1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 # 2 #
3 # kbuild file for usr/ - including initramfs i 3 # kbuild file for usr/ - including initramfs image
4 # 4 #
5 5
6 compress-y 6 compress-y := copy
7 compress-$(CONFIG_INITRAMFS_COMPRESSION_GZIP) 7 compress-$(CONFIG_INITRAMFS_COMPRESSION_GZIP) := gzip
8 compress-$(CONFIG_INITRAMFS_COMPRESSION_BZIP2) 8 compress-$(CONFIG_INITRAMFS_COMPRESSION_BZIP2) := bzip2
9 compress-$(CONFIG_INITRAMFS_COMPRESSION_LZMA) 9 compress-$(CONFIG_INITRAMFS_COMPRESSION_LZMA) := lzma
10 compress-$(CONFIG_INITRAMFS_COMPRESSION_XZ) 10 compress-$(CONFIG_INITRAMFS_COMPRESSION_XZ) := xzmisc
11 compress-$(CONFIG_INITRAMFS_COMPRESSION_LZO) 11 compress-$(CONFIG_INITRAMFS_COMPRESSION_LZO) := lzo
12 compress-$(CONFIG_INITRAMFS_COMPRESSION_LZ4) 12 compress-$(CONFIG_INITRAMFS_COMPRESSION_LZ4) := lz4
13 compress-$(CONFIG_INITRAMFS_COMPRESSION_ZSTD) 13 compress-$(CONFIG_INITRAMFS_COMPRESSION_ZSTD) := zstd
14 14
15 obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data 15 obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
16 16
17 $(obj)/initramfs_data.o: $(obj)/initramfs_inc_ 17 $(obj)/initramfs_data.o: $(obj)/initramfs_inc_data
18 18
19 ramfs-input := $(CONFIG_INITRAMFS_SOURCE) 19 ramfs-input := $(CONFIG_INITRAMFS_SOURCE)
20 cpio-data := 20 cpio-data :=
21 21
22 # If CONFIG_INITRAMFS_SOURCE is empty, generat 22 # If CONFIG_INITRAMFS_SOURCE is empty, generate a small initramfs with the
23 # default contents. 23 # default contents.
24 ifeq ($(ramfs-input),) 24 ifeq ($(ramfs-input),)
25 ramfs-input := $(src)/default_cpio_list !! 25 ramfs-input := $(srctree)/$(src)/default_cpio_list
26 endif 26 endif
27 27
28 ifeq ($(words $(ramfs-input)),1) 28 ifeq ($(words $(ramfs-input)),1)
29 29
30 # If CONFIG_INITRAMFS_SOURCE specifies a singl 30 # If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with
31 # .cpio, use it directly as an initramfs. 31 # .cpio, use it directly as an initramfs.
32 ifneq ($(filter %.cpio,$(ramfs-input)),) 32 ifneq ($(filter %.cpio,$(ramfs-input)),)
33 cpio-data := $(ramfs-input) 33 cpio-data := $(ramfs-input)
34 endif 34 endif
35 35
36 # If CONFIG_INITRAMFS_SOURCE specifies a singl 36 # If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with
37 # .cpio.*, use it directly as an initramfs, an 37 # .cpio.*, use it directly as an initramfs, and avoid double compression.
38 ifeq ($(words $(subst .cpio.,$(space),$(ramfs- 38 ifeq ($(words $(subst .cpio.,$(space),$(ramfs-input))),2)
39 cpio-data := $(ramfs-input) 39 cpio-data := $(ramfs-input)
40 compress-y := copy 40 compress-y := copy
41 endif 41 endif
42 42
43 endif 43 endif
44 44
45 # For other cases, generate the initramfs cpio 45 # For other cases, generate the initramfs cpio archive based on the contents
46 # specified by CONFIG_INITRAMFS_SOURCE. 46 # specified by CONFIG_INITRAMFS_SOURCE.
47 ifeq ($(cpio-data),) 47 ifeq ($(cpio-data),)
48 48
49 cpio-data := $(obj)/initramfs_data.cpio 49 cpio-data := $(obj)/initramfs_data.cpio
50 50
51 hostprogs := gen_init_cpio 51 hostprogs := gen_init_cpio
52 52
53 # .initramfs_data.cpio.d is used to identify a 53 # .initramfs_data.cpio.d is used to identify all files included
54 # in initramfs and to detect if any files are 54 # in initramfs and to detect if any files are added/removed.
55 # Removed files are identified by directory ti 55 # Removed files are identified by directory timestamp being updated
56 # The dependency list is generated by gen_init 56 # The dependency list is generated by gen_initramfs.sh -l
57 -include $(obj)/.initramfs_data.cpio.d 57 -include $(obj)/.initramfs_data.cpio.d
58 58
59 # do not try to update files included in initr 59 # do not try to update files included in initramfs
60 $(deps_initramfs): ; 60 $(deps_initramfs): ;
61 61
62 quiet_cmd_initfs = GEN $@ 62 quiet_cmd_initfs = GEN $@
63 cmd_initfs = \ 63 cmd_initfs = \
64 $(CONFIG_SHELL) $< -o $@ -l $(obj)/.in 64 $(CONFIG_SHELL) $< -o $@ -l $(obj)/.initramfs_data.cpio.d \
65 $(addprefix -u , $(CONFIG_INITRAMFS_RO !! 65 $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
66 $(addprefix -g , $(CONFIG_INITRAMFS_RO !! 66 $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) \
67 $(if $(KBUILD_BUILD_TIMESTAMP), -d "$( <<
68 $(ramfs-input) 67 $(ramfs-input)
69 68
70 # We rebuild initramfs_data.cpio if: 69 # We rebuild initramfs_data.cpio if:
71 # 1) Any included file is newer than initramfs 70 # 1) Any included file is newer than initramfs_data.cpio
72 # 2) There are changes in which files are incl 71 # 2) There are changes in which files are included (added or deleted)
73 # 3) If gen_init_cpio are newer than initramfs 72 # 3) If gen_init_cpio are newer than initramfs_data.cpio
74 # 4) Arguments to gen_initramfs.sh changes 73 # 4) Arguments to gen_initramfs.sh changes
75 $(obj)/initramfs_data.cpio: $(src)/gen_initram 74 $(obj)/initramfs_data.cpio: $(src)/gen_initramfs.sh $(obj)/gen_init_cpio $(deps_initramfs) FORCE
76 $(call if_changed,initfs) 75 $(call if_changed,initfs)
77 76
78 endif 77 endif
79 78
80 $(obj)/initramfs_inc_data: $(cpio-data) FORCE 79 $(obj)/initramfs_inc_data: $(cpio-data) FORCE
81 $(call if_changed,$(compress-y)) 80 $(call if_changed,$(compress-y))
82 81
83 targets += initramfs_data.cpio initramfs_inc_d 82 targets += initramfs_data.cpio initramfs_inc_data
84 83
85 subdir-$(CONFIG_UAPI_HEADER_TEST) += include 84 subdir-$(CONFIG_UAPI_HEADER_TEST) += include
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