freebsd-dev/sys/kern/subr_terminal.c
Jean-Sébastien Pédron da49f6bcc3 vt(4): Adjust the cursor position after changing the window size
A new terminal_set_cursor() is added: it wraps the existing
teken_set_cursor() function.

In vtbuf_grow(), the cursor position is adjusted at the end of the
function. In vt_change_font(), we call terminal_set_cursor() just after
terminal_set_winsize_blank(), while the terminal is mute.

This fixes a bug where, after loading a kernel video driver which
increases the terminal window size, the cursor remains at its old
position, in other words, in the middle of the display content.

PR:		194421
MFC after:	1 week
2014-11-01 17:05:15 +00:00

632 lines
14 KiB
C

/*-
* Copyright (c) 2009 The FreeBSD Foundation
* All rights reserved.
*
* This software was developed by Ed Schouten under sponsorship from the
* FreeBSD Foundation.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/cons.h>
#include <sys/consio.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/systm.h>
#include <sys/terminal.h>
#include <sys/tty.h>
#include <machine/stdarg.h>
static MALLOC_DEFINE(M_TERMINAL, "terminal", "terminal device");
/*
* Locking.
*
* Normally we don't need to lock down the terminal emulator, because
* the TTY lock is already held when calling teken_input().
* Unfortunately this is not the case when the terminal acts as a
* console device, because cnputc() can be called at the same time.
* This means terminals may need to be locked down using a spin lock.
*/
#define TERMINAL_LOCK(tm) do { \
if ((tm)->tm_flags & TF_CONS) \
mtx_lock_spin(&(tm)->tm_mtx); \
else if ((tm)->tm_tty != NULL) \
tty_lock((tm)->tm_tty); \
} while (0)
#define TERMINAL_UNLOCK(tm) do { \
if ((tm)->tm_flags & TF_CONS) \
mtx_unlock_spin(&(tm)->tm_mtx); \
else if ((tm)->tm_tty != NULL) \
tty_unlock((tm)->tm_tty); \
} while (0)
#define TERMINAL_LOCK_TTY(tm) do { \
if ((tm)->tm_flags & TF_CONS) \
mtx_lock_spin(&(tm)->tm_mtx); \
} while (0)
#define TERMINAL_UNLOCK_TTY(tm) do { \
if ((tm)->tm_flags & TF_CONS) \
mtx_unlock_spin(&(tm)->tm_mtx); \
} while (0)
#define TERMINAL_LOCK_CONS(tm) mtx_lock_spin(&(tm)->tm_mtx)
#define TERMINAL_UNLOCK_CONS(tm) mtx_unlock_spin(&(tm)->tm_mtx)
/*
* TTY routines.
*/
static tsw_open_t termtty_open;
static tsw_close_t termtty_close;
static tsw_outwakeup_t termtty_outwakeup;
static tsw_ioctl_t termtty_ioctl;
static tsw_mmap_t termtty_mmap;
static struct ttydevsw terminal_tty_class = {
.tsw_open = termtty_open,
.tsw_close = termtty_close,
.tsw_outwakeup = termtty_outwakeup,
.tsw_ioctl = termtty_ioctl,
.tsw_mmap = termtty_mmap,
};
/*
* Terminal emulator routines.
