# SPDX-License-Identifier: GPL-2.0
# Backward compatibility
asflags-y  += $(EXTRA_AFLAGS)
ccflags-y  += $(EXTRA_CFLAGS)
cppflags-y += $(EXTRA_CPPFLAGS)
ldflags-y  += $(EXTRA_LDFLAGS)

# flags that take effect in current and sub directories
KBUILD_AFLAGS += $(subdir-asflags-y)
KBUILD_CFLAGS += $(subdir-ccflags-y)

# Figure out what we need to build from the various variables
# ===========================================================================

# When an object is listed to be built compiled-in and modular,
# only build the compiled-in version
obj-m := $(filter-out $(obj-y),$(obj-m))

# Libraries are always collected in one lib file.
# Filter out objects already built-in
lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))

# Subdirectories we need to descend into
subdir-ym := $(sort $(subdir-y) $(subdir-m) \
			$(patsubst %/,%, $(filter %/, $(obj-y) $(obj-m))))

# Handle objects in subdirs:
# - If we encounter foo/ in $(obj-y), replace it by foo/built-in.a and
#   foo/modules.order
# - If we encounter foo/ in $(obj-m), replace it by foo/modules.order
#
# Generate modules.order to determine modorder. Unfortunately, we don't have
# information about ordering between -y and -m subdirs. Just put -y's first.

ifdef need-modorder
obj-m := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m))
else
obj-m := $(filter-out %/, $(obj-m))
endif

ifdef need-builtin
obj-y		:= $(patsubst %/, %/built-in.a, $(obj-y))
else
obj-y		:= $(filter-out %/, $(obj-y))
endif

# Expand $(foo-objs) $(foo-y) etc. by replacing their individuals
suffix-search = $(strip $(foreach s, $3, $($(1:%$(strip $2)=%$s))))
# List composite targets that are constructed by combining other targets
multi-search = $(sort $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $m)))
# List primitive targets that are compiled from source files
real-search = $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $(call suffix-search, $m, $2, $3), $m))

# If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object
multi-obj-y := $(call multi-search, $(obj-y), .o, -objs -y)
multi-obj-m := $(call multi-search, $(obj-m), .o, -objs -y -m)
multi-obj-ym := $(multi-obj-y) $(multi-obj-m)

# Replace multi-part objects by their individual parts,
# including built-in.a from subdirectories
real-obj-y := $(call real-search, $(obj-y), .o, -objs -y)
real-obj-m := $(call real-search, $(obj-m), .o, -objs -y -m)

always-y += $(always-m)

# hostprogs-always-y += foo
# ... is a shorthand for
# hostprogs += foo
# always-y  += foo
hostprogs += $(hostprogs-always-y) $(hostprogs-always-m)
always-y += $(hostprogs-always-y) $(hostprogs-always-m)

# userprogs-always-y is likewise.
userprogs += $(userprogs-always-y) $(userprogs-always-m)
always-y += $(userprogs-always-y) $(userprogs-always-m)

# Composite DTB (i.e. DTB constructed by overlay)
multi-dtb-y := $(call multi-search, $(dtb-y), .dtb, -dtbs)
# Primitive DTB compiled from *.dts
real-dtb-y := $(call real-search, $(dtb-y), .dtb, -dtbs)
# Base DTB that overlay is applied onto (each first word of $(*-dtbs) expansion)
base-dtb-y := $(foreach m, $(multi-dtb-y), $(firstword $(call suffix-search, $m, .dtb, -dtbs)))

# DTB
# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
extra-y				+= $(dtb-y)
extra-$(CONFIG_OF_ALL_DTBS)	+= $(dtb-)

# Add subdir path

extra-y		:= $(addprefix $(obj)/,$(extra-y))
always-y	:= $(addprefix $(obj)/,$(always-y))
targets		:= $(addprefix $(obj)/,$(targets))
obj-m		:= $(addprefix $(obj)/,$(obj-m))
lib-y		:= $(addprefix $(obj)/,$(lib-y))
real-obj-y	:= $(addprefix $(obj)/,$(real-obj-y))
real-obj-m	:= $(addprefix $(obj)/,$(real-obj-m))
multi-obj-m	:= $(addprefix $(obj)/, $(multi-obj-m))
multi-dtb-y	:= $(addprefix $(obj)/, $(multi-dtb-y))
real-dtb-y	:= $(addprefix $(obj)/, $(real-dtb-y))
subdir-ym	:= $(addprefix $(obj)/,$(subdir-ym))

