1# Unified Makefile for i386 and x86_64 2 3# select defconfig based on actual architecture 4ifeq ($(ARCH),x86) 5 KBUILD_DEFCONFIG := i386_defconfig 6else 7 KBUILD_DEFCONFIG := $(ARCH)_defconfig 8endif 9 10# BITS is used as extension for files which are available in a 32 bit 11# and a 64 bit version to simplify shared Makefiles. 12# e.g.: obj-y += foo_$(BITS).o 13export BITS 14 15ifeq ($(CONFIG_X86_32),y) 16 BITS := 32 17 UTS_MACHINE := i386 18 CHECKFLAGS += -D__i386__ 19 20 biarch := $(call cc-option,-m32) 21 KBUILD_AFLAGS += $(biarch) 22 KBUILD_CFLAGS += $(biarch) 23 24 ifdef CONFIG_RELOCATABLE 25 LDFLAGS_vmlinux := --emit-relocs 26 endif 27 28 KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return 29 30 # prevent gcc from keeping the stack 16 byte aligned 31 KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2) 32 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)) 37 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 += $(cflags-y) 41 42 # temporary until string.h is fixed 43 KBUILD_CFLAGS += -ffreestanding 44else 45 BITS := 64 46 UTS_MACHINE := x86_64 47 CHECKFLAGS += -D__x86_64__ -m64 48 49 KBUILD_AFLAGS += -m64 50 KBUILD_CFLAGS += -m64 51 52 cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8) 53 cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona) 54 55 cflags-$(CONFIG_MCORE2) += \ 56 $(call cc-option,-march=core2,$(call cc-option,-mtune=generic)) 57 cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \ 58 $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic)) 59 cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic) 60 KBUILD_CFLAGS += $(cflags-y) 61 62 KBUILD_CFLAGS += -mno-red-zone 63 KBUILD_CFLAGS += -mcmodel=kernel 64 65 # -funit-at-a-time shrinks the kernel .text considerably 66 # unfortunately it makes reading oopses harder. 67 KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time) 68 69 # this works around some issues with generating unwind tables in older gccs 70 # newer gccs do it by default 71 KBUILD_CFLAGS += -maccumulate-outgoing-args 72endif 73 74ifdef CONFIG_CC_STACKPROTECTOR 75 cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh 76 ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y) 77 stackp-y := -fstack-protector 78 KBUILD_CFLAGS += $(stackp-y) 79 else 80 $(warning stack protector enabled but no compiler support) 81 endif 82endif 83 84# Don't unroll struct assignments with kmemcheck enabled 85ifeq ($(CONFIG_KMEMCHECK),y) 86 KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy) 87endif 88 89# Stackpointer is addressed different for 32 bit and 64 bit x86 90sp-$(CONFIG_X86_32) := esp 91sp-$(CONFIG_X86_64) := rsp 92 93# do binutils support CFI? 94cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1) 95# is .cfi_signal_frame supported too? 96cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1) 97cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1) 98KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) 99KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) 100 101LDFLAGS := -m elf_$(UTS_MACHINE) 102 103# Speed up the build 104KBUILD_CFLAGS += -pipe 105KBUILD_CFLAGS += -Wno-sign-compare 106# 107KBUILD_CFLAGS += -fno-asynchronous-unwind-tables 108# prevent gcc from generating any FP code by mistake 109KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,) 110 111KBUILD_CFLAGS += $(mflags-y) 112KBUILD_AFLAGS += $(mflags-y) 113 114### 115# Kernel objects 116 117head-y := arch/x86/kernel/head_$(BITS).o 118head-y += arch/x86/kernel/head$(BITS).o 119head-y += arch/x86/kernel/head.o 120head-y += arch/x86/kernel/init_task.o 121 122libs-y += arch/x86/lib/ 123 124# See arch/x86/Kbuild for content of core part of the kernel 125core-y += arch/x86/ 126 127# drivers-y are linked after core-y 128drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/ 129drivers-$(CONFIG_PCI) += arch/x86/pci/ 130 131# must be linked after kernel/ 132drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/ 133 134# suspend and hibernation support 135drivers-$(CONFIG_PM) += arch/x86/power/ 136 137drivers-$(CONFIG_FB) += arch/x86/video/ 138 139#### 140# boot loader support. Several targets are kept for legacy purposes 141 142boot := arch/x86/boot 143 144BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage 145 146PHONY += bzImage $(BOOT_TARGETS) 147 148# Default kernel to build 149all: bzImage 150 151# KBUILD_IMAGE specify target image being built 152KBUILD_IMAGE := $(boot)/bzImage 153 154bzImage: vmlinux 155ifeq ($(CONFIG_X86_DECODER_SELFTEST),y) 156 $(Q)$(MAKE) $(build)=arch/x86/tools posttest 157endif 158 $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE) 159 $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot 160 $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@ 161 162$(BOOT_TARGETS): vmlinux 163 $(Q)$(MAKE) $(build)=$(boot) $@ 164 165PHONY += install 166install: 167 $(Q)$(MAKE) $(build)=$(boot) $@ 168 169PHONY += vdso_install 170vdso_install: 171 $(Q)$(MAKE) $(build)=arch/x86/vdso $@ 172 173archclean: 174 $(Q)rm -rf $(objtree)/arch/i386 175 $(Q)rm -rf $(objtree)/arch/x86_64 176 $(Q)$(MAKE) $(clean)=$(boot) 177 178define archhelp 179 echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)' 180 echo ' install - Install kernel using' 181 echo ' (your) ~/bin/$(INSTALLKERNEL) or' 182 echo ' (distribution) /sbin/$(INSTALLKERNEL) or' 183 echo ' install to $$(INSTALL_PATH) and run lilo' 184 echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' 185 echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' 186 echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)' 187 echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)' 188 echo ' bzdisk/fdimage*/isoimage also accept:' 189 echo ' FDARGS="..." arguments for the booted kernel' 190 echo ' FDINITRD=file initrd for the booted kernel' 191endef 192