1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 1991, 1992 Linus Torvalds 4 */ 5 6 /* 7 * Hopefully this will be a rather complete VT102 implementation. 8 * 9 * Beeping thanks to John T Kohl. 10 * 11 * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics 12 * Chars, and VT100 enhancements by Peter MacDonald. 13 * 14 * Copy and paste function by Andrew Haylett, 15 * some enhancements by Alessandro Rubini. 16 * 17 * Code to check for different video-cards mostly by Galen Hunt, 18 * <g-hunt@ee.utah.edu> 19 * 20 * Rudimentary ISO 10646/Unicode/UTF-8 character set support by 21 * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>. 22 * 23 * Dynamic allocation of consoles, aeb@cwi.nl, May 1994 24 * Resizing of consoles, aeb, 940926 25 * 26 * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94 27 * <poe@daimi.aau.dk> 28 * 29 * User-defined bell sound, new setterm control sequences and printk 30 * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95 31 * 32 * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp> 33 * 34 * Merge with the abstract console driver by Geert Uytterhoeven 35 * <geert@linux-m68k.org>, Jan 1997. 36 * 37 * Original m68k console driver modifications by 38 * 39 * - Arno Griffioen <arno@usn.nl> 40 * - David Carter <carter@cs.bris.ac.uk> 41 * 42 * The abstract console driver provides a generic interface for a text 43 * console. It supports VGA text mode, frame buffer based graphical consoles 44 * and special graphics processors that are only accessible through some 45 * registers (e.g. a TMS340x0 GSP). 46 * 47 * The interface to the hardware is specified using a special structure 48 * (struct consw) which contains function pointers to console operations 49 * (see <linux/console.h> for more information). 50 * 51 * Support for changeable cursor shape 52 * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997 53 * 54 * Ported to i386 and con_scrolldelta fixed 55 * by Emmanuel Marty <core@ggi-project.org>, April 1998 56 * 57 * Resurrected character buffers in videoram plus lots of other trickery 58 * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998 59 * 60 * Removed old-style timers, introduced console_timer, made timer 61 * deletion SMP-safe. 17Jun00, Andrew Morton 62 * 63 * Removed console_lock, enabled interrupts across all console operations 64 * 13 March 2001, Andrew Morton 65 * 66 * Fixed UTF-8 mode so alternate charset modes always work according 67 * to control sequences interpreted in do_con_trol function 68 * preserving backward VT100 semigraphics compatibility, 69 * malformed UTF sequences represented as sequences of replacement glyphs, 70 * original codes or '?' as a last resort if replacement glyph is undefined 71 * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006 72 */ 73 74 #include <linux/module.h> 75 #include <linux/types.h> 76 #include <linux/sched/signal.h> 77 #include <linux/tty.h> 78 #include <linux/tty_flip.h> 79 #include <linux/kernel.h> 80 #include <linux/string.h> 81 #include <linux/errno.h> 82 #include <linux/kd.h> 83 #include <linux/slab.h> 84 #include <linux/vmalloc.h> 85 #include <linux/major.h> 86 #include <linux/mm.h> 87 #include <linux/console.h> 88 #include <linux/init.h> 89 #include <linux/mutex.h> 90 #include <linux/vt_kern.h> 91 #include <linux/selection.h> 92 #include <linux/tiocl.h> 93 #include <linux/kbd_kern.h> 94 #include <linux/consolemap.h> 95 #include <linux/timer.h> 96 #include <linux/interrupt.h> 97 #include <linux/workqueue.h> 98 #include <linux/pm.h> 99 #include <linux/font.h> 100 #include <linux/bitops.h> 101 #include <linux/notifier.h> 102 #include <linux/device.h> 103 #include <linux/io.h> 104 #include <linux/uaccess.h> 105 #include <linux/kdb.h> 106 #include <linux/ctype.h> 107 #include <linux/bsearch.h> 108 #include <linux/gcd.h> 109 110 #define MAX_NR_CON_DRIVER 16 111 112 #define CON_DRIVER_FLAG_MODULE 1 113 #define CON_DRIVER_FLAG_INIT 2 114 #define CON_DRIVER_FLAG_ATTR 4 115 #define CON_DRIVER_FLAG_ZOMBIE 8 116 117 struct con_driver { 118 const struct consw *con; 119 const char *desc; 120 struct device *dev; 121 int node; 122 int first; 123 int last; 124 int flag; 125 }; 126 127 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER]; 128 const struct consw *conswitchp; 129 130 /* 131 * Here is the default bell parameters: 750HZ, 1/8th of a second 132 */ 133 #define DEFAULT_BELL_PITCH 750 134 #define DEFAULT_BELL_DURATION (HZ/8) 135 #define DEFAULT_CURSOR_BLINK_MS 200 136 137 struct vc vc_cons [MAX_NR_CONSOLES]; 138 139 #ifndef VT_SINGLE_DRIVER 140 static const struct consw *con_driver_map[MAX_NR_CONSOLES]; 141 #endif 142 143 static int con_open(struct tty_struct *, struct file *); 144 static void vc_init(struct vc_data *vc, unsigned int rows, 145 unsigned int cols, int do_clear); 146 static void gotoxy(struct vc_data *vc, int new_x, int new_y); 147 static void save_cur(struct vc_data *vc); 148 static void reset_terminal(struct vc_data *vc, int do_clear); 149 static void con_flush_chars(struct tty_struct *tty); 150 static int set_vesa_blanking(char __user *p); 151 static void set_cursor(struct vc_data *vc); 152 static void hide_cursor(struct vc_data *vc); 153 static void console_callback(struct work_struct *ignored); 154 static void con_driver_unregister_callback(struct work_struct *ignored); 155 static void blank_screen_t(struct timer_list *unused); 156 static void set_palette(struct vc_data *vc); 157 158 #define vt_get_kmsg_redirect() vt_kmsg_redirect(-1) 159 160 static int printable; /* Is console ready for printing? */ 161 int default_utf8 = true; 162 module_param(default_utf8, int, S_IRUGO | S_IWUSR); 163 int global_cursor_default = -1; 164 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR); 165 166 static int cur_default = CUR_UNDERLINE; 167 module_param(cur_default, int, S_IRUGO | S_IWUSR); 168 169 /* 170 * ignore_poke: don't unblank the screen when things are typed. This is 171 * mainly for the privacy of braille terminal users. 172 */ 173 static int ignore_poke; 174 175 int do_poke_blanked_console; 176 int console_blanked; 177 178 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */ 179 static int vesa_off_interval; 180 static int blankinterval; 181 core_param(consoleblank, blankinterval, int, 0444); 182 183 static DECLARE_WORK(console_work, console_callback); 184 static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback); 185 186 /* 187 * fg_console is the current virtual console, 188 * last_console is the last used one, 189 * want_console is the console we want to switch to, 190 * saved_* variants are for save/restore around kernel debugger enter/leave 191 */ 192 int fg_console; 193 int last_console; 194 int want_console = -1; 195 static int saved_fg_console; 196 static int saved_last_console; 197 static int saved_want_console; 198 static int saved_vc_mode; 199 static int saved_console_blanked; 200 201 /* 202 * For each existing display, we have a pointer to console currently visible 203 * on that display, allowing consoles other than fg_console to be refreshed 204 * appropriately. Unless the low-level driver supplies its own display_fg 205 * variable, we use this one for the "master display". 206 */ 207 static struct vc_data *master_display_fg; 208 209 /* 210 * Unfortunately, we need to delay tty echo when we're currently writing to the 211 * console since the code is (and always was) not re-entrant, so we schedule 212 * all flip requests to process context with schedule-task() and run it from 213 * console_callback(). 214 */ 215 216 /* 217 * For the same reason, we defer scrollback to the console callback. 218 */ 219 static int scrollback_delta; 220 221 /* 222 * Hook so that the power management routines can (un)blank 223 * the console on our behalf. 224 */ 225 int (*console_blank_hook)(int); 226 227 static DEFINE_TIMER(console_timer, blank_screen_t); 228 static int blank_state; 229 static int blank_timer_expired; 230 enum { 231 blank_off = 0, 232 blank_normal_wait, 233 blank_vesa_wait, 234 }; 235 236 /* 237 * /sys/class/tty/tty0/ 238 * 239 * the attribute 'active' contains the name of the current vc 240 * console and it supports poll() to detect vc switches 241 */ 242 static struct device *tty0dev; 243 244 /* 245 * Notifier list for console events. 246 */ 247 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list); 248 249 int register_vt_notifier(struct notifier_block *nb) 250 { 251 return atomic_notifier_chain_register(&vt_notifier_list, nb); 252 } 253 EXPORT_SYMBOL_GPL(register_vt_notifier); 254 255 int unregister_vt_notifier(struct notifier_block *nb) 256 { 257 return atomic_notifier_chain_unregister(&vt_notifier_list, nb); 258 } 259 EXPORT_SYMBOL_GPL(unregister_vt_notifier); 260 261 static void notify_write(struct vc_data *vc, unsigned int unicode) 262 { 263 struct vt_notifier_param param = { .vc = vc, .c = unicode }; 264 atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, ¶m); 265 } 266 267 static void notify_update(struct vc_data *vc) 268 { 269 struct vt_notifier_param param = { .vc = vc }; 270 atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, ¶m); 271 } 272 /* 273 * Low-Level Functions 274 */ 275 276 static inline bool con_is_fg(const struct vc_data *vc) 277 { 278 return vc->vc_num == fg_console; 279 } 280 281 static inline bool con_should_update(const struct vc_data *vc) 282 { 283 return con_is_visible(vc) && !console_blanked; 284 } 285 286 static inline unsigned short *screenpos(const struct vc_data *vc, int offset, 287 bool viewed) 288 { 289 unsigned short *p; 290 291 if (!viewed) 292 p = (unsigned short *)(vc->vc_origin + offset); 293 else if (!vc->vc_sw->con_screen_pos) 294 p = (unsigned short *)(vc->vc_visible_origin + offset); 295 else 296 p = vc->vc_sw->con_screen_pos(vc, offset); 297 return p; 298 } 299 300 /* Called from the keyboard irq path.. */ 301 static inline void scrolldelta(int lines) 302 { 303 /* FIXME */ 304 /* scrolldelta needs some kind of consistency lock, but the BKL was 305 and still is not protecting versus the scheduled back end */ 306 scrollback_delta += lines; 307 schedule_console_callback(); 308 } 309 310 void schedule_console_callback(void) 311 { 312 schedule_work(&console_work); 313 } 314 315 /* 316 * Code to manage unicode-based screen buffers 317 */ 318 319 #ifdef NO_VC_UNI_SCREEN 320 /* this disables and optimizes related code away at compile time */ 321 #define get_vc_uniscr(vc) NULL 322 #else 323 #define get_vc_uniscr(vc) vc->vc_uni_screen 324 #endif 325 326 #define VC_UNI_SCREEN_DEBUG 0 327 328 typedef uint32_t char32_t; 329 330 /* 331 * Our screen buffer is preceded by an array of line pointers so that 332 * scrolling only implies some pointer shuffling. 333 */ 334 struct uni_screen { 335 char32_t *lines[0]; 336 }; 337 338 static struct uni_screen *vc_uniscr_alloc(unsigned int cols, unsigned int rows) 339 { 340 struct uni_screen *uniscr; 341 void *p; 342 unsigned int memsize, i; 343 344 /* allocate everything in one go */ 345 memsize = cols * rows * sizeof(char32_t); 346 memsize += rows * sizeof(char32_t *); 347 p = vmalloc(memsize); 348 if (!p) 349 return NULL; 350 351 /* initial line pointers */ 352 uniscr = p; 353 p = uniscr->lines + rows; 354 for (i = 0; i < rows; i++) { 355 uniscr->lines[i] = p; 356 p += cols * sizeof(char32_t); 357 } 358 return uniscr; 359 } 360 361 static void vc_uniscr_free(struct uni_screen *uniscr) 362 { 363 vfree(uniscr); 364 } 365 366 static void vc_uniscr_set(struct vc_data *vc, struct uni_screen *new_uniscr) 367 { 368 vc_uniscr_free(vc->vc_uni_screen); 369 vc->vc_uni_screen = new_uniscr; 370 } 371 372 static void vc_uniscr_putc(struct vc_data *vc, char32_t uc) 373 { 374 struct uni_screen *uniscr = get_vc_uniscr(vc); 375 376 if (uniscr) 377 uniscr->lines[vc->state.y][vc->state.x] = uc; 378 } 379 380 static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr) 381 { 382 struct uni_screen *uniscr = get_vc_uniscr(vc); 383 384 if (uniscr) { 385 char32_t *ln = uniscr->lines[vc->state.y]; 386 unsigned int x = vc->state.x, cols = vc->vc_cols; 387 388 memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln)); 389 memset32(&ln[x], ' ', nr); 390 } 391 } 392 393 static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr) 394 { 395 struct uni_screen *uniscr = get_vc_uniscr(vc); 396 397 if (uniscr) { 398 char32_t *ln = uniscr->lines[vc->state.y]; 399 unsigned int x = vc->state.x, cols = vc->vc_cols; 400 401 memcpy(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln)); 402 memset32(&ln[cols - nr], ' ', nr); 403 } 404 } 405 406 static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x, 407 unsigned int nr) 408 { 409 struct uni_screen *uniscr = get_vc_uniscr(vc); 410 411 if (uniscr) { 412 char32_t *ln = uniscr->lines[vc->state.y]; 413 414 memset32(&ln[x], ' ', nr); 415 } 416 } 417 418 static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y, 419 unsigned int nr) 420 { 421 struct uni_screen *uniscr = get_vc_uniscr(vc); 422 423 if (uniscr) { 424 unsigned int cols = vc->vc_cols; 425 426 while (nr--) 427 memset32(uniscr->lines[y++], ' ', cols); 428 } 429 } 430 431 static void vc_uniscr_scroll(struct vc_data *vc, unsigned int t, unsigned int b, 432 enum con_scroll dir, unsigned int nr) 433 { 434 struct uni_screen *uniscr = get_vc_uniscr(vc); 435 436 if (uniscr) { 437 unsigned int i, j, k, sz, d, clear; 438 439 sz = b - t; 440 clear = b - nr; 441 d = nr; 442 if (dir == SM_DOWN) { 443 clear = t; 444 d = sz - nr; 445 } 446 for (i = 0; i < gcd(d, sz); i++) { 447 char32_t *tmp = uniscr->lines[t + i]; 448 j = i; 449 while (1) { 450 k = j + d; 451 if (k >= sz) 452 k -= sz; 453 if (k == i) 454 break; 455 uniscr->lines[t + j] = uniscr->lines[t + k]; 456 j = k; 457 } 458 uniscr->lines[t + j] = tmp; 459 } 460 vc_uniscr_clear_lines(vc, clear, nr); 461 } 462 } 463 464 static void vc_uniscr_copy_area(struct uni_screen *dst, 465 unsigned int dst_cols, 466 unsigned int dst_rows, 467 struct uni_screen *src, 468 unsigned int src_cols, 469 unsigned int src_top_row, 470 unsigned int src_bot_row) 471 { 472 unsigned int dst_row = 0; 473 474 if (!dst) 475 return; 476 477 while (src_top_row < src_bot_row) { 478 char32_t *src_line = src->lines[src_top_row]; 479 char32_t *dst_line = dst->lines[dst_row]; 480 481 memcpy(dst_line, src_line, src_cols * sizeof(char32_t)); 482 if (dst_cols - src_cols) 483 memset32(dst_line + src_cols, ' ', dst_cols - src_cols); 484 src_top_row++; 485 dst_row++; 486 } 487 while (dst_row < dst_rows) { 488 char32_t *dst_line = dst->lines[dst_row]; 489 490 memset32(dst_line, ' ', dst_cols); 491 dst_row++; 492 } 493 } 494 495 /* 496 * Called from vcs_read() to make sure unicode screen retrieval is possible. 497 * This will initialize the unicode screen buffer if not already done. 498 * This returns 0 if OK, or a negative error code otherwise. 499 * In particular, -ENODATA is returned if the console is not in UTF-8 mode. 500 */ 501 int vc_uniscr_check(struct vc_data *vc) 502 { 503 struct uni_screen *uniscr; 504 unsigned short *p; 505 int x, y, mask; 506 507 if (__is_defined(NO_VC_UNI_SCREEN)) 508 return -EOPNOTSUPP; 509 510 WARN_CONSOLE_UNLOCKED(); 511 512 if (!vc->vc_utf) 513 return -ENODATA; 514 515 if (vc->vc_uni_screen) 516 return 0; 517 518 uniscr = vc_uniscr_alloc(vc->vc_cols, vc->vc_rows); 519 if (!uniscr) 520 return -ENOMEM; 521 522 /* 523 * Let's populate it initially with (imperfect) reverse translation. 524 * This is the next best thing we can do short of having it enabled 525 * from the start even when no users rely on this functionality. True 526 * unicode content will be available after a complete screen refresh. 527 */ 528 p = (unsigned short *)vc->vc_origin; 529 mask = vc->vc_hi_font_mask | 0xff; 530 for (y = 0; y < vc->vc_rows; y++) { 531 char32_t *line = uniscr->lines[y]; 532 for (x = 0; x < vc->vc_cols; x++) { 533 u16 glyph = scr_readw(p++) & mask; 534 line[x] = inverse_translate(vc, glyph, true); 535 } 536 } 537 538 vc->vc_uni_screen = uniscr; 539 return 0; 540 } 541 542 /* 543 * Called from vcs_read() to get the unicode data from the screen. 544 * This must be preceded by a successful call to vc_uniscr_check() once 545 * the console lock has been taken. 546 */ 547 void vc_uniscr_copy_line(const struct vc_data *vc, void *dest, bool viewed, 548 unsigned int row, unsigned int col, unsigned int nr) 549 { 550 struct uni_screen *uniscr = get_vc_uniscr(vc); 551 int offset = row * vc->vc_size_row + col * 2; 552 unsigned long pos; 553 554 BUG_ON(!uniscr); 555 556 pos = (unsigned long)screenpos(vc, offset, viewed); 557 if (pos >= vc->vc_origin && pos < vc->vc_scr_end) { 558 /* 559 * Desired position falls in the main screen buffer. 