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LeafOS / LeafOS-Devices / android_kernel_realme_mt6785 / 3b23782f7d004f3d7fa655623ebca3137b442656 / . / drivers / tty / vt / vt.c
blob: 9c9945284bcf240d319b98f986c2573b4d16e307 [file] [log] [blame]
/*
* 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
*
* Removed console_lock, enabled interrupts across all console operations
* 13 March 2001, Andrew Morton
*
* Fixed UTF-8 mode so alternate charset modes always work according
* to control sequences interpreted in do_con_trol function
* preserving backward VT100 semigraphics compatibility,
* malformed UTF sequences represented as sequences of replacement glyphs,
* original codes or '?' as a last resort if replacement glyph is undefined
* by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/sched/signal.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/mutex.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/workqueue.h>
#include <linux/pm.h>
#include <linux/font.h>
#include <linux/bitops.h>
#include <linux/notifier.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/uaccess.h>
#include <linux/kdb.h>
#include <linux/ctype.h>
#define MAX_NR_CON_DRIVER 16
#define CON_DRIVER_FLAG_MODULE 1
#define CON_DRIVER_FLAG_INIT 2
#define CON_DRIVER_FLAG_ATTR 4
#define CON_DRIVER_FLAG_ZOMBIE 8
struct con_driver {
const struct consw *con;
const char *desc;
struct device *dev;
int node;
int first;
int last;
int flag;
};
static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
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)
#define DEFAULT_CURSOR_BLINK_MS 200
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 int 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(struct work_struct *ignored);
static void con_driver_unregister_callback(struct work_struct *ignored);
static void blank_screen_t(unsigned long dummy);
static void set_palette(struct vc_data *vc);
#define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
static int printable; /* Is console ready for printing? */
int default_utf8 = true;
module_param(default_utf8, int, S_IRUGO | S_IWUSR);
int global_cursor_default = -1;
module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
static int cur_default = CUR_DEFAULT;
module_param(cur_default, int, S_IRUGO | S_IWUSR);
/*
* 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 vesa_off_interval;
static int blankinterval;
core_param(consoleblank, blankinterval, int, 0444);
static DECLARE_WORK(console_work, console_callback);
static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
/*
* fg_console is the current virtual console,
* last_console is the last used one,
* want_console is the console we want to switch to,
* saved_* variants are for save/restore around kernel debugger enter/leave
*/
int fg_console;
int last_console;
int want_console = -1;
static int saved_fg_console;
static int saved_last_console;
static int saved_want_console;
static int saved_vc_mode;
static int saved_console_blanked;
/*
* 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 DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
static int blank_state;
static int blank_timer_expired;
enum {
blank_off = 0,
blank_normal_wait,
blank_vesa_wait,
};
/*
* /sys/class/tty/tty0/
*
* the attribute 'active' contains the name of the current vc
* console and it supports poll() to detect vc switches
*/
static struct device *tty0dev;
/*
* Notifier list for console events.
*/
static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
int register_vt_notifier(struct notifier_block *nb)
{
return atomic_notifier_chain_register(&vt_notifier_list, nb);
}
EXPORT_SYMBOL_GPL(register_vt_notifier);
int unregister_vt_notifier(struct notifier_block *nb)
{
return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
}
EXPORT_SYMBOL_GPL(unregister_vt_notifier);
static void notify_write(struct vc_data *vc, unsigned int unicode)
{
struct vt_notifier_param param = { .vc = vc, .c = unicode };
atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
}
static void notify_update(struct vc_data *vc)
{
struct vt_notifier_param param = { .vc = vc };
atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
}
/*
* Low-Level Functions
*/
static inline bool con_is_fg(const struct vc_data *vc)
{
return vc->vc_num == fg_console;
}
static inline bool con_should_update(const struct vc_data *vc)
{
return con_is_visible(vc) && !console_blanked;
}
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;
}
/* Called from the keyboard irq path.. */
static inline void scrolldelta(int lines)
{
/* FIXME */
/* scrolldelta needs some kind of consistency lock, but the BKL was
and still is not protecting versus the scheduled back end */
scrollback_delta += lines;
schedule_console_callback();
}
void schedule_console_callback(void)
{
schedule_work(&console_work);
}
static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
enum con_scroll dir, unsigned int nr)
{
u16 *clear, *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, dir, nr))
return;
s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
if (dir == SM_UP) {
clear = s + (b - t - nr) * vc->vc_cols;
swap(s, d);
}
scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
}
static void do_update_region(struct vc_data *vc, unsigned long start, int count)
{
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);
}
}
}
void update_region(struct vc_data *vc, unsigned long start, int count)
{
WARN_CONSOLE_UNLOCKED();
if (con_should_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, u8 _italic)
{
if (vc->vc_sw->con_build_attr)
return vc->vc_sw->con_build_attr(vc, _color, _intensity,
_blink, _underline, _reverse, _italic);
/*
* ++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 = _color;
if (!vc->vc_can_do_color)
return _intensity |
(_italic ? 2 : 0) |
(_underline ? 4 : 0) |
(_reverse ? 8 : 0) |
(_blink ? 0x80 : 0);
if (_italic)
a = (a & 0xF0) | vc->vc_itcolor;
else 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;
}
}
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_italic);
vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 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);
} 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++;
}
}
}
if (con_should_update(vc))
do_update_region(vc, (unsigned long) p, count);
notify_update(vc);
}
/* 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 (con_should_update(vc))
vc->vc_sw->con_putc(vc, old, oldy, oldx);
notify_update(vc);
}
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 (con_should_update(vc)) {
oldx = (offset >> 1) % vc->vc_cols;
oldy = (offset >> 1) / vc->vc_cols;
vc->vc_sw->con_putc(vc, new, oldy, oldx);
}
notify_update(vc);
}
}
static void insert_char(struct vc_data *vc, unsigned int nr)
{
unsigned short *p = (unsigned short *) vc->vc_pos;
scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
vc->vc_need_wrap = 0;
if (con_should_update(vc))
do_update_region(vc, (unsigned long) p,
vc->vc_cols - vc->vc_x);
}
static void delete_char(struct vc_data *vc, unsigned int nr)
{
unsigned short *p = (unsigned short *) vc->vc_pos;
scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
nr * 2);
vc->vc_need_wrap = 0;
if (con_should_update(vc))
do_update_region(vc, (unsigned long) p,
vc->vc_cols - vc->vc_x);
}
static int softcursor_original = -1;
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 (con_should_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 (con_should_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 (!con_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 void save_screen(struct vc_data *vc)
{
WARN_CONSOLE_UNLOCKED();
if (vc->vc_sw->con_save_screen)
vc->vc_sw->con_save_screen(vc);
}
static void flush_scrollback(struct vc_data *vc)
{
WARN_CONSOLE_UNLOCKED();
if (vc->vc_sw->con_flush_scrollback)
vc->vc_sw->con_flush_scrollback(vc);
}
/*
* Redrawing of screen
*/
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);
}
if (tty0dev)
sysfs_notify(&tty0dev->kobj, NULL, "active");
} 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);
}
/* Forcibly update if we're panicing */
if ((update && vc->vc_mode != KD_GRAPHICS) ||
vt_force_oops_output(vc))
do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
}
set_cursor(vc);
if (is_switch) {
set_leds();
compute_shiftstate();
notify_update(vc);
}
}
/*
* 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;
if (vc->vc_uni_pagedir_loc)
con_free_unimap(vc);
vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
vc->vc_uni_pagedir = NULL;
vc->vc_hi_font_mask = 0;
vc->vc_complement_mask = 0;
vc->vc_can_do_color = 0;
vc->vc_panic_force_write = false;
vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
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 */
{
struct vt_notifier_param param;
struct vc_data *vc;
WARN_CONSOLE_UNLOCKED();
if (currcons >= MAX_NR_CONSOLES)
return -ENXIO;
if (vc_cons[currcons].d)
return 0;
/* 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 */
param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
if (!vc)
return -ENOMEM;
vc_cons[currcons].d = vc;
tty_port_init(&vc->port);
INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
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)
goto err_free;
/* If no drivers have overridden us and the user didn't pass a
boot option, default to displaying the cursor */
if (global_cursor_default == -1)
global_cursor_default = 1;
vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
vcs_make_sysfs(currcons);
atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
return 0;
err_free:
kfree(vc);
vc_cons[currcons].d = NULL;
return -ENOMEM;
}
static inline int resize_screen(struct vc_data *vc, int width, int height,
int user)
{
/* 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, user);
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)
/**
* vc_do_resize - resizing method for the tty
* @tty: tty being resized
* @real_tty: real tty (different to tty if a pty/tty pair)
* @vc: virtual console private data
* @cols: columns
* @lines: lines
*
* Resize a virtual console, clipping according to the actual constraints.
* If the caller passes a tty structure then update the termios winsize
* information and perform any necessary signal handling.
*
* Caller must hold the console semaphore. Takes the termios rwsem and
* ctrl_lock of the tty IFF a tty is passed.
*/
static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
unsigned int cols, unsigned int lines)
{
unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
unsigned long end;
unsigned int old_rows, old_row_size;
unsigned int new_cols, new_rows, new_row_size, new_screen_size;
unsigned int user;
unsigned short *newscreen;
WARN_CONSOLE_UNLOCKED();
if (!vc)
return -ENXIO;
user = vc->vc_resize_user;
vc->vc_resize_user = 0;
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;
if (new_screen_size > (4 << 20))
return -EINVAL;
newscreen = kmalloc(new_screen_size, GFP_USER);
if (!newscreen)
return -ENOMEM;
if (vc == sel_cons)
clear_selection();
old_rows = vc->vc_rows;
old_row_size = vc->vc_size_row;
err = resize_screen(vc, new_cols, new_rows, user);
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;
} 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 + old_row_size * min(old_rows, new_rows);
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);
kfree(vc->vc_screenbuf);
vc->vc_screenbuf = newscreen;
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 (tty) {
/* Rewrite the requested winsize data with the actual
resulting sizes */
struct winsize ws;
memset(&ws, 0, sizeof(ws));
ws.ws_row = vc->vc_rows;
ws.ws_col = vc->vc_cols;
ws.ws_ypixel = vc->vc_scan_lines;
tty_do_resize(tty, &ws);
}
if (con_is_visible(vc))
update_screen(vc);
vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
return err;
}
/**
* vc_resize - resize a VT
* @vc: virtual console
* @cols: columns
* @rows: rows
*
* Resize a virtual console as seen from the console end of things. We
* use the common vc_do_resize methods to update the structures. The
* caller must hold the console sem to protect console internals and
* vc->port.tty
*/
int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
{
return vc_do_resize(vc->port.tty, vc, cols, rows);
}
/**
* vt_resize - resize a VT
* @tty: tty to resize
* @ws: winsize attributes
*
* Resize a virtual terminal. This is called by the tty layer as we
* register our own handler for resizing. The mutual helper does all
* the actual work.
*
* Takes the console sem and the called methods then take the tty
* termios_rwsem and the tty ctrl_lock in that order.
*/
static int vt_resize(struct tty_struct *tty, struct winsize *ws)
{
struct vc_data *vc = tty->driver_data;
int ret;
console_lock();
ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
console_unlock();
return ret;
}
struct vc_data *vc_deallocate(unsigned int currcons)
{
struct vc_data *vc = NULL;
WARN_CONSOLE_UNLOCKED();
if (vc_cons_allocated(currcons)) {
struct vt_notifier_param param;
param.vc = vc = vc_cons[currcons].d;
atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
vcs_remove_sysfs(currcons);
vc->vc_sw->con_deinit(vc);
put_pid(vc->vt_pid);
module_put(vc->vc_sw->owner);
kfree(vc->vc_screenbuf);
vc_cons[currcons].d = NULL;
}
return vc;
}
/*
* VT102 emulator
*/
#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
#define is_kbd(vc, x) vt_get_kbd_mode_bit((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"
const 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 */
unsigned char default_red[] = {
0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
};
module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
unsigned char default_grn[] = {
0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
};
module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
unsigned char default_blu[] = {
0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
};
module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
/*
* 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)
{
scrolldelta(-(vc->vc_rows / 2));
}
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)
con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 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;
