416 lines
14 KiB
C
416 lines
14 KiB
C
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/*
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* Copyright (c) 2006-2023, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2023-11-13 Shell init ver.
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*/
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#ifndef __LWP_TERMINAL_H__
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#define __LWP_TERMINAL_H__
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#include "bsd_ttyqueue.h"
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#include "bsd_ttydisc.h"
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#ifdef USING_BSD_HOOK
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#include "bsd_ttyhook.h"
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#endif
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#include <lwp.h>
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#include <rtdef.h>
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/* include kernel header for termios base definitions */
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#include <termios.h>
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/* for _POSIX_VDISABLE */
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#include <unistd.h>
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/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org>
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* All rights reserved.
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*
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* Portions of this software were developed under sponsorship from Snow
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* B.V., the Netherlands.
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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 AUTHOR 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 AUTHOR 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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struct lwp_tty;
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/*
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* Driver routines that are called from the line discipline to adjust
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* hardware parameters and such.
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*/
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typedef int tsw_open_t(struct lwp_tty *tp);
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typedef void tsw_close_t(struct lwp_tty *tp);
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typedef void tsw_outwakeup_t(struct lwp_tty *tp);
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typedef void tsw_inwakeup_t(struct lwp_tty *tp);
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typedef int tsw_ioctl_t(struct lwp_tty *tp, rt_ubase_t cmd, rt_caddr_t data,
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struct rt_thread *td);
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typedef int tsw_cioctl_t(struct lwp_tty *tp, int unit, rt_ubase_t cmd, rt_caddr_t data,
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struct rt_thread *td);
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typedef int tsw_param_t(struct lwp_tty *tp, struct termios *t);
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typedef int tsw_modem_t(struct lwp_tty *tp, int sigon, int sigoff);
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typedef int tsw_mmap_t(struct lwp_tty *tp, vm_ooffset_t offset,
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vm_paddr_t *paddr, int nprot, vm_memattr_t *memattr);
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typedef void tsw_pktnotify_t(struct lwp_tty *tp, char event);
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typedef void tsw_free_t(void *softc);
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typedef rt_bool_t tsw_busy_t(struct lwp_tty *tp);
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struct lwp_ttydevsw
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{
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unsigned int tsw_flags; /* Default TTY flags. */
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tsw_open_t *tsw_open; /* Device opening. */
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tsw_close_t *tsw_close; /* Device closure. */
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tsw_outwakeup_t *tsw_outwakeup; /* Output available. */
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tsw_inwakeup_t *tsw_inwakeup; /* Input can be stored again. */
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tsw_ioctl_t *tsw_ioctl; /* ioctl() hooks. */
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tsw_cioctl_t *tsw_cioctl; /* ioctl() on control devices. */
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tsw_param_t *tsw_param; /* TIOCSETA device parameter setting. */
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tsw_modem_t *tsw_modem; /* Modem sigon/sigoff. */
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tsw_mmap_t *tsw_mmap; /* mmap() hooks. */
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tsw_pktnotify_t *tsw_pktnotify; /* TIOCPKT events. */
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tsw_free_t *tsw_free; /* Destructor. */
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tsw_busy_t *tsw_busy; /* Draining output. */
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void *tsw_spare[3]; /* For future use. */
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};
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typedef struct lwp_ttydevsw *lwp_ttydevsw_t;
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struct lwp_tty
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{
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struct rt_device parent; /* inherit from Class:RT_Device */
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struct rt_mutex *t_mtx; /* TTY lock. */
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struct rt_mutex t_mtxobj; /* Per-TTY lock (when not borrowing). */
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rt_list_t t_list; /* (l) TTY list entry. */
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int t_drainwait; /* (t) TIOCDRAIN timeout seconds. */
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unsigned int t_flags; /* (t) Terminal option flags. */
