1#
 2# kbuild file for usr - including initramfs image
 3#
 4
 5klibcdirs:;
 6PHONY += klibcdirs
 
 
 
 
 
 
 7
 8suffix_y = $(subst $\",,$(CONFIG_INITRAMFS_COMPRESSION))
 9datafile_y = initramfs_data.cpio$(suffix_y)
10AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/$(datafile_y)"
11
 
12
13# Generate builtin.o based on initramfs_data.o
14obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
15
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
24hostprogs-y := gen_init_cpio
25initramfs   := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
26ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
27			$(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
28ramfs-args  := \
29        $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
30        $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
31
32# .initramfs_data.cpio.d is used to identify all files included
33# in initramfs and to detect if any files are added/removed.
34# Removed files are identified by directory timestamp being updated
35# The dependency list is generated by gen_initramfs.sh -l
36ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),)
37	include $(obj)/.initramfs_data.cpio.d
38endif
39
40quiet_cmd_initfs = GEN     $@
41      cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
42
43targets := $(datafile_y)
44
45# do not try to update files included in initramfs
46$(deps_initramfs): ;
47
48$(deps_initramfs): klibcdirs
 
 
 
 
 
 
 
49# We rebuild initramfs_data.cpio if:
50# 1) Any included file is newer then initramfs_data.cpio
51# 2) There are changes in which files are included (added or deleted)
52# 3) If gen_init_cpio are newer than initramfs_data.cpio
53# 4) arguments to gen_initramfs.sh changes
54$(obj)/$(datafile_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
55	$(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d
56	$(call if_changed,initfs)

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