/*- * 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: sio.c,v 1.20 1993/12/16 04:38:27 ache Exp $ */ #include "sio.h" #if NSIO > 0 /* * Serial driver, based on 386BSD-0.1 com driver. * Mostly rewritten to use pseudo-DMA. * Works for National Semiconductor NS8250-NS16550AF UARTs. * COM driver, based on HP dca driver. */ #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 FAKE_DCD(unit) ((unit) == comconsole) #define LOTS_OF_EVENTS 64 /* helps separate urgent events from input */ #define RB_I_HIGH_WATER (RBSZ - 2 * RS_IBUFSIZE) #define RB_I_LOW_WATER ((RBSZ - 2 * RS_IBUFSIZE) * 7 / 8) #define RS_IBUFSIZE 256 #define TTY_BI TTY_FE /* XXX */ #define TTY_OE TTY_PE /* XXX */ #ifndef COM_BIDIR #define UNIT(x) (minor(x)) /* XXX */ #else /* COM_BIDIR */ #define COM_UNITMASK 0x7f #define COM_CALLOUTMASK 0x80 #define UNIT(x) (minor(x) & COM_UNITMASK) #define CALLOUT(x) (minor(x) & COM_CALLOUTMASK) #endif /* COM_BIDIR */ #ifdef COM_MULTIPORT /* checks in flags for multiport and which is multiport "master chip" * for a given card */ #define COM_ISMULTIPORT(dev) ((dev)->id_flags & 0x01) #define COM_MPMASTER(dev) (((dev)->id_flags >> 8) & 0x0ff) #endif /* COM_MULTIPORT */ #define com_scr 7 /* scratch register for 16450-16550 (R/W) */ #define schedsoftcom() (ipending |= 1 << 4) /* XXX */ /* * Input buffer watermarks. * The external device is asked to stop sending when the buffer exactly reaches * high water, or when the high level requests it. * The high level is notified immediately (rather than at a later clock tick) * when this watermark is reached. * The buffer size is chosen so the watermark should almost never be reached. * The low watermark is invisibly 0 since the buffer is always emptied all at * once. */ #define RS_IHIGHWATER (3 * RS_IBUFSIZE / 4) /* * com state bits. * (CS_BUSY | CS_TTGO) and (CS_BUSY | CS_TTGO | CS_ODEVREADY) must be higher * than the other bits so that they can be tested as a group without masking * off the low bits. * * The following com and tty flags correspond closely: * TS_BUSY = CS_BUSY (maintained by comstart() and comflush()) * CS_TTGO = ~TS_TTSTOP (maintained by comstart() and siostop()) * CS_CTS_OFLOW = CCTS_OFLOW (maintained by comparam()) * CS_RTS_IFLOW = CRTS_IFLOW (maintained by comparam()) * TS_FLUSH is not used. * Bug: I think TIOCSETA doesn't clear TS_TTSTOP when it clears IXON. */ #define CS_BUSY 0x80 /* output in progress */ #define CS_TTGO 0x40 /* output not stopped by XOFF */ #define CS_ODEVREADY 0x20 /* external device h/w ready (CTS) */ #define CS_CHECKMSR 1 /* check of MSR scheduled */ #define CS_CTS_OFLOW 2 /* use CTS output flow control */ #define CS_ODONE 4 /* output completed */ #define CS_RTS_IFLOW 8 /* use RTS input flow control */ static char *error_desc[] = { #define CE_OVERRUN 0 "silo overflow", #define CE_INTERRUPT_BUF_OVERFLOW 1 "interrupt-level buffer overflow", #define CE_TTY_BUF_OVERFLOW 2 "tty-level buffer overflow", }; #define CE_NTYPES 3 #define CE_RECORD(com, errnum) (++(com)->delta_error_counts[errnum]) /* types. XXX - should be elsewhere */ typedef u_int Port_t; /* hardware port */ typedef int Bool_t; /* promoted boolean */ typedef u_char bool_t; /* boolean */ /* com device structure */ struct com_s { u_char state; /* miscellaneous flag bits */ u_char cfcr_image; /* copy of value written to CFCR */ bool_t hasfifo; /* nonzero for 16550 UARTs */ u_char mcr_image; /* copy of value written to MCR */ #ifdef COM_BIDIR bool_t bidir; /* is this unit bidirectional? */ bool_t active; /* is the port active _at all_? */ bool_t active_in; /* is the incoming port in use? */ bool_t active_out; /* is the outgoing port in use? */ #endif /* COM_BIDIR */ #ifdef COM_MULTIPORT bool_t multiport; /* is this unit part of a multiport device? */ #endif /* COM_MULTIPORT */ int dtr_wait; /* time to hold DTR down on close (* 1/HZ) */ /* * The high level of the driver never reads status registers directly * because there would be too many side effects to handle conveniently. * Instead, it reads copies of the registers stored here by the * interrupt handler. */ u_char last_modem_status; /* last MSR read by intr handler */ u_char prev_modem_status; /* last MSR handled by high level */ u_char *ibuf; /* start of input buffer */ u_char *ibufend; /* end of input buffer */ u_char *ihighwater; /* threshold in input buffer */ u_char *iptr; /* next free spot in input buffer */ u_char *obufend; /* end of output buffer */ int ocount; /* original count for current output */ u_char *optr; /* next char to output */ Port_t data_port; /* i/o ports */ Port_t int_id_port; Port_t iobase; Port_t modem_ctl_port; Port_t line_status_port; Port_t modem_status_port; struct tty *tp; /* cross reference */ u_long bytes_in; /* statistics */ u_long bytes_out; u_int delta_error_counts[CE_NTYPES]; u_int error_counts[CE_NTYPES]; /* * Ping-pong input buffers. The extra factor of 2 in the sizes is * to allow for an error byte for each input byte. */ #define CE_INPUT_OFFSET RS_IBUFSIZE u_char ibuf1[2 * RS_IBUFSIZE]; u_char ibuf2[2 * RS_IBUFSIZE]; }; /* * These functions in the com module ought to be declared (with a prototype) * in a com-driver system header. The void ones may need to be int to match * ancient devswitch declarations, but they don't actually return anything. */ #define Dev_t int /* promoted dev_t */ struct consdev; int sioclose __P((Dev_t dev, int fflag, int devtype, struct proc *p)); void siointr __P((int unit)); int sioioctl __P((Dev_t dev, int cmd, caddr_t data, int fflag, struct proc *p)); int siocngetc __P((Dev_t dev)); void siocninit __P((struct consdev *cp)); void siocnprobe __P((struct consdev *cp)); void siocnputc __P((Dev_t dev, int c)); int sioopen __P((Dev_t dev, int oflags, int devtype, struct proc *p)); /* * Also, most of the device switch functions are still declared old-style * so they take a Dev_t arg and shorten it to a dev_t. It would be simpler * and faster if dev_t's were always promoted (to ints or whatever) as * early as possible. */ int sioread __P((Dev_t dev, struct uio *uio, int ioflag)); int sioselect __P((Dev_t dev, int rw, struct proc *p)); void siostop __P((struct tty *tp, int rw)); int siowrite __P((Dev_t dev, struct uio *uio, int ioflag)); void softsio1 __P((void)); static int sioattach __P((struct isa_device *dev)); static void comflush __P((struct com_s *com)); static void comhardclose __P((struct com_s *com)); static void cominit __P((int unit, int rate)); #ifdef COM_MULTIPORT static bool_t comintr1 __P((struct com_s *com)); #endif /* COM_MULTIPORT */ static int commctl __P((struct com_s *com, int bits, int how)); static int comparam __P((struct tty *tp, struct termios *t)); static int sioprobe __P((struct isa_device *dev)); static void compoll __P((void)); static void comstart __P((struct tty *tp)); static void comwakeup __P((caddr_t chan, int ticks)); static int tiocm_xxx2mcr __P((int tiocm_xxx)); /* table and macro for fast conversion from a unit number to its com struct */ static struct com_s *p_com_addr[NSIO]; #define com_addr(unit) (p_com_addr[unit]) static struct com_s com_structs[NSIO]; struct isa_driver siodriver = { sioprobe, sioattach, "sio" }; #ifdef COMCONSOLE static int comconsole = COMCONSOLE; #else static int comconsole = -1; #endif static bool_t comconsinit; static speed_t comdefaultrate = TTYDEF_SPEED; static u_int com_events; /* input chars + weighted output completions */ static int commajor; struct tty sio_tty[NSIO]; extern struct tty *constty; extern u_int ipending; /* XXX */ extern int tk_nin; /* XXX */ extern int tk_rawcc; /* XXX */ #ifdef KGDB #include "machine/remote-sl.h" extern int kgdb_dev; extern int kgdb_rate; extern int kgdb_debug_init; #endif static 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), 115200, COMBRD(115200), -1, -1 }; /* XXX - configure this list */ static Port_t likely_com_ports[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, }; static int sioprobe(dev) struct isa_device *dev; { static bool_t already_init; Port_t *com_ptr; Port_t iobase; int result; if (!already_init) { /* * Turn off MCR_IENABLE for all likely serial ports. An unused * port with its MCR_IENABLE gate open will inhibit interrupts * from any used port that shares the interrupt vector. */ for (com_ptr = likely_com_ports; com_ptr < &likely_com_ports[sizeof likely_com_ports / sizeof likely_com_ports[0]]; ++com_ptr) outb(*com_ptr + com_mcr, 0); already_init = TRUE; } iobase = dev->id_iobase; result = 1; /* * We don't want to get actual interrupts, just masked ones. * Interrupts from this line should already be masked in the ICU, * but mask them in the processor as well in case there are some * (misconfigured) shared interrupts. */ disable_intr(); /* * Enable output interrupts (only) and check the following: * o the CFCR, IER and MCR in UART hold the values written to them * (the values happen to be all distinct - this is good for * avoiding false positive tests from bus echoes). * o an output interrupt is generated and its vector is correct. * o the interrupt goes away when the IIR in the UART is read. */ outb(iobase + com_cfcr, CFCR_DLAB); /* DLAB = 1 */ outb(iobase + com_dlbl, COMBRD(9600) & 0xff); /* 9600bps */ outb(iobase + com_dlbh, ((u_int) COMBRD(9600) >> 8) & 0xff); outb(iobase + com_cfcr, CFCR_8BITS); /* ensure IER is addressed */ outb(iobase + com_mcr, MCR_IENABLE); /* open gate early */ outb(iobase + com_ier, 0); /* ensure edge on next intr */ outb(iobase + com_ier, IER_ETXRDY); /* generate