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 /* 1224 * This function is being called here to cover the case 1225 * where the userspace calls the FBIOPUT_VSCREENINFO twice, 1226 * passing the same fb_var_screeninfo containing the fields 1227 * yres/xres equal to a number non-multiple of vc_font.height 1228 * and yres_virtual/xres_virtual equal to number lesser than the 1229 * vc_font.height and yres/xres. 1230 * In the second call, the struct fb_var_screeninfo isn't 1231 * being modified by the underlying driver because of the 1232 * if above, and this causes the fbcon_display->vrows to become 1233 * negative and it eventually leads to out-of-bound 1234 * access by the imageblit function. 1235 * To give the correct values to the struct and to not have 1236 * to deal with possible errors from the code below, we call 1237 * the resize_screen here as well. 1238 */ 1239 return resize_screen(vc, new_cols, new_rows, user); 1240 } 1241 1242 if (new_screen_size > KMALLOC_MAX_SIZE || !new_screen_size) 1243 return -EINVAL; 1244 newscreen = kzalloc(new_screen_size, GFP_USER); 1245 if (!newscreen) 1246 return -ENOMEM; 1247 1248 if (get_vc_uniscr(vc)) { 1249 new_uniscr = vc_uniscr_alloc(new_cols, new_rows); 1250 if (!new_uniscr) { 1251 kfree(newscreen); 1252 return -ENOMEM; 1253 } 1254 } 1255 1256 if (vc_is_sel(vc)) 1257 clear_selection(); 1258 1259 old_rows = vc->vc_rows; 1260 old_row_size = vc->vc_size_row; 1261 1262 err = resize_screen(vc, new_cols, new_rows, user); 1263 if (err) { 1264 kfree(newscreen); 1265 vc_uniscr_free(new_uniscr); 1266 return err; 1267 } 1268 1269 vc->vc_rows = new_rows; 1270 vc->vc_cols = new_cols; 1271 vc->vc_size_row = new_row_size; 1272 vc->vc_screenbuf_size = new_screen_size; 1273 1274 rlth = min(old_row_size, new_row_size); 1275 rrem = new_row_size - rlth; 1276 old_origin = vc->vc_origin; 1277 new_origin = (long) newscreen; 1278 new_scr_end = new_origin + new_screen_size; 1279 1280 if (vc->state.y > new_rows) { 1281 if (old_rows - vc->state.y < new_rows) { 1282 /* 1283 * Cursor near the bottom, copy contents from the 1284 * bottom of buffer 1285 */ 1286 first_copied_row = (old_rows - new_rows); 1287 } else { 1288 /* 1289 * Cursor is in no man's land, copy 1/2 screenful 1290 * from the top and bottom of cursor position 1291 */ 1292 first_copied_row = (vc->state.y - new_rows/2); 1293 } 1294 old_origin += first_copied_row * old_row_size; 1295 } else 1296 first_copied_row = 0; 1297 end = old_origin + old_row_size * min(old_rows, new_rows); 1298 1299 vc_uniscr_copy_area(new_uniscr, new_cols, new_rows, 1300 get_vc_uniscr(vc), rlth/2, first_copied_row, 1301 min(old_rows, new_rows)); 1302 vc_uniscr_set(vc, new_uniscr); 1303 1304 update_attr(vc); 1305 1306 while (old_origin < end) { 1307 scr_memcpyw((unsigned short *) new_origin, 1308 (unsigned short *) old_origin, rlth); 1309 if (rrem) 1310 scr_memsetw((void *)(new_origin + rlth), 1311 vc->vc_video_erase_char, rrem); 1312 old_origin += old_row_size; 1313 new_origin += new_row_size; 1314 } 1315 if (new_scr_end > new_origin) 1316 scr_memsetw((void *)new_origin, vc->vc_video_erase_char, 1317 new_scr_end - new_origin); 1318 oldscreen = vc->vc_screenbuf; 1319 vc->vc_screenbuf = newscreen; 1320 vc->vc_screenbuf_size = new_screen_size; 1321 set_origin(vc); 1322 kfree(oldscreen); 1323 1324 /* do part of a reset_terminal() */ 1325 vc->vc_top = 0; 1326 vc->vc_bottom = vc->vc_rows; 1327 gotoxy(vc, vc->state.x, vc->state.y); 1328 save_cur(vc); 1329 1330 if (tty) { 1331 /* Rewrite the requested winsize data with the actual 1332 resulting sizes */ 1333 struct winsize ws; 1334 memset(&ws, 0, sizeof(ws)); 1335 ws.ws_row = vc->vc_rows; 1336 ws.ws_col = vc->vc_cols; 1337 ws.ws_ypixel = vc->vc_scan_lines; 1338 tty_do_resize(tty, &ws); 1339 } 1340 1341 if (con_is_visible(vc)) 1342 update_screen(vc); 1343 vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num); 1344 notify_update(vc); 1345 return err; 1346 } 1347 1348 /** 1349 * vc_resize - resize a VT 1350 * @vc: virtual console 1351 * @cols: columns 1352 * @rows: rows 1353 * 1354 * Resize a virtual console as seen from the console end of things. We 1355 * use the common vc_do_resize methods to update the structures. The 1356 * caller must hold the console sem to protect console internals and 1357 * vc->port.tty 1358 */ 1359 1360 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows) 1361 { 1362 return vc_do_resize(vc->port.tty, vc, cols, rows); 1363 } 1364 1365 /** 1366 * vt_resize - resize a VT 1367 * @tty: tty to resize 1368 * @ws: winsize attributes 1369 * 1370 * Resize a virtual terminal. This is called by the tty layer as we 1371 * register our own handler for resizing. The mutual helper does all 1372 * the actual work. 1373 * 1374 * Takes the console sem and the called methods then take the tty 1375 * termios_rwsem and the tty ctrl.lock in that order. 1376 */ 1377 static int vt_resize(struct tty_struct *tty, struct winsize *ws) 1378 { 1379 struct vc_data *vc = tty->driver_data; 1380 int ret; 1381 1382 console_lock(); 1383 ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row); 1384 console_unlock(); 1385 return ret; 1386 } 1387 1388 struct vc_data *vc_deallocate(unsigned int currcons) 1389 { 1390 struct vc_data *vc = NULL; 1391 1392 WARN_CONSOLE_UNLOCKED(); 1393 1394 if (vc_cons_allocated(currcons)) { 1395 struct vt_notifier_param param; 1396 1397 param.vc = vc = vc_cons[currcons].d; 1398 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, ¶m); 1399 vcs_remove_sysfs(currcons); 1400 visual_deinit(vc); 1401 con_free_unimap(vc); 1402 put_pid(vc->vt_pid); 1403 vc_uniscr_set(vc, NULL); 1404 kfree(vc->vc_screenbuf); 1405 vc_cons[currcons].d = NULL; 1406 } 1407 return vc; 1408 } 1409 1410 /* 1411 * VT102 emulator 1412 */ 1413 1414 enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt}; 1415 1416 #define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x)) 1417 #define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x)) 1418 #define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x)) 1419 1420 #define decarm VC_REPEAT 1421 #define decckm VC_CKMODE 1422 #define kbdapplic VC_APPLIC 1423 #define lnm VC_CRLF 1424 1425 const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7, 1426 8,12,10,14, 9,13,11,15 }; 1427 1428 /* the default colour table, for VGA+ colour systems */ 1429 unsigned char default_red[] = { 1430 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 1431 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff 1432 }; 1433 module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR); 1434 1435 unsigned char default_grn[] = { 1436 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa, 1437 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff 1438 }; 1439 module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR); 1440 1441 unsigned char default_blu[] = { 1442 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa, 1443 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff 1444 }; 1445 module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR); 1446 1447 /* 1448 * gotoxy() must verify all boundaries, because the arguments 1449 * might also be negative. If the given position is out of 1450 * bounds, the cursor is placed at the nearest margin. 1451 */ 1452 static void gotoxy(struct vc_data *vc, int new_x, int new_y) 1453 { 1454 int min_y, max_y; 1455 1456 if (new_x < 0) 1457 vc->state.x = 0; 1458 else { 1459 if (new_x >= vc->vc_cols) 1460 vc->state.x = vc->vc_cols - 1; 1461 else 1462 vc->state.x = new_x; 1463 } 1464 1465 if (vc->vc_decom) { 1466 min_y = vc->vc_top; 1467 max_y = vc->vc_bottom; 1468 } else { 1469 min_y = 0; 1470 max_y = vc->vc_rows; 1471 } 1472 if (new_y < min_y) 1473 vc->state.y = min_y; 1474 else if (new_y >= max_y) 1475 vc->state.y = max_y - 1; 1476 else 1477 vc->state.y = new_y; 1478 vc->vc_pos = vc->vc_origin + vc->state.y * vc->vc_size_row + 1479 (vc->state.x << 1); 1480 vc->vc_need_wrap = 0; 1481 } 1482 1483 /* for absolute user moves, when decom is set */ 1484 static void gotoxay(struct vc_data *vc, int new_x, int new_y) 1485 { 1486 gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y); 1487 } 1488 1489 void scrollback(struct vc_data *vc) 1490 { 1491 scrolldelta(-(vc->vc_rows / 2)); 1492 } 1493 1494 void scrollfront(struct vc_data *vc, int lines) 1495 { 1496 if (!lines) 1497 lines = vc->vc_rows / 2; 1498 scrolldelta(lines); 1499 } 1500 1501 static void lf(struct vc_data *vc) 1502 { 1503 /* don't scroll if above bottom of scrolling region, or 1504 * if below scrolling region 1505 */ 1506 if (vc->state.y + 1 == vc->vc_bottom) 1507 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1); 1508 else if (vc->state.y < vc->vc_rows - 1) { 1509 vc->state.y++; 1510 vc->vc_pos += vc->vc_size_row; 1511 } 1512 vc->vc_need_wrap = 0; 1513 notify_write(vc, '\n'); 1514 } 1515 1516 static void ri(struct vc_data *vc) 1517 { 1518 /* don't scroll if below top of scrolling region, or 1519 * if above scrolling region 1520 */ 1521 if (vc->state.y == vc->vc_top) 1522 con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1); 1523 else if (vc->state.y > 0) { 1524 vc->state.y--; 1525 vc->vc_pos -= vc->vc_size_row; 1526 } 1527 vc->vc_need_wrap = 0; 1528 } 1529 1530 static inline void cr(struct vc_data *vc) 1531 { 1532 vc->vc_pos -= vc->state.x << 1; 1533 vc->vc_need_wrap = vc->state.x = 0; 1534 notify_write(vc, '\r'); 1535 } 1536 1537 static inline void bs(struct vc_data *vc) 1538 { 1539 if (vc->state.x) { 1540 vc->vc_pos -= 2; 1541 vc->state.x--; 1542 vc->vc_need_wrap = 0; 1543 notify_write(vc, '\b'); 1544 } 1545 } 1546 1547 static inline void del(struct vc_data *vc) 1548 { 1549 /* ignored */ 1550 } 1551 1552 static void csi_J(struct vc_data *vc, int vpar) 1553 { 1554 unsigned int count; 1555 unsigned short * start; 1556 1557 switch (vpar) { 1558 case 0: /* erase from cursor to end of display */ 1559 vc_uniscr_clear_line(vc, vc->state.x, 1560 vc->vc_cols - vc->state.x); 1561 vc_uniscr_clear_lines(vc, vc->state.y + 1, 1562 vc->vc_rows - vc->state.y - 1); 1563 count = (vc->vc_scr_end - vc->vc_pos) >> 1; 1564 start = (unsigned short *)vc->vc_pos; 1565 break; 1566 case 1: /* erase from start to cursor */ 1567 vc_uniscr_clear_line(vc, 0, vc->state.x + 1); 1568 vc_uniscr_clear_lines(vc, 0, vc->state.y); 1569 count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1; 1570 start = (unsigned short *)vc->vc_origin; 1571 break; 1572 case 3: /* include scrollback */ 1573 flush_scrollback(vc); 1574 fallthrough; 1575 case 2: /* erase whole display */ 1576 vc_uniscr_clear_lines(vc, 0, vc->vc_rows); 1577 count = vc->vc_cols * vc->vc_rows; 1578 start = (unsigned short *)vc->vc_origin; 1579 break; 1580 default: 1581 return; 1582 } 1583 scr_memsetw(start, vc->vc_video_erase_char, 2 * count); 1584 if (con_should_update(vc)) 1585 do_update_region(vc, (unsigned long) start, count); 1586 vc->vc_need_wrap = 0; 1587 } 1588 1589 static void csi_K(struct vc_data *vc, int vpar) 1590 { 1591 unsigned int count; 1592 unsigned short *start = (unsigned short *)vc->vc_pos; 1593 int offset; 1594 1595 switch (vpar) { 1596 case 0: /* erase from cursor to end of line */ 1597 offset = 0; 1598 count = vc->vc_cols - vc->state.x; 1599 break; 1600 case 1: /* erase from start of line to cursor */ 1601 offset = -vc->state.x; 1602 count = vc->state.x + 1; 1603 break; 1604 case 2: /* erase whole line */ 1605 offset = -vc->state.x; 1606 count = vc->vc_cols; 1607 break; 1608 default: 1609 return; 1610 } 1611 vc_uniscr_clear_line(vc, vc->state.x + offset, count); 1612 scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count); 1613 vc->vc_need_wrap = 0; 1614 if (con_should_update(vc)) 1615 do_update_region(vc, (unsigned long)(start + offset), count); 1616 } 1617 1618 /* erase the following vpar positions */ 1619 static void csi_X(struct vc_data *vc, unsigned int vpar) 1620 { /* not vt100? */ 1621 unsigned int count; 1622 1623 if (!vpar) 1624 vpar++; 1625 1626 count = min(vpar, vc->vc_cols - vc->state.x); 1627 1628 vc_uniscr_clear_line(vc, vc->state.x, count); 1629 scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count); 1630 if (con_should_update(vc)) 1631 vc->vc_sw->con_clear(vc, vc->state.y, vc->state.x, 1, count); 1632 vc->vc_need_wrap = 0; 1633 } 1634 1635 static void default_attr(struct vc_data *vc) 1636 { 1637 vc->state.intensity = VCI_NORMAL; 1638 vc->state.italic = false; 1639 vc->state.underline = false; 1640 vc->state.reverse = false; 1641 vc->state.blink = false; 1642 vc->state.color = vc->vc_def_color; 1643 } 1644 1645 struct rgb { u8 r; u8 g; u8 b; }; 1646 1647 static void rgb_from_256(int i, struct rgb *c) 1648 { 1649 if (i < 8) { /* Standard colours. */ 1650 c->r = i&1 ? 