[unix-history] / sys / i386 / isa / com.c

/*-
 * Copyright (c) 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	from: @(#)com.c	7.5 (Berkeley) 5/16/91
 *	$Id$
 */

#include "com.h"
#if NCOM > 0
/*
 * COM driver, based on HP dca driver
 * uses National Semiconductor NS16450/NS16550AF UART
 */
#include "param.h"
#include "systm.h"
#include "ioctl.h"
#include "tty.h"
#include "proc.h"
#include "user.h"
#include "conf.h"
#include "file.h"
#include "uio.h"
#include "kernel.h"
#include "syslog.h"

#include "i386/isa/isa.h"
#include "i386/isa/isa_device.h"
#include "i386/isa/comreg.h"
#include "i386/isa/ic/ns16550.h"
#define cominor(d)

int 	comprobe(), comattach(), comintr(), comstart(), comparam();

struct	isa_driver comdriver = {
	comprobe, comattach, "com"
};

int	comsoftCAR;
int	com_active;
int	com_hasfifo;
int	ncom = NCOM;
#ifdef COMCONSOLE
int	comconsole = COMCONSOLE;
#else
int	comconsole = -1;
#endif
int	comconsinit;
int	comdefaultrate = TTYDEF_SPEED;
int	commajor;
short com_addr[NCOM];
struct	tty com_tty[NCOM];

struct speedtab comspeedtab[] = {
	0,	0,
	50,	COMBRD(50),
	75,	COMBRD(75),
	110,	COMBRD(110),
	134,	COMBRD(134),
	150,	COMBRD(150),
	200,	COMBRD(200),
	300,	COMBRD(300),
	600,	COMBRD(600),
	1200,	COMBRD(1200),
	1800,	COMBRD(1800),
	2400,	COMBRD(2400),
	4800,	COMBRD(4800),
	9600,	COMBRD(9600),
	19200,	COMBRD(19200),
	38400,	COMBRD(38400),
	57600,	COMBRD(57600),
	-1,	-1
};

extern	struct tty *constty;
#ifdef KGDB
#include "machine/remote-sl.h"

extern int kgdb_dev;
extern int kgdb_rate;
extern int kgdb_debug_init;
#endif

#define	UNIT(x)		(minor(x))

comprobe(dev)
struct isa_device *dev;
{
	/* force access to id reg */
	outb(dev->id_iobase+com_cfcr, 0);
	outb(dev->id_iobase+com_iir, 0);
	DELAY(100);
	if ((inb(dev->id_iobase+com_iir) & 0x38) == 0)
		return(IO_COMSIZE);
	return(0);
}


int
comattach(isdp)
struct isa_device *isdp;
{
	struct	tty	*tp;
	u_char		unit;
	int		port = isdp->id_iobase;

	unit = isdp->id_unit;
	if (unit == comconsole)
		DELAY(1000);
	com_addr[unit] = port;
	com_active |= 1 << unit;
	comsoftCAR |= 1 << unit;	/* XXX */

	/* look for a NS 16550AF UART with FIFOs */
	outb(port+com_fifo, FIFO_ENABLE|FIFO_RCV_RST|FIFO_XMT_RST|FIFO_TRIGGER_4);
	DELAY(100);
	if ((inb(port+com_iir) & IIR_FIFO_MASK) == IIR_FIFO_MASK) {
		com_hasfifo |= 1 << unit;
		printf("com%d: fifo\n", unit);
	}

	outb(port+com_ier, 0);
	outb(port+com_mcr, 0 | MCR_IENABLE);
#ifdef KGDB
	if (kgdb_dev == makedev(commajor, unit)) {
		if (comconsole == unit)
			kgdb_dev = -1;	/* can't debug over console port */
		else {
			(void) cominit(unit, kgdb_rate);
			if (kgdb_debug_init) {
				/*
				 * Print prefix of device name,
				 * let kgdb_connect print the rest.
				 */
				printf("com%d: ", unit);
				kgdb_connect(1);
			} else
				printf("com%d: kgdb enabled\n", unit);
		}
	}
#endif
	/*
	 * Need to reset baud rate, etc. of next print so reset comconsinit.
	 * Also make sure console is always "hardwired"
	 */
	if (unit == comconsole) {
		comconsinit = 0;
		comsoftCAR |= (1 << unit);
	}
	return (1);
}

/* ARGSUSED */
comopen(dev_t dev, int flag, int mode, struct proc *p)
{
	register struct tty *tp;
	register int unit;
	int error = 0;
 
	unit = UNIT(dev);
	if (unit >= NCOM || (com_active & (1 << unit)) == 0)
		return (ENXIO);
	tp = &com_tty[unit];
	tp->t_oproc = comstart;
	tp->t_param = comparam;
	tp->t_dev = dev;
	if ((tp->t_state & TS_ISOPEN) == 0) {
		tp->t_state |= TS_WOPEN;
		ttychars(tp);
		if (tp->t_ispeed == 0) {
			tp->t_iflag = TTYDEF_IFLAG;
			tp->t_oflag = TTYDEF_OFLAG;
			tp->t_cflag = TTYDEF_CFLAG;
			tp->t_lflag = TTYDEF_LFLAG;
			tp->t_ispeed = tp->t_ospeed = comdefaultrate;
		}
		comparam(tp, &tp->t_termios);
		ttsetwater(tp);
	} else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0)
		return (EBUSY);
	(void) spltty();
	(void) commctl(dev, MCR_DTR | MCR_RTS, DMSET);
	if ((comsoftCAR & (1 << unit)) || (commctl(dev, 0, DMGET) & MSR_DCD))
		tp->t_state |= TS_CARR_ON;
	while ((flag&O_NONBLOCK) == 0 && (tp->t_cflag&CLOCAL) == 0 &&
	       (tp->t_state & TS_CARR_ON) == 0) {
		tp->t_state |= TS_WOPEN;
		if (error = ttysleep(tp, (caddr_t)&tp->t_raw, TTIPRI | PCATCH,
		    ttopen, 0))
			break;
	}
	(void) spl0();
	if (error == 0)
		error = (*linesw[tp->t_line].l_open)(dev, tp);
	return (error);
}
 