interrupt */ DELAY(17000); /* wait for fifo drain on 9600 */ if ( inb(iobase + com_cfcr) != CFCR_8BITS || inb(iobase + com_ier) != IER_ETXRDY || inb(iobase + com_mcr) != MCR_IENABLE #ifndef COM_MULTIPORT /* XXX - need to do more to enable interrupts */ || !isa_irq_pending(dev) #endif || (inb(iobase + com_iir) & IIR_IMASK) != IIR_TXRDY || isa_irq_pending(dev) || (inb(iobase + com_iir) & IIR_IMASK) != IIR_NOPEND) result = 0; /* * Turn off all device interrupts and check that they go off properly. * Leave MCR_IENABLE set. It gates the OUT2 output of the UART to * the ICU input. Closing the gate would give a floating ICU input * (unless there is another device driving at) and spurious interrupts. * (On the system that this was first tested on, the input floats high * and gives a (masked) interrupt as soon as the gate is closed.) */ outb(iobase + com_ier, 0); outb(iobase + com_mcr, MCR_IENABLE); /* dummy to avoid bus echo */ if ( inb(iobase + com_ier) != 0 || isa_irq_pending(dev) || (inb(iobase + com_iir) & IIR_IMASK) != IIR_NOPEND) result = 0; enable_intr(); return (result); } static int /* XXX - should be void */ sioattach(isdp) struct isa_device *isdp; { struct com_s *com; static bool_t comwakeup_started = FALSE; Port_t iobase; int s; int unit; iobase = isdp->id_iobase; unit = isdp->id_unit; if (unit == comconsole) DELAY(1000); /* XXX */ s = spltty(); /* * sioprobe() has initialized the device registers as follows: * o cfcr = CFCR_8BITS. * It is most important that CFCR_DLAB is off, so that the * data port is not hidden when we enable interrupts. * o ier = 0. * Interrupts are only enabled when the line is open. * o mcr = MCR_IENABLE. * Keeping MCR_DTR and MCR_RTS off might stop the external * device from sending before we are ready. */ com = &com_structs[unit]; com->cfcr_image = CFCR_8BITS; com->mcr_image = MCR_IENABLE; com->dtr_wait = 200; com->iptr = com->ibuf = com->ibuf1; com->ibufend = com->ibuf1 + RS_IBUFSIZE; com->ihighwater = com->ibuf1 + RS_IHIGHWATER; com->iobase = iobase; com->data_port = iobase + com_data; com->int_id_port = iobase + com_iir; com->modem_ctl_port = iobase + com_mcr; com->line_status_port = iobase + com_lsr; com->modem_status_port = iobase + com_msr; com->tp = &sio_tty[unit]; #ifdef COM_BIDIR /* * if bidirectional ports possible, clear the bidir port info; */ com->bidir = FALSE; com->active = FALSE; com->active_in = com->active_out = FALSE; #endif /* COM_BIDIR */ /* attempt to determine UART type */ printf("sio%d: type", unit); #ifdef COM_MULTIPORT if (!COM_ISMULTIPORT(isdp)) #endif { u_char scr; u_char scr1; u_char scr2; scr = inb(iobase + com_scr); outb(iobase + com_scr, 0xa5); scr1 = inb(iobase + com_scr); outb(iobase + com_scr, 0x5a); scr2 = inb(iobase + com_scr); outb(iobase + com_scr, scr); if (scr1 != 0xa5 || scr2 != 0x5a) { printf(" <8250>"); goto determined_type; } } outb(iobase + com_fifo, FIFO_ENABLE | FIFO_TRIGGER_14); DELAY(100); switch (inb(iobase + com_iir) & IIR_FIFO_MASK) { case FIFO_TRIGGER_1: printf(" <16450>"); break; case FIFO_TRIGGER_4: printf(" <16450?>"); break; case FIFO_TRIGGER_8: printf(" <16550?>"); break; case FIFO_TRIGGER_14: com->hasfifo = TRUE; printf(" <16550A>"); break; } outb(iobase + com_fifo, 0); determined_type: ; #ifdef COM_MULTIPORT if (COM_ISMULTIPORT(isdp)) { struct isa_device *masterdev; com->multiport = TRUE; printf(" (multiport)"); /* set the master's common-interrupt-enable reg., * as appropriate. YYY See your manual */ /* enable only common interrupt for port */ outb(iobase + com_mcr, 0); masterdev = find_isadev(isa_devtab_tty, &siodriver, COM_MPMASTER(isdp)); outb(masterdev->id_iobase+com_scr, 0x80); } else com->multiport = FALSE; #endif /* COM_MULTIPORT */ printf("\n"); #ifdef KGDB if (kgdb_dev == makedev(commajor, unit)) { if (comconsole == unit) kgdb_dev = -1; /* can't debug over console port */ else { cominit(unit, kgdb_rate); if (kgdb_debug_init) { /* * Print prefix of device name, * let kgdb_connect print the rest. */ printf("sio%d: ", unit); kgdb_connect(1); } else printf("sio%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 = FALSE; com_addr(unit) = com; splx(s); if (!comwakeup_started) { comwakeup((caddr_t) NULL, 0); comwakeup_started = TRUE; } return (1); } /* ARGSUSED */ int sioopen(dev, flag, mode, p) dev_t dev; int flag; int mode; struct proc *p; { struct com_s *com; int error = 0; Port_t iobase; int s; struct tty *tp; int unit = UNIT(dev); #ifdef COM_BIDIR bool_t callout = CALLOUT(dev); #endif /* COM_BIDIR */ if ((u_int) unit >= NSIO || (com = com_addr(unit)) == NULL) return (ENXIO); #ifdef COM_BIDIR /* if it's a callout device, and bidir not possible on that dev, die */ if (callout && !