0xaa : 0x00; 1651 c->g = i&2 ? 0xaa : 0x00; 1652 c->b = i&4 ? 0xaa : 0x00; 1653 } else if (i < 16) { 1654 c->r = i&1 ? 0xff : 0x55; 1655 c->g = i&2 ? 0xff : 0x55; 1656 c->b = i&4 ? 0xff : 0x55; 1657 } else if (i < 232) { /* 6x6x6 colour cube. */ 1658 c->r = (i - 16) / 36 * 85 / 2; 1659 c->g = (i - 16) / 6 % 6 * 85 / 2; 1660 c->b = (i - 16) % 6 * 85 / 2; 1661 } else /* Grayscale ramp. */ 1662 c->r = c->g = c->b = i * 10 - 2312; 1663 } 1664 1665 static void rgb_foreground(struct vc_data *vc, const struct rgb *c) 1666 { 1667 u8 hue = 0, max = max3(c->r, c->g, c->b); 1668 1669 if (c->r > max / 2) 1670 hue |= 4; 1671 if (c->g > max / 2) 1672 hue |= 2; 1673 if (c->b > max / 2) 1674 hue |= 1; 1675 1676 if (hue == 7 && max <= 0x55) { 1677 hue = 0; 1678 vc->state.intensity = VCI_BOLD; 1679 } else if (max > 0xaa) 1680 vc->state.intensity = VCI_BOLD; 1681 else 1682 vc->state.intensity = VCI_NORMAL; 1683 1684 vc->state.color = (vc->state.color & 0xf0) | hue; 1685 } 1686 1687 static void rgb_background(struct vc_data *vc, const struct rgb *c) 1688 { 1689 /* For backgrounds, err on the dark side. */ 1690 vc->state.color = (vc->state.color & 0x0f) 1691 | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3; 1692 } 1693 1694 /* 1695 * ITU T.416 Higher colour modes. They break the usual properties of SGR codes 1696 * and thus need to be detected and ignored by hand. That standard also 1697 * wants : rather than ; as separators but sequences containing : are currently 1698 * completely ignored by the parser. 1699 * 1700 * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in 1701 * supporting them. 1702 */ 1703 static int vc_t416_color(struct vc_data *vc, int i, 1704 void(*set_color)(struct vc_data *vc, const struct rgb *c)) 1705 { 1706 struct rgb c; 1707 1708 i++; 1709 if (i > vc->vc_npar) 1710 return i; 1711 1712 if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) { 1713 /* 256 colours */ 1714 i++; 1715 rgb_from_256(vc->vc_par[i], &c); 1716 } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) { 1717 /* 24 bit */ 1718 c.r = vc->vc_par[i + 1]; 1719 c.g = vc->vc_par[i + 2]; 1720 c.b = vc->vc_par[i + 3]; 1721 i += 3; 1722 } else 1723 return i; 1724 1725 set_color(vc, &c); 1726 1727 return i; 1728 } 1729 1730 /* console_lock is held */ 1731 static void csi_m(struct vc_data *vc) 1732 { 1733 int i; 1734 1735 for (i = 0; i <= vc->vc_npar; i++) 1736 switch (vc->vc_par[i]) { 1737 case 0: /* all attributes off */ 1738 default_attr(vc); 1739 break; 1740 case 1: 1741 vc->state.intensity = VCI_BOLD; 1742 break; 1743 case 2: 1744 vc->state.intensity = VCI_HALF_BRIGHT; 1745 break; 1746 case 3: 1747 vc->state.italic = true; 1748 break; 1749 case 21: 1750 /* 1751 * No console drivers support double underline, so 1752 * convert it to a single underline. 1753 */ 1754 case 4: 1755 vc->state.underline = true; 1756 break; 1757 case 5: 1758 vc->state.blink = true; 1759 break; 1760 case 7: 1761 vc->state.reverse = true; 1762 break; 1763 case 10: /* ANSI X3.64-1979 (SCO-ish?) 1764 * Select primary font, don't display control chars if 1765 * defined, don't set bit 8 on output. 1766 */ 1767 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset], vc); 1768 vc->vc_disp_ctrl = 0; 1769 vc->vc_toggle_meta = 0; 1770 break; 1771 case 11: /* ANSI X3.64-1979 (SCO-ish?) 1772 * Select first alternate font, lets chars < 32 be 1773 * displayed as ROM chars. 1774 */ 1775 vc->vc_translate = set_translate(IBMPC_MAP, vc); 1776 vc->vc_disp_ctrl = 1; 1777 vc->vc_toggle_meta = 0; 1778 break; 1779 case 12: /* ANSI X3.64-1979 (SCO-ish?) 1780 * Select second alternate font, toggle high bit 1781 * before displaying as ROM char. 1782 */ 1783 vc->vc_translate = set_translate(IBMPC_MAP, vc); 1784 vc->vc_disp_ctrl = 1; 1785 vc->vc_toggle_meta = 1; 1786 break; 1787 case 22: 1788 vc->state.intensity = VCI_NORMAL; 1789 break; 1790 case 23: 1791 vc->state.italic = false; 1792 break; 1793 case 24: 1794 vc->state.underline = false; 1795 break; 1796 case 25: 1797 vc->state.blink = false; 1798 break; 1799 case 27: 1800 vc->state.reverse = false; 1801 break; 1802 case 38: 1803 i = vc_t416_color(vc, i, rgb_foreground); 1804 break; 1805 case 48: 1806 i = vc_t416_color(vc, i, rgb_background); 1807 break; 1808 case 39: 1809 vc->state.color = (vc->vc_def_color & 0x0f) | 1810 (vc->state.color & 0xf0); 1811 break; 1812 case 49: 1813 vc->state.color = (vc->vc_def_color & 0xf0) | 1814 (vc->state.color & 0x0f); 1815 break; 1816 default: 1817 if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) { 1818 if (vc->vc_par[i] < 100) 1819 vc->state.intensity = VCI_BOLD; 1820 vc->vc_par[i] -= 60; 1821 } 1822 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37) 1823 vc->state.color = color_table[vc->vc_par[i] - 30] 1824 | (vc->state.color & 0xf0); 1825 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47) 1826 vc->state.color = (color_table[vc->vc_par[i] - 40] << 4) 1827 | (vc->state.color & 0x0f); 1828 break; 1829 } 1830 update_attr(vc); 1831 } 1832 1833 static void respond_string(const char *p, size_t len, struct tty_port *port) 1834 { 1835 tty_insert_flip_string(port, p, len); 1836 tty_flip_buffer_push(port); 1837 } 1838 1839 static void cursor_report(struct vc_data *vc, struct tty_struct *tty) 1840 { 1841 char buf[40]; 1842 int len; 1843 1844 len = sprintf(buf, "\033[%d;%dR", vc->state.y + 1845 (vc->vc_decom ? vc->vc_top + 1 : 1), 1846 vc->state.x + 1); 1847 respond_string(buf, len, tty->port); 1848 } 1849 1850 static inline void status_report(struct tty_struct *tty) 1851 { 1852 static const char teminal_ok[] = "\033[0n"; 1853 1854 respond_string(teminal_ok, strlen(teminal_ok), tty->port); 1855 } 1856 1857 static inline void respond_ID(struct tty_struct *tty) 1858 { 1859 /* terminal answer to an ESC-Z or csi0c query. */ 1860 static const char vt102_id[] = "\033[?6c"; 1861 1862 respond_string(vt102_id, strlen(vt102_id), tty->port); 1863 } 1864 1865 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry) 1866 { 1867 char buf[8]; 1868 int len; 1869 1870 len = sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), 1871 (char)('!' + mrx), (char)('!' + mry)); 1872 respond_string(buf, len, tty->port); 1873 } 1874 1875 /* invoked via ioctl(TIOCLINUX) and through set_selection_user */ 1876 int mouse_reporting(void) 1877 { 1878 return vc_cons[fg_console].d->vc_report_mouse; 1879 } 1880 1881 /* console_lock is held */ 1882 static void set_mode(struct vc_data *vc, int on_off) 1883 { 1884 int i; 1885 1886 for (i = 0; i <= vc->vc_npar; i++) 1887 if (vc->vc_priv == EPdec) { 1888 switch(vc->vc_par[i]) { /* DEC private modes set/reset */ 1889 case 1: /* Cursor keys send ^[Ox/^[[x */ 1890 if (on_off) 1891 set_kbd(vc, decckm); 1892 else 1893 clr_kbd(vc, decckm); 1894 break; 1895 case 3: /* 80/132 mode switch unimplemented */ 1896 #if 0 1897 vc_resize(deccolm ? 132 : 80, vc->vc_rows); 1898 /* this alone does not suffice; some user mode 1899 utility has to change the hardware regs */ 1900 #endif 1901 break; 1902 case 5: /* Inverted screen on/off */ 1903 if (vc->vc_decscnm != on_off) { 1904 vc->vc_decscnm = on_off; 1905 invert_screen(vc, 0, 1906 vc->vc_screenbuf_size, 1907 false); 1908 update_attr(vc); 1909 } 1910 break; 1911 case 6: /* Origin relative/absolute */ 1912 vc->vc_decom = on_off; 1913 gotoxay(vc, 0, 0); 1914 break; 1915 case 7: /* Autowrap on/off */ 1916 vc->vc_decawm = on_off; 1917 break; 1918 case 8: /* Autorepeat on/off */ 1919 if (on_off) 1920 set_kbd(vc, decarm); 1921 else 1922 clr_kbd(vc, decarm); 1923 break; 1924 case 9: 1925 vc->vc_report_mouse = on_off ? 1 : 0; 1926 break; 1927 case 25: /* Cursor on/off */ 1928 vc->vc_deccm = on_off; 1929 break; 1930 case 1000: 1931 vc->vc_report_mouse = on_off ? 2 : 0; 1932 break; 1933 } 1934 } else { 1935 switch(vc->vc_par[i]) { /* ANSI modes set/reset */ 1936 case 3: /* Monitor (display ctrls) */ 1937 vc->vc_disp_ctrl = on_off; 1938 break; 1939 case 4: /* Insert Mode on/off */ 1940 vc->vc_decim = on_off; 1941 break; 1942 case 20: /* Lf, Enter == CrLf/Lf */ 1943 if (on_off) 1944 set_kbd(vc, lnm); 1945 else 1946 clr_kbd(vc, lnm); 1947 break; 1948 } 1949 } 1950 } 1951 1952 /* console_lock is held */ 1953 static void setterm_command(struct vc_data *vc) 1954 { 1955 switch (vc->vc_par[0]) { 1956 case 1: /* set color for underline mode */ 1957 if (vc->vc_can_do_color && vc->vc_par[1] < 16) { 1958 vc->vc_ulcolor = color_table[vc->vc_par[1]]; 1959 if (vc->state.underline) 1960 update_attr(vc); 1961 } 1962 break; 1963 case 2: /* set color for half intensity mode */ 1964 if (vc->vc_can_do_color && vc->vc_par[1] < 16) { 1965 vc->vc_halfcolor = color_table[vc->vc_par[1]]; 1966 if (vc->state.intensity == VCI_HALF_BRIGHT) 1967 update_attr(vc); 1968 } 1969 break; 1970 case 8: /* store colors as defaults */ 1971 vc->vc_def_color = vc->vc_attr; 1972 if (vc->vc_hi_font_mask == 0x100) 1973 vc->vc_def_color >>= 1; 1974 default_attr(vc); 1975 update_attr(vc); 1976 break; 1977 case 9: /* set blanking interval */ 1978 blankinterval = min(vc->vc_par[1], 60U) * 60; 1979 poke_blanked_console(); 1980 break; 1981 case 10: /* set bell frequency in Hz */ 1982 if (vc->vc_npar >= 1) 1983 vc->vc_bell_pitch = vc->vc_par[1]; 1984 else 1985 vc->vc_bell_pitch = DEFAULT_BELL_PITCH; 1986 break; 1987 case 11: /* set bell duration in msec */ 1988 if (vc->vc_npar >= 1) 1989 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ? 1990 msecs_to_jiffies(vc->vc_par[1]) : 0; 1991 else 1992 vc->vc_bell_duration = DEFAULT_BELL_DURATION; 1993 break; 1994 case 12: /* bring specified console to the front */ 1995 if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1)) 1996 set_console(vc->vc_par[1] - 1); 1997 break; 1998 case 13: /* unblank the screen */ 1999 poke_blanked_console(); 2000 break; 2001 case 14: /* set vesa powerdown interval */ 2002 vesa_off_interval = min(vc->vc_par[1], 60U) * 60 * HZ; 2003 break; 2004 case 15: /* activate the previous console */ 2005 set_console(last_console); 2006 break; 2007 case 16: /* set cursor blink duration in msec */ 2008 if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 && 2009 vc->vc_par[1] <= USHRT_MAX) 2010 vc->vc_cur_blink_ms = vc->vc_par[1]; 2011 else 2012 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS; 2013 break; 2014 } 2015 } 2016 2017 /* console_lock is held */ 2018 static void csi_at(struct vc_data *vc, unsigned int nr) 2019 { 2020 if (nr > vc->vc_cols - vc->state.x) 2021 nr = vc->vc_cols - vc->state.x; 2022 else if (!nr) 2023 nr = 1; 2024 insert_char(vc, nr); 2025 } 2026 2027 /* console_lock is held */ 2028 static void csi_L(struct vc_data *vc, unsigned int nr) 2029 { 2030 if (nr > vc->vc_rows - vc->state.y) 2031 nr = vc->vc_rows - vc->state.y; 2032 else if (!nr) 2033 nr = 1; 2034 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_DOWN, nr); 2035 vc->vc_need_wrap = 0; 2036 } 2037 2038 /* console_lock is held */ 2039 static void csi_P(struct vc_data *vc, unsigned int nr) 2040 { 2041 if (nr > vc->vc_cols - vc->state.x) 2042 nr = vc->vc_cols - vc->state.x; 2043 else if (!nr) 2044 nr = 1; 2045 delete_char(vc, nr); 2046 } 2047 2048 /* console_lock is held */ 2049 static void csi_M(struct vc_data *vc, unsigned int nr) 2050 { 2051 if (nr > vc->vc_rows - vc->state.y) 2052 nr = vc->vc_rows - vc->state.y; 2053 else if (!nr) 2054 nr=1; 2055 con_scroll(vc, vc->state.y, vc->vc_bottom, SM_UP, nr); 2056 vc->vc_need_wrap = 0; 2057 } 2058 2059 /* console_lock is held (except via vc_init->reset_terminal */ 2060 static void save_cur(struct vc_data *vc) 2061 { 2062 memcpy(&vc->saved_state, &vc->state, sizeof(vc->state)); 2063 } 2064 2065 /* console_lock is held */ 2066 static void restore_cur(struct vc_data *vc) 2067 { 2068 memcpy(&vc->state, &vc->saved_state, sizeof(vc->state)); 2069 2070 gotoxy(vc, vc->state.x, vc->state.y); 2071 vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset], 2072 vc); 2073 update_attr(vc); 2074 vc->vc_need_wrap = 0; 2075 } 2076 2077 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey, 2078 EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd, 2079 ESpalette, ESosc, ESapc, ESpm, ESdcs }; 2080 2081 /* console_lock is held (except via vc_init()) */ 2082 static void reset_terminal(struct vc_data *vc, int do_clear) 2083 { 2084 unsigned int i; 2085 2086 vc->vc_top = 0; 2087 vc->vc_bottom = vc->vc_rows; 2088 vc->vc_state = ESnormal; 2089 vc->vc_priv = EPecma; 2090 vc->vc_translate = set_translate(LAT1_MAP, vc); 2091 vc->state.Gx_charset[0] = LAT1_MAP; 2092 vc->state.Gx_charset[1] = GRAF_MAP; 2093 vc->state.charset = 0; 2094 vc->vc_need_wrap = 0; 2095 vc->vc_report_mouse = 0; 2096 vc->vc_utf = default_utf8; 2097 vc->vc_utf_count = 0; 2098 2099 vc->vc_disp_ctrl = 0; 2100 vc->vc_toggle_meta = 0; 2101 2102 vc->vc_decscnm = 0; 2103 vc->vc_decom = 0; 2104 vc->vc_decawm = 1; 2105 vc->vc_deccm = global_cursor_default; 2106 vc->vc_decim = 0; 2107 2108 vt_reset_keyboard(vc->vc_num); 2109 2110 vc->vc_cursor_type = cur_default; 2111 vc->vc_complement_mask = vc->vc_s_complement_mask; 2112 2113 default_attr(vc); 2114 update_attr(vc); 2115 2116 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT); 2117 for (i = 0; i < VC_TABSTOPS_COUNT; i += 8) 2118 set_bit(i, vc->vc_tab_stop); 2119 2120 vc->vc_bell_pitch = DEFAULT_BELL_PITCH; 2121 vc->vc_bell_duration = DEFAULT_BELL_DURATION; 2122 vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS; 2123 2124 gotoxy(vc, 0, 0); 2125 save_cur(vc); 2126 if (do_clear) 2127 csi_J(vc, 2); 2128 } 2129 2130 static void vc_setGx(struct vc_data *vc, unsigned int which, int c) 2131 { 2132 unsigned char *charset = &vc->state.Gx_charset[which]; 2133 2134 switch (c) { 2135 case '0': 2136 *charset = GRAF_MAP; 2137 break; 2138 case 'B': 2139 *charset = LAT1_MAP; 2140 break; 2141 case 'U': 2142 *charset = IBMPC_MAP; 2143 break; 2144 case 'K': 2145 *charset = USER_MAP; 2146 break; 2147 } 2148 2149 if (vc->state.charset == which) 2150 vc->vc_translate = set_translate(*charset, vc); 2151 } 2152 2153 /* is this state an ANSI control string? */ 2154 static bool ansi_control_string(unsigned int state) 2155 { 2156 if (state == ESosc || state == ESapc || state == ESpm || state == ESdcs) 2157 return true; 2158 return false; 2159 } 2160 2161 /* console_lock is held */ 2162 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c) 2163 { 2164 /* 2165 * Control characters can be used in the _middle_ 2166 * of an escape sequence, aside from ANSI control strings. 2167 */ 2168 if (ansi_control_string(vc->vc_state) && c >= 8 && c <= 13) 2169 return; 2170 switch (c) { 2171 case 0: 2172 return; 2173 case 7: 2174 if (ansi_control_string(vc->vc_state)) 2175 vc->vc_state = ESnormal; 2176 else if (vc->vc_bell_duration) 2177 kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration); 2178 return; 2179 case 8: 2180 bs(vc); 2181 return; 2182 case 9: 2183 vc->vc_pos -= (vc->state.x << 1); 2184 2185 vc->state.x = find_next_bit(vc->vc_tab_stop, 2186 min(vc->vc_cols - 1, VC_TABSTOPS_COUNT), 2187 vc->state.x + 1); 2188 if (vc->state.x >= VC_TABSTOPS_COUNT) 2189 vc->state.x = vc->vc_cols - 1; 2190 2191 vc->vc_pos += (vc->state.x << 1); 2192 notify_write(vc, '\t'); 2193 return; 2194 case 10: case 11: case 12: 2195 lf(vc); 2196 if (!is_kbd(vc, lnm)) 2197 return; 2198 fallthrough; 2199 case 13: 2200 cr(vc); 2201 return; 2202 case 14: 2203 vc->state.charset = 1; 2204 vc->vc_translate = set_translate(vc->state.Gx_charset[1], vc); 2205 vc->vc_disp_ctrl = 1; 2206 return; 2207 case 15: 2208 vc->state.charset = 0; 2209 vc->vc_translate = set_translate(vc->state.Gx_charset[0], vc); 2210 vc->vc_disp_ctrl = 0; 2211 return; 2212 case 24: case 26: 2213 vc->vc_state = ESnormal; 2214 return; 2215 case 27: 2216 vc->vc_state = ESesc; 2217 return; 2218 case 127: 2219 del(vc); 2220 return; 2221 case 128+27: 2222 vc->vc_state = ESsquare; 2223 return; 2224 } 2225 switch(vc->vc_state) { 2226 case ESesc: 2227 vc->vc_state = ESnormal; 2228 switch (c) { 2229 case '[': 2230 vc->vc_state = ESsquare; 2231 return; 2232 case ']': 2233 vc->vc_state = ESnonstd; 2234 return; 2235 case '_': 2236 vc->vc_state = ESapc; 2237 return; 2238 case '^': 2239 vc->vc_state = ESpm; 2240 return; 2241 case '%': 2242 vc->vc_state = ESpercent; 2243 return; 2244 case 'E': 2245 cr(vc); 2246 lf(vc); 2247 return; 2248 case 'M': 2249 ri(vc); 2250 return; 2251 case 'D': 2252 lf(vc); 2253 return; 2254 case 'H': 2255 if (vc->state.x < VC_TABSTOPS_COUNT) 2256 set_bit(vc->state.x, vc->vc_tab_stop); 2257 return; 2258 case 'P': 2259 vc->vc_state = ESdcs; 2260 return; 2261 case 'Z': 2262 respond_ID(tty); 2263 return; 2264 case '7': 2265 save_cur(vc); 2266 return; 2267 case '8': 2268 restore_cur(vc); 2269 return; 2270 case '(': 2271 vc->vc_state = ESsetG0; 2272 return; 2273 case ')': 2274 vc->vc_state = ESsetG1; 2275 return; 2276 case '#': 2277 vc->vc_state = EShash; 2278 return; 2279 case 'c': 2280 reset_terminal(vc, 1); 2281 return; 2282 case '>': /* Numeric keypad */ 2283 clr_kbd(vc, kbdapplic); 2284 return; 2285 case '=': /* Appl. keypad */ 2286 set_kbd(vc, kbdapplic); 2287 return; 2288 } 2289 return; 2290 case ESnonstd: 2291 if (c=='P') { /* palette escape sequence */ 2292 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++) 2293 vc->vc_par[vc->vc_npar] = 0; 2294 vc->vc_npar = 0; 2295 vc->vc_state = ESpalette; 2296 return; 2297 } else if (c=='R') { /* reset palette */ 2298 reset_palette(vc); 2299 vc->vc_state = ESnormal; 2300 } else if (c>='0' && c<='9') 2301 vc->vc_state = ESosc; 2302 else 2303 vc->vc_state = ESnormal; 2304 return; 2305 case ESpalette: 2306 if (isxdigit(c)) { 2307 vc->vc_par[vc->vc_npar++] = hex_to_bin(c); 2308 if (vc->vc_npar == 7) { 2309 int i = vc->vc_par[0] * 3, j = 1; 2310 vc->vc_palette[i] = 16 * vc->vc_par[j++]; 2311 vc->vc_palette[i++] += vc->vc_par[j++]; 2312 vc->vc_palette[i] = 16 * vc->vc_par[j++]; 2313 vc->vc_palette[i++] += vc->vc_par[j++]; 2314 vc->vc_palette[i] = 16 * vc->vc_par[j++]; 2315 vc->vc_palette[i] += vc->vc_par[j]; 2316 set_palette(vc); 2317 vc->vc_state = ESnormal; 2318 } 2319 } else 2320 vc->vc_state = ESnormal; 2321 return; 2322 case ESsquare: 2323 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++) 2324 vc->vc_par[vc->vc_npar] = 0; 2325 vc->vc_npar = 0; 2326 vc->vc_state = ESgetpars; 2327 if (c == '[') { /* Function key */ 2328 vc->vc_state=ESfunckey; 2329 return; 2330 } 2331 switch (c) { 2332 case '?': 2333 vc->vc_priv = EPdec; 2334 return; 2335 case '>': 2336 vc->vc_priv = EPgt; 2337 return; 2338 case '=': 2339 vc->vc_priv = EPeq; 2340 return; 2341 case '<': 2342 vc->vc_priv = EPlt; 2343 return; 2344 } 2345 vc->vc_priv = EPecma; 2346 fallthrough; 2347 case ESgetpars: 2348 if (c == ';' && vc->vc_npar < NPAR - 1) { 2349 vc->vc_npar++; 2350 return; 2351 } else if (c>='0' && c<='9') { 2352 vc->vc_par[vc->vc_npar] *= 10; 2353 vc->vc_par[vc->vc_npar] += c - '0'; 2354 return; 2355 } 2356 if (c >= 0x20 && c <= 0x3f) { /* 0x2x, 0x3a and 0x3c - 0x3f */ 2357 vc->vc_state = EScsiignore; 2358 return; 2359 } 2360 vc->vc_state = ESnormal; 2361 switch(c) { 2362 case 'h': 2363 if (vc->vc_priv <= EPdec) 2364 set_mode(vc, 1); 2365 return; 2366 case 'l': 2367 if (vc->vc_priv <= EPdec) 2368 set_mode(vc, 0); 2369 return; 2370 case 'c': 2371 if (vc->vc_priv == EPdec) { 2372 if (vc->vc_par[0]) 2373 vc->vc_cursor_type = 2374 CUR_MAKE(vc->vc_par[0], 2375 vc->vc_par[1], 2376 vc->vc_par[2]); 2377 else 2378 vc->vc_cursor_type = cur_default; 2379 return; 2380 } 2381 break; 2382 case 'm': 2383 if (vc->vc_priv == EPdec) { 2384 clear_selection(); 2385 if (vc->vc_par[0]) 2386 vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1]; 2387 else 2388 vc->vc_complement_mask = vc->vc_s_complement_mask; 2389 return; 2390 } 2391 break; 2392 case 'n': 2393 if (vc->vc_priv == EPecma) { 2394 if (vc->vc_par[0] == 5) 2395 status_report(tty); 2396 else if (vc->vc_par[0] == 6) 2397 cursor_report(vc, tty); 2398 } 2399 return; 2400 } 2401 if (vc->vc_priv != EPecma) { 2402 vc->vc_priv = EPecma; 2403 return; 2404 } 2405 switch(c) { 2406 case 'G': case '`': 2407 if (vc->vc_par[0]) 2408 vc->vc_par[0]--; 2409 gotoxy(vc, vc->vc_par[0], vc->state.y); 2410 return; 2411 case 'A': 2412 if (!vc->vc_par[0]) 2413 vc->vc_par[0]++; 2414 gotoxy(vc, vc->state.x, vc->state.y - vc->vc_par[0]); 2415 return; 2416 case 'B': case 'e': 2417 if (!vc->vc_par[0]) 2418 vc->vc_par[0]++; 2419 gotoxy(vc, vc->state.x, vc->state.y + vc->vc_par[0]); 2420 return; 2421 case 'C': case 'a': 2422 if (!vc->vc_par[0]) 2423 vc->vc_par[0]++; 2424 gotoxy(vc, vc->state.x + vc->vc_par[0], vc->state.y); 2425 return; 2426 case 'D': 2427 if (!vc->vc_par[0]) 2428 vc->vc_par[0]++; 2429 gotoxy(vc, vc->state.x - vc->vc_par[0], vc->state.y); 2430 return; 2431 case 'E': 2432 if (!vc->vc_par[0]) 2433 vc->vc_par[0]++; 2434 gotoxy(vc, 0, vc->state.y + vc->vc_par[0]); 2435 return; 2436 case 'F': 2437 if (!vc->vc_par[0]) 2438 vc->vc_par[0]++; 2439 gotoxy(vc, 0, vc->state.y - vc->vc_par[0]); 2440 return; 2441 case 'd': 2442 if (vc->vc_par[0]) 2443 vc->vc_par[0]--; 2444 gotoxay(vc, vc->state.x ,vc->vc_par[0]); 2445 return; 2446 case 'H': case 'f': 2447 if (vc->vc_par[0]) 2448 vc->vc_par[0]--; 2449 if (vc->vc_par[1]) 2450 vc->vc_par[1]--; 2451 gotoxay(vc, vc->vc_par[1], vc->vc_par[0]); 2452 return; 2453 case 'J': 2454 csi_J(vc, vc->vc_par[0]); 2455 return; 2456 case 'K': 2457 csi_K(vc, vc->vc_par[0]); 2458 return; 2459 case 'L': 2460 csi_L(vc, vc->vc_par[0]); 2461 return; 2462 case 'M': 2463 csi_M(vc, vc->vc_par[0]); 2464 return; 2465 case 'P': 2466 csi_P(vc, vc->vc_par[0]); 2467 return; 2468 case 'c': 2469 if (!vc->vc_par[0]) 2470 respond_ID(tty); 2471 return; 2472 case 'g': 2473 if (!vc->vc_par[0] && vc->state.x < VC_TABSTOPS_COUNT) 2474 set_bit(vc->state.x, vc->vc_tab_stop); 2475 else if (vc->vc_par[0] == 3) 2476 bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT); 2477 return; 2478 case 'm': 2479 csi_m(vc); 2480 return; 2481 case 'q': /* DECLL - but only 3 leds */ 2482 /* map 0,1,2,3 to 0,1,2,4 */ 2483 if (vc->vc_par[0] < 4) 2484 vt_set_led_state(vc->vc_num, 2485 (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4); 2486 return; 2487 case 'r': 2488 if (!vc->vc_par[0]) 2489 vc->vc_par[0]++; 2490 if (!vc->vc_par[1]) 2491 vc->vc_par[1] = vc->vc_rows; 2492 /* Minimum allowed region is 2 lines */ 2493 if (vc->vc_par[0] < vc->vc_par[1] && 2494 vc->vc_par[1] <= vc->vc_rows) { 2495 vc->vc_top = vc->vc_par[0] - 1; 2496 vc->vc_bottom = vc->vc_par[1]; 2497 gotoxay(vc, 0, 0); 2498 } 2499 return; 2500 case 's': 2501 save_cur(vc); 2502 return; 2503 case 'u': 2504 restore_cur(vc); 2505 return; 2506 case 'X': 2507 csi_X(vc, vc->vc_par[0]); 2508 return; 2509 case '@': 2510 csi_at(vc, vc->vc_par[0]); 2511 return; 2512 case ']': /* setterm functions */ 2513 setterm_command(vc); 2514 return; 2515 } 2516 return; 2517 case EScsiignore: 2518 if (c >= 20 && c <= 0x3f) 2519 return; 2520 vc->vc_state = ESnormal; 2521 return; 2522 case ESpercent: 2523 vc->vc_state = ESnormal; 2524 switch (c) { 2525 case '@': /* defined in ISO 2022 */ 2526 vc->vc_utf = 0; 2527 return; 2528 case 'G': /* prelim official escape code */ 2529 case '8': /* retained for compatibility */ 2530 vc->vc_utf = 1; 2531 return; 2532 } 2533 return; 2534 case ESfunckey: 2535 vc->vc_state = ESnormal; 2536 return; 2537 case EShash: 2538 vc->vc_state = ESnormal; 2539 if (c == '8') { 2540 /* DEC screen alignment test. kludge :-) */ 2541 vc->vc_video_erase_char = 2542 (vc->vc_video_erase_char & 0xff00) | 'E'; 2543 csi_J(vc, 2); 2544 vc->vc_video_erase_char = 2545 (vc->vc_video_erase_char & 0xff00) | ' '; 2546 do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2); 2547 } 2548 return; 2549 case ESsetG0: 2550 vc_setGx(vc, 0, c); 2551 vc->vc_state = ESnormal; 2552 return; 2553 case ESsetG1: 2554 vc_setGx(vc, 1, c); 2555 vc->vc_state = ESnormal; 