*/
static tf_bell_t termteken_bell;
static tf_cursor_t termteken_cursor;
static tf_putchar_t termteken_putchar;
static tf_fill_t termteken_fill;
static tf_copy_t termteken_copy;
static tf_param_t termteken_param;
static tf_respond_t termteken_respond;
static teken_funcs_t terminal_drawmethods = {
.tf_bell = termteken_bell,
.tf_cursor = termteken_cursor,
.tf_putchar = termteken_putchar,
.tf_fill = termteken_fill,
.tf_copy = termteken_copy,
.tf_param = termteken_param,
.tf_respond = termteken_respond,
};
/* Kernel message formatting. */
static const teken_attr_t kernel_message = {
.ta_fgcolor = TCHAR_FGCOLOR(TERMINAL_KERN_ATTR),
.ta_bgcolor = TCHAR_BGCOLOR(TERMINAL_KERN_ATTR),
.ta_format = TCHAR_FORMAT(TERMINAL_KERN_ATTR)
};
static const teken_attr_t default_message = {
.ta_fgcolor = TCHAR_FGCOLOR(TERMINAL_NORM_ATTR),
.ta_bgcolor = TCHAR_BGCOLOR(TERMINAL_NORM_ATTR),
.ta_format = TCHAR_FORMAT(TERMINAL_NORM_ATTR)
};
#define TCHAR_CREATE(c, a) ((c) | TFORMAT((a)->ta_format) | \
TCOLOR_FG(teken_256to8((a)->ta_fgcolor)) | \
TCOLOR_BG(teken_256to8((a)->ta_bgcolor)))
static void
terminal_init(struct terminal *tm)
{
if (tm->tm_flags & TF_CONS)
mtx_init(&tm->tm_mtx, "trmlck", NULL, MTX_SPIN);
teken_init(&tm->tm_emulator, &terminal_drawmethods, tm);
teken_set_defattr(&tm->tm_emulator, &default_message);
}
struct terminal *
terminal_alloc(const struct terminal_class *tc, void *softc)
{
struct terminal *tm;
tm = malloc(sizeof(struct terminal), M_TERMINAL, M_WAITOK|M_ZERO);
terminal_init(tm);
tm->tm_class = tc;
tm->tm_softc = softc;
return (tm);
}
static void
terminal_sync_ttysize(struct terminal *tm)
{
struct tty *tp;
tp = tm->tm_tty;
if (tp == NULL)
return;
tty_lock(tp);
tty_set_winsize(tp, &tm->tm_winsize);
tty_unlock(tp);
}
void
terminal_maketty(struct terminal *tm, const char *fmt, ...)
{
struct tty *tp;
char name[8];
va_list ap;
va_start(ap, fmt);
vsnrprintf(name, sizeof name, 32, fmt, ap);
va_end(ap);
tp = tty_alloc(&terminal_tty_class, tm);
tty_makedev(tp, NULL, "%s", name);
tm->tm_tty = tp;
terminal_sync_ttysize(tm);
}
void
terminal_set_cursor(struct terminal *tm, const term_pos_t *pos)
{
teken_set_cursor(&tm->tm_emulator, pos);
}
void
terminal_set_winsize_blank(struct terminal *tm, const struct winsize *size,
int blank, const term_attr_t *attr)
{
term_rect_t r;
tm->tm_winsize = *size;
r.tr_begin.tp_row = r.tr_begin.tp_col = 0;
r.tr_end.tp_row = size->ws_row;
r.tr_end.tp_col = size->ws_col;
TERMINAL_LOCK(tm);
if (blank == 0)
teken_set_winsize_noreset(&tm->tm_emulator, &r.tr_end);
else
teken_set_winsize(&tm->tm_emulator, &r.tr_end);
TERMINAL_UNLOCK(tm);
if ((blank != 0) && !(tm->tm_flags & TF_MUTE))
tm->tm_class->tc_fill(tm, &r,
TCHAR_CREATE((teken_char_t)' ', attr));
terminal_sync_ttysize(tm);
}
void
terminal_set_winsize(struct terminal *tm, const struct winsize *size)
{
terminal_set_winsize_blank(tm, size, 1,
(const term_attr_t *)&default_message);
}
/*
* XXX: This function is a kludge. Drivers like vt(4) need to
* temporarily stop input when resizing, etc. This should ideally be
* handled within the driver.
*/
void
terminal_mute(struct terminal *tm, int yes)
{
TERMINAL_LOCK(tm);
if (yes)
tm->tm_flags |= TF_MUTE;
else
tm->tm_flags &= ~TF_MUTE;
TERMINAL_UNLOCK(tm);
}
void
terminal_input_char(struct terminal *tm, term_char_t c)
{
struct tty *tp;
tp = tm->tm_tty;
if (tp == NULL)
return;
/*
* Strip off any attributes. Also ignore input of second part of
* CJK fullwidth characters, as we don't want to return these
* characters twice.
*/
if (TCHAR_FORMAT(c) & TF_CJK_RIGHT)
return;
c = TCHAR_CHARACTER(c);
tty_lock(tp);
/*
* Conversion to UTF-8.
