linux/drivers/tty/vt/vt.c
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   1/*
   2 *  Copyright (C) 1991, 1992  Linus Torvalds
   3 */
   4
   5/*
   6 * Hopefully this will be a rather complete VT102 implementation.
   7 *
   8 * Beeping thanks to John T Kohl.
   9 *
  10 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  11 *   Chars, and VT100 enhancements by Peter MacDonald.
  12 *
  13 * Copy and paste function by Andrew Haylett,
  14 *   some enhancements by Alessandro Rubini.
  15 *
  16 * Code to check for different video-cards mostly by Galen Hunt,
  17 * <g-hunt@ee.utah.edu>
  18 *
  19 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  20 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
  21 *
  22 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
  23 * Resizing of consoles, aeb, 940926
  24 *
  25 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  26 * <poe@daimi.aau.dk>
  27 *
  28 * User-defined bell sound, new setterm control sequences and printk
  29 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
  30 *
  31 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
  32 *
  33 * Merge with the abstract console driver by Geert Uytterhoeven
  34 * <geert@linux-m68k.org>, Jan 1997.
  35 *
  36 *   Original m68k console driver modifications by
  37 *
  38 *     - Arno Griffioen <arno@usn.nl>
  39 *     - David Carter <carter@cs.bris.ac.uk>
  40 * 
  41 *   The abstract console driver provides a generic interface for a text
  42 *   console. It supports VGA text mode, frame buffer based graphical consoles
  43 *   and special graphics processors that are only accessible through some
  44 *   registers (e.g. a TMS340x0 GSP).
  45 *
  46 *   The interface to the hardware is specified using a special structure
  47 *   (struct consw) which contains function pointers to console operations
  48 *   (see <linux/console.h> for more information).
  49 *
  50 * Support for changeable cursor shape
  51 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
  52 *
  53 * Ported to i386 and con_scrolldelta fixed
  54 * by Emmanuel Marty <core@ggi-project.org>, April 1998
  55 *
  56 * Resurrected character buffers in videoram plus lots of other trickery
  57 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  58 *
  59 * Removed old-style timers, introduced console_timer, made timer
  60 * deletion SMP-safe.  17Jun00, Andrew Morton
  61 *
  62 * Removed console_lock, enabled interrupts across all console operations
  63 * 13 March 2001, Andrew Morton
  64 *
  65 * Fixed UTF-8 mode so alternate charset modes always work according
  66 * to control sequences interpreted in do_con_trol function
  67 * preserving backward VT100 semigraphics compatibility,
  68 * malformed UTF sequences represented as sequences of replacement glyphs,
  69 * original codes or '?' as a last resort if replacement glyph is undefined
  70 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
  71 */
  72
  73#include <linux/module.h>
  74#include <linux/types.h>
  75#include <linux/sched.h>
  76#include <linux/tty.h>
  77#include <linux/tty_flip.h>
  78#include <linux/kernel.h>
  79#include <linux/string.h>
  80#include <linux/errno.h>
  81#include <linux/kd.h>
  82#include <linux/slab.h>
  83#include <linux/major.h>
  84#include <linux/mm.h>
  85#include <linux/console.h>
  86#include <linux/init.h>
  87#include <linux/mutex.h>
  88#include <linux/vt_kern.h>
  89#include <linux/selection.h>
  90#include <linux/tiocl.h>
  91#include <linux/kbd_kern.h>
  92#include <linux/consolemap.h>
  93#include <linux/timer.h>
  94#include <linux/interrupt.h>
  95#include <linux/workqueue.h>
  96#include <linux/pm.h>
  97#include <linux/font.h>
  98#include <linux/bitops.h>
  99#include <linux/notifier.h>
 100#include <linux/device.h>
 101#include <linux/io.h>
 102#include <linux/uaccess.h>
 103#include <linux/kdb.h>
 104#include <linux/ctype.h>
 105
 106#define MAX_NR_CON_DRIVER 16
 107
 108#define CON_DRIVER_FLAG_MODULE 1
 109#define CON_DRIVER_FLAG_INIT   2
 110#define CON_DRIVER_FLAG_ATTR   4
 111#define CON_DRIVER_FLAG_ZOMBIE 8
 112
 113struct con_driver {
 114        const struct consw *con;
 115        const char *desc;
 116        struct device *dev;
 117        int node;
 118        int first;
 119        int last;
 120        int flag;
 121};
 122
 123static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 124const struct consw *conswitchp;
 125
 126/* A bitmap for codes <32. A bit of 1 indicates that the code
 127 * corresponding to that bit number invokes some special action
 128 * (such as cursor movement) and should not be displayed as a
 129 * glyph unless the disp_ctrl mode is explicitly enabled.
 130 */
 131#define CTRL_ACTION 0x0d00ff81
 132#define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 133
 134/*
 135 * Here is the default bell parameters: 750HZ, 1/8th of a second
 136 */
 137#define DEFAULT_BELL_PITCH      750
 138#define DEFAULT_BELL_DURATION   (HZ/8)
 139#define DEFAULT_CURSOR_BLINK_MS 200
 140
 141struct vc vc_cons [MAX_NR_CONSOLES];
 142
 143#ifndef VT_SINGLE_DRIVER
 144static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 145#endif
 146
 147static int con_open(struct tty_struct *, struct file *);
 148static void vc_init(struct vc_data *vc, unsigned int rows,
 149                    unsigned int cols, int do_clear);
 150static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 151static void save_cur(struct vc_data *vc);
 152static void reset_terminal(struct vc_data *vc, int do_clear);
 153static void con_flush_chars(struct tty_struct *tty);
 154static int set_vesa_blanking(char __user *p);
 155static void set_cursor(struct vc_data *vc);
 156static void hide_cursor(struct vc_data *vc);
 157static void console_callback(struct work_struct *ignored);
 158static void con_driver_unregister_callback(struct work_struct *ignored);
 159static void blank_screen_t(unsigned long dummy);
 160static void set_palette(struct vc_data *vc);
 161
 162#define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
 163
 164static int printable;           /* Is console ready for printing? */
 165int default_utf8 = true;
 166module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 167int global_cursor_default = -1;
 168module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
 169
 170static int cur_default = CUR_DEFAULT;
 171module_param(cur_default, int, S_IRUGO | S_IWUSR);
 172
 173/*
 174 * ignore_poke: don't unblank the screen when things are typed.  This is
 175 * mainly for the privacy of braille terminal users.
 176 */
 177static int ignore_poke;
 178
 179int do_poke_blanked_console;
 180int console_blanked;
 181
 182static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 183static int vesa_off_interval;
 184static int blankinterval = 10*60;
 185core_param(consoleblank, blankinterval, int, 0444);
 186
 187static DECLARE_WORK(console_work, console_callback);
 188static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
 189
 190/*
 191 * fg_console is the current virtual console,
 192 * last_console is the last used one,
 193 * want_console is the console we want to switch to,
 194 * saved_* variants are for save/restore around kernel debugger enter/leave
 195 */
 196int fg_console;
 197int last_console;
 198int want_console = -1;
 199static int saved_fg_console;
 200static int saved_last_console;
 201static int saved_want_console;
 202static int saved_vc_mode;
 203static int saved_console_blanked;
 204
 205/*
 206 * For each existing display, we have a pointer to console currently visible
 207 * on that display, allowing consoles other than fg_console to be refreshed
 208 * appropriately. Unless the low-level driver supplies its own display_fg
 209 * variable, we use this one for the "master display".
 210 */
 211static struct vc_data *master_display_fg;
 212
 213/*
 214 * Unfortunately, we need to delay tty echo when we're currently writing to the
 215 * console since the code is (and always was) not re-entrant, so we schedule
 216 * all flip requests to process context with schedule-task() and run it from
 217 * console_callback().
 218 */
 219
 220/*
 221 * For the same reason, we defer scrollback to the console callback.
 222 */
 223static int scrollback_delta;
 224
 225/*
 226 * Hook so that the power management routines can (un)blank
 227 * the console on our behalf.
 228 */
 229int (*console_blank_hook)(int);
 230
 231static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 232static int blank_state;
 233static int blank_timer_expired;
 234enum {
 235        blank_off = 0,
 236        blank_normal_wait,
 237        blank_vesa_wait,
 238};
 239
 240/*
 241 * /sys/class/tty/tty0/
 242 *
 243 * the attribute 'active' contains the name of the current vc
 244 * console and it supports poll() to detect vc switches
 245 */
 246static struct device *tty0dev;
 247
 248/*
 249 * Notifier list for console events.
 250 */
 251static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 252
 253int register_vt_notifier(struct notifier_block *nb)
 254{
 255        return atomic_notifier_chain_register(&vt_notifier_list, nb);
 256}
 257EXPORT_SYMBOL_GPL(register_vt_notifier);
 258
 259int unregister_vt_notifier(struct notifier_block *nb)
 260{
 261        return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 262}
 263EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 264
 265static void notify_write(struct vc_data *vc, unsigned int unicode)
 266{
 267        struct vt_notifier_param param = { .vc = vc, .c = unicode };
 268        atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 269}
 270
 271static void notify_update(struct vc_data *vc)
 272{
 273        struct vt_notifier_param param = { .vc = vc };
 274        atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 275}
 276/*
 277 *      Low-Level Functions
 278 */
 279
 280#define IS_FG(vc)       ((vc)->vc_num == fg_console)
 281
 282#ifdef VT_BUF_VRAM_ONLY
 283#define DO_UPDATE(vc)   0
 284#else
 285#define DO_UPDATE(vc)   (CON_IS_VISIBLE(vc) && !console_blanked)
 286#endif
 287
 288static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 289{
 290        unsigned short *p;
 291        
 292        if (!viewed)
 293                p = (unsigned short *)(vc->vc_origin + offset);
 294        else if (!vc->vc_sw->con_screen_pos)
 295                p = (unsigned short *)(vc->vc_visible_origin + offset);
 296        else
 297                p = vc->vc_sw->con_screen_pos(vc, offset);
 298        return p;
 299}
 300
 301/* Called  from the keyboard irq path.. */
 302static inline void scrolldelta(int lines)
 303{
 304        /* FIXME */
 305        /* scrolldelta needs some kind of consistency lock, but the BKL was
 306           and still is not protecting versus the scheduled back end */
 307        scrollback_delta += lines;
 308        schedule_console_callback();
 309}
 310
 311void schedule_console_callback(void)
 312{
 313        schedule_work(&console_work);
 314}
 315
 316static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 317{
 318        unsigned short *d, *s;
 319
 320        if (t+nr >= b)
 321                nr = b - t - 1;
 322        if (b > vc->vc_rows || t >= b || nr < 1)
 323                return;
 324        if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 325                return;
 326        d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 327        s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 328        scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 329        scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
 330                    vc->vc_size_row * nr);
 331}
 332
 333static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 334{
 335        unsigned short *s;
 336        unsigned int step;
 337
 338        if (t+nr >= b)
 339                nr = b - t - 1;
 340        if (b > vc->vc_rows || t >= b || nr < 1)
 341                return;
 342        if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
 343                return;
 344        s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 345        step = vc->vc_cols * nr;
 346        scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
 347        scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
 348}
 349
 350static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 351{
 352#ifndef VT_BUF_VRAM_ONLY
 353        unsigned int xx, yy, offset;
 354        u16 *p;
 355
 356        p = (u16 *) start;
 357        if (!vc->vc_sw->con_getxy) {
 358                offset = (start - vc->vc_origin) / 2;
 359                xx = offset % vc->vc_cols;
 360                yy = offset / vc->vc_cols;
 361        } else {
 362                int nxx, nyy;
 363                start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 364                xx = nxx; yy = nyy;
 365        }
 366        for(;;) {
 367                u16 attrib = scr_readw(p) & 0xff00;
 368                int startx = xx;
 369                u16 *q = p;
 370                while (xx < vc->vc_cols && count) {
 371                        if (attrib != (scr_readw(p) & 0xff00)) {
 372                                if (p > q)
 373                                        vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 374                                startx = xx;
 375                                q = p;
 376                                attrib = scr_readw(p) & 0xff00;
 377                        }
 378                        p++;
 379                        xx++;
 380                        count--;
 381                }
 382                if (p > q)
 383                        vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 384                if (!count)
 385                        break;
 386                xx = 0;
 387                yy++;
 388                if (vc->vc_sw->con_getxy) {
 389                        p = (u16 *)start;
 390                        start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 391                }
 392        }
 393#endif
 394}
 395
 396void update_region(struct vc_data *vc, unsigned long start, int count)
 397{
 398        WARN_CONSOLE_UNLOCKED();
 399
 400        if (DO_UPDATE(vc)) {
 401                hide_cursor(vc);
 402                do_update_region(vc, start, count);
 403                set_cursor(vc);
 404        }
 405}
 406
 407/* Structure of attributes is hardware-dependent */
 408
 409static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 410    u8 _underline, u8 _reverse, u8 _italic)
 411{
 412        if (vc->vc_sw->con_build_attr)
 413                return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 414                       _blink, _underline, _reverse, _italic);
 415
 416#ifndef VT_BUF_VRAM_ONLY
 417/*
 418 * ++roman: I completely changed the attribute format for monochrome
 419 * mode (!can_do_color). The formerly used MDA (monochrome display
 420 * adapter) format didn't allow the combination of certain effects.
