scripts/Makefile.lib

   1 #
   2 # SPDX-License-Identifier:      GPL-2.0
   3 #
   4 # Backward compatibility
   5 asflags-y  += $(EXTRA_AFLAGS)
   6 ccflags-y  += $(EXTRA_CFLAGS)
   7 cppflags-y += $(EXTRA_CPPFLAGS)
   8 ldflags-y  += $(EXTRA_LDFLAGS)
   9
  10 #
  11 # flags that take effect in sub directories
  12 export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y)
  13 export KBUILD_SUBDIR_CCFLAGS := $(KBUILD_SUBDIR_CCFLAGS) $(subdir-ccflags-y)
  14
  15 # Figure out what we need to build from the various variables
  16 # ===========================================================================
  17
  18 # When an object is listed to be built compiled-in and modular,
  19 # only build the compiled-in version
  20
  21 obj-m := $(filter-out $(obj-y),$(obj-m))
  22
  23 # Libraries are always collected in one lib file.
  24 # Filter out objects already built-in
  25
  26 lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
  27
  28
  29 # Handle objects in subdirs
  30 # ---------------------------------------------------------------------------
  31 # o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
  32 #   and add the directory to the list of dirs to descend into: $(subdir-y)
  33 # o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
  34 #   and add the directory to the list of dirs to descend into: $(subdir-m)
  35
  36 # Determine modorder.
  37 # Unfortunately, we don't have information about ordering between -y
  38 # and -m subdirs.  Just put -y's first.
  39 modorder        := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
  40
  41 __subdir-y      := $(patsubst %/,%,$(filter %/, $(obj-y)))
  42 subdir-y        += $(__subdir-y)
  43 __subdir-m      := $(patsubst %/,%,$(filter %/, $(obj-m)))
  44 subdir-m        += $(__subdir-m)
  45 obj-y           := $(patsubst %/, %/built-in.o, $(obj-y))
  46 obj-m           := $(filter-out %/, $(obj-m))
  47
  48 # Subdirectories we need to descend into
  49
  50 subdir-ym       := $(sort $(subdir-y) $(subdir-m))
  51
  52 # if $(foo-objs) exists, foo.o is a composite object
  53 multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
  54 multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
  55 multi-used   := $(multi-used-y) $(multi-used-m)
  56 single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
  57
  58 # Build list of the parts of our composite objects, our composite
  59 # objects depend on those (obviously)
  60 multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
  61 multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
  62 multi-objs   := $(multi-objs-y) $(multi-objs-m)
  63
  64 # $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
  65 # tell kbuild to descend
  66 subdir-obj-y := $(filter %/built-in.o, $(obj-y))
  67
  68 # $(obj-dirs) is a list of directories that contain object files
  69 obj-dirs := $(dir $(multi-objs) $(obj-y))
  70
  71 # Replace multi-part objects by their individual parts, look at local dir only
  72 real-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)
  73 real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
  74
  75 # Add subdir path
  76
  77 extra-y         := $(addprefix $(obj)/,$(extra-y))
  78 always          := $(addprefix $(obj)/,$(always))
  79 targets         := $(addprefix $(obj)/,$(targets))
  80 modorder        := $(addprefix $(obj)/,$(modorder))
  81 obj-y           := $(addprefix $(obj)/,$(obj-y))
  82 obj-m           := $(addprefix $(obj)/,$(obj-m))
  83 lib-y           := $(addprefix $(obj)/,$(lib-y))
  84 subdir-obj-y    := $(addprefix $(obj)/,$(subdir-obj-y))
  85 real-objs-y     := $(addprefix $(obj)/,$(real-objs-y))
  86 real-objs-m     := $(addprefix $(obj)/,$(real-objs-m))
  87 single-used-m   := $(addprefix $(obj)/,$(single-used-m))
  88 multi-used-y    := $(addprefix $(obj)/,$(multi-used-y))
  89 multi-used-m    := $(addprefix $(obj)/,$(multi-used-m))
  90 multi-objs-y    := $(addprefix $(obj)/,$(multi-objs-y))
  91 multi-objs-m    := $(addprefix $(obj)/,$(multi-objs-m))
  92 subdir-ym       := $(addprefix $(obj)/,$(subdir-ym))
  93 obj-dirs        := $(addprefix $(obj)/,$(obj-dirs))
  94
  95 # These flags are needed for modversions and compiling, so we define them here
  96 # already
  97 # $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will
  98 # end up in (or would, if it gets compiled in)
  99 # Note: Files that end up in two or more modules are compiled without the
 100 #       KBUILD_MODNAME definition. The reason is that any made-up name would
 101 #       differ in different configs.
