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, 66 insertions, 0 deletions

diff --git a/kernel/arch/x86/um/stub_64.S b/kernel/arch/x86/um/stub_64.S
new file mode 100644
index 000000000..7160b2017
--- /dev/null
+++ b/kernel/arch/x86/um/stub_64.S
@@ -0,0 +1,66 @@
+#include <as-layout.h>
+
+	.globl syscall_stub
+.section .__syscall_stub, "ax"
+syscall_stub:
+	syscall
+	/* We don't have 64-bit constants, so this constructs the address
+	 * we need.
+	 */
+	movq	$(STUB_DATA >> 32), %rbx
+	salq	$32, %rbx
+	movq	$(STUB_DATA & 0xffffffff), %rcx
+	or	%rcx, %rbx
+	movq	%rax, (%rbx)
+	int3
+
+	.globl batch_syscall_stub
+batch_syscall_stub:
+	mov	$(STUB_DATA >> 32), %rbx
+	sal	$32, %rbx
+	mov	$(STUB_DATA & 0xffffffff), %rax
+	or	%rax, %rbx
+	/* load pointer to first operation */
+	mov	%rbx, %rsp
+	add	$0x10, %rsp
+again:
+	/* load length of additional data */
+	mov	0x0(%rsp), %rax
+
+	/* if(length == 0) : end of list */
+	/* write possible 0 to header */
+	mov	%rax, 8(%rbx)
+	cmp	$0, %rax
+	jz	done
+
+	/* save current pointer */
+	mov	%rsp, 8(%rbx)
+
+	/* skip additional data */
+	add	%rax, %rsp
+
+	/* load syscall-# */
+	pop	%rax
+
+	/* load syscall params */
+	pop	%rdi
+	pop	%rsi
+	pop	%rdx
+	pop	%r10
+ 	pop	%r8
+	pop	%r9
+
+	/* execute syscall */
+	syscall
+
+	/* check return value */
+	pop	%rcx
+	cmp	%rcx, %rax
+	je	again
+
+done:
+	/* save return value */
+	mov	%rax, (%rbx)
+
+	/* stop */
+	int3