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 !! 8 suffix_y = $(subst $\",,$(CONFIG_INITRAMFS_COMPRESSION))
16 !! 9 datafile_y = initramfs_data.cpio$(suffix_y)
17 $(obj)/initramfs_data.o: $(obj)/initramfs_inc_ !! 10 AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/$(datafile_y)"
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 := $(ramfs-input) <<
40 compress-y := copy <<
41 endif <<
42 <<
43 endif <<
44 11
45 # For other cases, generate the initramfs cpio <<
46 # specified by CONFIG_INITRAMFS_SOURCE. <<
47 ifeq ($(cpio-data),) <<
48 12
49 cpio-data := $(obj)/initramfs_data.cpio !! 13 # Generate builtin.o based on initramfs_data.o
>> 14 obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
50 15
51 hostprogs := gen_init_cpio !! 16 # initramfs_data.o contains the compressed initramfs_data.cpio image.
>> 17 # The image is included using .incbin, a dependency which is not
>> 18 # tracked automatically.
>> 19 $(obj)/initramfs_data.o: $(obj)/$(datafile_y) FORCE
>> 20
>> 21 #####
>> 22 # Generate the initramfs cpio archive
>> 23
>> 24 hostprogs-y := gen_init_cpio
>> 25 initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
>> 26 ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
>> 27 $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
>> 28 ramfs-args := \
>> 29 $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
>> 30 $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
52 31
53 # .initramfs_data.cpio.d is used to identify a 32 # .initramfs_data.cpio.d is used to identify all files included
54 # in initramfs and to detect if any files are 33 # in initramfs and to detect if any files are added/removed.
55 # Removed files are identified by directory ti 34 # Removed files are identified by directory timestamp being updated
56 # The dependency list is generated by gen_init 35 # The dependency list is generated by gen_initramfs.sh -l
57 -include $(obj)/.initramfs_data.cpio.d !! 36 ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),)
>> 37 include $(obj)/.initramfs_data.cpio.d
>> 38 endif
>> 39
>> 40 quiet_cmd_initfs = GEN $@
>> 41 cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
>> 42
>> 43 targets := $(datafile_y)
58 44
59 # do not try to update files included in initr 45 # do not try to update files included in initramfs
60 $(deps_initramfs): ; 46 $(deps_initramfs): ;
61 47
62 quiet_cmd_initfs = GEN $@ !! 48 $(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: 49 # We rebuild initramfs_data.cpio if:
71 # 1) Any included file is newer than initramfs !! 50 # 1) Any included file is newer then initramfs_data.cpio
72 # 2) There are changes in which files are incl 51 # 2) There are changes in which files are included (added or deleted)
73 # 3) If gen_init_cpio are newer than initramfs 52 # 3) If gen_init_cpio are newer than initramfs_data.cpio
74 # 4) Arguments to gen_initramfs.sh changes !! 53 # 4) arguments to gen_initramfs.sh changes
75 $(obj)/initramfs_data.cpio: $(src)/gen_initram !! 54 $(obj)/$(datafile_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
>> 55 $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d
76 $(call if_changed,initfs) 56 $(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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