From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757642Ab0BLWoQ (ORCPT ); Fri, 12 Feb 2010 17:44:16 -0500 Received: from mail.windriver.com ([147.11.1.11]:45173 "EHLO mail.windriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757927Ab0BLWn3 (ORCPT ); Fri, 12 Feb 2010 17:43:29 -0500 From: Jason Wessel To: linux-kernel@vger.kernel.org Cc: kgdb-bugreport@lists.sourceforge.net, mingo@elte.hu, Jason Wessel Subject: [PATCH 5/8] kgdboc: Add ekgdboc for early use of the kernel debugger Date: Fri, 12 Feb 2010 16:39:26 -0600 Message-Id: <1266014369-29547-6-git-send-email-jason.wessel@windriver.com> X-Mailer: git-send-email 1.6.4.rc1 In-Reply-To: <1266014369-29547-1-git-send-email-jason.wessel@windriver.com> References: <1266014369-29547-1-git-send-email-jason.wessel@windriver.com> X-OriginalArrivalTime: 12 Feb 2010 22:43:10.0702 (UTC) FILETIME=[C0D630E0:01CAAC34] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- Documentation/kernel-parameters.txt | 6 ++++++ drivers/serial/kgdboc.c | 19 +++++++++++++++++++ 2 files changed, 25 insertions(+), 0 deletions(-) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index b340445..5227565 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -699,6 +699,12 @@ 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] diff --git a/drivers/serial/kgdboc.c b/drivers/serial/kgdboc.c index 246b7c3..91ca95a 100644 --- a/drivers/serial/kgdboc.c +++ b/drivers/serial/kgdboc.c @@ -263,6 +263,25 @@ 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); -- 1.6.4.rc1