NetBSD/sys/arch/sparc/dev/cons.c

460 lines
10 KiB
C

/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Lawrence Berkeley Laboratory.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)cons.c 8.1 (Berkeley) 7/19/93
*
* from: Header: cons.c,v 1.12 93/07/20 00:49:45 torek Exp
* $Id: cons.c,v 1.5 1993/11/10 15:06:41 deraadt Exp $
*/
/*
* Console (indirect) driver.
*/
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/file.h>
#include <sys/conf.h>
#include <machine/bsd_openprom.h>
#include <machine/psl.h>
#include "zs.h"
struct tty *constty = 0; /* virtual console output device */
struct tty *fbconstty = 0; /* tty structure for frame buffer console */
int rom_console_input; /* when set, hardclock calls cnrom() */
int cons_ocount; /* output byte count */
extern struct promvec *promvec;
/*
* The output driver may munge the minor number in cons.t_dev.
*/
struct tty cons; /* rom console tty device */
struct tty *cn_tty[1] = { &cons };
static void (*fcnstop) __P((struct tty *, int));
static void cnstart __P((struct tty *));
void cnstop __P((struct tty *, int));
static void cnfbstart __P((struct tty *));
static void cnfbstop __P((struct tty *, int));
static void cnfbdma __P((void *));
extern char partab[];
void
consinit()
{
register struct tty *tp = &cons;
register int in, out;
void zsconsole(), bwtwoconsole();
tp->t_dev = makedev(0, 0); /* /dev/console */
tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
tp->t_param = (int (*)(struct tty *, struct termios *))nullop;
in = *promvec->pv_stdin;
out = *promvec->pv_stdout;
switch (in) {
#if NZS > 0
case PROMDEV_TTYA:
zsconsole(tp, 0, 0, NULL);
break;
case PROMDEV_TTYB:
zsconsole(tp, 1, 0, NULL);
break;
#endif
case PROMDEV_KBD:
/*
* Tell the keyboard driver to direct ASCII input here.
*/
kbd_ascii(tp);
break;
default:
rom_console_input = 1;
printf("unknown console input source %d; using rom\n", in);
break;
}
switch (out) {
#if NZS > 0
case PROMDEV_TTYA:
zsconsole(tp, 0, 1, &fcnstop);
break;
case PROMDEV_TTYB:
zsconsole(tp, 1, 1, &fcnstop);
break;
#endif
case PROMDEV_SCREEN:
fbconstty = tp;
tp->t_oproc = cnfbstart;
fcnstop = cnfbstop;
break;
default:
printf("unknown console output sink %d; using rom\n", out);
tp->t_oproc = cnstart;
fcnstop = (void (*)(struct tty *, int))nullop;
break;
}
}
/* ARGSUSED */
cnopen(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
register struct tty *tp = &cons;
static int firstopen = 1;
if(firstopen) {
clalloc(&tp->t_rawq, 1024, 1);
clalloc(&tp->t_canq, 1024, 1);
/* output queue doesn't need quoting */
clalloc(&tp->t_outq, 1024, 0);
firstopen = 0;
}
if ((tp->t_state & TS_ISOPEN) == 0) {
/*
* Leave baud rate alone!
*/
ttychars(tp);
tp->t_iflag = TTYDEF_IFLAG;
tp->t_oflag = TTYDEF_OFLAG;
tp->t_lflag = TTYDEF_LFLAG;
tp->t_cflag = TTYDEF_CFLAG;
tp->t_state = TS_ISOPEN | TS_CARR_ON;
(void)(*tp->t_param)(tp, &tp->t_termios);
ttsetwater(tp);
} else if (tp->t_state & TS_XCLUDE && p->p_ucred->cr_uid != 0)
return (EBUSY);
return ((*linesw[tp->t_line].l_open)(dev, tp));
}
/* ARGSUSED */
cnclose(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
register struct tty *tp = &cons;
(*linesw[tp->t_line].l_close)(tp, flag);
ttyclose(tp);
return (0);
}
/* ARGSUSED */
cnread(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
register struct tty *tp = &cons;
return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
}
/* ARGSUSED */
cnwrite(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
register struct tty *tp;
if ((tp = constty) == NULL ||
(tp->t_state & (TS_CARR_ON|TS_ISOPEN)) != (TS_CARR_ON|TS_ISOPEN))
tp = &cons;
return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
}
cnioctl(dev, cmd, data, flag, p)
dev_t dev;
int cmd;
caddr_t data;
int flag;
struct proc *p;
{
register struct tty *tp;
int error;
/*
* Superuser can always use this to wrest control of console
* output from the "virtual" console.
*/
if (cmd == TIOCCONS && constty) {
error = suser(p->p_ucred, (u_short *)NULL);
if (error)
return (error);
constty = NULL;
return (0);
}
tp = &cons;
if ((error = linesw[tp->t_line].l_ioctl(tp, cmd, data, flag)) >= 0)
return (error);
if ((error = ttioctl(tp, cmd, data, flag)) >= 0)
return (error);
return (ENOTTY);
}
cnselect(dev, which, p)
dev_t dev;
int which;
struct proc *p;
{
return (ttselect(makedev(major(dev), 0), which, p));
}
/*
* The rest of this code is run only when we are using the ROM vectors.
