scoutos / prex-0.9.0 / bsp / drv / dev / base / tty.c @ 03e9c04a
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/*-
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* Copyright (c) 1982, 1986, 1990, 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.c 8.13 (Berkeley) 1/9/95
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*/
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/* Modified for Prex by Kohsuke Ohtani. */
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/*
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* tty.c - TTY device helper
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*/
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#include <driver.h> |
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#include <sys/signal.h> |
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#include <sys/termios.h> |
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#include <tty.h> |
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#include <pm.h> |
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#include <kd.h> |
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/* #define DEBUG_TTY 1 */
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#ifdef DEBUG_TTY
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#define DPRINTF(a) printf a
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#else
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#define DPRINTF(a)
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#endif
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#define FREAD 0x0001 |
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#define FWRITE 0x0002 |
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static void tty_output(int c, struct tty *tp); |
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/* default control characters */
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static const cc_t ttydefchars[NCCS] = TTYDEFCHARS; |
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#define is_ctrl(c) ((c) < 32 || (c) == 0x7f) |
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/*
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* TTY queue operations
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*/
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#define ttyq_next(i) (((i) + 1) & (TTYQ_SIZE - 1)) |
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#define ttyq_prev(i) (((i) - 1) & (TTYQ_SIZE - 1)) |
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#define ttyq_full(q) ((q)->tq_count >= TTYQ_SIZE)
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#define ttyq_empty(q) ((q)->tq_count == 0) |
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/*
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* Get a character from a queue.
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*/
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int
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tty_getc(struct tty_queue *tq)
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{ |
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char c;
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int s;
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s = splhigh(); |
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if (ttyq_empty(tq)) {
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splx(s); |
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return -1; |
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} |
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c = tq->tq_buf[tq->tq_head]; |
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tq->tq_head = ttyq_next(tq->tq_head); |
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tq->tq_count--; |
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splx(s); |
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return (int)c; |
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} |
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/*
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* Put a character into a queue.
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*/
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static void |
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tty_putc(int c, struct tty_queue *tq) |
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{ |
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int s;
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s = splhigh(); |
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if (ttyq_full(tq)) {
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splx(s); |
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return;
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} |
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tq->tq_buf[tq->tq_tail] = (char)(c & 0xff); |
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tq->tq_tail = ttyq_next(tq->tq_tail); |
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tq->tq_count++; |
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splx(s); |
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} |
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/*
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* Remove the last character in a queue and return it.
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*/
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static int |
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tty_unputc(struct tty_queue *tq)
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{ |
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char c;
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int s;
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if (ttyq_empty(tq))
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return -1; |
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s = splhigh(); |
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tq->tq_tail = ttyq_prev(tq->tq_tail); |
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c = tq->tq_buf[tq->tq_tail]; |
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tq->tq_count--; |
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splx(s); |
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return (int)c; |
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} |
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/*
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* Put the chars in the from queue on the end of the to queue.
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*/
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static void |
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tty_catq(struct tty_queue *from, struct tty_queue *to) |
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{ |
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int c;
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while ((c = tty_getc(from)) != -1) |
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tty_putc(c, to); |
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} |
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/*
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* Rubout one character from the rawq of tp
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*/
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static void |
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tty_rubout(int c, struct tty *tp) |
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{ |
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if (!(tp->t_lflag & ECHO))
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return;
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if (tp->t_lflag & ECHOE) {
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tty_output('\b', tp);
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tty_output(' ', tp);
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tty_output('\b', tp);
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} else
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tty_output(tp->t_cc[VERASE], tp); |
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} |
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/*
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* Echo char
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*/
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static void |
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tty_echo(int c, struct tty *tp) |
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{ |
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if (!(tp->t_lflag & ECHO)) {
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if (c == '\n' && (tp->t_lflag & ECHONL)) |
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tty_output('\n', tp);
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return;
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} |
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if (is_ctrl(c) && c != '\n' && c != '\t' && c != '\b') { |
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tty_output('^', tp);
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tty_output(c + 'A' - 1, tp); |
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} else
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tty_output(c, tp); |
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} |
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/*
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* Start output.