notify_write(vc, '\n');
}
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)
con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 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;
notify_write(vc, '\r');
}
static inline void bs(struct vc_data *vc)
{
if (vc->vc_x) {
vc->vc_pos -= 2;
vc->vc_x--;
vc->vc_need_wrap = 0;
notify_write(vc, '\b');
}
}
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;
break;
case 1: /* erase from start to cursor */
count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
start = (unsigned short *)vc->vc_origin;
break;
case 3: /* erase scroll-back buffer (and whole display) */
scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
vc->vc_screenbuf_size);
flush_scrollback(vc);
set_origin(vc);
if (con_is_visible(vc))
update_screen(vc);
/* fall through */
case 2: /* erase whole display */
count = vc->vc_cols * vc->vc_rows;
start = (unsigned short *)vc->vc_origin;
break;
default:
return;
}
scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
if (con_should_update(vc))
do_update_region(vc, (unsigned long) start, 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;
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;
break;
case 2: /* erase whole line */
start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
count = vc->vc_cols;
break;
default:
return;
}
scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
vc->vc_need_wrap = 0;
if (con_should_update(vc))
do_update_region(vc, (unsigned long) start, count);
}
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 (con_should_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_italic = 0;
vc->vc_underline = 0;
vc->vc_reverse = 0;
vc->vc_blink = 0;
vc->vc_color = vc->vc_def_color;
}
struct rgb { u8 r; u8 g; u8 b; };
static void rgb_from_256(int i, struct rgb *c)
{
if (i < 8) { /* Standard colours. */
c->r = i&1 ? 0xaa : 0x00;
c->g = i&2 ? 0xaa : 0x00;
c->b = i&4 ? 0xaa : 0x00;
} else if (i < 16) {
c->r = i&1 ? 0xff : 0x55;
c->g = i&2 ? 0xff : 0x55;
c->b = i&4 ? 0xff : 0x55;
} else if (i < 232) { /* 6x6x6 colour cube. */
c->r = (i - 16) / 36 * 85 / 2;
c->g = (i - 16) / 6 % 6 * 85 / 2;
c->b = (i - 16) % 6 * 85 / 2;
} else /* Grayscale ramp. */
c->r = c->g = c->b = i * 10 - 2312;
}
static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
{
u8 hue = 0, max = max3(c->r, c->g, c->b);
if (c->r > max / 2)
hue |= 4;
if (c->g > max / 2)
hue |= 2;
if (c->b > max / 2)
hue |= 1;
if (hue == 7 && max <= 0x55) {
hue = 0;
vc->vc_intensity = 2;
} else if (max > 0xaa)
vc->vc_intensity = 2;
else
vc->vc_intensity = 1;
vc->vc_color = (vc->vc_color & 0xf0) | hue;
}
static void rgb_background(struct vc_data *vc, const struct rgb *c)
{
/* For backgrounds, err on the dark side. */
vc->vc_color = (vc->vc_color & 0x0f)
| (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
}
/*
* ITU T.416 Higher colour modes. They break the usual properties of SGR codes
* and thus need to be detected and ignored by hand. Strictly speaking, that
* standard also wants : rather than ; as separators, contrary to ECMA-48, but
* no one produces such codes and almost no one accepts them.
*
* Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
* supporting them.
*/
static int vc_t416_color(struct vc_data *vc, int i,
void(*set_color)(struct vc_data *vc, const struct rgb *c))
{
struct rgb c;
i++;
if (i > vc->vc_npar)
return i;
if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
/* 256 colours */
i++;
rgb_from_256(vc->vc_par[i], &c);
} else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
/* 24 bit */
c.r = vc->vc_par[i + 1];
c.g = vc->vc_par[i + 2];
c.b = vc->vc_par[i + 3];
i += 3;
} else
return i;
set_color(vc, &c);
return i;
}
/* console_lock 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 3:
vc->vc_italic = 1;
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 23:
vc->vc_italic = 0;
break;
case 24:
vc->vc_underline = 0;
break;
case 25:
vc->vc_blink = 0;
break;
case 27:
vc->vc_reverse = 0;
break;
case 38:
i = vc_t416_color(vc, i, rgb_foreground);
break;
case 48:
i = vc_t416_color(vc, i, rgb_background);
break;
case 39:
vc->vc_color = (vc->vc_def_color & 0x0f) |
(vc->vc_color & 0xf0);
break;
case 49:
vc->vc_color = (vc->vc_def_color & 0xf0) |
(vc->vc_color & 0x0f);
break;
default:
if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
if (vc->vc_par[i] < 100)
vc->vc_intensity = 2;
vc->vc_par[i] -= 60;
}
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_port *port)
{
while (*p) {
tty_insert_flip_char(port, *p, 0);
p++;
}
tty_schedule_flip(port);
}
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->port);
}
static inline void status_report(struct tty_struct *tty)
{
respond_string("\033[0n", tty->port); /* Terminal ok */
}
static inline void respond_ID(struct tty_struct *tty)
{
respond_string(VT102ID, tty->port);
}
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->port);
}
/* invoked via ioctl(TIOCLINUX) and through set_selection */
int mouse_reporting(void)
{
return vc_cons[fg_console].d->vc_report_mouse;
}
/* console_lock 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 */
#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_lock 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;
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) ?
msecs_to_jiffies(vc->vc_par[1]) : 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;
case 16: /* set cursor blink duration in msec */
if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
vc->vc_par[1] <= USHRT_MAX)
vc->vc_cur_blink_ms = vc->vc_par[1];
else
vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
break;
}
}
/* console_lock 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_lock 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;
con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr);
vc->vc_need_wrap = 0;
}
/* console_lock 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_lock 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;
con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_UP, nr);
vc->vc_need_wrap = 0;
}
/* console_lock 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_italic = vc->vc_italic;
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_lock 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_italic = vc->vc_s_italic;
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, ESfunckey,
EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
ESpalette, ESosc };
/* console_lock 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 = default_utf8;
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 = global_cursor_default;
vc->vc_decim = 0;
vt_reset_keyboard(vc->vc_num);
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] =
vc->vc_tab_stop[5] =
vc->vc_tab_stop[6] =
vc->vc_tab_stop[7] = 0x01010101;
vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
vc->vc_bell_duration = DEFAULT_BELL_DURATION;
vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
gotoxy(vc, 0, 0);
save_cur(vc);
if (do_clear)
csi_J(vc, 2);
}
/* console_lock 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.
