1*4882a593Smuzhiyun# SPDX-License-Identifier: GPL-2.0 2*4882a593Smuzhiyun# 3*4882a593Smuzhiyun# kbuild file for usr/ - including initramfs image 4*4882a593Smuzhiyun# 5*4882a593Smuzhiyun 6*4882a593Smuzhiyun# cmd_bzip2, cmd_lzma, cmd_lzo, cmd_lz4 from scripts/Makefile.lib appends the 7*4882a593Smuzhiyun# size at the end of the compressed file, which unfortunately does not work 8*4882a593Smuzhiyun# with unpack_to_rootfs(). Make size_append no-op. 9*4882a593Smuzhiyunoverride size_append := : 10*4882a593Smuzhiyun 11*4882a593Smuzhiyuncompress-y := shipped 12*4882a593Smuzhiyuncompress-$(CONFIG_INITRAMFS_COMPRESSION_GZIP) := gzip 13*4882a593Smuzhiyuncompress-$(CONFIG_INITRAMFS_COMPRESSION_BZIP2) := bzip2 14*4882a593Smuzhiyuncompress-$(CONFIG_INITRAMFS_COMPRESSION_LZMA) := lzma 15*4882a593Smuzhiyuncompress-$(CONFIG_INITRAMFS_COMPRESSION_XZ) := xzmisc 16*4882a593Smuzhiyuncompress-$(CONFIG_INITRAMFS_COMPRESSION_LZO) := lzo 17*4882a593Smuzhiyuncompress-$(CONFIG_INITRAMFS_COMPRESSION_LZ4) := lz4 18*4882a593Smuzhiyuncompress-$(CONFIG_INITRAMFS_COMPRESSION_ZSTD) := zstd 19*4882a593Smuzhiyun 20*4882a593Smuzhiyunobj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o 21*4882a593Smuzhiyun 22*4882a593Smuzhiyun$(obj)/initramfs_data.o: $(obj)/initramfs_inc_data 23*4882a593Smuzhiyun 24*4882a593Smuzhiyunramfs-input := $(strip $(shell echo $(CONFIG_INITRAMFS_SOURCE))) 25*4882a593Smuzhiyuncpio-data := 26*4882a593Smuzhiyun 27*4882a593Smuzhiyun# If CONFIG_INITRAMFS_SOURCE is empty, generate a small initramfs with the 28*4882a593Smuzhiyun# default contents. 29*4882a593Smuzhiyunifeq ($(ramfs-input),) 30*4882a593Smuzhiyunramfs-input := $(srctree)/$(src)/default_cpio_list 31*4882a593Smuzhiyunendif 32*4882a593Smuzhiyun 33*4882a593Smuzhiyunifeq ($(words $(ramfs-input)),1) 34*4882a593Smuzhiyun 35*4882a593Smuzhiyun# If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with 36*4882a593Smuzhiyun# .cpio, use it directly as an initramfs. 37*4882a593Smuzhiyunifneq ($(filter %.cpio,$(ramfs-input)),) 38*4882a593Smuzhiyuncpio-data := $(ramfs-input) 39*4882a593Smuzhiyunendif 40*4882a593Smuzhiyun 41*4882a593Smuzhiyun# If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with 42*4882a593Smuzhiyun# .cpio.*, use it directly as an initramfs, and avoid double compression. 43*4882a593Smuzhiyunifeq ($(words $(subst .cpio.,$(space),$(ramfs-input))),2) 44*4882a593Smuzhiyuncpio-data := $(ramfs-input) 45*4882a593Smuzhiyuncompress-y := shipped 46*4882a593Smuzhiyunendif 47*4882a593Smuzhiyun 48*4882a593Smuzhiyunendif 49*4882a593Smuzhiyun 50*4882a593Smuzhiyun# For other cases, generate the initramfs cpio archive based on the contents 51*4882a593Smuzhiyun# specified by CONFIG_INITRAMFS_SOURCE. 52*4882a593Smuzhiyunifeq ($(cpio-data),) 53*4882a593Smuzhiyun 54*4882a593Smuzhiyuncpio-data := $(obj)/initramfs_data.cpio 55*4882a593Smuzhiyun 56*4882a593Smuzhiyunhostprogs := gen_init_cpio 57*4882a593Smuzhiyun 58*4882a593Smuzhiyun# .initramfs_data.cpio.d is used to identify all files included 59*4882a593Smuzhiyun# in initramfs and to detect if any files are added/removed. 60*4882a593Smuzhiyun# Removed files are identified by directory timestamp being updated 61*4882a593Smuzhiyun# The dependency list is generated by gen_initramfs.sh -l 62*4882a593Smuzhiyun-include $(obj)/.initramfs_data.cpio.d 63*4882a593Smuzhiyun 64*4882a593Smuzhiyun# do not try to update files included in initramfs 65*4882a593Smuzhiyun$(deps_initramfs): ; 66*4882a593Smuzhiyun 67*4882a593Smuzhiyunquiet_cmd_initfs = GEN $@ 68*4882a593Smuzhiyun cmd_initfs = \ 69*4882a593Smuzhiyun $(CONFIG_SHELL) $< -o $@ -l $(obj)/.initramfs_data.cpio.d \ 70*4882a593Smuzhiyun $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \ 71*4882a593Smuzhiyun $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) \ 72*4882a593Smuzhiyun $(ramfs-input) 73*4882a593Smuzhiyun 74*4882a593Smuzhiyun# We rebuild initramfs_data.cpio if: 75*4882a593Smuzhiyun# 1) Any included file is newer than initramfs_data.cpio 76*4882a593Smuzhiyun# 2) There are changes in which files are included (added or deleted) 77*4882a593Smuzhiyun# 3) If gen_init_cpio are newer than initramfs_data.cpio 78*4882a593Smuzhiyun# 4) Arguments to gen_initramfs.sh changes 79*4882a593Smuzhiyun$(obj)/initramfs_data.cpio: $(src)/gen_initramfs.sh $(obj)/gen_init_cpio $(deps_initramfs) FORCE 80*4882a593Smuzhiyun $(call if_changed,initfs) 81*4882a593Smuzhiyun 82*4882a593Smuzhiyunendif 83*4882a593Smuzhiyun 84*4882a593Smuzhiyun$(obj)/initramfs_inc_data: $(cpio-data) FORCE 85*4882a593Smuzhiyun $(call if_changed,$(compress-y)) 86*4882a593Smuzhiyun 87*4882a593Smuzhiyuntargets += initramfs_data.cpio initramfs_inc_data 88*4882a593Smuzhiyun 89*4882a593Smuzhiyunsubdir-$(CONFIG_UAPI_HEADER_TEST) += include 90