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/major.h> 85 #include <linux/mm.h> 86 #include <linux/console.h> 87 #include <linux/init.h> 88 #include <linux/mutex.h> 89 #include <linux/vt_kern.h> 90 #include <linux/selection.h> 91 #include <linux/tiocl.h> 92 #include <linux/kbd_kern.h> 93 #include <linux/consolemap.h> 94 #include <linux/timer.h> 95 #include <linux/interrupt.h> 96 #include <linux/workqueue.h> 97 #include <linux/pm.h> 98 #include <linux/font.h> 99 #include <linux/bitops.h> 100 #include <linux/notifier.h> 101 #include <linux/device.h> 102 #include <linux/io.h> 103 #include <linux/uaccess.h> 104 #include <linux/kdb.h> 105 #include <linux/ctype.h> 106 #include <linux/bsearch.h> 107 108 #define MAX_NR_CON_DRIVER 16 109 110 #define CON_DRIVER_FLAG_MODULE 1 111 #define CON_DRIVER_FLAG_INIT 2 112 #define CON_DRIVER_FLAG_ATTR 4 113 #define CON_DRIVER_FLAG_ZOMBIE 8 114 115 struct con_driver { 116 const struct consw *con; 117 const char *desc; 118 struct device *dev; 119 int node; 120 int first; 121 int last; 122 int flag; 123 }; 124 125 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER]; 126 const struct consw *conswitchp; 127 128 /* A bitmap for codes <32. A bit of 1 indicates that the code 129 * corresponding to that bit number invokes some special action 130 * (such as cursor movement) and should not be displayed as a 131 * glyph unless the disp_ctrl mode is explicitly enabled. 132 */ 133 #define CTRL_ACTION 0x0d00ff81 134 #define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */ 135 136 /* 137 * Here is the default bell parameters: 750HZ, 1/8th of a second 138 */ 139 #define DEFAULT_BELL_PITCH 750 140 #define DEFAULT_BELL_DURATION (HZ/8) 141 #define DEFAULT_CURSOR_BLINK_MS 200 142 143 struct vc vc_cons [MAX_NR_CONSOLES]; 144 145 #ifndef VT_SINGLE_DRIVER 146 static const struct consw *con_driver_map[MAX_NR_CONSOLES]; 147 #endif 148 149 static int con_open(struct tty_struct *, struct file *); 150 static void vc_init(struct vc_data *vc, unsigned int rows, 151 unsigned int cols, int do_clear); 152 static void gotoxy(struct vc_data *vc, int new_x, int new_y); 153 static void save_cur(struct vc_data *vc); 154 static void reset_terminal(struct vc_data *vc, int do_clear); 155 static void con_flush_chars(struct tty_struct *tty); 156 static int set_vesa_blanking(char __user *p); 157 static void set_cursor(struct vc_data *vc); 158 static void hide_cursor(struct vc_data *vc); 159 static void console_callback(struct work_struct *ignored); 160 static void con_driver_unregister_callback(struct work_struct *ignored); 161 static void blank_screen_t(struct timer_list *unused); 162 static void set_palette(struct vc_data *vc); 163 164 #define vt_get_kmsg_redirect() vt_kmsg_redirect(-1) 165 166 static int printable; /* Is console ready for printing? */ 167 int default_utf8 = true; 168 module_param(default_utf8, int, S_IRUGO | S_IWUSR); 169 int global_cursor_default = -1; 170 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR); 171 172 static int cur_default = CUR_DEFAULT; 173 module_param(cur_default, int, S_IRUGO | S_IWUSR); 174 175 /* 176 * ignore_poke: don't unblank the screen when things are typed. This is 177 * mainly for the privacy of braille terminal users. 178 */ 179 static int ignore_poke; 180 181 int do_poke_blanked_console; 182 int console_blanked; 183 184 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */ 185 static int vesa_off_interval; 186 static int blankinterval; 187 core_param(consoleblank, blankinterval, int, 0444); 188 189 static DECLARE_WORK(console_work, console_callback); 190 static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback); 191 192 /* 193 * fg_console is the current virtual console, 194 * last_console is the last used one, 195 * want_console is the console we want to switch to, 196 * saved_* variants are for save/restore around kernel debugger enter/leave 197 */ 198 int fg_console; 199 int last_console; 200 int want_console = -1; 201 static int saved_fg_console; 202 static int saved_last_console; 203 static int saved_want_console; 204 static int saved_vc_mode; 205 static int saved_console_blanked; 206 207 /* 208 * For each existing display, we have a pointer to console currently visible 209 * on that display, allowing consoles other than fg_console to be refreshed 210 * appropriately. Unless the low-level driver supplies its own display_fg 211 * variable, we use this one for the "master display". 212 */ 213 static struct vc_data *master_display_fg; 214 215 /* 216 * Unfortunately, we need to delay tty echo when we're currently writing to the 217 * console since the code is (and always was) not re-entrant, so we schedule 218 * all flip requests to process context with schedule-task() and run it from 219 * console_callback(). 220 */ 221 222 /* 223 * For the same reason, we defer scrollback to the console callback. 224 */ 225 static int scrollback_delta; 226 227 /* 228 * Hook so that the power management routines can (un)blank 229 * the console on our behalf. 230 */ 231 int (*console_blank_hook)(int); 232 233 static DEFINE_TIMER(console_timer, blank_screen_t); 234 static int blank_state; 235 static int blank_timer_expired; 236 enum { 237 blank_off = 0, 238 blank_normal_wait, 239 blank_vesa_wait, 240 }; 241 242 /* 243 * /sys/class/tty/tty0/ 244 * 245 * the attribute 'active' contains the name of the current vc 246 * console and it supports poll() to detect vc switches 247 */ 248 static struct device *tty0dev; 249 250 /* 251 * Notifier list for console events. 252 */ 253 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list); 254 255 int register_vt_notifier(struct notifier_block *nb) 256 { 257 return atomic_notifier_chain_register(&vt_notifier_list, nb); 258 } 259 EXPORT_SYMBOL_GPL(register_vt_notifier); 260 261 int unregister_vt_notifier(struct notifier_block *nb) 262 { 263 return atomic_notifier_chain_unregister(&vt_notifier_list, nb); 264 } 265 EXPORT_SYMBOL_GPL(unregister_vt_notifier); 266 267 static void notify_write(struct vc_data *vc, unsigned int unicode) 268 { 269 struct vt_notifier_param param = { .vc = vc, .c = unicode }; 270 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, ¶m); 271 } 272 273 static void notify_update(struct vc_data *vc) 274 { 275 struct vt_notifier_param param = { .vc = vc }; 276 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, ¶m); 277 } 278 /* 279 * Low-Level Functions 280 */ 281 282 static inline bool con_is_fg(const struct vc_data *vc) 283 { 284 return vc->vc_num == fg_console; 285 } 286 287 static inline bool con_should_update(const struct vc_data *vc) 288 { 289 return con_is_visible(vc) && !console_blanked; 290 } 291 292 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed) 293 { 294 unsigned short *p; 295 296 if (!viewed) 297 p = (unsigned short *)(vc->vc_origin + offset); 298 else if (!vc->vc_sw->con_screen_pos) 299 p = (unsigned short *)(vc->vc_visible_origin + offset); 300 else 301 p = vc->vc_sw->con_screen_pos(vc, offset); 302 return p; 303 } 304 305 /* Called from the keyboard irq path.. */ 306 static inline void scrolldelta(int lines) 307 { 308 /* FIXME */ 309 /* scrolldelta needs some kind of consistency lock, but the BKL was 310 and still is not protecting versus the scheduled back end */ 311 scrollback_delta += lines; 312 schedule_console_callback(); 313 } 314 315 void schedule_console_callback(void) 316 { 317 schedule_work(&console_work); 318 } 319 320 static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b, 321 enum con_scroll dir, unsigned int nr) 322 { 323 u16 *clear, *d, *s; 324 325 if (t + nr >= b) 326 nr = b - t - 1; 327 if (b > vc->vc_rows || t >= b || nr < 1) 328 return; 329 if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr)) 330 return; 331 332 s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t); 333 d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr)); 334 335 if (dir == SM_UP) { 336 clear = s + (b - t - nr) * vc->vc_cols; 337 swap(s, d); 338 } 339 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row); 340 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr); 341 } 342 343 static void do_update_region(struct vc_data *vc, unsigned long start, int count) 344 { 345 unsigned int xx, yy, offset; 346 u16 *p; 347 348 p = (u16 *) start; 349 if (!vc->vc_sw->con_getxy) { 350 offset = (start - vc->vc_origin) / 2; 351 xx = offset % vc->vc_cols; 352 yy = offset / vc->vc_cols; 353 } else { 354 int nxx, nyy; 355 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy); 356 xx = nxx; yy = nyy; 357 } 358 for(;;) { 359 u16 attrib = scr_readw(p) & 0xff00; 360 int startx = xx; 361 u16 *q = p; 362 while (xx < vc->vc_cols && count) { 363 if (attrib != (scr_readw(p) & 0xff00)) { 364 if (p > q) 365 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx); 366 startx = xx; 367 q = p; 368 attrib = scr_readw(p) & 0xff00; 369 } 370 p++; 371 xx++; 372 count--; 373 } 374 if (p > q) 375 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx); 376 if (!count) 377 break; 378 xx = 0; 379 yy++; 380 if (vc->vc_sw->con_getxy) { 381 p = (u16 *)start; 382 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL); 383 } 384 } 385 } 386 387 void update_region(struct vc_data *vc, unsigned long start, int count) 388 { 389 WARN_CONSOLE_UNLOCKED(); 390 391 if (con_should_update(vc)) { 392 hide_cursor(vc); 393 do_update_region(vc, start, count); 394 set_cursor(vc); 395 } 396 } 397 398 /* Structure of attributes is hardware-dependent */ 399 400 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink, 401 u8 _underline, u8 _reverse, u8 _italic) 402 { 403 if (vc->vc_sw->con_build_attr) 404 return vc->vc_sw->con_build_attr(vc, _color, _intensity, 405 _blink, _underline, _reverse, _italic); 406 407 /* 408 * ++roman: I completely changed the attribute format for monochrome 409 * mode (!can_do_color). The formerly used MDA (monochrome display 410 * adapter) format didn't allow the combination of certain effects. 411 * Now the attribute is just a bit vector: 412 * Bit 0..1: intensity (0..2) 413 * Bit 2 : underline 414 * Bit 3 : reverse 415 * Bit 7 : blink 416 */ 417 { 418 u8 a = _color; 419 if (!vc->vc_can_do_color) 420 return _intensity | 421 (_italic ? 2 : 0) | 422 (_underline ? 4 : 0) | 423 (_reverse ? 8 : 0) | 424 (_blink ? 0x80 : 0); 425 if (_italic) 426 a = (a & 0xF0) | vc->vc_itcolor; 427 else if (_underline) 428 a = (a & 0xf0) | vc->vc_ulcolor; 429 else if (_intensity == 0) 430 a = (a & 0xf0) | vc->vc_halfcolor; 431 if (_reverse) 432 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77); 433 if (_blink) 434 a ^= 0x80; 435 if (_intensity == 2) 436 a ^= 0x08; 437 if (vc->vc_hi_font_mask == 0x100) 438 a <<= 1; 439 return a; 440 } 441 } 442 443 static void update_attr(struct vc_data *vc) 444 { 445 vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity, 446 vc->vc_blink, vc->vc_underline, 447 vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic); 448 vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' '; 449 } 450 451 /* Note: inverting the screen twice should revert to the original state */ 452 void invert_screen(struct vc_data *vc, int offset, int count, int viewed) 453 { 454 unsigned short *p; 455 456 WARN_CONSOLE_UNLOCKED(); 457 458 count /= 2; 459 p = screenpos(vc, offset, viewed); 460 if (vc->vc_sw->con_invert_region) { 461 vc->vc_sw->con_invert_region(vc, p, count); 462 } else { 463 u16 *q = p; 464 int cnt = count; 465 u16 a; 466 467 if (!vc->vc_can_do_color) { 468 while (cnt--) { 469 a = scr_readw(q); 470 a ^= 0x0800; 471 scr_writew(a, q); 472 q++; 473 } 474 } else if (vc->vc_hi_font_mask == 0x100) { 475 while (cnt--) { 476 a = scr_readw(q); 477 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4); 478 scr_writew(a, q); 479 q++; 480 } 481 } else { 482 while (cnt--) { 483 a = scr_readw(q); 484 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4); 485 scr_writew(a, q); 486 q++; 487 } 488 } 489 } 490 491 if (con_should_update(vc)) 492 do_update_region(vc, (unsigned long) p, count); 493 notify_update(vc); 494 } 495 496 /* used by selection: complement pointer position */ 497 void complement_pos(struct vc_data *vc, int offset) 498 { 499 static int old_offset = -1; 500 static unsigned short old; 501 static unsigned short oldx, oldy; 502 503 WARN_CONSOLE_UNLOCKED(); 504 505 if (old_offset != -1 && old_offset >= 0 && 506 old_offset < vc->vc_screenbuf_size) { 507 scr_writew(old, screenpos(vc, old_offset, 1)); 508 if (con_should_update(vc)) 509 vc->vc_sw->con_putc(vc, old, oldy, oldx); 510 notify_update(vc); 511 } 512 513 old_offset = offset; 514 515 if (offset != -1 && offset >= 0 && 516 offset < vc->vc_screenbuf_size) { 517 unsigned short new; 518 unsigned short *p; 519 p = screenpos(vc, offset, 1); 520 old = scr_readw(p); 521 new = old ^ vc->vc_complement_mask; 522 scr_writew(new, p); 523 if (con_should_update(vc)) { 524 oldx = (offset >> 1) % vc->vc_cols; 525 oldy = (offset >> 1) / vc->vc_cols; 526 vc->vc_sw->con_putc(vc, new, oldy, oldx); 527 } 528 notify_update(vc); 529 } 530 } 531 532 static void insert_char(struct vc_data *vc, unsigned int nr) 533 { 534 unsigned short *p = (unsigned short *) vc->vc_pos; 535 536 scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2); 537 scr_memsetw(p, vc->vc_video_erase_char, nr * 2); 538 vc->vc_need_wrap = 0; 539 if (con_should_update(vc)) 540 do_update_region(vc, (unsigned long) p, 541 vc->vc_cols - vc->vc_x); 542 } 543 544 static void delete_char(struct vc_data *vc, unsigned int nr) 545 { 546 unsigned short *p = (unsigned short *) vc->vc_pos; 547 548 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2); 549 scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char, 550 nr * 2); 551 vc->vc_need_wrap = 0; 552 if (con_should_update(vc)) 553 do_update_region(vc, (unsigned long) p, 554 vc->vc_cols - vc->vc_x); 555 } 556 557 static int softcursor_original = -1; 558 559 static void add_softcursor(struct vc_data *vc) 560 { 561 int i = scr_readw((u16 *) vc->vc_pos); 562 u32 type = vc->vc_cursor_type; 563 564 if (! (type & 0x10)) return; 565 if (softcursor_original != -1) return; 566 softcursor_original = i; 567 i |= ((type >> 8) & 0xff00 ); 568 i ^= ((type) & 0xff00 ); 569 if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000; 570 if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700; 571 scr_writew(i, (u16 *) vc->vc_pos); 572 if (con_should_update(vc)) 573 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x); 574 } 575 576 static void hide_softcursor(struct vc_data *vc) 577 { 578 if (softcursor_original != -1) { 579 scr_writew(softcursor_original, (u16 *)vc->vc_pos); 580 if (con_should_update(vc)) 581 vc->vc_sw->con_putc(vc, softcursor_original, 582 vc->vc_y, vc->vc_x); 583 softcursor_original = -1; 584 } 585 } 586 587 static void hide_cursor(struct vc_data *vc) 588 { 589 if (vc == sel_cons) 590 clear_selection(); 591 vc->vc_sw->con_cursor(vc, CM_ERASE); 592 hide_softcursor(vc); 593 } 594 595 static void set_cursor(struct vc_data *vc) 596 { 597 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS) 598 return; 599 if (vc->vc_deccm) { 600 if (vc == sel_cons) 601 clear_selection(); 602 add_softcursor(vc); 603 if ((vc->vc_cursor_type & 0x0f) != 1) 604 vc->vc_sw->con_cursor(vc, CM_DRAW); 605 } else 606 hide_cursor(vc); 607 } 608 609 static void set_origin(struct vc_data *vc) 610 { 611 WARN_CONSOLE_UNLOCKED(); 612 613 if (!con_is_visible(vc) || 614 !vc->vc_sw->con_set_origin || 615 !vc->vc_sw->con_set_origin(vc)) 616 vc->vc_origin = (unsigned long)vc->vc_screenbuf; 617 vc->vc_visible_origin = vc->vc_origin; 618 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size; 619 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x; 620 } 621 622 static void save_screen(struct vc_data *vc) 623 { 624 WARN_CONSOLE_UNLOCKED(); 625 626 if (vc->vc_sw->con_save_screen) 627 vc->vc_sw->con_save_screen(vc); 628 } 629 630 static void flush_scrollback(struct vc_data *vc) 631 { 632 WARN_CONSOLE_UNLOCKED(); 633 634 if (vc->vc_sw->con_flush_scrollback) 635 vc->vc_sw->con_flush_scrollback(vc); 636 } 637 638 /* 639 * Redrawing of screen 640 */ 641 642 void clear_buffer_attributes(struct vc_data *vc) 643 { 644 unsigned short *p = (unsigned short *)vc->vc_origin; 645 int count = vc->vc_screenbuf_size / 2; 646 int mask = vc->vc_hi_font_mask | 0xff; 647 648 for (; count > 0; count--, p++) { 649 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p); 650 } 651 } 652 653 void redraw_screen(struct vc_data *vc, int is_switch) 654 { 655 int redraw = 0; 656 657 WARN_CONSOLE_UNLOCKED(); 658 659 if (!vc) { 660 /* strange ... */ 661 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */ 662 return; 663 } 664 665 if (is_switch) { 666 struct vc_data *old_vc = vc_cons[fg_console].d; 667 if (old_vc == vc) 668 return; 669 if (!con_is_visible(vc)) 670 redraw = 1; 671 *vc->vc_display_fg = vc; 672 fg_console = vc->vc_num; 673 hide_cursor(old_vc); 674 if (!con_is_visible(old_vc)) { 675 save_screen(old_vc); 676 set_origin(old_vc); 677 } 678 if (tty0dev) 679 sysfs_notify(&tty0dev->kobj, NULL, "active"); 680 } else { 681 hide_cursor(vc); 682 redraw = 1; 683 } 684 685 if (redraw) { 686 int update; 687 int old_was_color = vc->vc_can_do_color; 688 689 set_origin(vc); 690 update = vc->vc_sw->con_switch(vc); 691 set_palette(vc); 692 /* 693 * If console changed from mono<->color, the best we can do 694 * is to clear the buffer attributes. As it currently stands, 695 * rebuilding new attributes from the old buffer is not doable 696 * without overly complex code. 697 */ 698 if (old_was_color != vc->vc_can_do_color) { 699 update_attr(vc); 700 clear_buffer_attributes(vc); 701 } 702 703 /* Forcibly update if we're panicing */ 704 if ((update && vc->vc_mode != KD_GRAPHICS) || 705 vt_force_oops_output(vc)) 706 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2); 707 } 708 set_cursor(vc); 709 if (is_switch) { 710 set_leds(); 711 compute_shiftstate(); 712 notify_update(vc); 713 } 714 } 715 716 /* 717 * Allocation, freeing and resizing of VTs. 718 */ 719 720 int vc_cons_allocated(unsigned int i) 721 { 722 return (i < MAX_NR_CONSOLES && vc_cons[i].d); 723 } 724 725 static void visual_init(struct vc_data *vc, int num, int init) 726 { 727 /* ++Geert: vc->vc_sw->con_init determines console size */ 728 if (vc->vc_sw) 729 module_put(vc->vc_sw->owner); 730 vc->vc_sw = conswitchp; 731 #ifndef VT_SINGLE_DRIVER 732 if (con_driver_map[num]) 733 vc->vc_sw = con_driver_map[num]; 734 #endif 735 __module_get(vc->vc_sw->owner); 736 vc->vc_num = num; 737 vc->vc_display_fg = &master_display_fg; 738 if (vc->vc_uni_pagedir_loc) 739 con_free_unimap(vc); 740 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir; 741 vc->vc_uni_pagedir = NULL; 742 vc->vc_hi_font_mask = 0; 743 vc->vc_complement_mask = 0; 744 vc->vc_can_do_color = 0; 745 vc->vc_panic_force_write = false; 746 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS; 747 vc->vc_sw->con_init(vc, init); 748 if (!vc->vc_complement_mask) 749 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800; 750 vc->vc_s_complement_mask = vc->vc_complement_mask; 751 vc->vc_size_row = vc->vc_cols << 1; 752 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row; 753 } 754 755 int vc_allocate(unsigned int currcons) /* return 0 on success */ 756 { 757 struct vt_notifier_param param; 758 struct vc_data *vc; 759 760 WARN_CONSOLE_UNLOCKED(); 761 762 if (currcons >= MAX_NR_CONSOLES) 763 return -ENXIO; 764 765 if (vc_cons[currcons].d) 766 return 0; 767 768 /* due to the granularity of kmalloc, we waste some memory here */ 769 /* the alloc is done in two steps, to optimize the common situation 770 of a 25x80 console (structsize=216, screenbuf_size=4000) */ 771 /* although the numbers above are not valid since long ago, the 772 point is still up-to-date and the comment still has its value 773 even if only as a historical artifact. --mj, July 1998 */ 774 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL); 775 if (!vc) 776 return -ENOMEM; 777 778 vc_cons[currcons].d = vc; 779 tty_port_init(&vc->port); 780 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK); 781 782 visual_init(vc, currcons, 1); 783 784 if (!*vc->vc_uni_pagedir_loc) 785 con_set_default_unimap(vc); 786 787 vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL); 788 if (!vc->vc_screenbuf) 789 goto err_free; 790 791 /* If no drivers have overridden us and the user didn't pass a 792 boot option, default to displaying the cursor */ 793 if (global_cursor_default == -1) 794 global_cursor_default = 1; 795 796 vc_init(vc, vc->vc_rows, vc->vc_cols, 1); 797 vcs_make_sysfs(currcons); 798 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, ¶m); 799 800 return 0; 801 err_free: 802 kfree(vc); 803 vc_cons[currcons].d = NULL; 804 return -ENOMEM; 805 } 806 807 static inline int resize_screen(struct vc_data *vc, int width, int height, 808 int user) 809 { 810 /* Resizes the resolution of the display adapater */ 811 int err = 0; 812 813 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize) 814 err = vc->vc_sw->con_resize(vc, width, height, user); 815 816 return err; 817 } 818 819 /* 820 * Change # of rows and columns (0 means unchanged/the size of fg_console) 821 * [this is to be used together with some user program 822 * like resize that changes the hardware videomode] 823 */ 824 #define VC_RESIZE_MAXCOL (32767) 825 #define VC_RESIZE_MAXROW (32767) 826 827 /** 828 * vc_do_resize - resizing method for the tty 829 * @tty: tty being resized 830 * @real_tty: real tty (different to tty if a pty/tty pair) 831 * @vc: virtual console private data 832 * @cols: columns 833 * @lines: lines 834 * 835 * Resize a virtual console, clipping according to the actual constraints. 836 * If the caller passes a tty structure then update the termios winsize 837 * information and perform any necessary signal handling. 838 * 839 * Caller must hold the console semaphore. Takes the termios rwsem and 840 * ctrl_lock of the tty IFF a tty is passed. 841 */ 842 843 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc, 844 unsigned int cols, unsigned int lines) 845 { 846 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0; 847 unsigned long end; 848 unsigned int old_rows, old_row_size; 849 unsigned int new_cols, new_rows, new_row_size, new_screen_size; 850 unsigned int user; 851 unsigned short *newscreen; 852 853 WARN_CONSOLE_UNLOCKED(); 854 855 if (!vc) 856 return -ENXIO; 857 858 user = vc->vc_resize_user; 859 vc->vc_resize_user = 0; 860 861 if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW) 862 return -EINVAL; 863 864 new_cols = (cols ? cols : vc->vc_cols); 865 new_rows = (lines ? lines : vc->vc_rows); 866 new_row_size = new_cols << 1; 867 new_screen_size = new_row_size * new_rows; 868 869 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows) 870 return 0; 871 872 if (new_screen_size > (4 << 20)) 873 return -EINVAL; 874 newscreen = kmalloc(new_screen_size, GFP_USER); 875 if (!newscreen) 876 return -ENOMEM; 877 878 if (vc == sel_cons) 879 clear_selection(); 880 881 old_rows = vc->vc_rows; 882 old_row_size = vc->vc_size_row; 883 884 err = resize_screen(vc, new_cols, new_rows, user); 885 if (err) { 886 kfree(newscreen); 887 return err; 888 } 889 890 vc->vc_rows = new_rows; 891 vc->vc_cols = new_cols; 892 vc->vc_size_row = new_row_size; 893 vc->vc_screenbuf_size = new_screen_size; 894 895 rlth = min(old_row_size, new_row_size); 896 rrem = new_row_size - rlth; 897 old_origin = vc->vc_origin; 898 new_origin = (long) newscreen; 899 new_scr_end = new_origin + new_screen_size; 900 901 if (vc->vc_y > new_rows) { 902 if (old_rows - vc->vc_y < new_rows) { 903 /* 904 * Cursor near the bottom, copy contents from the 905 * bottom of buffer 906 */ 907 old_origin += (old_rows - new_rows) * old_row_size; 908 } else { 909 /* 910 * Cursor is in no man's land, copy 1/2 screenful 911 * from the top and bottom of cursor position 912 */ 913 old_origin += (vc->vc_y - new_rows/2) * old_row_size; 914 } 915 } 916 917 end = old_origin + old_row_size * min(old_rows, new_rows); 918 919 update_attr(vc); 920 921 while (old_origin < end) { 922 scr_memcpyw((unsigned short *) new_origin, 923 (unsigned short *) old_origin, rlth); 924 if (rrem) 925 scr_memsetw((void *)(new_origin + rlth), 926 vc->vc_video_erase_char, rrem); 927 old_origin += old_row_size; 928 new_origin += new_row_size; 929 } 930 if (new_scr_end > new_origin) 931 scr_memsetw((void *)new_origin, vc->vc_video_erase_char, 932 new_scr_end - new_origin); 933 kfree(vc->vc_screenbuf); 934 vc->vc_screenbuf = newscreen; 935 vc->vc_screenbuf_size = new_screen_size; 936 set_origin(vc); 937 938 /* do part of a reset_terminal() */ 939 vc->vc_top = 0; 940 vc->vc_bottom = vc->vc_rows; 941 gotoxy(vc, vc->vc_x, vc->vc_y); 942 save_cur(vc); 943 944 if (tty) { 945 /* Rewrite the requested winsize data with the actual 946 resulting sizes */ 947 struct winsize ws; 948 memset(&ws, 0, sizeof(ws)); 949 ws.ws_row = vc->vc_rows; 950 ws.ws_col = vc->vc_cols; 951 ws.ws_ypixel = vc->vc_scan_lines; 952 tty_do_resize(tty, &ws); 953 } 954 955 if (con_is_visible(vc)) 956 update_screen(vc); 957 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num); 958 return err; 959 } 960 961 /** 962 * vc_resize - resize a VT 963 * @vc: virtual console 964 * @cols: columns 965 * @rows: rows 966 * 967 * Resize a virtual console as seen from the console end of things. We 968 * use the common vc_do_resize methods to update the structures. The 969 * caller must hold the console sem to protect console internals and 970 * vc->port.tty 971 */ 972 973 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows) 974 { 975 return vc_do_resize(vc->port.tty, vc, cols, rows); 976 } 977 978 /** 979 * vt_resize - resize a VT 980 * @tty: tty to resize 981 * @ws: winsize attributes 982 * 983 * Resize a virtual terminal. This is called by the tty layer as we 984 * register our own handler for resizing. The mutual helper does all 985 * the actual work. 986 * 987 * Takes the console sem and the called methods then take the tty 988 * termios_rwsem and the tty ctrl_lock in that order. 989 */ 990 static int vt_resize(struct tty_struct *tty, struct winsize *ws) 991 { 992 struct vc_data *vc = tty->driver_data; 993 int ret; 994 995 console_lock(); 996 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row); 997 console_unlock(); 998 return ret; 999 } 1000 1001 struct vc_data *vc_deallocate(unsigned int currcons) 1002 { 1003 struct vc_data *vc = NULL; 1004 1005 WARN_CONSOLE_UNLOCKED(); 1006 1007 if (vc_cons_allocated(currcons)) { 1008 struct vt_notifier_param param; 1009 1010 param.vc = vc = vc_cons[currcons].d; 1011 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, ¶m); 1012 vcs_remove_sysfs(currcons); 1013 vc->vc_sw->con_deinit(vc); 1014 put_pid(vc->vt_pid); 1015 module_put(vc->vc_sw->owner); 1016 kfree(vc->vc_screenbuf); 1017 vc_cons[currcons].d = NULL; 1018 } 1019 return vc; 1020 } 1021 1022 /* 1023 * VT102 emulator 1024 */ 1025 1026 #define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x)) 1027 #define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x)) 1028 #define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x)) 1029 1030 #define decarm VC_REPEAT 1031 #define decckm VC_CKMODE 1032 #define kbdapplic VC_APPLIC 1033 #define lnm VC_CRLF 1034 1035 /* 1036 * this is what the terminal answers to a ESC-Z or csi0c query. 1037 */ 1038 #define VT100ID "\033[?1;2c" 1039 #define VT102ID "\033[?6c" 1040 1041 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7, 1042 8,12,10,14, 9,13,11,15 }; 1043 1044 /* the default colour table, for VGA+ colour systems */ 1045 unsigned char default_red[] = { 1046 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 1047 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff 1048 }; 1049 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR); 1050 1051 unsigned char default_grn[] = { 1052 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa, 1053 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff 1054 }; 1055 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR); 1056 1057 unsigned char default_blu[] = { 1058 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa, 1059 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff 1060 }; 1061 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR); 1062 1063 /* 1064 * gotoxy() must verify all boundaries, because the arguments 1065 * might also be negative. If the given position is out of 1066 * bounds, the cursor is placed at the nearest margin. 