*/
if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
return;
switch (c) {
case 0:
return;
case 7:
if (vc->vc_state == ESosc)
vc->vc_state = ESnormal;
else 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);
notify_write(vc, '\t');
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 if (c>='0' && c<='9')
vc->vc_state = ESosc;
else
vc->vc_state = ESnormal;
return;
case ESpalette:
if (isxdigit(c)) {
vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
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;
}
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] =
vc->vc_tab_stop[5] =
vc->vc_tab_stop[6] =
vc->vc_tab_stop[7] = 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)
vt_set_led_state(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;
case ESosc:
return;
default:
vc->vc_state = ESnormal;
}
}
/* is_double_width() is based on the wcwidth() implementation by
* Markus Kuhn -- 2007-05-26 (Unicode 5.0)
* Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
*/
struct interval {
uint32_t first;
uint32_t last;
};
static int bisearch(uint32_t ucs, const struct interval *table, int max)
{
int min = 0;
int mid;
if (ucs < table[0].first || ucs > table[max].last)
return 0;
while (max >= min) {
mid = (min + max) / 2;
if (ucs > table[mid].last)
min = mid + 1;
else if (ucs < table[mid].first)
max = mid - 1;
else
return 1;
}
return 0;
}
static int is_double_width(uint32_t ucs)
{
static const struct interval double_width[] = {
{ 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
{ 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
{ 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
{ 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
};
return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
}
static void con_flush(struct vc_data *vc, unsigned long draw_from,
unsigned long draw_to, int *draw_x)
{
if (*draw_x < 0)
return;
vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
(u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
*draw_x = -1;
}
/* acquires console_lock */
static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
int c, tc, ok, n = 0, draw_x = -1;
unsigned int currcons;
unsigned long draw_from = 0, draw_to = 0;
struct vc_data *vc;
unsigned char vc_attr;
struct vt_notifier_param param;
uint8_t rescan;
uint8_t inverse;
uint8_t width;
u16 himask, charmask;
if (in_interrupt())
return count;
might_sleep();
console_lock();
vc = tty->driver_data;
if (vc == NULL) {
printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
console_unlock();
return 0;
}
currcons = vc->vc_num;
if (!vc_cons_allocated(currcons)) {
/* could this happen? */
pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
console_unlock();
return 0;
}
himask = vc->vc_hi_font_mask;
charmask = himask ? 0x1ff : 0xff;
/* undraw cursor first */
if (con_is_fg(vc))
hide_cursor(vc);
param.vc = vc;
while (!tty->stopped && count) {
int orig = *buf;
c = orig;
buf++;
n++;
count--;
rescan = 0;
inverse = 0;
width = 1;
/* Do no translation at all in control states */
if (vc->vc_state != ESnormal) {
tc = c;
} else if (vc->vc_utf && !vc->vc_disp_ctrl) {
/* Combine UTF-8 into Unicode in vc_utf_char.
* vc_utf_count is the number of continuation bytes still
* expected to arrive.
* vc_npar is the number of continuation bytes arrived so
* far
*/
rescan_last_byte:
if ((c & 0xc0) == 0x80) {
/* Continuation byte received */
static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
if (vc->vc_utf_count) {
vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
vc->vc_npar++;
if (--vc->vc_utf_count) {
/* Still need some bytes */
continue;
}
/* Got a whole character */
c = vc->vc_utf_char;
/* Reject overlong sequences */
if (c <= utf8_length_changes[vc->vc_npar - 1] ||
c > utf8_length_changes[vc->vc_npar])
c = 0xfffd;
} else {
/* Unexpected continuation byte */
vc->vc_utf_count = 0;
c = 0xfffd;
}
} else {
/* Single ASCII byte or first byte of a sequence received */
if (vc->vc_utf_count) {
/* Continuation byte expected */
rescan = 1;
vc->vc_utf_count = 0;
c = 0xfffd;
} else if (c > 0x7f) {
/* First byte of a multibyte sequence received */
vc->vc_npar = 0;
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 {
/* 254 and 255 are invalid */
c = 0xfffd;
}
if (vc->vc_utf_count) {
/* Still need some bytes */
continue;
}
}
/* Nothing to do if an ASCII byte was received */
}
/* End of UTF-8 decoding. */
/* c is the received character, or U+FFFD for invalid sequences. */
/* Replace invalid Unicode code points with U+FFFD too */
if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
c = 0xfffd;
tc = c;
} else { /* no utf or alternate charset mode */
tc = vc_translate(vc, c);
}
param.c = tc;
if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
&param) == NOTIFY_STOP)
continue;
/* 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_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
&& (c != 127 || vc->vc_disp_ctrl)
&& (c != 128+27);
if (vc->vc_state == ESnormal && ok) {
if (vc->vc_utf && !vc->vc_disp_ctrl) {
if (is_double_width(c))
width = 2;
}
/* Now try to find out how to display it */
tc = conv_uni_to_pc(vc, tc);
if (tc & ~charmask) {
if (tc == -1 || tc == -2) {
continue; /* nothing to display */
}
/* Glyph not found */
if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
/* In legacy mode use the glyph we get by a 1:1 mapping.
This would make absolutely no sense with Unicode in mind,
but do this for ASCII characters since a font may lack
Unicode mapping info and we don't want to end up with
having question marks only. */
tc = c;
} else {
/* Display U+FFFD. If it's not found, display an inverse question mark. */
tc = conv_uni_to_pc(vc, 0xfffd);
if (tc < 0) {
inverse = 1;
tc = conv_uni_to_pc(vc, '?');
if (tc < 0) tc = '?';
}
}
}
if (!inverse) {
vc_attr = vc->vc_attr;
} else {
/* invert vc_attr */
if (!vc->vc_can_do_color) {
vc_attr = (vc->vc_attr) ^ 0x08;
} else if (vc->vc_hi_font_mask == 0x100) {
vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
} else {
vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
}
con_flush(vc, draw_from, draw_to, &draw_x);
}
while (1) {
if (vc->vc_need_wrap || vc->vc_decim)
con_flush(vc, draw_from, draw_to,
&draw_x);
if (vc->vc_need_wrap) {
cr(vc);
lf(vc);
}
if (vc->vc_decim)
insert_char(vc, 1);
scr_writew(himask ?
((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
(vc_attr << 8) + tc,
(u16 *) vc->vc_pos);
if (con_should_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);
}
if (!--width) break;
tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
if (tc < 0) tc = ' ';
}
notify_write(vc, c);
if (inverse)
con_flush(vc, draw_from, draw_to, &draw_x);
if (rescan) {
rescan = 0;
inverse = 0;
width = 1;
c = orig;
goto rescan_last_byte;
}
continue;
}
con_flush(vc, draw_from, draw_to, &draw_x);
do_con_trol(tty, vc, orig);
}
con_flush(vc, draw_from, draw_to, &draw_x);
console_conditional_schedule();
console_unlock();
notify_update(vc);
return n;
}
/*
* 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_lock.
*/
static void console_callback(struct work_struct *ignored)
{
console_lock();
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->vc_sw->con_scrolldelta(vc, scrollback_delta);
scrollback_delta = 0;
}
if (blank_timer_expired) {
do_blank_screen(0);
blank_timer_expired = 0;
}
notify_update(vc_cons[fg_console].d);
console_unlock();
}
int set_console(int nr)
{
struct vc_data *vc = vc_cons[fg_console].d;
if (!vc_cons_allocated(nr) || vt_dont_switch ||
(vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
/*
* Console switch will fail in console_callback() or
* change_console() so there is no point scheduling
* the callback
*
* Existing set_console() users don't check the return
* value so this shouldn't break anything
*/
return -EINVAL;
}
want_console = nr;
schedule_console_callback();
return 0;
}
struct tty_driver *console_driver;
#ifdef CONFIG_VT_CONSOLE
/**
* vt_kmsg_redirect() - Sets/gets the kernel message console
* @new: The new virtual terminal number or -1 if the console should stay
* unchanged
*
* By default, the kernel messages are always printed on the current virtual
* console. However, the user may modify that default with the
* TIOCL_SETKMSGREDIRECT ioctl call.