 421 * Now the attribute is just a bit vector:
 422 *  Bit 0..1: intensity (0..2)
 423 *  Bit 2   : underline
 424 *  Bit 3   : reverse
 425 *  Bit 7   : blink
 426 */
 427        {
 428        u8 a = _color;
 429        if (!vc->vc_can_do_color)
 430                return _intensity |
 431                       (_italic ? 2 : 0) |
 432                       (_underline ? 4 : 0) |
 433                       (_reverse ? 8 : 0) |
 434                       (_blink ? 0x80 : 0);
 435        if (_italic)
 436                a = (a & 0xF0) | vc->vc_itcolor;
 437        else if (_underline)
 438                a = (a & 0xf0) | vc->vc_ulcolor;
 439        else if (_intensity == 0)
 440                a = (a & 0xf0) | vc->vc_ulcolor;
 441        if (_reverse)
 442                a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 443        if (_blink)
 444                a ^= 0x80;
 445        if (_intensity == 2)
 446                a ^= 0x08;
 447        if (vc->vc_hi_font_mask == 0x100)
 448                a <<= 1;
 449        return a;
 450        }
 451#else
 452        return 0;
 453#endif
 454}
 455
 456static void update_attr(struct vc_data *vc)
 457{
 458        vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 459                      vc->vc_blink, vc->vc_underline,
 460                      vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 461        vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 462}
 463
 464/* Note: inverting the screen twice should revert to the original state */
 465void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 466{
 467        unsigned short *p;
 468
 469        WARN_CONSOLE_UNLOCKED();
 470
 471        count /= 2;
 472        p = screenpos(vc, offset, viewed);
 473        if (vc->vc_sw->con_invert_region)
 474                vc->vc_sw->con_invert_region(vc, p, count);
 475#ifndef VT_BUF_VRAM_ONLY
 476        else {
 477                u16 *q = p;
 478                int cnt = count;
 479                u16 a;
 480
 481                if (!vc->vc_can_do_color) {
 482                        while (cnt--) {
 483                            a = scr_readw(q);
 484                            a ^= 0x0800;
 485                            scr_writew(a, q);
 486                            q++;
 487                        }
 488                } else if (vc->vc_hi_font_mask == 0x100) {
 489                        while (cnt--) {
 490                                a = scr_readw(q);
 491                                a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 492                                scr_writew(a, q);
 493                                q++;
 494                        }
 495                } else {
 496                        while (cnt--) {
 497                                a = scr_readw(q);
 498                                a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 499                                scr_writew(a, q);
 500                                q++;
 501                        }
 502                }
 503        }
 504#endif
 505        if (DO_UPDATE(vc))
 506                do_update_region(vc, (unsigned long) p, count);
 507        notify_update(vc);
 508}
 509
 510/* used by selection: complement pointer position */
 511void complement_pos(struct vc_data *vc, int offset)
 512{
 513        static int old_offset = -1;
 514        static unsigned short old;
 515        static unsigned short oldx, oldy;
 516
 517        WARN_CONSOLE_UNLOCKED();
 518
 519        if (old_offset != -1 && old_offset >= 0 &&
 520            old_offset < vc->vc_screenbuf_size) {
 521                scr_writew(old, screenpos(vc, old_offset, 1));
 522                if (DO_UPDATE(vc))
 523                        vc->vc_sw->con_putc(vc, old, oldy, oldx);
 524                notify_update(vc);
 525        }
 526
 527        old_offset = offset;
 528
 529        if (offset != -1 && offset >= 0 &&
 530            offset < vc->vc_screenbuf_size) {
 531                unsigned short new;
 532                unsigned short *p;
 533                p = screenpos(vc, offset, 1);
 534                old = scr_readw(p);
 535                new = old ^ vc->vc_complement_mask;
 536                scr_writew(new, p);
 537                if (DO_UPDATE(vc)) {
 538                        oldx = (offset >> 1) % vc->vc_cols;
 539                        oldy = (offset >> 1) / vc->vc_cols;
 540                        vc->vc_sw->con_putc(vc, new, oldy, oldx);
 541                }
 542                notify_update(vc);
 543        }
 544}
 545
 546static void insert_char(struct vc_data *vc, unsigned int nr)
 547{
 548        unsigned short *p = (unsigned short *) vc->vc_pos;
 549
 550        scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
 551        scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 552        vc->vc_need_wrap = 0;
 553        if (DO_UPDATE(vc))
 554                do_update_region(vc, (unsigned long) p,
 555                        vc->vc_cols - vc->vc_x);
 556}
 557
 558static void delete_char(struct vc_data *vc, unsigned int nr)
 559{
 560        unsigned short *p = (unsigned short *) vc->vc_pos;
 561
 562        scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
 563        scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
 564                        nr * 2);
 565        vc->vc_need_wrap = 0;
 566        if (DO_UPDATE(vc))
 567                do_update_region(vc, (unsigned long) p,
 568                        vc->vc_cols - vc->vc_x);
 569}
 570
 571static int softcursor_original;
 572
 573static void add_softcursor(struct vc_data *vc)
 574{
 575        int i = scr_readw((u16 *) vc->vc_pos);
 576        u32 type = vc->vc_cursor_type;
 577
 578        if (! (type & 0x10)) return;
 579        if (softcursor_original != -1) return;
 580        softcursor_original = i;
 581        i |= ((type >> 8) & 0xff00 );
 582        i ^= ((type) & 0xff00 );
 583        if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 584        if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 585        scr_writew(i, (u16 *) vc->vc_pos);
 586        if (DO_UPDATE(vc))
 587                vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 588}
 589
 590static void hide_softcursor(struct vc_data *vc)
 591{
 592        if (softcursor_original != -1) {
 593                scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 594                if (DO_UPDATE(vc))
 595                        vc->vc_sw->con_putc(vc, softcursor_original,
 596                                        vc->vc_y, vc->vc_x);
 597                softcursor_original = -1;
 598        }
 599}
 600
 601static void hide_cursor(struct vc_data *vc)
 602{
 603        if (vc == sel_cons)
 604                clear_selection();
 605        vc->vc_sw->con_cursor(vc, CM_ERASE);
 606        hide_softcursor(vc);
 607}
 608
 609static void set_cursor(struct vc_data *vc)
 610{
 611        if (!IS_FG(vc) || console_blanked ||
 612            vc->vc_mode == KD_GRAPHICS)
 613                return;
 614        if (vc->vc_deccm) {
 615                if (vc == sel_cons)
 616                        clear_selection();
 617                add_softcursor(vc);
 618                if ((vc->vc_cursor_type & 0x0f) != 1)
 619                        vc->vc_sw->con_cursor(vc, CM_DRAW);
 620        } else
 621                hide_cursor(vc);
 622}
 623
 624static void set_origin(struct vc_data *vc)
 625{
 626        WARN_CONSOLE_UNLOCKED();
 627
 628        if (!CON_IS_VISIBLE(vc) ||
 629            !vc->vc_sw->con_set_origin ||
 630            !vc->vc_sw->con_set_origin(vc))
 631                vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 632        vc->vc_visible_origin = vc->vc_origin;
 633        vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 634        vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 635}
 636
 637static inline void save_screen(struct vc_data *vc)
 638{
 639        WARN_CONSOLE_UNLOCKED();
 640
 641        if (vc->vc_sw->con_save_screen)
 642                vc->vc_sw->con_save_screen(vc);
 643}
 644
 645/*
 646 *      Redrawing of screen
 647 */
 648
 649void clear_buffer_attributes(struct vc_data *vc)
 650{
 651        unsigned short *p = (unsigned short *)vc->vc_origin;
 652        int count = vc->vc_screenbuf_size / 2;
 653        int mask = vc->vc_hi_font_mask | 0xff;
 654
 655        for (; count > 0; count--, p++) {
 656                scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 657        }
 658}
 659
 660void redraw_screen(struct vc_data *vc, int is_switch)
 661{
 662        int redraw = 0;
 663
 664        WARN_CONSOLE_UNLOCKED();
 665
 666        if (!vc) {
 667                /* strange ... */
 668                /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 669                return;
 670        }
 671
 672        if (is_switch) {
 673                struct vc_data *old_vc = vc_cons[fg_console].d;
 674                if (old_vc == vc)
 675                        return;
 676                if (!CON_IS_VISIBLE(vc))
 677                        redraw = 1;
 678                *vc->vc_display_fg = vc;
 679                fg_console = vc->vc_num;
 680                hide_cursor(old_vc);
 681                if (!CON_IS_VISIBLE(old_vc)) {
 682                        save_screen(old_vc);
 683                        set_origin(old_vc);
 684                }
 685                if (tty0dev)
 686                        sysfs_notify(&tty0dev->kobj, NULL, "active");
 687        } else {
 688                hide_cursor(vc);
 689                redraw = 1;
 690        }
 691
 692        if (redraw) {
 693                int update;
 694                int old_was_color = vc->vc_can_do_color;
 695
 696                set_origin(vc);
 697                update = vc->vc_sw->con_switch(vc);
 698                set_palette(vc);
 699                /*
 700                 * If console changed from mono<->color, the best we can do
 701                 * is to clear the buffer attributes. As it currently stands,
 702                 * rebuilding new attributes from the old buffer is not doable
 703                 * without overly complex code.
 704                 */
 705                if (old_was_color != vc->vc_can_do_color) {
 706                        update_attr(vc);
 707                        clear_buffer_attributes(vc);
 708                }
 709
 710                /* Forcibly update if we're panicing */
 711                if ((update && vc->vc_mode != KD_GRAPHICS) ||
 712                    vt_force_oops_output(vc))
 713                        do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 714        }
 715        set_cursor(vc);
 716        if (is_switch) {
 717                set_leds();
 718                compute_shiftstate();
 719                notify_update(vc);
 720        }
 721}
 722
 723/*
 724 *      Allocation, freeing and resizing of VTs.
 725 */
 726
 727int vc_cons_allocated(unsigned int i)
 728{
 729        return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 730}
 731
 732static void visual_init(struct vc_data *vc, int num, int init)
 733{
 734        /* ++Geert: vc->vc_sw->con_init determines console size */
 735        if (vc->vc_sw)
 736                module_put(vc->vc_sw->owner);
 737        vc->vc_sw = conswitchp;
 738#ifndef VT_SINGLE_DRIVER
 739        if (con_driver_map[num])
 740                vc->vc_sw = con_driver_map[num];
 741#endif
 742        __module_get(vc->vc_sw->owner);
 743        vc->vc_num = num;
 744        vc->vc_display_fg = &master_display_fg;
 745        if (vc->vc_uni_pagedir_loc)
 746                con_free_unimap(vc);
 747        vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 748        vc->vc_uni_pagedir = NULL;
 749        vc->vc_hi_font_mask = 0;
 750        vc->vc_complement_mask = 0;
 751        vc->vc_can_do_color = 0;
 752        vc->vc_panic_force_write = false;
 753        vc->vc_sw->con_init(vc, init);
 754        if (!vc->vc_complement_mask)
 755                vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 756        vc->vc_s_complement_mask = vc->vc_complement_mask;
 757        vc->vc_size_row = vc->vc_cols << 1;
 758        vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 759}
 760
 761int vc_allocate(unsigned int currcons)  /* return 0 on success */
 762{
 763        WARN_CONSOLE_UNLOCKED();
 764
 765        if (currcons >= MAX_NR_CONSOLES)
 766                return -ENXIO;
 767        if (!vc_cons[currcons].d) {
 768            struct vc_data *vc;
 769            struct vt_notifier_param param;
 770
 771            /* prevent users from taking too much memory */
 772            if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
 773              return -EPERM;
 774
 775            /* due to the granularity of kmalloc, we waste some memory here */
 776            /* the alloc is done in two steps, to optimize the common situation
 777               of a 25x80 console (structsize=216, screenbuf_size=4000) */
 778            /* although the numbers above are not valid since long ago, the
 779               point is still up-to-date and the comment still has its value
 780               even if only as a historical artifact.  --mj, July 1998 */
 781            param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 782            if (!vc)
 783                return -ENOMEM;
 784            vc_cons[currcons].d = vc;
 785            tty_port_init(&vc->port);
 786            INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 787            visual_init(vc, currcons, 1);
 788            if (!*vc->vc_uni_pagedir_loc)
 789                con_set_default_unimap(vc);
 790            vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 791            if (!vc->vc_screenbuf) {
 792                kfree(vc);
 793                vc_cons[currcons].d = NULL;
 794                return -ENOMEM;
 795            }
 796
 797            /* If no drivers have overridden us and the user didn't pass a
 798               boot option, default to displaying the cursor */
 799            if (global_cursor_default == -1)
 800                    global_cursor_default = 1;
 801
 802            vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 803            vcs_make_sysfs(currcons);
 804            atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 805        }
 806        return 0;
 807}
 808
 809static inline int resize_screen(struct vc_data *vc, int width, int height,
 810                                int user)
 811{
 812        /* Resizes the resolution of the display adapater */
 813        int err = 0;
 814
 815        if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 816                err = vc->vc_sw->con_resize(vc, width, height, user);
 817
 818        return err;
 819}
 820
 821/*
 822 * Change # of rows and columns (0 means unchanged/the size of fg_console)
 823 * [this is to be used together with some user program
 824 * like resize that changes the hardware videomode]
 825 */
 826#define VC_RESIZE_MAXCOL (32767)
 827#define VC_RESIZE_MAXROW (32767)
 828
 829/**
 830 *      vc_do_resize    -       resizing method for the tty
 831 *      @tty: tty being resized
 832 *      @real_tty: real tty (different to tty if a pty/tty pair)
 833 *      @vc: virtual console private data
 834 *      @cols: columns
 835 *      @lines: lines
 836 *
 837 *      Resize a virtual console, clipping according to the actual constraints.
 838 *      If the caller passes a tty structure then update the termios winsize
 839 *      information and perform any necessary signal handling.
 840 *
 841 *      Caller must hold the console semaphore. Takes the termios rwsem and
 842 *      ctrl_lock of the tty IFF a tty is passed.
 843 */
 844
 845static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 846                                unsigned int cols, unsigned int lines)
 847{
 848        unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 849        unsigned long end;
 850        unsigned int old_rows, old_row_size;
 851        unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 852        unsigned int user;
 853        unsigned short *newscreen;
 854
 855        WARN_CONSOLE_UNLOCKED();
 856
 857        if (!vc)
 858                return -ENXIO;
 859
 860        user = vc->vc_resize_user;
 861        vc->vc_resize_user = 0;
 862
 863        if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 864                return -EINVAL;
 865
 866        new_cols = (cols ? cols : vc->vc_cols);
 867        new_rows = (lines ? lines : vc->vc_rows);
 868        new_row_size = new_cols << 1;
 869        new_screen_size = new_row_size * new_rows;
 870
 871        if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 872                return 0;
 873
 874        newscreen = kmalloc(new_screen_size, GFP_USER);
 875        if (!newscreen)
 876                return -ENOMEM;
 877
 878        old_rows = vc->vc_rows;
 879        old_row_size = vc->vc_size_row;
 880
 881        err = resize_screen(vc, new_cols, new_rows, user);
 882        if (err) {
 883                kfree(newscreen);
 884                return err;
 885        }
 886
 887        vc->vc_rows = new_rows;
 888        vc->vc_cols = new_cols;
 889        vc->vc_size_row = new_row_size;
 890        vc->vc_screenbuf_size = new_screen_size;
 891
 892        rlth = min(old_row_size, new_row_size);
 893        rrem = new_row_size - rlth;
 894        old_origin = vc->vc_origin;
 895        new_origin = (long) newscreen;
 896        new_scr_end = new_origin + new_screen_size;
 897
 898        if (vc->vc_y > new_rows) {
 899                if (old_rows - vc->vc_y < new_rows) {
 900                        /*
 901                         * Cursor near the bottom, copy contents from the
 902                         * bottom of buffer
 903                         */
 904                        old_origin += (old_rows - new_rows) * old_row_size;
 905                } else {
 906                        /*
 907                         * Cursor is in no man's land, copy 1/2 screenful
 908                         * from the top and bottom of cursor position
 909                         */
 910                        old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 911                }
 912        }
 913
 914        end = old_origin + old_row_size * min(old_rows, new_rows);
 915
 916        update_attr(vc);
 917
 918        while (old_origin < end) {
 919                scr_memcpyw((unsigned short *) new_origin,
 920                            (unsigned short *) old_origin, rlth);
 921                if (rrem)
 922                        scr_memsetw((void *)(new_origin + rlth),
 923                                    vc->vc_video_erase_char, rrem);
 924                old_origin += old_row_size;
 925                new_origin += new_row_size;
 926        }
 927        if (new_scr_end > new_origin)
 928                scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 929                            new_scr_end - new_origin);
 930        kfree(vc->vc_screenbuf);
 931        vc->vc_screenbuf = newscreen;
 932        vc->vc_screenbuf_size = new_screen_size;
 933        set_origin(vc);
 934
 935        /* do part of a reset_terminal() */
 936        vc->vc_top = 0;
 937        vc->vc_bottom = vc->vc_rows;
 938        gotoxy(vc, vc->vc_x, vc->vc_y);
 939        save_cur(vc);
 940
 941        if (tty) {
 942                /* Rewrite the requested winsize data with the actual
 943                   resulting sizes */
 944                struct winsize ws;
 945                memset(&ws, 0, sizeof(ws));
 946                ws.ws_row = vc->vc_rows;
 947                ws.ws_col = vc->vc_cols;
 948                ws.ws_ypixel = vc->vc_scan_lines;
 949                tty_do_resize(tty, &ws);
 950        }
 951
 952        if (CON_IS_VISIBLE(vc))
 953                update_screen(vc);
 954        vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 955        return err;
 956}
 957
 958/**
 959 *      vc_resize               -       resize a VT
 960 *      @vc: virtual console
 961 *      @cols: columns
 962 *      @rows: rows
 963 *
 964 *      Resize a virtual console as seen from the console end of things. We
 965 *      use the common vc_do_resize methods to update the structures. The
 966 *      caller must hold the console sem to protect console internals and
 967 *      vc->port.tty
 968 */
 969
 970int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 971{
 972        return vc_do_resize(vc->port.tty, vc, cols, rows);
 973}
 974
 975/**
 976 *      vt_resize               -       resize a VT
 977 *      @tty: tty to resize
 978 *      @ws: winsize attributes
 979 *
 980 *      Resize a virtual terminal. This is called by the tty layer as we
 981 *      register our own handler for resizing. The mutual helper does all
 982 *      the actual work.
 983 *
 984 *      Takes the console sem and the called methods then take the tty
 985 *      termios_rwsem and the tty ctrl_lock in that order.
 986 */
 987static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 988{
 989        struct vc_data *vc = tty->driver_data;
 990        int ret;
 991
 992        console_lock();
 993        ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
 994        console_unlock();
 995        return ret;
 996}
 997
 998struct vc_data *vc_deallocate(unsigned int currcons)
 999{
1000        struct vc_data *vc = NULL;
1001
1002        WARN_CONSOLE_UNLOCKED();
1003
1004        if (vc_cons_allocated(currcons)) {
1005                struct vt_notifier_param param;
1006
1007                param.vc = vc = vc_cons[currcons].d;
1008                atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1009                vcs_remove_sysfs(currcons);
1010                vc->vc_sw->con_deinit(vc);
1011                put_pid(vc->vt_pid);
1012                module_put(vc->vc_sw->owner);
1013                kfree(vc->vc_screenbuf);
1014                vc_cons[currcons].d = NULL;
1015        }
1016        return vc;
1017}
1018
1019/*
1020 *      VT102 emulator
1021 */
1022
1023#define set_kbd(vc, x)  vt_set_kbd_mode_bit((vc)->vc_num, (x))
1024#define clr_kbd(vc, x)  vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1025#define is_kbd(vc, x)   vt_get_kbd_mode_bit((vc)->vc_num, (x))
1026
1027#define decarm          VC_REPEAT
1028#define decckm          VC_CKMODE
1029#define kbdapplic       VC_APPLIC
1030#define lnm             VC_CRLF
1031
1032/*
1033 * this is what the terminal answers to a ESC-Z or csi0c query.
1034 */
1035#define VT100ID "\033[?1;2c"
1036#define VT102ID "\033[?6c"
1037
1038unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1039                                       8,12,10,14, 9,13,11,15 };
1040
1041/* the default colour table, for VGA+ colour systems */
1042int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1043    0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1044int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1045    0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1046int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1047    0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1048
1049module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1050module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1051module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1052
1053/*
1054 * gotoxy() must verify all boundaries, because the arguments
1055 * might also be negative. If the given position is out of
1056 * bounds, the cursor is placed at the nearest margin.
