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linux/drivers/char/vt.c
Antonino A. Daplas 3b41dc1a3c [PATCH] console: Fix buffer copy on vc resize 
On a vc resize, the contents of the old screen buffer are transferred to the
new screenbuffer.  If the new screenbuffer is smaller than the old one, only
the contents from the bottom are copied to new.  If the contents of the old
buffer are located at the top, then the contents will not be copied to the new
buffer resulting in a blank screen.

This bug will happen only if the vc in question is not in the foreground.
Doing an fbset -a or con2fbmap will trigger this bug.

To fix this problem, base the start of the copy from the location of the
current cursor.  If the cursor is near the top of the buffer, copy the
contents at the top, and if the cursor is near the bottom of the buffer, then
copy the contents at the bottom.  In the unlikely case where the new row size
is greater than 2x smaller than the old one, and the cursor is in the middle,
copy 1/2 screenful from the top and bottom of the cursor position.

Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-09 13:58:00 -07:00

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/*
* linux/drivers/char/vt.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*/
/*
* Hopefully this will be a rather complete VT102 implementation.
*
* Beeping thanks to John T Kohl.
*
* Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
* Chars, and VT100 enhancements by Peter MacDonald.
*
* Copy and paste function by Andrew Haylett,
* some enhancements by Alessandro Rubini.
*
* Code to check for different video-cards mostly by Galen Hunt,
* <g-hunt@ee.utah.edu>
*
* Rudimentary ISO 10646/Unicode/UTF-8 character set support by
* Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
*
* Dynamic allocation of consoles, aeb@cwi.nl, May 1994
* Resizing of consoles, aeb, 940926
*
* Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
* <poe@daimi.aau.dk>
*
* User-defined bell sound, new setterm control sequences and printk
* redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
*
* APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
*
* Merge with the abstract console driver by Geert Uytterhoeven
* <geert@linux-m68k.org>, Jan 1997.
*
* Original m68k console driver modifications by
*
* - Arno Griffioen <arno@usn.nl>
* - David Carter <carter@cs.bris.ac.uk>
*
* The abstract console driver provides a generic interface for a text
* console. It supports VGA text mode, frame buffer based graphical consoles
* and special graphics processors that are only accessible through some
* registers (e.g. a TMS340x0 GSP).
*
* The interface to the hardware is specified using a special structure
* (struct consw) which contains function pointers to console operations
* (see <linux/console.h> for more information).
*
* Support for changeable cursor shape
* by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
*
* Ported to i386 and con_scrolldelta fixed
* by Emmanuel Marty <core@ggi-project.org>, April 1998
*
* Resurrected character buffers in videoram plus lots of other trickery
* by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
*
* Removed old-style timers, introduced console_timer, made timer
* deletion SMP-safe. 17Jun00, Andrew Morton <andrewm@uow.edu.au>
*
* Removed console_lock, enabled interrupts across all console operations
* 13 March 2001, Andrew Morton
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/kd.h>
#include <linux/slab.h>
#include <linux/major.h>
#include <linux/mm.h>
#include <linux/console.h>
#include <linux/init.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/vt_kern.h>
#include <linux/selection.h>
#include <linux/tiocl.h>
#include <linux/kbd_kern.h>
#include <linux/consolemap.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/config.h>
#include <linux/workqueue.h>
#include <linux/bootmem.h>
#include <linux/pm.h>
#include <linux/font.h>
#include <linux/bitops.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/uaccess.h>
const struct consw *conswitchp;
/* A bitmap for codes <32. A bit of 1 indicates that the code
* corresponding to that bit number invokes some special action
* (such as cursor movement) and should not be displayed as a
* glyph unless the disp_ctrl mode is explicitly enabled.
*/
#define CTRL_ACTION 0x0d00ff81
#define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
/*
* Here is the default bell parameters: 750HZ, 1/8th of a second
*/
#define DEFAULT_BELL_PITCH 750
#define DEFAULT_BELL_DURATION (HZ/8)
extern void vcs_make_devfs(struct tty_struct *tty);
extern void vcs_remove_devfs(struct tty_struct *tty);
extern void console_map_init(void);
#ifdef CONFIG_PROM_CONSOLE
extern void prom_con_init(void);
#endif
#ifdef CONFIG_MDA_CONSOLE
extern int mda_console_init(void);
#endif
struct vc vc_cons [MAX_NR_CONSOLES];
#ifndef VT_SINGLE_DRIVER
static const struct consw *con_driver_map[MAX_NR_CONSOLES];
#endif
static int con_open(struct tty_struct *, struct file *);
static void vc_init(struct vc_data *vc, unsigned int rows,
unsigned int cols, int do_clear);
static void gotoxy(struct vc_data *vc, int new_x, int new_y);
static void save_cur(struct vc_data *vc);
static void reset_terminal(struct vc_data *vc, int do_clear);
static void con_flush_chars(struct tty_struct *tty);
static void set_vesa_blanking(char __user *p);
static void set_cursor(struct vc_data *vc);
static void hide_cursor(struct vc_data *vc);
static void console_callback(void *ignored);
static void blank_screen_t(unsigned long dummy);
static void set_palette(struct vc_data *vc);
static int printable; /* Is console ready for printing? */
/*
* ignore_poke: don't unblank the screen when things are typed. This is
* mainly for the privacy of braille terminal users.
*/
static int ignore_poke;
int do_poke_blanked_console;
int console_blanked;
static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
static int blankinterval = 10*60*HZ;
static int vesa_off_interval;
static DECLARE_WORK(console_work, console_callback, NULL);
/*
* fg_console is the current virtual console,
* last_console is the last used one,
* want_console is the console we want to switch to,
* kmsg_redirect is the console for kernel messages,
*/
int fg_console;
int last_console;
int want_console = -1;
int kmsg_redirect;
/*
* For each existing display, we have a pointer to console currently visible
* on that display, allowing consoles other than fg_console to be refreshed
* appropriately. Unless the low-level driver supplies its own display_fg
* variable, we use this one for the "master display".
*/
static struct vc_data *master_display_fg;
/*
* Unfortunately, we need to delay tty echo when we're currently writing to the
* console since the code is (and always was) not re-entrant, so we schedule
* all flip requests to process context with schedule-task() and run it from
* console_callback().
*/
/*
* For the same reason, we defer scrollback to the console callback.
*/
static int scrollback_delta;
/*
* Hook so that the power management routines can (un)blank
* the console on our behalf.
*/
int (*console_blank_hook)(int);
static struct timer_list console_timer;
static int blank_state;
static int blank_timer_expired;
enum {
blank_off = 0,
blank_normal_wait,
blank_vesa_wait,
};
/*
* Low-Level Functions
*/
#define IS_FG(vc) ((vc)->vc_num == fg_console)
#ifdef VT_BUF_VRAM_ONLY
#define DO_UPDATE(vc) 0
#else
#define DO_UPDATE(vc) CON_IS_VISIBLE(vc)
#endif
static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
{
unsigned short *p;
if (!viewed)
p = (unsigned short *)(vc->vc_origin + offset);
else if (!vc->vc_sw->con_screen_pos)
p = (unsigned short *)(vc->vc_visible_origin + offset);
else
p = vc->vc_sw->con_screen_pos(vc, offset);
return p;
}
static inline void scrolldelta(int lines)
{
scrollback_delta += lines;
schedule_console_callback();
}
void schedule_console_callback(void)
{
schedule_work(&console_work);
}
static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
{
unsigned short *d, *s;
if (t+nr >= b)
nr = b - t - 1;
if (b > vc->vc_rows || t >= b || nr < 1)
return;
if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
return;
d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
vc->vc_size_row * nr);
}
static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
{
unsigned short *s;
unsigned int step;
if (t+nr >= b)
nr = b - t - 1;
if (b > vc->vc_rows || t >= b || nr < 1)
return;
if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
return;
s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
step = vc->vc_cols * nr;
scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
}
static void do_update_region(struct vc_data *vc, unsigned long start, int count)
{
#ifndef VT_BUF_VRAM_ONLY
unsigned int xx, yy, offset;
u16 *p;
p = (u16 *) start;
if (!vc->vc_sw->con_getxy) {
offset = (start - vc->vc_origin) / 2;
xx = offset % vc->vc_cols;
yy = offset / vc->vc_cols;
} else {
int nxx, nyy;
start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
xx = nxx; yy = nyy;
}
for(;;) {
u16 attrib = scr_readw(p) & 0xff00;
int startx = xx;
u16 *q = p;
while (xx < vc->vc_cols && count) {
if (attrib != (scr_readw(p) & 0xff00)) {
if (p > q)
vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
startx = xx;
q = p;
attrib = scr_readw(p) & 0xff00;
}
p++;
xx++;
count--;
}
if (p > q)
vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
if (!count)
break;
xx = 0;
yy++;
if (vc->vc_sw->con_getxy) {
p = (u16 *)start;
start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
}
}
#endif
}
void update_region(struct vc_data *vc, unsigned long start, int count)
{
WARN_CONSOLE_UNLOCKED();
if (DO_UPDATE(vc)) {
hide_cursor(vc);
do_update_region(vc, start, count);
set_cursor(vc);
}
}
/* Structure of attributes is hardware-dependent */
static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink, u8 _underline, u8 _reverse)
{
if (vc->vc_sw->con_build_attr)
return vc->vc_sw->con_build_attr(vc, _color, _intensity, _blink, _underline, _reverse);
#ifndef VT_BUF_VRAM_ONLY
/*
* ++roman: I completely changed the attribute format for monochrome
* mode (!can_do_color). The formerly used MDA (monochrome display
* adapter) format didn't allow the combination of certain effects.
