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, 111 insertions, 0 deletions

diff --git a/kernel/arch/mips/mti-sead3/sead3-setup.c b/kernel/arch/mips/mti-sead3/sead3-setup.c
new file mode 100644
index 000000000..e43f4801a
--- /dev/null
+++ b/kernel/arch/mips/mti-sead3/sead3-setup.c
@@ -0,0 +1,111 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2012 MIPS Technologies, Inc.  All rights reserved.
+ * Copyright (C) 2013 Imagination Technologies Ltd.
+ */
+#include <linux/init.h>
+#include <linux/libfdt.h>
+#include <linux/of_platform.h>
+#include <linux/of_fdt.h>
+
+#include <asm/prom.h>
+#include <asm/fw/fw.h>
+
+#include <asm/mips-boards/generic.h>
+
+const char *get_system_type(void)
+{
+	return "MIPS SEAD3";
+}
+
+static uint32_t get_memsize_from_cmdline(void)
+{
+	int memsize = 0;
+	char *p = arcs_cmdline;
+	char *s = "memsize=";
+
+	p = strstr(p, s);
+	if (p) {
+		p += strlen(s);
+		memsize = memparse(p, NULL);
+	}
+
+	return memsize;
+}
+
+static uint32_t get_memsize_from_env(void)
+{
+	int memsize = 0;
+	char *p;
+
+	p = fw_getenv("memsize");
+	if (p)
+		memsize = memparse(p, NULL);
+
+	return memsize;
+}
+
+static uint32_t get_memsize(void)
+{
+	uint32_t memsize;
+
+	memsize = get_memsize_from_cmdline();
+	if (memsize)
+		return memsize;
+
+	return get_memsize_from_env();
+}
+
+static void __init parse_memsize_param(void)
+{
+	int offset;
+	const uint64_t *prop_value;
+	int prop_len;
+	uint32_t memsize = get_memsize();
+
+	if (!memsize)
+		return;
+
+	offset = fdt_path_offset(__dtb_start, "/memory");
+	if (offset > 0) {
+		uint64_t new_value;
+		/*
+		 * reg contains 2 32-bits BE values, offset and size. We just
+		 * want to replace the size value without affecting the offset
+		 */
+		prop_value = fdt_getprop(__dtb_start, offset, "reg", &prop_len);
+		new_value = be64_to_cpu(*prop_value);
+		new_value =  (new_value & ~0xffffffffllu) | memsize;
+		fdt_setprop_inplace_u64(__dtb_start, offset, "reg", new_value);
+	}
+}
+
+void __init plat_mem_setup(void)
+{
+	/* allow command line/bootloader env to override memory size in DT */
+	parse_memsize_param();
+
+	/*
+	 * Load the builtin devicetree. This causes the chosen node to be
+	 * parsed resulting in our memory appearing
+	 */
+	__dt_setup_arch(__dtb_start);
+}
+
+void __init device_tree_init(void)
+{
+	if (!initial_boot_params)
+		return;
+
+	unflatten_and_copy_device_tree();
+}
+
+static int __init customize_machine(void)
+{
+	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+	return 0;
+}
+arch_initcall(customize_machine);