1 # SPDX-License-Identifier: GPL-2.0
3 # kbuild file for usr/ - including initramfs image
6 suffix_y = $(subst $\",,$(CONFIG_INITRAMFS_COMPRESSION))
7 datafile_y = initramfs_data.cpio$(suffix_y)
8 datafile_d_y = .$(datafile_y).d
9 AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/$(datafile_y)"
11 # clean rules do not have CONFIG_INITRAMFS_COMPRESSION. So clean up after all
12 # possible compression formats.
13 clean-files += initramfs_data.cpio*
15 # Generate builtin.o based on initramfs_data.o
16 obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
18 # initramfs_data.o contains the compressed initramfs_data.cpio image.
19 # The image is included using .incbin, a dependency which is not
20 # tracked automatically.
21 $(obj)/initramfs_data.o: $(obj)/$(datafile_y) FORCE
24 # Generate the initramfs cpio archive
26 hostprogs-y := gen_init_cpio
27 ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
28 $(shell echo $(CONFIG_INITRAMFS_SOURCE)),$(srctree)/$(src)/default_cpio_list)
30 $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
31 $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
33 # $(datafile_d_y) is used to identify all files included
34 # in initramfs and to detect if any files are added/removed.
35 # Removed files are identified by directory timestamp being updated
36 # The dependency list is generated by gen_initramfs.sh -l
37 ifneq ($(wildcard $(obj)/$(datafile_d_y)),)
38 include $(obj)/$(datafile_d_y)
41 quiet_cmd_initfs = GEN $@
42 cmd_initfs = $(CONFIG_SHELL) $< -o $@ -l $(obj)/$(datafile_d_y) $(ramfs-args) $(ramfs-input)
44 targets := $(datafile_y)
46 # do not try to update files included in initramfs
49 # We rebuild initramfs_data.cpio if:
50 # 1) Any included file is newer than initramfs_data.cpio
51 # 2) There are changes in which files are included (added or deleted)
52 # 3) If gen_init_cpio are newer than initramfs_data.cpio
53 # 4) Arguments to gen_initramfs.sh changes
54 $(obj)/$(datafile_y): $(src)/gen_initramfs.sh $(obj)/gen_init_cpio $(deps_initramfs) FORCE
55 $(call if_changed,initfs)
57 subdir-$(CONFIG_UAPI_HEADER_TEST) += include