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authorRichard Weinberger <richard@nod.at>2011-05-24 17:13:01 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-05-25 08:39:41 -0700
commitd634f194d4e2e58d57927c812aca097e67a2287d (patch)
treeca17ff43725293ea0bda7a7d7e8ed23ad4f89e14 /arch/um/kernel/early_printk.c
parent2525e70d492f8c7bbe1292db8fcd973607a56ac6 (diff)
downloadop-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.c33
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);
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