1 // SPDX-License-Identifier: GPL-2.0+
3 * EFI application console interface
5 * Copyright (c) 2016 Alexander Graf
8 #define LOG_CATEGORY LOGC_EFI
15 #include <dm/device.h>
16 #include <efi_loader.h>
19 #include <stdio_dev.h>
20 #include <video_console.h>
21 #include <linux/delay.h>
23 #define EFI_COUT_MODE_2 2
24 #define EFI_MAX_COUT_MODE 3
27 unsigned long columns;
32 __maybe_unused static struct efi_object uart_obj;
34 static struct cout_mode efi_cout_modes[] = {
35 /* EFI Mode 0 is 80x25 and always present */
41 /* EFI Mode 1 is always 80x50 */
47 /* Value are unknown until we query the console */
55 const efi_guid_t efi_guid_text_input_ex_protocol =
56 EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL_GUID;
57 const efi_guid_t efi_guid_text_input_protocol =
58 EFI_SIMPLE_TEXT_INPUT_PROTOCOL_GUID;
59 const efi_guid_t efi_guid_text_output_protocol =
60 EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL_GUID;
66 * efi_con_mode - mode information of the Simple Text Output Protocol
68 * Use safe settings before efi_setup_console_size() is called.
69 * By default enable only the 80x25 mode which must always exist.
71 static struct simple_text_output_mode efi_con_mode = {
80 static int term_get_char(s32 *c)
84 /* Wait up to 100 ms for a character */
85 timeout = timer_get_us() + 100000;
88 if (timer_get_us() > timeout)
96 * Receive and parse a reply from the terminal.
98 * @n: array of return values
99 * @num: number of return values expected
100 * @end_char: character indicating end of terminal message
101 * Return: non-zero indicates error
103 static int term_read_reply(int *n, int num, char end_char)
108 if (term_get_char(&c) || c != cESC)
111 if (term_get_char(&c) || c != '[')
116 if (!term_get_char(&c)) {
123 } else if (c == end_char) {
125 } else if (c > '9' || c < '0') {
129 /* Read one more decimal position */
143 * efi_cout_output_string() - write Unicode string to console
145 * This function implements the OutputString service of the simple text output
146 * protocol. See the Unified Extensible Firmware Interface (UEFI) specification
149 * @this: simple text output protocol
150 * @string: u16 string
151 * Return: status code
153 static efi_status_t EFIAPI efi_cout_output_string(
154 struct efi_simple_text_output_protocol *this,
157 struct simple_text_output_mode *con = &efi_con_mode;
158 struct cout_mode *mode = &efi_cout_modes[con->mode];
161 efi_status_t ret = EFI_SUCCESS;
163 EFI_ENTRY("%p, %p", this, string);
165 if (!this || !string) {
166 ret = EFI_INVALID_PARAMETER;
170 buf = malloc(utf16_utf8_strlen(string) + 1);
172 ret = EFI_OUT_OF_RESOURCES;
176 utf16_utf8_strcpy(&pos, string);
181 * Update the cursor position.
183 * The UEFI spec provides advance rules for U+0000, U+0008, U+000A,
184 * and U000D. All other control characters are ignored. Any non-control
185 * character increase the column by one.
187 for (p = string; *p; ++p) {
189 case '\b': /* U+0008, backspace */
190 if (con->cursor_column)
191 con->cursor_column--;
193 case '\n': /* U+000A, newline */
194 con->cursor_column = 0;
197 case '\r': /* U+000D, carriage-return */
198 con->cursor_column = 0;
200 case 0xd800 ... 0xdbff:
202 * Ignore high surrogates, we do not want to count a
203 * Unicode character twice.
207 /* Exclude control codes */
209 con->cursor_column++;
212 if (con->cursor_column >= mode->columns) {
213 con->cursor_column = 0;
217 * When we exceed the row count the terminal will scroll up one
218 * line. We have to adjust the cursor position.
220 if (con->cursor_row >= mode->rows && con->cursor_row)
225 return EFI_EXIT(ret);
229 * efi_cout_test_string() - test writing Unicode string to console
231 * This function implements the TestString service of the simple text output
232 * protocol. See the Unified Extensible Firmware Interface (UEFI) specification
235 * As in OutputString we simply convert UTF-16 to UTF-8 there are no unsupported
236 * code points and we can always return EFI_SUCCESS.