 102 name-fix = $(subst $(comma),_,$(subst -,_,$1))
 103 basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))"
 104 modname_flags  = $(if $(filter 1,$(words $(modname))),\
 105                  -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))")
 106
 107 orig_c_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \
 108                  $(ccflags-y) $(CFLAGS_$(basetarget).o)
 109 _c_flags       = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
 110 orig_a_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \
 111                  $(asflags-y) $(AFLAGS_$(basetarget).o)
 112 _a_flags       = $(filter-out $(AFLAGS_REMOVE_$(basetarget).o), $(orig_a_flags))
 113 _cpp_flags     = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
 114
 115 #
 116 # Enable gcov profiling flags for a file, directory or for all files depending
 117 # on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
 118 # (in this order)
 119 #
 120 ifeq ($(CONFIG_GCOV_KERNEL),y)
 121 _c_flags += $(if $(patsubst n%,, \
 122                 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
 123                 $(CFLAGS_GCOV))
 124 endif
 125
 126 #
 127 # Enable address sanitizer flags for kernel except some files or directories
 128 # we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
 129 #
 130 ifeq ($(CONFIG_KASAN),y)
 131 _c_flags += $(if $(patsubst n%,, \
 132                 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
 133                 $(CFLAGS_KASAN))
 134 endif
 135
 136 # If building the kernel in a separate objtree expand all occurrences
 137 # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
 138
 139 ifeq ($(KBUILD_SRC),)
 140 __c_flags       = $(_c_flags)
 141 __a_flags       = $(_a_flags)
 142 __cpp_flags     = $(_cpp_flags)
 143 else
 144
 145 # -I$(obj) locates generated .h files
 146 # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
 147 #   and locates generated .h files
 148 # FIXME: Replace both with specific CFLAGS* statements in the makefiles
 149 __c_flags       = $(call addtree,-I$(obj)) $(call flags,_c_flags)
 150 __a_flags       =                          $(call flags,_a_flags)
 151 __cpp_flags     =                          $(call flags,_cpp_flags)
 152 endif
 153
 154 # Modified for U-Boot: LINUXINCLUDE -> UBOOTINCLUDE
 155 c_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(UBOOTINCLUDE)     \
 156                  $(__c_flags) $(modkern_cflags)                           \
 157                  -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags)
 158
 159 a_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(UBOOTINCLUDE)     \
 160                  $(__a_flags) $(modkern_aflags)
 161
 162 cpp_flags      = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(UBOOTINCLUDE)     \
 163                  $(__cpp_flags)
 164
 165 ld_flags       = $(LDFLAGS) $(ldflags-y)
 166
 167 dts_dir = $(srctree)/arch/$(ARCH)/dts
 168
 169 # Try these files in order to find the U-Boot-specific .dtsi include file
 170 u_boot_dtsi_options = $(wildcard $(dts_dir)/$(basename $(notdir $<))-u-boot.dtsi) \
 171         $(wildcard $(dts_dir)/$(subst $\",,$(CONFIG_SYS_SOC))-u-boot.dtsi) \
 172         $(wildcard $(dts_dir)/$(subst $\",,$(CONFIG_SYS_CPU))-u-boot.dtsi) \
 173         $(wildcard $(dts_dir)/$(subst $\",,$(CONFIG_SYS_VENDOR))-u-boot.dtsi) \
 174         $(wildcard $(dts_dir)/u-boot.dtsi)
 175
 176 # Uncomment for debugging
 177 # $(warning u_boot_dtsi_options: $(u_boot_dtsi_options))
 178
 179 # We use the first match
 180 u_boot_dtsi = $(firstword $(u_boot_dtsi_options))
 181
 182 # Modified for U-Boot
 183 dtc_cpp_flags  = -Wp,-MD,$(depfile).pre.tmp -nostdinc                    \
 184                  -I$(srctree)/arch/$(ARCH)/dts                           \
 185                  -I$(srctree)/arch/$(ARCH)/dts/include                   \
 186                  -Iinclude                                               \
 187                  -I$(srctree)/include                                    \
 188                  -I$(srctree)/arch/$(ARCH)/include                       \
