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1# SPDX-License-Identifier: GPL-2.02#3# kbuild file for usr/ - including initramfs image4#5 6compress-y := copy7compress-$(CONFIG_INITRAMFS_COMPRESSION_GZIP) := gzip8compress-$(CONFIG_INITRAMFS_COMPRESSION_BZIP2) := bzip29compress-$(CONFIG_INITRAMFS_COMPRESSION_LZMA) := lzma10compress-$(CONFIG_INITRAMFS_COMPRESSION_XZ) := xzmisc11compress-$(CONFIG_INITRAMFS_COMPRESSION_LZO) := lzo12compress-$(CONFIG_INITRAMFS_COMPRESSION_LZ4) := lz413compress-$(CONFIG_INITRAMFS_COMPRESSION_ZSTD) := zstd14 15obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o16 17$(obj)/initramfs_data.o: $(obj)/initramfs_inc_data18 19ramfs-input := $(CONFIG_INITRAMFS_SOURCE)20cpio-data :=21 22# If CONFIG_INITRAMFS_SOURCE is empty, generate a small initramfs with the23# default contents.24ifeq ($(ramfs-input),)25ramfs-input := $(src)/default_cpio_list26endif27 28ifeq ($(words $(ramfs-input)),1)29 30# If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with31# .cpio, use it directly as an initramfs.32ifneq ($(filter %.cpio,$(ramfs-input)),)33cpio-data := $(ramfs-input)34endif35 36# If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with37# .cpio.*, use it directly as an initramfs, and avoid double compression.38ifeq ($(words $(subst .cpio.,$(space),$(ramfs-input))),2)39cpio-data := $(ramfs-input)40compress-y := copy41endif42 43endif44 45# For other cases, generate the initramfs cpio archive based on the contents46# specified by CONFIG_INITRAMFS_SOURCE.47ifeq ($(cpio-data),)48 49cpio-data := $(obj)/initramfs_data.cpio50 51hostprogs := gen_init_cpio52 53# .initramfs_data.cpio.d is used to identify all files included54# in initramfs and to detect if any files are added/removed.55# Removed files are identified by directory timestamp being updated56# The dependency list is generated by gen_initramfs.sh -l57-include $(obj)/.initramfs_data.cpio.d58 59# do not try to update files included in initramfs60$(deps_initramfs): ;61 62quiet_cmd_initfs = GEN $@63 cmd_initfs = \64 $(CONFIG_SHELL) $< -o $@ -l $(obj)/.initramfs_data.cpio.d \65 $(addprefix -u , $(CONFIG_INITRAMFS_ROOT_UID)) \66 $(addprefix -g , $(CONFIG_INITRAMFS_ROOT_GID)) \67 $(if $(KBUILD_BUILD_TIMESTAMP), -d "$(KBUILD_BUILD_TIMESTAMP)") \68 $(ramfs-input)69 70# We rebuild initramfs_data.cpio if:71# 1) Any included file is newer than initramfs_data.cpio72# 2) There are changes in which files are included (added or deleted)73# 3) If gen_init_cpio are newer than initramfs_data.cpio74# 4) Arguments to gen_initramfs.sh changes75$(obj)/initramfs_data.cpio: $(src)/gen_initramfs.sh $(obj)/gen_init_cpio $(deps_initramfs) FORCE76 $(call if_changed,initfs)77 78endif79 80$(obj)/initramfs_inc_data: $(cpio-data) FORCE81 $(call if_changed,$(compress-y))82 83targets += initramfs_data.cpio initramfs_inc_data84 85subdir-$(CONFIG_UAPI_HEADER_TEST) += include86