[linux-block.git] / arch / x86 / Makefile

# SPDX-License-Identifier: GPL-2.0
# Unified Makefile for i386 and x86_64

# select defconfig based on actual architecture
ifeq ($(ARCH),x86)
  ifeq ($(shell uname -m),x86_64)
        KBUILD_DEFCONFIG := x86_64_defconfig
  else
        KBUILD_DEFCONFIG := i386_defconfig
  endif
else
        KBUILD_DEFCONFIG := $(ARCH)_defconfig
endif

# For gcc stack alignment is specified with -mpreferred-stack-boundary,
# clang has the option -mstack-alignment for that purpose.
ifneq ($(call cc-option, -mpreferred-stack-boundary=4),)
      cc_stack_align4 := -mpreferred-stack-boundary=2
      cc_stack_align8 := -mpreferred-stack-boundary=3
else ifneq ($(call cc-option, -mstack-alignment=16),)
      cc_stack_align4 := -mstack-alignment=4
      cc_stack_align8 := -mstack-alignment=8
endif

# How to compile the 16-bit code.  Note we always compile for -march=i386;
# that way we can complain to the user if the CPU is insufficient.
#
# The -m16 option is supported by GCC >= 4.9 and clang >= 3.5. For
# older versions of GCC, include an *assembly* header to make sure that
# gcc doesn't play any games behind our back.
CODE16GCC_CFLAGS := -m32 -Wa,$(srctree)/arch/x86/boot/code16gcc.h
M16_CFLAGS	 := $(call cc-option, -m16, $(CODE16GCC_CFLAGS))

REALMODE_CFLAGS	:= $(M16_CFLAGS) -g -Os -DDISABLE_BRANCH_PROFILING \
		   -Wall -Wstrict-prototypes -march=i386 -mregparm=3 \
		   -fno-strict-aliasing -fomit-frame-pointer -fno-pic \
		   -mno-mmx -mno-sse

REALMODE_CFLAGS += -ffreestanding
REALMODE_CFLAGS += -fno-stack-protector
REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -Wno-address-of-packed-member)
REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), $(cc_stack_align4))
export REALMODE_CFLAGS

# BITS is used as extension for files which are available in a 32 bit
# and a 64 bit version to simplify shared Makefiles.
# e.g.: obj-y += foo_$(BITS).o
export BITS

#
# Prevent GCC from generating any FP code by mistake.
#
# This must happen before we try the -mpreferred-stack-boundary, see:
#
#    https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383
#
KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow
KBUILD_CFLAGS += $(call cc-option,-mno-avx,)

ifeq ($(CONFIG_X86_32),y)
        BITS := 32
        UTS_MACHINE := i386
        CHECKFLAGS += -D__i386__

        biarch := $(call cc-option,-m32)
        KBUILD_AFLAGS += $(biarch)
        KBUILD_CFLAGS += $(biarch)

        KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return

        # Never want PIC in a 32-bit kernel, prevent breakage with GCC built
        # with nonstandard options
        KBUILD_CFLAGS += -fno-pic

        # Align the stack to the register width instead of using the default
        # alignment of 16 bytes. This reduces stack usage and the number of
        # alignment instructions.
        KBUILD_CFLAGS += $(call cc-option,$(cc_stack_align4))

        # CPU-specific tuning. Anything which can be shared with UML should go here.
        include arch/x86/Makefile_32.cpu
        KBUILD_CFLAGS += $(cflags-y)

        # temporary until string.h is fixed
        KBUILD_CFLAGS += -ffreestanding
else
        BITS := 64
        UTS_MACHINE := x86_64
        CHECKFLAGS += -D__x86_64__

        biarch := -m64
        KBUILD_AFLAGS += -m64
        KBUILD_CFLAGS += -m64

        # Align jump targets to 1 byte, not the default 16 bytes:
        KBUILD_CFLAGS += $(call cc-option,-falign-jumps=1)

        # Pack loops tightly as well:
        KBUILD_CFLAGS += $(call cc-option,-falign-loops=1)

        # Don't autogenerate traditional x87 instructions
        KBUILD_CFLAGS += $(call cc-option,-mno-80387)
        KBUILD_CFLAGS += $(call cc-option,-mno-fp-ret-in-387)

