diff options
Diffstat (limited to 'drivers/tty/vt/vt.c')
| -rw-r--r-- | drivers/tty/vt/vt.c | 4230 |
1 files changed, 4230 insertions, 0 deletions
diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c new file mode 100644 index 000000000000..76407eca9ab0 --- /dev/null +++ b/drivers/tty/vt/vt.c @@ -0,0 +1,4230 @@ +/* + * linux/drivers/char/vt.c + * + * Copyright (C) 1991, 1992 Linus Torvalds + */ + +/* + * Hopefully this will be a rather complete VT102 implementation. + * + * Beeping thanks to John T Kohl. + * + * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics + * Chars, and VT100 enhancements by Peter MacDonald. + * + * Copy and paste function by Andrew Haylett, + * some enhancements by Alessandro Rubini. + * + * Code to check for different video-cards mostly by Galen Hunt, + * <g-hunt@ee.utah.edu> + * + * Rudimentary ISO 10646/Unicode/UTF-8 character set support by + * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>. + * + * Dynamic allocation of consoles, aeb@cwi.nl, May 1994 + * Resizing of consoles, aeb, 940926 + * + * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94 + * <poe@daimi.aau.dk> + * + * User-defined bell sound, new setterm control sequences and printk + * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95 + * + * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp> + * + * Merge with the abstract console driver by Geert Uytterhoeven + * <geert@linux-m68k.org>, Jan 1997. + * + * Original m68k console driver modifications by + * + * - Arno Griffioen <arno@usn.nl> + * - David Carter <carter@cs.bris.ac.uk> + * + * The abstract console driver provides a generic interface for a text + * console. It supports VGA text mode, frame buffer based graphical consoles + * and special graphics processors that are only accessible through some + * registers (e.g. a TMS340x0 GSP). + * + * The interface to the hardware is specified using a special structure + * (struct consw) which contains function pointers to console operations + * (see <linux/console.h> for more information). + * + * Support for changeable cursor shape + * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997 + * + * Ported to i386 and con_scrolldelta fixed + * by Emmanuel Marty <core@ggi-project.org>, April 1998 + * + * Resurrected character buffers in videoram plus lots of other trickery + * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998 + * + * Removed old-style timers, introduced console_timer, made timer + * deletion SMP-safe. 17Jun00, Andrew Morton + * + * 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.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/smp_lock.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 <asm/system.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 + +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) + +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 blank_screen_t(unsigned long dummy); +static void set_palette(struct vc_data *vc); + +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 = 10*60; +core_param(consoleblank, blankinterval, int, 0444); + +static DECLARE_WORK(console_work, console_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, unicode = unicode }; + atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, ¶m); +} + +static void notify_update(struct vc_data *vc) +{ + struct vt_notifier_param param = { .vc = vc }; + atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, ¶m); +} +/* + * Low-Level Functions + */ + +#define IS_FG(vc) ((vc)->vc_num == fg_console) + +#ifdef VT_BUF_VRAM_ONLY +#define DO_UPDATE(vc) 0 +#else +#define DO_UPDATE(vc) (CON_IS_VISIBLE(vc) && !console_blanked) +#endif + +static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed) +{ + unsigned short *p; + + if (!viewed) + p = (unsigned short *)(vc->vc_origin + offset); + else if (!vc->vc_sw->con_screen_pos) + p = (unsigned short *)(vc->vc_visible_origin + offset); + else + p = vc->vc_sw->con_screen_pos(vc, offset); + return p; +} + +/* 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 scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr) +{ + unsigned short *d, *s; + + if (t+nr >= b) + nr = b - t - 1; + if (b > vc->vc_rows || t >= b || nr < 1) + return; + if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr)) + return; + d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t); + s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr)); + scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row); + scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char, + vc->vc_size_row * nr); +} + +static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr) +{ + unsigned short *s; + unsigned int step; + + if (t+nr >= b) + nr = b - t - 1; + if (b > vc->vc_rows || t >= b || nr < 1) + return; + if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr)) + return; + s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t); + step = vc->vc_cols * nr; + scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row); + scr_memsetw(s, vc->vc_video_erase_char, 2 * step); +} + +static void do_update_region(struct vc_data *vc, unsigned long start, int count) +{ +#ifndef VT_BUF_VRAM_ONLY + unsigned int xx, yy, offset; + u16 *p; + + p = (u16 *) start; + if (!vc->vc_sw->con_getxy) { + offset = (start - vc->vc_origin) / 2; + xx = offset % vc->vc_cols; + yy = offset / vc->vc_cols; + } else { + int nxx, nyy; + start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy); + xx = nxx; yy = nyy; + } + for(;;) { + u16 attrib = scr_readw(p) & 0xff00; + int startx = xx; + u16 *q = p; + while (xx < vc->vc_cols && count) { + if (attrib != (scr_readw(p) & 0xff00)) { + if (p > q) + vc->vc_sw->con_putcs(vc, q, p-q, yy, startx); + startx = xx; + q = p; + attrib = scr_readw(p) & 0xff00; + } + p++; + xx++; + count--; + } + if (p > q) + vc->vc_sw->con_putcs(vc, q, p-q, yy, startx); + if (!count) + break; + xx = 0; + yy++; + if (vc->vc_sw->con_getxy) { + p = (u16 *)start; + start = vc->vc_sw->con_getxy(vc, start, NULL, NULL); + } + } +#endif +} + +void update_region(struct vc_data *vc, unsigned long start, int count) +{ + WARN_CONSOLE_UNLOCKED(); + + if (DO_UPDATE(vc)) { + hide_cursor(vc); + do_update_region(vc, start, count); + set_cursor(vc); + } +} + +/* Structure of attributes is hardware-dependent */ + +static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink, + u8 _underline, u8 _reverse, u8 _italic) +{ + if (vc->vc_sw->con_build_attr) + return vc->vc_sw->con_build_attr(vc, _color, _intensity, + _blink, _underline, _reverse, _italic); + +#ifndef VT_BUF_VRAM_ONLY +/* + * ++roman: I completely changed the attribute format for monochrome + * mode (!can_do_color). The formerly used MDA (monochrome display + * adapter) format didn't allow the combination of certain effects. + * Now the attribute is just a bit vector: + * Bit 0..1: intensity (0..2) + * Bit 2 : underline + * Bit 3 : reverse + * Bit 7 : blink + */ + { + u8 a = _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; + } +#else + return 0; +#endif +} + +static void update_attr(struct vc_data *vc) +{ + vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity, + vc->vc_blink, vc->vc_underline, + vc->vc_reverse ^ vc->vc_decscnm, vc->vc_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); +#ifndef VT_BUF_VRAM_ONLY + else { + u16 *q = p; + int cnt = count; + u16 a; + + if (!vc->vc_can_do_color) { + while (cnt--) { + a = scr_readw(q); + a ^= 0x0800; + scr_writew(a, q); + q++; + } + } else if (vc->vc_hi_font_mask == 0x100) { + while (cnt--) { + a = scr_readw(q); + a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4); + scr_writew(a, q); + q++; + } + } else { + while (cnt--) { + a = scr_readw(q); + a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4); + scr_writew(a, q); + q++; + } + } + } +#endif + if (DO_UPDATE(vc)) + do_update_region(vc, (unsigned long) p, count); +} + +/* used by selection: complement pointer position */ +void complement_pos(struct vc_data *vc, int offset) +{ + static int old_offset = -1; + static unsigned short old; + static unsigned short oldx, oldy; + + WARN_CONSOLE_UNLOCKED(); + + if (old_offset != -1 && old_offset >= 0 && + old_offset < vc->vc_screenbuf_size) { + scr_writew(old, screenpos(vc, old_offset, 1)); + if (DO_UPDATE(vc)) + vc->vc_sw->con_putc(vc, old, oldy, oldx); + } + + old_offset = offset; + + if (offset != -1 && offset >= 0 && + offset < vc->vc_screenbuf_size) { + unsigned short new; + unsigned short *p; + p = screenpos(vc, offset, 1); + old = scr_readw(p); + new = old ^ vc->vc_complement_mask; + scr_writew(new, p); + if (DO_UPDATE(vc)) { + oldx = (offset >> 1) % vc->vc_cols; + oldy = (offset >> 1) / vc->vc_cols; + vc->vc_sw->con_putc(vc, new, oldy, oldx); + } + } + +} + +static void insert_char(struct vc_data *vc, unsigned int nr) +{ + unsigned short *p, *q = (unsigned short *)vc->vc_pos; + + p = q + vc->vc_cols - nr - vc->vc_x; + while (--p >= q) + scr_writew(scr_readw(p), p + nr); + scr_memsetw(q, vc->vc_video_erase_char, nr * 2); + vc->vc_need_wrap = 0; + if (DO_UPDATE(vc)) { + unsigned short oldattr = vc->vc_attr; + vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1, + vc->vc_cols - vc->vc_x - nr); + vc->vc_attr = vc->vc_video_erase_char >> 8; + while (nr--) + vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr); + vc->vc_attr = oldattr; + } +} + +static void delete_char(struct vc_data *vc, unsigned int nr) +{ + unsigned int i = vc->vc_x; + unsigned short *p = (unsigned short *)vc->vc_pos; + + while (++i <= vc->vc_cols - nr) { + scr_writew(scr_readw(p+nr), p); + p++; + } + scr_memsetw(p, vc->vc_video_erase_char, nr * 2); + vc->vc_need_wrap = 0; + if (DO_UPDATE(vc)) { + unsigned short oldattr = vc->vc_attr; + vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1, + vc->vc_cols - vc->vc_x - nr); + vc->vc_attr = vc->vc_video_erase_char >> 8; + while (nr--) + vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, + vc->vc_cols - 1 - nr); + vc->vc_attr = oldattr; + } +} + +static int softcursor_original; + +static void add_softcursor(struct vc_data *vc) +{ + int i = scr_readw((u16 *) vc->vc_pos); + u32 type = vc->vc_cursor_type; + + if (! (type & 0x10)) return; + if (softcursor_original != -1) return; + softcursor_original = i; + i |= ((type >> 8) & 0xff00 ); + i ^= ((type) & 0xff00 ); + if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000; + if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700; + scr_writew(i, (u16 *) vc->vc_pos); + if (DO_UPDATE(vc)) + vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x); +} + +static void hide_softcursor(struct vc_data *vc) +{ + if (softcursor_original != -1) { + scr_writew(softcursor_original, (u16 *)vc->vc_pos); + if (DO_UPDATE(vc)) + vc->vc_sw->con_putc(vc, softcursor_original, + vc->vc_y, vc->vc_x); + softcursor_original = -1; + } +} + +static void hide_cursor(struct vc_data *vc) +{ + if (vc == sel_cons) + clear_selection(); + vc->vc_sw->con_cursor(vc, CM_ERASE); + hide_softcursor(vc); +} + +static void set_cursor(struct vc_data *vc) +{ + if (!IS_FG(vc) || console_blanked || + vc->vc_mode == KD_GRAPHICS) + return; + if (vc->vc_deccm) { + if (vc == sel_cons) + clear_selection(); + add_softcursor(vc); + if ((vc->vc_cursor_type & 0x0f) != 1) + vc->vc_sw->con_cursor(vc, CM_DRAW); + } else + hide_cursor(vc); +} + +static void set_origin(struct vc_data *vc) +{ + WARN_CONSOLE_UNLOCKED(); + + if (!CON_IS_VISIBLE(vc) || + !vc->vc_sw->con_set_origin || + !vc->vc_sw->con_set_origin(vc)) + vc->vc_origin = (unsigned long)vc->vc_screenbuf; + vc->vc_visible_origin = vc->vc_origin; + vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size; + vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x; +} + +static inline void save_screen(struct vc_data *vc) +{ + WARN_CONSOLE_UNLOCKED(); + + if (vc->vc_sw->con_save_screen) + vc->vc_sw->con_save_screen(vc); +} + +/* + * Redrawing of screen + */ + +static void clear_buffer_attributes(struct vc_data *vc) +{ + unsigned short *p = (unsigned short *)vc->vc_origin; + int count = vc->vc_screenbuf_size / 2; + int mask = vc->vc_hi_font_mask | 0xff; + + for (; count > 0; count--, p++) { + scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p); + } +} + +void redraw_screen(struct vc_data *vc, int is_switch) +{ + int redraw = 0; + + WARN_CONSOLE_UNLOCKED(); + + if (!vc) { + /* strange ... */ + /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */ + return; + } + + if (is_switch) { + struct vc_data *old_vc = vc_cons[fg_console].d; + if (old_vc == vc) + return; + if (!CON_IS_VISIBLE(vc)) + redraw = 1; + *vc->vc_display_fg = vc; + fg_console = vc->vc_num; + hide_cursor(old_vc); + if (!CON_IS_VISIBLE(old_vc)) { + save_screen(old_vc); + set_origin(old_vc); + } + 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; + vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir; + vc->vc_uni_pagedir = 0; + vc->vc_hi_font_mask = 0; + vc->vc_complement_mask = 0; + vc->vc_can_do_color = 0; + vc->vc_panic_force_write = false; + vc->vc_sw->con_init(vc, init); + if (!vc->vc_complement_mask) + vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800; + vc->vc_s_complement_mask = vc->vc_complement_mask; + vc->vc_size_row = vc->vc_cols << 1; + vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row; +} + +int vc_allocate(unsigned int currcons) /* return 0 on success */ +{ + WARN_CONSOLE_UNLOCKED(); + + if (currcons >= MAX_NR_CONSOLES) + return -ENXIO; + if (!vc_cons[currcons].d) { + struct vc_data *vc; + struct vt_notifier_param param; + + /* prevent users from taking too much memory */ + if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE)) + return -EPERM; + + /* due to the granularity of kmalloc, we waste some memory here */ + /* the alloc is done in two steps, to optimize the common situation + of a 25x80 console (structsize=216, screenbuf_size=4000) */ + /* although the numbers above are not valid since long ago, the + point is still up-to-date and the comment still has its value + even if only as a historical artifact. --mj, July 1998 */ + 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) { + kfree(vc); + vc_cons[currcons].d = NULL; + return -ENOMEM; + } + + /* 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, ¶m); + } + return 0; +} + +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 mutex 