238 * @this: simple text output protocol
239 * @string: u16 string
240 * Return: status code
242 static efi_status_t EFIAPI efi_cout_test_string(
243 struct efi_simple_text_output_protocol *this,
246 EFI_ENTRY("%p, %p", this, string);
247 return EFI_EXIT(EFI_SUCCESS);
251 * cout_mode_matches() - check if mode has given terminal size
254 * @rows: number of rows
255 * @cols: number of columns
256 * Return: true if number of rows and columns matches the mode and
257 * the mode is present
259 static bool cout_mode_matches(struct cout_mode *mode, int rows, int cols)
264 return (mode->rows == rows) && (mode->columns == cols);
268 * query_console_serial() - query serial console size
270 * When using a serial console or the net console we can only devise the
271 * terminal size by querying the terminal using ECMA-48 control sequences.
273 * @rows: pointer to return number of rows
274 * @cols: pointer to return number of columns
275 * Returns: 0 on success
277 static int query_console_serial(int *rows, int *cols)
282 /* Empty input buffer */
287 * Not all terminals understand CSI [18t for querying the console size.
288 * We should adhere to escape sequences documented in the console_codes
289 * man page and the ECMA-48 standard.
291 * So here we follow a different approach. We position the cursor to the
292 * bottom right and query its position. Before leaving the function we
293 * restore the original cursor position.
295 printf(ESC "7" /* Save cursor position */
296 ESC "[r" /* Set scrolling region to full window */
297 ESC "[999;999H" /* Move to bottom right corner */
298 ESC "[6n"); /* Query cursor position */
300 /* Read {rows,cols} */
301 if (term_read_reply(n, 2, 'R')) {
309 printf(ESC "8"); /* Restore cursor position */
314 * query_vidconsole() - query video console size
317 * @rows: pointer to return number of rows
318 * @cols: pointer to return number of columns
319 * Returns: 0 on success
321 static int __maybe_unused query_vidconsole(int *rows, int *cols)
323 const char *stdout_name = env_get("stdout");
324 struct stdio_dev *stdout_dev;
326 struct vidconsole_priv *priv;
328 if (!stdout_name || strncmp(stdout_name, "vidconsole", 10))
330 stdout_dev = stdio_get_by_name("vidconsole");
333 dev = stdout_dev->priv;
336 priv = dev_get_uclass_priv(dev);
345 * efi_setup_console_size() - update the mode table.
347 * By default the only mode available is 80x25. If the console has at least 50
348 * lines, enable mode 80x50. If we can query the console size and it is neither
349 * 80x25 nor 80x50, set it as an additional mode.
351 void efi_setup_console_size(void)
353 int rows = 25, cols = 80;
356 if (IS_ENABLED(CONFIG_DM_VIDEO))
357 ret = query_vidconsole(&rows, &cols);
359 ret = query_console_serial(&rows, &cols);
363 log_debug("Console size %dx%d\n", rows, cols);
365 /* Test if we can have Mode 1 */
366 if (cols >= 80 && rows >= 50) {
367 efi_cout_modes[1].present = 1;
368 efi_con_mode.max_mode = 2;
372 * Install our mode as mode 2 if it is different
373 * than mode 0 or 1 and set it as the currently selected mode
375 if (!cout_mode_matches(&efi_cout_modes[0], rows, cols) &&
376 !cout_mode_matches(&efi_cout_modes[1], rows, cols)) {
377 efi_cout_modes[EFI_COUT_MODE_2].columns = cols;
378 efi_cout_modes[EFI_COUT_MODE_2].rows = rows;
379 efi_cout_modes[EFI_COUT_MODE_2].present = 1;
380 efi_con_mode.max_mode = EFI_MAX_COUT_MODE;
381 efi_con_mode.mode = EFI_COUT_MODE_2;
386 * efi_cout_query_mode() - get terminal size for a text mode
388 * This function implements the QueryMode service of the simple text output
389 * protocol. See the Unified Extensible Firmware Interface (UEFI) specification
392 * @this: simple text output protocol
393 * @mode_number: mode number to retrieve information on
394 * @columns: number of columns
395 * @rows: number of rows
396 * Return: status code
398 static efi_status_t EFIAPI efi_cout_query_mode(
399 struct efi_simple_text_output_protocol *this,
400 unsigned long mode_number, unsigned long *columns,
