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0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  *  Copyright (C) 1991, 1992  Linus Torvalds
0004  */
0005 
0006 /*
0007  * Hopefully this will be a rather complete VT102 implementation.
0008  *
0009  * Beeping thanks to John T Kohl.
0010  *
0011  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
0012  *   Chars, and VT100 enhancements by Peter MacDonald.
0013  *
0014  * Copy and paste function by Andrew Haylett,
0015  *   some enhancements by Alessandro Rubini.
0016  *
0017  * Code to check for different video-cards mostly by Galen Hunt,
0018  * <g-hunt@ee.utah.edu>
0019  *
0020  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
0021  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
0022  *
0023  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
0024  * Resizing of consoles, aeb, 940926
0025  *
0026  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
0027  * <poe@daimi.aau.dk>
0028  *
0029  * User-defined bell sound, new setterm control sequences and printk
0030  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
0031  *
0032  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
0033  *
0034  * Merge with the abstract console driver by Geert Uytterhoeven
0035  * <geert@linux-m68k.org>, Jan 1997.
0036  *
0037  *   Original m68k console driver modifications by
0038  *
0039  *     - Arno Griffioen <arno@usn.nl>
0040  *     - David Carter <carter@cs.bris.ac.uk>
0041  * 
0042  *   The abstract console driver provides a generic interface for a text
0043  *   console. It supports VGA text mode, frame buffer based graphical consoles
0044  *   and special graphics processors that are only accessible through some
0045  *   registers (e.g. a TMS340x0 GSP).
0046  *
0047  *   The interface to the hardware is specified using a special structure
0048  *   (struct consw) which contains function pointers to console operations
0049  *   (see <linux/console.h> for more information).
0050  *
0051  * Support for changeable cursor shape
0052  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
0053  *
0054  * Ported to i386 and con_scrolldelta fixed
0055  * by Emmanuel Marty <core@ggi-project.org>, April 1998
0056  *
0057  * Resurrected character buffers in videoram plus lots of other trickery
0058  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
0059  *
0060  * Removed old-style timers, introduced console_timer, made timer
0061  * deletion SMP-safe.  17Jun00, Andrew Morton
0062  *
0063  * Removed console_lock, enabled interrupts across all console operations
0064  * 13 March 2001, Andrew Morton
0065  *
0066  * Fixed UTF-8 mode so alternate charset modes always work according
0067  * to control sequences interpreted in do_con_trol function
0068  * preserving backward VT100 semigraphics compatibility,
0069  * malformed UTF sequences represented as sequences of replacement glyphs,
0070  * original codes or '?' as a last resort if replacement glyph is undefined
0071  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
0072  */
0073 
0074 #include <linux/module.h>
0075 #include <linux/types.h>
0076 #include <linux/sched/signal.h>
0077 #include <linux/tty.h>
0078 #include <linux/tty_flip.h>
0079 #include <linux/kernel.h>
0080 #include <linux/string.h>
0081 #include <linux/errno.h>
0082 #include <linux/kd.h>
0083 #include <linux/slab.h>
0084 #include <linux/vmalloc.h>
0085 #include <linux/major.h>
0086 #include <linux/mm.h>
0087 #include <linux/console.h>
0088 #include <linux/init.h>
0089 #include <linux/mutex.h>
0090 #include <linux/vt_kern.h>
0091 #include <linux/selection.h>
0092 #include <linux/tiocl.h>
0093 #include <linux/kbd_kern.h>
0094 #include <linux/consolemap.h>
0095 #include <linux/timer.h>
0096 #include <linux/interrupt.h>
0097 #include <linux/workqueue.h>
0098 #include <linux/pm.h>
0099 #include <linux/font.h>
0100 #include <linux/bitops.h>
0101 #include <linux/notifier.h>
0102 #include <linux/device.h>
0103 #include <linux/io.h>
0104 #include <linux/uaccess.h>
0105 #include <linux/kdb.h>
0106 #include <linux/ctype.h>
0107 #include <linux/bsearch.h>
0108 #include <linux/gcd.h>
0109 
0110 #define MAX_NR_CON_DRIVER 16
0111 
0112 #define CON_DRIVER_FLAG_MODULE 1
0113 #define CON_DRIVER_FLAG_INIT   2
0114 #define CON_DRIVER_FLAG_ATTR   4
0115 #define CON_DRIVER_FLAG_ZOMBIE 8
0116 
0117 struct con_driver {
0118     const struct consw *con;
0119     const char *desc;
0120     struct device *dev;
0121     int node;
0122     int first;
0123     int last;
0124     int flag;
0125 };
0126 
0127 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
0128 const struct consw *conswitchp;
0129 
0130 /*
0131  * Here is the default bell parameters: 750HZ, 1/8th of a second
0132  */
0133 #define DEFAULT_BELL_PITCH  750
0134 #define DEFAULT_BELL_DURATION   (HZ/8)
0135 #define DEFAULT_CURSOR_BLINK_MS 200
0136 
0137 struct vc vc_cons [MAX_NR_CONSOLES];
0138 
0139 #ifndef VT_SINGLE_DRIVER
0140 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
0141 #endif
0142 
0143 static int con_open(struct tty_struct *, struct file *);
0144 static void vc_init(struct vc_data *vc, unsigned int rows,
0145             unsigned int cols, int do_clear);
0146 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
0147 static void save_cur(struct vc_data *vc);
0148 static void reset_terminal(struct vc_data *vc, int do_clear);
0149 static void con_flush_chars(struct tty_struct *tty);
0150 static int set_vesa_blanking(char __user *p);
0151 static void set_cursor(struct vc_data *vc);
0152 static void hide_cursor(struct vc_data *vc);
0153 static void console_callback(struct work_struct *ignored);
0154 static void con_driver_unregister_callback(struct work_struct *ignored);
0155 static void blank_screen_t(struct timer_list *unused);
0156 static void set_palette(struct vc_data *vc);
0157 
0158 #define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
0159 
0160 static int printable;       /* Is console ready for printing? */
0161 int default_utf8 = true;
0162 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
0163 int global_cursor_default = -1;
0164 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
0165 
0166 static int cur_default = CUR_UNDERLINE;
0167 module_param(cur_default, int, S_IRUGO | S_IWUSR);
0168 
0169 /*
0170  * ignore_poke: don't unblank the screen when things are typed.  This is
0171  * mainly for the privacy of braille terminal users.
0172  */
0173 static int ignore_poke;
0174 
0175 int do_poke_blanked_console;
0176 int console_blanked;
0177 
0178 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
0179 static int vesa_off_interval;
0180 static int blankinterval;
0181 core_param(consoleblank, blankinterval, int, 0444);
0182 
0183 static DECLARE_WORK(console_work, console_callback);
0184 static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
0185 
0186 /*
0187  * fg_console is the current virtual console,
0188  * last_console is the last used one,
0189  * want_console is the console we want to switch to,
0190  * saved_* variants are for save/restore around kernel debugger enter/leave
0191  */
0192 int fg_console;
0193 int last_console;
0194 int want_console = -1;
0195 static int saved_fg_console;
0196 static int saved_last_console;
0197 static int saved_want_console;
0198 static int saved_vc_mode;
0199 static int saved_console_blanked;
0200 
0201 /*
0202  * For each existing display, we have a pointer to console currently visible
0203  * on that display, allowing consoles other than fg_console to be refreshed
0204  * appropriately. Unless the low-level driver supplies its own display_fg
0205  * variable, we use this one for the "master display".
0206  */
0207 static struct vc_data *master_display_fg;
0208 
0209 /*
0210  * Unfortunately, we need to delay tty echo when we're currently writing to the
0211  * console since the code is (and always was) not re-entrant, so we schedule
0212  * all flip requests to process context with schedule-task() and run it from
0213  * console_callback().
0214  */
0215 
0216 /*
0217  * For the same reason, we defer scrollback to the console callback.
0218  */
0219 static int scrollback_delta;
0220 
0221 /*
0222  * Hook so that the power management routines can (un)blank
0223  * the console on our behalf.
0224  */
0225 int (*console_blank_hook)(int);
0226 
0227 static DEFINE_TIMER(console_timer, blank_screen_t);
0228 static int blank_state;
0229 static int blank_timer_expired;
0230 enum {
0231     blank_off = 0,
0232     blank_normal_wait,
0233     blank_vesa_wait,
0234 };
0235 
0236 /*
0237  * /sys/class/tty/tty0/
0238  *
0239  * the attribute 'active' contains the name of the current vc
0240  * console and it supports poll() to detect vc switches
0241  */
0242 static struct device *tty0dev;
0243 
0244 /*
0245  * Notifier list for console events.
0246  */
0247 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
0248 
0249 int register_vt_notifier(struct notifier_block *nb)
0250 {
0251     return atomic_notifier_chain_register(&vt_notifier_list, nb);
0252 }
0253 EXPORT_SYMBOL_GPL(register_vt_notifier);
0254 
0255 int unregister_vt_notifier(struct notifier_block *nb)
0256 {
0257     return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
0258 }
0259 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
0260 
0261 static void notify_write(struct vc_data *vc, unsigned int unicode)
0262 {
0263     struct vt_notifier_param param = { .vc = vc, .c = unicode };
0264     atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
0265 }
0266 
0267 static void notify_update(struct vc_data *vc)
0268 {
0269     struct vt_notifier_param param = { .vc = vc };
0270     atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
0271 }
0272 /*
0273  *  Low-Level Functions
0274  */
0275 
0276 static inline bool con_is_fg(const struct vc_data *vc)
0277 {
0278     return vc->vc_num == fg_console;
0279 }
0280 
0281 static inline bool con_should_update(const struct vc_data *vc)
0282 {
0283     return con_is_visible(vc) && !console_blanked;
0284 }
0285 
0286 static inline unsigned short *screenpos(const struct vc_data *vc, int offset,
0287         bool viewed)
0288 {
0289     unsigned short *p;
0290     
0291     if (!viewed)
0292         p = (unsigned short *)(vc->vc_origin + offset);
0293     else if (!vc->vc_sw->con_screen_pos)
0294         p = (unsigned short *)(vc->vc_visible_origin + offset);
0295     else
0296         p = vc->vc_sw->con_screen_pos(vc, offset);
0297     return p;
0298 }
0299 
0300 /* Called  from the keyboard irq path.. */
0301 static inline void scrolldelta(int lines)
0302 {
0303     /* FIXME */
0304     /* scrolldelta needs some kind of consistency lock, but the BKL was
0305        and still is not protecting versus the scheduled back end */
0306     scrollback_delta += lines;
0307     schedule_console_callback();
0308 }
0309 
0310 void schedule_console_callback(void)
0311 {
0312     schedule_work(&console_work);
0313 }
0314 
0315 /*
0316  * Code to manage unicode-based screen buffers
0317  */
0318 
0319 #ifdef NO_VC_UNI_SCREEN
0320 /* this disables and optimizes related code away at compile time */
0321 #define get_vc_uniscr(vc) NULL
0322 #else
0323 #define get_vc_uniscr(vc) vc->vc_uni_screen
0324 #endif
0325 
0326 #define VC_UNI_SCREEN_DEBUG 0
0327 
0328 typedef uint32_t char32_t;
0329 
0330 /*
0331  * Our screen buffer is preceded by an array of line pointers so that
0332  * scrolling only implies some pointer shuffling.
0333  */
0334 struct uni_screen {
0335     char32_t *lines[0];
0336 };
0337 
0338 static struct uni_screen *vc_uniscr_alloc(unsigned int cols, unsigned int rows)
0339 {
0340     struct uni_screen *uniscr;
0341     void *p;
0342     unsigned int memsize, i;
0343 
0344     /* allocate everything in one go */
0345     memsize = cols * rows * sizeof(char32_t);
0346     memsize += rows * sizeof(char32_t *);
0347     p = vzalloc(memsize);
0348     if (!p)
0349         return NULL;
0350 
0351     /* initial line pointers */
0352     uniscr = p;
0353     p = uniscr->lines + rows;
0354     for (i = 0; i < rows; i++) {
0355         uniscr->lines[i] = p;
0356         p += cols * sizeof(char32_t);
0357     }
0358     return uniscr;
0359 }
0360 
0361 static void vc_uniscr_free(struct uni_screen *uniscr)
0362 {
0363     vfree(uniscr);
0364 }
0365 
0366 static void vc_uniscr_set(struct vc_data *vc, struct uni_screen *new_uniscr)
0367 {
0368     vc_uniscr_free(vc->vc_uni_screen);
0369     vc->vc_uni_screen = new_uniscr;
0370 }
0371 
0372 static void vc_uniscr_putc(struct vc_data *vc, char32_t uc)
0373 {
0374     struct uni_screen *uniscr = get_vc_uniscr(vc);
0375 
0376     if (uniscr)
0377         uniscr->lines[vc->state.y][vc->state.x] = uc;
0378 }
0379 
0380 static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
0381 {
0382     struct uni_screen *uniscr = get_vc_uniscr(vc);
0383 
0384     if (uniscr) {
0385         char32_t *ln = uniscr->lines[vc->state.y];
0386         unsigned int x = vc->state.x, cols = vc->vc_cols;
0387 
0388         memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
0389         memset32(&ln[x], ' ', nr);
0390     }
0391 }
0392 
0393 static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
0394 {
0395     struct uni_screen *uniscr = get_vc_uniscr(vc);
0396 
0397     if (uniscr) {
0398         char32_t *ln = uniscr->lines[vc->state.y];
0399         unsigned int x = vc->state.x, cols = vc->vc_cols;
0400 
0401         memcpy(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
0402         memset32(&ln[cols - nr], ' ', nr);
0403     }
0404 }
0405 
0406 static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
0407                  unsigned int nr)
0408 {
0409     struct uni_screen *uniscr = get_vc_uniscr(vc);
0410 
0411     if (uniscr) {
0412         char32_t *ln = uniscr->lines[vc->state.y];
0413 
0414         memset32(&ln[x], ' ', nr);
0415     }
0416 }
0417 
0418 static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
0419                   unsigned int nr)
0420 {
0421     struct uni_screen *uniscr = get_vc_uniscr(vc);
0422 
0423     if (uniscr) {
0424         unsigned int cols = vc->vc_cols;
0425 
0426         while (nr--)
0427             memset32(uniscr->lines[y++], ' ', cols);
0428     }
0429 }
0430 
0431 static void vc_uniscr_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
0432                  enum con_scroll dir, unsigned int nr)
0433 {
0434     struct uni_screen *uniscr = get_vc_uniscr(vc);
0435 
0436     if (uniscr) {
0437         unsigned int i, j, k, sz, d, clear;
0438 
0439         sz = b - t;
0440         clear = b - nr;
0441         d = nr;
0442         if (dir == SM_DOWN) {
0443             clear = t;
0444             d = sz - nr;
0445         }
0446         for (i = 0; i < gcd(d, sz); i++) {
0447             char32_t *tmp = uniscr->lines[t + i];
0448             j = i;
0449             while (1) {
0450                 k = j + d;
0451                 if (k >= sz)
0452                     k -= sz;
0453                 if (k == i)
0454                     break;
0455                 uniscr->lines[t + j] = uniscr->lines[t + k];
0456                 j = k;
0457             }
0458             uniscr->lines[t + j] = tmp;
0459         }
0460         vc_uniscr_clear_lines(vc, clear, nr);
0461     }
0462 }
0463 
0464 static void vc_uniscr_copy_area(struct uni_screen *dst,
0465                 unsigned int dst_cols,
0466                 unsigned int dst_rows,
0467                 struct uni_screen *src,
0468                 unsigned int src_cols,
0469                 unsigned int src_top_row,
0470                 unsigned int src_bot_row)
0471 {
0472     unsigned int dst_row = 0;
0473 
0474     if (!dst)
0475         return;
0476 
0477     while (src_top_row < src_bot_row) {
0478         char32_t *src_line = src->lines[src_top_row];
0479         char32_t *dst_line = dst->lines[dst_row];
0480 
0481         memcpy(dst_line, src_line, src_cols * sizeof(char32_t));
0482         if (dst_cols - src_cols)
0483             memset32(dst_line + src_cols, ' ', dst_cols - src_cols);
0484         src_top_row++;
0485         dst_row++;
0486     }
0487     while (dst_row < dst_rows) {
0488         char32_t *dst_line = dst->lines[dst_row];
0489 
0490         memset32(dst_line, ' ', dst_cols);
0491         dst_row++;
0492     }
0493 }
0494 
0495 /*
0496  * Called from vcs_read() to make sure unicode screen retrieval is possible.
0497  * This will initialize the unicode screen buffer if not already done.
0498  * This returns 0 if OK, or a negative error code otherwise.
0499  * In particular, -ENODATA is returned if the console is not in UTF-8 mode.
0500  */
0501 int vc_uniscr_check(struct vc_data *vc)
0502 {
0503     struct uni_screen *uniscr;
0504     unsigned short *p;
0505     int x, y, mask;
0506 
0507     if (__is_defined(NO_VC_UNI_SCREEN))
0508         return -EOPNOTSUPP;
0509 
0510     WARN_CONSOLE_UNLOCKED();
0511 
0512     if (!vc->vc_utf)
0513         return -ENODATA;
0514 
0515     if (vc->vc_uni_screen)
0516         return 0;
0517 
0518     uniscr = vc_uniscr_alloc(vc->vc_cols, vc->vc_rows);
0519     if (!uniscr)
0520         return -ENOMEM;
0521 
0522     /*
0523      * Let's populate it initially with (imperfect) reverse translation.
0524      * This is the next best thing we can do short of having it enabled
0525      * from the start even when no users rely on this functionality. True
0526      * unicode content will be available after a complete screen refresh.
0527      */
0528     p = (unsigned short *)vc->vc_origin;
0529     mask = vc->vc_hi_font_mask | 0xff;
0530     for (y = 0; y < vc->vc_rows; y++) {
0531         char32_t *line = uniscr->lines[y];
0532         for (x = 0; x < vc->vc_cols; x++) {
0533             u16 glyph = scr_readw(p++) & mask;
0534             line[x] = inverse_translate(vc, glyph, true);
0535         }
0536     }
0537 
0538     vc->vc_uni_screen = uniscr;
0539     return 0;
0540 }
0541 
0542 /*
0543  * Called from vcs_read() to get the unicode data from the screen.
0544  * This must be preceded by a successful call to vc_uniscr_check() once
0545  * the console lock has been taken.
0546  */
0547 void vc_uniscr_copy_line(const struct vc_data *vc, void *dest, bool viewed,
0548              unsigned int row, unsigned int col, unsigned int nr)
0549 {
0550     struct uni_screen *uniscr = get_vc_uniscr(vc);
0551     int offset = row * vc->vc_size_row + col * 2;
0552     unsigned long pos;
0553 
0554     BUG_ON(!uniscr);
0555 
0556     pos = (unsigned long)screenpos(vc, offset, viewed);
0557     if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
0558         /*
0559          * Desired position falls in the main screen buffer.
0560          * However the actual row/col might be different if
0561          * scrollback is active.
0562          */
0563         row = (pos - vc->vc_origin) / vc->vc_size_row;
0564         col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
0565         memcpy(dest, &uniscr->lines[row][col], nr * sizeof(char32_t));
0566     } else {
0567         /*
0568          * Scrollback is active. For now let's simply backtranslate
0569          * the screen glyphs until the unicode screen buffer does
0570          * synchronize with console display drivers for a scrollback
0571          * buffer of its own.