/*ARGSUSED*/
comclose(dev, flag, mode, p)
	dev_t dev;
	int flag, mode;
	struct proc *p;
{
	register struct tty *tp;
	register com;
	register int unit;
 
	unit = UNIT(dev);
	com = com_addr[unit];
	tp = &com_tty[unit];
	(*linesw[tp->t_line].l_close)(tp, flag);
	outb(com+com_cfcr, inb(com+com_cfcr) & ~CFCR_SBREAK);
#ifdef KGDB
	/* do not disable interrupts if debugging */
	if (kgdb_dev != makedev(commajor, unit))
#endif
	outb(com+com_ier, 0);
	if (tp->t_cflag&HUPCL || tp->t_state&TS_WOPEN || 
	    (tp->t_state&TS_ISOPEN) == 0)
		(void) commctl(dev, 0, DMSET);
	ttyclose(tp);
	return(0);
}
 
comread(dev, uio, flag)
	dev_t dev;
	struct uio *uio;
{
	register struct tty *tp = &com_tty[UNIT(dev)];
 
	return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
}
 
comwrite(dev, uio, flag)
	dev_t dev;
	struct uio *uio;
{
	int unit = UNIT(dev);
	register struct tty *tp = &com_tty[unit];
 
	/*
	 * (XXX) We disallow virtual consoles if the physical console is
	 * a serial port.  This is in case there is a display attached that
	 * is not the console.  In that situation we don't need/want the X
	 * server taking over the console.
	 */
	if (constty && unit == comconsole)
		constty = NULL;
	return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
}
 
comintr(unit)
	register int unit;
{
	register com;
	register u_char code;
	register struct tty *tp;

	unit;
	com = com_addr[unit];
	while (1) {
		code = inb(com+com_iir);
		switch (code & IIR_IMASK) {
		case IIR_NOPEND:
			return (1);
		case IIR_RXTOUT:
		case IIR_RXRDY:
			tp = &com_tty[unit];
/*
 * Process received bytes.  Inline for speed...
 */
#ifdef KGDB
#define	RCVBYTE() \
			code = inb(com+com_data); \
			if ((tp->t_state & TS_ISOPEN) == 0) { \
				if (kgdb_dev == makedev(commajor, unit) && \
				    code == FRAME_END) \
					kgdb_connect(0); /* trap into kgdb */ \
			} else \
				(*linesw[tp->t_line].l_rint)(code, tp)
#else
#define	RCVBYTE() \
			code = inb(com+com_data); \
			if (tp->t_state & TS_ISOPEN) \
				(*linesw[tp->t_line].l_rint)(code, tp)
#endif

			RCVBYTE();

			if (com_hasfifo & (1 << unit))
				while ((code = inb(com+com_lsr)) & LSR_RCV_MASK) {
					if (code == LSR_RXRDY) {
						RCVBYTE();
					} else
						comeint(unit, code, com);
				}
			break;
		case IIR_TXRDY:
			tp = &com_tty[unit];
			tp->t_state &=~ (TS_BUSY|TS_FLUSH);
			if (tp->t_line)
				(*linesw[tp->t_line].l_start)(tp);
			else
				comstart(tp);
			break;
		case IIR_RLS:
			comeint(unit, inb(com+com_lsr), com);
			break;
		default:
			if (code & IIR_NOPEND)
				return (1);
			log(LOG_WARNING, "com%d: weird interrupt: 0x%x\n",
			    unit, code);
			/* fall through */
		case IIR_MLSC:
			commint(unit, com);
			break;
		}
	}
}

comeint(unit, stat, com)
	register int unit, stat;
	register com;
{
	register struct tty *tp;
	register int c;

	tp = &com_tty[unit];
	c = inb(com+com_data);
	if ((tp->t_state & TS_ISOPEN) == 0) {
#ifdef KGDB
		/* we don't care about parity errors */
		if (((stat & (LSR_BI|LSR_FE|LSR_PE)) == LSR_PE) &&
		    kgdb_dev == makedev(commajor, unit) && c == FRAME_END)
			kgdb_connect(0); /* trap into kgdb */
#endif
		return;
	}
	if (stat & (LSR_BI | LSR_FE))
		c |= TTY_FE;
	else if (stat & LSR_PE)
		c |= TTY_PE;
	else if (stat & LSR_OE) {			/* 30 Aug 92*/
		c |= TTY_PE;	/* Ought to have it's own define... */
		log(LOG_WARNING, "com%d: silo overflow\n", unit);
	}
	(*linesw[tp->t_line].l_rint)(c, tp);
}

commint(unit, com)
	register int unit;
	register com;
{
	register struct tty *tp;
	register int stat;

	tp = &com_tty[unit];
	stat = inb(com+com_msr);
	if ((stat & MSR_DDCD) && (comsoftCAR & (1 << unit)) == 0) {
		if (stat & MSR_DCD)
			(void)(*linesw[tp->t_line].l_modem)(tp, 1);
		else if ((*linesw[tp->t_line].l_modem)(tp, 0) == 0)
			outb(com+com_mcr,
				inb(com+com_mcr) & ~(MCR_DTR | MCR_RTS) | MCR_IENABLE);
	} else if ((stat & MSR_DCTS) && (tp->t_state & TS_ISOPEN) &&
		   (tp->t_cflag & CRTSCTS)) {
		/* the line is up and we want to do rts/cts flow control */
		if (stat & MSR_CTS) {
			tp->t_state &=~ TS_TTSTOP;
			ttstart(tp);
		} else
			tp->t_state |= TS_TTSTOP;
	}
}