403 EFI_ENTRY("%p, %ld, %p, %p", this, mode_number, columns, rows);
405 if (mode_number >= efi_con_mode.max_mode)
406 return EFI_EXIT(EFI_UNSUPPORTED);
408 if (efi_cout_modes[mode_number].present != 1)
409 return EFI_EXIT(EFI_UNSUPPORTED);
412 *columns = efi_cout_modes[mode_number].columns;
414 *rows = efi_cout_modes[mode_number].rows;
416 return EFI_EXIT(EFI_SUCCESS);
419 static const struct {
423 { 30, 40 }, /* 0: black */
424 { 34, 44 }, /* 1: blue */
425 { 32, 42 }, /* 2: green */
426 { 36, 46 }, /* 3: cyan */
427 { 31, 41 }, /* 4: red */
428 { 35, 45 }, /* 5: magenta */
429 { 33, 43 }, /* 6: brown, map to yellow as EDK2 does*/
430 { 37, 47 }, /* 7: light gray, map to white */
434 * efi_cout_set_attribute() - set fore- and background color
436 * This function implements the SetAttribute service of the simple text output
437 * protocol. See the Unified Extensible Firmware Interface (UEFI) specification
440 * @this: simple text output protocol
441 * @attribute: foreground color - bits 0-3, background color - bits 4-6
442 * Return: status code
444 static efi_status_t EFIAPI efi_cout_set_attribute(
445 struct efi_simple_text_output_protocol *this,
446 unsigned long attribute)
448 unsigned int bold = EFI_ATTR_BOLD(attribute);
449 unsigned int fg = EFI_ATTR_FG(attribute);
450 unsigned int bg = EFI_ATTR_BG(attribute);
452 EFI_ENTRY("%p, %lx", this, attribute);
454 efi_con_mode.attribute = attribute;
456 printf(ESC"[%u;%u;%um", bold, color[fg].fg, color[bg].bg);
458 printf(ESC"[0;37;40m");
460 return EFI_EXIT(EFI_SUCCESS);
464 * efi_cout_clear_screen() - clear screen
466 * This function implements the ClearScreen service of the simple text output
467 * protocol. See the Unified Extensible Firmware Interface (UEFI) specification
470 * @this: pointer to the protocol instance
471 * Return: status code
473 static efi_status_t EFIAPI efi_cout_clear_screen(
474 struct efi_simple_text_output_protocol *this)
476 EFI_ENTRY("%p", this);
479 * The Linux console wants both a clear and a home command. The video
480 * uclass does not support <ESC>[H without coordinates, yet.
482 printf(ESC "[2J" ESC "[1;1H");
483 efi_con_mode.cursor_column = 0;
484 efi_con_mode.cursor_row = 0;
486 return EFI_EXIT(EFI_SUCCESS);
490 * efi_cout_clear_set_mode() - set text model
492 * This function implements the SetMode service of the simple text output
493 * protocol. See the Unified Extensible Firmware Interface (UEFI) specification
496 * @this: pointer to the protocol instance
497 * @mode_number: number of the text mode to set
498 * Return: status code
500 static efi_status_t EFIAPI efi_cout_set_mode(
501 struct efi_simple_text_output_protocol *this,
502 unsigned long mode_number)
504 EFI_ENTRY("%p, %ld", this, mode_number);
506 if (mode_number >= efi_con_mode.max_mode)
507 return EFI_EXIT(EFI_UNSUPPORTED);
509 if (!efi_cout_modes[mode_number].present)
510 return EFI_EXIT(EFI_UNSUPPORTED);
512 efi_con_mode.mode = mode_number;
513 EFI_CALL(efi_cout_clear_screen(this));
515 return EFI_EXIT(EFI_SUCCESS);
519 * efi_cout_reset() - reset the terminal
521 * This function implements the Reset service of the simple text output
522 * protocol. See the Unified Extensible Firmware Interface (UEFI) specification
525 * @this: pointer to the protocol instance
526 * @extended_verification: if set an extended verification may be executed
527 * Return: status code
529 static efi_status_t EFIAPI efi_cout_reset(
530 struct efi_simple_text_output_protocol *this,
531 char extended_verification)
533 EFI_ENTRY("%p, %d", this, extended_verification);
535 /* Set default colors */
536 efi_con_mode.attribute = 0x07;
537 printf(ESC "[0;37;40m");
539 EFI_CALL(efi_cout_clear_screen(this));
541 return EFI_EXIT(EFI_SUCCESS);
545 * efi_cout_set_cursor_position() - reset the terminal
547 * This function implements the SetCursorPosition service of the simple text
548 * output protocol. See the Unified Extensible Firmware Interface (UEFI)
549 * specification for details.