* Now the attribute is just a bit vector:
* Bit 0..1: intensity (0..2)
* Bit 2 : underline
* Bit 3 : reverse
* Bit 7 : blink
*/
{
u8 a = vc->vc_color;
if (!vc->vc_can_do_color)
return _intensity |
(_underline ? 4 : 0) |
(_reverse ? 8 : 0) |
(_blink ? 0x80 : 0);
if (_underline)
a = (a & 0xf0) | vc->vc_ulcolor;
else if (_intensity == 0)
a = (a & 0xf0) | vc->vc_ulcolor;
if (_reverse)
a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
if (_blink)
a ^= 0x80;
if (_intensity == 2)
a ^= 0x08;
if (vc->vc_hi_font_mask == 0x100)
a <<= 1;
return a;
}
#else
return 0;
#endif
}
static void update_attr(struct vc_data *vc)
{
vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity, vc->vc_blink, vc->vc_underline, vc->vc_reverse ^ vc->vc_decscnm);
vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm) << 8) | ' ';
}
/* Note: inverting the screen twice should revert to the original state */
void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
{
unsigned short *p;
WARN_CONSOLE_UNLOCKED();
count /= 2;
p = screenpos(vc, offset, viewed);
if (vc->vc_sw->con_invert_region)
vc->vc_sw->con_invert_region(vc, p, count);
#ifndef VT_BUF_VRAM_ONLY
else {
u16 *q = p;
int cnt = count;
u16 a;
if (!vc->vc_can_do_color) {
while (cnt--) {
a = scr_readw(q);
a ^= 0x0800;
scr_writew(a, q);
q++;
}
} else if (vc->vc_hi_font_mask == 0x100) {
while (cnt--) {
a = scr_readw(q);
a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
scr_writew(a, q);
q++;
}
} else {
while (cnt--) {
a = scr_readw(q);
a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
scr_writew(a, q);
q++;
}
}
}
#endif
if (DO_UPDATE(vc))
do_update_region(vc, (unsigned long) p, count);
}
/* used by selection: complement pointer position */
void complement_pos(struct vc_data *vc, int offset)
{
static int old_offset = -1;
static unsigned short old;
static unsigned short oldx, oldy;
WARN_CONSOLE_UNLOCKED();
if (old_offset != -1 && old_offset >= 0 &&
old_offset < vc->vc_screenbuf_size) {
scr_writew(old, screenpos(vc, old_offset, 1));
if (DO_UPDATE(vc))
vc->vc_sw->con_putc(vc, old, oldy, oldx);
}
old_offset = offset;
if (offset != -1 && offset >= 0 &&
offset < vc->vc_screenbuf_size) {
unsigned short new;
unsigned short *p;
p = screenpos(vc, offset, 1);
old = scr_readw(p);
new = old ^ vc->vc_complement_mask;
scr_writew(new, p);
if (DO_UPDATE(vc)) {
oldx = (offset >> 1) % vc->vc_cols;
oldy = (offset >> 1) / vc->vc_cols;
vc->vc_sw->con_putc(vc, new, oldy, oldx);
}
}
}
static void insert_char(struct vc_data *vc, unsigned int nr)
{
unsigned short *p, *q = (unsigned short *)vc->vc_pos;
p = q + vc->vc_cols - nr - vc->vc_x;
while (--p >= q)
scr_writew(scr_readw(p), p + nr);
scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
vc->vc_need_wrap = 0;
if (DO_UPDATE(vc)) {
unsigned short oldattr = vc->vc_attr;
vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
vc->vc_cols - vc->vc_x - nr);
vc->vc_attr = vc->vc_video_erase_char >> 8;
while (nr--)
vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
vc->vc_attr = oldattr;
}
}
static void delete_char(struct vc_data *vc, unsigned int nr)
{
unsigned int i = vc->vc_x;
unsigned short *p = (unsigned short *)vc->vc_pos;
while (++i <= vc->vc_cols - nr) {
scr_writew(scr_readw(p+nr), p);
p++;
}
scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
vc->vc_need_wrap = 0;
if (DO_UPDATE(vc)) {
unsigned short oldattr = vc->vc_attr;
vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
vc->vc_cols - vc->vc_x - nr);
vc->vc_attr = vc->vc_video_erase_char >> 8;
while (nr--)
vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
vc->vc_cols - 1 - nr);
vc->vc_attr = oldattr;
}
}
static int softcursor_original;
static void add_softcursor(struct vc_data *vc)
{
int i = scr_readw((u16 *) vc->vc_pos);
u32 type = vc->vc_cursor_type;
if (! (type & 0x10)) return;
if (softcursor_original != -1) return;
softcursor_original = i;
i |= ((type >> 8) & 0xff00 );
i ^= ((type) & 0xff00 );
if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
scr_writew(i, (u16 *) vc->vc_pos);
if (DO_UPDATE(vc))
vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
}
static void hide_softcursor(struct vc_data *vc)
{
if (softcursor_original != -1) {
scr_writew(softcursor_original, (u16 *)vc->vc_pos);
if (DO_UPDATE(vc))
vc->vc_sw->con_putc(vc, softcursor_original,
vc->vc_y, vc->vc_x);
softcursor_original = -1;
}
}
static void hide_cursor(struct vc_data *vc)
{
if (vc == sel_cons)
clear_selection();
vc->vc_sw->con_cursor(vc, CM_ERASE);
hide_softcursor(vc);
}
static void set_cursor(struct vc_data *vc)
{
if (!IS_FG(vc) || console_blanked ||
vc->vc_mode == KD_GRAPHICS)
return;
if (vc->vc_deccm) {
if (vc == sel_cons)
clear_selection();
add_softcursor(vc);
if ((vc->vc_cursor_type & 0x0f) != 1)
vc->vc_sw->con_cursor(vc, CM_DRAW);
} else
hide_cursor(vc);
}
static void set_origin(struct vc_data *vc)
{
WARN_CONSOLE_UNLOCKED();
if (!CON_IS_VISIBLE(vc) ||
!vc->vc_sw->con_set_origin ||
!vc->vc_sw->con_set_origin(vc))
vc->vc_origin = (unsigned long)vc->vc_screenbuf;
vc->vc_visible_origin = vc->vc_origin;
vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
}
static inline void save_screen(struct vc_data *vc)
{
WARN_CONSOLE_UNLOCKED();
if (vc->vc_sw->con_save_screen)
vc->vc_sw->con_save_screen(vc);
}
/*
* Redrawing of screen
*/
static void clear_buffer_attributes(struct vc_data *vc)
{
unsigned short *p = (unsigned short *)vc->vc_origin;
int count = vc->vc_screenbuf_size / 2;
int mask = vc->vc_hi_font_mask | 0xff;
for (; count > 0; count--, p++) {
scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
}
}
void redraw_screen(struct vc_data *vc, int is_switch)
{
int redraw = 0;
WARN_CONSOLE_UNLOCKED();
if (!vc) {
/* strange ... */
/* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
return;
}
if (is_switch) {
struct vc_data *old_vc = vc_cons[fg_console].d;
if (old_vc == vc)
return;
if (!CON_IS_VISIBLE(vc))
redraw = 1;
*vc->vc_display_fg = vc;
fg_console = vc->vc_num;
hide_cursor(old_vc);
if (!CON_IS_VISIBLE(old_vc)) {
save_screen(old_vc);
set_origin(old_vc);
}
} else {
hide_cursor(vc);
redraw = 1;
}
if (redraw) {
int update;
int old_was_color = vc->vc_can_do_color;
set_origin(vc);
update = vc->vc_sw->con_switch(vc);
set_palette(vc);
/*
* If console changed from mono<->color, the best we can do
* is to clear the buffer attributes. As it currently stands,
* rebuilding new attributes from the old buffer is not doable
* without overly complex code.
*/
if (old_was_color != vc->vc_can_do_color) {
update_attr(vc);
clear_buffer_attributes(vc);
}
if (update && vc->vc_mode != KD_GRAPHICS)
do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
}
set_cursor(vc);
if (is_switch) {
set_leds();
compute_shiftstate();
}
}
/*
* Allocation, freeing and resizing of VTs.