*
* This function sets the kernel message console to be @new. It returns the old
* virtual console number. The virtual terminal number 0 (both as parameter and
* return value) means no redirection (i.e. always printed on the currently
* active console).
*
* The parameter -1 means that only the current console is returned, but the
* value is not modified. You may use the macro vt_get_kmsg_redirect() in that
* case to make the code more understandable.
*
* When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
* the parameter and always returns 0.
*/
int vt_kmsg_redirect(int new)
{
static int kmsg_con;
if (new != -1)
return xchg(&kmsg_con, new);
else
return kmsg_con;
}
/*
* 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 DEFINE_SPINLOCK(printing_lock);
const ushort *start;
ushort cnt = 0;
ushort myx;
int kmsg_console;
/* console busy or not yet initialized */
if (!printable)
return;
if (!spin_trylock(&printing_lock))
return;
kmsg_console = vt_get_kmsg_redirect();
if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
vc = vc_cons[kmsg_console - 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 && !vt_force_oops_output(vc))
goto quit;
/* undraw cursor first */
if (con_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);
notify_write(vc, c);
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);
notify_update(vc);
quit:
spin_unlock(&printing_lock);
}
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_lock();.
*
* 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 (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
return -EPERM;
if (get_user(type, p))
return -EFAULT;
ret = 0;
switch (type)
{
case TIOCL_SETSEL:
console_lock();
ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
console_unlock();
break;
case TIOCL_PASTESEL:
ret = paste_selection(tty);
break;
case TIOCL_UNBLANKSCREEN:
console_lock();
unblank_screen();
console_unlock();
break;
case TIOCL_SELLOADLUT:
console_lock();
ret = sel_loadlut(p);
console_unlock();
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 = vt_get_shift_state();
ret = __put_user(data, p);
break;
case TIOCL_GETMOUSEREPORTING:
console_lock(); /* May be overkill */
data = mouse_reporting();
console_unlock();
ret = __put_user(data, p);
break;
case TIOCL_SETVESABLANK:
console_lock();
ret = set_vesa_blanking(p);
console_unlock();
break;
case TIOCL_GETKMSGREDIRECT:
data = vt_get_kmsg_redirect();
ret = __put_user(data, p);
break;
case TIOCL_SETKMSGREDIRECT:
if (!capable(CAP_SYS_ADMIN)) {
ret = -EPERM;
} else {
if (get_user(data, p+1))
ret = -EFAULT;
else
vt_kmsg_redirect(data);
}
break;
case TIOCL_GETFGCONSOLE:
/* No locking needed as this is a transiently
correct return anyway if the caller hasn't
disabled switching */
ret = fg_console;
break;
case TIOCL_SCROLLCONSOLE:
if (get_user(lines, (s32 __user *)(p+4))) {
ret = -EFAULT;
} else {
/* Need the console lock here. Note that lots
of other calls need fixing before the lock
is actually useful ! */
console_lock();
scrollfront(vc_cons[fg_console].d, lines);
console_unlock();
ret = 0;
}
break;
case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
console_lock();
ignore_poke = 1;
do_blank_screen(0);
console_unlock();
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 int con_put_char(struct tty_struct *tty, unsigned char ch)
{
if (in_interrupt())
return 0; /* n_r3964 calls put_char() from interrupt context */
return do_con_write(tty, &ch, 1);
}
static int con_write_room(struct tty_struct *tty)
{
if (tty->stopped)
return 0;
return 32768; /* 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;
vt_kbd_con_stop(console_num);
}
/*
* 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;
vt_kbd_con_start(console_num);
}
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 */
console_lock();
vc = tty->driver_data;
if (vc)
set_cursor(vc);
console_unlock();
}
/*
* Allocate the console screen memory.
*/
static int con_install(struct tty_driver *driver, struct tty_struct *tty)
{
unsigned int currcons = tty->index;
struct vc_data *vc;
int ret;
console_lock();
ret = vc_allocate(currcons);
if (ret)
goto unlock;
vc = vc_cons[currcons].d;
/* Still being freed */
if (vc->port.tty) {
ret = -ERESTARTSYS;
goto unlock;
}
ret = tty_port_install(&vc->port, driver, tty);
if (ret)
goto unlock;
tty->driver_data = vc;
vc->port.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;
}
if (vc->vc_utf)
tty->termios.c_iflag |= IUTF8;
else
tty->termios.c_iflag &= ~IUTF8;
unlock:
console_unlock();
return ret;
}
static int con_open(struct tty_struct *tty, struct file *filp)
{
/* everything done in install */
return 0;
}
static void con_close(struct tty_struct *tty, struct file *filp)
{
/* Nothing to do - we defer to shutdown */
}
static void con_shutdown(struct tty_struct *tty)
{
struct vc_data *vc = tty->driver_data;
BUG_ON(vc == NULL);
console_lock();
vc->port.tty = NULL;
console_unlock();
}
static int default_color = 7; /* white */
static int default_italic_color = 2; // green (ASCII)
static int default_underline_color = 3; // cyan (ASCII)
module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
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 = default_color;
vc->vc_ulcolor = default_underline_color;
vc->vc_itcolor = default_italic_color;
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, i;
console_lock();
if (conswitchp)
display_desc = conswitchp->con_startup();
if (!display_desc) {
fg_console = 0;
console_unlock();
return 0;
}
for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
struct con_driver *con_driver = &registered_con_driver[i];
if (con_driver->con == NULL) {
con_driver->con = conswitchp;
con_driver->desc = display_desc;
con_driver->flag = CON_DRIVER_FLAG_INIT;
con_driver->first = 0;
con_driver->last = MAX_NR_CONSOLES - 1;
break;
}
}
for (i = 0; i < MAX_NR_CONSOLES; i++)
con_driver_map[i] = conswitchp;
if (blankinterval) {
blank_state = blank_normal_wait;
mod_timer(&console_timer, jiffies + (blankinterval * HZ));
}
for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
tty_port_init(&vc->port);
visual_init(vc, currcons, 1);
vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
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);
pr_info("Console: %s %s %dx%d\n",
vc->vc_can_do_color ? "colour" : "mono",
display_desc, vc->vc_cols, vc->vc_rows);
printable = 1;
console_unlock();
#ifdef CONFIG_VT_CONSOLE
register_console(&vt_console_driver);
#endif
return 0;
}
console_initcall(con_init);
static const struct tty_operations con_ops = {
.install = con_install,
.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,
#ifdef CONFIG_COMPAT
.compat_ioctl = vt_compat_ioctl,
#endif
.stop = con_stop,
.start = con_start,
.throttle = con_throttle,
.unthrottle = con_unthrottle,
.resize = vt_resize,
.shutdown = con_shutdown
};
static struct cdev vc0_cdev;
static ssize_t show_tty_active(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "tty%d\n", fg_console + 1);
}
static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
static struct attribute *vt_dev_attrs[] = {
&dev_attr_active.attr,
NULL
};
ATTRIBUTE_GROUPS(vt_dev);
int __init vty_init(const struct file_operations *console_fops)