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*/
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static void |
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tty_start(struct tty *tp)
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{ |
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DPRINTF(("tty_start\n"));
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if (tp->t_state & (TS_TTSTOP|TS_BUSY))
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return;
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if (tp->t_oproc)
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(*tp->t_oproc)(tp); |
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} |
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/*
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* Flush tty read and/or write queues, notifying anyone waiting.
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*/
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static void |
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tty_flush(struct tty *tp, int rw) |
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{ |
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DPRINTF(("tty_flush rw=%d\n", rw));
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if (rw & FREAD) {
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while (tty_getc(&tp->t_canq) != -1) |
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; |
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while (tty_getc(&tp->t_rawq) != -1) |
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; |
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sched_wakeup(&tp->t_input); |
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} |
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if (rw & FWRITE) {
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tp->t_state &= ~TS_TTSTOP; |
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tty_start(tp); |
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} |
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} |
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/*
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* Output is completed.
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*/
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void
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tty_done(struct tty *tp)
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{ |
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if (tp->t_outq.tq_count == 0) |
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tp->t_state &= ~TS_BUSY; |
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if (tp->t_state & TS_ASLEEP) {
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tp->t_state &= ~TS_ASLEEP; |
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sched_wakeup(&tp->t_output); |
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} |
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} |
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/*
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* Wait for output to drain.
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*/
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static void |
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tty_wait(struct tty *tp)
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{ |
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/* DPRINTF(("tty_wait\n")); */
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if ((tp->t_outq.tq_count > 0) && tp->t_oproc) { |
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tp->t_state |= TS_BUSY; |
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while (1) { |
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(*tp->t_oproc)(tp); |
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if ((tp->t_state & TS_BUSY) == 0) |
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break;
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tp->t_state |= TS_ASLEEP; |
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sched_sleep(&tp->t_output); |
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} |
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} |
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} |
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/*
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* Send TTY signal at DPC level.
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*/
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static void |
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tty_signal(void *arg)
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{ |
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struct tty *tp = arg;
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DPRINTF(("tty_signal sig=%d\n", tp->t_signo));
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exception_post(tp->t_sigtask, tp->t_signo); |
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} |
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/*
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* Process input of a single character received on a tty.
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* echo if required.
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* This may be called with interrupt level.
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*/
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void
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tty_input(int c, struct tty *tp) |
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{ |
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unsigned char *cc; |
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tcflag_t iflag, lflag; |
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int sig = -1; |
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DPRINTF(("tty_input: %d\n", c));
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/* Reload power management timer */
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pm_notify(PME_USER_ACTIVITY); |
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lflag = tp->t_lflag; |
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iflag = tp->t_iflag; |
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cc = tp->t_cc; |
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#if defined(DEBUG) && defined(CONFIG_KD)
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if (c == cc[VDDB]) {
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kd_enter(); |
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tty_flush(tp, FREAD | FWRITE); |
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goto endcase;
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} |
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#endif /* !CONFIG_KD*/ |
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/* IGNCR, ICRNL, INLCR */
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if (c == '\r') { |
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if (iflag & IGNCR)
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goto endcase;
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else if (iflag & ICRNL) |
