Build system: Initial support of linux kernel image build

Signed-off-by: Abdoulaye Walsimou Gaye <awg@embtoolkit.org>

3 files changed, 139 insertions, 2 deletions

diff --git a/Kconfig b/Kconfig
index 911b639..890a1bc 100644
--- a/Kconfig
+++ b/Kconfig
@@ -1,6 +1,6 @@
 ################################################################################
 # Abdoulaye Walsimou GAYE <awg@embtoolkit.org>
-# Copyright(C) 2009-2012 Abdoulaye Walsimou GAYE.
+# Copyright(C) 2009-2013 Abdoulaye Walsimou GAYE.
 #
 # 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
@@ -74,6 +74,16 @@ menu "Embtoolkit build options and host tools"
 source kconfig/hosttools-buildopts.kconfig
 endmenu
 
+if EMBTK_OS_LINUX
+config EMBTK_BUILD_LINUX_KERNEL
+	bool "Build linux kernel image"
+
+if EMBTK_BUILD_LINUX_KERNEL
+source kconfig/linux-kernel-build.kconfig
+endif
+
+endif
+
 config EMBTK_HAVE_ROOTFS
 	bool "Build root filesystem"
 	help
diff --git a/kconfig/linux-kernel-build.kconfig b/kconfig/linux-kernel-build.kconfig
new file mode 100644
index 0000000..24a8749
--- /dev/null
+++ b/kconfig/linux-kernel-build.kconfig
@@ -0,0 +1,57 @@
+################################################################################
+# EmbToolkit
+# Copyright(C) 2013 Abdoulaye Walsimou GAYE.
+#
+# 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, see <http://www.gnu.org/licenses/>.
+#
+################################################################################
+#
+# \file         Kconfig
+# \brief	linux kernel build options
+# \author       Abdoulaye Walsimou GAYE <awg@embtoolkit.org>
+# \date         May 2013
+################################################################################
+
+menu "Linux kernel Image configuration"
+
+config EMBTK_LINUX_DOTCONFIG
+	string "Linux kernel config file"
+	help
+	 Please specify the linux kernel configuration file for
+	 your target/board.
+
+choice
+	prompt "Linux source tree to use"
+	help
+	 Specify which linux source tree to use.
+
+	config EMBTK_LINUX_BUILD_TOOLCHAIN_SRC
+		bool "The same used to build the toolchain"
+		help
+		 Select this option to use the same linux source tree used to
+		 build the toolchain.
+
+	config EMBTK_LINUX_BUILD_USE_EXTSRC
+		bool "The same used to build the toolchain"
+		help
+		 Select this option to use an external linux source tree.
+endchoice
+
+config EMBTK_LINUX_BUILD_EXTSRC
+	string "External linux source tree path"
+	depends on EMBTK_LINUX_BUILD_USE_EXTSRC
+	help
+	 Please specify your external linux source tree path.
+
+endmenu
diff --git a/mk/linux.mk b/mk/linux.mk
index 0b7d6df..5415cbb 100644
--- a/mk/linux.mk
+++ b/mk/linux.mk
@@ -1,6 +1,6 @@
 #################################################################################
 # Embtoolkit
-# Copyright(C) 2009-2011 Abdoulaye Walsimou GAYE.
+# Copyright(C) 2009-2013 Abdoulaye Walsimou GAYE.
 #
 # 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
@@ -63,6 +63,76 @@ define embtk_install_linux_headers
 endef
 
 #
+# linux install macros
+#
+__embtk_linux_dotconfig_f	:= $(call __embtk_mk_uquote,$(CONFIG_EMBTK_LINUX_DOTCONFIG))
+__embtk_linux_srcdir		:= $(call __embtk_mk_uquote,$(or $(CONFIG_EMBTK_LINUX_BUILD_EXTSRC),$(LINUX_SRC_DIR)))
+__embtk_linux_support_modules	:= $(shell grep MODULES=y "$(__embtk_linux_dotconfig_f)" 2>/dev/null)
+
+define __embtk_install_linux_modules
+	$(MAKE) -C $(__embtk_linux_srcdir) quiet=quiet_				\
+		INSTALL_MOD_PATH=$(embtk_rootfs)				\
+		ARCH=$(LINUX_ARCH)						\
+		CROSS_COMPILE=$(CROSS_COMPILE_CACHED) modules_install
+endef
+
+define __embtk_install_linux_check_config
+	if [ "x" = "x$(__embtk_linux_dotconfig_f)" ]; then			\
+	$(call embtk_perror,"Unable to build linux kernel image: no config file");\
+	exit 1;									\
+	fi
+	if [ ! -e $(__embtk_linux_dotconfig_f) ]; then				\
+	$(call embtk_perror,"Unable to build linux kernel image: config file $(__embtk_linux_dotconfig_f) not found");\
+	exit 1;									\
+	fi
+endef
+
+define __embtk_install_linux_check_extsrc
+	if [ "x" = "x$(__embtk_linux_srcdir)" ]; then				\
+	$(call embtk_perror,"Unable to build linux kernel image: External source tree not specified");\
+	exit 1;									\
+	fi
+	if [ ! -d $(__embtk_linux_srcdir) ]; then				\
+	$(call embtk_perror,"Unable to build linux kernel image: External source tree $(__embtk_linux_srcdir) not found");\
+	exit 1;									\
+	fi
+endef
+
+define __embtk_install_linux
+	$(call embtk_pinfo,"Generating linux kernel image...")
+	$(__embtk_install_linux_check_config)
+	$(if $(CONFIG_EMBTK_LINUX_BUILD_USE_EXTSRC),
+		$(__embtk_install_linux_check_extsrc))
+	$(if $(CONFIG_EMBTK_LINUX_BUILD_TOOLCHAIN_SRC),
+		$(call embtk_download_pkg,linux)
+		$(call embtk_decompress_pkg,linux))
+	$(MAKE) -C $(__embtk_linux_srcdir)					\
+		ARCH=$(LINUX_ARCH)						\
+		CROSS_COMPILE=$(CROSS_COMPILE_CACHED) distclean
+	rm -rf $(__embtk_linux_srcdir)/.config
+	cp $(CONFIG_EMBTK_LINUX_DOTCONFIG) $(__embtk_linux_srcdir)/.config
+	$(MAKE) -C $(__embtk_linux_srcdir) quiet=quiet_				\
+		ARCH=$(LINUX_ARCH)						\
+		CROSS_COMPILE=$(CROSS_COMPILE_CACHED) silentoldconfig
+	$(MAKE) -C $(__embtk_linux_srcdir) quiet=quiet_				\
+		ARCH=$(LINUX_ARCH)						\
+		CROSS_COMPILE=$(CROSS_COMPILE_CACHED) $(J)
+	touch $(call __embtk_pkg_dotinstalled_f,linux)
+	$(call __embtk_pkg_gen_dotkconfig_f,linux)
+endef
+
+define embtk_install_linux
+	$(if $(call __embtk_pkg_installed-y,linux),true,$(__embtk_install_linux))
+	$(if $(__embtk_linux_support_modules),
+		$(embtk_postinstall_linux))
+endef
+
+define embtk_postinstall_linux
+	$(call embtk_pinfo,"Install linux kernel modules...")
+	$(__embtk_install_linux_modules)
+endef
+
+#
 # clean target and macros
 #
 define embtk_cleanup_linux