linux/usr/Makefile
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   1#
   2# kbuild file for usr/ - including initramfs image
   3#
   4
   5klibcdirs:;
   6PHONY += klibcdirs
   7
   8
   9# Gzip
  10suffix_$(CONFIG_INITRAMFS_COMPRESSION_GZIP)   = .gz
  11
  12# Bzip2
  13suffix_$(CONFIG_INITRAMFS_COMPRESSION_BZIP2)  = .bz2
  14
  15# Lzma
  16suffix_$(CONFIG_INITRAMFS_COMPRESSION_LZMA)   = .lzma
  17
  18# XZ
  19suffix_$(CONFIG_INITRAMFS_COMPRESSION_XZ)     = .xz
  20
  21# Lzo
  22suffix_$(CONFIG_INITRAMFS_COMPRESSION_LZO)   = .lzo
  23
  24AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/initramfs_data.cpio$(suffix_y)"
  25
  26# Generate builtin.o based on initramfs_data.o
  27obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
  28
  29# initramfs_data.o contains the compressed initramfs_data.cpio image.
  30# The image is included using .incbin, a dependency which is not
  31# tracked automatically.
  32$(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio$(suffix_y) FORCE
  33
  34#####
  35# Generate the initramfs cpio archive
  36
  37hostprogs-y := gen_init_cpio
  38initramfs   := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
  39ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
  40                        $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
  41ramfs-args  := \
  42        $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
  43        $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
  44
  45# .initramfs_data.cpio.d is used to identify all files included
  46# in initramfs and to detect if any files are added/removed.
  47# Removed files are identified by directory timestamp being updated
  48# The dependency list is generated by gen_initramfs.sh -l
  49ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),)
  50        include $(obj)/.initramfs_data.cpio.d
  51endif
  52
  53quiet_cmd_initfs = GEN     $@
  54      cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
  55
  56targets := initramfs_data.cpio.gz initramfs_data.cpio.bz2 initramfs_data.cpio.lzma initramfs_data.cpio.xz initramfs_data.cpio.lzo initramfs_data.cpio
  57# do not try to update files included in initramfs
  58$(deps_initramfs): ;
  59
  60$(deps_initramfs): klibcdirs
  61# We rebuild initramfs_data.cpio if:
  62# 1) Any included file is newer then initramfs_data.cpio
  63# 2) There are changes in which files are included (added or deleted)
  64# 3) If gen_init_cpio are newer than initramfs_data.cpio
  65# 4) arguments to gen_initramfs.sh changes
  66$(obj)/initramfs_data.cpio$(suffix_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
  67        $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d
  68        $(call if_changed,initfs)
  69
  70
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