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/* Keep flags in sync with db_show_tty and pstat(8). */
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#define TF_NOPREFIX 0x00001 /* Don't prepend "tty" to device name. */
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#define TF_INITLOCK 0x00002 /* Create init/lock state devices. */
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#define TF_CALLOUT 0x00004 /* Create "cua" devices. */
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#define TF_OPENED_IN 0x00008 /* "tty" node is in use. */
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#define TF_OPENED_OUT 0x00010 /* "cua" node is in use. */
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#define TF_OPENED_CONS 0x00020 /* Device in use as console. */
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#define TF_OPENED (TF_OPENED_IN | TF_OPENED_OUT | TF_OPENED_CONS)
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#define TF_GONE 0x00040 /* Device node is gone. */
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#define TF_OPENCLOSE 0x00080 /* Device is in open()/close(). */
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#define TF_ASYNC 0x00100 /* Asynchronous I/O enabled. */
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#define TF_LITERAL 0x00200 /* Accept the next character literally. */
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#define TF_HIWAT_IN 0x00400 /* We've reached the input watermark. */
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#define TF_HIWAT_OUT 0x00800 /* We've reached the output watermark. */
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#define TF_HIWAT (TF_HIWAT_IN | TF_HIWAT_OUT)
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#define TF_STOPPED 0x01000 /* Output flow control - stopped. */
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#define TF_EXCLUDE 0x02000 /* Exclusive access. */
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#define TF_BYPASS 0x04000 /* Optimized input path. */
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#define TF_ZOMBIE 0x08000 /* Modem disconnect received. */
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#define TF_HOOK 0x10000 /* TTY has hook attached. */
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#define TF_BUSY_IN 0x20000 /* Process busy in read() -- not supported. */
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#define TF_BUSY_OUT 0x40000 /* Process busy in write(). */
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#define TF_BUSY (TF_BUSY_IN | TF_BUSY_OUT)
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unsigned int t_revokecnt; /* (t) revoke() count. */
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/* Buffering mechanisms. */
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struct ttyinq t_inq; /* (t) Input queue. */
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size_t t_inlow; /* (t) Input low watermark. */
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struct ttyoutq t_outq; /* (t) Output queue. */
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size_t t_outlow; /* (t) Output low watermark. */
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/* Sleeping mechanisms. */
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struct rt_condvar t_inwait; /* (t) Input wait queue. */
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struct rt_condvar t_outwait; /* (t) Output wait queue. */
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struct rt_condvar t_outserwait; /* (t) Serial output wait queue. */
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struct rt_condvar t_bgwait; /* (t) Background wait queue. */
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struct rt_condvar t_dcdwait; /* (t) Carrier Detect wait queue. */
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struct rt_wqueue t_inpoll; /* (t) Input poll queue. */
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struct rt_wqueue t_outpoll; /* (t) Output poll queue. */
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#ifdef USING_BSD_AIO
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struct sigio *t_sigio; /* (t) Asynchronous I/O. */
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#endif
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struct termios t_termios; /* (t) I/O processing flags. */
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struct winsize t_winsize; /* (t) Window size. */
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unsigned int t_column; /* (t) Current cursor position. */
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unsigned int t_writepos; /* (t) Where input was interrupted. */
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int t_compatflags; /* (t) COMPAT_43TTY flags. */
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/* Init/lock-state devices. */
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struct termios t_termios_init_in; /* tty%s.init. */
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struct termios t_termios_lock_in; /* tty%s.lock. */
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#ifdef USING_BSD_INIT_LOCK_DEVICE
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struct termios t_termios_init_out; /* cua%s.init. */
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struct termios t_termios_lock_out; /* cua%s.lock. */
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#endif /* USING_BSD_INIT_LOCK_DEVICE */
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struct lwp_ttydevsw *t_devsw; /* (c) Driver hooks. */
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#ifdef USING_BSD_HOOK
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struct lwp_ttyhook *t_hook; /* (t) Capture/inject hook. */
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#endif
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/* Process signal delivery. */
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struct rt_processgroup *t_pgrp; /* (t) Foreground process group. */
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struct rt_session *t_session; /* (t) Associated session. */
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unsigned int t_sessioncnt; /* (t) Backpointing sessions. */
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void *t_devswsoftc; /* (c) Soft config, for drivers. */
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#ifdef USING_BSD_HOOK
