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kgdboc: Add ekgdboc for early use of the kernel debugger

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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: Jason Wessel <jason.wessel@windriver.com>
This commit is contained in:
Jason Wessel 2010-05-20 21:04:30 -05:00
parent 0bb9fef913
commit 9731191f75
2 changed files with 25 additions and 0 deletions
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6
Documentation/kernel-parameters.txt
View file

@ -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]

19
drivers/serial/kgdboc.c
View file

@ -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);