Root/usr/Makefile

1#
2# kbuild file for usr/ - including initramfs image
3#
4
5klibcdirs:;
6PHONY += klibcdirs
7
8
9# Gzip
10suffix_$(CONFIG_INITRAMFS_COMPRESSION_GZIP) = .gz
11
12# Bzip2
13suffix_$(CONFIG_INITRAMFS_COMPRESSION_BZIP2) = .bz2
14
15# Lzma
16suffix_$(CONFIG_INITRAMFS_COMPRESSION_LZMA) = .lzma
17
18# Lzo
19suffix_$(CONFIG_INITRAMFS_COMPRESSION_LZO) = .lzo
20
21AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/initramfs_data.cpio$(suffix_y)"
22
23# Generate builtin.o based on initramfs_data.o
24obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
25
26# initramfs_data.o contains the compressed initramfs_data.cpio image.
27# The image is included using .incbin, a dependency which is not
28# tracked automatically.
29$(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio$(suffix_y) FORCE
30
31#####
32# Generate the initramfs cpio archive
33
34hostprogs-y := gen_init_cpio
35initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
36ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
37            $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
38ramfs-args := \
39        $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
40        $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
41
42# .initramfs_data.cpio.d is used to identify all files included
43# in initramfs and to detect if any files are added/removed.
44# Removed files are identified by directory timestamp being updated
45# The dependency list is generated by gen_initramfs.sh -l
46ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),)
47    include $(obj)/.initramfs_data.cpio.d
48endif
49
50quiet_cmd_initfs = GEN $@
51      cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
52
53targets := initramfs_data.cpio.gz initramfs_data.cpio.bz2 initramfs_data.cpio.lzma initramfs_data.cpio.lzo initramfs_data.cpio
54# do not try to update files included in initramfs
55$(deps_initramfs): ;
56
57$(deps_initramfs): klibcdirs
58# We rebuild initramfs_data.cpio if:
59# 1) Any included file is newer then initramfs_data.cpio
60# 2) There are changes in which files are included (added or deleted)
61# 3) If gen_init_cpio are newer than initramfs_data.cpio
62# 4) arguments to gen_initramfs.sh changes
63$(obj)/initramfs_data.cpio$(suffix_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
64    $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d
65    $(call if_changed,initfs)
66
67

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