blob: 044eb4f89a91f6ec5aed6616b9a1323e746e82fe [file] [log] [blame]
Sam Ravnborgf77bf012007-10-15 22:25:06 +02001# Backward compatibility
2asflags-y += $(EXTRA_AFLAGS)
3ccflags-y += $(EXTRA_CFLAGS)
4cppflags-y += $(EXTRA_CPPFLAGS)
5ldflags-y += $(EXTRA_LDFLAGS)
6
Sam Ravnborg720097d2009-04-19 11:04:26 +02007#
8# flags that take effect in sub directories
9export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y)
10export KBUILD_SUBDIR_CCFLAGS := $(KBUILD_SUBDIR_CCFLAGS) $(subdir-ccflags-y)
11
Linus Torvalds1da177e2005-04-16 15:20:36 -070012# Figure out what we need to build from the various variables
13# ===========================================================================
14
15# When an object is listed to be built compiled-in and modular,
16# only build the compiled-in version
17
18obj-m := $(filter-out $(obj-y),$(obj-m))
19
20# Libraries are always collected in one lib file.
21# Filter out objects already built-in
22
23lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
24
25
26# Handle objects in subdirs
27# ---------------------------------------------------------------------------
28# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
29# and add the directory to the list of dirs to descend into: $(subdir-y)
Masahiro Yamada38385f82014-04-28 16:26:18 +090030# o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
Linus Torvalds1da177e2005-04-16 15:20:36 -070031# and add the directory to the list of dirs to descend into: $(subdir-m)
32
Tejun Heo551559e2007-12-07 21:04:30 +090033# Determine modorder.
34# Unfortunately, we don't have information about ordering between -y
35# and -m subdirs. Just put -y's first.
36modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
37
Linus Torvalds1da177e2005-04-16 15:20:36 -070038__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
39subdir-y += $(__subdir-y)
40__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
41subdir-m += $(__subdir-m)
42obj-y := $(patsubst %/, %/built-in.o, $(obj-y))
43obj-m := $(filter-out %/, $(obj-m))
44
45# Subdirectories we need to descend into
46
47subdir-ym := $(sort $(subdir-y) $(subdir-m))
48
Masahiro Yamada38385f82014-04-28 16:26:18 +090049# if $(foo-objs) exists, foo.o is a composite object
Linus Torvalds1da177e2005-04-16 15:20:36 -070050multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
51multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
52multi-used := $(multi-used-y) $(multi-used-m)
53single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
54
55# Build list of the parts of our composite objects, our composite
56# objects depend on those (obviously)
57multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
58multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
59multi-objs := $(multi-objs-y) $(multi-objs-m)
60
Sam Ravnborgf5fb9762007-09-15 08:55:39 +020061# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
62# tell kbuild to descend
63subdir-obj-y := $(filter %/built-in.o, $(obj-y))
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
65# $(obj-dirs) is a list of directories that contain object files
张忠山4d47dde2013-06-30 17:09:28 +080066obj-dirs := $(dir $(multi-objs) $(obj-y))
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
68# Replace multi-part objects by their individual parts, look at local dir only
69real-objs-y := $(foreach m, $(filter-out $(subdir-obj-y), $(obj-y)), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) $(extra-y)
70real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
71
72# Add subdir path
73
74extra-y := $(addprefix $(obj)/,$(extra-y))
75always := $(addprefix $(obj)/,$(always))
76targets := $(addprefix $(obj)/,$(targets))
Tejun Heo551559e2007-12-07 21:04:30 +090077modorder := $(addprefix $(obj)/,$(modorder))
Linus Torvalds1da177e2005-04-16 15:20:36 -070078obj-y := $(addprefix $(obj)/,$(obj-y))
79obj-m := $(addprefix $(obj)/,$(obj-m))
80lib-y := $(addprefix $(obj)/,$(lib-y))
81subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
82real-objs-y := $(addprefix $(obj)/,$(real-objs-y))
83real-objs-m := $(addprefix $(obj)/,$(real-objs-m))
84single-used-m := $(addprefix $(obj)/,$(single-used-m))
85multi-used-y := $(addprefix $(obj)/,$(multi-used-y))
86multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
87multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y))
88multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m))
89subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
90obj-dirs := $(addprefix $(obj)/,$(obj-dirs))
91
Linus Torvalds1da177e2005-04-16 15:20:36 -070092# These flags are needed for modversions and compiling, so we define them here
93# already
Masahiro Yamada38385f82014-04-28 16:26:18 +090094# $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will
Linus Torvalds1da177e2005-04-16 15:20:36 -070095# end up in (or would, if it gets compiled in)
Michal Marek5bb05712012-01-08 21:54:43 +010096# Note: Files that end up in two or more modules are compiled without the
97# KBUILD_MODNAME definition. The reason is that any made-up name would
98# differ in different configs.