comioctl(dev, cmd, data, flag)
	dev_t dev;
	caddr_t data;
{
	register struct tty *tp;
	register int unit = UNIT(dev);
	register com;
	register int error;
 
	tp = &com_tty[unit];
	error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag);
	if (error >= 0)
		return (error);
	error = ttioctl(tp, cmd, data, flag);
	if (error >= 0)
		return (error);

	com = com_addr[unit];
	switch (cmd) {

	case TIOCSBRK:
		outb(com+com_cfcr, inb(com+com_cfcr) | CFCR_SBREAK);
		break;

	case TIOCCBRK:
		outb(com+com_cfcr, inb(com+com_cfcr) & ~CFCR_SBREAK);
		break;

	case TIOCSDTR:
		(void) commctl(dev, MCR_DTR | MCR_RTS, DMBIS);
		break;

	case TIOCCDTR:
		(void) commctl(dev, MCR_DTR | MCR_RTS, DMBIC);
		break;

	case TIOCMSET:
		(void) commctl(dev, *(int *)data, DMSET);
		break;

	case TIOCMBIS:
		(void) commctl(dev, *(int *)data, DMBIS);
		break;

	case TIOCMBIC:
		(void) commctl(dev, *(int *)data, DMBIC);
		break;

	case TIOCMGET:
		*(int *)data = commctl(dev, 0, DMGET);
		break;

	default:
		return (ENOTTY);
	}
	return (0);
}

comparam(tp, t)
	register struct tty *tp;
	register struct termios *t;
{
	register com;
	register int cfcr, cflag = t->c_cflag;
	int unit = UNIT(tp->t_dev);
	int ospeed = ttspeedtab(t->c_ospeed, comspeedtab);
 
	/* check requested parameters */
        if (ospeed < 0 || (t->c_ispeed && t->c_ispeed != t->c_ospeed))
                return(EINVAL);
        /* and copy to tty */
        tp->t_ispeed = t->c_ispeed;
        tp->t_ospeed = t->c_ospeed;
        tp->t_cflag = cflag;

	com = com_addr[unit];
	outb(com+com_ier, IER_ERXRDY | IER_ETXRDY | IER_ERLS /*| IER_EMSC*/);
	if (ospeed == 0) {
		(void) commctl(unit, 0, DMSET);	/* hang up line */
		return(0);
	}
	outb(com+com_cfcr, inb(com+com_cfcr) | CFCR_DLAB);
	outb(com+com_data, ospeed & 0xFF);
	outb(com+com_ier, ospeed >> 8);
	switch (cflag&CSIZE) {
	case CS5:
		cfcr = CFCR_5BITS; break;
	case CS6:
		cfcr = CFCR_6BITS; break;
	case CS7:
		cfcr = CFCR_7BITS; break;
	case CS8:
		cfcr = CFCR_8BITS; break;
	}
	if (cflag&PARENB) {
		cfcr |= CFCR_PENAB;
		if ((cflag&PARODD) == 0)
			cfcr |= CFCR_PEVEN;
	}
	if (cflag&CSTOPB)
		cfcr |= CFCR_STOPB;
	outb(com+com_cfcr, cfcr);

	if (com_hasfifo & (1 << unit))
		outb(com+com_fifo, FIFO_ENABLE | FIFO_TRIGGER_4);

	return(0);
}
 
comstart(tp)
	register struct tty *tp;
{
	register com;
	int s, unit, c;
 
	unit = UNIT(tp->t_dev);
	com = com_addr[unit];
	s = spltty();
	if (tp->t_state & (TS_TIMEOUT|TS_TTSTOP))
		goto out;
	if (RB_LEN(&tp->t_out) <= tp->t_lowat) {
		if (tp->t_state&TS_ASLEEP) {
			tp->t_state &= ~TS_ASLEEP;
			wakeup((caddr_t)&tp->t_out);
		}
		if (tp->t_wsel) {
			selwakeup(tp->t_wsel, tp->t_state & TS_WCOLL);
			tp->t_wsel = 0;
			tp->t_state &= ~TS_WCOLL;
		}
	}
	if (RB_LEN(&tp->t_out) == 0)
		goto out;
	if (inb(com+com_lsr) & LSR_TXRDY) {
		c = getc(&tp->t_out);
		tp->t_state |= TS_BUSY;
		outb(com+com_data, c);
		if (com_hasfifo & (1 << unit))
			for (c = 1; c < 16 && RB_LEN(&tp->t_out); ++c)
				outb(com+com_data, getc(&tp->t_out));
	}
out:
	splx(s);
}
 
/*
 * Stop output on a line.
 */
/*ARGSUSED*/
comstop(tp, flag)
	register struct tty *tp;
{
	register int s;

	s = spltty();
	if (tp->t_state & TS_BUSY) {
		if ((tp->t_state&TS_TTSTOP)==0)
			tp->t_state |= TS_FLUSH;
	}
	splx(s);
}
 
commctl(dev, bits, how)
	dev_t dev;
	int bits, how;
{
	register com;
	register int unit;
	int s;

	unit = UNIT(dev);
	com = com_addr[unit];
	s = spltty();
	switch (how) {

	case DMSET:
		outb(com+com_mcr, bits | MCR_IENABLE);
		break;

	case DMBIS:
		outb(com+com_mcr, inb(com+com_mcr) | bits | MCR_IENABLE);
		break;

	case DMBIC:
		outb(com+com_mcr, inb(com+com_mcr) & ~bits | MCR_IENABLE);
		break;

	case DMGET:
		bits = inb(com+com_msr);
		break;
	}
	(void) splx(s);
	return(bits);
}

/*
 * Following are all routines needed for COM to act as console
 */
#include "i386/i386/cons.h"

comcnprobe(cp)
	struct consdev *cp;
{
	int unit;

