root/drivers/tty/vt/vt.c

DEFINITIONS

1. register_vt_notifier
2. unregister_vt_notifier
3. notify_write
4. notify_update
5. con_is_fg
6. con_should_update
7. screenpos
8. scrolldelta
9. schedule_console_callback
10. vc_uniscr_alloc
11. vc_uniscr_free
12. vc_uniscr_set
13. vc_uniscr_putc
14. vc_uniscr_insert
15. vc_uniscr_delete
16. vc_uniscr_clear_line
17. vc_uniscr_clear_lines
18. vc_uniscr_scroll
19. vc_uniscr_copy_area
20. vc_uniscr_check
21. vc_uniscr_copy_line
22. vc_uniscr_debug_check
23. con_scroll
24. do_update_region
25. update_region
26. build_attr
27. update_attr
28. invert_screen
29. complement_pos
30. insert_char
31. delete_char
32. add_softcursor
33. hide_softcursor
34. hide_cursor
35. set_cursor
36. set_origin
37. save_screen
38. flush_scrollback
39. clear_buffer_attributes
40. redraw_screen
41. vc_cons_allocated
42. visual_init
43. visual_deinit
44. vc_port_destruct
45. vc_allocate
46. resize_screen
47. vc_do_resize
48. vc_resize
49. vt_resize
50. vc_deallocate
51. gotoxy
52. gotoxay
53. scrollback
54. scrollfront
55. lf
56. ri
57. cr
58. bs
59. del
60. csi_J
61. csi_K
62. csi_X
63. default_attr
64. rgb_from_256
65. rgb_foreground
66. rgb_background
67. vc_t416_color
68. csi_m
69. respond_string
70. cursor_report
71. status_report
72. respond_ID
73. mouse_report
74. mouse_reporting
75. set_mode
76. setterm_command
77. csi_at
78. csi_L
79. csi_P
80. csi_M
81. save_cur
82. restore_cur
83. reset_terminal
84. do_con_trol
85. ucs_cmp
86. is_double_width
87. con_flush
88. do_con_write
89. console_callback
90. set_console
91. vt_kmsg_redirect
92. vt_console_print
93. vt_console_device
94. tioclinux
95. con_write
96. con_put_char
97. con_write_room
98. con_chars_in_buffer
99. con_throttle
100. con_unthrottle
101. con_stop
102. con_start
103. con_flush_chars
104. con_install
105. con_open
106. con_close
107. con_shutdown
108. con_cleanup
109. vc_init
110. con_init
111. show_tty_active
112. vty_init
113. do_bind_con_driver
114. do_unbind_con_driver
115. vt_bind
116. vt_unbind
117. vt_bind
118. vt_unbind
119. store_bind
120. show_bind
121. show_name
122. vtconsole_init_device
123. vtconsole_deinit_device
124. con_is_bound
125. con_is_visible
126. con_debug_enter
127. con_debug_leave
128. do_register_con_driver
129. do_unregister_con_driver
130. con_driver_unregister_callback
131. do_take_over_console
132. give_up_console
133. vtconsole_class_init
134. set_vesa_blanking
135. do_blank_screen
136. do_unblank_screen
137. unblank_screen
138. blank_screen_t
139. poke_blanked_console
140. set_palette
141. con_set_cmap
142. con_get_cmap
143. reset_palette
144. con_font_get
145. con_font_set
146. con_font_default
147. con_font_copy
148. con_font_op
149. screen_glyph
150. screen_glyph_unicode
151. screen_pos
152. getconsxy
153. putconsxy
154. vcs_scr_readw
155. vcs_scr_writew
156. vcs_scr_updated
157. vc_scrolldelta_helper

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  Copyright (C) 1991, 1992  Linus Torvalds
   4  */
   5 
   6 /*
   7  * Hopefully this will be a rather complete VT102 implementation.
   8  *
   9  * Beeping thanks to John T Kohl.
  10  *
  11  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  12  *   Chars, and VT100 enhancements by Peter MacDonald.
  13  *
  14  * Copy and paste function by Andrew Haylett,
  15  *   some enhancements by Alessandro Rubini.
  16  *
  17  * Code to check for different video-cards mostly by Galen Hunt,
  18  * <g-hunt@ee.utah.edu>
  19  *
  20  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  21  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
  22  *
  23  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
  24  * Resizing of consoles, aeb, 940926
  25  *
  26  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  27  * <poe@daimi.aau.dk>
  28  *
  29  * User-defined bell sound, new setterm control sequences and printk
  30  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
  31  *
  32  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
  33  *
  34  * Merge with the abstract console driver by Geert Uytterhoeven
  35  * <geert@linux-m68k.org>, Jan 1997.
  36  *
  37  *   Original m68k console driver modifications by
  38  *
  39  *     - Arno Griffioen <arno@usn.nl>
  40  *     - David Carter <carter@cs.bris.ac.uk>
  41  * 
  42  *   The abstract console driver provides a generic interface for a text
  43  *   console. It supports VGA text mode, frame buffer based graphical consoles
  44  *   and special graphics processors that are only accessible through some
  45  *   registers (e.g. a TMS340x0 GSP).
  46  *
  47  *   The interface to the hardware is specified using a special structure
  48  *   (struct consw) which contains function pointers to console operations
  49  *   (see <linux/console.h> for more information).
  50  *
  51  * Support for changeable cursor shape
  52  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
  53  *
  54  * Ported to i386 and con_scrolldelta fixed
  55  * by Emmanuel Marty <core@ggi-project.org>, April 1998
  56  *
  57  * Resurrected character buffers in videoram plus lots of other trickery
  58  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  59  *
  60  * Removed old-style timers, introduced console_timer, made timer
  61  * deletion SMP-safe.  17Jun00, Andrew Morton
  62  *
  63  * Removed console_lock, enabled interrupts across all console operations
  64  * 13 March 2001, Andrew Morton
  65  *
  66  * Fixed UTF-8 mode so alternate charset modes always work according
  67  * to control sequences interpreted in do_con_trol function
  68  * preserving backward VT100 semigraphics compatibility,
  69  * malformed UTF sequences represented as sequences of replacement glyphs,
  70  * original codes or '?' as a last resort if replacement glyph is undefined
  71  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
  72  */
  73 
  74 #include <linux/module.h>
  75 #include <linux/types.h>
  76 #include <linux/sched/signal.h>
  77 #include <linux/tty.h>
  78 #include <linux/tty_flip.h>
  79 #include <linux/kernel.h>
  80 #include <linux/string.h>
  81 #include <linux/errno.h>
  82 #include <linux/kd.h>
  83 #include <linux/slab.h>
  84 #include <linux/vmalloc.h>
  85 #include <linux/major.h>
  86 #include <linux/mm.h>
  87 #include <linux/console.h>
  88 #include <linux/init.h>
  89 #include <linux/mutex.h>
  90 #include <linux/vt_kern.h>
  91 #include <linux/selection.h>
  92 #include <linux/tiocl.h>
  93 #include <linux/kbd_kern.h>
  94 #include <linux/consolemap.h>
  95 #include <linux/timer.h>
  96 #include <linux/interrupt.h>
  97 #include <linux/workqueue.h>
  98 #include <linux/pm.h>
  99 #include <linux/font.h>
 100 #include <linux/bitops.h>
 101 #include <linux/notifier.h>
 102 #include <linux/device.h>
 103 #include <linux/io.h>
 104 #include <linux/uaccess.h>
 105 #include <linux/kdb.h>
 106 #include <linux/ctype.h>
 107 #include <linux/bsearch.h>
 108 #include <linux/gcd.h>
 109 
 110 #define MAX_NR_CON_DRIVER 16
 111 
 112 #define CON_DRIVER_FLAG_MODULE 1
 113 #define CON_DRIVER_FLAG_INIT   2
 114 #define CON_DRIVER_FLAG_ATTR   4
 115 #define CON_DRIVER_FLAG_ZOMBIE 8
 116 
 117 struct con_driver {
 118         const struct consw *con;
 119         const char *desc;
 120         struct device *dev;
 121         int node;
 122         int first;
 123         int last;
 124         int flag;
 125 };
 126 
 127 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 128 const struct consw *conswitchp;
 129 
 130 /* A bitmap for codes <32. A bit of 1 indicates that the code
 131  * corresponding to that bit number invokes some special action
 132  * (such as cursor movement) and should not be displayed as a
 133  * glyph unless the disp_ctrl mode is explicitly enabled.
 134  */
 135 #define CTRL_ACTION 0x0d00ff81
 136 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 137 
 138 /*
 139  * Here is the default bell parameters: 750HZ, 1/8th of a second
 140  */
 141 #define DEFAULT_BELL_PITCH      750
 142 #define DEFAULT_BELL_DURATION   (HZ/8)
 143 #define DEFAULT_CURSOR_BLINK_MS 200
 144 
 145 struct vc vc_cons [MAX_NR_CONSOLES];
 146 
 147 #ifndef VT_SINGLE_DRIVER
 148 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 149 #endif
 150 
 151 static int con_open(struct tty_struct *, struct file *);
 152 static void vc_init(struct vc_data *vc, unsigned int rows,
 153                     unsigned int cols, int do_clear);
 154 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 155 static void save_cur(struct vc_data *vc);
 156 static void reset_terminal(struct vc_data *vc, int do_clear);
 157 static void con_flush_chars(struct tty_struct *tty);
 158 static int set_vesa_blanking(char __user *p);
 159 static void set_cursor(struct vc_data *vc);
 160 static void hide_cursor(struct vc_data *vc);
 161 static void console_callback(struct work_struct *ignored);
 162 static void con_driver_unregister_callback(struct work_struct *ignored);
 163 static void blank_screen_t(struct timer_list *unused);
 164 static void set_palette(struct vc_data *vc);
 165 
 166 #define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
 167 
 168 static int printable;           /* Is console ready for printing? */
 169 int default_utf8 = true;
 170 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 171 int global_cursor_default = -1;
 172 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
 173 
 174 static int cur_default = CUR_DEFAULT;
 175 module_param(cur_default, int, S_IRUGO | S_IWUSR);
 176 
 177 /*
 178  * ignore_poke: don't unblank the screen when things are typed.  This is
 179  * mainly for the privacy of braille terminal users.
 180  */
 181 static int ignore_poke;
 182 
 183 int do_poke_blanked_console;
 184 int console_blanked;
 185 
 186 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 187 static int vesa_off_interval;
 188 static int blankinterval;
 189 core_param(consoleblank, blankinterval, int, 0444);
 190 
 191 static DECLARE_WORK(console_work, console_callback);
 192 static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
 193 
 194 /*
 195  * fg_console is the current virtual console,
 196  * last_console is the last used one,
 197  * want_console is the console we want to switch to,
 198  * saved_* variants are for save/restore around kernel debugger enter/leave
 199  */
 200 int fg_console;
 201 int last_console;
 202 int want_console = -1;
 203 static int saved_fg_console;
 204 static int saved_last_console;
 205 static int saved_want_console;
 206 static int saved_vc_mode;
 207 static int saved_console_blanked;
 208 
 209 /*
 210  * For each existing display, we have a pointer to console currently visible
 211  * on that display, allowing consoles other than fg_console to be refreshed
 212  * appropriately. Unless the low-level driver supplies its own display_fg
 213  * variable, we use this one for the "master display".
 214  */
 215 static struct vc_data *master_display_fg;
 216 
 217 /*
 218  * Unfortunately, we need to delay tty echo when we're currently writing to the
 219  * console since the code is (and always was) not re-entrant, so we schedule
 220  * all flip requests to process context with schedule-task() and run it from
 221  * console_callback().
 222  */
 223 
 224 /*
 225  * For the same reason, we defer scrollback to the console callback.
 226  */
 227 static int scrollback_delta;
 228 
 229 /*
 230  * Hook so that the power management routines can (un)blank
 231  * the console on our behalf.
 232  */
 233 int (*console_blank_hook)(int);
 234 
 235 static DEFINE_TIMER(console_timer, blank_screen_t);
 236 static int blank_state;
 237 static int blank_timer_expired;
 238 enum {
 239         blank_off = 0,
 240         blank_normal_wait,
 241         blank_vesa_wait,
 242 };
 243 
 244 /*
 245  * /sys/class/tty/tty0/
 246  *
 247  * the attribute 'active' contains the name of the current vc
 248  * console and it supports poll() to detect vc switches
 249  */
 250 static struct device *tty0dev;
 251 
 252 /*
 253  * Notifier list for console events.
 254  */
 255 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 256 
 257 int register_vt_notifier(struct notifier_block *nb)
 258 {
 259         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 260 }
 261 EXPORT_SYMBOL_GPL(register_vt_notifier);
 262 
 263 int unregister_vt_notifier(struct notifier_block *nb)
 264 {
 265         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 266 }
 267 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 268 
 269 static void notify_write(struct vc_data *vc, unsigned int unicode)
 270 {
 271         struct vt_notifier_param param = { .vc = vc, .c = unicode };
 272         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 273 }
 274 
 275 static void notify_update(struct vc_data *vc)
 276 {
 277         struct vt_notifier_param param = { .vc = vc };
 278         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 279 }
 280 /*
 281  *      Low-Level Functions
 282  */
 283 
 284 static inline bool con_is_fg(const struct vc_data *vc)
 285 {
 286         return vc->vc_num == fg_console;
 287 }
 288 
 289 static inline bool con_should_update(const struct vc_data *vc)
 290 {
 291         return con_is_visible(vc) && !console_blanked;
 292 }
 293 
 294 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 295 {
 296         unsigned short *p;
 297         
 298         if (!viewed)
 299                 p = (unsigned short *)(vc->vc_origin + offset);
 300         else if (!vc->vc_sw->con_screen_pos)
 301                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 302         else
 303                 p = vc->vc_sw->con_screen_pos(vc, offset);
 304         return p;
 305 }
 306 
 307 /* Called  from the keyboard irq path.. */
 308 static inline void scrolldelta(int lines)
 309 {
 310         /* FIXME */
 311         /* scrolldelta needs some kind of consistency lock, but the BKL was
 312            and still is not protecting versus the scheduled back end */
 313         scrollback_delta += lines;
 314         schedule_console_callback();
 315 }
 316 
 317 void schedule_console_callback(void)
 318 {
 319         schedule_work(&console_work);
 320 }
 321 
 322 /*
 323  * Code to manage unicode-based screen buffers
 324  */
 325 
 326 #ifdef NO_VC_UNI_SCREEN
 327 /* this disables and optimizes related code away at compile time */
 328 #define get_vc_uniscr(vc) NULL
 329 #else
 330 #define get_vc_uniscr(vc) vc->vc_uni_screen
 331 #endif
 332 
 333 #define VC_UNI_SCREEN_DEBUG 0
 334 
 335 typedef uint32_t char32_t;
 336 
 337 /*
 338  * Our screen buffer is preceded by an array of line pointers so that
 339  * scrolling only implies some pointer shuffling.
 340  */
 341 struct uni_screen {
 342         char32_t *lines[0];
 343 };
 344 
 345 static struct uni_screen *vc_uniscr_alloc(unsigned int cols, unsigned int rows)
 346 {
 347         struct uni_screen *uniscr;
 348         void *p;
 349         unsigned int memsize, i;
 350 
 351         /* allocate everything in one go */
 352         memsize = cols * rows * sizeof(char32_t);
 353         memsize += rows * sizeof(char32_t *);
 354         p = vmalloc(memsize);
 355         if (!p)
 356                 return NULL;
 357 
 358         /* initial line pointers */
 359         uniscr = p;
 360         p = uniscr->lines + rows;
 361         for (i = 0; i < rows; i++) {
 362                 uniscr->lines[i] = p;
 363                 p += cols * sizeof(char32_t);
 364         }
 365         return uniscr;
 366 }
 367 
 368 static void vc_uniscr_free(struct uni_screen *uniscr)
 369 {
 370         vfree(uniscr);
 371 }
 372 
 373 static void vc_uniscr_set(struct vc_data *vc, struct uni_screen *new_uniscr)
 374 {
 375         vc_uniscr_free(vc->vc_uni_screen);
 376         vc->vc_uni_screen = new_uniscr;
 377 }
 378 
 379 static void vc_uniscr_putc(struct vc_data *vc, char32_t uc)
 380 {
 381         struct uni_screen *uniscr = get_vc_uniscr(vc);
 382 
 383         if (uniscr)
 384                 uniscr->lines[vc->vc_y][vc->vc_x] = uc;
 385 }
 386 
 387 static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
 388 {
 389         struct uni_screen *uniscr = get_vc_uniscr(vc);
 390 
 391         if (uniscr) {
 392                 char32_t *ln = uniscr->lines[vc->vc_y];
 393                 unsigned int x = vc->vc_x, cols = vc->vc_cols;
 394 
 395                 memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
 396                 memset32(&ln[x], ' ', nr);
 397         }
 398 }
 399 
 400 static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
 401 {
 402         struct uni_screen *uniscr = get_vc_uniscr(vc);
 403 
 404         if (uniscr) {
 405                 char32_t *ln = uniscr->lines[vc->vc_y];
 406                 unsigned int x = vc->vc_x, cols = vc->vc_cols;
 407 
 408                 memcpy(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
 409                 memset32(&ln[cols - nr], ' ', nr);
 410         }
 411 }
 412 
 413 static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
 414                                  unsigned int nr)
 415 {
 416         struct uni_screen *uniscr = get_vc_uniscr(vc);
 417 
 418         if (uniscr) {
 419                 char32_t *ln = uniscr->lines[vc->vc_y];
 420 
 421                 memset32(&ln[x], ' ', nr);
 422         }
 423 }
 424 
 425 static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
 426                                   unsigned int nr)
 427 {
 428         struct uni_screen *uniscr = get_vc_uniscr(vc);
 429 
 430         if (uniscr) {
 431                 unsigned int cols = vc->vc_cols;
 432 
 433                 while (nr--)
 434                         memset32(uniscr->lines[y++], ' ', cols);
 435         }
 436 }
 437 
 438 static void vc_uniscr_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
 439                              enum con_scroll dir, unsigned int nr)
 440 {
 441         struct uni_screen *uniscr = get_vc_uniscr(vc);
 442 
 443         if (uniscr) {
 444                 unsigned int i, j, k, sz, d, clear;
 445 
 446                 sz = b - t;
 447                 clear = b - nr;
 448                 d = nr;
 449                 if (dir == SM_DOWN) {
 450                         clear = t;
 451                         d = sz - nr;
 452                 }
 453                 for (i = 0; i < gcd(d, sz); i++) {
 454                         char32_t *tmp = uniscr->lines[t + i];
 455                         j = i;
 456                         while (1) {
 457                                 k = j + d;
 458                                 if (k >= sz)
 459                                         k -= sz;
 460                                 if (k == i)
 461                                         break;
 462                                 uniscr->lines[t + j] = uniscr->lines[t + k];
 463                                 j = k;
 464                         }
 465                         uniscr->lines[t + j] = tmp;
 466                 }
 467                 vc_uniscr_clear_lines(vc, clear, nr);
 468         }
 469 }
 470 
 471 static void vc_uniscr_copy_area(struct uni_screen *dst,
 472                                 unsigned int dst_cols,
 473                                 unsigned int dst_rows,
 474                                 struct uni_screen *src,
 475                                 unsigned int src_cols,
 476                                 unsigned int src_top_row,
 477                                 unsigned int src_bot_row)
 478 {
 479         unsigned int dst_row = 0;
 480 
 481         if (!dst)
 482                 return;
 483 
 484         while (src_top_row < src_bot_row) {
 485                 char32_t *src_line = src->lines[src_top_row];
 486                 char32_t *dst_line = dst->lines[dst_row];
 487 
 488                 memcpy(dst_line, src_line, src_cols * sizeof(char32_t));
 489                 if (dst_cols - src_cols)
 490                         memset32(dst_line + src_cols, ' ', dst_cols - src_cols);
 491                 src_top_row++;
 492                 dst_row++;
 493         }
 494         while (dst_row < dst_rows) {
 495                 char32_t *dst_line = dst->lines[dst_row];
 496 
 497                 memset32(dst_line, ' ', dst_cols);
 498                 dst_row++;
 499         }
 500 }
 501 
 502 /*
 503  * Called from vcs_read() to make sure unicode screen retrieval is possible.