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c = '\n';
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} else if (c == '\n' && (iflag & INLCR)) |
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c = '\r';
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if (iflag & IXON) {
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/* stop (^S) */
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if (c == cc[VSTOP]) {
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if (!(tp->t_state & TS_TTSTOP)) {
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tp->t_state |= TS_TTSTOP; |
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return;
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} |
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if (c != cc[VSTART])
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return;
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/* if VSTART == VSTOP then toggle */
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goto endcase;
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} |
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/* start (^Q) */
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if (c == cc[VSTART])
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goto restartoutput;
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} |
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if (lflag & ICANON) {
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/* erase (^H / ^?) or backspace */
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if (c == cc[VERASE] || c == '\b') { |
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if (!ttyq_empty(&tp->t_rawq))
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tty_rubout(tty_unputc(&tp->t_rawq), tp); |
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goto endcase;
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} |
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/* kill (^U) */
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if (c == cc[VKILL]) {
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while (!ttyq_empty(&tp->t_rawq))
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tty_rubout(tty_unputc(&tp->t_rawq), tp); |
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goto endcase;
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} |
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} |
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if (lflag & ISIG) {
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/* quit (^C) */
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if (c == cc[VINTR] || c == cc[VQUIT]) {
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if (!(lflag & NOFLSH)) {
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tp->t_state |= TS_ISIG; |
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tty_flush(tp, FREAD | FWRITE); |
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} |
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tty_echo(c, tp); |
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sig = (c == cc[VINTR]) ? SIGINT : SIGQUIT; |
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goto endcase;
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} |
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/* suspend (^Z) */
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if (c == cc[VSUSP]) {
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if (!(lflag & NOFLSH)) {
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tp->t_state |= TS_ISIG; |
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tty_flush(tp, FREAD | FWRITE); |
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} |
353 |
tty_echo(c, tp); |
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sig = SIGTSTP; |
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goto endcase;
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} |
357 |
} |
358 |
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/*
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* Check for input buffer overflow
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*/
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if (ttyq_full(&tp->t_rawq)) {
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tty_flush(tp, FREAD | FWRITE); |
364 |
goto endcase;
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} |
366 |
tty_putc(c, &tp->t_rawq); |
367 |
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368 |
if (lflag & ICANON) {
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369 |
if (c == '\n' || c == cc[VEOF] || c == cc[VEOL]) { |
370 |
tty_catq(&tp->t_rawq, &tp->t_canq); |
371 |
sched_wakeup(&tp->t_input); |
372 |
} |
373 |
} else
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374 |
sched_wakeup(&tp->t_input); |
375 |
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376 |
if (lflag & ECHO)
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tty_echo(c, tp); |
378 |
endcase:
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379 |
/*
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380 |
* IXANY means allow any character to restart output.
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381 |
*/
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382 |
if ((tp->t_state & TS_TTSTOP) && (iflag & IXANY) == 0 && |
383 |
cc[VSTART] != cc[VSTOP]) |
384 |
return;
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385 |
restartoutput:
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386 |
tp->t_state &= ~TS_TTSTOP; |
387 |
|
388 |
if (sig != -1) { |
389 |
if (tp->t_sigtask) {
|
390 |
tp->t_signo = sig; |
391 |
sched_dpc(&tp->t_dpc, &tty_signal, tp); |
392 |
} |
393 |
} |
394 |
tty_start(tp); |
395 |
} |
396 |
|
397 |
/*
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398 |
* Output a single character on a tty, doing output processing
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399 |
* as needed (expanding tabs, newline processing, etc.).
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400 |
*/
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401 |
static void |
402 |
tty_output(int c, struct tty *tp) |
403 |
{ |
404 |
int i, col;
|
405 |
|
406 |
if ((tp->t_lflag & ICANON) == 0) { |
407 |
tty_putc(c, &tp->t_outq); |
408 |
return;
|
409 |
} |
410 |
/* Expand tab */
|
411 |
if (c == '\t' && (tp->t_oflag & OXTABS)) { |
412 |
i = 8 - (tp->t_column & 7); |
413 |
tp->t_column += i; |
414 |
do
|
415 |
tty_putc(' ', &tp->t_outq);
|
416 |
while (--i > 0); |
417 |
return;
|
418 |
} |
419 |
/* Translate newline into "\r\n" */
|
420 |
if (c == '\n' && (tp->t_oflag & ONLCR)) |
421 |
tty_putc('\r', &tp->t_outq);
|
422 |
|
423 |
tty_putc(c, &tp->t_outq); |
424 |
|
425 |
col = tp->t_column; |
426 |
switch (c) {
|
427 |
case '\b': /* back space */ |
428 |
if (col > 0) |
429 |
--col; |
430 |
break;
|
431 |
case '\t': /* tab */ |
432 |
col = (col + 8) & ~7; |
433 |
break;
|
434 |
case '\n': /* newline */ |
435 |
col = 0;
|
436 |
break;
|
437 |
case '\r': /* return */ |
438 |
col = 0;
|
439 |
break;
|
440 |
default:
|
441 |
if (!is_ctrl(c))
|
442 |
++col; |
443 |
break;
|
444 |
} |
445 |
tp->t_column = col; |
446 |
return;
|
447 |
} |
448 |
|
449 |
/*
|
450 |
* Process a read call on a tty device.