2556 return; 2557 case ESapc: 2558 return; 2559 case ESosc: 2560 return; 2561 case ESpm: 2562 return; 2563 case ESdcs: 2564 return; 2565 default: 2566 vc->vc_state = ESnormal; 2567 } 2568 } 2569 2570 /* is_double_width() is based on the wcwidth() implementation by 2571 * Markus Kuhn -- 2007-05-26 (Unicode 5.0) 2572 * Latest version: https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c 2573 */ 2574 struct interval { 2575 uint32_t first; 2576 uint32_t last; 2577 }; 2578 2579 static int ucs_cmp(const void *key, const void *elt) 2580 { 2581 uint32_t ucs = *(uint32_t *)key; 2582 struct interval e = *(struct interval *) elt; 2583 2584 if (ucs > e.last) 2585 return 1; 2586 else if (ucs < e.first) 2587 return -1; 2588 return 0; 2589 } 2590 2591 static int is_double_width(uint32_t ucs) 2592 { 2593 static const struct interval double_width[] = { 2594 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E }, 2595 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF }, 2596 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 }, 2597 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD } 2598 }; 2599 if (ucs < double_width[0].first || 2600 ucs > double_width[ARRAY_SIZE(double_width) - 1].last) 2601 return 0; 2602 2603 return bsearch(&ucs, double_width, ARRAY_SIZE(double_width), 2604 sizeof(struct interval), ucs_cmp) != NULL; 2605 } 2606 2607 struct vc_draw_region { 2608 unsigned long from, to; 2609 int x; 2610 }; 2611 2612 static void con_flush(struct vc_data *vc, struct vc_draw_region *draw) 2613 { 2614 if (draw->x < 0) 2615 return; 2616 2617 vc->vc_sw->con_putcs(vc, (u16 *)draw->from, 2618 (u16 *)draw->to - (u16 *)draw->from, vc->state.y, 2619 draw->x); 2620 draw->x = -1; 2621 } 2622 2623 static inline int vc_translate_ascii(const struct vc_data *vc, int c) 2624 { 2625 if (IS_ENABLED(CONFIG_CONSOLE_TRANSLATIONS)) { 2626 if (vc->vc_toggle_meta) 2627 c |= 0x80; 2628 2629 return vc->vc_translate[c]; 2630 } 2631 2632 return c; 2633 } 2634 2635 2636 /** 2637 * vc_sanitize_unicode -- Replace invalid Unicode code points with U+FFFD 2638 * @c: the received character, or U+FFFD for invalid sequences. 2639 */ 2640 static inline int vc_sanitize_unicode(const int c) 2641 { 2642 if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff) 2643 return 0xfffd; 2644 2645 return c; 2646 } 2647 2648 /** 2649 * vc_translate_unicode -- Combine UTF-8 into Unicode in @vc_utf_char 2650 * @vc: virtual console 2651 * @c: character to translate 2652 * @rescan: we return true if we need more (continuation) data 2653 * 2654 * @vc_utf_char is the being-constructed unicode character. 2655 * @vc_utf_count is the number of continuation bytes still expected to arrive. 2656 * @vc_npar is the number of continuation bytes arrived so far. 2657 */ 2658 static int vc_translate_unicode(struct vc_data *vc, int c, bool *rescan) 2659 { 2660 static const u32 utf8_length_changes[] = { 2661 0x0000007f, 0x000007ff, 0x0000ffff, 2662 0x001fffff, 0x03ffffff, 0x7fffffff 2663 }; 2664 2665 /* Continuation byte received */ 2666 if ((c & 0xc0) == 0x80) { 2667 /* Unexpected continuation byte? */ 2668 if (!vc->vc_utf_count) 2669 return 0xfffd; 2670 2671 vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f); 2672 vc->vc_npar++; 2673 if (--vc->vc_utf_count) 2674 goto need_more_bytes; 2675 2676 /* Got a whole character */ 2677 c = vc->vc_utf_char; 2678 /* Reject overlong sequences */ 2679 if (c <= utf8_length_changes[vc->vc_npar - 1] || 2680 c > utf8_length_changes[vc->vc_npar]) 2681 return 0xfffd; 2682 2683 return vc_sanitize_unicode(c); 2684 } 2685 2686 /* Single ASCII byte or first byte of a sequence received */ 2687 if (vc->vc_utf_count) { 2688 /* Continuation byte expected */ 2689 *rescan = true; 2690 vc->vc_utf_count = 0; 2691 return 0xfffd; 2692 } 2693 2694 /* Nothing to do if an ASCII byte was received */ 2695 if (c <= 0x7f) 2696 return c; 2697 2698 /* First byte of a multibyte sequence received */ 2699 vc->vc_npar = 0; 2700 if ((c & 0xe0) == 0xc0) { 2701 vc->vc_utf_count = 1; 2702 vc->vc_utf_char = (c & 0x1f); 2703 } else if ((c & 0xf0) == 0xe0) { 2704 vc->vc_utf_count = 2; 2705 vc->vc_utf_char = (c & 0x0f); 2706 } else if ((c & 0xf8) == 0xf0) { 2707 vc->vc_utf_count = 3; 2708 vc->vc_utf_char = (c & 0x07); 2709 } else if ((c & 0xfc) == 0xf8) { 2710 vc->vc_utf_count = 4; 2711 vc->vc_utf_char = (c & 0x03); 2712 } else if ((c & 0xfe) == 0xfc) { 2713 vc->vc_utf_count = 5; 2714 vc->vc_utf_char = (c & 0x01); 2715 } else { 2716 /* 254 and 255 are invalid */ 2717 return 0xfffd; 2718 } 2719 2720 need_more_bytes: 2721 return -1; 2722 } 2723 2724 static int vc_translate(struct vc_data *vc, int *c, bool *rescan) 2725 { 2726 /* Do no translation at all in control states */ 2727 if (vc->vc_state != ESnormal) 2728 return *c; 2729 2730 if (vc->vc_utf && !vc->vc_disp_ctrl) 2731 return *c = vc_translate_unicode(vc, *c, rescan); 2732 2733 /* no utf or alternate charset mode */ 2734 return vc_translate_ascii(vc, *c); 2735 } 2736 2737 static inline unsigned char vc_invert_attr(const struct vc_data *vc) 2738 { 2739 if (!vc->vc_can_do_color) 2740 return vc->vc_attr ^ 0x08; 2741 2742 if (vc->vc_hi_font_mask == 0x100) 2743 return (vc->vc_attr & 0x11) | 2744 ((vc->vc_attr & 0xe0) >> 4) | 2745 ((vc->vc_attr & 0x0e) << 4); 2746 2747 return (vc->vc_attr & 0x88) | 2748 ((vc->vc_attr & 0x70) >> 4) | 2749 ((vc->vc_attr & 0x07) << 4); 2750 } 2751 2752 static bool vc_is_control(struct vc_data *vc, int tc, int c) 2753 { 2754 /* 2755 * A bitmap for codes <32. A bit of 1 indicates that the code 2756 * corresponding to that bit number invokes some special action (such 2757 * as cursor movement) and should not be displayed as a glyph unless 2758 * the disp_ctrl mode is explicitly enabled. 2759 */ 2760 static const u32 CTRL_ACTION = 0x0d00ff81; 2761 /* Cannot be overridden by disp_ctrl */ 2762 static const u32 CTRL_ALWAYS = 0x0800f501; 2763 2764 if (vc->vc_state != ESnormal) 2765 return true; 2766 2767 if (!tc) 2768 return true; 2769 2770 /* 2771 * If the original code was a control character we only allow a glyph 2772 * to be displayed if the code is not normally used (such as for cursor 2773 * movement) or if the disp_ctrl mode has been explicitly enabled. 2774 * Certain characters (as given by the CTRL_ALWAYS bitmap) are always 2775 * displayed as control characters, as the console would be pretty 2776 * useless without them; to display an arbitrary font position use the 2777 * direct-to-font zone in UTF-8 mode. 2778 */ 2779 if (c < 32) { 2780 if (vc->vc_disp_ctrl) 2781 return CTRL_ALWAYS & BIT(c); 2782 else 2783 return vc->vc_utf || (CTRL_ACTION & BIT(c)); 2784 } 2785 2786 if (c == 127 && !vc->vc_disp_ctrl) 2787 return true; 2788 2789 if (c == 128 + 27) 2790 return true; 2791 2792 return false; 2793 } 2794 2795 static int vc_con_write_normal(struct vc_data *vc, int tc, int c, 2796 struct vc_draw_region *draw) 2797 { 2798 int next_c; 2799 unsigned char vc_attr = vc->vc_attr; 2800 u16 himask = vc->vc_hi_font_mask, charmask = himask ? 0x1ff : 0xff; 2801 u8 width = 1; 2802 bool inverse = false; 2803 2804 if (vc->vc_utf && !vc->vc_disp_ctrl) { 2805 if (is_double_width(c)) 2806 width = 2; 2807 } 2808 2809 /* Now try to find out how to display it */ 2810 tc = conv_uni_to_pc(vc, tc); 2811 if (tc & ~charmask) { 2812 if (tc == -1 || tc == -2) 2813 return -1; /* nothing to display */ 2814 2815 /* Glyph not found */ 2816 if ((!vc->vc_utf || vc->vc_disp_ctrl || c < 128) && 2817 !(c & ~charmask)) { 2818 /* 2819 * In legacy mode use the glyph we get by a 1:1 2820 * mapping. 2821 * This would make absolutely no sense with Unicode in 2822 * mind, but do this for ASCII characters since a font 2823 * may lack Unicode mapping info and we don't want to 2824 * end up with having question marks only. 2825 */ 2826 tc = c; 2827 } else { 2828 /* 2829 * Display U+FFFD. If it's not found, display an inverse 2830 * question mark. 2831 */ 2832 tc = conv_uni_to_pc(vc, 0xfffd); 2833 if (tc < 0) { 2834 inverse = true; 2835 tc = conv_uni_to_pc(vc, '?'); 2836 if (tc < 0) 2837 tc = '?'; 2838 2839 vc_attr = vc_invert_attr(vc); 2840 con_flush(vc, draw); 2841 } 2842 } 2843 } 2844 2845 next_c = c; 2846 while (1) { 2847 if (vc->vc_need_wrap || vc->vc_decim) 2848 con_flush(vc, draw); 2849 if (vc->vc_need_wrap) { 2850 cr(vc); 2851 lf(vc); 2852 } 2853 if (vc->vc_decim) 2854 insert_char(vc, 1); 2855 vc_uniscr_putc(vc, next_c); 2856 2857 if (himask) 2858 tc = ((tc & 0x100) ? himask : 0) | 2859 (tc & 0xff); 2860 tc |= (vc_attr << 8) & ~himask; 2861 2862 scr_writew(tc, (u16 *)vc->vc_pos); 2863 2864 if (con_should_update(vc) && draw->x < 0) { 2865 draw->x = vc->state.x; 2866 draw->from = vc->vc_pos; 2867 } 2868 if (vc->state.x == vc->vc_cols - 1) { 2869 vc->vc_need_wrap = vc->vc_decawm; 2870 draw->to = vc->vc_pos + 2; 2871 } else { 2872 vc->state.x++; 2873 draw->to = (vc->vc_pos += 2); 2874 } 2875 2876 if (!--width) 2877 break; 2878 2879 /* A space is printed in the second column */ 2880 tc = conv_uni_to_pc(vc, ' '); 2881 if (tc < 0) 2882 tc = ' '; 2883 next_c = ' '; 2884 } 2885 notify_write(vc, c); 2886 2887 if (inverse) 2888 con_flush(vc, draw); 2889 2890 return 0; 2891 } 2892 2893 /* acquires console_lock */ 2894 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count) 2895 { 2896 struct vc_draw_region draw = { 2897 .x = -1, 2898 }; 2899 int c, tc, n = 0; 2900 unsigned int currcons; 2901 struct vc_data *vc; 2902 struct vt_notifier_param param; 2903 bool rescan; 2904 2905 if (in_interrupt()) 2906 return count; 2907 2908 console_lock(); 2909 vc = tty->driver_data; 2910 if (vc == NULL) { 2911 pr_err("vt: argh, driver_data is NULL !\n"); 2912 console_unlock(); 2913 return 0; 2914 } 2915 2916 currcons = vc->vc_num; 2917 if (!vc_cons_allocated(currcons)) { 2918 /* could this happen? */ 2919 pr_warn_once("con_write: tty %d not allocated\n", currcons+1); 2920 console_unlock(); 2921 return 0; 2922 } 2923 2924 2925 /* undraw cursor first */ 2926 if (con_is_fg(vc)) 2927 hide_cursor(vc); 2928 2929 param.vc = vc; 2930 2931 while (!tty->flow.stopped && count) { 2932 int orig = *buf; 2933 buf++; 2934 n++; 2935 count--; 2936 rescan_last_byte: 2937 c = orig; 2938 rescan = false; 2939 2940 tc = vc_translate(vc, &c, &rescan); 2941 if (tc == -1) 2942 continue; 2943 2944 param.c = tc; 2945 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE, 2946 ¶m) == NOTIFY_STOP) 2947 continue; 2948 2949 if (vc_is_control(vc, tc, c)) { 2950 con_flush(vc, &draw); 2951 do_con_trol(tty, vc, orig); 2952 continue; 2953 } 2954 2955 if (vc_con_write_normal(vc, tc, c, &draw) < 0) 2956 continue; 2957 2958 if (rescan) 2959 goto rescan_last_byte; 2960 } 2961 con_flush(vc, &draw); 2962 vc_uniscr_debug_check(vc); 2963 console_conditional_schedule(); 2964 notify_update(vc); 2965 console_unlock(); 2966 return n; 2967 } 2968 2969 /* 2970 * This is the console switching callback. 