 504  * This will initialize the unicode screen buffer if not already done.
 505  * This returns 0 if OK, or a negative error code otherwise.
 506  * In particular, -ENODATA is returned if the console is not in UTF-8 mode.
 507  */
 508 int vc_uniscr_check(struct vc_data *vc)
 509 {
 510         struct uni_screen *uniscr;
 511         unsigned short *p;
 512         int x, y, mask;
 513 
 514         if (__is_defined(NO_VC_UNI_SCREEN))
 515                 return -EOPNOTSUPP;
 516 
 517         WARN_CONSOLE_UNLOCKED();
 518 
 519         if (!vc->vc_utf)
 520                 return -ENODATA;
 521 
 522         if (vc->vc_uni_screen)
 523                 return 0;
 524 
 525         uniscr = vc_uniscr_alloc(vc->vc_cols, vc->vc_rows);
 526         if (!uniscr)
 527                 return -ENOMEM;
 528 
 529         /*
 530          * Let's populate it initially with (imperfect) reverse translation.
 531          * This is the next best thing we can do short of having it enabled
 532          * from the start even when no users rely on this functionality. True
 533          * unicode content will be available after a complete screen refresh.
 534          */
 535         p = (unsigned short *)vc->vc_origin;
 536         mask = vc->vc_hi_font_mask | 0xff;
 537         for (y = 0; y < vc->vc_rows; y++) {
 538                 char32_t *line = uniscr->lines[y];
 539                 for (x = 0; x < vc->vc_cols; x++) {
 540                         u16 glyph = scr_readw(p++) & mask;
 541                         line[x] = inverse_translate(vc, glyph, true);
 542                 }
 543         }
 544 
 545         vc->vc_uni_screen = uniscr;
 546         return 0;
 547 }
 548 
 549 /*
 550  * Called from vcs_read() to get the unicode data from the screen.
 551  * This must be preceded by a successful call to vc_uniscr_check() once
 552  * the console lock has been taken.
 553  */
 554 void vc_uniscr_copy_line(struct vc_data *vc, void *dest, int viewed,
 555                          unsigned int row, unsigned int col, unsigned int nr)
 556 {
 557         struct uni_screen *uniscr = get_vc_uniscr(vc);
 558         int offset = row * vc->vc_size_row + col * 2;
 559         unsigned long pos;
 560 
 561         BUG_ON(!uniscr);
 562 
 563         pos = (unsigned long)screenpos(vc, offset, viewed);
 564         if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
 565                 /*
 566                  * Desired position falls in the main screen buffer.
 567                  * However the actual row/col might be different if
 568                  * scrollback is active.
 569                  */
 570                 row = (pos - vc->vc_origin) / vc->vc_size_row;
 571                 col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
 572                 memcpy(dest, &uniscr->lines[row][col], nr * sizeof(char32_t));
 573         } else {
 574                 /*
 575                  * Scrollback is active. For now let's simply backtranslate
 576                  * the screen glyphs until the unicode screen buffer does
 577                  * synchronize with console display drivers for a scrollback
 578                  * buffer of its own.
 579                  */
 580                 u16 *p = (u16 *)pos;
 581                 int mask = vc->vc_hi_font_mask | 0xff;
 582                 char32_t *uni_buf = dest;
 583                 while (nr--) {
 584                         u16 glyph = scr_readw(p++) & mask;
 585                         *uni_buf++ = inverse_translate(vc, glyph, true);
 586                 }
 587         }
 588 }
 589 
 590 /* this is for validation and debugging only */
 591 static void vc_uniscr_debug_check(struct vc_data *vc)
 592 {
 593         struct uni_screen *uniscr = get_vc_uniscr(vc);
 594         unsigned short *p;
 595         int x, y, mask;
 596 
 597         if (!VC_UNI_SCREEN_DEBUG || !uniscr)
 598                 return;
 599 
 600         WARN_CONSOLE_UNLOCKED();
 601 
 602         /*
 603          * Make sure our unicode screen translates into the same glyphs
 604          * as the actual screen. This is brutal indeed.
 605          */
 606         p = (unsigned short *)vc->vc_origin;
 607         mask = vc->vc_hi_font_mask | 0xff;
 608         for (y = 0; y < vc->vc_rows; y++) {
 609                 char32_t *line = uniscr->lines[y];
 610                 for (x = 0; x < vc->vc_cols; x++) {
 611                         u16 glyph = scr_readw(p++) & mask;
 612                         char32_t uc = line[x];
 613                         int tc = conv_uni_to_pc(vc, uc);
 614                         if (tc == -4)
 615                                 tc = conv_uni_to_pc(vc, 0xfffd);
 616                         if (tc == -4)
 617                                 tc = conv_uni_to_pc(vc, '?');
 618                         if (tc != glyph)
 619                                 pr_err_ratelimited(
 620                                         "%s: mismatch at %d,%d: glyph=%#x tc=%#x\n",
 621                                         __func__, x, y, glyph, tc);
 622                 }
 623         }
 624 }
 625 
 626 
 627 static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
 628                 enum con_scroll dir, unsigned int nr)
 629 {
 630         u16 *clear, *d, *s;
 631 
 632         if (t + nr >= b)
 633                 nr = b - t - 1;
 634         if (b > vc->vc_rows || t >= b || nr < 1)
 635                 return;
 636         vc_uniscr_scroll(vc, t, b, dir, nr);
 637         if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
 638                 return;
 639 
 640         s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
 641         d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 642 
 643         if (dir == SM_UP) {
 644                 clear = s + (b - t - nr) * vc->vc_cols;
 645                 swap(s, d);
 646         }
 647         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 648         scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
 649 }
 650 
 651 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 652 {
 653         unsigned int xx, yy, offset;
 654         u16 *p;
 655 
 656         p = (u16 *) start;
 657         if (!vc->vc_sw->con_getxy) {
 658                 offset = (start - vc->vc_origin) / 2;
 659                 xx = offset % vc->vc_cols;
 660                 yy = offset / vc->vc_cols;
 661         } else {
 662                 int nxx, nyy;
 663                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 664                 xx = nxx; yy = nyy;
 665         }
 666         for(;;) {
 667                 u16 attrib = scr_readw(p) & 0xff00;
 668                 int startx = xx;
 669                 u16 *q = p;
 670                 while (xx < vc->vc_cols && count) {
 671                         if (attrib != (scr_readw(p) & 0xff00)) {
 672                                 if (p > q)
 673                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 674                                 startx = xx;
 675                                 q = p;
 676                                 attrib = scr_readw(p) & 0xff00;
 677                         }
 678                         p++;
 679                         xx++;
 680                         count--;
 681                 }
 682                 if (p > q)
 683                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 684                 if (!count)
 685                         break;
 686                 xx = 0;
 687                 yy++;
 688                 if (vc->vc_sw->con_getxy) {
 689                         p = (u16 *)start;
 690                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 691                 }
 692         }
 693 }
 694 
 695 void update_region(struct vc_data *vc, unsigned long start, int count)
 696 {
 697         WARN_CONSOLE_UNLOCKED();
 698 
 699         if (con_should_update(vc)) {
 700                 hide_cursor(vc);
 701                 do_update_region(vc, start, count);
 702                 set_cursor(vc);
 703         }
 704 }
 705 
 706 /* Structure of attributes is hardware-dependent */
 707 
 708 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 709     u8 _underline, u8 _reverse, u8 _italic)
 710 {
 711         if (vc->vc_sw->con_build_attr)
 712                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 713                        _blink, _underline, _reverse, _italic);
 714 
 715 /*
 716  * ++roman: I completely changed the attribute format for monochrome
 717  * mode (!can_do_color). The formerly used MDA (monochrome display
 718  * adapter) format didn't allow the combination of certain effects.
 719  * Now the attribute is just a bit vector:
 720  *  Bit 0..1: intensity (0..2)
 721  *  Bit 2   : underline
 722  *  Bit 3   : reverse
 723  *  Bit 7   : blink
 724  */
 725         {
 726         u8 a = _color;
 727         if (!vc->vc_can_do_color)
 728                 return _intensity |
 729                        (_italic ? 2 : 0) |
 730                        (_underline ? 4 : 0) |
 731                        (_reverse ? 8 : 0) |
 732                        (_blink ? 0x80 : 0);
 733         if (_italic)
 734                 a = (a & 0xF0) | vc->vc_itcolor;
 735         else if (_underline)
 736                 a = (a & 0xf0) | vc->vc_ulcolor;
 737         else if (_intensity == 0)
 738                 a = (a & 0xf0) | vc->vc_halfcolor;
 739         if (_reverse)
 740                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 741         if (_blink)
 742                 a ^= 0x80;
 743         if (_intensity == 2)
 744                 a ^= 0x08;
 745         if (vc->vc_hi_font_mask == 0x100)
 746                 a <<= 1;
 747         return a;
 748         }
 749 }
 750 
 751 static void update_attr(struct vc_data *vc)
 752 {
 753         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 754                       vc->vc_blink, vc->vc_underline,
 755                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 756         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 757 }
 758 
 759 /* Note: inverting the screen twice should revert to the original state */
 760 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 761 {
 762         unsigned short *p;
 763 
 764         WARN_CONSOLE_UNLOCKED();
 765 
 766         count /= 2;
 767         p = screenpos(vc, offset, viewed);
 768         if (vc->vc_sw->con_invert_region) {
 769                 vc->vc_sw->con_invert_region(vc, p, count);
 770         } else {
 771                 u16 *q = p;
 772                 int cnt = count;
 773                 u16 a;
 774 
 775                 if (!vc->vc_can_do_color) {
 776                         while (cnt--) {
 777                             a = scr_readw(q);
 778                             a ^= 0x0800;
 779                             scr_writew(a, q);
 780                             q++;
 781                         }
 782                 } else if (vc->vc_hi_font_mask == 0x100) {
 783                         while (cnt--) {
 784                                 a = scr_readw(q);
 785                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 786                                 scr_writew(a, q);
 787                                 q++;
 788                         }
 789                 } else {
 790                         while (cnt--) {
 791                                 a = scr_readw(q);
 792                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 793                                 scr_writew(a, q);
 794                                 q++;
 795                         }
 796                 }
 797         }
 798 
 799         if (con_should_update(vc))
 800                 do_update_region(vc, (unsigned long) p, count);
 801         notify_update(vc);
 802 }
 803 
 804 /* used by selection: complement pointer position */
 805 void complement_pos(struct vc_data *vc, int offset)
 806 {
 807         static int old_offset = -1;
 808         static unsigned short old;
 809         static unsigned short oldx, oldy;
 810 
 811         WARN_CONSOLE_UNLOCKED();
 812 
 813         if (old_offset != -1 && old_offset >= 0 &&
 814             old_offset < vc->vc_screenbuf_size) {
 815                 scr_writew(old, screenpos(vc, old_offset, 1));
 816                 if (con_should_update(vc))
 817                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 818                 notify_update(vc);
 819         }
 820 
 821         old_offset = offset;
 822 
 823         if (offset != -1 && offset >= 0 &&
 824             offset < vc->vc_screenbuf_size) {
 825                 unsigned short new;
 826                 unsigned short *p;
 827                 p = screenpos(vc, offset, 1);
 828                 old = scr_readw(p);
 829                 new = old ^ vc->vc_complement_mask;
 830                 scr_writew(new, p);
 831                 if (con_should_update(vc)) {
 832                         oldx = (offset >> 1) % vc->vc_cols;
 833                         oldy = (offset >> 1) / vc->vc_cols;
 834                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 835                 }
 836                 notify_update(vc);
 837         }
 838 }
 839 
 840 static void insert_char(struct vc_data *vc, unsigned int nr)
 841 {
 842         unsigned short *p = (unsigned short *) vc->vc_pos;
 843 
 844         vc_uniscr_insert(vc, nr);
 845         scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
 846         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 847         vc->vc_need_wrap = 0;
 848         if (con_should_update(vc))
 849                 do_update_region(vc, (unsigned long) p,
 850                         vc->vc_cols - vc->vc_x);
 851 }
 852 
 853 static void delete_char(struct vc_data *vc, unsigned int nr)
 854 {
 855         unsigned short *p = (unsigned short *) vc->vc_pos;
 856 
 857         vc_uniscr_delete(vc, nr);
 858         scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
 859         scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
 860                         nr * 2);
 861         vc->vc_need_wrap = 0;
 862         if (con_should_update(vc))
 863                 do_update_region(vc, (unsigned long) p,
 864                         vc->vc_cols - vc->vc_x);
 865 }
 866 
 867 static int softcursor_original = -1;
 868 
 869 static void add_softcursor(struct vc_data *vc)
 870 {
 871         int i = scr_readw((u16 *) vc->vc_pos);
 872         u32 type = vc->vc_cursor_type;
 873 
 874         if (! (type & 0x10)) return;
 875         if (softcursor_original != -1) return;
 876         softcursor_original = i;
 877         i |= ((type >> 8) & 0xff00 );
 878         i ^= ((type) & 0xff00 );
 879         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 880         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 881         scr_writew(i, (u16 *) vc->vc_pos);
 882         if (con_should_update(vc))
 883                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 884 }
 885 
 886 static void hide_softcursor(struct vc_data *vc)
 887 {
 888         if (softcursor_original != -1) {
 889                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 890                 if (con_should_update(vc))
 891                         vc->vc_sw->con_putc(vc, softcursor_original,
 892                                         vc->vc_y, vc->vc_x);
 893                 softcursor_original = -1;
 894         }
 895 }
 896 
 897 static void hide_cursor(struct vc_data *vc)
 898 {
 899         if (vc_is_sel(vc))
 900                 clear_selection();
 901 
 902         vc->vc_sw->con_cursor(vc, CM_ERASE);
 903         hide_softcursor(vc);
 904 }
 905 
 906 static void set_cursor(struct vc_data *vc)
 907 {
 908         if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
 909                 return;
 910         if (vc->vc_deccm) {
 911                 if (vc_is_sel(vc))
 912                         clear_selection();
 913                 add_softcursor(vc);
 914                 if ((vc->vc_cursor_type & 0x0f) != 1)
 915                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 916         } else
 917                 hide_cursor(vc);
 918 }
 919 
 920 static void set_origin(struct vc_data *vc)
 921 {
 922         WARN_CONSOLE_UNLOCKED();
 923 
 924         if (!con_is_visible(vc) ||
 925             !vc->vc_sw->con_set_origin ||
 926             !vc->vc_sw->con_set_origin(vc))
 927                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 928         vc->vc_visible_origin = vc->vc_origin;
 929         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 930         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 931 }
 932 
 933 static void save_screen(struct vc_data *vc)
 934 {
 935         WARN_CONSOLE_UNLOCKED();
 936 
 937         if (vc->vc_sw->con_save_screen)
 938                 vc->vc_sw->con_save_screen(vc);
 939 }
 940 
 941 static void flush_scrollback(struct vc_data *vc)
 942 {
 943         WARN_CONSOLE_UNLOCKED();
 944 
 945         set_origin(vc);
 946         if (vc->vc_sw->con_flush_scrollback) {
 947                 vc->vc_sw->con_flush_scrollback(vc);
 948         } else if (con_is_visible(vc)) {
 949                 /*
 950                  * When no con_flush_scrollback method is provided then the
 951                  * legacy way for flushing the scrollback buffer is to use
 952                  * a side effect of the con_switch method. We do it only on
 953                  * the foreground console as background consoles have no
 954                  * scrollback buffers in that case and we obviously don't
 955                  * want to switch to them.
 956                  */
 957                 hide_cursor(vc);
 958                 vc->vc_sw->con_switch(vc);
 959                 set_cursor(vc);
 960         }
 961 }
 962 
 963 /*
 964  *      Redrawing of screen
 965  */
 966 
 967 void clear_buffer_attributes(struct vc_data *vc)
 968 {
 969         unsigned short *p = (unsigned short *)vc->vc_origin;
 970         int count = vc->vc_screenbuf_size / 2;
 971         int mask = vc->vc_hi_font_mask | 0xff;
 972 
 973         for (; count > 0; count--, p++) {
 974                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 975         }
 976 }
 977 
 978 void redraw_screen(struct vc_data *vc, int is_switch)
 979 {
 980         int redraw = 0;
 981 
 982         WARN_CONSOLE_UNLOCKED();
 983 
 984         if (!vc) {
 985                 /* strange ... */
 986                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 987                 return;
 988         }
 989 
 990         if (is_switch) {
 991                 struct vc_data *old_vc = vc_cons[fg_console].d;
 992                 if (old_vc == vc)
 993                         return;
 994                 if (!con_is_visible(vc))
 995                         redraw = 1;
 996                 *vc->vc_display_fg = vc;
 997                 fg_console = vc->vc_num;
 998                 hide_cursor(old_vc);
 999                 if (!con_is_visible(old_vc)) {
1000                         save_screen(old_vc);
1001                         set_origin(old_vc);
1002                 }
1003                 if (tty0dev)
1004                         sysfs_notify(&tty0dev->kobj, NULL, "active");
1005         } else {
1006                 hide_cursor(vc);
1007                 redraw = 1;
1008         }
1009 
1010         if (redraw) {
1011                 int update;
1012                 int old_was_color = vc->vc_can_do_color;
1013 
1014                 set_origin(vc);
1015                 update = vc->vc_sw->con_switch(vc);
1016                 set_palette(vc);
1017                 /*
1018                  * If console changed from mono<->color, the best we can do
1019                  * is to clear the buffer attributes. As it currently stands,
1020                  * rebuilding new attributes from the old buffer is not doable
1021                  * without overly complex code.
1022                  */
1023                 if (old_was_color != vc->vc_can_do_color) {
1024                         update_attr(vc);
1025                         clear_buffer_attributes(vc);
1026                 }
1027 
1028                 if (update && vc->vc_mode != KD_GRAPHICS)
1029                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
1030         }
1031         set_cursor(vc);
1032         if (is_switch) {
1033                 set_leds();
1034                 compute_shiftstate();
1035                 notify_update(vc);
1036         }
1037 }
1038 
1039 /*
1040  *      Allocation, freeing and resizing of VTs.