*/
int vc_cons_allocated(unsigned int i)
{
return (i < MAX_NR_CONSOLES && vc_cons[i].d);
}
static void visual_init(struct vc_data *vc, int num, int init)
{
/* ++Geert: vc->vc_sw->con_init determines console size */
if (vc->vc_sw)
module_put(vc->vc_sw->owner);
vc->vc_sw = conswitchp;
#ifndef VT_SINGLE_DRIVER
if (con_driver_map[num])
vc->vc_sw = con_driver_map[num];
#endif
__module_get(vc->vc_sw->owner);
vc->vc_num = num;
vc->vc_display_fg = &master_display_fg;
vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
vc->vc_uni_pagedir = 0;
vc->vc_hi_font_mask = 0;
vc->vc_complement_mask = 0;
vc->vc_can_do_color = 0;
vc->vc_sw->con_init(vc, init);
if (!vc->vc_complement_mask)
vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
vc->vc_s_complement_mask = vc->vc_complement_mask;
vc->vc_size_row = vc->vc_cols << 1;
vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
}
int vc_allocate(unsigned int currcons) /* return 0 on success */
{
WARN_CONSOLE_UNLOCKED();
if (currcons >= MAX_NR_CONSOLES)
return -ENXIO;
if (!vc_cons[currcons].d) {
struct vc_data *vc;
/* prevent users from taking too much memory */
if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
return -EPERM;
/* due to the granularity of kmalloc, we waste some memory here */
/* the alloc is done in two steps, to optimize the common situation
of a 25x80 console (structsize=216, screenbuf_size=4000) */
/* although the numbers above are not valid since long ago, the
point is still up-to-date and the comment still has its value
even if only as a historical artifact. --mj, July 1998 */
vc = kmalloc(sizeof(struct vc_data), GFP_KERNEL);
if (!vc)
return -ENOMEM;
memset(vc, 0, sizeof(*vc));
vc_cons[currcons].d = vc;
visual_init(vc, currcons, 1);
if (!*vc->vc_uni_pagedir_loc)
con_set_default_unimap(vc);
vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
if (!vc->vc_screenbuf) {
kfree(vc);
vc_cons[currcons].d = NULL;
return -ENOMEM;
}
vc->vc_kmalloced = 1;
vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
}
return 0;
}
static inline int resize_screen(struct vc_data *vc, int width, int height)
{
/* Resizes the resolution of the display adapater */
int err = 0;
if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
err = vc->vc_sw->con_resize(vc, width, height);
return err;
}
/*
* Change # of rows and columns (0 means unchanged/the size of fg_console)
* [this is to be used together with some user program
* like resize that changes the hardware videomode]
*/
#define VC_RESIZE_MAXCOL (32767)
#define VC_RESIZE_MAXROW (32767)
int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
{
unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
unsigned int old_cols, old_rows, old_row_size, old_screen_size;
unsigned int new_cols, new_rows, new_row_size, new_screen_size;
unsigned int end;
unsigned short *newscreen;
WARN_CONSOLE_UNLOCKED();
if (!vc)
return -ENXIO;
if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
return -EINVAL;
new_cols = (cols ? cols : vc->vc_cols);
new_rows = (lines ? lines : vc->vc_rows);
new_row_size = new_cols << 1;
new_screen_size = new_row_size * new_rows;
if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
return 0;
newscreen = (unsigned short *) kmalloc(new_screen_size, GFP_USER);
if (!newscreen)
return -ENOMEM;
old_rows = vc->vc_rows;
old_cols = vc->vc_cols;
old_row_size = vc->vc_size_row;
old_screen_size = vc->vc_screenbuf_size;
err = resize_screen(vc, new_cols, new_rows);
if (err) {
kfree(newscreen);
return err;
}
vc->vc_rows = new_rows;
vc->vc_cols = new_cols;
vc->vc_size_row = new_row_size;
vc->vc_screenbuf_size = new_screen_size;
rlth = min(old_row_size, new_row_size);
rrem = new_row_size - rlth;
old_origin = vc->vc_origin;
new_origin = (long) newscreen;
new_scr_end = new_origin + new_screen_size;
if (vc->vc_y > new_rows) {
if (old_rows - vc->vc_y < new_rows) {
/*
* Cursor near the bottom, copy contents from the
* bottom of buffer
*/
old_origin += (old_rows - new_rows) * old_row_size;
end = vc->vc_scr_end;
} else {
/*
* Cursor is in no man's land, copy 1/2 screenful
* from the top and bottom of cursor position
*/
old_origin += (vc->vc_y - new_rows/2) * old_row_size;
end = old_origin + new_screen_size;
}
} else
/*
* Cursor near the top, copy contents from the top of buffer
*/
end = (old_rows > new_rows) ? old_origin + new_screen_size :
vc->vc_scr_end;
update_attr(vc);
while (old_origin < end) {
scr_memcpyw((unsigned short *) new_origin,
(unsigned short *) old_origin, rlth);
if (rrem)
scr_memsetw((void *)(new_origin + rlth),
vc->vc_video_erase_char, rrem);
old_origin += old_row_size;
new_origin += new_row_size;
}
if (new_scr_end > new_origin)
scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
new_scr_end - new_origin);
if (vc->vc_kmalloced)
kfree(vc->vc_screenbuf);
vc->vc_screenbuf = newscreen;
vc->vc_kmalloced = 1;
vc->vc_screenbuf_size = new_screen_size;
set_origin(vc);
/* do part of a reset_terminal() */
vc->vc_top = 0;
vc->vc_bottom = vc->vc_rows;
gotoxy(vc, vc->vc_x, vc->vc_y);
save_cur(vc);
if (vc->vc_tty) {
struct winsize ws, *cws = &vc->vc_tty->winsize;
memset(&ws, 0, sizeof(ws));
ws.ws_row = vc->vc_rows;
ws.ws_col = vc->vc_cols;
ws.ws_ypixel = vc->vc_scan_lines;
if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
vc->vc_tty->pgrp > 0)
kill_pg(vc->vc_tty->pgrp, SIGWINCH, 1);
*cws = ws;
}
if (CON_IS_VISIBLE(vc))
update_screen(vc);
return err;
}
void vc_disallocate(unsigned int currcons)
{
WARN_CONSOLE_UNLOCKED();
if (vc_cons_allocated(currcons)) {
struct vc_data *vc = vc_cons[currcons].d;
vc->vc_sw->con_deinit(vc);
if (vc->vc_kmalloced)
kfree(vc->vc_screenbuf);
if (currcons >= MIN_NR_CONSOLES)
kfree(vc);
vc_cons[currcons].d = NULL;
}
}
/*
* VT102 emulator
*/
#define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
#define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
#define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
#define decarm VC_REPEAT
#define decckm VC_CKMODE
#define kbdapplic VC_APPLIC
#define lnm VC_CRLF
/*
* this is what the terminal answers to a ESC-Z or csi0c query.
*/
#define VT100ID "\033[?1;2c"
#define VT102ID "\033[?6c"
unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
8,12,10,14, 9,13,11,15 };
/* the default colour table, for VGA+ colour systems */
int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
/*
* gotoxy() must verify all boundaries, because the arguments
* might also be negative. If the given position is out of
* bounds, the cursor is placed at the nearest margin.
*/
static void gotoxy(struct vc_data *vc, int new_x, int new_y)
{
int min_y, max_y;
if (new_x < 0)
vc->vc_x = 0;
else {
if (new_x >= vc->vc_cols)
vc->vc_x = vc->vc_cols - 1;
else
vc->vc_x = new_x;
}
if (vc->vc_decom) {
min_y = vc->vc_top;
max_y = vc->vc_bottom;
} else {
min_y = 0;
max_y = vc->vc_rows;
}
if (new_y < min_y)
vc->vc_y = min_y;
else if (new_y >= max_y)
vc->vc_y = max_y - 1;
else
vc->vc_y = new_y;
vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
vc->vc_need_wrap = 0;
}
/* for absolute user moves, when decom is set */
static void gotoxay(struct vc_data *vc, int new_x, int new_y)
{
gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
}
void scrollback(struct vc_data *vc, int lines)
{
if (!lines)
lines = vc->vc_rows / 2;
scrolldelta(-lines);
}
void scrollfront(struct vc_data *vc, int lines)
{
if (!lines)
lines = vc->vc_rows / 2;
scrolldelta(lines);
}
static void lf(struct vc_data *vc)
{
/* don't scroll if above bottom of scrolling region, or
* if below scrolling region
*/
if (vc->vc_y + 1 == vc->vc_bottom)
scrup(vc, vc->vc_top, vc->vc_bottom, 1);
else if (vc->vc_y < vc->vc_rows - 1) {
vc->vc_y++;
vc->vc_pos += vc->vc_size_row;
}
vc->vc_need_wrap = 0;
}
static void ri(struct vc_data *vc)
{
/* don't scroll if below top of scrolling region, or
* if above scrolling region
*/
if (vc->vc_y == vc->vc_top)
scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
else if (vc->vc_y > 0) {
vc->vc_y--;
vc->vc_pos -= vc->vc_size_row;
}
vc->vc_need_wrap = 0;
}
static inline void cr(struct vc_data *vc)
{
vc->vc_pos -= vc->vc_x << 1;
vc->vc_need_wrap = vc->vc_x = 0;
}
static inline void bs(struct vc_data *vc)
{
if (vc->vc_x) {
vc->vc_pos -= 2;
vc->vc_x--;
vc->vc_need_wrap = 0;
}
}
static inline void del(struct vc_data *vc)
{
/* ignored */
}
static void csi_J(struct vc_data *vc, int vpar)
{
unsigned int count;
unsigned short * start;
switch (vpar) {
case 0: /* erase from cursor to end of display */
count = (vc->vc_scr_end - vc->vc_pos) >> 1;
start = (unsigned short *)vc->vc_pos;
if (DO_UPDATE(vc)) {
/* do in two stages */
vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
vc->vc_cols - vc->vc_x);
vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
vc->vc_rows - vc->vc_y - 1,
vc->vc_cols);
}
break;
case 1: /* erase from start to cursor */
count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
start = (unsigned short *)vc->vc_origin;
if (DO_UPDATE(vc)) {
/* do in two stages */
vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
vc->vc_cols);
vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
vc->vc_x + 1);
}
break;
case 2: /* erase whole display */
count = vc->vc_cols * vc->vc_rows;
start = (unsigned short *)vc->vc_origin;
if (DO_UPDATE(vc))
vc->vc_sw->con_clear(vc, 0, 0,
vc->vc_rows,
vc->vc_cols);
break;
default:
return;
}
scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
vc->vc_need_wrap = 0;
}
static void csi_K(struct vc_data *vc, int vpar)
{
unsigned int count;
unsigned short * start;
switch (vpar) {
case 0: /* erase from cursor to end of line */
count = vc->vc_cols - vc->vc_x;
start = (unsigned short *)vc->vc_pos;
if (DO_UPDATE(vc))
vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
vc->vc_cols - vc->vc_x);
break;
case 1: /* erase from start of line to cursor */
start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
count = vc->vc_x + 1;
if (DO_UPDATE(vc))
vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
vc->vc_x + 1);
break;
case 2: /* erase whole line */
start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
count = vc->vc_cols;
if (DO_UPDATE(vc))
vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
vc->vc_cols);
break;
default:
return;
}
scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
vc->vc_need_wrap = 0;
}
static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
{ /* not vt100? */
int count;
if (!vpar)
vpar++;
count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
if (DO_UPDATE(vc))
vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
vc->vc_need_wrap = 0;
}
static void default_attr(struct vc_data *vc)
{
vc->vc_intensity = 1;
vc->vc_underline = 0;
vc->vc_reverse = 0;
vc->vc_blink = 0;
vc->vc_color = vc->vc_def_color;
}
/* console_sem is held */
static void csi_m(struct vc_data *vc)
{
int i;
for (i = 0; i <= vc->vc_npar; i++)
switch (vc->vc_par[i]) {
case 0: /* all attributes off */
default_attr(vc);
break;
case 1:
vc->vc_intensity = 2;
break;
case 2:
vc->vc_intensity = 0;
break;
case 4:
vc->vc_underline = 1;
break;
case 5:
vc->vc_blink = 1;
break;
case 7:
vc->vc_reverse = 1;
break;
case 10: /* ANSI X3.64-1979 (SCO-ish?)
* Select primary font, don't display
* control chars if defined, don't set
* bit 8 on output.
*/
vc->vc_translate = set_translate(vc->vc_charset == 0
? vc->vc_G0_charset
: vc->vc_G1_charset, vc);
vc->vc_disp_ctrl = 0;
vc->vc_toggle_meta = 0;
break;
case 11: /* ANSI X3.64-1979 (SCO-ish?)
* Select first alternate font, lets
* chars < 32 be displayed as ROM chars.
*/
vc->vc_translate = set_translate(IBMPC_MAP, vc);
vc->vc_disp_ctrl = 1;
vc->vc_toggle_meta = 0;
break;
case 12: /* ANSI X3.64-1979 (SCO-ish?)
* Select second alternate font, toggle
* high bit before displaying as ROM char.
*/
vc->vc_translate = set_translate(IBMPC_MAP, vc);
vc->vc_disp_ctrl = 1;
vc->vc_toggle_meta = 1;
break;
case 21:
case 22:
vc->vc_intensity = 1;
break;
case 24:
vc->vc_underline = 0;
break;
case 25:
vc->vc_blink = 0;
break;
case 27:
vc->vc_reverse = 0;
break;
case 38: /* ANSI X3.64-1979 (SCO-ish?)
