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, 58 insertions, 0 deletions

diff --git a/kernel/arch/um/os-Linux/registers.c b/kernel/arch/um/os-Linux/registers.c
new file mode 100644
index 000000000..2ff8d4fe8
--- /dev/null
+++ b/kernel/arch/um/os-Linux/registers.c
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2004 PathScale, Inc
+ * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <sys/ptrace.h>
+#include <sysdep/ptrace.h>
+#include <sysdep/ptrace_user.h>
+#include <registers.h>
+
+int save_registers(int pid, struct uml_pt_regs *regs)
+{
+	int err;
+
+	err = ptrace(PTRACE_GETREGS, pid, 0, regs->gp);
+	if (err < 0)
+		return -errno;
+	return 0;
+}
+
+int restore_registers(int pid, struct uml_pt_regs *regs)
+{
+	int err;
+
+	err = ptrace(PTRACE_SETREGS, pid, 0, regs->gp);
+	if (err < 0)
+		return -errno;
+	return 0;
+}
+
+/* This is set once at boot time and not changed thereafter */
+
+static unsigned long exec_regs[MAX_REG_NR];
+static unsigned long exec_fp_regs[FP_SIZE];
+
+int init_registers(int pid)
+{
+	int err;
+
+	err = ptrace(PTRACE_GETREGS, pid, 0, exec_regs);
+	if (err < 0)
+		return -errno;
+
+	arch_init_registers(pid);
+	get_fp_registers(pid, exec_fp_regs);
+	return 0;
+}
+
+void get_safe_registers(unsigned long *regs, unsigned long *fp_regs)
+{
+	memcpy(regs, exec_regs, sizeof(exec_regs));
+
+	if (fp_regs)
+		memcpy(fp_regs, exec_fp_regs, sizeof(exec_fp_regs));
+}