# Finds the multi-part object the current object will be linked into.
# If the object belongs to two or more multi-part objects, list them all.
modname-multi = $(sort $(foreach m,$(multi-obj-ym),\
		$(if $(filter $*.o, $(call suffix-search, $m, .o, -objs -y -m)),$(m:.o=))))

__modname = $(or $(modname-multi),$(basetarget))

modname = $(subst $(space),:,$(__modname))
modfile = $(addprefix $(obj)/,$(__modname))

# target with $(obj)/ and its suffix stripped
target-stem = $(basename $(patsubst $(obj)/%,%,$@))

# These flags are needed for modversions and compiling, so we define them here
# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
# end up in (or would, if it gets compiled in)
name-fix-token = $(subst $(comma),_,$(subst -,_,$1))
name-fix = $(call stringify,$(call name-fix-token,$1))
basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
modname_flags  = -DKBUILD_MODNAME=$(call name-fix,$(modname)) \
		 -D__KBUILD_MODNAME=kmod_$(call name-fix-token,$(modname))
modfile_flags  = -DKBUILD_MODFILE=$(call stringify,$(modfile))

_c_flags       = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), \
                     $(filter-out $(ccflags-remove-y), \
                         $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(ccflags-y)) \
                     $(CFLAGS_$(target-stem).o))
_a_flags       = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), \
                     $(filter-out $(asflags-remove-y), \
                         $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(asflags-y)) \
                     $(AFLAGS_$(target-stem).o))
_cpp_flags     = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds)

#
# Enable gcov profiling flags for a file, directory or for all files depending
# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
# (in this order)
#
ifeq ($(CONFIG_GCOV_KERNEL),y)
_c_flags += $(if $(patsubst n%,, \
		$(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
		$(CFLAGS_GCOV))
endif

#
# Enable address sanitizer flags for kernel except some files or directories
# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
#
ifeq ($(CONFIG_KASAN),y)
ifneq ($(CONFIG_KASAN_HW_TAGS),y)
_c_flags += $(if $(patsubst n%,, \
		$(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
		$(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
endif
endif

ifeq ($(CONFIG_UBSAN),y)
_c_flags += $(if $(patsubst n%,, \
		$(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
		$(CFLAGS_UBSAN))
endif

ifeq ($(CONFIG_KCOV),y)
_c_flags += $(if $(patsubst n%,, \
	$(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
	$(CFLAGS_KCOV))
endif

#
# Enable KCSAN flags except some files or directories we don't want to check
# (depends on variables KCSAN_SANITIZE_obj.o, KCSAN_SANITIZE)
#
ifeq ($(CONFIG_KCSAN),y)
_c_flags += $(if $(patsubst n%,, \
	$(KCSAN_SANITIZE_$(basetarget).o)$(KCSAN_SANITIZE)y), \
	$(CFLAGS_KCSAN))
# Some uninstrumented files provide implied barriers required to avoid false
# positives: set KCSAN_INSTRUMENT_BARRIERS for barrier instrumentation only.
_c_flags += $(if $(patsubst n%,, \
	$(KCSAN_INSTRUMENT_BARRIERS_$(basetarget).o)$(KCSAN_INSTRUMENT_BARRIERS)n), \
	-D__KCSAN_INSTRUMENT_BARRIERS__)
endif

# $(srctree)/$(src) for including checkin headers from generated source files
# $(objtree)/$(obj) for including generated headers from checkin source files
ifeq ($(KBUILD_EXTMOD),)
ifdef building_out_of_srctree
_c_flags   += -I $(srctree)/$(src) -I $(objtree)/$(obj)
_a_flags   += -I $(srctree)/$(src) -I $(objtree)/$(obj)
_cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
endif
endif

part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)
quiet_modtag = $(if $(part-of-module),[M],   )

modkern_cflags =                                          \
	$(if $(part-of-module),                           \
		$(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
		$(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL) $(modfile_flags))

modkern_aflags = $(if $(part-of-module),				\
			$(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE),	\
			$(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL))