* Enables underscore, white foreground
* with white underscore (Linux - use
* default foreground).
*/
vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
vc->vc_underline = 1;
break;
case 39: /* ANSI X3.64-1979 (SCO-ish?)
* Disable underline option.
* Reset colour to default? It did this
* before...
*/
vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
vc->vc_underline = 0;
break;
case 49:
vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
break;
default:
if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
vc->vc_color = color_table[vc->vc_par[i] - 30]
| (vc->vc_color & 0xf0);
else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
| (vc->vc_color & 0x0f);
break;
}
update_attr(vc);
}
static void respond_string(const char *p, struct tty_struct *tty)
{
while (*p) {
tty_insert_flip_char(tty, *p, 0);
p++;
}
con_schedule_flip(tty);
}
static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
{
char buf[40];
sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
respond_string(buf, tty);
}
static inline void status_report(struct tty_struct *tty)
{
respond_string("\033[0n", tty); /* Terminal ok */
}
static inline void respond_ID(struct tty_struct * tty)
{
respond_string(VT102ID, tty);
}
void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
{
char buf[8];
sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
(char)('!' + mry));
respond_string(buf, tty);
}
/* invoked via ioctl(TIOCLINUX) and through set_selection */
int mouse_reporting(void)
{
return vc_cons[fg_console].d->vc_report_mouse;
}
/* console_sem is held */
static void set_mode(struct vc_data *vc, int on_off)
{
int i;
for (i = 0; i <= vc->vc_npar; i++)
if (vc->vc_ques) {
switch(vc->vc_par[i]) { /* DEC private modes set/reset */
case 1: /* Cursor keys send ^[Ox/^[[x */
if (on_off)
set_kbd(vc, decckm);
else
clr_kbd(vc, decckm);
break;
case 3: /* 80/132 mode switch unimplemented */
vc->vc_deccolm = on_off;
#if 0
vc_resize(deccolm ? 132 : 80, vc->vc_rows);
/* this alone does not suffice; some user mode
utility has to change the hardware regs */
#endif
break;
case 5: /* Inverted screen on/off */
if (vc->vc_decscnm != on_off) {
vc->vc_decscnm = on_off;
invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
update_attr(vc);
}
break;
case 6: /* Origin relative/absolute */
vc->vc_decom = on_off;
gotoxay(vc, 0, 0);
break;
case 7: /* Autowrap on/off */
vc->vc_decawm = on_off;
break;
case 8: /* Autorepeat on/off */
if (on_off)
set_kbd(vc, decarm);
else
clr_kbd(vc, decarm);
break;
case 9:
vc->vc_report_mouse = on_off ? 1 : 0;
break;
case 25: /* Cursor on/off */
vc->vc_deccm = on_off;
break;
case 1000:
vc->vc_report_mouse = on_off ? 2 : 0;
break;
}
} else {
switch(vc->vc_par[i]) { /* ANSI modes set/reset */
case 3: /* Monitor (display ctrls) */
vc->vc_disp_ctrl = on_off;
break;
case 4: /* Insert Mode on/off */
vc->vc_decim = on_off;
break;
case 20: /* Lf, Enter == CrLf/Lf */
if (on_off)
set_kbd(vc, lnm);
else
clr_kbd(vc, lnm);
break;
}
}
}
/* console_sem is held */
static void setterm_command(struct vc_data *vc)
{
switch(vc->vc_par[0]) {
case 1: /* set color for underline mode */
if (vc->vc_can_do_color &&
vc->vc_par[1] < 16) {
vc->vc_ulcolor = color_table[vc->vc_par[1]];
if (vc->vc_underline)
update_attr(vc);
}
break;
case 2: /* set color for half intensity mode */
if (vc->vc_can_do_color &&
vc->vc_par[1] < 16) {
vc->vc_halfcolor = color_table[vc->vc_par[1]];
if (vc->vc_intensity == 0)
update_attr(vc);
}
break;
case 8: /* store colors as defaults */
vc->vc_def_color = vc->vc_attr;
if (vc->vc_hi_font_mask == 0x100)
vc->vc_def_color >>= 1;
default_attr(vc);
update_attr(vc);
break;
case 9: /* set blanking interval */
blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
poke_blanked_console();
break;
case 10: /* set bell frequency in Hz */
if (vc->vc_npar >= 1)
vc->vc_bell_pitch = vc->vc_par[1];
else
vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
break;
case 11: /* set bell duration in msec */
if (vc->vc_npar >= 1)
vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
vc->vc_par[1] * HZ / 1000 : 0;
else
vc->vc_bell_duration = DEFAULT_BELL_DURATION;
break;
case 12: /* bring specified console to the front */
if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
set_console(vc->vc_par[1] - 1);
break;
case 13: /* unblank the screen */
poke_blanked_console();
break;
case 14: /* set vesa powerdown interval */
vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
break;
case 15: /* activate the previous console */
set_console(last_console);
break;
}
}
/* console_sem is held */
static void csi_at(struct vc_data *vc, unsigned int nr)
{
if (nr > vc->vc_cols - vc->vc_x)
nr = vc->vc_cols - vc->vc_x;
else if (!nr)
nr = 1;
insert_char(vc, nr);
}
/* console_sem is held */
static void csi_L(struct vc_data *vc, unsigned int nr)
{
if (nr > vc->vc_rows - vc->vc_y)
nr = vc->vc_rows - vc->vc_y;
else if (!nr)
nr = 1;
scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
vc->vc_need_wrap = 0;
}
/* console_sem is held */
static void csi_P(struct vc_data *vc, unsigned int nr)
{
if (nr > vc->vc_cols - vc->vc_x)
nr = vc->vc_cols - vc->vc_x;
else if (!nr)
nr = 1;
delete_char(vc, nr);
}
/* console_sem is held */
static void csi_M(struct vc_data *vc, unsigned int nr)
{
if (nr > vc->vc_rows - vc->vc_y)
nr = vc->vc_rows - vc->vc_y;
else if (!nr)
nr=1;
scrup(vc, vc->vc_y, vc->vc_bottom, nr);
vc->vc_need_wrap = 0;
}
/* console_sem is held (except via vc_init->reset_terminal */
static void save_cur(struct vc_data *vc)
{
vc->vc_saved_x = vc->vc_x;
vc->vc_saved_y = vc->vc_y;
vc->vc_s_intensity = vc->vc_intensity;
vc->vc_s_underline = vc->vc_underline;
vc->vc_s_blink = vc->vc_blink;
vc->vc_s_reverse = vc->vc_reverse;
vc->vc_s_charset = vc->vc_charset;
vc->vc_s_color = vc->vc_color;
vc->vc_saved_G0 = vc->vc_G0_charset;
vc->vc_saved_G1 = vc->vc_G1_charset;
}
/* console_sem is held */
static void restore_cur(struct vc_data *vc)
{
gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
vc->vc_intensity = vc->vc_s_intensity;
vc->vc_underline = vc->vc_s_underline;
vc->vc_blink = vc->vc_s_blink;
vc->vc_reverse = vc->vc_s_reverse;
vc->vc_charset = vc->vc_s_charset;
vc->vc_color = vc->vc_s_color;
vc->vc_G0_charset = vc->vc_saved_G0;
vc->vc_G1_charset = vc->vc_saved_G1;
vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
update_attr(vc);
vc->vc_need_wrap = 0;
}
enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
ESpalette };
/* console_sem is held (except via vc_init()) */
static void reset_terminal(struct vc_data *vc, int do_clear)
{
vc->vc_top = 0;
vc->vc_bottom = vc->vc_rows;
vc->vc_state = ESnormal;
vc->vc_ques = 0;
vc->vc_translate = set_translate(LAT1_MAP, vc);
vc->vc_G0_charset = LAT1_MAP;
vc->vc_G1_charset = GRAF_MAP;
vc->vc_charset = 0;
vc->vc_need_wrap = 0;
vc->vc_report_mouse = 0;
vc->vc_utf = 0;
vc->vc_utf_count = 0;
vc->vc_disp_ctrl = 0;
vc->vc_toggle_meta = 0;
vc->vc_decscnm = 0;
vc->vc_decom = 0;
vc->vc_decawm = 1;
vc->vc_deccm = 1;
vc->vc_decim = 0;
set_kbd(vc, decarm);
clr_kbd(vc, decckm);
clr_kbd(vc, kbdapplic);
clr_kbd(vc, lnm);
kbd_table[vc->vc_num].lockstate = 0;
kbd_table[vc->vc_num].slockstate = 0;
kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
/* do not do set_leds here because this causes an endless tasklet loop
when the keyboard hasn't been initialized yet */
vc->vc_cursor_type = CUR_DEFAULT;
vc->vc_complement_mask = vc->vc_s_complement_mask;
default_attr(vc);
update_attr(vc);
vc->vc_tab_stop[0] = 0x01010100;
vc->vc_tab_stop[1] =
vc->vc_tab_stop[2] =
vc->vc_tab_stop[3] =
vc->vc_tab_stop[4] = 0x01010101;
vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
vc->vc_bell_duration = DEFAULT_BELL_DURATION;
gotoxy(vc, 0, 0);
save_cur(vc);
if (do_clear)
csi_J(vc, 2);
}
/* console_sem is held */
static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
{
/*
* Control characters can be used in the _middle_
* of an escape sequence.
