LXR linux/usr/Makefile

   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_$(CONFIG_INITRAMFS_COMPRESSION_LZMA)   = .lzma
  17
  18# Generate builtin.o based on initramfs_data.o
  19obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data$(suffix_y).o
  20
  21# initramfs_data.o contains the compressed initramfs_data.cpio image.
  22# The image is included using .incbin, a dependency which is not
  23# tracked automatically.
  24$(obj)/initramfs_data$(suffix_y).o: $(obj)/initramfs_data.cpio$(suffix_y) FORCE
  25
  26#####
  27# Generate the initramfs cpio archive
  28
  29hostprogs-y := gen_init_cpio
  30initramfs   := $(CONFIG_SHELL) $(srctree)/scripts/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 $(CONFIG_INITRAMFS_ROOT_GID))
  36
  37# .initramfs_data.cpio.d is used to identify all files included
  38# in initramfs and to detect if any files are added/removed.
  39# Removed files are identified by directory timestamp being updated
  40# The dependency list is generated by gen_initramfs.sh -l
  41ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),)
  42        include $(obj)/.initramfs_data.cpio.d
  43endif
  44
  45quiet_cmd_initfs = GEN     $@
  46      cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
  47
  48targets := initramfs_data.cpio.gz initramfs_data.cpio.bz2 initramfs_data.cpio.lzma initramfs_data.cpio
  49# do not try to update files included in initramfs
  50$(deps_initramfs): ;
  51
  52$(deps_initramfs): klibcdirs
  53# We rebuild initramfs_data.cpio if:
  54# 1) Any included file is newer then initramfs_data.cpio
  55# 2) There are changes in which files are included (added or deleted)
  56# 3) If gen_init_cpio are newer than initramfs_data.cpio
  57# 4) arguments to gen_initramfs.sh changes
  58$(obj)/initramfs_data.cpio$(suffix_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
  59        $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d
  60        $(call if_changed,initfs)
  61
  62