        # By default gcc and clang use a stack alignment of 16 bytes for x86.
        # However the standard kernel entry on x86-64 leaves the stack on an
        # 8-byte boundary. If the compiler isn't informed about the actual
        # alignment it will generate extra alignment instructions for the
        # default alignment which keep the stack *mis*aligned.
        # Furthermore an alignment to the register width reduces stack usage
        # and the number of alignment instructions.
        KBUILD_CFLAGS += $(call cc-option,$(cc_stack_align8))

	# Use -mskip-rax-setup if supported.
	KBUILD_CFLAGS += $(call cc-option,-mskip-rax-setup)

        # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
        cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
        cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)

        cflags-$(CONFIG_MCORE2) += \
                $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
	cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
		$(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
        cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
        KBUILD_CFLAGS += $(cflags-y)

        KBUILD_CFLAGS += -mno-red-zone
        KBUILD_CFLAGS += -mcmodel=kernel
endif

ifdef CONFIG_X86_X32
	x32_ld_ok := $(call try-run,\
			/bin/echo -e '1: .quad 1b' | \
			$(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \
			$(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
			$(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
        ifeq ($(x32_ld_ok),y)
                CONFIG_X86_X32_ABI := y
                KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
                KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
        else
                $(warning CONFIG_X86_X32 enabled but no binutils support)
        endif
endif
export CONFIG_X86_X32_ABI

#
# If the function graph tracer is used with mcount instead of fentry,
# '-maccumulate-outgoing-args' is needed to prevent a GCC bug
# (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42109)
#
ifdef CONFIG_FUNCTION_GRAPH_TRACER
  ifndef CONFIG_HAVE_FENTRY
	ACCUMULATE_OUTGOING_ARGS := 1
  else
    ifeq ($(call cc-option-yn, -mfentry), n)
	ACCUMULATE_OUTGOING_ARGS := 1

	# GCC ignores '-maccumulate-outgoing-args' when used with '-Os'.
	# If '-Os' is enabled, disable it and print a warning.
        ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
          undefine CONFIG_CC_OPTIMIZE_FOR_SIZE
          $(warning Disabling CONFIG_CC_OPTIMIZE_FOR_SIZE.  Your compiler does not have -mfentry so you cannot optimize for size with CONFIG_FUNCTION_GRAPH_TRACER.)
        endif

    endif
  endif
endif

ifeq ($(ACCUMULATE_OUTGOING_ARGS), 1)
	# This compiler flag is not supported by Clang:
	KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args,)
endif

# Workaround for a gcc prelease that unfortunately was shipped in a suse release
KBUILD_CFLAGS += -Wno-sign-compare
#
KBUILD_CFLAGS += -fno-asynchronous-unwind-tables

# Avoid indirect branches in kernel to deal with Spectre
ifdef CONFIG_RETPOLINE
  KBUILD_CFLAGS += $(RETPOLINE_CFLAGS)
  # Additionally, avoid generating expensive indirect jumps which
  # are subject to retpolines for small number of switch cases.
  # clang turns off jump table generation by default when under
  # retpoline builds, however, gcc does not for x86. This has
  # only been fixed starting from gcc stable version 8.4.0 and
  # onwards, but not for older ones. See gcc bug #86952.
  ifndef CONFIG_CC_IS_CLANG
    KBUILD_CFLAGS += $(call cc-option,-fno-jump-tables)
  endif
endif

KBUILD_LDFLAGS := -m elf_$(UTS_MACHINE)

ifdef CONFIG_X86_NEED_RELOCS
LDFLAGS_vmlinux := --emit-relocs --discard-none
else
LDFLAGS_vmlinux :=
endif

