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-rw-r--r--usr/Makefile74
1 files changed, 74 insertions, 0 deletions
diff --git a/usr/Makefile b/usr/Makefile
new file mode 100644
index 000000000..e767f019a
--- /dev/null
+++ b/usr/Makefile
@@ -0,0 +1,74 @@
+#
+# kbuild file for usr/ - including initramfs image
+#
+
+klibcdirs:;
+PHONY += klibcdirs
+
+
+# Bzip2
+suffix_$(CONFIG_RD_BZIP2) = .bz2
+
+# Lzma
+suffix_$(CONFIG_RD_LZMA) = .lzma
+
+# XZ
+suffix_$(CONFIG_RD_XZ) = .xz
+
+# Lzo
+suffix_$(CONFIG_RD_LZO) = .lzo
+
+# Lz4
+suffix_$(CONFIG_RD_LZ4) = .lz4
+
+# Gzip
+suffix_$(CONFIG_RD_GZIP) = .gz
+
+AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/initramfs_data.cpio$(suffix_y)"
+
+# Generate builtin.o based on initramfs_data.o
+obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
+
+# initramfs_data.o contains the compressed initramfs_data.cpio image.
+# The image is included using .incbin, a dependency which is not
+# tracked automatically.
+$(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio$(suffix_y) FORCE
+
+#####
+# Generate the initramfs cpio archive
+
+hostprogs-y := gen_init_cpio
+initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
+ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
+ $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
+ramfs-args := \
+ $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
+ $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
+
+# .initramfs_data.cpio.d is used to identify all files included
+# in initramfs and to detect if any files are added/removed.
+# Removed files are identified by directory timestamp being updated
+# The dependency list is generated by gen_initramfs.sh -l
+ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),)
+ include $(obj)/.initramfs_data.cpio.d
+endif
+
+quiet_cmd_initfs = GEN $@
+ cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
+
+targets := initramfs_data.cpio.gz initramfs_data.cpio.bz2 \
+ initramfs_data.cpio.lzma initramfs_data.cpio.xz \
+ initramfs_data.cpio.lzo initramfs_data.cpio.lz4 \
+ initramfs_data.cpio
+# do not try to update files included in initramfs
+$(deps_initramfs): ;
+
+$(deps_initramfs): klibcdirs
+# We rebuild initramfs_data.cpio if:
+# 1) Any included file is newer then initramfs_data.cpio
+# 2) There are changes in which files are included (added or deleted)
+# 3) If gen_init_cpio are newer than initramfs_data.cpio
+# 4) arguments to gen_initramfs.sh changes
+$(obj)/initramfs_data.cpio$(suffix_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
+ $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d
+ $(call if_changed,initfs)