1 # SPDX-License-Identifier: GPL-2.0 <<
2 # 1 #
3 # kbuild file for usr/ - including initramfs i 2 # kbuild file for usr/ - including initramfs image
4 # 3 #
5 4
6 compress-y !! 5 klibcdirs:;
7 compress-$(CONFIG_INITRAMFS_COMPRESSION_GZIP) !! 6 PHONY += klibcdirs
8 compress-$(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-$(CONFIG_INITRAMFS_COMPRESSION_ZSTD) <<
14 7
15 obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data <<
16 8
17 $(obj)/initramfs_data.o: $(obj)/initramfs_inc_ !! 9 # Bzip2
>> 10 suffix_$(CONFIG_RD_BZIP2) = .bz2
18 11
19 ramfs-input := $(CONFIG_INITRAMFS_SOURCE) !! 12 # Lzma
20 cpio-data := !! 13 suffix_$(CONFIG_RD_LZMA) = .lzma
21 14
22 # If CONFIG_INITRAMFS_SOURCE is empty, generat !! 15 # XZ
23 # default contents. !! 16 suffix_$(CONFIG_RD_XZ) = .xz
24 ifeq ($(ramfs-input),) <<
25 ramfs-input := $(src)/default_cpio_list <<
26 endif <<
27 17
28 ifeq ($(words $(ramfs-input)),1) !! 18 # Lzo
>> 19 suffix_$(CONFIG_RD_LZO) = .lzo
29 20
30 # If CONFIG_INITRAMFS_SOURCE specifies a singl !! 21 # Lz4
31 # .cpio, use it directly as an initramfs. !! 22 suffix_$(CONFIG_RD_LZ4) = .lz4
32 ifneq ($(filter %.cpio,$(ramfs-input)),) <<
33 cpio-data := $(ramfs-input) <<
34 endif <<
35 23
36 # If CONFIG_INITRAMFS_SOURCE specifies a singl !! 24 # Gzip
37 # .cpio.*, use it directly as an initramfs, an !! 25 suffix_$(CONFIG_RD_GZIP) = .gz
38 ifeq ($(words $(subst .cpio.,$(space),$(ramfs- <<
39 cpio-data := $(ramfs-input) <<
40 compress-y := copy <<
41 endif <<
42 26
43 endif !! 27 AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/initramfs_data.cpio$(suffix_y)"
44 28
45 # For other cases, generate the initramfs cpio !! 29 # Generate builtin.o based on initramfs_data.o
46 # specified by CONFIG_INITRAMFS_SOURCE. !! 30 obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
47 ifeq ($(cpio-data),) <<
48 <<
49 cpio-data := $(obj)/initramfs_data.cpio <<
50 31
51 hostprogs := gen_init_cpio !! 32 # initramfs_data.o contains the compressed initramfs_data.cpio image.
>> 33 # The image is included using .incbin, a dependency which is not
>> 34 # tracked automatically.
>> 35 $(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio$(suffix_y) FORCE
>> 36
>> 37 #####
>> 38 # Generate the initramfs cpio archive
>> 39
>> 40 hostprogs-y := gen_init_cpio
>> 41 initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
>> 42 ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
>> 43 $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
>> 44 ramfs-args := \
>> 45 $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
>> 46 $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
52 47
53 # .initramfs_data.cpio.d is used to identify a 48 # .initramfs_data.cpio.d is used to identify all files included
54 # in initramfs and to detect if any files are 49 # in initramfs and to detect if any files are added/removed.
55 # Removed files are identified by directory ti 50 # Removed files are identified by directory timestamp being updated
56 # The dependency list is generated by gen_init 51 # The dependency list is generated by gen_initramfs.sh -l
57 -include $(obj)/.initramfs_data.cpio.d !! 52 ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),)
>> 53 include $(obj)/.initramfs_data.cpio.d
>> 54 endif
58 55
>> 56 quiet_cmd_initfs = GEN $@
>> 57 cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
>> 58
>> 59 targets := initramfs_data.cpio.gz initramfs_data.cpio.bz2 \
>> 60 initramfs_data.cpio.lzma initramfs_data.cpio.xz \
>> 61 initramfs_data.cpio.lzo initramfs_data.cpio.lz4 \
>> 62 initramfs_data.cpio
59 # do not try to update files included in initr 63 # do not try to update files included in initramfs
60 $(deps_initramfs): ; 64 $(deps_initramfs): ;
61 65
62 quiet_cmd_initfs = GEN $@ !! 66 $(deps_initramfs): klibcdirs
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: 67 # We rebuild initramfs_data.cpio if:
71 # 1) Any included file is newer than initramfs !! 68 # 1) Any included file is newer then initramfs_data.cpio
72 # 2) There are changes in which files are incl 69 # 2) There are changes in which files are included (added or deleted)
73 # 3) If gen_init_cpio are newer than initramfs 70 # 3) If gen_init_cpio are newer than initramfs_data.cpio
74 # 4) Arguments to gen_initramfs.sh changes !! 71 # 4) arguments to gen_initramfs.sh changes
75 $(obj)/initramfs_data.cpio: $(src)/gen_initram !! 72 $(obj)/initramfs_data.cpio$(suffix_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
>> 73 $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d
76 $(call if_changed,initfs) 74 $(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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