1057 */
1058static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1059{
1060        int min_y, max_y;
1061
1062        if (new_x < 0)
1063                vc->vc_x = 0;
1064        else {
1065                if (new_x >= vc->vc_cols)
1066                        vc->vc_x = vc->vc_cols - 1;
1067                else
1068                        vc->vc_x = new_x;
1069        }
1070
1071        if (vc->vc_decom) {
1072                min_y = vc->vc_top;
1073                max_y = vc->vc_bottom;
1074        } else {
1075                min_y = 0;
1076                max_y = vc->vc_rows;
1077        }
1078        if (new_y < min_y)
1079                vc->vc_y = min_y;
1080        else if (new_y >= max_y)
1081                vc->vc_y = max_y - 1;
1082        else
1083                vc->vc_y = new_y;
1084        vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1085        vc->vc_need_wrap = 0;
1086}
1087
1088/* for absolute user moves, when decom is set */
1089static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1090{
1091        gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1092}
1093
1094void scrollback(struct vc_data *vc, int lines)
1095{
1096        if (!lines)
1097                lines = vc->vc_rows / 2;
1098        scrolldelta(-lines);
1099}
1100
1101void scrollfront(struct vc_data *vc, int lines)
1102{
1103        if (!lines)
1104                lines = vc->vc_rows / 2;
1105        scrolldelta(lines);
1106}
1107
1108static void lf(struct vc_data *vc)
1109{
1110        /* don't scroll if above bottom of scrolling region, or
1111         * if below scrolling region
1112         */
1113        if (vc->vc_y + 1 == vc->vc_bottom)
1114                scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1115        else if (vc->vc_y < vc->vc_rows - 1) {
1116                vc->vc_y++;
1117                vc->vc_pos += vc->vc_size_row;
1118        }
1119        vc->vc_need_wrap = 0;
1120        notify_write(vc, '\n');
1121}
1122
1123static void ri(struct vc_data *vc)
1124{
1125        /* don't scroll if below top of scrolling region, or
1126         * if above scrolling region
1127         */
1128        if (vc->vc_y == vc->vc_top)
1129                scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1130        else if (vc->vc_y > 0) {
1131                vc->vc_y--;
1132                vc->vc_pos -= vc->vc_size_row;
1133        }
1134        vc->vc_need_wrap = 0;
1135}
1136
1137static inline void cr(struct vc_data *vc)
1138{
1139        vc->vc_pos -= vc->vc_x << 1;
1140        vc->vc_need_wrap = vc->vc_x = 0;
1141        notify_write(vc, '\r');
1142}
1143
1144static inline void bs(struct vc_data *vc)
1145{
1146        if (vc->vc_x) {
1147                vc->vc_pos -= 2;
1148                vc->vc_x--;
1149                vc->vc_need_wrap = 0;
1150                notify_write(vc, '\b');
1151        }
1152}
1153
1154static inline void del(struct vc_data *vc)
1155{
1156        /* ignored */
1157}
1158
1159static void csi_J(struct vc_data *vc, int vpar)
1160{
1161        unsigned int count;
1162        unsigned short * start;
1163
1164        switch (vpar) {
1165                case 0: /* erase from cursor to end of display */
1166                        count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1167                        start = (unsigned short *)vc->vc_pos;
1168                        break;
1169                case 1: /* erase from start to cursor */
1170                        count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1171                        start = (unsigned short *)vc->vc_origin;
1172                        break;
1173                case 3: /* erase scroll-back buffer (and whole display) */
1174                        scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1175                                    vc->vc_screenbuf_size >> 1);
1176                        set_origin(vc);
1177                        if (CON_IS_VISIBLE(vc))
1178                                update_screen(vc);
1179                        /* fall through */
1180                case 2: /* erase whole display */
1181                        count = vc->vc_cols * vc->vc_rows;
1182                        start = (unsigned short *)vc->vc_origin;
1183                        break;
1184                default:
1185                        return;
1186        }
1187        scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1188        if (DO_UPDATE(vc))
1189                do_update_region(vc, (unsigned long) start, count);
1190        vc->vc_need_wrap = 0;
1191}
1192
1193static void csi_K(struct vc_data *vc, int vpar)
1194{
1195        unsigned int count;
1196        unsigned short * start;
1197
1198        switch (vpar) {
1199                case 0: /* erase from cursor to end of line */
1200                        count = vc->vc_cols - vc->vc_x;
1201                        start = (unsigned short *)vc->vc_pos;
1202                        break;
1203                case 1: /* erase from start of line to cursor */
1204                        start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1205                        count = vc->vc_x + 1;
1206                        break;
1207                case 2: /* erase whole line */
1208                        start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1209                        count = vc->vc_cols;
1210                        break;
1211                default:
1212                        return;
1213        }
1214        scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1215        vc->vc_need_wrap = 0;
1216        if (DO_UPDATE(vc))
1217                do_update_region(vc, (unsigned long) start, count);
1218}
1219
1220static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1221{                                         /* not vt100? */
1222        int count;
1223
1224        if (!vpar)
1225                vpar++;
1226        count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1227
1228        scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1229        if (DO_UPDATE(vc))
1230                vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1231        vc->vc_need_wrap = 0;
1232}
1233
1234static void default_attr(struct vc_data *vc)
1235{
1236        vc->vc_intensity = 1;
1237        vc->vc_italic = 0;
1238        vc->vc_underline = 0;
1239        vc->vc_reverse = 0;
1240        vc->vc_blink = 0;
1241        vc->vc_color = vc->vc_def_color;
1242}
1243
1244struct rgb { u8 r; u8 g; u8 b; };
1245
1246static struct rgb rgb_from_256(int i)
1247{
1248        struct rgb c;
1249        if (i < 8) {            /* Standard colours. */
1250                c.r = i&1 ? 0xaa : 0x00;
1251                c.g = i&2 ? 0xaa : 0x00;
1252                c.b = i&4 ? 0xaa : 0x00;
1253        } else if (i < 16) {
1254                c.r = i&1 ? 0xff : 0x55;
1255                c.g = i&2 ? 0xff : 0x55;
1256                c.b = i&4 ? 0xff : 0x55;
1257        } else if (i < 232) {   /* 6x6x6 colour cube. */
1258                c.r = (i - 16) / 36 * 85 / 2;
1259                c.g = (i - 16) / 6 % 6 * 85 / 2;
1260                c.b = (i - 16) % 6 * 85 / 2;
1261        } else                  /* Grayscale ramp. */
1262                c.r = c.g = c.b = i * 10 - 2312;
1263        return c;
1264}
1265
1266static void rgb_foreground(struct vc_data *vc, struct rgb c)
1267{
1268        u8 hue, max = c.r;
1269        if (c.g > max)
1270                max = c.g;
1271        if (c.b > max)
1272                max = c.b;
1273        hue = (c.r > max/2 ? 4 : 0)
1274            | (c.g > max/2 ? 2 : 0)
1275            | (c.b > max/2 ? 1 : 0);
1276        if (hue == 7 && max <= 0x55)
1277                hue = 0, vc->vc_intensity = 2;
1278        else
1279                vc->vc_intensity = (max > 0xaa) + 1;
1280        vc->vc_color = (vc->vc_color & 0xf0) | hue;
1281}
1282
1283static void rgb_background(struct vc_data *vc, struct rgb c)
1284{
1285        /* For backgrounds, err on the dark side. */
1286        vc->vc_color = (vc->vc_color & 0x0f)
1287                | (c.r&0x80) >> 1 | (c.g&0x80) >> 2 | (c.b&0x80) >> 3;
1288}
1289
1290/* console_lock is held */
1291static void csi_m(struct vc_data *vc)
1292{
1293        int i;
1294
1295        for (i = 0; i <= vc->vc_npar; i++)
1296                switch (vc->vc_par[i]) {
1297                        case 0: /* all attributes off */
1298                                default_attr(vc);
1299                                break;
1300                        case 1:
1301                                vc->vc_intensity = 2;
1302                                break;
1303                        case 2:
1304                                vc->vc_intensity = 0;
1305                                break;
1306                        case 3:
1307                                vc->vc_italic = 1;
1308                                break;
1309                        case 4:
1310                                vc->vc_underline = 1;
1311                                break;
1312                        case 5:
1313                                vc->vc_blink = 1;
1314                                break;
1315                        case 7:
1316                                vc->vc_reverse = 1;
1317                                break;
1318                        case 10: /* ANSI X3.64-1979 (SCO-ish?)
1319                                  * Select primary font, don't display
1320                                  * control chars if defined, don't set
1321                                  * bit 8 on output.
1322                                  */
1323                                vc->vc_translate = set_translate(vc->vc_charset == 0
1324                                                ? vc->vc_G0_charset
1325                                                : vc->vc_G1_charset, vc);
1326                                vc->vc_disp_ctrl = 0;
1327                                vc->vc_toggle_meta = 0;
1328                                break;
1329                        case 11: /* ANSI X3.64-1979 (SCO-ish?)
1330                                  * Select first alternate font, lets
1331                                  * chars < 32 be displayed as ROM chars.
1332                                  */
1333                                vc->vc_translate = set_translate(IBMPC_MAP, vc);
1334                                vc->vc_disp_ctrl = 1;
1335                                vc->vc_toggle_meta = 0;
1336                                break;
1337                        case 12: /* ANSI X3.64-1979 (SCO-ish?)
1338                                  * Select second alternate font, toggle
1339                                  * high bit before displaying as ROM char.
1340                                  */
1341                                vc->vc_translate = set_translate(IBMPC_MAP, vc);
1342                                vc->vc_disp_ctrl = 1;
1343                                vc->vc_toggle_meta = 1;
1344                                break;
1345                        case 21:
1346                        case 22:
1347                                vc->vc_intensity = 1;
1348                                break;
1349                        case 23:
1350                                vc->vc_italic = 0;
1351                                break;
1352                        case 24:
1353                                vc->vc_underline = 0;
1354                                break;
1355                        case 25:
1356                                vc->vc_blink = 0;
1357                                break;
1358                        case 27:
1359                                vc->vc_reverse = 0;
1360                                break;
1361                        case 38: /* ITU T.416
1362                                  * Higher colour modes.
1363                                  * They break the usual properties of SGR codes
1364                                  * and thus need to be detected and ignored by
1365                                  * hand.  Strictly speaking, that standard also
1366                                  * wants : rather than ; as separators, contrary
1367                                  * to ECMA-48, but no one produces such codes
1368                                  * and almost no one accepts them.
1369                                  */
1370                                i++;
1371                                if (i > vc->vc_npar)
1372                                        break;
1373                                if (vc->vc_par[i] == 5 &&  /* 256 colours */
1374                                    i < vc->vc_npar) {     /* ubiquitous */
1375                                        i++;
1376                                        rgb_foreground(vc,
1377                                                rgb_from_256(vc->vc_par[i]));
1378                                } else if (vc->vc_par[i] == 2 &&  /* 24 bit */
1379                                           i <= vc->vc_npar + 3) {/* extremely rare */
1380                                        struct rgb c = {
1381                                                .r = vc->vc_par[i + 1],
1382                                                .g = vc->vc_par[i + 2],
1383                                                .b = vc->vc_par[i + 3],
1384                                        };
1385                                        rgb_foreground(vc, c);
1386                                        i += 3;
1387                                }
1388                                /* Subcommands 3 (CMY) and 4 (CMYK) are so insane
1389                                 * there's no point in supporting them.
1390                                 */
1391                                break;
1392                        case 48:
1393                                i++;
1394                                if (i > vc->vc_npar)
1395                                        break;
1396                                if (vc->vc_par[i] == 5 &&  /* 256 colours */
1397                                    i < vc->vc_npar) {
1398                                        i++;
1399                                        rgb_background(vc,
1400                                                rgb_from_256(vc->vc_par[i]));
1401                                } else if (vc->vc_par[i] == 2 && /* 24 bit */
1402                                           i <= vc->vc_npar + 3) {
1403                                        struct rgb c = {
1404                                                .r = vc->vc_par[i + 1],
1405                                                .g = vc->vc_par[i + 2],
1406                                                .b = vc->vc_par[i + 3],
1407                                        };
1408                                        rgb_background(vc, c);
1409                                        i += 3;
1410                                }
1411                                break;
1412                        case 39:
1413                                vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1414                                break;
1415                        case 49:
1416                                vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1417                                break;
1418                        default:
1419                                if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1420                                        vc->vc_color = color_table[vc->vc_par[i] - 30]
1421                                                | (vc->vc_color & 0xf0);
1422                                else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1423                                        vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1424                                                | (vc->vc_color & 0x0f);
1425                                break;
1426                }
1427        update_attr(vc);
1428}
1429
1430static void respond_string(const char *p, struct tty_port *port)
1431{
1432        while (*p) {
1433                tty_insert_flip_char(port, *p, 0);
1434                p++;
1435        }
1436        tty_schedule_flip(port);
1437}
1438
1439static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1440{
1441        char buf[40];
1442
1443        sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1444        respond_string(buf, tty->port);
1445}
1446
1447static inline void status_report(struct tty_struct *tty)
1448{
1449        respond_string("\033[0n", tty->port);   /* Terminal ok */
1450}
1451
1452static inline void respond_ID(struct tty_struct *tty)
1453{
1454        respond_string(VT102ID, tty->port);
1455}
1456
1457void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1458{
1459        char buf[8];
1460
1461        sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1462                (char)('!' + mry));
1463        respond_string(buf, tty->port);
1464}
1465
1466/* invoked via ioctl(TIOCLINUX) and through set_selection */
1467int mouse_reporting(void)
1468{
1469        return vc_cons[fg_console].d->vc_report_mouse;
1470}
1471
1472/* console_lock is held */
1473static void set_mode(struct vc_data *vc, int on_off)
1474{
1475        int i;
1476
1477        for (i = 0; i <= vc->vc_npar; i++)
1478                if (vc->vc_ques) {
1479                        switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1480                        case 1:                 /* Cursor keys send ^[Ox/^[[x */
1481                                if (on_off)
1482                                        set_kbd(vc, decckm);
1483                                else
1484                                        clr_kbd(vc, decckm);
1485                                break;
1486                        case 3: /* 80/132 mode switch unimplemented */
1487                                vc->vc_deccolm = on_off;
1488#if 0
1489                                vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1490                                /* this alone does not suffice; some user mode
1491                                   utility has to change the hardware regs */
1492#endif
1493                                break;
1494                        case 5:                 /* Inverted screen on/off */
1495                                if (vc->vc_decscnm != on_off) {
1496                                        vc->vc_decscnm = on_off;
1497                                        invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1498                                        update_attr(vc);
1499                                }
1500                                break;
1501                        case 6:                 /* Origin relative/absolute */
1502                                vc->vc_decom = on_off;
1503                                gotoxay(vc, 0, 0);
1504                                break;
1505                        case 7:                 /* Autowrap on/off */
1506                                vc->vc_decawm = on_off;
1507                                break;
1508                        case 8:                 /* Autorepeat on/off */
1509                                if (on_off)
1510                                        set_kbd(vc, decarm);
1511                                else
1512                                        clr_kbd(vc, decarm);
1513                                break;
1514                        case 9:
1515                                vc->vc_report_mouse = on_off ? 1 : 0;
1516                                break;
1517                        case 25:                /* Cursor on/off */
1518                                vc->vc_deccm = on_off;
1519                                break;
1520                        case 1000:
1521                                vc->vc_report_mouse = on_off ? 2 : 0;
1522                                break;
1523                        }
1524                } else {
1525                        switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1526                        case 3:                 /* Monitor (display ctrls) */
1527                                vc->vc_disp_ctrl = on_off;
1528                                break;
1529                        case 4:                 /* Insert Mode on/off */
1530                                vc->vc_decim = on_off;
1531                                break;
1532                        case 20:                /* Lf, Enter == CrLf/Lf */
1533                                if (on_off)
1534                                        set_kbd(vc, lnm);
1535                                else
1536                                        clr_kbd(vc, lnm);
1537                                break;
1538                        }
1539                }
1540}
1541
1542/* console_lock is held */
1543static void setterm_command(struct vc_data *vc)
1544{
1545        switch(vc->vc_par[0]) {
1546                case 1: /* set color for underline mode */
1547                        if (vc->vc_can_do_color &&
1548                                        vc->vc_par[1] < 16) {
1549                                vc->vc_ulcolor = color_table[vc->vc_par[1]];
1550                                if (vc->vc_underline)
1551                                        update_attr(vc);
1552                        }
1553                        break;
