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    Subject[PATCH 5/8] kgdboc: Add ekgdboc for early use of the kernel debugger
    Date
    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>
    ---
    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 c6936b2..aaeb992 100644
    --- a/Documentation/kernel-parameters.txt
    +++ b/Documentation/kernel-parameters.txt
    @@ -708,6 +708,12 @@ 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 201cdf5..e8557a5 100644
    --- a/drivers/serial/kgdboc.c
    +++ b/drivers/serial/kgdboc.c
    @@ -236,6 +236,25 @@ 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


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