fip->flow_flags.s |= FF_HWI_STOPPED;
X		}
X	}
X
Xswflow:
X	if (fip->flow_flags.i & FF_SWI_STOPPED)
X	{
X		/* If input buffer level has dropped below
X		   the low water mark and input was stopped
X		   by XOFF, send XON to restart input.
X		*/
X		if (!(fip->iflag & IXOFF)
X			|| (fip->recv_ring_cnt < SW_LOW_WATER))
X		{
X			fip->flow_flags.s &= ~FF_SWI_STOPPED;
X			fip->flow_flags.s ^= FF_SW_FC_REQ;
X			if (fip->flow_flags.i & FF_SW_FC_REQ)
X			{
X				fip->tty->t_state |= TTXON;
X				fas_xproc (fip);
X			}
X			else
X				fip->tty->t_state &= ~TTXOFF;
X		}
X	}
X	else
X	{
X		/* If input buffer level has risen above the
X		   high water mark and input is not yet
X		   stopped, send XOFF to stop input.
X		*/
X		if ((fip->iflag & IXOFF)
X			&& (fip->recv_ring_cnt > SW_HIGH_WATER))
X		{
X			fip->flow_flags.s |= FF_SWI_STOPPED;
X			fip->flow_flags.s ^= FF_SW_FC_REQ;
X			if (fip->flow_flags.i & FF_SW_FC_REQ)
X			{
X				fip->tty->t_state |= TTXOFF;
X				fas_xproc (fip);
X			}
X			else
X				fip->tty->t_state &= ~TTXON;
X		}
X	}
X}
X
X/* Handle hangup after last close */
Xstatic void
Xfas_hangup (fip)
Xregister struct fas_info	*fip;
X{
X	int	old_level;
X	REGVAR;
X
X	old_level = SPLINT ();
X
X	if (fip->device_flags.i & DF_MODEM_ENABLED)
X	{
X		fip->mcr &= ~(fip->modem.m.en
X				| fip->flow.m.ic);
X		outb (MDM_CTL_PORT, fip->mcr);
X		fip->device_flags.s &= ~DF_MODEM_ENABLED;
X		(void) timeout (fas_hangup, fip, HANGUP_TIME);
X	}
X	else
X	{
X		fip->device_flags.s &= ~DF_DO_HANGUP;
X		/* If there was a waiting getty open on this
X		   port, reopen the physical device.
X		*/
X		if (fip->o_state & OS_WAIT_OPEN)
X		{
X			fas_open_device (fip);
X			fas_param (fip);	/* set up port regs */
X			fas_mproc (fip);	/* set up mdm stat flags */
X		}
X		release_device_lock (fip);
X	}
X	(void) splx (old_level);
X}
X
X/* main timeout function */
Xstatic void
Xfas_timeout (fip)
Xregister struct fas_info	*fip;
X{
X	int	old_level;
X	REGVAR;
X
X	old_level = SPLINT ();
X
X	/* handle break request */
X	if (fip->device_flags.i & DF_DO_BREAK)
X	{
X		/* set up break request flags */
X		fip->lcr |= LC_SET_BREAK_LEVEL;
X		outb (LINE_CTL_PORT, fip->lcr);
X		fip->device_flags.s &= ~(DF_DO_BREAK | DF_GUARD_TIMEOUT);
X		(void) timeout (fas_timeout, fip, BREAK_TIME);
X		(void) splx (old_level);
X		return;
X	}
X
X	/* reset break state */
X	if (fip->device_flags.i & DF_XMIT_BREAK)
X	{
X		if (fip->lcr & LC_SET_BREAK_LEVEL)
X		{
X			fip->lcr &= ~LC_SET_BREAK_LEVEL;
X			outb (LINE_CTL_PORT, fip->lcr);
X			fip->device_flags.s |= DF_GUARD_TIMEOUT;
X			fip->timeout_idx = timeout (fas_timeout, fip,
X					fas_ctimes [fip->cflag & CBAUD]);
X			(void) splx (old_level);
X			return;
X		}
X		fip->device_flags.s &= ~DF_XMIT_BREAK;
X		/* restart output after BREAK */
X		fas_xproc (fip);
X	}
X
X	/* handle character guard timeout */
X	if (fip->device_flags.i & DF_GUARD_TIMEOUT)
X	{
X		fip->device_flags.s &= ~DF_GUARD_TIMEOUT;
X		if (!fip->xmit_ring_cnt
X			&& !fip->tty->t_outq.c_cc
X			&& !fip->tty->t_tbuf.c_count)
X		{
X			fip->tty->t_state &= ~BUSY;
X		}
X	}
X
X	fip->tty->t_state &= ~TIMEOUT;
X
X	event_sched (fip, EF_DO_XXFER);
X
X	(void) wakeup ((caddr_t) &(fip)->device_flags.i);
X	(void) splx (old_level);
X}
X
X/* Several functions for flow control, character output and special event
X   requests and handling.
