1 # Unified Makefile for i386 and x86_64
3 # select defconfig based on actual architecture
5 KBUILD_DEFCONFIG := i386_defconfig
7 KBUILD_DEFCONFIG := $(ARCH)_defconfig
10 # BITS is used as extension for files which are available in a 32 bit
11 # and a 64 bit version to simplify shared Makefiles.
12 # e.g.: obj-y += foo_$(BITS).o
15 ifeq ($(CONFIG_X86_32),y)
18 CHECKFLAGS += -D__i386__
20 biarch := $(call cc-option,-m32)
21 KBUILD_AFLAGS += $(biarch)
22 KBUILD_CFLAGS += $(biarch)
24 ifdef CONFIG_RELOCATABLE
25 LDFLAGS_vmlinux := --emit-relocs
28 KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
30 # prevent gcc from keeping the stack 16 byte aligned
31 KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
33 # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
34 # a lot more stack due to the lack of sharing of stacklots:
35 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \
36 $(call cc-option,-fno-unit-at-a-time))
38 # CPU-specific tuning. Anything which can be shared with UML should go here.
39 include $(srctree)/arch/x86/Makefile_32.cpu
40 KBUILD_CFLAGS += $(cflags-y)
42 # temporary until string.h is fixed
43 KBUILD_CFLAGS += -ffreestanding
47 CHECKFLAGS += -D__x86_64__ -m64
52 # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
53 cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
54 cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
56 cflags-$(CONFIG_MCORE2) += \
57 $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
58 cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
59 $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
60 cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
61 KBUILD_CFLAGS += $(cflags-y)
63 KBUILD_CFLAGS += -mno-red-zone
64 KBUILD_CFLAGS += -mcmodel=kernel
66 # -funit-at-a-time shrinks the kernel .text considerably
67 # unfortunately it makes reading oopses harder.
68 KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
70 # this works around some issues with generating unwind tables in older gccs
71 # newer gccs do it by default
72 KBUILD_CFLAGS += -maccumulate-outgoing-args
75 ifdef CONFIG_CC_STACKPROTECTOR
76 cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
77 ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
78 stackp-y := -fstack-protector
79 KBUILD_CFLAGS += $(stackp-y)
81 $(warning stack protector enabled but no compiler support)
85 # Don't unroll struct assignments with kmemcheck enabled
86 ifeq ($(CONFIG_KMEMCHECK),y)
87 KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
90 # Stackpointer is addressed different for 32 bit and 64 bit x86
91 sp-$(CONFIG_X86_32) := esp
92 sp-$(CONFIG_X86_64) := rsp
94 # do binutils support CFI?
95 cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
96 # is .cfi_signal_frame supported too?
97 cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
98 cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
100 # does binutils support specific instructions?
101 asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
103 KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr)
104 KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr)
106 LDFLAGS := -m elf_$(UTS_MACHINE)
109 KBUILD_CFLAGS += -pipe
110 # Workaround for a gcc prelease that unfortunately was shipped in a suse release
111 KBUILD_CFLAGS += -Wno-sign-compare
113 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
114 # prevent gcc from generating any FP code by mistake
115 KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
117 KBUILD_CFLAGS += $(mflags-y)
118 KBUILD_AFLAGS += $(mflags-y)
123 head-y := arch/x86/kernel/head_$(BITS).o
124 head-y += arch/x86/kernel/head$(BITS).o
125 head-y += arch/x86/kernel/head.o
126 head-y += arch/x86/kernel/init_task.o
128 libs-y += arch/x86/lib/
130 # See arch/x86/Kbuild for content of core part of the kernel
133 # drivers-y are linked after core-y
134 drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
135 drivers-$(CONFIG_PCI) += arch/x86/pci/
137 # must be linked after kernel/
138 drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
140 # suspend and hibernation support
141 drivers-$(CONFIG_PM) += arch/x86/power/
143 drivers-$(CONFIG_FB) += arch/x86/video/
146 # boot loader support. Several targets are kept for legacy purposes
148 boot := arch/x86/boot
150 BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
152 PHONY += bzImage $(BOOT_TARGETS)
154 # Default kernel to build
157 # KBUILD_IMAGE specify target image being built
158 KBUILD_IMAGE := $(boot)/bzImage
161 ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
162 $(Q)$(MAKE) $(build)=arch/x86/tools posttest
164 $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
165 $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
166 $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
168 $(BOOT_TARGETS): vmlinux
169 $(Q)$(MAKE) $(build)=$(boot) $@
173 $(Q)$(MAKE) $(build)=$(boot) $@
175 PHONY += vdso_install
177 $(Q)$(MAKE) $(build)=arch/x86/vdso $@
180 $(Q)rm -rf $(objtree)/arch/i386
181 $(Q)rm -rf $(objtree)/arch/x86_64
182 $(Q)$(MAKE) $(clean)=$(boot)
185 echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)'
186 echo ' install - Install kernel using'
187 echo ' (your) ~/bin/$(INSTALLKERNEL) or'
188 echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
189 echo ' install to $$(INSTALL_PATH) and run lilo'
190 echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
191 echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
192 echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
193 echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
194 echo ' bzdisk/fdimage*/isoimage also accept:'
195 echo ' FDARGS="..." arguments for the booted kernel'
196 echo ' FDINITRD=file initrd for the booted kernel'