LINUX_SERIES = 2.6
LINUX_VER    = 2.6.16
LINUX_SRCS = linux-2.6.16.tar.bz2

EXTRAVERSION ?= xen

LINUX_DIR    = linux-$(LINUX_VER)-$(EXTRAVERSION)

include buildconfigs/Rules.mk

# The real action starts here!
.PHONY: build
build: $(LINUX_DIR)/include/linux/autoconf.h
	if grep "^CONFIG_MODULES=" $(LINUX_DIR)/.config ; then \
	    $(MAKE) -C $(LINUX_DIR) ARCH=$(LINUX_ARCH) modules ; \
	    $(MAKE) -C $(LINUX_DIR) ARCH=$(LINUX_ARCH) INSTALL_MOD_PATH=$(DESTDIR) modules_install ; \
	fi
	$(MAKE) -C $(LINUX_DIR) ARCH=$(LINUX_ARCH) INSTALL_PATH=$(DESTDIR) vmlinuz
	$(MAKE) -C $(LINUX_DIR) ARCH=$(LINUX_ARCH) INSTALL_PATH=$(DESTDIR) install

$(LINUX_DIR)/include/linux/autoconf.h: ref-linux-$(LINUX_VER)/.valid-ref
	rm -rf $(LINUX_DIR)
	cp -al $(<D) $(LINUX_DIR)
	# Apply arch-xen patches
	( cd linux-$(LINUX_SERIES)-xen-sparse ; \
          LINUX_ARCH=$(LINUX_ARCH) ./mkbuildtree ../$(LINUX_DIR) )
	# Re-use config from install dir if one exits else use default config
	CONFIG_VERSION=$$(sed -ne 's/^EXTRAVERSION = //p' $(LINUX_DIR)/Makefile); \
	[ -r $(DESTDIR)/boot/config-$(LINUX_VER)$$CONFIG_VERSION-$(EXTRAVERSION) ] && \
	  cp $(DESTDIR)/boot/config-$(LINUX_VER)$$CONFIG_VERSION-$(EXTRAVERSION) $(LINUX_DIR)/.config \
	  || cp buildconfigs/linux-defconfig_$(EXTRAVERSION)_$(XEN_TARGET_ARCH)$(XEN_SYSTYPE) \
		$(LINUX_DIR)/.config
	# See if we need to munge config to enable PAE
	$(MAKE) CONFIG_FILE=$(LINUX_DIR)/.config -f buildconfigs/Rules.mk config-update-pae
	# Patch kernel Makefile to set EXTRAVERSION
	( cd $(LINUX_DIR) ; \
	  sed -e 's/^EXTRAVERSION.*/&$$(XENGUEST)\nXENGUEST = -$(EXTRAVERSION)/' Makefile >Mk.tmp ; \
	  rm -f Makefile ; mv Mk.tmp Makefile )
	$(MAKE) -C $(LINUX_DIR) ARCH=$(LINUX_ARCH) oldconfig

.PHONY: prep
prep: $(LINUX_DIR)/include/linux/autoconf.h

.PHONY: config
config: CONFIGMODE = menuconfig
config: $(LINUX_DIR)/include/linux/autoconf.h
	$(MAKE) -C $(LINUX_DIR) ARCH=$(LINUX_ARCH) $(CONFIGMODE)

.PHONY: clean
clean::
	$(MAKE) -C $(LINUX_DIR) ARCH=$(LINUX_ARCH) clean

.PHONY: delete
delete: 
	rm -rf tmp-linux-$(LINUX_VER) $(LINUX_DIR)