#
# The 64-bit kernel must be aligned to 2MB.  Pass -z max-page-size=0x200000 to
# the linker to force 2MB page size regardless of the default page size used
# by the linker.
#
ifdef CONFIG_X86_64
LDFLAGS_vmlinux += -z max-page-size=0x200000
endif


archscripts: scripts_basic
	$(Q)$(MAKE) $(build)=arch/x86/tools relocs

###
# Syscall table generation

archheaders:
	$(Q)$(MAKE) $(build)=arch/x86/entry/syscalls all

###
# Kernel objects

head-y := arch/x86/kernel/head_$(BITS).o
head-y += arch/x86/kernel/head$(BITS).o
head-y += arch/x86/kernel/ebda.o
head-y += arch/x86/kernel/platform-quirks.o

libs-y  += arch/x86/lib/

# See arch/x86/Kbuild for content of core part of the kernel
core-y += arch/x86/

# drivers-y are linked after core-y
drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
drivers-$(CONFIG_PCI)            += arch/x86/pci/

# must be linked after kernel/
drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/

# suspend and hibernation support
drivers-$(CONFIG_PM) += arch/x86/power/

drivers-$(CONFIG_FB) += arch/x86/video/

####
# boot loader support. Several targets are kept for legacy purposes

boot := arch/x86/boot

BOOT_TARGETS = bzdisk fdimage fdimage144 fdimage288 isoimage

PHONY += bzImage $(BOOT_TARGETS)

# Default kernel to build
all: bzImage

# KBUILD_IMAGE specify target image being built
KBUILD_IMAGE := $(boot)/bzImage

bzImage: vmlinux
ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
	$(Q)$(MAKE) $(build)=arch/x86/tools posttest
endif
	$(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
	$(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
	$(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@

$(BOOT_TARGETS): vmlinux
	$(Q)$(MAKE) $(build)=$(boot) $@

PHONY += install bzlilo
install bzlilo:
	$(Q)$(MAKE) $(build)=$(boot) $@

PHONY += vdso_install
vdso_install:
	$(Q)$(MAKE) $(build)=arch/x86/entry/vdso $@

archprepare: checkbin
checkbin:
ifndef CONFIG_CC_HAS_ASM_GOTO
	@echo Compiler lacks asm-goto support.
	@exit 1
endif
ifdef CONFIG_RETPOLINE
ifeq ($(RETPOLINE_CFLAGS),)
	@echo "You are building kernel with non-retpoline compiler." >&2
	@echo "Please update your compiler." >&2
	@false
endif
endif

archclean:
	$(Q)rm -rf $(objtree)/arch/i386
	$(Q)rm -rf $(objtree)/arch/x86_64
	$(Q)$(MAKE) $(clean)=$(boot)
	$(Q)$(MAKE) $(clean)=arch/x86/tools