	/* locate the major number */
	for (commajor = 0; commajor < nchrdev; commajor++)
		if (cdevsw[commajor].d_open == comopen)
			break;

	/* XXX: ick */
	unit = CONUNIT;
	com_addr[CONUNIT] = CONADDR;

	/* make sure hardware exists?  XXX */

	/* initialize required fields */
	cp->cn_dev = makedev(commajor, unit);
	cp->cn_tp = &com_tty[unit];
#ifdef	COMCONSOLE
	cp->cn_pri = CN_REMOTE;		/* Force a serial port console */
#else
	cp->cn_pri = CN_NORMAL;
#endif
}

comcninit(cp)
	struct consdev *cp;
{
	int unit = UNIT(cp->cn_dev);

	cominit(unit, comdefaultrate);
	comconsole = unit;
	comconsinit = 1;
}

cominit(unit, rate)
	int unit, rate;
{
	register int com;
	int s;
	short stat;

#ifdef lint
	stat = unit; if (stat) return;
#endif
	com = com_addr[unit];
	s = splhigh();
	outb(com+com_cfcr, CFCR_DLAB);
	rate = ttspeedtab(comdefaultrate, comspeedtab);
	outb(com+com_data, rate & 0xFF);
	outb(com+com_ier, rate >> 8);
	outb(com+com_cfcr, CFCR_8BITS);
	outb(com+com_ier, IER_ERXRDY | IER_ETXRDY);
	outb(com+com_fifo, FIFO_ENABLE|FIFO_RCV_RST|FIFO_XMT_RST|FIFO_TRIGGER_4);
	stat = inb(com+com_iir);
	splx(s);
}

comcngetc(dev)
{
	register com = com_addr[UNIT(dev)];
	short stat;
	int c, s;

#ifdef lint
	stat = dev; if (stat) return(0);
#endif
	s = splhigh();
	while (((stat = inb(com+com_lsr)) & LSR_RXRDY) == 0)
		;
	c = inb(com+com_data);
	stat = inb(com+com_iir);
	splx(s);
	return(c);
}

/*
 * Console kernel output character routine.
 */
comcnputc(dev, c)
	dev_t dev;
	register int c;
{
	register com = com_addr[UNIT(dev)];
	register int timo;
	short stat;
	int s = splhigh();

#ifdef lint
	stat = dev; if (stat) return;
#endif
#ifdef KGDB
	if (dev != kgdb_dev)
#endif
	if (comconsinit == 0) {
		(void) cominit(UNIT(dev), comdefaultrate);
		comconsinit = 1;
	}
	/* wait for any pending transmission to finish */
	timo = 50000;
	while (((stat = inb(com+com_lsr)) & LSR_TXRDY) == 0 && --timo)
		;
	outb(com+com_data, c);
	/* wait for this transmission to complete */
	timo = 1500000;
	while (((stat = inb(com+com_lsr)) & LSR_TXRDY) == 0 && --timo)
		;
	/* clear any interrupts generated by this transmission */
	stat = inb(com+com_iir);
	splx(s);
}
#endif

int
comselect(dev, rw, p)
	dev_t dev;
	int rw;
	struct proc *p;
{
	register struct tty *tp = &com_tty[UNIT(dev)];
	int nread;
	int s = spltty();
        struct proc *selp;

	switch (rw) {

	case FREAD:
		nread = ttnread(tp);
		if (nread > 0 || 
		   ((tp->t_cflag&CLOCAL) == 0 && (tp->t_state&TS_CARR_ON) == 0))
			goto win;
		if (tp->t_rsel && (selp = pfind(tp->t_rsel)) && selp->p_wchan == (caddr_t)&selwait)
			tp->t_state |= TS_RCOLL;
		else
			tp->t_rsel = p->p_pid;
		break;