*/
switch (c) {
case 0:
return;
case 7:
if (vc->vc_bell_duration)
kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
return;
case 8:
bs(vc);
return;
case 9:
vc->vc_pos -= (vc->vc_x << 1);
while (vc->vc_x < vc->vc_cols - 1) {
vc->vc_x++;
if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
break;
}
vc->vc_pos += (vc->vc_x << 1);
return;
case 10: case 11: case 12:
lf(vc);
if (!is_kbd(vc, lnm))
return;
case 13:
cr(vc);
return;
case 14:
vc->vc_charset = 1;
vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
vc->vc_disp_ctrl = 1;
return;
case 15:
vc->vc_charset = 0;
vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
vc->vc_disp_ctrl = 0;
return;
case 24: case 26:
vc->vc_state = ESnormal;
return;
case 27:
vc->vc_state = ESesc;
return;
case 127:
del(vc);
return;
case 128+27:
vc->vc_state = ESsquare;
return;
}
switch(vc->vc_state) {
case ESesc:
vc->vc_state = ESnormal;
switch (c) {
case '[':
vc->vc_state = ESsquare;
return;
case ']':
vc->vc_state = ESnonstd;
return;
case '%':
vc->vc_state = ESpercent;
return;
case 'E':
cr(vc);
lf(vc);
return;
case 'M':
ri(vc);
return;
case 'D':
lf(vc);
return;
case 'H':
vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
return;
case 'Z':
respond_ID(tty);
return;
case '7':
save_cur(vc);
return;
case '8':
restore_cur(vc);
return;
case '(':
vc->vc_state = ESsetG0;
return;
case ')':
vc->vc_state = ESsetG1;
return;
case '#':
vc->vc_state = EShash;
return;
case 'c':
reset_terminal(vc, 1);
return;
case '>': /* Numeric keypad */
clr_kbd(vc, kbdapplic);
return;
case '=': /* Appl. keypad */
set_kbd(vc, kbdapplic);
return;
}
return;
case ESnonstd:
if (c=='P') { /* palette escape sequence */
for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
vc->vc_par[vc->vc_npar] = 0;
vc->vc_npar = 0;
vc->vc_state = ESpalette;
return;
} else if (c=='R') { /* reset palette */
reset_palette(vc);
vc->vc_state = ESnormal;
} else
vc->vc_state = ESnormal;
return;
case ESpalette:
if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
if (vc->vc_npar == 7) {
int i = vc->vc_par[0] * 3, j = 1;
vc->vc_palette[i] = 16 * vc->vc_par[j++];
vc->vc_palette[i++] += vc->vc_par[j++];
vc->vc_palette[i] = 16 * vc->vc_par[j++];
vc->vc_palette[i++] += vc->vc_par[j++];
vc->vc_palette[i] = 16 * vc->vc_par[j++];
vc->vc_palette[i] += vc->vc_par[j];
set_palette(vc);
vc->vc_state = ESnormal;
}
} else
vc->vc_state = ESnormal;
return;
case ESsquare:
for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
vc->vc_par[vc->vc_npar] = 0;
vc->vc_npar = 0;
vc->vc_state = ESgetpars;
if (c == '[') { /* Function key */
vc->vc_state=ESfunckey;
return;
}
vc->vc_ques = (c == '?');
if (vc->vc_ques)
return;
case ESgetpars:
if (c == ';' && vc->vc_npar < NPAR - 1) {
vc->vc_npar++;
return;
} else if (c>='0' && c<='9') {
vc->vc_par[vc->vc_npar] *= 10;
vc->vc_par[vc->vc_npar] += c - '0';
return;
} else
vc->vc_state = ESgotpars;
case ESgotpars:
vc->vc_state = ESnormal;
switch(c) {
case 'h':
set_mode(vc, 1);
return;
case 'l':
set_mode(vc, 0);
return;
case 'c':
if (vc->vc_ques) {
if (vc->vc_par[0])
vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
else
vc->vc_cursor_type = CUR_DEFAULT;
return;
}
break;
case 'm':
if (vc->vc_ques) {
clear_selection();
if (vc->vc_par[0])
vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
else
vc->vc_complement_mask = vc->vc_s_complement_mask;
return;
}
break;
case 'n':
if (!vc->vc_ques) {
if (vc->vc_par[0] == 5)
status_report(tty);
else if (vc->vc_par[0] == 6)
cursor_report(vc, tty);
}
return;
}
if (vc->vc_ques) {
vc->vc_ques = 0;
return;
}
switch(c) {
case 'G': case '`':
if (vc->vc_par[0])
vc->vc_par[0]--;
gotoxy(vc, vc->vc_par[0], vc->vc_y);
return;
case 'A':
if (!vc->vc_par[0])
vc->vc_par[0]++;
gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
return;
case 'B': case 'e':
if (!vc->vc_par[0])
vc->vc_par[0]++;
gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
return;
case 'C': case 'a':
if (!vc->vc_par[0])
vc->vc_par[0]++;
gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
return;
case 'D':
if (!vc->vc_par[0])
vc->vc_par[0]++;
gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
return;
case 'E':
if (!vc->vc_par[0])
vc->vc_par[0]++;
gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
return;
case 'F':
if (!vc->vc_par[0])
vc->vc_par[0]++;
gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
return;
case 'd':
if (vc->vc_par[0])
vc->vc_par[0]--;
gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
return;
case 'H': case 'f':
if (vc->vc_par[0])
vc->vc_par[0]--;
if (vc->vc_par[1])
vc->vc_par[1]--;
gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
return;
case 'J':
csi_J(vc, vc->vc_par[0]);
return;
case 'K':
csi_K(vc, vc->vc_par[0]);
return;
case 'L':
csi_L(vc, vc->vc_par[0]);
return;
case 'M':
csi_M(vc, vc->vc_par[0]);
return;
case 'P':
csi_P(vc, vc->vc_par[0]);
return;
case 'c':
if (!vc->vc_par[0])
respond_ID(tty);
return;
case 'g':
if (!vc->vc_par[0])
vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
else if (vc->vc_par[0] == 3) {
vc->vc_tab_stop[0] =
vc->vc_tab_stop[1] =
vc->vc_tab_stop[2] =
vc->vc_tab_stop[3] =
vc->vc_tab_stop[4] = 0;
}
return;
case 'm':
csi_m(vc);
return;
case 'q': /* DECLL - but only 3 leds */
/* map 0,1,2,3 to 0,1,2,4 */
if (vc->vc_par[0] < 4)
setledstate(kbd_table + vc->vc_num,
(vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
return;
case 'r':
if (!vc->vc_par[0])
vc->vc_par[0]++;
if (!vc->vc_par[1])
vc->vc_par[1] = vc->vc_rows;
/* Minimum allowed region is 2 lines */
if (vc->vc_par[0] < vc->vc_par[1] &&
vc->vc_par[1] <= vc->vc_rows) {
vc->vc_top = vc->vc_par[0] - 1;
vc->vc_bottom = vc->vc_par[1];
gotoxay(vc, 0, 0);
}
return;
case 's':
save_cur(vc);
return;
case 'u':
restore_cur(vc);
return;
case 'X':
csi_X(vc, vc->vc_par[0]);
return;
case '@':
csi_at(vc, vc->vc_par[0]);
return;
case ']': /* setterm functions */
setterm_command(vc);
return;
}
return;
case ESpercent:
vc->vc_state = ESnormal;
switch (c) {
case '@': /* defined in ISO 2022 */
vc->vc_utf = 0;
return;
case 'G': /* prelim official escape code */
case '8': /* retained for compatibility */
vc->vc_utf = 1;
return;
}
return;
case ESfunckey:
vc->vc_state = ESnormal;
return;
case EShash:
vc->vc_state = ESnormal;
if (c == '8') {
/* DEC screen alignment test. kludge :-) */
vc->vc_video_erase_char =
(vc->vc_video_erase_char & 0xff00) | 'E';
csi_J(vc, 2);
vc->vc_video_erase_char =
(vc->vc_video_erase_char & 0xff00) | ' ';
do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
}
return;
case ESsetG0:
if (c == '0')
vc->vc_G0_charset = GRAF_MAP;
else if (c == 'B')
vc->vc_G0_charset = LAT1_MAP;
else if (c == 'U')
vc->vc_G0_charset = IBMPC_MAP;
else if (c == 'K')
vc->vc_G0_charset = USER_MAP;
if (vc->vc_charset == 0)
vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
vc->vc_state = ESnormal;
return;
case ESsetG1:
if (c == '0')
vc->vc_G1_charset = GRAF_MAP;
else if (c == 'B')
vc->vc_G1_charset = LAT1_MAP;
else if (c == 'U')
vc->vc_G1_charset = IBMPC_MAP;
else if (c == 'K')
vc->vc_G1_charset = USER_MAP;
if (vc->vc_charset == 1)
vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
vc->vc_state = ESnormal;
return;
default:
vc->vc_state = ESnormal;
}
}
/* This is a temporary buffer used to prepare a tty console write
* so that we can easily avoid touching user space while holding the
* console spinlock. It is allocated in con_init and is shared by
* this code and the vc_screen read/write tty calls.
*
* We have to allocate this statically in the kernel data section
* since console_init (and thus con_init) are called before any
* kernel memory allocation is available.
*/
char con_buf[CON_BUF_SIZE];
DECLARE_MUTEX(con_buf_sem);
/* acquires console_sem */
static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
#ifdef VT_BUF_VRAM_ONLY
#define FLUSH do { } while(0);
#else
#define FLUSH if (draw_x >= 0) { \
vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
draw_x = -1; \
}
#endif
int c, tc, ok, n = 0, draw_x = -1;
unsigned int currcons;
unsigned long draw_from = 0, draw_to = 0;
struct vc_data *vc;
u16 himask, charmask;
const unsigned char *orig_buf = NULL;
int orig_count;
if (in_interrupt())
return count;
might_sleep();
acquire_console_sem();
vc = tty->driver_data;
if (vc == NULL) {
printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
release_console_sem();
return 0;
}
currcons = vc->vc_num;
if (!vc_cons_allocated(currcons)) {
/* could this happen? */
static int error = 0;
if (!error) {
error = 1;
printk("con_write: tty %d not allocated\n", currcons+1);
}
release_console_sem();
return 0;
}
release_console_sem();
orig_buf = buf;
orig_count = count;
/* At this point 'buf' is guaranteed to be a kernel buffer
* and therefore no access to userspace (and therefore sleeping)
* will be needed. The con_buf_sem serializes all tty based
* console rendering and vcs write/read operations. We hold
* the console spinlock during the entire write.