# Modified for U-Boot: LINUXINCLUDE -> UBOOTINCLUDE
# removed the inclusion of compiler_types.h for sandbox build
c_flags        = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(UBOOTINCLUDE)    \
		 $(_c_flags) $(modkern_cflags)                           \
		 $(basename_flags) $(modname_flags)

a_flags        = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(UBOOTINCLUDE)     \
		 $(_a_flags) $(modkern_aflags)

cpp_flags      = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(UBOOTINCLUDE)     \
		 $(_cpp_flags)

ld_flags       = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F))

# Try these files in order to find the U-Boot-specific .dtsi include file
u_boot_dtsi_loc = $(srctree)/arch/$(ARCH)/dts/

u_boot_dtsi_options = $(strip $(wildcard $(u_boot_dtsi_loc)$(basename $(notdir $<))-u-boot.dtsi) \
	$(wildcard $(u_boot_dtsi_loc)$(subst $\",,$(CONFIG_SYS_SOC))-u-boot.dtsi) \
	$(wildcard $(u_boot_dtsi_loc)$(subst $\",,$(CONFIG_SYS_CPU))-u-boot.dtsi) \
	$(wildcard $(u_boot_dtsi_loc)$(subst $\",,$(CONFIG_SYS_VENDOR))-u-boot.dtsi) \
	$(wildcard $(u_boot_dtsi_loc)u-boot.dtsi))

u_boot_dtsi_options_raw = $(warning Automatic .dtsi inclusion: options: \
	$(u_boot_dtsi_loc)$(basename $(notdir $<))-u-boot.dtsi \
	$(u_boot_dtsi_loc)$(subst $\",,$(CONFIG_SYS_SOC))-u-boot.dtsi \
	$(u_boot_dtsi_loc)$(subst $\",,$(CONFIG_SYS_CPU))-u-boot.dtsi \
	$(u_boot_dtsi_loc)$(subst $\",,$(CONFIG_SYS_VENDOR))-u-boot.dtsi \
	$(u_boot_dtsi_loc)u-boot.dtsi ... \
	found: $(if $(u_boot_dtsi_options),"$(u_boot_dtsi_options)",nothing!))

# Uncomment for debugging
# This shows all the files that were considered and the one that we chose.
ifdef DEVICE_TREE_DEBUG
u_boot_dtsi_options_debug = $(warning $(u_boot_dtsi_options_raw))
endif

# We use the first match to be included
dtsi_include_list = $(strip $(u_boot_dtsi_options_debug) \
	$(notdir $(firstword $(u_boot_dtsi_options))))

# Modified for U-Boot
upstream_dtsi_include = $(addprefix -I, $(srctree)/dts/upstream/src/ \
	$(sort $(dir $(wildcard $(srctree)/dts/upstream/src/$(ARCH)/*/*))) \
	$(sort $(dir $(wildcard $(srctree)/dts/upstream/src/$(ARCH)/*/*/*))) \
	$(if (CONFIG_ARM64), \
		 $(sort $(dir $(wildcard $(srctree)/dts/upstream/src/arm64/*/*))) \
		 $(sort $(dir $(wildcard $(srctree)/dts/upstream/src/arm64/*/*/*)))))
dtc_cpp_flags  = -Wp,-MD,$(depfile).pre.tmp -nostdinc                    \
		 $(UBOOTINCLUDE)                                         \
		 -I$(dir $<)                                             \
		 -I$(u_boot_dtsi_loc)                                     \
		 -I$(srctree)/arch/$(ARCH)/dts/include                   \
		 -I$(srctree)/include                                    \
		 $(upstream_dtsi_include)                                \
		 -D__ASSEMBLY__                                          \
		 -undef -D__DTS__