*/
if (c < 0x80) {
ttydisc_rint(tp, c, 0);
} else if (c < 0x800) {
char str[2] = {
0xc0 | (c >> 6),
0x80 | (c & 0x3f)
};
ttydisc_rint_simple(tp, str, sizeof str);
} else if (c < 0x10000) {
char str[3] = {
0xe0 | (c >> 12),
0x80 | ((c >> 6) & 0x3f),
0x80 | (c & 0x3f)
};
ttydisc_rint_simple(tp, str, sizeof str);
} else {
char str[4] = {
0xf0 | (c >> 18),
0x80 | ((c >> 12) & 0x3f),
0x80 | ((c >> 6) & 0x3f),
0x80 | (c & 0x3f)
};
ttydisc_rint_simple(tp, str, sizeof str);
}
ttydisc_rint_done(tp);
tty_unlock(tp);
}
void
terminal_input_raw(struct terminal *tm, char c)
{
struct tty *tp;
tp = tm->tm_tty;
if (tp == NULL)
return;
tty_lock(tp);
ttydisc_rint(tp, c, 0);
ttydisc_rint_done(tp);
tty_unlock(tp);
}
void
terminal_input_special(struct terminal *tm, unsigned int k)
{
struct tty *tp;
const char *str;
tp = tm->tm_tty;
if (tp == NULL)
return;
str = teken_get_sequence(&tm->tm_emulator, k);
if (str == NULL)
return;
tty_lock(tp);
ttydisc_rint_simple(tp, str, strlen(str));
ttydisc_rint_done(tp);
tty_unlock(tp);
}
/*
* Binding with the TTY layer.
*/
static int
termtty_open(struct tty *tp)
{
struct terminal *tm = tty_softc(tp);
tm->tm_class->tc_opened(tm, 1);
return (0);
}
static void
termtty_close(struct tty *tp)
{
struct terminal *tm = tty_softc(tp);
tm->tm_class->tc_opened(tm, 0);
}
static void
termtty_outwakeup(struct tty *tp)
{
struct terminal *tm = tty_softc(tp);
char obuf[128];
size_t olen;
unsigned int flags = 0;
while ((olen = ttydisc_getc(tp, obuf, sizeof obuf)) > 0) {
TERMINAL_LOCK_TTY(tm);
if (!(tm->tm_flags & TF_MUTE)) {
tm->tm_flags &= ~TF_BELL;
teken_input(&tm->tm_emulator, obuf, olen);
flags |= tm->tm_flags;
}
TERMINAL_UNLOCK_TTY(tm);
}
tm->tm_class->tc_done(tm);
if (flags & TF_BELL)
tm->tm_class->tc_bell(tm);
}
static int
termtty_ioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td)
{
struct terminal *tm = tty_softc(tp);
int error;
switch (cmd) {
case CONS_GETINFO: {
vid_info_t *vi = (vid_info_t *)data;
const teken_pos_t *p;
int fg, bg;
if (vi->size != sizeof(vid_info_t))
return (EINVAL);
/* Already help the console driver by filling in some data. */
p = teken_get_cursor(&tm->tm_emulator);
vi->mv_row = p->tp_row;
vi->mv_col = p->tp_col;
p = teken_get_winsize(&tm->tm_emulator);
vi->mv_rsz = p->tp_row;
vi->mv_csz = p->tp_col;
teken_get_defattr_cons25(&tm->tm_emulator, &fg, &bg);
vi->mv_norm.fore = fg;
vi->mv_norm.back = bg;
/* XXX: keep vidcontrol happy; bold backgrounds. */
vi->mv_rev.fore = bg;
vi->mv_rev.back = fg & 0x7;
break;
}
}
/*
* Unlike various other drivers, this driver will never
* deallocate TTYs. This means it's safe to temporarily unlock
* the TTY when handling ioctls.
*/
tty_unlock(tp);
error = tm->tm_class->tc_ioctl(tm, cmd, data, td);
tty_lock(tp);
return (error);
}
static int
termtty_mmap(struct tty *tp, vm_ooffset_t offset, vm_paddr_t * paddr,
int nprot, vm_memattr_t *memattr)
{
struct terminal *tm = tty_softc(tp);
return (tm->tm_class->tc_mmap(tm, offset, paddr, nprot, memattr));
}
/*
* Binding with the kernel and debug console.
