44a93ea590
These modules are the core of the tty code that in the long term needs access to struct tty. (It may be that in the future this can be cut back to just tty.c; we'll see. For now I'll settle for keeping drivers out of struct tty.)
360 lines
9.2 KiB
C
360 lines
9.2 KiB
C
/* $NetBSD: tty_conf.c,v 1.56 2014/05/22 16:28:06 dholland Exp $ */
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/*-
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* Copyright (c) 2005, 2007 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*-
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* Copyright (c) 1982, 1986, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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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. Neither the name of the University 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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* @(#)tty_conf.c 8.5 (Berkeley) 1/9/95
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: tty_conf.c,v 1.56 2014/05/22 16:28:06 dholland Exp $");
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#define TTY_ALLOW_PRIVATE
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/poll.h>
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#include <sys/proc.h>
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#include <sys/tty.h>
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#include <sys/ttycom.h>
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#include <sys/conf.h>
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#include <sys/mutex.h>
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#include <sys/queue.h>
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static struct linesw termios_disc = {
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.l_name = "termios",
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.l_open = ttylopen,
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.l_close = ttylclose,
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.l_read = ttread,
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.l_write = ttwrite,
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.l_ioctl = ttynullioctl,
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.l_rint = ttyinput,
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.l_start = ttstart,
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.l_modem = ttymodem,
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.l_poll = ttpoll
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};
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/*
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* This is for the benefit of old BSD TTY compatbility, but since it is
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* identical to termios (except for the name), don't bother conditionalizing
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* it.
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*/
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static struct linesw ntty_disc = { /* old NTTYDISC */
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.l_name = "ntty",
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.l_open = ttylopen,
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.l_close = ttylclose,
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.l_read = ttread,
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.l_write = ttwrite,
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.l_ioctl = ttynullioctl,
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.l_rint = ttyinput,
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.l_start = ttstart,
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.l_modem = ttymodem,
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.l_poll = ttpoll
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};
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static LIST_HEAD(, linesw) ttyldisc_list = LIST_HEAD_INITIALIZER(ttyldisc_head);
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/*
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* Note: We don't bother refcounting termios_disc and ntty_disc; they can't
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* be removed from the list, and termios_disc is likely to have very many
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* references (could we overflow the count?).
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*/
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#define TTYLDISC_ISSTATIC(disc) \
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((disc) == &termios_disc || (disc) == &ntty_disc)
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#define TTYLDISC_HOLD(disc) \
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do { \
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if (! TTYLDISC_ISSTATIC(disc)) { \
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KASSERT((disc)->l_refcnt != UINT_MAX); \
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(disc)->l_refcnt++; \
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} \
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} while (/*CONSTCOND*/0)
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#define TTYLDISC_RELE(disc) \
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do { \
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if (! TTYLDISC_ISSTATIC(disc)) { \
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KASSERT((disc)->l_refcnt != 0); \
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(disc)->l_refcnt--; \
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} \
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} while (/*CONSTCOND*/0)
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#define TTYLDISC_ISINUSE(disc) \
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(TTYLDISC_ISSTATIC(disc) || (disc)->l_refcnt != 0)
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/*
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* Do nothing specific version of line
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* discipline specific ioctl command.
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*/
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/*ARGSUSED*/
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int
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ttynullioctl(struct tty *tp, u_long cmd, void *data, int flags, struct lwp *l)
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{
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return (EPASSTHROUGH);
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}
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/*
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* Return error to line discipline
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* specific poll call.
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*/
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/*ARGSUSED*/
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int
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ttyerrpoll(struct tty *tp, int events, struct lwp *l)
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{
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return (POLLERR);
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}
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void
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ttyldisc_init(void)
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{
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if (ttyldisc_attach(&termios_disc) != 0)
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panic("ttyldisc_init: termios_disc");
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if (ttyldisc_attach(&ntty_disc) != 0)
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panic("ttyldisc_init: ntty_disc");
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}
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static struct linesw *
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ttyldisc_lookup_locked(const char *name)
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{
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struct linesw *disc;
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LIST_FOREACH(disc, &ttyldisc_list, l_list) {
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if (strcmp(name, disc->l_name) == 0)
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return (disc);
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}
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return (NULL);
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}
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/*
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* Look up a line discipline by its name. Caller holds a reference on
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* the returned line discipline.
