dc08ffec87
Introduce d_version field in struct cdevsw, this must always be initialized to D_VERSION. Flip sense of D_NOGIANT flag to D_NEEDGIANT, this involves removing four D_NOGIANT flags and adding 145 D_NEEDGIANT flags.
649 lines
14 KiB
C
649 lines
14 KiB
C
/*
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* Copyright (C) 2003
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* Hidetoshi Shimokawa. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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*
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* This product includes software developed by Hidetoshi Shimokawa.
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*
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* 4. Neither the name of the author nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: dcons.c,v 1.65 2003/10/24 03:24:55 simokawa Exp $
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/types.h>
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#include <sys/conf.h>
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#include <sys/cons.h>
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#include <sys/consio.h>
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#include <sys/tty.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/ucred.h>
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#include <machine/bus.h>
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#include <dev/dcons/dcons.h>
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#include <ddb/ddb.h>
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#include <sys/reboot.h>
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#include <sys/sysctl.h>
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#include "opt_ddb.h"
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#include "opt_comconsole.h"
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#include "opt_dcons.h"
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#ifndef DCONS_POLL_HZ
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#define DCONS_POLL_HZ 100
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#endif
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#ifndef DCONS_BUF_SIZE
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#define DCONS_BUF_SIZE (16*1024)
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#endif
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#ifndef DCONS_FORCE_CONSOLE
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#define DCONS_FORCE_CONSOLE 0 /* mostly for FreeBSD-4 */
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#endif
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#ifndef DCONS_FORCE_GDB
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#define DCONS_FORCE_GDB 1
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#endif
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#if __FreeBSD_version >= 500101
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#define CONS_NODEV 1 /* for latest current */
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static struct consdev gdbconsdev;
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#endif
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static d_open_t dcons_open;
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static d_close_t dcons_close;
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static d_ioctl_t dcons_ioctl;
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static struct cdevsw dcons_cdevsw = {
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#if __FreeBSD_version >= 500104
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.d_version = D_VERSION,
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.d_open = dcons_open,
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.d_close = dcons_close,
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.d_ioctl = dcons_ioctl,
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.d_name = "dcons",
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.d_flags = D_TTY | D_NEEDGIANT,
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#else
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/* open */ dcons_open,
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/* close */ dcons_close,
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/* read */ ttyread,
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/* write */ ttywrite,
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/* ioctl */ dcons_ioctl,
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/* poll */ ttypoll,
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/* mmap */ nommap,
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/* strategy */ nostrategy,
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/* name */ "dcons",
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/* major */ CDEV_MAJOR,
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/* dump */ nodump,
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/* psize */ nopsize,
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/* flags */ 0,
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#endif
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};
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#ifndef KLD_MODULE
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static char bssbuf[DCONS_BUF_SIZE]; /* buf in bss */
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#endif
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/* global data */
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static struct dcons_global dg;
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struct dcons_global *dcons_conf;
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static int poll_hz = DCONS_POLL_HZ;
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SYSCTL_NODE(_kern, OID_AUTO, dcons, CTLFLAG_RD, 0, "Dumb Console");
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SYSCTL_INT(_kern_dcons, OID_AUTO, poll_hz, CTLFLAG_RW, &poll_hz, 0,
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"dcons polling rate");
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static int drv_init = 0;
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static struct callout dcons_callout;
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struct dcons_buf *dcons_buf; /* for local dconschat */
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/* per device data */
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static struct dcons_softc {
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dev_t dev;
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struct dcons_ch o, i;
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int brk_state;
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#define DC_GDB 1
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int flags;
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} sc[DCONS_NPORT];
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static void dcons_tty_start(struct tty *);
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static int dcons_tty_param(struct tty *, struct termios *);
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static void dcons_timeout(void *);
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static int dcons_drv_init(int);
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static int dcons_getc(struct dcons_softc *);
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static int dcons_checkc(struct dcons_softc *);
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static void dcons_putc(struct dcons_softc *, int);
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static cn_probe_t dcons_cnprobe;
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static cn_init_t dcons_cninit;
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static cn_getc_t dcons_cngetc;
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static cn_checkc_t dcons_cncheckc;
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static cn_putc_t dcons_cnputc;
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CONS_DRIVER(dcons, dcons_cnprobe, dcons_cninit, NULL, dcons_cngetc,
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dcons_cncheckc, dcons_cnputc, NULL);
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#if __FreeBSD_version < 500000
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#define THREAD proc
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#else
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#define THREAD thread
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#endif
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static int
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dcons_open(dev_t dev, int flag, int mode, struct THREAD *td)
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{
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struct tty *tp;
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int unit, error, s;
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unit = minor(dev);
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if (unit != 0)
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return (ENXIO);
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tp = dev->si_tty = ttymalloc(dev->si_tty);
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tp->t_oproc = dcons_tty_start;
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tp->t_param = dcons_tty_param;
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tp->t_stop = nottystop;
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tp->t_dev = dev;
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error = 0;
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s = spltty();
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if ((tp->t_state & TS_ISOPEN) == 0) {
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tp->t_state |= TS_CARR_ON;
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ttychars(tp);
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tp->t_iflag = TTYDEF_IFLAG;
