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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
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@@ -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 The VGA output is eventually overwritten by the real
console. 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] eata= [HW,SCSI]
edd= [EDD] 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, .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_init(init_kgdboc);
module_exit(cleanup_kgdboc); module_exit(cleanup_kgdboc);
module_param_call(kgdboc, param_set_kgdboc_var, param_get_string, &kps, 0644); module_param_call(kgdboc, param_set_kgdboc_var, param_get_string, &kps, 0644);