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*/
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struct linesw *
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ttyldisc_lookup(const char *name)
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{
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struct linesw *disc;
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mutex_spin_enter(&tty_lock);
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disc = ttyldisc_lookup_locked(name);
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if (disc != NULL)
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TTYLDISC_HOLD(disc);
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mutex_spin_exit(&tty_lock);
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return (disc);
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}
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/*
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* Look up a line discipline by its legacy number. Caller holds a
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* reference on the returned line discipline.
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*/
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struct linesw *
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ttyldisc_lookup_bynum(int num)
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{
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struct linesw *disc;
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mutex_spin_enter(&tty_lock);
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LIST_FOREACH(disc, &ttyldisc_list, l_list) {
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if (disc->l_no == num) {
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TTYLDISC_HOLD(disc);
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mutex_spin_exit(&tty_lock);
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return (disc);
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}
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}
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mutex_spin_exit(&tty_lock);
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return (NULL);
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}
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/*
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* Release a reference on a line discipline previously added by
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* ttyldisc_lookup() or ttyldisc_lookup_bynum().
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*/
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void
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ttyldisc_release(struct linesw *disc)
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{
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if (disc == NULL)
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return;
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mutex_spin_enter(&tty_lock);
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TTYLDISC_RELE(disc);
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mutex_spin_exit(&tty_lock);
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}
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#define TTYLDISC_LEGACY_NUMBER_MIN 10
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#define TTYLDISC_LEGACY_NUMBER_MAX INT_MAX
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static void
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ttyldisc_assign_legacy_number(struct linesw *disc)
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{
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static const struct {
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const char *name;
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int num;
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} table[] = {
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{ "termios", TTYDISC },
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{ "ntty", 2 /* XXX old NTTYDISC */ },
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{ "tablet", TABLDISC },
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{ "slip", SLIPDISC },
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{ "ppp", PPPDISC },
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{ "strip", STRIPDISC },
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{ "hdlc", HDLCDISC },
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{ NULL, 0 }
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};
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struct linesw *ldisc;
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int i;
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for (i = 0; table[i].name != NULL; i++) {
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if (strcmp(disc->l_name, table[i].name) == 0) {
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disc->l_no = table[i].num;
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return;
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}
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}
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disc->l_no = TTYLDISC_LEGACY_NUMBER_MIN;
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LIST_FOREACH(ldisc, &ttyldisc_list, l_list) {
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if (disc->l_no == ldisc->l_no) {
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KASSERT(disc->l_no < TTYLDISC_LEGACY_NUMBER_MAX);
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disc->l_no++;
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}
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}
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}
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/*
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* Register a line discipline.
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*/
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int
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ttyldisc_attach(struct linesw *disc)
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{
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KASSERT(disc->l_name != NULL);
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KASSERT(disc->l_open != NULL);
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KASSERT(disc->l_close != NULL);
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KASSERT(disc->l_read != NULL);
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KASSERT(disc->l_write != NULL);
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KASSERT(disc->l_ioctl != NULL);
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KASSERT(disc->l_rint != NULL);
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KASSERT(disc->l_start != NULL);
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KASSERT(disc->l_modem != NULL);
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KASSERT(disc->l_poll != NULL);
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/* You are not allowed to exceed TTLINEDNAMELEN */
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if (strlen(disc->l_name) >= TTLINEDNAMELEN)
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return (ENAMETOOLONG);
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mutex_spin_enter(&tty_lock);
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if (ttyldisc_lookup_locked(disc->l_name) != NULL) {
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mutex_spin_exit(&tty_lock);
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return (EEXIST);
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}
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ttyldisc_assign_legacy_number(disc);
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LIST_INSERT_HEAD(&ttyldisc_list, disc, l_list);
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mutex_spin_exit(&tty_lock);
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return (0);
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}
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/*
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* Remove a line discipline.
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*/
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int
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ttyldisc_detach(struct linesw *disc)
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{
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#ifdef DIAGNOSTIC
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struct linesw *ldisc = ttyldisc_lookup(disc->l_name);
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KASSERT(ldisc != NULL);
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KASSERT(ldisc == disc);
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ttyldisc_release(ldisc);
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#endif
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mutex_spin_enter(&tty_lock);
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if (TTYLDISC_ISINUSE(disc)) {
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mutex_spin_exit(&tty_lock);
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return (EBUSY);
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}
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LIST_REMOVE(disc, l_list);
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mutex_spin_exit(&tty_lock);
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return (0);
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}
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/*
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* Return the default line discipline.
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*/
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struct linesw *
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ttyldisc_default(void)
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{
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return (&termios_disc);
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}
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