0572          */
0573         u16 *p = (u16 *)pos;
0574         int mask = vc->vc_hi_font_mask | 0xff;
0575         char32_t *uni_buf = dest;
0576         while (nr--) {
0577             u16 glyph = scr_readw(p++) & mask;
0578             *uni_buf++ = inverse_translate(vc, glyph, true);
0579         }
0580     }
0581 }
0582 
0583 /* this is for validation and debugging only */
0584 static void vc_uniscr_debug_check(struct vc_data *vc)
0585 {
0586     struct uni_screen *uniscr = get_vc_uniscr(vc);
0587     unsigned short *p;
0588     int x, y, mask;
0589 
0590     if (!VC_UNI_SCREEN_DEBUG || !uniscr)
0591         return;
0592 
0593     WARN_CONSOLE_UNLOCKED();
0594 
0595     /*
0596      * Make sure our unicode screen translates into the same glyphs
0597      * as the actual screen. This is brutal indeed.
0598      */
0599     p = (unsigned short *)vc->vc_origin;
0600     mask = vc->vc_hi_font_mask | 0xff;
0601     for (y = 0; y < vc->vc_rows; y++) {
0602         char32_t *line = uniscr->lines[y];
0603         for (x = 0; x < vc->vc_cols; x++) {
0604             u16 glyph = scr_readw(p++) & mask;
0605             char32_t uc = line[x];
0606             int tc = conv_uni_to_pc(vc, uc);
0607             if (tc == -4)
0608                 tc = conv_uni_to_pc(vc, 0xfffd);
0609             if (tc == -4)
0610                 tc = conv_uni_to_pc(vc, '?');
0611             if (tc != glyph)
0612                 pr_err_ratelimited(
0613                     "%s: mismatch at %d,%d: glyph=%#x tc=%#x\n",
0614                     __func__, x, y, glyph, tc);
0615         }
0616     }
0617 }
0618 
0619 
0620 static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
0621         enum con_scroll dir, unsigned int nr)
0622 {
0623     u16 *clear, *d, *s;
0624 
0625     if (t + nr >= b)
0626         nr = b - t - 1;
0627     if (b > vc->vc_rows || t >= b || nr < 1)
0628         return;
0629     vc_uniscr_scroll(vc, t, b, dir, nr);
0630     if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
0631         return;
0632 
0633     s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
0634     d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
0635 
0636     if (dir == SM_UP) {
0637         clear = s + (b - t - nr) * vc->vc_cols;
0638         swap(s, d);
0639     }
0640     scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
0641     scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
0642 }
0643 
0644 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
0645 {
0646     unsigned int xx, yy, offset;
0647     u16 *p;
0648 
0649     p = (u16 *) start;
0650     if (!vc->vc_sw->con_getxy) {
0651         offset = (start - vc->vc_origin) / 2;
0652         xx = offset % vc->vc_cols;
0653         yy = offset / vc->vc_cols;
0654     } else {
0655         int nxx, nyy;
0656         start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
0657         xx = nxx; yy = nyy;
0658     }
0659     for(;;) {
0660         u16 attrib = scr_readw(p) & 0xff00;
0661         int startx = xx;
0662         u16 *q = p;
0663         while (xx < vc->vc_cols && count) {
0664             if (attrib != (scr_readw(p) & 0xff00)) {
0665                 if (p > q)
0666                     vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
0667                 startx = xx;
0668                 q = p;
0669                 attrib = scr_readw(p) & 0xff00;
0670             }
0671             p++;
0672             xx++;
0673             count--;
0674         }
0675         if (p > q)
0676             vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
0677         if (!count)
0678             break;
0679         xx = 0;
0680         yy++;
0681         if (vc->vc_sw->con_getxy) {
0682             p = (u16 *)start;
0683             start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
0684         }
0685     }
0686 }
0687 
0688 void update_region(struct vc_data *vc, unsigned long start, int count)
0689 {
0690     WARN_CONSOLE_UNLOCKED();
0691 
0692     if (con_should_update(vc)) {
0693         hide_cursor(vc);
0694         do_update_region(vc, start, count);
0695         set_cursor(vc);
0696     }
0697 }
0698 
0699 /* Structure of attributes is hardware-dependent */
0700 
0701 static u8 build_attr(struct vc_data *vc, u8 _color,
0702         enum vc_intensity _intensity, bool _blink, bool _underline,
0703         bool _reverse, bool _italic)
0704 {
0705     if (vc->vc_sw->con_build_attr)
0706         return vc->vc_sw->con_build_attr(vc, _color, _intensity,
0707                _blink, _underline, _reverse, _italic);
0708 
0709 /*
0710  * ++roman: I completely changed the attribute format for monochrome
0711  * mode (!can_do_color). The formerly used MDA (monochrome display
0712  * adapter) format didn't allow the combination of certain effects.
0713  * Now the attribute is just a bit vector:
0714  *  Bit 0..1: intensity (0..2)
0715  *  Bit 2   : underline
0716  *  Bit 3   : reverse
0717  *  Bit 7   : blink
0718  */
0719     {
0720     u8 a = _color;
0721     if (!vc->vc_can_do_color)
0722         return _intensity |
0723                (_italic    << 1) |
0724                (_underline << 2) |
0725                (_reverse   << 3) |
0726                (_blink     << 7);
0727     if (_italic)
0728         a = (a & 0xF0) | vc->vc_itcolor;
0729     else if (_underline)
0730         a = (a & 0xf0) | vc->vc_ulcolor;
0731     else if (_intensity == VCI_HALF_BRIGHT)
0732         a = (a & 0xf0) | vc->vc_halfcolor;
0733     if (_reverse)
0734         a = (a & 0x88) | (((a >> 4) | (a << 4)) & 0x77);
0735     if (_blink)
0736         a ^= 0x80;
0737     if (_intensity == VCI_BOLD)
0738         a ^= 0x08;
0739     if (vc->vc_hi_font_mask == 0x100)
0740         a <<= 1;
0741     return a;
0742     }
0743 }
0744 
0745 static void update_attr(struct vc_data *vc)
0746 {
0747     vc->vc_attr = build_attr(vc, vc->state.color, vc->state.intensity,
0748                   vc->state.blink, vc->state.underline,
0749                   vc->state.reverse ^ vc->vc_decscnm, vc->state.italic);
0750     vc->vc_video_erase_char = ' ' | (build_attr(vc, vc->state.color,
0751                 VCI_NORMAL, vc->state.blink, false,
0752                 vc->vc_decscnm, false) << 8);
0753 }
0754 
0755 /* Note: inverting the screen twice should revert to the original state */
0756 void invert_screen(struct vc_data *vc, int offset, int count, bool viewed)
0757 {
0758     unsigned short *p;
0759 
0760     WARN_CONSOLE_UNLOCKED();
0761 
0762     count /= 2;
0763     p = screenpos(vc, offset, viewed);
0764     if (vc->vc_sw->con_invert_region) {
0765         vc->vc_sw->con_invert_region(vc, p, count);
0766     } else {
0767         u16 *q = p;
0768         int cnt = count;
0769         u16 a;
0770 
0771         if (!vc->vc_can_do_color) {
0772             while (cnt--) {
0773                 a = scr_readw(q);
0774                 a ^= 0x0800;
0775                 scr_writew(a, q);
0776                 q++;
0777             }
0778         } else if (vc->vc_hi_font_mask == 0x100) {
0779             while (cnt--) {
0780                 a = scr_readw(q);
0781                 a = (a & 0x11ff) |
0782                    ((a & 0xe000) >> 4) |
0783                    ((a & 0x0e00) << 4);
0784                 scr_writew(a, q);
0785                 q++;
0786             }
0787         } else {
0788             while (cnt--) {
0789                 a = scr_readw(q);
0790                 a = (a & 0x88ff) |
0791                    ((a & 0x7000) >> 4) |
0792                    ((a & 0x0700) << 4);
0793                 scr_writew(a, q);
0794                 q++;
0795             }
0796         }
0797     }
0798 
0799     if (con_should_update(vc))
0800         do_update_region(vc, (unsigned long) p, count);
0801     notify_update(vc);
0802 }
0803 
0804 /* used by selection: complement pointer position */
0805 void complement_pos(struct vc_data *vc, int offset)
0806 {
0807     static int old_offset = -1;
0808     static unsigned short old;
0809     static unsigned short oldx, oldy;
0810 
0811     WARN_CONSOLE_UNLOCKED();
0812 
0813     if (old_offset != -1 && old_offset >= 0 &&
0814         old_offset < vc->vc_screenbuf_size) {
0815         scr_writew(old, screenpos(vc, old_offset, true));
0816         if (con_should_update(vc))
0817             vc->vc_sw->con_putc(vc, old, oldy, oldx);
0818         notify_update(vc);
0819     }
0820 
0821     old_offset = offset;
0822 
0823     if (offset != -1 && offset >= 0 &&
0824         offset < vc->vc_screenbuf_size) {
0825         unsigned short new;
0826         unsigned short *p;
0827         p = screenpos(vc, offset, true);
0828         old = scr_readw(p);
0829         new = old ^ vc->vc_complement_mask;
0830         scr_writew(new, p);
0831         if (con_should_update(vc)) {
0832             oldx = (offset >> 1) % vc->vc_cols;
0833             oldy = (offset >> 1) / vc->vc_cols;
0834             vc->vc_sw->con_putc(vc, new, oldy, oldx);
0835         }
0836         notify_update(vc);
0837     }
0838 }
0839 
0840 static void insert_char(struct vc_data *vc, unsigned int nr)
0841 {
0842     unsigned short *p = (unsigned short *) vc->vc_pos;
0843 
0844     vc_uniscr_insert(vc, nr);
0845     scr_memmovew(p + nr, p, (vc->vc_cols - vc->state.x - nr) * 2);
0846     scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
0847     vc->vc_need_wrap = 0;
0848     if (con_should_update(vc))
0849         do_update_region(vc, (unsigned long) p,
0850             vc->vc_cols - vc->state.x);
0851 }
0852 
0853 static void delete_char(struct vc_data *vc, unsigned int nr)
0854 {
0855     unsigned short *p = (unsigned short *) vc->vc_pos;
0856 
0857     vc_uniscr_delete(vc, nr);
0858     scr_memmovew(p, p + nr, (vc->vc_cols - vc->state.x - nr) * 2);
0859     scr_memsetw(p + vc->vc_cols - vc->state.x - nr, vc->vc_video_erase_char,
0860             nr * 2);
0861     vc->vc_need_wrap = 0;
0862     if (con_should_update(vc))
0863         do_update_region(vc, (unsigned long) p,
0864             vc->vc_cols - vc->state.x);
0865 }
0866 
0867 static int softcursor_original = -1;
0868 
0869 static void add_softcursor(struct vc_data *vc)
0870 {
0871     int i = scr_readw((u16 *) vc->vc_pos);
0872     u32 type = vc->vc_cursor_type;
0873 
0874     if (!(type & CUR_SW))
0875         return;
0876     if (softcursor_original != -1)
0877         return;
0878     softcursor_original = i;
0879     i |= CUR_SET(type);
0880     i ^= CUR_CHANGE(type);
0881     if ((type & CUR_ALWAYS_BG) &&
0882             (softcursor_original & CUR_BG) == (i & CUR_BG))
0883         i ^= CUR_BG;
0884     if ((type & CUR_INVERT_FG_BG) && (i & CUR_FG) == ((i & CUR_BG) >> 4))
0885         i ^= CUR_FG;
0886     scr_writew(i, (u16 *)vc->vc_pos);
0887     if (con_should_update(vc))
0888         vc->vc_sw->con_putc(vc, i, vc->state.y, vc->state.x);
0889 }
0890 
0891 static void hide_softcursor(struct vc_data *vc)
0892 {
0893     if (softcursor_original != -1) {
0894         scr_writew(softcursor_original, (u16 *)vc->vc_pos);
0895         if (con_should_update(vc))
0896             vc->vc_sw->con_putc(vc, softcursor_original,
0897                     vc->state.y, vc->state.x);
0898         softcursor_original = -1;
0899     }
0900 }
0901 
0902 static void hide_cursor(struct vc_data *vc)
0903 {
0904     if (vc_is_sel(vc))
0905         clear_selection();
0906 
0907     vc->vc_sw->con_cursor(vc, CM_ERASE);
0908     hide_softcursor(vc);
0909 }
0910 
0911 static void set_cursor(struct vc_data *vc)
0912 {
0913     if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
0914         return;
0915     if (vc->vc_deccm) {
0916         if (vc_is_sel(vc))
0917             clear_selection();
0918         add_softcursor(vc);
0919         if (CUR_SIZE(vc->vc_cursor_type) != CUR_NONE)
0920             vc->vc_sw->con_cursor(vc, CM_DRAW);
0921     } else
0922         hide_cursor(vc);
0923 }
0924 
0925 static void set_origin(struct vc_data *vc)
0926 {
0927     WARN_CONSOLE_UNLOCKED();
0928 
0929     if (!con_is_visible(vc) ||
0930         !vc->vc_sw->con_set_origin ||
0931         !vc->vc_sw->con_set_origin(vc))
0932         vc->vc_origin = (unsigned long)vc->vc_screenbuf;
0933     vc->vc_visible_origin = vc->vc_origin;
0934     vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
0935     vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->state.y +
0936         2 * vc->state.x;
0937 }
0938 
0939 static void save_screen(struct vc_data *vc)
0940 {
0941     WARN_CONSOLE_UNLOCKED();
0942 
0943     if (vc->vc_sw->con_save_screen)
0944         vc->vc_sw->con_save_screen(vc);
0945 }
0946 
0947 static void flush_scrollback(struct vc_data *vc)
0948 {
0949     WARN_CONSOLE_UNLOCKED();
0950 
0951     set_origin(vc);
0952     if (vc->vc_sw->con_flush_scrollback) {
0953         vc->vc_sw->con_flush_scrollback(vc);
0954     } else if (con_is_visible(vc)) {
0955         /*
0956          * When no con_flush_scrollback method is provided then the
0957          * legacy way for flushing the scrollback buffer is to use
0958          * a side effect of the con_switch method. We do it only on
0959          * the foreground console as background consoles have no
0960          * scrollback buffers in that case and we obviously don't
0961          * want to switch to them.
0962          */
0963         hide_cursor(vc);
0964         vc->vc_sw->con_switch(vc);
0965         set_cursor(vc);
0966     }
0967 }
0968 
0969 /*
0970  *  Redrawing of screen
0971  */
0972 
0973 void clear_buffer_attributes(struct vc_data *vc)
0974 {
0975     unsigned short *p = (unsigned short *)vc->vc_origin;
0976     int count = vc->vc_screenbuf_size / 2;
0977     int mask = vc->vc_hi_font_mask | 0xff;
0978 
0979     for (; count > 0; count--, p++) {
0980         scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
0981     }
0982 }
0983 
0984 void redraw_screen(struct vc_data *vc, int is_switch)
0985 {
0986     int redraw = 0;
0987 
0988     WARN_CONSOLE_UNLOCKED();
0989 
0990     if (!vc) {
0991         /* strange ... */
0992         /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
0993         return;
0994     }
0995 
0996     if (is_switch) {
0997         struct vc_data *old_vc = vc_cons[fg_console].d;
0998         if (old_vc == vc)
0999             return;
1000         if (!con_is_visible(vc))
1001             redraw = 1;
1002         *vc->vc_display_fg = vc;
1003         fg_console = vc->vc_num;
1004         hide_cursor(old_vc);
1005         if (!con_is_visible(old_vc)) {
1006             save_screen(old_vc);
1007             set_origin(old_vc);
1008         }
1009         if (tty0dev)
1010             sysfs_notify(&tty0dev->kobj, NULL, "active");
1011     } else {
1012         hide_cursor(vc);
1013         redraw = 1;
1014     }
1015 
1016     if (redraw) {
1017         int update;
1018         int old_was_color = vc->vc_can_do_color;
1019 
1020         set_origin(vc);
1021         update = vc->vc_sw->con_switch(vc);
1022         set_palette(vc);
1023         /*
1024          * If console changed from mono<->color, the best we can do
1025          * is to clear the buffer attributes. As it currently stands,
1026          * rebuilding new attributes from the old buffer is not doable
1027          * without overly complex code.
1028          */
1029         if (old_was_color != vc->vc_can_do_color) {
1030             update_attr(vc);
1031             clear_buffer_attributes(vc);
1032         }
1033 
1034         if (update && vc->vc_mode != KD_GRAPHICS)
1035             do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1036     }
1037     set_cursor(vc);
1038     if (is_switch) {
1039         vt_set_leds_compute_shiftstate();
1040         notify_update(vc);
1041     }
1042 }
1043 
1044 /*
1045  *  Allocation, freeing and resizing of VTs.
1046  */
1047 
1048 int vc_cons_allocated(unsigned int i)
1049 {
1050     return (i < MAX_NR_CONSOLES && vc_cons[i].d);
1051 }
1052 
1053 static void visual_init(struct vc_data *vc, int num, int init)
1054 {
1055     /* ++Geert: vc->vc_sw->con_init determines console size */
1056     if (vc->vc_sw)
1057         module_put(vc->vc_sw->owner);
1058     vc->vc_sw = conswitchp;
1059 #ifndef VT_SINGLE_DRIVER
1060     if (con_driver_map[num])
1061         vc->vc_sw = con_driver_map[num];
1062 #endif
1063     __module_get(vc->vc_sw->owner);
1064     vc->vc_num = num;
1065     vc->vc_display_fg = &master_display_fg;
1066     if (vc->uni_pagedict_loc)
1067         con_free_unimap(vc);
1068     vc->uni_pagedict_loc = &vc->uni_pagedict;
1069     vc->uni_pagedict = NULL;
1070     vc->vc_hi_font_mask = 0;
1071     vc->vc_complement_mask = 0;
1072     vc->vc_can_do_color = 0;
1073     vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1074     vc->vc_sw->con_init(vc, init);
1075     if (!vc->vc_complement_mask)
1076         vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1077     vc->vc_s_complement_mask = vc->vc_complement_mask;
1078     vc->vc_size_row = vc->vc_cols << 1;
1079     vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1080 }
1081 
1082 
1083 static void visual_deinit(struct vc_data *vc)
1084 {
1085     vc->vc_sw->con_deinit(vc);
1086     module_put(vc->vc_sw->owner);
1087 }
1088 
1089 static void vc_port_destruct(struct tty_port *port)
1090 {
1091     struct vc_data *vc = container_of(port, struct vc_data, port);
1092 
1093     kfree(vc);
1094 }
1095 
1096 static const struct tty_port_operations vc_port_ops = {
1097     .destruct = vc_port_destruct,
1098 };
1099 
1100 /*
1101  * Change # of rows and columns (0 means unchanged/the size of fg_console)
1102  * [this is to be used together with some user program
1103  * like resize that changes the hardware videomode]
1104  */
1105 #define VC_MAXCOL (32767)
1106 #define VC_MAXROW (32767)
1107 
1108 int vc_allocate(unsigned int currcons)  /* return 0 on success */
1109 {
1110     struct vt_notifier_param param;
1111     struct vc_data *vc;
1112     int err;
1113 
1114     WARN_CONSOLE_UNLOCKED();
1115 
1116     if (currcons >= MAX_NR_CONSOLES)
1117         return -ENXIO;
1118 
1119     if (vc_cons[currcons].d)
1120         return 0;
1121 
1122     /* due to the granularity of kmalloc, we waste some memory here */
1123     /* the alloc is done in two steps, to optimize the common situation
1124        of a 25x80 console (structsize=216, screenbuf_size=4000) */
1125     /* although the numbers above are not valid since long ago, the
1126        point is still up-to-date and the comment still has its value
1127        even if only as a historical artifact.  --mj, July 1998 */
1128     param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1129     if (!vc)
1130         return -ENOMEM;
1131 
1132     vc_cons[currcons].d = vc;
1133     tty_port_init(&vc->port);
1134     vc->port.ops = &vc_port_ops;
1135     INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1136 
1137     visual_init(vc, currcons, 1);
1138 
1139     if (!*vc->uni_pagedict_loc)
1140         con_set_default_unimap(vc);
1141 
1142     err = -EINVAL;
1143     if (vc->vc_cols > VC_MAXCOL || vc->vc_rows > VC_MAXROW ||
1144         vc->vc_screenbuf_size > KMALLOC_MAX_SIZE || !vc->vc_screenbuf_size)
1145         goto err_free;
1146     err = -ENOMEM;
1147     vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1148     if (!vc->vc_screenbuf)
1149         goto err_free;
1150 
1151     /* If no drivers have overridden us and the user didn't pass a
1152        boot option, default to displaying the cursor */
1153     if (global_cursor_default == -1)
1154         global_cursor_default = 1;
1155 
1156     vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
1157     vcs_make_sysfs(currcons);
1158     atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
1159 
1160     return 0;
1161 err_free:
1162     visual_deinit(vc);
1163     kfree(vc);
1164     vc_cons[currcons].d = NULL;
1165     return err;
1166 }
1167 
1168 static inline int resize_screen(struct vc_data *vc, int width, int height,
1169                 int user)
1170 {
1171     /* Resizes the resolution of the display adapater */
1172     int err = 0;
1173 
1174     if (vc->vc_sw->con_resize)
1175         err = vc->vc_sw->con_resize(vc, width, height, user);
1176 
1177     return err;
1178 }
1179 
1180 /**
1181  *  vc_do_resize    -   resizing method for the tty
1182  *  @tty: tty being resized
1183  *  @vc: virtual console private data
1184  *  @cols: columns
1185  *  @lines: lines
1186  *
1187  *  Resize a virtual console, clipping according to the actual constraints.