560 * However the actual row/col might be different if 561 * scrollback is active. 562 */ 563 row = (pos - vc->vc_origin) / vc->vc_size_row; 564 col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2; 565 memcpy(dest, &uniscr->lines[row][col], nr * sizeof(char32_t)); 566 } else { 567 /* 568 * Scrollback is active. For now let's simply backtranslate 569 * the screen glyphs until the unicode screen buffer does 570 * synchronize with console display drivers for a scrollback 571 * buffer of its own. 572 */ 573 u16 *p = (u16 *)pos; 574 int mask = vc->vc_hi_font_mask | 0xff; 575 char32_t *uni_buf = dest; 576 while (nr--) { 577 u16 glyph = scr_readw(p++) & mask; 578 *uni_buf++ = inverse_translate(vc, glyph, true); 579 } 580 } 581 } 582 583 /* this is for validation and debugging only */ 584 static void vc_uniscr_debug_check(struct vc_data *vc) 585 { 586 struct uni_screen *uniscr = get_vc_uniscr(vc); 587 unsigned short *p; 588 int x, y, mask; 589 590 if (!VC_UNI_SCREEN_DEBUG || !uniscr) 591 return; 592 593 WARN_CONSOLE_UNLOCKED(); 594 595 /* 596 * Make sure our unicode screen translates into the same glyphs 597 * as the actual screen. This is brutal indeed. 598 */ 599 p = (unsigned short *)vc->vc_origin; 600 mask = vc->vc_hi_font_mask | 0xff; 601 for (y = 0; y < vc->vc_rows; y++) { 602 char32_t *line = uniscr->lines[y]; 603 for (x = 0; x < vc->vc_cols; x++) { 604 u16 glyph = scr_readw(p++) & mask; 605 char32_t uc = line[x]; 606 int tc = conv_uni_to_pc(vc, uc); 607 if (tc == -4) 608 tc = conv_uni_to_pc(vc, 0xfffd); 609 if (tc == -4) 610 tc = conv_uni_to_pc(vc, '?'); 611 if (tc != glyph) 612 pr_err_ratelimited( 613 "%s: mismatch at %d,%d: glyph=%#x tc=%#x\n", 614 __func__, x, y, glyph, tc); 615 } 616 } 617 } 618 619 620 static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b, 621 enum con_scroll dir, unsigned int nr) 622 { 623 u16 *clear, *d, *s; 624 625 if (t + nr >= b) 626 nr = b - t - 1; 627 if (b > vc->vc_rows || t >= b || nr < 1) 628 return; 629 vc_uniscr_scroll(vc, t, b, dir, nr); 630 if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr)) 631 return; 632 633 s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t); 634 d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr)); 635 636 if (dir == SM_UP) { 637 clear = s + (b - t - nr) * vc->vc_cols; 638 swap(s, d); 639 } 640 scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row); 641 scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr); 642 } 643 644 static void do_update_region(struct vc_data *vc, unsigned long start, int count) 645 { 646 unsigned int xx, yy, offset; 647 u16 *p; 648 649 p = (u16 *) start; 650 if (!vc->vc_sw->con_getxy) { 651 offset = (start - vc->vc_origin) / 2; 652 xx = offset % vc->vc_cols; 653 yy = offset / vc->vc_cols; 654 } else { 655 int nxx, nyy; 656 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy); 657 xx = nxx; yy = nyy; 658 } 659 for(;;) { 660 u16 attrib = scr_readw(p) & 0xff00; 661 int startx = xx; 662 u16 *q = p; 663 while (xx < vc->vc_cols && count) { 664 if (attrib != (scr_readw(p) & 0xff00)) { 665 if (p > q) 666 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx); 667 startx = xx; 668 q = p; 669 attrib = scr_readw(p) & 0xff00; 670 } 671 p++; 672 xx++; 673 count--; 674 } 675 if (p > q) 676 vc->vc_sw->con_putcs(vc, q, p-q, yy, startx); 677 if (!count) 678 break; 679 xx = 0; 680 yy++; 681 if (vc->vc_sw->con_getxy) { 682 p = (u16 *)start; 683 start = vc->vc_sw->con_getxy(vc, start, NULL, NULL); 684 } 685 } 686 } 687 688 void update_region(struct vc_data *vc, unsigned long start, int count) 689 { 690 WARN_CONSOLE_UNLOCKED(); 691 692 if (con_should_update(vc)) { 693 hide_cursor(vc); 694 do_update_region(vc, start, count); 695 set_cursor(vc); 696 } 697 } 698 699 /* Structure of attributes is hardware-dependent */ 700 701 static u8 build_attr(struct vc_data *vc, u8 _color, 702 enum vc_intensity _intensity, bool _blink, bool _underline, 703 bool _reverse, bool _italic) 704 { 705 if (vc->vc_sw->con_build_attr) 706 return vc->vc_sw->con_build_attr(vc, _color, _intensity, 707 _blink, _underline, _reverse, _italic); 708 709 /* 710 * ++roman: I completely changed the attribute format for monochrome 711 * mode (!can_do_color). The formerly used MDA (monochrome display 712 * adapter) format didn't allow the combination of certain effects. 713 * Now the attribute is just a bit vector: 714 * Bit 0..1: intensity (0..2) 715 * Bit 2 : underline 716 * Bit 3 : reverse 717 * Bit 7 : blink 718 */ 719 { 720 u8 a = _color; 721 if (!vc->vc_can_do_color) 722 return _intensity | 723 (_italic << 1) | 724 (_underline << 2) | 725 (_reverse << 3) | 726 (_blink << 7); 727 if (_italic) 728 a = (a & 0xF0) | vc->vc_itcolor; 729 else if (_underline) 730 a = (a & 0xf0) | vc->vc_ulcolor; 731 else if (_intensity == VCI_HALF_BRIGHT) 732 a = (a & 0xf0) | vc->vc_halfcolor; 733 if (_reverse) 734 a = (a & 0x88) | (((a >> 4) | (a << 4)) & 0x77); 735 if (_blink) 736 a ^= 0x80; 737 if (_intensity == VCI_BOLD) 738 a ^= 0x08; 739 if (vc->vc_hi_font_mask == 0x100) 740 a <<= 1; 741 return a; 742 } 743 } 744 745 static void update_attr(struct vc_data *vc) 746 { 747 vc->vc_attr = build_attr(vc, vc->state.color, vc->state.intensity, 748 vc->state.blink, vc->state.underline, 749 vc->state.reverse ^ vc->vc_decscnm, vc->state.italic); 750 vc->vc_video_erase_char = ' ' | (build_attr(vc, vc->state.color, 751 VCI_NORMAL, vc->state.blink, false, 752 vc->vc_decscnm, false) << 8); 753 } 754 755 /* Note: inverting the screen twice should revert to the original state */ 756 void invert_screen(struct vc_data *vc, int offset, int count, bool viewed) 757 { 758 unsigned short *p; 759 760 WARN_CONSOLE_UNLOCKED(); 761 762 count /= 2; 763 p = screenpos(vc, offset, viewed); 764 if (vc->vc_sw->con_invert_region) { 765 vc->vc_sw->con_invert_region(vc, p, count); 766 } else { 767 u16 *q = p; 768 int cnt = count; 769 u16 a; 770 771 if (!vc->vc_can_do_color) { 772 while (cnt--) { 773 a = scr_readw(q); 774 a ^= 0x0800; 775 scr_writew(a, q); 776 q++; 777 } 778 } else if (vc->vc_hi_font_mask == 0x100) { 779 while (cnt--) { 780 a = scr_readw(q); 781 a = (a & 0x11ff) | 782 ((a & 0xe000) >> 4) | 783 ((a & 0x0e00) << 4); 784 scr_writew(a, q); 785 q++; 786 } 787 } else { 788 while (cnt--) { 789 a = scr_readw(q); 790 a = (a & 0x88ff) | 791 ((a & 0x7000) >> 4) | 792 ((a & 0x0700) << 4); 793 scr_writew(a, q); 794 q++; 795 } 796 } 797 } 798 799 if (con_should_update(vc)) 800 do_update_region(vc, (unsigned long) p, count); 801 notify_update(vc); 802 } 803 804 /* used by selection: complement pointer position */ 805 void complement_pos(struct vc_data *vc, int offset) 806 { 807 static int old_offset = -1; 808 static unsigned short old; 809 static unsigned short oldx, oldy; 810 811 WARN_CONSOLE_UNLOCKED(); 812 813 if (old_offset != -1 && old_offset >= 0 && 814 old_offset < vc->vc_screenbuf_size) { 815 scr_writew(old, screenpos(vc, old_offset, true)); 816 if (con_should_update(vc)) 817 vc->vc_sw->con_putc(vc, old, oldy, oldx); 818 notify_update(vc); 819 } 820 821 old_offset = offset; 822 823 if (offset != -1 && offset >= 0 && 824 offset < vc->vc_screenbuf_size) { 825 unsigned short new; 826 unsigned short *p; 827 p = screenpos(vc, offset, true); 828 old = scr_readw(p); 829 new = old ^ vc->vc_complement_mask; 830 scr_writew(new, p); 831 if (con_should_update(vc)) { 832 oldx = (offset >> 1) % vc->vc_cols; 833 oldy = (offset >> 1) / vc->vc_cols; 834 vc->vc_sw->con_putc(vc, new, oldy, oldx); 835 } 836 notify_update(vc); 837 } 838 } 839 840 static void insert_char(struct vc_data *vc, unsigned int nr) 841 { 842 unsigned short *p = (unsigned short *) vc->vc_pos; 843 844 vc_uniscr_insert(vc, nr); 845 scr_memmovew(p + nr, p, (vc->vc_cols - vc->state.x - nr) * 2); 846 scr_memsetw(p, vc->vc_video_erase_char, nr * 2); 847 vc->vc_need_wrap = 0; 848 if (con_should_update(vc)) 849 do_update_region(vc, (unsigned long) p, 850 vc->vc_cols - vc->state.x); 851 } 852 853 static void delete_char(struct vc_data *vc, unsigned int nr) 854 { 855 unsigned short *p = (unsigned short *) vc->vc_pos; 856 857 vc_uniscr_delete(vc, nr); 858 scr_memcpyw(p, p + nr, (vc->vc_cols - vc->state.x - nr) * 2); 859 scr_memsetw(p + vc->vc_cols - vc->state.x - nr, vc->vc_video_erase_char, 860 nr * 2); 861 vc->vc_need_wrap = 0; 862 if (con_should_update(vc)) 863 do_update_region(vc, (unsigned long) p, 864 vc->vc_cols - vc->state.x); 865 } 866 867 static int softcursor_original = -1; 868 869 static void add_softcursor(struct vc_data *vc) 870 { 871 int i = scr_readw((u16 *) vc->vc_pos); 872 u32 type = vc->vc_cursor_type; 873 874 if (!(type & CUR_SW)) 875 return; 876 if (softcursor_original != -1) 877 return; 878 softcursor_original = i; 879 i |= CUR_SET(type); 880 i ^= CUR_CHANGE(type); 881 if ((type & CUR_ALWAYS_BG) && 882 (softcursor_original & CUR_BG) == (i & CUR_BG)) 883 i ^= CUR_BG; 884 if ((type & CUR_INVERT_FG_BG) && (i & CUR_FG) == ((i & CUR_BG) >> 4)) 885 i ^= CUR_FG; 886 scr_writew(i, (u16 *)vc->vc_pos); 887 if (con_should_update(vc)) 888 vc->vc_sw->con_putc(vc, i, vc->state.y, vc->state.x); 889 } 890 891 static void hide_softcursor(struct vc_data *vc) 892 { 893 if (softcursor_original != -1) { 894 scr_writew(softcursor_original, (u16 *)vc->vc_pos); 895 if (con_should_update(vc)) 896 vc->vc_sw->con_putc(vc, softcursor_original, 897 vc->state.y, vc->state.x); 898 softcursor_original = -1; 899 } 900 } 901 902 static void hide_cursor(struct vc_data *vc) 903 { 904 if (vc_is_sel(vc)) 905 clear_selection(); 906 907 vc->vc_sw->con_cursor(vc, CM_ERASE); 908 hide_softcursor(vc); 909 } 910 911 static void set_cursor(struct vc_data *vc) 912 { 913 if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS) 914 return; 915 if (vc->vc_deccm) { 916 if (vc_is_sel(vc)) 917 clear_selection(); 918 add_softcursor(vc); 919 if (CUR_SIZE(vc->vc_cursor_type) != CUR_NONE) 920 vc->vc_sw->con_cursor(vc, CM_DRAW); 921 } else 922 hide_cursor(vc); 923 } 924 925 static void set_origin(struct vc_data *vc) 926 { 927 WARN_CONSOLE_UNLOCKED(); 928 929 if (!con_is_visible(vc) || 930 !vc->vc_sw->con_set_origin || 931 !vc->vc_sw->con_set_origin(vc)) 932 vc->vc_origin = (unsigned long)vc->vc_screenbuf; 933 vc->vc_visible_origin = vc->vc_origin; 934 vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size; 935 vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->state.y + 936 2 * vc->state.x; 937 } 938 939 static void save_screen(struct vc_data *vc) 940 { 941 WARN_CONSOLE_UNLOCKED(); 942 943 if (vc->vc_sw->con_save_screen) 944 vc->vc_sw->con_save_screen(vc); 945 } 946 947 static void flush_scrollback(struct vc_data *vc) 948 { 949 WARN_CONSOLE_UNLOCKED(); 950 951 set_origin(vc); 952 if (vc->vc_sw->con_flush_scrollback) { 953 vc->vc_sw->con_flush_scrollback(vc); 954 } else if (con_is_visible(vc)) { 955 /* 956 * When no con_flush_scrollback method is provided then the 957 * legacy way for flushing the scrollback buffer is to use 958 * a side effect of the con_switch method. We do it only on 959 * the foreground console as background consoles have no 960 * scrollback buffers in that case and we obviously don't 961 * want to switch to them. 962 */ 963 hide_cursor(vc); 964 vc->vc_sw->con_switch(vc); 965 set_cursor(vc); 966 } 967 } 968 969 /* 970 * Redrawing of screen 971 */ 972 973 void clear_buffer_attributes(struct vc_data *vc) 974 { 975 unsigned short *p = (unsigned short *)vc->vc_origin; 976 int count = vc->vc_screenbuf_size / 2; 977 int mask = vc->vc_hi_font_mask | 0xff; 978 979 for (; count > 0; count--, p++) { 980 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p); 981 } 982 } 983 984 void redraw_screen(struct vc_data *vc, int is_switch) 985 { 986 int redraw = 0; 987 988 WARN_CONSOLE_UNLOCKED(); 989 990 if (!vc) { 991 /* strange ... */ 992 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */ 993 return; 994 } 995 996 if (is_switch) { 997 struct vc_data *old_vc = vc_cons[fg_console].d; 998 if (old_vc == vc) 999 return; 1000 if (!con_is_visible(vc)) 1001 redraw = 1; 1002 *vc->vc_display_fg = vc; 1003 fg_console = vc->vc_num; 1004 hide_cursor(old_vc); 1005 if (!con_is_visible(old_vc)) { 1006 save_screen(old_vc); 1007 set_origin(old_vc); 1008 } 1009 if (tty0dev) 1010 sysfs_notify(&tty0dev->kobj, NULL, "active"); 1011 } else { 1012 hide_cursor(vc); 1013 redraw = 1; 1014 } 1015 1016 if (redraw) { 1017 int update; 1018 int old_was_color = vc->vc_can_do_color; 1019 1020 set_origin(vc); 1021 update = vc->vc_sw->con_switch(vc); 1022 set_palette(vc); 1023 /* 1024 * If console changed from mono<->color, the best we can do 1025 * is to clear the buffer attributes. As it currently stands, 1026 * rebuilding new attributes from the old buffer is not doable 1027 * without overly complex code. 1028 */ 1029 if (old_was_color != vc->vc_can_do_color) { 1030 update_attr(vc); 1031 clear_buffer_attributes(vc); 1032 } 1033 1034 if (update && vc->vc_mode != KD_GRAPHICS) 1035 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2); 1036 } 1037 set_cursor(vc); 1038 if (is_switch) { 1039 vt_set_leds_compute_shiftstate(); 1040 notify_update(vc); 1041 } 1042 } 1043 1044 /* 1045 * Allocation, freeing and resizing of VTs. 1046 */ 1047 1048 int vc_cons_allocated(unsigned int i) 1049 { 1050 return (i < MAX_NR_CONSOLES && vc_cons[i].d); 1051 } 1052 1053 static void visual_init(struct vc_data *vc, int num, int init) 1054 { 1055 /* ++Geert: vc->vc_sw->con_init determines console size */ 1056 if (vc->vc_sw) 1057 module_put(vc->vc_sw->owner); 1058 vc->vc_sw = conswitchp; 1059 #ifndef VT_SINGLE_DRIVER 1060 if (con_driver_map[num]) 1061 vc->vc_sw = con_driver_map[num]; 1062 #endif 1063 __module_get(vc->vc_sw->owner); 1064 vc->vc_num = num; 1065 vc->vc_display_fg = &master_display_fg; 1066 if (vc->vc_uni_pagedir_loc) 1067 con_free_unimap(vc); 1068 vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir; 1069 vc->vc_uni_pagedir = NULL; 1070 vc->vc_hi_font_mask = 0; 1071 vc->vc_complement_mask = 0; 1072 vc->vc_can_do_color = 0; 1073 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS; 1074 vc->vc_sw->con_init(vc, init); 1075 if (!vc->vc_complement_mask) 1076 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800; 1077 vc->vc_s_complement_mask = vc->vc_complement_mask; 1078 vc->vc_size_row = vc->vc_cols << 1; 1079 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row; 1080 } 1081 1082 1083 static void visual_deinit(struct vc_data *vc) 1084 { 1085 vc->vc_sw->con_deinit(vc); 1086 module_put(vc->vc_sw->owner); 1087 } 1088 1089 static void vc_port_destruct(struct tty_port *port) 1090 { 1091 struct vc_data *vc = container_of(port, struct vc_data, port); 1092 1093 kfree(vc); 1094 } 1095 1096 static const struct tty_port_operations vc_port_ops = { 1097 .destruct = vc_port_destruct, 1098 }; 1099 1100 /* 1101 * Change # of rows and columns (0 means unchanged/the size of fg_console) 1102 * [this is to be used together with some user program 1103 * like resize that changes the hardware videomode] 1104 */ 1105 #define VC_MAXCOL (32767) 1106 #define VC_MAXROW (32767) 1107 1108 int vc_allocate(unsigned int currcons) /* return 0 on success */ 1109 { 1110 struct vt_notifier_param param; 1111 struct vc_data *vc; 1112 int err; 1113 1114 WARN_CONSOLE_UNLOCKED(); 1115 1116 if (currcons >= MAX_NR_CONSOLES) 1117 return -ENXIO; 1118 1119 if (vc_cons[currcons].d) 1120 return 0; 1121 1122 /* due to the granularity of kmalloc, we waste some memory here */ 1123 /* the alloc is done in two steps, to optimize the common situation 1124 of a 25x80 console (structsize=216, screenbuf_size=4000) */ 1125 /* although the numbers above are not valid since long ago, the 1126 point is still up-to-date and the comment still has its value 1127 even if only as a historical artifact. --mj, July 1998 */ 1128 param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL); 1129 if (!vc) 1130 return -ENOMEM; 1131 1132 vc_cons[currcons].d = vc; 1133 tty_port_init(&vc->port); 1134 vc->port.ops = &vc_port_ops; 1135 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK); 1136 1137 visual_init(vc, currcons, 1); 1138 1139 if (!