1041  */
1042 
1043 int vc_cons_allocated(unsigned int i)
1044 {
1045         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
1046 }
1047 
1048 static void visual_init(struct vc_data *vc, int num, int init)
1049 {
1050         /* ++Geert: vc->vc_sw->con_init determines console size */
1051         if (vc->vc_sw)
1052                 module_put(vc->vc_sw->owner);
1053         vc->vc_sw = conswitchp;
1054 #ifndef VT_SINGLE_DRIVER
1055         if (con_driver_map[num])
1056                 vc->vc_sw = con_driver_map[num];
1057 #endif
1058         __module_get(vc->vc_sw->owner);
1059         vc->vc_num = num;
1060         vc->vc_display_fg = &master_display_fg;
1061         if (vc->vc_uni_pagedir_loc)
1062                 con_free_unimap(vc);
1063         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
1064         vc->vc_uni_pagedir = NULL;
1065         vc->vc_hi_font_mask = 0;
1066         vc->vc_complement_mask = 0;
1067         vc->vc_can_do_color = 0;
1068         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1069         vc->vc_sw->con_init(vc, init);
1070         if (!vc->vc_complement_mask)
1071                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
1072         vc->vc_s_complement_mask = vc->vc_complement_mask;
1073         vc->vc_size_row = vc->vc_cols << 1;
1074         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
1075 }
1076 
1077 
1078 static void visual_deinit(struct vc_data *vc)
1079 {
1080         vc->vc_sw->con_deinit(vc);
1081         module_put(vc->vc_sw->owner);
1082 }
1083 
1084 static void vc_port_destruct(struct tty_port *port)
1085 {
1086         struct vc_data *vc = container_of(port, struct vc_data, port);
1087 
1088         kfree(vc);
1089 }
1090 
1091 static const struct tty_port_operations vc_port_ops = {
1092         .destruct = vc_port_destruct,
1093 };
1094 
1095 int vc_allocate(unsigned int currcons)  /* return 0 on success */
1096 {
1097         struct vt_notifier_param param;
1098         struct vc_data *vc;
1099 
1100         WARN_CONSOLE_UNLOCKED();
1101 
1102         if (currcons >= MAX_NR_CONSOLES)
1103                 return -ENXIO;
1104 
1105         if (vc_cons[currcons].d)
1106                 return 0;
1107 
1108         /* due to the granularity of kmalloc, we waste some memory here */
1109         /* the alloc is done in two steps, to optimize the common situation
1110            of a 25x80 console (structsize=216, screenbuf_size=4000) */
1111         /* although the numbers above are not valid since long ago, the
1112            point is still up-to-date and the comment still has its value
1113            even if only as a historical artifact.  --mj, July 1998 */
1114         param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
1115         if (!vc)
1116                 return -ENOMEM;
1117 
1118         vc_cons[currcons].d = vc;
1119         tty_port_init(&vc->port);
1120         vc->port.ops = &vc_port_ops;
1121         INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
1122 
1123         visual_init(vc, currcons, 1);
1124 
1125         if (!*vc->vc_uni_pagedir_loc)
1126                 con_set_default_unimap(vc);
1127 
1128         vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
1129         if (!vc->vc_screenbuf)
1130                 goto err_free;
1131 
1132         /* If no drivers have overridden us and the user didn't pass a
1133            boot option, default to displaying the cursor */
1134         if (global_cursor_default == -1)
1135                 global_cursor_default = 1;
1136 
1137         vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
1138         vcs_make_sysfs(currcons);
1139         atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
1140 
1141         return 0;
1142 err_free:
1143         visual_deinit(vc);
1144         kfree(vc);
1145         vc_cons[currcons].d = NULL;
1146         return -ENOMEM;
1147 }
1148 
1149 static inline int resize_screen(struct vc_data *vc, int width, int height,
1150                                 int user)
1151 {
1152         /* Resizes the resolution of the display adapater */
1153         int err = 0;
1154 
1155         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
1156                 err = vc->vc_sw->con_resize(vc, width, height, user);
1157 
1158         return err;
1159 }
1160 
1161 /*
1162  * Change # of rows and columns (0 means unchanged/the size of fg_console)
1163  * [this is to be used together with some user program
1164  * like resize that changes the hardware videomode]
1165  */
1166 #define VC_RESIZE_MAXCOL (32767)
1167 #define VC_RESIZE_MAXROW (32767)
1168 
1169 /**
1170  *      vc_do_resize    -       resizing method for the tty
1171  *      @tty: tty being resized
1172  *      @real_tty: real tty (different to tty if a pty/tty pair)
1173  *      @vc: virtual console private data
1174  *      @cols: columns
1175  *      @lines: lines
1176  *
1177  *      Resize a virtual console, clipping according to the actual constraints.
1178  *      If the caller passes a tty structure then update the termios winsize
1179  *      information and perform any necessary signal handling.
1180  *
1181  *      Caller must hold the console semaphore. Takes the termios rwsem and
1182  *      ctrl_lock of the tty IFF a tty is passed.
1183  */
1184 
1185 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
1186                                 unsigned int cols, unsigned int lines)
1187 {
1188         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
1189         unsigned long end;
1190         unsigned int old_rows, old_row_size, first_copied_row;
1191         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
1192         unsigned int user;
1193         unsigned short *newscreen;
1194         struct uni_screen *new_uniscr = NULL;
1195 
1196         WARN_CONSOLE_UNLOCKED();
1197 
1198         if (!vc)
1199                 return -ENXIO;
1200 
1201         user = vc->vc_resize_user;
1202         vc->vc_resize_user = 0;
1203 
1204         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
1205                 return -EINVAL;
1206 
1207         new_cols = (cols ? cols : vc->vc_cols);
1208         new_rows = (lines ? lines : vc->vc_rows);
1209         new_row_size = new_cols << 1;
1210         new_screen_size = new_row_size * new_rows;
1211 
1212         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
1213                 return 0;
1214 
1215         if (new_screen_size > KMALLOC_MAX_SIZE)
1216                 return -EINVAL;
1217         newscreen = kzalloc(new_screen_size, GFP_USER);
1218         if (!newscreen)
1219                 return -ENOMEM;
1220 
1221         if (get_vc_uniscr(vc)) {
1222                 new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
1223                 if (!new_uniscr) {
1224                         kfree(newscreen);
1225                         return -ENOMEM;
1226                 }
1227         }
1228 
1229         if (vc_is_sel(vc))
1230                 clear_selection();
1231 
1232         old_rows = vc->vc_rows;
1233         old_row_size = vc->vc_size_row;
1234 
1235         err = resize_screen(vc, new_cols, new_rows, user);
1236         if (err) {
1237                 kfree(newscreen);
1238                 vc_uniscr_free(new_uniscr);
1239                 return err;
1240         }
1241 
1242         vc->vc_rows = new_rows;
1243         vc->vc_cols = new_cols;
1244         vc->vc_size_row = new_row_size;
1245         vc->vc_screenbuf_size = new_screen_size;
1246 
1247         rlth = min(old_row_size, new_row_size);
1248         rrem = new_row_size - rlth;
1249         old_origin = vc->vc_origin;
1250         new_origin = (long) newscreen;
1251         new_scr_end = new_origin + new_screen_size;
1252 
1253         if (vc->vc_y > new_rows) {
1254                 if (old_rows - vc->vc_y < new_rows) {
1255                         /*
1256                          * Cursor near the bottom, copy contents from the
1257                          * bottom of buffer
1258                          */
1259                         first_copied_row = (old_rows - new_rows);
1260                 } else {
1261                         /*
1262                          * Cursor is in no man's land, copy 1/2 screenful
1263                          * from the top and bottom of cursor position
1264                          */
1265                         first_copied_row = (vc->vc_y - new_rows/2);
1266                 }
1267                 old_origin += first_copied_row * old_row_size;
1268         } else
1269                 first_copied_row = 0;
1270         end = old_origin + old_row_size * min(old_rows, new_rows);
1271 
1272         vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
1273                             get_vc_uniscr(vc), rlth/2, first_copied_row,
1274                             min(old_rows, new_rows));
1275         vc_uniscr_set(vc, new_uniscr);
1276 
1277         update_attr(vc);
1278 
1279         while (old_origin < end) {
1280                 scr_memcpyw((unsigned short *) new_origin,
1281                             (unsigned short *) old_origin, rlth);
1282                 if (rrem)
1283                         scr_memsetw((void *)(new_origin + rlth),
1284                                     vc->vc_video_erase_char, rrem);
1285                 old_origin += old_row_size;
1286                 new_origin += new_row_size;
1287         }
1288         if (new_scr_end > new_origin)
1289                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
1290                             new_scr_end - new_origin);
1291         kfree(vc->vc_screenbuf);
1292         vc->vc_screenbuf = newscreen;
1293         vc->vc_screenbuf_size = new_screen_size;
1294         set_origin(vc);
1295 
1296         /* do part of a reset_terminal() */
1297         vc->vc_top = 0;
1298         vc->vc_bottom = vc->vc_rows;
1299         gotoxy(vc, vc->vc_x, vc->vc_y);
1300         save_cur(vc);
1301 
1302         if (tty) {
1303                 /* Rewrite the requested winsize data with the actual
1304                    resulting sizes */
1305                 struct winsize ws;
1306                 memset(&ws, 0, sizeof(ws));
1307                 ws.ws_row = vc->vc_rows;
1308                 ws.ws_col = vc->vc_cols;
1309                 ws.ws_ypixel = vc->vc_scan_lines;
1310                 tty_do_resize(tty, &ws);
1311         }
1312 
1313         if (con_is_visible(vc))
1314                 update_screen(vc);
1315         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
1316         notify_update(vc);
1317         return err;
1318 }
1319 
1320 /**
1321  *      vc_resize               -       resize a VT
1322  *      @vc: virtual console
1323  *      @cols: columns
1324  *      @rows: rows
1325  *
1326  *      Resize a virtual console as seen from the console end of things. We
1327  *      use the common vc_do_resize methods to update the structures. The
1328  *      caller must hold the console sem to protect console internals and
1329  *      vc->port.tty
1330  */
1331 
1332 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
1333 {
1334         return vc_do_resize(vc->port.tty, vc, cols, rows);
1335 }
1336 
1337 /**
1338  *      vt_resize               -       resize a VT
1339  *      @tty: tty to resize
1340  *      @ws: winsize attributes
1341  *
1342  *      Resize a virtual terminal. This is called by the tty layer as we
1343  *      register our own handler for resizing. The mutual helper does all
1344  *      the actual work.
1345  *
1346  *      Takes the console sem and the called methods then take the tty
1347  *      termios_rwsem and the tty ctrl_lock in that order.
1348  */
1349 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
1350 {
1351         struct vc_data *vc = tty->driver_data;
1352         int ret;
1353 
1354         console_lock();
1355         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
1356         console_unlock();
1357         return ret;
1358 }
1359 
1360 struct vc_data *vc_deallocate(unsigned int currcons)
1361 {
1362         struct vc_data *vc = NULL;
1363 
1364         WARN_CONSOLE_UNLOCKED();
1365 
1366         if (vc_cons_allocated(currcons)) {
1367                 struct vt_notifier_param param;
1368 
1369                 param.vc = vc = vc_cons[currcons].d;
1370                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
1371                 vcs_remove_sysfs(currcons);
1372                 visual_deinit(vc);
1373                 put_pid(vc->vt_pid);
1374                 vc_uniscr_set(vc, NULL);
1375                 kfree(vc->vc_screenbuf);
1376                 vc_cons[currcons].d = NULL;
1377         }
1378         return vc;
1379 }
1380 
1381 /*
1382  *      VT102 emulator
1383  */
1384 
1385 enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
1386 
1387 #define set_kbd(vc, x)  vt_set_kbd_mode_bit((vc)->vc_num, (x))
1388 #define clr_kbd(vc, x)  vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1389 #define is_kbd(vc, x)   vt_get_kbd_mode_bit((vc)->vc_num, (x))
1390 
1391 #define decarm          VC_REPEAT
1392 #define decckm          VC_CKMODE
1393 #define kbdapplic       VC_APPLIC
1394 #define lnm             VC_CRLF
1395 
1396 /*
1397  * this is what the terminal answers to a ESC-Z or csi0c query.
1398  */
1399 #define VT100ID "\033[?1;2c"
1400 #define VT102ID "\033[?6c"
1401 
1402 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1403                                        8,12,10,14, 9,13,11,15 };
1404 
1405 /* the default colour table, for VGA+ colour systems */
1406 unsigned char default_red[] = {
1407         0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
1408         0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
1409 };
1410 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
1411 
1412 unsigned char default_grn[] = {
1413         0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
1414         0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
1415 };
1416 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
1417 
1418 unsigned char default_blu[] = {
1419         0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
1420         0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
1421 };
1422 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
1423 
1424 /*
1425  * gotoxy() must verify all boundaries, because the arguments
1426  * might also be negative. If the given position is out of
1427  * bounds, the cursor is placed at the nearest margin.
1428  */
1429 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1430 {
1431         int min_y, max_y;
1432 
1433         if (new_x < 0)
1434                 vc->vc_x = 0;
1435         else {
1436                 if (new_x >= vc->vc_cols)
1437                         vc->vc_x = vc->vc_cols - 1;
1438                 else
1439                         vc->vc_x = new_x;
1440         }
1441 
1442         if (vc->vc_decom) {
1443                 min_y = vc->vc_top;
1444                 max_y = vc->vc_bottom;
1445         } else {
1446                 min_y = 0;
1447                 max_y = vc->vc_rows;
1448         }
1449         if (new_y < min_y)
1450                 vc->vc_y = min_y;
1451         else if (new_y >= max_y)
1452                 vc->vc_y = max_y - 1;
1453         else
1454                 vc->vc_y = new_y;
1455         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1456         vc->vc_need_wrap = 0;
1457 }
1458 
1459 /* for absolute user moves, when decom is set */
1460 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1461 {
1462         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1463 }
1464 
1465 void scrollback(struct vc_data *vc)
1466 {
1467         scrolldelta(-(vc->vc_rows / 2));
1468 }
1469 
1470 void scrollfront(struct vc_data *vc, int lines)
1471 {
1472         if (!lines)
1473                 lines = vc->vc_rows / 2;
1474         scrolldelta(lines);
1475 }
1476 
1477 static void lf(struct vc_data *vc)
1478 {
1479         /* don't scroll if above bottom of scrolling region, or
1480          * if below scrolling region
1481          */
1482         if (vc->vc_y + 1 == vc->vc_bottom)
1483                 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
1484         else if (vc->vc_y < vc->vc_rows - 1) {
1485                 vc->vc_y++;
1486                 vc->vc_pos += vc->vc_size_row;
1487         }
1488         vc->vc_need_wrap = 0;
1489         notify_write(vc, '\n');
1490 }
1491 
1492 static void ri(struct vc_data *vc)
1493 {
1494         /* don't scroll if below top of scrolling region, or
1495          * if above scrolling region
1496          */
1497         if (vc->vc_y == vc->vc_top)
1498                 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
1499         else if (vc->vc_y > 0) {
1500                 vc->vc_y--;
1501                 vc->vc_pos -= vc->vc_size_row;
1502         }
1503         vc->vc_need_wrap = 0;
1504 }
1505 
1506 static inline void cr(struct vc_data *vc)
1507 {
1508         vc->vc_pos -= vc->vc_x << 1;
1509         vc->vc_need_wrap = vc->vc_x = 0;
1510         notify_write(vc, '\r');
1511 }
1512 
1513 static inline void bs(struct vc_data *vc)
1514 {
1515         if (vc->vc_x) {
1516                 vc->vc_pos -= 2;
1517                 vc->vc_x--;
1518                 vc->vc_need_wrap = 0;
1519                 notify_write(vc, '\b');
1520         }
1521 }
1522 
1523 static inline void del(struct vc_data *vc)
1524 {
1525         /* ignored */
1526 }
1527 
1528 static void csi_J(struct vc_data *vc, int vpar)
1529 {
1530         unsigned int count;
1531         unsigned short * start;
1532 
1533         switch (vpar) {
1534                 case 0: /* erase from cursor to end of display */
1535                         vc_uniscr_clear_line(vc, vc->vc_x,
1536                                              vc->vc_cols - vc->vc_x);
1537                         vc_uniscr_clear_lines(vc, vc->vc_y + 1,
1538                                               vc->vc_rows - vc->vc_y - 1);
1539                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1540                         start = (unsigned short *)vc->vc_pos;
1541                         break;
1542                 case 1: /* erase from start to cursor */
1543                         vc_uniscr_clear_line(vc, 0, vc->vc_x + 1);
1544                         vc_uniscr_clear_lines(vc, 0, vc->vc_y);
1545                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1546                         start = (unsigned short *)vc->vc_origin;
1547                         break;
1548                 case 3: /* include scrollback */
1549                         flush_scrollback(vc);
1550                         /* fallthrough */
1551                 case 2: /* erase whole display */
1552                         vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
1553                         count = vc->vc_cols * vc->vc_rows;
1554                         start = (unsigned short *)vc->vc_origin;
1555                         break;
1556                 default:
1557                         return;
1558         }
1559         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1560         if (con_should_update(vc))
1561                 do_update_region(vc, (unsigned long) start, count);
1562         vc->vc_need_wrap = 0;
1563 }
1564 
1565 static void csi_K(struct vc_data *vc, int vpar)
1566 {
1567         unsigned int count;
1568         unsigned short *start = (unsigned short *)vc->vc_pos;
1569         int offset;
1570 
1571         switch (vpar) {
1572                 case 0: /* erase from cursor to end of line */
1573                         offset = 0;
1574                         count = vc->vc_cols - vc->vc_x;
1575                         break;
1576                 case 1: /* erase from start of line to cursor */
1577                         offset = -vc->vc_x;
1578                         count = vc->vc_x + 1;
1579                         break;
1580                 case 2: /* erase whole line */
1581                         offset = -vc->vc_x;
1582                         count = vc->vc_cols;
1583                         break;
1584                 default:
1585                         return;
1586         }
1587         vc_uniscr_clear_line(vc, vc->vc_x + offset, count);
1588         scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
1589         vc->vc_need_wrap = 0;
1590         if (con_should_update(vc))
1591                 do_update_region(vc, (unsigned long)(start + offset), count);
1592 }
1593 
1594 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1595 {                                         /* not vt100? */
1596         int count;
1597 
1598         if (!vpar)
1599                 vpar++;
1600         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1601 
1602         vc_uniscr_clear_line(vc, vc->vc_x, count);
1603         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1604         if (con_should_update(vc))
1605                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1606         vc->vc_need_wrap = 0;
1607 }
1608 
1609 static void default_attr(struct vc_data *vc)
1610 {
1611         vc->vc_intensity = 1;
1612         vc->vc_italic = 0;
1613         vc->vc_underline = 0;
1614         vc->vc_reverse = 0;
1615         vc->vc_blink = 0;
1616         vc->vc_color = vc->vc_def_color;
1617 }
1618 
1619 struct rgb { u8 r; u8 g; u8 b; };
1620 
1621 static void rgb_from_256(int i, struct rgb *c)
1622 {
1623         if (i < 8) {            /* Standard colours. */
1624                 c->r = i&1 ? 0xaa : 0x00;
1625                 c->g = i&2 ? 0xaa : 0x00;
1626                 c->b = i&4 ? 0xaa : 0x00;
1627         } else if (i < 16) {
1628                 c->r = i&1 ? 0xff : 0x55;
1629                 c->g = i&2 ? 0xff : 0x55;
1630                 c->b = i&4 ? 0xff : 0x55;
1631         } else if (i < 232) {   /* 6x6x6 colour cube. */
1632                 c->r = (i - 16) / 36 * 85 / 2;
1633                 c->g = (i - 16) / 6 % 6 * 85 / 2;
1634                 c->b = (i - 16) % 6 * 85 / 2;
1635         } else                  /* Grayscale ramp. */
1636                 c->r = c->g = c->b = i * 10 - 2312;
1637 }
1638 
1639 static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
1640 {
1641         u8 hue = 0, max = max3(c->r, c->g, c->b);
1642 
1643         if (c->r > max / 2)
1644                 hue |= 4;
1645         if (c->g > max / 2)
1646                 hue |= 2;
1647         if (c->b > max / 2)
1648                 hue |= 1;
1649 
1650         if (hue == 7 && max <= 0x55) {
1651                 hue = 0;
1652                 vc->vc_intensity = 2;
1653         } else if (max > 0xaa)
1654                 vc->vc_intensity = 2;
1655         else
1656                 vc->vc_intensity = 1;
1657 
1658         vc->vc_color = (vc->vc_color & 0xf0) | hue;
1659 }
1660 
1661 static void rgb_background(struct vc_data *vc, const struct rgb *c)
1662 {
1663         /* For backgrounds, err on the dark side. */
1664         vc->vc_color = (vc->vc_color & 0x0f)
1665                 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
1666 }
1667 
1668 /*
1669  * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
1670  * and thus need to be detected and ignored by hand. That standard also
1671  * wants : rather than ; as separators but sequences containing : are currently
1672  * completely ignored by the parser.