1188  *  If the caller passes a tty structure then update the termios winsize
1189  *  information and perform any necessary signal handling.
1190  *
1191  *  Caller must hold the console semaphore. Takes the termios rwsem and
1192  *  ctrl.lock of the tty IFF a tty is passed.
1193  */
1194 
1195 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1196                 unsigned int cols, unsigned int lines)
1197 {
1198     unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
1199     unsigned long end;
1200     unsigned int old_rows, old_row_size, first_copied_row;
1201     unsigned int new_cols, new_rows, new_row_size, new_screen_size;
1202     unsigned int user;
1203     unsigned short *oldscreen, *newscreen;
1204     struct uni_screen *new_uniscr = NULL;
1205 
1206     WARN_CONSOLE_UNLOCKED();
1207 
1208     if (!vc)
1209         return -ENXIO;
1210 
1211     user = vc->vc_resize_user;
1212     vc->vc_resize_user = 0;
1213 
1214     if (cols > VC_MAXCOL || lines > VC_MAXROW)
1215         return -EINVAL;
1216 
1217     new_cols = (cols ? cols : vc->vc_cols);
1218     new_rows = (lines ? lines : vc->vc_rows);
1219     new_row_size = new_cols << 1;
1220     new_screen_size = new_row_size * new_rows;
1221 
1222     if (new_cols == vc->vc_cols && new_rows == vc->vc_rows) {
1223         /*
1224          * This function is being called here to cover the case
1225          * where the userspace calls the FBIOPUT_VSCREENINFO twice,
1226          * passing the same fb_var_screeninfo containing the fields
1227          * yres/xres equal to a number non-multiple of vc_font.height
1228          * and yres_virtual/xres_virtual equal to number lesser than the
1229          * vc_font.height and yres/xres.
1230          * In the second call, the struct fb_var_screeninfo isn't
1231          * being modified by the underlying driver because of the
1232          * if above, and this causes the fbcon_display->vrows to become
1233          * negative and it eventually leads to out-of-bound
1234          * access by the imageblit function.
1235          * To give the correct values to the struct and to not have
1236          * to deal with possible errors from the code below, we call
1237          * the resize_screen here as well.
1238          */
1239         return resize_screen(vc, new_cols, new_rows, user);
1240     }
1241 
1242     if (new_screen_size > KMALLOC_MAX_SIZE || !new_screen_size)
1243         return -EINVAL;
1244     newscreen = kzalloc(new_screen_size, GFP_USER);
1245     if (!newscreen)
1246         return -ENOMEM;
1247 
1248     if (get_vc_uniscr(vc)) {
1249         new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1250         if (!new_uniscr) {
1251             kfree(newscreen);
1252             return -ENOMEM;
1253         }
1254     }
1255 
1256     if (vc_is_sel(vc))
1257         clear_selection();
1258 
1259     old_rows = vc->vc_rows;
1260     old_row_size = vc->vc_size_row;
1261 
1262     err = resize_screen(vc, new_cols, new_rows, user);
1263     if (err) {
1264         kfree(newscreen);
1265         vc_uniscr_free(new_uniscr);
1266         return err;
1267     }
1268 
1269     vc->vc_rows = new_rows;
1270     vc->vc_cols = new_cols;
1271     vc->vc_size_row = new_row_size;
1272     vc->vc_screenbuf_size = new_screen_size;
1273 
1274     rlth = min(old_row_size, new_row_size);
1275     rrem = new_row_size - rlth;
1276     old_origin = vc->vc_origin;
1277     new_origin = (long) newscreen;
1278     new_scr_end = new_origin + new_screen_size;
1279 
1280     if (vc->state.y > new_rows) {
1281         if (old_rows - vc->state.y < new_rows) {
1282             /*
1283              * Cursor near the bottom, copy contents from the
1284              * bottom of buffer
1285              */
1286             first_copied_row = (old_rows - new_rows);
1287         } else {
1288             /*
1289              * Cursor is in no man's land, copy 1/2 screenful
1290              * from the top and bottom of cursor position
1291              */
1292             first_copied_row = (vc->state.y - new_rows/2);
1293         }
1294         old_origin += first_copied_row * old_row_size;
1295     } else
1296         first_copied_row = 0;
1297     end = old_origin + old_row_size * min(old_rows, new_rows);
1298 
1299     vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
1300                 get_vc_uniscr(vc), rlth/2, first_copied_row,
1301                 min(old_rows, new_rows));
1302     vc_uniscr_set(vc, new_uniscr);
1303 
1304     update_attr(vc);
1305 
1306     while (old_origin < end) {
1307         scr_memcpyw((unsigned short *) new_origin,
1308                 (unsigned short *) old_origin, rlth);
1309         if (rrem)
1310             scr_memsetw((void *)(new_origin + rlth),
1311                     vc->vc_video_erase_char, rrem);
1312         old_origin += old_row_size;
1313         new_origin += new_row_size;
1314     }
1315     if (new_scr_end > new_origin)
1316         scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1317                 new_scr_end - new_origin);
1318     oldscreen = vc->vc_screenbuf;
1319     vc->vc_screenbuf = newscreen;
1320     vc->vc_screenbuf_size = new_screen_size;
1321     set_origin(vc);
1322     kfree(oldscreen);
1323 
1324     /* do part of a reset_terminal() */
1325     vc->vc_top = 0;
1326     vc->vc_bottom = vc->vc_rows;
1327     gotoxy(vc, vc->state.x, vc->state.y);
1328     save_cur(vc);
1329 
1330     if (tty) {
1331         /* Rewrite the requested winsize data with the actual
1332            resulting sizes */
1333         struct winsize ws;
1334         memset(&ws, 0, sizeof(ws));
1335         ws.ws_row = vc->vc_rows;
1336         ws.ws_col = vc->vc_cols;
1337         ws.ws_ypixel = vc->vc_scan_lines;
1338         tty_do_resize(tty, &ws);
1339     }
1340 
1341     if (con_is_visible(vc))
1342         update_screen(vc);
1343     vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1344     notify_update(vc);
1345     return err;
1346 }
1347 
1348 /**
1349  *  vc_resize       -   resize a VT
1350  *  @vc: virtual console
1351  *  @cols: columns
1352  *  @rows: rows
1353  *
1354  *  Resize a virtual console as seen from the console end of things. We
1355  *  use the common vc_do_resize methods to update the structures. The
1356  *  caller must hold the console sem to protect console internals and
1357  *  vc->port.tty
1358  */
1359 
1360 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1361 {
1362     return vc_do_resize(vc->port.tty, vc, cols, rows);
1363 }
1364 
1365 /**
1366  *  vt_resize       -   resize a VT
1367  *  @tty: tty to resize
1368  *  @ws: winsize attributes
1369  *
1370  *  Resize a virtual terminal. This is called by the tty layer as we
1371  *  register our own handler for resizing. The mutual helper does all
1372  *  the actual work.
1373  *
1374  *  Takes the console sem and the called methods then take the tty
1375  *  termios_rwsem and the tty ctrl.lock in that order.
1376  */
1377 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1378 {
1379     struct vc_data *vc = tty->driver_data;
1380     int ret;
1381 
1382     console_lock();
1383     ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1384     console_unlock();
1385     return ret;
1386 }
1387 
1388 struct vc_data *vc_deallocate(unsigned int currcons)
1389 {
1390     struct vc_data *vc = NULL;
1391 
1392     WARN_CONSOLE_UNLOCKED();
1393 
1394     if (vc_cons_allocated(currcons)) {
1395         struct vt_notifier_param param;
1396 
1397         param.vc = vc = vc_cons[currcons].d;
1398         atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1399         vcs_remove_sysfs(currcons);
1400         visual_deinit(vc);
1401         con_free_unimap(vc);
1402         put_pid(vc->vt_pid);
1403         vc_uniscr_set(vc, NULL);
1404         kfree(vc->vc_screenbuf);
1405         vc_cons[currcons].d = NULL;
1406     }
1407     return vc;
1408 }
1409 
1410 /*
1411  *  VT102 emulator
1412  */
1413 
1414 enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1415 
1416 #define set_kbd(vc, x)  vt_set_kbd_mode_bit((vc)->vc_num, (x))
1417 #define clr_kbd(vc, x)  vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1418 #define is_kbd(vc, x)   vt_get_kbd_mode_bit((vc)->vc_num, (x))
1419 
1420 #define decarm      VC_REPEAT
1421 #define decckm      VC_CKMODE
1422 #define kbdapplic   VC_APPLIC
1423 #define lnm     VC_CRLF
1424 
1425 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1426                        8,12,10,14, 9,13,11,15 };
1427 
1428 /* the default colour table, for VGA+ colour systems */
1429 unsigned char default_red[] = {
1430     0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1431     0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1432 };
1433 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1434 
1435 unsigned char default_grn[] = {
1436     0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1437     0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1438 };
1439 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1440 
1441 unsigned char default_blu[] = {
1442     0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1443     0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1444 };
1445 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1446 
1447 /*
1448  * gotoxy() must verify all boundaries, because the arguments
1449  * might also be negative. If the given position is out of
1450  * bounds, the cursor is placed at the nearest margin.
1451  */
1452 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1453 {
1454     int min_y, max_y;
1455 
1456     if (new_x < 0)
1457         vc->state.x = 0;
1458     else {
1459         if (new_x >= vc->vc_cols)
1460             vc->state.x = vc->vc_cols - 1;
1461         else
1462             vc->state.x = new_x;
1463     }
1464 
1465     if (vc->vc_decom) {
1466         min_y = vc->vc_top;
1467         max_y = vc->vc_bottom;
1468     } else {
1469         min_y = 0;
1470         max_y = vc->vc_rows;
1471     }
1472     if (new_y < min_y)
1473         vc->state.y = min_y;
1474     else if (new_y >= max_y)
1475         vc->state.y = max_y - 1;
1476     else
1477         vc->state.y = new_y;
1478     vc->vc_pos = vc->vc_origin + vc->state.y * vc->vc_size_row +
1479         (vc->state.x << 1);
1480     vc->vc_need_wrap = 0;
1481 }
1482 
1483 /* for absolute user moves, when decom is set */
1484 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1485 {
1486     gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1487 }
1488 
1489 void scrollback(struct vc_data *vc)
1490 {
1491     scrolldelta(-(vc->vc_rows / 2));
1492 }
1493 
1494 void scrollfront(struct vc_data *vc, int lines)
1495 {
1496     if (!lines)
1497         lines = vc->vc_rows / 2;
1498     scrolldelta(lines);
1499 }
1500 
1501 static void lf(struct vc_data *vc)
1502 {
1503         /* don't scroll if above bottom of scrolling region, or
1504      * if below scrolling region
1505      */
1506     if (vc->state.y + 1 == vc->vc_bottom)
1507         con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1508     else if (vc->state.y < vc->vc_rows - 1) {
1509         vc->state.y++;
1510         vc->vc_pos += vc->vc_size_row;
1511     }
1512     vc->vc_need_wrap = 0;
1513     notify_write(vc, '\n');
1514 }
1515 
1516 static void ri(struct vc_data *vc)
1517 {
1518         /* don't scroll if below top of scrolling region, or
1519      * if above scrolling region
1520      */
1521     if (vc->state.y == vc->vc_top)
1522         con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1523     else if (vc->state.y > 0) {
1524         vc->state.y--;
1525         vc->vc_pos -= vc->vc_size_row;
1526     }
1527     vc->vc_need_wrap = 0;
1528 }
1529 
1530 static inline void cr(struct vc_data *vc)
1531 {
1532     vc->vc_pos -= vc->state.x << 1;
1533     vc->vc_need_wrap = vc->state.x = 0;
1534     notify_write(vc, '\r');
1535 }
1536 
1537 static inline void bs(struct vc_data *vc)
1538 {
1539     if (vc->state.x) {
1540         vc->vc_pos -= 2;
1541         vc->state.x--;
1542         vc->vc_need_wrap = 0;
1543         notify_write(vc, '\b');
1544     }
1545 }
1546 
1547 static inline void del(struct vc_data *vc)
1548 {
1549     /* ignored */
1550 }
1551 
1552 static void csi_J(struct vc_data *vc, int vpar)
1553 {
1554     unsigned int count;
1555     unsigned short * start;
1556 
1557     switch (vpar) {
1558         case 0: /* erase from cursor to end of display */
1559             vc_uniscr_clear_line(vc, vc->state.x,
1560                          vc->vc_cols - vc->state.x);
1561             vc_uniscr_clear_lines(vc, vc->state.y + 1,
1562                           vc->vc_rows - vc->state.y - 1);
1563             count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1564             start = (unsigned short *)vc->vc_pos;
1565             break;
1566         case 1: /* erase from start to cursor */
1567             vc_uniscr_clear_line(vc, 0, vc->state.x + 1);
1568             vc_uniscr_clear_lines(vc, 0, vc->state.y);
1569             count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1570             start = (unsigned short *)vc->vc_origin;
1571             break;
1572         case 3: /* include scrollback */
1573             flush_scrollback(vc);
1574             fallthrough;
1575         case 2: /* erase whole display */
1576             vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1577             count = vc->vc_cols * vc->vc_rows;
1578             start = (unsigned short *)vc->vc_origin;
1579             break;
1580         default:
1581             return;
1582     }
1583     scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1584     if (con_should_update(vc))
1585         do_update_region(vc, (unsigned long) start, count);
1586     vc->vc_need_wrap = 0;
1587 }
1588 
1589 static void csi_K(struct vc_data *vc, int vpar)
1590 {
1591     unsigned int count;
1592     unsigned short *start = (unsigned short *)vc->vc_pos;
1593     int offset;
1594 
1595     switch (vpar) {
1596         case 0: /* erase from cursor to end of line */
1597             offset = 0;
1598             count = vc->vc_cols - vc->state.x;
1599             break;
1600         case 1: /* erase from start of line to cursor */
1601             offset = -vc->state.x;
1602             count = vc->state.x + 1;
1603             break;
1604         case 2: /* erase whole line */
1605             offset = -vc->state.x;
1606             count = vc->vc_cols;
1607             break;
1608         default:
1609             return;
1610     }
1611     vc_uniscr_clear_line(vc, vc->state.x + offset, count);
1612     scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1613     vc->vc_need_wrap = 0;
1614     if (con_should_update(vc))
1615         do_update_region(vc, (unsigned long)(start + offset), count);
1616 }
1617 
1618 /* erase the following vpar positions */
1619 static void csi_X(struct vc_data *vc, unsigned int vpar)
1620 {                     /* not vt100? */
1621     unsigned int count;
1622 
1623     if (!vpar)
1624         vpar++;
1625 
1626     count = min(vpar, vc->vc_cols - vc->state.x);
1627 
1628     vc_uniscr_clear_line(vc, vc->state.x, count);
1629     scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1630     if (con_should_update(vc))
1631         vc->vc_sw->con_clear(vc, vc->state.y, vc->state.x, 1, count);
1632     vc->vc_need_wrap = 0;
1633 }
1634 
1635 static void default_attr(struct vc_data *vc)
1636 {
1637     vc->state.intensity = VCI_NORMAL;
1638     vc->state.italic = false;
1639     vc->state.underline = false;
1640     vc->state.reverse = false;
1641     vc->state.blink = false;
1642     vc->state.color = vc->vc_def_color;
1643 }
1644 
1645 struct rgb { u8 r; u8 g; u8 b; };
1646 
1647 static void rgb_from_256(int i, struct rgb *c)
1648 {
1649     if (i < 8) {            /* Standard colours. */
1650         c->r = i&1 ? 0xaa : 0x00;
1651         c->g = i&2 ? 0xaa : 0x00;
1652         c->b = i&4 ? 0xaa : 0x00;
1653     } else if (i < 16) {
1654         c->r = i&1 ? 0xff : 0x55;
1655         c->g = i&2 ? 0xff : 0x55;
1656         c->b = i&4 ? 0xff : 0x55;
1657     } else if (i < 232) {   /* 6x6x6 colour cube. */
1658         c->r = (i - 16) / 36 * 85 / 2;
1659         c->g = (i - 16) / 6 % 6 * 85 / 2;
1660         c->b = (i - 16) % 6 * 85 / 2;
1661     } else                  /* Grayscale ramp. */
1662         c->r = c->g = c->b = i * 10 - 2312;
1663 }
1664 
1665 static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1666 {
1667     u8 hue = 0, max = max3(c->r, c->g, c->b);
1668 
1669     if (c->r > max / 2)
1670         hue |= 4;
1671     if (c->g > max / 2)
1672         hue |= 2;
1673     if (c->b > max / 2)
1674         hue |= 1;
1675 
1676     if (hue == 7 && max <= 0x55) {
1677         hue = 0;
1678         vc->state.intensity = VCI_BOLD;
1679     } else if (max > 0xaa)
1680         vc->state.intensity = VCI_BOLD;
1681     else
1682         vc->state.intensity = VCI_NORMAL;
1683 
1684     vc->state.color = (vc->state.color & 0xf0) | hue;
1685 }
1686 
1687 static void rgb_background(struct vc_data *vc, const struct rgb *c)
1688 {
1689     /* For backgrounds, err on the dark side. */
1690     vc->state.color = (vc->state.color & 0x0f)
1691         | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1692 }
1693 
1694 /*
1695  * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1696  * and thus need to be detected and ignored by hand. That standard also
1697  * wants : rather than ; as separators but sequences containing : are currently
1698  * completely ignored by the parser.
1699  *
1700  * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1701  * supporting them.