*/
acquire_console_sem();
vc = tty->driver_data;
if (vc == NULL) {
printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
release_console_sem();
goto out;
}
himask = vc->vc_hi_font_mask;
charmask = himask ? 0x1ff : 0xff;
/* undraw cursor first */
if (IS_FG(vc))
hide_cursor(vc);
while (!tty->stopped && count) {
int orig = *buf;
c = orig;
buf++;
n++;
count--;
/* Do no translation at all in control states */
if (vc->vc_state != ESnormal) {
tc = c;
} else if (vc->vc_utf) {
/* Combine UTF-8 into Unicode */
/* Incomplete characters silently ignored */
if(c > 0x7f) {
if (vc->vc_utf_count > 0 && (c & 0xc0) == 0x80) {
vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
vc->vc_utf_count--;
if (vc->vc_utf_count == 0)
tc = c = vc->vc_utf_char;
else continue;
} else {
if ((c & 0xe0) == 0xc0) {
vc->vc_utf_count = 1;
vc->vc_utf_char = (c & 0x1f);
} else if ((c & 0xf0) == 0xe0) {
vc->vc_utf_count = 2;
vc->vc_utf_char = (c & 0x0f);
} else if ((c & 0xf8) == 0xf0) {
vc->vc_utf_count = 3;
vc->vc_utf_char = (c & 0x07);
} else if ((c & 0xfc) == 0xf8) {
vc->vc_utf_count = 4;
vc->vc_utf_char = (c & 0x03);
} else if ((c & 0xfe) == 0xfc) {
vc->vc_utf_count = 5;
vc->vc_utf_char = (c & 0x01);
} else
vc->vc_utf_count = 0;
continue;
}
} else {
tc = c;
vc->vc_utf_count = 0;
}
} else { /* no utf */
tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
}
/* If the original code was a control character we
* only allow a glyph to be displayed if the code is
* not normally used (such as for cursor movement) or
* if the disp_ctrl mode has been explicitly enabled.
* Certain characters (as given by the CTRL_ALWAYS
* bitmap) are always displayed as control characters,
* as the console would be pretty useless without
* them; to display an arbitrary font position use the
* direct-to-font zone in UTF-8 mode.
*/
ok = tc && (c >= 32 ||
(!vc->vc_utf && !(((vc->vc_disp_ctrl ? CTRL_ALWAYS
: CTRL_ACTION) >> c) & 1)))
&& (c != 127 || vc->vc_disp_ctrl)
&& (c != 128+27);
if (vc->vc_state == ESnormal && ok) {
/* Now try to find out how to display it */
tc = conv_uni_to_pc(vc, tc);
if ( tc == -4 ) {
/* If we got -4 (not found) then see if we have
defined a replacement character (U+FFFD) */
tc = conv_uni_to_pc(vc, 0xfffd);
/* One reason for the -4 can be that we just
did a clear_unimap();
try at least to show something. */
if (tc == -4)
tc = c;
} else if ( tc == -3 ) {
/* Bad hash table -- hope for the best */
tc = c;
}
if (tc & ~charmask)
continue; /* Conversion failed */
if (vc->vc_need_wrap || vc->vc_decim)
FLUSH
if (vc->vc_need_wrap) {
cr(vc);
lf(vc);
}
if (vc->vc_decim)
insert_char(vc, 1);
scr_writew(himask ?
((vc->vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
(vc->vc_attr << 8) + tc,
(u16 *) vc->vc_pos);
if (DO_UPDATE(vc) && draw_x < 0) {
draw_x = vc->vc_x;
draw_from = vc->vc_pos;
}
if (vc->vc_x == vc->vc_cols - 1) {
vc->vc_need_wrap = vc->vc_decawm;
draw_to = vc->vc_pos + 2;
} else {
vc->vc_x++;
draw_to = (vc->vc_pos += 2);
}
continue;
}
FLUSH
do_con_trol(tty, vc, orig);
}
FLUSH
console_conditional_schedule();
release_console_sem();
out:
return n;
#undef FLUSH
}
/*
* This is the console switching callback.
*
* Doing console switching in a process context allows
* us to do the switches asynchronously (needed when we want
* to switch due to a keyboard interrupt). Synchronization
* with other console code and prevention of re-entrancy is
* ensured with console_sem.
*/
static void console_callback(void *ignored)
{
acquire_console_sem();
if (want_console >= 0) {
if (want_console != fg_console &&
vc_cons_allocated(want_console)) {
hide_cursor(vc_cons[fg_console].d);
change_console(vc_cons[want_console].d);
/* we only changed when the console had already
been allocated - a new console is not created
in an interrupt routine */
}
want_console = -1;
}
if (do_poke_blanked_console) { /* do not unblank for a LED change */
do_poke_blanked_console = 0;
poke_blanked_console();
}
if (scrollback_delta) {
struct vc_data *vc = vc_cons[fg_console].d;
clear_selection();
if (vc->vc_mode == KD_TEXT)
vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
scrollback_delta = 0;
}
if (blank_timer_expired) {
do_blank_screen(0);
blank_timer_expired = 0;
}
release_console_sem();
}
void set_console(int nr)
{
want_console = nr;
schedule_console_callback();
}
struct tty_driver *console_driver;
#ifdef CONFIG_VT_CONSOLE
/*
* Console on virtual terminal
*
* The console must be locked when we get here.
*/
static void vt_console_print(struct console *co, const char *b, unsigned count)
{
struct vc_data *vc = vc_cons[fg_console].d;
unsigned char c;
static unsigned long printing;
const ushort *start;
ushort cnt = 0;
ushort myx;
/* console busy or not yet initialized */
if (!printable || test_and_set_bit(0, &printing))
return;
if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
vc = vc_cons[kmsg_redirect - 1].d;
/* read `x' only after setting currcons properly (otherwise
the `x' macro will read the x of the foreground console). */
myx = vc->vc_x;
if (!vc_cons_allocated(fg_console)) {
/* impossible */
/* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
goto quit;
}
if (vc->vc_mode != KD_TEXT)
goto quit;
/* undraw cursor first */
if (IS_FG(vc))
hide_cursor(vc);
start = (ushort *)vc->vc_pos;
/* Contrived structure to try to emulate original need_wrap behaviour
* Problems caused when we have need_wrap set on '\n' character */
while (count--) {
c = *b++;
if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
if (cnt > 0) {
if (CON_IS_VISIBLE(vc))
vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
vc->vc_x += cnt;
if (vc->vc_need_wrap)
vc->vc_x--;
cnt = 0;
}
if (c == 8) { /* backspace */
bs(vc);
start = (ushort *)vc->vc_pos;
myx = vc->vc_x;
continue;
}
if (c != 13)
lf(vc);
cr(vc);
start = (ushort *)vc->vc_pos;
myx = vc->vc_x;
if (c == 10 || c == 13)
continue;
}
scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
cnt++;
if (myx == vc->vc_cols - 1) {
vc->vc_need_wrap = 1;
continue;
}
vc->vc_pos += 2;
myx++;
}
if (cnt > 0) {
if (CON_IS_VISIBLE(vc))
vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
vc->vc_x += cnt;
if (vc->vc_x == vc->vc_cols) {
vc->vc_x--;
vc->vc_need_wrap = 1;
}
}
set_cursor(vc);
quit:
clear_bit(0, &printing);
}
static struct tty_driver *vt_console_device(struct console *c, int *index)
{
*index = c->index ? c->index-1 : fg_console;
return console_driver;
}
static struct console vt_console_driver = {
.name = "tty",
.write = vt_console_print,
.device = vt_console_device,
.unblank = unblank_screen,
.flags = CON_PRINTBUFFER,
.index = -1,
};
#endif
/*
* Handling of Linux-specific VC ioctls
*/
/*
* Generally a bit racy with respect to console_sem().
*
* There are some functions which don't need it.
*
* There are some functions which can sleep for arbitrary periods
* (paste_selection) but we don't need the lock there anyway.
*
* set_selection has locking, and definitely needs it
*/
int tioclinux(struct tty_struct *tty, unsigned long arg)
{
char type, data;
char __user *p = (char __user *)arg;
int lines;
int ret;
if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
return -EINVAL;
if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
return -EPERM;
if (get_user(type, p))
return -EFAULT;
ret = 0;
switch (type)
{
case TIOCL_SETSEL:
acquire_console_sem();
ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
release_console_sem();
break;
case TIOCL_PASTESEL:
ret = paste_selection(tty);
break;
case TIOCL_UNBLANKSCREEN:
acquire_console_sem();
unblank_screen();
release_console_sem();
break;
case TIOCL_SELLOADLUT:
ret = sel_loadlut(p);
break;
case TIOCL_GETSHIFTSTATE:
/*
* Make it possible to react to Shift+Mousebutton.
* Note that 'shift_state' is an undocumented
* kernel-internal variable; programs not closely
* related to the kernel should not use this.
*/
data = shift_state;
ret = __put_user(data, p);
break;
case TIOCL_GETMOUSEREPORTING:
data = mouse_reporting();
ret = __put_user(data, p);
break;
case TIOCL_SETVESABLANK:
set_vesa_blanking(p);
break;
case TIOCL_SETKMSGREDIRECT:
if (!capable(CAP_SYS_ADMIN)) {
ret = -EPERM;
} else {
if (get_user(data, p+1))
ret = -EFAULT;
else
kmsg_redirect = data;
}
break;
case TIOCL_GETFGCONSOLE:
ret = fg_console;
break;
case TIOCL_SCROLLCONSOLE:
if (get_user(lines, (s32 __user *)(p+4))) {
ret = -EFAULT;
} else {
scrollfront(vc_cons[fg_console].d, lines);
ret = 0;
}
break;
case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
acquire_console_sem();
ignore_poke = 1;
do_blank_screen(0);
release_console_sem();
break;
case TIOCL_BLANKEDSCREEN:
ret = console_blanked;
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
/*
* /dev/ttyN handling
*/
static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
int retval;
retval = do_con_write(tty, buf, count);
con_flush_chars(tty);
return retval;
}
static void con_put_char(struct tty_struct *tty, unsigned char ch)
{
if (in_interrupt())
return; /* n_r3964 calls put_char() from interrupt context */
do_con_write(tty, &ch, 1);
}
static int con_write_room(struct tty_struct *tty)
{
if (tty->stopped)
return 0;
return 4096; /* No limit, really; we're not buffering */
}
static int con_chars_in_buffer(struct tty_struct *tty)
{
return 0; /* we're not buffering */
}
/*
* con_throttle and con_unthrottle are only used for
* paste_selection(), which has to stuff in a large number of
* characters...
*/
static void con_throttle(struct tty_struct *tty)
{
}
static void con_unthrottle(struct tty_struct *tty)
{
struct vc_data *vc = tty->driver_data;
wake_up_interruptible(&vc->paste_wait);
}
/*
* Turn the Scroll-Lock LED on when the tty is stopped
*/
static void con_stop(struct tty_struct *tty)
{
int console_num;
if (!tty)
return;
console_num = tty->index;
if (!vc_cons_allocated(console_num))
return;
set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
set_leds();
}
/*
* Turn the Scroll-Lock LED off when the console is started
*/
static void con_start(struct tty_struct *tty)
{
int console_num;
if (!tty)
return;
console_num = tty->index;
if (!vc_cons_allocated(console_num))
return;
clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
set_leds();
}
static void con_flush_chars(struct tty_struct *tty)
{
struct vc_data *vc;
if (in_interrupt()) /* from flush_to_ldisc */
return;
/* if we race with con_close(), vt may be null */
acquire_console_sem();
vc = tty->driver_data;
if (vc)
set_cursor(vc);
release_console_sem();
}
/*
* Allocate the console screen memory.