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tp->t_oflag = TTYDEF_OFLAG;
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tp->t_cflag = TTYDEF_CFLAG|CLOCAL;
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tp->t_lflag = TTYDEF_LFLAG;
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tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
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ttsetwater(tp);
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} else if ((tp->t_state & TS_XCLUDE) && suser(td)) {
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splx(s);
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return (EBUSY);
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}
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splx(s);
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error = (*linesw[tp->t_line].l_open)(dev, tp);
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return (error);
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}
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static int
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dcons_close(dev_t dev, int flag, int mode, struct THREAD *td)
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{
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int unit;
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struct tty *tp;
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unit = minor(dev);
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if (unit != 0)
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return (ENXIO);
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tp = dev->si_tty;
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if (tp->t_state & TS_ISOPEN) {
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(*linesw[tp->t_line].l_close)(tp, flag);
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ttyclose(tp);
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}
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return (0);
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}
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static int
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dcons_ioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct THREAD *td)
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{
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int unit;
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struct tty *tp;
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int error;
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unit = minor(dev);
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if (unit != 0)
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return (ENXIO);
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tp = dev->si_tty;
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error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td);
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if (error != ENOIOCTL)
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return (error);
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error = ttioctl(tp, cmd, data, flag);
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if (error != ENOIOCTL)
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return (error);
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return (ENOTTY);
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}
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static int
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dcons_tty_param(struct tty *tp, struct termios *t)
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{
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tp->t_ispeed = t->c_ispeed;
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tp->t_ospeed = t->c_ospeed;
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tp->t_cflag = t->c_cflag;
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return 0;
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}
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static void
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dcons_tty_start(struct tty *tp)
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{
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struct dcons_softc *dc;
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int s;
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dc = (struct dcons_softc *)tp->t_dev->si_drv1;
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s = spltty();
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if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) {
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ttwwakeup(tp);
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return;
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}
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tp->t_state |= TS_BUSY;
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while (tp->t_outq.c_cc != 0)
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dcons_putc(dc, getc(&tp->t_outq));
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tp->t_state &= ~TS_BUSY;
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ttwwakeup(tp);
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splx(s);
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}
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static void
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dcons_timeout(void *v)
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{
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struct tty *tp;
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struct dcons_softc *dc;
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int i, c, polltime;
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for (i = 0; i < DCONS_NPORT; i ++) {
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dc = &sc[i];
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tp = dc->dev->si_tty;
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while ((c = dcons_checkc(dc)) != -1)
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if (tp->t_state & TS_ISOPEN)
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(*linesw[tp->t_line].l_rint)(c, tp);
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}
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polltime = hz / poll_hz;
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if (polltime < 1)
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polltime = 1;
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callout_reset(&dcons_callout, polltime, dcons_timeout, tp);
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}
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static void
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dcons_cnprobe(struct consdev *cp)
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{
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#if __FreeBSD_version >= 501109
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sprintf(cp->cn_name, "dcons");
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#else
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cp->cn_dev = makedev(CDEV_MAJOR, DCONS_CON);
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#endif
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#if DCONS_FORCE_CONSOLE
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cp->cn_pri = CN_REMOTE;
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#else
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cp->cn_pri = CN_NORMAL;
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#endif
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}
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static void
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dcons_cninit(struct consdev *cp)
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{
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dcons_drv_init(0);
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#if CONS_NODEV
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cp->cn_arg
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#else
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cp->cn_dev->si_drv1
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#endif
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= (void *)&sc[DCONS_CON]; /* share port0 with unit0 */
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}
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#if CONS_NODEV
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static int
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dcons_cngetc(struct consdev *cp)
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{
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return(dcons_getc((struct dcons_softc *)cp->cn_arg));
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}
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static int
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dcons_cncheckc(struct consdev *cp)
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{
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return(dcons_checkc((struct dcons_softc *)cp->cn_arg));
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}
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static void
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dcons_cnputc(struct consdev *cp, int c)
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{
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dcons_putc((struct dcons_softc *)cp->cn_arg, c);
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}
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#else
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static int
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dcons_cngetc(dev_t dev)
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{
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return(dcons_getc((struct dcons_softc *)dev->si_drv1));
