# SPDX-License-Identifier: GPL-2.0 # # kbuild file for usr/ - including initramfs image # compress-y := copy compress-$(CONFIG_INITRAMFS_COMPRESSION_GZIP) := gzip compress-$(CONFIG_INITRAMFS_COMPRESSION_BZIP2) := bzip2 compress-$(CONFIG_INITRAMFS_COMPRESSION_LZMA) := lzma compress-$(CONFIG_INITRAMFS_COMPRESSION_XZ) := xzmisc compress-$(CONFIG_INITRAMFS_COMPRESSION_LZO) := lzo compress-$(CONFIG_INITRAMFS_COMPRESSION_LZ4) := lz4 compress-$(CONFIG_INITRAMFS_COMPRESSION_ZSTD) := zstd obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o $(obj)/initramfs_data.o: $(obj)/initramfs_inc_data ramfs-input := $(CONFIG_INITRAMFS_SOURCE) cpio-data := # If CONFIG_INITRAMFS_SOURCE is empty, generate a small initramfs with the # default contents. ifeq ($(ramfs-input),) ramfs-input := $(srctree)/$(src)/default_cpio_list endif ifeq ($(words $(ramfs-input)),1) # If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with # .cpio, use it directly as an initramfs. ifneq ($(filter %.cpio,$(ramfs-input)),) cpio-data := $(ramfs-input) endif # If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with # .cpio.*, use it directly as an initramfs, and avoid double compression. ifeq ($(words $(subst .cpio.,$(space),$(ramfs-input))),2) cpio-data := $(ramfs-input) compress-y := copy endif endif # For other cases, generate the initramfs cpio archive based on the contents # specified by CONFIG_INITRAMFS_SOURCE. ifeq ($(cpio-data),) cpio-data := $(obj)/initramfs_data.cpio hostprogs := gen_init_cpio # .initramfs_data.cpio.d is used to identify all files included # in initramfs and to detect if any files are added/removed. # Removed files are identified by directory timestamp being updated # The dependency list is generated by gen_initramfs.sh -l -include $(obj)/.initramfs_data.cpio.d # do not try to update files included in initramfs $(deps_initramfs): ; quiet_cmd_initfs = GEN $@ cmd_initfs = \ $(CONFIG_SHELL) $< -o $@ -l $(obj)/.initramfs_data.cpio.d \ $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \ $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) \ $(if $(KBUILD_BUILD_TIMESTAMP), -d "$(KBUILD_BUILD_TIMESTAMP)") \ $(ramfs-input) # We rebuild initramfs_data.cpio if: # 1) Any included file is newer than initramfs_data.cpio # 2) There are changes in which files are included (added or deleted) # 3) If gen_init_cpio are newer than initramfs_data.cpio # 4) Arguments to gen_initramfs.sh changes $(obj)/initramfs_data.cpio: $(src)/gen_initramfs.sh $(obj)/gen_init_cpio $(deps_initramfs) FORCE $(call if_changed,initfs) endif $(obj)/initramfs_inc_data: $(cpio-data) FORCE $(call if_changed,$(compress-y)) targets += initramfs_data.cpio initramfs_inc_data subdir-$(CONFIG_UAPI_HEADER_TEST) += include