*vc->vc_uni_pagedir_loc) 1140 con_set_default_unimap(vc); 1141 1142 err = -EINVAL; 1143 if (vc->vc_cols > VC_MAXCOL || vc->vc_rows > VC_MAXROW || 1144 vc->vc_screenbuf_size > KMALLOC_MAX_SIZE || !vc->vc_screenbuf_size) 1145 goto err_free; 1146 err = -ENOMEM; 1147 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL); 1148 if (!vc->vc_screenbuf) 1149 goto err_free; 1150 1151 /* If no drivers have overridden us and the user didn't pass a 1152 boot option, default to displaying the cursor */ 1153 if (global_cursor_default == -1) 1154 global_cursor_default = 1; 1155 1156 vc_init(vc, vc->vc_rows, vc->vc_cols, 1); 1157 vcs_make_sysfs(currcons); 1158 atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, ¶m); 1159 1160 return 0; 1161 err_free: 1162 visual_deinit(vc); 1163 kfree(vc); 1164 vc_cons[currcons].d = NULL; 1165 return err; 1166 } 1167 1168 static inline int resize_screen(struct vc_data *vc, int width, int height, 1169 int user) 1170 { 1171 /* Resizes the resolution of the display adapater */ 1172 int err = 0; 1173 1174 if (vc->vc_sw->con_resize) 1175 err = vc->vc_sw->con_resize(vc, width, height, user); 1176 1177 return err; 1178 } 1179 1180 /** 1181 * vc_do_resize - resizing method for the tty 1182 * @tty: tty being resized 1183 * @vc: virtual console private data 1184 * @cols: columns 1185 * @lines: lines 1186 * 1187 * Resize a virtual console, clipping according to the actual constraints. 1188 * If the caller passes a tty structure then update the termios winsize 1189 * information and perform any necessary signal handling. 1190 * 1191 * Caller must hold the console semaphore. Takes the termios rwsem and 1192 * ctrl.lock of the tty IFF a tty is passed. 1193 */ 1194 1195 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc, 1196 unsigned int cols, unsigned int lines) 1197 { 1198 unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0; 1199 unsigned long end; 1200 unsigned int old_rows, old_row_size, first_copied_row; 1201 unsigned int new_cols, new_rows, new_row_size, new_screen_size; 1202 unsigned int user; 1203 unsigned short *oldscreen, *newscreen; 1204 struct uni_screen *new_uniscr = NULL; 1205 1206 WARN_CONSOLE_UNLOCKED(); 1207 1208 if (!vc) 1209 return -ENXIO; 1210 1211 user = vc->vc_resize_user; 1212 vc->vc_resize_user = 0; 1213 1214 if (cols > VC_MAXCOL || lines > VC_MAXROW) 1215 return -EINVAL; 1216 1217 new_cols = (cols ? cols : vc->vc_cols); 1218 new_rows = (lines ? lines : vc->vc_rows); 1219 new_row_size = new_cols << 1; 1220 new_screen_size = new_row_size * new_rows; 1221 1222 if (new_cols == vc->vc_cols && new_rows == vc->vc_rows) 1223 return 0; 1224 1225 if (new_screen_size > KMALLOC_MAX_SIZE || !new_screen_size) 1226 return -EINVAL; 1227 newscreen = kzalloc(new_screen_size, GFP_USER); 1228 if (!newscreen) 1229 return -ENOMEM; 1230 1231 if (get_vc_uniscr(vc)) { 1232 new_uniscr = vc_uniscr_alloc(new_cols, new_rows); 1233 if (!new_uniscr) { 1234 kfree(newscreen); 1235 return -ENOMEM; 1236 } 1237 } 1238 1239 if (vc_is_sel(vc)) 1240 clear_selection(); 1241 1242 old_rows = vc->vc_rows; 1243 old_row_size = vc->vc_size_row; 1244 1245 err = resize_screen(vc, new_cols, new_rows, user); 1246 if (err) { 1247 kfree(newscreen); 1248 vc_uniscr_free(new_uniscr); 1249 return err; 1250 } 1251 1252 vc->vc_rows = new_rows; 1253 vc->vc_cols = new_cols; 1254 vc->vc_size_row = new_row_size; 1255 vc->vc_screenbuf_size = new_screen_size; 1256 1257 rlth = min(old_row_size, new_row_size); 1258 rrem = new_row_size - rlth; 1259 old_origin = vc->vc_origin; 1260 new_origin = (long) newscreen; 1261 new_scr_end = new_origin + new_screen_size; 1262 1263 if (vc->state.y > new_rows) { 1264 if (old_rows - vc->state.y < new_rows) { 1265 /* 1266 * Cursor near the bottom, copy contents from the 1267 * bottom of buffer 1268 */ 1269 first_copied_row = (old_rows - new_rows); 1270 } else { 1271 /* 1272 * Cursor is in no man's land, copy 1/2 screenful 1273 * from the top and bottom of cursor position 1274 */ 1275 first_copied_row = (vc->state.y - new_rows/2); 1276 } 1277 old_origin += first_copied_row * old_row_size; 1278 } else 1279 first_copied_row = 0; 1280 end = old_origin + old_row_size * min(old_rows, new_rows); 1281 1282 vc_uniscr_copy_area(new_uniscr, new_cols, new_rows, 1283 get_vc_uniscr(vc), rlth/2, first_copied_row, 1284 min(old_rows, new_rows)); 1285 vc_uniscr_set(vc, new_uniscr); 1286 1287 update_attr(vc); 1288 1289 while (old_origin < end) { 1290 scr_memcpyw((unsigned short *) new_origin, 1291 (unsigned short *) old_origin, rlth); 1292 if (rrem) 1293 scr_memsetw((void *)(new_origin + rlth), 1294 vc->vc_video_erase_char, rrem); 1295 old_origin += old_row_size; 1296 new_origin += new_row_size; 1297 } 1298 if (new_scr_end > new_origin) 1299 scr_memsetw((void *)new_origin, vc->vc_video_erase_char, 1300 new_scr_end - new_origin); 1301 oldscreen = vc->vc_screenbuf; 1302 vc->vc_screenbuf = newscreen; 1303 vc->vc_screenbuf_size = new_screen_size; 1304 set_origin(vc); 1305 kfree(oldscreen); 1306 1307 /* do part of a reset_terminal() */ 1308 vc->vc_top = 0; 1309 vc->vc_bottom = vc->vc_rows; 1310 gotoxy(vc, vc->state.x, vc->state.y); 1311 save_cur(vc); 1312 1313 if (tty) { 1314 /* Rewrite the requested winsize data with the actual 1315 resulting sizes */ 1316 struct winsize ws; 1317 memset(&ws, 0, sizeof(ws)); 1318 ws.ws_row = vc->vc_rows; 1319 ws.ws_col = vc->vc_cols; 1320 ws.ws_ypixel = vc->vc_scan_lines; 1321 tty_do_resize(tty, &ws); 1322 } 1323 1324 if (con_is_visible(vc)) 1325 update_screen(vc); 1326 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num); 1327 notify_update(vc); 1328 return err; 1329 } 1330 1331 /** 1332 * vc_resize - resize a VT 1333 * @vc: virtual console 1334 * @cols: columns 1335 * @rows: rows 1336 * 1337 * Resize a virtual console as seen from the console end of things. We 1338 * use the common vc_do_resize methods to update the structures. The 1339 * caller must hold the console sem to protect console internals and 1340 * vc->port.tty 1341 */ 1342 1343 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows) 1344 { 1345 return vc_do_resize(vc->port.tty, vc, cols, rows); 1346 } 1347 1348 /** 1349 * vt_resize - resize a VT 1350 * @tty: tty to resize 1351 * @ws: winsize attributes 1352 * 1353 * Resize a virtual terminal. This is called by the tty layer as we 1354 * register our own handler for resizing. The mutual helper does all 1355 * the actual work. 1356 * 1357 * Takes the console sem and the called methods then take the tty 1358 * termios_rwsem and the tty ctrl.lock in that order. 1359 */ 1360 static int vt_resize(struct tty_struct *tty, struct winsize *ws) 1361 { 1362 struct vc_data *vc = tty->driver_data; 1363 int ret; 1364 1365 console_lock(); 1366 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row); 1367 console_unlock(); 1368 return ret; 1369 } 1370 1371 struct vc_data *vc_deallocate(unsigned int currcons) 1372 { 1373 struct vc_data *vc = NULL; 1374 1375 WARN_CONSOLE_UNLOCKED(); 1376 1377 if (vc_cons_allocated(currcons)) { 1378 struct vt_notifier_param param; 1379 1380 param.vc = vc = vc_cons[currcons].d; 1381 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, ¶m); 1382 vcs_remove_sysfs(currcons); 1383 visual_deinit(vc); 1384 con_free_unimap(vc); 1385 put_pid(vc->vt_pid); 1386 vc_uniscr_set(vc, NULL); 1387 kfree(vc->vc_screenbuf); 1388 vc_cons[currcons].d = NULL; 1389 } 1390 return vc; 1391 } 1392 1393 /* 1394 * VT102 emulator 1395 */ 1396 1397 enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt}; 1398 1399 #define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x)) 1400 #define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x)) 1401 #define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x)) 1402 1403 #define decarm VC_REPEAT 1404 #define decckm VC_CKMODE 1405 #define kbdapplic VC_APPLIC 1406 #define lnm VC_CRLF 1407 1408 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7, 1409 8,12,10,14, 9,13,11,15 }; 1410 1411 /* the default colour table, for VGA+ colour systems */ 1412 unsigned char default_red[] = { 1413 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 1414 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff 1415 }; 1416 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR); 1417 1418 unsigned char default_grn[] = { 1419 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa, 1420 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff 1421 }; 1422 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR); 1423 1424 unsigned char default_blu[] = { 1425 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa, 1426 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff 1427 }; 1428 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR); 1429 1430 /* 1431 * gotoxy() must verify all boundaries, because the arguments 1432 * might also be negative. If the given position is out of 1433 * bounds, the cursor is placed at the nearest margin. 1434 */ 1435 static void gotoxy(struct vc_data *vc, int new_x, int new_y) 1436 { 1437 int min_y, max_y; 1438 1439 if (new_x < 0) 1440 vc->state.x = 0; 1441 else { 1442 if (new_x >= vc->vc_cols) 1443 vc->state.x = vc->vc_cols - 1; 1444 else 1445 vc->state.x = new_x; 1446 } 1447 1448 if (vc->vc_decom) { 1449 min_y = vc->vc_top; 1450 max_y = vc->vc_bottom; 1451 } else { 1452 min_y = 0; 1453 max_y = vc->vc_rows; 1454 } 1455 if (new_y < min_y) 1456 vc->state.y = min_y; 1457 else if (new_y >= max_y) 1458 vc->state.y = max_y - 1; 1459 else 1460 vc->state.y = new_y; 1461 vc->vc_pos = vc->vc_origin + vc->state.y * vc->vc_size_row + 1462 (vc->state.x << 1); 1463 vc->vc_need_wrap = 0; 1464 } 1465 1466 /* for absolute user moves, when decom is set */ 1467 static void gotoxay(struct vc_data *vc, int new_x, int new_y) 1468 { 1469 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y); 1470 } 1471 1472 void scrollback(struct vc_data *vc) 1473 { 1474 scrolldelta(-(vc->vc_rows / 2)); 1475 } 1476 1477 void scrollfront(struct vc_data *vc, int lines) 1478 { 1479 if (!lines) 1480 lines = vc->vc_rows / 2; 1481 scrolldelta(lines); 1482 } 1483 1484 static void lf(struct vc_data *vc) 1485 { 1486 /* don't scroll if above bottom of scrolling region, or 1487 * if below scrolling region 1488 */ 1489 if (vc->state.y + 1 == vc->vc_bottom) 1490 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1); 1491 else if (vc->state.y < vc->vc_rows - 1) { 1492 vc->state.y++; 1493 vc->vc_pos += vc->vc_size_row; 1494 } 1495 vc->vc_need_wrap = 0; 1496 notify_write(vc, '\n'); 1497 } 1498 1499 static void ri(struct vc_data *vc) 1500 { 1501 /* don't scroll if below top of scrolling region, or 1502 * if above scrolling region 1503 */ 1504 if (vc->state.y == vc->vc_top) 1505 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1); 1506 else if (vc->state.y > 0) { 1507 vc->state.y--; 1508 vc->vc_pos -= vc->vc_size_row; 1509 } 1510 vc->vc_need_wrap = 0; 1511 } 1512 1513 static inline void cr(struct vc_data *vc) 1514 { 1515 vc->vc_pos -= vc->state.x << 1; 1516 vc->vc_need_wrap = vc->state.x = 0; 1517 notify_write(vc, '\r'); 1518 } 1519 1520 static inline void bs(struct vc_data *vc) 1521 { 1522 if (vc->state.x) { 1523 vc->vc_pos -= 2; 1524 vc->state.x--; 1525 vc->vc_need_wrap = 0; 1526 notify_write(vc, '\b'); 1527 } 1528 } 1529 1530 static inline void del(struct vc_data *vc) 1531 { 1532 /* ignored */ 1533 } 1534 1535 static void csi_J(struct vc_data *vc, int vpar) 1536 { 1537 unsigned int count; 1538 unsigned short * start; 1539 1540 switch (vpar) { 1541 case 0: /* erase from cursor to end of display */ 1542 vc_uniscr_clear_line(vc, vc->state.x, 1543 vc->vc_cols - vc->state.x); 1544 vc_uniscr_clear_lines(vc, vc->state.y + 1, 1545 vc->vc_rows - vc->state.y - 1); 1546 count = (vc->vc_scr_end - vc->vc_pos) >> 1; 1547 start = (unsigned short *)vc->vc_pos; 1548 break; 1549 case 1: /* erase from start to cursor */ 1550 vc_uniscr_clear_line(vc, 0, vc->state.x + 1); 1551 vc_uniscr_clear_lines(vc, 0, vc->state.y); 1552 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1; 1553 start = (unsigned short *)vc->vc_origin; 1554 break; 1555 case 3: /* include scrollback */ 1556 flush_scrollback(vc); 1557 fallthrough; 1558 case 2: /* erase whole display */ 1559 vc_uniscr_clear_lines(vc, 0, vc->vc_rows); 1560 count = vc->vc_cols * vc->vc_rows; 1561 start = (unsigned short *)vc->vc_origin; 1562 break; 1563 default: 1564 return; 1565 } 1566 scr_memsetw(start, vc->vc_video_erase_char, 2 * count); 1567 if (con_should_update(vc)) 1568 do_update_region(vc, (unsigned long) start, count); 1569 vc->vc_need_wrap = 0; 1570 } 1571 1572 static void csi_K(struct vc_data *vc, int vpar) 1573 { 1574 unsigned int count; 1575 unsigned short *start = (unsigned short *)vc->vc_pos; 1576 int offset; 1577 1578 switch (vpar) { 1579 case 0: /* erase from cursor to end of line */ 1580 offset = 0; 1581 count = vc->vc_cols - vc->state.x; 1582 break; 1583 case 1: /* erase from start of line to cursor */ 1584 offset = -vc->state.x; 1585 count = vc->state.x + 1; 1586 break; 1587 case 2: /* erase whole line */ 1588 offset = -vc->state.x; 1589 count = vc->vc_cols; 1590 break; 1591 default: 1592 return; 1593 } 1594 vc_uniscr_clear_line(vc, vc->state.x + offset, count); 1595 scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count); 1596 vc->vc_need_wrap = 0; 1597 if (con_should_update(vc)) 1598 do_update_region(vc, (unsigned long)(start + offset), count); 1599 } 1600 1601 /* erase the following vpar positions */ 1602 static void csi_X(struct vc_data *vc, unsigned int vpar) 1603 { /* not vt100? */ 1604 unsigned int count; 1605 1606 if (!vpar) 1607 vpar++; 1608 1609 count = min(vpar, vc->vc_cols - vc->state.x); 1610 1611 vc_uniscr_clear_line(vc, vc->state.x, count); 1612 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count); 1613 if (con_should_update(vc)) 1614 vc->vc_sw->con_clear(vc, vc->state.y, vc->state.x, 1, count); 1615 vc->vc_need_wrap = 0; 1616 } 1617 1618 static void default_attr(struct vc_data *vc) 1619 { 1620 vc->state.intensity = VCI_NORMAL; 1621 vc->state.italic = false; 1622 vc->state.underline = false; 1623 vc->state.reverse = false; 1624 vc->state.blink = false; 1625 vc->state.color = vc->vc_def_color; 1626 } 1627 1628 struct rgb { u8 r; u8 g; u8 b; }; 1629 1630 static void rgb_from_256(int i, struct rgb *c) 1631 { 1632 if (i < 8) { /* Standard colours. */ 1633 c->r = i&1 ? 0xaa : 0x00; 1634 c->g = i&2 ? 0xaa : 0x00; 1635 c->b = i&4 ? 0xaa : 0x00; 1636 } else if (i < 16) { 1637 c->r = i&1 ? 0xff : 0x55; 1638 c->g = i&2 ? 0xff : 0x55; 1639 c->b = i&4 ? 0xff : 0x55; 1640 } else if (i < 232) { /* 6x6x6 colour cube. */ 1641 c->r = (i - 16) / 36 * 85 / 2; 1642 c->g = (i - 16) / 6 % 6 * 85 / 2; 1643 c->b = (i - 16) % 6 * 85 / 2; 1644 } else /* Grayscale ramp. */ 1645 c->r = c->g = c->b = i * 10 - 2312; 1646 } 1647 1648 static void rgb_foreground(struct vc_data *vc, const struct rgb *c) 1649 { 1650 u8 hue = 0, max = max3(c->r, c->g, c->b); 1651 1652 if (c->r > max / 2) 1653 hue |= 4; 1654 if (c->g > max / 2) 1655 hue |= 2; 1656 if (c->b > max / 2) 1657 hue |= 1; 1658 1659 if (hue == 7 && max <= 0x55) { 1660 hue = 0; 1661 vc->state.intensity = VCI_BOLD; 1662 } else if (max > 0xaa) 1663 vc->state.intensity = VCI_BOLD; 1664 else 1665 vc->state.intensity = VCI_NORMAL; 1666 1667 vc->state.color = (vc->state.color & 0xf0) | hue; 1668 } 1669 1670 static void rgb_background(struct vc_data *vc, const struct rgb *c) 1671 { 1672 /* For backgrounds, err on the dark side. */ 1673 vc->state.color = (vc->state.color & 0x0f) 1674 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3; 1675 } 1676 1677 /* 1678 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes 1679 * and thus need to be detected and ignored by hand. That standard also 1680 * wants : rather than ; as separators but sequences containing : are currently 1681 * completely ignored by the parser. 1682 * 1683 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in 1684 * supporting them. 1685 */ 1686 static int vc_t416_color(struct vc_data *vc, int i, 1687 void(*set_color)(struct vc_data *vc, const struct rgb *c)) 1688 { 1689 struct rgb c; 1690 1691 i++; 1692 if (i > vc->vc_npar) 1693 return i; 1694 1695 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) { 1696 /* 256 colours */ 1697 i++; 1698 rgb_from_256(vc->vc_par[i], &c); 1699 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) { 1700 /* 24 bit */ 1701 c.r = vc->vc_par[i + 1]; 1702 c.g = vc->vc_par[i + 2]; 1703 c.b = vc->vc_par[i + 3]; 1704 i += 3; 1705 } else 1706 return i; 1707 1708 set_color(vc, &c); 1709 1710 return i; 1711 } 1712 1713 /* console_lock is held */ 1714 static void csi_m(struct vc_data *vc) 1715 { 1716 int i; 1717 1718 for (i = 0; i <= vc->vc_npar; i++) 1719 switch (vc->vc_par[i]) { 1720 case 0: /* all attributes off */ 1721 default_attr(vc); 1722 break; 1723 case 1: 1724 vc->state.intensity = VCI_BOLD; 1725 break; 1726 case 2: 1727 vc->state.intensity = VCI_HALF_BRIGHT; 1728 break; 1729 case 3: 1730 vc->state.italic = true; 1731 break; 1732 case 21: 1733 /* 1734 * No console drivers support double underline, so 1735 * convert it to a single underline. 