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efi_console.c
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efi_console.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* EFI application console interface
*
* Copyright (c) 2016 Alexander Graf
*/
#define LOG_CATEGORY LOGC_EFI
#include <ansi.h>
#include <charset.h>
#include <malloc.h>
#include <time.h>
#include <dm/device.h>
#include <efi_loader.h>
#include <env.h>
#include <log.h>
#include <stdio_dev.h>
#include <video_console.h>
#include <linux/delay.h>
#define EFI_COUT_MODE_2 2
#define EFI_MAX_COUT_MODE 3
struct cout_mode {
unsigned long columns;
unsigned long rows;
int present;
};
__maybe_unused static struct efi_object uart_obj;
static struct cout_mode efi_cout_modes[] = {
/* EFI Mode 0 is 80x25 and always present */
{
.columns = 80,
.rows = 25,
.present = 1,
},
/* EFI Mode 1 is always 80x50 */
{
.columns = 80,
.rows = 50,
.present = 0,
},
/* Value are unknown until we query the console */
{
.columns = 0,
.rows = 0,
.present = 0,
},
};
const efi_guid_t efi_guid_text_input_ex_protocol =
EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL_GUID;
const efi_guid_t efi_guid_text_input_protocol =
EFI_SIMPLE_TEXT_INPUT_PROTOCOL_GUID;
const efi_guid_t efi_guid_text_output_protocol =
EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL_GUID;
#define cESC '\x1b'
#define ESC "\x1b"
/*
* efi_con_mode - mode information of the Simple Text Output Protocol
*
* Use safe settings before efi_setup_console_size() is called.
* By default enable only the 80x25 mode which must always exist.
*/
static struct simple_text_output_mode efi_con_mode = {
.max_mode = 1,
.mode = 0,
.attribute = 0,
.cursor_column = 0,
.cursor_row = 0,
.cursor_visible = 1,
};
/**
* term_get_char() - read a character from the console
*
* Wait for up to 100 ms to read a character from the console.
*
* @c: pointer to the buffer to receive the character
* Return: 0 on success, 1 otherwise
*/
static int term_get_char(s32 *c)
{
u64 timeout;
/* Wait up to 100 ms for a character */
timeout = timer_get_us() + 100000;
while (!tstc())
if (timer_get_us() > timeout)
return 1;
*c = getchar();
return 0;
}
/**
* Receive and parse a reply from the terminal.
*
* @n: array of return values
* @num: number of return values expected
* @end_char: character indicating end of terminal message
* Return: non-zero indicates error
*/
static int term_read_reply(int *n, int num, char end_char)
{
s32 c;
int i = 0;
if (term_get_char(&c) || c != cESC)
return -1;
if (term_get_char(&c) || c != '[')
return -1;
n[0] = 0;
while (1) {
if (!term_get_char(&c)) {
if (c == ';') {
i++;
if (i >= num)
return -1;
n[i] = 0;
continue;
} else if (c == end_char) {
break;
} else if (c > '9' || c < '0') {
return -1;
}
/* Read one more decimal position */
n[i] *= 10;
n[i] += c - '0';
} else {
return -1;
}
}
if (i != num - 1)
return -1;
return 0;
}
/**
* efi_cout_output_string() - write Unicode string to console
*
* This function implements the OutputString service of the simple text output
* protocol. See the Unified Extensible Firmware Interface (UEFI) specification
* for details.
*
* @this: simple text output protocol
* @string: u16 string
* Return: status code
*/
static efi_status_t EFIAPI efi_cout_output_string(
struct efi_simple_text_output_protocol *this,
const u16 *string)
{
struct simple_text_output_mode *con = &efi_con_mode;
struct cout_mode *mode = &efi_cout_modes[con->mode];
char *buf, *pos;
const u16 *p;
efi_status_t ret = EFI_SUCCESS;
EFI_ENTRY("%p, %p", this, string);
if (!this || !string) {
ret = EFI_INVALID_PARAMETER;
goto out;
}
buf = malloc(utf16_utf8_strlen(string) + 1);
if (!buf) {
ret = EFI_OUT_OF_RESOURCES;
goto out;
}
pos = buf;
utf16_utf8_strcpy(&pos, string);
fputs(stdout, buf);
free(buf);
/*
* Update the cursor position.
*
* The UEFI spec provides advance rules for U+0000, U+0008, U+000A,
* and U000D. All other control characters are ignored. Any non-control
* character increase the column by one.