1067 */ 1068 static void gotoxy(struct vc_data *vc, int new_x, int new_y) 1069 { 1070 int min_y, max_y; 1071 1072 if (new_x < 0) 1073 vc->vc_x = 0; 1074 else { 1075 if (new_x >= vc->vc_cols) 1076 vc->vc_x = vc->vc_cols - 1; 1077 else 1078 vc->vc_x = new_x; 1079 } 1080 1081 if (vc->vc_decom) { 1082 min_y = vc->vc_top; 1083 max_y = vc->vc_bottom; 1084 } else { 1085 min_y = 0; 1086 max_y = vc->vc_rows; 1087 } 1088 if (new_y < min_y) 1089 vc->vc_y = min_y; 1090 else if (new_y >= max_y) 1091 vc->vc_y = max_y - 1; 1092 else 1093 vc->vc_y = new_y; 1094 vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1); 1095 vc->vc_need_wrap = 0; 1096 } 1097 1098 /* for absolute user moves, when decom is set */ 1099 static void gotoxay(struct vc_data *vc, int new_x, int new_y) 1100 { 1101 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y); 1102 } 1103 1104 void scrollback(struct vc_data *vc) 1105 { 1106 scrolldelta(-(vc->vc_rows / 2)); 1107 } 1108 1109 void scrollfront(struct vc_data *vc, int lines) 1110 { 1111 if (!lines) 1112 lines = vc->vc_rows / 2; 1113 scrolldelta(lines); 1114 } 1115 1116 static void lf(struct vc_data *vc) 1117 { 1118 /* don't scroll if above bottom of scrolling region, or 1119 * if below scrolling region 1120 */ 1121 if (vc->vc_y + 1 == vc->vc_bottom) 1122 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1); 1123 else if (vc->vc_y < vc->vc_rows - 1) { 1124 vc->vc_y++; 1125 vc->vc_pos += vc->vc_size_row; 1126 } 1127 vc->vc_need_wrap = 0; 1128 notify_write(vc, '\n'); 1129 } 1130 1131 static void ri(struct vc_data *vc) 1132 { 1133 /* don't scroll if below top of scrolling region, or 1134 * if above scrolling region 1135 */ 1136 if (vc->vc_y == vc->vc_top) 1137 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1); 1138 else if (vc->vc_y > 0) { 1139 vc->vc_y--; 1140 vc->vc_pos -= vc->vc_size_row; 1141 } 1142 vc->vc_need_wrap = 0; 1143 } 1144 1145 static inline void cr(struct vc_data *vc) 1146 { 1147 vc->vc_pos -= vc->vc_x << 1; 1148 vc->vc_need_wrap = vc->vc_x = 0; 1149 notify_write(vc, '\r'); 1150 } 1151 1152 static inline void bs(struct vc_data *vc) 1153 { 1154 if (vc->vc_x) { 1155 vc->vc_pos -= 2; 1156 vc->vc_x--; 1157 vc->vc_need_wrap = 0; 1158 notify_write(vc, '\b'); 1159 } 1160 } 1161 1162 static inline void del(struct vc_data *vc) 1163 { 1164 /* ignored */ 1165 } 1166 1167 static void csi_J(struct vc_data *vc, int vpar) 1168 { 1169 unsigned int count; 1170 unsigned short * start; 1171 1172 switch (vpar) { 1173 case 0: /* erase from cursor to end of display */ 1174 count = (vc->vc_scr_end - vc->vc_pos) >> 1; 1175 start = (unsigned short *)vc->vc_pos; 1176 break; 1177 case 1: /* erase from start to cursor */ 1178 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1; 1179 start = (unsigned short *)vc->vc_origin; 1180 break; 1181 case 3: /* erase scroll-back buffer (and whole display) */ 1182 scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char, 1183 vc->vc_screenbuf_size); 1184 flush_scrollback(vc); 1185 set_origin(vc); 1186 if (con_is_visible(vc)) 1187 update_screen(vc); 1188 /* fall through */ 1189 case 2: /* erase whole display */ 1190 count = vc->vc_cols * vc->vc_rows; 1191 start = (unsigned short *)vc->vc_origin; 1192 break; 1193 default: 1194 return; 1195 } 1196 scr_memsetw(start, vc->vc_video_erase_char, 2 * count); 1197 if (con_should_update(vc)) 1198 do_update_region(vc, (unsigned long) start, count); 1199 vc->vc_need_wrap = 0; 1200 } 1201 1202 static void csi_K(struct vc_data *vc, int vpar) 1203 { 1204 unsigned int count; 1205 unsigned short * start; 1206 1207 switch (vpar) { 1208 case 0: /* erase from cursor to end of line */ 1209 count = vc->vc_cols - vc->vc_x; 1210 start = (unsigned short *)vc->vc_pos; 1211 break; 1212 case 1: /* erase from start of line to cursor */ 1213 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1)); 1214 count = vc->vc_x + 1; 1215 break; 1216 case 2: /* erase whole line */ 1217 start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1)); 1218 count = vc->vc_cols; 1219 break; 1220 default: 1221 return; 1222 } 1223 scr_memsetw(start, vc->vc_video_erase_char, 2 * count); 1224 vc->vc_need_wrap = 0; 1225 if (con_should_update(vc)) 1226 do_update_region(vc, (unsigned long) start, count); 1227 } 1228 1229 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */ 1230 { /* not vt100? */ 1231 int count; 1232 1233 if (!vpar) 1234 vpar++; 1235 count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar; 1236 1237 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count); 1238 if (con_should_update(vc)) 1239 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count); 1240 vc->vc_need_wrap = 0; 1241 } 1242 1243 static void default_attr(struct vc_data *vc) 1244 { 1245 vc->vc_intensity = 1; 1246 vc->vc_italic = 0; 1247 vc->vc_underline = 0; 1248 vc->vc_reverse = 0; 1249 vc->vc_blink = 0; 1250 vc->vc_color = vc->vc_def_color; 1251 } 1252 1253 struct rgb { u8 r; u8 g; u8 b; }; 1254 1255 static void rgb_from_256(int i, struct rgb *c) 1256 { 1257 if (i < 8) { /* Standard colours. */ 1258 c->r = i&1 ? 0xaa : 0x00; 1259 c->g = i&2 ? 0xaa : 0x00; 1260 c->b = i&4 ? 0xaa : 0x00; 1261 } else if (i < 16) { 1262 c->r = i&1 ? 0xff : 0x55; 1263 c->g = i&2 ? 0xff : 0x55; 1264 c->b = i&4 ? 0xff : 0x55; 1265 } else if (i < 232) { /* 6x6x6 colour cube. */ 1266 c->r = (i - 16) / 36 * 85 / 2; 1267 c->g = (i - 16) / 6 % 6 * 85 / 2; 1268 c->b = (i - 16) % 6 * 85 / 2; 1269 } else /* Grayscale ramp. */ 1270 c->r = c->g = c->b = i * 10 - 2312; 1271 } 1272 1273 static void rgb_foreground(struct vc_data *vc, const struct rgb *c) 1274 { 1275 u8 hue = 0, max = max3(c->r, c->g, c->b); 1276 1277 if (c->r > max / 2) 1278 hue |= 4; 1279 if (c->g > max / 2) 1280 hue |= 2; 1281 if (c->b > max / 2) 1282 hue |= 1; 1283 1284 if (hue == 7 && max <= 0x55) { 1285 hue = 0; 1286 vc->vc_intensity = 2; 1287 } else if (max > 0xaa) 1288 vc->vc_intensity = 2; 1289 else 1290 vc->vc_intensity = 1; 1291 1292 vc->vc_color = (vc->vc_color & 0xf0) | hue; 1293 } 1294 1295 static void rgb_background(struct vc_data *vc, const struct rgb *c) 1296 { 1297 /* For backgrounds, err on the dark side. */ 1298 vc->vc_color = (vc->vc_color & 0x0f) 1299 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3; 1300 } 1301 1302 /* 1303 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes 1304 * and thus need to be detected and ignored by hand. Strictly speaking, that 1305 * standard also wants : rather than ; as separators, contrary to ECMA-48, but 1306 * no one produces such codes and almost no one accepts them. 1307 * 1308 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in 1309 * supporting them. 1310 */ 1311 static int vc_t416_color(struct vc_data *vc, int i, 1312 void(*set_color)(struct vc_data *vc, const struct rgb *c)) 1313 { 1314 struct rgb c; 1315 1316 i++; 1317 if (i > vc->vc_npar) 1318 return i; 1319 1320 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) { 1321 /* 256 colours */ 1322 i++; 1323 rgb_from_256(vc->vc_par[i], &c); 1324 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) { 1325 /* 24 bit */ 1326 c.r = vc->vc_par[i + 1]; 1327 c.g = vc->vc_par[i + 2]; 1328 c.b = vc->vc_par[i + 3]; 1329 i += 3; 1330 } else 1331 return i; 1332 1333 set_color(vc, &c); 1334 1335 return i; 1336 } 1337 1338 /* console_lock is held */ 1339 static void csi_m(struct vc_data *vc) 1340 { 1341 int i; 1342 1343 for (i = 0; i <= vc->vc_npar; i++) 1344 switch (vc->vc_par[i]) { 1345 case 0: /* all attributes off */ 1346 default_attr(vc); 1347 break; 1348 case 1: 1349 vc->vc_intensity = 2; 1350 break; 1351 case 2: 1352 vc->vc_intensity = 0; 1353 break; 1354 case 3: 1355 vc->vc_italic = 1; 1356 break; 1357 case 4: 1358 vc->vc_underline = 1; 1359 break; 1360 case 5: 1361 vc->vc_blink = 1; 1362 break; 1363 case 7: 1364 vc->vc_reverse = 1; 1365 break; 1366 case 10: /* ANSI X3.64-1979 (SCO-ish?) 1367 * Select primary font, don't display control chars if 1368 * defined, don't set bit 8 on output. 1369 */ 1370 vc->vc_translate = set_translate(vc->vc_charset == 0 1371 ? vc->vc_G0_charset 1372 : vc->vc_G1_charset, vc); 1373 vc->vc_disp_ctrl = 0; 1374 vc->vc_toggle_meta = 0; 1375 break; 1376 case 11: /* ANSI X3.64-1979 (SCO-ish?) 1377 * Select first alternate font, lets chars < 32 be 1378 * displayed as ROM chars. 1379 */ 1380 vc->vc_translate = set_translate(IBMPC_MAP, vc); 1381 vc->vc_disp_ctrl = 1; 1382 vc->vc_toggle_meta = 0; 1383 break; 1384 case 12: /* ANSI X3.64-1979 (SCO-ish?) 1385 * Select second alternate font, toggle high bit 1386 * before displaying as ROM char. 1387 */ 1388 vc->vc_translate = set_translate(IBMPC_MAP, vc); 1389 vc->vc_disp_ctrl = 1; 1390 vc->vc_toggle_meta = 1; 1391 break; 1392 case 21: 1393 case 22: 1394 vc->vc_intensity = 1; 1395 break; 1396 case 23: 1397 vc->vc_italic = 0; 1398 break; 1399 case 24: 1400 vc->vc_underline = 0; 1401 break; 1402 case 25: 1403 vc->vc_blink = 0; 1404 break; 1405 case 27: 1406 vc->vc_reverse = 0; 1407 break; 1408 case 38: 1409 i = vc_t416_color(vc, i, rgb_foreground); 1410 break; 1411 case 48: 1412 i = vc_t416_color(vc, i, rgb_background); 1413 break; 1414 case 39: 1415 vc->vc_color = (vc->vc_def_color & 0x0f) | 1416 (vc->vc_color & 0xf0); 1417 break; 1418 case 49: 1419 vc->vc_color = (vc->vc_def_color & 0xf0) | 1420 (vc->vc_color & 0x0f); 1421 break; 1422 default: 1423 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) { 1424 if (vc->vc_par[i] < 100) 1425 vc->vc_intensity = 2; 1426 vc->vc_par[i] -= 60; 1427 } 1428 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37) 1429 vc->vc_color = color_table[vc->vc_par[i] - 30] 1430 | (vc->vc_color & 0xf0); 1431 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47) 1432 vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4) 1433 | (vc->vc_color & 0x0f); 1434 break; 1435 } 1436 update_attr(vc); 1437 } 1438 1439 static void respond_string(const char *p, struct tty_port *port) 1440 { 1441 while (*p) { 1442 tty_insert_flip_char(port, *p, 0); 1443 p++; 1444 } 1445 tty_schedule_flip(port); 1446 } 1447 1448 static void cursor_report(struct vc_data *vc, struct tty_struct *tty) 1449 { 1450 char buf[40]; 1451 1452 sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1); 1453 respond_string(buf, tty->port); 1454 } 1455 1456 static inline void status_report(struct tty_struct *tty) 1457 { 1458 respond_string("\033[0n", tty->port); /* Terminal ok */ 1459 } 1460 1461 static inline void respond_ID(struct tty_struct *tty) 1462 { 1463 respond_string(VT102ID, tty->port); 1464 } 1465 1466 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry) 1467 { 1468 char buf[8]; 1469 1470 sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx), 1471 (char)('!' + mry)); 1472 respond_string(buf, tty->port); 1473 } 1474 1475 /* invoked via ioctl(TIOCLINUX) and through set_selection */ 1476 int mouse_reporting(void) 1477 { 1478 return vc_cons[fg_console].d->vc_report_mouse; 1479 } 1480 1481 /* console_lock is held */ 1482 static void set_mode(struct vc_data *vc, int on_off) 1483 { 1484 int i; 1485 1486 for (i = 0; i <= vc->vc_npar; i++) 1487 if (vc->vc_ques) { 1488 switch(vc->vc_par[i]) { /* DEC private modes set/reset */ 1489 case 1: /* Cursor keys send ^[Ox/^[[x */ 1490 if (on_off) 1491 set_kbd(vc, decckm); 1492 else 1493 clr_kbd(vc, decckm); 1494 break; 1495 case 3: /* 80/132 mode switch unimplemented */ 1496 #if 0 1497 vc_resize(deccolm ? 132 : 80, vc->vc_rows); 1498 /* this alone does not suffice; some user mode 1499 utility has to change the hardware regs */ 1500 #endif 1501 break; 1502 case 5: /* Inverted screen on/off */ 1503 if (vc->vc_decscnm != on_off) { 1504 vc->vc_decscnm = on_off; 1505 invert_screen(vc, 0, vc->vc_screenbuf_size, 0); 1506 update_attr(vc); 1507 } 1508 break; 1509 case 6: /* Origin relative/absolute */ 1510 vc->vc_decom = on_off; 1511 gotoxay(vc, 0, 0); 1512 break; 1513 case 7: /* Autowrap on/off */ 1514 vc->vc_decawm = on_off; 1515 break; 1516 case 8: /* Autorepeat on/off */ 1517 if (on_off) 1518 set_kbd(vc, decarm); 1519 else 1520 clr_kbd(vc, decarm); 1521 break; 1522 case 9: 1523 vc->vc_report_mouse = on_off ? 1 : 0; 1524 break; 1525 case 25: /* Cursor on/off */ 1526 vc->vc_deccm = on_off; 1527 break; 1528 case 1000: 1529 vc->vc_report_mouse = on_off ? 2 : 0; 1530 break; 1531 } 1532 } else { 1533 switch(vc->vc_par[i]) { /* ANSI modes set/reset */ 1534 case 3: /* Monitor (display ctrls) */ 1535 vc->vc_disp_ctrl = on_off; 1536 break; 1537 case 4: /* Insert Mode on/off */ 1538 vc->vc_decim = on_off; 1539 break; 1540 case 20: /* Lf, Enter == CrLf/Lf */ 1541 if (on_off) 1542 set_kbd(vc, lnm); 1543 else 1544 clr_kbd(vc, lnm); 1545 break; 1546 } 1547 } 1548 } 1549 1550 /* console_lock is held */ 1551 static void setterm_command(struct vc_data *vc) 1552 { 1553 switch(vc->vc_par[0]) { 1554 case 1: /* set color for underline mode */ 1555 if (vc->vc_can_do_color && 1556 vc->vc_par[1] < 16) { 1557 vc->vc_ulcolor = color_table[vc->vc_par[1]]; 1558 if (vc->vc_underline) 1559 update_attr(vc); 1560 } 1561 break; 1562 case 2: /* set color for half intensity mode */ 1563 if (vc->vc_can_do_color && 1564 vc->vc_par[1] < 16) { 1565 vc->vc_halfcolor = color_table[vc->vc_par[1]]; 1566 if (vc->vc_intensity == 0) 1567 update_attr(vc); 1568 } 1569 break; 1570 case 8: /* store colors as defaults */ 1571 vc->vc_def_color = vc->vc_attr; 1572 if (vc->vc_hi_font_mask == 0x100) 1573 vc->vc_def_color >>= 1; 1574 default_attr(vc); 1575 update_attr(vc); 1576 break; 1577 case 9: /* set blanking interval */ 1578 blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60; 1579 poke_blanked_console(); 1580 break; 1581 case 10: /* set bell frequency in Hz */ 1582 if (vc->vc_npar >= 1) 1583 vc->vc_bell_pitch = vc->vc_par[1]; 1584 else 1585 vc->vc_bell_pitch = DEFAULT_BELL_PITCH; 1586 break; 1587 case 11: /* set bell duration in msec */ 1588 if (vc->vc_npar >= 1) 1589 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ? 