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1 | # SPDX-License-Identifier: GPL-2.0 | |
2 | # | |
3 | # kbuild file for usr/ - including initramfs image | |
4 | # | |
5 | ||
6 | klibcdirs:; | |
7 | PHONY += klibcdirs | |
8 | ||
9 | suffix_y = $(subst $\",,$(CONFIG_INITRAMFS_COMPRESSION)) | |
10 | datafile_y = initramfs_data.cpio$(suffix_y) | |
11 | datafile_d_y = .$(datafile_y).d | |
12 | AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/$(datafile_y)" | |
13 | ||
14 | ||
15 | # Generate builtin.o based on initramfs_data.o | |
16 | obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o | |
17 | ||
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 | |
22 | ||
23 | ##### | |
24 | # Generate the initramfs cpio archive | |
25 | ||
26 | hostprogs-y := gen_init_cpio | |
27 | initramfs := $(CONFIG_SHELL) $(srctree)/$(src)/gen_initramfs_list.sh | |
28 | ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \ | |
29 | $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d) | |
30 | ramfs-args := \ | |
31 | $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \ | |
32 | $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) | |
33 | ||
34 | # $(datafile_d_y) is used to identify all files included | |
35 | # in initramfs and to detect if any files are added/removed. | |
36 | # Removed files are identified by directory timestamp being updated | |
37 | # The dependency list is generated by gen_initramfs.sh -l | |
38 | ifneq ($(wildcard $(obj)/$(datafile_d_y)),) | |
39 | include $(obj)/$(datafile_d_y) | |
40 | endif | |
41 | ||
42 | quiet_cmd_initfs = GEN $@ | |
43 | cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input) | |
44 | ||
45 | targets := $(datafile_y) | |
46 | ||
47 | # do not try to update files included in initramfs | |
48 | $(deps_initramfs): ; | |
49 | ||
50 | $(deps_initramfs): klibcdirs | |
51 | # We rebuild initramfs_data.cpio if: | |
52 | # 1) Any included file is newer than initramfs_data.cpio | |
53 | # 2) There are changes in which files are included (added or deleted) | |
54 | # 3) If gen_init_cpio are newer than initramfs_data.cpio | |
55 | # 4) Arguments to gen_initramfs.sh changes | |
56 | $(obj)/$(datafile_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs | |
57 | $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/$(datafile_d_y) | |
58 | $(call if_changed,initfs) |