551 * @this: pointer to the protocol instance
552 * @column: column to move to
553 * @row: row to move to
554 * Return: status code
556 static efi_status_t EFIAPI efi_cout_set_cursor_position(
557 struct efi_simple_text_output_protocol *this,
558 unsigned long column, unsigned long row)
560 efi_status_t ret = EFI_SUCCESS;
561 struct simple_text_output_mode *con = &efi_con_mode;
562 struct cout_mode *mode = &efi_cout_modes[con->mode];
564 EFI_ENTRY("%p, %ld, %ld", this, column, row);
566 /* Check parameters */
568 ret = EFI_INVALID_PARAMETER;
571 if (row >= mode->rows || column >= mode->columns) {
572 ret = EFI_UNSUPPORTED;
577 * Set cursor position by sending CSI H.
578 * EFI origin is [0, 0], terminal origin is [1, 1].
580 printf(ESC "[%d;%dH", (int)row + 1, (int)column + 1);
581 efi_con_mode.cursor_column = column;
582 efi_con_mode.cursor_row = row;
584 return EFI_EXIT(ret);
588 * efi_cout_enable_cursor() - enable the cursor
590 * This function implements the EnableCursor service of the simple text output
591 * protocol. See the Unified Extensible Firmware Interface (UEFI) specification
594 * @this: pointer to the protocol instance
595 * @enable: if true enable, if false disable the cursor
596 * Return: status code
598 static efi_status_t EFIAPI efi_cout_enable_cursor(
599 struct efi_simple_text_output_protocol *this,
602 EFI_ENTRY("%p, %d", this, enable);
604 printf(ESC"[?25%c", enable ? 'h' : 'l');
605 efi_con_mode.cursor_visible = !!enable;
607 return EFI_EXIT(EFI_SUCCESS);
610 struct efi_simple_text_output_protocol efi_con_out = {
611 .reset = efi_cout_reset,
612 .output_string = efi_cout_output_string,
613 .test_string = efi_cout_test_string,
614 .query_mode = efi_cout_query_mode,
615 .set_mode = efi_cout_set_mode,
616 .set_attribute = efi_cout_set_attribute,
617 .clear_screen = efi_cout_clear_screen,
618 .set_cursor_position = efi_cout_set_cursor_position,
619 .enable_cursor = efi_cout_enable_cursor,
620 .mode = (void*)&efi_con_mode,
624 * struct efi_cin_notify_function - registered console input notify function
626 * @link: link to list
627 * @key: key to notify
628 * @function: function to call
630 struct efi_cin_notify_function {
631 struct list_head link;
632 struct efi_key_data key;
633 efi_status_t (EFIAPI *function)
634 (struct efi_key_data *key_data);
637 static bool key_available;
638 static struct efi_key_data next_key;
639 static LIST_HEAD(cin_notify_functions);
642 * set_shift_mask() - set shift mask
644 * @mod: Xterm shift mask
645 * @key_state: receives the state of the shift, alt, control, and logo keys
647 void set_shift_mask(int mod, struct efi_key_state *key_state)
649 key_state->key_shift_state = EFI_SHIFT_STATE_VALID;
653 key_state->key_shift_state |= EFI_LEFT_SHIFT_PRESSED;
655 key_state->key_shift_state |= EFI_LEFT_ALT_PRESSED;
657 key_state->key_shift_state |= EFI_LEFT_CONTROL_PRESSED;
658 if (!mod || (mod & 8))
659 key_state->key_shift_state |= EFI_LEFT_LOGO_PRESSED;
664 * analyze_modifiers() - analyze modifiers (shift, alt, ctrl) for function keys
666 * This gets called when we have already parsed CSI.
668 * @key_state: receives the state of the shift, alt, control, and logo keys
669 * Return: the unmodified code
671 static int analyze_modifiers(struct efi_key_state *key_state)
673 int c, mod = 0, ret = 0;
697 set_shift_mask(mod, key_state);
704 * efi_cin_read_key() - read a key from the console input
706 * @key: - key received
707 * Return: - status code
709 static efi_status_t efi_cin_read_key(struct efi_key_data *key)
711 struct efi_input_key pressed_key = {
717 if (console_read_unicode(&ch))
718 return EFI_NOT_READY;
720 key->key_state.key_shift_state = EFI_SHIFT_STATE_INVALID;
721 key->key_state.key_toggle_state = EFI_TOGGLE_STATE_INVALID;
723 /* We do not support multi-word codes */
730 * If a second key is received within 10 ms, assume that we are
731 * dealing with an escape sequence. Otherwise consider this the
732 * escape key being hit. 10 ms is long enough to work fine at
733 * 1200 baud and above.