1590 msecs_to_jiffies(vc->vc_par[1]) : 0; 1591 else 1592 vc->vc_bell_duration = DEFAULT_BELL_DURATION; 1593 break; 1594 case 12: /* bring specified console to the front */ 1595 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1)) 1596 set_console(vc->vc_par[1] - 1); 1597 break; 1598 case 13: /* unblank the screen */ 1599 poke_blanked_console(); 1600 break; 1601 case 14: /* set vesa powerdown interval */ 1602 vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ; 1603 break; 1604 case 15: /* activate the previous console */ 1605 set_console(last_console); 1606 break; 1607 case 16: /* set cursor blink duration in msec */ 1608 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 && 1609 vc->vc_par[1] <= USHRT_MAX) 1610 vc->vc_cur_blink_ms = vc->vc_par[1]; 1611 else 1612 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS; 1613 break; 1614 } 1615 } 1616 1617 /* console_lock is held */ 1618 static void csi_at(struct vc_data *vc, unsigned int nr) 1619 { 1620 if (nr > vc->vc_cols - vc->vc_x) 1621 nr = vc->vc_cols - vc->vc_x; 1622 else if (!nr) 1623 nr = 1; 1624 insert_char(vc, nr); 1625 } 1626 1627 /* console_lock is held */ 1628 static void csi_L(struct vc_data *vc, unsigned int nr) 1629 { 1630 if (nr > vc->vc_rows - vc->vc_y) 1631 nr = vc->vc_rows - vc->vc_y; 1632 else if (!nr) 1633 nr = 1; 1634 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr); 1635 vc->vc_need_wrap = 0; 1636 } 1637 1638 /* console_lock is held */ 1639 static void csi_P(struct vc_data *vc, unsigned int nr) 1640 { 1641 if (nr > vc->vc_cols - vc->vc_x) 1642 nr = vc->vc_cols - vc->vc_x; 1643 else if (!nr) 1644 nr = 1; 1645 delete_char(vc, nr); 1646 } 1647 1648 /* console_lock is held */ 1649 static void csi_M(struct vc_data *vc, unsigned int nr) 1650 { 1651 if (nr > vc->vc_rows - vc->vc_y) 1652 nr = vc->vc_rows - vc->vc_y; 1653 else if (!nr) 1654 nr=1; 1655 con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_UP, nr); 1656 vc->vc_need_wrap = 0; 1657 } 1658 1659 /* console_lock is held (except via vc_init->reset_terminal */ 1660 static void save_cur(struct vc_data *vc) 1661 { 1662 vc->vc_saved_x = vc->vc_x; 1663 vc->vc_saved_y = vc->vc_y; 1664 vc->vc_s_intensity = vc->vc_intensity; 1665 vc->vc_s_italic = vc->vc_italic; 1666 vc->vc_s_underline = vc->vc_underline; 1667 vc->vc_s_blink = vc->vc_blink; 1668 vc->vc_s_reverse = vc->vc_reverse; 1669 vc->vc_s_charset = vc->vc_charset; 1670 vc->vc_s_color = vc->vc_color; 1671 vc->vc_saved_G0 = vc->vc_G0_charset; 1672 vc->vc_saved_G1 = vc->vc_G1_charset; 1673 } 1674 1675 /* console_lock is held */ 1676 static void restore_cur(struct vc_data *vc) 1677 { 1678 gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y); 1679 vc->vc_intensity = vc->vc_s_intensity; 1680 vc->vc_italic = vc->vc_s_italic; 1681 vc->vc_underline = vc->vc_s_underline; 1682 vc->vc_blink = vc->vc_s_blink; 1683 vc->vc_reverse = vc->vc_s_reverse; 1684 vc->vc_charset = vc->vc_s_charset; 1685 vc->vc_color = vc->vc_s_color; 1686 vc->vc_G0_charset = vc->vc_saved_G0; 1687 vc->vc_G1_charset = vc->vc_saved_G1; 1688 vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc); 1689 update_attr(vc); 1690 vc->vc_need_wrap = 0; 1691 } 1692 1693 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey, 1694 EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd, 1695 ESpalette, ESosc }; 1696 1697 /* console_lock is held (except via vc_init()) */ 1698 static void reset_terminal(struct vc_data *vc, int do_clear) 1699 { 1700 vc->vc_top = 0; 1701 vc->vc_bottom = vc->vc_rows; 1702 vc->vc_state = ESnormal; 1703 vc->vc_ques = 0; 1704 vc->vc_translate = set_translate(LAT1_MAP, vc); 1705 vc->vc_G0_charset = LAT1_MAP; 1706 vc->vc_G1_charset = GRAF_MAP; 1707 vc->vc_charset = 0; 1708 vc->vc_need_wrap = 0; 1709 vc->vc_report_mouse = 0; 1710 vc->vc_utf = default_utf8; 1711 vc->vc_utf_count = 0; 1712 1713 vc->vc_disp_ctrl = 0; 1714 vc->vc_toggle_meta = 0; 1715 1716 vc->vc_decscnm = 0; 1717 vc->vc_decom = 0; 1718 vc->vc_decawm = 1; 1719 vc->vc_deccm = global_cursor_default; 1720 vc->vc_decim = 0; 1721 1722 vt_reset_keyboard(vc->vc_num); 1723 1724 vc->vc_cursor_type = cur_default; 1725 vc->vc_complement_mask = vc->vc_s_complement_mask; 1726 1727 default_attr(vc); 1728 update_attr(vc); 1729 1730 vc->vc_tab_stop[0] = 0x01010100; 1731 vc->vc_tab_stop[1] = 1732 vc->vc_tab_stop[2] = 1733 vc->vc_tab_stop[3] = 1734 vc->vc_tab_stop[4] = 1735 vc->vc_tab_stop[5] = 1736 vc->vc_tab_stop[6] = 1737 vc->vc_tab_stop[7] = 0x01010101; 1738 1739 vc->vc_bell_pitch = DEFAULT_BELL_PITCH; 1740 vc->vc_bell_duration = DEFAULT_BELL_DURATION; 1741 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS; 1742 1743 gotoxy(vc, 0, 0); 1744 save_cur(vc); 1745 if (do_clear) 1746 csi_J(vc, 2); 1747 } 1748 1749 /* console_lock is held */ 1750 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c) 1751 { 1752 /* 1753 * Control characters can be used in the _middle_ 1754 * of an escape sequence. 1755 */ 1756 if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */ 1757 return; 1758 switch (c) { 1759 case 0: 1760 return; 1761 case 7: 1762 if (vc->vc_state == ESosc) 1763 vc->vc_state = ESnormal; 1764 else if (vc->vc_bell_duration) 1765 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration); 1766 return; 1767 case 8: 1768 bs(vc); 1769 return; 1770 case 9: 1771 vc->vc_pos -= (vc->vc_x << 1); 1772 while (vc->vc_x < vc->vc_cols - 1) { 1773 vc->vc_x++; 1774 if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31))) 1775 break; 1776 } 1777 vc->vc_pos += (vc->vc_x << 1); 1778 notify_write(vc, '\t'); 1779 return; 1780 case 10: case 11: case 12: 1781 lf(vc); 1782 if (!is_kbd(vc, lnm)) 1783 return; 1784 case 13: 1785 cr(vc); 1786 return; 1787 case 14: 1788 vc->vc_charset = 1; 1789 vc->vc_translate = set_translate(vc->vc_G1_charset, vc); 1790 vc->vc_disp_ctrl = 1; 1791 return; 1792 case 15: 1793 vc->vc_charset = 0; 1794 vc->vc_translate = set_translate(vc->vc_G0_charset, vc); 1795 vc->vc_disp_ctrl = 0; 1796 return; 1797 case 24: case 26: 1798 vc->vc_state = ESnormal; 1799 return; 1800 case 27: 1801 vc->vc_state = ESesc; 1802 return; 1803 case 127: 1804 del(vc); 1805 return; 1806 case 128+27: 1807 vc->vc_state = ESsquare; 1808 return; 1809 } 1810 switch(vc->vc_state) { 1811 case ESesc: 1812 vc->vc_state = ESnormal; 1813 switch (c) { 1814 case '[': 1815 vc->vc_state = ESsquare; 1816 return; 1817 case ']': 1818 vc->vc_state = ESnonstd; 1819 return; 1820 case '%': 1821 vc->vc_state = ESpercent; 1822 return; 1823 case 'E': 1824 cr(vc); 1825 lf(vc); 1826 return; 1827 case 'M': 1828 ri(vc); 1829 return; 1830 case 'D': 1831 lf(vc); 1832 return; 1833 case 'H': 1834 vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31)); 1835 return; 1836 case 'Z': 1837 respond_ID(tty); 1838 return; 1839 case '7': 1840 save_cur(vc); 1841 return; 1842 case '8': 1843 restore_cur(vc); 1844 return; 1845 case '(': 1846 vc->vc_state = ESsetG0; 1847 return; 1848 case ')': 1849 vc->vc_state = ESsetG1; 1850 return; 1851 case '#': 1852 vc->vc_state = EShash; 1853 return; 1854 case 'c': 1855 reset_terminal(vc, 1); 1856 return; 1857 case '>': /* Numeric keypad */ 1858 clr_kbd(vc, kbdapplic); 1859 return; 1860 case '=': /* Appl. keypad */ 1861 set_kbd(vc, kbdapplic); 1862 return; 1863 } 1864 return; 1865 case ESnonstd: 1866 if (c=='P') { /* palette escape sequence */ 1867 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++) 1868 vc->vc_par[vc->vc_npar] = 0; 1869 vc->vc_npar = 0; 1870 vc->vc_state = ESpalette; 1871 return; 1872 } else if (c=='R') { /* reset palette */ 1873 reset_palette(vc); 1874 vc->vc_state = ESnormal; 1875 } else if (c>='0' && c<='9') 1876 vc->vc_state = ESosc; 1877 else 1878 vc->vc_state = ESnormal; 1879 return; 1880 case ESpalette: 1881 if (isxdigit(c)) { 1882 vc->vc_par[vc->vc_npar++] = hex_to_bin(c); 1883 if (vc->vc_npar == 7) { 1884 int i = vc->vc_par[0] * 3, j = 1; 1885 vc->vc_palette[i] = 16 * vc->vc_par[j++]; 1886 vc->vc_palette[i++] += vc->vc_par[j++]; 1887 vc->vc_palette[i] = 16 * vc->vc_par[j++]; 1888 vc->vc_palette[i++] += vc->vc_par[j++]; 1889 vc->vc_palette[i] = 16 * vc->vc_par[j++]; 1890 vc->vc_palette[i] += vc->vc_par[j]; 1891 set_palette(vc); 1892 vc->vc_state = ESnormal; 1893 } 1894 } else 1895 vc->vc_state = ESnormal; 1896 return; 1897 case ESsquare: 1898 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++) 1899 vc->vc_par[vc->vc_npar] = 0; 1900 vc->vc_npar = 0; 1901 vc->vc_state = ESgetpars; 1902 if (c == '[') { /* Function key */ 1903 vc->vc_state=ESfunckey; 1904 return; 1905 } 1906 vc->vc_ques = (c == '?'); 1907 if (vc->vc_ques) 1908 return; 1909 case ESgetpars: 1910 if (c == ';' && vc->vc_npar < NPAR - 1) { 1911 vc->vc_npar++; 1912 return; 1913 } else if (c>='0' && c<='9') { 1914 vc->vc_par[vc->vc_npar] *= 10; 1915 vc->vc_par[vc->vc_npar] += c - '0'; 1916 return; 1917 } 1918 vc->vc_state = ESnormal; 1919 switch(c) { 1920 case 'h': 1921 set_mode(vc, 1); 1922 return; 1923 case 'l': 1924 set_mode(vc, 0); 1925 return; 1926 case 'c': 1927 if (vc->vc_ques) { 1928 if (vc->vc_par[0]) 1929 vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16); 1930 else 1931 vc->vc_cursor_type = cur_default; 1932 return; 1933 } 1934 break; 1935 case 'm': 1936 if (vc->vc_ques) { 1937 clear_selection(); 1938 if (vc->vc_par[0]) 1939 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1]; 1940 else 1941 vc->vc_complement_mask = vc->vc_s_complement_mask; 1942 return; 1943 } 1944 break; 1945 case 'n': 1946 if (!vc->vc_ques) { 1947 if (vc->vc_par[0] == 5) 1948 status_report(tty); 1949 else if (vc->vc_par[0] == 6) 1950 cursor_report(vc, tty); 1951 } 1952 return; 1953 } 1954 if (vc->vc_ques) { 1955 vc->vc_ques = 0; 1956 return; 1957 } 1958 switch(c) { 1959 case 'G': case '`': 1960 if (vc->vc_par[0]) 1961 vc->vc_par[0]--; 1962 gotoxy(vc, vc->vc_par[0], vc->vc_y); 1963 return; 1964 case 'A': 1965 if (!vc->vc_par[0]) 1966 vc->vc_par[0]++; 1967 gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]); 1968 return; 1969 case 'B': case 'e': 1970 if (!vc->vc_par[0]) 1971 vc->vc_par[0]++; 1972 gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]); 1973 return; 1974 case 'C': case 'a': 1975 if (!vc->vc_par[0]) 1976 vc->vc_par[0]++; 1977 gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y); 1978 return; 1979 case 'D': 1980 if (!vc->vc_par[0]) 1981 vc->vc_par[0]++; 1982 gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y); 1983 return; 1984 case 'E': 1985 if (!vc->vc_par[0]) 1986 vc->vc_par[0]++; 1987 gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]); 1988 return; 1989 case 'F': 1990 if (!vc->vc_par[0]) 1991 vc->vc_par[0]++; 1992 gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]); 1993 return; 1994 case 'd': 1995 if (vc->vc_par[0]) 1996 vc->vc_par[0]--; 1997 gotoxay(vc, vc->vc_x ,vc->vc_par[0]); 1998 return; 1999 case 'H': case 'f': 2000 if (vc->vc_par[0]) 2001 vc->vc_par[0]--; 2002 if (vc->vc_par[1]) 2003 vc->vc_par[1]--; 2004 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]); 2005 return; 2006 case 'J': 2007 csi_J(vc, vc->vc_par[0]); 2008 return; 2009 case 'K': 2010 csi_K(vc, vc->vc_par[0]); 2011 return; 2012 case 'L': 2013 csi_L(vc, vc->vc_par[0]); 2014 return; 2015 case 'M': 2016 csi_M(vc, vc->vc_par[0]); 2017 return; 2018 case 'P': 2019 csi_P(vc, vc->vc_par[0]); 2020 return; 2021 case 'c': 2022 if (!vc->vc_par[0]) 2023 respond_ID(tty); 2024 return; 2025 case 'g': 2026 if (!vc->vc_par[0]) 2027 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31)); 2028 else if (vc->vc_par[0] == 3) { 2029 vc->vc_tab_stop[0] = 2030 vc->vc_tab_stop[1] = 2031 vc->vc_tab_stop[2] = 2032 vc->vc_tab_stop[3] = 2033 vc->vc_tab_stop[4] = 2034 vc->vc_tab_stop[5] = 2035 vc->vc_tab_stop[6] = 2036 vc->vc_tab_stop[7] = 0; 2037 } 2038 return; 2039 case 'm': 2040 csi_m(vc); 2041 return; 2042 case 'q': /* DECLL - but only 3 leds */ 2043 /* map 0,1,2,3 to 0,1,2,4 */ 2044 if (vc->vc_par[0] < 4) 2045 vt_set_led_state(vc->vc_num, 2046 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4); 2047 return; 2048 case 'r': 2049 if (!vc->vc_par[0]) 2050 vc->vc_par[0]++; 2051 if (!vc->vc_par[1]) 2052 vc->vc_par[1] = vc->vc_rows; 2053 /* Minimum allowed region is 2 lines */ 2054 if (vc->vc_par[0] < vc->vc_par[1] && 2055 vc->vc_par[1] <= vc->vc_rows) { 2056 vc->vc_top = vc->vc_par[0] - 1; 2057 vc->vc_bottom = vc->vc_par[1]; 2058 gotoxay(vc, 0, 0); 2059 } 2060 return; 2061 case 's': 2062 save_cur(vc); 2063 return; 2064 case 'u': 2065 restore_cur(vc); 2066 return; 2067 case 'X': 2068 csi_X(vc, vc->vc_par[0]); 2069 return; 2070 case '@': 2071 csi_at(vc, vc->vc_par[0]); 2072 return; 2073 case ']': /* setterm functions */ 2074 setterm_command(vc); 2075 return; 2076 } 2077 return; 2078 case ESpercent: 2079 vc->vc_state = ESnormal; 2080 switch (c) { 2081 case '@': /* defined in ISO 2022 */ 2082 vc->vc_utf = 0; 2083 return; 2084 case 'G': /* prelim official escape code */ 2085 case '8': /* retained for compatibility */ 2086 vc->vc_utf = 1; 2087 return; 2088 } 2089 return; 2090 case ESfunckey: 2091 vc->vc_state = ESnormal; 2092 return; 2093 case EShash: 2094 vc->vc_state = ESnormal; 2095 if (c == '8') { 2096 /* DEC screen alignment test. kludge :-) */ 2097 vc->vc_video_erase_char = 2098 (vc->vc_video_erase_char & 0xff00) | 'E'; 2099 csi_J(vc, 2); 2100 vc->vc_video_erase_char = 2101 (vc->vc_video_erase_char & 0xff00) | ' '; 2102 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2); 2103 } 2104 return; 2105 case ESsetG0: 2106 if (c == '0') 2107 vc->vc_G0_charset = GRAF_MAP; 2108 else if (c == 'B') 2109 vc->vc_G0_charset = LAT1_MAP; 2110 else if (c == 'U') 2111 vc->vc_G0_charset = IBMPC_MAP; 2112 else if (c == 'K') 2113 vc->vc_G0_charset = USER_MAP; 2114 if (vc->vc_charset == 0) 2115 vc->vc_translate = set_translate(vc->vc_G0_charset, vc); 2116 vc->vc_state = ESnormal; 2117 return; 2118 case ESsetG1: 2119 if (c == '0') 2120 vc->vc_G1_charset = GRAF_MAP; 2121 else if (c == 'B') 2122 vc->vc_G1_charset = LAT1_MAP; 2123 else if (c == 'U') 2124 vc->vc_G1_charset = IBMPC_MAP; 2125 else if (c == 'K') 2126 vc->vc_G1_charset = USER_MAP; 2127 if (vc->vc_charset == 1) 2128 vc->vc_translate = set_translate(vc->vc_G1_charset, vc); 2129 vc->vc_state = ESnormal; 2130 return; 2131 case ESosc: 2132 return; 2133 default: 2134 vc->vc_state = ESnormal; 2135 } 2136 } 2137 2138 /* is_double_width() is based on the wcwidth() implementation by 2139 * Markus Kuhn -- 2007-05-26 (Unicode 5.0) 2140 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c 2141 */ 2142 struct interval { 2143 uint32_t first; 2144 uint32_t last; 2145 }; 2146 2147 static int ucs_cmp(const void *key, const void *elt) 2148 { 2149 uint32_t ucs = *(uint32_t *)key; 2150 struct interval e = *(struct interval *) elt; 2151 2152 if (ucs > e.last) 2153 return 1; 2154 else if (ucs < e.first) 2155 return -1; 2156 return 0; 2157 } 2158 2159 static int is_double_width(uint32_t ucs) 2160 { 2161 static const struct interval double_width[] = { 2162 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E }, 2163 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF }, 2164 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 }, 2165 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD } 2166 }; 2167 if (ucs < double_width[0].first || 2168 ucs > double_width[ARRAY_SIZE(double_width) - 1].last) 2169 return 0; 2170 2171 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width), 2172 sizeof(struct interval), ucs_cmp) != NULL; 2173 } 2174 2175 static void con_flush(struct vc_data *vc, unsigned long draw_from, 2176 unsigned long draw_to, int *draw_x) 2177 { 2178 if (*draw_x < 0) 2179 return; 2180 2181 vc->vc_sw->con_putcs(vc, (u16 *)draw_from, 2182 (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, *draw_x); 2183 *draw_x = -1; 2184 } 2185 2186 /* acquires console_lock */ 2187 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count) 2188 { 2189 int c, tc, ok, n = 0, draw_x = -1; 2190 unsigned int currcons; 2191 unsigned long draw_from = 0, draw_to = 0; 2192 struct vc_data *vc; 2193 unsigned char vc_attr; 2194 struct vt_notifier_param param; 2195 uint8_t rescan; 2196 uint8_t inverse; 2197 uint8_t width; 2198 u16 himask, charmask; 2199 2200 if (in_interrupt()) 2201 return count; 2202 2203 might_sleep(); 2204 2205 console_lock(); 2206 vc = tty->driver_data; 2207 if (vc == NULL) { 2208 pr_err("vt: argh, driver_data is NULL !