Ustyugov Romanf83b5e32005-09-23 08:42:11 +040099name-fix = $(subst $(comma),_,$(subst -,_,$1))
Sam Ravnborg5e8d7802006-07-01 09:58:02 +0200100basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))"
Ustyugov Romanf83b5e32005-09-23 08:42:11 +0400101modname_flags = $(if $(filter 1,$(words $(modname))),\
102 -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))")
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
Sam Ravnborg720097d2009-04-19 11:04:26 +0200104orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \
Sam Ravnborgd8672b42008-11-21 21:50:02 +0100105 $(ccflags-y) $(CFLAGS_$(basetarget).o)
Steven Rostedt656ee822008-05-14 21:30:29 -0400106_c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
Sam Ravnborg720097d2009-04-19 11:04:26 +0200107_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \
Sam Ravnborgd8672b42008-11-21 21:50:02 +0100108 $(asflags-y) $(AFLAGS_$(basetarget).o)
Sam Ravnborgf77bf012007-10-15 22:25:06 +0200109_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
Peter Oberparleiter2521f2c2009-06-17 16:28:08 -0700111#
112# Enable gcov profiling flags for a file, directory or for all files depending
113# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
114# (in this order)
115#
116ifeq ($(CONFIG_GCOV_KERNEL),y)
117_c_flags += $(if $(patsubst n%,, \
118 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
119 $(CFLAGS_GCOV))
120endif
121
Andrey Ryabinin0b24bec2015-02-13 14:39:17 -0800122#
123# Enable address sanitizer flags for kernel except some files or directories
124# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
125#
126ifeq ($(CONFIG_KASAN),y)
127_c_flags += $(if $(patsubst n%,, \
128 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
129 $(CFLAGS_KASAN))
130endif
131
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132# If building the kernel in a separate objtree expand all occurrences
133# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
134
135ifeq ($(KBUILD_SRC),)
136__c_flags = $(_c_flags)
137__a_flags = $(_a_flags)
138__cpp_flags = $(_cpp_flags)
139else
140
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141# -I$(obj) locates generated .h files
142# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
143# and locates generated .h files
144# FIXME: Replace both with specific CFLAGS* statements in the makefiles
145__c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags)
146__a_flags = $(call flags,_a_flags)
147__cpp_flags = $(call flags,_cpp_flags)
148endif
149
Sam Ravnborgd8672b42008-11-21 21:50:02 +0100150c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
151 $(__c_flags) $(modkern_cflags) \
Jason Baron52159d92010-09-17 11:09:17 -0400152 -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
Sam Ravnborgd8672b42008-11-21 21:50:02 +0100154a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 $(__a_flags) $(modkern_aflags)
156
Sam Ravnborgd8672b42008-11-21 21:50:02 +0100157cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
158 $(__cpp_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
Sam Ravnborgf77bf012007-10-15 22:25:06 +0200160ld_flags = $(LDFLAGS) $(ldflags-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
Ian Campbellb0a4d8b2013-05-31 11:14:20 +0100162dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \
Stephen Warrene570d7c2013-02-12 15:03:37 -0700163 -I$(srctree)/arch/$(SRCARCH)/boot/dts \
Stephen Warrenc58299a2013-02-20 13:39:41 -0700164 -I$(srctree)/arch/$(SRCARCH)/boot/dts/include \
Grant Likelyb5190512014-02-18 21:46:16 +0000165 -I$(srctree)/drivers/of/testcase-data \
Stephen Warrene570d7c2013-02-12 15:03:37 -0700166 -undef -D__DTS__
167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168# Finds the multi-part object the current object will be linked into
169modname-multi = $(sort $(foreach m,$(multi-used),\
170 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
171
Masahiro Yamadac8589d12014-08-19 16:34:20 +0900172# Useful for describing the dependency of composite objects
173# Usage:
174# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
175define multi_depend
176$(foreach m, $(notdir $1), \
177 $(eval $(obj)/$m: \
178 $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
179endef
180
Arnaud Lacombe7373f4f2011-05-23 00:04:43 -0400181ifdef REGENERATE_PARSERS
182
183# GPERF
184# ---------------------------------------------------------------------------
185quiet_cmd_gperf = GPERF $@
186 cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $<
187
Peter Foley58238c82011-07-31 14:45:40 -0400188.PRECIOUS: $(src)/%.hash.c_shipped
Arnaud Lacombe7373f4f2011-05-23 00:04:43 -0400189$(src)/%.hash.c_shipped: $(src)/%.gperf
190 $(call cmd,gperf)
191
192# LEX
193# ---------------------------------------------------------------------------
194LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
195
196quiet_cmd_flex = LEX $@
197 cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<
198
Peter Foley58238c82011-07-31 14:45:40 -0400199.PRECIOUS: $(src)/%.lex.c_shipped
Arnaud Lacombe7373f4f2011-05-23 00:04:43 -0400200$(src)/%.lex.c_shipped: $(src)/%.l
201 $(call cmd,flex)
202
203# YACC
204# ---------------------------------------------------------------------------
205YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
206
207quiet_cmd_bison = YACC $@
208 cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<
209
Peter Foley58238c82011-07-31 14:45:40 -0400210.PRECIOUS: $(src)/%.tab.c_shipped
Arnaud Lacombe7373f4f2011-05-23 00:04:43 -0400211$(src)/%.tab.c_shipped: $(src)/%.y
212 $(call cmd,bison)
213
214quiet_cmd_bison_h = YACC $@
215 cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<
216
Peter Foley58238c82011-07-31 14:45:40 -0400217.PRECIOUS: $(src)/%.tab.h_shipped
Arnaud Lacombe7373f4f2011-05-23 00:04:43 -0400218$(src)/%.tab.h_shipped: $(src)/%.y
219 $(call cmd,bison_h)
220
221endif
222
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223# Shipped files
224# ===========================================================================
225
226quiet_cmd_shipped = SHIPPED $@
227cmd_shipped = cat $< > $@
228
Arnaud Lacombe991d76c2011-06-07 13:09:28 -0400229$(obj)/%: $(src)/%_shipped
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 $(call cmd,shipped)
231
232# Commands useful for building a boot image
233# ===========================================================================
Masahiro Yamada38385f82014-04-28 16:26:18 +0900234#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235# Use as following:
236#
237# target: source(s) FORCE
238# $(if_changed,ld/objcopy/gzip)
239#
Sam Ravnborg836caba2007-09-30 20:34:36 +0200240# and add target to extra-y so that we know we have to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241# read in the saved command line
242
243# Linking
244# ---------------------------------------------------------------------------
245
246quiet_cmd_ld = LD $@
Sam Ravnborgf77bf012007-10-15 22:25:06 +0200247cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
Masahiro Yamada38385f82014-04-28 16:26:18 +0900248 $(filter-out FORCE,$^) -o $@
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
250# Objcopy
251# ---------------------------------------------------------------------------
252
253quiet_cmd_objcopy = OBJCOPY $@
254cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
255
256# Gzip
257# ---------------------------------------------------------------------------
258
259quiet_cmd_gzip = GZIP $@
Michal Marek6ae9ecb2011-03-31 15:47:55 +0200260cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
H. Peter Anvind3dd3b52009-05-05 21:17:15 -0700261 (rm -f $@ ; false)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
Dirk Brandewieaab94332010-12-22 11:57:26 -0800263# DTC
264# ---------------------------------------------------------------------------
265
266# Generate an assembly file to wrap the output of the device tree compiler
James Hogan1c00a472013-06-13 11:53:09 +0100267quiet_cmd_dt_S_dtb= DTB $@
Dirk Brandewieaab94332010-12-22 11:57:26 -0800268cmd_dt_S_dtb= \
269( \
270 echo '\#include <asm-generic/vmlinux.lds.h>'; \
271 echo '.section .dtb.init.rodata,"a"'; \
272 echo '.balign STRUCT_ALIGNMENT'; \
273 echo '.global __dtb_$(*F)_begin'; \
274 echo '__dtb_$(*F)_begin:'; \
275 echo '.incbin "$<" '; \
276 echo '__dtb_$(*F)_end:'; \
277 echo '.global __dtb_$(*F)_end'; \
278 echo '.balign STRUCT_ALIGNMENT'; \
279) > $@
280
281$(obj)/%.dtb.S: $(obj)/%.dtb
282 $(call cmd,dt_S_dtb)
283
284quiet_cmd_dtc = DTC $@
Stephen Warrenb40b25f2013-03-06 10:58:37 -0700285cmd_dtc = $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
286 $(objtree)/scripts/dtc/dtc -O dtb -o $@ -b 0 \
Matthijs Kooijmanad061562013-05-08 12:59:04 +0200287 -i $(dir $<) $(DTC_FLAGS) \
Ian Campbellb0a4d8b2013-05-31 11:14:20 +0100288 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
289 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
Stephen Warren90b335f2012-11-27 16:29:10 -0700291$(obj)/%.dtb: $(src)/%.dts FORCE
292 $(call if_changed_dep,dtc)
293
Ian Campbellb0a4d8b2013-05-31 11:14:20 +0100294dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
Stephen Warren22435f32013-02-05 12:06:28 -0700295
Alain Knaffbc22c172009-01-04 22:46:16 +0100296# Bzip2
297# ---------------------------------------------------------------------------
298
H. Peter Anvind3dd3b52009-05-05 21:17:15 -0700299# Bzip2 and LZMA do not include size in file... so we have to fake that;
300# append the size as a 32-bit littleendian number as gzip does.
