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
   6klibcdirs:;
   7PHONY += klibcdirs
   8
   9suffix_y = $(subst $\",,$(CONFIG_INITRAMFS_COMPRESSION))
  10datafile_y = initramfs_data.cpio$(suffix_y)
  11datafile_d_y = .$(datafile_y).d
  12AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/$(datafile_y)"
  13
  14# clean rules do not have CONFIG_INITRAMFS_COMPRESSION.  So clean up after all
  15# possible compression formats.
  16clean-files += initramfs_data.cpio*
  17
  18# Generate builtin.o based on initramfs_data.o
  19obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
  20
  21# initramfs_data.o contains the compressed initramfs_data.cpio image.
  22# The image is included using .incbin, a dependency which is not
  23# tracked automatically.
  24$(obj)/initramfs_data.o: $(obj)/$(datafile_y) FORCE
  25
  26#####
  27# Generate the initramfs cpio archive
  28
  29hostprogs-y := gen_init_cpio
  30initramfs   := $(CONFIG_SHELL) $(srctree)/$(src)/gen_initramfs_list.sh
  31ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
  32                        $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
  33ramfs-args  := \
  34        $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
  35        $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
  36
  37# $(datafile_d_y) is used to identify all files included
  38# in initramfs and to detect if any files are added/removed.
  39# Removed files are identified by directory timestamp being updated
  40# The dependency list is generated by gen_initramfs.sh -l
  41ifneq ($(wildcard $(obj)/$(datafile_d_y)),)
  42        include $(obj)/$(datafile_d_y)
  43endif
  44
  45quiet_cmd_initfs = GEN     $@
  46      cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
  47
  48targets := $(datafile_y)
  49
  50# do not try to update files included in initramfs
  51$(deps_initramfs): ;
  52
  53$(deps_initramfs): klibcdirs
  54# We rebuild initramfs_data.cpio if:
  55# 1) Any included file is newer than initramfs_data.cpio
  56# 2) There are changes in which files are included (added or deleted)
  57# 3) If gen_init_cpio are newer than initramfs_data.cpio
  58# 4) Arguments to gen_initramfs.sh changes
  59$(obj)/$(datafile_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
  60        $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/$(datafile_d_y)
  61        $(call if_changed,initfs)
  62
  63subdir-$(CONFIG_UAPI_HEADER_TEST) += include
  64