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Linux/usr/Makefile

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  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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