1736 */ 1737 case 4: 1738 vc->state.underline = true; 1739 break; 1740 case 5: 1741 vc->state.blink = true; 1742 break; 1743 case 7: 1744 vc->state.reverse = true; 1745 break; 1746 case 10: /* ANSI X3.64-1979 (SCO-ish?) 1747 * Select primary font, don't display control chars if 1748 * defined, don't set bit 8 on output. 1749 */ 1750 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset], vc); 1751 vc->vc_disp_ctrl = 0; 1752 vc->vc_toggle_meta = 0; 1753 break; 1754 case 11: /* ANSI X3.64-1979 (SCO-ish?) 1755 * Select first alternate font, lets chars < 32 be 1756 * displayed as ROM chars. 1757 */ 1758 vc->vc_translate = set_translate(IBMPC_MAP, vc); 1759 vc->vc_disp_ctrl = 1; 1760 vc->vc_toggle_meta = 0; 1761 break; 1762 case 12: /* ANSI X3.64-1979 (SCO-ish?) 1763 * Select second alternate font, toggle high bit 1764 * before displaying as ROM char. 1765 */ 1766 vc->vc_translate = set_translate(IBMPC_MAP, vc); 1767 vc->vc_disp_ctrl = 1; 1768 vc->vc_toggle_meta = 1; 1769 break; 1770 case 22: 1771 vc->state.intensity = VCI_NORMAL; 1772 break; 1773 case 23: 1774 vc->state.italic = false; 1775 break; 1776 case 24: 1777 vc->state.underline = false; 1778 break; 1779 case 25: 1780 vc->state.blink = false; 1781 break; 1782 case 27: 1783 vc->state.reverse = false; 1784 break; 1785 case 38: 1786 i = vc_t416_color(vc, i, rgb_foreground); 1787 break; 1788 case 48: 1789 i = vc_t416_color(vc, i, rgb_background); 1790 break; 1791 case 39: 1792 vc->state.color = (vc->vc_def_color & 0x0f) | 1793 (vc->state.color & 0xf0); 1794 break; 1795 case 49: 1796 vc->state.color = (vc->vc_def_color & 0xf0) | 1797 (vc->state.color & 0x0f); 1798 break; 1799 default: 1800 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) { 1801 if (vc->vc_par[i] < 100) 1802 vc->state.intensity = VCI_BOLD; 1803 vc->vc_par[i] -= 60; 1804 } 1805 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37) 1806 vc->state.color = color_table[vc->vc_par[i] - 30] 1807 | (vc->state.color & 0xf0); 1808 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47) 1809 vc->state.color = (color_table[vc->vc_par[i] - 40] << 4) 1810 | (vc->state.color & 0x0f); 1811 break; 1812 } 1813 update_attr(vc); 1814 } 1815 1816 static void respond_string(const char *p, size_t len, struct tty_port *port) 1817 { 1818 tty_insert_flip_string(port, p, len); 1819 tty_schedule_flip(port); 1820 } 1821 1822 static void cursor_report(struct vc_data *vc, struct tty_struct *tty) 1823 { 1824 char buf[40]; 1825 int len; 1826 1827 len = sprintf(buf, "\033[%d;%dR", vc->state.y + 1828 (vc->vc_decom ? vc->vc_top + 1 : 1), 1829 vc->state.x + 1); 1830 respond_string(buf, len, tty->port); 1831 } 1832 1833 static inline void status_report(struct tty_struct *tty) 1834 { 1835 static const char teminal_ok[] = "\033[0n"; 1836 1837 respond_string(teminal_ok, strlen(teminal_ok), tty->port); 1838 } 1839 1840 static inline void respond_ID(struct tty_struct *tty) 1841 { 1842 /* terminal answer to an ESC-Z or csi0c query. */ 1843 static const char vt102_id[] = "\033[?6c"; 1844 1845 respond_string(vt102_id, strlen(vt102_id), tty->port); 1846 } 1847 1848 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry) 1849 { 1850 char buf[8]; 1851 int len; 1852 1853 len = sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), 1854 (char)('!' + mrx), (char)('!' + mry)); 1855 respond_string(buf, len, tty->port); 1856 } 1857 1858 /* invoked via ioctl(TIOCLINUX) and through set_selection_user */ 1859 int mouse_reporting(void) 1860 { 1861 return vc_cons[fg_console].d->vc_report_mouse; 1862 } 1863 1864 /* console_lock is held */ 1865 static void set_mode(struct vc_data *vc, int on_off) 1866 { 1867 int i; 1868 1869 for (i = 0; i <= vc->vc_npar; i++) 1870 if (vc->vc_priv == EPdec) { 1871 switch(vc->vc_par[i]) { /* DEC private modes set/reset */ 1872 case 1: /* Cursor keys send ^[Ox/^[[x */ 1873 if (on_off) 1874 set_kbd(vc, decckm); 1875 else 1876 clr_kbd(vc, decckm); 1877 break; 1878 case 3: /* 80/132 mode switch unimplemented */ 1879 #if 0 1880 vc_resize(deccolm ? 132 : 80, vc->vc_rows); 1881 /* this alone does not suffice; some user mode 1882 utility has to change the hardware regs */ 1883 #endif 1884 break; 1885 case 5: /* Inverted screen on/off */ 1886 if (vc->vc_decscnm != on_off) { 1887 vc->vc_decscnm = on_off; 1888 invert_screen(vc, 0, 1889 vc->vc_screenbuf_size, 1890 false); 1891 update_attr(vc); 1892 } 1893 break; 1894 case 6: /* Origin relative/absolute */ 1895 vc->vc_decom = on_off; 1896 gotoxay(vc, 0, 0); 1897 break; 1898 case 7: /* Autowrap on/off */ 1899 vc->vc_decawm = on_off; 1900 break; 1901 case 8: /* Autorepeat on/off */ 1902 if (on_off) 1903 set_kbd(vc, decarm); 1904 else 1905 clr_kbd(vc, decarm); 1906 break; 1907 case 9: 1908 vc->vc_report_mouse = on_off ? 1 : 0; 1909 break; 1910 case 25: /* Cursor on/off */ 1911 vc->vc_deccm = on_off; 1912 break; 1913 case 1000: 1914 vc->vc_report_mouse = on_off ? 2 : 0; 1915 break; 1916 } 1917 } else { 1918 switch(vc->vc_par[i]) { /* ANSI modes set/reset */ 1919 case 3: /* Monitor (display ctrls) */ 1920 vc->vc_disp_ctrl = on_off; 1921 break; 1922 case 4: /* Insert Mode on/off */ 1923 vc->vc_decim = on_off; 1924 break; 1925 case 20: /* Lf, Enter == CrLf/Lf */ 1926 if (on_off) 1927 set_kbd(vc, lnm); 1928 else 1929 clr_kbd(vc, lnm); 1930 break; 1931 } 1932 } 1933 } 1934 1935 /* console_lock is held */ 1936 static void setterm_command(struct vc_data *vc) 1937 { 1938 switch (vc->vc_par[0]) { 1939 case 1: /* set color for underline mode */ 1940 if (vc->vc_can_do_color && vc->vc_par[1] < 16) { 1941 vc->vc_ulcolor = color_table[vc->vc_par[1]]; 1942 if (vc->state.underline) 1943 update_attr(vc); 1944 } 1945 break; 1946 case 2: /* set color for half intensity mode */ 1947 if (vc->vc_can_do_color && vc->vc_par[1] < 16) { 1948 vc->vc_halfcolor = color_table[vc->vc_par[1]]; 1949 if (vc->state.intensity == VCI_HALF_BRIGHT) 1950 update_attr(vc); 1951 } 1952 break; 1953 case 8: /* store colors as defaults */ 1954 vc->vc_def_color = vc->vc_attr; 1955 if (vc->vc_hi_font_mask == 0x100) 1956 vc->vc_def_color >>= 1; 1957 default_attr(vc); 1958 update_attr(vc); 1959 break; 1960 case 9: /* set blanking interval */ 1961 blankinterval = min(vc->vc_par[1], 60U) * 60; 1962 poke_blanked_console(); 1963 break; 1964 case 10: /* set bell frequency in Hz */ 1965 if (vc->vc_npar >= 1) 1966 vc->vc_bell_pitch = vc->vc_par[1]; 1967 else 1968 vc->vc_bell_pitch = DEFAULT_BELL_PITCH; 1969 break; 1970 case 11: /* set bell duration in msec */ 1971 if (vc->vc_npar >= 1) 1972 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ? 1973 msecs_to_jiffies(vc->vc_par[1]) : 0; 1974 else 1975 vc->vc_bell_duration = DEFAULT_BELL_DURATION; 1976 break; 1977 case 12: /* bring specified console to the front */ 1978 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1)) 1979 set_console(vc->vc_par[1] - 1); 1980 break; 1981 case 13: /* unblank the screen */ 1982 poke_blanked_console(); 1983 break; 1984 case 14: /* set vesa powerdown interval */ 1985 vesa_off_interval = min(vc->vc_par[1], 60U) * 60 * HZ; 1986 break; 1987 case 15: /* activate the previous console */ 1988 set_console(last_console); 1989 break; 1990 case 16: /* set cursor blink duration in msec */ 1991 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 && 1992 vc->vc_par[1] <= USHRT_MAX) 1993 vc->vc_cur_blink_ms = vc->vc_par[1]; 1994 else 1995 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS; 1996 break; 1997 } 1998 } 1999 2000 /* console_lock is held */ 2001 static void csi_at(struct vc_data *vc, unsigned int nr) 2002 { 2003 if (nr > vc->vc_cols - vc->state.x) 2004 nr = vc->vc_cols - vc->state.x; 2005 else if (!nr) 2006 nr = 1; 2007 insert_char(vc, nr); 2008 } 2009 2010 /* console_lock is held */ 2011 static void csi_L(struct vc_data *vc, unsigned int nr) 2012 { 2013 if (nr > vc->vc_rows - vc->state.y) 2014 nr = vc->vc_rows - vc->state.y; 2015 else if (!nr) 2016 nr = 1; 2017 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_DOWN, nr); 2018 vc->vc_need_wrap = 0; 2019 } 2020 2021 /* console_lock is held */ 2022 static void csi_P(struct vc_data *vc, unsigned int nr) 2023 { 2024 if (nr > vc->vc_cols - vc->state.x) 2025 nr = vc->vc_cols - vc->state.x; 2026 else if (!nr) 2027 nr = 1; 2028 delete_char(vc, nr); 2029 } 2030 2031 /* console_lock is held */ 2032 static void csi_M(struct vc_data *vc, unsigned int nr) 2033 { 2034 if (nr > vc->vc_rows - vc->state.y) 2035 nr = vc->vc_rows - vc->state.y; 2036 else if (!nr) 2037 nr=1; 2038 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_UP, nr); 2039 vc->vc_need_wrap = 0; 2040 } 2041 2042 /* console_lock is held (except via vc_init->reset_terminal */ 2043 static void save_cur(struct vc_data *vc) 2044 { 2045 memcpy(&vc->saved_state, &vc->state, sizeof(vc->state)); 2046 } 2047 2048 /* console_lock is held */ 2049 static void restore_cur(struct vc_data *vc) 2050 { 2051 memcpy(&vc->state, &vc->saved_state, sizeof(vc->state)); 2052 2053 gotoxy(vc, vc->state.x, vc->state.y); 2054 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset], 2055 vc); 2056 update_attr(vc); 2057 vc->vc_need_wrap = 0; 2058 } 2059 2060 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey, 2061 EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd, 2062 ESpalette, ESosc, ESapc, ESpm, ESdcs }; 2063 2064 /* console_lock is held (except via vc_init()) */ 2065 static void reset_terminal(struct vc_data *vc, int do_clear) 2066 { 2067 unsigned int i; 2068 2069 vc->vc_top = 0; 2070 vc->vc_bottom = vc->vc_rows; 2071 vc->vc_state = ESnormal; 2072 vc->vc_priv = EPecma; 2073 vc->vc_translate = set_translate(LAT1_MAP, vc); 2074 vc->state.Gx_charset[0] = LAT1_MAP; 2075 vc->state.Gx_charset[1] = GRAF_MAP; 2076 vc->state.charset = 0; 2077 vc->vc_need_wrap = 0; 2078 vc->vc_report_mouse = 0; 2079 vc->vc_utf = default_utf8; 2080 vc->vc_utf_count = 0; 2081 2082 vc->vc_disp_ctrl = 0; 2083 vc->vc_toggle_meta = 0; 2084 2085 vc->vc_decscnm = 0; 2086 vc->vc_decom = 0; 2087 vc->vc_decawm = 1; 2088 vc->vc_deccm = global_cursor_default; 2089 vc->vc_decim = 0; 2090 2091 vt_reset_keyboard(vc->vc_num); 2092 2093 vc->vc_cursor_type = cur_default; 2094 vc->vc_complement_mask = vc->vc_s_complement_mask; 2095 2096 default_attr(vc); 2097 update_attr(vc); 2098 2099 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT); 2100 for (i = 0; i < VC_TABSTOPS_COUNT; i += 8) 2101 set_bit(i, vc->vc_tab_stop); 2102 2103 vc->vc_bell_pitch = DEFAULT_BELL_PITCH; 2104 vc->vc_bell_duration = DEFAULT_BELL_DURATION; 2105 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS; 2106 2107 gotoxy(vc, 0, 0); 2108 save_cur(vc); 2109 if (do_clear) 2110 csi_J(vc, 2); 2111 } 2112 2113 static void vc_setGx(struct vc_data *vc, unsigned int which, int c) 2114 { 2115 unsigned char *charset = &vc->state.Gx_charset[which]; 2116 2117 switch (c) { 2118 case '0': 2119 *charset = GRAF_MAP; 2120 break; 2121 case 'B': 2122 *charset = LAT1_MAP; 2123 break; 2124 case 'U': 2125 *charset = IBMPC_MAP; 2126 break; 2127 case 'K': 2128 *charset = USER_MAP; 2129 break; 2130 } 2131 2132 if (vc->state.charset == which) 2133 vc->vc_translate = set_translate(*charset, vc); 2134 } 2135 2136 /* is this state an ANSI control string? */ 2137 static bool ansi_control_string(unsigned int state) 2138 { 2139 if (state == ESosc || state == ESapc || state == ESpm || state == ESdcs) 2140 return true; 2141 return false; 2142 } 2143 2144 /* console_lock is held */ 2145 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c) 2146 { 2147 /* 2148 * Control characters can be used in the _middle_ 2149 * of an escape sequence, aside from ANSI control strings. 2150 */ 2151 if (ansi_control_string(vc->vc_state) && c >= 8 && c <= 13) 2152 return; 2153 switch (c) { 2154 case 0: 2155 return; 2156 case 7: 2157 if (ansi_control_string(vc->vc_state)) 2158 vc->vc_state = ESnormal; 2159 else if (vc->vc_bell_duration) 2160 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration); 2161 return; 2162 case 8: 2163 bs(vc); 2164 return; 2165 case 9: 2166 vc->vc_pos -= (vc->state.x << 1); 2167 2168 vc->state.x = find_next_bit(vc->vc_tab_stop, 2169 min(vc->vc_cols - 1, VC_TABSTOPS_COUNT), 2170 vc->state.x + 1); 2171 if (vc->state.x >= VC_TABSTOPS_COUNT) 2172 vc->state.x = vc->vc_cols - 1; 2173 2174 vc->vc_pos += (vc->state.x << 1); 2175 notify_write(vc, '\t'); 2176 return; 2177 case 10: case 11: case 12: 2178 lf(vc); 2179 if (!is_kbd(vc, lnm)) 2180 return; 2181 fallthrough; 2182 case 13: 2183 cr(vc); 2184 return; 2185 case 14: 2186 vc->state.charset = 1; 2187 vc->vc_translate = set_translate(vc->state.Gx_charset[1], vc); 2188 vc->vc_disp_ctrl = 1; 2189 return; 2190 case 15: 2191 vc->state.charset = 0; 2192 vc->vc_translate = set_translate(vc->state.Gx_charset[0], vc); 2193 vc->vc_disp_ctrl = 0; 2194 return; 2195 case 24: case 26: 2196 vc->vc_state = ESnormal; 2197 return; 2198 case 27: 2199 vc->vc_state = ESesc; 2200 return; 2201 case 127: 2202 del(vc); 2203 return; 2204 case 128+27: 2205 vc->vc_state = ESsquare; 2206 return; 2207 } 2208 switch(vc->vc_state) { 2209 case ESesc: 2210 vc->vc_state = ESnormal; 2211 switch (c) { 2212 case '[': 2213 vc->vc_state = ESsquare; 2214 return; 2215 case ']': 2216 vc->vc_state = ESnonstd; 2217 return; 2218 case '_': 2219 vc->vc_state = ESapc; 2220 return; 2221 case '^': 2222 vc->vc_state = ESpm; 2223 return; 2224 case '%': 2225 vc->vc_state = ESpercent; 2226 return; 2227 case 'E': 2228 cr(vc); 2229 lf(vc); 2230 return; 2231 case 'M': 2232 ri(vc); 2233 return; 2234 case 'D': 2235 lf(vc); 2236 return; 2237 case 'H': 2238 if (vc->state.x < VC_TABSTOPS_COUNT) 2239 set_bit(vc->state.x, vc->vc_tab_stop); 2240 return; 2241 case 'P': 2242 vc->vc_state = ESdcs; 2243 return; 2244 case 'Z': 2245 respond_ID(tty); 2246 return; 2247 case '7': 2248 save_cur(vc); 2249 return; 2250 case '8': 2251 restore_cur(vc); 2252 return; 2253 case '(': 2254 vc->vc_state = ESsetG0; 2255 return; 2256 case ')': 2257 vc->vc_state = ESsetG1; 2258 return; 2259 case '#': 2260 vc->vc_state = EShash; 2261 return; 2262 case 'c': 2263 reset_terminal(vc, 1); 2264 return; 2265 case '>': /* Numeric keypad */ 2266 clr_kbd(vc, kbdapplic); 2267 return; 2268 case '=': /* Appl. keypad */ 2269 set_kbd(vc, kbdapplic); 2270 return; 2271 } 2272 return; 2273 case ESnonstd: 2274 if (c=='P') { /* palette escape sequence */ 2275 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++) 2276 vc->vc_par[vc->vc_npar] = 0; 2277 vc->vc_npar = 0; 2278 vc->vc_state = ESpalette; 2279 return; 2280 } else if (c=='R') { /* reset palette */ 2281 reset_palette(vc); 2282 vc->vc_state = ESnormal; 2283 } else if (c>='0' && c<='9') 2284 vc->vc_state = ESosc; 2285 else 2286 vc->vc_state = ESnormal; 2287 return; 2288 case ESpalette: 2289 if (isxdigit(c)) { 2290 vc->vc_par[vc->vc_npar++] = hex_to_bin(c); 2291 if (vc->vc_npar == 7) { 2292 int i = vc->vc_par[0] * 3, j = 1; 2293 vc->vc_palette[i] = 16 * vc->vc_par[j++]; 2294 vc->vc_palette[i++] += vc->vc_par[j++]; 2295 vc->vc_palette[i] = 16 * vc->vc_par[j++]; 2296 vc->vc_palette[i++] += vc->vc_par[j++]; 2297 vc->vc_palette[i] = 16 * vc->vc_par[j++]; 2298 vc->vc_palette[i] += vc->vc_par[j]; 2299 set_palette(vc); 2300 vc->vc_state = ESnormal; 2301 } 2302 } else 2303 vc->vc_state = ESnormal; 2304 return; 2305 case ESsquare: 2306 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++) 2307 vc->vc_par[vc->vc_npar] = 0; 2308 vc->vc_npar = 0; 2309 vc->vc_state = ESgetpars; 2310 if (c == '[') { /* Function key */ 2311 vc->vc_state=ESfunckey; 2312 return; 2313 } 2314 switch (c) { 2315 case '?': 2316 vc->vc_priv = EPdec; 2317 return; 2318 case '>': 2319 vc->vc_priv = EPgt; 2320 return; 2321 case '=': 2322 vc->vc_priv = EPeq; 2323 return; 2324 case '<': 2325 vc->vc_priv = EPlt; 2326 return; 2327 } 2328 vc->vc_priv = EPecma; 2329 fallthrough; 2330 case ESgetpars: 2331 if (c == ';' && vc->vc_npar < NPAR - 1) { 2332 vc->vc_npar++; 2333 return; 2334 } else if (c>='0' && c<='9') { 2335 vc->vc_par[vc->vc_npar] *= 10; 2336 vc->vc_par[vc->vc_npar] += c - '0'; 2337 return; 2338 } 2339 if (c >= 0x20 && c <= 0x3f) { /* 0x2x, 0x3a and 0x3c - 0x3f */ 2340 vc->vc_state = EScsiignore; 2341 return; 2342 } 2343 vc->vc_state = ESnormal; 2344 switch(c) { 2345 case 'h': 2346 if (vc->vc_priv <= EPdec) 2347 set_mode(vc, 1); 2348 return; 2349 case 'l': 2350 if (vc->vc_priv <= EPdec) 2351 set_mode(vc, 0); 2352 return; 2353 case 'c': 2354 if (vc->vc_priv == EPdec) { 2355 if (vc->vc_par[0]) 2356 vc->vc_cursor_type = 2357 CUR_MAKE(vc->vc_par[0], 2358 vc->vc_par[1], 2359 vc->vc_par[2]); 2360 else 2361 vc->vc_cursor_type = cur_default; 2362 return; 2363 } 2364 break; 2365 case 'm': 2366 if (vc->vc_priv == EPdec) { 2367 clear_selection(); 2368 if (vc->vc_par[0]) 2369 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1]; 2370 else 2371 vc->vc_complement_mask = vc->vc_s_complement_mask; 2372 return; 2373 } 2374 break; 2375 case 'n': 2376 if (vc->vc_priv == EPecma) { 2377 if (vc->vc_par[0] == 5) 2378 status_report(tty); 2379 else if (vc->vc_par[0] == 6) 2380 cursor_report(vc, tty); 2381 } 2382 return; 2383 } 2384 if (vc->vc_priv != EPecma) { 2385 vc->vc_priv = EPecma; 2386 return; 2387 } 2388 switch(c) { 2389 case 'G': case '`': 2390 if (vc->vc_par[0]) 2391 vc->vc_par[0]--; 2392 gotoxy(vc, vc->vc_par[0], vc->state.y); 2393 return; 2394 case 'A': 2395 if (!vc->vc_par[0]) 2396 vc->vc_par[0]++; 2397 gotoxy(vc, vc->state.x, vc->state.y - vc->vc_par[0]); 2398 return; 2399 case 'B': case 'e': 2400 if (!vc->vc_par[0]) 2401 vc->vc_par[0]++; 2402 gotoxy(vc, vc->state.x, vc->state.y + vc->vc_par[0]); 2403 return; 2404 case 'C': case 'a': 2405 if (!vc->vc_par[0]) 2406 vc->vc_par[0]++; 2407 gotoxy(vc, vc->state.x + vc->vc_par[0], vc->state.y); 2408 return; 2409 case 'D': 2410 if (!vc->vc_par[0]) 2411 vc->vc_par[0]++; 2412 gotoxy(vc, vc->state.x - vc->vc_par[0], vc->state.y); 2413 return; 2414 case 'E': 2415 if (!vc->vc_par[0]) 2416 vc->vc_par[0]++; 2417 gotoxy(vc, 0, vc->state.y + vc->vc_par[0]); 2418 return; 2419 case 'F': 2420 if (!vc->vc_par[0]) 2421 vc->vc_par[0]++; 2422 gotoxy(vc, 0, vc->state.y - vc->vc_par[0]); 2423 return; 2424 case 'd': 2425 if (vc->vc_par[0]) 2426 vc->vc_par[0]--; 2427 gotoxay(vc, vc->state.x ,vc->vc_par[0]); 2428 return; 2429 case 'H': case 'f': 2430 if (vc->vc_par[0]) 2431 vc->vc_par[0]--; 2432 if (vc->vc_par[1]) 2433 vc->vc_par[1]--; 2434 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]); 2435 return; 2436 case 'J': 2437 csi_J(vc, vc->vc_par[0]); 2438 return; 2439 case 'K': 2440 csi_K(vc, vc->vc_par[0]); 2441 return; 2442 case 'L': 2443 csi_L(vc, vc->vc_par[0]); 2444 return; 2445 case 'M': 2446 csi_M(vc, vc->vc_par[0]); 2447 return; 2448 case 'P': 2449 csi_P(vc, vc->vc_par[0]); 2450 return; 2451 case 'c': 2452 if (!vc->vc_par[0]) 2453 respond_ID(tty); 2454 return; 2455 case 'g': 2456 if (!vc->vc_par[0] && vc->state.x < VC_TABSTOPS_COUNT) 2457 set_bit(vc->state.x, vc->vc_tab_stop); 2458 else if (vc->vc_par[0] == 3) 2459 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT); 2460 return; 2461 case 'm': 2462 csi_m(vc); 2463 return; 2464 case 'q': /* DECLL - but only 3 leds */ 2465 /* map 0,1,2,3 to 0,1,2,4 */ 2466 if (vc->vc_par[0] < 4) 2467 vt_set_led_state(vc->vc_num, 2468 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4); 2469 return; 2470 case 'r': 2471 if (!vc->vc_par[0]) 2472 vc->vc_par[0]++; 2473 if (!vc->vc_par[1]) 2474 vc->vc_par[1] = vc->vc_rows; 2475 /* Minimum allowed region is 2 lines */ 2476 if (vc->vc_par[0] < vc->vc_par[1] && 2477 vc->vc_par[1] <= vc->vc_rows) { 2478 vc->vc_top = vc->vc_par[0] - 1; 2479 vc->vc_bottom = vc->vc_par[1]; 2480 gotoxay(vc, 0, 0); 2481 } 2482 return; 2483 case 's': 2484 save_cur(vc); 2485 return; 2486 case 'u': 2487 restore_cur(vc); 2488 return; 2489 case 'X': 2490 csi_X(vc, vc->vc_par[0]); 2491 return; 2492 case '@': 2493 csi_at(vc, vc->vc_par[0]); 2494 return; 2495 case ']': /* setterm functions */ 2496 setterm_command(vc); 2497 return; 2498 } 2499 return; 2500 case EScsiignore: 2501 if (c >= 20 && c <= 0x3f) 2502 return; 2503 vc->vc_state = ESnormal; 2504 return; 2505 case ESpercent: 2506 vc->vc_state = ESnormal; 2507 switch (c) { 2508 case '@': /* defined in ISO 2022 */ 2509 vc->vc_utf = 0; 2510 return; 2511 case 'G': /* prelim official escape code */ 2512 case '8': /* retained for compatibility */ 2513 vc->vc_utf = 1; 2514 return; 2515 } 2516 return; 2517 case ESfunckey: 2518 vc->vc_state = ESnormal; 2519 return; 2520 case EShash: 2521 vc->vc_state = ESnormal; 2522 if (c == '8') { 2523 /* DEC screen alignment test. kludge :-) */ 2524 vc->vc_video_erase_char = 2525 (vc->vc_video_erase_char & 0xff00) | 'E'; 2526 csi_J(vc, 2); 2527 vc->vc_video_erase_char = 2528 (vc->vc_video_erase_char & 0xff00) | ' '; 2529 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2); 2530 } 2531 return; 2532 case ESsetG0: 2533 vc_setGx(vc, 0, c); 2534 vc->vc_state = ESnormal; 2535 return; 2536 case ESsetG1: 2537 vc_setGx(vc, 1, c); 2538 vc->vc_state = ESnormal; 2539 return; 2540 case ESapc: 2541 return; 2542 case ESosc: 2543 return; 2544 case ESpm: 2545 return; 2546 case ESdcs: 2547 return; 2548 default: 2549 vc->vc_state = ESnormal; 2550 } 2551 } 2552 2553 /* is_double_width() is based on the wcwidth() implementation by 2554 * Markus Kuhn -- 2007-05-26 (Unicode 5.0) 2555 * Latest version: https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c 2556 */ 2557 struct interval { 2558 uint32_t first; 2559 uint32_t last; 2560 }; 2561 2562 static int ucs_cmp(const void *key, const void *elt) 2563 { 2564 uint32_t ucs = *(uint32_t *)key; 2565 struct interval e = *(struct interval *) elt; 2566 2567 if (ucs > e.last) 2568 return 1; 2569 else if (ucs < e.first) 2570 return -1; 2571 return 0; 2572 } 2573 2574 static int is_double_width(uint32_t ucs) 2575 { 2576 static const struct interval double_width[] = { 2577 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E }, 2578 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF }, 2579 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 }, 2580 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD } 2581 }; 2582 if (ucs < double_width[0].first || 2583 ucs > double_width[ARRAY_SIZE(double_width) - 1].last) 2584 return 0; 2585 2586 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width), 2587 sizeof(struct interval), ucs_cmp) != NULL; 2588 } 2589 2590 struct vc_draw_region { 2591 unsigned long from, to; 2592 int x; 2593 }; 2594 2595 static void con_flush(struct vc_data *vc, struct vc_draw_region *draw) 2596 { 2597 if (draw->x < 0) 2598 return; 2599 2600 vc->vc_sw->con_putcs(vc, (u16 *)draw->from, 2601 (u16 *)draw->to - (u16 *)draw->from, vc->state.y, 2602 draw->x); 2603 draw->x = -1; 2604 } 2605 2606 static inline int vc_translate_ascii(const struct vc_data *vc, int c) 2607 { 2608 if (IS_ENABLED(CONFIG_CONSOLE_TRANSLATIONS)) { 2609 if (vc->vc_toggle_meta) 2610 c |= 0x80; 2611 2612 return vc->vc_translate[c]; 2613 } 2614 2615 return c; 2616 } 2617 2618 2619 /** 2620 * vc_sanitize_unicode -- Replace invalid Unicode code points with U+FFFD 2621 * @c: the received character, or U+FFFD for invalid sequences. 2622 */ 2623 static inline int vc_sanitize_unicode(const int c) 2624 { 2625 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff) 2626 return 0xfffd; 2627 2628 return c; 2629 } 2630 2631 /** 2632 * vc_translate_unicode -- Combine UTF-8 into Unicode in @vc_utf_char 2633 * @vc: virtual console 2634 * @c: character to translate 2635 * @rescan: we return true if we need more (continuation) data 2636 * 2637 * @vc_utf_char is the being-constructed unicode character. 2638 * @vc_utf_count is the number of continuation bytes still expected to arrive. 2639 * @vc_npar is the number of continuation bytes arrived so far. 2640 */ 2641 static int vc_translate_unicode(struct vc_data *vc, int c, bool *rescan) 2642 { 2643 static const u32 utf8_length_changes[] = { 2644 0x0000007f, 0x000007ff, 0x0000ffff, 2645 0x001fffff, 0x03ffffff, 0x7fffffff 2646 }; 2647 2648 /* Continuation byte received */ 2649 if ((c & 0xc0) == 0x80) { 2650 /* Unexpected continuation byte? */ 2651 if (!vc->vc_utf_count) 2652 return 0xfffd; 2653 2654 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f); 2655 vc->vc_npar++; 2656 if (--vc->vc_utf_count) 2657 goto need_more_bytes; 2658 2659 /* Got a whole character */ 2660 c = vc->vc_utf_char; 2661 /* Reject overlong sequences */ 2662 if (c <= utf8_length_changes[vc->vc_npar - 1] || 2663 c > utf8_length_changes[vc->vc_npar]) 2664 return 0xfffd; 2665 2666 return vc_sanitize_unicode(c); 2667 } 2668 2669 /* Single ASCII byte or first byte of a sequence received */ 2670 if (vc->vc_utf_count) { 2671 /* Continuation byte expected */ 2672 *rescan = true; 2673 vc->vc_utf_count = 0; 2674 return 0xfffd; 2675 } 2676 2677 /* Nothing to do if an ASCII byte was received */ 2678 if (c <= 0x7f) 2679 return c; 2680 2681 /* First byte of a multibyte sequence received */ 2682 vc->vc_npar = 0; 2683 if ((c & 0xe0) == 0xc0) { 2684 vc->vc_utf_count = 1; 2685 vc->vc_utf_char = (c & 0x1f); 2686 } else if ((c & 0xf0) == 0xe0) { 2687 vc->vc_utf_count = 2; 2688 vc->vc_utf_char = (c & 0x0f); 2689 } else if ((c & 0xf8) == 0xf0) { 2690 vc->vc_utf_count = 3; 2691 vc->vc_utf_char = (c & 0x07); 2692 } else if ((c & 0xfc) == 0xf8) { 2693 vc->vc_utf_count = 4; 2694 vc->vc_utf_char = (c & 0x03); 2695 } else if ((c & 0xfe) == 0xfc) { 2696 vc->vc_utf_count = 5; 2697 vc->vc_utf_char = (c & 0x01); 2698 } else { 2699 /* 254 and 255 are invalid */ 2700 return 0xfffd; 2701 } 2702 2703 need_more_bytes: 2704 return -1; 2705 } 2706 2707 static int vc_translate(struct vc_data *vc, int *c, bool *rescan) 2708 { 2709 /* Do no translation at all in control states */ 2710 if (vc->vc_state != ESnormal) 2711 return *c; 2712 2713 if (vc->vc_utf && !vc->vc_disp_ctrl) 2714 return *c = vc_translate_unicode(vc, *c, rescan); 2715 2716 /* no utf or alternate charset mode */ 2717 return vc_translate_ascii(vc, *c); 2718 } 2719 2720 static inline unsigned char vc_invert_attr(const struct vc_data *vc) 2721 { 2722 if (!vc->vc_can_do_color) 2723 return vc->vc_attr ^ 0x08; 2724 2725 if (vc->vc_hi_font_mask == 0x100) 2726 return (vc->vc_attr & 0x11) | 2727 ((vc->vc_attr & 0xe0) >> 4) | 2728 ((vc->vc_attr & 0x0e) << 4); 2729 2730 return (vc->vc_attr & 0x88) | 2731 ((vc->vc_attr & 0x70) >> 4) | 2732 ((vc->vc_attr & 0x07) << 4); 2733 } 2734 2735 static bool vc_is_control(struct vc_data *vc, int tc, int c) 2736 { 2737 /* 2738 * A bitmap for codes <32. A bit of 1 indicates that the code 2739 * corresponding to that bit number invokes some special action (such 2740 * as cursor movement) and should not be displayed as a glyph unless 2741 * the disp_ctrl mode is explicitly enabled. 2742 */ 2743 static const u32 CTRL_ACTION = 0x0d00ff81; 2744 /* Cannot be overridden by disp_ctrl */ 2745 static const u32 CTRL_ALWAYS = 0x0800f501; 2746 2747 if (vc->vc_state != ESnormal) 2748 return true; 2749 2750 if (!tc) 2751 return true; 2752 2753 /* 2754 * If the original code was a control character we only allow a glyph 2755 * to be displayed if the code is not normally used (such as for cursor 2756 * movement) or if the disp_ctrl mode has been explicitly enabled. 2757 * Certain characters (as given by the CTRL_ALWAYS bitmap) are always 2758 * displayed as control characters, as the console would be pretty 2759 * useless without them; to display an arbitrary font position use the 2760 * direct-to-font zone in UTF-8 mode. 2761 */ 2762 if (c < 32) { 2763 if (vc->vc_disp_ctrl) 2764 return CTRL_ALWAYS & BIT(c); 2765 else 2766 return vc->vc_utf || (CTRL_ACTION & BIT(c)); 2767 } 2768 2769 if (c == 127 && !vc->vc_disp_ctrl) 2770 return true; 2771 2772 if (c == 128 + 27) 2773 return true; 2774 2775 return false; 2776 } 2777 2778 static int vc_con_write_normal(struct vc_data *vc, int tc, int c, 2779 struct vc_draw_region *draw) 2780 { 2781 int next_c; 2782 unsigned char vc_attr = vc->vc_attr; 2783 u16 himask = vc->vc_hi_font_mask, charmask = himask ? 0x1ff : 0xff; 2784 u8 width = 1; 2785 bool inverse = false; 2786 2787 if (vc->vc_utf && !vc->vc_disp_ctrl) { 2788 if (is_double_width(c)) 2789 width = 2; 2790 } 2791 2792 /* Now try to find out how to display it */ 2793 tc = conv_uni_to_pc(vc, tc); 2794 if (tc & ~charmask) { 2795 if (tc == -1 || tc == -2) 2796 return -1; /* nothing to display */ 2797 2798 /* Glyph not found */ 2799 if ((!vc->vc_utf || vc->vc_disp_ctrl || c < 128) && 2800 !(c & ~charmask)) { 2801 /* 2802 * In legacy mode use the glyph we get by a 1:1 2803 * mapping. 2804 * This would make absolutely no sense with Unicode in 2805 * mind, but do this for ASCII characters since a font 2806 * may lack Unicode mapping info and we don't want to 2807 * end up with having question marks only. 2808 */ 2809 tc = c; 2810 } else { 2811 /* 2812 * Display U+FFFD. If it's not found, display an inverse 2813 * question mark. 2814 */ 2815 tc = conv_uni_to_pc(vc, 0xfffd); 2816 if (tc < 0) { 2817 inverse = true; 2818 tc = conv_uni_to_pc(vc, '?'); 2819 if (tc < 0) 2820 tc = '?'; 2821 2822 vc_attr = vc_invert_attr(vc); 2823 con_flush(vc, draw); 2824 } 2825 } 2826 } 2827 2828 next_c = c; 2829 while (1) { 2830 if (vc->vc_need_wrap || vc->vc_decim) 2831 con_flush(vc, draw); 2832 if (vc->vc_need_wrap) { 2833 cr(vc); 2834 lf(vc); 2835 } 2836 if (vc->vc_decim) 2837 insert_char(vc, 1); 2838 vc_uniscr_putc(vc, next_c); 2839 2840 if (himask) 2841 tc = ((tc & 0x100) ? himask : 0) | 2842 (tc & 0xff); 2843 tc |= (vc_attr << 8) & ~himask; 2844 2845 scr_writew(tc, (u16 *)vc->vc_pos); 2846 2847 if (con_should_update(vc) && draw->x < 0) { 2848 draw->x = vc->state.x; 2849 draw->from = vc->vc_pos; 2850 } 2851 if (vc->state.x == vc->vc_cols - 1) { 2852 vc->vc_need_wrap = vc->vc_decawm; 2853 draw->to = vc->vc_pos + 2; 2854 } else { 2855 vc->state.x++; 2856 draw->to = (vc->vc_pos += 2); 2857 } 2858 2859 if (!--width) 2860 break; 2861 2862 /* A space is printed in the second column */ 2863 tc = conv_uni_to_pc(vc, ' '); 2864 if (tc < 0) 2865 tc = ' '; 2866 next_c = ' '; 2867 } 2868 notify_write(vc, c); 2869 2870 if (inverse) 2871 con_flush(vc, draw); 2872 2873 return 0; 2874 } 2875 2876 /* acquires console_lock */ 2877 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count) 2878 { 2879 struct vc_draw_region draw = { 2880 .x = -1, 2881 }; 2882 int c, tc, n = 0; 2883 unsigned int currcons; 2884 struct vc_data *vc; 2885 struct vt_notifier_param param; 2886 bool rescan; 2887 2888 if (in_interrupt()) 2889 return count; 2890 2891 console_lock(); 2892 vc = tty->driver_data; 2893 if (vc == NULL) { 2894 pr_err("vt: argh, driver_data is NULL !\n"); 2895 console_unlock(); 2896 return 0; 2897 } 2898 2899 currcons = vc->vc_num; 2900 if (!vc_cons_allocated(currcons)) { 2901 /* could this happen? */ 2902 pr_warn_once("con_write: tty %d not allocated\n", currcons+1); 2903 console_unlock(); 2904 return 0; 2905 } 2906 2907 2908 /* undraw cursor first */ 2909 if (con_is_fg(vc)) 2910 hide_cursor(vc); 2911 2912 param.vc = vc; 2913 2914 while (!tty->flow.stopped && count) { 2915 int orig = *buf; 2916 buf++; 2917 n++; 2918 count--; 2919 rescan_last_byte: 2920 c = orig; 2921 rescan = false; 2922 2923 tc = vc_translate(vc, &c, &rescan); 2924 if (tc == -1) 2925 continue; 2926 2927 param.c = tc; 2928 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE, 2929 ¶m) == NOTIFY_STOP) 2930 continue; 2931 2932 if (vc_is_control(vc, tc, c)) { 2933 con_flush(vc, &draw); 2934 do_con_trol(tty, vc, orig); 2935 continue; 2936 } 2937 2938 if (vc_con_write_normal(vc, tc, c, &draw) < 0) 2939 continue; 2940 2941 if (rescan) 2942 goto rescan_last_byte; 2943 } 2944 con_flush(vc, &draw); 2945 vc_uniscr_debug_check(vc); 2946 console_conditional_schedule(); 2947 notify_update(vc); 2948 console_unlock(); 2949 return n; 2950 } 2951 2952 /* 2953 * This is the console switching callback. 