1673  *
1674  * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
1675  * supporting them.
1676  */
1677 static int vc_t416_color(struct vc_data *vc, int i,
1678                 void(*set_color)(struct vc_data *vc, const struct rgb *c))
1679 {
1680         struct rgb c;
1681 
1682         i++;
1683         if (i > vc->vc_npar)
1684                 return i;
1685 
1686         if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
1687                 /* 256 colours */
1688                 i++;
1689                 rgb_from_256(vc->vc_par[i], &c);
1690         } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
1691                 /* 24 bit */
1692                 c.r = vc->vc_par[i + 1];
1693                 c.g = vc->vc_par[i + 2];
1694                 c.b = vc->vc_par[i + 3];
1695                 i += 3;
1696         } else
1697                 return i;
1698 
1699         set_color(vc, &c);
1700 
1701         return i;
1702 }
1703 
1704 /* console_lock is held */
1705 static void csi_m(struct vc_data *vc)
1706 {
1707         int i;
1708 
1709         for (i = 0; i <= vc->vc_npar; i++)
1710                 switch (vc->vc_par[i]) {
1711                 case 0: /* all attributes off */
1712                         default_attr(vc);
1713                         break;
1714                 case 1:
1715                         vc->vc_intensity = 2;
1716                         break;
1717                 case 2:
1718                         vc->vc_intensity = 0;
1719                         break;
1720                 case 3:
1721                         vc->vc_italic = 1;
1722                         break;
1723                 case 21:
1724                         /*
1725                          * No console drivers support double underline, so
1726                          * convert it to a single underline.
1727                          */
1728                 case 4:
1729                         vc->vc_underline = 1;
1730                         break;
1731                 case 5:
1732                         vc->vc_blink = 1;
1733                         break;
1734                 case 7:
1735                         vc->vc_reverse = 1;
1736                         break;
1737                 case 10: /* ANSI X3.64-1979 (SCO-ish?)
1738                           * Select primary font, don't display control chars if
1739                           * defined, don't set bit 8 on output.
1740                           */
1741                         vc->vc_translate = set_translate(vc->vc_charset == 0
1742                                         ? vc->vc_G0_charset
1743                                         : vc->vc_G1_charset, vc);
1744                         vc->vc_disp_ctrl = 0;
1745                         vc->vc_toggle_meta = 0;
1746                         break;
1747                 case 11: /* ANSI X3.64-1979 (SCO-ish?)
1748                           * Select first alternate font, lets chars < 32 be
1749                           * displayed as ROM chars.
1750                           */
1751                         vc->vc_translate = set_translate(IBMPC_MAP, vc);
1752                         vc->vc_disp_ctrl = 1;
1753                         vc->vc_toggle_meta = 0;
1754                         break;
1755                 case 12: /* ANSI X3.64-1979 (SCO-ish?)
1756                           * Select second alternate font, toggle high bit
1757                           * before displaying as ROM char.
1758                           */
1759                         vc->vc_translate = set_translate(IBMPC_MAP, vc);
1760                         vc->vc_disp_ctrl = 1;
1761                         vc->vc_toggle_meta = 1;
1762                         break;
1763                 case 22:
1764                         vc->vc_intensity = 1;
1765                         break;
1766                 case 23:
1767                         vc->vc_italic = 0;
1768                         break;
1769                 case 24:
1770                         vc->vc_underline = 0;
1771                         break;
1772                 case 25:
1773                         vc->vc_blink = 0;
1774                         break;
1775                 case 27:
1776                         vc->vc_reverse = 0;
1777                         break;
1778                 case 38:
1779                         i = vc_t416_color(vc, i, rgb_foreground);
1780                         break;
1781                 case 48:
1782                         i = vc_t416_color(vc, i, rgb_background);
1783                         break;
1784                 case 39:
1785                         vc->vc_color = (vc->vc_def_color & 0x0f) |
1786                                 (vc->vc_color & 0xf0);
1787                         break;
1788                 case 49:
1789                         vc->vc_color = (vc->vc_def_color & 0xf0) |
1790                                 (vc->vc_color & 0x0f);
1791                         break;
1792                 default:
1793                         if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
1794                                 if (vc->vc_par[i] < 100)
1795                                         vc->vc_intensity = 2;
1796                                 vc->vc_par[i] -= 60;
1797                         }
1798                         if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1799                                 vc->vc_color = color_table[vc->vc_par[i] - 30]
1800                                         | (vc->vc_color & 0xf0);
1801                         else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1802                                 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1803                                         | (vc->vc_color & 0x0f);
1804                         break;
1805                 }
1806         update_attr(vc);
1807 }
1808 
1809 static void respond_string(const char *p, struct tty_port *port)
1810 {
1811         while (*p) {
1812                 tty_insert_flip_char(port, *p, 0);
1813                 p++;
1814         }
1815         tty_schedule_flip(port);
1816 }
1817 
1818 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1819 {
1820         char buf[40];
1821 
1822         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1823         respond_string(buf, tty->port);
1824 }
1825 
1826 static inline void status_report(struct tty_struct *tty)
1827 {
1828         respond_string("\033[0n", tty->port);   /* Terminal ok */
1829 }
1830 
1831 static inline void respond_ID(struct tty_struct *tty)
1832 {
1833         respond_string(VT102ID, tty->port);
1834 }
1835 
1836 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1837 {
1838         char buf[8];
1839 
1840         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1841                 (char)('!' + mry));
1842         respond_string(buf, tty->port);
1843 }
1844 
1845 /* invoked via ioctl(TIOCLINUX) and through set_selection_user */
1846 int mouse_reporting(void)
1847 {
1848         return vc_cons[fg_console].d->vc_report_mouse;
1849 }
1850 
1851 /* console_lock is held */
1852 static void set_mode(struct vc_data *vc, int on_off)
1853 {
1854         int i;
1855 
1856         for (i = 0; i <= vc->vc_npar; i++)
1857                 if (vc->vc_priv == EPdec) {
1858                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1859                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1860                                 if (on_off)
1861                                         set_kbd(vc, decckm);
1862                                 else
1863                                         clr_kbd(vc, decckm);
1864                                 break;
1865                         case 3: /* 80/132 mode switch unimplemented */
1866 #if 0
1867                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1868                                 /* this alone does not suffice; some user mode
1869                                    utility has to change the hardware regs */
1870 #endif
1871                                 break;
1872                         case 5:                 /* Inverted screen on/off */
1873                                 if (vc->vc_decscnm != on_off) {
1874                                         vc->vc_decscnm = on_off;
1875                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1876                                         update_attr(vc);
1877                                 }
1878                                 break;
1879                         case 6:                 /* Origin relative/absolute */
1880                                 vc->vc_decom = on_off;
1881                                 gotoxay(vc, 0, 0);
1882                                 break;
1883                         case 7:                 /* Autowrap on/off */
1884                                 vc->vc_decawm = on_off;
1885                                 break;
1886                         case 8:                 /* Autorepeat on/off */
1887                                 if (on_off)
1888                                         set_kbd(vc, decarm);
1889                                 else
1890                                         clr_kbd(vc, decarm);
1891                                 break;
1892                         case 9:
1893                                 vc->vc_report_mouse = on_off ? 1 : 0;
1894                                 break;
1895                         case 25:                /* Cursor on/off */
1896                                 vc->vc_deccm = on_off;
1897                                 break;
1898                         case 1000:
1899                                 vc->vc_report_mouse = on_off ? 2 : 0;
1900                                 break;
1901                         }
1902                 } else {
1903                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1904                         case 3:                 /* Monitor (display ctrls) */
1905                                 vc->vc_disp_ctrl = on_off;
1906                                 break;
1907                         case 4:                 /* Insert Mode on/off */
1908                                 vc->vc_decim = on_off;
1909                                 break;
1910                         case 20:                /* Lf, Enter == CrLf/Lf */
1911                                 if (on_off)
1912                                         set_kbd(vc, lnm);
1913                                 else
1914                                         clr_kbd(vc, lnm);
1915                                 break;
1916                         }
1917                 }
1918 }
1919 
1920 /* console_lock is held */
1921 static void setterm_command(struct vc_data *vc)
1922 {
1923         switch(vc->vc_par[0]) {
1924                 case 1: /* set color for underline mode */
1925                         if (vc->vc_can_do_color &&
1926                                         vc->vc_par[1] < 16) {
1927                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1928                                 if (vc->vc_underline)
1929                                         update_attr(vc);
1930                         }
1931                         break;
1932                 case 2: /* set color for half intensity mode */
1933                         if (vc->vc_can_do_color &&
1934                                         vc->vc_par[1] < 16) {
1935                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1936                                 if (vc->vc_intensity == 0)
1937                                         update_attr(vc);
1938                         }
1939                         break;
1940                 case 8: /* store colors as defaults */
1941                         vc->vc_def_color = vc->vc_attr;
1942                         if (vc->vc_hi_font_mask == 0x100)
1943                                 vc->vc_def_color >>= 1;
1944                         default_attr(vc);
1945                         update_attr(vc);
1946                         break;
1947                 case 9: /* set blanking interval */
1948                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1949                         poke_blanked_console();
1950                         break;
1951                 case 10: /* set bell frequency in Hz */
1952                         if (vc->vc_npar >= 1)
1953                                 vc->vc_bell_pitch = vc->vc_par[1];
1954                         else
1955                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1956                         break;
1957                 case 11: /* set bell duration in msec */
1958                         if (vc->vc_npar >= 1)
1959                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1960                                         msecs_to_jiffies(vc->vc_par[1]) : 0;
1961                         else
1962                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1963                         break;
1964                 case 12: /* bring specified console to the front */
1965                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1966                                 set_console(vc->vc_par[1] - 1);
1967                         break;
1968                 case 13: /* unblank the screen */
1969                         poke_blanked_console();
1970                         break;
1971                 case 14: /* set vesa powerdown interval */
1972                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1973                         break;
1974                 case 15: /* activate the previous console */
1975                         set_console(last_console);
1976                         break;
1977                 case 16: /* set cursor blink duration in msec */
1978                         if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
1979                                         vc->vc_par[1] <= USHRT_MAX)
1980                                 vc->vc_cur_blink_ms = vc->vc_par[1];
1981                         else
1982                                 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
1983                         break;
1984         }
1985 }
1986 
1987 /* console_lock is held */
1988 static void csi_at(struct vc_data *vc, unsigned int nr)
1989 {
1990         if (nr > vc->vc_cols - vc->vc_x)
1991                 nr = vc->vc_cols - vc->vc_x;
1992         else if (!nr)
1993                 nr = 1;
1994         insert_char(vc, nr);
1995 }
1996 
1997 /* console_lock is held */
1998 static void csi_L(struct vc_data *vc, unsigned int nr)
1999 {
2000         if (nr > vc->vc_rows - vc->vc_y)
2001                 nr = vc->vc_rows - vc->vc_y;
2002         else if (!nr)
2003                 nr = 1;
2004         con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr);
2005         vc->vc_need_wrap = 0;
2006 }
2007 
2008 /* console_lock is held */
2009 static void csi_P(struct vc_data *vc, unsigned int nr)
2010 {
2011         if (nr > vc->vc_cols - vc->vc_x)
2012                 nr = vc->vc_cols - vc->vc_x;
2013         else if (!nr)
2014                 nr = 1;
2015         delete_char(vc, nr);
2016 }
2017 
2018 /* console_lock is held */
2019 static void csi_M(struct vc_data *vc, unsigned int nr)
2020 {
2021         if (nr > vc->vc_rows - vc->vc_y)
2022                 nr = vc->vc_rows - vc->vc_y;
2023         else if (!nr)
2024                 nr=1;
2025         con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_UP, nr);
2026         vc->vc_need_wrap = 0;
2027 }
2028 
2029 /* console_lock is held (except via vc_init->reset_terminal */
2030 static void save_cur(struct vc_data *vc)
2031 {
2032         vc->vc_saved_x          = vc->vc_x;
2033         vc->vc_saved_y          = vc->vc_y;
2034         vc->vc_s_intensity      = vc->vc_intensity;
2035         vc->vc_s_italic         = vc->vc_italic;
2036         vc->vc_s_underline      = vc->vc_underline;
2037         vc->vc_s_blink          = vc->vc_blink;
2038         vc->vc_s_reverse        = vc->vc_reverse;
2039         vc->vc_s_charset        = vc->vc_charset;
2040         vc->vc_s_color          = vc->vc_color;
2041         vc->vc_saved_G0         = vc->vc_G0_charset;
2042         vc->vc_saved_G1         = vc->vc_G1_charset;
2043 }
2044 
2045 /* console_lock is held */
2046 static void restore_cur(struct vc_data *vc)
2047 {
2048         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
2049         vc->vc_intensity        = vc->vc_s_intensity;
2050         vc->vc_italic           = vc->vc_s_italic;
2051         vc->vc_underline        = vc->vc_s_underline;
2052         vc->vc_blink            = vc->vc_s_blink;
2053         vc->vc_reverse          = vc->vc_s_reverse;
2054         vc->vc_charset          = vc->vc_s_charset;
2055         vc->vc_color            = vc->vc_s_color;
2056         vc->vc_G0_charset       = vc->vc_saved_G0;
2057         vc->vc_G1_charset       = vc->vc_saved_G1;
2058         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
2059         update_attr(vc);
2060         vc->vc_need_wrap = 0;
2061 }
2062 
2063 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
2064         EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd,
2065         ESpalette, ESosc };
2066 
2067 /* console_lock is held (except via vc_init()) */
2068 static void reset_terminal(struct vc_data *vc, int do_clear)
2069 {
2070         vc->vc_top              = 0;
2071         vc->vc_bottom           = vc->vc_rows;
2072         vc->vc_state            = ESnormal;
2073         vc->vc_priv             = EPecma;
2074         vc->vc_translate        = set_translate(LAT1_MAP, vc);
2075         vc->vc_G0_charset       = LAT1_MAP;
2076         vc->vc_G1_charset       = GRAF_MAP;
2077         vc->vc_charset          = 0;
2078         vc->vc_need_wrap        = 0;
2079         vc->vc_report_mouse     = 0;
2080         vc->vc_utf              = default_utf8;
2081         vc->vc_utf_count        = 0;
2082 
2083         vc->vc_disp_ctrl        = 0;
2084         vc->vc_toggle_meta      = 0;
2085 
2086         vc->vc_decscnm          = 0;
2087         vc->vc_decom            = 0;
2088         vc->vc_decawm           = 1;
2089         vc->vc_deccm            = global_cursor_default;
2090         vc->vc_decim            = 0;
2091 
2092         vt_reset_keyboard(vc->vc_num);
2093 
2094         vc->vc_cursor_type = cur_default;
2095         vc->vc_complement_mask = vc->vc_s_complement_mask;
2096 
2097         default_attr(vc);
2098         update_attr(vc);
2099 
2100         vc->vc_tab_stop[0]      =
2101         vc->vc_tab_stop[1]      =
2102         vc->vc_tab_stop[2]      =
2103         vc->vc_tab_stop[3]      =
2104         vc->vc_tab_stop[4]      =
2105         vc->vc_tab_stop[5]      =
2106         vc->vc_tab_stop[6]      =
2107         vc->vc_tab_stop[7]      = 0x01010101;
2108 
2109         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
2110         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
2111         vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
2112 
2113         gotoxy(vc, 0, 0);
2114         save_cur(vc);
2115         if (do_clear)
2116             csi_J(vc, 2);
2117 }
2118 
2119 /* console_lock is held */
2120 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
2121 {
2122         /*
2123          *  Control characters can be used in the _middle_
2124          *  of an escape sequence.