2971 * 2972 * Doing console switching in a process context allows 2973 * us to do the switches asynchronously (needed when we want 2974 * to switch due to a keyboard interrupt). Synchronization 2975 * with other console code and prevention of re-entrancy is 2976 * ensured with console_lock. 2977 */ 2978 static void console_callback(struct work_struct *ignored) 2979 { 2980 console_lock(); 2981 2982 if (want_console >= 0) { 2983 if (want_console != fg_console && 2984 vc_cons_allocated(want_console)) { 2985 hide_cursor(vc_cons[fg_console].d); 2986 change_console(vc_cons[want_console].d); 2987 /* we only changed when the console had already 2988 been allocated - a new console is not created 2989 in an interrupt routine */ 2990 } 2991 want_console = -1; 2992 } 2993 if (do_poke_blanked_console) { /* do not unblank for a LED change */ 2994 do_poke_blanked_console = 0; 2995 poke_blanked_console(); 2996 } 2997 if (scrollback_delta) { 2998 struct vc_data *vc = vc_cons[fg_console].d; 2999 clear_selection(); 3000 if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta) 3001 vc->vc_sw->con_scrolldelta(vc, scrollback_delta); 3002 scrollback_delta = 0; 3003 } 3004 if (blank_timer_expired) { 3005 do_blank_screen(0); 3006 blank_timer_expired = 0; 3007 } 3008 notify_update(vc_cons[fg_console].d); 3009 3010 console_unlock(); 3011 } 3012 3013 int set_console(int nr) 3014 { 3015 struct vc_data *vc = vc_cons[fg_console].d; 3016 3017 if (!vc_cons_allocated(nr) || vt_dont_switch || 3018 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) { 3019 3020 /* 3021 * Console switch will fail in console_callback() or 3022 * change_console() so there is no point scheduling 3023 * the callback 3024 * 3025 * Existing set_console() users don't check the return 3026 * value so this shouldn't break anything 3027 */ 3028 return -EINVAL; 3029 } 3030 3031 want_console = nr; 3032 schedule_console_callback(); 3033 3034 return 0; 3035 } 3036 3037 struct tty_driver *console_driver; 3038 3039 #ifdef CONFIG_VT_CONSOLE 3040 3041 /** 3042 * vt_kmsg_redirect() - Sets/gets the kernel message console 3043 * @new: The new virtual terminal number or -1 if the console should stay 3044 * unchanged 3045 * 3046 * By default, the kernel messages are always printed on the current virtual 3047 * console. However, the user may modify that default with the 3048 * TIOCL_SETKMSGREDIRECT ioctl call. 3049 * 3050 * This function sets the kernel message console to be @new. It returns the old 3051 * virtual console number. The virtual terminal number 0 (both as parameter and 3052 * return value) means no redirection (i.e. always printed on the currently 3053 * active console). 3054 * 3055 * The parameter -1 means that only the current console is returned, but the 3056 * value is not modified. You may use the macro vt_get_kmsg_redirect() in that 3057 * case to make the code more understandable. 3058 * 3059 * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores 3060 * the parameter and always returns 0. 3061 */ 3062 int vt_kmsg_redirect(int new) 3063 { 3064 static int kmsg_con; 3065 3066 if (new != -1) 3067 return xchg(&kmsg_con, new); 3068 else 3069 return kmsg_con; 3070 } 3071 3072 /* 3073 * Console on virtual terminal 3074 * 3075 * The console must be locked when we get here. 3076 */ 3077 3078 static void vt_console_print(struct console *co, const char *b, unsigned count) 3079 { 3080 struct vc_data *vc = vc_cons[fg_console].d; 3081 unsigned char c; 3082 static DEFINE_SPINLOCK(printing_lock); 3083 const ushort *start; 3084 ushort start_x, cnt; 3085 int kmsg_console; 3086 3087 /* console busy or not yet initialized */ 3088 if (!printable) 3089 return; 3090 if (!spin_trylock(&printing_lock)) 3091 return; 3092 3093 kmsg_console = vt_get_kmsg_redirect(); 3094 if (kmsg_console && vc_cons_allocated(kmsg_console - 1)) 3095 vc = vc_cons[kmsg_console - 1].d; 3096 3097 if (!vc_cons_allocated(fg_console)) { 3098 /* impossible */ 3099 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */ 3100 goto quit; 3101 } 3102 3103 if (vc->vc_mode != KD_TEXT) 3104 goto quit; 3105 3106 /* undraw cursor first */ 3107 if (con_is_fg(vc)) 3108 hide_cursor(vc); 3109 3110 start = (ushort *)vc->vc_pos; 3111 start_x = vc->state.x; 3112 cnt = 0; 3113 while (count--) { 3114 c = *b++; 3115 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) { 3116 if (cnt && con_is_visible(vc)) 3117 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x); 3118 cnt = 0; 3119 if (c == 8) { /* backspace */ 3120 bs(vc); 3121 start = (ushort *)vc->vc_pos; 3122 start_x = vc->state.x; 3123 continue; 3124 } 3125 if (c != 13) 3126 lf(vc); 3127 cr(vc); 3128 start = (ushort *)vc->vc_pos; 3129 start_x = vc->state.x; 3130 if (c == 10 || c == 13) 3131 continue; 3132 } 3133 vc_uniscr_putc(vc, c); 3134 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos); 3135 notify_write(vc, c); 3136 cnt++; 3137 if (vc->state.x == vc->vc_cols - 1) { 3138 vc->vc_need_wrap = 1; 3139 } else { 3140 vc->vc_pos += 2; 3141 vc->state.x++; 3142 } 3143 } 3144 if (cnt && con_is_visible(vc)) 3145 vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x); 3146 set_cursor(vc); 3147 notify_update(vc); 3148 3149 quit: 3150 spin_unlock(&printing_lock); 3151 } 3152 3153 static struct tty_driver *vt_console_device(struct console *c, int *index) 3154 { 3155 *index = c->index ? c->index-1 : fg_console; 3156 return console_driver; 3157 } 3158 3159 static struct console vt_console_driver = { 3160 .name = "tty", 3161 .write = vt_console_print, 3162 .device = vt_console_device, 3163 .unblank = unblank_screen, 3164 .flags = CON_PRINTBUFFER, 3165 .index = -1, 3166 }; 3167 #endif 3168 3169 /* 3170 * Handling of Linux-specific VC ioctls 3171 */ 3172 3173 /* 3174 * Generally a bit racy with respect to console_lock();. 3175 * 3176 * There are some functions which don't need it. 3177 * 3178 * There are some functions which can sleep for arbitrary periods 3179 * (paste_selection) but we don't need the lock there anyway. 3180 * 3181 * set_selection_user has locking, and definitely needs it 3182 */ 3183 3184 int tioclinux(struct tty_struct *tty, unsigned long arg) 3185 { 3186 char type, data; 3187 char __user *p = (char __user *)arg; 3188 int lines; 3189 int ret; 3190 3191 if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN)) 3192 return -EPERM; 3193 if (get_user(type, p)) 3194 return -EFAULT; 3195 ret = 0; 3196 3197 switch (type) 3198 { 3199 case TIOCL_SETSEL: 3200 ret = set_selection_user((struct tiocl_selection 3201 __user *)(p+1), tty); 3202 break; 3203 case TIOCL_PASTESEL: 3204 ret = paste_selection(tty); 3205 break; 3206 case TIOCL_UNBLANKSCREEN: 3207 console_lock(); 3208 unblank_screen(); 3209 console_unlock(); 3210 break; 3211 case TIOCL_SELLOADLUT: 3212 console_lock(); 3213 ret = sel_loadlut(p); 3214 console_unlock(); 3215 break; 3216 case TIOCL_GETSHIFTSTATE: 3217 3218 /* 3219 * Make it possible to react to Shift+Mousebutton. 3220 * Note that 'shift_state' is an undocumented 3221 * kernel-internal variable; programs not closely 3222 * related to the kernel should not use this. 3223 */ 3224 data = vt_get_shift_state(); 3225 ret = put_user(data, p); 3226 break; 3227 case TIOCL_GETMOUSEREPORTING: 3228 console_lock(); /* May be overkill */ 3229 data = mouse_reporting(); 3230 console_unlock(); 3231 ret = put_user(data, p); 3232 break; 3233 case TIOCL_SETVESABLANK: 3234 console_lock(); 3235 ret = set_vesa_blanking(p); 3236 console_unlock(); 3237 break; 3238 case TIOCL_GETKMSGREDIRECT: 3239 data = vt_get_kmsg_redirect(); 3240 ret = put_user(data, p); 3241 break; 3242 case TIOCL_SETKMSGREDIRECT: 3243 if (!capable(CAP_SYS_ADMIN)) { 3244 ret = -EPERM; 3245 } else { 3246 if (get_user(data, p+1)) 3247 ret = -EFAULT; 3248 else 3249 vt_kmsg_redirect(data); 3250 } 3251 break; 3252 case TIOCL_GETFGCONSOLE: 3253 /* No locking needed as this is a transiently 3254 correct return anyway if the caller hasn't 3255 disabled switching */ 3256 ret = fg_console; 3257 break; 3258 case TIOCL_SCROLLCONSOLE: 3259 if (get_user(lines, (s32 __user *)(p+4))) { 3260 ret = -EFAULT; 3261 } else { 3262 /* Need the console lock here. Note that lots 3263 of other calls need fixing before the lock 3264 is actually useful ! */ 3265 console_lock(); 3266 scrollfront(vc_cons[fg_console].d, lines); 3267 console_unlock(); 3268 ret = 0; 3269 } 3270 break; 3271 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */ 3272 console_lock(); 3273 ignore_poke = 1; 3274 do_blank_screen(0); 3275 console_unlock(); 3276 break; 3277 case TIOCL_BLANKEDSCREEN: 3278 ret = console_blanked; 3279 break; 3280 default: 3281 ret = -EINVAL; 3282 break; 3283 } 3284 return ret; 3285 } 3286 3287 /* 3288 * /dev/ttyN handling 3289 */ 3290 3291 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count) 3292 { 3293 int retval; 3294 3295 retval = do_con_write(tty, buf, count); 3296 con_flush_chars(tty); 3297 3298 return retval; 3299 } 3300 3301 static int con_put_char(struct tty_struct *tty, unsigned char ch) 3302 { 3303 return do_con_write(tty, &ch, 1); 3304 } 3305 3306 static unsigned int con_write_room(struct tty_struct *tty) 3307 { 3308 if (tty->flow.stopped) 3309 return 0; 3310 return 32768; /* No limit, really; we're not buffering */ 3311 } 3312 3313 /* 3314 * con_throttle and con_unthrottle are only used for 3315 * paste_selection(), which has to stuff in a large number of 3316 * characters... 3317 */ 3318 static void con_throttle(struct tty_struct *tty) 3319 { 3320 } 3321 3322 static void con_unthrottle(struct tty_struct *tty) 3323 { 3324 struct vc_data *vc = tty->driver_data; 3325 3326 wake_up_interruptible(&vc->paste_wait); 3327 } 3328 3329 /* 3330 * Turn the Scroll-Lock LED on when the tty is stopped 3331 */ 3332 static void con_stop(struct tty_struct *tty) 3333 { 3334 int console_num; 3335 if (!tty) 3336 return; 3337 console_num = tty->index; 3338 if (!vc_cons_allocated(console_num)) 3339 return; 3340 vt_kbd_con_stop(console_num); 3341 } 3342 3343 /* 3344 * Turn the Scroll-Lock LED off when the console is started 3345 */ 3346 static void con_start(struct tty_struct *tty) 3347 { 3348 int console_num; 3349 if (!tty) 3350 return; 3351 console_num = tty->index; 3352 if (!vc_cons_allocated(console_num)) 3353 return; 3354 vt_kbd_con_start(console_num); 3355 } 3356 3357 static void con_flush_chars(struct tty_struct *tty) 3358 { 3359 struct vc_data *vc; 3360 3361 if (in_interrupt()) /* from flush_to_ldisc */ 3362 return; 3363 3364 /* if we race with con_close(), vt may be null */ 3365 console_lock(); 3366 vc = tty->driver_data; 3367 if (vc) 3368 set_cursor(vc); 3369 console_unlock(); 3370 } 3371 3372 /* 3373 * Allocate the console screen memory. 3374 */ 3375 static int con_install(struct tty_driver *driver, struct tty_struct *tty) 3376 { 3377 unsigned int currcons = tty->index; 3378 struct vc_data *vc; 3379 int ret; 3380 3381 console_lock(); 3382 ret = vc_allocate(currcons); 3383 if (ret) 3384 goto unlock; 3385 3386 vc = vc_cons[currcons].d; 3387 3388 /* Still being freed */ 3389 if (vc->port.tty) { 3390 ret = -ERESTARTSYS; 3391 goto unlock; 3392 } 3393 3394 ret = tty_port_install(&vc->port, driver, tty); 3395 if (ret) 3396 goto unlock; 3397 3398 tty->driver_data = vc; 3399 vc->port.tty = tty; 3400 tty_port_get(&vc->port); 3401 3402 if (!tty->winsize.ws_row && !tty->winsize.ws_col) { 3403 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows; 3404 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols; 3405 } 3406 if (vc->vc_utf) 3407 tty->termios.c_iflag |= IUTF8; 3408 else 3409 tty->termios.c_iflag &= ~IUTF8; 3410 unlock: 3411 console_unlock(); 3412 return ret; 3413 } 3414 3415 static int con_open(struct tty_struct *tty, struct file *filp) 3416 { 3417 /* everything done in install */ 3418 return 0; 3419 } 3420 3421 3422 static void con_close(struct tty_struct *tty, struct file *filp) 3423 { 3424 /* Nothing to do - we defer to shutdown */ 3425 } 3426 3427 static void con_shutdown(struct tty_struct *tty) 3428 { 3429 struct vc_data *vc = tty->driver_data; 3430 BUG_ON(vc == NULL); 3431 console_lock(); 3432 vc->port.tty = NULL; 3433 console_unlock(); 3434 } 3435 3436 static void con_cleanup(struct tty_struct *tty) 3437 { 3438 struct vc_data *vc = tty->driver_data; 3439 3440 tty_port_put(&vc->port); 3441 } 3442 3443 static int default_color = 7; /* white */ 3444 static int default_italic_color = 2; // green (ASCII) 3445 static int default_underline_color = 3; // cyan (ASCII) 3446 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR); 3447 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR); 3448 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR); 3449 3450 static void vc_init(struct vc_data *vc, unsigned int rows, 3451 unsigned int cols, int do_clear) 3452 { 3453 int j, k ; 3454 3455 vc->vc_cols = cols; 3456 vc->vc_rows = rows; 3457 vc->vc_size_row = cols << 1; 3458 vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row; 3459 3460 set_origin(vc); 3461 vc->vc_pos = vc->vc_origin; 3462 reset_vc(vc); 3463 for (j=k=0; j<16; j++) { 3464 vc->vc_palette[k++] = default_red[j] ; 3465 vc->vc_palette[k++] = default_grn[j] ; 3466 vc->vc_palette[k++] = default_blu[j] ; 3467 } 3468 vc->vc_def_color = default_color; 3469 vc->vc_ulcolor = default_underline_color; 3470 vc->vc_itcolor = default_italic_color; 3471 vc->vc_halfcolor = 0x08; /* grey */ 3472 init_waitqueue_head(&vc->paste_wait); 3473 reset_terminal(vc, do_clear); 3474 } 3475 3476 /* 3477 * This routine initializes console interrupts, and does nothing 3478 * else. If you want the screen to clear, call tty_write with 3479 * the appropriate escape-sequence. 