	case FWRITE:
		if (RB_LEN(&tp->t_out) <= tp->t_lowat)
			goto win;
		if (tp->t_wsel && (selp = pfind(tp->t_wsel)) && selp->p_wchan == (caddr_t)&selwait)
			tp->t_state |= TS_WCOLL;
		else
			tp->t_wsel = p->p_pid;
		break;
	}
	splx(s);
	return (0);
  win:
	splx(s);
	return (1);
}
Commit	Line	Data
15637ed4 RG	1	/*-
	2	* Copyright (c) 1991 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*
78ed81a3	33	* from: @(#)com.c 7.5 (Berkeley) 5/16/91
78ed81a3	34	* $Id$
15637ed4	35	*/
15637ed4 RG	36
	37	#include "com.h"
	38	#if NCOM > 0
	39	/*
	40	* COM driver, based on HP dca driver
	41	* uses National Semiconductor NS16450/NS16550AF UART
	42	*/
	43	#include "param.h"
	44	#include "systm.h"
	45	#include "ioctl.h"
	46	#include "tty.h"
	47	#include "proc.h"
	48	#include "user.h"
	49	#include "conf.h"
	50	#include "file.h"
	51	#include "uio.h"
	52	#include "kernel.h"
	53	#include "syslog.h"
	54
78ed81a3	55	#include "i386/isa/isa.h"
15637ed4 RG	56	#include "i386/isa/isa_device.h"
	57	#include "i386/isa/comreg.h"
	58	#include "i386/isa/ic/ns16550.h"
	59	#define cominor(d)
	60
	61	int comprobe(), comattach(), comintr(), comstart(), comparam();
	62
	63	struct isa_driver comdriver = {
	64	comprobe, comattach, "com"
	65	};
	66
	67	int comsoftCAR;
	68	int com_active;
	69	int com_hasfifo;
	70	int ncom = NCOM;
	71	#ifdef COMCONSOLE
	72	int comconsole = COMCONSOLE;
	73	#else
	74	int comconsole = -1;
	75	#endif
	76	int comconsinit;
	77	int comdefaultrate = TTYDEF_SPEED;
	78	int commajor;
	79	short com_addr[NCOM];
	80	struct tty com_tty[NCOM];
	81
	82	struct speedtab comspeedtab[] = {
	83	0, 0,
	84	50, COMBRD(50),
	85	75, COMBRD(75),
	86	110, COMBRD(110),
	87	134, COMBRD(134),
	88	150, COMBRD(150),
	89	200, COMBRD(200),
	90	300, COMBRD(300),
	91	600, COMBRD(600),
	92	1200, COMBRD(1200),
	93	1800, COMBRD(1800),
	94	2400, COMBRD(2400),
	95	4800, COMBRD(4800),
	96	9600, COMBRD(9600),
	97	19200, COMBRD(19200),
	98	38400, COMBRD(38400),
	99	57600, COMBRD(57600),
	100	-1, -1
	101	};
	102
	103	extern struct tty *constty;
	104	#ifdef KGDB
	105	#include "machine/remote-sl.h"
	106
	107	extern int kgdb_dev;
	108	extern int kgdb_rate;
	109	extern int kgdb_debug_init;
	110	#endif
	111
	112	#define UNIT(x) (minor(x))
	113
	114	comprobe(dev)
	115	struct isa_device *dev;
	116	{
	117	/* force access to id reg */
	118	outb(dev->id_iobase+com_cfcr, 0);
	119	outb(dev->id_iobase+com_iir, 0);
120	DELAY(100);
121	if ((inb(dev->id_iobase+com_iir) & 0x38) == 0)
78ed81a3	122	return(IO_COMSIZE);
15637ed4 RG	123	return(0);
	124	}
	125
	126
	127	int
	128	comattach(isdp)
	129	struct isa_device *isdp;
	130	{
	131	struct tty *tp;
	132	u_char unit;
	133	int port = isdp->id_iobase;
	134
	135	unit = isdp->id_unit;
	136	if (unit == comconsole)
	137	DELAY(1000);
	138	com_addr[unit] = port;
	139	com_active \|= 1 << unit;
	140	comsoftCAR \|= 1 << unit; /* XXX */
	141
	142	/* look for a NS 16550AF UART with FIFOs */
	143	outb(port+com_fifo, FIFO_ENABLE\|FIFO_RCV_RST\|FIFO_XMT_RST\|FIFO_TRIGGER_4);
	144	DELAY(100);
	145	if ((inb(port+com_iir) & IIR_FIFO_MASK) == IIR_FIFO_MASK) {
	146	com_hasfifo \|= 1 << unit;
78ed81a3	147	printf("com%d: fifo\n", unit);
15637ed4 RG	148	}
	149
	150	outb(port+com_ier, 0);
	151	outb(port+com_mcr, 0 \| MCR_IENABLE);
	152	#ifdef KGDB
	153	if (kgdb_dev == makedev(commajor, unit)) {
	154	if (comconsole == unit)
	155	kgdb_dev = -1; /* can't debug over console port */
	156	else {
	157	(void) cominit(unit, kgdb_rate);
	158	if (kgdb_debug_init) {
	159	/*
	160	* Print prefix of device name,
	161	* let kgdb_connect print the rest.
	162	*/
	163	printf("com%d: ", unit);
	164	kgdb_connect(1);
	165	} else
	166	printf("com%d: kgdb enabled\n", unit);
	167	}
	168	}
	169	#endif
	170	/*
	171	* Need to reset baud rate, etc. of next print so reset comconsinit.
	172	* Also make sure console is always "hardwired"
	173	*/
	174	if (unit == comconsole) {
	175	comconsinit = 0;
	176	comsoftCAR \|= (1 << unit);
	177	}
	178	return (1);
	179	}
	180
	181	/* ARGSUSED */
	182	comopen(dev_t dev, int flag, int mode, struct proc *p)
	183	{
	184	register struct tty *tp;
	185	register int unit;
	186	int error = 0;
	187
	188	unit = UNIT(dev);
	189	if (unit >= NCOM \|\| (com_active & (1 << unit)) == 0)
	190	return (ENXIO);
	191	tp = &com_tty[unit];
	192	tp->t_oproc = comstart;
	193	tp->t_param = comparam;
	194	tp->t_dev = dev;
	195	if ((tp->t_state & TS_ISOPEN) == 0) {
	196	tp->t_state \|= TS_WOPEN;
	197	ttychars(tp);