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_cols, old_rows, old_row_size, old_screen_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; + + newscreen = kmalloc(new_screen_size, GFP_USER); + if (!newscreen) + return -ENOMEM; + + old_rows = vc->vc_rows; + old_cols = vc->vc_cols; + old_row_size = vc->vc_size_row; + old_screen_size = vc->vc_screenbuf_size; + + err = resize_screen(vc, new_cols, new_rows, 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_mutex 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; + + acquire_console_sem(); + ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row); + release_console_sem(); + return ret; +} + +void vc_deallocate(unsigned int currcons) +{ + WARN_CONSOLE_UNLOCKED(); + + if (vc_cons_allocated(currcons)) { + struct vc_data *vc = vc_cons[currcons].d; + struct vt_notifier_param param = { .vc = vc }; + + atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, ¶m); + 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); + if (currcons >= MIN_NR_CONSOLES) + kfree(vc); + vc_cons[currcons].d = NULL; + } +} + +/* + * VT102 emulator + */ + +#define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x)) +#define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x)) +#define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x)) + +#define decarm VC_REPEAT +#define decckm VC_CKMODE +#define kbdapplic VC_APPLIC +#define lnm VC_CRLF + +/* + * this is what the terminal answers to a ESC-Z or csi0c query. + */ +#define VT100ID "\033[?1;2c" +#define VT102ID "\033[?6c" + +unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7, + 8,12,10,14, 9,13,11,15 }; + +/* the default colour table, for VGA+ colour systems */ +int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa, + 0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff}; +int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa, + 0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff}; +int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa, + 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff}; + +module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR); +module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR); +module_param_array(default_blu, int, 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, int lines) +{ + if (!lines) + lines = vc->vc_rows / 2; + scrolldelta(-lines); +} + +void scrollfront(struct vc_data *vc, int lines) +{ + if (!lines) + lines = vc->vc_rows / 2; + scrolldelta(lines); +} + +static void lf(struct vc_data *vc) +{ + /* don't scroll if above bottom of scrolling region, or + * if below scrolling region + */ + if (vc->vc_y + 1 == vc->vc_bottom) + scrup(vc, vc->vc_top, vc->vc_bottom, 1); + else if (vc->vc_y < vc->vc_rows - 1) { + vc->vc_y++; + vc->vc_pos += vc->vc_size_row; + } + vc->vc_need_wrap = 0; + 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) + scrdown(vc, vc->vc_top, vc->vc_bottom, 1); + else if (vc->vc_y > 0) { + vc->vc_y--; + vc->vc_pos -= vc->vc_size_row; + } + vc->vc_need_wrap = 0; +} + +static inline void cr(struct vc_data *vc) +{ + vc->vc_pos -= vc->vc_x << 1; + vc->vc_need_wrap = vc->vc_x = 0; + 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; + if (DO_UPDATE(vc)) { + /* do in two stages */ + vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, + vc->vc_cols - vc->vc_x); + vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0, + vc->vc_rows - vc->vc_y - 1, + vc->vc_cols); + } + break; + case 1: /* erase from start to cursor */ + count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1; + start = (unsigned short *)vc->vc_origin; + if (DO_UPDATE(vc)) { + /* do in two stages */ + vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y, + vc->vc_cols); + vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1, + vc->vc_x + 1); + } + break; + case 2: /* erase whole display */ + count = vc->vc_cols * vc->vc_rows; + start = (unsigned short *)vc->vc_origin; + if (DO_UPDATE(vc)) + vc->vc_sw->con_clear(vc, 0, 0, + vc->vc_rows, + vc->vc_cols); + break; + default: + return; + } + scr_memsetw(start, vc->vc_video_erase_char, 2 * count); + vc->vc_need_wrap = 0; +} + +static void csi_K(struct vc_data *vc, int vpar) +{ + unsigned int count; + unsigned short * start; + + switch (vpar) { + case 0: /* erase from cursor to end of line */ + count = vc->vc_cols - vc->vc_x; + start = (unsigned short *)vc->vc_pos; + if (DO_UPDATE(vc)) + vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, + vc->vc_cols - vc->vc_x); + break; + case 1: /* erase from start of line to cursor */ + start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1)); + count = vc->vc_x + 1; + if (DO_UPDATE(vc)) + vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1, + vc->vc_x + 1); + break; + case 2: /* erase whole line */ + start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1)); + count = vc->vc_cols; + if (DO_UPDATE(vc)) + vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1, + vc->vc_cols); + break; + default: + return; + } + scr_memsetw(start, vc->vc_video_erase_char, 2 * count); + vc->vc_need_wrap = 0; +} + +static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */ +{ /* not vt100? */ + int count; + + if (!vpar) + vpar++; + count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar; + + scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count); + if (DO_UPDATE(vc)) + vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count); + vc->vc_need_wrap = 0; +} + +static void default_attr(struct vc_data *vc) +{ + vc->vc_intensity = 1; + vc->vc_italic = 0; + vc->vc_underline = 0; + vc->vc_reverse = 0; + vc->vc_blink = 0; + vc->vc_color = vc->vc_def_color; +} + +/* console_sem is held */ +static void csi_m(struct vc_data *vc) +{ + int i; + + for (i = 0; i <= vc->vc_npar; i++) + switch (vc->vc_par[i]) { + case 0: /* all attributes off */ + default_attr(vc); + break; + case 1: + vc->vc_intensity = 2; + break; + case 2: + vc->vc_intensity = 0; + break; + case 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: /* ANSI X3.64-1979 (SCO-ish?) + * Enables underscore, white foreground + * with white underscore (Linux - use + * default foreground). + */ + vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0); + vc->vc_underline = 1; + break; + case 39: /* ANSI X3.64-1979 (SCO-ish?) + * Disable underline option. + * Reset colour to default? It did this + * before... + */ + vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0); + vc->vc_underline = 0; + break; + case 49: + vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f); + break; + default: + if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37) + vc->vc_color = color_table[vc->vc_par[i] - 30] + | (vc->vc_color & 0xf0); + else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47) + vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4) + | (vc->vc_color & 0x0f); + break; + } + update_attr(vc); +} + +static void respond_string(const char *p, struct tty_struct *tty) +{ + while (*p) { + tty_insert_flip_char(tty, *p, 0); + p++; + } + con_schedule_flip(tty); +} + +static void cursor_report(struct vc_data *vc, struct tty_struct *tty) +{ + char buf[40]; + + sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1); + respond_string(buf, tty); +} + +static inline void status_report(struct tty_struct *tty) +{ + respond_string("\033[0n", tty); /* Terminal ok */ +} + +static inline void respond_ID(struct tty_struct * tty) +{ + respond_string(VT102ID, tty); +} + +void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry) +{ + char buf[8]; + + sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx), + (char)('!' + mry)); + respond_string(buf, tty); +} + +/* invoked via ioctl(TIOCLINUX) and through set_selection */ +int mouse_reporting(void) +{ + return vc_cons[fg_console].d->vc_report_mouse; +} + +/* console_sem is held */ +static void set_mode(struct vc_data *vc, int on_off) +{ + int i; + + for (i = 0; i <= vc->vc_npar; i++) + if (vc->vc_ques) { + switch(vc->vc_par[i]) { /* DEC private modes set/reset */ + case 1: /* Cursor keys send ^[Ox/^[[x */ + if (on_off) + set_kbd(vc, decckm); + else + clr_kbd(vc, decckm); + break; + case 3: /* 80/132 mode switch unimplemented */ + vc->vc_deccolm = on_off; +#if 0 + vc_resize(deccolm ? 