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author | Richard Weinberger <richard@nod.at> | 2011-05-24 17:13:01 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-25 08:39:41 -0700 |
commit | d634f194d4e2e58d57927c812aca097e67a2287d (patch) | |
tree | ca17ff43725293ea0bda7a7d7e8ed23ad4f89e14 /arch/um/kernel/early_printk.c | |
parent | 2525e70d492f8c7bbe1292db8fcd973607a56ac6 (diff) | |
download | op-kernel-dev-d634f194d4e2e58d57927c812aca097e67a2287d.zip op-kernel-dev-d634f194d4e2e58d57927c812aca097e67a2287d.tar.gz |
um: add earlyprintk support
User Mode Linux can also benefit from earlyprintk. UML's earlyprintk
writes kernel messages directly to stdout.
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/um/kernel/early_printk.c')
-rw-r--r-- | arch/um/kernel/early_printk.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/um/kernel/early_printk.c b/arch/um/kernel/early_printk.c new file mode 100644 index 0000000..ec649bf --- /dev/null +++ b/arch/um/kernel/early_printk.c @@ -0,0 +1,33 @@ +/* + * Copyright (C) 2011 Richard Weinberger <richrd@nod.at> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/kernel.h> +#include <linux/console.h> +#include <linux/init.h> +#include "os.h" + +static void early_console_write(struct console *con, const char *s, unsigned int n) +{ + um_early_printk(s, n); +} + +static struct console early_console = { + .name = "earlycon", + .write = early_console_write, + .flags = CON_BOOT, + .index = -1, +}; + +static int __init setup_early_printk(char *buf) +{ + register_console(&early_console); + + return 0; +} + +early_param("earlyprintk", setup_early_printk); |