| # |
| # kbuild file for usr/ - including initramfs image and klibc |
| # |
| |
| # klibc definitions - to be moved to top-level Makefile later |
| export KLIBCSRC := $(srctree)/$(src)/klibc |
| export KLIBCINC := $(srctree)/$(src)/include |
| export KLIBCOBJ := $(objtree)/$(obj)/klibc |
| CONFIG_KLIBC := 1 |
| |
| # Klibc binaries |
| ifdef CONFIG_KLIBC |
| klibc := -f $(srctree)/scripts/Kbuild.klibc obj |
| |
| .PHONY: klibcdirs |
| $(obj)/initramfs_list: klibcdirs |
| |
| klibcdirs: FORCE |
| $(Q)$(MAKE) $(klibc)=$(src)/klibc |
| $(Q)$(MAKE) $(klibc)=$(src)/kinit |
| $(Q)$(MAKE) $(klibc)=$(src)/utils |
| $(Q)$(MAKE) $(klibc)=$(src)/dash |
| $(Q)$(MAKE) $(klibc)=$(src)/gzip |
| endif |
| subdir- := klibc kinit utils dash gzip |
| |
| # Generate builtin.o based on initramfs_data.o |
| obj-y := initramfs_data.o |
| |
| # initramfs_data.o contains the initramfs_data.cpio.gz image. |
| # The image is included using .incbin, a dependency which is not |
| # tracked automatically. |
| $(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio.gz FORCE |
| |
| ##### |
| # Generate the initramfs cpio archive |
| |
| hostprogs-y := gen_init_cpio |
| initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh |
| ramfs-input := $(shell echo $(CONFIG_INITRAMFS_SOURCE)) |
| ramfs-input := $(if $(ramfs-input), $(ramfs-input), -d) |
| |
| ramfs-args := \ |
| $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \ |
| $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) \ |
| $(ramfs-input) |
| |
| # .initramfs_data.cpio.gz.d is used to identify all files included |
| # in initramfs and to detect if any files are added/removed. |
| # Removed files are identified by directory timestamp being updated |
| # The dependency list is generated by gen_initramfs.sh -l |
| ifneq ($(wildcard $(obj)/.initramfs_data.cpio.gz.d),) |
| include $(obj)/.initramfs_data.cpio.gz.d |
| endif |
| |
| quiet_cmd_initfs = GEN $@ |
| cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input) |
| |
| targets := initramfs_data.cpio.gz |
| $(deps_initramfs): klibcdirs |
| # We rebuild initramfs_data.cpio.gz if: |
| # 1) Any included file is newer then initramfs_data.cpio.gz |
| # 2) There are changes in which files are included (added or deleted) |
| # 3) If gen_init_cpio are newer than initramfs_data.cpio.gz |
| # 4) arguments to gen_initramfs.sh changes |
| $(obj)/initramfs_data.cpio.gz: $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs |
| $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.gz.d |
| $(call if_changed,initfs) |
| |