*/
static int con_open(struct tty_struct *tty, struct file *filp)
{
unsigned int currcons = tty->index;
int ret = 0;
acquire_console_sem();
if (tty->driver_data == NULL) {
ret = vc_allocate(currcons);
if (ret == 0) {
struct vc_data *vc = vc_cons[currcons].d;
tty->driver_data = vc;
vc->vc_tty = tty;
if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
}
release_console_sem();
vcs_make_devfs(tty);
return ret;
}
}
release_console_sem();
return ret;
}
/*
* We take tty_sem in here to prevent another thread from coming in via init_dev
* and taking a ref against the tty while we're in the process of forgetting
* about it and cleaning things up.
*
* This is because vcs_remove_devfs() can sleep and will drop the BKL.
*/
static void con_close(struct tty_struct *tty, struct file *filp)
{
down(&tty_sem);
acquire_console_sem();
if (tty && tty->count == 1) {
struct vc_data *vc = tty->driver_data;
if (vc)
vc->vc_tty = NULL;
tty->driver_data = NULL;
release_console_sem();
vcs_remove_devfs(tty);
up(&tty_sem);
/*
* tty_sem is released, but we still hold BKL, so there is
* still exclusion against init_dev()
*/
return;
}
release_console_sem();
up(&tty_sem);
}
static void vc_init(struct vc_data *vc, unsigned int rows,
unsigned int cols, int do_clear)
{
int j, k ;
vc->vc_cols = cols;
vc->vc_rows = rows;
vc->vc_size_row = cols << 1;
vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
set_origin(vc);
vc->vc_pos = vc->vc_origin;
reset_vc(vc);
for (j=k=0; j<16; j++) {
vc->vc_palette[k++] = default_red[j] ;
vc->vc_palette[k++] = default_grn[j] ;
vc->vc_palette[k++] = default_blu[j] ;
}
vc->vc_def_color = 0x07; /* white */
vc->vc_ulcolor = 0x0f; /* bold white */
vc->vc_halfcolor = 0x08; /* grey */
init_waitqueue_head(&vc->paste_wait);
reset_terminal(vc, do_clear);
}
/*
* This routine initializes console interrupts, and does nothing
* else. If you want the screen to clear, call tty_write with
* the appropriate escape-sequence.
*/
static int __init con_init(void)
{
const char *display_desc = NULL;
struct vc_data *vc;
unsigned int currcons = 0;
acquire_console_sem();
if (conswitchp)
display_desc = conswitchp->con_startup();
if (!display_desc) {
fg_console = 0;
release_console_sem();
return 0;
}
init_timer(&console_timer);
console_timer.function = blank_screen_t;
if (blankinterval) {
blank_state = blank_normal_wait;
mod_timer(&console_timer, jiffies + blankinterval);
}
/*
* kmalloc is not running yet - we use the bootmem allocator.
*/
for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
visual_init(vc, currcons, 1);
vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
vc->vc_kmalloced = 0;
vc_init(vc, vc->vc_rows, vc->vc_cols,
currcons || !vc->vc_sw->con_save_screen);
}
currcons = fg_console = 0;
master_display_fg = vc = vc_cons[currcons].d;
set_origin(vc);
save_screen(vc);
gotoxy(vc, vc->vc_x, vc->vc_y);
csi_J(vc, 0);
update_screen(vc);
printk("Console: %s %s %dx%d",
vc->vc_can_do_color ? "colour" : "mono",
display_desc, vc->vc_cols, vc->vc_rows);
printable = 1;
printk("\n");
release_console_sem();
#ifdef CONFIG_VT_CONSOLE
register_console(&vt_console_driver);
#endif
return 0;
}
console_initcall(con_init);
static struct tty_operations con_ops = {
.open = con_open,
.close = con_close,
.write = con_write,
.write_room = con_write_room,
.put_char = con_put_char,
.flush_chars = con_flush_chars,
.chars_in_buffer = con_chars_in_buffer,
.ioctl = vt_ioctl,
.stop = con_stop,
.start = con_start,
.throttle = con_throttle,
.unthrottle = con_unthrottle,
};
int __init vty_init(void)
{
vcs_init();
console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
if (!console_driver)
panic("Couldn't allocate console driver\n");
console_driver->owner = THIS_MODULE;
console_driver->devfs_name = "vc/";
console_driver->name = "tty";
console_driver->name_base = 1;
console_driver->major = TTY_MAJOR;
console_driver->minor_start = 1;
console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
console_driver->init_termios = tty_std_termios;
console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
tty_set_operations(console_driver, &con_ops);
if (tty_register_driver(console_driver))
panic("Couldn't register console driver\n");
kbd_init();
console_map_init();
#ifdef CONFIG_PROM_CONSOLE
prom_con_init();
#endif
#ifdef CONFIG_MDA_CONSOLE
mda_console_init();
#endif
return 0;
}
#ifndef VT_SINGLE_DRIVER
/*
* If we support more console drivers, this function is used
* when a driver wants to take over some existing consoles
* and become default driver for newly opened ones.
*/
int take_over_console(const struct consw *csw, int first, int last, int deflt)
{
int i, j = -1;
const char *desc;
struct module *owner;
owner = csw->owner;
if (!try_module_get(owner))
return -ENODEV;
acquire_console_sem();
desc = csw->con_startup();
if (!desc) {
release_console_sem();
module_put(owner);
return -ENODEV;
}
if (deflt) {
if (conswitchp)
module_put(conswitchp->owner);
__module_get(owner);
conswitchp = csw;
}
for (i = first; i <= last; i++) {
int old_was_color;
struct vc_data *vc = vc_cons[i].d;
if (con_driver_map[i])
module_put(con_driver_map[i]->owner);
__module_get(owner);
con_driver_map[i] = csw;
if (!vc || !vc->vc_sw)
continue;
j = i;
if (CON_IS_VISIBLE(vc))
save_screen(vc);
old_was_color = vc->vc_can_do_color;
vc->vc_sw->con_deinit(vc);
vc->vc_origin = (unsigned long)vc->vc_screenbuf;
vc->vc_visible_origin = vc->vc_origin;
vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
visual_init(vc, i, 0);
update_attr(vc);
/* If the console changed between mono <-> color, then
* the attributes in the screenbuf will be wrong. The
* following resets all attributes to something sane.
*/
if (old_was_color != vc->vc_can_do_color)
clear_buffer_attributes(vc);
if (CON_IS_VISIBLE(vc))
update_screen(vc);
}
printk("Console: switching ");
if (!deflt)
printk("consoles %d-%d ", first+1, last+1);
if (j >= 0)
printk("to %s %s %dx%d\n",
vc_cons[j].d->vc_can_do_color ? "colour" : "mono",
desc, vc_cons[j].d->vc_cols, vc_cons[j].d->vc_rows);
else
printk("to %s\n", desc);
release_console_sem();
module_put(owner);
return 0;
}
void give_up_console(const struct consw *csw)
{
int i;
for(i = 0; i < MAX_NR_CONSOLES; i++)
if (con_driver_map[i] == csw) {
module_put(csw->owner);
con_driver_map[i] = NULL;
}
}
#endif
/*
* Screen blanking
*/
static void set_vesa_blanking(char __user *p)
{
unsigned int mode;
get_user(mode, p + 1);
vesa_blank_mode = (mode < 4) ? mode : 0;
}
/*
* This is called by a timer handler
*/
static void vesa_powerdown(void)
{
struct vc_data *c = vc_cons[fg_console].d;
/*
* Power down if currently suspended (1 or 2),
* suspend if currently blanked (0),
* else do nothing (i.e. already powered down (3)).
* Called only if powerdown features are allowed.
*/
switch (vesa_blank_mode) {
case VESA_NO_BLANKING:
c->vc_sw->con_blank(c, VESA_VSYNC_SUSPEND+1, 0);
break;
case VESA_VSYNC_SUSPEND:
case VESA_HSYNC_SUSPEND:
c->vc_sw->con_blank(c, VESA_POWERDOWN+1, 0);
break;
}
}
void do_blank_screen(int entering_gfx)
{
struct vc_data *vc = vc_cons[fg_console].d;
int i;
WARN_CONSOLE_UNLOCKED();
if (console_blanked) {
if (blank_state == blank_vesa_wait) {
blank_state = blank_off;
vesa_powerdown();
}
return;
}
if (blank_state != blank_normal_wait)
return;
blank_state = blank_off;
/* entering graphics mode? */
if (entering_gfx) {
hide_cursor(vc);
save_screen(vc);
vc->vc_sw->con_blank(vc, -1, 1);
console_blanked = fg_console + 1;
set_origin(vc);
return;
}
/* don't blank graphics */
if (vc->vc_mode != KD_TEXT) {
console_blanked = fg_console + 1;
return;
}
hide_cursor(vc);
del_timer_sync(&console_timer);
blank_timer_expired = 0;
save_screen(vc);
/* In case we need to reset origin, blanking hook returns 1 */
i = vc->vc_sw->con_blank(vc, 1, 0);
console_blanked = fg_console + 1;
if (i)
set_origin(vc);
if (console_blank_hook && console_blank_hook(1))
return;
if (vesa_off_interval) {
blank_state = blank_vesa_wait;
mod_timer(&console_timer, jiffies + vesa_off_interval);
}
if (vesa_blank_mode)
vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
}
EXPORT_SYMBOL(do_blank_screen);
/*
* Called by timer as well as from vt_console_driver
*/
void do_unblank_screen(int leaving_gfx)
{
struct vc_data *vc;
/* This should now always be called from a "sane" (read: can schedule)
* context for the sake of the low level drivers, except in the special
* case of oops_in_progress
*/
if (!oops_in_progress)
might_sleep();
WARN_CONSOLE_UNLOCKED();
ignore_poke = 0;
if (!console_blanked)
return;
if (!vc_cons_allocated(fg_console)) {
/* impossible */
printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
return;
}
vc = vc_cons[fg_console].d;
if (vc->vc_mode != KD_TEXT)
return; /* but leave console_blanked != 0 */
if (blankinterval) {
mod_timer(&console_timer, jiffies + blankinterval);
blank_state = blank_normal_wait;
}
console_blanked = 0;
if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
/* Low-level driver cannot restore -> do it ourselves */
update_screen(vc);
if (console_blank_hook)
console_blank_hook(0);
set_palette(vc);
set_cursor(vc);
}
EXPORT_SYMBOL(do_unblank_screen);
/*
* This is called by the outside world to cause a forced unblank, mostly for
* oopses. Currently, I just call do_unblank_screen(0), but we could eventually
* call it with 1 as an argument and so force a mode restore... that may kill
* X or at least garbage the screen but would also make the Oops visible...
