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-$(CONFIG_INITRAMFS_COMPRESSION_ZSTD) <<
14 <<
15 obj-$(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 := $(src)/default_cpio_list <<
26 endif <<
27 7
28 ifeq ($(words $(ramfs-input)),1) <<
29 8
30 # If CONFIG_INITRAMFS_SOURCE specifies a singl !! 9 # Gzip
31 # .cpio, use it directly as an initramfs. !! 10 suffix_$(CONFIG_INITRAMFS_COMPRESSION_GZIP) = .gz
32 ifneq ($(filter %.cpio,$(ramfs-input)),) <<
33 cpio-data := $(ramfs-input) <<
34 endif <<
35 11
36 # If CONFIG_INITRAMFS_SOURCE specifies a singl !! 12 # Bzip2
37 # .cpio.*, use it directly as an initramfs, an !! 13 suffix_$(CONFIG_INITRAMFS_COMPRESSION_BZIP2) = .bz2
38 ifeq ($(words $(subst .cpio.,$(space),$(ramfs- <<
39 cpio-data := $(ramfs-input) <<
40 compress-y := copy <<
41 endif <<
42 14
43 endif !! 15 # Lzma
>> 16 suffix_$(CONFIG_INITRAMFS_COMPRESSION_LZMA) = .lzma
44 17
45 # For other cases, generate the initramfs cpio !! 18 # Generate builtin.o based on initramfs_data.o
46 # specified by CONFIG_INITRAMFS_SOURCE. !! 19 obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data$(suffix_y).o
47 ifeq ($(cpio-data),) <<
48 20
49 cpio-data := $(obj)/initramfs_data.cpio !! 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 $(obj)/initramfs_data$(suffix_y).o: $(obj)/initramfs_data.cpio$(suffix_y) FORCE
50 25
51 hostprogs := gen_init_cpio !! 26 #####
>> 27 # Generate the initramfs cpio archive
>> 28
>> 29 hostprogs-y := gen_init_cpio
>> 30 initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
>> 31 ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
>> 32 $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
>> 33 ramfs-args := \
>> 34 $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
>> 35 $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
52 36
53 # .initramfs_data.cpio.d is used to identify a 37 # .initramfs_data.cpio.d is used to identify all files included
54 # in initramfs and to detect if any files are 38 # in initramfs and to detect if any files are added/removed.
55 # Removed files are identified by directory ti 39 # Removed files are identified by directory timestamp being updated
56 # The dependency list is generated by gen_init 40 # The dependency list is generated by gen_initramfs.sh -l
57 -include $(obj)/.initramfs_data.cpio.d !! 41 ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),)
>> 42 include $(obj)/.initramfs_data.cpio.d
>> 43 endif
>> 44
>> 45 quiet_cmd_initfs = GEN $@
>> 46 cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
58 47
>> 48 targets := initramfs_data.cpio.gz initramfs_data.cpio.bz2 initramfs_data.cpio.lzma initramfs_data.cpio
59 # do not try to update files included in initr 49 # do not try to update files included in initramfs
60 $(deps_initramfs): ; 50 $(deps_initramfs): ;
61 51
62 quiet_cmd_initfs = GEN $@ !! 52 $(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: 53 # We rebuild initramfs_data.cpio if:
71 # 1) Any included file is newer than initramfs !! 54 # 1) Any included file is newer then initramfs_data.cpio
72 # 2) There are changes in which files are incl 55 # 2) There are changes in which files are included (added or deleted)
73 # 3) If gen_init_cpio are newer than initramfs 56 # 3) If gen_init_cpio are newer than initramfs_data.cpio
74 # 4) Arguments to gen_initramfs.sh changes !! 57 # 4) arguments to gen_initramfs.sh changes
75 $(obj)/initramfs_data.cpio: $(src)/gen_initram !! 58 $(obj)/initramfs_data.cpio$(suffix_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
>> 59 $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d
76 $(call if_changed,initfs) 60 $(call if_changed,initfs)
77 61
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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