Kbuild Makefile mechanism for samples and projects.

This commit adds the capability to the Kbuild system of adding
samples and projects to the build process.
This commits adds the hello_world and philosophers sample code
as an example of how to configure a project into the build
system.
The project can be hosted inside the kernel source tree or
outside the kernel source tree.

Signed-off-by: Juan Manuel Cruz <juan.m.cruz.alcaraz@linux.intel.com>
Change-Id: Id980e959ac6e0061f8227d5d81191a169bfc8fc3

Makefile.inc

@@ -0,0 +1,31 @@
+PROJECT_BASE = $(shell pwd)
+ARCH?=x86
+
+export ARCH CFLAGS LDFLAGS KBUILD_DEFCONFIG
+
+all: FORCE
+	$(Q)$(MAKE) -C $(TIMO_BASE)  O=$(PROJECT_BASE) \
+	PROJECT=$(PROJECT_BASE) VPFILE=$(VPFILE)
+
+rm-files:= final-linker.cmd linker.cmd modules.order \
+	staticIdt.o System.map tinymountain.lnk \
+	tinymountain.map tinymountain.elf
+rm-dirs := arch drivers include kernel lib misc \
+	scripts source
+
+clean: FORCE
+	$(shell rm $(rm-files))
+	$(shell rm $(rm-dirs) -r)
+
+mrproper: clean
+	$(Q)$(MAKE) -C $(TIMO_BASE) \
+	PROJECT=$(PROJECT_BASE) VPFILE=$(VPFILE) mrproper
+
+%config: FORCE
+	$(Q)$(MAKE) -C $(TIMO_BASE) O=$(PROJECT_BASE) \
+	PROJECT=$(PROJECT_BASE) VPFILE=$(VPFILE) $@
+
+PHONY += FORCE
+FORCE:
+
+.PHONY: $(PHONY)

misc/generated/Makefile

@@ -1,2 +1,2 @@
 obj-y = configs.o
-obj-$(CONFIG_MICROKERNEL) += nodes/
+obj-$(SYSGEN_EXEC) += nodes/

samples/microkernel/apps/hello_world/Makefile.kbuild

@@ -0,0 +1,4 @@
+TIMO_BASE = $(strip $(subst /samples/microkernel/apps/hello_world,,$(shell pwd) ))
+VPFILE ?= prj.vpf
+
+include ${TIMO_BASE}/Makefile.inc

samples/microkernel/apps/hello_world/src/Makefile

@@ -0,0 +1,3 @@
+EXTRA_CFLAGS += ${PROJECTINCLUDE}
+
+obj-y = hello.o

samples/microkernel/apps/philosophers/Makefile.kbuild

@@ -0,0 +1,4 @@
+TIMO_BASE = $(strip $(subst /samples/microkernel/apps/philosophers,,$(shell pwd) ))
+VPFILE ?= prj.vpf
+
+include ${TIMO_BASE}/Makefile.inc

samples/microkernel/apps/philosophers/src/Makefile

@@ -0,0 +1,3 @@
+EXTRA_CFLAGS += ${PROJECTINCLUDE}
+
+lib-y =  phil_fiber.o phil_task.o

samples/nanokernel/apps/hello_world/Makefile.kbuild

@@ -0,0 +1,4 @@
+TIMO_BASE = $(strip $(subst /samples/nanokernel/apps/hello_world,,$(shell pwd) ))
+VPFILE ?= prj.vpf
+
+include ${TIMO_BASE}/Makefile.inc

samples/nanokernel/apps/philosophers/Makefile.kbuild

@@ -0,0 +1,4 @@
+TIMO_BASE = $(strip $(subst /samples/nanokernel/apps/philosophers,,$(shell pwd) ))
+VPFILE ?= prj.vpf
+
+include ${TIMO_BASE}/Makefile.inc