User interaction. More...

#include <stddef.h>
#include <stdio.h>
#include <ipxe/tables.h>

Data Structures
struct	console_configuration
	A console configuration. More...

struct	console_driver
	A console driver. More...

Macros
#define	CONSOLE_DISABLED_INPUT 0x0001
	Console is disabled for input. More...

#define	CONSOLE_DISABLED_OUTPUT 0x0002
	Console is disabled for output. More...

#define	CONSOLE_DISABLED ( CONSOLE_DISABLED_INPUT \| CONSOLE_DISABLED_OUTPUT )
	Console is disabled for all uses. More...

#define	CONSOLES __table ( struct console_driver, "consoles" )
	Console driver table. More...

#define	__console_driver __table_entry ( CONSOLES, 01 )
	Mark a `struct console_driver` as being part of the console drivers table. More...

#define	CONSOLE_USAGE_STDOUT 0x0001
	Standard output. More...

#define	CONSOLE_USAGE_DEBUG 0x0002
	Debug messages. More...

#define	CONSOLE_USAGE_TUI 0x0004
	Text-based user interface. More...

#define	CONSOLE_USAGE_LOG 0x0008
	Log messages. More...

#define	CONSOLE_USAGE_ALL
	All console usages. More...

#define	CONSOLE_EXPLICIT(console) ( ( 2 * console + 1 ) != 2 )
	Test to see if console has an explicit usage. More...

#define	CONSOLE_DEFAULT_WIDTH 80
	Default console width. More...

#define	CONSOLE_DEFAULT_HEIGHT 25
	Default console height. More...

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)

	FILE_SECBOOT (PERMITTED)

static int	console_set_usage (int usage)
	Set console usage. More...

static void	console_set_size (unsigned int width, unsigned int height)
	Set console size. More...

int	iskey (void)
	Check for available input on any console. More...

int	getkey (unsigned long timeout)
	Get single keypress. More...

int	console_configure (struct console_configuration *config)
	Configure console. More...

static void	console_reset (void)
	Reset console. More...

Variables
int	console_usage
	Current console usage. More...

unsigned int	console_width
	Console width. More...

unsigned int	console_height
	Console height. More...

Detailed Description

User interaction.

Various console devices can be selected via the build options CONSOLE_FIRMWARE, CONSOLE_SERIAL etc. The console functions putchar(), getchar() and iskey() delegate to the individual console drivers.

Definition in file console.h.

Macro Definition Documentation

◆ CONSOLE_DISABLED_INPUT

#define CONSOLE_DISABLED_INPUT 0x0001

Console is disabled for input.

Definition at line 106 of file console.h.

◆ CONSOLE_DISABLED_OUTPUT

#define CONSOLE_DISABLED_OUTPUT 0x0002

Console is disabled for output.

Definition at line 109 of file console.h.

◆ CONSOLE_DISABLED

#define CONSOLE_DISABLED ( CONSOLE_DISABLED_INPUT | CONSOLE_DISABLED_OUTPUT )

Console is disabled for all uses.

Definition at line 112 of file console.h.

◆ CONSOLES

#define CONSOLES __table ( struct console_driver, "consoles" )

Console driver table.

Definition at line 115 of file console.h.

◆ __console_driver

struct console_driver vesafb_console __console_driver __table_entry ( CONSOLES, 01 )

Mark a struct console_driver as being part of the console drivers table.

VESA frame buffer console driver.

INT13 console driver.

EFI graphics output protocol console driver.

Encrypted syslog console driver.

Use as e.g.

struct console_driver my_console __console_driver = {
   .putchar = my_putchar,
   .getchar = my_getchar,
   .iskey = my_iskey,
};

Definition at line 134 of file console.h.

◆ CONSOLE_EXPLICIT

#define CONSOLE_EXPLICIT ( console ) ( ( 2 * console + 1 ) != 2 )

Test to see if console has an explicit usage.

Parameters

console Console definition (e.g. CONSOLE_PCBIOS)

Return values

explicit Console has an explicit usage

This relies upon the trick that the expression ( 2 * N + 1 ) will be valid even if N is defined to be empty, since it will then evaluate to give ( 2 * + 1 ) == ( 2 * +1 ) == 2.

Definition at line 169 of file console.h.

◆ CONSOLE_DEFAULT_WIDTH

#define CONSOLE_DEFAULT_WIDTH 80

Default console width.

Definition at line 172 of file console.h.

◆ CONSOLE_DEFAULT_HEIGHT

#define CONSOLE_DEFAULT_HEIGHT 25

Default console height.

Definition at line 175 of file console.h.

Function Documentation

◆ FILE_LICENCE()

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL )

◆ FILE_SECBOOT()

FILE_SECBOOT ( PERMITTED )

◆ console_set_usage()

static int console_set_usage ( int usage )

inlinestatic

Set console usage.

Parameters

usage New console usage

Return values

old_usage Previous console usage

Definition at line 188 of file console.h.

                                 {
         int old_usage = console_usage;
 
         console_usage = usage;
         return old_usage;
 }

References console_usage.

Referenced by ansiscr_exit(), ansiscr_init(), dbg_printf(), and log_vprintf().