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void *t_hooksoftc; /* (t) Soft config, for hooks. */
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#endif
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#ifdef USING_BSD_CHAR_DEVICE
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struct cdev *t_dev; /* (c) Primary character device. */
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#endif /* USING_BSD_CHAR_DEVICE */
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#ifdef USING_BSD_SIGINFO
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size_t t_prbufsz; /* (t) SIGINFO buffer size. */
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char t_prbuf[]; /* (t) SIGINFO buffer. */
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#endif /* USING_BSD_SIGINFO */
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};
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typedef struct lwp_tty *lwp_tty_t;
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/* Allocation and deallocation. */
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void tty_rel_pgrp(struct lwp_tty *tp, struct rt_processgroup *pgrp);
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void tty_rel_sess(struct lwp_tty *tp, struct rt_session *sess);
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void tty_rel_gone(struct lwp_tty *tp);
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/* tty locking mechanism */
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#define tty_getlock(tp) ((tp)->t_mtx)
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#define tty_lock(tp) rt_mutex_take(tty_getlock(tp), RT_WAITING_FOREVER);
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#define tty_unlock(tp) rt_mutex_release(tty_getlock(tp))
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#define tty_lock_owned(tp) \
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(rt_mutex_get_owner(tty_getlock(tp)) == rt_thread_self())
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#define tty_lock_notrecused(tp) (rt_mutex_get_hold(tty_getlock(tp)) == 1)
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#define tty_assert_locked(tp) RT_ASSERT(tty_lock_owned(tp))
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#define tty_lock_assert(tp, option) \
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(((option) == (MA_OWNED | MA_NOTRECURSED)) \
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? (tty_lock_owned(tp) && tty_lock_notrecused(tp)) \
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: rt_assert_handler("Operation not allowed", __func__, __LINE__))
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/* System messages. */
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int tty_checkoutq(struct lwp_tty *tp);
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int tty_putchar(struct lwp_tty *tp, char c);
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int tty_putstrn(struct lwp_tty *tp, const char *p, size_t n);
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int tty_ioctl(struct lwp_tty *tp, rt_ubase_t cmd, void *data, int fflag,
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struct rt_thread *td);
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int tty_ioctl_compat(struct lwp_tty *tp, rt_ubase_t cmd, rt_caddr_t data, int fflag,
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struct rt_thread *td);
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void tty_set_winsize(struct lwp_tty *tp, const struct winsize *wsz);
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void tty_init_console(struct lwp_tty *tp, speed_t speed);
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void tty_flush(struct lwp_tty *tp, int flags);
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void tty_hiwat_in_block(struct lwp_tty *tp);
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void tty_hiwat_in_unblock(struct lwp_tty *tp);
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dev_t tty_udev(struct lwp_tty *tp);
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/* tesing on tty */
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#define tty_opened(tp) ((tp)->t_flags & TF_OPENED)
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#define tty_gone(tp) ((tp)->t_flags & TF_GONE)
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#define tty_softc(tp) ((tp)->t_devswsoftc)
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#define tty_devname(tp) ((tp)->parent.parent.name)
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/**
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* @brief TTY registeration on device subsystem
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*
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* @warning It's the duty of the caller to ensure that the name is not
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* identical to any existed registered devices.
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*
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* @param terminal the target tty device
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* @param name name of the device (must be exclusive)
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* @return rt_err_t RT_EOK on success
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*/
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rt_err_t lwp_tty_register(lwp_tty_t terminal, const char *name);
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/**
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* @brief TTY allocation and deallocation. TTY devices can be deallocated when
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* the driver doesn't use it anymore, when the TTY isn't a session's
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* controlling TTY and when the device node isn't opened through devfs.
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*
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* @param handle device handle of tty
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* @param softc device configuration binding on tty
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* @param prefix device name prefix
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* @param cutom_mtx the lock provided to protect tty
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* @return lwp_tty_t NULL on failure
