| # 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 |