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$(suffix_y) 11AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/$(datafile_y)" 12 13 14# Generate builtin.o based on initramfs_data.o 15obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o 16 17# initramfs_data.o contains the compressed initramfs_data.cpio image. 18# The image is included using .incbin, a dependency which is not 19# tracked automatically. 20$(obj)/initramfs_data.o: $(obj)/$(datafile_y) FORCE 21 22##### 23# Generate the initramfs cpio archive 24 25hostprogs-y := gen_init_cpio 26initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh 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 $(CONFIG_INITRAMFS_ROOT_GID)) 32 33# .initramfs_data.cpio.d is used to identify all files included 34# in initramfs and to detect if any files are added/removed. 35# Removed files are identified by directory timestamp being updated 36# The dependency list is generated by gen_initramfs.sh -l 37ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),) 38 include $(obj)/.initramfs_data.cpio.d 39endif 40 41quiet_cmd_initfs = GEN $@ 42 cmd_initfs = $(initramfs) -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$(deps_initramfs): klibcdirs 50# We rebuild initramfs_data.cpio if: 51# 1) Any included file is newer then initramfs_data.cpio 52# 2) There are changes in which files are included (added or deleted) 53# 3) If gen_init_cpio are newer than initramfs_data.cpio 54# 4) arguments to gen_initramfs.sh changes 55$(obj)/$(datafile_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs 56 $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d 57 $(call if_changed,initfs) 58