132 : 80, vc->vc_rows); + /* this alone does not suffice; some user mode + utility has to change the hardware regs */ +#endif + break; + case 5: /* Inverted screen on/off */ + if (vc->vc_decscnm != on_off) { + vc->vc_decscnm = on_off; + invert_screen(vc, 0, vc->vc_screenbuf_size, 0); + update_attr(vc); + } + break; + case 6: /* Origin relative/absolute */ + vc->vc_decom = on_off; + gotoxay(vc, 0, 0); + break; + case 7: /* Autowrap on/off */ + vc->vc_decawm = on_off; + break; + case 8: /* Autorepeat on/off */ + if (on_off) + set_kbd(vc, decarm); + else + clr_kbd(vc, decarm); + break; + case 9: + vc->vc_report_mouse = on_off ? 1 : 0; + break; + case 25: /* Cursor on/off */ + vc->vc_deccm = on_off; + break; + case 1000: + vc->vc_report_mouse = on_off ? 2 : 0; + break; + } + } else { + switch(vc->vc_par[i]) { /* ANSI modes set/reset */ + case 3: /* Monitor (display ctrls) */ + vc->vc_disp_ctrl = on_off; + break; + case 4: /* Insert Mode on/off */ + vc->vc_decim = on_off; + break; + case 20: /* Lf, Enter == CrLf/Lf */ + if (on_off) + set_kbd(vc, lnm); + else + clr_kbd(vc, lnm); + break; + } + } +} + +/* console_sem is held */ +static void setterm_command(struct vc_data *vc) +{ + switch(vc->vc_par[0]) { + case 1: /* set color for underline mode */ + if (vc->vc_can_do_color && + vc->vc_par[1] < 16) { + vc->vc_ulcolor = color_table[vc->vc_par[1]]; + if (vc->vc_underline) + update_attr(vc); + } + break; + case 2: /* set color for half intensity mode */ + if (vc->vc_can_do_color && + vc->vc_par[1] < 16) { + vc->vc_halfcolor = color_table[vc->vc_par[1]]; + if (vc->vc_intensity == 0) + update_attr(vc); + } + break; + case 8: /* store colors as defaults */ + vc->vc_def_color = vc->vc_attr; + if (vc->vc_hi_font_mask == 0x100) + vc->vc_def_color >>= 1; + default_attr(vc); + update_attr(vc); + break; + case 9: /* set blanking interval */ + blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60; + poke_blanked_console(); + break; + case 10: /* set bell frequency in Hz */ + if (vc->vc_npar >= 1) + vc->vc_bell_pitch = vc->vc_par[1]; + else + vc->vc_bell_pitch = DEFAULT_BELL_PITCH; + break; + case 11: /* set bell duration in msec */ + if (vc->vc_npar >= 1) + vc->vc_bell_duration = (vc->vc_par[1] < 2000) ? + vc->vc_par[1] * HZ / 1000 : 0; + else + vc->vc_bell_duration = DEFAULT_BELL_DURATION; + break; + case 12: /* bring specified console to the front */ + if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1)) + set_console(vc->vc_par[1] - 1); + break; + case 13: /* unblank the screen */ + poke_blanked_console(); + break; + case 14: /* set vesa powerdown interval */ + vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ; + break; + case 15: /* activate the previous console */ + set_console(last_console); + break; + } +} + +/* console_sem is held */ +static void csi_at(struct vc_data *vc, unsigned int nr) +{ + if (nr > vc->vc_cols - vc->vc_x) + nr = vc->vc_cols - vc->vc_x; + else if (!nr) + nr = 1; + insert_char(vc, nr); +} + +/* console_sem is held */ +static void csi_L(struct vc_data *vc, unsigned int nr) +{ + if (nr > vc->vc_rows - vc->vc_y) + nr = vc->vc_rows - vc->vc_y; + else if (!nr) + nr = 1; + scrdown(vc, vc->vc_y, vc->vc_bottom, nr); + vc->vc_need_wrap = 0; +} + +/* console_sem is held */ +static void csi_P(struct vc_data *vc, unsigned int nr) +{ + if (nr > vc->vc_cols - vc->vc_x) + nr = vc->vc_cols - vc->vc_x; + else if (!nr) + nr = 1; + delete_char(vc, nr); +} + +/* console_sem is held */ +static void csi_M(struct vc_data *vc, unsigned int nr) +{ + if (nr > vc->vc_rows - vc->vc_y) + nr = vc->vc_rows - vc->vc_y; + else if (!nr) + nr=1; + scrup(vc, vc->vc_y, vc->vc_bottom, nr); + vc->vc_need_wrap = 0; +} + +/* console_sem is held (except via vc_init->reset_terminal */ +static void save_cur(struct vc_data *vc) +{ + vc->vc_saved_x = vc->vc_x; + vc->vc_saved_y = vc->vc_y; + vc->vc_s_intensity = vc->vc_intensity; + vc->vc_s_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_sem is held */ +static void restore_cur(struct vc_data *vc) +{ + gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y); + vc->vc_intensity = vc->vc_s_intensity; + vc->vc_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, ESgotpars, ESfunckey, + EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd, + ESpalette }; + +/* console_sem is held (except via vc_init()) */ +static void reset_terminal(struct vc_data *vc, int do_clear) +{ + vc->vc_top = 0; + vc->vc_bottom = vc->vc_rows; + vc->vc_state = ESnormal; + vc->vc_ques = 0; + vc->vc_translate = set_translate(LAT1_MAP, vc); + vc->vc_G0_charset = LAT1_MAP; + vc->vc_G1_charset = GRAF_MAP; + vc->vc_charset = 0; + vc->vc_need_wrap = 0; + vc->vc_report_mouse = 0; + vc->vc_utf = 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; + + set_kbd(vc, decarm); + clr_kbd(vc, decckm); + clr_kbd(vc, kbdapplic); + clr_kbd(vc, lnm); + kbd_table[vc->vc_num].lockstate = 0; + kbd_table[vc->vc_num].slockstate = 0; + kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS; + kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate; + /* do not do set_leds here because this causes an endless tasklet loop + when the keyboard hasn't been initialized yet */ + + vc->vc_cursor_type = cur_default; + vc->vc_complement_mask = vc->vc_s_complement_mask; + + default_attr(vc); + update_attr(vc); + + vc->vc_tab_stop[0] = 0x01010100; + vc->vc_tab_stop[1] = + vc->vc_tab_stop[2] = + vc->vc_tab_stop[3] = + vc->vc_tab_stop[4] = + 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; + + gotoxy(vc, 0, 0); + save_cur(vc); + if (do_clear) + csi_J(vc, 2); +} + +/* console_sem is held */ +static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c) +{ + /* + * Control characters can be used in the _middle_ + * of an escape sequence. + */ + switch (c) { + case 0: + return; + case 7: + if (vc->vc_bell_duration) + kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration); + return; + case 8: + bs(vc); + return; + case 9: + vc->vc_pos -= (vc->vc_x << 1); + while (vc->vc_x < vc->vc_cols - 1) { + vc->vc_x++; + if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31))) + break; + } + vc->vc_pos += (vc->vc_x << 1); + 