| | 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 |
projects / linux-block.git / blame_incremental