1# SPDX-License-Identifier: GPL-2.0 2# 3# kbuild file for usr/ - including initramfs image 4# 5 6compress-y := copy 7compress-$(CONFIG_INITRAMFS_COMPRESSION_GZIP) := gzip 8compress-$(CONFIG_INITRAMFS_COMPRESSION_BZIP2) := bzip2 9compress-$(CONFIG_INITRAMFS_COMPRESSION_LZMA) := lzma 10compress-$(CONFIG_INITRAMFS_COMPRESSION_XZ) := xzmisc 11compress-$(CONFIG_INITRAMFS_COMPRESSION_LZO) := lzo 12compress-$(CONFIG_INITRAMFS_COMPRESSION_LZ4) := lz4 13compress-$(CONFIG_INITRAMFS_COMPRESSION_ZSTD) := zstd 14 15obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o 16 17$(obj)/initramfs_data.o: $(obj)/initramfs_inc_data 18 19hostprogs := gen_init_cpio 20 21ramfs-input := $(CONFIG_INITRAMFS_SOURCE) 22cpio-data := 23 24# If CONFIG_INITRAMFS_SOURCE is empty, generate a small initramfs with the 25# default contents. 26ifeq ($(ramfs-input),) 27ramfs-input := $(src)/default_cpio_list 28endif 29 30ifeq ($(words $(ramfs-input)),1) 31 32# If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with 33# .cpio, use it directly as an initramfs. 34ifneq ($(filter %.cpio,$(ramfs-input)),) 35cpio-data := $(ramfs-input) 36endif 37 38# If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with 39# .cpio.*, use it directly as an initramfs, and avoid double compression. 40ifeq ($(words $(subst .cpio.,$(space),$(ramfs-input))),2) 41cpio-data := $(ramfs-input) 42compress-y := copy 43endif 44 45endif 46 47# For other cases, generate the initramfs cpio archive based on the contents 48# specified by CONFIG_INITRAMFS_SOURCE. 49ifeq ($(cpio-data),) 50 51cpio-data := $(obj)/initramfs_data.cpio 52 53# .initramfs_data.cpio.d is used to identify all files included 54# in initramfs and to detect if any files are added/removed. 55# Removed files are identified by directory timestamp being updated 56# The dependency list is generated by gen_initramfs.sh -l 57-include $(obj)/.initramfs_data.cpio.d 58 59# do not try to update files included in initramfs 60$(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 $(ramfs-input) 69 70# We rebuild initramfs_data.cpio if: 71# 1) Any included file is newer than initramfs_data.cpio 72# 2) There are changes in which files are included (added or deleted) 73# 3) If gen_init_cpio are newer than initramfs_data.cpio 74# 4) Arguments to gen_initramfs.sh changes 75$(obj)/initramfs_data.cpio: $(src)/gen_initramfs.sh $(obj)/gen_init_cpio $(deps_initramfs) FORCE 76 $(call if_changed,initfs) 77 78endif 79 80$(obj)/initramfs_inc_data: $(cpio-data) FORCE 81 $(call if_changed,$(compress-y)) 82 83targets += initramfs_data.cpio initramfs_inc_data 84 85subdir-$(CONFIG_UAPI_HEADER_TEST) += include 86