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*/
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lwp_tty_t lwp_tty_create_ext(lwp_ttydevsw_t handle, void *softc,
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rt_mutex_t custom_mtx);
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/**
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* @brief Handful version of lwp_tty_create_ext
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*
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* @param softc device configuration binding on tty
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* @param cutom_mtx the lock provided to protect tty
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* @param prefix device name prefix
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* @return lwp_tty_t NULL on failure
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*/
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lwp_tty_t lwp_tty_create(lwp_ttydevsw_t handle, void *softc);
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void lwp_tty_delete(lwp_tty_t tp);
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void lwp_tty_signal_sessleader(struct lwp_tty *tp, int sig);
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void lwp_tty_signal_pgrp(struct lwp_tty *tp, int sig);
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/**
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* @brief Create a new pseudo-terminal multiplexer
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*
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* @param root_path path of root mount point of ptyfs
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* @return rt_device_t new device object if succeed, otherwise NULL
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*/
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rt_err_t lwp_ptmx_init(rt_device_t ptmx_device, const char *root_path);
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#define LWP_CONSOLE_LOWEST_PRIOR 0
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#define LWP_CONSOLE_HIGHEST_PRIO INT_MAX
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/**
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* @brief Register an alternative backend tty device as console
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*/
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rt_err_t lwp_console_register_backend(struct rt_device *bakdev, int prio);
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rt_inline int ttydevsw_open(struct lwp_tty *tp)
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{
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tty_assert_locked(tp);
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MPASS(!tty_gone(tp));
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return (tp->t_devsw->tsw_open(tp));
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}
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rt_inline void ttydevsw_close(struct lwp_tty *tp)
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{
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tty_assert_locked(tp);
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MPASS(!tty_gone(tp));
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tp->t_devsw->tsw_close(tp);
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}
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rt_inline void ttydevsw_outwakeup(struct lwp_tty *tp)
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{
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tty_assert_locked(tp);
|
||
|
|
MPASS(!tty_gone(tp));
|
||
|
|
|
||
|
|
/* Prevent spurious wakeups. */
|
||
|
|
if (ttydisc_getc_poll(tp) == 0)
|
||
|
|
return;
|
||
|
|
|
||
|
|
tp->t_devsw->tsw_outwakeup(tp);
|
||
|
|
}
|
||
|
|
|
||
|
|
rt_inline void ttydevsw_inwakeup(struct lwp_tty *tp)
|
||
|
|
{
|
||
|
|
tty_assert_locked(tp);
|
||
|
|
MPASS(!tty_gone(tp));
|
||
|
|
|
||
|
|
/* Prevent spurious wakeups. */
|
||
|
|
if (tp->t_flags & TF_HIWAT_IN)
|
||
|
|
return;
|
||
|
|
|
||
|
|
tp->t_devsw->tsw_inwakeup(tp);
|
||
|
|
}
|
||
|
|
|
||
|
|
rt_inline int ttydevsw_ioctl(struct lwp_tty *tp, rt_ubase_t cmd, rt_caddr_t data,
|
||
|
|
struct rt_thread *td)
|
||
|
|
{
|
||
|
|
tty_assert_locked(tp);
|
||
|
|
MPASS(!tty_gone(tp));
|
||
|
|
|
||
|
|
return (tp->t_devsw->tsw_ioctl(tp, cmd, data, td));
|
||
|
|
}
|
||
|
|
|
||
|
|
rt_inline int ttydevsw_cioctl(struct lwp_tty *tp, int unit, rt_ubase_t cmd,
|
||
|
|
rt_caddr_t data, struct rt_thread *td)
|
||
|
|
{
|
||
|
|
tty_assert_locked(tp);
|
||
|
|
MPASS(!tty_gone(tp));
|
||
|
|
|
||
|
|
return (tp->t_devsw->tsw_cioctl(tp, unit, cmd, data, td));
|
||
|
|
}
|
||
|
|
|
||
|
|
rt_inline int ttydevsw_param(struct lwp_tty *tp, struct termios *t)
|
||
|
|
{
|
||
|
|
MPASS(!tty_gone(tp));
|
||
|
|
|
||
|
|
return (tp->t_devsw->tsw_param(tp, t));
|
||
|
|
}
|
||
|
|
|
||
|
|
rt_inline int ttydevsw_modem(struct lwp_tty *tp, int sigon, int sigoff)
|
||
|
|
{
|
||
|
|
MPASS(!tty_gone(tp));
|
||
|
|
|
||
|
|
return (tp->t_devsw->tsw_modem(tp, sigon, sigoff));
|
||
|
|
}
|
||
|
|
|
||
|
|
rt_inline int ttydevsw_mmap(struct lwp_tty *tp, vm_ooffset_t offset,
|
||
|
|
vm_paddr_t *paddr, int nprot, vm_memattr_t *memattr)
|
||
|
|
{
|
||
|
|
MPASS(!tty_gone(tp));
|
||
|
|
|
||
|
|
return (tp->t_devsw->tsw_mmap(tp, offset, paddr, nprot, memattr));
|
||
|
|
}
|
||
|
|
|
||
|
|
rt_inline void ttydevsw_pktnotify(struct lwp_tty *tp, char event)
|
||
|
|
{
|
||
|
|
tty_assert_locked(tp);
|
||
|
|
MPASS(!tty_gone(tp));
|
||
|
|
|
||
|
|
tp->t_devsw->tsw_pktnotify(tp, event);
|
||
|
|
}
|
||
|
|
|
||
|
|
rt_inline void ttydevsw_free(struct lwp_tty *tp)
|
||
|
|
{
|
||
|
|
MPASS(tty_gone(tp));
|
||
|
|
|
||
|
|
tp->t_devsw->tsw_free(tty_softc(tp));
|
||
|
|
}
|
||
|
|
|
||
|
|
rt_inline rt_bool_t ttydevsw_busy(struct lwp_tty *tp)
|
||
|
|
{
|
||
|
|
tty_assert_locked(tp);
|
||
|
|
MPASS(!tty_gone(tp));
|
||
|
|
|
||
|
|
return (tp->t_devsw->tsw_busy(tp));
|
||
|
|
}
|
||
|
|
|
||
|
|
rt_inline size_t ttydisc_read_poll(struct lwp_tty *tp)
|
||
|
|
{
|
||
|
|
tty_assert_locked(tp);
|
||
|
|
|
||
|
|
return ttyinq_bytescanonicalized(&tp->t_inq);
|
||
|
|
}
|
||
|
|
|
||
|
|
rt_inline size_t ttydisc_write_poll(struct lwp_tty *tp)
|
||
|
|
{
|
||
|
|
tty_assert_locked(tp);
|
||
|
|
|
||
|
|
return ttyoutq_bytesleft(&tp->t_outq);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* __LWP_TERMINAL_H__ */
|