1702  */
1703 static int vc_t416_color(struct vc_data *vc, int i,
1704         void(*set_color)(struct vc_data *vc, const struct rgb *c))
1705 {
1706     struct rgb c;
1707 
1708     i++;
1709     if (i > vc->vc_npar)
1710         return i;
1711 
1712     if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1713         /* 256 colours */
1714         i++;
1715         rgb_from_256(vc->vc_par[i], &c);
1716     } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1717         /* 24 bit */
1718         c.r = vc->vc_par[i + 1];
1719         c.g = vc->vc_par[i + 2];
1720         c.b = vc->vc_par[i + 3];
1721         i += 3;
1722     } else
1723         return i;
1724 
1725     set_color(vc, &c);
1726 
1727     return i;
1728 }
1729 
1730 /* console_lock is held */
1731 static void csi_m(struct vc_data *vc)
1732 {
1733     int i;
1734 
1735     for (i = 0; i <= vc->vc_npar; i++)
1736         switch (vc->vc_par[i]) {
1737         case 0: /* all attributes off */
1738             default_attr(vc);
1739             break;
1740         case 1:
1741             vc->state.intensity = VCI_BOLD;
1742             break;
1743         case 2:
1744             vc->state.intensity = VCI_HALF_BRIGHT;
1745             break;
1746         case 3:
1747             vc->state.italic = true;
1748             break;
1749         case 21:
1750             /*
1751              * No console drivers support double underline, so
1752              * convert it to a single underline.
1753              */
1754         case 4:
1755             vc->state.underline = true;
1756             break;
1757         case 5:
1758             vc->state.blink = true;
1759             break;
1760         case 7:
1761             vc->state.reverse = true;
1762             break;
1763         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1764               * Select primary font, don't display control chars if
1765               * defined, don't set bit 8 on output.
1766               */
1767             vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset], vc);
1768             vc->vc_disp_ctrl = 0;
1769             vc->vc_toggle_meta = 0;
1770             break;
1771         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1772               * Select first alternate font, lets chars < 32 be
1773               * displayed as ROM chars.
1774               */
1775             vc->vc_translate = set_translate(IBMPC_MAP, vc);
1776             vc->vc_disp_ctrl = 1;
1777             vc->vc_toggle_meta = 0;
1778             break;
1779         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1780               * Select second alternate font, toggle high bit
1781               * before displaying as ROM char.
1782               */
1783             vc->vc_translate = set_translate(IBMPC_MAP, vc);
1784             vc->vc_disp_ctrl = 1;
1785             vc->vc_toggle_meta = 1;
1786             break;
1787         case 22:
1788             vc->state.intensity = VCI_NORMAL;
1789             break;
1790         case 23:
1791             vc->state.italic = false;
1792             break;
1793         case 24:
1794             vc->state.underline = false;
1795             break;
1796         case 25:
1797             vc->state.blink = false;
1798             break;
1799         case 27:
1800             vc->state.reverse = false;
1801             break;
1802         case 38:
1803             i = vc_t416_color(vc, i, rgb_foreground);
1804             break;
1805         case 48:
1806             i = vc_t416_color(vc, i, rgb_background);
1807             break;
1808         case 39:
1809             vc->state.color = (vc->vc_def_color & 0x0f) |
1810                 (vc->state.color & 0xf0);
1811             break;
1812         case 49:
1813             vc->state.color = (vc->vc_def_color & 0xf0) |
1814                 (vc->state.color & 0x0f);
1815             break;
1816         default:
1817             if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1818                 if (vc->vc_par[i] < 100)
1819                     vc->state.intensity = VCI_BOLD;
1820                 vc->vc_par[i] -= 60;
1821             }
1822             if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1823                 vc->state.color = color_table[vc->vc_par[i] - 30]
1824                     | (vc->state.color & 0xf0);
1825             else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1826                 vc->state.color = (color_table[vc->vc_par[i] - 40] << 4)
1827                     | (vc->state.color & 0x0f);
1828             break;
1829         }
1830     update_attr(vc);
1831 }
1832 
1833 static void respond_string(const char *p, size_t len, struct tty_port *port)
1834 {
1835     tty_insert_flip_string(port, p, len);
1836     tty_flip_buffer_push(port);
1837 }
1838 
1839 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1840 {
1841     char buf[40];
1842     int len;
1843 
1844     len = sprintf(buf, "\033[%d;%dR", vc->state.y +
1845             (vc->vc_decom ? vc->vc_top + 1 : 1),
1846             vc->state.x + 1);
1847     respond_string(buf, len, tty->port);
1848 }
1849 
1850 static inline void status_report(struct tty_struct *tty)
1851 {
1852     static const char teminal_ok[] = "\033[0n";
1853 
1854     respond_string(teminal_ok, strlen(teminal_ok), tty->port);
1855 }
1856 
1857 static inline void respond_ID(struct tty_struct *tty)
1858 {
1859     /* terminal answer to an ESC-Z or csi0c query. */
1860     static const char vt102_id[] = "\033[?6c";
1861 
1862     respond_string(vt102_id, strlen(vt102_id), tty->port);
1863 }
1864 
1865 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1866 {
1867     char buf[8];
1868     int len;
1869 
1870     len = sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt),
1871             (char)('!' + mrx), (char)('!' + mry));
1872     respond_string(buf, len, tty->port);
1873 }
1874 
1875 /* invoked via ioctl(TIOCLINUX) and through set_selection_user */
1876 int mouse_reporting(void)
1877 {
1878     return vc_cons[fg_console].d->vc_report_mouse;
1879 }
1880 
1881 /* console_lock is held */
1882 static void set_mode(struct vc_data *vc, int on_off)
1883 {
1884     int i;
1885 
1886     for (i = 0; i <= vc->vc_npar; i++)
1887         if (vc->vc_priv == EPdec) {
1888             switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1889             case 1:         /* Cursor keys send ^[Ox/^[[x */
1890                 if (on_off)
1891                     set_kbd(vc, decckm);
1892                 else
1893                     clr_kbd(vc, decckm);
1894                 break;
1895             case 3: /* 80/132 mode switch unimplemented */
1896 #if 0
1897                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1898                 /* this alone does not suffice; some user mode
1899                    utility has to change the hardware regs */
1900 #endif
1901                 break;
1902             case 5:         /* Inverted screen on/off */
1903                 if (vc->vc_decscnm != on_off) {
1904                     vc->vc_decscnm = on_off;
1905                     invert_screen(vc, 0,
1906                             vc->vc_screenbuf_size,
1907                             false);
1908                     update_attr(vc);
1909                 }
1910                 break;
1911             case 6:         /* Origin relative/absolute */
1912                 vc->vc_decom = on_off;
1913                 gotoxay(vc, 0, 0);
1914                 break;
1915             case 7:         /* Autowrap on/off */
1916                 vc->vc_decawm = on_off;
1917                 break;
1918             case 8:         /* Autorepeat on/off */
1919                 if (on_off)
1920                     set_kbd(vc, decarm);
1921                 else
1922                     clr_kbd(vc, decarm);
1923                 break;
1924             case 9:
1925                 vc->vc_report_mouse = on_off ? 1 : 0;
1926                 break;
1927             case 25:        /* Cursor on/off */
1928                 vc->vc_deccm = on_off;
1929                 break;
1930             case 1000:
1931                 vc->vc_report_mouse = on_off ? 2 : 0;
1932                 break;
1933             }
1934         } else {
1935             switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1936             case 3:         /* Monitor (display ctrls) */
1937                 vc->vc_disp_ctrl = on_off;
1938                 break;
1939             case 4:         /* Insert Mode on/off */
1940                 vc->vc_decim = on_off;
1941                 break;
1942             case 20:        /* Lf, Enter == CrLf/Lf */
1943                 if (on_off)
1944                     set_kbd(vc, lnm);
1945                 else
1946                     clr_kbd(vc, lnm);
1947                 break;
1948             }
1949         }
1950 }
1951 
1952 /* console_lock is held */
1953 static void setterm_command(struct vc_data *vc)
1954 {
1955     switch (vc->vc_par[0]) {
1956     case 1: /* set color for underline mode */
1957         if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1958             vc->vc_ulcolor = color_table[vc->vc_par[1]];
1959             if (vc->state.underline)
1960                 update_attr(vc);
1961         }
1962         break;
1963     case 2: /* set color for half intensity mode */
1964         if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
1965             vc->vc_halfcolor = color_table[vc->vc_par[1]];
1966             if (vc->state.intensity == VCI_HALF_BRIGHT)
1967                 update_attr(vc);
1968         }
1969         break;
1970     case 8: /* store colors as defaults */
1971         vc->vc_def_color = vc->vc_attr;
1972         if (vc->vc_hi_font_mask == 0x100)
1973             vc->vc_def_color >>= 1;
1974         default_attr(vc);
1975         update_attr(vc);
1976         break;
1977     case 9: /* set blanking interval */
1978         blankinterval = min(vc->vc_par[1], 60U) * 60;
1979         poke_blanked_console();
1980         break;
1981     case 10: /* set bell frequency in Hz */
1982         if (vc->vc_npar >= 1)
1983             vc->vc_bell_pitch = vc->vc_par[1];
1984         else
1985             vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1986         break;
1987     case 11: /* set bell duration in msec */
1988         if (vc->vc_npar >= 1)
1989             vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1990                 msecs_to_jiffies(vc->vc_par[1]) : 0;
1991         else
1992             vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1993         break;
1994     case 12: /* bring specified console to the front */
1995         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1996             set_console(vc->vc_par[1] - 1);
1997         break;
1998     case 13: /* unblank the screen */
1999         poke_blanked_console();
2000         break;
2001     case 14: /* set vesa powerdown interval */
2002         vesa_off_interval = min(vc->vc_par[1], 60U) * 60 * HZ;
2003         break;
2004     case 15: /* activate the previous console */
2005         set_console(last_console);
2006         break;
2007     case 16: /* set cursor blink duration in msec */
2008         if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
2009                 vc->vc_par[1] <= USHRT_MAX)
2010             vc->vc_cur_blink_ms = vc->vc_par[1];
2011         else
2012             vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2013         break;
2014     }
2015 }
2016 
2017 /* console_lock is held */
2018 static void csi_at(struct vc_data *vc, unsigned int nr)
2019 {
2020     if (nr > vc->vc_cols - vc->state.x)
2021         nr = vc->vc_cols - vc->state.x;
2022     else if (!nr)
2023         nr = 1;
2024     insert_char(vc, nr);
2025 }
2026 
2027 /* console_lock is held */
2028 static void csi_L(struct vc_data *vc, unsigned int nr)
2029 {
2030     if (nr > vc->vc_rows - vc->state.y)
2031         nr = vc->vc_rows - vc->state.y;
2032     else if (!nr)
2033         nr = 1;
2034     con_scroll(vc, vc->state.y, vc->vc_bottom, SM_DOWN, nr);
2035     vc->vc_need_wrap = 0;
2036 }
2037 
2038 /* console_lock is held */
2039 static void csi_P(struct vc_data *vc, unsigned int nr)
2040 {
2041     if (nr > vc->vc_cols - vc->state.x)
2042         nr = vc->vc_cols - vc->state.x;
2043     else if (!nr)
2044         nr = 1;
2045     delete_char(vc, nr);
2046 }
2047 
2048 /* console_lock is held */
2049 static void csi_M(struct vc_data *vc, unsigned int nr)
2050 {
2051     if (nr > vc->vc_rows - vc->state.y)
2052         nr = vc->vc_rows - vc->state.y;
2053     else if (!nr)
2054         nr=1;
2055     con_scroll(vc, vc->state.y, vc->vc_bottom, SM_UP, nr);
2056     vc->vc_need_wrap = 0;
2057 }
2058 
2059 /* console_lock is held (except via vc_init->reset_terminal */
2060 static void save_cur(struct vc_data *vc)
2061 {
2062     memcpy(&vc->saved_state, &vc->state, sizeof(vc->state));
2063 }
2064 
2065 /* console_lock is held */
2066 static void restore_cur(struct vc_data *vc)
2067 {
2068     memcpy(&vc->state, &vc->saved_state, sizeof(vc->state));
2069 
2070     gotoxy(vc, vc->state.x, vc->state.y);
2071     vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset],
2072             vc);
2073     update_attr(vc);
2074     vc->vc_need_wrap = 0;
2075 }
2076 
2077 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
2078     EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd,
2079     ESpalette, ESosc, ESapc, ESpm, ESdcs };
2080 
2081 /* console_lock is held (except via vc_init()) */
2082 static void reset_terminal(struct vc_data *vc, int do_clear)
2083 {
2084     unsigned int i;
2085 
2086     vc->vc_top      = 0;
2087     vc->vc_bottom       = vc->vc_rows;
2088     vc->vc_state        = ESnormal;
2089     vc->vc_priv     = EPecma;
2090     vc->vc_translate    = set_translate(LAT1_MAP, vc);
2091     vc->state.Gx_charset[0] = LAT1_MAP;
2092     vc->state.Gx_charset[1] = GRAF_MAP;
2093     vc->state.charset   = 0;
2094     vc->vc_need_wrap    = 0;
2095     vc->vc_report_mouse = 0;
2096     vc->vc_utf              = default_utf8;
2097     vc->vc_utf_count    = 0;
2098 
2099     vc->vc_disp_ctrl    = 0;
2100     vc->vc_toggle_meta  = 0;
2101 
2102     vc->vc_decscnm      = 0;
2103     vc->vc_decom        = 0;
2104     vc->vc_decawm       = 1;
2105     vc->vc_deccm        = global_cursor_default;
2106     vc->vc_decim        = 0;
2107 
2108     vt_reset_keyboard(vc->vc_num);
2109 
2110     vc->vc_cursor_type = cur_default;
2111     vc->vc_complement_mask = vc->vc_s_complement_mask;
2112 
2113     default_attr(vc);
2114     update_attr(vc);
2115 
2116     bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2117     for (i = 0; i < VC_TABSTOPS_COUNT; i += 8)
2118         set_bit(i, vc->vc_tab_stop);
2119 
2120     vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2121     vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2122     vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2123 
2124     gotoxy(vc, 0, 0);
2125     save_cur(vc);
2126     if (do_clear)
2127         csi_J(vc, 2);
2128 }
2129 
2130 static void vc_setGx(struct vc_data *vc, unsigned int which, int c)
2131 {
2132     unsigned char *charset = &vc->state.Gx_charset[which];
2133 
2134     switch (c) {
2135     case '0':
2136         *charset = GRAF_MAP;
2137         break;
2138     case 'B':
2139         *charset = LAT1_MAP;
2140         break;
2141     case 'U':
2142         *charset = IBMPC_MAP;
2143         break;
2144     case 'K':
2145         *charset = USER_MAP;
2146         break;
2147     }
2148 
2149     if (vc->state.charset == which)
2150         vc->vc_translate = set_translate(*charset, vc);
2151 }
2152 
2153 /* is this state an ANSI control string? */
2154 static bool ansi_control_string(unsigned int state)
2155 {
2156     if (state == ESosc || state == ESapc || state == ESpm || state == ESdcs)
2157         return true;
2158     return false;
2159 }
2160 
2161 /* console_lock is held */
2162 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
2163 {
2164     /*
2165      *  Control characters can be used in the _middle_
2166      *  of an escape sequence, aside from ANSI control strings.
