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. 9 override size_append := : 10 11 compress-y := shipped 12 compress-$(CONFIG_INITRAMFS_COMPRESSION_GZIP) := gzip 13 compress-$(CONFIG_INITRAMFS_COMPRESSION_BZIP2) := bzip2 14 compress-$(CONFIG_INITRAMFS_COMPRESSION_LZMA) := lzma 15 compress-$(CONFIG_INITRAMFS_COMPRESSION_XZ) := xzmisc 16 compress-$(CONFIG_INITRAMFS_COMPRESSION_LZO) := lzo 17 compress-$(CONFIG_INITRAMFS_COMPRESSION_LZ4) := lz4 18 compress-$(CONFIG_INITRAMFS_COMPRESSION_ZSTD) := zstd 19 20 obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o 21 22 $(obj)/initramfs_data.o: $(obj)/initramfs_inc_data 23 24 ramfs-input := $(strip $(shell echo $(CONFIG_INITRAMFS_SOURCE))) 25 cpio-data := 26 27 # If CONFIG_INITRAMFS_SOURCE is empty, generate a small initramfs with the 28 # default contents. 29 ifeq ($(ramfs-input),) 30 ramfs-input := $(srctree)/$(src)/default_cpio_list 31 endif 32 33 ifeq ($(words $(ramfs-input)),1) 34 35 # If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with 36 # .cpio, use it directly as an initramfs. 37 ifneq ($(filter %.cpio,$(ramfs-input)),) 38 cpio-data := $(ramfs-input) 39 endif 40 41 # If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with 42 # .cpio.*, use it directly as an initramfs, and avoid double compression. 43 ifeq ($(words $(subst .cpio.,$(space),$(ramfs-input))),2) 44 cpio-data := $(ramfs-input) 45 compress-y := shipped 46 endif 47 48 endif 49 50 # For other cases, generate the initramfs cpio archive based on the contents 51 # specified by CONFIG_INITRAMFS_SOURCE. 52 ifeq ($(cpio-data),) 53 54 cpio-data := $(obj)/initramfs_data.cpio 55 56 hostprogs := 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 67 quiet_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 82 endif 83 84 $(obj)/initramfs_inc_data: $(cpio-data) FORCE 85 $(call if_changed,$(compress-y)) 86 87 targets += initramfs_data.cpio initramfs_inc_data 88 89 subdir-$(CONFIG_UAPI_HEADER_TEST) += include 90