1# SPDX-License-Identifier: GPL-2.0 2# 3# kbuild file for usr/ - including initramfs image 4# 5 6# cmd_bzip2, cmd_lzma, cmd_lzo, cmd_lz4 from scripts/Makefile.lib appends the 7# size at the end of the compressed file, which unfortunately does not work 8# with unpack_to_rootfs(). Make size_append no-op. 9override size_append := : 10 11compress-y := shipped 12compress-$(CONFIG_INITRAMFS_COMPRESSION_GZIP) := gzip 13compress-$(CONFIG_INITRAMFS_COMPRESSION_BZIP2) := bzip2 14compress-$(CONFIG_INITRAMFS_COMPRESSION_LZMA) := lzma 15compress-$(CONFIG_INITRAMFS_COMPRESSION_XZ) := xzmisc 16compress-$(CONFIG_INITRAMFS_COMPRESSION_LZO) := lzo 17compress-$(CONFIG_INITRAMFS_COMPRESSION_LZ4) := lz4 18 19obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o 20 21$(obj)/initramfs_data.o: $(obj)/initramfs_inc_data 22 23ramfs-input := $(strip $(shell echo $(CONFIG_INITRAMFS_SOURCE))) 24cpio-data := 25 26# If CONFIG_INITRAMFS_SOURCE is empty, generate a small initramfs with the 27# default contents. 28ifeq ($(ramfs-input),) 29ramfs-input := $(srctree)/$(src)/default_cpio_list 30endif 31 32ifeq ($(words $(ramfs-input)),1) 33 34# If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with 35# .cpio, use it directly as an initramfs. 36ifneq ($(filter %.cpio,$(ramfs-input)),) 37cpio-data := $(ramfs-input) 38endif 39 40# If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with 41# .cpio.*, use it directly as an initramfs, and avoid double compression. 42ifeq ($(words $(subst .cpio.,$(space),$(ramfs-input))),2) 43cpio-data := $(ramfs-input) 44compress-y := shipped 45endif 46 47endif 48 49# For other cases, generate the initramfs cpio archive based on the contents 50# specified by CONFIG_INITRAMFS_SOURCE. 51ifeq ($(cpio-data),) 52 53cpio-data := $(obj)/initramfs_data.cpio 54 55hostprogs := gen_init_cpio 56 57# .initramfs_data.cpio.d is used to identify all files included 58# in initramfs and to detect if any files are added/removed. 59# Removed files are identified by directory timestamp being updated 60# The dependency list is generated by gen_initramfs.sh -l 61-include $(obj)/.initramfs_data.cpio.d 62 63# do not try to update files included in initramfs 64$(deps_initramfs): ; 65 66quiet_cmd_initfs = GEN $@ 67 cmd_initfs = \ 68 $(CONFIG_SHELL) $< -o $@ -l $(obj)/.initramfs_data.cpio.d \ 69 $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \ 70 $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) \ 71 $(ramfs-input) 72 73# We rebuild initramfs_data.cpio if: 74# 1) Any included file is newer than initramfs_data.cpio 75# 2) There are changes in which files are included (added or deleted) 76# 3) If gen_init_cpio are newer than initramfs_data.cpio 77# 4) Arguments to gen_initramfs.sh changes 78$(obj)/initramfs_data.cpio: $(src)/gen_initramfs.sh $(obj)/gen_init_cpio $(deps_initramfs) FORCE 79 $(call if_changed,initfs) 80 81endif 82 83$(obj)/initramfs_inc_data: $(cpio-data) FORCE 84 $(call if_changed,$(compress-y)) 85 86targets += initramfs_data.cpio initramfs_inc_data 87 88subdir-$(CONFIG_UAPI_HEADER_TEST) += include 89