737 pressed_key.scan_code = 23;
741 * Xterm Control Sequences
742 * https://www.xfree86.org/4.8.0/ctlseqs.html
747 pressed_key.scan_code = 23;
749 case 'O': /* F1 - F4, End */
751 /* consider modifiers */
752 if (ch == 'F') { /* End */
753 pressed_key.scan_code = 6;
755 } else if (ch < 'P') {
756 set_shift_mask(ch - '0', &key->key_state);
759 pressed_key.scan_code = ch - 'P' + 11;
764 case 'A'...'D': /* up, down right, left */
765 pressed_key.scan_code = ch - 'A' + 1;
768 pressed_key.scan_code = 6;
771 pressed_key.scan_code = 5;
774 ch = analyze_modifiers(&key->key_state);
776 case '1'...'5': /* F1 - F5 */
777 pressed_key.scan_code = ch - '1' + 11;
779 case '6'...'9': /* F5 - F8 */
780 pressed_key.scan_code = ch - '6' + 15;
782 case 'A'...'D': /* up, down right, left */
783 pressed_key.scan_code = ch - 'A' + 1;
786 pressed_key.scan_code = 6;
789 pressed_key.scan_code = 5;
792 pressed_key.scan_code = 5;
797 ch = analyze_modifiers(&key->key_state);
799 case '0'...'1': /* F9 - F10 */
800 pressed_key.scan_code = ch - '0' + 19;
802 case '3'...'4': /* F11 - F12 */
803 pressed_key.scan_code = ch - '3' + 21;
806 pressed_key.scan_code = 7;
811 pressed_key.scan_code = 8;
812 analyze_modifiers(&key->key_state);
814 case '5': /* PG UP */
815 pressed_key.scan_code = 9;
816 analyze_modifiers(&key->key_state);
818 case '6': /* PG DOWN */
819 pressed_key.scan_code = 10;
820 analyze_modifiers(&key->key_state);
826 set_shift_mask(3, &key->key_state);
833 if (pressed_key.scan_code) {
834 key->key_state.key_shift_state |= EFI_SHIFT_STATE_VALID;
836 pressed_key.unicode_char = ch;
839 * Assume left control key for control characters typically
840 * entered using the control key.
842 if (ch >= 0x01 && ch <= 0x1f) {
843 key->key_state.key_shift_state |=
844 EFI_SHIFT_STATE_VALID;
849 key->key_state.key_shift_state |=
850 EFI_LEFT_CONTROL_PRESSED;
854 key->key = pressed_key;
860 * efi_cin_notify() - notify registered functions
862 static void efi_cin_notify(void)
864 struct efi_cin_notify_function *item;
866 list_for_each_entry(item, &cin_notify_functions, link) {
869 /* We do not support toggle states */
870 if (item->key.key.unicode_char || item->key.key.scan_code) {
871 if (item->key.key.unicode_char !=
872 next_key.key.unicode_char ||
873 item->key.key.scan_code != next_key.key.scan_code)
876 if (item->key.key_state.key_shift_state &&
877 item->key.key_state.key_shift_state !=
878 next_key.key_state.key_shift_state)
882 /* We don't bother about the return code */
883 EFI_CALL(item->function(&next_key));
888 * efi_cin_check() - check if keyboard input is available
890 static void efi_cin_check(void)
895 efi_signal_event(efi_con_in.wait_for_key);
900 ret = efi_cin_read_key(&next_key);
901 if (ret == EFI_SUCCESS) {
902 key_available = true;
904 /* Notify registered functions */
907 /* Queue the wait for key event */
909 efi_signal_event(efi_con_in.wait_for_key);
915 * efi_cin_empty_buffer() - empty input buffer
917 static void efi_cin_empty_buffer(void)
921 key_available = false;
925 * efi_cin_reset_ex() - reset console input
927 * @this: - the extended simple text input protocol
928 * @extended_verification: - extended verification
930 * This function implements the reset service of the
931 * EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL.
