earlycon.c File Reference

aarch64's early console: the PL011 UART, written to a character at a time by polling, until the terminals are up. More...

#include <core/system.h>
#include <console/earlycon.h>
#include <cpu/io.h>
#include <platform/virt.h>

Go to the source code of this file.

Macros
#define	UART_DR   0x00
#define	UART_FR   0x18
#define	UART_FR_TXFF   (1 << 5)

Functions
int	earlycon_putc (char c)
	Writes a character on the early console.
int	earlycon_puts (char *s)
	Writes a string 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_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=).

Variables
static uintptr_t	uart = VIRT_REG(VIRT_UART)

Detailed Description

aarch64's early console: the PL011 UART, written to a character at a time by polling, until the terminals are up.

Definition in file earlycon.c.

Macro Definition Documentation

UART_DR

#define UART_DR   0x00

Definition at line 12 of file earlycon.c.

Referenced by earlycon_putc(), pl011_receive(), and pl011_transmit().

UART_FR

#define UART_FR   0x18

Definition at line 13 of file earlycon.c.

Referenced by earlycon_putc(), pl011_irq(), and pl011_transmit().

UART_FR_TXFF

#define UART_FR_TXFF   (1 << 5)

Definition at line 14 of file earlycon.c.

Referenced by earlycon_putc().

Function Documentation

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().

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().

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(), 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(), 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_reinit().

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

Variable Documentation

uart

uintptr_t uart = VIRT_REG(VIRT_UART)

static

Definition at line 16 of file earlycon.c.