460 lines
10 KiB
C
460 lines
10 KiB
C
/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Lawrence Berkeley Laboratory.
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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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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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* @(#)cons.c 8.1 (Berkeley) 7/19/93
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*
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* from: Header: cons.c,v 1.12 93/07/20 00:49:45 torek Exp
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* $Id: cons.c,v 1.8 1994/05/13 20:09:00 deraadt Exp $
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*/
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/*
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* Console (indirect) driver.
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*/
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/ioctl.h>
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#include <sys/tty.h>
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#include <sys/file.h>
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#include <sys/conf.h>
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#include <machine/bsd_openprom.h>
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#include <machine/psl.h>
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#include "zs.h"
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struct tty *constty = 0; /* virtual console output device */
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struct tty *fbconstty = 0; /* tty structure for frame buffer console */
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int rom_console_input; /* when set, hardclock calls cnrom() */
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int cons_ocount; /* output byte count */
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extern struct promvec *promvec;
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/*
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* The output driver may munge the minor number in cons.t_dev.
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*/
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struct tty cons; /* rom console tty device */
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struct tty *cn_tty[1] = { &cons };
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static void (*fcnstop) __P((struct tty *, int));
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static void cnstart __P((struct tty *));
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void cnstop __P((struct tty *, int));
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static void cnfbstart __P((struct tty *));
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static void cnfbstop __P((struct tty *, int));
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static void cnfbdma __P((void *));
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extern char char_type[];
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void
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consinit()
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{
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register struct tty *tp = &cons;
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register int in, out;
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void zsconsole(), bwtwoconsole();
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tp->t_dev = makedev(0, 0); /* /dev/console */
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tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
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tp->t_param = (int (*)(struct tty *, struct termios *))nullop;
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in = *promvec->pv_stdin;
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out = *promvec->pv_stdout;
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switch (in) {
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#if NZS > 0
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case PROMDEV_TTYA:
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zsconsole(tp, 0, 0, NULL);
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break;
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case PROMDEV_TTYB:
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zsconsole(tp, 1, 0, NULL);
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break;
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#endif
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case PROMDEV_KBD:
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/*
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* Tell the keyboard driver to direct ASCII input here.
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*/
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kbd_ascii(tp);
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break;
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default:
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rom_console_input = 1;
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printf("unknown console input source %d; using rom\n", in);
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break;
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}
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switch (out) {
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#if NZS > 0
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case PROMDEV_TTYA:
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zsconsole(tp, 0, 1, &fcnstop);
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break;
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case PROMDEV_TTYB:
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zsconsole(tp, 1, 1, &fcnstop);
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break;
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#endif
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case PROMDEV_SCREEN:
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fbconstty = tp;
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tp->t_oproc = cnfbstart;
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fcnstop = cnfbstop;
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break;
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default:
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printf("unknown console output sink %d; using rom\n", out);
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tp->t_oproc = cnstart;
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fcnstop = (void (*)(struct tty *, int))nullop;
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break;
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}
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}
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/* ARGSUSED */
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cnopen(dev, flag, mode, p)
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dev_t dev;
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int flag, mode;
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struct proc *p;
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{
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register struct tty *tp = &cons;
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static int firstopen = 1;
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if(firstopen) {
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clalloc(&tp->t_rawq, 1024, 1);
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clalloc(&tp->t_canq, 1024, 1);
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/* output queue doesn't need quoting */
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clalloc(&tp->t_outq, 1024, 0);
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firstopen = 0;
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}
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if ((tp->t_state & TS_ISOPEN) == 0) {
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/*
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* Leave baud rate alone!
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*/
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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_lflag = TTYDEF_LFLAG;
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tp->t_cflag = TTYDEF_CFLAG;
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tp->t_state = TS_ISOPEN | TS_CARR_ON;
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(void)(*tp->t_param)(tp, &tp->t_termios);
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ttsetwater(tp);
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} else if (tp->t_state & TS_XCLUDE && p->p_ucred->cr_uid != 0)
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return (EBUSY);
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return ((*linesw[tp->t_line].l_open)(dev, tp));
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}
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/* ARGSUSED */
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cnclose(dev, flag, mode, p)
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dev_t dev;
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int flag, mode;
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struct proc *p;
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{
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register struct tty *tp = &cons;
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(*linesw[tp->t_line].l_close)(tp, flag);
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ttyclose(tp);
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return (0);
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}
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/* ARGSUSED */
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cnread(dev, uio, flag)
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dev_t dev;
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struct uio *uio;
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int flag;
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{
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register struct tty *tp = &cons;
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return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
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}
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/* ARGSUSED */
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cnwrite(dev, uio, flag)
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dev_t dev;
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struct uio *uio;
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int flag;
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{
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register struct tty *tp;
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if ((tp = constty) == NULL ||
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(tp->t_state & (TS_CARR_ON|TS_ISOPEN)) != (TS_CARR_ON|TS_ISOPEN))
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tp = &cons;
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return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
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}
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cnioctl(dev, cmd, data, flag, p)
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dev_t dev;
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int cmd;
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caddr_t data;
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int flag;
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struct proc *p;
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{
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register struct tty *tp;
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int error;
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/*
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* Superuser can always use this to wrest control of console
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* output from the "virtual" console.
