projects/linux·blob v3.0-rc2 · refs

69 lines · 2.3 KiB

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