2125          */
2126         if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
2127                 return;
2128         switch (c) {
2129         case 0:
2130                 return;
2131         case 7:
2132                 if (vc->vc_state == ESosc)
2133                         vc->vc_state = ESnormal;
2134                 else if (vc->vc_bell_duration)
2135                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
2136                 return;
2137         case 8:
2138                 bs(vc);
2139                 return;
2140         case 9:
2141                 vc->vc_pos -= (vc->vc_x << 1);
2142                 while (vc->vc_x < vc->vc_cols - 1) {
2143                         vc->vc_x++;
2144                         if (vc->vc_tab_stop[7 & (vc->vc_x >> 5)] & (1 << (vc->vc_x & 31)))
2145                                 break;
2146                 }
2147                 vc->vc_pos += (vc->vc_x << 1);
2148                 notify_write(vc, '\t');
2149                 return;
2150         case 10: case 11: case 12:
2151                 lf(vc);
2152                 if (!is_kbd(vc, lnm))
2153                         return;
2154                 /* fall through */
2155         case 13:
2156                 cr(vc);
2157                 return;
2158         case 14:
2159                 vc->vc_charset = 1;
2160                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2161                 vc->vc_disp_ctrl = 1;
2162                 return;
2163         case 15:
2164                 vc->vc_charset = 0;
2165                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2166                 vc->vc_disp_ctrl = 0;
2167                 return;
2168         case 24: case 26:
2169                 vc->vc_state = ESnormal;
2170                 return;
2171         case 27:
2172                 vc->vc_state = ESesc;
2173                 return;
2174         case 127:
2175                 del(vc);
2176                 return;
2177         case 128+27:
2178                 vc->vc_state = ESsquare;
2179                 return;
2180         }
2181         switch(vc->vc_state) {
2182         case ESesc:
2183                 vc->vc_state = ESnormal;
2184                 switch (c) {
2185                 case '[':
2186                         vc->vc_state = ESsquare;
2187                         return;
2188                 case ']':
2189                         vc->vc_state = ESnonstd;
2190                         return;
2191                 case '%':
2192                         vc->vc_state = ESpercent;
2193                         return;
2194                 case 'E':
2195                         cr(vc);
2196                         lf(vc);
2197                         return;
2198                 case 'M':
2199                         ri(vc);
2200                         return;
2201                 case 'D':
2202                         lf(vc);
2203                         return;
2204                 case 'H':
2205                         vc->vc_tab_stop[7 & (vc->vc_x >> 5)] |= (1 << (vc->vc_x & 31));
2206                         return;
2207                 case 'Z':
2208                         respond_ID(tty);
2209                         return;
2210                 case '7':
2211                         save_cur(vc);
2212                         return;
2213                 case '8':
2214                         restore_cur(vc);
2215                         return;
2216                 case '(':
2217                         vc->vc_state = ESsetG0;
2218                         return;
2219                 case ')':
2220                         vc->vc_state = ESsetG1;
2221                         return;
2222                 case '#':
2223                         vc->vc_state = EShash;
2224                         return;
2225                 case 'c':
2226                         reset_terminal(vc, 1);
2227                         return;
2228                 case '>':  /* Numeric keypad */
2229                         clr_kbd(vc, kbdapplic);
2230                         return;
2231                 case '=':  /* Appl. keypad */
2232                         set_kbd(vc, kbdapplic);
2233                         return;
2234                 }
2235                 return;
2236         case ESnonstd:
2237                 if (c=='P') {   /* palette escape sequence */
2238                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2239                                 vc->vc_par[vc->vc_npar] = 0;
2240                         vc->vc_npar = 0;
2241                         vc->vc_state = ESpalette;
2242                         return;
2243                 } else if (c=='R') {   /* reset palette */
2244                         reset_palette(vc);
2245                         vc->vc_state = ESnormal;
2246                 } else if (c>='0' && c<='9')
2247                         vc->vc_state = ESosc;
2248                 else
2249                         vc->vc_state = ESnormal;
2250                 return;
2251         case ESpalette:
2252                 if (isxdigit(c)) {
2253                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
2254                         if (vc->vc_npar == 7) {
2255                                 int i = vc->vc_par[0] * 3, j = 1;
2256                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2257                                 vc->vc_palette[i++] += vc->vc_par[j++];
2258                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2259                                 vc->vc_palette[i++] += vc->vc_par[j++];
2260                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
2261                                 vc->vc_palette[i] += vc->vc_par[j];
2262                                 set_palette(vc);
2263                                 vc->vc_state = ESnormal;
2264                         }
2265                 } else
2266                         vc->vc_state = ESnormal;
2267                 return;
2268         case ESsquare:
2269                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
2270                         vc->vc_par[vc->vc_npar] = 0;
2271                 vc->vc_npar = 0;
2272                 vc->vc_state = ESgetpars;
2273                 if (c == '[') { /* Function key */
2274                         vc->vc_state=ESfunckey;
2275                         return;
2276                 }
2277                 switch (c) {
2278                 case '?':
2279                         vc->vc_priv = EPdec;
2280                         return;
2281                 case '>':
2282                         vc->vc_priv = EPgt;
2283                         return;
2284                 case '=':
2285                         vc->vc_priv = EPeq;
2286                         return;
2287                 case '<':
2288                         vc->vc_priv = EPlt;
2289                         return;
2290                 }
2291                 vc->vc_priv = EPecma;
2292                 /* fall through */
2293         case ESgetpars:
2294                 if (c == ';' && vc->vc_npar < NPAR - 1) {
2295                         vc->vc_npar++;
2296                         return;
2297                 } else if (c>='0' && c<='9') {
2298                         vc->vc_par[vc->vc_npar] *= 10;
2299                         vc->vc_par[vc->vc_npar] += c - '0';
2300                         return;
2301                 }
2302                 if (c >= 0x20 && c <= 0x3f) { /* 0x2x, 0x3a and 0x3c - 0x3f */
2303                         vc->vc_state = EScsiignore;
2304                         return;
2305                 }
2306                 vc->vc_state = ESnormal;
2307                 switch(c) {
2308                 case 'h':
2309                         if (vc->vc_priv <= EPdec)
2310                                 set_mode(vc, 1);
2311                         return;
2312                 case 'l':
2313                         if (vc->vc_priv <= EPdec)
2314                                 set_mode(vc, 0);
2315                         return;
2316                 case 'c':
2317                         if (vc->vc_priv == EPdec) {
2318                                 if (vc->vc_par[0])
2319                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
2320                                 else
2321                                         vc->vc_cursor_type = cur_default;
2322                                 return;
2323                         }
2324                         break;
2325                 case 'm':
2326                         if (vc->vc_priv == EPdec) {
2327                                 clear_selection();
2328                                 if (vc->vc_par[0])
2329                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
2330                                 else
2331                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
2332                                 return;
2333                         }
2334                         break;
2335                 case 'n':
2336                         if (vc->vc_priv == EPecma) {
2337                                 if (vc->vc_par[0] == 5)
2338                                         status_report(tty);
2339                                 else if (vc->vc_par[0] == 6)
2340                                         cursor_report(vc, tty);
2341                         }
2342                         return;
2343                 }
2344                 if (vc->vc_priv != EPecma) {
2345                         vc->vc_priv = EPecma;
2346                         return;
2347                 }
2348                 switch(c) {
2349                 case 'G': case '`':
2350                         if (vc->vc_par[0])
2351                                 vc->vc_par[0]--;
2352                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
2353                         return;
2354                 case 'A':
2355                         if (!vc->vc_par[0])
2356                                 vc->vc_par[0]++;
2357                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
2358                         return;
2359                 case 'B': case 'e':
2360                         if (!vc->vc_par[0])
2361                                 vc->vc_par[0]++;
2362                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
2363                         return;
2364                 case 'C': case 'a':
2365                         if (!vc->vc_par[0])
2366                                 vc->vc_par[0]++;
2367                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
2368                         return;
2369                 case 'D':
2370                         if (!vc->vc_par[0])
2371                                 vc->vc_par[0]++;
2372                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
2373                         return;
2374                 case 'E':
2375                         if (!vc->vc_par[0])
2376                                 vc->vc_par[0]++;
2377                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
2378                         return;
2379                 case 'F':
2380                         if (!vc->vc_par[0])
2381                                 vc->vc_par[0]++;
2382                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
2383                         return;
2384                 case 'd':
2385                         if (vc->vc_par[0])
2386                                 vc->vc_par[0]--;
2387                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
2388                         return;
2389                 case 'H': case 'f':
2390                         if (vc->vc_par[0])
2391                                 vc->vc_par[0]--;
2392                         if (vc->vc_par[1])
2393                                 vc->vc_par[1]--;
2394                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
2395                         return;
2396                 case 'J':
2397                         csi_J(vc, vc->vc_par[0]);
2398                         return;
2399                 case 'K':
2400                         csi_K(vc, vc->vc_par[0]);
2401                         return;
2402                 case 'L':
2403                         csi_L(vc, vc->vc_par[0]);
2404                         return;
2405                 case 'M':
2406                         csi_M(vc, vc->vc_par[0]);
2407                         return;
2408                 case 'P':
2409                         csi_P(vc, vc->vc_par[0]);
2410                         return;
2411                 case 'c':
2412                         if (!vc->vc_par[0])
2413                                 respond_ID(tty);
2414                         return;
2415                 case 'g':
2416                         if (!vc->vc_par[0])
2417                                 vc->vc_tab_stop[7 & (vc->vc_x >> 5)] &= ~(1 << (vc->vc_x & 31));
2418                         else if (vc->vc_par[0] == 3) {
2419                                 vc->vc_tab_stop[0] =
2420                                         vc->vc_tab_stop[1] =
2421                                         vc->vc_tab_stop[2] =
2422                                         vc->vc_tab_stop[3] =
2423                                         vc->vc_tab_stop[4] =
2424                                         vc->vc_tab_stop[5] =
2425                                         vc->vc_tab_stop[6] =
2426                                         vc->vc_tab_stop[7] = 0;
2427                         }
2428                         return;
2429                 case 'm':
2430                         csi_m(vc);
2431                         return;
2432                 case 'q': /* DECLL - but only 3 leds */
2433                         /* map 0,1,2,3 to 0,1,2,4 */
2434                         if (vc->vc_par[0] < 4)
2435                                 vt_set_led_state(vc->vc_num,
2436                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
2437                         return;
2438                 case 'r':
2439                         if (!vc->vc_par[0])
2440                                 vc->vc_par[0]++;
2441                         if (!vc->vc_par[1])
2442                                 vc->vc_par[1] = vc->vc_rows;
2443                         /* Minimum allowed region is 2 lines */
2444                         if (vc->vc_par[0] < vc->vc_par[1] &&
2445                             vc->vc_par[1] <= vc->vc_rows) {
2446                                 vc->vc_top = vc->vc_par[0] - 1;
2447                                 vc->vc_bottom = vc->vc_par[1];
2448                                 gotoxay(vc, 0, 0);
2449                         }
2450                         return;
2451                 case 's':
2452                         save_cur(vc);
2453                         return;
2454                 case 'u':
2455                         restore_cur(vc);
2456                         return;
2457                 case 'X':
2458                         csi_X(vc, vc->vc_par[0]);
2459                         return;
2460                 case '@':
2461                         csi_at(vc, vc->vc_par[0]);
2462                         return;
2463                 case ']': /* setterm functions */
2464                         setterm_command(vc);
2465                         return;
2466                 }
2467                 return;
2468         case EScsiignore:
2469                 if (c >= 20 && c <= 0x3f)
2470                         return;
2471                 vc->vc_state = ESnormal;
2472                 return;
2473         case ESpercent:
2474                 vc->vc_state = ESnormal;
2475                 switch (c) {
2476                 case '@':  /* defined in ISO 2022 */
2477                         vc->vc_utf = 0;
2478                         return;
2479                 case 'G':  /* prelim official escape code */
2480                 case '8':  /* retained for compatibility */
2481                         vc->vc_utf = 1;
2482                         return;
2483                 }
2484                 return;
2485         case ESfunckey:
2486                 vc->vc_state = ESnormal;
2487                 return;
2488         case EShash:
2489                 vc->vc_state = ESnormal;
2490                 if (c == '8') {
2491                         /* DEC screen alignment test. kludge :-) */
2492                         vc->vc_video_erase_char =
2493                                 (vc->vc_video_erase_char & 0xff00) | 'E';
2494                         csi_J(vc, 2);
2495                         vc->vc_video_erase_char =
2496                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2497                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2498                 }
2499                 return;
2500         case ESsetG0:
2501                 if (c == '0')
2502                         vc->vc_G0_charset = GRAF_MAP;
2503                 else if (c == 'B')
2504                         vc->vc_G0_charset = LAT1_MAP;
2505                 else if (c == 'U')
2506                         vc->vc_G0_charset = IBMPC_MAP;
2507                 else if (c == 'K')
2508                         vc->vc_G0_charset = USER_MAP;
2509                 if (vc->vc_charset == 0)
2510                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2511                 vc->vc_state = ESnormal;
2512                 return;
2513         case ESsetG1:
2514                 if (c == '0')
2515                         vc->vc_G1_charset = GRAF_MAP;
2516                 else if (c == 'B')
2517                         vc->vc_G1_charset = LAT1_MAP;
2518                 else if (c == 'U')
2519                         vc->vc_G1_charset = IBMPC_MAP;
2520                 else if (c == 'K')
2521                         vc->vc_G1_charset = USER_MAP;
2522                 if (vc->vc_charset == 1)
2523                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2524                 vc->vc_state = ESnormal;
2525                 return;
2526         case ESosc:
2527                 return;
2528         default:
2529                 vc->vc_state = ESnormal;
2530         }
2531 }
2532 
2533 /* is_double_width() is based on the wcwidth() implementation by
2534  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2535  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2536  */
2537 struct interval {
2538         uint32_t first;
2539         uint32_t last;
2540 };
2541 
2542 static int ucs_cmp(const void *key, const void *elt)
2543 {
2544         uint32_t ucs = *(uint32_t *)key;
2545         struct interval e = *(struct interval *) elt;
2546 
2547         if (ucs > e.last)
2548                 return 1;
2549         else if (ucs < e.first)
2550                 return -1;
2551         return 0;
2552 }
2553 
2554 static int is_double_width(uint32_t ucs)
2555 {
2556         static const struct interval double_width[] = {
2557                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2558                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2559                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2560                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2561         };
2562         if (ucs < double_width[0].first ||
2563             ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
2564                 return 0;
2565 
2566         return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
2567                         sizeof(struct interval), ucs_cmp) != NULL;
2568 }
2569 
2570 static void con_flush(struct vc_data *vc, unsigned long draw_from,
2571                 unsigned long draw_to, int *draw_x)
2572 {
2573         if (*draw_x < 0)
2574                 return;
2575 
2576         vc->vc_sw->con_putcs(vc, (u16 *)draw_from,
2577                         (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x);
2578         *draw_x = -1;
2579 }
2580 
2581 /* acquires console_lock */
2582 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2583 {
2584         int c, next_c, tc, ok, n = 0, draw_x = -1;
2585         unsigned int currcons;
2586         unsigned long draw_from = 0, draw_to = 0;
2587         struct vc_data *vc;
2588         unsigned char vc_attr;
2589         struct vt_notifier_param param;
2590         uint8_t rescan;
2591         uint8_t inverse;
2592         uint8_t width;
2593         u16 himask, charmask;
2594 
2595         if (in_interrupt())
2596                 return count;
2597 
2598         might_sleep();
2599 
2600         console_lock();
2601         vc = tty->driver_data;
2602         if (vc == NULL) {
2603                 pr_err("vt: argh, driver_data is NULL !\n");
2604                 console_unlock();
2605                 return 0;
2606         }
2607 
2608         currcons = vc->vc_num;
2609         if (!vc_cons_allocated(currcons)) {
2610                 /* could this happen? */
2611                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2612                 console_unlock();
2613                 return 0;
2614         }
2615 
2616         himask = vc->vc_hi_font_mask;
2617         charmask = himask ? 0x1ff : 0xff;
2618 
2619         /* undraw cursor first */
2620         if (con_is_fg(vc))
2621                 hide_cursor(vc);
2622 
2623         param.vc = vc;
2624 
2625         while (!tty->stopped && count) {
2626                 int orig = *buf;
2627                 c = orig;
2628                 buf++;
2629                 n++;
2630                 count--;
2631                 rescan = 0;
2632                 inverse = 0;
2633                 width = 1;
2634 
2635                 /* Do no translation at all in control states */
2636                 if (vc->vc_state != ESnormal) {
2637                         tc = c;
2638                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2639                     /* Combine UTF-8 into Unicode in vc_utf_char.
2640                      * vc_utf_count is the number of continuation bytes still
2641                      * expected to arrive.
2642                      * vc_npar is the number of continuation bytes arrived so
2643                      * far
2644                      */
2645 rescan_last_byte:
2646                     if ((c & 0xc0) == 0x80) {
2647                         /* Continuation byte received */
2648                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2649                         if (vc->vc_utf_count) {
2650                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2651                             vc->vc_npar++;
2652                             if (--vc->vc_utf_count) {
2653                                 /* Still need some bytes */
2654                                 continue;
2655                             }
2656                             /* Got a whole character */
2657                             c = vc->vc_utf_char;
2658                             /* Reject overlong sequences */
2659                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2660                                         c > utf8_length_changes[vc->vc_npar])
2661                                 c = 0xfffd;
2662                         } else {
2663                             /* Unexpected continuation byte */
2664                             vc->vc_utf_count = 0;
2665                             c = 0xfffd;
2666                         }
2667                     } else {
2668                         /* Single ASCII byte or first byte of a sequence received */
2669                         if (vc->vc_utf_count) {
2670                             /* Continuation byte expected */
2671                             rescan = 1;
2672                             vc->vc_utf_count = 0;
2673                             c = 0xfffd;
2674                         } else if (c > 0x7f) {
2675                             /* First byte of a multibyte sequence received */
2676                             vc->vc_npar = 0;
2677                             if ((c & 0xe0) == 0xc0) {
2678                                 vc->vc_utf_count = 1;
2679                                 vc->vc_utf_char = (c & 0x1f);
2680                             } else if ((c & 0xf0) == 0xe0) {
2681                                 vc->vc_utf_count = 2;
2682                                 vc->vc_utf_char = (c & 0x0f);
2683                             } else if ((c & 0xf8) == 0xf0) {
2684                                 vc->vc_utf_count = 3;
2685                                 vc->vc_utf_char = (c & 0x07);
2686                             } else if ((c & 0xfc) == 0xf8) {
2687                                 vc->vc_utf_count = 4;
2688                                 vc->vc_utf_char = (c & 0x03);
2689                             } else if ((c & 0xfe) == 0xfc) {
2690                                 vc->vc_utf_count = 5;
2691                                 vc->vc_utf_char = (c & 0x01);
2692                             } else {
2693                                 /* 254 and 255 are invalid */
2694                                 c = 0xfffd;
2695                             }
2696                             if (vc->vc_utf_count) {
2697                                 /* Still need some bytes */
2698                                 continue;
2699                             }
2700                         }
2701                         /* Nothing to do if an ASCII byte was received */
2702                     }
2703                     /* End of UTF-8 decoding. */
2704                     /* c is the received character, or U+FFFD for invalid sequences. */
2705                     /* Replace invalid Unicode code points with U+FFFD too */
2706                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2707                         c = 0xfffd;
2708                     tc = c;
2709                 } else {        /* no utf or alternate charset mode */
2710                     tc = vc_translate(vc, c);
2711                 }
2712 
2713                 param.c = tc;
2714                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2715                                         &param) == NOTIFY_STOP)
2716                         continue;
2717 
2718                 /* If the original code was a control character we
2719                  * only allow a glyph to be displayed if the code is
2720                  * not normally used (such as for cursor movement) or
2721                  * if the disp_ctrl mode has been explicitly enabled.
2722                  * Certain characters (as given by the CTRL_ALWAYS
2723                  * bitmap) are always displayed as control characters,
2724                  * as the console would be pretty useless without
2725                  * them; to display an arbitrary font position use the
2726                  * direct-to-font zone in UTF-8 mode.
2727                  */
2728                 ok = tc && (c >= 32 ||
2729                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2730                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2731                         && (c != 127 || vc->vc_disp_ctrl)
2732                         && (c != 128+27);
2733 
2734                 if (vc->vc_state == ESnormal && ok) {
2735                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2736                                 if (is_double_width(c))
2737                                         width = 2;
2738                         }
2739                         /* Now try to find out how to display it */
2740                         tc = conv_uni_to_pc(vc, tc);
2741                         if (tc & ~charmask) {
2742                                 if (tc == -1 || tc == -2) {
2743                                     continue; /* nothing to display */
2744                                 }
2745                                 /* Glyph not found */
2746                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2747                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2748                                        This would make absolutely no sense with Unicode in mind,
2749                                        but do this for ASCII characters since a font may lack
2750                                        Unicode mapping info and we don't want to end up with
2751                                        having question marks only. */
2752                                     tc = c;
2753                                 } else {
2754                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2755                                     tc = conv_uni_to_pc(vc, 0xfffd);
2756                                     if (tc < 0) {
2757                                         inverse = 1;
2758                                         tc = conv_uni_to_pc(vc, '?');
2759                                         if (tc < 0) tc = '?';
2760                                     }
2761                                 }
2762                         }
2763 
2764                         if (!inverse) {
2765                                 vc_attr = vc->vc_attr;
2766                         } else {
2767                                 /* invert vc_attr */
2768                                 if (!vc->vc_can_do_color) {
2769                                         vc_attr = (vc->vc_attr) ^ 0x08;
2770                                 } else if (vc->vc_hi_font_mask == 0x100) {
2771                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2772                                 } else {
2773                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2774                                 }
2775                                 con_flush(vc, draw_from, draw_to, &draw_x);
2776                         }
2777 
2778                         next_c = c;
2779                         while (1) {
2780                                 if (vc->vc_need_wrap || vc->vc_decim)
2781                                         con_flush(vc, draw_from, draw_to,
2782                                                         &draw_x);
2783                                 if (vc->vc_need_wrap) {
2784                                         cr(vc);
2785                                         lf(vc);
2786                                 }
2787                                 if (vc->vc_decim)
2788                                         insert_char(vc, 1);
2789                                 vc_uniscr_putc(vc, next_c);
2790                                 scr_writew(himask ?
2791                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2792                                              (vc_attr << 8) + tc,
2793                                            (u16 *) vc->vc_pos);
2794                                 if (con_should_update(vc) && draw_x < 0) {
2795                                         draw_x = vc->vc_x;
2796                                         draw_from = vc->vc_pos;
2797                                 }
2798                                 if (vc->vc_x == vc->vc_cols - 1) {
2799                                         vc->vc_need_wrap = vc->vc_decawm;
2800                                         draw_to = vc->vc_pos + 2;
2801                                 } else {
2802                                         vc->vc_x++;
2803                                         draw_to = (vc->vc_pos += 2);
2804                                 }
2805 
2806                                 if (!--width) break;
2807 
2808                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2809                                 if (tc < 0) tc = ' ';
2810                                 next_c = ' ';
2811                         }
2812                         notify_write(vc, c);
2813 
2814                         if (inverse)
2815                                 con_flush(vc, draw_from, draw_to, &draw_x);
2816 
2817                         if (rescan) {
2818                                 rescan = 0;
2819                                 inverse = 0;
2820                                 width = 1;
2821                                 c = orig;
2822                                 goto rescan_last_byte;
2823                         }
2824                         continue;
2825                 }
2826                 con_flush(vc, draw_from, draw_to, &draw_x);
2827                 do_con_trol(tty, vc, orig);
2828         }
2829         con_flush(vc, draw_from, draw_to, &draw_x);
2830         vc_uniscr_debug_check(vc);
2831         console_conditional_schedule();
2832         notify_update(vc);
2833         console_unlock();
2834         return n;
2835 }
2836 
2837 /*
2838  * This is the console switching callback.
