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, 109 insertions, 0 deletions

diff --git a/kernel/arch/score/mm/init.c b/kernel/arch/score/mm/init.c
new file mode 100644
index 000000000..9fbce49ad
--- /dev/null
+++ b/kernel/arch/score/mm/init.c
@@ -0,0 +1,109 @@
+/*
+ * arch/score/mm/init.c
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ *  Lennox Wu <lennox.wu@sunplusct.com>
+ *  Chen Liqin <liqin.chen@sunplusct.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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/errno.h>
+#include <linux/bootmem.h>
+#include <linux/kernel.h>
+#include <linux/gfp.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/pagemap.h>
+#include <linux/kcore.h>
+#include <linux/sched.h>
+#include <linux/initrd.h>
+
+#include <asm/sections.h>
+#include <asm/tlb.h>
+
+unsigned long empty_zero_page;
+EXPORT_SYMBOL_GPL(empty_zero_page);
+
+static void setup_zero_page(void)
+{
+	struct page *page;
+
+	empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, 0);
+	if (!empty_zero_page)
+		panic("Oh boy, that early out of memory?");
+
+	page = virt_to_page((void *) empty_zero_page);
+	mark_page_reserved(page);
+}
+
+#ifndef CONFIG_NEED_MULTIPLE_NODES
+int page_is_ram(unsigned long pagenr)
+{
+	if (pagenr >= min_low_pfn && pagenr < max_low_pfn)
+		return 1;
+	else
+		return 0;
+}
+
+void __init paging_init(void)
+{
+	unsigned long max_zone_pfns[MAX_NR_ZONES];
+	unsigned long lastpfn;
+
+	pagetable_init();
+	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
+	lastpfn = max_low_pfn;
+	free_area_init_nodes(max_zone_pfns);
+}
+
+void __init mem_init(void)
+{
+	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
+	free_all_bootmem();
+	setup_zero_page();	/* Setup zeroed pages. */
+
+	mem_init_print_info(NULL);
+}
+#endif /* !CONFIG_NEED_MULTIPLE_NODES */
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+	free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
+			   "initrd");
+}
+#endif
+
+void __init_refok free_initmem(void)
+{
+	free_initmem_default(POISON_FREE_INITMEM);
+}
+
+unsigned long pgd_current;
+
+#define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order)))
+
+/*
+ * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
+ * are constants.  So we use the variants from asm-offset.h until that gcc
+ * will officially be retired.
+ */
+pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned(PTE_ORDER);
+pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);