usr/Makefile

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