Commit | Line | Data |
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b2441318 | 1 | # SPDX-License-Identifier: GPL-2.0 |
d39a206b SR |
2 | # |
3 | # kbuild file for usr/ - including initramfs image | |
4 | # | |
1da177e4 | 5 | |
d39a206b | 6 | klibcdirs:; |
48f1f058 SR |
7 | PHONY += klibcdirs |
8 | ||
ae30ab4c | 9 | suffix_y = $(subst $\",,$(CONFIG_INITRAMFS_COMPRESSION)) |
9e3596b0 NP |
10 | datafile_y = initramfs_data.cpio$(suffix_y) |
11 | AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/$(datafile_y)" | |
12 | ||
6ae64e42 | 13 | |
d39a206b | 14 | # Generate builtin.o based on initramfs_data.o |
6ae64e42 | 15 | obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o |
1da177e4 | 16 | |
a26ee60f | 17 | # initramfs_data.o contains the compressed initramfs_data.cpio image. |
1da177e4 LT |
18 | # The image is included using .incbin, a dependency which is not |
19 | # tracked automatically. | |
9e3596b0 | 20 | $(obj)/initramfs_data.o: $(obj)/$(datafile_y) FORCE |
1da177e4 | 21 | |
d39a206b SR |
22 | ##### |
23 | # Generate the initramfs cpio archive | |
24 | ||
25 | hostprogs-y := gen_init_cpio | |
26 | initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh | |
27 | ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \ | |
a26d79ca | 28 | $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d) |
d39a206b SR |
29 | ramfs-args := \ |
30 | $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \ | |
ff541710 | 31 | $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) |
d39a206b | 32 | |
a26ee60f | 33 | # .initramfs_data.cpio.d is used to identify all files included |
d39a206b SR |
34 | # in initramfs and to detect if any files are added/removed. |
35 | # Removed files are identified by directory timestamp being updated | |
36 | # The dependency list is generated by gen_initramfs.sh -l | |
a26ee60f AK |
37 | ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),) |
38 | include $(obj)/.initramfs_data.cpio.d | |
1da177e4 LT |
39 | endif |
40 | ||
d39a206b SR |
41 | quiet_cmd_initfs = GEN $@ |
42 | cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input) | |
43 | ||
9e3596b0 NP |
44 | targets := $(datafile_y) |
45 | ||
58a2f7d8 SR |
46 | # do not try to update files included in initramfs |
47 | $(deps_initramfs): ; | |
48 | ||
d39a206b | 49 | $(deps_initramfs): klibcdirs |
a26ee60f AK |
50 | # We rebuild initramfs_data.cpio if: |
51 | # 1) Any included file is newer then initramfs_data.cpio | |
d39a206b | 52 | # 2) There are changes in which files are included (added or deleted) |
a26ee60f | 53 | # 3) If gen_init_cpio are newer than initramfs_data.cpio |
d39a206b | 54 | # 4) arguments to gen_initramfs.sh changes |
9e3596b0 | 55 | $(obj)/$(datafile_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs |
a26ee60f | 56 | $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d |
d39a206b | 57 | $(call if_changed,initfs) |