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