 189                  -include $(srctree)/include/linux/kconfig.h             \
 190                  -D__ASSEMBLY__                                          \
 191                  -undef -D__DTS__
 192
 193 # Finds the multi-part object the current object will be linked into
 194 modname-multi = $(sort $(foreach m,$(multi-used),\
 195                 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
 196
 197 # Useful for describing the dependency of composite objects
 198 # Usage:
 199 #   $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
 200 define multi_depend
 201 $(foreach m, $(notdir $1), \
 202         $(eval $(obj)/$m: \
 203         $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
 204 endef
 205
 206 ifdef REGENERATE_PARSERS
 207
 208 # GPERF
 209 # ---------------------------------------------------------------------------
 210 quiet_cmd_gperf = GPERF $@
 211       cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $<
 212
 213 .PRECIOUS: $(src)/%.hash.c_shipped
 214 $(src)/%.hash.c_shipped: $(src)/%.gperf
 215         $(call cmd,gperf)
 216
 217 # LEX
 218 # ---------------------------------------------------------------------------
 219 LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
 220
 221 quiet_cmd_flex = LEX     $@
 222       cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<
 223
 224 .PRECIOUS: $(src)/%.lex.c_shipped
 225 $(src)/%.lex.c_shipped: $(src)/%.l
 226         $(call cmd,flex)
 227
 228 # YACC
 229 # ---------------------------------------------------------------------------
 230 YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
 231
 232 quiet_cmd_bison = YACC    $@
 233       cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<
 234
 235 .PRECIOUS: $(src)/%.tab.c_shipped
 236 $(src)/%.tab.c_shipped: $(src)/%.y
 237         $(call cmd,bison)
 238
 239 quiet_cmd_bison_h = YACC    $@
 240       cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<
 241
 242 .PRECIOUS: $(src)/%.tab.h_shipped
 243 $(src)/%.tab.h_shipped: $(src)/%.y
 244         $(call cmd,bison_h)
 245
 246 endif
 247
 248 # Shipped files
 249 # ===========================================================================
 250
 251 quiet_cmd_shipped = SHIPPED $@
 252 cmd_shipped = cat $< > $@
 253
 254 $(obj)/%: $(src)/%_shipped
 255         $(call cmd,shipped)
 256
 257 # Commands useful for building a boot image
 258 # ===========================================================================
 259 #
 260 #       Use as following:
 261 #
 262 #       target: source(s) FORCE
 263 #               $(if_changed,ld/objcopy/gzip)
 264 #
 265 #       and add target to extra-y so that we know we have to
 266 #       read in the saved command line
 267
 268 # Linking
 269 # ---------------------------------------------------------------------------
 270
 271 quiet_cmd_ld = LD      $@
 272 cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
 273                $(filter-out FORCE,$^) -o $@
 274
 275 # Objcopy
 276 # ---------------------------------------------------------------------------
 277
 278 quiet_cmd_objcopy = OBJCOPY $@
 279 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
 280
 281 # Gzip
 282 # ---------------------------------------------------------------------------
 283
 284 quiet_cmd_gzip = GZIP    $@
 285 cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
 286         (rm -f $@ ; false)
 287
 288 # DTC
 289 # ---------------------------------------------------------------------------
 290
 291 # Generate an assembly file to wrap the output of the device tree compiler
 292 quiet_cmd_dt_S_dtb= DTB     $@
 293 # Modified for U-Boot
 294 cmd_dt_S_dtb=                                           \
 295 (                                                       \
 296         echo '.section .dtb.init.rodata,"a"';           \
 297         echo '.balign 16';                              \
 298         echo '.global __dtb_$(subst -,_,$(*F))_begin';  \
 299         echo '__dtb_$(subst -,_,$(*F))_begin:';         \
 300         echo '.incbin "$<" ';                           \
 301         echo '__dtb_$(subst -,_,$(*F))_end:';           \