\n"); 2209 console_unlock(); 2210 return 0; 2211 } 2212 2213 currcons = vc->vc_num; 2214 if (!vc_cons_allocated(currcons)) { 2215 /* could this happen? */ 2216 pr_warn_once("con_write: tty %d not allocated\n", currcons+1); 2217 console_unlock(); 2218 return 0; 2219 } 2220 2221 himask = vc->vc_hi_font_mask; 2222 charmask = himask ? 0x1ff : 0xff; 2223 2224 /* undraw cursor first */ 2225 if (con_is_fg(vc)) 2226 hide_cursor(vc); 2227 2228 param.vc = vc; 2229 2230 while (!tty->stopped && count) { 2231 int orig = *buf; 2232 c = orig; 2233 buf++; 2234 n++; 2235 count--; 2236 rescan = 0; 2237 inverse = 0; 2238 width = 1; 2239 2240 /* Do no translation at all in control states */ 2241 if (vc->vc_state != ESnormal) { 2242 tc = c; 2243 } else if (vc->vc_utf && !vc->vc_disp_ctrl) { 2244 /* Combine UTF-8 into Unicode in vc_utf_char. 2245 * vc_utf_count is the number of continuation bytes still 2246 * expected to arrive. 2247 * vc_npar is the number of continuation bytes arrived so 2248 * far 2249 */ 2250 rescan_last_byte: 2251 if ((c & 0xc0) == 0x80) { 2252 /* Continuation byte received */ 2253 static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff }; 2254 if (vc->vc_utf_count) { 2255 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f); 2256 vc->vc_npar++; 2257 if (--vc->vc_utf_count) { 2258 /* Still need some bytes */ 2259 continue; 2260 } 2261 /* Got a whole character */ 2262 c = vc->vc_utf_char; 2263 /* Reject overlong sequences */ 2264 if (c <= utf8_length_changes[vc->vc_npar - 1] || 2265 c > utf8_length_changes[vc->vc_npar]) 2266 c = 0xfffd; 2267 } else { 2268 /* Unexpected continuation byte */ 2269 vc->vc_utf_count = 0; 2270 c = 0xfffd; 2271 } 2272 } else { 2273 /* Single ASCII byte or first byte of a sequence received */ 2274 if (vc->vc_utf_count) { 2275 /* Continuation byte expected */ 2276 rescan = 1; 2277 vc->vc_utf_count = 0; 2278 c = 0xfffd; 2279 } else if (c > 0x7f) { 2280 /* First byte of a multibyte sequence received */ 2281 vc->vc_npar = 0; 2282 if ((c & 0xe0) == 0xc0) { 2283 vc->vc_utf_count = 1; 2284 vc->vc_utf_char = (c & 0x1f); 2285 } else if ((c & 0xf0) == 0xe0) { 2286 vc->vc_utf_count = 2; 2287 vc->vc_utf_char = (c & 0x0f); 2288 } else if ((c & 0xf8) == 0xf0) { 2289 vc->vc_utf_count = 3; 2290 vc->vc_utf_char = (c & 0x07); 2291 } else if ((c & 0xfc) == 0xf8) { 2292 vc->vc_utf_count = 4; 2293 vc->vc_utf_char = (c & 0x03); 2294 } else if ((c & 0xfe) == 0xfc) { 2295 vc->vc_utf_count = 5; 2296 vc->vc_utf_char = (c & 0x01); 2297 } else { 2298 /* 254 and 255 are invalid */ 2299 c = 0xfffd; 2300 } 2301 if (vc->vc_utf_count) { 2302 /* Still need some bytes */ 2303 continue; 2304 } 2305 } 2306 /* Nothing to do if an ASCII byte was received */ 2307 } 2308 /* End of UTF-8 decoding. */ 2309 /* c is the received character, or U+FFFD for invalid sequences. */ 2310 /* Replace invalid Unicode code points with U+FFFD too */ 2311 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff) 2312 c = 0xfffd; 2313 tc = c; 2314 } else { /* no utf or alternate charset mode */ 2315 tc = vc_translate(vc, c); 2316 } 2317 2318 param.c = tc; 2319 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE, 2320 ¶m) == NOTIFY_STOP) 2321 continue; 2322 2323 /* If the original code was a control character we 2324 * only allow a glyph to be displayed if the code is 2325 * not normally used (such as for cursor movement) or 2326 * if the disp_ctrl mode has been explicitly enabled. 2327 * Certain characters (as given by the CTRL_ALWAYS 2328 * bitmap) are always displayed as control characters, 2329 * as the console would be pretty useless without 2330 * them; to display an arbitrary font position use the 2331 * direct-to-font zone in UTF-8 mode. 2332 */ 2333 ok = tc && (c >= 32 || 2334 !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 : 2335 vc->vc_utf || ((CTRL_ACTION >> c) & 1))) 2336 && (c != 127 || vc->vc_disp_ctrl) 2337 && (c != 128+27); 2338 2339 if (vc->vc_state == ESnormal && ok) { 2340 if (vc->vc_utf && !vc->vc_disp_ctrl) { 2341 if (is_double_width(c)) 2342 width = 2; 2343 } 2344 /* Now try to find out how to display it */ 2345 tc = conv_uni_to_pc(vc, tc); 2346 if (tc & ~charmask) { 2347 if (tc == -1 || tc == -2) { 2348 continue; /* nothing to display */ 2349 } 2350 /* Glyph not found */ 2351 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) { 2352 /* In legacy mode use the glyph we get by a 1:1 mapping. 2353 This would make absolutely no sense with Unicode in mind, 2354 but do this for ASCII characters since a font may lack 2355 Unicode mapping info and we don't want to end up with 2356 having question marks only. */ 2357 tc = c; 2358 } else { 2359 /* Display U+FFFD. If it's not found, display an inverse question mark. */ 2360 tc = conv_uni_to_pc(vc, 0xfffd); 2361 if (tc < 0) { 2362 inverse = 1; 2363 tc = conv_uni_to_pc(vc, '?'); 2364 if (tc < 0) tc = '?'; 2365 } 2366 } 2367 } 2368 2369 if (!inverse) { 2370 vc_attr = vc->vc_attr; 2371 } else { 2372 /* invert vc_attr */ 2373 if (!vc->vc_can_do_color) { 2374 vc_attr = (vc->vc_attr) ^ 0x08; 2375 } else if (vc->vc_hi_font_mask == 0x100) { 2376 vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4); 2377 } else { 2378 vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4); 2379 } 2380 con_flush(vc, draw_from, draw_to, &draw_x); 2381 } 2382 2383 while (1) { 2384 if (vc->vc_need_wrap || vc->vc_decim) 2385 con_flush(vc, draw_from, draw_to, 2386 &draw_x); 2387 if (vc->vc_need_wrap) { 2388 cr(vc); 2389 lf(vc); 2390 } 2391 if (vc->vc_decim) 2392 insert_char(vc, 1); 2393 scr_writew(himask ? 2394 ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) : 2395 (vc_attr << 8) + tc, 2396 (u16 *) vc->vc_pos); 2397 if (con_should_update(vc) && draw_x < 0) { 2398 draw_x = vc->vc_x; 2399 draw_from = vc->vc_pos; 2400 } 2401 if (vc->vc_x == vc->vc_cols - 1) { 2402 vc->vc_need_wrap = vc->vc_decawm; 2403 draw_to = vc->vc_pos + 2; 2404 } else { 2405 vc->vc_x++; 2406 draw_to = (vc->vc_pos += 2); 2407 } 2408 2409 if (!--width) break; 2410 2411 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */ 2412 if (tc < 0) tc = ' '; 2413 } 2414 notify_write(vc, c); 2415 2416 if (inverse) 2417 con_flush(vc, draw_from, draw_to, &draw_x); 2418 2419 if (rescan) { 2420 rescan = 0; 2421 inverse = 0; 2422 width = 1; 2423 c = orig; 2424 goto rescan_last_byte; 2425 } 2426 continue; 2427 } 2428 con_flush(vc, draw_from, draw_to, &draw_x); 2429 do_con_trol(tty, vc, orig); 2430 } 2431 con_flush(vc, draw_from, draw_to, &draw_x); 2432 console_conditional_schedule(); 2433 console_unlock(); 2434 notify_update(vc); 2435 return n; 2436 } 2437 2438 /* 2439 * This is the console switching callback. 2440 * 2441 * Doing console switching in a process context allows 2442 * us to do the switches asynchronously (needed when we want 2443 * to switch due to a keyboard interrupt). Synchronization 2444 * with other console code and prevention of re-entrancy is 2445 * ensured with console_lock. 2446 */ 2447 static void console_callback(struct work_struct *ignored) 2448 { 2449 console_lock(); 2450 2451 if (want_console >= 0) { 2452 if (want_console != fg_console && 2453 vc_cons_allocated(want_console)) { 2454 hide_cursor(vc_cons[fg_console].d); 2455 change_console(vc_cons[want_console].d); 2456 /* we only changed when the console had already 2457 been allocated - a new console is not created 2458 in an interrupt routine */ 2459 } 2460 want_console = -1; 2461 } 2462 if (do_poke_blanked_console) { /* do not unblank for a LED change */ 2463 do_poke_blanked_console = 0; 2464 poke_blanked_console(); 2465 } 2466 if (scrollback_delta) { 2467 struct vc_data *vc = vc_cons[fg_console].d; 2468 clear_selection(); 2469 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta) 2470 vc->vc_sw->con_scrolldelta(vc, scrollback_delta); 2471 scrollback_delta = 0; 2472 } 2473 if (blank_timer_expired) { 2474 do_blank_screen(0); 2475 blank_timer_expired = 0; 2476 } 2477 notify_update(vc_cons[fg_console].d); 2478 2479 console_unlock(); 2480 } 2481 2482 int set_console(int nr) 2483 { 2484 struct vc_data *vc = vc_cons[fg_console].d; 2485 2486 if (!vc_cons_allocated(nr) || vt_dont_switch || 2487 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) { 2488 2489 /* 2490 * Console switch will fail in console_callback() or 2491 * change_console() so there is no point scheduling 2492 * the callback 2493 * 2494 * Existing set_console() users don't check the return 2495 * value so this shouldn't break anything 2496 */ 2497 return -EINVAL; 2498 } 2499 2500 want_console = nr; 2501 schedule_console_callback(); 2502 2503 return 0; 2504 } 2505 2506 struct tty_driver *console_driver; 2507 2508 #ifdef CONFIG_VT_CONSOLE 2509 2510 /** 2511 * vt_kmsg_redirect() - Sets/gets the kernel message console 2512 * @new: The new virtual terminal number or -1 if the console should stay 2513 * unchanged 2514 * 2515 * By default, the kernel messages are always printed on the current virtual 2516 * console. However, the user may modify that default with the 2517 * TIOCL_SETKMSGREDIRECT ioctl call. 2518 * 2519 * This function sets the kernel message console to be @new. It returns the old 2520 * virtual console number. The virtual terminal number 0 (both as parameter and 2521 * return value) means no redirection (i.e. always printed on the currently 2522 * active console). 2523 * 2524 * The parameter -1 means that only the current console is returned, but the 2525 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that 2526 * case to make the code more understandable. 2527 * 2528 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores 2529 * the parameter and always returns 0. 2530 */ 2531 int vt_kmsg_redirect(int new) 2532 { 2533 static int kmsg_con; 2534 2535 if (new != -1) 2536 return xchg(&kmsg_con, new); 2537 else 2538 return kmsg_con; 2539 } 2540 2541 /* 2542 * Console on virtual terminal 2543 * 2544 * The console must be locked when we get here. 2545 */ 2546 2547 static void vt_console_print(struct console *co, const char *b, unsigned count) 2548 { 2549 struct vc_data *vc = vc_cons[fg_console].d; 2550 unsigned char c; 2551 static DEFINE_SPINLOCK(printing_lock); 2552 const ushort *start; 2553 ushort cnt = 0; 2554 ushort myx; 2555 int kmsg_console; 2556 2557 /* console busy or not yet initialized */ 2558 if (!printable) 2559 return; 2560 if (!spin_trylock(&printing_lock)) 2561 return; 2562 2563 kmsg_console = vt_get_kmsg_redirect(); 2564 if (kmsg_console && vc_cons_allocated(kmsg_console - 1)) 2565 vc = vc_cons[kmsg_console - 1].d; 2566 2567 /* read `x' only after setting currcons properly (otherwise 2568 the `x' macro will read the x of the foreground console). */ 2569 myx = vc->vc_x; 2570 2571 if (!vc_cons_allocated(fg_console)) { 2572 /* impossible */ 2573 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */ 2574 goto quit; 2575 } 2576 2577 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc)) 2578 goto quit; 2579 2580 /* undraw cursor first */ 2581 if (con_is_fg(vc)) 2582 hide_cursor(vc); 2583 2584 start = (ushort *)vc->vc_pos; 2585 2586 /* Contrived structure to try to emulate original need_wrap behaviour 2587 * Problems caused when we have need_wrap set on '\n' character */ 2588 while (count--) { 2589 c = *b++; 2590 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) { 2591 if (cnt > 0) { 2592 if (con_is_visible(vc)) 2593 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x); 2594 vc->vc_x += cnt; 2595 if (vc->vc_need_wrap) 2596 vc->vc_x--; 2597 cnt = 0; 2598 } 2599 if (c == 8) { /* backspace */ 2600 bs(vc); 2601 start = (ushort *)vc->vc_pos; 2602 myx = vc->vc_x; 2603 continue; 2604 } 2605 if (c != 13) 2606 lf(vc); 2607 cr(vc); 2608 start = (ushort *)vc->vc_pos; 2609 myx = vc->vc_x; 2610 if (c == 10 || c == 13) 2611 continue; 2612 } 2613 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos); 2614 notify_write(vc, c); 2615 cnt++; 2616 if (myx == vc->vc_cols - 1) { 2617 vc->vc_need_wrap = 1; 2618 continue; 2619 } 2620 vc->vc_pos += 2; 2621 myx++; 2622 } 2623 if (cnt > 0) { 2624 if (con_is_visible(vc)) 2625 vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x); 2626 vc->vc_x += cnt; 2627 if (vc->vc_x == vc->vc_cols) { 2628 vc->vc_x--; 2629 vc->vc_need_wrap = 1; 2630 } 2631 } 2632 set_cursor(vc); 2633 notify_update(vc); 2634 2635 quit: 2636 spin_unlock(&printing_lock); 2637 } 2638 2639 static struct tty_driver *vt_console_device(struct console *c, int *index) 2640 { 2641 *index = c->index ? c->index-1 : fg_console; 2642 return console_driver; 2643 } 2644 2645 static struct console vt_console_driver = { 2646 .name = "tty", 2647 .write = vt_console_print, 2648 .device = vt_console_device, 2649 .unblank = unblank_screen, 2650 .flags = CON_PRINTBUFFER, 2651 .index = -1, 2652 }; 2653 #endif 2654 2655 /* 2656 * Handling of Linux-specific VC ioctls 2657 */ 2658 2659 /* 2660 * Generally a bit racy with respect to console_lock();. 2661 * 2662 * There are some functions which don't need it. 2663 * 2664 * There are some functions which can sleep for arbitrary periods 2665 * (paste_selection) but we don't need the lock there anyway. 2666 * 2667 * set_selection has locking, and definitely needs it 2668 */ 2669 2670 int tioclinux(struct tty_struct *tty, unsigned long arg) 2671 { 2672 char type, data; 2673 char __user *p = (char __user *)arg; 2674 int lines; 2675 int ret; 2676 2677 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN)) 2678 return -EPERM; 2679 if (get_user(type, p)) 2680 return -EFAULT; 2681 ret = 0; 2682 2683 switch (type) 2684 { 2685 case TIOCL_SETSEL: 2686 console_lock(); 2687 ret = set_selection((struct tiocl_selection __user *)(p+1), tty); 2688 console_unlock(); 2689 break; 2690 case TIOCL_PASTESEL: 2691 ret = paste_selection(tty); 2692 break; 2693 case TIOCL_UNBLANKSCREEN: 2694 console_lock(); 2695 unblank_screen(); 2696 console_unlock(); 2697 break; 2698 case TIOCL_SELLOADLUT: 2699 console_lock(); 2700 ret = sel_loadlut(p); 2701 console_unlock(); 2702 break; 2703 case TIOCL_GETSHIFTSTATE: 2704 2705 /* 2706 * Make it possible to react to Shift+Mousebutton. 