3480 */ 3481 3482 static int __init con_init(void) 3483 { 3484 const char *display_desc = NULL; 3485 struct vc_data *vc; 3486 unsigned int currcons = 0, i; 3487 3488 console_lock(); 3489 3490 if (!conswitchp) 3491 conswitchp = &dummy_con; 3492 display_desc = conswitchp->con_startup(); 3493 if (!display_desc) { 3494 fg_console = 0; 3495 console_unlock(); 3496 return 0; 3497 } 3498 3499 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 3500 struct con_driver *con_driver = ®istered_con_driver[i]; 3501 3502 if (con_driver->con == NULL) { 3503 con_driver->con = conswitchp; 3504 con_driver->desc = display_desc; 3505 con_driver->flag = CON_DRIVER_FLAG_INIT; 3506 con_driver->first = 0; 3507 con_driver->last = MAX_NR_CONSOLES - 1; 3508 break; 3509 } 3510 } 3511 3512 for (i = 0; i < MAX_NR_CONSOLES; i++) 3513 con_driver_map[i] = conswitchp; 3514 3515 if (blankinterval) { 3516 blank_state = blank_normal_wait; 3517 mod_timer(&console_timer, jiffies + (blankinterval * HZ)); 3518 } 3519 3520 for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) { 3521 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT); 3522 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK); 3523 tty_port_init(&vc->port); 3524 visual_init(vc, currcons, 1); 3525 /* Assuming vc->vc_{cols,rows,screenbuf_size} are sane here. */ 3526 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT); 3527 vc_init(vc, vc->vc_rows, vc->vc_cols, 3528 currcons || !vc->vc_sw->con_save_screen); 3529 } 3530 currcons = fg_console = 0; 3531 master_display_fg = vc = vc_cons[currcons].d; 3532 set_origin(vc); 3533 save_screen(vc); 3534 gotoxy(vc, vc->state.x, vc->state.y); 3535 csi_J(vc, 0); 3536 update_screen(vc); 3537 pr_info("Console: %s %s %dx%d\n", 3538 vc->vc_can_do_color ? "colour" : "mono", 3539 display_desc, vc->vc_cols, vc->vc_rows); 3540 printable = 1; 3541 3542 console_unlock(); 3543 3544 #ifdef CONFIG_VT_CONSOLE 3545 register_console(&vt_console_driver); 3546 #endif 3547 return 0; 3548 } 3549 console_initcall(con_init); 3550 3551 static const struct tty_operations con_ops = { 3552 .install = con_install, 3553 .open = con_open, 3554 .close = con_close, 3555 .write = con_write, 3556 .write_room = con_write_room, 3557 .put_char = con_put_char, 3558 .flush_chars = con_flush_chars, 3559 .ioctl = vt_ioctl, 3560 #ifdef CONFIG_COMPAT 3561 .compat_ioctl = vt_compat_ioctl, 3562 #endif 3563 .stop = con_stop, 3564 .start = con_start, 3565 .throttle = con_throttle, 3566 .unthrottle = con_unthrottle, 3567 .resize = vt_resize, 3568 .shutdown = con_shutdown, 3569 .cleanup = con_cleanup, 3570 }; 3571 3572 static struct cdev vc0_cdev; 3573 3574 static ssize_t show_tty_active(struct device *dev, 3575 struct device_attribute *attr, char *buf) 3576 { 3577 return sprintf(buf, "tty%d\n", fg_console + 1); 3578 } 3579 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL); 3580 3581 static struct attribute *vt_dev_attrs[] = { 3582 &dev_attr_active.attr, 3583 NULL 3584 }; 3585 3586 ATTRIBUTE_GROUPS(vt_dev); 3587 3588 int __init vty_init(const struct file_operations *console_fops) 3589 { 3590 cdev_init(&vc0_cdev, console_fops); 3591 if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) || 3592 register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0) 3593 panic("Couldn't register /dev/tty0 driver\n"); 3594 tty0dev = device_create_with_groups(tty_class, NULL, 3595 MKDEV(TTY_MAJOR, 0), NULL, 3596 vt_dev_groups, "tty0"); 3597 if (IS_ERR(tty0dev)) 3598 tty0dev = NULL; 3599 3600 vcs_init(); 3601 3602 console_driver = tty_alloc_driver(MAX_NR_CONSOLES, TTY_DRIVER_REAL_RAW | 3603 TTY_DRIVER_RESET_TERMIOS); 3604 if (IS_ERR(console_driver)) 3605 panic("Couldn't allocate console driver\n"); 3606 3607 console_driver->name = "tty"; 3608 console_driver->name_base = 1; 3609 console_driver->major = TTY_MAJOR; 3610 console_driver->minor_start = 1; 3611 console_driver->type = TTY_DRIVER_TYPE_CONSOLE; 3612 console_driver->init_termios = tty_std_termios; 3613 if (default_utf8) 3614 console_driver->init_termios.c_iflag |= IUTF8; 3615 tty_set_operations(console_driver, &con_ops); 3616 if (tty_register_driver(console_driver)) 3617 panic("Couldn't register console driver\n"); 3618 kbd_init(); 3619 console_map_init(); 3620 #ifdef CONFIG_MDA_CONSOLE 3621 mda_console_init(); 3622 #endif 3623 return 0; 3624 } 3625 3626 #ifndef VT_SINGLE_DRIVER 3627 3628 static struct class *vtconsole_class; 3629 3630 static int do_bind_con_driver(const struct consw *csw, int first, int last, 3631 int deflt) 3632 { 3633 struct module *owner = csw->owner; 3634 const char *desc = NULL; 3635 struct con_driver *con_driver; 3636 int i, j = -1, k = -1, retval = -ENODEV; 3637 3638 if (!try_module_get(owner)) 3639 return -ENODEV; 3640 3641 WARN_CONSOLE_UNLOCKED(); 3642 3643 /* check if driver is registered */ 3644 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 3645 con_driver = ®istered_con_driver[i]; 3646 3647 if (con_driver->con == csw) { 3648 desc = con_driver->desc; 3649 retval = 0; 3650 break; 3651 } 3652 } 3653 3654 if (retval) 3655 goto err; 3656 3657 if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) { 3658 csw->con_startup(); 3659 con_driver->flag |= CON_DRIVER_FLAG_INIT; 3660 } 3661 3662 if (deflt) { 3663 if (conswitchp) 3664 module_put(conswitchp->owner); 3665 3666 __module_get(owner); 3667 conswitchp = csw; 3668 } 3669 3670 first = max(first, con_driver->first); 3671 last = min(last, con_driver->last); 3672 3673 for (i = first; i <= last; i++) { 3674 int old_was_color; 3675 struct vc_data *vc = vc_cons[i].d; 3676 3677 if (con_driver_map[i]) 3678 module_put(con_driver_map[i]->owner); 3679 __module_get(owner); 3680 con_driver_map[i] = csw; 3681 3682 if (!vc || !vc->vc_sw) 3683 continue; 3684 3685 j = i; 3686 3687 if (con_is_visible(vc)) { 3688 k = i; 3689 save_screen(vc); 3690 } 3691 3692 old_was_color = vc->vc_can_do_color; 3693 vc->vc_sw->con_deinit(vc); 3694 vc->vc_origin = (unsigned long)vc->vc_screenbuf; 3695 visual_init(vc, i, 0); 3696 set_origin(vc); 3697 update_attr(vc); 3698 3699 /* If the console changed between mono <-> color, then 3700 * the attributes in the screenbuf will be wrong. The 3701 * following resets all attributes to something sane. 3702 */ 3703 if (old_was_color != vc->vc_can_do_color) 3704 clear_buffer_attributes(vc); 3705 } 3706 3707 pr_info("Console: switching "); 3708 if (!deflt) 3709 pr_cont("consoles %d-%d ", first + 1, last + 1); 3710 if (j >= 0) { 3711 struct vc_data *vc = vc_cons[j].d; 3712 3713 pr_cont("to %s %s %dx%d\n", 3714 vc->vc_can_do_color ? "colour" : "mono", 3715 desc, vc->vc_cols, vc->vc_rows); 3716 3717 if (k >= 0) { 3718 vc = vc_cons[k].d; 3719 update_screen(vc); 3720 } 3721 } else { 3722 pr_cont("to %s\n", desc); 3723 } 3724 3725 retval = 0; 3726 err: 3727 module_put(owner); 3728 return retval; 3729 }; 3730 3731 3732 #ifdef CONFIG_VT_HW_CONSOLE_BINDING 3733 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt) 3734 { 3735 struct module *owner = csw->owner; 3736 const struct consw *defcsw = NULL; 3737 struct con_driver *con_driver = NULL, *con_back = NULL; 3738 int i, retval = -ENODEV; 3739 3740 if (!try_module_get(owner)) 3741 return -ENODEV; 3742 3743 WARN_CONSOLE_UNLOCKED(); 3744 3745 /* check if driver is registered and if it is unbindable */ 3746 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 3747 con_driver = ®istered_con_driver[i]; 3748 3749 if (con_driver->con == csw && 3750 con_driver->flag & CON_DRIVER_FLAG_MODULE) { 3751 retval = 0; 3752 break; 3753 } 3754 } 3755 3756 if (retval) 3757 goto err; 3758 3759 retval = -ENODEV; 3760 3761 /* check if backup driver exists */ 3762 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 3763 con_back = ®istered_con_driver[i]; 3764 3765 if (con_back->con && con_back->con != csw) { 3766 defcsw = con_back->con; 3767 retval = 0; 3768 break; 3769 } 3770 } 3771 3772 if (retval) 3773 goto err; 3774 3775 if (!con_is_bound(csw)) 3776 goto err; 3777 3778 first = max(first, con_driver->first); 3779 last = min(last, con_driver->last); 3780 3781 for (i = first; i <= last; i++) { 3782 if (con_driver_map[i] == csw) { 3783 module_put(csw->owner); 3784 con_driver_map[i] = NULL; 3785 } 3786 } 3787 3788 if (!con_is_bound(defcsw)) { 3789 const struct consw *defconsw = conswitchp; 3790 3791 defcsw->con_startup(); 3792 con_back->flag |= CON_DRIVER_FLAG_INIT; 3793 /* 3794 * vgacon may change the default driver to point 3795 * to dummycon, we restore it here... 3796 */ 3797 conswitchp = defconsw; 3798 } 3799 3800 if (!con_is_bound(csw)) 3801 con_driver->flag &= ~CON_DRIVER_FLAG_INIT; 3802 3803 /* ignore return value, binding should not fail */ 3804 do_bind_con_driver(defcsw, first, last, deflt); 3805 err: 3806 module_put(owner); 3807 return retval; 3808 3809 } 3810 EXPORT_SYMBOL_GPL(do_unbind_con_driver); 3811 3812 static int vt_bind(struct con_driver *con) 3813 { 3814 const struct consw *defcsw = NULL, *csw = NULL; 3815 int i, more = 1, first = -1, last = -1, deflt = 0; 3816 3817 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE)) 3818 goto err; 3819 3820 csw = con->con; 3821 3822 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 3823 struct con_driver *con = ®istered_con_driver[i]; 3824 3825 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) { 3826 defcsw = con->con; 3827 break; 3828 } 3829 } 3830 3831 if (!defcsw) 3832 goto err; 3833 3834 while (more) { 3835 more = 0; 3836 3837 for (i = con->first; i <= con->last; i++) { 3838 if (con_driver_map[i] == defcsw) { 3839 if (first == -1) 3840 first = i; 3841 last = i; 3842 more = 1; 3843 } else if (first != -1) 3844 break; 3845 } 3846 3847 if (first == 0 && last == MAX_NR_CONSOLES -1) 3848 deflt = 1; 3849 3850 if (first != -1) 3851 do_bind_con_driver(csw, first, last, deflt); 3852 3853 first = -1; 3854 last = -1; 3855 deflt = 0; 3856 } 3857 3858 err: 3859 return 0; 3860 } 3861 3862 static int vt_unbind(struct con_driver *con) 3863 { 3864 const struct consw *csw = NULL; 3865 int i, more = 1, first = -1, last = -1, deflt = 0; 3866 int ret; 3867 3868 if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE)) 3869 goto err; 3870 3871 csw = con->con; 3872 3873 while (more) { 3874 more = 0; 3875 3876 for (i = con->first; i <= con->last; i++) { 3877 if (con_driver_map[i] == csw) { 3878 if (first == -1) 3879 first = i; 3880 last = i; 3881 more = 1; 3882 } else if (first != -1) 3883 break; 3884 } 3885 3886 if (first == 0 && last == MAX_NR_CONSOLES -1) 3887 deflt = 1; 3888 3889 if (first != -1) { 3890 ret = do_unbind_con_driver(csw, first, last, deflt); 3891 if (ret != 0) 3892 return ret; 3893 } 3894 3895 first = -1; 3896 last = -1; 3897 deflt = 0; 3898 } 3899 3900 err: 3901 return 0; 3902 } 3903 #else 3904 static inline int vt_bind(struct con_driver *con) 3905 { 3906 return 0; 3907 } 3908 static inline int vt_unbind(struct con_driver *con) 3909 { 3910 return 0; 3911 } 3912 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */ 3913 3914 static ssize_t store_bind(struct device *dev, struct device_attribute *attr, 3915 const char *buf, size_t count) 3916 { 3917 struct con_driver *con = dev_get_drvdata(dev); 3918 int bind = simple_strtoul(buf, NULL, 0); 3919 3920 console_lock(); 3921 3922 if (bind) 3923 vt_bind(con); 3924 else 3925 vt_unbind(con); 3926 3927 console_unlock(); 3928 3929 return count; 3930 } 3931 3932 static ssize_t show_bind(struct device *dev, struct device_attribute *attr, 3933 char *buf) 3934 { 3935 struct con_driver *con = dev_get_drvdata(dev); 3936 int bind; 3937 3938 console_lock(); 3939 bind = con_is_bound(con->con); 3940 console_unlock(); 3941 3942 return snprintf(buf, PAGE_SIZE, "%i\n", bind); 3943 } 3944 3945 static ssize_t show_name(struct device *dev, struct device_attribute *attr, 3946 char *buf) 3947 { 3948 struct con_driver *con = dev_get_drvdata(dev); 3949 3950 return snprintf(buf, PAGE_SIZE, "%s %s\n", 3951 (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)", 3952 con->desc); 3953 