u-boot/lib/efi_loader/efi_console.c
Emmanuel Vadot 5be8b0a338 efi_loader: console: Correctly report modes
Add support for EFI console modes.
Mode 0 is always 80x25 and present by EFI specification.
Mode 1 is always 80x50 and not mandatory.
Mode 2 and above is freely usable.

If the terminal can handle mode 1, we mark it as supported.
If the terminal size is greater than mode 0 and different than mode 1,
we install it as mode 2.

Modes can be switch with cout_set_mode.

Changes in V5:
 Correctly detect mode before enabling mode 2.

Changes in V4:
 Reset cursor positon on mode switch
 Use local variables in console query code

Changes in V3:
 Valid mode are 0 to EFIMode-1
 Fix style

Changes in V2:
 Add mode switch
 Report only the modes that we support

Signed-off-by: Emmanuel Vadot <manu@bidouilliste.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
2016-11-14 23:24:02 +01:00

428 lines
9.1 KiB
C

/*
* EFI application console interface
*
* Copyright (c) 2016 Alexander Graf
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <efi_loader.h>
static bool console_size_queried;
#define EFI_COUT_MODE_2 2
#define EFI_MAX_COUT_MODE 3
struct cout_mode {
unsigned long columns;
unsigned long rows;
int present;
};
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_console_control = CONSOLE_CONTROL_GUID;
#define cESC '\x1b'
#define ESC "\x1b"
static efi_status_t EFIAPI efi_cin_get_mode(
struct efi_console_control_protocol *this,
int *mode, char *uga_exists, char *std_in_locked)
{
EFI_ENTRY("%p, %p, %p, %p", this, mode, uga_exists, std_in_locked);
if (mode)
*mode = EFI_CONSOLE_MODE_TEXT;
if (uga_exists)
*uga_exists = 0;
if (std_in_locked)
*std_in_locked = 0;
return EFI_EXIT(EFI_SUCCESS);
}
static efi_status_t EFIAPI efi_cin_set_mode(
struct efi_console_control_protocol *this, int mode)
{
EFI_ENTRY("%p, %d", this, mode);
return EFI_EXIT(EFI_UNSUPPORTED);
}
static efi_status_t EFIAPI efi_cin_lock_std_in(
struct efi_console_control_protocol *this,
uint16_t *password)
{
EFI_ENTRY("%p, %p", this, password);
return EFI_EXIT(EFI_UNSUPPORTED);
}
const struct efi_console_control_protocol efi_console_control = {
.get_mode = efi_cin_get_mode,
.set_mode = efi_cin_set_mode,
.lock_std_in = efi_cin_lock_std_in,
};
/* Default to mode 0 */
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,
};
static int term_read_reply(int *n, int maxnum, char end_char)
{
char c;
int i = 0;
c = getc();
if (c != cESC)
return -1;
c = getc();
if (c != '[')
return -1;
n[0] = 0;
while (1) {
c = getc();
if (c == ';') {
i++;
if (i >= maxnum)
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';
}
return 0;
}
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);
return EFI_EXIT(EFI_UNSUPPORTED);
}
static void print_unicode_in_utf8(u16 c)
{
char utf8[4] = { 0 };
char *b = utf8;
if (c < 0x80) {
*(b++) = c;
} else if (c < 0x800) {
*(b++) = 192 + c / 64;
*(b++) = 128 + c % 64;
} else {
*(b++) = 224 + c / 4096;
*(b++) = 128 + c / 64 % 64;
*(b++) = 128 + c % 64;
}
puts(utf8);
}
static efi_status_t EFIAPI efi_cout_output_string(
struct efi_simple_text_output_protocol *this,
const unsigned short *string)
{
struct cout_mode *mode;
u16 ch;
mode = &efi_cout_modes[efi_con_mode.mode];
EFI_ENTRY("%p, %p", this, string);
for (;(ch = *string); string++) {
print_unicode_in_utf8(ch);
efi_con_mode.cursor_column++;
if (ch == '\n') {
efi_con_mode.cursor_column = 1;
efi_con_mode.cursor_row++;
} else if (efi_con_mode.cursor_column > mode->columns) {
efi_con_mode.cursor_column = 1;
efi_con_mode.cursor_row++;
}
if (efi_con_mode.cursor_row > mode->rows)
efi_con_mode.cursor_row = mode->rows;