2707 * Note that 'shift_state' is an undocumented 2708 * kernel-internal variable; programs not closely 2709 * related to the kernel should not use this. 2710 */ 2711 data = vt_get_shift_state(); 2712 ret = put_user(data, p); 2713 break; 2714 case TIOCL_GETMOUSEREPORTING: 2715 console_lock(); /* May be overkill */ 2716 data = mouse_reporting(); 2717 console_unlock(); 2718 ret = put_user(data, p); 2719 break; 2720 case TIOCL_SETVESABLANK: 2721 console_lock(); 2722 ret = set_vesa_blanking(p); 2723 console_unlock(); 2724 break; 2725 case TIOCL_GETKMSGREDIRECT: 2726 data = vt_get_kmsg_redirect(); 2727 ret = put_user(data, p); 2728 break; 2729 case TIOCL_SETKMSGREDIRECT: 2730 if (!capable(CAP_SYS_ADMIN)) { 2731 ret = -EPERM; 2732 } else { 2733 if (get_user(data, p+1)) 2734 ret = -EFAULT; 2735 else 2736 vt_kmsg_redirect(data); 2737 } 2738 break; 2739 case TIOCL_GETFGCONSOLE: 2740 /* No locking needed as this is a transiently 2741 correct return anyway if the caller hasn't 2742 disabled switching */ 2743 ret = fg_console; 2744 break; 2745 case TIOCL_SCROLLCONSOLE: 2746 if (get_user(lines, (s32 __user *)(p+4))) { 2747 ret = -EFAULT; 2748 } else { 2749 /* Need the console lock here. Note that lots 2750 of other calls need fixing before the lock 2751 is actually useful ! */ 2752 console_lock(); 2753 scrollfront(vc_cons[fg_console].d, lines); 2754 console_unlock(); 2755 ret = 0; 2756 } 2757 break; 2758 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */ 2759 console_lock(); 2760 ignore_poke = 1; 2761 do_blank_screen(0); 2762 console_unlock(); 2763 break; 2764 case TIOCL_BLANKEDSCREEN: 2765 ret = console_blanked; 2766 break; 2767 default: 2768 ret = -EINVAL; 2769 break; 2770 } 2771 return ret; 2772 } 2773 2774 /* 2775 * /dev/ttyN handling 2776 */ 2777 2778 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count) 2779 { 2780 int retval; 2781 2782 retval = do_con_write(tty, buf, count); 2783 con_flush_chars(tty); 2784 2785 return retval; 2786 } 2787 2788 static int con_put_char(struct tty_struct *tty, unsigned char ch) 2789 { 2790 if (in_interrupt()) 2791 return 0; /* n_r3964 calls put_char() from interrupt context */ 2792 return do_con_write(tty, &ch, 1); 2793 } 2794 2795 static int con_write_room(struct tty_struct *tty) 2796 { 2797 if (tty->stopped) 2798 return 0; 2799 return 32768; /* No limit, really; we're not buffering */ 2800 } 2801 2802 static int con_chars_in_buffer(struct tty_struct *tty) 2803 { 2804 return 0; /* we're not buffering */ 2805 } 2806 2807 /* 2808 * con_throttle and con_unthrottle are only used for 2809 * paste_selection(), which has to stuff in a large number of 2810 * characters... 2811 */ 2812 static void con_throttle(struct tty_struct *tty) 2813 { 2814 } 2815 2816 static void con_unthrottle(struct tty_struct *tty) 2817 { 2818 struct vc_data *vc = tty->driver_data; 2819 2820 wake_up_interruptible(&vc->paste_wait); 2821 } 2822 2823 /* 2824 * Turn the Scroll-Lock LED on when the tty is stopped 2825 */ 2826 static void con_stop(struct tty_struct *tty) 2827 { 2828 int console_num; 2829 if (!tty) 2830 return; 2831 console_num = tty->index; 2832 if (!vc_cons_allocated(console_num)) 2833 return; 2834 vt_kbd_con_stop(console_num); 2835 } 2836 2837 /* 2838 * Turn the Scroll-Lock LED off when the console is started 2839 */ 2840 static void con_start(struct tty_struct *tty) 2841 { 2842 int console_num; 2843 if (!tty) 2844 return; 2845 console_num = tty->index; 2846 if (!vc_cons_allocated(console_num)) 2847 return; 2848 vt_kbd_con_start(console_num); 2849 } 2850 2851 static void con_flush_chars(struct tty_struct *tty) 2852 { 2853 struct vc_data *vc; 2854 2855 if (in_interrupt()) /* from flush_to_ldisc */ 2856 return; 2857 2858 /* if we race with con_close(), vt may be null */ 2859 console_lock(); 2860 vc = tty->driver_data; 2861 if (vc) 2862 set_cursor(vc); 2863 console_unlock(); 2864 } 2865 2866 /* 2867 * Allocate the console screen memory. 2868 */ 2869 static int con_install(struct tty_driver *driver, struct tty_struct *tty) 2870 { 2871 unsigned int currcons = tty->index; 2872 struct vc_data *vc; 2873 int ret; 2874 2875 console_lock(); 2876 ret = vc_allocate(currcons); 2877 if (ret) 2878 goto unlock; 2879 2880 vc = vc_cons[currcons].d; 2881 2882 /* Still being freed */ 2883 if (vc->port.tty) { 2884 ret = -ERESTARTSYS; 2885 goto unlock; 2886 } 2887 2888 ret = tty_port_install(&vc->port, driver, tty); 2889 if (ret) 2890 goto unlock; 2891 2892 tty->driver_data = vc; 2893 vc->port.tty = tty; 2894 2895 if (!tty->winsize.ws_row && !tty->winsize.ws_col) { 2896 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows; 2897 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols; 2898 } 2899 if (vc->vc_utf) 2900 tty->termios.c_iflag |= IUTF8; 2901 else 2902 tty->termios.c_iflag &= ~IUTF8; 2903 unlock: 2904 console_unlock(); 2905 return ret; 2906 } 2907 2908 static int con_open(struct tty_struct *tty, struct file *filp) 2909 { 2910 /* everything done in install */ 2911 return 0; 2912 } 2913 2914 2915 static void con_close(struct tty_struct *tty, struct file *filp) 2916 { 2917 /* Nothing to do - we defer to shutdown */ 2918 } 2919 2920 static void con_shutdown(struct tty_struct *tty) 2921 { 2922 struct vc_data *vc = tty->driver_data; 2923 BUG_ON(vc == NULL); 2924 console_lock(); 2925 vc->port.tty = NULL; 2926 console_unlock(); 2927 } 2928 2929 static int default_color = 7; /* white */ 2930 static int default_italic_color = 2; // green (ASCII) 2931 static int default_underline_color = 3; // cyan (ASCII) 2932 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR); 2933 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR); 2934 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR); 2935 2936 static void vc_init(struct vc_data *vc, unsigned int rows, 2937 unsigned int cols, int do_clear) 2938 { 2939 int j, k ; 2940 2941 vc->vc_cols = cols; 2942 vc->vc_rows = rows; 2943 vc->vc_size_row = cols << 1; 2944 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row; 2945 2946 set_origin(vc); 2947 vc->vc_pos = vc->vc_origin; 2948 reset_vc(vc); 2949 for (j=k=0; j<16; j++) { 2950 vc->vc_palette[k++] = default_red[j] ; 2951 vc->vc_palette[k++] = default_grn[j] ; 2952 vc->vc_palette[k++] = default_blu[j] ; 2953 } 2954 vc->vc_def_color = default_color; 2955 vc->vc_ulcolor = default_underline_color; 2956 vc->vc_itcolor = default_italic_color; 2957 vc->vc_halfcolor = 0x08; /* grey */ 2958 init_waitqueue_head(&vc->paste_wait); 2959 reset_terminal(vc, do_clear); 2960 } 2961 2962 /* 2963 * This routine initializes console interrupts, and does nothing 2964 * else. If you want the screen to clear, call tty_write with 2965 * the appropriate escape-sequence. 2966 */ 2967 2968 static int __init con_init(void) 2969 { 2970 const char *display_desc = NULL; 2971 struct vc_data *vc; 2972 unsigned int currcons = 0, i; 2973 2974 console_lock(); 2975 2976 if (conswitchp) 2977 display_desc = conswitchp->con_startup(); 2978 if (!display_desc) { 2979 fg_console = 0; 2980 console_unlock(); 2981 return 0; 2982 } 2983 2984 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 2985 struct con_driver *con_driver = ®istered_con_driver[i]; 2986 2987 if (con_driver->con == NULL) { 2988 con_driver->con = conswitchp; 2989 con_driver->desc = display_desc; 2990 con_driver->flag = CON_DRIVER_FLAG_INIT; 2991 con_driver->first = 0; 2992 con_driver->last = MAX_NR_CONSOLES - 1; 2993 break; 2994 } 2995 } 2996 2997 for (i = 0; i < MAX_NR_CONSOLES; i++) 2998 con_driver_map[i] = conswitchp; 2999 3000 if (blankinterval) { 3001 blank_state = blank_normal_wait; 3002 mod_timer(&console_timer, jiffies + (blankinterval * HZ)); 3003 } 3004 3005 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) { 3006 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT); 3007 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK); 3008 tty_port_init(&vc->port); 3009 visual_init(vc, currcons, 1); 3010 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT); 3011 vc_init(vc, vc->vc_rows, vc->vc_cols, 3012 currcons || !vc->vc_sw->con_save_screen); 3013 } 3014 currcons = fg_console = 0; 3015 master_display_fg = vc = vc_cons[currcons].d; 3016 set_origin(vc); 3017 save_screen(vc); 3018 gotoxy(vc, vc->vc_x, vc->vc_y); 3019 csi_J(vc, 0); 3020 update_screen(vc); 3021 pr_info("Console: %s %s %dx%d\n", 3022 vc->vc_can_do_color ? "colour" : "mono", 3023 display_desc, vc->vc_cols, vc->vc_rows); 3024 printable = 1; 3025 3026 console_unlock(); 3027 3028 #ifdef CONFIG_VT_CONSOLE 3029 register_console(&vt_console_driver); 3030 #endif 3031 return 0; 3032 } 3033 console_initcall(con_init); 3034 3035 static const struct tty_operations con_ops = { 3036 .install = con_install, 3037 .open = con_open, 3038 .close = con_close, 3039 .write = con_write, 3040 .write_room = con_write_room, 3041 .put_char = con_put_char, 3042 .flush_chars = con_flush_chars, 3043 .chars_in_buffer = con_chars_in_buffer, 3044 .ioctl = vt_ioctl, 3045 #ifdef CONFIG_COMPAT 3046 .compat_ioctl = vt_compat_ioctl, 3047 #endif 3048 .stop = con_stop, 3049 .start = con_start, 3050 .throttle = con_throttle, 3051 .unthrottle = con_unthrottle, 3052 .resize = vt_resize, 3053 .shutdown = con_shutdown 3054 }; 3055 3056 static struct cdev vc0_cdev; 3057 3058 static ssize_t show_tty_active(struct device *dev, 3059 struct device_attribute *attr, char *buf) 3060 { 3061 return sprintf(buf, "tty%d\n", fg_console + 1); 3062 } 3063 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL); 3064 3065 static struct attribute *vt_dev_attrs[] = { 3066 &dev_attr_active.attr, 3067 NULL 3068 }; 3069 3070 ATTRIBUTE_GROUPS(vt_dev); 3071 3072 int __init vty_init(const struct file_operations *console_fops) 3073 { 3074 cdev_init(&vc0_cdev, console_fops); 3075 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) || 3076 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0) 3077 panic("Couldn't register /dev/tty0 driver\n"); 3078 tty0dev = device_create_with_groups(tty_class, NULL, 3079 MKDEV(TTY_MAJOR, 0), NULL, 3080 vt_dev_groups, "tty0"); 3081 if (IS_ERR(tty0dev)) 3082 tty0dev = NULL; 3083 3084 vcs_init(); 3085 3086 console_driver = alloc_tty_driver(MAX_NR_CONSOLES); 3087 if (!console_driver) 3088 panic("Couldn't allocate console driver\n"); 3089 3090 console_driver->name = "tty"; 3091 console_driver->name_base = 1; 3092 console_driver->major = TTY_MAJOR; 3093 console_driver->minor_start = 1; 3094 console_driver->type = TTY_DRIVER_TYPE_CONSOLE; 3095 console_driver->init_termios = tty_std_termios; 3096 if (default_utf8) 3097 console_driver->init_termios.c_iflag |= IUTF8; 3098 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS; 3099 tty_set_operations(console_driver, &con_ops); 3100 if (tty_register_driver(console_driver)) 3101 panic("Couldn't register console driver\n"); 3102 kbd_init(); 3103 console_map_init(); 3104 #ifdef CONFIG_MDA_CONSOLE 3105 mda_console_init(); 3106 #endif 3107 return 0; 3108 } 3109 3110 #ifndef VT_SINGLE_DRIVER 3111 3112 static struct class *vtconsole_class; 3113 3114 static int do_bind_con_driver(const struct consw *csw, int first, int last, 3115 int deflt) 3116 { 3117 struct module *owner = csw->owner; 3118 const char *desc = NULL; 3119 struct con_driver *con_driver; 3120 int i, j = -1, k = -1, retval = -ENODEV; 3121 3122 if (!try_module_get(owner)) 3123 return -ENODEV; 3124 3125 WARN_CONSOLE_UNLOCKED(); 3126 3127 /* check if driver is registered */ 3128 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 3129 con_driver = ®istered_con_driver[i]; 3130 3131 if (con_driver->con == csw) { 3132 desc = con_driver->desc; 3133 retval = 0; 3134 break; 3135 } 3136 } 3137 3138 if (retval) 3139 goto err; 3140 3141 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) { 3142 csw->con_startup(); 3143 con_driver->flag |= CON_DRIVER_FLAG_INIT; 3144 } 3145 3146 if (deflt) { 3147 if (conswitchp) 3148 module_put(conswitchp->owner); 3149 3150 __module_get(owner); 3151 conswitchp = csw; 3152 } 3153 3154 first = max(first, con_driver->first); 3155 last = min(last, con_driver->last); 3156 3157 for (i = first; i <= last; i++) { 3158 int old_was_color; 3159 struct vc_data *vc = vc_cons[i].d; 3160 3161 if (con_driver_map[i]) 3162 module_put(con_driver_map[i]->owner); 3163 __module_get(owner); 3164 con_driver_map[i] = csw; 3165 3166 if (!vc || !vc->vc_sw) 3167 continue; 3168 3169 j = i; 3170 3171 if (con_is_visible(vc)) { 3172 k = i; 3173 save_screen(vc); 3174 } 3175 3176 old_was_color = vc->vc_can_do_color; 3177 vc->vc_sw->con_deinit(vc); 3178 vc->vc_origin = (unsigned long)vc->vc_screenbuf; 3179 visual_init(vc, i, 0); 3180 set_origin(vc); 3181 update_attr(vc); 3182 3183 /* If the console changed between mono <-> color, then 3184 * the attributes in the screenbuf will be wrong. The 3185 * following resets all attributes to something sane. 3186 */ 3187 if (old_was_color != vc->vc_can_do_color) 3188 clear_buffer_attributes(vc); 3189 } 3190 3191 pr_info("Console: switching "); 3192 if (!deflt) 3193 pr_cont("consoles %d-%d ", first + 1, last + 1); 3194 if (j >= 0) { 3195 struct vc_data *vc = vc_cons[j].d; 3196 3197 pr_cont("to %s %s %dx%d\n", 3198 vc->vc_can_do_color ? "colour" : "mono", 3199 desc, vc->vc_cols, vc->vc_rows); 3200 3201 if (k >= 0) { 3202 vc = vc_cons[k].d; 3203 update_screen(vc); 3204 } 3205 } else { 3206 pr_cont("to %s\n", desc); 3207 } 3208 3209 retval = 0; 3210 err: 3211 module_put(owner); 3212 return retval; 3213 }; 3214 3215 3216 #ifdef CONFIG_VT_HW_CONSOLE_BINDING 3217 /* unlocked version of unbind_con_driver() */ 3218 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt) 3219 { 3220 struct module *owner = csw->owner; 3221 const struct consw *defcsw = NULL; 3222 struct con_driver *con_driver = NULL, *con_back = NULL; 3223 int i, retval = -ENODEV; 3224 3225 if (!try_module_get(owner)) 3226 return -ENODEV; 3227 3228 WARN_CONSOLE_UNLOCKED(); 3229 3230 /* check if driver is registered and if it is unbindable */ 3231 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 3232 con_driver = ®istered_con_driver[i]; 3233 3234 if (con_driver->con == csw && 3235 con_driver->flag & CON_DRIVER_FLAG_MODULE) { 3236 retval = 0; 3237 break; 3238 } 3239 } 3240 3241 if (retval) 3242 goto err; 3243 3244 retval = -ENODEV; 3245 3246 /* check if backup driver exists */ 3247 