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