| # SPDX-License-Identifier: GPL-2.0 | |
| # | |
| # kbuild file for usr/ - including initramfs image | |
| # | |
| klibcdirs:; | |
| PHONY += klibcdirs | |
| suffix_y = $(subst $\",,$(CONFIG_INITRAMFS_COMPRESSION)) | |
| datafile_y = initramfs_data.cpio$(suffix_y) | |
| datafile_d_y = .$(datafile_y).d | |
| AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/$(datafile_y)" | |
| # Generate builtin.o based on initramfs_data.o | |
| obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o | |
| # initramfs_data.o contains the compressed initramfs_data.cpio image. | |
| # The image is included using .incbin, a dependency which is not | |
| # tracked automatically. | |
| $(obj)/initramfs_data.o: $(obj)/$(datafile_y) FORCE | |
| ##### | |
| # Generate the initramfs cpio archive | |
| hostprogs-y := gen_init_cpio | |
| initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh | |
| ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \ | |
| $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d) | |
| ramfs-args := \ | |
| $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \ | |
| $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) | |
| # $(datafile_d_y) is used to identify all files included | |
| # in initramfs and to detect if any files are added/removed. | |
| # Removed files are identified by directory timestamp being updated | |
| # The dependency list is generated by gen_initramfs.sh -l | |
| ifneq ($(wildcard $(obj)/$(datafile_d_y)),) | |
| include $(obj)/$(datafile_d_y) | |
| endif | |
| quiet_cmd_initfs = GEN $@ | |
| cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input) | |
| targets := $(datafile_y) | |
| # do not try to update files included in initramfs | |
| $(deps_initramfs): ; | |
| $(deps_initramfs): klibcdirs | |
| # We rebuild initramfs_data.cpio if: | |
| # 1) Any included file is newer then initramfs_data.cpio | |
| # 2) There are changes in which files are included (added or deleted) | |
| # 3) If gen_init_cpio are newer than initramfs_data.cpio | |
| # 4) arguments to gen_initramfs.sh changes | |
| $(obj)/$(datafile_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs | |
| $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/$(datafile_d_y) | |
| $(call if_changed,initfs) |