(com->bidir)) return (ENXIO); #endif /* COM_BIDIR */ tp = com->tp; s = spltty(); #ifdef COM_BIDIR bidir_open_top: /* if it's bidirectional, we've gotta deal with it... */ if (com->bidir) { if (callout) { if (com->active_in) { /* it's busy. die */ splx(s); return (EBUSY); } else { /* it's ours. lock it down, and set it up */ com->active_out = TRUE; } } else { if (com->active_out) { /* it's busy, outgoing. wait, if possible */ if (flag & O_NONBLOCK) { /* can't wait; bail */ splx(s); return (EBUSY); } else { /* wait for it... */ error = tsleep((caddr_t)&com->active_out, TTIPRI|PCATCH, "siooth", 0); /* if there was an error, take off. */ if (error != 0) { splx(s); return (error); } /* else take it from the top */ goto bidir_open_top; } } else if (com->prev_modem_status & MSR_DCD || FAKE_DCD(unit)) { /* there's a carrier on the line; we win */ com->active_in = TRUE; } else { /* there is no carrier on the line */ if (flag & O_NONBLOCK) { /* can't wait; let it open */ com->active_in = TRUE; } else { /* put DTR & RTS up */ /* NOTE: cgd'sdriver used the ier register * to enable/disable interrupts. This one * uses both ier and IENABLE in the mcr. */ /* XXX - bring up RTS earlier? */ (void) commctl(com, MCR_DTR | MCR_RTS, DMSET); outb(com->iobase + com_ier, IER_EMSC); /* wait for it... */ error = tsleep((caddr_t)&com->active_in, TTIPRI|PCATCH, "siodcd", 0); /* if not active, turn DTR off */ if (!com->active) (void) commctl(com, MCR_DTR, DMBIC); /* if there was an error, take off. */ if (error != 0) { splx(s); return (error); } /* else take it from the top */ goto bidir_open_top; } } } } com->active = TRUE; #endif /* COM_BIDIR */ tp->t_oproc = comstart; tp->t_param = comparam; tp->t_dev = dev; if (!(tp->t_state & TS_ISOPEN)) { tp->t_state |= TS_WOPEN; ttychars(tp); if (tp->t_ispeed == 0) { /* * We no longer use the flags from * since those are only relevant for logins. It's * important to have echo off initially so that the * line doesn't start blathering before the echo flag * can be turned off. It's useful to have clocal on * initially so that "stty changed-defaults t_iflag = 0; #ifdef COMCONSOLE tp->t_oflag = TTYDEF_OFLAG; #else tp->t_oflag = 0; #endif tp->t_cflag = CREAD | CS8 | CLOCAL; tp->t_lflag = 0; tp->t_ispeed = tp->t_ospeed = comdefaultrate; } #ifdef COM_BIDIR if (com->bidir) { if (callout) tp->t_cflag |= CLOCAL; else tp->t_cflag &= ~CLOCAL; tp->t_cflag |= HUPCL; } #endif (void) commctl(com, MCR_DTR | MCR_RTS, DMSET); error = comparam(tp, &tp->t_termios); if (error != 0) goto out; ttsetwater(tp); iobase = com->iobase; disable_intr(); if (com->hasfifo) /* (re)enable and drain FIFO */ outb(iobase + com_fifo, FIFO_ENABLE | FIFO_TRIGGER_14 | FIFO_RCV_RST | FIFO_XMT_RST); (void) inb(com->line_status_port); (void) inb(com->data_port); com->last_modem_status = com->prev_modem_status = inb(com->modem_status_port); outb(iobase + com_ier, IER_ERXRDY | IER_ETXRDY | IER_ERLS | IER_EMSC); enable_intr(); if (com->prev_modem_status & MSR_DCD || FAKE_DCD(unit)) tp->t_state |= TS_CARR_ON; } else if (tp->t_state & TS_XCLUDE && p->p_ucred->cr_uid != 0) { splx(s); return (EBUSY); } while (!(flag & O_NONBLOCK) && !(tp->t_cflag & CLOCAL) #ifdef COM_BIDIR /* We went through a lot of trouble to open it, * but it's certain we have a carrier now, so * don't spend any time on it now. */ && !(com->bidir) #endif /* COM_BIDIR */ && !(tp->t_state & TS_CARR_ON)) { tp->t_state |= TS_WOPEN; error = ttysleep(tp, (caddr_t)&tp->t_raw, TTIPRI | PCATCH, ttopen, 0); if (error != 0) break; } out: splx(s); if (error == 0) error = (*linesw[tp->t_line].l_open)(dev, tp, 0); #ifdef COM_BIDIR /* wakeup sleepers */ wakeup((caddr_t) &com->active_in); #endif /* COM_BIDIR */ /* * XXX - the next step was once not done, so interrupts, DTR and RTS * remained hot if the process was killed while it was sleeping * waiting for carrier. Now there is the opposite problem. If several * processes are sleeping waiting for carrier on the same line and one * is killed, interrupts are turned off so the other processes will * never see the carrier rise. */ if (error != 0 && !(tp->t_state & TS_ISOPEN)) comhardclose(com); tp->t_state &= ~TS_WOPEN; return (error); } /*ARGSUSED*/ int sioclose(dev, flag, mode, p) dev_t dev; int flag; int mode; struct proc *p; { struct com_s *com; struct tty *tp; com = com_addr(UNIT(dev)); tp = com->tp; (*linesw[tp->t_line].l_close)(tp, flag); comhardclose(com); ttyclose(tp); return (0); } static void comhardclose(com) struct com_s *com; { Port_t iobase; int s; struct tty *tp; s = spltty(); iobase = com->iobase; outb(iobase + com_cfcr, com->cfcr_image &= ~CFCR_SBREAK); #ifdef KGDB /* do not disable interrupts if debugging */ if (kgdb_dev != makedev(commajor, com - &com_structs[0])) #endif outb(iobase + com_ier, 0); tp = com->tp; if (tp->t_cflag & HUPCL || tp->t_state & TS_WOPEN || !