define archhelp
  echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
  echo  '  install      - Install kernel using'
  echo  '                  (your) ~/bin/$(INSTALLKERNEL) or'
  echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
  echo  '                  install to $$(INSTALL_PATH) and run lilo'
  echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
  echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
  echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
  echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
  echo  '                  bzdisk/fdimage*/isoimage also accept:'
  echo  '                  FDARGS="..."  arguments for the booted kernel'
  echo  '                  FDINITRD=file initrd for the booted kernel'
endef
Commit	Line	Data
	1	# SPDX-License-Identifier: GPL-2.0
	2	# Unified Makefile for i386 and x86_64
	3
	4	# select defconfig based on actual architecture
	5	ifeq ($(ARCH),x86)
	6	ifeq ($(shell uname -m),x86_64)
	7	KBUILD_DEFCONFIG := x86_64_defconfig
	8	else
	9	KBUILD_DEFCONFIG := i386_defconfig
	10	endif
	11	else
	12	KBUILD_DEFCONFIG := $(ARCH)_defconfig
	13	endif
	14
	15	# For gcc stack alignment is specified with -mpreferred-stack-boundary,
	16	# clang has the option -mstack-alignment for that purpose.
	17	ifneq ($(call cc-option, -mpreferred-stack-boundary=4),)
	18	cc_stack_align4 := -mpreferred-stack-boundary=2
	19	cc_stack_align8 := -mpreferred-stack-boundary=3
	20	else ifneq ($(call cc-option, -mstack-alignment=16),)
	21	cc_stack_align4 := -mstack-alignment=4
	22	cc_stack_align8 := -mstack-alignment=8
	23	endif
	24
	25	# How to compile the 16-bit code. Note we always compile for -march=i386;
	26	# that way we can complain to the user if the CPU is insufficient.
	27	#
	28	# The -m16 option is supported by GCC >= 4.9 and clang >= 3.5. For
	29	# older versions of GCC, include an assembly header to make sure that
	30	# gcc doesn't play any games behind our back.
	31	CODE16GCC_CFLAGS := -m32 -Wa,$(srctree)/arch/x86/boot/code16gcc.h
	32	M16_CFLAGS := $(call cc-option, -m16, $(CODE16GCC_CFLAGS))
	33
	34	REALMODE_CFLAGS := $(M16_CFLAGS) -g -Os -DDISABLE_BRANCH_PROFILING \
	35	-Wall -Wstrict-prototypes -march=i386 -mregparm=3 \
	36	-fno-strict-aliasing -fomit-frame-pointer -fno-pic \
	37	-mno-mmx -mno-sse
	38
	39	REALMODE_CFLAGS += -ffreestanding
	40	REALMODE_CFLAGS += -fno-stack-protector
	41	REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -Wno-address-of-packed-member)
	42	REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), $(cc_stack_align4))
	43	export REALMODE_CFLAGS
	44
	45	# BITS is used as extension for files which are available in a 32 bit
	46	# and a 64 bit version to simplify shared Makefiles.
	47	# e.g.: obj-y += foo_$(BITS).o
	48	export BITS
	49
	50	#
	51	# Prevent GCC from generating any FP code by mistake.
	52	#
	53	# This must happen before we try the -mpreferred-stack-boundary, see:
	54	#
	55	# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383
	56	#
	57	KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow
	58	KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
	59
	60	ifeq ($(CONFIG_X86_32),y)
	61	BITS := 32
	62	UTS_MACHINE := i386
	63	CHECKFLAGS += -D__i386__
	64
	65	biarch := $(call cc-option,-m32)
	66	KBUILD_AFLAGS += $(biarch)
	67	KBUILD_CFLAGS += $(biarch)
	68
	69	KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
	70
	71	# Never want PIC in a 32-bit kernel, prevent breakage with GCC built
	72	# with nonstandard options
	73	KBUILD_CFLAGS += -fno-pic
	74
	75	# Align the stack to the register width instead of using the default
	76	# alignment of 16 bytes. This reduces stack usage and the number of
	77	# alignment instructions.
	78	KBUILD_CFLAGS += $(call cc-option,$(cc_stack_align4))
	79
	80	# CPU-specific tuning. Anything which can be shared with UML should go here.
	81	include arch/x86/Makefile_32.cpu
	82	KBUILD_CFLAGS += $(cflags-y)
	83
	84	# temporary until string.h is fixed
	85	KBUILD_CFLAGS += -ffreestanding