933 * See the Unified Extensible Firmware Interface (UEFI) specification for
936 * Return: old value of the task priority level
938 static efi_status_t EFIAPI efi_cin_reset_ex(
939 struct efi_simple_text_input_ex_protocol *this,
940 bool extended_verification)
942 efi_status_t ret = EFI_SUCCESS;
944 EFI_ENTRY("%p, %d", this, extended_verification);
946 /* Check parameters */
948 ret = EFI_INVALID_PARAMETER;
952 efi_cin_empty_buffer();
954 return EFI_EXIT(ret);
958 * efi_cin_read_key_stroke_ex() - read key stroke
960 * @this: instance of the EFI_SIMPLE_TEXT_INPUT_PROTOCOL
961 * @key_data: key read from console
962 * Return: status code
964 * This function implements the ReadKeyStrokeEx service of the
965 * EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL.
967 * See the Unified Extensible Firmware Interface (UEFI) specification for
970 static efi_status_t EFIAPI efi_cin_read_key_stroke_ex(
971 struct efi_simple_text_input_ex_protocol *this,
972 struct efi_key_data *key_data)
974 efi_status_t ret = EFI_SUCCESS;
976 EFI_ENTRY("%p, %p", this, key_data);
978 /* Check parameters */
979 if (!this || !key_data) {
980 ret = EFI_INVALID_PARAMETER;
984 /* We don't do interrupts, so check for timers cooperatively */
987 /* Enable console input after ExitBootServices */
990 if (!key_available) {
991 memset(key_data, 0, sizeof(struct efi_key_data));
996 * CTRL+A - CTRL+Z have to be signaled as a - z.
997 * SHIFT+CTRL+A - SHIFT+CTRL+Z have to be signaled as A - Z.
998 * CTRL+\ - CTRL+_ have to be signaled as \ - _.
1000 switch (next_key.key.unicode_char) {
1004 if (!(next_key.key_state.key_toggle_state &
1005 EFI_CAPS_LOCK_ACTIVE) ^
1006 !(next_key.key_state.key_shift_state &
1007 (EFI_LEFT_SHIFT_PRESSED | EFI_RIGHT_SHIFT_PRESSED)))
1008 next_key.key.unicode_char += 0x40;
1010 next_key.key.unicode_char += 0x60;
1013 next_key.key.unicode_char += 0x40;
1015 *key_data = next_key;
1016 key_available = false;
1017 efi_con_in.wait_for_key->is_signaled = false;
1020 return EFI_EXIT(ret);
1024 * efi_cin_set_state() - set toggle key state
1026 * @this: instance of the EFI_SIMPLE_TEXT_INPUT_PROTOCOL
1027 * @key_toggle_state: pointer to key toggle state
1028 * Return: status code
1030 * This function implements the SetState service of the
1031 * EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL.
1033 * See the Unified Extensible Firmware Interface (UEFI) specification for
1036 static efi_status_t EFIAPI efi_cin_set_state(
1037 struct efi_simple_text_input_ex_protocol *this,
1038 u8 *key_toggle_state)
1040 EFI_ENTRY("%p, %p", this, key_toggle_state);
1042 * U-Boot supports multiple console input sources like serial and
1043 * net console for which a key toggle state cannot be set at all.
1045 * According to the UEFI specification it is allowable to not implement
1048 return EFI_EXIT(EFI_UNSUPPORTED);
1052 * efi_cin_register_key_notify() - register key notification function
1054 * @this: instance of the EFI_SIMPLE_TEXT_INPUT_PROTOCOL
1055 * @key_data: key to be notified
1056 * @key_notify_function: function to be called if the key is pressed
1057 * @notify_handle: handle for unregistering the notification
1058 * Return: status code
1060 * This function implements the SetState service of the
1061 * EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL.
1063 * See the Unified Extensible Firmware Interface (UEFI) specification for
1066 static efi_status_t EFIAPI efi_cin_register_key_notify(
1067 struct efi_simple_text_input_ex_protocol *this,
1068 struct efi_key_data *key_data,
1069 efi_status_t (EFIAPI *key_notify_function)(
1070 struct efi_key_data *key_data),
1071 void **notify_handle)
1073 efi_status_t ret = EFI_SUCCESS;
1074 struct efi_cin_notify_function *notify_function;
1076 EFI_ENTRY("%p, %p, %p, %p",
1077 this, key_data, key_notify_function, notify_handle);
1079 /* Check parameters */
1080 if (!this || !key_data || !key_notify_function || !notify_handle) {
1081 ret = EFI_INVALID_PARAMETER;
1085 EFI_PRINT("u+%04x, sc %04x, sh %08x, tg %02x\n",
1086 key_data->key.unicode_char,
1087 key_data->key.scan_code,
1088 key_data->key_state.key_shift_state,
1089 key_data->key_state.key_toggle_state);
1091 notify_function = calloc(1, sizeof(struct efi_cin_notify_function));
1092 if (!notify_function) {
1093 ret = EFI_OUT_OF_RESOURCES;
1096 notify_function->key = *key_data;
1097 notify_function->function = key_notify_function;
1098 list_add_tail(¬ify_function->link, &cin_notify_functions);
1099 *notify_handle = notify_function;
1101 return EFI_EXIT(ret);
1105 * efi_cin_unregister_key_notify() - unregister key notification function
1107 * @this: instance of the EFI_SIMPLE_TEXT_INPUT_PROTOCOL
1108 * @notification_handle: handle received when registering
1109 * Return: status code
1111 * This function implements the SetState service of the
1112 * EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL.