1554                case 2: /* set color for half intensity mode */
1555                        if (vc->vc_can_do_color &&
1556                                        vc->vc_par[1] < 16) {
1557                                vc->vc_halfcolor = color_table[vc->vc_par[1]];
1558                                if (vc->vc_intensity == 0)
1559                                        update_attr(vc);
1560                        }
1561                        break;
1562                case 8: /* store colors as defaults */
1563                        vc->vc_def_color = vc->vc_attr;
1564                        if (vc->vc_hi_font_mask == 0x100)
1565                                vc->vc_def_color >>= 1;
1566                        default_attr(vc);
1567                        update_attr(vc);
1568                        break;
1569                case 9: /* set blanking interval */
1570                        blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1571                        poke_blanked_console();
1572                        break;
1573                case 10: /* set bell frequency in Hz */
1574                        if (vc->vc_npar >= 1)
1575                                vc->vc_bell_pitch = vc->vc_par[1];
1576                        else
1577                                vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1578                        break;
1579                case 11: /* set bell duration in msec */
1580                        if (vc->vc_npar >= 1)
1581                                vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1582                                        msecs_to_jiffies(vc->vc_par[1]) : 0;
1583                        else
1584                                vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1585                        break;
1586                case 12: /* bring specified console to the front */
1587                        if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1588                                set_console(vc->vc_par[1] - 1);
1589                        break;
1590                case 13: /* unblank the screen */
1591                        poke_blanked_console();
1592                        break;
1593                case 14: /* set vesa powerdown interval */
1594                        vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1595                        break;
1596                case 15: /* activate the previous console */
1597                        set_console(last_console);
1598                        break;
1599                case 16: /* set cursor blink duration in msec */
1600                        if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1601                                        vc->vc_par[1] <= USHRT_MAX)
1602                                vc->vc_cur_blink_ms = vc->vc_par[1];
1603                        else
1604                                vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1605                        break;
1606        }
1607}
1608
1609/* console_lock is held */
1610static void csi_at(struct vc_data *vc, unsigned int nr)
1611{
1612        if (nr > vc->vc_cols - vc->vc_x)
1613                nr = vc->vc_cols - vc->vc_x;
1614        else if (!nr)
1615                nr = 1;
1616        insert_char(vc, nr);
1617}
1618
1619/* console_lock is held */
1620static void csi_L(struct vc_data *vc, unsigned int nr)
1621{
1622        if (nr > vc->vc_rows - vc->vc_y)
1623                nr = vc->vc_rows - vc->vc_y;
1624        else if (!nr)
1625                nr = 1;
1626        scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1627        vc->vc_need_wrap = 0;
1628}
1629
1630/* console_lock is held */
1631static void csi_P(struct vc_data *vc, unsigned int nr)
1632{
1633        if (nr > vc->vc_cols - vc->vc_x)
1634                nr = vc->vc_cols - vc->vc_x;
1635        else if (!nr)
1636                nr = 1;
1637        delete_char(vc, nr);
1638}
1639
1640/* console_lock is held */
1641static void csi_M(struct vc_data *vc, unsigned int nr)
1642{
1643        if (nr > vc->vc_rows - vc->vc_y)
1644                nr = vc->vc_rows - vc->vc_y;
1645        else if (!nr)
1646                nr=1;
1647        scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1648        vc->vc_need_wrap = 0;
1649}
1650
1651/* console_lock is held (except via vc_init->reset_terminal */
1652static void save_cur(struct vc_data *vc)
1653{
1654        vc->vc_saved_x          = vc->vc_x;
1655        vc->vc_saved_y          = vc->vc_y;
1656        vc->vc_s_intensity      = vc->vc_intensity;
1657        vc->vc_s_italic         = vc->vc_italic;
1658        vc->vc_s_underline      = vc->vc_underline;
1659        vc->vc_s_blink          = vc->vc_blink;
1660        vc->vc_s_reverse        = vc->vc_reverse;
1661        vc->vc_s_charset        = vc->vc_charset;
1662        vc->vc_s_color          = vc->vc_color;
1663        vc->vc_saved_G0         = vc->vc_G0_charset;
1664        vc->vc_saved_G1         = vc->vc_G1_charset;
1665}
1666
1667/* console_lock is held */
1668static void restore_cur(struct vc_data *vc)
1669{
1670        gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1671        vc->vc_intensity        = vc->vc_s_intensity;
1672        vc->vc_italic           = vc->vc_s_italic;
1673        vc->vc_underline        = vc->vc_s_underline;
1674        vc->vc_blink            = vc->vc_s_blink;
1675        vc->vc_reverse          = vc->vc_s_reverse;
1676        vc->vc_charset          = vc->vc_s_charset;
1677        vc->vc_color            = vc->vc_s_color;
1678        vc->vc_G0_charset       = vc->vc_saved_G0;
1679        vc->vc_G1_charset       = vc->vc_saved_G1;
1680        vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1681        update_attr(vc);
1682        vc->vc_need_wrap = 0;
1683}
1684
1685enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1686        EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1687        ESpalette, ESosc };
1688
1689/* console_lock is held (except via vc_init()) */
1690static void reset_terminal(struct vc_data *vc, int do_clear)
1691{
1692        vc->vc_top              = 0;
1693        vc->vc_bottom           = vc->vc_rows;
1694        vc->vc_state            = ESnormal;
1695        vc->vc_ques             = 0;
1696        vc->vc_translate        = set_translate(LAT1_MAP, vc);
1697        vc->vc_G0_charset       = LAT1_MAP;
1698        vc->vc_G1_charset       = GRAF_MAP;
1699        vc->vc_charset          = 0;
1700        vc->vc_need_wrap        = 0;
1701        vc->vc_report_mouse     = 0;
1702        vc->vc_utf              = default_utf8;
1703        vc->vc_utf_count        = 0;
1704
1705        vc->vc_disp_ctrl        = 0;
1706        vc->vc_toggle_meta      = 0;
1707
1708        vc->vc_decscnm          = 0;
1709        vc->vc_decom            = 0;
1710        vc->vc_decawm           = 1;
1711        vc->vc_deccm            = global_cursor_default;
1712        vc->vc_decim            = 0;
1713
1714        vt_reset_keyboard(vc->vc_num);
1715
1716        vc->vc_cursor_type = cur_default;
1717        vc->vc_complement_mask = vc->vc_s_complement_mask;
1718
1719        default_attr(vc);
1720        update_attr(vc);
1721
1722        vc->vc_tab_stop[0]      = 0x01010100;
1723        vc->vc_tab_stop[1]      =
1724        vc->vc_tab_stop[2]      =
1725        vc->vc_tab_stop[3]      =
1726        vc->vc_tab_stop[4]      =
1727        vc->vc_tab_stop[5]      =
1728        vc->vc_tab_stop[6]      =
1729        vc->vc_tab_stop[7]      = 0x01010101;
1730
1731        vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1732        vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1733        vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1734
1735        gotoxy(vc, 0, 0);
1736        save_cur(vc);
1737        if (do_clear)
1738            csi_J(vc, 2);
1739}
1740
1741/* console_lock is held */
1742static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1743{
1744        /*
1745         *  Control characters can be used in the _middle_
1746         *  of an escape sequence.
1747         */
1748        if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1749                return;
1750        switch (c) {
1751        case 0:
1752                return;
1753        case 7:
1754                if (vc->vc_state == ESosc)
1755                        vc->vc_state = ESnormal;
1756                else if (vc->vc_bell_duration)
1757                        kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1758                return;
1759        case 8:
1760                bs(vc);
1761                return;
1762        case 9:
1763                vc->vc_pos -= (vc->vc_x << 1);
1764                while (vc->vc_x < vc->vc_cols - 1) {
1765                        vc->vc_x++;
1766                        if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1767                                break;
1768                }
1769                vc->vc_pos += (vc->vc_x << 1);
1770                notify_write(vc, '\t');
1771                return;
1772        case 10: case 11: case 12:
1773                lf(vc);
1774                if (!is_kbd(vc, lnm))
1775                        return;
1776        case 13:
1777                cr(vc);
1778                return;
1779        case 14:
1780                vc->vc_charset = 1;
1781                vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1782                vc->vc_disp_ctrl = 1;
1783                return;
1784        case 15:
1785                vc->vc_charset = 0;
1786                vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1787                vc->vc_disp_ctrl = 0;
1788                return;
1789        case 24: case 26:
1790                vc->vc_state = ESnormal;
1791                return;
1792        case 27:
1793                vc->vc_state = ESesc;
1794                return;
1795        case 127:
1796                del(vc);
1797                return;
1798        case 128+27:
1799                vc->vc_state = ESsquare;
1800                return;
1801        }
1802        switch(vc->vc_state) {
1803        case ESesc:
1804                vc->vc_state = ESnormal;
1805                switch (c) {
1806                case '[':
1807                        vc->vc_state = ESsquare;
1808                        return;
1809                case ']':
1810                        vc->vc_state = ESnonstd;
1811                        return;
1812                case '%':
1813                        vc->vc_state = ESpercent;
1814                        return;
1815                case 'E':
1816                        cr(vc);
1817                        lf(vc);
1818                        return;
1819                case 'M':
1820                        ri(vc);
1821                        return;
1822                case 'D':
1823                        lf(vc);
1824                        return;
1825                case 'H':
1826                        vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1827                        return;
1828                case 'Z':
1829                        respond_ID(tty);
1830                        return;
1831                case '7':
1832                        save_cur(vc);
1833                        return;
1834                case '8':
1835                        restore_cur(vc);
1836                        return;
1837                case '(':
1838                        vc->vc_state = ESsetG0;
1839                        return;
1840                case ')':
1841                        vc->vc_state = ESsetG1;
1842                        return;
1843                case '#':
1844                        vc->vc_state = EShash;
1845                        return;
1846                case 'c':
1847                        reset_terminal(vc, 1);
1848                        return;
1849                case '>':  /* Numeric keypad */
1850                        clr_kbd(vc, kbdapplic);
1851                        return;
1852                case '=':  /* Appl. keypad */
1853                        set_kbd(vc, kbdapplic);
1854                        return;
1855                }
1856                return;
1857        case ESnonstd:
1858                if (c=='P') {   /* palette escape sequence */
1859                        for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1860                                vc->vc_par[vc->vc_npar] = 0;
1861                        vc->vc_npar = 0;
1862                        vc->vc_state = ESpalette;
1863                        return;
1864                } else if (c=='R') {   /* reset palette */
1865                        reset_palette(vc);
1866                        vc->vc_state = ESnormal;
1867                } else if (c>='0' && c<='9')
1868                        vc->vc_state = ESosc;
1869                else
1870                        vc->vc_state = ESnormal;
1871                return;
1872        case ESpalette:
1873                if (isxdigit(c)) {
1874                        vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1875                        if (vc->vc_npar == 7) {
1876                                int i = vc->vc_par[0] * 3, j = 1;
1877                                vc->vc_palette[i] = 16 * vc->vc_par[j++];
1878                                vc->vc_palette[i++] += vc->vc_par[j++];
1879                                vc->vc_palette[i] = 16 * vc->vc_par[j++];
1880                                vc->vc_palette[i++] += vc->vc_par[j++];
1881                                vc->vc_palette[i] = 16 * vc->vc_par[j++];
1882                                vc->vc_palette[i] += vc->vc_par[j];
1883                                set_palette(vc);
1884                                vc->vc_state = ESnormal;
1885                        }
1886                } else
1887                        vc->vc_state = ESnormal;
1888                return;
1889        case ESsquare:
1890                for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1891                        vc->vc_par[vc->vc_npar] = 0;
1892                vc->vc_npar = 0;
1893                vc->vc_state = ESgetpars;
1894                if (c == '[') { /* Function key */
1895                        vc->vc_state=ESfunckey;
1896                        return;
1897                }
1898                vc->vc_ques = (c == '?');
1899                if (vc->vc_ques)
1900                        return;
1901        case ESgetpars:
1902                if (c == ';' && vc->vc_npar < NPAR - 1) {
1903                        vc->vc_npar++;
1904                        return;
1905                } else if (c>='0' && c<='9') {
1906                        vc->vc_par[vc->vc_npar] *= 10;
1907                        vc->vc_par[vc->vc_npar] += c - '0';
1908                        return;
1909                }
1910                vc->vc_state = ESnormal;
1911                switch(c) {
1912                case 'h':
1913                        set_mode(vc, 1);
1914                        return;
1915                case 'l':
1916                        set_mode(vc, 0);
1917                        return;
1918                case 'c':
1919                        if (vc->vc_ques) {
1920                                if (vc->vc_par[0])
1921                                        vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1922                                else
1923                                        vc->vc_cursor_type = cur_default;
1924                                return;
1925                        }
1926                        break;
1927                case 'm':
1928                        if (vc->vc_ques) {
1929                                clear_selection();
1930                                if (vc->vc_par[0])
1931                                        vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1932                                else
1933                                        vc->vc_complement_mask = vc->vc_s_complement_mask;
1934                                return;
1935                        }
1936                        break;
1937                case 'n':
1938                        if (!vc->vc_ques) {
1939                                if (vc->vc_par[0] == 5)
1940                                        status_report(tty);
1941                                else if (vc->vc_par[0] == 6)
1942                                        cursor_report(vc, tty);
1943                        }
1944                        return;
1945                }
1946                if (vc->vc_ques) {
1947                        vc->vc_ques = 0;
1948                        return;
1949                }
1950                switch(c) {
1951                case 'G': case '`':
1952                        if (vc->vc_par[0])
1953                                vc->vc_par[0]--;
1954                        gotoxy(vc, vc->vc_par[0], vc->vc_y);
1955                        return;
1956                case 'A':
1957                        if (!vc->vc_par[0])
1958                                vc->vc_par[0]++;
1959                        gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1960                        return;
1961                case 'B': case 'e':
1962                        if (!vc->vc_par[0])
1963                                vc->vc_par[0]++;
1964                        gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1965                        return;
1966                case 'C': case 'a':
1967                        if (!vc->vc_par[0])
1968                                vc->vc_par[0]++;
1969                        gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1970                        return;
1971                case 'D':
1972                        if (!vc->vc_par[0])
1973                                vc->vc_par[0]++;
1974                        gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1975                        return;
1976                case 'E':
1977                        if (!vc->vc_par[0])
1978                                vc->vc_par[0]++;
1979                        gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1980                        return;
1981                case 'F':
1982                        if (!vc->vc_par[0])
1983                                vc->vc_par[0]++;
1984                        gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1985                        return;
1986                case 'd':
1987                        if (vc->vc_par[0])
1988                                vc->vc_par[0]--;
1989                        gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1990                        return;
1991                case 'H': case 'f':
1992                        if (vc->vc_par[0])
1993                                vc->vc_par[0]--;
1994                        if (vc->vc_par[1])
1995                                vc->vc_par[1]--;
1996                        gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1997                        return;
1998                case 'J':
1999                        csi_J(vc, vc->vc_par[0]);
2000                        return;
2001                case 'K':
2002                        csi_K(vc, vc->vc_par[0]);
2003                        return;
2004                case 'L':
2005                        csi_L(vc, vc->vc_par[0]);
2006                        return;
2007                case 'M':
2008                        csi_M(vc, vc->vc_par[0]);
2009                        return;
2010                case 'P':
2011                        csi_P(vc, vc->vc_par[0]);
2012                        return;
2013                case 'c':
2014                        if (!vc->vc_par[0])
2015                                respond_ID(tty);
2016                        return;
2017                case 'g':
2018                        if (!vc->vc_par[0])
2019                                vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
2020                        else if (vc->vc_par[0] == 3) {
2021                                vc->vc_tab_stop[0] =
2022                                        vc->vc_tab_stop[1] =
2023                                        vc->vc_tab_stop[2] =
2024                                        vc->vc_tab_stop[3] =
2025                                        vc->vc_tab_stop[4] =
2026                                        vc->vc_tab_stop[5] =
2027                                        vc->vc_tab_stop[6] =
2028                                        vc->vc_tab_stop[7] = 0;
2029                        }
2030                        return;
2031                case 'm':
2032                        csi_m(vc);
2033                        return;
2034                case 'q': /* DECLL - but only 3 leds */
2035                        /* map 0,1,2,3 to 0,1,2,4 */
2036                        if (vc->vc_par[0] < 4)
2037                                vt_set_led_state(vc->vc_num,
2038                                            (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2039                        return;
2040                case 'r':
2041                        if (!vc->vc_par[0])
2042                                vc->vc_par[0]++;
2043                        if (!vc->vc_par[1])
2044                                vc->vc_par[1] = vc->vc_rows;
2045                        /* Minimum allowed region is 2 lines */
2046                        if (vc->vc_par[0] < vc->vc_par[1] &&