X*/
Xstatic void
Xfas_cmd (fip, ttyp, arg2)
Xregister struct fas_info	*fip;
Xregister struct tty	*ttyp;
Xint	arg2;
X{
X	REGVAR;
X
X	switch (arg2)
X	{
X	case T_TIME:	/* timeout */
X		goto start_output;
X
X	case T_OUTPUT:	/* output characters to the transmitter */
X		if (fip->xmit_ring_size > fip->xmit_ring_cnt)
X		{
Xstart_output:
X			event_sched (fip, EF_DO_XXFER);
X		}
X		break;
X
X	case T_SUSPEND:	/* suspend character output */
X		fip->flow_flags.s |= FF_SWO_STOPPED;
X		ttyp->t_state |= TTSTOP;
X		break;
X
X	case T_RESUME:	/* restart character output */
X		fip->flow_flags.s &= ~FF_SWO_STOPPED;
X		ttyp->t_state &= ~TTSTOP;
X		fas_xproc (fip);
X		break;
X
X	case T_BLOCK:	/* stop character input, request XOFF */
X		ttyp->t_state |= TBLOCK;
X		break;	/* note: we do our own XON/XOFF */
X
X	case T_UNBLOCK:	/* restart character input, request XON */
X		ttyp->t_state &= ~TBLOCK;
X		break;	/* note: we do our own XON/XOFF */
X
X	case T_RFLUSH:	/* flush input buffers and restart input */
X		if (fip->device_flags.i & DF_DEVICE_IS_NS16550)
X			outb (NS_FIFO_CTL_PORT, STANDARD_NS_FIFO_SETUP
X						| NS_FIFO_CLR_RECV);
X		else if (fip->device_flags.i & DF_DEVICE_IS_I82510)
X		{
X			outb (I_BANK_PORT, I_BANK_1);
X			outb (I_RCM_PORT, I_FIFO_CLR_RECV);
X			outb (I_BANK_PORT, I_BANK_0);
X		}
X
X		fip->recv_ring_take_ptr = fip->recv_ring_put_ptr;
X		fip->recv_ring_cnt = 0;
X
X		if (fip->flow_flags.i & FF_HWI_STOPPED)
X		{
X			fip->mcr |= fip->flow.m.ic;
X			outb (MDM_CTL_PORT, fip->mcr);
X			fip->flow_flags.s &= ~FF_HWI_STOPPED;
X		}
X
X		ttyp->t_state &= ~TBLOCK;
X
X		if (fip->flow_flags.i & FF_SWI_STOPPED)
X		{
X			fip->flow_flags.s &= ~FF_SWI_STOPPED;
X			fip->flow_flags.s ^= FF_SW_FC_REQ;
X			if (fip->flow_flags.i & FF_SW_FC_REQ)
X			{
X				ttyp->t_state |= TTXON;
X				fas_xproc (fip);
X			}
X			else
X				ttyp->t_state &= ~TTXOFF;
X		}
X		break;
X
X	case T_WFLUSH:	/* flush output buffer and restart output */
X		if (fip->device_flags.i & DF_DEVICE_IS_NS16550)
X			outb (NS_FIFO_CTL_PORT, STANDARD_NS_FIFO_SETUP
X						| NS_FIFO_CLR_XMIT);
X		else if (fip->device_flags.i & DF_DEVICE_IS_I82510)
X		{
X			outb (I_BANK_PORT, I_BANK_1);
X			outb (I_TCM_PORT, I_FIFO_CLR_XMIT);
X			outb (I_BANK_PORT, I_BANK_0);
X		}
X
X		fip->xmit_ring_take_ptr = fip->xmit_ring_put_ptr;
X		fip->xmit_ring_cnt = 0;
X
X		fip->flow_flags.s &= ~FF_SWO_STOPPED;
X		ttyp->t_state &= ~TTSTOP;
X
X		if (ttyp->t_tbuf.c_ptr)
X			ttyp->t_tbuf.c_ptr += ttyp->t_tbuf.c_count;
X		ttyp->t_tbuf.c_count = 0;
X
X		if (!(fip->device_flags.i & (DF_XMIT_BUSY | DF_GUARD_TIMEOUT))
X			&& (ttyp->t_state & BUSY))
X		{
X			ttyp->t_state &= ~BUSY;
X			goto start_output;
X		}
X		break;
X
X	case T_BREAK:	/* do a break on the transmitter line */
X		fip->device_flags.s |= DF_XMIT_BREAK;
X		ttyp->t_state |= TIMEOUT;