2167      */
2168     if (ansi_control_string(vc->vc_state) && c >= 8 && c <= 13)
2169         return;
2170     switch (c) {
2171     case 0:
2172         return;
2173     case 7:
2174         if (ansi_control_string(vc->vc_state))
2175             vc->vc_state = ESnormal;
2176         else if (vc->vc_bell_duration)
2177             kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2178         return;
2179     case 8:
2180         bs(vc);
2181         return;
2182     case 9:
2183         vc->vc_pos -= (vc->state.x << 1);
2184 
2185         vc->state.x = find_next_bit(vc->vc_tab_stop,
2186                 min(vc->vc_cols - 1, VC_TABSTOPS_COUNT),
2187                 vc->state.x + 1);
2188         if (vc->state.x >= VC_TABSTOPS_COUNT)
2189             vc->state.x = vc->vc_cols - 1;
2190 
2191         vc->vc_pos += (vc->state.x << 1);
2192         notify_write(vc, '\t');
2193         return;
2194     case 10: case 11: case 12:
2195         lf(vc);
2196         if (!is_kbd(vc, lnm))
2197             return;
2198         fallthrough;
2199     case 13:
2200         cr(vc);
2201         return;
2202     case 14:
2203         vc->state.charset = 1;
2204         vc->vc_translate = set_translate(vc->state.Gx_charset[1], vc);
2205         vc->vc_disp_ctrl = 1;
2206         return;
2207     case 15:
2208         vc->state.charset = 0;
2209         vc->vc_translate = set_translate(vc->state.Gx_charset[0], vc);
2210         vc->vc_disp_ctrl = 0;
2211         return;
2212     case 24: case 26:
2213         vc->vc_state = ESnormal;
2214         return;
2215     case 27:
2216         vc->vc_state = ESesc;
2217         return;
2218     case 127:
2219         del(vc);
2220         return;
2221     case 128+27:
2222         vc->vc_state = ESsquare;
2223         return;
2224     }
2225     switch(vc->vc_state) {
2226     case ESesc:
2227         vc->vc_state = ESnormal;
2228         switch (c) {
2229         case '[':
2230             vc->vc_state = ESsquare;
2231             return;
2232         case ']':
2233             vc->vc_state = ESnonstd;
2234             return;
2235         case '_':
2236             vc->vc_state = ESapc;
2237             return;
2238         case '^':
2239             vc->vc_state = ESpm;
2240             return;
2241         case '%':
2242             vc->vc_state = ESpercent;
2243             return;
2244         case 'E':
2245             cr(vc);
2246             lf(vc);
2247             return;
2248         case 'M':
2249             ri(vc);
2250             return;
2251         case 'D':
2252             lf(vc);
2253             return;
2254         case 'H':
2255             if (vc->state.x < VC_TABSTOPS_COUNT)
2256                 set_bit(vc->state.x, vc->vc_tab_stop);
2257             return;
2258         case 'P':
2259             vc->vc_state = ESdcs;
2260             return;
2261         case 'Z':
2262             respond_ID(tty);
2263             return;
2264         case '7':
2265             save_cur(vc);
2266             return;
2267         case '8':
2268             restore_cur(vc);
2269             return;
2270         case '(':
2271             vc->vc_state = ESsetG0;
2272             return;
2273         case ')':
2274             vc->vc_state = ESsetG1;
2275             return;
2276         case '#':
2277             vc->vc_state = EShash;
2278             return;
2279         case 'c':
2280             reset_terminal(vc, 1);
2281             return;
2282         case '>':  /* Numeric keypad */
2283             clr_kbd(vc, kbdapplic);
2284             return;
2285         case '=':  /* Appl. keypad */
2286             set_kbd(vc, kbdapplic);
2287             return;
2288         }
2289         return;
2290     case ESnonstd:
2291         if (c=='P') {   /* palette escape sequence */
2292             for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2293                 vc->vc_par[vc->vc_npar] = 0;
2294             vc->vc_npar = 0;
2295             vc->vc_state = ESpalette;
2296             return;
2297         } else if (c=='R') {   /* reset palette */
2298             reset_palette(vc);
2299             vc->vc_state = ESnormal;
2300         } else if (c>='0' && c<='9')
2301             vc->vc_state = ESosc;
2302         else
2303             vc->vc_state = ESnormal;
2304         return;
2305     case ESpalette:
2306         if (isxdigit(c)) {
2307             vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
2308             if (vc->vc_npar == 7) {
2309                 int i = vc->vc_par[0] * 3, j = 1;
2310                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2311                 vc->vc_palette[i++] += vc->vc_par[j++];
2312                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2313                 vc->vc_palette[i++] += vc->vc_par[j++];
2314                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2315                 vc->vc_palette[i] += vc->vc_par[j];
2316                 set_palette(vc);
2317                 vc->vc_state = ESnormal;
2318             }
2319         } else
2320             vc->vc_state = ESnormal;
2321         return;
2322     case ESsquare:
2323         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2324             vc->vc_par[vc->vc_npar] = 0;
2325         vc->vc_npar = 0;
2326         vc->vc_state = ESgetpars;
2327         if (c == '[') { /* Function key */
2328             vc->vc_state=ESfunckey;
2329             return;
2330         }
2331         switch (c) {
2332         case '?':
2333             vc->vc_priv = EPdec;
2334             return;
2335         case '>':
2336             vc->vc_priv = EPgt;
2337             return;
2338         case '=':
2339             vc->vc_priv = EPeq;
2340             return;
2341         case '<':
2342             vc->vc_priv = EPlt;
2343             return;
2344         }
2345         vc->vc_priv = EPecma;
2346         fallthrough;
2347     case ESgetpars:
2348         if (c == ';' && vc->vc_npar < NPAR - 1) {
2349             vc->vc_npar++;
2350             return;
2351         } else if (c>='0' && c<='9') {
2352             vc->vc_par[vc->vc_npar] *= 10;
2353             vc->vc_par[vc->vc_npar] += c - '0';
2354             return;
2355         }
2356         if (c >= 0x20 && c <= 0x3f) { /* 0x2x, 0x3a and 0x3c - 0x3f */
2357             vc->vc_state = EScsiignore;
2358             return;
2359         }
2360         vc->vc_state = ESnormal;
2361         switch(c) {
2362         case 'h':
2363             if (vc->vc_priv <= EPdec)
2364                 set_mode(vc, 1);
2365             return;
2366         case 'l':
2367             if (vc->vc_priv <= EPdec)
2368                 set_mode(vc, 0);
2369             return;
2370         case 'c':
2371             if (vc->vc_priv == EPdec) {
2372                 if (vc->vc_par[0])
2373                     vc->vc_cursor_type =
2374                         CUR_MAKE(vc->vc_par[0],
2375                              vc->vc_par[1],
2376                              vc->vc_par[2]);
2377                 else
2378                     vc->vc_cursor_type = cur_default;
2379                 return;
2380             }
2381             break;
2382         case 'm':
2383             if (vc->vc_priv == EPdec) {
2384                 clear_selection();
2385                 if (vc->vc_par[0])
2386                     vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2387                 else
2388                     vc->vc_complement_mask = vc->vc_s_complement_mask;
2389                 return;
2390             }
2391             break;
2392         case 'n':
2393             if (vc->vc_priv == EPecma) {
2394                 if (vc->vc_par[0] == 5)
2395                     status_report(tty);
2396                 else if (vc->vc_par[0] == 6)
2397                     cursor_report(vc, tty);
2398             }
2399             return;
2400         }
2401         if (vc->vc_priv != EPecma) {
2402             vc->vc_priv = EPecma;
2403             return;
2404         }
2405         switch(c) {
2406         case 'G': case '`':
2407             if (vc->vc_par[0])
2408                 vc->vc_par[0]--;
2409             gotoxy(vc, vc->vc_par[0], vc->state.y);
2410             return;
2411         case 'A':
2412             if (!vc->vc_par[0])
2413                 vc->vc_par[0]++;
2414             gotoxy(vc, vc->state.x, vc->state.y - vc->vc_par[0]);
2415             return;
2416         case 'B': case 'e':
2417             if (!vc->vc_par[0])
2418                 vc->vc_par[0]++;
2419             gotoxy(vc, vc->state.x, vc->state.y + vc->vc_par[0]);
2420             return;
2421         case 'C': case 'a':
2422             if (!vc->vc_par[0])
2423                 vc->vc_par[0]++;
2424             gotoxy(vc, vc->state.x + vc->vc_par[0], vc->state.y);
2425             return;
2426         case 'D':
2427             if (!vc->vc_par[0])
2428                 vc->vc_par[0]++;
2429             gotoxy(vc, vc->state.x - vc->vc_par[0], vc->state.y);
2430             return;
2431         case 'E':
2432             if (!vc->vc_par[0])
2433                 vc->vc_par[0]++;
2434             gotoxy(vc, 0, vc->state.y + vc->vc_par[0]);
2435             return;
2436         case 'F':
2437             if (!vc->vc_par[0])
2438                 vc->vc_par[0]++;
2439             gotoxy(vc, 0, vc->state.y - vc->vc_par[0]);
2440             return;
2441         case 'd':
2442             if (vc->vc_par[0])
2443                 vc->vc_par[0]--;
2444             gotoxay(vc, vc->state.x ,vc->vc_par[0]);
2445             return;
2446         case 'H': case 'f':
2447             if (vc->vc_par[0])
2448                 vc->vc_par[0]--;
2449             if (vc->vc_par[1])
2450                 vc->vc_par[1]--;
2451             gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2452             return;
2453         case 'J':
2454             csi_J(vc, vc->vc_par[0]);
2455             return;
2456         case 'K':
2457             csi_K(vc, vc->vc_par[0]);
2458             return;
2459         case 'L':
2460             csi_L(vc, vc->vc_par[0]);
2461             return;
2462         case 'M':
2463             csi_M(vc, vc->vc_par[0]);
2464             return;
2465         case 'P':
2466             csi_P(vc, vc->vc_par[0]);
2467             return;
2468         case 'c':
2469             if (!vc->vc_par[0])
2470                 respond_ID(tty);
2471             return;
2472         case 'g':
2473             if (!vc->vc_par[0] && vc->state.x < VC_TABSTOPS_COUNT)
2474                 set_bit(vc->state.x, vc->vc_tab_stop);
2475             else if (vc->vc_par[0] == 3)
2476                 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
2477             return;
2478         case 'm':
2479             csi_m(vc);
2480             return;
2481         case 'q': /* DECLL - but only 3 leds */
2482             /* map 0,1,2,3 to 0,1,2,4 */
2483             if (vc->vc_par[0] < 4)
2484                 vt_set_led_state(vc->vc_num,
2485                         (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2486             return;
2487         case 'r':
2488             if (!vc->vc_par[0])
2489                 vc->vc_par[0]++;
2490             if (!vc->vc_par[1])
2491                 vc->vc_par[1] = vc->vc_rows;
2492             /* Minimum allowed region is 2 lines */
2493             if (vc->vc_par[0] < vc->vc_par[1] &&
2494                 vc->vc_par[1] <= vc->vc_rows) {
2495                 vc->vc_top = vc->vc_par[0] - 1;
2496                 vc->vc_bottom = vc->vc_par[1];
2497                 gotoxay(vc, 0, 0);
2498             }
2499             return;
2500         case 's':
2501             save_cur(vc);
2502             return;
2503         case 'u':
2504             restore_cur(vc);
2505             return;
2506         case 'X':
2507             csi_X(vc, vc->vc_par[0]);
2508             return;
2509         case '@':
2510             csi_at(vc, vc->vc_par[0]);
2511             return;
2512         case ']': /* setterm functions */
2513             setterm_command(vc);
2514             return;
2515         }
2516         return;
2517     case EScsiignore:
2518         if (c >= 20 && c <= 0x3f)
2519             return;
2520         vc->vc_state = ESnormal;
2521         return;
2522     case ESpercent:
2523         vc->vc_state = ESnormal;
2524         switch (c) {
2525         case '@':  /* defined in ISO 2022 */
2526             vc->vc_utf = 0;
2527             return;
2528         case 'G':  /* prelim official escape code */
2529         case '8':  /* retained for compatibility */
2530             vc->vc_utf = 1;
2531             return;
2532         }
2533         return;
2534     case ESfunckey:
2535         vc->vc_state = ESnormal;
2536         return;
2537     case EShash:
2538         vc->vc_state = ESnormal;
2539         if (c == '8') {
2540             /* DEC screen alignment test. kludge :-) */
2541             vc->vc_video_erase_char =
2542                 (vc->vc_video_erase_char & 0xff00) | 'E';
2543             csi_J(vc, 2);
2544             vc->vc_video_erase_char =
2545                 (vc->vc_video_erase_char & 0xff00) | ' ';
2546             do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2547         }
2548         return;
2549     case ESsetG0:
2550         vc_setGx(vc, 0, c);
2551         vc->vc_state = ESnormal;
2552         return;
2553     case ESsetG1:
2554         vc_setGx(vc, 1, c);
2555         vc->vc_state = ESnormal;
2556         return;
2557     case ESapc:
2558         return;
2559     case ESosc:
2560         return;
2561     case ESpm:
2562         return;
2563     case ESdcs:
2564         return;
2565     default:
2566         vc->vc_state = ESnormal;
2567     }
2568 }
2569 
2570 /* is_double_width() is based on the wcwidth() implementation by
2571  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2572  * Latest version: https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2573  */
2574 struct interval {
2575     uint32_t first;
2576     uint32_t last;
2577 };
2578 
2579 static int ucs_cmp(const void *key, const void *elt)
2580 {
2581     uint32_t ucs = *(uint32_t *)key;
2582     struct interval e = *(struct interval *) elt;
2583 
2584     if (ucs > e.last)
2585         return 1;
2586     else if (ucs < e.first)
2587         return -1;
2588     return 0;
2589 }
2590 
2591 static int is_double_width(uint32_t ucs)
2592 {
2593     static const struct interval double_width[] = {
2594         { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2595         { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2596         { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2597         { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2598     };
2599     if (ucs < double_width[0].first ||
2600         ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2601         return 0;
2602 
2603     return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2604             sizeof(struct interval), ucs_cmp) != NULL;
2605 }
2606 
2607 struct vc_draw_region {
2608     unsigned long from, to;
2609     int x;
2610 };
2611 
2612 static void con_flush(struct vc_data *vc, struct vc_draw_region *draw)
2613 {
2614     if (draw->x < 0)
2615         return;
2616 
2617     vc->vc_sw->con_putcs(vc, (u16 *)draw->from,
2618             (u16 *)draw->to - (u16 *)draw->from, vc->state.y,
2619             draw->x);
2620     draw->x = -1;
2621 }
2622 
2623 static inline int vc_translate_ascii(const struct vc_data *vc, int c)
2624 {
2625     if (IS_ENABLED(CONFIG_CONSOLE_TRANSLATIONS)) {
2626         if (vc->vc_toggle_meta)
2627             c |= 0x80;
2628 
2629         return vc->vc_translate[c];
2630     }
2631 
2632     return c;
2633 }
2634 
2635 
2636 /**
2637  * vc_sanitize_unicode -- Replace invalid Unicode code points with U+FFFD
2638  * @c: the received character, or U+FFFD for invalid sequences.
2639  */
2640 static inline int vc_sanitize_unicode(const int c)
2641 {
2642     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2643         return 0xfffd;
2644 
2645     return c;
2646 }
2647 
2648 /**
2649  * vc_translate_unicode -- Combine UTF-8 into Unicode in @vc_utf_char
2650  * @vc: virtual console
2651  * @c: character to translate
2652  * @rescan: we return true if we need more (continuation) data
2653  *
2654  * @vc_utf_char is the being-constructed unicode character.
2655  * @vc_utf_count is the number of continuation bytes still expected to arrive.
2656  * @vc_npar is the number of continuation bytes arrived so far.
2657  */
2658 static int vc_translate_unicode(struct vc_data *vc, int c, bool *rescan)
2659 {
2660     static const u32 utf8_length_changes[] = {
2661         0x0000007f, 0x000007ff, 0x0000ffff,
2662         0x001fffff, 0x03ffffff, 0x7fffffff
2663     };
2664 
2665     /* Continuation byte received */
2666     if ((c & 0xc0) == 0x80) {
2667         /* Unexpected continuation byte? */
2668         if (!vc->vc_utf_count)
2669             return 0xfffd;
2670 
2671         vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2672         vc->vc_npar++;
2673         if (--vc->vc_utf_count)
2674             goto need_more_bytes;
2675 
2676         /* Got a whole character */
2677         c = vc->vc_utf_char;
2678         /* Reject overlong sequences */
2679         if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2680                 c > utf8_length_changes[vc->vc_npar])
2681             return 0xfffd;
2682 
2683         return vc_sanitize_unicode(c);
2684     }
2685 
2686     /* Single ASCII byte or first byte of a sequence received */
2687     if (vc->vc_utf_count) {
2688         /* Continuation byte expected */
2689         *rescan = true;
2690         vc->vc_utf_count = 0;
2691         return 0xfffd;
2692     }
2693 
2694     /* Nothing to do if an ASCII byte was received */
2695     if (c <= 0x7f)
2696         return c;
2697 
2698     /* First byte of a multibyte sequence received */
2699     vc->vc_npar = 0;
2700     if ((c & 0xe0) == 0xc0) {
2701         vc->vc_utf_count = 1;
2702         vc->vc_utf_char = (c & 0x1f);
2703     } else if ((c & 0xf0) == 0xe0) {
2704         vc->vc_utf_count = 2;
2705         vc->vc_utf_char = (c & 0x0f);
2706     } else if ((c & 0xf8) == 0xf0) {
2707         vc->vc_utf_count = 3;
2708         vc->vc_utf_char = (c & 0x07);
2709     } else if ((c & 0xfc) == 0xf8) {
2710         vc->vc_utf_count = 4;
2711         vc->vc_utf_char = (c & 0x03);
2712     } else if ((c & 0xfe) == 0xfc) {
2713         vc->vc_utf_count = 5;
2714         vc->vc_utf_char = (c & 0x01);
2715     } else {
2716         /* 254 and 255 are invalid */
2717         return 0xfffd;
2718     }
2719 
2720 need_more_bytes:
2721     return -1;
2722 }
2723 
2724 static int vc_translate(struct vc_data *vc, int *c, bool *rescan)
2725 {
2726     /* Do no translation at all in control states */
2727     if (vc->vc_state != ESnormal)
2728         return *c;
2729 
2730     if (vc->vc_utf && !vc->vc_disp_ctrl)
2731         return *c = vc_translate_unicode(vc, *c, rescan);
2732 
2733     /* no utf or alternate charset mode */
2734     return vc_translate_ascii(vc, *c);
2735 }
2736 
2737 static inline unsigned char vc_invert_attr(const struct vc_data *vc)
2738 {
2739     if (!vc->vc_can_do_color)
2740         return vc->vc_attr ^ 0x08;
2741 
2742     if (vc->vc_hi_font_mask == 0x100)
2743         return   (vc->vc_attr & 0x11) |
2744             ((vc->vc_attr & 0xe0) >> 4) |
2745             ((vc->vc_attr & 0x0e) << 4);
2746 
2747     return   (vc->vc_attr & 0x88) |
2748         ((vc->vc_attr & 0x70) >> 4) |
2749         ((vc->vc_attr & 0x07) << 4);
2750 }
2751 
2752 static bool vc_is_control(struct vc_data *vc, int tc, int c)
2753 {
2754     /*
2755      * A bitmap for codes <32. A bit of 1 indicates that the code
2756      * corresponding to that bit number invokes some special action (such
2757      * as cursor movement) and should not be displayed as a glyph unless
2758      * the disp_ctrl mode is explicitly enabled.
2759      */
2760     static const u32 CTRL_ACTION = 0x0d00ff81;
2761     /* Cannot be overridden by disp_ctrl */
2762     static const u32 CTRL_ALWAYS = 0x0800f501;
2763 
2764     if (vc->vc_state != ESnormal)
2765         return true;
2766 
2767     if (!tc)
2768         return true;
2769 
2770     /*
2771      * If the original code was a control character we only allow a glyph
2772      * to be displayed if the code is not normally used (such as for cursor
2773      * movement) or if the disp_ctrl mode has been explicitly enabled.
2774      * Certain characters (as given by the CTRL_ALWAYS bitmap) are always
2775      * displayed as control characters, as the console would be pretty
2776      * useless without them; to display an arbitrary font position use the
2777      * direct-to-font zone in UTF-8 mode.
2778      */
2779     if (c < 32) {
2780         if (vc->vc_disp_ctrl)
2781             return CTRL_ALWAYS & BIT(c);
2782         else
2783             return vc->vc_utf || (CTRL_ACTION & BIT(c));
2784     }
2785 
2786     if (c == 127 && !vc->vc_disp_ctrl)
2787         return true;
2788 
2789     if (c == 128 + 27)
2790         return true;
2791 
2792     return false;
2793 }
2794 
2795 static int vc_con_write_normal(struct vc_data *vc, int tc, int c,
2796         struct vc_draw_region *draw)
2797 {
2798     int next_c;
2799     unsigned char vc_attr = vc->vc_attr;
2800     u16 himask = vc->vc_hi_font_mask, charmask = himask ? 0x1ff : 0xff;
2801     u8 width = 1;
2802     bool inverse = false;
2803 
2804     if (vc->vc_utf && !vc->vc_disp_ctrl) {
2805         if (is_double_width(c))
2806             width = 2;
2807     }
2808 
2809     /* Now try to find out how to display it */
2810     tc = conv_uni_to_pc(vc, tc);
2811     if (tc & ~charmask) {
2812         if (tc == -1 || tc == -2)
2813             return -1; /* nothing to display */
2814 
2815         /* Glyph not found */
2816         if ((!vc->vc_utf || vc->vc_disp_ctrl || c < 128) &&
2817                 !(c & ~charmask)) {
2818             /*
2819              * In legacy mode use the glyph we get by a 1:1
2820              * mapping.
2821              * This would make absolutely no sense with Unicode in
2822              * mind, but do this for ASCII characters since a font
2823              * may lack Unicode mapping info and we don't want to
2824              * end up with having question marks only.
2825              */
2826             tc = c;
2827         } else {
2828             /*
2829              * Display U+FFFD. If it's not found, display an inverse
2830              * question mark.