*/
static cn_probe_t termcn_cnprobe;
static cn_init_t termcn_cninit;
static cn_term_t termcn_cnterm;
static cn_getc_t termcn_cngetc;
static cn_putc_t termcn_cnputc;
static cn_grab_t termcn_cngrab;
static cn_ungrab_t termcn_cnungrab;
const struct consdev_ops termcn_cnops = {
.cn_probe = termcn_cnprobe,
.cn_init = termcn_cninit,
.cn_term = termcn_cnterm,
.cn_getc = termcn_cngetc,
.cn_putc = termcn_cnputc,
.cn_grab = termcn_cngrab,
.cn_ungrab = termcn_cnungrab,
};
void
termcn_cnregister(struct terminal *tm)
{
struct consdev *cp;
cp = tm->consdev;
if (cp == NULL) {
cp = malloc(sizeof(struct consdev), M_TERMINAL,
M_WAITOK|M_ZERO);
cp->cn_ops = &termcn_cnops;
cp->cn_arg = tm;
cp->cn_pri = CN_INTERNAL;
sprintf(cp->cn_name, "ttyv0");
tm->tm_flags = TF_CONS;
tm->consdev = cp;
terminal_init(tm);
}
/* Attach terminal as console. */
cnadd(cp);
}
static void
termcn_cngrab(struct consdev *cp)
{
struct terminal *tm = cp->cn_arg;
tm->tm_class->tc_cngrab(tm);
}
static void
termcn_cnungrab(struct consdev *cp)
{
struct terminal *tm = cp->cn_arg;
tm->tm_class->tc_cnungrab(tm);
}
static void
termcn_cnprobe(struct consdev *cp)
{
struct terminal *tm = cp->cn_arg;
if (tm == NULL) {
cp->cn_pri = CN_DEAD;
return;
}
tm->consdev = cp;
terminal_init(tm);
tm->tm_class->tc_cnprobe(tm, cp);
}
static void
termcn_cninit(struct consdev *cp)
{
}
static void
termcn_cnterm(struct consdev *cp)
{
}
static int
termcn_cngetc(struct consdev *cp)
{
struct terminal *tm = cp->cn_arg;
return (tm->tm_class->tc_cngetc(tm));
}
static void
termcn_cnputc(struct consdev *cp, int c)
{
struct terminal *tm = cp->cn_arg;
teken_attr_t backup;
char cv = c;
TERMINAL_LOCK_CONS(tm);
if (!(tm->tm_flags & TF_MUTE)) {
backup = *teken_get_curattr(&tm->tm_emulator);
teken_set_curattr(&tm->tm_emulator, &kernel_message);
teken_input(&tm->tm_emulator, &cv, 1);
teken_set_curattr(&tm->tm_emulator, &backup);
}
TERMINAL_UNLOCK_CONS(tm);
tm->tm_class->tc_done(tm);
}
/*
* Binding with the terminal emulator.
*/
static void
termteken_bell(void *softc)
{
struct terminal *tm = softc;
tm->tm_flags |= TF_BELL;
}
static void
termteken_cursor(void *softc, const teken_pos_t *p)
{
struct terminal *tm = softc;
tm->tm_class->tc_cursor(tm, p);
}
static void
termteken_putchar(void *softc, const teken_pos_t *p, teken_char_t c,
const teken_attr_t *a)
{
struct terminal *tm = softc;
tm->tm_class->tc_putchar(tm, p, TCHAR_CREATE(c, a));
}
static void
termteken_fill(void *softc, const teken_rect_t *r, teken_char_t c,
const teken_attr_t *a)
{
struct terminal *tm = softc;
tm->tm_class->tc_fill(tm, r, TCHAR_CREATE(c, a));
}
static void
termteken_copy(void *softc, const teken_rect_t *r, const teken_pos_t *p)
{
struct terminal *tm = softc;
tm->tm_class->tc_copy(tm, r, p);
}
static void
termteken_param(void *softc, int cmd, unsigned int arg)
{
struct terminal *tm = softc;
tm->tm_class->tc_param(tm, cmd, arg);
}
static void
termteken_respond(void *softc, const void *buf, size_t len)
{
#if 0
struct terminal *tm = softc;
struct tty *tp;
/*
* Only inject a response into the TTY if the data actually
* originated from the TTY.
*
* XXX: This cannot be done right now. The TTY could pick up
* other locks. It could also in theory cause loops, when the
* TTY performs echoing of a command that generates even more
* input.
*/
tp = tm->tm_tty;
if (tp == NULL)
return;
ttydisc_rint_simple(tp, buf, len);
ttydisc_rint_done(tp);
#endif
}