	86	else
	87	BITS := 64
	88	UTS_MACHINE := x86_64
	89	CHECKFLAGS += -D__x86_64__
	90
	91	biarch := -m64
	92	KBUILD_AFLAGS += -m64
	93	KBUILD_CFLAGS += -m64
	94
	95	# Align jump targets to 1 byte, not the default 16 bytes:
	96	KBUILD_CFLAGS += $(call cc-option,-falign-jumps=1)
	97
	98	# Pack loops tightly as well:
	99	KBUILD_CFLAGS += $(call cc-option,-falign-loops=1)
	100
	101	# Don't autogenerate traditional x87 instructions
	102	KBUILD_CFLAGS += $(call cc-option,-mno-80387)
	103	KBUILD_CFLAGS += $(call cc-option,-mno-fp-ret-in-387)
	104
	105	# By default gcc and clang use a stack alignment of 16 bytes for x86.
	106	# However the standard kernel entry on x86-64 leaves the stack on an
	107	# 8-byte boundary. If the compiler isn't informed about the actual
	108	# alignment it will generate extra alignment instructions for the
	109	# default alignment which keep the stack misaligned.
	110	# Furthermore an alignment to the register width reduces stack usage
	111	# and the number of alignment instructions.
	112	KBUILD_CFLAGS += $(call cc-option,$(cc_stack_align8))
	113
	114	# Use -mskip-rax-setup if supported.
	115	KBUILD_CFLAGS += $(call cc-option,-mskip-rax-setup)
	116
	117	# FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
	118	cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
	119	cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
	120
	121	cflags-$(CONFIG_MCORE2) += \
	122	$(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
	123	cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
	124	$(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
	125	cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
	126	KBUILD_CFLAGS += $(cflags-y)
	127
	128	KBUILD_CFLAGS += -mno-red-zone
	129	KBUILD_CFLAGS += -mcmodel=kernel
	130	endif
	131
	132	ifdef CONFIG_X86_X32
	133	x32_ld_ok := $(call try-run,\
	134	/bin/echo -e '1: .quad 1b' \| \
	135	$(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \
	136	$(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
	137	$(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
	138	ifeq ($(x32_ld_ok),y)
	139	CONFIG_X86_X32_ABI := y
	140	KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
	141	KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
	142	else
	143	$(warning CONFIG_X86_X32 enabled but no binutils support)
	144	endif
	145	endif
	146	export CONFIG_X86_X32_ABI
	147
	148	#
	149	# If the function graph tracer is used with mcount instead of fentry,
	150	# '-maccumulate-outgoing-args' is needed to prevent a GCC bug
	151	# (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42109)
	152	#
	153	ifdef CONFIG_FUNCTION_GRAPH_TRACER
	154	ifndef CONFIG_HAVE_FENTRY
	155	ACCUMULATE_OUTGOING_ARGS := 1
	156	else
	157	ifeq ($(call cc-option-yn, -mfentry), n)
	158	ACCUMULATE_OUTGOING_ARGS := 1
	159
	160	# GCC ignores '-maccumulate-outgoing-args' when used with '-Os'.
	161	# If '-Os' is enabled, disable it and print a warning.
	162	ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
	163	undefine CONFIG_CC_OPTIMIZE_FOR_SIZE
	164	$(warning Disabling CONFIG_CC_OPTIMIZE_FOR_SIZE. Your compiler does not have -mfentry so you cannot optimize for size with CONFIG_FUNCTION_GRAPH_TRACER.)
	165	endif
	166
	167	endif
	168	endif
	169	endif
	170
	171	ifeq ($(ACCUMULATE_OUTGOING_ARGS), 1)
	172	# This compiler flag is not supported by Clang:
	173	KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args,)
	174	endif
	175
	176	# Workaround for a gcc prelease that unfortunately was shipped in a suse release
	177	KBUILD_CFLAGS += -Wno-sign-compare
	178	#
	179	KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
	180
	181	# Avoid indirect branches in kernel to deal with Spectre
	182	ifdef CONFIG_RETPOLINE
	183	KBUILD_CFLAGS += $(RETPOLINE_CFLAGS)
	184	# Additionally, avoid generating expensive indirect jumps which
	185	# are subject to retpolines for small number of switch cases.
	186	# clang turns off jump table generation by default when under
