1 # SPDX-License-Identifier: GPL-2.0
2 #
3 # kbuild file for usr/ - including initramfs i
4 #
5
6 compress-y
7 compress-$(CONFIG_INITRAMFS_COMPRESSION_GZIP)
8 compress-$(CONFIG_INITRAMFS_COMPRESSION_BZIP2)
9 compress-$(CONFIG_INITRAMFS_COMPRESSION_LZMA)
10 compress-$(CONFIG_INITRAMFS_COMPRESSION_XZ)
11 compress-$(CONFIG_INITRAMFS_COMPRESSION_LZO)
12 compress-$(CONFIG_INITRAMFS_COMPRESSION_LZ4)
13 compress-$(CONFIG_INITRAMFS_COMPRESSION_ZSTD)
14
15 obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data
16
17 $(obj)/initramfs_data.o: $(obj)/initramfs_inc_
18
19 ramfs-input := $(CONFIG_INITRAMFS_SOURCE)
20 cpio-data :=
21
22 # If CONFIG_INITRAMFS_SOURCE is empty, generat
23 # default contents.
24 ifeq ($(ramfs-input),)
25 ramfs-input := $(src)/default_cpio_list
26 endif
27
28 ifeq ($(words $(ramfs-input)),1)
29
30 # If CONFIG_INITRAMFS_SOURCE specifies a singl
31 # .cpio, use it directly as an initramfs.
32 ifneq ($(filter %.cpio,$(ramfs-input)),)
33 cpio-data := $(ramfs-input)
34 endif
35
36 # If CONFIG_INITRAMFS_SOURCE specifies a singl
37 # .cpio.*, use it directly as an initramfs, an
38 ifeq ($(words $(subst .cpio.,$(space),$(ramfs-
39 cpio-data := $(ramfs-input)
40 compress-y := copy
41 endif
42
43 endif
44
45 # For other cases, generate the initramfs cpio
46 # specified by CONFIG_INITRAMFS_SOURCE.
47 ifeq ($(cpio-data),)
48
49 cpio-data := $(obj)/initramfs_data.cpio
50
51 hostprogs := gen_init_cpio
52
53 # .initramfs_data.cpio.d is used to identify a
54 # in initramfs and to detect if any files are
55 # Removed files are identified by directory ti
56 # The dependency list is generated by gen_init
57 -include $(obj)/.initramfs_data.cpio.d
58
59 # do not try to update files included in initr
60 $(deps_initramfs): ;
61
62 quiet_cmd_initfs = GEN $@
63 cmd_initfs = \
64 $(CONFIG_SHELL) $< -o $@ -l $(obj)/.in
65 $(addprefix -u , $(CONFIG_INITRAMFS_RO
66 $(addprefix -g , $(CONFIG_INITRAMFS_RO
67 $(if $(KBUILD_BUILD_TIMESTAMP), -d "$(
68 $(ramfs-input)
69
70 # We rebuild initramfs_data.cpio if:
71 # 1) Any included file is newer than initramfs
72 # 2) There are changes in which files are incl
73 # 3) If gen_init_cpio are newer than initramfs
74 # 4) Arguments to gen_initramfs.sh changes
75 $(obj)/initramfs_data.cpio: $(src)/gen_initram
76 $(call if_changed,initfs)
77
78 endif
79
80 $(obj)/initramfs_inc_data: $(cpio-data) FORCE
81 $(call if_changed,$(compress-y))
82
83 targets += initramfs_data.cpio initramfs_inc_d
84
85 subdir-$(CONFIG_UAPI_HEADER_TEST) += include
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