|
451 |
*/
|
452 |
int
|
453 |
tty_read(struct tty *tp, char *buf, size_t *nbyte) |
454 |
{ |
455 |
unsigned char *cc; |
456 |
struct tty_queue *qp;
|
457 |
int rc, tmp;
|
458 |
u_char c; |
459 |
size_t count = 0;
|
460 |
tcflag_t lflag; |
461 |
|
462 |
DPRINTF(("tty_read\n"));
|
463 |
|
464 |
lflag = tp->t_lflag; |
465 |
cc = tp->t_cc; |
466 |
qp = (lflag & ICANON) ? &tp->t_canq : &tp->t_rawq; |
467 |
|
468 |
/* If there is no input, wait it */
|
469 |
while (ttyq_empty(qp)) {
|
470 |
rc = sched_sleep(&tp->t_input); |
471 |
if (rc == SLP_INTR || tp->t_state & TS_ISIG) {
|
472 |
tp->t_state &= ~TS_ISIG; |
473 |
return EINTR;
|
474 |
} |
475 |
} |
476 |
while (count < *nbyte) {
|
477 |
if ((tmp = tty_getc(qp)) == -1) |
478 |
break;
|
479 |
c = (u_char)tmp; |
480 |
if (c == cc[VEOF] && (lflag & ICANON))
|
481 |
break;
|
482 |
count++; |
483 |
if (copyout(&c, buf, 1)) |
484 |
return EFAULT;
|
485 |
if ((lflag & ICANON) && (c == '\n' || c == cc[VEOL])) |
486 |
break;
|
487 |
buf++; |
488 |
} |
489 |
*nbyte = count; |
490 |
return 0; |
491 |
} |
492 |
|
493 |
/*
|
494 |
* Process a write call on a tty device.
|
495 |
*/
|
496 |
int
|
497 |
tty_write(struct tty *tp, char *buf, size_t *nbyte) |
498 |
{ |
499 |
size_t remain, count = 0;
|
500 |
u_char c; |
501 |
|
502 |
DPRINTF(("tty_write\n"));
|
503 |
|
504 |
remain = *nbyte; |
505 |
while (remain > 0) { |
506 |
if (tp->t_outq.tq_count > TTYQ_HIWAT) {
|
507 |
tty_start(tp); |
508 |
if (tp->t_outq.tq_count <= TTYQ_HIWAT)
|
509 |
continue;
|
510 |
tp->t_state |= TS_ASLEEP; |
511 |
sched_sleep(&tp->t_output); |
512 |
continue;
|
513 |
} |
514 |
if (copyin(buf, &c, 1)) |
515 |
return EFAULT;
|
516 |
tty_output((int)c, tp);
|
517 |
buf++; |
518 |
remain--; |
519 |
count++; |
520 |
} |
521 |
tty_start(tp); |
522 |
*nbyte = count; |
523 |
return 0; |
524 |
} |
525 |
|
526 |
/*
|
527 |
* Ioctls for all tty devices.