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 3248 con_back = ®istered_con_driver[i]; 3249 3250 if (con_back->con && con_back->con != csw) { 3251 defcsw = con_back->con; 3252 retval = 0; 3253 break; 3254 } 3255 } 3256 3257 if (retval) 3258 goto err; 3259 3260 if (!con_is_bound(csw)) 3261 goto err; 3262 3263 first = max(first, con_driver->first); 3264 last = min(last, con_driver->last); 3265 3266 for (i = first; i <= last; i++) { 3267 if (con_driver_map[i] == csw) { 3268 module_put(csw->owner); 3269 con_driver_map[i] = NULL; 3270 } 3271 } 3272 3273 if (!con_is_bound(defcsw)) { 3274 const struct consw *defconsw = conswitchp; 3275 3276 defcsw->con_startup(); 3277 con_back->flag |= CON_DRIVER_FLAG_INIT; 3278 /* 3279 * vgacon may change the default driver to point 3280 * to dummycon, we restore it here... 3281 */ 3282 conswitchp = defconsw; 3283 } 3284 3285 if (!con_is_bound(csw)) 3286 con_driver->flag &= ~CON_DRIVER_FLAG_INIT; 3287 3288 /* ignore return value, binding should not fail */ 3289 do_bind_con_driver(defcsw, first, last, deflt); 3290 err: 3291 module_put(owner); 3292 return retval; 3293 3294 } 3295 EXPORT_SYMBOL_GPL(do_unbind_con_driver); 3296 3297 static int vt_bind(struct con_driver *con) 3298 { 3299 const struct consw *defcsw = NULL, *csw = NULL; 3300 int i, more = 1, first = -1, last = -1, deflt = 0; 3301 3302 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE)) 3303 goto err; 3304 3305 csw = con->con; 3306 3307 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 3308 struct con_driver *con = ®istered_con_driver[i]; 3309 3310 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) { 3311 defcsw = con->con; 3312 break; 3313 } 3314 } 3315 3316 if (!defcsw) 3317 goto err; 3318 3319 while (more) { 3320 more = 0; 3321 3322 for (i = con->first; i <= con->last; i++) { 3323 if (con_driver_map[i] == defcsw) { 3324 if (first == -1) 3325 first = i; 3326 last = i; 3327 more = 1; 3328 } else if (first != -1) 3329 break; 3330 } 3331 3332 if (first == 0 && last == MAX_NR_CONSOLES -1) 3333 deflt = 1; 3334 3335 if (first != -1) 3336 do_bind_con_driver(csw, first, last, deflt); 3337 3338 first = -1; 3339 last = -1; 3340 deflt = 0; 3341 } 3342 3343 err: 3344 return 0; 3345 } 3346 3347 static int vt_unbind(struct con_driver *con) 3348 { 3349 const struct consw *csw = NULL; 3350 int i, more = 1, first = -1, last = -1, deflt = 0; 3351 int ret; 3352 3353 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE)) 3354 goto err; 3355 3356 csw = con->con; 3357 3358 while (more) { 3359 more = 0; 3360 3361 for (i = con->first; i <= con->last; i++) { 3362 if (con_driver_map[i] == csw) { 3363 if (first == -1) 3364 first = i; 3365 last = i; 3366 more = 1; 3367 } else if (first != -1) 3368 break; 3369 } 3370 3371 if (first == 0 && last == MAX_NR_CONSOLES -1) 3372 deflt = 1; 3373 3374 if (first != -1) { 3375 ret = do_unbind_con_driver(csw, first, last, deflt); 3376 if (ret != 0) 3377 return ret; 3378 } 3379 3380 first = -1; 3381 last = -1; 3382 deflt = 0; 3383 } 3384 3385 err: 3386 return 0; 3387 } 3388 #else 3389 static inline int vt_bind(struct con_driver *con) 3390 { 3391 return 0; 3392 } 3393 static inline int vt_unbind(struct con_driver *con) 3394 { 3395 return 0; 3396 } 3397 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */ 3398 3399 static ssize_t store_bind(struct device *dev, struct device_attribute *attr, 3400 const char *buf, size_t count) 3401 { 3402 struct con_driver *con = dev_get_drvdata(dev); 3403 int bind = simple_strtoul(buf, NULL, 0); 3404 3405 console_lock(); 3406 3407 if (bind) 3408 vt_bind(con); 3409 else 3410 vt_unbind(con); 3411 3412 console_unlock(); 3413 3414 return count; 3415 } 3416 3417 static ssize_t show_bind(struct device *dev, struct device_attribute *attr, 3418 char *buf) 3419 { 3420 struct con_driver *con = dev_get_drvdata(dev); 3421 int bind = con_is_bound(con->con); 3422 3423 return snprintf(buf, PAGE_SIZE, "%i\n", bind); 3424 } 3425 3426 static ssize_t show_name(struct device *dev, struct device_attribute *attr, 3427 char *buf) 3428 { 3429 struct con_driver *con = dev_get_drvdata(dev); 3430 3431 return snprintf(buf, PAGE_SIZE, "%s %s\n", 3432 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)", 3433 con->desc); 3434 3435 } 3436 3437 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind); 3438 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 3439 3440 static struct attribute *con_dev_attrs[] = { 3441 &dev_attr_bind.attr, 3442 &dev_attr_name.attr, 3443 NULL 3444 }; 3445 3446 ATTRIBUTE_GROUPS(con_dev); 3447 3448 static int vtconsole_init_device(struct con_driver *con) 3449 { 3450 con->flag |= CON_DRIVER_FLAG_ATTR; 3451 return 0; 3452 } 3453 3454 static void vtconsole_deinit_device(struct con_driver *con) 3455 { 3456 con->flag &= ~CON_DRIVER_FLAG_ATTR; 3457 } 3458 3459 /** 3460 * con_is_bound - checks if driver is bound to the console 3461 * @csw: console driver 3462 * 3463 * RETURNS: zero if unbound, nonzero if bound 3464 * 3465 * Drivers can call this and if zero, they should release 3466 * all resources allocated on con_startup() 3467 */ 3468 int con_is_bound(const struct consw *csw) 3469 { 3470 int i, bound = 0; 3471 3472 for (i = 0; i < MAX_NR_CONSOLES; i++) { 3473 if (con_driver_map[i] == csw) { 3474 bound = 1; 3475 break; 3476 } 3477 } 3478 3479 return bound; 3480 } 3481 EXPORT_SYMBOL(con_is_bound); 3482 3483 /** 3484 * con_debug_enter - prepare the console for the kernel debugger 3485 * @sw: console driver 3486 * 3487 * Called when the console is taken over by the kernel debugger, this 3488 * function needs to save the current console state, then put the console 3489 * into a state suitable for the kernel debugger. 3490 * 3491 * RETURNS: 3492 * Zero on success, nonzero if a failure occurred when trying to prepare 3493 * the console for the debugger. 3494 */ 3495 int con_debug_enter(struct vc_data *vc) 3496 { 3497 int ret = 0; 3498 3499 saved_fg_console = fg_console; 3500 saved_last_console = last_console; 3501 saved_want_console = want_console; 3502 saved_vc_mode = vc->vc_mode; 3503 saved_console_blanked = console_blanked; 3504 vc->vc_mode = KD_TEXT; 3505 console_blanked = 0; 3506 if (vc->vc_sw->con_debug_enter) 3507 ret = vc->vc_sw->con_debug_enter(vc); 3508 #ifdef CONFIG_KGDB_KDB 3509 /* Set the initial LINES variable if it is not already set */ 3510 if (vc->vc_rows < 999) { 3511 int linecount; 3512 char lns[4]; 3513 const char *setargs[3] = { 3514 "set", 3515 "LINES", 3516 lns, 3517 }; 3518 if (kdbgetintenv(setargs[0], &linecount)) { 3519 snprintf(lns, 4, "%i", vc->vc_rows); 3520 kdb_set(2, setargs); 3521 } 3522 } 3523 if (vc->vc_cols < 999) { 3524 int colcount; 3525 char cols[4]; 3526 const char *setargs[3] = { 3527 "set", 3528 "COLUMNS", 3529 cols, 3530 }; 3531 if (kdbgetintenv(setargs[0], &colcount)) { 3532 snprintf(cols, 4, "%i", vc->vc_cols); 3533 kdb_set(2, setargs); 3534 } 3535 } 3536 #endif /* CONFIG_KGDB_KDB */ 3537 return ret; 3538 } 3539 EXPORT_SYMBOL_GPL(con_debug_enter); 3540 3541 /** 3542 * con_debug_leave - restore console state 3543 * @sw: console driver 3544 * 3545 * Restore the console state to what it was before the kernel debugger 3546 * was invoked. 3547 * 3548 * RETURNS: 3549 * Zero on success, nonzero if a failure occurred when trying to restore 3550 * the console. 3551 */ 3552 int con_debug_leave(void) 3553 { 3554 struct vc_data *vc; 3555 int ret = 0; 3556 3557 fg_console = saved_fg_console; 3558 last_console = saved_last_console; 3559 want_console = saved_want_console; 3560 console_blanked = saved_console_blanked; 3561 vc_cons[fg_console].d->vc_mode = saved_vc_mode; 3562 3563 vc = vc_cons[fg_console].d; 3564 if (vc->vc_sw->con_debug_leave) 3565 ret = vc->vc_sw->con_debug_leave(vc); 3566 return ret; 3567 } 3568 EXPORT_SYMBOL_GPL(con_debug_leave); 3569 3570 static int do_register_con_driver(const struct consw *csw, int first, int last) 3571 { 3572 struct module *owner = csw->owner; 3573 struct con_driver *con_driver; 3574 const char *desc; 3575 int i, retval; 3576 3577 WARN_CONSOLE_UNLOCKED(); 3578 3579 if (!try_module_get(owner)) 3580 return -ENODEV; 3581 3582 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 3583 con_driver = ®istered_con_driver[i]; 3584 3585 /* already registered */ 3586 if (con_driver->con == csw) { 3587 retval = -EBUSY; 3588 goto err; 3589 } 3590 } 3591 3592 desc = csw->con_startup(); 3593 if (!desc) { 3594 retval = -ENODEV; 3595 goto err; 3596 } 3597 3598 retval = -EINVAL; 3599 3600 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 3601 con_driver = ®istered_con_driver[i]; 3602 3603 if (con_driver->con == NULL && 3604 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) { 3605 con_driver->con = csw; 3606 con_driver->desc = desc; 3607 con_driver->node = i; 3608 con_driver->flag = CON_DRIVER_FLAG_MODULE | 3609 CON_DRIVER_FLAG_INIT; 3610 con_driver->first = first; 3611 con_driver->last = last; 3612 retval = 0; 3613 break; 3614 } 3615 } 3616 3617 if (retval) 3618 goto err; 3619 3620 con_driver->dev = 3621 device_create_with_groups(vtconsole_class, NULL, 3622 MKDEV(0, con_driver->node), 3623 con_driver, con_dev_groups, 3624 "vtcon%i", con_driver->node); 3625 if (IS_ERR(con_driver->dev)) { 3626 pr_warn("Unable to create device for %s; errno = %ld\n", 3627 con_driver->desc, PTR_ERR(con_driver->dev)); 3628 con_driver->dev = NULL; 3629 } else { 3630 vtconsole_init_device(con_driver); 3631 } 3632 3633 err: 3634 module_put(owner); 3635 return retval; 3636 } 3637 3638 3639 /** 3640 * do_unregister_con_driver - unregister console driver from console layer 3641 * @csw: console driver 3642 * 3643 * DESCRIPTION: All drivers that registers to the console layer must 3644 * call this function upon exit, or if the console driver is in a state 3645 * where it won't be able to handle console services, such as the 3646 * framebuffer console without loaded framebuffer drivers. 3647 * 3648 * The driver must unbind first prior to unregistration. 3649 */ 3650 int do_unregister_con_driver(const struct consw *csw) 3651 { 3652 int i; 3653 3654 /* cannot unregister a bound driver */ 3655 if (con_is_bound(csw)) 3656 return -EBUSY; 3657 3658 if (csw == conswitchp) 3659 return -EINVAL; 3660 3661 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 3662 struct con_driver *con_driver = ®istered_con_driver[i]; 3663 3664 if (con_driver->con == csw) { 3665 /* 3666 * Defer the removal of the sysfs entries since that 3667 * will acquire the kernfs s_active lock and we can't 3668 * acquire this lock while holding the console lock: 3669 * the unbind sysfs entry imposes already the opposite 3670 * order. Reset con already here to prevent any later 3671 * lookup to succeed and mark this slot as zombie, so 3672 * it won't get reused until we complete the removal 3673 * in the deferred work. 3674 */ 3675 con_driver->con = NULL; 3676 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE; 3677 schedule_work(&con_driver_unregister_work); 3678 3679 return 0; 3680 } 3681 } 3682 3683 return -ENODEV; 3684 } 3685 EXPORT_SYMBOL_GPL(do_unregister_con_driver); 3686 3687 static void con_driver_unregister_callback(struct work_struct *ignored) 3688 { 3689 int i; 3690 3691 console_lock(); 3692 3693 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 3694 struct con_driver *con_driver = ®istered_con_driver[i]; 3695 3696 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) 3697 continue; 3698 3699 console_unlock(); 3700 3701 vtconsole_deinit_device(con_driver); 3702 device_destroy(vtconsole_class, MKDEV(0, con_driver->node)); 3703 3704 console_lock(); 3705 3706 if (WARN_ON_ONCE(con_driver->con)) 3707 con_driver->con = NULL; 3708 con_driver->desc = NULL; 3709 con_driver->dev = NULL; 3710 con_driver->node = 0; 3711 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE); 3712 con_driver->flag = 0; 3713 con_driver->first = 0; 3714 con_driver->last = 0; 3715 } 3716 3717 console_unlock(); 3718 } 3719 3720 /* 3721 * If we support more console drivers, this function is used 3722 * when a driver wants to take over some existing consoles 3723 * and become default driver for newly opened ones. 3724 * 3725 * do_take_over_console is basically a register followed by unbind 3726 */ 3727 int do_take_over_console(const struct consw *csw, int first, int last, int deflt) 3728 { 3729 int err; 3730 3731 err = do_register_con_driver(csw, first, last); 3732 /* 3733 * If we get an busy error we still want to bind the console driver 3734 * and return success, as we may have unbound the console driver 3735 * but not unregistered it. 3736 */ 3737 if (err == -EBUSY) 3738 err = 0; 3739 if (!err) 3740 do_bind_con_driver(csw, first, last, deflt); 3741 3742 return err; 3743 } 3744 EXPORT_SYMBOL_GPL(do_take_over_console); 3745 3746 3747 /* 3748 * give_up_console is a wrapper to unregister_con_driver. It will only 3749 * work if driver is fully unbound. 