ifdef CONFIG_OBJTOOL

objtool := $(objtree)/tools/objtool/objtool

objtool_args =								\
	$(if $(CONFIG_HAVE_JUMP_LABEL_HACK), --hacks=jump_label)	\
	$(if $(CONFIG_HAVE_NOINSTR_HACK), --hacks=noinstr)		\
	$(if $(CONFIG_X86_KERNEL_IBT), --ibt)				\
	$(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount)		\
	$(if $(CONFIG_UNWINDER_ORC), --orc)				\
	$(if $(CONFIG_RETPOLINE), --retpoline)				\
	$(if $(CONFIG_RETHUNK), --rethunk)				\
	$(if $(CONFIG_SLS), --sls)					\
	$(if $(CONFIG_STACK_VALIDATION), --stackval)			\
	$(if $(CONFIG_HAVE_STATIC_CALL_INLINE), --static-call)		\
	$(if $(CONFIG_HAVE_UACCESS_VALIDATION), --uaccess)		\
	$(if $(delay-objtool), --link)					\
	$(if $(part-of-module), --module)				\
	$(if $(CONFIG_GCOV_KERNEL), --no-unreachable)

delay-objtool := $(or $(CONFIG_LTO_CLANG),$(CONFIG_X86_KERNEL_IBT))

cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool_args) $@)
cmd_gen_objtooldep = $(if $(objtool-enabled), { echo ; echo '$@: $$(wildcard $(objtool))' ; } >> $(dot-target).cmd)

endif # CONFIG_OBJTOOL

# Useful for describing the dependency of composite objects
# Usage:
#   $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
define multi_depend
$(foreach m, $1, \
	$(eval $m: \
	$(addprefix $(obj)/, $(call suffix-search, $(patsubst $(obj)/%,%,$m), $2, $3))))
endef

# Copy a file
# ===========================================================================
# 'cp' preserves permissions. If you use it to copy a file in read-only srctree,
# the copy would be read-only as well, leading to an error when executing the
# rule next time. Use 'cat' instead in order to generate a writable file.
quiet_cmd_copy = COPY    $@
      cmd_copy = cat $< > $@

$(obj)/%: $(src)/%_shipped
	$(call cmd,copy)

# Commands useful for building a boot image
# ===========================================================================
#
#	Use as following:
#
#	target: source(s) FORCE
#		$(if_changed,ld/objcopy/gzip)
#
#	and add target to 'targets' so that we know we have to
#	read in the saved command line

# Linking
# ---------------------------------------------------------------------------

quiet_cmd_ld = LD      $@
      cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@

# Archive
# ---------------------------------------------------------------------------

quiet_cmd_ar = AR      $@
      cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs)

# Objcopy
# ---------------------------------------------------------------------------

quiet_cmd_objcopy = OBJCOPY $@
cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@

# Gzip
# ---------------------------------------------------------------------------

quiet_cmd_gzip = GZIP    $@
      cmd_gzip = cat $(real-prereqs) | $(KGZIP) -n -f -9 > $@

# DTC
# ---------------------------------------------------------------------------
DTC ?= $(objtree)/scripts/dtc/dtc
DTC_FLAGS += -Wno-interrupt_provider

# Disable noisy checks by default
ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
DTC_FLAGS += -Wno-unit_address_vs_reg \
	-Wno-unit_address_format \
	-Wno-avoid_unnecessary_addr_size \
	-Wno-alias_paths \
	-Wno-graph_child_address \
	-Wno-simple_bus_reg \
	-Wno-unique_unit_address \
	-Wno-pci_device_reg

# U-Boot specific disables
DTC_FLAGS += -Wno-pci_bridge \
        -Wno-pci_device_bus_num
endif

ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),)
DTC_FLAGS += -Wnode_name_chars_strict \
	-Wproperty_name_chars_strict \
	-Winterrupt_provider
endif

DTC_FLAGS += $(DTC_FLAGS_$(basetarget))

# Set -@ if the target is a base DTB that overlay is applied onto
DTC_FLAGS += $(if $(filter $(patsubst $(obj)/%,%,$@), $(base-dtb-y)), -@)