*/
for (p = string; *p; ++p) {
switch (*p) {
case '\b': /* U+0008, backspace */
if (con->cursor_column)
con->cursor_column--;
break;
case '\n': /* U+000A, newline */
con->cursor_column = 0;
con->cursor_row++;
break;
case '\r': /* U+000D, carriage-return */
con->cursor_column = 0;
break;
case 0xd800 ... 0xdbff:
/*
* Ignore high surrogates, we do not want to count a
* Unicode character twice.
*/
break;
default:
/* Exclude control codes */
if (*p > 0x1f)
con->cursor_column++;
break;
}
if (con->cursor_column >= mode->columns) {
con->cursor_column = 0;
con->cursor_row++;
}
/*
* When we exceed the row count the terminal will scroll up one
* line. We have to adjust the cursor position.
*/
if (con->cursor_row >= mode->rows && con->cursor_row)
con->cursor_row--;
}
out:
return EFI_EXIT(ret);
}
/**
* efi_cout_test_string() - test writing Unicode string to console
*
* This function implements the TestString service of the simple text output
* protocol. See the Unified Extensible Firmware Interface (UEFI) specification
* for details.
*
* As in OutputString we simply convert UTF-16 to UTF-8 there are no unsupported
* code points and we can always return EFI_SUCCESS.
*
* @this: simple text output protocol
* @string: u16 string
* Return: status code
*/
static efi_status_t EFIAPI efi_cout_test_string(
struct efi_simple_text_output_protocol *this,
const u16 *string)
{
EFI_ENTRY("%p, %p", this, string);
return EFI_EXIT(EFI_SUCCESS);
}
/**
* cout_mode_matches() - check if mode has given terminal size
*
* @mode: text mode
* @rows: number of rows
* @cols: number of columns
* Return: true if number of rows and columns matches the mode and
* the mode is present
*/
static bool cout_mode_matches(struct cout_mode *mode, int rows, int cols)
{
if (!mode->present)
return false;
return (mode->rows == rows) && (mode->columns == cols);
}
/**
* query_console_serial() - query serial console size
*
* When using a serial console or the net console we can only devise the
* terminal size by querying the terminal using ECMA-48 control sequences.
*
* @rows: pointer to return number of rows
* @cols: pointer to return number of columns
* Returns: 0 on success
*/
static int query_console_serial(int *rows, int *cols)
{
int ret = 0;
int n[2];
/* Empty input buffer */
while (tstc())
getchar();
/*
* Not all terminals understand CSI [18t for querying the console size.
* We should adhere to escape sequences documented in the console_codes
* man page and the ECMA-48 standard.
*
* So here we follow a different approach. We position the cursor to the
* bottom right and query its position. Before leaving the function we
* restore the original cursor position.
*/
printf(ESC "7" /* Save cursor position */
ESC "[r" /* Set scrolling region to full window */
ESC "[999;999H" /* Move to bottom right corner */
ESC "[6n"); /* Query cursor position */
/* Read {rows,cols} */
if (term_read_reply(n, 2, 'R')) {
ret = 1;
goto out;
}
*cols = n[1];
*rows = n[0];
out:
printf(ESC "8"); /* Restore cursor position */
return ret;
}
/**
* query_vidconsole() - query video console size
*
*
* @rows: pointer to return number of rows
* @cols: pointer to return number of columns
* Returns: 0 on success
*/
static int __maybe_unused query_vidconsole(int *rows, int *cols)
{
const char *stdout_name = env_get("stdout");
struct stdio_dev *stdout_dev;
struct udevice *dev;
struct vidconsole_priv *priv;
if (!stdout_name || strncmp(stdout_name, "vidconsole", 10))
return -ENODEV;
stdout_dev = stdio_get_by_name("vidconsole");
if (!stdout_dev)
return -ENODEV;
dev = stdout_dev->priv;
if (!dev)
return -ENODEV;
priv = dev_get_uclass_priv(dev);
if (!priv)
return -ENODEV;
*rows = priv->rows;
*cols = priv->cols;
return 0;
}
/**
* efi_setup_console_size() - update the mode table.
*
* By default the only mode available is 80x25. If the console has at least 50
* lines, enable mode 80x50. If we can query the console size and it is neither
* 80x25 nor 80x50, set it as an additional mode.
