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1# SPDX-License-Identifier: GPL-2.0
2#
3# kbuild file for usr - including initramfs image
4#
5
6klibcdirs:;
7PHONY += klibcdirs
8
9suffix_y = $(subst $\",,$(CONFIG_INITRAMFS_COMPRESSION))
10datafile_y = initramfs_data.cpio$(suffix_y)
11datafile_d_y = .$(datafile_y).d
12AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/$(datafile_y)"
13
14# clean rules do not have CONFIG_INITRAMFS_COMPRESSION. So clean up after all
15# possible compression formats.
16clean-files += initramfs_data.cpio*
17
18# Generate builtin.o based on initramfs_data.o
19obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
20
21# initramfs_data.o contains the compressed initramfs_data.cpio image.
22# The image is included using .incbin, a dependency which is not
23# tracked automatically.
24$(obj)/initramfs_data.o: $(obj)/$(datafile_y) FORCE
25
26#####
27# Generate the initramfs cpio archive
28
29hostprogs-y := gen_init_cpio
30initramfs := $(CONFIG_SHELL) $(srctree)/$(src)/gen_initramfs_list.sh
31ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
32 $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
33ramfs-args := \
34 $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
35 $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
36
37# $(datafile_d_y) is used to identify all files included
38# in initramfs and to detect if any files are added/removed.
39# Removed files are identified by directory timestamp being updated
40# The dependency list is generated by gen_initramfs.sh -l
41ifneq ($(wildcard $(obj)/$(datafile_d_y)),)
42 include $(obj)/$(datafile_d_y)
43endif
44
45quiet_cmd_initfs = GEN $@
46 cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
47
48targets := $(datafile_y)
49
50# do not try to update files included in initramfs
51$(deps_initramfs): ;
52
53$(deps_initramfs): klibcdirs
54# We rebuild initramfs_data.cpio if:
55# 1) Any included file is newer than initramfs_data.cpio
56# 2) There are changes in which files are included (added or deleted)
57# 3) If gen_init_cpio are newer than initramfs_data.cpio
58# 4) Arguments to gen_initramfs.sh changes
59$(obj)/$(datafile_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
60 $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/$(datafile_d_y)
61 $(call if_changed,initfs)
62
63subdir-$(CONFIG_UAPI_HEADER_TEST) += include
1# SPDX-License-Identifier: GPL-2.0
2#
3# kbuild file for usr - including initramfs image
4#
5
6# cmd_bzip2, cmd_lzma, cmd_lzo, cmd_lz4 from scripts/Makefile.lib appends the
7# size at the end of the compressed file, which unfortunately does not work
8# with unpack_to_rootfs(). Make size_append no-op.
9override size_append := :
10
11compress-y := shipped
12compress-$(CONFIG_INITRAMFS_COMPRESSION_GZIP) := gzip
13compress-$(CONFIG_INITRAMFS_COMPRESSION_BZIP2) := bzip2
14compress-$(CONFIG_INITRAMFS_COMPRESSION_LZMA) := lzma
15compress-$(CONFIG_INITRAMFS_COMPRESSION_XZ) := xzmisc
16compress-$(CONFIG_INITRAMFS_COMPRESSION_LZO) := lzo
17compress-$(CONFIG_INITRAMFS_COMPRESSION_LZ4) := lz4
18compress-$(CONFIG_INITRAMFS_COMPRESSION_ZSTD) := zstd
19
20obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
21
22$(obj)/initramfs_data.o: $(obj)/initramfs_inc_data
23
24ramfs-input := $(strip $(shell echo $(CONFIG_INITRAMFS_SOURCE)))
25cpio-data :=
26
27# If CONFIG_INITRAMFS_SOURCE is empty, generate a small initramfs with the
28# default contents.
29ifeq ($(ramfs-input),)
30ramfs-input := $(srctree)/$(src)/default_cpio_list
31endif
32
33ifeq ($(words $(ramfs-input)),1)
34
35# If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with
36# .cpio, use it directly as an initramfs.
37ifneq ($(filter %.cpio,$(ramfs-input)),)
38cpio-data := $(ramfs-input)
39endif
40
41# If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with
42# .cpio.*, use it directly as an initramfs, and avoid double compression.
43ifeq ($(words $(subst .cpio.,$(space),$(ramfs-input))),2)
44cpio-data := $(ramfs-input)
45compress-y := shipped
46endif
47
48endif
49
50# For other cases, generate the initramfs cpio archive based on the contents
51# specified by CONFIG_INITRAMFS_SOURCE.
52ifeq ($(cpio-data),)
53
54cpio-data := $(obj)/initramfs_data.cpio
55
56hostprogs := gen_init_cpio
57
58# .initramfs_data.cpio.d is used to identify all files included
59# in initramfs and to detect if any files are added/removed.
60# Removed files are identified by directory timestamp being updated
61# The dependency list is generated by gen_initramfs.sh -l
62-include $(obj)/.initramfs_data.cpio.d
63
64# do not try to update files included in initramfs
65$(deps_initramfs): ;
66
67quiet_cmd_initfs = GEN $@
68 cmd_initfs = \
69 $(CONFIG_SHELL) $< -o $@ -l $(obj)/.initramfs_data.cpio.d \
70 $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
71 $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) \
72 $(ramfs-input)
73
74# We rebuild initramfs_data.cpio if:
75# 1) Any included file is newer than initramfs_data.cpio
76# 2) There are changes in which files are included (added or deleted)
77# 3) If gen_init_cpio are newer than initramfs_data.cpio
78# 4) Arguments to gen_initramfs.sh changes
79$(obj)/initramfs_data.cpio: $(src)/gen_initramfs.sh $(obj)/gen_init_cpio $(deps_initramfs) FORCE
80 $(call if_changed,initfs)
81
82endif
83
84$(obj)/initramfs_inc_data: $(cpio-data) FORCE
85 $(call if_changed,$(compress-y))
86
87targets += initramfs_data.cpio initramfs_inc_data
88
89subdir-$(CONFIG_UAPI_HEADER_TEST) += include