2839  *
2840  * Doing console switching in a process context allows
2841  * us to do the switches asynchronously (needed when we want
2842  * to switch due to a keyboard interrupt).  Synchronization
2843  * with other console code and prevention of re-entrancy is
2844  * ensured with console_lock.
2845  */
2846 static void console_callback(struct work_struct *ignored)
2847 {
2848         console_lock();
2849 
2850         if (want_console >= 0) {
2851                 if (want_console != fg_console &&
2852                     vc_cons_allocated(want_console)) {
2853                         hide_cursor(vc_cons[fg_console].d);
2854                         change_console(vc_cons[want_console].d);
2855                         /* we only changed when the console had already
2856                            been allocated - a new console is not created
2857                            in an interrupt routine */
2858                 }
2859                 want_console = -1;
2860         }
2861         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2862                 do_poke_blanked_console = 0;
2863                 poke_blanked_console();
2864         }
2865         if (scrollback_delta) {
2866                 struct vc_data *vc = vc_cons[fg_console].d;
2867                 clear_selection();
2868                 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
2869                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2870                 scrollback_delta = 0;
2871         }
2872         if (blank_timer_expired) {
2873                 do_blank_screen(0);
2874                 blank_timer_expired = 0;
2875         }
2876         notify_update(vc_cons[fg_console].d);
2877 
2878         console_unlock();
2879 }
2880 
2881 int set_console(int nr)
2882 {
2883         struct vc_data *vc = vc_cons[fg_console].d;
2884 
2885         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2886                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2887 
2888                 /*
2889                  * Console switch will fail in console_callback() or
2890                  * change_console() so there is no point scheduling
2891                  * the callback
2892                  *
2893                  * Existing set_console() users don't check the return
2894                  * value so this shouldn't break anything
2895                  */
2896                 return -EINVAL;
2897         }
2898 
2899         want_console = nr;
2900         schedule_console_callback();
2901 
2902         return 0;
2903 }
2904 
2905 struct tty_driver *console_driver;
2906 
2907 #ifdef CONFIG_VT_CONSOLE
2908 
2909 /**
2910  * vt_kmsg_redirect() - Sets/gets the kernel message console
2911  * @new:        The new virtual terminal number or -1 if the console should stay
2912  *              unchanged
2913  *
2914  * By default, the kernel messages are always printed on the current virtual
2915  * console. However, the user may modify that default with the
2916  * TIOCL_SETKMSGREDIRECT ioctl call.
2917  *
2918  * This function sets the kernel message console to be @new. It returns the old
2919  * virtual console number. The virtual terminal number 0 (both as parameter and
2920  * return value) means no redirection (i.e. always printed on the currently
2921  * active console).
2922  *
2923  * The parameter -1 means that only the current console is returned, but the
2924  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2925  * case to make the code more understandable.
2926  *
2927  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2928  * the parameter and always returns 0.
2929  */
2930 int vt_kmsg_redirect(int new)
2931 {
2932         static int kmsg_con;
2933 
2934         if (new != -1)
2935                 return xchg(&kmsg_con, new);
2936         else
2937                 return kmsg_con;
2938 }
2939 
2940 /*
2941  *      Console on virtual terminal
2942  *
2943  * The console must be locked when we get here.
2944  */
2945 
2946 static void vt_console_print(struct console *co, const char *b, unsigned count)
2947 {
2948         struct vc_data *vc = vc_cons[fg_console].d;
2949         unsigned char c;
2950         static DEFINE_SPINLOCK(printing_lock);
2951         const ushort *start;
2952         ushort start_x, cnt;
2953         int kmsg_console;
2954 
2955         /* console busy or not yet initialized */
2956         if (!printable)
2957                 return;
2958         if (!spin_trylock(&printing_lock))
2959                 return;
2960 
2961         kmsg_console = vt_get_kmsg_redirect();
2962         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2963                 vc = vc_cons[kmsg_console - 1].d;
2964 
2965         if (!vc_cons_allocated(fg_console)) {
2966                 /* impossible */
2967                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2968                 goto quit;
2969         }
2970 
2971         if (vc->vc_mode != KD_TEXT)
2972                 goto quit;
2973 
2974         /* undraw cursor first */
2975         if (con_is_fg(vc))
2976                 hide_cursor(vc);
2977 
2978         start = (ushort *)vc->vc_pos;
2979         start_x = vc->vc_x;
2980         cnt = 0;
2981         while (count--) {
2982                 c = *b++;
2983                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2984                         if (cnt && con_is_visible(vc))
2985                                 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, start_x);
2986                         cnt = 0;
2987                         if (c == 8) {           /* backspace */
2988                                 bs(vc);
2989                                 start = (ushort *)vc->vc_pos;
2990                                 start_x = vc->vc_x;
2991                                 continue;
2992                         }
2993                         if (c != 13)
2994                                 lf(vc);
2995                         cr(vc);
2996                         start = (ushort *)vc->vc_pos;
2997                         start_x = vc->vc_x;
2998                         if (c == 10 || c == 13)
2999                                 continue;
3000                 }
3001                 vc_uniscr_putc(vc, c);
3002                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
3003                 notify_write(vc, c);
3004                 cnt++;
3005                 if (vc->vc_x == vc->vc_cols - 1) {
3006                         vc->vc_need_wrap = 1;
3007                 } else {
3008                         vc->vc_pos += 2;
3009                         vc->vc_x++;
3010                 }
3011         }
3012         if (cnt && con_is_visible(vc))
3013                 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, start_x);
3014         set_cursor(vc);
3015         notify_update(vc);
3016 
3017 quit:
3018         spin_unlock(&printing_lock);
3019 }
3020 
3021 static struct tty_driver *vt_console_device(struct console *c, int *index)
3022 {
3023         *index = c->index ? c->index-1 : fg_console;
3024         return console_driver;
3025 }
3026 
3027 static struct console vt_console_driver = {
3028         .name           = "tty",
3029         .write          = vt_console_print,
3030         .device         = vt_console_device,
3031         .unblank        = unblank_screen,
3032         .flags          = CON_PRINTBUFFER,
3033         .index          = -1,
3034 };
3035 #endif
3036 
3037 /*
3038  *      Handling of Linux-specific VC ioctls
3039  */
3040 
3041 /*
3042  * Generally a bit racy with respect to console_lock();.
3043  *
3044  * There are some functions which don't need it.
3045  *
3046  * There are some functions which can sleep for arbitrary periods
3047  * (paste_selection) but we don't need the lock there anyway.
3048  *
3049  * set_selection_user has locking, and definitely needs it
3050  */
3051 
3052 int tioclinux(struct tty_struct *tty, unsigned long arg)
3053 {
3054         char type, data;
3055         char __user *p = (char __user *)arg;
3056         int lines;
3057         int ret;
3058 
3059         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
3060                 return -EPERM;
3061         if (get_user(type, p))
3062                 return -EFAULT;
3063         ret = 0;
3064 
3065         switch (type)
3066         {
3067                 case TIOCL_SETSEL:
3068                         ret = set_selection_user((struct tiocl_selection
3069                                                  __user *)(p+1), tty);
3070                         break;
3071                 case TIOCL_PASTESEL:
3072                         ret = paste_selection(tty);
3073                         break;
3074                 case TIOCL_UNBLANKSCREEN:
3075                         console_lock();
3076                         unblank_screen();
3077                         console_unlock();
3078                         break;
3079                 case TIOCL_SELLOADLUT:
3080                         console_lock();
3081                         ret = sel_loadlut(p);
3082                         console_unlock();
3083                         break;
3084                 case TIOCL_GETSHIFTSTATE:
3085 
3086         /*
3087          * Make it possible to react to Shift+Mousebutton.
3088          * Note that 'shift_state' is an undocumented
3089          * kernel-internal variable; programs not closely
3090          * related to the kernel should not use this.
3091          */
3092                         data = vt_get_shift_state();
3093                         ret = put_user(data, p);
3094                         break;
3095                 case TIOCL_GETMOUSEREPORTING:
3096                         console_lock(); /* May be overkill */
3097                         data = mouse_reporting();
3098                         console_unlock();
3099                         ret = put_user(data, p);
3100                         break;
3101                 case TIOCL_SETVESABLANK:
3102                         console_lock();
3103                         ret = set_vesa_blanking(p);
3104                         console_unlock();
3105                         break;
3106                 case TIOCL_GETKMSGREDIRECT:
3107                         data = vt_get_kmsg_redirect();
3108                         ret = put_user(data, p);
3109                         break;
3110                 case TIOCL_SETKMSGREDIRECT:
3111                         if (!capable(CAP_SYS_ADMIN)) {
3112                                 ret = -EPERM;
3113                         } else {
3114                                 if (get_user(data, p+1))
3115                                         ret = -EFAULT;
3116                                 else
3117                                         vt_kmsg_redirect(data);
3118                         }
3119                         break;
3120                 case TIOCL_GETFGCONSOLE:
3121                         /* No locking needed as this is a transiently
3122                            correct return anyway if the caller hasn't
3123                            disabled switching */
3124                         ret = fg_console;
3125                         break;
3126                 case TIOCL_SCROLLCONSOLE:
3127                         if (get_user(lines, (s32 __user *)(p+4))) {
3128                                 ret = -EFAULT;
3129                         } else {
3130                                 /* Need the console lock here. Note that lots
3131                                    of other calls need fixing before the lock
3132                                    is actually useful ! */
3133                                 console_lock();
3134                                 scrollfront(vc_cons[fg_console].d, lines);
3135                                 console_unlock();
3136                                 ret = 0;
3137                         }
3138                         break;
3139                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
3140                         console_lock();
3141                         ignore_poke = 1;
3142                         do_blank_screen(0);
3143                         console_unlock();
3144                         break;
3145                 case TIOCL_BLANKEDSCREEN:
3146                         ret = console_blanked;
3147                         break;
3148                 default:
3149                         ret = -EINVAL;
3150                         break;
3151         }
3152         return ret;
3153 }
3154 
3155 /*
3156  * /dev/ttyN handling
3157  */
3158 
3159 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
3160 {
3161         int     retval;
3162 
3163         retval = do_con_write(tty, buf, count);
3164         con_flush_chars(tty);
3165 
3166         return retval;
3167 }
3168 
3169 static int con_put_char(struct tty_struct *tty, unsigned char ch)
3170 {
3171         if (in_interrupt())
3172                 return 0;       /* n_r3964 calls put_char() from interrupt context */
3173         return do_con_write(tty, &ch, 1);
3174 }
3175 
3176 static int con_write_room(struct tty_struct *tty)
3177 {
3178         if (tty->stopped)
3179                 return 0;
3180         return 32768;           /* No limit, really; we're not buffering */
3181 }
3182 
3183 static int con_chars_in_buffer(struct tty_struct *tty)
3184 {
3185         return 0;               /* we're not buffering */
3186 }
3187 
3188 /*
3189  * con_throttle and con_unthrottle are only used for
3190  * paste_selection(), which has to stuff in a large number of
3191  * characters...
3192  */
3193 static void con_throttle(struct tty_struct *tty)
3194 {
3195 }
3196 
3197 static void con_unthrottle(struct tty_struct *tty)
3198 {
3199         struct vc_data *vc = tty->driver_data;
3200 
3201         wake_up_interruptible(&vc->paste_wait);
3202 }
3203 
3204 /*
3205  * Turn the Scroll-Lock LED on when the tty is stopped
3206  */
3207 static void con_stop(struct tty_struct *tty)
3208 {
3209         int console_num;
3210         if (!tty)
3211                 return;
3212         console_num = tty->index;
3213         if (!vc_cons_allocated(console_num))
3214                 return;
3215         vt_kbd_con_stop(console_num);
3216 }
3217 
3218 /*
3219  * Turn the Scroll-Lock LED off when the console is started
3220  */
3221 static void con_start(struct tty_struct *tty)
3222 {
3223         int console_num;
3224         if (!tty)
3225                 return;
3226         console_num = tty->index;
3227         if (!vc_cons_allocated(console_num))
3228                 return;
3229         vt_kbd_con_start(console_num);
3230 }
3231 
3232 static void con_flush_chars(struct tty_struct *tty)
3233 {
3234         struct vc_data *vc;
3235 
3236         if (in_interrupt())     /* from flush_to_ldisc */
3237                 return;
3238 
3239         /* if we race with con_close(), vt may be null */
3240         console_lock();
3241         vc = tty->driver_data;
3242         if (vc)
3243                 set_cursor(vc);
3244         console_unlock();
3245 }
3246 
3247 /*
3248  * Allocate the console screen memory.
3249  */
3250 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
3251 {
3252         unsigned int currcons = tty->index;
3253         struct vc_data *vc;
3254         int ret;
3255 
3256         console_lock();
3257         ret = vc_allocate(currcons);
3258         if (ret)
3259                 goto unlock;
3260 
3261         vc = vc_cons[currcons].d;
3262 
3263         /* Still being freed */
3264         if (vc->port.tty) {
3265                 ret = -ERESTARTSYS;
3266                 goto unlock;
3267         }
3268 
3269         ret = tty_port_install(&vc->port, driver, tty);
3270         if (ret)
3271                 goto unlock;
3272 
3273         tty->driver_data = vc;
3274         vc->port.tty = tty;
3275         tty_port_get(&vc->port);
3276 
3277         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
3278                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
3279                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
3280         }
3281         if (vc->vc_utf)
3282                 tty->termios.c_iflag |= IUTF8;
3283         else
3284                 tty->termios.c_iflag &= ~IUTF8;
3285 unlock:
3286         console_unlock();
3287         return ret;
3288 }
3289 
3290 static int con_open(struct tty_struct *tty, struct file *filp)
3291 {
3292         /* everything done in install */
3293         return 0;
3294 }
3295 
3296 
3297 static void con_close(struct tty_struct *tty, struct file *filp)
3298 {
3299         /* Nothing to do - we defer to shutdown */
3300 }
3301 
3302 static void con_shutdown(struct tty_struct *tty)
3303 {
3304         struct vc_data *vc = tty->driver_data;
3305         BUG_ON(vc == NULL);
3306         console_lock();
3307         vc->port.tty = NULL;
3308         console_unlock();
3309 }
3310 
3311 static void con_cleanup(struct tty_struct *tty)
3312 {
3313         struct vc_data *vc = tty->driver_data;
3314 
3315         tty_port_put(&vc->port);
3316 }
3317 
3318 static int default_color           = 7; /* white */
3319 static int default_italic_color    = 2; // green (ASCII)
3320 static int default_underline_color = 3; // cyan (ASCII)
3321 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
3322 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
3323 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
3324 
3325 static void vc_init(struct vc_data *vc, unsigned int rows,
3326                     unsigned int cols, int do_clear)
3327 {
3328         int j, k ;
3329 
3330         vc->vc_cols = cols;
3331         vc->vc_rows = rows;
3332         vc->vc_size_row = cols << 1;
3333         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
3334 
3335         set_origin(vc);
3336         vc->vc_pos = vc->vc_origin;
3337         reset_vc(vc);
3338         for (j=k=0; j<16; j++) {
3339                 vc->vc_palette[k++] = default_red[j] ;
3340                 vc->vc_palette[k++] = default_grn[j] ;
3341                 vc->vc_palette[k++] = default_blu[j] ;
3342         }
3343         vc->vc_def_color       = default_color;
3344         vc->vc_ulcolor         = default_underline_color;
3345         vc->vc_itcolor         = default_italic_color;
3346         vc->vc_halfcolor       = 0x08;   /* grey */
3347         init_waitqueue_head(&vc->paste_wait);
3348         reset_terminal(vc, do_clear);
3349 }
3350 
3351 /*
3352  * This routine initializes console interrupts, and does nothing
3353  * else. If you want the screen to clear, call tty_write with
3354  * the appropriate escape-sequence.
