debugcon.c File Reference

Debug port console. More...

#include <stdint.h>
#include <ipxe/io.h>
#include <ipxe/console.h>
#include <ipxe/init.h>
#include <config/console.h>

Go to the source code of this file.

Macros
#define	DEBUG_PORT   0xe9
	Debug port. More...
#define	DEBUG_PORT_CHECK   0xe9
	Debug port installation check magic value. More...
#define	CONSOLE_DEBUGCON   ( CONSOLE_USAGE_ALL & ~CONSOLE_USAGE_TUI )

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
static void	debugcon_putchar (int character)
	Print a character to debug port console. More...
static void	debugcon_init (void)
	Initialise debug port console. More...
struct init_fn debugcon_init_fn	__init_fn (INIT_EARLY)
	Debug port console initialisation function. More...

Variables
struct console_driver debugcon_console	__console_driver
	Debug port console driver. More...

Detailed Description

Debug port console.

The debug port is supported by bochs (via the "port_e9_hack" configuration file directive) and by qemu (via the "-debugcon" command-line option).

Definition in file debugcon.c.

Macro Definition Documentation

DEBUG_PORT

#define DEBUG_PORT   0xe9

Debug port.

Definition at line 42 of file debugcon.c.

DEBUG_PORT_CHECK

#define DEBUG_PORT_CHECK   0xe9

Debug port installation check magic value.

Definition at line 45 of file debugcon.c.

CONSOLE_DEBUGCON

#define CONSOLE_DEBUGCON   ( CONSOLE_USAGE_ALL & ~CONSOLE_USAGE_TUI )

Definition at line 50 of file debugcon.c.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

debugcon_putchar()

static void debugcon_putchar ( int  character )

static

Print a character to debug port console.

Parameters

character

Character to be printed

Definition at line 58 of file debugcon.c.

                                               {

        /* Write character to debug port */
        outb ( character, DEBUG_PORT );
}

References DEBUG_PORT, and outb.

debugcon_init()

static void debugcon_init ( void  )

static

Initialise debug port console.

Definition at line 74 of file debugcon.c.

                                   {
        uint8_t check;

        /* Check if console is present */
        check = inb ( DEBUG_PORT );
        if ( check != DEBUG_PORT_CHECK ) {
                DBG ( "Debug port not present; disabling console\n" );
                debugcon_console.disabled = CONSOLE_DISABLED;
        }
}

References CONSOLE_DISABLED, DBG, DEBUG_PORT, DEBUG_PORT_CHECK, and inb().

__init_fn()

struct init_fn debugcon_init_fn __init_fn

(

INIT_EARLY

)

Debug port console initialisation function.

Variable Documentation

__console_driver

struct console_driver debugcon_console __console_driver

Initial value:

= {
        .putchar = debugcon_putchar,
        .usage = CONSOLE_DEBUGCON,
}

Debug port console driver.

Definition at line 65 of file debugcon.c.