usr/Makefile

   1 #
   2 # kbuild file for usr/ - including initramfs image
   3 #
   4
   5 klibcdirs:;
   6 PHONY += klibcdirs
   7
   8
   9 # Bzip2
  10 suffix_$(CONFIG_RD_BZIP2)  = .bz2
  11
  12 # Lzma
  13 suffix_$(CONFIG_RD_LZMA)   = .lzma
  14
  15 # XZ
  16 suffix_$(CONFIG_RD_XZ)     = .xz
  17
  18 # Lzo
  19 suffix_$(CONFIG_RD_LZO)    = .lzo
  20
  21 # Lz4
  22 suffix_$(CONFIG_RD_LZ4)    = .lz4
  23
  24 # Gzip
  25 suffix_$(CONFIG_RD_GZIP)   = .gz
  26
  27 AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/initramfs_data.cpio$(suffix_y)"
  28
  29 # Generate builtin.o based on initramfs_data.o
  30 obj-$(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
  40 hostprogs-y := gen_init_cpio
  41 initramfs   := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
  42 ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
  43                         $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
  44 ramfs-args  := \
  45         $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
  46         $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
  47
  48 # .initramfs_data.cpio.d is used to identify all files included
  49 # in initramfs and to detect if any files are added/removed.
  50 # Removed files are identified by directory timestamp being updated
  51 # The dependency list is generated by gen_initramfs.sh -l
  52 ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),)
  53         include $(obj)/.initramfs_data.cpio.d
  54 endif
  55
  56 quiet_cmd_initfs = GEN     $@
  57       cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
  58
  59 targets := 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)