# Generate an assembly file to wrap the output of the device tree compiler
quiet_cmd_dt_S_dtb= DTBS    $@
# Modified for U-Boot
cmd_dt_S_dtb=						\
{							\
	echo '.section .dtb.init.rodata,"a"';		\
	echo '.balign 16';				\
	echo '.global __dtb_$(subst -,_,$(*F))_begin';	\
	echo '__dtb_$(subst -,_,$(*F))_begin:';		\
	echo '.incbin "$<" ';				\
	echo '__dtb_$(subst -,_,$(*F))_end:';		\
	echo '.global __dtb_$(subst -,_,$(*F))_end';	\
	echo '.balign 16';				\
} > $@

$(obj)/%.dtb.S: $(obj)/%.dtb FORCE
	$(call if_changed,dt_S_dtb)

# Generate an assembly file to wrap the output of the device tree compiler
quiet_cmd_dt_S_dtbo= DTBOS   $@
# Modified for U-Boot
cmd_dt_S_dtbo=						\
{							\
	echo '.section .dtb.init.rodata,"a"';		\
	echo '.balign 16';				\
	echo '.global __dtbo_$(subst -,_,$(*F))_begin';	\
	echo '__dtbo_$(subst -,_,$(*F))_begin:';	\
	echo '.incbin "$<" ';				\
	echo '__dtbo_$(subst -,_,$(*F))_end:';		\
	echo '.global __dtbo_$(subst -,_,$(*F))_end';	\
	echo '.balign 16';				\
} > $@

$(obj)/%.dtbo.S: $(obj)/%.dtbo
	$(call cmd,dt_S_dtbo)

ifeq ($(CONFIG_OF_LIBFDT_OVERLAY),y)
DTC_FLAGS += -@
endif

# In case DEVICE_TREE_DEBUG is set, produce a diff between the base DT and
# DT with U-Boot extras, to show how much does the U-Boot DT differ from
# the base DT. This is particularly useful together with OF_UPSTREAM, to
# minimize the diff between upstream DTs and U-Boot DTs.
ifdef DEVICE_TREE_DEBUG
cmd_dtc_diff = \
	$(HOSTCC) -E $(dtc_cpp_flags) -I$(obj) -x assembler-with-cpp -o $(dtn-tmp) $< ; \
	$(DTC) -s -O dts -o $@.clean.dts -b 0 \
		-i $(dir $<) $(DTC_FLAGS) $(dtn-tmp) || \
		(echo "Check $(shell pwd)/$< for errors" && false); \
	$(DTC) -s -O dts -o $@.full.dts -b 0 \
		-i $(dir $<) -i $(u_boot_dtsi_loc) $(DTC_FLAGS) $(dtc-tmp) || \
		(echo "Check $(shell pwd)/$(pre-tmp) for errors" && false); \
	sed -i '/\<phandle\> = <0x[0-9a-f]\+>;/ d' $@.clean.dts; \
	sed -i '/\<phandle\> = <0x[0-9a-f]\+>;/ d' $@.full.dts; \
	(diff -Naru $@.clean.dts $@.full.dts > $@.diff || true)

dtn-tmp = $(subst $(comma),_,$(dot-target).dtn.tmp)
else
cmd_dtc_diff = true
endif

quiet_cmd_dtc = DTC     $@
# Modified for U-Boot
# Bring in any U-Boot-specific include at the end of the file
# And finally any custom .dtsi fragments specified with CONFIG_DEVICE_TREE_INCLUDES
cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
	(cat $< > $(pre-tmp)); \
	$(foreach f,$(subst $(quote),,$(dtsi_include_list) $(CONFIG_DEVICE_TREE_INCLUDES)), \
	  echo '$(pound)include "$(f)"' >> $(pre-tmp);) \
	$(HOSTCC) -E $(dtc_cpp_flags) -I$(obj) -x assembler-with-cpp -o $(dtc-tmp) $(pre-tmp) ; \
	$(DTC) -O dtb -o $@ -b 0 \
		-i $(dir $<) -i $(u_boot_dtsi_loc) $(DTC_FLAGS) \
		-d $(depfile).dtc.tmp $(dtc-tmp) || \
		(echo "Check $(shell pwd)/$(pre-tmp) for errors" && false) \
		; \
	sed "s:$(pre-tmp):$(<):" $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile) ; \
	$(cmd_dtc_diff)

