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 18compress-$(CONFIG_INITRAMFS_COMPRESSION_ZSTD) := zstd 19 20obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o 21 22$(obj)/initramfs_data.o: $(obj)/initramfs_inc_data 23 24ramfs-input := $(strip $(shell echo $(CONFIG_INITRAMFS_SOURCE))) 25cpio-data := 26 27# If CONFIG_INITRAMFS_SOURCE is empty, generate a small initramfs with the 28# default contents. 29ifeq ($(ramfs-input),) 30ramfs-input := $(srctree)/$(src)/default_cpio_list 31endif 32 33ifeq ($(words $(ramfs-input)),1) 34 35# If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with 36# .cpio, use it directly as an initramfs. 37ifneq ($(filter %.cpio,$(ramfs-input)),) 38cpio-data := $(ramfs-input) 39endif 40 41# If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with 42# .cpio.*, use it directly as an initramfs, and avoid double compression. 43ifeq ($(words $(subst .cpio.,$(space),$(ramfs-input))),2) 44cpio-data := $(ramfs-input) 45compress-y := shipped 46endif 47 48endif 49 50# For other cases, generate the initramfs cpio archive based on the contents 51# specified by CONFIG_INITRAMFS_SOURCE. 52ifeq ($(cpio-data),) 53 54cpio-data := $(obj)/initramfs_data.cpio 55 56hostprogs := gen_init_cpio 57 58# .initramfs_data.cpio.d is used to identify all files included 59# in initramfs and to detect if any files are added/removed. 60# Removed files are identified by directory timestamp being updated 61# The dependency list is generated by gen_initramfs.sh -l 62-include $(obj)/.initramfs_data.cpio.d 63 64# do not try to update files included in initramfs 65$(deps_initramfs): ; 66 67quiet_cmd_initfs = GEN $@ 68 cmd_initfs = \ 69 $(CONFIG_SHELL) $< -o $@ -l $(obj)/.initramfs_data.cpio.d \ 70 $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \ 71 $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) \ 72 $(ramfs-input) 73 74# We rebuild initramfs_data.cpio if: 75# 1) Any included file is newer than initramfs_data.cpio 76# 2) There are changes in which files are included (added or deleted) 77# 3) If gen_init_cpio are newer than initramfs_data.cpio 78# 4) Arguments to gen_initramfs.sh changes 79$(obj)/initramfs_data.cpio: $(src)/gen_initramfs.sh $(obj)/gen_init_cpio $(deps_initramfs) FORCE 80 $(call if_changed,initfs) 81 82endif 83 84$(obj)/initramfs_inc_data: $(cpio-data) FORCE 85 $(call if_changed,$(compress-y)) 86 87targets += initramfs_data.cpio initramfs_inc_data 88 89subdir-$(CONFIG_UAPI_HEADER_TEST) += include 90