{
cdev_init(&vc0_cdev, console_fops);
if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
panic("Couldn't register /dev/tty0 driver\n");
tty0dev = device_create_with_groups(tty_class, NULL,
MKDEV(TTY_MAJOR, 0), NULL,
vt_dev_groups, "tty0");
if (IS_ERR(tty0dev))
tty0dev = NULL;
vcs_init();
console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
if (!console_driver)
panic("Couldn't allocate console driver\n");
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;
if (default_utf8)
console_driver->init_termios.c_iflag |= IUTF8;
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_MDA_CONSOLE
mda_console_init();
#endif
return 0;
}
#ifndef VT_SINGLE_DRIVER
static struct class *vtconsole_class;
static int do_bind_con_driver(const struct consw *csw, int first, int last,
int deflt)
{
struct module *owner = csw->owner;
const char *desc = NULL;
struct con_driver *con_driver;
int i, j = -1, k = -1, retval = -ENODEV;
if (!try_module_get(owner))
return -ENODEV;
WARN_CONSOLE_UNLOCKED();
/* check if driver is registered */
for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
con_driver = &registered_con_driver[i];
if (con_driver->con == csw) {
desc = con_driver->desc;
retval = 0;
break;
}
}
if (retval)
goto err;
if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
csw->con_startup();
con_driver->flag |= CON_DRIVER_FLAG_INIT;
}
if (deflt) {
if (conswitchp)
module_put(conswitchp->owner);
__module_get(owner);
conswitchp = csw;
}
first = max(first, con_driver->first);
last = min(last, con_driver->last);
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)) {
k = i;
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;
visual_init(vc, i, 0);
set_origin(vc);
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);
}
pr_info("Console: switching ");
if (!deflt)
printk(KERN_CONT "consoles %d-%d ", first+1, last+1);
if (j >= 0) {
struct vc_data *vc = vc_cons[j].d;
printk(KERN_CONT "to %s %s %dx%d\n",
vc->vc_can_do_color ? "colour" : "mono",
desc, vc->vc_cols, vc->vc_rows);
if (k >= 0) {
vc = vc_cons[k].d;
update_screen(vc);
}
} else
printk(KERN_CONT "to %s\n", desc);
retval = 0;
err:
module_put(owner);
return retval;
};
#ifdef CONFIG_VT_HW_CONSOLE_BINDING
/* unlocked version of unbind_con_driver() */
int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
{
struct module *owner = csw->owner;
const struct consw *defcsw = NULL;
struct con_driver *con_driver = NULL, *con_back = NULL;
int i, retval = -ENODEV;
if (!try_module_get(owner))
return -ENODEV;
WARN_CONSOLE_UNLOCKED();
/* check if driver is registered and if it is unbindable */
for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
con_driver = &registered_con_driver[i];
if (con_driver->con == csw &&
con_driver->flag & CON_DRIVER_FLAG_MODULE) {
retval = 0;
break;
}
}
if (retval)
goto err;
retval = -ENODEV;
/* check if backup driver exists */
for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
con_back = &registered_con_driver[i];
if (con_back->con && con_back->con != csw) {
defcsw = con_back->con;
retval = 0;
break;
}
}
if (retval)
goto err;
if (!con_is_bound(csw))
goto err;
first = max(first, con_driver->first);
last = min(last, con_driver->last);
for (i = first; i <= last; i++) {
if (con_driver_map[i] == csw) {
module_put(csw->owner);
con_driver_map[i] = NULL;
}
}
if (!con_is_bound(defcsw)) {
const struct consw *defconsw = conswitchp;
defcsw->con_startup();
con_back->flag |= CON_DRIVER_FLAG_INIT;
/*
* vgacon may change the default driver to point
* to dummycon, we restore it here...
*/
conswitchp = defconsw;
}
if (!con_is_bound(csw))
con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
/* ignore return value, binding should not fail */
do_bind_con_driver(defcsw, first, last, deflt);
err:
module_put(owner);
return retval;
}
EXPORT_SYMBOL_GPL(do_unbind_con_driver);
static int vt_bind(struct con_driver *con)
{
const struct consw *defcsw = NULL, *csw = NULL;
int i, more = 1, first = -1, last = -1, deflt = 0;
if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
goto err;
csw = con->con;
for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
struct con_driver *con = &registered_con_driver[i];
if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
defcsw = con->con;
break;
}
}
if (!defcsw)
goto err;
while (more) {
more = 0;
for (i = con->first; i <= con->last; i++) {
if (con_driver_map[i] == defcsw) {
if (first == -1)
first = i;
last = i;
more = 1;
} else if (first != -1)
break;
}
if (first == 0 && last == MAX_NR_CONSOLES -1)
deflt = 1;
if (first != -1)
do_bind_con_driver(csw, first, last, deflt);
first = -1;
last = -1;
deflt = 0;
}
err:
return 0;
}
static int vt_unbind(struct con_driver *con)
{
const struct consw *csw = NULL;
int i, more = 1, first = -1, last = -1, deflt = 0;
int ret;
if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
goto err;
csw = con->con;
while (more) {
more = 0;
for (i = con->first; i <= con->last; i++) {
if (con_driver_map[i] == csw) {
if (first == -1)
first = i;
last = i;
more = 1;
} else if (first != -1)
break;
}
if (first == 0 && last == MAX_NR_CONSOLES -1)
deflt = 1;
if (first != -1) {
ret = do_unbind_con_driver(csw, first, last, deflt);
if (ret != 0)
return ret;
}
first = -1;
last = -1;
deflt = 0;
}
err:
return 0;
}
#else
static inline int vt_bind(struct con_driver *con)
{
return 0;
}
static inline int vt_unbind(struct con_driver *con)
{
return 0;
}
#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct con_driver *con = dev_get_drvdata(dev);
int bind = simple_strtoul(buf, NULL, 0);
console_lock();
if (bind)
vt_bind(con);
else
vt_unbind(con);
console_unlock();
return count;
}
static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct con_driver *con = dev_get_drvdata(dev);
int bind = con_is_bound(con->con);
return snprintf(buf, PAGE_SIZE, "%i\n", bind);
}
static ssize_t show_name(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct con_driver *con = dev_get_drvdata(dev);
return snprintf(buf, PAGE_SIZE, "%s %s\n",
(con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
con->desc);
}
static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
static struct attribute *con_dev_attrs[] = {
&dev_attr_bind.attr,
&dev_attr_name.attr,
NULL
};
ATTRIBUTE_GROUPS(con_dev);
static int vtconsole_init_device(struct con_driver *con)
{
con->flag |= CON_DRIVER_FLAG_ATTR;
return 0;
}
static void vtconsole_deinit_device(struct con_driver *con)
{
con->flag &= ~CON_DRIVER_FLAG_ATTR;
}
/**
* con_is_bound - checks if driver is bound to the console
* @csw: console driver
*
* RETURNS: zero if unbound, nonzero if bound
*
* Drivers can call this and if zero, they should release
* all resources allocated on con_startup()
*/
int con_is_bound(const struct consw *csw)
{
int i, bound = 0;
for (i = 0; i < MAX_NR_CONSOLES; i++) {
if (con_driver_map[i] == csw) {
bound = 1;
break;
}
}
return bound;
}
EXPORT_SYMBOL(con_is_bound);
/**
* con_debug_enter - prepare the console for the kernel debugger
* @sw: console driver
*
* Called when the console is taken over by the kernel debugger, this
* function needs to save the current console state, then put the console
* into a state suitable for the kernel debugger.
