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