3750 */ 3751 void give_up_console(const struct consw *csw) 3752 { 3753 console_lock(); 3754 do_unregister_con_driver(csw); 3755 console_unlock(); 3756 } 3757 3758 static int __init vtconsole_class_init(void) 3759 { 3760 int i; 3761 3762 vtconsole_class = class_create(THIS_MODULE, "vtconsole"); 3763 if (IS_ERR(vtconsole_class)) { 3764 pr_warn("Unable to create vt console class; errno = %ld\n", 3765 PTR_ERR(vtconsole_class)); 3766 vtconsole_class = NULL; 3767 } 3768 3769 /* Add system drivers to sysfs */ 3770 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 3771 struct con_driver *con = ®istered_con_driver[i]; 3772 3773 if (con->con && !con->dev) { 3774 con->dev = 3775 device_create_with_groups(vtconsole_class, NULL, 3776 MKDEV(0, con->node), 3777 con, con_dev_groups, 3778 "vtcon%i", con->node); 3779 3780 if (IS_ERR(con->dev)) { 3781 pr_warn("Unable to create device for %s; errno = %ld\n", 3782 con->desc, PTR_ERR(con->dev)); 3783 con->dev = NULL; 3784 } else { 3785 vtconsole_init_device(con); 3786 } 3787 } 3788 } 3789 3790 return 0; 3791 } 3792 postcore_initcall(vtconsole_class_init); 3793 3794 #endif 3795 3796 /* 3797 * Screen blanking 3798 */ 3799 3800 static int set_vesa_blanking(char __user *p) 3801 { 3802 unsigned int mode; 3803 3804 if (get_user(mode, p + 1)) 3805 return -EFAULT; 3806 3807 vesa_blank_mode = (mode < 4) ? mode : 0; 3808 return 0; 3809 } 3810 3811 void do_blank_screen(int entering_gfx) 3812 { 3813 struct vc_data *vc = vc_cons[fg_console].d; 3814 int i; 3815 3816 WARN_CONSOLE_UNLOCKED(); 3817 3818 if (console_blanked) { 3819 if (blank_state == blank_vesa_wait) { 3820 blank_state = blank_off; 3821 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0); 3822 } 3823 return; 3824 } 3825 3826 /* entering graphics mode? */ 3827 if (entering_gfx) { 3828 hide_cursor(vc); 3829 save_screen(vc); 3830 vc->vc_sw->con_blank(vc, -1, 1); 3831 console_blanked = fg_console + 1; 3832 blank_state = blank_off; 3833 set_origin(vc); 3834 return; 3835 } 3836 3837 if (blank_state != blank_normal_wait) 3838 return; 3839 blank_state = blank_off; 3840 3841 /* don't blank graphics */ 3842 if (vc->vc_mode != KD_TEXT) { 3843 console_blanked = fg_console + 1; 3844 return; 3845 } 3846 3847 hide_cursor(vc); 3848 del_timer_sync(&console_timer); 3849 blank_timer_expired = 0; 3850 3851 save_screen(vc); 3852 /* In case we need to reset origin, blanking hook returns 1 */ 3853 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0); 3854 console_blanked = fg_console + 1; 3855 if (i) 3856 set_origin(vc); 3857 3858 if (console_blank_hook && console_blank_hook(1)) 3859 return; 3860 3861 if (vesa_off_interval && vesa_blank_mode) { 3862 blank_state = blank_vesa_wait; 3863 mod_timer(&console_timer, jiffies + vesa_off_interval); 3864 } 3865 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num); 3866 } 3867 EXPORT_SYMBOL(do_blank_screen); 3868 3869 /* 3870 * Called by timer as well as from vt_console_driver 3871 */ 3872 void do_unblank_screen(int leaving_gfx) 3873 { 3874 struct vc_data *vc; 3875 3876 /* This should now always be called from a "sane" (read: can schedule) 3877 * context for the sake of the low level drivers, except in the special 3878 * case of oops_in_progress 3879 */ 3880 if (!oops_in_progress) 3881 might_sleep(); 3882 3883 WARN_CONSOLE_UNLOCKED(); 3884 3885 ignore_poke = 0; 3886 if (!console_blanked) 3887 return; 3888 if (!vc_cons_allocated(fg_console)) { 3889 /* impossible */ 3890 pr_warn("unblank_screen: tty %d not allocated ??\n", 3891 fg_console + 1); 3892 return; 3893 } 3894 vc = vc_cons[fg_console].d; 3895 /* Try to unblank in oops case too */ 3896 if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc)) 3897 return; /* but leave console_blanked != 0 */ 3898 3899 if (blankinterval) { 3900 mod_timer(&console_timer, jiffies + (blankinterval * HZ)); 3901 blank_state = blank_normal_wait; 3902 } 3903 3904 console_blanked = 0; 3905 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc)) 3906 /* Low-level driver cannot restore -> do it ourselves */ 3907 update_screen(vc); 3908 if (console_blank_hook) 3909 console_blank_hook(0); 3910 set_palette(vc); 3911 set_cursor(vc); 3912 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num); 3913 } 3914 EXPORT_SYMBOL(do_unblank_screen); 3915 3916 /* 3917 * This is called by the outside world to cause a forced unblank, mostly for 3918 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually 3919 * call it with 1 as an argument and so force a mode restore... that may kill 3920 * X or at least garbage the screen but would also make the Oops visible... 3921 */ 3922 void unblank_screen(void) 3923 { 3924 do_unblank_screen(0); 3925 } 3926 3927 /* 3928 * We defer the timer blanking to work queue so it can take the console mutex 3929 * (console operations can still happen at irq time, but only from printk which 3930 * has the console mutex. Not perfect yet, but better than no locking 3931 */ 3932 static void blank_screen_t(struct timer_list *unused) 3933 { 3934 blank_timer_expired = 1; 3935 schedule_work(&console_work); 3936 } 3937 3938 void poke_blanked_console(void) 3939 { 3940 WARN_CONSOLE_UNLOCKED(); 3941 3942 /* Add this so we quickly catch whoever might call us in a non 3943 * safe context. Nowadays, unblank_screen() isn't to be called in 3944 * atomic contexts and is allowed to schedule (with the special case 3945 * of oops_in_progress, but that isn't of any concern for this 3946 * function. --BenH. 3947 */ 3948 might_sleep(); 3949 3950 /* This isn't perfectly race free, but a race here would be mostly harmless, 3951 * at worse, we'll do a spurrious blank and it's unlikely 3952 */ 3953 del_timer(&console_timer); 3954 blank_timer_expired = 0; 3955 3956 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS) 3957 return; 3958 if (console_blanked) 3959 unblank_screen(); 3960 else if (blankinterval) { 3961 mod_timer(&console_timer, jiffies + (blankinterval * HZ)); 3962 blank_state = blank_normal_wait; 3963 } 3964 } 3965 3966 /* 3967 * Palettes 3968 */ 3969 3970 static void set_palette(struct vc_data *vc) 3971 { 3972 WARN_CONSOLE_UNLOCKED(); 3973 3974 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette) 3975 vc->vc_sw->con_set_palette(vc, color_table); 3976 } 3977 3978 /* 3979 * Load palette into the DAC registers. arg points to a colour 3980 * map, 3 bytes per colour, 16 colours, range from 0 to 255. 3981 */ 3982 3983 int con_set_cmap(unsigned char __user *arg) 3984 { 3985 int i, j, k; 3986 unsigned char colormap[3*16]; 3987 3988 if (copy_from_user(colormap, arg, sizeof(colormap))) 3989 return -EFAULT; 3990 3991 console_lock(); 3992 for (i = k = 0; i < 16; i++) { 3993 default_red[i] = colormap[k++]; 3994 default_grn[i] = colormap[k++]; 3995 default_blu[i] = colormap[k++]; 3996 } 3997 for (i = 0; i < MAX_NR_CONSOLES; i++) { 3998 if (!vc_cons_allocated(i)) 3999 continue; 4000 for (j = k = 0; j < 16; j++) { 4001 vc_cons[i].d->vc_palette[k++] = default_red[j]; 4002 vc_cons[i].d->vc_palette[k++] = default_grn[j]; 4003 vc_cons[i].d->vc_palette[k++] = default_blu[j]; 4004 } 4005 set_palette(vc_cons[i].d); 4006 } 4007 console_unlock(); 4008 4009 return 0; 4010 } 4011 4012 int con_get_cmap(unsigned char __user *arg) 4013 { 4014 int i, k; 4015 unsigned char colormap[3*16]; 4016 4017 console_lock(); 4018 for (i = k = 0; i < 16; i++) { 4019 colormap[k++] = default_red[i]; 4020 colormap[k++] = default_grn[i]; 4021 colormap[k++] = default_blu[i]; 4022 } 4023 console_unlock(); 4024 4025 if (copy_to_user(arg, colormap, sizeof(colormap))) 4026 return -EFAULT; 4027 4028 return 0; 4029 } 4030 4031 void reset_palette(struct vc_data *vc) 4032 { 4033 int j, k; 4034 for (j=k=0; j<16; j++) { 4035 vc->vc_palette[k++] = default_red[j]; 4036 vc->vc_palette[k++] = default_grn[j]; 4037 vc->vc_palette[k++] = default_blu[j]; 4038 } 4039 set_palette(vc); 4040 } 4041 4042 /* 4043 * Font switching 4044 * 4045 * Currently we only support fonts up to 32 pixels wide, at a maximum height 4046 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints, 4047 * depending on width) reserved for each character which is kinda wasty, but 4048 * this is done in order to maintain compatibility with the EGA/VGA fonts. It 4049 * is up to the actual low-level console-driver convert data into its favorite 4050 * format (maybe we should add a `fontoffset' field to the `display' 4051 * structure so we won't have to convert the fontdata all the time. 4052 * /Jes 4053 */ 4054 4055 #define max_font_size 65536 4056 4057 static int con_font_get(struct vc_data *vc, struct console_font_op *op) 4058 { 4059 struct console_font font; 4060 int rc = -EINVAL; 4061 int c; 4062 4063 if (op->data) { 4064 font.data = kmalloc(max_font_size, GFP_KERNEL); 4065 if (!font.data) 4066 return -ENOMEM; 4067 } else 4068 font.data = NULL; 4069 4070 console_lock(); 4071 if (vc->vc_mode != KD_TEXT) 4072 rc = -EINVAL; 4073 else if (vc->vc_sw->con_font_get) 4074 rc = vc->vc_sw->con_font_get(vc, &font); 4075 else 4076 rc = -ENOSYS; 4077 console_unlock(); 4078 4079 if (rc) 4080 goto out; 4081 4082 c = (font.width+7)/8 * 32 * font.charcount; 4083 4084 if (op->data && font.charcount > op->charcount) 4085 rc = -ENOSPC; 4086 if (!(op->flags & KD_FONT_FLAG_OLD)) { 4087 if (font.width > op->width || font.height > op->height) 4088 rc = -ENOSPC; 4089 } else { 4090 if (font.width != 8) 4091 rc = -EIO; 4092 else if ((op->height && font.height > op->height) || 4093 font.height > 32) 4094 rc = -ENOSPC; 4095 } 4096 if (rc) 4097 goto out; 4098 4099 op->height = font.height; 4100 op->width = font.width; 4101 op->charcount = font.charcount; 4102 4103 if (op->data && copy_to_user(op->data, font.data, c)) 4104 rc = -EFAULT; 4105 4106 out: 4107 kfree(font.data); 4108 return rc; 4109 } 4110 4111 static int con_font_set(struct vc_data *vc, struct console_font_op *op) 4112 { 4113 struct console_font font; 4114 int rc = -EINVAL; 4115 int size; 4116 4117 if (vc->vc_mode != KD_TEXT) 4118 return -EINVAL; 4119 if (!op->data) 4120 return -EINVAL; 4121 if (op->charcount > 512) 4122 return -EINVAL; 4123 if (op->width <= 0 || op->width > 32 || op->height > 32) 4124 return -EINVAL; 4125 size = (op->width+7)/8 * 32 * op->charcount; 4126 if (size > max_font_size) 4127 return -ENOSPC; 4128 4129 font.data = memdup_user(op->data, size); 4130 if (IS_ERR(font.data)) 4131 return PTR_ERR(font.data); 4132 4133 if (!op->height) { /* Need to guess font height [compat] */ 4134 int h, i; 4135 u8 *charmap = font.data; 4136 4137 /* 4138 * If from KDFONTOP ioctl, don't allow things which can be done 4139 * in userland,so that we can get rid of this soon 4140 */ 4141 if (!(op->flags & KD_FONT_FLAG_OLD)) { 4142 kfree(font.data); 4143 return -EINVAL; 4144 } 4145 4146 for (h = 32; h > 0; h--) 4147 for (i = 0; i < op->charcount; i++) 4148 if (charmap[32*i+h-1]) 4149 goto nonzero; 4150 4151 kfree(font.data); 4152 return -EINVAL; 4153 4154 nonzero: 4155 op->height = h; 4156 } 4157 4158 font.charcount = op->charcount; 4159 font.width = op->width; 4160 font.height = op->height; 4161 4162 console_lock(); 4163 if (vc->vc_mode != KD_TEXT) 4164 rc = -EINVAL; 4165 else if (vc->vc_sw->con_font_set) 4166 rc = vc->vc_sw->con_font_set(vc, &font, op->flags); 4167 else 4168 rc = -ENOSYS; 4169 console_unlock(); 4170 kfree(font.data); 4171 return rc; 4172 } 4173 4174 static int con_font_default(struct vc_data *vc, struct console_font_op *op) 4175 { 4176 struct console_font font = {.width = op->width, .height = op->height}; 4177 char name[MAX_FONT_NAME]; 4178 char *s = name; 4179 int rc; 4180 4181 4182 if (!op->data) 4183 s = NULL; 4184 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0) 4185 return -EFAULT; 4186 else 4187 name[MAX_FONT_NAME - 1] = 0; 4188 4189 console_lock(); 4190 if (vc->vc_mode != KD_TEXT) { 4191 console_unlock(); 4192 return -EINVAL; 4193 } 4194 if (vc->vc_sw->con_font_default) 4195 rc = vc->vc_sw->con_font_default(vc, &font, s); 4196 else 4197 rc = -ENOSYS; 4198 console_unlock(); 4199 if (!rc) { 4200 op->width = font.width; 4201 op->height = font.height; 4202 } 4203 return rc; 4204 } 4205 4206 static int con_font_copy(struct vc_data *vc, struct console_font_op *op) 4207 { 4208 int con = op->height; 4209 int rc; 4210 4211 4212 console_lock(); 4213 if (vc->vc_mode != KD_TEXT) 4214 rc = -EINVAL; 4215 else if (!vc->vc_sw->con_font_copy) 4216 rc = -ENOSYS; 4217 else if (con < 0 || !vc_cons_allocated(con)) 4218 rc = -ENOTTY; 4219 else if (con == vc->vc_num) /* nothing to do */ 4220 rc = 0; 4221 else 4222 rc = vc->vc_sw->con_font_copy(vc, con); 4223 console_unlock(); 4224 return rc; 4225 } 4226 4227 int con_font_op(struct vc_data *vc, struct console_font_op *op) 4228 { 4229 switch (op->op) { 4230 case KD_FONT_OP_SET: 4231 return con_font_set(vc, op); 4232 case KD_FONT_OP_GET: 4233 return con_font_get(vc, op); 4234 case KD_FONT_OP_SET_DEFAULT: 4235 return con_font_default(vc, op); 4236 case KD_FONT_OP_COPY: 4237 return con_font_copy(vc, op); 4238 } 4239 return -ENOSYS; 4240 } 4241 4242 /* 4243 * Interface exported to selection and vcs. 4244 */ 4245 4246 /* used by selection */ 4247 u16 screen_glyph(struct vc_data *vc, int offset) 4248 { 4249 u16 w = scr_readw(screenpos(vc, offset, 1)); 4250 u16 c = w & 0xff; 4251 4252 if (w & vc->vc_hi_font_mask) 4253 c |= 0x100; 4254 return c; 4255 } 4256 EXPORT_SYMBOL_GPL(screen_glyph); 4257 4258 /* used by vcs - note the word offset */ 4259 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed) 4260 { 4261 return screenpos(vc, 2 * w_offset, viewed); 4262 } 4263 EXPORT_SYMBOL_GPL(screen_pos); 4264 4265 void getconsxy(struct vc_data *vc, unsigned char *p) 4266 { 4267 p[0] = vc->vc_x; 4268 p[1] = vc->vc_y; 4269 } 4270 4271 void putconsxy(struct vc_data *vc, unsigned char *p) 4272 { 4273 hide_cursor(vc); 4274 gotoxy(vc, p[0], p[1]); 4275 set_cursor(vc); 4276 } 4277 4278 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org) 4279 { 4280 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1) 4281 return softcursor_original; 4282 return scr_readw(org); 4283 } 4284 4285 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org) 4286 { 4287 scr_writew(val, org); 4288 if ((unsigned long)org == vc->vc_pos) { 4289 softcursor_original = -1; 4290 add_softcursor(vc); 4291 } 4292 } 4293 4294 void vcs_scr_updated(struct vc_data *vc) 4295 { 4296 notify_update(vc); 4297 } 4298 4299 void vc_scrolldelta_helper(struct vc_data *c, int lines, 4300 unsigned int rolled_over, void *base, unsigned int size) 4301 { 4302 unsigned long ubase = (unsigned long)base; 4303 ptrdiff_t scr_end = (void *)c->vc_scr_end - base; 4304 ptrdiff_t vorigin = (void *)c->vc_visible_origin - base; 4305 ptrdiff_t origin = (void *)c->vc_origin - base; 4306 int margin = c->vc_size_row * 4; 4307 int from, wrap, from_off, avail; 4308 4309 /* Turn scrollback off */ 4310 if (!lines) { 4311 c->vc_visible_origin = c->vc_origin; 4312 return; 4313 } 4314 4315 /* Do we have already enough to allow jumping from 0 to the end? */ 4316 if (rolled_over > scr_end + margin) { 4317 from = scr_end; 4318 wrap = rolled_over + c->vc_size_row; 4319 } else { 4320 from = 0; 4321 wrap = size; 4322 } 4323 4324 from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row; 4325 avail = (origin - from + wrap) % wrap; 4326 4327 /* Only a little piece would be left? Show all incl. the piece! */ 4328 if (avail < 2 * margin) 4329 margin = 0; 4330 if (from_off < margin) 4331 from_off = 0; 4332 if (from_off > avail - margin) 4333 from_off = avail; 4334 4335 c->vc_visible_origin = ubase + (from + from_off) % wrap; 4336 } 4337 EXPORT_SYMBOL_GPL(vc_scrolldelta_helper); 4338 4339 /* 4340 * Visible symbols for modules 4341 */ 4342 4343 EXPORT_SYMBOL(color_table); 4344 EXPORT_SYMBOL(default_red); 4345 EXPORT_SYMBOL(default_grn); 4346 EXPORT_SYMBOL(default_blu); 4347 EXPORT_SYMBOL(update_region); 4348 EXPORT_SYMBOL(redraw_screen); 4349 EXPORT_SYMBOL(vc_resize); 4350 EXPORT_SYMBOL(fg_console); 4351 EXPORT_SYMBOL(console_blank_hook); 4352 EXPORT_SYMBOL(console_blanked); 4353 EXPORT_SYMBOL(vc_cons); 4354 EXPORT_SYMBOL(global_cursor_default); 4355 #ifndef VT_SINGLE_DRIVER 4356 EXPORT_SYMBOL(give_up_console); 4357 #endif 4358