earlycon.h File Reference

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Data Structures
struct	earlycon
	An early console's operations. More...

Functions
void	earlycon_init (void)
	Sets up the early console at boot, before anything else.
void	earlycon_reinit (void)
	Sets up the early console again, once the kernel's command line has been read, since it may choose another console (earlycon=).
int	earlycon_puts (char *s)
	Writes a string on the early console.
int	earlycon_putc (char c)
	Writes a character on the early console.
int	earlycon_on_screen (void)
	Says whether the early console writes on the screen, rather than on a serial port.
void	earlycon_disable (void)
	Stops sending the kernel's messages to the early console, once a real console has taken over.
void	printk_console (void(*write)(const char *s, size_t len))
	Registers the console that the kernel's messages are written to, besides the message buffer.

Function Documentation

earlycon_disable()

void earlycon_disable

(

void

)

Stops sending the kernel's messages to the early console, once a real console has taken over.

Definition at line 34 of file printk.c.

References earlycon_disable(), and use_earlycon.

Referenced by earlycon_disable(), kmain(), and vt_probe().

earlycon_init()

void earlycon_init

(

void

)

Sets up the early console at boot, before anything else.

Definition at line 59 of file earlycon.c.

References earlycon_init(), earlycon_uart, and earlycon::init.

Referenced by aarch64_init(), earlycon_init(), earlycon_init(), and x86_cpu_init().

earlycon_on_screen()

int earlycon_on_screen

(

void

)

Says whether the early console writes on the screen, rather than on a serial port.

Returns

1 if it writes on the screen, 0 if not

Definition at line 52 of file earlycon.c.

References earlycon_on_screen(), and earlycon_uart.

Referenced by earlycon_on_screen(), and vt_probe().

earlycon_putc()

int earlycon_putc

(

char

c

)

Writes a character on the early console.

Parameters

c	the character

Returns

1 if it was written, 0 if not

Definition at line 23 of file earlycon.c.

References earlycon_putc(), earlycon::putc, UART_DR, UART_FR, and UART_FR_TXFF.

Referenced by earlycon_putc(), earlycon_puts(), and putc().

earlycon_puts()

int earlycon_puts

(

char *

s

)

Writes a string on the early console.

Parameters

s	the string

Returns

how many characters were written

Definition at line 38 of file earlycon.c.

References earlycon_putc(), earlycon_puts(), and earlycon::puts.

Referenced by earlycon_puts(), and puts().

earlycon_reinit()

void earlycon_reinit

(

void

)

Sets up the early console again, once the kernel's command line has been read, since it may choose another console (earlycon=).

Definition at line 65 of file earlycon.c.

References earlycon_fb, earlycon_fb_available(), earlycon_reinit(), earlycon_uart, earlycon_vga, earlycon::init, kargs_get(), and NULL.

Referenced by aarch64_init(), earlycon_reinit(), earlycon_reinit(), and x86_cpu_init().

printk_console()

void printk_console

(

void(*

write )(const char *s, size_t len)

)

Registers the console that the kernel's messages are written to, besides the message buffer.

Parameters

write

the console's write function

Definition at line 47 of file printk.c.

References console_write, and printk_console().

Referenced by printk_console(), and vt_probe().