dtsi_include_list_deps := $(addprefix $(u_boot_dtsi_loc),$(subst $(quote),,$(dtsi_include_list)))

ifneq ($(CHECK_DTBS),)
DT_CHECKER ?= dt-validate
DT_CHECKER_FLAGS ?= $(if $(DT_SCHEMA_FILES),-l $(DT_SCHEMA_FILES),-m)
DT_BINDING_DIR := dts/upstream/Bindings
DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.json

quiet_cmd_dtb = DTC_CHK $@
      cmd_dtb = $(cmd_dtc) ; $(DT_CHECKER) $(DT_CHECKER_FLAGS) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ || true
else
quiet_cmd_dtb = $(quiet_cmd_dtc)
      cmd_dtb = $(cmd_dtc)
endif

$(obj)/%.dtb: $(src)/%.dts $(DTC) $(dtsi_include_list_deps) $(DT_TMP_SCHEMA) FORCE
	$(call if_changed_dep,dtb)

pre-tmp = $(subst $(comma),_,$(dot-target).pre.tmp)
dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)

# DTCO
# ---------------------------------------------------------------------------

quiet_cmd_dtco = DTCO    $@
# Rule for objects only; does not put specific u-boot include at the end
# No generation of assembly file either
# Modified for U-Boot
cmd_dtco = mkdir -p $(dir ${dtc-tmp}) ; \
	$(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
	$(DTC) -@ -O dtb -o $@ -b 0 \
		-i $(dir $<) $(DTC_FLAGS) \
		-d $(depfile).dtc.tmp $(dtc-tmp) ; \
	cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)

$(obj)/%.dtbo: $(src)/%.dtso $(DTC) FORCE
	$(call if_changed_dep,dtco)

quiet_cmd_fdtoverlay = DTOVL   $@
           cmd_fdtoverlay = fdtoverlay -o $@ -i $(real-prereqs)

$(multi-dtb-y): FORCE
	$(call if_changed,fdtoverlay)
$(call multi_depend, $(multi-dtb-y), .dtb, -dtbs)

# ACPI
# ---------------------------------------------------------------------------
#
# This first sends the file (typically dsdt.asl) through the preprocessor
# resolve includes and any CONFIG options used. This produces dsdt.asl.tmp
# which is pure ASL code. The Intel ASL (ACPI (Advanced Configuration and Power
# Interface) Source Language compiler (iasl) then converts this ASL code into a
# C file containing the hex data to build into U-Boot. This file is called
# dsdt_generated.hex (despite us setting the prefix to .../dsdt_generated.asl.tmp)
# so must be renamed to dsdt_generated.c for consumption by the build system.
ASL_TMP = $(patsubst %.c,%.asl.tmp,$@)

quiet_cmd_acpi_c_asl= ASL     $<
cmd_acpi_c_asl=         \
	$(CPP) -x assembler-with-cpp -D__ASSEMBLY__ -D__ACPI__ \
		-P $(UBOOTINCLUDE) -o $(ASL_TMP) $< && \
	iasl -p $@ -I $(srctree)/board/$(BOARDDIR) -tc $(ASL_TMP) \
		$(if $(KBUILD_VERBOSE:1=), >/dev/null) && \
	mv $(patsubst %.c,%.hex,$@) $@

$(obj)/dsdt_generated.c:    $(src)/dsdt.asl
	$(call cmd,acpi_c_asl)
	$(Q)sed -i -e "s,dsdt_generated_aml_code,AmlCode," $@

# Bzip2
# ---------------------------------------------------------------------------

# Bzip2 and LZMA do not include size in file... so we have to fake that;
# append the size as a 32-bit littleendian number as gzip does.
size_append = printf $(shell						\
dec_size=0;								\
for F in $(real-prereqs); do					\
	fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F);	\
	dec_size=$$(expr $$dec_size + $$fsize);				\
done;									\
printf "%08x\n" $$dec_size |						\
	sed 's/\(..\)/\1 /g' | {					\
		read ch0 ch1 ch2 ch3;					\
		for ch in $$ch3 $$ch2 $$ch1 $$ch0; do			\
			printf '%s%03o' '\\' $$((0x$$ch)); 		\
		done;							\
	}								\
)

quiet_cmd_file_size = GEN     $@
      cmd_file_size = $(size_append) > $@

quiet_cmd_bzip2 = BZIP2   $@
      cmd_bzip2 = cat $(real-prereqs) | $(KBZIP2) -9 > $@

quiet_cmd_bzip2_with_size = BZIP2   $@
      cmd_bzip2_with_size = { cat $(real-prereqs) | $(KBZIP2) -9; $(size_append); } > $@