*
* RETURNS:
* Zero on success, nonzero if a failure occurred when trying to prepare
* the console for the debugger.
*/
int con_debug_enter(struct vc_data *vc)
{
int ret = 0;
saved_fg_console = fg_console;
saved_last_console = last_console;
saved_want_console = want_console;
saved_vc_mode = vc->vc_mode;
saved_console_blanked = console_blanked;
vc->vc_mode = KD_TEXT;
console_blanked = 0;
if (vc->vc_sw->con_debug_enter)
ret = vc->vc_sw->con_debug_enter(vc);
#ifdef CONFIG_KGDB_KDB
/* Set the initial LINES variable if it is not already set */
if (vc->vc_rows < 999) {
int linecount;
char lns[4];
const char *setargs[3] = {
"set",
"LINES",
lns,
};
if (kdbgetintenv(setargs[0], &linecount)) {
snprintf(lns, 4, "%i", vc->vc_rows);
kdb_set(2, setargs);
}
}
if (vc->vc_cols < 999) {
int colcount;
char cols[4];
const char *setargs[3] = {
"set",
"COLUMNS",
cols,
};
if (kdbgetintenv(setargs[0], &colcount)) {
snprintf(cols, 4, "%i", vc->vc_cols);
kdb_set(2, setargs);
}
}
#endif /* CONFIG_KGDB_KDB */
return ret;
}
EXPORT_SYMBOL_GPL(con_debug_enter);
/**
* con_debug_leave - restore console state
* @sw: console driver
*
* Restore the console state to what it was before the kernel debugger
* was invoked.
*
* RETURNS:
* Zero on success, nonzero if a failure occurred when trying to restore
* the console.
*/
int con_debug_leave(void)
{
struct vc_data *vc;
int ret = 0;
fg_console = saved_fg_console;
last_console = saved_last_console;
want_console = saved_want_console;
console_blanked = saved_console_blanked;
vc_cons[fg_console].d->vc_mode = saved_vc_mode;
vc = vc_cons[fg_console].d;
if (vc->vc_sw->con_debug_leave)
ret = vc->vc_sw->con_debug_leave(vc);
return ret;
}
EXPORT_SYMBOL_GPL(con_debug_leave);
static int do_register_con_driver(const struct consw *csw, int first, int last)
{
struct module *owner = csw->owner;
struct con_driver *con_driver;
const char *desc;
int i, retval;
WARN_CONSOLE_UNLOCKED();
if (!try_module_get(owner))
return -ENODEV;
for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
con_driver = &registered_con_driver[i];
/* already registered */
if (con_driver->con == csw) {
retval = -EBUSY;
goto err;
}
}
desc = csw->con_startup();
if (!desc) {
retval = -ENODEV;
goto err;
}
retval = -EINVAL;
for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
con_driver = &registered_con_driver[i];
if (con_driver->con == NULL &&
!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
con_driver->con = csw;
con_driver->desc = desc;
con_driver->node = i;
con_driver->flag = CON_DRIVER_FLAG_MODULE |
CON_DRIVER_FLAG_INIT;
con_driver->first = first;
con_driver->last = last;
retval = 0;
break;
}
}
if (retval)
goto err;
con_driver->dev =
device_create_with_groups(vtconsole_class, NULL,
MKDEV(0, con_driver->node),
con_driver, con_dev_groups,
"vtcon%i", con_driver->node);
if (IS_ERR(con_driver->dev)) {
printk(KERN_WARNING "Unable to create device for %s; "
"errno = %ld\n", con_driver->desc,
PTR_ERR(con_driver->dev));
con_driver->dev = NULL;
} else {
vtconsole_init_device(con_driver);
}
err:
module_put(owner);
return retval;
}
/**
* do_unregister_con_driver - unregister console driver from console layer
* @csw: console driver
*
* DESCRIPTION: All drivers that registers to the console layer must
* call this function upon exit, or if the console driver is in a state
* where it won't be able to handle console services, such as the
* framebuffer console without loaded framebuffer drivers.
*
* The driver must unbind first prior to unregistration.
*/
int do_unregister_con_driver(const struct consw *csw)
{
int i;
/* cannot unregister a bound driver */
if (con_is_bound(csw))
return -EBUSY;
if (csw == conswitchp)
return -EINVAL;
for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
struct con_driver *con_driver = &registered_con_driver[i];
if (con_driver->con == csw) {
/*
* Defer the removal of the sysfs entries since that
* will acquire the kernfs s_active lock and we can't
* acquire this lock while holding the console lock:
* the unbind sysfs entry imposes already the opposite
* order. Reset con already here to prevent any later
* lookup to succeed and mark this slot as zombie, so
* it won't get reused until we complete the removal
* in the deferred work.
*/
con_driver->con = NULL;
con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
schedule_work(&con_driver_unregister_work);
return 0;
}
}
return -ENODEV;
}
EXPORT_SYMBOL_GPL(do_unregister_con_driver);
static void con_driver_unregister_callback(struct work_struct *ignored)
{
int i;
console_lock();
for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
struct con_driver *con_driver = &registered_con_driver[i];
if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
continue;
console_unlock();
vtconsole_deinit_device(con_driver);
device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
console_lock();
if (WARN_ON_ONCE(con_driver->con))
con_driver->con = NULL;
con_driver->desc = NULL;
con_driver->dev = NULL;
con_driver->node = 0;
WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
con_driver->flag = 0;
con_driver->first = 0;
con_driver->last = 0;
}
console_unlock();
}
/*
* 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.