Michael Tokarev4a2ff672009-10-13 22:22:46 +0200301size_append = printf $(shell \
H. Peter Anvind3dd3b52009-05-05 21:17:15 -0700302dec_size=0; \
303for F in $1; do \
304 fsize=$$(stat -c "%s" $$F); \
305 dec_size=$$(expr $$dec_size + $$fsize); \
306done; \
Jonathan Nieder13734112009-12-28 19:38:27 +0000307printf "%08x\n" $$dec_size | \
308 sed 's/\(..\)/\1 /g' | { \
309 read ch0 ch1 ch2 ch3; \
310 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
311 printf '%s%03o' '\\' $$((0x$$ch)); \
312 done; \
313 } \
H. Peter Anvind3dd3b52009-05-05 21:17:15 -0700314)
Alain Knaffbc22c172009-01-04 22:46:16 +0100315
H. Peter Anvind3dd3b52009-05-05 21:17:15 -0700316quiet_cmd_bzip2 = BZIP2 $@
317cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
318 bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
319 (rm -f $@ ; false)
Alain Knaffbc22c172009-01-04 22:46:16 +0100320
321# Lzma
322# ---------------------------------------------------------------------------
323
324quiet_cmd_lzma = LZMA $@
H. Peter Anvind3dd3b52009-05-05 21:17:15 -0700325cmd_lzma = (cat $(filter-out FORCE,$^) | \
326 lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
327 (rm -f $@ ; false)
Albin Tonnerre7dd65fe2010-01-08 14:42:42 -0800328
Wu Zhangjin2d74b2c2010-03-11 17:42:14 +0800329quiet_cmd_lzo = LZO $@
Albin Tonnerre7dd65fe2010-01-08 14:42:42 -0800330cmd_lzo = (cat $(filter-out FORCE,$^) | \
331 lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
332 (rm -f $@ ; false)
Borislav Petkovd61931d2010-03-05 17:34:46 +0100333
Kyungsik Leee76e1fd2013-07-08 16:01:46 -0700334quiet_cmd_lz4 = LZ4 $@
335cmd_lz4 = (cat $(filter-out FORCE,$^) | \
336 lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
337 (rm -f $@ ; false)
338
Stephen Warrene3393642012-03-16 15:03:55 -0600339# U-Boot mkimage
340# ---------------------------------------------------------------------------
341
342MKIMAGE := $(srctree)/scripts/mkuboot.sh
343
344# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
345# the number of overrides in arch makefiles
346UIMAGE_ARCH ?= $(SRCARCH)
347UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
348UIMAGE_OPTS-y ?=
349UIMAGE_TYPE ?= kernel
350UIMAGE_LOADADDR ?= arch_must_set_this
351UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
352UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
353UIMAGE_IN ?= $<
354UIMAGE_OUT ?= $@
355
356quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT)
357 cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
358 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
359 -T $(UIMAGE_TYPE) \
360 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
361 -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
362
Lasse Collin24fa0402011-01-12 17:01:22 -0800363# XZ
364# ---------------------------------------------------------------------------
365# Use xzkern to compress the kernel image and xzmisc to compress other things.
366#
367# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
368# of the kernel decompressor. A BCJ filter is used if it is available for
369# the target architecture. xzkern also appends uncompressed size of the data
370# using size_append. The .xz format has the size information available at
371# the end of the file too, but it's in more complex format and it's good to
372# avoid changing the part of the boot code that reads the uncompressed size.
373# Note that the bytes added by size_append will make the xz tool think that
374# the file is corrupt. This is expected.
375#
376# xzmisc doesn't use size_append, so it can be used to create normal .xz
377# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
378# big dictionary would increase the memory usage too much in the multi-call
379# decompression mode. A BCJ filter isn't used either.
380quiet_cmd_xzkern = XZKERN $@
381cmd_xzkern = (cat $(filter-out FORCE,$^) | \
382 sh $(srctree)/scripts/xz_wrap.sh && \
383 $(call size_append, $(filter-out FORCE,$^))) > $@ || \
384 (rm -f $@ ; false)
385
386quiet_cmd_xzmisc = XZMISC $@
387cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
388 xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
389 (rm -f $@ ; false)