	198	if (tp->t_ispeed == 0) {
	199	tp->t_iflag = TTYDEF_IFLAG;
	200	tp->t_oflag = TTYDEF_OFLAG;
	201	tp->t_cflag = TTYDEF_CFLAG;
	202	tp->t_lflag = TTYDEF_LFLAG;
	203	tp->t_ispeed = tp->t_ospeed = comdefaultrate;
	204	}
	205	comparam(tp, &tp->t_termios);
	206	ttsetwater(tp);
	207	} else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0)
	208	return (EBUSY);
	209	(void) spltty();
	210	(void) commctl(dev, MCR_DTR \| MCR_RTS, DMSET);
	211	if ((comsoftCAR & (1 << unit)) \|\| (commctl(dev, 0, DMGET) & MSR_DCD))
212	tp->t_state \|= TS_CARR_ON;
213	while ((flag&O_NONBLOCK) == 0 && (tp->t_cflag&CLOCAL) == 0 &&
214	(tp->t_state & TS_CARR_ON) == 0) {
215	tp->t_state \|= TS_WOPEN;
216	if (error = ttysleep(tp, (caddr_t)&tp->t_raw, TTIPRI \| PCATCH,
217	ttopen, 0))
218	break;
219	}
220	(void) spl0();
221	if (error == 0)
222	error = (*linesw[tp->t_line].l_open)(dev, tp);
223	return (error);
224	}
225
226	/ARGSUSED/
227	comclose(dev, flag, mode, p)
228	dev_t dev;
229	int flag, mode;
230	struct proc *p;
231	{
232	register struct tty *tp;
233	register com;
234	register int unit;
235
236	unit = UNIT(dev);
237	com = com_addr[unit];
238	tp = &com_tty[unit];
239	(*linesw[tp->t_line].l_close)(tp, flag);
240	outb(com+com_cfcr, inb(com+com_cfcr) & ~CFCR_SBREAK);
241	#ifdef KGDB
242	/* do not disable interrupts if debugging */
243	if (kgdb_dev != makedev(commajor, unit))
244	#endif
245	outb(com+com_ier, 0);
246	if (tp->t_cflag&HUPCL \|\| tp->t_state&TS_WOPEN \|\|
247	(tp->t_state&TS_ISOPEN) == 0)
248	(void) commctl(dev, 0, DMSET);
249	ttyclose(tp);
250	return(0);
251	}
252
253	comread(dev, uio, flag)
254	dev_t dev;
255	struct uio *uio;
256	{
257	register struct tty *tp = &com_tty[UNIT(dev)];
258
259	return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
260	}
261
262	comwrite(dev, uio, flag)
263	dev_t dev;
264	struct uio *uio;
265	{
266	int unit = UNIT(dev);
267	register struct tty *tp = &com_tty[unit];
268
269	/*
270	* (XXX) We disallow virtual consoles if the physical console is
271	* a serial port. This is in case there is a display attached that
272	* is not the console. In that situation we don't need/want the X
273	* server taking over the console.
274	*/
275	if (constty && unit == comconsole)
276	constty = NULL;
277	return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
278	}
279
280	comintr(unit)
281	register int unit;
282	{
283	register com;
284	register u_char code;
285	register struct tty *tp;
286
287	unit;
288	com = com_addr[unit];
289	while (1) {
290	code = inb(com+com_iir);
291	switch (code & IIR_IMASK) {
292	case IIR_NOPEND:
293	return (1);
294	case IIR_RXTOUT:
295	case IIR_RXRDY:
296	tp = &com_tty[unit];
297	/*
298	* Process received bytes. Inline for speed...
299	*/
300	#ifdef KGDB
301	#define RCVBYTE() \
302	code = inb(com+com_data); \
303	if ((tp->t_state & TS_ISOPEN) == 0) { \
304	if (kgdb_dev == makedev(commajor, unit) && \
305	code == FRAME_END) \
306	kgdb_connect(0); /* trap into kgdb */ \
307	} else \
308	(*linesw[tp->t_line].l_rint)(code, tp)
309	#else
310	#define RCVBYTE() \
311	code = inb(com+com_data); \
312	if (tp->t_state & TS_ISOPEN) \
313	(*linesw[tp->t_line].l_rint)(code, tp)
314	#endif
315
316	RCVBYTE();
317
318	if (com_hasfifo & (1 << unit))
319	while ((code = inb(com+com_lsr)) & LSR_RCV_MASK) {
320	if (code == LSR_RXRDY) {
321	RCVBYTE();
322	} else
323	comeint(unit, code, com);
324	}
325	break;
326	case IIR_TXRDY:
327	tp = &com_tty[unit];
328	tp->t_state &=~ (TS_BUSY\|TS_FLUSH);
329	if (tp->t_line)
330	(*linesw[tp->t_line].l_start)(tp);
331	else
332	comstart(tp);
333	break;
334	case IIR_RLS:
335	comeint(unit, inb(com+com_lsr), com);
336	break;
337	default:
338	if (code & IIR_NOPEND)
339	return (1);
340	log(LOG_WARNING, "com%d: weird interrupt: 0x%x\n",
341	unit, code);
342	/* fall through */
343	case IIR_MLSC:
344	commint(unit, com);
345	break;
346	}
347	}
348	}
349
350	comeint(unit, stat, com)
351	register int unit, stat;
352	register com;
353	{
354	register struct tty *tp;
355	register int c;
356
357	tp = &com_tty[unit];
358	c = inb(com+com_data);
359	if ((tp->t_state & TS_ISOPEN) == 0) {
360	#ifdef KGDB
361	/* we don't care about parity errors */
362	if (((stat & (LSR_BI\|LSR_FE\|LSR_PE)) == LSR_PE) &&
363	kgdb_dev == makedev(commajor, unit) && c == FRAME_END)
364	kgdb_connect(0); /* trap into kgdb */
365	#endif
366	return;
367	}
368	if (stat & (LSR_BI \| LSR_FE))
369	c \|= TTY_FE;
370	else if (stat & LSR_PE)
