1# SPDX-License-Identifier: GPL-2.0 2# 3# kbuild file for usr/ - including initramfs image 4# 5 6suffix_y = $(subst $\",,$(CONFIG_INITRAMFS_COMPRESSION)) 7datafile_y = initramfs_data.cpio$(suffix_y) 8datafile_d_y = .$(datafile_y).d 9AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/$(datafile_y)" 10 11# clean rules do not have CONFIG_INITRAMFS_COMPRESSION. So clean up after all 12# possible compression formats. 13clean-files += initramfs_data.cpio* 14 15# Generate builtin.o based on initramfs_data.o 16obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o 17 18# initramfs_data.o contains the compressed initramfs_data.cpio image. 19# The image is included using .incbin, a dependency which is not 20# tracked automatically. 21$(obj)/initramfs_data.o: $(obj)/$(datafile_y) FORCE 22 23##### 24# Generate the initramfs cpio archive 25 26hostprogs-y := gen_init_cpio 27ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \ 28 $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d) 29ramfs-args := \ 30 $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \ 31 $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) 32 33# $(datafile_d_y) is used to identify all files included 34# in initramfs and to detect if any files are added/removed. 35# Removed files are identified by directory timestamp being updated 36# The dependency list is generated by gen_initramfs.sh -l 37ifneq ($(wildcard $(obj)/$(datafile_d_y)),) 38 include $(obj)/$(datafile_d_y) 39endif 40 41quiet_cmd_initfs = GEN $@ 42 cmd_initfs = $(CONFIG_SHELL) $< -o $@ $(ramfs-args) $(ramfs-input) 43 44targets := $(datafile_y) 45 46# do not try to update files included in initramfs 47$(deps_initramfs): ; 48 49# We rebuild initramfs_data.cpio if: 50# 1) Any included file is newer than initramfs_data.cpio 51# 2) There are changes in which files are included (added or deleted) 52# 3) If gen_init_cpio are newer than initramfs_data.cpio 53# 4) Arguments to gen_initramfs.sh changes 54$(obj)/$(datafile_y): $(src)/gen_initramfs.sh $(obj)/gen_init_cpio $(deps_initramfs) FORCE 55 $(Q)$< -l $(ramfs-input) > $(obj)/$(datafile_d_y) 56 $(call if_changed,initfs) 57 58subdir-$(CONFIG_UAPI_HEADER_TEST) += include 59