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, 106 insertions, 0 deletions

diff --git a/kernel/arch/mips/math-emu/sp_tlong.c b/kernel/arch/mips/math-emu/sp_tlong.c
new file mode 100644
index 000000000..9f3c742c1
--- /dev/null
+++ b/kernel/arch/mips/math-emu/sp_tlong.c
@@ -0,0 +1,106 @@
+/* IEEE754 floating point arithmetic
+ * single precision
+ */
+/*
+ * MIPS floating point support
+ * Copyright (C) 1994-2000 Algorithmics Ltd.
+ *
+ *  This program is free software; you can distribute it and/or modify it
+ *  under the terms 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.,
+ *  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA.
+ */
+
+#include "ieee754sp.h"
+#include "ieee754dp.h"
+
+s64 ieee754sp_tlong(union ieee754sp x)
+{
+	u32 residue;
+	int round;
+	int sticky;
+	int odd;
+
+	COMPXDP;		/* <-- need 64-bit mantissa tmp */
+
+	ieee754_clearcx();
+
+	EXPLODEXSP;
+	FLUSHXSP;
+
+	switch (xc) {
+	case IEEE754_CLASS_SNAN:
+	case IEEE754_CLASS_QNAN:
+	case IEEE754_CLASS_INF:
+		ieee754_setcx(IEEE754_INVALID_OPERATION);
+		return ieee754di_indef();
+
+	case IEEE754_CLASS_ZERO:
+		return 0;
+
+	case IEEE754_CLASS_DNORM:
+	case IEEE754_CLASS_NORM:
+		break;
+	}
+	if (xe >= 63) {
+		/* look for valid corner case */
+		if (xe == 63 && xs && xm == SP_HIDDEN_BIT)
+			return -0x8000000000000000LL;
+		/* Set invalid. We will only use overflow for floating
+		   point overflow */
+		ieee754_setcx(IEEE754_INVALID_OPERATION);
+		return ieee754di_indef();
+	}
+	/* oh gawd */
+	if (xe > SP_FBITS) {
+		xm <<= xe - SP_FBITS;
+	} else if (xe < SP_FBITS) {
+		if (xe < -1) {
+			residue = xm;
+			round = 0;
+			sticky = residue != 0;
+			xm = 0;
+		} else {
+			residue = xm << (32 - SP_FBITS + xe);
+			round = (residue >> 31) != 0;
+			sticky = (residue << 1) != 0;
+			xm >>= SP_FBITS - xe;
+		}
+		odd = (xm & 0x1) != 0x0;
+		switch (ieee754_csr.rm) {
+		case FPU_CSR_RN:
+			if (round && (sticky || odd))
+				xm++;
+			break;
+		case FPU_CSR_RZ:
+			break;
+		case FPU_CSR_RU:	/* toward +Infinity */
+			if ((round || sticky) && !xs)
+				xm++;
+			break;
+		case FPU_CSR_RD:	/* toward -Infinity */
+			if ((round || sticky) && xs)
+				xm++;
+			break;
+		}
+		if ((xm >> 63) != 0) {
+			/* This can happen after rounding */
+			ieee754_setcx(IEEE754_INVALID_OPERATION);
+			return ieee754di_indef();
+		}
+		if (round || sticky)
+			ieee754_setcx(IEEE754_INEXACT);
+	}
+	if (xs)
+		return -xm;
+	else
+		return xm;
+}