(tp->t_state & TS_ISOPEN)) { (void) commctl(com, MCR_RTS, DMSET); if (com->dtr_wait != 0) /* uninterruptible since we want to wait a fixed time */ tsleep((caddr_t)&com->dtr_wait, TTIPRI, "sioclose", com->dtr_wait); } #ifdef COM_BIDIR com->active = com->active_in = com->active_out = FALSE; /* wakeup sleepers who are waiting for out to finish */ wakeup((caddr_t) &com->active_out); #endif /* COM_BIDIR */ splx(s); } int sioread(dev, uio, flag) dev_t dev; struct uio *uio; int flag; { struct tty *tp = com_addr(UNIT(dev))->tp; return ((*linesw[tp->t_line].l_read)(tp, uio, flag)); } int siowrite(dev, uio, flag) dev_t dev; struct uio *uio; int flag; { int unit = UNIT(dev); struct tty *tp = com_addr(unit)->tp; /* * (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)); } void siointr(unit) int unit; { struct com_s *com; #ifndef COM_MULTIPORT u_char line_status; u_char modem_status; u_char *ioptr; u_char recv_data; com = com_addr(unit); #else /* COM_MULTIPORT */ int i; bool_t donesomething; /* * Loop until there is no activity on any port. This is necessary * to get an interrupt edge more than to avoid another interrupt. * If the IRQ signal is just an OR of the IRQ signals from several * devices, then the edge from one may be lost because another is * on, or it may cause a stray interrupt because another was on a * short time before. * * XXX getting the status from comintr1() is not best and may be * incorrect. It would be better to test the int_id's in a tight * loop. If each is off when it is tested, then they all must * have been off at the start. */ do { donesomething = FALSE; for(i=0;iline_status_port); /* input event? (check first to help avoid overruns) */ while (line_status & LSR_RCV_MASK) { /* break/unnattached error bits or real input? */ #ifdef COM_MULTIPORT donesomething = TRUE; #endif /* COM_MULTIPORT */ if (!(line_status & LSR_RXRDY)) recv_data = 0; else recv_data = inb(com->data_port); ++com->bytes_in; #ifdef KGDB /* trap into kgdb? (XXX - needs testing and optim) */ if (recv_data == FRAME_END && !(com->tp->t_state & TS_ISOPEN) && kgdb_dev == makedev(commajor, unit)) { kgdb_connect(0); continue; } #endif /* KGDB */ ioptr = com->iptr; if (ioptr >= com->ibufend) CE_RECORD(com, CE_INTERRUPT_BUF_OVERFLOW); else { ++com_events; ioptr[0] = recv_data; ioptr[CE_INPUT_OFFSET] = line_status; com->iptr = ++ioptr; if (ioptr == com->ihighwater && com->state & CS_RTS_IFLOW) outb(com->modem_ctl_port, com->mcr_image &= ~MCR_RTS); /* XXX - move this out of isr */ if (line_status & LSR_OE) CE_RECORD(com, CE_OVERRUN); } /* * "& 0x7F" is to avoid the gcc-1.40 generating a slow * jump from the top of the loop to here */ line_status = inb(com->line_status_port) & 0x7F; } /* modem status change? (always check before doing output) */ modem_status = inb(com->modem_status_port); if (modem_status != com->last_modem_status) { /* * Schedule high level to handle DCD changes. Note * that we don't use the delta bits anywhere. Some * UARTs mess them up, and it's easy to remember the * previous bits and calculate the delta. */ #ifdef COM_MULTIPORT donesomething = TRUE; #endif /* COM_MULTIPORT */ com->last_modem_status = modem_status; if (!(com->state & CS_CHECKMSR)) { com_events += LOTS_OF_EVENTS; com->state |= CS_CHECKMSR; schedsoftcom(); } /* handle CTS change immediately for crisp flow ctl */ if (com->state & CS_CTS_OFLOW) { if (modem_status & MSR_CTS) com->state |= CS_ODEVREADY; else com->state &= ~CS_ODEVREADY; } } /* output queued and everything ready? */ if (line_status & LSR_TXRDY && com->state >= (CS_ODEVREADY | CS_BUSY | CS_TTGO)) { #ifdef COM_MULTIPORT donesomething = TRUE; #endif /* COM_MULTIPORT */ ioptr = com->optr; outb(com->data_port, *ioptr); ++com->bytes_out; com->optr = ++ioptr; if (ioptr >= com->obufend) { /* output just completed */ com_events += LOTS_OF_EVENTS; com->state ^= (CS_ODONE | CS_BUSY); schedsoftcom(); /* handle at high level ASAP */ } } /* finished? */ if ((inb(com->int_id_port) & IIR_IMASK) == IIR_NOPEND) #ifdef COM_MULTIPORT return (donesomething); #else return; #endif /* COM_MULTIPORT */ } } static int tiocm_xxx2mcr(tiocm_xxx) int tiocm_xxx; { int mcr; mcr = 0; if (tiocm_xxx & TIOCM_DTR) mcr |= MCR_DTR; if (tiocm_xxx & TIOCM_RTS) mcr |= MCR_RTS; return (mcr); } int sioioctl(dev, cmd, data, flag, p) dev_t dev; int cmd; caddr_t data; int flag; struct proc *p; { struct com_s *com; int error; Port_t iobase; int mcr; int msr; int s; int tiocm_xxx; struct tty *tp; com = com_addr(UNIT(dev)); tp = com->tp; 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); iobase = com->iobase; s = spltty(); #ifdef COM_BIDIR /* XXX: plug security hole while stucky bits not yet implemented */ if (com->bidir && com->active_in && p->p_ucred->cr_uid != 0) { tp->t_cflag |= HUPCL; tp->t_cflag &= ~CLOCAL; } #endif switch (cmd) { case TIOCSBRK: outb(iobase + com_cfcr, com->cfcr_image |= CFCR_SBREAK); break; case TIOCCBRK: outb(iobase + com_cfcr, com->cfcr_image &= ~CFCR_SBREAK); break; case TIOCSDTR: (void) commctl(com, MCR_DTR, DMBIS); break; case TIOCCDTR: (void) commctl(com, MCR_DTR, DMBIC); break; case TIOCMSET: (void) commctl(com, tiocm_xxx2mcr(*(int *)data), DMSET); break; case TIOCMBIS: (void) commctl(com, tiocm_xxx2mcr(*(int *)data), DMBIS); break; case TIOCMBIC: (void) commctl(com, tiocm_xxx2mcr(*(int *)data), DMBIC); break; case TIOCMGET: tiocm_xxx = TIOCM_LE; /* XXX - always enabled while open */ mcr = com->mcr_image; if (mcr & MCR_DTR) tiocm_xxx |= TIOCM_DTR; if (mcr & MCR_RTS) tiocm_xxx |= TIOCM_RTS; msr = com->prev_modem_status; if (msr & MSR_CTS) tiocm_xxx |= TIOCM_CTS; if (msr & MSR_DCD) tiocm_xxx |= TIOCM_CD; if (msr & MSR_DSR) tiocm_xxx |= TIOCM_DSR; /* XXX - MSR_TERI is too volatile. */ if (msr & (MSR_RI | MSR_TERI)) tiocm_xxx |= TIOCM_RI; *(int *)data = tiocm_xxx; break; #ifdef COM_BIDIR case TIOCMSBIDIR: /* must be root to set bidir. capability */ if (p->p_ucred->cr_uid != 0) return(EPERM); /* if it's the console, can't do it */ if (UNIT(dev) == comconsole) return(ENOTTY); /* can't do the next, for obvious reasons... * but there are problems to be looked at... */ /* if the port is active, don't do it */ /* if (com->active) return(EBUSY); */ com->bidir = *(int *)data; break; case TIOCMGBIDIR: *(int *)data = com->bidir; break; #endif /* COM_BIDIR */ case TIOCMSDTRWAIT: /* must be root (XXX why?) */ if (p->p_ucred->cr_uid != 0) return(EPERM); /* if it's the console, can't do it (XXX why?) */ if (UNIT(dev) == comconsole) return(ENOTTY); com->dtr_wait = *(int *)data; break; case TIOCMGDTRWAIT: *(int *)data = com->dtr_wait; break; default: splx(s); return (ENOTTY); } splx(s); return (0); } /* cancel pending output */ static void comflush(com) struct com_s *com; { struct ringb *rbp; disable_intr(); if (com->state & CS_ODONE) com_events -= LOTS_OF_EVENTS; com->state &= ~(CS_ODONE | CS_BUSY); enable_intr(); rbp = &com->tp->t_out; rbp->rb_hd += com->ocount; rbp->rb_hd = RB_ROLLOVER(rbp, rbp->rb_hd); com->ocount = 0; com->tp->t_state &= ~TS_BUSY; } static void compoll() { static bool_t awake = FALSE; struct com_s *com; int s; int unit; if (com_events == 0) return; disable_intr(); if (awake) { enable_intr(); return; } awake = TRUE; enable_intr(); s = spltty(); repeat: for (unit = 0; unit < NSIO; ++unit) { u_char *buf = 0; u_char *ibuf; int incc; struct tty *tp; com = com_addr(unit); if (com == NULL) continue; tp = com->tp; /* switch the role of the low-level input buffers */ if (com->iptr == (ibuf = com->ibuf)) incc = 0; else { buf = ibuf; disable_intr(); incc = com->iptr - buf; com_events -= incc; if (ibuf == com->ibuf1) ibuf = com->ibuf2; else ibuf = com->ibuf1; com->ibufend = ibuf + RS_IBUFSIZE; com->ihighwater = ibuf + RS_IHIGHWATER; com->iptr = ibuf; /* * There is now room for another low-level buffer full * of input, so enable RTS if it is now disabled and * there is room in the high-level buffer. */ if (!(com->mcr_image & MCR_RTS) && !(tp->t_state & TS_RTS_IFLOW)) outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS); enable_intr(); com->ibuf = ibuf; } if (com->state & CS_CHECKMSR) { u_char delta_modem_status; disable_intr(); delta_modem_status = com->last_modem_status ^ com->prev_modem_status; com->prev_modem_status = com->last_modem_status; com_events -= LOTS_OF_EVENTS; com->state &= ~CS_CHECKMSR; enable_intr(); if (delta_modem_status & MSR_DCD && !FAKE_DCD(unit)) { if (com->prev_modem_status & MSR_DCD) { (*linesw[tp->t_line].l_modem)(tp, 1); #ifdef COM_BIDIR wakeup((caddr_t) &com->active_in); #endif /* COM_BIDIR */ } else (*linesw[tp->t_line].l_modem)(tp, 0); } } /* XXX */ if (TRUE) { u_int delta; u_int delta_error_counts[CE_NTYPES]; int errnum; u_long total; disable_intr(); bcopy(com->delta_error_counts, delta_error_counts, sizeof delta_error_counts); bzero(com->delta_error_counts, sizeof delta_error_counts); enable_intr(); for (errnum = 0; errnum < CE_NTYPES; ++errnum) { delta = delta_error_counts[errnum]; if (delta != 0) { total = com->error_counts[errnum] += delta; log(LOG_WARNING, "sio%d: %u more %s%s (total %lu)\n", unit, delta, error_desc[errnum], delta == 1 ? "" : "s", total); } } } if (com->state & CS_ODONE) { comflush(com); /* XXX - why isn't the table used for t_line == 0? */ if (tp->t_line != 0) (*linesw[tp->t_line].l_start)(tp); else comstart(tp); } if (incc <= 0 || !(tp->t_state & TS_ISOPEN)) continue; if (com->state & CS_RTS_IFLOW && RB_LEN(&tp->t_raw) + incc >= RB_I_HIGH_WATER && !