2954 * 2955 * Doing console switching in a process context allows 2956 * us to do the switches asynchronously (needed when we want 2957 * to switch due to a keyboard interrupt). Synchronization 2958 * with other console code and prevention of re-entrancy is 2959 * ensured with console_lock. 2960 */ 2961 static void console_callback(struct work_struct *ignored) 2962 { 2963 console_lock(); 2964 2965 if (want_console >= 0) { 2966 if (want_console != fg_console && 2967 vc_cons_allocated(want_console)) { 2968 hide_cursor(vc_cons[fg_console].d); 2969 change_console(vc_cons[want_console].d); 2970 /* we only changed when the console had already 2971 been allocated - a new console is not created 2972 in an interrupt routine */ 2973 } 2974 want_console = -1; 2975 } 2976 if (do_poke_blanked_console) { /* do not unblank for a LED change */ 2977 do_poke_blanked_console = 0; 2978 poke_blanked_console(); 2979 } 2980 if (scrollback_delta) { 2981 struct vc_data *vc = vc_cons[fg_console].d; 2982 clear_selection(); 2983 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta) 2984 vc->vc_sw->con_scrolldelta(vc, scrollback_delta); 2985 scrollback_delta = 0; 2986 } 2987 if (blank_timer_expired) { 2988 do_blank_screen(0); 2989 blank_timer_expired = 0; 2990 } 2991 notify_update(vc_cons[fg_console].d); 2992 2993 console_unlock(); 2994 } 2995 2996 int set_console(int nr) 2997 { 2998 struct vc_data *vc = vc_cons[fg_console].d; 2999 3000 if (!vc_cons_allocated(nr) || vt_dont_switch || 3001 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) { 3002 3003 /* 3004 * Console switch will fail in console_callback() or 3005 * change_console() so there is no point scheduling 3006 * the callback 3007 * 3008 * Existing set_console() users don't check the return 3009 * value so this shouldn't break anything 3010 */ 3011 return -EINVAL; 3012 } 3013 3014 want_console = nr; 3015 schedule_console_callback(); 3016 3017 return 0; 3018 } 3019 3020 struct tty_driver *console_driver; 3021 3022 #ifdef CONFIG_VT_CONSOLE 3023 3024 /** 3025 * vt_kmsg_redirect() - Sets/gets the kernel message console 3026 * @new: The new virtual terminal number or -1 if the console should stay 3027 * unchanged 3028 * 3029 * By default, the kernel messages are always printed on the current virtual 3030 * console. However, the user may modify that default with the 3031 * TIOCL_SETKMSGREDIRECT ioctl call. 3032 * 3033 * This function sets the kernel message console to be @new. It returns the old 3034 * virtual console number. The virtual terminal number 0 (both as parameter and 3035 * return value) means no redirection (i.e. always printed on the currently 3036 * active console). 3037 * 3038 * The parameter -1 means that only the current console is returned, but the 3039 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that 3040 * case to make the code more understandable. 3041 * 3042 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores 3043 * the parameter and always returns 0. 3044 */ 3045 int vt_kmsg_redirect(int new) 3046 { 3047 static int kmsg_con; 3048 3049 if (new != -1) 3050 return xchg(&kmsg_con, new); 3051 else 3052 return kmsg_con; 3053 } 3054 3055 /* 3056 * Console on virtual terminal 3057 * 3058 * The console must be locked when we get here. 3059 */ 3060 3061 static void vt_console_print(struct console *co, const char *b, unsigned count) 3062 { 3063 struct vc_data *vc = vc_cons[fg_console].d; 3064 unsigned char c; 3065 static DEFINE_SPINLOCK(printing_lock); 3066 const ushort *start; 3067 ushort start_x, cnt; 3068 int kmsg_console; 3069 3070 /* console busy or not yet initialized */ 3071 if (!printable) 3072 return; 3073 if (!spin_trylock(&printing_lock)) 3074 return; 3075 3076 kmsg_console = vt_get_kmsg_redirect(); 3077 if (kmsg_console && vc_cons_allocated(kmsg_console - 1)) 3078 vc = vc_cons[kmsg_console - 1].d; 3079 3080 if (!vc_cons_allocated(fg_console)) { 3081 /* impossible */ 3082 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */ 3083 goto quit; 3084 } 3085 3086 if (vc->vc_mode != KD_TEXT) 3087 goto quit; 3088 3089 /* undraw cursor first */ 3090 if (con_is_fg(vc)) 3091 hide_cursor(vc); 3092 3093 start = (ushort *)vc->vc_pos; 3094 start_x = vc->state.x; 3095 cnt = 0; 3096 while (count--) { 3097 c = *b++; 3098 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) { 3099 if (cnt && con_is_visible(vc)) 3100 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x); 3101 cnt = 0; 3102 if (c == 8) { /* backspace */ 3103 bs(vc); 3104 start = (ushort *)vc->vc_pos; 3105 start_x = vc->state.x; 3106 continue; 3107 } 3108 if (c != 13) 3109 lf(vc); 3110 cr(vc); 3111 start = (ushort *)vc->vc_pos; 3112 start_x = vc->state.x; 3113 if (c == 10 || c == 13) 3114 continue; 3115 } 3116 vc_uniscr_putc(vc, c); 3117 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos); 3118 notify_write(vc, c); 3119 cnt++; 3120 if (vc->state.x == vc->vc_cols - 1) { 3121 vc->vc_need_wrap = 1; 3122 } else { 3123 vc->vc_pos += 2; 3124 vc->state.x++; 3125 } 3126 } 3127 if (cnt && con_is_visible(vc)) 3128 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x); 3129 set_cursor(vc); 3130 notify_update(vc); 3131 3132 quit: 3133 spin_unlock(&printing_lock); 3134 } 3135 3136 static struct tty_driver *vt_console_device(struct console *c, int *index) 3137 { 3138 *index = c->index ? c->index-1 : fg_console; 3139 return console_driver; 3140 } 3141 3142 static struct console vt_console_driver = { 3143 .name = "tty", 3144 .write = vt_console_print, 3145 .device = vt_console_device, 3146 .unblank = unblank_screen, 3147 .flags = CON_PRINTBUFFER, 3148 .index = -1, 3149 }; 3150 #endif 3151 3152 /* 3153 * Handling of Linux-specific VC ioctls 3154 */ 3155 3156 /* 3157 * Generally a bit racy with respect to console_lock();. 3158 * 3159 * There are some functions which don't need it. 3160 * 3161 * There are some functions which can sleep for arbitrary periods 3162 * (paste_selection) but we don't need the lock there anyway. 3163 * 3164 * set_selection_user has locking, and definitely needs it 3165 */ 3166 3167 int tioclinux(struct tty_struct *tty, unsigned long arg) 3168 { 3169 char type, data; 3170 char __user *p = (char __user *)arg; 3171 int lines; 3172 int ret; 3173 3174 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN)) 3175 return -EPERM; 3176 if (get_user(type, p)) 3177 return -EFAULT; 3178 ret = 0; 3179 3180 switch (type) 3181 { 3182 case TIOCL_SETSEL: 3183 ret = set_selection_user((struct tiocl_selection 3184 __user *)(p+1), tty); 3185 break; 3186 case TIOCL_PASTESEL: 3187 ret = paste_selection(tty); 3188 break; 3189 case TIOCL_UNBLANKSCREEN: 3190 console_lock(); 3191 unblank_screen(); 3192 console_unlock(); 3193 break; 3194 case TIOCL_SELLOADLUT: 3195 console_lock(); 3196 ret = sel_loadlut(p); 3197 console_unlock(); 3198 break; 3199 case TIOCL_GETSHIFTSTATE: 3200 3201 /* 3202 * Make it possible to react to Shift+Mousebutton. 3203 * Note that 'shift_state' is an undocumented 3204 * kernel-internal variable; programs not closely 3205 * related to the kernel should not use this. 3206 */ 3207 data = vt_get_shift_state(); 3208 ret = put_user(data, p); 3209 break; 3210 case TIOCL_GETMOUSEREPORTING: 3211 console_lock(); /* May be overkill */ 3212 data = mouse_reporting(); 3213 console_unlock(); 3214 ret = put_user(data, p); 3215 break; 3216 case TIOCL_SETVESABLANK: 3217 console_lock(); 3218 ret = set_vesa_blanking(p); 3219 console_unlock(); 3220 break; 3221 case TIOCL_GETKMSGREDIRECT: 3222 data = vt_get_kmsg_redirect(); 3223 ret = put_user(data, p); 3224 break; 3225 case TIOCL_SETKMSGREDIRECT: 3226 if (!capable(CAP_SYS_ADMIN)) { 3227 ret = -EPERM; 3228 } else { 3229 if (get_user(data, p+1)) 3230 ret = -EFAULT; 3231 else 3232 vt_kmsg_redirect(data); 3233 } 3234 break; 3235 case TIOCL_GETFGCONSOLE: 3236 /* No locking needed as this is a transiently 3237 correct return anyway if the caller hasn't 3238 disabled switching */ 3239 ret = fg_console; 3240 break; 3241 case TIOCL_SCROLLCONSOLE: 3242 if (get_user(lines, (s32 __user *)(p+4))) { 3243 ret = -EFAULT; 3244 } else { 3245 /* Need the console lock here. Note that lots 3246 of other calls need fixing before the lock 3247 is actually useful ! */ 3248 console_lock(); 3249 scrollfront(vc_cons[fg_console].d, lines); 3250 console_unlock(); 3251 ret = 0; 3252 } 3253 break; 3254 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */ 3255 console_lock(); 3256 ignore_poke = 1; 3257 do_blank_screen(0); 3258 console_unlock(); 3259 break; 3260 case TIOCL_BLANKEDSCREEN: 3261 ret = console_blanked; 3262 break; 3263 default: 3264 ret = -EINVAL; 3265 break; 3266 } 3267 return ret; 3268 } 3269 3270 /* 3271 * /dev/ttyN handling 3272 */ 3273 3274 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count) 3275 { 3276 int retval; 3277 3278 retval = do_con_write(tty, buf, count); 3279 con_flush_chars(tty); 3280 3281 return retval; 3282 } 3283 3284 static int con_put_char(struct tty_struct *tty, unsigned char ch) 3285 { 3286 return do_con_write(tty, &ch, 1); 3287 } 3288 3289 static unsigned int con_write_room(struct tty_struct *tty) 3290 { 3291 if (tty->flow.stopped) 3292 return 0; 3293 return 32768; /* No limit, really; we're not buffering */ 3294 } 3295 3296 /* 3297 * con_throttle and con_unthrottle are only used for 3298 * paste_selection(), which has to stuff in a large number of 3299 * characters... 3300 */ 3301 static void con_throttle(struct tty_struct *tty) 3302 { 3303 } 3304 3305 static void con_unthrottle(struct tty_struct *tty) 3306 { 3307 struct vc_data *vc = tty->driver_data; 3308 3309 wake_up_interruptible(&vc->paste_wait); 3310 } 3311 3312 /* 3313 * Turn the Scroll-Lock LED on when the tty is stopped 3314 */ 3315 static void con_stop(struct tty_struct *tty) 3316 { 3317 int console_num; 3318 if (!tty) 3319 return; 3320 console_num = tty->index; 3321 if (!vc_cons_allocated(console_num)) 3322 return; 3323 vt_kbd_con_stop(console_num); 3324 } 3325 3326 /* 3327 * Turn the Scroll-Lock LED off when the console is started 3328 */ 3329 static void con_start(struct tty_struct *tty) 3330 { 3331 int console_num; 3332 if (!tty) 3333 return; 3334 console_num = tty->index; 3335 if (!vc_cons_allocated(console_num)) 3336 return; 3337 vt_kbd_con_start(console_num); 3338 } 3339 3340 static void con_flush_chars(struct tty_struct *tty) 3341 { 3342 struct vc_data *vc; 3343 3344 if (in_interrupt()) /* from flush_to_ldisc */ 3345 return; 3346 3347 /* if we race with con_close(), vt may be null */ 3348 console_lock(); 3349 vc = tty->driver_data; 3350 if (vc) 3351 set_cursor(vc); 3352 console_unlock(); 3353 } 3354 3355 /* 3356 * Allocate the console screen memory. 3357 */ 3358 static int con_install(struct tty_driver *driver, struct tty_struct *tty) 3359 { 3360 unsigned int currcons = tty->index; 3361 struct vc_data *vc; 3362 int ret; 3363 3364 console_lock(); 3365 ret = vc_allocate(currcons); 3366 if (ret) 3367 goto unlock; 3368 3369 vc = vc_cons[currcons].d; 3370 3371 /* Still being freed */ 3372 if (vc->port.tty) { 3373 ret = -ERESTARTSYS; 3374 goto unlock; 3375 } 3376 3377 ret = tty_port_install(&vc->port, driver, tty); 3378 if (ret) 3379 goto unlock; 3380 3381 tty->driver_data = vc; 3382 vc->port.tty = tty; 3383 tty_port_get(&vc->port); 3384 3385 if (!tty->winsize.ws_row && !tty->winsize.ws_col) { 3386 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows; 3387 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols; 3388 } 3389 if (vc->vc_utf) 3390 tty->termios.c_iflag |= IUTF8; 3391 else 3392 tty->termios.c_iflag &= ~IUTF8; 3393 unlock: 3394 console_unlock(); 3395 return ret; 3396 } 3397 3398 static int con_open(struct tty_struct *tty, struct file *filp) 3399 { 3400 /* everything done in install */ 3401 return 0; 3402 } 3403 3404 3405 static void con_close(struct tty_struct *tty, struct file *filp) 3406 { 3407 /* Nothing to do - we defer to shutdown */ 3408 } 3409 3410 static void con_shutdown(struct tty_struct *tty) 3411 { 3412 struct vc_data *vc = tty->driver_data; 3413 BUG_ON(vc == NULL); 3414 console_lock(); 3415 vc->port.tty = NULL; 3416 console_unlock(); 3417 } 3418 3419 static void con_cleanup(struct tty_struct *tty) 3420 { 3421 struct vc_data *vc = tty->driver_data; 3422 3423 tty_port_put(&vc->port); 3424 } 3425 3426 static int default_color = 7; /* white */ 3427 static int default_italic_color = 2; // green (ASCII) 3428 static int default_underline_color = 3; // cyan (ASCII) 3429 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR); 3430 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR); 3431 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR); 3432 3433 static void vc_init(struct vc_data *vc, unsigned int rows, 3434 unsigned int cols, int do_clear) 3435 { 3436 int j, k ; 3437 3438 vc->vc_cols = cols; 3439 vc->vc_rows = rows; 3440 vc->vc_size_row = cols << 1; 3441 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row; 3442 3443 set_origin(vc); 3444 vc->vc_pos = vc->vc_origin; 3445 reset_vc(vc); 3446 for (j=k=0; j<16; j++) { 3447 vc->vc_palette[k++] = default_red[j] ; 3448 vc->vc_palette[k++] = default_grn[j] ; 3449 vc->vc_palette[k++] = default_blu[j] ; 3450 } 3451 vc->vc_def_color = default_color; 3452 vc->vc_ulcolor = default_underline_color; 3453 vc->vc_itcolor = default_italic_color; 3454 vc->vc_halfcolor = 0x08; /* grey */ 3455 init_waitqueue_head(&vc->paste_wait); 3456 reset_terminal(vc, do_clear); 3457 } 3458 3459 /* 3460 * This routine initializes console interrupts, and does nothing 3461 * else. If you want the screen to clear, call tty_write with 3462 * the appropriate escape-sequence. 3463 */ 3464 3465 static int __init con_init(void) 3466 { 3467 const char *display_desc = NULL; 3468 struct vc_data *vc; 3469 unsigned int currcons = 0, i; 3470 3471 console_lock(); 3472 3473 if (!conswitchp) 3474 conswitchp = &dummy_con; 3475 display_desc = conswitchp->con_startup(); 3476 if (!display_desc) { 3477 fg_console = 0; 3478 console_unlock(); 3479 return 0; 3480 } 3481 3482 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 3483 struct con_driver *con_driver = ®istered_con_driver[i]; 3484 3485 if (con_driver->con == NULL) { 3486 con_driver->con = conswitchp; 3487 con_driver->desc = display_desc; 3488 con_driver->flag = CON_DRIVER_FLAG_INIT; 3489 con_driver->first = 0; 3490 con_driver->last = MAX_NR_CONSOLES - 1; 3491 break; 3492 } 3493 } 3494 3495 for (i = 0; i < MAX_NR_CONSOLES; i++) 3496 con_driver_map[i] = conswitchp; 3497 3498 if (blankinterval) { 3499 blank_state = blank_normal_wait; 3500 mod_timer(&console_timer, jiffies + (blankinterval * HZ)); 3501 } 3502 3503 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) { 3504 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT); 3505 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK); 3506 tty_port_init(&vc->port); 3507 visual_init(vc, currcons, 1); 3508 /* Assuming vc->vc_{cols,rows,screenbuf_size} are sane here. */ 3509 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT); 3510 vc_init(vc, vc->vc_rows, vc->vc_cols, 3511 currcons || !vc->vc_sw->con_save_screen); 3512 } 3513 currcons = fg_console = 0; 3514 master_display_fg = vc = vc_cons[currcons].d; 3515 set_origin(vc); 3516 save_screen(vc); 3517 gotoxy(vc, vc->state.x, vc->state.y); 3518 csi_J(vc, 0); 3519 update_screen(vc); 3520 pr_info("Console: %s %s %dx%d\n", 3521 vc->vc_can_do_color ? "colour" : "mono", 3522 display_desc, vc->vc_cols, vc->vc_rows); 3523 printable = 1; 3524 3525 console_unlock(); 3526 3527 #ifdef CONFIG_VT_CONSOLE 3528 register_console(&vt_console_driver); 3529 #endif 3530 return 0; 3531 } 3532 console_initcall(con_init); 3533 3534 static const struct tty_operations con_ops = { 3535 .install = con_install, 3536 .open = con_open, 3537 .close = con_close, 3538 .write = con_write, 3539 .write_room = con_write_room, 3540 .put_char = con_put_char, 3541 .flush_chars = con_flush_chars, 3542 .ioctl = vt_ioctl, 3543 #ifdef CONFIG_COMPAT 3544 .compat_ioctl = vt_compat_ioctl, 3545 #endif 3546 .stop = con_stop, 3547 .start = con_start, 3548 .throttle = con_throttle, 3549 .unthrottle = con_unthrottle, 3550 .resize = vt_resize, 3551 .shutdown = con_shutdown, 3552 .cleanup = con_cleanup, 3553 }; 3554 3555 static struct cdev vc0_cdev; 3556 3557 static ssize_t show_tty_active(struct device *dev, 3558 struct device_attribute *attr, char *buf) 3559 { 3560 return sprintf(buf, "tty%d\n", fg_console + 1); 3561 } 3562 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL); 3563 3564 static struct attribute *vt_dev_attrs[] = { 3565 &dev_attr_active.attr, 3566 NULL 3567 }; 3568 3569 ATTRIBUTE_GROUPS(vt_dev); 3570 3571 int __init vty_init(const struct file_operations *console_fops) 3572 { 3573 cdev_init(&vc0_cdev, console_fops); 3574 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) || 3575 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0) 3576 panic("Couldn't register /dev/tty0 driver\n"); 3577 tty0dev = device_create_with_groups(tty_class, NULL, 