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Commit 9731191f authored by Jason Wessel's avatar Jason Wessel
Browse files

kgdboc: Add ekgdboc for early use of the kernel debugger 



The ekgdboc= differs from kgdboc= in that you can begin debuggin as
soon as the exceptions are setup and the kgdb I/O driver is available,
instead of waiting until the tty subsystem is available.

CC: kgdb-bugreport@lists.sourceforge.net
Signed-off-by: default avatarJason Wessel <jason.wessel@windriver.com>
parent 0bb9fef9

Documentation/kernel-parameters.txt

+6 −0
Original line number Diff line number Diff line
@@ -713,6 +713,12 @@ and is between 256 and 4096 characters. It is defined in the file 
			The VGA output is eventually overwritten by the real

			console.



	ekgdboc=	[X86,KGDB] Allow early kernel console debugging

			ekgdboc=kbd



			This is desgined to be used in conjunction with

			the boot argument: earlyprintk=vga



	eata=		[HW,SCSI]



	edd=		[EDD]

drivers/serial/kgdboc.c

+19 −0
Original line number Diff line number Diff line
@@ -223,6 +223,25 @@ static struct kgdb_io kgdboc_io_ops = { 
	.post_exception		= kgdboc_post_exp_handler,

};



#ifdef CONFIG_KGDB_SERIAL_CONSOLE

/* This is only available if kgdboc is a built in for early debugging */

int __init kgdboc_early_init(char *opt)

{

	/* save the first character of the config string because the

	 * init routine can destroy it.

	 */

	char save_ch;



	kgdboc_option_setup(opt);

	save_ch = config[0];

	init_kgdboc();

	config[0] = save_ch;

	return 0;

}



early_param("ekgdboc", kgdboc_early_init);

#endif /* CONFIG_KGDB_SERIAL_CONSOLE */



module_init(init_kgdboc);

module_exit(cleanup_kgdboc);

module_param_call(kgdboc, param_set_kgdboc_var, param_get_string, &kps, 0644);