(tp->t_state & TS_RTS_IFLOW) /* * XXX - need RTS flow control for all line disciplines. * Only have it in standard one now. */ && linesw[tp->t_line].l_rint == ttyinput) { tp->t_state |= TS_RTS_IFLOW; ttstart(tp); } /* * Avoid the grotesquely inefficient lineswitch routine * (ttyinput) in "raw" mode. It usually takes about 450 * instructions (that's without canonical processing or echo!). * slinput is reasonably fast (usually 40 instructions plus * call overhead). */ if (!(tp->t_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXOFF | IXON)) && !(tp->t_lflag & (ECHO | ECHONL | ICANON | IEXTEN | ISIG | PENDIN)) && !(tp->t_state & (TS_CNTTB | TS_LNCH)) && linesw[tp->t_line].l_rint == ttyinput) { tk_nin += incc; tk_rawcc += incc; tp->t_rawcc += incc; com->delta_error_counts[CE_TTY_BUF_OVERFLOW] += incc - rb_write(&tp->t_raw, (char *) buf, incc); ttwakeup(tp); if (tp->t_state & TS_TTSTOP && (tp->t_iflag & IXANY || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) { tp->t_state &= ~TS_TTSTOP; tp->t_lflag &= ~FLUSHO; ttstart(tp); } } else { do { u_char line_status; int recv_data; line_status = (u_char) buf[CE_INPUT_OFFSET]; recv_data = (u_char) *buf++; if (line_status & (LSR_BI | LSR_FE | LSR_OE | LSR_PE)) { if (line_status & LSR_BI) recv_data |= TTY_BI; if (line_status & LSR_FE) recv_data |= TTY_FE; if (line_status & LSR_OE) recv_data |= TTY_OE; if (line_status & LSR_PE) recv_data |= TTY_PE; } (*linesw[tp->t_line].l_rint)(recv_data, tp); } while (--incc > 0); } if (com_events == 0) break; } if (com_events >= LOTS_OF_EVENTS) goto repeat; splx(s); awake = FALSE; } static int comparam(tp, t) struct tty *tp; struct termios *t; { u_int cfcr; int cflag; struct com_s *com; int divisor; int error; Port_t iobase; int s; int unit; /* check requested parameters */ divisor = ttspeedtab(t->c_ospeed, comspeedtab); if (divisor < 0 || t->c_ispeed != 0 && t->c_ispeed != t->c_ospeed) return (EINVAL); /* parameters are OK, convert them to the com struct and the device */ unit = UNIT(tp->t_dev); com = com_addr(unit); iobase = com->iobase; s = spltty(); if (divisor == 0) { (void) commctl(com, MCR_RTS, DMSET); /* hang up line */ splx(s); return (0); } cflag = t->c_cflag; switch (cflag & CSIZE) { case CS5: cfcr = CFCR_5BITS; break; case CS6: cfcr = CFCR_6BITS; break; case CS7: cfcr = CFCR_7BITS; break; default: cfcr = CFCR_8BITS; break; } if (cflag & PARENB) { cfcr |= CFCR_PENAB; if (!(cflag & PARODD)) cfcr |= CFCR_PEVEN; } if (cflag & CSTOPB) cfcr |= CFCR_STOPB; /* * Some UARTs lock up if the divisor latch registers are selected * while the UART is doing output (they refuse to transmit anything * more until given a hard reset). Fix this by stopping filling * the device buffers and waiting for them to drain. Reading the * line status port outside of siointr() might lose some receiver * error bits, but that is acceptable here. */ disable_intr(); retry: com->state &= ~CS_TTGO; enable_intr(); while ((inb(com->line_status_port) & (LSR_TSRE | LSR_TXRDY)) != (LSR_TSRE | LSR_TXRDY)) { error = ttysleep(tp, (caddr_t)&tp->t_raw, TTIPRI | PCATCH, "sioparam", 1); if (error != 0 && error != EAGAIN) { if (!(tp->t_state & TS_TTSTOP)) { disable_intr(); com->state |= CS_TTGO; enable_intr(); } splx(s); return (error); } } disable_intr(); /* very important while com_data is hidden */ /* * XXX - clearing CS_TTGO is not sufficient to stop further output, * because compoll() calls comstart() which set it again because * TS_TTSTOP is set. Clearing TS_TTSTOP would not be sufficient, * for similar reasons. */ if ((inb(com->line_status_port) & (LSR_TSRE | LSR_TXRDY)) != (LSR_TSRE | LSR_TXRDY)) goto retry; outb(iobase + com_cfcr, cfcr | CFCR_DLAB); outb(iobase + com_dlbl, divisor & 0xFF); outb(iobase + com_dlbh, (u_int) divisor >> 8); outb(iobase + com_cfcr, com->cfcr_image = cfcr); if (!(tp->t_state & TS_TTSTOP)) com->state |= CS_TTGO; if (cflag & CRTS_IFLOW) com->state |= CS_RTS_IFLOW; /* XXX - secondary changes? */ else com->state &= ~CS_RTS_IFLOW; /* * Set up state to handle output flow control. * XXX - worth handling MDMBUF (DCD) flow control at the lowest level? * Now has 16+ msec latency, while CTS flow has 50- usec latency. */ com->state &= ~CS_CTS_OFLOW; com->state |= CS_ODEVREADY; if (cflag & CCTS_OFLOW) { com->state |= CS_CTS_OFLOW; if (!(com->last_modem_status & MSR_CTS)) com->state &= ~CS_ODEVREADY; } siointr(unit); /* recover from fiddling with CS_TTGO */ enable_intr(); splx(s); return (0); } static void comstart(tp) struct tty *tp; { struct com_s *com; int s; int unit; unit = UNIT(tp->t_dev); com = com_addr(unit); s = spltty(); disable_intr(); if (tp->t_state & TS_TTSTOP) com->state &= ~CS_TTGO; else com->state |= CS_TTGO; if (tp->t_state & TS_RTS_IFLOW) { if (com->mcr_image & MCR_RTS && com->state & CS_RTS_IFLOW) outb(com->modem_ctl_port, com->mcr_image &= ~MCR_RTS); } else { if (!