|
528 |
*/
|
529 |
int
|
530 |
tty_ioctl(struct tty *tp, u_long cmd, void *data) |
531 |
{ |
532 |
int flags;
|
533 |
struct tty_queue *qp;
|
534 |
|
535 |
switch (cmd) {
|
536 |
case TIOCGETA:
|
537 |
if (copyout(&tp->t_termios, data,
|
538 |
sizeof(struct termios))) |
539 |
return EFAULT;
|
540 |
break;
|
541 |
case TIOCSETAW:
|
542 |
case TIOCSETAF:
|
543 |
tty_wait(tp); |
544 |
if (cmd == TIOCSETAF)
|
545 |
tty_flush(tp, FREAD); |
546 |
/* FALLTHROUGH */
|
547 |
case TIOCSETA:
|
548 |
if (copyin(data, &tp->t_termios,
|
549 |
sizeof(struct termios))) |
550 |
return EFAULT;
|
551 |
break;
|
552 |
case TIOCSPGRP: /* set pgrp of tty */ |
553 |
if (copyin(data, &tp->t_pgid, sizeof(pid_t))) |
554 |
return EFAULT;
|
555 |
break;
|
556 |
case TIOCGPGRP:
|
557 |
if (copyout(&tp->t_pgid, data, sizeof(pid_t))) |
558 |
return EFAULT;
|
559 |
break;
|
560 |
case TIOCFLUSH:
|
561 |
if (copyin(data, &flags, sizeof(flags))) |
562 |
return EFAULT;
|
563 |
if (flags == 0) |
564 |
flags = FREAD | FWRITE; |
565 |
else
|
566 |
flags &= FREAD | FWRITE; |
567 |
tty_flush(tp, flags); |
568 |
break;
|
569 |
case TIOCSTART:
|
570 |
if (tp->t_state & TS_TTSTOP) {
|
571 |
tp->t_state &= ~TS_TTSTOP; |
572 |
tty_start(tp); |
573 |
} |
574 |
break;
|
575 |
case TIOCSTOP:
|
576 |
if (!(tp->t_state & TS_TTSTOP)) {
|
577 |
tp->t_state |= TS_TTSTOP; |
578 |
} |
579 |
break;
|
580 |
case TIOCGWINSZ:
|
581 |
if (copyout(&tp->t_winsize, data,
|
582 |
sizeof(struct winsize))) |
583 |
return EFAULT;
|
584 |
break;
|
585 |
case TIOCSWINSZ:
|
586 |
if (copyin(data, &tp->t_winsize,
|
587 |
sizeof(struct winsize))) |
588 |
return EFAULT;
|
589 |
break;
|
590 |
case TIOCSETSIGT: /* Prex */ |
591 |
if (copyin(data, &tp->t_sigtask, sizeof(task_t))) |
592 |
return EFAULT;
|
593 |
break;
|
594 |
case TIOCINQ:
|
595 |
qp = (tp->t_lflag & ICANON) ? &tp->t_canq : &tp->t_rawq; |
596 |
if (copyout(&qp->tq_count, data, sizeof(int))) |
597 |
return EFAULT;
|
598 |
break;
|
599 |
case TIOCOUTQ:
|
600 |
if (copyout(&tp->t_outq.tq_count, data, sizeof(int))) |
601 |
return EFAULT;
|
602 |
break;
|
603 |
} |
604 |
return 0; |
605 |
} |
606 |
|
607 |
/*
|
608 |
* Attach a tty to the tty list.
|
609 |
*/
|
610 |
void
|
611 |
tty_attach(struct tty *tp)
|
612 |
{ |
613 |
struct bootinfo *bi;
|
614 |
|
615 |
/* Initialize tty */
|
616 |
memset(tp, 0, sizeof(struct tty)); |
617 |
memcpy(&tp->t_termios.c_cc, ttydefchars, sizeof(ttydefchars));
|
618 |
|
619 |
event_init(&tp->t_input, "TTY input");
|
620 |
event_init(&tp->t_output, "TTY output");
|
621 |
|
622 |
tp->t_iflag = TTYDEF_IFLAG; |
623 |
tp->t_oflag = TTYDEF_OFLAG; |
624 |
tp->t_cflag = TTYDEF_CFLAG; |
625 |
tp->t_lflag = TTYDEF_LFLAG; |
626 |
tp->t_ispeed = TTYDEF_SPEED; |
627 |
tp->t_ospeed = TTYDEF_SPEED; |
628 |
|
629 |
machine_bootinfo(&bi); |
630 |
tp->t_winsize.ws_row = (u_short)bi->video.text_y; |
631 |
tp->t_winsize.ws_col = (u_short)bi->video.text_x; |
632 |
} |