3954 } 3955 3956 static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind); 3957 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 3958 3959 static struct attribute *con_dev_attrs[] = { 3960 &dev_attr_bind.attr, 3961 &dev_attr_name.attr, 3962 NULL 3963 }; 3964 3965 ATTRIBUTE_GROUPS(con_dev); 3966 3967 static int vtconsole_init_device(struct con_driver *con) 3968 { 3969 con->flag |= CON_DRIVER_FLAG_ATTR; 3970 return 0; 3971 } 3972 3973 static void vtconsole_deinit_device(struct con_driver *con) 3974 { 3975 con->flag &= ~CON_DRIVER_FLAG_ATTR; 3976 } 3977 3978 /** 3979 * con_is_bound - checks if driver is bound to the console 3980 * @csw: console driver 3981 * 3982 * RETURNS: zero if unbound, nonzero if bound 3983 * 3984 * Drivers can call this and if zero, they should release 3985 * all resources allocated on con_startup() 3986 */ 3987 int con_is_bound(const struct consw *csw) 3988 { 3989 int i, bound = 0; 3990 3991 WARN_CONSOLE_UNLOCKED(); 3992 3993 for (i = 0; i < MAX_NR_CONSOLES; i++) { 3994 if (con_driver_map[i] == csw) { 3995 bound = 1; 3996 break; 3997 } 3998 } 3999 4000 return bound; 4001 } 4002 EXPORT_SYMBOL(con_is_bound); 4003 4004 /** 4005 * con_is_visible - checks whether the current console is visible 4006 * @vc: virtual console 4007 * 4008 * RETURNS: zero if not visible, nonzero if visible 4009 */ 4010 bool con_is_visible(const struct vc_data *vc) 4011 { 4012 WARN_CONSOLE_UNLOCKED(); 4013 4014 return *vc->vc_display_fg == vc; 4015 } 4016 EXPORT_SYMBOL(con_is_visible); 4017 4018 /** 4019 * con_debug_enter - prepare the console for the kernel debugger 4020 * @vc: virtual console 4021 * 4022 * Called when the console is taken over by the kernel debugger, this 4023 * function needs to save the current console state, then put the console 4024 * into a state suitable for the kernel debugger. 4025 * 4026 * RETURNS: 4027 * Zero on success, nonzero if a failure occurred when trying to prepare 4028 * the console for the debugger. 4029 */ 4030 int con_debug_enter(struct vc_data *vc) 4031 { 4032 int ret = 0; 4033 4034 saved_fg_console = fg_console; 4035 saved_last_console = last_console; 4036 saved_want_console = want_console; 4037 saved_vc_mode = vc->vc_mode; 4038 saved_console_blanked = console_blanked; 4039 vc->vc_mode = KD_TEXT; 4040 console_blanked = 0; 4041 if (vc->vc_sw->con_debug_enter) 4042 ret = vc->vc_sw->con_debug_enter(vc); 4043 #ifdef CONFIG_KGDB_KDB 4044 /* Set the initial LINES variable if it is not already set */ 4045 if (vc->vc_rows < 999) { 4046 int linecount; 4047 char lns[4]; 4048 const char *setargs[3] = { 4049 "set", 4050 "LINES", 4051 lns, 4052 }; 4053 if (kdbgetintenv(setargs[0], &linecount)) { 4054 snprintf(lns, 4, "%i", vc->vc_rows); 4055 kdb_set(2, setargs); 4056 } 4057 } 4058 if (vc->vc_cols < 999) { 4059 int colcount; 4060 char cols[4]; 4061 const char *setargs[3] = { 4062 "set", 4063 "COLUMNS", 4064 cols, 4065 }; 4066 if (kdbgetintenv(setargs[0], &colcount)) { 4067 snprintf(cols, 4, "%i", vc->vc_cols); 4068 kdb_set(2, setargs); 4069 } 4070 } 4071 #endif /* CONFIG_KGDB_KDB */ 4072 return ret; 4073 } 4074 EXPORT_SYMBOL_GPL(con_debug_enter); 4075 4076 /** 4077 * con_debug_leave - restore console state 4078 * 4079 * Restore the console state to what it was before the kernel debugger 4080 * was invoked. 4081 * 4082 * RETURNS: 4083 * Zero on success, nonzero if a failure occurred when trying to restore 4084 * the console. 4085 */ 4086 int con_debug_leave(void) 4087 { 4088 struct vc_data *vc; 4089 int ret = 0; 4090 4091 fg_console = saved_fg_console; 4092 last_console = saved_last_console; 4093 want_console = saved_want_console; 4094 console_blanked = saved_console_blanked; 4095 vc_cons[fg_console].d->vc_mode = saved_vc_mode; 4096 4097 vc = vc_cons[fg_console].d; 4098 if (vc->vc_sw->con_debug_leave) 4099 ret = vc->vc_sw->con_debug_leave(vc); 4100 return ret; 4101 } 4102 EXPORT_SYMBOL_GPL(con_debug_leave); 4103 4104 static int do_register_con_driver(const struct consw *csw, int first, int last) 4105 { 4106 struct module *owner = csw->owner; 4107 struct con_driver *con_driver; 4108 const char *desc; 4109 int i, retval; 4110 4111 WARN_CONSOLE_UNLOCKED(); 4112 4113 if (!try_module_get(owner)) 4114 return -ENODEV; 4115 4116 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 4117 con_driver = ®istered_con_driver[i]; 4118 4119 /* already registered */ 4120 if (con_driver->con == csw) { 4121 retval = -EBUSY; 4122 goto err; 4123 } 4124 } 4125 4126 desc = csw->con_startup(); 4127 if (!desc) { 4128 retval = -ENODEV; 4129 goto err; 4130 } 4131 4132 retval = -EINVAL; 4133 4134 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 4135 con_driver = ®istered_con_driver[i]; 4136 4137 if (con_driver->con == NULL && 4138 !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) { 4139 con_driver->con = csw; 4140 con_driver->desc = desc; 4141 con_driver->node = i; 4142 con_driver->flag = CON_DRIVER_FLAG_MODULE | 4143 CON_DRIVER_FLAG_INIT; 4144 con_driver->first = first; 4145 con_driver->last = last; 4146 retval = 0; 4147 break; 4148 } 4149 } 4150 4151 if (retval) 4152 goto err; 4153 4154 con_driver->dev = 4155 device_create_with_groups(vtconsole_class, NULL, 4156 MKDEV(0, con_driver->node), 4157 con_driver, con_dev_groups, 4158 "vtcon%i", con_driver->node); 4159 if (IS_ERR(con_driver->dev)) { 4160 pr_warn("Unable to create device for %s; errno = %ld\n", 4161 con_driver->desc, PTR_ERR(con_driver->dev)); 4162 con_driver->dev = NULL; 4163 } else { 4164 vtconsole_init_device(con_driver); 4165 } 4166 4167 err: 4168 module_put(owner); 4169 return retval; 4170 } 4171 4172 4173 /** 4174 * do_unregister_con_driver - unregister console driver from console layer 4175 * @csw: console driver 4176 * 4177 * DESCRIPTION: All drivers that registers to the console layer must 4178 * call this function upon exit, or if the console driver is in a state 4179 * where it won't be able to handle console services, such as the 4180 * framebuffer console without loaded framebuffer drivers. 4181 * 4182 * The driver must unbind first prior to unregistration. 4183 */ 4184 int do_unregister_con_driver(const struct consw *csw) 4185 { 4186 int i; 4187 4188 /* cannot unregister a bound driver */ 4189 if (con_is_bound(csw)) 4190 return -EBUSY; 4191 4192 if (csw == conswitchp) 4193 return -EINVAL; 4194 4195 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 4196 struct con_driver *con_driver = ®istered_con_driver[i]; 4197 4198 if (con_driver->con == csw) { 4199 /* 4200 * Defer the removal of the sysfs entries since that 4201 * will acquire the kernfs s_active lock and we can't 4202 * acquire this lock while holding the console lock: 4203 * the unbind sysfs entry imposes already the opposite 4204 * order. Reset con already here to prevent any later 4205 * lookup to succeed and mark this slot as zombie, so 4206 * it won't get reused until we complete the removal 4207 * in the deferred work. 4208 */ 4209 con_driver->con = NULL; 4210 con_driver->flag = CON_DRIVER_FLAG_ZOMBIE; 4211 schedule_work(&con_driver_unregister_work); 4212 4213 return 0; 4214 } 4215 } 4216 4217 return -ENODEV; 4218 } 4219 EXPORT_SYMBOL_GPL(do_unregister_con_driver); 4220 4221 static void con_driver_unregister_callback(struct work_struct *ignored) 4222 { 4223 int i; 4224 4225 console_lock(); 4226 4227 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 4228 struct con_driver *con_driver = ®istered_con_driver[i]; 4229 4230 if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) 4231 continue; 4232 4233 console_unlock(); 4234 4235 vtconsole_deinit_device(con_driver); 4236 device_destroy(vtconsole_class, MKDEV(0, con_driver->node)); 4237 4238 console_lock(); 4239 4240 if (WARN_ON_ONCE(con_driver->con)) 4241 con_driver->con = NULL; 4242 con_driver->desc = NULL; 4243 con_driver->dev = NULL; 4244 con_driver->node = 0; 4245 WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE); 4246 con_driver->flag = 0; 4247 con_driver->first = 0; 4248 con_driver->last = 0; 4249 } 4250 4251 console_unlock(); 4252 } 4253 4254 /* 4255 * If we support more console drivers, this function is used 4256 * when a driver wants to take over some existing consoles 4257 * and become default driver for newly opened ones. 4258 * 4259 * do_take_over_console is basically a register followed by bind 4260 */ 4261 int do_take_over_console(const struct consw *csw, int first, int last, int deflt) 4262 { 4263 int err; 4264 4265 err = do_register_con_driver(csw, first, last); 4266 /* 4267 * If we get an busy error we still want to bind the console driver 4268 * and return success, as we may have unbound the console driver 4269 * but not unregistered it. 4270 */ 4271 if (err == -EBUSY) 4272 err = 0; 4273 if (!err) 4274 do_bind_con_driver(csw, first, last, deflt); 4275 4276 return err; 4277 } 4278 EXPORT_SYMBOL_GPL(do_take_over_console); 4279 4280 4281 /* 4282 * give_up_console is a wrapper to unregister_con_driver. It will only 4283 * work if driver is fully unbound. 4284 */ 4285 void give_up_console(const struct consw *csw) 4286 { 4287 console_lock(); 4288 do_unregister_con_driver(csw); 4289 console_unlock(); 4290 } 4291 4292 static int __init vtconsole_class_init(void) 4293 { 4294 int i; 4295 4296 vtconsole_class = class_create(THIS_MODULE, "vtconsole"); 4297 if (IS_ERR(vtconsole_class)) { 4298 pr_warn("Unable to create vt console class; errno = %ld\n", 4299 PTR_ERR(vtconsole_class)); 4300 vtconsole_class = NULL; 4301 } 4302 4303 /* Add system drivers to sysfs */ 4304 for (i = 0; i < MAX_NR_CON_DRIVER; i++) { 4305 struct con_driver *con = ®istered_con_driver[i]; 4306 4307 if (con->con && !con->dev) { 4308 con->dev = 4309 device_create_with_groups(vtconsole_class, NULL, 4310 MKDEV(0, con->node), 4311 con, con_dev_groups, 4312 "vtcon%i", con->node); 4313 4314 if (IS_ERR(con->dev)) { 4315 pr_warn("Unable to create device for %s; errno = %ld\n", 4316 con->desc, PTR_ERR(con->dev)); 4317 con->dev = NULL; 4318 } else { 4319 vtconsole_init_device(con); 4320 } 4321 } 4322 } 4323 4324 return 0; 4325 } 4326 postcore_initcall(vtconsole_class_init); 4327 4328 #endif 4329 4330 /* 4331 * Screen blanking 4332 */ 4333 4334 static int set_vesa_blanking(char __user *p) 4335 { 4336 unsigned int mode; 4337 4338 if (get_user(mode, p + 1)) 4339 return -EFAULT; 4340 4341 vesa_blank_mode = (mode < 4) ? mode : 0; 4342 return 0; 4343 } 4344 4345 void do_blank_screen(int entering_gfx) 4346 { 4347 struct vc_data *vc = vc_cons[fg_console].d; 4348 int i; 4349 4350 might_sleep(); 4351 4352 WARN_CONSOLE_UNLOCKED(); 4353 4354 if (console_blanked) { 4355 if (blank_state == blank_vesa_wait) { 4356 blank_state = blank_off; 4357 vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0); 4358 } 4359 return; 4360 } 4361 4362 /* entering graphics mode? */ 4363 if (entering_gfx) { 4364 hide_cursor(vc); 4365 save_screen(vc); 4366 vc->vc_sw->con_blank(vc, -1, 1); 4367 console_blanked = fg_console + 1; 4368 blank_state = blank_off; 4369 set_origin(vc); 4370 return; 4371 } 4372 4373 blank_state = blank_off; 4374 4375 /* don't blank graphics */ 4376 if (vc->vc_mode != KD_TEXT) { 4377 console_blanked = fg_console + 1; 4378 return; 4379 } 4380 4381 hide_cursor(vc); 4382 del_timer_sync(&console_timer); 4383 blank_timer_expired = 0; 4384 4385 save_screen(vc); 4386 /* In case we need to reset origin, blanking hook returns 1 */ 4387 i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0); 4388 console_blanked = fg_console + 1; 4389 if (i) 4390 set_origin(vc); 4391 4392 if (console_blank_hook && console_blank_hook(1)) 4393 return; 4394 4395 if (vesa_off_interval && vesa_blank_mode) { 4396 blank_state = blank_vesa_wait; 4397 mod_timer(&console_timer, jiffies + vesa_off_interval); 4398 } 4399 vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num); 4400 } 4401 EXPORT_SYMBOL(do_blank_screen); 4402 4403 /* 4404 * Called by timer as well as from vt_console_driver 4405 */ 4406 void do_unblank_screen(int leaving_gfx) 4407 { 4408 struct vc_data *vc; 4409 4410 /* This should now always be called from a "sane" (read: can schedule) 4411 * context for the sake of the low level drivers, except in the special 4412 * case of oops_in_progress 4413 */ 4414 if (!oops_in_progress) 4415 might_sleep(); 4416 4417 WARN_CONSOLE_UNLOCKED(); 4418 4419 ignore_poke = 0; 4420 if (!console_blanked) 4421 return; 4422 if (!vc_cons_allocated(fg_console)) { 4423 /* impossible */ 4424 pr_warn("unblank_screen: tty %d not allocated ??