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, 74 insertions, 0 deletions

diff --git a/kernel/arch/arm/nwfpe/fpmodule.inl b/kernel/arch/arm/nwfpe/fpmodule.inl
new file mode 100644
index 000000000..2c39ad408
--- /dev/null
+++ b/kernel/arch/arm/nwfpe/fpmodule.inl
@@ -0,0 +1,74 @@
+/*
+    NetWinder Floating Point Emulator
+    (c) Rebel.COM, 1998,1999
+
+    Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
+
+    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.
+
+    This program is distributed in the hope that 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+static inline unsigned long readRegister(const unsigned int nReg)
+{
+	/* Note: The CPU thinks it has dealt with the current instruction.
+	   As a result the program counter has been advanced to the next
+	   instruction, and points 4 bytes beyond the actual instruction
+	   that caused the invalid instruction trap to occur.  We adjust
+	   for this in this routine.  LDF/STF instructions with Rn = PC
+	   depend on the PC being correct, as they use PC+8 in their
+	   address calculations. */
+	struct pt_regs *regs = GET_USERREG();
+	unsigned int val = regs->uregs[nReg];
+	if (REG_PC == nReg)
+		val -= 4;
+	return val;
+}
+
+static inline void
+writeRegister(const unsigned int nReg, const unsigned long val)
+{
+	struct pt_regs *regs = GET_USERREG();
+	regs->uregs[nReg] = val;
+}
+
+static inline unsigned long readCPSR(void)
+{
+	return (readRegister(REG_CPSR));
+}
+
+static inline void writeCPSR(const unsigned long val)
+{
+	writeRegister(REG_CPSR, val);
+}
+
+static inline unsigned long readConditionCodes(void)
+{
+#ifdef __FPEM_TEST__
+	return (0);
+#else
+	return (readCPSR() & CC_MASK);
+#endif
+}
+
+static inline void writeConditionCodes(const unsigned long val)
+{
+	struct pt_regs *regs = GET_USERREG();
+	unsigned long rval;
+	/*
+	 * Operate directly on userRegisters since
+	 * the CPSR may be the PC register itself.
+	 */
+	rval = regs->ARM_cpsr & ~CC_MASK;
+	regs->ARM_cpsr = rval | (val & CC_MASK);
+}