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 + 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; + } else + vc->vc_state = ESgotpars; + case ESgotpars: + vc->vc_state = ESnormal; + switch(c) { + case 'h': + set_mode(vc, 1); + return; + case 'l': + set_mode(vc, 0); + return; + case 'c': + if (vc->vc_ques) { + if (vc->vc_par[0]) + vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16); + else + vc->vc_cursor_type = cur_default; + return; + } + break; + case 'm': + if (vc->vc_ques) { + clear_selection(); + if (vc->vc_par[0]) + vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1]; + else + vc->vc_complement_mask = vc->vc_s_complement_mask; + return; + } + break; + case 'n': + if (!vc->vc_ques) { + if (vc->vc_par[0] == 5) + status_report(tty); + else if (vc->vc_par[0] == 6) + cursor_report(vc, tty); + } + return; + } + if (vc->vc_ques) { + vc->vc_ques = 0; + return; + } + switch(c) { + case 'G': case '`': + if (vc->vc_par[0]) + vc->vc_par[0]--; + gotoxy(vc, vc->vc_par[0], vc->vc_y); + return; + case 'A': + if (!vc->vc_par[0]) + vc->vc_par[0]++; + gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]); + return; + case 'B': case 'e': + if (!vc->vc_par[0]) + vc->vc_par[0]++; + gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]); + return; + case 'C': case 'a': + if (!vc->vc_par[0]) + vc->vc_par[0]++; + gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y); + return; + case 'D': + if (!vc->vc_par[0]) + vc->vc_par[0]++; + gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y); + return; + case 'E': + if (!vc->vc_par[0]) + vc->vc_par[0]++; + gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]); + return; + case 'F': + if (!vc->vc_par[0]) + vc->vc_par[0]++; + gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]); + return; + case 'd': + if (vc->vc_par[0]) + vc->vc_par[0]--; + gotoxay(vc, vc->vc_x ,vc->vc_par[0]); + return; + case 'H': case 'f': + if (vc->vc_par[0]) + vc->vc_par[0]--; + if (vc->vc_par[1]) + vc->vc_par[1]--; + gotoxay(vc, vc->vc_par[1], vc->vc_par[0]); + return; + case 'J': + csi_J(vc, vc->vc_par[0]); + return; + case 'K': + csi_K(vc, vc->vc_par[0]); + return; + case 'L': + csi_L(vc, vc->vc_par[0]); + return; + case 'M': + csi_M(vc, vc->vc_par[0]); + return; + case 'P': + csi_P(vc, vc->vc_par[0]); + return; + case 'c': + if (!vc->vc_par[0]) + respond_ID(tty); + return; + case 'g': + if (!vc->vc_par[0]) + vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31)); + else if (vc->vc_par[0] == 3) { + vc->vc_tab_stop[0] = + vc->vc_tab_stop[1] = + vc->vc_tab_stop[2] = + vc->vc_tab_stop[3] = + vc->vc_tab_stop[4] = + 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) + setledstate(kbd_table + vc->vc_num, + (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4); + return; + case 'r': + if (!vc->vc_par[0]) + vc->vc_par[0]++; + if (!vc->vc_par[1]) + vc->vc_par[1] = vc->vc_rows; + /* Minimum allowed region is 2 lines */ + if (vc->vc_par[0] < vc->vc_par[1] && + vc->vc_par[1] <= vc->vc_rows) { + vc->vc_top = vc->vc_par[0] - 1; + vc->vc_bottom = vc->vc_par[1]; + gotoxay(vc, 0, 0); + } + return; + case 's': + save_cur(vc); + return; + case 'u': + restore_cur(vc); + return; + case 'X': + csi_X(vc, vc->vc_par[0]); + return; + case '@': + csi_at(vc, vc->vc_par[0]); + return; + case ']': /* setterm functions */ + setterm_command(vc); + return; + } + return; + case ESpercent: + vc->vc_state = ESnormal; + switch (c) { + case '@': /* defined in ISO 2022 */ + vc->vc_utf = 0; + return; + case 'G': /* prelim official escape code */ + case '8': /* retained for compatibility */ + vc->vc_utf = 1; + return; + } + return; + case ESfunckey: + vc->vc_state = ESnormal; + return; + case EShash: + vc->vc_state = ESnormal; + if (c == '8') { + /* DEC screen alignment test. kludge :-) */ + vc->vc_video_erase_char = + (vc->vc_video_erase_char & 0xff00) | 'E'; + csi_J(vc, 2); + vc->vc_video_erase_char = + (vc->vc_video_erase_char & 0xff00) | ' '; + do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2); + } + return; + case ESsetG0: + if (c == '0') + vc->vc_G0_charset = GRAF_MAP; + else if (c == 'B') + vc->vc_G0_charset = LAT1_MAP; + else if (c == 'U') + vc->vc_G0_charset = IBMPC_MAP; + else if (c == 'K') + vc->vc_G0_charset = USER_MAP; + if (vc->vc_charset == 0) + vc->vc_translate = set_translate(vc->vc_G0_charset, vc); + vc->vc_state = ESnormal; + return; + case ESsetG1: + if (c == '0') + vc->vc_G1_charset = GRAF_MAP; + else if (c == 'B') + vc->vc_G1_charset = LAT1_MAP; + else if (c == 'U') + vc->vc_G1_charset = IBMPC_MAP; + else if (c == 'K') + vc->vc_G1_charset = USER_MAP; + if (vc->vc_charset == 1) + vc->vc_translate = set_translate(vc->vc_G1_charset, vc); + vc->vc_state = ESnormal; + return; + default: + vc->vc_state = ESnormal; + } +} + +/* This is a temporary buffer used to prepare a tty console write + * so that we can easily avoid touching user space while holding the + * console spinlock. It is allocated in con_init and is shared by + * this code and the vc_screen read/write tty calls. + * + * We have to allocate this statically in the kernel data section + * since console_init (and thus con_init) are called before any + * kernel memory allocation is available. + */ +char con_buf[CON_BUF_SIZE]; +DEFINE_MUTEX(con_buf_mtx); + +/* 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); +} + +/* acquires console_sem */ +static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count) +{ +#ifdef VT_BUF_VRAM_ONLY +#define FLUSH do { } while(0); +#else +#define FLUSH if (draw_x >= 0) { \ + vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \ + draw_x = -1; \ + } +#endif + + int c, tc, ok, n = 0, draw_x = -1; + unsigned int currcons; + unsigned long draw_from = 0, draw_to = 0; + struct vc_data *vc; + 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(); + + acquire_console_sem(); + vc = tty->driver_data; + if (vc == NULL) { + printk(KERN_ERR "vt: argh, driver_data is NULL !\n"); + release_console_sem(); + return 0; + } + + currcons = vc->vc_num; + if (!vc_cons_allocated(currcons)) { + /* could this happen? */ + printk_once("con_write: tty %d not allocated\n", currcons+1); + release_console_sem(); + return 0; + } + + himask = vc->vc_hi_font_mask; + charmask = himask ? 