2006-04-11 13:24:32 +02:00
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#
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# kbuild file for usr/ - including initramfs image
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#
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2005-04-16 15:20:36 -07:00
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2006-04-11 13:24:32 +02:00
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klibcdirs:;
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2006-07-23 19:37:44 +02:00
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PHONY += klibcdirs
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2009-01-07 00:10:27 -08:00
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# Bzip2
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2013-11-12 15:10:22 -08:00
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suffix_$(CONFIG_RD_BZIP2) = .bz2
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2009-01-07 00:10:27 -08:00
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2009-02-19 13:43:51 -08:00
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# Lzma
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2013-11-12 15:10:22 -08:00
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suffix_$(CONFIG_RD_LZMA) = .lzma
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2005-04-16 15:20:36 -07:00
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decompressors: add boot-time XZ support
This implements the API defined in <linux/decompress/generic.h> which is
used for kernel, initramfs, and initrd decompression. This patch together
with the first patch is enough for XZ-compressed initramfs and initrd;
XZ-compressed kernel will need arch-specific changes.
The buffering requirements described in decompress_unxz.c are stricter
than with gzip, so the relevant changes should be done to the
arch-specific code when adding support for XZ-compressed kernel.
Similarly, the heap size in arch-specific pre-boot code may need to be
increased (30 KiB is enough).
The XZ decompressor needs memmove(), memeq() (memcmp() == 0), and
memzero() (memset(ptr, 0, size)), which aren't available in all
arch-specific pre-boot environments. I'm including simple versions in
decompress_unxz.c, but a cleaner solution would naturally be nicer.
Signed-off-by: Lasse Collin <lasse.collin@tukaani.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Alain Knaff <alain@knaff.lu>
Cc: Albin Tonnerre <albin.tonnerre@free-electrons.com>
Cc: Phillip Lougher <phillip@lougher.demon.co.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-01-12 17:01:23 -08:00
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# XZ
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2013-11-12 15:10:22 -08:00
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suffix_$(CONFIG_RD_XZ) = .xz
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decompressors: add boot-time XZ support
This implements the API defined in <linux/decompress/generic.h> which is
used for kernel, initramfs, and initrd decompression. This patch together
with the first patch is enough for XZ-compressed initramfs and initrd;
XZ-compressed kernel will need arch-specific changes.
The buffering requirements described in decompress_unxz.c are stricter
than with gzip, so the relevant changes should be done to the
arch-specific code when adding support for XZ-compressed kernel.
Similarly, the heap size in arch-specific pre-boot code may need to be
increased (30 KiB is enough).
The XZ decompressor needs memmove(), memeq() (memcmp() == 0), and
memzero() (memset(ptr, 0, size)), which aren't available in all
arch-specific pre-boot environments. I'm including simple versions in
decompress_unxz.c, but a cleaner solution would naturally be nicer.
Signed-off-by: Lasse Collin <lasse.collin@tukaani.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Alain Knaff <alain@knaff.lu>
Cc: Albin Tonnerre <albin.tonnerre@free-electrons.com>
Cc: Phillip Lougher <phillip@lougher.demon.co.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-01-12 17:01:23 -08:00
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2010-05-26 14:44:28 -07:00
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# Lzo
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2013-11-12 15:10:22 -08:00
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suffix_$(CONFIG_RD_LZO) = .lzo
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# Lz4
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suffix_$(CONFIG_RD_LZ4) = .lz4
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# Gzip
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suffix_$(CONFIG_RD_GZIP) = .gz
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2010-05-26 14:44:28 -07:00
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2010-09-17 15:24:09 -07:00
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AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/initramfs_data.cpio$(suffix_y)"
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2006-04-11 13:24:32 +02:00
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# Generate builtin.o based on initramfs_data.o
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2010-09-17 15:24:09 -07:00
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obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
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2005-04-16 15:20:36 -07:00
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2009-01-07 00:10:27 -08:00
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# initramfs_data.o contains the compressed initramfs_data.cpio image.
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2005-04-16 15:20:36 -07:00
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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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2010-09-17 15:24:09 -07:00
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$(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio$(suffix_y) FORCE
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2005-04-16 15:20:36 -07:00
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2006-04-11 13:24:32 +02:00
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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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2006-11-25 11:09:18 -08:00
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$(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
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2006-04-11 13:24:32 +02:00
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ramfs-args := \
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$(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
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2006-06-09 21:24:14 +04:00
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$(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
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2006-04-11 13:24:32 +02:00
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2009-01-07 00:10:27 -08:00
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# .initramfs_data.cpio.d is used to identify all files included
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2006-04-11 13:24:32 +02:00
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# in initramfs and to detect if any files are added/removed.
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# Removed files are identified by directory timestamp being updated
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# The dependency list is generated by gen_initramfs.sh -l
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2009-01-07 00:10:27 -08:00
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ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),)
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include $(obj)/.initramfs_data.cpio.d
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2005-04-16 15:20:36 -07:00
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endif
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2006-04-11 13:24:32 +02:00
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quiet_cmd_initfs = GEN $@
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cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
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2013-11-12 15:10:22 -08:00
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targets := initramfs_data.cpio.gz initramfs_data.cpio.bz2 \
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initramfs_data.cpio.lzma initramfs_data.cpio.xz \
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initramfs_data.cpio.lzo initramfs_data.cpio.lz4 \
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initramfs_data.cpio
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2006-08-07 20:58:28 +02:00
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# do not try to update files included in initramfs
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$(deps_initramfs): ;
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2006-04-11 13:24:32 +02:00
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$(deps_initramfs): klibcdirs
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2009-01-07 00:10:27 -08:00
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# We rebuild initramfs_data.cpio if:
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# 1) Any included file is newer then initramfs_data.cpio
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2006-04-11 13:24:32 +02:00
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# 2) There are changes in which files are included (added or deleted)
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2009-01-07 00:10:27 -08:00
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# 3) If gen_init_cpio are newer than initramfs_data.cpio
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2006-04-11 13:24:32 +02:00
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# 4) arguments to gen_initramfs.sh changes
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2009-01-07 00:10:27 -08:00
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$(obj)/initramfs_data.cpio$(suffix_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
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$(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d
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2006-04-11 13:24:32 +02:00
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$(call if_changed,initfs)
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