1114 * See the Unified Extensible Firmware Interface (UEFI) specification for
1117 static efi_status_t EFIAPI efi_cin_unregister_key_notify(
1118 struct efi_simple_text_input_ex_protocol *this,
1119 void *notification_handle)
1121 efi_status_t ret = EFI_INVALID_PARAMETER;
1122 struct efi_cin_notify_function *item, *notify_function =
1123 notification_handle;
1125 EFI_ENTRY("%p, %p", this, notification_handle);
1127 /* Check parameters */
1128 if (!this || !notification_handle)
1131 list_for_each_entry(item, &cin_notify_functions, link) {
1132 if (item == notify_function) {
1137 if (ret != EFI_SUCCESS)
1140 /* Remove the notify function */
1141 list_del(¬ify_function->link);
1142 free(notify_function);
1144 return EFI_EXIT(ret);
1149 * efi_cin_reset() - drain the input buffer
1151 * @this: instance of the EFI_SIMPLE_TEXT_INPUT_PROTOCOL
1152 * @extended_verification: allow for exhaustive verification
1153 * Return: status code
1155 * This function implements the Reset service of the
1156 * EFI_SIMPLE_TEXT_INPUT_PROTOCOL.
1158 * See the Unified Extensible Firmware Interface (UEFI) specification for
1161 static efi_status_t EFIAPI efi_cin_reset
1162 (struct efi_simple_text_input_protocol *this,
1163 bool extended_verification)
1165 efi_status_t ret = EFI_SUCCESS;
1167 EFI_ENTRY("%p, %d", this, extended_verification);
1169 /* Check parameters */
1171 ret = EFI_INVALID_PARAMETER;
1175 efi_cin_empty_buffer();
1177 return EFI_EXIT(ret);
1181 * efi_cin_read_key_stroke() - read key stroke
1183 * @this: instance of the EFI_SIMPLE_TEXT_INPUT_PROTOCOL
1184 * @key: key read from console
1185 * Return: status code
1187 * This function implements the ReadKeyStroke service of the
1188 * EFI_SIMPLE_TEXT_INPUT_PROTOCOL.
1190 * See the Unified Extensible Firmware Interface (UEFI) specification for
1193 static efi_status_t EFIAPI efi_cin_read_key_stroke
1194 (struct efi_simple_text_input_protocol *this,
1195 struct efi_input_key *key)
1197 efi_status_t ret = EFI_SUCCESS;
1199 EFI_ENTRY("%p, %p", this, key);
1201 /* Check parameters */
1202 if (!this || !key) {
1203 ret = EFI_INVALID_PARAMETER;
1207 /* We don't do interrupts, so check for timers cooperatively */
1210 /* Enable console input after ExitBootServices */
1213 if (!key_available) {
1214 ret = EFI_NOT_READY;
1217 *key = next_key.key;
1218 key_available = false;
1219 efi_con_in.wait_for_key->is_signaled = false;
1221 return EFI_EXIT(ret);
1224 static struct efi_simple_text_input_ex_protocol efi_con_in_ex = {
1225 .reset = efi_cin_reset_ex,
1226 .read_key_stroke_ex = efi_cin_read_key_stroke_ex,
1227 .wait_for_key_ex = NULL,
1228 .set_state = efi_cin_set_state,
1229 .register_key_notify = efi_cin_register_key_notify,
1230 .unregister_key_notify = efi_cin_unregister_key_notify,
1233 struct efi_simple_text_input_protocol efi_con_in = {
1234 .reset = efi_cin_reset,
1235 .read_key_stroke = efi_cin_read_key_stroke,
1236 .wait_for_key = NULL,
1239 static struct efi_event *console_timer_event;
1242 * efi_console_timer_notify() - notify the console timer event
1244 * @event: console timer event
1245 * @context: not used
1247 static void EFIAPI efi_console_timer_notify(struct efi_event *event,
1250 EFI_ENTRY("%p, %p", event, context);
1252 EFI_EXIT(EFI_SUCCESS);
1256 * efi_key_notify() - notify the wait for key event
1258 * @event: wait for key event
1259 * @context: not used
1261 static void EFIAPI efi_key_notify(struct efi_event *event, void *context)
1263 EFI_ENTRY("%p, %p", event, context);
1265 EFI_EXIT(EFI_SUCCESS);
1269 * efi_console_register() - install the console protocols
1271 * This function is called from do_bootefi_exec().