2831              */
2832             tc = conv_uni_to_pc(vc, 0xfffd);
2833             if (tc < 0) {
2834                 inverse = true;
2835                 tc = conv_uni_to_pc(vc, '?');
2836                 if (tc < 0)
2837                     tc = '?';
2838 
2839                 vc_attr = vc_invert_attr(vc);
2840                 con_flush(vc, draw);
2841             }
2842         }
2843     }
2844 
2845     next_c = c;
2846     while (1) {
2847         if (vc->vc_need_wrap || vc->vc_decim)
2848             con_flush(vc, draw);
2849         if (vc->vc_need_wrap) {
2850             cr(vc);
2851             lf(vc);
2852         }
2853         if (vc->vc_decim)
2854             insert_char(vc, 1);
2855         vc_uniscr_putc(vc, next_c);
2856 
2857         if (himask)
2858             tc = ((tc & 0x100) ? himask : 0) |
2859                   (tc &  0xff);
2860         tc |= (vc_attr << 8) & ~himask;
2861 
2862         scr_writew(tc, (u16 *)vc->vc_pos);
2863 
2864         if (con_should_update(vc) && draw->x < 0) {
2865             draw->x = vc->state.x;
2866             draw->from = vc->vc_pos;
2867         }
2868         if (vc->state.x == vc->vc_cols - 1) {
2869             vc->vc_need_wrap = vc->vc_decawm;
2870             draw->to = vc->vc_pos + 2;
2871         } else {
2872             vc->state.x++;
2873             draw->to = (vc->vc_pos += 2);
2874         }
2875 
2876         if (!--width)
2877             break;
2878 
2879         /* A space is printed in the second column */
2880         tc = conv_uni_to_pc(vc, ' ');
2881         if (tc < 0)
2882             tc = ' ';
2883         next_c = ' ';
2884     }
2885     notify_write(vc, c);
2886 
2887     if (inverse)
2888         con_flush(vc, draw);
2889 
2890     return 0;
2891 }
2892 
2893 /* acquires console_lock */
2894 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2895 {
2896     struct vc_draw_region draw = {
2897         .x = -1,
2898     };
2899     int c, tc, n = 0;
2900     unsigned int currcons;
2901     struct vc_data *vc;
2902     struct vt_notifier_param param;
2903     bool rescan;
2904 
2905     if (in_interrupt())
2906         return count;
2907 
2908     console_lock();
2909     vc = tty->driver_data;
2910     if (vc == NULL) {
2911         pr_err("vt: argh, driver_data is NULL !\n");
2912         console_unlock();
2913         return 0;
2914     }
2915 
2916     currcons = vc->vc_num;
2917     if (!vc_cons_allocated(currcons)) {
2918         /* could this happen? */
2919         pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2920         console_unlock();
2921         return 0;
2922     }
2923 
2924 
2925     /* undraw cursor first */
2926     if (con_is_fg(vc))
2927         hide_cursor(vc);
2928 
2929     param.vc = vc;
2930 
2931     while (!tty->flow.stopped && count) {
2932         int orig = *buf;
2933         buf++;
2934         n++;
2935         count--;
2936 rescan_last_byte:
2937         c = orig;
2938         rescan = false;
2939 
2940         tc = vc_translate(vc, &c, &rescan);
2941         if (tc == -1)
2942             continue;
2943 
2944         param.c = tc;
2945         if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2946                     &param) == NOTIFY_STOP)
2947             continue;
2948 
2949         if (vc_is_control(vc, tc, c)) {
2950             con_flush(vc, &draw);
2951             do_con_trol(tty, vc, orig);
2952             continue;
2953         }
2954 
2955         if (vc_con_write_normal(vc, tc, c, &draw) < 0)
2956             continue;
2957 
2958         if (rescan)
2959             goto rescan_last_byte;
2960     }
2961     con_flush(vc, &draw);
2962     vc_uniscr_debug_check(vc);
2963     console_conditional_schedule();
2964     notify_update(vc);
2965     console_unlock();
2966     return n;
2967 }
2968 
2969 /*
2970  * This is the console switching callback.
2971  *
2972  * Doing console switching in a process context allows
2973  * us to do the switches asynchronously (needed when we want
2974  * to switch due to a keyboard interrupt).  Synchronization
2975  * with other console code and prevention of re-entrancy is
2976  * ensured with console_lock.
2977  */
2978 static void console_callback(struct work_struct *ignored)
2979 {
2980     console_lock();
2981 
2982     if (want_console >= 0) {
2983         if (want_console != fg_console &&
2984             vc_cons_allocated(want_console)) {
2985             hide_cursor(vc_cons[fg_console].d);
2986             change_console(vc_cons[want_console].d);
2987             /* we only changed when the console had already
2988                been allocated - a new console is not created
2989                in an interrupt routine */
2990         }
2991         want_console = -1;
2992     }
2993     if (do_poke_blanked_console) { /* do not unblank for a LED change */
2994         do_poke_blanked_console = 0;
2995         poke_blanked_console();
2996     }
2997     if (scrollback_delta) {
2998         struct vc_data *vc = vc_cons[fg_console].d;
2999         clear_selection();
3000         if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
3001             vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
3002         scrollback_delta = 0;
3003     }
3004     if (blank_timer_expired) {
3005         do_blank_screen(0);
3006         blank_timer_expired = 0;
3007     }
3008     notify_update(vc_cons[fg_console].d);
3009 
3010     console_unlock();
3011 }
3012 
3013 int set_console(int nr)
3014 {
3015     struct vc_data *vc = vc_cons[fg_console].d;
3016 
3017     if (!vc_cons_allocated(nr) || vt_dont_switch ||
3018         (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
3019 
3020         /*
3021          * Console switch will fail in console_callback() or
3022          * change_console() so there is no point scheduling
3023          * the callback
3024          *
3025          * Existing set_console() users don't check the return
3026          * value so this shouldn't break anything
3027          */
3028         return -EINVAL;
3029     }
3030 
3031     want_console = nr;
3032     schedule_console_callback();
3033 
3034     return 0;
3035 }
3036 
3037 struct tty_driver *console_driver;
3038 
3039 #ifdef CONFIG_VT_CONSOLE
3040 
3041 /**
3042  * vt_kmsg_redirect() - Sets/gets the kernel message console
3043  * @new:    The new virtual terminal number or -1 if the console should stay
3044  *      unchanged
3045  *
3046  * By default, the kernel messages are always printed on the current virtual
3047  * console. However, the user may modify that default with the
3048  * TIOCL_SETKMSGREDIRECT ioctl call.
3049  *
3050  * This function sets the kernel message console to be @new. It returns the old
3051  * virtual console number. The virtual terminal number 0 (both as parameter and
3052  * return value) means no redirection (i.e. always printed on the currently
3053  * active console).
3054  *
3055  * The parameter -1 means that only the current console is returned, but the
3056  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
3057  * case to make the code more understandable.
3058  *
3059  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
3060  * the parameter and always returns 0.
3061  */
3062 int vt_kmsg_redirect(int new)
3063 {
3064     static int kmsg_con;
3065 
3066     if (new != -1)
3067         return xchg(&kmsg_con, new);
3068     else
3069         return kmsg_con;
3070 }
3071 
3072 /*
3073  *  Console on virtual terminal
3074  *
3075  * The console must be locked when we get here.
3076  */
3077 
3078 static void vt_console_print(struct console *co, const char *b, unsigned count)
3079 {
3080     struct vc_data *vc = vc_cons[fg_console].d;
3081     unsigned char c;
3082     static DEFINE_SPINLOCK(printing_lock);
3083     const ushort *start;
3084     ushort start_x, cnt;
3085     int kmsg_console;
3086 
3087     /* console busy or not yet initialized */
3088     if (!printable)
3089         return;
3090     if (!spin_trylock(&printing_lock))
3091         return;
3092 
3093     kmsg_console = vt_get_kmsg_redirect();
3094     if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
3095         vc = vc_cons[kmsg_console - 1].d;
3096 
3097     if (!vc_cons_allocated(fg_console)) {
3098         /* impossible */
3099         /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
3100         goto quit;
3101     }
3102 
3103     if (vc->vc_mode != KD_TEXT)
3104         goto quit;
3105 
3106     /* undraw cursor first */
3107     if (con_is_fg(vc))
3108         hide_cursor(vc);
3109 
3110     start = (ushort *)vc->vc_pos;
3111     start_x = vc->state.x;
3112     cnt = 0;
3113     while (count--) {
3114         c = *b++;
3115         if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
3116             if (cnt && con_is_visible(vc))
3117                 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3118             cnt = 0;
3119             if (c == 8) {       /* backspace */
3120                 bs(vc);
3121                 start = (ushort *)vc->vc_pos;
3122                 start_x = vc->state.x;
3123                 continue;
3124             }
3125             if (c != 13)
3126                 lf(vc);
3127             cr(vc);
3128             start = (ushort *)vc->vc_pos;
3129             start_x = vc->state.x;
3130             if (c == 10 || c == 13)
3131                 continue;
3132         }
3133         vc_uniscr_putc(vc, c);
3134         scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
3135         notify_write(vc, c);
3136         cnt++;
3137         if (vc->state.x == vc->vc_cols - 1) {
3138             vc->vc_need_wrap = 1;
3139         } else {
3140             vc->vc_pos += 2;
3141             vc->state.x++;
3142         }
3143     }
3144     if (cnt && con_is_visible(vc))
3145         vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
3146     set_cursor(vc);
3147     notify_update(vc);
3148 
3149 quit:
3150     spin_unlock(&printing_lock);
3151 }
3152 
3153 static struct tty_driver *vt_console_device(struct console *c, int *index)
3154 {
3155     *index = c->index ? c->index-1 : fg_console;
3156     return console_driver;
3157 }
3158 
3159 static struct console vt_console_driver = {
3160     .name       = "tty",
3161     .write      = vt_console_print,
3162     .device     = vt_console_device,
3163     .unblank    = unblank_screen,
3164     .flags      = CON_PRINTBUFFER,
3165     .index      = -1,
3166 };
3167 #endif
3168 
3169 /*
3170  *  Handling of Linux-specific VC ioctls
3171  */
3172 
3173 /*
3174  * Generally a bit racy with respect to console_lock();.
3175  *
3176  * There are some functions which don't need it.
3177  *
3178  * There are some functions which can sleep for arbitrary periods
3179  * (paste_selection) but we don't need the lock there anyway.
3180  *
3181  * set_selection_user has locking, and definitely needs it
3182  */
3183 
3184 int tioclinux(struct tty_struct *tty, unsigned long arg)
3185 {
3186     char type, data;
3187     char __user *p = (char __user *)arg;
3188     int lines;
3189     int ret;
3190 
3191     if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3192         return -EPERM;
3193     if (get_user(type, p))
3194         return -EFAULT;
3195     ret = 0;
3196 
3197     switch (type)
3198     {
3199         case TIOCL_SETSEL:
3200             ret = set_selection_user((struct tiocl_selection
3201                          __user *)(p+1), tty);
3202             break;
3203         case TIOCL_PASTESEL:
3204             ret = paste_selection(tty);
3205             break;
3206         case TIOCL_UNBLANKSCREEN:
3207             console_lock();
3208             unblank_screen();
3209             console_unlock();
3210             break;
3211         case TIOCL_SELLOADLUT:
3212             console_lock();
3213             ret = sel_loadlut(p);
3214             console_unlock();
3215             break;
3216         case TIOCL_GETSHIFTSTATE:
3217 
3218     /*
3219      * Make it possible to react to Shift+Mousebutton.
3220      * Note that 'shift_state' is an undocumented
3221      * kernel-internal variable; programs not closely
3222      * related to the kernel should not use this.
3223      */
3224             data = vt_get_shift_state();
3225             ret = put_user(data, p);
3226             break;
3227         case TIOCL_GETMOUSEREPORTING:
3228             console_lock(); /* May be overkill */
3229             data = mouse_reporting();
3230             console_unlock();
3231             ret = put_user(data, p);
3232             break;
3233         case TIOCL_SETVESABLANK:
3234             console_lock();
3235             ret = set_vesa_blanking(p);
3236             console_unlock();
3237             break;
3238         case TIOCL_GETKMSGREDIRECT:
3239             data = vt_get_kmsg_redirect();
3240             ret = put_user(data, p);
3241             break;
3242         case TIOCL_SETKMSGREDIRECT:
3243             if (!capable(CAP_SYS_ADMIN)) {
3244                 ret = -EPERM;
3245             } else {
3246                 if (get_user(data, p+1))
3247                     ret = -EFAULT;
3248                 else
3249                     vt_kmsg_redirect(data);
3250             }
3251             break;
3252         case TIOCL_GETFGCONSOLE:
3253             /* No locking needed as this is a transiently
3254                correct return anyway if the caller hasn't
3255                disabled switching */
3256             ret = fg_console;
3257             break;
3258         case TIOCL_SCROLLCONSOLE:
3259             if (get_user(lines, (s32 __user *)(p+4))) {
3260                 ret = -EFAULT;
3261             } else {
3262                 /* Need the console lock here. Note that lots
3263                    of other calls need fixing before the lock
3264                    is actually useful ! */
3265                 console_lock();
3266                 scrollfront(vc_cons[fg_console].d, lines);
3267                 console_unlock();
3268                 ret = 0;
3269             }
3270             break;
3271         case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
3272             console_lock();
3273             ignore_poke = 1;
3274             do_blank_screen(0);
3275             console_unlock();
3276             break;
3277         case TIOCL_BLANKEDSCREEN:
3278             ret = console_blanked;
3279             break;
3280         default:
3281             ret = -EINVAL;
3282             break;
3283     }
3284     return ret;
3285 }
3286 
3287 /*
3288  * /dev/ttyN handling
3289  */
3290 
3291 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
3292 {
3293     int retval;
3294 
3295     retval = do_con_write(tty, buf, count);
3296     con_flush_chars(tty);
3297 
3298     return retval;
3299 }
3300 
3301 static int con_put_char(struct tty_struct *tty, unsigned char ch)
3302 {
3303     return do_con_write(tty, &ch, 1);
3304 }
3305 
3306 static unsigned int con_write_room(struct tty_struct *tty)
3307 {
3308     if (tty->flow.stopped)
3309         return 0;
3310     return 32768;       /* No limit, really; we're not buffering */
3311 }
3312 
3313 /*
3314  * con_throttle and con_unthrottle are only used for
3315  * paste_selection(), which has to stuff in a large number of
3316  * characters...
3317  */
3318 static void con_throttle(struct tty_struct *tty)
3319 {
3320 }
3321 
3322 static void con_unthrottle(struct tty_struct *tty)
3323 {
3324     struct vc_data *vc = tty->driver_data;
3325 
3326     wake_up_interruptible(&vc->paste_wait);
3327 }
3328 
3329 /*
3330  * Turn the Scroll-Lock LED on when the tty is stopped
3331  */
3332 static void con_stop(struct tty_struct *tty)
3333 {
3334     int console_num;
3335     if (!tty)
3336         return;
3337     console_num = tty->index;
3338     if (!vc_cons_allocated(console_num))
3339         return;
3340     vt_kbd_con_stop(console_num);
3341 }
3342 
3343 /*
3344  * Turn the Scroll-Lock LED off when the console is started
3345  */
3346 static void con_start(struct tty_struct *tty)
3347 {
3348     int console_num;
3349     if (!tty)
3350         return;
3351     console_num = tty->index;
3352     if (!vc_cons_allocated(console_num))
3353         return;
3354     vt_kbd_con_start(console_num);
3355 }
3356 
3357 static void con_flush_chars(struct tty_struct *tty)
3358 {
3359     struct vc_data *vc;
3360 
3361     if (in_interrupt()) /* from flush_to_ldisc */
3362         return;
3363 
3364     /* if we race with con_close(), vt may be null */
3365     console_lock();
3366     vc = tty->driver_data;
3367     if (vc)
3368         set_cursor(vc);
3369     console_unlock();
3370 }
3371 
3372 /*
3373  * Allocate the console screen memory.
3374  */
3375 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
3376 {
3377     unsigned int currcons = tty->index;
3378     struct vc_data *vc;
3379     int ret;
3380 
3381     console_lock();
3382     ret = vc_allocate(currcons);
3383     if (ret)
3384         goto unlock;
3385 
3386     vc = vc_cons[currcons].d;
3387 
3388     /* Still being freed */
3389     if (vc->port.tty) {
3390         ret = -ERESTARTSYS;
3391         goto unlock;
3392     }
3393 
3394     ret = tty_port_install(&vc->port, driver, tty);
3395     if (ret)
3396         goto unlock;
3397 
3398     tty->driver_data = vc;
3399     vc->port.tty = tty;
3400     tty_port_get(&vc->port);
3401 
3402     if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3403         tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3404         tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
3405     }
3406     if (vc->vc_utf)
3407         tty->termios.c_iflag |= IUTF8;
3408     else
3409         tty->termios.c_iflag &= ~IUTF8;
3410 unlock:
3411     console_unlock();
3412     return ret;
3413 }
3414 
3415 static int con_open(struct tty_struct *tty, struct file *filp)
3416 {
3417     /* everything done in install */
3418     return 0;
3419 }
3420 
3421 
3422 static void con_close(struct tty_struct *tty, struct file *filp)
3423 {
3424     /* Nothing to do - we defer to shutdown */
3425 }
3426 
3427 static void con_shutdown(struct tty_struct *tty)
3428 {
3429     struct vc_data *vc = tty->driver_data;
3430     BUG_ON(vc == NULL);
3431     console_lock();
3432     vc->port.tty = NULL;
3433     console_unlock();
3434 }
3435 
3436 static void con_cleanup(struct tty_struct *tty)
3437 {
3438     struct vc_data *vc = tty->driver_data;
3439 
3440     tty_port_put(&vc->port);
3441 }
3442 
3443 static int default_color           = 7; /* white */
3444 static int default_italic_color    = 2; // green (ASCII)
3445 static int default_underline_color = 3; // cyan (ASCII)
3446 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
3447 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3448 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3449 
3450 static void vc_init(struct vc_data *vc, unsigned int rows,
3451             unsigned int cols, int do_clear)
3452 {
3453     int j, k ;
3454 
3455     vc->vc_cols = cols;
3456     vc->vc_rows = rows;
3457     vc->vc_size_row = cols << 1;
3458     vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
3459 
3460     set_origin(vc);
3461     vc->vc_pos = vc->vc_origin;
3462     reset_vc(vc);
3463     for (j=k=0; j<16; j++) {
3464         vc->vc_palette[k++] = default_red[j] ;
3465         vc->vc_palette[k++] = default_grn[j] ;
3466         vc->vc_palette[k++] = default_blu[j] ;
3467     }
3468     vc->vc_def_color       = default_color;
3469     vc->vc_ulcolor         = default_underline_color;
3470     vc->vc_itcolor         = default_italic_color;
3471     vc->vc_halfcolor       = 0x08;   /* grey */
3472     init_waitqueue_head(&vc->paste_wait);
3473     reset_terminal(vc, do_clear);
3474 }
3475 
3476 /*
3477  * This routine initializes console interrupts, and does nothing
3478  * else. If you want the screen to clear, call tty_write with
3479  * the appropriate escape-sequence.