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}
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static int
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dcons_cncheckc(dev_t dev)
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{
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return(dcons_checkc((struct dcons_softc *)dev->si_drv1));
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}
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static void
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dcons_cnputc(dev_t dev, int c)
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{
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dcons_putc((struct dcons_softc *)dev->si_drv1, c);
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}
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#endif
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static int
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dcons_getc(struct dcons_softc *dc)
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{
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int c;
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while ((c = dcons_checkc(dc)) == -1);
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return (c & 0xff);
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}
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static int
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dcons_checkc(struct dcons_softc *dc)
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{
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unsigned char c;
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u_int32_t ptr, pos, gen, next_gen;
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struct dcons_ch *ch;
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ch = &dc->i;
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if (dg.dma_tag != NULL)
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bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTREAD);
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ptr = ntohl(*ch->ptr);
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gen = ptr >> DCONS_GEN_SHIFT;
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pos = ptr & DCONS_POS_MASK;
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if (gen == ch->gen && pos == ch->pos)
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return (-1);
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next_gen = DCONS_NEXT_GEN(ch->gen);
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/* XXX sanity check */
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if ((gen != ch->gen && gen != next_gen)
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|| (gen == ch->gen && pos < ch->pos)) {
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/* generation skipped !! */
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/* XXX discard */
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ch->gen = gen;
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ch->pos = pos;
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return (-1);
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}
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c = ch->buf[ch->pos];
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ch->pos ++;
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if (ch->pos >= ch->size) {
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ch->gen = next_gen;
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ch->pos = 0;
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}
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#if DDB && ALT_BREAK_TO_DEBUGGER
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switch (dc->brk_state) {
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case STATE1:
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if (c == KEY_TILDE)
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dc->brk_state = STATE2;
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else
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dc->brk_state = STATE0;
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break;
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case STATE2:
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dc->brk_state = STATE0;
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if (c == KEY_CTRLB) {
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#if DCONS_FORCE_GDB
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if (dc->flags & DC_GDB)
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boothowto |= RB_GDB;
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#endif
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breakpoint();
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}
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}
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if (c == KEY_CR)
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dc->brk_state = STATE1;
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#endif
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return (c);
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}
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static void
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dcons_putc(struct dcons_softc *dc, int c)
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{
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struct dcons_ch *ch;
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ch = &dc->o;
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ch->buf[ch->pos] = c;
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ch->pos ++;
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if (ch->pos >= ch->size) {
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ch->gen = DCONS_NEXT_GEN(ch->gen);
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ch->pos = 0;
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}
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*ch->ptr = DCONS_MAKE_PTR(ch);
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if (dg.dma_tag != NULL)
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bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREWRITE);
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}
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static int
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dcons_init_port(int port, int offset, int size)
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{
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int osize;
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struct dcons_softc *dc;
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dc = &sc[port];
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osize = size * 3 / 4;
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dc->o.size = osize;
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dc->i.size = size - osize;
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dc->o.buf = (char *)dg.buf + offset;
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dc->i.buf = dc->o.buf + osize;
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dc->o.gen = dc->i.gen = 0;
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dc->o.pos = dc->i.pos = 0;
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dc->o.ptr = &dg.buf->optr[port];
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dc->i.ptr = &dg.buf->iptr[port];
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dc->brk_state = STATE0;
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dg.buf->osize[port] = htonl(osize);
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dg.buf->isize[port] = htonl(size - osize);
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dg.buf->ooffset[port] = htonl(offset);
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dg.buf->ioffset[port] = htonl(offset + osize);
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dg.buf->optr[port] = DCONS_MAKE_PTR(&dc->o);
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dg.buf->iptr[port] = DCONS_MAKE_PTR(&dc->i);
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return(0);
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}
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static int
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dcons_drv_init(int stage)
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{
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int size, size0, offset;
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if (drv_init)
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return(drv_init);
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drv_init = -1;
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bzero(&dg, sizeof(dg));
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dcons_conf = &dg;
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dg.cdev = &dcons_consdev;
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dg.size = DCONS_BUF_SIZE;
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#ifndef KLD_MODULE
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if (stage == 0) /* XXX or cold */
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/*
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* DCONS_FORCE_CONSOLE == 1 and statically linked.
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* called from cninit(). can't use contigmalloc yet .
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*/
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dg.buf = (struct dcons_buf *) bssbuf;
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else
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#endif
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/*
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* DCONS_FORCE_CONSOLE == 0 or kernel module case.
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* if the module is loaded after boot,
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* bssbuf could be non-continuous.