3578 MKDEV(TTY_MAJOR, 0), NULL, 3579 vt_dev_groups, "tty0"); 3580 if (IS_ERR(tty0dev)) 3581 tty0dev = NULL; 3582 3583 vcs_init(); 3584 3585 console_driver = alloc_tty_driver(MAX_NR_CONSOLES); 3586 if (!console_driver) 3587 panic("Couldn't allocate console driver\n"); 3588 3589 console_driver->name = "tty"; 3590 console_driver->name_base = 1; 3591 console_driver->major = TTY_MAJOR; 3592 console_driver->minor_start = 1; 3593 console_driver->type = TTY_DRIVER_TYPE_CONSOLE; 3594 console_driver->init_termios = tty_std_termios; 3595 if (default_utf8) 3596 console_driver->init_termios.c_iflag |= IUTF8; 3597 console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS; 3598 tty_set_operations(console_driver, &con_ops); 3599 if (tty_register_driver(console_driver)) 3600 panic("Couldn't register console driver\n"); 3601 kbd_init(); 3602 console_map_init(); 3603 #ifdef CONFIG_MDA_CONSOLE 3604 mda_console_init(); 3605 #endif 3606 return 0; 3607 } 3608 3609 #ifndef VT_SINGLE_DRIVER 3610 3611 static struct class *vtconsole_class; 3612 3613 static int do_bind_con_driver(const struct consw *csw, int first, int last, 3614 int deflt) 3615 { 3616 struct module *owner = csw->owner; 3617 const char *desc = NULL; 3618 struct con_driver *con_driver; 3619 int i, j = -1, k = -1, retval = -ENODEV; 3620 3621 if (!try_module_get(owner)) 3622 return -ENODEV; 3623 3624 WARN_CONSOLE_UNLOCKED(); 3625 3626 /* check if driver is registered */ 3627 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 3628 con_driver = ®istered_con_driver[i]; 3629 3630 if (con_driver->con == csw) { 3631 desc = con_driver->desc; 3632 retval = 0; 3633 break; 3634 } 3635 } 3636 3637 if (retval) 3638 goto err; 3639 3640 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) { 3641 csw->con_startup(); 3642 con_driver->flag |= CON_DRIVER_FLAG_INIT; 3643 } 3644 3645 if (deflt) { 3646 if (conswitchp) 3647 module_put(conswitchp->owner); 3648 3649 __module_get(owner); 3650 conswitchp = csw; 3651 } 3652 3653 first = max(first, con_driver->first); 3654 last = min(last, con_driver->last); 3655 3656 for (i = first; i <= last; i++) { 3657 int old_was_color; 3658 struct vc_data *vc = vc_cons[i].d; 3659 3660 if (con_driver_map[i]) 3661 module_put(con_driver_map[i]->owner); 3662 __module_get(owner); 3663 con_driver_map[i] = csw; 3664 3665 if (!vc || !vc->vc_sw) 3666 continue; 3667 3668 j = i; 3669 3670 if (con_is_visible(vc)) { 3671 k = i; 3672 save_screen(vc); 3673 } 3674 3675 old_was_color = vc->vc_can_do_color; 3676 vc->vc_sw->con_deinit(vc); 3677 vc->vc_origin = (unsigned long)vc->vc_screenbuf; 3678 visual_init(vc, i, 0); 3679 set_origin(vc); 3680 update_attr(vc); 3681 3682 /* If the console changed between mono <-> color, then 3683 * the attributes in the screenbuf will be wrong. The 3684 * following resets all attributes to something sane. 3685 */ 3686 if (old_was_color != vc->vc_can_do_color) 3687 clear_buffer_attributes(vc); 3688 } 3689 3690 pr_info("Console: switching "); 3691 if (!deflt) 3692 pr_cont("consoles %d-%d ", first + 1, last + 1); 3693 if (j >= 0) { 3694 struct vc_data *vc = vc_cons[j].d; 3695 3696 pr_cont("to %s %s %dx%d\n", 3697 vc->vc_can_do_color ? "colour" : "mono", 3698 desc, vc->vc_cols, vc->vc_rows); 3699 3700 if (k >= 0) { 3701 vc = vc_cons[k].d; 3702 update_screen(vc); 3703 } 3704 } else { 3705 pr_cont("to %s\n", desc); 3706 } 3707 3708 retval = 0; 3709 err: 3710 module_put(owner); 3711 return retval; 3712 }; 3713 3714 3715 #ifdef CONFIG_VT_HW_CONSOLE_BINDING 3716 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt) 3717 { 3718 struct module *owner = csw->owner; 3719 const struct consw *defcsw = NULL; 3720 struct con_driver *con_driver = NULL, *con_back = NULL; 3721 int i, retval = -ENODEV; 3722 3723 if (!try_module_get(owner)) 3724 return -ENODEV; 3725 3726 WARN_CONSOLE_UNLOCKED(); 3727 3728 /* check if driver is registered and if it is unbindable */ 3729 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 3730 con_driver = ®istered_con_driver[i]; 3731 3732 if (con_driver->con == csw && 3733 con_driver->flag & CON_DRIVER_FLAG_MODULE) { 3734 retval = 0; 3735 break; 3736 } 3737 } 3738 3739 if (retval) 3740 goto err; 3741 3742 retval = -ENODEV; 3743 3744 /* check if backup driver exists */ 3745 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 3746 con_back = ®istered_con_driver[i]; 3747 3748 if (con_back->con && con_back->con != csw) { 3749 defcsw = con_back->con; 3750 retval = 0; 3751 break; 3752 } 3753 } 3754 3755 if (retval) 3756 goto err; 3757 3758 if (!con_is_bound(csw)) 3759 goto err; 3760 3761 first = max(first, con_driver->first); 3762 last = min(last, con_driver->last); 3763 3764 for (i = first; i <= last; i++) { 3765 if (con_driver_map[i] == csw) { 3766 module_put(csw->owner); 3767 con_driver_map[i] = NULL; 3768 } 3769 } 3770 3771 if (!con_is_bound(defcsw)) { 3772 const struct consw *defconsw = conswitchp; 3773 3774 defcsw->con_startup(); 3775 con_back->flag |= CON_DRIVER_FLAG_INIT; 3776 /* 3777 * vgacon may change the default driver to point 3778 * to dummycon, we restore it here... 3779 */ 3780 conswitchp = defconsw; 3781 } 3782 3783 if (!con_is_bound(csw)) 3784 con_driver->flag &= ~CON_DRIVER_FLAG_INIT; 3785 3786 /* ignore return value, binding should not fail */ 3787 do_bind_con_driver(defcsw, first, last, deflt); 3788 err: 3789 module_put(owner); 3790 return retval; 3791 3792 } 3793 EXPORT_SYMBOL_GPL(do_unbind_con_driver); 3794 3795 static int vt_bind(struct con_driver *con) 3796 { 3797 const struct consw *defcsw = NULL, *csw = NULL; 3798 int i, more = 1, first = -1, last = -1, deflt = 0; 3799 3800 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE)) 3801 goto err; 3802 3803 csw = con->con; 3804 3805 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 3806 struct con_driver *con = ®istered_con_driver[i]; 3807 3808 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) { 3809 defcsw = con->con; 3810 break; 3811 } 3812 } 3813 3814 if (!defcsw) 3815 goto err; 3816 3817 while (more) { 3818 more = 0; 3819 3820 for (i = con->first; i <= con->last; i++) { 3821 if (con_driver_map[i] == defcsw) { 3822 if (first == -1) 3823 first = i; 3824 last = i; 3825 more = 1; 3826 } else if (first != -1) 3827 break; 3828 } 3829 3830 if (first == 0 && last == MAX_NR_CONSOLES -1) 3831 deflt = 1; 3832 3833 if (first != -1) 3834 do_bind_con_driver(csw, first, last, deflt); 3835 3836 first = -1; 3837 last = -1; 3838 deflt = 0; 3839 } 3840 3841 err: 3842 return 0; 3843 } 3844 3845 static int vt_unbind(struct con_driver *con) 3846 { 3847 const struct consw *csw = NULL; 3848 int i, more = 1, first = -1, last = -1, deflt = 0; 3849 int ret; 3850 3851 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE)) 3852 goto err; 3853 3854 csw = con->con; 3855 3856 while (more) { 3857 more = 0; 3858 3859 for (i = con->first; i <= con->last; i++) { 3860 if (con_driver_map[i] == csw) { 3861 if (first == -1) 3862 first = i; 3863 last = i; 3864 more = 1; 3865 } else if (first != -1) 3866 break; 3867 } 3868 3869 if (first == 0 && last == MAX_NR_CONSOLES -1) 3870 deflt = 1; 3871 3872 if (first != -1) { 3873 ret = do_unbind_con_driver(csw, first, last, deflt); 3874 if (ret != 0) 3875 return ret; 3876 } 3877 3878 first = -1; 3879 last = -1; 3880 deflt = 0; 3881 } 3882 3883 err: 3884 return 0; 3885 } 3886 #else 3887 static inline int vt_bind(struct con_driver *con) 3888 { 3889 return 0; 3890 } 3891 static inline int vt_unbind(struct con_driver *con) 3892 { 3893 return 0; 3894 } 3895 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */ 3896 3897 static ssize_t store_bind(struct device *dev, struct device_attribute *attr, 3898 const char *buf, size_t count) 3899 { 3900 struct con_driver *con = dev_get_drvdata(dev); 3901 int bind = simple_strtoul(buf, NULL, 0); 3902 3903 console_lock(); 3904 3905 if (bind) 3906 vt_bind(con); 3907 else 3908 vt_unbind(con); 3909 3910 console_unlock(); 3911 3912 return count; 3913 } 3914 3915 static ssize_t show_bind(struct device *dev, struct device_attribute *attr, 3916 char *buf) 3917 { 3918 struct con_driver *con = dev_get_drvdata(dev); 3919 int bind; 3920 3921 console_lock(); 3922 bind = con_is_bound(con->con); 3923 console_unlock(); 3924 3925 return snprintf(buf, PAGE_SIZE, "%i\n", bind); 3926 } 3927 3928 static ssize_t show_name(struct device *dev, struct device_attribute *attr, 3929 char *buf) 3930 { 3931 struct con_driver *con = dev_get_drvdata(dev); 3932 3933 return snprintf(buf, PAGE_SIZE, "%s %s\n", 3934 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)", 3935 con->desc); 3936 3937 } 3938 3939 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind); 3940 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 3941 3942 static struct attribute *con_dev_attrs[] = { 3943 &dev_attr_bind.attr, 3944 &dev_attr_name.attr, 3945 NULL 3946 }; 3947 3948 ATTRIBUTE_GROUPS(con_dev); 3949 3950 static int vtconsole_init_device(struct con_driver *con) 3951 { 3952 con->flag |= CON_DRIVER_FLAG_ATTR; 3953 return 0; 3954 } 3955 3956 static void vtconsole_deinit_device(struct con_driver *con) 3957 { 3958 con->flag &= ~CON_DRIVER_FLAG_ATTR; 3959 } 3960 3961 /** 3962 * con_is_bound - checks if driver is bound to the console 3963 * @csw: console driver 3964 * 3965 * RETURNS: zero if unbound, nonzero if bound 3966 * 3967 * Drivers can call this and if zero, they should release 3968 * all resources allocated on con_startup() 3969 */ 3970 int con_is_bound(const struct consw *csw) 3971 { 3972 int i, bound = 0; 3973 3974 WARN_CONSOLE_UNLOCKED(); 3975 3976 for (i = 0; i < MAX_NR_CONSOLES; i++) { 3977 if (con_driver_map[i] == csw) { 3978 bound = 1; 3979 break; 3980 } 3981 } 3982 3983 return bound; 3984 } 3985 EXPORT_SYMBOL(con_is_bound); 3986 3987 /** 3988 * con_is_visible - checks whether the current console is visible 3989 * @vc: virtual console 3990 * 3991 * RETURNS: zero if not visible, nonzero if visible 3992 */ 3993 bool con_is_visible(const struct vc_data *vc) 3994 { 3995 WARN_CONSOLE_UNLOCKED(); 3996 3997 return *vc->vc_display_fg == vc; 3998 } 3999 EXPORT_SYMBOL(con_is_visible); 4000 4001 /** 4002 * con_debug_enter - prepare the console for the kernel debugger 4003 * @vc: virtual console 4004 * 4005 * Called when the console is taken over by the kernel debugger, this 4006 * function needs to save the current console state, then put the console 4007 * into a state suitable for the kernel debugger. 4008 * 4009 * RETURNS: 4010 * Zero on success, nonzero if a failure occurred when trying to prepare 4011 * the console for the debugger. 4012 */ 4013 int con_debug_enter(struct vc_data *vc) 4014 { 4015 int ret = 0; 4016 4017 saved_fg_console = fg_console; 4018 saved_last_console = last_console; 4019 saved_want_console = want_console; 4020 saved_vc_mode = vc->vc_mode; 4021 saved_console_blanked = console_blanked; 4022 vc->vc_mode = KD_TEXT; 4023 console_blanked = 0; 4024 if (vc->vc_sw->con_debug_enter) 4025 ret = vc->vc_sw->con_debug_enter(vc); 4026 #ifdef CONFIG_KGDB_KDB 4027 /* Set the initial LINES variable if it is not already set */ 4028 if (vc->vc_rows < 999) { 4029 int linecount; 4030 char lns[4]; 4031 const char *setargs[3] = { 4032 "set", 4033 "LINES", 4034 lns, 4035 }; 4036 if (kdbgetintenv(setargs[0], &linecount)) { 4037 snprintf(lns, 4, "%i", vc->vc_rows); 4038 kdb_set(2, setargs); 4039 } 4040 } 4041 if (vc->vc_cols < 999) { 4042 int colcount; 4043 char cols[4]; 4044 const char *setargs[3] = { 4045 "set", 4046 "COLUMNS", 4047 cols, 4048 }; 4049 if (kdbgetintenv(setargs[0], &colcount)) { 4050 snprintf(cols, 4, "%i", vc->vc_cols); 4051 kdb_set(2, setargs); 4052 } 4053 } 4054 #endif /* CONFIG_KGDB_KDB */ 4055 return ret; 4056 } 4057 EXPORT_SYMBOL_GPL(con_debug_enter); 4058 4059 /** 4060 * con_debug_leave - restore console state 4061 * 4062 * Restore the console state to what it was before the kernel debugger 4063 * was invoked. 4064 * 4065 * RETURNS: 4066 * Zero on success, nonzero if a failure occurred when trying to restore 4067 * the console. 4068 */ 4069 int con_debug_leave(void) 4070 { 4071 struct vc_data *vc; 4072 int ret = 0; 4073 4074 fg_console = saved_fg_console; 4075 last_console = saved_last_console; 4076 want_console = saved_want_console; 4077 console_blanked = saved_console_blanked; 4078 vc_cons[fg_console].d->vc_mode = saved_vc_mode; 4079 4080 vc = vc_cons[fg_console].d; 4081 if (vc->vc_sw->con_debug_leave) 4082 ret = vc->vc_sw->con_debug_leave(vc); 4083 return ret; 4084 } 4085 EXPORT_SYMBOL_GPL(con_debug_leave); 4086 4087 static int do_register_con_driver(const struct consw *csw, int first, int last) 4088 { 4089 struct module *owner = csw->owner; 4090 struct con_driver *con_driver; 4091 const char *desc; 4092 int i, retval; 4093 4094 WARN_CONSOLE_UNLOCKED(); 4095 4096 if (!try_module_get(owner)) 4097 return -ENODEV; 4098 4099 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 4100 con_driver = ®istered_con_driver[i]; 4101 4102 /* already registered */ 4103 if (con_driver->con == csw) { 4104 retval = -EBUSY; 4105 goto err; 4106 } 4107 } 4108 4109 desc = csw->con_startup(); 4110 if (!desc) { 4111 retval = -ENODEV; 4112 goto err; 4113 } 4114 4115 retval = -EINVAL; 4116 4117 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 4118 con_driver = ®istered_con_driver[i]; 4119 4120 if (con_driver->con == NULL && 4121 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) { 4122 con_driver->con = csw; 4123 con_driver->desc = desc; 4124 con_driver->node = i; 4125 con_driver->flag = CON_DRIVER_FLAG_MODULE | 4126 CON_DRIVER_FLAG_INIT; 4127 con_driver->first = first; 4128 con_driver->last = last; 4129 retval = 0; 4130 break; 4131 } 4132 } 4133 4134 if (retval) 4135 goto err; 4136 4137 con_driver->dev = 4138 device_create_with_groups(vtconsole_class, NULL, 4139 MKDEV(0, con_driver->node), 4140 con_driver, con_dev_groups, 4141 "vtcon%i", con_driver->node); 4142 if (IS_ERR(con_driver->dev)) { 4143 pr_warn("Unable to create device for %s; errno = %ld\n", 4144 con_driver->desc, PTR_ERR(con_driver->dev)); 4145 con_driver->dev = NULL; 4146 } else { 4147 vtconsole_init_device(con_driver); 4148 } 4149 4150 err: 4151 module_put(owner); 4152 return retval; 4153 } 4154 4155 4156 /** 4157 * do_unregister_con_driver - unregister console driver from console layer 4158 * @csw: console driver 4159 * 4160 * DESCRIPTION: All drivers that registers to the console layer must 4161 * call this function upon exit, or if the console driver is in a state 4162 * where it won't be able to handle console services, such as the 4163 * framebuffer console without loaded framebuffer drivers. 4164 * 4165 * The driver must unbind first prior to unregistration. 4166 */ 4167 int do_unregister_con_driver(const struct consw *csw) 4168 { 4169 int i; 4170 4171 /* cannot unregister a bound driver */ 4172 if (con_is_bound(csw)) 4173 return -EBUSY; 4174 4175 if (csw == conswitchp) 4176 return -EINVAL; 4177 4178 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 4179 struct con_driver *con_driver = ®istered_con_driver[i]; 4180 4181 if (con_driver->con == csw) { 4182 /* 4183 * Defer the removal of the sysfs entries since that 4184 * will acquire the kernfs s_active lock and we can't 4185 * acquire this lock while holding the console lock: 4186 * the unbind sysfs entry imposes already the opposite 4187 * order. Reset con already here to prevent any later 4188 * lookup to succeed and mark this slot as zombie, so 4189 * it won't get reused until we complete the removal 4190 * in the deferred work. 4191 */ 4192 con_driver->con = NULL; 4193 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE; 4194 schedule_work(&con_driver_unregister_work); 4195 4196 return 0; 4197 } 4198 } 4199 4200 return -ENODEV; 4201 } 4202 EXPORT_SYMBOL_GPL(do_unregister_con_driver); 4203 4204 static void con_driver_unregister_callback(struct work_struct *ignored) 4205 { 4206 int i; 4207 4208 console_lock(); 4209 4210 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 4211 struct con_driver *con_driver = ®istered_con_driver[i]; 4212 4213 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) 4214 continue; 4215 4216 console_unlock(); 4217 4218 vtconsole_deinit_device(con_driver); 4219 device_destroy(vtconsole_class, MKDEV(0, con_driver->node)); 4220 4221 console_lock(); 4222 4223 if (WARN_ON_ONCE(con_driver->con)) 4224 con_driver->con = NULL; 4225 con_driver->desc = NULL; 4226 con_driver->dev = NULL; 4227 con_driver->node = 0; 4228 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE); 4229 con_driver->flag = 0; 4230 con_driver->first = 0; 4231 con_driver->last = 0; 4232 } 4233 4234 console_unlock(); 4235 } 4236 4237 /* 4238 * If we support more console drivers, this function is used 4239 * when a driver wants to take over some existing consoles 4240 * and become default driver for newly opened ones. 4241 * 4242 * do_take_over_console is basically a register followed by bind 4243 */ 4244 int do_take_over_console(const struct consw *csw, int first, int last, int deflt) 4245 { 4246 int err; 4247 4248 err = do_register_con_driver(csw, first, last); 4249 /* 4250 * If we get an busy error we still want to bind the console driver 4251 * and return success, as we may have unbound the console driver 4252 * but not unregistered it. 4253 */ 4254 if (err == -EBUSY) 4255 err = 0; 4256 if (!err) 4257 do_bind_con_driver(csw, first, last, deflt); 4258 4259 return err; 4260 } 4261 EXPORT_SYMBOL_GPL(do_take_over_console); 4262 4263 4264 /* 4265 * give_up_console is a wrapper to unregister_con_driver. It will only 4266 * work if driver is fully unbound. 