}
return EFI_EXIT(EFI_SUCCESS);
}
static efi_status_t EFIAPI efi_cout_test_string(
struct efi_simple_text_output_protocol *this,
const unsigned short *string)
{
EFI_ENTRY("%p, %p", this, string);
return EFI_EXIT(EFI_SUCCESS);
}
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);
}
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 (!console_size_queried) {
/* Ask the terminal about its size */
int n[3];
int cols;
int rows;
u64 timeout;
console_size_queried = true;
/* Empty input buffer */
while (tstc())
getc();
printf(ESC"[18t");
/* Check if we have a terminal that understands */
timeout = timer_get_us() + 1000000;
while (!tstc())
if (timer_get_us() > timeout)
goto out;
/* Read {depth,rows,cols} */
if (term_read_reply(n, 3, 't')) {
goto out;
}
cols = n[2];
rows = n[1];
/* 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;
}
}
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);
out:
if (columns)
*columns = efi_cout_modes[mode_number].columns;
if (rows)
*rows = efi_cout_modes[mode_number].rows;
return EFI_EXIT(EFI_SUCCESS);
}
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);
efi_con_mode.mode = mode_number;
efi_con_mode.cursor_column = 0;
efi_con_mode.cursor_row = 0;
return EFI_EXIT(EFI_SUCCESS);
}
static efi_status_t EFIAPI efi_cout_set_attribute(
struct efi_simple_text_output_protocol *this,
unsigned long attribute)
{
EFI_ENTRY("%p, %lx", this, attribute);
/* Just ignore attributes (colors) for now */
return EFI_EXIT(EFI_UNSUPPORTED);
}
static efi_status_t EFIAPI efi_cout_clear_screen(
struct efi_simple_text_output_protocol *this)
{
EFI_ENTRY("%p", this);
printf(ESC"[2J");
return EFI_EXIT(EFI_SUCCESS);
}
static efi_status_t EFIAPI efi_cout_set_cursor_position(
struct efi_simple_text_output_protocol *this,
unsigned long column, unsigned long row)
{
EFI_ENTRY("%p, %ld, %ld", this, column, row);
printf(ESC"[%d;%df", (int)row, (int)column);
efi_con_mode.cursor_column = column;
efi_con_mode.cursor_row = row;
return EFI_EXIT(EFI_SUCCESS);
}
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');
return EFI_EXIT(EFI_SUCCESS);
}
const 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,
};
static efi_status_t EFIAPI efi_cin_reset(
struct efi_simple_input_interface *this,
bool extended_verification)
{
EFI_ENTRY("%p, %d", this, extended_verification);
return EFI_EXIT(EFI_UNSUPPORTED);
}
static efi_status_t EFIAPI efi_cin_read_key_stroke(
struct efi_simple_input_interface *this,
struct efi_input_key *key)
{
struct efi_input_key pressed_key = {
.scan_code = 0,
.unicode_char = 0,
};
char ch;
EFI_ENTRY("%p, %p", this, key);
/* We don't do interrupts, so check for timers cooperatively */
efi_timer_check();
if (!tstc()) {
/* No key pressed */
return EFI_EXIT(EFI_NOT_READY);
}
ch = getc();
if (ch == cESC) {
/* Escape Sequence */
ch = getc();
switch (ch) {
case cESC: /* ESC */
pressed_key.scan_code = 23;
break;
case 'O': /* F1 - F4 */
pressed_key.scan_code = getc() - 'P' + 11;
break;
case 'a'...'z':
ch = ch - 'a';
break;
case '[':
ch = getc();
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': /* F5 - F8 */
pressed_key.scan_code = getc() - '0' + 11;
getc();
break;
case '2': /* F9 - F12 */
pressed_key.scan_code = getc() - '0' + 19;
getc();
break;
case '3': /* DEL */
pressed_key.scan_code = 8;
getc();
break;
}
break;
}
} else if (ch == 0x7f) {
/* Backspace */
ch = 0x08;
}
pressed_key.unicode_char = ch;
*key = pressed_key;
return EFI_EXIT(EFI_SUCCESS);
}
const struct efi_simple_input_interface efi_con_in = {
.reset = efi_cin_reset,
.read_key_stroke = efi_cin_read_key_stroke,
.wait_for_key = NULL,
};