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61 lines
2.1 KiB
61 lines
2.1 KiB
# SPDX-License-Identifier: GPL-2.0
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#
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# kbuild file for usr/ - including initramfs image
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#
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klibcdirs:;
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PHONY += klibcdirs
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suffix_y = $(subst $\",,$(CONFIG_INITRAMFS_COMPRESSION))
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datafile_y = initramfs_data.cpio$(suffix_y)
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datafile_d_y = .$(datafile_y).d
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AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/$(datafile_y)"
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# clean rules do not have CONFIG_INITRAMFS_COMPRESSION. So clean up after all
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# possible compression formats.
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clean-files += initramfs_data.cpio*
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# Generate builtin.o based on initramfs_data.o
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obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
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# initramfs_data.o contains the compressed initramfs_data.cpio image.
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# The image is included using .incbin, a dependency which is not
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# tracked automatically.
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$(obj)/initramfs_data.o: $(obj)/$(datafile_y) FORCE
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#####
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# Generate the initramfs cpio archive
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hostprogs-y := gen_init_cpio
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initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
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ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
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$(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
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ramfs-args := \
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$(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
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$(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
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# $(datafile_d_y) is used to identify all files included
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# in initramfs and to detect if any files are added/removed.
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# Removed files are identified by directory timestamp being updated
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# The dependency list is generated by gen_initramfs.sh -l
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ifneq ($(wildcard $(obj)/$(datafile_d_y)),)
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include $(obj)/$(datafile_d_y)
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endif
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quiet_cmd_initfs = GEN $@
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cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
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targets := $(datafile_y)
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# do not try to update files included in initramfs
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$(deps_initramfs): ;
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$(deps_initramfs): klibcdirs
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# We rebuild initramfs_data.cpio if:
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# 1) Any included file is newer then initramfs_data.cpio
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# 2) There are changes in which files are included (added or deleted)
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# 3) If gen_init_cpio are newer than initramfs_data.cpio
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# 4) arguments to gen_initramfs.sh changes
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$(obj)/$(datafile_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
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$(Q)$(initramfs) -l $(ramfs-input) > $(obj)/$(datafile_d_y)
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$(call if_changed,initfs)
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