4267 */ 4268 void give_up_console(const struct consw *csw) 4269 { 4270 console_lock(); 4271 do_unregister_con_driver(csw); 4272 console_unlock(); 4273 } 4274 4275 static int __init vtconsole_class_init(void) 4276 { 4277 int i; 4278 4279 vtconsole_class = class_create(THIS_MODULE, "vtconsole"); 4280 if (IS_ERR(vtconsole_class)) { 4281 pr_warn("Unable to create vt console class; errno = %ld\n", 4282 PTR_ERR(vtconsole_class)); 4283 vtconsole_class = NULL; 4284 } 4285 4286 /* Add system drivers to sysfs */ 4287 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 4288 struct con_driver *con = ®istered_con_driver[i]; 4289 4290 if (con->con && !con->dev) { 4291 con->dev = 4292 device_create_with_groups(vtconsole_class, NULL, 4293 MKDEV(0, con->node), 4294 con, con_dev_groups, 4295 "vtcon%i", con->node); 4296 4297 if (IS_ERR(con->dev)) { 4298 pr_warn("Unable to create device for %s; errno = %ld\n", 4299 con->desc, PTR_ERR(con->dev)); 4300 con->dev = NULL; 4301 } else { 4302 vtconsole_init_device(con); 4303 } 4304 } 4305 } 4306 4307 return 0; 4308 } 4309 postcore_initcall(vtconsole_class_init); 4310 4311 #endif 4312 4313 /* 4314 * Screen blanking 4315 */ 4316 4317 static int set_vesa_blanking(char __user *p) 4318 { 4319 unsigned int mode; 4320 4321 if (get_user(mode, p + 1)) 4322 return -EFAULT; 4323 4324 vesa_blank_mode = (mode < 4) ? mode : 0; 4325 return 0; 4326 } 4327 4328 void do_blank_screen(int entering_gfx) 4329 { 4330 struct vc_data *vc = vc_cons[fg_console].d; 4331 int i; 4332 4333 might_sleep(); 4334 4335 WARN_CONSOLE_UNLOCKED(); 4336 4337 if (console_blanked) { 4338 if (blank_state == blank_vesa_wait) { 4339 blank_state = blank_off; 4340 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0); 4341 } 4342 return; 4343 } 4344 4345 /* entering graphics mode? */ 4346 if (entering_gfx) { 4347 hide_cursor(vc); 4348 save_screen(vc); 4349 vc->vc_sw->con_blank(vc, -1, 1); 4350 console_blanked = fg_console + 1; 4351 blank_state = blank_off; 4352 set_origin(vc); 4353 return; 4354 } 4355 4356 blank_state = blank_off; 4357 4358 /* don't blank graphics */ 4359 if (vc->vc_mode != KD_TEXT) { 4360 console_blanked = fg_console + 1; 4361 return; 4362 } 4363 4364 hide_cursor(vc); 4365 del_timer_sync(&console_timer); 4366 blank_timer_expired = 0; 4367 4368 save_screen(vc); 4369 /* In case we need to reset origin, blanking hook returns 1 */ 4370 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0); 4371 console_blanked = fg_console + 1; 4372 if (i) 4373 set_origin(vc); 4374 4375 if (console_blank_hook && console_blank_hook(1)) 4376 return; 4377 4378 if (vesa_off_interval && vesa_blank_mode) { 4379 blank_state = blank_vesa_wait; 4380 mod_timer(&console_timer, jiffies + vesa_off_interval); 4381 } 4382 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num); 4383 } 4384 EXPORT_SYMBOL(do_blank_screen); 4385 4386 /* 4387 * Called by timer as well as from vt_console_driver 4388 */ 4389 void do_unblank_screen(int leaving_gfx) 4390 { 4391 struct vc_data *vc; 4392 4393 /* This should now always be called from a "sane" (read: can schedule) 4394 * context for the sake of the low level drivers, except in the special 4395 * case of oops_in_progress 4396 */ 4397 if (!oops_in_progress) 4398 might_sleep(); 4399 4400 WARN_CONSOLE_UNLOCKED(); 4401 4402 ignore_poke = 0; 4403 if (!console_blanked) 4404 return; 4405 if (!vc_cons_allocated(fg_console)) { 4406 /* impossible */ 4407 pr_warn("unblank_screen: tty %d not allocated ??\n", 4408 fg_console + 1); 4409 return; 4410 } 4411 vc = vc_cons[fg_console].d; 4412 if (vc->vc_mode != KD_TEXT) 4413 return; /* but leave console_blanked != 0 */ 4414 4415 if (blankinterval) { 4416 mod_timer(&console_timer, jiffies + (blankinterval * HZ)); 4417 blank_state = blank_normal_wait; 4418 } 4419 4420 console_blanked = 0; 4421 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx)) 4422 /* Low-level driver cannot restore -> do it ourselves */ 4423 update_screen(vc); 4424 if (console_blank_hook) 4425 console_blank_hook(0); 4426 set_palette(vc); 4427 set_cursor(vc); 4428 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num); 4429 } 4430 EXPORT_SYMBOL(do_unblank_screen); 4431 4432 /* 4433 * This is called by the outside world to cause a forced unblank, mostly for 4434 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually 4435 * call it with 1 as an argument and so force a mode restore... that may kill 4436 * X or at least garbage the screen but would also make the Oops visible... 4437 */ 4438 void unblank_screen(void) 4439 { 4440 do_unblank_screen(0); 4441 } 4442 4443 /* 4444 * We defer the timer blanking to work queue so it can take the console mutex 4445 * (console operations can still happen at irq time, but only from printk which 4446 * has the console mutex. Not perfect yet, but better than no locking 4447 */ 4448 static void blank_screen_t(struct timer_list *unused) 4449 { 4450 blank_timer_expired = 1; 4451 schedule_work(&console_work); 4452 } 4453 4454 void poke_blanked_console(void) 4455 { 4456 WARN_CONSOLE_UNLOCKED(); 4457 4458 /* Add this so we quickly catch whoever might call us in a non 4459 * safe context. Nowadays, unblank_screen() isn't to be called in 4460 * atomic contexts and is allowed to schedule (with the special case 4461 * of oops_in_progress, but that isn't of any concern for this 4462 * function. --BenH. 4463 */ 4464 might_sleep(); 4465 4466 /* This isn't perfectly race free, but a race here would be mostly harmless, 4467 * at worst, we'll do a spurious blank and it's unlikely 4468 */ 4469 del_timer(&console_timer); 4470 blank_timer_expired = 0; 4471 4472 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS) 4473 return; 4474 if (console_blanked) 4475 unblank_screen(); 4476 else if (blankinterval) { 4477 mod_timer(&console_timer, jiffies + (blankinterval * HZ)); 4478 blank_state = blank_normal_wait; 4479 } 4480 } 4481 4482 /* 4483 * Palettes 4484 */ 4485 4486 static void set_palette(struct vc_data *vc) 4487 { 4488 WARN_CONSOLE_UNLOCKED(); 4489 4490 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette) 4491 vc->vc_sw->con_set_palette(vc, color_table); 4492 } 4493 4494 /* 4495 * Load palette into the DAC registers. arg points to a colour 4496 * map, 3 bytes per colour, 16 colours, range from 0 to 255. 4497 */ 4498 4499 int con_set_cmap(unsigned char __user *arg) 4500 { 4501 int i, j, k; 4502 unsigned char colormap[3*16]; 4503 4504 if (copy_from_user(colormap, arg, sizeof(colormap))) 4505 return -EFAULT; 4506 4507 console_lock(); 4508 for (i = k = 0; i < 16; i++) { 4509 default_red[i] = colormap[k++]; 4510 default_grn[i] = colormap[k++]; 4511 default_blu[i] = colormap[k++]; 4512 } 4513 for (i = 0; i < MAX_NR_CONSOLES; i++) { 4514 if (!vc_cons_allocated(i)) 4515 continue; 4516 for (j = k = 0; j < 16; j++) { 4517 vc_cons[i].d->vc_palette[k++] = default_red[j]; 4518 vc_cons[i].d->vc_palette[k++] = default_grn[j]; 4519 vc_cons[i].d->vc_palette[k++] = default_blu[j]; 4520 } 4521 set_palette(vc_cons[i].d); 4522 } 4523 console_unlock(); 4524 4525 return 0; 4526 } 4527 4528 int con_get_cmap(unsigned char __user *arg) 4529 { 4530 int i, k; 4531 unsigned char colormap[3*16]; 4532 4533 console_lock(); 4534 for (i = k = 0; i < 16; i++) { 4535 colormap[k++] = default_red[i]; 4536 colormap[k++] = default_grn[i]; 4537 colormap[k++] = default_blu[i]; 4538 } 4539 console_unlock(); 4540 4541 if (copy_to_user(arg, colormap, sizeof(colormap))) 4542 return -EFAULT; 4543 4544 return 0; 4545 } 4546 4547 void reset_palette(struct vc_data *vc) 4548 { 4549 int j, k; 4550 for (j=k=0; j<16; j++) { 4551 vc->vc_palette[k++] = default_red[j]; 4552 vc->vc_palette[k++] = default_grn[j]; 4553 vc->vc_palette[k++] = default_blu[j]; 4554 } 4555 set_palette(vc); 4556 } 4557 4558 /* 4559 * Font switching 4560 * 4561 * Currently we only support fonts up to 32 pixels wide, at a maximum height 4562 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints, 4563 * depending on width) reserved for each character which is kinda wasty, but 4564 * this is done in order to maintain compatibility with the EGA/VGA fonts. It 4565 * is up to the actual low-level console-driver convert data into its favorite 4566 * format (maybe we should add a `fontoffset' field to the `display' 4567 * structure so we won't have to convert the fontdata all the time. 4568 * /Jes 4569 */ 4570 4571 #define max_font_size 65536 4572 4573 static int con_font_get(struct vc_data *vc, struct console_font_op *op) 4574 { 4575 struct console_font font; 4576 int rc = -EINVAL; 4577 int c; 4578 4579 if (op->data) { 4580 font.data = kmalloc(max_font_size, GFP_KERNEL); 4581 if (!font.data) 4582 return -ENOMEM; 4583 } else 4584 font.data = NULL; 4585 4586 console_lock(); 4587 if (vc->vc_mode != KD_TEXT) 4588 rc = -EINVAL; 4589 else if (vc->vc_sw->con_font_get) 4590 rc = vc->vc_sw->con_font_get(vc, &font); 4591 else 4592 rc = -ENOSYS; 4593 console_unlock(); 4594 4595 if (rc) 4596 goto out; 4597 4598 c = (font.width+7)/8 * 32 * font.charcount; 4599 4600 if (op->data && font.charcount > op->charcount) 4601 rc = -ENOSPC; 4602 if (font.width > op->width || font.height > op->height) 4603 rc = -ENOSPC; 4604 if (rc) 4605 goto out; 4606 4607 op->height = font.height; 4608 op->width = font.width; 4609 op->charcount = font.charcount; 4610 4611 if (op->data && copy_to_user(op->data, font.data, c)) 4612 rc = -EFAULT; 4613 4614 out: 4615 kfree(font.data); 4616 return rc; 4617 } 4618 4619 static int con_font_set(struct vc_data *vc, struct console_font_op *op) 4620 { 4621 struct console_font font; 4622 int rc = -EINVAL; 4623 int size; 4624 4625 if (vc->vc_mode != KD_TEXT) 4626 return -EINVAL; 4627 if (!op->data) 4628 return -EINVAL; 4629 if (op->charcount > 512) 4630 return -EINVAL; 4631 if (op->width <= 0 || op->width > 32 || !op->height || op->height > 32) 4632 return -EINVAL; 4633 size = (op->width+7)/8 * 32 * op->charcount; 4634 if (size > max_font_size) 4635 return -ENOSPC; 4636 4637 font.data = memdup_user(op->data, size); 4638 if (IS_ERR(font.data)) 4639 return PTR_ERR(font.data); 4640 4641 font.charcount = op->charcount; 4642 font.width = op->width; 4643 font.height = op->height; 4644 4645 console_lock(); 4646 if (vc->vc_mode != KD_TEXT) 4647 rc = -EINVAL; 4648 else if (vc->vc_sw->con_font_set) 4649 rc = vc->vc_sw->con_font_set(vc, &font, op->flags); 4650 else 4651 rc = -ENOSYS; 4652 console_unlock(); 4653 kfree(font.data); 4654 return rc; 4655 } 4656 4657 static int con_font_default(struct vc_data *vc, struct console_font_op *op) 4658 { 4659 struct console_font font = {.width = op->width, .height = op->height}; 4660 char name[MAX_FONT_NAME]; 4661 char *s = name; 4662 int rc; 4663 4664 4665 if (!op->data) 4666 s = NULL; 4667 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0) 4668 return -EFAULT; 4669 else 4670 name[MAX_FONT_NAME - 1] = 0; 4671 4672 console_lock(); 4673 if (vc->vc_mode != KD_TEXT) { 4674 console_unlock(); 4675 return -EINVAL; 4676 } 4677 if (vc->vc_sw->con_font_default) 4678 rc = vc->vc_sw->con_font_default(vc, &font, s); 4679 else 4680 rc = -ENOSYS; 4681 console_unlock(); 4682 if (!rc) { 4683 op->width = font.width; 4684 op->height = font.height; 4685 } 4686 return rc; 4687 } 4688 4689 int con_font_op(struct vc_data *vc, struct console_font_op *op) 4690 { 4691 switch (op->op) { 4692 case KD_FONT_OP_SET: 4693 return con_font_set(vc, op); 4694 case KD_FONT_OP_GET: 4695 return con_font_get(vc, op); 4696 case KD_FONT_OP_SET_DEFAULT: 4697 return con_font_default(vc, op); 4698 case KD_FONT_OP_COPY: 4699 /* was buggy and never really used */ 4700 return -EINVAL; 4701 } 4702 return -ENOSYS; 4703 } 4704 4705 /* 4706 * Interface exported to selection and vcs. 4707 */ 4708 4709 /* used by selection */ 4710 u16 screen_glyph(const struct vc_data *vc, int offset) 4711 { 4712 u16 w = scr_readw(screenpos(vc, offset, true)); 4713 u16 c = w & 0xff; 4714 4715 if (w & vc->vc_hi_font_mask) 4716 c |= 0x100; 4717 return c; 4718 } 4719 EXPORT_SYMBOL_GPL(screen_glyph); 4720 4721 u32 screen_glyph_unicode(const struct vc_data *vc, int n) 4722 { 4723 struct uni_screen *uniscr = get_vc_uniscr(vc); 4724 4725 if (uniscr) 4726 return uniscr->lines[n / vc->vc_cols][n % vc->vc_cols]; 4727 return inverse_translate(vc, screen_glyph(vc, n * 2), 1); 4728 } 4729 EXPORT_SYMBOL_GPL(screen_glyph_unicode); 4730 4731 /* used by vcs - note the word offset */ 4732 unsigned short *screen_pos(const struct vc_data *vc, int w_offset, bool viewed) 4733 { 4734 return screenpos(vc, 2 * w_offset, viewed); 4735 } 4736 EXPORT_SYMBOL_GPL(screen_pos); 4737 4738 void getconsxy(const struct vc_data *vc, unsigned char xy[static 2]) 4739 { 4740 /* clamp values if they don't fit */ 4741 xy[0] = min(vc->state.x, 0xFFu); 4742 xy[1] = min(vc->state.y, 0xFFu); 4743 } 4744 4745 void putconsxy(struct vc_data *vc, unsigned char xy[static const 2]) 4746 { 4747 hide_cursor(vc); 4748 gotoxy(vc, xy[0], xy[1]); 4749 set_cursor(vc); 4750 } 4751 4752 u16 vcs_scr_readw(const struct vc_data *vc, const u16 *org) 4753 { 4754 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1) 4755 return softcursor_original; 4756 return scr_readw(org); 4757 } 4758 4759 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org) 4760 { 4761 scr_writew(val, org); 4762 if ((unsigned long)org == vc->vc_pos) { 4763 softcursor_original = -1; 4764 add_softcursor(vc); 4765 } 4766 } 4767 4768 void vcs_scr_updated(struct vc_data *vc) 4769 { 4770 notify_update(vc); 4771 } 4772 4773 void vc_scrolldelta_helper(struct vc_data *c, int lines, 4774 unsigned int rolled_over, void *base, unsigned int size) 4775 { 4776 unsigned long ubase = (unsigned long)base; 4777 ptrdiff_t scr_end = (void *)c->vc_scr_end - base; 4778 ptrdiff_t vorigin = (void *)c->vc_visible_origin - base; 4779 ptrdiff_t origin = (void *)c->vc_origin - base; 4780 int margin = c->vc_size_row * 4; 4781 int from, wrap, from_off, avail; 4782 4783 /* Turn scrollback off */ 4784 if (!lines) { 4785 c->vc_visible_origin = c->vc_origin; 4786 return; 4787 } 4788 4789 /* Do we have already enough to allow jumping from 0 to the end? */ 4790 if (rolled_over > scr_end + margin) { 4791 from = scr_end; 4792 wrap = rolled_over + c->vc_size_row; 4793 } else { 4794 from = 0; 4795 wrap = size; 4796 } 4797 4798 from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row; 4799 avail = (origin - from + wrap) % wrap; 4800 4801 /* Only a little piece would be left? Show all incl. the piece! */ 4802 if (avail < 2 * margin) 4803 margin = 0; 4804 if (from_off < margin) 4805 from_off = 0; 4806 if (from_off > avail - margin) 4807 from_off = avail; 4808 4809 c->vc_visible_origin = ubase + (from + from_off) % wrap; 4810 } 4811 EXPORT_SYMBOL_GPL(vc_scrolldelta_helper); 4812 4813 /* 4814 * Visible symbols for modules 4815 */ 4816 4817 EXPORT_SYMBOL(color_table); 4818 EXPORT_SYMBOL(default_red); 4819 EXPORT_SYMBOL(default_grn); 4820 EXPORT_SYMBOL(default_blu); 4821 EXPORT_SYMBOL(update_region); 4822 EXPORT_SYMBOL(redraw_screen); 4823 EXPORT_SYMBOL(vc_resize); 4824 EXPORT_SYMBOL(fg_console); 4825 EXPORT_SYMBOL(console_blank_hook); 4826 EXPORT_SYMBOL(console_blanked); 4827 EXPORT_SYMBOL(vc_cons); 4828 EXPORT_SYMBOL(global_cursor_default); 4829 #ifndef VT_SINGLE_DRIVER 4830 EXPORT_SYMBOL(give_up_console); 4831 #endif 4832