*
* do_take_over_console is basically a register followed by unbind
*/
int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
{
int err;
err = do_register_con_driver(csw, first, last);
/*
* If we get an busy error we still want to bind the console driver
* and return success, as we may have unbound the console driver
* but not unregistered it.
*/
if (err == -EBUSY)
err = 0;
if (!err)
do_bind_con_driver(csw, first, last, deflt);
return err;
}
EXPORT_SYMBOL_GPL(do_take_over_console);
/*
* give_up_console is a wrapper to unregister_con_driver. It will only
* work if driver is fully unbound.
*/
void give_up_console(const struct consw *csw)
{
console_lock();
do_unregister_con_driver(csw);
console_unlock();
}
static int __init vtconsole_class_init(void)
{
int i;
vtconsole_class = class_create(THIS_MODULE, "vtconsole");
if (IS_ERR(vtconsole_class)) {
printk(KERN_WARNING "Unable to create vt console class; "
"errno = %ld\n", PTR_ERR(vtconsole_class));
vtconsole_class = NULL;
}
/* Add system drivers to sysfs */
for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
struct con_driver *con = &registered_con_driver[i];
if (con->con && !con->dev) {
con->dev =
device_create_with_groups(vtconsole_class, NULL,
MKDEV(0, con->node),
con, con_dev_groups,
"vtcon%i", con->node);
if (IS_ERR(con->dev)) {
printk(KERN_WARNING "Unable to create "
"device for %s; errno = %ld\n",
con->desc, PTR_ERR(con->dev));
con->dev = NULL;
} else {
vtconsole_init_device(con);
}
}
}
return 0;
}
postcore_initcall(vtconsole_class_init);
#endif
/*
* Screen blanking
*/
static int set_vesa_blanking(char __user *p)
{
unsigned int mode;
if (get_user(mode, p + 1))
return -EFAULT;
vesa_blank_mode = (mode < 4) ? mode : 0;
return 0;
}
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;
vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
}
return;
}
/* 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;
blank_state = blank_off;
set_origin(vc);
return;
}
if (blank_state != blank_normal_wait)
return;
blank_state = blank_off;
/* 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, vesa_off_interval ? 1 : (vesa_blank_mode + 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 && vesa_blank_mode) {
blank_state = blank_vesa_wait;
mod_timer(&console_timer, jiffies + vesa_off_interval);
}
vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
}
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 */
pr_warn("unblank_screen: tty %d not allocated ??\n",
fg_console + 1);
return;
}
vc = vc_cons[fg_console].d;
/* Try to unblank in oops case too */
if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
return; /* but leave console_blanked != 0 */
if (blankinterval) {
mod_timer(&console_timer, jiffies + (blankinterval * HZ));
blank_state = blank_normal_wait;
}
console_blanked = 0;
if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
/* 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);
vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
}
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 mutex
* (console operations can still happen at irq time, but only from printk which
* has the console mutex. Not perfect yet, but better than no locking
*/
static void blank_screen_t(unsigned long dummy)
{
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 * HZ));
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->vc_sw->con_set_palette(vc, color_table);
}
/*
* 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 i, j, k;
unsigned char colormap[3*16];
if (copy_from_user(colormap, arg, sizeof(colormap)))
return -EFAULT;
console_lock();
for (i = k = 0; i < 16; i++) {
default_red[i] = colormap[k++];
default_grn[i] = colormap[k++];
default_blu[i] = colormap[k++];
}
for (i = 0; i < MAX_NR_CONSOLES; i++) {
if (!vc_cons_allocated(i))
continue;
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);
}
console_unlock();
return 0;
}
int con_get_cmap(unsigned char __user *arg)
{
int i, k;
unsigned char colormap[3*16];
console_lock();
for (i = k = 0; i < 16; i++) {
colormap[k++] = default_red[i];
colormap[k++] = default_grn[i];
colormap[k++] = default_blu[i];
}
console_unlock();
if (copy_to_user(arg, colormap, sizeof(colormap)))
return -EFAULT;
return 0;
}
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 up to 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 (op->data) {
font.data = kmalloc(max_font_size, GFP_KERNEL);
if (!font.data)
return -ENOMEM;
} else
font.data = NULL;
console_lock();
if (vc->vc_mode != KD_TEXT)
rc = -EINVAL;
else if (vc->vc_sw->con_font_get)
rc = vc->vc_sw->con_font_get(vc, &font);
else
rc = -ENOSYS;
console_unlock();
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 = memdup_user(op->data, size);
if (IS_ERR(font.data))
return PTR_ERR(font.data);
console_lock();
if (vc->vc_mode != KD_TEXT)
rc = -EINVAL;
else if (vc->vc_sw->con_font_set)
rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
else
rc = -ENOSYS;
console_unlock();
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 (!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;
console_lock();
if (vc->vc_mode != KD_TEXT) {
console_unlock();
return -EINVAL;
}
if (vc->vc_sw->con_font_default)
rc = vc->vc_sw->con_font_default(vc, &font, s);
else
rc = -ENOSYS;
console_unlock();
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;
console_lock();
if (vc->vc_mode != KD_TEXT)
rc = -EINVAL;
else 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);
console_unlock();
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;
}
EXPORT_SYMBOL_GPL(screen_glyph);
/* 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);
}
EXPORT_SYMBOL_GPL(screen_pos);
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)
{
hide_cursor(vc);
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);
}
}
void vcs_scr_updated(struct vc_data *vc)
{
notify_update(vc);
}
void vc_scrolldelta_helper(struct vc_data *c, int lines,
unsigned int rolled_over, void *base, unsigned int size)
{
unsigned long ubase = (unsigned long)base;
ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
ptrdiff_t origin = (void *)c->vc_origin - base;
int margin = c->vc_size_row * 4;
int from, wrap, from_off, avail;
/* Turn scrollback off */
if (!lines) {
c->vc_visible_origin = c->vc_origin;
return;
}
/* Do we have already enough to allow jumping from 0 to the end? */
if (rolled_over > scr_end + margin) {
from = scr_end;
wrap = rolled_over + c->vc_size_row;
} else {
from = 0;
wrap = size;
}
from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
avail = (origin - from + wrap) % wrap;
/* Only a little piece would be left? Show all incl. the piece! */
if (avail < 2 * margin)
margin = 0;
if (from_off < margin)
from_off = 0;
if (from_off > avail - margin)
from_off = avail;
c->vc_visible_origin = ubase + (from + from_off) % wrap;
}
EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
/*
* 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);
EXPORT_SYMBOL(global_cursor_default);
#ifndef VT_SINGLE_DRIVER
EXPORT_SYMBOL(give_up_console);
#endif