3355  */
3356 
3357 static int __init con_init(void)
3358 {
3359         const char *display_desc = NULL;
3360         struct vc_data *vc;
3361         unsigned int currcons = 0, i;
3362 
3363         console_lock();
3364 
3365         if (conswitchp)
3366                 display_desc = conswitchp->con_startup();
3367         if (!display_desc) {
3368                 fg_console = 0;
3369                 console_unlock();
3370                 return 0;
3371         }
3372 
3373         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3374                 struct con_driver *con_driver = &registered_con_driver[i];
3375 
3376                 if (con_driver->con == NULL) {
3377                         con_driver->con = conswitchp;
3378                         con_driver->desc = display_desc;
3379                         con_driver->flag = CON_DRIVER_FLAG_INIT;
3380                         con_driver->first = 0;
3381                         con_driver->last = MAX_NR_CONSOLES - 1;
3382                         break;
3383                 }
3384         }
3385 
3386         for (i = 0; i < MAX_NR_CONSOLES; i++)
3387                 con_driver_map[i] = conswitchp;
3388 
3389         if (blankinterval) {
3390                 blank_state = blank_normal_wait;
3391                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3392         }
3393 
3394         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
3395                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
3396                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
3397                 tty_port_init(&vc->port);
3398                 visual_init(vc, currcons, 1);
3399                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
3400                 vc_init(vc, vc->vc_rows, vc->vc_cols,
3401                         currcons || !vc->vc_sw->con_save_screen);
3402         }
3403         currcons = fg_console = 0;
3404         master_display_fg = vc = vc_cons[currcons].d;
3405         set_origin(vc);
3406         save_screen(vc);
3407         gotoxy(vc, vc->vc_x, vc->vc_y);
3408         csi_J(vc, 0);
3409         update_screen(vc);
3410         pr_info("Console: %s %s %dx%d\n",
3411                 vc->vc_can_do_color ? "colour" : "mono",
3412                 display_desc, vc->vc_cols, vc->vc_rows);
3413         printable = 1;
3414 
3415         console_unlock();
3416 
3417 #ifdef CONFIG_VT_CONSOLE
3418         register_console(&vt_console_driver);
3419 #endif
3420         return 0;
3421 }
3422 console_initcall(con_init);
3423 
3424 static const struct tty_operations con_ops = {
3425         .install = con_install,
3426         .open = con_open,
3427         .close = con_close,
3428         .write = con_write,
3429         .write_room = con_write_room,
3430         .put_char = con_put_char,
3431         .flush_chars = con_flush_chars,
3432         .chars_in_buffer = con_chars_in_buffer,
3433         .ioctl = vt_ioctl,
3434 #ifdef CONFIG_COMPAT
3435         .compat_ioctl = vt_compat_ioctl,
3436 #endif
3437         .stop = con_stop,
3438         .start = con_start,
3439         .throttle = con_throttle,
3440         .unthrottle = con_unthrottle,
3441         .resize = vt_resize,
3442         .shutdown = con_shutdown,
3443         .cleanup = con_cleanup,
3444 };
3445 
3446 static struct cdev vc0_cdev;
3447 
3448 static ssize_t show_tty_active(struct device *dev,
3449                                 struct device_attribute *attr, char *buf)
3450 {
3451         return sprintf(buf, "tty%d\n", fg_console + 1);
3452 }
3453 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
3454 
3455 static struct attribute *vt_dev_attrs[] = {
3456         &dev_attr_active.attr,
3457         NULL
3458 };
3459 
3460 ATTRIBUTE_GROUPS(vt_dev);
3461 
3462 int __init vty_init(const struct file_operations *console_fops)
3463 {
3464         cdev_init(&vc0_cdev, console_fops);
3465         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
3466             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
3467                 panic("Couldn't register /dev/tty0 driver\n");
3468         tty0dev = device_create_with_groups(tty_class, NULL,
3469                                             MKDEV(TTY_MAJOR, 0), NULL,
3470                                             vt_dev_groups, "tty0");
3471         if (IS_ERR(tty0dev))
3472                 tty0dev = NULL;
3473 
3474         vcs_init();
3475 
3476         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
3477         if (!console_driver)
3478                 panic("Couldn't allocate console driver\n");
3479 
3480         console_driver->name = "tty";
3481         console_driver->name_base = 1;
3482         console_driver->major = TTY_MAJOR;
3483         console_driver->minor_start = 1;
3484         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
3485         console_driver->init_termios = tty_std_termios;
3486         if (default_utf8)
3487                 console_driver->init_termios.c_iflag |= IUTF8;
3488         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
3489         tty_set_operations(console_driver, &con_ops);
3490         if (tty_register_driver(console_driver))
3491                 panic("Couldn't register console driver\n");
3492         kbd_init();
3493         console_map_init();
3494 #ifdef CONFIG_MDA_CONSOLE
3495         mda_console_init();
3496 #endif
3497         return 0;
3498 }
3499 
3500 #ifndef VT_SINGLE_DRIVER
3501 
3502 static struct class *vtconsole_class;
3503 
3504 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3505                            int deflt)
3506 {
3507         struct module *owner = csw->owner;
3508         const char *desc = NULL;
3509         struct con_driver *con_driver;
3510         int i, j = -1, k = -1, retval = -ENODEV;
3511 
3512         if (!try_module_get(owner))
3513                 return -ENODEV;
3514 
3515         WARN_CONSOLE_UNLOCKED();
3516 
3517         /* check if driver is registered */
3518         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3519                 con_driver = &registered_con_driver[i];
3520 
3521                 if (con_driver->con == csw) {
3522                         desc = con_driver->desc;
3523                         retval = 0;
3524                         break;
3525                 }
3526         }
3527 
3528         if (retval)
3529                 goto err;
3530 
3531         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3532                 csw->con_startup();
3533                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3534         }
3535 
3536         if (deflt) {
3537                 if (conswitchp)
3538                         module_put(conswitchp->owner);
3539 
3540                 __module_get(owner);
3541                 conswitchp = csw;
3542         }
3543 
3544         first = max(first, con_driver->first);
3545         last = min(last, con_driver->last);
3546 
3547         for (i = first; i <= last; i++) {
3548                 int old_was_color;
3549                 struct vc_data *vc = vc_cons[i].d;
3550 
3551                 if (con_driver_map[i])
3552                         module_put(con_driver_map[i]->owner);
3553                 __module_get(owner);
3554                 con_driver_map[i] = csw;
3555 
3556                 if (!vc || !vc->vc_sw)
3557                         continue;
3558 
3559                 j = i;
3560 
3561                 if (con_is_visible(vc)) {
3562                         k = i;
3563                         save_screen(vc);
3564                 }
3565 
3566                 old_was_color = vc->vc_can_do_color;
3567                 vc->vc_sw->con_deinit(vc);
3568                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3569                 visual_init(vc, i, 0);
3570                 set_origin(vc);
3571                 update_attr(vc);
3572 
3573                 /* If the console changed between mono <-> color, then
3574                  * the attributes in the screenbuf will be wrong.  The
3575                  * following resets all attributes to something sane.
3576                  */
3577                 if (old_was_color != vc->vc_can_do_color)
3578                         clear_buffer_attributes(vc);
3579         }
3580 
3581         pr_info("Console: switching ");
3582         if (!deflt)
3583                 pr_cont("consoles %d-%d ", first + 1, last + 1);
3584         if (j >= 0) {
3585                 struct vc_data *vc = vc_cons[j].d;
3586 
3587                 pr_cont("to %s %s %dx%d\n",
3588                         vc->vc_can_do_color ? "colour" : "mono",
3589                         desc, vc->vc_cols, vc->vc_rows);
3590 
3591                 if (k >= 0) {
3592                         vc = vc_cons[k].d;
3593                         update_screen(vc);
3594                 }
3595         } else {
3596                 pr_cont("to %s\n", desc);
3597         }
3598 
3599         retval = 0;
3600 err:
3601         module_put(owner);
3602         return retval;
3603 };
3604 
3605 
3606 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3607 /* unlocked version of unbind_con_driver() */
3608 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3609 {
3610         struct module *owner = csw->owner;
3611         const struct consw *defcsw = NULL;
3612         struct con_driver *con_driver = NULL, *con_back = NULL;
3613         int i, retval = -ENODEV;
3614 
3615         if (!try_module_get(owner))
3616                 return -ENODEV;
3617 
3618         WARN_CONSOLE_UNLOCKED();
3619 
3620         /* check if driver is registered and if it is unbindable */
3621         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3622                 con_driver = &registered_con_driver[i];
3623 
3624                 if (con_driver->con == csw &&
3625                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3626                         retval = 0;
3627                         break;
3628                 }
3629         }
3630 
3631         if (retval)
3632                 goto err;
3633 
3634         retval = -ENODEV;
3635 
3636         /* check if backup driver exists */
3637         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3638                 con_back = &registered_con_driver[i];
3639 
3640                 if (con_back->con && con_back->con != csw) {
3641                         defcsw = con_back->con;
3642                         retval = 0;
3643                         break;
3644                 }
3645         }
3646 
3647         if (retval)
3648                 goto err;
3649 
3650         if (!con_is_bound(csw))
3651                 goto err;
3652 
3653         first = max(first, con_driver->first);
3654         last = min(last, con_driver->last);
3655 
3656         for (i = first; i <= last; i++) {
3657                 if (con_driver_map[i] == csw) {
3658                         module_put(csw->owner);
3659                         con_driver_map[i] = NULL;
3660                 }
3661         }
3662 
3663         if (!con_is_bound(defcsw)) {
3664                 const struct consw *defconsw = conswitchp;
3665 
3666                 defcsw->con_startup();
3667                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3668                 /*
3669                  * vgacon may change the default driver to point
3670                  * to dummycon, we restore it here...
3671                  */
3672                 conswitchp = defconsw;
3673         }
3674 
3675         if (!con_is_bound(csw))
3676                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3677 
3678         /* ignore return value, binding should not fail */
3679         do_bind_con_driver(defcsw, first, last, deflt);
3680 err:
3681         module_put(owner);
3682         return retval;
3683 
3684 }
3685 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3686 
3687 static int vt_bind(struct con_driver *con)
3688 {
3689         const struct consw *defcsw = NULL, *csw = NULL;
3690         int i, more = 1, first = -1, last = -1, deflt = 0;
3691 
3692         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3693                 goto err;
3694 
3695         csw = con->con;
3696 
3697         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3698                 struct con_driver *con = &registered_con_driver[i];
3699 
3700                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3701                         defcsw = con->con;
3702                         break;
3703                 }
3704         }
3705 
3706         if (!defcsw)
3707                 goto err;
3708 
3709         while (more) {
3710                 more = 0;
3711 
3712                 for (i = con->first; i <= con->last; i++) {
3713                         if (con_driver_map[i] == defcsw) {
3714                                 if (first == -1)
3715                                         first = i;
3716                                 last = i;
3717                                 more = 1;
3718                         } else if (first != -1)
3719                                 break;
3720                 }
3721 
3722                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3723                         deflt = 1;
3724 
3725                 if (first != -1)
3726                         do_bind_con_driver(csw, first, last, deflt);
3727 
3728                 first = -1;
3729                 last = -1;
3730                 deflt = 0;
3731         }
3732 
3733 err:
3734         return 0;
3735 }
3736 
3737 static int vt_unbind(struct con_driver *con)
3738 {
3739         const struct consw *csw = NULL;
3740         int i, more = 1, first = -1, last = -1, deflt = 0;
3741         int ret;
3742 
3743         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
3744                 goto err;
3745 
3746         csw = con->con;
3747 
3748         while (more) {
3749                 more = 0;
3750 
3751                 for (i = con->first; i <= con->last; i++) {
3752                         if (con_driver_map[i] == csw) {
3753                                 if (first == -1)
3754                                         first = i;
3755                                 last = i;
3756                                 more = 1;
3757                         } else if (first != -1)
3758                                 break;
3759                 }
3760 
3761                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3762                         deflt = 1;
3763 
3764                 if (first != -1) {
3765                         ret = do_unbind_con_driver(csw, first, last, deflt);
3766                         if (ret != 0)
3767                                 return ret;
3768                 }
3769 
3770                 first = -1;
3771                 last = -1;
3772                 deflt = 0;
3773         }
3774 
3775 err:
3776         return 0;
3777 }
3778 #else
3779 static inline int vt_bind(struct con_driver *con)
3780 {
3781         return 0;
3782 }
3783 static inline int vt_unbind(struct con_driver *con)
3784 {
3785         return 0;
3786 }
3787 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3788 
3789 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3790                           const char *buf, size_t count)
3791 {
3792         struct con_driver *con = dev_get_drvdata(dev);
3793         int bind = simple_strtoul(buf, NULL, 0);
3794 
3795         console_lock();
3796 
3797         if (bind)
3798                 vt_bind(con);
3799         else
3800                 vt_unbind(con);
3801 
3802         console_unlock();
3803 
3804         return count;
3805 }
3806 
3807 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3808                          char *buf)
3809 {
3810         struct con_driver *con = dev_get_drvdata(dev);
3811         int bind;
3812 
3813         console_lock();
3814         bind = con_is_bound(con->con);
3815         console_unlock();
3816 
3817         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3818 }
3819 
3820 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3821                          char *buf)
3822 {
3823         struct con_driver *con = dev_get_drvdata(dev);
3824 
3825         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3826                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3827                          con->desc);
3828 
3829 }
3830 
3831 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
3832 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
3833 
3834 static struct attribute *con_dev_attrs[] = {
3835         &dev_attr_bind.attr,
3836         &dev_attr_name.attr,
3837         NULL
3838 };
3839 
3840 ATTRIBUTE_GROUPS(con_dev);
3841 
3842 static int vtconsole_init_device(struct con_driver *con)
3843 {
3844         con->flag |= CON_DRIVER_FLAG_ATTR;
3845         return 0;
3846 }
3847 
3848 static void vtconsole_deinit_device(struct con_driver *con)
3849 {
3850         con->flag &= ~CON_DRIVER_FLAG_ATTR;
3851 }
3852 
3853 /**
3854  * con_is_bound - checks if driver is bound to the console
3855  * @csw: console driver
3856  *
3857  * RETURNS: zero if unbound, nonzero if bound
3858  *
3859  * Drivers can call this and if zero, they should release
3860  * all resources allocated on con_startup()
3861  */
3862 int con_is_bound(const struct consw *csw)
3863 {
3864         int i, bound = 0;
3865 
3866         WARN_CONSOLE_UNLOCKED();
3867 
3868         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3869                 if (con_driver_map[i] == csw) {
3870                         bound = 1;
3871                         break;
3872                 }
3873         }
3874 
3875         return bound;
3876 }
3877 EXPORT_SYMBOL(con_is_bound);
3878 
3879 /**
3880  * con_is_visible - checks whether the current console is visible
3881  * @vc: virtual console
3882  *
3883  * RETURNS: zero if not visible, nonzero if visible
3884  */
3885 bool con_is_visible(const struct vc_data *vc)
3886 {
3887         WARN_CONSOLE_UNLOCKED();
3888 
3889         return *vc->vc_display_fg == vc;
3890 }
3891 EXPORT_SYMBOL(con_is_visible);
3892 
3893 /**
3894  * con_debug_enter - prepare the console for the kernel debugger
3895  * @sw: console driver
3896  *
3897  * Called when the console is taken over by the kernel debugger, this
3898  * function needs to save the current console state, then put the console
3899  * into a state suitable for the kernel debugger.
3900  *
3901  * RETURNS:
3902  * Zero on success, nonzero if a failure occurred when trying to prepare
3903  * the console for the debugger.
3904  */
3905 int con_debug_enter(struct vc_data *vc)
3906 {
3907         int ret = 0;
3908 
3909         saved_fg_console = fg_console;
3910         saved_last_console = last_console;
3911         saved_want_console = want_console;
3912         saved_vc_mode = vc->vc_mode;
3913         saved_console_blanked = console_blanked;
3914         vc->vc_mode = KD_TEXT;
3915         console_blanked = 0;
3916         if (vc->vc_sw->con_debug_enter)
3917                 ret = vc->vc_sw->con_debug_enter(vc);
3918 #ifdef CONFIG_KGDB_KDB
3919         /* Set the initial LINES variable if it is not already set */
3920         if (vc->vc_rows < 999) {
3921                 int linecount;
3922                 char lns[4];
3923                 const char *setargs[3] = {
3924                         "set",
3925                         "LINES",
3926                         lns,
3927                 };
3928                 if (kdbgetintenv(setargs[0], &linecount)) {
3929                         snprintf(lns, 4, "%i", vc->vc_rows);
3930                         kdb_set(2, setargs);
3931                 }
3932         }
3933         if (vc->vc_cols < 999) {
3934                 int colcount;
3935                 char cols[4];
3936                 const char *setargs[3] = {
3937                         "set",
3938                         "COLUMNS",
3939                         cols,
3940                 };
3941                 if (kdbgetintenv(setargs[0], &colcount)) {
3942                         snprintf(cols, 4, "%i", vc->vc_cols);
3943                         kdb_set(2, setargs);
3944                 }
3945         }
3946 #endif /* CONFIG_KGDB_KDB */
3947         return ret;
3948 }
3949 EXPORT_SYMBOL_GPL(con_debug_enter);
3950 
3951 /**
3952  * con_debug_leave - restore console state
3953  * @sw: console driver
3954  *
3955  * Restore the console state to what it was before the kernel debugger
3956  * was invoked.
3957  *
3958  * RETURNS:
3959  * Zero on success, nonzero if a failure occurred when trying to restore
3960  * the console.
3961  */
3962 int con_debug_leave(void)
3963 {
3964         struct vc_data *vc;
3965         int ret = 0;
3966 
3967         fg_console = saved_fg_console;
3968         last_console = saved_last_console;
3969         want_console = saved_want_console;
3970         console_blanked = saved_console_blanked;
3971         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3972 
3973         vc = vc_cons[fg_console].d;
3974         if (vc->vc_sw->con_debug_leave)
3975                 ret = vc->vc_sw->con_debug_leave(vc);
3976         return ret;
3977 }
3978 EXPORT_SYMBOL_GPL(con_debug_leave);
3979 
3980 static int do_register_con_driver(const struct consw *csw, int first, int last)
3981 {
3982         struct module *owner = csw->owner;
3983         struct con_driver *con_driver;
3984         const char *desc;
3985         int i, retval;
3986 
3987         WARN_CONSOLE_UNLOCKED();
3988 
3989         if (!try_module_get(owner))
3990                 return -ENODEV;
3991 
3992         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3993                 con_driver = &registered_con_driver[i];
3994 
3995                 /* already registered */
3996                 if (con_driver->con == csw) {
3997                         retval = -EBUSY;
3998                         goto err;
3999                 }
4000         }
4001 
4002         desc = csw->con_startup();
4003         if (!desc) {
4004                 retval = -ENODEV;
4005                 goto err;
4006         }
4007 
4008         retval = -EINVAL;
4009 
4010         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4011                 con_driver = &registered_con_driver[i];
4012 
4013                 if (con_driver->con == NULL &&
4014                     !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
4015                         con_driver->con = csw;
4016                         con_driver->desc = desc;
4017                         con_driver->node = i;
4018                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
4019                                            CON_DRIVER_FLAG_INIT;
4020                         con_driver->first = first;
4021                         con_driver->last = last;
4022                         retval = 0;
4023                         break;
4024                 }
4025         }
4026 
4027         if (retval)
4028                 goto err;
4029 
4030         con_driver->dev =
4031                 device_create_with_groups(vtconsole_class, NULL,
4032                                           MKDEV(0, con_driver->node),
4033                                           con_driver, con_dev_groups,
4034                                           "vtcon%i", con_driver->node);
4035         if (IS_ERR(con_driver->dev)) {
4036                 pr_warn("Unable to create device for %s; errno = %ld\n",
4037                         con_driver->desc, PTR_ERR(con_driver->dev));
4038                 con_driver->dev = NULL;
4039         } else {
4040                 vtconsole_init_device(con_driver);
4041         }
4042 
4043 err:
4044         module_put(owner);
4045         return retval;
4046 }
4047 
4048 
4049 /**
4050  * do_unregister_con_driver - unregister console driver from console layer
4051  * @csw: console driver
4052  *
4053  * DESCRIPTION: All drivers that registers to the console layer must
4054  * call this function upon exit, or if the console driver is in a state
4055  * where it won't be able to handle console services, such as the
4056  * framebuffer console without loaded framebuffer drivers.
4057  *
4058  * The driver must unbind first prior to unregistration.
4059  */
4060 int do_unregister_con_driver(const struct consw *csw)
4061 {
4062         int i;
4063 
4064         /* cannot unregister a bound driver */
4065         if (con_is_bound(csw))
4066                 return -EBUSY;
4067 
4068         if (csw == conswitchp)
4069                 return -EINVAL;
4070 
4071         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4072                 struct con_driver *con_driver = &registered_con_driver[i];
4073 
4074                 if (con_driver->con == csw) {
4075                         /*
4076                          * Defer the removal of the sysfs entries since that
4077                          * will acquire the kernfs s_active lock and we can't
4078                          * acquire this lock while holding the console lock:
4079                          * the unbind sysfs entry imposes already the opposite
4080                          * order. Reset con already here to prevent any later
4081                          * lookup to succeed and mark this slot as zombie, so
4082                          * it won't get reused until we complete the removal
4083                          * in the deferred work.
4084                          */
4085                         con_driver->con = NULL;
4086                         con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
4087                         schedule_work(&con_driver_unregister_work);
4088 
4089                         return 0;
4090                 }
4091         }
4092 
4093         return -ENODEV;
4094 }
4095 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
4096 
4097 static void con_driver_unregister_callback(struct work_struct *ignored)
4098 {
4099         int i;
4100 
4101         console_lock();
4102 
4103         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4104                 struct con_driver *con_driver = &registered_con_driver[i];
4105 
4106                 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
4107                         continue;
4108 
4109                 console_unlock();
4110 
4111                 vtconsole_deinit_device(con_driver);
4112                 device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
4113 
4114                 console_lock();
4115 
4116                 if (WARN_ON_ONCE(con_driver->con))
4117                         con_driver->con = NULL;
4118                 con_driver->desc = NULL;
4119                 con_driver->dev = NULL;
4120                 con_driver->node = 0;
4121                 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
4122                 con_driver->flag = 0;
4123                 con_driver->first = 0;
4124                 con_driver->last = 0;
4125         }
4126 
4127         console_unlock();
4128 }
4129 
4130 /*
4131  *      If we support more console drivers, this function is used
4132  *      when a driver wants to take over some existing consoles
4133  *      and become default driver for newly opened ones.
4134  *
4135  *      do_take_over_console is basically a register followed by unbind
4136  */
4137 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
4138 {
4139         int err;
4140 
4141         err = do_register_con_driver(csw, first, last);
4142         /*
4143          * If we get an busy error we still want to bind the console driver
4144          * and return success, as we may have unbound the console driver
4145          * but not unregistered it.