3480  */
3481 
3482 static int __init con_init(void)
3483 {
3484     const char *display_desc = NULL;
3485     struct vc_data *vc;
3486     unsigned int currcons = 0, i;
3487 
3488     console_lock();
3489 
3490     if (!conswitchp)
3491         conswitchp = &dummy_con;
3492     display_desc = conswitchp->con_startup();
3493     if (!display_desc) {
3494         fg_console = 0;
3495         console_unlock();
3496         return 0;
3497     }
3498 
3499     for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3500         struct con_driver *con_driver = &registered_con_driver[i];
3501 
3502         if (con_driver->con == NULL) {
3503             con_driver->con = conswitchp;
3504             con_driver->desc = display_desc;
3505             con_driver->flag = CON_DRIVER_FLAG_INIT;
3506             con_driver->first = 0;
3507             con_driver->last = MAX_NR_CONSOLES - 1;
3508             break;
3509         }
3510     }
3511 
3512     for (i = 0; i < MAX_NR_CONSOLES; i++)
3513         con_driver_map[i] = conswitchp;
3514 
3515     if (blankinterval) {
3516         blank_state = blank_normal_wait;
3517         mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3518     }
3519 
3520     for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3521         vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3522         INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3523         tty_port_init(&vc->port);
3524         visual_init(vc, currcons, 1);
3525         /* Assuming vc->vc_{cols,rows,screenbuf_size} are sane here. */
3526         vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3527         vc_init(vc, vc->vc_rows, vc->vc_cols,
3528             currcons || !vc->vc_sw->con_save_screen);
3529     }
3530     currcons = fg_console = 0;
3531     master_display_fg = vc = vc_cons[currcons].d;
3532     set_origin(vc);
3533     save_screen(vc);
3534     gotoxy(vc, vc->state.x, vc->state.y);
3535     csi_J(vc, 0);
3536     update_screen(vc);
3537     pr_info("Console: %s %s %dx%d\n",
3538         vc->vc_can_do_color ? "colour" : "mono",
3539         display_desc, vc->vc_cols, vc->vc_rows);
3540     printable = 1;
3541 
3542     console_unlock();
3543 
3544 #ifdef CONFIG_VT_CONSOLE
3545     register_console(&vt_console_driver);
3546 #endif
3547     return 0;
3548 }
3549 console_initcall(con_init);
3550 
3551 static const struct tty_operations con_ops = {
3552     .install = con_install,
3553     .open = con_open,
3554     .close = con_close,
3555     .write = con_write,
3556     .write_room = con_write_room,
3557     .put_char = con_put_char,
3558     .flush_chars = con_flush_chars,
3559     .ioctl = vt_ioctl,
3560 #ifdef CONFIG_COMPAT
3561     .compat_ioctl = vt_compat_ioctl,
3562 #endif
3563     .stop = con_stop,
3564     .start = con_start,
3565     .throttle = con_throttle,
3566     .unthrottle = con_unthrottle,
3567     .resize = vt_resize,
3568     .shutdown = con_shutdown,
3569     .cleanup = con_cleanup,
3570 };
3571 
3572 static struct cdev vc0_cdev;
3573 
3574 static ssize_t show_tty_active(struct device *dev,
3575                 struct device_attribute *attr, char *buf)
3576 {
3577     return sprintf(buf, "tty%d\n", fg_console + 1);
3578 }
3579 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3580 
3581 static struct attribute *vt_dev_attrs[] = {
3582     &dev_attr_active.attr,
3583     NULL
3584 };
3585 
3586 ATTRIBUTE_GROUPS(vt_dev);
3587 
3588 int __init vty_init(const struct file_operations *console_fops)
3589 {
3590     cdev_init(&vc0_cdev, console_fops);
3591     if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3592         register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3593         panic("Couldn't register /dev/tty0 driver\n");
3594     tty0dev = device_create_with_groups(tty_class, NULL,
3595                         MKDEV(TTY_MAJOR, 0), NULL,
3596                         vt_dev_groups, "tty0");
3597     if (IS_ERR(tty0dev))
3598         tty0dev = NULL;
3599 
3600     vcs_init();
3601 
3602     console_driver = tty_alloc_driver(MAX_NR_CONSOLES, TTY_DRIVER_REAL_RAW |
3603             TTY_DRIVER_RESET_TERMIOS);
3604     if (IS_ERR(console_driver))
3605         panic("Couldn't allocate console driver\n");
3606 
3607     console_driver->name = "tty";
3608     console_driver->name_base = 1;
3609     console_driver->major = TTY_MAJOR;
3610     console_driver->minor_start = 1;
3611     console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3612     console_driver->init_termios = tty_std_termios;
3613     if (default_utf8)
3614         console_driver->init_termios.c_iflag |= IUTF8;
3615     tty_set_operations(console_driver, &con_ops);
3616     if (tty_register_driver(console_driver))
3617         panic("Couldn't register console driver\n");
3618     kbd_init();
3619     console_map_init();
3620 #ifdef CONFIG_MDA_CONSOLE
3621     mda_console_init();
3622 #endif
3623     return 0;
3624 }
3625 
3626 #ifndef VT_SINGLE_DRIVER
3627 
3628 static struct class *vtconsole_class;
3629 
3630 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3631                int deflt)
3632 {
3633     struct module *owner = csw->owner;
3634     const char *desc = NULL;
3635     struct con_driver *con_driver;
3636     int i, j = -1, k = -1, retval = -ENODEV;
3637 
3638     if (!try_module_get(owner))
3639         return -ENODEV;
3640 
3641     WARN_CONSOLE_UNLOCKED();
3642 
3643     /* check if driver is registered */
3644     for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3645         con_driver = &registered_con_driver[i];
3646 
3647         if (con_driver->con == csw) {
3648             desc = con_driver->desc;
3649             retval = 0;
3650             break;
3651         }
3652     }
3653 
3654     if (retval)
3655         goto err;
3656 
3657     if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3658         csw->con_startup();
3659         con_driver->flag |= CON_DRIVER_FLAG_INIT;
3660     }
3661 
3662     if (deflt) {
3663         if (conswitchp)
3664             module_put(conswitchp->owner);
3665 
3666         __module_get(owner);
3667         conswitchp = csw;
3668     }
3669 
3670     first = max(first, con_driver->first);
3671     last = min(last, con_driver->last);
3672 
3673     for (i = first; i <= last; i++) {
3674         int old_was_color;
3675         struct vc_data *vc = vc_cons[i].d;
3676 
3677         if (con_driver_map[i])
3678             module_put(con_driver_map[i]->owner);
3679         __module_get(owner);
3680         con_driver_map[i] = csw;
3681 
3682         if (!vc || !vc->vc_sw)
3683             continue;
3684 
3685         j = i;
3686 
3687         if (con_is_visible(vc)) {
3688             k = i;
3689             save_screen(vc);
3690         }
3691 
3692         old_was_color = vc->vc_can_do_color;
3693         vc->vc_sw->con_deinit(vc);
3694         vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3695         visual_init(vc, i, 0);
3696         set_origin(vc);
3697         update_attr(vc);
3698 
3699         /* If the console changed between mono <-> color, then
3700          * the attributes in the screenbuf will be wrong.  The
3701          * following resets all attributes to something sane.
3702          */
3703         if (old_was_color != vc->vc_can_do_color)
3704             clear_buffer_attributes(vc);
3705     }
3706 
3707     pr_info("Console: switching ");
3708     if (!deflt)
3709         pr_cont("consoles %d-%d ", first + 1, last + 1);
3710     if (j >= 0) {
3711         struct vc_data *vc = vc_cons[j].d;
3712 
3713         pr_cont("to %s %s %dx%d\n",
3714             vc->vc_can_do_color ? "colour" : "mono",
3715             desc, vc->vc_cols, vc->vc_rows);
3716 
3717         if (k >= 0) {
3718             vc = vc_cons[k].d;
3719             update_screen(vc);
3720         }
3721     } else {
3722         pr_cont("to %s\n", desc);
3723     }
3724 
3725     retval = 0;
3726 err:
3727     module_put(owner);
3728     return retval;
3729 };
3730 
3731 
3732 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3733 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3734 {
3735     struct module *owner = csw->owner;
3736     const struct consw *defcsw = NULL;
3737     struct con_driver *con_driver = NULL, *con_back = NULL;
3738     int i, retval = -ENODEV;
3739 
3740     if (!try_module_get(owner))
3741         return -ENODEV;
3742 
3743     WARN_CONSOLE_UNLOCKED();
3744 
3745     /* check if driver is registered and if it is unbindable */
3746     for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3747         con_driver = &registered_con_driver[i];
3748 
3749         if (con_driver->con == csw &&
3750             con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3751             retval = 0;
3752             break;
3753         }
3754     }
3755 
3756     if (retval)
3757         goto err;
3758 
3759     retval = -ENODEV;
3760 
3761     /* check if backup driver exists */
3762     for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3763         con_back = &registered_con_driver[i];
3764 
3765         if (con_back->con && con_back->con != csw) {
3766             defcsw = con_back->con;
3767             retval = 0;
3768             break;
3769         }
3770     }
3771 
3772     if (retval)
3773         goto err;
3774 
3775     if (!con_is_bound(csw))
3776         goto err;
3777 
3778     first = max(first, con_driver->first);
3779     last = min(last, con_driver->last);
3780 
3781     for (i = first; i <= last; i++) {
3782         if (con_driver_map[i] == csw) {
3783             module_put(csw->owner);
3784             con_driver_map[i] = NULL;
3785         }
3786     }
3787 
3788     if (!con_is_bound(defcsw)) {
3789         const struct consw *defconsw = conswitchp;
3790 
3791         defcsw->con_startup();
3792         con_back->flag |= CON_DRIVER_FLAG_INIT;
3793         /*
3794          * vgacon may change the default driver to point
3795          * to dummycon, we restore it here...
3796          */
3797         conswitchp = defconsw;
3798     }
3799 
3800     if (!con_is_bound(csw))
3801         con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3802 
3803     /* ignore return value, binding should not fail */
3804     do_bind_con_driver(defcsw, first, last, deflt);
3805 err:
3806     module_put(owner);
3807     return retval;
3808 
3809 }
3810 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3811 
3812 static int vt_bind(struct con_driver *con)
3813 {
3814     const struct consw *defcsw = NULL, *csw = NULL;
3815     int i, more = 1, first = -1, last = -1, deflt = 0;
3816 
3817     if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3818         goto err;
3819 
3820     csw = con->con;
3821 
3822     for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3823         struct con_driver *con = &registered_con_driver[i];
3824 
3825         if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3826             defcsw = con->con;
3827             break;
3828         }
3829     }
3830 
3831     if (!defcsw)
3832         goto err;
3833 
3834     while (more) {
3835         more = 0;
3836 
3837         for (i = con->first; i <= con->last; i++) {
3838             if (con_driver_map[i] == defcsw) {
3839                 if (first == -1)
3840                     first = i;
3841                 last = i;
3842                 more = 1;
3843             } else if (first != -1)
3844                 break;
3845         }
3846 
3847         if (first == 0 && last == MAX_NR_CONSOLES -1)
3848             deflt = 1;
3849 
3850         if (first != -1)
3851             do_bind_con_driver(csw, first, last, deflt);
3852 
3853         first = -1;
3854         last = -1;
3855         deflt = 0;
3856     }
3857 
3858 err:
3859     return 0;
3860 }
3861 
3862 static int vt_unbind(struct con_driver *con)
3863 {
3864     const struct consw *csw = NULL;
3865     int i, more = 1, first = -1, last = -1, deflt = 0;
3866     int ret;
3867 
3868     if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3869         goto err;
3870 
3871     csw = con->con;
3872 
3873     while (more) {
3874         more = 0;
3875 
3876         for (i = con->first; i <= con->last; i++) {
3877             if (con_driver_map[i] == csw) {
3878                 if (first == -1)
3879                     first = i;
3880                 last = i;
3881                 more = 1;
3882             } else if (first != -1)
3883                 break;
3884         }
3885 
3886         if (first == 0 && last == MAX_NR_CONSOLES -1)
3887             deflt = 1;
3888 
3889         if (first != -1) {
3890             ret = do_unbind_con_driver(csw, first, last, deflt);
3891             if (ret != 0)
3892                 return ret;
3893         }
3894 
3895         first = -1;
3896         last = -1;
3897         deflt = 0;
3898     }
3899 
3900 err:
3901     return 0;
3902 }
3903 #else
3904 static inline int vt_bind(struct con_driver *con)
3905 {
3906     return 0;
3907 }
3908 static inline int vt_unbind(struct con_driver *con)
3909 {
3910     return 0;
3911 }
3912 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3913 
3914 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3915               const char *buf, size_t count)
3916 {
3917     struct con_driver *con = dev_get_drvdata(dev);
3918     int bind = simple_strtoul(buf, NULL, 0);
3919 
3920     console_lock();
3921 
3922     if (bind)
3923         vt_bind(con);
3924     else
3925         vt_unbind(con);
3926 
3927     console_unlock();
3928 
3929     return count;
3930 }
3931 
3932 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3933              char *buf)
3934 {
3935     struct con_driver *con = dev_get_drvdata(dev);
3936     int bind;
3937 
3938     console_lock();
3939     bind = con_is_bound(con->con);
3940     console_unlock();
3941 
3942     return sysfs_emit(buf, "%i\n", bind);
3943 }
3944 
3945 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3946              char *buf)
3947 {
3948     struct con_driver *con = dev_get_drvdata(dev);
3949 
3950     return sysfs_emit(buf, "%s %s\n",
3951             (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3952              con->desc);
3953 
3954 }
3955 
3956 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3957 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3958 
3959 static struct attribute *con_dev_attrs[] = {
3960     &dev_attr_bind.attr,
3961     &dev_attr_name.attr,
3962     NULL
3963 };
3964 
3965 ATTRIBUTE_GROUPS(con_dev);
3966 
3967 static int vtconsole_init_device(struct con_driver *con)
3968 {
3969     con->flag |= CON_DRIVER_FLAG_ATTR;
3970     return 0;
3971 }
3972 
3973 static void vtconsole_deinit_device(struct con_driver *con)
3974 {
3975     con->flag &= ~CON_DRIVER_FLAG_ATTR;
3976 }
3977 
3978 /**
3979  * con_is_bound - checks if driver is bound to the console
3980  * @csw: console driver
3981  *
3982  * RETURNS: zero if unbound, nonzero if bound
3983  *
3984  * Drivers can call this and if zero, they should release
3985  * all resources allocated on con_startup()
3986  */
3987 int con_is_bound(const struct consw *csw)
3988 {
3989     int i, bound = 0;
3990 
3991     WARN_CONSOLE_UNLOCKED();
3992 
3993     for (i = 0; i < MAX_NR_CONSOLES; i++) {
3994         if (con_driver_map[i] == csw) {
3995             bound = 1;
3996             break;
3997         }
3998     }
3999 
4000     return bound;
4001 }
4002 EXPORT_SYMBOL(con_is_bound);
4003 
4004 /**
4005  * con_is_visible - checks whether the current console is visible
4006  * @vc: virtual console
4007  *
4008  * RETURNS: zero if not visible, nonzero if visible
4009  */
4010 bool con_is_visible(const struct vc_data *vc)
4011 {
4012     WARN_CONSOLE_UNLOCKED();
4013 
4014     return *vc->vc_display_fg == vc;
4015 }
4016 EXPORT_SYMBOL(con_is_visible);
4017 
4018 /**
4019  * con_debug_enter - prepare the console for the kernel debugger
4020  * @vc: virtual console
4021  *
4022  * Called when the console is taken over by the kernel debugger, this
4023  * function needs to save the current console state, then put the console
4024  * into a state suitable for the kernel debugger.
4025  *
4026  * RETURNS:
4027  * Zero on success, nonzero if a failure occurred when trying to prepare
4028  * the console for the debugger.
4029  */
4030 int con_debug_enter(struct vc_data *vc)
4031 {
4032     int ret = 0;
4033 
4034     saved_fg_console = fg_console;
4035     saved_last_console = last_console;
4036     saved_want_console = want_console;
4037     saved_vc_mode = vc->vc_mode;
4038     saved_console_blanked = console_blanked;
4039     vc->vc_mode = KD_TEXT;
4040     console_blanked = 0;
4041     if (vc->vc_sw->con_debug_enter)
4042         ret = vc->vc_sw->con_debug_enter(vc);
4043 #ifdef CONFIG_KGDB_KDB
4044     /* Set the initial LINES variable if it is not already set */
4045     if (vc->vc_rows < 999) {
4046         int linecount;
4047         char lns[4];
4048         const char *setargs[3] = {
4049             "set",
4050             "LINES",
4051             lns,
4052         };
4053         if (kdbgetintenv(setargs[0], &linecount)) {
4054             snprintf(lns, 4, "%i", vc->vc_rows);
4055             kdb_set(2, setargs);
4056         }
4057     }
4058     if (vc->vc_cols < 999) {
4059         int colcount;
4060         char cols[4];
4061         const char *setargs[3] = {
4062             "set",
4063             "COLUMNS",
4064             cols,
4065         };
4066         if (kdbgetintenv(setargs[0], &colcount)) {
4067             snprintf(cols, 4, "%i", vc->vc_cols);
4068             kdb_set(2, setargs);
4069         }
4070     }
4071 #endif /* CONFIG_KGDB_KDB */
4072     return ret;
4073 }
4074 EXPORT_SYMBOL_GPL(con_debug_enter);
4075 
4076 /**
4077  * con_debug_leave - restore console state
4078  *
4079  * Restore the console state to what it was before the kernel debugger
4080  * was invoked.
4081  *
4082  * RETURNS:
4083  * Zero on success, nonzero if a failure occurred when trying to restore
4084  * the console.
4085  */
4086 int con_debug_leave(void)
4087 {
4088     struct vc_data *vc;
4089     int ret = 0;
4090 
4091     fg_console = saved_fg_console;
4092     last_console = saved_last_console;
4093     want_console = saved_want_console;
4094     console_blanked = saved_console_blanked;
4095     vc_cons[fg_console].d->vc_mode = saved_vc_mode;
4096 
4097     vc = vc_cons[fg_console].d;
4098     if (vc->vc_sw->con_debug_leave)
4099         ret = vc->vc_sw->con_debug_leave(vc);
4100     return ret;
4101 }
4102 EXPORT_SYMBOL_GPL(con_debug_leave);
4103 
4104 static int do_register_con_driver(const struct consw *csw, int first, int last)
4105 {
4106     struct module *owner = csw->owner;
4107     struct con_driver *con_driver;
4108     const char *desc;
4109     int i, retval;
4110 
4111     WARN_CONSOLE_UNLOCKED();
4112 
4113     if (!try_module_get(owner))
4114         return -ENODEV;
4115 
4116     for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4117         con_driver = &registered_con_driver[i];
4118 
4119         /* already registered */
4120         if (con_driver->con == csw) {
4121             retval = -EBUSY;
4122             goto err;
4123         }
4124     }
4125 
4126     desc = csw->con_startup();
4127     if (!desc) {
4128         retval = -ENODEV;
4129         goto err;
4130     }
4131 
4132     retval = -EINVAL;
4133 
4134     for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4135         con_driver = &registered_con_driver[i];
4136 
4137         if (con_driver->con == NULL &&
4138             !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
4139             con_driver->con = csw;
4140             con_driver->desc = desc;
4141             con_driver->node = i;
4142             con_driver->flag = CON_DRIVER_FLAG_MODULE |
4143                                CON_DRIVER_FLAG_INIT;
4144             con_driver->first = first;
4145             con_driver->last = last;
4146             retval = 0;
4147             break;
4148         }
4149     }
4150 
4151     if (retval)
4152         goto err;
4153 
4154     con_driver->dev =
4155         device_create_with_groups(vtconsole_class, NULL,
4156                       MKDEV(0, con_driver->node),
4157                       con_driver, con_dev_groups,
4158                       "vtcon%i", con_driver->node);
4159     if (IS_ERR(con_driver->dev)) {
4160         pr_warn("Unable to create device for %s; errno = %ld\n",
4161             con_driver->desc, PTR_ERR(con_driver->dev));
4162         con_driver->dev = NULL;
4163     } else {
4164         vtconsole_init_device(con_driver);
4165     }
4166 
4167 err:
4168     module_put(owner);
4169     return retval;
4170 }
4171 
4172 
4173 /**
4174  * do_unregister_con_driver - unregister console driver from console layer
4175  * @csw: console driver
4176  *
4177  * DESCRIPTION: All drivers that registers to the console layer must
4178  * call this function upon exit, or if the console driver is in a state
4179  * where it won't be able to handle console services, such as the
4180  * framebuffer console without loaded framebuffer drivers.
4181  *
4182  * The driver must unbind first prior to unregistration.
4183  */
4184 int do_unregister_con_driver(const struct consw *csw)
4185 {
4186     int i;
4187 
4188     /* cannot unregister a bound driver */
4189     if (con_is_bound(csw))
4190         return -EBUSY;
4191 
4192     if (csw == conswitchp)
4193         return -EINVAL;
4194 
4195     for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4196         struct con_driver *con_driver = &registered_con_driver[i];
4197 
4198         if (con_driver->con == csw) {
4199             /*
4200              * Defer the removal of the sysfs entries since that
4201              * will acquire the kernfs s_active lock and we can't
4202              * acquire this lock while holding the console lock:
4203              * the unbind sysfs entry imposes already the opposite
4204              * order. Reset con already here to prevent any later
4205              * lookup to succeed and mark this slot as zombie, so
4206              * it won't get reused until we complete the removal
4207              * in the deferred work.
