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, 71 insertions, 0 deletions

diff --git a/kernel/arch/frv/mm/cache-page.c b/kernel/arch/frv/mm/cache-page.c
new file mode 100644
index 000000000..8e09dae0e
--- /dev/null
+++ b/kernel/arch/frv/mm/cache-page.c
@@ -0,0 +1,71 @@
+/* cache-page.c: whole-page cache wrangling functions for MMU linux
+ *
+ * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.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/sched.h>
+#include <linux/mm.h>
+#include <linux/highmem.h>
+#include <linux/module.h>
+#include <asm/pgalloc.h>
+
+/*****************************************************************************/
+/*
+ * DCF takes a virtual address and the page may not currently have one
+ * - temporarily hijack a kmap_atomic() slot and attach the page to it
+ */
+void flush_dcache_page(struct page *page)
+{
+	unsigned long dampr2;
+	void *vaddr;
+
+	dampr2 = __get_DAMPR(2);
+
+	vaddr = kmap_atomic_primary(page);
+
+	frv_dcache_writeback((unsigned long) vaddr, (unsigned long) vaddr + PAGE_SIZE);
+
+	kunmap_atomic_primary(vaddr);
+
+	if (dampr2) {
+		__set_DAMPR(2, dampr2);
+		__set_IAMPR(2, dampr2);
+	}
+
+} /* end flush_dcache_page() */
+
+EXPORT_SYMBOL(flush_dcache_page);
+
+/*****************************************************************************/
+/*
+ * ICI takes a virtual address and the page may not currently have one
+ * - so we temporarily attach the page to a bit of virtual space so that is can be flushed
+ */
+void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
+			     unsigned long start, unsigned long len)
+{
+	unsigned long dampr2;
+	void *vaddr;
+
+	dampr2 = __get_DAMPR(2);
+
+	vaddr = kmap_atomic_primary(page);
+
+	start = (start & ~PAGE_MASK) | (unsigned long) vaddr;
+	frv_cache_wback_inv(start, start + len);
+
+	kunmap_atomic_primary(vaddr);
+
+	if (dampr2) {
+		__set_DAMPR(2, dampr2);
+		__set_IAMPR(2, dampr2);
+	}
+
+} /* end flush_icache_user_range() */
+
+EXPORT_SYMBOL(flush_icache_user_range);