# Lzma
# ---------------------------------------------------------------------------

quiet_cmd_lzma = LZMA    $@
      cmd_lzma = cat $(real-prereqs) | $(LZMA) -9 > $@

quiet_cmd_lzma_with_size = LZMA    $@
      cmd_lzma_with_size = { cat $(real-prereqs) | $(LZMA) -9; $(size_append); } > $@

quiet_cmd_lzo = LZO     $@
      cmd_lzo = cat $(real-prereqs) | $(KLZOP) -9 > $@

quiet_cmd_lzo_with_size = LZO     $@
      cmd_lzo_with_size = { cat $(real-prereqs) | $(KLZOP) -9; $(size_append); } > $@

quiet_cmd_lz4 = LZ4     $@
      cmd_lz4 = cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout > $@

quiet_cmd_lz4_with_size = LZ4     $@
      cmd_lz4_with_size = { cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout; \
                  $(size_append); } > $@

# U-Boot mkimage
# ---------------------------------------------------------------------------

MKIMAGE := $(srctree)/scripts/mkuboot.sh

# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
# the number of overrides in arch makefiles
UIMAGE_ARCH ?= $(SRCARCH)
UIMAGE_COMPRESSION ?= $(or $(2),none)
UIMAGE_OPTS-y ?=
UIMAGE_TYPE ?= kernel
UIMAGE_LOADADDR ?= arch_must_set_this
UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'

quiet_cmd_uimage = UIMAGE  $@
      cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
			-C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
			-T $(UIMAGE_TYPE) \
			-a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
			-n $(UIMAGE_NAME) -d $< $@

# XZ
# ---------------------------------------------------------------------------
# Use xzkern to compress the kernel image and xzmisc to compress other things.
#
# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
# of the kernel decompressor. A BCJ filter is used if it is available for
# the target architecture. xzkern also appends uncompressed size of the data
# using size_append. The .xz format has the size information available at
# the end of the file too, but it's in more complex format and it's good to
# avoid changing the part of the boot code that reads the uncompressed size.
# Note that the bytes added by size_append will make the xz tool think that
# the file is corrupt. This is expected.
#
# xzmisc doesn't use size_append, so it can be used to create normal .xz
# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
# big dictionary would increase the memory usage too much in the multi-call
# decompression mode. A BCJ filter isn't used either.
quiet_cmd_xzkern = XZKERN  $@
      cmd_xzkern = cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh > $@

quiet_cmd_xzkern_with_size = XZKERN  $@
      cmd_xzkern_with_size = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \
                     $(size_append); } > $@

quiet_cmd_xzmisc = XZMISC  $@
      cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@

# ZSTD
# ---------------------------------------------------------------------------
# Appends the uncompressed size of the data using size_append. The .zst
# format has the size information available at the beginning of the file too,
# but it's in a more complex format and it's good to avoid changing the part
# of the boot code that reads the uncompressed size.
#
# Note that the bytes added by size_append will make the zstd tool think that
# the file is corrupt. This is expected.
#
# zstd uses a maximum window size of 8 MB. zstd22 uses a maximum window size of
# 128 MB. zstd22 is used for kernel compression because it is decompressed in a
# single pass, so zstd doesn't need to allocate a window buffer. When streaming
# decompression is used, like initramfs decompression, zstd22 should likely not
# be used because it would require zstd to allocate a 128 MB buffer.

