1 # SPDX-License-Identifier: GPL-2.0
3 # kbuild file for usr/ - including initramfs image
7 compress-
$(CONFIG_INITRAMFS_COMPRESSION_GZIP
) := gzip
8 compress-
$(CONFIG_INITRAMFS_COMPRESSION_BZIP2
) := bzip2
9 compress-
$(CONFIG_INITRAMFS_COMPRESSION_LZMA
) := lzma
10 compress-
$(CONFIG_INITRAMFS_COMPRESSION_XZ
) := xzmisc
11 compress-
$(CONFIG_INITRAMFS_COMPRESSION_LZO
) := lzo
12 compress-
$(CONFIG_INITRAMFS_COMPRESSION_LZ4
) := lz4
13 compress-
$(CONFIG_INITRAMFS_COMPRESSION_ZSTD
) := zstd
15 obj-
$(CONFIG_BLK_DEV_INITRD
) := initramfs_data.o
17 $(obj
)/initramfs_data.o
: $(obj
)/initramfs_inc_data
19 ramfs-input
:= $(CONFIG_INITRAMFS_SOURCE
)
22 # If CONFIG_INITRAMFS_SOURCE is empty, generate a small initramfs with the
24 ifeq ($(ramfs-input
),)
25 ramfs-input
:= $(srctree
)/$(src
)/default_cpio_list
28 ifeq ($(words $(ramfs-input
)),1)
30 # If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with
31 # .cpio, use it directly as an initramfs.
32 ifneq ($(filter %.cpio
,$(ramfs-input
)),)
33 cpio-data
:= $(ramfs-input
)
36 # If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with
37 # .cpio.*, use it directly as an initramfs, and avoid double compression.
38 ifeq ($(words $(subst .cpio.
,$(space
),$(ramfs-input
))),2)
39 cpio-data
:= $(ramfs-input
)
45 # For other cases, generate the initramfs cpio archive based on the contents
46 # specified by CONFIG_INITRAMFS_SOURCE.
49 cpio-data
:= $(obj
)/initramfs_data.cpio
51 hostprogs
:= gen_init_cpio
53 # .initramfs_data.cpio.d is used to identify all files included
54 # in initramfs and to detect if any files are added/removed.
55 # Removed files are identified by directory timestamp being updated
56 # The dependency list is generated by gen_initramfs.sh -l
57 -include $(obj
)/.initramfs_data.cpio.d
59 # do not try to update files included in initramfs
62 quiet_cmd_initfs
= GEN
$@
64 $(CONFIG_SHELL
) $< -o
$@
-l
$(obj
)/.initramfs_data.cpio.d \
65 $(if
$(CONFIG_INITRAMFS_ROOT_UID
), -u
$(CONFIG_INITRAMFS_ROOT_UID
)) \
66 $(if
$(CONFIG_INITRAMFS_ROOT_GID
), -g
$(CONFIG_INITRAMFS_ROOT_GID
)) \
69 # We rebuild initramfs_data.cpio if:
70 # 1) Any included file is newer than initramfs_data.cpio
71 # 2) There are changes in which files are included (added or deleted)
72 # 3) If gen_init_cpio are newer than initramfs_data.cpio
73 # 4) Arguments to gen_initramfs.sh changes
74 $(obj
)/initramfs_data.cpio
: $(src
)/gen_initramfs.sh
$(obj
)/gen_init_cpio
$(deps_initramfs
) FORCE
75 $(call if_changed
,initfs
)
79 $(obj
)/initramfs_inc_data
: $(cpio-data
) FORCE
80 $(call if_changed
,$(compress-y
))
82 targets
+= initramfs_data.cpio initramfs_inc_data
84 subdir-
$(CONFIG_UAPI_HEADER_TEST
) += include