*/
void efi_setup_console_size(void)
{
int rows = 25, cols = 80;
int ret = -ENODEV;
if (IS_ENABLED(CONFIG_VIDEO))
ret = query_vidconsole(&rows, &cols);
if (ret)
ret = query_console_serial(&rows, &cols);
if (ret)
return;
log_debug("Console size %dx%d\n", rows, cols);
/* Test if we can have Mode 1 */
if (cols >= 80 && rows >= 50) {
efi_cout_modes[1].present = 1;
efi_con_mode.max_mode = 2;
}
/*
* Install our mode as mode 2 if it is different
* than mode 0 or 1 and set it as the currently selected mode
*/
if (!cout_mode_matches(&efi_cout_modes[0], rows, cols) &&
!cout_mode_matches(&efi_cout_modes[1], rows, cols)) {
efi_cout_modes[EFI_COUT_MODE_2].columns = cols;
efi_cout_modes[EFI_COUT_MODE_2].rows = rows;
efi_cout_modes[EFI_COUT_MODE_2].present = 1;
efi_con_mode.max_mode = EFI_MAX_COUT_MODE;
efi_con_mode.mode = EFI_COUT_MODE_2;
}
}
/**
* efi_cout_query_mode() - get terminal size for a text mode
*
* This function implements the QueryMode service of the simple text output
* protocol. See the Unified Extensible Firmware Interface (UEFI) specification
* for details.
*
* @this: simple text output protocol
* @mode_number: mode number to retrieve information on
* @columns: number of columns
* @rows: number of rows
* Return: status code
*/
static efi_status_t EFIAPI efi_cout_query_mode(
struct efi_simple_text_output_protocol *this,
unsigned long mode_number, unsigned long *columns,
unsigned long *rows)
{
EFI_ENTRY("%p, %ld, %p, %p", this, mode_number, columns, rows);
if (mode_number >= efi_con_mode.max_mode)
return EFI_EXIT(EFI_UNSUPPORTED);
if (efi_cout_modes[mode_number].present != 1)
return EFI_EXIT(EFI_UNSUPPORTED);
if (columns)
*columns = efi_cout_modes[mode_number].columns;
if (rows)
*rows = efi_cout_modes[mode_number].rows;
return EFI_EXIT(EFI_SUCCESS);
}
static const struct {
unsigned int fg;
unsigned int bg;
} color[] = {
{ 30, 40 }, /* 0: black */
{ 34, 44 }, /* 1: blue */
{ 32, 42 }, /* 2: green */
{ 36, 46 }, /* 3: cyan */
{ 31, 41 }, /* 4: red */
{ 35, 45 }, /* 5: magenta */
{ 33, 43 }, /* 6: brown, map to yellow as EDK2 does*/
{ 37, 47 }, /* 7: light gray, map to white */
};
/**
* efi_cout_set_attribute() - set fore- and background color
*
* This function implements the SetAttribute service of the simple text output
* protocol. See the Unified Extensible Firmware Interface (UEFI) specification
* for details.
*
* @this: simple text output protocol
* @attribute: foreground color - bits 0-3, background color - bits 4-6
* Return: status code
*/
static efi_status_t EFIAPI efi_cout_set_attribute(
struct efi_simple_text_output_protocol *this,
unsigned long attribute)
{
unsigned int bold = EFI_ATTR_BOLD(attribute);
unsigned int fg = EFI_ATTR_FG(attribute);
unsigned int bg = EFI_ATTR_BG(attribute);
EFI_ENTRY("%p, %lx", this, attribute);
efi_con_mode.attribute = attribute;
if (attribute)
printf(ESC"[%u;%u;%um", bold, color[fg].fg, color[bg].bg);
else
printf(ESC"[0;37;40m");
return EFI_EXIT(EFI_SUCCESS);
}
/**
* efi_clear_screen() - clear screen
*/
static void efi_clear_screen(void)
{
if (CONFIG_IS_ENABLED(EFI_SCROLL_ON_CLEAR_SCREEN)) {
unsigned int row, screen_rows, screen_columns;
/* Avoid overwriting previous outputs on streaming consoles */
screen_rows = efi_cout_modes[efi_con_mode.mode].rows;
screen_columns = efi_cout_modes[efi_con_mode.mode].columns;
printf(ESC "[%u;%uH", screen_rows, screen_columns);
for (row = 1; row < screen_rows; row++)
printf("\n");
}
/*
* The Linux console wants both a clear and a home command. The video
* uclass does not support <ESC>[H without coordinates, yet.
*/
printf(ESC "[2J" ESC "[1;1H");
efi_con_mode.cursor_column = 0;
efi_con_mode.cursor_row = 0;
}
/**
* efi_cout_clear_screen() - clear screen
*
* This function implements the ClearScreen service of the simple text output
* protocol. See the Unified Extensible Firmware Interface (UEFI) specification
* for details.