4208              */
4209             con_driver->con = NULL;
4210             con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4211             schedule_work(&con_driver_unregister_work);
4212 
4213             return 0;
4214         }
4215     }
4216 
4217     return -ENODEV;
4218 }
4219 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
4220 
4221 static void con_driver_unregister_callback(struct work_struct *ignored)
4222 {
4223     int i;
4224 
4225     console_lock();
4226 
4227     for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4228         struct con_driver *con_driver = &registered_con_driver[i];
4229 
4230         if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4231             continue;
4232 
4233         console_unlock();
4234 
4235         vtconsole_deinit_device(con_driver);
4236         device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
4237 
4238         console_lock();
4239 
4240         if (WARN_ON_ONCE(con_driver->con))
4241             con_driver->con = NULL;
4242         con_driver->desc = NULL;
4243         con_driver->dev = NULL;
4244         con_driver->node = 0;
4245         WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4246         con_driver->flag = 0;
4247         con_driver->first = 0;
4248         con_driver->last = 0;
4249     }
4250 
4251     console_unlock();
4252 }
4253 
4254 /*
4255  *  If we support more console drivers, this function is used
4256  *  when a driver wants to take over some existing consoles
4257  *  and become default driver for newly opened ones.
4258  *
4259  *  do_take_over_console is basically a register followed by bind
4260  */
4261 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4262 {
4263     int err;
4264 
4265     err = do_register_con_driver(csw, first, last);
4266     /*
4267      * If we get an busy error we still want to bind the console driver
4268      * and return success, as we may have unbound the console driver
4269      * but not unregistered it.
4270      */
4271     if (err == -EBUSY)
4272         err = 0;
4273     if (!err)
4274         do_bind_con_driver(csw, first, last, deflt);
4275 
4276     return err;
4277 }
4278 EXPORT_SYMBOL_GPL(do_take_over_console);
4279 
4280 
4281 /*
4282  * give_up_console is a wrapper to unregister_con_driver. It will only
4283  * work if driver is fully unbound.
4284  */
4285 void give_up_console(const struct consw *csw)
4286 {
4287     console_lock();
4288     do_unregister_con_driver(csw);
4289     console_unlock();
4290 }
4291 
4292 static int __init vtconsole_class_init(void)
4293 {
4294     int i;
4295 
4296     vtconsole_class = class_create(THIS_MODULE, "vtconsole");
4297     if (IS_ERR(vtconsole_class)) {
4298         pr_warn("Unable to create vt console class; errno = %ld\n",
4299             PTR_ERR(vtconsole_class));
4300         vtconsole_class = NULL;
4301     }
4302 
4303     /* Add system drivers to sysfs */
4304     for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4305         struct con_driver *con = &registered_con_driver[i];
4306 
4307         if (con->con && !con->dev) {
4308             con->dev =
4309                 device_create_with_groups(vtconsole_class, NULL,
4310                               MKDEV(0, con->node),
4311                               con, con_dev_groups,
4312                               "vtcon%i", con->node);
4313 
4314             if (IS_ERR(con->dev)) {
4315                 pr_warn("Unable to create device for %s; errno = %ld\n",
4316                     con->desc, PTR_ERR(con->dev));
4317                 con->dev = NULL;
4318             } else {
4319                 vtconsole_init_device(con);
4320             }
4321         }
4322     }
4323 
4324     return 0;
4325 }
4326 postcore_initcall(vtconsole_class_init);
4327 
4328 #endif
4329 
4330 /*
4331  *  Screen blanking
4332  */
4333 
4334 static int set_vesa_blanking(char __user *p)
4335 {
4336     unsigned int mode;
4337 
4338     if (get_user(mode, p + 1))
4339         return -EFAULT;
4340 
4341     vesa_blank_mode = (mode < 4) ? mode : 0;
4342     return 0;
4343 }
4344 
4345 void do_blank_screen(int entering_gfx)
4346 {
4347     struct vc_data *vc = vc_cons[fg_console].d;
4348     int i;
4349 
4350     might_sleep();
4351 
4352     WARN_CONSOLE_UNLOCKED();
4353 
4354     if (console_blanked) {
4355         if (blank_state == blank_vesa_wait) {
4356             blank_state = blank_off;
4357             vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
4358         }
4359         return;
4360     }
4361 
4362     /* entering graphics mode? */
4363     if (entering_gfx) {
4364         hide_cursor(vc);
4365         save_screen(vc);
4366         vc->vc_sw->con_blank(vc, -1, 1);
4367         console_blanked = fg_console + 1;
4368         blank_state = blank_off;
4369         set_origin(vc);
4370         return;
4371     }
4372 
4373     blank_state = blank_off;
4374 
4375     /* don't blank graphics */
4376     if (vc->vc_mode != KD_TEXT) {
4377         console_blanked = fg_console + 1;
4378         return;
4379     }
4380 
4381     hide_cursor(vc);
4382     del_timer_sync(&console_timer);
4383     blank_timer_expired = 0;
4384 
4385     save_screen(vc);
4386     /* In case we need to reset origin, blanking hook returns 1 */
4387     i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
4388     console_blanked = fg_console + 1;
4389     if (i)
4390         set_origin(vc);
4391 
4392     if (console_blank_hook && console_blank_hook(1))
4393         return;
4394 
4395     if (vesa_off_interval && vesa_blank_mode) {
4396         blank_state = blank_vesa_wait;
4397         mod_timer(&console_timer, jiffies + vesa_off_interval);
4398     }
4399     vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
4400 }
4401 EXPORT_SYMBOL(do_blank_screen);
4402 
4403 /*
4404  * Called by timer as well as from vt_console_driver
4405  */
4406 void do_unblank_screen(int leaving_gfx)
4407 {
4408     struct vc_data *vc;
4409 
4410     /* This should now always be called from a "sane" (read: can schedule)
4411      * context for the sake of the low level drivers, except in the special
4412      * case of oops_in_progress
4413      */
4414     if (!oops_in_progress)
4415         might_sleep();
4416 
4417     WARN_CONSOLE_UNLOCKED();
4418 
4419     ignore_poke = 0;
4420     if (!console_blanked)
4421         return;
4422     if (!vc_cons_allocated(fg_console)) {
4423         /* impossible */
4424         pr_warn("unblank_screen: tty %d not allocated ??\n",
4425             fg_console + 1);
4426         return;
4427     }
4428     vc = vc_cons[fg_console].d;
4429     if (vc->vc_mode != KD_TEXT)
4430         return; /* but leave console_blanked != 0 */
4431 
4432     if (blankinterval) {
4433         mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4434         blank_state = blank_normal_wait;
4435     }
4436 
4437     console_blanked = 0;
4438     if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
4439         /* Low-level driver cannot restore -> do it ourselves */
4440         update_screen(vc);
4441     if (console_blank_hook)
4442         console_blank_hook(0);
4443     set_palette(vc);
4444     set_cursor(vc);
4445     vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
4446 }
4447 EXPORT_SYMBOL(do_unblank_screen);
4448 
4449 /*
4450  * This is called by the outside world to cause a forced unblank, mostly for
4451  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4452  * call it with 1 as an argument and so force a mode restore... that may kill
4453  * X or at least garbage the screen but would also make the Oops visible...
4454  */
4455 void unblank_screen(void)
4456 {
4457     do_unblank_screen(0);
4458 }
4459 
4460 /*
4461  * We defer the timer blanking to work queue so it can take the console mutex
4462  * (console operations can still happen at irq time, but only from printk which
4463  * has the console mutex. Not perfect yet, but better than no locking
4464  */
4465 static void blank_screen_t(struct timer_list *unused)
4466 {
4467     blank_timer_expired = 1;
4468     schedule_work(&console_work);
4469 }
4470 
4471 void poke_blanked_console(void)
4472 {
4473     WARN_CONSOLE_UNLOCKED();
4474 
4475     /* Add this so we quickly catch whoever might call us in a non
4476      * safe context. Nowadays, unblank_screen() isn't to be called in
4477      * atomic contexts and is allowed to schedule (with the special case
4478      * of oops_in_progress, but that isn't of any concern for this
4479      * function. --BenH.
4480      */
4481     might_sleep();
4482 
4483     /* This isn't perfectly race free, but a race here would be mostly harmless,
4484      * at worst, we'll do a spurious blank and it's unlikely
4485      */
4486     del_timer(&console_timer);
4487     blank_timer_expired = 0;
4488 
4489     if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4490         return;
4491     if (console_blanked)
4492         unblank_screen();
4493     else if (blankinterval) {
4494         mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4495         blank_state = blank_normal_wait;
4496     }
4497 }
4498 
4499 /*
4500  *  Palettes
4501  */
4502 
4503 static void set_palette(struct vc_data *vc)
4504 {
4505     WARN_CONSOLE_UNLOCKED();
4506 
4507     if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
4508         vc->vc_sw->con_set_palette(vc, color_table);
4509 }
4510 
4511 /*
4512  * Load palette into the DAC registers. arg points to a colour
4513  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4514  */
4515 
4516 int con_set_cmap(unsigned char __user *arg)
4517 {
4518     int i, j, k;
4519     unsigned char colormap[3*16];
4520 
4521     if (copy_from_user(colormap, arg, sizeof(colormap)))
4522         return -EFAULT;
4523 
4524     console_lock();
4525     for (i = k = 0; i < 16; i++) {
4526         default_red[i] = colormap[k++];
4527         default_grn[i] = colormap[k++];
4528         default_blu[i] = colormap[k++];
4529     }
4530     for (i = 0; i < MAX_NR_CONSOLES; i++) {
4531         if (!vc_cons_allocated(i))
4532             continue;
4533         for (j = k = 0; j < 16; j++) {
4534             vc_cons[i].d->vc_palette[k++] = default_red[j];
4535             vc_cons[i].d->vc_palette[k++] = default_grn[j];
4536             vc_cons[i].d->vc_palette[k++] = default_blu[j];
4537         }
4538         set_palette(vc_cons[i].d);
4539     }
4540     console_unlock();
4541 
4542     return 0;
4543 }
4544 
4545 int con_get_cmap(unsigned char __user *arg)
4546 {
4547     int i, k;
4548     unsigned char colormap[3*16];
4549 
4550     console_lock();
4551     for (i = k = 0; i < 16; i++) {
4552         colormap[k++] = default_red[i];
4553         colormap[k++] = default_grn[i];
4554         colormap[k++] = default_blu[i];
4555     }
4556     console_unlock();
4557 
4558     if (copy_to_user(arg, colormap, sizeof(colormap)))
4559         return -EFAULT;
4560 
4561     return 0;
4562 }
4563 
4564 void reset_palette(struct vc_data *vc)
4565 {
4566     int j, k;
4567     for (j=k=0; j<16; j++) {
4568         vc->vc_palette[k++] = default_red[j];
4569         vc->vc_palette[k++] = default_grn[j];
4570         vc->vc_palette[k++] = default_blu[j];
4571     }
4572     set_palette(vc);
4573 }
4574 
4575 /*
4576  *  Font switching
4577  *
4578  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
4579  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints, 
4580  *  depending on width) reserved for each character which is kinda wasty, but 
4581  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It 
4582  *  is up to the actual low-level console-driver convert data into its favorite
4583  *  format (maybe we should add a `fontoffset' field to the `display'
4584  *  structure so we won't have to convert the fontdata all the time.
4585  *  /Jes
4586  */
4587 
4588 #define max_font_size 65536
4589 
4590 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4591 {
4592     struct console_font font;
4593     int rc = -EINVAL;
4594     int c;
4595 
4596     if (op->data) {
4597         font.data = kmalloc(max_font_size, GFP_KERNEL);
4598         if (!font.data)
4599             return -ENOMEM;
4600     } else
4601         font.data = NULL;
4602 
4603     console_lock();
4604     if (vc->vc_mode != KD_TEXT)
4605         rc = -EINVAL;
4606     else if (vc->vc_sw->con_font_get)
4607         rc = vc->vc_sw->con_font_get(vc, &font);
4608     else
4609         rc = -ENOSYS;
4610     console_unlock();
4611 
4612     if (rc)
4613         goto out;
4614 
4615     c = (font.width+7)/8 * 32 * font.charcount;
4616 
4617     if (op->data && font.charcount > op->charcount)
4618         rc = -ENOSPC;
4619     if (font.width > op->width || font.height > op->height)
4620         rc = -ENOSPC;
4621     if (rc)
4622         goto out;
4623 
4624     op->height = font.height;
4625     op->width = font.width;
4626     op->charcount = font.charcount;
4627 
4628     if (op->data && copy_to_user(op->data, font.data, c))
4629         rc = -EFAULT;
4630 
4631 out:
4632     kfree(font.data);
4633     return rc;
4634 }
4635 
4636 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4637 {
4638     struct console_font font;
4639     int rc = -EINVAL;
4640     int size;
4641 
4642     if (vc->vc_mode != KD_TEXT)
4643         return -EINVAL;
4644     if (!op->data)
4645         return -EINVAL;
4646     if (op->charcount > 512)
4647         return -EINVAL;
4648     if (op->width <= 0 || op->width > 32 || !op->height || op->height > 32)
4649         return -EINVAL;
4650     size = (op->width+7)/8 * 32 * op->charcount;
4651     if (size > max_font_size)
4652         return -ENOSPC;
4653 
4654     font.data = memdup_user(op->data, size);
4655     if (IS_ERR(font.data))
4656         return PTR_ERR(font.data);
4657 
4658     font.charcount = op->charcount;
4659     font.width = op->width;
4660     font.height = op->height;
4661 
4662     console_lock();
4663     if (vc->vc_mode != KD_TEXT)
4664         rc = -EINVAL;
4665     else if (vc->vc_sw->con_font_set) {
4666         if (vc_is_sel(vc))
4667             clear_selection();
4668         rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4669     } else
4670         rc = -ENOSYS;
4671     console_unlock();
4672     kfree(font.data);
4673     return rc;
4674 }
4675 
4676 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4677 {
4678     struct console_font font = {.width = op->width, .height = op->height};
4679     char name[MAX_FONT_NAME];
4680     char *s = name;
4681     int rc;
4682 
4683 
4684     if (!op->data)
4685         s = NULL;
4686     else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4687         return -EFAULT;
4688     else
4689         name[MAX_FONT_NAME - 1] = 0;
4690 
4691     console_lock();
4692     if (vc->vc_mode != KD_TEXT) {
4693         console_unlock();
4694         return -EINVAL;
4695     }
4696     if (vc->vc_sw->con_font_default) {
4697         if (vc_is_sel(vc))
4698             clear_selection();
4699         rc = vc->vc_sw->con_font_default(vc, &font, s);
4700     } else
4701         rc = -ENOSYS;
4702     console_unlock();
4703     if (!rc) {
4704         op->width = font.width;
4705         op->height = font.height;
4706     }
4707     return rc;
4708 }
4709 
4710 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4711 {
4712     switch (op->op) {
4713     case KD_FONT_OP_SET:
4714         return con_font_set(vc, op);
4715     case KD_FONT_OP_GET:
4716         return con_font_get(vc, op);
4717     case KD_FONT_OP_SET_DEFAULT:
4718         return con_font_default(vc, op);
4719     case KD_FONT_OP_COPY:
4720         /* was buggy and never really used */
4721         return -EINVAL;
4722     }
4723     return -ENOSYS;
4724 }
4725 
4726 /*
4727  *  Interface exported to selection and vcs.
4728  */
4729 
4730 /* used by selection */
4731 u16 screen_glyph(const struct vc_data *vc, int offset)
4732 {
4733     u16 w = scr_readw(screenpos(vc, offset, true));
4734     u16 c = w & 0xff;
4735 
4736     if (w & vc->vc_hi_font_mask)
4737         c |= 0x100;
4738     return c;
4739 }
4740 EXPORT_SYMBOL_GPL(screen_glyph);
4741 
4742 u32 screen_glyph_unicode(const struct vc_data *vc, int n)
4743 {
4744     struct uni_screen *uniscr = get_vc_uniscr(vc);
4745 
4746     if (uniscr)
4747         return uniscr->lines[n / vc->vc_cols][n % vc->vc_cols];
4748     return inverse_translate(vc, screen_glyph(vc, n * 2), true);
4749 }
4750 EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4751 
4752 /* used by vcs - note the word offset */
4753 unsigned short *screen_pos(const struct vc_data *vc, int w_offset, bool viewed)
4754 {
4755     return screenpos(vc, 2 * w_offset, viewed);
4756 }
4757 EXPORT_SYMBOL_GPL(screen_pos);
4758 
4759 void getconsxy(const struct vc_data *vc, unsigned char xy[static 2])
4760 {
4761     /* clamp values if they don't fit */
4762     xy[0] = min(vc->state.x, 0xFFu);
4763     xy[1] = min(vc->state.y, 0xFFu);
4764 }
4765 
4766 void putconsxy(struct vc_data *vc, unsigned char xy[static const 2])
4767 {
4768     hide_cursor(vc);
4769     gotoxy(vc, xy[0], xy[1]);
4770     set_cursor(vc);
4771 }
4772 
4773 u16 vcs_scr_readw(const struct vc_data *vc, const u16 *org)
4774 {
4775     if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4776         return softcursor_original;
4777     return scr_readw(org);
4778 }
4779 
4780 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4781 {
4782     scr_writew(val, org);
4783     if ((unsigned long)org == vc->vc_pos) {
4784         softcursor_original = -1;
4785         add_softcursor(vc);
4786     }
4787 }
4788 
4789 void vcs_scr_updated(struct vc_data *vc)
4790 {
4791     notify_update(vc);
4792 }
4793 
4794 void vc_scrolldelta_helper(struct vc_data *c, int lines,
4795         unsigned int rolled_over, void *base, unsigned int size)
4796 {
4797     unsigned long ubase = (unsigned long)base;
4798     ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4799     ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4800     ptrdiff_t origin = (void *)c->vc_origin - base;
4801     int margin = c->vc_size_row * 4;
4802     int from, wrap, from_off, avail;
4803 
4804     /* Turn scrollback off */
4805     if (!lines) {
4806         c->vc_visible_origin = c->vc_origin;
4807         return;
4808     }
4809 
4810     /* Do we have already enough to allow jumping from 0 to the end? */
4811     if (rolled_over > scr_end + margin) {
4812         from = scr_end;
4813         wrap = rolled_over + c->vc_size_row;
4814     } else {
4815         from = 0;
4816         wrap = size;
4817     }
4818 
4819     from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4820     avail = (origin - from + wrap) % wrap;
4821 
4822     /* Only a little piece would be left? Show all incl. the piece! */
4823     if (avail < 2 * margin)
4824         margin = 0;
4825     if (from_off < margin)
4826         from_off = 0;
4827     if (from_off > avail - margin)
4828         from_off = avail;
4829 
4830     c->vc_visible_origin = ubase + (from + from_off) % wrap;
4831 }
4832 EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4833 
4834 /*
4835  *  Visible symbols for modules
4836  */
4837 
4838 EXPORT_SYMBOL(color_table);
4839 EXPORT_SYMBOL(default_red);
4840 EXPORT_SYMBOL(default_grn);
4841 EXPORT_SYMBOL(default_blu);
4842 EXPORT_SYMBOL(update_region);
4843 EXPORT_SYMBOL(redraw_screen);
4844 EXPORT_SYMBOL(vc_resize);
4845 EXPORT_SYMBOL(fg_console);
4846 EXPORT_SYMBOL(console_blank_hook);
4847 EXPORT_SYMBOL(console_blanked);
4848 EXPORT_SYMBOL(vc_cons);
4849 EXPORT_SYMBOL(global_cursor_default);
4850 #ifndef VT_SINGLE_DRIVER
4851 EXPORT_SYMBOL(give_up_console);
4852 #endif
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