371	c \|= TTY_PE;
372	else if (stat & LSR_OE) { /* 30 Aug 92*/
373	c \|= TTY_PE; /* Ought to have it's own define... */
374	log(LOG_WARNING, "com%d: silo overflow\n", unit);
375	}
376	(*linesw[tp->t_line].l_rint)(c, tp);
377	}
378
379	commint(unit, com)
380	register int unit;
381	register com;
382	{
383	register struct tty *tp;
384	register int stat;
385
386	tp = &com_tty[unit];
387	stat = inb(com+com_msr);
388	if ((stat & MSR_DDCD) && (comsoftCAR & (1 << unit)) == 0) {
389	if (stat & MSR_DCD)
390	(void)(*linesw[tp->t_line].l_modem)(tp, 1);
391	else if ((*linesw[tp->t_line].l_modem)(tp, 0) == 0)
392	outb(com+com_mcr,
393	inb(com+com_mcr) & ~(MCR_DTR \| MCR_RTS) \| MCR_IENABLE);
394	} else if ((stat & MSR_DCTS) && (tp->t_state & TS_ISOPEN) &&
78ed81a3	395	(tp->t_cflag & CRTSCTS)) {
15637ed4 RG	396	/* the line is up and we want to do rts/cts flow control */
	397	if (stat & MSR_CTS) {
	398	tp->t_state &=~ TS_TTSTOP;
	399	ttstart(tp);
	400	} else
	401	tp->t_state \|= TS_TTSTOP;
	402	}
	403	}
	404
	405	comioctl(dev, cmd, data, flag)
	406	dev_t dev;
	407	caddr_t data;
	408	{
	409	register struct tty *tp;
	410	register int unit = UNIT(dev);
	411	register com;
	412	register int error;
	413
	414	tp = &com_tty[unit];
	415	error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag);
	416	if (error >= 0)
	417	return (error);
	418	error = ttioctl(tp, cmd, data, flag);
	419	if (error >= 0)
	420	return (error);
	421
	422	com = com_addr[unit];
	423	switch (cmd) {
	424
	425	case TIOCSBRK:
	426	outb(com+com_cfcr, inb(com+com_cfcr) \| CFCR_SBREAK);
	427	break;
	428
	429	case TIOCCBRK:
	430	outb(com+com_cfcr, inb(com+com_cfcr) & ~CFCR_SBREAK);
	431	break;
	432
	433	case TIOCSDTR:
	434	(void) commctl(dev, MCR_DTR \| MCR_RTS, DMBIS);
	435	break;
	436
	437	case TIOCCDTR:
	438	(void) commctl(dev, MCR_DTR \| MCR_RTS, DMBIC);
	439	break;
	440
	441	case TIOCMSET:
	442	(void) commctl(dev, (int )data, DMSET);
	443	break;
	444
	445	case TIOCMBIS:
	446	(void) commctl(dev, (int )data, DMBIS);
	447	break;
	448
	449	case TIOCMBIC:
	450	(void) commctl(dev, (int )data, DMBIC);
	451	break;
	452
	453	case TIOCMGET:
	454	(int )data = commctl(dev, 0, DMGET);
	455	break;
	456
	457	default:
	458	return (ENOTTY);
	459	}
460	return (0);
461	}
462
463	comparam(tp, t)
464	register struct tty *tp;
465	register struct termios *t;
466	{
467	register com;
468	register int cfcr, cflag = t->c_cflag;
469	int unit = UNIT(tp->t_dev);
470	int ospeed = ttspeedtab(t->c_ospeed, comspeedtab);
471
472	/* check requested parameters */
473	if (ospeed < 0 \|\| (t->c_ispeed && t->c_ispeed != t->c_ospeed))
474	return(EINVAL);
475	/* and copy to tty */
476	tp->t_ispeed = t->c_ispeed;
477	tp->t_ospeed = t->c_ospeed;
478	tp->t_cflag = cflag;
479
480	com = com_addr[unit];
481	outb(com+com_ier, IER_ERXRDY \| IER_ETXRDY \| IER_ERLS /\| IER_EMSC/);
482	if (ospeed == 0) {
483	(void) commctl(unit, 0, DMSET); /* hang up line */
484	return(0);
485	}
486	outb(com+com_cfcr, inb(com+com_cfcr) \| CFCR_DLAB);
487	outb(com+com_data, ospeed & 0xFF);
488	outb(com+com_ier, ospeed >> 8);
489	switch (cflag&CSIZE) {
490	case CS5:
491	cfcr = CFCR_5BITS; break;
492	case CS6:
493	cfcr = CFCR_6BITS; break;
494	case CS7:
495	cfcr = CFCR_7BITS; break;
496	case CS8:
497	cfcr = CFCR_8BITS; break;
498	}
499	if (cflag&PARENB) {
500	cfcr \|= CFCR_PENAB;
501	if ((cflag&PARODD) == 0)
502	cfcr \|= CFCR_PEVEN;
503	}
504	if (cflag&CSTOPB)
505	cfcr \|= CFCR_STOPB;
506	outb(com+com_cfcr, cfcr);
507
508	if (com_hasfifo & (1 << unit))
509	outb(com+com_fifo, FIFO_ENABLE \| FIFO_TRIGGER_4);
510
511	return(0);
512	}
513
514	comstart(tp)
515	register struct tty *tp;
516	{
517	register com;
518	int s, unit, c;
519
520	unit = UNIT(tp->t_dev);
521	com = com_addr[unit];
522	s = spltty();
523	if (tp->t_state & (TS_TIMEOUT\|TS_TTSTOP))
524	goto out;
525	if (RB_LEN(&tp->t_out) <= tp->t_lowat) {
526	if (tp->t_state&TS_ASLEEP) {
527	tp->t_state &= ~TS_ASLEEP;
528	wakeup((caddr_t)&tp->t_out);
529	}
530	if (tp->t_wsel) {
531	selwakeup(tp->t_wsel, tp->t_state & TS_WCOLL);
532	tp->t_wsel = 0;
533	tp->t_state &= ~TS_WCOLL;
534	}
535	}
536	if (RB_LEN(&tp->t_out) == 0)
537	goto out;
538	if (inb(com+com_lsr) & LSR_TXRDY) {
539	c = getc(&tp->t_out);
540	tp->t_state \|= TS_BUSY;
541	outb(com+com_data, c);
542	if (com_hasfifo & (1 << unit))
543	for (c = 1; c < 16 && RB_LEN(&tp->t_out); ++c)
544	outb(com+com_data, getc(&tp->t_out));
545	}
546	out:
547	splx(s);
548	}