2047                            vc->vc_par[1] <= vc->vc_rows) {
2048                                vc->vc_top = vc->vc_par[0] - 1;
2049                                vc->vc_bottom = vc->vc_par[1];
2050                                gotoxay(vc, 0, 0);
2051                        }
2052                        return;
2053                case 's':
2054                        save_cur(vc);
2055                        return;
2056                case 'u':
2057                        restore_cur(vc);
2058                        return;
2059                case 'X':
2060                        csi_X(vc, vc->vc_par[0]);
2061                        return;
2062                case '@':
2063                        csi_at(vc, vc->vc_par[0]);
2064                        return;
2065                case ']': /* setterm functions */
2066                        setterm_command(vc);
2067                        return;
2068                }
2069                return;
2070        case ESpercent:
2071                vc->vc_state = ESnormal;
2072                switch (c) {
2073                case '@':  /* defined in ISO 2022 */
2074                        vc->vc_utf = 0;
2075                        return;
2076                case 'G':  /* prelim official escape code */
2077                case '8':  /* retained for compatibility */
2078                        vc->vc_utf = 1;
2079                        return;
2080                }
2081                return;
2082        case ESfunckey:
2083                vc->vc_state = ESnormal;
2084                return;
2085        case EShash:
2086                vc->vc_state = ESnormal;
2087                if (c == '8') {
2088                        /* DEC screen alignment test. kludge :-) */
2089                        vc->vc_video_erase_char =
2090                                (vc->vc_video_erase_char & 0xff00) | 'E';
2091                        csi_J(vc, 2);
2092                        vc->vc_video_erase_char =
2093                                (vc->vc_video_erase_char & 0xff00) | ' ';
2094                        do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2095                }
2096                return;
2097        case ESsetG0:
2098                if (c == '0')
2099                        vc->vc_G0_charset = GRAF_MAP;
2100                else if (c == 'B')
2101                        vc->vc_G0_charset = LAT1_MAP;
2102                else if (c == 'U')
2103                        vc->vc_G0_charset = IBMPC_MAP;
2104                else if (c == 'K')
2105                        vc->vc_G0_charset = USER_MAP;
2106                if (vc->vc_charset == 0)
2107                        vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2108                vc->vc_state = ESnormal;
2109                return;
2110        case ESsetG1:
2111                if (c == '0')
2112                        vc->vc_G1_charset = GRAF_MAP;
2113                else if (c == 'B')
2114                        vc->vc_G1_charset = LAT1_MAP;
2115                else if (c == 'U')
2116                        vc->vc_G1_charset = IBMPC_MAP;
2117                else if (c == 'K')
2118                        vc->vc_G1_charset = USER_MAP;
2119                if (vc->vc_charset == 1)
2120                        vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2121                vc->vc_state = ESnormal;
2122                return;
2123        case ESosc:
2124                return;
2125        default:
2126                vc->vc_state = ESnormal;
2127        }
2128}
2129
2130/* is_double_width() is based on the wcwidth() implementation by
2131 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2132 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2133 */
2134struct interval {
2135        uint32_t first;
2136        uint32_t last;
2137};
2138
2139static int bisearch(uint32_t ucs, const struct interval *table, int max)
2140{
2141        int min = 0;
2142        int mid;
2143
2144        if (ucs < table[0].first || ucs > table[max].last)
2145                return 0;
2146        while (max >= min) {
2147                mid = (min + max) / 2;
2148                if (ucs > table[mid].last)
2149                        min = mid + 1;
2150                else if (ucs < table[mid].first)
2151                        max = mid - 1;
2152                else
2153                        return 1;
2154        }
2155        return 0;
2156}
2157
2158static int is_double_width(uint32_t ucs)
2159{
2160        static const struct interval double_width[] = {
2161                { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2162                { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2163                { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2164                { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2165        };
2166        return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2167}
2168
2169/* acquires console_lock */
2170static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2171{
2172#ifdef VT_BUF_VRAM_ONLY
2173#define FLUSH do { } while(0);
2174#else
2175#define FLUSH if (draw_x >= 0) { \
2176        vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2177        draw_x = -1; \
2178        }
2179#endif
2180
2181        int c, tc, ok, n = 0, draw_x = -1;
2182        unsigned int currcons;
2183        unsigned long draw_from = 0, draw_to = 0;
2184        struct vc_data *vc;
2185        unsigned char vc_attr;
2186        struct vt_notifier_param param;
2187        uint8_t rescan;
2188        uint8_t inverse;
2189        uint8_t width;
2190        u16 himask, charmask;
2191
2192        if (in_interrupt())
2193                return count;
2194
2195        might_sleep();
2196
2197        console_lock();
2198        vc = tty->driver_data;
2199        if (vc == NULL) {
2200                printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2201                console_unlock();
2202                return 0;
2203        }
2204
2205        currcons = vc->vc_num;
2206        if (!vc_cons_allocated(currcons)) {
2207                /* could this happen? */
2208                pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2209                console_unlock();
2210                return 0;
2211        }
2212
2213        himask = vc->vc_hi_font_mask;
2214        charmask = himask ? 0x1ff : 0xff;
2215
2216        /* undraw cursor first */
2217        if (IS_FG(vc))
2218                hide_cursor(vc);
2219
2220        param.vc = vc;
2221
2222        while (!tty->stopped && count) {
2223                int orig = *buf;
2224                c = orig;
2225                buf++;
2226                n++;
2227                count--;
2228                rescan = 0;
2229                inverse = 0;
2230                width = 1;
2231
2232                /* Do no translation at all in control states */
2233                if (vc->vc_state != ESnormal) {
2234                        tc = c;
2235                } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2236                    /* Combine UTF-8 into Unicode in vc_utf_char.
2237                     * vc_utf_count is the number of continuation bytes still
2238                     * expected to arrive.
2239                     * vc_npar is the number of continuation bytes arrived so
2240                     * far
2241                     */
2242rescan_last_byte:
2243                    if ((c & 0xc0) == 0x80) {
2244                        /* Continuation byte received */
2245                        static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2246                        if (vc->vc_utf_count) {
2247                            vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2248                            vc->vc_npar++;
2249                            if (--vc->vc_utf_count) {
2250                                /* Still need some bytes */
2251                                continue;
2252                            }
2253                            /* Got a whole character */
2254                            c = vc->vc_utf_char;
2255                            /* Reject overlong sequences */
2256                            if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2257                                        c > utf8_length_changes[vc->vc_npar])
2258                                c = 0xfffd;
2259                        } else {
2260                            /* Unexpected continuation byte */
2261                            vc->vc_utf_count = 0;
2262                            c = 0xfffd;
2263                        }
2264                    } else {
2265                        /* Single ASCII byte or first byte of a sequence received */
2266                        if (vc->vc_utf_count) {
2267                            /* Continuation byte expected */
2268                            rescan = 1;
2269                            vc->vc_utf_count = 0;
2270                            c = 0xfffd;
2271                        } else if (c > 0x7f) {
2272                            /* First byte of a multibyte sequence received */
2273                            vc->vc_npar = 0;
2274                            if ((c & 0xe0) == 0xc0) {
2275                                vc->vc_utf_count = 1;
2276                                vc->vc_utf_char = (c & 0x1f);
2277                            } else if ((c & 0xf0) == 0xe0) {
2278                                vc->vc_utf_count = 2;
2279                                vc->vc_utf_char = (c & 0x0f);
2280                            } else if ((c & 0xf8) == 0xf0) {
2281                                vc->vc_utf_count = 3;
2282                                vc->vc_utf_char = (c & 0x07);
2283                            } else if ((c & 0xfc) == 0xf8) {
2284                                vc->vc_utf_count = 4;
2285                                vc->vc_utf_char = (c & 0x03);
2286                            } else if ((c & 0xfe) == 0xfc) {
2287                                vc->vc_utf_count = 5;
2288                                vc->vc_utf_char = (c & 0x01);
2289                            } else {
2290                                /* 254 and 255 are invalid */
2291                                c = 0xfffd;
2292                            }
2293                            if (vc->vc_utf_count) {
2294                                /* Still need some bytes */
2295                                continue;
2296                            }
2297                        }
2298                        /* Nothing to do if an ASCII byte was received */
2299                    }
2300                    /* End of UTF-8 decoding. */
2301                    /* c is the received character, or U+FFFD for invalid sequences. */
2302                    /* Replace invalid Unicode code points with U+FFFD too */
2303                    if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2304                        c = 0xfffd;
2305                    tc = c;
2306                } else {        /* no utf or alternate charset mode */
2307                    tc = vc_translate(vc, c);
2308                }
2309
2310                param.c = tc;
2311                if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2312                                        &param) == NOTIFY_STOP)
2313                        continue;
2314
2315                /* If the original code was a control character we
2316                 * only allow a glyph to be displayed if the code is
2317                 * not normally used (such as for cursor movement) or
2318                 * if the disp_ctrl mode has been explicitly enabled.
2319                 * Certain characters (as given by the CTRL_ALWAYS
2320                 * bitmap) are always displayed as control characters,
2321                 * as the console would be pretty useless without
2322                 * them; to display an arbitrary font position use the
2323                 * direct-to-font zone in UTF-8 mode.
2324                 */
2325                ok = tc && (c >= 32 ||
2326                            !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2327                                  vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2328                        && (c != 127 || vc->vc_disp_ctrl)
2329                        && (c != 128+27);
2330
2331                if (vc->vc_state == ESnormal && ok) {
2332                        if (vc->vc_utf && !vc->vc_disp_ctrl) {
2333                                if (is_double_width(c))
2334                                        width = 2;
2335                        }
2336                        /* Now try to find out how to display it */
2337                        tc = conv_uni_to_pc(vc, tc);
2338                        if (tc & ~charmask) {
2339                                if (tc == -1 || tc == -2) {
2340                                    continue; /* nothing to display */
2341                                }
2342                                /* Glyph not found */
2343                                if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2344                                    /* In legacy mode use the glyph we get by a 1:1 mapping.
2345                                       This would make absolutely no sense with Unicode in mind,
2346                                       but do this for ASCII characters since a font may lack
2347                                       Unicode mapping info and we don't want to end up with
2348                                       having question marks only. */
2349                                    tc = c;
2350                                } else {
2351                                    /* Display U+FFFD. If it's not found, display an inverse question mark. */
2352                                    tc = conv_uni_to_pc(vc, 0xfffd);
2353                                    if (tc < 0) {
2354                                        inverse = 1;
2355                                        tc = conv_uni_to_pc(vc, '?');
2356                                        if (tc < 0) tc = '?';
2357                                    }
2358                                }
2359                        }
2360
2361                        if (!inverse) {
2362                                vc_attr = vc->vc_attr;
2363                        } else {
2364                                /* invert vc_attr */
2365                                if (!vc->vc_can_do_color) {
2366                                        vc_attr = (vc->vc_attr) ^ 0x08;
2367                                } else if (vc->vc_hi_font_mask == 0x100) {
2368                                        vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2369                                } else {
2370                                        vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2371                                }
2372                                FLUSH
2373                        }
2374
2375                        while (1) {
2376                                if (vc->vc_need_wrap || vc->vc_decim)
2377                                        FLUSH
2378                                if (vc->vc_need_wrap) {
2379                                        cr(vc);
2380                                        lf(vc);
2381                                }
2382                                if (vc->vc_decim)
2383                                        insert_char(vc, 1);
2384                                scr_writew(himask ?
2385                                             ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2386                                             (vc_attr << 8) + tc,
2387                                           (u16 *) vc->vc_pos);
2388                                if (DO_UPDATE(vc) && draw_x < 0) {
2389                                        draw_x = vc->vc_x;
2390                                        draw_from = vc->vc_pos;
2391                                }
2392                                if (vc->vc_x == vc->vc_cols - 1) {
2393                                        vc->vc_need_wrap = vc->vc_decawm;
2394                                        draw_to = vc->vc_pos + 2;
2395                                } else {
2396                                        vc->vc_x++;
2397                                        draw_to = (vc->vc_pos += 2);
2398                                }
2399
2400                                if (!--width) break;
2401
2402                                tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2403                                if (tc < 0) tc = ' ';
2404                        }
2405                        notify_write(vc, c);
2406
2407                        if (inverse) {
2408                                FLUSH
2409                        }
2410
2411                        if (rescan) {
2412                                rescan = 0;
2413                                inverse = 0;
2414                                width = 1;
2415                                c = orig;
2416                                goto rescan_last_byte;
2417                        }
2418                        continue;
2419                }
2420                FLUSH
2421                do_con_trol(tty, vc, orig);
2422        }
2423        FLUSH
2424        console_conditional_schedule();
2425        console_unlock();
2426        notify_update(vc);
2427        return n;
2428#undef FLUSH
2429}
2430
2431/*
2432 * This is the console switching callback.
2433 *
2434 * Doing console switching in a process context allows
2435 * us to do the switches asynchronously (needed when we want
2436 * to switch due to a keyboard interrupt).  Synchronization
2437 * with other console code and prevention of re-entrancy is
2438 * ensured with console_lock.
2439 */
2440static void console_callback(struct work_struct *ignored)
2441{
2442        console_lock();
2443
2444        if (want_console >= 0) {
2445                if (want_console != fg_console &&
2446                    vc_cons_allocated(want_console)) {
2447                        hide_cursor(vc_cons[fg_console].d);
2448                        change_console(vc_cons[want_console].d);
2449                        /* we only changed when the console had already
2450                           been allocated - a new console is not created
2451                           in an interrupt routine */
2452                }
2453                want_console = -1;
2454        }
2455        if (do_poke_blanked_console) { /* do not unblank for a LED change */
2456                do_poke_blanked_console = 0;
2457                poke_blanked_console();
2458        }
2459        if (scrollback_delta) {
2460                struct vc_data *vc = vc_cons[fg_console].d;
2461                clear_selection();
2462                if (vc->vc_mode == KD_TEXT)
2463                        vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2464                scrollback_delta = 0;
2465        }
2466        if (blank_timer_expired) {
2467                do_blank_screen(0);
2468                blank_timer_expired = 0;
2469        }
2470        notify_update(vc_cons[fg_console].d);
2471
2472        console_unlock();
2473}
2474
2475int set_console(int nr)
2476{
2477        struct vc_data *vc = vc_cons[fg_console].d;
2478
2479        if (!vc_cons_allocated(nr) || vt_dont_switch ||
2480                (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2481
2482                /*
2483                 * Console switch will fail in console_callback() or
2484                 * change_console() so there is no point scheduling
2485                 * the callback
2486                 *
2487                 * Existing set_console() users don't check the return
2488                 * value so this shouldn't break anything
2489                 */
2490                return -EINVAL;
2491        }
2492
2493        want_console = nr;
2494        schedule_console_callback();
2495
2496        return 0;
2497}
2498
2499struct tty_driver *console_driver;
2500
2501#ifdef CONFIG_VT_CONSOLE
2502
2503/**
2504 * vt_kmsg_redirect() - Sets/gets the kernel message console
2505 * @new:        The new virtual terminal number or -1 if the console should stay
2506 *              unchanged
2507 *
2508 * By default, the kernel messages are always printed on the current virtual
2509 * console. However, the user may modify that default with the
2510 * TIOCL_SETKMSGREDIRECT ioctl call.
2511 *
2512 * This function sets the kernel message console to be @new. It returns the old
2513 * virtual console number. The virtual terminal number 0 (both as parameter and
2514 * return value) means no redirection (i.e. always printed on the currently
2515 * active console).
2516 *
2517 * The parameter -1 means that only the current console is returned, but the
2518 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2519 * case to make the code more understandable.
2520 *
2521 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2522 * the parameter and always returns 0.
2523 */
2524int vt_kmsg_redirect(int new)
2525{
2526        static int kmsg_con;
2527
2528        if (new != -1)
2529                return xchg(&kmsg_con, new);
2530        else
2531                return kmsg_con;
2532}
2533
2534/*
2535 *      Console on virtual terminal
2536 *
2537 * The console must be locked when we get here.
