Root/usr/Makefile

1#
2# kbuild file for usr/ - including initramfs image
3#
4
5klibcdirs:;
6PHONY += klibcdirs
7
8
9# Bzip2
10suffix_$(CONFIG_RD_BZIP2) = .bz2
11
12# Lzma
13suffix_$(CONFIG_RD_LZMA) = .lzma
14
15# XZ
16suffix_$(CONFIG_RD_XZ) = .xz
17
18# Lzo
19suffix_$(CONFIG_RD_LZO) = .lzo
20
21# Lz4
22suffix_$(CONFIG_RD_LZ4) = .lz4
23
24# Gzip
25suffix_$(CONFIG_RD_GZIP) = .gz
26
27AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/initramfs_data.cpio$(suffix_y)"
28
29# Generate builtin.o based on initramfs_data.o
30obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
31
32# initramfs_data.o contains the compressed initramfs_data.cpio image.
33# The image is included using .incbin, a dependency which is not
34# tracked automatically.
35$(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio$(suffix_y) FORCE
36
37#####
38# Generate the initramfs cpio archive
39
40hostprogs-y := gen_init_cpio
41initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
42ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
43            $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
44ramfs-args := \
45        $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
46        $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
47
48# .initramfs_data.cpio.d is used to identify all files included
49# in initramfs and to detect if any files are added/removed.
50# Removed files are identified by directory timestamp being updated
51# The dependency list is generated by gen_initramfs.sh -l
52ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),)
53    include $(obj)/.initramfs_data.cpio.d
54endif
55
56quiet_cmd_initfs = GEN $@
57      cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
58
59targets := initramfs_data.cpio.gz initramfs_data.cpio.bz2 \
60    initramfs_data.cpio.lzma initramfs_data.cpio.xz \
61    initramfs_data.cpio.lzo initramfs_data.cpio.lz4 \
62    initramfs_data.cpio
63# do not try to update files included in initramfs
64$(deps_initramfs): ;
65
66$(deps_initramfs): klibcdirs
67# We rebuild initramfs_data.cpio if:
68# 1) Any included file is newer then initramfs_data.cpio
69# 2) There are changes in which files are included (added or deleted)
70# 3) If gen_init_cpio are newer than initramfs_data.cpio
71# 4) arguments to gen_initramfs.sh changes
72$(obj)/initramfs_data.cpio$(suffix_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
73    $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d
74    $(call if_changed,initfs)
75

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