| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | # SPDX-License-Identifier: GPL-2.0 |
| 2 | # |
| 3 | # kbuild file for usr/ - including initramfs image |
| 4 | # |
| 5 | |
| 6 | klibcdirs:; |
| 7 | PHONY += klibcdirs |
| 8 | |
| 9 | suffix_y = $(subst $\",,$(CONFIG_INITRAMFS_COMPRESSION)) |
| 10 | datafile_y = initramfs_data.cpio$(suffix_y) |
| 11 | datafile_d_y = .$(datafile_y).d |
| 12 | AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/$(datafile_y)" |
| 13 | |
| 14 | # clean rules do not have CONFIG_INITRAMFS_COMPRESSION. So clean up after all |
| 15 | # possible compression formats. |
| 16 | clean-files += initramfs_data.cpio* |
| 17 | |
| 18 | # Generate builtin.o based on initramfs_data.o |
| 19 | obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.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.o: $(obj)/$(datafile_y) FORCE |
| 25 | |
| 26 | ##### |
| 27 | # Generate the initramfs cpio archive |
| 28 | |
| 29 | hostprogs-y := gen_init_cpio |
| 30 | initramfs := $(CONFIG_SHELL) $(srctree)/$(src)/gen_initramfs_list.sh |
| 31 | ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \ |
| 32 | $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d) |
| 33 | ramfs-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 | # $(datafile_d_y) is used to identify all files included |
| 38 | # in initramfs and to detect if any files are added/removed. |
| 39 | # Removed files are identified by directory timestamp being updated |
| 40 | # The dependency list is generated by gen_initramfs.sh -l |
| 41 | ifneq ($(wildcard $(obj)/$(datafile_d_y)),) |
| 42 | include $(obj)/$(datafile_d_y) |
| 43 | endif |
| 44 | |
| 45 | deps_initramfs_sane := $(foreach v,$(deps_initramfs),$(if $(findstring :,$(v)),,$(v))) |
| 46 | |
| 47 | quiet_cmd_initfs = GEN $@ |
| 48 | cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input) |
| 49 | |
| 50 | targets := $(datafile_y) |
| 51 | |
| 52 | # do not try to update files included in initramfs |
| 53 | $(deps_initramfs_sane): ; |
| 54 | |
| 55 | $(deps_initramfs_sane): klibcdirs |
| 56 | # We rebuild initramfs_data.cpio if: |
| 57 | # 1) Any included file is newer than initramfs_data.cpio |
| 58 | # 2) There are changes in which files are included (added or deleted) |
| 59 | # 3) If gen_init_cpio are newer than initramfs_data.cpio |
| 60 | # 4) Arguments to gen_initramfs.sh changes |
| 61 | $(obj)/$(datafile_y): $(obj)/gen_init_cpio $(deps_initramfs_sane) klibcdirs |
| 62 | $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/$(datafile_d_y) |
| 63 | $(call if_changed,initfs) |
| 64 | |
| 65 | subdir-$(CONFIG_UAPI_HEADER_TEST) += include |