\n", 4425 fg_console + 1); 4426 return; 4427 } 4428 vc = vc_cons[fg_console].d; 4429 if (vc->vc_mode != KD_TEXT) 4430 return; /* but leave console_blanked != 0 */ 4431 4432 if (blankinterval) { 4433 mod_timer(&console_timer, jiffies + (blankinterval * HZ)); 4434 blank_state = blank_normal_wait; 4435 } 4436 4437 console_blanked = 0; 4438 if (vc->vc_sw->con_blank(vc, 0, leaving_gfx)) 4439 /* Low-level driver cannot restore -> do it ourselves */ 4440 update_screen(vc); 4441 if (console_blank_hook) 4442 console_blank_hook(0); 4443 set_palette(vc); 4444 set_cursor(vc); 4445 vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num); 4446 } 4447 EXPORT_SYMBOL(do_unblank_screen); 4448 4449 /* 4450 * This is called by the outside world to cause a forced unblank, mostly for 4451 * oopses. Currently, I just call do_unblank_screen(0), but we could eventually 4452 * call it with 1 as an argument and so force a mode restore... that may kill 4453 * X or at least garbage the screen but would also make the Oops visible... 4454 */ 4455 void unblank_screen(void) 4456 { 4457 do_unblank_screen(0); 4458 } 4459 4460 /* 4461 * We defer the timer blanking to work queue so it can take the console mutex 4462 * (console operations can still happen at irq time, but only from printk which 4463 * has the console mutex. Not perfect yet, but better than no locking 4464 */ 4465 static void blank_screen_t(struct timer_list *unused) 4466 { 4467 blank_timer_expired = 1; 4468 schedule_work(&console_work); 4469 } 4470 4471 void poke_blanked_console(void) 4472 { 4473 WARN_CONSOLE_UNLOCKED(); 4474 4475 /* Add this so we quickly catch whoever might call us in a non 4476 * safe context. Nowadays, unblank_screen() isn't to be called in 4477 * atomic contexts and is allowed to schedule (with the special case 4478 * of oops_in_progress, but that isn't of any concern for this 4479 * function. --BenH. 4480 */ 4481 might_sleep(); 4482 4483 /* This isn't perfectly race free, but a race here would be mostly harmless, 4484 * at worst, we'll do a spurious blank and it's unlikely 4485 */ 4486 del_timer(&console_timer); 4487 blank_timer_expired = 0; 4488 4489 if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS) 4490 return; 4491 if (console_blanked) 4492 unblank_screen(); 4493 else if (blankinterval) { 4494 mod_timer(&console_timer, jiffies + (blankinterval * HZ)); 4495 blank_state = blank_normal_wait; 4496 } 4497 } 4498 4499 /* 4500 * Palettes 4501 */ 4502 4503 static void set_palette(struct vc_data *vc) 4504 { 4505 WARN_CONSOLE_UNLOCKED(); 4506 4507 if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette) 4508 vc->vc_sw->con_set_palette(vc, color_table); 4509 } 4510 4511 /* 4512 * Load palette into the DAC registers. arg points to a colour 4513 * map, 3 bytes per colour, 16 colours, range from 0 to 255. 4514 */ 4515 4516 int con_set_cmap(unsigned char __user *arg) 4517 { 4518 int i, j, k; 4519 unsigned char colormap[3*16]; 4520 4521 if (copy_from_user(colormap, arg, sizeof(colormap))) 4522 return -EFAULT; 4523 4524 console_lock(); 4525 for (i = k = 0; i < 16; i++) { 4526 default_red[i] = colormap[k++]; 4527 default_grn[i] = colormap[k++]; 4528 default_blu[i] = colormap[k++]; 4529 } 4530 for (i = 0; i < MAX_NR_CONSOLES; i++) { 4531 if (!vc_cons_allocated(i)) 4532 continue; 4533 for (j = k = 0; j < 16; j++) { 4534 vc_cons[i].d->vc_palette[k++] = default_red[j]; 4535 vc_cons[i].d->vc_palette[k++] = default_grn[j]; 4536 vc_cons[i].d->vc_palette[k++] = default_blu[j]; 4537 } 4538 set_palette(vc_cons[i].d); 4539 } 4540 console_unlock(); 4541 4542 return 0; 4543 } 4544 4545 int con_get_cmap(unsigned char __user *arg) 4546 { 4547 int i, k; 4548 unsigned char colormap[3*16]; 4549 4550 console_lock(); 4551 for (i = k = 0; i < 16; i++) { 4552 colormap[k++] = default_red[i]; 4553 colormap[k++] = default_grn[i]; 4554 colormap[k++] = default_blu[i]; 4555 } 4556 console_unlock(); 4557 4558 if (copy_to_user(arg, colormap, sizeof(colormap))) 4559 return -EFAULT; 4560 4561 return 0; 4562 } 4563 4564 void reset_palette(struct vc_data *vc) 4565 { 4566 int j, k; 4567 for (j=k=0; j<16; j++) { 4568 vc->vc_palette[k++] = default_red[j]; 4569 vc->vc_palette[k++] = default_grn[j]; 4570 vc->vc_palette[k++] = default_blu[j]; 4571 } 4572 set_palette(vc); 4573 } 4574 4575 /* 4576 * Font switching 4577 * 4578 * Currently we only support fonts up to 32 pixels wide, at a maximum height 4579 * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints, 4580 * depending on width) reserved for each character which is kinda wasty, but 4581 * this is done in order to maintain compatibility with the EGA/VGA fonts. It 4582 * is up to the actual low-level console-driver convert data into its favorite 4583 * format (maybe we should add a `fontoffset' field to the `display' 4584 * structure so we won't have to convert the fontdata all the time. 4585 * /Jes 4586 */ 4587 4588 #define max_font_size 65536 4589 4590 static int con_font_get(struct vc_data *vc, struct console_font_op *op) 4591 { 4592 struct console_font font; 4593 int rc = -EINVAL; 4594 int c; 4595 4596 if (op->data) { 4597 font.data = kmalloc(max_font_size, GFP_KERNEL); 4598 if (!font.data) 4599 return -ENOMEM; 4600 } else 4601 font.data = NULL; 4602 4603 console_lock(); 4604 if (vc->vc_mode != KD_TEXT) 4605 rc = -EINVAL; 4606 else if (vc->vc_sw->con_font_get) 4607 rc = vc->vc_sw->con_font_get(vc, &font); 4608 else 4609 rc = -ENOSYS; 4610 console_unlock(); 4611 4612 if (rc) 4613 goto out; 4614 4615 c = (font.width+7)/8 * 32 * font.charcount; 4616 4617 if (op->data && font.charcount > op->charcount) 4618 rc = -ENOSPC; 4619 if (font.width > op->width || font.height > op->height) 4620 rc = -ENOSPC; 4621 if (rc) 4622 goto out; 4623 4624 op->height = font.height; 4625 op->width = font.width; 4626 op->charcount = font.charcount; 4627 4628 if (op->data && copy_to_user(op->data, font.data, c)) 4629 rc = -EFAULT; 4630 4631 out: 4632 kfree(font.data); 4633 return rc; 4634 } 4635 4636 static int con_font_set(struct vc_data *vc, struct console_font_op *op) 4637 { 4638 struct console_font font; 4639 int rc = -EINVAL; 4640 int size; 4641 4642 if (vc->vc_mode != KD_TEXT) 4643 return -EINVAL; 4644 if (!op->data) 4645 return -EINVAL; 4646 if (op->charcount > 512) 4647 return -EINVAL; 4648 if (op->width <= 0 || op->width > 32 || !op->height || op->height > 32) 4649 return -EINVAL; 4650 size = (op->width+7)/8 * 32 * op->charcount; 4651 if (size > max_font_size) 4652 return -ENOSPC; 4653 4654 font.data = memdup_user(op->data, size); 4655 if (IS_ERR(font.data)) 4656 return PTR_ERR(font.data); 4657 4658 font.charcount = op->charcount; 4659 font.width = op->width; 4660 font.height = op->height; 4661 4662 console_lock(); 4663 if (vc->vc_mode != KD_TEXT) 4664 rc = -EINVAL; 4665 else if (vc->vc_sw->con_font_set) 4666 rc = vc->vc_sw->con_font_set(vc, &font, op->flags); 4667 else 4668 rc = -ENOSYS; 4669 console_unlock(); 4670 kfree(font.data); 4671 return rc; 4672 } 4673 4674 static int con_font_default(struct vc_data *vc, struct console_font_op *op) 4675 { 4676 struct console_font font = {.width = op->width, .height = op->height}; 4677 char name[MAX_FONT_NAME]; 4678 char *s = name; 4679 int rc; 4680 4681 4682 if (!op->data) 4683 s = NULL; 4684 else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0) 4685 return -EFAULT; 4686 else 4687 name[MAX_FONT_NAME - 1] = 0; 4688 4689 console_lock(); 4690 if (vc->vc_mode != KD_TEXT) { 4691 console_unlock(); 4692 return -EINVAL; 4693 } 4694 if (vc->vc_sw->con_font_default) 4695 rc = vc->vc_sw->con_font_default(vc, &font, s); 4696 else 4697 rc = -ENOSYS; 4698 console_unlock(); 4699 if (!rc) { 4700 op->width = font.width; 4701 op->height = font.height; 4702 } 4703 return rc; 4704 } 4705 4706 int con_font_op(struct vc_data *vc, struct console_font_op *op) 4707 { 4708 switch (op->op) { 4709 case KD_FONT_OP_SET: 4710 return con_font_set(vc, op); 4711 case KD_FONT_OP_GET: 4712 return con_font_get(vc, op); 4713 case KD_FONT_OP_SET_DEFAULT: 4714 return con_font_default(vc, op); 4715 case KD_FONT_OP_COPY: 4716 /* was buggy and never really used */ 4717 return -EINVAL; 4718 } 4719 return -ENOSYS; 4720 } 4721 4722 /* 4723 * Interface exported to selection and vcs. 4724 */ 4725 4726 /* used by selection */ 4727 u16 screen_glyph(const struct vc_data *vc, int offset) 4728 { 4729 u16 w = scr_readw(screenpos(vc, offset, true)); 4730 u16 c = w & 0xff; 4731 4732 if (w & vc->vc_hi_font_mask) 4733 c |= 0x100; 4734 return c; 4735 } 4736 EXPORT_SYMBOL_GPL(screen_glyph); 4737 4738 u32 screen_glyph_unicode(const struct vc_data *vc, int n) 4739 { 4740 struct uni_screen *uniscr = get_vc_uniscr(vc); 4741 4742 if (uniscr) 4743 return uniscr->lines[n / vc->vc_cols][n % vc->vc_cols]; 4744 return inverse_translate(vc, screen_glyph(vc, n * 2), 1); 4745 } 4746 EXPORT_SYMBOL_GPL(screen_glyph_unicode); 4747 4748 /* used by vcs - note the word offset */ 4749 unsigned short *screen_pos(const struct vc_data *vc, int w_offset, bool viewed) 4750 { 4751 return screenpos(vc, 2 * w_offset, viewed); 4752 } 4753 EXPORT_SYMBOL_GPL(screen_pos); 4754 4755 void getconsxy(const struct vc_data *vc, unsigned char xy[static 2]) 4756 { 4757 /* clamp values if they don't fit */ 4758 xy[0] = min(vc->state.x, 0xFFu); 4759 xy[1] = min(vc->state.y, 0xFFu); 4760 } 4761 4762 void putconsxy(struct vc_data *vc, unsigned char xy[static const 2]) 4763 { 4764 hide_cursor(vc); 4765 gotoxy(vc, xy[0], xy[1]); 4766 set_cursor(vc); 4767 } 4768 4769 u16 vcs_scr_readw(const struct vc_data *vc, const u16 *org) 4770 { 4771 if ((unsigned long)org == vc->vc_pos && softcursor_original != -1) 4772 return softcursor_original; 4773 return scr_readw(org); 4774 } 4775 4776 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org) 4777 { 4778 scr_writew(val, org); 4779 if ((unsigned long)org == vc->vc_pos) { 4780 softcursor_original = -1; 4781 add_softcursor(vc); 4782 } 4783 } 4784 4785 void vcs_scr_updated(struct vc_data *vc) 4786 { 4787 notify_update(vc); 4788 } 4789 4790 void vc_scrolldelta_helper(struct vc_data *c, int lines, 4791 unsigned int rolled_over, void *base, unsigned int size) 4792 { 4793 unsigned long ubase = (unsigned long)base; 4794 ptrdiff_t scr_end = (void *)c->vc_scr_end - base; 4795 ptrdiff_t vorigin = (void *)c->vc_visible_origin - base; 4796 ptrdiff_t origin = (void *)c->vc_origin - base; 4797 int margin = c->vc_size_row * 4; 4798 int from, wrap, from_off, avail; 4799 4800 /* Turn scrollback off */ 4801 if (!lines) { 4802 c->vc_visible_origin = c->vc_origin; 4803 return; 4804 } 4805 4806 /* Do we have already enough to allow jumping from 0 to the end? */ 4807 if (rolled_over > scr_end + margin) { 4808 from = scr_end; 4809 wrap = rolled_over + c->vc_size_row; 4810 } else { 4811 from = 0; 4812 wrap = size; 4813 } 4814 4815 from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row; 4816 avail = (origin - from + wrap) % wrap; 4817 4818 /* Only a little piece would be left? Show all incl. the piece! */ 4819 if (avail < 2 * margin) 4820 margin = 0; 4821 if (from_off < margin) 4822 from_off = 0; 4823 if (from_off > avail - margin) 4824 from_off = avail; 4825 4826 c->vc_visible_origin = ubase + (from + from_off) % wrap; 4827 } 4828 EXPORT_SYMBOL_GPL(vc_scrolldelta_helper); 4829 4830 /* 4831 * Visible symbols for modules 4832 */ 4833 4834 EXPORT_SYMBOL(color_table); 4835 EXPORT_SYMBOL(default_red); 4836 EXPORT_SYMBOL(default_grn); 4837 EXPORT_SYMBOL(default_blu); 4838 EXPORT_SYMBOL(update_region); 4839 EXPORT_SYMBOL(redraw_screen); 4840 EXPORT_SYMBOL(vc_resize); 4841 EXPORT_SYMBOL(fg_console); 4842 EXPORT_SYMBOL(console_blank_hook); 4843 EXPORT_SYMBOL(console_blanked); 4844 EXPORT_SYMBOL(vc_cons); 4845 EXPORT_SYMBOL(global_cursor_default); 4846 #ifndef VT_SINGLE_DRIVER 4847 EXPORT_SYMBOL(give_up_console); 4848 #endif 4849