0x1ff : 0xff; + + /* undraw cursor first */ + if (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, + ¶m) == 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); + } + FLUSH + } + + while (1) { + if (vc->vc_need_wrap || vc->vc_decim) + FLUSH + if (vc->vc_need_wrap) { + cr(vc); + lf(vc); + } + if (vc->vc_decim) + insert_char(vc, 1); + scr_writew(himask ? + ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) : + (vc_attr << 8) + tc, + (u16 *) vc->vc_pos); + if (DO_UPDATE(vc) && draw_x < 0) { + draw_x = vc->vc_x; + draw_from = vc->vc_pos; + } + if (vc->vc_x == vc->vc_cols - 1) { + vc->vc_need_wrap = vc->vc_decawm; + draw_to = vc->vc_pos + 2; + } else { + vc->vc_x++; + draw_to = (vc->vc_pos += 2); + } + + 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) { + FLUSH + } + + if (rescan) { + rescan = 0; + inverse = 0; + width = 1; + c = orig; + goto rescan_last_byte; + } + continue; + } + FLUSH + do_con_trol(tty, vc, orig); + } + FLUSH + console_conditional_schedule(); + release_console_sem(); + notify_update(vc); + return n; +#undef FLUSH +} + +/* + * This is the console switching callback. + * + * Doing console switching in a process context allows + * us to do the switches asynchronously (needed when we want + * to switch due to a keyboard interrupt). Synchronization + * with other console code and prevention of re-entrancy is + * ensured with console_sem. + */ +static void console_callback(struct work_struct *ignored) +{ + acquire_console_sem(); + + if (want_console >= 0) { + if (want_console != fg_console && + vc_cons_allocated(want_console)) { + hide_cursor(vc_cons[fg_console].d); + change_console(vc_cons[want_console].d); + /* we only changed when the console had already + been allocated - a new console is not created + in an interrupt routine */ + } + want_console = -1; + } + if (do_poke_blanked_console) { /* do not unblank for a LED change */ + do_poke_blanked_console = 0; + poke_blanked_console(); + } + if (scrollback_delta) { + struct vc_data *vc = vc_cons[fg_console].d; + clear_selection(); + if (vc->vc_mode == KD_TEXT) + vc->vc_sw->con_scrolldelta(vc, scrollback_delta); + scrollback_delta = 0; + } + if (blank_timer_expired) { + do_blank_screen(0); + blank_timer_expired = 0; + } + notify_update(vc_cons[fg_console].d); + + release_console_sem(); +} + +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 (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_sem(). + * + * There are some functions which don't need it. + * + * There are some functions which can sleep for arbitrary periods + * (paste_selection) but we don't need the lock there anyway. + * + * set_selection has locking, and definitely needs it + */ + +int tioclinux(struct tty_struct *tty, unsigned long arg) +{ + char type, data; + char __user *p = (char __user *)arg; + int lines; + int ret; + + if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN)) + return -EPERM; + if (get_user(type, p)) + return -EFAULT; + ret = 0; + + switch (type) + { + case TIOCL_SETSEL: + acquire_console_sem(); + ret = set_selection((struct tiocl_selection __user *)(p+1), tty); + release_console_sem(); + break; + case TIOCL_PASTESEL: + ret = paste_selection(tty); + break; + case TIOCL_UNBLANKSCREEN: + acquire_console_sem(); + unblank_screen(); + release_console_sem(); + break; + case TIOCL_SELLOADLUT: + ret = sel_loadlut(p); + break; + case TIOCL_GETSHIFTSTATE: + + /* + * Make it possible to react to Shift+Mousebutton. + * Note that 'shift_state' is an undocumented + * kernel-internal variable; programs not closely + * related to the kernel should not use this. + */ + data = shift_state; + ret = __put_user(data, p); + break; + case TIOCL_GETMOUSEREPORTING: + data = mouse_reporting(); + ret = __put_user(data, p); + break; + case TIOCL_SETVESABLANK: + ret = set_vesa_blanking(p); + 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: + ret = fg_console; + break; + case TIOCL_SCROLLCONSOLE: + if (get_user(lines, (s32 __user *)(p+4))) { + ret = -EFAULT; + } else { + scrollfront(vc_cons[fg_console].d, lines); + ret = 0; + } + break; + case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */ + acquire_console_sem(); + ignore_poke = 1; + do_blank_screen(0); + release_console_sem(); + break; + case TIOCL_BLANKEDSCREEN: + ret = console_blanked; + break; + default: + ret = -EINVAL; + break; + } + return ret; +} + +/* + * /dev/ttyN handling + */ + +static int con_write(struct tty_struct *tty, const unsigned char *buf, int count) +{ + int retval; + + retval = do_con_write(tty, buf, count); + con_flush_chars(tty); + + return retval; +} + +static 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; + set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK); + set_leds(); +} + +/* + * Turn the Scroll-Lock LED off when the console is started + */ +static void con_start(struct tty_struct *tty) +{ + int console_num; + if (!tty) + return; + console_num = tty->index; + if (!vc_cons_allocated(console_num)) + return; + clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK); + set_leds(); +} + +static void con_flush_chars(struct tty_struct *tty) +{ + struct vc_data *vc; + + if (in_interrupt()) /* from flush_to_ldisc */ + return; + + /* if we race with con_close(), vt may be null */ + acquire_console_sem(); + vc = tty->driver_data; + if (vc) + set_cursor(vc); + release_console_sem(); +} + +/* + * Allocate the console screen memory. + */ +static int con_open(struct tty_struct *tty, struct file *filp) +{ + unsigned int currcons = tty->index; + int ret = 0; + + acquire_console_sem(); + if (tty->driver_data == NULL) { + ret = vc_allocate(currcons); + if (ret == 0) { + struct vc_data *vc = vc_cons[currcons].d; + + /* Still being freed */ + if (vc->port.tty) { + release_console_sem(); + return -ERESTARTSYS; + } + 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; + release_console_sem(); + return ret; + } + } + release_console_sem(); + return ret; +} + +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); + acquire_console_sem(); + vc->port.tty = NULL; + release_console_sem(); + tty_shutdown(tty); +} + +static int default_italic_color = 2; // green (ASCII) +static int default_underline_color = 3; // cyan (ASCII) +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 = 0x07; /* white */ + 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; + + acquire_console_sem(); + + if (conswitchp) + display_desc = conswitchp->con_startup(); + if (!display_desc) { + fg_console = 0; + release_console_sem(); + return 0; + } + + for (i = 0; i < MAX_NR_CON_DRIVER; i++) { + struct con_driver *con_driver = ®istered_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); + printk("Console: %s %s %dx%d", + vc->vc_can_do_color ? "colour" : "mono", + display_desc, vc->vc_cols, vc->vc_rows); + printable = 1; + printk("\n"); + + release_console_sem(); + +#ifdef CONFIG_VT_CONSOLE + register_console(&vt_console_driver); +#endif + return 0; +} +console_initcall(con_init); + +static const struct tty_operations con_ops = { + .open = con_open, + .close = con_close, + .write = con_write, + .write_room = con_write_room, + .put_char = con_put_char, + .flush_chars = con_flush_chars, + .chars_in_buffer = con_chars_in_buffer, + .ioctl = vt_ioctl, +#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); + +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(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0"); + if (IS_ERR(tty0dev)) + tty0dev = NULL; + else + device_create_file(tty0dev, &dev_attr_active); + + vcs_init(); + + console_driver = alloc_tty_driver(MAX_NR_CONSOLES); + if (!console_driver) + panic("Couldn't allocate console driver\n"); + console_driver->owner = THIS_MODULE; + console_driver->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 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; + + acquire_console_sem(); + + /* check if driver is registered */ + for (i = 0; i < MAX_NR_CON_DRIVER; i++) { + con_driver = ®istered_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); + } + + printk("Console: switching "); + if (!deflt) + printk("consoles %d-%d ", first+1, last+1); + if (j >= 0) { + struct vc_data *vc = vc_cons[j].d; + + printk("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("to %s\n", desc); + + retval = 0; +err: + release_console_sem(); + module_put(owner); + return retval; +}; + +#ifdef CONFIG_VT_HW_CONSOLE_BINDING +static int con_is_graphics(const struct consw *csw, int first, int last) +{ + int i, retval = 0; + + for (i = first; i <= last; i++) { + struct vc_data *vc = vc_cons[i].d; + + if (vc && vc->vc_mode == KD_GRAPHICS) { + retval = 1; + break; + } + } + + return retval; +} + +/** + * unbind_con_driver - unbind a console driver + * @csw: pointer to console driver to unregister + * @first: first in range of consoles that @csw should be unbound from + * @last: last in range of consoles that @csw should be unbound from + * @deflt: should next bound console driver be default after @csw is unbound? + * + * To unbind a driver from all possible consoles, pass 0 as @first and + * %MAX_NR_CONSOLES as @last. + * + * @deflt controls whether the console that ends up replacing @csw should be + * the default console. + * + * RETURNS: + * -ENODEV if @csw isn't a registered console driver or can't be unregistered + * or 0 on success. + */ +int 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; + + acquire_console_sem(); + + /* check if driver is registered and if it is unbindable */ + for (i = 0; i < MAX_NR_CON_DRIVER; i++) { + con_driver = ®istered_con_driver[i]; + + if (con_driver->con == csw && + con_driver->flag & CON_DRIVER_FLAG_MODULE) { + retval = 0; + break; + } + } + + if (retval) { + release_console_sem(); + goto err; + } + + retval = -ENODEV; + + /* check if backup driver exists */ + for (i = 0; i < MAX_NR_CON_DRIVER; i++) { + con_back = ®istered_con_driver[i]; + + if (con_back->con && + !(con_back->flag & CON_DRIVER_FLAG_MODULE)) { + defcsw = con_back->con; + retval = 0; + break; + } + } + + if (retval) { + release_console_sem(); + goto err; + } + + if (!con_is_bound(csw)) { + release_console_sem(); + 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; + + release_console_sem(); + /* ignore return value, binding should not fail */ + bind_con_driver(defcsw, first, last, deflt); +err: + module_put(owner); + return retval; + +} +EXPORT_SYMBOL(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) || + con_is_graphics(con->con, con->first, con->last)) + goto err; + + csw = con->con; + + for (i = 0; i < MAX_NR_CON_DRIVER; i++) { + struct con_driver *con = ®istered_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) + 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; + + if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) || + con_is_graphics(con->con, con->first, con->last)) + 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) + unbind_con_driver(csw, first, last, deflt); + + 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); + + if (bind) + vt_bind(con); + else + vt_unbind(con); + + 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 struct device_attribute device_attrs[] = { + __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind), + __ATTR(name, S_IRUGO, show_name, NULL), +}; + +static int vtconsole_init_device(struct con_driver *con) +{ + int i; + int error = 0; + + con->flag |= CON_DRIVER_FLAG_ATTR; + dev_set_drvdata(con->dev, con); + for (i = 0; i < ARRAY_SIZE(device_attrs); i++) { + error = device_create_file(con->dev, &device_attrs[i]); + if (error) + break; + } + + if (error) { + while (--i >= 0) + device_remove_file(con->dev, &device_attrs[i]); + con->flag &= ~CON_DRIVER_FLAG_ATTR; + } + + return error; +} + +static void vtconsole_deinit_device(struct con_driver *con) +{ + int i; + + if (con->flag & CON_DRIVER_FLAG_ATTR) { + for (i = 0; i < ARRAY_SIZE(device_attrs); i++) + device_remove_file(con->dev, &device_attrs[i]); + 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); + } + } +#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); + +/** + * register_con_driver - register console driver to console layer + * @csw: console driver + * @first: the first console to take over, minimum value is 0 + * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1 + * + * DESCRIPTION: This function registers a console driver which can later + * bind to a range of consoles specified by @first and @last. It will + * also initialize the console driver by calling con_startup(). + */ +int 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 = 0; + + if (!try_module_get(owner)) + return -ENODEV; + + acquire_console_sem(); + + for (i = 0; i < MAX_NR_CON_DRIVER; i++) { + con_driver = ®istered_con_driver[i]; + + /* already registered */ + if (con_driver->con == csw) + retval = -EINVAL; + } + + if (retval) + goto err; + + desc = csw->con_startup(); + + if (!desc) + goto err; + + retval = -EINVAL; + + for (i = 0; i < MAX_NR_CON_DRIVER; i++) { + con_driver = ®istered_con_driver[i]; + + if (con_driver->con == NULL) { + 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(vtconsole_class, NULL, + MKDEV(0, con_driver->node), + NULL, "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: + release_console_sem(); + module_put(owner); + return retval; +} +EXPORT_SYMBOL(register_con_driver); + +/** + * 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 unregister_con_driver(const struct consw *csw) +{ + int i, retval = -ENODEV; + + acquire_console_sem(); + + /* cannot unregister a bound driver */ + if (con_is_bound(csw)) + goto err; + + for (i = 0; i < MAX_NR_CON_DRIVER; i++) { + struct con_driver *con_driver = ®istered_con_driver[i]; + + if (con_driver->con == csw && + con_driver->flag & CON_DRIVER_FLAG_MODULE) { + vtconsole_deinit_device(con_driver); + device_destroy(vtconsole_class, + MKDEV(0, con_driver->node)); + con_driver->con = NULL; + con_driver->desc = NULL; + con_driver->dev = NULL; + con_driver->node = 0; + con_driver->flag = 0; + con_driver->first = 0; + con_driver->last = 0; + retval = 0; + break; + } + } +err: + release_console_sem(); + return retval; +} +EXPORT_SYMBOL(unregister_con_driver); + +/* + * If we support more console drivers, this function is used + * when a driver wants to take over some existing consoles + * and become default driver for newly opened ones. + * + * take_over_console is basically a register followed by unbind + */ +int take_over_console(const struct consw *csw, int first, int last, int deflt) +{ + int err; + + err = register_con_driver(csw, first, last); + + if (!err) + bind_con_driver(csw, first, last, deflt); + + return err; +} + +/* + * 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) +{ + unregister_con_driver(csw); +} + +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 = ®istered_con_driver[i]; + + if (con->con && !con->dev) { + con->dev = device_create(vtconsole_class, NULL, + MKDEV(0, con->node), + NULL, "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 */ + printk("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) +{ + if (unlikely(!keventd_up())) { + mod_timer(&console_timer, jiffies + (blankinterval * HZ)); + return; + } + blank_timer_expired = 1; + schedule_work(&console_work); +} + +void poke_blanked_console(void) +{ + WARN_CONSOLE_UNLOCKED(); + + /* Add