	187	# retpoline builds, however, gcc does not for x86. This has
	188	# only been fixed starting from gcc stable version 8.4.0 and
	189	# onwards, but not for older ones. See gcc bug #86952.
	190	ifndef CONFIG_CC_IS_CLANG
	191	KBUILD_CFLAGS += $(call cc-option,-fno-jump-tables)
	192	endif
	193	endif
	194
	195	KBUILD_LDFLAGS := -m elf_$(UTS_MACHINE)
	196
	197	ifdef CONFIG_X86_NEED_RELOCS
	198	LDFLAGS_vmlinux := --emit-relocs --discard-none
	199	else
	200	LDFLAGS_vmlinux :=
	201	endif
	202
	203	#
	204	# The 64-bit kernel must be aligned to 2MB. Pass -z max-page-size=0x200000 to
	205	# the linker to force 2MB page size regardless of the default page size used
	206	# by the linker.
	207	#
	208	ifdef CONFIG_X86_64
	209	LDFLAGS_vmlinux += -z max-page-size=0x200000
	210	endif
	211
	212
	213	archscripts: scripts_basic
	214	$(Q)$(MAKE) $(build)=arch/x86/tools relocs
	215
	216	###
	217	# Syscall table generation
	218
	219	archheaders:
	220	$(Q)$(MAKE) $(build)=arch/x86/entry/syscalls all
	221
	222	###
	223	# Kernel objects
	224
	225	head-y := arch/x86/kernel/head_$(BITS).o
	226	head-y += arch/x86/kernel/head$(BITS).o
	227	head-y += arch/x86/kernel/ebda.o
	228	head-y += arch/x86/kernel/platform-quirks.o
	229
	230	libs-y += arch/x86/lib/
	231
	232	# See arch/x86/Kbuild for content of core part of the kernel
	233	core-y += arch/x86/
	234
	235	# drivers-y are linked after core-y
	236	drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
	237	drivers-$(CONFIG_PCI) += arch/x86/pci/
	238
	239	# must be linked after kernel/
	240	drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
	241
	242	# suspend and hibernation support
	243	drivers-$(CONFIG_PM) += arch/x86/power/
	244
	245	drivers-$(CONFIG_FB) += arch/x86/video/
	246
	247	####
	248	# boot loader support. Several targets are kept for legacy purposes
	249
	250	boot := arch/x86/boot
	251
	252	BOOT_TARGETS = bzdisk fdimage fdimage144 fdimage288 isoimage
	253
	254	PHONY += bzImage $(BOOT_TARGETS)
	255
	256	# Default kernel to build
	257	all: bzImage
	258
	259	# KBUILD_IMAGE specify target image being built
	260	KBUILD_IMAGE := $(boot)/bzImage
	261
	262	bzImage: vmlinux
	263	ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
	264	$(Q)$(MAKE) $(build)=arch/x86/tools posttest
	265	endif
	266	$(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
	267	$(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
	268	$(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
	269
	270	$(BOOT_TARGETS): vmlinux
	271	$(Q)$(MAKE) $(build)=$(boot) $@
	272
	273	PHONY += install bzlilo
	274	install bzlilo:
	275	$(Q)$(MAKE) $(build)=$(boot) $@
	276
	277	PHONY += vdso_install
	278	vdso_install:
	279	$(Q)$(MAKE) $(build)=arch/x86/entry/vdso $@
	280
	281	archprepare: checkbin
	282	checkbin:
	283	ifndef CONFIG_CC_HAS_ASM_GOTO
	284	@echo Compiler lacks asm-goto support.
	285	@exit 1
	286	endif
	287	ifdef CONFIG_RETPOLINE
	288	ifeq ($(RETPOLINE_CFLAGS),)
	289	@echo "You are building kernel with non-retpoline compiler." >&2
	290	@echo "Please update your compiler." >&2
	291	@false
	292	endif
	293	endif
	294
	295	archclean:
	296	$(Q)rm -rf $(objtree)/arch/i386
	297	$(Q)rm -rf $(objtree)/arch/x86_64
	298	$(Q)$(MAKE) $(clean)=$(boot)
	299	$(Q)$(MAKE) $(clean)=arch/x86/tools
	300
	301	define archhelp
	302	echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)'
	303	echo ' install - Install kernel using'
	304	echo ' (your) ~/bin/$(INSTALLKERNEL) or'
	305	echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
	306	echo ' install to $$(INSTALL_PATH) and run lilo'
	307	echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
	308	echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
	309	echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
	310	echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
	311	echo ' bzdisk/fdimage*/isoimage also accept:'
	312	echo ' FDARGS="..." arguments for the booted kernel'
	313	echo ' FDINITRD=file initrd for the booted kernel'
	314	endef