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-rw-r--r--arch/arm/kernel/early_printk.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/arch/arm/kernel/early_printk.c b/arch/arm/kernel/early_printk.c
new file mode 100644
index 000000000..430765369
--- /dev/null
+++ b/arch/arm/kernel/early_printk.c
@@ -0,0 +1,46 @@
+/*
+ * linux/arch/arm/kernel/early_printk.c
+ *
+ * Copyright (C) 2009 Sascha Hauer <s.hauer@pengutronix.de>
+ *
+ * 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>
+
+extern void printch(int);
+
+static void early_write(const char *s, unsigned n)
+{
+ while (n-- > 0) {
+ if (*s == '\n')
+ printch('\r');
+ printch(*s);
+ s++;
+ }
+}
+
+static void early_console_write(struct console *con, const char *s, unsigned n)
+{
+ early_write(s, n);
+}
+
+static struct console early_console_dev = {
+ .name = "earlycon",
+ .write = early_console_write,
+ .flags = CON_PRINTBUFFER | CON_BOOT,
+ .index = -1,
+};
+
+static int __init setup_early_printk(char *buf)
+{
+ early_console = &early_console_dev;
+ register_console(&early_console_dev);
+ return 0;
+}
+
+early_param("earlyprintk", setup_early_printk);