this so we quickly catch whoever might call us in a non + * safe context. Nowadays, unblank_screen() isn't to be called in + * atomic contexts and is allowed to schedule (with the special case + * of oops_in_progress, but that isn't of any concern for this + * function. --BenH. + */ + might_sleep(); + + /* This isn't perfectly race free, but a race here would be mostly harmless, + * at worse, we'll do a spurrious blank and it's unlikely + */ + del_timer(&console_timer); + blank_timer_expired = 0; + + if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS) + return; + if (console_blanked) + unblank_screen(); + else if (blankinterval) { + mod_timer(&console_timer, jiffies + (blankinterval * 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, color_table); +} + +static int set_get_cmap(unsigned char __user *arg, int set) +{ + int i, j, k; + + WARN_CONSOLE_UNLOCKED(); + + for (i = 0; i < 16; i++) + if (set) { + get_user(default_red[i], arg++); + get_user(default_grn[i], arg++); + get_user(default_blu[i], arg++); + } else { + put_user(default_red[i], arg++); + put_user(default_grn[i], arg++); + put_user(default_blu[i], arg++); + } + if (set) { + for (i = 0; i < MAX_NR_CONSOLES; i++) + if (vc_cons_allocated(i)) { + for (j = k = 0; j < 16; j++) { + vc_cons[i].d->vc_palette[k++] = default_red[j]; + vc_cons[i].d->vc_palette[k++] = default_grn[j]; + vc_cons[i].d->vc_palette[k++] = default_blu[j]; + } + set_palette(vc_cons[i].d); + } + } + return 0; +} + +/* + * Load palette into the DAC registers. arg points to a colour + * map, 3 bytes per colour, 16 colours, range from 0 to 255. + */ + +int con_set_cmap(unsigned char __user *arg) +{ + int rc; + + acquire_console_sem(); + rc = set_get_cmap (arg,1); + release_console_sem(); + + return rc; +} + +int con_get_cmap(unsigned char __user *arg) +{ + int rc; + + acquire_console_sem(); + rc = set_get_cmap (arg,0); + release_console_sem(); + + return rc; +} + +void reset_palette(struct vc_data *vc) +{ + int j, k; + for (j=k=0; j<16; j++) { + vc->vc_palette[k++] = default_red[j]; + vc->vc_palette[k++] = default_grn[j]; + vc->vc_palette[k++] = default_blu[j]; + } + set_palette(vc); +} + +/* + * Font switching + * + * Currently we only support fonts up to 32 pixels wide, at a maximum height + * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints, + * depending on width) reserved for each character which is kinda wasty, but + * this is done in order to maintain compatibility with the EGA/VGA fonts. It + * is upto the actual low-level console-driver convert data into its favorite + * format (maybe we should add a `fontoffset' field to the `display' + * structure so we won't have to convert the fontdata all the time. + * /Jes + */ + +#define max_font_size 65536 + +static int con_font_get(struct vc_data *vc, struct console_font_op *op) +{ + struct console_font font; + int rc = -EINVAL; + int c; + + if (vc->vc_mode != KD_TEXT) + return -EINVAL; + + if (op->data) { + font.data = kmalloc(max_font_size, GFP_KERNEL); + if (!font.data) + return -ENOMEM; + } else + font.data = NULL; + + acquire_console_sem(); + if (vc->vc_sw->con_font_get) + rc = vc->vc_sw->con_font_get(vc, &font); + else + rc = -ENOSYS; + release_console_sem(); + + if (rc) + goto out; + + c = (font.width+7)/8 * 32 * font.charcount; + + if (op->data && font.charcount > op->charcount) + rc = -ENOSPC; + if (!(op->flags & KD_FONT_FLAG_OLD)) { + if (font.width > op->width || font.height > op->height) + rc = -ENOSPC; + } else { + if (font.width != 8) + rc = -EIO; + else if ((op->height && font.height > op->height) || + font.height > 32) + rc = -ENOSPC; + } + if (rc) + goto out; + + op->height = font.height; + op->width = font.width; + op->charcount = font.charcount; + + if (op->data && copy_to_user(op->data, font.data, c)) + rc = -EFAULT; + +out: + kfree(font.data); + return rc; +} + +static int con_font_set(struct vc_data *vc, struct console_font_op *op) +{ + struct console_font font; + int rc = -EINVAL; + int size; + + if (vc->vc_mode != KD_TEXT) + return -EINVAL; + if (!op->data) + return -EINVAL; + if (op->charcount > 512) + return -EINVAL; + if (!op->height) { /* Need to guess font height [compat] */ + int h, i; + u8 __user *charmap = op->data; + u8 tmp; + + /* If from KDFONTOP ioctl, don't allow things which can be done in userland, + so that we can get rid of this soon */ + if (!(op->flags & KD_FONT_FLAG_OLD)) + return -EINVAL; + for (h = 32; h > 0; h--) + for (i = 0; i < op->charcount; i++) { + if (get_user(tmp, &charmap[32*i+h-1])) + return -EFAULT; + if (tmp) + goto nonzero; + } + return -EINVAL; + nonzero: + op->height = h; + } + if (op->width <= 0 || op->width > 32 || op->height > 32) + return -EINVAL; + size = (op->width+7)/8 * 32 * op->charcount; + if (size > max_font_size) + return -ENOSPC; + font.charcount = op->charcount; + font.height = op->height; + font.width = op->width; + font.data = memdup_user(op->data, size); + if (IS_ERR(font.data)) + return PTR_ERR(font.data); + acquire_console_sem(); + if (vc->vc_sw->con_font_set) + rc = vc->vc_sw->con_font_set(vc, &font, op->flags); + else + rc = -ENOSYS; + release_console_sem(); + kfree(font.data); + return rc; +} + +static int con_font_default(struct vc_data *vc, struct console_font_op *op) +{ + struct console_font font = {.width = op->width, .height = op->height}; + char name[MAX_FONT_NAME]; + char *s = name; + int rc; + + if (vc->vc_mode != KD_TEXT) + return -EINVAL; + + if (!op->data) + s = NULL; + else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0) + return -EFAULT; + else + name[MAX_FONT_NAME - 1] = 0; + + acquire_console_sem(); + if (vc->vc_sw->con_font_default) + rc = vc->vc_sw->con_font_default(vc, &font, s); + else + rc = -ENOSYS; + release_console_sem(); + if (!rc) { + op->width = font.width; + op->height = font.height; + } + return rc; +} + +static int con_font_copy(struct vc_data *vc, struct console_font_op *op) +{ + int con = op->height; + int rc; + + if (vc->vc_mode != KD_TEXT) + return -EINVAL; + + acquire_console_sem(); + if (!vc->vc_sw->con_font_copy) + rc = -ENOSYS; + else if (con < 0 || !vc_cons_allocated(con)) + rc = -ENOTTY; + else if (con == vc->vc_num) /* nothing to do */ + rc = 0; + else + rc = vc->vc_sw->con_font_copy(vc, con); + release_console_sem(); + return rc; +} + +int con_font_op(struct vc_data *vc, struct console_font_op *op) +{ + switch (op->op) { + case KD_FONT_OP_SET: + return con_font_set(vc, op); + case KD_FONT_OP_GET: + return con_font_get(vc, op); + case KD_FONT_OP_SET_DEFAULT: + return con_font_default(vc, op); + case KD_FONT_OP_COPY: + return con_font_copy(vc, op); + } + return -ENOSYS; +} + +/* + * Interface exported to selection and vcs. + */ + +/* used by selection */ +u16 screen_glyph(struct vc_data *vc, int offset) +{ + u16 w = scr_readw(screenpos(vc, offset, 1)); + u16 c = w & 0xff; + + if (w & vc->vc_hi_font_mask) + c |= 0x100; + return c; +} +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); +} + +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); +} + +/* + * 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(take_over_console); +EXPORT_SYMBOL(give_up_console); +#endif |