1 # SPDX-License-Identifier: GPL-2.0 2 # 3 # kbuild file for usr/ - including initramfs image 4 # 5 6 compress-y := copy 7 compress-$(CONFIG_INITRAMFS_COMPRESSION_GZIP) := gzip 8 compress-$(CONFIG_INITRAMFS_COMPRESSION_BZIP2) := bzip2 9 compress-$(CONFIG_INITRAMFS_COMPRESSION_LZMA) := lzma 10 compress-$(CONFIG_INITRAMFS_COMPRESSION_XZ) := xzmisc 11 compress-$(CONFIG_INITRAMFS_COMPRESSION_LZO) := lzo 12 compress-$(CONFIG_INITRAMFS_COMPRESSION_LZ4) := lz4 13 compress-$(CONFIG_INITRAMFS_COMPRESSION_ZSTD) := zstd 14 15 obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o 16 17 $(obj)/initramfs_data.o: $(obj)/initramfs_inc_data 18 19 ramfs-input := $(CONFIG_INITRAMFS_SOURCE) 20 cpio-data := 21 22 # If CONFIG_INITRAMFS_SOURCE is empty, generate a small initramfs with the 23 # default contents. 24 ifeq ($(ramfs-input),) 25 ramfs-input := $(src)/default_cpio_list 26 endif 27 28 ifeq ($(words $(ramfs-input)),1) 29 30 # If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with 31 # .cpio, use it directly as an initramfs. 32 ifneq ($(filter %.cpio,$(ramfs-input)),) 33 cpio-data := $(ramfs-input) 34 endif 35 36 # If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with 37 # .cpio.*, use it directly as an initramfs, and avoid double compression. 38 ifeq ($(words $(subst .cpio.,$(space),$(ramfs-input))),2) 39 cpio-data := $(ramfs-input) 40 compress-y := copy 41 endif 42 43 endif 44 45 # For other cases, generate the initramfs cpio archive based on the contents 46 # specified by CONFIG_INITRAMFS_SOURCE. 47 ifeq ($(cpio-data),) 48 49 cpio-data := $(obj)/initramfs_data.cpio 50 51 hostprogs := gen_init_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 62 quiet_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 78 endif 79 80 $(obj)/initramfs_inc_data: $(cpio-data) FORCE 81 $(call if_changed,$(compress-y)) 82 83 targets += initramfs_data.cpio initramfs_inc_data 84 85 subdir-$(CONFIG_UAPI_HEADER_TEST) += include
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