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, 51 insertions, 0 deletions

diff --git a/kernel/arch/arm/plat-iop/cp6.c b/kernel/arch/arm/plat-iop/cp6.c
new file mode 100644
index 000000000..bab73e2c7
--- /dev/null
+++ b/kernel/arch/arm/plat-iop/cp6.c
@@ -0,0 +1,51 @@
+/*
+ * IOP Coprocessor-6 access handler
+ * Copyright (c) 2006, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ */
+#include <linux/init.h>
+#include <asm/traps.h>
+#include <asm/ptrace.h>
+
+static int cp6_trap(struct pt_regs *regs, unsigned int instr)
+{
+	u32 temp;
+
+        /* enable cp6 access */
+        asm volatile (
+		"mrc	p15, 0, %0, c15, c1, 0\n\t"
+		"orr	%0, %0, #(1 << 6)\n\t"
+		"mcr	p15, 0, %0, c15, c1, 0\n\t"
+		: "=r"(temp));
+
+	return 0;
+}
+
+/* permit kernel space cp6 access
+ * deny user space cp6 access
+ */
+static struct undef_hook cp6_hook = {
+	.instr_mask     = 0x0f000ff0,
+	.instr_val      = 0x0e000610,
+	.cpsr_mask      = MODE_MASK,
+	.cpsr_val       = SVC_MODE,
+	.fn             = cp6_trap,
+};
+
+void __init iop_init_cp6_handler(void)
+{
+	register_undef_hook(&cp6_hook);
+}