549
550	/*
551	* Stop output on a line.
552	*/
553	/ARGSUSED/
554	comstop(tp, flag)
555	register struct tty *tp;
556	{
557	register int s;
558
559	s = spltty();
560	if (tp->t_state & TS_BUSY) {
561	if ((tp->t_state&TS_TTSTOP)==0)
562	tp->t_state \|= TS_FLUSH;
563	}
564	splx(s);
565	}
566
567	commctl(dev, bits, how)
568	dev_t dev;
569	int bits, how;
570	{
571	register com;
572	register int unit;
573	int s;
574
575	unit = UNIT(dev);
576	com = com_addr[unit];
577	s = spltty();
578	switch (how) {
579
580	case DMSET:
581	outb(com+com_mcr, bits \| MCR_IENABLE);
582	break;
583
584	case DMBIS:
585	outb(com+com_mcr, inb(com+com_mcr) \| bits \| MCR_IENABLE);
586	break;
587
588	case DMBIC:
589	outb(com+com_mcr, inb(com+com_mcr) & ~bits \| MCR_IENABLE);
590	break;
591
592	case DMGET:
593	bits = inb(com+com_msr);
594	break;
595	}
596	(void) splx(s);
597	return(bits);
598	}
599
600	/*
601	* Following are all routines needed for COM to act as console
602	*/
603	#include "i386/i386/cons.h"
604
605	comcnprobe(cp)
606	struct consdev *cp;
607	{
608	int unit;
609
610	/* locate the major number */
611	for (commajor = 0; commajor < nchrdev; commajor++)
612	if (cdevsw[commajor].d_open == comopen)
613	break;
614
615	/* XXX: ick */
616	unit = CONUNIT;
617	com_addr[CONUNIT] = CONADDR;
618
619	/* make sure hardware exists? XXX */
620
621	/* initialize required fields */
622	cp->cn_dev = makedev(commajor, unit);
623	cp->cn_tp = &com_tty[unit];
624	#ifdef COMCONSOLE
625	cp->cn_pri = CN_REMOTE; /* Force a serial port console */
626	#else
627	cp->cn_pri = CN_NORMAL;
628	#endif
629	}
630
631	comcninit(cp)
632	struct consdev *cp;
633	{
634	int unit = UNIT(cp->cn_dev);
635
636	cominit(unit, comdefaultrate);
637	comconsole = unit;
638	comconsinit = 1;
639	}
640
641	cominit(unit, rate)
642	int unit, rate;
643	{
644	register int com;
645	int s;
646	short stat;
647
648	#ifdef lint
649	stat = unit; if (stat) return;
650	#endif
651	com = com_addr[unit];
652	s = splhigh();
653	outb(com+com_cfcr, CFCR_DLAB);
654	rate = ttspeedtab(comdefaultrate, comspeedtab);
655	outb(com+com_data, rate & 0xFF);
656	outb(com+com_ier, rate >> 8);
657	outb(com+com_cfcr, CFCR_8BITS);
658	outb(com+com_ier, IER_ERXRDY \| IER_ETXRDY);
659	outb(com+com_fifo, FIFO_ENABLE\|FIFO_RCV_RST\|FIFO_XMT_RST\|FIFO_TRIGGER_4);
660	stat = inb(com+com_iir);
661	splx(s);
662	}
663
664	comcngetc(dev)
665	{
666	register com = com_addr[UNIT(dev)];
667	short stat;
668	int c, s;
669
670	#ifdef lint
671	stat = dev; if (stat) return(0);
672	#endif
673	s = splhigh();
674	while (((stat = inb(com+com_lsr)) & LSR_RXRDY) == 0)
675	;
676	c = inb(com+com_data);
677	stat = inb(com+com_iir);
678	splx(s);
679	return(c);
680	}
681
682	/*
683	* Console kernel output character routine.
684	*/
685	comcnputc(dev, c)
686	dev_t dev;
687	register int c;
688	{
689	register com = com_addr[UNIT(dev)];
690	register int timo;
691	short stat;
692	int s = splhigh();
693
694	#ifdef lint
695	stat = dev; if (stat) return;
696	#endif
697	#ifdef KGDB
698	if (dev != kgdb_dev)
699	#endif
700	if (comconsinit == 0) {
701	(void) cominit(UNIT(dev), comdefaultrate);
702	comconsinit = 1;
703	}
704	/* wait for any pending transmission to finish */
705	timo = 50000;
706	while (((stat = inb(com+com_lsr)) & LSR_TXRDY) == 0 && --timo)
707	;
708	outb(com+com_data, c);
709	/* wait for this transmission to complete */
710	timo = 1500000;
711	while (((stat = inb(com+com_lsr)) & LSR_TXRDY) == 0 && --timo)
712	;
713	/* clear any interrupts generated by this transmission */
714	stat = inb(com+com_iir);
715	splx(s);
716	}
717	#endif
718
719	int
720	comselect(dev, rw, p)
721	dev_t dev;
722	int rw;
723	struct proc *p;
724	{
725	register struct tty *tp = &com_tty[UNIT(dev)];
726	int nread;
727	int s = spltty();
728	struct proc *selp;
729
730	switch (rw) {
731
732	case FREAD:
733	nread = ttnread(tp);
734	if (nread > 0 \|\|
735	((tp->t_cflag&CLOCAL) == 0 && (tp->t_state&TS_CARR_ON) == 0))
736	goto win;
737	if (tp->t_rsel && (selp = pfind(tp->t_rsel)) && selp->p_wchan == (caddr_t)&selwait)
738	tp->t_state \|= TS_RCOLL;
739	else
740	tp->t_rsel = p->p_pid;
741	break;
742
743	case FWRITE:
744	if (RB_LEN(&tp->t_out) <= tp->t_lowat)
745	goto win;
746	if (tp->t_wsel && (selp = pfind(tp->t_wsel)) && selp->p_wchan == (caddr_t)&selwait)
747	tp->t_state \|= TS_WCOLL;
748	else
749	tp->t_wsel = p->p_pid;
750	break;
751	}
752	splx(s);
753	return (0);
754	win:
755	splx(s);
756	return (1);
757	}