*
* @this: pointer to the protocol instance
* Return: status code
*/
static efi_status_t EFIAPI efi_cout_clear_screen(
struct efi_simple_text_output_protocol *this)
{
EFI_ENTRY("%p", this);
/* Set default colors if not done yet */
if (efi_con_mode.attribute == 0) {
efi_con_mode.attribute = 0x07;
printf(ESC "[0;37;40m");
}
efi_clear_screen();
return EFI_EXIT(EFI_SUCCESS);
}
/**
* efi_cout_clear_set_mode() - set text model
*
* This function implements the SetMode service of the simple text output
* protocol. See the Unified Extensible Firmware Interface (UEFI) specification
* for details.
*
* @this: pointer to the protocol instance
* @mode_number: number of the text mode to set
* Return: status code
*/
static efi_status_t EFIAPI efi_cout_set_mode(
struct efi_simple_text_output_protocol *this,
unsigned long mode_number)
{
EFI_ENTRY("%p, %ld", this, mode_number);
if (mode_number >= efi_con_mode.max_mode)
return EFI_EXIT(EFI_UNSUPPORTED);
if (!efi_cout_modes[mode_number].present)
return EFI_EXIT(EFI_UNSUPPORTED);
efi_con_mode.mode = mode_number;
efi_clear_screen();
return EFI_EXIT(EFI_SUCCESS);
}
/**
* efi_cout_reset() - reset the terminal
*
* This function implements the Reset service of the simple text output
* protocol. See the Unified Extensible Firmware Interface (UEFI) specification
* for details.
*
* @this: pointer to the protocol instance
* @extended_verification: if set an extended verification may be executed
* Return: status code
*/
static efi_status_t EFIAPI efi_cout_reset(
struct efi_simple_text_output_protocol *this,
char extended_verification)
{
EFI_ENTRY("%p, %d", this, extended_verification);
/* Set default colors */
efi_con_mode.attribute = 0x07;
printf(ESC "[0;37;40m");
/* Clear screen */
efi_clear_screen();
return EFI_EXIT(EFI_SUCCESS);
}
/**
* efi_cout_set_cursor_position() - reset the terminal
*
* This function implements the SetCursorPosition service of the simple text
* output protocol. See the Unified Extensible Firmware Interface (UEFI)
* specification for details.
*
* @this: pointer to the protocol instance
* @column: column to move to
* @row: row to move to
* Return: status code
*/
static efi_status_t EFIAPI efi_cout_set_cursor_position(
struct efi_simple_text_output_protocol *this,
unsigned long column, unsigned long row)
{
efi_status_t ret = EFI_SUCCESS;
struct simple_text_output_mode *con = &efi_con_mode;
struct cout_mode *mode = &efi_cout_modes[con->mode];
EFI_ENTRY("%p, %ld, %ld", this, column, row);
/* Check parameters */
if (!this) {
ret = EFI_INVALID_PARAMETER;
goto out;
}
if (row >= mode->rows || column >= mode->columns) {
ret = EFI_UNSUPPORTED;
goto out;
}
/*
* Set cursor position by sending CSI H.
* EFI origin is [0, 0], terminal origin is [1, 1].
*/
printf(ESC "[%d;%dH", (int)row + 1, (int)column + 1);
efi_con_mode.cursor_column = column;
efi_con_mode.cursor_row = row;
out:
return EFI_EXIT(ret);
}
/**
* efi_cout_enable_cursor() - enable the cursor
*
* This function implements the EnableCursor service of the simple text output
* protocol. See the Unified Extensible Firmware Interface (UEFI) specification
* for details.
