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>

3 files changed, 87 insertions, 0 deletions

diff --git a/kernel/arch/avr32/boot/u-boot/Makefile b/kernel/arch/avr32/boot/u-boot/Makefile
new file mode 100644
index 000000000..125ddc96c
--- /dev/null
+++ b/kernel/arch/avr32/boot/u-boot/Makefile
@@ -0,0 +1,3 @@
+extra-y		:= head.o
+
+obj-y		:= empty.o
diff --git a/kernel/arch/avr32/boot/u-boot/empty.S b/kernel/arch/avr32/boot/u-boot/empty.S
new file mode 100644
index 000000000..8ac91a5f1
--- /dev/null
+++ b/kernel/arch/avr32/boot/u-boot/empty.S
@@ -0,0 +1 @@
+/* Empty file */
diff --git a/kernel/arch/avr32/boot/u-boot/head.S b/kernel/arch/avr32/boot/u-boot/head.S
new file mode 100644
index 000000000..2ffc298f0
--- /dev/null
+++ b/kernel/arch/avr32/boot/u-boot/head.S
@@ -0,0 +1,83 @@
+/*
+ * Startup code for use with the u-boot bootloader.
+ *
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * 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 <asm/setup.h>
+#include <asm/thread_info.h>
+#include <asm/sysreg.h>
+
+	/*
+	 * The kernel is loaded where we want it to be and all caches
+	 * have just been flushed. We get two parameters from u-boot:
+	 *
+	 * r12 contains a magic number (ATAG_MAGIC)
+	 * r11 points to a tag table providing information about
+	 *     the system.
+	 */
+	.section .init.text,"ax"
+	.global _start
+_start:
+	/* Initialize .bss */
+	lddpc	r2, bss_start_addr
+	lddpc   r3, end_addr
+	mov	r0, 0
+	mov	r1, 0
+1:      st.d    r2++, r0
+	cp      r2, r3
+	brlo    1b
+
+	/* Initialize status register */
+	lddpc	r0, init_sr
+	mtsr	SYSREG_SR, r0
+
+	/* Set initial stack pointer */
+	lddpc	sp, stack_addr
+	sub	sp, -THREAD_SIZE
+
+#ifdef CONFIG_FRAME_POINTER
+	/* Mark last stack frame */
+	mov	lr, 0
+	mov	r7, 0
+#endif
+
+	/* Check if the boot loader actually provided a tag table */
+	lddpc	r0, magic_number
+	cp.w	r12, r0
+	brne	no_tag_table
+
+	/*
+	 * Save the tag table address for later use. This must be done
+	 * _after_ .bss has been initialized...
+	 */
+	lddpc	r0, tag_table_addr
+	st.w	r0[0], r11
+
+	/* Jump to loader-independent setup code */
+	rjmp	kernel_entry
+
+	.align	2
+magic_number:
+	.long	ATAG_MAGIC
+tag_table_addr:
+	.long	bootloader_tags
+bss_start_addr:
+	.long   __bss_start
+end_addr:
+	.long   _end
+init_sr:
+	.long	0x007f0000	/* Supervisor mode, everything masked */
+stack_addr:
+	.long	init_thread_union
+panic_addr:
+	.long	panic
+
+no_tag_table:
+	sub	r12, pc, (. - 2f)
+	/* branch to panic() which can be far away with that construct */
+	lddpc	pc, panic_addr
+2:	.asciz	"Boot loader didn't provide correct magic number\n"