X		if (fip->device_flags.i & (DF_XMIT_BUSY | DF_GUARD_TIMEOUT))
X		{
X			fip->device_flags.s |= DF_DO_BREAK;
X		}
X		else
X		{
X			/* set up break request flags */
X			fip->lcr |= LC_SET_BREAK_LEVEL;
X			outb (LINE_CTL_PORT, fip->lcr);
X			(void) timeout (fas_timeout, fip, BREAK_TIME);
X		}
X		break;
X
X	case T_PARM:	/* set up the port according to the termio structure */
X		fas_param (fip);
X		break;
X
X	case T_SWTCH:	/* handle layer switch request */
X		break;
X	}
X}
X
X/* open device physically */
Xstatic void
Xfas_open_device (fip)
Xregister struct fas_info	*fip;
X{
X	REGVAR;
X
X	fip->device_flags.s &= DF_DEVICE_CONFIGURED | DF_DEVICE_IS_NS16550
X				| DF_DEVICE_IS_I82510 | DF_DEVICE_LOCKED;
X	fip->flow_flags.s = 0;
X	fip->cflag = 0;
X	fip->iflag = 0;
X	fip->recv_ring_take_ptr = fip->recv_ring_put_ptr;
X	fip->recv_ring_cnt = 0;
X	fip->xmit_ring_take_ptr = fip->xmit_ring_put_ptr;
X	fip->xmit_ring_cnt = 0;
X
X	/* hook into the interrupt users chain */
X	fip->next_int_user = fas_first_int_user [fip->vec];
X	if (fip->next_int_user)
X		fip->next_int_user->prev_int_user = fip;
X	fas_first_int_user [fip->vec] = fip;
X	fip->prev_int_user = (struct fas_info *) NULL;
X
X	fip->lcr = 0;
X	outb (LINE_CTL_PORT, fip->lcr);
X
X	if (fip->device_flags.i & DF_DEVICE_IS_NS16550)
X		outb (NS_FIFO_CTL_PORT, STANDARD_NS_FIFO_CLEAR);
X	else if (fip->device_flags.i & DF_DEVICE_IS_I82510)
X	{
X		outb (I_BANK_PORT, I_BANK_1);
X		outb (I_TCM_PORT, I_FIFO_CLR_XMIT);
X		outb (I_RCM_PORT, I_FIFO_CLR_RECV);
X		outb (I_BANK_PORT, I_BANK_2);
X		outb (I_IDM_PORT, STANDARD_I_FIFO_CLEAR);
X		outb (I_BANK_PORT, I_BANK_0);
X	}
X
X	/* clear interrupts */
X	inb (MDM_STATUS_PORT);
X	inb (RCV_DATA_PORT);
X	inb (RCV_DATA_PORT);
X	inb (LINE_STATUS_PORT);
X	inb (INT_ID_PORT);
X	if (INT_ACK_PORT)
X		outb (INT_ACK_PORT, fip->int_ack);
X
X	if (fip->device_flags.i & DF_DEVICE_IS_NS16550)
X		outb (NS_FIFO_CTL_PORT, STANDARD_NS_FIFO_SETUP);
X	else if (fip->device_flags.i & DF_DEVICE_IS_I82510)
X	{
X		outb (I_BANK_PORT, I_BANK_2);
X		outb (I_IDM_PORT, STANDARD_I_FIFO_SETUP);
X		outb (I_BANK_PORT, I_BANK_0);
X	}
X
X	fip->msr = fip->new_msr = inb (MDM_STATUS_PORT)
X					& (MS_CTS_PRESENT
X						| MS_DSR_PRESENT
X						| MS_DCD_PRESENT);
X
X	fip->ier = IE_INIT_MODE;
X	outb (INT_ENABLE_PORT, fip->ier);
X
X	fip->mcr |= fip->modem.m.en | fip->flow.m.ic;
X	outb (MDM_CTL_PORT, fip->mcr);
X
X	fip->device_flags.s |= DF_DEVICE_OPEN | DF_MODEM_ENABLED;
X}
X
X/* close device physically */
Xstatic void
Xfas_close_device (fip)
Xregister struct fas_info	*fip;
X{
X	REGVAR;
X
X	fip->device_flags.s &= ~DF_DEVICE_OPEN;
X	fip->ier = IE_NONE;	/* disable all ints from UART */
X	outb (INT_ENABLE_PORT, fip->ier);
X	if (INT_ACK_PORT)
X		outb (INT_ACK_PORT, fip->int_ack);
X
X	if (fip->device_flags.i & DF_DEVICE_IS_NS16550)
