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/xtensa/Makefile b/kernel/arch/xtensa/Makefile
new file mode 100644
index 000000000..f9e6a068a
--- /dev/null
+++ b/kernel/arch/xtensa/Makefile
@@ -0,0 +1,106 @@
+#
+# This file is subject to the terms and conditions of the GNU General Public
+# License.  See the file "COPYING" in the main directory of this archive
+# for more details.
+#
+# Copyright (C) 2001 - 2005  Tensilica Inc.
+# Copyright (C) 2014 Cadence Design Systems Inc.
+#
+# This file is included by the global makefile so that you can add your own
+# architecture-specific flags and dependencies. Remember to do have actions
+# for "archclean" and "archdep" for cleaning up and making dependencies for
+# this architecture
+
+# Core configuration.
+# (Use VAR=<xtensa_config> to use another default compiler.)
+
+variant-y := $(patsubst "%",%,$(CONFIG_XTENSA_VARIANT_NAME))
+
+VARIANT = $(variant-y)
+export VARIANT
+
+# Test for cross compiling
+
+ifneq ($(VARIANT),)
+  COMPILE_ARCH = $(shell uname -m)
+
+  ifneq ($(COMPILE_ARCH), xtensa)
+    ifndef CROSS_COMPILE
+      CROSS_COMPILE = xtensa_$(VARIANT)-
+    endif
+  endif
+endif
+
+# Platform configuration
+
+platform-$(CONFIG_XTENSA_PLATFORM_XT2000)	:= xt2000
+platform-$(CONFIG_XTENSA_PLATFORM_ISS)		:= iss
+platform-$(CONFIG_XTENSA_PLATFORM_XTFPGA)	:= xtfpga
+
+PLATFORM = $(platform-y)
+export PLATFORM
+
+# temporarily until string.h is fixed
+KBUILD_CFLAGS += -ffreestanding -D__linux__
+
+KBUILD_CFLAGS += -pipe -mlongcalls
+
+KBUILD_CFLAGS += $(call cc-option,-mforce-no-pic,)
+
+ifneq ($(CONFIG_LD_NO_RELAX),)
+LDFLAGS := --no-relax
+endif
+
+ifeq ($(shell echo __XTENSA_EB__ | $(CC) -E - | grep -v "\#"),1)
+CHECKFLAGS += -D__XTENSA_EB__
+endif
+ifeq ($(shell echo __XTENSA_EL__ | $(CC) -E - | grep -v "\#"),1)
+CHECKFLAGS += -D__XTENSA_EL__
+endif
+
+vardirs := $(patsubst %,arch/xtensa/variants/%/,$(variant-y))
+plfdirs := $(patsubst %,arch/xtensa/platforms/%/,$(platform-y))
+
+ifeq ($(KBUILD_SRC),)
+KBUILD_CPPFLAGS += $(patsubst %,-I%include,$(vardirs) $(plfdirs))
+else
+KBUILD_CPPFLAGS += $(patsubst %,-I$(srctree)/%include,$(vardirs) $(plfdirs))
+endif
+
+KBUILD_DEFCONFIG := iss_defconfig
+
+# Only build variant and/or platform if it includes a Makefile
+
+buildvar := $(shell test -e $(srctree)/arch/xtensa/variants/$(VARIANT)/Makefile && echo arch/xtensa/variants/$(VARIANT)/)
+buildplf := $(shell test -e $(srctree)/arch/xtensa/platforms/$(PLATFORM)/Makefile && echo arch/xtensa/platforms/$(PLATFORM)/)
+
+# Find libgcc.a
+
+LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name)
+
+head-y		:= arch/xtensa/kernel/head.o
+core-y		+= arch/xtensa/kernel/ arch/xtensa/mm/
+core-y		+= $(buildvar) $(buildplf)
+
+libs-y		+= arch/xtensa/lib/ $(LIBGCC)
+drivers-$(CONFIG_OPROFILE)	+= arch/xtensa/oprofile/
+
+ifneq ($(CONFIG_BUILTIN_DTB),"")
+core-$(CONFIG_OF) += arch/xtensa/boot/dts/
+endif
+
+boot		:= arch/xtensa/boot
+
+all: zImage
+
+bzImage : zImage
+
+zImage: vmlinux
+	$(Q)$(MAKE) $(build)=$(boot) $@
+
+%.dtb:
+	$(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
+
+define archhelp
+  @echo '* zImage      - Compressed kernel image (arch/xtensa/boot/images/zImage.*)'
+endef