*/
/*
* Generic output. We just call putchar. (Very bad for performance.)
*/
static void
cnstart(tp)
register struct tty *tp;
{
register int c, s;
register void (*putc)(int);
s = spltty();
if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) {
splx(s);
return;
}
putc = promvec->pv_putchar;
while (tp->t_outq.c_cc) {
c = getc(&tp->t_outq);
/*
* *%&!*& ROM monitor console putchar is not reentrant!
* splhigh/tty around it so as not to run so long with
* clock interrupts blocked.
*/
(void) splhigh();
(*putc)(c & 0177);
(void) spltty();
}
if (tp->t_state & TS_ASLEEP) { /* can't happen? */
tp->t_state &= ~TS_ASLEEP;
wakeup((caddr_t)&tp->t_outq);
}
selwakeup(&tp->t_wsel);
splx(s);
}
void
cnstop(tp, flag)
register struct tty *tp;
int flag;
{
(*fcnstop)(tp, flag);
}
/*
* Frame buffer output.
* We use pseudo-DMA, via the ROM `write string' function, called from
* software clock interrupts.
*/
static void
cnfbstart(tp)
register struct tty *tp;
{
register int s;
s = spltty(); /* paranoid: splsoftclock should suffice */
if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) {
splx(s);
return;
}
/*
* If there are sleepers, and output has drained below low
* water mark, awaken.
*/
if (tp->t_outq.c_cc <= tp->t_lowat) {
if (tp->t_state & TS_ASLEEP) {
tp->t_state &= ~TS_ASLEEP;
wakeup((caddr_t)&tp->t_outq);
}
selwakeup(&tp->t_wsel);
}
if (tp->t_outq.c_cc) {
tp->t_state |= TS_BUSY;
if (s == 0) {
(void) splsoftclock();
cnfbdma((void *)tp);
} else
timeout((timeout_t)cnfbdma, (caddr_t)tp, 1);
}
splx(s);
}
/*
* Stop frame buffer output: just assert TS_FLUSH if necessary.
*/
static void
cnfbstop(tp, flag)
register struct tty *tp;
int flag;
{
register int s = spltty(); /* paranoid */
if ((tp->t_state & (TS_BUSY | TS_TTSTOP)) == TS_BUSY)
tp->t_state |= TS_FLUSH;
splx(s);
}
/*
* Do pseudo-dma (called from software interrupt).
*/
static void
cnfbdma(tpaddr)
void *tpaddr;
{
register struct tty *tp = tpaddr;
register char *p, *q;
register int n, c, s;
s = spltty(); /* paranoid */
if (tp->t_state & TS_FLUSH) {
tp->t_state &= ~(TS_BUSY | TS_FLUSH);
splx(s);
} else {
tp->t_state &= ~TS_BUSY;
splx(s);
p = tp->t_outq.c_cf;
n = ndqb(&tp->t_outq, 0);
for (q = p, c = n; --c >= 0; q++)
if (*q & 0200) /* high bits seem to be bad */
*q &= ~0200;
(*promvec->pv_putstr)(p, n);
ndflush(&tp->t_outq, n);
}
if (tp->t_line)
(*linesw[tp->t_line].l_start)(tp);
else
cnfbstart(tp);
}
/*
* The following is for rom console input. The rom will not call
* an `interrupt' routine on console input ready, so we must poll.
* This is all rather sad.
*/
volatile int cn_rxc; /* XXX receive `silo' */
/* called from hardclock, which is above spltty, so no tty calls! */
cnrom()
{
register int c;
if (cn_rxc >= 0)
return (1);
if ((c = (*promvec->pv_nbgetchar)()) < 0)
return (0);
cn_rxc = c;
return (1);
}
/* pseudo console software interrupt scheduled when cnrom() returns 1 */
cnrint()
{
register struct tty *tp;
register int c, s;
s = splclock();
c = cn_rxc;
cn_rxc = -1;
splx(s);
if (c < 0)
return;
tp = &cons;
if ((tp->t_cflag & CSIZE) == CS7) {
/* XXX this should be done elsewhere, if at all */
if (tp->t_cflag & PARENB)
if (tp->t_cflag & PARODD ?
(partab[c & 0177] & 0200) == (c & 0200) :
(partab[c & 0177] & 0200) != (c & 0200))
c |= TTY_PE;
c &= ~0200;
}
(*linesw[tp->t_line].l_rint)(c, tp);
}
cngetc()
{
register int s, c;
s = splhigh();
c = (*promvec->pv_getchar)();
splx(s);
if (c == '\r')
c = '\n';
return (c);
}
cnputc(c)
register int c;
{
register int s = splhigh();
if (c == '\n')
(*promvec->pv_putchar)('\r');
(*promvec->pv_putchar)(c);
splx(s);
}