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*/
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dg.buf = (struct dcons_buf *) contigmalloc(dg.size,
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M_DEVBUF, 0, 0x10000, 0xffffffff, PAGE_SIZE, 0ul);
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dcons_buf = dg.buf;
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offset = DCONS_HEADER_SIZE;
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size = (dg.size - offset);
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size0 = size * 3 / 4;
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dcons_init_port(0, offset, size0);
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offset += size0;
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dcons_init_port(1, offset, size - size0);
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dg.buf->version = htonl(DCONS_VERSION);
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dg.buf->magic = ntohl(DCONS_MAGIC);
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#if DDB && DCONS_FORCE_GDB
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#if CONS_NODEV
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gdbconsdev.cn_arg = (void *)&sc[DCONS_GDB];
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#if __FreeBSD_version >= 501109
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sprintf(gdbconsdev.cn_name, "dgdb");
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#endif
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gdb_arg = &gdbconsdev;
|
|
#else
|
|
gdbdev = makedev(CDEV_MAJOR, DCONS_GDB);
|
|
#endif
|
|
gdb_getc = dcons_cngetc;
|
|
gdb_putc = dcons_cnputc;
|
|
#endif
|
|
drv_init = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int
|
|
dcons_attach_port(int port, char *name, int flags)
|
|
{
|
|
struct dcons_softc *dc;
|
|
struct tty *tp;
|
|
|
|
dc = &sc[port];
|
|
dc->flags = flags;
|
|
dc->dev = make_dev(&dcons_cdevsw, port,
|
|
UID_ROOT, GID_WHEEL, 0600, name);
|
|
tp = ttymalloc(NULL);
|
|
|
|
dc->dev->si_drv1 = (void *)dc;
|
|
dc->dev->si_tty = tp;
|
|
|
|
tp->t_oproc = dcons_tty_start;
|
|
tp->t_param = dcons_tty_param;
|
|
tp->t_stop = nottystop;
|
|
tp->t_dev = dc->dev;
|
|
|
|
return(0);
|
|
}
|
|
|
|
static int
|
|
dcons_attach(void)
|
|
{
|
|
int polltime;
|
|
|
|
dcons_attach_port(DCONS_CON, "dcons", 0);
|
|
dcons_attach_port(DCONS_GDB, "dgdb", DC_GDB);
|
|
#if __FreeBSD_version < 500000
|
|
callout_init(&dcons_callout);
|
|
#else
|
|
callout_init(&dcons_callout, 0);
|
|
#endif
|
|
polltime = hz / poll_hz;
|
|
if (polltime < 1)
|
|
polltime = 1;
|
|
callout_reset(&dcons_callout, polltime, dcons_timeout, NULL);
|
|
return(0);
|
|
}
|
|
|
|
static int
|
|
dcons_detach(int port)
|
|
{
|
|
struct tty *tp;
|
|
struct dcons_softc *dc;
|
|
|
|
dc = &sc[port];
|
|
|
|
tp = dc->dev->si_tty;
|
|
|
|
if (tp->t_state & TS_ISOPEN) {
|
|
printf("dcons: still opened\n");
|
|
(*linesw[tp->t_line].l_close)(tp, 0);
|
|
tp->t_gen++;
|
|
ttyclose(tp);
|
|
ttwakeup(tp);
|
|
ttwwakeup(tp);
|
|
}
|
|
/* XXX
|
|
* must wait until all device are closed.
|
|
*/
|
|
tsleep((void *)dc, PWAIT, "dcodtc", hz/4);
|
|
destroy_dev(dc->dev);
|
|
|
|
return(0);
|
|
}
|
|
|
|
|
|
/* cnXXX works only for FreeBSD-5 */
|
|
static int
|
|
dcons_modevent(module_t mode, int type, void *data)
|
|
{
|
|
int err = 0, ret;
|
|
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
ret = dcons_drv_init(1);
|
|
dcons_attach();
|
|
#if __FreeBSD_version >= 500000
|
|
if (ret == 0) {
|
|
dcons_cnprobe(&dcons_consdev);
|
|
dcons_cninit(&dcons_consdev);
|
|
cnadd(&dcons_consdev);
|
|
}
|
|
#endif
|
|
break;
|
|
case MOD_UNLOAD:
|
|
printf("dcons: unload\n");
|
|
callout_stop(&dcons_callout);
|
|
#if DDB && DCONS_FORCE_GDB
|
|
#if CONS_NODEV
|
|
gdb_arg = NULL;
|
|
#else
|
|
gdbdev = NODEV;
|
|
#endif
|
|
#endif
|
|
#if __FreeBSD_version >= 500000
|
|
cnremove(&dcons_consdev);
|
|
#endif
|
|
dcons_detach(DCONS_CON);
|
|
dcons_detach(DCONS_GDB);
|
|
dg.buf->magic = 0;
|
|
|
|
contigfree(dg.buf, DCONS_BUF_SIZE, M_DEVBUF);
|
|
|
|
break;
|
|
case MOD_SHUTDOWN:
|
|
break;
|
|
}
|
|
return(err);
|
|
}
|
|
|
|
DEV_MODULE(dcons, dcons_modevent, NULL);
|
|
MODULE_VERSION(dcons, DCONS_VERSION);
|