*
* @this: pointer to the protocol instance
* @enable: if true enable, if false disable the cursor
* Return: status code
*/
static efi_status_t EFIAPI efi_cout_enable_cursor(
struct efi_simple_text_output_protocol *this,
bool enable)
{
EFI_ENTRY("%p, %d", this, enable);
printf(ESC"[?25%c", enable ? 'h' : 'l');
efi_con_mode.cursor_visible = !!enable;
return EFI_EXIT(EFI_SUCCESS);
}
struct efi_simple_text_output_protocol efi_con_out = {
.reset = efi_cout_reset,
.output_string = efi_cout_output_string,
.test_string = efi_cout_test_string,
.query_mode = efi_cout_query_mode,
.set_mode = efi_cout_set_mode,
.set_attribute = efi_cout_set_attribute,
.clear_screen = efi_cout_clear_screen,
.set_cursor_position = efi_cout_set_cursor_position,
.enable_cursor = efi_cout_enable_cursor,
.mode = (void*)&efi_con_mode,
};
/**
* struct efi_cin_notify_function - registered console input notify function
*
* @link: link to list
* @key: key to notify
* @function: function to call
*/
struct efi_cin_notify_function {
struct list_head link;
struct efi_key_data key;
efi_status_t (EFIAPI *function)
(struct efi_key_data *key_data);
};
static bool key_available;
static struct efi_key_data next_key;
static LIST_HEAD(cin_notify_functions);
/**
* set_shift_mask() - set shift mask
*
* @mod: Xterm shift mask
* @key_state: receives the state of the shift, alt, control, and logo keys
*/
static void set_shift_mask(int mod, struct efi_key_state *key_state)
{
key_state->key_shift_state = EFI_SHIFT_STATE_VALID;
if (mod) {
--mod;
if (mod & 1)
key_state->key_shift_state |= EFI_LEFT_SHIFT_PRESSED;
if (mod & 2)
key_state->key_shift_state |= EFI_LEFT_ALT_PRESSED;
if (mod & 4)
key_state->key_shift_state |= EFI_LEFT_CONTROL_PRESSED;
if (!mod || (mod & 8))
key_state->key_shift_state |= EFI_LEFT_LOGO_PRESSED;
}
}
/**
* analyze_modifiers() - analyze modifiers (shift, alt, ctrl) for function keys
*
* This gets called when we have already parsed CSI.
*
* @key_state: receives the state of the shift, alt, control, and logo keys
* Return: the unmodified code
*/
static int analyze_modifiers(struct efi_key_state *key_state)
{
int c, mod = 0, ret = 0;
c = getchar();
if (c != ';') {
ret = c;
if (c == '~')
goto out;
c = getchar();
}
for (;;) {
switch (c) {
case '0'...'9':
mod *= 10;
mod += c - '0';
/* fall through */
case ';':
c = getchar();
break;
default:
goto out;
}
}
out:
set_shift_mask(mod, key_state);
if (!ret)
ret = c;
return ret;
}
/**
* efi_cin_read_key() - read a key from the console input
*
* @key: - key received
* Return: - status code
*/
static efi_status_t efi_cin_read_key(struct efi_key_data *key)
{
struct efi_input_key pressed_key = {
.scan_code = 0,
.unicode_char = 0,
};
s32 ch;
if (console_read_unicode(&ch))
return EFI_NOT_READY;
key->key_state.key_shift_state = EFI_SHIFT_STATE_INVALID;
key->key_state.key_toggle_state = EFI_TOGGLE_STATE_INVALID;
/* We do not support multi-word codes */
if (ch >= 0x10000)
ch = '?';
switch (ch) {
case 0x1b:
/*
* If a second key is received within 10 ms, assume that we are
* dealing with an escape sequence. Otherwise consider this the
* escape key being hit. 10 ms is long enough to work fine at
* 1200 baud and above.