2538 */
2539
2540static void vt_console_print(struct console *co, const char *b, unsigned count)
2541{
2542        struct vc_data *vc = vc_cons[fg_console].d;
2543        unsigned char c;
2544        static DEFINE_SPINLOCK(printing_lock);
2545        const ushort *start;
2546        ushort cnt = 0;
2547        ushort myx;
2548        int kmsg_console;
2549
2550        /* console busy or not yet initialized */
2551        if (!printable)
2552                return;
2553        if (!spin_trylock(&printing_lock))
2554                return;
2555
2556        kmsg_console = vt_get_kmsg_redirect();
2557        if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2558                vc = vc_cons[kmsg_console - 1].d;
2559
2560        /* read `x' only after setting currcons properly (otherwise
2561           the `x' macro will read the x of the foreground console). */
2562        myx = vc->vc_x;
2563
2564        if (!vc_cons_allocated(fg_console)) {
2565                /* impossible */
2566                /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2567                goto quit;
2568        }
2569
2570        if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2571                goto quit;
2572
2573        /* undraw cursor first */
2574        if (IS_FG(vc))
2575                hide_cursor(vc);
2576
2577        start = (ushort *)vc->vc_pos;
2578
2579        /* Contrived structure to try to emulate original need_wrap behaviour
2580         * Problems caused when we have need_wrap set on '\n' character */
2581        while (count--) {
2582                c = *b++;
2583                if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2584                        if (cnt > 0) {
2585                                if (CON_IS_VISIBLE(vc))
2586                                        vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2587                                vc->vc_x += cnt;
2588                                if (vc->vc_need_wrap)
2589                                        vc->vc_x--;
2590                                cnt = 0;
2591                        }
2592                        if (c == 8) {           /* backspace */
2593                                bs(vc);
2594                                start = (ushort *)vc->vc_pos;
2595                                myx = vc->vc_x;
2596                                continue;
2597                        }
2598                        if (c != 13)
2599                                lf(vc);
2600                        cr(vc);
2601                        start = (ushort *)vc->vc_pos;
2602                        myx = vc->vc_x;
2603                        if (c == 10 || c == 13)
2604                                continue;
2605                }
2606                scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2607                notify_write(vc, c);
2608                cnt++;
2609                if (myx == vc->vc_cols - 1) {
2610                        vc->vc_need_wrap = 1;
2611                        continue;
2612                }
2613                vc->vc_pos += 2;
2614                myx++;
2615        }
2616        if (cnt > 0) {
2617                if (CON_IS_VISIBLE(vc))
2618                        vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2619                vc->vc_x += cnt;
2620                if (vc->vc_x == vc->vc_cols) {
2621                        vc->vc_x--;
2622                        vc->vc_need_wrap = 1;
2623                }
2624        }
2625        set_cursor(vc);
2626        notify_update(vc);
2627
2628quit:
2629        spin_unlock(&printing_lock);
2630}
2631
2632static struct tty_driver *vt_console_device(struct console *c, int *index)
2633{
2634        *index = c->index ? c->index-1 : fg_console;
2635        return console_driver;
2636}
2637
2638static struct console vt_console_driver = {
2639        .name           = "tty",
2640        .write          = vt_console_print,
2641        .device         = vt_console_device,
2642        .unblank        = unblank_screen,
2643        .flags          = CON_PRINTBUFFER,
2644        .index          = -1,
2645};
2646#endif
2647
2648/*
2649 *      Handling of Linux-specific VC ioctls
2650 */
2651
2652/*
2653 * Generally a bit racy with respect to console_lock();.
2654 *
2655 * There are some functions which don't need it.
2656 *
2657 * There are some functions which can sleep for arbitrary periods
2658 * (paste_selection) but we don't need the lock there anyway.
2659 *
2660 * set_selection has locking, and definitely needs it
2661 */
2662
2663int tioclinux(struct tty_struct *tty, unsigned long arg)
2664{
2665        char type, data;
2666        char __user *p = (char __user *)arg;
2667        int lines;
2668        int ret;
2669
2670        if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2671                return -EPERM;
2672        if (get_user(type, p))
2673                return -EFAULT;
2674        ret = 0;
2675
2676        switch (type)
2677        {
2678                case TIOCL_SETSEL:
2679                        console_lock();
2680                        ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2681                        console_unlock();
2682                        break;
2683                case TIOCL_PASTESEL:
2684                        ret = paste_selection(tty);
2685                        break;
2686                case TIOCL_UNBLANKSCREEN:
2687                        console_lock();
2688                        unblank_screen();
2689                        console_unlock();
2690                        break;
2691                case TIOCL_SELLOADLUT:
2692                        console_lock();
2693                        ret = sel_loadlut(p);
2694                        console_unlock();
2695                        break;
2696                case TIOCL_GETSHIFTSTATE:
2697
2698        /*
2699         * Make it possible to react to Shift+Mousebutton.
2700         * Note that 'shift_state' is an undocumented
2701         * kernel-internal variable; programs not closely
2702         * related to the kernel should not use this.
2703         */
2704                        data = vt_get_shift_state();
2705                        ret = __put_user(data, p);
2706                        break;
2707                case TIOCL_GETMOUSEREPORTING:
2708                        console_lock(); /* May be overkill */
2709                        data = mouse_reporting();
2710                        console_unlock();
2711                        ret = __put_user(data, p);
2712                        break;
2713                case TIOCL_SETVESABLANK:
2714                        console_lock();
2715                        ret = set_vesa_blanking(p);
2716                        console_unlock();
2717                        break;
2718                case TIOCL_GETKMSGREDIRECT:
2719                        data = vt_get_kmsg_redirect();
2720                        ret = __put_user(data, p);
2721                        break;
2722                case TIOCL_SETKMSGREDIRECT:
2723                        if (!capable(CAP_SYS_ADMIN)) {
2724                                ret = -EPERM;
2725                        } else {
2726                                if (get_user(data, p+1))
2727                                        ret = -EFAULT;
2728                                else
2729                                        vt_kmsg_redirect(data);
2730                        }
2731                        break;
2732                case TIOCL_GETFGCONSOLE:
2733                        /* No locking needed as this is a transiently
2734                           correct return anyway if the caller hasn't
2735                           disabled switching */
2736                        ret = fg_console;
2737                        break;
2738                case TIOCL_SCROLLCONSOLE:
2739                        if (get_user(lines, (s32 __user *)(p+4))) {
2740                                ret = -EFAULT;
2741                        } else {
2742                                /* Need the console lock here. Note that lots
2743                                   of other calls need fixing before the lock
2744                                   is actually useful ! */
2745                                console_lock();
2746                                scrollfront(vc_cons[fg_console].d, lines);
2747                                console_unlock();
2748                                ret = 0;
2749                        }
2750                        break;
2751                case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2752                        console_lock();
2753                        ignore_poke = 1;
2754                        do_blank_screen(0);
2755                        console_unlock();
2756                        break;
2757                case TIOCL_BLANKEDSCREEN:
2758                        ret = console_blanked;
2759                        break;
2760                default:
2761                        ret = -EINVAL;
2762                        break;
2763        }
2764        return ret;
2765}
2766
2767/*
2768 * /dev/ttyN handling
2769 */
2770
2771static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2772{
2773        int     retval;
2774
2775        retval = do_con_write(tty, buf, count);
2776        con_flush_chars(tty);
2777
2778        return retval;
2779}
2780
2781static int con_put_char(struct tty_struct *tty, unsigned char ch)
2782{
2783        if (in_interrupt())
2784                return 0;       /* n_r3964 calls put_char() from interrupt context */
2785        return do_con_write(tty, &ch, 1);
2786}
2787
2788static int con_write_room(struct tty_struct *tty)
2789{
2790        if (tty->stopped)
2791                return 0;
2792        return 32768;           /* No limit, really; we're not buffering */
2793}
2794
2795static int con_chars_in_buffer(struct tty_struct *tty)
2796{
2797        return 0;               /* we're not buffering */
2798}
2799
2800/*
2801 * con_throttle and con_unthrottle are only used for
2802 * paste_selection(), which has to stuff in a large number of
2803 * characters...
2804 */
2805static void con_throttle(struct tty_struct *tty)
2806{
2807}
2808
2809static void con_unthrottle(struct tty_struct *tty)
2810{
2811        struct vc_data *vc = tty->driver_data;
2812
2813        wake_up_interruptible(&vc->paste_wait);
2814}
2815
2816/*
2817 * Turn the Scroll-Lock LED on when the tty is stopped
2818 */
2819static void con_stop(struct tty_struct *tty)
2820{
2821        int console_num;
2822        if (!tty)
2823                return;
2824        console_num = tty->index;
2825        if (!vc_cons_allocated(console_num))
2826                return;
2827        vt_kbd_con_stop(console_num);
2828}
2829
2830/*
2831 * Turn the Scroll-Lock LED off when the console is started
2832 */
2833static void con_start(struct tty_struct *tty)
2834{
2835        int console_num;
2836        if (!tty)
2837                return;
2838        console_num = tty->index;
2839        if (!vc_cons_allocated(console_num))
2840                return;
2841        vt_kbd_con_start(console_num);
2842}
2843
2844static void con_flush_chars(struct tty_struct *tty)
2845{
2846        struct vc_data *vc;
2847
2848        if (in_interrupt())     /* from flush_to_ldisc */
2849                return;
2850
2851        /* if we race with con_close(), vt may be null */
2852        console_lock();
2853        vc = tty->driver_data;
2854        if (vc)
2855                set_cursor(vc);
2856        console_unlock();
2857}
2858
2859/*
2860 * Allocate the console screen memory.
2861 */
2862static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2863{
2864        unsigned int currcons = tty->index;
2865        struct vc_data *vc;
2866        int ret;
2867
2868        console_lock();
2869        ret = vc_allocate(currcons);
2870        if (ret)
2871                goto unlock;
2872
2873        vc = vc_cons[currcons].d;
2874
2875        /* Still being freed */
2876        if (vc->port.tty) {
2877                ret = -ERESTARTSYS;
2878                goto unlock;
2879        }
2880
2881        ret = tty_port_install(&vc->port, driver, tty);
2882        if (ret)
2883                goto unlock;
2884
2885        tty->driver_data = vc;
2886        vc->port.tty = tty;
2887
2888        if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2889                tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2890                tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2891        }
2892        if (vc->vc_utf)
2893                tty->termios.c_iflag |= IUTF8;
2894        else
2895                tty->termios.c_iflag &= ~IUTF8;
2896unlock:
2897        console_unlock();
2898        return ret;
2899}
2900
2901static int con_open(struct tty_struct *tty, struct file *filp)
2902{
2903        /* everything done in install */
2904        return 0;
2905}
2906
2907
2908static void con_close(struct tty_struct *tty, struct file *filp)
2909{
2910        /* Nothing to do - we defer to shutdown */
2911}
2912
2913static void con_shutdown(struct tty_struct *tty)
2914{
2915        struct vc_data *vc = tty->driver_data;
2916        BUG_ON(vc == NULL);
2917        console_lock();
2918        vc->port.tty = NULL;
2919        console_unlock();
2920}
2921
2922static int default_color           = 7; /* white */
2923static int default_italic_color    = 2; // green (ASCII)
2924static int default_underline_color = 3; // cyan (ASCII)
2925module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2926module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2927module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2928
2929static void vc_init(struct vc_data *vc, unsigned int rows,
2930                    unsigned int cols, int do_clear)
2931{
2932        int j, k ;
2933
2934        vc->vc_cols = cols;
2935        vc->vc_rows = rows;
2936        vc->vc_size_row = cols << 1;
2937        vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2938
2939        set_origin(vc);
2940        vc->vc_pos = vc->vc_origin;
2941        reset_vc(vc);
2942        for (j=k=0; j<16; j++) {
2943                vc->vc_palette[k++] = default_red[j] ;
2944                vc->vc_palette[k++] = default_grn[j] ;
2945                vc->vc_palette[k++] = default_blu[j] ;
2946        }
2947        vc->vc_def_color       = default_color;
2948        vc->vc_ulcolor         = default_underline_color;
2949        vc->vc_itcolor         = default_italic_color;
2950        vc->vc_halfcolor       = 0x08;   /* grey */
2951        init_waitqueue_head(&vc->paste_wait);
2952        reset_terminal(vc, do_clear);
2953}
2954
2955/*
2956 * This routine initializes console interrupts, and does nothing
2957 * else. If you want the screen to clear, call tty_write with
2958 * the appropriate escape-sequence.
2959 */
2960
2961static int __init con_init(void)
2962{
2963        const char *display_desc = NULL;
2964        struct vc_data *vc;
2965        unsigned int currcons = 0, i;
2966
2967        console_lock();
2968
2969        if (conswitchp)
2970                display_desc = conswitchp->con_startup();
2971        if (!display_desc) {
2972                fg_console = 0;
2973                console_unlock();
2974                return 0;
2975        }
2976
2977        for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2978                struct con_driver *con_driver = &registered_con_driver[i];
2979
2980                if (con_driver->con == NULL) {
2981                        con_driver->con = conswitchp;
2982                        con_driver->desc = display_desc;
2983                        con_driver->flag = CON_DRIVER_FLAG_INIT;
2984                        con_driver->first = 0;
2985                        con_driver->last = MAX_NR_CONSOLES - 1;
2986                        break;
2987                }
2988        }
2989
2990        for (i = 0; i < MAX_NR_CONSOLES; i++)
2991                con_driver_map[i] = conswitchp;
2992
2993        if (blankinterval) {
2994                blank_state = blank_normal_wait;
2995                mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2996        }
2997
2998        for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2999                vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3000                INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3001                tty_port_init(&vc->port);
3002                visual_init(vc, currcons, 1);
3003                vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3004                vc_init(vc, vc->vc_rows, vc->vc_cols,
3005                        currcons || !vc->vc_sw->con_save_screen);
3006        }
3007        currcons = fg_console = 0;
3008        master_display_fg = vc = vc_cons[currcons].d;
3009        set_origin(vc);
3010        save_screen(vc);
3011        gotoxy(vc, vc->vc_x, vc->vc_y);
3012        csi_J(vc, 0);
3013        update_screen(vc);
3014        pr_info("Console: %s %s %dx%d\n",
3015                vc->vc_can_do_color ? "colour" : "mono",
3016                display_desc, vc->vc_cols, vc->vc_rows);
3017        printable = 1;
3018
3019        console_unlock();
3020
3021#ifdef CONFIG_VT_CONSOLE
3022        register_console(&vt_console_driver);
3023#endif
3024        return 0;
3025}
3026console_initcall(con_init);
3027
3028static const struct tty_operations con_ops = {
3029        .install = con_install,
3030        .open = con_open,
3031        .close = con_close,
3032        .write = con_write,
3033        .write_room = con_write_room,
3034        .put_char = con_put_char,
3035        .flush_chars = con_flush_chars,
3036        .chars_in_buffer = con_chars_in_buffer,
3037        .ioctl = vt_ioctl,
3038#ifdef CONFIG_COMPAT
3039        .compat_ioctl = vt_compat_ioctl,
3040#endif
3041        .stop = con_stop,
3042        .start = con_start,
3043        .throttle = con_throttle,
3044        .unthrottle = con_unthrottle,
3045        .resize = vt_resize,
3046        .shutdown = con_shutdown
3047};
3048
3049static struct cdev vc0_cdev;
3050
3051static ssize_t show_tty_active(struct device *dev,
3052                                struct device_attribute *attr, char *buf)
3053{
3054        return sprintf(buf, "tty%d\n", fg_console + 1);
3055}
3056static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3057
3058static struct attribute *vt_dev_attrs[] = {
3059        &dev_attr_active.attr,
3060        NULL
3061};
3062
3063ATTRIBUTE_GROUPS(vt_dev);
3064
3065int __init vty_init(const struct file_operations *console_fops)
3066{
3067        cdev_init(&vc0_cdev, console_fops);
3068        if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3069            register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3070                panic("Couldn't register /dev/tty0 driver\n");
3071        tty0dev = device_create_with_groups(tty_class, NULL,
3072                                            MKDEV(TTY_MAJOR, 0), NULL,
3073                                            vt_dev_groups, "tty0");
3074        if (IS_ERR(tty0dev))
3075                tty0dev = NULL;
3076
3077        vcs_init();
3078
3079        console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3080        if (!console_driver)
3081                panic("Couldn't allocate console driver\n");
3082
3083        console_driver->name = "tty";
3084        console_driver->name_base = 1;
3085        console_driver->major = TTY_MAJOR;
3086        console_driver->minor_start = 1;
3087        console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3088        console_driver->init_termios = tty_std_termios;
3089        if (default_utf8)
3090                console_driver->init_termios.c_iflag |= IUTF8;
3091        console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3092        tty_set_operations(console_driver, &con_ops);
3093        if (tty_register_driver(console_driver))
3094                panic("Couldn't register console driver\n");
3095        kbd_init();
3096        console_map_init();
3097#ifdef CONFIG_MDA_CONSOLE
3098        mda_console_init();
3099#endif
3100        return 0;
3101}
3102
3103#ifndef VT_SINGLE_DRIVER
3104
3105static struct class *vtconsole_class;
3106
3107static int do_bind_con_driver(const struct consw *csw, int first, int last,
3108                           int deflt)
3109{
3110        struct module *owner = csw->owner;
3111        const char *desc = NULL;
3112        struct con_driver *con_driver;
3113        int i, j = -1, k = -1, retval = -ENODEV;
3114
3115        if (!try_module_get(owner))
3116                return -ENODEV;
3117
3118        WARN_CONSOLE_UNLOCKED();
3119
3120        /* check if driver is registered */
3121        for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3122                con_driver = &registered_con_driver[i];
3123
3124                if (con_driver->con == csw) {
3125                        desc = con_driver->desc;
3126                        retval = 0;
3127                        break;
3128                }
3129        }
3130
3131        if (retval)
3132                goto err;
3133
3134        if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3135                csw->con_startup();
3136                con_driver->flag |= CON_DRIVER_FLAG_INIT;
3137        }
3138
3139        if (deflt) {
3140                if (conswitchp)
3141                        module_put(conswitchp->owner);
3142
3143                __module_get(owner);
3144                conswitchp = csw;
3145        }
3146
3147        first = max(first, con_driver->first);
3148        last = min(last, con_driver->last);
3149
3150        for (i = first; i <= last; i++) {
3151                int old_was_color;
3152                struct vc_data *vc = vc_cons[i].d;
3153
3154                if (con_driver_map[i])
3155                        module_put(con_driver_map[i]->owner);
3156                __module_get(owner);
3157                con_driver_map[i] = csw;
3158
3159                if (!vc || !vc->vc_sw)
3160                        continue;
3161
3162                j = i;
3163
3164                if (CON_IS_VISIBLE(vc)) {
3165                        k = i;
3166                        save_screen(vc);
3167                }
3168
3169                old_was_color = vc->vc_can_do_color;
3170                vc->vc_sw->con_deinit(vc);
3171                vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3172                visual_init(vc, i, 0);
3173                set_origin(vc);
3174                update_attr(vc);
3175
3176                /* If the console changed between mono <-> color, then
3177                 * the attributes in the screenbuf will be wrong.  The
3178                 * following resets all attributes to something sane.