4146          */
4147         if (err == -EBUSY)
4148                 err = 0;
4149         if (!err)
4150                 do_bind_con_driver(csw, first, last, deflt);
4151 
4152         return err;
4153 }
4154 EXPORT_SYMBOL_GPL(do_take_over_console);
4155 
4156 
4157 /*
4158  * give_up_console is a wrapper to unregister_con_driver. It will only
4159  * work if driver is fully unbound.
4160  */
4161 void give_up_console(const struct consw *csw)
4162 {
4163         console_lock();
4164         do_unregister_con_driver(csw);
4165         console_unlock();
4166 }
4167 
4168 static int __init vtconsole_class_init(void)
4169 {
4170         int i;
4171 
4172         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
4173         if (IS_ERR(vtconsole_class)) {
4174                 pr_warn("Unable to create vt console class; errno = %ld\n",
4175                         PTR_ERR(vtconsole_class));
4176                 vtconsole_class = NULL;
4177         }
4178 
4179         /* Add system drivers to sysfs */
4180         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
4181                 struct con_driver *con = &registered_con_driver[i];
4182 
4183                 if (con->con && !con->dev) {
4184                         con->dev =
4185                                 device_create_with_groups(vtconsole_class, NULL,
4186                                                           MKDEV(0, con->node),
4187                                                           con, con_dev_groups,
4188                                                           "vtcon%i", con->node);
4189 
4190                         if (IS_ERR(con->dev)) {
4191                                 pr_warn("Unable to create device for %s; errno = %ld\n",
4192                                         con->desc, PTR_ERR(con->dev));
4193                                 con->dev = NULL;
4194                         } else {
4195                                 vtconsole_init_device(con);
4196                         }
4197                 }
4198         }
4199 
4200         return 0;
4201 }
4202 postcore_initcall(vtconsole_class_init);
4203 
4204 #endif
4205 
4206 /*
4207  *      Screen blanking
4208  */
4209 
4210 static int set_vesa_blanking(char __user *p)
4211 {
4212         unsigned int mode;
4213 
4214         if (get_user(mode, p + 1))
4215                 return -EFAULT;
4216 
4217         vesa_blank_mode = (mode < 4) ? mode : 0;
4218         return 0;
4219 }
4220 
4221 void do_blank_screen(int entering_gfx)
4222 {
4223         struct vc_data *vc = vc_cons[fg_console].d;
4224         int i;
4225 
4226         might_sleep();
4227 
4228         WARN_CONSOLE_UNLOCKED();
4229 
4230         if (console_blanked) {
4231                 if (blank_state == blank_vesa_wait) {
4232                         blank_state = blank_off;
4233                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
4234                 }
4235                 return;
4236         }
4237 
4238         /* entering graphics mode? */
4239         if (entering_gfx) {
4240                 hide_cursor(vc);
4241                 save_screen(vc);
4242                 vc->vc_sw->con_blank(vc, -1, 1);
4243                 console_blanked = fg_console + 1;
4244                 blank_state = blank_off;
4245                 set_origin(vc);
4246                 return;
4247         }
4248 
4249         blank_state = blank_off;
4250 
4251         /* don't blank graphics */
4252         if (vc->vc_mode != KD_TEXT) {
4253                 console_blanked = fg_console + 1;
4254                 return;
4255         }
4256 
4257         hide_cursor(vc);
4258         del_timer_sync(&console_timer);
4259         blank_timer_expired = 0;
4260 
4261         save_screen(vc);
4262         /* In case we need to reset origin, blanking hook returns 1 */
4263         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
4264         console_blanked = fg_console + 1;
4265         if (i)
4266                 set_origin(vc);
4267 
4268         if (console_blank_hook && console_blank_hook(1))
4269                 return;
4270 
4271         if (vesa_off_interval && vesa_blank_mode) {
4272                 blank_state = blank_vesa_wait;
4273                 mod_timer(&console_timer, jiffies + vesa_off_interval);
4274         }
4275         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
4276 }
4277 EXPORT_SYMBOL(do_blank_screen);
4278 
4279 /*
4280  * Called by timer as well as from vt_console_driver
4281  */
4282 void do_unblank_screen(int leaving_gfx)
4283 {
4284         struct vc_data *vc;
4285 
4286         /* This should now always be called from a "sane" (read: can schedule)
4287          * context for the sake of the low level drivers, except in the special
4288          * case of oops_in_progress
4289          */
4290         if (!oops_in_progress)
4291                 might_sleep();
4292 
4293         WARN_CONSOLE_UNLOCKED();
4294 
4295         ignore_poke = 0;
4296         if (!console_blanked)
4297                 return;
4298         if (!vc_cons_allocated(fg_console)) {
4299                 /* impossible */
4300                 pr_warn("unblank_screen: tty %d not allocated ??\n",
4301                         fg_console + 1);
4302                 return;
4303         }
4304         vc = vc_cons[fg_console].d;
4305         if (vc->vc_mode != KD_TEXT)
4306                 return; /* but leave console_blanked != 0 */
4307 
4308         if (blankinterval) {
4309                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4310                 blank_state = blank_normal_wait;
4311         }
4312 
4313         console_blanked = 0;
4314         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
4315                 /* Low-level driver cannot restore -> do it ourselves */
4316                 update_screen(vc);
4317         if (console_blank_hook)
4318                 console_blank_hook(0);
4319         set_palette(vc);
4320         set_cursor(vc);
4321         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
4322 }
4323 EXPORT_SYMBOL(do_unblank_screen);
4324 
4325 /*
4326  * This is called by the outside world to cause a forced unblank, mostly for
4327  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
4328  * call it with 1 as an argument and so force a mode restore... that may kill
4329  * X or at least garbage the screen but would also make the Oops visible...
4330  */
4331 void unblank_screen(void)
4332 {
4333         do_unblank_screen(0);
4334 }
4335 
4336 /*
4337  * We defer the timer blanking to work queue so it can take the console mutex
4338  * (console operations can still happen at irq time, but only from printk which
4339  * has the console mutex. Not perfect yet, but better than no locking
4340  */
4341 static void blank_screen_t(struct timer_list *unused)
4342 {
4343         blank_timer_expired = 1;
4344         schedule_work(&console_work);
4345 }
4346 
4347 void poke_blanked_console(void)
4348 {
4349         WARN_CONSOLE_UNLOCKED();
4350 
4351         /* Add this so we quickly catch whoever might call us in a non
4352          * safe context. Nowadays, unblank_screen() isn't to be called in
4353          * atomic contexts and is allowed to schedule (with the special case
4354          * of oops_in_progress, but that isn't of any concern for this
4355          * function. --BenH.
4356          */
4357         might_sleep();
4358 
4359         /* This isn't perfectly race free, but a race here would be mostly harmless,
4360          * at worse, we'll do a spurrious blank and it's unlikely
4361          */
4362         del_timer(&console_timer);
4363         blank_timer_expired = 0;
4364 
4365         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
4366                 return;
4367         if (console_blanked)
4368                 unblank_screen();
4369         else if (blankinterval) {
4370                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
4371                 blank_state = blank_normal_wait;
4372         }
4373 }
4374 
4375 /*
4376  *      Palettes
4377  */
4378 
4379 static void set_palette(struct vc_data *vc)
4380 {
4381         WARN_CONSOLE_UNLOCKED();
4382 
4383         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
4384                 vc->vc_sw->con_set_palette(vc, color_table);
4385 }
4386 
4387 /*
4388  * Load palette into the DAC registers. arg points to a colour
4389  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
4390  */
4391 
4392 int con_set_cmap(unsigned char __user *arg)
4393 {
4394         int i, j, k;
4395         unsigned char colormap[3*16];
4396 
4397         if (copy_from_user(colormap, arg, sizeof(colormap)))
4398                 return -EFAULT;
4399 
4400         console_lock();
4401         for (i = k = 0; i < 16; i++) {
4402                 default_red[i] = colormap[k++];
4403                 default_grn[i] = colormap[k++];
4404                 default_blu[i] = colormap[k++];
4405         }
4406         for (i = 0; i < MAX_NR_CONSOLES; i++) {
4407                 if (!vc_cons_allocated(i))
4408                         continue;
4409                 for (j = k = 0; j < 16; j++) {
4410                         vc_cons[i].d->vc_palette[k++] = default_red[j];
4411                         vc_cons[i].d->vc_palette[k++] = default_grn[j];
4412                         vc_cons[i].d->vc_palette[k++] = default_blu[j];
4413                 }
4414                 set_palette(vc_cons[i].d);
4415         }
4416         console_unlock();
4417 
4418         return 0;
4419 }
4420 
4421 int con_get_cmap(unsigned char __user *arg)
4422 {
4423         int i, k;
4424         unsigned char colormap[3*16];
4425 
4426         console_lock();
4427         for (i = k = 0; i < 16; i++) {
4428                 colormap[k++] = default_red[i];
4429                 colormap[k++] = default_grn[i];
4430                 colormap[k++] = default_blu[i];
4431         }
4432         console_unlock();
4433 
4434         if (copy_to_user(arg, colormap, sizeof(colormap)))
4435                 return -EFAULT;
4436 
4437         return 0;
4438 }
4439 
4440 void reset_palette(struct vc_data *vc)
4441 {
4442         int j, k;
4443         for (j=k=0; j<16; j++) {
4444                 vc->vc_palette[k++] = default_red[j];
4445                 vc->vc_palette[k++] = default_grn[j];
4446                 vc->vc_palette[k++] = default_blu[j];
4447         }
4448         set_palette(vc);
4449 }
4450 
4451 /*
4452  *  Font switching
4453  *
4454  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
4455  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints, 
4456  *  depending on width) reserved for each character which is kinda wasty, but 
4457  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It 
4458  *  is up to the actual low-level console-driver convert data into its favorite
4459  *  format (maybe we should add a `fontoffset' field to the `display'
4460  *  structure so we won't have to convert the fontdata all the time.
4461  *  /Jes
4462  */
4463 
4464 #define max_font_size 65536
4465 
4466 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
4467 {
4468         struct console_font font;
4469         int rc = -EINVAL;
4470         int c;
4471 
4472         if (op->data) {
4473                 font.data = kmalloc(max_font_size, GFP_KERNEL);
4474                 if (!font.data)
4475                         return -ENOMEM;
4476         } else
4477                 font.data = NULL;
4478 
4479         console_lock();
4480         if (vc->vc_mode != KD_TEXT)
4481                 rc = -EINVAL;
4482         else if (vc->vc_sw->con_font_get)
4483                 rc = vc->vc_sw->con_font_get(vc, &font);
4484         else
4485                 rc = -ENOSYS;
4486         console_unlock();
4487 
4488         if (rc)
4489                 goto out;
4490 
4491         c = (font.width+7)/8 * 32 * font.charcount;
4492 
4493         if (op->data && font.charcount > op->charcount)
4494                 rc = -ENOSPC;
4495         if (!(op->flags & KD_FONT_FLAG_OLD)) {
4496                 if (font.width > op->width || font.height > op->height) 
4497                         rc = -ENOSPC;
4498         } else {
4499                 if (font.width != 8)
4500                         rc = -EIO;
4501                 else if ((op->height && font.height > op->height) ||
4502                          font.height > 32)
4503                         rc = -ENOSPC;
4504         }
4505         if (rc)
4506                 goto out;
4507 
4508         op->height = font.height;
4509         op->width = font.width;
4510         op->charcount = font.charcount;
4511 
4512         if (op->data && copy_to_user(op->data, font.data, c))
4513                 rc = -EFAULT;
4514 
4515 out:
4516         kfree(font.data);
4517         return rc;
4518 }
4519 
4520 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4521 {
4522         struct console_font font;
4523         int rc = -EINVAL;
4524         int size;
4525 
4526         if (vc->vc_mode != KD_TEXT)
4527                 return -EINVAL;
4528         if (!op->data)
4529                 return -EINVAL;
4530         if (op->charcount > 512)
4531                 return -EINVAL;
4532         if (op->width <= 0 || op->width > 32 || op->height > 32)
4533                 return -EINVAL;
4534         size = (op->width+7)/8 * 32 * op->charcount;
4535         if (size > max_font_size)
4536                 return -ENOSPC;
4537 
4538         font.data = memdup_user(op->data, size);
4539         if (IS_ERR(font.data))
4540                 return PTR_ERR(font.data);
4541 
4542         if (!op->height) {              /* Need to guess font height [compat] */
4543                 int h, i;
4544                 u8 *charmap = font.data;
4545 
4546                 /*
4547                  * If from KDFONTOP ioctl, don't allow things which can be done
4548                  * in userland,so that we can get rid of this soon
4549                  */
4550                 if (!(op->flags & KD_FONT_FLAG_OLD)) {
4551                         kfree(font.data);
4552                         return -EINVAL;
4553                 }
4554 
4555                 for (h = 32; h > 0; h--)
4556                         for (i = 0; i < op->charcount; i++)
4557                                 if (charmap[32*i+h-1])
4558                                         goto nonzero;
4559 
4560                 kfree(font.data);
4561                 return -EINVAL;
4562 
4563         nonzero:
4564                 op->height = h;
4565         }
4566 
4567         font.charcount = op->charcount;
4568         font.width = op->width;
4569         font.height = op->height;
4570 
4571         console_lock();
4572         if (vc->vc_mode != KD_TEXT)
4573                 rc = -EINVAL;
4574         else if (vc->vc_sw->con_font_set)
4575                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4576         else
4577                 rc = -ENOSYS;
4578         console_unlock();
4579         kfree(font.data);
4580         return rc;
4581 }
4582 
4583 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4584 {
4585         struct console_font font = {.width = op->width, .height = op->height};
4586         char name[MAX_FONT_NAME];
4587         char *s = name;
4588         int rc;
4589 
4590 
4591         if (!op->data)
4592                 s = NULL;
4593         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4594                 return -EFAULT;
4595         else
4596                 name[MAX_FONT_NAME - 1] = 0;
4597 
4598         console_lock();
4599         if (vc->vc_mode != KD_TEXT) {
4600                 console_unlock();
4601                 return -EINVAL;
4602         }
4603         if (vc->vc_sw->con_font_default)
4604                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4605         else
4606                 rc = -ENOSYS;
4607         console_unlock();
4608         if (!rc) {
4609                 op->width = font.width;
4610                 op->height = font.height;
4611         }
4612         return rc;
4613 }
4614 
4615 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4616 {
4617         int con = op->height;
4618         int rc;
4619 
4620 
4621         console_lock();
4622         if (vc->vc_mode != KD_TEXT)
4623                 rc = -EINVAL;
4624         else if (!vc->vc_sw->con_font_copy)
4625                 rc = -ENOSYS;
4626         else if (con < 0 || !vc_cons_allocated(con))
4627                 rc = -ENOTTY;
4628         else if (con == vc->vc_num)     /* nothing to do */
4629                 rc = 0;
4630         else
4631                 rc = vc->vc_sw->con_font_copy(vc, con);
4632         console_unlock();
4633         return rc;
4634 }
4635 
4636 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4637 {
4638         switch (op->op) {
4639         case KD_FONT_OP_SET:
4640                 return con_font_set(vc, op);
4641         case KD_FONT_OP_GET:
4642                 return con_font_get(vc, op);
4643         case KD_FONT_OP_SET_DEFAULT:
4644                 return con_font_default(vc, op);
4645         case KD_FONT_OP_COPY:
4646                 return con_font_copy(vc, op);
4647         }
4648         return -ENOSYS;
4649 }
4650 
4651 /*
4652  *      Interface exported to selection and vcs.
4653  */
4654 
4655 /* used by selection */
4656 u16 screen_glyph(struct vc_data *vc, int offset)
4657 {
4658         u16 w = scr_readw(screenpos(vc, offset, 1));
4659         u16 c = w & 0xff;
4660 
4661         if (w & vc->vc_hi_font_mask)
4662                 c |= 0x100;
4663         return c;
4664 }
4665 EXPORT_SYMBOL_GPL(screen_glyph);
4666 
4667 u32 screen_glyph_unicode(struct vc_data *vc, int n)
4668 {
4669         struct uni_screen *uniscr = get_vc_uniscr(vc);
4670 
4671         if (uniscr)
4672                 return uniscr->lines[n / vc->vc_cols][n % vc->vc_cols];
4673         return inverse_translate(vc, screen_glyph(vc, n * 2), 1);
4674 }
4675 EXPORT_SYMBOL_GPL(screen_glyph_unicode);
4676 
4677 /* used by vcs - note the word offset */
4678 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4679 {
4680         return screenpos(vc, 2 * w_offset, viewed);
4681 }
4682 EXPORT_SYMBOL_GPL(screen_pos);
4683 
4684 void getconsxy(struct vc_data *vc, unsigned char *p)
4685 {
4686         /* clamp values if they don't fit */
4687         p[0] = min(vc->vc_x, 0xFFu);
4688         p[1] = min(vc->vc_y, 0xFFu);
4689 }
4690 
4691 void putconsxy(struct vc_data *vc, unsigned char *p)
4692 {
4693         hide_cursor(vc);
4694         gotoxy(vc, p[0], p[1]);
4695         set_cursor(vc);
4696 }
4697 
4698 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4699 {
4700         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4701                 return softcursor_original;
4702         return scr_readw(org);
4703 }
4704 
4705 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4706 {
4707         scr_writew(val, org);
4708         if ((unsigned long)org == vc->vc_pos) {
4709                 softcursor_original = -1;
4710                 add_softcursor(vc);
4711         }
4712 }
4713 
4714 void vcs_scr_updated(struct vc_data *vc)
4715 {
4716         notify_update(vc);
4717 }
4718 
4719 void vc_scrolldelta_helper(struct vc_data *c, int lines,
4720                 unsigned int rolled_over, void *base, unsigned int size)
4721 {
4722         unsigned long ubase = (unsigned long)base;
4723         ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
4724         ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
4725         ptrdiff_t origin = (void *)c->vc_origin - base;
4726         int margin = c->vc_size_row * 4;
4727         int from, wrap, from_off, avail;
4728 
4729         /* Turn scrollback off */
4730         if (!lines) {
4731                 c->vc_visible_origin = c->vc_origin;
4732                 return;
4733         }
4734 
4735         /* Do we have already enough to allow jumping from 0 to the end? */
4736         if (rolled_over > scr_end + margin) {
4737                 from = scr_end;
4738                 wrap = rolled_over + c->vc_size_row;
4739         } else {
4740                 from = 0;
4741                 wrap = size;
4742         }
4743 
4744         from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
4745         avail = (origin - from + wrap) % wrap;
4746 
4747         /* Only a little piece would be left? Show all incl. the piece! */
4748         if (avail < 2 * margin)
4749                 margin = 0;
4750         if (from_off < margin)
4751                 from_off = 0;
4752         if (from_off > avail - margin)
4753                 from_off = avail;
4754 
4755         c->vc_visible_origin = ubase + (from + from_off) % wrap;
4756 }
4757 EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
4758 
4759 /*
4760  *      Visible symbols for modules
4761  */
4762 
4763 EXPORT_SYMBOL(color_table);
4764 EXPORT_SYMBOL(default_red);
4765 EXPORT_SYMBOL(default_grn);
4766 EXPORT_SYMBOL(default_blu);
4767 EXPORT_SYMBOL(update_region);
4768 EXPORT_SYMBOL(redraw_screen);
4769 EXPORT_SYMBOL(vc_resize);
4770 EXPORT_SYMBOL(fg_console);
4771 EXPORT_SYMBOL(console_blank_hook);
4772 EXPORT_SYMBOL(console_blanked);
4773 EXPORT_SYMBOL(vc_cons);
4774 EXPORT_SYMBOL(global_cursor_default);
4775 #ifndef VT_SINGLE_DRIVER
4776 EXPORT_SYMBOL(give_up_console);
4777 #endif