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*/
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if (cmd == TIOCCONS && constty) {
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error = suser(p->p_ucred, (u_short *)NULL);
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if (error)
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return (error);
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constty = NULL;
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return (0);
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}
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tp = &cons;
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if ((error = linesw[tp->t_line].l_ioctl(tp, cmd, data, flag, p)) >= 0)
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return (error);
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if ((error = ttioctl(tp, cmd, data, flag, p)) >= 0)
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return (error);
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return (ENOTTY);
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}
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cnselect(dev, which, p)
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dev_t dev;
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int which;
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struct proc *p;
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{
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return (ttselect(makedev(major(dev), 0), which, p));
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}
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/*
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* The rest of this code is run only when we are using the ROM vectors.
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*/
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/*
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* Generic output. We just call putchar. (Very bad for performance.)
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*/
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static void
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cnstart(tp)
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register struct tty *tp;
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{
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register int c, s;
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register void (*putc)(int);
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s = spltty();
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if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) {
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splx(s);
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return;
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}
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putc = promvec->pv_putchar;
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while (tp->t_outq.c_cc) {
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c = getc(&tp->t_outq);
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/*
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* *%&!*& ROM monitor console putchar is not reentrant!
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* splhigh/tty around it so as not to run so long with
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* clock interrupts blocked.
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*/
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(void) splhigh();
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(*putc)(c & 0177);
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(void) spltty();
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}
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if (tp->t_state & TS_ASLEEP) { /* can't happen? */
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tp->t_state &= ~TS_ASLEEP;
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wakeup((caddr_t)&tp->t_outq);
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}
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selwakeup(&tp->t_wsel);
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splx(s);
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}
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void
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cnstop(tp, flag)
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register struct tty *tp;
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int flag;
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{
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(*fcnstop)(tp, flag);
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}
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/*
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* Frame buffer output.
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* We use pseudo-DMA, via the ROM `write string' function, called from
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* software clock interrupts.
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*/
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static void
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cnfbstart(tp)
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register struct tty *tp;
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{
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register int s;
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s = spltty(); /* paranoid: splsoftclock should suffice */
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if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) {
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splx(s);
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return;
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}
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/*
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* If there are sleepers, and output has drained below low
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* water mark, awaken.
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*/
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if (tp->t_outq.c_cc <= tp->t_lowat) {
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if (tp->t_state & TS_ASLEEP) {
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tp->t_state &= ~TS_ASLEEP;
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wakeup((caddr_t)&tp->t_outq);
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}
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selwakeup(&tp->t_wsel);
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}
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if (tp->t_outq.c_cc) {
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tp->t_state |= TS_BUSY;
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if (s == 0) {
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(void) splsoftclock();
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cnfbdma((void *)tp);
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} else
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timeout(cnfbdma, tp, 1);
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}
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splx(s);
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}
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/*
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* Stop frame buffer output: just assert TS_FLUSH if necessary.
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*/
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static void
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cnfbstop(tp, flag)
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register struct tty *tp;
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int flag;
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{
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register int s = spltty(); /* paranoid */
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if ((tp->t_state & (TS_BUSY | TS_TTSTOP)) == TS_BUSY)
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tp->t_state |= TS_FLUSH;
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splx(s);
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}
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/*
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* Do pseudo-dma (called from software interrupt).
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*/
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static void
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cnfbdma(tpaddr)
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void *tpaddr;
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{
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register struct tty *tp = tpaddr;
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register char *p, *q;
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register int n, c, s;
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s = spltty(); /* paranoid */
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if (tp->t_state & TS_FLUSH) {
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tp->t_state &= ~(TS_BUSY | TS_FLUSH);
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splx(s);
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} else {
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tp->t_state &= ~TS_BUSY;
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splx(s);
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p = tp->t_outq.c_cf;
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n = ndqb(&tp->t_outq, 0);
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for (q = p, c = n; --c >= 0; q++)
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if (*q & 0200) /* high bits seem to be bad */
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*q &= ~0200;
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(*promvec->pv_putstr)(p, n);
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ndflush(&tp->t_outq, n);
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}
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if (tp->t_line)
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(*linesw[tp->t_line].l_start)(tp);
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else
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cnfbstart(tp);
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}
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/*
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* The following is for rom console input. The rom will not call
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* an `interrupt' routine on console input ready, so we must poll.
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* This is all rather sad.
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*/
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volatile int cn_rxc; /* XXX receive `silo' */
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/* called from hardclock, which is above spltty, so no tty calls! */
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cnrom()
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{
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register int c;
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if (cn_rxc >= 0)
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return (1);
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if ((c = (*promvec->pv_nbgetchar)()) < 0)
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return (0);
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cn_rxc = c;
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return (1);
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}
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/* pseudo console software interrupt scheduled when cnrom() returns 1 */
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cnrint()
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{
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register struct tty *tp;
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register int c, s;
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s = splclock();
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c = cn_rxc;
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cn_rxc = -1;
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splx(s);
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if (c < 0)
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return;
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tp = &cons;
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if ((tp->t_cflag & CSIZE) == CS7) {
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/* XXX this should be done elsewhere, if at all */
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if (tp->t_cflag & PARENB)
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if (tp->t_cflag & PARODD ?
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(char_type[c & 0177] & 0200) == (c & 0200) :
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(char_type[c & 0177] & 0200) != (c & 0200))
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c |= TTY_PE;
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c &= ~0200;
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}
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(*linesw[tp->t_line].l_rint)(c, tp);
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}
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cngetc()
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{
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register int s, c;
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s = splhigh();
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c = (*promvec->pv_getchar)();
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splx(s);
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if (c == '\r')
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c = '\n';
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return (c);
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}
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cnputc(c)
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register int c;
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{
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register int s = splhigh();
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if (c == '\n')
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(*promvec->pv_putchar)('\r');
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(*promvec->pv_putchar)(c);
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splx(s);
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}
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