quiet_cmd_zstd = ZSTD    $@
      cmd_zstd = cat $(real-prereqs) | $(ZSTD) -19 > $@

quiet_cmd_zstd22 = ZSTD22  $@
      cmd_zstd22 = cat $(real-prereqs) | $(ZSTD) -22 --ultra > $@

quiet_cmd_zstd22_with_size = ZSTD22  $@
      cmd_zstd22_with_size = { cat $(real-prereqs) | $(ZSTD) -22 --ultra; $(size_append); } > $@

# Additional commands for U-Boot
#
# bin2c
# ---------------------------------------------------------------------------
quiet_cmd_bin2c = BIN2C   $@
      cmd_bin2c = $(objtree)/scripts/bin2c $2 < $< > $@

# mkimage
# ---------------------------------------------------------------------------
MKIMAGEOUTPUT ?= /dev/null
quiet_cmd_mkimage = MKIMAGE $@
cmd_mkimage = $(objtree)/tools/mkimage $(MKIMAGEFLAGS_$(@F)) -d $< $@ \
	>$(MKIMAGEOUTPUT) $(if $(KBUILD_VERBOSE:0=), && cat $(MKIMAGEOUTPUT))

# fdtgrep
# ---------------------------------------------------------------------------
# Pass the original device tree file through fdtgrep twice. The first pass
# removes any unwanted nodes (i.e. those which don't have the
# 'bootph-all' property and thus are not needed by SPL. The second
# pass removes various unused properties from the remaining nodes.
# The output is typically a much smaller device tree file.

ifeq ($(CONFIG_VPL_BUILD),y)
fdtgrep_props := -b bootph-all -b bootph-verify $(migrate_vpl)
else
ifeq ($(CONFIG_TPL_BUILD),y)
fdtgrep_props := -b bootph-all -b bootph-pre-sram $(migrate_tpl)
else
fdtgrep_props := -b bootph-all -b bootph-pre-ram $(migrate_spl)
endif
endif

# This rule produces the .dtb for an SPL build.
#
# The first fdtgrep keeps nodes with the above properties (with -u ensuring that
# the properties are implied in all parents of a matching node). The root node
# is always included, along with /chosen and /config nodes. Referenced aliases
# (i.e. properties in /aliases which point to an incldued node) are also
# included.
#
# The second fdtgrep removes all bootph properties along with unused strings
# and any properties in CONFIG_OF_SPL_REMOVE_PROPS
quiet_cmd_fdtgrep = FDTGREP $@
      cmd_fdtgrep = $(objtree)/tools/fdtgrep $(fdtgrep_props) -u -RT $< \
		-n /chosen -n /config -O dtb | \
	$(objtree)/tools/fdtgrep -r -O dtb - -o $@ \
		-P bootph-all -P bootph-pre-ram -P bootph-pre-sram \
		-P bootph-verify -P bootph-some-ram \
		$(migrate_all) \
		$(addprefix -P ,$(subst $\",,$(CONFIG_OF_SPL_REMOVE_PROPS)))

# fdt_rm_props
# ---------------------------------------------------------------------------
# Pass the original device tree file through fdtgrep. This removes various
# unused properties. The output is typically a smaller device tree file.
quiet_cmd_fdt_rm_props = FDTGREP $@
	cmd_fdt_rm_props = cat $< | $(objtree)/tools/fdtgrep -r -O dtb - -o $@ \
			$(addprefix -P ,$(subst $\",,$(CONFIG_OF_REMOVE_PROPS)))

# ASM offsets
# ---------------------------------------------------------------------------

# Default sed regexp - multiline due to syntax constraints
#
# Use [:space:] because LLVM's integrated assembler inserts <tab> around
# the .ascii directive whereas GCC keeps the <space> as-is.
define sed-offsets
	's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
	/^->/{s:->#\(.*\):/* \1 */:; \
	s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
	s:->::; p;}'
endef

# Use filechk to avoid rebuilds when a header changes, but the resulting file
# does not
define filechk_offsets
	 echo "#ifndef $2"; \
	 echo "#define $2"; \
	 echo "/*"; \
	 echo " * DO NOT MODIFY."; \
	 echo " *"; \
	 echo " * This file was generated by Kbuild"; \
	 echo " */"; \
	 echo ""; \
	 sed -ne $(sed-offsets) < $<; \
	 echo ""; \
	 echo "#endif"
endef