3179                 */
3180                if (old_was_color != vc->vc_can_do_color)
3181                        clear_buffer_attributes(vc);
3182        }
3183
3184        pr_info("Console: switching ");
3185        if (!deflt)
3186                printk("consoles %d-%d ", first+1, last+1);
3187        if (j >= 0) {
3188                struct vc_data *vc = vc_cons[j].d;
3189
3190                printk("to %s %s %dx%d\n",
3191                       vc->vc_can_do_color ? "colour" : "mono",
3192                       desc, vc->vc_cols, vc->vc_rows);
3193
3194                if (k >= 0) {
3195                        vc = vc_cons[k].d;
3196                        update_screen(vc);
3197                }
3198        } else
3199                printk("to %s\n", desc);
3200
3201        retval = 0;
3202err:
3203        module_put(owner);
3204        return retval;
3205};
3206
3207
3208#ifdef CONFIG_VT_HW_CONSOLE_BINDING
3209/* unlocked version of unbind_con_driver() */
3210int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3211{
3212        struct module *owner = csw->owner;
3213        const struct consw *defcsw = NULL;
3214        struct con_driver *con_driver = NULL, *con_back = NULL;
3215        int i, retval = -ENODEV;
3216
3217        if (!try_module_get(owner))
3218                return -ENODEV;
3219
3220        WARN_CONSOLE_UNLOCKED();
3221
3222        /* check if driver is registered and if it is unbindable */
3223        for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3224                con_driver = &registered_con_driver[i];
3225
3226                if (con_driver->con == csw &&
3227                    con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3228                        retval = 0;
3229                        break;
3230                }
3231        }
3232
3233        if (retval)
3234                goto err;
3235
3236        retval = -ENODEV;
3237
3238        /* check if backup driver exists */
3239        for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3240                con_back = &registered_con_driver[i];
3241
3242                if (con_back->con && con_back->con != csw) {
3243                        defcsw = con_back->con;
3244                        retval = 0;
3245                        break;
3246                }
3247        }
3248
3249        if (retval)
3250                goto err;
3251
3252        if (!con_is_bound(csw))
3253                goto err;
3254
3255        first = max(first, con_driver->first);
3256        last = min(last, con_driver->last);
3257
3258        for (i = first; i <= last; i++) {
3259                if (con_driver_map[i] == csw) {
3260                        module_put(csw->owner);
3261                        con_driver_map[i] = NULL;
3262                }
3263        }
3264
3265        if (!con_is_bound(defcsw)) {
3266                const struct consw *defconsw = conswitchp;
3267
3268                defcsw->con_startup();
3269                con_back->flag |= CON_DRIVER_FLAG_INIT;
3270                /*
3271                 * vgacon may change the default driver to point
3272                 * to dummycon, we restore it here...
3273                 */
3274                conswitchp = defconsw;
3275        }
3276
3277        if (!con_is_bound(csw))
3278                con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3279
3280        /* ignore return value, binding should not fail */
3281        do_bind_con_driver(defcsw, first, last, deflt);
3282err:
3283        module_put(owner);
3284        return retval;
3285
3286}
3287EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3288
3289static int vt_bind(struct con_driver *con)
3290{
3291        const struct consw *defcsw = NULL, *csw = NULL;
3292        int i, more = 1, first = -1, last = -1, deflt = 0;
3293
3294        if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3295                goto err;
3296
3297        csw = con->con;
3298
3299        for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3300                struct con_driver *con = &registered_con_driver[i];
3301
3302                if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3303                        defcsw = con->con;
3304                        break;
3305                }
3306        }
3307
3308        if (!defcsw)
3309                goto err;
3310
3311        while (more) {
3312                more = 0;
3313
3314                for (i = con->first; i <= con->last; i++) {
3315                        if (con_driver_map[i] == defcsw) {
3316                                if (first == -1)
3317                                        first = i;
3318                                last = i;
3319                                more = 1;
3320                        } else if (first != -1)
3321                                break;
3322                }
3323
3324                if (first == 0 && last == MAX_NR_CONSOLES -1)
3325                        deflt = 1;
3326
3327                if (first != -1)
3328                        do_bind_con_driver(csw, first, last, deflt);
3329
3330                first = -1;
3331                last = -1;
3332                deflt = 0;
3333        }
3334
3335err:
3336        return 0;
3337}
3338
3339static int vt_unbind(struct con_driver *con)
3340{
3341        const struct consw *csw = NULL;
3342        int i, more = 1, first = -1, last = -1, deflt = 0;
3343        int ret;
3344
3345        if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3346                goto err;
3347
3348        csw = con->con;
3349
3350        while (more) {
3351                more = 0;
3352
3353                for (i = con->first; i <= con->last; i++) {
3354                        if (con_driver_map[i] == csw) {
3355                                if (first == -1)
3356                                        first = i;
3357                                last = i;
3358                                more = 1;
3359                        } else if (first != -1)
3360                                break;
3361                }
3362
3363                if (first == 0 && last == MAX_NR_CONSOLES -1)
3364                        deflt = 1;
3365
3366                if (first != -1) {
3367                        ret = do_unbind_con_driver(csw, first, last, deflt);
3368                        if (ret != 0)
3369                                return ret;
3370                }
3371
3372                first = -1;
3373                last = -1;
3374                deflt = 0;
3375        }
3376
3377err:
3378        return 0;
3379}
3380#else
3381static inline int vt_bind(struct con_driver *con)
3382{
3383        return 0;
3384}
3385static inline int vt_unbind(struct con_driver *con)
3386{
3387        return 0;
3388}
3389#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3390
3391static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3392                          const char *buf, size_t count)
3393{
3394        struct con_driver *con = dev_get_drvdata(dev);
3395        int bind = simple_strtoul(buf, NULL, 0);
3396
3397        console_lock();
3398
3399        if (bind)
3400                vt_bind(con);
3401        else
3402                vt_unbind(con);
3403
3404        console_unlock();
3405
3406        return count;
3407}
3408
3409static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3410                         char *buf)
3411{
3412        struct con_driver *con = dev_get_drvdata(dev);
3413        int bind = con_is_bound(con->con);
3414
3415        return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3416}
3417
3418static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3419                         char *buf)
3420{
3421        struct con_driver *con = dev_get_drvdata(dev);
3422
3423        return snprintf(buf, PAGE_SIZE, "%s %s\n",
3424                        (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3425                         con->desc);
3426
3427}
3428
3429static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3430static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3431
3432static struct attribute *con_dev_attrs[] = {
3433        &dev_attr_bind.attr,
3434        &dev_attr_name.attr,
3435        NULL
3436};
3437
3438ATTRIBUTE_GROUPS(con_dev);
3439
3440static int vtconsole_init_device(struct con_driver *con)
3441{
3442        con->flag |= CON_DRIVER_FLAG_ATTR;
3443        return 0;
3444}
3445
3446static void vtconsole_deinit_device(struct con_driver *con)
3447{
3448        con->flag &= ~CON_DRIVER_FLAG_ATTR;
3449}
3450
3451/**
3452 * con_is_bound - checks if driver is bound to the console
3453 * @csw: console driver
3454 *
3455 * RETURNS: zero if unbound, nonzero if bound
3456 *
3457 * Drivers can call this and if zero, they should release
3458 * all resources allocated on con_startup()
3459 */
3460int con_is_bound(const struct consw *csw)
3461{
3462        int i, bound = 0;
3463
3464        for (i = 0; i < MAX_NR_CONSOLES; i++) {
3465                if (con_driver_map[i] == csw) {
3466                        bound = 1;
3467                        break;
3468                }
3469        }
3470
3471        return bound;
3472}
3473EXPORT_SYMBOL(con_is_bound);
3474
3475/**
3476 * con_debug_enter - prepare the console for the kernel debugger
3477 * @sw: console driver
3478 *
3479 * Called when the console is taken over by the kernel debugger, this
3480 * function needs to save the current console state, then put the console
3481 * into a state suitable for the kernel debugger.
3482 *
3483 * RETURNS:
3484 * Zero on success, nonzero if a failure occurred when trying to prepare
3485 * the console for the debugger.
3486 */
3487int con_debug_enter(struct vc_data *vc)
3488{
3489        int ret = 0;
3490
3491        saved_fg_console = fg_console;
3492        saved_last_console = last_console;
3493        saved_want_console = want_console;
3494        saved_vc_mode = vc->vc_mode;
3495        saved_console_blanked = console_blanked;
3496        vc->vc_mode = KD_TEXT;
3497        console_blanked = 0;
3498        if (vc->vc_sw->con_debug_enter)
3499                ret = vc->vc_sw->con_debug_enter(vc);
3500#ifdef CONFIG_KGDB_KDB
3501        /* Set the initial LINES variable if it is not already set */
3502        if (vc->vc_rows < 999) {
3503                int linecount;
3504                char lns[4];
3505                const char *setargs[3] = {
3506                        "set",
3507                        "LINES",
3508                        lns,
3509                };
3510                if (kdbgetintenv(setargs[0], &linecount)) {
3511                        snprintf(lns, 4, "%i", vc->vc_rows);
3512                        kdb_set(2, setargs);
3513                }
3514        }
3515        if (vc->vc_cols < 999) {
3516                int colcount;
3517                char cols[4];
3518                const char *setargs[3] = {
3519                        "set",
3520                        "COLUMNS",
3521                        cols,
3522                };
3523                if (kdbgetintenv(setargs[0], &colcount)) {
3524                        snprintf(cols, 4, "%i", vc->vc_cols);
3525                        kdb_set(2, setargs);
3526                }
3527        }
3528#endif /* CONFIG_KGDB_KDB */
3529        return ret;
3530}
3531EXPORT_SYMBOL_GPL(con_debug_enter);
3532
3533/**
3534 * con_debug_leave - restore console state
3535 * @sw: console driver
3536 *
3537 * Restore the console state to what it was before the kernel debugger
3538 * was invoked.
3539 *
3540 * RETURNS:
3541 * Zero on success, nonzero if a failure occurred when trying to restore
3542 * the console.
3543 */
3544int con_debug_leave(void)
3545{
3546        struct vc_data *vc;
3547        int ret = 0;
3548
3549        fg_console = saved_fg_console;
3550        last_console = saved_last_console;
3551        want_console = saved_want_console;
3552        console_blanked = saved_console_blanked;
3553        vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3554
3555        vc = vc_cons[fg_console].d;
3556        if (vc->vc_sw->con_debug_leave)
3557                ret = vc->vc_sw->con_debug_leave(vc);
3558        return ret;
3559}
3560EXPORT_SYMBOL_GPL(con_debug_leave);
3561
3562static int do_register_con_driver(const struct consw *csw, int first, int last)
3563{
3564        struct module *owner = csw->owner;
3565        struct con_driver *con_driver;
3566        const char *desc;
3567        int i, retval = 0;
3568
3569        WARN_CONSOLE_UNLOCKED();
3570
3571        if (!try_module_get(owner))
3572                return -ENODEV;
3573
3574        for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3575                con_driver = &registered_con_driver[i];
3576
3577                /* already registered */
3578                if (con_driver->con == csw)
3579                        retval = -EBUSY;
3580        }
3581
3582        if (retval)
3583                goto err;
3584
3585        desc = csw->con_startup();
3586
3587        if (!desc)
3588                goto err;
3589
3590        retval = -EINVAL;
3591
3592        for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3593                con_driver = &registered_con_driver[i];
3594
3595                if (con_driver->con == NULL &&
3596                    !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
3597                        con_driver->con = csw;
3598                        con_driver->desc = desc;
3599                        con_driver->node = i;
3600                        con_driver->flag = CON_DRIVER_FLAG_MODULE |
3601                                           CON_DRIVER_FLAG_INIT;
3602                        con_driver->first = first;
3603                        con_driver->last = last;
3604                        retval = 0;
3605                        break;
3606                }
3607        }
3608
3609        if (retval)
3610                goto err;
3611
3612        con_driver->dev =
3613                device_create_with_groups(vtconsole_class, NULL,
3614                                          MKDEV(0, con_driver->node),
3615                                          con_driver, con_dev_groups,
3616                                          "vtcon%i", con_driver->node);
3617        if (IS_ERR(con_driver->dev)) {
3618                printk(KERN_WARNING "Unable to create device for %s; "
3619                       "errno = %ld\n", con_driver->desc,
3620                       PTR_ERR(con_driver->dev));
3621                con_driver->dev = NULL;
3622        } else {
3623                vtconsole_init_device(con_driver);
3624        }
3625
3626err:
3627        module_put(owner);
3628        return retval;
3629}
3630
3631
3632/**
3633 * do_unregister_con_driver - unregister console driver from console layer
3634 * @csw: console driver
3635 *
3636 * DESCRIPTION: All drivers that registers to the console layer must
3637 * call this function upon exit, or if the console driver is in a state
3638 * where it won't be able to handle console services, such as the
3639 * framebuffer console without loaded framebuffer drivers.
3640 *
3641 * The driver must unbind first prior to unregistration.
3642 */
3643int do_unregister_con_driver(const struct consw *csw)
3644{
3645        int i;
3646
3647        /* cannot unregister a bound driver */
3648        if (con_is_bound(csw))
3649                return -EBUSY;
3650
3651        if (csw == conswitchp)
3652                return -EINVAL;
3653
3654        for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3655                struct con_driver *con_driver = &registered_con_driver[i];
3656
3657                if (con_driver->con == csw) {
3658                        /*
3659                         * Defer the removal of the sysfs entries since that
3660                         * will acquire the kernfs s_active lock and we can't
3661                         * acquire this lock while holding the console lock:
3662                         * the unbind sysfs entry imposes already the opposite
3663                         * order. Reset con already here to prevent any later
3664                         * lookup to succeed and mark this slot as zombie, so
3665                         * it won't get reused until we complete the removal
3666                         * in the deferred work.
3667                         */
3668                        con_driver->con = NULL;
3669                        con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
3670                        schedule_work(&con_driver_unregister_work);
3671
3672                        return 0;
3673                }
3674        }
3675
3676        return -ENODEV;
3677}
3678EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3679
3680static void con_driver_unregister_callback(struct work_struct *ignored)
3681{
3682        int i;
3683
3684        console_lock();
3685
3686        for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3687                struct con_driver *con_driver = &registered_con_driver[i];
3688
3689                if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
3690                        continue;
3691
3692                console_unlock();
3693
3694                vtconsole_deinit_device(con_driver);
3695                device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
3696
3697                console_lock();
3698
3699                if (WARN_ON_ONCE(con_driver->con))
3700                        con_driver->con = NULL;
3701                con_driver->desc = NULL;
3702                con_driver->dev = NULL;
3703                con_driver->node = 0;
3704                WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
3705                con_driver->flag = 0;
3706                con_driver->first = 0;
3707                con_driver->last = 0;
3708        }
3709
3710        console_unlock();
3711}
3712
3713/*
3714 *      If we support more console drivers, this function is used
3715 *      when a driver wants to take over some existing consoles
3716 *      and become default driver for newly opened ones.
3717 *
3718 *      do_take_over_console is basically a register followed by unbind
3719 */
3720int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3721{
3722        int err;
3723
3724        err = do_register_con_driver(csw, first, last);
3725        /*
3726         * If we get an busy error we still want to bind the console driver
3727         * and return success, as we may have unbound the console driver
3728         * but not unregistered it.
3729         */
3730        if (err == -EBUSY)
3731                err = 0;
3732        if (!err)
3733                do_bind_con_driver(csw, first, last, deflt);
3734
3735        return err;
3736}
3737EXPORT_SYMBOL_GPL(do_take_over_console);
3738
3739
3740/*
3741 * give_up_console is a wrapper to unregister_con_driver. It will only
3742 * work if driver is fully unbound.