 302         echo '.global __dtb_$(subst -,_,$(*F))_end';    \
 303         echo '.balign 16';                              \
 304 ) > $@
 305
 306 $(obj)/%.dtb.S: $(obj)/%.dtb
 307         $(call cmd,dt_S_dtb)
 308
 309 quiet_cmd_dtc = DTC     $@
 310 # Modified for U-Boot
 311 # Bring in any U-Boot-specific include after the '/dts-v1/;' header
 312 cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
 313         cat $< $(if $(u_boot_dtsi),\
 314                 | sed 's%^/ {$$%\#include \"$(u_boot_dtsi)\"\n&%')  | \
 315                 $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) - ; \
 316         $(DTC) -O dtb -o $@ -b 0 \
 317                 -i $(dir $<) $(DTC_FLAGS) \
 318                 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
 319         cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
 320
 321 $(obj)/%.dtb: $(src)/%.dts FORCE
 322         $(call if_changed_dep,dtc)
 323
 324 dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
 325
 326 # Fonts
 327 # ---------------------------------------------------------------------------
 328
 329 # Generate an assembly file to wrap the font data
 330 quiet_cmd_S_ttf= TTF     $@
 331 # Modified for U-Boot
 332 cmd_S_ttf=                                              \
 333 (                                                       \
 334         echo '.section .rodata.ttf.init,"a"';           \
 335         echo '.balign 16';                              \
 336         echo '.global __ttf_$(*F)_begin';               \
 337         echo '__ttf_$(*F)_begin:';                      \
 338         echo '.incbin "$<" ';                           \
 339         echo '__ttf_$(*F)_end:';                        \
 340         echo '.global __ttf_$(*F)_end';                 \
 341         echo '.balign 16';                              \
 342 ) > $@
 343
 344 $(obj)/%.S: $(src)/%.ttf
 345         $(call cmd,S_ttf)
 346
 347 # EFI Hello World application
 348 # ---------------------------------------------------------------------------
 349
 350 # Generate an assembly file to wrap the EFI app
 351 cmd_S_efi=                                              \
 352 (                                                       \
 353         echo '.section .rodata.efi.init,"a"';           \
 354         echo '.balign 16';                              \
 355         echo '.global __efi_hello_world_begin';         \
 356         echo '__efi_hello_world_begin:';                \
 357         echo '.incbin "$<" ';                           \
 358         echo '__efi_hello_world_end:';                  \
 359         echo '.global __efi_hello_world_end';           \
 360         echo '.balign 16';                              \
 361 ) > $@
 362
 363 $(obj)/%_efi.S: $(obj)/%.efi
 364         $(call cmd,S_efi)
 365
 366 $(obj)/%.efi: $(obj)/%.so
 367         $(OBJCOPY) -j .header -j .text -j .sdata -j .data -j .dynamic \
 368                 -j .dynsym  -j .rel* -j .rela* -j .reloc \
 369                 $(if $(EFI_TARGET),$(EFI_TARGET),-O binary) $^ $@
 370
 371 EFI_LDS_PATH = $(srctree)/arch/$(ARCH)/lib/$(EFI_LDS)
 372
 373 $(obj)/helloworld.so: $(EFI_LDS_PATH)
 374
 375 $(obj)/helloworld.so: $(obj)/helloworld.o arch/$(ARCH)/lib/$(EFI_CRT0) \
 376                 arch/$(ARCH)/lib/$(EFI_RELOC)
 377         $(LD) -nostdlib -znocombreloc -T $(EFI_LDS_PATH) -shared -Bsymbolic \
 378                 $^ -o $@
 379
 380 # ACPI
 381 # ---------------------------------------------------------------------------
 382 quiet_cmd_acpi_c_asl= ASL     $<
 383 cmd_acpi_c_asl=         \
 384         $(CPP) -x assembler-with-cpp -D__ASSEMBLY__ -P $(UBOOTINCLUDE) -o $<.tmp $<; \
 385         iasl -p $< -tc $<.tmp $(if $(KBUILD_VERBOSE:1=), >/dev/null); \
 386         mv $(patsubst %.asl,%.hex,$<) $@
 387
 388 $(obj)/dsdt.c:    $(src)/dsdt.asl
 389         $(call cmd,acpi_c_asl)
 390
 391 # Bzip2
 392 # ---------------------------------------------------------------------------
 393
 394 # Bzip2 and LZMA do not include size in file... so we have to fake that;
 395 # append the size as a 32-bit littleendian number as gzip does.
