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

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