*/
void unblank_screen(void)
{
do_unblank_screen(0);
}
/*
* We defer the timer blanking to work queue so it can take the console semaphore
* (console operations can still happen at irq time, but only from printk which
* has the console semaphore. Not perfect yet, but better than no locking
*/
static void blank_screen_t(unsigned long dummy)
{
if (unlikely(!keventd_up())) {
mod_timer(&console_timer, jiffies + blankinterval);
return;
}
blank_timer_expired = 1;
schedule_work(&console_work);
}
void poke_blanked_console(void)
{
WARN_CONSOLE_UNLOCKED();
/* Add this so we quickly catch whoever might call us in a non
* safe context. Nowadays, unblank_screen() isn't to be called in
* atomic contexts and is allowed to schedule (with the special case
* of oops_in_progress, but that isn't of any concern for this
* function. --BenH.
*/
might_sleep();
/* This isn't perfectly race free, but a race here would be mostly harmless,
* at worse, we'll do a spurrious blank and it's unlikely
*/
del_timer(&console_timer);
blank_timer_expired = 0;
if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
return;
if (console_blanked)
unblank_screen();
else if (blankinterval) {
mod_timer(&console_timer, jiffies + blankinterval);
blank_state = blank_normal_wait;
}
}
/*
* Palettes
*/
static void set_palette(struct vc_data *vc)
{
WARN_CONSOLE_UNLOCKED();
if (vc->vc_mode != KD_GRAPHICS)
vc->vc_sw->con_set_palette(vc, color_table);
}
static int set_get_cmap(unsigned char __user *arg, int set)
{
int i, j, k;
WARN_CONSOLE_UNLOCKED();
for (i = 0; i < 16; i++)
if (set) {
get_user(default_red[i], arg++);
get_user(default_grn[i], arg++);
get_user(default_blu[i], arg++);
} else {
put_user(default_red[i], arg++);
put_user(default_grn[i], arg++);
put_user(default_blu[i], arg++);
}
if (set) {
for (i = 0; i < MAX_NR_CONSOLES; i++)
if (vc_cons_allocated(i)) {
for (j = k = 0; j < 16; j++) {
vc_cons[i].d->vc_palette[k++] = default_red[j];
vc_cons[i].d->vc_palette[k++] = default_grn[j];
vc_cons[i].d->vc_palette[k++] = default_blu[j];
}
set_palette(vc_cons[i].d);
}
}
return 0;
}
/*
* Load palette into the DAC registers. arg points to a colour
* map, 3 bytes per colour, 16 colours, range from 0 to 255.
*/
int con_set_cmap(unsigned char __user *arg)
{
int rc;
acquire_console_sem();
rc = set_get_cmap (arg,1);
release_console_sem();
return rc;
}
int con_get_cmap(unsigned char __user *arg)
{
int rc;
acquire_console_sem();
rc = set_get_cmap (arg,0);
release_console_sem();
return rc;
}
void reset_palette(struct vc_data *vc)
{
int j, k;
for (j=k=0; j<16; j++) {
vc->vc_palette[k++] = default_red[j];
vc->vc_palette[k++] = default_grn[j];
vc->vc_palette[k++] = default_blu[j];
}
set_palette(vc);
}
/*
* Font switching
*
* Currently we only support fonts up to 32 pixels wide, at a maximum height
* of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
* depending on width) reserved for each character which is kinda wasty, but
* this is done in order to maintain compatibility with the EGA/VGA fonts. It
* is upto the actual low-level console-driver convert data into its favorite
* format (maybe we should add a `fontoffset' field to the `display'
* structure so we won't have to convert the fontdata all the time.
* /Jes
*/
#define max_font_size 65536
static int con_font_get(struct vc_data *vc, struct console_font_op *op)
{
struct console_font font;
int rc = -EINVAL;
int c;
if (vc->vc_mode != KD_TEXT)
return -EINVAL;
if (op->data) {
font.data = kmalloc(max_font_size, GFP_KERNEL);
if (!font.data)
return -ENOMEM;
} else
font.data = NULL;
acquire_console_sem();
if (vc->vc_sw->con_font_get)
rc = vc->vc_sw->con_font_get(vc, &font);
else
rc = -ENOSYS;
release_console_sem();
if (rc)
goto out;
c = (font.width+7)/8 * 32 * font.charcount;
if (op->data && font.charcount > op->charcount)
rc = -ENOSPC;
if (!(op->flags & KD_FONT_FLAG_OLD)) {
if (font.width > op->width || font.height > op->height)
rc = -ENOSPC;
} else {
if (font.width != 8)
rc = -EIO;
else if ((op->height && font.height > op->height) ||
font.height > 32)
rc = -ENOSPC;
}
if (rc)
goto out;
op->height = font.height;
op->width = font.width;
op->charcount = font.charcount;
if (op->data && copy_to_user(op->data, font.data, c))
rc = -EFAULT;
out:
kfree(font.data);
return rc;
}
static int con_font_set(struct vc_data *vc, struct console_font_op *op)
{
struct console_font font;
int rc = -EINVAL;
int size;
if (vc->vc_mode != KD_TEXT)
return -EINVAL;
if (!op->data)
return -EINVAL;
if (op->charcount > 512)
return -EINVAL;
if (!op->height) { /* Need to guess font height [compat] */
int h, i;
u8 __user *charmap = op->data;
u8 tmp;
/* If from KDFONTOP ioctl, don't allow things which can be done in userland,
so that we can get rid of this soon */
if (!(op->flags & KD_FONT_FLAG_OLD))
return -EINVAL;
for (h = 32; h > 0; h--)
for (i = 0; i < op->charcount; i++) {
if (get_user(tmp, &charmap[32*i+h-1]))
return -EFAULT;
if (tmp)
goto nonzero;
}
return -EINVAL;
nonzero:
op->height = h;
}
if (op->width <= 0 || op->width > 32 || op->height > 32)
return -EINVAL;
size = (op->width+7)/8 * 32 * op->charcount;
if (size > max_font_size)
return -ENOSPC;
font.charcount = op->charcount;
font.height = op->height;
font.width = op->width;
font.data = kmalloc(size, GFP_KERNEL);
if (!font.data)
return -ENOMEM;
if (copy_from_user(font.data, op->data, size)) {
kfree(font.data);
return -EFAULT;
}
acquire_console_sem();
if (vc->vc_sw->con_font_set)
rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
else
rc = -ENOSYS;
release_console_sem();
kfree(font.data);
return rc;
}
static int con_font_default(struct vc_data *vc, struct console_font_op *op)
{
struct console_font font = {.width = op->width, .height = op->height};
char name[MAX_FONT_NAME];
char *s = name;
int rc;
if (vc->vc_mode != KD_TEXT)
return -EINVAL;
if (!op->data)
s = NULL;
else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
return -EFAULT;
else
name[MAX_FONT_NAME - 1] = 0;
acquire_console_sem();
if (vc->vc_sw->con_font_default)
rc = vc->vc_sw->con_font_default(vc, &font, s);
else
rc = -ENOSYS;
release_console_sem();
if (!rc) {
op->width = font.width;
op->height = font.height;
}
return rc;
}
static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
{
int con = op->height;
int rc;
if (vc->vc_mode != KD_TEXT)
return -EINVAL;
acquire_console_sem();
if (!vc->vc_sw->con_font_copy)
rc = -ENOSYS;
else if (con < 0 || !vc_cons_allocated(con))
rc = -ENOTTY;
else if (con == vc->vc_num) /* nothing to do */
rc = 0;
else
rc = vc->vc_sw->con_font_copy(vc, con);
release_console_sem();
return rc;
}
int con_font_op(struct vc_data *vc, struct console_font_op *op)
{
switch (op->op) {
case KD_FONT_OP_SET:
return con_font_set(vc, op);
case KD_FONT_OP_GET:
return con_font_get(vc, op);
case KD_FONT_OP_SET_DEFAULT:
return con_font_default(vc, op);
case KD_FONT_OP_COPY:
return con_font_copy(vc, op);
}
return -ENOSYS;
}
/*
* Interface exported to selection and vcs.
*/
/* used by selection */
u16 screen_glyph(struct vc_data *vc, int offset)
{
u16 w = scr_readw(screenpos(vc, offset, 1));
u16 c = w & 0xff;
if (w & vc->vc_hi_font_mask)
c |= 0x100;
return c;
}
/* used by vcs - note the word offset */
unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
{
return screenpos(vc, 2 * w_offset, viewed);
}
void getconsxy(struct vc_data *vc, unsigned char *p)
{
p[0] = vc->vc_x;
p[1] = vc->vc_y;
}
void putconsxy(struct vc_data *vc, unsigned char *p)
{
gotoxy(vc, p[0], p[1]);
set_cursor(vc);
}
u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
{
if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
return softcursor_original;
return scr_readw(org);
}
void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
{
scr_writew(val, org);
if ((unsigned long)org == vc->vc_pos) {
softcursor_original = -1;
add_softcursor(vc);
}
}
/*
* Visible symbols for modules
*/
EXPORT_SYMBOL(color_table);
EXPORT_SYMBOL(default_red);
EXPORT_SYMBOL(default_grn);
EXPORT_SYMBOL(default_blu);
EXPORT_SYMBOL(update_region);
EXPORT_SYMBOL(redraw_screen);
EXPORT_SYMBOL(vc_resize);
EXPORT_SYMBOL(fg_console);
EXPORT_SYMBOL(console_blank_hook);
EXPORT_SYMBOL(console_blanked);
EXPORT_SYMBOL(vc_cons);
#ifndef VT_SINGLE_DRIVER
EXPORT_SYMBOL(take_over_console);
EXPORT_SYMBOL(give_up_console);
#endif
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