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, 92 insertions, 0 deletions

diff --git a/kernel/arch/score/include/asm/thread_info.h b/kernel/arch/score/include/asm/thread_info.h
new file mode 100644
index 000000000..7d9ffb15c
--- /dev/null
+++ b/kernel/arch/score/include/asm/thread_info.h
@@ -0,0 +1,92 @@
+#ifndef _ASM_SCORE_THREAD_INFO_H
+#define _ASM_SCORE_THREAD_INFO_H
+
+#ifdef __KERNEL__
+
+#define KU_MASK	0x08
+#define KU_USER	0x08
+#define KU_KERN	0x00
+
+#include <asm/page.h>
+#include <linux/const.h>
+
+/* thread information allocation */
+#define THREAD_SIZE_ORDER	(1)
+#define THREAD_SIZE		(PAGE_SIZE << THREAD_SIZE_ORDER)
+#define THREAD_MASK		(THREAD_SIZE - _AC(1,UL))
+
+#ifndef __ASSEMBLY__
+
+#include <asm/processor.h>
+
+/*
+ * low level task data that entry.S needs immediate access to
+ * - this struct should fit entirely inside of one cache line
+ * - this struct shares the supervisor stack pages
+ * - if the contents of this structure are changed, the assembly constants
+ *   must also be changed
+ */
+struct thread_info {
+	struct task_struct	*task;		/* main task structure */
+	unsigned long		flags;		/* low level flags */
+	unsigned long		tp_value;	/* thread pointer */
+	__u32			cpu;		/* current CPU */
+
+	/* 0 => preemptable, < 0 => BUG */
+	int			preempt_count;
+
+	/*
+	 * thread address space:
+	 * 0-0xBFFFFFFF for user-thead
+	 * 0-0xFFFFFFFF for kernel-thread
+	 */
+	mm_segment_t		addr_limit;
+	struct pt_regs		*regs;
+};
+
+/*
+ * macros/functions for gaining access to the thread information structure
+ *
+ * preempt_count needs to be 1 initially, until the scheduler is functional.
+ */
+#define INIT_THREAD_INFO(tsk)			\
+{						\
+	.task		= &tsk,			\
+	.cpu		= 0,			\
+	.preempt_count	= 1,			\
+	.addr_limit	= KERNEL_DS,		\
+}
+
+#define init_thread_info	(init_thread_union.thread_info)
+#define init_stack		(init_thread_union.stack)
+
+/* How to get the thread information struct from C. */
+register struct thread_info *__current_thread_info __asm__("r28");
+#define current_thread_info()	__current_thread_info
+
+#endif /* !__ASSEMBLY__ */
+
+/*
+ * thread information flags
+ * - these are process state flags that various assembly files may need to
+ *   access
+ * - pending work-to-be-done flags are in LSW
+ * - other flags in MSW
+ */
+#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
+#define TIF_SIGPENDING		1	/* signal pending */
+#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
+#define TIF_NOTIFY_RESUME	5	/* callback before returning to user */
+#define TIF_RESTORE_SIGMASK	9	/* restore signal mask in do_signal() */
+#define TIF_MEMDIE		18	/* is terminating due to OOM killer */
+
+#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
+#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
+#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
+#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
+
+#define _TIF_WORK_MASK		(0x0000ffff)
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_SCORE_THREAD_INFO_H */