(com->mcr_image & MCR_RTS) && com->iptr < com->ihighwater) outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS); } enable_intr(); 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 (com->ocount != 0) { disable_intr(); siointr(unit); enable_intr(); } else if (RB_LEN(&tp->t_out) != 0) { tp->t_state |= TS_BUSY; com->ocount = RB_CONTIGGET(&tp->t_out); disable_intr(); com->obufend = (com->optr = (u_char *) tp->t_out.rb_hd) + com->ocount; com->state |= CS_BUSY; siointr(unit); /* fake interrupt to start output */ enable_intr(); } out: splx(s); } void siostop(tp, rw) struct tty *tp; int rw; { struct com_s *com; com = com_addr(UNIT(tp->t_dev)); if (rw & FWRITE) comflush(com); disable_intr(); if (rw & FREAD) { com_events -= (com->iptr - com->ibuf); com->iptr = com->ibuf; } if (tp->t_state & TS_TTSTOP) com->state &= ~CS_TTGO; else com->state |= CS_TTGO; enable_intr(); } static int commctl(com, bits, how) struct com_s *com; int bits; int how; { #ifdef COM_MULTIPORT if (how != DMBIC && !com->multiport) #else if (how != DMBIC) #endif bits |= MCR_IENABLE; disable_intr(); switch (how) { case DMSET: outb(com->modem_ctl_port, com->mcr_image = bits); break; case DMBIS: outb(com->modem_ctl_port, com->mcr_image |= bits); break; case DMBIC: outb(com->modem_ctl_port, com->mcr_image &= ~bits); break; } enable_intr(); return (bits); } static void comwakeup(chan, ticks) caddr_t chan; int ticks; { struct com_s *com; int unit; timeout(comwakeup, (caddr_t) NULL, 1); if (com_events != 0) /* schedule compoll() to run when the cpl allows */ schedsoftcom(); /* recover from lost output interrupts */ for (unit = 0; unit < NSIO; ++unit) { com = com_addr(unit); if (com != NULL && com->state >= (CS_BUSY | CS_TTGO)) { disable_intr(); siointr(unit); enable_intr(); } } return; } void softsio1() { compoll(); } /* * Following are all routines needed for COM to act as console * XXX - not tested in this version * XXX - check that the corresponding serial interrupts are never enabled */ #include "i386/i386/cons.h" void siocnprobe(cp) struct consdev *cp; { int unit; /* locate the major number */ for (commajor = 0; commajor < nchrdev; commajor++) if (cdevsw[commajor].d_open == sioopen) break; /* XXX: ick */ unit = CONUNIT; com_addr(unit) = &com_structs[unit]; com_addr(unit)->iobase = CONADDR; /* make sure hardware exists? XXX */ /* initialize required fields */ cp->cn_dev = makedev(commajor, unit); cp->cn_tp = &sio_tty[unit]; #ifdef COMCONSOLE cp->cn_pri = CN_REMOTE; /* Force a serial port console */ #else cp->cn_pri = CN_NORMAL; #endif } void siocninit(cp) struct consdev *cp; { int unit; unit = UNIT(cp->cn_dev); cominit(unit, comdefaultrate); comconsole = unit; comconsinit = TRUE; } static void cominit(unit, rate) int unit; int rate; { Port_t iobase; int s; iobase = com_addr(unit)->iobase; s = splhigh(); outb(iobase + com_cfcr, CFCR_DLAB); rate = ttspeedtab(comdefaultrate, comspeedtab); outb(iobase + com_data, rate & 0xFF); outb(iobase + com_ier, rate >> 8); outb(iobase + com_cfcr, CFCR_8BITS); /* * XXX - fishy to enable interrupts and then poll. * It shouldn't be necessary to ready the iir. */ outb(iobase + com_ier, IER_ERXRDY | IER_ETXRDY | IER_ERLS | IER_EMSC); outb(iobase + com_fifo, FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_14); (void) inb(iobase + com_iir); splx(s); } int siocngetc(dev) dev_t dev; { int c; Port_t iobase; int s; iobase = com_addr(UNIT(dev))->iobase; s = splhigh(); while (!(inb(iobase + com_lsr) & LSR_RXRDY)) ; c = inb(iobase + com_data); (void) inb(iobase + com_iir); splx(s); return (c); } void siocnputc(dev, c) dev_t dev; int c; { Port_t iobase; int s; int timo; iobase = com_addr(UNIT(dev))->iobase; s = splhigh(); #ifdef KGDB if (dev != kgdb_dev) #endif if (!comconsinit) { (void) cominit(UNIT(dev), comdefaultrate); comconsinit = TRUE; } /* wait for any pending transmission to finish */ timo = 50000; while (!(inb(iobase + com_lsr) & LSR_TXRDY) && --timo) ; outb(iobase + com_data, c); /* wait for this transmission to complete */ timo = 1500000; while (!(inb(iobase + com_lsr) & LSR_TXRDY) && --timo) ; /* clear any interrupts generated by this transmission */ (void) inb(iobase + com_iir); splx(s); } /* * 10 Feb 93 Jordan K. Hubbard Added select code * 27 May 93 Rodney W. Grimes Stole the select code from com.c.pl5 * * XXX - the standard com.c never needed this, but we need it because * ttselect() can't determine the tty struct because stuff is encoded in the * high bit of the minor number. */ int sioselect(dev, rw, p) dev_t dev; int rw; struct proc *p; { struct tty *tp = &sio_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); } #endif /* NSIO > 0 */