X		outb (NS_FIFO_CTL_PORT, STANDARD_NS_FIFO_CLEAR);
X	else if (fip->device_flags.i & DF_DEVICE_IS_I82510)
X	{
X		outb (I_BANK_PORT, I_BANK_1);
X		outb (I_TCM_PORT, I_FIFO_CLR_XMIT);
X		outb (I_RCM_PORT, I_FIFO_CLR_RECV);
X		outb (I_BANK_PORT, I_BANK_2);
X		outb (I_IDM_PORT, STANDARD_I_FIFO_CLEAR);
X		outb (I_BANK_PORT, I_BANK_0);
X	}
X
X	/* reset break level */
X	fip->lcr &= ~LC_SET_BREAK_LEVEL;
X	outb (LINE_CTL_PORT, fip->lcr);
X
X	/* unhook from interrupt users chain */
X	if (fip->prev_int_user)
X		fip->prev_int_user->next_int_user = fip->next_int_user;
X	else
X		fas_first_int_user [fip->vec] = fip->next_int_user;
X	if (fip->next_int_user)
X		fip->next_int_user->prev_int_user = fip->prev_int_user;
X
X	if (fip->cflag & HUPCL)
X	{
X		/* request hangup */
X		fip->device_flags.s |= DF_DO_HANGUP;
X		(void) timeout (fas_hangup, fip, HANGUP_DELAY);
X	}
X}
X
X/* test device thoroughly */
Xstatic int
Xfas_test_device (fip)
Xregister struct fas_info	*fip;
X{
X	register unchar	*cptr;
X	int	done, delay_count, i;
X	static uint	lcrval [3] =
X	{
X		LC_WORDLEN_8,
X		LC_WORDLEN_8 | LC_ENABLE_PARITY,
X		LC_WORDLEN_8 | LC_ENABLE_PARITY | LC_EVEN_PARITY
X	};
X	REGVAR;
X
X	/* make sure FIFO is off */
X	outb (NS_FIFO_CTL_PORT, STANDARD_NS_FIFO_CLEAR);
X	outb (I_BANK_PORT, I_BANK_2);
X	outb (I_IDM_PORT, STANDARD_I_FIFO_CLEAR);
X	outb (I_BANK_PORT, I_BANK_0);
X
X	/* set counter divisor */
X	outb (LINE_CTL_PORT, LC_ENABLE_DIVISOR);
X	outb (DIVISOR_LSB_PORT, fas_speeds [B38400]);
X	outb (DIVISOR_MSB_PORT, fas_speeds [B38400] >> 8);
X	outb (LINE_CTL_PORT, 0);
X
X	/* switch to local loopback */
X	outb (MDM_CTL_PORT, MC_SET_LOOPBACK);
X
X	done = 0;
X
X	/* wait until the transmitter register is empty */
X	for (delay_count = 20000;
X		delay_count && (~inb (LINE_STATUS_PORT)
X				& (LS_XMIT_AVAIL | LS_XMIT_COMPLETE));
X		delay_count--)
X		;
X
X	if (!delay_count)
X		done = 1;
X
X	if (!done)
X	{
X		/* clear flags */
X		inb (RCV_DATA_PORT);
X		inb (RCV_DATA_PORT);
X		inb (LINE_STATUS_PORT);
X
X		/* make sure there are no more characters in the
X		   receiver register
X		*/
X		for (delay_count = 20000;
X			delay_count && !(inb (LINE_STATUS_PORT) & LS_RCV_AVAIL);
X			delay_count--)
X			;
X
X		if (delay_count)
X			inb (RCV_DATA_PORT);
X
X		/* test pattern */
X		cptr = (unchar *) "\377\125\252\045\244\0";
X
X		do
X		{
X			for (i = 0; i < 3; i++)
X			{
X				/* test transmitter and receiver
SHAR_EOF
true || echo 'restore of fas.c failed'
fi
echo 'End of  part 2'
echo 'File fas.c is continued in part 3'
echo 3 > _shar_seq_.tmp
exit 0
-- 
Uwe Doering  |  Domain   : gemini at geminix.in-berlin.de
Berlin       |----------------------------------------------------------------
Germany      |  Bangpath : ...!unido!fub!tmpmbx!geminix!gemini



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