| # |
| # kbuild file for usr/ - including initramfs image and klibc |
| # |
| |
| CONFIG_KLIBC := 1 |
| |
| include-subdir := include |
| klibc-subdir := klibc |
| usr-subdirs := kinit utils dash gzip |
| subdir- := $(include-subdir) $(klibc-subdir) $(usr-subdirs) |
| |
| usr-subdirs := $(addprefix _usr_,$(usr-subdirs)) |
| klibc-subdir := $(addprefix _usr_,$(klibc-subdir)) |
| |
| # klibc binaries |
| ifdef CONFIG_KLIBC |
| |
| # .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 |
| |
| # build klibc library before the klibc programs |
| # build klibc programs before cpio.gz |
| .PHONY: initramfs $(usr-subdirs) $(klibc-subdir) $(include-subdir) |
| initramfs: $(usr-subdirs) $(klibc-subdir) $(include-subdir) |
| $(deps_initramfs): $(usr-subdirs) $(klibc-subdir) $(include-subdir) |
| |
| $(usr-subdirs): $(klibc-subdir) |
| $(Q)$(MAKE) $(klibc)=$(src)/$(patsubst _usr_%,%,$(@)) |
| |
| $(klibc-subdir): $(include-subdir) |
| $(Q)$(MAKE) $(klibc)=$(src)/$(patsubst _usr_%,%,$(@)) |
| |
| $(include-subdir): |
| $(Q)$(MAKE) $(klibc)=$(src)/$(patsubst _usr_%,%,$(@)) |
| endif |
| |
| |
| # 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 |
| ginitramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh |
| ramfs-def := $(srctree)/$(src)/initramfs.default |
| ramfs-input := $(shell echo $(CONFIG_INITRAMFS_SOURCE)) |
| ramfs-input := $(if $(ramfs-input), $(ramfs-input), $(ramfs-def)) |
| |
| ramfs-args := \ |
| $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \ |
| $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) |
| |
| quiet_cmd_initfs = GEN $@ |
| cmd_initfs = $(ginitramfs) -o $@ $(ramfs-args) $(ramfs-input) |
| |
| targets := initramfs_data.cpio.gz |
| # 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) initramfs |
| $(Q)$(ginitramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.gz.d |
| $(call if_changed,initfs) |
