LXR linux/usr/Makefile

   1#
   2# kbuild file for usr/ - including initramfs image
   3#
   4
   5klibcdirs:;
   6PHONY += klibcdirs
   7
   8
   9# Bzip2
  10suffix_$(CONFIG_RD_BZIP2)  = .bz2
  11
  12# Lzma
  13suffix_$(CONFIG_RD_LZMA)   = .lzma
  14
  15# XZ
  16suffix_$(CONFIG_RD_XZ)     = .xz
  17
  18# Lzo
  19suffix_$(CONFIG_RD_LZO)    = .lzo
  20
  21# Lz4
  22suffix_$(CONFIG_RD_LZ4)    = .lz4
  23
  24# Gzip
  25suffix_$(CONFIG_RD_GZIP)   = .gz
  26
  27AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/initramfs_data.cpio$(suffix_y)"
  28
  29# Generate builtin.o based on initramfs_data.o
  30obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
  31
  32# initramfs_data.o contains the compressed initramfs_data.cpio image.
  33# The image is included using .incbin, a dependency which is not
  34# tracked automatically.
  35$(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio$(suffix_y) FORCE
  36
  37#####
  38# Generate the initramfs cpio archive
  39
  40hostprogs-y := gen_init_cpio
  41initramfs   := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
  42ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
  43                        $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
  44ramfs-args  := \
  45        $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
  46        $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
  47
  48# .initramfs_data.cpio.d is used to identify all files included
  49# in initramfs and to detect if any files are added/removed.
  50# Removed files are identified by directory timestamp being updated
  51# The dependency list is generated by gen_initramfs.sh -l
  52ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),)
  53        include $(obj)/.initramfs_data.cpio.d
  54endif
  55
  56quiet_cmd_initfs = GEN     $@
  57      cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
  58
  59targets := initramfs_data.cpio.gz initramfs_data.cpio.bz2 \
  60        initramfs_data.cpio.lzma initramfs_data.cpio.xz \
  61        initramfs_data.cpio.lzo initramfs_data.cpio.lz4 \
  62        initramfs_data.cpio
  63# do not try to update files included in initramfs
  64$(deps_initramfs): ;
  65
  66$(deps_initramfs): klibcdirs
  67# We rebuild initramfs_data.cpio if:
  68# 1) Any included file is newer then initramfs_data.cpio
  69# 2) There are changes in which files are included (added or deleted)
  70# 3) If gen_init_cpio are newer than initramfs_data.cpio
  71# 4) arguments to gen_initramfs.sh changes
  72$(obj)/initramfs_data.cpio$(suffix_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
  73        $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d
  74        $(call if_changed,initfs)
  75