1273 * Return: status code
1275 efi_status_t efi_console_register(void)
1278 struct efi_device_path *dp;
1280 /* Install protocols on root node */
1281 r = efi_install_multiple_protocol_interfaces(&efi_root,
1282 &efi_guid_text_output_protocol,
1284 &efi_guid_text_input_protocol,
1286 &efi_guid_text_input_ex_protocol,
1290 /* Create console node and install device path protocols */
1291 if (CONFIG_IS_ENABLED(DM_SERIAL)) {
1292 dp = efi_dp_from_uart();
1296 /* Hook UART up to the device list */
1297 efi_add_handle(&uart_obj);
1299 /* Install device path */
1300 r = efi_add_protocol(&uart_obj, &efi_guid_device_path, dp);
1301 if (r != EFI_SUCCESS)
1305 /* Create console events */
1306 r = efi_create_event(EVT_NOTIFY_WAIT, TPL_CALLBACK, efi_key_notify,
1307 NULL, NULL, &efi_con_in.wait_for_key);
1308 if (r != EFI_SUCCESS) {
1309 printf("ERROR: Failed to register WaitForKey event\n");
1312 efi_con_in_ex.wait_for_key_ex = efi_con_in.wait_for_key;
1313 r = efi_create_event(EVT_TIMER | EVT_NOTIFY_SIGNAL, TPL_CALLBACK,
1314 efi_console_timer_notify, NULL, NULL,
1315 &console_timer_event);
1316 if (r != EFI_SUCCESS) {
1317 printf("ERROR: Failed to register console event\n");
1320 /* 5000 ns cycle is sufficient for 2 MBaud */
1321 r = efi_set_timer(console_timer_event, EFI_TIMER_PERIODIC, 50);
1322 if (r != EFI_SUCCESS)
1323 printf("ERROR: Failed to set console timer\n");
1326 printf("ERROR: Out of memory\n");
1331 * efi_console_get_u16_string() - get user input string
1333 * @cin: protocol interface to EFI_SIMPLE_TEXT_INPUT_PROTOCOL
1334 * @buf: buffer to store user input string in UTF16
1335 * @count: number of u16 string including NULL terminator that buf has
1336 * @filter_func: callback to filter user input
1337 * @row: row number to locate user input form
1338 * @col: column number to locate user input form
1339 * Return: status code
1341 efi_status_t efi_console_get_u16_string(struct efi_simple_text_input_protocol *cin,
1342 u16 *buf, efi_uintn_t count,
1343 efi_console_filter_func filter_func,
1347 efi_uintn_t len = 0;
1348 struct efi_input_key key;
1350 printf(ANSI_CURSOR_POSITION
1351 ANSI_CLEAR_LINE_TO_END
1352 ANSI_CURSOR_SHOW, row, col);
1354 ret = EFI_CALL(cin->reset(cin, false));
1355 if (ret != EFI_SUCCESS)
1360 ret = EFI_CALL(cin->read_key_stroke(cin, &key));
1362 } while (ret == EFI_NOT_READY);
1364 if (key.unicode_char == u'\b') {
1368 printf(ANSI_CURSOR_POSITION
1370 ANSI_CLEAR_LINE_TO_END, row, col, buf);
1372 } else if (key.unicode_char == u'\r') {
1375 } else if (key.unicode_char == 0x3 || key.scan_code == 23) {
1377 } else if (key.unicode_char < 0x20) {
1378 /* ignore control codes other than Ctrl+C, '\r' and '\b' */
1380 } else if (key.scan_code != 0) {
1381 /* only accept single ESC press for cancel */
1386 if (filter_func(&key) != EFI_SUCCESS)
1390 if (len >= (count - 1))
1393 buf[len] = key.unicode_char;
1395 printf(ANSI_CURSOR_POSITION "%ls", row, col, buf);