 396 size_append = printf $(shell                                            \
 397 dec_size=0;                                                             \
 398 for F in $1; do                                                         \
 399         fsize=$$(stat -c "%s" $$F);                                     \
 400         dec_size=$$(expr $$dec_size + $$fsize);                         \
 401 done;                                                                   \
 402 printf "%08x\n" $$dec_size |                                            \
 403         sed 's/\(..\)/\1 /g' | {                                        \
 404                 read ch0 ch1 ch2 ch3;                                   \
 405                 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do                   \
 406                         printf '%s%03o' '\\' $$((0x$$ch));              \
 407                 done;                                                   \
 408         }                                                               \
 409 )
 410
 411 quiet_cmd_bzip2 = BZIP2   $@
 412 cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
 413         bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 414         (rm -f $@ ; false)
 415
 416 # Lzma
 417 # ---------------------------------------------------------------------------
 418
 419 quiet_cmd_lzma = LZMA    $@
 420 cmd_lzma = (cat $(filter-out FORCE,$^) | \
 421         lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 422         (rm -f $@ ; false)
 423
 424 quiet_cmd_lzo = LZO     $@
 425 cmd_lzo = (cat $(filter-out FORCE,$^) | \
 426         lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 427         (rm -f $@ ; false)
 428
 429 quiet_cmd_lz4 = LZ4     $@
 430 cmd_lz4 = (cat $(filter-out FORCE,$^) | \
 431         lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 432         (rm -f $@ ; false)
 433
 434 # U-Boot mkimage
 435 # ---------------------------------------------------------------------------
 436
 437 MKIMAGE := $(srctree)/scripts/mkuboot.sh
 438
 439 # SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
 440 # the number of overrides in arch makefiles
 441 UIMAGE_ARCH ?= $(SRCARCH)
 442 UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
 443 UIMAGE_OPTS-y ?=
 444 UIMAGE_TYPE ?= kernel
 445 UIMAGE_LOADADDR ?= arch_must_set_this
 446 UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
 447 UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
 448 UIMAGE_IN ?= $<
 449 UIMAGE_OUT ?= $@
 450
 451 quiet_cmd_uimage = UIMAGE  $(UIMAGE_OUT)
 452       cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
 453                         -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
 454                         -T $(UIMAGE_TYPE) \
 455                         -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
 456                         -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
 457
 458 # XZ
 459 # ---------------------------------------------------------------------------
 460 # Use xzkern to compress the kernel image and xzmisc to compress other things.
 461 #
 462 # xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
 463 # of the kernel decompressor. A BCJ filter is used if it is available for
 464 # the target architecture. xzkern also appends uncompressed size of the data
 465 # using size_append. The .xz format has the size information available at
 466 # the end of the file too, but it's in more complex format and it's good to
 467 # avoid changing the part of the boot code that reads the uncompressed size.
 468 # Note that the bytes added by size_append will make the xz tool think that
 469 # the file is corrupt. This is expected.
 470 #
 471 # xzmisc doesn't use size_append, so it can be used to create normal .xz
 472 # files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
 473 # big dictionary would increase the memory usage too much in the multi-call
 474 # decompression mode. A BCJ filter isn't used either.
 475 quiet_cmd_xzkern = XZKERN  $@
 476 cmd_xzkern = (cat $(filter-out FORCE,$^) | \
 477         sh $(srctree)/scripts/xz_wrap.sh && \
 478         $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 479         (rm -f $@ ; false)
 480
 481 quiet_cmd_xzmisc = XZMISC  $@
 482 cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
 483         xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
 484         (rm -f $@ ; false)
 485
 486 # Additional commands for U-Boot
 487 #
 488 # mkimage
 489 # ---------------------------------------------------------------------------
 490 MKIMAGEOUTPUT ?= /dev/null
 491 quiet_cmd_mkimage = MKIMAGE $@
 492 cmd_mkimage = $(objtree)/tools/mkimage $(MKIMAGEFLAGS_$(@F)) -d $< $@ \
 493         $(if $(KBUILD_VERBOSE:1=), >$(MKIMAGEOUTPUT))