*/
udelay(10000);
if (!tstc()) {
pressed_key.scan_code = 23;
break;
}
/*
* Xterm Control Sequences
* https://www.xfree86.org/4.8.0/ctlseqs.html
*/
ch = getchar();
switch (ch) {
case cESC: /* ESC */
pressed_key.scan_code = 23;
break;
case 'O': /* F1 - F4, End */
ch = getchar();
/* consider modifiers */
if (ch == 'F') { /* End */
pressed_key.scan_code = 6;
break;
} else if (ch < 'P') {
set_shift_mask(ch - '0', &key->key_state);
ch = getchar();
}
pressed_key.scan_code = ch - 'P' + 11;
break;
case '[':
ch = getchar();
switch (ch) {
case 'A'...'D': /* up, down right, left */
pressed_key.scan_code = ch - 'A' + 1;
break;
case 'F': /* End */
pressed_key.scan_code = 6;
break;
case 'H': /* Home */
pressed_key.scan_code = 5;
break;
case '1':
ch = analyze_modifiers(&key->key_state);
switch (ch) {
case '1'...'5': /* F1 - F5 */
pressed_key.scan_code = ch - '1' + 11;
break;
case '6'...'9': /* F5 - F8 */
pressed_key.scan_code = ch - '6' + 15;
break;
case 'A'...'D': /* up, down right, left */
pressed_key.scan_code = ch - 'A' + 1;
break;
case 'F': /* End */
pressed_key.scan_code = 6;
break;
case 'H': /* Home */
pressed_key.scan_code = 5;
break;
case '~': /* Home */
pressed_key.scan_code = 5;
break;
}
break;
case '2':
ch = analyze_modifiers(&key->key_state);
switch (ch) {
case '0'...'1': /* F9 - F10 */
pressed_key.scan_code = ch - '0' + 19;
break;
case '3'...'4': /* F11 - F12 */
pressed_key.scan_code = ch - '3' + 21;
break;
case '~': /* INS */
pressed_key.scan_code = 7;
break;
}
break;
case '3': /* DEL */
pressed_key.scan_code = 8;
analyze_modifiers(&key->key_state);
break;
case '5': /* PG UP */
pressed_key.scan_code = 9;
analyze_modifiers(&key->key_state);
break;
case '6': /* PG DOWN */
pressed_key.scan_code = 10;
analyze_modifiers(&key->key_state);
break;
} /* [ */
break;
default:
/* ALT key */
set_shift_mask(3, &key->key_state);
}
break;
case 0x7f:
/* Backspace */
ch = 0x08;
}
if (pressed_key.scan_code) {
key->key_state.key_shift_state |= EFI_SHIFT_STATE_VALID;
} else {
pressed_key.unicode_char = ch;
/*
* Assume left control key for control characters typically
* entered using the control key.
*/
if (ch >= 0x01 && ch <= 0x1f) {
key->key_state.key_shift_state |=
EFI_SHIFT_STATE_VALID;
switch (ch) {
case 0x01 ... 0x07:
case 0x0b ... 0x0c:
case 0x0e ... 0x1f:
key->key_state.key_shift_state |=
EFI_LEFT_CONTROL_PRESSED;
}
}
}
key->key = pressed_key;
return EFI_SUCCESS;
}
/**
* efi_cin_notify() - notify registered functions
*/
static void efi_cin_notify(void)
{
struct efi_cin_notify_function *item;
list_for_each_entry(item, &cin_notify_functions, link) {
bool match = true;
/* We do not support toggle states */
if (item->key.key.unicode_char || item->key.key.scan_code) {
if (item->key.key.unicode_char !=
next_key.key.unicode_char ||
item->key.key.scan_code != next_key.key.scan_code)
match = false;
}
if (item->key.key_state.key_shift_state &&
item->key.key_state.key_shift_state !=
next_key.key_state.key_shift_state)
match = false;
if (match)
/* We don't bother about the return code */
EFI_CALL(item->function(&next_key));
}
}
/**
* efi_cin_check() - check if keyboard input is available
*/
static void efi_cin_check(void)
{
efi_status_t ret;
if (key_available) {
efi_signal_event(efi_con_in.wait_for_key);
return;
}
if (tstc()) {
ret = efi_cin_read_key(&next_key);
if (ret == EFI_SUCCESS) {
key_available = true;
/* Notify registered functions */
efi_cin_notify();
/* Queue the wait for key event */
if (key_available)
efi_signal_event(efi_con_in.wait_for_key);
}
}
}
/**
* efi_cin_empty_buffer() - empty input buffer
*/
static void efi_cin_empty_buffer(void)
{
while (tstc())
getchar();
key_available = false;
}
/**
* efi_cin_reset_ex() - reset console input
*
* @this: - the extended simple text input protocol
* @extended_verification: - extended verification
*
* This function implements the reset service of the
* EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL.
*
* See the Unified Extensible Firmware Interface (UEFI) specification for
* details.
*
* Return: old value of the task priority level
*/
static efi_status_t EFIAPI efi_cin_reset_ex(
struct efi_simple_text_input_ex_protocol *this,
bool extended_verification)
{
efi_status_t ret = EFI_SUCCESS;
EFI_ENTRY("%p, %d", this, extended_verification);
/* Check parameters */
if (!this) {
ret = EFI_INVALID_PARAMETER;
goto out;
}
efi_cin_empty_buffer();
out:
return EFI_EXIT(ret);
}
/**
* efi_cin_read_key_stroke_ex() - read key stroke
*
* @this: instance of the EFI_SIMPLE_TEXT_INPUT_PROTOCOL
* @key_data: key read from console
* Return: status code
*
* This function implements the ReadKeyStrokeEx service of the
* EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL.
*
* See the Unified Extensible Firmware Interface (UEFI) specification for
* details.