Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/kernel/arch/mips/loongson/common/early_printk.c b/kernel/arch/mips/loongson/common/early_printk.c
new file mode 100644
index 000000000..6ca632e52
--- /dev/null
+++ b/kernel/arch/mips/loongson/common/early_printk.c
@@ -0,0 +1,41 @@
+/*  early printk support
+ *
+ *  Copyright (c) 2009 Philippe Vachon <philippe@cowpig.ca>
+ *  Copyright (c) 2009 Lemote Inc.
+ *  Author: Wu Zhangjin, wuzhangjin@gmail.com
+ *
+ *  This program is free software; you can redistribute	 it and/or modify it
+ *  under  the terms of	 the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the	License, or (at your
+ *  option) any later version.
+ */
+#include <linux/serial_reg.h>
+
+#include <loongson.h>
+
+#define PORT(base, offset) (u8 *)(base + offset)
+
+static inline unsigned int serial_in(unsigned char *base, int offset)
+{
+	return readb(PORT(base, offset));
+}
+
+static inline void serial_out(unsigned char *base, int offset, int value)
+{
+	writeb(value, PORT(base, offset));
+}
+
+void prom_putchar(char c)
+{
+	int timeout;
+	unsigned char *uart_base;
+
+	uart_base = (unsigned char *)_loongson_uart_base[0];
+	timeout = 1024;
+
+	while (((serial_in(uart_base, UART_LSR) & UART_LSR_THRE) == 0) &&
+			(timeout-- > 0))
+		;
+
+	serial_out(uart_base, UART_TX, c);
+}