◆ console_set_size()

static void console_set_size	(	unsigned int	width,
		unsigned int	height
	)

inlinestatic

Set console size.

Parameters

width	Width, in characters
height	Height, in characters

Definition at line 202 of file console.h.

                                                              {
         console_width = width;
         console_height = height;
 }

References console_height, console_width, console_configuration::height, and console_configuration::width.

Referenced by console_configure(), and fbcon_init().

◆ iskey()

int iskey ( void )

Check for available input on any console.

Return values

is_available Input is available on a console

All enabled console devices are checked once for available input using each device's console_driver::iskey() method. If any console device has input available, this call will return true. If this call returns true, you can then safely call getchar() without blocking.

Definition at line 131 of file console.c.

                    {
         return has_input() ? 1 : 0;
 }

References has_input().

Referenced by ansiscr_peek(), bios_inject(), getchar_timeout(), int21(), keypress_interrupted(), loopback_wait(), monojob_wait(), and pxe_menu_prompt_and_select().

◆ getkey()

int getkey ( unsigned long timeout )

Get single keypress.

Parameters

timeout Timeout period, in ticks (0=indefinite)

Return values

key	Key pressed

The returned key will be an ASCII value or a KEY_XXX special constant. This function differs from getchar() in that getchar() will return "special" keys (e.g. cursor keys) as a series of characters forming an ANSI escape sequence.

Definition at line 72 of file getkey.c.

                                      {
         int character;
         unsigned int n = 0;
 
         character = getchar_timeout ( timeout );
         if ( character != ESC )
                 return character;
 
         character = getchar_timeout ( GETKEY_TIMEOUT );
         if ( character < 0 )
                 return ESC;
 
         if ( isalpha ( character ) )
                 return ( toupper ( character ) - 'A' + 1 );
 
         while ( ( character = getchar_timeout ( GETKEY_TIMEOUT ) ) >= 0 ) {
                 if ( isdigit ( character ) ) {
                         n = ( ( n * 10 ) + ( character - '0' ) );
                         continue;
                 }
                 if ( character >= 0x40 )
                         return KEY_ANSI ( n, character );
         }
 
         return ESC;
 }

References ESC, getchar_timeout(), GETKEY_TIMEOUT, isalpha(), isdigit(), KEY_ANSI, timeout(), and toupper().

Referenced by bios_inject(), form_loop(), main_loop(), menu_loop(), prompt(), pxe_menu_prompt_and_select(), pxe_menu_select(), and readline_history().

◆ console_configure()

int console_configure ( struct console_configuration * config )

Configure console.

Parameters

config Console configuration

Return values

rc	Return status code

The configuration is passed to all configurable consoles, including those which are currently disabled. Consoles may choose to enable or disable themselves depending upon the configuration.

If configuration fails, then all consoles will be reset.

Definition at line 147 of file console.c.

                                                                {
         struct console_driver *console;
         int rc;
 
         /* Reset console width and height */
         console_set_size ( CONSOLE_DEFAULT_WIDTH, CONSOLE_DEFAULT_HEIGHT );
 
         /* Try to configure each console */
         for_each_table_entry ( console, CONSOLES ) {
                 if ( ( console->configure ) &&
                      ( ( rc = console->configure ( config ) ) != 0 ) )
                                 goto err;
         }
 
         return 0;
 
  err:
         /* Reset all consoles, avoiding a potential infinite loop */
         if ( config )
                 console_reset();
         return rc;
 }

References console_driver::configure, CONSOLE_DEFAULT_HEIGHT, CONSOLE_DEFAULT_WIDTH, console_reset(), console_set_size(), CONSOLES, for_each_table_entry, and rc.

Referenced by console_exec(), and console_reset().

◆ console_reset()

static void console_reset ( void )

inlinestatic

Reset console.

Definition at line 215 of file console.h.

                                                                             {
 
         console_configure ( NULL );
 }

References console_configure(), and NULL.

Referenced by call_bootsector(), com32_exec(), comboot_exec(), console_configure(), efi_image_exec(), efi_snp_load_file(), pxe_exec(), and shutdown().

Variable Documentation

◆ console_usage

int console_usage

Current console usage.

Definition at line 12 of file console.c.

Referenced by console_set_usage(), and putchar().

◆ console_width

unsigned int console_width

Console width.

Definition at line 15 of file console.c.

Referenced by bios_handle_ed(), and console_set_size().

◆ console_height

unsigned int console_height

Console height.

Definition at line 18 of file console.c.

Referenced by bios_handle_ed(), and console_set_size().

Data Structures

Macros

Functions

Variables

Detailed Description

Macro Definition Documentation

◆ CONSOLE_DISABLED_INPUT

◆ CONSOLE_DISABLED_OUTPUT

◆ CONSOLE_DISABLED

◆ CONSOLES

◆ __console_driver

◆ CONSOLE_EXPLICIT

◆ CONSOLE_DEFAULT_WIDTH

◆ CONSOLE_DEFAULT_HEIGHT

Function Documentation

◆ FILE_LICENCE()

◆ FILE_SECBOOT()

◆ console_set_usage()

◆ console_set_size()

◆ iskey()

◆ getkey()

◆ console_configure()

◆ console_reset()

Variable Documentation

◆ console_usage

◆ console_width

◆ console_height