NetBSD/sys/arch/sun3/dev/kd.c

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1995-04-27 03:20:15 +04:00
/* $NetBSD: kd.c,v 1.13 1995/04/26 23:20:15 gwr Exp $ */
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/*
* Copyright (c) 1994, 1995 Gordon W. Ross
* All rights reserved.
*
* 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.
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* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
* 4. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Gordon Ross
*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/*
* Keyboard/Display device.
*
* This driver exists simply to provide a tty device that
* the indirect console driver can point to.
* The kbd driver sends its input here.
* Output goes to the screen via PROM printf.
*/
#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 <sys/device.h>
#include <machine/autoconf.h>
#include <machine/mon.h>
#include <machine/psl.h>
#include <dev/cons.h>
#define BURST 64
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/*
* There is no point in pretending there might be
* more than one keyboard/display device.
*/
struct tty *kd_tty[1];
int kdopen(dev_t, int, int, struct proc *);
int kdclose(dev_t, int, int, struct proc *);
int kdread(dev_t, struct uio *, int);
int kdwrite(dev_t, struct uio *, int);
int kdioctl(dev_t, int, caddr_t, int, struct proc *);
static int kdparam(struct tty *, struct termios *);
static void kdstart(struct tty *);
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int kd_is_console;
/* This is called by kbd_serial() like a pseudo-device. */
void
kd_attach(n)
int n;
{
kd_tty[0] = ttymalloc();
/* Tell keyboard module where to send read data. */
kbd_ascii(kd_tty[0]);
}
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struct tty *
kdtty(dev)
dev_t dev;
{
return kd_tty[0];
}
int
kdopen(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
int error, unit;
struct tty *tp;
unit = minor(dev);
if (unit) return ENXIO;
tp = kd_tty[unit];
if (tp == NULL)
return ENXIO;
if ((error = kbd_iopen()) != 0) {
#ifdef DIAGNOSTIC
printf("kd: kbd_iopen, error=%d\n", error);
#endif
return (error);
}
tp->t_oproc = kdstart;
tp->t_param = kdparam;
tp->t_dev = dev;
if ((tp->t_state & TS_ISOPEN) == 0) {
tp->t_state |= TS_WOPEN;
ttychars(tp);
tp->t_iflag = TTYDEF_IFLAG;
tp->t_oflag = TTYDEF_OFLAG;
tp->t_cflag = TTYDEF_CFLAG;
tp->t_lflag = TTYDEF_LFLAG;
tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
kdparam(tp, &tp->t_termios);
ttsetwater(tp);
} else if (tp->t_state & TS_XCLUDE && p->p_ucred->cr_uid != 0)
return EBUSY;
tp->t_state |= TS_CARR_ON;
return ((*linesw[tp->t_line].l_open)(dev, tp));
}
int
kdclose(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
int unit = minor(dev);
struct tty *tp = kd_tty[unit];
(*linesw[tp->t_line].l_close)(tp, flag);
ttyclose(tp);
return (0);
}
int
kdread(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
int unit = minor(dev);
struct tty *tp = kd_tty[unit];
return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
}
int
kdwrite(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
int unit = minor(dev);
struct tty *tp = kd_tty[unit];
return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
}
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int
kdstop(tp, flag)
struct tty *tp;
int flag;
{
}
int
kdioctl(dev, cmd, data, flag, p)
dev_t dev;
int cmd;
caddr_t data;
int flag;
struct proc *p;
{
int error;
int unit = minor(dev);
struct tty *tp = kd_tty[unit];
error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
if (error >= 0)
return error;
error = ttioctl(tp, cmd, data, flag, p);
if (error >= 0)
return error;
/* Handle any ioctl commands specific to kbd/display. */
/* XXX - Send KB* ioctls to kbd module? */
/* XXX - Send FB* ioctls to fb module? */
return ENOTTY;
}
static void kd_later(void*);
static void kd_putfb(struct tty *);
void
kdstart(tp)
struct tty *tp;
{
struct clist *cl;
register int s;
s = spltty();
if (tp->t_state & (TS_BUSY|TS_TTSTOP|TS_TIMEOUT))
goto out;
cl = &tp->t_outq;
if (cl->c_cc) {
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if (kd_is_console) {
tp->t_state |= TS_BUSY;
if ((s & PSL_IPL) == 0) {
/* called at level zero - update screen now. */
(void) splsoftclock();
kd_putfb(tp);
(void) spltty();
tp->t_state &= ~TS_BUSY;
} else {
/* called at interrupt level - do it later */
timeout(kd_later, (void*)tp, 0);
}
} else {
/*
* This driver uses the PROM for writing the screen,
* and that only works if this is the console device.
* If this is not the console, just flush the output.
* Sorry. (In that case, use xdm instead of getty.)
*/
ndflush(cl, cl->c_cc);
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}
}
if (cl->c_cc <= tp->t_lowat) {
if (tp->t_state & TS_ASLEEP) {
tp->t_state &= ~TS_ASLEEP;
wakeup((caddr_t)cl);
}
selwakeup(&tp->t_wsel);
}
out:
splx(s);
}
/*
* Timeout function to do delayed writes to the screen.
* Called at splsoftclock when requested by kdstart.
*/
static void
kd_later(tpaddr)
void *tpaddr;
{
struct tty *tp = tpaddr;
register int s;
kd_putfb(tp);
s = spltty();
tp->t_state &= ~TS_BUSY;
if (tp->t_line)
(*linesw[tp->t_line].l_start)(tp);
else
kdstart(tp);
splx(s);
}
/*
* Put text on the screen using the PROM monitor.
* This can take a while, so to avoid missing
* interrupts, this is called at splsoftclock.
*/
static void kd_putfb(tp)
struct tty *tp;
{
char buf[BURST];
struct clist *cl = &tp->t_outq;
char *p, *end;
int len;
while ((len = q_to_b(cl, buf, BURST-1)) > 0) {
/* PROM will barf if high bits are set. */
p = buf;
end = buf + len;
while (p < end)
*p++ &= 0x7f;
(romVectorPtr->fbWriteStr)(buf, len);
}
}
static int
kdparam(tp, t)
struct tty *tp;
struct termios *t;
{
/* XXX - These are ignored... */
tp->t_ispeed = t->c_ispeed;
tp->t_ospeed = t->c_ospeed;
tp->t_cflag = t->c_cflag;
return 0;
}
/*
* kd console support
*/
extern int zscnprobe_kbd(), zscngetc(), kbd_translate();
kdcnprobe(cp)
struct consdev *cp;
{
int maj;
/* locate the major number */
for (maj = 0; maj < nchrdev; maj++)
if (cdevsw[maj].d_open == (void*)kdopen)
break;
/* initialize required fields */
cp->cn_dev = makedev(maj, 0);
cp->cn_pri = zscnprobe_kbd();
}
kdcninit(cp)
struct consdev *cp;
{
/* This prepares zscngetc() */
zs_set_conschan(1, 0);
/* This prepares kbd_translate() */
kbd_init_tables();
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/* Indicate that it is OK to use the PROM fbwrite */
kd_is_console = 1;
mon_printf("console on kd0 (keyboard/display)\n");
}
kdcngetc(dev)
dev_t dev;
{
int c;
do {
c = zscngetc(0);
c = kbd_translate(c);
} while (c == -1);
return (c);
}
kdcnputc(dev, c)
dev_t dev;
int c;
{
(romVectorPtr->fbWriteChar)(c & 0x7f);
}
extern void fb_unblank();
void kdcnpollc(dev, on)
dev_t dev;
int on;
{
if (on)
fb_unblank();
}