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-rw-r--r--usr/Makefile85
1 files changed, 85 insertions, 0 deletions
diff --git a/usr/Makefile b/usr/Makefile
new file mode 100644
index 0000000000..f8e1ad19e0
--- /dev/null
+++ b/usr/Makefile
@@ -0,0 +1,85 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# kbuild file for usr/ - including initramfs image
+#
+
+compress-y := copy
+compress-$(CONFIG_INITRAMFS_COMPRESSION_GZIP) := gzip
+compress-$(CONFIG_INITRAMFS_COMPRESSION_BZIP2) := bzip2
+compress-$(CONFIG_INITRAMFS_COMPRESSION_LZMA) := lzma
+compress-$(CONFIG_INITRAMFS_COMPRESSION_XZ) := xzmisc
+compress-$(CONFIG_INITRAMFS_COMPRESSION_LZO) := lzo
+compress-$(CONFIG_INITRAMFS_COMPRESSION_LZ4) := lz4
+compress-$(CONFIG_INITRAMFS_COMPRESSION_ZSTD) := zstd
+
+obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
+
+$(obj)/initramfs_data.o: $(obj)/initramfs_inc_data
+
+ramfs-input := $(CONFIG_INITRAMFS_SOURCE)
+cpio-data :=
+
+# If CONFIG_INITRAMFS_SOURCE is empty, generate a small initramfs with the
+# default contents.
+ifeq ($(ramfs-input),)
+ramfs-input := $(srctree)/$(src)/default_cpio_list
+endif
+
+ifeq ($(words $(ramfs-input)),1)
+
+# If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with
+# .cpio, use it directly as an initramfs.
+ifneq ($(filter %.cpio,$(ramfs-input)),)
+cpio-data := $(ramfs-input)
+endif
+
+# If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with
+# .cpio.*, use it directly as an initramfs, and avoid double compression.
+ifeq ($(words $(subst .cpio.,$(space),$(ramfs-input))),2)
+cpio-data := $(ramfs-input)
+compress-y := copy
+endif
+
+endif
+
+# For other cases, generate the initramfs cpio archive based on the contents
+# specified by CONFIG_INITRAMFS_SOURCE.
+ifeq ($(cpio-data),)
+
+cpio-data := $(obj)/initramfs_data.cpio
+
+hostprogs := gen_init_cpio
+
+# .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
+-include $(obj)/.initramfs_data.cpio.d
+
+# do not try to update files included in initramfs
+$(deps_initramfs): ;
+
+quiet_cmd_initfs = GEN $@
+ cmd_initfs = \
+ $(CONFIG_SHELL) $< -o $@ -l $(obj)/.initramfs_data.cpio.d \
+ $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
+ $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) \
+ $(if $(KBUILD_BUILD_TIMESTAMP), -d "$(KBUILD_BUILD_TIMESTAMP)") \
+ $(ramfs-input)
+
+# We rebuild initramfs_data.cpio if:
+# 1) Any included file is newer than initramfs_data.cpio
+# 2) There are changes in which files are included (added or deleted)
+# 3) If gen_init_cpio are newer than initramfs_data.cpio
+# 4) Arguments to gen_initramfs.sh changes
+$(obj)/initramfs_data.cpio: $(src)/gen_initramfs.sh $(obj)/gen_init_cpio $(deps_initramfs) FORCE
+ $(call if_changed,initfs)
+
+endif
+
+$(obj)/initramfs_inc_data: $(cpio-data) FORCE
+ $(call if_changed,$(compress-y))
+
+targets += initramfs_data.cpio initramfs_inc_data
+
+subdir-$(CONFIG_UAPI_HEADER_TEST) += include