3743 */
3744void give_up_console(const struct consw *csw)
3745{
3746        console_lock();
3747        do_unregister_con_driver(csw);
3748        console_unlock();
3749}
3750
3751static int __init vtconsole_class_init(void)
3752{
3753        int i;
3754
3755        vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3756        if (IS_ERR(vtconsole_class)) {
3757                printk(KERN_WARNING "Unable to create vt console class; "
3758                       "errno = %ld\n", PTR_ERR(vtconsole_class));
3759                vtconsole_class = NULL;
3760        }
3761
3762        /* Add system drivers to sysfs */
3763        for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3764                struct con_driver *con = &registered_con_driver[i];
3765
3766                if (con->con && !con->dev) {
3767                        con->dev =
3768                                device_create_with_groups(vtconsole_class, NULL,
3769                                                          MKDEV(0, con->node),
3770                                                          con, con_dev_groups,
3771                                                          "vtcon%i", con->node);
3772
3773                        if (IS_ERR(con->dev)) {
3774                                printk(KERN_WARNING "Unable to create "
3775                                       "device for %s; errno = %ld\n",
3776                                       con->desc, PTR_ERR(con->dev));
3777                                con->dev = NULL;
3778                        } else {
3779                                vtconsole_init_device(con);
3780                        }
3781                }
3782        }
3783
3784        return 0;
3785}
3786postcore_initcall(vtconsole_class_init);
3787
3788#endif
3789
3790/*
3791 *      Screen blanking
3792 */
3793
3794static int set_vesa_blanking(char __user *p)
3795{
3796        unsigned int mode;
3797
3798        if (get_user(mode, p + 1))
3799                return -EFAULT;
3800
3801        vesa_blank_mode = (mode < 4) ? mode : 0;
3802        return 0;
3803}
3804
3805void do_blank_screen(int entering_gfx)
3806{
3807        struct vc_data *vc = vc_cons[fg_console].d;
3808        int i;
3809
3810        WARN_CONSOLE_UNLOCKED();
3811
3812        if (console_blanked) {
3813                if (blank_state == blank_vesa_wait) {
3814                        blank_state = blank_off;
3815                        vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3816                }
3817                return;
3818        }
3819
3820        /* entering graphics mode? */
3821        if (entering_gfx) {
3822                hide_cursor(vc);
3823                save_screen(vc);
3824                vc->vc_sw->con_blank(vc, -1, 1);
3825                console_blanked = fg_console + 1;
3826                blank_state = blank_off;
3827                set_origin(vc);
3828                return;
3829        }
3830
3831        if (blank_state != blank_normal_wait)
3832                return;
3833        blank_state = blank_off;
3834
3835        /* don't blank graphics */
3836        if (vc->vc_mode != KD_TEXT) {
3837                console_blanked = fg_console + 1;
3838                return;
3839        }
3840
3841        hide_cursor(vc);
3842        del_timer_sync(&console_timer);
3843        blank_timer_expired = 0;
3844
3845        save_screen(vc);
3846        /* In case we need to reset origin, blanking hook returns 1 */
3847        i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3848        console_blanked = fg_console + 1;
3849        if (i)
3850                set_origin(vc);
3851
3852        if (console_blank_hook && console_blank_hook(1))
3853                return;
3854
3855        if (vesa_off_interval && vesa_blank_mode) {
3856                blank_state = blank_vesa_wait;
3857                mod_timer(&console_timer, jiffies + vesa_off_interval);
3858        }
3859        vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3860}
3861EXPORT_SYMBOL(do_blank_screen);
3862
3863/*
3864 * Called by timer as well as from vt_console_driver
3865 */
3866void do_unblank_screen(int leaving_gfx)
3867{
3868        struct vc_data *vc;
3869
3870        /* This should now always be called from a "sane" (read: can schedule)
3871         * context for the sake of the low level drivers, except in the special
3872         * case of oops_in_progress
3873         */
3874        if (!oops_in_progress)
3875                might_sleep();
3876
3877        WARN_CONSOLE_UNLOCKED();
3878
3879        ignore_poke = 0;
3880        if (!console_blanked)
3881                return;
3882        if (!vc_cons_allocated(fg_console)) {
3883                /* impossible */
3884                pr_warn("unblank_screen: tty %d not allocated ??\n",
3885                        fg_console + 1);
3886                return;
3887        }
3888        vc = vc_cons[fg_console].d;
3889        /* Try to unblank in oops case too */
3890        if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3891                return; /* but leave console_blanked != 0 */
3892
3893        if (blankinterval) {
3894                mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3895                blank_state = blank_normal_wait;
3896        }
3897
3898        console_blanked = 0;
3899        if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3900                /* Low-level driver cannot restore -> do it ourselves */
3901                update_screen(vc);
3902        if (console_blank_hook)
3903                console_blank_hook(0);
3904        set_palette(vc);
3905        set_cursor(vc);
3906        vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3907}
3908EXPORT_SYMBOL(do_unblank_screen);
3909
3910/*
3911 * This is called by the outside world to cause a forced unblank, mostly for
3912 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3913 * call it with 1 as an argument and so force a mode restore... that may kill
3914 * X or at least garbage the screen but would also make the Oops visible...
3915 */
3916void unblank_screen(void)
3917{
3918        do_unblank_screen(0);
3919}
3920
3921/*
3922 * We defer the timer blanking to work queue so it can take the console mutex
3923 * (console operations can still happen at irq time, but only from printk which
3924 * has the console mutex. Not perfect yet, but better than no locking
3925 */
3926static void blank_screen_t(unsigned long dummy)
3927{
3928        if (unlikely(!keventd_up())) {
3929                mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3930                return;
3931        }
3932        blank_timer_expired = 1;
3933        schedule_work(&console_work);
3934}
3935
3936void poke_blanked_console(void)
3937{
3938        WARN_CONSOLE_UNLOCKED();
3939
3940        /* Add this so we quickly catch whoever might call us in a non
3941         * safe context. Nowadays, unblank_screen() isn't to be called in
3942         * atomic contexts and is allowed to schedule (with the special case
3943         * of oops_in_progress, but that isn't of any concern for this
3944         * function. --BenH.
3945         */
3946        might_sleep();
3947
3948        /* This isn't perfectly race free, but a race here would be mostly harmless,
3949         * at worse, we'll do a spurrious blank and it's unlikely
3950         */
3951        del_timer(&console_timer);
3952        blank_timer_expired = 0;
3953
3954        if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3955                return;
3956        if (console_blanked)
3957                unblank_screen();
3958        else if (blankinterval) {
3959                mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3960                blank_state = blank_normal_wait;
3961        }
3962}
3963
3964/*
3965 *      Palettes
3966 */
3967
3968static void set_palette(struct vc_data *vc)
3969{
3970        WARN_CONSOLE_UNLOCKED();
3971
3972        if (vc->vc_mode != KD_GRAPHICS)
3973                vc->vc_sw->con_set_palette(vc, color_table);
3974}
3975
3976/*
3977 * Load palette into the DAC registers. arg points to a colour
3978 * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3979 */
3980
3981int con_set_cmap(unsigned char __user *arg)
3982{
3983        int i, j, k;
3984        unsigned char colormap[3*16];
3985
3986        if (copy_from_user(colormap, arg, sizeof(colormap)))
3987                return -EFAULT;
3988
3989        console_lock();
3990        for (i = k = 0; i < 16; i++) {
3991                default_red[i] = colormap[k++];
3992                default_grn[i] = colormap[k++];
3993                default_blu[i] = colormap[k++];
3994        }
3995        for (i = 0; i < MAX_NR_CONSOLES; i++) {
3996                if (!vc_cons_allocated(i))
3997                        continue;
3998                for (j = k = 0; j < 16; j++) {
3999                        vc_cons[i].d->vc_palette[k++] = default_red[j];
4000                        vc_cons[i].d->vc_palette[k++] = default_grn[j];
4001                        vc_cons[i].d->vc_palette[k++] = default_blu[j];
4002                }
4003                set_palette(vc_cons[i].d);
4004        }
4005        console_unlock();
4006
4007        return 0;
4008}
4009
4010int con_get_cmap(unsigned char __user *arg)
4011{
4012        int i, k;
4013        unsigned char colormap[3*16];
4014
4015        console_lock();
4016        for (i = k = 0; i < 16; i++) {
4017                colormap[k++] = default_red[i];
4018                colormap[k++] = default_grn[i];
4019                colormap[k++] = default_blu[i];
4020        }
4021        console_unlock();
4022
4023        if (copy_to_user(arg, colormap, sizeof(colormap)))
4024                return -EFAULT;
4025
4026        return 0;
4027}
4028
4029void reset_palette(struct vc_data *vc)
4030{
4031        int j, k;
4032        for (j=k=0; j<16; j++) {
4033                vc->vc_palette[k++] = default_red[j];
4034                vc->vc_palette[k++] = default_grn[j];
4035                vc->vc_palette[k++] = default_blu[j];
4036        }
4037        set_palette(vc);
4038}
4039
4040/*
4041 *  Font switching
4042 *
4043 *  Currently we only support fonts up to 32 pixels wide, at a maximum height
4044 *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints, 
4045 *  depending on width) reserved for each character which is kinda wasty, but 
4046 *  this is done in order to maintain compatibility with the EGA/VGA fonts. It 
4047 *  is up to the actual low-level console-driver convert data into its favorite
4048 *  format (maybe we should add a `fontoffset' field to the `display'
4049 *  structure so we won't have to convert the fontdata all the time.
4050 *  /Jes
4051 */
4052
4053#define max_font_size 65536
4054
4055static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4056{
4057        struct console_font font;
4058        int rc = -EINVAL;
4059        int c;
4060
4061        if (op->data) {
4062                font.data = kmalloc(max_font_size, GFP_KERNEL);
4063                if (!font.data)
4064                        return -ENOMEM;
4065        } else
4066                font.data = NULL;
4067
4068        console_lock();
4069        if (vc->vc_mode != KD_TEXT)
4070                rc = -EINVAL;
4071        else if (vc->vc_sw->con_font_get)
4072                rc = vc->vc_sw->con_font_get(vc, &font);
4073        else
4074                rc = -ENOSYS;
4075        console_unlock();
4076
4077        if (rc)
4078                goto out;
4079
4080        c = (font.width+7)/8 * 32 * font.charcount;
4081
4082        if (op->data && font.charcount > op->charcount)
4083                rc = -ENOSPC;
4084        if (!(op->flags & KD_FONT_FLAG_OLD)) {
4085                if (font.width > op->width || font.height > op->height) 
4086                        rc = -ENOSPC;
4087        } else {
4088                if (font.width != 8)
4089                        rc = -EIO;
4090                else if ((op->height && font.height > op->height) ||
4091                         font.height > 32)
4092                        rc = -ENOSPC;
4093        }
4094        if (rc)
4095                goto out;
4096
4097        op->height = font.height;
4098        op->width = font.width;
4099        op->charcount = font.charcount;
4100
4101        if (op->data && copy_to_user(op->data, font.data, c))
4102                rc = -EFAULT;
4103
4104out:
4105        kfree(font.data);
4106        return rc;
4107}
4108
4109static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4110{
4111        struct console_font font;
4112        int rc = -EINVAL;
4113        int size;
4114
4115        if (vc->vc_mode != KD_TEXT)
4116                return -EINVAL;
4117        if (!op->data)
4118                return -EINVAL;
4119        if (op->charcount > 512)
4120                return -EINVAL;
4121        if (!op->height) {              /* Need to guess font height [compat] */
4122                int h, i;
4123                u8 __user *charmap = op->data;
4124                u8 tmp;
4125                
4126                /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4127                   so that we can get rid of this soon */
4128                if (!(op->flags & KD_FONT_FLAG_OLD))
4129                        return -EINVAL;
4130                for (h = 32; h > 0; h--)
4131                        for (i = 0; i < op->charcount; i++) {
4132                                if (get_user(tmp, &charmap[32*i+h-1]))
4133                                        return -EFAULT;
4134                                if (tmp)
4135                                        goto nonzero;
4136                        }
4137                return -EINVAL;
4138        nonzero:
4139                op->height = h;
4140        }
4141        if (op->width <= 0 || op->width > 32 || op->height > 32)
4142                return -EINVAL;
4143        size = (op->width+7)/8 * 32 * op->charcount;
4144        if (size > max_font_size)
4145                return -ENOSPC;
4146        font.charcount = op->charcount;
4147        font.height = op->height;
4148        font.width = op->width;
4149        font.data = memdup_user(op->data, size);
4150        if (IS_ERR(font.data))
4151                return PTR_ERR(font.data);
4152        console_lock();
4153        if (vc->vc_mode != KD_TEXT)
4154                rc = -EINVAL;
4155        else if (vc->vc_sw->con_font_set)
4156                rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4157        else
4158                rc = -ENOSYS;
4159        console_unlock();
4160        kfree(font.data);
4161        return rc;
4162}
4163
4164static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4165{
4166        struct console_font font = {.width = op->width, .height = op->height};
4167        char name[MAX_FONT_NAME];
4168        char *s = name;
4169        int rc;
4170
4171
4172        if (!op->data)
4173                s = NULL;
4174        else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4175                return -EFAULT;
4176        else
4177                name[MAX_FONT_NAME - 1] = 0;
4178
4179        console_lock();
4180        if (vc->vc_mode != KD_TEXT) {
4181                console_unlock();
4182                return -EINVAL;
4183        }
4184        if (vc->vc_sw->con_font_default)
4185                rc = vc->vc_sw->con_font_default(vc, &font, s);
4186        else
4187                rc = -ENOSYS;
4188        console_unlock();
4189        if (!rc) {
4190                op->width = font.width;
4191                op->height = font.height;
4192        }
4193        return rc;
4194}
4195
4196static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4197{
4198        int con = op->height;
4199        int rc;
4200
4201
4202        console_lock();
4203        if (vc->vc_mode != KD_TEXT)
4204                rc = -EINVAL;
4205        else if (!vc->vc_sw->con_font_copy)
4206                rc = -ENOSYS;
4207        else if (con < 0 || !vc_cons_allocated(con))
4208                rc = -ENOTTY;
4209        else if (con == vc->vc_num)     /* nothing to do */
4210                rc = 0;
4211        else
4212                rc = vc->vc_sw->con_font_copy(vc, con);
4213        console_unlock();
4214        return rc;
4215}
4216
4217int con_font_op(struct vc_data *vc, struct console_font_op *op)
4218{
4219        switch (op->op) {
4220        case KD_FONT_OP_SET:
4221                return con_font_set(vc, op);
4222        case KD_FONT_OP_GET:
4223                return con_font_get(vc, op);
4224        case KD_FONT_OP_SET_DEFAULT:
4225                return con_font_default(vc, op);
4226        case KD_FONT_OP_COPY:
4227                return con_font_copy(vc, op);
4228        }
4229        return -ENOSYS;
4230}
4231
4232/*
4233 *      Interface exported to selection and vcs.
4234 */
4235
4236/* used by selection */
4237u16 screen_glyph(struct vc_data *vc, int offset)
4238{
4239        u16 w = scr_readw(screenpos(vc, offset, 1));
4240        u16 c = w & 0xff;
4241
4242        if (w & vc->vc_hi_font_mask)
4243                c |= 0x100;
4244        return c;
4245}
4246EXPORT_SYMBOL_GPL(screen_glyph);
4247
4248/* used by vcs - note the word offset */
4249unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4250{
4251        return screenpos(vc, 2 * w_offset, viewed);
4252}
4253
4254void getconsxy(struct vc_data *vc, unsigned char *p)
4255{
4256        p[0] = vc->vc_x;
4257        p[1] = vc->vc_y;
4258}
4259
4260void putconsxy(struct vc_data *vc, unsigned char *p)
4261{
4262        hide_cursor(vc);
4263        gotoxy(vc, p[0], p[1]);
4264        set_cursor(vc);
4265}
4266
4267u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4268{
4269        if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4270                return softcursor_original;
4271        return scr_readw(org);
4272}
4273
4274void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4275{
4276        scr_writew(val, org);
4277        if ((unsigned long)org == vc->vc_pos) {
4278                softcursor_original = -1;
4279                add_softcursor(vc);
4280        }
4281}
4282
4283void vcs_scr_updated(struct vc_data *vc)
4284{
4285        notify_update(vc);
4286}
4287
4288/*
4289 *      Visible symbols for modules
4290 */
4291
4292EXPORT_SYMBOL(color_table);
4293EXPORT_SYMBOL(default_red);
4294EXPORT_SYMBOL(default_grn);
4295EXPORT_SYMBOL(default_blu);
4296EXPORT_SYMBOL(update_region);
4297EXPORT_SYMBOL(redraw_screen);
4298EXPORT_SYMBOL(vc_resize);
4299EXPORT_SYMBOL(fg_console);
4300EXPORT_SYMBOL(console_blank_hook);
4301EXPORT_SYMBOL(console_blanked);
4302EXPORT_SYMBOL(vc_cons);
4303EXPORT_SYMBOL(global_cursor_default);
4304#ifndef VT_SINGLE_DRIVER
4305EXPORT_SYMBOL(give_up_console);
4306#endif
4307